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, | |
873 | infwait_nullified_state, | |
874 | infwait_nonstep_watch_state | |
b83266a0 SS |
875 | }; |
876 | ||
11cf8741 JM |
877 | /* Why did the inferior stop? Used to print the appropriate messages |
878 | to the interface from within handle_inferior_event(). */ | |
879 | enum inferior_stop_reason | |
880 | { | |
881 | /* We don't know why. */ | |
882 | STOP_UNKNOWN, | |
883 | /* Step, next, nexti, stepi finished. */ | |
884 | END_STEPPING_RANGE, | |
885 | /* Found breakpoint. */ | |
886 | BREAKPOINT_HIT, | |
887 | /* Inferior terminated by signal. */ | |
888 | SIGNAL_EXITED, | |
889 | /* Inferior exited. */ | |
890 | EXITED, | |
891 | /* Inferior received signal, and user asked to be notified. */ | |
892 | SIGNAL_RECEIVED | |
893 | }; | |
894 | ||
cd0fc7c3 SS |
895 | /* This structure contains what used to be local variables in |
896 | wait_for_inferior. Probably many of them can return to being | |
897 | locals in handle_inferior_event. */ | |
898 | ||
c5aa993b | 899 | struct execution_control_state |
488f131b JB |
900 | { |
901 | struct target_waitstatus ws; | |
902 | struct target_waitstatus *wp; | |
903 | int another_trap; | |
904 | int random_signal; | |
905 | CORE_ADDR stop_func_start; | |
906 | CORE_ADDR stop_func_end; | |
907 | char *stop_func_name; | |
908 | struct symtab_and_line sal; | |
488f131b JB |
909 | int current_line; |
910 | struct symtab *current_symtab; | |
911 | int handling_longjmp; /* FIXME */ | |
912 | ptid_t ptid; | |
913 | ptid_t saved_inferior_ptid; | |
68f53502 | 914 | int step_after_step_resume_breakpoint; |
488f131b JB |
915 | int stepping_through_solib_after_catch; |
916 | bpstat stepping_through_solib_catchpoints; | |
917 | int enable_hw_watchpoints_after_wait; | |
488f131b JB |
918 | int new_thread_event; |
919 | struct target_waitstatus tmpstatus; | |
920 | enum infwait_states infwait_state; | |
921 | ptid_t waiton_ptid; | |
922 | int wait_some_more; | |
923 | }; | |
924 | ||
925 | void init_execution_control_state (struct execution_control_state *ecs); | |
926 | ||
927 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 928 | |
c2c6d25f | 929 | static void step_into_function (struct execution_control_state *ecs); |
44cbf7b5 AC |
930 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
931 | static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
932 | struct frame_id sr_id); | |
104c1213 JM |
933 | static void stop_stepping (struct execution_control_state *ecs); |
934 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 935 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
936 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
937 | int stop_info); | |
104c1213 | 938 | |
cd0fc7c3 SS |
939 | /* Wait for control to return from inferior to debugger. |
940 | If inferior gets a signal, we may decide to start it up again | |
941 | instead of returning. That is why there is a loop in this function. | |
942 | When this function actually returns it means the inferior | |
943 | should be left stopped and GDB should read more commands. */ | |
944 | ||
945 | void | |
96baa820 | 946 | wait_for_inferior (void) |
cd0fc7c3 SS |
947 | { |
948 | struct cleanup *old_cleanups; | |
949 | struct execution_control_state ecss; | |
950 | struct execution_control_state *ecs; | |
c906108c | 951 | |
527159b7 RC |
952 | if (debug_infrun) |
953 | printf_unfiltered ("infrun: wait_for_inferior\n"); | |
954 | ||
8601f500 | 955 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 956 | &step_resume_breakpoint); |
cd0fc7c3 SS |
957 | |
958 | /* wfi still stays in a loop, so it's OK just to take the address of | |
959 | a local to get the ecs pointer. */ | |
960 | ecs = &ecss; | |
961 | ||
962 | /* Fill in with reasonable starting values. */ | |
963 | init_execution_control_state (ecs); | |
964 | ||
c906108c | 965 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 966 | previous_inferior_ptid = inferior_ptid; |
c906108c | 967 | |
cd0fc7c3 SS |
968 | overlay_cache_invalid = 1; |
969 | ||
970 | /* We have to invalidate the registers BEFORE calling target_wait | |
971 | because they can be loaded from the target while in target_wait. | |
972 | This makes remote debugging a bit more efficient for those | |
973 | targets that provide critical registers as part of their normal | |
974 | status mechanism. */ | |
975 | ||
976 | registers_changed (); | |
b83266a0 | 977 | |
c906108c SS |
978 | while (1) |
979 | { | |
9a4105ab AC |
980 | if (deprecated_target_wait_hook) |
981 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); | |
cd0fc7c3 | 982 | else |
39f77062 | 983 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 984 | |
cd0fc7c3 SS |
985 | /* Now figure out what to do with the result of the result. */ |
986 | handle_inferior_event (ecs); | |
c906108c | 987 | |
cd0fc7c3 SS |
988 | if (!ecs->wait_some_more) |
989 | break; | |
990 | } | |
991 | do_cleanups (old_cleanups); | |
992 | } | |
c906108c | 993 | |
43ff13b4 JM |
994 | /* Asynchronous version of wait_for_inferior. It is called by the |
995 | event loop whenever a change of state is detected on the file | |
996 | descriptor corresponding to the target. It can be called more than | |
997 | once to complete a single execution command. In such cases we need | |
998 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
999 | last time that this function is called for a single execution | |
1000 | command, then report to the user that the inferior has stopped, and | |
1001 | do the necessary cleanups. */ | |
1002 | ||
1003 | struct execution_control_state async_ecss; | |
1004 | struct execution_control_state *async_ecs; | |
1005 | ||
1006 | void | |
fba45db2 | 1007 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1008 | { |
1009 | static struct cleanup *old_cleanups; | |
1010 | ||
c5aa993b | 1011 | async_ecs = &async_ecss; |
43ff13b4 JM |
1012 | |
1013 | if (!async_ecs->wait_some_more) | |
1014 | { | |
488f131b | 1015 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1016 | &step_resume_breakpoint); |
43ff13b4 JM |
1017 | |
1018 | /* Fill in with reasonable starting values. */ | |
1019 | init_execution_control_state (async_ecs); | |
1020 | ||
43ff13b4 | 1021 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1022 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1023 | |
1024 | overlay_cache_invalid = 1; | |
1025 | ||
1026 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1027 | because they can be loaded from the target while in target_wait. |
1028 | This makes remote debugging a bit more efficient for those | |
1029 | targets that provide critical registers as part of their normal | |
1030 | status mechanism. */ | |
43ff13b4 JM |
1031 | |
1032 | registers_changed (); | |
1033 | } | |
1034 | ||
9a4105ab | 1035 | if (deprecated_target_wait_hook) |
488f131b | 1036 | async_ecs->ptid = |
9a4105ab | 1037 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1038 | else |
39f77062 | 1039 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1040 | |
1041 | /* Now figure out what to do with the result of the result. */ | |
1042 | handle_inferior_event (async_ecs); | |
1043 | ||
1044 | if (!async_ecs->wait_some_more) | |
1045 | { | |
adf40b2e | 1046 | /* Do only the cleanups that have been added by this |
488f131b JB |
1047 | function. Let the continuations for the commands do the rest, |
1048 | if there are any. */ | |
43ff13b4 JM |
1049 | do_exec_cleanups (old_cleanups); |
1050 | normal_stop (); | |
c2d11a7d JM |
1051 | if (step_multi && stop_step) |
1052 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1053 | else | |
1054 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1055 | } |
1056 | } | |
1057 | ||
cd0fc7c3 SS |
1058 | /* Prepare an execution control state for looping through a |
1059 | wait_for_inferior-type loop. */ | |
1060 | ||
1061 | void | |
96baa820 | 1062 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1063 | { |
c2d11a7d | 1064 | /* ecs->another_trap? */ |
cd0fc7c3 | 1065 | ecs->random_signal = 0; |
68f53502 | 1066 | ecs->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 | 1067 | ecs->handling_longjmp = 0; /* FIXME */ |
cd0fc7c3 SS |
1068 | ecs->stepping_through_solib_after_catch = 0; |
1069 | ecs->stepping_through_solib_catchpoints = NULL; | |
1070 | ecs->enable_hw_watchpoints_after_wait = 0; | |
cd0fc7c3 SS |
1071 | ecs->sal = find_pc_line (prev_pc, 0); |
1072 | ecs->current_line = ecs->sal.line; | |
1073 | ecs->current_symtab = ecs->sal.symtab; | |
1074 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1075 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1076 | ecs->wp = &(ecs->ws); |
1077 | } | |
1078 | ||
e02bc4cc | 1079 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1080 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1081 | cached by handle_inferior_event(), which gets called immediately | |
1082 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1083 | |
1084 | void | |
488f131b | 1085 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1086 | { |
39f77062 | 1087 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1088 | *status = target_last_waitstatus; |
1089 | } | |
1090 | ||
dd80620e MS |
1091 | /* Switch thread contexts, maintaining "infrun state". */ |
1092 | ||
1093 | static void | |
1094 | context_switch (struct execution_control_state *ecs) | |
1095 | { | |
1096 | /* Caution: it may happen that the new thread (or the old one!) | |
1097 | is not in the thread list. In this case we must not attempt | |
1098 | to "switch context", or we run the risk that our context may | |
1099 | be lost. This may happen as a result of the target module | |
1100 | mishandling thread creation. */ | |
1101 | ||
1102 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) | |
488f131b | 1103 | { /* Perform infrun state context switch: */ |
dd80620e | 1104 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1105 | save_infrun_state (inferior_ptid, prev_pc, |
dd80620e | 1106 | trap_expected, step_resume_breakpoint, |
15960608 | 1107 | step_range_start, |
aa0cd9c1 | 1108 | step_range_end, &step_frame_id, |
dd80620e MS |
1109 | ecs->handling_longjmp, ecs->another_trap, |
1110 | ecs->stepping_through_solib_after_catch, | |
1111 | ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1112 | ecs->current_line, ecs->current_symtab); |
dd80620e MS |
1113 | |
1114 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1115 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1116 | &trap_expected, &step_resume_breakpoint, |
15960608 | 1117 | &step_range_start, |
aa0cd9c1 | 1118 | &step_range_end, &step_frame_id, |
dd80620e MS |
1119 | &ecs->handling_longjmp, &ecs->another_trap, |
1120 | &ecs->stepping_through_solib_after_catch, | |
1121 | &ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1122 | &ecs->current_line, &ecs->current_symtab); |
dd80620e MS |
1123 | } |
1124 | inferior_ptid = ecs->ptid; | |
1125 | } | |
1126 | ||
4fa8626c DJ |
1127 | static void |
1128 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1129 | { | |
8aad930b | 1130 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1131 | |
1132 | /* If this target does not decrement the PC after breakpoints, then | |
1133 | we have nothing to do. */ | |
1134 | if (DECR_PC_AFTER_BREAK == 0) | |
1135 | return; | |
1136 | ||
1137 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1138 | we aren't, just return. | |
9709f61c DJ |
1139 | |
1140 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
1141 | affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented | |
1142 | by software breakpoints should be handled through the normal breakpoint | |
1143 | layer. | |
8fb3e588 | 1144 | |
4fa8626c DJ |
1145 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
1146 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1147 | clear where the PC is pointing afterwards. It may not match | |
1148 | DECR_PC_AFTER_BREAK. I don't know any specific target that generates | |
1149 | these signals at breakpoints (the code has been in GDB since at least | |
1150 | 1992) so I can not guess how to handle them here. | |
8fb3e588 | 1151 | |
4fa8626c DJ |
1152 | In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS |
1153 | would have the PC after hitting a watchpoint affected by | |
1154 | DECR_PC_AFTER_BREAK. I haven't found any target with both of these set | |
1155 | in GDB history, and it seems unlikely to be correct, so | |
1156 | HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */ | |
1157 | ||
1158 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1159 | return; | |
1160 | ||
1161 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1162 | return; | |
1163 | ||
8aad930b AC |
1164 | /* Find the location where (if we've hit a breakpoint) the |
1165 | breakpoint would be. */ | |
1166 | breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK; | |
1167 | ||
1168 | if (SOFTWARE_SINGLE_STEP_P ()) | |
1169 | { | |
1170 | /* When using software single-step, a SIGTRAP can only indicate | |
8fb3e588 AC |
1171 | an inserted breakpoint. This actually makes things |
1172 | easier. */ | |
8aad930b AC |
1173 | if (singlestep_breakpoints_inserted_p) |
1174 | /* When software single stepping, the instruction at [prev_pc] | |
1175 | is never a breakpoint, but the instruction following | |
1176 | [prev_pc] (in program execution order) always is. Assume | |
1177 | that following instruction was reached and hence a software | |
1178 | breakpoint was hit. */ | |
1179 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1180 | else if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1181 | /* The inferior was free running (i.e., no single-step | |
1182 | breakpoints inserted) and it hit a software breakpoint. */ | |
1183 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1184 | } | |
1185 | else | |
1186 | { | |
1187 | /* When using hardware single-step, a SIGTRAP is reported for | |
8fb3e588 AC |
1188 | both a completed single-step and a software breakpoint. Need |
1189 | to differentiate between the two as the latter needs | |
1190 | adjusting but the former does not. */ | |
8aad930b AC |
1191 | if (currently_stepping (ecs)) |
1192 | { | |
1193 | if (prev_pc == breakpoint_pc | |
1194 | && software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1195 | /* Hardware single-stepped a software breakpoint (as | |
1196 | occures when the inferior is resumed with PC pointing | |
1197 | at not-yet-hit software breakpoint). Since the | |
1198 | breakpoint really is executed, the inferior needs to be | |
1199 | backed up to the breakpoint address. */ | |
1200 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1201 | } | |
1202 | else | |
1203 | { | |
1204 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1205 | /* The inferior was free running (i.e., no hardware | |
1206 | single-step and no possibility of a false SIGTRAP) and | |
1207 | hit a software breakpoint. */ | |
1208 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1209 | } | |
1210 | } | |
4fa8626c DJ |
1211 | } |
1212 | ||
cd0fc7c3 SS |
1213 | /* Given an execution control state that has been freshly filled in |
1214 | by an event from the inferior, figure out what it means and take | |
1215 | appropriate action. */ | |
c906108c | 1216 | |
7270d8f2 OF |
1217 | int stepped_after_stopped_by_watchpoint; |
1218 | ||
cd0fc7c3 | 1219 | void |
96baa820 | 1220 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1221 | { |
65e82032 AC |
1222 | /* NOTE: cagney/2003-03-28: If you're looking at this code and |
1223 | thinking that the variable stepped_after_stopped_by_watchpoint | |
1224 | isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT, | |
1225 | defined in the file "config/pa/nm-hppah.h", accesses the variable | |
1226 | indirectly. Mutter something rude about the HP merge. */ | |
c8edd8b4 | 1227 | int sw_single_step_trap_p = 0; |
8fb3e588 | 1228 | int stopped_by_watchpoint = -1; /* Mark as unknown. */ |
cd0fc7c3 | 1229 | |
e02bc4cc | 1230 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1231 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1232 | target_last_waitstatus = *ecs->wp; |
1233 | ||
4fa8626c DJ |
1234 | adjust_pc_after_break (ecs); |
1235 | ||
488f131b JB |
1236 | switch (ecs->infwait_state) |
1237 | { | |
1238 | case infwait_thread_hop_state: | |
527159b7 RC |
1239 | if (debug_infrun) |
1240 | printf_unfiltered ("infrun: infwait_thread_hop_state\n"); | |
488f131b JB |
1241 | /* Cancel the waiton_ptid. */ |
1242 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 AC |
1243 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1244 | is serviced in this loop, below. */ | |
1245 | if (ecs->enable_hw_watchpoints_after_wait) | |
1246 | { | |
1247 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1248 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1249 | } | |
1250 | stepped_after_stopped_by_watchpoint = 0; | |
1251 | break; | |
b83266a0 | 1252 | |
488f131b | 1253 | case infwait_normal_state: |
527159b7 RC |
1254 | if (debug_infrun) |
1255 | printf_unfiltered ("infrun: infwait_normal_state\n"); | |
488f131b JB |
1256 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1257 | is serviced in this loop, below. */ | |
1258 | if (ecs->enable_hw_watchpoints_after_wait) | |
1259 | { | |
1260 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1261 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1262 | } | |
1263 | stepped_after_stopped_by_watchpoint = 0; | |
1264 | break; | |
b83266a0 | 1265 | |
488f131b | 1266 | case infwait_nullified_state: |
527159b7 RC |
1267 | if (debug_infrun) |
1268 | printf_unfiltered ("infrun: infwait_nullified_state\n"); | |
65e82032 | 1269 | stepped_after_stopped_by_watchpoint = 0; |
488f131b | 1270 | break; |
b83266a0 | 1271 | |
488f131b | 1272 | case infwait_nonstep_watch_state: |
527159b7 RC |
1273 | if (debug_infrun) |
1274 | printf_unfiltered ("infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 1275 | insert_breakpoints (); |
c906108c | 1276 | |
488f131b JB |
1277 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1278 | handle things like signals arriving and other things happening | |
1279 | in combination correctly? */ | |
1280 | stepped_after_stopped_by_watchpoint = 1; | |
1281 | break; | |
65e82032 AC |
1282 | |
1283 | default: | |
1284 | internal_error (__FILE__, __LINE__, "bad switch"); | |
488f131b JB |
1285 | } |
1286 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1287 | |
488f131b | 1288 | flush_cached_frames (); |
c906108c | 1289 | |
488f131b | 1290 | /* If it's a new process, add it to the thread database */ |
c906108c | 1291 | |
488f131b | 1292 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
b9b5d7ea | 1293 | && !ptid_equal (ecs->ptid, minus_one_ptid) |
488f131b JB |
1294 | && !in_thread_list (ecs->ptid)); |
1295 | ||
1296 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1297 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1298 | { | |
1299 | add_thread (ecs->ptid); | |
c906108c | 1300 | |
488f131b JB |
1301 | ui_out_text (uiout, "[New "); |
1302 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1303 | ui_out_text (uiout, "]\n"); | |
488f131b | 1304 | } |
c906108c | 1305 | |
488f131b JB |
1306 | switch (ecs->ws.kind) |
1307 | { | |
1308 | case TARGET_WAITKIND_LOADED: | |
527159b7 RC |
1309 | if (debug_infrun) |
1310 | printf_unfiltered ("infrun: TARGET_WAITKIND_LOADED\n"); | |
488f131b JB |
1311 | /* Ignore gracefully during startup of the inferior, as it |
1312 | might be the shell which has just loaded some objects, | |
1313 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1314 | #ifdef SOLIB_ADD |
c0236d92 | 1315 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1316 | { |
1317 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1318 | breakpoint addresses via breakpoint_re_set. */ | |
1319 | if (breakpoints_inserted) | |
1320 | remove_breakpoints (); | |
c906108c | 1321 | |
488f131b JB |
1322 | /* Check for any newly added shared libraries if we're |
1323 | supposed to be adding them automatically. Switch | |
1324 | terminal for any messages produced by | |
1325 | breakpoint_re_set. */ | |
1326 | target_terminal_ours_for_output (); | |
aff6338a | 1327 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
1328 | stack's section table is kept up-to-date. Architectures, |
1329 | (e.g., PPC64), use the section table to perform | |
1330 | operations such as address => section name and hence | |
1331 | require the table to contain all sections (including | |
1332 | those found in shared libraries). */ | |
aff6338a | 1333 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
1334 | exec_ops to SOLIB_ADD. This is because current GDB is |
1335 | only tooled to propagate section_table changes out from | |
1336 | the "current_target" (see target_resize_to_sections), and | |
1337 | not up from the exec stratum. This, of course, isn't | |
1338 | right. "infrun.c" should only interact with the | |
1339 | exec/process stratum, instead relying on the target stack | |
1340 | to propagate relevant changes (stop, section table | |
1341 | changed, ...) up to other layers. */ | |
aff6338a | 1342 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
1343 | target_terminal_inferior (); |
1344 | ||
1345 | /* Reinsert breakpoints and continue. */ | |
1346 | if (breakpoints_inserted) | |
1347 | insert_breakpoints (); | |
1348 | } | |
c906108c | 1349 | #endif |
488f131b JB |
1350 | resume (0, TARGET_SIGNAL_0); |
1351 | prepare_to_wait (ecs); | |
1352 | return; | |
c5aa993b | 1353 | |
488f131b | 1354 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 RC |
1355 | if (debug_infrun) |
1356 | printf_unfiltered ("infrun: TARGET_WAITKIND_SPURIOUS\n"); | |
488f131b JB |
1357 | resume (0, TARGET_SIGNAL_0); |
1358 | prepare_to_wait (ecs); | |
1359 | return; | |
c5aa993b | 1360 | |
488f131b | 1361 | case TARGET_WAITKIND_EXITED: |
527159b7 RC |
1362 | if (debug_infrun) |
1363 | printf_unfiltered ("infrun: TARGET_WAITKIND_EXITED\n"); | |
488f131b JB |
1364 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1365 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1366 | ||
1367 | /* Record the exit code in the convenience variable $_exitcode, so | |
1368 | that the user can inspect this again later. */ | |
1369 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1370 | value_from_longest (builtin_type_int, | |
1371 | (LONGEST) ecs->ws.value.integer)); | |
1372 | gdb_flush (gdb_stdout); | |
1373 | target_mourn_inferior (); | |
1374 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1375 | stop_print_frame = 0; | |
1376 | stop_stepping (ecs); | |
1377 | return; | |
c5aa993b | 1378 | |
488f131b | 1379 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 RC |
1380 | if (debug_infrun) |
1381 | printf_unfiltered ("infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
488f131b JB |
1382 | stop_print_frame = 0; |
1383 | stop_signal = ecs->ws.value.sig; | |
1384 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1385 | |
488f131b JB |
1386 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1387 | reach here unless the inferior is dead. However, for years | |
1388 | target_kill() was called here, which hints that fatal signals aren't | |
1389 | really fatal on some systems. If that's true, then some changes | |
1390 | may be needed. */ | |
1391 | target_mourn_inferior (); | |
c906108c | 1392 | |
488f131b JB |
1393 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1394 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1395 | stop_stepping (ecs); | |
1396 | return; | |
c906108c | 1397 | |
488f131b JB |
1398 | /* The following are the only cases in which we keep going; |
1399 | the above cases end in a continue or goto. */ | |
1400 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1401 | case TARGET_WAITKIND_VFORKED: |
527159b7 RC |
1402 | if (debug_infrun) |
1403 | printf_unfiltered ("infrun: TARGET_WAITKIND_FORKED\n"); | |
488f131b JB |
1404 | stop_signal = TARGET_SIGNAL_TRAP; |
1405 | pending_follow.kind = ecs->ws.kind; | |
1406 | ||
8e7d2c16 DJ |
1407 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1408 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1409 | |
488f131b | 1410 | stop_pc = read_pc (); |
675bf4cb | 1411 | |
00d4360e | 1412 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1413 | |
488f131b | 1414 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1415 | |
1416 | /* If no catchpoint triggered for this, then keep going. */ | |
1417 | if (ecs->random_signal) | |
1418 | { | |
1419 | stop_signal = TARGET_SIGNAL_0; | |
1420 | keep_going (ecs); | |
1421 | return; | |
1422 | } | |
488f131b JB |
1423 | goto process_event_stop_test; |
1424 | ||
1425 | case TARGET_WAITKIND_EXECD: | |
527159b7 RC |
1426 | if (debug_infrun) |
1427 | printf_unfiltered ("infrun: TARGET_WAITKIND_EXECED\n"); | |
488f131b JB |
1428 | stop_signal = TARGET_SIGNAL_TRAP; |
1429 | ||
7d2830a3 | 1430 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
8fb3e588 AC |
1431 | target_wait function. Until then following vfork on HP/UX 10.20 |
1432 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1433 | /* Is this a target which reports multiple exec events per actual |
1434 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1435 | ignore all but the last one. Just resume the exec'r, and wait | |
1436 | for the next exec event. */ | |
1437 | if (inferior_ignoring_leading_exec_events) | |
1438 | { | |
1439 | inferior_ignoring_leading_exec_events--; | |
1440 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1441 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event. | |
1442 | parent_pid); | |
1443 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); | |
1444 | prepare_to_wait (ecs); | |
1445 | return; | |
1446 | } | |
1447 | inferior_ignoring_leading_exec_events = | |
1448 | target_reported_exec_events_per_exec_call () - 1; | |
1449 | ||
1450 | pending_follow.execd_pathname = | |
1451 | savestring (ecs->ws.value.execd_pathname, | |
1452 | strlen (ecs->ws.value.execd_pathname)); | |
1453 | ||
488f131b JB |
1454 | /* This causes the eventpoints and symbol table to be reset. Must |
1455 | do this now, before trying to determine whether to stop. */ | |
1456 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1457 | xfree (pending_follow.execd_pathname); | |
c906108c | 1458 | |
488f131b JB |
1459 | stop_pc = read_pc_pid (ecs->ptid); |
1460 | ecs->saved_inferior_ptid = inferior_ptid; | |
1461 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1462 | |
00d4360e | 1463 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1464 | |
488f131b JB |
1465 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1466 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 DJ |
1467 | |
1468 | /* If no catchpoint triggered for this, then keep going. */ | |
1469 | if (ecs->random_signal) | |
1470 | { | |
1471 | stop_signal = TARGET_SIGNAL_0; | |
1472 | keep_going (ecs); | |
1473 | return; | |
1474 | } | |
488f131b JB |
1475 | goto process_event_stop_test; |
1476 | ||
1477 | /* These syscall events are returned on HP-UX, as part of its | |
1478 | implementation of page-protection-based "hardware" watchpoints. | |
1479 | HP-UX has unfortunate interactions between page-protections and | |
1480 | some system calls. Our solution is to disable hardware watches | |
1481 | when a system call is entered, and reenable them when the syscall | |
1482 | completes. The downside of this is that we may miss the precise | |
1483 | point at which a watched piece of memory is modified. "Oh well." | |
1484 | ||
1485 | Note that we may have multiple threads running, which may each | |
1486 | enter syscalls at roughly the same time. Since we don't have a | |
1487 | good notion currently of whether a watched piece of memory is | |
1488 | thread-private, we'd best not have any page-protections active | |
1489 | when any thread is in a syscall. Thus, we only want to reenable | |
1490 | hardware watches when no threads are in a syscall. | |
1491 | ||
1492 | Also, be careful not to try to gather much state about a thread | |
1493 | that's in a syscall. It's frequently a losing proposition. */ | |
1494 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
527159b7 RC |
1495 | if (debug_infrun) |
1496 | printf_unfiltered ("infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
488f131b JB |
1497 | number_of_threads_in_syscalls++; |
1498 | if (number_of_threads_in_syscalls == 1) | |
1499 | { | |
1500 | TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1501 | } | |
1502 | resume (0, TARGET_SIGNAL_0); | |
1503 | prepare_to_wait (ecs); | |
1504 | return; | |
c906108c | 1505 | |
488f131b JB |
1506 | /* Before examining the threads further, step this thread to |
1507 | get it entirely out of the syscall. (We get notice of the | |
1508 | event when the thread is just on the verge of exiting a | |
1509 | syscall. Stepping one instruction seems to get it back | |
1510 | into user code.) | |
c906108c | 1511 | |
488f131b JB |
1512 | Note that although the logical place to reenable h/w watches |
1513 | is here, we cannot. We cannot reenable them before stepping | |
1514 | the thread (this causes the next wait on the thread to hang). | |
c4093a6a | 1515 | |
488f131b JB |
1516 | Nor can we enable them after stepping until we've done a wait. |
1517 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait | |
1518 | here, which will be serviced immediately after the target | |
1519 | is waited on. */ | |
1520 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
527159b7 RC |
1521 | if (debug_infrun) |
1522 | printf_unfiltered ("infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
488f131b JB |
1523 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
1524 | ||
1525 | if (number_of_threads_in_syscalls > 0) | |
1526 | { | |
1527 | number_of_threads_in_syscalls--; | |
1528 | ecs->enable_hw_watchpoints_after_wait = | |
1529 | (number_of_threads_in_syscalls == 0); | |
1530 | } | |
1531 | prepare_to_wait (ecs); | |
1532 | return; | |
c906108c | 1533 | |
488f131b | 1534 | case TARGET_WAITKIND_STOPPED: |
527159b7 RC |
1535 | if (debug_infrun) |
1536 | printf_unfiltered ("infrun: TARGET_WAITKIND_STOPPED\n"); | |
488f131b JB |
1537 | stop_signal = ecs->ws.value.sig; |
1538 | break; | |
c906108c | 1539 | |
488f131b JB |
1540 | /* We had an event in the inferior, but we are not interested |
1541 | in handling it at this level. The lower layers have already | |
8e7d2c16 | 1542 | done what needs to be done, if anything. |
8fb3e588 AC |
1543 | |
1544 | One of the possible circumstances for this is when the | |
1545 | inferior produces output for the console. The inferior has | |
1546 | not stopped, and we are ignoring the event. Another possible | |
1547 | circumstance is any event which the lower level knows will be | |
1548 | reported multiple times without an intervening resume. */ | |
488f131b | 1549 | case TARGET_WAITKIND_IGNORE: |
527159b7 RC |
1550 | if (debug_infrun) |
1551 | printf_unfiltered ("infrun: TARGET_WAITKIND_IGNORE\n"); | |
8e7d2c16 | 1552 | prepare_to_wait (ecs); |
488f131b JB |
1553 | return; |
1554 | } | |
c906108c | 1555 | |
488f131b JB |
1556 | /* We may want to consider not doing a resume here in order to give |
1557 | the user a chance to play with the new thread. It might be good | |
1558 | to make that a user-settable option. */ | |
c906108c | 1559 | |
488f131b JB |
1560 | /* At this point, all threads are stopped (happens automatically in |
1561 | either the OS or the native code). Therefore we need to continue | |
1562 | all threads in order to make progress. */ | |
1563 | if (ecs->new_thread_event) | |
1564 | { | |
1565 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1566 | prepare_to_wait (ecs); | |
1567 | return; | |
1568 | } | |
c906108c | 1569 | |
488f131b JB |
1570 | stop_pc = read_pc_pid (ecs->ptid); |
1571 | ||
527159b7 RC |
1572 | if (debug_infrun) |
1573 | printf_unfiltered ("infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc)); | |
1574 | ||
9f976b41 DJ |
1575 | if (stepping_past_singlestep_breakpoint) |
1576 | { | |
8fb3e588 AC |
1577 | gdb_assert (SOFTWARE_SINGLE_STEP_P () |
1578 | && singlestep_breakpoints_inserted_p); | |
9f976b41 DJ |
1579 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
1580 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1581 | ||
1582 | stepping_past_singlestep_breakpoint = 0; | |
1583 | ||
1584 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
1585 | breakpoint, or stopped for some other reason. It would be nice if |
1586 | we could tell, but we can't reliably. */ | |
9f976b41 | 1587 | if (stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 1588 | { |
527159b7 RC |
1589 | if (debug_infrun) |
1590 | printf_unfiltered ("infrun: stepping_past_singlestep_breakpoint\n"); | |
9f976b41 DJ |
1591 | /* Pull the single step breakpoints out of the target. */ |
1592 | SOFTWARE_SINGLE_STEP (0, 0); | |
1593 | singlestep_breakpoints_inserted_p = 0; | |
1594 | ||
1595 | ecs->random_signal = 0; | |
1596 | ||
1597 | ecs->ptid = saved_singlestep_ptid; | |
1598 | context_switch (ecs); | |
9a4105ab AC |
1599 | if (deprecated_context_hook) |
1600 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1601 | |
1602 | resume (1, TARGET_SIGNAL_0); | |
1603 | prepare_to_wait (ecs); | |
1604 | return; | |
1605 | } | |
1606 | } | |
1607 | ||
1608 | stepping_past_singlestep_breakpoint = 0; | |
1609 | ||
488f131b JB |
1610 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1611 | another thread. If so, then step that thread past the breakpoint, | |
1612 | and continue it. */ | |
1613 | ||
1614 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1615 | { | |
9f976b41 DJ |
1616 | int thread_hop_needed = 0; |
1617 | ||
f8d40ec8 JB |
1618 | /* Check if a regular breakpoint has been hit before checking |
1619 | for a potential single step breakpoint. Otherwise, GDB will | |
1620 | not see this breakpoint hit when stepping onto breakpoints. */ | |
4fa8626c | 1621 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
488f131b | 1622 | { |
c5aa993b | 1623 | ecs->random_signal = 0; |
4fa8626c | 1624 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1625 | thread_hop_needed = 1; |
1626 | } | |
1627 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1628 | { | |
1629 | ecs->random_signal = 0; | |
1630 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1631 | change when we go from single-threaded to multi-threaded. If | |
1632 | the singlestep_ptid is still in the list, assume that it is | |
1633 | really different from ecs->ptid. */ | |
1634 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1635 | && in_thread_list (singlestep_ptid)) | |
1636 | { | |
1637 | thread_hop_needed = 1; | |
1638 | stepping_past_singlestep_breakpoint = 1; | |
1639 | saved_singlestep_ptid = singlestep_ptid; | |
1640 | } | |
1641 | } | |
1642 | ||
1643 | if (thread_hop_needed) | |
8fb3e588 AC |
1644 | { |
1645 | int remove_status; | |
1646 | ||
527159b7 RC |
1647 | if (debug_infrun) |
1648 | printf_unfiltered ("infrun: thread_hop_needed\n"); | |
1649 | ||
8fb3e588 AC |
1650 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1651 | Just continue. */ | |
1652 | ||
1653 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
488f131b | 1654 | { |
8fb3e588 AC |
1655 | /* Pull the single step breakpoints out of the target. */ |
1656 | SOFTWARE_SINGLE_STEP (0, 0); | |
1657 | singlestep_breakpoints_inserted_p = 0; | |
1658 | } | |
1659 | ||
1660 | remove_status = remove_breakpoints (); | |
1661 | /* Did we fail to remove breakpoints? If so, try | |
1662 | to set the PC past the bp. (There's at least | |
1663 | one situation in which we can fail to remove | |
1664 | the bp's: On HP-UX's that use ttrace, we can't | |
1665 | change the address space of a vforking child | |
1666 | process until the child exits (well, okay, not | |
1667 | then either :-) or execs. */ | |
1668 | if (remove_status != 0) | |
1669 | { | |
1670 | /* FIXME! This is obviously non-portable! */ | |
1671 | write_pc_pid (stop_pc + 4, ecs->ptid); | |
1672 | /* We need to restart all the threads now, | |
1673 | * unles we're running in scheduler-locked mode. | |
1674 | * Use currently_stepping to determine whether to | |
1675 | * step or continue. | |
1676 | */ | |
1677 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1678 | if (scheduler_mode == schedlock_on) | |
1679 | target_resume (ecs->ptid, | |
1680 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
488f131b | 1681 | else |
8fb3e588 AC |
1682 | target_resume (RESUME_ALL, |
1683 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1684 | prepare_to_wait (ecs); | |
1685 | return; | |
1686 | } | |
1687 | else | |
1688 | { /* Single step */ | |
1689 | breakpoints_inserted = 0; | |
1690 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1691 | context_switch (ecs); | |
1692 | ecs->waiton_ptid = ecs->ptid; | |
1693 | ecs->wp = &(ecs->ws); | |
1694 | ecs->another_trap = 1; | |
1695 | ||
1696 | ecs->infwait_state = infwait_thread_hop_state; | |
1697 | keep_going (ecs); | |
1698 | registers_changed (); | |
1699 | return; | |
1700 | } | |
488f131b | 1701 | } |
f8d40ec8 | 1702 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
1703 | { |
1704 | sw_single_step_trap_p = 1; | |
1705 | ecs->random_signal = 0; | |
1706 | } | |
488f131b JB |
1707 | } |
1708 | else | |
1709 | ecs->random_signal = 1; | |
c906108c | 1710 | |
488f131b | 1711 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1712 | so, then switch to that thread. */ |
1713 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1714 | { |
527159b7 RC |
1715 | if (debug_infrun) |
1716 | printf_unfiltered ("infrun: context switch\n"); | |
1717 | ||
488f131b | 1718 | context_switch (ecs); |
c5aa993b | 1719 | |
9a4105ab AC |
1720 | if (deprecated_context_hook) |
1721 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
c5aa993b | 1722 | |
488f131b JB |
1723 | flush_cached_frames (); |
1724 | } | |
c906108c | 1725 | |
488f131b JB |
1726 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1727 | { | |
1728 | /* Pull the single step breakpoints out of the target. */ | |
1729 | SOFTWARE_SINGLE_STEP (0, 0); | |
1730 | singlestep_breakpoints_inserted_p = 0; | |
1731 | } | |
c906108c | 1732 | |
488f131b | 1733 | /* If PC is pointing at a nullified instruction, then step beyond |
3ca64954 RC |
1734 | it before deciding what to do. This is required when we are stepping |
1735 | through a function where the last instruction is a branch with a | |
1736 | nullified instruction in the delay slot that belongs to the next | |
1737 | line (which may be in a different function altogether). */ | |
c906108c | 1738 | |
3ca64954 | 1739 | if (gdbarch_instruction_nullified (current_gdbarch, current_regcache)) |
488f131b | 1740 | { |
527159b7 | 1741 | if (debug_infrun) |
3ca64954 | 1742 | printf_unfiltered ("infrun: instruction nullified\n"); |
488f131b JB |
1743 | registers_changed (); |
1744 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
c906108c | 1745 | |
488f131b JB |
1746 | /* We may have received a signal that we want to pass to |
1747 | the inferior; therefore, we must not clobber the waitstatus | |
1748 | in WS. */ | |
c906108c | 1749 | |
488f131b JB |
1750 | ecs->infwait_state = infwait_nullified_state; |
1751 | ecs->waiton_ptid = ecs->ptid; | |
1752 | ecs->wp = &(ecs->tmpstatus); | |
1753 | prepare_to_wait (ecs); | |
1754 | return; | |
1755 | } | |
c906108c | 1756 | |
488f131b JB |
1757 | /* It may not be necessary to disable the watchpoint to stop over |
1758 | it. For example, the PA can (with some kernel cooperation) | |
1759 | single step over a watchpoint without disabling the watchpoint. */ | |
1760 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1761 | { | |
527159b7 RC |
1762 | if (debug_infrun) |
1763 | printf_unfiltered ("infrun: STOPPED_BY_WATCHPOINT\n"); | |
488f131b JB |
1764 | resume (1, 0); |
1765 | prepare_to_wait (ecs); | |
1766 | return; | |
1767 | } | |
c906108c | 1768 | |
488f131b JB |
1769 | /* It is far more common to need to disable a watchpoint to step |
1770 | the inferior over it. FIXME. What else might a debug | |
1771 | register or page protection watchpoint scheme need here? */ | |
1772 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1773 | { | |
1774 | /* At this point, we are stopped at an instruction which has | |
1775 | attempted to write to a piece of memory under control of | |
1776 | a watchpoint. The instruction hasn't actually executed | |
1777 | yet. If we were to evaluate the watchpoint expression | |
1778 | now, we would get the old value, and therefore no change | |
1779 | would seem to have occurred. | |
1780 | ||
1781 | In order to make watchpoints work `right', we really need | |
1782 | to complete the memory write, and then evaluate the | |
1783 | watchpoint expression. The following code does that by | |
1784 | removing the watchpoint (actually, all watchpoints and | |
1785 | breakpoints), single-stepping the target, re-inserting | |
1786 | watchpoints, and then falling through to let normal | |
1787 | single-step processing handle proceed. Since this | |
1788 | includes evaluating watchpoints, things will come to a | |
1789 | stop in the correct manner. */ | |
1790 | ||
527159b7 RC |
1791 | if (debug_infrun) |
1792 | printf_unfiltered ("infrun: STOPPED_BY_WATCHPOINT\n"); | |
488f131b JB |
1793 | remove_breakpoints (); |
1794 | registers_changed (); | |
1795 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1796 | |
488f131b JB |
1797 | ecs->waiton_ptid = ecs->ptid; |
1798 | ecs->wp = &(ecs->ws); | |
1799 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1800 | prepare_to_wait (ecs); | |
1801 | return; | |
1802 | } | |
1803 | ||
1804 | /* It may be possible to simply continue after a watchpoint. */ | |
1805 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
00d4360e | 1806 | stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
488f131b JB |
1807 | |
1808 | ecs->stop_func_start = 0; | |
1809 | ecs->stop_func_end = 0; | |
1810 | ecs->stop_func_name = 0; | |
1811 | /* Don't care about return value; stop_func_start and stop_func_name | |
1812 | will both be 0 if it doesn't work. */ | |
1813 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1814 | &ecs->stop_func_start, &ecs->stop_func_end); | |
782263ab | 1815 | ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET; |
488f131b JB |
1816 | ecs->another_trap = 0; |
1817 | bpstat_clear (&stop_bpstat); | |
1818 | stop_step = 0; | |
1819 | stop_stack_dummy = 0; | |
1820 | stop_print_frame = 1; | |
1821 | ecs->random_signal = 0; | |
1822 | stopped_by_random_signal = 0; | |
1823 | breakpoints_failed = 0; | |
1824 | ||
3352ef37 AC |
1825 | if (stop_signal == TARGET_SIGNAL_TRAP |
1826 | && trap_expected | |
1827 | && gdbarch_single_step_through_delay_p (current_gdbarch) | |
1828 | && currently_stepping (ecs)) | |
1829 | { | |
1830 | /* We're trying to step of a breakpoint. Turns out that we're | |
1831 | also on an instruction that needs to be stepped multiple | |
1832 | times before it's been fully executing. E.g., architectures | |
1833 | with a delay slot. It needs to be stepped twice, once for | |
1834 | the instruction and once for the delay slot. */ | |
1835 | int step_through_delay | |
1836 | = gdbarch_single_step_through_delay (current_gdbarch, | |
1837 | get_current_frame ()); | |
527159b7 RC |
1838 | if (debug_infrun && step_through_delay) |
1839 | printf_unfiltered ("infrun: step through delay\n"); | |
3352ef37 AC |
1840 | if (step_range_end == 0 && step_through_delay) |
1841 | { | |
1842 | /* The user issued a continue when stopped at a breakpoint. | |
1843 | Set up for another trap and get out of here. */ | |
1844 | ecs->another_trap = 1; | |
1845 | keep_going (ecs); | |
1846 | return; | |
1847 | } | |
1848 | else if (step_through_delay) | |
1849 | { | |
1850 | /* The user issued a step when stopped at a breakpoint. | |
1851 | Maybe we should stop, maybe we should not - the delay | |
1852 | slot *might* correspond to a line of source. In any | |
1853 | case, don't decide that here, just set ecs->another_trap, | |
1854 | making sure we single-step again before breakpoints are | |
1855 | re-inserted. */ | |
1856 | ecs->another_trap = 1; | |
1857 | } | |
1858 | } | |
1859 | ||
488f131b JB |
1860 | /* Look at the cause of the stop, and decide what to do. |
1861 | The alternatives are: | |
1862 | 1) break; to really stop and return to the debugger, | |
1863 | 2) drop through to start up again | |
1864 | (set ecs->another_trap to 1 to single step once) | |
1865 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1866 | will be made according to the signal handling tables. */ | |
1867 | ||
1868 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1869 | that have to do with the program's own actions. Note that |
1870 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1871 | on the operating system version. Here we detect when a SIGILL or | |
1872 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1873 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1874 | when we're trying to execute a breakpoint instruction on a | |
1875 | non-executable stack. This happens for call dummy breakpoints | |
1876 | for architectures like SPARC that place call dummies on the | |
1877 | stack. */ | |
488f131b JB |
1878 | |
1879 | if (stop_signal == TARGET_SIGNAL_TRAP | |
8fb3e588 AC |
1880 | || (breakpoints_inserted |
1881 | && (stop_signal == TARGET_SIGNAL_ILL | |
1882 | || stop_signal == TARGET_SIGNAL_SEGV | |
1883 | || stop_signal == TARGET_SIGNAL_EMT)) | |
1884 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1885 | { |
1886 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1887 | { | |
527159b7 RC |
1888 | if (debug_infrun) |
1889 | printf_unfiltered ("infrun: stopped\n"); | |
488f131b JB |
1890 | stop_print_frame = 0; |
1891 | stop_stepping (ecs); | |
1892 | return; | |
1893 | } | |
c54cfec8 EZ |
1894 | |
1895 | /* This is originated from start_remote(), start_inferior() and | |
1896 | shared libraries hook functions. */ | |
c0236d92 | 1897 | if (stop_soon == STOP_QUIETLY) |
488f131b | 1898 | { |
527159b7 RC |
1899 | if (debug_infrun) |
1900 | printf_unfiltered ("infrun: quietly stopped\n"); | |
488f131b JB |
1901 | stop_stepping (ecs); |
1902 | return; | |
1903 | } | |
1904 | ||
c54cfec8 EZ |
1905 | /* This originates from attach_command(). We need to overwrite |
1906 | the stop_signal here, because some kernels don't ignore a | |
1907 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1908 | See more comments in inferior.h. */ | |
c0236d92 | 1909 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1910 | { |
1911 | stop_stepping (ecs); | |
1912 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1913 | stop_signal = TARGET_SIGNAL_0; | |
1914 | return; | |
1915 | } | |
1916 | ||
d303a6c7 AC |
1917 | /* Don't even think about breakpoints if just proceeded over a |
1918 | breakpoint. */ | |
1919 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) | |
527159b7 RC |
1920 | { |
1921 | if (debug_infrun) | |
1922 | printf_unfiltered ("infrun: trap expected\n"); | |
1923 | bpstat_clear (&stop_bpstat); | |
1924 | } | |
488f131b JB |
1925 | else |
1926 | { | |
1927 | /* See if there is a breakpoint at the current PC. */ | |
8fb3e588 | 1928 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
00d4360e | 1929 | stopped_by_watchpoint); |
488f131b | 1930 | |
488f131b JB |
1931 | /* Following in case break condition called a |
1932 | function. */ | |
1933 | stop_print_frame = 1; | |
1934 | } | |
1935 | ||
73dd234f | 1936 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
1937 | at one stage in the past included checks for an inferior |
1938 | function call's call dummy's return breakpoint. The original | |
1939 | comment, that went with the test, read: | |
73dd234f | 1940 | |
8fb3e588 AC |
1941 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
1942 | another signal besides SIGTRAP, so check here as well as | |
1943 | above.'' | |
73dd234f AC |
1944 | |
1945 | If someone ever tries to get get call dummys on a | |
1946 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
1947 | with something like a SIGSEGV), then those tests might need |
1948 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 1949 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
1950 | suspect that it won't be the case. |
1951 | ||
8fb3e588 AC |
1952 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
1953 | be necessary for call dummies on a non-executable stack on | |
1954 | SPARC. */ | |
73dd234f | 1955 | |
488f131b JB |
1956 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1957 | ecs->random_signal | |
1958 | = !(bpstat_explains_signal (stop_bpstat) | |
1959 | || trap_expected | |
488f131b | 1960 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
1961 | else |
1962 | { | |
73dd234f | 1963 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
1964 | if (!ecs->random_signal) |
1965 | stop_signal = TARGET_SIGNAL_TRAP; | |
1966 | } | |
1967 | } | |
1968 | ||
1969 | /* When we reach this point, we've pretty much decided | |
1970 | that the reason for stopping must've been a random | |
1971 | (unexpected) signal. */ | |
1972 | ||
1973 | else | |
1974 | ecs->random_signal = 1; | |
488f131b | 1975 | |
04e68871 | 1976 | process_event_stop_test: |
488f131b JB |
1977 | /* For the program's own signals, act according to |
1978 | the signal handling tables. */ | |
1979 | ||
1980 | if (ecs->random_signal) | |
1981 | { | |
1982 | /* Signal not for debugging purposes. */ | |
1983 | int printed = 0; | |
1984 | ||
527159b7 RC |
1985 | if (debug_infrun) |
1986 | printf_unfiltered ("infrun: random signal %d\n", stop_signal); | |
1987 | ||
488f131b JB |
1988 | stopped_by_random_signal = 1; |
1989 | ||
1990 | if (signal_print[stop_signal]) | |
1991 | { | |
1992 | printed = 1; | |
1993 | target_terminal_ours_for_output (); | |
1994 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
1995 | } | |
1996 | if (signal_stop[stop_signal]) | |
1997 | { | |
1998 | stop_stepping (ecs); | |
1999 | return; | |
2000 | } | |
2001 | /* If not going to stop, give terminal back | |
2002 | if we took it away. */ | |
2003 | else if (printed) | |
2004 | target_terminal_inferior (); | |
2005 | ||
2006 | /* Clear the signal if it should not be passed. */ | |
2007 | if (signal_program[stop_signal] == 0) | |
2008 | stop_signal = TARGET_SIGNAL_0; | |
2009 | ||
68f53502 AC |
2010 | if (prev_pc == read_pc () |
2011 | && !breakpoints_inserted | |
2012 | && breakpoint_here_p (read_pc ()) | |
2013 | && step_resume_breakpoint == NULL) | |
2014 | { | |
2015 | /* We were just starting a new sequence, attempting to | |
2016 | single-step off of a breakpoint and expecting a SIGTRAP. | |
2017 | Intead this signal arrives. This signal will take us out | |
2018 | of the stepping range so GDB needs to remember to, when | |
2019 | the signal handler returns, resume stepping off that | |
2020 | breakpoint. */ | |
2021 | /* To simplify things, "continue" is forced to use the same | |
2022 | code paths as single-step - set a breakpoint at the | |
2023 | signal return address and then, once hit, step off that | |
2024 | breakpoint. */ | |
44cbf7b5 | 2025 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
68f53502 AC |
2026 | ecs->step_after_step_resume_breakpoint = 1; |
2027 | } | |
2028 | else if (step_range_end != 0 | |
2029 | && stop_signal != TARGET_SIGNAL_0 | |
2030 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
2031 | && frame_id_eq (get_frame_id (get_current_frame ()), | |
2032 | step_frame_id)) | |
d303a6c7 AC |
2033 | { |
2034 | /* The inferior is about to take a signal that will take it | |
2035 | out of the single step range. Set a breakpoint at the | |
2036 | current PC (which is presumably where the signal handler | |
2037 | will eventually return) and then allow the inferior to | |
2038 | run free. | |
2039 | ||
2040 | Note that this is only needed for a signal delivered | |
2041 | while in the single-step range. Nested signals aren't a | |
2042 | problem as they eventually all return. */ | |
44cbf7b5 | 2043 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
d303a6c7 | 2044 | } |
488f131b JB |
2045 | keep_going (ecs); |
2046 | return; | |
2047 | } | |
2048 | ||
2049 | /* Handle cases caused by hitting a breakpoint. */ | |
2050 | { | |
2051 | CORE_ADDR jmp_buf_pc; | |
2052 | struct bpstat_what what; | |
2053 | ||
2054 | what = bpstat_what (stop_bpstat); | |
2055 | ||
2056 | if (what.call_dummy) | |
2057 | { | |
2058 | stop_stack_dummy = 1; | |
c5aa993b | 2059 | } |
c906108c | 2060 | |
488f131b | 2061 | switch (what.main_action) |
c5aa993b | 2062 | { |
488f131b JB |
2063 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2064 | /* If we hit the breakpoint at longjmp, disable it for the | |
2065 | duration of this command. Then, install a temporary | |
2066 | breakpoint at the target of the jmp_buf. */ | |
527159b7 RC |
2067 | if (debug_infrun) |
2068 | printf_unfiltered ("infrun: BPSTATE_WHAT_SET_LONGJMP_RESUME\n"); | |
488f131b JB |
2069 | disable_longjmp_breakpoint (); |
2070 | remove_breakpoints (); | |
2071 | breakpoints_inserted = 0; | |
2072 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 2073 | { |
488f131b | 2074 | keep_going (ecs); |
104c1213 | 2075 | return; |
c5aa993b | 2076 | } |
488f131b JB |
2077 | |
2078 | /* Need to blow away step-resume breakpoint, as it | |
2079 | interferes with us */ | |
2080 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2081 | { |
488f131b | 2082 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2083 | } |
c906108c | 2084 | |
8fb3e588 | 2085 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2086 | ecs->handling_longjmp = 1; /* FIXME */ |
2087 | keep_going (ecs); | |
2088 | return; | |
c906108c | 2089 | |
488f131b JB |
2090 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2091 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
527159b7 RC |
2092 | if (debug_infrun) |
2093 | printf_unfiltered ("infrun: BPSTATE_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
488f131b JB |
2094 | remove_breakpoints (); |
2095 | breakpoints_inserted = 0; | |
488f131b JB |
2096 | disable_longjmp_breakpoint (); |
2097 | ecs->handling_longjmp = 0; /* FIXME */ | |
2098 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2099 | break; | |
2100 | /* else fallthrough */ | |
2101 | ||
2102 | case BPSTAT_WHAT_SINGLE: | |
527159b7 RC |
2103 | if (debug_infrun) |
2104 | printf_unfiltered ("infrun: BPSTATE_WHAT_SINGLE\n"); | |
488f131b | 2105 | if (breakpoints_inserted) |
c5aa993b | 2106 | { |
488f131b | 2107 | remove_breakpoints (); |
c5aa993b | 2108 | } |
488f131b JB |
2109 | breakpoints_inserted = 0; |
2110 | ecs->another_trap = 1; | |
2111 | /* Still need to check other stuff, at least the case | |
2112 | where we are stepping and step out of the right range. */ | |
2113 | break; | |
c906108c | 2114 | |
488f131b | 2115 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 RC |
2116 | if (debug_infrun) |
2117 | printf_unfiltered ("infrun: BPSTATE_WHAT_STOP_NOISY\n"); | |
488f131b | 2118 | stop_print_frame = 1; |
c906108c | 2119 | |
d303a6c7 AC |
2120 | /* We are about to nuke the step_resume_breakpointt via the |
2121 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2122 | |
488f131b JB |
2123 | stop_stepping (ecs); |
2124 | return; | |
c5aa993b | 2125 | |
488f131b | 2126 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 RC |
2127 | if (debug_infrun) |
2128 | printf_unfiltered ("infrun: BPSTATE_WHAT_STOP_SILENT\n"); | |
488f131b | 2129 | stop_print_frame = 0; |
c5aa993b | 2130 | |
d303a6c7 AC |
2131 | /* We are about to nuke the step_resume_breakpoin via the |
2132 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2133 | |
488f131b | 2134 | stop_stepping (ecs); |
e441088d | 2135 | return; |
c5aa993b | 2136 | |
488f131b JB |
2137 | case BPSTAT_WHAT_STEP_RESUME: |
2138 | /* This proably demands a more elegant solution, but, yeah | |
2139 | right... | |
c5aa993b | 2140 | |
488f131b JB |
2141 | This function's use of the simple variable |
2142 | step_resume_breakpoint doesn't seem to accomodate | |
2143 | simultaneously active step-resume bp's, although the | |
2144 | breakpoint list certainly can. | |
c5aa993b | 2145 | |
488f131b JB |
2146 | If we reach here and step_resume_breakpoint is already |
2147 | NULL, then apparently we have multiple active | |
2148 | step-resume bp's. We'll just delete the breakpoint we | |
2149 | stopped at, and carry on. | |
2150 | ||
2151 | Correction: what the code currently does is delete a | |
2152 | step-resume bp, but it makes no effort to ensure that | |
2153 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2154 | |
527159b7 RC |
2155 | if (debug_infrun) |
2156 | printf_unfiltered ("infrun: BPSTATE_WHAT_STEP_RESUME\n"); | |
2157 | ||
488f131b JB |
2158 | if (step_resume_breakpoint == NULL) |
2159 | { | |
2160 | step_resume_breakpoint = | |
2161 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2162 | } | |
2163 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
68f53502 AC |
2164 | if (ecs->step_after_step_resume_breakpoint) |
2165 | { | |
2166 | /* Back when the step-resume breakpoint was inserted, we | |
2167 | were trying to single-step off a breakpoint. Go back | |
2168 | to doing that. */ | |
2169 | ecs->step_after_step_resume_breakpoint = 0; | |
2170 | remove_breakpoints (); | |
2171 | breakpoints_inserted = 0; | |
2172 | ecs->another_trap = 1; | |
2173 | keep_going (ecs); | |
2174 | return; | |
2175 | } | |
488f131b JB |
2176 | break; |
2177 | ||
2178 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
527159b7 RC |
2179 | if (debug_infrun) |
2180 | printf_unfiltered ("infrun: BPSTATE_WHAT_THROUGH_SIGTRAMP\n"); | |
488f131b JB |
2181 | /* If were waiting for a trap, hitting the step_resume_break |
2182 | doesn't count as getting it. */ | |
2183 | if (trap_expected) | |
2184 | ecs->another_trap = 1; | |
2185 | break; | |
2186 | ||
2187 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2188 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2189 | #ifdef SOLIB_ADD | |
c906108c | 2190 | { |
527159b7 RC |
2191 | if (debug_infrun) |
2192 | printf_unfiltered ("infrun: BPSTATE_WHAT_CHECK_SHLIBS\n"); | |
488f131b JB |
2193 | /* Remove breakpoints, we eventually want to step over the |
2194 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2195 | breakpoint addresses via breakpoint_re_set. */ | |
2196 | if (breakpoints_inserted) | |
2197 | remove_breakpoints (); | |
c5aa993b | 2198 | breakpoints_inserted = 0; |
488f131b JB |
2199 | |
2200 | /* Check for any newly added shared libraries if we're | |
2201 | supposed to be adding them automatically. Switch | |
2202 | terminal for any messages produced by | |
2203 | breakpoint_re_set. */ | |
2204 | target_terminal_ours_for_output (); | |
aff6338a | 2205 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
2206 | stack's section table is kept up-to-date. Architectures, |
2207 | (e.g., PPC64), use the section table to perform | |
2208 | operations such as address => section name and hence | |
2209 | require the table to contain all sections (including | |
2210 | those found in shared libraries). */ | |
aff6338a | 2211 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
2212 | exec_ops to SOLIB_ADD. This is because current GDB is |
2213 | only tooled to propagate section_table changes out from | |
2214 | the "current_target" (see target_resize_to_sections), and | |
2215 | not up from the exec stratum. This, of course, isn't | |
2216 | right. "infrun.c" should only interact with the | |
2217 | exec/process stratum, instead relying on the target stack | |
2218 | to propagate relevant changes (stop, section table | |
2219 | changed, ...) up to other layers. */ | |
aff6338a | 2220 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
2221 | target_terminal_inferior (); |
2222 | ||
2223 | /* Try to reenable shared library breakpoints, additional | |
2224 | code segments in shared libraries might be mapped in now. */ | |
2225 | re_enable_breakpoints_in_shlibs (); | |
2226 | ||
2227 | /* If requested, stop when the dynamic linker notifies | |
2228 | gdb of events. This allows the user to get control | |
2229 | and place breakpoints in initializer routines for | |
2230 | dynamically loaded objects (among other things). */ | |
877522db | 2231 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2232 | { |
488f131b | 2233 | stop_stepping (ecs); |
d4f3574e SS |
2234 | return; |
2235 | } | |
c5aa993b | 2236 | |
488f131b JB |
2237 | /* If we stopped due to an explicit catchpoint, then the |
2238 | (see above) call to SOLIB_ADD pulled in any symbols | |
2239 | from a newly-loaded library, if appropriate. | |
2240 | ||
2241 | We do want the inferior to stop, but not where it is | |
2242 | now, which is in the dynamic linker callback. Rather, | |
2243 | we would like it stop in the user's program, just after | |
2244 | the call that caused this catchpoint to trigger. That | |
2245 | gives the user a more useful vantage from which to | |
2246 | examine their program's state. */ | |
8fb3e588 AC |
2247 | else if (what.main_action |
2248 | == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2249 | { |
488f131b JB |
2250 | /* ??rehrauer: If I could figure out how to get the |
2251 | right return PC from here, we could just set a temp | |
2252 | breakpoint and resume. I'm not sure we can without | |
2253 | cracking open the dld's shared libraries and sniffing | |
2254 | their unwind tables and text/data ranges, and that's | |
2255 | not a terribly portable notion. | |
2256 | ||
2257 | Until that time, we must step the inferior out of the | |
2258 | dld callback, and also out of the dld itself (and any | |
2259 | code or stubs in libdld.sl, such as "shl_load" and | |
2260 | friends) until we reach non-dld code. At that point, | |
2261 | we can stop stepping. */ | |
2262 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2263 | &ecs-> | |
2264 | stepping_through_solib_catchpoints); | |
2265 | ecs->stepping_through_solib_after_catch = 1; | |
2266 | ||
2267 | /* Be sure to lift all breakpoints, so the inferior does | |
2268 | actually step past this point... */ | |
2269 | ecs->another_trap = 1; | |
2270 | break; | |
c906108c | 2271 | } |
c5aa993b | 2272 | else |
c5aa993b | 2273 | { |
488f131b | 2274 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2275 | ecs->another_trap = 1; |
488f131b | 2276 | break; |
c5aa993b | 2277 | } |
488f131b JB |
2278 | } |
2279 | #endif | |
2280 | break; | |
c906108c | 2281 | |
488f131b JB |
2282 | case BPSTAT_WHAT_LAST: |
2283 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2284 | |
488f131b JB |
2285 | case BPSTAT_WHAT_KEEP_CHECKING: |
2286 | break; | |
2287 | } | |
2288 | } | |
c906108c | 2289 | |
488f131b JB |
2290 | /* We come here if we hit a breakpoint but should not |
2291 | stop for it. Possibly we also were stepping | |
2292 | and should stop for that. So fall through and | |
2293 | test for stepping. But, if not stepping, | |
2294 | do not stop. */ | |
c906108c | 2295 | |
488f131b JB |
2296 | /* Are we stepping to get the inferior out of the dynamic |
2297 | linker's hook (and possibly the dld itself) after catching | |
2298 | a shlib event? */ | |
2299 | if (ecs->stepping_through_solib_after_catch) | |
2300 | { | |
2301 | #if defined(SOLIB_ADD) | |
2302 | /* Have we reached our destination? If not, keep going. */ | |
2303 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2304 | { | |
527159b7 RC |
2305 | if (debug_infrun) |
2306 | printf_unfiltered ("infrun: stepping in dynamic linker\n"); | |
488f131b JB |
2307 | ecs->another_trap = 1; |
2308 | keep_going (ecs); | |
104c1213 | 2309 | return; |
488f131b JB |
2310 | } |
2311 | #endif | |
527159b7 RC |
2312 | if (debug_infrun) |
2313 | printf_unfiltered ("infrun: step past dynamic linker\n"); | |
488f131b JB |
2314 | /* Else, stop and report the catchpoint(s) whose triggering |
2315 | caused us to begin stepping. */ | |
2316 | ecs->stepping_through_solib_after_catch = 0; | |
2317 | bpstat_clear (&stop_bpstat); | |
2318 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2319 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2320 | stop_print_frame = 1; | |
2321 | stop_stepping (ecs); | |
2322 | return; | |
2323 | } | |
c906108c | 2324 | |
488f131b JB |
2325 | if (step_resume_breakpoint) |
2326 | { | |
527159b7 RC |
2327 | if (debug_infrun) |
2328 | printf_unfiltered ("infrun: step-resume breakpoint\n"); | |
2329 | ||
488f131b JB |
2330 | /* Having a step-resume breakpoint overrides anything |
2331 | else having to do with stepping commands until | |
2332 | that breakpoint is reached. */ | |
488f131b JB |
2333 | keep_going (ecs); |
2334 | return; | |
2335 | } | |
c5aa993b | 2336 | |
488f131b JB |
2337 | if (step_range_end == 0) |
2338 | { | |
527159b7 RC |
2339 | if (debug_infrun) |
2340 | printf_unfiltered ("infrun: no stepping, continue\n"); | |
488f131b | 2341 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
2342 | keep_going (ecs); |
2343 | return; | |
2344 | } | |
c5aa993b | 2345 | |
488f131b | 2346 | /* If stepping through a line, keep going if still within it. |
c906108c | 2347 | |
488f131b JB |
2348 | Note that step_range_end is the address of the first instruction |
2349 | beyond the step range, and NOT the address of the last instruction | |
2350 | within it! */ | |
2351 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2352 | { | |
527159b7 RC |
2353 | if (debug_infrun) |
2354 | printf_unfiltered ("infrun: stepping inside range [0x%s-0x%s]\n", | |
2355 | paddr_nz (step_range_start), | |
2356 | paddr_nz (step_range_end)); | |
488f131b JB |
2357 | keep_going (ecs); |
2358 | return; | |
2359 | } | |
c5aa993b | 2360 | |
488f131b | 2361 | /* We stepped out of the stepping range. */ |
c906108c | 2362 | |
488f131b JB |
2363 | /* If we are stepping at the source level and entered the runtime |
2364 | loader dynamic symbol resolution code, we keep on single stepping | |
2365 | until we exit the run time loader code and reach the callee's | |
2366 | address. */ | |
2367 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2368 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2369 | { | |
4c8c40e6 MK |
2370 | CORE_ADDR pc_after_resolver = |
2371 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2372 | |
527159b7 RC |
2373 | if (debug_infrun) |
2374 | printf_unfiltered ("infrun: stepped into dynsym resolve code\n"); | |
2375 | ||
488f131b JB |
2376 | if (pc_after_resolver) |
2377 | { | |
2378 | /* Set up a step-resume breakpoint at the address | |
2379 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2380 | struct symtab_and_line sr_sal; | |
fe39c653 | 2381 | init_sal (&sr_sal); |
488f131b JB |
2382 | sr_sal.pc = pc_after_resolver; |
2383 | ||
44cbf7b5 | 2384 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c5aa993b | 2385 | } |
c906108c | 2386 | |
488f131b JB |
2387 | keep_going (ecs); |
2388 | return; | |
2389 | } | |
c906108c | 2390 | |
42edda50 AC |
2391 | if (step_range_end != 1 |
2392 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2393 | || step_over_calls == STEP_OVER_ALL) | |
2394 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 2395 | { |
527159b7 RC |
2396 | if (debug_infrun) |
2397 | printf_unfiltered ("infrun: stepped into signal trampoline\n"); | |
42edda50 | 2398 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
2399 | a signal trampoline (either by a signal being delivered or by |
2400 | the signal handler returning). Just single-step until the | |
2401 | inferior leaves the trampoline (either by calling the handler | |
2402 | or returning). */ | |
488f131b JB |
2403 | keep_going (ecs); |
2404 | return; | |
2405 | } | |
c906108c | 2406 | |
8fb3e588 | 2407 | if (frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) |
488f131b JB |
2408 | { |
2409 | /* It's a subroutine call. */ | |
95918acb | 2410 | CORE_ADDR real_stop_pc; |
8fb3e588 | 2411 | |
527159b7 RC |
2412 | if (debug_infrun) |
2413 | printf_unfiltered ("infrun: stepped into subroutine\n"); | |
2414 | ||
95918acb AC |
2415 | if ((step_over_calls == STEP_OVER_NONE) |
2416 | || ((step_range_end == 1) | |
2417 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2418 | { | |
2419 | /* I presume that step_over_calls is only 0 when we're | |
2420 | supposed to be stepping at the assembly language level | |
2421 | ("stepi"). Just stop. */ | |
2422 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
2423 | thought it was a subroutine call but it was not. Stop as | |
2424 | well. FENN */ | |
2425 | stop_step = 1; | |
2426 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2427 | stop_stepping (ecs); | |
2428 | return; | |
2429 | } | |
8fb3e588 | 2430 | |
8567c30f AC |
2431 | if (step_over_calls == STEP_OVER_ALL) |
2432 | { | |
2433 | /* We're doing a "next", set a breakpoint at callee's return | |
2434 | address (the address at which the caller will | |
2435 | resume). */ | |
44cbf7b5 | 2436 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
8567c30f AC |
2437 | keep_going (ecs); |
2438 | return; | |
2439 | } | |
a53c66de | 2440 | |
95918acb | 2441 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
2442 | calling routine and the real function), locate the real |
2443 | function. That's what tells us (a) whether we want to step | |
2444 | into it at all, and (b) what prologue we want to run to the | |
2445 | end of, if we do step into it. */ | |
95918acb AC |
2446 | real_stop_pc = skip_language_trampoline (stop_pc); |
2447 | if (real_stop_pc == 0) | |
2448 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2449 | if (real_stop_pc != 0) | |
2450 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 2451 | |
1b2bfbb9 RC |
2452 | if (IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start)) |
2453 | { | |
2454 | struct symtab_and_line sr_sal; | |
2455 | init_sal (&sr_sal); | |
2456 | sr_sal.pc = ecs->stop_func_start; | |
2457 | ||
44cbf7b5 | 2458 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
8fb3e588 AC |
2459 | keep_going (ecs); |
2460 | return; | |
1b2bfbb9 RC |
2461 | } |
2462 | ||
95918acb | 2463 | /* If we have line number information for the function we are |
8fb3e588 | 2464 | thinking of stepping into, step into it. |
95918acb | 2465 | |
8fb3e588 AC |
2466 | If there are several symtabs at that PC (e.g. with include |
2467 | files), just want to know whether *any* of them have line | |
2468 | numbers. find_pc_line handles this. */ | |
95918acb AC |
2469 | { |
2470 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 2471 | |
95918acb AC |
2472 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2473 | if (tmp_sal.line != 0) | |
2474 | { | |
2475 | step_into_function (ecs); | |
2476 | return; | |
2477 | } | |
2478 | } | |
2479 | ||
2480 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
2481 | set, we stop the step so that the user has a chance to switch |
2482 | in assembly mode. */ | |
95918acb AC |
2483 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
2484 | { | |
2485 | stop_step = 1; | |
2486 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2487 | stop_stepping (ecs); | |
2488 | return; | |
2489 | } | |
2490 | ||
2491 | /* Set a breakpoint at callee's return address (the address at | |
8fb3e588 | 2492 | which the caller will resume). */ |
44cbf7b5 | 2493 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
95918acb | 2494 | keep_going (ecs); |
488f131b | 2495 | return; |
488f131b | 2496 | } |
c906108c | 2497 | |
488f131b JB |
2498 | /* If we're in the return path from a shared library trampoline, |
2499 | we want to proceed through the trampoline when stepping. */ | |
2500 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2501 | { | |
488f131b | 2502 | /* Determine where this trampoline returns. */ |
5cf4d23a | 2503 | CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
c906108c | 2504 | |
527159b7 RC |
2505 | if (debug_infrun) |
2506 | printf_unfiltered ("infrun: stepped into solib return tramp\n"); | |
2507 | ||
488f131b | 2508 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2509 | if (real_stop_pc) |
488f131b JB |
2510 | { |
2511 | /* And put the step-breakpoint there and go until there. */ | |
2512 | struct symtab_and_line sr_sal; | |
2513 | ||
fe39c653 | 2514 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2515 | sr_sal.pc = real_stop_pc; |
488f131b | 2516 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
44cbf7b5 AC |
2517 | |
2518 | /* Do not specify what the fp should be when we stop since | |
2519 | on some machines the prologue is where the new fp value | |
2520 | is established. */ | |
2521 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
c906108c | 2522 | |
488f131b JB |
2523 | /* Restart without fiddling with the step ranges or |
2524 | other state. */ | |
2525 | keep_going (ecs); | |
2526 | return; | |
2527 | } | |
2528 | } | |
c906108c | 2529 | |
1b2bfbb9 RC |
2530 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
2531 | the trampoline processing logic, however, there are some trampolines | |
2532 | that have no names, so we should do trampoline handling first. */ | |
2533 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2534 | && ecs->stop_func_name == NULL) | |
2535 | { | |
527159b7 RC |
2536 | if (debug_infrun) |
2537 | printf_unfiltered ("infrun: stepped into undebuggable function\n"); | |
2538 | ||
1b2bfbb9 RC |
2539 | /* The inferior just stepped into, or returned to, an |
2540 | undebuggable function (where there is no symbol, not even a | |
2541 | minimal symbol, corresponding to the address where the | |
2542 | inferior stopped). Since we want to skip this kind of code, | |
2543 | we keep going until the inferior returns from this | |
2544 | function. */ | |
2545 | if (step_stop_if_no_debug) | |
2546 | { | |
2547 | /* If we have no line number and the step-stop-if-no-debug | |
2548 | is set, we stop the step so that the user has a chance to | |
2549 | switch in assembly mode. */ | |
2550 | stop_step = 1; | |
2551 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2552 | stop_stepping (ecs); | |
2553 | return; | |
2554 | } | |
2555 | else | |
2556 | { | |
2557 | /* Set a breakpoint at callee's return address (the address | |
2558 | at which the caller will resume). */ | |
44cbf7b5 | 2559 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
1b2bfbb9 RC |
2560 | keep_going (ecs); |
2561 | return; | |
2562 | } | |
2563 | } | |
2564 | ||
2565 | if (step_range_end == 1) | |
2566 | { | |
2567 | /* It is stepi or nexti. We always want to stop stepping after | |
2568 | one instruction. */ | |
527159b7 RC |
2569 | if (debug_infrun) |
2570 | printf_unfiltered ("infrun: stepi/nexti\n"); | |
1b2bfbb9 RC |
2571 | stop_step = 1; |
2572 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2573 | stop_stepping (ecs); | |
2574 | return; | |
2575 | } | |
2576 | ||
2577 | ecs->sal = find_pc_line (stop_pc, 0); | |
2578 | ||
488f131b JB |
2579 | if (ecs->sal.line == 0) |
2580 | { | |
2581 | /* We have no line number information. That means to stop | |
2582 | stepping (does this always happen right after one instruction, | |
2583 | when we do "s" in a function with no line numbers, | |
2584 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 RC |
2585 | if (debug_infrun) |
2586 | printf_unfiltered ("infrun: no line number info\n"); | |
488f131b JB |
2587 | stop_step = 1; |
2588 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2589 | stop_stepping (ecs); | |
2590 | return; | |
2591 | } | |
c906108c | 2592 | |
488f131b JB |
2593 | if ((stop_pc == ecs->sal.pc) |
2594 | && (ecs->current_line != ecs->sal.line | |
2595 | || ecs->current_symtab != ecs->sal.symtab)) | |
2596 | { | |
2597 | /* We are at the start of a different line. So stop. Note that | |
2598 | we don't stop if we step into the middle of a different line. | |
2599 | That is said to make things like for (;;) statements work | |
2600 | better. */ | |
527159b7 RC |
2601 | if (debug_infrun) |
2602 | printf_unfiltered ("infrun: stepped to a different line\n"); | |
488f131b JB |
2603 | stop_step = 1; |
2604 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2605 | stop_stepping (ecs); | |
2606 | return; | |
2607 | } | |
c906108c | 2608 | |
488f131b | 2609 | /* We aren't done stepping. |
c906108c | 2610 | |
488f131b JB |
2611 | Optimize by setting the stepping range to the line. |
2612 | (We might not be in the original line, but if we entered a | |
2613 | new line in mid-statement, we continue stepping. This makes | |
2614 | things like for(;;) statements work better.) */ | |
c906108c | 2615 | |
488f131b | 2616 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2617 | { |
488f131b JB |
2618 | /* If this is the last line of the function, don't keep stepping |
2619 | (it would probably step us out of the function). | |
2620 | This is particularly necessary for a one-line function, | |
2621 | in which after skipping the prologue we better stop even though | |
2622 | we will be in mid-line. */ | |
527159b7 RC |
2623 | if (debug_infrun) |
2624 | printf_unfiltered ("infrun: stepped to a different function\n"); | |
488f131b JB |
2625 | stop_step = 1; |
2626 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2627 | stop_stepping (ecs); | |
2628 | return; | |
c5aa993b | 2629 | } |
488f131b JB |
2630 | step_range_start = ecs->sal.pc; |
2631 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2632 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2633 | ecs->current_line = ecs->sal.line; |
2634 | ecs->current_symtab = ecs->sal.symtab; | |
2635 | ||
aa0cd9c1 AC |
2636 | /* In the case where we just stepped out of a function into the |
2637 | middle of a line of the caller, continue stepping, but | |
2638 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2639 | #if 0 |
2640 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2641 | generous. It will trigger on things like a step into a frameless | |
2642 | stackless leaf function. I think the logic should instead look | |
2643 | at the unwound frame ID has that should give a more robust | |
2644 | indication of what happened. */ | |
8fb3e588 AC |
2645 | if (step - ID == current - ID) |
2646 | still stepping in same function; | |
2647 | else if (step - ID == unwind (current - ID)) | |
2648 | stepped into a function; | |
2649 | else | |
2650 | stepped out of a function; | |
2651 | /* Of course this assumes that the frame ID unwind code is robust | |
2652 | and we're willing to introduce frame unwind logic into this | |
2653 | function. Fortunately, those days are nearly upon us. */ | |
65815ea1 | 2654 | #endif |
488f131b | 2655 | { |
aa0cd9c1 AC |
2656 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2657 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2658 | step_frame_id = current_frame; | |
488f131b | 2659 | } |
c906108c | 2660 | |
527159b7 RC |
2661 | if (debug_infrun) |
2662 | printf_unfiltered ("infrun: keep going\n"); | |
488f131b | 2663 | keep_going (ecs); |
104c1213 JM |
2664 | } |
2665 | ||
2666 | /* Are we in the middle of stepping? */ | |
2667 | ||
2668 | static int | |
2669 | currently_stepping (struct execution_control_state *ecs) | |
2670 | { | |
d303a6c7 | 2671 | return ((!ecs->handling_longjmp |
104c1213 JM |
2672 | && ((step_range_end && step_resume_breakpoint == NULL) |
2673 | || trap_expected)) | |
2674 | || ecs->stepping_through_solib_after_catch | |
2675 | || bpstat_should_step ()); | |
2676 | } | |
c906108c | 2677 | |
c2c6d25f JM |
2678 | /* Subroutine call with source code we should not step over. Do step |
2679 | to the first line of code in it. */ | |
2680 | ||
2681 | static void | |
2682 | step_into_function (struct execution_control_state *ecs) | |
2683 | { | |
2684 | struct symtab *s; | |
2685 | struct symtab_and_line sr_sal; | |
2686 | ||
2687 | s = find_pc_symtab (stop_pc); | |
2688 | if (s && s->language != language_asm) | |
2689 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2690 | ||
2691 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2692 | /* Use the step_resume_break to step until the end of the prologue, | |
2693 | even if that involves jumps (as it seems to on the vax under | |
2694 | 4.2). */ | |
2695 | /* If the prologue ends in the middle of a source line, continue to | |
2696 | the end of that source line (if it is still within the function). | |
2697 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2698 | if (ecs->sal.end |
2699 | && ecs->sal.pc != ecs->stop_func_start | |
2700 | && ecs->sal.end < ecs->stop_func_end) | |
2701 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2702 | |
2dbd5e30 KB |
2703 | /* Architectures which require breakpoint adjustment might not be able |
2704 | to place a breakpoint at the computed address. If so, the test | |
2705 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2706 | ecs->stop_func_start to an address at which a breakpoint may be | |
2707 | legitimately placed. | |
8fb3e588 | 2708 | |
2dbd5e30 KB |
2709 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
2710 | made, GDB will enter an infinite loop when stepping through | |
2711 | optimized code consisting of VLIW instructions which contain | |
2712 | subinstructions corresponding to different source lines. On | |
2713 | FR-V, it's not permitted to place a breakpoint on any but the | |
2714 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2715 | set, GDB will adjust the breakpoint address to the beginning of | |
2716 | the VLIW instruction. Thus, we need to make the corresponding | |
2717 | adjustment here when computing the stop address. */ | |
8fb3e588 | 2718 | |
2dbd5e30 KB |
2719 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
2720 | { | |
2721 | ecs->stop_func_start | |
2722 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
8fb3e588 | 2723 | ecs->stop_func_start); |
2dbd5e30 KB |
2724 | } |
2725 | ||
c2c6d25f JM |
2726 | if (ecs->stop_func_start == stop_pc) |
2727 | { | |
2728 | /* We are already there: stop now. */ | |
2729 | stop_step = 1; | |
488f131b | 2730 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2731 | stop_stepping (ecs); |
2732 | return; | |
2733 | } | |
2734 | else | |
2735 | { | |
2736 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2737 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2738 | sr_sal.pc = ecs->stop_func_start; |
2739 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
44cbf7b5 | 2740 | |
c2c6d25f | 2741 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
2742 | some machines the prologue is where the new fp value is |
2743 | established. */ | |
44cbf7b5 | 2744 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c2c6d25f JM |
2745 | |
2746 | /* And make sure stepping stops right away then. */ | |
2747 | step_range_end = step_range_start; | |
2748 | } | |
2749 | keep_going (ecs); | |
2750 | } | |
d4f3574e | 2751 | |
44cbf7b5 AC |
2752 | /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID. |
2753 | This is used to both functions and to skip over code. */ | |
2754 | ||
2755 | static void | |
2756 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
2757 | struct frame_id sr_id) | |
2758 | { | |
2759 | /* There should never be more than one step-resume breakpoint per | |
2760 | thread, so we should never be setting a new | |
2761 | step_resume_breakpoint when one is already active. */ | |
2762 | gdb_assert (step_resume_breakpoint == NULL); | |
2763 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, | |
2764 | bp_step_resume); | |
2765 | if (breakpoints_inserted) | |
2766 | insert_breakpoints (); | |
2767 | } | |
2768 | ||
7ce450bd AC |
2769 | /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used |
2770 | to skip a function (next, skip-no-debug) or signal. It's assumed | |
2771 | that the function/signal handler being skipped eventually returns | |
2772 | to the breakpoint inserted at RETURN_FRAME.pc. | |
2773 | ||
2774 | For the skip-function case, the function may have been reached by | |
2775 | either single stepping a call / return / signal-return instruction, | |
2776 | or by hitting a breakpoint. In all cases, the RETURN_FRAME belongs | |
2777 | to the skip-function's caller. | |
2778 | ||
2779 | For the signals case, this is called with the interrupted | |
2780 | function's frame. The signal handler, when it returns, will resume | |
2781 | the interrupted function at RETURN_FRAME.pc. */ | |
d303a6c7 AC |
2782 | |
2783 | static void | |
44cbf7b5 | 2784 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
2785 | { |
2786 | struct symtab_and_line sr_sal; | |
2787 | ||
d303a6c7 AC |
2788 | init_sal (&sr_sal); /* initialize to zeros */ |
2789 | ||
7ce450bd | 2790 | sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (return_frame)); |
d303a6c7 AC |
2791 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2792 | ||
44cbf7b5 | 2793 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
d303a6c7 AC |
2794 | } |
2795 | ||
104c1213 JM |
2796 | static void |
2797 | stop_stepping (struct execution_control_state *ecs) | |
2798 | { | |
527159b7 RC |
2799 | if (debug_infrun) |
2800 | printf_unfiltered ("infrun: stop_stepping\n"); | |
2801 | ||
cd0fc7c3 SS |
2802 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2803 | ecs->wait_some_more = 0; | |
2804 | } | |
2805 | ||
d4f3574e SS |
2806 | /* This function handles various cases where we need to continue |
2807 | waiting for the inferior. */ | |
2808 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2809 | ||
2810 | static void | |
2811 | keep_going (struct execution_control_state *ecs) | |
2812 | { | |
d4f3574e | 2813 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2814 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 2815 | |
d4f3574e SS |
2816 | /* If we did not do break;, it means we should keep running the |
2817 | inferior and not return to debugger. */ | |
2818 | ||
2819 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2820 | { | |
2821 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2822 | the inferior, else we'd have done a break above) and we |
2823 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2824 | resume (currently_stepping (ecs), stop_signal); |
2825 | } | |
2826 | else | |
2827 | { | |
2828 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2829 | anyway (the user asked that this signal be passed to the |
2830 | child) | |
2831 | -- or -- | |
2832 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2833 | decided we should resume from it. | |
d4f3574e | 2834 | |
68f53502 | 2835 | We're going to run this baby now! */ |
d4f3574e | 2836 | |
68f53502 | 2837 | if (!breakpoints_inserted && !ecs->another_trap) |
d4f3574e SS |
2838 | { |
2839 | breakpoints_failed = insert_breakpoints (); | |
2840 | if (breakpoints_failed) | |
2841 | { | |
2842 | stop_stepping (ecs); | |
2843 | return; | |
2844 | } | |
2845 | breakpoints_inserted = 1; | |
2846 | } | |
2847 | ||
2848 | trap_expected = ecs->another_trap; | |
2849 | ||
2850 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2851 | specifies that such a signal should be delivered to the |
2852 | target program). | |
2853 | ||
2854 | Typically, this would occure when a user is debugging a | |
2855 | target monitor on a simulator: the target monitor sets a | |
2856 | breakpoint; the simulator encounters this break-point and | |
2857 | halts the simulation handing control to GDB; GDB, noteing | |
2858 | that the break-point isn't valid, returns control back to the | |
2859 | simulator; the simulator then delivers the hardware | |
2860 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2861 | ||
2862 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2863 | stop_signal = TARGET_SIGNAL_0; |
2864 | ||
d4f3574e SS |
2865 | |
2866 | resume (currently_stepping (ecs), stop_signal); | |
2867 | } | |
2868 | ||
488f131b | 2869 | prepare_to_wait (ecs); |
d4f3574e SS |
2870 | } |
2871 | ||
104c1213 JM |
2872 | /* This function normally comes after a resume, before |
2873 | handle_inferior_event exits. It takes care of any last bits of | |
2874 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2875 | |
104c1213 JM |
2876 | static void |
2877 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2878 | { |
527159b7 RC |
2879 | if (debug_infrun) |
2880 | printf_unfiltered ("infrun: prepare_to_wait\n"); | |
104c1213 JM |
2881 | if (ecs->infwait_state == infwait_normal_state) |
2882 | { | |
2883 | overlay_cache_invalid = 1; | |
2884 | ||
2885 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2886 | target_wait because they can be loaded from the target while |
2887 | in target_wait. This makes remote debugging a bit more | |
2888 | efficient for those targets that provide critical registers | |
2889 | as part of their normal status mechanism. */ | |
104c1213 JM |
2890 | |
2891 | registers_changed (); | |
39f77062 | 2892 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2893 | ecs->wp = &(ecs->ws); |
2894 | } | |
2895 | /* This is the old end of the while loop. Let everybody know we | |
2896 | want to wait for the inferior some more and get called again | |
2897 | soon. */ | |
2898 | ecs->wait_some_more = 1; | |
c906108c | 2899 | } |
11cf8741 JM |
2900 | |
2901 | /* Print why the inferior has stopped. We always print something when | |
2902 | the inferior exits, or receives a signal. The rest of the cases are | |
2903 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2904 | there should be a call to this function from handle_inferior_event() | |
2905 | each time stop_stepping() is called.*/ | |
2906 | static void | |
2907 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2908 | { | |
2909 | switch (stop_reason) | |
2910 | { | |
2911 | case STOP_UNKNOWN: | |
2912 | /* We don't deal with these cases from handle_inferior_event() | |
2913 | yet. */ | |
2914 | break; | |
2915 | case END_STEPPING_RANGE: | |
2916 | /* We are done with a step/next/si/ni command. */ | |
2917 | /* For now print nothing. */ | |
fb40c209 | 2918 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2919 | operation for n > 1 */ |
fb40c209 | 2920 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2921 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2922 | ui_out_field_string (uiout, "reason", "end-stepping-range"); |
11cf8741 JM |
2923 | break; |
2924 | case BREAKPOINT_HIT: | |
2925 | /* We found a breakpoint. */ | |
2926 | /* For now print nothing. */ | |
2927 | break; | |
2928 | case SIGNAL_EXITED: | |
2929 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2930 | annotate_signalled (); |
9dc5e2a9 | 2931 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2932 | ui_out_field_string (uiout, "reason", "exited-signalled"); |
8b93c638 JM |
2933 | ui_out_text (uiout, "\nProgram terminated with signal "); |
2934 | annotate_signal_name (); | |
488f131b JB |
2935 | ui_out_field_string (uiout, "signal-name", |
2936 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2937 | annotate_signal_name_end (); |
2938 | ui_out_text (uiout, ", "); | |
2939 | annotate_signal_string (); | |
488f131b JB |
2940 | ui_out_field_string (uiout, "signal-meaning", |
2941 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2942 | annotate_signal_string_end (); |
2943 | ui_out_text (uiout, ".\n"); | |
2944 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
2945 | break; |
2946 | case EXITED: | |
2947 | /* The inferior program is finished. */ | |
8b93c638 JM |
2948 | annotate_exited (stop_info); |
2949 | if (stop_info) | |
2950 | { | |
9dc5e2a9 | 2951 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2952 | ui_out_field_string (uiout, "reason", "exited"); |
8b93c638 | 2953 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
2954 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
2955 | (unsigned int) stop_info); | |
8b93c638 JM |
2956 | ui_out_text (uiout, ".\n"); |
2957 | } | |
2958 | else | |
2959 | { | |
9dc5e2a9 | 2960 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2961 | ui_out_field_string (uiout, "reason", "exited-normally"); |
8b93c638 JM |
2962 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
2963 | } | |
11cf8741 JM |
2964 | break; |
2965 | case SIGNAL_RECEIVED: | |
2966 | /* Signal received. The signal table tells us to print about | |
2967 | it. */ | |
8b93c638 JM |
2968 | annotate_signal (); |
2969 | ui_out_text (uiout, "\nProgram received signal "); | |
2970 | annotate_signal_name (); | |
84c6c83c KS |
2971 | if (ui_out_is_mi_like_p (uiout)) |
2972 | ui_out_field_string (uiout, "reason", "signal-received"); | |
488f131b JB |
2973 | ui_out_field_string (uiout, "signal-name", |
2974 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2975 | annotate_signal_name_end (); |
2976 | ui_out_text (uiout, ", "); | |
2977 | annotate_signal_string (); | |
488f131b JB |
2978 | ui_out_field_string (uiout, "signal-meaning", |
2979 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2980 | annotate_signal_string_end (); |
2981 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
2982 | break; |
2983 | default: | |
8e65ff28 AC |
2984 | internal_error (__FILE__, __LINE__, |
2985 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
2986 | break; |
2987 | } | |
2988 | } | |
c906108c | 2989 | \f |
43ff13b4 | 2990 | |
c906108c SS |
2991 | /* Here to return control to GDB when the inferior stops for real. |
2992 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
2993 | ||
2994 | STOP_PRINT_FRAME nonzero means print the executing frame | |
2995 | (pc, function, args, file, line number and line text). | |
2996 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
2997 | attempting to insert breakpoints. */ | |
2998 | ||
2999 | void | |
96baa820 | 3000 | normal_stop (void) |
c906108c | 3001 | { |
73b65bb0 DJ |
3002 | struct target_waitstatus last; |
3003 | ptid_t last_ptid; | |
3004 | ||
3005 | get_last_target_status (&last_ptid, &last); | |
3006 | ||
c906108c SS |
3007 | /* As with the notification of thread events, we want to delay |
3008 | notifying the user that we've switched thread context until | |
3009 | the inferior actually stops. | |
3010 | ||
73b65bb0 DJ |
3011 | There's no point in saying anything if the inferior has exited. |
3012 | Note that SIGNALLED here means "exited with a signal", not | |
3013 | "received a signal". */ | |
488f131b | 3014 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
3015 | && target_has_execution |
3016 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
3017 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
3018 | { |
3019 | target_terminal_ours_for_output (); | |
c3f6f71d | 3020 | printf_filtered ("[Switching to %s]\n", |
39f77062 KB |
3021 | target_pid_or_tid_to_str (inferior_ptid)); |
3022 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 3023 | } |
c906108c | 3024 | |
4fa8626c | 3025 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
3026 | /* Make sure that the current_frame's pc is correct. This |
3027 | is a correction for setting up the frame info before doing | |
3028 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
3029 | if (target_has_execution) |
3030 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
3031 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
3032 | frame code to check for this and sort out any resultant mess. | |
3033 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 3034 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 3035 | |
c906108c SS |
3036 | if (target_has_execution && breakpoints_inserted) |
3037 | { | |
3038 | if (remove_breakpoints ()) | |
3039 | { | |
3040 | target_terminal_ours_for_output (); | |
3041 | printf_filtered ("Cannot remove breakpoints because "); | |
3042 | printf_filtered ("program is no longer writable.\n"); | |
3043 | printf_filtered ("It might be running in another process.\n"); | |
3044 | printf_filtered ("Further execution is probably impossible.\n"); | |
3045 | } | |
3046 | } | |
3047 | breakpoints_inserted = 0; | |
3048 | ||
3049 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3050 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3051 | ||
3052 | breakpoint_auto_delete (stop_bpstat); | |
3053 | ||
3054 | /* If an auto-display called a function and that got a signal, | |
3055 | delete that auto-display to avoid an infinite recursion. */ | |
3056 | ||
3057 | if (stopped_by_random_signal) | |
3058 | disable_current_display (); | |
3059 | ||
3060 | /* Don't print a message if in the middle of doing a "step n" | |
3061 | operation for n > 1 */ | |
3062 | if (step_multi && stop_step) | |
3063 | goto done; | |
3064 | ||
3065 | target_terminal_ours (); | |
3066 | ||
5913bcb0 AC |
3067 | /* Look up the hook_stop and run it (CLI internally handles problem |
3068 | of stop_command's pre-hook not existing). */ | |
3069 | if (stop_command) | |
3070 | catch_errors (hook_stop_stub, stop_command, | |
3071 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3072 | |
3073 | if (!target_has_stack) | |
3074 | { | |
3075 | ||
3076 | goto done; | |
3077 | } | |
3078 | ||
3079 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3080 | and current location is based on that. | |
3081 | Don't do this on return from a stack dummy routine, | |
3082 | or if the program has exited. */ | |
3083 | ||
3084 | if (!stop_stack_dummy) | |
3085 | { | |
0f7d239c | 3086 | select_frame (get_current_frame ()); |
c906108c SS |
3087 | |
3088 | /* Print current location without a level number, if | |
c5aa993b JM |
3089 | we have changed functions or hit a breakpoint. |
3090 | Print source line if we have one. | |
3091 | bpstat_print() contains the logic deciding in detail | |
3092 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3093 | |
6e7f8b9c | 3094 | if (stop_print_frame && deprecated_selected_frame) |
c906108c SS |
3095 | { |
3096 | int bpstat_ret; | |
3097 | int source_flag; | |
917317f4 | 3098 | int do_frame_printing = 1; |
c906108c SS |
3099 | |
3100 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3101 | switch (bpstat_ret) |
3102 | { | |
3103 | case PRINT_UNKNOWN: | |
aa0cd9c1 | 3104 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
3105 | (or should) carry around the function and does (or |
3106 | should) use that when doing a frame comparison. */ | |
917317f4 | 3107 | if (stop_step |
aa0cd9c1 AC |
3108 | && frame_id_eq (step_frame_id, |
3109 | get_frame_id (get_current_frame ())) | |
917317f4 | 3110 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3111 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3112 | else |
488f131b | 3113 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3114 | break; |
3115 | case PRINT_SRC_AND_LOC: | |
488f131b | 3116 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3117 | break; |
3118 | case PRINT_SRC_ONLY: | |
c5394b80 | 3119 | source_flag = SRC_LINE; |
917317f4 JM |
3120 | break; |
3121 | case PRINT_NOTHING: | |
488f131b | 3122 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3123 | do_frame_printing = 0; |
3124 | break; | |
3125 | default: | |
488f131b | 3126 | internal_error (__FILE__, __LINE__, "Unknown value."); |
917317f4 | 3127 | } |
fb40c209 | 3128 | /* For mi, have the same behavior every time we stop: |
488f131b | 3129 | print everything but the source line. */ |
9dc5e2a9 | 3130 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3131 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3132 | |
9dc5e2a9 | 3133 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3134 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3135 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3136 | /* The behavior of this routine with respect to the source |
3137 | flag is: | |
c5394b80 JM |
3138 | SRC_LINE: Print only source line |
3139 | LOCATION: Print only location | |
3140 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3141 | if (do_frame_printing) |
b04f3ab4 | 3142 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
3143 | |
3144 | /* Display the auto-display expressions. */ | |
3145 | do_displays (); | |
3146 | } | |
3147 | } | |
3148 | ||
3149 | /* Save the function value return registers, if we care. | |
3150 | We might be about to restore their previous contents. */ | |
3151 | if (proceed_to_finish) | |
72cec141 AC |
3152 | /* NB: The copy goes through to the target picking up the value of |
3153 | all the registers. */ | |
3154 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3155 | |
3156 | if (stop_stack_dummy) | |
3157 | { | |
dbe9fe58 AC |
3158 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3159 | ends with a setting of the current frame, so we can use that | |
3160 | next. */ | |
3161 | frame_pop (get_current_frame ()); | |
c906108c | 3162 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3163 | Can't rely on restore_inferior_status because that only gets |
3164 | called if we don't stop in the called function. */ | |
c906108c | 3165 | stop_pc = read_pc (); |
0f7d239c | 3166 | select_frame (get_current_frame ()); |
c906108c SS |
3167 | } |
3168 | ||
c906108c SS |
3169 | done: |
3170 | annotate_stopped (); | |
7a464420 | 3171 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3172 | } |
3173 | ||
3174 | static int | |
96baa820 | 3175 | hook_stop_stub (void *cmd) |
c906108c | 3176 | { |
5913bcb0 | 3177 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3178 | return (0); |
3179 | } | |
3180 | \f | |
c5aa993b | 3181 | int |
96baa820 | 3182 | signal_stop_state (int signo) |
c906108c SS |
3183 | { |
3184 | return signal_stop[signo]; | |
3185 | } | |
3186 | ||
c5aa993b | 3187 | int |
96baa820 | 3188 | signal_print_state (int signo) |
c906108c SS |
3189 | { |
3190 | return signal_print[signo]; | |
3191 | } | |
3192 | ||
c5aa993b | 3193 | int |
96baa820 | 3194 | signal_pass_state (int signo) |
c906108c SS |
3195 | { |
3196 | return signal_program[signo]; | |
3197 | } | |
3198 | ||
488f131b | 3199 | int |
7bda5e4a | 3200 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3201 | { |
3202 | int ret = signal_stop[signo]; | |
3203 | signal_stop[signo] = state; | |
3204 | return ret; | |
3205 | } | |
3206 | ||
488f131b | 3207 | int |
7bda5e4a | 3208 | signal_print_update (int signo, int state) |
d4f3574e SS |
3209 | { |
3210 | int ret = signal_print[signo]; | |
3211 | signal_print[signo] = state; | |
3212 | return ret; | |
3213 | } | |
3214 | ||
488f131b | 3215 | int |
7bda5e4a | 3216 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3217 | { |
3218 | int ret = signal_program[signo]; | |
3219 | signal_program[signo] = state; | |
3220 | return ret; | |
3221 | } | |
3222 | ||
c906108c | 3223 | static void |
96baa820 | 3224 | sig_print_header (void) |
c906108c SS |
3225 | { |
3226 | printf_filtered ("\ | |
3227 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3228 | } | |
3229 | ||
3230 | static void | |
96baa820 | 3231 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3232 | { |
3233 | char *name = target_signal_to_name (oursig); | |
3234 | int name_padding = 13 - strlen (name); | |
96baa820 | 3235 | |
c906108c SS |
3236 | if (name_padding <= 0) |
3237 | name_padding = 0; | |
3238 | ||
3239 | printf_filtered ("%s", name); | |
488f131b | 3240 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3241 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3242 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3243 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3244 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3245 | } | |
3246 | ||
3247 | /* Specify how various signals in the inferior should be handled. */ | |
3248 | ||
3249 | static void | |
96baa820 | 3250 | handle_command (char *args, int from_tty) |
c906108c SS |
3251 | { |
3252 | char **argv; | |
3253 | int digits, wordlen; | |
3254 | int sigfirst, signum, siglast; | |
3255 | enum target_signal oursig; | |
3256 | int allsigs; | |
3257 | int nsigs; | |
3258 | unsigned char *sigs; | |
3259 | struct cleanup *old_chain; | |
3260 | ||
3261 | if (args == NULL) | |
3262 | { | |
3263 | error_no_arg ("signal to handle"); | |
3264 | } | |
3265 | ||
3266 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3267 | ||
3268 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3269 | sigs = (unsigned char *) alloca (nsigs); | |
3270 | memset (sigs, 0, nsigs); | |
3271 | ||
3272 | /* Break the command line up into args. */ | |
3273 | ||
3274 | argv = buildargv (args); | |
3275 | if (argv == NULL) | |
3276 | { | |
3277 | nomem (0); | |
3278 | } | |
7a292a7a | 3279 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3280 | |
3281 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3282 | actions. Signal numbers and signal names may be interspersed with | |
3283 | actions, with the actions being performed for all signals cumulatively | |
3284 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3285 | ||
3286 | while (*argv != NULL) | |
3287 | { | |
3288 | wordlen = strlen (*argv); | |
3289 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3290 | {; | |
3291 | } | |
3292 | allsigs = 0; | |
3293 | sigfirst = siglast = -1; | |
3294 | ||
3295 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3296 | { | |
3297 | /* Apply action to all signals except those used by the | |
3298 | debugger. Silently skip those. */ | |
3299 | allsigs = 1; | |
3300 | sigfirst = 0; | |
3301 | siglast = nsigs - 1; | |
3302 | } | |
3303 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3304 | { | |
3305 | SET_SIGS (nsigs, sigs, signal_stop); | |
3306 | SET_SIGS (nsigs, sigs, signal_print); | |
3307 | } | |
3308 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3309 | { | |
3310 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3311 | } | |
3312 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3313 | { | |
3314 | SET_SIGS (nsigs, sigs, signal_print); | |
3315 | } | |
3316 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3317 | { | |
3318 | SET_SIGS (nsigs, sigs, signal_program); | |
3319 | } | |
3320 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3321 | { | |
3322 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3323 | } | |
3324 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3325 | { | |
3326 | SET_SIGS (nsigs, sigs, signal_program); | |
3327 | } | |
3328 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3329 | { | |
3330 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3331 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3332 | } | |
3333 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3334 | { | |
3335 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3336 | } | |
3337 | else if (digits > 0) | |
3338 | { | |
3339 | /* It is numeric. The numeric signal refers to our own | |
3340 | internal signal numbering from target.h, not to host/target | |
3341 | signal number. This is a feature; users really should be | |
3342 | using symbolic names anyway, and the common ones like | |
3343 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3344 | ||
3345 | sigfirst = siglast = (int) | |
3346 | target_signal_from_command (atoi (*argv)); | |
3347 | if ((*argv)[digits] == '-') | |
3348 | { | |
3349 | siglast = (int) | |
3350 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3351 | } | |
3352 | if (sigfirst > siglast) | |
3353 | { | |
3354 | /* Bet he didn't figure we'd think of this case... */ | |
3355 | signum = sigfirst; | |
3356 | sigfirst = siglast; | |
3357 | siglast = signum; | |
3358 | } | |
3359 | } | |
3360 | else | |
3361 | { | |
3362 | oursig = target_signal_from_name (*argv); | |
3363 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3364 | { | |
3365 | sigfirst = siglast = (int) oursig; | |
3366 | } | |
3367 | else | |
3368 | { | |
3369 | /* Not a number and not a recognized flag word => complain. */ | |
3370 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3371 | } | |
3372 | } | |
3373 | ||
3374 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3375 | which signals to apply actions to. */ |
c906108c SS |
3376 | |
3377 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3378 | { | |
3379 | switch ((enum target_signal) signum) | |
3380 | { | |
3381 | case TARGET_SIGNAL_TRAP: | |
3382 | case TARGET_SIGNAL_INT: | |
3383 | if (!allsigs && !sigs[signum]) | |
3384 | { | |
3385 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3386 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3387 | { |
3388 | sigs[signum] = 1; | |
3389 | } | |
3390 | else | |
3391 | { | |
3392 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3393 | gdb_flush (gdb_stdout); | |
3394 | } | |
3395 | } | |
3396 | break; | |
3397 | case TARGET_SIGNAL_0: | |
3398 | case TARGET_SIGNAL_DEFAULT: | |
3399 | case TARGET_SIGNAL_UNKNOWN: | |
3400 | /* Make sure that "all" doesn't print these. */ | |
3401 | break; | |
3402 | default: | |
3403 | sigs[signum] = 1; | |
3404 | break; | |
3405 | } | |
3406 | } | |
3407 | ||
3408 | argv++; | |
3409 | } | |
3410 | ||
39f77062 | 3411 | target_notice_signals (inferior_ptid); |
c906108c SS |
3412 | |
3413 | if (from_tty) | |
3414 | { | |
3415 | /* Show the results. */ | |
3416 | sig_print_header (); | |
3417 | for (signum = 0; signum < nsigs; signum++) | |
3418 | { | |
3419 | if (sigs[signum]) | |
3420 | { | |
3421 | sig_print_info (signum); | |
3422 | } | |
3423 | } | |
3424 | } | |
3425 | ||
3426 | do_cleanups (old_chain); | |
3427 | } | |
3428 | ||
3429 | static void | |
96baa820 | 3430 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3431 | { |
3432 | char **argv; | |
3433 | struct cleanup *old_chain; | |
3434 | ||
3435 | /* Break the command line up into args. */ | |
3436 | ||
3437 | argv = buildargv (args); | |
3438 | if (argv == NULL) | |
3439 | { | |
3440 | nomem (0); | |
3441 | } | |
7a292a7a | 3442 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3443 | if (argv[1] != (char *) NULL) |
3444 | { | |
3445 | char *argBuf; | |
3446 | int bufLen; | |
3447 | ||
3448 | bufLen = strlen (argv[0]) + 20; | |
3449 | argBuf = (char *) xmalloc (bufLen); | |
3450 | if (argBuf) | |
3451 | { | |
3452 | int validFlag = 1; | |
3453 | enum target_signal oursig; | |
3454 | ||
3455 | oursig = target_signal_from_name (argv[0]); | |
3456 | memset (argBuf, 0, bufLen); | |
3457 | if (strcmp (argv[1], "Q") == 0) | |
3458 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3459 | else | |
3460 | { | |
3461 | if (strcmp (argv[1], "s") == 0) | |
3462 | { | |
3463 | if (!signal_stop[oursig]) | |
3464 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3465 | else | |
3466 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3467 | } | |
3468 | else if (strcmp (argv[1], "i") == 0) | |
3469 | { | |
3470 | if (!signal_program[oursig]) | |
3471 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3472 | else | |
3473 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3474 | } | |
3475 | else if (strcmp (argv[1], "r") == 0) | |
3476 | { | |
3477 | if (!signal_print[oursig]) | |
3478 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3479 | else | |
3480 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3481 | } | |
3482 | else | |
3483 | validFlag = 0; | |
3484 | } | |
3485 | if (validFlag) | |
3486 | handle_command (argBuf, from_tty); | |
3487 | else | |
3488 | printf_filtered ("Invalid signal handling flag.\n"); | |
3489 | if (argBuf) | |
b8c9b27d | 3490 | xfree (argBuf); |
c906108c SS |
3491 | } |
3492 | } | |
3493 | do_cleanups (old_chain); | |
3494 | } | |
3495 | ||
3496 | /* Print current contents of the tables set by the handle command. | |
3497 | It is possible we should just be printing signals actually used | |
3498 | by the current target (but for things to work right when switching | |
3499 | targets, all signals should be in the signal tables). */ | |
3500 | ||
3501 | static void | |
96baa820 | 3502 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3503 | { |
3504 | enum target_signal oursig; | |
3505 | sig_print_header (); | |
3506 | ||
3507 | if (signum_exp) | |
3508 | { | |
3509 | /* First see if this is a symbol name. */ | |
3510 | oursig = target_signal_from_name (signum_exp); | |
3511 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3512 | { | |
3513 | /* No, try numeric. */ | |
3514 | oursig = | |
bb518678 | 3515 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3516 | } |
3517 | sig_print_info (oursig); | |
3518 | return; | |
3519 | } | |
3520 | ||
3521 | printf_filtered ("\n"); | |
3522 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3523 | for (oursig = TARGET_SIGNAL_FIRST; | |
3524 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3525 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3526 | { | |
3527 | QUIT; | |
3528 | ||
3529 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3530 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3531 | sig_print_info (oursig); |
3532 | } | |
3533 | ||
3534 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3535 | } | |
3536 | \f | |
7a292a7a SS |
3537 | struct inferior_status |
3538 | { | |
3539 | enum target_signal stop_signal; | |
3540 | CORE_ADDR stop_pc; | |
3541 | bpstat stop_bpstat; | |
3542 | int stop_step; | |
3543 | int stop_stack_dummy; | |
3544 | int stopped_by_random_signal; | |
3545 | int trap_expected; | |
3546 | CORE_ADDR step_range_start; | |
3547 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3548 | struct frame_id step_frame_id; |
5fbbeb29 | 3549 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3550 | CORE_ADDR step_resume_break_address; |
3551 | int stop_after_trap; | |
c0236d92 | 3552 | int stop_soon; |
72cec141 | 3553 | struct regcache *stop_registers; |
7a292a7a SS |
3554 | |
3555 | /* These are here because if call_function_by_hand has written some | |
3556 | registers and then decides to call error(), we better not have changed | |
3557 | any registers. */ | |
72cec141 | 3558 | struct regcache *registers; |
7a292a7a | 3559 | |
101dcfbe AC |
3560 | /* A frame unique identifier. */ |
3561 | struct frame_id selected_frame_id; | |
3562 | ||
7a292a7a SS |
3563 | int breakpoint_proceeded; |
3564 | int restore_stack_info; | |
3565 | int proceed_to_finish; | |
3566 | }; | |
3567 | ||
7a292a7a | 3568 | void |
96baa820 JM |
3569 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3570 | LONGEST val) | |
7a292a7a | 3571 | { |
3acba339 | 3572 | int size = register_size (current_gdbarch, regno); |
7a292a7a SS |
3573 | void *buf = alloca (size); |
3574 | store_signed_integer (buf, size, val); | |
0818c12a | 3575 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3576 | } |
3577 | ||
c906108c SS |
3578 | /* Save all of the information associated with the inferior<==>gdb |
3579 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3580 | (defined in inferior.h). */ | |
3581 | ||
7a292a7a | 3582 | struct inferior_status * |
96baa820 | 3583 | save_inferior_status (int restore_stack_info) |
c906108c | 3584 | { |
72cec141 | 3585 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3586 | |
c906108c SS |
3587 | inf_status->stop_signal = stop_signal; |
3588 | inf_status->stop_pc = stop_pc; | |
3589 | inf_status->stop_step = stop_step; | |
3590 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3591 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3592 | inf_status->trap_expected = trap_expected; | |
3593 | inf_status->step_range_start = step_range_start; | |
3594 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3595 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3596 | inf_status->step_over_calls = step_over_calls; |
3597 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3598 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3599 | /* Save original bpstat chain here; replace it with copy of chain. |
3600 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3601 | hand them back the original chain when restore_inferior_status is |
3602 | called. */ | |
c906108c SS |
3603 | inf_status->stop_bpstat = stop_bpstat; |
3604 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3605 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3606 | inf_status->restore_stack_info = restore_stack_info; | |
3607 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3608 | |
72cec141 | 3609 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3610 | |
72cec141 | 3611 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3612 | |
7a424e99 | 3613 | inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
7a292a7a | 3614 | return inf_status; |
c906108c SS |
3615 | } |
3616 | ||
c906108c | 3617 | static int |
96baa820 | 3618 | restore_selected_frame (void *args) |
c906108c | 3619 | { |
488f131b | 3620 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3621 | struct frame_info *frame; |
c906108c | 3622 | |
101dcfbe | 3623 | frame = frame_find_by_id (*fid); |
c906108c | 3624 | |
aa0cd9c1 AC |
3625 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3626 | selected frame. */ | |
101dcfbe | 3627 | if (frame == NULL) |
c906108c SS |
3628 | { |
3629 | warning ("Unable to restore previously selected frame.\n"); | |
3630 | return 0; | |
3631 | } | |
3632 | ||
0f7d239c | 3633 | select_frame (frame); |
c906108c SS |
3634 | |
3635 | return (1); | |
3636 | } | |
3637 | ||
3638 | void | |
96baa820 | 3639 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3640 | { |
3641 | stop_signal = inf_status->stop_signal; | |
3642 | stop_pc = inf_status->stop_pc; | |
3643 | stop_step = inf_status->stop_step; | |
3644 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3645 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3646 | trap_expected = inf_status->trap_expected; | |
3647 | step_range_start = inf_status->step_range_start; | |
3648 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3649 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3650 | step_over_calls = inf_status->step_over_calls; |
3651 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3652 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3653 | bpstat_clear (&stop_bpstat); |
3654 | stop_bpstat = inf_status->stop_bpstat; | |
3655 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3656 | proceed_to_finish = inf_status->proceed_to_finish; | |
3657 | ||
72cec141 AC |
3658 | /* FIXME: Is the restore of stop_registers always needed. */ |
3659 | regcache_xfree (stop_registers); | |
3660 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3661 | |
3662 | /* The inferior can be gone if the user types "print exit(0)" | |
3663 | (and perhaps other times). */ | |
3664 | if (target_has_execution) | |
72cec141 AC |
3665 | /* NB: The register write goes through to the target. */ |
3666 | regcache_cpy (current_regcache, inf_status->registers); | |
3667 | regcache_xfree (inf_status->registers); | |
c906108c | 3668 | |
c906108c SS |
3669 | /* FIXME: If we are being called after stopping in a function which |
3670 | is called from gdb, we should not be trying to restore the | |
3671 | selected frame; it just prints a spurious error message (The | |
3672 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3673 | clobbers the stack)). In fact, should we be restoring the | |
3674 | inferior status at all in that case? . */ | |
3675 | ||
3676 | if (target_has_stack && inf_status->restore_stack_info) | |
3677 | { | |
c906108c | 3678 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3679 | walking the stack might encounter a garbage pointer and |
3680 | error() trying to dereference it. */ | |
488f131b JB |
3681 | if (catch_errors |
3682 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3683 | "Unable to restore previously selected frame:\n", | |
3684 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3685 | /* Error in restoring the selected frame. Select the innermost |
3686 | frame. */ | |
0f7d239c | 3687 | select_frame (get_current_frame ()); |
c906108c SS |
3688 | |
3689 | } | |
c906108c | 3690 | |
72cec141 | 3691 | xfree (inf_status); |
7a292a7a | 3692 | } |
c906108c | 3693 | |
74b7792f AC |
3694 | static void |
3695 | do_restore_inferior_status_cleanup (void *sts) | |
3696 | { | |
3697 | restore_inferior_status (sts); | |
3698 | } | |
3699 | ||
3700 | struct cleanup * | |
3701 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3702 | { | |
3703 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3704 | } | |
3705 | ||
c906108c | 3706 | void |
96baa820 | 3707 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3708 | { |
3709 | /* See save_inferior_status for info on stop_bpstat. */ | |
3710 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3711 | regcache_xfree (inf_status->registers); |
3712 | regcache_xfree (inf_status->stop_registers); | |
3713 | xfree (inf_status); | |
7a292a7a SS |
3714 | } |
3715 | ||
47932f85 DJ |
3716 | int |
3717 | inferior_has_forked (int pid, int *child_pid) | |
3718 | { | |
3719 | struct target_waitstatus last; | |
3720 | ptid_t last_ptid; | |
3721 | ||
3722 | get_last_target_status (&last_ptid, &last); | |
3723 | ||
3724 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3725 | return 0; | |
3726 | ||
3727 | if (ptid_get_pid (last_ptid) != pid) | |
3728 | return 0; | |
3729 | ||
3730 | *child_pid = last.value.related_pid; | |
3731 | return 1; | |
3732 | } | |
3733 | ||
3734 | int | |
3735 | inferior_has_vforked (int pid, int *child_pid) | |
3736 | { | |
3737 | struct target_waitstatus last; | |
3738 | ptid_t last_ptid; | |
3739 | ||
3740 | get_last_target_status (&last_ptid, &last); | |
3741 | ||
3742 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3743 | return 0; | |
3744 | ||
3745 | if (ptid_get_pid (last_ptid) != pid) | |
3746 | return 0; | |
3747 | ||
3748 | *child_pid = last.value.related_pid; | |
3749 | return 1; | |
3750 | } | |
3751 | ||
3752 | int | |
3753 | inferior_has_execd (int pid, char **execd_pathname) | |
3754 | { | |
3755 | struct target_waitstatus last; | |
3756 | ptid_t last_ptid; | |
3757 | ||
3758 | get_last_target_status (&last_ptid, &last); | |
3759 | ||
3760 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3761 | return 0; | |
3762 | ||
3763 | if (ptid_get_pid (last_ptid) != pid) | |
3764 | return 0; | |
3765 | ||
3766 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3767 | return 1; | |
3768 | } | |
3769 | ||
ca6724c1 KB |
3770 | /* Oft used ptids */ |
3771 | ptid_t null_ptid; | |
3772 | ptid_t minus_one_ptid; | |
3773 | ||
3774 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3775 | |
ca6724c1 KB |
3776 | ptid_t |
3777 | ptid_build (int pid, long lwp, long tid) | |
3778 | { | |
3779 | ptid_t ptid; | |
3780 | ||
3781 | ptid.pid = pid; | |
3782 | ptid.lwp = lwp; | |
3783 | ptid.tid = tid; | |
3784 | return ptid; | |
3785 | } | |
3786 | ||
3787 | /* Create a ptid from just a pid. */ | |
3788 | ||
3789 | ptid_t | |
3790 | pid_to_ptid (int pid) | |
3791 | { | |
3792 | return ptid_build (pid, 0, 0); | |
3793 | } | |
3794 | ||
3795 | /* Fetch the pid (process id) component from a ptid. */ | |
3796 | ||
3797 | int | |
3798 | ptid_get_pid (ptid_t ptid) | |
3799 | { | |
3800 | return ptid.pid; | |
3801 | } | |
3802 | ||
3803 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3804 | ||
3805 | long | |
3806 | ptid_get_lwp (ptid_t ptid) | |
3807 | { | |
3808 | return ptid.lwp; | |
3809 | } | |
3810 | ||
3811 | /* Fetch the tid (thread id) component from a ptid. */ | |
3812 | ||
3813 | long | |
3814 | ptid_get_tid (ptid_t ptid) | |
3815 | { | |
3816 | return ptid.tid; | |
3817 | } | |
3818 | ||
3819 | /* ptid_equal() is used to test equality of two ptids. */ | |
3820 | ||
3821 | int | |
3822 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3823 | { | |
3824 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3825 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3826 | } |
3827 | ||
3828 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3829 | to restore the inferior_ptid value saved in a call to | |
3830 | save_inferior_ptid(). */ | |
ce696e05 KB |
3831 | |
3832 | static void | |
3833 | restore_inferior_ptid (void *arg) | |
3834 | { | |
3835 | ptid_t *saved_ptid_ptr = arg; | |
3836 | inferior_ptid = *saved_ptid_ptr; | |
3837 | xfree (arg); | |
3838 | } | |
3839 | ||
3840 | /* Save the value of inferior_ptid so that it may be restored by a | |
3841 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3842 | needed for later doing the cleanup. */ | |
3843 | ||
3844 | struct cleanup * | |
3845 | save_inferior_ptid (void) | |
3846 | { | |
3847 | ptid_t *saved_ptid_ptr; | |
3848 | ||
3849 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3850 | *saved_ptid_ptr = inferior_ptid; | |
3851 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3852 | } | |
c5aa993b | 3853 | \f |
488f131b | 3854 | |
7a292a7a | 3855 | static void |
96baa820 | 3856 | build_infrun (void) |
7a292a7a | 3857 | { |
72cec141 | 3858 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3859 | } |
c906108c | 3860 | |
c906108c | 3861 | void |
96baa820 | 3862 | _initialize_infrun (void) |
c906108c | 3863 | { |
52f0bd74 AC |
3864 | int i; |
3865 | int numsigs; | |
c906108c SS |
3866 | struct cmd_list_element *c; |
3867 | ||
046a4708 AC |
3868 | DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers); |
3869 | deprecated_register_gdbarch_swap (NULL, 0, build_infrun); | |
0f71a2f6 | 3870 | |
c906108c SS |
3871 | add_info ("signals", signals_info, |
3872 | "What debugger does when program gets various signals.\n\ | |
3873 | Specify a signal as argument to print info on that signal only."); | |
3874 | add_info_alias ("handle", "signals", 0); | |
3875 | ||
3876 | add_com ("handle", class_run, handle_command, | |
3877 | concat ("Specify how to handle a signal.\n\ | |
3878 | Args are signals and actions to apply to those signals.\n\ | |
3879 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3880 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3881 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3882 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3883 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
3884 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3885 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3886 | Print means print a message if this signal happens.\n\ | |
3887 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3888 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3889 | Pass and Stop may be combined.", NULL)); | |
3890 | if (xdb_commands) | |
3891 | { | |
3892 | add_com ("lz", class_info, signals_info, | |
3893 | "What debugger does when program gets various signals.\n\ | |
3894 | Specify a signal as argument to print info on that signal only."); | |
3895 | add_com ("z", class_run, xdb_handle_command, | |
3896 | concat ("Specify how to handle a signal.\n\ | |
3897 | Args are signals and actions to apply to those signals.\n\ | |
3898 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3899 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3900 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3901 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3902 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
c906108c SS |
3903 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3904 | nopass), \"Q\" (noprint)\n\ | |
3905 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3906 | Print means print a message if this signal happens.\n\ | |
3907 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3908 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3909 | Pass and Stop may be combined.", NULL)); | |
3910 | } | |
3911 | ||
3912 | if (!dbx_commands) | |
488f131b JB |
3913 | stop_command = |
3914 | 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 |
3915 | This allows you to set a list of commands to be run each time execution\n\ |
3916 | of the program stops.", &cmdlist); | |
3917 | ||
527159b7 RC |
3918 | add_set_cmd ("infrun", class_maintenance, var_zinteger, |
3919 | &debug_infrun, "Set inferior debugging.\n\ | |
3920 | When non-zero, inferior specific debugging is enabled.", &setdebuglist); | |
3921 | ||
c906108c | 3922 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 3923 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
3924 | signal_print = (unsigned char *) |
3925 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3926 | signal_program = (unsigned char *) | |
3927 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3928 | for (i = 0; i < numsigs; i++) | |
3929 | { | |
3930 | signal_stop[i] = 1; | |
3931 | signal_print[i] = 1; | |
3932 | signal_program[i] = 1; | |
3933 | } | |
3934 | ||
3935 | /* Signals caused by debugger's own actions | |
3936 | should not be given to the program afterwards. */ | |
3937 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
3938 | signal_program[TARGET_SIGNAL_INT] = 0; | |
3939 | ||
3940 | /* Signals that are not errors should not normally enter the debugger. */ | |
3941 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
3942 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
3943 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
3944 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
3945 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
3946 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
3947 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
3948 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
3949 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
3950 | signal_print[TARGET_SIGNAL_IO] = 0; | |
3951 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
3952 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
3953 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
3954 | signal_print[TARGET_SIGNAL_URG] = 0; | |
3955 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
3956 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
3957 | ||
cd0fc7c3 SS |
3958 | /* These signals are used internally by user-level thread |
3959 | implementations. (See signal(5) on Solaris.) Like the above | |
3960 | signals, a healthy program receives and handles them as part of | |
3961 | its normal operation. */ | |
3962 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
3963 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
3964 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
3965 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
3966 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
3967 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
3968 | ||
c906108c | 3969 | #ifdef SOLIB_ADD |
cb1a6d5f | 3970 | deprecated_add_show_from_set |
c906108c SS |
3971 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, |
3972 | (char *) &stop_on_solib_events, | |
3973 | "Set stopping for shared library events.\n\ | |
3974 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
3975 | notifies gdb of shared library events. The most common event of interest\n\ | |
488f131b | 3976 | to the user would be loading/unloading of a new library.\n", &setlist), &showlist); |
c906108c SS |
3977 | #endif |
3978 | ||
3979 | c = add_set_enum_cmd ("follow-fork-mode", | |
3980 | class_run, | |
488f131b | 3981 | follow_fork_mode_kind_names, &follow_fork_mode_string, |
c906108c SS |
3982 | "Set debugger response to a program call of fork \ |
3983 | or vfork.\n\ | |
3984 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
3985 | parent - the original process is debugged after a fork\n\ | |
3986 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 3987 | The unfollowed process will continue to run.\n\ |
488f131b | 3988 | By default, the debugger will follow the parent process.", &setlist); |
cb1a6d5f | 3989 | deprecated_add_show_from_set (c, &showlist); |
c906108c | 3990 | |
488f131b | 3991 | c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */ |
1ed2a135 | 3992 | &scheduler_mode, /* current mode */ |
c906108c SS |
3993 | "Set mode for locking scheduler during execution.\n\ |
3994 | off == no locking (threads may preempt at any time)\n\ | |
3995 | on == full locking (no thread except the current thread may run)\n\ | |
3996 | step == scheduler locked during every single-step operation.\n\ | |
3997 | In this mode, no other thread may run during a step command.\n\ | |
488f131b | 3998 | Other threads may run while stepping over a function call ('next').", &setlist); |
c906108c | 3999 | |
9f60d481 | 4000 | set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */ |
cb1a6d5f | 4001 | deprecated_add_show_from_set (c, &showlist); |
5fbbeb29 CF |
4002 | |
4003 | c = add_set_cmd ("step-mode", class_run, | |
488f131b JB |
4004 | var_boolean, (char *) &step_stop_if_no_debug, |
4005 | "Set mode of the step operation. When set, doing a step over a\n\ | |
5fbbeb29 CF |
4006 | function without debug line information will stop at the first\n\ |
4007 | instruction of that function. Otherwise, the function is skipped and\n\ | |
488f131b | 4008 | the step command stops at a different source line.", &setlist); |
cb1a6d5f | 4009 | deprecated_add_show_from_set (c, &showlist); |
ca6724c1 KB |
4010 | |
4011 | /* ptid initializations */ | |
4012 | null_ptid = ptid_build (0, 0, 0); | |
4013 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4014 | inferior_ptid = null_ptid; | |
4015 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 4016 | } |