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; | |
338 | static char *prev_func_name; | |
339 | ||
a71d17b1 | 340 | \f |
bd5635a1 RP |
341 | /* Start remote-debugging of a machine over a serial link. */ |
342 | ||
343 | void | |
344 | start_remote () | |
345 | { | |
346 | init_wait_for_inferior (); | |
347 | clear_proceed_status (); | |
348 | stop_soon_quietly = 1; | |
349 | trap_expected = 0; | |
98885d76 JK |
350 | wait_for_inferior (); |
351 | normal_stop (); | |
bd5635a1 RP |
352 | } |
353 | ||
354 | /* Initialize static vars when a new inferior begins. */ | |
355 | ||
356 | void | |
357 | init_wait_for_inferior () | |
358 | { | |
359 | /* These are meaningless until the first time through wait_for_inferior. */ | |
360 | prev_pc = 0; | |
361 | prev_sp = 0; | |
362 | prev_func_start = 0; | |
363 | prev_func_name = NULL; | |
364 | ||
365 | trap_expected_after_continue = 0; | |
366 | breakpoints_inserted = 0; | |
cf3e377e | 367 | breakpoint_init_inferior (); |
bd5635a1 RP |
368 | stop_signal = 0; /* Don't confuse first call to proceed(). */ |
369 | } | |
370 | ||
fe675038 JK |
371 | static void |
372 | delete_breakpoint_current_contents (arg) | |
373 | PTR arg; | |
374 | { | |
375 | struct breakpoint **breakpointp = (struct breakpoint **)arg; | |
376 | if (*breakpointp != NULL) | |
377 | delete_breakpoint (*breakpointp); | |
378 | } | |
bd5635a1 RP |
379 | \f |
380 | /* Wait for control to return from inferior to debugger. | |
381 | If inferior gets a signal, we may decide to start it up again | |
382 | instead of returning. That is why there is a loop in this function. | |
383 | When this function actually returns it means the inferior | |
384 | should be left stopped and GDB should read more commands. */ | |
385 | ||
386 | void | |
387 | wait_for_inferior () | |
388 | { | |
fe675038 | 389 | struct cleanup *old_cleanups; |
bd5635a1 RP |
390 | WAITTYPE w; |
391 | int another_trap; | |
392 | int random_signal; | |
37c99ddb | 393 | CORE_ADDR stop_sp = 0; |
bd5635a1 RP |
394 | CORE_ADDR stop_func_start; |
395 | char *stop_func_name; | |
37c99ddb | 396 | CORE_ADDR prologue_pc = 0, tmp; |
bd5635a1 RP |
397 | struct symtab_and_line sal; |
398 | int remove_breakpoints_on_following_step = 0; | |
b3b39c0c | 399 | int current_line; |
30875e1c | 400 | int handling_longjmp = 0; /* FIXME */ |
fe675038 | 401 | struct breakpoint *step_resume_breakpoint = NULL; |
37c99ddb | 402 | int pid; |
bd5635a1 | 403 | |
fe675038 JK |
404 | old_cleanups = make_cleanup (delete_breakpoint_current_contents, |
405 | &step_resume_breakpoint); | |
b3b39c0c SG |
406 | sal = find_pc_line(prev_pc, 0); |
407 | current_line = sal.line; | |
408 | ||
cb6b0202 JK |
409 | /* Are we stepping? */ |
410 | #define CURRENTLY_STEPPING() ((step_resume_breakpoint == NULL \ | |
411 | && !handling_longjmp \ | |
412 | && (step_range_end \ | |
413 | || trap_expected)) \ | |
414 | || bpstat_should_step ()) | |
415 | ||
bd5635a1 RP |
416 | while (1) |
417 | { | |
418 | /* Clean up saved state that will become invalid. */ | |
bd5635a1 RP |
419 | flush_cached_frames (); |
420 | registers_changed (); | |
421 | ||
de43d7d0 | 422 | pid = target_wait (-1, &w); |
bd5635a1 | 423 | |
1eeba686 PB |
424 | #ifdef SIGTRAP_STOP_AFTER_LOAD |
425 | ||
426 | /* Somebody called load(2), and it gave us a "trap signal after load". | |
427 | Ignore it gracefully. */ | |
428 | ||
429 | SIGTRAP_STOP_AFTER_LOAD (w); | |
430 | #endif | |
431 | ||
bd5635a1 RP |
432 | /* See if the process still exists; clean up if it doesn't. */ |
433 | if (WIFEXITED (w)) | |
434 | { | |
435 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
436 | if (WEXITSTATUS (w)) | |
e37a6e9c | 437 | printf_filtered ("\nProgram exited with code 0%o.\n", |
bd5635a1 RP |
438 | (unsigned int)WEXITSTATUS (w)); |
439 | else | |
440 | if (!batch_mode()) | |
e37a6e9c | 441 | printf_filtered ("\nProgram exited normally.\n"); |
199b2450 | 442 | gdb_flush (gdb_stdout); |
bd5635a1 RP |
443 | target_mourn_inferior (); |
444 | #ifdef NO_SINGLE_STEP | |
445 | one_stepped = 0; | |
446 | #endif | |
447 | stop_print_frame = 0; | |
448 | break; | |
449 | } | |
450 | else if (!WIFSTOPPED (w)) | |
451 | { | |
fee44494 JK |
452 | char *signame; |
453 | ||
bd5635a1 RP |
454 | stop_print_frame = 0; |
455 | stop_signal = WTERMSIG (w); | |
456 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
30875e1c | 457 | target_kill (); /* kill mourns as well */ |
bd5635a1 | 458 | #ifdef PRINT_RANDOM_SIGNAL |
e37a6e9c | 459 | printf_filtered ("\nProgram terminated: "); |
bd5635a1 RP |
460 | PRINT_RANDOM_SIGNAL (stop_signal); |
461 | #else | |
fee44494 JK |
462 | printf_filtered ("\nProgram terminated with signal "); |
463 | signame = strsigno (stop_signal); | |
464 | if (signame == NULL) | |
465 | printf_filtered ("%d", stop_signal); | |
466 | else | |
467 | /* Do we need to print the number in addition to the name? */ | |
468 | printf_filtered ("%s (%d)", signame, stop_signal); | |
469 | printf_filtered (", %s\n", safe_strsignal (stop_signal)); | |
bd5635a1 | 470 | #endif |
fee44494 | 471 | printf_filtered ("The program no longer exists.\n"); |
199b2450 | 472 | gdb_flush (gdb_stdout); |
bd5635a1 RP |
473 | #ifdef NO_SINGLE_STEP |
474 | one_stepped = 0; | |
475 | #endif | |
476 | break; | |
477 | } | |
de43d7d0 SG |
478 | |
479 | stop_signal = WSTOPSIG (w); | |
480 | ||
481 | if (pid != inferior_pid) | |
482 | { | |
483 | int save_pid = inferior_pid; | |
484 | ||
485 | inferior_pid = pid; /* Setup for target memory/regs */ | |
486 | registers_changed (); | |
487 | stop_pc = read_pc (); | |
488 | inferior_pid = save_pid; | |
489 | registers_changed (); | |
490 | } | |
491 | else | |
492 | stop_pc = read_pc (); | |
493 | ||
494 | if (stop_signal == SIGTRAP | |
495 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
496 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, pid)) | |
497 | { | |
498 | /* Saw a breakpoint, but it was hit by the wrong thread. Just continue. */ | |
499 | if (breakpoints_inserted) | |
500 | { | |
501 | remove_breakpoints (); | |
502 | target_resume (pid, 1, 0); /* Single step */ | |
749e538b | 503 | /* FIXME: What if a signal arrives instead of the single-step |
18122d8b | 504 | happening? */ |
de43d7d0 SG |
505 | target_wait (pid, NULL); |
506 | insert_breakpoints (); | |
507 | } | |
508 | target_resume (-1, 0, 0); | |
509 | continue; | |
510 | } | |
511 | else | |
512 | if (pid != inferior_pid) | |
513 | goto switch_thread; | |
514 | ||
37c99ddb JK |
515 | if (pid != inferior_pid) |
516 | { | |
517 | int printed = 0; | |
518 | ||
519 | if (!in_thread_list (pid)) | |
520 | { | |
199b2450 | 521 | fprintf_unfiltered (gdb_stderr, "[New %s]\n", target_pid_to_str (pid)); |
37c99ddb JK |
522 | add_thread (pid); |
523 | ||
de43d7d0 | 524 | target_resume (-1, 0, 0); |
37c99ddb JK |
525 | continue; |
526 | } | |
527 | else | |
528 | { | |
37c99ddb JK |
529 | if (stop_signal >= NSIG || signal_print[stop_signal]) |
530 | { | |
531 | char *signame; | |
532 | ||
533 | printed = 1; | |
534 | target_terminal_ours_for_output (); | |
535 | printf_filtered ("\nProgram received signal "); | |
536 | signame = strsigno (stop_signal); | |
537 | if (signame == NULL) | |
538 | printf_filtered ("%d", stop_signal); | |
539 | else | |
540 | printf_filtered ("%s (%d)", signame, stop_signal); | |
541 | printf_filtered (", %s\n", safe_strsignal (stop_signal)); | |
542 | ||
199b2450 | 543 | gdb_flush (gdb_stdout); |
37c99ddb JK |
544 | } |
545 | ||
de43d7d0 SG |
546 | if (stop_signal == SIGTRAP |
547 | || stop_signal >= NSIG | |
548 | || signal_stop[stop_signal]) | |
37c99ddb | 549 | { |
de43d7d0 | 550 | switch_thread: |
37c99ddb JK |
551 | inferior_pid = pid; |
552 | printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid)); | |
553 | ||
554 | flush_cached_frames (); | |
555 | registers_changed (); | |
556 | trap_expected = 0; | |
557 | if (step_resume_breakpoint) | |
558 | { | |
559 | delete_breakpoint (step_resume_breakpoint); | |
560 | step_resume_breakpoint = NULL; | |
561 | } | |
562 | prev_pc = 0; | |
563 | prev_sp = 0; | |
564 | prev_func_name = NULL; | |
565 | step_range_start = 0; | |
566 | step_range_end = 0; | |
567 | step_frame_address = 0; | |
568 | handling_longjmp = 0; | |
569 | another_trap = 0; | |
570 | } | |
571 | else | |
572 | { | |
573 | if (printed) | |
574 | target_terminal_inferior (); | |
575 | ||
576 | /* Clear the signal if it should not be passed. */ | |
577 | if (signal_program[stop_signal] == 0) | |
578 | stop_signal = 0; | |
579 | ||
de43d7d0 | 580 | target_resume (-1, 0, stop_signal); |
37c99ddb JK |
581 | continue; |
582 | } | |
583 | } | |
584 | } | |
585 | ||
bd5635a1 RP |
586 | #ifdef NO_SINGLE_STEP |
587 | if (one_stepped) | |
588 | single_step (0); /* This actually cleans up the ss */ | |
589 | #endif /* NO_SINGLE_STEP */ | |
590 | ||
9f739abd SG |
591 | /* If PC is pointing at a nullified instruction, then step beyond it so that |
592 | the user won't be confused when GDB appears to be ready to execute it. */ | |
593 | ||
594 | if (INSTRUCTION_NULLIFIED) | |
595 | { | |
596 | resume (1, 0); | |
597 | continue; | |
598 | } | |
599 | ||
37c99ddb | 600 | set_current_frame ( create_new_frame (read_fp (), stop_pc)); |
fe675038 | 601 | |
bd5635a1 | 602 | stop_frame_address = FRAME_FP (get_current_frame ()); |
fee44494 | 603 | stop_sp = read_sp (); |
bd5635a1 RP |
604 | stop_func_start = 0; |
605 | stop_func_name = 0; | |
606 | /* Don't care about return value; stop_func_start and stop_func_name | |
607 | will both be 0 if it doesn't work. */ | |
37c99ddb | 608 | find_pc_partial_function (stop_pc, &stop_func_name, &stop_func_start, |
199b2450 | 609 | NULL); |
bd5635a1 RP |
610 | stop_func_start += FUNCTION_START_OFFSET; |
611 | another_trap = 0; | |
612 | bpstat_clear (&stop_bpstat); | |
613 | stop_step = 0; | |
614 | stop_stack_dummy = 0; | |
615 | stop_print_frame = 1; | |
bd5635a1 RP |
616 | random_signal = 0; |
617 | stopped_by_random_signal = 0; | |
618 | breakpoints_failed = 0; | |
619 | ||
620 | /* Look at the cause of the stop, and decide what to do. | |
621 | The alternatives are: | |
622 | 1) break; to really stop and return to the debugger, | |
623 | 2) drop through to start up again | |
624 | (set another_trap to 1 to single step once) | |
625 | 3) set random_signal to 1, and the decision between 1 and 2 | |
626 | will be made according to the signal handling tables. */ | |
627 | ||
bd5635a1 RP |
628 | /* First, distinguish signals caused by the debugger from signals |
629 | that have to do with the program's own actions. | |
630 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
631 | or SIGEMT, depending on the operating system version. | |
632 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
633 | and change it to SIGTRAP. */ | |
634 | ||
635 | if (stop_signal == SIGTRAP | |
636 | || (breakpoints_inserted && | |
637 | (stop_signal == SIGILL | |
e37a6e9c PB |
638 | #ifdef SIGEMT |
639 | || stop_signal == SIGEMT | |
640 | #endif | |
641 | )) | |
bd5635a1 RP |
642 | || stop_soon_quietly) |
643 | { | |
644 | if (stop_signal == SIGTRAP && stop_after_trap) | |
645 | { | |
646 | stop_print_frame = 0; | |
647 | break; | |
648 | } | |
649 | if (stop_soon_quietly) | |
650 | break; | |
651 | ||
652 | /* Don't even think about breakpoints | |
653 | if just proceeded over a breakpoint. | |
654 | ||
655 | However, if we are trying to proceed over a breakpoint | |
fe675038 | 656 | and end up in sigtramp, then step_resume_breakpoint |
bd5635a1 RP |
657 | will be set and we should check whether we've hit the |
658 | step breakpoint. */ | |
659 | if (stop_signal == SIGTRAP && trap_expected | |
fe675038 | 660 | && step_resume_breakpoint == NULL) |
bd5635a1 RP |
661 | bpstat_clear (&stop_bpstat); |
662 | else | |
663 | { | |
664 | /* See if there is a breakpoint at the current PC. */ | |
cb6b0202 JK |
665 | stop_bpstat = bpstat_stop_status |
666 | (&stop_pc, stop_frame_address, | |
bd5635a1 | 667 | #if DECR_PC_AFTER_BREAK |
cb6b0202 JK |
668 | /* Notice the case of stepping through a jump |
669 | that lands just after a breakpoint. | |
670 | Don't confuse that with hitting the breakpoint. | |
671 | What we check for is that 1) stepping is going on | |
672 | and 2) the pc before the last insn does not match | |
673 | the address of the breakpoint before the current pc. */ | |
674 | (prev_pc != stop_pc - DECR_PC_AFTER_BREAK | |
675 | && CURRENTLY_STEPPING ()) | |
676 | #else /* DECR_PC_AFTER_BREAK zero */ | |
677 | 0 | |
678 | #endif /* DECR_PC_AFTER_BREAK zero */ | |
679 | ); | |
680 | /* Following in case break condition called a | |
681 | function. */ | |
682 | stop_print_frame = 1; | |
bd5635a1 | 683 | } |
fe675038 | 684 | |
bd5635a1 RP |
685 | if (stop_signal == SIGTRAP) |
686 | random_signal | |
687 | = !(bpstat_explains_signal (stop_bpstat) | |
688 | || trap_expected | |
84d59861 | 689 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
bd5635a1 | 690 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) |
84d59861 | 691 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
fe675038 | 692 | || (step_range_end && step_resume_breakpoint == NULL)); |
bd5635a1 RP |
693 | else |
694 | { | |
695 | random_signal | |
696 | = !(bpstat_explains_signal (stop_bpstat) | |
bd5635a1 RP |
697 | /* End of a stack dummy. Some systems (e.g. Sony |
698 | news) give another signal besides SIGTRAP, | |
699 | so check here as well as above. */ | |
84d59861 | 700 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
d747e0af | 701 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) |
84d59861 | 702 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
bd5635a1 RP |
703 | ); |
704 | if (!random_signal) | |
705 | stop_signal = SIGTRAP; | |
706 | } | |
707 | } | |
708 | else | |
709 | random_signal = 1; | |
fe675038 | 710 | |
bd5635a1 RP |
711 | /* For the program's own signals, act according to |
712 | the signal handling tables. */ | |
fe675038 | 713 | |
bd5635a1 RP |
714 | if (random_signal) |
715 | { | |
716 | /* Signal not for debugging purposes. */ | |
717 | int printed = 0; | |
718 | ||
719 | stopped_by_random_signal = 1; | |
720 | ||
721 | if (stop_signal >= NSIG | |
722 | || signal_print[stop_signal]) | |
723 | { | |
fee44494 | 724 | char *signame; |
bd5635a1 RP |
725 | printed = 1; |
726 | target_terminal_ours_for_output (); | |
727 | #ifdef PRINT_RANDOM_SIGNAL | |
728 | PRINT_RANDOM_SIGNAL (stop_signal); | |
729 | #else | |
fee44494 JK |
730 | printf_filtered ("\nProgram received signal "); |
731 | signame = strsigno (stop_signal); | |
732 | if (signame == NULL) | |
733 | printf_filtered ("%d", stop_signal); | |
734 | else | |
735 | /* Do we need to print the number as well as the name? */ | |
736 | printf_filtered ("%s (%d)", signame, stop_signal); | |
737 | printf_filtered (", %s\n", safe_strsignal (stop_signal)); | |
bd5635a1 | 738 | #endif /* PRINT_RANDOM_SIGNAL */ |
199b2450 | 739 | gdb_flush (gdb_stdout); |
bd5635a1 RP |
740 | } |
741 | if (stop_signal >= NSIG | |
742 | || signal_stop[stop_signal]) | |
743 | break; | |
744 | /* If not going to stop, give terminal back | |
745 | if we took it away. */ | |
746 | else if (printed) | |
747 | target_terminal_inferior (); | |
b7f81b57 | 748 | |
101b7f9c PS |
749 | /* Clear the signal if it should not be passed. */ |
750 | if (signal_program[stop_signal] == 0) | |
751 | stop_signal = 0; | |
752 | ||
fe675038 JK |
753 | /* I'm not sure whether this needs to be check_sigtramp2 or |
754 | whether it could/should be keep_going. */ | |
755 | goto check_sigtramp2; | |
bd5635a1 | 756 | } |
30875e1c | 757 | |
bd5635a1 | 758 | /* Handle cases caused by hitting a breakpoint. */ |
fe675038 JK |
759 | { |
760 | CORE_ADDR jmp_buf_pc; | |
29c6dce2 JK |
761 | struct bpstat_what what; |
762 | ||
763 | what = bpstat_what (stop_bpstat); | |
bd5635a1 | 764 | |
84d59861 JK |
765 | if (what.call_dummy) |
766 | { | |
767 | stop_stack_dummy = 1; | |
768 | #ifdef HP_OS_BUG | |
769 | trap_expected_after_continue = 1; | |
770 | #endif | |
771 | } | |
772 | ||
fe675038 JK |
773 | switch (what.main_action) |
774 | { | |
775 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
776 | /* If we hit the breakpoint at longjmp, disable it for the | |
777 | duration of this command. Then, install a temporary | |
778 | breakpoint at the target of the jmp_buf. */ | |
779 | disable_longjmp_breakpoint(); | |
780 | remove_breakpoints (); | |
781 | breakpoints_inserted = 0; | |
782 | if (!GET_LONGJMP_TARGET(&jmp_buf_pc)) goto keep_going; | |
783 | ||
784 | /* Need to blow away step-resume breakpoint, as it | |
785 | interferes with us */ | |
786 | if (step_resume_breakpoint != NULL) | |
787 | { | |
788 | delete_breakpoint (step_resume_breakpoint); | |
789 | step_resume_breakpoint = NULL; | |
790 | what.step_resume = 0; | |
791 | } | |
30875e1c | 792 | |
101b7f9c | 793 | #if 0 |
fe675038 JK |
794 | /* FIXME - Need to implement nested temporary breakpoints */ |
795 | if (step_over_calls > 0) | |
796 | set_longjmp_resume_breakpoint(jmp_buf_pc, | |
797 | get_current_frame()); | |
798 | else | |
30875e1c | 799 | #endif /* 0 */ |
fe675038 JK |
800 | set_longjmp_resume_breakpoint(jmp_buf_pc, NULL); |
801 | handling_longjmp = 1; /* FIXME */ | |
802 | goto keep_going; | |
803 | ||
804 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: | |
805 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
806 | remove_breakpoints (); | |
807 | breakpoints_inserted = 0; | |
101b7f9c | 808 | #if 0 |
fe675038 JK |
809 | /* FIXME - Need to implement nested temporary breakpoints */ |
810 | if (step_over_calls | |
811 | && (stop_frame_address | |
812 | INNER_THAN step_frame_address)) | |
813 | { | |
814 | another_trap = 1; | |
815 | goto keep_going; | |
816 | } | |
30875e1c | 817 | #endif /* 0 */ |
fe675038 JK |
818 | disable_longjmp_breakpoint(); |
819 | handling_longjmp = 0; /* FIXME */ | |
820 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
101b7f9c | 821 | break; |
fe675038 JK |
822 | /* else fallthrough */ |
823 | ||
824 | case BPSTAT_WHAT_SINGLE: | |
825 | if (breakpoints_inserted) | |
826 | remove_breakpoints (); | |
827 | breakpoints_inserted = 0; | |
828 | another_trap = 1; | |
829 | /* Still need to check other stuff, at least the case | |
830 | where we are stepping and step out of the right range. */ | |
831 | break; | |
832 | ||
833 | case BPSTAT_WHAT_STOP_NOISY: | |
834 | stop_print_frame = 1; | |
835 | /* We are about to nuke the step_resume_breakpoint via the | |
836 | cleanup chain, so no need to worry about it here. */ | |
837 | goto stop_stepping; | |
101b7f9c | 838 | |
fe675038 JK |
839 | case BPSTAT_WHAT_STOP_SILENT: |
840 | stop_print_frame = 0; | |
841 | /* We are about to nuke the step_resume_breakpoint via the | |
842 | cleanup chain, so no need to worry about it here. */ | |
843 | goto stop_stepping; | |
844 | ||
100f92e2 JK |
845 | case BPSTAT_WHAT_LAST: |
846 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
847 | ||
fe675038 JK |
848 | case BPSTAT_WHAT_KEEP_CHECKING: |
849 | break; | |
850 | } | |
851 | ||
852 | if (what.step_resume) | |
30875e1c | 853 | { |
fe675038 JK |
854 | delete_breakpoint (step_resume_breakpoint); |
855 | step_resume_breakpoint = NULL; | |
30875e1c | 856 | |
fe675038 JK |
857 | /* If were waiting for a trap, hitting the step_resume_break |
858 | doesn't count as getting it. */ | |
859 | if (trap_expected) | |
860 | another_trap = 1; | |
30875e1c | 861 | } |
fe675038 | 862 | } |
30875e1c SG |
863 | |
864 | /* We come here if we hit a breakpoint but should not | |
865 | stop for it. Possibly we also were stepping | |
866 | and should stop for that. So fall through and | |
867 | test for stepping. But, if not stepping, | |
868 | do not stop. */ | |
869 | ||
84d59861 JK |
870 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
871 | /* This is the old way of detecting the end of the stack dummy. | |
872 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
873 | handled above. As soon as we can test it on all of them, all | |
874 | architectures should define it. */ | |
875 | ||
bd5635a1 | 876 | /* If this is the breakpoint at the end of a stack dummy, |
c9de302b SG |
877 | just stop silently, unless the user was doing an si/ni, in which |
878 | case she'd better know what she's doing. */ | |
879 | ||
880 | if (PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) | |
881 | && !step_range_end) | |
882 | { | |
883 | stop_print_frame = 0; | |
884 | stop_stack_dummy = 1; | |
bd5635a1 | 885 | #ifdef HP_OS_BUG |
c9de302b | 886 | trap_expected_after_continue = 1; |
bd5635a1 | 887 | #endif |
c9de302b SG |
888 | break; |
889 | } | |
84d59861 JK |
890 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
891 | ||
fe675038 | 892 | if (step_resume_breakpoint) |
bd5635a1 RP |
893 | /* Having a step-resume breakpoint overrides anything |
894 | else having to do with stepping commands until | |
895 | that breakpoint is reached. */ | |
fe675038 JK |
896 | /* I suspect this could/should be keep_going, because if the |
897 | check_sigtramp2 check succeeds, then it will put in another | |
898 | step_resume_breakpoint, and we aren't (yet) prepared to nest | |
899 | them. */ | |
900 | goto check_sigtramp2; | |
901 | ||
902 | if (step_range_end == 0) | |
903 | /* Likewise if we aren't even stepping. */ | |
904 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
905 | whether it could/should be keep_going. */ | |
906 | goto check_sigtramp2; | |
907 | ||
bd5635a1 | 908 | /* If stepping through a line, keep going if still within it. */ |
fe675038 JK |
909 | if (stop_pc >= step_range_start |
910 | && stop_pc < step_range_end | |
911 | /* The step range might include the start of the | |
912 | function, so if we are at the start of the | |
913 | step range and either the stack or frame pointers | |
914 | just changed, we've stepped outside */ | |
915 | && !(stop_pc == step_range_start | |
916 | && stop_frame_address | |
917 | && (stop_sp INNER_THAN prev_sp | |
918 | || stop_frame_address != step_frame_address))) | |
bd5635a1 | 919 | { |
fe675038 JK |
920 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. |
921 | So definately need to check for sigtramp here. */ | |
922 | goto check_sigtramp2; | |
bd5635a1 | 923 | } |
fe675038 | 924 | |
bd5635a1 RP |
925 | /* We stepped out of the stepping range. See if that was due |
926 | to a subroutine call that we should proceed to the end of. */ | |
fe675038 JK |
927 | |
928 | /* Did we just take a signal? */ | |
929 | if (IN_SIGTRAMP (stop_pc, stop_func_name) | |
930 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) | |
bd5635a1 | 931 | { |
fe675038 JK |
932 | /* This code is needed at least in the following case: |
933 | The user types "next" and then a signal arrives (before | |
934 | the "next" is done). */ | |
935 | /* We've just taken a signal; go until we are back to | |
936 | the point where we took it and one more. */ | |
937 | { | |
938 | struct symtab_and_line sr_sal; | |
939 | ||
940 | sr_sal.pc = prev_pc; | |
941 | sr_sal.symtab = NULL; | |
942 | sr_sal.line = 0; | |
943 | step_resume_breakpoint = | |
944 | set_momentary_breakpoint (sr_sal, get_current_frame (), | |
945 | bp_step_resume); | |
946 | if (breakpoints_inserted) | |
947 | insert_breakpoints (); | |
948 | } | |
bd5635a1 | 949 | |
fe675038 JK |
950 | /* If this is stepi or nexti, make sure that the stepping range |
951 | gets us past that instruction. */ | |
952 | if (step_range_end == 1) | |
953 | /* FIXME: Does this run afoul of the code below which, if | |
954 | we step into the middle of a line, resets the stepping | |
955 | range? */ | |
956 | step_range_end = (step_range_start = prev_pc) + 1; | |
101b7f9c | 957 | |
fe675038 JK |
958 | remove_breakpoints_on_following_step = 1; |
959 | goto keep_going; | |
960 | } | |
30875e1c | 961 | |
fe675038 JK |
962 | if (stop_func_start) |
963 | { | |
964 | /* Do this after the IN_SIGTRAMP check; it might give | |
965 | an error. */ | |
966 | prologue_pc = stop_func_start; | |
967 | SKIP_PROLOGUE (prologue_pc); | |
968 | } | |
30875e1c | 969 | |
c0c14c1e JK |
970 | if ((/* Might be a non-recursive call. If the symbols are missing |
971 | enough that stop_func_start == prev_func_start even though | |
972 | they are really two functions, we will treat some calls as | |
973 | jumps. */ | |
974 | stop_func_start != prev_func_start | |
975 | ||
976 | /* Might be a recursive call if either we have a prologue | |
977 | or the call instruction itself saves the PC on the stack. */ | |
978 | || prologue_pc != stop_func_start | |
979 | || stop_sp != prev_sp) | |
199b2450 TL |
980 | && (/* PC is completely out of bounds of any known objfiles. Treat |
981 | like a subroutine call. */ | |
982 | ! stop_func_start | |
c0c14c1e JK |
983 | |
984 | /* If we do a call, we will be at the start of a function. */ | |
985 | || stop_pc == stop_func_start | |
986 | ||
987 | #if 0 | |
988 | /* Not conservative enough for 4.11. FIXME: enable this | |
989 | after 4.11. */ | |
990 | /* Except on the Alpha with -O (and perhaps other machines | |
991 | with similar calling conventions), in which we might | |
992 | call the address after the load of gp. Since prologues | |
993 | don't contain calls, we can't return to within one, and | |
994 | we don't jump back into them, so this check is OK. */ | |
995 | || stop_pc < prologue_pc | |
996 | #endif | |
d747e0af | 997 | |
c0c14c1e JK |
998 | /* If we end up in certain places, it means we did a subroutine |
999 | call. I'm not completely sure this is necessary now that we | |
1000 | have the above checks with stop_func_start (and now that | |
100f92e2 | 1001 | find_pc_partial_function is pickier). */ |
c0c14c1e JK |
1002 | || IN_SOLIB_TRAMPOLINE (stop_pc, stop_func_name) |
1003 | ||
1004 | /* If none of the above apply, it is a jump within a function, | |
1005 | or a return from a subroutine. The other case is longjmp, | |
1006 | which can no longer happen here as long as the | |
1007 | handling_longjmp stuff is working. */ | |
1008 | )) | |
fe675038 JK |
1009 | { |
1010 | /* It's a subroutine call. */ | |
fee44494 | 1011 | |
fe675038 JK |
1012 | if (step_over_calls == 0) |
1013 | { | |
1014 | /* I presume that step_over_calls is only 0 when we're | |
1015 | supposed to be stepping at the assembly language level | |
1016 | ("stepi"). Just stop. */ | |
1017 | stop_step = 1; | |
1018 | break; | |
1019 | } | |
fee44494 | 1020 | |
fe675038 JK |
1021 | if (step_over_calls > 0) |
1022 | /* We're doing a "next". */ | |
1023 | goto step_over_function; | |
1024 | ||
1025 | /* If we are in a function call trampoline (a stub between | |
1026 | the calling routine and the real function), locate the real | |
1027 | function. That's what tells us (a) whether we want to step | |
1028 | into it at all, and (b) what prologue we want to run to | |
1029 | the end of, if we do step into it. */ | |
1030 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
1031 | if (tmp != 0) | |
1032 | stop_func_start = tmp; | |
1033 | ||
1034 | /* If we have line number information for the function we | |
1035 | are thinking of stepping into, step into it. | |
1036 | ||
1037 | If there are several symtabs at that PC (e.g. with include | |
1038 | files), just want to know whether *any* of them have line | |
1039 | numbers. find_pc_line handles this. */ | |
1040 | { | |
1041 | struct symtab_and_line tmp_sal; | |
1042 | ||
1043 | tmp_sal = find_pc_line (stop_func_start, 0); | |
1044 | if (tmp_sal.line != 0) | |
1045 | goto step_into_function; | |
1046 | } | |
d747e0af MT |
1047 | |
1048 | step_over_function: | |
fe675038 JK |
1049 | /* A subroutine call has happened. */ |
1050 | { | |
1051 | /* Set a special breakpoint after the return */ | |
1052 | struct symtab_and_line sr_sal; | |
1053 | sr_sal.pc = | |
1054 | ADDR_BITS_REMOVE | |
1055 | (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
1056 | sr_sal.symtab = NULL; | |
1057 | sr_sal.line = 0; | |
1058 | step_resume_breakpoint = | |
1059 | set_momentary_breakpoint (sr_sal, get_current_frame (), | |
1060 | bp_step_resume); | |
1061 | if (breakpoints_inserted) | |
1062 | insert_breakpoints (); | |
1063 | } | |
1064 | goto keep_going; | |
d747e0af MT |
1065 | |
1066 | step_into_function: | |
fe675038 JK |
1067 | /* Subroutine call with source code we should not step over. |
1068 | Do step to the first line of code in it. */ | |
1069 | SKIP_PROLOGUE (stop_func_start); | |
1070 | sal = find_pc_line (stop_func_start, 0); | |
1071 | /* Use the step_resume_break to step until | |
1072 | the end of the prologue, even if that involves jumps | |
1073 | (as it seems to on the vax under 4.2). */ | |
1074 | /* If the prologue ends in the middle of a source line, | |
1075 | continue to the end of that source line. | |
1076 | Otherwise, just go to end of prologue. */ | |
bd5635a1 | 1077 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP |
fe675038 JK |
1078 | /* no, don't either. It skips any code that's |
1079 | legitimately on the first line. */ | |
bd5635a1 | 1080 | #else |
fe675038 JK |
1081 | if (sal.end && sal.pc != stop_func_start) |
1082 | stop_func_start = sal.end; | |
bd5635a1 | 1083 | #endif |
d747e0af | 1084 | |
fe675038 JK |
1085 | if (stop_func_start == stop_pc) |
1086 | { | |
1087 | /* We are already there: stop now. */ | |
1088 | stop_step = 1; | |
1089 | break; | |
1090 | } | |
1091 | else | |
1092 | /* Put the step-breakpoint there and go until there. */ | |
1093 | { | |
1094 | struct symtab_and_line sr_sal; | |
1095 | ||
1096 | sr_sal.pc = stop_func_start; | |
1097 | sr_sal.symtab = NULL; | |
1098 | sr_sal.line = 0; | |
1099 | /* Do not specify what the fp should be when we stop | |
1100 | since on some machines the prologue | |
1101 | is where the new fp value is established. */ | |
1102 | step_resume_breakpoint = | |
84d59861 | 1103 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); |
fe675038 JK |
1104 | if (breakpoints_inserted) |
1105 | insert_breakpoints (); | |
1106 | ||
1107 | /* And make sure stepping stops right away then. */ | |
1108 | step_range_end = step_range_start; | |
bd5635a1 | 1109 | } |
fe675038 JK |
1110 | goto keep_going; |
1111 | } | |
d747e0af | 1112 | |
fe675038 JK |
1113 | /* We've wandered out of the step range (but haven't done a |
1114 | subroutine call or return). (Is that true? I think we get | |
1115 | here if we did a return and maybe a longjmp). */ | |
d747e0af | 1116 | |
fe675038 JK |
1117 | sal = find_pc_line(stop_pc, 0); |
1118 | ||
1119 | if (step_range_end == 1) | |
1120 | { | |
1121 | /* It is stepi or nexti. We always want to stop stepping after | |
1122 | one instruction. */ | |
1123 | stop_step = 1; | |
1124 | break; | |
1125 | } | |
1126 | ||
1127 | if (sal.line == 0) | |
1128 | { | |
1129 | /* We have no line number information. That means to stop | |
1130 | stepping (does this always happen right after one instruction, | |
1131 | when we do "s" in a function with no line numbers, | |
1132 | or can this happen as a result of a return or longjmp?). */ | |
1133 | stop_step = 1; | |
1134 | break; | |
1135 | } | |
1136 | ||
1137 | if (stop_pc == sal.pc && current_line != sal.line) | |
1138 | { | |
1139 | /* We are at the start of a different line. So stop. Note that | |
1140 | we don't stop if we step into the middle of a different line. | |
1141 | That is said to make things like for (;;) statements work | |
1142 | better. */ | |
1143 | stop_step = 1; | |
1144 | break; | |
bd5635a1 RP |
1145 | } |
1146 | ||
fe675038 JK |
1147 | /* We aren't done stepping. |
1148 | ||
1149 | Optimize by setting the stepping range to the line. | |
1150 | (We might not be in the original line, but if we entered a | |
1151 | new line in mid-statement, we continue stepping. This makes | |
1152 | things like for(;;) statements work better.) */ | |
1153 | step_range_start = sal.pc; | |
1154 | step_range_end = sal.end; | |
1155 | goto keep_going; | |
1156 | ||
1157 | check_sigtramp2: | |
d747e0af MT |
1158 | if (trap_expected |
1159 | && IN_SIGTRAMP (stop_pc, stop_func_name) | |
1160 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) | |
bd5635a1 RP |
1161 | { |
1162 | /* What has happened here is that we have just stepped the inferior | |
1163 | with a signal (because it is a signal which shouldn't make | |
1164 | us stop), thus stepping into sigtramp. | |
1165 | ||
1166 | So we need to set a step_resume_break_address breakpoint | |
fe675038 JK |
1167 | and continue until we hit it, and then step. FIXME: This should |
1168 | be more enduring than a step_resume breakpoint; we should know | |
1169 | that we will later need to keep going rather than re-hitting | |
1170 | the breakpoint here (see testsuite/gdb.t06/signals.exp where | |
1171 | it says "exceedingly difficult"). */ | |
1172 | struct symtab_and_line sr_sal; | |
1173 | ||
1174 | sr_sal.pc = prev_pc; | |
1175 | sr_sal.symtab = NULL; | |
1176 | sr_sal.line = 0; | |
1177 | step_resume_breakpoint = | |
1178 | set_momentary_breakpoint (sr_sal, get_current_frame (), | |
1179 | bp_step_resume); | |
bd5635a1 | 1180 | if (breakpoints_inserted) |
fe675038 JK |
1181 | insert_breakpoints (); |
1182 | ||
bd5635a1 RP |
1183 | remove_breakpoints_on_following_step = 1; |
1184 | another_trap = 1; | |
1185 | } | |
1186 | ||
30875e1c | 1187 | keep_going: |
fe675038 JK |
1188 | /* Come to this label when you need to resume the inferior. |
1189 | It's really much cleaner to do a goto than a maze of if-else | |
1190 | conditions. */ | |
30875e1c | 1191 | |
bd5635a1 RP |
1192 | /* Save the pc before execution, to compare with pc after stop. */ |
1193 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
1194 | prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER | |
1195 | BREAK is defined, the | |
1196 | original pc would not have | |
1197 | been at the start of a | |
1198 | function. */ | |
1199 | prev_func_name = stop_func_name; | |
1200 | prev_sp = stop_sp; | |
1201 | ||
1202 | /* If we did not do break;, it means we should keep | |
1203 | running the inferior and not return to debugger. */ | |
1204 | ||
1205 | if (trap_expected && stop_signal != SIGTRAP) | |
1206 | { | |
1207 | /* We took a signal (which we are supposed to pass through to | |
1208 | the inferior, else we'd have done a break above) and we | |
1209 | haven't yet gotten our trap. Simply continue. */ | |
cb6b0202 | 1210 | resume (CURRENTLY_STEPPING (), stop_signal); |
bd5635a1 RP |
1211 | } |
1212 | else | |
1213 | { | |
1214 | /* Either the trap was not expected, but we are continuing | |
1215 | anyway (the user asked that this signal be passed to the | |
1216 | child) | |
1217 | -- or -- | |
1218 | The signal was SIGTRAP, e.g. it was our signal, but we | |
1219 | decided we should resume from it. | |
1220 | ||
1221 | We're going to run this baby now! | |
1222 | ||
1223 | Insert breakpoints now, unless we are trying | |
1224 | to one-proceed past a breakpoint. */ | |
1225 | /* If we've just finished a special step resume and we don't | |
1226 | want to hit a breakpoint, pull em out. */ | |
fe675038 | 1227 | if (step_resume_breakpoint == NULL && |
bd5635a1 RP |
1228 | remove_breakpoints_on_following_step) |
1229 | { | |
1230 | remove_breakpoints_on_following_step = 0; | |
1231 | remove_breakpoints (); | |
1232 | breakpoints_inserted = 0; | |
1233 | } | |
1234 | else if (!breakpoints_inserted && | |
fe675038 | 1235 | (step_resume_breakpoint != NULL || !another_trap)) |
bd5635a1 | 1236 | { |
bd5635a1 RP |
1237 | breakpoints_failed = insert_breakpoints (); |
1238 | if (breakpoints_failed) | |
1239 | break; | |
1240 | breakpoints_inserted = 1; | |
1241 | } | |
1242 | ||
1243 | trap_expected = another_trap; | |
1244 | ||
1245 | if (stop_signal == SIGTRAP) | |
1246 | stop_signal = 0; | |
1247 | ||
1248 | #ifdef SHIFT_INST_REGS | |
1249 | /* I'm not sure when this following segment applies. I do know, now, | |
1250 | that we shouldn't rewrite the regs when we were stopped by a | |
1251 | random signal from the inferior process. */ | |
cef4c2e7 PS |
1252 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? |
1253 | (this is only used on the 88k). */ | |
bd5635a1 | 1254 | |
d11c44f1 JG |
1255 | if (!bpstat_explains_signal (stop_bpstat) |
1256 | && (stop_signal != SIGCLD) | |
bd5635a1 | 1257 | && !stopped_by_random_signal) |
07a5991a | 1258 | SHIFT_INST_REGS(); |
bd5635a1 RP |
1259 | #endif /* SHIFT_INST_REGS */ |
1260 | ||
cb6b0202 | 1261 | resume (CURRENTLY_STEPPING (), stop_signal); |
bd5635a1 RP |
1262 | } |
1263 | } | |
30875e1c SG |
1264 | |
1265 | stop_stepping: | |
bd5635a1 RP |
1266 | if (target_has_execution) |
1267 | { | |
1268 | /* Assuming the inferior still exists, set these up for next | |
1269 | time, just like we did above if we didn't break out of the | |
1270 | loop. */ | |
1271 | prev_pc = read_pc (); | |
1272 | prev_func_start = stop_func_start; | |
1273 | prev_func_name = stop_func_name; | |
1274 | prev_sp = stop_sp; | |
1275 | } | |
fe675038 | 1276 | do_cleanups (old_cleanups); |
bd5635a1 RP |
1277 | } |
1278 | \f | |
1279 | /* Here to return control to GDB when the inferior stops for real. | |
1280 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
1281 | ||
1282 | STOP_PRINT_FRAME nonzero means print the executing frame | |
1283 | (pc, function, args, file, line number and line text). | |
1284 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
1285 | attempting to insert breakpoints. */ | |
1286 | ||
1287 | void | |
1288 | normal_stop () | |
1289 | { | |
1290 | /* Make sure that the current_frame's pc is correct. This | |
1291 | is a correction for setting up the frame info before doing | |
1292 | DECR_PC_AFTER_BREAK */ | |
3f0184ac | 1293 | if (target_has_execution && get_current_frame()) |
bd5635a1 RP |
1294 | (get_current_frame ())->pc = read_pc (); |
1295 | ||
1296 | if (breakpoints_failed) | |
1297 | { | |
1298 | target_terminal_ours_for_output (); | |
1299 | print_sys_errmsg ("ptrace", breakpoints_failed); | |
e37a6e9c | 1300 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
bd5635a1 RP |
1301 | The same program may be running in another process.\n"); |
1302 | } | |
1303 | ||
bd5635a1 RP |
1304 | if (target_has_execution && breakpoints_inserted) |
1305 | if (remove_breakpoints ()) | |
1306 | { | |
1307 | target_terminal_ours_for_output (); | |
e37a6e9c | 1308 | printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\ |
bd5635a1 RP |
1309 | It might be running in another process.\n\ |
1310 | Further execution is probably impossible.\n"); | |
1311 | } | |
1312 | ||
1313 | breakpoints_inserted = 0; | |
1314 | ||
1315 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
1316 | Delete any breakpoint that is to be deleted at the next stop. */ | |
1317 | ||
1318 | breakpoint_auto_delete (stop_bpstat); | |
1319 | ||
1320 | /* If an auto-display called a function and that got a signal, | |
1321 | delete that auto-display to avoid an infinite recursion. */ | |
1322 | ||
1323 | if (stopped_by_random_signal) | |
1324 | disable_current_display (); | |
1325 | ||
1326 | if (step_multi && stop_step) | |
1327 | return; | |
1328 | ||
1329 | target_terminal_ours (); | |
1330 | ||
3950a34e RP |
1331 | /* Look up the hook_stop and run it if it exists. */ |
1332 | ||
1333 | if (stop_command->hook) | |
1334 | { | |
1335 | catch_errors (hook_stop_stub, (char *)stop_command->hook, | |
fee44494 | 1336 | "Error while running hook_stop:\n", RETURN_MASK_ALL); |
3950a34e RP |
1337 | } |
1338 | ||
bd5635a1 RP |
1339 | if (!target_has_stack) |
1340 | return; | |
1341 | ||
1342 | /* Select innermost stack frame except on return from a stack dummy routine, | |
1515ff18 JG |
1343 | or if the program has exited. Print it without a level number if |
1344 | we have changed functions or hit a breakpoint. Print source line | |
1345 | if we have one. */ | |
bd5635a1 RP |
1346 | if (!stop_stack_dummy) |
1347 | { | |
1348 | select_frame (get_current_frame (), 0); | |
1349 | ||
1350 | if (stop_print_frame) | |
1351 | { | |
1515ff18 JG |
1352 | int source_only; |
1353 | ||
1354 | source_only = bpstat_print (stop_bpstat); | |
1355 | source_only = source_only || | |
1356 | ( stop_step | |
bd5635a1 | 1357 | && step_frame_address == stop_frame_address |
1515ff18 JG |
1358 | && step_start_function == find_pc_function (stop_pc)); |
1359 | ||
1360 | print_stack_frame (selected_frame, -1, source_only? -1: 1); | |
bd5635a1 RP |
1361 | |
1362 | /* Display the auto-display expressions. */ | |
1363 | do_displays (); | |
1364 | } | |
1365 | } | |
1366 | ||
1367 | /* Save the function value return registers, if we care. | |
1368 | We might be about to restore their previous contents. */ | |
1369 | if (proceed_to_finish) | |
1370 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
1371 | ||
1372 | if (stop_stack_dummy) | |
1373 | { | |
1374 | /* Pop the empty frame that contains the stack dummy. | |
1375 | POP_FRAME ends with a setting of the current frame, so we | |
1376 | can use that next. */ | |
1377 | POP_FRAME; | |
1378 | select_frame (get_current_frame (), 0); | |
1379 | } | |
1380 | } | |
3950a34e RP |
1381 | |
1382 | static int | |
1383 | hook_stop_stub (cmd) | |
1384 | char *cmd; | |
1385 | { | |
1386 | execute_user_command ((struct cmd_list_element *)cmd, 0); | |
a8a69e63 | 1387 | return (0); |
3950a34e | 1388 | } |
bd5635a1 | 1389 | \f |
cc221e76 FF |
1390 | int signal_stop_state (signo) |
1391 | int signo; | |
1392 | { | |
1393 | return ((signo >= 0 && signo < NSIG) ? signal_stop[signo] : 0); | |
1394 | } | |
1395 | ||
1396 | int signal_print_state (signo) | |
1397 | int signo; | |
1398 | { | |
1399 | return ((signo >= 0 && signo < NSIG) ? signal_print[signo] : 0); | |
1400 | } | |
1401 | ||
1402 | int signal_pass_state (signo) | |
1403 | int signo; | |
1404 | { | |
1405 | return ((signo >= 0 && signo < NSIG) ? signal_program[signo] : 0); | |
1406 | } | |
1407 | ||
bd5635a1 RP |
1408 | static void |
1409 | sig_print_header () | |
1410 | { | |
1411 | printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n"); | |
1412 | } | |
1413 | ||
1414 | static void | |
1415 | sig_print_info (number) | |
1416 | int number; | |
1417 | { | |
e37a6e9c PB |
1418 | char *name; |
1419 | ||
1420 | if ((name = strsigno (number)) == NULL) | |
bd5635a1 RP |
1421 | printf_filtered ("%d\t\t", number); |
1422 | else | |
e37a6e9c | 1423 | printf_filtered ("%s (%d)\t", name, number); |
bd5635a1 RP |
1424 | printf_filtered ("%s\t", signal_stop[number] ? "Yes" : "No"); |
1425 | printf_filtered ("%s\t", signal_print[number] ? "Yes" : "No"); | |
1426 | printf_filtered ("%s\t\t", signal_program[number] ? "Yes" : "No"); | |
e37a6e9c | 1427 | printf_filtered ("%s\n", safe_strsignal (number)); |
bd5635a1 RP |
1428 | } |
1429 | ||
1430 | /* Specify how various signals in the inferior should be handled. */ | |
1431 | ||
1432 | static void | |
1433 | handle_command (args, from_tty) | |
1434 | char *args; | |
1435 | int from_tty; | |
1436 | { | |
072b552a JG |
1437 | char **argv; |
1438 | int digits, wordlen; | |
1439 | int sigfirst, signum, siglast; | |
1440 | int allsigs; | |
1441 | int nsigs; | |
1442 | unsigned char *sigs; | |
1443 | struct cleanup *old_chain; | |
1444 | ||
1445 | if (args == NULL) | |
1446 | { | |
1447 | error_no_arg ("signal to handle"); | |
1448 | } | |
bd5635a1 | 1449 | |
072b552a JG |
1450 | /* Allocate and zero an array of flags for which signals to handle. */ |
1451 | ||
1452 | nsigs = signo_max () + 1; | |
1453 | sigs = (unsigned char *) alloca (nsigs); | |
1454 | memset (sigs, 0, nsigs); | |
bd5635a1 | 1455 | |
072b552a JG |
1456 | /* Break the command line up into args. */ |
1457 | ||
1458 | argv = buildargv (args); | |
1459 | if (argv == NULL) | |
bd5635a1 | 1460 | { |
072b552a JG |
1461 | nomem (0); |
1462 | } | |
1463 | old_chain = make_cleanup (freeargv, (char *) argv); | |
bd5635a1 | 1464 | |
072b552a JG |
1465 | /* Walk through the args, looking for signal numbers, signal names, and |
1466 | actions. Signal numbers and signal names may be interspersed with | |
1467 | actions, with the actions being performed for all signals cumulatively | |
1468 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
bd5635a1 | 1469 | |
072b552a JG |
1470 | while (*argv != NULL) |
1471 | { | |
1472 | wordlen = strlen (*argv); | |
1473 | for (digits = 0; isdigit ((*argv)[digits]); digits++) {;} | |
1474 | allsigs = 0; | |
1475 | sigfirst = siglast = -1; | |
1476 | ||
1477 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
1478 | { | |
1479 | /* Apply action to all signals except those used by the | |
1480 | debugger. Silently skip those. */ | |
1481 | allsigs = 1; | |
1482 | sigfirst = 0; | |
1483 | siglast = nsigs - 1; | |
1484 | } | |
1485 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
1486 | { | |
1487 | SET_SIGS (nsigs, sigs, signal_stop); | |
1488 | SET_SIGS (nsigs, sigs, signal_print); | |
1489 | } | |
1490 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
1491 | { | |
1492 | UNSET_SIGS (nsigs, sigs, signal_program); | |
1493 | } | |
1494 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
1495 | { | |
1496 | SET_SIGS (nsigs, sigs, signal_print); | |
1497 | } | |
1498 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
1499 | { | |
1500 | SET_SIGS (nsigs, sigs, signal_program); | |
1501 | } | |
1502 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
1503 | { | |
1504 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
1505 | } | |
1506 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
1507 | { | |
1508 | SET_SIGS (nsigs, sigs, signal_program); | |
1509 | } | |
1510 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
1511 | { | |
1512 | UNSET_SIGS (nsigs, sigs, signal_print); | |
1513 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
1514 | } | |
1515 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
1516 | { | |
1517 | UNSET_SIGS (nsigs, sigs, signal_program); | |
1518 | } | |
1519 | else if (digits > 0) | |
bd5635a1 | 1520 | { |
072b552a JG |
1521 | sigfirst = siglast = atoi (*argv); |
1522 | if ((*argv)[digits] == '-') | |
bd5635a1 | 1523 | { |
072b552a | 1524 | siglast = atoi ((*argv) + digits + 1); |
bd5635a1 | 1525 | } |
072b552a | 1526 | if (sigfirst > siglast) |
bd5635a1 | 1527 | { |
072b552a JG |
1528 | /* Bet he didn't figure we'd think of this case... */ |
1529 | signum = sigfirst; | |
1530 | sigfirst = siglast; | |
1531 | siglast = signum; | |
bd5635a1 | 1532 | } |
072b552a JG |
1533 | if (sigfirst < 0 || sigfirst >= nsigs) |
1534 | { | |
1535 | error ("Signal %d not in range 0-%d", sigfirst, nsigs - 1); | |
1536 | } | |
1537 | if (siglast < 0 || siglast >= nsigs) | |
bd5635a1 | 1538 | { |
072b552a | 1539 | error ("Signal %d not in range 0-%d", siglast, nsigs - 1); |
bd5635a1 RP |
1540 | } |
1541 | } | |
072b552a | 1542 | else if ((signum = strtosigno (*argv)) != 0) |
bd5635a1 | 1543 | { |
072b552a | 1544 | sigfirst = siglast = signum; |
bd5635a1 | 1545 | } |
072b552a | 1546 | else |
bd5635a1 | 1547 | { |
072b552a JG |
1548 | /* Not a number and not a recognized flag word => complain. */ |
1549 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
bd5635a1 | 1550 | } |
072b552a JG |
1551 | |
1552 | /* If any signal numbers or symbol names were found, set flags for | |
1553 | which signals to apply actions to. */ | |
1554 | ||
1555 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
bd5635a1 | 1556 | { |
072b552a JG |
1557 | switch (signum) |
1558 | { | |
1559 | case SIGTRAP: | |
1560 | case SIGINT: | |
1561 | if (!allsigs && !sigs[signum]) | |
1562 | { | |
1563 | if (query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum))) | |
1564 | { | |
1565 | sigs[signum] = 1; | |
1566 | } | |
1567 | else | |
1568 | { | |
199b2450 TL |
1569 | printf_unfiltered ("Not confirmed, unchanged.\n"); |
1570 | gdb_flush (gdb_stdout); | |
072b552a JG |
1571 | } |
1572 | } | |
1573 | break; | |
1574 | default: | |
1575 | sigs[signum] = 1; | |
1576 | break; | |
1577 | } | |
bd5635a1 RP |
1578 | } |
1579 | ||
072b552a | 1580 | argv++; |
bd5635a1 RP |
1581 | } |
1582 | ||
de43d7d0 | 1583 | target_notice_signals(inferior_pid); |
cc221e76 | 1584 | |
bd5635a1 RP |
1585 | if (from_tty) |
1586 | { | |
1587 | /* Show the results. */ | |
1588 | sig_print_header (); | |
072b552a JG |
1589 | for (signum = 0; signum < nsigs; signum++) |
1590 | { | |
1591 | if (sigs[signum]) | |
1592 | { | |
1593 | sig_print_info (signum); | |
1594 | } | |
1595 | } | |
bd5635a1 | 1596 | } |
072b552a JG |
1597 | |
1598 | do_cleanups (old_chain); | |
bd5635a1 RP |
1599 | } |
1600 | ||
1601 | /* Print current contents of the tables set by the handle command. */ | |
1602 | ||
1603 | static void | |
e37a6e9c | 1604 | signals_info (signum_exp, from_tty) |
bd5635a1 | 1605 | char *signum_exp; |
e37a6e9c | 1606 | int from_tty; |
bd5635a1 RP |
1607 | { |
1608 | register int i; | |
1609 | sig_print_header (); | |
1610 | ||
1611 | if (signum_exp) | |
1612 | { | |
1613 | /* First see if this is a symbol name. */ | |
e37a6e9c PB |
1614 | i = strtosigno (signum_exp); |
1615 | if (i == 0) | |
bd5635a1 RP |
1616 | { |
1617 | /* Nope, maybe it's an address which evaluates to a signal | |
1618 | number. */ | |
1619 | i = parse_and_eval_address (signum_exp); | |
1620 | if (i >= NSIG || i < 0) | |
1621 | error ("Signal number out of bounds."); | |
1622 | } | |
1623 | sig_print_info (i); | |
1624 | return; | |
1625 | } | |
1626 | ||
1627 | printf_filtered ("\n"); | |
1628 | for (i = 0; i < NSIG; i++) | |
1629 | { | |
1630 | QUIT; | |
1631 | ||
1632 | sig_print_info (i); | |
1633 | } | |
1634 | ||
1635 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
1636 | } | |
1637 | \f | |
1638 | /* Save all of the information associated with the inferior<==>gdb | |
1639 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
1640 | (defined in inferior.h). */ | |
1641 | ||
1642 | void | |
1643 | save_inferior_status (inf_status, restore_stack_info) | |
1644 | struct inferior_status *inf_status; | |
1645 | int restore_stack_info; | |
1646 | { | |
bd5635a1 RP |
1647 | inf_status->stop_signal = stop_signal; |
1648 | inf_status->stop_pc = stop_pc; | |
1649 | inf_status->stop_frame_address = stop_frame_address; | |
1650 | inf_status->stop_step = stop_step; | |
1651 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
1652 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
1653 | inf_status->trap_expected = trap_expected; | |
1654 | inf_status->step_range_start = step_range_start; | |
1655 | inf_status->step_range_end = step_range_end; | |
1656 | inf_status->step_frame_address = step_frame_address; | |
1657 | inf_status->step_over_calls = step_over_calls; | |
bd5635a1 RP |
1658 | inf_status->stop_after_trap = stop_after_trap; |
1659 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
1660 | /* Save original bpstat chain here; replace it with copy of chain. | |
1661 | If caller's caller is walking the chain, they'll be happier if we | |
1662 | hand them back the original chain when restore_i_s is called. */ | |
1663 | inf_status->stop_bpstat = stop_bpstat; | |
1664 | stop_bpstat = bpstat_copy (stop_bpstat); | |
1665 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
1666 | inf_status->restore_stack_info = restore_stack_info; | |
1667 | inf_status->proceed_to_finish = proceed_to_finish; | |
1668 | ||
072b552a | 1669 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
37c99ddb JK |
1670 | |
1671 | read_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
1672 | ||
bd5635a1 RP |
1673 | record_selected_frame (&(inf_status->selected_frame_address), |
1674 | &(inf_status->selected_level)); | |
1675 | return; | |
1676 | } | |
1677 | ||
37c99ddb JK |
1678 | struct restore_selected_frame_args { |
1679 | FRAME_ADDR frame_address; | |
1680 | int level; | |
1681 | }; | |
1682 | ||
1683 | static int restore_selected_frame PARAMS ((char *)); | |
1684 | ||
1685 | /* Restore the selected frame. args is really a struct | |
1686 | restore_selected_frame_args * (declared as char * for catch_errors) | |
1687 | telling us what frame to restore. Returns 1 for success, or 0 for | |
1688 | failure. An error message will have been printed on error. */ | |
1689 | static int | |
1690 | restore_selected_frame (args) | |
1691 | char *args; | |
1692 | { | |
1693 | struct restore_selected_frame_args *fr = | |
1694 | (struct restore_selected_frame_args *) args; | |
1695 | FRAME fid; | |
1696 | int level = fr->level; | |
1697 | ||
1698 | fid = find_relative_frame (get_current_frame (), &level); | |
1699 | ||
1700 | /* If inf_status->selected_frame_address is NULL, there was no | |
1701 | previously selected frame. */ | |
1702 | if (fid == 0 || | |
1703 | FRAME_FP (fid) != fr->frame_address || | |
1704 | level != 0) | |
1705 | { | |
1706 | warning ("Unable to restore previously selected frame.\n"); | |
1707 | return 0; | |
1708 | } | |
1709 | select_frame (fid, fr->level); | |
1710 | return(1); | |
1711 | } | |
1712 | ||
bd5635a1 RP |
1713 | void |
1714 | restore_inferior_status (inf_status) | |
1715 | struct inferior_status *inf_status; | |
1716 | { | |
bd5635a1 RP |
1717 | stop_signal = inf_status->stop_signal; |
1718 | stop_pc = inf_status->stop_pc; | |
1719 | stop_frame_address = inf_status->stop_frame_address; | |
1720 | stop_step = inf_status->stop_step; | |
1721 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
1722 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
1723 | trap_expected = inf_status->trap_expected; | |
1724 | step_range_start = inf_status->step_range_start; | |
1725 | step_range_end = inf_status->step_range_end; | |
1726 | step_frame_address = inf_status->step_frame_address; | |
1727 | step_over_calls = inf_status->step_over_calls; | |
bd5635a1 RP |
1728 | stop_after_trap = inf_status->stop_after_trap; |
1729 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
1730 | bpstat_clear (&stop_bpstat); | |
1731 | stop_bpstat = inf_status->stop_bpstat; | |
1732 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
1733 | proceed_to_finish = inf_status->proceed_to_finish; | |
1734 | ||
072b552a | 1735 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
bd5635a1 RP |
1736 | |
1737 | /* The inferior can be gone if the user types "print exit(0)" | |
1738 | (and perhaps other times). */ | |
37c99ddb JK |
1739 | if (target_has_execution) |
1740 | write_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
1741 | ||
1742 | /* The inferior can be gone if the user types "print exit(0)" | |
1743 | (and perhaps other times). */ | |
1744 | ||
1745 | /* FIXME: If we are being called after stopping in a function which | |
1746 | is called from gdb, we should not be trying to restore the | |
1747 | selected frame; it just prints a spurious error message (The | |
1748 | message is useful, however, in detecting bugs in gdb (like if gdb | |
1749 | clobbers the stack)). In fact, should we be restoring the | |
1750 | inferior status at all in that case? . */ | |
1751 | ||
bd5635a1 RP |
1752 | if (target_has_stack && inf_status->restore_stack_info) |
1753 | { | |
37c99ddb JK |
1754 | struct restore_selected_frame_args fr; |
1755 | fr.level = inf_status->selected_level; | |
1756 | fr.frame_address = inf_status->selected_frame_address; | |
1757 | /* The point of catch_errors is that if the stack is clobbered, | |
1758 | walking the stack might encounter a garbage pointer and error() | |
1759 | trying to dereference it. */ | |
1760 | if (catch_errors (restore_selected_frame, &fr, | |
1761 | "Unable to restore previously selected frame:\n", | |
1762 | RETURN_MASK_ERROR) == 0) | |
1763 | /* Error in restoring the selected frame. Select the innermost | |
1764 | frame. */ | |
1765 | select_frame (get_current_frame (), 0); | |
bd5635a1 RP |
1766 | } |
1767 | } | |
1768 | ||
1769 | \f | |
1770 | void | |
1771 | _initialize_infrun () | |
1772 | { | |
1773 | register int i; | |
e37a6e9c | 1774 | register int numsigs; |
bd5635a1 RP |
1775 | |
1776 | add_info ("signals", signals_info, | |
1777 | "What debugger does when program gets various signals.\n\ | |
1778 | Specify a signal number as argument to print info on that signal only."); | |
6b50c5c2 | 1779 | add_info_alias ("handle", "signals", 0); |
bd5635a1 RP |
1780 | |
1781 | add_com ("handle", class_run, handle_command, | |
1782 | "Specify how to handle a signal.\n\ | |
072b552a JG |
1783 | Args are signal numbers and actions to apply to those signals.\n\ |
1784 | Signal numbers may be numeric (ex. 11) or symbolic (ex. SIGSEGV).\n\ | |
1785 | Numeric ranges may be specified with the form LOW-HIGH (ex. 14-21).\n\ | |
1786 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1787 | used by the debugger, typically SIGTRAP and SIGINT.\n\ | |
1788 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
1789 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ | |
bd5635a1 | 1790 | Stop means reenter debugger if this signal happens (implies print).\n\ |
072b552a | 1791 | Print means print a message if this signal happens.\n\ |
bd5635a1 | 1792 | Pass means let program see this signal; otherwise program doesn't know.\n\ |
072b552a | 1793 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
bd5635a1 RP |
1794 | Pass and Stop may be combined."); |
1795 | ||
a8a69e63 | 1796 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, |
3950a34e RP |
1797 | "There is no `stop' command, but you can set a hook on `stop'.\n\ |
1798 | This allows you to set a list of commands to be run each time execution\n\ | |
fee44494 | 1799 | of the program stops.", &cmdlist); |
3950a34e | 1800 | |
e37a6e9c | 1801 | numsigs = signo_max () + 1; |
072b552a JG |
1802 | signal_stop = (unsigned char *) |
1803 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
1804 | signal_print = (unsigned char *) | |
1805 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
1806 | signal_program = (unsigned char *) | |
1807 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
e37a6e9c | 1808 | for (i = 0; i < numsigs; i++) |
bd5635a1 RP |
1809 | { |
1810 | signal_stop[i] = 1; | |
1811 | signal_print[i] = 1; | |
1812 | signal_program[i] = 1; | |
1813 | } | |
1814 | ||
1815 | /* Signals caused by debugger's own actions | |
1816 | should not be given to the program afterwards. */ | |
1817 | signal_program[SIGTRAP] = 0; | |
1818 | signal_program[SIGINT] = 0; | |
1819 | ||
1820 | /* Signals that are not errors should not normally enter the debugger. */ | |
1821 | #ifdef SIGALRM | |
1822 | signal_stop[SIGALRM] = 0; | |
1823 | signal_print[SIGALRM] = 0; | |
1824 | #endif /* SIGALRM */ | |
1825 | #ifdef SIGVTALRM | |
1826 | signal_stop[SIGVTALRM] = 0; | |
1827 | signal_print[SIGVTALRM] = 0; | |
1828 | #endif /* SIGVTALRM */ | |
1829 | #ifdef SIGPROF | |
1830 | signal_stop[SIGPROF] = 0; | |
1831 | signal_print[SIGPROF] = 0; | |
1832 | #endif /* SIGPROF */ | |
1833 | #ifdef SIGCHLD | |
1834 | signal_stop[SIGCHLD] = 0; | |
1835 | signal_print[SIGCHLD] = 0; | |
1836 | #endif /* SIGCHLD */ | |
1837 | #ifdef SIGCLD | |
1838 | signal_stop[SIGCLD] = 0; | |
1839 | signal_print[SIGCLD] = 0; | |
1840 | #endif /* SIGCLD */ | |
1841 | #ifdef SIGIO | |
1842 | signal_stop[SIGIO] = 0; | |
1843 | signal_print[SIGIO] = 0; | |
1844 | #endif /* SIGIO */ | |
1845 | #ifdef SIGURG | |
1846 | signal_stop[SIGURG] = 0; | |
1847 | signal_print[SIGURG] = 0; | |
1848 | #endif /* SIGURG */ | |
1849 | } |