Commit | Line | Data |
---|---|---|
3aa6856a | 1 | /* Target-struct-independent code to start (run) and stop an inferior process. |
fcbc95a7 | 2 | Copyright 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994 |
101b7f9c | 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 | ||
67ac9759 | 51 | static void sig_print_info PARAMS ((enum target_signal)); |
30875e1c SG |
52 | |
53 | static void | |
54 | sig_print_header PARAMS ((void)); | |
55 | ||
30875e1c SG |
56 | static void |
57 | resume_cleanups PARAMS ((int)); | |
58 | ||
3950a34e RP |
59 | static int |
60 | hook_stop_stub PARAMS ((char *)); | |
61 | ||
30875e1c SG |
62 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
63 | program. It needs to examine the jmp_buf argument and extract the PC | |
64 | from it. The return value is non-zero on success, zero otherwise. */ | |
65 | #ifndef GET_LONGJMP_TARGET | |
66 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 | |
67 | #endif | |
68 | ||
d747e0af MT |
69 | |
70 | /* Some machines have trampoline code that sits between function callers | |
71 | and the actual functions themselves. If this machine doesn't have | |
72 | such things, disable their processing. */ | |
73 | #ifndef SKIP_TRAMPOLINE_CODE | |
74 | #define SKIP_TRAMPOLINE_CODE(pc) 0 | |
75 | #endif | |
76 | ||
1eeba686 | 77 | /* For SVR4 shared libraries, each call goes through a small piece of |
2fe3b329 | 78 | trampoline code in the ".plt" section. IN_SOLIB_TRAMPOLINE evaluates |
1eeba686 PB |
79 | to nonzero if we are current stopped in one of these. */ |
80 | #ifndef IN_SOLIB_TRAMPOLINE | |
81 | #define IN_SOLIB_TRAMPOLINE(pc,name) 0 | |
82 | #endif | |
d747e0af | 83 | |
9f739abd SG |
84 | /* On some systems, the PC may be left pointing at an instruction that won't |
85 | actually be executed. This is usually indicated by a bit in the PSW. If | |
86 | we find ourselves in such a state, then we step the target beyond the | |
87 | nullified instruction before returning control to the user so as to avoid | |
88 | confusion. */ | |
89 | ||
90 | #ifndef INSTRUCTION_NULLIFIED | |
91 | #define INSTRUCTION_NULLIFIED 0 | |
92 | #endif | |
93 | ||
bd5635a1 RP |
94 | /* Tables of how to react to signals; the user sets them. */ |
95 | ||
072b552a JG |
96 | static unsigned char *signal_stop; |
97 | static unsigned char *signal_print; | |
98 | static unsigned char *signal_program; | |
99 | ||
100 | #define SET_SIGS(nsigs,sigs,flags) \ | |
101 | do { \ | |
102 | int signum = (nsigs); \ | |
103 | while (signum-- > 0) \ | |
104 | if ((sigs)[signum]) \ | |
105 | (flags)[signum] = 1; \ | |
106 | } while (0) | |
107 | ||
108 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
109 | do { \ | |
110 | int signum = (nsigs); \ | |
111 | while (signum-- > 0) \ | |
112 | if ((sigs)[signum]) \ | |
113 | (flags)[signum] = 0; \ | |
114 | } while (0) | |
bd5635a1 | 115 | |
3950a34e RP |
116 | |
117 | /* Command list pointer for the "stop" placeholder. */ | |
118 | ||
119 | static struct cmd_list_element *stop_command; | |
120 | ||
bd5635a1 | 121 | /* Nonzero if breakpoints are now inserted in the inferior. */ |
bd5635a1 | 122 | |
3950a34e | 123 | static int breakpoints_inserted; |
bd5635a1 RP |
124 | |
125 | /* Function inferior was in as of last step command. */ | |
126 | ||
127 | static struct symbol *step_start_function; | |
128 | ||
bd5635a1 RP |
129 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ |
130 | ||
131 | static int trap_expected; | |
132 | ||
133 | /* Nonzero if the next time we try to continue the inferior, it will | |
134 | step one instruction and generate a spurious trace trap. | |
135 | This is used to compensate for a bug in HP-UX. */ | |
136 | ||
137 | static int trap_expected_after_continue; | |
138 | ||
139 | /* Nonzero means expecting a trace trap | |
140 | and should stop the inferior and return silently when it happens. */ | |
141 | ||
142 | int stop_after_trap; | |
143 | ||
144 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
145 | It is used after attach, due to attaching to a process; | |
146 | when running in the shell before the child program has been exec'd; | |
147 | and when running some kinds of remote stuff (FIXME?). */ | |
148 | ||
149 | int stop_soon_quietly; | |
150 | ||
bd5635a1 RP |
151 | /* Nonzero if proceed is being used for a "finish" command or a similar |
152 | situation when stop_registers should be saved. */ | |
153 | ||
154 | int proceed_to_finish; | |
155 | ||
156 | /* Save register contents here when about to pop a stack dummy frame, | |
157 | if-and-only-if proceed_to_finish is set. | |
158 | Thus this contains the return value from the called function (assuming | |
159 | values are returned in a register). */ | |
160 | ||
161 | char stop_registers[REGISTER_BYTES]; | |
162 | ||
163 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
164 | ||
165 | static int breakpoints_failed; | |
166 | ||
167 | /* Nonzero after stop if current stack frame should be printed. */ | |
168 | ||
169 | static int stop_print_frame; | |
170 | ||
171 | #ifdef NO_SINGLE_STEP | |
172 | extern int one_stepped; /* From machine dependent code */ | |
173 | extern void single_step (); /* Same. */ | |
174 | #endif /* NO_SINGLE_STEP */ | |
175 | ||
a71d17b1 JK |
176 | \f |
177 | /* Things to clean up if we QUIT out of resume (). */ | |
e1ce8aa5 | 178 | /* ARGSUSED */ |
a71d17b1 JK |
179 | static void |
180 | resume_cleanups (arg) | |
181 | int arg; | |
182 | { | |
183 | normal_stop (); | |
184 | } | |
185 | ||
186 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
187 | wants to interrupt some lengthy single-stepping operation | |
188 | (for child processes, the SIGINT goes to the inferior, and so | |
189 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
190 | other targets, that's not true). | |
191 | ||
192 | STEP nonzero if we should step (zero to continue instead). | |
193 | SIG is the signal to give the inferior (zero for none). */ | |
310cc570 | 194 | void |
a71d17b1 JK |
195 | resume (step, sig) |
196 | int step; | |
67ac9759 | 197 | enum target_signal sig; |
a71d17b1 JK |
198 | { |
199 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
200 | QUIT; | |
d11c44f1 | 201 | |
cef4c2e7 PS |
202 | #ifdef CANNOT_STEP_BREAKPOINT |
203 | /* Most targets can step a breakpoint instruction, thus executing it | |
204 | normally. But if this one cannot, just continue and we will hit | |
205 | it anyway. */ | |
206 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
207 | step = 0; | |
208 | #endif | |
209 | ||
d11c44f1 JG |
210 | #ifdef NO_SINGLE_STEP |
211 | if (step) { | |
818de002 | 212 | single_step(sig); /* Do it the hard way, w/temp breakpoints */ |
d11c44f1 JG |
213 | step = 0; /* ...and don't ask hardware to do it. */ |
214 | } | |
215 | #endif | |
216 | ||
bdbd5f50 JG |
217 | /* Handle any optimized stores to the inferior NOW... */ |
218 | #ifdef DO_DEFERRED_STORES | |
219 | DO_DEFERRED_STORES; | |
220 | #endif | |
221 | ||
2f1c7c3f JK |
222 | /* Install inferior's terminal modes. */ |
223 | target_terminal_inferior (); | |
224 | ||
de43d7d0 | 225 | target_resume (-1, step, sig); |
a71d17b1 JK |
226 | discard_cleanups (old_cleanups); |
227 | } | |
228 | ||
bd5635a1 RP |
229 | \f |
230 | /* Clear out all variables saying what to do when inferior is continued. | |
231 | First do this, then set the ones you want, then call `proceed'. */ | |
232 | ||
233 | void | |
234 | clear_proceed_status () | |
235 | { | |
236 | trap_expected = 0; | |
237 | step_range_start = 0; | |
238 | step_range_end = 0; | |
239 | step_frame_address = 0; | |
240 | step_over_calls = -1; | |
bd5635a1 RP |
241 | stop_after_trap = 0; |
242 | stop_soon_quietly = 0; | |
243 | proceed_to_finish = 0; | |
244 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
245 | ||
246 | /* Discard any remaining commands or status from previous stop. */ | |
247 | bpstat_clear (&stop_bpstat); | |
248 | } | |
249 | ||
250 | /* Basic routine for continuing the program in various fashions. | |
251 | ||
252 | ADDR is the address to resume at, or -1 for resume where stopped. | |
253 | SIGGNAL is the signal to give it, or 0 for none, | |
254 | or -1 for act according to how it stopped. | |
255 | STEP is nonzero if should trap after one instruction. | |
256 | -1 means return after that and print nothing. | |
257 | You should probably set various step_... variables | |
258 | before calling here, if you are stepping. | |
259 | ||
260 | You should call clear_proceed_status before calling proceed. */ | |
261 | ||
262 | void | |
263 | proceed (addr, siggnal, step) | |
264 | CORE_ADDR addr; | |
67ac9759 | 265 | enum target_signal siggnal; |
bd5635a1 RP |
266 | int step; |
267 | { | |
268 | int oneproc = 0; | |
269 | ||
270 | if (step > 0) | |
271 | step_start_function = find_pc_function (read_pc ()); | |
272 | if (step < 0) | |
273 | stop_after_trap = 1; | |
274 | ||
bdbd5f50 | 275 | if (addr == (CORE_ADDR)-1) |
bd5635a1 RP |
276 | { |
277 | /* If there is a breakpoint at the address we will resume at, | |
278 | step one instruction before inserting breakpoints | |
279 | so that we do not stop right away. */ | |
280 | ||
37c99ddb | 281 | if (breakpoint_here_p (read_pc ())) |
bd5635a1 | 282 | oneproc = 1; |
b5aff268 JK |
283 | |
284 | #ifdef STEP_SKIPS_DELAY | |
285 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
286 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY | |
287 | is slow (it needs to read memory from the target). */ | |
288 | if (breakpoint_here_p (read_pc () + 4) | |
289 | && STEP_SKIPS_DELAY (read_pc ())) | |
290 | oneproc = 1; | |
291 | #endif /* STEP_SKIPS_DELAY */ | |
bd5635a1 RP |
292 | } |
293 | else | |
101b7f9c | 294 | write_pc (addr); |
bd5635a1 RP |
295 | |
296 | if (trap_expected_after_continue) | |
297 | { | |
298 | /* If (step == 0), a trap will be automatically generated after | |
299 | the first instruction is executed. Force step one | |
300 | instruction to clear this condition. This should not occur | |
301 | if step is nonzero, but it is harmless in that case. */ | |
302 | oneproc = 1; | |
303 | trap_expected_after_continue = 0; | |
304 | } | |
305 | ||
306 | if (oneproc) | |
307 | /* We will get a trace trap after one instruction. | |
308 | Continue it automatically and insert breakpoints then. */ | |
309 | trap_expected = 1; | |
310 | else | |
311 | { | |
312 | int temp = insert_breakpoints (); | |
313 | if (temp) | |
314 | { | |
315 | print_sys_errmsg ("ptrace", temp); | |
316 | error ("Cannot insert breakpoints.\n\ | |
317 | The same program may be running in another process."); | |
318 | } | |
319 | breakpoints_inserted = 1; | |
320 | } | |
321 | ||
fcbc95a7 | 322 | if (siggnal != TARGET_SIGNAL_DEFAULT) |
bd5635a1 RP |
323 | stop_signal = siggnal; |
324 | /* If this signal should not be seen by program, | |
325 | give it zero. Used for debugging signals. */ | |
67ac9759 | 326 | else if (!signal_program[stop_signal]) |
fcbc95a7 | 327 | stop_signal = TARGET_SIGNAL_0; |
bd5635a1 | 328 | |
bd5635a1 | 329 | /* Resume inferior. */ |
a71d17b1 | 330 | resume (oneproc || step || bpstat_should_step (), stop_signal); |
bd5635a1 RP |
331 | |
332 | /* Wait for it to stop (if not standalone) | |
333 | and in any case decode why it stopped, and act accordingly. */ | |
334 | ||
335 | wait_for_inferior (); | |
336 | normal_stop (); | |
337 | } | |
338 | ||
bd5635a1 RP |
339 | /* Record the pc and sp of the program the last time it stopped. |
340 | These are just used internally by wait_for_inferior, but need | |
341 | to be preserved over calls to it and cleared when the inferior | |
342 | is started. */ | |
343 | static CORE_ADDR prev_pc; | |
344 | static CORE_ADDR prev_sp; | |
345 | static CORE_ADDR prev_func_start; | |
346 | static char *prev_func_name; | |
bcc37718 | 347 | static CORE_ADDR prev_frame_address; |
bd5635a1 | 348 | |
a71d17b1 | 349 | \f |
bd5635a1 RP |
350 | /* Start remote-debugging of a machine over a serial link. */ |
351 | ||
352 | void | |
353 | start_remote () | |
354 | { | |
355 | init_wait_for_inferior (); | |
356 | clear_proceed_status (); | |
357 | stop_soon_quietly = 1; | |
358 | trap_expected = 0; | |
98885d76 JK |
359 | wait_for_inferior (); |
360 | normal_stop (); | |
bd5635a1 RP |
361 | } |
362 | ||
363 | /* Initialize static vars when a new inferior begins. */ | |
364 | ||
365 | void | |
366 | init_wait_for_inferior () | |
367 | { | |
368 | /* These are meaningless until the first time through wait_for_inferior. */ | |
369 | prev_pc = 0; | |
370 | prev_sp = 0; | |
371 | prev_func_start = 0; | |
372 | prev_func_name = NULL; | |
bcc37718 | 373 | prev_frame_address = 0; |
bd5635a1 RP |
374 | |
375 | trap_expected_after_continue = 0; | |
376 | breakpoints_inserted = 0; | |
cf3e377e | 377 | breakpoint_init_inferior (); |
67ac9759 JK |
378 | |
379 | /* Don't confuse first call to proceed(). */ | |
380 | stop_signal = TARGET_SIGNAL_0; | |
bd5635a1 RP |
381 | } |
382 | ||
fe675038 JK |
383 | static void |
384 | delete_breakpoint_current_contents (arg) | |
385 | PTR arg; | |
386 | { | |
387 | struct breakpoint **breakpointp = (struct breakpoint **)arg; | |
388 | if (*breakpointp != NULL) | |
389 | delete_breakpoint (*breakpointp); | |
390 | } | |
bd5635a1 RP |
391 | \f |
392 | /* Wait for control to return from inferior to debugger. | |
393 | If inferior gets a signal, we may decide to start it up again | |
394 | instead of returning. That is why there is a loop in this function. | |
395 | When this function actually returns it means the inferior | |
396 | should be left stopped and GDB should read more commands. */ | |
397 | ||
398 | void | |
399 | wait_for_inferior () | |
400 | { | |
fe675038 | 401 | struct cleanup *old_cleanups; |
67ac9759 | 402 | struct target_waitstatus w; |
bd5635a1 RP |
403 | int another_trap; |
404 | int random_signal; | |
37c99ddb | 405 | CORE_ADDR stop_sp = 0; |
bd5635a1 | 406 | CORE_ADDR stop_func_start; |
67ac9759 | 407 | CORE_ADDR stop_func_end; |
bd5635a1 | 408 | char *stop_func_name; |
37c99ddb | 409 | CORE_ADDR prologue_pc = 0, tmp; |
bd5635a1 RP |
410 | struct symtab_and_line sal; |
411 | int remove_breakpoints_on_following_step = 0; | |
b3b39c0c | 412 | int current_line; |
b2f03c30 | 413 | struct symtab *current_symtab; |
30875e1c | 414 | int handling_longjmp = 0; /* FIXME */ |
fe675038 | 415 | struct breakpoint *step_resume_breakpoint = NULL; |
bcc37718 | 416 | struct breakpoint *through_sigtramp_breakpoint = NULL; |
37c99ddb | 417 | int pid; |
bd5635a1 | 418 | |
fe675038 JK |
419 | old_cleanups = make_cleanup (delete_breakpoint_current_contents, |
420 | &step_resume_breakpoint); | |
bcc37718 JK |
421 | make_cleanup (delete_breakpoint_current_contents, |
422 | &through_sigtramp_breakpoint); | |
b3b39c0c SG |
423 | sal = find_pc_line(prev_pc, 0); |
424 | current_line = sal.line; | |
b2f03c30 | 425 | current_symtab = sal.symtab; |
b3b39c0c | 426 | |
cb6b0202 | 427 | /* Are we stepping? */ |
bcc37718 JK |
428 | #define CURRENTLY_STEPPING() \ |
429 | ((through_sigtramp_breakpoint == NULL \ | |
430 | && !handling_longjmp \ | |
431 | && ((step_range_end && step_resume_breakpoint == NULL) \ | |
432 | || trap_expected)) \ | |
433 | || bpstat_should_step ()) | |
cb6b0202 | 434 | |
bd5635a1 RP |
435 | while (1) |
436 | { | |
437 | /* Clean up saved state that will become invalid. */ | |
bd5635a1 RP |
438 | flush_cached_frames (); |
439 | registers_changed (); | |
440 | ||
de43d7d0 | 441 | pid = target_wait (-1, &w); |
bd5635a1 | 442 | |
fcbc95a7 JK |
443 | switch (w.kind) |
444 | { | |
445 | case TARGET_WAITKIND_LOADED: | |
446 | /* Ignore it gracefully. */ | |
447 | if (breakpoints_inserted) | |
448 | { | |
449 | mark_breakpoints_out (); | |
450 | insert_breakpoints (); | |
451 | } | |
452 | resume (0, TARGET_SIGNAL_0); | |
453 | continue; | |
1eeba686 | 454 | |
fcbc95a7 JK |
455 | case TARGET_WAITKIND_SPURIOUS: |
456 | resume (0, TARGET_SIGNAL_0); | |
457 | continue; | |
1eeba686 | 458 | |
fcbc95a7 | 459 | case TARGET_WAITKIND_EXITED: |
bd5635a1 | 460 | target_terminal_ours (); /* Must do this before mourn anyway */ |
67ac9759 | 461 | if (w.value.integer) |
e37a6e9c | 462 | printf_filtered ("\nProgram exited with code 0%o.\n", |
67ac9759 | 463 | (unsigned int)w.value.integer); |
bd5635a1 RP |
464 | else |
465 | if (!batch_mode()) | |
e37a6e9c | 466 | printf_filtered ("\nProgram exited normally.\n"); |
199b2450 | 467 | gdb_flush (gdb_stdout); |
bd5635a1 RP |
468 | target_mourn_inferior (); |
469 | #ifdef NO_SINGLE_STEP | |
470 | one_stepped = 0; | |
471 | #endif | |
472 | stop_print_frame = 0; | |
fcbc95a7 | 473 | goto stop_stepping; |
67ac9759 | 474 | |
fcbc95a7 | 475 | case TARGET_WAITKIND_SIGNALLED: |
bd5635a1 | 476 | stop_print_frame = 0; |
67ac9759 | 477 | stop_signal = w.value.sig; |
bd5635a1 | 478 | target_terminal_ours (); /* Must do this before mourn anyway */ |
30875e1c | 479 | target_kill (); /* kill mourns as well */ |
67ac9759 JK |
480 | printf_filtered ("\nProgram terminated with signal %s, %s.\n", |
481 | target_signal_to_name (stop_signal), | |
482 | target_signal_to_string (stop_signal)); | |
483 | ||
fee44494 | 484 | printf_filtered ("The program no longer exists.\n"); |
199b2450 | 485 | gdb_flush (gdb_stdout); |
bd5635a1 RP |
486 | #ifdef NO_SINGLE_STEP |
487 | one_stepped = 0; | |
488 | #endif | |
fcbc95a7 JK |
489 | goto stop_stepping; |
490 | ||
491 | case TARGET_WAITKIND_STOPPED: | |
492 | /* This is the only case in which we keep going; the above cases | |
493 | end in a continue or goto. */ | |
bd5635a1 RP |
494 | break; |
495 | } | |
de43d7d0 | 496 | |
67ac9759 | 497 | stop_signal = w.value.sig; |
de43d7d0 SG |
498 | |
499 | if (pid != inferior_pid) | |
500 | { | |
501 | int save_pid = inferior_pid; | |
502 | ||
503 | inferior_pid = pid; /* Setup for target memory/regs */ | |
504 | registers_changed (); | |
505 | stop_pc = read_pc (); | |
506 | inferior_pid = save_pid; | |
507 | registers_changed (); | |
508 | } | |
509 | else | |
510 | stop_pc = read_pc (); | |
511 | ||
67ac9759 | 512 | if (stop_signal == TARGET_SIGNAL_TRAP |
de43d7d0 | 513 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) |
b2f03c30 JK |
514 | { |
515 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, pid)) | |
516 | { | |
517 | /* Saw a breakpoint, but it was hit by the wrong thread. Just continue. */ | |
518 | if (breakpoints_inserted) | |
519 | { | |
520 | if (pid != inferior_pid) | |
521 | { | |
522 | int save_pid = inferior_pid; | |
523 | ||
524 | inferior_pid = pid; | |
525 | registers_changed (); | |
526 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
527 | inferior_pid = save_pid; | |
528 | registers_changed (); | |
529 | } | |
530 | else | |
531 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
532 | ||
533 | remove_breakpoints (); | |
67ac9759 | 534 | target_resume (pid, 1, TARGET_SIGNAL_0); /* Single step */ |
b2f03c30 JK |
535 | /* FIXME: What if a signal arrives instead of the single-step |
536 | happening? */ | |
537 | target_wait (pid, &w); | |
538 | insert_breakpoints (); | |
539 | } | |
67ac9759 | 540 | target_resume (-1, 0, TARGET_SIGNAL_0); |
b2f03c30 JK |
541 | continue; |
542 | } | |
543 | else | |
544 | if (pid != inferior_pid) | |
545 | goto switch_thread; | |
546 | } | |
de43d7d0 | 547 | |
37c99ddb JK |
548 | if (pid != inferior_pid) |
549 | { | |
550 | int printed = 0; | |
551 | ||
552 | if (!in_thread_list (pid)) | |
553 | { | |
199b2450 | 554 | fprintf_unfiltered (gdb_stderr, "[New %s]\n", target_pid_to_str (pid)); |
37c99ddb JK |
555 | add_thread (pid); |
556 | ||
67ac9759 | 557 | target_resume (-1, 0, TARGET_SIGNAL_0); |
37c99ddb JK |
558 | continue; |
559 | } | |
560 | else | |
561 | { | |
67ac9759 | 562 | if (signal_print[stop_signal]) |
37c99ddb JK |
563 | { |
564 | char *signame; | |
565 | ||
566 | printed = 1; | |
567 | target_terminal_ours_for_output (); | |
67ac9759 JK |
568 | printf_filtered ("\nProgram received signal %s, %s.\n", |
569 | target_signal_to_name (stop_signal), | |
570 | target_signal_to_string (stop_signal)); | |
199b2450 | 571 | gdb_flush (gdb_stdout); |
37c99ddb JK |
572 | } |
573 | ||
67ac9759 | 574 | if (stop_signal == TARGET_SIGNAL_TRAP |
de43d7d0 | 575 | || signal_stop[stop_signal]) |
37c99ddb | 576 | { |
de43d7d0 | 577 | switch_thread: |
37c99ddb JK |
578 | inferior_pid = pid; |
579 | printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid)); | |
580 | ||
581 | flush_cached_frames (); | |
582 | registers_changed (); | |
583 | trap_expected = 0; | |
584 | if (step_resume_breakpoint) | |
585 | { | |
586 | delete_breakpoint (step_resume_breakpoint); | |
587 | step_resume_breakpoint = NULL; | |
588 | } | |
bcc37718 JK |
589 | |
590 | /* Not sure whether we need to blow this away too, | |
591 | but probably it is like the step-resume | |
592 | breakpoint. */ | |
593 | if (through_sigtramp_breakpoint) | |
594 | { | |
595 | delete_breakpoint (through_sigtramp_breakpoint); | |
596 | through_sigtramp_breakpoint = NULL; | |
597 | } | |
37c99ddb JK |
598 | prev_pc = 0; |
599 | prev_sp = 0; | |
600 | prev_func_name = NULL; | |
601 | step_range_start = 0; | |
602 | step_range_end = 0; | |
603 | step_frame_address = 0; | |
604 | handling_longjmp = 0; | |
605 | another_trap = 0; | |
606 | } | |
607 | else | |
608 | { | |
609 | if (printed) | |
610 | target_terminal_inferior (); | |
611 | ||
612 | /* Clear the signal if it should not be passed. */ | |
613 | if (signal_program[stop_signal] == 0) | |
67ac9759 | 614 | stop_signal = TARGET_SIGNAL_0; |
37c99ddb | 615 | |
b2f03c30 | 616 | target_resume (pid, 0, stop_signal); |
37c99ddb JK |
617 | continue; |
618 | } | |
619 | } | |
620 | } | |
621 | ||
bd5635a1 RP |
622 | #ifdef NO_SINGLE_STEP |
623 | if (one_stepped) | |
624 | single_step (0); /* This actually cleans up the ss */ | |
625 | #endif /* NO_SINGLE_STEP */ | |
626 | ||
999dd04b JL |
627 | /* If PC is pointing at a nullified instruction, then step beyond |
628 | it so that the user won't be confused when GDB appears to be ready | |
629 | to execute it. */ | |
9f739abd SG |
630 | |
631 | if (INSTRUCTION_NULLIFIED) | |
632 | { | |
633 | resume (1, 0); | |
634 | continue; | |
635 | } | |
636 | ||
999dd04b JL |
637 | set_current_frame (create_new_frame (read_fp (), stop_pc)); |
638 | select_frame (get_current_frame (), 0); | |
639 | ||
640 | #ifdef HAVE_STEPPABLE_WATCHPOINT | |
641 | /* It may not be necessary to disable the watchpoint to stop over | |
642 | it. For example, the PA can (with some kernel cooperation) | |
643 | single step over a watchpoint without disabling the watchpoint. */ | |
644 | if (STOPPED_BY_WATCHPOINT (w)) | |
645 | { | |
646 | resume (1, 0); | |
647 | continue; | |
648 | } | |
649 | #endif | |
650 | ||
651 | #ifdef HAVE_NONSTEPPABLE_WATCHPOINT | |
652 | /* It is far more common to need to disable a watchpoint | |
653 | to step the inferior over it. FIXME. What else might | |
654 | a debug register or page protection watchpoint scheme need | |
655 | here? */ | |
656 | if (STOPPED_BY_WATCHPOINT (w)) | |
657 | { | |
658 | remove_breakpoints (); | |
659 | resume (1, 0); | |
660 | insert_breakpoints (); | |
661 | continue; | |
662 | } | |
663 | #endif | |
fe675038 | 664 | |
bd5635a1 | 665 | stop_frame_address = FRAME_FP (get_current_frame ()); |
fee44494 | 666 | stop_sp = read_sp (); |
bd5635a1 RP |
667 | stop_func_start = 0; |
668 | stop_func_name = 0; | |
669 | /* Don't care about return value; stop_func_start and stop_func_name | |
670 | will both be 0 if it doesn't work. */ | |
37c99ddb | 671 | find_pc_partial_function (stop_pc, &stop_func_name, &stop_func_start, |
67ac9759 | 672 | &stop_func_end); |
bd5635a1 RP |
673 | stop_func_start += FUNCTION_START_OFFSET; |
674 | another_trap = 0; | |
675 | bpstat_clear (&stop_bpstat); | |
676 | stop_step = 0; | |
677 | stop_stack_dummy = 0; | |
678 | stop_print_frame = 1; | |
bd5635a1 RP |
679 | random_signal = 0; |
680 | stopped_by_random_signal = 0; | |
681 | breakpoints_failed = 0; | |
682 | ||
683 | /* Look at the cause of the stop, and decide what to do. | |
684 | The alternatives are: | |
685 | 1) break; to really stop and return to the debugger, | |
686 | 2) drop through to start up again | |
687 | (set another_trap to 1 to single step once) | |
688 | 3) set random_signal to 1, and the decision between 1 and 2 | |
689 | will be made according to the signal handling tables. */ | |
690 | ||
bd5635a1 RP |
691 | /* First, distinguish signals caused by the debugger from signals |
692 | that have to do with the program's own actions. | |
693 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
694 | or SIGEMT, depending on the operating system version. | |
695 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
696 | and change it to SIGTRAP. */ | |
697 | ||
67ac9759 | 698 | if (stop_signal == TARGET_SIGNAL_TRAP |
bd5635a1 | 699 | || (breakpoints_inserted && |
67ac9759 JK |
700 | (stop_signal == TARGET_SIGNAL_ILL |
701 | || stop_signal == TARGET_SIGNAL_EMT | |
e37a6e9c | 702 | )) |
bd5635a1 RP |
703 | || stop_soon_quietly) |
704 | { | |
67ac9759 | 705 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) |
bd5635a1 RP |
706 | { |
707 | stop_print_frame = 0; | |
708 | break; | |
709 | } | |
710 | if (stop_soon_quietly) | |
711 | break; | |
712 | ||
713 | /* Don't even think about breakpoints | |
714 | if just proceeded over a breakpoint. | |
715 | ||
716 | However, if we are trying to proceed over a breakpoint | |
bcc37718 | 717 | and end up in sigtramp, then through_sigtramp_breakpoint |
bd5635a1 RP |
718 | will be set and we should check whether we've hit the |
719 | step breakpoint. */ | |
67ac9759 | 720 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected |
bcc37718 | 721 | && through_sigtramp_breakpoint == NULL) |
bd5635a1 RP |
722 | bpstat_clear (&stop_bpstat); |
723 | else | |
724 | { | |
725 | /* See if there is a breakpoint at the current PC. */ | |
cb6b0202 JK |
726 | stop_bpstat = bpstat_stop_status |
727 | (&stop_pc, stop_frame_address, | |
bd5635a1 | 728 | #if DECR_PC_AFTER_BREAK |
cb6b0202 JK |
729 | /* Notice the case of stepping through a jump |
730 | that lands just after a breakpoint. | |
731 | Don't confuse that with hitting the breakpoint. | |
732 | What we check for is that 1) stepping is going on | |
733 | and 2) the pc before the last insn does not match | |
734 | the address of the breakpoint before the current pc. */ | |
735 | (prev_pc != stop_pc - DECR_PC_AFTER_BREAK | |
736 | && CURRENTLY_STEPPING ()) | |
737 | #else /* DECR_PC_AFTER_BREAK zero */ | |
738 | 0 | |
739 | #endif /* DECR_PC_AFTER_BREAK zero */ | |
740 | ); | |
741 | /* Following in case break condition called a | |
742 | function. */ | |
743 | stop_print_frame = 1; | |
bd5635a1 | 744 | } |
fe675038 | 745 | |
67ac9759 | 746 | if (stop_signal == TARGET_SIGNAL_TRAP) |
bd5635a1 RP |
747 | random_signal |
748 | = !(bpstat_explains_signal (stop_bpstat) | |
749 | || trap_expected | |
84d59861 | 750 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
bd5635a1 | 751 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) |
84d59861 | 752 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
fe675038 | 753 | || (step_range_end && step_resume_breakpoint == NULL)); |
bd5635a1 RP |
754 | else |
755 | { | |
756 | random_signal | |
757 | = !(bpstat_explains_signal (stop_bpstat) | |
bd5635a1 RP |
758 | /* End of a stack dummy. Some systems (e.g. Sony |
759 | news) give another signal besides SIGTRAP, | |
760 | so check here as well as above. */ | |
84d59861 | 761 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
d747e0af | 762 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) |
84d59861 | 763 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
bd5635a1 RP |
764 | ); |
765 | if (!random_signal) | |
67ac9759 | 766 | stop_signal = TARGET_SIGNAL_TRAP; |
bd5635a1 RP |
767 | } |
768 | } | |
769 | else | |
770 | random_signal = 1; | |
fe675038 | 771 | |
bd5635a1 RP |
772 | /* For the program's own signals, act according to |
773 | the signal handling tables. */ | |
fe675038 | 774 | |
bd5635a1 RP |
775 | if (random_signal) |
776 | { | |
777 | /* Signal not for debugging purposes. */ | |
778 | int printed = 0; | |
779 | ||
780 | stopped_by_random_signal = 1; | |
781 | ||
67ac9759 | 782 | if (signal_print[stop_signal]) |
bd5635a1 | 783 | { |
fee44494 | 784 | char *signame; |
bd5635a1 RP |
785 | printed = 1; |
786 | target_terminal_ours_for_output (); | |
67ac9759 JK |
787 | printf_filtered ("\nProgram received signal %s, %s.\n", |
788 | target_signal_to_name (stop_signal), | |
789 | target_signal_to_string (stop_signal)); | |
199b2450 | 790 | gdb_flush (gdb_stdout); |
bd5635a1 | 791 | } |
67ac9759 | 792 | if (signal_stop[stop_signal]) |
bd5635a1 RP |
793 | break; |
794 | /* If not going to stop, give terminal back | |
795 | if we took it away. */ | |
796 | else if (printed) | |
797 | target_terminal_inferior (); | |
b7f81b57 | 798 | |
101b7f9c PS |
799 | /* Clear the signal if it should not be passed. */ |
800 | if (signal_program[stop_signal] == 0) | |
67ac9759 | 801 | stop_signal = TARGET_SIGNAL_0; |
101b7f9c | 802 | |
fe675038 JK |
803 | /* I'm not sure whether this needs to be check_sigtramp2 or |
804 | whether it could/should be keep_going. */ | |
805 | goto check_sigtramp2; | |
bd5635a1 | 806 | } |
30875e1c | 807 | |
bd5635a1 | 808 | /* Handle cases caused by hitting a breakpoint. */ |
fe675038 JK |
809 | { |
810 | CORE_ADDR jmp_buf_pc; | |
29c6dce2 JK |
811 | struct bpstat_what what; |
812 | ||
813 | what = bpstat_what (stop_bpstat); | |
bd5635a1 | 814 | |
84d59861 JK |
815 | if (what.call_dummy) |
816 | { | |
817 | stop_stack_dummy = 1; | |
818 | #ifdef HP_OS_BUG | |
819 | trap_expected_after_continue = 1; | |
820 | #endif | |
821 | } | |
822 | ||
fe675038 JK |
823 | switch (what.main_action) |
824 | { | |
825 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
826 | /* If we hit the breakpoint at longjmp, disable it for the | |
827 | duration of this command. Then, install a temporary | |
828 | breakpoint at the target of the jmp_buf. */ | |
829 | disable_longjmp_breakpoint(); | |
830 | remove_breakpoints (); | |
831 | breakpoints_inserted = 0; | |
832 | if (!GET_LONGJMP_TARGET(&jmp_buf_pc)) goto keep_going; | |
833 | ||
834 | /* Need to blow away step-resume breakpoint, as it | |
835 | interferes with us */ | |
836 | if (step_resume_breakpoint != NULL) | |
837 | { | |
838 | delete_breakpoint (step_resume_breakpoint); | |
839 | step_resume_breakpoint = NULL; | |
bcc37718 JK |
840 | } |
841 | /* Not sure whether we need to blow this away too, but probably | |
842 | it is like the step-resume breakpoint. */ | |
843 | if (through_sigtramp_breakpoint != NULL) | |
844 | { | |
845 | delete_breakpoint (through_sigtramp_breakpoint); | |
846 | through_sigtramp_breakpoint = NULL; | |
fe675038 | 847 | } |
30875e1c | 848 | |
101b7f9c | 849 | #if 0 |
fe675038 JK |
850 | /* FIXME - Need to implement nested temporary breakpoints */ |
851 | if (step_over_calls > 0) | |
852 | set_longjmp_resume_breakpoint(jmp_buf_pc, | |
853 | get_current_frame()); | |
854 | else | |
30875e1c | 855 | #endif /* 0 */ |
fe675038 JK |
856 | set_longjmp_resume_breakpoint(jmp_buf_pc, NULL); |
857 | handling_longjmp = 1; /* FIXME */ | |
858 | goto keep_going; | |
859 | ||
860 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: | |
861 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
862 | remove_breakpoints (); | |
863 | breakpoints_inserted = 0; | |
101b7f9c | 864 | #if 0 |
fe675038 JK |
865 | /* FIXME - Need to implement nested temporary breakpoints */ |
866 | if (step_over_calls | |
867 | && (stop_frame_address | |
868 | INNER_THAN step_frame_address)) | |
869 | { | |
870 | another_trap = 1; | |
871 | goto keep_going; | |
872 | } | |
30875e1c | 873 | #endif /* 0 */ |
fe675038 JK |
874 | disable_longjmp_breakpoint(); |
875 | handling_longjmp = 0; /* FIXME */ | |
876 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
101b7f9c | 877 | break; |
fe675038 JK |
878 | /* else fallthrough */ |
879 | ||
880 | case BPSTAT_WHAT_SINGLE: | |
881 | if (breakpoints_inserted) | |
882 | remove_breakpoints (); | |
883 | breakpoints_inserted = 0; | |
884 | another_trap = 1; | |
885 | /* Still need to check other stuff, at least the case | |
886 | where we are stepping and step out of the right range. */ | |
887 | break; | |
888 | ||
889 | case BPSTAT_WHAT_STOP_NOISY: | |
890 | stop_print_frame = 1; | |
bcc37718 JK |
891 | |
892 | /* We are about to nuke the step_resume_breakpoint and | |
893 | through_sigtramp_breakpoint via the cleanup chain, so | |
894 | no need to worry about it here. */ | |
895 | ||
fe675038 | 896 | goto stop_stepping; |
101b7f9c | 897 | |
fe675038 JK |
898 | case BPSTAT_WHAT_STOP_SILENT: |
899 | stop_print_frame = 0; | |
fe675038 | 900 | |
bcc37718 JK |
901 | /* We are about to nuke the step_resume_breakpoint and |
902 | through_sigtramp_breakpoint via the cleanup chain, so | |
903 | no need to worry about it here. */ | |
100f92e2 | 904 | |
bcc37718 | 905 | goto stop_stepping; |
fe675038 | 906 | |
bcc37718 | 907 | case BPSTAT_WHAT_STEP_RESUME: |
fe675038 JK |
908 | delete_breakpoint (step_resume_breakpoint); |
909 | step_resume_breakpoint = NULL; | |
bcc37718 JK |
910 | break; |
911 | ||
912 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
913 | delete_breakpoint (through_sigtramp_breakpoint); | |
914 | through_sigtramp_breakpoint = NULL; | |
30875e1c | 915 | |
fe675038 JK |
916 | /* If were waiting for a trap, hitting the step_resume_break |
917 | doesn't count as getting it. */ | |
918 | if (trap_expected) | |
919 | another_trap = 1; | |
bcc37718 JK |
920 | break; |
921 | ||
922 | case BPSTAT_WHAT_LAST: | |
923 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
924 | ||
925 | case BPSTAT_WHAT_KEEP_CHECKING: | |
926 | break; | |
30875e1c | 927 | } |
fe675038 | 928 | } |
30875e1c SG |
929 | |
930 | /* We come here if we hit a breakpoint but should not | |
931 | stop for it. Possibly we also were stepping | |
932 | and should stop for that. So fall through and | |
933 | test for stepping. But, if not stepping, | |
934 | do not stop. */ | |
935 | ||
84d59861 JK |
936 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
937 | /* This is the old way of detecting the end of the stack dummy. | |
938 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
939 | handled above. As soon as we can test it on all of them, all | |
940 | architectures should define it. */ | |
941 | ||
bd5635a1 | 942 | /* If this is the breakpoint at the end of a stack dummy, |
c9de302b SG |
943 | just stop silently, unless the user was doing an si/ni, in which |
944 | case she'd better know what she's doing. */ | |
945 | ||
946 | if (PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) | |
947 | && !step_range_end) | |
948 | { | |
949 | stop_print_frame = 0; | |
950 | stop_stack_dummy = 1; | |
bd5635a1 | 951 | #ifdef HP_OS_BUG |
c9de302b | 952 | trap_expected_after_continue = 1; |
bd5635a1 | 953 | #endif |
c9de302b SG |
954 | break; |
955 | } | |
84d59861 JK |
956 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
957 | ||
fe675038 | 958 | if (step_resume_breakpoint) |
bd5635a1 RP |
959 | /* Having a step-resume breakpoint overrides anything |
960 | else having to do with stepping commands until | |
961 | that breakpoint is reached. */ | |
bcc37718 JK |
962 | /* I'm not sure whether this needs to be check_sigtramp2 or |
963 | whether it could/should be keep_going. */ | |
fe675038 JK |
964 | goto check_sigtramp2; |
965 | ||
966 | if (step_range_end == 0) | |
967 | /* Likewise if we aren't even stepping. */ | |
968 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
969 | whether it could/should be keep_going. */ | |
970 | goto check_sigtramp2; | |
971 | ||
bd5635a1 | 972 | /* If stepping through a line, keep going if still within it. */ |
fe675038 JK |
973 | if (stop_pc >= step_range_start |
974 | && stop_pc < step_range_end | |
975 | /* The step range might include the start of the | |
976 | function, so if we are at the start of the | |
977 | step range and either the stack or frame pointers | |
978 | just changed, we've stepped outside */ | |
979 | && !(stop_pc == step_range_start | |
980 | && stop_frame_address | |
981 | && (stop_sp INNER_THAN prev_sp | |
982 | || stop_frame_address != step_frame_address))) | |
bd5635a1 | 983 | { |
fe675038 JK |
984 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. |
985 | So definately need to check for sigtramp here. */ | |
986 | goto check_sigtramp2; | |
bd5635a1 | 987 | } |
fe675038 | 988 | |
bd5635a1 RP |
989 | /* We stepped out of the stepping range. See if that was due |
990 | to a subroutine call that we should proceed to the end of. */ | |
fe675038 JK |
991 | |
992 | /* Did we just take a signal? */ | |
993 | if (IN_SIGTRAMP (stop_pc, stop_func_name) | |
994 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) | |
bd5635a1 | 995 | { |
bcc37718 JK |
996 | /* We've just taken a signal; go until we are back to |
997 | the point where we took it and one more. */ | |
998 | ||
fe675038 JK |
999 | /* This code is needed at least in the following case: |
1000 | The user types "next" and then a signal arrives (before | |
1001 | the "next" is done). */ | |
bcc37718 JK |
1002 | |
1003 | /* Note that if we are stopped at a breakpoint, then we need | |
1004 | the step_resume breakpoint to override any breakpoints at | |
1005 | the same location, so that we will still step over the | |
1006 | breakpoint even though the signal happened. */ | |
1007 | ||
fe675038 JK |
1008 | { |
1009 | struct symtab_and_line sr_sal; | |
1010 | ||
1011 | sr_sal.pc = prev_pc; | |
1012 | sr_sal.symtab = NULL; | |
1013 | sr_sal.line = 0; | |
d1c0c6cf JK |
1014 | /* We could probably be setting the frame to |
1015 | prev_frame_address; the reason we don't is that it didn't used | |
1016 | to exist. */ | |
fe675038 | 1017 | step_resume_breakpoint = |
bcc37718 | 1018 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); |
fe675038 JK |
1019 | if (breakpoints_inserted) |
1020 | insert_breakpoints (); | |
1021 | } | |
bd5635a1 | 1022 | |
fe675038 JK |
1023 | /* If this is stepi or nexti, make sure that the stepping range |
1024 | gets us past that instruction. */ | |
1025 | if (step_range_end == 1) | |
1026 | /* FIXME: Does this run afoul of the code below which, if | |
1027 | we step into the middle of a line, resets the stepping | |
1028 | range? */ | |
1029 | step_range_end = (step_range_start = prev_pc) + 1; | |
101b7f9c | 1030 | |
fe675038 JK |
1031 | remove_breakpoints_on_following_step = 1; |
1032 | goto keep_going; | |
1033 | } | |
30875e1c | 1034 | |
fe675038 JK |
1035 | if (stop_func_start) |
1036 | { | |
1037 | /* Do this after the IN_SIGTRAMP check; it might give | |
1038 | an error. */ | |
1039 | prologue_pc = stop_func_start; | |
1040 | SKIP_PROLOGUE (prologue_pc); | |
1041 | } | |
30875e1c | 1042 | |
c0c14c1e JK |
1043 | if ((/* Might be a non-recursive call. If the symbols are missing |
1044 | enough that stop_func_start == prev_func_start even though | |
1045 | they are really two functions, we will treat some calls as | |
1046 | jumps. */ | |
1047 | stop_func_start != prev_func_start | |
1048 | ||
1049 | /* Might be a recursive call if either we have a prologue | |
1050 | or the call instruction itself saves the PC on the stack. */ | |
1051 | || prologue_pc != stop_func_start | |
1052 | || stop_sp != prev_sp) | |
199b2450 TL |
1053 | && (/* PC is completely out of bounds of any known objfiles. Treat |
1054 | like a subroutine call. */ | |
1055 | ! stop_func_start | |
c0c14c1e | 1056 | |
f1619234 | 1057 | /* If we do a call, we will be at the start of a function... */ |
c0c14c1e | 1058 | || stop_pc == stop_func_start |
f1619234 JK |
1059 | |
1060 | /* ...except on the Alpha with -O (and also Irix 5 and | |
1061 | perhaps others), in which we might call the address | |
1062 | after the load of gp. Since prologues don't contain | |
1063 | calls, we can't return to within one, and we don't | |
1064 | jump back into them, so this check is OK. */ | |
c0c14c1e | 1065 | |
c0c14c1e | 1066 | || stop_pc < prologue_pc |
d747e0af | 1067 | |
c0c14c1e JK |
1068 | /* If we end up in certain places, it means we did a subroutine |
1069 | call. I'm not completely sure this is necessary now that we | |
1070 | have the above checks with stop_func_start (and now that | |
100f92e2 | 1071 | find_pc_partial_function is pickier). */ |
c0c14c1e JK |
1072 | || IN_SOLIB_TRAMPOLINE (stop_pc, stop_func_name) |
1073 | ||
1074 | /* If none of the above apply, it is a jump within a function, | |
1075 | or a return from a subroutine. The other case is longjmp, | |
1076 | which can no longer happen here as long as the | |
1077 | handling_longjmp stuff is working. */ | |
1078 | )) | |
fe675038 JK |
1079 | { |
1080 | /* It's a subroutine call. */ | |
fee44494 | 1081 | |
fe675038 JK |
1082 | if (step_over_calls == 0) |
1083 | { | |
1084 | /* I presume that step_over_calls is only 0 when we're | |
1085 | supposed to be stepping at the assembly language level | |
1086 | ("stepi"). Just stop. */ | |
1087 | stop_step = 1; | |
1088 | break; | |
1089 | } | |
fee44494 | 1090 | |
fe675038 JK |
1091 | if (step_over_calls > 0) |
1092 | /* We're doing a "next". */ | |
1093 | goto step_over_function; | |
1094 | ||
1095 | /* If we are in a function call trampoline (a stub between | |
1096 | the calling routine and the real function), locate the real | |
1097 | function. That's what tells us (a) whether we want to step | |
1098 | into it at all, and (b) what prologue we want to run to | |
1099 | the end of, if we do step into it. */ | |
1100 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
1101 | if (tmp != 0) | |
1102 | stop_func_start = tmp; | |
1103 | ||
1104 | /* If we have line number information for the function we | |
1105 | are thinking of stepping into, step into it. | |
1106 | ||
1107 | If there are several symtabs at that PC (e.g. with include | |
1108 | files), just want to know whether *any* of them have line | |
1109 | numbers. find_pc_line handles this. */ | |
1110 | { | |
1111 | struct symtab_and_line tmp_sal; | |
1112 | ||
1113 | tmp_sal = find_pc_line (stop_func_start, 0); | |
1114 | if (tmp_sal.line != 0) | |
1115 | goto step_into_function; | |
1116 | } | |
d747e0af MT |
1117 | |
1118 | step_over_function: | |
fe675038 JK |
1119 | /* A subroutine call has happened. */ |
1120 | { | |
1121 | /* Set a special breakpoint after the return */ | |
1122 | struct symtab_and_line sr_sal; | |
1123 | sr_sal.pc = | |
1124 | ADDR_BITS_REMOVE | |
1125 | (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
1126 | sr_sal.symtab = NULL; | |
1127 | sr_sal.line = 0; | |
1128 | step_resume_breakpoint = | |
1129 | set_momentary_breakpoint (sr_sal, get_current_frame (), | |
1130 | bp_step_resume); | |
bcc37718 | 1131 | step_resume_breakpoint->frame = prev_frame_address; |
fe675038 JK |
1132 | if (breakpoints_inserted) |
1133 | insert_breakpoints (); | |
1134 | } | |
1135 | goto keep_going; | |
d747e0af MT |
1136 | |
1137 | step_into_function: | |
fe675038 JK |
1138 | /* Subroutine call with source code we should not step over. |
1139 | Do step to the first line of code in it. */ | |
1140 | SKIP_PROLOGUE (stop_func_start); | |
1141 | sal = find_pc_line (stop_func_start, 0); | |
1142 | /* Use the step_resume_break to step until | |
1143 | the end of the prologue, even if that involves jumps | |
1144 | (as it seems to on the vax under 4.2). */ | |
1145 | /* If the prologue ends in the middle of a source line, | |
67ac9759 JK |
1146 | continue to the end of that source line (if it is still |
1147 | within the function). Otherwise, just go to end of prologue. */ | |
bd5635a1 | 1148 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP |
fe675038 JK |
1149 | /* no, don't either. It skips any code that's |
1150 | legitimately on the first line. */ | |
bd5635a1 | 1151 | #else |
67ac9759 | 1152 | if (sal.end && sal.pc != stop_func_start && sal.end < stop_func_end) |
fe675038 | 1153 | stop_func_start = sal.end; |
bd5635a1 | 1154 | #endif |
d747e0af | 1155 | |
fe675038 JK |
1156 | if (stop_func_start == stop_pc) |
1157 | { | |
1158 | /* We are already there: stop now. */ | |
1159 | stop_step = 1; | |
1160 | break; | |
1161 | } | |
1162 | else | |
1163 | /* Put the step-breakpoint there and go until there. */ | |
1164 | { | |
1165 | struct symtab_and_line sr_sal; | |
1166 | ||
1167 | sr_sal.pc = stop_func_start; | |
1168 | sr_sal.symtab = NULL; | |
1169 | sr_sal.line = 0; | |
1170 | /* Do not specify what the fp should be when we stop | |
1171 | since on some machines the prologue | |
1172 | is where the new fp value is established. */ | |
1173 | step_resume_breakpoint = | |
84d59861 | 1174 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); |
fe675038 JK |
1175 | if (breakpoints_inserted) |
1176 | insert_breakpoints (); | |
1177 | ||
1178 | /* And make sure stepping stops right away then. */ | |
1179 | step_range_end = step_range_start; | |
bd5635a1 | 1180 | } |
fe675038 JK |
1181 | goto keep_going; |
1182 | } | |
d747e0af | 1183 | |
b2f03c30 | 1184 | /* We've wandered out of the step range. */ |
d747e0af | 1185 | |
fe675038 JK |
1186 | sal = find_pc_line(stop_pc, 0); |
1187 | ||
1188 | if (step_range_end == 1) | |
1189 | { | |
1190 | /* It is stepi or nexti. We always want to stop stepping after | |
1191 | one instruction. */ | |
1192 | stop_step = 1; | |
1193 | break; | |
1194 | } | |
1195 | ||
1196 | if (sal.line == 0) | |
1197 | { | |
1198 | /* We have no line number information. That means to stop | |
1199 | stepping (does this always happen right after one instruction, | |
1200 | when we do "s" in a function with no line numbers, | |
1201 | or can this happen as a result of a return or longjmp?). */ | |
1202 | stop_step = 1; | |
1203 | break; | |
1204 | } | |
1205 | ||
b2f03c30 JK |
1206 | if (stop_pc == sal.pc |
1207 | && (current_line != sal.line || current_symtab != sal.symtab)) | |
fe675038 JK |
1208 | { |
1209 | /* We are at the start of a different line. So stop. Note that | |
1210 | we don't stop if we step into the middle of a different line. | |
1211 | That is said to make things like for (;;) statements work | |
1212 | better. */ | |
1213 | stop_step = 1; | |
1214 | break; | |
bd5635a1 RP |
1215 | } |
1216 | ||
fe675038 JK |
1217 | /* We aren't done stepping. |
1218 | ||
1219 | Optimize by setting the stepping range to the line. | |
1220 | (We might not be in the original line, but if we entered a | |
1221 | new line in mid-statement, we continue stepping. This makes | |
1222 | things like for(;;) statements work better.) */ | |
67ac9759 JK |
1223 | |
1224 | if (stop_func_end && sal.end >= stop_func_end) | |
1225 | { | |
1226 | /* If this is the last line of the function, don't keep stepping | |
1227 | (it would probably step us out of the function). | |
1228 | This is particularly necessary for a one-line function, | |
1229 | in which after skipping the prologue we better stop even though | |
1230 | we will be in mid-line. */ | |
1231 | stop_step = 1; | |
1232 | break; | |
1233 | } | |
fe675038 JK |
1234 | step_range_start = sal.pc; |
1235 | step_range_end = sal.end; | |
1236 | goto keep_going; | |
1237 | ||
1238 | check_sigtramp2: | |
d747e0af MT |
1239 | if (trap_expected |
1240 | && IN_SIGTRAMP (stop_pc, stop_func_name) | |
1241 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) | |
bd5635a1 RP |
1242 | { |
1243 | /* What has happened here is that we have just stepped the inferior | |
1244 | with a signal (because it is a signal which shouldn't make | |
1245 | us stop), thus stepping into sigtramp. | |
1246 | ||
1247 | So we need to set a step_resume_break_address breakpoint | |
fe675038 JK |
1248 | and continue until we hit it, and then step. FIXME: This should |
1249 | be more enduring than a step_resume breakpoint; we should know | |
1250 | that we will later need to keep going rather than re-hitting | |
1251 | the breakpoint here (see testsuite/gdb.t06/signals.exp where | |
1252 | it says "exceedingly difficult"). */ | |
1253 | struct symtab_and_line sr_sal; | |
1254 | ||
1255 | sr_sal.pc = prev_pc; | |
1256 | sr_sal.symtab = NULL; | |
1257 | sr_sal.line = 0; | |
bcc37718 JK |
1258 | /* We perhaps could set the frame if we kept track of what |
1259 | the frame corresponding to prev_pc was. But we don't, | |
1260 | so don't. */ | |
1261 | through_sigtramp_breakpoint = | |
1262 | set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp); | |
bd5635a1 | 1263 | if (breakpoints_inserted) |
fe675038 JK |
1264 | insert_breakpoints (); |
1265 | ||
bd5635a1 RP |
1266 | remove_breakpoints_on_following_step = 1; |
1267 | another_trap = 1; | |
1268 | } | |
1269 | ||
30875e1c | 1270 | keep_going: |
fe675038 JK |
1271 | /* Come to this label when you need to resume the inferior. |
1272 | It's really much cleaner to do a goto than a maze of if-else | |
1273 | conditions. */ | |
30875e1c | 1274 | |
bd5635a1 RP |
1275 | /* Save the pc before execution, to compare with pc after stop. */ |
1276 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
1277 | prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER | |
1278 | BREAK is defined, the | |
1279 | original pc would not have | |
1280 | been at the start of a | |
1281 | function. */ | |
1282 | prev_func_name = stop_func_name; | |
1283 | prev_sp = stop_sp; | |
bcc37718 | 1284 | prev_frame_address = stop_frame_address; |
bd5635a1 RP |
1285 | |
1286 | /* If we did not do break;, it means we should keep | |
1287 | running the inferior and not return to debugger. */ | |
1288 | ||
67ac9759 | 1289 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) |
bd5635a1 RP |
1290 | { |
1291 | /* We took a signal (which we are supposed to pass through to | |
1292 | the inferior, else we'd have done a break above) and we | |
1293 | haven't yet gotten our trap. Simply continue. */ | |
cb6b0202 | 1294 | resume (CURRENTLY_STEPPING (), stop_signal); |
bd5635a1 RP |
1295 | } |
1296 | else | |
1297 | { | |
1298 | /* Either the trap was not expected, but we are continuing | |
1299 | anyway (the user asked that this signal be passed to the | |
1300 | child) | |
1301 | -- or -- | |
1302 | The signal was SIGTRAP, e.g. it was our signal, but we | |
1303 | decided we should resume from it. | |
1304 | ||
1305 | We're going to run this baby now! | |
1306 | ||
1307 | Insert breakpoints now, unless we are trying | |
1308 | to one-proceed past a breakpoint. */ | |
1309 | /* If we've just finished a special step resume and we don't | |
1310 | want to hit a breakpoint, pull em out. */ | |
d1c0c6cf JK |
1311 | if (step_resume_breakpoint == NULL |
1312 | && through_sigtramp_breakpoint == NULL | |
1313 | && remove_breakpoints_on_following_step) | |
bd5635a1 RP |
1314 | { |
1315 | remove_breakpoints_on_following_step = 0; | |
1316 | remove_breakpoints (); | |
1317 | breakpoints_inserted = 0; | |
1318 | } | |
1319 | else if (!breakpoints_inserted && | |
bcc37718 | 1320 | (through_sigtramp_breakpoint != NULL || !another_trap)) |
bd5635a1 | 1321 | { |
bd5635a1 RP |
1322 | breakpoints_failed = insert_breakpoints (); |
1323 | if (breakpoints_failed) | |
1324 | break; | |
1325 | breakpoints_inserted = 1; | |
1326 | } | |
1327 | ||
1328 | trap_expected = another_trap; | |
1329 | ||
67ac9759 JK |
1330 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1331 | stop_signal = TARGET_SIGNAL_0; | |
bd5635a1 RP |
1332 | |
1333 | #ifdef SHIFT_INST_REGS | |
1334 | /* I'm not sure when this following segment applies. I do know, now, | |
1335 | that we shouldn't rewrite the regs when we were stopped by a | |
1336 | random signal from the inferior process. */ | |
cef4c2e7 PS |
1337 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? |
1338 | (this is only used on the 88k). */ | |
bd5635a1 | 1339 | |
d11c44f1 | 1340 | if (!bpstat_explains_signal (stop_bpstat) |
67ac9759 | 1341 | && (stop_signal != TARGET_SIGNAL_CHLD) |
bd5635a1 | 1342 | && !stopped_by_random_signal) |
07a5991a | 1343 | SHIFT_INST_REGS(); |
bd5635a1 RP |
1344 | #endif /* SHIFT_INST_REGS */ |
1345 | ||
cb6b0202 | 1346 | resume (CURRENTLY_STEPPING (), stop_signal); |
bd5635a1 RP |
1347 | } |
1348 | } | |
30875e1c SG |
1349 | |
1350 | stop_stepping: | |
bd5635a1 RP |
1351 | if (target_has_execution) |
1352 | { | |
1353 | /* Assuming the inferior still exists, set these up for next | |
1354 | time, just like we did above if we didn't break out of the | |
1355 | loop. */ | |
1356 | prev_pc = read_pc (); | |
1357 | prev_func_start = stop_func_start; | |
1358 | prev_func_name = stop_func_name; | |
1359 | prev_sp = stop_sp; | |
bcc37718 | 1360 | prev_frame_address = stop_frame_address; |
bd5635a1 | 1361 | } |
fe675038 | 1362 | do_cleanups (old_cleanups); |
bd5635a1 RP |
1363 | } |
1364 | \f | |
1365 | /* Here to return control to GDB when the inferior stops for real. | |
1366 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
1367 | ||
1368 | STOP_PRINT_FRAME nonzero means print the executing frame | |
1369 | (pc, function, args, file, line number and line text). | |
1370 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
1371 | attempting to insert breakpoints. */ | |
1372 | ||
1373 | void | |
1374 | normal_stop () | |
1375 | { | |
1376 | /* Make sure that the current_frame's pc is correct. This | |
1377 | is a correction for setting up the frame info before doing | |
1378 | DECR_PC_AFTER_BREAK */ | |
3f0184ac | 1379 | if (target_has_execution && get_current_frame()) |
bd5635a1 RP |
1380 | (get_current_frame ())->pc = read_pc (); |
1381 | ||
1382 | if (breakpoints_failed) | |
1383 | { | |
1384 | target_terminal_ours_for_output (); | |
1385 | print_sys_errmsg ("ptrace", breakpoints_failed); | |
e37a6e9c | 1386 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
bd5635a1 RP |
1387 | The same program may be running in another process.\n"); |
1388 | } | |
1389 | ||
bd5635a1 RP |
1390 | if (target_has_execution && breakpoints_inserted) |
1391 | if (remove_breakpoints ()) | |
1392 | { | |
1393 | target_terminal_ours_for_output (); | |
e37a6e9c | 1394 | printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\ |
bd5635a1 RP |
1395 | It might be running in another process.\n\ |
1396 | Further execution is probably impossible.\n"); | |
1397 | } | |
1398 | ||
1399 | breakpoints_inserted = 0; | |
1400 | ||
1401 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
1402 | Delete any breakpoint that is to be deleted at the next stop. */ | |
1403 | ||
1404 | breakpoint_auto_delete (stop_bpstat); | |
1405 | ||
1406 | /* If an auto-display called a function and that got a signal, | |
1407 | delete that auto-display to avoid an infinite recursion. */ | |
1408 | ||
1409 | if (stopped_by_random_signal) | |
1410 | disable_current_display (); | |
1411 | ||
1412 | if (step_multi && stop_step) | |
1413 | return; | |
1414 | ||
1415 | target_terminal_ours (); | |
1416 | ||
3950a34e RP |
1417 | /* Look up the hook_stop and run it if it exists. */ |
1418 | ||
1419 | if (stop_command->hook) | |
1420 | { | |
1421 | catch_errors (hook_stop_stub, (char *)stop_command->hook, | |
fee44494 | 1422 | "Error while running hook_stop:\n", RETURN_MASK_ALL); |
3950a34e RP |
1423 | } |
1424 | ||
bd5635a1 RP |
1425 | if (!target_has_stack) |
1426 | return; | |
1427 | ||
1428 | /* Select innermost stack frame except on return from a stack dummy routine, | |
1515ff18 JG |
1429 | or if the program has exited. Print it without a level number if |
1430 | we have changed functions or hit a breakpoint. Print source line | |
1431 | if we have one. */ | |
bd5635a1 RP |
1432 | if (!stop_stack_dummy) |
1433 | { | |
bd5635a1 RP |
1434 | if (stop_print_frame) |
1435 | { | |
1515ff18 JG |
1436 | int source_only; |
1437 | ||
1438 | source_only = bpstat_print (stop_bpstat); | |
1439 | source_only = source_only || | |
1440 | ( stop_step | |
bd5635a1 | 1441 | && step_frame_address == stop_frame_address |
1515ff18 JG |
1442 | && step_start_function == find_pc_function (stop_pc)); |
1443 | ||
1444 | print_stack_frame (selected_frame, -1, source_only? -1: 1); | |
bd5635a1 RP |
1445 | |
1446 | /* Display the auto-display expressions. */ | |
1447 | do_displays (); | |
1448 | } | |
1449 | } | |
1450 | ||
1451 | /* Save the function value return registers, if we care. | |
1452 | We might be about to restore their previous contents. */ | |
1453 | if (proceed_to_finish) | |
1454 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
1455 | ||
1456 | if (stop_stack_dummy) | |
1457 | { | |
1458 | /* Pop the empty frame that contains the stack dummy. | |
1459 | POP_FRAME ends with a setting of the current frame, so we | |
1460 | can use that next. */ | |
1461 | POP_FRAME; | |
f1de67d3 PS |
1462 | /* Set stop_pc to what it was before we called the function. Can't rely |
1463 | on restore_inferior_status because that only gets called if we don't | |
1464 | stop in the called function. */ | |
1465 | stop_pc = read_pc(); | |
bd5635a1 RP |
1466 | select_frame (get_current_frame (), 0); |
1467 | } | |
1468 | } | |
3950a34e RP |
1469 | |
1470 | static int | |
1471 | hook_stop_stub (cmd) | |
1472 | char *cmd; | |
1473 | { | |
1474 | execute_user_command ((struct cmd_list_element *)cmd, 0); | |
a8a69e63 | 1475 | return (0); |
3950a34e | 1476 | } |
bd5635a1 | 1477 | \f |
cc221e76 FF |
1478 | int signal_stop_state (signo) |
1479 | int signo; | |
1480 | { | |
67ac9759 | 1481 | return signal_stop[signo]; |
cc221e76 FF |
1482 | } |
1483 | ||
1484 | int signal_print_state (signo) | |
1485 | int signo; | |
1486 | { | |
67ac9759 | 1487 | return signal_print[signo]; |
cc221e76 FF |
1488 | } |
1489 | ||
1490 | int signal_pass_state (signo) | |
1491 | int signo; | |
1492 | { | |
67ac9759 | 1493 | return signal_program[signo]; |
cc221e76 FF |
1494 | } |
1495 | ||
bd5635a1 RP |
1496 | static void |
1497 | sig_print_header () | |
1498 | { | |
67ac9759 JK |
1499 | printf_filtered ("\ |
1500 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
bd5635a1 RP |
1501 | } |
1502 | ||
1503 | static void | |
67ac9759 JK |
1504 | sig_print_info (oursig) |
1505 | enum target_signal oursig; | |
bd5635a1 | 1506 | { |
67ac9759 JK |
1507 | char *name = target_signal_to_name (oursig); |
1508 | printf_filtered ("%s", name); | |
1509 | printf_filtered ("%*.*s ", 13 - strlen (name), 13 - strlen (name), | |
1510 | " "); | |
1511 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
1512 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
1513 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
1514 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
bd5635a1 RP |
1515 | } |
1516 | ||
1517 | /* Specify how various signals in the inferior should be handled. */ | |
1518 | ||
1519 | static void | |
1520 | handle_command (args, from_tty) | |
1521 | char *args; | |
1522 | int from_tty; | |
1523 | { | |
072b552a JG |
1524 | char **argv; |
1525 | int digits, wordlen; | |
1526 | int sigfirst, signum, siglast; | |
67ac9759 | 1527 | enum target_signal oursig; |
072b552a JG |
1528 | int allsigs; |
1529 | int nsigs; | |
1530 | unsigned char *sigs; | |
1531 | struct cleanup *old_chain; | |
1532 | ||
1533 | if (args == NULL) | |
1534 | { | |
1535 | error_no_arg ("signal to handle"); | |
1536 | } | |
bd5635a1 | 1537 | |
072b552a JG |
1538 | /* Allocate and zero an array of flags for which signals to handle. */ |
1539 | ||
67ac9759 | 1540 | nsigs = (int)TARGET_SIGNAL_LAST; |
072b552a JG |
1541 | sigs = (unsigned char *) alloca (nsigs); |
1542 | memset (sigs, 0, nsigs); | |
bd5635a1 | 1543 | |
072b552a JG |
1544 | /* Break the command line up into args. */ |
1545 | ||
1546 | argv = buildargv (args); | |
1547 | if (argv == NULL) | |
bd5635a1 | 1548 | { |
072b552a JG |
1549 | nomem (0); |
1550 | } | |
1551 | old_chain = make_cleanup (freeargv, (char *) argv); | |
bd5635a1 | 1552 | |
67ac9759 | 1553 | /* Walk through the args, looking for signal oursigs, signal names, and |
072b552a JG |
1554 | actions. Signal numbers and signal names may be interspersed with |
1555 | actions, with the actions being performed for all signals cumulatively | |
1556 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
bd5635a1 | 1557 | |
072b552a JG |
1558 | while (*argv != NULL) |
1559 | { | |
1560 | wordlen = strlen (*argv); | |
1561 | for (digits = 0; isdigit ((*argv)[digits]); digits++) {;} | |
1562 | allsigs = 0; | |
1563 | sigfirst = siglast = -1; | |
1564 | ||
1565 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
1566 | { | |
1567 | /* Apply action to all signals except those used by the | |
1568 | debugger. Silently skip those. */ | |
1569 | allsigs = 1; | |
1570 | sigfirst = 0; | |
1571 | siglast = nsigs - 1; | |
1572 | } | |
1573 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
1574 | { | |
1575 | SET_SIGS (nsigs, sigs, signal_stop); | |
1576 | SET_SIGS (nsigs, sigs, signal_print); | |
1577 | } | |
1578 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
1579 | { | |
1580 | UNSET_SIGS (nsigs, sigs, signal_program); | |
1581 | } | |
1582 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
1583 | { | |
1584 | SET_SIGS (nsigs, sigs, signal_print); | |
1585 | } | |
1586 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
1587 | { | |
1588 | SET_SIGS (nsigs, sigs, signal_program); | |
1589 | } | |
1590 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
1591 | { | |
1592 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
1593 | } | |
1594 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
1595 | { | |
1596 | SET_SIGS (nsigs, sigs, signal_program); | |
1597 | } | |
1598 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
1599 | { | |
1600 | UNSET_SIGS (nsigs, sigs, signal_print); | |
1601 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
1602 | } | |
1603 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
1604 | { | |
1605 | UNSET_SIGS (nsigs, sigs, signal_program); | |
1606 | } | |
1607 | else if (digits > 0) | |
bd5635a1 | 1608 | { |
67ac9759 JK |
1609 | /* It is numeric. The numeric signal refers to our own internal |
1610 | signal numbering from target.h, not to host/target signal number. | |
1611 | This is a feature; users really should be using symbolic names | |
1612 | anyway, and the common ones like SIGHUP, SIGINT, SIGALRM, etc. | |
1613 | will work right anyway. */ | |
1614 | ||
072b552a JG |
1615 | sigfirst = siglast = atoi (*argv); |
1616 | if ((*argv)[digits] == '-') | |
bd5635a1 | 1617 | { |
072b552a | 1618 | siglast = atoi ((*argv) + digits + 1); |
bd5635a1 | 1619 | } |
072b552a | 1620 | if (sigfirst > siglast) |
bd5635a1 | 1621 | { |
072b552a JG |
1622 | /* Bet he didn't figure we'd think of this case... */ |
1623 | signum = sigfirst; | |
1624 | sigfirst = siglast; | |
1625 | siglast = signum; | |
bd5635a1 | 1626 | } |
072b552a JG |
1627 | if (sigfirst < 0 || sigfirst >= nsigs) |
1628 | { | |
1629 | error ("Signal %d not in range 0-%d", sigfirst, nsigs - 1); | |
1630 | } | |
1631 | if (siglast < 0 || siglast >= nsigs) | |
bd5635a1 | 1632 | { |
072b552a | 1633 | error ("Signal %d not in range 0-%d", siglast, nsigs - 1); |
bd5635a1 RP |
1634 | } |
1635 | } | |
072b552a | 1636 | else |
bd5635a1 | 1637 | { |
fcbc95a7 JK |
1638 | oursig = target_signal_from_name (*argv); |
1639 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
1640 | { | |
1641 | sigfirst = siglast = (int)oursig; | |
1642 | } | |
1643 | else | |
1644 | { | |
1645 | /* Not a number and not a recognized flag word => complain. */ | |
1646 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
1647 | } | |
bd5635a1 | 1648 | } |
072b552a JG |
1649 | |
1650 | /* If any signal numbers or symbol names were found, set flags for | |
1651 | which signals to apply actions to. */ | |
1652 | ||
1653 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
bd5635a1 | 1654 | { |
67ac9759 | 1655 | switch ((enum target_signal)signum) |
072b552a | 1656 | { |
67ac9759 JK |
1657 | case TARGET_SIGNAL_TRAP: |
1658 | case TARGET_SIGNAL_INT: | |
072b552a JG |
1659 | if (!allsigs && !sigs[signum]) |
1660 | { | |
67ac9759 JK |
1661 | if (query ("%s is used by the debugger.\n\ |
1662 | Are you sure you want to change it? ", | |
1663 | target_signal_to_name | |
1664 | ((enum target_signal)signum))) | |
072b552a JG |
1665 | { |
1666 | sigs[signum] = 1; | |
1667 | } | |
1668 | else | |
1669 | { | |
199b2450 TL |
1670 | printf_unfiltered ("Not confirmed, unchanged.\n"); |
1671 | gdb_flush (gdb_stdout); | |
072b552a JG |
1672 | } |
1673 | } | |
1674 | break; | |
1675 | default: | |
1676 | sigs[signum] = 1; | |
1677 | break; | |
1678 | } | |
bd5635a1 RP |
1679 | } |
1680 | ||
072b552a | 1681 | argv++; |
bd5635a1 RP |
1682 | } |
1683 | ||
de43d7d0 | 1684 | target_notice_signals(inferior_pid); |
cc221e76 | 1685 | |
bd5635a1 RP |
1686 | if (from_tty) |
1687 | { | |
1688 | /* Show the results. */ | |
1689 | sig_print_header (); | |
072b552a JG |
1690 | for (signum = 0; signum < nsigs; signum++) |
1691 | { | |
1692 | if (sigs[signum]) | |
1693 | { | |
1694 | sig_print_info (signum); | |
1695 | } | |
1696 | } | |
bd5635a1 | 1697 | } |
072b552a JG |
1698 | |
1699 | do_cleanups (old_chain); | |
bd5635a1 RP |
1700 | } |
1701 | ||
67ac9759 JK |
1702 | /* Print current contents of the tables set by the handle command. |
1703 | It is possible we should just be printing signals actually used | |
1704 | by the current target (but for things to work right when switching | |
1705 | targets, all signals should be in the signal tables). */ | |
bd5635a1 RP |
1706 | |
1707 | static void | |
e37a6e9c | 1708 | signals_info (signum_exp, from_tty) |
bd5635a1 | 1709 | char *signum_exp; |
e37a6e9c | 1710 | int from_tty; |
bd5635a1 | 1711 | { |
67ac9759 | 1712 | enum target_signal oursig; |
bd5635a1 RP |
1713 | sig_print_header (); |
1714 | ||
1715 | if (signum_exp) | |
1716 | { | |
1717 | /* First see if this is a symbol name. */ | |
67ac9759 JK |
1718 | oursig = target_signal_from_name (signum_exp); |
1719 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
bd5635a1 RP |
1720 | { |
1721 | /* Nope, maybe it's an address which evaluates to a signal | |
1722 | number. */ | |
67ac9759 JK |
1723 | /* The numeric signal refers to our own internal |
1724 | signal numbering from target.h, not to host/target signal number. | |
1725 | This is a feature; users really should be using symbolic names | |
1726 | anyway, and the common ones like SIGHUP, SIGINT, SIGALRM, etc. | |
1727 | will work right anyway. */ | |
1728 | int i = parse_and_eval_address (signum_exp); | |
1729 | if (i >= (int)TARGET_SIGNAL_LAST | |
1730 | || i < 0 | |
fcbc95a7 JK |
1731 | || i == (int)TARGET_SIGNAL_UNKNOWN |
1732 | || i == (int)TARGET_SIGNAL_DEFAULT) | |
bd5635a1 | 1733 | error ("Signal number out of bounds."); |
67ac9759 | 1734 | oursig = (enum target_signal)i; |
bd5635a1 | 1735 | } |
67ac9759 | 1736 | sig_print_info (oursig); |
bd5635a1 RP |
1737 | return; |
1738 | } | |
1739 | ||
1740 | printf_filtered ("\n"); | |
db4340a6 | 1741 | /* These ugly casts brought to you by the native VAX compiler. */ |
2fe3b329 | 1742 | for (oursig = TARGET_SIGNAL_FIRST; |
db4340a6 JK |
1743 | (int)oursig < (int)TARGET_SIGNAL_LAST; |
1744 | oursig = (enum target_signal)((int)oursig + 1)) | |
bd5635a1 RP |
1745 | { |
1746 | QUIT; | |
1747 | ||
fcbc95a7 JK |
1748 | if (oursig != TARGET_SIGNAL_UNKNOWN |
1749 | && oursig != TARGET_SIGNAL_DEFAULT | |
1750 | && oursig != TARGET_SIGNAL_0) | |
67ac9759 | 1751 | sig_print_info (oursig); |
bd5635a1 RP |
1752 | } |
1753 | ||
1754 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
1755 | } | |
1756 | \f | |
1757 | /* Save all of the information associated with the inferior<==>gdb | |
1758 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
1759 | (defined in inferior.h). */ | |
1760 | ||
1761 | void | |
1762 | save_inferior_status (inf_status, restore_stack_info) | |
1763 | struct inferior_status *inf_status; | |
1764 | int restore_stack_info; | |
1765 | { | |
bd5635a1 RP |
1766 | inf_status->stop_signal = stop_signal; |
1767 | inf_status->stop_pc = stop_pc; | |
1768 | inf_status->stop_frame_address = stop_frame_address; | |
1769 | inf_status->stop_step = stop_step; | |
1770 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
1771 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
1772 | inf_status->trap_expected = trap_expected; | |
1773 | inf_status->step_range_start = step_range_start; | |
1774 | inf_status->step_range_end = step_range_end; | |
1775 | inf_status->step_frame_address = step_frame_address; | |
1776 | inf_status->step_over_calls = step_over_calls; | |
bd5635a1 RP |
1777 | inf_status->stop_after_trap = stop_after_trap; |
1778 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
1779 | /* Save original bpstat chain here; replace it with copy of chain. | |
1780 | If caller's caller is walking the chain, they'll be happier if we | |
1781 | hand them back the original chain when restore_i_s is called. */ | |
1782 | inf_status->stop_bpstat = stop_bpstat; | |
1783 | stop_bpstat = bpstat_copy (stop_bpstat); | |
1784 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
1785 | inf_status->restore_stack_info = restore_stack_info; | |
1786 | inf_status->proceed_to_finish = proceed_to_finish; | |
1787 | ||
072b552a | 1788 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
37c99ddb JK |
1789 | |
1790 | read_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
1791 | ||
bd5635a1 RP |
1792 | record_selected_frame (&(inf_status->selected_frame_address), |
1793 | &(inf_status->selected_level)); | |
1794 | return; | |
1795 | } | |
1796 | ||
37c99ddb JK |
1797 | struct restore_selected_frame_args { |
1798 | FRAME_ADDR frame_address; | |
1799 | int level; | |
1800 | }; | |
1801 | ||
1802 | static int restore_selected_frame PARAMS ((char *)); | |
1803 | ||
1804 | /* Restore the selected frame. args is really a struct | |
1805 | restore_selected_frame_args * (declared as char * for catch_errors) | |
1806 | telling us what frame to restore. Returns 1 for success, or 0 for | |
1807 | failure. An error message will have been printed on error. */ | |
1808 | static int | |
1809 | restore_selected_frame (args) | |
1810 | char *args; | |
1811 | { | |
1812 | struct restore_selected_frame_args *fr = | |
1813 | (struct restore_selected_frame_args *) args; | |
1814 | FRAME fid; | |
1815 | int level = fr->level; | |
1816 | ||
1817 | fid = find_relative_frame (get_current_frame (), &level); | |
1818 | ||
1819 | /* If inf_status->selected_frame_address is NULL, there was no | |
1820 | previously selected frame. */ | |
1821 | if (fid == 0 || | |
1822 | FRAME_FP (fid) != fr->frame_address || | |
1823 | level != 0) | |
1824 | { | |
1825 | warning ("Unable to restore previously selected frame.\n"); | |
1826 | return 0; | |
1827 | } | |
1828 | select_frame (fid, fr->level); | |
1829 | return(1); | |
1830 | } | |
1831 | ||
bd5635a1 RP |
1832 | void |
1833 | restore_inferior_status (inf_status) | |
1834 | struct inferior_status *inf_status; | |
1835 | { | |
bd5635a1 RP |
1836 | stop_signal = inf_status->stop_signal; |
1837 | stop_pc = inf_status->stop_pc; | |
1838 | stop_frame_address = inf_status->stop_frame_address; | |
1839 | stop_step = inf_status->stop_step; | |
1840 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
1841 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
1842 | trap_expected = inf_status->trap_expected; | |
1843 | step_range_start = inf_status->step_range_start; | |
1844 | step_range_end = inf_status->step_range_end; | |
1845 | step_frame_address = inf_status->step_frame_address; | |
1846 | step_over_calls = inf_status->step_over_calls; | |
bd5635a1 RP |
1847 | stop_after_trap = inf_status->stop_after_trap; |
1848 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
1849 | bpstat_clear (&stop_bpstat); | |
1850 | stop_bpstat = inf_status->stop_bpstat; | |
1851 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
1852 | proceed_to_finish = inf_status->proceed_to_finish; | |
1853 | ||
072b552a | 1854 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
bd5635a1 RP |
1855 | |
1856 | /* The inferior can be gone if the user types "print exit(0)" | |
1857 | (and perhaps other times). */ | |
37c99ddb JK |
1858 | if (target_has_execution) |
1859 | write_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
1860 | ||
1861 | /* The inferior can be gone if the user types "print exit(0)" | |
1862 | (and perhaps other times). */ | |
1863 | ||
1864 | /* FIXME: If we are being called after stopping in a function which | |
1865 | is called from gdb, we should not be trying to restore the | |
1866 | selected frame; it just prints a spurious error message (The | |
1867 | message is useful, however, in detecting bugs in gdb (like if gdb | |
1868 | clobbers the stack)). In fact, should we be restoring the | |
1869 | inferior status at all in that case? . */ | |
1870 | ||
bd5635a1 RP |
1871 | if (target_has_stack && inf_status->restore_stack_info) |
1872 | { | |
37c99ddb JK |
1873 | struct restore_selected_frame_args fr; |
1874 | fr.level = inf_status->selected_level; | |
1875 | fr.frame_address = inf_status->selected_frame_address; | |
1876 | /* The point of catch_errors is that if the stack is clobbered, | |
1877 | walking the stack might encounter a garbage pointer and error() | |
1878 | trying to dereference it. */ | |
1879 | if (catch_errors (restore_selected_frame, &fr, | |
1880 | "Unable to restore previously selected frame:\n", | |
1881 | RETURN_MASK_ERROR) == 0) | |
1882 | /* Error in restoring the selected frame. Select the innermost | |
1883 | frame. */ | |
1884 | select_frame (get_current_frame (), 0); | |
bd5635a1 RP |
1885 | } |
1886 | } | |
1887 | ||
1888 | \f | |
1889 | void | |
1890 | _initialize_infrun () | |
1891 | { | |
1892 | register int i; | |
e37a6e9c | 1893 | register int numsigs; |
bd5635a1 RP |
1894 | |
1895 | add_info ("signals", signals_info, | |
1896 | "What debugger does when program gets various signals.\n\ | |
1897 | Specify a signal number as argument to print info on that signal only."); | |
6b50c5c2 | 1898 | add_info_alias ("handle", "signals", 0); |
bd5635a1 RP |
1899 | |
1900 | add_com ("handle", class_run, handle_command, | |
1901 | "Specify how to handle a signal.\n\ | |
072b552a JG |
1902 | Args are signal numbers and actions to apply to those signals.\n\ |
1903 | Signal numbers may be numeric (ex. 11) or symbolic (ex. SIGSEGV).\n\ | |
1904 | Numeric ranges may be specified with the form LOW-HIGH (ex. 14-21).\n\ | |
1905 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1906 | used by the debugger, typically SIGTRAP and SIGINT.\n\ | |
1907 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
1908 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ | |
bd5635a1 | 1909 | Stop means reenter debugger if this signal happens (implies print).\n\ |
072b552a | 1910 | Print means print a message if this signal happens.\n\ |
bd5635a1 | 1911 | Pass means let program see this signal; otherwise program doesn't know.\n\ |
072b552a | 1912 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
bd5635a1 RP |
1913 | Pass and Stop may be combined."); |
1914 | ||
a8a69e63 | 1915 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, |
3950a34e RP |
1916 | "There is no `stop' command, but you can set a hook on `stop'.\n\ |
1917 | This allows you to set a list of commands to be run each time execution\n\ | |
fee44494 | 1918 | of the program stops.", &cmdlist); |
3950a34e | 1919 | |
67ac9759 JK |
1920 | numsigs = (int)TARGET_SIGNAL_LAST; |
1921 | signal_stop = (unsigned char *) | |
1922 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
1923 | signal_print = (unsigned char *) | |
1924 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
072b552a | 1925 | signal_program = (unsigned char *) |
67ac9759 | 1926 | xmalloc (sizeof (signal_program[0]) * numsigs); |
e37a6e9c | 1927 | for (i = 0; i < numsigs; i++) |
bd5635a1 RP |
1928 | { |
1929 | signal_stop[i] = 1; | |
1930 | signal_print[i] = 1; | |
1931 | signal_program[i] = 1; | |
1932 | } | |
1933 | ||
1934 | /* Signals caused by debugger's own actions | |
1935 | should not be given to the program afterwards. */ | |
67ac9759 JK |
1936 | signal_program[TARGET_SIGNAL_TRAP] = 0; |
1937 | signal_program[TARGET_SIGNAL_INT] = 0; | |
bd5635a1 RP |
1938 | |
1939 | /* Signals that are not errors should not normally enter the debugger. */ | |
67ac9759 JK |
1940 | signal_stop[TARGET_SIGNAL_ALRM] = 0; |
1941 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
1942 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
1943 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
1944 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
1945 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
1946 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
1947 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
1948 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
1949 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4d4f2d50 JK |
1950 | signal_stop[TARGET_SIGNAL_POLL] = 0; |
1951 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
67ac9759 JK |
1952 | signal_stop[TARGET_SIGNAL_URG] = 0; |
1953 | signal_print[TARGET_SIGNAL_URG] = 0; | |
bd5635a1 | 1954 | } |