Commit | Line | Data |
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3aa6856a | 1 | /* Target-struct-independent code to start (run) and stop an inferior process. |
02331869 AC |
2 | Copyright 1986, 87, 88, 89, 91, 92, 93, 94, 95, 96, 97, 1998 |
3 | Free Software Foundation, Inc. | |
bd5635a1 RP |
4 | |
5 | This file is part of GDB. | |
6 | ||
3b271cf4 | 7 | This program is free software; you can redistribute it and/or modify |
bd5635a1 | 8 | it under the terms of the GNU General Public License as published by |
3b271cf4 JG |
9 | the Free Software Foundation; either version 2 of the License, or |
10 | (at your option) any later version. | |
bd5635a1 | 11 | |
3b271cf4 | 12 | This program is distributed in the hope that it will be useful, |
bd5635a1 RP |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
3b271cf4 | 18 | along with this program; if not, write to the Free Software |
3f687c78 | 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
bd5635a1 | 20 | |
bd5635a1 | 21 | #include "defs.h" |
2b576293 | 22 | #include "gdb_string.h" |
a6b98cb9 | 23 | #include <ctype.h> |
bd5635a1 RP |
24 | #include "symtab.h" |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "breakpoint.h" | |
28 | #include "wait.h" | |
29 | #include "gdbcore.h" | |
3950a34e | 30 | #include "gdbcmd.h" |
bd5635a1 | 31 | #include "target.h" |
fdfa3315 | 32 | #include "gdbthread.h" |
1c95d7ab | 33 | #include "annotate.h" |
24a38525 | 34 | #include "symfile.h" /* for overlay functions */ |
bd5635a1 RP |
35 | |
36 | #include <signal.h> | |
37 | ||
30875e1c | 38 | /* Prototypes for local functions */ |
bd5635a1 | 39 | |
4cc1b3f7 | 40 | static void signals_info PARAMS ((char *, int)); |
619fd145 | 41 | |
4cc1b3f7 | 42 | static void handle_command PARAMS ((char *, int)); |
30875e1c | 43 | |
67ac9759 | 44 | static void sig_print_info PARAMS ((enum target_signal)); |
30875e1c | 45 | |
4cc1b3f7 | 46 | static void sig_print_header PARAMS ((void)); |
30875e1c | 47 | |
4cc1b3f7 | 48 | static void resume_cleanups PARAMS ((int)); |
30875e1c | 49 | |
fbd641cb | 50 | static int hook_stop_stub PARAMS ((PTR)); |
3950a34e | 51 | |
b607efe7 FF |
52 | static void delete_breakpoint_current_contents PARAMS ((PTR)); |
53 | ||
65b07ddc DT |
54 | int inferior_ignoring_startup_exec_events = 0; |
55 | int inferior_ignoring_leading_exec_events = 0; | |
56 | ||
57 | #ifdef HPUXHPPA | |
58 | /* wait_for_inferior and normal_stop use this to notify the user | |
59 | when the inferior stopped in a different thread than it had been | |
60 | running in. */ | |
61 | static int switched_from_inferior_pid; | |
62 | #endif | |
63 | ||
64 | /* resume and wait_for_inferior use this to ensure that when | |
65 | stepping over a hit breakpoint in a threaded application | |
66 | only the thread that hit the breakpoint is stepped and the | |
67 | other threads don't continue. This prevents having another | |
68 | thread run past the breakpoint while it is temporarily | |
69 | removed. | |
70 | ||
71 | This is not thread-specific, so it isn't saved as part of | |
72 | the infrun state. | |
73 | ||
74 | Versions of gdb which don't use the "step == this thread steps | |
75 | and others continue" model but instead use the "step == this | |
76 | thread steps and others wait" shouldn't do this. */ | |
77 | static int thread_step_needed = 0; | |
78 | ||
02331869 AC |
79 | void _initialize_infrun PARAMS ((void)); |
80 | ||
30875e1c SG |
81 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
82 | program. It needs to examine the jmp_buf argument and extract the PC | |
83 | from it. The return value is non-zero on success, zero otherwise. */ | |
4cc1b3f7 | 84 | |
30875e1c SG |
85 | #ifndef GET_LONGJMP_TARGET |
86 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 | |
87 | #endif | |
88 | ||
d747e0af MT |
89 | |
90 | /* Some machines have trampoline code that sits between function callers | |
91 | and the actual functions themselves. If this machine doesn't have | |
92 | such things, disable their processing. */ | |
4cc1b3f7 | 93 | |
d747e0af MT |
94 | #ifndef SKIP_TRAMPOLINE_CODE |
95 | #define SKIP_TRAMPOLINE_CODE(pc) 0 | |
96 | #endif | |
97 | ||
87273c71 JL |
98 | /* Dynamic function trampolines are similar to solib trampolines in that they |
99 | are between the caller and the callee. The difference is that when you | |
100 | enter a dynamic trampoline, you can't determine the callee's address. Some | |
101 | (usually complex) code needs to run in the dynamic trampoline to figure out | |
102 | the callee's address. This macro is usually called twice. First, when we | |
103 | enter the trampoline (looks like a normal function call at that point). It | |
104 | should return the PC of a point within the trampoline where the callee's | |
105 | address is known. Second, when we hit the breakpoint, this routine returns | |
106 | the callee's address. At that point, things proceed as per a step resume | |
107 | breakpoint. */ | |
108 | ||
109 | #ifndef DYNAMIC_TRAMPOLINE_NEXTPC | |
110 | #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0 | |
111 | #endif | |
112 | ||
24a38525 DP |
113 | /* On SVR4 based systems, determining the callee's address is exceedingly |
114 | difficult and depends on the implementation of the run time loader. | |
115 | If we are stepping at the source level, we single step until we exit | |
116 | the run time loader code and reach the callee's address. */ | |
117 | ||
118 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
119 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
120 | #endif | |
121 | ||
1eeba686 | 122 | /* For SVR4 shared libraries, each call goes through a small piece of |
4cc1b3f7 | 123 | trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates |
1eeba686 | 124 | to nonzero if we are current stopped in one of these. */ |
4cc1b3f7 JK |
125 | |
126 | #ifndef IN_SOLIB_CALL_TRAMPOLINE | |
127 | #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0 | |
128 | #endif | |
129 | ||
130 | /* In some shared library schemes, the return path from a shared library | |
131 | call may need to go through a trampoline too. */ | |
132 | ||
133 | #ifndef IN_SOLIB_RETURN_TRAMPOLINE | |
134 | #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0 | |
1eeba686 | 135 | #endif |
d747e0af | 136 | |
4eb4b87e MA |
137 | /* On MIPS16, a function that returns a floating point value may call |
138 | a library helper function to copy the return value to a floating point | |
139 | register. The IGNORE_HELPER_CALL macro returns non-zero if we | |
140 | should ignore (i.e. step over) this function call. */ | |
141 | #ifndef IGNORE_HELPER_CALL | |
142 | #define IGNORE_HELPER_CALL(pc) 0 | |
143 | #endif | |
144 | ||
9f739abd SG |
145 | /* On some systems, the PC may be left pointing at an instruction that won't |
146 | actually be executed. This is usually indicated by a bit in the PSW. If | |
147 | we find ourselves in such a state, then we step the target beyond the | |
148 | nullified instruction before returning control to the user so as to avoid | |
149 | confusion. */ | |
150 | ||
151 | #ifndef INSTRUCTION_NULLIFIED | |
152 | #define INSTRUCTION_NULLIFIED 0 | |
153 | #endif | |
154 | ||
bd5635a1 RP |
155 | /* Tables of how to react to signals; the user sets them. */ |
156 | ||
072b552a JG |
157 | static unsigned char *signal_stop; |
158 | static unsigned char *signal_print; | |
159 | static unsigned char *signal_program; | |
160 | ||
161 | #define SET_SIGS(nsigs,sigs,flags) \ | |
162 | do { \ | |
163 | int signum = (nsigs); \ | |
164 | while (signum-- > 0) \ | |
165 | if ((sigs)[signum]) \ | |
166 | (flags)[signum] = 1; \ | |
167 | } while (0) | |
168 | ||
169 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
170 | do { \ | |
171 | int signum = (nsigs); \ | |
172 | while (signum-- > 0) \ | |
173 | if ((sigs)[signum]) \ | |
174 | (flags)[signum] = 0; \ | |
175 | } while (0) | |
bd5635a1 | 176 | |
3950a34e RP |
177 | |
178 | /* Command list pointer for the "stop" placeholder. */ | |
179 | ||
180 | static struct cmd_list_element *stop_command; | |
181 | ||
bd5635a1 | 182 | /* Nonzero if breakpoints are now inserted in the inferior. */ |
bd5635a1 | 183 | |
3950a34e | 184 | static int breakpoints_inserted; |
bd5635a1 RP |
185 | |
186 | /* Function inferior was in as of last step command. */ | |
187 | ||
188 | static struct symbol *step_start_function; | |
189 | ||
bd5635a1 RP |
190 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ |
191 | ||
192 | static int trap_expected; | |
193 | ||
b607efe7 | 194 | #ifdef SOLIB_ADD |
87273c71 JL |
195 | /* Nonzero if we want to give control to the user when we're notified |
196 | of shared library events by the dynamic linker. */ | |
197 | static int stop_on_solib_events; | |
b607efe7 | 198 | #endif |
87273c71 | 199 | |
c66ed884 | 200 | #ifdef HP_OS_BUG |
bd5635a1 RP |
201 | /* Nonzero if the next time we try to continue the inferior, it will |
202 | step one instruction and generate a spurious trace trap. | |
203 | This is used to compensate for a bug in HP-UX. */ | |
204 | ||
205 | static int trap_expected_after_continue; | |
c66ed884 | 206 | #endif |
bd5635a1 RP |
207 | |
208 | /* Nonzero means expecting a trace trap | |
209 | and should stop the inferior and return silently when it happens. */ | |
210 | ||
211 | int stop_after_trap; | |
212 | ||
213 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
214 | It is used after attach, due to attaching to a process; | |
215 | when running in the shell before the child program has been exec'd; | |
216 | and when running some kinds of remote stuff (FIXME?). */ | |
217 | ||
218 | int stop_soon_quietly; | |
219 | ||
bd5635a1 RP |
220 | /* Nonzero if proceed is being used for a "finish" command or a similar |
221 | situation when stop_registers should be saved. */ | |
222 | ||
223 | int proceed_to_finish; | |
224 | ||
225 | /* Save register contents here when about to pop a stack dummy frame, | |
226 | if-and-only-if proceed_to_finish is set. | |
227 | Thus this contains the return value from the called function (assuming | |
228 | values are returned in a register). */ | |
229 | ||
230 | char stop_registers[REGISTER_BYTES]; | |
231 | ||
232 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
233 | ||
234 | static int breakpoints_failed; | |
235 | ||
236 | /* Nonzero after stop if current stack frame should be printed. */ | |
237 | ||
238 | static int stop_print_frame; | |
239 | ||
65b07ddc DT |
240 | static struct breakpoint *step_resume_breakpoint = NULL; |
241 | static struct breakpoint *through_sigtramp_breakpoint = NULL; | |
242 | ||
243 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
244 | interactions with an inferior that is running a kernel function | |
245 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
246 | may have a need to know when the inferior is in a syscall. This | |
247 | is a count of the number of inferior threads which are known to | |
248 | currently be running in a syscall. */ | |
249 | static int number_of_threads_in_syscalls; | |
250 | ||
251 | /* This is used to remember when a fork, vfork or exec event | |
252 | was caught by a catchpoint, and thus the event is to be | |
253 | followed at the next resume of the inferior, and not | |
254 | immediately. */ | |
255 | static struct { | |
256 | enum target_waitkind kind; | |
257 | struct { | |
258 | int parent_pid; | |
259 | int saw_parent_fork; | |
260 | int child_pid; | |
261 | int saw_child_fork; | |
262 | int saw_child_exec; | |
263 | } fork_event; | |
264 | char * execd_pathname; | |
265 | } pending_follow; | |
266 | ||
267 | /* Some platforms don't allow us to do anything meaningful with a | |
268 | vforked child until it has exec'd. Vforked processes on such | |
269 | platforms can only be followed after they've exec'd. | |
270 | ||
271 | When this is set to 0, a vfork can be immediately followed, | |
272 | and an exec can be followed merely as an exec. When this is | |
273 | set to 1, a vfork event has been seen, but cannot be followed | |
274 | until the exec is seen. | |
275 | ||
276 | (In the latter case, inferior_pid is still the parent of the | |
277 | vfork, and pending_follow.fork_event.child_pid is the child. The | |
278 | appropriate process is followed, according to the setting of | |
279 | follow-fork-mode.) */ | |
280 | static int follow_vfork_when_exec; | |
281 | ||
282 | static char * follow_fork_mode_kind_names [] = { | |
283 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 | |
284 | kernel problem. It's also not terribly useful without a GUI to | |
285 | help the user drive two debuggers. So for now, I'm disabling | |
286 | the "both" option. | |
287 | "parent", "child", "both", "ask" }; | |
288 | */ | |
289 | "parent", "child", "ask" }; | |
290 | ||
291 | static char * follow_fork_mode_string = NULL; | |
292 | ||
293 | \f | |
294 | #if defined(HPUXHPPA) | |
295 | static void | |
296 | follow_inferior_fork (parent_pid, child_pid, has_forked, has_vforked) | |
297 | int parent_pid; | |
298 | int child_pid; | |
299 | int has_forked; | |
300 | int has_vforked; | |
301 | { | |
302 | int followed_parent = 0; | |
303 | int followed_child = 0; | |
304 | int ima_clone = 0; | |
305 | ||
306 | /* Which process did the user want us to follow? */ | |
307 | char * follow_mode = | |
308 | savestring (follow_fork_mode_string, strlen (follow_fork_mode_string)); | |
309 | ||
310 | /* Or, did the user not know, and want us to ask? */ | |
311 | if (STREQ (follow_fork_mode_string, "ask")) | |
312 | { | |
313 | char requested_mode[100]; | |
314 | ||
315 | free (follow_mode); | |
316 | error ("\"ask\" mode NYI"); | |
317 | follow_mode = savestring (requested_mode, strlen (requested_mode)); | |
318 | } | |
319 | ||
320 | /* If we're to be following the parent, then detach from child_pid. | |
321 | We're already following the parent, so need do nothing explicit | |
322 | for it. */ | |
323 | if (STREQ (follow_mode, "parent")) | |
324 | { | |
325 | followed_parent = 1; | |
326 | ||
327 | /* We're already attached to the parent, by default. */ | |
328 | ||
329 | /* Before detaching from the child, remove all breakpoints from | |
330 | it. (This won't actually modify the breakpoint list, but will | |
331 | physically remove the breakpoints from the child.) */ | |
332 | if (! has_vforked || ! follow_vfork_when_exec) | |
333 | { | |
334 | detach_breakpoints (child_pid); | |
335 | SOLIB_REMOVE_INFERIOR_HOOK (child_pid); | |
336 | } | |
337 | ||
338 | /* Detach from the child. */ | |
339 | dont_repeat (); | |
340 | ||
341 | target_require_detach (child_pid, "", 1); | |
342 | } | |
343 | ||
344 | /* If we're to be following the child, then attach to it, detach | |
345 | from inferior_pid, and set inferior_pid to child_pid. */ | |
346 | else if (STREQ (follow_mode, "child")) | |
347 | { | |
348 | char child_pid_spelling [100]; /* Arbitrary length. */ | |
349 | ||
350 | followed_child = 1; | |
351 | ||
352 | /* Before detaching from the parent, detach all breakpoints from | |
353 | the child. But only if we're forking, or if we follow vforks | |
354 | as soon as they happen. (If we're following vforks only when | |
355 | the child has exec'd, then it's very wrong to try to write | |
356 | back the "shadow contents" of inserted breakpoints now -- they | |
357 | belong to the child's pre-exec'd a.out.) */ | |
358 | if (! has_vforked || ! follow_vfork_when_exec) | |
359 | { | |
360 | detach_breakpoints (child_pid); | |
361 | } | |
362 | ||
363 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
364 | remove_breakpoints (); | |
365 | ||
366 | /* Also reset the solib inferior hook from the parent. */ | |
367 | SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid); | |
368 | ||
369 | /* Detach from the parent. */ | |
370 | dont_repeat (); | |
371 | target_detach (NULL, 1); | |
372 | ||
373 | /* Attach to the child. */ | |
374 | inferior_pid = child_pid; | |
375 | sprintf (child_pid_spelling, "%d", child_pid); | |
376 | dont_repeat (); | |
377 | ||
378 | target_require_attach (child_pid_spelling, 1); | |
379 | ||
380 | /* Was there a step_resume breakpoint? (There was if the user | |
381 | did a "next" at the fork() call.) If so, explicitly reset its | |
382 | thread number. | |
383 | ||
384 | step_resumes are a form of bp that are made to be per-thread. | |
385 | Since we created the step_resume bp when the parent process | |
386 | was being debugged, and now are switching to the child process, | |
387 | from the breakpoint package's viewpoint, that's a switch of | |
388 | "threads". We must update the bp's notion of which thread | |
389 | it is for, or it'll be ignored when it triggers... */ | |
1f205f9d MS |
390 | if (step_resume_breakpoint && |
391 | (! has_vforked || ! follow_vfork_when_exec)) | |
65b07ddc DT |
392 | breakpoint_re_set_thread (step_resume_breakpoint); |
393 | ||
394 | /* Reinsert all breakpoints in the child. (The user may've set | |
395 | breakpoints after catching the fork, in which case those | |
396 | actually didn't get set in the child, but only in the parent.) */ | |
397 | if (! has_vforked || ! follow_vfork_when_exec) | |
398 | { | |
399 | breakpoint_re_set (); | |
400 | insert_breakpoints (); | |
401 | } | |
402 | } | |
403 | ||
404 | /* If we're to be following both parent and child, then fork ourselves, | |
405 | and attach the debugger clone to the child. */ | |
406 | else if (STREQ (follow_mode, "both")) | |
407 | { | |
408 | char pid_suffix [100]; /* Arbitrary length. */ | |
409 | ||
410 | /* Clone ourselves to follow the child. This is the end of our | |
411 | involvement with child_pid; our clone will take it from here... */ | |
412 | dont_repeat (); | |
413 | target_clone_and_follow_inferior (child_pid, &followed_child); | |
414 | followed_parent = !followed_child; | |
415 | ||
416 | /* We continue to follow the parent. To help distinguish the two | |
417 | debuggers, though, both we and our clone will reset our prompts. */ | |
418 | sprintf (pid_suffix, "[%d] ", inferior_pid); | |
419 | set_prompt (strcat (get_prompt (), pid_suffix)); | |
420 | } | |
421 | ||
422 | /* The parent and child of a vfork share the same address space. | |
423 | Also, on some targets the order in which vfork and exec events | |
424 | are received for parent in child requires some delicate handling | |
425 | of the events. | |
426 | ||
427 | For instance, on ptrace-based HPUX we receive the child's vfork | |
428 | event first, at which time the parent has been suspended by the | |
429 | OS and is essentially untouchable until the child's exit or second | |
430 | exec event arrives. At that time, the parent's vfork event is | |
431 | delivered to us, and that's when we see and decide how to follow | |
432 | the vfork. But to get to that point, we must continue the child | |
433 | until it execs or exits. To do that smoothly, all breakpoints | |
434 | must be removed from the child, in case there are any set between | |
435 | the vfork() and exec() calls. But removing them from the child | |
436 | also removes them from the parent, due to the shared-address-space | |
437 | nature of a vfork'd parent and child. On HPUX, therefore, we must | |
438 | take care to restore the bp's to the parent before we continue it. | |
439 | Else, it's likely that we may not stop in the expected place. (The | |
440 | worst scenario is when the user tries to step over a vfork() call; | |
441 | the step-resume bp must be restored for the step to properly stop | |
442 | in the parent after the call completes!) | |
443 | ||
444 | Sequence of events, as reported to gdb from HPUX: | |
445 | ||
446 | Parent Child Action for gdb to take | |
447 | ------------------------------------------------------- | |
448 | 1 VFORK Continue child | |
449 | 2 EXEC | |
450 | 3 EXEC or EXIT | |
451 | 4 VFORK */ | |
452 | if (has_vforked) | |
453 | { | |
454 | target_post_follow_vfork (parent_pid, | |
455 | followed_parent, | |
456 | child_pid, | |
457 | followed_child); | |
458 | } | |
459 | ||
460 | pending_follow.fork_event.saw_parent_fork = 0; | |
461 | pending_follow.fork_event.saw_child_fork = 0; | |
462 | ||
463 | free (follow_mode); | |
464 | } | |
465 | ||
466 | static void | |
467 | follow_fork (parent_pid, child_pid) | |
468 | int parent_pid; | |
469 | int child_pid; | |
470 | { | |
471 | follow_inferior_fork (parent_pid, child_pid, 1, 0); | |
472 | } | |
473 | ||
474 | ||
475 | /* Forward declaration. */ | |
476 | static void follow_exec PARAMS((int, char *)); | |
477 | ||
478 | static void | |
479 | follow_vfork (parent_pid, child_pid) | |
480 | int parent_pid; | |
481 | int child_pid; | |
482 | { | |
483 | follow_inferior_fork (parent_pid, child_pid, 0, 1); | |
484 | ||
485 | /* Did we follow the child? Had it exec'd before we saw the parent vfork? */ | |
486 | if (pending_follow.fork_event.saw_child_exec && (inferior_pid == child_pid)) | |
487 | { | |
488 | pending_follow.fork_event.saw_child_exec = 0; | |
489 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
490 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
491 | free (pending_follow.execd_pathname); | |
492 | } | |
493 | } | |
494 | #endif /* HPUXHPPA */ | |
495 | ||
496 | static void | |
497 | follow_exec (pid, execd_pathname) | |
498 | int pid; | |
499 | char * execd_pathname; | |
500 | { | |
501 | #ifdef HPUXHPPA | |
502 | int saved_pid = pid; | |
503 | extern struct target_ops child_ops; | |
504 | ||
505 | /* Did this exec() follow a vfork()? If so, we must follow the | |
506 | vfork now too. Do it before following the exec. */ | |
1f205f9d MS |
507 | if (follow_vfork_when_exec && |
508 | (pending_follow.kind == TARGET_WAITKIND_VFORKED)) | |
65b07ddc DT |
509 | { |
510 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
511 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
512 | follow_vfork_when_exec = 0; | |
513 | saved_pid = inferior_pid; | |
514 | ||
515 | /* Did we follow the parent? If so, we're done. If we followed | |
516 | the child then we must also follow its exec(). */ | |
517 | if (inferior_pid == pending_follow.fork_event.parent_pid) | |
518 | return; | |
519 | } | |
520 | ||
521 | /* This is an exec event that we actually wish to pay attention to. | |
522 | Refresh our symbol table to the newly exec'd program, remove any | |
523 | momentary bp's, etc. | |
524 | ||
525 | If there are breakpoints, they aren't really inserted now, | |
526 | since the exec() transformed our inferior into a fresh set | |
527 | of instructions. | |
528 | ||
529 | We want to preserve symbolic breakpoints on the list, since | |
530 | we have hopes that they can be reset after the new a.out's | |
531 | symbol table is read. | |
532 | ||
533 | However, any "raw" breakpoints must be removed from the list | |
534 | (e.g., the solib bp's), since their address is probably invalid | |
535 | now. | |
536 | ||
537 | And, we DON'T want to call delete_breakpoints() here, since | |
538 | that may write the bp's "shadow contents" (the instruction | |
539 | value that was overwritten witha TRAP instruction). Since | |
540 | we now have a new a.out, those shadow contents aren't valid. */ | |
541 | update_breakpoints_after_exec (); | |
542 | ||
543 | /* If there was one, it's gone now. We cannot truly step-to-next | |
544 | statement through an exec(). */ | |
545 | step_resume_breakpoint = NULL; | |
546 | step_range_start = 0; | |
547 | step_range_end = 0; | |
548 | ||
549 | /* If there was one, it's gone now. */ | |
550 | through_sigtramp_breakpoint = NULL; | |
551 | ||
552 | /* What is this a.out's name? */ | |
553 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
554 | ||
555 | /* We've followed the inferior through an exec. Therefore, the | |
556 | inferior has essentially been killed & reborn. */ | |
557 | gdb_flush (gdb_stdout); | |
558 | target_mourn_inferior (); | |
559 | inferior_pid = saved_pid; /* Because mourn_inferior resets inferior_pid. */ | |
560 | push_target (&child_ops); | |
561 | ||
562 | /* That a.out is now the one to use. */ | |
563 | exec_file_attach (execd_pathname, 0); | |
564 | ||
565 | /* And also is where symbols can be found. */ | |
566 | symbol_file_command (execd_pathname, 0); | |
567 | ||
568 | /* Reset the shared library package. This ensures that we get | |
569 | a shlib event when the child reaches "_start", at which point | |
570 | the dld will have had a chance to initialize the child. */ | |
571 | SOLIB_RESTART (); | |
572 | SOLIB_CREATE_INFERIOR_HOOK (inferior_pid); | |
573 | ||
574 | /* Reinsert all breakpoints. (Those which were symbolic have | |
575 | been reset to the proper address in the new a.out, thanks | |
576 | to symbol_file_command...) */ | |
577 | insert_breakpoints (); | |
578 | ||
579 | /* The next resume of this inferior should bring it to the shlib | |
580 | startup breakpoints. (If the user had also set bp's on | |
581 | "main" from the old (parent) process, then they'll auto- | |
582 | matically get reset there in the new process.) */ | |
583 | #endif | |
584 | } | |
585 | ||
02331869 AC |
586 | /* Non-zero if we just simulating a single-step. This is needed |
587 | because we cannot remove the breakpoints in the inferior process | |
588 | until after the `wait' in `wait_for_inferior'. */ | |
589 | static int singlestep_breakpoints_inserted_p = 0; | |
590 | ||
a71d17b1 JK |
591 | \f |
592 | /* Things to clean up if we QUIT out of resume (). */ | |
e1ce8aa5 | 593 | /* ARGSUSED */ |
a71d17b1 JK |
594 | static void |
595 | resume_cleanups (arg) | |
596 | int arg; | |
597 | { | |
598 | normal_stop (); | |
599 | } | |
600 | ||
3ab2abae MS |
601 | static char schedlock_off[] = "off"; |
602 | static char schedlock_on[] = "on"; | |
603 | static char schedlock_step[] = "step"; | |
604 | static char *scheduler_mode = schedlock_off; | |
605 | static char *scheduler_enums[] = {schedlock_off, schedlock_on, schedlock_step}; | |
606 | ||
607 | static void | |
608 | set_schedlock_func (args, from_tty, c) | |
609 | char *args; | |
610 | int from_tty; | |
611 | struct cmd_list_element *c; | |
612 | { | |
613 | if (c->type == set_cmd) | |
614 | if (!target_can_lock_scheduler) | |
615 | { | |
616 | scheduler_mode = schedlock_off; | |
617 | error ("Target '%s' cannot support this command.", | |
618 | target_shortname); | |
619 | } | |
620 | } | |
621 | ||
622 | ||
a71d17b1 JK |
623 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
624 | wants to interrupt some lengthy single-stepping operation | |
625 | (for child processes, the SIGINT goes to the inferior, and so | |
626 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
627 | other targets, that's not true). | |
628 | ||
629 | STEP nonzero if we should step (zero to continue instead). | |
630 | SIG is the signal to give the inferior (zero for none). */ | |
310cc570 | 631 | void |
a71d17b1 JK |
632 | resume (step, sig) |
633 | int step; | |
67ac9759 | 634 | enum target_signal sig; |
a71d17b1 | 635 | { |
65b07ddc | 636 | int should_resume = 1; |
02331869 AC |
637 | struct cleanup *old_cleanups = make_cleanup ((make_cleanup_func) |
638 | resume_cleanups, 0); | |
a71d17b1 | 639 | QUIT; |
d11c44f1 | 640 | |
cef4c2e7 PS |
641 | #ifdef CANNOT_STEP_BREAKPOINT |
642 | /* Most targets can step a breakpoint instruction, thus executing it | |
643 | normally. But if this one cannot, just continue and we will hit | |
644 | it anyway. */ | |
645 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
646 | step = 0; | |
647 | #endif | |
648 | ||
02331869 AC |
649 | if (SOFTWARE_SINGLE_STEP_P && step) |
650 | { | |
651 | /* Do it the hard way, w/temp breakpoints */ | |
652 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints*/); | |
653 | /* ...and don't ask hardware to do it. */ | |
654 | step = 0; | |
655 | /* and do not pull these breakpoints until after a `wait' in | |
656 | `wait_for_inferior' */ | |
657 | singlestep_breakpoints_inserted_p = 1; | |
658 | } | |
d11c44f1 | 659 | |
bdbd5f50 JG |
660 | /* Handle any optimized stores to the inferior NOW... */ |
661 | #ifdef DO_DEFERRED_STORES | |
662 | DO_DEFERRED_STORES; | |
663 | #endif | |
664 | ||
65b07ddc DT |
665 | #ifdef HPUXHPPA |
666 | /* If there were any forks/vforks/execs that were caught and are | |
667 | now to be followed, then do so. */ | |
668 | switch (pending_follow.kind) | |
669 | { | |
670 | case (TARGET_WAITKIND_FORKED): | |
671 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
672 | follow_fork (inferior_pid, pending_follow.fork_event.child_pid); | |
673 | break; | |
674 | ||
675 | case (TARGET_WAITKIND_VFORKED): | |
676 | { | |
677 | int saw_child_exec = pending_follow.fork_event.saw_child_exec; | |
678 | ||
679 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
680 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
681 | ||
682 | /* Did we follow the child, but not yet see the child's exec event? | |
683 | If so, then it actually ought to be waiting for us; we respond to | |
684 | parent vfork events. We don't actually want to resume the child | |
685 | in this situation; we want to just get its exec event. */ | |
1f205f9d MS |
686 | if (! saw_child_exec && |
687 | (inferior_pid == pending_follow.fork_event.child_pid)) | |
65b07ddc DT |
688 | should_resume = 0; |
689 | } | |
690 | break; | |
691 | ||
692 | case (TARGET_WAITKIND_EXECD): | |
693 | /* If we saw a vfork event but couldn't follow it until we saw | |
694 | an exec, then now might be the time! */ | |
695 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
696 | /* follow_exec is called as soon as the exec event is seen. */ | |
697 | break; | |
698 | ||
699 | default: | |
700 | break; | |
701 | } | |
702 | #endif /* HPUXHPPA */ | |
703 | ||
2f1c7c3f JK |
704 | /* Install inferior's terminal modes. */ |
705 | target_terminal_inferior (); | |
706 | ||
65b07ddc DT |
707 | if (should_resume) |
708 | { | |
709 | #ifdef HPUXHPPA | |
710 | if (thread_step_needed) | |
711 | { | |
712 | /* We stopped on a BPT instruction; | |
713 | don't continue other threads and | |
714 | just step this thread. */ | |
715 | thread_step_needed = 0; | |
716 | ||
717 | if (!breakpoint_here_p(read_pc())) | |
718 | { | |
719 | /* Breakpoint deleted: ok to do regular resume | |
720 | where all the threads either step or continue. */ | |
721 | target_resume (-1, step, sig); | |
722 | } | |
723 | else | |
724 | { | |
725 | if (!step) | |
726 | { | |
727 | warning ( "Internal error, changing continue to step." ); | |
728 | remove_breakpoints (); | |
729 | breakpoints_inserted = 0; | |
730 | trap_expected = 1; | |
731 | step = 1; | |
732 | } | |
733 | ||
734 | target_resume (inferior_pid, step, sig); | |
735 | } | |
736 | } | |
737 | else | |
738 | #endif /* HPUXHPPA */ | |
3ab2abae MS |
739 | { |
740 | /* Vanilla resume. */ | |
65b07ddc | 741 | |
3ab2abae MS |
742 | if ((scheduler_mode == schedlock_on) || |
743 | (scheduler_mode == schedlock_step && step != 0)) | |
744 | target_resume (inferior_pid, step, sig); | |
745 | else | |
746 | target_resume (-1, step, sig); | |
747 | } | |
65b07ddc | 748 | } |
3ab2abae | 749 | |
a71d17b1 JK |
750 | discard_cleanups (old_cleanups); |
751 | } | |
752 | ||
bd5635a1 RP |
753 | \f |
754 | /* Clear out all variables saying what to do when inferior is continued. | |
755 | First do this, then set the ones you want, then call `proceed'. */ | |
756 | ||
757 | void | |
758 | clear_proceed_status () | |
759 | { | |
760 | trap_expected = 0; | |
761 | step_range_start = 0; | |
762 | step_range_end = 0; | |
763 | step_frame_address = 0; | |
764 | step_over_calls = -1; | |
bd5635a1 RP |
765 | stop_after_trap = 0; |
766 | stop_soon_quietly = 0; | |
767 | proceed_to_finish = 0; | |
768 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
769 | ||
770 | /* Discard any remaining commands or status from previous stop. */ | |
771 | bpstat_clear (&stop_bpstat); | |
772 | } | |
773 | ||
774 | /* Basic routine for continuing the program in various fashions. | |
775 | ||
776 | ADDR is the address to resume at, or -1 for resume where stopped. | |
777 | SIGGNAL is the signal to give it, or 0 for none, | |
778 | or -1 for act according to how it stopped. | |
779 | STEP is nonzero if should trap after one instruction. | |
780 | -1 means return after that and print nothing. | |
781 | You should probably set various step_... variables | |
782 | before calling here, if you are stepping. | |
783 | ||
784 | You should call clear_proceed_status before calling proceed. */ | |
785 | ||
786 | void | |
787 | proceed (addr, siggnal, step) | |
788 | CORE_ADDR addr; | |
67ac9759 | 789 | enum target_signal siggnal; |
bd5635a1 RP |
790 | int step; |
791 | { | |
792 | int oneproc = 0; | |
793 | ||
794 | if (step > 0) | |
795 | step_start_function = find_pc_function (read_pc ()); | |
796 | if (step < 0) | |
797 | stop_after_trap = 1; | |
798 | ||
bdbd5f50 | 799 | if (addr == (CORE_ADDR)-1) |
bd5635a1 RP |
800 | { |
801 | /* If there is a breakpoint at the address we will resume at, | |
802 | step one instruction before inserting breakpoints | |
65b07ddc DT |
803 | so that we do not stop right away (and report a second |
804 | hit at this breakpoint). */ | |
bd5635a1 | 805 | |
4eb4b87e | 806 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
bd5635a1 | 807 | oneproc = 1; |
b5aff268 | 808 | |
02331869 AC |
809 | #ifndef STEP_SKIPS_DELAY |
810 | #define STEP_SKIPS_DELAY(pc) (0) | |
811 | #define STEP_SKIPS_DELAY_P (0) | |
812 | #endif | |
b5aff268 JK |
813 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast |
814 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY | |
815 | is slow (it needs to read memory from the target). */ | |
02331869 AC |
816 | if (STEP_SKIPS_DELAY_P |
817 | && breakpoint_here_p (read_pc () + 4) | |
b5aff268 JK |
818 | && STEP_SKIPS_DELAY (read_pc ())) |
819 | oneproc = 1; | |
bd5635a1 RP |
820 | } |
821 | else | |
65b07ddc DT |
822 | { |
823 | write_pc (addr); | |
824 | ||
825 | /* New address; we don't need to single-step a thread | |
826 | over a breakpoint we just hit, 'cause we aren't | |
827 | continuing from there. | |
828 | ||
829 | It's not worth worrying about the case where a user | |
830 | asks for a "jump" at the current PC--if they get the | |
831 | hiccup of re-hiting a hit breakpoint, what else do | |
832 | they expect? */ | |
833 | thread_step_needed = 0; | |
834 | } | |
bd5635a1 | 835 | |
320f93f7 | 836 | #ifdef PREPARE_TO_PROCEED |
65b07ddc DT |
837 | /* In a multi-threaded task we may select another thread |
838 | and then continue or step. | |
839 | ||
840 | But if the old thread was stopped at a breakpoint, it | |
841 | will immediately cause another breakpoint stop without | |
842 | any execution (i.e. it will report a breakpoint hit | |
843 | incorrectly). So we must step over it first. | |
844 | ||
845 | PREPARE_TO_PROCEED checks the current thread against the thread | |
846 | that reported the most recent event. If a step-over is required | |
847 | it returns TRUE and sets the current thread to the old thread. */ | |
848 | if (PREPARE_TO_PROCEED() && breakpoint_here_p (read_pc())) | |
849 | { | |
850 | oneproc = 1; | |
851 | thread_step_needed = 1; | |
852 | } | |
853 | ||
320f93f7 SG |
854 | #endif /* PREPARE_TO_PROCEED */ |
855 | ||
c66ed884 | 856 | #ifdef HP_OS_BUG |
bd5635a1 RP |
857 | if (trap_expected_after_continue) |
858 | { | |
859 | /* If (step == 0), a trap will be automatically generated after | |
860 | the first instruction is executed. Force step one | |
861 | instruction to clear this condition. This should not occur | |
862 | if step is nonzero, but it is harmless in that case. */ | |
863 | oneproc = 1; | |
864 | trap_expected_after_continue = 0; | |
865 | } | |
c66ed884 | 866 | #endif /* HP_OS_BUG */ |
bd5635a1 RP |
867 | |
868 | if (oneproc) | |
869 | /* We will get a trace trap after one instruction. | |
870 | Continue it automatically and insert breakpoints then. */ | |
871 | trap_expected = 1; | |
872 | else | |
873 | { | |
874 | int temp = insert_breakpoints (); | |
875 | if (temp) | |
876 | { | |
877 | print_sys_errmsg ("ptrace", temp); | |
878 | error ("Cannot insert breakpoints.\n\ | |
879 | The same program may be running in another process."); | |
880 | } | |
65b07ddc | 881 | |
bd5635a1 RP |
882 | breakpoints_inserted = 1; |
883 | } | |
884 | ||
fcbc95a7 | 885 | if (siggnal != TARGET_SIGNAL_DEFAULT) |
bd5635a1 RP |
886 | stop_signal = siggnal; |
887 | /* If this signal should not be seen by program, | |
888 | give it zero. Used for debugging signals. */ | |
67ac9759 | 889 | else if (!signal_program[stop_signal]) |
fcbc95a7 | 890 | stop_signal = TARGET_SIGNAL_0; |
bd5635a1 | 891 | |
1c95d7ab JK |
892 | annotate_starting (); |
893 | ||
c66ed884 SG |
894 | /* Make sure that output from GDB appears before output from the |
895 | inferior. */ | |
896 | gdb_flush (gdb_stdout); | |
897 | ||
bd5635a1 | 898 | /* Resume inferior. */ |
a71d17b1 | 899 | resume (oneproc || step || bpstat_should_step (), stop_signal); |
bd5635a1 RP |
900 | |
901 | /* Wait for it to stop (if not standalone) | |
902 | and in any case decode why it stopped, and act accordingly. */ | |
903 | ||
904 | wait_for_inferior (); | |
905 | normal_stop (); | |
906 | } | |
907 | ||
bd5635a1 RP |
908 | /* Record the pc and sp of the program the last time it stopped. |
909 | These are just used internally by wait_for_inferior, but need | |
910 | to be preserved over calls to it and cleared when the inferior | |
911 | is started. */ | |
912 | static CORE_ADDR prev_pc; | |
bd5635a1 RP |
913 | static CORE_ADDR prev_func_start; |
914 | static char *prev_func_name; | |
915 | ||
a71d17b1 | 916 | \f |
bd5635a1 RP |
917 | /* Start remote-debugging of a machine over a serial link. */ |
918 | ||
919 | void | |
920 | start_remote () | |
921 | { | |
4cc1b3f7 | 922 | init_thread_list (); |
bd5635a1 | 923 | init_wait_for_inferior (); |
bd5635a1 RP |
924 | stop_soon_quietly = 1; |
925 | trap_expected = 0; | |
98885d76 JK |
926 | wait_for_inferior (); |
927 | normal_stop (); | |
bd5635a1 RP |
928 | } |
929 | ||
930 | /* Initialize static vars when a new inferior begins. */ | |
931 | ||
932 | void | |
933 | init_wait_for_inferior () | |
934 | { | |
935 | /* These are meaningless until the first time through wait_for_inferior. */ | |
936 | prev_pc = 0; | |
bd5635a1 RP |
937 | prev_func_start = 0; |
938 | prev_func_name = NULL; | |
939 | ||
c66ed884 | 940 | #ifdef HP_OS_BUG |
bd5635a1 | 941 | trap_expected_after_continue = 0; |
c66ed884 | 942 | #endif |
bd5635a1 | 943 | breakpoints_inserted = 0; |
65b07ddc | 944 | breakpoint_init_inferior (inf_starting); |
67ac9759 JK |
945 | |
946 | /* Don't confuse first call to proceed(). */ | |
947 | stop_signal = TARGET_SIGNAL_0; | |
65b07ddc DT |
948 | |
949 | /* The first resume is not following a fork/vfork/exec. */ | |
950 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
951 | pending_follow.fork_event.saw_parent_fork = 0; | |
952 | pending_follow.fork_event.saw_child_fork = 0; | |
953 | pending_follow.fork_event.saw_child_exec = 0; | |
954 | ||
955 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
956 | number_of_threads_in_syscalls = 0; | |
957 | ||
958 | clear_proceed_status (); | |
bd5635a1 RP |
959 | } |
960 | ||
fe675038 JK |
961 | static void |
962 | delete_breakpoint_current_contents (arg) | |
963 | PTR arg; | |
964 | { | |
965 | struct breakpoint **breakpointp = (struct breakpoint **)arg; | |
65b07ddc DT |
966 | if (*breakpointp != NULL) |
967 | { | |
968 | delete_breakpoint (*breakpointp); | |
969 | *breakpointp = NULL; | |
970 | } | |
fe675038 | 971 | } |
bd5635a1 RP |
972 | \f |
973 | /* Wait for control to return from inferior to debugger. | |
974 | If inferior gets a signal, we may decide to start it up again | |
975 | instead of returning. That is why there is a loop in this function. | |
976 | When this function actually returns it means the inferior | |
977 | should be left stopped and GDB should read more commands. */ | |
978 | ||
979 | void | |
980 | wait_for_inferior () | |
981 | { | |
fe675038 | 982 | struct cleanup *old_cleanups; |
67ac9759 | 983 | struct target_waitstatus w; |
bd5635a1 | 984 | int another_trap; |
b607efe7 | 985 | int random_signal = 0; |
bd5635a1 | 986 | CORE_ADDR stop_func_start; |
67ac9759 | 987 | CORE_ADDR stop_func_end; |
bd5635a1 | 988 | char *stop_func_name; |
894d8e69 JL |
989 | #if 0 |
990 | CORE_ADDR prologue_pc = 0; | |
991 | #endif | |
992 | CORE_ADDR tmp; | |
bd5635a1 RP |
993 | struct symtab_and_line sal; |
994 | int remove_breakpoints_on_following_step = 0; | |
b3b39c0c | 995 | int current_line; |
b2f03c30 | 996 | struct symtab *current_symtab; |
30875e1c | 997 | int handling_longjmp = 0; /* FIXME */ |
37c99ddb | 998 | int pid; |
65b07ddc | 999 | int saved_inferior_pid; |
479f0f18 | 1000 | int update_step_sp = 0; |
65b07ddc DT |
1001 | int stepping_through_solib_after_catch = 0; |
1002 | bpstat stepping_through_solib_catchpoints = NULL; | |
1003 | int enable_hw_watchpoints_after_wait = 0; | |
1004 | int stepping_through_sigtramp = 0; | |
1005 | int new_thread_event; | |
1006 | ||
1007 | #ifdef HAVE_NONSTEPPABLE_WATCHPOINT | |
1008 | int stepped_after_stopped_by_watchpoint; | |
1009 | #endif | |
bd5635a1 | 1010 | |
fe675038 JK |
1011 | old_cleanups = make_cleanup (delete_breakpoint_current_contents, |
1012 | &step_resume_breakpoint); | |
bcc37718 JK |
1013 | make_cleanup (delete_breakpoint_current_contents, |
1014 | &through_sigtramp_breakpoint); | |
b3b39c0c SG |
1015 | sal = find_pc_line(prev_pc, 0); |
1016 | current_line = sal.line; | |
b2f03c30 | 1017 | current_symtab = sal.symtab; |
b3b39c0c | 1018 | |
cb6b0202 | 1019 | /* Are we stepping? */ |
bcc37718 JK |
1020 | #define CURRENTLY_STEPPING() \ |
1021 | ((through_sigtramp_breakpoint == NULL \ | |
1022 | && !handling_longjmp \ | |
1023 | && ((step_range_end && step_resume_breakpoint == NULL) \ | |
1024 | || trap_expected)) \ | |
65b07ddc | 1025 | || stepping_through_solib_after_catch \ |
bcc37718 | 1026 | || bpstat_should_step ()) |
1f205f9d MS |
1027 | ; |
1028 | thread_step_needed = 0; | |
65b07ddc DT |
1029 | |
1030 | #ifdef HPUXHPPA | |
1031 | /* We'll update this if & when we switch to a new thread. */ | |
1032 | switched_from_inferior_pid = inferior_pid; | |
1033 | #endif | |
1034 | ||
bd5635a1 RP |
1035 | while (1) |
1036 | { | |
24a38525 DP |
1037 | extern int overlay_cache_invalid; /* declared in symfile.h */ |
1038 | ||
1039 | overlay_cache_invalid = 1; | |
1040 | ||
320f93f7 SG |
1041 | /* We have to invalidate the registers BEFORE calling target_wait because |
1042 | they can be loaded from the target while in target_wait. This makes | |
1043 | remote debugging a bit more efficient for those targets that provide | |
1044 | critical registers as part of their normal status mechanism. */ | |
1045 | ||
1046 | registers_changed (); | |
1047 | ||
479f0f18 SG |
1048 | if (target_wait_hook) |
1049 | pid = target_wait_hook (-1, &w); | |
1050 | else | |
1051 | pid = target_wait (-1, &w); | |
1c95d7ab | 1052 | |
65b07ddc DT |
1053 | /* Since we've done a wait, we have a new event. Don't carry |
1054 | over any expectations about needing to step over a | |
1055 | breakpoint. */ | |
1056 | thread_step_needed = 0; | |
1057 | ||
1058 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event is | |
1059 | serviced in this loop, below. */ | |
1060 | if (enable_hw_watchpoints_after_wait) | |
1061 | { | |
1062 | TARGET_ENABLE_HW_WATCHPOINTS(inferior_pid); | |
1063 | enable_hw_watchpoints_after_wait = 0; | |
1064 | } | |
1065 | ||
1066 | ||
1067 | #ifdef HAVE_NONSTEPPABLE_WATCHPOINT | |
1068 | stepped_after_stopped_by_watchpoint = 0; | |
1069 | #endif | |
1070 | ||
894d8e69 JL |
1071 | /* Gross. |
1072 | ||
1073 | We goto this label from elsewhere in wait_for_inferior when we want | |
1074 | to continue the main loop without calling "wait" and trashing the | |
1075 | waitstatus contained in W. */ | |
48f4903f JL |
1076 | have_waited: |
1077 | ||
bd5635a1 | 1078 | flush_cached_frames (); |
320f93f7 SG |
1079 | |
1080 | /* If it's a new process, add it to the thread database */ | |
1081 | ||
65b07ddc DT |
1082 | new_thread_event = ((pid != inferior_pid) && !in_thread_list (pid)); |
1083 | ||
24a38525 | 1084 | if (w.kind != TARGET_WAITKIND_EXITED |
02331869 | 1085 | && w.kind != TARGET_WAITKIND_SIGNALLED |
65b07ddc | 1086 | && new_thread_event) |
320f93f7 | 1087 | { |
320f93f7 | 1088 | add_thread (pid); |
65b07ddc DT |
1089 | |
1090 | ||
1091 | #ifdef HPUXHPPA | |
1f205f9d MS |
1092 | fprintf_unfiltered (gdb_stderr, "[New %s]\n", |
1093 | target_pid_or_tid_to_str (pid)); | |
65b07ddc DT |
1094 | |
1095 | #else | |
24a38525 | 1096 | printf_filtered ("[New %s]\n", target_pid_to_str (pid)); |
65b07ddc | 1097 | #endif |
479f0f18 | 1098 | |
65b07ddc | 1099 | #if 0 |
1f205f9d MS |
1100 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1101 | "thread creation event"! If it is invoked for any other | |
1102 | sort of event (such as a new thread landing on a breakpoint), | |
1103 | the event will be discarded, which is almost certainly | |
1104 | a bad thing! | |
1105 | ||
1106 | To avoid this, the low-level module (eg. target_wait) | |
1107 | should call in_thread_list and add_thread, so that the | |
1108 | new thread is known by the time we get here. */ | |
1109 | ||
1110 | /* We may want to consider not doing a resume here in order | |
1111 | to give the user a chance to play with the new thread. | |
1112 | It might be good to make that a user-settable option. */ | |
1113 | ||
1114 | /* At this point, all threads are stopped (happens | |
1115 | automatically in either the OS or the native code). | |
1116 | Therefore we need to continue all threads in order to | |
1117 | make progress. */ | |
479f0f18 SG |
1118 | |
1119 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
1120 | continue; | |
65b07ddc DT |
1121 | #endif |
1122 | } | |
bd5635a1 | 1123 | |
fcbc95a7 JK |
1124 | switch (w.kind) |
1125 | { | |
1126 | case TARGET_WAITKIND_LOADED: | |
24a38525 DP |
1127 | /* Ignore gracefully during startup of the inferior, as it |
1128 | might be the shell which has just loaded some objects, | |
1129 | otherwise add the symbols for the newly loaded objects. */ | |
1130 | #ifdef SOLIB_ADD | |
1131 | if (!stop_soon_quietly) | |
fcbc95a7 | 1132 | { |
24a38525 DP |
1133 | extern int auto_solib_add; |
1134 | ||
1135 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1136 | breakpoint addresses via breakpoint_re_set. */ | |
1137 | if (breakpoints_inserted) | |
1138 | remove_breakpoints (); | |
1139 | ||
1140 | /* Check for any newly added shared libraries if we're | |
1141 | supposed to be adding them automatically. */ | |
1142 | if (auto_solib_add) | |
1143 | { | |
1144 | /* Switch terminal for any messages produced by | |
1145 | breakpoint_re_set. */ | |
1146 | target_terminal_ours_for_output (); | |
1147 | SOLIB_ADD (NULL, 0, NULL); | |
1148 | target_terminal_inferior (); | |
1149 | } | |
1150 | ||
1151 | /* Reinsert breakpoints and continue. */ | |
1152 | if (breakpoints_inserted) | |
1153 | insert_breakpoints (); | |
fcbc95a7 | 1154 | } |
24a38525 | 1155 | #endif |
fcbc95a7 JK |
1156 | resume (0, TARGET_SIGNAL_0); |
1157 | continue; | |
1eeba686 | 1158 | |
fcbc95a7 JK |
1159 | case TARGET_WAITKIND_SPURIOUS: |
1160 | resume (0, TARGET_SIGNAL_0); | |
1161 | continue; | |
1eeba686 | 1162 | |
fcbc95a7 | 1163 | case TARGET_WAITKIND_EXITED: |
bd5635a1 | 1164 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1c95d7ab | 1165 | annotate_exited (w.value.integer); |
67ac9759 | 1166 | if (w.value.integer) |
e37a6e9c | 1167 | printf_filtered ("\nProgram exited with code 0%o.\n", |
67ac9759 | 1168 | (unsigned int)w.value.integer); |
bd5635a1 | 1169 | else |
479f0f18 | 1170 | printf_filtered ("\nProgram exited normally.\n"); |
2b576293 C |
1171 | |
1172 | /* Record the exit code in the convenience variable $_exitcode, so | |
1173 | that the user can inspect this again later. */ | |
1174 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1175 | value_from_longest (builtin_type_int, | |
1176 | (LONGEST) w.value.integer)); | |
199b2450 | 1177 | gdb_flush (gdb_stdout); |
bd5635a1 | 1178 | target_mourn_inferior (); |
02331869 | 1179 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P*/ |
bd5635a1 | 1180 | stop_print_frame = 0; |
fcbc95a7 | 1181 | goto stop_stepping; |
67ac9759 | 1182 | |
fcbc95a7 | 1183 | case TARGET_WAITKIND_SIGNALLED: |
bd5635a1 | 1184 | stop_print_frame = 0; |
67ac9759 | 1185 | stop_signal = w.value.sig; |
bd5635a1 | 1186 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1c95d7ab | 1187 | annotate_signalled (); |
4cc1b3f7 JK |
1188 | |
1189 | /* This looks pretty bogus to me. Doesn't TARGET_WAITKIND_SIGNALLED | |
1190 | mean it is already dead? This has been here since GDB 2.8, so | |
1191 | perhaps it means rms didn't understand unix waitstatuses? | |
1192 | For the moment I'm just kludging around this in remote.c | |
1193 | rather than trying to change it here --kingdon, 5 Dec 1994. */ | |
30875e1c | 1194 | target_kill (); /* kill mourns as well */ |
4cc1b3f7 | 1195 | |
1c95d7ab JK |
1196 | printf_filtered ("\nProgram terminated with signal "); |
1197 | annotate_signal_name (); | |
1198 | printf_filtered ("%s", target_signal_to_name (stop_signal)); | |
1199 | annotate_signal_name_end (); | |
1200 | printf_filtered (", "); | |
1201 | annotate_signal_string (); | |
1202 | printf_filtered ("%s", target_signal_to_string (stop_signal)); | |
1203 | annotate_signal_string_end (); | |
1204 | printf_filtered (".\n"); | |
67ac9759 | 1205 | |
fee44494 | 1206 | printf_filtered ("The program no longer exists.\n"); |
199b2450 | 1207 | gdb_flush (gdb_stdout); |
02331869 | 1208 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P*/ |
fcbc95a7 JK |
1209 | goto stop_stepping; |
1210 | ||
65b07ddc DT |
1211 | /* The following are the only cases in which we keep going; |
1212 | the above cases end in a continue or goto. */ | |
1213 | case TARGET_WAITKIND_FORKED: | |
1214 | stop_signal = TARGET_SIGNAL_TRAP; | |
1215 | pending_follow.kind = w.kind; | |
1216 | ||
1217 | /* Ignore fork events reported for the parent; we're only | |
1218 | interested in reacting to forks of the child. Note that | |
1219 | we expect the child's fork event to be available if we | |
1220 | waited for it now. */ | |
1221 | if (inferior_pid == pid) | |
1222 | { | |
1223 | pending_follow.fork_event.saw_parent_fork = 1; | |
1224 | pending_follow.fork_event.parent_pid = pid; | |
1225 | pending_follow.fork_event.child_pid = w.value.related_pid; | |
1226 | continue; | |
1227 | } | |
1228 | else | |
1229 | { | |
1230 | pending_follow.fork_event.saw_child_fork = 1; | |
1231 | pending_follow.fork_event.child_pid = pid; | |
1232 | pending_follow.fork_event.parent_pid = w.value.related_pid; | |
1233 | } | |
1234 | ||
1235 | stop_pc = read_pc_pid (pid); | |
1236 | saved_inferior_pid = inferior_pid; | |
1237 | inferior_pid = pid; | |
1f205f9d MS |
1238 | stop_bpstat = bpstat_stop_status |
1239 | (&stop_pc, | |
65b07ddc | 1240 | #if DECR_PC_AFTER_BREAK |
1f205f9d MS |
1241 | (prev_pc != stop_pc - DECR_PC_AFTER_BREAK |
1242 | && CURRENTLY_STEPPING ()) | |
65b07ddc | 1243 | #else /* DECR_PC_AFTER_BREAK zero */ |
1f205f9d | 1244 | 0 |
65b07ddc | 1245 | #endif /* DECR_PC_AFTER_BREAK zero */ |
1f205f9d | 1246 | ); |
65b07ddc DT |
1247 | random_signal = ! bpstat_explains_signal (stop_bpstat); |
1248 | inferior_pid = saved_inferior_pid; | |
1249 | goto process_event_stop_test; | |
1250 | ||
1251 | /* If this a platform which doesn't allow a debugger to touch a | |
1252 | vfork'd inferior until after it exec's, then we'd best keep | |
1253 | our fingers entirely off the inferior, other than continuing | |
1254 | it. This has the unfortunate side-effect that catchpoints | |
1255 | of vforks will be ignored. But since the platform doesn't | |
1256 | allow the inferior be touched at vfork time, there's really | |
1257 | little choice. */ | |
1258 | case TARGET_WAITKIND_VFORKED: | |
1259 | stop_signal = TARGET_SIGNAL_TRAP; | |
1260 | pending_follow.kind = w.kind; | |
1261 | ||
1262 | /* Is this a vfork of the parent? If so, then give any | |
1263 | vfork catchpoints a chance to trigger now. (It's | |
1264 | dangerous to do so if the child canot be touched until | |
1265 | it execs, and the child has not yet exec'd. We probably | |
1266 | should warn the user to that effect when the catchpoint | |
1267 | triggers...) */ | |
1268 | if (pid == inferior_pid) | |
1269 | { | |
1270 | pending_follow.fork_event.saw_parent_fork = 1; | |
1271 | pending_follow.fork_event.parent_pid = pid; | |
1272 | pending_follow.fork_event.child_pid = w.value.related_pid; | |
1273 | } | |
1274 | ||
1275 | /* If we've seen the child's vfork event but cannot really touch | |
1276 | the child until it execs, then we must continue the child now. | |
1277 | Else, give any vfork catchpoints a chance to trigger now. */ | |
1278 | else | |
1279 | { | |
1280 | pending_follow.fork_event.saw_child_fork = 1; | |
1281 | pending_follow.fork_event.child_pid = pid; | |
1282 | pending_follow.fork_event.parent_pid = w.value.related_pid; | |
1283 | target_post_startup_inferior (pending_follow.fork_event.child_pid); | |
1284 | follow_vfork_when_exec = ! target_can_follow_vfork_prior_to_exec (); | |
1285 | if (follow_vfork_when_exec) | |
1286 | { | |
1287 | target_resume (pid, 0, TARGET_SIGNAL_0); | |
1288 | continue; | |
1289 | } | |
1290 | } | |
1291 | ||
1292 | stop_pc = read_pc (); | |
1f205f9d MS |
1293 | stop_bpstat = bpstat_stop_status |
1294 | (&stop_pc, | |
65b07ddc | 1295 | #if DECR_PC_AFTER_BREAK |
1f205f9d MS |
1296 | (prev_pc != stop_pc - DECR_PC_AFTER_BREAK |
1297 | && CURRENTLY_STEPPING ()) | |
65b07ddc | 1298 | #else /* DECR_PC_AFTER_BREAK zero */ |
1f205f9d | 1299 | 0 |
65b07ddc | 1300 | #endif /* DECR_PC_AFTER_BREAK zero */ |
1f205f9d | 1301 | ); |
65b07ddc DT |
1302 | random_signal = ! bpstat_explains_signal (stop_bpstat); |
1303 | goto process_event_stop_test; | |
1304 | ||
1305 | case TARGET_WAITKIND_EXECD: | |
1306 | stop_signal = TARGET_SIGNAL_TRAP; | |
1307 | ||
1308 | /* Is this a target which reports multiple exec events per actual | |
1309 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1310 | ignore all but the last one. Just resume the exec'r, and wait | |
1311 | for the next exec event. */ | |
1312 | if (inferior_ignoring_leading_exec_events) | |
1313 | { | |
1314 | inferior_ignoring_leading_exec_events--; | |
1315 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1316 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED(pending_follow.fork_event.parent_pid); | |
1317 | target_resume (pid, 0, TARGET_SIGNAL_0); | |
1318 | continue; | |
1319 | } | |
1320 | inferior_ignoring_leading_exec_events = | |
1321 | target_reported_exec_events_per_exec_call () - 1; | |
1322 | ||
1323 | pending_follow.execd_pathname = savestring (w.value.execd_pathname, | |
1324 | strlen (w.value.execd_pathname)); | |
1325 | ||
1326 | /* Did inferior_pid exec, or did a (possibly not-yet-followed) | |
1327 | child of a vfork exec? | |
1328 | ||
1329 | ??rehrauer: This is unabashedly an HP-UX specific thing. On | |
1330 | HP-UX, events associated with a vforking inferior come in | |
1331 | threes: a vfork event for the child (always first), followed | |
1332 | a vfork event for the parent and an exec event for the child. | |
1333 | The latter two can come in either order. | |
1334 | ||
1335 | If we get the parent vfork event first, life's good: We follow | |
1336 | either the parent or child, and then the child's exec event is | |
1337 | a "don't care". | |
1338 | ||
1339 | But if we get the child's exec event first, then we delay | |
1340 | responding to it until we handle the parent's vfork. Because, | |
1341 | otherwise we can't satisfy a "catch vfork". */ | |
1342 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1343 | { | |
1344 | pending_follow.fork_event.saw_child_exec = 1; | |
1345 | ||
1346 | /* On some targets, the child must be resumed before | |
1347 | the parent vfork event is delivered. A single-step | |
1348 | suffices. */ | |
1349 | if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK()) | |
1350 | target_resume (pid, 1, TARGET_SIGNAL_0); | |
1f205f9d MS |
1351 | /* We expect the parent vfork event to be available now. */ |
1352 | continue; | |
65b07ddc DT |
1353 | } |
1354 | ||
1355 | /* This causes the eventpoints and symbol table to be reset. Must | |
1356 | do this now, before trying to determine whether to stop. */ | |
1357 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
1358 | free (pending_follow.execd_pathname); | |
1359 | ||
1360 | stop_pc = read_pc_pid (pid); | |
1361 | saved_inferior_pid = inferior_pid; | |
1362 | inferior_pid = pid; | |
1f205f9d MS |
1363 | stop_bpstat = bpstat_stop_status |
1364 | (&stop_pc, | |
65b07ddc | 1365 | #if DECR_PC_AFTER_BREAK |
1f205f9d MS |
1366 | (prev_pc != stop_pc - DECR_PC_AFTER_BREAK |
1367 | && CURRENTLY_STEPPING ()) | |
65b07ddc | 1368 | #else /* DECR_PC_AFTER_BREAK zero */ |
1f205f9d | 1369 | 0 |
65b07ddc | 1370 | #endif /* DECR_PC_AFTER_BREAK zero */ |
1f205f9d | 1371 | ); |
65b07ddc DT |
1372 | random_signal = ! bpstat_explains_signal (stop_bpstat); |
1373 | inferior_pid = saved_inferior_pid; | |
1374 | goto process_event_stop_test; | |
1375 | ||
1376 | /* These syscall events are returned on HP-UX, as part of its | |
1377 | implementation of page-protection-based "hardware" watchpoints. | |
1378 | HP-UX has unfortunate interactions between page-protections and | |
1379 | some system calls. Our solution is to disable hardware watches | |
1380 | when a system call is entered, and reenable them when the syscall | |
1381 | completes. The downside of this is that we may miss the precise | |
1382 | point at which a watched piece of memory is modified. "Oh well." | |
1383 | ||
1384 | Note that we may have multiple threads running, which may each | |
1385 | enter syscalls at roughly the same time. Since we don't have a | |
1386 | good notion currently of whether a watched piece of memory is | |
1387 | thread-private, we'd best not have any page-protections active | |
1388 | when any thread is in a syscall. Thus, we only want to reenable | |
1389 | hardware watches when no threads are in a syscall. | |
1390 | ||
1391 | Also, be careful not to try to gather much state about a thread | |
1392 | that's in a syscall. It's frequently a losing proposition. */ | |
1393 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1394 | number_of_threads_in_syscalls++; | |
1395 | if (number_of_threads_in_syscalls == 1) | |
1396 | { | |
1397 | TARGET_DISABLE_HW_WATCHPOINTS(inferior_pid); | |
1398 | } | |
1399 | resume (0, TARGET_SIGNAL_0); | |
1400 | continue; | |
1401 | ||
1402 | /* Before examining the threads further, step this thread to | |
1f205f9d MS |
1403 | get it entirely out of the syscall. (We get notice of the |
1404 | event when the thread is just on the verge of exiting a | |
1405 | syscall. Stepping one instruction seems to get it back | |
1406 | into user code.) | |
1407 | ||
1408 | Note that although the logical place to reenable h/w watches | |
1409 | is here, we cannot. We cannot reenable them before stepping | |
1410 | the thread (this causes the next wait on the thread to hang). | |
1411 | ||
1412 | Nor can we enable them after stepping until we've done a wait. | |
1413 | Thus, we simply set the flag enable_hw_watchpoints_after_wait | |
1414 | here, which will be serviced immediately after the target | |
1415 | is waited on. */ | |
65b07ddc DT |
1416 | case TARGET_WAITKIND_SYSCALL_RETURN: |
1417 | target_resume (pid, 1, TARGET_SIGNAL_0); | |
1418 | ||
1419 | if (number_of_threads_in_syscalls > 0) | |
1420 | { | |
1421 | number_of_threads_in_syscalls--; | |
1422 | enable_hw_watchpoints_after_wait = | |
1423 | (number_of_threads_in_syscalls == 0); | |
1424 | } | |
1425 | continue; | |
1426 | ||
fcbc95a7 | 1427 | case TARGET_WAITKIND_STOPPED: |
65b07ddc | 1428 | stop_signal = w.value.sig; |
bd5635a1 RP |
1429 | break; |
1430 | } | |
de43d7d0 | 1431 | |
65b07ddc DT |
1432 | /* We may want to consider not doing a resume here in order to give |
1433 | the user a chance to play with the new thread. It might be good | |
1434 | to make that a user-settable option. */ | |
1435 | ||
1436 | /* At this point, all threads are stopped (happens automatically in | |
1437 | either the OS or the native code). Therefore we need to continue | |
1438 | all threads in order to make progress. */ | |
1439 | if (new_thread_event) | |
1440 | { | |
1441 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
1442 | continue; | |
1443 | } | |
48f4903f JL |
1444 | |
1445 | stop_pc = read_pc_pid (pid); | |
1446 | ||
320f93f7 SG |
1447 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1448 | another thread. If so, then step that thread past the breakpoint, | |
1449 | and continue it. */ | |
de43d7d0 | 1450 | |
8fc2b417 | 1451 | if (stop_signal == TARGET_SIGNAL_TRAP) |
b2f03c30 | 1452 | { |
02331869 | 1453 | if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) |
8fc2b417 SG |
1454 | random_signal = 0; |
1455 | else | |
8fc2b417 SG |
1456 | if (breakpoints_inserted |
1457 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
1458 | { | |
1459 | random_signal = 0; | |
1f205f9d MS |
1460 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, |
1461 | pid)) | |
8fc2b417 | 1462 | { |
65b07ddc DT |
1463 | int remove_status; |
1464 | ||
1f205f9d MS |
1465 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1466 | Just continue. */ | |
8fc2b417 SG |
1467 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, pid); |
1468 | ||
65b07ddc | 1469 | remove_status = remove_breakpoints (); |
1f205f9d MS |
1470 | /* Did we fail to remove breakpoints? If so, try |
1471 | to set the PC past the bp. (There's at least | |
1472 | one situation in which we can fail to remove | |
1473 | the bp's: On HP-UX's that use ttrace, we can't | |
1474 | change the address space of a vforking child | |
1475 | process until the child exits (well, okay, not | |
1476 | then either :-) or execs. */ | |
1477 | if (remove_status != 0) | |
1478 | { | |
1479 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, pid); | |
1480 | } | |
8fc2b417 | 1481 | else |
1f205f9d MS |
1482 | { /* Single step */ |
1483 | target_resume (pid, 1, TARGET_SIGNAL_0); | |
1484 | /* FIXME: What if a signal arrives instead of the | |
1485 | single-step happening? */ | |
1486 | ||
1487 | if (target_wait_hook) | |
1488 | target_wait_hook (pid, &w); | |
1489 | else | |
1490 | target_wait (pid, &w); | |
1491 | insert_breakpoints (); | |
1492 | } | |
8fc2b417 SG |
1493 | |
1494 | /* We need to restart all the threads now. */ | |
1495 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
1496 | continue; | |
1497 | } | |
1f205f9d MS |
1498 | else |
1499 | { | |
1500 | /* This breakpoint matches--either it is the right | |
1501 | thread or it's a generic breakpoint for all threads. | |
1502 | Remember that we'll need to step just _this_ thread | |
1503 | on any following user continuation! */ | |
1504 | thread_step_needed = 1; | |
1505 | } | |
1506 | } | |
b2f03c30 | 1507 | } |
320f93f7 SG |
1508 | else |
1509 | random_signal = 1; | |
1510 | ||
1511 | /* See if something interesting happened to the non-current thread. If | |
1512 | so, then switch to that thread, and eventually give control back to | |
65b07ddc | 1513 | the user. |
de43d7d0 | 1514 | |
65b07ddc DT |
1515 | Note that if there's any kind of pending follow (i.e., of a fork, |
1516 | vfork or exec), we don't want to do this now. Rather, we'll let | |
1517 | the next resume handle it. */ | |
1518 | if ((pid != inferior_pid) && | |
1519 | (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) | |
37c99ddb JK |
1520 | { |
1521 | int printed = 0; | |
1522 | ||
320f93f7 | 1523 | /* If it's a random signal for a non-current thread, notify user |
65b07ddc | 1524 | if he's expressed an interest. */ |
320f93f7 SG |
1525 | if (random_signal |
1526 | && signal_print[stop_signal]) | |
1527 | { | |
65b07ddc DT |
1528 | /* ??rehrauer: I don't understand the rationale for this code. If the |
1529 | inferior will stop as a result of this signal, then the act of handling | |
1530 | the stop ought to print a message that's couches the stoppage in user | |
1531 | terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior | |
1532 | won't stop as a result of the signal -- i.e., if the signal is merely | |
1533 | a side-effect of something GDB's doing "under the covers" for the | |
1534 | user, such as stepping threads over a breakpoint they shouldn't stop | |
1535 | for -- then the message seems to be a serious annoyance at best. | |
1536 | ||
1537 | For now, remove the message altogether. */ | |
1538 | #if 0 | |
320f93f7 SG |
1539 | printed = 1; |
1540 | target_terminal_ours_for_output (); | |
1541 | printf_filtered ("\nProgram received signal %s, %s.\n", | |
1542 | target_signal_to_name (stop_signal), | |
1543 | target_signal_to_string (stop_signal)); | |
1544 | gdb_flush (gdb_stdout); | |
65b07ddc | 1545 | #endif |
320f93f7 SG |
1546 | } |
1547 | ||
1548 | /* If it's not SIGTRAP and not a signal we want to stop for, then | |
1549 | continue the thread. */ | |
1550 | ||
1551 | if (stop_signal != TARGET_SIGNAL_TRAP | |
1552 | && !signal_stop[stop_signal]) | |
37c99ddb | 1553 | { |
320f93f7 SG |
1554 | if (printed) |
1555 | target_terminal_inferior (); | |
37c99ddb | 1556 | |
320f93f7 SG |
1557 | /* Clear the signal if it should not be passed. */ |
1558 | if (signal_program[stop_signal] == 0) | |
1559 | stop_signal = TARGET_SIGNAL_0; | |
1560 | ||
1561 | target_resume (pid, 0, stop_signal); | |
37c99ddb JK |
1562 | continue; |
1563 | } | |
320f93f7 SG |
1564 | |
1565 | /* It's a SIGTRAP or a signal we're interested in. Switch threads, | |
1566 | and fall into the rest of wait_for_inferior(). */ | |
1567 | ||
2b576293 C |
1568 | /* Save infrun state for the old thread. */ |
1569 | save_infrun_state (inferior_pid, prev_pc, | |
1570 | prev_func_start, prev_func_name, | |
1571 | trap_expected, step_resume_breakpoint, | |
1572 | through_sigtramp_breakpoint, | |
1573 | step_range_start, step_range_end, | |
1574 | step_frame_address, handling_longjmp, | |
65b07ddc DT |
1575 | another_trap, |
1576 | stepping_through_solib_after_catch, | |
1577 | stepping_through_solib_catchpoints, | |
1578 | stepping_through_sigtramp); | |
1579 | ||
1580 | #ifdef HPUXHPPA | |
1581 | switched_from_inferior_pid = inferior_pid; | |
1582 | #endif | |
2b576293 | 1583 | |
320f93f7 | 1584 | inferior_pid = pid; |
2b576293 C |
1585 | |
1586 | /* Load infrun state for the new thread. */ | |
1587 | load_infrun_state (inferior_pid, &prev_pc, | |
1588 | &prev_func_start, &prev_func_name, | |
1589 | &trap_expected, &step_resume_breakpoint, | |
1590 | &through_sigtramp_breakpoint, | |
1591 | &step_range_start, &step_range_end, | |
1592 | &step_frame_address, &handling_longjmp, | |
65b07ddc DT |
1593 | &another_trap, |
1594 | &stepping_through_solib_after_catch, | |
1595 | &stepping_through_solib_catchpoints, | |
1596 | &stepping_through_sigtramp); | |
02331869 AC |
1597 | |
1598 | if (context_hook) | |
1599 | context_hook (pid_to_thread_id (pid)); | |
1600 | ||
320f93f7 | 1601 | printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid)); |
320f93f7 | 1602 | flush_cached_frames (); |
37c99ddb JK |
1603 | } |
1604 | ||
02331869 AC |
1605 | if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) |
1606 | { | |
1607 | /* Pull the single step breakpoints out of the target. */ | |
1608 | SOFTWARE_SINGLE_STEP (0, 0); | |
1609 | singlestep_breakpoints_inserted_p = 0; | |
1610 | } | |
bd5635a1 | 1611 | |
999dd04b JL |
1612 | /* If PC is pointing at a nullified instruction, then step beyond |
1613 | it so that the user won't be confused when GDB appears to be ready | |
1614 | to execute it. */ | |
9f739abd | 1615 | |
65b07ddc DT |
1616 | #if 0 /* XXX DEBUG */ |
1617 | printf ("infrun.c:1607: pc = 0x%x\n", read_pc ()); | |
1618 | #endif | |
1619 | /* if (INSTRUCTION_NULLIFIED && CURRENTLY_STEPPING ()) */ | |
9f739abd SG |
1620 | if (INSTRUCTION_NULLIFIED) |
1621 | { | |
894d8e69 | 1622 | struct target_waitstatus tmpstatus; |
65b07ddc DT |
1623 | #if 0 |
1624 | all_registers_info ((char *)0, 0); | |
1625 | #endif | |
7dbb5eed | 1626 | registers_changed (); |
894d8e69 JL |
1627 | target_resume (pid, 1, TARGET_SIGNAL_0); |
1628 | ||
1629 | /* We may have received a signal that we want to pass to | |
1630 | the inferior; therefore, we must not clobber the waitstatus | |
1631 | in W. So we call wait ourselves, then continue the loop | |
1632 | at the "have_waited" label. */ | |
1633 | if (target_wait_hook) | |
1634 | target_wait_hook (pid, &tmpstatus); | |
1635 | else | |
1636 | target_wait (pid, &tmpstatus); | |
1637 | ||
1638 | goto have_waited; | |
9f739abd SG |
1639 | } |
1640 | ||
48f4903f JL |
1641 | #ifdef HAVE_STEPPABLE_WATCHPOINT |
1642 | /* It may not be necessary to disable the watchpoint to stop over | |
1643 | it. For example, the PA can (with some kernel cooperation) | |
1644 | single step over a watchpoint without disabling the watchpoint. */ | |
1645 | if (STOPPED_BY_WATCHPOINT (w)) | |
1646 | { | |
1647 | resume (1, 0); | |
1648 | continue; | |
1649 | } | |
1650 | #endif | |
1651 | ||
1652 | #ifdef HAVE_NONSTEPPABLE_WATCHPOINT | |
1653 | /* It is far more common to need to disable a watchpoint | |
1654 | to step the inferior over it. FIXME. What else might | |
1655 | a debug register or page protection watchpoint scheme need | |
1656 | here? */ | |
1657 | if (STOPPED_BY_WATCHPOINT (w)) | |
1658 | { | |
1659 | /* At this point, we are stopped at an instruction which has attempted to write | |
1660 | to a piece of memory under control of a watchpoint. The instruction hasn't | |
1661 | actually executed yet. If we were to evaluate the watchpoint expression | |
1662 | now, we would get the old value, and therefore no change would seem to have | |
1663 | occurred. | |
1664 | ||
1665 | In order to make watchpoints work `right', we really need to complete the | |
1666 | memory write, and then evaluate the watchpoint expression. The following | |
1667 | code does that by removing the watchpoint (actually, all watchpoints and | |
1668 | breakpoints), single-stepping the target, re-inserting watchpoints, and then | |
1669 | falling through to let normal single-step processing handle proceed. Since | |
1670 | this includes evaluating watchpoints, things will come to a stop in the | |
1671 | correct manner. */ | |
1672 | ||
1673 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
1674 | ||
1675 | remove_breakpoints (); | |
24a38525 | 1676 | registers_changed(); |
48f4903f JL |
1677 | target_resume (pid, 1, TARGET_SIGNAL_0); /* Single step */ |
1678 | ||
1679 | if (target_wait_hook) | |
1680 | target_wait_hook (pid, &w); | |
1681 | else | |
1682 | target_wait (pid, &w); | |
1683 | insert_breakpoints (); | |
65b07ddc | 1684 | |
48f4903f JL |
1685 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1686 | handle things like signals arriving and other things happening | |
1687 | in combination correctly? */ | |
65b07ddc | 1688 | stepped_after_stopped_by_watchpoint = 1; |
48f4903f JL |
1689 | goto have_waited; |
1690 | } | |
1691 | #endif | |
1692 | ||
1693 | #ifdef HAVE_CONTINUABLE_WATCHPOINT | |
1694 | /* It may be possible to simply continue after a watchpoint. */ | |
1695 | STOPPED_BY_WATCHPOINT (w); | |
1696 | #endif | |
1697 | ||
bd5635a1 | 1698 | stop_func_start = 0; |
4eb4b87e | 1699 | stop_func_end = 0; |
bd5635a1 RP |
1700 | stop_func_name = 0; |
1701 | /* Don't care about return value; stop_func_start and stop_func_name | |
1702 | will both be 0 if it doesn't work. */ | |
37c99ddb | 1703 | find_pc_partial_function (stop_pc, &stop_func_name, &stop_func_start, |
67ac9759 | 1704 | &stop_func_end); |
bd5635a1 RP |
1705 | stop_func_start += FUNCTION_START_OFFSET; |
1706 | another_trap = 0; | |
1707 | bpstat_clear (&stop_bpstat); | |
1708 | stop_step = 0; | |
1709 | stop_stack_dummy = 0; | |
1710 | stop_print_frame = 1; | |
bd5635a1 RP |
1711 | random_signal = 0; |
1712 | stopped_by_random_signal = 0; | |
1713 | breakpoints_failed = 0; | |
1714 | ||
1715 | /* Look at the cause of the stop, and decide what to do. | |
1716 | The alternatives are: | |
1717 | 1) break; to really stop and return to the debugger, | |
1718 | 2) drop through to start up again | |
1719 | (set another_trap to 1 to single step once) | |
1720 | 3) set random_signal to 1, and the decision between 1 and 2 | |
1721 | will be made according to the signal handling tables. */ | |
1722 | ||
bd5635a1 RP |
1723 | /* First, distinguish signals caused by the debugger from signals |
1724 | that have to do with the program's own actions. | |
1725 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
1726 | or SIGEMT, depending on the operating system version. | |
1727 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
1728 | and change it to SIGTRAP. */ | |
1729 | ||
67ac9759 | 1730 | if (stop_signal == TARGET_SIGNAL_TRAP |
bd5635a1 | 1731 | || (breakpoints_inserted && |
67ac9759 JK |
1732 | (stop_signal == TARGET_SIGNAL_ILL |
1733 | || stop_signal == TARGET_SIGNAL_EMT | |
e37a6e9c | 1734 | )) |
bd5635a1 RP |
1735 | || stop_soon_quietly) |
1736 | { | |
67ac9759 | 1737 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) |
bd5635a1 RP |
1738 | { |
1739 | stop_print_frame = 0; | |
1740 | break; | |
1741 | } | |
1742 | if (stop_soon_quietly) | |
1743 | break; | |
1744 | ||
1745 | /* Don't even think about breakpoints | |
1746 | if just proceeded over a breakpoint. | |
1747 | ||
1748 | However, if we are trying to proceed over a breakpoint | |
bcc37718 | 1749 | and end up in sigtramp, then through_sigtramp_breakpoint |
bd5635a1 RP |
1750 | will be set and we should check whether we've hit the |
1751 | step breakpoint. */ | |
67ac9759 | 1752 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected |
bcc37718 | 1753 | && through_sigtramp_breakpoint == NULL) |
bd5635a1 RP |
1754 | bpstat_clear (&stop_bpstat); |
1755 | else | |
1756 | { | |
1757 | /* See if there is a breakpoint at the current PC. */ | |
cb6b0202 | 1758 | stop_bpstat = bpstat_stop_status |
479f0f18 | 1759 | (&stop_pc, |
4eb4b87e | 1760 | (DECR_PC_AFTER_BREAK ? |
cb6b0202 JK |
1761 | /* Notice the case of stepping through a jump |
1762 | that lands just after a breakpoint. | |
1763 | Don't confuse that with hitting the breakpoint. | |
1764 | What we check for is that 1) stepping is going on | |
1765 | and 2) the pc before the last insn does not match | |
f0fce3b8 JM |
1766 | the address of the breakpoint before the current pc |
1767 | and 3) we didn't hit a breakpoint in a signal handler | |
1768 | without an intervening stop in sigtramp, which is | |
1769 | detected by a new stack pointer value below | |
1770 | any usual function calling stack adjustments. */ | |
1771 | (CURRENTLY_STEPPING () | |
1772 | && prev_pc != stop_pc - DECR_PC_AFTER_BREAK | |
1773 | && !(step_range_end | |
65b07ddc | 1774 | && INNER_THAN (read_sp (), (step_sp - 16)))) : |
4eb4b87e | 1775 | 0) |
cb6b0202 JK |
1776 | ); |
1777 | /* Following in case break condition called a | |
1778 | function. */ | |
1779 | stop_print_frame = 1; | |
bd5635a1 | 1780 | } |
fe675038 | 1781 | |
67ac9759 | 1782 | if (stop_signal == TARGET_SIGNAL_TRAP) |
bd5635a1 RP |
1783 | random_signal |
1784 | = !(bpstat_explains_signal (stop_bpstat) | |
1785 | || trap_expected | |
84d59861 | 1786 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
479f0f18 SG |
1787 | || PC_IN_CALL_DUMMY (stop_pc, read_sp (), |
1788 | FRAME_FP (get_current_frame ())) | |
84d59861 | 1789 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
fe675038 | 1790 | || (step_range_end && step_resume_breakpoint == NULL)); |
65b07ddc | 1791 | |
bd5635a1 RP |
1792 | else |
1793 | { | |
1794 | random_signal | |
1795 | = !(bpstat_explains_signal (stop_bpstat) | |
bd5635a1 RP |
1796 | /* End of a stack dummy. Some systems (e.g. Sony |
1797 | news) give another signal besides SIGTRAP, | |
1798 | so check here as well as above. */ | |
84d59861 | 1799 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
479f0f18 SG |
1800 | || PC_IN_CALL_DUMMY (stop_pc, read_sp (), |
1801 | FRAME_FP (get_current_frame ())) | |
84d59861 | 1802 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
bd5635a1 RP |
1803 | ); |
1804 | if (!random_signal) | |
67ac9759 | 1805 | stop_signal = TARGET_SIGNAL_TRAP; |
bd5635a1 RP |
1806 | } |
1807 | } | |
65b07ddc DT |
1808 | |
1809 | /* When we reach this point, we've pretty much decided | |
1810 | that the reason for stopping must've been a random | |
1811 | (unexpected) signal. */ | |
1812 | ||
bd5635a1 RP |
1813 | else |
1814 | random_signal = 1; | |
65b07ddc DT |
1815 | /* If a fork, vfork or exec event was seen, then there are two |
1816 | possible responses we can make: | |
1817 | ||
1818 | 1. If a catchpoint triggers for the event (random_signal == 0), | |
1819 | then we must stop now and issue a prompt. We will resume | |
1820 | the inferior when the user tells us to. | |
1821 | 2. If no catchpoint triggers for the event (random_signal == 1), | |
1822 | then we must resume the inferior now and keep checking. | |
1823 | ||
1824 | In either case, we must take appropriate steps to "follow" the | |
1825 | the fork/vfork/exec when the inferior is resumed. For example, | |
1826 | if follow-fork-mode is "child", then we must detach from the | |
1827 | parent inferior and follow the new child inferior. | |
1828 | ||
1829 | In either case, setting pending_follow causes the next resume() | |
1830 | to take the appropriate following action. */ | |
1831 | process_event_stop_test: | |
1832 | if (w.kind == TARGET_WAITKIND_FORKED) | |
1833 | { | |
1834 | if (random_signal) /* I.e., no catchpoint triggered for this. */ | |
1835 | { | |
1836 | trap_expected = 1; | |
1837 | stop_signal = TARGET_SIGNAL_0; | |
1838 | goto keep_going; | |
1839 | } | |
1840 | } | |
1841 | else if (w.kind == TARGET_WAITKIND_VFORKED) | |
1842 | { | |
1843 | if (random_signal) /* I.e., no catchpoint triggered for this. */ | |
1844 | { | |
1845 | stop_signal = TARGET_SIGNAL_0; | |
1846 | goto keep_going; | |
1847 | } | |
1848 | } | |
1849 | else if (w.kind == TARGET_WAITKIND_EXECD) | |
1850 | { | |
1851 | pending_follow.kind = w.kind; | |
1852 | if (random_signal) /* I.e., no catchpoint triggered for this. */ | |
1853 | { | |
1854 | trap_expected = 1; | |
1855 | stop_signal = TARGET_SIGNAL_0; | |
1856 | goto keep_going; | |
1857 | } | |
1858 | } | |
fe675038 | 1859 | |
bd5635a1 RP |
1860 | /* For the program's own signals, act according to |
1861 | the signal handling tables. */ | |
fe675038 | 1862 | |
bd5635a1 RP |
1863 | if (random_signal) |
1864 | { | |
1865 | /* Signal not for debugging purposes. */ | |
1866 | int printed = 0; | |
1867 | ||
1868 | stopped_by_random_signal = 1; | |
1869 | ||
67ac9759 | 1870 | if (signal_print[stop_signal]) |
bd5635a1 RP |
1871 | { |
1872 | printed = 1; | |
1873 | target_terminal_ours_for_output (); | |
1c95d7ab JK |
1874 | annotate_signal (); |
1875 | printf_filtered ("\nProgram received signal "); | |
1876 | annotate_signal_name (); | |
1877 | printf_filtered ("%s", target_signal_to_name (stop_signal)); | |
1878 | annotate_signal_name_end (); | |
1879 | printf_filtered (", "); | |
1880 | annotate_signal_string (); | |
1881 | printf_filtered ("%s", target_signal_to_string (stop_signal)); | |
1882 | annotate_signal_string_end (); | |
1883 | printf_filtered (".\n"); | |
199b2450 | 1884 | gdb_flush (gdb_stdout); |
bd5635a1 | 1885 | } |
67ac9759 | 1886 | if (signal_stop[stop_signal]) |
bd5635a1 RP |
1887 | break; |
1888 | /* If not going to stop, give terminal back | |
1889 | if we took it away. */ | |
1890 | else if (printed) | |
1891 | target_terminal_inferior (); | |
b7f81b57 | 1892 | |
101b7f9c PS |
1893 | /* Clear the signal if it should not be passed. */ |
1894 | if (signal_program[stop_signal] == 0) | |
67ac9759 | 1895 | stop_signal = TARGET_SIGNAL_0; |
101b7f9c | 1896 | |
65b07ddc DT |
1897 | /* If we're in the middle of a "next" command, let the code for |
1898 | stepping over a function handle this. pai/1997-09-10 | |
1899 | ||
1900 | A previous comment here suggested it was possible to change | |
1901 | this to jump to keep_going in all cases. */ | |
1902 | ||
1903 | if (step_over_calls > 0) | |
1904 | goto step_over_function; | |
1905 | else | |
1906 | goto check_sigtramp2; | |
bd5635a1 | 1907 | } |
30875e1c | 1908 | |
bd5635a1 | 1909 | /* Handle cases caused by hitting a breakpoint. */ |
fe675038 JK |
1910 | { |
1911 | CORE_ADDR jmp_buf_pc; | |
29c6dce2 JK |
1912 | struct bpstat_what what; |
1913 | ||
1914 | what = bpstat_what (stop_bpstat); | |
bd5635a1 | 1915 | |
84d59861 JK |
1916 | if (what.call_dummy) |
1917 | { | |
1918 | stop_stack_dummy = 1; | |
1919 | #ifdef HP_OS_BUG | |
1920 | trap_expected_after_continue = 1; | |
1921 | #endif | |
1922 | } | |
1923 | ||
fe675038 JK |
1924 | switch (what.main_action) |
1925 | { | |
1926 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
1927 | /* If we hit the breakpoint at longjmp, disable it for the | |
1928 | duration of this command. Then, install a temporary | |
1929 | breakpoint at the target of the jmp_buf. */ | |
1930 | disable_longjmp_breakpoint(); | |
1931 | remove_breakpoints (); | |
1932 | breakpoints_inserted = 0; | |
1933 | if (!GET_LONGJMP_TARGET(&jmp_buf_pc)) goto keep_going; | |
1934 | ||
1935 | /* Need to blow away step-resume breakpoint, as it | |
1936 | interferes with us */ | |
1937 | if (step_resume_breakpoint != NULL) | |
1938 | { | |
1939 | delete_breakpoint (step_resume_breakpoint); | |
1940 | step_resume_breakpoint = NULL; | |
bcc37718 JK |
1941 | } |
1942 | /* Not sure whether we need to blow this away too, but probably | |
1943 | it is like the step-resume breakpoint. */ | |
1944 | if (through_sigtramp_breakpoint != NULL) | |
1945 | { | |
1946 | delete_breakpoint (through_sigtramp_breakpoint); | |
1947 | through_sigtramp_breakpoint = NULL; | |
fe675038 | 1948 | } |
30875e1c | 1949 | |
101b7f9c | 1950 | #if 0 |
fe675038 JK |
1951 | /* FIXME - Need to implement nested temporary breakpoints */ |
1952 | if (step_over_calls > 0) | |
1953 | set_longjmp_resume_breakpoint(jmp_buf_pc, | |
1954 | get_current_frame()); | |
1955 | else | |
30875e1c | 1956 | #endif /* 0 */ |
fe675038 JK |
1957 | set_longjmp_resume_breakpoint(jmp_buf_pc, NULL); |
1958 | handling_longjmp = 1; /* FIXME */ | |
1959 | goto keep_going; | |
1960 | ||
1961 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: | |
1962 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
1963 | remove_breakpoints (); | |
1964 | breakpoints_inserted = 0; | |
101b7f9c | 1965 | #if 0 |
fe675038 JK |
1966 | /* FIXME - Need to implement nested temporary breakpoints */ |
1967 | if (step_over_calls | |
65b07ddc DT |
1968 | && (INNER_THAN (FRAME_FP (get_current_frame ()), |
1969 | step_frame_address))) | |
fe675038 JK |
1970 | { |
1971 | another_trap = 1; | |
1972 | goto keep_going; | |
1973 | } | |
30875e1c | 1974 | #endif /* 0 */ |
fe675038 JK |
1975 | disable_longjmp_breakpoint(); |
1976 | handling_longjmp = 0; /* FIXME */ | |
1977 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
101b7f9c | 1978 | break; |
fe675038 JK |
1979 | /* else fallthrough */ |
1980 | ||
1981 | case BPSTAT_WHAT_SINGLE: | |
1982 | if (breakpoints_inserted) | |
65b07ddc DT |
1983 | { |
1984 | thread_step_needed = 1; | |
1985 | remove_breakpoints (); | |
1986 | } | |
fe675038 JK |
1987 | breakpoints_inserted = 0; |
1988 | another_trap = 1; | |
1989 | /* Still need to check other stuff, at least the case | |
1990 | where we are stepping and step out of the right range. */ | |
1991 | break; | |
1992 | ||
1993 | case BPSTAT_WHAT_STOP_NOISY: | |
1994 | stop_print_frame = 1; | |
bcc37718 JK |
1995 | |
1996 | /* We are about to nuke the step_resume_breakpoint and | |
1997 | through_sigtramp_breakpoint via the cleanup chain, so | |
1998 | no need to worry about it here. */ | |
1999 | ||
fe675038 | 2000 | goto stop_stepping; |
101b7f9c | 2001 | |
fe675038 JK |
2002 | case BPSTAT_WHAT_STOP_SILENT: |
2003 | stop_print_frame = 0; | |
fe675038 | 2004 | |
bcc37718 JK |
2005 | /* We are about to nuke the step_resume_breakpoint and |
2006 | through_sigtramp_breakpoint via the cleanup chain, so | |
2007 | no need to worry about it here. */ | |
100f92e2 | 2008 | |
bcc37718 | 2009 | goto stop_stepping; |
fe675038 | 2010 | |
bcc37718 | 2011 | case BPSTAT_WHAT_STEP_RESUME: |
65b07ddc DT |
2012 | /* This proably demands a more elegant solution, but, yeah |
2013 | right... | |
2014 | ||
1f205f9d MS |
2015 | This function's use of the simple variable |
2016 | step_resume_breakpoint doesn't seem to accomodate | |
2017 | simultaneously active step-resume bp's, although the | |
2018 | breakpoint list certainly can. | |
65b07ddc | 2019 | |
1f205f9d MS |
2020 | If we reach here and step_resume_breakpoint is already |
2021 | NULL, then apparently we have multiple active | |
2022 | step-resume bp's. We'll just delete the breakpoint we | |
2023 | stopped at, and carry on. */ | |
65b07ddc DT |
2024 | if (step_resume_breakpoint == NULL) |
2025 | { | |
2026 | step_resume_breakpoint = | |
2027 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2028 | } | |
fe675038 JK |
2029 | delete_breakpoint (step_resume_breakpoint); |
2030 | step_resume_breakpoint = NULL; | |
bcc37718 JK |
2031 | break; |
2032 | ||
2033 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
479f0f18 SG |
2034 | if (through_sigtramp_breakpoint) |
2035 | delete_breakpoint (through_sigtramp_breakpoint); | |
bcc37718 | 2036 | through_sigtramp_breakpoint = NULL; |
30875e1c | 2037 | |
fe675038 JK |
2038 | /* If were waiting for a trap, hitting the step_resume_break |
2039 | doesn't count as getting it. */ | |
2040 | if (trap_expected) | |
2041 | another_trap = 1; | |
bcc37718 JK |
2042 | break; |
2043 | ||
87273c71 | 2044 | case BPSTAT_WHAT_CHECK_SHLIBS: |
65b07ddc | 2045 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: |
b607efe7 | 2046 | #ifdef SOLIB_ADD |
87273c71 JL |
2047 | { |
2048 | extern int auto_solib_add; | |
2049 | ||
fa3764e2 JL |
2050 | /* Remove breakpoints, we eventually want to step over the |
2051 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2052 | breakpoint addresses via breakpoint_re_set. */ | |
2053 | if (breakpoints_inserted) | |
2054 | remove_breakpoints (); | |
2055 | breakpoints_inserted = 0; | |
2056 | ||
87273c71 JL |
2057 | /* Check for any newly added shared libraries if we're |
2058 | supposed to be adding them automatically. */ | |
2059 | if (auto_solib_add) | |
11be829f | 2060 | { |
11be829f JL |
2061 | /* Switch terminal for any messages produced by |
2062 | breakpoint_re_set. */ | |
2063 | target_terminal_ours_for_output (); | |
2064 | SOLIB_ADD (NULL, 0, NULL); | |
2065 | target_terminal_inferior (); | |
2066 | } | |
87273c71 | 2067 | |
4eb4b87e MA |
2068 | /* Try to reenable shared library breakpoints, additional |
2069 | code segments in shared libraries might be mapped in now. */ | |
2070 | re_enable_breakpoints_in_shlibs (); | |
2071 | ||
87273c71 JL |
2072 | /* If requested, stop when the dynamic linker notifies |
2073 | gdb of events. This allows the user to get control | |
2074 | and place breakpoints in initializer routines for | |
2075 | dynamically loaded objects (among other things). */ | |
2076 | if (stop_on_solib_events) | |
2077 | { | |
2078 | stop_print_frame = 0; | |
2079 | goto stop_stepping; | |
2080 | } | |
65b07ddc DT |
2081 | |
2082 | /* If we stopped due to an explicit catchpoint, then the | |
2083 | (see above) call to SOLIB_ADD pulled in any symbols | |
2084 | from a newly-loaded library, if appropriate. | |
2085 | ||
2086 | We do want the inferior to stop, but not where it is | |
2087 | now, which is in the dynamic linker callback. Rather, | |
2088 | we would like it stop in the user's program, just after | |
2089 | the call that caused this catchpoint to trigger. That | |
2090 | gives the user a more useful vantage from which to | |
2091 | examine their program's state. */ | |
2092 | else if (what.main_action == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
2093 | { | |
2094 | /* ??rehrauer: If I could figure out how to get the | |
2095 | right return PC from here, we could just set a temp | |
2096 | breakpoint and resume. I'm not sure we can without | |
2097 | cracking open the dld's shared libraries and sniffing | |
2098 | their unwind tables and text/data ranges, and that's | |
2099 | not a terribly portable notion. | |
2100 | ||
2101 | Until that time, we must step the inferior out of the | |
2102 | dld callback, and also out of the dld itself (and any | |
2103 | code or stubs in libdld.sl, such as "shl_load" and | |
2104 | friends) until we reach non-dld code. At that point, | |
2105 | we can stop stepping. */ | |
2106 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2107 | &stepping_through_solib_catchpoints); | |
2108 | stepping_through_solib_after_catch = 1; | |
2109 | ||
2110 | /* Be sure to lift all breakpoints, so the inferior does | |
2111 | actually step past this point... */ | |
2112 | another_trap = 1; | |
2113 | break; | |
2114 | } | |
87273c71 JL |
2115 | else |
2116 | { | |
2117 | /* We want to step over this breakpoint, then keep going. */ | |
2118 | another_trap = 1; | |
87273c71 JL |
2119 | break; |
2120 | } | |
2121 | } | |
2122 | #endif | |
b607efe7 | 2123 | break; |
87273c71 | 2124 | |
bcc37718 JK |
2125 | case BPSTAT_WHAT_LAST: |
2126 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
2127 | ||
2128 | case BPSTAT_WHAT_KEEP_CHECKING: | |
2129 | break; | |
30875e1c | 2130 | } |
fe675038 | 2131 | } |
30875e1c SG |
2132 | |
2133 | /* We come here if we hit a breakpoint but should not | |
2134 | stop for it. Possibly we also were stepping | |
2135 | and should stop for that. So fall through and | |
2136 | test for stepping. But, if not stepping, | |
2137 | do not stop. */ | |
2138 | ||
65b07ddc DT |
2139 | /* Are we stepping to get the inferior out of the dynamic |
2140 | linker's hook (and possibly the dld itself) after catching | |
2141 | a shlib event? */ | |
2142 | if (stepping_through_solib_after_catch) | |
2143 | { | |
2144 | #if defined(SOLIB_ADD) | |
2145 | /* Have we reached our destination? If not, keep going. */ | |
2146 | if (SOLIB_IN_DYNAMIC_LINKER (pid, stop_pc)) | |
2147 | { | |
2148 | another_trap = 1; | |
2149 | goto keep_going; | |
2150 | } | |
2151 | #endif | |
2152 | /* Else, stop and report the catchpoint(s) whose triggering | |
2153 | caused us to begin stepping. */ | |
2154 | stepping_through_solib_after_catch = 0; | |
2155 | bpstat_clear (&stop_bpstat); | |
2156 | stop_bpstat = bpstat_copy (stepping_through_solib_catchpoints); | |
2157 | bpstat_clear (&stepping_through_solib_catchpoints); | |
2158 | stop_print_frame = 1; | |
2159 | goto stop_stepping; | |
2160 | } | |
2161 | ||
84d59861 JK |
2162 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
2163 | /* This is the old way of detecting the end of the stack dummy. | |
2164 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
2165 | handled above. As soon as we can test it on all of them, all | |
2166 | architectures should define it. */ | |
2167 | ||
bd5635a1 | 2168 | /* If this is the breakpoint at the end of a stack dummy, |
c9de302b SG |
2169 | just stop silently, unless the user was doing an si/ni, in which |
2170 | case she'd better know what she's doing. */ | |
2171 | ||
1f205f9d MS |
2172 | if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (), |
2173 | FRAME_FP (get_current_frame ())) | |
c9de302b SG |
2174 | && !step_range_end) |
2175 | { | |
2176 | stop_print_frame = 0; | |
2177 | stop_stack_dummy = 1; | |
bd5635a1 | 2178 | #ifdef HP_OS_BUG |
c9de302b | 2179 | trap_expected_after_continue = 1; |
bd5635a1 | 2180 | #endif |
c9de302b SG |
2181 | break; |
2182 | } | |
84d59861 JK |
2183 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
2184 | ||
fe675038 | 2185 | if (step_resume_breakpoint) |
bd5635a1 RP |
2186 | /* Having a step-resume breakpoint overrides anything |
2187 | else having to do with stepping commands until | |
2188 | that breakpoint is reached. */ | |
bcc37718 JK |
2189 | /* I'm not sure whether this needs to be check_sigtramp2 or |
2190 | whether it could/should be keep_going. */ | |
fe675038 JK |
2191 | goto check_sigtramp2; |
2192 | ||
2193 | if (step_range_end == 0) | |
2194 | /* Likewise if we aren't even stepping. */ | |
2195 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2196 | whether it could/should be keep_going. */ | |
2197 | goto check_sigtramp2; | |
2198 | ||
65b07ddc DT |
2199 | /* If stepping through a line, keep going if still within it. |
2200 | ||
2201 | Note that step_range_end is the address of the first instruction | |
2202 | beyond the step range, and NOT the address of the last instruction | |
2203 | within it! */ | |
fe675038 JK |
2204 | if (stop_pc >= step_range_start |
2205 | && stop_pc < step_range_end | |
3f687c78 | 2206 | #if 0 |
1f205f9d MS |
2207 | /* I haven't a clue what might trigger this clause, and it seems wrong |
2208 | anyway, so I've disabled it until someone complains. -Stu 10/24/95 */ | |
3f687c78 | 2209 | |
fe675038 JK |
2210 | /* The step range might include the start of the |
2211 | function, so if we are at the start of the | |
2212 | step range and either the stack or frame pointers | |
2213 | just changed, we've stepped outside */ | |
2214 | && !(stop_pc == step_range_start | |
479f0f18 | 2215 | && FRAME_FP (get_current_frame ()) |
65b07ddc | 2216 | && (INNER_THAN (read_sp (), step_sp) |
3f687c78 SG |
2217 | || FRAME_FP (get_current_frame ()) != step_frame_address)) |
2218 | #endif | |
2219 | ) | |
bd5635a1 | 2220 | { |
fe675038 JK |
2221 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. |
2222 | So definately need to check for sigtramp here. */ | |
2223 | goto check_sigtramp2; | |
bd5635a1 | 2224 | } |
fe675038 | 2225 | |
479f0f18 SG |
2226 | /* We stepped out of the stepping range. */ |
2227 | ||
24a38525 DP |
2228 | /* If we are stepping at the source level and entered the runtime |
2229 | loader dynamic symbol resolution code, we keep on single stepping | |
2230 | until we exit the run time loader code and reach the callee's | |
2231 | address. */ | |
2232 | if (step_over_calls < 0 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2233 | goto keep_going; | |
2234 | ||
479f0f18 SG |
2235 | /* We can't update step_sp every time through the loop, because |
2236 | reading the stack pointer would slow down stepping too much. | |
2237 | But we can update it every time we leave the step range. */ | |
2238 | update_step_sp = 1; | |
fe675038 JK |
2239 | |
2240 | /* Did we just take a signal? */ | |
2241 | if (IN_SIGTRAMP (stop_pc, stop_func_name) | |
b607efe7 | 2242 | && !IN_SIGTRAMP (prev_pc, prev_func_name) |
65b07ddc | 2243 | && INNER_THAN (read_sp (), step_sp)) |
bd5635a1 | 2244 | { |
bcc37718 JK |
2245 | /* We've just taken a signal; go until we are back to |
2246 | the point where we took it and one more. */ | |
2247 | ||
65b07ddc DT |
2248 | /* Note: The test above succeeds not only when we stepped |
2249 | into a signal handler, but also when we step past the last | |
2250 | statement of a signal handler and end up in the return stub | |
2251 | of the signal handler trampoline. To distinguish between | |
2252 | these two cases, check that the frame is INNER_THAN the | |
2253 | previous one below. pai/1997-09-11 */ | |
bcc37718 | 2254 | |
bcc37718 | 2255 | |
fe675038 | 2256 | { |
1f205f9d | 2257 | CORE_ADDR current_frame = FRAME_FP (get_current_frame()); |
65b07ddc DT |
2258 | |
2259 | if (INNER_THAN (current_frame, step_frame_address)) | |
2260 | { | |
2261 | /* We have just taken a signal; go until we are back to | |
2262 | the point where we took it and one more. */ | |
2263 | ||
2264 | /* This code is needed at least in the following case: | |
2265 | The user types "next" and then a signal arrives (before | |
2266 | the "next" is done). */ | |
2267 | ||
2268 | /* Note that if we are stopped at a breakpoint, then we need | |
2269 | the step_resume breakpoint to override any breakpoints at | |
2270 | the same location, so that we will still step over the | |
2271 | breakpoint even though the signal happened. */ | |
2272 | struct symtab_and_line sr_sal; | |
2273 | ||
2274 | INIT_SAL(&sr_sal); | |
2275 | sr_sal.symtab = NULL; | |
2276 | sr_sal.line = 0; | |
2277 | sr_sal.pc = prev_pc; | |
2278 | /* We could probably be setting the frame to | |
1f205f9d MS |
2279 | step_frame_address; I don't think anyone thought to |
2280 | try it. */ | |
65b07ddc DT |
2281 | step_resume_breakpoint = |
2282 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2283 | if (breakpoints_inserted) | |
2284 | insert_breakpoints (); | |
2285 | } | |
2286 | else | |
2287 | { | |
1f205f9d MS |
2288 | /* We just stepped out of a signal handler and into |
2289 | its calling trampoline. | |
2290 | ||
2291 | Normally, we'd jump to step_over_function from | |
2292 | here, but for some reason GDB can't unwind the | |
2293 | stack correctly to find the real PC for the point | |
2294 | user code where the signal trampoline will return | |
2295 | -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. | |
2296 | But signal trampolines are pretty small stubs of | |
2297 | code, anyway, so it's OK instead to just | |
2298 | single-step out. Note: assuming such trampolines | |
2299 | don't exhibit recursion on any platform... */ | |
2300 | find_pc_partial_function (stop_pc, &stop_func_name, | |
2301 | &stop_func_start, | |
2302 | &stop_func_end); | |
65b07ddc DT |
2303 | /* Readjust stepping range */ |
2304 | step_range_start = stop_func_start; | |
2305 | step_range_end = stop_func_end; | |
2306 | stepping_through_sigtramp = 1; | |
2307 | } | |
fe675038 | 2308 | } |
bd5635a1 | 2309 | |
65b07ddc | 2310 | |
fe675038 JK |
2311 | /* If this is stepi or nexti, make sure that the stepping range |
2312 | gets us past that instruction. */ | |
2313 | if (step_range_end == 1) | |
2314 | /* FIXME: Does this run afoul of the code below which, if | |
2315 | we step into the middle of a line, resets the stepping | |
2316 | range? */ | |
2317 | step_range_end = (step_range_start = prev_pc) + 1; | |
101b7f9c | 2318 | |
fe675038 JK |
2319 | remove_breakpoints_on_following_step = 1; |
2320 | goto keep_going; | |
2321 | } | |
30875e1c | 2322 | |
3f687c78 | 2323 | #if 0 |
1f205f9d MS |
2324 | /* I disabled this test because it was too complicated and slow. |
2325 | The SKIP_PROLOGUE was especially slow, because it caused | |
2326 | unnecessary prologue examination on various architectures. | |
2327 | The code in the #else clause has been tested on the Sparc, | |
2328 | Mips, PA, and Power architectures, so it's pretty likely to | |
2329 | be correct. -Stu 10/24/95 */ | |
3f687c78 | 2330 | |
479f0f18 SG |
2331 | /* See if we left the step range due to a subroutine call that |
2332 | we should proceed to the end of. */ | |
2333 | ||
fe675038 JK |
2334 | if (stop_func_start) |
2335 | { | |
320f93f7 SG |
2336 | struct symtab *s; |
2337 | ||
fe675038 JK |
2338 | /* Do this after the IN_SIGTRAMP check; it might give |
2339 | an error. */ | |
2340 | prologue_pc = stop_func_start; | |
320f93f7 SG |
2341 | |
2342 | /* Don't skip the prologue if this is assembly source */ | |
2343 | s = find_pc_symtab (stop_pc); | |
2344 | if (s && s->language != language_asm) | |
2345 | SKIP_PROLOGUE (prologue_pc); | |
fe675038 | 2346 | } |
30875e1c | 2347 | |
1f205f9d MS |
2348 | if (!(INNER_THAN (step_sp, read_sp ())) /* don't mistake (sig)return |
2349 | as a call */ | |
b607efe7 FF |
2350 | && (/* Might be a non-recursive call. If the symbols are missing |
2351 | enough that stop_func_start == prev_func_start even though | |
2352 | they are really two functions, we will treat some calls as | |
2353 | jumps. */ | |
2354 | stop_func_start != prev_func_start | |
2355 | ||
2356 | /* Might be a recursive call if either we have a prologue | |
2357 | or the call instruction itself saves the PC on the stack. */ | |
2358 | || prologue_pc != stop_func_start | |
2359 | || read_sp () != step_sp) | |
199b2450 TL |
2360 | && (/* PC is completely out of bounds of any known objfiles. Treat |
2361 | like a subroutine call. */ | |
2362 | ! stop_func_start | |
c0c14c1e | 2363 | |
f1619234 | 2364 | /* If we do a call, we will be at the start of a function... */ |
c0c14c1e | 2365 | || stop_pc == stop_func_start |
f1619234 JK |
2366 | |
2367 | /* ...except on the Alpha with -O (and also Irix 5 and | |
2368 | perhaps others), in which we might call the address | |
2369 | after the load of gp. Since prologues don't contain | |
2370 | calls, we can't return to within one, and we don't | |
2371 | jump back into them, so this check is OK. */ | |
c0c14c1e | 2372 | |
c0c14c1e | 2373 | || stop_pc < prologue_pc |
d747e0af | 2374 | |
479f0f18 SG |
2375 | /* ...and if it is a leaf function, the prologue might |
2376 | consist of gp loading only, so the call transfers to | |
2377 | the first instruction after the prologue. */ | |
2378 | || (stop_pc == prologue_pc | |
2379 | ||
2380 | /* Distinguish this from the case where we jump back | |
2381 | to the first instruction after the prologue, | |
2382 | within a function. */ | |
2383 | && stop_func_start != prev_func_start) | |
2384 | ||
c0c14c1e JK |
2385 | /* If we end up in certain places, it means we did a subroutine |
2386 | call. I'm not completely sure this is necessary now that we | |
2387 | have the above checks with stop_func_start (and now that | |
100f92e2 | 2388 | find_pc_partial_function is pickier). */ |
4cc1b3f7 | 2389 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, stop_func_name) |
c0c14c1e JK |
2390 | |
2391 | /* If none of the above apply, it is a jump within a function, | |
2392 | or a return from a subroutine. The other case is longjmp, | |
2393 | which can no longer happen here as long as the | |
2394 | handling_longjmp stuff is working. */ | |
2395 | )) | |
320f93f7 | 2396 | #else |
87273c71 JL |
2397 | /* This test is a much more streamlined, (but hopefully correct) |
2398 | replacement for the code above. It's been tested on the Sparc, | |
2399 | Mips, PA, and Power architectures with good results. */ | |
320f93f7 | 2400 | |
3f687c78 | 2401 | if (stop_pc == stop_func_start /* Quick test */ |
65b07ddc DT |
2402 | || (in_prologue (stop_pc, stop_func_start) && |
2403 | ! IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, stop_func_name)) | |
3f687c78 | 2404 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, stop_func_name) |
02331869 | 2405 | || stop_func_name == 0) |
320f93f7 | 2406 | #endif |
3f687c78 | 2407 | |
fe675038 JK |
2408 | { |
2409 | /* It's a subroutine call. */ | |
fee44494 | 2410 | |
fe675038 JK |
2411 | if (step_over_calls == 0) |
2412 | { | |
2413 | /* I presume that step_over_calls is only 0 when we're | |
2414 | supposed to be stepping at the assembly language level | |
2415 | ("stepi"). Just stop. */ | |
2416 | stop_step = 1; | |
2417 | break; | |
2418 | } | |
fee44494 | 2419 | |
4eb4b87e | 2420 | if (step_over_calls > 0 || IGNORE_HELPER_CALL (stop_pc)) |
fe675038 JK |
2421 | /* We're doing a "next". */ |
2422 | goto step_over_function; | |
2423 | ||
2424 | /* If we are in a function call trampoline (a stub between | |
2425 | the calling routine and the real function), locate the real | |
2426 | function. That's what tells us (a) whether we want to step | |
2427 | into it at all, and (b) what prologue we want to run to | |
2428 | the end of, if we do step into it. */ | |
2429 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2430 | if (tmp != 0) | |
2431 | stop_func_start = tmp; | |
87273c71 JL |
2432 | else |
2433 | { | |
2434 | tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); | |
2435 | if (tmp) | |
2436 | { | |
2437 | struct symtab_and_line xxx; | |
4eb4b87e MA |
2438 | /* Why isn't this s_a_l called "sr_sal", like all of the |
2439 | other s_a_l's where this code is duplicated? */ | |
2440 | INIT_SAL (&xxx); /* initialize to zeroes */ | |
24a38525 DP |
2441 | xxx.pc = tmp; |
2442 | xxx.section = find_pc_overlay (xxx.pc); | |
87273c71 JL |
2443 | step_resume_breakpoint = |
2444 | set_momentary_breakpoint (xxx, NULL, bp_step_resume); | |
2445 | insert_breakpoints (); | |
2446 | goto keep_going; | |
2447 | } | |
2448 | } | |
fe675038 JK |
2449 | |
2450 | /* If we have line number information for the function we | |
2451 | are thinking of stepping into, step into it. | |
2452 | ||
2453 | If there are several symtabs at that PC (e.g. with include | |
2454 | files), just want to know whether *any* of them have line | |
2455 | numbers. find_pc_line handles this. */ | |
2456 | { | |
2457 | struct symtab_and_line tmp_sal; | |
2458 | ||
2459 | tmp_sal = find_pc_line (stop_func_start, 0); | |
2460 | if (tmp_sal.line != 0) | |
2461 | goto step_into_function; | |
2462 | } | |
d747e0af MT |
2463 | |
2464 | step_over_function: | |
fe675038 JK |
2465 | /* A subroutine call has happened. */ |
2466 | { | |
2467 | /* Set a special breakpoint after the return */ | |
2468 | struct symtab_and_line sr_sal; | |
4eb4b87e | 2469 | |
65b07ddc DT |
2470 | INIT_SAL(&sr_sal); |
2471 | sr_sal.symtab = NULL; | |
2472 | sr_sal.line = 0; | |
2473 | ||
2474 | /* If we came here after encountering a signal in the middle of | |
2475 | a "next", use the stashed-away previous frame pc */ | |
2476 | sr_sal.pc | |
2477 | = stopped_by_random_signal | |
2478 | ? prev_pc | |
2479 | : ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
2480 | ||
2481 | step_resume_breakpoint = | |
2482 | set_momentary_breakpoint (sr_sal, | |
1f205f9d MS |
2483 | stopped_by_random_signal ? |
2484 | NULL : get_current_frame (), | |
65b07ddc DT |
2485 | bp_step_resume); |
2486 | ||
2487 | /* We've just entered a callee, and we wish to resume until | |
2488 | it returns to the caller. Setting a step_resume bp on | |
2489 | the return PC will catch a return from the callee. | |
2490 | ||
1f205f9d MS |
2491 | However, if the callee is recursing, we want to be |
2492 | careful not to catch returns of those recursive calls, | |
2493 | but of THIS instance of the call. | |
65b07ddc | 2494 | |
1f205f9d MS |
2495 | To do this, we set the step_resume bp's frame to our |
2496 | current caller's frame (step_frame_address, which is | |
2497 | set by the "next" or "until" command, before execution | |
2498 | begins). | |
65b07ddc | 2499 | |
1f205f9d MS |
2500 | But ... don't do it if we're single-stepping out of a |
2501 | sigtramp, because the reason we're single-stepping is | |
2502 | precisely because unwinding is a problem (HP-UX 10.20, | |
2503 | e.g.) and the frame address is likely to be incorrect. | |
2504 | No danger of sigtramp recursion. */ | |
65b07ddc DT |
2505 | |
2506 | if (stepping_through_sigtramp) | |
2507 | { | |
1f205f9d | 2508 | step_resume_breakpoint->frame = (CORE_ADDR) NULL; |
65b07ddc DT |
2509 | stepping_through_sigtramp = 0; |
2510 | } | |
2511 | else if (!IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) | |
2512 | step_resume_breakpoint->frame = step_frame_address; | |
2513 | ||
fe675038 JK |
2514 | if (breakpoints_inserted) |
2515 | insert_breakpoints (); | |
2516 | } | |
2517 | goto keep_going; | |
d747e0af MT |
2518 | |
2519 | step_into_function: | |
fe675038 JK |
2520 | /* Subroutine call with source code we should not step over. |
2521 | Do step to the first line of code in it. */ | |
320f93f7 SG |
2522 | { |
2523 | struct symtab *s; | |
2524 | ||
2525 | s = find_pc_symtab (stop_pc); | |
2526 | if (s && s->language != language_asm) | |
2527 | SKIP_PROLOGUE (stop_func_start); | |
2528 | } | |
fe675038 JK |
2529 | sal = find_pc_line (stop_func_start, 0); |
2530 | /* Use the step_resume_break to step until | |
2531 | the end of the prologue, even if that involves jumps | |
2532 | (as it seems to on the vax under 4.2). */ | |
2533 | /* If the prologue ends in the middle of a source line, | |
67ac9759 JK |
2534 | continue to the end of that source line (if it is still |
2535 | within the function). Otherwise, just go to end of prologue. */ | |
bd5635a1 | 2536 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP |
fe675038 JK |
2537 | /* no, don't either. It skips any code that's |
2538 | legitimately on the first line. */ | |
bd5635a1 | 2539 | #else |
67ac9759 | 2540 | if (sal.end && sal.pc != stop_func_start && sal.end < stop_func_end) |
fe675038 | 2541 | stop_func_start = sal.end; |
bd5635a1 | 2542 | #endif |
d747e0af | 2543 | |
fe675038 JK |
2544 | if (stop_func_start == stop_pc) |
2545 | { | |
2546 | /* We are already there: stop now. */ | |
2547 | stop_step = 1; | |
2548 | break; | |
2549 | } | |
2550 | else | |
2551 | /* Put the step-breakpoint there and go until there. */ | |
2552 | { | |
2553 | struct symtab_and_line sr_sal; | |
2554 | ||
4eb4b87e | 2555 | INIT_SAL (&sr_sal); /* initialize to zeroes */ |
24a38525 DP |
2556 | sr_sal.pc = stop_func_start; |
2557 | sr_sal.section = find_pc_overlay (stop_func_start); | |
fe675038 JK |
2558 | /* Do not specify what the fp should be when we stop |
2559 | since on some machines the prologue | |
2560 | is where the new fp value is established. */ | |
2561 | step_resume_breakpoint = | |
84d59861 | 2562 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); |
fe675038 JK |
2563 | if (breakpoints_inserted) |
2564 | insert_breakpoints (); | |
2565 | ||
2566 | /* And make sure stepping stops right away then. */ | |
2567 | step_range_end = step_range_start; | |
bd5635a1 | 2568 | } |
fe675038 JK |
2569 | goto keep_going; |
2570 | } | |
d747e0af | 2571 | |
b2f03c30 | 2572 | /* We've wandered out of the step range. */ |
d747e0af | 2573 | |
fe675038 | 2574 | sal = find_pc_line(stop_pc, 0); |
65b07ddc | 2575 | |
fe675038 JK |
2576 | if (step_range_end == 1) |
2577 | { | |
2578 | /* It is stepi or nexti. We always want to stop stepping after | |
2579 | one instruction. */ | |
2580 | stop_step = 1; | |
2581 | break; | |
2582 | } | |
2583 | ||
4cc1b3f7 JK |
2584 | /* If we're in the return path from a shared library trampoline, |
2585 | we want to proceed through the trampoline when stepping. */ | |
2586 | if (IN_SOLIB_RETURN_TRAMPOLINE(stop_pc, stop_func_name)) | |
2587 | { | |
2588 | CORE_ADDR tmp; | |
2589 | ||
2590 | /* Determine where this trampoline returns. */ | |
2591 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2592 | ||
2593 | /* Only proceed through if we know where it's going. */ | |
2594 | if (tmp) | |
2595 | { | |
2596 | /* And put the step-breakpoint there and go until there. */ | |
2597 | struct symtab_and_line sr_sal; | |
2598 | ||
4eb4b87e | 2599 | INIT_SAL (&sr_sal); /* initialize to zeroes */ |
24a38525 DP |
2600 | sr_sal.pc = tmp; |
2601 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
4cc1b3f7 JK |
2602 | /* Do not specify what the fp should be when we stop |
2603 | since on some machines the prologue | |
2604 | is where the new fp value is established. */ | |
2605 | step_resume_breakpoint = | |
2606 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2607 | if (breakpoints_inserted) | |
2608 | insert_breakpoints (); | |
2609 | ||
2610 | /* Restart without fiddling with the step ranges or | |
2611 | other state. */ | |
2612 | goto keep_going; | |
2613 | } | |
2614 | } | |
2615 | ||
fe675038 JK |
2616 | if (sal.line == 0) |
2617 | { | |
2618 | /* We have no line number information. That means to stop | |
2619 | stepping (does this always happen right after one instruction, | |
2620 | when we do "s" in a function with no line numbers, | |
2621 | or can this happen as a result of a return or longjmp?). */ | |
2622 | stop_step = 1; | |
2623 | break; | |
2624 | } | |
2625 | ||
65b07ddc | 2626 | if ((stop_pc == sal.pc) |
b2f03c30 | 2627 | && (current_line != sal.line || current_symtab != sal.symtab)) |
fe675038 JK |
2628 | { |
2629 | /* We are at the start of a different line. So stop. Note that | |
2630 | we don't stop if we step into the middle of a different line. | |
2631 | That is said to make things like for (;;) statements work | |
2632 | better. */ | |
2633 | stop_step = 1; | |
2634 | break; | |
bd5635a1 RP |
2635 | } |
2636 | ||
fe675038 JK |
2637 | /* We aren't done stepping. |
2638 | ||
2639 | Optimize by setting the stepping range to the line. | |
2640 | (We might not be in the original line, but if we entered a | |
2641 | new line in mid-statement, we continue stepping. This makes | |
2642 | things like for(;;) statements work better.) */ | |
67ac9759 JK |
2643 | |
2644 | if (stop_func_end && sal.end >= stop_func_end) | |
2645 | { | |
2646 | /* If this is the last line of the function, don't keep stepping | |
2647 | (it would probably step us out of the function). | |
2648 | This is particularly necessary for a one-line function, | |
2649 | in which after skipping the prologue we better stop even though | |
2650 | we will be in mid-line. */ | |
2651 | stop_step = 1; | |
2652 | break; | |
2653 | } | |
fe675038 JK |
2654 | step_range_start = sal.pc; |
2655 | step_range_end = sal.end; | |
b607efe7 | 2656 | step_frame_address = FRAME_FP (get_current_frame ()); |
4eb4b87e MA |
2657 | current_line = sal.line; |
2658 | current_symtab = sal.symtab; | |
65b07ddc DT |
2659 | |
2660 | /* In the case where we just stepped out of a function into the middle | |
2661 | of a line of the caller, continue stepping, but step_frame_address | |
2662 | must be modified to current frame */ | |
2663 | { | |
2664 | CORE_ADDR current_frame = FRAME_FP (get_current_frame()); | |
2665 | if (!(INNER_THAN (current_frame, step_frame_address))) | |
2666 | step_frame_address = current_frame; | |
2667 | } | |
2668 | ||
2669 | ||
fe675038 JK |
2670 | goto keep_going; |
2671 | ||
2672 | check_sigtramp2: | |
d747e0af MT |
2673 | if (trap_expected |
2674 | && IN_SIGTRAMP (stop_pc, stop_func_name) | |
b607efe7 | 2675 | && !IN_SIGTRAMP (prev_pc, prev_func_name) |
65b07ddc | 2676 | && INNER_THAN (read_sp (), step_sp)) |
bd5635a1 RP |
2677 | { |
2678 | /* What has happened here is that we have just stepped the inferior | |
2679 | with a signal (because it is a signal which shouldn't make | |
2680 | us stop), thus stepping into sigtramp. | |
2681 | ||
2682 | So we need to set a step_resume_break_address breakpoint | |
fe675038 JK |
2683 | and continue until we hit it, and then step. FIXME: This should |
2684 | be more enduring than a step_resume breakpoint; we should know | |
2685 | that we will later need to keep going rather than re-hitting | |
2686 | the breakpoint here (see testsuite/gdb.t06/signals.exp where | |
2687 | it says "exceedingly difficult"). */ | |
2688 | struct symtab_and_line sr_sal; | |
2689 | ||
4eb4b87e | 2690 | INIT_SAL (&sr_sal); /* initialize to zeroes */ |
24a38525 DP |
2691 | sr_sal.pc = prev_pc; |
2692 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
bcc37718 JK |
2693 | /* We perhaps could set the frame if we kept track of what |
2694 | the frame corresponding to prev_pc was. But we don't, | |
2695 | so don't. */ | |
2696 | through_sigtramp_breakpoint = | |
2697 | set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp); | |
bd5635a1 | 2698 | if (breakpoints_inserted) |
fe675038 JK |
2699 | insert_breakpoints (); |
2700 | ||
bd5635a1 RP |
2701 | remove_breakpoints_on_following_step = 1; |
2702 | another_trap = 1; | |
2703 | } | |
2704 | ||
30875e1c | 2705 | keep_going: |
fe675038 JK |
2706 | /* Come to this label when you need to resume the inferior. |
2707 | It's really much cleaner to do a goto than a maze of if-else | |
2708 | conditions. */ | |
30875e1c | 2709 | |
65b07ddc DT |
2710 | /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug |
2711 | a vforked child beetween its creation and subsequent exit or | |
2712 | call to exec(). However, I had big problems in this rather | |
2713 | creaky exec engine, getting that to work. The fundamental | |
2714 | problem is that I'm trying to debug two processes via an | |
2715 | engine that only understands a single process with possibly | |
2716 | multiple threads. | |
2717 | ||
2718 | Hence, this spot is known to have problems when | |
2719 | target_can_follow_vfork_prior_to_exec returns 1. */ | |
2720 | ||
bd5635a1 RP |
2721 | /* Save the pc before execution, to compare with pc after stop. */ |
2722 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
2723 | prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER | |
2724 | BREAK is defined, the | |
2725 | original pc would not have | |
2726 | been at the start of a | |
2727 | function. */ | |
2728 | prev_func_name = stop_func_name; | |
479f0f18 SG |
2729 | |
2730 | if (update_step_sp) | |
2731 | step_sp = read_sp (); | |
2732 | update_step_sp = 0; | |
bd5635a1 RP |
2733 | |
2734 | /* If we did not do break;, it means we should keep | |
2735 | running the inferior and not return to debugger. */ | |
2736 | ||
67ac9759 | 2737 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) |
bd5635a1 RP |
2738 | { |
2739 | /* We took a signal (which we are supposed to pass through to | |
2740 | the inferior, else we'd have done a break above) and we | |
2741 | haven't yet gotten our trap. Simply continue. */ | |
cb6b0202 | 2742 | resume (CURRENTLY_STEPPING (), stop_signal); |
bd5635a1 RP |
2743 | } |
2744 | else | |
2745 | { | |
2746 | /* Either the trap was not expected, but we are continuing | |
2747 | anyway (the user asked that this signal be passed to the | |
2748 | child) | |
2749 | -- or -- | |
2750 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2751 | decided we should resume from it. | |
2752 | ||
2753 | We're going to run this baby now! | |
2754 | ||
2755 | Insert breakpoints now, unless we are trying | |
2756 | to one-proceed past a breakpoint. */ | |
2757 | /* If we've just finished a special step resume and we don't | |
2758 | want to hit a breakpoint, pull em out. */ | |
d1c0c6cf JK |
2759 | if (step_resume_breakpoint == NULL |
2760 | && through_sigtramp_breakpoint == NULL | |
2761 | && remove_breakpoints_on_following_step) | |
bd5635a1 RP |
2762 | { |
2763 | remove_breakpoints_on_following_step = 0; | |
2764 | remove_breakpoints (); | |
2765 | breakpoints_inserted = 0; | |
2766 | } | |
2767 | else if (!breakpoints_inserted && | |
bcc37718 | 2768 | (through_sigtramp_breakpoint != NULL || !another_trap)) |
bd5635a1 | 2769 | { |
bd5635a1 RP |
2770 | breakpoints_failed = insert_breakpoints (); |
2771 | if (breakpoints_failed) | |
2772 | break; | |
2773 | breakpoints_inserted = 1; | |
2774 | } | |
2775 | ||
2776 | trap_expected = another_trap; | |
2777 | ||
67ac9759 JK |
2778 | if (stop_signal == TARGET_SIGNAL_TRAP) |
2779 | stop_signal = TARGET_SIGNAL_0; | |
bd5635a1 RP |
2780 | |
2781 | #ifdef SHIFT_INST_REGS | |
1f205f9d MS |
2782 | /* I'm not sure when this following segment applies. I do know, |
2783 | now, that we shouldn't rewrite the regs when we were stopped | |
2784 | by a random signal from the inferior process. */ | |
cef4c2e7 PS |
2785 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? |
2786 | (this is only used on the 88k). */ | |
bd5635a1 | 2787 | |
d11c44f1 | 2788 | if (!bpstat_explains_signal (stop_bpstat) |
67ac9759 | 2789 | && (stop_signal != TARGET_SIGNAL_CHLD) |
bd5635a1 | 2790 | && !stopped_by_random_signal) |
07a5991a | 2791 | SHIFT_INST_REGS(); |
bd5635a1 RP |
2792 | #endif /* SHIFT_INST_REGS */ |
2793 | ||
cb6b0202 | 2794 | resume (CURRENTLY_STEPPING (), stop_signal); |
bd5635a1 RP |
2795 | } |
2796 | } | |
30875e1c SG |
2797 | |
2798 | stop_stepping: | |
bd5635a1 RP |
2799 | if (target_has_execution) |
2800 | { | |
65b07ddc DT |
2801 | /* Are we stopping for a vfork event? We only stop when we see |
2802 | the child's event. However, we may not yet have seen the | |
2803 | parent's event. And, inferior_pid is still set to the parent's | |
2804 | pid, until we resume again and follow either the parent or child. | |
2805 | ||
2806 | To ensure that we can really touch inferior_pid (aka, the | |
2807 | parent process) -- which calls to functions like read_pc | |
2808 | implicitly do -- wait on the parent if necessary. */ | |
2809 | if ((pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
2810 | && ! pending_follow.fork_event.saw_parent_fork) | |
2811 | { | |
2812 | int parent_pid; | |
2813 | ||
2814 | do { | |
2815 | if (target_wait_hook) | |
2816 | parent_pid = target_wait_hook (-1, &w); | |
2817 | else | |
2818 | parent_pid = target_wait (-1, &w); | |
2819 | } while (parent_pid != inferior_pid); | |
2820 | } | |
2821 | ||
2822 | ||
bd5635a1 RP |
2823 | /* Assuming the inferior still exists, set these up for next |
2824 | time, just like we did above if we didn't break out of the | |
2825 | loop. */ | |
2826 | prev_pc = read_pc (); | |
2827 | prev_func_start = stop_func_start; | |
2828 | prev_func_name = stop_func_name; | |
bd5635a1 | 2829 | } |
fe675038 | 2830 | do_cleanups (old_cleanups); |
bd5635a1 | 2831 | } |
65b07ddc DT |
2832 | |
2833 | /* This function returns TRUE if ep is an internal breakpoint | |
2834 | set to catch generic shared library (aka dynamically-linked | |
2835 | library) events. (This is *NOT* the same as a catchpoint for a | |
2836 | shlib event. The latter is something a user can set; this is | |
2837 | something gdb sets for its own use, and isn't ever shown to a | |
2838 | user.) */ | |
2839 | static int | |
2840 | is_internal_shlib_eventpoint (ep) | |
2841 | struct breakpoint * ep; | |
2842 | { | |
2843 | return | |
2844 | (ep->type == bp_shlib_event) | |
2845 | ; | |
2846 | } | |
2847 | ||
2848 | /* This function returns TRUE if bs indicates that the inferior | |
2849 | stopped due to a shared library (aka dynamically-linked library) | |
2850 | event. */ | |
2851 | static int | |
2852 | stopped_for_internal_shlib_event (bs) | |
2853 | bpstat bs; | |
2854 | { | |
2855 | /* Note that multiple eventpoints may've caused the stop. Any | |
2856 | that are associated with shlib events will be accepted. */ | |
2857 | for (;bs != NULL; bs = bs->next) | |
2858 | { | |
2859 | if ((bs->breakpoint_at != NULL) | |
2860 | && is_internal_shlib_eventpoint (bs->breakpoint_at)) | |
2861 | return 1; | |
2862 | } | |
2863 | ||
2864 | /* If we get here, then no candidate was found. */ | |
2865 | return 0; | |
2866 | } | |
2867 | ||
2868 | /* This function returns TRUE if bs indicates that the inferior | |
2869 | stopped due to a shared library (aka dynamically-linked library) | |
2870 | event caught by a catchpoint. | |
2871 | ||
2872 | If TRUE, cp_p is set to point to the catchpoint. | |
2873 | ||
2874 | Else, the value of cp_p is undefined. */ | |
2875 | static int | |
2876 | stopped_for_shlib_catchpoint (bs, cp_p) | |
2877 | bpstat bs; | |
2878 | struct breakpoint ** cp_p; | |
2879 | { | |
2880 | /* Note that multiple eventpoints may've caused the stop. Any | |
2881 | that are associated with shlib events will be accepted. */ | |
2882 | *cp_p = NULL; | |
2883 | ||
2884 | for (;bs != NULL; bs = bs->next) | |
2885 | { | |
2886 | if ((bs->breakpoint_at != NULL) | |
2887 | && ep_is_shlib_catchpoint (bs->breakpoint_at)) | |
2888 | { | |
2889 | *cp_p = bs->breakpoint_at; | |
2890 | return 1; | |
2891 | } | |
2892 | } | |
2893 | ||
2894 | /* If we get here, then no candidate was found. */ | |
2895 | return 0; | |
2896 | } | |
2897 | ||
bd5635a1 RP |
2898 | \f |
2899 | /* Here to return control to GDB when the inferior stops for real. | |
2900 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
2901 | ||
2902 | STOP_PRINT_FRAME nonzero means print the executing frame | |
2903 | (pc, function, args, file, line number and line text). | |
2904 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
2905 | attempting to insert breakpoints. */ | |
2906 | ||
2907 | void | |
2908 | normal_stop () | |
2909 | { | |
65b07ddc DT |
2910 | |
2911 | #ifdef HPUXHPPA | |
2912 | /* As with the notification of thread events, we want to delay | |
2913 | notifying the user that we've switched thread context until | |
2914 | the inferior actually stops. | |
2915 | ||
2916 | (Note that there's no point in saying anything if the inferior | |
2917 | has exited!) */ | |
2918 | if ((switched_from_inferior_pid != inferior_pid) && | |
2919 | target_has_execution) | |
2920 | { | |
2921 | target_terminal_ours_for_output (); | |
1f205f9d MS |
2922 | printf_filtered ("[Switched to %s]\n", |
2923 | target_pid_or_tid_to_str (inferior_pid)); | |
65b07ddc DT |
2924 | switched_from_inferior_pid = inferior_pid; |
2925 | } | |
2926 | #endif | |
2927 | ||
bd5635a1 RP |
2928 | /* Make sure that the current_frame's pc is correct. This |
2929 | is a correction for setting up the frame info before doing | |
2930 | DECR_PC_AFTER_BREAK */ | |
3f0184ac | 2931 | if (target_has_execution && get_current_frame()) |
bd5635a1 RP |
2932 | (get_current_frame ())->pc = read_pc (); |
2933 | ||
2934 | if (breakpoints_failed) | |
2935 | { | |
2936 | target_terminal_ours_for_output (); | |
2937 | print_sys_errmsg ("ptrace", breakpoints_failed); | |
e37a6e9c | 2938 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
bd5635a1 RP |
2939 | The same program may be running in another process.\n"); |
2940 | } | |
2941 | ||
bd5635a1 | 2942 | if (target_has_execution && breakpoints_inserted) |
65b07ddc | 2943 | { |
bd5635a1 RP |
2944 | if (remove_breakpoints ()) |
2945 | { | |
2946 | target_terminal_ours_for_output (); | |
1f205f9d MS |
2947 | printf_filtered ("Cannot remove breakpoints because "); |
2948 | printf_filtered ("program is no longer writable.\n"); | |
2949 | printf_filtered ("It might be running in another process.\n"); | |
2950 | printf_filtered ("Further execution is probably impossible.\n"); | |
bd5635a1 | 2951 | } |
65b07ddc | 2952 | } |
bd5635a1 RP |
2953 | breakpoints_inserted = 0; |
2954 | ||
2955 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
2956 | Delete any breakpoint that is to be deleted at the next stop. */ | |
2957 | ||
2958 | breakpoint_auto_delete (stop_bpstat); | |
2959 | ||
2960 | /* If an auto-display called a function and that got a signal, | |
2961 | delete that auto-display to avoid an infinite recursion. */ | |
2962 | ||
2963 | if (stopped_by_random_signal) | |
2964 | disable_current_display (); | |
2965 | ||
65b07ddc DT |
2966 | /* Don't print a message if in the middle of doing a "step n" |
2967 | operation for n > 1 */ | |
bd5635a1 | 2968 | if (step_multi && stop_step) |
1c95d7ab | 2969 | goto done; |
bd5635a1 RP |
2970 | |
2971 | target_terminal_ours (); | |
2972 | ||
65b07ddc DT |
2973 | /* Did we stop because the user set the stop_on_solib_events |
2974 | variable? (If so, we report this as a generic, "Stopped due | |
2975 | to shlib event" message.) */ | |
2976 | if (stopped_for_internal_shlib_event (stop_bpstat)) | |
2977 | { | |
2978 | printf_filtered ("Stopped due to shared library event\n"); | |
2979 | } | |
87273c71 | 2980 | |
3950a34e RP |
2981 | /* Look up the hook_stop and run it if it exists. */ |
2982 | ||
65b07ddc | 2983 | if (stop_command && stop_command->hook) |
3950a34e | 2984 | { |
fbd641cb | 2985 | catch_errors (hook_stop_stub, stop_command->hook, |
fee44494 | 2986 | "Error while running hook_stop:\n", RETURN_MASK_ALL); |
3950a34e RP |
2987 | } |
2988 | ||
bd5635a1 | 2989 | if (!target_has_stack) |
65b07ddc DT |
2990 | { |
2991 | ||
1c95d7ab | 2992 | goto done; |
65b07ddc DT |
2993 | } |
2994 | ||
2995 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
2996 | and current location is based on that. | |
2997 | Don't do this on return from a stack dummy routine, | |
2998 | or if the program has exited. */ | |
bd5635a1 | 2999 | |
bd5635a1 RP |
3000 | if (!stop_stack_dummy) |
3001 | { | |
479f0f18 SG |
3002 | select_frame (get_current_frame (), 0); |
3003 | ||
65b07ddc DT |
3004 | /* Print current location without a level number, if |
3005 | we have changed functions or hit a breakpoint. | |
3006 | Print source line if we have one. | |
3007 | bpstat_print() contains the logic deciding in detail | |
3008 | what to print, based on the event(s) that just occurred. */ | |
3009 | ||
bd5635a1 RP |
3010 | if (stop_print_frame) |
3011 | { | |
65b07ddc DT |
3012 | int bpstat_ret; |
3013 | int source_flag; | |
3014 | ||
3015 | bpstat_ret = bpstat_print (stop_bpstat); | |
3016 | /* bpstat_print() returned one of: | |
3017 | -1: Didn't print anything | |
3018 | 0: Printed preliminary "Breakpoint n, " message, desires | |
3019 | location tacked on | |
3020 | 1: Printed something, don't tack on location */ | |
3021 | ||
3022 | if (bpstat_ret == -1) | |
3023 | if ( stop_step | |
3024 | && step_frame_address == FRAME_FP (get_current_frame ()) | |
3025 | && step_start_function == find_pc_function (stop_pc)) | |
3026 | source_flag = -1; /* finished step, just print source line */ | |
3027 | else | |
3028 | source_flag = 1; /* print location and source line */ | |
3029 | else if (bpstat_ret == 0) /* hit bpt, desire location */ | |
3030 | source_flag = 1; /* print location and source line */ | |
3031 | else /* bpstat_ret == 1, hit bpt, do not desire location */ | |
3032 | source_flag = -1; /* just print source line */ | |
3033 | ||
3034 | /* The behavior of this routine with respect to the source | |
3035 | flag is: | |
3036 | -1: Print only source line | |
3037 | 0: Print only location | |
3038 | 1: Print location and source line */ | |
3039 | show_and_print_stack_frame (selected_frame, -1, source_flag); | |
bd5635a1 RP |
3040 | |
3041 | /* Display the auto-display expressions. */ | |
3042 | do_displays (); | |
3043 | } | |
3044 | } | |
3045 | ||
3046 | /* Save the function value return registers, if we care. | |
3047 | We might be about to restore their previous contents. */ | |
3048 | if (proceed_to_finish) | |
3049 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
3050 | ||
3051 | if (stop_stack_dummy) | |
3052 | { | |
3053 | /* Pop the empty frame that contains the stack dummy. | |
3054 | POP_FRAME ends with a setting of the current frame, so we | |
3055 | can use that next. */ | |
3056 | POP_FRAME; | |
1f205f9d MS |
3057 | /* Set stop_pc to what it was before we called the function. |
3058 | Can't rely on restore_inferior_status because that only gets | |
3059 | called if we don't stop in the called function. */ | |
f1de67d3 | 3060 | stop_pc = read_pc(); |
bd5635a1 RP |
3061 | select_frame (get_current_frame (), 0); |
3062 | } | |
65b07ddc DT |
3063 | |
3064 | ||
3065 | TUIDO (((TuiOpaqueFuncPtr)tui_vCheckDataValues, selected_frame)); | |
3066 | ||
1c95d7ab JK |
3067 | done: |
3068 | annotate_stopped (); | |
bd5635a1 | 3069 | } |
3950a34e RP |
3070 | |
3071 | static int | |
3072 | hook_stop_stub (cmd) | |
fbd641cb | 3073 | PTR cmd; |
3950a34e RP |
3074 | { |
3075 | execute_user_command ((struct cmd_list_element *)cmd, 0); | |
a8a69e63 | 3076 | return (0); |
3950a34e | 3077 | } |
bd5635a1 | 3078 | \f |
cc221e76 FF |
3079 | int signal_stop_state (signo) |
3080 | int signo; | |
3081 | { | |
67ac9759 | 3082 | return signal_stop[signo]; |
cc221e76 FF |
3083 | } |
3084 | ||
3085 | int signal_print_state (signo) | |
3086 | int signo; | |
3087 | { | |
67ac9759 | 3088 | return signal_print[signo]; |
cc221e76 FF |
3089 | } |
3090 | ||
3091 | int signal_pass_state (signo) | |
3092 | int signo; | |
3093 | { | |
67ac9759 | 3094 | return signal_program[signo]; |
cc221e76 FF |
3095 | } |
3096 | ||
bd5635a1 RP |
3097 | static void |
3098 | sig_print_header () | |
3099 | { | |
67ac9759 JK |
3100 | printf_filtered ("\ |
3101 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
bd5635a1 RP |
3102 | } |
3103 | ||
3104 | static void | |
67ac9759 JK |
3105 | sig_print_info (oursig) |
3106 | enum target_signal oursig; | |
bd5635a1 | 3107 | { |
67ac9759 | 3108 | char *name = target_signal_to_name (oursig); |
24a38525 DP |
3109 | int name_padding = 13 - strlen (name); |
3110 | if (name_padding <= 0) | |
3111 | name_padding = 0; | |
3112 | ||
67ac9759 | 3113 | printf_filtered ("%s", name); |
1f205f9d MS |
3114 | printf_filtered ("%*.*s ", name_padding, name_padding, |
3115 | " "); | |
67ac9759 JK |
3116 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3117 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3118 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3119 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
bd5635a1 RP |
3120 | } |
3121 | ||
3122 | /* Specify how various signals in the inferior should be handled. */ | |
3123 | ||
3124 | static void | |
3125 | handle_command (args, from_tty) | |
3126 | char *args; | |
3127 | int from_tty; | |
3128 | { | |
072b552a JG |
3129 | char **argv; |
3130 | int digits, wordlen; | |
3131 | int sigfirst, signum, siglast; | |
67ac9759 | 3132 | enum target_signal oursig; |
072b552a JG |
3133 | int allsigs; |
3134 | int nsigs; | |
3135 | unsigned char *sigs; | |
3136 | struct cleanup *old_chain; | |
3137 | ||
3138 | if (args == NULL) | |
3139 | { | |
3140 | error_no_arg ("signal to handle"); | |
3141 | } | |
bd5635a1 | 3142 | |
072b552a JG |
3143 | /* Allocate and zero an array of flags for which signals to handle. */ |
3144 | ||
67ac9759 | 3145 | nsigs = (int)TARGET_SIGNAL_LAST; |
072b552a JG |
3146 | sigs = (unsigned char *) alloca (nsigs); |
3147 | memset (sigs, 0, nsigs); | |
bd5635a1 | 3148 | |
072b552a JG |
3149 | /* Break the command line up into args. */ |
3150 | ||
3151 | argv = buildargv (args); | |
3152 | if (argv == NULL) | |
bd5635a1 | 3153 | { |
072b552a JG |
3154 | nomem (0); |
3155 | } | |
02331869 | 3156 | old_chain = make_cleanup ((make_cleanup_func) freeargv, (char *) argv); |
bd5635a1 | 3157 | |
67ac9759 | 3158 | /* Walk through the args, looking for signal oursigs, signal names, and |
072b552a JG |
3159 | actions. Signal numbers and signal names may be interspersed with |
3160 | actions, with the actions being performed for all signals cumulatively | |
3161 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
bd5635a1 | 3162 | |
072b552a JG |
3163 | while (*argv != NULL) |
3164 | { | |
3165 | wordlen = strlen (*argv); | |
3166 | for (digits = 0; isdigit ((*argv)[digits]); digits++) {;} | |
3167 | allsigs = 0; | |
3168 | sigfirst = siglast = -1; | |
3169 | ||
3170 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3171 | { | |
3172 | /* Apply action to all signals except those used by the | |
3173 | debugger. Silently skip those. */ | |
3174 | allsigs = 1; | |
3175 | sigfirst = 0; | |
3176 | siglast = nsigs - 1; | |
3177 | } | |
3178 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3179 | { | |
3180 | SET_SIGS (nsigs, sigs, signal_stop); | |
3181 | SET_SIGS (nsigs, sigs, signal_print); | |
3182 | } | |
3183 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3184 | { | |
3185 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3186 | } | |
3187 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3188 | { | |
3189 | SET_SIGS (nsigs, sigs, signal_print); | |
3190 | } | |
3191 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3192 | { | |
3193 | SET_SIGS (nsigs, sigs, signal_program); | |
3194 | } | |
3195 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3196 | { | |
3197 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3198 | } | |
3199 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3200 | { | |
3201 | SET_SIGS (nsigs, sigs, signal_program); | |
3202 | } | |
3203 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3204 | { | |
3205 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3206 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3207 | } | |
3208 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3209 | { | |
3210 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3211 | } | |
3212 | else if (digits > 0) | |
bd5635a1 | 3213 | { |
1f205f9d MS |
3214 | /* It is numeric. The numeric signal refers to our own |
3215 | internal signal numbering from target.h, not to host/target | |
3216 | signal number. This is a feature; users really should be | |
3217 | using symbolic names anyway, and the common ones like | |
3218 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3219 | ||
3220 | sigfirst = siglast = (int) | |
3221 | target_signal_from_command (atoi (*argv)); | |
072b552a | 3222 | if ((*argv)[digits] == '-') |
bd5635a1 | 3223 | { |
1f205f9d MS |
3224 | siglast = (int) |
3225 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
bd5635a1 | 3226 | } |
072b552a | 3227 | if (sigfirst > siglast) |
bd5635a1 | 3228 | { |
072b552a JG |
3229 | /* Bet he didn't figure we'd think of this case... */ |
3230 | signum = sigfirst; | |
3231 | sigfirst = siglast; | |
3232 | siglast = signum; | |
bd5635a1 | 3233 | } |
bd5635a1 | 3234 | } |
072b552a | 3235 | else |
bd5635a1 | 3236 | { |
fcbc95a7 JK |
3237 | oursig = target_signal_from_name (*argv); |
3238 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3239 | { | |
3240 | sigfirst = siglast = (int)oursig; | |
3241 | } | |
3242 | else | |
3243 | { | |
3244 | /* Not a number and not a recognized flag word => complain. */ | |
3245 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3246 | } | |
bd5635a1 | 3247 | } |
072b552a JG |
3248 | |
3249 | /* If any signal numbers or symbol names were found, set flags for | |
3250 | which signals to apply actions to. */ | |
3251 | ||
3252 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
bd5635a1 | 3253 | { |
67ac9759 | 3254 | switch ((enum target_signal)signum) |
072b552a | 3255 | { |
67ac9759 JK |
3256 | case TARGET_SIGNAL_TRAP: |
3257 | case TARGET_SIGNAL_INT: | |
072b552a JG |
3258 | if (!allsigs && !sigs[signum]) |
3259 | { | |
67ac9759 JK |
3260 | if (query ("%s is used by the debugger.\n\ |
3261 | Are you sure you want to change it? ", | |
3262 | target_signal_to_name | |
3263 | ((enum target_signal)signum))) | |
072b552a JG |
3264 | { |
3265 | sigs[signum] = 1; | |
3266 | } | |
3267 | else | |
3268 | { | |
199b2450 TL |
3269 | printf_unfiltered ("Not confirmed, unchanged.\n"); |
3270 | gdb_flush (gdb_stdout); | |
072b552a JG |
3271 | } |
3272 | } | |
3273 | break; | |
c66ed884 SG |
3274 | case TARGET_SIGNAL_0: |
3275 | case TARGET_SIGNAL_DEFAULT: | |
3276 | case TARGET_SIGNAL_UNKNOWN: | |
3277 | /* Make sure that "all" doesn't print these. */ | |
3278 | break; | |
072b552a JG |
3279 | default: |
3280 | sigs[signum] = 1; | |
3281 | break; | |
3282 | } | |
bd5635a1 RP |
3283 | } |
3284 | ||
072b552a | 3285 | argv++; |
bd5635a1 RP |
3286 | } |
3287 | ||
de43d7d0 | 3288 | target_notice_signals(inferior_pid); |
cc221e76 | 3289 | |
bd5635a1 RP |
3290 | if (from_tty) |
3291 | { | |
3292 | /* Show the results. */ | |
3293 | sig_print_header (); | |
072b552a JG |
3294 | for (signum = 0; signum < nsigs; signum++) |
3295 | { | |
3296 | if (sigs[signum]) | |
3297 | { | |
3298 | sig_print_info (signum); | |
3299 | } | |
3300 | } | |
bd5635a1 | 3301 | } |
072b552a JG |
3302 | |
3303 | do_cleanups (old_chain); | |
bd5635a1 RP |
3304 | } |
3305 | ||
65b07ddc DT |
3306 | static void |
3307 | xdb_handle_command (args, from_tty) | |
3308 | char *args; | |
3309 | int from_tty; | |
3310 | { | |
3311 | char **argv; | |
3312 | struct cleanup *old_chain; | |
3313 | ||
3314 | /* Break the command line up into args. */ | |
3315 | ||
3316 | argv = buildargv (args); | |
3317 | if (argv == NULL) | |
3318 | { | |
3319 | nomem (0); | |
3320 | } | |
1f205f9d | 3321 | old_chain = make_cleanup ((make_cleanup_func) freeargv, (char *) argv); |
65b07ddc DT |
3322 | if (argv[1] != (char *)NULL) |
3323 | { | |
3324 | char *argBuf; | |
3325 | int bufLen; | |
3326 | ||
3327 | bufLen = strlen(argv[0]) + 20; | |
3328 | argBuf = (char *)xmalloc(bufLen); | |
3329 | if (argBuf) | |
3330 | { | |
3331 | int validFlag = 1; | |
3332 | enum target_signal oursig; | |
3333 | ||
3334 | oursig = target_signal_from_name (argv[0]); | |
3335 | memset(argBuf, 0, bufLen); | |
3336 | if (strcmp(argv[1], "Q") == 0) | |
3337 | sprintf(argBuf, "%s %s", argv[0], "noprint"); | |
3338 | else | |
3339 | { | |
3340 | if (strcmp(argv[1], "s") == 0) | |
3341 | { | |
3342 | if (!signal_stop[oursig]) | |
3343 | sprintf(argBuf, "%s %s", argv[0], "stop"); | |
3344 | else | |
3345 | sprintf(argBuf, "%s %s", argv[0], "nostop"); | |
3346 | } | |
3347 | else if (strcmp(argv[1], "i") == 0) | |
3348 | { | |
3349 | if (!signal_program[oursig]) | |
3350 | sprintf(argBuf, "%s %s", argv[0], "pass"); | |
3351 | else | |
3352 | sprintf(argBuf, "%s %s", argv[0], "nopass"); | |
3353 | } | |
3354 | else if (strcmp(argv[1], "r") == 0) | |
3355 | { | |
3356 | if (!signal_print[oursig]) | |
3357 | sprintf(argBuf, "%s %s", argv[0], "print"); | |
3358 | else | |
3359 | sprintf(argBuf, "%s %s", argv[0], "noprint"); | |
3360 | } | |
3361 | else | |
3362 | validFlag = 0; | |
3363 | } | |
3364 | if (validFlag) | |
3365 | handle_command(argBuf, from_tty); | |
3366 | else | |
3367 | printf_filtered("Invalid signal handling flag.\n"); | |
3368 | if (argBuf) | |
3369 | free(argBuf); | |
3370 | } | |
3371 | } | |
3372 | do_cleanups (old_chain); | |
3373 | } | |
3374 | ||
67ac9759 JK |
3375 | /* Print current contents of the tables set by the handle command. |
3376 | It is possible we should just be printing signals actually used | |
3377 | by the current target (but for things to work right when switching | |
3378 | targets, all signals should be in the signal tables). */ | |
bd5635a1 RP |
3379 | |
3380 | static void | |
e37a6e9c | 3381 | signals_info (signum_exp, from_tty) |
bd5635a1 | 3382 | char *signum_exp; |
e37a6e9c | 3383 | int from_tty; |
bd5635a1 | 3384 | { |
67ac9759 | 3385 | enum target_signal oursig; |
bd5635a1 RP |
3386 | sig_print_header (); |
3387 | ||
3388 | if (signum_exp) | |
3389 | { | |
3390 | /* First see if this is a symbol name. */ | |
67ac9759 JK |
3391 | oursig = target_signal_from_name (signum_exp); |
3392 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
bd5635a1 | 3393 | { |
c66ed884 SG |
3394 | /* No, try numeric. */ |
3395 | oursig = | |
3396 | target_signal_from_command (parse_and_eval_address (signum_exp)); | |
bd5635a1 | 3397 | } |
67ac9759 | 3398 | sig_print_info (oursig); |
bd5635a1 RP |
3399 | return; |
3400 | } | |
3401 | ||
3402 | printf_filtered ("\n"); | |
db4340a6 | 3403 | /* These ugly casts brought to you by the native VAX compiler. */ |
2fe3b329 | 3404 | for (oursig = TARGET_SIGNAL_FIRST; |
db4340a6 JK |
3405 | (int)oursig < (int)TARGET_SIGNAL_LAST; |
3406 | oursig = (enum target_signal)((int)oursig + 1)) | |
bd5635a1 RP |
3407 | { |
3408 | QUIT; | |
3409 | ||
fcbc95a7 JK |
3410 | if (oursig != TARGET_SIGNAL_UNKNOWN |
3411 | && oursig != TARGET_SIGNAL_DEFAULT | |
3412 | && oursig != TARGET_SIGNAL_0) | |
67ac9759 | 3413 | sig_print_info (oursig); |
bd5635a1 RP |
3414 | } |
3415 | ||
3416 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3417 | } | |
3418 | \f | |
3419 | /* Save all of the information associated with the inferior<==>gdb | |
3420 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3421 | (defined in inferior.h). */ | |
3422 | ||
3423 | void | |
3424 | save_inferior_status (inf_status, restore_stack_info) | |
3425 | struct inferior_status *inf_status; | |
3426 | int restore_stack_info; | |
3427 | { | |
bd5635a1 RP |
3428 | inf_status->stop_signal = stop_signal; |
3429 | inf_status->stop_pc = stop_pc; | |
bd5635a1 RP |
3430 | inf_status->stop_step = stop_step; |
3431 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3432 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3433 | inf_status->trap_expected = trap_expected; | |
3434 | inf_status->step_range_start = step_range_start; | |
3435 | inf_status->step_range_end = step_range_end; | |
3436 | inf_status->step_frame_address = step_frame_address; | |
3437 | inf_status->step_over_calls = step_over_calls; | |
bd5635a1 RP |
3438 | inf_status->stop_after_trap = stop_after_trap; |
3439 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
3440 | /* Save original bpstat chain here; replace it with copy of chain. | |
3441 | If caller's caller is walking the chain, they'll be happier if we | |
3442 | hand them back the original chain when restore_i_s is called. */ | |
3443 | inf_status->stop_bpstat = stop_bpstat; | |
3444 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3445 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3446 | inf_status->restore_stack_info = restore_stack_info; | |
3447 | inf_status->proceed_to_finish = proceed_to_finish; | |
3448 | ||
072b552a | 3449 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
37c99ddb JK |
3450 | |
3451 | read_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
3452 | ||
bd5635a1 RP |
3453 | record_selected_frame (&(inf_status->selected_frame_address), |
3454 | &(inf_status->selected_level)); | |
3455 | return; | |
3456 | } | |
3457 | ||
37c99ddb | 3458 | struct restore_selected_frame_args { |
4cc1b3f7 | 3459 | CORE_ADDR frame_address; |
37c99ddb JK |
3460 | int level; |
3461 | }; | |
3462 | ||
fbd641cb | 3463 | static int restore_selected_frame PARAMS ((PTR)); |
37c99ddb JK |
3464 | |
3465 | /* Restore the selected frame. args is really a struct | |
3466 | restore_selected_frame_args * (declared as char * for catch_errors) | |
3467 | telling us what frame to restore. Returns 1 for success, or 0 for | |
3468 | failure. An error message will have been printed on error. */ | |
4cc1b3f7 | 3469 | |
37c99ddb JK |
3470 | static int |
3471 | restore_selected_frame (args) | |
fbd641cb | 3472 | PTR args; |
37c99ddb JK |
3473 | { |
3474 | struct restore_selected_frame_args *fr = | |
3475 | (struct restore_selected_frame_args *) args; | |
4cc1b3f7 | 3476 | struct frame_info *frame; |
37c99ddb JK |
3477 | int level = fr->level; |
3478 | ||
4cc1b3f7 | 3479 | frame = find_relative_frame (get_current_frame (), &level); |
37c99ddb JK |
3480 | |
3481 | /* If inf_status->selected_frame_address is NULL, there was no | |
3482 | previously selected frame. */ | |
4cc1b3f7 | 3483 | if (frame == NULL || |
1f205f9d MS |
3484 | /* FRAME_FP (frame) != fr->frame_address || */ |
3485 | /* elz: deleted this check as a quick fix to the problem that | |
3486 | for function called by hand gdb creates no internal frame | |
3487 | structure and the real stack and gdb's idea of stack are | |
3488 | different if nested calls by hands are made. | |
3489 | ||
3490 | mvs: this worries me. */ | |
37c99ddb | 3491 | level != 0) |
65b07ddc | 3492 | { |
37c99ddb JK |
3493 | warning ("Unable to restore previously selected frame.\n"); |
3494 | return 0; | |
3495 | } | |
65b07ddc | 3496 | |
4cc1b3f7 | 3497 | select_frame (frame, fr->level); |
65b07ddc | 3498 | |
37c99ddb JK |
3499 | return(1); |
3500 | } | |
3501 | ||
bd5635a1 RP |
3502 | void |
3503 | restore_inferior_status (inf_status) | |
3504 | struct inferior_status *inf_status; | |
3505 | { | |
bd5635a1 RP |
3506 | stop_signal = inf_status->stop_signal; |
3507 | stop_pc = inf_status->stop_pc; | |
bd5635a1 RP |
3508 | stop_step = inf_status->stop_step; |
3509 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3510 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3511 | trap_expected = inf_status->trap_expected; | |
3512 | step_range_start = inf_status->step_range_start; | |
3513 | step_range_end = inf_status->step_range_end; | |
3514 | step_frame_address = inf_status->step_frame_address; | |
3515 | step_over_calls = inf_status->step_over_calls; | |
bd5635a1 RP |
3516 | stop_after_trap = inf_status->stop_after_trap; |
3517 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
3518 | bpstat_clear (&stop_bpstat); | |
3519 | stop_bpstat = inf_status->stop_bpstat; | |
3520 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3521 | proceed_to_finish = inf_status->proceed_to_finish; | |
3522 | ||
072b552a | 3523 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
bd5635a1 RP |
3524 | |
3525 | /* The inferior can be gone if the user types "print exit(0)" | |
3526 | (and perhaps other times). */ | |
37c99ddb JK |
3527 | if (target_has_execution) |
3528 | write_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
3529 | ||
3530 | /* The inferior can be gone if the user types "print exit(0)" | |
3531 | (and perhaps other times). */ | |
3532 | ||
3533 | /* FIXME: If we are being called after stopping in a function which | |
3534 | is called from gdb, we should not be trying to restore the | |
3535 | selected frame; it just prints a spurious error message (The | |
3536 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3537 | clobbers the stack)). In fact, should we be restoring the | |
3538 | inferior status at all in that case? . */ | |
3539 | ||
bd5635a1 RP |
3540 | if (target_has_stack && inf_status->restore_stack_info) |
3541 | { | |
37c99ddb JK |
3542 | struct restore_selected_frame_args fr; |
3543 | fr.level = inf_status->selected_level; | |
3544 | fr.frame_address = inf_status->selected_frame_address; | |
3545 | /* The point of catch_errors is that if the stack is clobbered, | |
3546 | walking the stack might encounter a garbage pointer and error() | |
3547 | trying to dereference it. */ | |
3548 | if (catch_errors (restore_selected_frame, &fr, | |
3549 | "Unable to restore previously selected frame:\n", | |
3550 | RETURN_MASK_ERROR) == 0) | |
3551 | /* Error in restoring the selected frame. Select the innermost | |
3552 | frame. */ | |
65b07ddc DT |
3553 | |
3554 | ||
3555 | select_frame (get_current_frame (), 0); | |
3556 | ||
bd5635a1 RP |
3557 | } |
3558 | } | |
3559 | ||
65b07ddc DT |
3560 | |
3561 | \f | |
3562 | void | |
3563 | set_follow_fork_mode_command (arg, from_tty, c) | |
3564 | char * arg; | |
3565 | int from_tty; | |
3566 | struct cmd_list_element * c; | |
3567 | { | |
3568 | if (! STREQ (arg, "parent") && | |
3569 | ! STREQ (arg, "child") && | |
3570 | ! STREQ (arg, "both") && | |
3571 | ! STREQ (arg, "ask")) | |
3572 | error ("follow-fork-mode must be one of \"parent\", \"child\", \"both\" or \"ask\"."); | |
3573 | ||
3574 | if (follow_fork_mode_string != NULL) | |
3575 | free (follow_fork_mode_string); | |
3576 | follow_fork_mode_string = savestring (arg, strlen (arg)); | |
3577 | } | |
3578 | ||
3579 | ||
bd5635a1 RP |
3580 | \f |
3581 | void | |
3582 | _initialize_infrun () | |
3583 | { | |
3584 | register int i; | |
e37a6e9c | 3585 | register int numsigs; |
3ab2abae | 3586 | struct cmd_list_element * c; |
bd5635a1 RP |
3587 | |
3588 | add_info ("signals", signals_info, | |
3589 | "What debugger does when program gets various signals.\n\ | |
c66ed884 | 3590 | Specify a signal as argument to print info on that signal only."); |
6b50c5c2 | 3591 | add_info_alias ("handle", "signals", 0); |
bd5635a1 RP |
3592 | |
3593 | add_com ("handle", class_run, handle_command, | |
c66ed884 SG |
3594 | concat ("Specify how to handle a signal.\n\ |
3595 | Args are signals and actions to apply to those signals.\n\ | |
3596 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3597 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3598 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
072b552a | 3599 | The special arg \"all\" is recognized to mean all signals except those\n\ |
c66ed884 SG |
3600 | used by the debugger, typically SIGTRAP and SIGINT.\n", |
3601 | "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
072b552a | 3602 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
bd5635a1 | 3603 | Stop means reenter debugger if this signal happens (implies print).\n\ |
072b552a | 3604 | Print means print a message if this signal happens.\n\ |
bd5635a1 | 3605 | Pass means let program see this signal; otherwise program doesn't know.\n\ |
072b552a | 3606 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
c66ed884 | 3607 | Pass and Stop may be combined.", NULL)); |
65b07ddc DT |
3608 | if (xdb_commands) |
3609 | { | |
3610 | add_com("lz", class_info, signals_info, | |
3611 | "What debugger does when program gets various signals.\n\ | |
3612 | Specify a signal as argument to print info on that signal only."); | |
3613 | add_com("z", class_run, xdb_handle_command, | |
3614 | concat ("Specify how to handle a signal.\n\ | |
3615 | Args are signals and actions to apply to those signals.\n\ | |
3616 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3617 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3618 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3619 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
3620 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
3621 | "Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
3622 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ | |
3623 | nopass), \"Q\" (noprint)\n\ | |
3624 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3625 | Print means print a message if this signal happens.\n\ | |
3626 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3627 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3628 | Pass and Stop may be combined.", NULL)); | |
3629 | } | |
bd5635a1 | 3630 | |
65b07ddc DT |
3631 | if (!dbx_commands) |
3632 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, | |
3950a34e RP |
3633 | "There is no `stop' command, but you can set a hook on `stop'.\n\ |
3634 | This allows you to set a list of commands to be run each time execution\n\ | |
fee44494 | 3635 | of the program stops.", &cmdlist); |
3950a34e | 3636 | |
67ac9759 JK |
3637 | numsigs = (int)TARGET_SIGNAL_LAST; |
3638 | signal_stop = (unsigned char *) | |
3639 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
3640 | signal_print = (unsigned char *) | |
3641 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
072b552a | 3642 | signal_program = (unsigned char *) |
67ac9759 | 3643 | xmalloc (sizeof (signal_program[0]) * numsigs); |
e37a6e9c | 3644 | for (i = 0; i < numsigs; i++) |
bd5635a1 RP |
3645 | { |
3646 | signal_stop[i] = 1; | |
3647 | signal_print[i] = 1; | |
3648 | signal_program[i] = 1; | |
3649 | } | |
3650 | ||
3651 | /* Signals caused by debugger's own actions | |
3652 | should not be given to the program afterwards. */ | |
67ac9759 JK |
3653 | signal_program[TARGET_SIGNAL_TRAP] = 0; |
3654 | signal_program[TARGET_SIGNAL_INT] = 0; | |
bd5635a1 RP |
3655 | |
3656 | /* Signals that are not errors should not normally enter the debugger. */ | |
67ac9759 JK |
3657 | signal_stop[TARGET_SIGNAL_ALRM] = 0; |
3658 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
3659 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
3660 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
3661 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
3662 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
3663 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
3664 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
3665 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
3666 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4d4f2d50 JK |
3667 | signal_stop[TARGET_SIGNAL_POLL] = 0; |
3668 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
67ac9759 JK |
3669 | signal_stop[TARGET_SIGNAL_URG] = 0; |
3670 | signal_print[TARGET_SIGNAL_URG] = 0; | |
fbd641cb EZ |
3671 | signal_stop[TARGET_SIGNAL_WINCH] = 0; |
3672 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
87273c71 JL |
3673 | |
3674 | #ifdef SOLIB_ADD | |
3675 | add_show_from_set | |
3676 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
3677 | (char *) &stop_on_solib_events, | |
3678 | "Set stopping for shared library events.\n\ | |
3679 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
3680 | notifies gdb of shared library events. The most common event of interest\n\ | |
3681 | to the user would be loading/unloading of a new library.\n", | |
3682 | &setlist), | |
3683 | &showlist); | |
3684 | #endif | |
65b07ddc DT |
3685 | |
3686 | c = add_set_enum_cmd ("follow-fork-mode", | |
3687 | class_run, | |
3688 | follow_fork_mode_kind_names, | |
3689 | (char *) &follow_fork_mode_string, | |
3690 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 | |
3691 | kernel problem. It's also not terribly useful without a GUI to | |
3692 | help the user drive two debuggers. So for now, I'm disabling | |
1f205f9d MS |
3693 | the "both" option. */ |
3694 | /* "Set debugger response to a program call of fork \ | |
3695 | or vfork.\n\ | |
65b07ddc DT |
3696 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
3697 | parent - the original process is debugged after a fork\n\ | |
3698 | child - the new process is debugged after a fork\n\ | |
3699 | both - both the parent and child are debugged after a fork\n\ | |
3700 | ask - the debugger will ask for one of the above choices\n\ | |
3701 | For \"both\", another copy of the debugger will be started to follow\n\ | |
3702 | the new child process. The original debugger will continue to follow\n\ | |
3703 | the original parent process. To distinguish their prompts, the\n\ | |
3704 | debugger copy's prompt will be changed.\n\ | |
3705 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
3706 | By default, the debugger will follow the parent process.", | |
3707 | */ | |
1f205f9d MS |
3708 | "Set debugger response to a program call of fork \ |
3709 | or vfork.\n\ | |
65b07ddc DT |
3710 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
3711 | parent - the original process is debugged after a fork\n\ | |
3712 | child - the new process is debugged after a fork\n\ | |
3713 | ask - the debugger will ask for one of the above choices\n\ | |
3714 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
3715 | By default, the debugger will follow the parent process.", | |
3716 | &setlist); | |
3717 | /* c->function.sfunc = ;*/ | |
3718 | add_show_from_set (c, &showlist); | |
3719 | ||
3720 | set_follow_fork_mode_command ("parent", 0, NULL); | |
3ab2abae MS |
3721 | |
3722 | c = add_set_enum_cmd ("scheduler-locking", class_run, | |
3723 | scheduler_enums, /* array of string names */ | |
3724 | (char *) &scheduler_mode, /* current mode */ | |
3725 | "Set mode for locking scheduler during execution.\n\ | |
3726 | off == no locking (threads may preempt at any time)\n\ | |
3727 | on == full locking (no thread except the current thread may run)\n\ | |
3728 | step == scheduler locked during every single-step operation.\n\ | |
3729 | In this mode, no other thread may run during a step command.\n\ | |
3730 | Other threads may run while stepping over a function call ('next').", | |
3731 | &setlist); | |
3732 | ||
3733 | c->function.sfunc = set_schedlock_func; /* traps on target vector */ | |
3734 | add_show_from_set (c, &showlist); | |
bd5635a1 | 3735 | } |