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" | |
31 | #include "breakpoint.h" | |
03f2053f | 32 | #include "gdb_wait.h" |
c906108c SS |
33 | #include "gdbcore.h" |
34 | #include "gdbcmd.h" | |
210661e7 | 35 | #include "cli/cli-script.h" |
c906108c SS |
36 | #include "target.h" |
37 | #include "gdbthread.h" | |
38 | #include "annotate.h" | |
1adeb98a | 39 | #include "symfile.h" |
7a292a7a | 40 | #include "top.h" |
c906108c | 41 | #include <signal.h> |
2acceee2 | 42 | #include "inf-loop.h" |
4e052eda | 43 | #include "regcache.h" |
fd0407d6 | 44 | #include "value.h" |
06600e06 | 45 | #include "observer.h" |
f636b87d | 46 | #include "language.h" |
9f976b41 | 47 | #include "gdb_assert.h" |
c906108c SS |
48 | |
49 | /* Prototypes for local functions */ | |
50 | ||
96baa820 | 51 | static void signals_info (char *, int); |
c906108c | 52 | |
96baa820 | 53 | static void handle_command (char *, int); |
c906108c | 54 | |
96baa820 | 55 | static void sig_print_info (enum target_signal); |
c906108c | 56 | |
96baa820 | 57 | static void sig_print_header (void); |
c906108c | 58 | |
74b7792f | 59 | static void resume_cleanups (void *); |
c906108c | 60 | |
96baa820 | 61 | static int hook_stop_stub (void *); |
c906108c | 62 | |
96baa820 JM |
63 | static int restore_selected_frame (void *); |
64 | ||
65 | static void build_infrun (void); | |
66 | ||
4ef3f3be | 67 | static int follow_fork (void); |
96baa820 JM |
68 | |
69 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 70 | struct cmd_list_element *c); |
96baa820 | 71 | |
96baa820 JM |
72 | struct execution_control_state; |
73 | ||
74 | static int currently_stepping (struct execution_control_state *ecs); | |
75 | ||
76 | static void xdb_handle_command (char *args, int from_tty); | |
77 | ||
ea67f13b DJ |
78 | static int prepare_to_proceed (void); |
79 | ||
96baa820 | 80 | void _initialize_infrun (void); |
43ff13b4 | 81 | |
c906108c SS |
82 | int inferior_ignoring_startup_exec_events = 0; |
83 | int inferior_ignoring_leading_exec_events = 0; | |
84 | ||
5fbbeb29 CF |
85 | /* When set, stop the 'step' command if we enter a function which has |
86 | no line number information. The normal behavior is that we step | |
87 | over such function. */ | |
88 | int step_stop_if_no_debug = 0; | |
89 | ||
43ff13b4 | 90 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 91 | |
43ff13b4 JM |
92 | int sync_execution = 0; |
93 | ||
c906108c SS |
94 | /* wait_for_inferior and normal_stop use this to notify the user |
95 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
96 | running in. */ |
97 | ||
39f77062 | 98 | static ptid_t previous_inferior_ptid; |
7a292a7a SS |
99 | |
100 | /* This is true for configurations that may follow through execl() and | |
101 | similar functions. At present this is only true for HP-UX native. */ | |
102 | ||
103 | #ifndef MAY_FOLLOW_EXEC | |
104 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
105 | #endif |
106 | ||
7a292a7a SS |
107 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
108 | ||
527159b7 RC |
109 | static int debug_infrun = 0; |
110 | ||
d4f3574e SS |
111 | /* If the program uses ELF-style shared libraries, then calls to |
112 | functions in shared libraries go through stubs, which live in a | |
113 | table called the PLT (Procedure Linkage Table). The first time the | |
114 | function is called, the stub sends control to the dynamic linker, | |
115 | which looks up the function's real address, patches the stub so | |
116 | that future calls will go directly to the function, and then passes | |
117 | control to the function. | |
118 | ||
119 | If we are stepping at the source level, we don't want to see any of | |
120 | this --- we just want to skip over the stub and the dynamic linker. | |
121 | The simple approach is to single-step until control leaves the | |
122 | dynamic linker. | |
123 | ||
ca557f44 AC |
124 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
125 | dynamic linker calls functions in the shared C library, so you | |
126 | can't tell from the PC alone whether the dynamic linker is still | |
127 | running. In this case, we use a step-resume breakpoint to get us | |
128 | past the dynamic linker, as if we were using "next" to step over a | |
129 | function call. | |
d4f3574e SS |
130 | |
131 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
132 | linker code or not. Normally, this means we single-step. However, | |
133 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
134 | address where we can place a step-resume breakpoint to get past the | |
135 | linker's symbol resolution function. | |
136 | ||
137 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
138 | pretty portable way, by comparing the PC against the address ranges | |
139 | of the dynamic linker's sections. | |
140 | ||
141 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
142 | it depends on internal details of the dynamic linker. It's usually | |
143 | not too hard to figure out where to put a breakpoint, but it | |
144 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
145 | sanity checking. If it can't figure things out, returning zero and | |
146 | getting the (possibly confusing) stepping behavior is better than | |
147 | signalling an error, which will obscure the change in the | |
148 | inferior's state. */ | |
c906108c SS |
149 | |
150 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
151 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
152 | #endif | |
153 | ||
c906108c SS |
154 | /* This function returns TRUE if pc is the address of an instruction |
155 | that lies within the dynamic linker (such as the event hook, or the | |
156 | dld itself). | |
157 | ||
158 | This function must be used only when a dynamic linker event has | |
159 | been caught, and the inferior is being stepped out of the hook, or | |
160 | undefined results are guaranteed. */ | |
161 | ||
162 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
163 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
164 | #endif | |
165 | ||
c2c6d25f JM |
166 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
167 | can't remove it. Instead, we have to advance the PC to the next | |
168 | instruction. This macro should expand to a pointer to a function that | |
169 | does that, or zero if we have no such function. If we don't have a | |
170 | definition for it, we have to report an error. */ | |
488f131b | 171 | #ifndef SKIP_PERMANENT_BREAKPOINT |
c2c6d25f JM |
172 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) |
173 | static void | |
c2d11a7d | 174 | default_skip_permanent_breakpoint (void) |
c2c6d25f | 175 | { |
255e7dbf | 176 | error ("\ |
c2c6d25f JM |
177 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ |
178 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
255e7dbf | 179 | a command like `return' or `jump' to continue execution."); |
c2c6d25f JM |
180 | } |
181 | #endif | |
488f131b | 182 | |
c2c6d25f | 183 | |
7a292a7a SS |
184 | /* Convert the #defines into values. This is temporary until wfi control |
185 | flow is completely sorted out. */ | |
186 | ||
187 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
188 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
189 | #else | |
190 | #undef HAVE_STEPPABLE_WATCHPOINT | |
191 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
192 | #endif | |
193 | ||
692590c1 MS |
194 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
195 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
196 | #else | |
197 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
198 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
199 | #endif | |
200 | ||
c906108c SS |
201 | /* Tables of how to react to signals; the user sets them. */ |
202 | ||
203 | static unsigned char *signal_stop; | |
204 | static unsigned char *signal_print; | |
205 | static unsigned char *signal_program; | |
206 | ||
207 | #define SET_SIGS(nsigs,sigs,flags) \ | |
208 | do { \ | |
209 | int signum = (nsigs); \ | |
210 | while (signum-- > 0) \ | |
211 | if ((sigs)[signum]) \ | |
212 | (flags)[signum] = 1; \ | |
213 | } while (0) | |
214 | ||
215 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
216 | do { \ | |
217 | int signum = (nsigs); \ | |
218 | while (signum-- > 0) \ | |
219 | if ((sigs)[signum]) \ | |
220 | (flags)[signum] = 0; \ | |
221 | } while (0) | |
222 | ||
39f77062 KB |
223 | /* Value to pass to target_resume() to cause all threads to resume */ |
224 | ||
225 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
226 | |
227 | /* Command list pointer for the "stop" placeholder. */ | |
228 | ||
229 | static struct cmd_list_element *stop_command; | |
230 | ||
231 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
232 | ||
233 | static int breakpoints_inserted; | |
234 | ||
235 | /* Function inferior was in as of last step command. */ | |
236 | ||
237 | static struct symbol *step_start_function; | |
238 | ||
239 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
240 | ||
241 | static int trap_expected; | |
242 | ||
243 | #ifdef SOLIB_ADD | |
244 | /* Nonzero if we want to give control to the user when we're notified | |
245 | of shared library events by the dynamic linker. */ | |
246 | static int stop_on_solib_events; | |
247 | #endif | |
248 | ||
c906108c SS |
249 | /* Nonzero means expecting a trace trap |
250 | and should stop the inferior and return silently when it happens. */ | |
251 | ||
252 | int stop_after_trap; | |
253 | ||
254 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
255 | It is used after attach, due to attaching to a process; | |
256 | when running in the shell before the child program has been exec'd; | |
257 | and when running some kinds of remote stuff (FIXME?). */ | |
258 | ||
c0236d92 | 259 | enum stop_kind stop_soon; |
c906108c SS |
260 | |
261 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
262 | situation when stop_registers should be saved. */ | |
263 | ||
264 | int proceed_to_finish; | |
265 | ||
266 | /* Save register contents here when about to pop a stack dummy frame, | |
267 | if-and-only-if proceed_to_finish is set. | |
268 | Thus this contains the return value from the called function (assuming | |
269 | values are returned in a register). */ | |
270 | ||
72cec141 | 271 | struct regcache *stop_registers; |
c906108c SS |
272 | |
273 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
274 | ||
275 | static int breakpoints_failed; | |
276 | ||
277 | /* Nonzero after stop if current stack frame should be printed. */ | |
278 | ||
279 | static int stop_print_frame; | |
280 | ||
281 | static struct breakpoint *step_resume_breakpoint = NULL; | |
c906108c SS |
282 | |
283 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
284 | interactions with an inferior that is running a kernel function | |
285 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
286 | may have a need to know when the inferior is in a syscall. This | |
287 | is a count of the number of inferior threads which are known to | |
288 | currently be running in a syscall. */ | |
289 | static int number_of_threads_in_syscalls; | |
290 | ||
e02bc4cc | 291 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
292 | returned by target_wait()/deprecated_target_wait_hook(). This |
293 | information is returned by get_last_target_status(). */ | |
39f77062 | 294 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
295 | static struct target_waitstatus target_last_waitstatus; |
296 | ||
c906108c SS |
297 | /* This is used to remember when a fork, vfork or exec event |
298 | was caught by a catchpoint, and thus the event is to be | |
299 | followed at the next resume of the inferior, and not | |
300 | immediately. */ | |
301 | static struct | |
488f131b JB |
302 | { |
303 | enum target_waitkind kind; | |
304 | struct | |
c906108c | 305 | { |
488f131b | 306 | int parent_pid; |
488f131b | 307 | int child_pid; |
c906108c | 308 | } |
488f131b JB |
309 | fork_event; |
310 | char *execd_pathname; | |
311 | } | |
c906108c SS |
312 | pending_follow; |
313 | ||
53904c9e AC |
314 | static const char follow_fork_mode_child[] = "child"; |
315 | static const char follow_fork_mode_parent[] = "parent"; | |
316 | ||
488f131b | 317 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
318 | follow_fork_mode_child, |
319 | follow_fork_mode_parent, | |
320 | NULL | |
ef346e04 | 321 | }; |
c906108c | 322 | |
53904c9e | 323 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
c906108c SS |
324 | \f |
325 | ||
6604731b | 326 | static int |
4ef3f3be | 327 | follow_fork (void) |
c906108c | 328 | { |
ea1dd7bc | 329 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
c906108c | 330 | |
6604731b | 331 | return target_follow_fork (follow_child); |
c906108c SS |
332 | } |
333 | ||
6604731b DJ |
334 | void |
335 | follow_inferior_reset_breakpoints (void) | |
c906108c | 336 | { |
6604731b DJ |
337 | /* Was there a step_resume breakpoint? (There was if the user |
338 | did a "next" at the fork() call.) If so, explicitly reset its | |
339 | thread number. | |
340 | ||
341 | step_resumes are a form of bp that are made to be per-thread. | |
342 | Since we created the step_resume bp when the parent process | |
343 | was being debugged, and now are switching to the child process, | |
344 | from the breakpoint package's viewpoint, that's a switch of | |
345 | "threads". We must update the bp's notion of which thread | |
346 | it is for, or it'll be ignored when it triggers. */ | |
347 | ||
348 | if (step_resume_breakpoint) | |
349 | breakpoint_re_set_thread (step_resume_breakpoint); | |
350 | ||
351 | /* Reinsert all breakpoints in the child. The user may have set | |
352 | breakpoints after catching the fork, in which case those | |
353 | were never set in the child, but only in the parent. This makes | |
354 | sure the inserted breakpoints match the breakpoint list. */ | |
355 | ||
356 | breakpoint_re_set (); | |
357 | insert_breakpoints (); | |
c906108c | 358 | } |
c906108c | 359 | |
1adeb98a FN |
360 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
361 | ||
c906108c | 362 | static void |
96baa820 | 363 | follow_exec (int pid, char *execd_pathname) |
c906108c | 364 | { |
c906108c | 365 | int saved_pid = pid; |
7a292a7a SS |
366 | struct target_ops *tgt; |
367 | ||
368 | if (!may_follow_exec) | |
369 | return; | |
c906108c | 370 | |
c906108c SS |
371 | /* This is an exec event that we actually wish to pay attention to. |
372 | Refresh our symbol table to the newly exec'd program, remove any | |
373 | momentary bp's, etc. | |
374 | ||
375 | If there are breakpoints, they aren't really inserted now, | |
376 | since the exec() transformed our inferior into a fresh set | |
377 | of instructions. | |
378 | ||
379 | We want to preserve symbolic breakpoints on the list, since | |
380 | we have hopes that they can be reset after the new a.out's | |
381 | symbol table is read. | |
382 | ||
383 | However, any "raw" breakpoints must be removed from the list | |
384 | (e.g., the solib bp's), since their address is probably invalid | |
385 | now. | |
386 | ||
387 | And, we DON'T want to call delete_breakpoints() here, since | |
388 | that may write the bp's "shadow contents" (the instruction | |
389 | value that was overwritten witha TRAP instruction). Since | |
390 | we now have a new a.out, those shadow contents aren't valid. */ | |
391 | update_breakpoints_after_exec (); | |
392 | ||
393 | /* If there was one, it's gone now. We cannot truly step-to-next | |
394 | statement through an exec(). */ | |
395 | step_resume_breakpoint = NULL; | |
396 | step_range_start = 0; | |
397 | step_range_end = 0; | |
398 | ||
c906108c SS |
399 | /* What is this a.out's name? */ |
400 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
401 | ||
402 | /* We've followed the inferior through an exec. Therefore, the | |
403 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
404 | |
405 | /* First collect the run target in effect. */ | |
406 | tgt = find_run_target (); | |
407 | /* If we can't find one, things are in a very strange state... */ | |
408 | if (tgt == NULL) | |
409 | error ("Could find run target to save before following exec"); | |
410 | ||
c906108c SS |
411 | gdb_flush (gdb_stdout); |
412 | target_mourn_inferior (); | |
39f77062 | 413 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 414 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 415 | push_target (tgt); |
c906108c SS |
416 | |
417 | /* That a.out is now the one to use. */ | |
418 | exec_file_attach (execd_pathname, 0); | |
419 | ||
420 | /* And also is where symbols can be found. */ | |
1adeb98a | 421 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
422 | |
423 | /* Reset the shared library package. This ensures that we get | |
424 | a shlib event when the child reaches "_start", at which point | |
425 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 426 | #if defined(SOLIB_RESTART) |
c906108c | 427 | SOLIB_RESTART (); |
7a292a7a SS |
428 | #endif |
429 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 430 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
7a292a7a | 431 | #endif |
c906108c SS |
432 | |
433 | /* Reinsert all breakpoints. (Those which were symbolic have | |
434 | been reset to the proper address in the new a.out, thanks | |
435 | to symbol_file_command...) */ | |
436 | insert_breakpoints (); | |
437 | ||
438 | /* The next resume of this inferior should bring it to the shlib | |
439 | startup breakpoints. (If the user had also set bp's on | |
440 | "main" from the old (parent) process, then they'll auto- | |
441 | matically get reset there in the new process.) */ | |
c906108c SS |
442 | } |
443 | ||
444 | /* Non-zero if we just simulating a single-step. This is needed | |
445 | because we cannot remove the breakpoints in the inferior process | |
446 | until after the `wait' in `wait_for_inferior'. */ | |
447 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
448 | |
449 | /* The thread we inserted single-step breakpoints for. */ | |
450 | static ptid_t singlestep_ptid; | |
451 | ||
452 | /* If another thread hit the singlestep breakpoint, we save the original | |
453 | thread here so that we can resume single-stepping it later. */ | |
454 | static ptid_t saved_singlestep_ptid; | |
455 | static int stepping_past_singlestep_breakpoint; | |
c906108c SS |
456 | \f |
457 | ||
458 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 459 | static void |
74b7792f | 460 | resume_cleanups (void *ignore) |
c906108c SS |
461 | { |
462 | normal_stop (); | |
463 | } | |
464 | ||
53904c9e AC |
465 | static const char schedlock_off[] = "off"; |
466 | static const char schedlock_on[] = "on"; | |
467 | static const char schedlock_step[] = "step"; | |
468 | static const char *scheduler_mode = schedlock_off; | |
488f131b | 469 | static const char *scheduler_enums[] = { |
ef346e04 AC |
470 | schedlock_off, |
471 | schedlock_on, | |
472 | schedlock_step, | |
473 | NULL | |
474 | }; | |
c906108c SS |
475 | |
476 | static void | |
96baa820 | 477 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 478 | { |
cb1a6d5f AC |
479 | /* NOTE: cagney/2002-03-17: The deprecated_add_show_from_set() |
480 | function clones the set command passed as a parameter. The clone | |
481 | operation will include (BUG?) any ``set'' command callback, if | |
482 | present. Commands like ``info set'' call all the ``show'' | |
483 | command callbacks. Unfortunately, for ``show'' commands cloned | |
484 | from ``set'', this includes callbacks belonging to ``set'' | |
485 | commands. Making this worse, this only occures if | |
486 | deprecated_add_show_from_set() is called after add_cmd_sfunc() | |
487 | (BUG?). */ | |
1868c04e | 488 | if (cmd_type (c) == set_cmd) |
c906108c SS |
489 | if (!target_can_lock_scheduler) |
490 | { | |
491 | scheduler_mode = schedlock_off; | |
488f131b | 492 | error ("Target '%s' cannot support this command.", target_shortname); |
c906108c SS |
493 | } |
494 | } | |
495 | ||
496 | ||
497 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
498 | wants to interrupt some lengthy single-stepping operation | |
499 | (for child processes, the SIGINT goes to the inferior, and so | |
500 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
501 | other targets, that's not true). | |
502 | ||
503 | STEP nonzero if we should step (zero to continue instead). | |
504 | SIG is the signal to give the inferior (zero for none). */ | |
505 | void | |
96baa820 | 506 | resume (int step, enum target_signal sig) |
c906108c SS |
507 | { |
508 | int should_resume = 1; | |
74b7792f | 509 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
510 | QUIT; |
511 | ||
527159b7 RC |
512 | if (debug_infrun) |
513 | printf_unfiltered ("infrun: resume (step=%d, signal=%d)\n", step, sig); | |
514 | ||
ef5cf84e MS |
515 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
516 | ||
c906108c | 517 | |
692590c1 MS |
518 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
519 | over an instruction that causes a page fault without triggering | |
520 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
521 | stop, because the hardware watchpoint is not triggered, but it forgets | |
522 | the step request and continues the program normally. | |
523 | Work around the problem by removing hardware watchpoints if a step is | |
524 | requested, GDB will check for a hardware watchpoint trigger after the | |
525 | step anyway. */ | |
526 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
527 | remove_hw_watchpoints (); | |
488f131b | 528 | |
692590c1 | 529 | |
c2c6d25f JM |
530 | /* Normally, by the time we reach `resume', the breakpoints are either |
531 | removed or inserted, as appropriate. The exception is if we're sitting | |
532 | at a permanent breakpoint; we need to step over it, but permanent | |
533 | breakpoints can't be removed. So we have to test for it here. */ | |
534 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
535 | SKIP_PERMANENT_BREAKPOINT (); | |
536 | ||
b0ed3589 | 537 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
538 | { |
539 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 540 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
541 | /* ...and don't ask hardware to do it. */ |
542 | step = 0; | |
543 | /* and do not pull these breakpoints until after a `wait' in | |
544 | `wait_for_inferior' */ | |
545 | singlestep_breakpoints_inserted_p = 1; | |
9f976b41 | 546 | singlestep_ptid = inferior_ptid; |
c906108c SS |
547 | } |
548 | ||
c906108c | 549 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 550 | now to be followed, then do so. */ |
c906108c SS |
551 | switch (pending_follow.kind) |
552 | { | |
6604731b DJ |
553 | case TARGET_WAITKIND_FORKED: |
554 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 555 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
556 | if (follow_fork ()) |
557 | should_resume = 0; | |
c906108c SS |
558 | break; |
559 | ||
6604731b | 560 | case TARGET_WAITKIND_EXECD: |
c906108c | 561 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 562 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
563 | break; |
564 | ||
565 | default: | |
566 | break; | |
567 | } | |
c906108c SS |
568 | |
569 | /* Install inferior's terminal modes. */ | |
570 | target_terminal_inferior (); | |
571 | ||
572 | if (should_resume) | |
573 | { | |
39f77062 | 574 | ptid_t resume_ptid; |
dfcd3bfb | 575 | |
488f131b | 576 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e | 577 | |
8fb3e588 AC |
578 | if ((step || singlestep_breakpoints_inserted_p) |
579 | && (stepping_past_singlestep_breakpoint | |
580 | || (!breakpoints_inserted && breakpoint_here_p (read_pc ())))) | |
c906108c | 581 | { |
ef5cf84e MS |
582 | /* Stepping past a breakpoint without inserting breakpoints. |
583 | Make sure only the current thread gets to step, so that | |
584 | other threads don't sneak past breakpoints while they are | |
585 | not inserted. */ | |
c906108c | 586 | |
ef5cf84e | 587 | resume_ptid = inferior_ptid; |
c906108c | 588 | } |
ef5cf84e | 589 | |
8fb3e588 AC |
590 | if ((scheduler_mode == schedlock_on) |
591 | || (scheduler_mode == schedlock_step | |
592 | && (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 593 | { |
ef5cf84e | 594 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 595 | resume_ptid = inferior_ptid; |
c906108c | 596 | } |
ef5cf84e | 597 | |
c4ed33b9 AC |
598 | if (CANNOT_STEP_BREAKPOINT) |
599 | { | |
600 | /* Most targets can step a breakpoint instruction, thus | |
601 | executing it normally. But if this one cannot, just | |
602 | continue and we will hit it anyway. */ | |
603 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
604 | step = 0; | |
605 | } | |
39f77062 | 606 | target_resume (resume_ptid, step, sig); |
c906108c SS |
607 | } |
608 | ||
609 | discard_cleanups (old_cleanups); | |
610 | } | |
611 | \f | |
612 | ||
613 | /* Clear out all variables saying what to do when inferior is continued. | |
614 | First do this, then set the ones you want, then call `proceed'. */ | |
615 | ||
616 | void | |
96baa820 | 617 | clear_proceed_status (void) |
c906108c SS |
618 | { |
619 | trap_expected = 0; | |
620 | step_range_start = 0; | |
621 | step_range_end = 0; | |
aa0cd9c1 | 622 | step_frame_id = null_frame_id; |
5fbbeb29 | 623 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c | 624 | stop_after_trap = 0; |
c0236d92 | 625 | stop_soon = NO_STOP_QUIETLY; |
c906108c SS |
626 | proceed_to_finish = 0; |
627 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
628 | ||
629 | /* Discard any remaining commands or status from previous stop. */ | |
630 | bpstat_clear (&stop_bpstat); | |
631 | } | |
632 | ||
ea67f13b DJ |
633 | /* This should be suitable for any targets that support threads. */ |
634 | ||
635 | static int | |
636 | prepare_to_proceed (void) | |
637 | { | |
638 | ptid_t wait_ptid; | |
639 | struct target_waitstatus wait_status; | |
640 | ||
641 | /* Get the last target status returned by target_wait(). */ | |
642 | get_last_target_status (&wait_ptid, &wait_status); | |
643 | ||
644 | /* Make sure we were stopped either at a breakpoint, or because | |
645 | of a Ctrl-C. */ | |
646 | if (wait_status.kind != TARGET_WAITKIND_STOPPED | |
8fb3e588 AC |
647 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
648 | && wait_status.value.sig != TARGET_SIGNAL_INT)) | |
ea67f13b DJ |
649 | { |
650 | return 0; | |
651 | } | |
652 | ||
653 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
654 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
655 | { | |
656 | /* Switched over from WAIT_PID. */ | |
657 | CORE_ADDR wait_pc = read_pc_pid (wait_ptid); | |
658 | ||
659 | if (wait_pc != read_pc ()) | |
660 | { | |
661 | /* Switch back to WAIT_PID thread. */ | |
662 | inferior_ptid = wait_ptid; | |
663 | ||
664 | /* FIXME: This stuff came from switch_to_thread() in | |
665 | thread.c (which should probably be a public function). */ | |
666 | flush_cached_frames (); | |
667 | registers_changed (); | |
668 | stop_pc = wait_pc; | |
669 | select_frame (get_current_frame ()); | |
670 | } | |
671 | ||
8fb3e588 AC |
672 | /* We return 1 to indicate that there is a breakpoint here, |
673 | so we need to step over it before continuing to avoid | |
674 | hitting it straight away. */ | |
675 | if (breakpoint_here_p (wait_pc)) | |
676 | return 1; | |
ea67f13b DJ |
677 | } |
678 | ||
679 | return 0; | |
8fb3e588 | 680 | |
ea67f13b | 681 | } |
e4846b08 JJ |
682 | |
683 | /* Record the pc of the program the last time it stopped. This is | |
684 | just used internally by wait_for_inferior, but need to be preserved | |
685 | over calls to it and cleared when the inferior is started. */ | |
686 | static CORE_ADDR prev_pc; | |
687 | ||
c906108c SS |
688 | /* Basic routine for continuing the program in various fashions. |
689 | ||
690 | ADDR is the address to resume at, or -1 for resume where stopped. | |
691 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 692 | or -1 for act according to how it stopped. |
c906108c | 693 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
694 | -1 means return after that and print nothing. |
695 | You should probably set various step_... variables | |
696 | before calling here, if you are stepping. | |
c906108c SS |
697 | |
698 | You should call clear_proceed_status before calling proceed. */ | |
699 | ||
700 | void | |
96baa820 | 701 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
702 | { |
703 | int oneproc = 0; | |
704 | ||
705 | if (step > 0) | |
706 | step_start_function = find_pc_function (read_pc ()); | |
707 | if (step < 0) | |
708 | stop_after_trap = 1; | |
709 | ||
2acceee2 | 710 | if (addr == (CORE_ADDR) -1) |
c906108c | 711 | { |
c906108c | 712 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
3352ef37 AC |
713 | /* There is a breakpoint at the address we will resume at, |
714 | step one instruction before inserting breakpoints so that | |
715 | we do not stop right away (and report a second hit at this | |
716 | breakpoint). */ | |
c906108c | 717 | oneproc = 1; |
3352ef37 AC |
718 | else if (gdbarch_single_step_through_delay_p (current_gdbarch) |
719 | && gdbarch_single_step_through_delay (current_gdbarch, | |
720 | get_current_frame ())) | |
721 | /* We stepped onto an instruction that needs to be stepped | |
722 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
723 | oneproc = 1; |
724 | } | |
725 | else | |
726 | { | |
727 | write_pc (addr); | |
c906108c SS |
728 | } |
729 | ||
527159b7 RC |
730 | if (debug_infrun) |
731 | printf_unfiltered ("infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", | |
732 | paddr_nz (addr), siggnal, step); | |
733 | ||
c906108c SS |
734 | /* In a multi-threaded task we may select another thread |
735 | and then continue or step. | |
736 | ||
737 | But if the old thread was stopped at a breakpoint, it | |
738 | will immediately cause another breakpoint stop without | |
739 | any execution (i.e. it will report a breakpoint hit | |
740 | incorrectly). So we must step over it first. | |
741 | ||
ea67f13b | 742 | prepare_to_proceed checks the current thread against the thread |
c906108c SS |
743 | that reported the most recent event. If a step-over is required |
744 | it returns TRUE and sets the current thread to the old thread. */ | |
ea67f13b DJ |
745 | if (prepare_to_proceed () && breakpoint_here_p (read_pc ())) |
746 | oneproc = 1; | |
c906108c | 747 | |
c906108c SS |
748 | if (oneproc) |
749 | /* We will get a trace trap after one instruction. | |
750 | Continue it automatically and insert breakpoints then. */ | |
751 | trap_expected = 1; | |
752 | else | |
753 | { | |
81d0cc19 GS |
754 | insert_breakpoints (); |
755 | /* If we get here there was no call to error() in | |
8fb3e588 | 756 | insert breakpoints -- so they were inserted. */ |
c906108c SS |
757 | breakpoints_inserted = 1; |
758 | } | |
759 | ||
760 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
761 | stop_signal = siggnal; | |
762 | /* If this signal should not be seen by program, | |
763 | give it zero. Used for debugging signals. */ | |
764 | else if (!signal_program[stop_signal]) | |
765 | stop_signal = TARGET_SIGNAL_0; | |
766 | ||
767 | annotate_starting (); | |
768 | ||
769 | /* Make sure that output from GDB appears before output from the | |
770 | inferior. */ | |
771 | gdb_flush (gdb_stdout); | |
772 | ||
e4846b08 JJ |
773 | /* Refresh prev_pc value just prior to resuming. This used to be |
774 | done in stop_stepping, however, setting prev_pc there did not handle | |
775 | scenarios such as inferior function calls or returning from | |
776 | a function via the return command. In those cases, the prev_pc | |
777 | value was not set properly for subsequent commands. The prev_pc value | |
778 | is used to initialize the starting line number in the ecs. With an | |
779 | invalid value, the gdb next command ends up stopping at the position | |
780 | represented by the next line table entry past our start position. | |
781 | On platforms that generate one line table entry per line, this | |
782 | is not a problem. However, on the ia64, the compiler generates | |
783 | extraneous line table entries that do not increase the line number. | |
784 | When we issue the gdb next command on the ia64 after an inferior call | |
785 | or a return command, we often end up a few instructions forward, still | |
786 | within the original line we started. | |
787 | ||
788 | An attempt was made to have init_execution_control_state () refresh | |
789 | the prev_pc value before calculating the line number. This approach | |
790 | did not work because on platforms that use ptrace, the pc register | |
791 | cannot be read unless the inferior is stopped. At that point, we | |
792 | are not guaranteed the inferior is stopped and so the read_pc () | |
793 | call can fail. Setting the prev_pc value here ensures the value is | |
8fb3e588 | 794 | updated correctly when the inferior is stopped. */ |
e4846b08 JJ |
795 | prev_pc = read_pc (); |
796 | ||
c906108c SS |
797 | /* Resume inferior. */ |
798 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
799 | ||
800 | /* Wait for it to stop (if not standalone) | |
801 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
802 | /* Do this only if we are not using the event loop, or if the target |
803 | does not support asynchronous execution. */ | |
362646f5 | 804 | if (!target_can_async_p ()) |
43ff13b4 JM |
805 | { |
806 | wait_for_inferior (); | |
807 | normal_stop (); | |
808 | } | |
c906108c | 809 | } |
c906108c SS |
810 | \f |
811 | ||
812 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 813 | |
c906108c | 814 | void |
96baa820 | 815 | start_remote (void) |
c906108c SS |
816 | { |
817 | init_thread_list (); | |
818 | init_wait_for_inferior (); | |
c0236d92 | 819 | stop_soon = STOP_QUIETLY; |
c906108c | 820 | trap_expected = 0; |
43ff13b4 | 821 | |
6426a772 JM |
822 | /* Always go on waiting for the target, regardless of the mode. */ |
823 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 824 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
825 | nothing is returned (instead of just blocking). Because of this, |
826 | targets expecting an immediate response need to, internally, set | |
827 | things up so that the target_wait() is forced to eventually | |
828 | timeout. */ | |
829 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
830 | differentiate to its caller what the state of the target is after | |
831 | the initial open has been performed. Here we're assuming that | |
832 | the target has stopped. It should be possible to eventually have | |
833 | target_open() return to the caller an indication that the target | |
834 | is currently running and GDB state should be set to the same as | |
835 | for an async run. */ | |
836 | wait_for_inferior (); | |
837 | normal_stop (); | |
c906108c SS |
838 | } |
839 | ||
840 | /* Initialize static vars when a new inferior begins. */ | |
841 | ||
842 | void | |
96baa820 | 843 | init_wait_for_inferior (void) |
c906108c SS |
844 | { |
845 | /* These are meaningless until the first time through wait_for_inferior. */ | |
846 | prev_pc = 0; | |
c906108c | 847 | |
c906108c SS |
848 | breakpoints_inserted = 0; |
849 | breakpoint_init_inferior (inf_starting); | |
850 | ||
851 | /* Don't confuse first call to proceed(). */ | |
852 | stop_signal = TARGET_SIGNAL_0; | |
853 | ||
854 | /* The first resume is not following a fork/vfork/exec. */ | |
855 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c SS |
856 | |
857 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
858 | number_of_threads_in_syscalls = 0; | |
859 | ||
860 | clear_proceed_status (); | |
9f976b41 DJ |
861 | |
862 | stepping_past_singlestep_breakpoint = 0; | |
c906108c | 863 | } |
c906108c | 864 | \f |
b83266a0 SS |
865 | /* This enum encodes possible reasons for doing a target_wait, so that |
866 | wfi can call target_wait in one place. (Ultimately the call will be | |
867 | moved out of the infinite loop entirely.) */ | |
868 | ||
c5aa993b JM |
869 | enum infwait_states |
870 | { | |
cd0fc7c3 SS |
871 | infwait_normal_state, |
872 | infwait_thread_hop_state, | |
cd0fc7c3 | 873 | infwait_nonstep_watch_state |
b83266a0 SS |
874 | }; |
875 | ||
11cf8741 JM |
876 | /* Why did the inferior stop? Used to print the appropriate messages |
877 | to the interface from within handle_inferior_event(). */ | |
878 | enum inferior_stop_reason | |
879 | { | |
880 | /* We don't know why. */ | |
881 | STOP_UNKNOWN, | |
882 | /* Step, next, nexti, stepi finished. */ | |
883 | END_STEPPING_RANGE, | |
884 | /* Found breakpoint. */ | |
885 | BREAKPOINT_HIT, | |
886 | /* Inferior terminated by signal. */ | |
887 | SIGNAL_EXITED, | |
888 | /* Inferior exited. */ | |
889 | EXITED, | |
890 | /* Inferior received signal, and user asked to be notified. */ | |
891 | SIGNAL_RECEIVED | |
892 | }; | |
893 | ||
cd0fc7c3 SS |
894 | /* This structure contains what used to be local variables in |
895 | wait_for_inferior. Probably many of them can return to being | |
896 | locals in handle_inferior_event. */ | |
897 | ||
c5aa993b | 898 | struct execution_control_state |
488f131b JB |
899 | { |
900 | struct target_waitstatus ws; | |
901 | struct target_waitstatus *wp; | |
902 | int another_trap; | |
903 | int random_signal; | |
904 | CORE_ADDR stop_func_start; | |
905 | CORE_ADDR stop_func_end; | |
906 | char *stop_func_name; | |
907 | struct symtab_and_line sal; | |
488f131b JB |
908 | int current_line; |
909 | struct symtab *current_symtab; | |
910 | int handling_longjmp; /* FIXME */ | |
911 | ptid_t ptid; | |
912 | ptid_t saved_inferior_ptid; | |
68f53502 | 913 | int step_after_step_resume_breakpoint; |
488f131b JB |
914 | int stepping_through_solib_after_catch; |
915 | bpstat stepping_through_solib_catchpoints; | |
916 | int enable_hw_watchpoints_after_wait; | |
488f131b JB |
917 | int new_thread_event; |
918 | struct target_waitstatus tmpstatus; | |
919 | enum infwait_states infwait_state; | |
920 | ptid_t waiton_ptid; | |
921 | int wait_some_more; | |
922 | }; | |
923 | ||
924 | void init_execution_control_state (struct execution_control_state *ecs); | |
925 | ||
926 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 927 | |
c2c6d25f | 928 | static void step_into_function (struct execution_control_state *ecs); |
44cbf7b5 AC |
929 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
930 | static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
931 | struct frame_id sr_id); | |
104c1213 JM |
932 | static void stop_stepping (struct execution_control_state *ecs); |
933 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 934 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
935 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
936 | int stop_info); | |
104c1213 | 937 | |
cd0fc7c3 SS |
938 | /* Wait for control to return from inferior to debugger. |
939 | If inferior gets a signal, we may decide to start it up again | |
940 | instead of returning. That is why there is a loop in this function. | |
941 | When this function actually returns it means the inferior | |
942 | should be left stopped and GDB should read more commands. */ | |
943 | ||
944 | void | |
96baa820 | 945 | wait_for_inferior (void) |
cd0fc7c3 SS |
946 | { |
947 | struct cleanup *old_cleanups; | |
948 | struct execution_control_state ecss; | |
949 | struct execution_control_state *ecs; | |
c906108c | 950 | |
527159b7 RC |
951 | if (debug_infrun) |
952 | printf_unfiltered ("infrun: wait_for_inferior\n"); | |
953 | ||
8601f500 | 954 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 955 | &step_resume_breakpoint); |
cd0fc7c3 SS |
956 | |
957 | /* wfi still stays in a loop, so it's OK just to take the address of | |
958 | a local to get the ecs pointer. */ | |
959 | ecs = &ecss; | |
960 | ||
961 | /* Fill in with reasonable starting values. */ | |
962 | init_execution_control_state (ecs); | |
963 | ||
c906108c | 964 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 965 | previous_inferior_ptid = inferior_ptid; |
c906108c | 966 | |
cd0fc7c3 SS |
967 | overlay_cache_invalid = 1; |
968 | ||
969 | /* We have to invalidate the registers BEFORE calling target_wait | |
970 | because they can be loaded from the target while in target_wait. | |
971 | This makes remote debugging a bit more efficient for those | |
972 | targets that provide critical registers as part of their normal | |
973 | status mechanism. */ | |
974 | ||
975 | registers_changed (); | |
b83266a0 | 976 | |
c906108c SS |
977 | while (1) |
978 | { | |
9a4105ab AC |
979 | if (deprecated_target_wait_hook) |
980 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); | |
cd0fc7c3 | 981 | else |
39f77062 | 982 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 983 | |
cd0fc7c3 SS |
984 | /* Now figure out what to do with the result of the result. */ |
985 | handle_inferior_event (ecs); | |
c906108c | 986 | |
cd0fc7c3 SS |
987 | if (!ecs->wait_some_more) |
988 | break; | |
989 | } | |
990 | do_cleanups (old_cleanups); | |
991 | } | |
c906108c | 992 | |
43ff13b4 JM |
993 | /* Asynchronous version of wait_for_inferior. It is called by the |
994 | event loop whenever a change of state is detected on the file | |
995 | descriptor corresponding to the target. It can be called more than | |
996 | once to complete a single execution command. In such cases we need | |
997 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
998 | last time that this function is called for a single execution | |
999 | command, then report to the user that the inferior has stopped, and | |
1000 | do the necessary cleanups. */ | |
1001 | ||
1002 | struct execution_control_state async_ecss; | |
1003 | struct execution_control_state *async_ecs; | |
1004 | ||
1005 | void | |
fba45db2 | 1006 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1007 | { |
1008 | static struct cleanup *old_cleanups; | |
1009 | ||
c5aa993b | 1010 | async_ecs = &async_ecss; |
43ff13b4 JM |
1011 | |
1012 | if (!async_ecs->wait_some_more) | |
1013 | { | |
488f131b | 1014 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1015 | &step_resume_breakpoint); |
43ff13b4 JM |
1016 | |
1017 | /* Fill in with reasonable starting values. */ | |
1018 | init_execution_control_state (async_ecs); | |
1019 | ||
43ff13b4 | 1020 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1021 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1022 | |
1023 | overlay_cache_invalid = 1; | |
1024 | ||
1025 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1026 | because they can be loaded from the target while in target_wait. |
1027 | This makes remote debugging a bit more efficient for those | |
1028 | targets that provide critical registers as part of their normal | |
1029 | status mechanism. */ | |
43ff13b4 JM |
1030 | |
1031 | registers_changed (); | |
1032 | } | |
1033 | ||
9a4105ab | 1034 | if (deprecated_target_wait_hook) |
488f131b | 1035 | async_ecs->ptid = |
9a4105ab | 1036 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1037 | else |
39f77062 | 1038 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1039 | |
1040 | /* Now figure out what to do with the result of the result. */ | |
1041 | handle_inferior_event (async_ecs); | |
1042 | ||
1043 | if (!async_ecs->wait_some_more) | |
1044 | { | |
adf40b2e | 1045 | /* Do only the cleanups that have been added by this |
488f131b JB |
1046 | function. Let the continuations for the commands do the rest, |
1047 | if there are any. */ | |
43ff13b4 JM |
1048 | do_exec_cleanups (old_cleanups); |
1049 | normal_stop (); | |
c2d11a7d JM |
1050 | if (step_multi && stop_step) |
1051 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1052 | else | |
1053 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1054 | } |
1055 | } | |
1056 | ||
cd0fc7c3 SS |
1057 | /* Prepare an execution control state for looping through a |
1058 | wait_for_inferior-type loop. */ | |
1059 | ||
1060 | void | |
96baa820 | 1061 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1062 | { |
c2d11a7d | 1063 | /* ecs->another_trap? */ |
cd0fc7c3 | 1064 | ecs->random_signal = 0; |
68f53502 | 1065 | ecs->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 | 1066 | ecs->handling_longjmp = 0; /* FIXME */ |
cd0fc7c3 SS |
1067 | ecs->stepping_through_solib_after_catch = 0; |
1068 | ecs->stepping_through_solib_catchpoints = NULL; | |
1069 | ecs->enable_hw_watchpoints_after_wait = 0; | |
cd0fc7c3 SS |
1070 | ecs->sal = find_pc_line (prev_pc, 0); |
1071 | ecs->current_line = ecs->sal.line; | |
1072 | ecs->current_symtab = ecs->sal.symtab; | |
1073 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1074 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1075 | ecs->wp = &(ecs->ws); |
1076 | } | |
1077 | ||
e02bc4cc | 1078 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1079 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1080 | cached by handle_inferior_event(), which gets called immediately | |
1081 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1082 | |
1083 | void | |
488f131b | 1084 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1085 | { |
39f77062 | 1086 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1087 | *status = target_last_waitstatus; |
1088 | } | |
1089 | ||
dd80620e MS |
1090 | /* Switch thread contexts, maintaining "infrun state". */ |
1091 | ||
1092 | static void | |
1093 | context_switch (struct execution_control_state *ecs) | |
1094 | { | |
1095 | /* Caution: it may happen that the new thread (or the old one!) | |
1096 | is not in the thread list. In this case we must not attempt | |
1097 | to "switch context", or we run the risk that our context may | |
1098 | be lost. This may happen as a result of the target module | |
1099 | mishandling thread creation. */ | |
1100 | ||
1101 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) | |
488f131b | 1102 | { /* Perform infrun state context switch: */ |
dd80620e | 1103 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1104 | save_infrun_state (inferior_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 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1114 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1115 | &trap_expected, &step_resume_breakpoint, |
15960608 | 1116 | &step_range_start, |
aa0cd9c1 | 1117 | &step_range_end, &step_frame_id, |
dd80620e MS |
1118 | &ecs->handling_longjmp, &ecs->another_trap, |
1119 | &ecs->stepping_through_solib_after_catch, | |
1120 | &ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1121 | &ecs->current_line, &ecs->current_symtab); |
dd80620e MS |
1122 | } |
1123 | inferior_ptid = ecs->ptid; | |
1124 | } | |
1125 | ||
4fa8626c DJ |
1126 | static void |
1127 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1128 | { | |
8aad930b | 1129 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1130 | |
1131 | /* If this target does not decrement the PC after breakpoints, then | |
1132 | we have nothing to do. */ | |
1133 | if (DECR_PC_AFTER_BREAK == 0) | |
1134 | return; | |
1135 | ||
1136 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1137 | we aren't, just return. | |
9709f61c DJ |
1138 | |
1139 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
1140 | affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented | |
1141 | by software breakpoints should be handled through the normal breakpoint | |
1142 | layer. | |
8fb3e588 | 1143 | |
4fa8626c DJ |
1144 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
1145 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1146 | clear where the PC is pointing afterwards. It may not match | |
1147 | DECR_PC_AFTER_BREAK. I don't know any specific target that generates | |
1148 | these signals at breakpoints (the code has been in GDB since at least | |
1149 | 1992) so I can not guess how to handle them here. | |
8fb3e588 | 1150 | |
4fa8626c DJ |
1151 | In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS |
1152 | would have the PC after hitting a watchpoint affected by | |
1153 | DECR_PC_AFTER_BREAK. I haven't found any target with both of these set | |
1154 | in GDB history, and it seems unlikely to be correct, so | |
1155 | HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */ | |
1156 | ||
1157 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1158 | return; | |
1159 | ||
1160 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1161 | return; | |
1162 | ||
8aad930b AC |
1163 | /* Find the location where (if we've hit a breakpoint) the |
1164 | breakpoint would be. */ | |
1165 | breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK; | |
1166 | ||
1167 | if (SOFTWARE_SINGLE_STEP_P ()) | |
1168 | { | |
1169 | /* When using software single-step, a SIGTRAP can only indicate | |
8fb3e588 AC |
1170 | an inserted breakpoint. This actually makes things |
1171 | easier. */ | |
8aad930b AC |
1172 | if (singlestep_breakpoints_inserted_p) |
1173 | /* When software single stepping, the instruction at [prev_pc] | |
1174 | is never a breakpoint, but the instruction following | |
1175 | [prev_pc] (in program execution order) always is. Assume | |
1176 | that following instruction was reached and hence a software | |
1177 | breakpoint was hit. */ | |
1178 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1179 | else if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1180 | /* The inferior was free running (i.e., no single-step | |
1181 | breakpoints inserted) and it hit a software breakpoint. */ | |
1182 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1183 | } | |
1184 | else | |
1185 | { | |
1186 | /* When using hardware single-step, a SIGTRAP is reported for | |
8fb3e588 AC |
1187 | both a completed single-step and a software breakpoint. Need |
1188 | to differentiate between the two as the latter needs | |
1189 | adjusting but the former does not. */ | |
8aad930b AC |
1190 | if (currently_stepping (ecs)) |
1191 | { | |
1192 | if (prev_pc == breakpoint_pc | |
1193 | && software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1194 | /* Hardware single-stepped a software breakpoint (as | |
1195 | occures when the inferior is resumed with PC pointing | |
1196 | at not-yet-hit software breakpoint). Since the | |
1197 | breakpoint really is executed, the inferior needs to be | |
1198 | backed up to the breakpoint address. */ | |
1199 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1200 | } | |
1201 | else | |
1202 | { | |
1203 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1204 | /* The inferior was free running (i.e., no hardware | |
1205 | single-step and no possibility of a false SIGTRAP) and | |
1206 | hit a software breakpoint. */ | |
1207 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1208 | } | |
1209 | } | |
4fa8626c DJ |
1210 | } |
1211 | ||
cd0fc7c3 SS |
1212 | /* Given an execution control state that has been freshly filled in |
1213 | by an event from the inferior, figure out what it means and take | |
1214 | appropriate action. */ | |
c906108c | 1215 | |
7270d8f2 OF |
1216 | int stepped_after_stopped_by_watchpoint; |
1217 | ||
cd0fc7c3 | 1218 | void |
96baa820 | 1219 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1220 | { |
65e82032 AC |
1221 | /* NOTE: cagney/2003-03-28: If you're looking at this code and |
1222 | thinking that the variable stepped_after_stopped_by_watchpoint | |
1223 | isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT, | |
1224 | defined in the file "config/pa/nm-hppah.h", accesses the variable | |
1225 | indirectly. Mutter something rude about the HP merge. */ | |
c8edd8b4 | 1226 | int sw_single_step_trap_p = 0; |
8fb3e588 | 1227 | int stopped_by_watchpoint = -1; /* Mark as unknown. */ |
cd0fc7c3 | 1228 | |
e02bc4cc | 1229 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1230 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1231 | target_last_waitstatus = *ecs->wp; |
1232 | ||
4fa8626c DJ |
1233 | adjust_pc_after_break (ecs); |
1234 | ||
488f131b JB |
1235 | switch (ecs->infwait_state) |
1236 | { | |
1237 | case infwait_thread_hop_state: | |
527159b7 RC |
1238 | if (debug_infrun) |
1239 | printf_unfiltered ("infrun: infwait_thread_hop_state\n"); | |
488f131b JB |
1240 | /* Cancel the waiton_ptid. */ |
1241 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 AC |
1242 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1243 | is serviced in this loop, below. */ | |
1244 | if (ecs->enable_hw_watchpoints_after_wait) | |
1245 | { | |
1246 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1247 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1248 | } | |
1249 | stepped_after_stopped_by_watchpoint = 0; | |
1250 | break; | |
b83266a0 | 1251 | |
488f131b | 1252 | case infwait_normal_state: |
527159b7 RC |
1253 | if (debug_infrun) |
1254 | printf_unfiltered ("infrun: infwait_normal_state\n"); | |
488f131b JB |
1255 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1256 | is serviced in this loop, below. */ | |
1257 | if (ecs->enable_hw_watchpoints_after_wait) | |
1258 | { | |
1259 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1260 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1261 | } | |
1262 | stepped_after_stopped_by_watchpoint = 0; | |
1263 | break; | |
b83266a0 | 1264 | |
488f131b | 1265 | case infwait_nonstep_watch_state: |
527159b7 RC |
1266 | if (debug_infrun) |
1267 | printf_unfiltered ("infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 1268 | insert_breakpoints (); |
c906108c | 1269 | |
488f131b JB |
1270 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1271 | handle things like signals arriving and other things happening | |
1272 | in combination correctly? */ | |
1273 | stepped_after_stopped_by_watchpoint = 1; | |
1274 | break; | |
65e82032 AC |
1275 | |
1276 | default: | |
1277 | internal_error (__FILE__, __LINE__, "bad switch"); | |
488f131b JB |
1278 | } |
1279 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1280 | |
488f131b | 1281 | flush_cached_frames (); |
c906108c | 1282 | |
488f131b | 1283 | /* If it's a new process, add it to the thread database */ |
c906108c | 1284 | |
488f131b | 1285 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
b9b5d7ea | 1286 | && !ptid_equal (ecs->ptid, minus_one_ptid) |
488f131b JB |
1287 | && !in_thread_list (ecs->ptid)); |
1288 | ||
1289 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1290 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1291 | { | |
1292 | add_thread (ecs->ptid); | |
c906108c | 1293 | |
488f131b JB |
1294 | ui_out_text (uiout, "[New "); |
1295 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1296 | ui_out_text (uiout, "]\n"); | |
488f131b | 1297 | } |
c906108c | 1298 | |
488f131b JB |
1299 | switch (ecs->ws.kind) |
1300 | { | |
1301 | case TARGET_WAITKIND_LOADED: | |
527159b7 RC |
1302 | if (debug_infrun) |
1303 | printf_unfiltered ("infrun: TARGET_WAITKIND_LOADED\n"); | |
488f131b JB |
1304 | /* Ignore gracefully during startup of the inferior, as it |
1305 | might be the shell which has just loaded some objects, | |
1306 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1307 | #ifdef SOLIB_ADD |
c0236d92 | 1308 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1309 | { |
1310 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1311 | breakpoint addresses via breakpoint_re_set. */ | |
1312 | if (breakpoints_inserted) | |
1313 | remove_breakpoints (); | |
c906108c | 1314 | |
488f131b JB |
1315 | /* Check for any newly added shared libraries if we're |
1316 | supposed to be adding them automatically. Switch | |
1317 | terminal for any messages produced by | |
1318 | breakpoint_re_set. */ | |
1319 | target_terminal_ours_for_output (); | |
aff6338a | 1320 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
1321 | stack's section table is kept up-to-date. Architectures, |
1322 | (e.g., PPC64), use the section table to perform | |
1323 | operations such as address => section name and hence | |
1324 | require the table to contain all sections (including | |
1325 | those found in shared libraries). */ | |
aff6338a | 1326 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
1327 | exec_ops to SOLIB_ADD. This is because current GDB is |
1328 | only tooled to propagate section_table changes out from | |
1329 | the "current_target" (see target_resize_to_sections), and | |
1330 | not up from the exec stratum. This, of course, isn't | |
1331 | right. "infrun.c" should only interact with the | |
1332 | exec/process stratum, instead relying on the target stack | |
1333 | to propagate relevant changes (stop, section table | |
1334 | changed, ...) up to other layers. */ | |
aff6338a | 1335 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
1336 | target_terminal_inferior (); |
1337 | ||
1338 | /* Reinsert breakpoints and continue. */ | |
1339 | if (breakpoints_inserted) | |
1340 | insert_breakpoints (); | |
1341 | } | |
c906108c | 1342 | #endif |
488f131b JB |
1343 | resume (0, TARGET_SIGNAL_0); |
1344 | prepare_to_wait (ecs); | |
1345 | return; | |
c5aa993b | 1346 | |
488f131b | 1347 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 RC |
1348 | if (debug_infrun) |
1349 | printf_unfiltered ("infrun: TARGET_WAITKIND_SPURIOUS\n"); | |
488f131b JB |
1350 | resume (0, TARGET_SIGNAL_0); |
1351 | prepare_to_wait (ecs); | |
1352 | return; | |
c5aa993b | 1353 | |
488f131b | 1354 | case TARGET_WAITKIND_EXITED: |
527159b7 RC |
1355 | if (debug_infrun) |
1356 | printf_unfiltered ("infrun: TARGET_WAITKIND_EXITED\n"); | |
488f131b JB |
1357 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1358 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1359 | ||
1360 | /* Record the exit code in the convenience variable $_exitcode, so | |
1361 | that the user can inspect this again later. */ | |
1362 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1363 | value_from_longest (builtin_type_int, | |
1364 | (LONGEST) ecs->ws.value.integer)); | |
1365 | gdb_flush (gdb_stdout); | |
1366 | target_mourn_inferior (); | |
1367 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1368 | stop_print_frame = 0; | |
1369 | stop_stepping (ecs); | |
1370 | return; | |
c5aa993b | 1371 | |
488f131b | 1372 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 RC |
1373 | if (debug_infrun) |
1374 | printf_unfiltered ("infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
488f131b JB |
1375 | stop_print_frame = 0; |
1376 | stop_signal = ecs->ws.value.sig; | |
1377 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1378 | |
488f131b JB |
1379 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1380 | reach here unless the inferior is dead. However, for years | |
1381 | target_kill() was called here, which hints that fatal signals aren't | |
1382 | really fatal on some systems. If that's true, then some changes | |
1383 | may be needed. */ | |
1384 | target_mourn_inferior (); | |
c906108c | 1385 | |
488f131b JB |
1386 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1387 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1388 | stop_stepping (ecs); | |
1389 | return; | |
c906108c | 1390 | |
488f131b JB |
1391 | /* The following are the only cases in which we keep going; |
1392 | the above cases end in a continue or goto. */ | |
1393 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1394 | case TARGET_WAITKIND_VFORKED: |
527159b7 RC |
1395 | if (debug_infrun) |
1396 | printf_unfiltered ("infrun: TARGET_WAITKIND_FORKED\n"); | |
488f131b JB |
1397 | stop_signal = TARGET_SIGNAL_TRAP; |
1398 | pending_follow.kind = ecs->ws.kind; | |
1399 | ||
8e7d2c16 DJ |
1400 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1401 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1402 | |
488f131b | 1403 | stop_pc = read_pc (); |
675bf4cb | 1404 | |
00d4360e | 1405 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1406 | |
488f131b | 1407 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1408 | |
1409 | /* If no catchpoint triggered for this, then keep going. */ | |
1410 | if (ecs->random_signal) | |
1411 | { | |
1412 | stop_signal = TARGET_SIGNAL_0; | |
1413 | keep_going (ecs); | |
1414 | return; | |
1415 | } | |
488f131b JB |
1416 | goto process_event_stop_test; |
1417 | ||
1418 | case TARGET_WAITKIND_EXECD: | |
527159b7 RC |
1419 | if (debug_infrun) |
1420 | printf_unfiltered ("infrun: TARGET_WAITKIND_EXECED\n"); | |
488f131b JB |
1421 | stop_signal = TARGET_SIGNAL_TRAP; |
1422 | ||
7d2830a3 | 1423 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
8fb3e588 AC |
1424 | target_wait function. Until then following vfork on HP/UX 10.20 |
1425 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1426 | /* Is this a target which reports multiple exec events per actual |
1427 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1428 | ignore all but the last one. Just resume the exec'r, and wait | |
1429 | for the next exec event. */ | |
1430 | if (inferior_ignoring_leading_exec_events) | |
1431 | { | |
1432 | inferior_ignoring_leading_exec_events--; | |
1433 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1434 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event. | |
1435 | parent_pid); | |
1436 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); | |
1437 | prepare_to_wait (ecs); | |
1438 | return; | |
1439 | } | |
1440 | inferior_ignoring_leading_exec_events = | |
1441 | target_reported_exec_events_per_exec_call () - 1; | |
1442 | ||
1443 | pending_follow.execd_pathname = | |
1444 | savestring (ecs->ws.value.execd_pathname, | |
1445 | strlen (ecs->ws.value.execd_pathname)); | |
1446 | ||
488f131b JB |
1447 | /* This causes the eventpoints and symbol table to be reset. Must |
1448 | do this now, before trying to determine whether to stop. */ | |
1449 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1450 | xfree (pending_follow.execd_pathname); | |
c906108c | 1451 | |
488f131b JB |
1452 | stop_pc = read_pc_pid (ecs->ptid); |
1453 | ecs->saved_inferior_ptid = inferior_ptid; | |
1454 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1455 | |
00d4360e | 1456 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1457 | |
488f131b JB |
1458 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1459 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 DJ |
1460 | |
1461 | /* If no catchpoint triggered for this, then keep going. */ | |
1462 | if (ecs->random_signal) | |
1463 | { | |
1464 | stop_signal = TARGET_SIGNAL_0; | |
1465 | keep_going (ecs); | |
1466 | return; | |
1467 | } | |
488f131b JB |
1468 | goto process_event_stop_test; |
1469 | ||
1470 | /* These syscall events are returned on HP-UX, as part of its | |
1471 | implementation of page-protection-based "hardware" watchpoints. | |
1472 | HP-UX has unfortunate interactions between page-protections and | |
1473 | some system calls. Our solution is to disable hardware watches | |
1474 | when a system call is entered, and reenable them when the syscall | |
1475 | completes. The downside of this is that we may miss the precise | |
1476 | point at which a watched piece of memory is modified. "Oh well." | |
1477 | ||
1478 | Note that we may have multiple threads running, which may each | |
1479 | enter syscalls at roughly the same time. Since we don't have a | |
1480 | good notion currently of whether a watched piece of memory is | |
1481 | thread-private, we'd best not have any page-protections active | |
1482 | when any thread is in a syscall. Thus, we only want to reenable | |
1483 | hardware watches when no threads are in a syscall. | |
1484 | ||
1485 | Also, be careful not to try to gather much state about a thread | |
1486 | that's in a syscall. It's frequently a losing proposition. */ | |
1487 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
527159b7 RC |
1488 | if (debug_infrun) |
1489 | printf_unfiltered ("infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
488f131b JB |
1490 | number_of_threads_in_syscalls++; |
1491 | if (number_of_threads_in_syscalls == 1) | |
1492 | { | |
1493 | TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1494 | } | |
1495 | resume (0, TARGET_SIGNAL_0); | |
1496 | prepare_to_wait (ecs); | |
1497 | return; | |
c906108c | 1498 | |
488f131b JB |
1499 | /* Before examining the threads further, step this thread to |
1500 | get it entirely out of the syscall. (We get notice of the | |
1501 | event when the thread is just on the verge of exiting a | |
1502 | syscall. Stepping one instruction seems to get it back | |
1503 | into user code.) | |
c906108c | 1504 | |
488f131b JB |
1505 | Note that although the logical place to reenable h/w watches |
1506 | is here, we cannot. We cannot reenable them before stepping | |
1507 | the thread (this causes the next wait on the thread to hang). | |
c4093a6a | 1508 | |
488f131b JB |
1509 | Nor can we enable them after stepping until we've done a wait. |
1510 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait | |
1511 | here, which will be serviced immediately after the target | |
1512 | is waited on. */ | |
1513 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
527159b7 RC |
1514 | if (debug_infrun) |
1515 | printf_unfiltered ("infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
488f131b JB |
1516 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
1517 | ||
1518 | if (number_of_threads_in_syscalls > 0) | |
1519 | { | |
1520 | number_of_threads_in_syscalls--; | |
1521 | ecs->enable_hw_watchpoints_after_wait = | |
1522 | (number_of_threads_in_syscalls == 0); | |
1523 | } | |
1524 | prepare_to_wait (ecs); | |
1525 | return; | |
c906108c | 1526 | |
488f131b | 1527 | case TARGET_WAITKIND_STOPPED: |
527159b7 RC |
1528 | if (debug_infrun) |
1529 | printf_unfiltered ("infrun: TARGET_WAITKIND_STOPPED\n"); | |
488f131b JB |
1530 | stop_signal = ecs->ws.value.sig; |
1531 | break; | |
c906108c | 1532 | |
488f131b JB |
1533 | /* We had an event in the inferior, but we are not interested |
1534 | in handling it at this level. The lower layers have already | |
8e7d2c16 | 1535 | done what needs to be done, if anything. |
8fb3e588 AC |
1536 | |
1537 | One of the possible circumstances for this is when the | |
1538 | inferior produces output for the console. The inferior has | |
1539 | not stopped, and we are ignoring the event. Another possible | |
1540 | circumstance is any event which the lower level knows will be | |
1541 | reported multiple times without an intervening resume. */ | |
488f131b | 1542 | case TARGET_WAITKIND_IGNORE: |
527159b7 RC |
1543 | if (debug_infrun) |
1544 | printf_unfiltered ("infrun: TARGET_WAITKIND_IGNORE\n"); | |
8e7d2c16 | 1545 | prepare_to_wait (ecs); |
488f131b JB |
1546 | return; |
1547 | } | |
c906108c | 1548 | |
488f131b JB |
1549 | /* We may want to consider not doing a resume here in order to give |
1550 | the user a chance to play with the new thread. It might be good | |
1551 | to make that a user-settable option. */ | |
c906108c | 1552 | |
488f131b JB |
1553 | /* At this point, all threads are stopped (happens automatically in |
1554 | either the OS or the native code). Therefore we need to continue | |
1555 | all threads in order to make progress. */ | |
1556 | if (ecs->new_thread_event) | |
1557 | { | |
1558 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1559 | prepare_to_wait (ecs); | |
1560 | return; | |
1561 | } | |
c906108c | 1562 | |
488f131b JB |
1563 | stop_pc = read_pc_pid (ecs->ptid); |
1564 | ||
527159b7 RC |
1565 | if (debug_infrun) |
1566 | printf_unfiltered ("infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc)); | |
1567 | ||
9f976b41 DJ |
1568 | if (stepping_past_singlestep_breakpoint) |
1569 | { | |
8fb3e588 AC |
1570 | gdb_assert (SOFTWARE_SINGLE_STEP_P () |
1571 | && singlestep_breakpoints_inserted_p); | |
9f976b41 DJ |
1572 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
1573 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1574 | ||
1575 | stepping_past_singlestep_breakpoint = 0; | |
1576 | ||
1577 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
1578 | breakpoint, or stopped for some other reason. It would be nice if |
1579 | we could tell, but we can't reliably. */ | |
9f976b41 | 1580 | if (stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 1581 | { |
527159b7 RC |
1582 | if (debug_infrun) |
1583 | printf_unfiltered ("infrun: stepping_past_singlestep_breakpoint\n"); | |
9f976b41 DJ |
1584 | /* Pull the single step breakpoints out of the target. */ |
1585 | SOFTWARE_SINGLE_STEP (0, 0); | |
1586 | singlestep_breakpoints_inserted_p = 0; | |
1587 | ||
1588 | ecs->random_signal = 0; | |
1589 | ||
1590 | ecs->ptid = saved_singlestep_ptid; | |
1591 | context_switch (ecs); | |
9a4105ab AC |
1592 | if (deprecated_context_hook) |
1593 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1594 | |
1595 | resume (1, TARGET_SIGNAL_0); | |
1596 | prepare_to_wait (ecs); | |
1597 | return; | |
1598 | } | |
1599 | } | |
1600 | ||
1601 | stepping_past_singlestep_breakpoint = 0; | |
1602 | ||
488f131b JB |
1603 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1604 | another thread. If so, then step that thread past the breakpoint, | |
1605 | and continue it. */ | |
1606 | ||
1607 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1608 | { | |
9f976b41 DJ |
1609 | int thread_hop_needed = 0; |
1610 | ||
f8d40ec8 JB |
1611 | /* Check if a regular breakpoint has been hit before checking |
1612 | for a potential single step breakpoint. Otherwise, GDB will | |
1613 | not see this breakpoint hit when stepping onto breakpoints. */ | |
4fa8626c | 1614 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
488f131b | 1615 | { |
c5aa993b | 1616 | ecs->random_signal = 0; |
4fa8626c | 1617 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1618 | thread_hop_needed = 1; |
1619 | } | |
1620 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1621 | { | |
1622 | ecs->random_signal = 0; | |
1623 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1624 | change when we go from single-threaded to multi-threaded. If | |
1625 | the singlestep_ptid is still in the list, assume that it is | |
1626 | really different from ecs->ptid. */ | |
1627 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1628 | && in_thread_list (singlestep_ptid)) | |
1629 | { | |
1630 | thread_hop_needed = 1; | |
1631 | stepping_past_singlestep_breakpoint = 1; | |
1632 | saved_singlestep_ptid = singlestep_ptid; | |
1633 | } | |
1634 | } | |
1635 | ||
1636 | if (thread_hop_needed) | |
8fb3e588 AC |
1637 | { |
1638 | int remove_status; | |
1639 | ||
527159b7 RC |
1640 | if (debug_infrun) |
1641 | printf_unfiltered ("infrun: thread_hop_needed\n"); | |
1642 | ||
8fb3e588 AC |
1643 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1644 | Just continue. */ | |
1645 | ||
1646 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
488f131b | 1647 | { |
8fb3e588 AC |
1648 | /* Pull the single step breakpoints out of the target. */ |
1649 | SOFTWARE_SINGLE_STEP (0, 0); | |
1650 | singlestep_breakpoints_inserted_p = 0; | |
1651 | } | |
1652 | ||
1653 | remove_status = remove_breakpoints (); | |
1654 | /* Did we fail to remove breakpoints? If so, try | |
1655 | to set the PC past the bp. (There's at least | |
1656 | one situation in which we can fail to remove | |
1657 | the bp's: On HP-UX's that use ttrace, we can't | |
1658 | change the address space of a vforking child | |
1659 | process until the child exits (well, okay, not | |
1660 | then either :-) or execs. */ | |
1661 | if (remove_status != 0) | |
1662 | { | |
1663 | /* FIXME! This is obviously non-portable! */ | |
1664 | write_pc_pid (stop_pc + 4, ecs->ptid); | |
1665 | /* We need to restart all the threads now, | |
1666 | * unles we're running in scheduler-locked mode. | |
1667 | * Use currently_stepping to determine whether to | |
1668 | * step or continue. | |
1669 | */ | |
1670 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1671 | if (scheduler_mode == schedlock_on) | |
1672 | target_resume (ecs->ptid, | |
1673 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
488f131b | 1674 | else |
8fb3e588 AC |
1675 | target_resume (RESUME_ALL, |
1676 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1677 | prepare_to_wait (ecs); | |
1678 | return; | |
1679 | } | |
1680 | else | |
1681 | { /* Single step */ | |
1682 | breakpoints_inserted = 0; | |
1683 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1684 | context_switch (ecs); | |
1685 | ecs->waiton_ptid = ecs->ptid; | |
1686 | ecs->wp = &(ecs->ws); | |
1687 | ecs->another_trap = 1; | |
1688 | ||
1689 | ecs->infwait_state = infwait_thread_hop_state; | |
1690 | keep_going (ecs); | |
1691 | registers_changed (); | |
1692 | return; | |
1693 | } | |
488f131b | 1694 | } |
f8d40ec8 | 1695 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
1696 | { |
1697 | sw_single_step_trap_p = 1; | |
1698 | ecs->random_signal = 0; | |
1699 | } | |
488f131b JB |
1700 | } |
1701 | else | |
1702 | ecs->random_signal = 1; | |
c906108c | 1703 | |
488f131b | 1704 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1705 | so, then switch to that thread. */ |
1706 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1707 | { |
527159b7 RC |
1708 | if (debug_infrun) |
1709 | printf_unfiltered ("infrun: context switch\n"); | |
1710 | ||
488f131b | 1711 | context_switch (ecs); |
c5aa993b | 1712 | |
9a4105ab AC |
1713 | if (deprecated_context_hook) |
1714 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
c5aa993b | 1715 | |
488f131b JB |
1716 | flush_cached_frames (); |
1717 | } | |
c906108c | 1718 | |
488f131b JB |
1719 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1720 | { | |
1721 | /* Pull the single step breakpoints out of the target. */ | |
1722 | SOFTWARE_SINGLE_STEP (0, 0); | |
1723 | singlestep_breakpoints_inserted_p = 0; | |
1724 | } | |
c906108c | 1725 | |
488f131b JB |
1726 | /* It may not be necessary to disable the watchpoint to stop over |
1727 | it. For example, the PA can (with some kernel cooperation) | |
1728 | single step over a watchpoint without disabling the watchpoint. */ | |
1729 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1730 | { | |
527159b7 RC |
1731 | if (debug_infrun) |
1732 | printf_unfiltered ("infrun: STOPPED_BY_WATCHPOINT\n"); | |
488f131b JB |
1733 | resume (1, 0); |
1734 | prepare_to_wait (ecs); | |
1735 | return; | |
1736 | } | |
c906108c | 1737 | |
488f131b JB |
1738 | /* It is far more common to need to disable a watchpoint to step |
1739 | the inferior over it. FIXME. What else might a debug | |
1740 | register or page protection watchpoint scheme need here? */ | |
1741 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1742 | { | |
1743 | /* At this point, we are stopped at an instruction which has | |
1744 | attempted to write to a piece of memory under control of | |
1745 | a watchpoint. The instruction hasn't actually executed | |
1746 | yet. If we were to evaluate the watchpoint expression | |
1747 | now, we would get the old value, and therefore no change | |
1748 | would seem to have occurred. | |
1749 | ||
1750 | In order to make watchpoints work `right', we really need | |
1751 | to complete the memory write, and then evaluate the | |
1752 | watchpoint expression. The following code does that by | |
1753 | removing the watchpoint (actually, all watchpoints and | |
1754 | breakpoints), single-stepping the target, re-inserting | |
1755 | watchpoints, and then falling through to let normal | |
1756 | single-step processing handle proceed. Since this | |
1757 | includes evaluating watchpoints, things will come to a | |
1758 | stop in the correct manner. */ | |
1759 | ||
527159b7 RC |
1760 | if (debug_infrun) |
1761 | printf_unfiltered ("infrun: STOPPED_BY_WATCHPOINT\n"); | |
488f131b JB |
1762 | remove_breakpoints (); |
1763 | registers_changed (); | |
1764 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1765 | |
488f131b JB |
1766 | ecs->waiton_ptid = ecs->ptid; |
1767 | ecs->wp = &(ecs->ws); | |
1768 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1769 | prepare_to_wait (ecs); | |
1770 | return; | |
1771 | } | |
1772 | ||
1773 | /* It may be possible to simply continue after a watchpoint. */ | |
1774 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
00d4360e | 1775 | stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
488f131b JB |
1776 | |
1777 | ecs->stop_func_start = 0; | |
1778 | ecs->stop_func_end = 0; | |
1779 | ecs->stop_func_name = 0; | |
1780 | /* Don't care about return value; stop_func_start and stop_func_name | |
1781 | will both be 0 if it doesn't work. */ | |
1782 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1783 | &ecs->stop_func_start, &ecs->stop_func_end); | |
782263ab | 1784 | ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET; |
488f131b JB |
1785 | ecs->another_trap = 0; |
1786 | bpstat_clear (&stop_bpstat); | |
1787 | stop_step = 0; | |
1788 | stop_stack_dummy = 0; | |
1789 | stop_print_frame = 1; | |
1790 | ecs->random_signal = 0; | |
1791 | stopped_by_random_signal = 0; | |
1792 | breakpoints_failed = 0; | |
1793 | ||
3352ef37 AC |
1794 | if (stop_signal == TARGET_SIGNAL_TRAP |
1795 | && trap_expected | |
1796 | && gdbarch_single_step_through_delay_p (current_gdbarch) | |
1797 | && currently_stepping (ecs)) | |
1798 | { | |
1799 | /* We're trying to step of a breakpoint. Turns out that we're | |
1800 | also on an instruction that needs to be stepped multiple | |
1801 | times before it's been fully executing. E.g., architectures | |
1802 | with a delay slot. It needs to be stepped twice, once for | |
1803 | the instruction and once for the delay slot. */ | |
1804 | int step_through_delay | |
1805 | = gdbarch_single_step_through_delay (current_gdbarch, | |
1806 | get_current_frame ()); | |
527159b7 RC |
1807 | if (debug_infrun && step_through_delay) |
1808 | printf_unfiltered ("infrun: step through delay\n"); | |
3352ef37 AC |
1809 | if (step_range_end == 0 && step_through_delay) |
1810 | { | |
1811 | /* The user issued a continue when stopped at a breakpoint. | |
1812 | Set up for another trap and get out of here. */ | |
1813 | ecs->another_trap = 1; | |
1814 | keep_going (ecs); | |
1815 | return; | |
1816 | } | |
1817 | else if (step_through_delay) | |
1818 | { | |
1819 | /* The user issued a step when stopped at a breakpoint. | |
1820 | Maybe we should stop, maybe we should not - the delay | |
1821 | slot *might* correspond to a line of source. In any | |
1822 | case, don't decide that here, just set ecs->another_trap, | |
1823 | making sure we single-step again before breakpoints are | |
1824 | re-inserted. */ | |
1825 | ecs->another_trap = 1; | |
1826 | } | |
1827 | } | |
1828 | ||
488f131b JB |
1829 | /* Look at the cause of the stop, and decide what to do. |
1830 | The alternatives are: | |
1831 | 1) break; to really stop and return to the debugger, | |
1832 | 2) drop through to start up again | |
1833 | (set ecs->another_trap to 1 to single step once) | |
1834 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1835 | will be made according to the signal handling tables. */ | |
1836 | ||
1837 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1838 | that have to do with the program's own actions. Note that |
1839 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1840 | on the operating system version. Here we detect when a SIGILL or | |
1841 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1842 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1843 | when we're trying to execute a breakpoint instruction on a | |
1844 | non-executable stack. This happens for call dummy breakpoints | |
1845 | for architectures like SPARC that place call dummies on the | |
1846 | stack. */ | |
488f131b JB |
1847 | |
1848 | if (stop_signal == TARGET_SIGNAL_TRAP | |
8fb3e588 AC |
1849 | || (breakpoints_inserted |
1850 | && (stop_signal == TARGET_SIGNAL_ILL | |
1851 | || stop_signal == TARGET_SIGNAL_SEGV | |
1852 | || stop_signal == TARGET_SIGNAL_EMT)) | |
1853 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1854 | { |
1855 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1856 | { | |
527159b7 RC |
1857 | if (debug_infrun) |
1858 | printf_unfiltered ("infrun: stopped\n"); | |
488f131b JB |
1859 | stop_print_frame = 0; |
1860 | stop_stepping (ecs); | |
1861 | return; | |
1862 | } | |
c54cfec8 EZ |
1863 | |
1864 | /* This is originated from start_remote(), start_inferior() and | |
1865 | shared libraries hook functions. */ | |
c0236d92 | 1866 | if (stop_soon == STOP_QUIETLY) |
488f131b | 1867 | { |
527159b7 RC |
1868 | if (debug_infrun) |
1869 | printf_unfiltered ("infrun: quietly stopped\n"); | |
488f131b JB |
1870 | stop_stepping (ecs); |
1871 | return; | |
1872 | } | |
1873 | ||
c54cfec8 EZ |
1874 | /* This originates from attach_command(). We need to overwrite |
1875 | the stop_signal here, because some kernels don't ignore a | |
1876 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1877 | See more comments in inferior.h. */ | |
c0236d92 | 1878 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1879 | { |
1880 | stop_stepping (ecs); | |
1881 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1882 | stop_signal = TARGET_SIGNAL_0; | |
1883 | return; | |
1884 | } | |
1885 | ||
d303a6c7 AC |
1886 | /* Don't even think about breakpoints if just proceeded over a |
1887 | breakpoint. */ | |
1888 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) | |
527159b7 RC |
1889 | { |
1890 | if (debug_infrun) | |
1891 | printf_unfiltered ("infrun: trap expected\n"); | |
1892 | bpstat_clear (&stop_bpstat); | |
1893 | } | |
488f131b JB |
1894 | else |
1895 | { | |
1896 | /* See if there is a breakpoint at the current PC. */ | |
8fb3e588 | 1897 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
00d4360e | 1898 | stopped_by_watchpoint); |
488f131b | 1899 | |
488f131b JB |
1900 | /* Following in case break condition called a |
1901 | function. */ | |
1902 | stop_print_frame = 1; | |
1903 | } | |
1904 | ||
73dd234f | 1905 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
1906 | at one stage in the past included checks for an inferior |
1907 | function call's call dummy's return breakpoint. The original | |
1908 | comment, that went with the test, read: | |
73dd234f | 1909 | |
8fb3e588 AC |
1910 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
1911 | another signal besides SIGTRAP, so check here as well as | |
1912 | above.'' | |
73dd234f AC |
1913 | |
1914 | If someone ever tries to get get call dummys on a | |
1915 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
1916 | with something like a SIGSEGV), then those tests might need |
1917 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 1918 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
1919 | suspect that it won't be the case. |
1920 | ||
8fb3e588 AC |
1921 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
1922 | be necessary for call dummies on a non-executable stack on | |
1923 | SPARC. */ | |
73dd234f | 1924 | |
488f131b JB |
1925 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1926 | ecs->random_signal | |
1927 | = !(bpstat_explains_signal (stop_bpstat) | |
1928 | || trap_expected | |
488f131b | 1929 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
1930 | else |
1931 | { | |
73dd234f | 1932 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
1933 | if (!ecs->random_signal) |
1934 | stop_signal = TARGET_SIGNAL_TRAP; | |
1935 | } | |
1936 | } | |
1937 | ||
1938 | /* When we reach this point, we've pretty much decided | |
1939 | that the reason for stopping must've been a random | |
1940 | (unexpected) signal. */ | |
1941 | ||
1942 | else | |
1943 | ecs->random_signal = 1; | |
488f131b | 1944 | |
04e68871 | 1945 | process_event_stop_test: |
488f131b JB |
1946 | /* For the program's own signals, act according to |
1947 | the signal handling tables. */ | |
1948 | ||
1949 | if (ecs->random_signal) | |
1950 | { | |
1951 | /* Signal not for debugging purposes. */ | |
1952 | int printed = 0; | |
1953 | ||
527159b7 RC |
1954 | if (debug_infrun) |
1955 | printf_unfiltered ("infrun: random signal %d\n", stop_signal); | |
1956 | ||
488f131b JB |
1957 | stopped_by_random_signal = 1; |
1958 | ||
1959 | if (signal_print[stop_signal]) | |
1960 | { | |
1961 | printed = 1; | |
1962 | target_terminal_ours_for_output (); | |
1963 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
1964 | } | |
1965 | if (signal_stop[stop_signal]) | |
1966 | { | |
1967 | stop_stepping (ecs); | |
1968 | return; | |
1969 | } | |
1970 | /* If not going to stop, give terminal back | |
1971 | if we took it away. */ | |
1972 | else if (printed) | |
1973 | target_terminal_inferior (); | |
1974 | ||
1975 | /* Clear the signal if it should not be passed. */ | |
1976 | if (signal_program[stop_signal] == 0) | |
1977 | stop_signal = TARGET_SIGNAL_0; | |
1978 | ||
68f53502 AC |
1979 | if (prev_pc == read_pc () |
1980 | && !breakpoints_inserted | |
1981 | && breakpoint_here_p (read_pc ()) | |
1982 | && step_resume_breakpoint == NULL) | |
1983 | { | |
1984 | /* We were just starting a new sequence, attempting to | |
1985 | single-step off of a breakpoint and expecting a SIGTRAP. | |
1986 | Intead this signal arrives. This signal will take us out | |
1987 | of the stepping range so GDB needs to remember to, when | |
1988 | the signal handler returns, resume stepping off that | |
1989 | breakpoint. */ | |
1990 | /* To simplify things, "continue" is forced to use the same | |
1991 | code paths as single-step - set a breakpoint at the | |
1992 | signal return address and then, once hit, step off that | |
1993 | breakpoint. */ | |
44cbf7b5 | 1994 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
68f53502 AC |
1995 | ecs->step_after_step_resume_breakpoint = 1; |
1996 | } | |
1997 | else if (step_range_end != 0 | |
1998 | && stop_signal != TARGET_SIGNAL_0 | |
1999 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
2000 | && frame_id_eq (get_frame_id (get_current_frame ()), | |
2001 | step_frame_id)) | |
d303a6c7 AC |
2002 | { |
2003 | /* The inferior is about to take a signal that will take it | |
2004 | out of the single step range. Set a breakpoint at the | |
2005 | current PC (which is presumably where the signal handler | |
2006 | will eventually return) and then allow the inferior to | |
2007 | run free. | |
2008 | ||
2009 | Note that this is only needed for a signal delivered | |
2010 | while in the single-step range. Nested signals aren't a | |
2011 | problem as they eventually all return. */ | |
44cbf7b5 | 2012 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
d303a6c7 | 2013 | } |
488f131b JB |
2014 | keep_going (ecs); |
2015 | return; | |
2016 | } | |
2017 | ||
2018 | /* Handle cases caused by hitting a breakpoint. */ | |
2019 | { | |
2020 | CORE_ADDR jmp_buf_pc; | |
2021 | struct bpstat_what what; | |
2022 | ||
2023 | what = bpstat_what (stop_bpstat); | |
2024 | ||
2025 | if (what.call_dummy) | |
2026 | { | |
2027 | stop_stack_dummy = 1; | |
c5aa993b | 2028 | } |
c906108c | 2029 | |
488f131b | 2030 | switch (what.main_action) |
c5aa993b | 2031 | { |
488f131b JB |
2032 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2033 | /* If we hit the breakpoint at longjmp, disable it for the | |
2034 | duration of this command. Then, install a temporary | |
2035 | breakpoint at the target of the jmp_buf. */ | |
527159b7 RC |
2036 | if (debug_infrun) |
2037 | printf_unfiltered ("infrun: BPSTATE_WHAT_SET_LONGJMP_RESUME\n"); | |
488f131b JB |
2038 | disable_longjmp_breakpoint (); |
2039 | remove_breakpoints (); | |
2040 | breakpoints_inserted = 0; | |
2041 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 2042 | { |
488f131b | 2043 | keep_going (ecs); |
104c1213 | 2044 | return; |
c5aa993b | 2045 | } |
488f131b JB |
2046 | |
2047 | /* Need to blow away step-resume breakpoint, as it | |
2048 | interferes with us */ | |
2049 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2050 | { |
488f131b | 2051 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2052 | } |
c906108c | 2053 | |
8fb3e588 | 2054 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2055 | ecs->handling_longjmp = 1; /* FIXME */ |
2056 | keep_going (ecs); | |
2057 | return; | |
c906108c | 2058 | |
488f131b JB |
2059 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2060 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
527159b7 RC |
2061 | if (debug_infrun) |
2062 | printf_unfiltered ("infrun: BPSTATE_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
488f131b JB |
2063 | remove_breakpoints (); |
2064 | breakpoints_inserted = 0; | |
488f131b JB |
2065 | disable_longjmp_breakpoint (); |
2066 | ecs->handling_longjmp = 0; /* FIXME */ | |
2067 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2068 | break; | |
2069 | /* else fallthrough */ | |
2070 | ||
2071 | case BPSTAT_WHAT_SINGLE: | |
527159b7 RC |
2072 | if (debug_infrun) |
2073 | printf_unfiltered ("infrun: BPSTATE_WHAT_SINGLE\n"); | |
488f131b | 2074 | if (breakpoints_inserted) |
c5aa993b | 2075 | { |
488f131b | 2076 | remove_breakpoints (); |
c5aa993b | 2077 | } |
488f131b JB |
2078 | breakpoints_inserted = 0; |
2079 | ecs->another_trap = 1; | |
2080 | /* Still need to check other stuff, at least the case | |
2081 | where we are stepping and step out of the right range. */ | |
2082 | break; | |
c906108c | 2083 | |
488f131b | 2084 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 RC |
2085 | if (debug_infrun) |
2086 | printf_unfiltered ("infrun: BPSTATE_WHAT_STOP_NOISY\n"); | |
488f131b | 2087 | stop_print_frame = 1; |
c906108c | 2088 | |
d303a6c7 AC |
2089 | /* We are about to nuke the step_resume_breakpointt via the |
2090 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2091 | |
488f131b JB |
2092 | stop_stepping (ecs); |
2093 | return; | |
c5aa993b | 2094 | |
488f131b | 2095 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 RC |
2096 | if (debug_infrun) |
2097 | printf_unfiltered ("infrun: BPSTATE_WHAT_STOP_SILENT\n"); | |
488f131b | 2098 | stop_print_frame = 0; |
c5aa993b | 2099 | |
d303a6c7 AC |
2100 | /* We are about to nuke the step_resume_breakpoin via the |
2101 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2102 | |
488f131b | 2103 | stop_stepping (ecs); |
e441088d | 2104 | return; |
c5aa993b | 2105 | |
488f131b JB |
2106 | case BPSTAT_WHAT_STEP_RESUME: |
2107 | /* This proably demands a more elegant solution, but, yeah | |
2108 | right... | |
c5aa993b | 2109 | |
488f131b JB |
2110 | This function's use of the simple variable |
2111 | step_resume_breakpoint doesn't seem to accomodate | |
2112 | simultaneously active step-resume bp's, although the | |
2113 | breakpoint list certainly can. | |
c5aa993b | 2114 | |
488f131b JB |
2115 | If we reach here and step_resume_breakpoint is already |
2116 | NULL, then apparently we have multiple active | |
2117 | step-resume bp's. We'll just delete the breakpoint we | |
2118 | stopped at, and carry on. | |
2119 | ||
2120 | Correction: what the code currently does is delete a | |
2121 | step-resume bp, but it makes no effort to ensure that | |
2122 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2123 | |
527159b7 RC |
2124 | if (debug_infrun) |
2125 | printf_unfiltered ("infrun: BPSTATE_WHAT_STEP_RESUME\n"); | |
2126 | ||
488f131b JB |
2127 | if (step_resume_breakpoint == NULL) |
2128 | { | |
2129 | step_resume_breakpoint = | |
2130 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2131 | } | |
2132 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
68f53502 AC |
2133 | if (ecs->step_after_step_resume_breakpoint) |
2134 | { | |
2135 | /* Back when the step-resume breakpoint was inserted, we | |
2136 | were trying to single-step off a breakpoint. Go back | |
2137 | to doing that. */ | |
2138 | ecs->step_after_step_resume_breakpoint = 0; | |
2139 | remove_breakpoints (); | |
2140 | breakpoints_inserted = 0; | |
2141 | ecs->another_trap = 1; | |
2142 | keep_going (ecs); | |
2143 | return; | |
2144 | } | |
488f131b JB |
2145 | break; |
2146 | ||
2147 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
527159b7 RC |
2148 | if (debug_infrun) |
2149 | printf_unfiltered ("infrun: BPSTATE_WHAT_THROUGH_SIGTRAMP\n"); | |
488f131b JB |
2150 | /* If were waiting for a trap, hitting the step_resume_break |
2151 | doesn't count as getting it. */ | |
2152 | if (trap_expected) | |
2153 | ecs->another_trap = 1; | |
2154 | break; | |
2155 | ||
2156 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2157 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2158 | #ifdef SOLIB_ADD | |
c906108c | 2159 | { |
527159b7 RC |
2160 | if (debug_infrun) |
2161 | printf_unfiltered ("infrun: BPSTATE_WHAT_CHECK_SHLIBS\n"); | |
488f131b JB |
2162 | /* Remove breakpoints, we eventually want to step over the |
2163 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2164 | breakpoint addresses via breakpoint_re_set. */ | |
2165 | if (breakpoints_inserted) | |
2166 | remove_breakpoints (); | |
c5aa993b | 2167 | breakpoints_inserted = 0; |
488f131b JB |
2168 | |
2169 | /* Check for any newly added shared libraries if we're | |
2170 | supposed to be adding them automatically. Switch | |
2171 | terminal for any messages produced by | |
2172 | breakpoint_re_set. */ | |
2173 | target_terminal_ours_for_output (); | |
aff6338a | 2174 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
2175 | stack's section table is kept up-to-date. Architectures, |
2176 | (e.g., PPC64), use the section table to perform | |
2177 | operations such as address => section name and hence | |
2178 | require the table to contain all sections (including | |
2179 | those found in shared libraries). */ | |
aff6338a | 2180 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
2181 | exec_ops to SOLIB_ADD. This is because current GDB is |
2182 | only tooled to propagate section_table changes out from | |
2183 | the "current_target" (see target_resize_to_sections), and | |
2184 | not up from the exec stratum. This, of course, isn't | |
2185 | right. "infrun.c" should only interact with the | |
2186 | exec/process stratum, instead relying on the target stack | |
2187 | to propagate relevant changes (stop, section table | |
2188 | changed, ...) up to other layers. */ | |
aff6338a | 2189 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
2190 | target_terminal_inferior (); |
2191 | ||
2192 | /* Try to reenable shared library breakpoints, additional | |
2193 | code segments in shared libraries might be mapped in now. */ | |
2194 | re_enable_breakpoints_in_shlibs (); | |
2195 | ||
2196 | /* If requested, stop when the dynamic linker notifies | |
2197 | gdb of events. This allows the user to get control | |
2198 | and place breakpoints in initializer routines for | |
2199 | dynamically loaded objects (among other things). */ | |
877522db | 2200 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2201 | { |
488f131b | 2202 | stop_stepping (ecs); |
d4f3574e SS |
2203 | return; |
2204 | } | |
c5aa993b | 2205 | |
488f131b JB |
2206 | /* If we stopped due to an explicit catchpoint, then the |
2207 | (see above) call to SOLIB_ADD pulled in any symbols | |
2208 | from a newly-loaded library, if appropriate. | |
2209 | ||
2210 | We do want the inferior to stop, but not where it is | |
2211 | now, which is in the dynamic linker callback. Rather, | |
2212 | we would like it stop in the user's program, just after | |
2213 | the call that caused this catchpoint to trigger. That | |
2214 | gives the user a more useful vantage from which to | |
2215 | examine their program's state. */ | |
8fb3e588 AC |
2216 | else if (what.main_action |
2217 | == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2218 | { |
488f131b JB |
2219 | /* ??rehrauer: If I could figure out how to get the |
2220 | right return PC from here, we could just set a temp | |
2221 | breakpoint and resume. I'm not sure we can without | |
2222 | cracking open the dld's shared libraries and sniffing | |
2223 | their unwind tables and text/data ranges, and that's | |
2224 | not a terribly portable notion. | |
2225 | ||
2226 | Until that time, we must step the inferior out of the | |
2227 | dld callback, and also out of the dld itself (and any | |
2228 | code or stubs in libdld.sl, such as "shl_load" and | |
2229 | friends) until we reach non-dld code. At that point, | |
2230 | we can stop stepping. */ | |
2231 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2232 | &ecs-> | |
2233 | stepping_through_solib_catchpoints); | |
2234 | ecs->stepping_through_solib_after_catch = 1; | |
2235 | ||
2236 | /* Be sure to lift all breakpoints, so the inferior does | |
2237 | actually step past this point... */ | |
2238 | ecs->another_trap = 1; | |
2239 | break; | |
c906108c | 2240 | } |
c5aa993b | 2241 | else |
c5aa993b | 2242 | { |
488f131b | 2243 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2244 | ecs->another_trap = 1; |
488f131b | 2245 | break; |
c5aa993b | 2246 | } |
488f131b JB |
2247 | } |
2248 | #endif | |
2249 | break; | |
c906108c | 2250 | |
488f131b JB |
2251 | case BPSTAT_WHAT_LAST: |
2252 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2253 | |
488f131b JB |
2254 | case BPSTAT_WHAT_KEEP_CHECKING: |
2255 | break; | |
2256 | } | |
2257 | } | |
c906108c | 2258 | |
488f131b JB |
2259 | /* We come here if we hit a breakpoint but should not |
2260 | stop for it. Possibly we also were stepping | |
2261 | and should stop for that. So fall through and | |
2262 | test for stepping. But, if not stepping, | |
2263 | do not stop. */ | |
c906108c | 2264 | |
488f131b JB |
2265 | /* Are we stepping to get the inferior out of the dynamic |
2266 | linker's hook (and possibly the dld itself) after catching | |
2267 | a shlib event? */ | |
2268 | if (ecs->stepping_through_solib_after_catch) | |
2269 | { | |
2270 | #if defined(SOLIB_ADD) | |
2271 | /* Have we reached our destination? If not, keep going. */ | |
2272 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2273 | { | |
527159b7 RC |
2274 | if (debug_infrun) |
2275 | printf_unfiltered ("infrun: stepping in dynamic linker\n"); | |
488f131b JB |
2276 | ecs->another_trap = 1; |
2277 | keep_going (ecs); | |
104c1213 | 2278 | return; |
488f131b JB |
2279 | } |
2280 | #endif | |
527159b7 RC |
2281 | if (debug_infrun) |
2282 | printf_unfiltered ("infrun: step past dynamic linker\n"); | |
488f131b JB |
2283 | /* Else, stop and report the catchpoint(s) whose triggering |
2284 | caused us to begin stepping. */ | |
2285 | ecs->stepping_through_solib_after_catch = 0; | |
2286 | bpstat_clear (&stop_bpstat); | |
2287 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2288 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2289 | stop_print_frame = 1; | |
2290 | stop_stepping (ecs); | |
2291 | return; | |
2292 | } | |
c906108c | 2293 | |
488f131b JB |
2294 | if (step_resume_breakpoint) |
2295 | { | |
527159b7 RC |
2296 | if (debug_infrun) |
2297 | printf_unfiltered ("infrun: step-resume breakpoint\n"); | |
2298 | ||
488f131b JB |
2299 | /* Having a step-resume breakpoint overrides anything |
2300 | else having to do with stepping commands until | |
2301 | that breakpoint is reached. */ | |
488f131b JB |
2302 | keep_going (ecs); |
2303 | return; | |
2304 | } | |
c5aa993b | 2305 | |
488f131b JB |
2306 | if (step_range_end == 0) |
2307 | { | |
527159b7 RC |
2308 | if (debug_infrun) |
2309 | printf_unfiltered ("infrun: no stepping, continue\n"); | |
488f131b | 2310 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
2311 | keep_going (ecs); |
2312 | return; | |
2313 | } | |
c5aa993b | 2314 | |
488f131b | 2315 | /* If stepping through a line, keep going if still within it. |
c906108c | 2316 | |
488f131b JB |
2317 | Note that step_range_end is the address of the first instruction |
2318 | beyond the step range, and NOT the address of the last instruction | |
2319 | within it! */ | |
2320 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2321 | { | |
527159b7 RC |
2322 | if (debug_infrun) |
2323 | printf_unfiltered ("infrun: stepping inside range [0x%s-0x%s]\n", | |
2324 | paddr_nz (step_range_start), | |
2325 | paddr_nz (step_range_end)); | |
488f131b JB |
2326 | keep_going (ecs); |
2327 | return; | |
2328 | } | |
c5aa993b | 2329 | |
488f131b | 2330 | /* We stepped out of the stepping range. */ |
c906108c | 2331 | |
488f131b JB |
2332 | /* If we are stepping at the source level and entered the runtime |
2333 | loader dynamic symbol resolution code, we keep on single stepping | |
2334 | until we exit the run time loader code and reach the callee's | |
2335 | address. */ | |
2336 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2337 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2338 | { | |
4c8c40e6 MK |
2339 | CORE_ADDR pc_after_resolver = |
2340 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2341 | |
527159b7 RC |
2342 | if (debug_infrun) |
2343 | printf_unfiltered ("infrun: stepped into dynsym resolve code\n"); | |
2344 | ||
488f131b JB |
2345 | if (pc_after_resolver) |
2346 | { | |
2347 | /* Set up a step-resume breakpoint at the address | |
2348 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2349 | struct symtab_and_line sr_sal; | |
fe39c653 | 2350 | init_sal (&sr_sal); |
488f131b JB |
2351 | sr_sal.pc = pc_after_resolver; |
2352 | ||
44cbf7b5 | 2353 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c5aa993b | 2354 | } |
c906108c | 2355 | |
488f131b JB |
2356 | keep_going (ecs); |
2357 | return; | |
2358 | } | |
c906108c | 2359 | |
42edda50 AC |
2360 | if (step_range_end != 1 |
2361 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2362 | || step_over_calls == STEP_OVER_ALL) | |
2363 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 2364 | { |
527159b7 RC |
2365 | if (debug_infrun) |
2366 | printf_unfiltered ("infrun: stepped into signal trampoline\n"); | |
42edda50 | 2367 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
2368 | a signal trampoline (either by a signal being delivered or by |
2369 | the signal handler returning). Just single-step until the | |
2370 | inferior leaves the trampoline (either by calling the handler | |
2371 | or returning). */ | |
488f131b JB |
2372 | keep_going (ecs); |
2373 | return; | |
2374 | } | |
c906108c | 2375 | |
8fb3e588 | 2376 | if (frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) |
488f131b JB |
2377 | { |
2378 | /* It's a subroutine call. */ | |
95918acb | 2379 | CORE_ADDR real_stop_pc; |
8fb3e588 | 2380 | |
527159b7 RC |
2381 | if (debug_infrun) |
2382 | printf_unfiltered ("infrun: stepped into subroutine\n"); | |
2383 | ||
95918acb AC |
2384 | if ((step_over_calls == STEP_OVER_NONE) |
2385 | || ((step_range_end == 1) | |
2386 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2387 | { | |
2388 | /* I presume that step_over_calls is only 0 when we're | |
2389 | supposed to be stepping at the assembly language level | |
2390 | ("stepi"). Just stop. */ | |
2391 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
2392 | thought it was a subroutine call but it was not. Stop as | |
2393 | well. FENN */ | |
2394 | stop_step = 1; | |
2395 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2396 | stop_stepping (ecs); | |
2397 | return; | |
2398 | } | |
8fb3e588 | 2399 | |
8567c30f AC |
2400 | if (step_over_calls == STEP_OVER_ALL) |
2401 | { | |
2402 | /* We're doing a "next", set a breakpoint at callee's return | |
2403 | address (the address at which the caller will | |
2404 | resume). */ | |
44cbf7b5 | 2405 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
8567c30f AC |
2406 | keep_going (ecs); |
2407 | return; | |
2408 | } | |
a53c66de | 2409 | |
95918acb | 2410 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
2411 | calling routine and the real function), locate the real |
2412 | function. That's what tells us (a) whether we want to step | |
2413 | into it at all, and (b) what prologue we want to run to the | |
2414 | end of, if we do step into it. */ | |
95918acb AC |
2415 | real_stop_pc = skip_language_trampoline (stop_pc); |
2416 | if (real_stop_pc == 0) | |
2417 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2418 | if (real_stop_pc != 0) | |
2419 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 2420 | |
1b2bfbb9 RC |
2421 | if (IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start)) |
2422 | { | |
2423 | struct symtab_and_line sr_sal; | |
2424 | init_sal (&sr_sal); | |
2425 | sr_sal.pc = ecs->stop_func_start; | |
2426 | ||
44cbf7b5 | 2427 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
8fb3e588 AC |
2428 | keep_going (ecs); |
2429 | return; | |
1b2bfbb9 RC |
2430 | } |
2431 | ||
95918acb | 2432 | /* If we have line number information for the function we are |
8fb3e588 | 2433 | thinking of stepping into, step into it. |
95918acb | 2434 | |
8fb3e588 AC |
2435 | If there are several symtabs at that PC (e.g. with include |
2436 | files), just want to know whether *any* of them have line | |
2437 | numbers. find_pc_line handles this. */ | |
95918acb AC |
2438 | { |
2439 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 2440 | |
95918acb AC |
2441 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2442 | if (tmp_sal.line != 0) | |
2443 | { | |
2444 | step_into_function (ecs); | |
2445 | return; | |
2446 | } | |
2447 | } | |
2448 | ||
2449 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
2450 | set, we stop the step so that the user has a chance to switch |
2451 | in assembly mode. */ | |
95918acb AC |
2452 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
2453 | { | |
2454 | stop_step = 1; | |
2455 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2456 | stop_stepping (ecs); | |
2457 | return; | |
2458 | } | |
2459 | ||
2460 | /* Set a breakpoint at callee's return address (the address at | |
8fb3e588 | 2461 | which the caller will resume). */ |
44cbf7b5 | 2462 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
95918acb | 2463 | keep_going (ecs); |
488f131b | 2464 | return; |
488f131b | 2465 | } |
c906108c | 2466 | |
488f131b JB |
2467 | /* If we're in the return path from a shared library trampoline, |
2468 | we want to proceed through the trampoline when stepping. */ | |
2469 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2470 | { | |
488f131b | 2471 | /* Determine where this trampoline returns. */ |
5cf4d23a | 2472 | CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
c906108c | 2473 | |
527159b7 RC |
2474 | if (debug_infrun) |
2475 | printf_unfiltered ("infrun: stepped into solib return tramp\n"); | |
2476 | ||
488f131b | 2477 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2478 | if (real_stop_pc) |
488f131b JB |
2479 | { |
2480 | /* And put the step-breakpoint there and go until there. */ | |
2481 | struct symtab_and_line sr_sal; | |
2482 | ||
fe39c653 | 2483 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2484 | sr_sal.pc = real_stop_pc; |
488f131b | 2485 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
44cbf7b5 AC |
2486 | |
2487 | /* Do not specify what the fp should be when we stop since | |
2488 | on some machines the prologue is where the new fp value | |
2489 | is established. */ | |
2490 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
c906108c | 2491 | |
488f131b JB |
2492 | /* Restart without fiddling with the step ranges or |
2493 | other state. */ | |
2494 | keep_going (ecs); | |
2495 | return; | |
2496 | } | |
2497 | } | |
c906108c | 2498 | |
1b2bfbb9 RC |
2499 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
2500 | the trampoline processing logic, however, there are some trampolines | |
2501 | that have no names, so we should do trampoline handling first. */ | |
2502 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2503 | && ecs->stop_func_name == NULL) | |
2504 | { | |
527159b7 RC |
2505 | if (debug_infrun) |
2506 | printf_unfiltered ("infrun: stepped into undebuggable function\n"); | |
2507 | ||
1b2bfbb9 RC |
2508 | /* The inferior just stepped into, or returned to, an |
2509 | undebuggable function (where there is no symbol, not even a | |
2510 | minimal symbol, corresponding to the address where the | |
2511 | inferior stopped). Since we want to skip this kind of code, | |
2512 | we keep going until the inferior returns from this | |
2513 | function. */ | |
2514 | if (step_stop_if_no_debug) | |
2515 | { | |
2516 | /* If we have no line number and the step-stop-if-no-debug | |
2517 | is set, we stop the step so that the user has a chance to | |
2518 | switch in assembly mode. */ | |
2519 | stop_step = 1; | |
2520 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2521 | stop_stepping (ecs); | |
2522 | return; | |
2523 | } | |
2524 | else | |
2525 | { | |
2526 | /* Set a breakpoint at callee's return address (the address | |
2527 | at which the caller will resume). */ | |
44cbf7b5 | 2528 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
1b2bfbb9 RC |
2529 | keep_going (ecs); |
2530 | return; | |
2531 | } | |
2532 | } | |
2533 | ||
2534 | if (step_range_end == 1) | |
2535 | { | |
2536 | /* It is stepi or nexti. We always want to stop stepping after | |
2537 | one instruction. */ | |
527159b7 RC |
2538 | if (debug_infrun) |
2539 | printf_unfiltered ("infrun: stepi/nexti\n"); | |
1b2bfbb9 RC |
2540 | stop_step = 1; |
2541 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2542 | stop_stepping (ecs); | |
2543 | return; | |
2544 | } | |
2545 | ||
2546 | ecs->sal = find_pc_line (stop_pc, 0); | |
2547 | ||
488f131b JB |
2548 | if (ecs->sal.line == 0) |
2549 | { | |
2550 | /* We have no line number information. That means to stop | |
2551 | stepping (does this always happen right after one instruction, | |
2552 | when we do "s" in a function with no line numbers, | |
2553 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 RC |
2554 | if (debug_infrun) |
2555 | printf_unfiltered ("infrun: no line number info\n"); | |
488f131b JB |
2556 | stop_step = 1; |
2557 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2558 | stop_stepping (ecs); | |
2559 | return; | |
2560 | } | |
c906108c | 2561 | |
488f131b JB |
2562 | if ((stop_pc == ecs->sal.pc) |
2563 | && (ecs->current_line != ecs->sal.line | |
2564 | || ecs->current_symtab != ecs->sal.symtab)) | |
2565 | { | |
2566 | /* We are at the start of a different line. So stop. Note that | |
2567 | we don't stop if we step into the middle of a different line. | |
2568 | That is said to make things like for (;;) statements work | |
2569 | better. */ | |
527159b7 RC |
2570 | if (debug_infrun) |
2571 | printf_unfiltered ("infrun: stepped to a different line\n"); | |
488f131b JB |
2572 | stop_step = 1; |
2573 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2574 | stop_stepping (ecs); | |
2575 | return; | |
2576 | } | |
c906108c | 2577 | |
488f131b | 2578 | /* We aren't done stepping. |
c906108c | 2579 | |
488f131b JB |
2580 | Optimize by setting the stepping range to the line. |
2581 | (We might not be in the original line, but if we entered a | |
2582 | new line in mid-statement, we continue stepping. This makes | |
2583 | things like for(;;) statements work better.) */ | |
c906108c | 2584 | |
488f131b | 2585 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2586 | { |
488f131b JB |
2587 | /* If this is the last line of the function, don't keep stepping |
2588 | (it would probably step us out of the function). | |
2589 | This is particularly necessary for a one-line function, | |
2590 | in which after skipping the prologue we better stop even though | |
2591 | we will be in mid-line. */ | |
527159b7 RC |
2592 | if (debug_infrun) |
2593 | printf_unfiltered ("infrun: stepped to a different function\n"); | |
488f131b JB |
2594 | stop_step = 1; |
2595 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2596 | stop_stepping (ecs); | |
2597 | return; | |
c5aa993b | 2598 | } |
488f131b JB |
2599 | step_range_start = ecs->sal.pc; |
2600 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2601 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2602 | ecs->current_line = ecs->sal.line; |
2603 | ecs->current_symtab = ecs->sal.symtab; | |
2604 | ||
aa0cd9c1 AC |
2605 | /* In the case where we just stepped out of a function into the |
2606 | middle of a line of the caller, continue stepping, but | |
2607 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2608 | #if 0 |
2609 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2610 | generous. It will trigger on things like a step into a frameless | |
2611 | stackless leaf function. I think the logic should instead look | |
2612 | at the unwound frame ID has that should give a more robust | |
2613 | indication of what happened. */ | |
8fb3e588 AC |
2614 | if (step - ID == current - ID) |
2615 | still stepping in same function; | |
2616 | else if (step - ID == unwind (current - ID)) | |
2617 | stepped into a function; | |
2618 | else | |
2619 | stepped out of a function; | |
2620 | /* Of course this assumes that the frame ID unwind code is robust | |
2621 | and we're willing to introduce frame unwind logic into this | |
2622 | function. Fortunately, those days are nearly upon us. */ | |
65815ea1 | 2623 | #endif |
488f131b | 2624 | { |
aa0cd9c1 AC |
2625 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2626 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2627 | step_frame_id = current_frame; | |
488f131b | 2628 | } |
c906108c | 2629 | |
527159b7 RC |
2630 | if (debug_infrun) |
2631 | printf_unfiltered ("infrun: keep going\n"); | |
488f131b | 2632 | keep_going (ecs); |
104c1213 JM |
2633 | } |
2634 | ||
2635 | /* Are we in the middle of stepping? */ | |
2636 | ||
2637 | static int | |
2638 | currently_stepping (struct execution_control_state *ecs) | |
2639 | { | |
d303a6c7 | 2640 | return ((!ecs->handling_longjmp |
104c1213 JM |
2641 | && ((step_range_end && step_resume_breakpoint == NULL) |
2642 | || trap_expected)) | |
2643 | || ecs->stepping_through_solib_after_catch | |
2644 | || bpstat_should_step ()); | |
2645 | } | |
c906108c | 2646 | |
c2c6d25f JM |
2647 | /* Subroutine call with source code we should not step over. Do step |
2648 | to the first line of code in it. */ | |
2649 | ||
2650 | static void | |
2651 | step_into_function (struct execution_control_state *ecs) | |
2652 | { | |
2653 | struct symtab *s; | |
2654 | struct symtab_and_line sr_sal; | |
2655 | ||
2656 | s = find_pc_symtab (stop_pc); | |
2657 | if (s && s->language != language_asm) | |
2658 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2659 | ||
2660 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2661 | /* Use the step_resume_break to step until the end of the prologue, | |
2662 | even if that involves jumps (as it seems to on the vax under | |
2663 | 4.2). */ | |
2664 | /* If the prologue ends in the middle of a source line, continue to | |
2665 | the end of that source line (if it is still within the function). | |
2666 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2667 | if (ecs->sal.end |
2668 | && ecs->sal.pc != ecs->stop_func_start | |
2669 | && ecs->sal.end < ecs->stop_func_end) | |
2670 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2671 | |
2dbd5e30 KB |
2672 | /* Architectures which require breakpoint adjustment might not be able |
2673 | to place a breakpoint at the computed address. If so, the test | |
2674 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2675 | ecs->stop_func_start to an address at which a breakpoint may be | |
2676 | legitimately placed. | |
8fb3e588 | 2677 | |
2dbd5e30 KB |
2678 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
2679 | made, GDB will enter an infinite loop when stepping through | |
2680 | optimized code consisting of VLIW instructions which contain | |
2681 | subinstructions corresponding to different source lines. On | |
2682 | FR-V, it's not permitted to place a breakpoint on any but the | |
2683 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2684 | set, GDB will adjust the breakpoint address to the beginning of | |
2685 | the VLIW instruction. Thus, we need to make the corresponding | |
2686 | adjustment here when computing the stop address. */ | |
8fb3e588 | 2687 | |
2dbd5e30 KB |
2688 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
2689 | { | |
2690 | ecs->stop_func_start | |
2691 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
8fb3e588 | 2692 | ecs->stop_func_start); |
2dbd5e30 KB |
2693 | } |
2694 | ||
c2c6d25f JM |
2695 | if (ecs->stop_func_start == stop_pc) |
2696 | { | |
2697 | /* We are already there: stop now. */ | |
2698 | stop_step = 1; | |
488f131b | 2699 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2700 | stop_stepping (ecs); |
2701 | return; | |
2702 | } | |
2703 | else | |
2704 | { | |
2705 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2706 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2707 | sr_sal.pc = ecs->stop_func_start; |
2708 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
44cbf7b5 | 2709 | |
c2c6d25f | 2710 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
2711 | some machines the prologue is where the new fp value is |
2712 | established. */ | |
44cbf7b5 | 2713 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c2c6d25f JM |
2714 | |
2715 | /* And make sure stepping stops right away then. */ | |
2716 | step_range_end = step_range_start; | |
2717 | } | |
2718 | keep_going (ecs); | |
2719 | } | |
d4f3574e | 2720 | |
44cbf7b5 AC |
2721 | /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID. |
2722 | This is used to both functions and to skip over code. */ | |
2723 | ||
2724 | static void | |
2725 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
2726 | struct frame_id sr_id) | |
2727 | { | |
2728 | /* There should never be more than one step-resume breakpoint per | |
2729 | thread, so we should never be setting a new | |
2730 | step_resume_breakpoint when one is already active. */ | |
2731 | gdb_assert (step_resume_breakpoint == NULL); | |
2732 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, | |
2733 | bp_step_resume); | |
2734 | if (breakpoints_inserted) | |
2735 | insert_breakpoints (); | |
2736 | } | |
2737 | ||
7ce450bd AC |
2738 | /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used |
2739 | to skip a function (next, skip-no-debug) or signal. It's assumed | |
2740 | that the function/signal handler being skipped eventually returns | |
2741 | to the breakpoint inserted at RETURN_FRAME.pc. | |
2742 | ||
2743 | For the skip-function case, the function may have been reached by | |
2744 | either single stepping a call / return / signal-return instruction, | |
2745 | or by hitting a breakpoint. In all cases, the RETURN_FRAME belongs | |
2746 | to the skip-function's caller. | |
2747 | ||
2748 | For the signals case, this is called with the interrupted | |
2749 | function's frame. The signal handler, when it returns, will resume | |
2750 | the interrupted function at RETURN_FRAME.pc. */ | |
d303a6c7 AC |
2751 | |
2752 | static void | |
44cbf7b5 | 2753 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
2754 | { |
2755 | struct symtab_and_line sr_sal; | |
2756 | ||
d303a6c7 AC |
2757 | init_sal (&sr_sal); /* initialize to zeros */ |
2758 | ||
7ce450bd | 2759 | sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (return_frame)); |
d303a6c7 AC |
2760 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2761 | ||
44cbf7b5 | 2762 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
d303a6c7 AC |
2763 | } |
2764 | ||
104c1213 JM |
2765 | static void |
2766 | stop_stepping (struct execution_control_state *ecs) | |
2767 | { | |
527159b7 RC |
2768 | if (debug_infrun) |
2769 | printf_unfiltered ("infrun: stop_stepping\n"); | |
2770 | ||
cd0fc7c3 SS |
2771 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2772 | ecs->wait_some_more = 0; | |
2773 | } | |
2774 | ||
d4f3574e SS |
2775 | /* This function handles various cases where we need to continue |
2776 | waiting for the inferior. */ | |
2777 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2778 | ||
2779 | static void | |
2780 | keep_going (struct execution_control_state *ecs) | |
2781 | { | |
d4f3574e | 2782 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2783 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 2784 | |
d4f3574e SS |
2785 | /* If we did not do break;, it means we should keep running the |
2786 | inferior and not return to debugger. */ | |
2787 | ||
2788 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2789 | { | |
2790 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2791 | the inferior, else we'd have done a break above) and we |
2792 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2793 | resume (currently_stepping (ecs), stop_signal); |
2794 | } | |
2795 | else | |
2796 | { | |
2797 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2798 | anyway (the user asked that this signal be passed to the |
2799 | child) | |
2800 | -- or -- | |
2801 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2802 | decided we should resume from it. | |
d4f3574e | 2803 | |
68f53502 | 2804 | We're going to run this baby now! */ |
d4f3574e | 2805 | |
68f53502 | 2806 | if (!breakpoints_inserted && !ecs->another_trap) |
d4f3574e SS |
2807 | { |
2808 | breakpoints_failed = insert_breakpoints (); | |
2809 | if (breakpoints_failed) | |
2810 | { | |
2811 | stop_stepping (ecs); | |
2812 | return; | |
2813 | } | |
2814 | breakpoints_inserted = 1; | |
2815 | } | |
2816 | ||
2817 | trap_expected = ecs->another_trap; | |
2818 | ||
2819 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2820 | specifies that such a signal should be delivered to the |
2821 | target program). | |
2822 | ||
2823 | Typically, this would occure when a user is debugging a | |
2824 | target monitor on a simulator: the target monitor sets a | |
2825 | breakpoint; the simulator encounters this break-point and | |
2826 | halts the simulation handing control to GDB; GDB, noteing | |
2827 | that the break-point isn't valid, returns control back to the | |
2828 | simulator; the simulator then delivers the hardware | |
2829 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2830 | ||
2831 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2832 | stop_signal = TARGET_SIGNAL_0; |
2833 | ||
d4f3574e SS |
2834 | |
2835 | resume (currently_stepping (ecs), stop_signal); | |
2836 | } | |
2837 | ||
488f131b | 2838 | prepare_to_wait (ecs); |
d4f3574e SS |
2839 | } |
2840 | ||
104c1213 JM |
2841 | /* This function normally comes after a resume, before |
2842 | handle_inferior_event exits. It takes care of any last bits of | |
2843 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2844 | |
104c1213 JM |
2845 | static void |
2846 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2847 | { |
527159b7 RC |
2848 | if (debug_infrun) |
2849 | printf_unfiltered ("infrun: prepare_to_wait\n"); | |
104c1213 JM |
2850 | if (ecs->infwait_state == infwait_normal_state) |
2851 | { | |
2852 | overlay_cache_invalid = 1; | |
2853 | ||
2854 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2855 | target_wait because they can be loaded from the target while |
2856 | in target_wait. This makes remote debugging a bit more | |
2857 | efficient for those targets that provide critical registers | |
2858 | as part of their normal status mechanism. */ | |
104c1213 JM |
2859 | |
2860 | registers_changed (); | |
39f77062 | 2861 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2862 | ecs->wp = &(ecs->ws); |
2863 | } | |
2864 | /* This is the old end of the while loop. Let everybody know we | |
2865 | want to wait for the inferior some more and get called again | |
2866 | soon. */ | |
2867 | ecs->wait_some_more = 1; | |
c906108c | 2868 | } |
11cf8741 JM |
2869 | |
2870 | /* Print why the inferior has stopped. We always print something when | |
2871 | the inferior exits, or receives a signal. The rest of the cases are | |
2872 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2873 | there should be a call to this function from handle_inferior_event() | |
2874 | each time stop_stepping() is called.*/ | |
2875 | static void | |
2876 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2877 | { | |
2878 | switch (stop_reason) | |
2879 | { | |
2880 | case STOP_UNKNOWN: | |
2881 | /* We don't deal with these cases from handle_inferior_event() | |
2882 | yet. */ | |
2883 | break; | |
2884 | case END_STEPPING_RANGE: | |
2885 | /* We are done with a step/next/si/ni command. */ | |
2886 | /* For now print nothing. */ | |
fb40c209 | 2887 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2888 | operation for n > 1 */ |
fb40c209 | 2889 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2890 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2891 | ui_out_field_string (uiout, "reason", "end-stepping-range"); |
11cf8741 JM |
2892 | break; |
2893 | case BREAKPOINT_HIT: | |
2894 | /* We found a breakpoint. */ | |
2895 | /* For now print nothing. */ | |
2896 | break; | |
2897 | case SIGNAL_EXITED: | |
2898 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2899 | annotate_signalled (); |
9dc5e2a9 | 2900 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2901 | ui_out_field_string (uiout, "reason", "exited-signalled"); |
8b93c638 JM |
2902 | ui_out_text (uiout, "\nProgram terminated with signal "); |
2903 | annotate_signal_name (); | |
488f131b JB |
2904 | ui_out_field_string (uiout, "signal-name", |
2905 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2906 | annotate_signal_name_end (); |
2907 | ui_out_text (uiout, ", "); | |
2908 | annotate_signal_string (); | |
488f131b JB |
2909 | ui_out_field_string (uiout, "signal-meaning", |
2910 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2911 | annotate_signal_string_end (); |
2912 | ui_out_text (uiout, ".\n"); | |
2913 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
2914 | break; |
2915 | case EXITED: | |
2916 | /* The inferior program is finished. */ | |
8b93c638 JM |
2917 | annotate_exited (stop_info); |
2918 | if (stop_info) | |
2919 | { | |
9dc5e2a9 | 2920 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2921 | ui_out_field_string (uiout, "reason", "exited"); |
8b93c638 | 2922 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
2923 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
2924 | (unsigned int) stop_info); | |
8b93c638 JM |
2925 | ui_out_text (uiout, ".\n"); |
2926 | } | |
2927 | else | |
2928 | { | |
9dc5e2a9 | 2929 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2930 | ui_out_field_string (uiout, "reason", "exited-normally"); |
8b93c638 JM |
2931 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
2932 | } | |
11cf8741 JM |
2933 | break; |
2934 | case SIGNAL_RECEIVED: | |
2935 | /* Signal received. The signal table tells us to print about | |
2936 | it. */ | |
8b93c638 JM |
2937 | annotate_signal (); |
2938 | ui_out_text (uiout, "\nProgram received signal "); | |
2939 | annotate_signal_name (); | |
84c6c83c KS |
2940 | if (ui_out_is_mi_like_p (uiout)) |
2941 | ui_out_field_string (uiout, "reason", "signal-received"); | |
488f131b JB |
2942 | ui_out_field_string (uiout, "signal-name", |
2943 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2944 | annotate_signal_name_end (); |
2945 | ui_out_text (uiout, ", "); | |
2946 | annotate_signal_string (); | |
488f131b JB |
2947 | ui_out_field_string (uiout, "signal-meaning", |
2948 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2949 | annotate_signal_string_end (); |
2950 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
2951 | break; |
2952 | default: | |
8e65ff28 AC |
2953 | internal_error (__FILE__, __LINE__, |
2954 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
2955 | break; |
2956 | } | |
2957 | } | |
c906108c | 2958 | \f |
43ff13b4 | 2959 | |
c906108c SS |
2960 | /* Here to return control to GDB when the inferior stops for real. |
2961 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
2962 | ||
2963 | STOP_PRINT_FRAME nonzero means print the executing frame | |
2964 | (pc, function, args, file, line number and line text). | |
2965 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
2966 | attempting to insert breakpoints. */ | |
2967 | ||
2968 | void | |
96baa820 | 2969 | normal_stop (void) |
c906108c | 2970 | { |
73b65bb0 DJ |
2971 | struct target_waitstatus last; |
2972 | ptid_t last_ptid; | |
2973 | ||
2974 | get_last_target_status (&last_ptid, &last); | |
2975 | ||
c906108c SS |
2976 | /* As with the notification of thread events, we want to delay |
2977 | notifying the user that we've switched thread context until | |
2978 | the inferior actually stops. | |
2979 | ||
73b65bb0 DJ |
2980 | There's no point in saying anything if the inferior has exited. |
2981 | Note that SIGNALLED here means "exited with a signal", not | |
2982 | "received a signal". */ | |
488f131b | 2983 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
2984 | && target_has_execution |
2985 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
2986 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
2987 | { |
2988 | target_terminal_ours_for_output (); | |
c3f6f71d | 2989 | printf_filtered ("[Switching to %s]\n", |
39f77062 KB |
2990 | target_pid_or_tid_to_str (inferior_ptid)); |
2991 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 2992 | } |
c906108c | 2993 | |
4fa8626c | 2994 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
2995 | /* Make sure that the current_frame's pc is correct. This |
2996 | is a correction for setting up the frame info before doing | |
2997 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
2998 | if (target_has_execution) |
2999 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
3000 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
3001 | frame code to check for this and sort out any resultant mess. | |
3002 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 3003 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 3004 | |
c906108c SS |
3005 | if (target_has_execution && breakpoints_inserted) |
3006 | { | |
3007 | if (remove_breakpoints ()) | |
3008 | { | |
3009 | target_terminal_ours_for_output (); | |
3010 | printf_filtered ("Cannot remove breakpoints because "); | |
3011 | printf_filtered ("program is no longer writable.\n"); | |
3012 | printf_filtered ("It might be running in another process.\n"); | |
3013 | printf_filtered ("Further execution is probably impossible.\n"); | |
3014 | } | |
3015 | } | |
3016 | breakpoints_inserted = 0; | |
3017 | ||
3018 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3019 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3020 | ||
3021 | breakpoint_auto_delete (stop_bpstat); | |
3022 | ||
3023 | /* If an auto-display called a function and that got a signal, | |
3024 | delete that auto-display to avoid an infinite recursion. */ | |
3025 | ||
3026 | if (stopped_by_random_signal) | |
3027 | disable_current_display (); | |
3028 | ||
3029 | /* Don't print a message if in the middle of doing a "step n" | |
3030 | operation for n > 1 */ | |
3031 | if (step_multi && stop_step) | |
3032 | goto done; | |
3033 | ||
3034 | target_terminal_ours (); | |
3035 | ||
5913bcb0 AC |
3036 | /* Look up the hook_stop and run it (CLI internally handles problem |
3037 | of stop_command's pre-hook not existing). */ | |
3038 | if (stop_command) | |
3039 | catch_errors (hook_stop_stub, stop_command, | |
3040 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3041 | |
3042 | if (!target_has_stack) | |
3043 | { | |
3044 | ||
3045 | goto done; | |
3046 | } | |
3047 | ||
3048 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3049 | and current location is based on that. | |
3050 | Don't do this on return from a stack dummy routine, | |
3051 | or if the program has exited. */ | |
3052 | ||
3053 | if (!stop_stack_dummy) | |
3054 | { | |
0f7d239c | 3055 | select_frame (get_current_frame ()); |
c906108c SS |
3056 | |
3057 | /* Print current location without a level number, if | |
c5aa993b JM |
3058 | we have changed functions or hit a breakpoint. |
3059 | Print source line if we have one. | |
3060 | bpstat_print() contains the logic deciding in detail | |
3061 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3062 | |
6e7f8b9c | 3063 | if (stop_print_frame && deprecated_selected_frame) |
c906108c SS |
3064 | { |
3065 | int bpstat_ret; | |
3066 | int source_flag; | |
917317f4 | 3067 | int do_frame_printing = 1; |
c906108c SS |
3068 | |
3069 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3070 | switch (bpstat_ret) |
3071 | { | |
3072 | case PRINT_UNKNOWN: | |
aa0cd9c1 | 3073 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
3074 | (or should) carry around the function and does (or |
3075 | should) use that when doing a frame comparison. */ | |
917317f4 | 3076 | if (stop_step |
aa0cd9c1 AC |
3077 | && frame_id_eq (step_frame_id, |
3078 | get_frame_id (get_current_frame ())) | |
917317f4 | 3079 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3080 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3081 | else |
488f131b | 3082 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3083 | break; |
3084 | case PRINT_SRC_AND_LOC: | |
488f131b | 3085 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3086 | break; |
3087 | case PRINT_SRC_ONLY: | |
c5394b80 | 3088 | source_flag = SRC_LINE; |
917317f4 JM |
3089 | break; |
3090 | case PRINT_NOTHING: | |
488f131b | 3091 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3092 | do_frame_printing = 0; |
3093 | break; | |
3094 | default: | |
488f131b | 3095 | internal_error (__FILE__, __LINE__, "Unknown value."); |
917317f4 | 3096 | } |
fb40c209 | 3097 | /* For mi, have the same behavior every time we stop: |
488f131b | 3098 | print everything but the source line. */ |
9dc5e2a9 | 3099 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3100 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3101 | |
9dc5e2a9 | 3102 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3103 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3104 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3105 | /* The behavior of this routine with respect to the source |
3106 | flag is: | |
c5394b80 JM |
3107 | SRC_LINE: Print only source line |
3108 | LOCATION: Print only location | |
3109 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3110 | if (do_frame_printing) |
b04f3ab4 | 3111 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
3112 | |
3113 | /* Display the auto-display expressions. */ | |
3114 | do_displays (); | |
3115 | } | |
3116 | } | |
3117 | ||
3118 | /* Save the function value return registers, if we care. | |
3119 | We might be about to restore their previous contents. */ | |
3120 | if (proceed_to_finish) | |
72cec141 AC |
3121 | /* NB: The copy goes through to the target picking up the value of |
3122 | all the registers. */ | |
3123 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3124 | |
3125 | if (stop_stack_dummy) | |
3126 | { | |
dbe9fe58 AC |
3127 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3128 | ends with a setting of the current frame, so we can use that | |
3129 | next. */ | |
3130 | frame_pop (get_current_frame ()); | |
c906108c | 3131 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3132 | Can't rely on restore_inferior_status because that only gets |
3133 | called if we don't stop in the called function. */ | |
c906108c | 3134 | stop_pc = read_pc (); |
0f7d239c | 3135 | select_frame (get_current_frame ()); |
c906108c SS |
3136 | } |
3137 | ||
c906108c SS |
3138 | done: |
3139 | annotate_stopped (); | |
7a464420 | 3140 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3141 | } |
3142 | ||
3143 | static int | |
96baa820 | 3144 | hook_stop_stub (void *cmd) |
c906108c | 3145 | { |
5913bcb0 | 3146 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3147 | return (0); |
3148 | } | |
3149 | \f | |
c5aa993b | 3150 | int |
96baa820 | 3151 | signal_stop_state (int signo) |
c906108c SS |
3152 | { |
3153 | return signal_stop[signo]; | |
3154 | } | |
3155 | ||
c5aa993b | 3156 | int |
96baa820 | 3157 | signal_print_state (int signo) |
c906108c SS |
3158 | { |
3159 | return signal_print[signo]; | |
3160 | } | |
3161 | ||
c5aa993b | 3162 | int |
96baa820 | 3163 | signal_pass_state (int signo) |
c906108c SS |
3164 | { |
3165 | return signal_program[signo]; | |
3166 | } | |
3167 | ||
488f131b | 3168 | int |
7bda5e4a | 3169 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3170 | { |
3171 | int ret = signal_stop[signo]; | |
3172 | signal_stop[signo] = state; | |
3173 | return ret; | |
3174 | } | |
3175 | ||
488f131b | 3176 | int |
7bda5e4a | 3177 | signal_print_update (int signo, int state) |
d4f3574e SS |
3178 | { |
3179 | int ret = signal_print[signo]; | |
3180 | signal_print[signo] = state; | |
3181 | return ret; | |
3182 | } | |
3183 | ||
488f131b | 3184 | int |
7bda5e4a | 3185 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3186 | { |
3187 | int ret = signal_program[signo]; | |
3188 | signal_program[signo] = state; | |
3189 | return ret; | |
3190 | } | |
3191 | ||
c906108c | 3192 | static void |
96baa820 | 3193 | sig_print_header (void) |
c906108c SS |
3194 | { |
3195 | printf_filtered ("\ | |
3196 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3197 | } | |
3198 | ||
3199 | static void | |
96baa820 | 3200 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3201 | { |
3202 | char *name = target_signal_to_name (oursig); | |
3203 | int name_padding = 13 - strlen (name); | |
96baa820 | 3204 | |
c906108c SS |
3205 | if (name_padding <= 0) |
3206 | name_padding = 0; | |
3207 | ||
3208 | printf_filtered ("%s", name); | |
488f131b | 3209 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3210 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3211 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3212 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3213 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3214 | } | |
3215 | ||
3216 | /* Specify how various signals in the inferior should be handled. */ | |
3217 | ||
3218 | static void | |
96baa820 | 3219 | handle_command (char *args, int from_tty) |
c906108c SS |
3220 | { |
3221 | char **argv; | |
3222 | int digits, wordlen; | |
3223 | int sigfirst, signum, siglast; | |
3224 | enum target_signal oursig; | |
3225 | int allsigs; | |
3226 | int nsigs; | |
3227 | unsigned char *sigs; | |
3228 | struct cleanup *old_chain; | |
3229 | ||
3230 | if (args == NULL) | |
3231 | { | |
3232 | error_no_arg ("signal to handle"); | |
3233 | } | |
3234 | ||
3235 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3236 | ||
3237 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3238 | sigs = (unsigned char *) alloca (nsigs); | |
3239 | memset (sigs, 0, nsigs); | |
3240 | ||
3241 | /* Break the command line up into args. */ | |
3242 | ||
3243 | argv = buildargv (args); | |
3244 | if (argv == NULL) | |
3245 | { | |
3246 | nomem (0); | |
3247 | } | |
7a292a7a | 3248 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3249 | |
3250 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3251 | actions. Signal numbers and signal names may be interspersed with | |
3252 | actions, with the actions being performed for all signals cumulatively | |
3253 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3254 | ||
3255 | while (*argv != NULL) | |
3256 | { | |
3257 | wordlen = strlen (*argv); | |
3258 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3259 | {; | |
3260 | } | |
3261 | allsigs = 0; | |
3262 | sigfirst = siglast = -1; | |
3263 | ||
3264 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3265 | { | |
3266 | /* Apply action to all signals except those used by the | |
3267 | debugger. Silently skip those. */ | |
3268 | allsigs = 1; | |
3269 | sigfirst = 0; | |
3270 | siglast = nsigs - 1; | |
3271 | } | |
3272 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3273 | { | |
3274 | SET_SIGS (nsigs, sigs, signal_stop); | |
3275 | SET_SIGS (nsigs, sigs, signal_print); | |
3276 | } | |
3277 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3278 | { | |
3279 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3280 | } | |
3281 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3282 | { | |
3283 | SET_SIGS (nsigs, sigs, signal_print); | |
3284 | } | |
3285 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3286 | { | |
3287 | SET_SIGS (nsigs, sigs, signal_program); | |
3288 | } | |
3289 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3290 | { | |
3291 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3292 | } | |
3293 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3294 | { | |
3295 | SET_SIGS (nsigs, sigs, signal_program); | |
3296 | } | |
3297 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3298 | { | |
3299 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3300 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3301 | } | |
3302 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3303 | { | |
3304 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3305 | } | |
3306 | else if (digits > 0) | |
3307 | { | |
3308 | /* It is numeric. The numeric signal refers to our own | |
3309 | internal signal numbering from target.h, not to host/target | |
3310 | signal number. This is a feature; users really should be | |
3311 | using symbolic names anyway, and the common ones like | |
3312 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3313 | ||
3314 | sigfirst = siglast = (int) | |
3315 | target_signal_from_command (atoi (*argv)); | |
3316 | if ((*argv)[digits] == '-') | |
3317 | { | |
3318 | siglast = (int) | |
3319 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3320 | } | |
3321 | if (sigfirst > siglast) | |
3322 | { | |
3323 | /* Bet he didn't figure we'd think of this case... */ | |
3324 | signum = sigfirst; | |
3325 | sigfirst = siglast; | |
3326 | siglast = signum; | |
3327 | } | |
3328 | } | |
3329 | else | |
3330 | { | |
3331 | oursig = target_signal_from_name (*argv); | |
3332 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3333 | { | |
3334 | sigfirst = siglast = (int) oursig; | |
3335 | } | |
3336 | else | |
3337 | { | |
3338 | /* Not a number and not a recognized flag word => complain. */ | |
3339 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3340 | } | |
3341 | } | |
3342 | ||
3343 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3344 | which signals to apply actions to. */ |
c906108c SS |
3345 | |
3346 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3347 | { | |
3348 | switch ((enum target_signal) signum) | |
3349 | { | |
3350 | case TARGET_SIGNAL_TRAP: | |
3351 | case TARGET_SIGNAL_INT: | |
3352 | if (!allsigs && !sigs[signum]) | |
3353 | { | |
3354 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3355 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3356 | { |
3357 | sigs[signum] = 1; | |
3358 | } | |
3359 | else | |
3360 | { | |
3361 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3362 | gdb_flush (gdb_stdout); | |
3363 | } | |
3364 | } | |
3365 | break; | |
3366 | case TARGET_SIGNAL_0: | |
3367 | case TARGET_SIGNAL_DEFAULT: | |
3368 | case TARGET_SIGNAL_UNKNOWN: | |
3369 | /* Make sure that "all" doesn't print these. */ | |
3370 | break; | |
3371 | default: | |
3372 | sigs[signum] = 1; | |
3373 | break; | |
3374 | } | |
3375 | } | |
3376 | ||
3377 | argv++; | |
3378 | } | |
3379 | ||
39f77062 | 3380 | target_notice_signals (inferior_ptid); |
c906108c SS |
3381 | |
3382 | if (from_tty) | |
3383 | { | |
3384 | /* Show the results. */ | |
3385 | sig_print_header (); | |
3386 | for (signum = 0; signum < nsigs; signum++) | |
3387 | { | |
3388 | if (sigs[signum]) | |
3389 | { | |
3390 | sig_print_info (signum); | |
3391 | } | |
3392 | } | |
3393 | } | |
3394 | ||
3395 | do_cleanups (old_chain); | |
3396 | } | |
3397 | ||
3398 | static void | |
96baa820 | 3399 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3400 | { |
3401 | char **argv; | |
3402 | struct cleanup *old_chain; | |
3403 | ||
3404 | /* Break the command line up into args. */ | |
3405 | ||
3406 | argv = buildargv (args); | |
3407 | if (argv == NULL) | |
3408 | { | |
3409 | nomem (0); | |
3410 | } | |
7a292a7a | 3411 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3412 | if (argv[1] != (char *) NULL) |
3413 | { | |
3414 | char *argBuf; | |
3415 | int bufLen; | |
3416 | ||
3417 | bufLen = strlen (argv[0]) + 20; | |
3418 | argBuf = (char *) xmalloc (bufLen); | |
3419 | if (argBuf) | |
3420 | { | |
3421 | int validFlag = 1; | |
3422 | enum target_signal oursig; | |
3423 | ||
3424 | oursig = target_signal_from_name (argv[0]); | |
3425 | memset (argBuf, 0, bufLen); | |
3426 | if (strcmp (argv[1], "Q") == 0) | |
3427 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3428 | else | |
3429 | { | |
3430 | if (strcmp (argv[1], "s") == 0) | |
3431 | { | |
3432 | if (!signal_stop[oursig]) | |
3433 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3434 | else | |
3435 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3436 | } | |
3437 | else if (strcmp (argv[1], "i") == 0) | |
3438 | { | |
3439 | if (!signal_program[oursig]) | |
3440 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3441 | else | |
3442 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3443 | } | |
3444 | else if (strcmp (argv[1], "r") == 0) | |
3445 | { | |
3446 | if (!signal_print[oursig]) | |
3447 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3448 | else | |
3449 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3450 | } | |
3451 | else | |
3452 | validFlag = 0; | |
3453 | } | |
3454 | if (validFlag) | |
3455 | handle_command (argBuf, from_tty); | |
3456 | else | |
3457 | printf_filtered ("Invalid signal handling flag.\n"); | |
3458 | if (argBuf) | |
b8c9b27d | 3459 | xfree (argBuf); |
c906108c SS |
3460 | } |
3461 | } | |
3462 | do_cleanups (old_chain); | |
3463 | } | |
3464 | ||
3465 | /* Print current contents of the tables set by the handle command. | |
3466 | It is possible we should just be printing signals actually used | |
3467 | by the current target (but for things to work right when switching | |
3468 | targets, all signals should be in the signal tables). */ | |
3469 | ||
3470 | static void | |
96baa820 | 3471 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3472 | { |
3473 | enum target_signal oursig; | |
3474 | sig_print_header (); | |
3475 | ||
3476 | if (signum_exp) | |
3477 | { | |
3478 | /* First see if this is a symbol name. */ | |
3479 | oursig = target_signal_from_name (signum_exp); | |
3480 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3481 | { | |
3482 | /* No, try numeric. */ | |
3483 | oursig = | |
bb518678 | 3484 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3485 | } |
3486 | sig_print_info (oursig); | |
3487 | return; | |
3488 | } | |
3489 | ||
3490 | printf_filtered ("\n"); | |
3491 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3492 | for (oursig = TARGET_SIGNAL_FIRST; | |
3493 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3494 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3495 | { | |
3496 | QUIT; | |
3497 | ||
3498 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3499 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3500 | sig_print_info (oursig); |
3501 | } | |
3502 | ||
3503 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3504 | } | |
3505 | \f | |
7a292a7a SS |
3506 | struct inferior_status |
3507 | { | |
3508 | enum target_signal stop_signal; | |
3509 | CORE_ADDR stop_pc; | |
3510 | bpstat stop_bpstat; | |
3511 | int stop_step; | |
3512 | int stop_stack_dummy; | |
3513 | int stopped_by_random_signal; | |
3514 | int trap_expected; | |
3515 | CORE_ADDR step_range_start; | |
3516 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3517 | struct frame_id step_frame_id; |
5fbbeb29 | 3518 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3519 | CORE_ADDR step_resume_break_address; |
3520 | int stop_after_trap; | |
c0236d92 | 3521 | int stop_soon; |
72cec141 | 3522 | struct regcache *stop_registers; |
7a292a7a SS |
3523 | |
3524 | /* These are here because if call_function_by_hand has written some | |
3525 | registers and then decides to call error(), we better not have changed | |
3526 | any registers. */ | |
72cec141 | 3527 | struct regcache *registers; |
7a292a7a | 3528 | |
101dcfbe AC |
3529 | /* A frame unique identifier. */ |
3530 | struct frame_id selected_frame_id; | |
3531 | ||
7a292a7a SS |
3532 | int breakpoint_proceeded; |
3533 | int restore_stack_info; | |
3534 | int proceed_to_finish; | |
3535 | }; | |
3536 | ||
7a292a7a | 3537 | void |
96baa820 JM |
3538 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3539 | LONGEST val) | |
7a292a7a | 3540 | { |
3acba339 | 3541 | int size = register_size (current_gdbarch, regno); |
7a292a7a SS |
3542 | void *buf = alloca (size); |
3543 | store_signed_integer (buf, size, val); | |
0818c12a | 3544 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3545 | } |
3546 | ||
c906108c SS |
3547 | /* Save all of the information associated with the inferior<==>gdb |
3548 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3549 | (defined in inferior.h). */ | |
3550 | ||
7a292a7a | 3551 | struct inferior_status * |
96baa820 | 3552 | save_inferior_status (int restore_stack_info) |
c906108c | 3553 | { |
72cec141 | 3554 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3555 | |
c906108c SS |
3556 | inf_status->stop_signal = stop_signal; |
3557 | inf_status->stop_pc = stop_pc; | |
3558 | inf_status->stop_step = stop_step; | |
3559 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3560 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3561 | inf_status->trap_expected = trap_expected; | |
3562 | inf_status->step_range_start = step_range_start; | |
3563 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3564 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3565 | inf_status->step_over_calls = step_over_calls; |
3566 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3567 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3568 | /* Save original bpstat chain here; replace it with copy of chain. |
3569 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3570 | hand them back the original chain when restore_inferior_status is |
3571 | called. */ | |
c906108c SS |
3572 | inf_status->stop_bpstat = stop_bpstat; |
3573 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3574 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3575 | inf_status->restore_stack_info = restore_stack_info; | |
3576 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3577 | |
72cec141 | 3578 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3579 | |
72cec141 | 3580 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3581 | |
7a424e99 | 3582 | inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
7a292a7a | 3583 | return inf_status; |
c906108c SS |
3584 | } |
3585 | ||
c906108c | 3586 | static int |
96baa820 | 3587 | restore_selected_frame (void *args) |
c906108c | 3588 | { |
488f131b | 3589 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3590 | struct frame_info *frame; |
c906108c | 3591 | |
101dcfbe | 3592 | frame = frame_find_by_id (*fid); |
c906108c | 3593 | |
aa0cd9c1 AC |
3594 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3595 | selected frame. */ | |
101dcfbe | 3596 | if (frame == NULL) |
c906108c SS |
3597 | { |
3598 | warning ("Unable to restore previously selected frame.\n"); | |
3599 | return 0; | |
3600 | } | |
3601 | ||
0f7d239c | 3602 | select_frame (frame); |
c906108c SS |
3603 | |
3604 | return (1); | |
3605 | } | |
3606 | ||
3607 | void | |
96baa820 | 3608 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3609 | { |
3610 | stop_signal = inf_status->stop_signal; | |
3611 | stop_pc = inf_status->stop_pc; | |
3612 | stop_step = inf_status->stop_step; | |
3613 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3614 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3615 | trap_expected = inf_status->trap_expected; | |
3616 | step_range_start = inf_status->step_range_start; | |
3617 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3618 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3619 | step_over_calls = inf_status->step_over_calls; |
3620 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3621 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3622 | bpstat_clear (&stop_bpstat); |
3623 | stop_bpstat = inf_status->stop_bpstat; | |
3624 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3625 | proceed_to_finish = inf_status->proceed_to_finish; | |
3626 | ||
72cec141 AC |
3627 | /* FIXME: Is the restore of stop_registers always needed. */ |
3628 | regcache_xfree (stop_registers); | |
3629 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3630 | |
3631 | /* The inferior can be gone if the user types "print exit(0)" | |
3632 | (and perhaps other times). */ | |
3633 | if (target_has_execution) | |
72cec141 AC |
3634 | /* NB: The register write goes through to the target. */ |
3635 | regcache_cpy (current_regcache, inf_status->registers); | |
3636 | regcache_xfree (inf_status->registers); | |
c906108c | 3637 | |
c906108c SS |
3638 | /* FIXME: If we are being called after stopping in a function which |
3639 | is called from gdb, we should not be trying to restore the | |
3640 | selected frame; it just prints a spurious error message (The | |
3641 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3642 | clobbers the stack)). In fact, should we be restoring the | |
3643 | inferior status at all in that case? . */ | |
3644 | ||
3645 | if (target_has_stack && inf_status->restore_stack_info) | |
3646 | { | |
c906108c | 3647 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3648 | walking the stack might encounter a garbage pointer and |
3649 | error() trying to dereference it. */ | |
488f131b JB |
3650 | if (catch_errors |
3651 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3652 | "Unable to restore previously selected frame:\n", | |
3653 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3654 | /* Error in restoring the selected frame. Select the innermost |
3655 | frame. */ | |
0f7d239c | 3656 | select_frame (get_current_frame ()); |
c906108c SS |
3657 | |
3658 | } | |
c906108c | 3659 | |
72cec141 | 3660 | xfree (inf_status); |
7a292a7a | 3661 | } |
c906108c | 3662 | |
74b7792f AC |
3663 | static void |
3664 | do_restore_inferior_status_cleanup (void *sts) | |
3665 | { | |
3666 | restore_inferior_status (sts); | |
3667 | } | |
3668 | ||
3669 | struct cleanup * | |
3670 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3671 | { | |
3672 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3673 | } | |
3674 | ||
c906108c | 3675 | void |
96baa820 | 3676 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3677 | { |
3678 | /* See save_inferior_status for info on stop_bpstat. */ | |
3679 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3680 | regcache_xfree (inf_status->registers); |
3681 | regcache_xfree (inf_status->stop_registers); | |
3682 | xfree (inf_status); | |
7a292a7a SS |
3683 | } |
3684 | ||
47932f85 DJ |
3685 | int |
3686 | inferior_has_forked (int pid, int *child_pid) | |
3687 | { | |
3688 | struct target_waitstatus last; | |
3689 | ptid_t last_ptid; | |
3690 | ||
3691 | get_last_target_status (&last_ptid, &last); | |
3692 | ||
3693 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3694 | return 0; | |
3695 | ||
3696 | if (ptid_get_pid (last_ptid) != pid) | |
3697 | return 0; | |
3698 | ||
3699 | *child_pid = last.value.related_pid; | |
3700 | return 1; | |
3701 | } | |
3702 | ||
3703 | int | |
3704 | inferior_has_vforked (int pid, int *child_pid) | |
3705 | { | |
3706 | struct target_waitstatus last; | |
3707 | ptid_t last_ptid; | |
3708 | ||
3709 | get_last_target_status (&last_ptid, &last); | |
3710 | ||
3711 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3712 | return 0; | |
3713 | ||
3714 | if (ptid_get_pid (last_ptid) != pid) | |
3715 | return 0; | |
3716 | ||
3717 | *child_pid = last.value.related_pid; | |
3718 | return 1; | |
3719 | } | |
3720 | ||
3721 | int | |
3722 | inferior_has_execd (int pid, char **execd_pathname) | |
3723 | { | |
3724 | struct target_waitstatus last; | |
3725 | ptid_t last_ptid; | |
3726 | ||
3727 | get_last_target_status (&last_ptid, &last); | |
3728 | ||
3729 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3730 | return 0; | |
3731 | ||
3732 | if (ptid_get_pid (last_ptid) != pid) | |
3733 | return 0; | |
3734 | ||
3735 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3736 | return 1; | |
3737 | } | |
3738 | ||
ca6724c1 KB |
3739 | /* Oft used ptids */ |
3740 | ptid_t null_ptid; | |
3741 | ptid_t minus_one_ptid; | |
3742 | ||
3743 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3744 | |
ca6724c1 KB |
3745 | ptid_t |
3746 | ptid_build (int pid, long lwp, long tid) | |
3747 | { | |
3748 | ptid_t ptid; | |
3749 | ||
3750 | ptid.pid = pid; | |
3751 | ptid.lwp = lwp; | |
3752 | ptid.tid = tid; | |
3753 | return ptid; | |
3754 | } | |
3755 | ||
3756 | /* Create a ptid from just a pid. */ | |
3757 | ||
3758 | ptid_t | |
3759 | pid_to_ptid (int pid) | |
3760 | { | |
3761 | return ptid_build (pid, 0, 0); | |
3762 | } | |
3763 | ||
3764 | /* Fetch the pid (process id) component from a ptid. */ | |
3765 | ||
3766 | int | |
3767 | ptid_get_pid (ptid_t ptid) | |
3768 | { | |
3769 | return ptid.pid; | |
3770 | } | |
3771 | ||
3772 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3773 | ||
3774 | long | |
3775 | ptid_get_lwp (ptid_t ptid) | |
3776 | { | |
3777 | return ptid.lwp; | |
3778 | } | |
3779 | ||
3780 | /* Fetch the tid (thread id) component from a ptid. */ | |
3781 | ||
3782 | long | |
3783 | ptid_get_tid (ptid_t ptid) | |
3784 | { | |
3785 | return ptid.tid; | |
3786 | } | |
3787 | ||
3788 | /* ptid_equal() is used to test equality of two ptids. */ | |
3789 | ||
3790 | int | |
3791 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3792 | { | |
3793 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3794 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3795 | } |
3796 | ||
3797 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3798 | to restore the inferior_ptid value saved in a call to | |
3799 | save_inferior_ptid(). */ | |
ce696e05 KB |
3800 | |
3801 | static void | |
3802 | restore_inferior_ptid (void *arg) | |
3803 | { | |
3804 | ptid_t *saved_ptid_ptr = arg; | |
3805 | inferior_ptid = *saved_ptid_ptr; | |
3806 | xfree (arg); | |
3807 | } | |
3808 | ||
3809 | /* Save the value of inferior_ptid so that it may be restored by a | |
3810 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3811 | needed for later doing the cleanup. */ | |
3812 | ||
3813 | struct cleanup * | |
3814 | save_inferior_ptid (void) | |
3815 | { | |
3816 | ptid_t *saved_ptid_ptr; | |
3817 | ||
3818 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3819 | *saved_ptid_ptr = inferior_ptid; | |
3820 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3821 | } | |
c5aa993b | 3822 | \f |
488f131b | 3823 | |
7a292a7a | 3824 | static void |
96baa820 | 3825 | build_infrun (void) |
7a292a7a | 3826 | { |
72cec141 | 3827 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3828 | } |
c906108c | 3829 | |
c906108c | 3830 | void |
96baa820 | 3831 | _initialize_infrun (void) |
c906108c | 3832 | { |
52f0bd74 AC |
3833 | int i; |
3834 | int numsigs; | |
c906108c SS |
3835 | struct cmd_list_element *c; |
3836 | ||
046a4708 AC |
3837 | DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers); |
3838 | deprecated_register_gdbarch_swap (NULL, 0, build_infrun); | |
0f71a2f6 | 3839 | |
c906108c SS |
3840 | add_info ("signals", signals_info, |
3841 | "What debugger does when program gets various signals.\n\ | |
3842 | Specify a signal as argument to print info on that signal only."); | |
3843 | add_info_alias ("handle", "signals", 0); | |
3844 | ||
3845 | add_com ("handle", class_run, handle_command, | |
3846 | concat ("Specify how to handle a signal.\n\ | |
3847 | Args are signals and actions to apply to those signals.\n\ | |
3848 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3849 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3850 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3851 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3852 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
3853 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3854 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3855 | Print means print a message if this signal happens.\n\ | |
3856 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3857 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3858 | Pass and Stop may be combined.", NULL)); | |
3859 | if (xdb_commands) | |
3860 | { | |
3861 | add_com ("lz", class_info, signals_info, | |
3862 | "What debugger does when program gets various signals.\n\ | |
3863 | Specify a signal as argument to print info on that signal only."); | |
3864 | add_com ("z", class_run, xdb_handle_command, | |
3865 | concat ("Specify how to handle a signal.\n\ | |
3866 | Args are signals and actions to apply to those signals.\n\ | |
3867 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3868 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3869 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3870 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3871 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
c906108c SS |
3872 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3873 | nopass), \"Q\" (noprint)\n\ | |
3874 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3875 | Print means print a message if this signal happens.\n\ | |
3876 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3877 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3878 | Pass and Stop may be combined.", NULL)); | |
3879 | } | |
3880 | ||
3881 | if (!dbx_commands) | |
488f131b JB |
3882 | stop_command = |
3883 | add_cmd ("stop", class_obscure, not_just_help_class_command, "There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c SS |
3884 | This allows you to set a list of commands to be run each time execution\n\ |
3885 | of the program stops.", &cmdlist); | |
3886 | ||
527159b7 RC |
3887 | add_set_cmd ("infrun", class_maintenance, var_zinteger, |
3888 | &debug_infrun, "Set inferior debugging.\n\ | |
3889 | When non-zero, inferior specific debugging is enabled.", &setdebuglist); | |
3890 | ||
c906108c | 3891 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 3892 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
3893 | signal_print = (unsigned char *) |
3894 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3895 | signal_program = (unsigned char *) | |
3896 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3897 | for (i = 0; i < numsigs; i++) | |
3898 | { | |
3899 | signal_stop[i] = 1; | |
3900 | signal_print[i] = 1; | |
3901 | signal_program[i] = 1; | |
3902 | } | |
3903 | ||
3904 | /* Signals caused by debugger's own actions | |
3905 | should not be given to the program afterwards. */ | |
3906 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
3907 | signal_program[TARGET_SIGNAL_INT] = 0; | |
3908 | ||
3909 | /* Signals that are not errors should not normally enter the debugger. */ | |
3910 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
3911 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
3912 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
3913 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
3914 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
3915 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
3916 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
3917 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
3918 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
3919 | signal_print[TARGET_SIGNAL_IO] = 0; | |
3920 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
3921 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
3922 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
3923 | signal_print[TARGET_SIGNAL_URG] = 0; | |
3924 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
3925 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
3926 | ||
cd0fc7c3 SS |
3927 | /* These signals are used internally by user-level thread |
3928 | implementations. (See signal(5) on Solaris.) Like the above | |
3929 | signals, a healthy program receives and handles them as part of | |
3930 | its normal operation. */ | |
3931 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
3932 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
3933 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
3934 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
3935 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
3936 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
3937 | ||
c906108c | 3938 | #ifdef SOLIB_ADD |
cb1a6d5f | 3939 | deprecated_add_show_from_set |
c906108c SS |
3940 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, |
3941 | (char *) &stop_on_solib_events, | |
3942 | "Set stopping for shared library events.\n\ | |
3943 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
3944 | notifies gdb of shared library events. The most common event of interest\n\ | |
488f131b | 3945 | to the user would be loading/unloading of a new library.\n", &setlist), &showlist); |
c906108c SS |
3946 | #endif |
3947 | ||
3948 | c = add_set_enum_cmd ("follow-fork-mode", | |
3949 | class_run, | |
488f131b | 3950 | follow_fork_mode_kind_names, &follow_fork_mode_string, |
c906108c SS |
3951 | "Set debugger response to a program call of fork \ |
3952 | or vfork.\n\ | |
3953 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
3954 | parent - the original process is debugged after a fork\n\ | |
3955 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 3956 | The unfollowed process will continue to run.\n\ |
488f131b | 3957 | By default, the debugger will follow the parent process.", &setlist); |
cb1a6d5f | 3958 | deprecated_add_show_from_set (c, &showlist); |
c906108c | 3959 | |
488f131b | 3960 | c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */ |
1ed2a135 | 3961 | &scheduler_mode, /* current mode */ |
c906108c SS |
3962 | "Set mode for locking scheduler during execution.\n\ |
3963 | off == no locking (threads may preempt at any time)\n\ | |
3964 | on == full locking (no thread except the current thread may run)\n\ | |
3965 | step == scheduler locked during every single-step operation.\n\ | |
3966 | In this mode, no other thread may run during a step command.\n\ | |
488f131b | 3967 | Other threads may run while stepping over a function call ('next').", &setlist); |
c906108c | 3968 | |
9f60d481 | 3969 | set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */ |
cb1a6d5f | 3970 | deprecated_add_show_from_set (c, &showlist); |
5fbbeb29 CF |
3971 | |
3972 | c = add_set_cmd ("step-mode", class_run, | |
488f131b JB |
3973 | var_boolean, (char *) &step_stop_if_no_debug, |
3974 | "Set mode of the step operation. When set, doing a step over a\n\ | |
5fbbeb29 CF |
3975 | function without debug line information will stop at the first\n\ |
3976 | instruction of that function. Otherwise, the function is skipped and\n\ | |
488f131b | 3977 | the step command stops at a different source line.", &setlist); |
cb1a6d5f | 3978 | deprecated_add_show_from_set (c, &showlist); |
ca6724c1 KB |
3979 | |
3980 | /* ptid initializations */ | |
3981 | null_ptid = ptid_build (0, 0, 0); | |
3982 | minus_one_ptid = ptid_build (-1, 0, 0); | |
3983 | inferior_ptid = null_ptid; | |
3984 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 3985 | } |