Commit | Line | Data |
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3aa6856a | 1 | /* Target-struct-independent code to start (run) and stop an inferior process. |
87273c71 | 2 | Copyright 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996 |
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 | 18 | along with this program; if not, write to the Free Software |
3f687c78 | 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
bd5635a1 | 20 | |
bd5635a1 | 21 | #include "defs.h" |
2b576293 | 22 | #include "gdb_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" |
1c95d7ab | 33 | #include "annotate.h" |
bd5635a1 RP |
34 | |
35 | #include <signal.h> | |
36 | ||
37 | /* unistd.h is needed to #define X_OK */ | |
38 | #ifdef USG | |
39 | #include <unistd.h> | |
40 | #else | |
41 | #include <sys/file.h> | |
42 | #endif | |
43 | ||
30875e1c | 44 | /* Prototypes for local functions */ |
bd5635a1 | 45 | |
4cc1b3f7 | 46 | static void signals_info PARAMS ((char *, int)); |
619fd145 | 47 | |
4cc1b3f7 | 48 | static void handle_command PARAMS ((char *, int)); |
30875e1c | 49 | |
67ac9759 | 50 | static void sig_print_info PARAMS ((enum target_signal)); |
30875e1c | 51 | |
4cc1b3f7 | 52 | static void sig_print_header PARAMS ((void)); |
30875e1c | 53 | |
4cc1b3f7 | 54 | static void resume_cleanups PARAMS ((int)); |
30875e1c | 55 | |
4cc1b3f7 | 56 | static int hook_stop_stub PARAMS ((char *)); |
3950a34e | 57 | |
30875e1c SG |
58 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
59 | program. It needs to examine the jmp_buf argument and extract the PC | |
60 | from it. The return value is non-zero on success, zero otherwise. */ | |
4cc1b3f7 | 61 | |
30875e1c SG |
62 | #ifndef GET_LONGJMP_TARGET |
63 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 | |
64 | #endif | |
65 | ||
d747e0af MT |
66 | |
67 | /* Some machines have trampoline code that sits between function callers | |
68 | and the actual functions themselves. If this machine doesn't have | |
69 | such things, disable their processing. */ | |
4cc1b3f7 | 70 | |
d747e0af MT |
71 | #ifndef SKIP_TRAMPOLINE_CODE |
72 | #define SKIP_TRAMPOLINE_CODE(pc) 0 | |
73 | #endif | |
74 | ||
87273c71 JL |
75 | /* Dynamic function trampolines are similar to solib trampolines in that they |
76 | are between the caller and the callee. The difference is that when you | |
77 | enter a dynamic trampoline, you can't determine the callee's address. Some | |
78 | (usually complex) code needs to run in the dynamic trampoline to figure out | |
79 | the callee's address. This macro is usually called twice. First, when we | |
80 | enter the trampoline (looks like a normal function call at that point). It | |
81 | should return the PC of a point within the trampoline where the callee's | |
82 | address is known. Second, when we hit the breakpoint, this routine returns | |
83 | the callee's address. At that point, things proceed as per a step resume | |
84 | breakpoint. */ | |
85 | ||
86 | #ifndef DYNAMIC_TRAMPOLINE_NEXTPC | |
87 | #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0 | |
88 | #endif | |
89 | ||
1eeba686 | 90 | /* For SVR4 shared libraries, each call goes through a small piece of |
4cc1b3f7 | 91 | trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates |
1eeba686 | 92 | to nonzero if we are current stopped in one of these. */ |
4cc1b3f7 JK |
93 | |
94 | #ifndef IN_SOLIB_CALL_TRAMPOLINE | |
95 | #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0 | |
96 | #endif | |
97 | ||
98 | /* In some shared library schemes, the return path from a shared library | |
99 | call may need to go through a trampoline too. */ | |
100 | ||
101 | #ifndef IN_SOLIB_RETURN_TRAMPOLINE | |
102 | #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0 | |
1eeba686 | 103 | #endif |
d747e0af | 104 | |
9f739abd SG |
105 | /* On some systems, the PC may be left pointing at an instruction that won't |
106 | actually be executed. This is usually indicated by a bit in the PSW. If | |
107 | we find ourselves in such a state, then we step the target beyond the | |
108 | nullified instruction before returning control to the user so as to avoid | |
109 | confusion. */ | |
110 | ||
111 | #ifndef INSTRUCTION_NULLIFIED | |
112 | #define INSTRUCTION_NULLIFIED 0 | |
113 | #endif | |
114 | ||
bd5635a1 RP |
115 | /* Tables of how to react to signals; the user sets them. */ |
116 | ||
072b552a JG |
117 | static unsigned char *signal_stop; |
118 | static unsigned char *signal_print; | |
119 | static unsigned char *signal_program; | |
120 | ||
121 | #define SET_SIGS(nsigs,sigs,flags) \ | |
122 | do { \ | |
123 | int signum = (nsigs); \ | |
124 | while (signum-- > 0) \ | |
125 | if ((sigs)[signum]) \ | |
126 | (flags)[signum] = 1; \ | |
127 | } while (0) | |
128 | ||
129 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
130 | do { \ | |
131 | int signum = (nsigs); \ | |
132 | while (signum-- > 0) \ | |
133 | if ((sigs)[signum]) \ | |
134 | (flags)[signum] = 0; \ | |
135 | } while (0) | |
bd5635a1 | 136 | |
3950a34e RP |
137 | |
138 | /* Command list pointer for the "stop" placeholder. */ | |
139 | ||
140 | static struct cmd_list_element *stop_command; | |
141 | ||
bd5635a1 | 142 | /* Nonzero if breakpoints are now inserted in the inferior. */ |
bd5635a1 | 143 | |
3950a34e | 144 | static int breakpoints_inserted; |
bd5635a1 RP |
145 | |
146 | /* Function inferior was in as of last step command. */ | |
147 | ||
148 | static struct symbol *step_start_function; | |
149 | ||
bd5635a1 RP |
150 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ |
151 | ||
152 | static int trap_expected; | |
153 | ||
87273c71 JL |
154 | /* Nonzero if we want to give control to the user when we're notified |
155 | of shared library events by the dynamic linker. */ | |
156 | static int stop_on_solib_events; | |
157 | ||
c66ed884 | 158 | #ifdef HP_OS_BUG |
bd5635a1 RP |
159 | /* Nonzero if the next time we try to continue the inferior, it will |
160 | step one instruction and generate a spurious trace trap. | |
161 | This is used to compensate for a bug in HP-UX. */ | |
162 | ||
163 | static int trap_expected_after_continue; | |
c66ed884 | 164 | #endif |
bd5635a1 RP |
165 | |
166 | /* Nonzero means expecting a trace trap | |
167 | and should stop the inferior and return silently when it happens. */ | |
168 | ||
169 | int stop_after_trap; | |
170 | ||
171 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
172 | It is used after attach, due to attaching to a process; | |
173 | when running in the shell before the child program has been exec'd; | |
174 | and when running some kinds of remote stuff (FIXME?). */ | |
175 | ||
176 | int stop_soon_quietly; | |
177 | ||
bd5635a1 RP |
178 | /* Nonzero if proceed is being used for a "finish" command or a similar |
179 | situation when stop_registers should be saved. */ | |
180 | ||
181 | int proceed_to_finish; | |
182 | ||
183 | /* Save register contents here when about to pop a stack dummy frame, | |
184 | if-and-only-if proceed_to_finish is set. | |
185 | Thus this contains the return value from the called function (assuming | |
186 | values are returned in a register). */ | |
187 | ||
188 | char stop_registers[REGISTER_BYTES]; | |
189 | ||
190 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
191 | ||
192 | static int breakpoints_failed; | |
193 | ||
194 | /* Nonzero after stop if current stack frame should be printed. */ | |
195 | ||
196 | static int stop_print_frame; | |
197 | ||
198 | #ifdef NO_SINGLE_STEP | |
199 | extern int one_stepped; /* From machine dependent code */ | |
200 | extern void single_step (); /* Same. */ | |
201 | #endif /* NO_SINGLE_STEP */ | |
202 | ||
894d8e69 JL |
203 | extern void write_pc_pid PARAMS ((CORE_ADDR, int)); |
204 | ||
a71d17b1 JK |
205 | \f |
206 | /* Things to clean up if we QUIT out of resume (). */ | |
e1ce8aa5 | 207 | /* ARGSUSED */ |
a71d17b1 JK |
208 | static void |
209 | resume_cleanups (arg) | |
210 | int arg; | |
211 | { | |
212 | normal_stop (); | |
213 | } | |
214 | ||
215 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
216 | wants to interrupt some lengthy single-stepping operation | |
217 | (for child processes, the SIGINT goes to the inferior, and so | |
218 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
219 | other targets, that's not true). | |
220 | ||
221 | STEP nonzero if we should step (zero to continue instead). | |
222 | SIG is the signal to give the inferior (zero for none). */ | |
310cc570 | 223 | void |
a71d17b1 JK |
224 | resume (step, sig) |
225 | int step; | |
67ac9759 | 226 | enum target_signal sig; |
a71d17b1 JK |
227 | { |
228 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
229 | QUIT; | |
d11c44f1 | 230 | |
cef4c2e7 PS |
231 | #ifdef CANNOT_STEP_BREAKPOINT |
232 | /* Most targets can step a breakpoint instruction, thus executing it | |
233 | normally. But if this one cannot, just continue and we will hit | |
234 | it anyway. */ | |
235 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
236 | step = 0; | |
237 | #endif | |
238 | ||
d11c44f1 JG |
239 | #ifdef NO_SINGLE_STEP |
240 | if (step) { | |
818de002 | 241 | single_step(sig); /* Do it the hard way, w/temp breakpoints */ |
d11c44f1 JG |
242 | step = 0; /* ...and don't ask hardware to do it. */ |
243 | } | |
244 | #endif | |
245 | ||
bdbd5f50 JG |
246 | /* Handle any optimized stores to the inferior NOW... */ |
247 | #ifdef DO_DEFERRED_STORES | |
248 | DO_DEFERRED_STORES; | |
249 | #endif | |
250 | ||
2f1c7c3f JK |
251 | /* Install inferior's terminal modes. */ |
252 | target_terminal_inferior (); | |
253 | ||
de43d7d0 | 254 | target_resume (-1, step, sig); |
a71d17b1 JK |
255 | discard_cleanups (old_cleanups); |
256 | } | |
257 | ||
bd5635a1 RP |
258 | \f |
259 | /* Clear out all variables saying what to do when inferior is continued. | |
260 | First do this, then set the ones you want, then call `proceed'. */ | |
261 | ||
262 | void | |
263 | clear_proceed_status () | |
264 | { | |
265 | trap_expected = 0; | |
266 | step_range_start = 0; | |
267 | step_range_end = 0; | |
268 | step_frame_address = 0; | |
269 | step_over_calls = -1; | |
bd5635a1 RP |
270 | stop_after_trap = 0; |
271 | stop_soon_quietly = 0; | |
272 | proceed_to_finish = 0; | |
273 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
274 | ||
275 | /* Discard any remaining commands or status from previous stop. */ | |
276 | bpstat_clear (&stop_bpstat); | |
277 | } | |
278 | ||
279 | /* Basic routine for continuing the program in various fashions. | |
280 | ||
281 | ADDR is the address to resume at, or -1 for resume where stopped. | |
282 | SIGGNAL is the signal to give it, or 0 for none, | |
283 | or -1 for act according to how it stopped. | |
284 | STEP is nonzero if should trap after one instruction. | |
285 | -1 means return after that and print nothing. | |
286 | You should probably set various step_... variables | |
287 | before calling here, if you are stepping. | |
288 | ||
289 | You should call clear_proceed_status before calling proceed. */ | |
290 | ||
291 | void | |
292 | proceed (addr, siggnal, step) | |
293 | CORE_ADDR addr; | |
67ac9759 | 294 | enum target_signal siggnal; |
bd5635a1 RP |
295 | int step; |
296 | { | |
297 | int oneproc = 0; | |
298 | ||
299 | if (step > 0) | |
300 | step_start_function = find_pc_function (read_pc ()); | |
301 | if (step < 0) | |
302 | stop_after_trap = 1; | |
303 | ||
bdbd5f50 | 304 | if (addr == (CORE_ADDR)-1) |
bd5635a1 RP |
305 | { |
306 | /* If there is a breakpoint at the address we will resume at, | |
307 | step one instruction before inserting breakpoints | |
308 | so that we do not stop right away. */ | |
309 | ||
37c99ddb | 310 | if (breakpoint_here_p (read_pc ())) |
bd5635a1 | 311 | oneproc = 1; |
b5aff268 JK |
312 | |
313 | #ifdef STEP_SKIPS_DELAY | |
314 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
315 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY | |
316 | is slow (it needs to read memory from the target). */ | |
317 | if (breakpoint_here_p (read_pc () + 4) | |
318 | && STEP_SKIPS_DELAY (read_pc ())) | |
319 | oneproc = 1; | |
320 | #endif /* STEP_SKIPS_DELAY */ | |
bd5635a1 RP |
321 | } |
322 | else | |
101b7f9c | 323 | write_pc (addr); |
bd5635a1 | 324 | |
320f93f7 SG |
325 | #ifdef PREPARE_TO_PROCEED |
326 | /* In a multi-threaded task we may select another thread and then continue. | |
327 | ||
328 | In this case the thread that stopped at a breakpoint will immediately | |
329 | cause another stop, if it is not stepped over first. On the other hand, | |
330 | if (ADDR != -1) we only want to single step over the breakpoint if we did | |
331 | switch to another thread. | |
332 | ||
333 | If we are single stepping, don't do any of the above. | |
334 | (Note that in the current implementation single stepping another | |
335 | thread after a breakpoint and then continuing will cause the original | |
336 | breakpoint to be hit again, but you can always continue, so it's not | |
337 | a big deal.) */ | |
338 | ||
479f0f18 | 339 | if (! step && PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ())) |
320f93f7 SG |
340 | oneproc = 1; |
341 | #endif /* PREPARE_TO_PROCEED */ | |
342 | ||
c66ed884 | 343 | #ifdef HP_OS_BUG |
bd5635a1 RP |
344 | if (trap_expected_after_continue) |
345 | { | |
346 | /* If (step == 0), a trap will be automatically generated after | |
347 | the first instruction is executed. Force step one | |
348 | instruction to clear this condition. This should not occur | |
349 | if step is nonzero, but it is harmless in that case. */ | |
350 | oneproc = 1; | |
351 | trap_expected_after_continue = 0; | |
352 | } | |
c66ed884 | 353 | #endif /* HP_OS_BUG */ |
bd5635a1 RP |
354 | |
355 | if (oneproc) | |
356 | /* We will get a trace trap after one instruction. | |
357 | Continue it automatically and insert breakpoints then. */ | |
358 | trap_expected = 1; | |
359 | else | |
360 | { | |
361 | int temp = insert_breakpoints (); | |
362 | if (temp) | |
363 | { | |
364 | print_sys_errmsg ("ptrace", temp); | |
365 | error ("Cannot insert breakpoints.\n\ | |
366 | The same program may be running in another process."); | |
367 | } | |
368 | breakpoints_inserted = 1; | |
369 | } | |
370 | ||
fcbc95a7 | 371 | if (siggnal != TARGET_SIGNAL_DEFAULT) |
bd5635a1 RP |
372 | stop_signal = siggnal; |
373 | /* If this signal should not be seen by program, | |
374 | give it zero. Used for debugging signals. */ | |
67ac9759 | 375 | else if (!signal_program[stop_signal]) |
fcbc95a7 | 376 | stop_signal = TARGET_SIGNAL_0; |
bd5635a1 | 377 | |
1c95d7ab JK |
378 | annotate_starting (); |
379 | ||
c66ed884 SG |
380 | /* Make sure that output from GDB appears before output from the |
381 | inferior. */ | |
382 | gdb_flush (gdb_stdout); | |
383 | ||
bd5635a1 | 384 | /* Resume inferior. */ |
a71d17b1 | 385 | resume (oneproc || step || bpstat_should_step (), stop_signal); |
bd5635a1 RP |
386 | |
387 | /* Wait for it to stop (if not standalone) | |
388 | and in any case decode why it stopped, and act accordingly. */ | |
389 | ||
390 | wait_for_inferior (); | |
391 | normal_stop (); | |
392 | } | |
393 | ||
bd5635a1 RP |
394 | /* Record the pc and sp of the program the last time it stopped. |
395 | These are just used internally by wait_for_inferior, but need | |
396 | to be preserved over calls to it and cleared when the inferior | |
397 | is started. */ | |
398 | static CORE_ADDR prev_pc; | |
bd5635a1 RP |
399 | static CORE_ADDR prev_func_start; |
400 | static char *prev_func_name; | |
401 | ||
a71d17b1 | 402 | \f |
bd5635a1 RP |
403 | /* Start remote-debugging of a machine over a serial link. */ |
404 | ||
405 | void | |
406 | start_remote () | |
407 | { | |
4cc1b3f7 | 408 | init_thread_list (); |
bd5635a1 RP |
409 | init_wait_for_inferior (); |
410 | clear_proceed_status (); | |
411 | stop_soon_quietly = 1; | |
412 | trap_expected = 0; | |
98885d76 JK |
413 | wait_for_inferior (); |
414 | normal_stop (); | |
bd5635a1 RP |
415 | } |
416 | ||
417 | /* Initialize static vars when a new inferior begins. */ | |
418 | ||
419 | void | |
420 | init_wait_for_inferior () | |
421 | { | |
422 | /* These are meaningless until the first time through wait_for_inferior. */ | |
423 | prev_pc = 0; | |
bd5635a1 RP |
424 | prev_func_start = 0; |
425 | prev_func_name = NULL; | |
426 | ||
c66ed884 | 427 | #ifdef HP_OS_BUG |
bd5635a1 | 428 | trap_expected_after_continue = 0; |
c66ed884 | 429 | #endif |
bd5635a1 | 430 | breakpoints_inserted = 0; |
cf3e377e | 431 | breakpoint_init_inferior (); |
67ac9759 JK |
432 | |
433 | /* Don't confuse first call to proceed(). */ | |
434 | stop_signal = TARGET_SIGNAL_0; | |
bd5635a1 RP |
435 | } |
436 | ||
fe675038 JK |
437 | static void |
438 | delete_breakpoint_current_contents (arg) | |
439 | PTR arg; | |
440 | { | |
441 | struct breakpoint **breakpointp = (struct breakpoint **)arg; | |
442 | if (*breakpointp != NULL) | |
443 | delete_breakpoint (*breakpointp); | |
444 | } | |
bd5635a1 RP |
445 | \f |
446 | /* Wait for control to return from inferior to debugger. | |
447 | If inferior gets a signal, we may decide to start it up again | |
448 | instead of returning. That is why there is a loop in this function. | |
449 | When this function actually returns it means the inferior | |
450 | should be left stopped and GDB should read more commands. */ | |
451 | ||
452 | void | |
453 | wait_for_inferior () | |
454 | { | |
fe675038 | 455 | struct cleanup *old_cleanups; |
67ac9759 | 456 | struct target_waitstatus w; |
bd5635a1 RP |
457 | int another_trap; |
458 | int random_signal; | |
bd5635a1 | 459 | CORE_ADDR stop_func_start; |
67ac9759 | 460 | CORE_ADDR stop_func_end; |
bd5635a1 | 461 | char *stop_func_name; |
894d8e69 JL |
462 | #if 0 |
463 | CORE_ADDR prologue_pc = 0; | |
464 | #endif | |
465 | CORE_ADDR tmp; | |
bd5635a1 RP |
466 | struct symtab_and_line sal; |
467 | int remove_breakpoints_on_following_step = 0; | |
b3b39c0c | 468 | int current_line; |
b2f03c30 | 469 | struct symtab *current_symtab; |
30875e1c | 470 | int handling_longjmp = 0; /* FIXME */ |
fe675038 | 471 | struct breakpoint *step_resume_breakpoint = NULL; |
bcc37718 | 472 | struct breakpoint *through_sigtramp_breakpoint = NULL; |
37c99ddb | 473 | int pid; |
479f0f18 | 474 | int update_step_sp = 0; |
bd5635a1 | 475 | |
fe675038 JK |
476 | old_cleanups = make_cleanup (delete_breakpoint_current_contents, |
477 | &step_resume_breakpoint); | |
bcc37718 JK |
478 | make_cleanup (delete_breakpoint_current_contents, |
479 | &through_sigtramp_breakpoint); | |
b3b39c0c SG |
480 | sal = find_pc_line(prev_pc, 0); |
481 | current_line = sal.line; | |
b2f03c30 | 482 | current_symtab = sal.symtab; |
b3b39c0c | 483 | |
cb6b0202 | 484 | /* Are we stepping? */ |
bcc37718 JK |
485 | #define CURRENTLY_STEPPING() \ |
486 | ((through_sigtramp_breakpoint == NULL \ | |
487 | && !handling_longjmp \ | |
488 | && ((step_range_end && step_resume_breakpoint == NULL) \ | |
489 | || trap_expected)) \ | |
490 | || bpstat_should_step ()) | |
cb6b0202 | 491 | |
bd5635a1 RP |
492 | while (1) |
493 | { | |
320f93f7 SG |
494 | /* We have to invalidate the registers BEFORE calling target_wait because |
495 | they can be loaded from the target while in target_wait. This makes | |
496 | remote debugging a bit more efficient for those targets that provide | |
497 | critical registers as part of their normal status mechanism. */ | |
498 | ||
499 | registers_changed (); | |
500 | ||
479f0f18 SG |
501 | if (target_wait_hook) |
502 | pid = target_wait_hook (-1, &w); | |
503 | else | |
504 | pid = target_wait (-1, &w); | |
1c95d7ab | 505 | |
894d8e69 JL |
506 | /* Gross. |
507 | ||
508 | We goto this label from elsewhere in wait_for_inferior when we want | |
509 | to continue the main loop without calling "wait" and trashing the | |
510 | waitstatus contained in W. */ | |
48f4903f JL |
511 | have_waited: |
512 | ||
bd5635a1 | 513 | flush_cached_frames (); |
320f93f7 SG |
514 | |
515 | /* If it's a new process, add it to the thread database */ | |
516 | ||
517 | if (pid != inferior_pid | |
518 | && !in_thread_list (pid)) | |
519 | { | |
520 | fprintf_unfiltered (gdb_stderr, "[New %s]\n", target_pid_to_str (pid)); | |
521 | add_thread (pid); | |
479f0f18 SG |
522 | |
523 | /* We may want to consider not doing a resume here in order to give | |
524 | the user a chance to play with the new thread. It might be good | |
525 | to make that a user-settable option. */ | |
526 | ||
527 | /* At this point, all threads are stopped (happens automatically in | |
528 | either the OS or the native code). Therefore we need to continue | |
529 | all threads in order to make progress. */ | |
530 | ||
531 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
532 | continue; | |
320f93f7 | 533 | } |
bd5635a1 | 534 | |
fcbc95a7 JK |
535 | switch (w.kind) |
536 | { | |
537 | case TARGET_WAITKIND_LOADED: | |
538 | /* Ignore it gracefully. */ | |
539 | if (breakpoints_inserted) | |
540 | { | |
541 | mark_breakpoints_out (); | |
542 | insert_breakpoints (); | |
543 | } | |
544 | resume (0, TARGET_SIGNAL_0); | |
545 | continue; | |
1eeba686 | 546 | |
fcbc95a7 JK |
547 | case TARGET_WAITKIND_SPURIOUS: |
548 | resume (0, TARGET_SIGNAL_0); | |
549 | continue; | |
1eeba686 | 550 | |
fcbc95a7 | 551 | case TARGET_WAITKIND_EXITED: |
bd5635a1 | 552 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1c95d7ab | 553 | annotate_exited (w.value.integer); |
67ac9759 | 554 | if (w.value.integer) |
e37a6e9c | 555 | printf_filtered ("\nProgram exited with code 0%o.\n", |
67ac9759 | 556 | (unsigned int)w.value.integer); |
bd5635a1 | 557 | else |
479f0f18 | 558 | printf_filtered ("\nProgram exited normally.\n"); |
2b576293 C |
559 | |
560 | /* Record the exit code in the convenience variable $_exitcode, so | |
561 | that the user can inspect this again later. */ | |
562 | set_internalvar (lookup_internalvar ("_exitcode"), | |
563 | value_from_longest (builtin_type_int, | |
564 | (LONGEST) w.value.integer)); | |
199b2450 | 565 | gdb_flush (gdb_stdout); |
bd5635a1 RP |
566 | target_mourn_inferior (); |
567 | #ifdef NO_SINGLE_STEP | |
568 | one_stepped = 0; | |
569 | #endif | |
570 | stop_print_frame = 0; | |
fcbc95a7 | 571 | goto stop_stepping; |
67ac9759 | 572 | |
fcbc95a7 | 573 | case TARGET_WAITKIND_SIGNALLED: |
bd5635a1 | 574 | stop_print_frame = 0; |
67ac9759 | 575 | stop_signal = w.value.sig; |
bd5635a1 | 576 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1c95d7ab | 577 | annotate_signalled (); |
4cc1b3f7 JK |
578 | |
579 | /* This looks pretty bogus to me. Doesn't TARGET_WAITKIND_SIGNALLED | |
580 | mean it is already dead? This has been here since GDB 2.8, so | |
581 | perhaps it means rms didn't understand unix waitstatuses? | |
582 | For the moment I'm just kludging around this in remote.c | |
583 | rather than trying to change it here --kingdon, 5 Dec 1994. */ | |
30875e1c | 584 | target_kill (); /* kill mourns as well */ |
4cc1b3f7 | 585 | |
1c95d7ab JK |
586 | printf_filtered ("\nProgram terminated with signal "); |
587 | annotate_signal_name (); | |
588 | printf_filtered ("%s", target_signal_to_name (stop_signal)); | |
589 | annotate_signal_name_end (); | |
590 | printf_filtered (", "); | |
591 | annotate_signal_string (); | |
592 | printf_filtered ("%s", target_signal_to_string (stop_signal)); | |
593 | annotate_signal_string_end (); | |
594 | printf_filtered (".\n"); | |
67ac9759 | 595 | |
fee44494 | 596 | printf_filtered ("The program no longer exists.\n"); |
199b2450 | 597 | gdb_flush (gdb_stdout); |
bd5635a1 RP |
598 | #ifdef NO_SINGLE_STEP |
599 | one_stepped = 0; | |
600 | #endif | |
fcbc95a7 JK |
601 | goto stop_stepping; |
602 | ||
603 | case TARGET_WAITKIND_STOPPED: | |
604 | /* This is the only case in which we keep going; the above cases | |
605 | end in a continue or goto. */ | |
bd5635a1 RP |
606 | break; |
607 | } | |
de43d7d0 | 608 | |
48f4903f JL |
609 | stop_signal = w.value.sig; |
610 | ||
611 | stop_pc = read_pc_pid (pid); | |
612 | ||
320f93f7 SG |
613 | /* See if a thread hit a thread-specific breakpoint that was meant for |
614 | another thread. If so, then step that thread past the breakpoint, | |
615 | and continue it. */ | |
de43d7d0 | 616 | |
67ac9759 | 617 | if (stop_signal == TARGET_SIGNAL_TRAP |
320f93f7 | 618 | && breakpoints_inserted |
de43d7d0 | 619 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) |
b2f03c30 | 620 | { |
320f93f7 | 621 | random_signal = 0; |
b2f03c30 JK |
622 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, pid)) |
623 | { | |
624 | /* Saw a breakpoint, but it was hit by the wrong thread. Just continue. */ | |
48f4903f | 625 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, pid); |
320f93f7 SG |
626 | |
627 | remove_breakpoints (); | |
628 | target_resume (pid, 1, TARGET_SIGNAL_0); /* Single step */ | |
629 | /* FIXME: What if a signal arrives instead of the single-step | |
630 | happening? */ | |
479f0f18 SG |
631 | |
632 | if (target_wait_hook) | |
633 | target_wait_hook (pid, &w); | |
634 | else | |
635 | target_wait (pid, &w); | |
320f93f7 | 636 | insert_breakpoints (); |
48f4903f JL |
637 | |
638 | /* We need to restart all the threads now. */ | |
639 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
b2f03c30 JK |
640 | continue; |
641 | } | |
b2f03c30 | 642 | } |
320f93f7 SG |
643 | else |
644 | random_signal = 1; | |
645 | ||
646 | /* See if something interesting happened to the non-current thread. If | |
647 | so, then switch to that thread, and eventually give control back to | |
648 | the user. */ | |
de43d7d0 | 649 | |
37c99ddb JK |
650 | if (pid != inferior_pid) |
651 | { | |
652 | int printed = 0; | |
653 | ||
320f93f7 SG |
654 | /* If it's a random signal for a non-current thread, notify user |
655 | if he's expressed an interest. */ | |
656 | ||
657 | if (random_signal | |
658 | && signal_print[stop_signal]) | |
659 | { | |
660 | printed = 1; | |
661 | target_terminal_ours_for_output (); | |
662 | printf_filtered ("\nProgram received signal %s, %s.\n", | |
663 | target_signal_to_name (stop_signal), | |
664 | target_signal_to_string (stop_signal)); | |
665 | gdb_flush (gdb_stdout); | |
666 | } | |
667 | ||
668 | /* If it's not SIGTRAP and not a signal we want to stop for, then | |
669 | continue the thread. */ | |
670 | ||
671 | if (stop_signal != TARGET_SIGNAL_TRAP | |
672 | && !signal_stop[stop_signal]) | |
37c99ddb | 673 | { |
320f93f7 SG |
674 | if (printed) |
675 | target_terminal_inferior (); | |
37c99ddb | 676 | |
320f93f7 SG |
677 | /* Clear the signal if it should not be passed. */ |
678 | if (signal_program[stop_signal] == 0) | |
679 | stop_signal = TARGET_SIGNAL_0; | |
680 | ||
681 | target_resume (pid, 0, stop_signal); | |
37c99ddb JK |
682 | continue; |
683 | } | |
320f93f7 SG |
684 | |
685 | /* It's a SIGTRAP or a signal we're interested in. Switch threads, | |
686 | and fall into the rest of wait_for_inferior(). */ | |
687 | ||
2b576293 C |
688 | /* Save infrun state for the old thread. */ |
689 | save_infrun_state (inferior_pid, prev_pc, | |
690 | prev_func_start, prev_func_name, | |
691 | trap_expected, step_resume_breakpoint, | |
692 | through_sigtramp_breakpoint, | |
693 | step_range_start, step_range_end, | |
694 | step_frame_address, handling_longjmp, | |
695 | another_trap); | |
696 | ||
320f93f7 | 697 | inferior_pid = pid; |
2b576293 C |
698 | |
699 | /* Load infrun state for the new thread. */ | |
700 | load_infrun_state (inferior_pid, &prev_pc, | |
701 | &prev_func_start, &prev_func_name, | |
702 | &trap_expected, &step_resume_breakpoint, | |
703 | &through_sigtramp_breakpoint, | |
704 | &step_range_start, &step_range_end, | |
705 | &step_frame_address, &handling_longjmp, | |
706 | &another_trap); | |
320f93f7 SG |
707 | printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid)); |
708 | ||
709 | flush_cached_frames (); | |
37c99ddb JK |
710 | } |
711 | ||
bd5635a1 RP |
712 | #ifdef NO_SINGLE_STEP |
713 | if (one_stepped) | |
714 | single_step (0); /* This actually cleans up the ss */ | |
715 | #endif /* NO_SINGLE_STEP */ | |
716 | ||
999dd04b JL |
717 | /* If PC is pointing at a nullified instruction, then step beyond |
718 | it so that the user won't be confused when GDB appears to be ready | |
719 | to execute it. */ | |
9f739abd SG |
720 | |
721 | if (INSTRUCTION_NULLIFIED) | |
722 | { | |
894d8e69 JL |
723 | struct target_waitstatus tmpstatus; |
724 | ||
7dbb5eed | 725 | registers_changed (); |
894d8e69 JL |
726 | target_resume (pid, 1, TARGET_SIGNAL_0); |
727 | ||
728 | /* We may have received a signal that we want to pass to | |
729 | the inferior; therefore, we must not clobber the waitstatus | |
730 | in W. So we call wait ourselves, then continue the loop | |
731 | at the "have_waited" label. */ | |
732 | if (target_wait_hook) | |
733 | target_wait_hook (pid, &tmpstatus); | |
734 | else | |
735 | target_wait (pid, &tmpstatus); | |
736 | ||
7dbb5eed | 737 | |
894d8e69 | 738 | goto have_waited; |
9f739abd SG |
739 | } |
740 | ||
48f4903f JL |
741 | #ifdef HAVE_STEPPABLE_WATCHPOINT |
742 | /* It may not be necessary to disable the watchpoint to stop over | |
743 | it. For example, the PA can (with some kernel cooperation) | |
744 | single step over a watchpoint without disabling the watchpoint. */ | |
745 | if (STOPPED_BY_WATCHPOINT (w)) | |
746 | { | |
747 | resume (1, 0); | |
748 | continue; | |
749 | } | |
750 | #endif | |
751 | ||
752 | #ifdef HAVE_NONSTEPPABLE_WATCHPOINT | |
753 | /* It is far more common to need to disable a watchpoint | |
754 | to step the inferior over it. FIXME. What else might | |
755 | a debug register or page protection watchpoint scheme need | |
756 | here? */ | |
757 | if (STOPPED_BY_WATCHPOINT (w)) | |
758 | { | |
759 | /* At this point, we are stopped at an instruction which has attempted to write | |
760 | to a piece of memory under control of a watchpoint. The instruction hasn't | |
761 | actually executed yet. If we were to evaluate the watchpoint expression | |
762 | now, we would get the old value, and therefore no change would seem to have | |
763 | occurred. | |
764 | ||
765 | In order to make watchpoints work `right', we really need to complete the | |
766 | memory write, and then evaluate the watchpoint expression. The following | |
767 | code does that by removing the watchpoint (actually, all watchpoints and | |
768 | breakpoints), single-stepping the target, re-inserting watchpoints, and then | |
769 | falling through to let normal single-step processing handle proceed. Since | |
770 | this includes evaluating watchpoints, things will come to a stop in the | |
771 | correct manner. */ | |
772 | ||
773 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
774 | ||
775 | remove_breakpoints (); | |
776 | target_resume (pid, 1, TARGET_SIGNAL_0); /* Single step */ | |
777 | ||
778 | if (target_wait_hook) | |
779 | target_wait_hook (pid, &w); | |
780 | else | |
781 | target_wait (pid, &w); | |
782 | insert_breakpoints (); | |
783 | /* FIXME-maybe: is this cleaner than setting a flag? Does it | |
784 | handle things like signals arriving and other things happening | |
785 | in combination correctly? */ | |
786 | goto have_waited; | |
787 | } | |
788 | #endif | |
789 | ||
790 | #ifdef HAVE_CONTINUABLE_WATCHPOINT | |
791 | /* It may be possible to simply continue after a watchpoint. */ | |
792 | STOPPED_BY_WATCHPOINT (w); | |
793 | #endif | |
794 | ||
bd5635a1 RP |
795 | stop_func_start = 0; |
796 | stop_func_name = 0; | |
797 | /* Don't care about return value; stop_func_start and stop_func_name | |
798 | will both be 0 if it doesn't work. */ | |
37c99ddb | 799 | find_pc_partial_function (stop_pc, &stop_func_name, &stop_func_start, |
67ac9759 | 800 | &stop_func_end); |
bd5635a1 RP |
801 | stop_func_start += FUNCTION_START_OFFSET; |
802 | another_trap = 0; | |
803 | bpstat_clear (&stop_bpstat); | |
804 | stop_step = 0; | |
805 | stop_stack_dummy = 0; | |
806 | stop_print_frame = 1; | |
bd5635a1 RP |
807 | random_signal = 0; |
808 | stopped_by_random_signal = 0; | |
809 | breakpoints_failed = 0; | |
810 | ||
811 | /* Look at the cause of the stop, and decide what to do. | |
812 | The alternatives are: | |
813 | 1) break; to really stop and return to the debugger, | |
814 | 2) drop through to start up again | |
815 | (set another_trap to 1 to single step once) | |
816 | 3) set random_signal to 1, and the decision between 1 and 2 | |
817 | will be made according to the signal handling tables. */ | |
818 | ||
bd5635a1 RP |
819 | /* First, distinguish signals caused by the debugger from signals |
820 | that have to do with the program's own actions. | |
821 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
822 | or SIGEMT, depending on the operating system version. | |
823 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
824 | and change it to SIGTRAP. */ | |
825 | ||
67ac9759 | 826 | if (stop_signal == TARGET_SIGNAL_TRAP |
bd5635a1 | 827 | || (breakpoints_inserted && |
67ac9759 JK |
828 | (stop_signal == TARGET_SIGNAL_ILL |
829 | || stop_signal == TARGET_SIGNAL_EMT | |
e37a6e9c | 830 | )) |
bd5635a1 RP |
831 | || stop_soon_quietly) |
832 | { | |
67ac9759 | 833 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) |
bd5635a1 RP |
834 | { |
835 | stop_print_frame = 0; | |
836 | break; | |
837 | } | |
838 | if (stop_soon_quietly) | |
839 | break; | |
840 | ||
841 | /* Don't even think about breakpoints | |
842 | if just proceeded over a breakpoint. | |
843 | ||
844 | However, if we are trying to proceed over a breakpoint | |
bcc37718 | 845 | and end up in sigtramp, then through_sigtramp_breakpoint |
bd5635a1 RP |
846 | will be set and we should check whether we've hit the |
847 | step breakpoint. */ | |
67ac9759 | 848 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected |
bcc37718 | 849 | && through_sigtramp_breakpoint == NULL) |
bd5635a1 RP |
850 | bpstat_clear (&stop_bpstat); |
851 | else | |
852 | { | |
853 | /* See if there is a breakpoint at the current PC. */ | |
cb6b0202 | 854 | stop_bpstat = bpstat_stop_status |
479f0f18 | 855 | (&stop_pc, |
bd5635a1 | 856 | #if DECR_PC_AFTER_BREAK |
cb6b0202 JK |
857 | /* Notice the case of stepping through a jump |
858 | that lands just after a breakpoint. | |
859 | Don't confuse that with hitting the breakpoint. | |
860 | What we check for is that 1) stepping is going on | |
861 | and 2) the pc before the last insn does not match | |
862 | the address of the breakpoint before the current pc. */ | |
863 | (prev_pc != stop_pc - DECR_PC_AFTER_BREAK | |
864 | && CURRENTLY_STEPPING ()) | |
865 | #else /* DECR_PC_AFTER_BREAK zero */ | |
866 | 0 | |
867 | #endif /* DECR_PC_AFTER_BREAK zero */ | |
868 | ); | |
869 | /* Following in case break condition called a | |
870 | function. */ | |
871 | stop_print_frame = 1; | |
bd5635a1 | 872 | } |
fe675038 | 873 | |
67ac9759 | 874 | if (stop_signal == TARGET_SIGNAL_TRAP) |
bd5635a1 RP |
875 | random_signal |
876 | = !(bpstat_explains_signal (stop_bpstat) | |
877 | || trap_expected | |
84d59861 | 878 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
479f0f18 SG |
879 | || PC_IN_CALL_DUMMY (stop_pc, read_sp (), |
880 | FRAME_FP (get_current_frame ())) | |
84d59861 | 881 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
fe675038 | 882 | || (step_range_end && step_resume_breakpoint == NULL)); |
bd5635a1 RP |
883 | else |
884 | { | |
885 | random_signal | |
886 | = !(bpstat_explains_signal (stop_bpstat) | |
bd5635a1 RP |
887 | /* End of a stack dummy. Some systems (e.g. Sony |
888 | news) give another signal besides SIGTRAP, | |
889 | so check here as well as above. */ | |
84d59861 | 890 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
479f0f18 SG |
891 | || PC_IN_CALL_DUMMY (stop_pc, read_sp (), |
892 | FRAME_FP (get_current_frame ())) | |
84d59861 | 893 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
bd5635a1 RP |
894 | ); |
895 | if (!random_signal) | |
67ac9759 | 896 | stop_signal = TARGET_SIGNAL_TRAP; |
bd5635a1 RP |
897 | } |
898 | } | |
899 | else | |
900 | random_signal = 1; | |
fe675038 | 901 | |
bd5635a1 RP |
902 | /* For the program's own signals, act according to |
903 | the signal handling tables. */ | |
fe675038 | 904 | |
bd5635a1 RP |
905 | if (random_signal) |
906 | { | |
907 | /* Signal not for debugging purposes. */ | |
908 | int printed = 0; | |
909 | ||
910 | stopped_by_random_signal = 1; | |
911 | ||
67ac9759 | 912 | if (signal_print[stop_signal]) |
bd5635a1 RP |
913 | { |
914 | printed = 1; | |
915 | target_terminal_ours_for_output (); | |
1c95d7ab JK |
916 | annotate_signal (); |
917 | printf_filtered ("\nProgram received signal "); | |
918 | annotate_signal_name (); | |
919 | printf_filtered ("%s", target_signal_to_name (stop_signal)); | |
920 | annotate_signal_name_end (); | |
921 | printf_filtered (", "); | |
922 | annotate_signal_string (); | |
923 | printf_filtered ("%s", target_signal_to_string (stop_signal)); | |
924 | annotate_signal_string_end (); | |
925 | printf_filtered (".\n"); | |
199b2450 | 926 | gdb_flush (gdb_stdout); |
bd5635a1 | 927 | } |
67ac9759 | 928 | if (signal_stop[stop_signal]) |
bd5635a1 RP |
929 | break; |
930 | /* If not going to stop, give terminal back | |
931 | if we took it away. */ | |
932 | else if (printed) | |
933 | target_terminal_inferior (); | |
b7f81b57 | 934 | |
101b7f9c PS |
935 | /* Clear the signal if it should not be passed. */ |
936 | if (signal_program[stop_signal] == 0) | |
67ac9759 | 937 | stop_signal = TARGET_SIGNAL_0; |
101b7f9c | 938 | |
fe675038 JK |
939 | /* I'm not sure whether this needs to be check_sigtramp2 or |
940 | whether it could/should be keep_going. */ | |
941 | goto check_sigtramp2; | |
bd5635a1 | 942 | } |
30875e1c | 943 | |
bd5635a1 | 944 | /* Handle cases caused by hitting a breakpoint. */ |
fe675038 JK |
945 | { |
946 | CORE_ADDR jmp_buf_pc; | |
29c6dce2 JK |
947 | struct bpstat_what what; |
948 | ||
949 | what = bpstat_what (stop_bpstat); | |
bd5635a1 | 950 | |
84d59861 JK |
951 | if (what.call_dummy) |
952 | { | |
953 | stop_stack_dummy = 1; | |
954 | #ifdef HP_OS_BUG | |
955 | trap_expected_after_continue = 1; | |
956 | #endif | |
957 | } | |
958 | ||
fe675038 JK |
959 | switch (what.main_action) |
960 | { | |
961 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
962 | /* If we hit the breakpoint at longjmp, disable it for the | |
963 | duration of this command. Then, install a temporary | |
964 | breakpoint at the target of the jmp_buf. */ | |
965 | disable_longjmp_breakpoint(); | |
966 | remove_breakpoints (); | |
967 | breakpoints_inserted = 0; | |
968 | if (!GET_LONGJMP_TARGET(&jmp_buf_pc)) goto keep_going; | |
969 | ||
970 | /* Need to blow away step-resume breakpoint, as it | |
971 | interferes with us */ | |
972 | if (step_resume_breakpoint != NULL) | |
973 | { | |
974 | delete_breakpoint (step_resume_breakpoint); | |
975 | step_resume_breakpoint = NULL; | |
bcc37718 JK |
976 | } |
977 | /* Not sure whether we need to blow this away too, but probably | |
978 | it is like the step-resume breakpoint. */ | |
979 | if (through_sigtramp_breakpoint != NULL) | |
980 | { | |
981 | delete_breakpoint (through_sigtramp_breakpoint); | |
982 | through_sigtramp_breakpoint = NULL; | |
fe675038 | 983 | } |
30875e1c | 984 | |
101b7f9c | 985 | #if 0 |
fe675038 JK |
986 | /* FIXME - Need to implement nested temporary breakpoints */ |
987 | if (step_over_calls > 0) | |
988 | set_longjmp_resume_breakpoint(jmp_buf_pc, | |
989 | get_current_frame()); | |
990 | else | |
30875e1c | 991 | #endif /* 0 */ |
fe675038 JK |
992 | set_longjmp_resume_breakpoint(jmp_buf_pc, NULL); |
993 | handling_longjmp = 1; /* FIXME */ | |
994 | goto keep_going; | |
995 | ||
996 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: | |
997 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
998 | remove_breakpoints (); | |
999 | breakpoints_inserted = 0; | |
101b7f9c | 1000 | #if 0 |
fe675038 JK |
1001 | /* FIXME - Need to implement nested temporary breakpoints */ |
1002 | if (step_over_calls | |
479f0f18 | 1003 | && (FRAME_FP (get_current_frame ()) |
fe675038 JK |
1004 | INNER_THAN step_frame_address)) |
1005 | { | |
1006 | another_trap = 1; | |
1007 | goto keep_going; | |
1008 | } | |
30875e1c | 1009 | #endif /* 0 */ |
fe675038 JK |
1010 | disable_longjmp_breakpoint(); |
1011 | handling_longjmp = 0; /* FIXME */ | |
1012 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
101b7f9c | 1013 | break; |
fe675038 JK |
1014 | /* else fallthrough */ |
1015 | ||
1016 | case BPSTAT_WHAT_SINGLE: | |
1017 | if (breakpoints_inserted) | |
1018 | remove_breakpoints (); | |
1019 | breakpoints_inserted = 0; | |
1020 | another_trap = 1; | |
1021 | /* Still need to check other stuff, at least the case | |
1022 | where we are stepping and step out of the right range. */ | |
1023 | break; | |
1024 | ||
1025 | case BPSTAT_WHAT_STOP_NOISY: | |
1026 | stop_print_frame = 1; | |
bcc37718 JK |
1027 | |
1028 | /* We are about to nuke the step_resume_breakpoint and | |
1029 | through_sigtramp_breakpoint via the cleanup chain, so | |
1030 | no need to worry about it here. */ | |
1031 | ||
fe675038 | 1032 | goto stop_stepping; |
101b7f9c | 1033 | |
fe675038 JK |
1034 | case BPSTAT_WHAT_STOP_SILENT: |
1035 | stop_print_frame = 0; | |
fe675038 | 1036 | |
bcc37718 JK |
1037 | /* We are about to nuke the step_resume_breakpoint and |
1038 | through_sigtramp_breakpoint via the cleanup chain, so | |
1039 | no need to worry about it here. */ | |
100f92e2 | 1040 | |
bcc37718 | 1041 | goto stop_stepping; |
fe675038 | 1042 | |
bcc37718 | 1043 | case BPSTAT_WHAT_STEP_RESUME: |
fe675038 JK |
1044 | delete_breakpoint (step_resume_breakpoint); |
1045 | step_resume_breakpoint = NULL; | |
bcc37718 JK |
1046 | break; |
1047 | ||
1048 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
479f0f18 SG |
1049 | if (through_sigtramp_breakpoint) |
1050 | delete_breakpoint (through_sigtramp_breakpoint); | |
bcc37718 | 1051 | through_sigtramp_breakpoint = NULL; |
30875e1c | 1052 | |
fe675038 JK |
1053 | /* If were waiting for a trap, hitting the step_resume_break |
1054 | doesn't count as getting it. */ | |
1055 | if (trap_expected) | |
1056 | another_trap = 1; | |
bcc37718 JK |
1057 | break; |
1058 | ||
87273c71 JL |
1059 | #ifdef SOLIB_ADD |
1060 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
1061 | { | |
1062 | extern int auto_solib_add; | |
1063 | ||
fa3764e2 JL |
1064 | /* Remove breakpoints, we eventually want to step over the |
1065 | shlib event breakpoint, and SOLIB_ADD might adjust | |
1066 | breakpoint addresses via breakpoint_re_set. */ | |
1067 | if (breakpoints_inserted) | |
1068 | remove_breakpoints (); | |
1069 | breakpoints_inserted = 0; | |
1070 | ||
87273c71 JL |
1071 | /* Check for any newly added shared libraries if we're |
1072 | supposed to be adding them automatically. */ | |
1073 | if (auto_solib_add) | |
11be829f | 1074 | { |
11be829f JL |
1075 | /* Switch terminal for any messages produced by |
1076 | breakpoint_re_set. */ | |
1077 | target_terminal_ours_for_output (); | |
1078 | SOLIB_ADD (NULL, 0, NULL); | |
fa3764e2 | 1079 | re_enable_breakpoints_in_shlibs (); |
11be829f JL |
1080 | target_terminal_inferior (); |
1081 | } | |
87273c71 JL |
1082 | |
1083 | /* If requested, stop when the dynamic linker notifies | |
1084 | gdb of events. This allows the user to get control | |
1085 | and place breakpoints in initializer routines for | |
1086 | dynamically loaded objects (among other things). */ | |
1087 | if (stop_on_solib_events) | |
1088 | { | |
1089 | stop_print_frame = 0; | |
1090 | goto stop_stepping; | |
1091 | } | |
1092 | else | |
1093 | { | |
1094 | /* We want to step over this breakpoint, then keep going. */ | |
1095 | another_trap = 1; | |
87273c71 JL |
1096 | break; |
1097 | } | |
1098 | } | |
1099 | #endif | |
1100 | ||
bcc37718 JK |
1101 | case BPSTAT_WHAT_LAST: |
1102 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
1103 | ||
1104 | case BPSTAT_WHAT_KEEP_CHECKING: | |
1105 | break; | |
30875e1c | 1106 | } |
fe675038 | 1107 | } |
30875e1c SG |
1108 | |
1109 | /* We come here if we hit a breakpoint but should not | |
1110 | stop for it. Possibly we also were stepping | |
1111 | and should stop for that. So fall through and | |
1112 | test for stepping. But, if not stepping, | |
1113 | do not stop. */ | |
1114 | ||
84d59861 JK |
1115 | #ifndef CALL_DUMMY_BREAKPOINT_OFFSET |
1116 | /* This is the old way of detecting the end of the stack dummy. | |
1117 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
1118 | handled above. As soon as we can test it on all of them, all | |
1119 | architectures should define it. */ | |
1120 | ||
bd5635a1 | 1121 | /* If this is the breakpoint at the end of a stack dummy, |
c9de302b SG |
1122 | just stop silently, unless the user was doing an si/ni, in which |
1123 | case she'd better know what she's doing. */ | |
1124 | ||
479f0f18 | 1125 | if (PC_IN_CALL_DUMMY (stop_pc, read_sp (), FRAME_FP (get_current_frame ())) |
c9de302b SG |
1126 | && !step_range_end) |
1127 | { | |
1128 | stop_print_frame = 0; | |
1129 | stop_stack_dummy = 1; | |
bd5635a1 | 1130 | #ifdef HP_OS_BUG |
c9de302b | 1131 | trap_expected_after_continue = 1; |
bd5635a1 | 1132 | #endif |
c9de302b SG |
1133 | break; |
1134 | } | |
84d59861 JK |
1135 | #endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ |
1136 | ||
fe675038 | 1137 | if (step_resume_breakpoint) |
bd5635a1 RP |
1138 | /* Having a step-resume breakpoint overrides anything |
1139 | else having to do with stepping commands until | |
1140 | that breakpoint is reached. */ | |
bcc37718 JK |
1141 | /* I'm not sure whether this needs to be check_sigtramp2 or |
1142 | whether it could/should be keep_going. */ | |
fe675038 JK |
1143 | goto check_sigtramp2; |
1144 | ||
1145 | if (step_range_end == 0) | |
1146 | /* Likewise if we aren't even stepping. */ | |
1147 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
1148 | whether it could/should be keep_going. */ | |
1149 | goto check_sigtramp2; | |
1150 | ||
bd5635a1 | 1151 | /* If stepping through a line, keep going if still within it. */ |
fe675038 JK |
1152 | if (stop_pc >= step_range_start |
1153 | && stop_pc < step_range_end | |
3f687c78 SG |
1154 | #if 0 |
1155 | /* I haven't a clue what might trigger this clause, and it seems wrong anyway, | |
1156 | so I've disabled it until someone complains. -Stu 10/24/95 */ | |
1157 | ||
fe675038 JK |
1158 | /* The step range might include the start of the |
1159 | function, so if we are at the start of the | |
1160 | step range and either the stack or frame pointers | |
1161 | just changed, we've stepped outside */ | |
1162 | && !(stop_pc == step_range_start | |
479f0f18 SG |
1163 | && FRAME_FP (get_current_frame ()) |
1164 | && (read_sp () INNER_THAN step_sp | |
3f687c78 SG |
1165 | || FRAME_FP (get_current_frame ()) != step_frame_address)) |
1166 | #endif | |
1167 | ) | |
bd5635a1 | 1168 | { |
fe675038 JK |
1169 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. |
1170 | So definately need to check for sigtramp here. */ | |
1171 | goto check_sigtramp2; | |
bd5635a1 | 1172 | } |
fe675038 | 1173 | |
479f0f18 SG |
1174 | /* We stepped out of the stepping range. */ |
1175 | ||
1176 | /* We can't update step_sp every time through the loop, because | |
1177 | reading the stack pointer would slow down stepping too much. | |
1178 | But we can update it every time we leave the step range. */ | |
1179 | update_step_sp = 1; | |
fe675038 JK |
1180 | |
1181 | /* Did we just take a signal? */ | |
1182 | if (IN_SIGTRAMP (stop_pc, stop_func_name) | |
1183 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) | |
bd5635a1 | 1184 | { |
bcc37718 JK |
1185 | /* We've just taken a signal; go until we are back to |
1186 | the point where we took it and one more. */ | |
1187 | ||
fe675038 JK |
1188 | /* This code is needed at least in the following case: |
1189 | The user types "next" and then a signal arrives (before | |
1190 | the "next" is done). */ | |
bcc37718 JK |
1191 | |
1192 | /* Note that if we are stopped at a breakpoint, then we need | |
1193 | the step_resume breakpoint to override any breakpoints at | |
1194 | the same location, so that we will still step over the | |
1195 | breakpoint even though the signal happened. */ | |
1196 | ||
fe675038 JK |
1197 | { |
1198 | struct symtab_and_line sr_sal; | |
1199 | ||
1200 | sr_sal.pc = prev_pc; | |
1201 | sr_sal.symtab = NULL; | |
1202 | sr_sal.line = 0; | |
d1c0c6cf | 1203 | /* We could probably be setting the frame to |
479f0f18 | 1204 | step_frame_address; I don't think anyone thought to try it. */ |
fe675038 | 1205 | step_resume_breakpoint = |
bcc37718 | 1206 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); |
fe675038 JK |
1207 | if (breakpoints_inserted) |
1208 | insert_breakpoints (); | |
1209 | } | |
bd5635a1 | 1210 | |
fe675038 JK |
1211 | /* If this is stepi or nexti, make sure that the stepping range |
1212 | gets us past that instruction. */ | |
1213 | if (step_range_end == 1) | |
1214 | /* FIXME: Does this run afoul of the code below which, if | |
1215 | we step into the middle of a line, resets the stepping | |
1216 | range? */ | |
1217 | step_range_end = (step_range_start = prev_pc) + 1; | |
101b7f9c | 1218 | |
fe675038 JK |
1219 | remove_breakpoints_on_following_step = 1; |
1220 | goto keep_going; | |
1221 | } | |
30875e1c | 1222 | |
3f687c78 SG |
1223 | #if 0 |
1224 | /* I disabled this test because it was too complicated and slow. The | |
1225 | SKIP_PROLOGUE was especially slow, because it caused unnecessary | |
1226 | prologue examination on various architectures. The code in the #else | |
1227 | clause has been tested on the Sparc, Mips, PA, and Power | |
1228 | architectures, so it's pretty likely to be correct. -Stu 10/24/95 */ | |
1229 | ||
479f0f18 SG |
1230 | /* See if we left the step range due to a subroutine call that |
1231 | we should proceed to the end of. */ | |
1232 | ||
fe675038 JK |
1233 | if (stop_func_start) |
1234 | { | |
320f93f7 SG |
1235 | struct symtab *s; |
1236 | ||
fe675038 JK |
1237 | /* Do this after the IN_SIGTRAMP check; it might give |
1238 | an error. */ | |
1239 | prologue_pc = stop_func_start; | |
320f93f7 SG |
1240 | |
1241 | /* Don't skip the prologue if this is assembly source */ | |
1242 | s = find_pc_symtab (stop_pc); | |
1243 | if (s && s->language != language_asm) | |
1244 | SKIP_PROLOGUE (prologue_pc); | |
fe675038 | 1245 | } |
30875e1c | 1246 | |
c0c14c1e JK |
1247 | if ((/* Might be a non-recursive call. If the symbols are missing |
1248 | enough that stop_func_start == prev_func_start even though | |
1249 | they are really two functions, we will treat some calls as | |
1250 | jumps. */ | |
1251 | stop_func_start != prev_func_start | |
1252 | ||
1253 | /* Might be a recursive call if either we have a prologue | |
1254 | or the call instruction itself saves the PC on the stack. */ | |
1255 | || prologue_pc != stop_func_start | |
479f0f18 | 1256 | || read_sp () != step_sp) |
199b2450 TL |
1257 | && (/* PC is completely out of bounds of any known objfiles. Treat |
1258 | like a subroutine call. */ | |
1259 | ! stop_func_start | |
c0c14c1e | 1260 | |
f1619234 | 1261 | /* If we do a call, we will be at the start of a function... */ |
c0c14c1e | 1262 | || stop_pc == stop_func_start |
f1619234 JK |
1263 | |
1264 | /* ...except on the Alpha with -O (and also Irix 5 and | |
1265 | perhaps others), in which we might call the address | |
1266 | after the load of gp. Since prologues don't contain | |
1267 | calls, we can't return to within one, and we don't | |
1268 | jump back into them, so this check is OK. */ | |
c0c14c1e | 1269 | |
c0c14c1e | 1270 | || stop_pc < prologue_pc |
d747e0af | 1271 | |
479f0f18 SG |
1272 | /* ...and if it is a leaf function, the prologue might |
1273 | consist of gp loading only, so the call transfers to | |
1274 | the first instruction after the prologue. */ | |
1275 | || (stop_pc == prologue_pc | |
1276 | ||
1277 | /* Distinguish this from the case where we jump back | |
1278 | to the first instruction after the prologue, | |
1279 | within a function. */ | |
1280 | && stop_func_start != prev_func_start) | |
1281 | ||
c0c14c1e JK |
1282 | /* If we end up in certain places, it means we did a subroutine |
1283 | call. I'm not completely sure this is necessary now that we | |
1284 | have the above checks with stop_func_start (and now that | |
100f92e2 | 1285 | find_pc_partial_function is pickier). */ |
4cc1b3f7 | 1286 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, stop_func_name) |
c0c14c1e JK |
1287 | |
1288 | /* If none of the above apply, it is a jump within a function, | |
1289 | or a return from a subroutine. The other case is longjmp, | |
1290 | which can no longer happen here as long as the | |
1291 | handling_longjmp stuff is working. */ | |
1292 | )) | |
320f93f7 | 1293 | #else |
87273c71 JL |
1294 | /* This test is a much more streamlined, (but hopefully correct) |
1295 | replacement for the code above. It's been tested on the Sparc, | |
1296 | Mips, PA, and Power architectures with good results. */ | |
320f93f7 | 1297 | |
3f687c78 SG |
1298 | if (stop_pc == stop_func_start /* Quick test */ |
1299 | || in_prologue (stop_pc, stop_func_start) | |
1300 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, stop_func_name) | |
1301 | || stop_func_start == 0) | |
320f93f7 | 1302 | #endif |
3f687c78 | 1303 | |
fe675038 JK |
1304 | { |
1305 | /* It's a subroutine call. */ | |
fee44494 | 1306 | |
fe675038 JK |
1307 | if (step_over_calls == 0) |
1308 | { | |
1309 | /* I presume that step_over_calls is only 0 when we're | |
1310 | supposed to be stepping at the assembly language level | |
1311 | ("stepi"). Just stop. */ | |
1312 | stop_step = 1; | |
1313 | break; | |
1314 | } | |
fee44494 | 1315 | |
fe675038 JK |
1316 | if (step_over_calls > 0) |
1317 | /* We're doing a "next". */ | |
1318 | goto step_over_function; | |
1319 | ||
1320 | /* If we are in a function call trampoline (a stub between | |
1321 | the calling routine and the real function), locate the real | |
1322 | function. That's what tells us (a) whether we want to step | |
1323 | into it at all, and (b) what prologue we want to run to | |
1324 | the end of, if we do step into it. */ | |
1325 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
1326 | if (tmp != 0) | |
1327 | stop_func_start = tmp; | |
87273c71 JL |
1328 | else |
1329 | { | |
1330 | tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); | |
1331 | if (tmp) | |
1332 | { | |
1333 | struct symtab_and_line xxx; | |
1334 | ||
1335 | xxx.pc = tmp; | |
1336 | xxx.symtab = NULL; | |
1337 | xxx.line = 0; | |
1338 | step_resume_breakpoint = | |
1339 | set_momentary_breakpoint (xxx, NULL, bp_step_resume); | |
1340 | insert_breakpoints (); | |
1341 | goto keep_going; | |
1342 | } | |
1343 | } | |
fe675038 JK |
1344 | |
1345 | /* If we have line number information for the function we | |
1346 | are thinking of stepping into, step into it. | |
1347 | ||
1348 | If there are several symtabs at that PC (e.g. with include | |
1349 | files), just want to know whether *any* of them have line | |
1350 | numbers. find_pc_line handles this. */ | |
1351 | { | |
1352 | struct symtab_and_line tmp_sal; | |
1353 | ||
1354 | tmp_sal = find_pc_line (stop_func_start, 0); | |
1355 | if (tmp_sal.line != 0) | |
1356 | goto step_into_function; | |
1357 | } | |
d747e0af MT |
1358 | |
1359 | step_over_function: | |
fe675038 JK |
1360 | /* A subroutine call has happened. */ |
1361 | { | |
1362 | /* Set a special breakpoint after the return */ | |
1363 | struct symtab_and_line sr_sal; | |
1364 | sr_sal.pc = | |
1365 | ADDR_BITS_REMOVE | |
1366 | (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
1367 | sr_sal.symtab = NULL; | |
1368 | sr_sal.line = 0; | |
1369 | step_resume_breakpoint = | |
1370 | set_momentary_breakpoint (sr_sal, get_current_frame (), | |
1371 | bp_step_resume); | |
479f0f18 | 1372 | step_resume_breakpoint->frame = step_frame_address; |
fe675038 JK |
1373 | if (breakpoints_inserted) |
1374 | insert_breakpoints (); | |
1375 | } | |
1376 | goto keep_going; | |
d747e0af MT |
1377 | |
1378 | step_into_function: | |
fe675038 JK |
1379 | /* Subroutine call with source code we should not step over. |
1380 | Do step to the first line of code in it. */ | |
320f93f7 SG |
1381 | { |
1382 | struct symtab *s; | |
1383 | ||
1384 | s = find_pc_symtab (stop_pc); | |
1385 | if (s && s->language != language_asm) | |
1386 | SKIP_PROLOGUE (stop_func_start); | |
1387 | } | |
fe675038 JK |
1388 | sal = find_pc_line (stop_func_start, 0); |
1389 | /* Use the step_resume_break to step until | |
1390 | the end of the prologue, even if that involves jumps | |
1391 | (as it seems to on the vax under 4.2). */ | |
1392 | /* If the prologue ends in the middle of a source line, | |
67ac9759 JK |
1393 | continue to the end of that source line (if it is still |
1394 | within the function). Otherwise, just go to end of prologue. */ | |
bd5635a1 | 1395 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP |
fe675038 JK |
1396 | /* no, don't either. It skips any code that's |
1397 | legitimately on the first line. */ | |
bd5635a1 | 1398 | #else |
67ac9759 | 1399 | if (sal.end && sal.pc != stop_func_start && sal.end < stop_func_end) |
fe675038 | 1400 | stop_func_start = sal.end; |
bd5635a1 | 1401 | #endif |
d747e0af | 1402 | |
fe675038 JK |
1403 | if (stop_func_start == stop_pc) |
1404 | { | |
1405 | /* We are already there: stop now. */ | |
1406 | stop_step = 1; | |
1407 | break; | |
1408 | } | |
1409 | else | |
1410 | /* Put the step-breakpoint there and go until there. */ | |
1411 | { | |
1412 | struct symtab_and_line sr_sal; | |
1413 | ||
1414 | sr_sal.pc = stop_func_start; | |
1415 | sr_sal.symtab = NULL; | |
1416 | sr_sal.line = 0; | |
1417 | /* Do not specify what the fp should be when we stop | |
1418 | since on some machines the prologue | |
1419 | is where the new fp value is established. */ | |
1420 | step_resume_breakpoint = | |
84d59861 | 1421 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); |
fe675038 JK |
1422 | if (breakpoints_inserted) |
1423 | insert_breakpoints (); | |
1424 | ||
1425 | /* And make sure stepping stops right away then. */ | |
1426 | step_range_end = step_range_start; | |
bd5635a1 | 1427 | } |
fe675038 JK |
1428 | goto keep_going; |
1429 | } | |
d747e0af | 1430 | |
b2f03c30 | 1431 | /* We've wandered out of the step range. */ |
d747e0af | 1432 | |
fe675038 JK |
1433 | sal = find_pc_line(stop_pc, 0); |
1434 | ||
1435 | if (step_range_end == 1) | |
1436 | { | |
1437 | /* It is stepi or nexti. We always want to stop stepping after | |
1438 | one instruction. */ | |
1439 | stop_step = 1; | |
1440 | break; | |
1441 | } | |
1442 | ||
4cc1b3f7 JK |
1443 | /* If we're in the return path from a shared library trampoline, |
1444 | we want to proceed through the trampoline when stepping. */ | |
1445 | if (IN_SOLIB_RETURN_TRAMPOLINE(stop_pc, stop_func_name)) | |
1446 | { | |
1447 | CORE_ADDR tmp; | |
1448 | ||
1449 | /* Determine where this trampoline returns. */ | |
1450 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
1451 | ||
1452 | /* Only proceed through if we know where it's going. */ | |
1453 | if (tmp) | |
1454 | { | |
1455 | /* And put the step-breakpoint there and go until there. */ | |
1456 | struct symtab_and_line sr_sal; | |
1457 | ||
1458 | sr_sal.pc = tmp; | |
1459 | sr_sal.symtab = NULL; | |
1460 | sr_sal.line = 0; | |
1461 | /* Do not specify what the fp should be when we stop | |
1462 | since on some machines the prologue | |
1463 | is where the new fp value is established. */ | |
1464 | step_resume_breakpoint = | |
1465 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
1466 | if (breakpoints_inserted) | |
1467 | insert_breakpoints (); | |
1468 | ||
1469 | /* Restart without fiddling with the step ranges or | |
1470 | other state. */ | |
1471 | goto keep_going; | |
1472 | } | |
1473 | } | |
1474 | ||
fe675038 JK |
1475 | if (sal.line == 0) |
1476 | { | |
1477 | /* We have no line number information. That means to stop | |
1478 | stepping (does this always happen right after one instruction, | |
1479 | when we do "s" in a function with no line numbers, | |
1480 | or can this happen as a result of a return or longjmp?). */ | |
1481 | stop_step = 1; | |
1482 | break; | |
1483 | } | |
1484 | ||
b2f03c30 JK |
1485 | if (stop_pc == sal.pc |
1486 | && (current_line != sal.line || current_symtab != sal.symtab)) | |
fe675038 JK |
1487 | { |
1488 | /* We are at the start of a different line. So stop. Note that | |
1489 | we don't stop if we step into the middle of a different line. | |
1490 | That is said to make things like for (;;) statements work | |
1491 | better. */ | |
1492 | stop_step = 1; | |
1493 | break; | |
bd5635a1 RP |
1494 | } |
1495 | ||
fe675038 JK |
1496 | /* We aren't done stepping. |
1497 | ||
1498 | Optimize by setting the stepping range to the line. | |
1499 | (We might not be in the original line, but if we entered a | |
1500 | new line in mid-statement, we continue stepping. This makes | |
1501 | things like for(;;) statements work better.) */ | |
67ac9759 JK |
1502 | |
1503 | if (stop_func_end && sal.end >= stop_func_end) | |
1504 | { | |
1505 | /* If this is the last line of the function, don't keep stepping | |
1506 | (it would probably step us out of the function). | |
1507 | This is particularly necessary for a one-line function, | |
1508 | in which after skipping the prologue we better stop even though | |
1509 | we will be in mid-line. */ | |
1510 | stop_step = 1; | |
1511 | break; | |
1512 | } | |
fe675038 JK |
1513 | step_range_start = sal.pc; |
1514 | step_range_end = sal.end; | |
1515 | goto keep_going; | |
1516 | ||
1517 | check_sigtramp2: | |
d747e0af MT |
1518 | if (trap_expected |
1519 | && IN_SIGTRAMP (stop_pc, stop_func_name) | |
1520 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) | |
bd5635a1 RP |
1521 | { |
1522 | /* What has happened here is that we have just stepped the inferior | |
1523 | with a signal (because it is a signal which shouldn't make | |
1524 | us stop), thus stepping into sigtramp. | |
1525 | ||
1526 | So we need to set a step_resume_break_address breakpoint | |
fe675038 JK |
1527 | and continue until we hit it, and then step. FIXME: This should |
1528 | be more enduring than a step_resume breakpoint; we should know | |
1529 | that we will later need to keep going rather than re-hitting | |
1530 | the breakpoint here (see testsuite/gdb.t06/signals.exp where | |
1531 | it says "exceedingly difficult"). */ | |
1532 | struct symtab_and_line sr_sal; | |
1533 | ||
1534 | sr_sal.pc = prev_pc; | |
1535 | sr_sal.symtab = NULL; | |
1536 | sr_sal.line = 0; | |
bcc37718 JK |
1537 | /* We perhaps could set the frame if we kept track of what |
1538 | the frame corresponding to prev_pc was. But we don't, | |
1539 | so don't. */ | |
1540 | through_sigtramp_breakpoint = | |
1541 | set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp); | |
bd5635a1 | 1542 | if (breakpoints_inserted) |
fe675038 JK |
1543 | insert_breakpoints (); |
1544 | ||
bd5635a1 RP |
1545 | remove_breakpoints_on_following_step = 1; |
1546 | another_trap = 1; | |
1547 | } | |
1548 | ||
30875e1c | 1549 | keep_going: |
fe675038 JK |
1550 | /* Come to this label when you need to resume the inferior. |
1551 | It's really much cleaner to do a goto than a maze of if-else | |
1552 | conditions. */ | |
30875e1c | 1553 | |
bd5635a1 RP |
1554 | /* Save the pc before execution, to compare with pc after stop. */ |
1555 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
1556 | prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER | |
1557 | BREAK is defined, the | |
1558 | original pc would not have | |
1559 | been at the start of a | |
1560 | function. */ | |
1561 | prev_func_name = stop_func_name; | |
479f0f18 SG |
1562 | |
1563 | if (update_step_sp) | |
1564 | step_sp = read_sp (); | |
1565 | update_step_sp = 0; | |
bd5635a1 RP |
1566 | |
1567 | /* If we did not do break;, it means we should keep | |
1568 | running the inferior and not return to debugger. */ | |
1569 | ||
67ac9759 | 1570 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) |
bd5635a1 RP |
1571 | { |
1572 | /* We took a signal (which we are supposed to pass through to | |
1573 | the inferior, else we'd have done a break above) and we | |
1574 | haven't yet gotten our trap. Simply continue. */ | |
cb6b0202 | 1575 | resume (CURRENTLY_STEPPING (), stop_signal); |
bd5635a1 RP |
1576 | } |
1577 | else | |
1578 | { | |
1579 | /* Either the trap was not expected, but we are continuing | |
1580 | anyway (the user asked that this signal be passed to the | |
1581 | child) | |
1582 | -- or -- | |
1583 | The signal was SIGTRAP, e.g. it was our signal, but we | |
1584 | decided we should resume from it. | |
1585 | ||
1586 | We're going to run this baby now! | |
1587 | ||
1588 | Insert breakpoints now, unless we are trying | |
1589 | to one-proceed past a breakpoint. */ | |
1590 | /* If we've just finished a special step resume and we don't | |
1591 | want to hit a breakpoint, pull em out. */ | |
d1c0c6cf JK |
1592 | if (step_resume_breakpoint == NULL |
1593 | && through_sigtramp_breakpoint == NULL | |
1594 | && remove_breakpoints_on_following_step) | |
bd5635a1 RP |
1595 | { |
1596 | remove_breakpoints_on_following_step = 0; | |
1597 | remove_breakpoints (); | |
1598 | breakpoints_inserted = 0; | |
1599 | } | |
1600 | else if (!breakpoints_inserted && | |
bcc37718 | 1601 | (through_sigtramp_breakpoint != NULL || !another_trap)) |
bd5635a1 | 1602 | { |
bd5635a1 RP |
1603 | breakpoints_failed = insert_breakpoints (); |
1604 | if (breakpoints_failed) | |
1605 | break; | |
1606 | breakpoints_inserted = 1; | |
1607 | } | |
1608 | ||
1609 | trap_expected = another_trap; | |
1610 | ||
67ac9759 JK |
1611 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1612 | stop_signal = TARGET_SIGNAL_0; | |
bd5635a1 RP |
1613 | |
1614 | #ifdef SHIFT_INST_REGS | |
1615 | /* I'm not sure when this following segment applies. I do know, now, | |
1616 | that we shouldn't rewrite the regs when we were stopped by a | |
1617 | random signal from the inferior process. */ | |
cef4c2e7 PS |
1618 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? |
1619 | (this is only used on the 88k). */ | |
bd5635a1 | 1620 | |
d11c44f1 | 1621 | if (!bpstat_explains_signal (stop_bpstat) |
67ac9759 | 1622 | && (stop_signal != TARGET_SIGNAL_CHLD) |
bd5635a1 | 1623 | && !stopped_by_random_signal) |
07a5991a | 1624 | SHIFT_INST_REGS(); |
bd5635a1 RP |
1625 | #endif /* SHIFT_INST_REGS */ |
1626 | ||
cb6b0202 | 1627 | resume (CURRENTLY_STEPPING (), stop_signal); |
bd5635a1 RP |
1628 | } |
1629 | } | |
30875e1c SG |
1630 | |
1631 | stop_stepping: | |
bd5635a1 RP |
1632 | if (target_has_execution) |
1633 | { | |
1634 | /* Assuming the inferior still exists, set these up for next | |
1635 | time, just like we did above if we didn't break out of the | |
1636 | loop. */ | |
1637 | prev_pc = read_pc (); | |
1638 | prev_func_start = stop_func_start; | |
1639 | prev_func_name = stop_func_name; | |
bd5635a1 | 1640 | } |
fe675038 | 1641 | do_cleanups (old_cleanups); |
bd5635a1 RP |
1642 | } |
1643 | \f | |
1644 | /* Here to return control to GDB when the inferior stops for real. | |
1645 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
1646 | ||
1647 | STOP_PRINT_FRAME nonzero means print the executing frame | |
1648 | (pc, function, args, file, line number and line text). | |
1649 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
1650 | attempting to insert breakpoints. */ | |
1651 | ||
1652 | void | |
1653 | normal_stop () | |
1654 | { | |
1655 | /* Make sure that the current_frame's pc is correct. This | |
1656 | is a correction for setting up the frame info before doing | |
1657 | DECR_PC_AFTER_BREAK */ | |
3f0184ac | 1658 | if (target_has_execution && get_current_frame()) |
bd5635a1 RP |
1659 | (get_current_frame ())->pc = read_pc (); |
1660 | ||
1661 | if (breakpoints_failed) | |
1662 | { | |
1663 | target_terminal_ours_for_output (); | |
1664 | print_sys_errmsg ("ptrace", breakpoints_failed); | |
e37a6e9c | 1665 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
bd5635a1 RP |
1666 | The same program may be running in another process.\n"); |
1667 | } | |
1668 | ||
bd5635a1 RP |
1669 | if (target_has_execution && breakpoints_inserted) |
1670 | if (remove_breakpoints ()) | |
1671 | { | |
1672 | target_terminal_ours_for_output (); | |
e37a6e9c | 1673 | printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\ |
bd5635a1 RP |
1674 | It might be running in another process.\n\ |
1675 | Further execution is probably impossible.\n"); | |
1676 | } | |
1677 | ||
1678 | breakpoints_inserted = 0; | |
1679 | ||
1680 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
1681 | Delete any breakpoint that is to be deleted at the next stop. */ | |
1682 | ||
1683 | breakpoint_auto_delete (stop_bpstat); | |
1684 | ||
1685 | /* If an auto-display called a function and that got a signal, | |
1686 | delete that auto-display to avoid an infinite recursion. */ | |
1687 | ||
1688 | if (stopped_by_random_signal) | |
1689 | disable_current_display (); | |
1690 | ||
1691 | if (step_multi && stop_step) | |
1c95d7ab | 1692 | goto done; |
bd5635a1 RP |
1693 | |
1694 | target_terminal_ours (); | |
1695 | ||
11be829f JL |
1696 | if (stop_bpstat |
1697 | && stop_bpstat->breakpoint_at | |
1698 | && stop_bpstat->breakpoint_at->type == bp_shlib_event) | |
87273c71 JL |
1699 | printf_filtered ("Stopped due to shared library event\n"); |
1700 | ||
3950a34e RP |
1701 | /* Look up the hook_stop and run it if it exists. */ |
1702 | ||
1703 | if (stop_command->hook) | |
1704 | { | |
1705 | catch_errors (hook_stop_stub, (char *)stop_command->hook, | |
fee44494 | 1706 | "Error while running hook_stop:\n", RETURN_MASK_ALL); |
3950a34e RP |
1707 | } |
1708 | ||
bd5635a1 | 1709 | if (!target_has_stack) |
1c95d7ab | 1710 | goto done; |
bd5635a1 RP |
1711 | |
1712 | /* Select innermost stack frame except on return from a stack dummy routine, | |
1515ff18 JG |
1713 | or if the program has exited. Print it without a level number if |
1714 | we have changed functions or hit a breakpoint. Print source line | |
1715 | if we have one. */ | |
bd5635a1 RP |
1716 | if (!stop_stack_dummy) |
1717 | { | |
479f0f18 SG |
1718 | select_frame (get_current_frame (), 0); |
1719 | ||
bd5635a1 RP |
1720 | if (stop_print_frame) |
1721 | { | |
1515ff18 JG |
1722 | int source_only; |
1723 | ||
1724 | source_only = bpstat_print (stop_bpstat); | |
1725 | source_only = source_only || | |
1726 | ( stop_step | |
479f0f18 | 1727 | && step_frame_address == FRAME_FP (get_current_frame ()) |
1515ff18 JG |
1728 | && step_start_function == find_pc_function (stop_pc)); |
1729 | ||
1730 | print_stack_frame (selected_frame, -1, source_only? -1: 1); | |
bd5635a1 RP |
1731 | |
1732 | /* Display the auto-display expressions. */ | |
1733 | do_displays (); | |
1734 | } | |
1735 | } | |
1736 | ||
1737 | /* Save the function value return registers, if we care. | |
1738 | We might be about to restore their previous contents. */ | |
1739 | if (proceed_to_finish) | |
1740 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
1741 | ||
1742 | if (stop_stack_dummy) | |
1743 | { | |
1744 | /* Pop the empty frame that contains the stack dummy. | |
1745 | POP_FRAME ends with a setting of the current frame, so we | |
1746 | can use that next. */ | |
1747 | POP_FRAME; | |
f1de67d3 PS |
1748 | /* Set stop_pc to what it was before we called the function. Can't rely |
1749 | on restore_inferior_status because that only gets called if we don't | |
1750 | stop in the called function. */ | |
1751 | stop_pc = read_pc(); | |
bd5635a1 RP |
1752 | select_frame (get_current_frame (), 0); |
1753 | } | |
1c95d7ab JK |
1754 | done: |
1755 | annotate_stopped (); | |
bd5635a1 | 1756 | } |
3950a34e RP |
1757 | |
1758 | static int | |
1759 | hook_stop_stub (cmd) | |
1760 | char *cmd; | |
1761 | { | |
1762 | execute_user_command ((struct cmd_list_element *)cmd, 0); | |
a8a69e63 | 1763 | return (0); |
3950a34e | 1764 | } |
bd5635a1 | 1765 | \f |
cc221e76 FF |
1766 | int signal_stop_state (signo) |
1767 | int signo; | |
1768 | { | |
67ac9759 | 1769 | return signal_stop[signo]; |
cc221e76 FF |
1770 | } |
1771 | ||
1772 | int signal_print_state (signo) | |
1773 | int signo; | |
1774 | { | |
67ac9759 | 1775 | return signal_print[signo]; |
cc221e76 FF |
1776 | } |
1777 | ||
1778 | int signal_pass_state (signo) | |
1779 | int signo; | |
1780 | { | |
67ac9759 | 1781 | return signal_program[signo]; |
cc221e76 FF |
1782 | } |
1783 | ||
bd5635a1 RP |
1784 | static void |
1785 | sig_print_header () | |
1786 | { | |
67ac9759 JK |
1787 | printf_filtered ("\ |
1788 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
bd5635a1 RP |
1789 | } |
1790 | ||
1791 | static void | |
67ac9759 JK |
1792 | sig_print_info (oursig) |
1793 | enum target_signal oursig; | |
bd5635a1 | 1794 | { |
67ac9759 JK |
1795 | char *name = target_signal_to_name (oursig); |
1796 | printf_filtered ("%s", name); | |
1797 | printf_filtered ("%*.*s ", 13 - strlen (name), 13 - strlen (name), | |
1798 | " "); | |
1799 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
1800 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
1801 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
1802 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
bd5635a1 RP |
1803 | } |
1804 | ||
1805 | /* Specify how various signals in the inferior should be handled. */ | |
1806 | ||
1807 | static void | |
1808 | handle_command (args, from_tty) | |
1809 | char *args; | |
1810 | int from_tty; | |
1811 | { | |
072b552a JG |
1812 | char **argv; |
1813 | int digits, wordlen; | |
1814 | int sigfirst, signum, siglast; | |
67ac9759 | 1815 | enum target_signal oursig; |
072b552a JG |
1816 | int allsigs; |
1817 | int nsigs; | |
1818 | unsigned char *sigs; | |
1819 | struct cleanup *old_chain; | |
1820 | ||
1821 | if (args == NULL) | |
1822 | { | |
1823 | error_no_arg ("signal to handle"); | |
1824 | } | |
bd5635a1 | 1825 | |
072b552a JG |
1826 | /* Allocate and zero an array of flags for which signals to handle. */ |
1827 | ||
67ac9759 | 1828 | nsigs = (int)TARGET_SIGNAL_LAST; |
072b552a JG |
1829 | sigs = (unsigned char *) alloca (nsigs); |
1830 | memset (sigs, 0, nsigs); | |
bd5635a1 | 1831 | |
072b552a JG |
1832 | /* Break the command line up into args. */ |
1833 | ||
1834 | argv = buildargv (args); | |
1835 | if (argv == NULL) | |
bd5635a1 | 1836 | { |
072b552a JG |
1837 | nomem (0); |
1838 | } | |
1839 | old_chain = make_cleanup (freeargv, (char *) argv); | |
bd5635a1 | 1840 | |
67ac9759 | 1841 | /* Walk through the args, looking for signal oursigs, signal names, and |
072b552a JG |
1842 | actions. Signal numbers and signal names may be interspersed with |
1843 | actions, with the actions being performed for all signals cumulatively | |
1844 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
bd5635a1 | 1845 | |
072b552a JG |
1846 | while (*argv != NULL) |
1847 | { | |
1848 | wordlen = strlen (*argv); | |
1849 | for (digits = 0; isdigit ((*argv)[digits]); digits++) {;} | |
1850 | allsigs = 0; | |
1851 | sigfirst = siglast = -1; | |
1852 | ||
1853 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
1854 | { | |
1855 | /* Apply action to all signals except those used by the | |
1856 | debugger. Silently skip those. */ | |
1857 | allsigs = 1; | |
1858 | sigfirst = 0; | |
1859 | siglast = nsigs - 1; | |
1860 | } | |
1861 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
1862 | { | |
1863 | SET_SIGS (nsigs, sigs, signal_stop); | |
1864 | SET_SIGS (nsigs, sigs, signal_print); | |
1865 | } | |
1866 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
1867 | { | |
1868 | UNSET_SIGS (nsigs, sigs, signal_program); | |
1869 | } | |
1870 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
1871 | { | |
1872 | SET_SIGS (nsigs, sigs, signal_print); | |
1873 | } | |
1874 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
1875 | { | |
1876 | SET_SIGS (nsigs, sigs, signal_program); | |
1877 | } | |
1878 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
1879 | { | |
1880 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
1881 | } | |
1882 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
1883 | { | |
1884 | SET_SIGS (nsigs, sigs, signal_program); | |
1885 | } | |
1886 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
1887 | { | |
1888 | UNSET_SIGS (nsigs, sigs, signal_print); | |
1889 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
1890 | } | |
1891 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
1892 | { | |
1893 | UNSET_SIGS (nsigs, sigs, signal_program); | |
1894 | } | |
1895 | else if (digits > 0) | |
bd5635a1 | 1896 | { |
67ac9759 JK |
1897 | /* It is numeric. The numeric signal refers to our own internal |
1898 | signal numbering from target.h, not to host/target signal number. | |
1899 | This is a feature; users really should be using symbolic names | |
1900 | anyway, and the common ones like SIGHUP, SIGINT, SIGALRM, etc. | |
1901 | will work right anyway. */ | |
1902 | ||
c66ed884 | 1903 | sigfirst = siglast = (int) target_signal_from_command (atoi (*argv)); |
072b552a | 1904 | if ((*argv)[digits] == '-') |
bd5635a1 | 1905 | { |
c66ed884 SG |
1906 | siglast = |
1907 | (int) target_signal_from_command (atoi ((*argv) + digits + 1)); | |
bd5635a1 | 1908 | } |
072b552a | 1909 | if (sigfirst > siglast) |
bd5635a1 | 1910 | { |
072b552a JG |
1911 | /* Bet he didn't figure we'd think of this case... */ |
1912 | signum = sigfirst; | |
1913 | sigfirst = siglast; | |
1914 | siglast = signum; | |
bd5635a1 | 1915 | } |
bd5635a1 | 1916 | } |
072b552a | 1917 | else |
bd5635a1 | 1918 | { |
fcbc95a7 JK |
1919 | oursig = target_signal_from_name (*argv); |
1920 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
1921 | { | |
1922 | sigfirst = siglast = (int)oursig; | |
1923 | } | |
1924 | else | |
1925 | { | |
1926 | /* Not a number and not a recognized flag word => complain. */ | |
1927 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
1928 | } | |
bd5635a1 | 1929 | } |
072b552a JG |
1930 | |
1931 | /* If any signal numbers or symbol names were found, set flags for | |
1932 | which signals to apply actions to. */ | |
1933 | ||
1934 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
bd5635a1 | 1935 | { |
67ac9759 | 1936 | switch ((enum target_signal)signum) |
072b552a | 1937 | { |
67ac9759 JK |
1938 | case TARGET_SIGNAL_TRAP: |
1939 | case TARGET_SIGNAL_INT: | |
072b552a JG |
1940 | if (!allsigs && !sigs[signum]) |
1941 | { | |
67ac9759 JK |
1942 | if (query ("%s is used by the debugger.\n\ |
1943 | Are you sure you want to change it? ", | |
1944 | target_signal_to_name | |
1945 | ((enum target_signal)signum))) | |
072b552a JG |
1946 | { |
1947 | sigs[signum] = 1; | |
1948 | } | |
1949 | else | |
1950 | { | |
199b2450 TL |
1951 | printf_unfiltered ("Not confirmed, unchanged.\n"); |
1952 | gdb_flush (gdb_stdout); | |
072b552a JG |
1953 | } |
1954 | } | |
1955 | break; | |
c66ed884 SG |
1956 | case TARGET_SIGNAL_0: |
1957 | case TARGET_SIGNAL_DEFAULT: | |
1958 | case TARGET_SIGNAL_UNKNOWN: | |
1959 | /* Make sure that "all" doesn't print these. */ | |
1960 | break; | |
072b552a JG |
1961 | default: |
1962 | sigs[signum] = 1; | |
1963 | break; | |
1964 | } | |
bd5635a1 RP |
1965 | } |
1966 | ||
072b552a | 1967 | argv++; |
bd5635a1 RP |
1968 | } |
1969 | ||
de43d7d0 | 1970 | target_notice_signals(inferior_pid); |
cc221e76 | 1971 | |
bd5635a1 RP |
1972 | if (from_tty) |
1973 | { | |
1974 | /* Show the results. */ | |
1975 | sig_print_header (); | |
072b552a JG |
1976 | for (signum = 0; signum < nsigs; signum++) |
1977 | { | |
1978 | if (sigs[signum]) | |
1979 | { | |
1980 | sig_print_info (signum); | |
1981 | } | |
1982 | } | |
bd5635a1 | 1983 | } |
072b552a JG |
1984 | |
1985 | do_cleanups (old_chain); | |
bd5635a1 RP |
1986 | } |
1987 | ||
67ac9759 JK |
1988 | /* Print current contents of the tables set by the handle command. |
1989 | It is possible we should just be printing signals actually used | |
1990 | by the current target (but for things to work right when switching | |
1991 | targets, all signals should be in the signal tables). */ | |
bd5635a1 RP |
1992 | |
1993 | static void | |
e37a6e9c | 1994 | signals_info (signum_exp, from_tty) |
bd5635a1 | 1995 | char *signum_exp; |
e37a6e9c | 1996 | int from_tty; |
bd5635a1 | 1997 | { |
67ac9759 | 1998 | enum target_signal oursig; |
bd5635a1 RP |
1999 | sig_print_header (); |
2000 | ||
2001 | if (signum_exp) | |
2002 | { | |
2003 | /* First see if this is a symbol name. */ | |
67ac9759 JK |
2004 | oursig = target_signal_from_name (signum_exp); |
2005 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
bd5635a1 | 2006 | { |
c66ed884 SG |
2007 | /* No, try numeric. */ |
2008 | oursig = | |
2009 | target_signal_from_command (parse_and_eval_address (signum_exp)); | |
bd5635a1 | 2010 | } |
67ac9759 | 2011 | sig_print_info (oursig); |
bd5635a1 RP |
2012 | return; |
2013 | } | |
2014 | ||
2015 | printf_filtered ("\n"); | |
db4340a6 | 2016 | /* These ugly casts brought to you by the native VAX compiler. */ |
2fe3b329 | 2017 | for (oursig = TARGET_SIGNAL_FIRST; |
db4340a6 JK |
2018 | (int)oursig < (int)TARGET_SIGNAL_LAST; |
2019 | oursig = (enum target_signal)((int)oursig + 1)) | |
bd5635a1 RP |
2020 | { |
2021 | QUIT; | |
2022 | ||
fcbc95a7 JK |
2023 | if (oursig != TARGET_SIGNAL_UNKNOWN |
2024 | && oursig != TARGET_SIGNAL_DEFAULT | |
2025 | && oursig != TARGET_SIGNAL_0) | |
67ac9759 | 2026 | sig_print_info (oursig); |
bd5635a1 RP |
2027 | } |
2028 | ||
2029 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
2030 | } | |
2031 | \f | |
2032 | /* Save all of the information associated with the inferior<==>gdb | |
2033 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
2034 | (defined in inferior.h). */ | |
2035 | ||
2036 | void | |
2037 | save_inferior_status (inf_status, restore_stack_info) | |
2038 | struct inferior_status *inf_status; | |
2039 | int restore_stack_info; | |
2040 | { | |
bd5635a1 RP |
2041 | inf_status->stop_signal = stop_signal; |
2042 | inf_status->stop_pc = stop_pc; | |
bd5635a1 RP |
2043 | inf_status->stop_step = stop_step; |
2044 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
2045 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
2046 | inf_status->trap_expected = trap_expected; | |
2047 | inf_status->step_range_start = step_range_start; | |
2048 | inf_status->step_range_end = step_range_end; | |
2049 | inf_status->step_frame_address = step_frame_address; | |
2050 | inf_status->step_over_calls = step_over_calls; | |
bd5635a1 RP |
2051 | inf_status->stop_after_trap = stop_after_trap; |
2052 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
2053 | /* Save original bpstat chain here; replace it with copy of chain. | |
2054 | If caller's caller is walking the chain, they'll be happier if we | |
2055 | hand them back the original chain when restore_i_s is called. */ | |
2056 | inf_status->stop_bpstat = stop_bpstat; | |
2057 | stop_bpstat = bpstat_copy (stop_bpstat); | |
2058 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
2059 | inf_status->restore_stack_info = restore_stack_info; | |
2060 | inf_status->proceed_to_finish = proceed_to_finish; | |
2061 | ||
072b552a | 2062 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
37c99ddb JK |
2063 | |
2064 | read_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
2065 | ||
bd5635a1 RP |
2066 | record_selected_frame (&(inf_status->selected_frame_address), |
2067 | &(inf_status->selected_level)); | |
2068 | return; | |
2069 | } | |
2070 | ||
37c99ddb | 2071 | struct restore_selected_frame_args { |
4cc1b3f7 | 2072 | CORE_ADDR frame_address; |
37c99ddb JK |
2073 | int level; |
2074 | }; | |
2075 | ||
2076 | static int restore_selected_frame PARAMS ((char *)); | |
2077 | ||
2078 | /* Restore the selected frame. args is really a struct | |
2079 | restore_selected_frame_args * (declared as char * for catch_errors) | |
2080 | telling us what frame to restore. Returns 1 for success, or 0 for | |
2081 | failure. An error message will have been printed on error. */ | |
4cc1b3f7 | 2082 | |
37c99ddb JK |
2083 | static int |
2084 | restore_selected_frame (args) | |
2085 | char *args; | |
2086 | { | |
2087 | struct restore_selected_frame_args *fr = | |
2088 | (struct restore_selected_frame_args *) args; | |
4cc1b3f7 | 2089 | struct frame_info *frame; |
37c99ddb JK |
2090 | int level = fr->level; |
2091 | ||
4cc1b3f7 | 2092 | frame = find_relative_frame (get_current_frame (), &level); |
37c99ddb JK |
2093 | |
2094 | /* If inf_status->selected_frame_address is NULL, there was no | |
2095 | previously selected frame. */ | |
4cc1b3f7 JK |
2096 | if (frame == NULL || |
2097 | FRAME_FP (frame) != fr->frame_address || | |
37c99ddb JK |
2098 | level != 0) |
2099 | { | |
2100 | warning ("Unable to restore previously selected frame.\n"); | |
2101 | return 0; | |
2102 | } | |
4cc1b3f7 | 2103 | select_frame (frame, fr->level); |
37c99ddb JK |
2104 | return(1); |
2105 | } | |
2106 | ||
bd5635a1 RP |
2107 | void |
2108 | restore_inferior_status (inf_status) | |
2109 | struct inferior_status *inf_status; | |
2110 | { | |
bd5635a1 RP |
2111 | stop_signal = inf_status->stop_signal; |
2112 | stop_pc = inf_status->stop_pc; | |
bd5635a1 RP |
2113 | stop_step = inf_status->stop_step; |
2114 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
2115 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
2116 | trap_expected = inf_status->trap_expected; | |
2117 | step_range_start = inf_status->step_range_start; | |
2118 | step_range_end = inf_status->step_range_end; | |
2119 | step_frame_address = inf_status->step_frame_address; | |
2120 | step_over_calls = inf_status->step_over_calls; | |
bd5635a1 RP |
2121 | stop_after_trap = inf_status->stop_after_trap; |
2122 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
2123 | bpstat_clear (&stop_bpstat); | |
2124 | stop_bpstat = inf_status->stop_bpstat; | |
2125 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
2126 | proceed_to_finish = inf_status->proceed_to_finish; | |
2127 | ||
072b552a | 2128 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
bd5635a1 RP |
2129 | |
2130 | /* The inferior can be gone if the user types "print exit(0)" | |
2131 | (and perhaps other times). */ | |
37c99ddb JK |
2132 | if (target_has_execution) |
2133 | write_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
2134 | ||
2135 | /* The inferior can be gone if the user types "print exit(0)" | |
2136 | (and perhaps other times). */ | |
2137 | ||
2138 | /* FIXME: If we are being called after stopping in a function which | |
2139 | is called from gdb, we should not be trying to restore the | |
2140 | selected frame; it just prints a spurious error message (The | |
2141 | message is useful, however, in detecting bugs in gdb (like if gdb | |
2142 | clobbers the stack)). In fact, should we be restoring the | |
2143 | inferior status at all in that case? . */ | |
2144 | ||
bd5635a1 RP |
2145 | if (target_has_stack && inf_status->restore_stack_info) |
2146 | { | |
37c99ddb JK |
2147 | struct restore_selected_frame_args fr; |
2148 | fr.level = inf_status->selected_level; | |
2149 | fr.frame_address = inf_status->selected_frame_address; | |
2150 | /* The point of catch_errors is that if the stack is clobbered, | |
2151 | walking the stack might encounter a garbage pointer and error() | |
2152 | trying to dereference it. */ | |
2153 | if (catch_errors (restore_selected_frame, &fr, | |
2154 | "Unable to restore previously selected frame:\n", | |
2155 | RETURN_MASK_ERROR) == 0) | |
2156 | /* Error in restoring the selected frame. Select the innermost | |
2157 | frame. */ | |
2158 | select_frame (get_current_frame (), 0); | |
bd5635a1 RP |
2159 | } |
2160 | } | |
2161 | ||
2162 | \f | |
2163 | void | |
2164 | _initialize_infrun () | |
2165 | { | |
2166 | register int i; | |
e37a6e9c | 2167 | register int numsigs; |
bd5635a1 RP |
2168 | |
2169 | add_info ("signals", signals_info, | |
2170 | "What debugger does when program gets various signals.\n\ | |
c66ed884 | 2171 | Specify a signal as argument to print info on that signal only."); |
6b50c5c2 | 2172 | add_info_alias ("handle", "signals", 0); |
bd5635a1 RP |
2173 | |
2174 | add_com ("handle", class_run, handle_command, | |
c66ed884 SG |
2175 | concat ("Specify how to handle a signal.\n\ |
2176 | Args are signals and actions to apply to those signals.\n\ | |
2177 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
2178 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
2179 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
072b552a | 2180 | The special arg \"all\" is recognized to mean all signals except those\n\ |
c66ed884 SG |
2181 | used by the debugger, typically SIGTRAP and SIGINT.\n", |
2182 | "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
072b552a | 2183 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
bd5635a1 | 2184 | Stop means reenter debugger if this signal happens (implies print).\n\ |
072b552a | 2185 | Print means print a message if this signal happens.\n\ |
bd5635a1 | 2186 | Pass means let program see this signal; otherwise program doesn't know.\n\ |
072b552a | 2187 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
c66ed884 | 2188 | Pass and Stop may be combined.", NULL)); |
bd5635a1 | 2189 | |
a8a69e63 | 2190 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, |
3950a34e RP |
2191 | "There is no `stop' command, but you can set a hook on `stop'.\n\ |
2192 | This allows you to set a list of commands to be run each time execution\n\ | |
fee44494 | 2193 | of the program stops.", &cmdlist); |
3950a34e | 2194 | |
67ac9759 JK |
2195 | numsigs = (int)TARGET_SIGNAL_LAST; |
2196 | signal_stop = (unsigned char *) | |
2197 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
2198 | signal_print = (unsigned char *) | |
2199 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
072b552a | 2200 | signal_program = (unsigned char *) |
67ac9759 | 2201 | xmalloc (sizeof (signal_program[0]) * numsigs); |
e37a6e9c | 2202 | for (i = 0; i < numsigs; i++) |
bd5635a1 RP |
2203 | { |
2204 | signal_stop[i] = 1; | |
2205 | signal_print[i] = 1; | |
2206 | signal_program[i] = 1; | |
2207 | } | |
2208 | ||
2209 | /* Signals caused by debugger's own actions | |
2210 | should not be given to the program afterwards. */ | |
67ac9759 JK |
2211 | signal_program[TARGET_SIGNAL_TRAP] = 0; |
2212 | signal_program[TARGET_SIGNAL_INT] = 0; | |
bd5635a1 RP |
2213 | |
2214 | /* Signals that are not errors should not normally enter the debugger. */ | |
67ac9759 JK |
2215 | signal_stop[TARGET_SIGNAL_ALRM] = 0; |
2216 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
2217 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
2218 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
2219 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
2220 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
2221 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
2222 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
2223 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
2224 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4d4f2d50 JK |
2225 | signal_stop[TARGET_SIGNAL_POLL] = 0; |
2226 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
67ac9759 JK |
2227 | signal_stop[TARGET_SIGNAL_URG] = 0; |
2228 | signal_print[TARGET_SIGNAL_URG] = 0; | |
87273c71 JL |
2229 | |
2230 | #ifdef SOLIB_ADD | |
2231 | add_show_from_set | |
2232 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
2233 | (char *) &stop_on_solib_events, | |
2234 | "Set stopping for shared library events.\n\ | |
2235 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
2236 | notifies gdb of shared library events. The most common event of interest\n\ | |
2237 | to the user would be loading/unloading of a new library.\n", | |
2238 | &setlist), | |
2239 | &showlist); | |
2240 | #endif | |
bd5635a1 | 2241 | } |