Commit | Line | Data |
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bd5635a1 | 1 | /* Start (run) and stop the inferior process, for GDB. |
30875e1c | 2 | Copyright 1986, 1987, 1988, 1989, 1991, 1992 Free Software Foundation, Inc. |
bd5635a1 RP |
3 | |
4 | This file is part of GDB. | |
5 | ||
3b271cf4 | 6 | This program is free software; you can redistribute it and/or modify |
bd5635a1 | 7 | it under the terms of the GNU General Public License as published by |
3b271cf4 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
bd5635a1 | 10 | |
3b271cf4 | 11 | This program is distributed in the hope that it will be useful, |
bd5635a1 RP |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
3b271cf4 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
bd5635a1 RP |
19 | |
20 | /* Notes on the algorithm used in wait_for_inferior to determine if we | |
21 | just did a subroutine call when stepping. We have the following | |
22 | information at that point: | |
23 | ||
24 | Current and previous (just before this step) pc. | |
25 | Current and previous sp. | |
26 | Current and previous start of current function. | |
27 | ||
e140f1da | 28 | If the starts of the functions don't match, then |
bd5635a1 RP |
29 | |
30 | a) We did a subroutine call. | |
31 | ||
32 | In this case, the pc will be at the beginning of a function. | |
33 | ||
34 | b) We did a subroutine return. | |
35 | ||
36 | Otherwise. | |
37 | ||
38 | c) We did a longjmp. | |
39 | ||
40 | If we did a longjump, we were doing "nexti", since a next would | |
41 | have attempted to skip over the assembly language routine in which | |
42 | the longjmp is coded and would have simply been the equivalent of a | |
43 | continue. I consider this ok behaivior. We'd like one of two | |
44 | things to happen if we are doing a nexti through the longjmp() | |
45 | routine: 1) It behaves as a stepi, or 2) It acts like a continue as | |
46 | above. Given that this is a special case, and that anybody who | |
47 | thinks that the concept of sub calls is meaningful in the context | |
48 | of a longjmp, I'll take either one. Let's see what happens. | |
49 | ||
50 | Acts like a subroutine return. I can handle that with no problem | |
51 | at all. | |
52 | ||
53 | -->So: If the current and previous beginnings of the current | |
54 | function don't match, *and* the pc is at the start of a function, | |
55 | we've done a subroutine call. If the pc is not at the start of a | |
56 | function, we *didn't* do a subroutine call. | |
57 | ||
58 | -->If the beginnings of the current and previous function do match, | |
59 | either: | |
60 | ||
61 | a) We just did a recursive call. | |
62 | ||
63 | In this case, we would be at the very beginning of a | |
64 | function and 1) it will have a prologue (don't jump to | |
65 | before prologue, or 2) (we assume here that it doesn't have | |
66 | a prologue) there will have been a change in the stack | |
67 | pointer over the last instruction. (Ie. it's got to put | |
68 | the saved pc somewhere. The stack is the usual place. In | |
69 | a recursive call a register is only an option if there's a | |
70 | prologue to do something with it. This is even true on | |
71 | register window machines; the prologue sets up the new | |
72 | window. It might not be true on a register window machine | |
73 | where the call instruction moved the register window | |
74 | itself. Hmmm. One would hope that the stack pointer would | |
75 | also change. If it doesn't, somebody send me a note, and | |
76 | I'll work out a more general theory. | |
77 | bug-gdb@prep.ai.mit.edu). This is true (albeit slipperly | |
78 | so) on all machines I'm aware of: | |
79 | ||
80 | m68k: Call changes stack pointer. Regular jumps don't. | |
81 | ||
82 | sparc: Recursive calls must have frames and therefor, | |
83 | prologues. | |
84 | ||
85 | vax: All calls have frames and hence change the | |
86 | stack pointer. | |
87 | ||
88 | b) We did a return from a recursive call. I don't see that we | |
89 | have either the ability or the need to distinguish this | |
90 | from an ordinary jump. The stack frame will be printed | |
91 | when and if the frame pointer changes; if we are in a | |
92 | function without a frame pointer, it's the users own | |
93 | lookout. | |
94 | ||
95 | c) We did a jump within a function. We assume that this is | |
96 | true if we didn't do a recursive call. | |
97 | ||
98 | d) We are in no-man's land ("I see no symbols here"). We | |
99 | don't worry about this; it will make calls look like simple | |
100 | jumps (and the stack frames will be printed when the frame | |
101 | pointer moves), which is a reasonably non-violent response. | |
bd5635a1 | 102 | */ |
bd5635a1 | 103 | |
bd5635a1 | 104 | #include "defs.h" |
d747e0af | 105 | #include <string.h> |
bd5635a1 RP |
106 | #include "symtab.h" |
107 | #include "frame.h" | |
108 | #include "inferior.h" | |
109 | #include "breakpoint.h" | |
110 | #include "wait.h" | |
111 | #include "gdbcore.h" | |
bd5635a1 RP |
112 | #include "command.h" |
113 | #include "terminal.h" /* For #ifdef TIOCGPGRP and new_tty */ | |
114 | #include "target.h" | |
115 | ||
116 | #include <signal.h> | |
117 | ||
118 | /* unistd.h is needed to #define X_OK */ | |
119 | #ifdef USG | |
120 | #include <unistd.h> | |
121 | #else | |
122 | #include <sys/file.h> | |
123 | #endif | |
124 | ||
125 | #ifdef SET_STACK_LIMIT_HUGE | |
79043f9e JK |
126 | #include <sys/time.h> |
127 | #include <sys/resource.h> | |
128 | ||
bd5635a1 RP |
129 | extern int original_stack_limit; |
130 | #endif /* SET_STACK_LIMIT_HUGE */ | |
131 | ||
30875e1c | 132 | /* Prototypes for local functions */ |
bd5635a1 | 133 | |
30875e1c | 134 | static void |
e37a6e9c | 135 | signals_info PARAMS ((char *, int)); |
619fd145 | 136 | |
30875e1c SG |
137 | static void |
138 | handle_command PARAMS ((char *, int)); | |
139 | ||
140 | static void | |
141 | sig_print_info PARAMS ((int)); | |
142 | ||
143 | static void | |
144 | sig_print_header PARAMS ((void)); | |
145 | ||
146 | static void | |
147 | remove_step_breakpoint PARAMS ((void)); | |
bd5635a1 | 148 | |
30875e1c SG |
149 | static void |
150 | insert_step_breakpoint PARAMS ((void)); | |
151 | ||
152 | static void | |
153 | resume PARAMS ((int, int)); | |
154 | ||
155 | static void | |
156 | resume_cleanups PARAMS ((int)); | |
157 | ||
158 | extern char **environ; | |
159 | ||
160 | extern struct target_ops child_ops; /* In inftarg.c */ | |
bd5635a1 RP |
161 | |
162 | /* Sigtramp is a routine that the kernel calls (which then calls the | |
163 | signal handler). On most machines it is a library routine that | |
164 | is linked into the executable. | |
165 | ||
166 | This macro, given a program counter value and the name of the | |
167 | function in which that PC resides (which can be null if the | |
168 | name is not known), returns nonzero if the PC and name show | |
169 | that we are in sigtramp. | |
170 | ||
171 | On most machines just see if the name is sigtramp (and if we have | |
172 | no name, assume we are not in sigtramp). */ | |
173 | #if !defined (IN_SIGTRAMP) | |
174 | #define IN_SIGTRAMP(pc, name) \ | |
680c9dfa | 175 | (name && !strcmp ("_sigtramp", name)) |
bd5635a1 RP |
176 | #endif |
177 | ||
30875e1c SG |
178 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
179 | program. It needs to examine the jmp_buf argument and extract the PC | |
180 | from it. The return value is non-zero on success, zero otherwise. */ | |
181 | #ifndef GET_LONGJMP_TARGET | |
182 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 | |
183 | #endif | |
184 | ||
d747e0af MT |
185 | |
186 | /* Some machines have trampoline code that sits between function callers | |
187 | and the actual functions themselves. If this machine doesn't have | |
188 | such things, disable their processing. */ | |
189 | #ifndef SKIP_TRAMPOLINE_CODE | |
190 | #define SKIP_TRAMPOLINE_CODE(pc) 0 | |
191 | #endif | |
192 | ||
1eeba686 PB |
193 | /* For SVR4 shared libraries, each call goes through a small piece of |
194 | trampoline code in the ".init" section. IN_SOLIB_TRAMPOLINE evaluates | |
195 | to nonzero if we are current stopped in one of these. */ | |
196 | #ifndef IN_SOLIB_TRAMPOLINE | |
197 | #define IN_SOLIB_TRAMPOLINE(pc,name) 0 | |
198 | #endif | |
d747e0af | 199 | |
cc221e76 FF |
200 | /* Notify other parts of gdb that might care that signal handling may |
201 | have changed for one or more signals. */ | |
202 | #ifndef NOTICE_SIGNAL_HANDLING_CHANGE | |
203 | #define NOTICE_SIGNAL_HANDLING_CHANGE /* No actions */ | |
204 | #endif | |
205 | ||
d747e0af MT |
206 | #ifdef TDESC |
207 | #include "tdesc.h" | |
208 | int safe_to_init_tdesc_context = 0; | |
209 | extern dc_dcontext_t current_context; | |
210 | #endif | |
211 | ||
bd5635a1 RP |
212 | /* Tables of how to react to signals; the user sets them. */ |
213 | ||
072b552a JG |
214 | static unsigned char *signal_stop; |
215 | static unsigned char *signal_print; | |
216 | static unsigned char *signal_program; | |
217 | ||
218 | #define SET_SIGS(nsigs,sigs,flags) \ | |
219 | do { \ | |
220 | int signum = (nsigs); \ | |
221 | while (signum-- > 0) \ | |
222 | if ((sigs)[signum]) \ | |
223 | (flags)[signum] = 1; \ | |
224 | } while (0) | |
225 | ||
226 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
227 | do { \ | |
228 | int signum = (nsigs); \ | |
229 | while (signum-- > 0) \ | |
230 | if ((sigs)[signum]) \ | |
231 | (flags)[signum] = 0; \ | |
232 | } while (0) | |
bd5635a1 RP |
233 | |
234 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
235 | /* Nonstatic for initialization during xxx_create_inferior. FIXME. */ | |
236 | ||
237 | /*static*/ int breakpoints_inserted; | |
238 | ||
239 | /* Function inferior was in as of last step command. */ | |
240 | ||
241 | static struct symbol *step_start_function; | |
242 | ||
243 | /* Nonzero => address for special breakpoint for resuming stepping. */ | |
244 | ||
245 | static CORE_ADDR step_resume_break_address; | |
246 | ||
247 | /* Pointer to orig contents of the byte where the special breakpoint is. */ | |
248 | ||
249 | static char step_resume_break_shadow[BREAKPOINT_MAX]; | |
250 | ||
251 | /* Nonzero means the special breakpoint is a duplicate | |
252 | so it has not itself been inserted. */ | |
253 | ||
254 | static int step_resume_break_duplicate; | |
255 | ||
256 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
257 | ||
258 | static int trap_expected; | |
259 | ||
260 | /* Nonzero if the next time we try to continue the inferior, it will | |
261 | step one instruction and generate a spurious trace trap. | |
262 | This is used to compensate for a bug in HP-UX. */ | |
263 | ||
264 | static int trap_expected_after_continue; | |
265 | ||
266 | /* Nonzero means expecting a trace trap | |
267 | and should stop the inferior and return silently when it happens. */ | |
268 | ||
269 | int stop_after_trap; | |
270 | ||
271 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
272 | It is used after attach, due to attaching to a process; | |
273 | when running in the shell before the child program has been exec'd; | |
274 | and when running some kinds of remote stuff (FIXME?). */ | |
275 | ||
276 | int stop_soon_quietly; | |
277 | ||
278 | /* Nonzero if pc has been changed by the debugger | |
279 | since the inferior stopped. */ | |
280 | ||
281 | int pc_changed; | |
282 | ||
283 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
284 | situation when stop_registers should be saved. */ | |
285 | ||
286 | int proceed_to_finish; | |
287 | ||
288 | /* Save register contents here when about to pop a stack dummy frame, | |
289 | if-and-only-if proceed_to_finish is set. | |
290 | Thus this contains the return value from the called function (assuming | |
291 | values are returned in a register). */ | |
292 | ||
293 | char stop_registers[REGISTER_BYTES]; | |
294 | ||
295 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
296 | ||
297 | static int breakpoints_failed; | |
298 | ||
299 | /* Nonzero after stop if current stack frame should be printed. */ | |
300 | ||
301 | static int stop_print_frame; | |
302 | ||
303 | #ifdef NO_SINGLE_STEP | |
304 | extern int one_stepped; /* From machine dependent code */ | |
305 | extern void single_step (); /* Same. */ | |
306 | #endif /* NO_SINGLE_STEP */ | |
307 | ||
a71d17b1 JK |
308 | \f |
309 | /* Things to clean up if we QUIT out of resume (). */ | |
e1ce8aa5 | 310 | /* ARGSUSED */ |
a71d17b1 JK |
311 | static void |
312 | resume_cleanups (arg) | |
313 | int arg; | |
314 | { | |
315 | normal_stop (); | |
316 | } | |
317 | ||
318 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
319 | wants to interrupt some lengthy single-stepping operation | |
320 | (for child processes, the SIGINT goes to the inferior, and so | |
321 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
322 | other targets, that's not true). | |
323 | ||
324 | STEP nonzero if we should step (zero to continue instead). | |
325 | SIG is the signal to give the inferior (zero for none). */ | |
326 | static void | |
327 | resume (step, sig) | |
328 | int step; | |
329 | int sig; | |
330 | { | |
331 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
332 | QUIT; | |
d11c44f1 JG |
333 | |
334 | #ifdef NO_SINGLE_STEP | |
335 | if (step) { | |
818de002 | 336 | single_step(sig); /* Do it the hard way, w/temp breakpoints */ |
d11c44f1 JG |
337 | step = 0; /* ...and don't ask hardware to do it. */ |
338 | } | |
339 | #endif | |
340 | ||
bdbd5f50 JG |
341 | /* Handle any optimized stores to the inferior NOW... */ |
342 | #ifdef DO_DEFERRED_STORES | |
343 | DO_DEFERRED_STORES; | |
344 | #endif | |
345 | ||
a71d17b1 JK |
346 | target_resume (step, sig); |
347 | discard_cleanups (old_cleanups); | |
348 | } | |
349 | ||
bd5635a1 RP |
350 | \f |
351 | /* Clear out all variables saying what to do when inferior is continued. | |
352 | First do this, then set the ones you want, then call `proceed'. */ | |
353 | ||
354 | void | |
355 | clear_proceed_status () | |
356 | { | |
357 | trap_expected = 0; | |
358 | step_range_start = 0; | |
359 | step_range_end = 0; | |
360 | step_frame_address = 0; | |
361 | step_over_calls = -1; | |
362 | step_resume_break_address = 0; | |
363 | stop_after_trap = 0; | |
364 | stop_soon_quietly = 0; | |
365 | proceed_to_finish = 0; | |
366 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
367 | ||
368 | /* Discard any remaining commands or status from previous stop. */ | |
369 | bpstat_clear (&stop_bpstat); | |
370 | } | |
371 | ||
372 | /* Basic routine for continuing the program in various fashions. | |
373 | ||
374 | ADDR is the address to resume at, or -1 for resume where stopped. | |
375 | SIGGNAL is the signal to give it, or 0 for none, | |
376 | or -1 for act according to how it stopped. | |
377 | STEP is nonzero if should trap after one instruction. | |
378 | -1 means return after that and print nothing. | |
379 | You should probably set various step_... variables | |
380 | before calling here, if you are stepping. | |
381 | ||
382 | You should call clear_proceed_status before calling proceed. */ | |
383 | ||
384 | void | |
385 | proceed (addr, siggnal, step) | |
386 | CORE_ADDR addr; | |
387 | int siggnal; | |
388 | int step; | |
389 | { | |
390 | int oneproc = 0; | |
391 | ||
392 | if (step > 0) | |
393 | step_start_function = find_pc_function (read_pc ()); | |
394 | if (step < 0) | |
395 | stop_after_trap = 1; | |
396 | ||
bdbd5f50 | 397 | if (addr == (CORE_ADDR)-1) |
bd5635a1 RP |
398 | { |
399 | /* If there is a breakpoint at the address we will resume at, | |
400 | step one instruction before inserting breakpoints | |
401 | so that we do not stop right away. */ | |
402 | ||
403 | if (!pc_changed && breakpoint_here_p (read_pc ())) | |
404 | oneproc = 1; | |
405 | } | |
406 | else | |
407 | { | |
408 | write_register (PC_REGNUM, addr); | |
409 | #ifdef NPC_REGNUM | |
410 | write_register (NPC_REGNUM, addr + 4); | |
411 | #ifdef NNPC_REGNUM | |
412 | write_register (NNPC_REGNUM, addr + 8); | |
413 | #endif | |
414 | #endif | |
415 | } | |
416 | ||
417 | if (trap_expected_after_continue) | |
418 | { | |
419 | /* If (step == 0), a trap will be automatically generated after | |
420 | the first instruction is executed. Force step one | |
421 | instruction to clear this condition. This should not occur | |
422 | if step is nonzero, but it is harmless in that case. */ | |
423 | oneproc = 1; | |
424 | trap_expected_after_continue = 0; | |
425 | } | |
426 | ||
427 | if (oneproc) | |
428 | /* We will get a trace trap after one instruction. | |
429 | Continue it automatically and insert breakpoints then. */ | |
430 | trap_expected = 1; | |
431 | else | |
432 | { | |
433 | int temp = insert_breakpoints (); | |
434 | if (temp) | |
435 | { | |
436 | print_sys_errmsg ("ptrace", temp); | |
437 | error ("Cannot insert breakpoints.\n\ | |
438 | The same program may be running in another process."); | |
439 | } | |
440 | breakpoints_inserted = 1; | |
441 | } | |
442 | ||
443 | /* Install inferior's terminal modes. */ | |
444 | target_terminal_inferior (); | |
445 | ||
446 | if (siggnal >= 0) | |
447 | stop_signal = siggnal; | |
448 | /* If this signal should not be seen by program, | |
449 | give it zero. Used for debugging signals. */ | |
450 | else if (stop_signal < NSIG && !signal_program[stop_signal]) | |
451 | stop_signal= 0; | |
452 | ||
bd5635a1 | 453 | /* Resume inferior. */ |
a71d17b1 | 454 | resume (oneproc || step || bpstat_should_step (), stop_signal); |
bd5635a1 RP |
455 | |
456 | /* Wait for it to stop (if not standalone) | |
457 | and in any case decode why it stopped, and act accordingly. */ | |
458 | ||
459 | wait_for_inferior (); | |
460 | normal_stop (); | |
461 | } | |
462 | ||
bd5635a1 RP |
463 | /* Record the pc and sp of the program the last time it stopped. |
464 | These are just used internally by wait_for_inferior, but need | |
465 | to be preserved over calls to it and cleared when the inferior | |
466 | is started. */ | |
467 | static CORE_ADDR prev_pc; | |
468 | static CORE_ADDR prev_sp; | |
469 | static CORE_ADDR prev_func_start; | |
470 | static char *prev_func_name; | |
471 | ||
a71d17b1 | 472 | \f |
bd5635a1 RP |
473 | /* Start an inferior Unix child process and sets inferior_pid to its pid. |
474 | EXEC_FILE is the file to run. | |
475 | ALLARGS is a string containing the arguments to the program. | |
476 | ENV is the environment vector to pass. Errors reported with error(). */ | |
477 | ||
478 | #ifndef SHELL_FILE | |
479 | #define SHELL_FILE "/bin/sh" | |
480 | #endif | |
481 | ||
482 | void | |
483 | child_create_inferior (exec_file, allargs, env) | |
484 | char *exec_file; | |
485 | char *allargs; | |
486 | char **env; | |
487 | { | |
488 | int pid; | |
489 | char *shell_command; | |
bd5635a1 RP |
490 | char *shell_file; |
491 | static char default_shell_file[] = SHELL_FILE; | |
492 | int len; | |
493 | int pending_execs; | |
494 | /* Set debug_fork then attach to the child while it sleeps, to debug. */ | |
495 | static int debug_fork = 0; | |
496 | /* This is set to the result of setpgrp, which if vforked, will be visible | |
497 | to you in the parent process. It's only used by humans for debugging. */ | |
498 | static int debug_setpgrp = 657473; | |
3b271cf4 | 499 | char **save_our_env; |
bd5635a1 RP |
500 | |
501 | /* The user might want tilde-expansion, and in general probably wants | |
502 | the program to behave the same way as if run from | |
503 | his/her favorite shell. So we let the shell run it for us. | |
504 | FIXME, this should probably search the local environment (as | |
505 | modified by the setenv command), not the env gdb inherited. */ | |
506 | shell_file = getenv ("SHELL"); | |
507 | if (shell_file == NULL) | |
508 | shell_file = default_shell_file; | |
509 | ||
510 | len = 5 + strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop*/ 10; | |
511 | /* If desired, concat something onto the front of ALLARGS. | |
512 | SHELL_COMMAND is the result. */ | |
513 | #ifdef SHELL_COMMAND_CONCAT | |
514 | shell_command = (char *) alloca (strlen (SHELL_COMMAND_CONCAT) + len); | |
515 | strcpy (shell_command, SHELL_COMMAND_CONCAT); | |
516 | #else | |
517 | shell_command = (char *) alloca (len); | |
518 | shell_command[0] = '\0'; | |
519 | #endif | |
520 | strcat (shell_command, "exec "); | |
521 | strcat (shell_command, exec_file); | |
522 | strcat (shell_command, " "); | |
523 | strcat (shell_command, allargs); | |
524 | ||
525 | /* exec is said to fail if the executable is open. */ | |
526 | close_exec_file (); | |
527 | ||
3b271cf4 JG |
528 | /* Retain a copy of our environment variables, since the child will |
529 | replace the value of environ and if we're vforked, we have to | |
530 | restore it. */ | |
531 | save_our_env = environ; | |
532 | ||
bdbd5f50 JG |
533 | /* Tell the terminal handling subsystem what tty we plan to run on; |
534 | it will just record the information for later. */ | |
535 | ||
536 | new_tty_prefork (inferior_io_terminal); | |
537 | ||
b3b39c0c SG |
538 | /* It is generally good practice to flush any possible pending stdio |
539 | output prior to doing a fork, to avoid the possibility of both the | |
540 | parent and child flushing the same data after the fork. */ | |
541 | ||
542 | fflush (stdout); | |
543 | fflush (stderr); | |
544 | ||
bd5635a1 RP |
545 | #if defined(USG) && !defined(HAVE_VFORK) |
546 | pid = fork (); | |
547 | #else | |
548 | if (debug_fork) | |
549 | pid = fork (); | |
550 | else | |
551 | pid = vfork (); | |
552 | #endif | |
553 | ||
554 | if (pid < 0) | |
555 | perror_with_name ("vfork"); | |
556 | ||
557 | if (pid == 0) | |
558 | { | |
559 | if (debug_fork) | |
560 | sleep (debug_fork); | |
561 | ||
562 | #ifdef TIOCGPGRP | |
563 | /* Run inferior in a separate process group. */ | |
30875e1c SG |
564 | #ifdef NEED_POSIX_SETPGID |
565 | debug_setpgrp = setpgid (0, 0); | |
566 | #else | |
818de002 | 567 | #if defined(USG) && !defined(SETPGRP_ARGS) |
150f5436 FF |
568 | debug_setpgrp = setpgrp (); |
569 | #else | |
bd5635a1 | 570 | debug_setpgrp = setpgrp (getpid (), getpid ()); |
30875e1c SG |
571 | #endif /* USG */ |
572 | #endif /* NEED_POSIX_SETPGID */ | |
680c9dfa | 573 | if (debug_setpgrp == -1) |
bd5635a1 RP |
574 | perror("setpgrp failed in child"); |
575 | #endif /* TIOCGPGRP */ | |
576 | ||
577 | #ifdef SET_STACK_LIMIT_HUGE | |
578 | /* Reset the stack limit back to what it was. */ | |
579 | { | |
580 | struct rlimit rlim; | |
581 | ||
582 | getrlimit (RLIMIT_STACK, &rlim); | |
583 | rlim.rlim_cur = original_stack_limit; | |
584 | setrlimit (RLIMIT_STACK, &rlim); | |
585 | } | |
586 | #endif /* SET_STACK_LIMIT_HUGE */ | |
587 | ||
bdbd5f50 JG |
588 | /* Ask the tty subsystem to switch to the one we specified earlier |
589 | (or to share the current terminal, if none was specified). */ | |
bd5635a1 | 590 | |
bdbd5f50 | 591 | new_tty (); |
bd5635a1 RP |
592 | |
593 | /* Changing the signal handlers for the inferior after | |
594 | a vfork can also change them for the superior, so we don't mess | |
595 | with signals here. See comments in | |
596 | initialize_signals for how we get the right signal handlers | |
597 | for the inferior. */ | |
598 | ||
63ac7ef3 | 599 | #ifdef USE_PROC_FS |
e676a15f FF |
600 | /* Use SVR4 /proc interface */ |
601 | proc_set_exec_trap (); | |
63ac7ef3 | 602 | #else |
e676a15f FF |
603 | /* "Trace me, Dr. Memory!" */ |
604 | call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0); | |
63ac7ef3 | 605 | #endif |
3b271cf4 JG |
606 | |
607 | /* There is no execlpe call, so we have to set the environment | |
608 | for our child in the global variable. If we've vforked, this | |
609 | clobbers the parent, but environ is restored a few lines down | |
610 | in the parent. By the way, yes we do need to look down the | |
611 | path to find $SHELL. Rich Pixley says so, and I agree. */ | |
612 | environ = env; | |
613 | execlp (shell_file, shell_file, "-c", shell_command, (char *)0); | |
bd5635a1 RP |
614 | |
615 | fprintf (stderr, "Cannot exec %s: %s.\n", shell_file, | |
e37a6e9c | 616 | safe_strerror (errno)); |
bd5635a1 RP |
617 | fflush (stderr); |
618 | _exit (0177); | |
619 | } | |
620 | ||
3b271cf4 JG |
621 | /* Restore our environment in case a vforked child clob'd it. */ |
622 | environ = save_our_env; | |
623 | ||
bd5635a1 RP |
624 | /* Now that we have a child process, make it our target. */ |
625 | push_target (&child_ops); | |
626 | ||
627 | #ifdef CREATE_INFERIOR_HOOK | |
628 | CREATE_INFERIOR_HOOK (pid); | |
629 | #endif | |
630 | ||
631 | /* The process was started by the fork that created it, | |
632 | but it will have stopped one instruction after execing the shell. | |
633 | Here we must get it up to actual execution of the real program. */ | |
634 | ||
635 | inferior_pid = pid; /* Needed for wait_for_inferior stuff below */ | |
636 | ||
637 | clear_proceed_status (); | |
638 | ||
bd5635a1 RP |
639 | /* We will get a trace trap after one instruction. |
640 | Continue it automatically. Eventually (after shell does an exec) | |
641 | it will get another trace trap. Then insert breakpoints and continue. */ | |
642 | ||
643 | #ifdef START_INFERIOR_TRAPS_EXPECTED | |
644 | pending_execs = START_INFERIOR_TRAPS_EXPECTED; | |
645 | #else | |
646 | pending_execs = 2; | |
647 | #endif | |
648 | ||
649 | init_wait_for_inferior (); | |
650 | ||
651 | /* Set up the "saved terminal modes" of the inferior | |
652 | based on what modes we are starting it with. */ | |
653 | target_terminal_init (); | |
654 | ||
655 | /* Install inferior's terminal modes. */ | |
656 | target_terminal_inferior (); | |
657 | ||
658 | while (1) | |
659 | { | |
660 | stop_soon_quietly = 1; /* Make wait_for_inferior be quiet */ | |
661 | wait_for_inferior (); | |
662 | if (stop_signal != SIGTRAP) | |
663 | { | |
664 | /* Let shell child handle its own signals in its own way */ | |
665 | /* FIXME, what if child has exit()ed? Must exit loop somehow */ | |
a71d17b1 | 666 | resume (0, stop_signal); |
bd5635a1 RP |
667 | } |
668 | else | |
669 | { | |
670 | /* We handle SIGTRAP, however; it means child did an exec. */ | |
671 | if (0 == --pending_execs) | |
672 | break; | |
a71d17b1 | 673 | resume (0, 0); /* Just make it go on */ |
bd5635a1 RP |
674 | } |
675 | } | |
676 | stop_soon_quietly = 0; | |
677 | ||
bdbd5f50 JG |
678 | /* We are now in the child process of interest, having exec'd the |
679 | correct program, and are poised at the first instruction of the | |
680 | new program. */ | |
681 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
318bf84f | 682 | SOLIB_CREATE_INFERIOR_HOOK (pid); |
bdbd5f50 JG |
683 | #endif |
684 | ||
072b552a JG |
685 | /* Pedal to the metal. Away we go. */ |
686 | proceed ((CORE_ADDR) -1, 0, 0); | |
bd5635a1 RP |
687 | } |
688 | ||
689 | /* Start remote-debugging of a machine over a serial link. */ | |
690 | ||
691 | void | |
692 | start_remote () | |
693 | { | |
694 | init_wait_for_inferior (); | |
695 | clear_proceed_status (); | |
696 | stop_soon_quietly = 1; | |
697 | trap_expected = 0; | |
98885d76 JK |
698 | wait_for_inferior (); |
699 | normal_stop (); | |
bd5635a1 RP |
700 | } |
701 | ||
702 | /* Initialize static vars when a new inferior begins. */ | |
703 | ||
704 | void | |
705 | init_wait_for_inferior () | |
706 | { | |
707 | /* These are meaningless until the first time through wait_for_inferior. */ | |
708 | prev_pc = 0; | |
709 | prev_sp = 0; | |
710 | prev_func_start = 0; | |
711 | prev_func_name = NULL; | |
712 | ||
713 | trap_expected_after_continue = 0; | |
714 | breakpoints_inserted = 0; | |
715 | mark_breakpoints_out (); | |
716 | stop_signal = 0; /* Don't confuse first call to proceed(). */ | |
717 | } | |
718 | ||
719 | ||
720 | /* Attach to process PID, then initialize for debugging it | |
721 | and wait for the trace-trap that results from attaching. */ | |
722 | ||
723 | void | |
724 | child_attach (args, from_tty) | |
725 | char *args; | |
726 | int from_tty; | |
727 | { | |
728 | char *exec_file; | |
729 | int pid; | |
730 | ||
731 | dont_repeat(); | |
732 | ||
733 | if (!args) | |
734 | error_no_arg ("process-id to attach"); | |
735 | ||
736 | #ifndef ATTACH_DETACH | |
737 | error ("Can't attach to a process on this machine."); | |
738 | #else | |
739 | pid = atoi (args); | |
740 | ||
e37a6e9c PB |
741 | if (pid == getpid()) /* Trying to masturbate? */ |
742 | error ("I refuse to debug myself!"); | |
743 | ||
bd5635a1 RP |
744 | if (target_has_execution) |
745 | { | |
746 | if (query ("A program is being debugged already. Kill it? ")) | |
30875e1c | 747 | target_kill (); |
bd5635a1 RP |
748 | else |
749 | error ("Inferior not killed."); | |
750 | } | |
751 | ||
752 | exec_file = (char *) get_exec_file (1); | |
753 | ||
754 | if (from_tty) | |
755 | { | |
756 | printf ("Attaching program: %s pid %d\n", | |
757 | exec_file, pid); | |
758 | fflush (stdout); | |
759 | } | |
760 | ||
761 | attach (pid); | |
762 | inferior_pid = pid; | |
763 | push_target (&child_ops); | |
764 | ||
765 | mark_breakpoints_out (); | |
766 | target_terminal_init (); | |
767 | clear_proceed_status (); | |
768 | stop_soon_quietly = 1; | |
769 | /*proceed (-1, 0, -2);*/ | |
770 | target_terminal_inferior (); | |
771 | wait_for_inferior (); | |
bdbd5f50 | 772 | #ifdef SOLIB_ADD |
1515ff18 | 773 | SOLIB_ADD ((char *)0, from_tty, (struct target_ops *)0); |
bdbd5f50 | 774 | #endif |
bd5635a1 RP |
775 | normal_stop (); |
776 | #endif /* ATTACH_DETACH */ | |
777 | } | |
778 | \f | |
779 | /* Wait for control to return from inferior to debugger. | |
780 | If inferior gets a signal, we may decide to start it up again | |
781 | instead of returning. That is why there is a loop in this function. | |
782 | When this function actually returns it means the inferior | |
783 | should be left stopped and GDB should read more commands. */ | |
784 | ||
785 | void | |
786 | wait_for_inferior () | |
787 | { | |
788 | WAITTYPE w; | |
789 | int another_trap; | |
790 | int random_signal; | |
791 | CORE_ADDR stop_sp; | |
792 | CORE_ADDR stop_func_start; | |
793 | char *stop_func_name; | |
d747e0af | 794 | CORE_ADDR prologue_pc, tmp; |
bd5635a1 RP |
795 | int stop_step_resume_break; |
796 | struct symtab_and_line sal; | |
797 | int remove_breakpoints_on_following_step = 0; | |
b3b39c0c | 798 | int current_line; |
30875e1c | 799 | int handling_longjmp = 0; /* FIXME */ |
bd5635a1 | 800 | |
b3b39c0c SG |
801 | sal = find_pc_line(prev_pc, 0); |
802 | current_line = sal.line; | |
803 | ||
bd5635a1 RP |
804 | while (1) |
805 | { | |
806 | /* Clean up saved state that will become invalid. */ | |
807 | pc_changed = 0; | |
808 | flush_cached_frames (); | |
809 | registers_changed (); | |
810 | ||
811 | target_wait (&w); | |
812 | ||
1eeba686 PB |
813 | #ifdef SIGTRAP_STOP_AFTER_LOAD |
814 | ||
815 | /* Somebody called load(2), and it gave us a "trap signal after load". | |
816 | Ignore it gracefully. */ | |
817 | ||
818 | SIGTRAP_STOP_AFTER_LOAD (w); | |
819 | #endif | |
820 | ||
bd5635a1 RP |
821 | /* See if the process still exists; clean up if it doesn't. */ |
822 | if (WIFEXITED (w)) | |
823 | { | |
824 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
825 | if (WEXITSTATUS (w)) | |
e37a6e9c | 826 | printf_filtered ("\nProgram exited with code 0%o.\n", |
bd5635a1 RP |
827 | (unsigned int)WEXITSTATUS (w)); |
828 | else | |
829 | if (!batch_mode()) | |
e37a6e9c | 830 | printf_filtered ("\nProgram exited normally.\n"); |
bd5635a1 RP |
831 | fflush (stdout); |
832 | target_mourn_inferior (); | |
833 | #ifdef NO_SINGLE_STEP | |
834 | one_stepped = 0; | |
835 | #endif | |
836 | stop_print_frame = 0; | |
837 | break; | |
838 | } | |
839 | else if (!WIFSTOPPED (w)) | |
840 | { | |
841 | stop_print_frame = 0; | |
842 | stop_signal = WTERMSIG (w); | |
843 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
30875e1c | 844 | target_kill (); /* kill mourns as well */ |
bd5635a1 | 845 | #ifdef PRINT_RANDOM_SIGNAL |
e37a6e9c | 846 | printf_filtered ("\nProgram terminated: "); |
bd5635a1 RP |
847 | PRINT_RANDOM_SIGNAL (stop_signal); |
848 | #else | |
e37a6e9c PB |
849 | printf_filtered ("\nProgram terminated with signal %d, %s\n", |
850 | stop_signal, safe_strsignal (stop_signal)); | |
bd5635a1 | 851 | #endif |
e37a6e9c | 852 | printf_filtered ("The inferior process no longer exists.\n"); |
bd5635a1 RP |
853 | fflush (stdout); |
854 | #ifdef NO_SINGLE_STEP | |
855 | one_stepped = 0; | |
856 | #endif | |
857 | break; | |
858 | } | |
859 | ||
860 | #ifdef NO_SINGLE_STEP | |
861 | if (one_stepped) | |
862 | single_step (0); /* This actually cleans up the ss */ | |
863 | #endif /* NO_SINGLE_STEP */ | |
864 | ||
865 | stop_pc = read_pc (); | |
866 | set_current_frame ( create_new_frame (read_register (FP_REGNUM), | |
867 | read_pc ())); | |
868 | ||
869 | stop_frame_address = FRAME_FP (get_current_frame ()); | |
870 | stop_sp = read_register (SP_REGNUM); | |
871 | stop_func_start = 0; | |
872 | stop_func_name = 0; | |
873 | /* Don't care about return value; stop_func_start and stop_func_name | |
874 | will both be 0 if it doesn't work. */ | |
072b552a | 875 | find_pc_partial_function (stop_pc, &stop_func_name, &stop_func_start); |
bd5635a1 RP |
876 | stop_func_start += FUNCTION_START_OFFSET; |
877 | another_trap = 0; | |
878 | bpstat_clear (&stop_bpstat); | |
879 | stop_step = 0; | |
880 | stop_stack_dummy = 0; | |
881 | stop_print_frame = 1; | |
882 | stop_step_resume_break = 0; | |
883 | random_signal = 0; | |
884 | stopped_by_random_signal = 0; | |
885 | breakpoints_failed = 0; | |
886 | ||
887 | /* Look at the cause of the stop, and decide what to do. | |
888 | The alternatives are: | |
889 | 1) break; to really stop and return to the debugger, | |
890 | 2) drop through to start up again | |
891 | (set another_trap to 1 to single step once) | |
892 | 3) set random_signal to 1, and the decision between 1 and 2 | |
893 | will be made according to the signal handling tables. */ | |
894 | ||
895 | stop_signal = WSTOPSIG (w); | |
896 | ||
897 | /* First, distinguish signals caused by the debugger from signals | |
898 | that have to do with the program's own actions. | |
899 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
900 | or SIGEMT, depending on the operating system version. | |
901 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
902 | and change it to SIGTRAP. */ | |
903 | ||
904 | if (stop_signal == SIGTRAP | |
905 | || (breakpoints_inserted && | |
906 | (stop_signal == SIGILL | |
e37a6e9c PB |
907 | #ifdef SIGEMT |
908 | || stop_signal == SIGEMT | |
909 | #endif | |
910 | )) | |
bd5635a1 RP |
911 | || stop_soon_quietly) |
912 | { | |
913 | if (stop_signal == SIGTRAP && stop_after_trap) | |
914 | { | |
915 | stop_print_frame = 0; | |
916 | break; | |
917 | } | |
918 | if (stop_soon_quietly) | |
919 | break; | |
920 | ||
921 | /* Don't even think about breakpoints | |
922 | if just proceeded over a breakpoint. | |
923 | ||
924 | However, if we are trying to proceed over a breakpoint | |
925 | and end up in sigtramp, then step_resume_break_address | |
926 | will be set and we should check whether we've hit the | |
927 | step breakpoint. */ | |
928 | if (stop_signal == SIGTRAP && trap_expected | |
818de002 | 929 | && step_resume_break_address == 0) |
bd5635a1 RP |
930 | bpstat_clear (&stop_bpstat); |
931 | else | |
932 | { | |
933 | /* See if there is a breakpoint at the current PC. */ | |
934 | #if DECR_PC_AFTER_BREAK | |
935 | /* Notice the case of stepping through a jump | |
30875e1c | 936 | that lands just after a breakpoint. |
bd5635a1 RP |
937 | Don't confuse that with hitting the breakpoint. |
938 | What we check for is that 1) stepping is going on | |
939 | and 2) the pc before the last insn does not match | |
940 | the address of the breakpoint before the current pc. */ | |
30875e1c SG |
941 | if (prev_pc == stop_pc - DECR_PC_AFTER_BREAK |
942 | || !step_range_end | |
943 | || step_resume_break_address | |
944 | || handling_longjmp /* FIXME */) | |
bd5635a1 RP |
945 | #endif /* DECR_PC_AFTER_BREAK not zero */ |
946 | { | |
947 | /* See if we stopped at the special breakpoint for | |
948 | stepping over a subroutine call. If both are zero, | |
949 | this wasn't the reason for the stop. */ | |
30875e1c SG |
950 | if (step_resume_break_address |
951 | && stop_pc - DECR_PC_AFTER_BREAK | |
952 | == step_resume_break_address) | |
bd5635a1 RP |
953 | { |
954 | stop_step_resume_break = 1; | |
955 | if (DECR_PC_AFTER_BREAK) | |
956 | { | |
957 | stop_pc -= DECR_PC_AFTER_BREAK; | |
958 | write_register (PC_REGNUM, stop_pc); | |
959 | pc_changed = 0; | |
960 | } | |
961 | } | |
962 | else | |
963 | { | |
964 | stop_bpstat = | |
965 | bpstat_stop_status (&stop_pc, stop_frame_address); | |
966 | /* Following in case break condition called a | |
967 | function. */ | |
968 | stop_print_frame = 1; | |
969 | } | |
970 | } | |
971 | } | |
972 | ||
973 | if (stop_signal == SIGTRAP) | |
974 | random_signal | |
975 | = !(bpstat_explains_signal (stop_bpstat) | |
976 | || trap_expected | |
977 | || stop_step_resume_break | |
978 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) | |
979 | || (step_range_end && !step_resume_break_address)); | |
980 | else | |
981 | { | |
982 | random_signal | |
983 | = !(bpstat_explains_signal (stop_bpstat) | |
984 | || stop_step_resume_break | |
985 | /* End of a stack dummy. Some systems (e.g. Sony | |
986 | news) give another signal besides SIGTRAP, | |
987 | so check here as well as above. */ | |
d747e0af | 988 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) |
bd5635a1 RP |
989 | ); |
990 | if (!random_signal) | |
991 | stop_signal = SIGTRAP; | |
992 | } | |
993 | } | |
994 | else | |
995 | random_signal = 1; | |
996 | ||
997 | /* For the program's own signals, act according to | |
998 | the signal handling tables. */ | |
999 | ||
1000 | if (random_signal) | |
1001 | { | |
1002 | /* Signal not for debugging purposes. */ | |
1003 | int printed = 0; | |
1004 | ||
1005 | stopped_by_random_signal = 1; | |
1006 | ||
1007 | if (stop_signal >= NSIG | |
1008 | || signal_print[stop_signal]) | |
1009 | { | |
1010 | printed = 1; | |
1011 | target_terminal_ours_for_output (); | |
1012 | #ifdef PRINT_RANDOM_SIGNAL | |
1013 | PRINT_RANDOM_SIGNAL (stop_signal); | |
1014 | #else | |
e37a6e9c PB |
1015 | printf_filtered ("\nProgram received signal %d, %s\n", |
1016 | stop_signal, safe_strsignal (stop_signal)); | |
bd5635a1 RP |
1017 | #endif /* PRINT_RANDOM_SIGNAL */ |
1018 | fflush (stdout); | |
1019 | } | |
1020 | if (stop_signal >= NSIG | |
1021 | || signal_stop[stop_signal]) | |
1022 | break; | |
1023 | /* If not going to stop, give terminal back | |
1024 | if we took it away. */ | |
1025 | else if (printed) | |
1026 | target_terminal_inferior (); | |
b7f81b57 JG |
1027 | |
1028 | /* Note that virtually all the code below does `if !random_signal'. | |
1029 | Perhaps this code should end with a goto or continue. At least | |
1030 | one (now fixed) bug was caused by this -- a !random_signal was | |
1031 | missing in one of the tests below. */ | |
bd5635a1 | 1032 | } |
30875e1c | 1033 | |
bd5635a1 | 1034 | /* Handle cases caused by hitting a breakpoint. */ |
bd5635a1 | 1035 | |
30875e1c SG |
1036 | if (!random_signal) |
1037 | if (bpstat_explains_signal (stop_bpstat)) | |
1038 | { | |
1039 | CORE_ADDR jmp_buf_pc; | |
1040 | ||
1041 | switch (stop_bpstat->breakpoint_at->type) /* FIXME */ | |
1042 | { | |
1043 | /* If we hit the breakpoint at longjmp, disable it for the | |
1044 | duration of this command. Then, install a temporary | |
1045 | breakpoint at the target of the jmp_buf. */ | |
1046 | case bp_longjmp: | |
1047 | disable_longjmp_breakpoint(); | |
1048 | remove_breakpoints (); | |
1049 | breakpoints_inserted = 0; | |
1050 | if (!GET_LONGJMP_TARGET(&jmp_buf_pc)) goto keep_going; | |
1051 | ||
1052 | /* Need to blow away step-resume breakpoint, as it | |
1053 | interferes with us */ | |
1054 | remove_step_breakpoint (); | |
818de002 | 1055 | step_resume_break_address = 0; |
30875e1c SG |
1056 | stop_step_resume_break = 0; |
1057 | ||
1058 | #if 0 /* FIXME - Need to implement nested temporary breakpoints */ | |
1059 | if (step_over_calls > 0) | |
1060 | set_longjmp_resume_breakpoint(jmp_buf_pc, | |
1061 | get_current_frame()); | |
1062 | else | |
1063 | #endif /* 0 */ | |
1064 | set_longjmp_resume_breakpoint(jmp_buf_pc, NULL); | |
1065 | handling_longjmp = 1; /* FIXME */ | |
1066 | goto keep_going; | |
1067 | ||
1068 | case bp_longjmp_resume: | |
1069 | remove_breakpoints (); | |
1070 | breakpoints_inserted = 0; | |
1071 | #if 0 /* FIXME - Need to implement nested temporary breakpoints */ | |
1072 | if (step_over_calls | |
1073 | && (stop_frame_address | |
1074 | INNER_THAN step_frame_address)) | |
1075 | { | |
1076 | another_trap = 1; | |
1077 | goto keep_going; | |
1078 | } | |
1079 | #endif /* 0 */ | |
1080 | disable_longjmp_breakpoint(); | |
1081 | handling_longjmp = 0; /* FIXME */ | |
1082 | break; | |
1083 | ||
1084 | default: | |
1085 | fprintf(stderr, "Unknown breakpoint type %d\n", | |
1086 | stop_bpstat->breakpoint_at->type); | |
1087 | case bp_watchpoint: | |
1088 | case bp_breakpoint: | |
1089 | case bp_until: | |
1090 | case bp_finish: | |
1091 | /* Does a breakpoint want us to stop? */ | |
1092 | if (bpstat_stop (stop_bpstat)) | |
1093 | { | |
1094 | stop_print_frame = bpstat_should_print (stop_bpstat); | |
1095 | goto stop_stepping; | |
1096 | } | |
1097 | /* Otherwise, must remove breakpoints and single-step | |
1098 | to get us past the one we hit. */ | |
1099 | else | |
1100 | { | |
1101 | remove_breakpoints (); | |
1102 | remove_step_breakpoint (); | |
1103 | breakpoints_inserted = 0; | |
1104 | another_trap = 1; | |
1105 | } | |
1106 | break; | |
1107 | } | |
1108 | } | |
1109 | else if (stop_step_resume_break) | |
1110 | { | |
1111 | /* But if we have hit the step-resumption breakpoint, | |
1112 | remove it. It has done its job getting us here. | |
1113 | The sp test is to make sure that we don't get hung | |
1114 | up in recursive calls in functions without frame | |
1115 | pointers. If the stack pointer isn't outside of | |
1116 | where the breakpoint was set (within a routine to be | |
1117 | stepped over), we're in the middle of a recursive | |
1118 | call. Not true for reg window machines (sparc) | |
1119 | because the must change frames to call things and | |
1120 | the stack pointer doesn't have to change if it | |
1121 | the bp was set in a routine without a frame (pc can | |
1122 | be stored in some other window). | |
1123 | ||
1124 | The removal of the sp test is to allow calls to | |
1125 | alloca. Nasty things were happening. Oh, well, | |
1126 | gdb can only handle one level deep of lack of | |
1127 | frame pointer. */ | |
1128 | ||
1129 | /* | |
1130 | Disable test for step_frame_address match so that we always stop even if the | |
1131 | frames don't match. Reason: if we hit the step_resume_breakpoint, there is | |
1132 | no way to temporarily disable it so that we can step past it. If we leave | |
1133 | the breakpoint in, then we loop forever repeatedly hitting, but never | |
1134 | getting past the breakpoint. This change keeps nexting over recursive | |
1135 | function calls from hanging gdb. | |
1136 | */ | |
1137 | #if 0 | |
1138 | if (* step_frame_address == 0 | |
1139 | || (step_frame_address == stop_frame_address)) | |
cc221e76 | 1140 | #endif |
30875e1c SG |
1141 | { |
1142 | remove_step_breakpoint (); | |
1143 | step_resume_break_address = 0; | |
1144 | ||
1145 | /* If were waiting for a trap, hitting the step_resume_break | |
1146 | doesn't count as getting it. */ | |
1147 | if (trap_expected) | |
1148 | another_trap = 1; | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | /* We come here if we hit a breakpoint but should not | |
1153 | stop for it. Possibly we also were stepping | |
1154 | and should stop for that. So fall through and | |
1155 | test for stepping. But, if not stepping, | |
1156 | do not stop. */ | |
1157 | ||
bd5635a1 RP |
1158 | /* If this is the breakpoint at the end of a stack dummy, |
1159 | just stop silently. */ | |
b7f81b57 JG |
1160 | if (!random_signal |
1161 | && PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)) | |
bd5635a1 RP |
1162 | { |
1163 | stop_print_frame = 0; | |
1164 | stop_stack_dummy = 1; | |
1165 | #ifdef HP_OS_BUG | |
1166 | trap_expected_after_continue = 1; | |
1167 | #endif | |
1168 | break; | |
1169 | } | |
1170 | ||
1171 | if (step_resume_break_address) | |
1172 | /* Having a step-resume breakpoint overrides anything | |
1173 | else having to do with stepping commands until | |
1174 | that breakpoint is reached. */ | |
1175 | ; | |
1176 | /* If stepping through a line, keep going if still within it. */ | |
1177 | else if (!random_signal | |
1178 | && step_range_end | |
1179 | && stop_pc >= step_range_start | |
1180 | && stop_pc < step_range_end | |
1181 | /* The step range might include the start of the | |
1182 | function, so if we are at the start of the | |
1183 | step range and either the stack or frame pointers | |
1184 | just changed, we've stepped outside */ | |
1185 | && !(stop_pc == step_range_start | |
1186 | && stop_frame_address | |
1187 | && (stop_sp INNER_THAN prev_sp | |
1188 | || stop_frame_address != step_frame_address))) | |
1189 | { | |
d747e0af | 1190 | ; |
bd5635a1 RP |
1191 | } |
1192 | ||
1193 | /* We stepped out of the stepping range. See if that was due | |
1194 | to a subroutine call that we should proceed to the end of. */ | |
1195 | else if (!random_signal && step_range_end) | |
1196 | { | |
1197 | if (stop_func_start) | |
1198 | { | |
1199 | prologue_pc = stop_func_start; | |
1200 | SKIP_PROLOGUE (prologue_pc); | |
1201 | } | |
1202 | ||
1203 | /* Did we just take a signal? */ | |
1204 | if (IN_SIGTRAMP (stop_pc, stop_func_name) | |
1205 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) | |
1206 | { | |
1207 | /* This code is needed at least in the following case: | |
1208 | The user types "next" and then a signal arrives (before | |
1209 | the "next" is done). */ | |
1210 | /* We've just taken a signal; go until we are back to | |
1211 | the point where we took it and one more. */ | |
1212 | step_resume_break_address = prev_pc; | |
1213 | step_resume_break_duplicate = | |
1214 | breakpoint_here_p (step_resume_break_address); | |
1215 | if (breakpoints_inserted) | |
1216 | insert_step_breakpoint (); | |
1217 | /* Make sure that the stepping range gets us past | |
1218 | that instruction. */ | |
1219 | if (step_range_end == 1) | |
1220 | step_range_end = (step_range_start = prev_pc) + 1; | |
1221 | remove_breakpoints_on_following_step = 1; | |
d747e0af | 1222 | goto save_pc; |
bd5635a1 RP |
1223 | } |
1224 | ||
1225 | /* ==> See comments at top of file on this algorithm. <==*/ | |
1226 | ||
1eeba686 PB |
1227 | if ((stop_pc == stop_func_start |
1228 | || IN_SOLIB_TRAMPOLINE (stop_pc, stop_func_name)) | |
1229 | && (stop_func_start != prev_func_start | |
1230 | || prologue_pc != stop_func_start | |
1231 | || stop_sp != prev_sp)) | |
bd5635a1 | 1232 | { |
d747e0af MT |
1233 | /* It's a subroutine call. |
1234 | (0) If we are not stepping over any calls ("stepi"), we | |
1235 | just stop. | |
1236 | (1) If we're doing a "next", we want to continue through | |
1237 | the call ("step over the call"). | |
1238 | (2) If we are in a function-call trampoline (a stub between | |
1239 | the calling routine and the real function), locate | |
1240 | the real function and change stop_func_start. | |
1241 | (3) If we're doing a "step", and there are no debug symbols | |
1242 | at the target of the call, we want to continue through | |
1243 | it ("step over the call"). | |
1244 | (4) Otherwise, we want to stop soon, after the function | |
1245 | prologue ("step into the call"). */ | |
1246 | ||
1247 | if (step_over_calls == 0) | |
bd5635a1 | 1248 | { |
d747e0af MT |
1249 | /* I presume that step_over_calls is only 0 when we're |
1250 | supposed to be stepping at the assembly language level. */ | |
1251 | stop_step = 1; | |
1252 | break; | |
1253 | } | |
30875e1c | 1254 | |
d747e0af MT |
1255 | if (step_over_calls > 0) |
1256 | goto step_over_function; | |
30875e1c | 1257 | |
d747e0af | 1258 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); |
318bf84f | 1259 | if (tmp != 0) |
d747e0af MT |
1260 | stop_func_start = tmp; |
1261 | ||
1262 | if (find_pc_function (stop_func_start) != 0) | |
1263 | goto step_into_function; | |
1264 | ||
1265 | step_over_function: | |
1266 | /* A subroutine call has happened. */ | |
1267 | /* Set a special breakpoint after the return */ | |
1268 | step_resume_break_address = | |
1269 | ADDR_BITS_REMOVE | |
1270 | (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
1271 | step_resume_break_duplicate | |
1272 | = breakpoint_here_p (step_resume_break_address); | |
1273 | if (breakpoints_inserted) | |
1274 | insert_step_breakpoint (); | |
1275 | goto save_pc; | |
1276 | ||
1277 | step_into_function: | |
bd5635a1 RP |
1278 | /* Subroutine call with source code we should not step over. |
1279 | Do step to the first line of code in it. */ | |
d747e0af MT |
1280 | SKIP_PROLOGUE (stop_func_start); |
1281 | sal = find_pc_line (stop_func_start, 0); | |
1282 | /* Use the step_resume_break to step until | |
1283 | the end of the prologue, even if that involves jumps | |
1284 | (as it seems to on the vax under 4.2). */ | |
1285 | /* If the prologue ends in the middle of a source line, | |
1286 | continue to the end of that source line. | |
1287 | Otherwise, just go to end of prologue. */ | |
bd5635a1 | 1288 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP |
d747e0af MT |
1289 | /* no, don't either. It skips any code that's |
1290 | legitimately on the first line. */ | |
bd5635a1 | 1291 | #else |
d747e0af MT |
1292 | if (sal.end && sal.pc != stop_func_start) |
1293 | stop_func_start = sal.end; | |
bd5635a1 | 1294 | #endif |
d747e0af MT |
1295 | |
1296 | if (stop_func_start == stop_pc) | |
30875e1c | 1297 | { |
d747e0af | 1298 | /* We are already there: stop now. */ |
30875e1c SG |
1299 | stop_step = 1; |
1300 | break; | |
d747e0af MT |
1301 | } |
1302 | else | |
1303 | /* Put the step-breakpoint there and go until there. */ | |
30875e1c | 1304 | { |
d747e0af MT |
1305 | step_resume_break_address = stop_func_start; |
1306 | ||
1307 | step_resume_break_duplicate | |
1308 | = breakpoint_here_p (step_resume_break_address); | |
1309 | if (breakpoints_inserted) | |
1310 | insert_step_breakpoint (); | |
1311 | /* Do not specify what the fp should be when we stop | |
1312 | since on some machines the prologue | |
1313 | is where the new fp value is established. */ | |
1314 | step_frame_address = 0; | |
1315 | /* And make sure stepping stops right away then. */ | |
1316 | step_range_end = step_range_start; | |
30875e1c | 1317 | } |
d747e0af | 1318 | goto save_pc; |
bd5635a1 | 1319 | } |
d747e0af MT |
1320 | |
1321 | /* We've wandered out of the step range (but haven't done a | |
1322 | subroutine call or return). */ | |
1323 | ||
1324 | sal = find_pc_line(stop_pc, 0); | |
1325 | ||
1326 | if (step_range_end == 1 || /* stepi or nexti */ | |
1327 | sal.line == 0 || /* ...or no line # info */ | |
1328 | (stop_pc == sal.pc /* ...or we're at the start */ | |
1329 | && current_line != sal.line)) { /* of a different line */ | |
1330 | /* Stop because we're done stepping. */ | |
1331 | stop_step = 1; | |
1332 | break; | |
1333 | } else { | |
1334 | /* We aren't done stepping, and we have line number info for $pc. | |
1335 | Optimize by setting the step_range for the line. | |
1336 | (We might not be in the original line, but if we entered a | |
1337 | new line in mid-statement, we continue stepping. This makes | |
1338 | things like for(;;) statements work better.) */ | |
1339 | step_range_start = sal.pc; | |
1340 | step_range_end = sal.end; | |
1341 | goto save_pc; | |
1342 | } | |
318bf84f | 1343 | /* We never fall through here */ |
bd5635a1 RP |
1344 | } |
1345 | ||
d747e0af MT |
1346 | if (trap_expected |
1347 | && IN_SIGTRAMP (stop_pc, stop_func_name) | |
1348 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) | |
bd5635a1 RP |
1349 | { |
1350 | /* What has happened here is that we have just stepped the inferior | |
1351 | with a signal (because it is a signal which shouldn't make | |
1352 | us stop), thus stepping into sigtramp. | |
1353 | ||
1354 | So we need to set a step_resume_break_address breakpoint | |
1355 | and continue until we hit it, and then step. */ | |
1356 | step_resume_break_address = prev_pc; | |
1357 | /* Always 1, I think, but it's probably easier to have | |
1358 | the step_resume_break as usual rather than trying to | |
1359 | re-use the breakpoint which is already there. */ | |
1360 | step_resume_break_duplicate = | |
1361 | breakpoint_here_p (step_resume_break_address); | |
1362 | if (breakpoints_inserted) | |
1363 | insert_step_breakpoint (); | |
1364 | remove_breakpoints_on_following_step = 1; | |
1365 | another_trap = 1; | |
1366 | } | |
1367 | ||
30875e1c SG |
1368 | /* My apologies to the gods of structured programming. */ |
1369 | /* Come to this label when you need to resume the inferior. It's really much | |
1370 | cleaner at this time to do a goto than to try and figure out what the | |
1371 | if-else chain ought to look like!! */ | |
1372 | ||
1373 | keep_going: | |
1374 | ||
d747e0af | 1375 | save_pc: |
bd5635a1 RP |
1376 | /* Save the pc before execution, to compare with pc after stop. */ |
1377 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
1378 | prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER | |
1379 | BREAK is defined, the | |
1380 | original pc would not have | |
1381 | been at the start of a | |
1382 | function. */ | |
1383 | prev_func_name = stop_func_name; | |
1384 | prev_sp = stop_sp; | |
1385 | ||
1386 | /* If we did not do break;, it means we should keep | |
1387 | running the inferior and not return to debugger. */ | |
1388 | ||
1389 | if (trap_expected && stop_signal != SIGTRAP) | |
1390 | { | |
1391 | /* We took a signal (which we are supposed to pass through to | |
1392 | the inferior, else we'd have done a break above) and we | |
1393 | haven't yet gotten our trap. Simply continue. */ | |
a71d17b1 | 1394 | resume ((step_range_end && !step_resume_break_address) |
bd5635a1 RP |
1395 | || (trap_expected && !step_resume_break_address) |
1396 | || bpstat_should_step (), | |
1397 | stop_signal); | |
1398 | } | |
1399 | else | |
1400 | { | |
1401 | /* Either the trap was not expected, but we are continuing | |
1402 | anyway (the user asked that this signal be passed to the | |
1403 | child) | |
1404 | -- or -- | |
1405 | The signal was SIGTRAP, e.g. it was our signal, but we | |
1406 | decided we should resume from it. | |
1407 | ||
1408 | We're going to run this baby now! | |
1409 | ||
1410 | Insert breakpoints now, unless we are trying | |
1411 | to one-proceed past a breakpoint. */ | |
1412 | /* If we've just finished a special step resume and we don't | |
1413 | want to hit a breakpoint, pull em out. */ | |
1414 | if (!step_resume_break_address && | |
1415 | remove_breakpoints_on_following_step) | |
1416 | { | |
1417 | remove_breakpoints_on_following_step = 0; | |
1418 | remove_breakpoints (); | |
1419 | breakpoints_inserted = 0; | |
1420 | } | |
1421 | else if (!breakpoints_inserted && | |
818de002 | 1422 | (step_resume_break_address != 0 || !another_trap)) |
bd5635a1 RP |
1423 | { |
1424 | insert_step_breakpoint (); | |
1425 | breakpoints_failed = insert_breakpoints (); | |
1426 | if (breakpoints_failed) | |
1427 | break; | |
1428 | breakpoints_inserted = 1; | |
1429 | } | |
1430 | ||
1431 | trap_expected = another_trap; | |
1432 | ||
1433 | if (stop_signal == SIGTRAP) | |
1434 | stop_signal = 0; | |
1435 | ||
1436 | #ifdef SHIFT_INST_REGS | |
1437 | /* I'm not sure when this following segment applies. I do know, now, | |
1438 | that we shouldn't rewrite the regs when we were stopped by a | |
1439 | random signal from the inferior process. */ | |
1440 | ||
d11c44f1 JG |
1441 | if (!bpstat_explains_signal (stop_bpstat) |
1442 | && (stop_signal != SIGCLD) | |
bd5635a1 RP |
1443 | && !stopped_by_random_signal) |
1444 | { | |
1445 | CORE_ADDR pc_contents = read_register (PC_REGNUM); | |
1446 | CORE_ADDR npc_contents = read_register (NPC_REGNUM); | |
1447 | if (pc_contents != npc_contents) | |
1448 | { | |
1449 | write_register (NNPC_REGNUM, npc_contents); | |
1450 | write_register (NPC_REGNUM, pc_contents); | |
1451 | } | |
1452 | } | |
1453 | #endif /* SHIFT_INST_REGS */ | |
1454 | ||
30875e1c SG |
1455 | resume ((!step_resume_break_address |
1456 | && !handling_longjmp | |
1457 | && (step_range_end | |
1458 | || trap_expected)) | |
bd5635a1 RP |
1459 | || bpstat_should_step (), |
1460 | stop_signal); | |
1461 | } | |
1462 | } | |
30875e1c SG |
1463 | |
1464 | stop_stepping: | |
bd5635a1 RP |
1465 | if (target_has_execution) |
1466 | { | |
1467 | /* Assuming the inferior still exists, set these up for next | |
1468 | time, just like we did above if we didn't break out of the | |
1469 | loop. */ | |
1470 | prev_pc = read_pc (); | |
1471 | prev_func_start = stop_func_start; | |
1472 | prev_func_name = stop_func_name; | |
1473 | prev_sp = stop_sp; | |
1474 | } | |
1475 | } | |
1476 | \f | |
1477 | /* Here to return control to GDB when the inferior stops for real. | |
1478 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
1479 | ||
1480 | STOP_PRINT_FRAME nonzero means print the executing frame | |
1481 | (pc, function, args, file, line number and line text). | |
1482 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
1483 | attempting to insert breakpoints. */ | |
1484 | ||
1485 | void | |
1486 | normal_stop () | |
1487 | { | |
1488 | /* Make sure that the current_frame's pc is correct. This | |
1489 | is a correction for setting up the frame info before doing | |
1490 | DECR_PC_AFTER_BREAK */ | |
1491 | if (target_has_execution) | |
1492 | (get_current_frame ())->pc = read_pc (); | |
1493 | ||
1494 | if (breakpoints_failed) | |
1495 | { | |
1496 | target_terminal_ours_for_output (); | |
1497 | print_sys_errmsg ("ptrace", breakpoints_failed); | |
e37a6e9c | 1498 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
bd5635a1 RP |
1499 | The same program may be running in another process.\n"); |
1500 | } | |
1501 | ||
1502 | if (target_has_execution) | |
1503 | remove_step_breakpoint (); | |
1504 | ||
1505 | if (target_has_execution && breakpoints_inserted) | |
1506 | if (remove_breakpoints ()) | |
1507 | { | |
1508 | target_terminal_ours_for_output (); | |
e37a6e9c | 1509 | printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\ |
bd5635a1 RP |
1510 | It might be running in another process.\n\ |
1511 | Further execution is probably impossible.\n"); | |
1512 | } | |
1513 | ||
1514 | breakpoints_inserted = 0; | |
1515 | ||
1516 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
1517 | Delete any breakpoint that is to be deleted at the next stop. */ | |
1518 | ||
1519 | breakpoint_auto_delete (stop_bpstat); | |
1520 | ||
1521 | /* If an auto-display called a function and that got a signal, | |
1522 | delete that auto-display to avoid an infinite recursion. */ | |
1523 | ||
1524 | if (stopped_by_random_signal) | |
1525 | disable_current_display (); | |
1526 | ||
1527 | if (step_multi && stop_step) | |
1528 | return; | |
1529 | ||
1530 | target_terminal_ours (); | |
1531 | ||
1532 | if (!target_has_stack) | |
1533 | return; | |
1534 | ||
1535 | /* Select innermost stack frame except on return from a stack dummy routine, | |
1515ff18 JG |
1536 | or if the program has exited. Print it without a level number if |
1537 | we have changed functions or hit a breakpoint. Print source line | |
1538 | if we have one. */ | |
bd5635a1 RP |
1539 | if (!stop_stack_dummy) |
1540 | { | |
1541 | select_frame (get_current_frame (), 0); | |
1542 | ||
1543 | if (stop_print_frame) | |
1544 | { | |
1515ff18 JG |
1545 | int source_only; |
1546 | ||
1547 | source_only = bpstat_print (stop_bpstat); | |
1548 | source_only = source_only || | |
1549 | ( stop_step | |
bd5635a1 | 1550 | && step_frame_address == stop_frame_address |
1515ff18 JG |
1551 | && step_start_function == find_pc_function (stop_pc)); |
1552 | ||
1553 | print_stack_frame (selected_frame, -1, source_only? -1: 1); | |
bd5635a1 RP |
1554 | |
1555 | /* Display the auto-display expressions. */ | |
1556 | do_displays (); | |
1557 | } | |
1558 | } | |
1559 | ||
1560 | /* Save the function value return registers, if we care. | |
1561 | We might be about to restore their previous contents. */ | |
1562 | if (proceed_to_finish) | |
1563 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
1564 | ||
1565 | if (stop_stack_dummy) | |
1566 | { | |
1567 | /* Pop the empty frame that contains the stack dummy. | |
1568 | POP_FRAME ends with a setting of the current frame, so we | |
1569 | can use that next. */ | |
1570 | POP_FRAME; | |
1571 | select_frame (get_current_frame (), 0); | |
1572 | } | |
1573 | } | |
1574 | \f | |
1575 | static void | |
1576 | insert_step_breakpoint () | |
1577 | { | |
1578 | if (step_resume_break_address && !step_resume_break_duplicate) | |
1579 | target_insert_breakpoint (step_resume_break_address, | |
1580 | step_resume_break_shadow); | |
1581 | } | |
1582 | ||
1583 | static void | |
1584 | remove_step_breakpoint () | |
1585 | { | |
1586 | if (step_resume_break_address && !step_resume_break_duplicate) | |
1587 | target_remove_breakpoint (step_resume_break_address, | |
1588 | step_resume_break_shadow); | |
1589 | } | |
1590 | \f | |
cc221e76 FF |
1591 | int signal_stop_state (signo) |
1592 | int signo; | |
1593 | { | |
1594 | return ((signo >= 0 && signo < NSIG) ? signal_stop[signo] : 0); | |
1595 | } | |
1596 | ||
1597 | int signal_print_state (signo) | |
1598 | int signo; | |
1599 | { | |
1600 | return ((signo >= 0 && signo < NSIG) ? signal_print[signo] : 0); | |
1601 | } | |
1602 | ||
1603 | int signal_pass_state (signo) | |
1604 | int signo; | |
1605 | { | |
1606 | return ((signo >= 0 && signo < NSIG) ? signal_program[signo] : 0); | |
1607 | } | |
1608 | ||
bd5635a1 RP |
1609 | static void |
1610 | sig_print_header () | |
1611 | { | |
1612 | printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n"); | |
1613 | } | |
1614 | ||
1615 | static void | |
1616 | sig_print_info (number) | |
1617 | int number; | |
1618 | { | |
e37a6e9c PB |
1619 | char *name; |
1620 | ||
1621 | if ((name = strsigno (number)) == NULL) | |
bd5635a1 RP |
1622 | printf_filtered ("%d\t\t", number); |
1623 | else | |
e37a6e9c | 1624 | printf_filtered ("%s (%d)\t", name, number); |
bd5635a1 RP |
1625 | printf_filtered ("%s\t", signal_stop[number] ? "Yes" : "No"); |
1626 | printf_filtered ("%s\t", signal_print[number] ? "Yes" : "No"); | |
1627 | printf_filtered ("%s\t\t", signal_program[number] ? "Yes" : "No"); | |
e37a6e9c | 1628 | printf_filtered ("%s\n", safe_strsignal (number)); |
bd5635a1 RP |
1629 | } |
1630 | ||
1631 | /* Specify how various signals in the inferior should be handled. */ | |
1632 | ||
1633 | static void | |
1634 | handle_command (args, from_tty) | |
1635 | char *args; | |
1636 | int from_tty; | |
1637 | { | |
072b552a JG |
1638 | char **argv; |
1639 | int digits, wordlen; | |
1640 | int sigfirst, signum, siglast; | |
1641 | int allsigs; | |
1642 | int nsigs; | |
1643 | unsigned char *sigs; | |
1644 | struct cleanup *old_chain; | |
1645 | ||
1646 | if (args == NULL) | |
1647 | { | |
1648 | error_no_arg ("signal to handle"); | |
1649 | } | |
bd5635a1 | 1650 | |
072b552a JG |
1651 | /* Allocate and zero an array of flags for which signals to handle. */ |
1652 | ||
1653 | nsigs = signo_max () + 1; | |
1654 | sigs = (unsigned char *) alloca (nsigs); | |
1655 | memset (sigs, 0, nsigs); | |
bd5635a1 | 1656 | |
072b552a JG |
1657 | /* Break the command line up into args. */ |
1658 | ||
1659 | argv = buildargv (args); | |
1660 | if (argv == NULL) | |
bd5635a1 | 1661 | { |
072b552a JG |
1662 | nomem (0); |
1663 | } | |
1664 | old_chain = make_cleanup (freeargv, (char *) argv); | |
bd5635a1 | 1665 | |
072b552a JG |
1666 | /* Walk through the args, looking for signal numbers, signal names, and |
1667 | actions. Signal numbers and signal names may be interspersed with | |
1668 | actions, with the actions being performed for all signals cumulatively | |
1669 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
bd5635a1 | 1670 | |
072b552a JG |
1671 | while (*argv != NULL) |
1672 | { | |
1673 | wordlen = strlen (*argv); | |
1674 | for (digits = 0; isdigit ((*argv)[digits]); digits++) {;} | |
1675 | allsigs = 0; | |
1676 | sigfirst = siglast = -1; | |
1677 | ||
1678 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
1679 | { | |
1680 | /* Apply action to all signals except those used by the | |
1681 | debugger. Silently skip those. */ | |
1682 | allsigs = 1; | |
1683 | sigfirst = 0; | |
1684 | siglast = nsigs - 1; | |
1685 | } | |
1686 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
1687 | { | |
1688 | SET_SIGS (nsigs, sigs, signal_stop); | |
1689 | SET_SIGS (nsigs, sigs, signal_print); | |
1690 | } | |
1691 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
1692 | { | |
1693 | UNSET_SIGS (nsigs, sigs, signal_program); | |
1694 | } | |
1695 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
1696 | { | |
1697 | SET_SIGS (nsigs, sigs, signal_print); | |
1698 | } | |
1699 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
1700 | { | |
1701 | SET_SIGS (nsigs, sigs, signal_program); | |
1702 | } | |
1703 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
1704 | { | |
1705 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
1706 | } | |
1707 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
1708 | { | |
1709 | SET_SIGS (nsigs, sigs, signal_program); | |
1710 | } | |
1711 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
1712 | { | |
1713 | UNSET_SIGS (nsigs, sigs, signal_print); | |
1714 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
1715 | } | |
1716 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
1717 | { | |
1718 | UNSET_SIGS (nsigs, sigs, signal_program); | |
1719 | } | |
1720 | else if (digits > 0) | |
bd5635a1 | 1721 | { |
072b552a JG |
1722 | sigfirst = siglast = atoi (*argv); |
1723 | if ((*argv)[digits] == '-') | |
bd5635a1 | 1724 | { |
072b552a | 1725 | siglast = atoi ((*argv) + digits + 1); |
bd5635a1 | 1726 | } |
072b552a | 1727 | if (sigfirst > siglast) |
bd5635a1 | 1728 | { |
072b552a JG |
1729 | /* Bet he didn't figure we'd think of this case... */ |
1730 | signum = sigfirst; | |
1731 | sigfirst = siglast; | |
1732 | siglast = signum; | |
bd5635a1 | 1733 | } |
072b552a JG |
1734 | if (sigfirst < 0 || sigfirst >= nsigs) |
1735 | { | |
1736 | error ("Signal %d not in range 0-%d", sigfirst, nsigs - 1); | |
1737 | } | |
1738 | if (siglast < 0 || siglast >= nsigs) | |
bd5635a1 | 1739 | { |
072b552a | 1740 | error ("Signal %d not in range 0-%d", siglast, nsigs - 1); |
bd5635a1 RP |
1741 | } |
1742 | } | |
072b552a | 1743 | else if ((signum = strtosigno (*argv)) != 0) |
bd5635a1 | 1744 | { |
072b552a | 1745 | sigfirst = siglast = signum; |
bd5635a1 | 1746 | } |
072b552a | 1747 | else |
bd5635a1 | 1748 | { |
072b552a JG |
1749 | /* Not a number and not a recognized flag word => complain. */ |
1750 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
bd5635a1 | 1751 | } |
072b552a JG |
1752 | |
1753 | /* If any signal numbers or symbol names were found, set flags for | |
1754 | which signals to apply actions to. */ | |
1755 | ||
1756 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
bd5635a1 | 1757 | { |
072b552a JG |
1758 | switch (signum) |
1759 | { | |
1760 | case SIGTRAP: | |
1761 | case SIGINT: | |
1762 | if (!allsigs && !sigs[signum]) | |
1763 | { | |
1764 | if (query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum))) | |
1765 | { | |
1766 | sigs[signum] = 1; | |
1767 | } | |
1768 | else | |
1769 | { | |
1770 | printf ("Not confirmed, unchanged.\n"); | |
1771 | fflush (stdout); | |
1772 | } | |
1773 | } | |
1774 | break; | |
1775 | default: | |
1776 | sigs[signum] = 1; | |
1777 | break; | |
1778 | } | |
bd5635a1 RP |
1779 | } |
1780 | ||
072b552a | 1781 | argv++; |
bd5635a1 RP |
1782 | } |
1783 | ||
cc221e76 FF |
1784 | NOTICE_SIGNAL_HANDLING_CHANGE; |
1785 | ||
bd5635a1 RP |
1786 | if (from_tty) |
1787 | { | |
1788 | /* Show the results. */ | |
1789 | sig_print_header (); | |
072b552a JG |
1790 | for (signum = 0; signum < nsigs; signum++) |
1791 | { | |
1792 | if (sigs[signum]) | |
1793 | { | |
1794 | sig_print_info (signum); | |
1795 | } | |
1796 | } | |
bd5635a1 | 1797 | } |
072b552a JG |
1798 | |
1799 | do_cleanups (old_chain); | |
bd5635a1 RP |
1800 | } |
1801 | ||
1802 | /* Print current contents of the tables set by the handle command. */ | |
1803 | ||
1804 | static void | |
e37a6e9c | 1805 | signals_info (signum_exp, from_tty) |
bd5635a1 | 1806 | char *signum_exp; |
e37a6e9c | 1807 | int from_tty; |
bd5635a1 RP |
1808 | { |
1809 | register int i; | |
1810 | sig_print_header (); | |
1811 | ||
1812 | if (signum_exp) | |
1813 | { | |
1814 | /* First see if this is a symbol name. */ | |
e37a6e9c PB |
1815 | i = strtosigno (signum_exp); |
1816 | if (i == 0) | |
bd5635a1 RP |
1817 | { |
1818 | /* Nope, maybe it's an address which evaluates to a signal | |
1819 | number. */ | |
1820 | i = parse_and_eval_address (signum_exp); | |
1821 | if (i >= NSIG || i < 0) | |
1822 | error ("Signal number out of bounds."); | |
1823 | } | |
1824 | sig_print_info (i); | |
1825 | return; | |
1826 | } | |
1827 | ||
1828 | printf_filtered ("\n"); | |
1829 | for (i = 0; i < NSIG; i++) | |
1830 | { | |
1831 | QUIT; | |
1832 | ||
1833 | sig_print_info (i); | |
1834 | } | |
1835 | ||
1836 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
1837 | } | |
1838 | \f | |
1839 | /* Save all of the information associated with the inferior<==>gdb | |
1840 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
1841 | (defined in inferior.h). */ | |
1842 | ||
1843 | void | |
1844 | save_inferior_status (inf_status, restore_stack_info) | |
1845 | struct inferior_status *inf_status; | |
1846 | int restore_stack_info; | |
1847 | { | |
1848 | inf_status->pc_changed = pc_changed; | |
1849 | inf_status->stop_signal = stop_signal; | |
1850 | inf_status->stop_pc = stop_pc; | |
1851 | inf_status->stop_frame_address = stop_frame_address; | |
1852 | inf_status->stop_step = stop_step; | |
1853 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
1854 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
1855 | inf_status->trap_expected = trap_expected; | |
1856 | inf_status->step_range_start = step_range_start; | |
1857 | inf_status->step_range_end = step_range_end; | |
1858 | inf_status->step_frame_address = step_frame_address; | |
1859 | inf_status->step_over_calls = step_over_calls; | |
1860 | inf_status->step_resume_break_address = step_resume_break_address; | |
1861 | inf_status->stop_after_trap = stop_after_trap; | |
1862 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
1863 | /* Save original bpstat chain here; replace it with copy of chain. | |
1864 | If caller's caller is walking the chain, they'll be happier if we | |
1865 | hand them back the original chain when restore_i_s is called. */ | |
1866 | inf_status->stop_bpstat = stop_bpstat; | |
1867 | stop_bpstat = bpstat_copy (stop_bpstat); | |
1868 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
1869 | inf_status->restore_stack_info = restore_stack_info; | |
1870 | inf_status->proceed_to_finish = proceed_to_finish; | |
1871 | ||
072b552a | 1872 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
bd5635a1 RP |
1873 | |
1874 | record_selected_frame (&(inf_status->selected_frame_address), | |
1875 | &(inf_status->selected_level)); | |
1876 | return; | |
1877 | } | |
1878 | ||
1879 | void | |
1880 | restore_inferior_status (inf_status) | |
1881 | struct inferior_status *inf_status; | |
1882 | { | |
1883 | FRAME fid; | |
1884 | int level = inf_status->selected_level; | |
1885 | ||
1886 | pc_changed = inf_status->pc_changed; | |
1887 | stop_signal = inf_status->stop_signal; | |
1888 | stop_pc = inf_status->stop_pc; | |
1889 | stop_frame_address = inf_status->stop_frame_address; | |
1890 | stop_step = inf_status->stop_step; | |
1891 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
1892 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
1893 | trap_expected = inf_status->trap_expected; | |
1894 | step_range_start = inf_status->step_range_start; | |
1895 | step_range_end = inf_status->step_range_end; | |
1896 | step_frame_address = inf_status->step_frame_address; | |
1897 | step_over_calls = inf_status->step_over_calls; | |
1898 | step_resume_break_address = inf_status->step_resume_break_address; | |
1899 | stop_after_trap = inf_status->stop_after_trap; | |
1900 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
1901 | bpstat_clear (&stop_bpstat); | |
1902 | stop_bpstat = inf_status->stop_bpstat; | |
1903 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
1904 | proceed_to_finish = inf_status->proceed_to_finish; | |
1905 | ||
072b552a | 1906 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
bd5635a1 RP |
1907 | |
1908 | /* The inferior can be gone if the user types "print exit(0)" | |
1909 | (and perhaps other times). */ | |
1910 | if (target_has_stack && inf_status->restore_stack_info) | |
1911 | { | |
1912 | fid = find_relative_frame (get_current_frame (), | |
1913 | &level); | |
1914 | ||
777bef06 JK |
1915 | /* If inf_status->selected_frame_address is NULL, there was no |
1916 | previously selected frame. */ | |
bd5635a1 RP |
1917 | if (fid == 0 || |
1918 | FRAME_FP (fid) != inf_status->selected_frame_address || | |
1919 | level != 0) | |
1920 | { | |
d747e0af | 1921 | #if 1 |
bd5635a1 RP |
1922 | /* I'm not sure this error message is a good idea. I have |
1923 | only seen it occur after "Can't continue previously | |
1924 | requested operation" (we get called from do_cleanups), in | |
1925 | which case it just adds insult to injury (one confusing | |
1926 | error message after another. Besides which, does the | |
1927 | user really care if we can't restore the previously | |
1928 | selected frame? */ | |
1929 | fprintf (stderr, "Unable to restore previously selected frame.\n"); | |
1930 | #endif | |
1931 | select_frame (get_current_frame (), 0); | |
1932 | return; | |
1933 | } | |
1934 | ||
1935 | select_frame (fid, inf_status->selected_level); | |
1936 | } | |
1937 | } | |
1938 | ||
1939 | \f | |
1940 | void | |
1941 | _initialize_infrun () | |
1942 | { | |
1943 | register int i; | |
e37a6e9c | 1944 | register int numsigs; |
bd5635a1 RP |
1945 | |
1946 | add_info ("signals", signals_info, | |
1947 | "What debugger does when program gets various signals.\n\ | |
1948 | Specify a signal number as argument to print info on that signal only."); | |
1949 | ||
1950 | add_com ("handle", class_run, handle_command, | |
1951 | "Specify how to handle a signal.\n\ | |
072b552a JG |
1952 | Args are signal numbers and actions to apply to those signals.\n\ |
1953 | Signal numbers may be numeric (ex. 11) or symbolic (ex. SIGSEGV).\n\ | |
1954 | Numeric ranges may be specified with the form LOW-HIGH (ex. 14-21).\n\ | |
1955 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1956 | used by the debugger, typically SIGTRAP and SIGINT.\n\ | |
1957 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
1958 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ | |
bd5635a1 | 1959 | Stop means reenter debugger if this signal happens (implies print).\n\ |
072b552a | 1960 | Print means print a message if this signal happens.\n\ |
bd5635a1 | 1961 | Pass means let program see this signal; otherwise program doesn't know.\n\ |
072b552a | 1962 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
bd5635a1 RP |
1963 | Pass and Stop may be combined."); |
1964 | ||
e37a6e9c | 1965 | numsigs = signo_max () + 1; |
072b552a JG |
1966 | signal_stop = (unsigned char *) |
1967 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
1968 | signal_print = (unsigned char *) | |
1969 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
1970 | signal_program = (unsigned char *) | |
1971 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
e37a6e9c | 1972 | for (i = 0; i < numsigs; i++) |
bd5635a1 RP |
1973 | { |
1974 | signal_stop[i] = 1; | |
1975 | signal_print[i] = 1; | |
1976 | signal_program[i] = 1; | |
1977 | } | |
1978 | ||
1979 | /* Signals caused by debugger's own actions | |
1980 | should not be given to the program afterwards. */ | |
1981 | signal_program[SIGTRAP] = 0; | |
1982 | signal_program[SIGINT] = 0; | |
1983 | ||
1984 | /* Signals that are not errors should not normally enter the debugger. */ | |
1985 | #ifdef SIGALRM | |
1986 | signal_stop[SIGALRM] = 0; | |
1987 | signal_print[SIGALRM] = 0; | |
1988 | #endif /* SIGALRM */ | |
1989 | #ifdef SIGVTALRM | |
1990 | signal_stop[SIGVTALRM] = 0; | |
1991 | signal_print[SIGVTALRM] = 0; | |
1992 | #endif /* SIGVTALRM */ | |
1993 | #ifdef SIGPROF | |
1994 | signal_stop[SIGPROF] = 0; | |
1995 | signal_print[SIGPROF] = 0; | |
1996 | #endif /* SIGPROF */ | |
1997 | #ifdef SIGCHLD | |
1998 | signal_stop[SIGCHLD] = 0; | |
1999 | signal_print[SIGCHLD] = 0; | |
2000 | #endif /* SIGCHLD */ | |
2001 | #ifdef SIGCLD | |
2002 | signal_stop[SIGCLD] = 0; | |
2003 | signal_print[SIGCLD] = 0; | |
2004 | #endif /* SIGCLD */ | |
2005 | #ifdef SIGIO | |
2006 | signal_stop[SIGIO] = 0; | |
2007 | signal_print[SIGIO] = 0; | |
2008 | #endif /* SIGIO */ | |
2009 | #ifdef SIGURG | |
2010 | signal_stop[SIGURG] = 0; | |
2011 | signal_print[SIGURG] = 0; | |
2012 | #endif /* SIGURG */ | |
2013 | } |