Commit | Line | Data |
---|---|---|
3aa6856a | 1 | /* Target-struct-independent code to start (run) and stop an inferior process. |
101b7f9c PS |
2 | Copyright 1986, 1987, 1988, 1989, 1991, 1992, 1993 |
3 | Free Software Foundation, Inc. | |
bd5635a1 RP |
4 | |
5 | This file is part of GDB. | |
6 | ||
3b271cf4 | 7 | This program is free software; you can redistribute it and/or modify |
bd5635a1 | 8 | it under the terms of the GNU General Public License as published by |
3b271cf4 JG |
9 | the Free Software Foundation; either version 2 of the License, or |
10 | (at your option) any later version. | |
bd5635a1 | 11 | |
3b271cf4 | 12 | This program is distributed in the hope that it will be useful, |
bd5635a1 RP |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
3b271cf4 JG |
18 | along with this program; if not, write to the Free Software |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
bd5635a1 | 20 | |
bd5635a1 | 21 | #include "defs.h" |
d747e0af | 22 | #include <string.h> |
a6b98cb9 | 23 | #include <ctype.h> |
bd5635a1 RP |
24 | #include "symtab.h" |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "breakpoint.h" | |
28 | #include "wait.h" | |
29 | #include "gdbcore.h" | |
3950a34e | 30 | #include "gdbcmd.h" |
bd5635a1 | 31 | #include "target.h" |
100f92e2 | 32 | #include "thread.h" |
bd5635a1 RP |
33 | |
34 | #include <signal.h> | |
35 | ||
36 | /* unistd.h is needed to #define X_OK */ | |
37 | #ifdef USG | |
38 | #include <unistd.h> | |
39 | #else | |
40 | #include <sys/file.h> | |
41 | #endif | |
42 | ||
30875e1c | 43 | /* Prototypes for local functions */ |
bd5635a1 | 44 | |
30875e1c | 45 | static void |
e37a6e9c | 46 | signals_info PARAMS ((char *, int)); |
619fd145 | 47 | |
30875e1c SG |
48 | static void |
49 | handle_command PARAMS ((char *, int)); | |
50 | ||
51 | static void | |
52 | sig_print_info PARAMS ((int)); | |
53 | ||
54 | static void | |
55 | sig_print_header PARAMS ((void)); | |
56 | ||
30875e1c SG |
57 | static void |
58 | resume_cleanups PARAMS ((int)); | |
59 | ||
3950a34e RP |
60 | static int |
61 | hook_stop_stub PARAMS ((char *)); | |
62 | ||
30875e1c SG |
63 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
64 | program. It needs to examine the jmp_buf argument and extract the PC | |
65 | from it. The return value is non-zero on success, zero otherwise. */ | |
66 | #ifndef GET_LONGJMP_TARGET | |
67 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 | |
68 | #endif | |
69 | ||
d747e0af MT |
70 | |
71 | /* Some machines have trampoline code that sits between function callers | |
72 | and the actual functions themselves. If this machine doesn't have | |
73 | such things, disable their processing. */ | |
74 | #ifndef SKIP_TRAMPOLINE_CODE | |
75 | #define SKIP_TRAMPOLINE_CODE(pc) 0 | |
76 | #endif | |
77 | ||
1eeba686 PB |
78 | /* For SVR4 shared libraries, each call goes through a small piece of |
79 | trampoline code in the ".init" section. IN_SOLIB_TRAMPOLINE evaluates | |
80 | to nonzero if we are current stopped in one of these. */ | |
81 | #ifndef IN_SOLIB_TRAMPOLINE | |
82 | #define IN_SOLIB_TRAMPOLINE(pc,name) 0 | |
83 | #endif | |
d747e0af | 84 | |
9f739abd SG |
85 | /* On some systems, the PC may be left pointing at an instruction that won't |
86 | actually be executed. This is usually indicated by a bit in the PSW. If | |
87 | we find ourselves in such a state, then we step the target beyond the | |
88 | nullified instruction before returning control to the user so as to avoid | |
89 | confusion. */ | |
90 | ||
91 | #ifndef INSTRUCTION_NULLIFIED | |
92 | #define INSTRUCTION_NULLIFIED 0 | |
93 | #endif | |
94 | ||
bd5635a1 RP |
95 | /* Tables of how to react to signals; the user sets them. */ |
96 | ||
072b552a JG |
97 | static unsigned char *signal_stop; |
98 | static unsigned char *signal_print; | |
99 | static unsigned char *signal_program; | |
100 | ||
101 | #define SET_SIGS(nsigs,sigs,flags) \ | |
102 | do { \ | |
103 | int signum = (nsigs); \ | |
104 | while (signum-- > 0) \ | |
105 | if ((sigs)[signum]) \ | |
106 | (flags)[signum] = 1; \ | |
107 | } while (0) | |
108 | ||
109 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
110 | do { \ | |
111 | int signum = (nsigs); \ | |
112 | while (signum-- > 0) \ | |
113 | if ((sigs)[signum]) \ | |
114 | (flags)[signum] = 0; \ | |
115 | } while (0) | |
bd5635a1 | 116 | |
3950a34e RP |
117 | |
118 | /* Command list pointer for the "stop" placeholder. */ | |
119 | ||
120 | static struct cmd_list_element *stop_command; | |
121 | ||
bd5635a1 | 122 | /* Nonzero if breakpoints are now inserted in the inferior. */ |
bd5635a1 | 123 | |
3950a34e | 124 | static int breakpoints_inserted; |
bd5635a1 RP |
125 | |
126 | /* Function inferior was in as of last step command. */ | |
127 | ||
128 | static struct symbol *step_start_function; | |
129 | ||
bd5635a1 RP |
130 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ |
131 | ||
132 | static int trap_expected; | |
133 | ||
134 | /* Nonzero if the next time we try to continue the inferior, it will | |
135 | step one instruction and generate a spurious trace trap. | |
136 | This is used to compensate for a bug in HP-UX. */ | |
137 | ||
138 | static int trap_expected_after_continue; | |
139 | ||
140 | /* Nonzero means expecting a trace trap | |
141 | and should stop the inferior and return silently when it happens. */ | |
142 | ||
143 | int stop_after_trap; | |
144 | ||
145 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
146 | It is used after attach, due to attaching to a process; | |
147 | when running in the shell before the child program has been exec'd; | |
148 | and when running some kinds of remote stuff (FIXME?). */ | |
149 | ||
150 | int stop_soon_quietly; | |
151 | ||
bd5635a1 RP |
152 | /* Nonzero if proceed is being used for a "finish" command or a similar |
153 | situation when stop_registers should be saved. */ | |
154 | ||
155 | int proceed_to_finish; | |
156 | ||
157 | /* Save register contents here when about to pop a stack dummy frame, | |
158 | if-and-only-if proceed_to_finish is set. | |
159 | Thus this contains the return value from the called function (assuming | |
160 | values are returned in a register). */ | |
161 | ||
162 | char stop_registers[REGISTER_BYTES]; | |
163 | ||
164 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
165 | ||
166 | static int breakpoints_failed; | |
167 | ||
168 | /* Nonzero after stop if current stack frame should be printed. */ | |
169 | ||
170 | static int stop_print_frame; | |
171 | ||
172 | #ifdef NO_SINGLE_STEP | |
173 | extern int one_stepped; /* From machine dependent code */ | |
174 | extern void single_step (); /* Same. */ | |
175 | #endif /* NO_SINGLE_STEP */ | |
176 | ||
a71d17b1 JK |
177 | \f |
178 | /* Things to clean up if we QUIT out of resume (). */ | |
e1ce8aa5 | 179 | /* ARGSUSED */ |
a71d17b1 JK |
180 | static void |
181 | resume_cleanups (arg) | |
182 | int arg; | |
183 | { | |
184 | normal_stop (); | |
185 | } | |
186 | ||
187 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
188 | wants to interrupt some lengthy single-stepping operation | |
189 | (for child processes, the SIGINT goes to the inferior, and so | |
190 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
191 | other targets, that's not true). | |
192 | ||
193 | STEP nonzero if we should step (zero to continue instead). | |
194 | SIG is the signal to give the inferior (zero for none). */ | |
310cc570 | 195 | void |
a71d17b1 JK |
196 | resume (step, sig) |
197 | int step; | |
198 | int sig; | |
199 | { | |
200 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
201 | QUIT; | |
d11c44f1 | 202 | |
cef4c2e7 PS |
203 | #ifdef CANNOT_STEP_BREAKPOINT |
204 | /* Most targets can step a breakpoint instruction, thus executing it | |
205 | normally. But if this one cannot, just continue and we will hit | |
206 | it anyway. */ | |
207 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
208 | step = 0; | |
209 | #endif | |
210 | ||
d11c44f1 JG |
211 | #ifdef NO_SINGLE_STEP |
212 | if (step) { | |
818de002 | 213 | single_step(sig); /* Do it the hard way, w/temp breakpoints */ |
d11c44f1 JG |
214 | step = 0; /* ...and don't ask hardware to do it. */ |
215 | } | |
216 | #endif | |
217 | ||
bdbd5f50 JG |
218 | /* Handle any optimized stores to the inferior NOW... */ |
219 | #ifdef DO_DEFERRED_STORES | |
220 | DO_DEFERRED_STORES; | |
221 | #endif | |
222 | ||
2f1c7c3f JK |
223 | /* Install inferior's terminal modes. */ |
224 | target_terminal_inferior (); | |
225 | ||
de43d7d0 | 226 | target_resume (-1, step, sig); |
a71d17b1 JK |
227 | discard_cleanups (old_cleanups); |
228 | } | |
229 | ||
bd5635a1 RP |
230 | \f |
231 | /* Clear out all variables saying what to do when inferior is continued. | |
232 | First do this, then set the ones you want, then call `proceed'. */ | |
233 | ||
234 | void | |
235 | clear_proceed_status () | |
236 | { | |
237 | trap_expected = 0; | |
238 | step_range_start = 0; | |
239 | step_range_end = 0; | |
240 | step_frame_address = 0; | |
241 | step_over_calls = -1; | |
bd5635a1 RP |
242 | stop_after_trap = 0; |
243 | stop_soon_quietly = 0; | |
244 | proceed_to_finish = 0; | |
245 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
246 | ||
247 | /* Discard any remaining commands or status from previous stop. */ | |
248 | bpstat_clear (&stop_bpstat); | |
249 | } | |
250 | ||
251 | /* Basic routine for continuing the program in various fashions. | |
252 | ||
253 | ADDR is the address to resume at, or -1 for resume where stopped. | |
254 | SIGGNAL is the signal to give it, or 0 for none, | |
255 | or -1 for act according to how it stopped. | |
256 | STEP is nonzero if should trap after one instruction. | |
257 | -1 means return after that and print nothing. | |
258 | You should probably set various step_... variables | |
259 | before calling here, if you are stepping. | |
260 | ||
261 | You should call clear_proceed_status before calling proceed. */ | |
262 | ||
263 | void | |
264 | proceed (addr, siggnal, step) | |
265 | CORE_ADDR addr; | |
266 | int siggnal; | |
267 | int step; | |
268 | { | |
269 | int oneproc = 0; | |
270 | ||
271 | if (step > 0) | |
272 | step_start_function = find_pc_function (read_pc ()); | |
273 | if (step < 0) | |
274 | stop_after_trap = 1; | |
275 | ||
bdbd5f50 | 276 | if (addr == (CORE_ADDR)-1) |
bd5635a1 RP |
277 | { |
278 | /* If there is a breakpoint at the address we will resume at, | |
279 | step one instruction before inserting breakpoints | |
280 | so that we do not stop right away. */ | |
281 | ||
37c99ddb | 282 | if (breakpoint_here_p (read_pc ())) |
bd5635a1 RP |
283 | oneproc = 1; |
284 | } | |
285 | else | |
101b7f9c | 286 | write_pc (addr); |
bd5635a1 RP |
287 | |
288 | if (trap_expected_after_continue) | |
289 | { | |
290 | /* If (step == 0), a trap will be automatically generated after | |
291 | the first instruction is executed. Force step one | |
292 | instruction to clear this condition. This should not occur | |
293 | if step is nonzero, but it is harmless in that case. */ | |
294 | oneproc = 1; | |
295 | trap_expected_after_continue = 0; | |
296 | } | |
297 | ||
298 | if (oneproc) | |
299 | /* We will get a trace trap after one instruction. | |
300 | Continue it automatically and insert breakpoints then. */ | |
301 | trap_expected = 1; | |
302 | else | |
303 | { | |
304 | int temp = insert_breakpoints (); | |
305 | if (temp) | |
306 | { | |
307 | print_sys_errmsg ("ptrace", temp); | |
308 | error ("Cannot insert breakpoints.\n\ | |
309 | The same program may be running in another process."); | |
310 | } | |
311 | breakpoints_inserted = 1; | |
312 | } | |
313 | ||
bd5635a1 RP |
314 | if (siggnal >= 0) |
315 | stop_signal = siggnal; | |
316 | /* If this signal should not be seen by program, | |
317 | give it zero. Used for debugging signals. */ | |
318 | else if (stop_signal < NSIG && !signal_program[stop_signal]) | |
319 | stop_signal= 0; | |
320 | ||
bd5635a1 | 321 | /* Resume inferior. */ |
a71d17b1 | 322 | resume (oneproc || step || bpstat_should_step (), stop_signal); |
bd5635a1 RP |
323 | |
324 | /* Wait for it to stop (if not standalone) | |
325 | and in any case decode why it stopped, and act accordingly. */ | |
326 | ||
327 | wait_for_inferior (); | |
328 | normal_stop (); | |
329 | } | |
330 | ||
bd5635a1 RP |
331 | /* Record the pc and sp of the program the last time it stopped. |
332 | These are just used internally by wait_for_inferior, but need | |
333 | to be preserved over calls to it and cleared when the inferior | |
334 | is started. */ | |
335 | static CORE_ADDR prev_pc; | |
336 | static CORE_ADDR prev_sp; | |
337 | static CORE_ADDR prev_func_start; | |
b58a1973 | 338 | static CORE_ADDR prev_func_end; |
bd5635a1 RP |
339 | static char *prev_func_name; |
340 | ||
a71d17b1 | 341 | \f |
bd5635a1 RP |
342 | /* Start remote-debugging of a machine over a serial link. */ |
343 | ||
344 | void | |
345 | start_remote () | |
346 | { | |
347 | init_wait_for_inferior (); | |
348 | clear_proceed_status (); | |
349 | stop_soon_quietly = 1; | |
350 | trap_expected = 0; | |
98885d76 JK |
351 | wait_for_inferior (); |
352 | normal_stop (); | |
bd5635a1 RP |
353 | } |
354 | ||
355 | /* Initialize static vars when a new inferior begins. */ | |
356 | ||
357 | void | |
358 | init_wait_for_inferior () | |
359 | { | |
360 | /* These are meaningless until the first time through wait_for_inferior. */ | |
361 | prev_pc = 0; | |
362 | prev_sp = 0; | |
363 | prev_func_start = 0; | |
364 | prev_func_name = NULL; | |
365 | ||
366 | trap_expected_after_continue = 0; | |
367 | breakpoints_inserted = 0; | |
cf3e377e | 368 | breakpoint_init_inferior (); |
bd5635a1 RP |
369 | stop_signal = 0; /* Don't confuse first call to proceed(). */ |
370 | } | |
371 | ||
fe675038 JK |
372 | static void |
373 | delete_breakpoint_current_contents (arg) | |
374 | PTR arg; | |
375 | { | |
376 | struct breakpoint **breakpointp = (struct breakpoint **)arg; | |
377 | if (*breakpointp != NULL) | |
378 | delete_breakpoint (*breakpointp); | |
379 | } | |
bd5635a1 RP |
380 | \f |
381 | /* Wait for control to return from inferior to debugger. | |
382 | If inferior gets a signal, we may decide to start it up again | |
383 | instead of returning. That is why there is a loop in this function. | |
384 | When this function actually returns it means the inferior | |
385 | should be left stopped and GDB should read more commands. */ | |
386 | ||
387 | void | |
388 | wait_for_inferior () | |
389 | { | |
fe675038 | 390 | struct cleanup *old_cleanups; |
bd5635a1 RP |
391 | WAITTYPE w; |
392 | int another_trap; | |
393 | int random_signal; | |
37c99ddb | 394 | CORE_ADDR stop_sp = 0; |
bd5635a1 | 395 | CORE_ADDR stop_func_start; |
981a3309 | 396 | CORE_ADDR stop_func_end; |
bd5635a1 | 397 | char *stop_func_name; |
37c99ddb | 398 | CORE_ADDR prologue_pc = 0, tmp; |
bd5635a1 RP |
399 | struct symtab_and_line sal; |
400 | int remove_breakpoints_on_following_step = 0; | |
b3b39c0c | 401 | int current_line; |
30875e1c | 402 | int handling_longjmp = 0; /* FIXME */ |
fe675038 | 403 | struct breakpoint *step_resume_breakpoint = NULL; |
37c99ddb | 404 | int pid; |
bd5635a1 | 405 | |
fe675038 JK |
406 | old_cleanups = make_cleanup (delete_breakpoint_current_contents, |
407 | &step_resume_breakpoint); | |
b3b39c0c SG |
408 | sal = find_pc_line(prev_pc, 0); |
409 | current_line = sal.line; | |
410 | ||
cb6b0202 JK |
411 | /* Are we stepping? */ |
412 | #define CURRENTLY_STEPPING() ((step_resume_breakpoint == NULL \ | |
413 | && !handling_longjmp \ | |
414 | && (step_range_end \ | |
415 | || trap_expected)) \ | |
416 | || bpstat_should_step ()) | |
417 | ||
bd5635a1 RP |
418 | while (1) |
419 | { | |
420 | /* Clean up saved state that will become invalid. */ | |
bd5635a1 RP |
421 | flush_cached_frames (); |
422 | registers_changed (); | |
423 | ||
de43d7d0 | 424 | pid = target_wait (-1, &w); |
bd5635a1 | 425 | |
1eeba686 PB |
426 | #ifdef SIGTRAP_STOP_AFTER_LOAD |
427 | ||
428 | /* Somebody called load(2), and it gave us a "trap signal after load". | |
429 | Ignore it gracefully. */ | |
430 | ||
431 | SIGTRAP_STOP_AFTER_LOAD (w); | |
432 | #endif | |
433 | ||
bd5635a1 RP |
434 | /* See if the process still exists; clean up if it doesn't. */ |
435 | if (WIFEXITED (w)) | |
436 | { | |
437 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
438 | if (WEXITSTATUS (w)) | |
e37a6e9c | 439 | printf_filtered ("\nProgram exited with code 0%o.\n", |
bd5635a1 RP |
440 | (unsigned int)WEXITSTATUS (w)); |
441 | else | |
442 | if (!batch_mode()) | |
e37a6e9c | 443 | printf_filtered ("\nProgram exited normally.\n"); |
bd5635a1 RP |
444 | fflush (stdout); |
445 | target_mourn_inferior (); | |
446 | #ifdef NO_SINGLE_STEP | |
447 | one_stepped = 0; | |
448 | #endif | |
449 | stop_print_frame = 0; | |
450 | break; | |
451 | } | |
452 | else if (!WIFSTOPPED (w)) | |
453 | { | |
fee44494 JK |
454 | char *signame; |
455 | ||
bd5635a1 RP |
456 | stop_print_frame = 0; |
457 | stop_signal = WTERMSIG (w); | |
458 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
30875e1c | 459 | target_kill (); /* kill mourns as well */ |
bd5635a1 | 460 | #ifdef PRINT_RANDOM_SIGNAL |
e37a6e9c | 461 | printf_filtered ("\nProgram terminated: "); |
bd5635a1 RP |
462 | PRINT_RANDOM_SIGNAL (stop_signal); |
463 | #else | |
fee44494 JK |
464 | printf_filtered ("\nProgram terminated with signal "); |
465 | signame = strsigno (stop_signal); | |
466 | if (signame == NULL) | |
467 | printf_filtered ("%d", stop_signal); | |
468 | else | |
469 | /* Do we need to print the number in addition to the name? */ | |
470 | printf_filtered ("%s (%d)", signame, stop_signal); | |
471 | printf_filtered (", %s\n", safe_strsignal (stop_signal)); | |
bd5635a1 | 472 | #endif |
fee44494 | 473 | printf_filtered ("The program no longer exists.\n"); |
bd5635a1 RP |
474 | fflush (stdout); |
475 | #ifdef NO_SINGLE_STEP | |
476 | one_stepped = 0; | |
477 | #endif | |
478 | break; | |
479 | } | |
de43d7d0 SG |
480 | |
481 | stop_signal = WSTOPSIG (w); | |
482 | ||
483 | if (pid != inferior_pid) | |
484 | { | |
485 | int save_pid = inferior_pid; | |
486 | ||
487 | inferior_pid = pid; /* Setup for target memory/regs */ | |
488 | registers_changed (); | |
489 | stop_pc = read_pc (); | |
490 | inferior_pid = save_pid; | |
491 | registers_changed (); | |
492 | } | |
493 | else | |
494 | stop_pc = read_pc (); | |
495 | ||
496 | if (stop_signal == SIGTRAP | |
497 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
498 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, pid)) | |
499 | { | |
500 | /* Saw a breakpoint, but it was hit by the wrong thread. Just continue. */ | |
501 | if (breakpoints_inserted) | |
502 | { | |
503 | remove_breakpoints (); | |
504 | target_resume (pid, 1, 0); /* Single step */ | |
749e538b | 505 | /* FIXME: What if a signal arrives instead of the single-step |
18122d8b | 506 | happening? */ |
de43d7d0 SG |
507 | target_wait (pid, NULL); |
508 | insert_breakpoints (); | |
509 | } | |
510 | target_resume (-1, 0, 0); | |
511 | continue; | |
512 | } | |
513 | else | |
514 | if (pid != inferior_pid) | |
515 | goto switch_thread; | |
516 | ||
37c99ddb JK |
517 | if (pid != inferior_pid) |
518 | { | |
519 | int printed = 0; | |
520 | ||
521 | if (!in_thread_list (pid)) | |
522 | { | |
523 | fprintf (stderr, "[New %s]\n", target_pid_to_str (pid)); | |
524 | add_thread (pid); | |
525 | ||
de43d7d0 | 526 | target_resume (-1, 0, 0); |
37c99ddb JK |
527 | continue; |
528 | } | |
529 | else | |
530 | { | |
37c99ddb JK |
531 | if (stop_signal >= NSIG || signal_print[stop_signal]) |
532 | { | |
533 | char *signame; | |
534 | ||
535 | printed = 1; | |
536 | target_terminal_ours_for_output (); | |
537 | printf_filtered ("\nProgram received signal "); | |
538 | signame = strsigno (stop_signal); | |
539 | if (signame == NULL) | |
540 | printf_filtered ("%d", stop_signal); | |
541 | else | |
542 | printf_filtered ("%s (%d)", signame, stop_signal); | |
543 | printf_filtered (", %s\n", safe_strsignal (stop_signal)); | |
544 | ||
545 | fflush (stdout); | |
546 | } | |
547 | ||
de43d7d0 SG |
548 | if (stop_signal == SIGTRAP |
549 | || stop_signal >= NSIG | |
550 | || signal_stop[stop_signal]) | |
37c99ddb | 551 | { |
de43d7d0 | 552 | switch_thread: |
37c99ddb JK |
553 | inferior_pid = pid; |
554 | printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid)); | |
555 | ||
556 | flush_cached_frames (); | |
557 | registers_changed (); | |
558 | trap_expected = 0; | |
559 | if (step_resume_breakpoint) | |
560 | { | |
561 | delete_breakpoint (step_resume_breakpoint); | |
562 | step_resume_breakpoint = NULL; | |
563 | } | |
564 | prev_pc = 0; | |
565 | prev_sp = 0; | |
566 | prev_func_name = NULL; | |
567 | step_range_start = 0; | |
568 | step_range_end = 0; | |
569 | step_frame_address = 0; | |
570 | handling_longjmp = 0; | |
571 | another_trap = 0; | |
572 | } | |
573 | else | |
574 | { | |
575 | if (printed) | |
576 | target_terminal_inferior (); | |
577 | ||
578 | /* Clear the signal if it should not be passed. */ | |
579 | if (signal_program[stop_signal] == 0) | |
580 | stop_signal = 0; | |
581 | ||
de43d7d0 | 582 | target_resume (-1, 0, stop_signal); |
37c99ddb JK |
583 | continue; |
584 | } | |
585 | } | |
586 | } | |
587 | ||
bd5635a1 RP |
588 | #ifdef NO_SINGLE_STEP |
589 | if (one_stepped) | |
590 | single_step (0); /* This actually cleans up the ss */ | |
591 | #endif /* NO_SINGLE_STEP */ | |
592 | ||
9f739abd SG |
593 | /* If PC is pointing at a nullified instruction, then step beyond it so that |
594 | the user won't be confused when GDB appears to be ready to execute it. */ | |
595 | ||
596 | if (INSTRUCTION_NULLIFIED) | |
597 | { | |
598 | resume (1, 0); | |
599 | continue; | |
600 | } | |
601 | ||
37c99ddb | 602 | set_current_frame ( create_new_frame (read_fp (), stop_pc)); |
fe675038 | 603 | |
bd5635a1 | 604 | stop_frame_address = FRAME_FP (get_current_frame ()); |
fee44494 | 605 | stop_sp = read_sp (); |
bd5635a1 | 606 | stop_func_start = 0; |
981a3309 | 607 | stop_func_end = 0; |
bd5635a1 RP |
608 | stop_func_name = 0; |
609 | /* Don't care about return value; stop_func_start and stop_func_name | |
610 | will both be 0 if it doesn't work. */ | |
37c99ddb | 611 | find_pc_partial_function (stop_pc, &stop_func_name, &stop_func_start, |
981a3309 | 612 | &stop_func_end); |
bd5635a1 RP |
613 | stop_func_start += FUNCTION_START_OFFSET; |
614 | another_trap = 0; | |
615 | bpstat_clear (&stop_bpstat); | |
616 | stop_step = 0; | |
617 | stop_stack_dummy = 0; | |
618 | stop_print_frame = 1; | |
bd5635a1 RP |
619 | random_signal = 0; |
620 | stopped_by_random_signal = 0; | |
621 | breakpoints_failed = 0; | |
622 | ||
623 | /* Look at the cause of the stop, and decide what to do. | |
624 | The alternatives are: | |
625 | 1) break; to really stop and return to the debugger, | |
626 | 2) drop through to start up again | |
627 | (set another_trap to 1 to single step once) | |
628 | 3) set random_signal to 1, and the decision between 1 and 2 | |
629 | will be made according to the signal handling tables. */ | |
630 | ||
bd5635a1 RP |
631 | /* First, distinguish signals caused by the debugger from signals |
632 | that have to do with the program's own actions. | |
633 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
634 | or SIGEMT, depending on the operating system version. | |
635 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
636 | and change it to SIGTRAP. */ | |
637 | ||
638 | if (stop_signal == SIGTRAP | |
639 | || (breakpoints_inserted && | |
640 | (stop_signal == SIGILL | |
e37a6e9c PB |
641 | #ifdef SIGEMT |
642 | || stop_signal == SIGEMT | |
643 | #endif | |
644 | )) | |
bd5635a1 RP |
645 | || stop_soon_quietly) |
646 | { | |
647 | if (stop_signal == SIGTRAP && stop_after_trap) | |
648 | { | |
649 | stop_print_frame = 0; | |
650 | break; | |
651 | } | |
652 | if (stop_soon_quietly) | |
653 | break; | |
654 | ||
655 | /* Don't even think about breakpoints | |
656 | if just proceeded over a breakpoint. | |
657 | ||
658 | However, if we are trying to proceed over a breakpoint | |
fe675038 | 659 | and end up in sigtramp, then step_resume_breakpoint |
bd5635a1 RP |
660 | will be set and we should check whether we've hit the |
661 | step breakpoint. */ | |
662 | if (stop_signal == SIGTRAP && trap_expected | |
fe675038 | 663 | && step_resume_breakpoint == NULL) |
bd5635a1 RP |
664 | bpstat_clear (&stop_bpstat); |
665 | else | |
666 | { | |
667 | /* See if there is a breakpoint at the current PC. */ | |
cb6b0202 JK |
668 | stop_bpstat = bpstat_stop_status |
669 | (&stop_pc, stop_frame_address, | |
bd5635a1 | 670 | #if DECR_PC_AFTER_BREAK |
cb6b0202 JK |
671 | /* Notice the case of stepping through a jump |
672 | that lands just after a breakpoint. | |
673 | Don't confuse that with hitting the breakpoint. | |
674 | What we check for is that 1) stepping is going on | |
675 | and 2) the pc before the last insn does not match | |
676 | the address of the breakpoint before the current pc. */ | |
677 | (prev_pc != stop_pc - DECR_PC_AFTER_BREAK | |
678 | && CURRENTLY_STEPPING ()) | |
679 | #else /* DECR_PC_AFTER_BREAK zero */ | |
680 | 0 | |
681 | #endif /* DECR_PC_AFTER_BREAK zero */ | |
682 | ); | |
683 | /* Following in case break condition called a | |
684 | function. */ | |
685 | stop_print_frame = 1; | |
bd5635a1 | 686 | } |
fe675038 | 687 | |
bd5635a1 RP |
688 | if (stop_signal == SIGTRAP) |
689 | random_signal | |
690 | = !(bpstat_explains_signal (stop_bpstat) | |
691 | || trap_expected | |
84d59861 | 692 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
bd5635a1 | 693 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) |
84d59861 | 694 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
fe675038 | 695 | || (step_range_end && step_resume_breakpoint == NULL)); |
bd5635a1 RP |
696 | else |
697 | { | |
698 | random_signal | |
699 | = !(bpstat_explains_signal (stop_bpstat) | |
bd5635a1 RP |
700 | /* End of a stack dummy. Some systems (e.g. Sony |
701 | news) give another signal besides SIGTRAP, | |
702 | so check here as well as above. */ | |
84d59861 | 703 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
d747e0af | 704 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) |
84d59861 | 705 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
bd5635a1 RP |
706 | ); |
707 | if (!random_signal) | |
708 | stop_signal = SIGTRAP; | |
709 | } | |
710 | } | |
711 | else | |
712 | random_signal = 1; | |
fe675038 | 713 | |
bd5635a1 RP |
714 | /* For the program's own signals, act according to |
715 | the signal handling tables. */ | |
fe675038 | 716 | |
bd5635a1 RP |
717 | if (random_signal) |
718 | { | |
719 | /* Signal not for debugging purposes. */ | |
720 | int printed = 0; | |
721 | ||
722 | stopped_by_random_signal = 1; | |
723 | ||
724 | if (stop_signal >= NSIG | |
725 | || signal_print[stop_signal]) | |
726 | { | |
fee44494 | 727 | char *signame; |
bd5635a1 RP |
728 | printed = 1; |
729 | target_terminal_ours_for_output (); | |
730 | #ifdef PRINT_RANDOM_SIGNAL | |
731 | PRINT_RANDOM_SIGNAL (stop_signal); | |
732 | #else | |
fee44494 JK |
733 | printf_filtered ("\nProgram received signal "); |
734 | signame = strsigno (stop_signal); | |
735 | if (signame == NULL) | |
736 | printf_filtered ("%d", stop_signal); | |
737 | else | |
738 | /* Do we need to print the number as well as the name? */ | |
739 | printf_filtered ("%s (%d)", signame, stop_signal); | |
740 | printf_filtered (", %s\n", safe_strsignal (stop_signal)); | |
bd5635a1 RP |
741 | #endif /* PRINT_RANDOM_SIGNAL */ |
742 | fflush (stdout); | |
743 | } | |
744 | if (stop_signal >= NSIG | |
745 | || signal_stop[stop_signal]) | |
746 | break; | |
747 | /* If not going to stop, give terminal back | |
748 | if we took it away. */ | |
749 | else if (printed) | |
750 | target_terminal_inferior (); | |
b7f81b57 | 751 | |
101b7f9c PS |
752 | /* Clear the signal if it should not be passed. */ |
753 | if (signal_program[stop_signal] == 0) | |
754 | stop_signal = 0; | |
755 | ||
fe675038 JK |
756 | /* I'm not sure whether this needs to be check_sigtramp2 or |
757 | whether it could/should be keep_going. */ | |
758 | goto check_sigtramp2; | |
bd5635a1 | 759 | } |
30875e1c | 760 | |
bd5635a1 | 761 | /* Handle cases caused by hitting a breakpoint. */ |
fe675038 JK |
762 | { |
763 | CORE_ADDR jmp_buf_pc; | |
29c6dce2 JK |
764 | struct bpstat_what what; |
765 | ||
766 | what = bpstat_what (stop_bpstat); | |
bd5635a1 | 767 | |
84d59861 JK |
768 | if (what.call_dummy) |
769 | { | |
770 | stop_stack_dummy = 1; | |
771 | #ifdef HP_OS_BUG | |
772 | trap_expected_after_continue = 1; | |
773 | #endif | |
774 | } | |
775 | ||
fe675038 JK |
776 | switch (what.main_action) |
777 | { | |
778 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
779 | /* If we hit the breakpoint at longjmp, disable it for the | |
780 | duration of this command. Then, install a temporary | |
781 | breakpoint at the target of the jmp_buf. */ | |
782 | disable_longjmp_breakpoint(); | |
783 | remove_breakpoints (); | |
784 | breakpoints_inserted = 0; | |
785 | if (!GET_LONGJMP_TARGET(&jmp_buf_pc)) goto keep_going; | |
786 | ||
787 | /* Need to blow away step-resume breakpoint, as it | |
788 | interferes with us */ | |
789 | if (step_resume_breakpoint != NULL) | |
790 | { | |
791 | delete_breakpoint (step_resume_breakpoint); | |
792 | step_resume_breakpoint = NULL; | |
793 | what.step_resume = 0; | |
794 | } | |
30875e1c | 795 | |
101b7f9c | 796 | #if 0 |
fe675038 JK |
797 | /* FIXME - Need to implement nested temporary breakpoints */ |
798 | if (step_over_calls > 0) | |
799 | set_longjmp_resume_breakpoint(jmp_buf_pc, | |
800 | get_current_frame()); | |
801 | else | |
30875e1c | 802 | #endif /* 0 */ |
fe675038 JK |
803 | set_longjmp_resume_breakpoint(jmp_buf_pc, NULL); |
804 | handling_longjmp = 1; /* FIXME */ | |
805 | goto keep_going; | |
806 | ||
807 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: | |
808 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
809 | remove_breakpoints (); | |
810 | breakpoints_inserted = 0; | |
101b7f9c | 811 | #if 0 |
fe675038 JK |
812 | /* FIXME - Need to implement nested temporary breakpoints */ |
813 | if (step_over_calls | |
814 | && (stop_frame_address | |
815 | INNER_THAN step_frame_address)) | |
816 | { | |
817 | another_trap = 1; | |
818 | goto keep_going; | |
819 | } | |
30875e1c | 820 | #endif /* 0 */ |
fe675038 JK |
821 | disable_longjmp_breakpoint(); |
822 | handling_longjmp = 0; /* FIXME */ | |
823 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
101b7f9c | 824 | break; |
fe675038 JK |
825 | /* else fallthrough */ |
826 | ||
827 | case BPSTAT_WHAT_SINGLE: | |
828 | if (breakpoints_inserted) | |
829 | remove_breakpoints (); | |
830 | breakpoints_inserted = 0; | |
831 | another_trap = 1; | |
832 | /* Still need to check other stuff, at least the case | |
833 | where we are stepping and step out of the right range. */ | |
834 | break; | |
835 | ||
836 | case BPSTAT_WHAT_STOP_NOISY: | |
837 | stop_print_frame = 1; | |
838 | /* We are about to nuke the step_resume_breakpoint via the | |
839 | cleanup chain, so no need to worry about it here. */ | |
840 | goto stop_stepping; | |
101b7f9c | 841 | |
fe675038 JK |
842 | case BPSTAT_WHAT_STOP_SILENT: |
843 | stop_print_frame = 0; | |
844 | /* We are about to nuke the step_resume_breakpoint via the | |
845 | cleanup chain, so no need to worry about it here. */ | |
846 | goto stop_stepping; | |
847 | ||
100f92e2 JK |
848 | case BPSTAT_WHAT_LAST: |
849 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
850 | ||
fe675038 JK |
851 | case BPSTAT_WHAT_KEEP_CHECKING: |
852 | break; | |
853 | } | |
854 | ||
855 | if (what.step_resume) | |
30875e1c | 856 | { |
fe675038 JK |
857 | delete_breakpoint (step_resume_breakpoint); |
858 | step_resume_breakpoint = NULL; | |
30875e1c | 859 | |
fe675038 JK |
860 | /* If were waiting for a trap, hitting the step_resume_break |
861 | doesn't count as getting it. */ | |
862 | if (trap_expected) | |
863 | another_trap = 1; | |
30875e1c | 864 | } |
fe675038 | 865 | } |
30875e1c SG |
866 | |
867 | /* We come here if we hit a breakpoint but should not | |
868 | stop for it. Possibly we also were stepping | |
869 | and should stop for that. So fall through and | |
870 | test for stepping. But, if not stepping, | |
871 | do not stop. */ | |
872 | ||
84d59861 JK |
873 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
874 | /* This is the old way of detecting the end of the stack dummy. | |
875 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
876 | handled above. As soon as we can test it on all of them, all | |
877 | architectures should define it. */ | |
878 | ||
bd5635a1 | 879 | /* If this is the breakpoint at the end of a stack dummy, |
c9de302b SG |
880 | just stop silently, unless the user was doing an si/ni, in which |
881 | case she'd better know what she's doing. */ | |
882 | ||
883 | if (PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) | |
884 | && !step_range_end) | |
885 | { | |
886 | stop_print_frame = 0; | |
887 | stop_stack_dummy = 1; | |
bd5635a1 | 888 | #ifdef HP_OS_BUG |
c9de302b | 889 | trap_expected_after_continue = 1; |
bd5635a1 | 890 | #endif |
c9de302b SG |
891 | break; |
892 | } | |
84d59861 JK |
893 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
894 | ||
fe675038 | 895 | if (step_resume_breakpoint) |
bd5635a1 RP |
896 | /* Having a step-resume breakpoint overrides anything |
897 | else having to do with stepping commands until | |
898 | that breakpoint is reached. */ | |
fe675038 JK |
899 | /* I suspect this could/should be keep_going, because if the |
900 | check_sigtramp2 check succeeds, then it will put in another | |
901 | step_resume_breakpoint, and we aren't (yet) prepared to nest | |
902 | them. */ | |
903 | goto check_sigtramp2; | |
904 | ||
905 | if (step_range_end == 0) | |
906 | /* Likewise if we aren't even stepping. */ | |
907 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
908 | whether it could/should be keep_going. */ | |
909 | goto check_sigtramp2; | |
910 | ||
bd5635a1 | 911 | /* If stepping through a line, keep going if still within it. */ |
fe675038 JK |
912 | if (stop_pc >= step_range_start |
913 | && stop_pc < step_range_end | |
914 | /* The step range might include the start of the | |
915 | function, so if we are at the start of the | |
916 | step range and either the stack or frame pointers | |
917 | just changed, we've stepped outside */ | |
918 | && !(stop_pc == step_range_start | |
919 | && stop_frame_address | |
920 | && (stop_sp INNER_THAN prev_sp | |
921 | || stop_frame_address != step_frame_address))) | |
bd5635a1 | 922 | { |
fe675038 JK |
923 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. |
924 | So definately need to check for sigtramp here. */ | |
925 | goto check_sigtramp2; | |
bd5635a1 | 926 | } |
fe675038 | 927 | |
bd5635a1 RP |
928 | /* We stepped out of the stepping range. See if that was due |
929 | to a subroutine call that we should proceed to the end of. */ | |
fe675038 JK |
930 | |
931 | /* Did we just take a signal? */ | |
932 | if (IN_SIGTRAMP (stop_pc, stop_func_name) | |
933 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) | |
bd5635a1 | 934 | { |
fe675038 JK |
935 | /* This code is needed at least in the following case: |
936 | The user types "next" and then a signal arrives (before | |
937 | the "next" is done). */ | |
938 | /* We've just taken a signal; go until we are back to | |
939 | the point where we took it and one more. */ | |
940 | { | |
941 | struct symtab_and_line sr_sal; | |
942 | ||
943 | sr_sal.pc = prev_pc; | |
944 | sr_sal.symtab = NULL; | |
945 | sr_sal.line = 0; | |
946 | step_resume_breakpoint = | |
947 | set_momentary_breakpoint (sr_sal, get_current_frame (), | |
948 | bp_step_resume); | |
949 | if (breakpoints_inserted) | |
950 | insert_breakpoints (); | |
951 | } | |
bd5635a1 | 952 | |
fe675038 JK |
953 | /* If this is stepi or nexti, make sure that the stepping range |
954 | gets us past that instruction. */ | |
955 | if (step_range_end == 1) | |
956 | /* FIXME: Does this run afoul of the code below which, if | |
957 | we step into the middle of a line, resets the stepping | |
958 | range? */ | |
959 | step_range_end = (step_range_start = prev_pc) + 1; | |
101b7f9c | 960 | |
fe675038 JK |
961 | remove_breakpoints_on_following_step = 1; |
962 | goto keep_going; | |
963 | } | |
30875e1c | 964 | |
fe675038 JK |
965 | if (stop_func_start) |
966 | { | |
967 | /* Do this after the IN_SIGTRAMP check; it might give | |
968 | an error. */ | |
969 | prologue_pc = stop_func_start; | |
970 | SKIP_PROLOGUE (prologue_pc); | |
971 | } | |
30875e1c | 972 | |
c0c14c1e JK |
973 | if ((/* Might be a non-recursive call. If the symbols are missing |
974 | enough that stop_func_start == prev_func_start even though | |
975 | they are really two functions, we will treat some calls as | |
976 | jumps. */ | |
977 | stop_func_start != prev_func_start | |
978 | ||
979 | /* Might be a recursive call if either we have a prologue | |
980 | or the call instruction itself saves the PC on the stack. */ | |
981 | || prologue_pc != stop_func_start | |
982 | || stop_sp != prev_sp) | |
b58a1973 SG |
983 | && (/* PC is out of bounds of the current function. Note that this |
984 | seems sorta redundant w.r.t the prior test of stop_func_start | |
985 | != prev_func_start... */ | |
986 | stop_pc < prev_func_start | |
987 | || stop_pc >= prev_func_end | |
c0c14c1e JK |
988 | |
989 | /* If we do a call, we will be at the start of a function. */ | |
990 | || stop_pc == stop_func_start | |
991 | ||
992 | #if 0 | |
993 | /* Not conservative enough for 4.11. FIXME: enable this | |
994 | after 4.11. */ | |
995 | /* Except on the Alpha with -O (and perhaps other machines | |
996 | with similar calling conventions), in which we might | |
997 | call the address after the load of gp. Since prologues | |
998 | don't contain calls, we can't return to within one, and | |
999 | we don't jump back into them, so this check is OK. */ | |
1000 | || stop_pc < prologue_pc | |
1001 | #endif | |
d747e0af | 1002 | |
c0c14c1e JK |
1003 | /* If we end up in certain places, it means we did a subroutine |
1004 | call. I'm not completely sure this is necessary now that we | |
1005 | have the above checks with stop_func_start (and now that | |
100f92e2 | 1006 | find_pc_partial_function is pickier). */ |
c0c14c1e JK |
1007 | || IN_SOLIB_TRAMPOLINE (stop_pc, stop_func_name) |
1008 | ||
1009 | /* If none of the above apply, it is a jump within a function, | |
1010 | or a return from a subroutine. The other case is longjmp, | |
1011 | which can no longer happen here as long as the | |
1012 | handling_longjmp stuff is working. */ | |
1013 | )) | |
fe675038 JK |
1014 | { |
1015 | /* It's a subroutine call. */ | |
fee44494 | 1016 | |
fe675038 JK |
1017 | if (step_over_calls == 0) |
1018 | { | |
1019 | /* I presume that step_over_calls is only 0 when we're | |
1020 | supposed to be stepping at the assembly language level | |
1021 | ("stepi"). Just stop. */ | |
1022 | stop_step = 1; | |
1023 | break; | |
1024 | } | |
fee44494 | 1025 | |
fe675038 JK |
1026 | if (step_over_calls > 0) |
1027 | /* We're doing a "next". */ | |
1028 | goto step_over_function; | |
1029 | ||
1030 | /* If we are in a function call trampoline (a stub between | |
1031 | the calling routine and the real function), locate the real | |
1032 | function. That's what tells us (a) whether we want to step | |
1033 | into it at all, and (b) what prologue we want to run to | |
1034 | the end of, if we do step into it. */ | |
1035 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
1036 | if (tmp != 0) | |
1037 | stop_func_start = tmp; | |
1038 | ||
1039 | /* If we have line number information for the function we | |
1040 | are thinking of stepping into, step into it. | |
1041 | ||
1042 | If there are several symtabs at that PC (e.g. with include | |
1043 | files), just want to know whether *any* of them have line | |
1044 | numbers. find_pc_line handles this. */ | |
1045 | { | |
1046 | struct symtab_and_line tmp_sal; | |
1047 | ||
1048 | tmp_sal = find_pc_line (stop_func_start, 0); | |
1049 | if (tmp_sal.line != 0) | |
1050 | goto step_into_function; | |
1051 | } | |
d747e0af MT |
1052 | |
1053 | step_over_function: | |
fe675038 JK |
1054 | /* A subroutine call has happened. */ |
1055 | { | |
1056 | /* Set a special breakpoint after the return */ | |
1057 | struct symtab_and_line sr_sal; | |
1058 | sr_sal.pc = | |
1059 | ADDR_BITS_REMOVE | |
1060 | (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
1061 | sr_sal.symtab = NULL; | |
1062 | sr_sal.line = 0; | |
1063 | step_resume_breakpoint = | |
1064 | set_momentary_breakpoint (sr_sal, get_current_frame (), | |
1065 | bp_step_resume); | |
1066 | if (breakpoints_inserted) | |
1067 | insert_breakpoints (); | |
1068 | } | |
1069 | goto keep_going; | |
d747e0af MT |
1070 | |
1071 | step_into_function: | |
fe675038 JK |
1072 | /* Subroutine call with source code we should not step over. |
1073 | Do step to the first line of code in it. */ | |
1074 | SKIP_PROLOGUE (stop_func_start); | |
1075 | sal = find_pc_line (stop_func_start, 0); | |
1076 | /* Use the step_resume_break to step until | |
1077 | the end of the prologue, even if that involves jumps | |
1078 | (as it seems to on the vax under 4.2). */ | |
1079 | /* If the prologue ends in the middle of a source line, | |
1080 | continue to the end of that source line. | |
1081 | Otherwise, just go to end of prologue. */ | |
bd5635a1 | 1082 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP |
fe675038 JK |
1083 | /* no, don't either. It skips any code that's |
1084 | legitimately on the first line. */ | |
bd5635a1 | 1085 | #else |
fe675038 JK |
1086 | if (sal.end && sal.pc != stop_func_start) |
1087 | stop_func_start = sal.end; | |
bd5635a1 | 1088 | #endif |
d747e0af | 1089 | |
fe675038 JK |
1090 | if (stop_func_start == stop_pc) |
1091 | { | |
1092 | /* We are already there: stop now. */ | |
1093 | stop_step = 1; | |
1094 | break; | |
1095 | } | |
1096 | else | |
1097 | /* Put the step-breakpoint there and go until there. */ | |
1098 | { | |
1099 | struct symtab_and_line sr_sal; | |
1100 | ||
1101 | sr_sal.pc = stop_func_start; | |
1102 | sr_sal.symtab = NULL; | |
1103 | sr_sal.line = 0; | |
1104 | /* Do not specify what the fp should be when we stop | |
1105 | since on some machines the prologue | |
1106 | is where the new fp value is established. */ | |
1107 | step_resume_breakpoint = | |
84d59861 | 1108 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); |
fe675038 JK |
1109 | if (breakpoints_inserted) |
1110 | insert_breakpoints (); | |
1111 | ||
1112 | /* And make sure stepping stops right away then. */ | |
1113 | step_range_end = step_range_start; | |
bd5635a1 | 1114 | } |
fe675038 JK |
1115 | goto keep_going; |
1116 | } | |
d747e0af | 1117 | |
fe675038 JK |
1118 | /* We've wandered out of the step range (but haven't done a |
1119 | subroutine call or return). (Is that true? I think we get | |
1120 | here if we did a return and maybe a longjmp). */ | |
d747e0af | 1121 | |
fe675038 JK |
1122 | sal = find_pc_line(stop_pc, 0); |
1123 | ||
1124 | if (step_range_end == 1) | |
1125 | { | |
1126 | /* It is stepi or nexti. We always want to stop stepping after | |
1127 | one instruction. */ | |
1128 | stop_step = 1; | |
1129 | break; | |
1130 | } | |
1131 | ||
1132 | if (sal.line == 0) | |
1133 | { | |
1134 | /* We have no line number information. That means to stop | |
1135 | stepping (does this always happen right after one instruction, | |
1136 | when we do "s" in a function with no line numbers, | |
1137 | or can this happen as a result of a return or longjmp?). */ | |
1138 | stop_step = 1; | |
1139 | break; | |
1140 | } | |
1141 | ||
1142 | if (stop_pc == sal.pc && current_line != sal.line) | |
1143 | { | |
1144 | /* We are at the start of a different line. So stop. Note that | |
1145 | we don't stop if we step into the middle of a different line. | |
1146 | That is said to make things like for (;;) statements work | |
1147 | better. */ | |
1148 | stop_step = 1; | |
1149 | break; | |
bd5635a1 RP |
1150 | } |
1151 | ||
fe675038 JK |
1152 | /* We aren't done stepping. |
1153 | ||
1154 | Optimize by setting the stepping range to the line. | |
1155 | (We might not be in the original line, but if we entered a | |
1156 | new line in mid-statement, we continue stepping. This makes | |
1157 | things like for(;;) statements work better.) */ | |
1158 | step_range_start = sal.pc; | |
1159 | step_range_end = sal.end; | |
1160 | goto keep_going; | |
1161 | ||
1162 | check_sigtramp2: | |
d747e0af MT |
1163 | if (trap_expected |
1164 | && IN_SIGTRAMP (stop_pc, stop_func_name) | |
1165 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) | |
bd5635a1 RP |
1166 | { |
1167 | /* What has happened here is that we have just stepped the inferior | |
1168 | with a signal (because it is a signal which shouldn't make | |
1169 | us stop), thus stepping into sigtramp. | |
1170 | ||
1171 | So we need to set a step_resume_break_address breakpoint | |
fe675038 JK |
1172 | and continue until we hit it, and then step. FIXME: This should |
1173 | be more enduring than a step_resume breakpoint; we should know | |
1174 | that we will later need to keep going rather than re-hitting | |
1175 | the breakpoint here (see testsuite/gdb.t06/signals.exp where | |
1176 | it says "exceedingly difficult"). */ | |
1177 | struct symtab_and_line sr_sal; | |
1178 | ||
1179 | sr_sal.pc = prev_pc; | |
1180 | sr_sal.symtab = NULL; | |
1181 | sr_sal.line = 0; | |
1182 | step_resume_breakpoint = | |
1183 | set_momentary_breakpoint (sr_sal, get_current_frame (), | |
1184 | bp_step_resume); | |
bd5635a1 | 1185 | if (breakpoints_inserted) |
fe675038 JK |
1186 | insert_breakpoints (); |
1187 | ||
bd5635a1 RP |
1188 | remove_breakpoints_on_following_step = 1; |
1189 | another_trap = 1; | |
1190 | } | |
1191 | ||
30875e1c | 1192 | keep_going: |
fe675038 JK |
1193 | /* Come to this label when you need to resume the inferior. |
1194 | It's really much cleaner to do a goto than a maze of if-else | |
1195 | conditions. */ | |
30875e1c | 1196 | |
bd5635a1 RP |
1197 | /* Save the pc before execution, to compare with pc after stop. */ |
1198 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
1199 | prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER | |
1200 | BREAK is defined, the | |
1201 | original pc would not have | |
1202 | been at the start of a | |
1203 | function. */ | |
b58a1973 | 1204 | prev_func_end = stop_func_end; |
bd5635a1 RP |
1205 | prev_func_name = stop_func_name; |
1206 | prev_sp = stop_sp; | |
1207 | ||
1208 | /* If we did not do break;, it means we should keep | |
1209 | running the inferior and not return to debugger. */ | |
1210 | ||
1211 | if (trap_expected && stop_signal != SIGTRAP) | |
1212 | { | |
1213 | /* We took a signal (which we are supposed to pass through to | |
1214 | the inferior, else we'd have done a break above) and we | |
1215 | haven't yet gotten our trap. Simply continue. */ | |
cb6b0202 | 1216 | resume (CURRENTLY_STEPPING (), stop_signal); |
bd5635a1 RP |
1217 | } |
1218 | else | |
1219 | { | |
1220 | /* Either the trap was not expected, but we are continuing | |
1221 | anyway (the user asked that this signal be passed to the | |
1222 | child) | |
1223 | -- or -- | |
1224 | The signal was SIGTRAP, e.g. it was our signal, but we | |
1225 | decided we should resume from it. | |
1226 | ||
1227 | We're going to run this baby now! | |
1228 | ||
1229 | Insert breakpoints now, unless we are trying | |
1230 | to one-proceed past a breakpoint. */ | |
1231 | /* If we've just finished a special step resume and we don't | |
1232 | want to hit a breakpoint, pull em out. */ | |
fe675038 | 1233 | if (step_resume_breakpoint == NULL && |
bd5635a1 RP |
1234 | remove_breakpoints_on_following_step) |
1235 | { | |
1236 | remove_breakpoints_on_following_step = 0; | |
1237 | remove_breakpoints (); | |
1238 | breakpoints_inserted = 0; | |
1239 | } | |
1240 | else if (!breakpoints_inserted && | |
fe675038 | 1241 | (step_resume_breakpoint != NULL || !another_trap)) |
bd5635a1 | 1242 | { |
bd5635a1 RP |
1243 | breakpoints_failed = insert_breakpoints (); |
1244 | if (breakpoints_failed) | |
1245 | break; | |
1246 | breakpoints_inserted = 1; | |
1247 | } | |
1248 | ||
1249 | trap_expected = another_trap; | |
1250 | ||
1251 | if (stop_signal == SIGTRAP) | |
1252 | stop_signal = 0; | |
1253 | ||
1254 | #ifdef SHIFT_INST_REGS | |
1255 | /* I'm not sure when this following segment applies. I do know, now, | |
1256 | that we shouldn't rewrite the regs when we were stopped by a | |
1257 | random signal from the inferior process. */ | |
cef4c2e7 PS |
1258 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? |
1259 | (this is only used on the 88k). */ | |
bd5635a1 | 1260 | |
d11c44f1 JG |
1261 | if (!bpstat_explains_signal (stop_bpstat) |
1262 | && (stop_signal != SIGCLD) | |
bd5635a1 | 1263 | && !stopped_by_random_signal) |
07a5991a | 1264 | SHIFT_INST_REGS(); |
bd5635a1 RP |
1265 | #endif /* SHIFT_INST_REGS */ |
1266 | ||
cb6b0202 | 1267 | resume (CURRENTLY_STEPPING (), stop_signal); |
bd5635a1 RP |
1268 | } |
1269 | } | |
30875e1c SG |
1270 | |
1271 | stop_stepping: | |
bd5635a1 RP |
1272 | if (target_has_execution) |
1273 | { | |
1274 | /* Assuming the inferior still exists, set these up for next | |
1275 | time, just like we did above if we didn't break out of the | |
1276 | loop. */ | |
1277 | prev_pc = read_pc (); | |
1278 | prev_func_start = stop_func_start; | |
b58a1973 | 1279 | prev_func_end = stop_func_end; |
bd5635a1 RP |
1280 | prev_func_name = stop_func_name; |
1281 | prev_sp = stop_sp; | |
1282 | } | |
fe675038 | 1283 | do_cleanups (old_cleanups); |
bd5635a1 RP |
1284 | } |
1285 | \f | |
1286 | /* Here to return control to GDB when the inferior stops for real. | |
1287 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
1288 | ||
1289 | STOP_PRINT_FRAME nonzero means print the executing frame | |
1290 | (pc, function, args, file, line number and line text). | |
1291 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
1292 | attempting to insert breakpoints. */ | |
1293 | ||
1294 | void | |
1295 | normal_stop () | |
1296 | { | |
1297 | /* Make sure that the current_frame's pc is correct. This | |
1298 | is a correction for setting up the frame info before doing | |
1299 | DECR_PC_AFTER_BREAK */ | |
3f0184ac | 1300 | if (target_has_execution && get_current_frame()) |
bd5635a1 RP |
1301 | (get_current_frame ())->pc = read_pc (); |
1302 | ||
1303 | if (breakpoints_failed) | |
1304 | { | |
1305 | target_terminal_ours_for_output (); | |
1306 | print_sys_errmsg ("ptrace", breakpoints_failed); | |
e37a6e9c | 1307 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
bd5635a1 RP |
1308 | The same program may be running in another process.\n"); |
1309 | } | |
1310 | ||
bd5635a1 RP |
1311 | if (target_has_execution && breakpoints_inserted) |
1312 | if (remove_breakpoints ()) | |
1313 | { | |
1314 | target_terminal_ours_for_output (); | |
e37a6e9c | 1315 | printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\ |
bd5635a1 RP |
1316 | It might be running in another process.\n\ |
1317 | Further execution is probably impossible.\n"); | |
1318 | } | |
1319 | ||
1320 | breakpoints_inserted = 0; | |
1321 | ||
1322 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
1323 | Delete any breakpoint that is to be deleted at the next stop. */ | |
1324 | ||
1325 | breakpoint_auto_delete (stop_bpstat); | |
1326 | ||
1327 | /* If an auto-display called a function and that got a signal, | |
1328 | delete that auto-display to avoid an infinite recursion. */ | |
1329 | ||
1330 | if (stopped_by_random_signal) | |
1331 | disable_current_display (); | |
1332 | ||
1333 | if (step_multi && stop_step) | |
1334 | return; | |
1335 | ||
1336 | target_terminal_ours (); | |
1337 | ||
3950a34e RP |
1338 | /* Look up the hook_stop and run it if it exists. */ |
1339 | ||
1340 | if (stop_command->hook) | |
1341 | { | |
1342 | catch_errors (hook_stop_stub, (char *)stop_command->hook, | |
fee44494 | 1343 | "Error while running hook_stop:\n", RETURN_MASK_ALL); |
3950a34e RP |
1344 | } |
1345 | ||
bd5635a1 RP |
1346 | if (!target_has_stack) |
1347 | return; | |
1348 | ||
1349 | /* Select innermost stack frame except on return from a stack dummy routine, | |
1515ff18 JG |
1350 | or if the program has exited. Print it without a level number if |
1351 | we have changed functions or hit a breakpoint. Print source line | |
1352 | if we have one. */ | |
bd5635a1 RP |
1353 | if (!stop_stack_dummy) |
1354 | { | |
1355 | select_frame (get_current_frame (), 0); | |
1356 | ||
1357 | if (stop_print_frame) | |
1358 | { | |
1515ff18 JG |
1359 | int source_only; |
1360 | ||
1361 | source_only = bpstat_print (stop_bpstat); | |
1362 | source_only = source_only || | |
1363 | ( stop_step | |
bd5635a1 | 1364 | && step_frame_address == stop_frame_address |
1515ff18 JG |
1365 | && step_start_function == find_pc_function (stop_pc)); |
1366 | ||
1367 | print_stack_frame (selected_frame, -1, source_only? -1: 1); | |
bd5635a1 RP |
1368 | |
1369 | /* Display the auto-display expressions. */ | |
1370 | do_displays (); | |
1371 | } | |
1372 | } | |
1373 | ||
1374 | /* Save the function value return registers, if we care. | |
1375 | We might be about to restore their previous contents. */ | |
1376 | if (proceed_to_finish) | |
1377 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
1378 | ||
1379 | if (stop_stack_dummy) | |
1380 | { | |
1381 | /* Pop the empty frame that contains the stack dummy. | |
1382 | POP_FRAME ends with a setting of the current frame, so we | |
1383 | can use that next. */ | |
1384 | POP_FRAME; | |
1385 | select_frame (get_current_frame (), 0); | |
1386 | } | |
1387 | } | |
3950a34e RP |
1388 | |
1389 | static int | |
1390 | hook_stop_stub (cmd) | |
1391 | char *cmd; | |
1392 | { | |
1393 | execute_user_command ((struct cmd_list_element *)cmd, 0); | |
a8a69e63 | 1394 | return (0); |
3950a34e | 1395 | } |
bd5635a1 | 1396 | \f |
cc221e76 FF |
1397 | int signal_stop_state (signo) |
1398 | int signo; | |
1399 | { | |
1400 | return ((signo >= 0 && signo < NSIG) ? signal_stop[signo] : 0); | |
1401 | } | |
1402 | ||
1403 | int signal_print_state (signo) | |
1404 | int signo; | |
1405 | { | |
1406 | return ((signo >= 0 && signo < NSIG) ? signal_print[signo] : 0); | |
1407 | } | |
1408 | ||
1409 | int signal_pass_state (signo) | |
1410 | int signo; | |
1411 | { | |
1412 | return ((signo >= 0 && signo < NSIG) ? signal_program[signo] : 0); | |
1413 | } | |
1414 | ||
bd5635a1 RP |
1415 | static void |
1416 | sig_print_header () | |
1417 | { | |
1418 | printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n"); | |
1419 | } | |
1420 | ||
1421 | static void | |
1422 | sig_print_info (number) | |
1423 | int number; | |
1424 | { | |
e37a6e9c PB |
1425 | char *name; |
1426 | ||
1427 | if ((name = strsigno (number)) == NULL) | |
bd5635a1 RP |
1428 | printf_filtered ("%d\t\t", number); |
1429 | else | |
e37a6e9c | 1430 | printf_filtered ("%s (%d)\t", name, number); |
bd5635a1 RP |
1431 | printf_filtered ("%s\t", signal_stop[number] ? "Yes" : "No"); |
1432 | printf_filtered ("%s\t", signal_print[number] ? "Yes" : "No"); | |
1433 | printf_filtered ("%s\t\t", signal_program[number] ? "Yes" : "No"); | |
e37a6e9c | 1434 | printf_filtered ("%s\n", safe_strsignal (number)); |
bd5635a1 RP |
1435 | } |
1436 | ||
1437 | /* Specify how various signals in the inferior should be handled. */ | |
1438 | ||
1439 | static void | |
1440 | handle_command (args, from_tty) | |
1441 | char *args; | |
1442 | int from_tty; | |
1443 | { | |
072b552a JG |
1444 | char **argv; |
1445 | int digits, wordlen; | |
1446 | int sigfirst, signum, siglast; | |
1447 | int allsigs; | |
1448 | int nsigs; | |
1449 | unsigned char *sigs; | |
1450 | struct cleanup *old_chain; | |
1451 | ||
1452 | if (args == NULL) | |
1453 | { | |
1454 | error_no_arg ("signal to handle"); | |
1455 | } | |
bd5635a1 | 1456 | |
072b552a JG |
1457 | /* Allocate and zero an array of flags for which signals to handle. */ |
1458 | ||
1459 | nsigs = signo_max () + 1; | |
1460 | sigs = (unsigned char *) alloca (nsigs); | |
1461 | memset (sigs, 0, nsigs); | |
bd5635a1 | 1462 | |
072b552a JG |
1463 | /* Break the command line up into args. */ |
1464 | ||
1465 | argv = buildargv (args); | |
1466 | if (argv == NULL) | |
bd5635a1 | 1467 | { |
072b552a JG |
1468 | nomem (0); |
1469 | } | |
1470 | old_chain = make_cleanup (freeargv, (char *) argv); | |
bd5635a1 | 1471 | |
072b552a JG |
1472 | /* Walk through the args, looking for signal numbers, signal names, and |
1473 | actions. Signal numbers and signal names may be interspersed with | |
1474 | actions, with the actions being performed for all signals cumulatively | |
1475 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
bd5635a1 | 1476 | |
072b552a JG |
1477 | while (*argv != NULL) |
1478 | { | |
1479 | wordlen = strlen (*argv); | |
1480 | for (digits = 0; isdigit ((*argv)[digits]); digits++) {;} | |
1481 | allsigs = 0; | |
1482 | sigfirst = siglast = -1; | |
1483 | ||
1484 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
1485 | { | |
1486 | /* Apply action to all signals except those used by the | |
1487 | debugger. Silently skip those. */ | |
1488 | allsigs = 1; | |
1489 | sigfirst = 0; | |
1490 | siglast = nsigs - 1; | |
1491 | } | |
1492 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
1493 | { | |
1494 | SET_SIGS (nsigs, sigs, signal_stop); | |
1495 | SET_SIGS (nsigs, sigs, signal_print); | |
1496 | } | |
1497 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
1498 | { | |
1499 | UNSET_SIGS (nsigs, sigs, signal_program); | |
1500 | } | |
1501 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
1502 | { | |
1503 | SET_SIGS (nsigs, sigs, signal_print); | |
1504 | } | |
1505 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
1506 | { | |
1507 | SET_SIGS (nsigs, sigs, signal_program); | |
1508 | } | |
1509 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
1510 | { | |
1511 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
1512 | } | |
1513 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
1514 | { | |
1515 | SET_SIGS (nsigs, sigs, signal_program); | |
1516 | } | |
1517 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
1518 | { | |
1519 | UNSET_SIGS (nsigs, sigs, signal_print); | |
1520 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
1521 | } | |
1522 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
1523 | { | |
1524 | UNSET_SIGS (nsigs, sigs, signal_program); | |
1525 | } | |
1526 | else if (digits > 0) | |
bd5635a1 | 1527 | { |
072b552a JG |
1528 | sigfirst = siglast = atoi (*argv); |
1529 | if ((*argv)[digits] == '-') | |
bd5635a1 | 1530 | { |
072b552a | 1531 | siglast = atoi ((*argv) + digits + 1); |
bd5635a1 | 1532 | } |
072b552a | 1533 | if (sigfirst > siglast) |
bd5635a1 | 1534 | { |
072b552a JG |
1535 | /* Bet he didn't figure we'd think of this case... */ |
1536 | signum = sigfirst; | |
1537 | sigfirst = siglast; | |
1538 | siglast = signum; | |
bd5635a1 | 1539 | } |
072b552a JG |
1540 | if (sigfirst < 0 || sigfirst >= nsigs) |
1541 | { | |
1542 | error ("Signal %d not in range 0-%d", sigfirst, nsigs - 1); | |
1543 | } | |
1544 | if (siglast < 0 || siglast >= nsigs) | |
bd5635a1 | 1545 | { |
072b552a | 1546 | error ("Signal %d not in range 0-%d", siglast, nsigs - 1); |
bd5635a1 RP |
1547 | } |
1548 | } | |
072b552a | 1549 | else if ((signum = strtosigno (*argv)) != 0) |
bd5635a1 | 1550 | { |
072b552a | 1551 | sigfirst = siglast = signum; |
bd5635a1 | 1552 | } |
072b552a | 1553 | else |
bd5635a1 | 1554 | { |
072b552a JG |
1555 | /* Not a number and not a recognized flag word => complain. */ |
1556 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
bd5635a1 | 1557 | } |
072b552a JG |
1558 | |
1559 | /* If any signal numbers or symbol names were found, set flags for | |
1560 | which signals to apply actions to. */ | |
1561 | ||
1562 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
bd5635a1 | 1563 | { |
072b552a JG |
1564 | switch (signum) |
1565 | { | |
1566 | case SIGTRAP: | |
1567 | case SIGINT: | |
1568 | if (!allsigs && !sigs[signum]) | |
1569 | { | |
1570 | if (query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum))) | |
1571 | { | |
1572 | sigs[signum] = 1; | |
1573 | } | |
1574 | else | |
1575 | { | |
1576 | printf ("Not confirmed, unchanged.\n"); | |
1577 | fflush (stdout); | |
1578 | } | |
1579 | } | |
1580 | break; | |
1581 | default: | |
1582 | sigs[signum] = 1; | |
1583 | break; | |
1584 | } | |
bd5635a1 RP |
1585 | } |
1586 | ||
072b552a | 1587 | argv++; |
bd5635a1 RP |
1588 | } |
1589 | ||
de43d7d0 | 1590 | target_notice_signals(inferior_pid); |
cc221e76 | 1591 | |
bd5635a1 RP |
1592 | if (from_tty) |
1593 | { | |
1594 | /* Show the results. */ | |
1595 | sig_print_header (); | |
072b552a JG |
1596 | for (signum = 0; signum < nsigs; signum++) |
1597 | { | |
1598 | if (sigs[signum]) | |
1599 | { | |
1600 | sig_print_info (signum); | |
1601 | } | |
1602 | } | |
bd5635a1 | 1603 | } |
072b552a JG |
1604 | |
1605 | do_cleanups (old_chain); | |
bd5635a1 RP |
1606 | } |
1607 | ||
1608 | /* Print current contents of the tables set by the handle command. */ | |
1609 | ||
1610 | static void | |
e37a6e9c | 1611 | signals_info (signum_exp, from_tty) |
bd5635a1 | 1612 | char *signum_exp; |
e37a6e9c | 1613 | int from_tty; |
bd5635a1 RP |
1614 | { |
1615 | register int i; | |
1616 | sig_print_header (); | |
1617 | ||
1618 | if (signum_exp) | |
1619 | { | |
1620 | /* First see if this is a symbol name. */ | |
e37a6e9c PB |
1621 | i = strtosigno (signum_exp); |
1622 | if (i == 0) | |
bd5635a1 RP |
1623 | { |
1624 | /* Nope, maybe it's an address which evaluates to a signal | |
1625 | number. */ | |
1626 | i = parse_and_eval_address (signum_exp); | |
1627 | if (i >= NSIG || i < 0) | |
1628 | error ("Signal number out of bounds."); | |
1629 | } | |
1630 | sig_print_info (i); | |
1631 | return; | |
1632 | } | |
1633 | ||
1634 | printf_filtered ("\n"); | |
1635 | for (i = 0; i < NSIG; i++) | |
1636 | { | |
1637 | QUIT; | |
1638 | ||
1639 | sig_print_info (i); | |
1640 | } | |
1641 | ||
1642 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
1643 | } | |
1644 | \f | |
1645 | /* Save all of the information associated with the inferior<==>gdb | |
1646 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
1647 | (defined in inferior.h). */ | |
1648 | ||
1649 | void | |
1650 | save_inferior_status (inf_status, restore_stack_info) | |
1651 | struct inferior_status *inf_status; | |
1652 | int restore_stack_info; | |
1653 | { | |
bd5635a1 RP |
1654 | inf_status->stop_signal = stop_signal; |
1655 | inf_status->stop_pc = stop_pc; | |
1656 | inf_status->stop_frame_address = stop_frame_address; | |
1657 | inf_status->stop_step = stop_step; | |
1658 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
1659 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
1660 | inf_status->trap_expected = trap_expected; | |
1661 | inf_status->step_range_start = step_range_start; | |
1662 | inf_status->step_range_end = step_range_end; | |
1663 | inf_status->step_frame_address = step_frame_address; | |
1664 | inf_status->step_over_calls = step_over_calls; | |
bd5635a1 RP |
1665 | inf_status->stop_after_trap = stop_after_trap; |
1666 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
1667 | /* Save original bpstat chain here; replace it with copy of chain. | |
1668 | If caller's caller is walking the chain, they'll be happier if we | |
1669 | hand them back the original chain when restore_i_s is called. */ | |
1670 | inf_status->stop_bpstat = stop_bpstat; | |
1671 | stop_bpstat = bpstat_copy (stop_bpstat); | |
1672 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
1673 | inf_status->restore_stack_info = restore_stack_info; | |
1674 | inf_status->proceed_to_finish = proceed_to_finish; | |
1675 | ||
072b552a | 1676 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
37c99ddb JK |
1677 | |
1678 | read_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
1679 | ||
bd5635a1 RP |
1680 | record_selected_frame (&(inf_status->selected_frame_address), |
1681 | &(inf_status->selected_level)); | |
1682 | return; | |
1683 | } | |
1684 | ||
37c99ddb JK |
1685 | struct restore_selected_frame_args { |
1686 | FRAME_ADDR frame_address; | |
1687 | int level; | |
1688 | }; | |
1689 | ||
1690 | static int restore_selected_frame PARAMS ((char *)); | |
1691 | ||
1692 | /* Restore the selected frame. args is really a struct | |
1693 | restore_selected_frame_args * (declared as char * for catch_errors) | |
1694 | telling us what frame to restore. Returns 1 for success, or 0 for | |
1695 | failure. An error message will have been printed on error. */ | |
1696 | static int | |
1697 | restore_selected_frame (args) | |
1698 | char *args; | |
1699 | { | |
1700 | struct restore_selected_frame_args *fr = | |
1701 | (struct restore_selected_frame_args *) args; | |
1702 | FRAME fid; | |
1703 | int level = fr->level; | |
1704 | ||
1705 | fid = find_relative_frame (get_current_frame (), &level); | |
1706 | ||
1707 | /* If inf_status->selected_frame_address is NULL, there was no | |
1708 | previously selected frame. */ | |
1709 | if (fid == 0 || | |
1710 | FRAME_FP (fid) != fr->frame_address || | |
1711 | level != 0) | |
1712 | { | |
1713 | warning ("Unable to restore previously selected frame.\n"); | |
1714 | return 0; | |
1715 | } | |
1716 | select_frame (fid, fr->level); | |
1717 | return(1); | |
1718 | } | |
1719 | ||
bd5635a1 RP |
1720 | void |
1721 | restore_inferior_status (inf_status) | |
1722 | struct inferior_status *inf_status; | |
1723 | { | |
bd5635a1 RP |
1724 | stop_signal = inf_status->stop_signal; |
1725 | stop_pc = inf_status->stop_pc; | |
1726 | stop_frame_address = inf_status->stop_frame_address; | |
1727 | stop_step = inf_status->stop_step; | |
1728 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
1729 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
1730 | trap_expected = inf_status->trap_expected; | |
1731 | step_range_start = inf_status->step_range_start; | |
1732 | step_range_end = inf_status->step_range_end; | |
1733 | step_frame_address = inf_status->step_frame_address; | |
1734 | step_over_calls = inf_status->step_over_calls; | |
bd5635a1 RP |
1735 | stop_after_trap = inf_status->stop_after_trap; |
1736 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
1737 | bpstat_clear (&stop_bpstat); | |
1738 | stop_bpstat = inf_status->stop_bpstat; | |
1739 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
1740 | proceed_to_finish = inf_status->proceed_to_finish; | |
1741 | ||
072b552a | 1742 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
bd5635a1 RP |
1743 | |
1744 | /* The inferior can be gone if the user types "print exit(0)" | |
1745 | (and perhaps other times). */ | |
37c99ddb JK |
1746 | if (target_has_execution) |
1747 | write_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
1748 | ||
1749 | /* The inferior can be gone if the user types "print exit(0)" | |
1750 | (and perhaps other times). */ | |
1751 | ||
1752 | /* FIXME: If we are being called after stopping in a function which | |
1753 | is called from gdb, we should not be trying to restore the | |
1754 | selected frame; it just prints a spurious error message (The | |
1755 | message is useful, however, in detecting bugs in gdb (like if gdb | |
1756 | clobbers the stack)). In fact, should we be restoring the | |
1757 | inferior status at all in that case? . */ | |
1758 | ||
bd5635a1 RP |
1759 | if (target_has_stack && inf_status->restore_stack_info) |
1760 | { | |
37c99ddb JK |
1761 | struct restore_selected_frame_args fr; |
1762 | fr.level = inf_status->selected_level; | |
1763 | fr.frame_address = inf_status->selected_frame_address; | |
1764 | /* The point of catch_errors is that if the stack is clobbered, | |
1765 | walking the stack might encounter a garbage pointer and error() | |
1766 | trying to dereference it. */ | |
1767 | if (catch_errors (restore_selected_frame, &fr, | |
1768 | "Unable to restore previously selected frame:\n", | |
1769 | RETURN_MASK_ERROR) == 0) | |
1770 | /* Error in restoring the selected frame. Select the innermost | |
1771 | frame. */ | |
1772 | select_frame (get_current_frame (), 0); | |
bd5635a1 RP |
1773 | } |
1774 | } | |
1775 | ||
1776 | \f | |
1777 | void | |
1778 | _initialize_infrun () | |
1779 | { | |
1780 | register int i; | |
e37a6e9c | 1781 | register int numsigs; |
bd5635a1 RP |
1782 | |
1783 | add_info ("signals", signals_info, | |
1784 | "What debugger does when program gets various signals.\n\ | |
1785 | Specify a signal number as argument to print info on that signal only."); | |
6b50c5c2 | 1786 | add_info_alias ("handle", "signals", 0); |
bd5635a1 RP |
1787 | |
1788 | add_com ("handle", class_run, handle_command, | |
1789 | "Specify how to handle a signal.\n\ | |
072b552a JG |
1790 | Args are signal numbers and actions to apply to those signals.\n\ |
1791 | Signal numbers may be numeric (ex. 11) or symbolic (ex. SIGSEGV).\n\ | |
1792 | Numeric ranges may be specified with the form LOW-HIGH (ex. 14-21).\n\ | |
1793 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1794 | used by the debugger, typically SIGTRAP and SIGINT.\n\ | |
1795 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
1796 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ | |
bd5635a1 | 1797 | Stop means reenter debugger if this signal happens (implies print).\n\ |
072b552a | 1798 | Print means print a message if this signal happens.\n\ |
bd5635a1 | 1799 | Pass means let program see this signal; otherwise program doesn't know.\n\ |
072b552a | 1800 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
bd5635a1 RP |
1801 | Pass and Stop may be combined."); |
1802 | ||
a8a69e63 | 1803 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, |
3950a34e RP |
1804 | "There is no `stop' command, but you can set a hook on `stop'.\n\ |
1805 | This allows you to set a list of commands to be run each time execution\n\ | |
fee44494 | 1806 | of the program stops.", &cmdlist); |
3950a34e | 1807 | |
e37a6e9c | 1808 | numsigs = signo_max () + 1; |
072b552a JG |
1809 | signal_stop = (unsigned char *) |
1810 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
1811 | signal_print = (unsigned char *) | |
1812 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
1813 | signal_program = (unsigned char *) | |
1814 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
e37a6e9c | 1815 | for (i = 0; i < numsigs; i++) |
bd5635a1 RP |
1816 | { |
1817 | signal_stop[i] = 1; | |
1818 | signal_print[i] = 1; | |
1819 | signal_program[i] = 1; | |
1820 | } | |
1821 | ||
1822 | /* Signals caused by debugger's own actions | |
1823 | should not be given to the program afterwards. */ | |
1824 | signal_program[SIGTRAP] = 0; | |
1825 | signal_program[SIGINT] = 0; | |
1826 | ||
1827 | /* Signals that are not errors should not normally enter the debugger. */ | |
1828 | #ifdef SIGALRM | |
1829 | signal_stop[SIGALRM] = 0; | |
1830 | signal_print[SIGALRM] = 0; | |
1831 | #endif /* SIGALRM */ | |
1832 | #ifdef SIGVTALRM | |
1833 | signal_stop[SIGVTALRM] = 0; | |
1834 | signal_print[SIGVTALRM] = 0; | |
1835 | #endif /* SIGVTALRM */ | |
1836 | #ifdef SIGPROF | |
1837 | signal_stop[SIGPROF] = 0; | |
1838 | signal_print[SIGPROF] = 0; | |
1839 | #endif /* SIGPROF */ | |
1840 | #ifdef SIGCHLD | |
1841 | signal_stop[SIGCHLD] = 0; | |
1842 | signal_print[SIGCHLD] = 0; | |
1843 | #endif /* SIGCHLD */ | |
1844 | #ifdef SIGCLD | |
1845 | signal_stop[SIGCLD] = 0; | |
1846 | signal_print[SIGCLD] = 0; | |
1847 | #endif /* SIGCLD */ | |
1848 | #ifdef SIGIO | |
1849 | signal_stop[SIGIO] = 0; | |
1850 | signal_print[SIGIO] = 0; | |
1851 | #endif /* SIGIO */ | |
1852 | #ifdef SIGURG | |
1853 | signal_stop[SIGURG] = 0; | |
1854 | signal_print[SIGURG] = 0; | |
1855 | #endif /* SIGURG */ | |
1856 | } |