Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c AC |
3 | |
4 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, | |
c6f0559b AC |
5 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free |
6 | Software Foundation, Inc. | |
c906108c | 7 | |
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
10 | This program is free software; you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
c906108c | 14 | |
c5aa993b JM |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
c906108c | 19 | |
c5aa993b JM |
20 | You should have received a copy of the GNU General Public License |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
24 | |
25 | #include "defs.h" | |
26 | #include "gdb_string.h" | |
27 | #include <ctype.h> | |
28 | #include "symtab.h" | |
29 | #include "frame.h" | |
30 | #include "inferior.h" | |
60250e8b | 31 | #include "exceptions.h" |
c906108c | 32 | #include "breakpoint.h" |
03f2053f | 33 | #include "gdb_wait.h" |
c906108c SS |
34 | #include "gdbcore.h" |
35 | #include "gdbcmd.h" | |
210661e7 | 36 | #include "cli/cli-script.h" |
c906108c SS |
37 | #include "target.h" |
38 | #include "gdbthread.h" | |
39 | #include "annotate.h" | |
1adeb98a | 40 | #include "symfile.h" |
7a292a7a | 41 | #include "top.h" |
c906108c | 42 | #include <signal.h> |
2acceee2 | 43 | #include "inf-loop.h" |
4e052eda | 44 | #include "regcache.h" |
fd0407d6 | 45 | #include "value.h" |
06600e06 | 46 | #include "observer.h" |
f636b87d | 47 | #include "language.h" |
9f976b41 | 48 | #include "gdb_assert.h" |
c906108c SS |
49 | |
50 | /* Prototypes for local functions */ | |
51 | ||
96baa820 | 52 | static void signals_info (char *, int); |
c906108c | 53 | |
96baa820 | 54 | static void handle_command (char *, int); |
c906108c | 55 | |
96baa820 | 56 | static void sig_print_info (enum target_signal); |
c906108c | 57 | |
96baa820 | 58 | static void sig_print_header (void); |
c906108c | 59 | |
74b7792f | 60 | static void resume_cleanups (void *); |
c906108c | 61 | |
96baa820 | 62 | static int hook_stop_stub (void *); |
c906108c | 63 | |
96baa820 JM |
64 | static int restore_selected_frame (void *); |
65 | ||
66 | static void build_infrun (void); | |
67 | ||
4ef3f3be | 68 | static int follow_fork (void); |
96baa820 JM |
69 | |
70 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 71 | struct cmd_list_element *c); |
96baa820 | 72 | |
96baa820 JM |
73 | struct execution_control_state; |
74 | ||
75 | static int currently_stepping (struct execution_control_state *ecs); | |
76 | ||
77 | static void xdb_handle_command (char *args, int from_tty); | |
78 | ||
ea67f13b DJ |
79 | static int prepare_to_proceed (void); |
80 | ||
96baa820 | 81 | void _initialize_infrun (void); |
43ff13b4 | 82 | |
c906108c SS |
83 | int inferior_ignoring_startup_exec_events = 0; |
84 | int inferior_ignoring_leading_exec_events = 0; | |
85 | ||
5fbbeb29 CF |
86 | /* When set, stop the 'step' command if we enter a function which has |
87 | no line number information. The normal behavior is that we step | |
88 | over such function. */ | |
89 | int step_stop_if_no_debug = 0; | |
90 | ||
43ff13b4 | 91 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 92 | |
43ff13b4 JM |
93 | int sync_execution = 0; |
94 | ||
c906108c SS |
95 | /* wait_for_inferior and normal_stop use this to notify the user |
96 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
97 | running in. */ |
98 | ||
39f77062 | 99 | static ptid_t previous_inferior_ptid; |
7a292a7a SS |
100 | |
101 | /* This is true for configurations that may follow through execl() and | |
102 | similar functions. At present this is only true for HP-UX native. */ | |
103 | ||
104 | #ifndef MAY_FOLLOW_EXEC | |
105 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
106 | #endif |
107 | ||
7a292a7a SS |
108 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
109 | ||
527159b7 RC |
110 | static int debug_infrun = 0; |
111 | ||
d4f3574e SS |
112 | /* If the program uses ELF-style shared libraries, then calls to |
113 | functions in shared libraries go through stubs, which live in a | |
114 | table called the PLT (Procedure Linkage Table). The first time the | |
115 | function is called, the stub sends control to the dynamic linker, | |
116 | which looks up the function's real address, patches the stub so | |
117 | that future calls will go directly to the function, and then passes | |
118 | control to the function. | |
119 | ||
120 | If we are stepping at the source level, we don't want to see any of | |
121 | this --- we just want to skip over the stub and the dynamic linker. | |
122 | The simple approach is to single-step until control leaves the | |
123 | dynamic linker. | |
124 | ||
ca557f44 AC |
125 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
126 | dynamic linker calls functions in the shared C library, so you | |
127 | can't tell from the PC alone whether the dynamic linker is still | |
128 | running. In this case, we use a step-resume breakpoint to get us | |
129 | past the dynamic linker, as if we were using "next" to step over a | |
130 | function call. | |
d4f3574e SS |
131 | |
132 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
133 | linker code or not. Normally, this means we single-step. However, | |
134 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
135 | address where we can place a step-resume breakpoint to get past the | |
136 | linker's symbol resolution function. | |
137 | ||
138 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
139 | pretty portable way, by comparing the PC against the address ranges | |
140 | of the dynamic linker's sections. | |
141 | ||
142 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
143 | it depends on internal details of the dynamic linker. It's usually | |
144 | not too hard to figure out where to put a breakpoint, but it | |
145 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
146 | sanity checking. If it can't figure things out, returning zero and | |
147 | getting the (possibly confusing) stepping behavior is better than | |
148 | signalling an error, which will obscure the change in the | |
149 | inferior's state. */ | |
c906108c SS |
150 | |
151 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
152 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
153 | #endif | |
154 | ||
c906108c SS |
155 | /* This function returns TRUE if pc is the address of an instruction |
156 | that lies within the dynamic linker (such as the event hook, or the | |
157 | dld itself). | |
158 | ||
159 | This function must be used only when a dynamic linker event has | |
160 | been caught, and the inferior is being stepped out of the hook, or | |
161 | undefined results are guaranteed. */ | |
162 | ||
163 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
164 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
165 | #endif | |
166 | ||
c2c6d25f JM |
167 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
168 | can't remove it. Instead, we have to advance the PC to the next | |
169 | instruction. This macro should expand to a pointer to a function that | |
170 | does that, or zero if we have no such function. If we don't have a | |
171 | definition for it, we have to report an error. */ | |
488f131b | 172 | #ifndef SKIP_PERMANENT_BREAKPOINT |
c2c6d25f JM |
173 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) |
174 | static void | |
c2d11a7d | 175 | default_skip_permanent_breakpoint (void) |
c2c6d25f | 176 | { |
255e7dbf | 177 | error ("\ |
c2c6d25f JM |
178 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ |
179 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
255e7dbf | 180 | a command like `return' or `jump' to continue execution."); |
c2c6d25f JM |
181 | } |
182 | #endif | |
488f131b | 183 | |
c2c6d25f | 184 | |
7a292a7a SS |
185 | /* Convert the #defines into values. This is temporary until wfi control |
186 | flow is completely sorted out. */ | |
187 | ||
188 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
189 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
190 | #else | |
191 | #undef HAVE_STEPPABLE_WATCHPOINT | |
192 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
193 | #endif | |
194 | ||
692590c1 MS |
195 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
196 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
197 | #else | |
198 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
199 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
200 | #endif | |
201 | ||
c906108c SS |
202 | /* Tables of how to react to signals; the user sets them. */ |
203 | ||
204 | static unsigned char *signal_stop; | |
205 | static unsigned char *signal_print; | |
206 | static unsigned char *signal_program; | |
207 | ||
208 | #define SET_SIGS(nsigs,sigs,flags) \ | |
209 | do { \ | |
210 | int signum = (nsigs); \ | |
211 | while (signum-- > 0) \ | |
212 | if ((sigs)[signum]) \ | |
213 | (flags)[signum] = 1; \ | |
214 | } while (0) | |
215 | ||
216 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
217 | do { \ | |
218 | int signum = (nsigs); \ | |
219 | while (signum-- > 0) \ | |
220 | if ((sigs)[signum]) \ | |
221 | (flags)[signum] = 0; \ | |
222 | } while (0) | |
223 | ||
39f77062 KB |
224 | /* Value to pass to target_resume() to cause all threads to resume */ |
225 | ||
226 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
227 | |
228 | /* Command list pointer for the "stop" placeholder. */ | |
229 | ||
230 | static struct cmd_list_element *stop_command; | |
231 | ||
232 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
233 | ||
234 | static int breakpoints_inserted; | |
235 | ||
236 | /* Function inferior was in as of last step command. */ | |
237 | ||
238 | static struct symbol *step_start_function; | |
239 | ||
240 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
241 | ||
242 | static int trap_expected; | |
243 | ||
244 | #ifdef SOLIB_ADD | |
245 | /* Nonzero if we want to give control to the user when we're notified | |
246 | of shared library events by the dynamic linker. */ | |
247 | static int stop_on_solib_events; | |
248 | #endif | |
249 | ||
c906108c SS |
250 | /* Nonzero means expecting a trace trap |
251 | and should stop the inferior and return silently when it happens. */ | |
252 | ||
253 | int stop_after_trap; | |
254 | ||
255 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
256 | It is used after attach, due to attaching to a process; | |
257 | when running in the shell before the child program has been exec'd; | |
258 | and when running some kinds of remote stuff (FIXME?). */ | |
259 | ||
c0236d92 | 260 | enum stop_kind stop_soon; |
c906108c SS |
261 | |
262 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
263 | situation when stop_registers should be saved. */ | |
264 | ||
265 | int proceed_to_finish; | |
266 | ||
267 | /* Save register contents here when about to pop a stack dummy frame, | |
268 | if-and-only-if proceed_to_finish is set. | |
269 | Thus this contains the return value from the called function (assuming | |
270 | values are returned in a register). */ | |
271 | ||
72cec141 | 272 | struct regcache *stop_registers; |
c906108c SS |
273 | |
274 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
275 | ||
276 | static int breakpoints_failed; | |
277 | ||
278 | /* Nonzero after stop if current stack frame should be printed. */ | |
279 | ||
280 | static int stop_print_frame; | |
281 | ||
282 | static struct breakpoint *step_resume_breakpoint = NULL; | |
c906108c | 283 | |
e02bc4cc | 284 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
285 | returned by target_wait()/deprecated_target_wait_hook(). This |
286 | information is returned by get_last_target_status(). */ | |
39f77062 | 287 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
288 | static struct target_waitstatus target_last_waitstatus; |
289 | ||
c906108c SS |
290 | /* This is used to remember when a fork, vfork or exec event |
291 | was caught by a catchpoint, and thus the event is to be | |
292 | followed at the next resume of the inferior, and not | |
293 | immediately. */ | |
294 | static struct | |
488f131b JB |
295 | { |
296 | enum target_waitkind kind; | |
297 | struct | |
c906108c | 298 | { |
488f131b | 299 | int parent_pid; |
488f131b | 300 | int child_pid; |
c906108c | 301 | } |
488f131b JB |
302 | fork_event; |
303 | char *execd_pathname; | |
304 | } | |
c906108c SS |
305 | pending_follow; |
306 | ||
53904c9e AC |
307 | static const char follow_fork_mode_child[] = "child"; |
308 | static const char follow_fork_mode_parent[] = "parent"; | |
309 | ||
488f131b | 310 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
311 | follow_fork_mode_child, |
312 | follow_fork_mode_parent, | |
313 | NULL | |
ef346e04 | 314 | }; |
c906108c | 315 | |
53904c9e | 316 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
c906108c SS |
317 | \f |
318 | ||
6604731b | 319 | static int |
4ef3f3be | 320 | follow_fork (void) |
c906108c | 321 | { |
ea1dd7bc | 322 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
c906108c | 323 | |
6604731b | 324 | return target_follow_fork (follow_child); |
c906108c SS |
325 | } |
326 | ||
6604731b DJ |
327 | void |
328 | follow_inferior_reset_breakpoints (void) | |
c906108c | 329 | { |
6604731b DJ |
330 | /* Was there a step_resume breakpoint? (There was if the user |
331 | did a "next" at the fork() call.) If so, explicitly reset its | |
332 | thread number. | |
333 | ||
334 | step_resumes are a form of bp that are made to be per-thread. | |
335 | Since we created the step_resume bp when the parent process | |
336 | was being debugged, and now are switching to the child process, | |
337 | from the breakpoint package's viewpoint, that's a switch of | |
338 | "threads". We must update the bp's notion of which thread | |
339 | it is for, or it'll be ignored when it triggers. */ | |
340 | ||
341 | if (step_resume_breakpoint) | |
342 | breakpoint_re_set_thread (step_resume_breakpoint); | |
343 | ||
344 | /* Reinsert all breakpoints in the child. The user may have set | |
345 | breakpoints after catching the fork, in which case those | |
346 | were never set in the child, but only in the parent. This makes | |
347 | sure the inserted breakpoints match the breakpoint list. */ | |
348 | ||
349 | breakpoint_re_set (); | |
350 | insert_breakpoints (); | |
c906108c | 351 | } |
c906108c | 352 | |
1adeb98a FN |
353 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
354 | ||
c906108c | 355 | static void |
96baa820 | 356 | follow_exec (int pid, char *execd_pathname) |
c906108c | 357 | { |
c906108c | 358 | int saved_pid = pid; |
7a292a7a SS |
359 | struct target_ops *tgt; |
360 | ||
361 | if (!may_follow_exec) | |
362 | return; | |
c906108c | 363 | |
c906108c SS |
364 | /* This is an exec event that we actually wish to pay attention to. |
365 | Refresh our symbol table to the newly exec'd program, remove any | |
366 | momentary bp's, etc. | |
367 | ||
368 | If there are breakpoints, they aren't really inserted now, | |
369 | since the exec() transformed our inferior into a fresh set | |
370 | of instructions. | |
371 | ||
372 | We want to preserve symbolic breakpoints on the list, since | |
373 | we have hopes that they can be reset after the new a.out's | |
374 | symbol table is read. | |
375 | ||
376 | However, any "raw" breakpoints must be removed from the list | |
377 | (e.g., the solib bp's), since their address is probably invalid | |
378 | now. | |
379 | ||
380 | And, we DON'T want to call delete_breakpoints() here, since | |
381 | that may write the bp's "shadow contents" (the instruction | |
382 | value that was overwritten witha TRAP instruction). Since | |
383 | we now have a new a.out, those shadow contents aren't valid. */ | |
384 | update_breakpoints_after_exec (); | |
385 | ||
386 | /* If there was one, it's gone now. We cannot truly step-to-next | |
387 | statement through an exec(). */ | |
388 | step_resume_breakpoint = NULL; | |
389 | step_range_start = 0; | |
390 | step_range_end = 0; | |
391 | ||
c906108c SS |
392 | /* What is this a.out's name? */ |
393 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
394 | ||
395 | /* We've followed the inferior through an exec. Therefore, the | |
396 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
397 | |
398 | /* First collect the run target in effect. */ | |
399 | tgt = find_run_target (); | |
400 | /* If we can't find one, things are in a very strange state... */ | |
401 | if (tgt == NULL) | |
402 | error ("Could find run target to save before following exec"); | |
403 | ||
c906108c SS |
404 | gdb_flush (gdb_stdout); |
405 | target_mourn_inferior (); | |
39f77062 | 406 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 407 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 408 | push_target (tgt); |
c906108c SS |
409 | |
410 | /* That a.out is now the one to use. */ | |
411 | exec_file_attach (execd_pathname, 0); | |
412 | ||
413 | /* And also is where symbols can be found. */ | |
1adeb98a | 414 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
415 | |
416 | /* Reset the shared library package. This ensures that we get | |
417 | a shlib event when the child reaches "_start", at which point | |
418 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 419 | #if defined(SOLIB_RESTART) |
c906108c | 420 | SOLIB_RESTART (); |
7a292a7a SS |
421 | #endif |
422 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 423 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
7a292a7a | 424 | #endif |
c906108c SS |
425 | |
426 | /* Reinsert all breakpoints. (Those which were symbolic have | |
427 | been reset to the proper address in the new a.out, thanks | |
428 | to symbol_file_command...) */ | |
429 | insert_breakpoints (); | |
430 | ||
431 | /* The next resume of this inferior should bring it to the shlib | |
432 | startup breakpoints. (If the user had also set bp's on | |
433 | "main" from the old (parent) process, then they'll auto- | |
434 | matically get reset there in the new process.) */ | |
c906108c SS |
435 | } |
436 | ||
437 | /* Non-zero if we just simulating a single-step. This is needed | |
438 | because we cannot remove the breakpoints in the inferior process | |
439 | until after the `wait' in `wait_for_inferior'. */ | |
440 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
441 | |
442 | /* The thread we inserted single-step breakpoints for. */ | |
443 | static ptid_t singlestep_ptid; | |
444 | ||
445 | /* If another thread hit the singlestep breakpoint, we save the original | |
446 | thread here so that we can resume single-stepping it later. */ | |
447 | static ptid_t saved_singlestep_ptid; | |
448 | static int stepping_past_singlestep_breakpoint; | |
c906108c SS |
449 | \f |
450 | ||
451 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 452 | static void |
74b7792f | 453 | resume_cleanups (void *ignore) |
c906108c SS |
454 | { |
455 | normal_stop (); | |
456 | } | |
457 | ||
53904c9e AC |
458 | static const char schedlock_off[] = "off"; |
459 | static const char schedlock_on[] = "on"; | |
460 | static const char schedlock_step[] = "step"; | |
461 | static const char *scheduler_mode = schedlock_off; | |
488f131b | 462 | static const char *scheduler_enums[] = { |
ef346e04 AC |
463 | schedlock_off, |
464 | schedlock_on, | |
465 | schedlock_step, | |
466 | NULL | |
467 | }; | |
c906108c SS |
468 | |
469 | static void | |
96baa820 | 470 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 471 | { |
cb1a6d5f AC |
472 | /* NOTE: cagney/2002-03-17: The deprecated_add_show_from_set() |
473 | function clones the set command passed as a parameter. The clone | |
474 | operation will include (BUG?) any ``set'' command callback, if | |
475 | present. Commands like ``info set'' call all the ``show'' | |
476 | command callbacks. Unfortunately, for ``show'' commands cloned | |
477 | from ``set'', this includes callbacks belonging to ``set'' | |
478 | commands. Making this worse, this only occures if | |
479 | deprecated_add_show_from_set() is called after add_cmd_sfunc() | |
480 | (BUG?). */ | |
1868c04e | 481 | if (cmd_type (c) == set_cmd) |
c906108c SS |
482 | if (!target_can_lock_scheduler) |
483 | { | |
484 | scheduler_mode = schedlock_off; | |
488f131b | 485 | error ("Target '%s' cannot support this command.", target_shortname); |
c906108c SS |
486 | } |
487 | } | |
488 | ||
489 | ||
490 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
491 | wants to interrupt some lengthy single-stepping operation | |
492 | (for child processes, the SIGINT goes to the inferior, and so | |
493 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
494 | other targets, that's not true). | |
495 | ||
496 | STEP nonzero if we should step (zero to continue instead). | |
497 | SIG is the signal to give the inferior (zero for none). */ | |
498 | void | |
96baa820 | 499 | resume (int step, enum target_signal sig) |
c906108c SS |
500 | { |
501 | int should_resume = 1; | |
74b7792f | 502 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
503 | QUIT; |
504 | ||
527159b7 | 505 | if (debug_infrun) |
8a9de0e4 AC |
506 | fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n", |
507 | step, sig); | |
527159b7 | 508 | |
ef5cf84e MS |
509 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
510 | ||
c906108c | 511 | |
692590c1 MS |
512 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
513 | over an instruction that causes a page fault without triggering | |
514 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
515 | stop, because the hardware watchpoint is not triggered, but it forgets | |
516 | the step request and continues the program normally. | |
517 | Work around the problem by removing hardware watchpoints if a step is | |
518 | requested, GDB will check for a hardware watchpoint trigger after the | |
519 | step anyway. */ | |
520 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
521 | remove_hw_watchpoints (); | |
488f131b | 522 | |
692590c1 | 523 | |
c2c6d25f JM |
524 | /* Normally, by the time we reach `resume', the breakpoints are either |
525 | removed or inserted, as appropriate. The exception is if we're sitting | |
526 | at a permanent breakpoint; we need to step over it, but permanent | |
527 | breakpoints can't be removed. So we have to test for it here. */ | |
528 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
529 | SKIP_PERMANENT_BREAKPOINT (); | |
530 | ||
b0ed3589 | 531 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
532 | { |
533 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 534 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
535 | /* ...and don't ask hardware to do it. */ |
536 | step = 0; | |
537 | /* and do not pull these breakpoints until after a `wait' in | |
538 | `wait_for_inferior' */ | |
539 | singlestep_breakpoints_inserted_p = 1; | |
9f976b41 | 540 | singlestep_ptid = inferior_ptid; |
c906108c SS |
541 | } |
542 | ||
c906108c | 543 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 544 | now to be followed, then do so. */ |
c906108c SS |
545 | switch (pending_follow.kind) |
546 | { | |
6604731b DJ |
547 | case TARGET_WAITKIND_FORKED: |
548 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 549 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
550 | if (follow_fork ()) |
551 | should_resume = 0; | |
c906108c SS |
552 | break; |
553 | ||
6604731b | 554 | case TARGET_WAITKIND_EXECD: |
c906108c | 555 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 556 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
557 | break; |
558 | ||
559 | default: | |
560 | break; | |
561 | } | |
c906108c SS |
562 | |
563 | /* Install inferior's terminal modes. */ | |
564 | target_terminal_inferior (); | |
565 | ||
566 | if (should_resume) | |
567 | { | |
39f77062 | 568 | ptid_t resume_ptid; |
dfcd3bfb | 569 | |
488f131b | 570 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e | 571 | |
8fb3e588 AC |
572 | if ((step || singlestep_breakpoints_inserted_p) |
573 | && (stepping_past_singlestep_breakpoint | |
574 | || (!breakpoints_inserted && breakpoint_here_p (read_pc ())))) | |
c906108c | 575 | { |
ef5cf84e MS |
576 | /* Stepping past a breakpoint without inserting breakpoints. |
577 | Make sure only the current thread gets to step, so that | |
578 | other threads don't sneak past breakpoints while they are | |
579 | not inserted. */ | |
c906108c | 580 | |
ef5cf84e | 581 | resume_ptid = inferior_ptid; |
c906108c | 582 | } |
ef5cf84e | 583 | |
8fb3e588 AC |
584 | if ((scheduler_mode == schedlock_on) |
585 | || (scheduler_mode == schedlock_step | |
586 | && (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 587 | { |
ef5cf84e | 588 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 589 | resume_ptid = inferior_ptid; |
c906108c | 590 | } |
ef5cf84e | 591 | |
c4ed33b9 AC |
592 | if (CANNOT_STEP_BREAKPOINT) |
593 | { | |
594 | /* Most targets can step a breakpoint instruction, thus | |
595 | executing it normally. But if this one cannot, just | |
596 | continue and we will hit it anyway. */ | |
597 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
598 | step = 0; | |
599 | } | |
39f77062 | 600 | target_resume (resume_ptid, step, sig); |
c906108c SS |
601 | } |
602 | ||
603 | discard_cleanups (old_cleanups); | |
604 | } | |
605 | \f | |
606 | ||
607 | /* Clear out all variables saying what to do when inferior is continued. | |
608 | First do this, then set the ones you want, then call `proceed'. */ | |
609 | ||
610 | void | |
96baa820 | 611 | clear_proceed_status (void) |
c906108c SS |
612 | { |
613 | trap_expected = 0; | |
614 | step_range_start = 0; | |
615 | step_range_end = 0; | |
aa0cd9c1 | 616 | step_frame_id = null_frame_id; |
5fbbeb29 | 617 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c | 618 | stop_after_trap = 0; |
c0236d92 | 619 | stop_soon = NO_STOP_QUIETLY; |
c906108c SS |
620 | proceed_to_finish = 0; |
621 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
622 | ||
623 | /* Discard any remaining commands or status from previous stop. */ | |
624 | bpstat_clear (&stop_bpstat); | |
625 | } | |
626 | ||
ea67f13b DJ |
627 | /* This should be suitable for any targets that support threads. */ |
628 | ||
629 | static int | |
630 | prepare_to_proceed (void) | |
631 | { | |
632 | ptid_t wait_ptid; | |
633 | struct target_waitstatus wait_status; | |
634 | ||
635 | /* Get the last target status returned by target_wait(). */ | |
636 | get_last_target_status (&wait_ptid, &wait_status); | |
637 | ||
638 | /* Make sure we were stopped either at a breakpoint, or because | |
639 | of a Ctrl-C. */ | |
640 | if (wait_status.kind != TARGET_WAITKIND_STOPPED | |
8fb3e588 AC |
641 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
642 | && wait_status.value.sig != TARGET_SIGNAL_INT)) | |
ea67f13b DJ |
643 | { |
644 | return 0; | |
645 | } | |
646 | ||
647 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
648 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
649 | { | |
650 | /* Switched over from WAIT_PID. */ | |
651 | CORE_ADDR wait_pc = read_pc_pid (wait_ptid); | |
652 | ||
653 | if (wait_pc != read_pc ()) | |
654 | { | |
655 | /* Switch back to WAIT_PID thread. */ | |
656 | inferior_ptid = wait_ptid; | |
657 | ||
658 | /* FIXME: This stuff came from switch_to_thread() in | |
659 | thread.c (which should probably be a public function). */ | |
660 | flush_cached_frames (); | |
661 | registers_changed (); | |
662 | stop_pc = wait_pc; | |
663 | select_frame (get_current_frame ()); | |
664 | } | |
665 | ||
8fb3e588 AC |
666 | /* We return 1 to indicate that there is a breakpoint here, |
667 | so we need to step over it before continuing to avoid | |
668 | hitting it straight away. */ | |
669 | if (breakpoint_here_p (wait_pc)) | |
670 | return 1; | |
ea67f13b DJ |
671 | } |
672 | ||
673 | return 0; | |
8fb3e588 | 674 | |
ea67f13b | 675 | } |
e4846b08 JJ |
676 | |
677 | /* Record the pc of the program the last time it stopped. This is | |
678 | just used internally by wait_for_inferior, but need to be preserved | |
679 | over calls to it and cleared when the inferior is started. */ | |
680 | static CORE_ADDR prev_pc; | |
681 | ||
c906108c SS |
682 | /* Basic routine for continuing the program in various fashions. |
683 | ||
684 | ADDR is the address to resume at, or -1 for resume where stopped. | |
685 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 686 | or -1 for act according to how it stopped. |
c906108c | 687 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
688 | -1 means return after that and print nothing. |
689 | You should probably set various step_... variables | |
690 | before calling here, if you are stepping. | |
c906108c SS |
691 | |
692 | You should call clear_proceed_status before calling proceed. */ | |
693 | ||
694 | void | |
96baa820 | 695 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
696 | { |
697 | int oneproc = 0; | |
698 | ||
699 | if (step > 0) | |
700 | step_start_function = find_pc_function (read_pc ()); | |
701 | if (step < 0) | |
702 | stop_after_trap = 1; | |
703 | ||
2acceee2 | 704 | if (addr == (CORE_ADDR) -1) |
c906108c | 705 | { |
c906108c | 706 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
3352ef37 AC |
707 | /* There is a breakpoint at the address we will resume at, |
708 | step one instruction before inserting breakpoints so that | |
709 | we do not stop right away (and report a second hit at this | |
710 | breakpoint). */ | |
c906108c | 711 | oneproc = 1; |
3352ef37 AC |
712 | else if (gdbarch_single_step_through_delay_p (current_gdbarch) |
713 | && gdbarch_single_step_through_delay (current_gdbarch, | |
714 | get_current_frame ())) | |
715 | /* We stepped onto an instruction that needs to be stepped | |
716 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
717 | oneproc = 1; |
718 | } | |
719 | else | |
720 | { | |
721 | write_pc (addr); | |
c906108c SS |
722 | } |
723 | ||
527159b7 | 724 | if (debug_infrun) |
8a9de0e4 AC |
725 | fprintf_unfiltered (gdb_stdlog, |
726 | "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", | |
727 | paddr_nz (addr), siggnal, step); | |
527159b7 | 728 | |
c906108c SS |
729 | /* In a multi-threaded task we may select another thread |
730 | and then continue or step. | |
731 | ||
732 | But if the old thread was stopped at a breakpoint, it | |
733 | will immediately cause another breakpoint stop without | |
734 | any execution (i.e. it will report a breakpoint hit | |
735 | incorrectly). So we must step over it first. | |
736 | ||
ea67f13b | 737 | prepare_to_proceed checks the current thread against the thread |
c906108c SS |
738 | that reported the most recent event. If a step-over is required |
739 | it returns TRUE and sets the current thread to the old thread. */ | |
ea67f13b DJ |
740 | if (prepare_to_proceed () && breakpoint_here_p (read_pc ())) |
741 | oneproc = 1; | |
c906108c | 742 | |
c906108c SS |
743 | if (oneproc) |
744 | /* We will get a trace trap after one instruction. | |
745 | Continue it automatically and insert breakpoints then. */ | |
746 | trap_expected = 1; | |
747 | else | |
748 | { | |
81d0cc19 GS |
749 | insert_breakpoints (); |
750 | /* If we get here there was no call to error() in | |
8fb3e588 | 751 | insert breakpoints -- so they were inserted. */ |
c906108c SS |
752 | breakpoints_inserted = 1; |
753 | } | |
754 | ||
755 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
756 | stop_signal = siggnal; | |
757 | /* If this signal should not be seen by program, | |
758 | give it zero. Used for debugging signals. */ | |
759 | else if (!signal_program[stop_signal]) | |
760 | stop_signal = TARGET_SIGNAL_0; | |
761 | ||
762 | annotate_starting (); | |
763 | ||
764 | /* Make sure that output from GDB appears before output from the | |
765 | inferior. */ | |
766 | gdb_flush (gdb_stdout); | |
767 | ||
e4846b08 JJ |
768 | /* Refresh prev_pc value just prior to resuming. This used to be |
769 | done in stop_stepping, however, setting prev_pc there did not handle | |
770 | scenarios such as inferior function calls or returning from | |
771 | a function via the return command. In those cases, the prev_pc | |
772 | value was not set properly for subsequent commands. The prev_pc value | |
773 | is used to initialize the starting line number in the ecs. With an | |
774 | invalid value, the gdb next command ends up stopping at the position | |
775 | represented by the next line table entry past our start position. | |
776 | On platforms that generate one line table entry per line, this | |
777 | is not a problem. However, on the ia64, the compiler generates | |
778 | extraneous line table entries that do not increase the line number. | |
779 | When we issue the gdb next command on the ia64 after an inferior call | |
780 | or a return command, we often end up a few instructions forward, still | |
781 | within the original line we started. | |
782 | ||
783 | An attempt was made to have init_execution_control_state () refresh | |
784 | the prev_pc value before calculating the line number. This approach | |
785 | did not work because on platforms that use ptrace, the pc register | |
786 | cannot be read unless the inferior is stopped. At that point, we | |
787 | are not guaranteed the inferior is stopped and so the read_pc () | |
788 | call can fail. Setting the prev_pc value here ensures the value is | |
8fb3e588 | 789 | updated correctly when the inferior is stopped. */ |
e4846b08 JJ |
790 | prev_pc = read_pc (); |
791 | ||
c906108c SS |
792 | /* Resume inferior. */ |
793 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
794 | ||
795 | /* Wait for it to stop (if not standalone) | |
796 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
797 | /* Do this only if we are not using the event loop, or if the target |
798 | does not support asynchronous execution. */ | |
362646f5 | 799 | if (!target_can_async_p ()) |
43ff13b4 JM |
800 | { |
801 | wait_for_inferior (); | |
802 | normal_stop (); | |
803 | } | |
c906108c | 804 | } |
c906108c SS |
805 | \f |
806 | ||
807 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 808 | |
c906108c | 809 | void |
96baa820 | 810 | start_remote (void) |
c906108c SS |
811 | { |
812 | init_thread_list (); | |
813 | init_wait_for_inferior (); | |
c0236d92 | 814 | stop_soon = STOP_QUIETLY; |
c906108c | 815 | trap_expected = 0; |
43ff13b4 | 816 | |
6426a772 JM |
817 | /* Always go on waiting for the target, regardless of the mode. */ |
818 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 819 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
820 | nothing is returned (instead of just blocking). Because of this, |
821 | targets expecting an immediate response need to, internally, set | |
822 | things up so that the target_wait() is forced to eventually | |
823 | timeout. */ | |
824 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
825 | differentiate to its caller what the state of the target is after | |
826 | the initial open has been performed. Here we're assuming that | |
827 | the target has stopped. It should be possible to eventually have | |
828 | target_open() return to the caller an indication that the target | |
829 | is currently running and GDB state should be set to the same as | |
830 | for an async run. */ | |
831 | wait_for_inferior (); | |
832 | normal_stop (); | |
c906108c SS |
833 | } |
834 | ||
835 | /* Initialize static vars when a new inferior begins. */ | |
836 | ||
837 | void | |
96baa820 | 838 | init_wait_for_inferior (void) |
c906108c SS |
839 | { |
840 | /* These are meaningless until the first time through wait_for_inferior. */ | |
841 | prev_pc = 0; | |
c906108c | 842 | |
c906108c SS |
843 | breakpoints_inserted = 0; |
844 | breakpoint_init_inferior (inf_starting); | |
845 | ||
846 | /* Don't confuse first call to proceed(). */ | |
847 | stop_signal = TARGET_SIGNAL_0; | |
848 | ||
849 | /* The first resume is not following a fork/vfork/exec. */ | |
850 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c | 851 | |
c906108c | 852 | clear_proceed_status (); |
9f976b41 DJ |
853 | |
854 | stepping_past_singlestep_breakpoint = 0; | |
c906108c | 855 | } |
c906108c | 856 | \f |
b83266a0 SS |
857 | /* This enum encodes possible reasons for doing a target_wait, so that |
858 | wfi can call target_wait in one place. (Ultimately the call will be | |
859 | moved out of the infinite loop entirely.) */ | |
860 | ||
c5aa993b JM |
861 | enum infwait_states |
862 | { | |
cd0fc7c3 SS |
863 | infwait_normal_state, |
864 | infwait_thread_hop_state, | |
cd0fc7c3 | 865 | infwait_nonstep_watch_state |
b83266a0 SS |
866 | }; |
867 | ||
11cf8741 JM |
868 | /* Why did the inferior stop? Used to print the appropriate messages |
869 | to the interface from within handle_inferior_event(). */ | |
870 | enum inferior_stop_reason | |
871 | { | |
872 | /* We don't know why. */ | |
873 | STOP_UNKNOWN, | |
874 | /* Step, next, nexti, stepi finished. */ | |
875 | END_STEPPING_RANGE, | |
876 | /* Found breakpoint. */ | |
877 | BREAKPOINT_HIT, | |
878 | /* Inferior terminated by signal. */ | |
879 | SIGNAL_EXITED, | |
880 | /* Inferior exited. */ | |
881 | EXITED, | |
882 | /* Inferior received signal, and user asked to be notified. */ | |
883 | SIGNAL_RECEIVED | |
884 | }; | |
885 | ||
cd0fc7c3 SS |
886 | /* This structure contains what used to be local variables in |
887 | wait_for_inferior. Probably many of them can return to being | |
888 | locals in handle_inferior_event. */ | |
889 | ||
c5aa993b | 890 | struct execution_control_state |
488f131b JB |
891 | { |
892 | struct target_waitstatus ws; | |
893 | struct target_waitstatus *wp; | |
894 | int another_trap; | |
895 | int random_signal; | |
896 | CORE_ADDR stop_func_start; | |
897 | CORE_ADDR stop_func_end; | |
898 | char *stop_func_name; | |
899 | struct symtab_and_line sal; | |
488f131b JB |
900 | int current_line; |
901 | struct symtab *current_symtab; | |
902 | int handling_longjmp; /* FIXME */ | |
903 | ptid_t ptid; | |
904 | ptid_t saved_inferior_ptid; | |
68f53502 | 905 | int step_after_step_resume_breakpoint; |
488f131b JB |
906 | int stepping_through_solib_after_catch; |
907 | bpstat stepping_through_solib_catchpoints; | |
488f131b JB |
908 | int new_thread_event; |
909 | struct target_waitstatus tmpstatus; | |
910 | enum infwait_states infwait_state; | |
911 | ptid_t waiton_ptid; | |
912 | int wait_some_more; | |
913 | }; | |
914 | ||
915 | void init_execution_control_state (struct execution_control_state *ecs); | |
916 | ||
917 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 918 | |
c2c6d25f | 919 | static void step_into_function (struct execution_control_state *ecs); |
44cbf7b5 AC |
920 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
921 | static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
922 | struct frame_id sr_id); | |
104c1213 JM |
923 | static void stop_stepping (struct execution_control_state *ecs); |
924 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 925 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
926 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
927 | int stop_info); | |
104c1213 | 928 | |
cd0fc7c3 SS |
929 | /* Wait for control to return from inferior to debugger. |
930 | If inferior gets a signal, we may decide to start it up again | |
931 | instead of returning. That is why there is a loop in this function. | |
932 | When this function actually returns it means the inferior | |
933 | should be left stopped and GDB should read more commands. */ | |
934 | ||
935 | void | |
96baa820 | 936 | wait_for_inferior (void) |
cd0fc7c3 SS |
937 | { |
938 | struct cleanup *old_cleanups; | |
939 | struct execution_control_state ecss; | |
940 | struct execution_control_state *ecs; | |
c906108c | 941 | |
527159b7 | 942 | if (debug_infrun) |
8a9de0e4 | 943 | fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n"); |
527159b7 | 944 | |
8601f500 | 945 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 946 | &step_resume_breakpoint); |
cd0fc7c3 SS |
947 | |
948 | /* wfi still stays in a loop, so it's OK just to take the address of | |
949 | a local to get the ecs pointer. */ | |
950 | ecs = &ecss; | |
951 | ||
952 | /* Fill in with reasonable starting values. */ | |
953 | init_execution_control_state (ecs); | |
954 | ||
c906108c | 955 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 956 | previous_inferior_ptid = inferior_ptid; |
c906108c | 957 | |
cd0fc7c3 SS |
958 | overlay_cache_invalid = 1; |
959 | ||
960 | /* We have to invalidate the registers BEFORE calling target_wait | |
961 | because they can be loaded from the target while in target_wait. | |
962 | This makes remote debugging a bit more efficient for those | |
963 | targets that provide critical registers as part of their normal | |
964 | status mechanism. */ | |
965 | ||
966 | registers_changed (); | |
b83266a0 | 967 | |
c906108c SS |
968 | while (1) |
969 | { | |
9a4105ab AC |
970 | if (deprecated_target_wait_hook) |
971 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); | |
cd0fc7c3 | 972 | else |
39f77062 | 973 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 974 | |
cd0fc7c3 SS |
975 | /* Now figure out what to do with the result of the result. */ |
976 | handle_inferior_event (ecs); | |
c906108c | 977 | |
cd0fc7c3 SS |
978 | if (!ecs->wait_some_more) |
979 | break; | |
980 | } | |
981 | do_cleanups (old_cleanups); | |
982 | } | |
c906108c | 983 | |
43ff13b4 JM |
984 | /* Asynchronous version of wait_for_inferior. It is called by the |
985 | event loop whenever a change of state is detected on the file | |
986 | descriptor corresponding to the target. It can be called more than | |
987 | once to complete a single execution command. In such cases we need | |
988 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
989 | last time that this function is called for a single execution | |
990 | command, then report to the user that the inferior has stopped, and | |
991 | do the necessary cleanups. */ | |
992 | ||
993 | struct execution_control_state async_ecss; | |
994 | struct execution_control_state *async_ecs; | |
995 | ||
996 | void | |
fba45db2 | 997 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
998 | { |
999 | static struct cleanup *old_cleanups; | |
1000 | ||
c5aa993b | 1001 | async_ecs = &async_ecss; |
43ff13b4 JM |
1002 | |
1003 | if (!async_ecs->wait_some_more) | |
1004 | { | |
488f131b | 1005 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1006 | &step_resume_breakpoint); |
43ff13b4 JM |
1007 | |
1008 | /* Fill in with reasonable starting values. */ | |
1009 | init_execution_control_state (async_ecs); | |
1010 | ||
43ff13b4 | 1011 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1012 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1013 | |
1014 | overlay_cache_invalid = 1; | |
1015 | ||
1016 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1017 | because they can be loaded from the target while in target_wait. |
1018 | This makes remote debugging a bit more efficient for those | |
1019 | targets that provide critical registers as part of their normal | |
1020 | status mechanism. */ | |
43ff13b4 JM |
1021 | |
1022 | registers_changed (); | |
1023 | } | |
1024 | ||
9a4105ab | 1025 | if (deprecated_target_wait_hook) |
488f131b | 1026 | async_ecs->ptid = |
9a4105ab | 1027 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1028 | else |
39f77062 | 1029 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1030 | |
1031 | /* Now figure out what to do with the result of the result. */ | |
1032 | handle_inferior_event (async_ecs); | |
1033 | ||
1034 | if (!async_ecs->wait_some_more) | |
1035 | { | |
adf40b2e | 1036 | /* Do only the cleanups that have been added by this |
488f131b JB |
1037 | function. Let the continuations for the commands do the rest, |
1038 | if there are any. */ | |
43ff13b4 JM |
1039 | do_exec_cleanups (old_cleanups); |
1040 | normal_stop (); | |
c2d11a7d JM |
1041 | if (step_multi && stop_step) |
1042 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1043 | else | |
1044 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1045 | } |
1046 | } | |
1047 | ||
cd0fc7c3 SS |
1048 | /* Prepare an execution control state for looping through a |
1049 | wait_for_inferior-type loop. */ | |
1050 | ||
1051 | void | |
96baa820 | 1052 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1053 | { |
c2d11a7d | 1054 | /* ecs->another_trap? */ |
cd0fc7c3 | 1055 | ecs->random_signal = 0; |
68f53502 | 1056 | ecs->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 | 1057 | ecs->handling_longjmp = 0; /* FIXME */ |
cd0fc7c3 SS |
1058 | ecs->stepping_through_solib_after_catch = 0; |
1059 | ecs->stepping_through_solib_catchpoints = NULL; | |
cd0fc7c3 SS |
1060 | ecs->sal = find_pc_line (prev_pc, 0); |
1061 | ecs->current_line = ecs->sal.line; | |
1062 | ecs->current_symtab = ecs->sal.symtab; | |
1063 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1064 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1065 | ecs->wp = &(ecs->ws); |
1066 | } | |
1067 | ||
e02bc4cc | 1068 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1069 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1070 | cached by handle_inferior_event(), which gets called immediately | |
1071 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1072 | |
1073 | void | |
488f131b | 1074 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1075 | { |
39f77062 | 1076 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1077 | *status = target_last_waitstatus; |
1078 | } | |
1079 | ||
dd80620e MS |
1080 | /* Switch thread contexts, maintaining "infrun state". */ |
1081 | ||
1082 | static void | |
1083 | context_switch (struct execution_control_state *ecs) | |
1084 | { | |
1085 | /* Caution: it may happen that the new thread (or the old one!) | |
1086 | is not in the thread list. In this case we must not attempt | |
1087 | to "switch context", or we run the risk that our context may | |
1088 | be lost. This may happen as a result of the target module | |
1089 | mishandling thread creation. */ | |
1090 | ||
1091 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) | |
488f131b | 1092 | { /* Perform infrun state context switch: */ |
dd80620e | 1093 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1094 | save_infrun_state (inferior_ptid, prev_pc, |
dd80620e | 1095 | trap_expected, step_resume_breakpoint, |
15960608 | 1096 | step_range_start, |
aa0cd9c1 | 1097 | step_range_end, &step_frame_id, |
dd80620e MS |
1098 | ecs->handling_longjmp, ecs->another_trap, |
1099 | ecs->stepping_through_solib_after_catch, | |
1100 | ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1101 | ecs->current_line, ecs->current_symtab); |
dd80620e MS |
1102 | |
1103 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1104 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1105 | &trap_expected, &step_resume_breakpoint, |
15960608 | 1106 | &step_range_start, |
aa0cd9c1 | 1107 | &step_range_end, &step_frame_id, |
dd80620e MS |
1108 | &ecs->handling_longjmp, &ecs->another_trap, |
1109 | &ecs->stepping_through_solib_after_catch, | |
1110 | &ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1111 | &ecs->current_line, &ecs->current_symtab); |
dd80620e MS |
1112 | } |
1113 | inferior_ptid = ecs->ptid; | |
1114 | } | |
1115 | ||
4fa8626c DJ |
1116 | static void |
1117 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1118 | { | |
8aad930b | 1119 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1120 | |
1121 | /* If this target does not decrement the PC after breakpoints, then | |
1122 | we have nothing to do. */ | |
1123 | if (DECR_PC_AFTER_BREAK == 0) | |
1124 | return; | |
1125 | ||
1126 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1127 | we aren't, just return. | |
9709f61c DJ |
1128 | |
1129 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
1130 | affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented | |
1131 | by software breakpoints should be handled through the normal breakpoint | |
1132 | layer. | |
8fb3e588 | 1133 | |
4fa8626c DJ |
1134 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
1135 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1136 | clear where the PC is pointing afterwards. It may not match | |
1137 | DECR_PC_AFTER_BREAK. I don't know any specific target that generates | |
1138 | these signals at breakpoints (the code has been in GDB since at least | |
1139 | 1992) so I can not guess how to handle them here. | |
8fb3e588 | 1140 | |
4fa8626c DJ |
1141 | In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS |
1142 | would have the PC after hitting a watchpoint affected by | |
1143 | DECR_PC_AFTER_BREAK. I haven't found any target with both of these set | |
1144 | in GDB history, and it seems unlikely to be correct, so | |
1145 | HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */ | |
1146 | ||
1147 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1148 | return; | |
1149 | ||
1150 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1151 | return; | |
1152 | ||
8aad930b AC |
1153 | /* Find the location where (if we've hit a breakpoint) the |
1154 | breakpoint would be. */ | |
1155 | breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK; | |
1156 | ||
1157 | if (SOFTWARE_SINGLE_STEP_P ()) | |
1158 | { | |
1159 | /* When using software single-step, a SIGTRAP can only indicate | |
8fb3e588 AC |
1160 | an inserted breakpoint. This actually makes things |
1161 | easier. */ | |
8aad930b AC |
1162 | if (singlestep_breakpoints_inserted_p) |
1163 | /* When software single stepping, the instruction at [prev_pc] | |
1164 | is never a breakpoint, but the instruction following | |
1165 | [prev_pc] (in program execution order) always is. Assume | |
1166 | that following instruction was reached and hence a software | |
1167 | breakpoint was hit. */ | |
1168 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1169 | else if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1170 | /* The inferior was free running (i.e., no single-step | |
1171 | breakpoints inserted) and it hit a software breakpoint. */ | |
1172 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1173 | } | |
1174 | else | |
1175 | { | |
1176 | /* When using hardware single-step, a SIGTRAP is reported for | |
8fb3e588 AC |
1177 | both a completed single-step and a software breakpoint. Need |
1178 | to differentiate between the two as the latter needs | |
1179 | adjusting but the former does not. */ | |
8aad930b AC |
1180 | if (currently_stepping (ecs)) |
1181 | { | |
1182 | if (prev_pc == breakpoint_pc | |
1183 | && software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1184 | /* Hardware single-stepped a software breakpoint (as | |
1185 | occures when the inferior is resumed with PC pointing | |
1186 | at not-yet-hit software breakpoint). Since the | |
1187 | breakpoint really is executed, the inferior needs to be | |
1188 | backed up to the breakpoint address. */ | |
1189 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1190 | } | |
1191 | else | |
1192 | { | |
1193 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1194 | /* The inferior was free running (i.e., no hardware | |
1195 | single-step and no possibility of a false SIGTRAP) and | |
1196 | hit a software breakpoint. */ | |
1197 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1198 | } | |
1199 | } | |
4fa8626c DJ |
1200 | } |
1201 | ||
cd0fc7c3 SS |
1202 | /* Given an execution control state that has been freshly filled in |
1203 | by an event from the inferior, figure out what it means and take | |
1204 | appropriate action. */ | |
c906108c | 1205 | |
7270d8f2 OF |
1206 | int stepped_after_stopped_by_watchpoint; |
1207 | ||
cd0fc7c3 | 1208 | void |
96baa820 | 1209 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1210 | { |
65e82032 AC |
1211 | /* NOTE: cagney/2003-03-28: If you're looking at this code and |
1212 | thinking that the variable stepped_after_stopped_by_watchpoint | |
1213 | isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT, | |
1214 | defined in the file "config/pa/nm-hppah.h", accesses the variable | |
1215 | indirectly. Mutter something rude about the HP merge. */ | |
c8edd8b4 | 1216 | int sw_single_step_trap_p = 0; |
8fb3e588 | 1217 | int stopped_by_watchpoint = -1; /* Mark as unknown. */ |
cd0fc7c3 | 1218 | |
e02bc4cc | 1219 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1220 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1221 | target_last_waitstatus = *ecs->wp; |
1222 | ||
4fa8626c DJ |
1223 | adjust_pc_after_break (ecs); |
1224 | ||
488f131b JB |
1225 | switch (ecs->infwait_state) |
1226 | { | |
1227 | case infwait_thread_hop_state: | |
527159b7 | 1228 | if (debug_infrun) |
8a9de0e4 | 1229 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
488f131b JB |
1230 | /* Cancel the waiton_ptid. */ |
1231 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 | 1232 | break; |
b83266a0 | 1233 | |
488f131b | 1234 | case infwait_normal_state: |
527159b7 | 1235 | if (debug_infrun) |
8a9de0e4 | 1236 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
488f131b JB |
1237 | stepped_after_stopped_by_watchpoint = 0; |
1238 | break; | |
b83266a0 | 1239 | |
488f131b | 1240 | case infwait_nonstep_watch_state: |
527159b7 | 1241 | if (debug_infrun) |
8a9de0e4 AC |
1242 | fprintf_unfiltered (gdb_stdlog, |
1243 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 1244 | insert_breakpoints (); |
c906108c | 1245 | |
488f131b JB |
1246 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1247 | handle things like signals arriving and other things happening | |
1248 | in combination correctly? */ | |
1249 | stepped_after_stopped_by_watchpoint = 1; | |
1250 | break; | |
65e82032 AC |
1251 | |
1252 | default: | |
1253 | internal_error (__FILE__, __LINE__, "bad switch"); | |
488f131b JB |
1254 | } |
1255 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1256 | |
488f131b | 1257 | flush_cached_frames (); |
c906108c | 1258 | |
488f131b | 1259 | /* If it's a new process, add it to the thread database */ |
c906108c | 1260 | |
488f131b | 1261 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
b9b5d7ea | 1262 | && !ptid_equal (ecs->ptid, minus_one_ptid) |
488f131b JB |
1263 | && !in_thread_list (ecs->ptid)); |
1264 | ||
1265 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1266 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1267 | { | |
1268 | add_thread (ecs->ptid); | |
c906108c | 1269 | |
488f131b JB |
1270 | ui_out_text (uiout, "[New "); |
1271 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1272 | ui_out_text (uiout, "]\n"); | |
488f131b | 1273 | } |
c906108c | 1274 | |
488f131b JB |
1275 | switch (ecs->ws.kind) |
1276 | { | |
1277 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 1278 | if (debug_infrun) |
8a9de0e4 | 1279 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
488f131b JB |
1280 | /* Ignore gracefully during startup of the inferior, as it |
1281 | might be the shell which has just loaded some objects, | |
1282 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1283 | #ifdef SOLIB_ADD |
c0236d92 | 1284 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1285 | { |
1286 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1287 | breakpoint addresses via breakpoint_re_set. */ | |
1288 | if (breakpoints_inserted) | |
1289 | remove_breakpoints (); | |
c906108c | 1290 | |
488f131b JB |
1291 | /* Check for any newly added shared libraries if we're |
1292 | supposed to be adding them automatically. Switch | |
1293 | terminal for any messages produced by | |
1294 | breakpoint_re_set. */ | |
1295 | target_terminal_ours_for_output (); | |
aff6338a | 1296 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
1297 | stack's section table is kept up-to-date. Architectures, |
1298 | (e.g., PPC64), use the section table to perform | |
1299 | operations such as address => section name and hence | |
1300 | require the table to contain all sections (including | |
1301 | those found in shared libraries). */ | |
aff6338a | 1302 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
1303 | exec_ops to SOLIB_ADD. This is because current GDB is |
1304 | only tooled to propagate section_table changes out from | |
1305 | the "current_target" (see target_resize_to_sections), and | |
1306 | not up from the exec stratum. This, of course, isn't | |
1307 | right. "infrun.c" should only interact with the | |
1308 | exec/process stratum, instead relying on the target stack | |
1309 | to propagate relevant changes (stop, section table | |
1310 | changed, ...) up to other layers. */ | |
aff6338a | 1311 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
1312 | target_terminal_inferior (); |
1313 | ||
1314 | /* Reinsert breakpoints and continue. */ | |
1315 | if (breakpoints_inserted) | |
1316 | insert_breakpoints (); | |
1317 | } | |
c906108c | 1318 | #endif |
488f131b JB |
1319 | resume (0, TARGET_SIGNAL_0); |
1320 | prepare_to_wait (ecs); | |
1321 | return; | |
c5aa993b | 1322 | |
488f131b | 1323 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 1324 | if (debug_infrun) |
8a9de0e4 | 1325 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
1326 | resume (0, TARGET_SIGNAL_0); |
1327 | prepare_to_wait (ecs); | |
1328 | return; | |
c5aa993b | 1329 | |
488f131b | 1330 | case TARGET_WAITKIND_EXITED: |
527159b7 | 1331 | if (debug_infrun) |
8a9de0e4 | 1332 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
488f131b JB |
1333 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1334 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1335 | ||
1336 | /* Record the exit code in the convenience variable $_exitcode, so | |
1337 | that the user can inspect this again later. */ | |
1338 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1339 | value_from_longest (builtin_type_int, | |
1340 | (LONGEST) ecs->ws.value.integer)); | |
1341 | gdb_flush (gdb_stdout); | |
1342 | target_mourn_inferior (); | |
1343 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1344 | stop_print_frame = 0; | |
1345 | stop_stepping (ecs); | |
1346 | return; | |
c5aa993b | 1347 | |
488f131b | 1348 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 1349 | if (debug_infrun) |
8a9de0e4 | 1350 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
488f131b JB |
1351 | stop_print_frame = 0; |
1352 | stop_signal = ecs->ws.value.sig; | |
1353 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1354 | |
488f131b JB |
1355 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1356 | reach here unless the inferior is dead. However, for years | |
1357 | target_kill() was called here, which hints that fatal signals aren't | |
1358 | really fatal on some systems. If that's true, then some changes | |
1359 | may be needed. */ | |
1360 | target_mourn_inferior (); | |
c906108c | 1361 | |
488f131b JB |
1362 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1363 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1364 | stop_stepping (ecs); | |
1365 | return; | |
c906108c | 1366 | |
488f131b JB |
1367 | /* The following are the only cases in which we keep going; |
1368 | the above cases end in a continue or goto. */ | |
1369 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1370 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 1371 | if (debug_infrun) |
8a9de0e4 | 1372 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
488f131b JB |
1373 | stop_signal = TARGET_SIGNAL_TRAP; |
1374 | pending_follow.kind = ecs->ws.kind; | |
1375 | ||
8e7d2c16 DJ |
1376 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1377 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1378 | |
488f131b | 1379 | stop_pc = read_pc (); |
675bf4cb | 1380 | |
00d4360e | 1381 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1382 | |
488f131b | 1383 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1384 | |
1385 | /* If no catchpoint triggered for this, then keep going. */ | |
1386 | if (ecs->random_signal) | |
1387 | { | |
1388 | stop_signal = TARGET_SIGNAL_0; | |
1389 | keep_going (ecs); | |
1390 | return; | |
1391 | } | |
488f131b JB |
1392 | goto process_event_stop_test; |
1393 | ||
1394 | case TARGET_WAITKIND_EXECD: | |
527159b7 | 1395 | if (debug_infrun) |
8a9de0e4 | 1396 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECED\n"); |
488f131b JB |
1397 | stop_signal = TARGET_SIGNAL_TRAP; |
1398 | ||
7d2830a3 | 1399 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
8fb3e588 AC |
1400 | target_wait function. Until then following vfork on HP/UX 10.20 |
1401 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1402 | /* Is this a target which reports multiple exec events per actual |
1403 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1404 | ignore all but the last one. Just resume the exec'r, and wait | |
1405 | for the next exec event. */ | |
1406 | if (inferior_ignoring_leading_exec_events) | |
1407 | { | |
1408 | inferior_ignoring_leading_exec_events--; | |
1409 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1410 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event. | |
1411 | parent_pid); | |
1412 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); | |
1413 | prepare_to_wait (ecs); | |
1414 | return; | |
1415 | } | |
1416 | inferior_ignoring_leading_exec_events = | |
1417 | target_reported_exec_events_per_exec_call () - 1; | |
1418 | ||
1419 | pending_follow.execd_pathname = | |
1420 | savestring (ecs->ws.value.execd_pathname, | |
1421 | strlen (ecs->ws.value.execd_pathname)); | |
1422 | ||
488f131b JB |
1423 | /* This causes the eventpoints and symbol table to be reset. Must |
1424 | do this now, before trying to determine whether to stop. */ | |
1425 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1426 | xfree (pending_follow.execd_pathname); | |
c906108c | 1427 | |
488f131b JB |
1428 | stop_pc = read_pc_pid (ecs->ptid); |
1429 | ecs->saved_inferior_ptid = inferior_ptid; | |
1430 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1431 | |
00d4360e | 1432 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1433 | |
488f131b JB |
1434 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1435 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 DJ |
1436 | |
1437 | /* If no catchpoint triggered for this, then keep going. */ | |
1438 | if (ecs->random_signal) | |
1439 | { | |
1440 | stop_signal = TARGET_SIGNAL_0; | |
1441 | keep_going (ecs); | |
1442 | return; | |
1443 | } | |
488f131b JB |
1444 | goto process_event_stop_test; |
1445 | ||
b4dc5ffa MK |
1446 | /* Be careful not to try to gather much state about a thread |
1447 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 1448 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 1449 | if (debug_infrun) |
8a9de0e4 | 1450 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
488f131b JB |
1451 | resume (0, TARGET_SIGNAL_0); |
1452 | prepare_to_wait (ecs); | |
1453 | return; | |
c906108c | 1454 | |
488f131b JB |
1455 | /* Before examining the threads further, step this thread to |
1456 | get it entirely out of the syscall. (We get notice of the | |
1457 | event when the thread is just on the verge of exiting a | |
1458 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 1459 | into user code.) */ |
488f131b | 1460 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 1461 | if (debug_infrun) |
8a9de0e4 | 1462 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
488f131b | 1463 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
488f131b JB |
1464 | prepare_to_wait (ecs); |
1465 | return; | |
c906108c | 1466 | |
488f131b | 1467 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 1468 | if (debug_infrun) |
8a9de0e4 | 1469 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
488f131b JB |
1470 | stop_signal = ecs->ws.value.sig; |
1471 | break; | |
c906108c | 1472 | |
488f131b JB |
1473 | /* We had an event in the inferior, but we are not interested |
1474 | in handling it at this level. The lower layers have already | |
8e7d2c16 | 1475 | done what needs to be done, if anything. |
8fb3e588 AC |
1476 | |
1477 | One of the possible circumstances for this is when the | |
1478 | inferior produces output for the console. The inferior has | |
1479 | not stopped, and we are ignoring the event. Another possible | |
1480 | circumstance is any event which the lower level knows will be | |
1481 | reported multiple times without an intervening resume. */ | |
488f131b | 1482 | case TARGET_WAITKIND_IGNORE: |
527159b7 | 1483 | if (debug_infrun) |
8a9de0e4 | 1484 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); |
8e7d2c16 | 1485 | prepare_to_wait (ecs); |
488f131b JB |
1486 | return; |
1487 | } | |
c906108c | 1488 | |
488f131b JB |
1489 | /* We may want to consider not doing a resume here in order to give |
1490 | the user a chance to play with the new thread. It might be good | |
1491 | to make that a user-settable option. */ | |
c906108c | 1492 | |
488f131b JB |
1493 | /* At this point, all threads are stopped (happens automatically in |
1494 | either the OS or the native code). Therefore we need to continue | |
1495 | all threads in order to make progress. */ | |
1496 | if (ecs->new_thread_event) | |
1497 | { | |
1498 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1499 | prepare_to_wait (ecs); | |
1500 | return; | |
1501 | } | |
c906108c | 1502 | |
488f131b JB |
1503 | stop_pc = read_pc_pid (ecs->ptid); |
1504 | ||
527159b7 | 1505 | if (debug_infrun) |
8a9de0e4 | 1506 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc)); |
527159b7 | 1507 | |
9f976b41 DJ |
1508 | if (stepping_past_singlestep_breakpoint) |
1509 | { | |
8fb3e588 AC |
1510 | gdb_assert (SOFTWARE_SINGLE_STEP_P () |
1511 | && singlestep_breakpoints_inserted_p); | |
9f976b41 DJ |
1512 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
1513 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1514 | ||
1515 | stepping_past_singlestep_breakpoint = 0; | |
1516 | ||
1517 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
1518 | breakpoint, or stopped for some other reason. It would be nice if |
1519 | we could tell, but we can't reliably. */ | |
9f976b41 | 1520 | if (stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 1521 | { |
527159b7 | 1522 | if (debug_infrun) |
8a9de0e4 | 1523 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
9f976b41 DJ |
1524 | /* Pull the single step breakpoints out of the target. */ |
1525 | SOFTWARE_SINGLE_STEP (0, 0); | |
1526 | singlestep_breakpoints_inserted_p = 0; | |
1527 | ||
1528 | ecs->random_signal = 0; | |
1529 | ||
1530 | ecs->ptid = saved_singlestep_ptid; | |
1531 | context_switch (ecs); | |
9a4105ab AC |
1532 | if (deprecated_context_hook) |
1533 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1534 | |
1535 | resume (1, TARGET_SIGNAL_0); | |
1536 | prepare_to_wait (ecs); | |
1537 | return; | |
1538 | } | |
1539 | } | |
1540 | ||
1541 | stepping_past_singlestep_breakpoint = 0; | |
1542 | ||
488f131b JB |
1543 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1544 | another thread. If so, then step that thread past the breakpoint, | |
1545 | and continue it. */ | |
1546 | ||
1547 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1548 | { | |
9f976b41 DJ |
1549 | int thread_hop_needed = 0; |
1550 | ||
f8d40ec8 JB |
1551 | /* Check if a regular breakpoint has been hit before checking |
1552 | for a potential single step breakpoint. Otherwise, GDB will | |
1553 | not see this breakpoint hit when stepping onto breakpoints. */ | |
4fa8626c | 1554 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
488f131b | 1555 | { |
c5aa993b | 1556 | ecs->random_signal = 0; |
4fa8626c | 1557 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1558 | thread_hop_needed = 1; |
1559 | } | |
1560 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1561 | { | |
1562 | ecs->random_signal = 0; | |
1563 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1564 | change when we go from single-threaded to multi-threaded. If | |
1565 | the singlestep_ptid is still in the list, assume that it is | |
1566 | really different from ecs->ptid. */ | |
1567 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1568 | && in_thread_list (singlestep_ptid)) | |
1569 | { | |
1570 | thread_hop_needed = 1; | |
1571 | stepping_past_singlestep_breakpoint = 1; | |
1572 | saved_singlestep_ptid = singlestep_ptid; | |
1573 | } | |
1574 | } | |
1575 | ||
1576 | if (thread_hop_needed) | |
8fb3e588 AC |
1577 | { |
1578 | int remove_status; | |
1579 | ||
527159b7 | 1580 | if (debug_infrun) |
8a9de0e4 | 1581 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 1582 | |
8fb3e588 AC |
1583 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1584 | Just continue. */ | |
1585 | ||
1586 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
488f131b | 1587 | { |
8fb3e588 AC |
1588 | /* Pull the single step breakpoints out of the target. */ |
1589 | SOFTWARE_SINGLE_STEP (0, 0); | |
1590 | singlestep_breakpoints_inserted_p = 0; | |
1591 | } | |
1592 | ||
1593 | remove_status = remove_breakpoints (); | |
1594 | /* Did we fail to remove breakpoints? If so, try | |
1595 | to set the PC past the bp. (There's at least | |
1596 | one situation in which we can fail to remove | |
1597 | the bp's: On HP-UX's that use ttrace, we can't | |
1598 | change the address space of a vforking child | |
1599 | process until the child exits (well, okay, not | |
1600 | then either :-) or execs. */ | |
1601 | if (remove_status != 0) | |
1602 | { | |
1603 | /* FIXME! This is obviously non-portable! */ | |
1604 | write_pc_pid (stop_pc + 4, ecs->ptid); | |
1605 | /* We need to restart all the threads now, | |
1606 | * unles we're running in scheduler-locked mode. | |
1607 | * Use currently_stepping to determine whether to | |
1608 | * step or continue. | |
1609 | */ | |
1610 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1611 | if (scheduler_mode == schedlock_on) | |
1612 | target_resume (ecs->ptid, | |
1613 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
488f131b | 1614 | else |
8fb3e588 AC |
1615 | target_resume (RESUME_ALL, |
1616 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1617 | prepare_to_wait (ecs); | |
1618 | return; | |
1619 | } | |
1620 | else | |
1621 | { /* Single step */ | |
1622 | breakpoints_inserted = 0; | |
1623 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1624 | context_switch (ecs); | |
1625 | ecs->waiton_ptid = ecs->ptid; | |
1626 | ecs->wp = &(ecs->ws); | |
1627 | ecs->another_trap = 1; | |
1628 | ||
1629 | ecs->infwait_state = infwait_thread_hop_state; | |
1630 | keep_going (ecs); | |
1631 | registers_changed (); | |
1632 | return; | |
1633 | } | |
488f131b | 1634 | } |
f8d40ec8 | 1635 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
1636 | { |
1637 | sw_single_step_trap_p = 1; | |
1638 | ecs->random_signal = 0; | |
1639 | } | |
488f131b JB |
1640 | } |
1641 | else | |
1642 | ecs->random_signal = 1; | |
c906108c | 1643 | |
488f131b | 1644 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1645 | so, then switch to that thread. */ |
1646 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1647 | { |
527159b7 | 1648 | if (debug_infrun) |
8a9de0e4 | 1649 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 1650 | |
488f131b | 1651 | context_switch (ecs); |
c5aa993b | 1652 | |
9a4105ab AC |
1653 | if (deprecated_context_hook) |
1654 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
c5aa993b | 1655 | |
488f131b JB |
1656 | flush_cached_frames (); |
1657 | } | |
c906108c | 1658 | |
488f131b JB |
1659 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1660 | { | |
1661 | /* Pull the single step breakpoints out of the target. */ | |
1662 | SOFTWARE_SINGLE_STEP (0, 0); | |
1663 | singlestep_breakpoints_inserted_p = 0; | |
1664 | } | |
c906108c | 1665 | |
488f131b JB |
1666 | /* It may not be necessary to disable the watchpoint to stop over |
1667 | it. For example, the PA can (with some kernel cooperation) | |
1668 | single step over a watchpoint without disabling the watchpoint. */ | |
1669 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1670 | { | |
527159b7 | 1671 | if (debug_infrun) |
8a9de0e4 | 1672 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
488f131b JB |
1673 | resume (1, 0); |
1674 | prepare_to_wait (ecs); | |
1675 | return; | |
1676 | } | |
c906108c | 1677 | |
488f131b JB |
1678 | /* It is far more common to need to disable a watchpoint to step |
1679 | the inferior over it. FIXME. What else might a debug | |
1680 | register or page protection watchpoint scheme need here? */ | |
1681 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1682 | { | |
1683 | /* At this point, we are stopped at an instruction which has | |
1684 | attempted to write to a piece of memory under control of | |
1685 | a watchpoint. The instruction hasn't actually executed | |
1686 | yet. If we were to evaluate the watchpoint expression | |
1687 | now, we would get the old value, and therefore no change | |
1688 | would seem to have occurred. | |
1689 | ||
1690 | In order to make watchpoints work `right', we really need | |
1691 | to complete the memory write, and then evaluate the | |
1692 | watchpoint expression. The following code does that by | |
1693 | removing the watchpoint (actually, all watchpoints and | |
1694 | breakpoints), single-stepping the target, re-inserting | |
1695 | watchpoints, and then falling through to let normal | |
1696 | single-step processing handle proceed. Since this | |
1697 | includes evaluating watchpoints, things will come to a | |
1698 | stop in the correct manner. */ | |
1699 | ||
527159b7 | 1700 | if (debug_infrun) |
8a9de0e4 | 1701 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
488f131b JB |
1702 | remove_breakpoints (); |
1703 | registers_changed (); | |
1704 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1705 | |
488f131b JB |
1706 | ecs->waiton_ptid = ecs->ptid; |
1707 | ecs->wp = &(ecs->ws); | |
1708 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1709 | prepare_to_wait (ecs); | |
1710 | return; | |
1711 | } | |
1712 | ||
1713 | /* It may be possible to simply continue after a watchpoint. */ | |
1714 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
00d4360e | 1715 | stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
488f131b JB |
1716 | |
1717 | ecs->stop_func_start = 0; | |
1718 | ecs->stop_func_end = 0; | |
1719 | ecs->stop_func_name = 0; | |
1720 | /* Don't care about return value; stop_func_start and stop_func_name | |
1721 | will both be 0 if it doesn't work. */ | |
1722 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1723 | &ecs->stop_func_start, &ecs->stop_func_end); | |
782263ab | 1724 | ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET; |
488f131b JB |
1725 | ecs->another_trap = 0; |
1726 | bpstat_clear (&stop_bpstat); | |
1727 | stop_step = 0; | |
1728 | stop_stack_dummy = 0; | |
1729 | stop_print_frame = 1; | |
1730 | ecs->random_signal = 0; | |
1731 | stopped_by_random_signal = 0; | |
1732 | breakpoints_failed = 0; | |
1733 | ||
3352ef37 AC |
1734 | if (stop_signal == TARGET_SIGNAL_TRAP |
1735 | && trap_expected | |
1736 | && gdbarch_single_step_through_delay_p (current_gdbarch) | |
1737 | && currently_stepping (ecs)) | |
1738 | { | |
1739 | /* We're trying to step of a breakpoint. Turns out that we're | |
1740 | also on an instruction that needs to be stepped multiple | |
1741 | times before it's been fully executing. E.g., architectures | |
1742 | with a delay slot. It needs to be stepped twice, once for | |
1743 | the instruction and once for the delay slot. */ | |
1744 | int step_through_delay | |
1745 | = gdbarch_single_step_through_delay (current_gdbarch, | |
1746 | get_current_frame ()); | |
527159b7 | 1747 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 1748 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
3352ef37 AC |
1749 | if (step_range_end == 0 && step_through_delay) |
1750 | { | |
1751 | /* The user issued a continue when stopped at a breakpoint. | |
1752 | Set up for another trap and get out of here. */ | |
1753 | ecs->another_trap = 1; | |
1754 | keep_going (ecs); | |
1755 | return; | |
1756 | } | |
1757 | else if (step_through_delay) | |
1758 | { | |
1759 | /* The user issued a step when stopped at a breakpoint. | |
1760 | Maybe we should stop, maybe we should not - the delay | |
1761 | slot *might* correspond to a line of source. In any | |
1762 | case, don't decide that here, just set ecs->another_trap, | |
1763 | making sure we single-step again before breakpoints are | |
1764 | re-inserted. */ | |
1765 | ecs->another_trap = 1; | |
1766 | } | |
1767 | } | |
1768 | ||
488f131b JB |
1769 | /* Look at the cause of the stop, and decide what to do. |
1770 | The alternatives are: | |
1771 | 1) break; to really stop and return to the debugger, | |
1772 | 2) drop through to start up again | |
1773 | (set ecs->another_trap to 1 to single step once) | |
1774 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1775 | will be made according to the signal handling tables. */ | |
1776 | ||
1777 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1778 | that have to do with the program's own actions. Note that |
1779 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1780 | on the operating system version. Here we detect when a SIGILL or | |
1781 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1782 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1783 | when we're trying to execute a breakpoint instruction on a | |
1784 | non-executable stack. This happens for call dummy breakpoints | |
1785 | for architectures like SPARC that place call dummies on the | |
1786 | stack. */ | |
488f131b JB |
1787 | |
1788 | if (stop_signal == TARGET_SIGNAL_TRAP | |
8fb3e588 AC |
1789 | || (breakpoints_inserted |
1790 | && (stop_signal == TARGET_SIGNAL_ILL | |
1791 | || stop_signal == TARGET_SIGNAL_SEGV | |
1792 | || stop_signal == TARGET_SIGNAL_EMT)) | |
1793 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1794 | { |
1795 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1796 | { | |
527159b7 | 1797 | if (debug_infrun) |
8a9de0e4 | 1798 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
1799 | stop_print_frame = 0; |
1800 | stop_stepping (ecs); | |
1801 | return; | |
1802 | } | |
c54cfec8 EZ |
1803 | |
1804 | /* This is originated from start_remote(), start_inferior() and | |
1805 | shared libraries hook functions. */ | |
c0236d92 | 1806 | if (stop_soon == STOP_QUIETLY) |
488f131b | 1807 | { |
527159b7 | 1808 | if (debug_infrun) |
8a9de0e4 | 1809 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
1810 | stop_stepping (ecs); |
1811 | return; | |
1812 | } | |
1813 | ||
c54cfec8 EZ |
1814 | /* This originates from attach_command(). We need to overwrite |
1815 | the stop_signal here, because some kernels don't ignore a | |
1816 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1817 | See more comments in inferior.h. */ | |
c0236d92 | 1818 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1819 | { |
1820 | stop_stepping (ecs); | |
1821 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1822 | stop_signal = TARGET_SIGNAL_0; | |
1823 | return; | |
1824 | } | |
1825 | ||
d303a6c7 AC |
1826 | /* Don't even think about breakpoints if just proceeded over a |
1827 | breakpoint. */ | |
1828 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) | |
527159b7 RC |
1829 | { |
1830 | if (debug_infrun) | |
8a9de0e4 | 1831 | fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n"); |
527159b7 RC |
1832 | bpstat_clear (&stop_bpstat); |
1833 | } | |
488f131b JB |
1834 | else |
1835 | { | |
1836 | /* See if there is a breakpoint at the current PC. */ | |
8fb3e588 | 1837 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
00d4360e | 1838 | stopped_by_watchpoint); |
488f131b | 1839 | |
488f131b JB |
1840 | /* Following in case break condition called a |
1841 | function. */ | |
1842 | stop_print_frame = 1; | |
1843 | } | |
1844 | ||
73dd234f | 1845 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
1846 | at one stage in the past included checks for an inferior |
1847 | function call's call dummy's return breakpoint. The original | |
1848 | comment, that went with the test, read: | |
73dd234f | 1849 | |
8fb3e588 AC |
1850 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
1851 | another signal besides SIGTRAP, so check here as well as | |
1852 | above.'' | |
73dd234f AC |
1853 | |
1854 | If someone ever tries to get get call dummys on a | |
1855 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
1856 | with something like a SIGSEGV), then those tests might need |
1857 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 1858 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
1859 | suspect that it won't be the case. |
1860 | ||
8fb3e588 AC |
1861 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
1862 | be necessary for call dummies on a non-executable stack on | |
1863 | SPARC. */ | |
73dd234f | 1864 | |
488f131b JB |
1865 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1866 | ecs->random_signal | |
1867 | = !(bpstat_explains_signal (stop_bpstat) | |
1868 | || trap_expected | |
488f131b | 1869 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
1870 | else |
1871 | { | |
73dd234f | 1872 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
1873 | if (!ecs->random_signal) |
1874 | stop_signal = TARGET_SIGNAL_TRAP; | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | /* When we reach this point, we've pretty much decided | |
1879 | that the reason for stopping must've been a random | |
1880 | (unexpected) signal. */ | |
1881 | ||
1882 | else | |
1883 | ecs->random_signal = 1; | |
488f131b | 1884 | |
04e68871 | 1885 | process_event_stop_test: |
488f131b JB |
1886 | /* For the program's own signals, act according to |
1887 | the signal handling tables. */ | |
1888 | ||
1889 | if (ecs->random_signal) | |
1890 | { | |
1891 | /* Signal not for debugging purposes. */ | |
1892 | int printed = 0; | |
1893 | ||
527159b7 | 1894 | if (debug_infrun) |
8a9de0e4 | 1895 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal); |
527159b7 | 1896 | |
488f131b JB |
1897 | stopped_by_random_signal = 1; |
1898 | ||
1899 | if (signal_print[stop_signal]) | |
1900 | { | |
1901 | printed = 1; | |
1902 | target_terminal_ours_for_output (); | |
1903 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
1904 | } | |
1905 | if (signal_stop[stop_signal]) | |
1906 | { | |
1907 | stop_stepping (ecs); | |
1908 | return; | |
1909 | } | |
1910 | /* If not going to stop, give terminal back | |
1911 | if we took it away. */ | |
1912 | else if (printed) | |
1913 | target_terminal_inferior (); | |
1914 | ||
1915 | /* Clear the signal if it should not be passed. */ | |
1916 | if (signal_program[stop_signal] == 0) | |
1917 | stop_signal = TARGET_SIGNAL_0; | |
1918 | ||
68f53502 AC |
1919 | if (prev_pc == read_pc () |
1920 | && !breakpoints_inserted | |
1921 | && breakpoint_here_p (read_pc ()) | |
1922 | && step_resume_breakpoint == NULL) | |
1923 | { | |
1924 | /* We were just starting a new sequence, attempting to | |
1925 | single-step off of a breakpoint and expecting a SIGTRAP. | |
1926 | Intead this signal arrives. This signal will take us out | |
1927 | of the stepping range so GDB needs to remember to, when | |
1928 | the signal handler returns, resume stepping off that | |
1929 | breakpoint. */ | |
1930 | /* To simplify things, "continue" is forced to use the same | |
1931 | code paths as single-step - set a breakpoint at the | |
1932 | signal return address and then, once hit, step off that | |
1933 | breakpoint. */ | |
44cbf7b5 | 1934 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
68f53502 AC |
1935 | ecs->step_after_step_resume_breakpoint = 1; |
1936 | } | |
1937 | else if (step_range_end != 0 | |
1938 | && stop_signal != TARGET_SIGNAL_0 | |
1939 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
1940 | && frame_id_eq (get_frame_id (get_current_frame ()), | |
1941 | step_frame_id)) | |
d303a6c7 AC |
1942 | { |
1943 | /* The inferior is about to take a signal that will take it | |
1944 | out of the single step range. Set a breakpoint at the | |
1945 | current PC (which is presumably where the signal handler | |
1946 | will eventually return) and then allow the inferior to | |
1947 | run free. | |
1948 | ||
1949 | Note that this is only needed for a signal delivered | |
1950 | while in the single-step range. Nested signals aren't a | |
1951 | problem as they eventually all return. */ | |
44cbf7b5 | 1952 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
d303a6c7 | 1953 | } |
488f131b JB |
1954 | keep_going (ecs); |
1955 | return; | |
1956 | } | |
1957 | ||
1958 | /* Handle cases caused by hitting a breakpoint. */ | |
1959 | { | |
1960 | CORE_ADDR jmp_buf_pc; | |
1961 | struct bpstat_what what; | |
1962 | ||
1963 | what = bpstat_what (stop_bpstat); | |
1964 | ||
1965 | if (what.call_dummy) | |
1966 | { | |
1967 | stop_stack_dummy = 1; | |
c5aa993b | 1968 | } |
c906108c | 1969 | |
488f131b | 1970 | switch (what.main_action) |
c5aa993b | 1971 | { |
488f131b JB |
1972 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
1973 | /* If we hit the breakpoint at longjmp, disable it for the | |
1974 | duration of this command. Then, install a temporary | |
1975 | breakpoint at the target of the jmp_buf. */ | |
527159b7 | 1976 | if (debug_infrun) |
8a9de0e4 | 1977 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_SET_LONGJMP_RESUME\n"); |
488f131b JB |
1978 | disable_longjmp_breakpoint (); |
1979 | remove_breakpoints (); | |
1980 | breakpoints_inserted = 0; | |
1981 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 1982 | { |
488f131b | 1983 | keep_going (ecs); |
104c1213 | 1984 | return; |
c5aa993b | 1985 | } |
488f131b JB |
1986 | |
1987 | /* Need to blow away step-resume breakpoint, as it | |
1988 | interferes with us */ | |
1989 | if (step_resume_breakpoint != NULL) | |
104c1213 | 1990 | { |
488f131b | 1991 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 1992 | } |
c906108c | 1993 | |
8fb3e588 | 1994 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
1995 | ecs->handling_longjmp = 1; /* FIXME */ |
1996 | keep_going (ecs); | |
1997 | return; | |
c906108c | 1998 | |
488f131b JB |
1999 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2000 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
527159b7 | 2001 | if (debug_infrun) |
8a9de0e4 | 2002 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_CLEAR_LONGJMP_RESUME\n"); |
488f131b JB |
2003 | remove_breakpoints (); |
2004 | breakpoints_inserted = 0; | |
488f131b JB |
2005 | disable_longjmp_breakpoint (); |
2006 | ecs->handling_longjmp = 0; /* FIXME */ | |
2007 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2008 | break; | |
2009 | /* else fallthrough */ | |
2010 | ||
2011 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 2012 | if (debug_infrun) |
8a9de0e4 | 2013 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_SINGLE\n"); |
488f131b | 2014 | if (breakpoints_inserted) |
c5aa993b | 2015 | { |
488f131b | 2016 | remove_breakpoints (); |
c5aa993b | 2017 | } |
488f131b JB |
2018 | breakpoints_inserted = 0; |
2019 | ecs->another_trap = 1; | |
2020 | /* Still need to check other stuff, at least the case | |
2021 | where we are stepping and step out of the right range. */ | |
2022 | break; | |
c906108c | 2023 | |
488f131b | 2024 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 2025 | if (debug_infrun) |
8a9de0e4 | 2026 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_STOP_NOISY\n"); |
488f131b | 2027 | stop_print_frame = 1; |
c906108c | 2028 | |
d303a6c7 AC |
2029 | /* We are about to nuke the step_resume_breakpointt via the |
2030 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2031 | |
488f131b JB |
2032 | stop_stepping (ecs); |
2033 | return; | |
c5aa993b | 2034 | |
488f131b | 2035 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 2036 | if (debug_infrun) |
8a9de0e4 | 2037 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_STOP_SILENT\n"); |
488f131b | 2038 | stop_print_frame = 0; |
c5aa993b | 2039 | |
d303a6c7 AC |
2040 | /* We are about to nuke the step_resume_breakpoin via the |
2041 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2042 | |
488f131b | 2043 | stop_stepping (ecs); |
e441088d | 2044 | return; |
c5aa993b | 2045 | |
488f131b JB |
2046 | case BPSTAT_WHAT_STEP_RESUME: |
2047 | /* This proably demands a more elegant solution, but, yeah | |
2048 | right... | |
c5aa993b | 2049 | |
488f131b JB |
2050 | This function's use of the simple variable |
2051 | step_resume_breakpoint doesn't seem to accomodate | |
2052 | simultaneously active step-resume bp's, although the | |
2053 | breakpoint list certainly can. | |
c5aa993b | 2054 | |
488f131b JB |
2055 | If we reach here and step_resume_breakpoint is already |
2056 | NULL, then apparently we have multiple active | |
2057 | step-resume bp's. We'll just delete the breakpoint we | |
2058 | stopped at, and carry on. | |
2059 | ||
2060 | Correction: what the code currently does is delete a | |
2061 | step-resume bp, but it makes no effort to ensure that | |
2062 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2063 | |
527159b7 | 2064 | if (debug_infrun) |
8a9de0e4 | 2065 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_STEP_RESUME\n"); |
527159b7 | 2066 | |
488f131b JB |
2067 | if (step_resume_breakpoint == NULL) |
2068 | { | |
2069 | step_resume_breakpoint = | |
2070 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2071 | } | |
2072 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
68f53502 AC |
2073 | if (ecs->step_after_step_resume_breakpoint) |
2074 | { | |
2075 | /* Back when the step-resume breakpoint was inserted, we | |
2076 | were trying to single-step off a breakpoint. Go back | |
2077 | to doing that. */ | |
2078 | ecs->step_after_step_resume_breakpoint = 0; | |
2079 | remove_breakpoints (); | |
2080 | breakpoints_inserted = 0; | |
2081 | ecs->another_trap = 1; | |
2082 | keep_going (ecs); | |
2083 | return; | |
2084 | } | |
488f131b JB |
2085 | break; |
2086 | ||
2087 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
527159b7 | 2088 | if (debug_infrun) |
8a9de0e4 | 2089 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_THROUGH_SIGTRAMP\n"); |
488f131b JB |
2090 | /* If were waiting for a trap, hitting the step_resume_break |
2091 | doesn't count as getting it. */ | |
2092 | if (trap_expected) | |
2093 | ecs->another_trap = 1; | |
2094 | break; | |
2095 | ||
2096 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2097 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2098 | #ifdef SOLIB_ADD | |
c906108c | 2099 | { |
527159b7 | 2100 | if (debug_infrun) |
8a9de0e4 | 2101 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_CHECK_SHLIBS\n"); |
488f131b JB |
2102 | /* Remove breakpoints, we eventually want to step over the |
2103 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2104 | breakpoint addresses via breakpoint_re_set. */ | |
2105 | if (breakpoints_inserted) | |
2106 | remove_breakpoints (); | |
c5aa993b | 2107 | breakpoints_inserted = 0; |
488f131b JB |
2108 | |
2109 | /* Check for any newly added shared libraries if we're | |
2110 | supposed to be adding them automatically. Switch | |
2111 | terminal for any messages produced by | |
2112 | breakpoint_re_set. */ | |
2113 | target_terminal_ours_for_output (); | |
aff6338a | 2114 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
2115 | stack's section table is kept up-to-date. Architectures, |
2116 | (e.g., PPC64), use the section table to perform | |
2117 | operations such as address => section name and hence | |
2118 | require the table to contain all sections (including | |
2119 | those found in shared libraries). */ | |
aff6338a | 2120 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
2121 | exec_ops to SOLIB_ADD. This is because current GDB is |
2122 | only tooled to propagate section_table changes out from | |
2123 | the "current_target" (see target_resize_to_sections), and | |
2124 | not up from the exec stratum. This, of course, isn't | |
2125 | right. "infrun.c" should only interact with the | |
2126 | exec/process stratum, instead relying on the target stack | |
2127 | to propagate relevant changes (stop, section table | |
2128 | changed, ...) up to other layers. */ | |
aff6338a | 2129 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
2130 | target_terminal_inferior (); |
2131 | ||
2132 | /* Try to reenable shared library breakpoints, additional | |
2133 | code segments in shared libraries might be mapped in now. */ | |
2134 | re_enable_breakpoints_in_shlibs (); | |
2135 | ||
2136 | /* If requested, stop when the dynamic linker notifies | |
2137 | gdb of events. This allows the user to get control | |
2138 | and place breakpoints in initializer routines for | |
2139 | dynamically loaded objects (among other things). */ | |
877522db | 2140 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2141 | { |
488f131b | 2142 | stop_stepping (ecs); |
d4f3574e SS |
2143 | return; |
2144 | } | |
c5aa993b | 2145 | |
488f131b JB |
2146 | /* If we stopped due to an explicit catchpoint, then the |
2147 | (see above) call to SOLIB_ADD pulled in any symbols | |
2148 | from a newly-loaded library, if appropriate. | |
2149 | ||
2150 | We do want the inferior to stop, but not where it is | |
2151 | now, which is in the dynamic linker callback. Rather, | |
2152 | we would like it stop in the user's program, just after | |
2153 | the call that caused this catchpoint to trigger. That | |
2154 | gives the user a more useful vantage from which to | |
2155 | examine their program's state. */ | |
8fb3e588 AC |
2156 | else if (what.main_action |
2157 | == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2158 | { |
488f131b JB |
2159 | /* ??rehrauer: If I could figure out how to get the |
2160 | right return PC from here, we could just set a temp | |
2161 | breakpoint and resume. I'm not sure we can without | |
2162 | cracking open the dld's shared libraries and sniffing | |
2163 | their unwind tables and text/data ranges, and that's | |
2164 | not a terribly portable notion. | |
2165 | ||
2166 | Until that time, we must step the inferior out of the | |
2167 | dld callback, and also out of the dld itself (and any | |
2168 | code or stubs in libdld.sl, such as "shl_load" and | |
2169 | friends) until we reach non-dld code. At that point, | |
2170 | we can stop stepping. */ | |
2171 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2172 | &ecs-> | |
2173 | stepping_through_solib_catchpoints); | |
2174 | ecs->stepping_through_solib_after_catch = 1; | |
2175 | ||
2176 | /* Be sure to lift all breakpoints, so the inferior does | |
2177 | actually step past this point... */ | |
2178 | ecs->another_trap = 1; | |
2179 | break; | |
c906108c | 2180 | } |
c5aa993b | 2181 | else |
c5aa993b | 2182 | { |
488f131b | 2183 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2184 | ecs->another_trap = 1; |
488f131b | 2185 | break; |
c5aa993b | 2186 | } |
488f131b JB |
2187 | } |
2188 | #endif | |
2189 | break; | |
c906108c | 2190 | |
488f131b JB |
2191 | case BPSTAT_WHAT_LAST: |
2192 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2193 | |
488f131b JB |
2194 | case BPSTAT_WHAT_KEEP_CHECKING: |
2195 | break; | |
2196 | } | |
2197 | } | |
c906108c | 2198 | |
488f131b JB |
2199 | /* We come here if we hit a breakpoint but should not |
2200 | stop for it. Possibly we also were stepping | |
2201 | and should stop for that. So fall through and | |
2202 | test for stepping. But, if not stepping, | |
2203 | do not stop. */ | |
c906108c | 2204 | |
9d1ff73f MS |
2205 | /* Are we stepping to get the inferior out of the dynamic linker's |
2206 | hook (and possibly the dld itself) after catching a shlib | |
2207 | event? */ | |
488f131b JB |
2208 | if (ecs->stepping_through_solib_after_catch) |
2209 | { | |
2210 | #if defined(SOLIB_ADD) | |
2211 | /* Have we reached our destination? If not, keep going. */ | |
2212 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2213 | { | |
527159b7 | 2214 | if (debug_infrun) |
8a9de0e4 | 2215 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
488f131b JB |
2216 | ecs->another_trap = 1; |
2217 | keep_going (ecs); | |
104c1213 | 2218 | return; |
488f131b JB |
2219 | } |
2220 | #endif | |
527159b7 | 2221 | if (debug_infrun) |
8a9de0e4 | 2222 | fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
488f131b JB |
2223 | /* Else, stop and report the catchpoint(s) whose triggering |
2224 | caused us to begin stepping. */ | |
2225 | ecs->stepping_through_solib_after_catch = 0; | |
2226 | bpstat_clear (&stop_bpstat); | |
2227 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2228 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2229 | stop_print_frame = 1; | |
2230 | stop_stepping (ecs); | |
2231 | return; | |
2232 | } | |
c906108c | 2233 | |
488f131b JB |
2234 | if (step_resume_breakpoint) |
2235 | { | |
527159b7 | 2236 | if (debug_infrun) |
8a9de0e4 | 2237 | fprintf_unfiltered (gdb_stdlog, "infrun: step-resume breakpoint\n"); |
527159b7 | 2238 | |
488f131b JB |
2239 | /* Having a step-resume breakpoint overrides anything |
2240 | else having to do with stepping commands until | |
2241 | that breakpoint is reached. */ | |
488f131b JB |
2242 | keep_going (ecs); |
2243 | return; | |
2244 | } | |
c5aa993b | 2245 | |
488f131b JB |
2246 | if (step_range_end == 0) |
2247 | { | |
527159b7 | 2248 | if (debug_infrun) |
8a9de0e4 | 2249 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 2250 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
2251 | keep_going (ecs); |
2252 | return; | |
2253 | } | |
c5aa993b | 2254 | |
488f131b | 2255 | /* If stepping through a line, keep going if still within it. |
c906108c | 2256 | |
488f131b JB |
2257 | Note that step_range_end is the address of the first instruction |
2258 | beyond the step range, and NOT the address of the last instruction | |
2259 | within it! */ | |
2260 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2261 | { | |
527159b7 | 2262 | if (debug_infrun) |
8a9de0e4 | 2263 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n", |
527159b7 RC |
2264 | paddr_nz (step_range_start), |
2265 | paddr_nz (step_range_end)); | |
488f131b JB |
2266 | keep_going (ecs); |
2267 | return; | |
2268 | } | |
c5aa993b | 2269 | |
488f131b | 2270 | /* We stepped out of the stepping range. */ |
c906108c | 2271 | |
488f131b JB |
2272 | /* If we are stepping at the source level and entered the runtime |
2273 | loader dynamic symbol resolution code, we keep on single stepping | |
2274 | until we exit the run time loader code and reach the callee's | |
2275 | address. */ | |
2276 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2277 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2278 | { | |
4c8c40e6 MK |
2279 | CORE_ADDR pc_after_resolver = |
2280 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2281 | |
527159b7 | 2282 | if (debug_infrun) |
8a9de0e4 | 2283 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
527159b7 | 2284 | |
488f131b JB |
2285 | if (pc_after_resolver) |
2286 | { | |
2287 | /* Set up a step-resume breakpoint at the address | |
2288 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2289 | struct symtab_and_line sr_sal; | |
fe39c653 | 2290 | init_sal (&sr_sal); |
488f131b JB |
2291 | sr_sal.pc = pc_after_resolver; |
2292 | ||
44cbf7b5 | 2293 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c5aa993b | 2294 | } |
c906108c | 2295 | |
488f131b JB |
2296 | keep_going (ecs); |
2297 | return; | |
2298 | } | |
c906108c | 2299 | |
42edda50 AC |
2300 | if (step_range_end != 1 |
2301 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2302 | || step_over_calls == STEP_OVER_ALL) | |
2303 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 2304 | { |
527159b7 | 2305 | if (debug_infrun) |
8a9de0e4 | 2306 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
42edda50 | 2307 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
2308 | a signal trampoline (either by a signal being delivered or by |
2309 | the signal handler returning). Just single-step until the | |
2310 | inferior leaves the trampoline (either by calling the handler | |
2311 | or returning). */ | |
488f131b JB |
2312 | keep_going (ecs); |
2313 | return; | |
2314 | } | |
c906108c | 2315 | |
8fb3e588 | 2316 | if (frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) |
488f131b JB |
2317 | { |
2318 | /* It's a subroutine call. */ | |
95918acb | 2319 | CORE_ADDR real_stop_pc; |
8fb3e588 | 2320 | |
527159b7 | 2321 | if (debug_infrun) |
8a9de0e4 | 2322 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 2323 | |
95918acb AC |
2324 | if ((step_over_calls == STEP_OVER_NONE) |
2325 | || ((step_range_end == 1) | |
2326 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2327 | { | |
2328 | /* I presume that step_over_calls is only 0 when we're | |
2329 | supposed to be stepping at the assembly language level | |
2330 | ("stepi"). Just stop. */ | |
2331 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
2332 | thought it was a subroutine call but it was not. Stop as | |
2333 | well. FENN */ | |
2334 | stop_step = 1; | |
2335 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2336 | stop_stepping (ecs); | |
2337 | return; | |
2338 | } | |
8fb3e588 | 2339 | |
8567c30f AC |
2340 | if (step_over_calls == STEP_OVER_ALL) |
2341 | { | |
2342 | /* We're doing a "next", set a breakpoint at callee's return | |
2343 | address (the address at which the caller will | |
2344 | resume). */ | |
44cbf7b5 | 2345 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
8567c30f AC |
2346 | keep_going (ecs); |
2347 | return; | |
2348 | } | |
a53c66de | 2349 | |
95918acb | 2350 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
2351 | calling routine and the real function), locate the real |
2352 | function. That's what tells us (a) whether we want to step | |
2353 | into it at all, and (b) what prologue we want to run to the | |
2354 | end of, if we do step into it. */ | |
95918acb AC |
2355 | real_stop_pc = skip_language_trampoline (stop_pc); |
2356 | if (real_stop_pc == 0) | |
2357 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2358 | if (real_stop_pc != 0) | |
2359 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 2360 | |
1b2bfbb9 RC |
2361 | if (IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start)) |
2362 | { | |
2363 | struct symtab_and_line sr_sal; | |
2364 | init_sal (&sr_sal); | |
2365 | sr_sal.pc = ecs->stop_func_start; | |
2366 | ||
44cbf7b5 | 2367 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
8fb3e588 AC |
2368 | keep_going (ecs); |
2369 | return; | |
1b2bfbb9 RC |
2370 | } |
2371 | ||
95918acb | 2372 | /* If we have line number information for the function we are |
8fb3e588 | 2373 | thinking of stepping into, step into it. |
95918acb | 2374 | |
8fb3e588 AC |
2375 | If there are several symtabs at that PC (e.g. with include |
2376 | files), just want to know whether *any* of them have line | |
2377 | numbers. find_pc_line handles this. */ | |
95918acb AC |
2378 | { |
2379 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 2380 | |
95918acb AC |
2381 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2382 | if (tmp_sal.line != 0) | |
2383 | { | |
2384 | step_into_function (ecs); | |
2385 | return; | |
2386 | } | |
2387 | } | |
2388 | ||
2389 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
2390 | set, we stop the step so that the user has a chance to switch |
2391 | in assembly mode. */ | |
95918acb AC |
2392 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
2393 | { | |
2394 | stop_step = 1; | |
2395 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2396 | stop_stepping (ecs); | |
2397 | return; | |
2398 | } | |
2399 | ||
2400 | /* Set a breakpoint at callee's return address (the address at | |
8fb3e588 | 2401 | which the caller will resume). */ |
44cbf7b5 | 2402 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
95918acb | 2403 | keep_going (ecs); |
488f131b | 2404 | return; |
488f131b | 2405 | } |
c906108c | 2406 | |
488f131b JB |
2407 | /* If we're in the return path from a shared library trampoline, |
2408 | we want to proceed through the trampoline when stepping. */ | |
2409 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2410 | { | |
488f131b | 2411 | /* Determine where this trampoline returns. */ |
5cf4d23a | 2412 | CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
c906108c | 2413 | |
527159b7 | 2414 | if (debug_infrun) |
8a9de0e4 | 2415 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
527159b7 | 2416 | |
488f131b | 2417 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2418 | if (real_stop_pc) |
488f131b JB |
2419 | { |
2420 | /* And put the step-breakpoint there and go until there. */ | |
2421 | struct symtab_and_line sr_sal; | |
2422 | ||
fe39c653 | 2423 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2424 | sr_sal.pc = real_stop_pc; |
488f131b | 2425 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
44cbf7b5 AC |
2426 | |
2427 | /* Do not specify what the fp should be when we stop since | |
2428 | on some machines the prologue is where the new fp value | |
2429 | is established. */ | |
2430 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
c906108c | 2431 | |
488f131b JB |
2432 | /* Restart without fiddling with the step ranges or |
2433 | other state. */ | |
2434 | keep_going (ecs); | |
2435 | return; | |
2436 | } | |
2437 | } | |
c906108c | 2438 | |
1b2bfbb9 RC |
2439 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
2440 | the trampoline processing logic, however, there are some trampolines | |
2441 | that have no names, so we should do trampoline handling first. */ | |
2442 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2443 | && ecs->stop_func_name == NULL) | |
2444 | { | |
527159b7 | 2445 | if (debug_infrun) |
8a9de0e4 | 2446 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
527159b7 | 2447 | |
1b2bfbb9 RC |
2448 | /* The inferior just stepped into, or returned to, an |
2449 | undebuggable function (where there is no symbol, not even a | |
2450 | minimal symbol, corresponding to the address where the | |
2451 | inferior stopped). Since we want to skip this kind of code, | |
2452 | we keep going until the inferior returns from this | |
2453 | function. */ | |
2454 | if (step_stop_if_no_debug) | |
2455 | { | |
2456 | /* If we have no line number and the step-stop-if-no-debug | |
2457 | is set, we stop the step so that the user has a chance to | |
2458 | switch in assembly mode. */ | |
2459 | stop_step = 1; | |
2460 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2461 | stop_stepping (ecs); | |
2462 | return; | |
2463 | } | |
2464 | else | |
2465 | { | |
2466 | /* Set a breakpoint at callee's return address (the address | |
2467 | at which the caller will resume). */ | |
44cbf7b5 | 2468 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
1b2bfbb9 RC |
2469 | keep_going (ecs); |
2470 | return; | |
2471 | } | |
2472 | } | |
2473 | ||
2474 | if (step_range_end == 1) | |
2475 | { | |
2476 | /* It is stepi or nexti. We always want to stop stepping after | |
2477 | one instruction. */ | |
527159b7 | 2478 | if (debug_infrun) |
8a9de0e4 | 2479 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
1b2bfbb9 RC |
2480 | stop_step = 1; |
2481 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2482 | stop_stepping (ecs); | |
2483 | return; | |
2484 | } | |
2485 | ||
2486 | ecs->sal = find_pc_line (stop_pc, 0); | |
2487 | ||
488f131b JB |
2488 | if (ecs->sal.line == 0) |
2489 | { | |
2490 | /* We have no line number information. That means to stop | |
2491 | stepping (does this always happen right after one instruction, | |
2492 | when we do "s" in a function with no line numbers, | |
2493 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 2494 | if (debug_infrun) |
8a9de0e4 | 2495 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
488f131b JB |
2496 | stop_step = 1; |
2497 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2498 | stop_stepping (ecs); | |
2499 | return; | |
2500 | } | |
c906108c | 2501 | |
488f131b JB |
2502 | if ((stop_pc == ecs->sal.pc) |
2503 | && (ecs->current_line != ecs->sal.line | |
2504 | || ecs->current_symtab != ecs->sal.symtab)) | |
2505 | { | |
2506 | /* We are at the start of a different line. So stop. Note that | |
2507 | we don't stop if we step into the middle of a different line. | |
2508 | That is said to make things like for (;;) statements work | |
2509 | better. */ | |
527159b7 | 2510 | if (debug_infrun) |
8a9de0e4 | 2511 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
488f131b JB |
2512 | stop_step = 1; |
2513 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2514 | stop_stepping (ecs); | |
2515 | return; | |
2516 | } | |
c906108c | 2517 | |
488f131b | 2518 | /* We aren't done stepping. |
c906108c | 2519 | |
488f131b JB |
2520 | Optimize by setting the stepping range to the line. |
2521 | (We might not be in the original line, but if we entered a | |
2522 | new line in mid-statement, we continue stepping. This makes | |
2523 | things like for(;;) statements work better.) */ | |
c906108c | 2524 | |
488f131b | 2525 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2526 | { |
488f131b JB |
2527 | /* If this is the last line of the function, don't keep stepping |
2528 | (it would probably step us out of the function). | |
2529 | This is particularly necessary for a one-line function, | |
2530 | in which after skipping the prologue we better stop even though | |
2531 | we will be in mid-line. */ | |
527159b7 | 2532 | if (debug_infrun) |
8a9de0e4 | 2533 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n"); |
488f131b JB |
2534 | stop_step = 1; |
2535 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2536 | stop_stepping (ecs); | |
2537 | return; | |
c5aa993b | 2538 | } |
488f131b JB |
2539 | step_range_start = ecs->sal.pc; |
2540 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2541 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2542 | ecs->current_line = ecs->sal.line; |
2543 | ecs->current_symtab = ecs->sal.symtab; | |
2544 | ||
aa0cd9c1 AC |
2545 | /* In the case where we just stepped out of a function into the |
2546 | middle of a line of the caller, continue stepping, but | |
2547 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2548 | #if 0 |
2549 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2550 | generous. It will trigger on things like a step into a frameless | |
2551 | stackless leaf function. I think the logic should instead look | |
2552 | at the unwound frame ID has that should give a more robust | |
2553 | indication of what happened. */ | |
8fb3e588 AC |
2554 | if (step - ID == current - ID) |
2555 | still stepping in same function; | |
2556 | else if (step - ID == unwind (current - ID)) | |
2557 | stepped into a function; | |
2558 | else | |
2559 | stepped out of a function; | |
2560 | /* Of course this assumes that the frame ID unwind code is robust | |
2561 | and we're willing to introduce frame unwind logic into this | |
2562 | function. Fortunately, those days are nearly upon us. */ | |
65815ea1 | 2563 | #endif |
488f131b | 2564 | { |
aa0cd9c1 AC |
2565 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2566 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2567 | step_frame_id = current_frame; | |
488f131b | 2568 | } |
c906108c | 2569 | |
527159b7 | 2570 | if (debug_infrun) |
8a9de0e4 | 2571 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 2572 | keep_going (ecs); |
104c1213 JM |
2573 | } |
2574 | ||
2575 | /* Are we in the middle of stepping? */ | |
2576 | ||
2577 | static int | |
2578 | currently_stepping (struct execution_control_state *ecs) | |
2579 | { | |
d303a6c7 | 2580 | return ((!ecs->handling_longjmp |
104c1213 JM |
2581 | && ((step_range_end && step_resume_breakpoint == NULL) |
2582 | || trap_expected)) | |
2583 | || ecs->stepping_through_solib_after_catch | |
2584 | || bpstat_should_step ()); | |
2585 | } | |
c906108c | 2586 | |
c2c6d25f JM |
2587 | /* Subroutine call with source code we should not step over. Do step |
2588 | to the first line of code in it. */ | |
2589 | ||
2590 | static void | |
2591 | step_into_function (struct execution_control_state *ecs) | |
2592 | { | |
2593 | struct symtab *s; | |
2594 | struct symtab_and_line sr_sal; | |
2595 | ||
2596 | s = find_pc_symtab (stop_pc); | |
2597 | if (s && s->language != language_asm) | |
2598 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2599 | ||
2600 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2601 | /* Use the step_resume_break to step until the end of the prologue, | |
2602 | even if that involves jumps (as it seems to on the vax under | |
2603 | 4.2). */ | |
2604 | /* If the prologue ends in the middle of a source line, continue to | |
2605 | the end of that source line (if it is still within the function). | |
2606 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2607 | if (ecs->sal.end |
2608 | && ecs->sal.pc != ecs->stop_func_start | |
2609 | && ecs->sal.end < ecs->stop_func_end) | |
2610 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2611 | |
2dbd5e30 KB |
2612 | /* Architectures which require breakpoint adjustment might not be able |
2613 | to place a breakpoint at the computed address. If so, the test | |
2614 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2615 | ecs->stop_func_start to an address at which a breakpoint may be | |
2616 | legitimately placed. | |
8fb3e588 | 2617 | |
2dbd5e30 KB |
2618 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
2619 | made, GDB will enter an infinite loop when stepping through | |
2620 | optimized code consisting of VLIW instructions which contain | |
2621 | subinstructions corresponding to different source lines. On | |
2622 | FR-V, it's not permitted to place a breakpoint on any but the | |
2623 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2624 | set, GDB will adjust the breakpoint address to the beginning of | |
2625 | the VLIW instruction. Thus, we need to make the corresponding | |
2626 | adjustment here when computing the stop address. */ | |
8fb3e588 | 2627 | |
2dbd5e30 KB |
2628 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
2629 | { | |
2630 | ecs->stop_func_start | |
2631 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
8fb3e588 | 2632 | ecs->stop_func_start); |
2dbd5e30 KB |
2633 | } |
2634 | ||
c2c6d25f JM |
2635 | if (ecs->stop_func_start == stop_pc) |
2636 | { | |
2637 | /* We are already there: stop now. */ | |
2638 | stop_step = 1; | |
488f131b | 2639 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2640 | stop_stepping (ecs); |
2641 | return; | |
2642 | } | |
2643 | else | |
2644 | { | |
2645 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2646 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2647 | sr_sal.pc = ecs->stop_func_start; |
2648 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
44cbf7b5 | 2649 | |
c2c6d25f | 2650 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
2651 | some machines the prologue is where the new fp value is |
2652 | established. */ | |
44cbf7b5 | 2653 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c2c6d25f JM |
2654 | |
2655 | /* And make sure stepping stops right away then. */ | |
2656 | step_range_end = step_range_start; | |
2657 | } | |
2658 | keep_going (ecs); | |
2659 | } | |
d4f3574e | 2660 | |
44cbf7b5 AC |
2661 | /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID. |
2662 | This is used to both functions and to skip over code. */ | |
2663 | ||
2664 | static void | |
2665 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
2666 | struct frame_id sr_id) | |
2667 | { | |
2668 | /* There should never be more than one step-resume breakpoint per | |
2669 | thread, so we should never be setting a new | |
2670 | step_resume_breakpoint when one is already active. */ | |
2671 | gdb_assert (step_resume_breakpoint == NULL); | |
2672 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, | |
2673 | bp_step_resume); | |
2674 | if (breakpoints_inserted) | |
2675 | insert_breakpoints (); | |
2676 | } | |
2677 | ||
7ce450bd AC |
2678 | /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used |
2679 | to skip a function (next, skip-no-debug) or signal. It's assumed | |
2680 | that the function/signal handler being skipped eventually returns | |
2681 | to the breakpoint inserted at RETURN_FRAME.pc. | |
2682 | ||
2683 | For the skip-function case, the function may have been reached by | |
2684 | either single stepping a call / return / signal-return instruction, | |
2685 | or by hitting a breakpoint. In all cases, the RETURN_FRAME belongs | |
2686 | to the skip-function's caller. | |
2687 | ||
2688 | For the signals case, this is called with the interrupted | |
2689 | function's frame. The signal handler, when it returns, will resume | |
2690 | the interrupted function at RETURN_FRAME.pc. */ | |
d303a6c7 AC |
2691 | |
2692 | static void | |
44cbf7b5 | 2693 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
2694 | { |
2695 | struct symtab_and_line sr_sal; | |
2696 | ||
d303a6c7 AC |
2697 | init_sal (&sr_sal); /* initialize to zeros */ |
2698 | ||
7ce450bd | 2699 | sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (return_frame)); |
d303a6c7 AC |
2700 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2701 | ||
44cbf7b5 | 2702 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
d303a6c7 AC |
2703 | } |
2704 | ||
104c1213 JM |
2705 | static void |
2706 | stop_stepping (struct execution_control_state *ecs) | |
2707 | { | |
527159b7 | 2708 | if (debug_infrun) |
8a9de0e4 | 2709 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 2710 | |
cd0fc7c3 SS |
2711 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2712 | ecs->wait_some_more = 0; | |
2713 | } | |
2714 | ||
d4f3574e SS |
2715 | /* This function handles various cases where we need to continue |
2716 | waiting for the inferior. */ | |
2717 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2718 | ||
2719 | static void | |
2720 | keep_going (struct execution_control_state *ecs) | |
2721 | { | |
d4f3574e | 2722 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2723 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 2724 | |
d4f3574e SS |
2725 | /* If we did not do break;, it means we should keep running the |
2726 | inferior and not return to debugger. */ | |
2727 | ||
2728 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2729 | { | |
2730 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2731 | the inferior, else we'd have done a break above) and we |
2732 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2733 | resume (currently_stepping (ecs), stop_signal); |
2734 | } | |
2735 | else | |
2736 | { | |
2737 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2738 | anyway (the user asked that this signal be passed to the |
2739 | child) | |
2740 | -- or -- | |
2741 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2742 | decided we should resume from it. | |
d4f3574e | 2743 | |
68f53502 | 2744 | We're going to run this baby now! */ |
d4f3574e | 2745 | |
68f53502 | 2746 | if (!breakpoints_inserted && !ecs->another_trap) |
d4f3574e SS |
2747 | { |
2748 | breakpoints_failed = insert_breakpoints (); | |
2749 | if (breakpoints_failed) | |
2750 | { | |
2751 | stop_stepping (ecs); | |
2752 | return; | |
2753 | } | |
2754 | breakpoints_inserted = 1; | |
2755 | } | |
2756 | ||
2757 | trap_expected = ecs->another_trap; | |
2758 | ||
2759 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2760 | specifies that such a signal should be delivered to the |
2761 | target program). | |
2762 | ||
2763 | Typically, this would occure when a user is debugging a | |
2764 | target monitor on a simulator: the target monitor sets a | |
2765 | breakpoint; the simulator encounters this break-point and | |
2766 | halts the simulation handing control to GDB; GDB, noteing | |
2767 | that the break-point isn't valid, returns control back to the | |
2768 | simulator; the simulator then delivers the hardware | |
2769 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2770 | ||
2771 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2772 | stop_signal = TARGET_SIGNAL_0; |
2773 | ||
d4f3574e SS |
2774 | |
2775 | resume (currently_stepping (ecs), stop_signal); | |
2776 | } | |
2777 | ||
488f131b | 2778 | prepare_to_wait (ecs); |
d4f3574e SS |
2779 | } |
2780 | ||
104c1213 JM |
2781 | /* This function normally comes after a resume, before |
2782 | handle_inferior_event exits. It takes care of any last bits of | |
2783 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2784 | |
104c1213 JM |
2785 | static void |
2786 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2787 | { |
527159b7 | 2788 | if (debug_infrun) |
8a9de0e4 | 2789 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 JM |
2790 | if (ecs->infwait_state == infwait_normal_state) |
2791 | { | |
2792 | overlay_cache_invalid = 1; | |
2793 | ||
2794 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2795 | target_wait because they can be loaded from the target while |
2796 | in target_wait. This makes remote debugging a bit more | |
2797 | efficient for those targets that provide critical registers | |
2798 | as part of their normal status mechanism. */ | |
104c1213 JM |
2799 | |
2800 | registers_changed (); | |
39f77062 | 2801 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2802 | ecs->wp = &(ecs->ws); |
2803 | } | |
2804 | /* This is the old end of the while loop. Let everybody know we | |
2805 | want to wait for the inferior some more and get called again | |
2806 | soon. */ | |
2807 | ecs->wait_some_more = 1; | |
c906108c | 2808 | } |
11cf8741 JM |
2809 | |
2810 | /* Print why the inferior has stopped. We always print something when | |
2811 | the inferior exits, or receives a signal. The rest of the cases are | |
2812 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2813 | there should be a call to this function from handle_inferior_event() | |
2814 | each time stop_stepping() is called.*/ | |
2815 | static void | |
2816 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2817 | { | |
2818 | switch (stop_reason) | |
2819 | { | |
2820 | case STOP_UNKNOWN: | |
2821 | /* We don't deal with these cases from handle_inferior_event() | |
2822 | yet. */ | |
2823 | break; | |
2824 | case END_STEPPING_RANGE: | |
2825 | /* We are done with a step/next/si/ni command. */ | |
2826 | /* For now print nothing. */ | |
fb40c209 | 2827 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2828 | operation for n > 1 */ |
fb40c209 | 2829 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2830 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2831 | ui_out_field_string (uiout, "reason", "end-stepping-range"); |
11cf8741 JM |
2832 | break; |
2833 | case BREAKPOINT_HIT: | |
2834 | /* We found a breakpoint. */ | |
2835 | /* For now print nothing. */ | |
2836 | break; | |
2837 | case SIGNAL_EXITED: | |
2838 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2839 | annotate_signalled (); |
9dc5e2a9 | 2840 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2841 | ui_out_field_string (uiout, "reason", "exited-signalled"); |
8b93c638 JM |
2842 | ui_out_text (uiout, "\nProgram terminated with signal "); |
2843 | annotate_signal_name (); | |
488f131b JB |
2844 | ui_out_field_string (uiout, "signal-name", |
2845 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2846 | annotate_signal_name_end (); |
2847 | ui_out_text (uiout, ", "); | |
2848 | annotate_signal_string (); | |
488f131b JB |
2849 | ui_out_field_string (uiout, "signal-meaning", |
2850 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2851 | annotate_signal_string_end (); |
2852 | ui_out_text (uiout, ".\n"); | |
2853 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
2854 | break; |
2855 | case EXITED: | |
2856 | /* The inferior program is finished. */ | |
8b93c638 JM |
2857 | annotate_exited (stop_info); |
2858 | if (stop_info) | |
2859 | { | |
9dc5e2a9 | 2860 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2861 | ui_out_field_string (uiout, "reason", "exited"); |
8b93c638 | 2862 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
2863 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
2864 | (unsigned int) stop_info); | |
8b93c638 JM |
2865 | ui_out_text (uiout, ".\n"); |
2866 | } | |
2867 | else | |
2868 | { | |
9dc5e2a9 | 2869 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2870 | ui_out_field_string (uiout, "reason", "exited-normally"); |
8b93c638 JM |
2871 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
2872 | } | |
11cf8741 JM |
2873 | break; |
2874 | case SIGNAL_RECEIVED: | |
2875 | /* Signal received. The signal table tells us to print about | |
2876 | it. */ | |
8b93c638 JM |
2877 | annotate_signal (); |
2878 | ui_out_text (uiout, "\nProgram received signal "); | |
2879 | annotate_signal_name (); | |
84c6c83c KS |
2880 | if (ui_out_is_mi_like_p (uiout)) |
2881 | ui_out_field_string (uiout, "reason", "signal-received"); | |
488f131b JB |
2882 | ui_out_field_string (uiout, "signal-name", |
2883 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2884 | annotate_signal_name_end (); |
2885 | ui_out_text (uiout, ", "); | |
2886 | annotate_signal_string (); | |
488f131b JB |
2887 | ui_out_field_string (uiout, "signal-meaning", |
2888 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2889 | annotate_signal_string_end (); |
2890 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
2891 | break; |
2892 | default: | |
8e65ff28 AC |
2893 | internal_error (__FILE__, __LINE__, |
2894 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
2895 | break; |
2896 | } | |
2897 | } | |
c906108c | 2898 | \f |
43ff13b4 | 2899 | |
c906108c SS |
2900 | /* Here to return control to GDB when the inferior stops for real. |
2901 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
2902 | ||
2903 | STOP_PRINT_FRAME nonzero means print the executing frame | |
2904 | (pc, function, args, file, line number and line text). | |
2905 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
2906 | attempting to insert breakpoints. */ | |
2907 | ||
2908 | void | |
96baa820 | 2909 | normal_stop (void) |
c906108c | 2910 | { |
73b65bb0 DJ |
2911 | struct target_waitstatus last; |
2912 | ptid_t last_ptid; | |
2913 | ||
2914 | get_last_target_status (&last_ptid, &last); | |
2915 | ||
c906108c SS |
2916 | /* As with the notification of thread events, we want to delay |
2917 | notifying the user that we've switched thread context until | |
2918 | the inferior actually stops. | |
2919 | ||
73b65bb0 DJ |
2920 | There's no point in saying anything if the inferior has exited. |
2921 | Note that SIGNALLED here means "exited with a signal", not | |
2922 | "received a signal". */ | |
488f131b | 2923 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
2924 | && target_has_execution |
2925 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
2926 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
2927 | { |
2928 | target_terminal_ours_for_output (); | |
c3f6f71d | 2929 | printf_filtered ("[Switching to %s]\n", |
39f77062 KB |
2930 | target_pid_or_tid_to_str (inferior_ptid)); |
2931 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 2932 | } |
c906108c | 2933 | |
4fa8626c | 2934 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
2935 | /* Make sure that the current_frame's pc is correct. This |
2936 | is a correction for setting up the frame info before doing | |
2937 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
2938 | if (target_has_execution) |
2939 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
2940 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
2941 | frame code to check for this and sort out any resultant mess. | |
2942 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 2943 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 2944 | |
c906108c SS |
2945 | if (target_has_execution && breakpoints_inserted) |
2946 | { | |
2947 | if (remove_breakpoints ()) | |
2948 | { | |
2949 | target_terminal_ours_for_output (); | |
2950 | printf_filtered ("Cannot remove breakpoints because "); | |
2951 | printf_filtered ("program is no longer writable.\n"); | |
2952 | printf_filtered ("It might be running in another process.\n"); | |
2953 | printf_filtered ("Further execution is probably impossible.\n"); | |
2954 | } | |
2955 | } | |
2956 | breakpoints_inserted = 0; | |
2957 | ||
2958 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
2959 | Delete any breakpoint that is to be deleted at the next stop. */ | |
2960 | ||
2961 | breakpoint_auto_delete (stop_bpstat); | |
2962 | ||
2963 | /* If an auto-display called a function and that got a signal, | |
2964 | delete that auto-display to avoid an infinite recursion. */ | |
2965 | ||
2966 | if (stopped_by_random_signal) | |
2967 | disable_current_display (); | |
2968 | ||
2969 | /* Don't print a message if in the middle of doing a "step n" | |
2970 | operation for n > 1 */ | |
2971 | if (step_multi && stop_step) | |
2972 | goto done; | |
2973 | ||
2974 | target_terminal_ours (); | |
2975 | ||
5913bcb0 AC |
2976 | /* Look up the hook_stop and run it (CLI internally handles problem |
2977 | of stop_command's pre-hook not existing). */ | |
2978 | if (stop_command) | |
2979 | catch_errors (hook_stop_stub, stop_command, | |
2980 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
2981 | |
2982 | if (!target_has_stack) | |
2983 | { | |
2984 | ||
2985 | goto done; | |
2986 | } | |
2987 | ||
2988 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
2989 | and current location is based on that. | |
2990 | Don't do this on return from a stack dummy routine, | |
2991 | or if the program has exited. */ | |
2992 | ||
2993 | if (!stop_stack_dummy) | |
2994 | { | |
0f7d239c | 2995 | select_frame (get_current_frame ()); |
c906108c SS |
2996 | |
2997 | /* Print current location without a level number, if | |
c5aa993b JM |
2998 | we have changed functions or hit a breakpoint. |
2999 | Print source line if we have one. | |
3000 | bpstat_print() contains the logic deciding in detail | |
3001 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3002 | |
6e7f8b9c | 3003 | if (stop_print_frame && deprecated_selected_frame) |
c906108c SS |
3004 | { |
3005 | int bpstat_ret; | |
3006 | int source_flag; | |
917317f4 | 3007 | int do_frame_printing = 1; |
c906108c SS |
3008 | |
3009 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3010 | switch (bpstat_ret) |
3011 | { | |
3012 | case PRINT_UNKNOWN: | |
aa0cd9c1 | 3013 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
3014 | (or should) carry around the function and does (or |
3015 | should) use that when doing a frame comparison. */ | |
917317f4 | 3016 | if (stop_step |
aa0cd9c1 AC |
3017 | && frame_id_eq (step_frame_id, |
3018 | get_frame_id (get_current_frame ())) | |
917317f4 | 3019 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3020 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3021 | else |
488f131b | 3022 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3023 | break; |
3024 | case PRINT_SRC_AND_LOC: | |
488f131b | 3025 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3026 | break; |
3027 | case PRINT_SRC_ONLY: | |
c5394b80 | 3028 | source_flag = SRC_LINE; |
917317f4 JM |
3029 | break; |
3030 | case PRINT_NOTHING: | |
488f131b | 3031 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3032 | do_frame_printing = 0; |
3033 | break; | |
3034 | default: | |
488f131b | 3035 | internal_error (__FILE__, __LINE__, "Unknown value."); |
917317f4 | 3036 | } |
fb40c209 | 3037 | /* For mi, have the same behavior every time we stop: |
488f131b | 3038 | print everything but the source line. */ |
9dc5e2a9 | 3039 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3040 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3041 | |
9dc5e2a9 | 3042 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3043 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3044 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3045 | /* The behavior of this routine with respect to the source |
3046 | flag is: | |
c5394b80 JM |
3047 | SRC_LINE: Print only source line |
3048 | LOCATION: Print only location | |
3049 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3050 | if (do_frame_printing) |
b04f3ab4 | 3051 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
3052 | |
3053 | /* Display the auto-display expressions. */ | |
3054 | do_displays (); | |
3055 | } | |
3056 | } | |
3057 | ||
3058 | /* Save the function value return registers, if we care. | |
3059 | We might be about to restore their previous contents. */ | |
3060 | if (proceed_to_finish) | |
72cec141 AC |
3061 | /* NB: The copy goes through to the target picking up the value of |
3062 | all the registers. */ | |
3063 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3064 | |
3065 | if (stop_stack_dummy) | |
3066 | { | |
dbe9fe58 AC |
3067 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3068 | ends with a setting of the current frame, so we can use that | |
3069 | next. */ | |
3070 | frame_pop (get_current_frame ()); | |
c906108c | 3071 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3072 | Can't rely on restore_inferior_status because that only gets |
3073 | called if we don't stop in the called function. */ | |
c906108c | 3074 | stop_pc = read_pc (); |
0f7d239c | 3075 | select_frame (get_current_frame ()); |
c906108c SS |
3076 | } |
3077 | ||
c906108c SS |
3078 | done: |
3079 | annotate_stopped (); | |
7a464420 | 3080 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3081 | } |
3082 | ||
3083 | static int | |
96baa820 | 3084 | hook_stop_stub (void *cmd) |
c906108c | 3085 | { |
5913bcb0 | 3086 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3087 | return (0); |
3088 | } | |
3089 | \f | |
c5aa993b | 3090 | int |
96baa820 | 3091 | signal_stop_state (int signo) |
c906108c SS |
3092 | { |
3093 | return signal_stop[signo]; | |
3094 | } | |
3095 | ||
c5aa993b | 3096 | int |
96baa820 | 3097 | signal_print_state (int signo) |
c906108c SS |
3098 | { |
3099 | return signal_print[signo]; | |
3100 | } | |
3101 | ||
c5aa993b | 3102 | int |
96baa820 | 3103 | signal_pass_state (int signo) |
c906108c SS |
3104 | { |
3105 | return signal_program[signo]; | |
3106 | } | |
3107 | ||
488f131b | 3108 | int |
7bda5e4a | 3109 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3110 | { |
3111 | int ret = signal_stop[signo]; | |
3112 | signal_stop[signo] = state; | |
3113 | return ret; | |
3114 | } | |
3115 | ||
488f131b | 3116 | int |
7bda5e4a | 3117 | signal_print_update (int signo, int state) |
d4f3574e SS |
3118 | { |
3119 | int ret = signal_print[signo]; | |
3120 | signal_print[signo] = state; | |
3121 | return ret; | |
3122 | } | |
3123 | ||
488f131b | 3124 | int |
7bda5e4a | 3125 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3126 | { |
3127 | int ret = signal_program[signo]; | |
3128 | signal_program[signo] = state; | |
3129 | return ret; | |
3130 | } | |
3131 | ||
c906108c | 3132 | static void |
96baa820 | 3133 | sig_print_header (void) |
c906108c SS |
3134 | { |
3135 | printf_filtered ("\ | |
3136 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3137 | } | |
3138 | ||
3139 | static void | |
96baa820 | 3140 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3141 | { |
3142 | char *name = target_signal_to_name (oursig); | |
3143 | int name_padding = 13 - strlen (name); | |
96baa820 | 3144 | |
c906108c SS |
3145 | if (name_padding <= 0) |
3146 | name_padding = 0; | |
3147 | ||
3148 | printf_filtered ("%s", name); | |
488f131b | 3149 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3150 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3151 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3152 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3153 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3154 | } | |
3155 | ||
3156 | /* Specify how various signals in the inferior should be handled. */ | |
3157 | ||
3158 | static void | |
96baa820 | 3159 | handle_command (char *args, int from_tty) |
c906108c SS |
3160 | { |
3161 | char **argv; | |
3162 | int digits, wordlen; | |
3163 | int sigfirst, signum, siglast; | |
3164 | enum target_signal oursig; | |
3165 | int allsigs; | |
3166 | int nsigs; | |
3167 | unsigned char *sigs; | |
3168 | struct cleanup *old_chain; | |
3169 | ||
3170 | if (args == NULL) | |
3171 | { | |
3172 | error_no_arg ("signal to handle"); | |
3173 | } | |
3174 | ||
3175 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3176 | ||
3177 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3178 | sigs = (unsigned char *) alloca (nsigs); | |
3179 | memset (sigs, 0, nsigs); | |
3180 | ||
3181 | /* Break the command line up into args. */ | |
3182 | ||
3183 | argv = buildargv (args); | |
3184 | if (argv == NULL) | |
3185 | { | |
3186 | nomem (0); | |
3187 | } | |
7a292a7a | 3188 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3189 | |
3190 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3191 | actions. Signal numbers and signal names may be interspersed with | |
3192 | actions, with the actions being performed for all signals cumulatively | |
3193 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3194 | ||
3195 | while (*argv != NULL) | |
3196 | { | |
3197 | wordlen = strlen (*argv); | |
3198 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3199 | {; | |
3200 | } | |
3201 | allsigs = 0; | |
3202 | sigfirst = siglast = -1; | |
3203 | ||
3204 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3205 | { | |
3206 | /* Apply action to all signals except those used by the | |
3207 | debugger. Silently skip those. */ | |
3208 | allsigs = 1; | |
3209 | sigfirst = 0; | |
3210 | siglast = nsigs - 1; | |
3211 | } | |
3212 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3213 | { | |
3214 | SET_SIGS (nsigs, sigs, signal_stop); | |
3215 | SET_SIGS (nsigs, sigs, signal_print); | |
3216 | } | |
3217 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3218 | { | |
3219 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3220 | } | |
3221 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3222 | { | |
3223 | SET_SIGS (nsigs, sigs, signal_print); | |
3224 | } | |
3225 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3226 | { | |
3227 | SET_SIGS (nsigs, sigs, signal_program); | |
3228 | } | |
3229 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3230 | { | |
3231 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3232 | } | |
3233 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3234 | { | |
3235 | SET_SIGS (nsigs, sigs, signal_program); | |
3236 | } | |
3237 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3238 | { | |
3239 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3240 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3241 | } | |
3242 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3243 | { | |
3244 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3245 | } | |
3246 | else if (digits > 0) | |
3247 | { | |
3248 | /* It is numeric. The numeric signal refers to our own | |
3249 | internal signal numbering from target.h, not to host/target | |
3250 | signal number. This is a feature; users really should be | |
3251 | using symbolic names anyway, and the common ones like | |
3252 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3253 | ||
3254 | sigfirst = siglast = (int) | |
3255 | target_signal_from_command (atoi (*argv)); | |
3256 | if ((*argv)[digits] == '-') | |
3257 | { | |
3258 | siglast = (int) | |
3259 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3260 | } | |
3261 | if (sigfirst > siglast) | |
3262 | { | |
3263 | /* Bet he didn't figure we'd think of this case... */ | |
3264 | signum = sigfirst; | |
3265 | sigfirst = siglast; | |
3266 | siglast = signum; | |
3267 | } | |
3268 | } | |
3269 | else | |
3270 | { | |
3271 | oursig = target_signal_from_name (*argv); | |
3272 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3273 | { | |
3274 | sigfirst = siglast = (int) oursig; | |
3275 | } | |
3276 | else | |
3277 | { | |
3278 | /* Not a number and not a recognized flag word => complain. */ | |
3279 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3280 | } | |
3281 | } | |
3282 | ||
3283 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3284 | which signals to apply actions to. */ |
c906108c SS |
3285 | |
3286 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3287 | { | |
3288 | switch ((enum target_signal) signum) | |
3289 | { | |
3290 | case TARGET_SIGNAL_TRAP: | |
3291 | case TARGET_SIGNAL_INT: | |
3292 | if (!allsigs && !sigs[signum]) | |
3293 | { | |
3294 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3295 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3296 | { |
3297 | sigs[signum] = 1; | |
3298 | } | |
3299 | else | |
3300 | { | |
3301 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3302 | gdb_flush (gdb_stdout); | |
3303 | } | |
3304 | } | |
3305 | break; | |
3306 | case TARGET_SIGNAL_0: | |
3307 | case TARGET_SIGNAL_DEFAULT: | |
3308 | case TARGET_SIGNAL_UNKNOWN: | |
3309 | /* Make sure that "all" doesn't print these. */ | |
3310 | break; | |
3311 | default: | |
3312 | sigs[signum] = 1; | |
3313 | break; | |
3314 | } | |
3315 | } | |
3316 | ||
3317 | argv++; | |
3318 | } | |
3319 | ||
39f77062 | 3320 | target_notice_signals (inferior_ptid); |
c906108c SS |
3321 | |
3322 | if (from_tty) | |
3323 | { | |
3324 | /* Show the results. */ | |
3325 | sig_print_header (); | |
3326 | for (signum = 0; signum < nsigs; signum++) | |
3327 | { | |
3328 | if (sigs[signum]) | |
3329 | { | |
3330 | sig_print_info (signum); | |
3331 | } | |
3332 | } | |
3333 | } | |
3334 | ||
3335 | do_cleanups (old_chain); | |
3336 | } | |
3337 | ||
3338 | static void | |
96baa820 | 3339 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3340 | { |
3341 | char **argv; | |
3342 | struct cleanup *old_chain; | |
3343 | ||
3344 | /* Break the command line up into args. */ | |
3345 | ||
3346 | argv = buildargv (args); | |
3347 | if (argv == NULL) | |
3348 | { | |
3349 | nomem (0); | |
3350 | } | |
7a292a7a | 3351 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3352 | if (argv[1] != (char *) NULL) |
3353 | { | |
3354 | char *argBuf; | |
3355 | int bufLen; | |
3356 | ||
3357 | bufLen = strlen (argv[0]) + 20; | |
3358 | argBuf = (char *) xmalloc (bufLen); | |
3359 | if (argBuf) | |
3360 | { | |
3361 | int validFlag = 1; | |
3362 | enum target_signal oursig; | |
3363 | ||
3364 | oursig = target_signal_from_name (argv[0]); | |
3365 | memset (argBuf, 0, bufLen); | |
3366 | if (strcmp (argv[1], "Q") == 0) | |
3367 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3368 | else | |
3369 | { | |
3370 | if (strcmp (argv[1], "s") == 0) | |
3371 | { | |
3372 | if (!signal_stop[oursig]) | |
3373 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3374 | else | |
3375 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3376 | } | |
3377 | else if (strcmp (argv[1], "i") == 0) | |
3378 | { | |
3379 | if (!signal_program[oursig]) | |
3380 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3381 | else | |
3382 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3383 | } | |
3384 | else if (strcmp (argv[1], "r") == 0) | |
3385 | { | |
3386 | if (!signal_print[oursig]) | |
3387 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3388 | else | |
3389 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3390 | } | |
3391 | else | |
3392 | validFlag = 0; | |
3393 | } | |
3394 | if (validFlag) | |
3395 | handle_command (argBuf, from_tty); | |
3396 | else | |
3397 | printf_filtered ("Invalid signal handling flag.\n"); | |
3398 | if (argBuf) | |
b8c9b27d | 3399 | xfree (argBuf); |
c906108c SS |
3400 | } |
3401 | } | |
3402 | do_cleanups (old_chain); | |
3403 | } | |
3404 | ||
3405 | /* Print current contents of the tables set by the handle command. | |
3406 | It is possible we should just be printing signals actually used | |
3407 | by the current target (but for things to work right when switching | |
3408 | targets, all signals should be in the signal tables). */ | |
3409 | ||
3410 | static void | |
96baa820 | 3411 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3412 | { |
3413 | enum target_signal oursig; | |
3414 | sig_print_header (); | |
3415 | ||
3416 | if (signum_exp) | |
3417 | { | |
3418 | /* First see if this is a symbol name. */ | |
3419 | oursig = target_signal_from_name (signum_exp); | |
3420 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3421 | { | |
3422 | /* No, try numeric. */ | |
3423 | oursig = | |
bb518678 | 3424 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3425 | } |
3426 | sig_print_info (oursig); | |
3427 | return; | |
3428 | } | |
3429 | ||
3430 | printf_filtered ("\n"); | |
3431 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3432 | for (oursig = TARGET_SIGNAL_FIRST; | |
3433 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3434 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3435 | { | |
3436 | QUIT; | |
3437 | ||
3438 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3439 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3440 | sig_print_info (oursig); |
3441 | } | |
3442 | ||
3443 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3444 | } | |
3445 | \f | |
7a292a7a SS |
3446 | struct inferior_status |
3447 | { | |
3448 | enum target_signal stop_signal; | |
3449 | CORE_ADDR stop_pc; | |
3450 | bpstat stop_bpstat; | |
3451 | int stop_step; | |
3452 | int stop_stack_dummy; | |
3453 | int stopped_by_random_signal; | |
3454 | int trap_expected; | |
3455 | CORE_ADDR step_range_start; | |
3456 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3457 | struct frame_id step_frame_id; |
5fbbeb29 | 3458 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3459 | CORE_ADDR step_resume_break_address; |
3460 | int stop_after_trap; | |
c0236d92 | 3461 | int stop_soon; |
72cec141 | 3462 | struct regcache *stop_registers; |
7a292a7a SS |
3463 | |
3464 | /* These are here because if call_function_by_hand has written some | |
3465 | registers and then decides to call error(), we better not have changed | |
3466 | any registers. */ | |
72cec141 | 3467 | struct regcache *registers; |
7a292a7a | 3468 | |
101dcfbe AC |
3469 | /* A frame unique identifier. */ |
3470 | struct frame_id selected_frame_id; | |
3471 | ||
7a292a7a SS |
3472 | int breakpoint_proceeded; |
3473 | int restore_stack_info; | |
3474 | int proceed_to_finish; | |
3475 | }; | |
3476 | ||
7a292a7a | 3477 | void |
96baa820 JM |
3478 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3479 | LONGEST val) | |
7a292a7a | 3480 | { |
3acba339 | 3481 | int size = register_size (current_gdbarch, regno); |
7a292a7a SS |
3482 | void *buf = alloca (size); |
3483 | store_signed_integer (buf, size, val); | |
0818c12a | 3484 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3485 | } |
3486 | ||
c906108c SS |
3487 | /* Save all of the information associated with the inferior<==>gdb |
3488 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3489 | (defined in inferior.h). */ | |
3490 | ||
7a292a7a | 3491 | struct inferior_status * |
96baa820 | 3492 | save_inferior_status (int restore_stack_info) |
c906108c | 3493 | { |
72cec141 | 3494 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3495 | |
c906108c SS |
3496 | inf_status->stop_signal = stop_signal; |
3497 | inf_status->stop_pc = stop_pc; | |
3498 | inf_status->stop_step = stop_step; | |
3499 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3500 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3501 | inf_status->trap_expected = trap_expected; | |
3502 | inf_status->step_range_start = step_range_start; | |
3503 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3504 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3505 | inf_status->step_over_calls = step_over_calls; |
3506 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3507 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3508 | /* Save original bpstat chain here; replace it with copy of chain. |
3509 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3510 | hand them back the original chain when restore_inferior_status is |
3511 | called. */ | |
c906108c SS |
3512 | inf_status->stop_bpstat = stop_bpstat; |
3513 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3514 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3515 | inf_status->restore_stack_info = restore_stack_info; | |
3516 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3517 | |
72cec141 | 3518 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3519 | |
72cec141 | 3520 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3521 | |
7a424e99 | 3522 | inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
7a292a7a | 3523 | return inf_status; |
c906108c SS |
3524 | } |
3525 | ||
c906108c | 3526 | static int |
96baa820 | 3527 | restore_selected_frame (void *args) |
c906108c | 3528 | { |
488f131b | 3529 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3530 | struct frame_info *frame; |
c906108c | 3531 | |
101dcfbe | 3532 | frame = frame_find_by_id (*fid); |
c906108c | 3533 | |
aa0cd9c1 AC |
3534 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3535 | selected frame. */ | |
101dcfbe | 3536 | if (frame == NULL) |
c906108c SS |
3537 | { |
3538 | warning ("Unable to restore previously selected frame.\n"); | |
3539 | return 0; | |
3540 | } | |
3541 | ||
0f7d239c | 3542 | select_frame (frame); |
c906108c SS |
3543 | |
3544 | return (1); | |
3545 | } | |
3546 | ||
3547 | void | |
96baa820 | 3548 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3549 | { |
3550 | stop_signal = inf_status->stop_signal; | |
3551 | stop_pc = inf_status->stop_pc; | |
3552 | stop_step = inf_status->stop_step; | |
3553 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3554 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3555 | trap_expected = inf_status->trap_expected; | |
3556 | step_range_start = inf_status->step_range_start; | |
3557 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3558 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3559 | step_over_calls = inf_status->step_over_calls; |
3560 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3561 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3562 | bpstat_clear (&stop_bpstat); |
3563 | stop_bpstat = inf_status->stop_bpstat; | |
3564 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3565 | proceed_to_finish = inf_status->proceed_to_finish; | |
3566 | ||
72cec141 AC |
3567 | /* FIXME: Is the restore of stop_registers always needed. */ |
3568 | regcache_xfree (stop_registers); | |
3569 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3570 | |
3571 | /* The inferior can be gone if the user types "print exit(0)" | |
3572 | (and perhaps other times). */ | |
3573 | if (target_has_execution) | |
72cec141 AC |
3574 | /* NB: The register write goes through to the target. */ |
3575 | regcache_cpy (current_regcache, inf_status->registers); | |
3576 | regcache_xfree (inf_status->registers); | |
c906108c | 3577 | |
c906108c SS |
3578 | /* FIXME: If we are being called after stopping in a function which |
3579 | is called from gdb, we should not be trying to restore the | |
3580 | selected frame; it just prints a spurious error message (The | |
3581 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3582 | clobbers the stack)). In fact, should we be restoring the | |
3583 | inferior status at all in that case? . */ | |
3584 | ||
3585 | if (target_has_stack && inf_status->restore_stack_info) | |
3586 | { | |
c906108c | 3587 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3588 | walking the stack might encounter a garbage pointer and |
3589 | error() trying to dereference it. */ | |
488f131b JB |
3590 | if (catch_errors |
3591 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3592 | "Unable to restore previously selected frame:\n", | |
3593 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3594 | /* Error in restoring the selected frame. Select the innermost |
3595 | frame. */ | |
0f7d239c | 3596 | select_frame (get_current_frame ()); |
c906108c SS |
3597 | |
3598 | } | |
c906108c | 3599 | |
72cec141 | 3600 | xfree (inf_status); |
7a292a7a | 3601 | } |
c906108c | 3602 | |
74b7792f AC |
3603 | static void |
3604 | do_restore_inferior_status_cleanup (void *sts) | |
3605 | { | |
3606 | restore_inferior_status (sts); | |
3607 | } | |
3608 | ||
3609 | struct cleanup * | |
3610 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3611 | { | |
3612 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3613 | } | |
3614 | ||
c906108c | 3615 | void |
96baa820 | 3616 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3617 | { |
3618 | /* See save_inferior_status for info on stop_bpstat. */ | |
3619 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3620 | regcache_xfree (inf_status->registers); |
3621 | regcache_xfree (inf_status->stop_registers); | |
3622 | xfree (inf_status); | |
7a292a7a SS |
3623 | } |
3624 | ||
47932f85 DJ |
3625 | int |
3626 | inferior_has_forked (int pid, int *child_pid) | |
3627 | { | |
3628 | struct target_waitstatus last; | |
3629 | ptid_t last_ptid; | |
3630 | ||
3631 | get_last_target_status (&last_ptid, &last); | |
3632 | ||
3633 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3634 | return 0; | |
3635 | ||
3636 | if (ptid_get_pid (last_ptid) != pid) | |
3637 | return 0; | |
3638 | ||
3639 | *child_pid = last.value.related_pid; | |
3640 | return 1; | |
3641 | } | |
3642 | ||
3643 | int | |
3644 | inferior_has_vforked (int pid, int *child_pid) | |
3645 | { | |
3646 | struct target_waitstatus last; | |
3647 | ptid_t last_ptid; | |
3648 | ||
3649 | get_last_target_status (&last_ptid, &last); | |
3650 | ||
3651 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3652 | return 0; | |
3653 | ||
3654 | if (ptid_get_pid (last_ptid) != pid) | |
3655 | return 0; | |
3656 | ||
3657 | *child_pid = last.value.related_pid; | |
3658 | return 1; | |
3659 | } | |
3660 | ||
3661 | int | |
3662 | inferior_has_execd (int pid, char **execd_pathname) | |
3663 | { | |
3664 | struct target_waitstatus last; | |
3665 | ptid_t last_ptid; | |
3666 | ||
3667 | get_last_target_status (&last_ptid, &last); | |
3668 | ||
3669 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3670 | return 0; | |
3671 | ||
3672 | if (ptid_get_pid (last_ptid) != pid) | |
3673 | return 0; | |
3674 | ||
3675 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3676 | return 1; | |
3677 | } | |
3678 | ||
ca6724c1 KB |
3679 | /* Oft used ptids */ |
3680 | ptid_t null_ptid; | |
3681 | ptid_t minus_one_ptid; | |
3682 | ||
3683 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3684 | |
ca6724c1 KB |
3685 | ptid_t |
3686 | ptid_build (int pid, long lwp, long tid) | |
3687 | { | |
3688 | ptid_t ptid; | |
3689 | ||
3690 | ptid.pid = pid; | |
3691 | ptid.lwp = lwp; | |
3692 | ptid.tid = tid; | |
3693 | return ptid; | |
3694 | } | |
3695 | ||
3696 | /* Create a ptid from just a pid. */ | |
3697 | ||
3698 | ptid_t | |
3699 | pid_to_ptid (int pid) | |
3700 | { | |
3701 | return ptid_build (pid, 0, 0); | |
3702 | } | |
3703 | ||
3704 | /* Fetch the pid (process id) component from a ptid. */ | |
3705 | ||
3706 | int | |
3707 | ptid_get_pid (ptid_t ptid) | |
3708 | { | |
3709 | return ptid.pid; | |
3710 | } | |
3711 | ||
3712 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3713 | ||
3714 | long | |
3715 | ptid_get_lwp (ptid_t ptid) | |
3716 | { | |
3717 | return ptid.lwp; | |
3718 | } | |
3719 | ||
3720 | /* Fetch the tid (thread id) component from a ptid. */ | |
3721 | ||
3722 | long | |
3723 | ptid_get_tid (ptid_t ptid) | |
3724 | { | |
3725 | return ptid.tid; | |
3726 | } | |
3727 | ||
3728 | /* ptid_equal() is used to test equality of two ptids. */ | |
3729 | ||
3730 | int | |
3731 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3732 | { | |
3733 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3734 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3735 | } |
3736 | ||
3737 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3738 | to restore the inferior_ptid value saved in a call to | |
3739 | save_inferior_ptid(). */ | |
ce696e05 KB |
3740 | |
3741 | static void | |
3742 | restore_inferior_ptid (void *arg) | |
3743 | { | |
3744 | ptid_t *saved_ptid_ptr = arg; | |
3745 | inferior_ptid = *saved_ptid_ptr; | |
3746 | xfree (arg); | |
3747 | } | |
3748 | ||
3749 | /* Save the value of inferior_ptid so that it may be restored by a | |
3750 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3751 | needed for later doing the cleanup. */ | |
3752 | ||
3753 | struct cleanup * | |
3754 | save_inferior_ptid (void) | |
3755 | { | |
3756 | ptid_t *saved_ptid_ptr; | |
3757 | ||
3758 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3759 | *saved_ptid_ptr = inferior_ptid; | |
3760 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3761 | } | |
c5aa993b | 3762 | \f |
488f131b | 3763 | |
7a292a7a | 3764 | static void |
96baa820 | 3765 | build_infrun (void) |
7a292a7a | 3766 | { |
72cec141 | 3767 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3768 | } |
c906108c | 3769 | |
c906108c | 3770 | void |
96baa820 | 3771 | _initialize_infrun (void) |
c906108c | 3772 | { |
52f0bd74 AC |
3773 | int i; |
3774 | int numsigs; | |
c906108c SS |
3775 | struct cmd_list_element *c; |
3776 | ||
046a4708 AC |
3777 | DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers); |
3778 | deprecated_register_gdbarch_swap (NULL, 0, build_infrun); | |
0f71a2f6 | 3779 | |
c906108c SS |
3780 | add_info ("signals", signals_info, |
3781 | "What debugger does when program gets various signals.\n\ | |
3782 | Specify a signal as argument to print info on that signal only."); | |
3783 | add_info_alias ("handle", "signals", 0); | |
3784 | ||
3785 | add_com ("handle", class_run, handle_command, | |
3786 | concat ("Specify how to handle a signal.\n\ | |
3787 | Args are signals and actions to apply to those signals.\n\ | |
3788 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3789 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3790 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3791 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3792 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
3793 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3794 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3795 | Print means print a message if this signal happens.\n\ | |
3796 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3797 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3798 | Pass and Stop may be combined.", NULL)); | |
3799 | if (xdb_commands) | |
3800 | { | |
3801 | add_com ("lz", class_info, signals_info, | |
3802 | "What debugger does when program gets various signals.\n\ | |
3803 | Specify a signal as argument to print info on that signal only."); | |
3804 | add_com ("z", class_run, xdb_handle_command, | |
3805 | concat ("Specify how to handle a signal.\n\ | |
3806 | Args are signals and actions to apply to those signals.\n\ | |
3807 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3808 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3809 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3810 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3811 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
c906108c SS |
3812 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3813 | nopass), \"Q\" (noprint)\n\ | |
3814 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3815 | Print means print a message if this signal happens.\n\ | |
3816 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3817 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3818 | Pass and Stop may be combined.", NULL)); | |
3819 | } | |
3820 | ||
3821 | if (!dbx_commands) | |
488f131b | 3822 | stop_command = |
9d1ff73f MS |
3823 | add_cmd ("stop", class_obscure, not_just_help_class_command, |
3824 | "There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c SS |
3825 | This allows you to set a list of commands to be run each time execution\n\ |
3826 | of the program stops.", &cmdlist); | |
3827 | ||
527159b7 | 3828 | add_set_cmd ("infrun", class_maintenance, var_zinteger, |
9d1ff73f | 3829 | &debug_infrun, "Set inferior debugging.\n\ |
527159b7 RC |
3830 | When non-zero, inferior specific debugging is enabled.", &setdebuglist); |
3831 | ||
c906108c | 3832 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 3833 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
3834 | signal_print = (unsigned char *) |
3835 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3836 | signal_program = (unsigned char *) | |
3837 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3838 | for (i = 0; i < numsigs; i++) | |
3839 | { | |
3840 | signal_stop[i] = 1; | |
3841 | signal_print[i] = 1; | |
3842 | signal_program[i] = 1; | |
3843 | } | |
3844 | ||
3845 | /* Signals caused by debugger's own actions | |
3846 | should not be given to the program afterwards. */ | |
3847 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
3848 | signal_program[TARGET_SIGNAL_INT] = 0; | |
3849 | ||
3850 | /* Signals that are not errors should not normally enter the debugger. */ | |
3851 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
3852 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
3853 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
3854 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
3855 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
3856 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
3857 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
3858 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
3859 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
3860 | signal_print[TARGET_SIGNAL_IO] = 0; | |
3861 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
3862 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
3863 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
3864 | signal_print[TARGET_SIGNAL_URG] = 0; | |
3865 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
3866 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
3867 | ||
cd0fc7c3 SS |
3868 | /* These signals are used internally by user-level thread |
3869 | implementations. (See signal(5) on Solaris.) Like the above | |
3870 | signals, a healthy program receives and handles them as part of | |
3871 | its normal operation. */ | |
3872 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
3873 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
3874 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
3875 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
3876 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
3877 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
3878 | ||
c906108c | 3879 | #ifdef SOLIB_ADD |
cb1a6d5f | 3880 | deprecated_add_show_from_set |
c906108c SS |
3881 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, |
3882 | (char *) &stop_on_solib_events, | |
3883 | "Set stopping for shared library events.\n\ | |
3884 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
3885 | notifies gdb of shared library events. The most common event of interest\n\ | |
9d1ff73f MS |
3886 | to the user would be loading/unloading of a new library.\n", |
3887 | &setlist), | |
3888 | &showlist); | |
c906108c SS |
3889 | #endif |
3890 | ||
3891 | c = add_set_enum_cmd ("follow-fork-mode", | |
3892 | class_run, | |
488f131b | 3893 | follow_fork_mode_kind_names, &follow_fork_mode_string, |
c906108c SS |
3894 | "Set debugger response to a program call of fork \ |
3895 | or vfork.\n\ | |
3896 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
3897 | parent - the original process is debugged after a fork\n\ | |
3898 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 3899 | The unfollowed process will continue to run.\n\ |
488f131b | 3900 | By default, the debugger will follow the parent process.", &setlist); |
cb1a6d5f | 3901 | deprecated_add_show_from_set (c, &showlist); |
c906108c | 3902 | |
9d1ff73f MS |
3903 | c = add_set_enum_cmd ("scheduler-locking", class_run, |
3904 | scheduler_enums, /* array of string names */ | |
1ed2a135 | 3905 | &scheduler_mode, /* current mode */ |
c906108c SS |
3906 | "Set mode for locking scheduler during execution.\n\ |
3907 | off == no locking (threads may preempt at any time)\n\ | |
3908 | on == full locking (no thread except the current thread may run)\n\ | |
3909 | step == scheduler locked during every single-step operation.\n\ | |
3910 | In this mode, no other thread may run during a step command.\n\ | |
9d1ff73f MS |
3911 | Other threads may run while stepping over a function call ('next').", |
3912 | &setlist); | |
c906108c | 3913 | |
9f60d481 | 3914 | set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */ |
cb1a6d5f | 3915 | deprecated_add_show_from_set (c, &showlist); |
5fbbeb29 CF |
3916 | |
3917 | c = add_set_cmd ("step-mode", class_run, | |
488f131b JB |
3918 | var_boolean, (char *) &step_stop_if_no_debug, |
3919 | "Set mode of the step operation. When set, doing a step over a\n\ | |
5fbbeb29 CF |
3920 | function without debug line information will stop at the first\n\ |
3921 | instruction of that function. Otherwise, the function is skipped and\n\ | |
488f131b | 3922 | the step command stops at a different source line.", &setlist); |
cb1a6d5f | 3923 | deprecated_add_show_from_set (c, &showlist); |
ca6724c1 KB |
3924 | |
3925 | /* ptid initializations */ | |
3926 | null_ptid = ptid_build (0, 0, 0); | |
3927 | minus_one_ptid = ptid_build (-1, 0, 0); | |
3928 | inferior_ptid = null_ptid; | |
3929 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 3930 | } |