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c906108c | 1 | /* Target-struct-independent code to start (run) and stop an inferior process. |
7a292a7a | 2 | Copyright 1986-1989, 1991-1999 Free Software Foundation, Inc. |
c906108c SS |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "gdb_string.h" | |
22 | #include <ctype.h> | |
23 | #include "symtab.h" | |
24 | #include "frame.h" | |
25 | #include "inferior.h" | |
26 | #include "breakpoint.h" | |
27 | #include "wait.h" | |
28 | #include "gdbcore.h" | |
29 | #include "gdbcmd.h" | |
30 | #include "target.h" | |
31 | #include "gdbthread.h" | |
32 | #include "annotate.h" | |
33 | #include "symfile.h" /* for overlay functions */ | |
7a292a7a | 34 | #include "top.h" |
c906108c | 35 | #include <signal.h> |
43ff13b4 | 36 | #include "event-loop.h" |
c906108c SS |
37 | |
38 | /* Prototypes for local functions */ | |
39 | ||
40 | static void signals_info PARAMS ((char *, int)); | |
41 | ||
42 | static void handle_command PARAMS ((char *, int)); | |
43 | ||
44 | static void sig_print_info PARAMS ((enum target_signal)); | |
45 | ||
46 | static void sig_print_header PARAMS ((void)); | |
47 | ||
48 | static void resume_cleanups PARAMS ((int)); | |
49 | ||
50 | static int hook_stop_stub PARAMS ((PTR)); | |
51 | ||
52 | static void delete_breakpoint_current_contents PARAMS ((PTR)); | |
53 | ||
7a292a7a SS |
54 | static void set_follow_fork_mode_command PARAMS ((char *arg, int from_tty, struct cmd_list_element *c)); |
55 | ||
43ff13b4 JM |
56 | static void complete_execution PARAMS ((void)); |
57 | ||
c906108c SS |
58 | int inferior_ignoring_startup_exec_events = 0; |
59 | int inferior_ignoring_leading_exec_events = 0; | |
60 | ||
43ff13b4 JM |
61 | /* In asynchronous mode, but simulating synchronous execution. */ |
62 | int sync_execution = 0; | |
63 | ||
c906108c SS |
64 | /* wait_for_inferior and normal_stop use this to notify the user |
65 | when the inferior stopped in a different thread than it had been | |
66 | running in. */ | |
67 | static int switched_from_inferior_pid; | |
7a292a7a SS |
68 | |
69 | /* This will be true for configurations that may actually report an | |
70 | inferior pid different from the original. At present this is only | |
71 | true for HP-UX native. */ | |
72 | ||
73 | #ifndef MAY_SWITCH_FROM_INFERIOR_PID | |
74 | #define MAY_SWITCH_FROM_INFERIOR_PID (0) | |
75 | #endif | |
76 | ||
77 | static int may_switch_from_inferior_pid = MAY_SWITCH_FROM_INFERIOR_PID; | |
78 | ||
79 | /* This is true for configurations that may follow through execl() and | |
80 | similar functions. At present this is only true for HP-UX native. */ | |
81 | ||
82 | #ifndef MAY_FOLLOW_EXEC | |
83 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
84 | #endif |
85 | ||
7a292a7a SS |
86 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
87 | ||
c906108c SS |
88 | /* resume and wait_for_inferior use this to ensure that when |
89 | stepping over a hit breakpoint in a threaded application | |
90 | only the thread that hit the breakpoint is stepped and the | |
91 | other threads don't continue. This prevents having another | |
92 | thread run past the breakpoint while it is temporarily | |
93 | removed. | |
94 | ||
95 | This is not thread-specific, so it isn't saved as part of | |
96 | the infrun state. | |
97 | ||
98 | Versions of gdb which don't use the "step == this thread steps | |
99 | and others continue" model but instead use the "step == this | |
100 | thread steps and others wait" shouldn't do this. */ | |
101 | static int thread_step_needed = 0; | |
102 | ||
7a292a7a SS |
103 | /* This is true if thread_step_needed should actually be used. At |
104 | present this is only true for HP-UX native. */ | |
105 | ||
106 | #ifndef USE_THREAD_STEP_NEEDED | |
107 | #define USE_THREAD_STEP_NEEDED (0) | |
108 | #endif | |
109 | ||
110 | static int use_thread_step_needed = USE_THREAD_STEP_NEEDED; | |
111 | ||
392a587b JM |
112 | static void follow_inferior_fork PARAMS ((int parent_pid, |
113 | int child_pid, | |
114 | int has_forked, | |
115 | int has_vforked)); | |
116 | ||
117 | static void follow_fork PARAMS ((int parent_pid, int child_pid)); | |
118 | ||
119 | static void follow_vfork PARAMS ((int parent_pid, int child_pid)); | |
120 | ||
121 | static void set_schedlock_func PARAMS ((char *args, int from_tty, | |
122 | struct cmd_list_element *c)); | |
123 | ||
124 | static int is_internal_shlib_eventpoint PARAMS ((struct breakpoint *ep)); | |
125 | ||
126 | static int stopped_for_internal_shlib_event PARAMS ((bpstat bs)); | |
127 | ||
128 | static int stopped_for_shlib_catchpoint PARAMS ((bpstat bs, | |
129 | struct breakpoint **cp_p)); | |
130 | ||
131 | #if __STDC__ | |
132 | struct execution_control_state; | |
133 | #endif | |
134 | static int currently_stepping PARAMS ((struct execution_control_state *ecs)); | |
135 | ||
136 | static void xdb_handle_command PARAMS ((char *args, int from_tty)); | |
137 | ||
c906108c SS |
138 | void _initialize_infrun PARAMS ((void)); |
139 | ||
140 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the | |
141 | program. It needs to examine the jmp_buf argument and extract the PC | |
142 | from it. The return value is non-zero on success, zero otherwise. */ | |
143 | ||
144 | #ifndef GET_LONGJMP_TARGET | |
145 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 | |
146 | #endif | |
147 | ||
148 | ||
149 | /* Some machines have trampoline code that sits between function callers | |
150 | and the actual functions themselves. If this machine doesn't have | |
151 | such things, disable their processing. */ | |
152 | ||
153 | #ifndef SKIP_TRAMPOLINE_CODE | |
154 | #define SKIP_TRAMPOLINE_CODE(pc) 0 | |
155 | #endif | |
156 | ||
157 | /* Dynamic function trampolines are similar to solib trampolines in that they | |
158 | are between the caller and the callee. The difference is that when you | |
159 | enter a dynamic trampoline, you can't determine the callee's address. Some | |
160 | (usually complex) code needs to run in the dynamic trampoline to figure out | |
161 | the callee's address. This macro is usually called twice. First, when we | |
162 | enter the trampoline (looks like a normal function call at that point). It | |
163 | should return the PC of a point within the trampoline where the callee's | |
164 | address is known. Second, when we hit the breakpoint, this routine returns | |
165 | the callee's address. At that point, things proceed as per a step resume | |
166 | breakpoint. */ | |
167 | ||
168 | #ifndef DYNAMIC_TRAMPOLINE_NEXTPC | |
169 | #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0 | |
170 | #endif | |
171 | ||
172 | /* On SVR4 based systems, determining the callee's address is exceedingly | |
173 | difficult and depends on the implementation of the run time loader. | |
174 | If we are stepping at the source level, we single step until we exit | |
175 | the run time loader code and reach the callee's address. */ | |
176 | ||
177 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
178 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
179 | #endif | |
180 | ||
181 | /* For SVR4 shared libraries, each call goes through a small piece of | |
182 | trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates | |
183 | to nonzero if we are current stopped in one of these. */ | |
184 | ||
185 | #ifndef IN_SOLIB_CALL_TRAMPOLINE | |
186 | #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0 | |
187 | #endif | |
188 | ||
189 | /* In some shared library schemes, the return path from a shared library | |
190 | call may need to go through a trampoline too. */ | |
191 | ||
192 | #ifndef IN_SOLIB_RETURN_TRAMPOLINE | |
193 | #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0 | |
194 | #endif | |
195 | ||
196 | /* This function returns TRUE if pc is the address of an instruction | |
197 | that lies within the dynamic linker (such as the event hook, or the | |
198 | dld itself). | |
199 | ||
200 | This function must be used only when a dynamic linker event has | |
201 | been caught, and the inferior is being stepped out of the hook, or | |
202 | undefined results are guaranteed. */ | |
203 | ||
204 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
205 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
206 | #endif | |
207 | ||
208 | /* On MIPS16, a function that returns a floating point value may call | |
209 | a library helper function to copy the return value to a floating point | |
210 | register. The IGNORE_HELPER_CALL macro returns non-zero if we | |
211 | should ignore (i.e. step over) this function call. */ | |
212 | #ifndef IGNORE_HELPER_CALL | |
213 | #define IGNORE_HELPER_CALL(pc) 0 | |
214 | #endif | |
215 | ||
216 | /* On some systems, the PC may be left pointing at an instruction that won't | |
217 | actually be executed. This is usually indicated by a bit in the PSW. If | |
218 | we find ourselves in such a state, then we step the target beyond the | |
219 | nullified instruction before returning control to the user so as to avoid | |
220 | confusion. */ | |
221 | ||
222 | #ifndef INSTRUCTION_NULLIFIED | |
223 | #define INSTRUCTION_NULLIFIED 0 | |
224 | #endif | |
225 | ||
7a292a7a SS |
226 | /* Convert the #defines into values. This is temporary until wfi control |
227 | flow is completely sorted out. */ | |
228 | ||
229 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
230 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
231 | #else | |
232 | #undef HAVE_STEPPABLE_WATCHPOINT | |
233 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
234 | #endif | |
235 | ||
236 | #ifndef HAVE_NONSTEPPABLE_WATCHPOINT | |
237 | #define HAVE_NONSTEPPABLE_WATCHPOINT 0 | |
238 | #else | |
239 | #undef HAVE_NONSTEPPABLE_WATCHPOINT | |
240 | #define HAVE_NONSTEPPABLE_WATCHPOINT 1 | |
241 | #endif | |
242 | ||
243 | #ifndef HAVE_CONTINUABLE_WATCHPOINT | |
244 | #define HAVE_CONTINUABLE_WATCHPOINT 0 | |
245 | #else | |
246 | #undef HAVE_CONTINUABLE_WATCHPOINT | |
247 | #define HAVE_CONTINUABLE_WATCHPOINT 1 | |
248 | #endif | |
249 | ||
c906108c SS |
250 | /* Tables of how to react to signals; the user sets them. */ |
251 | ||
252 | static unsigned char *signal_stop; | |
253 | static unsigned char *signal_print; | |
254 | static unsigned char *signal_program; | |
255 | ||
256 | #define SET_SIGS(nsigs,sigs,flags) \ | |
257 | do { \ | |
258 | int signum = (nsigs); \ | |
259 | while (signum-- > 0) \ | |
260 | if ((sigs)[signum]) \ | |
261 | (flags)[signum] = 1; \ | |
262 | } while (0) | |
263 | ||
264 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
265 | do { \ | |
266 | int signum = (nsigs); \ | |
267 | while (signum-- > 0) \ | |
268 | if ((sigs)[signum]) \ | |
269 | (flags)[signum] = 0; \ | |
270 | } while (0) | |
271 | ||
272 | ||
273 | /* Command list pointer for the "stop" placeholder. */ | |
274 | ||
275 | static struct cmd_list_element *stop_command; | |
276 | ||
277 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
278 | ||
279 | static int breakpoints_inserted; | |
280 | ||
281 | /* Function inferior was in as of last step command. */ | |
282 | ||
283 | static struct symbol *step_start_function; | |
284 | ||
285 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
286 | ||
287 | static int trap_expected; | |
288 | ||
289 | #ifdef SOLIB_ADD | |
290 | /* Nonzero if we want to give control to the user when we're notified | |
291 | of shared library events by the dynamic linker. */ | |
292 | static int stop_on_solib_events; | |
293 | #endif | |
294 | ||
295 | #ifdef HP_OS_BUG | |
296 | /* Nonzero if the next time we try to continue the inferior, it will | |
297 | step one instruction and generate a spurious trace trap. | |
298 | This is used to compensate for a bug in HP-UX. */ | |
299 | ||
300 | static int trap_expected_after_continue; | |
301 | #endif | |
302 | ||
303 | /* Nonzero means expecting a trace trap | |
304 | and should stop the inferior and return silently when it happens. */ | |
305 | ||
306 | int stop_after_trap; | |
307 | ||
308 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
309 | It is used after attach, due to attaching to a process; | |
310 | when running in the shell before the child program has been exec'd; | |
311 | and when running some kinds of remote stuff (FIXME?). */ | |
312 | ||
313 | int stop_soon_quietly; | |
314 | ||
315 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
316 | situation when stop_registers should be saved. */ | |
317 | ||
318 | int proceed_to_finish; | |
319 | ||
320 | /* Save register contents here when about to pop a stack dummy frame, | |
321 | if-and-only-if proceed_to_finish is set. | |
322 | Thus this contains the return value from the called function (assuming | |
323 | values are returned in a register). */ | |
324 | ||
7a292a7a | 325 | char *stop_registers; |
c906108c SS |
326 | |
327 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
328 | ||
329 | static int breakpoints_failed; | |
330 | ||
331 | /* Nonzero after stop if current stack frame should be printed. */ | |
332 | ||
333 | static int stop_print_frame; | |
334 | ||
335 | static struct breakpoint *step_resume_breakpoint = NULL; | |
336 | static struct breakpoint *through_sigtramp_breakpoint = NULL; | |
337 | ||
338 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
339 | interactions with an inferior that is running a kernel function | |
340 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
341 | may have a need to know when the inferior is in a syscall. This | |
342 | is a count of the number of inferior threads which are known to | |
343 | currently be running in a syscall. */ | |
344 | static int number_of_threads_in_syscalls; | |
345 | ||
346 | /* This is used to remember when a fork, vfork or exec event | |
347 | was caught by a catchpoint, and thus the event is to be | |
348 | followed at the next resume of the inferior, and not | |
349 | immediately. */ | |
350 | static struct | |
351 | { | |
352 | enum target_waitkind kind; | |
353 | struct | |
354 | { | |
355 | int parent_pid; | |
356 | int saw_parent_fork; | |
357 | int child_pid; | |
358 | int saw_child_fork; | |
359 | int saw_child_exec; | |
360 | } | |
361 | fork_event; | |
362 | char *execd_pathname; | |
363 | } | |
364 | pending_follow; | |
365 | ||
366 | /* Some platforms don't allow us to do anything meaningful with a | |
367 | vforked child until it has exec'd. Vforked processes on such | |
368 | platforms can only be followed after they've exec'd. | |
369 | ||
370 | When this is set to 0, a vfork can be immediately followed, | |
371 | and an exec can be followed merely as an exec. When this is | |
372 | set to 1, a vfork event has been seen, but cannot be followed | |
373 | until the exec is seen. | |
374 | ||
375 | (In the latter case, inferior_pid is still the parent of the | |
376 | vfork, and pending_follow.fork_event.child_pid is the child. The | |
377 | appropriate process is followed, according to the setting of | |
378 | follow-fork-mode.) */ | |
379 | static int follow_vfork_when_exec; | |
380 | ||
381 | static char *follow_fork_mode_kind_names[] = | |
382 | { | |
383 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 | |
384 | kernel problem. It's also not terribly useful without a GUI to | |
385 | help the user drive two debuggers. So for now, I'm disabling | |
386 | the "both" option. | |
387 | "parent", "child", "both", "ask" }; | |
388 | */ | |
389 | "parent", "child", "ask"}; | |
390 | ||
391 | static char *follow_fork_mode_string = NULL; | |
392 | \f | |
393 | ||
c906108c SS |
394 | static void |
395 | follow_inferior_fork (parent_pid, child_pid, has_forked, has_vforked) | |
396 | int parent_pid; | |
397 | int child_pid; | |
398 | int has_forked; | |
399 | int has_vforked; | |
400 | { | |
401 | int followed_parent = 0; | |
402 | int followed_child = 0; | |
403 | int ima_clone = 0; | |
404 | ||
405 | /* Which process did the user want us to follow? */ | |
406 | char *follow_mode = | |
407 | savestring (follow_fork_mode_string, strlen (follow_fork_mode_string)); | |
408 | ||
409 | /* Or, did the user not know, and want us to ask? */ | |
410 | if (STREQ (follow_fork_mode_string, "ask")) | |
411 | { | |
412 | char requested_mode[100]; | |
413 | ||
414 | free (follow_mode); | |
415 | error ("\"ask\" mode NYI"); | |
416 | follow_mode = savestring (requested_mode, strlen (requested_mode)); | |
417 | } | |
418 | ||
419 | /* If we're to be following the parent, then detach from child_pid. | |
420 | We're already following the parent, so need do nothing explicit | |
421 | for it. */ | |
422 | if (STREQ (follow_mode, "parent")) | |
423 | { | |
424 | followed_parent = 1; | |
425 | ||
426 | /* We're already attached to the parent, by default. */ | |
427 | ||
428 | /* Before detaching from the child, remove all breakpoints from | |
429 | it. (This won't actually modify the breakpoint list, but will | |
430 | physically remove the breakpoints from the child.) */ | |
431 | if (!has_vforked || !follow_vfork_when_exec) | |
432 | { | |
433 | detach_breakpoints (child_pid); | |
7a292a7a | 434 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
c906108c | 435 | SOLIB_REMOVE_INFERIOR_HOOK (child_pid); |
7a292a7a | 436 | #endif |
c906108c SS |
437 | } |
438 | ||
439 | /* Detach from the child. */ | |
440 | dont_repeat (); | |
441 | ||
442 | target_require_detach (child_pid, "", 1); | |
443 | } | |
444 | ||
445 | /* If we're to be following the child, then attach to it, detach | |
446 | from inferior_pid, and set inferior_pid to child_pid. */ | |
447 | else if (STREQ (follow_mode, "child")) | |
448 | { | |
449 | char child_pid_spelling[100]; /* Arbitrary length. */ | |
450 | ||
451 | followed_child = 1; | |
452 | ||
453 | /* Before detaching from the parent, detach all breakpoints from | |
454 | the child. But only if we're forking, or if we follow vforks | |
455 | as soon as they happen. (If we're following vforks only when | |
456 | the child has exec'd, then it's very wrong to try to write | |
457 | back the "shadow contents" of inserted breakpoints now -- they | |
458 | belong to the child's pre-exec'd a.out.) */ | |
459 | if (!has_vforked || !follow_vfork_when_exec) | |
460 | { | |
461 | detach_breakpoints (child_pid); | |
462 | } | |
463 | ||
464 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
465 | remove_breakpoints (); | |
466 | ||
467 | /* Also reset the solib inferior hook from the parent. */ | |
7a292a7a | 468 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
c906108c | 469 | SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid); |
7a292a7a | 470 | #endif |
c906108c SS |
471 | |
472 | /* Detach from the parent. */ | |
473 | dont_repeat (); | |
474 | target_detach (NULL, 1); | |
475 | ||
476 | /* Attach to the child. */ | |
477 | inferior_pid = child_pid; | |
478 | sprintf (child_pid_spelling, "%d", child_pid); | |
479 | dont_repeat (); | |
480 | ||
481 | target_require_attach (child_pid_spelling, 1); | |
482 | ||
483 | /* Was there a step_resume breakpoint? (There was if the user | |
484 | did a "next" at the fork() call.) If so, explicitly reset its | |
485 | thread number. | |
486 | ||
487 | step_resumes are a form of bp that are made to be per-thread. | |
488 | Since we created the step_resume bp when the parent process | |
489 | was being debugged, and now are switching to the child process, | |
490 | from the breakpoint package's viewpoint, that's a switch of | |
491 | "threads". We must update the bp's notion of which thread | |
492 | it is for, or it'll be ignored when it triggers... */ | |
493 | if (step_resume_breakpoint && | |
494 | (!has_vforked || !follow_vfork_when_exec)) | |
495 | breakpoint_re_set_thread (step_resume_breakpoint); | |
496 | ||
497 | /* Reinsert all breakpoints in the child. (The user may've set | |
498 | breakpoints after catching the fork, in which case those | |
499 | actually didn't get set in the child, but only in the parent.) */ | |
500 | if (!has_vforked || !follow_vfork_when_exec) | |
501 | { | |
502 | breakpoint_re_set (); | |
503 | insert_breakpoints (); | |
504 | } | |
505 | } | |
506 | ||
507 | /* If we're to be following both parent and child, then fork ourselves, | |
508 | and attach the debugger clone to the child. */ | |
509 | else if (STREQ (follow_mode, "both")) | |
510 | { | |
511 | char pid_suffix[100]; /* Arbitrary length. */ | |
512 | ||
513 | /* Clone ourselves to follow the child. This is the end of our | |
514 | involvement with child_pid; our clone will take it from here... */ | |
515 | dont_repeat (); | |
516 | target_clone_and_follow_inferior (child_pid, &followed_child); | |
517 | followed_parent = !followed_child; | |
518 | ||
519 | /* We continue to follow the parent. To help distinguish the two | |
520 | debuggers, though, both we and our clone will reset our prompts. */ | |
521 | sprintf (pid_suffix, "[%d] ", inferior_pid); | |
522 | set_prompt (strcat (get_prompt (), pid_suffix)); | |
523 | } | |
524 | ||
525 | /* The parent and child of a vfork share the same address space. | |
526 | Also, on some targets the order in which vfork and exec events | |
527 | are received for parent in child requires some delicate handling | |
528 | of the events. | |
529 | ||
530 | For instance, on ptrace-based HPUX we receive the child's vfork | |
531 | event first, at which time the parent has been suspended by the | |
532 | OS and is essentially untouchable until the child's exit or second | |
533 | exec event arrives. At that time, the parent's vfork event is | |
534 | delivered to us, and that's when we see and decide how to follow | |
535 | the vfork. But to get to that point, we must continue the child | |
536 | until it execs or exits. To do that smoothly, all breakpoints | |
537 | must be removed from the child, in case there are any set between | |
538 | the vfork() and exec() calls. But removing them from the child | |
539 | also removes them from the parent, due to the shared-address-space | |
540 | nature of a vfork'd parent and child. On HPUX, therefore, we must | |
541 | take care to restore the bp's to the parent before we continue it. | |
542 | Else, it's likely that we may not stop in the expected place. (The | |
543 | worst scenario is when the user tries to step over a vfork() call; | |
544 | the step-resume bp must be restored for the step to properly stop | |
545 | in the parent after the call completes!) | |
546 | ||
547 | Sequence of events, as reported to gdb from HPUX: | |
548 | ||
549 | Parent Child Action for gdb to take | |
550 | ------------------------------------------------------- | |
551 | 1 VFORK Continue child | |
552 | 2 EXEC | |
553 | 3 EXEC or EXIT | |
554 | 4 VFORK */ | |
555 | if (has_vforked) | |
556 | { | |
557 | target_post_follow_vfork (parent_pid, | |
558 | followed_parent, | |
559 | child_pid, | |
560 | followed_child); | |
561 | } | |
562 | ||
563 | pending_follow.fork_event.saw_parent_fork = 0; | |
564 | pending_follow.fork_event.saw_child_fork = 0; | |
565 | ||
566 | free (follow_mode); | |
567 | } | |
568 | ||
569 | static void | |
570 | follow_fork (parent_pid, child_pid) | |
571 | int parent_pid; | |
572 | int child_pid; | |
573 | { | |
574 | follow_inferior_fork (parent_pid, child_pid, 1, 0); | |
575 | } | |
576 | ||
577 | ||
578 | /* Forward declaration. */ | |
579 | static void follow_exec PARAMS ((int, char *)); | |
580 | ||
581 | static void | |
582 | follow_vfork (parent_pid, child_pid) | |
583 | int parent_pid; | |
584 | int child_pid; | |
585 | { | |
586 | follow_inferior_fork (parent_pid, child_pid, 0, 1); | |
587 | ||
588 | /* Did we follow the child? Had it exec'd before we saw the parent vfork? */ | |
589 | if (pending_follow.fork_event.saw_child_exec && (inferior_pid == child_pid)) | |
590 | { | |
591 | pending_follow.fork_event.saw_child_exec = 0; | |
592 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
593 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
594 | free (pending_follow.execd_pathname); | |
595 | } | |
596 | } | |
c906108c SS |
597 | |
598 | static void | |
599 | follow_exec (pid, execd_pathname) | |
600 | int pid; | |
601 | char *execd_pathname; | |
602 | { | |
c906108c | 603 | int saved_pid = pid; |
7a292a7a SS |
604 | struct target_ops *tgt; |
605 | ||
606 | if (!may_follow_exec) | |
607 | return; | |
c906108c SS |
608 | |
609 | /* Did this exec() follow a vfork()? If so, we must follow the | |
610 | vfork now too. Do it before following the exec. */ | |
611 | if (follow_vfork_when_exec && | |
612 | (pending_follow.kind == TARGET_WAITKIND_VFORKED)) | |
613 | { | |
614 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
615 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
616 | follow_vfork_when_exec = 0; | |
617 | saved_pid = inferior_pid; | |
618 | ||
619 | /* Did we follow the parent? If so, we're done. If we followed | |
620 | the child then we must also follow its exec(). */ | |
621 | if (inferior_pid == pending_follow.fork_event.parent_pid) | |
622 | return; | |
623 | } | |
624 | ||
625 | /* This is an exec event that we actually wish to pay attention to. | |
626 | Refresh our symbol table to the newly exec'd program, remove any | |
627 | momentary bp's, etc. | |
628 | ||
629 | If there are breakpoints, they aren't really inserted now, | |
630 | since the exec() transformed our inferior into a fresh set | |
631 | of instructions. | |
632 | ||
633 | We want to preserve symbolic breakpoints on the list, since | |
634 | we have hopes that they can be reset after the new a.out's | |
635 | symbol table is read. | |
636 | ||
637 | However, any "raw" breakpoints must be removed from the list | |
638 | (e.g., the solib bp's), since their address is probably invalid | |
639 | now. | |
640 | ||
641 | And, we DON'T want to call delete_breakpoints() here, since | |
642 | that may write the bp's "shadow contents" (the instruction | |
643 | value that was overwritten witha TRAP instruction). Since | |
644 | we now have a new a.out, those shadow contents aren't valid. */ | |
645 | update_breakpoints_after_exec (); | |
646 | ||
647 | /* If there was one, it's gone now. We cannot truly step-to-next | |
648 | statement through an exec(). */ | |
649 | step_resume_breakpoint = NULL; | |
650 | step_range_start = 0; | |
651 | step_range_end = 0; | |
652 | ||
653 | /* If there was one, it's gone now. */ | |
654 | through_sigtramp_breakpoint = NULL; | |
655 | ||
656 | /* What is this a.out's name? */ | |
657 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
658 | ||
659 | /* We've followed the inferior through an exec. Therefore, the | |
660 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
661 | |
662 | /* First collect the run target in effect. */ | |
663 | tgt = find_run_target (); | |
664 | /* If we can't find one, things are in a very strange state... */ | |
665 | if (tgt == NULL) | |
666 | error ("Could find run target to save before following exec"); | |
667 | ||
c906108c SS |
668 | gdb_flush (gdb_stdout); |
669 | target_mourn_inferior (); | |
7a292a7a SS |
670 | inferior_pid = saved_pid; /* Because mourn_inferior resets inferior_pid. */ |
671 | push_target (tgt); | |
c906108c SS |
672 | |
673 | /* That a.out is now the one to use. */ | |
674 | exec_file_attach (execd_pathname, 0); | |
675 | ||
676 | /* And also is where symbols can be found. */ | |
677 | symbol_file_command (execd_pathname, 0); | |
678 | ||
679 | /* Reset the shared library package. This ensures that we get | |
680 | a shlib event when the child reaches "_start", at which point | |
681 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 682 | #if defined(SOLIB_RESTART) |
c906108c | 683 | SOLIB_RESTART (); |
7a292a7a SS |
684 | #endif |
685 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
c906108c | 686 | SOLIB_CREATE_INFERIOR_HOOK (inferior_pid); |
7a292a7a | 687 | #endif |
c906108c SS |
688 | |
689 | /* Reinsert all breakpoints. (Those which were symbolic have | |
690 | been reset to the proper address in the new a.out, thanks | |
691 | to symbol_file_command...) */ | |
692 | insert_breakpoints (); | |
693 | ||
694 | /* The next resume of this inferior should bring it to the shlib | |
695 | startup breakpoints. (If the user had also set bp's on | |
696 | "main" from the old (parent) process, then they'll auto- | |
697 | matically get reset there in the new process.) */ | |
c906108c SS |
698 | } |
699 | ||
700 | /* Non-zero if we just simulating a single-step. This is needed | |
701 | because we cannot remove the breakpoints in the inferior process | |
702 | until after the `wait' in `wait_for_inferior'. */ | |
703 | static int singlestep_breakpoints_inserted_p = 0; | |
704 | \f | |
705 | ||
706 | /* Things to clean up if we QUIT out of resume (). */ | |
707 | /* ARGSUSED */ | |
708 | static void | |
709 | resume_cleanups (arg) | |
710 | int arg; | |
711 | { | |
712 | normal_stop (); | |
713 | } | |
714 | ||
715 | static char schedlock_off[] = "off"; | |
716 | static char schedlock_on[] = "on"; | |
717 | static char schedlock_step[] = "step"; | |
718 | static char *scheduler_mode = schedlock_off; | |
719 | static char *scheduler_enums[] = | |
720 | {schedlock_off, schedlock_on, schedlock_step}; | |
721 | ||
722 | static void | |
723 | set_schedlock_func (args, from_tty, c) | |
724 | char *args; | |
725 | int from_tty; | |
726 | struct cmd_list_element *c; | |
727 | { | |
728 | if (c->type == set_cmd) | |
729 | if (!target_can_lock_scheduler) | |
730 | { | |
731 | scheduler_mode = schedlock_off; | |
732 | error ("Target '%s' cannot support this command.", | |
733 | target_shortname); | |
734 | } | |
735 | } | |
736 | ||
737 | ||
738 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
739 | wants to interrupt some lengthy single-stepping operation | |
740 | (for child processes, the SIGINT goes to the inferior, and so | |
741 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
742 | other targets, that's not true). | |
743 | ||
744 | STEP nonzero if we should step (zero to continue instead). | |
745 | SIG is the signal to give the inferior (zero for none). */ | |
746 | void | |
747 | resume (step, sig) | |
748 | int step; | |
749 | enum target_signal sig; | |
750 | { | |
751 | int should_resume = 1; | |
752 | struct cleanup *old_cleanups = make_cleanup ((make_cleanup_func) | |
753 | resume_cleanups, 0); | |
754 | QUIT; | |
755 | ||
756 | #ifdef CANNOT_STEP_BREAKPOINT | |
757 | /* Most targets can step a breakpoint instruction, thus executing it | |
758 | normally. But if this one cannot, just continue and we will hit | |
759 | it anyway. */ | |
760 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
761 | step = 0; | |
762 | #endif | |
763 | ||
764 | if (SOFTWARE_SINGLE_STEP_P && step) | |
765 | { | |
766 | /* Do it the hard way, w/temp breakpoints */ | |
767 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints*/ ); | |
768 | /* ...and don't ask hardware to do it. */ | |
769 | step = 0; | |
770 | /* and do not pull these breakpoints until after a `wait' in | |
771 | `wait_for_inferior' */ | |
772 | singlestep_breakpoints_inserted_p = 1; | |
773 | } | |
774 | ||
775 | /* Handle any optimized stores to the inferior NOW... */ | |
776 | #ifdef DO_DEFERRED_STORES | |
777 | DO_DEFERRED_STORES; | |
778 | #endif | |
779 | ||
c906108c SS |
780 | /* If there were any forks/vforks/execs that were caught and are |
781 | now to be followed, then do so. */ | |
782 | switch (pending_follow.kind) | |
783 | { | |
784 | case (TARGET_WAITKIND_FORKED): | |
785 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
786 | follow_fork (inferior_pid, pending_follow.fork_event.child_pid); | |
787 | break; | |
788 | ||
789 | case (TARGET_WAITKIND_VFORKED): | |
790 | { | |
791 | int saw_child_exec = pending_follow.fork_event.saw_child_exec; | |
792 | ||
793 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
794 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
795 | ||
796 | /* Did we follow the child, but not yet see the child's exec event? | |
797 | If so, then it actually ought to be waiting for us; we respond to | |
798 | parent vfork events. We don't actually want to resume the child | |
799 | in this situation; we want to just get its exec event. */ | |
800 | if (!saw_child_exec && | |
801 | (inferior_pid == pending_follow.fork_event.child_pid)) | |
802 | should_resume = 0; | |
803 | } | |
804 | break; | |
805 | ||
806 | case (TARGET_WAITKIND_EXECD): | |
807 | /* If we saw a vfork event but couldn't follow it until we saw | |
808 | an exec, then now might be the time! */ | |
809 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
810 | /* follow_exec is called as soon as the exec event is seen. */ | |
811 | break; | |
812 | ||
813 | default: | |
814 | break; | |
815 | } | |
c906108c SS |
816 | |
817 | /* Install inferior's terminal modes. */ | |
818 | target_terminal_inferior (); | |
819 | ||
820 | if (should_resume) | |
821 | { | |
7a292a7a | 822 | if (use_thread_step_needed && thread_step_needed) |
c906108c SS |
823 | { |
824 | /* We stopped on a BPT instruction; | |
825 | don't continue other threads and | |
826 | just step this thread. */ | |
827 | thread_step_needed = 0; | |
828 | ||
829 | if (!breakpoint_here_p (read_pc ())) | |
830 | { | |
831 | /* Breakpoint deleted: ok to do regular resume | |
832 | where all the threads either step or continue. */ | |
833 | target_resume (-1, step, sig); | |
834 | } | |
835 | else | |
836 | { | |
837 | if (!step) | |
838 | { | |
839 | warning ("Internal error, changing continue to step."); | |
840 | remove_breakpoints (); | |
841 | breakpoints_inserted = 0; | |
842 | trap_expected = 1; | |
843 | step = 1; | |
844 | } | |
845 | ||
846 | target_resume (inferior_pid, step, sig); | |
847 | } | |
848 | } | |
849 | else | |
c906108c SS |
850 | { |
851 | /* Vanilla resume. */ | |
852 | ||
853 | if ((scheduler_mode == schedlock_on) || | |
854 | (scheduler_mode == schedlock_step && step != 0)) | |
855 | target_resume (inferior_pid, step, sig); | |
856 | else | |
857 | target_resume (-1, step, sig); | |
858 | } | |
859 | } | |
860 | ||
861 | discard_cleanups (old_cleanups); | |
862 | } | |
863 | \f | |
864 | ||
865 | /* Clear out all variables saying what to do when inferior is continued. | |
866 | First do this, then set the ones you want, then call `proceed'. */ | |
867 | ||
868 | void | |
869 | clear_proceed_status () | |
870 | { | |
871 | trap_expected = 0; | |
872 | step_range_start = 0; | |
873 | step_range_end = 0; | |
874 | step_frame_address = 0; | |
875 | step_over_calls = -1; | |
876 | stop_after_trap = 0; | |
877 | stop_soon_quietly = 0; | |
878 | proceed_to_finish = 0; | |
879 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
880 | ||
881 | /* Discard any remaining commands or status from previous stop. */ | |
882 | bpstat_clear (&stop_bpstat); | |
883 | } | |
884 | ||
885 | /* Basic routine for continuing the program in various fashions. | |
886 | ||
887 | ADDR is the address to resume at, or -1 for resume where stopped. | |
888 | SIGGNAL is the signal to give it, or 0 for none, | |
889 | or -1 for act according to how it stopped. | |
890 | STEP is nonzero if should trap after one instruction. | |
891 | -1 means return after that and print nothing. | |
892 | You should probably set various step_... variables | |
893 | before calling here, if you are stepping. | |
894 | ||
895 | You should call clear_proceed_status before calling proceed. */ | |
896 | ||
897 | void | |
898 | proceed (addr, siggnal, step) | |
899 | CORE_ADDR addr; | |
900 | enum target_signal siggnal; | |
901 | int step; | |
902 | { | |
903 | int oneproc = 0; | |
904 | ||
905 | if (step > 0) | |
906 | step_start_function = find_pc_function (read_pc ()); | |
907 | if (step < 0) | |
908 | stop_after_trap = 1; | |
909 | ||
910 | if (addr == (CORE_ADDR) - 1) | |
911 | { | |
912 | /* If there is a breakpoint at the address we will resume at, | |
913 | step one instruction before inserting breakpoints | |
914 | so that we do not stop right away (and report a second | |
915 | hit at this breakpoint). */ | |
916 | ||
917 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) | |
918 | oneproc = 1; | |
919 | ||
920 | #ifndef STEP_SKIPS_DELAY | |
921 | #define STEP_SKIPS_DELAY(pc) (0) | |
922 | #define STEP_SKIPS_DELAY_P (0) | |
923 | #endif | |
924 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
925 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY | |
926 | is slow (it needs to read memory from the target). */ | |
927 | if (STEP_SKIPS_DELAY_P | |
928 | && breakpoint_here_p (read_pc () + 4) | |
929 | && STEP_SKIPS_DELAY (read_pc ())) | |
930 | oneproc = 1; | |
931 | } | |
932 | else | |
933 | { | |
934 | write_pc (addr); | |
935 | ||
936 | /* New address; we don't need to single-step a thread | |
937 | over a breakpoint we just hit, 'cause we aren't | |
938 | continuing from there. | |
939 | ||
940 | It's not worth worrying about the case where a user | |
941 | asks for a "jump" at the current PC--if they get the | |
942 | hiccup of re-hiting a hit breakpoint, what else do | |
943 | they expect? */ | |
944 | thread_step_needed = 0; | |
945 | } | |
946 | ||
947 | #ifdef PREPARE_TO_PROCEED | |
948 | /* In a multi-threaded task we may select another thread | |
949 | and then continue or step. | |
950 | ||
951 | But if the old thread was stopped at a breakpoint, it | |
952 | will immediately cause another breakpoint stop without | |
953 | any execution (i.e. it will report a breakpoint hit | |
954 | incorrectly). So we must step over it first. | |
955 | ||
956 | PREPARE_TO_PROCEED checks the current thread against the thread | |
957 | that reported the most recent event. If a step-over is required | |
958 | it returns TRUE and sets the current thread to the old thread. */ | |
9e086581 | 959 | if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ())) |
c906108c SS |
960 | { |
961 | oneproc = 1; | |
962 | thread_step_needed = 1; | |
963 | } | |
964 | ||
965 | #endif /* PREPARE_TO_PROCEED */ | |
966 | ||
967 | #ifdef HP_OS_BUG | |
968 | if (trap_expected_after_continue) | |
969 | { | |
970 | /* If (step == 0), a trap will be automatically generated after | |
971 | the first instruction is executed. Force step one | |
972 | instruction to clear this condition. This should not occur | |
973 | if step is nonzero, but it is harmless in that case. */ | |
974 | oneproc = 1; | |
975 | trap_expected_after_continue = 0; | |
976 | } | |
977 | #endif /* HP_OS_BUG */ | |
978 | ||
979 | if (oneproc) | |
980 | /* We will get a trace trap after one instruction. | |
981 | Continue it automatically and insert breakpoints then. */ | |
982 | trap_expected = 1; | |
983 | else | |
984 | { | |
985 | int temp = insert_breakpoints (); | |
986 | if (temp) | |
987 | { | |
988 | print_sys_errmsg ("ptrace", temp); | |
989 | error ("Cannot insert breakpoints.\n\ | |
990 | The same program may be running in another process."); | |
991 | } | |
992 | ||
993 | breakpoints_inserted = 1; | |
994 | } | |
995 | ||
996 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
997 | stop_signal = siggnal; | |
998 | /* If this signal should not be seen by program, | |
999 | give it zero. Used for debugging signals. */ | |
1000 | else if (!signal_program[stop_signal]) | |
1001 | stop_signal = TARGET_SIGNAL_0; | |
1002 | ||
1003 | annotate_starting (); | |
1004 | ||
1005 | /* Make sure that output from GDB appears before output from the | |
1006 | inferior. */ | |
1007 | gdb_flush (gdb_stdout); | |
1008 | ||
1009 | /* Resume inferior. */ | |
1010 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
1011 | ||
1012 | /* Wait for it to stop (if not standalone) | |
1013 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
1014 | /* Do this only if we are not using the event loop, or if the target |
1015 | does not support asynchronous execution. */ | |
1016 | if (!async_p || !target_has_async) | |
1017 | { | |
1018 | wait_for_inferior (); | |
1019 | normal_stop (); | |
1020 | } | |
c906108c SS |
1021 | } |
1022 | ||
1023 | /* Record the pc and sp of the program the last time it stopped. | |
1024 | These are just used internally by wait_for_inferior, but need | |
1025 | to be preserved over calls to it and cleared when the inferior | |
1026 | is started. */ | |
1027 | static CORE_ADDR prev_pc; | |
1028 | static CORE_ADDR prev_func_start; | |
1029 | static char *prev_func_name; | |
1030 | \f | |
1031 | ||
1032 | /* Start remote-debugging of a machine over a serial link. */ | |
c906108c SS |
1033 | void |
1034 | start_remote () | |
1035 | { | |
1036 | init_thread_list (); | |
1037 | init_wait_for_inferior (); | |
1038 | stop_soon_quietly = 1; | |
1039 | trap_expected = 0; | |
43ff13b4 JM |
1040 | |
1041 | /* Go on waiting only in case gdb is not started in async mode, or | |
1042 | in case the target doesn't support async execution. */ | |
1043 | if (!async_p || !target_has_async) | |
1044 | { | |
1045 | wait_for_inferior (); | |
1046 | normal_stop (); | |
1047 | } | |
1048 | else | |
1049 | { | |
1050 | /* The 'tar rem' command should always look synchronous, | |
1051 | i.e. display the prompt only once it has connected and | |
1052 | started the target. */ | |
1053 | sync_execution = 1; | |
1054 | push_prompt ("", "", ""); | |
1055 | delete_file_handler (input_fd); | |
1056 | target_executing = 1; | |
1057 | } | |
c906108c SS |
1058 | } |
1059 | ||
1060 | /* Initialize static vars when a new inferior begins. */ | |
1061 | ||
1062 | void | |
1063 | init_wait_for_inferior () | |
1064 | { | |
1065 | /* These are meaningless until the first time through wait_for_inferior. */ | |
1066 | prev_pc = 0; | |
1067 | prev_func_start = 0; | |
1068 | prev_func_name = NULL; | |
1069 | ||
1070 | #ifdef HP_OS_BUG | |
1071 | trap_expected_after_continue = 0; | |
1072 | #endif | |
1073 | breakpoints_inserted = 0; | |
1074 | breakpoint_init_inferior (inf_starting); | |
1075 | ||
1076 | /* Don't confuse first call to proceed(). */ | |
1077 | stop_signal = TARGET_SIGNAL_0; | |
1078 | ||
1079 | /* The first resume is not following a fork/vfork/exec. */ | |
1080 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
1081 | pending_follow.fork_event.saw_parent_fork = 0; | |
1082 | pending_follow.fork_event.saw_child_fork = 0; | |
1083 | pending_follow.fork_event.saw_child_exec = 0; | |
1084 | ||
1085 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
1086 | number_of_threads_in_syscalls = 0; | |
1087 | ||
1088 | clear_proceed_status (); | |
1089 | } | |
1090 | ||
1091 | static void | |
1092 | delete_breakpoint_current_contents (arg) | |
1093 | PTR arg; | |
1094 | { | |
1095 | struct breakpoint **breakpointp = (struct breakpoint **) arg; | |
1096 | if (*breakpointp != NULL) | |
1097 | { | |
1098 | delete_breakpoint (*breakpointp); | |
1099 | *breakpointp = NULL; | |
1100 | } | |
1101 | } | |
1102 | \f | |
b83266a0 SS |
1103 | /* This enum encodes possible reasons for doing a target_wait, so that |
1104 | wfi can call target_wait in one place. (Ultimately the call will be | |
1105 | moved out of the infinite loop entirely.) */ | |
1106 | ||
cd0fc7c3 SS |
1107 | enum infwait_states { |
1108 | infwait_normal_state, | |
1109 | infwait_thread_hop_state, | |
1110 | infwait_nullified_state, | |
1111 | infwait_nonstep_watch_state | |
b83266a0 SS |
1112 | }; |
1113 | ||
cd0fc7c3 SS |
1114 | /* This structure contains what used to be local variables in |
1115 | wait_for_inferior. Probably many of them can return to being | |
1116 | locals in handle_inferior_event. */ | |
1117 | ||
1118 | struct execution_control_state { | |
1119 | struct target_waitstatus ws; | |
1120 | struct target_waitstatus *wp; | |
c906108c | 1121 | int another_trap; |
cd0fc7c3 | 1122 | int random_signal; |
c906108c SS |
1123 | CORE_ADDR stop_func_start; |
1124 | CORE_ADDR stop_func_end; | |
1125 | char *stop_func_name; | |
c906108c | 1126 | struct symtab_and_line sal; |
cd0fc7c3 | 1127 | int remove_breakpoints_on_following_step; |
c906108c SS |
1128 | int current_line; |
1129 | struct symtab *current_symtab; | |
cd0fc7c3 | 1130 | int handling_longjmp; /* FIXME */ |
c906108c SS |
1131 | int pid; |
1132 | int saved_inferior_pid; | |
cd0fc7c3 SS |
1133 | int update_step_sp; |
1134 | int stepping_through_solib_after_catch; | |
1135 | bpstat stepping_through_solib_catchpoints; | |
1136 | int enable_hw_watchpoints_after_wait; | |
1137 | int stepping_through_sigtramp; | |
c906108c | 1138 | int new_thread_event; |
b83266a0 | 1139 | struct target_waitstatus tmpstatus; |
cd0fc7c3 | 1140 | enum infwait_states infwait_state; |
b83266a0 | 1141 | int waiton_pid; |
cd0fc7c3 SS |
1142 | int wait_some_more; |
1143 | }; | |
1144 | ||
1145 | void init_execution_control_state PARAMS ((struct execution_control_state *ecs)); | |
1146 | ||
1147 | void handle_inferior_event PARAMS ((struct execution_control_state *ecs)); | |
1148 | ||
1149 | /* Wait for control to return from inferior to debugger. | |
1150 | If inferior gets a signal, we may decide to start it up again | |
1151 | instead of returning. That is why there is a loop in this function. | |
1152 | When this function actually returns it means the inferior | |
1153 | should be left stopped and GDB should read more commands. */ | |
1154 | ||
1155 | void | |
1156 | wait_for_inferior () | |
1157 | { | |
1158 | struct cleanup *old_cleanups; | |
1159 | struct execution_control_state ecss; | |
1160 | struct execution_control_state *ecs; | |
c906108c SS |
1161 | |
1162 | old_cleanups = make_cleanup (delete_breakpoint_current_contents, | |
1163 | &step_resume_breakpoint); | |
1164 | make_cleanup (delete_breakpoint_current_contents, | |
1165 | &through_sigtramp_breakpoint); | |
cd0fc7c3 SS |
1166 | |
1167 | /* wfi still stays in a loop, so it's OK just to take the address of | |
1168 | a local to get the ecs pointer. */ | |
1169 | ecs = &ecss; | |
1170 | ||
1171 | /* Fill in with reasonable starting values. */ | |
1172 | init_execution_control_state (ecs); | |
1173 | ||
c906108c SS |
1174 | thread_step_needed = 0; |
1175 | ||
c906108c | 1176 | /* We'll update this if & when we switch to a new thread. */ |
7a292a7a SS |
1177 | if (may_switch_from_inferior_pid) |
1178 | switched_from_inferior_pid = inferior_pid; | |
c906108c | 1179 | |
cd0fc7c3 SS |
1180 | overlay_cache_invalid = 1; |
1181 | ||
1182 | /* We have to invalidate the registers BEFORE calling target_wait | |
1183 | because they can be loaded from the target while in target_wait. | |
1184 | This makes remote debugging a bit more efficient for those | |
1185 | targets that provide critical registers as part of their normal | |
1186 | status mechanism. */ | |
1187 | ||
1188 | registers_changed (); | |
b83266a0 | 1189 | |
c906108c SS |
1190 | while (1) |
1191 | { | |
cd0fc7c3 SS |
1192 | if (target_wait_hook) |
1193 | ecs->pid = target_wait_hook (ecs->waiton_pid, ecs->wp); | |
1194 | else | |
1195 | ecs->pid = target_wait (ecs->waiton_pid, ecs->wp); | |
c906108c | 1196 | |
cd0fc7c3 SS |
1197 | /* Now figure out what to do with the result of the result. */ |
1198 | handle_inferior_event (ecs); | |
c906108c | 1199 | |
cd0fc7c3 SS |
1200 | if (!ecs->wait_some_more) |
1201 | break; | |
1202 | } | |
1203 | do_cleanups (old_cleanups); | |
1204 | } | |
c906108c | 1205 | |
43ff13b4 JM |
1206 | /* Asynchronous version of wait_for_inferior. It is called by the |
1207 | event loop whenever a change of state is detected on the file | |
1208 | descriptor corresponding to the target. It can be called more than | |
1209 | once to complete a single execution command. In such cases we need | |
1210 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1211 | last time that this function is called for a single execution | |
1212 | command, then report to the user that the inferior has stopped, and | |
1213 | do the necessary cleanups. */ | |
1214 | ||
1215 | struct execution_control_state async_ecss; | |
1216 | struct execution_control_state *async_ecs; | |
1217 | ||
1218 | void | |
1219 | fetch_inferior_event () | |
1220 | { | |
1221 | static struct cleanup *old_cleanups; | |
1222 | ||
1223 | async_ecs = &async_ecss; | |
1224 | ||
1225 | if (!async_ecs->wait_some_more) | |
1226 | { | |
1227 | old_cleanups = make_exec_cleanup (delete_breakpoint_current_contents, | |
1228 | &step_resume_breakpoint); | |
1229 | make_exec_cleanup (delete_breakpoint_current_contents, | |
1230 | &through_sigtramp_breakpoint); | |
1231 | ||
1232 | /* Fill in with reasonable starting values. */ | |
1233 | init_execution_control_state (async_ecs); | |
1234 | ||
1235 | thread_step_needed = 0; | |
1236 | ||
1237 | /* We'll update this if & when we switch to a new thread. */ | |
1238 | if (may_switch_from_inferior_pid) | |
1239 | switched_from_inferior_pid = inferior_pid; | |
1240 | ||
1241 | overlay_cache_invalid = 1; | |
1242 | ||
1243 | /* We have to invalidate the registers BEFORE calling target_wait | |
1244 | because they can be loaded from the target while in target_wait. | |
1245 | This makes remote debugging a bit more efficient for those | |
1246 | targets that provide critical registers as part of their normal | |
1247 | status mechanism. */ | |
1248 | ||
1249 | registers_changed (); | |
1250 | } | |
1251 | ||
1252 | if (target_wait_hook) | |
1253 | async_ecs->pid = target_wait_hook (async_ecs->waiton_pid, async_ecs->wp); | |
1254 | else | |
1255 | async_ecs->pid = target_wait (async_ecs->waiton_pid, async_ecs->wp); | |
1256 | ||
1257 | /* Now figure out what to do with the result of the result. */ | |
1258 | handle_inferior_event (async_ecs); | |
1259 | ||
1260 | if (!async_ecs->wait_some_more) | |
1261 | { | |
1262 | do_exec_cleanups (old_cleanups); | |
1263 | normal_stop (); | |
1264 | /* Is there anything left to do for the command issued to | |
1265 | complete? */ | |
1266 | do_all_continuations (); | |
1267 | /* Reset things after target has stopped for the async commands. */ | |
1268 | complete_execution (); | |
1269 | } | |
1270 | } | |
1271 | ||
cd0fc7c3 SS |
1272 | /* Prepare an execution control state for looping through a |
1273 | wait_for_inferior-type loop. */ | |
1274 | ||
1275 | void | |
1276 | init_execution_control_state (ecs) | |
1277 | struct execution_control_state *ecs; | |
1278 | { | |
1279 | ecs->random_signal = 0; | |
1280 | ecs->remove_breakpoints_on_following_step = 0; | |
1281 | ecs->handling_longjmp = 0; /* FIXME */ | |
1282 | ecs->update_step_sp = 0; | |
1283 | ecs->stepping_through_solib_after_catch = 0; | |
1284 | ecs->stepping_through_solib_catchpoints = NULL; | |
1285 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1286 | ecs->stepping_through_sigtramp = 0; | |
1287 | ecs->sal = find_pc_line (prev_pc, 0); | |
1288 | ecs->current_line = ecs->sal.line; | |
1289 | ecs->current_symtab = ecs->sal.symtab; | |
1290 | ecs->infwait_state = infwait_normal_state; | |
1291 | ecs->waiton_pid = -1; | |
1292 | ecs->wp = &(ecs->ws); | |
1293 | } | |
1294 | ||
1295 | /* Given an execution control state that has been freshly filled in | |
1296 | by an event from the inferior, figure out what it means and take | |
1297 | appropriate action. */ | |
c906108c | 1298 | |
cd0fc7c3 SS |
1299 | void |
1300 | handle_inferior_event (ecs) | |
1301 | struct execution_control_state *ecs; | |
1302 | { | |
1303 | CORE_ADDR tmp; | |
1304 | int stepped_after_stopped_by_watchpoint; | |
1305 | ||
1306 | /* Keep this extra brace for now, minimizes diffs. */ | |
1307 | { | |
1308 | switch (ecs->infwait_state) | |
c906108c | 1309 | { |
cd0fc7c3 | 1310 | case infwait_normal_state: |
b83266a0 SS |
1311 | /* Since we've done a wait, we have a new event. Don't |
1312 | carry over any expectations about needing to step over a | |
1313 | breakpoint. */ | |
1314 | thread_step_needed = 0; | |
c906108c | 1315 | |
b83266a0 SS |
1316 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1317 | is serviced in this loop, below. */ | |
cd0fc7c3 | 1318 | if (ecs->enable_hw_watchpoints_after_wait) |
b83266a0 SS |
1319 | { |
1320 | TARGET_ENABLE_HW_WATCHPOINTS (inferior_pid); | |
cd0fc7c3 | 1321 | ecs->enable_hw_watchpoints_after_wait = 0; |
b83266a0 SS |
1322 | } |
1323 | stepped_after_stopped_by_watchpoint = 0; | |
1324 | break; | |
1325 | ||
cd0fc7c3 | 1326 | case infwait_thread_hop_state: |
b83266a0 | 1327 | insert_breakpoints (); |
c906108c | 1328 | |
b83266a0 SS |
1329 | /* We need to restart all the threads now, |
1330 | * unles we're running in scheduler-locked mode. | |
cd0fc7c3 | 1331 | * FIXME: shouldn't we look at currently_stepping ()? |
b83266a0 SS |
1332 | */ |
1333 | if (scheduler_mode == schedlock_on) | |
cd0fc7c3 | 1334 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); |
b83266a0 SS |
1335 | else |
1336 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
cd0fc7c3 SS |
1337 | ecs->infwait_state = infwait_normal_state; |
1338 | goto wfi_continue; | |
c906108c | 1339 | |
cd0fc7c3 | 1340 | case infwait_nullified_state: |
b83266a0 SS |
1341 | break; |
1342 | ||
cd0fc7c3 | 1343 | case infwait_nonstep_watch_state: |
b83266a0 SS |
1344 | insert_breakpoints (); |
1345 | ||
1346 | /* FIXME-maybe: is this cleaner than setting a flag? Does it | |
1347 | handle things like signals arriving and other things happening | |
1348 | in combination correctly? */ | |
1349 | stepped_after_stopped_by_watchpoint = 1; | |
1350 | break; | |
1351 | } | |
cd0fc7c3 | 1352 | ecs->infwait_state = infwait_normal_state; |
c906108c SS |
1353 | |
1354 | flush_cached_frames (); | |
1355 | ||
1356 | /* If it's a new process, add it to the thread database */ | |
1357 | ||
cd0fc7c3 | 1358 | ecs->new_thread_event = ((ecs->pid != inferior_pid) && !in_thread_list (ecs->pid)); |
c906108c | 1359 | |
cd0fc7c3 SS |
1360 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
1361 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
1362 | && ecs->new_thread_event) | |
c906108c | 1363 | { |
cd0fc7c3 | 1364 | add_thread (ecs->pid); |
c906108c | 1365 | |
cd0fc7c3 | 1366 | printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs->pid)); |
c906108c SS |
1367 | |
1368 | #if 0 | |
1369 | /* NOTE: This block is ONLY meant to be invoked in case of a | |
1370 | "thread creation event"! If it is invoked for any other | |
1371 | sort of event (such as a new thread landing on a breakpoint), | |
1372 | the event will be discarded, which is almost certainly | |
1373 | a bad thing! | |
1374 | ||
1375 | To avoid this, the low-level module (eg. target_wait) | |
1376 | should call in_thread_list and add_thread, so that the | |
1377 | new thread is known by the time we get here. */ | |
1378 | ||
1379 | /* We may want to consider not doing a resume here in order | |
1380 | to give the user a chance to play with the new thread. | |
1381 | It might be good to make that a user-settable option. */ | |
1382 | ||
1383 | /* At this point, all threads are stopped (happens | |
1384 | automatically in either the OS or the native code). | |
1385 | Therefore we need to continue all threads in order to | |
1386 | make progress. */ | |
1387 | ||
1388 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
cd0fc7c3 | 1389 | goto wfi_continue; |
c906108c SS |
1390 | #endif |
1391 | } | |
1392 | ||
cd0fc7c3 | 1393 | switch (ecs->ws.kind) |
c906108c SS |
1394 | { |
1395 | case TARGET_WAITKIND_LOADED: | |
1396 | /* Ignore gracefully during startup of the inferior, as it | |
1397 | might be the shell which has just loaded some objects, | |
1398 | otherwise add the symbols for the newly loaded objects. */ | |
1399 | #ifdef SOLIB_ADD | |
1400 | if (!stop_soon_quietly) | |
1401 | { | |
c906108c SS |
1402 | /* Remove breakpoints, SOLIB_ADD might adjust |
1403 | breakpoint addresses via breakpoint_re_set. */ | |
1404 | if (breakpoints_inserted) | |
1405 | remove_breakpoints (); | |
1406 | ||
1407 | /* Check for any newly added shared libraries if we're | |
1408 | supposed to be adding them automatically. */ | |
1409 | if (auto_solib_add) | |
1410 | { | |
1411 | /* Switch terminal for any messages produced by | |
1412 | breakpoint_re_set. */ | |
1413 | target_terminal_ours_for_output (); | |
1414 | SOLIB_ADD (NULL, 0, NULL); | |
1415 | target_terminal_inferior (); | |
1416 | } | |
1417 | ||
1418 | /* Reinsert breakpoints and continue. */ | |
1419 | if (breakpoints_inserted) | |
1420 | insert_breakpoints (); | |
1421 | } | |
1422 | #endif | |
1423 | resume (0, TARGET_SIGNAL_0); | |
cd0fc7c3 | 1424 | goto wfi_continue; |
c906108c SS |
1425 | |
1426 | case TARGET_WAITKIND_SPURIOUS: | |
1427 | resume (0, TARGET_SIGNAL_0); | |
cd0fc7c3 | 1428 | goto wfi_continue; |
c906108c SS |
1429 | |
1430 | case TARGET_WAITKIND_EXITED: | |
1431 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
cd0fc7c3 SS |
1432 | annotate_exited (ecs->ws.value.integer); |
1433 | if (ecs->ws.value.integer) | |
c906108c | 1434 | printf_filtered ("\nProgram exited with code 0%o.\n", |
cd0fc7c3 | 1435 | (unsigned int) ecs->ws.value.integer); |
c906108c SS |
1436 | else |
1437 | printf_filtered ("\nProgram exited normally.\n"); | |
1438 | ||
1439 | /* Record the exit code in the convenience variable $_exitcode, so | |
1440 | that the user can inspect this again later. */ | |
1441 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1442 | value_from_longest (builtin_type_int, | |
cd0fc7c3 | 1443 | (LONGEST) ecs->ws.value.integer)); |
c906108c SS |
1444 | gdb_flush (gdb_stdout); |
1445 | target_mourn_inferior (); | |
1446 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P*/ | |
1447 | stop_print_frame = 0; | |
1448 | goto stop_stepping; | |
1449 | ||
1450 | case TARGET_WAITKIND_SIGNALLED: | |
1451 | stop_print_frame = 0; | |
cd0fc7c3 | 1452 | stop_signal = ecs->ws.value.sig; |
c906108c SS |
1453 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1454 | annotate_signalled (); | |
1455 | ||
1456 | /* This looks pretty bogus to me. Doesn't TARGET_WAITKIND_SIGNALLED | |
1457 | mean it is already dead? This has been here since GDB 2.8, so | |
1458 | perhaps it means rms didn't understand unix waitstatuses? | |
1459 | For the moment I'm just kludging around this in remote.c | |
1460 | rather than trying to change it here --kingdon, 5 Dec 1994. */ | |
1461 | target_kill (); /* kill mourns as well */ | |
1462 | ||
1463 | printf_filtered ("\nProgram terminated with signal "); | |
1464 | annotate_signal_name (); | |
1465 | printf_filtered ("%s", target_signal_to_name (stop_signal)); | |
1466 | annotate_signal_name_end (); | |
1467 | printf_filtered (", "); | |
1468 | annotate_signal_string (); | |
1469 | printf_filtered ("%s", target_signal_to_string (stop_signal)); | |
1470 | annotate_signal_string_end (); | |
1471 | printf_filtered (".\n"); | |
1472 | ||
1473 | printf_filtered ("The program no longer exists.\n"); | |
1474 | gdb_flush (gdb_stdout); | |
1475 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P*/ | |
1476 | goto stop_stepping; | |
1477 | ||
1478 | /* The following are the only cases in which we keep going; | |
1479 | the above cases end in a continue or goto. */ | |
1480 | case TARGET_WAITKIND_FORKED: | |
1481 | stop_signal = TARGET_SIGNAL_TRAP; | |
cd0fc7c3 | 1482 | pending_follow.kind = ecs->ws.kind; |
c906108c SS |
1483 | |
1484 | /* Ignore fork events reported for the parent; we're only | |
1485 | interested in reacting to forks of the child. Note that | |
1486 | we expect the child's fork event to be available if we | |
1487 | waited for it now. */ | |
cd0fc7c3 | 1488 | if (inferior_pid == ecs->pid) |
c906108c SS |
1489 | { |
1490 | pending_follow.fork_event.saw_parent_fork = 1; | |
cd0fc7c3 SS |
1491 | pending_follow.fork_event.parent_pid = ecs->pid; |
1492 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
1493 | goto wfi_continue; | |
c906108c SS |
1494 | } |
1495 | else | |
1496 | { | |
1497 | pending_follow.fork_event.saw_child_fork = 1; | |
cd0fc7c3 SS |
1498 | pending_follow.fork_event.child_pid = ecs->pid; |
1499 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; | |
c906108c SS |
1500 | } |
1501 | ||
cd0fc7c3 SS |
1502 | stop_pc = read_pc_pid (ecs->pid); |
1503 | ecs->saved_inferior_pid = inferior_pid; | |
1504 | inferior_pid = ecs->pid; | |
c906108c SS |
1505 | stop_bpstat = bpstat_stop_status |
1506 | (&stop_pc, | |
7a292a7a SS |
1507 | (DECR_PC_AFTER_BREAK ? |
1508 | (prev_pc != stop_pc - DECR_PC_AFTER_BREAK | |
cd0fc7c3 | 1509 | && currently_stepping (ecs)) |
7a292a7a | 1510 | : 0) |
c906108c | 1511 | ); |
cd0fc7c3 SS |
1512 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1513 | inferior_pid = ecs->saved_inferior_pid; | |
c906108c SS |
1514 | goto process_event_stop_test; |
1515 | ||
1516 | /* If this a platform which doesn't allow a debugger to touch a | |
1517 | vfork'd inferior until after it exec's, then we'd best keep | |
1518 | our fingers entirely off the inferior, other than continuing | |
1519 | it. This has the unfortunate side-effect that catchpoints | |
1520 | of vforks will be ignored. But since the platform doesn't | |
1521 | allow the inferior be touched at vfork time, there's really | |
1522 | little choice. */ | |
1523 | case TARGET_WAITKIND_VFORKED: | |
1524 | stop_signal = TARGET_SIGNAL_TRAP; | |
cd0fc7c3 | 1525 | pending_follow.kind = ecs->ws.kind; |
c906108c SS |
1526 | |
1527 | /* Is this a vfork of the parent? If so, then give any | |
1528 | vfork catchpoints a chance to trigger now. (It's | |
1529 | dangerous to do so if the child canot be touched until | |
1530 | it execs, and the child has not yet exec'd. We probably | |
1531 | should warn the user to that effect when the catchpoint | |
1532 | triggers...) */ | |
cd0fc7c3 | 1533 | if (ecs->pid == inferior_pid) |
c906108c SS |
1534 | { |
1535 | pending_follow.fork_event.saw_parent_fork = 1; | |
cd0fc7c3 SS |
1536 | pending_follow.fork_event.parent_pid = ecs->pid; |
1537 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c SS |
1538 | } |
1539 | ||
1540 | /* If we've seen the child's vfork event but cannot really touch | |
1541 | the child until it execs, then we must continue the child now. | |
1542 | Else, give any vfork catchpoints a chance to trigger now. */ | |
1543 | else | |
1544 | { | |
1545 | pending_follow.fork_event.saw_child_fork = 1; | |
cd0fc7c3 SS |
1546 | pending_follow.fork_event.child_pid = ecs->pid; |
1547 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; | |
c906108c SS |
1548 | target_post_startup_inferior (pending_follow.fork_event.child_pid); |
1549 | follow_vfork_when_exec = !target_can_follow_vfork_prior_to_exec (); | |
1550 | if (follow_vfork_when_exec) | |
1551 | { | |
cd0fc7c3 SS |
1552 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); |
1553 | goto wfi_continue; | |
c906108c SS |
1554 | } |
1555 | } | |
1556 | ||
1557 | stop_pc = read_pc (); | |
1558 | stop_bpstat = bpstat_stop_status | |
1559 | (&stop_pc, | |
7a292a7a SS |
1560 | (DECR_PC_AFTER_BREAK ? |
1561 | (prev_pc != stop_pc - DECR_PC_AFTER_BREAK | |
cd0fc7c3 | 1562 | && currently_stepping (ecs)) |
7a292a7a SS |
1563 | : 0) |
1564 | ); | |
cd0fc7c3 | 1565 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
c906108c SS |
1566 | goto process_event_stop_test; |
1567 | ||
1568 | case TARGET_WAITKIND_EXECD: | |
1569 | stop_signal = TARGET_SIGNAL_TRAP; | |
1570 | ||
1571 | /* Is this a target which reports multiple exec events per actual | |
1572 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1573 | ignore all but the last one. Just resume the exec'r, and wait | |
1574 | for the next exec event. */ | |
1575 | if (inferior_ignoring_leading_exec_events) | |
1576 | { | |
1577 | inferior_ignoring_leading_exec_events--; | |
1578 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1579 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.parent_pid); | |
cd0fc7c3 SS |
1580 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); |
1581 | goto wfi_continue; | |
c906108c SS |
1582 | } |
1583 | inferior_ignoring_leading_exec_events = | |
1584 | target_reported_exec_events_per_exec_call () - 1; | |
1585 | ||
cd0fc7c3 SS |
1586 | pending_follow.execd_pathname = savestring (ecs->ws.value.execd_pathname, |
1587 | strlen (ecs->ws.value.execd_pathname)); | |
c906108c SS |
1588 | |
1589 | /* Did inferior_pid exec, or did a (possibly not-yet-followed) | |
1590 | child of a vfork exec? | |
1591 | ||
1592 | ??rehrauer: This is unabashedly an HP-UX specific thing. On | |
1593 | HP-UX, events associated with a vforking inferior come in | |
1594 | threes: a vfork event for the child (always first), followed | |
1595 | a vfork event for the parent and an exec event for the child. | |
1596 | The latter two can come in either order. | |
1597 | ||
1598 | If we get the parent vfork event first, life's good: We follow | |
1599 | either the parent or child, and then the child's exec event is | |
1600 | a "don't care". | |
1601 | ||
1602 | But if we get the child's exec event first, then we delay | |
1603 | responding to it until we handle the parent's vfork. Because, | |
1604 | otherwise we can't satisfy a "catch vfork". */ | |
1605 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1606 | { | |
1607 | pending_follow.fork_event.saw_child_exec = 1; | |
1608 | ||
1609 | /* On some targets, the child must be resumed before | |
1610 | the parent vfork event is delivered. A single-step | |
1611 | suffices. */ | |
1612 | if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) | |
cd0fc7c3 | 1613 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); |
c906108c | 1614 | /* We expect the parent vfork event to be available now. */ |
cd0fc7c3 | 1615 | goto wfi_continue; |
c906108c SS |
1616 | } |
1617 | ||
1618 | /* This causes the eventpoints and symbol table to be reset. Must | |
1619 | do this now, before trying to determine whether to stop. */ | |
1620 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
1621 | free (pending_follow.execd_pathname); | |
1622 | ||
cd0fc7c3 SS |
1623 | stop_pc = read_pc_pid (ecs->pid); |
1624 | ecs->saved_inferior_pid = inferior_pid; | |
1625 | inferior_pid = ecs->pid; | |
c906108c SS |
1626 | stop_bpstat = bpstat_stop_status |
1627 | (&stop_pc, | |
7a292a7a SS |
1628 | (DECR_PC_AFTER_BREAK ? |
1629 | (prev_pc != stop_pc - DECR_PC_AFTER_BREAK | |
cd0fc7c3 | 1630 | && currently_stepping (ecs)) |
7a292a7a SS |
1631 | : 0) |
1632 | ); | |
cd0fc7c3 SS |
1633 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1634 | inferior_pid = ecs->saved_inferior_pid; | |
c906108c SS |
1635 | goto process_event_stop_test; |
1636 | ||
1637 | /* These syscall events are returned on HP-UX, as part of its | |
1638 | implementation of page-protection-based "hardware" watchpoints. | |
1639 | HP-UX has unfortunate interactions between page-protections and | |
1640 | some system calls. Our solution is to disable hardware watches | |
1641 | when a system call is entered, and reenable them when the syscall | |
1642 | completes. The downside of this is that we may miss the precise | |
1643 | point at which a watched piece of memory is modified. "Oh well." | |
1644 | ||
1645 | Note that we may have multiple threads running, which may each | |
1646 | enter syscalls at roughly the same time. Since we don't have a | |
1647 | good notion currently of whether a watched piece of memory is | |
1648 | thread-private, we'd best not have any page-protections active | |
1649 | when any thread is in a syscall. Thus, we only want to reenable | |
1650 | hardware watches when no threads are in a syscall. | |
1651 | ||
1652 | Also, be careful not to try to gather much state about a thread | |
1653 | that's in a syscall. It's frequently a losing proposition. */ | |
1654 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1655 | number_of_threads_in_syscalls++; | |
1656 | if (number_of_threads_in_syscalls == 1) | |
1657 | { | |
1658 | TARGET_DISABLE_HW_WATCHPOINTS (inferior_pid); | |
1659 | } | |
1660 | resume (0, TARGET_SIGNAL_0); | |
cd0fc7c3 | 1661 | goto wfi_continue; |
c906108c SS |
1662 | |
1663 | /* Before examining the threads further, step this thread to | |
1664 | get it entirely out of the syscall. (We get notice of the | |
1665 | event when the thread is just on the verge of exiting a | |
1666 | syscall. Stepping one instruction seems to get it back | |
1667 | into user code.) | |
1668 | ||
1669 | Note that although the logical place to reenable h/w watches | |
1670 | is here, we cannot. We cannot reenable them before stepping | |
1671 | the thread (this causes the next wait on the thread to hang). | |
1672 | ||
1673 | Nor can we enable them after stepping until we've done a wait. | |
cd0fc7c3 | 1674 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait |
c906108c SS |
1675 | here, which will be serviced immediately after the target |
1676 | is waited on. */ | |
1677 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
cd0fc7c3 | 1678 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); |
c906108c SS |
1679 | |
1680 | if (number_of_threads_in_syscalls > 0) | |
1681 | { | |
1682 | number_of_threads_in_syscalls--; | |
cd0fc7c3 | 1683 | ecs->enable_hw_watchpoints_after_wait = |
c906108c SS |
1684 | (number_of_threads_in_syscalls == 0); |
1685 | } | |
cd0fc7c3 | 1686 | goto wfi_continue; |
c906108c SS |
1687 | |
1688 | case TARGET_WAITKIND_STOPPED: | |
cd0fc7c3 | 1689 | stop_signal = ecs->ws.value.sig; |
c906108c SS |
1690 | break; |
1691 | } | |
1692 | ||
1693 | /* We may want to consider not doing a resume here in order to give | |
1694 | the user a chance to play with the new thread. It might be good | |
1695 | to make that a user-settable option. */ | |
1696 | ||
1697 | /* At this point, all threads are stopped (happens automatically in | |
1698 | either the OS or the native code). Therefore we need to continue | |
1699 | all threads in order to make progress. */ | |
cd0fc7c3 | 1700 | if (ecs->new_thread_event) |
c906108c SS |
1701 | { |
1702 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
cd0fc7c3 | 1703 | goto wfi_continue; |
c906108c SS |
1704 | } |
1705 | ||
cd0fc7c3 | 1706 | stop_pc = read_pc_pid (ecs->pid); |
c906108c SS |
1707 | |
1708 | /* See if a thread hit a thread-specific breakpoint that was meant for | |
1709 | another thread. If so, then step that thread past the breakpoint, | |
1710 | and continue it. */ | |
1711 | ||
1712 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1713 | { | |
1714 | if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) | |
cd0fc7c3 | 1715 | ecs->random_signal = 0; |
c906108c SS |
1716 | else if (breakpoints_inserted |
1717 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
1718 | { | |
cd0fc7c3 | 1719 | ecs->random_signal = 0; |
c906108c | 1720 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, |
cd0fc7c3 | 1721 | ecs->pid)) |
c906108c SS |
1722 | { |
1723 | int remove_status; | |
1724 | ||
1725 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1726 | Just continue. */ | |
cd0fc7c3 | 1727 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->pid); |
c906108c SS |
1728 | |
1729 | remove_status = remove_breakpoints (); | |
1730 | /* Did we fail to remove breakpoints? If so, try | |
1731 | to set the PC past the bp. (There's at least | |
1732 | one situation in which we can fail to remove | |
1733 | the bp's: On HP-UX's that use ttrace, we can't | |
1734 | change the address space of a vforking child | |
1735 | process until the child exits (well, okay, not | |
1736 | then either :-) or execs. */ | |
1737 | if (remove_status != 0) | |
1738 | { | |
cd0fc7c3 | 1739 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->pid); |
c906108c SS |
1740 | } |
1741 | else | |
1742 | { /* Single step */ | |
cd0fc7c3 | 1743 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); |
c906108c SS |
1744 | /* FIXME: What if a signal arrives instead of the |
1745 | single-step happening? */ | |
1746 | ||
cd0fc7c3 SS |
1747 | ecs->waiton_pid = ecs->pid; |
1748 | ecs->wp = &(ecs->ws); | |
1749 | ecs->infwait_state = infwait_thread_hop_state; | |
1750 | goto wfi_continue; | |
c906108c SS |
1751 | } |
1752 | ||
7a292a7a SS |
1753 | /* We need to restart all the threads now, |
1754 | * unles we're running in scheduler-locked mode. | |
cd0fc7c3 | 1755 | * FIXME: shouldn't we look at currently_stepping ()? |
7a292a7a SS |
1756 | */ |
1757 | if (scheduler_mode == schedlock_on) | |
cd0fc7c3 | 1758 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); |
7a292a7a SS |
1759 | else |
1760 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
cd0fc7c3 | 1761 | goto wfi_continue; |
c906108c SS |
1762 | } |
1763 | else | |
1764 | { | |
1765 | /* This breakpoint matches--either it is the right | |
1766 | thread or it's a generic breakpoint for all threads. | |
1767 | Remember that we'll need to step just _this_ thread | |
1768 | on any following user continuation! */ | |
1769 | thread_step_needed = 1; | |
1770 | } | |
1771 | } | |
1772 | } | |
1773 | else | |
cd0fc7c3 | 1774 | ecs->random_signal = 1; |
c906108c SS |
1775 | |
1776 | /* See if something interesting happened to the non-current thread. If | |
1777 | so, then switch to that thread, and eventually give control back to | |
1778 | the user. | |
1779 | ||
1780 | Note that if there's any kind of pending follow (i.e., of a fork, | |
1781 | vfork or exec), we don't want to do this now. Rather, we'll let | |
1782 | the next resume handle it. */ | |
cd0fc7c3 | 1783 | if ((ecs->pid != inferior_pid) && |
c906108c SS |
1784 | (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) |
1785 | { | |
1786 | int printed = 0; | |
1787 | ||
1788 | /* If it's a random signal for a non-current thread, notify user | |
1789 | if he's expressed an interest. */ | |
cd0fc7c3 | 1790 | if (ecs->random_signal |
c906108c SS |
1791 | && signal_print[stop_signal]) |
1792 | { | |
1793 | /* ??rehrauer: I don't understand the rationale for this code. If the | |
1794 | inferior will stop as a result of this signal, then the act of handling | |
1795 | the stop ought to print a message that's couches the stoppage in user | |
1796 | terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior | |
1797 | won't stop as a result of the signal -- i.e., if the signal is merely | |
1798 | a side-effect of something GDB's doing "under the covers" for the | |
1799 | user, such as stepping threads over a breakpoint they shouldn't stop | |
1800 | for -- then the message seems to be a serious annoyance at best. | |
1801 | ||
1802 | For now, remove the message altogether. */ | |
1803 | #if 0 | |
1804 | printed = 1; | |
1805 | target_terminal_ours_for_output (); | |
1806 | printf_filtered ("\nProgram received signal %s, %s.\n", | |
1807 | target_signal_to_name (stop_signal), | |
1808 | target_signal_to_string (stop_signal)); | |
1809 | gdb_flush (gdb_stdout); | |
1810 | #endif | |
1811 | } | |
1812 | ||
1813 | /* If it's not SIGTRAP and not a signal we want to stop for, then | |
1814 | continue the thread. */ | |
1815 | ||
1816 | if (stop_signal != TARGET_SIGNAL_TRAP | |
1817 | && !signal_stop[stop_signal]) | |
1818 | { | |
1819 | if (printed) | |
1820 | target_terminal_inferior (); | |
1821 | ||
1822 | /* Clear the signal if it should not be passed. */ | |
1823 | if (signal_program[stop_signal] == 0) | |
1824 | stop_signal = TARGET_SIGNAL_0; | |
1825 | ||
cd0fc7c3 SS |
1826 | target_resume (ecs->pid, 0, stop_signal); |
1827 | goto wfi_continue; | |
c906108c SS |
1828 | } |
1829 | ||
1830 | /* It's a SIGTRAP or a signal we're interested in. Switch threads, | |
1831 | and fall into the rest of wait_for_inferior(). */ | |
1832 | ||
1833 | /* Save infrun state for the old thread. */ | |
1834 | save_infrun_state (inferior_pid, prev_pc, | |
1835 | prev_func_start, prev_func_name, | |
1836 | trap_expected, step_resume_breakpoint, | |
1837 | through_sigtramp_breakpoint, | |
1838 | step_range_start, step_range_end, | |
cd0fc7c3 SS |
1839 | step_frame_address, ecs->handling_longjmp, |
1840 | ecs->another_trap, | |
1841 | ecs->stepping_through_solib_after_catch, | |
1842 | ecs->stepping_through_solib_catchpoints, | |
1843 | ecs->stepping_through_sigtramp); | |
c906108c | 1844 | |
7a292a7a SS |
1845 | if (may_switch_from_inferior_pid) |
1846 | switched_from_inferior_pid = inferior_pid; | |
c906108c | 1847 | |
cd0fc7c3 | 1848 | inferior_pid = ecs->pid; |
c906108c SS |
1849 | |
1850 | /* Load infrun state for the new thread. */ | |
1851 | load_infrun_state (inferior_pid, &prev_pc, | |
1852 | &prev_func_start, &prev_func_name, | |
1853 | &trap_expected, &step_resume_breakpoint, | |
1854 | &through_sigtramp_breakpoint, | |
1855 | &step_range_start, &step_range_end, | |
cd0fc7c3 SS |
1856 | &step_frame_address, &ecs->handling_longjmp, |
1857 | &ecs->another_trap, | |
1858 | &ecs->stepping_through_solib_after_catch, | |
1859 | &ecs->stepping_through_solib_catchpoints, | |
1860 | &ecs->stepping_through_sigtramp); | |
c906108c SS |
1861 | |
1862 | if (context_hook) | |
cd0fc7c3 | 1863 | context_hook (pid_to_thread_id (ecs->pid)); |
c906108c | 1864 | |
cd0fc7c3 | 1865 | printf_filtered ("[Switching to %s]\n", target_pid_to_str (ecs->pid)); |
c906108c SS |
1866 | flush_cached_frames (); |
1867 | } | |
1868 | ||
1869 | if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) | |
1870 | { | |
1871 | /* Pull the single step breakpoints out of the target. */ | |
1872 | SOFTWARE_SINGLE_STEP (0, 0); | |
1873 | singlestep_breakpoints_inserted_p = 0; | |
1874 | } | |
1875 | ||
1876 | /* If PC is pointing at a nullified instruction, then step beyond | |
1877 | it so that the user won't be confused when GDB appears to be ready | |
1878 | to execute it. */ | |
1879 | ||
cd0fc7c3 | 1880 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
c906108c SS |
1881 | if (INSTRUCTION_NULLIFIED) |
1882 | { | |
c906108c | 1883 | registers_changed (); |
cd0fc7c3 | 1884 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); |
c906108c SS |
1885 | |
1886 | /* We may have received a signal that we want to pass to | |
1887 | the inferior; therefore, we must not clobber the waitstatus | |
cd0fc7c3 | 1888 | in WS. */ |
c906108c | 1889 | |
cd0fc7c3 SS |
1890 | ecs->infwait_state = infwait_nullified_state; |
1891 | ecs->waiton_pid = ecs->pid; | |
1892 | ecs->wp = &(ecs->tmpstatus); | |
1893 | goto wfi_continue; | |
c906108c SS |
1894 | } |
1895 | ||
c906108c SS |
1896 | /* It may not be necessary to disable the watchpoint to stop over |
1897 | it. For example, the PA can (with some kernel cooperation) | |
1898 | single step over a watchpoint without disabling the watchpoint. */ | |
cd0fc7c3 | 1899 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) |
c906108c SS |
1900 | { |
1901 | resume (1, 0); | |
cd0fc7c3 | 1902 | goto wfi_continue; |
c906108c | 1903 | } |
c906108c | 1904 | |
7a292a7a SS |
1905 | /* It is far more common to need to disable a watchpoint to step |
1906 | the inferior over it. FIXME. What else might a debug | |
1907 | register or page protection watchpoint scheme need here? */ | |
cd0fc7c3 | 1908 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) |
c906108c | 1909 | { |
7a292a7a SS |
1910 | /* At this point, we are stopped at an instruction which has |
1911 | attempted to write to a piece of memory under control of | |
1912 | a watchpoint. The instruction hasn't actually executed | |
1913 | yet. If we were to evaluate the watchpoint expression | |
1914 | now, we would get the old value, and therefore no change | |
1915 | would seem to have occurred. | |
1916 | ||
1917 | In order to make watchpoints work `right', we really need | |
1918 | to complete the memory write, and then evaluate the | |
1919 | watchpoint expression. The following code does that by | |
1920 | removing the watchpoint (actually, all watchpoints and | |
1921 | breakpoints), single-stepping the target, re-inserting | |
1922 | watchpoints, and then falling through to let normal | |
1923 | single-step processing handle proceed. Since this | |
1924 | includes evaluating watchpoints, things will come to a | |
1925 | stop in the correct manner. */ | |
c906108c SS |
1926 | |
1927 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
1928 | ||
1929 | remove_breakpoints (); | |
1930 | registers_changed (); | |
cd0fc7c3 | 1931 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); /* Single step */ |
c906108c | 1932 | |
cd0fc7c3 SS |
1933 | ecs->waiton_pid = ecs->pid; |
1934 | ecs->wp = &(ecs->ws); | |
1935 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1936 | goto wfi_continue; | |
c906108c | 1937 | } |
c906108c | 1938 | |
c906108c | 1939 | /* It may be possible to simply continue after a watchpoint. */ |
7a292a7a | 1940 | if (HAVE_CONTINUABLE_WATCHPOINT) |
cd0fc7c3 | 1941 | STOPPED_BY_WATCHPOINT (ecs->ws); |
c906108c | 1942 | |
cd0fc7c3 SS |
1943 | ecs->stop_func_start = 0; |
1944 | ecs->stop_func_end = 0; | |
1945 | ecs->stop_func_name = 0; | |
c906108c SS |
1946 | /* Don't care about return value; stop_func_start and stop_func_name |
1947 | will both be 0 if it doesn't work. */ | |
cd0fc7c3 SS |
1948 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, |
1949 | &ecs->stop_func_start, &ecs->stop_func_end); | |
1950 | ecs->stop_func_start += FUNCTION_START_OFFSET; | |
1951 | ecs->another_trap = 0; | |
c906108c SS |
1952 | bpstat_clear (&stop_bpstat); |
1953 | stop_step = 0; | |
1954 | stop_stack_dummy = 0; | |
1955 | stop_print_frame = 1; | |
cd0fc7c3 | 1956 | ecs->random_signal = 0; |
c906108c SS |
1957 | stopped_by_random_signal = 0; |
1958 | breakpoints_failed = 0; | |
1959 | ||
1960 | /* Look at the cause of the stop, and decide what to do. | |
1961 | The alternatives are: | |
1962 | 1) break; to really stop and return to the debugger, | |
1963 | 2) drop through to start up again | |
cd0fc7c3 SS |
1964 | (set ecs->another_trap to 1 to single step once) |
1965 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
c906108c SS |
1966 | will be made according to the signal handling tables. */ |
1967 | ||
1968 | /* First, distinguish signals caused by the debugger from signals | |
1969 | that have to do with the program's own actions. | |
1970 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
1971 | or SIGEMT, depending on the operating system version. | |
1972 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
1973 | and change it to SIGTRAP. */ | |
1974 | ||
1975 | if (stop_signal == TARGET_SIGNAL_TRAP | |
1976 | || (breakpoints_inserted && | |
1977 | (stop_signal == TARGET_SIGNAL_ILL | |
1978 | || stop_signal == TARGET_SIGNAL_EMT | |
1979 | )) | |
1980 | || stop_soon_quietly) | |
1981 | { | |
1982 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1983 | { | |
1984 | stop_print_frame = 0; | |
cd0fc7c3 | 1985 | goto wfi_break; |
c906108c SS |
1986 | } |
1987 | if (stop_soon_quietly) | |
cd0fc7c3 | 1988 | goto wfi_break; |
c906108c SS |
1989 | |
1990 | /* Don't even think about breakpoints | |
1991 | if just proceeded over a breakpoint. | |
1992 | ||
1993 | However, if we are trying to proceed over a breakpoint | |
1994 | and end up in sigtramp, then through_sigtramp_breakpoint | |
1995 | will be set and we should check whether we've hit the | |
1996 | step breakpoint. */ | |
1997 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected | |
1998 | && through_sigtramp_breakpoint == NULL) | |
1999 | bpstat_clear (&stop_bpstat); | |
2000 | else | |
2001 | { | |
2002 | /* See if there is a breakpoint at the current PC. */ | |
2003 | stop_bpstat = bpstat_stop_status | |
2004 | (&stop_pc, | |
2005 | (DECR_PC_AFTER_BREAK ? | |
2006 | /* Notice the case of stepping through a jump | |
2007 | that lands just after a breakpoint. | |
2008 | Don't confuse that with hitting the breakpoint. | |
2009 | What we check for is that 1) stepping is going on | |
2010 | and 2) the pc before the last insn does not match | |
2011 | the address of the breakpoint before the current pc | |
2012 | and 3) we didn't hit a breakpoint in a signal handler | |
2013 | without an intervening stop in sigtramp, which is | |
2014 | detected by a new stack pointer value below | |
2015 | any usual function calling stack adjustments. */ | |
cd0fc7c3 | 2016 | (currently_stepping (ecs) |
c906108c SS |
2017 | && prev_pc != stop_pc - DECR_PC_AFTER_BREAK |
2018 | && !(step_range_end | |
2019 | && INNER_THAN (read_sp (), (step_sp - 16)))) : | |
2020 | 0) | |
2021 | ); | |
2022 | /* Following in case break condition called a | |
2023 | function. */ | |
2024 | stop_print_frame = 1; | |
2025 | } | |
2026 | ||
2027 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
cd0fc7c3 | 2028 | ecs->random_signal |
c906108c SS |
2029 | = !(bpstat_explains_signal (stop_bpstat) |
2030 | || trap_expected | |
7a292a7a SS |
2031 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P |
2032 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2033 | FRAME_FP (get_current_frame ()))) | |
c906108c SS |
2034 | || (step_range_end && step_resume_breakpoint == NULL)); |
2035 | ||
2036 | else | |
2037 | { | |
cd0fc7c3 | 2038 | ecs->random_signal |
c906108c | 2039 | = !(bpstat_explains_signal (stop_bpstat) |
7a292a7a SS |
2040 | /* End of a stack dummy. Some systems (e.g. Sony |
2041 | news) give another signal besides SIGTRAP, so | |
2042 | check here as well as above. */ | |
2043 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P | |
2044 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2045 | FRAME_FP (get_current_frame ()))) | |
c906108c | 2046 | ); |
cd0fc7c3 | 2047 | if (!ecs->random_signal) |
c906108c SS |
2048 | stop_signal = TARGET_SIGNAL_TRAP; |
2049 | } | |
2050 | } | |
2051 | ||
2052 | /* When we reach this point, we've pretty much decided | |
2053 | that the reason for stopping must've been a random | |
2054 | (unexpected) signal. */ | |
2055 | ||
2056 | else | |
cd0fc7c3 | 2057 | ecs->random_signal = 1; |
c906108c SS |
2058 | /* If a fork, vfork or exec event was seen, then there are two |
2059 | possible responses we can make: | |
2060 | ||
cd0fc7c3 | 2061 | 1. If a catchpoint triggers for the event (ecs->random_signal == 0), |
c906108c SS |
2062 | then we must stop now and issue a prompt. We will resume |
2063 | the inferior when the user tells us to. | |
cd0fc7c3 | 2064 | 2. If no catchpoint triggers for the event (ecs->random_signal == 1), |
c906108c SS |
2065 | then we must resume the inferior now and keep checking. |
2066 | ||
2067 | In either case, we must take appropriate steps to "follow" the | |
2068 | the fork/vfork/exec when the inferior is resumed. For example, | |
2069 | if follow-fork-mode is "child", then we must detach from the | |
2070 | parent inferior and follow the new child inferior. | |
2071 | ||
2072 | In either case, setting pending_follow causes the next resume() | |
2073 | to take the appropriate following action. */ | |
2074 | process_event_stop_test: | |
cd0fc7c3 | 2075 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
c906108c | 2076 | { |
cd0fc7c3 | 2077 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ |
c906108c SS |
2078 | { |
2079 | trap_expected = 1; | |
2080 | stop_signal = TARGET_SIGNAL_0; | |
2081 | goto keep_going; | |
2082 | } | |
2083 | } | |
cd0fc7c3 | 2084 | else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED) |
c906108c | 2085 | { |
cd0fc7c3 | 2086 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ |
c906108c SS |
2087 | { |
2088 | stop_signal = TARGET_SIGNAL_0; | |
2089 | goto keep_going; | |
2090 | } | |
2091 | } | |
cd0fc7c3 | 2092 | else if (ecs->ws.kind == TARGET_WAITKIND_EXECD) |
c906108c | 2093 | { |
cd0fc7c3 SS |
2094 | pending_follow.kind = ecs->ws.kind; |
2095 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
c906108c SS |
2096 | { |
2097 | trap_expected = 1; | |
2098 | stop_signal = TARGET_SIGNAL_0; | |
2099 | goto keep_going; | |
2100 | } | |
2101 | } | |
2102 | ||
2103 | /* For the program's own signals, act according to | |
2104 | the signal handling tables. */ | |
2105 | ||
cd0fc7c3 | 2106 | if (ecs->random_signal) |
c906108c SS |
2107 | { |
2108 | /* Signal not for debugging purposes. */ | |
2109 | int printed = 0; | |
2110 | ||
2111 | stopped_by_random_signal = 1; | |
2112 | ||
2113 | if (signal_print[stop_signal]) | |
2114 | { | |
2115 | printed = 1; | |
2116 | target_terminal_ours_for_output (); | |
2117 | annotate_signal (); | |
2118 | printf_filtered ("\nProgram received signal "); | |
2119 | annotate_signal_name (); | |
2120 | printf_filtered ("%s", target_signal_to_name (stop_signal)); | |
2121 | annotate_signal_name_end (); | |
2122 | printf_filtered (", "); | |
2123 | annotate_signal_string (); | |
2124 | printf_filtered ("%s", target_signal_to_string (stop_signal)); | |
2125 | annotate_signal_string_end (); | |
2126 | printf_filtered (".\n"); | |
2127 | gdb_flush (gdb_stdout); | |
2128 | } | |
2129 | if (signal_stop[stop_signal]) | |
cd0fc7c3 | 2130 | goto wfi_break; |
c906108c SS |
2131 | /* If not going to stop, give terminal back |
2132 | if we took it away. */ | |
2133 | else if (printed) | |
2134 | target_terminal_inferior (); | |
2135 | ||
2136 | /* Clear the signal if it should not be passed. */ | |
2137 | if (signal_program[stop_signal] == 0) | |
2138 | stop_signal = TARGET_SIGNAL_0; | |
2139 | ||
2140 | /* If we're in the middle of a "next" command, let the code for | |
2141 | stepping over a function handle this. pai/1997-09-10 | |
2142 | ||
2143 | A previous comment here suggested it was possible to change | |
2144 | this to jump to keep_going in all cases. */ | |
2145 | ||
2146 | if (step_over_calls > 0) | |
2147 | goto step_over_function; | |
2148 | else | |
2149 | goto check_sigtramp2; | |
2150 | } | |
2151 | ||
2152 | /* Handle cases caused by hitting a breakpoint. */ | |
2153 | { | |
2154 | CORE_ADDR jmp_buf_pc; | |
2155 | struct bpstat_what what; | |
2156 | ||
2157 | what = bpstat_what (stop_bpstat); | |
2158 | ||
2159 | if (what.call_dummy) | |
2160 | { | |
2161 | stop_stack_dummy = 1; | |
2162 | #ifdef HP_OS_BUG | |
2163 | trap_expected_after_continue = 1; | |
2164 | #endif | |
2165 | } | |
2166 | ||
2167 | switch (what.main_action) | |
2168 | { | |
2169 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
2170 | /* If we hit the breakpoint at longjmp, disable it for the | |
2171 | duration of this command. Then, install a temporary | |
2172 | breakpoint at the target of the jmp_buf. */ | |
2173 | disable_longjmp_breakpoint (); | |
2174 | remove_breakpoints (); | |
2175 | breakpoints_inserted = 0; | |
2176 | if (!GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
2177 | goto keep_going; | |
2178 | ||
2179 | /* Need to blow away step-resume breakpoint, as it | |
2180 | interferes with us */ | |
2181 | if (step_resume_breakpoint != NULL) | |
2182 | { | |
2183 | delete_breakpoint (step_resume_breakpoint); | |
2184 | step_resume_breakpoint = NULL; | |
2185 | } | |
2186 | /* Not sure whether we need to blow this away too, but probably | |
2187 | it is like the step-resume breakpoint. */ | |
2188 | if (through_sigtramp_breakpoint != NULL) | |
2189 | { | |
2190 | delete_breakpoint (through_sigtramp_breakpoint); | |
2191 | through_sigtramp_breakpoint = NULL; | |
2192 | } | |
2193 | ||
2194 | #if 0 | |
2195 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2196 | if (step_over_calls > 0) | |
2197 | set_longjmp_resume_breakpoint (jmp_buf_pc, | |
2198 | get_current_frame ()); | |
2199 | else | |
2200 | #endif /* 0 */ | |
2201 | set_longjmp_resume_breakpoint (jmp_buf_pc, NULL); | |
cd0fc7c3 | 2202 | ecs->handling_longjmp = 1; /* FIXME */ |
c906108c SS |
2203 | goto keep_going; |
2204 | ||
2205 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: | |
2206 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
2207 | remove_breakpoints (); | |
2208 | breakpoints_inserted = 0; | |
2209 | #if 0 | |
2210 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2211 | if (step_over_calls | |
2212 | && (INNER_THAN (FRAME_FP (get_current_frame ()), | |
2213 | step_frame_address))) | |
2214 | { | |
cd0fc7c3 | 2215 | ecs->another_trap = 1; |
c906108c SS |
2216 | goto keep_going; |
2217 | } | |
2218 | #endif /* 0 */ | |
2219 | disable_longjmp_breakpoint (); | |
cd0fc7c3 | 2220 | ecs->handling_longjmp = 0; /* FIXME */ |
c906108c SS |
2221 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) |
2222 | break; | |
2223 | /* else fallthrough */ | |
2224 | ||
2225 | case BPSTAT_WHAT_SINGLE: | |
2226 | if (breakpoints_inserted) | |
2227 | { | |
2228 | thread_step_needed = 1; | |
2229 | remove_breakpoints (); | |
2230 | } | |
2231 | breakpoints_inserted = 0; | |
cd0fc7c3 | 2232 | ecs->another_trap = 1; |
c906108c SS |
2233 | /* Still need to check other stuff, at least the case |
2234 | where we are stepping and step out of the right range. */ | |
2235 | break; | |
2236 | ||
2237 | case BPSTAT_WHAT_STOP_NOISY: | |
2238 | stop_print_frame = 1; | |
2239 | ||
2240 | /* We are about to nuke the step_resume_breakpoint and | |
2241 | through_sigtramp_breakpoint via the cleanup chain, so | |
2242 | no need to worry about it here. */ | |
2243 | ||
2244 | goto stop_stepping; | |
2245 | ||
2246 | case BPSTAT_WHAT_STOP_SILENT: | |
2247 | stop_print_frame = 0; | |
2248 | ||
2249 | /* We are about to nuke the step_resume_breakpoint and | |
2250 | through_sigtramp_breakpoint via the cleanup chain, so | |
2251 | no need to worry about it here. */ | |
2252 | ||
2253 | goto stop_stepping; | |
2254 | ||
2255 | case BPSTAT_WHAT_STEP_RESUME: | |
2256 | /* This proably demands a more elegant solution, but, yeah | |
2257 | right... | |
2258 | ||
2259 | This function's use of the simple variable | |
2260 | step_resume_breakpoint doesn't seem to accomodate | |
2261 | simultaneously active step-resume bp's, although the | |
2262 | breakpoint list certainly can. | |
2263 | ||
2264 | If we reach here and step_resume_breakpoint is already | |
2265 | NULL, then apparently we have multiple active | |
2266 | step-resume bp's. We'll just delete the breakpoint we | |
2267 | stopped at, and carry on. */ | |
2268 | if (step_resume_breakpoint == NULL) | |
2269 | { | |
2270 | step_resume_breakpoint = | |
2271 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2272 | } | |
2273 | delete_breakpoint (step_resume_breakpoint); | |
2274 | step_resume_breakpoint = NULL; | |
2275 | break; | |
2276 | ||
2277 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
2278 | if (through_sigtramp_breakpoint) | |
2279 | delete_breakpoint (through_sigtramp_breakpoint); | |
2280 | through_sigtramp_breakpoint = NULL; | |
2281 | ||
2282 | /* If were waiting for a trap, hitting the step_resume_break | |
2283 | doesn't count as getting it. */ | |
2284 | if (trap_expected) | |
cd0fc7c3 | 2285 | ecs->another_trap = 1; |
c906108c SS |
2286 | break; |
2287 | ||
2288 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2289 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2290 | #ifdef SOLIB_ADD | |
2291 | { | |
c906108c SS |
2292 | /* Remove breakpoints, we eventually want to step over the |
2293 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2294 | breakpoint addresses via breakpoint_re_set. */ | |
2295 | if (breakpoints_inserted) | |
2296 | remove_breakpoints (); | |
2297 | breakpoints_inserted = 0; | |
2298 | ||
2299 | /* Check for any newly added shared libraries if we're | |
2300 | supposed to be adding them automatically. */ | |
2301 | if (auto_solib_add) | |
2302 | { | |
2303 | /* Switch terminal for any messages produced by | |
2304 | breakpoint_re_set. */ | |
2305 | target_terminal_ours_for_output (); | |
2306 | SOLIB_ADD (NULL, 0, NULL); | |
2307 | target_terminal_inferior (); | |
2308 | } | |
2309 | ||
2310 | /* Try to reenable shared library breakpoints, additional | |
2311 | code segments in shared libraries might be mapped in now. */ | |
2312 | re_enable_breakpoints_in_shlibs (); | |
2313 | ||
2314 | /* If requested, stop when the dynamic linker notifies | |
2315 | gdb of events. This allows the user to get control | |
2316 | and place breakpoints in initializer routines for | |
2317 | dynamically loaded objects (among other things). */ | |
2318 | if (stop_on_solib_events) | |
2319 | { | |
2320 | stop_print_frame = 0; | |
2321 | goto stop_stepping; | |
2322 | } | |
2323 | ||
2324 | /* If we stopped due to an explicit catchpoint, then the | |
2325 | (see above) call to SOLIB_ADD pulled in any symbols | |
2326 | from a newly-loaded library, if appropriate. | |
2327 | ||
2328 | We do want the inferior to stop, but not where it is | |
2329 | now, which is in the dynamic linker callback. Rather, | |
2330 | we would like it stop in the user's program, just after | |
2331 | the call that caused this catchpoint to trigger. That | |
2332 | gives the user a more useful vantage from which to | |
2333 | examine their program's state. */ | |
2334 | else if (what.main_action == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
2335 | { | |
2336 | /* ??rehrauer: If I could figure out how to get the | |
2337 | right return PC from here, we could just set a temp | |
2338 | breakpoint and resume. I'm not sure we can without | |
2339 | cracking open the dld's shared libraries and sniffing | |
2340 | their unwind tables and text/data ranges, and that's | |
2341 | not a terribly portable notion. | |
2342 | ||
2343 | Until that time, we must step the inferior out of the | |
2344 | dld callback, and also out of the dld itself (and any | |
2345 | code or stubs in libdld.sl, such as "shl_load" and | |
2346 | friends) until we reach non-dld code. At that point, | |
2347 | we can stop stepping. */ | |
2348 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
cd0fc7c3 SS |
2349 | &ecs->stepping_through_solib_catchpoints); |
2350 | ecs->stepping_through_solib_after_catch = 1; | |
c906108c SS |
2351 | |
2352 | /* Be sure to lift all breakpoints, so the inferior does | |
2353 | actually step past this point... */ | |
cd0fc7c3 | 2354 | ecs->another_trap = 1; |
c906108c SS |
2355 | break; |
2356 | } | |
2357 | else | |
2358 | { | |
2359 | /* We want to step over this breakpoint, then keep going. */ | |
cd0fc7c3 | 2360 | ecs->another_trap = 1; |
c906108c SS |
2361 | break; |
2362 | } | |
2363 | } | |
2364 | #endif | |
2365 | break; | |
2366 | ||
2367 | case BPSTAT_WHAT_LAST: | |
2368 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
2369 | ||
2370 | case BPSTAT_WHAT_KEEP_CHECKING: | |
2371 | break; | |
2372 | } | |
2373 | } | |
2374 | ||
2375 | /* We come here if we hit a breakpoint but should not | |
2376 | stop for it. Possibly we also were stepping | |
2377 | and should stop for that. So fall through and | |
2378 | test for stepping. But, if not stepping, | |
2379 | do not stop. */ | |
2380 | ||
2381 | /* Are we stepping to get the inferior out of the dynamic | |
2382 | linker's hook (and possibly the dld itself) after catching | |
2383 | a shlib event? */ | |
cd0fc7c3 | 2384 | if (ecs->stepping_through_solib_after_catch) |
c906108c SS |
2385 | { |
2386 | #if defined(SOLIB_ADD) | |
2387 | /* Have we reached our destination? If not, keep going. */ | |
cd0fc7c3 | 2388 | if (SOLIB_IN_DYNAMIC_LINKER (ecs->pid, stop_pc)) |
c906108c | 2389 | { |
cd0fc7c3 | 2390 | ecs->another_trap = 1; |
c906108c SS |
2391 | goto keep_going; |
2392 | } | |
2393 | #endif | |
2394 | /* Else, stop and report the catchpoint(s) whose triggering | |
2395 | caused us to begin stepping. */ | |
cd0fc7c3 | 2396 | ecs->stepping_through_solib_after_catch = 0; |
c906108c | 2397 | bpstat_clear (&stop_bpstat); |
cd0fc7c3 SS |
2398 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); |
2399 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
c906108c SS |
2400 | stop_print_frame = 1; |
2401 | goto stop_stepping; | |
2402 | } | |
2403 | ||
7a292a7a | 2404 | if (!CALL_DUMMY_BREAKPOINT_OFFSET_P) |
c906108c | 2405 | { |
7a292a7a SS |
2406 | /* This is the old way of detecting the end of the stack dummy. |
2407 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
2408 | handled above. As soon as we can test it on all of them, all | |
2409 | architectures should define it. */ | |
2410 | ||
2411 | /* If this is the breakpoint at the end of a stack dummy, | |
2412 | just stop silently, unless the user was doing an si/ni, in which | |
2413 | case she'd better know what she's doing. */ | |
2414 | ||
2415 | if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (), | |
2416 | FRAME_FP (get_current_frame ())) | |
2417 | && !step_range_end) | |
2418 | { | |
2419 | stop_print_frame = 0; | |
2420 | stop_stack_dummy = 1; | |
c906108c | 2421 | #ifdef HP_OS_BUG |
7a292a7a | 2422 | trap_expected_after_continue = 1; |
c906108c | 2423 | #endif |
cd0fc7c3 | 2424 | goto wfi_break; |
7a292a7a | 2425 | } |
c906108c | 2426 | } |
7a292a7a | 2427 | |
c906108c SS |
2428 | if (step_resume_breakpoint) |
2429 | /* Having a step-resume breakpoint overrides anything | |
2430 | else having to do with stepping commands until | |
2431 | that breakpoint is reached. */ | |
2432 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2433 | whether it could/should be keep_going. */ | |
2434 | goto check_sigtramp2; | |
7a292a7a | 2435 | |
c906108c SS |
2436 | if (step_range_end == 0) |
2437 | /* Likewise if we aren't even stepping. */ | |
2438 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2439 | whether it could/should be keep_going. */ | |
2440 | goto check_sigtramp2; | |
7a292a7a | 2441 | |
c906108c | 2442 | /* If stepping through a line, keep going if still within it. |
7a292a7a | 2443 | |
c906108c SS |
2444 | Note that step_range_end is the address of the first instruction |
2445 | beyond the step range, and NOT the address of the last instruction | |
2446 | within it! */ | |
2447 | if (stop_pc >= step_range_start | |
7a292a7a | 2448 | && stop_pc < step_range_end) |
c906108c SS |
2449 | { |
2450 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. | |
2451 | So definately need to check for sigtramp here. */ | |
2452 | goto check_sigtramp2; | |
2453 | } | |
2454 | ||
2455 | /* We stepped out of the stepping range. */ | |
2456 | ||
2457 | /* If we are stepping at the source level and entered the runtime | |
2458 | loader dynamic symbol resolution code, we keep on single stepping | |
2459 | until we exit the run time loader code and reach the callee's | |
2460 | address. */ | |
2461 | if (step_over_calls < 0 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2462 | goto keep_going; | |
2463 | ||
2464 | /* We can't update step_sp every time through the loop, because | |
2465 | reading the stack pointer would slow down stepping too much. | |
2466 | But we can update it every time we leave the step range. */ | |
cd0fc7c3 | 2467 | ecs->update_step_sp = 1; |
c906108c SS |
2468 | |
2469 | /* Did we just take a signal? */ | |
cd0fc7c3 | 2470 | if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name) |
c906108c SS |
2471 | && !IN_SIGTRAMP (prev_pc, prev_func_name) |
2472 | && INNER_THAN (read_sp (), step_sp)) | |
2473 | { | |
2474 | /* We've just taken a signal; go until we are back to | |
2475 | the point where we took it and one more. */ | |
2476 | ||
2477 | /* Note: The test above succeeds not only when we stepped | |
2478 | into a signal handler, but also when we step past the last | |
2479 | statement of a signal handler and end up in the return stub | |
2480 | of the signal handler trampoline. To distinguish between | |
2481 | these two cases, check that the frame is INNER_THAN the | |
2482 | previous one below. pai/1997-09-11 */ | |
2483 | ||
2484 | ||
2485 | { | |
2486 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
2487 | ||
2488 | if (INNER_THAN (current_frame, step_frame_address)) | |
2489 | { | |
2490 | /* We have just taken a signal; go until we are back to | |
2491 | the point where we took it and one more. */ | |
2492 | ||
2493 | /* This code is needed at least in the following case: | |
2494 | The user types "next" and then a signal arrives (before | |
2495 | the "next" is done). */ | |
2496 | ||
2497 | /* Note that if we are stopped at a breakpoint, then we need | |
2498 | the step_resume breakpoint to override any breakpoints at | |
2499 | the same location, so that we will still step over the | |
2500 | breakpoint even though the signal happened. */ | |
2501 | struct symtab_and_line sr_sal; | |
2502 | ||
2503 | INIT_SAL (&sr_sal); | |
2504 | sr_sal.symtab = NULL; | |
2505 | sr_sal.line = 0; | |
2506 | sr_sal.pc = prev_pc; | |
2507 | /* We could probably be setting the frame to | |
2508 | step_frame_address; I don't think anyone thought to | |
2509 | try it. */ | |
2510 | step_resume_breakpoint = | |
2511 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2512 | if (breakpoints_inserted) | |
2513 | insert_breakpoints (); | |
2514 | } | |
2515 | else | |
2516 | { | |
2517 | /* We just stepped out of a signal handler and into | |
2518 | its calling trampoline. | |
2519 | ||
2520 | Normally, we'd jump to step_over_function from | |
2521 | here, but for some reason GDB can't unwind the | |
2522 | stack correctly to find the real PC for the point | |
2523 | user code where the signal trampoline will return | |
2524 | -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. | |
2525 | But signal trampolines are pretty small stubs of | |
2526 | code, anyway, so it's OK instead to just | |
2527 | single-step out. Note: assuming such trampolines | |
2528 | don't exhibit recursion on any platform... */ | |
cd0fc7c3 SS |
2529 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, |
2530 | &ecs->stop_func_start, | |
2531 | &ecs->stop_func_end); | |
c906108c | 2532 | /* Readjust stepping range */ |
cd0fc7c3 SS |
2533 | step_range_start = ecs->stop_func_start; |
2534 | step_range_end = ecs->stop_func_end; | |
2535 | ecs->stepping_through_sigtramp = 1; | |
c906108c SS |
2536 | } |
2537 | } | |
2538 | ||
2539 | ||
2540 | /* If this is stepi or nexti, make sure that the stepping range | |
2541 | gets us past that instruction. */ | |
2542 | if (step_range_end == 1) | |
2543 | /* FIXME: Does this run afoul of the code below which, if | |
2544 | we step into the middle of a line, resets the stepping | |
2545 | range? */ | |
2546 | step_range_end = (step_range_start = prev_pc) + 1; | |
2547 | ||
cd0fc7c3 | 2548 | ecs->remove_breakpoints_on_following_step = 1; |
c906108c SS |
2549 | goto keep_going; |
2550 | } | |
2551 | ||
cd0fc7c3 SS |
2552 | if (stop_pc == ecs->stop_func_start /* Quick test */ |
2553 | || (in_prologue (stop_pc, ecs->stop_func_start) && | |
2554 | !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2555 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name) | |
2556 | || ecs->stop_func_name == 0) | |
c906108c SS |
2557 | { |
2558 | /* It's a subroutine call. */ | |
2559 | ||
2560 | if (step_over_calls == 0) | |
2561 | { | |
2562 | /* I presume that step_over_calls is only 0 when we're | |
2563 | supposed to be stepping at the assembly language level | |
2564 | ("stepi"). Just stop. */ | |
2565 | stop_step = 1; | |
cd0fc7c3 | 2566 | goto wfi_break; |
c906108c SS |
2567 | } |
2568 | ||
2569 | if (step_over_calls > 0 || IGNORE_HELPER_CALL (stop_pc)) | |
2570 | /* We're doing a "next". */ | |
2571 | goto step_over_function; | |
2572 | ||
2573 | /* If we are in a function call trampoline (a stub between | |
2574 | the calling routine and the real function), locate the real | |
2575 | function. That's what tells us (a) whether we want to step | |
2576 | into it at all, and (b) what prologue we want to run to | |
2577 | the end of, if we do step into it. */ | |
2578 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2579 | if (tmp != 0) | |
cd0fc7c3 | 2580 | ecs->stop_func_start = tmp; |
c906108c SS |
2581 | else |
2582 | { | |
2583 | tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); | |
2584 | if (tmp) | |
2585 | { | |
2586 | struct symtab_and_line xxx; | |
2587 | /* Why isn't this s_a_l called "sr_sal", like all of the | |
2588 | other s_a_l's where this code is duplicated? */ | |
2589 | INIT_SAL (&xxx); /* initialize to zeroes */ | |
2590 | xxx.pc = tmp; | |
2591 | xxx.section = find_pc_overlay (xxx.pc); | |
2592 | step_resume_breakpoint = | |
2593 | set_momentary_breakpoint (xxx, NULL, bp_step_resume); | |
2594 | insert_breakpoints (); | |
2595 | goto keep_going; | |
2596 | } | |
2597 | } | |
2598 | ||
2599 | /* If we have line number information for the function we | |
2600 | are thinking of stepping into, step into it. | |
2601 | ||
2602 | If there are several symtabs at that PC (e.g. with include | |
2603 | files), just want to know whether *any* of them have line | |
2604 | numbers. find_pc_line handles this. */ | |
2605 | { | |
2606 | struct symtab_and_line tmp_sal; | |
2607 | ||
cd0fc7c3 | 2608 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
c906108c SS |
2609 | if (tmp_sal.line != 0) |
2610 | goto step_into_function; | |
2611 | } | |
2612 | ||
2613 | step_over_function: | |
2614 | /* A subroutine call has happened. */ | |
2615 | { | |
2616 | /* Set a special breakpoint after the return */ | |
2617 | struct symtab_and_line sr_sal; | |
2618 | ||
2619 | INIT_SAL (&sr_sal); | |
2620 | sr_sal.symtab = NULL; | |
2621 | sr_sal.line = 0; | |
2622 | ||
2623 | /* If we came here after encountering a signal in the middle of | |
2624 | a "next", use the stashed-away previous frame pc */ | |
2625 | sr_sal.pc | |
2626 | = stopped_by_random_signal | |
2627 | ? prev_pc | |
2628 | : ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
2629 | ||
2630 | step_resume_breakpoint = | |
2631 | set_momentary_breakpoint (sr_sal, | |
2632 | stopped_by_random_signal ? | |
2633 | NULL : get_current_frame (), | |
2634 | bp_step_resume); | |
2635 | ||
2636 | /* We've just entered a callee, and we wish to resume until | |
2637 | it returns to the caller. Setting a step_resume bp on | |
2638 | the return PC will catch a return from the callee. | |
2639 | ||
2640 | However, if the callee is recursing, we want to be | |
2641 | careful not to catch returns of those recursive calls, | |
2642 | but of THIS instance of the call. | |
2643 | ||
2644 | To do this, we set the step_resume bp's frame to our | |
2645 | current caller's frame (step_frame_address, which is | |
2646 | set by the "next" or "until" command, before execution | |
2647 | begins). | |
2648 | ||
2649 | But ... don't do it if we're single-stepping out of a | |
2650 | sigtramp, because the reason we're single-stepping is | |
2651 | precisely because unwinding is a problem (HP-UX 10.20, | |
2652 | e.g.) and the frame address is likely to be incorrect. | |
2653 | No danger of sigtramp recursion. */ | |
2654 | ||
cd0fc7c3 | 2655 | if (ecs->stepping_through_sigtramp) |
c906108c SS |
2656 | { |
2657 | step_resume_breakpoint->frame = (CORE_ADDR) NULL; | |
cd0fc7c3 | 2658 | ecs->stepping_through_sigtramp = 0; |
c906108c SS |
2659 | } |
2660 | else if (!IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) | |
2661 | step_resume_breakpoint->frame = step_frame_address; | |
2662 | ||
2663 | if (breakpoints_inserted) | |
2664 | insert_breakpoints (); | |
2665 | } | |
2666 | goto keep_going; | |
2667 | ||
2668 | step_into_function: | |
2669 | /* Subroutine call with source code we should not step over. | |
2670 | Do step to the first line of code in it. */ | |
2671 | { | |
2672 | struct symtab *s; | |
2673 | ||
2674 | s = find_pc_symtab (stop_pc); | |
2675 | if (s && s->language != language_asm) | |
cd0fc7c3 | 2676 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); |
c906108c | 2677 | } |
cd0fc7c3 | 2678 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); |
c906108c SS |
2679 | /* Use the step_resume_break to step until |
2680 | the end of the prologue, even if that involves jumps | |
2681 | (as it seems to on the vax under 4.2). */ | |
2682 | /* If the prologue ends in the middle of a source line, | |
2683 | continue to the end of that source line (if it is still | |
2684 | within the function). Otherwise, just go to end of prologue. */ | |
2685 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP | |
2686 | /* no, don't either. It skips any code that's | |
2687 | legitimately on the first line. */ | |
2688 | #else | |
cd0fc7c3 SS |
2689 | if (ecs->sal.end && ecs->sal.pc != ecs->stop_func_start && ecs->sal.end < ecs->stop_func_end) |
2690 | ecs->stop_func_start = ecs->sal.end; | |
c906108c SS |
2691 | #endif |
2692 | ||
cd0fc7c3 | 2693 | if (ecs->stop_func_start == stop_pc) |
c906108c SS |
2694 | { |
2695 | /* We are already there: stop now. */ | |
2696 | stop_step = 1; | |
cd0fc7c3 | 2697 | goto wfi_break; |
c906108c SS |
2698 | } |
2699 | else | |
2700 | /* Put the step-breakpoint there and go until there. */ | |
2701 | { | |
2702 | struct symtab_and_line sr_sal; | |
2703 | ||
2704 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
cd0fc7c3 SS |
2705 | sr_sal.pc = ecs->stop_func_start; |
2706 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
c906108c SS |
2707 | /* Do not specify what the fp should be when we stop |
2708 | since on some machines the prologue | |
2709 | is where the new fp value is established. */ | |
2710 | step_resume_breakpoint = | |
2711 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2712 | if (breakpoints_inserted) | |
2713 | insert_breakpoints (); | |
2714 | ||
2715 | /* And make sure stepping stops right away then. */ | |
2716 | step_range_end = step_range_start; | |
2717 | } | |
2718 | goto keep_going; | |
2719 | } | |
2720 | ||
2721 | /* We've wandered out of the step range. */ | |
2722 | ||
cd0fc7c3 | 2723 | ecs->sal = find_pc_line (stop_pc, 0); |
c906108c SS |
2724 | |
2725 | if (step_range_end == 1) | |
2726 | { | |
2727 | /* It is stepi or nexti. We always want to stop stepping after | |
2728 | one instruction. */ | |
2729 | stop_step = 1; | |
cd0fc7c3 | 2730 | goto wfi_break; |
c906108c SS |
2731 | } |
2732 | ||
2733 | /* If we're in the return path from a shared library trampoline, | |
2734 | we want to proceed through the trampoline when stepping. */ | |
cd0fc7c3 | 2735 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) |
c906108c SS |
2736 | { |
2737 | CORE_ADDR tmp; | |
2738 | ||
2739 | /* Determine where this trampoline returns. */ | |
2740 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2741 | ||
2742 | /* Only proceed through if we know where it's going. */ | |
2743 | if (tmp) | |
2744 | { | |
2745 | /* And put the step-breakpoint there and go until there. */ | |
2746 | struct symtab_and_line sr_sal; | |
2747 | ||
2748 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
2749 | sr_sal.pc = tmp; | |
2750 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2751 | /* Do not specify what the fp should be when we stop | |
2752 | since on some machines the prologue | |
2753 | is where the new fp value is established. */ | |
2754 | step_resume_breakpoint = | |
2755 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2756 | if (breakpoints_inserted) | |
2757 | insert_breakpoints (); | |
2758 | ||
2759 | /* Restart without fiddling with the step ranges or | |
2760 | other state. */ | |
2761 | goto keep_going; | |
2762 | } | |
2763 | } | |
2764 | ||
cd0fc7c3 | 2765 | if (ecs->sal.line == 0) |
c906108c SS |
2766 | { |
2767 | /* We have no line number information. That means to stop | |
2768 | stepping (does this always happen right after one instruction, | |
2769 | when we do "s" in a function with no line numbers, | |
2770 | or can this happen as a result of a return or longjmp?). */ | |
2771 | stop_step = 1; | |
cd0fc7c3 | 2772 | goto wfi_break; |
c906108c SS |
2773 | } |
2774 | ||
cd0fc7c3 SS |
2775 | if ((stop_pc == ecs->sal.pc) |
2776 | && (ecs->current_line != ecs->sal.line || ecs->current_symtab != ecs->sal.symtab)) | |
c906108c SS |
2777 | { |
2778 | /* We are at the start of a different line. So stop. Note that | |
2779 | we don't stop if we step into the middle of a different line. | |
2780 | That is said to make things like for (;;) statements work | |
2781 | better. */ | |
2782 | stop_step = 1; | |
cd0fc7c3 | 2783 | goto wfi_break; |
c906108c SS |
2784 | } |
2785 | ||
2786 | /* We aren't done stepping. | |
2787 | ||
2788 | Optimize by setting the stepping range to the line. | |
2789 | (We might not be in the original line, but if we entered a | |
2790 | new line in mid-statement, we continue stepping. This makes | |
2791 | things like for(;;) statements work better.) */ | |
2792 | ||
cd0fc7c3 | 2793 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c906108c SS |
2794 | { |
2795 | /* If this is the last line of the function, don't keep stepping | |
2796 | (it would probably step us out of the function). | |
2797 | This is particularly necessary for a one-line function, | |
2798 | in which after skipping the prologue we better stop even though | |
2799 | we will be in mid-line. */ | |
2800 | stop_step = 1; | |
cd0fc7c3 | 2801 | goto wfi_break; |
c906108c | 2802 | } |
cd0fc7c3 SS |
2803 | step_range_start = ecs->sal.pc; |
2804 | step_range_end = ecs->sal.end; | |
c906108c | 2805 | step_frame_address = FRAME_FP (get_current_frame ()); |
cd0fc7c3 SS |
2806 | ecs->current_line = ecs->sal.line; |
2807 | ecs->current_symtab = ecs->sal.symtab; | |
c906108c SS |
2808 | |
2809 | /* In the case where we just stepped out of a function into the middle | |
2810 | of a line of the caller, continue stepping, but step_frame_address | |
2811 | must be modified to current frame */ | |
2812 | { | |
2813 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
2814 | if (!(INNER_THAN (current_frame, step_frame_address))) | |
2815 | step_frame_address = current_frame; | |
2816 | } | |
2817 | ||
2818 | ||
2819 | goto keep_going; | |
2820 | ||
2821 | check_sigtramp2: | |
2822 | if (trap_expected | |
cd0fc7c3 | 2823 | && IN_SIGTRAMP (stop_pc, ecs->stop_func_name) |
c906108c SS |
2824 | && !IN_SIGTRAMP (prev_pc, prev_func_name) |
2825 | && INNER_THAN (read_sp (), step_sp)) | |
2826 | { | |
2827 | /* What has happened here is that we have just stepped the inferior | |
2828 | with a signal (because it is a signal which shouldn't make | |
2829 | us stop), thus stepping into sigtramp. | |
2830 | ||
2831 | So we need to set a step_resume_break_address breakpoint | |
2832 | and continue until we hit it, and then step. FIXME: This should | |
2833 | be more enduring than a step_resume breakpoint; we should know | |
2834 | that we will later need to keep going rather than re-hitting | |
2835 | the breakpoint here (see testsuite/gdb.t06/signals.exp where | |
2836 | it says "exceedingly difficult"). */ | |
2837 | struct symtab_and_line sr_sal; | |
2838 | ||
2839 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
2840 | sr_sal.pc = prev_pc; | |
2841 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2842 | /* We perhaps could set the frame if we kept track of what | |
2843 | the frame corresponding to prev_pc was. But we don't, | |
2844 | so don't. */ | |
2845 | through_sigtramp_breakpoint = | |
2846 | set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp); | |
2847 | if (breakpoints_inserted) | |
2848 | insert_breakpoints (); | |
2849 | ||
cd0fc7c3 SS |
2850 | ecs->remove_breakpoints_on_following_step = 1; |
2851 | ecs->another_trap = 1; | |
c906108c SS |
2852 | } |
2853 | ||
2854 | keep_going: | |
2855 | /* Come to this label when you need to resume the inferior. | |
2856 | It's really much cleaner to do a goto than a maze of if-else | |
2857 | conditions. */ | |
2858 | ||
2859 | /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug | |
2860 | a vforked child beetween its creation and subsequent exit or | |
2861 | call to exec(). However, I had big problems in this rather | |
2862 | creaky exec engine, getting that to work. The fundamental | |
2863 | problem is that I'm trying to debug two processes via an | |
2864 | engine that only understands a single process with possibly | |
2865 | multiple threads. | |
2866 | ||
2867 | Hence, this spot is known to have problems when | |
2868 | target_can_follow_vfork_prior_to_exec returns 1. */ | |
2869 | ||
2870 | /* Save the pc before execution, to compare with pc after stop. */ | |
2871 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
cd0fc7c3 | 2872 | prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER |
c906108c SS |
2873 | BREAK is defined, the |
2874 | original pc would not have | |
2875 | been at the start of a | |
2876 | function. */ | |
cd0fc7c3 | 2877 | prev_func_name = ecs->stop_func_name; |
c906108c | 2878 | |
cd0fc7c3 | 2879 | if (ecs->update_step_sp) |
c906108c | 2880 | step_sp = read_sp (); |
cd0fc7c3 | 2881 | ecs->update_step_sp = 0; |
c906108c SS |
2882 | |
2883 | /* If we did not do break;, it means we should keep | |
2884 | running the inferior and not return to debugger. */ | |
2885 | ||
2886 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2887 | { | |
2888 | /* We took a signal (which we are supposed to pass through to | |
2889 | the inferior, else we'd have done a break above) and we | |
2890 | haven't yet gotten our trap. Simply continue. */ | |
cd0fc7c3 | 2891 | resume (currently_stepping (ecs), stop_signal); |
c906108c SS |
2892 | } |
2893 | else | |
2894 | { | |
2895 | /* Either the trap was not expected, but we are continuing | |
2896 | anyway (the user asked that this signal be passed to the | |
2897 | child) | |
2898 | -- or -- | |
2899 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2900 | decided we should resume from it. | |
2901 | ||
2902 | We're going to run this baby now! | |
2903 | ||
2904 | Insert breakpoints now, unless we are trying | |
2905 | to one-proceed past a breakpoint. */ | |
2906 | /* If we've just finished a special step resume and we don't | |
2907 | want to hit a breakpoint, pull em out. */ | |
2908 | if (step_resume_breakpoint == NULL | |
2909 | && through_sigtramp_breakpoint == NULL | |
cd0fc7c3 | 2910 | && ecs->remove_breakpoints_on_following_step) |
c906108c | 2911 | { |
cd0fc7c3 | 2912 | ecs->remove_breakpoints_on_following_step = 0; |
c906108c SS |
2913 | remove_breakpoints (); |
2914 | breakpoints_inserted = 0; | |
2915 | } | |
2916 | else if (!breakpoints_inserted && | |
cd0fc7c3 | 2917 | (through_sigtramp_breakpoint != NULL || !ecs->another_trap)) |
c906108c SS |
2918 | { |
2919 | breakpoints_failed = insert_breakpoints (); | |
2920 | if (breakpoints_failed) | |
cd0fc7c3 | 2921 | goto wfi_break; |
c906108c SS |
2922 | breakpoints_inserted = 1; |
2923 | } | |
2924 | ||
cd0fc7c3 | 2925 | trap_expected = ecs->another_trap; |
c906108c SS |
2926 | |
2927 | /* Do not deliver SIGNAL_TRAP (except when the user | |
2928 | explicitly specifies that such a signal should be | |
2929 | delivered to the target program). | |
2930 | ||
2931 | Typically, this would occure when a user is debugging a | |
2932 | target monitor on a simulator: the target monitor sets a | |
2933 | breakpoint; the simulator encounters this break-point and | |
2934 | halts the simulation handing control to GDB; GDB, noteing | |
2935 | that the break-point isn't valid, returns control back to | |
2936 | the simulator; the simulator then delivers the hardware | |
2937 | equivalent of a SIGNAL_TRAP to the program being | |
2938 | debugged. */ | |
2939 | ||
2940 | if (stop_signal == TARGET_SIGNAL_TRAP | |
2941 | && !signal_program[stop_signal]) | |
2942 | stop_signal = TARGET_SIGNAL_0; | |
2943 | ||
2944 | #ifdef SHIFT_INST_REGS | |
2945 | /* I'm not sure when this following segment applies. I do know, | |
2946 | now, that we shouldn't rewrite the regs when we were stopped | |
2947 | by a random signal from the inferior process. */ | |
2948 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? | |
2949 | (this is only used on the 88k). */ | |
2950 | ||
2951 | if (!bpstat_explains_signal (stop_bpstat) | |
2952 | && (stop_signal != TARGET_SIGNAL_CHLD) | |
2953 | && !stopped_by_random_signal) | |
2954 | SHIFT_INST_REGS (); | |
2955 | #endif /* SHIFT_INST_REGS */ | |
2956 | ||
cd0fc7c3 SS |
2957 | resume (currently_stepping (ecs), stop_signal); |
2958 | } | |
2959 | ||
2960 | /* Former continues in the main loop goto here. */ | |
2961 | wfi_continue: | |
2962 | /* This used to be at the top of the loop. */ | |
2963 | if (ecs->infwait_state == infwait_normal_state) | |
2964 | { | |
2965 | overlay_cache_invalid = 1; | |
2966 | ||
2967 | /* We have to invalidate the registers BEFORE calling | |
2968 | target_wait because they can be loaded from the target | |
2969 | while in target_wait. This makes remote debugging a bit | |
2970 | more efficient for those targets that provide critical | |
2971 | registers as part of their normal status mechanism. */ | |
2972 | ||
2973 | registers_changed (); | |
2974 | ecs->waiton_pid = -1; | |
2975 | ecs->wp = &(ecs->ws); | |
c906108c | 2976 | } |
cd0fc7c3 SS |
2977 | /* This is the old end of the while loop. Let everybody know |
2978 | we want to wait for the inferior some more and get called | |
2979 | again soon. */ | |
2980 | ecs->wait_some_more = 1; | |
2981 | return; | |
c906108c SS |
2982 | } |
2983 | ||
cd0fc7c3 SS |
2984 | /* Former breaks in the main loop goto here. */ |
2985 | wfi_break: | |
2986 | ||
c906108c SS |
2987 | stop_stepping: |
2988 | if (target_has_execution) | |
2989 | { | |
2990 | /* Are we stopping for a vfork event? We only stop when we see | |
2991 | the child's event. However, we may not yet have seen the | |
2992 | parent's event. And, inferior_pid is still set to the parent's | |
2993 | pid, until we resume again and follow either the parent or child. | |
2994 | ||
2995 | To ensure that we can really touch inferior_pid (aka, the | |
2996 | parent process) -- which calls to functions like read_pc | |
2997 | implicitly do -- wait on the parent if necessary. */ | |
2998 | if ((pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
2999 | && !pending_follow.fork_event.saw_parent_fork) | |
3000 | { | |
3001 | int parent_pid; | |
3002 | ||
3003 | do | |
3004 | { | |
3005 | if (target_wait_hook) | |
cd0fc7c3 | 3006 | parent_pid = target_wait_hook (-1, &(ecs->ws)); |
c906108c | 3007 | else |
cd0fc7c3 | 3008 | parent_pid = target_wait (-1, &(ecs->ws)); |
c906108c SS |
3009 | } |
3010 | while (parent_pid != inferior_pid); | |
3011 | } | |
3012 | ||
c906108c SS |
3013 | /* Assuming the inferior still exists, set these up for next |
3014 | time, just like we did above if we didn't break out of the | |
3015 | loop. */ | |
3016 | prev_pc = read_pc (); | |
cd0fc7c3 SS |
3017 | prev_func_start = ecs->stop_func_start; |
3018 | prev_func_name = ecs->stop_func_name; | |
c906108c | 3019 | } |
cd0fc7c3 SS |
3020 | /* Let callers know we don't want to wait for the inferior anymore. */ |
3021 | ecs->wait_some_more = 0; | |
3022 | } | |
3023 | ||
3024 | /* Are we in the middle of stepping? */ | |
3025 | ||
392a587b | 3026 | static int |
cd0fc7c3 SS |
3027 | currently_stepping (ecs) |
3028 | struct execution_control_state *ecs; | |
3029 | { | |
3030 | return ((through_sigtramp_breakpoint == NULL | |
3031 | && !ecs->handling_longjmp | |
3032 | && ((step_range_end && step_resume_breakpoint == NULL) | |
3033 | || trap_expected)) | |
3034 | || ecs->stepping_through_solib_after_catch | |
3035 | || bpstat_should_step ()); | |
c906108c SS |
3036 | } |
3037 | ||
3038 | /* This function returns TRUE if ep is an internal breakpoint | |
3039 | set to catch generic shared library (aka dynamically-linked | |
3040 | library) events. (This is *NOT* the same as a catchpoint for a | |
3041 | shlib event. The latter is something a user can set; this is | |
3042 | something gdb sets for its own use, and isn't ever shown to a | |
3043 | user.) */ | |
3044 | static int | |
3045 | is_internal_shlib_eventpoint (ep) | |
3046 | struct breakpoint *ep; | |
3047 | { | |
3048 | return | |
3049 | (ep->type == bp_shlib_event) | |
3050 | ; | |
3051 | } | |
3052 | ||
3053 | /* This function returns TRUE if bs indicates that the inferior | |
3054 | stopped due to a shared library (aka dynamically-linked library) | |
3055 | event. */ | |
3056 | static int | |
3057 | stopped_for_internal_shlib_event (bs) | |
3058 | bpstat bs; | |
3059 | { | |
3060 | /* Note that multiple eventpoints may've caused the stop. Any | |
3061 | that are associated with shlib events will be accepted. */ | |
3062 | for (; bs != NULL; bs = bs->next) | |
3063 | { | |
3064 | if ((bs->breakpoint_at != NULL) | |
3065 | && is_internal_shlib_eventpoint (bs->breakpoint_at)) | |
3066 | return 1; | |
3067 | } | |
3068 | ||
3069 | /* If we get here, then no candidate was found. */ | |
3070 | return 0; | |
3071 | } | |
3072 | ||
3073 | /* This function returns TRUE if bs indicates that the inferior | |
3074 | stopped due to a shared library (aka dynamically-linked library) | |
3075 | event caught by a catchpoint. | |
3076 | ||
3077 | If TRUE, cp_p is set to point to the catchpoint. | |
3078 | ||
3079 | Else, the value of cp_p is undefined. */ | |
3080 | static int | |
3081 | stopped_for_shlib_catchpoint (bs, cp_p) | |
3082 | bpstat bs; | |
3083 | struct breakpoint **cp_p; | |
3084 | { | |
3085 | /* Note that multiple eventpoints may've caused the stop. Any | |
3086 | that are associated with shlib events will be accepted. */ | |
3087 | *cp_p = NULL; | |
3088 | ||
3089 | for (; bs != NULL; bs = bs->next) | |
3090 | { | |
3091 | if ((bs->breakpoint_at != NULL) | |
3092 | && ep_is_shlib_catchpoint (bs->breakpoint_at)) | |
3093 | { | |
3094 | *cp_p = bs->breakpoint_at; | |
3095 | return 1; | |
3096 | } | |
3097 | } | |
3098 | ||
3099 | /* If we get here, then no candidate was found. */ | |
3100 | return 0; | |
3101 | } | |
3102 | \f | |
3103 | ||
43ff13b4 JM |
3104 | /* Reset proper settings after an asynchronous command has finished. |
3105 | If the execution command was in synchronous mode, register stdin | |
3106 | with the event loop, and reset the prompt. */ | |
3107 | static void | |
3108 | complete_execution () | |
3109 | { | |
3110 | extern cleanup_sigint_signal_handler PARAMS ((void)); | |
3111 | ||
3112 | if (sync_execution) | |
3113 | { | |
3114 | add_file_handler (input_fd, (file_handler_func *) call_readline, 0); | |
3115 | pop_prompt (); | |
3116 | sync_execution = 0; | |
3117 | cleanup_sigint_signal_handler (); | |
3118 | display_gdb_prompt (0); | |
3119 | } | |
3120 | target_executing = 0; | |
3121 | } | |
3122 | ||
c906108c SS |
3123 | /* Here to return control to GDB when the inferior stops for real. |
3124 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3125 | ||
3126 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3127 | (pc, function, args, file, line number and line text). | |
3128 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3129 | attempting to insert breakpoints. */ | |
3130 | ||
3131 | void | |
3132 | normal_stop () | |
3133 | { | |
c906108c SS |
3134 | /* As with the notification of thread events, we want to delay |
3135 | notifying the user that we've switched thread context until | |
3136 | the inferior actually stops. | |
3137 | ||
3138 | (Note that there's no point in saying anything if the inferior | |
3139 | has exited!) */ | |
7a292a7a SS |
3140 | if (may_switch_from_inferior_pid |
3141 | && (switched_from_inferior_pid != inferior_pid) | |
3142 | && target_has_execution) | |
c906108c SS |
3143 | { |
3144 | target_terminal_ours_for_output (); | |
3145 | printf_filtered ("[Switched to %s]\n", | |
3146 | target_pid_or_tid_to_str (inferior_pid)); | |
3147 | switched_from_inferior_pid = inferior_pid; | |
3148 | } | |
c906108c SS |
3149 | |
3150 | /* Make sure that the current_frame's pc is correct. This | |
3151 | is a correction for setting up the frame info before doing | |
3152 | DECR_PC_AFTER_BREAK */ | |
3153 | if (target_has_execution && get_current_frame ()) | |
3154 | (get_current_frame ())->pc = read_pc (); | |
3155 | ||
3156 | if (breakpoints_failed) | |
3157 | { | |
3158 | target_terminal_ours_for_output (); | |
3159 | print_sys_errmsg ("ptrace", breakpoints_failed); | |
3160 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ | |
3161 | The same program may be running in another process.\n"); | |
3162 | } | |
3163 | ||
3164 | if (target_has_execution && breakpoints_inserted) | |
3165 | { | |
3166 | if (remove_breakpoints ()) | |
3167 | { | |
3168 | target_terminal_ours_for_output (); | |
3169 | printf_filtered ("Cannot remove breakpoints because "); | |
3170 | printf_filtered ("program is no longer writable.\n"); | |
3171 | printf_filtered ("It might be running in another process.\n"); | |
3172 | printf_filtered ("Further execution is probably impossible.\n"); | |
3173 | } | |
3174 | } | |
3175 | breakpoints_inserted = 0; | |
3176 | ||
3177 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3178 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3179 | ||
3180 | breakpoint_auto_delete (stop_bpstat); | |
3181 | ||
3182 | /* If an auto-display called a function and that got a signal, | |
3183 | delete that auto-display to avoid an infinite recursion. */ | |
3184 | ||
3185 | if (stopped_by_random_signal) | |
3186 | disable_current_display (); | |
3187 | ||
3188 | /* Don't print a message if in the middle of doing a "step n" | |
3189 | operation for n > 1 */ | |
3190 | if (step_multi && stop_step) | |
3191 | goto done; | |
3192 | ||
3193 | target_terminal_ours (); | |
3194 | ||
3195 | /* Did we stop because the user set the stop_on_solib_events | |
3196 | variable? (If so, we report this as a generic, "Stopped due | |
3197 | to shlib event" message.) */ | |
3198 | if (stopped_for_internal_shlib_event (stop_bpstat)) | |
3199 | { | |
3200 | printf_filtered ("Stopped due to shared library event\n"); | |
3201 | } | |
3202 | ||
3203 | /* Look up the hook_stop and run it if it exists. */ | |
3204 | ||
3205 | if (stop_command && stop_command->hook) | |
3206 | { | |
3207 | catch_errors (hook_stop_stub, stop_command->hook, | |
3208 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
3209 | } | |
3210 | ||
3211 | if (!target_has_stack) | |
3212 | { | |
3213 | ||
3214 | goto done; | |
3215 | } | |
3216 | ||
3217 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3218 | and current location is based on that. | |
3219 | Don't do this on return from a stack dummy routine, | |
3220 | or if the program has exited. */ | |
3221 | ||
3222 | if (!stop_stack_dummy) | |
3223 | { | |
3224 | select_frame (get_current_frame (), 0); | |
3225 | ||
3226 | /* Print current location without a level number, if | |
3227 | we have changed functions or hit a breakpoint. | |
3228 | Print source line if we have one. | |
3229 | bpstat_print() contains the logic deciding in detail | |
3230 | what to print, based on the event(s) that just occurred. */ | |
3231 | ||
3232 | if (stop_print_frame) | |
3233 | { | |
3234 | int bpstat_ret; | |
3235 | int source_flag; | |
3236 | ||
3237 | bpstat_ret = bpstat_print (stop_bpstat); | |
3238 | /* bpstat_print() returned one of: | |
3239 | -1: Didn't print anything | |
3240 | 0: Printed preliminary "Breakpoint n, " message, desires | |
3241 | location tacked on | |
3242 | 1: Printed something, don't tack on location */ | |
3243 | ||
3244 | if (bpstat_ret == -1) | |
3245 | if (stop_step | |
3246 | && step_frame_address == FRAME_FP (get_current_frame ()) | |
3247 | && step_start_function == find_pc_function (stop_pc)) | |
3248 | source_flag = -1; /* finished step, just print source line */ | |
3249 | else | |
3250 | source_flag = 1; /* print location and source line */ | |
3251 | else if (bpstat_ret == 0) /* hit bpt, desire location */ | |
3252 | source_flag = 1; /* print location and source line */ | |
3253 | else /* bpstat_ret == 1, hit bpt, do not desire location */ | |
3254 | source_flag = -1; /* just print source line */ | |
3255 | ||
3256 | /* The behavior of this routine with respect to the source | |
3257 | flag is: | |
3258 | -1: Print only source line | |
3259 | 0: Print only location | |
3260 | 1: Print location and source line */ | |
3261 | show_and_print_stack_frame (selected_frame, -1, source_flag); | |
3262 | ||
3263 | /* Display the auto-display expressions. */ | |
3264 | do_displays (); | |
3265 | } | |
3266 | } | |
3267 | ||
3268 | /* Save the function value return registers, if we care. | |
3269 | We might be about to restore their previous contents. */ | |
3270 | if (proceed_to_finish) | |
3271 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
3272 | ||
3273 | if (stop_stack_dummy) | |
3274 | { | |
3275 | /* Pop the empty frame that contains the stack dummy. | |
3276 | POP_FRAME ends with a setting of the current frame, so we | |
3277 | can use that next. */ | |
3278 | POP_FRAME; | |
3279 | /* Set stop_pc to what it was before we called the function. | |
3280 | Can't rely on restore_inferior_status because that only gets | |
3281 | called if we don't stop in the called function. */ | |
3282 | stop_pc = read_pc (); | |
3283 | select_frame (get_current_frame (), 0); | |
3284 | } | |
3285 | ||
3286 | ||
3287 | TUIDO (((TuiOpaqueFuncPtr) tui_vCheckDataValues, selected_frame)); | |
3288 | ||
3289 | done: | |
3290 | annotate_stopped (); | |
3291 | } | |
3292 | ||
3293 | static int | |
3294 | hook_stop_stub (cmd) | |
3295 | PTR cmd; | |
3296 | { | |
3297 | execute_user_command ((struct cmd_list_element *) cmd, 0); | |
3298 | return (0); | |
3299 | } | |
3300 | \f | |
3301 | int | |
3302 | signal_stop_state (signo) | |
3303 | int signo; | |
3304 | { | |
3305 | return signal_stop[signo]; | |
3306 | } | |
3307 | ||
3308 | int | |
3309 | signal_print_state (signo) | |
3310 | int signo; | |
3311 | { | |
3312 | return signal_print[signo]; | |
3313 | } | |
3314 | ||
3315 | int | |
3316 | signal_pass_state (signo) | |
3317 | int signo; | |
3318 | { | |
3319 | return signal_program[signo]; | |
3320 | } | |
3321 | ||
3322 | static void | |
3323 | sig_print_header () | |
3324 | { | |
3325 | printf_filtered ("\ | |
3326 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3327 | } | |
3328 | ||
3329 | static void | |
3330 | sig_print_info (oursig) | |
3331 | enum target_signal oursig; | |
3332 | { | |
3333 | char *name = target_signal_to_name (oursig); | |
3334 | int name_padding = 13 - strlen (name); | |
3335 | if (name_padding <= 0) | |
3336 | name_padding = 0; | |
3337 | ||
3338 | printf_filtered ("%s", name); | |
3339 | printf_filtered ("%*.*s ", name_padding, name_padding, | |
3340 | " "); | |
3341 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
3342 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3343 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3344 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3345 | } | |
3346 | ||
3347 | /* Specify how various signals in the inferior should be handled. */ | |
3348 | ||
3349 | static void | |
3350 | handle_command (args, from_tty) | |
3351 | char *args; | |
3352 | int from_tty; | |
3353 | { | |
3354 | char **argv; | |
3355 | int digits, wordlen; | |
3356 | int sigfirst, signum, siglast; | |
3357 | enum target_signal oursig; | |
3358 | int allsigs; | |
3359 | int nsigs; | |
3360 | unsigned char *sigs; | |
3361 | struct cleanup *old_chain; | |
3362 | ||
3363 | if (args == NULL) | |
3364 | { | |
3365 | error_no_arg ("signal to handle"); | |
3366 | } | |
3367 | ||
3368 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3369 | ||
3370 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3371 | sigs = (unsigned char *) alloca (nsigs); | |
3372 | memset (sigs, 0, nsigs); | |
3373 | ||
3374 | /* Break the command line up into args. */ | |
3375 | ||
3376 | argv = buildargv (args); | |
3377 | if (argv == NULL) | |
3378 | { | |
3379 | nomem (0); | |
3380 | } | |
7a292a7a | 3381 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3382 | |
3383 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3384 | actions. Signal numbers and signal names may be interspersed with | |
3385 | actions, with the actions being performed for all signals cumulatively | |
3386 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3387 | ||
3388 | while (*argv != NULL) | |
3389 | { | |
3390 | wordlen = strlen (*argv); | |
3391 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3392 | {; | |
3393 | } | |
3394 | allsigs = 0; | |
3395 | sigfirst = siglast = -1; | |
3396 | ||
3397 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3398 | { | |
3399 | /* Apply action to all signals except those used by the | |
3400 | debugger. Silently skip those. */ | |
3401 | allsigs = 1; | |
3402 | sigfirst = 0; | |
3403 | siglast = nsigs - 1; | |
3404 | } | |
3405 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3406 | { | |
3407 | SET_SIGS (nsigs, sigs, signal_stop); | |
3408 | SET_SIGS (nsigs, sigs, signal_print); | |
3409 | } | |
3410 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3411 | { | |
3412 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3413 | } | |
3414 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3415 | { | |
3416 | SET_SIGS (nsigs, sigs, signal_print); | |
3417 | } | |
3418 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3419 | { | |
3420 | SET_SIGS (nsigs, sigs, signal_program); | |
3421 | } | |
3422 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3423 | { | |
3424 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3425 | } | |
3426 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3427 | { | |
3428 | SET_SIGS (nsigs, sigs, signal_program); | |
3429 | } | |
3430 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3431 | { | |
3432 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3433 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3434 | } | |
3435 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3436 | { | |
3437 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3438 | } | |
3439 | else if (digits > 0) | |
3440 | { | |
3441 | /* It is numeric. The numeric signal refers to our own | |
3442 | internal signal numbering from target.h, not to host/target | |
3443 | signal number. This is a feature; users really should be | |
3444 | using symbolic names anyway, and the common ones like | |
3445 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3446 | ||
3447 | sigfirst = siglast = (int) | |
3448 | target_signal_from_command (atoi (*argv)); | |
3449 | if ((*argv)[digits] == '-') | |
3450 | { | |
3451 | siglast = (int) | |
3452 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3453 | } | |
3454 | if (sigfirst > siglast) | |
3455 | { | |
3456 | /* Bet he didn't figure we'd think of this case... */ | |
3457 | signum = sigfirst; | |
3458 | sigfirst = siglast; | |
3459 | siglast = signum; | |
3460 | } | |
3461 | } | |
3462 | else | |
3463 | { | |
3464 | oursig = target_signal_from_name (*argv); | |
3465 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3466 | { | |
3467 | sigfirst = siglast = (int) oursig; | |
3468 | } | |
3469 | else | |
3470 | { | |
3471 | /* Not a number and not a recognized flag word => complain. */ | |
3472 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3473 | } | |
3474 | } | |
3475 | ||
3476 | /* If any signal numbers or symbol names were found, set flags for | |
3477 | which signals to apply actions to. */ | |
3478 | ||
3479 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3480 | { | |
3481 | switch ((enum target_signal) signum) | |
3482 | { | |
3483 | case TARGET_SIGNAL_TRAP: | |
3484 | case TARGET_SIGNAL_INT: | |
3485 | if (!allsigs && !sigs[signum]) | |
3486 | { | |
3487 | if (query ("%s is used by the debugger.\n\ | |
3488 | Are you sure you want to change it? ", | |
3489 | target_signal_to_name | |
3490 | ((enum target_signal) signum))) | |
3491 | { | |
3492 | sigs[signum] = 1; | |
3493 | } | |
3494 | else | |
3495 | { | |
3496 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3497 | gdb_flush (gdb_stdout); | |
3498 | } | |
3499 | } | |
3500 | break; | |
3501 | case TARGET_SIGNAL_0: | |
3502 | case TARGET_SIGNAL_DEFAULT: | |
3503 | case TARGET_SIGNAL_UNKNOWN: | |
3504 | /* Make sure that "all" doesn't print these. */ | |
3505 | break; | |
3506 | default: | |
3507 | sigs[signum] = 1; | |
3508 | break; | |
3509 | } | |
3510 | } | |
3511 | ||
3512 | argv++; | |
3513 | } | |
3514 | ||
3515 | target_notice_signals (inferior_pid); | |
3516 | ||
3517 | if (from_tty) | |
3518 | { | |
3519 | /* Show the results. */ | |
3520 | sig_print_header (); | |
3521 | for (signum = 0; signum < nsigs; signum++) | |
3522 | { | |
3523 | if (sigs[signum]) | |
3524 | { | |
3525 | sig_print_info (signum); | |
3526 | } | |
3527 | } | |
3528 | } | |
3529 | ||
3530 | do_cleanups (old_chain); | |
3531 | } | |
3532 | ||
3533 | static void | |
3534 | xdb_handle_command (args, from_tty) | |
3535 | char *args; | |
3536 | int from_tty; | |
3537 | { | |
3538 | char **argv; | |
3539 | struct cleanup *old_chain; | |
3540 | ||
3541 | /* Break the command line up into args. */ | |
3542 | ||
3543 | argv = buildargv (args); | |
3544 | if (argv == NULL) | |
3545 | { | |
3546 | nomem (0); | |
3547 | } | |
7a292a7a | 3548 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3549 | if (argv[1] != (char *) NULL) |
3550 | { | |
3551 | char *argBuf; | |
3552 | int bufLen; | |
3553 | ||
3554 | bufLen = strlen (argv[0]) + 20; | |
3555 | argBuf = (char *) xmalloc (bufLen); | |
3556 | if (argBuf) | |
3557 | { | |
3558 | int validFlag = 1; | |
3559 | enum target_signal oursig; | |
3560 | ||
3561 | oursig = target_signal_from_name (argv[0]); | |
3562 | memset (argBuf, 0, bufLen); | |
3563 | if (strcmp (argv[1], "Q") == 0) | |
3564 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3565 | else | |
3566 | { | |
3567 | if (strcmp (argv[1], "s") == 0) | |
3568 | { | |
3569 | if (!signal_stop[oursig]) | |
3570 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3571 | else | |
3572 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3573 | } | |
3574 | else if (strcmp (argv[1], "i") == 0) | |
3575 | { | |
3576 | if (!signal_program[oursig]) | |
3577 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3578 | else | |
3579 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3580 | } | |
3581 | else if (strcmp (argv[1], "r") == 0) | |
3582 | { | |
3583 | if (!signal_print[oursig]) | |
3584 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3585 | else | |
3586 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3587 | } | |
3588 | else | |
3589 | validFlag = 0; | |
3590 | } | |
3591 | if (validFlag) | |
3592 | handle_command (argBuf, from_tty); | |
3593 | else | |
3594 | printf_filtered ("Invalid signal handling flag.\n"); | |
3595 | if (argBuf) | |
3596 | free (argBuf); | |
3597 | } | |
3598 | } | |
3599 | do_cleanups (old_chain); | |
3600 | } | |
3601 | ||
3602 | /* Print current contents of the tables set by the handle command. | |
3603 | It is possible we should just be printing signals actually used | |
3604 | by the current target (but for things to work right when switching | |
3605 | targets, all signals should be in the signal tables). */ | |
3606 | ||
3607 | static void | |
3608 | signals_info (signum_exp, from_tty) | |
3609 | char *signum_exp; | |
3610 | int from_tty; | |
3611 | { | |
3612 | enum target_signal oursig; | |
3613 | sig_print_header (); | |
3614 | ||
3615 | if (signum_exp) | |
3616 | { | |
3617 | /* First see if this is a symbol name. */ | |
3618 | oursig = target_signal_from_name (signum_exp); | |
3619 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3620 | { | |
3621 | /* No, try numeric. */ | |
3622 | oursig = | |
3623 | target_signal_from_command (parse_and_eval_address (signum_exp)); | |
3624 | } | |
3625 | sig_print_info (oursig); | |
3626 | return; | |
3627 | } | |
3628 | ||
3629 | printf_filtered ("\n"); | |
3630 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3631 | for (oursig = TARGET_SIGNAL_FIRST; | |
3632 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3633 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3634 | { | |
3635 | QUIT; | |
3636 | ||
3637 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
3638 | && oursig != TARGET_SIGNAL_DEFAULT | |
3639 | && oursig != TARGET_SIGNAL_0) | |
3640 | sig_print_info (oursig); | |
3641 | } | |
3642 | ||
3643 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3644 | } | |
3645 | \f | |
7a292a7a SS |
3646 | struct inferior_status |
3647 | { | |
3648 | enum target_signal stop_signal; | |
3649 | CORE_ADDR stop_pc; | |
3650 | bpstat stop_bpstat; | |
3651 | int stop_step; | |
3652 | int stop_stack_dummy; | |
3653 | int stopped_by_random_signal; | |
3654 | int trap_expected; | |
3655 | CORE_ADDR step_range_start; | |
3656 | CORE_ADDR step_range_end; | |
3657 | CORE_ADDR step_frame_address; | |
3658 | int step_over_calls; | |
3659 | CORE_ADDR step_resume_break_address; | |
3660 | int stop_after_trap; | |
3661 | int stop_soon_quietly; | |
3662 | CORE_ADDR selected_frame_address; | |
3663 | char *stop_registers; | |
3664 | ||
3665 | /* These are here because if call_function_by_hand has written some | |
3666 | registers and then decides to call error(), we better not have changed | |
3667 | any registers. */ | |
3668 | char *registers; | |
3669 | ||
3670 | int selected_level; | |
3671 | int breakpoint_proceeded; | |
3672 | int restore_stack_info; | |
3673 | int proceed_to_finish; | |
3674 | }; | |
3675 | ||
3676 | ||
3677 | static struct inferior_status *xmalloc_inferior_status PARAMS ((void)); | |
3678 | static struct inferior_status * | |
3679 | xmalloc_inferior_status () | |
3680 | { | |
3681 | struct inferior_status *inf_status; | |
3682 | inf_status = xmalloc (sizeof (struct inferior_status)); | |
3683 | inf_status->stop_registers = xmalloc (REGISTER_BYTES); | |
3684 | inf_status->registers = xmalloc (REGISTER_BYTES); | |
3685 | return inf_status; | |
3686 | } | |
3687 | ||
3688 | static void free_inferior_status PARAMS ((struct inferior_status *)); | |
3689 | static void | |
3690 | free_inferior_status (inf_status) | |
3691 | struct inferior_status *inf_status; | |
3692 | { | |
3693 | free (inf_status->registers); | |
3694 | free (inf_status->stop_registers); | |
3695 | free (inf_status); | |
3696 | } | |
3697 | ||
3698 | void | |
3699 | write_inferior_status_register (inf_status, regno, val) | |
3700 | struct inferior_status *inf_status; | |
3701 | int regno; | |
3702 | LONGEST val; | |
3703 | { | |
3704 | int size = REGISTER_RAW_SIZE(regno); | |
3705 | void *buf = alloca (size); | |
3706 | store_signed_integer (buf, size, val); | |
3707 | memcpy (&inf_status->registers[REGISTER_BYTE (regno)], buf, size); | |
3708 | } | |
3709 | ||
3710 | ||
3711 | ||
c906108c SS |
3712 | /* Save all of the information associated with the inferior<==>gdb |
3713 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3714 | (defined in inferior.h). */ | |
3715 | ||
7a292a7a SS |
3716 | struct inferior_status * |
3717 | save_inferior_status (restore_stack_info) | |
c906108c SS |
3718 | int restore_stack_info; |
3719 | { | |
7a292a7a SS |
3720 | struct inferior_status *inf_status = xmalloc_inferior_status (); |
3721 | ||
c906108c SS |
3722 | inf_status->stop_signal = stop_signal; |
3723 | inf_status->stop_pc = stop_pc; | |
3724 | inf_status->stop_step = stop_step; | |
3725 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3726 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3727 | inf_status->trap_expected = trap_expected; | |
3728 | inf_status->step_range_start = step_range_start; | |
3729 | inf_status->step_range_end = step_range_end; | |
3730 | inf_status->step_frame_address = step_frame_address; | |
3731 | inf_status->step_over_calls = step_over_calls; | |
3732 | inf_status->stop_after_trap = stop_after_trap; | |
3733 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
3734 | /* Save original bpstat chain here; replace it with copy of chain. | |
3735 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3736 | hand them back the original chain when restore_inferior_status is |
3737 | called. */ | |
c906108c SS |
3738 | inf_status->stop_bpstat = stop_bpstat; |
3739 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3740 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3741 | inf_status->restore_stack_info = restore_stack_info; | |
3742 | inf_status->proceed_to_finish = proceed_to_finish; | |
7a292a7a | 3743 | |
c906108c SS |
3744 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
3745 | ||
3746 | read_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
3747 | ||
3748 | record_selected_frame (&(inf_status->selected_frame_address), | |
3749 | &(inf_status->selected_level)); | |
7a292a7a | 3750 | return inf_status; |
c906108c SS |
3751 | } |
3752 | ||
3753 | struct restore_selected_frame_args | |
3754 | { | |
3755 | CORE_ADDR frame_address; | |
3756 | int level; | |
3757 | }; | |
3758 | ||
3759 | static int restore_selected_frame PARAMS ((PTR)); | |
3760 | ||
c906108c SS |
3761 | static int |
3762 | restore_selected_frame (args) | |
3763 | PTR args; | |
3764 | { | |
3765 | struct restore_selected_frame_args *fr = | |
3766 | (struct restore_selected_frame_args *) args; | |
3767 | struct frame_info *frame; | |
3768 | int level = fr->level; | |
3769 | ||
3770 | frame = find_relative_frame (get_current_frame (), &level); | |
3771 | ||
3772 | /* If inf_status->selected_frame_address is NULL, there was no | |
3773 | previously selected frame. */ | |
3774 | if (frame == NULL || | |
3775 | /* FRAME_FP (frame) != fr->frame_address || */ | |
3776 | /* elz: deleted this check as a quick fix to the problem that | |
3777 | for function called by hand gdb creates no internal frame | |
3778 | structure and the real stack and gdb's idea of stack are | |
3779 | different if nested calls by hands are made. | |
3780 | ||
3781 | mvs: this worries me. */ | |
3782 | level != 0) | |
3783 | { | |
3784 | warning ("Unable to restore previously selected frame.\n"); | |
3785 | return 0; | |
3786 | } | |
3787 | ||
3788 | select_frame (frame, fr->level); | |
3789 | ||
3790 | return (1); | |
3791 | } | |
3792 | ||
3793 | void | |
3794 | restore_inferior_status (inf_status) | |
3795 | struct inferior_status *inf_status; | |
3796 | { | |
3797 | stop_signal = inf_status->stop_signal; | |
3798 | stop_pc = inf_status->stop_pc; | |
3799 | stop_step = inf_status->stop_step; | |
3800 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3801 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3802 | trap_expected = inf_status->trap_expected; | |
3803 | step_range_start = inf_status->step_range_start; | |
3804 | step_range_end = inf_status->step_range_end; | |
3805 | step_frame_address = inf_status->step_frame_address; | |
3806 | step_over_calls = inf_status->step_over_calls; | |
3807 | stop_after_trap = inf_status->stop_after_trap; | |
3808 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
3809 | bpstat_clear (&stop_bpstat); | |
3810 | stop_bpstat = inf_status->stop_bpstat; | |
3811 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3812 | proceed_to_finish = inf_status->proceed_to_finish; | |
3813 | ||
7a292a7a | 3814 | /* FIXME: Is the restore of stop_registers always needed */ |
c906108c SS |
3815 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
3816 | ||
3817 | /* The inferior can be gone if the user types "print exit(0)" | |
3818 | (and perhaps other times). */ | |
3819 | if (target_has_execution) | |
3820 | write_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
3821 | ||
c906108c SS |
3822 | /* FIXME: If we are being called after stopping in a function which |
3823 | is called from gdb, we should not be trying to restore the | |
3824 | selected frame; it just prints a spurious error message (The | |
3825 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3826 | clobbers the stack)). In fact, should we be restoring the | |
3827 | inferior status at all in that case? . */ | |
3828 | ||
3829 | if (target_has_stack && inf_status->restore_stack_info) | |
3830 | { | |
3831 | struct restore_selected_frame_args fr; | |
3832 | fr.level = inf_status->selected_level; | |
3833 | fr.frame_address = inf_status->selected_frame_address; | |
3834 | /* The point of catch_errors is that if the stack is clobbered, | |
3835 | walking the stack might encounter a garbage pointer and error() | |
3836 | trying to dereference it. */ | |
3837 | if (catch_errors (restore_selected_frame, &fr, | |
3838 | "Unable to restore previously selected frame:\n", | |
3839 | RETURN_MASK_ERROR) == 0) | |
3840 | /* Error in restoring the selected frame. Select the innermost | |
3841 | frame. */ | |
3842 | ||
3843 | ||
3844 | select_frame (get_current_frame (), 0); | |
3845 | ||
3846 | } | |
c906108c | 3847 | |
7a292a7a SS |
3848 | free_inferior_status (inf_status); |
3849 | } | |
c906108c SS |
3850 | |
3851 | void | |
7a292a7a SS |
3852 | discard_inferior_status (inf_status) |
3853 | struct inferior_status *inf_status; | |
3854 | { | |
3855 | /* See save_inferior_status for info on stop_bpstat. */ | |
3856 | bpstat_clear (&inf_status->stop_bpstat); | |
3857 | free_inferior_status (inf_status); | |
3858 | } | |
3859 | ||
3860 | static void | |
c906108c SS |
3861 | set_follow_fork_mode_command (arg, from_tty, c) |
3862 | char *arg; | |
3863 | int from_tty; | |
3864 | struct cmd_list_element *c; | |
3865 | { | |
3866 | if (!STREQ (arg, "parent") && | |
3867 | !STREQ (arg, "child") && | |
3868 | !STREQ (arg, "both") && | |
3869 | !STREQ (arg, "ask")) | |
3870 | error ("follow-fork-mode must be one of \"parent\", \"child\", \"both\" or \"ask\"."); | |
3871 | ||
3872 | if (follow_fork_mode_string != NULL) | |
3873 | free (follow_fork_mode_string); | |
3874 | follow_fork_mode_string = savestring (arg, strlen (arg)); | |
3875 | } | |
7a292a7a SS |
3876 | |
3877 | ||
c906108c | 3878 | \f |
7a292a7a SS |
3879 | static void build_infrun PARAMS ((void)); |
3880 | static void | |
3881 | build_infrun () | |
3882 | { | |
3883 | stop_registers = xmalloc (REGISTER_BYTES); | |
3884 | } | |
c906108c SS |
3885 | |
3886 | ||
3887 | void | |
3888 | _initialize_infrun () | |
3889 | { | |
3890 | register int i; | |
3891 | register int numsigs; | |
3892 | struct cmd_list_element *c; | |
3893 | ||
7a292a7a SS |
3894 | build_infrun (); |
3895 | ||
0f71a2f6 JM |
3896 | register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL); |
3897 | register_gdbarch_swap (NULL, 0, build_infrun); | |
3898 | ||
c906108c SS |
3899 | add_info ("signals", signals_info, |
3900 | "What debugger does when program gets various signals.\n\ | |
3901 | Specify a signal as argument to print info on that signal only."); | |
3902 | add_info_alias ("handle", "signals", 0); | |
3903 | ||
3904 | add_com ("handle", class_run, handle_command, | |
3905 | concat ("Specify how to handle a signal.\n\ | |
3906 | Args are signals and actions to apply to those signals.\n\ | |
3907 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3908 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3909 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3910 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
3911 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
3912 | "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
3913 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ | |
3914 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3915 | Print means print a message if this signal happens.\n\ | |
3916 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3917 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3918 | Pass and Stop may be combined.", NULL)); | |
3919 | if (xdb_commands) | |
3920 | { | |
3921 | add_com ("lz", class_info, signals_info, | |
3922 | "What debugger does when program gets various signals.\n\ | |
3923 | Specify a signal as argument to print info on that signal only."); | |
3924 | add_com ("z", class_run, xdb_handle_command, | |
3925 | concat ("Specify how to handle a signal.\n\ | |
3926 | Args are signals and actions to apply to those signals.\n\ | |
3927 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3928 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3929 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3930 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
3931 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
3932 | "Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
3933 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ | |
3934 | nopass), \"Q\" (noprint)\n\ | |
3935 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3936 | Print means print a message if this signal happens.\n\ | |
3937 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3938 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3939 | Pass and Stop may be combined.", NULL)); | |
3940 | } | |
3941 | ||
3942 | if (!dbx_commands) | |
3943 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, | |
3944 | "There is no `stop' command, but you can set a hook on `stop'.\n\ | |
3945 | This allows you to set a list of commands to be run each time execution\n\ | |
3946 | of the program stops.", &cmdlist); | |
3947 | ||
3948 | numsigs = (int) TARGET_SIGNAL_LAST; | |
3949 | signal_stop = (unsigned char *) | |
3950 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
3951 | signal_print = (unsigned char *) | |
3952 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3953 | signal_program = (unsigned char *) | |
3954 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3955 | for (i = 0; i < numsigs; i++) | |
3956 | { | |
3957 | signal_stop[i] = 1; | |
3958 | signal_print[i] = 1; | |
3959 | signal_program[i] = 1; | |
3960 | } | |
3961 | ||
3962 | /* Signals caused by debugger's own actions | |
3963 | should not be given to the program afterwards. */ | |
3964 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
3965 | signal_program[TARGET_SIGNAL_INT] = 0; | |
3966 | ||
3967 | /* Signals that are not errors should not normally enter the debugger. */ | |
3968 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
3969 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
3970 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
3971 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
3972 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
3973 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
3974 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
3975 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
3976 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
3977 | signal_print[TARGET_SIGNAL_IO] = 0; | |
3978 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
3979 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
3980 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
3981 | signal_print[TARGET_SIGNAL_URG] = 0; | |
3982 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
3983 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
3984 | ||
cd0fc7c3 SS |
3985 | /* These signals are used internally by user-level thread |
3986 | implementations. (See signal(5) on Solaris.) Like the above | |
3987 | signals, a healthy program receives and handles them as part of | |
3988 | its normal operation. */ | |
3989 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
3990 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
3991 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
3992 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
3993 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
3994 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
3995 | ||
c906108c SS |
3996 | #ifdef SOLIB_ADD |
3997 | add_show_from_set | |
3998 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
3999 | (char *) &stop_on_solib_events, | |
4000 | "Set stopping for shared library events.\n\ | |
4001 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
4002 | notifies gdb of shared library events. The most common event of interest\n\ | |
4003 | to the user would be loading/unloading of a new library.\n", | |
4004 | &setlist), | |
4005 | &showlist); | |
4006 | #endif | |
4007 | ||
4008 | c = add_set_enum_cmd ("follow-fork-mode", | |
4009 | class_run, | |
4010 | follow_fork_mode_kind_names, | |
4011 | (char *) &follow_fork_mode_string, | |
4012 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 | |
4013 | kernel problem. It's also not terribly useful without a GUI to | |
4014 | help the user drive two debuggers. So for now, I'm disabling | |
4015 | the "both" option. */ | |
4016 | /* "Set debugger response to a program call of fork \ | |
4017 | or vfork.\n\ | |
4018 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4019 | parent - the original process is debugged after a fork\n\ | |
4020 | child - the new process is debugged after a fork\n\ | |
4021 | both - both the parent and child are debugged after a fork\n\ | |
4022 | ask - the debugger will ask for one of the above choices\n\ | |
4023 | For \"both\", another copy of the debugger will be started to follow\n\ | |
4024 | the new child process. The original debugger will continue to follow\n\ | |
4025 | the original parent process. To distinguish their prompts, the\n\ | |
4026 | debugger copy's prompt will be changed.\n\ | |
4027 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4028 | By default, the debugger will follow the parent process.", | |
4029 | */ | |
4030 | "Set debugger response to a program call of fork \ | |
4031 | or vfork.\n\ | |
4032 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4033 | parent - the original process is debugged after a fork\n\ | |
4034 | child - the new process is debugged after a fork\n\ | |
4035 | ask - the debugger will ask for one of the above choices\n\ | |
4036 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4037 | By default, the debugger will follow the parent process.", | |
4038 | &setlist); | |
4039 | /* c->function.sfunc = ;*/ | |
4040 | add_show_from_set (c, &showlist); | |
4041 | ||
4042 | set_follow_fork_mode_command ("parent", 0, NULL); | |
4043 | ||
4044 | c = add_set_enum_cmd ("scheduler-locking", class_run, | |
4045 | scheduler_enums, /* array of string names */ | |
4046 | (char *) &scheduler_mode, /* current mode */ | |
4047 | "Set mode for locking scheduler during execution.\n\ | |
4048 | off == no locking (threads may preempt at any time)\n\ | |
4049 | on == full locking (no thread except the current thread may run)\n\ | |
4050 | step == scheduler locked during every single-step operation.\n\ | |
4051 | In this mode, no other thread may run during a step command.\n\ | |
4052 | Other threads may run while stepping over a function call ('next').", | |
4053 | &setlist); | |
4054 | ||
4055 | c->function.sfunc = set_schedlock_func; /* traps on target vector */ | |
4056 | add_show_from_set (c, &showlist); | |
4057 | } |