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 | ||
c906108c SS |
166 | /* On some systems, the PC may be left pointing at an instruction that won't |
167 | actually be executed. This is usually indicated by a bit in the PSW. If | |
168 | we find ourselves in such a state, then we step the target beyond the | |
169 | nullified instruction before returning control to the user so as to avoid | |
170 | confusion. */ | |
171 | ||
172 | #ifndef INSTRUCTION_NULLIFIED | |
173 | #define INSTRUCTION_NULLIFIED 0 | |
174 | #endif | |
175 | ||
c2c6d25f JM |
176 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
177 | can't remove it. Instead, we have to advance the PC to the next | |
178 | instruction. This macro should expand to a pointer to a function that | |
179 | does that, or zero if we have no such function. If we don't have a | |
180 | definition for it, we have to report an error. */ | |
488f131b | 181 | #ifndef SKIP_PERMANENT_BREAKPOINT |
c2c6d25f JM |
182 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) |
183 | static void | |
c2d11a7d | 184 | default_skip_permanent_breakpoint (void) |
c2c6d25f | 185 | { |
255e7dbf | 186 | error ("\ |
c2c6d25f JM |
187 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ |
188 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
255e7dbf | 189 | a command like `return' or `jump' to continue execution."); |
c2c6d25f JM |
190 | } |
191 | #endif | |
488f131b | 192 | |
c2c6d25f | 193 | |
7a292a7a SS |
194 | /* Convert the #defines into values. This is temporary until wfi control |
195 | flow is completely sorted out. */ | |
196 | ||
197 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
198 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
199 | #else | |
200 | #undef HAVE_STEPPABLE_WATCHPOINT | |
201 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
202 | #endif | |
203 | ||
692590c1 MS |
204 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
205 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
206 | #else | |
207 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
208 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
209 | #endif | |
210 | ||
c906108c SS |
211 | /* Tables of how to react to signals; the user sets them. */ |
212 | ||
213 | static unsigned char *signal_stop; | |
214 | static unsigned char *signal_print; | |
215 | static unsigned char *signal_program; | |
216 | ||
217 | #define SET_SIGS(nsigs,sigs,flags) \ | |
218 | do { \ | |
219 | int signum = (nsigs); \ | |
220 | while (signum-- > 0) \ | |
221 | if ((sigs)[signum]) \ | |
222 | (flags)[signum] = 1; \ | |
223 | } while (0) | |
224 | ||
225 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
226 | do { \ | |
227 | int signum = (nsigs); \ | |
228 | while (signum-- > 0) \ | |
229 | if ((sigs)[signum]) \ | |
230 | (flags)[signum] = 0; \ | |
231 | } while (0) | |
232 | ||
39f77062 KB |
233 | /* Value to pass to target_resume() to cause all threads to resume */ |
234 | ||
235 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
236 | |
237 | /* Command list pointer for the "stop" placeholder. */ | |
238 | ||
239 | static struct cmd_list_element *stop_command; | |
240 | ||
241 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
242 | ||
243 | static int breakpoints_inserted; | |
244 | ||
245 | /* Function inferior was in as of last step command. */ | |
246 | ||
247 | static struct symbol *step_start_function; | |
248 | ||
249 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
250 | ||
251 | static int trap_expected; | |
252 | ||
253 | #ifdef SOLIB_ADD | |
254 | /* Nonzero if we want to give control to the user when we're notified | |
255 | of shared library events by the dynamic linker. */ | |
256 | static int stop_on_solib_events; | |
257 | #endif | |
258 | ||
c906108c SS |
259 | /* Nonzero means expecting a trace trap |
260 | and should stop the inferior and return silently when it happens. */ | |
261 | ||
262 | int stop_after_trap; | |
263 | ||
264 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
265 | It is used after attach, due to attaching to a process; | |
266 | when running in the shell before the child program has been exec'd; | |
267 | and when running some kinds of remote stuff (FIXME?). */ | |
268 | ||
c0236d92 | 269 | enum stop_kind stop_soon; |
c906108c SS |
270 | |
271 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
272 | situation when stop_registers should be saved. */ | |
273 | ||
274 | int proceed_to_finish; | |
275 | ||
276 | /* Save register contents here when about to pop a stack dummy frame, | |
277 | if-and-only-if proceed_to_finish is set. | |
278 | Thus this contains the return value from the called function (assuming | |
279 | values are returned in a register). */ | |
280 | ||
72cec141 | 281 | struct regcache *stop_registers; |
c906108c SS |
282 | |
283 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
284 | ||
285 | static int breakpoints_failed; | |
286 | ||
287 | /* Nonzero after stop if current stack frame should be printed. */ | |
288 | ||
289 | static int stop_print_frame; | |
290 | ||
291 | static struct breakpoint *step_resume_breakpoint = NULL; | |
c906108c SS |
292 | |
293 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
294 | interactions with an inferior that is running a kernel function | |
295 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
296 | may have a need to know when the inferior is in a syscall. This | |
297 | is a count of the number of inferior threads which are known to | |
298 | currently be running in a syscall. */ | |
299 | static int number_of_threads_in_syscalls; | |
300 | ||
e02bc4cc | 301 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
302 | returned by target_wait()/deprecated_target_wait_hook(). This |
303 | information is returned by get_last_target_status(). */ | |
39f77062 | 304 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
305 | static struct target_waitstatus target_last_waitstatus; |
306 | ||
c906108c SS |
307 | /* This is used to remember when a fork, vfork or exec event |
308 | was caught by a catchpoint, and thus the event is to be | |
309 | followed at the next resume of the inferior, and not | |
310 | immediately. */ | |
311 | static struct | |
488f131b JB |
312 | { |
313 | enum target_waitkind kind; | |
314 | struct | |
c906108c | 315 | { |
488f131b | 316 | int parent_pid; |
488f131b | 317 | int child_pid; |
c906108c | 318 | } |
488f131b JB |
319 | fork_event; |
320 | char *execd_pathname; | |
321 | } | |
c906108c SS |
322 | pending_follow; |
323 | ||
53904c9e AC |
324 | static const char follow_fork_mode_child[] = "child"; |
325 | static const char follow_fork_mode_parent[] = "parent"; | |
326 | ||
488f131b | 327 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
328 | follow_fork_mode_child, |
329 | follow_fork_mode_parent, | |
330 | NULL | |
ef346e04 | 331 | }; |
c906108c | 332 | |
53904c9e | 333 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
c906108c SS |
334 | \f |
335 | ||
6604731b | 336 | static int |
4ef3f3be | 337 | follow_fork (void) |
c906108c | 338 | { |
ea1dd7bc | 339 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
c906108c | 340 | |
6604731b | 341 | return target_follow_fork (follow_child); |
c906108c SS |
342 | } |
343 | ||
6604731b DJ |
344 | void |
345 | follow_inferior_reset_breakpoints (void) | |
c906108c | 346 | { |
6604731b DJ |
347 | /* Was there a step_resume breakpoint? (There was if the user |
348 | did a "next" at the fork() call.) If so, explicitly reset its | |
349 | thread number. | |
350 | ||
351 | step_resumes are a form of bp that are made to be per-thread. | |
352 | Since we created the step_resume bp when the parent process | |
353 | was being debugged, and now are switching to the child process, | |
354 | from the breakpoint package's viewpoint, that's a switch of | |
355 | "threads". We must update the bp's notion of which thread | |
356 | it is for, or it'll be ignored when it triggers. */ | |
357 | ||
358 | if (step_resume_breakpoint) | |
359 | breakpoint_re_set_thread (step_resume_breakpoint); | |
360 | ||
361 | /* Reinsert all breakpoints in the child. The user may have set | |
362 | breakpoints after catching the fork, in which case those | |
363 | were never set in the child, but only in the parent. This makes | |
364 | sure the inserted breakpoints match the breakpoint list. */ | |
365 | ||
366 | breakpoint_re_set (); | |
367 | insert_breakpoints (); | |
c906108c | 368 | } |
c906108c | 369 | |
1adeb98a FN |
370 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
371 | ||
c906108c | 372 | static void |
96baa820 | 373 | follow_exec (int pid, char *execd_pathname) |
c906108c | 374 | { |
c906108c | 375 | int saved_pid = pid; |
7a292a7a SS |
376 | struct target_ops *tgt; |
377 | ||
378 | if (!may_follow_exec) | |
379 | return; | |
c906108c | 380 | |
c906108c SS |
381 | /* This is an exec event that we actually wish to pay attention to. |
382 | Refresh our symbol table to the newly exec'd program, remove any | |
383 | momentary bp's, etc. | |
384 | ||
385 | If there are breakpoints, they aren't really inserted now, | |
386 | since the exec() transformed our inferior into a fresh set | |
387 | of instructions. | |
388 | ||
389 | We want to preserve symbolic breakpoints on the list, since | |
390 | we have hopes that they can be reset after the new a.out's | |
391 | symbol table is read. | |
392 | ||
393 | However, any "raw" breakpoints must be removed from the list | |
394 | (e.g., the solib bp's), since their address is probably invalid | |
395 | now. | |
396 | ||
397 | And, we DON'T want to call delete_breakpoints() here, since | |
398 | that may write the bp's "shadow contents" (the instruction | |
399 | value that was overwritten witha TRAP instruction). Since | |
400 | we now have a new a.out, those shadow contents aren't valid. */ | |
401 | update_breakpoints_after_exec (); | |
402 | ||
403 | /* If there was one, it's gone now. We cannot truly step-to-next | |
404 | statement through an exec(). */ | |
405 | step_resume_breakpoint = NULL; | |
406 | step_range_start = 0; | |
407 | step_range_end = 0; | |
408 | ||
c906108c SS |
409 | /* What is this a.out's name? */ |
410 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
411 | ||
412 | /* We've followed the inferior through an exec. Therefore, the | |
413 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
414 | |
415 | /* First collect the run target in effect. */ | |
416 | tgt = find_run_target (); | |
417 | /* If we can't find one, things are in a very strange state... */ | |
418 | if (tgt == NULL) | |
419 | error ("Could find run target to save before following exec"); | |
420 | ||
c906108c SS |
421 | gdb_flush (gdb_stdout); |
422 | target_mourn_inferior (); | |
39f77062 | 423 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 424 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 425 | push_target (tgt); |
c906108c SS |
426 | |
427 | /* That a.out is now the one to use. */ | |
428 | exec_file_attach (execd_pathname, 0); | |
429 | ||
430 | /* And also is where symbols can be found. */ | |
1adeb98a | 431 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
432 | |
433 | /* Reset the shared library package. This ensures that we get | |
434 | a shlib event when the child reaches "_start", at which point | |
435 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 436 | #if defined(SOLIB_RESTART) |
c906108c | 437 | SOLIB_RESTART (); |
7a292a7a SS |
438 | #endif |
439 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 440 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
7a292a7a | 441 | #endif |
c906108c SS |
442 | |
443 | /* Reinsert all breakpoints. (Those which were symbolic have | |
444 | been reset to the proper address in the new a.out, thanks | |
445 | to symbol_file_command...) */ | |
446 | insert_breakpoints (); | |
447 | ||
448 | /* The next resume of this inferior should bring it to the shlib | |
449 | startup breakpoints. (If the user had also set bp's on | |
450 | "main" from the old (parent) process, then they'll auto- | |
451 | matically get reset there in the new process.) */ | |
c906108c SS |
452 | } |
453 | ||
454 | /* Non-zero if we just simulating a single-step. This is needed | |
455 | because we cannot remove the breakpoints in the inferior process | |
456 | until after the `wait' in `wait_for_inferior'. */ | |
457 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
458 | |
459 | /* The thread we inserted single-step breakpoints for. */ | |
460 | static ptid_t singlestep_ptid; | |
461 | ||
462 | /* If another thread hit the singlestep breakpoint, we save the original | |
463 | thread here so that we can resume single-stepping it later. */ | |
464 | static ptid_t saved_singlestep_ptid; | |
465 | static int stepping_past_singlestep_breakpoint; | |
c906108c SS |
466 | \f |
467 | ||
468 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 469 | static void |
74b7792f | 470 | resume_cleanups (void *ignore) |
c906108c SS |
471 | { |
472 | normal_stop (); | |
473 | } | |
474 | ||
53904c9e AC |
475 | static const char schedlock_off[] = "off"; |
476 | static const char schedlock_on[] = "on"; | |
477 | static const char schedlock_step[] = "step"; | |
478 | static const char *scheduler_mode = schedlock_off; | |
488f131b | 479 | static const char *scheduler_enums[] = { |
ef346e04 AC |
480 | schedlock_off, |
481 | schedlock_on, | |
482 | schedlock_step, | |
483 | NULL | |
484 | }; | |
c906108c SS |
485 | |
486 | static void | |
96baa820 | 487 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 488 | { |
cb1a6d5f AC |
489 | /* NOTE: cagney/2002-03-17: The deprecated_add_show_from_set() |
490 | function clones the set command passed as a parameter. The clone | |
491 | operation will include (BUG?) any ``set'' command callback, if | |
492 | present. Commands like ``info set'' call all the ``show'' | |
493 | command callbacks. Unfortunately, for ``show'' commands cloned | |
494 | from ``set'', this includes callbacks belonging to ``set'' | |
495 | commands. Making this worse, this only occures if | |
496 | deprecated_add_show_from_set() is called after add_cmd_sfunc() | |
497 | (BUG?). */ | |
1868c04e | 498 | if (cmd_type (c) == set_cmd) |
c906108c SS |
499 | if (!target_can_lock_scheduler) |
500 | { | |
501 | scheduler_mode = schedlock_off; | |
488f131b | 502 | error ("Target '%s' cannot support this command.", target_shortname); |
c906108c SS |
503 | } |
504 | } | |
505 | ||
506 | ||
507 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
508 | wants to interrupt some lengthy single-stepping operation | |
509 | (for child processes, the SIGINT goes to the inferior, and so | |
510 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
511 | other targets, that's not true). | |
512 | ||
513 | STEP nonzero if we should step (zero to continue instead). | |
514 | SIG is the signal to give the inferior (zero for none). */ | |
515 | void | |
96baa820 | 516 | resume (int step, enum target_signal sig) |
c906108c SS |
517 | { |
518 | int should_resume = 1; | |
74b7792f | 519 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
520 | QUIT; |
521 | ||
527159b7 RC |
522 | if (debug_infrun) |
523 | printf_unfiltered ("infrun: resume (step=%d, signal=%d)\n", step, sig); | |
524 | ||
ef5cf84e MS |
525 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
526 | ||
c906108c | 527 | |
692590c1 MS |
528 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
529 | over an instruction that causes a page fault without triggering | |
530 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
531 | stop, because the hardware watchpoint is not triggered, but it forgets | |
532 | the step request and continues the program normally. | |
533 | Work around the problem by removing hardware watchpoints if a step is | |
534 | requested, GDB will check for a hardware watchpoint trigger after the | |
535 | step anyway. */ | |
536 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
537 | remove_hw_watchpoints (); | |
488f131b | 538 | |
692590c1 | 539 | |
c2c6d25f JM |
540 | /* Normally, by the time we reach `resume', the breakpoints are either |
541 | removed or inserted, as appropriate. The exception is if we're sitting | |
542 | at a permanent breakpoint; we need to step over it, but permanent | |
543 | breakpoints can't be removed. So we have to test for it here. */ | |
544 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
545 | SKIP_PERMANENT_BREAKPOINT (); | |
546 | ||
b0ed3589 | 547 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
548 | { |
549 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 550 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
551 | /* ...and don't ask hardware to do it. */ |
552 | step = 0; | |
553 | /* and do not pull these breakpoints until after a `wait' in | |
554 | `wait_for_inferior' */ | |
555 | singlestep_breakpoints_inserted_p = 1; | |
9f976b41 | 556 | singlestep_ptid = inferior_ptid; |
c906108c SS |
557 | } |
558 | ||
c906108c | 559 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 560 | now to be followed, then do so. */ |
c906108c SS |
561 | switch (pending_follow.kind) |
562 | { | |
6604731b DJ |
563 | case TARGET_WAITKIND_FORKED: |
564 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 565 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
566 | if (follow_fork ()) |
567 | should_resume = 0; | |
c906108c SS |
568 | break; |
569 | ||
6604731b | 570 | case TARGET_WAITKIND_EXECD: |
c906108c | 571 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 572 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
573 | break; |
574 | ||
575 | default: | |
576 | break; | |
577 | } | |
c906108c SS |
578 | |
579 | /* Install inferior's terminal modes. */ | |
580 | target_terminal_inferior (); | |
581 | ||
582 | if (should_resume) | |
583 | { | |
39f77062 | 584 | ptid_t resume_ptid; |
dfcd3bfb | 585 | |
488f131b | 586 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e | 587 | |
8fb3e588 AC |
588 | if ((step || singlestep_breakpoints_inserted_p) |
589 | && (stepping_past_singlestep_breakpoint | |
590 | || (!breakpoints_inserted && breakpoint_here_p (read_pc ())))) | |
c906108c | 591 | { |
ef5cf84e MS |
592 | /* Stepping past a breakpoint without inserting breakpoints. |
593 | Make sure only the current thread gets to step, so that | |
594 | other threads don't sneak past breakpoints while they are | |
595 | not inserted. */ | |
c906108c | 596 | |
ef5cf84e | 597 | resume_ptid = inferior_ptid; |
c906108c | 598 | } |
ef5cf84e | 599 | |
8fb3e588 AC |
600 | if ((scheduler_mode == schedlock_on) |
601 | || (scheduler_mode == schedlock_step | |
602 | && (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 603 | { |
ef5cf84e | 604 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 605 | resume_ptid = inferior_ptid; |
c906108c | 606 | } |
ef5cf84e | 607 | |
c4ed33b9 AC |
608 | if (CANNOT_STEP_BREAKPOINT) |
609 | { | |
610 | /* Most targets can step a breakpoint instruction, thus | |
611 | executing it normally. But if this one cannot, just | |
612 | continue and we will hit it anyway. */ | |
613 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
614 | step = 0; | |
615 | } | |
39f77062 | 616 | target_resume (resume_ptid, step, sig); |
c906108c SS |
617 | } |
618 | ||
619 | discard_cleanups (old_cleanups); | |
620 | } | |
621 | \f | |
622 | ||
623 | /* Clear out all variables saying what to do when inferior is continued. | |
624 | First do this, then set the ones you want, then call `proceed'. */ | |
625 | ||
626 | void | |
96baa820 | 627 | clear_proceed_status (void) |
c906108c SS |
628 | { |
629 | trap_expected = 0; | |
630 | step_range_start = 0; | |
631 | step_range_end = 0; | |
aa0cd9c1 | 632 | step_frame_id = null_frame_id; |
5fbbeb29 | 633 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c | 634 | stop_after_trap = 0; |
c0236d92 | 635 | stop_soon = NO_STOP_QUIETLY; |
c906108c SS |
636 | proceed_to_finish = 0; |
637 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
638 | ||
639 | /* Discard any remaining commands or status from previous stop. */ | |
640 | bpstat_clear (&stop_bpstat); | |
641 | } | |
642 | ||
ea67f13b DJ |
643 | /* This should be suitable for any targets that support threads. */ |
644 | ||
645 | static int | |
646 | prepare_to_proceed (void) | |
647 | { | |
648 | ptid_t wait_ptid; | |
649 | struct target_waitstatus wait_status; | |
650 | ||
651 | /* Get the last target status returned by target_wait(). */ | |
652 | get_last_target_status (&wait_ptid, &wait_status); | |
653 | ||
654 | /* Make sure we were stopped either at a breakpoint, or because | |
655 | of a Ctrl-C. */ | |
656 | if (wait_status.kind != TARGET_WAITKIND_STOPPED | |
8fb3e588 AC |
657 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
658 | && wait_status.value.sig != TARGET_SIGNAL_INT)) | |
ea67f13b DJ |
659 | { |
660 | return 0; | |
661 | } | |
662 | ||
663 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
664 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
665 | { | |
666 | /* Switched over from WAIT_PID. */ | |
667 | CORE_ADDR wait_pc = read_pc_pid (wait_ptid); | |
668 | ||
669 | if (wait_pc != read_pc ()) | |
670 | { | |
671 | /* Switch back to WAIT_PID thread. */ | |
672 | inferior_ptid = wait_ptid; | |
673 | ||
674 | /* FIXME: This stuff came from switch_to_thread() in | |
675 | thread.c (which should probably be a public function). */ | |
676 | flush_cached_frames (); | |
677 | registers_changed (); | |
678 | stop_pc = wait_pc; | |
679 | select_frame (get_current_frame ()); | |
680 | } | |
681 | ||
8fb3e588 AC |
682 | /* We return 1 to indicate that there is a breakpoint here, |
683 | so we need to step over it before continuing to avoid | |
684 | hitting it straight away. */ | |
685 | if (breakpoint_here_p (wait_pc)) | |
686 | return 1; | |
ea67f13b DJ |
687 | } |
688 | ||
689 | return 0; | |
8fb3e588 | 690 | |
ea67f13b | 691 | } |
e4846b08 JJ |
692 | |
693 | /* Record the pc of the program the last time it stopped. This is | |
694 | just used internally by wait_for_inferior, but need to be preserved | |
695 | over calls to it and cleared when the inferior is started. */ | |
696 | static CORE_ADDR prev_pc; | |
697 | ||
c906108c SS |
698 | /* Basic routine for continuing the program in various fashions. |
699 | ||
700 | ADDR is the address to resume at, or -1 for resume where stopped. | |
701 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 702 | or -1 for act according to how it stopped. |
c906108c | 703 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
704 | -1 means return after that and print nothing. |
705 | You should probably set various step_... variables | |
706 | before calling here, if you are stepping. | |
c906108c SS |
707 | |
708 | You should call clear_proceed_status before calling proceed. */ | |
709 | ||
710 | void | |
96baa820 | 711 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
712 | { |
713 | int oneproc = 0; | |
714 | ||
715 | if (step > 0) | |
716 | step_start_function = find_pc_function (read_pc ()); | |
717 | if (step < 0) | |
718 | stop_after_trap = 1; | |
719 | ||
2acceee2 | 720 | if (addr == (CORE_ADDR) -1) |
c906108c | 721 | { |
c906108c | 722 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
3352ef37 AC |
723 | /* There is a breakpoint at the address we will resume at, |
724 | step one instruction before inserting breakpoints so that | |
725 | we do not stop right away (and report a second hit at this | |
726 | breakpoint). */ | |
c906108c | 727 | oneproc = 1; |
3352ef37 AC |
728 | else if (gdbarch_single_step_through_delay_p (current_gdbarch) |
729 | && gdbarch_single_step_through_delay (current_gdbarch, | |
730 | get_current_frame ())) | |
731 | /* We stepped onto an instruction that needs to be stepped | |
732 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
733 | oneproc = 1; |
734 | } | |
735 | else | |
736 | { | |
737 | write_pc (addr); | |
c906108c SS |
738 | } |
739 | ||
527159b7 RC |
740 | if (debug_infrun) |
741 | printf_unfiltered ("infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", | |
742 | paddr_nz (addr), siggnal, step); | |
743 | ||
c906108c SS |
744 | /* In a multi-threaded task we may select another thread |
745 | and then continue or step. | |
746 | ||
747 | But if the old thread was stopped at a breakpoint, it | |
748 | will immediately cause another breakpoint stop without | |
749 | any execution (i.e. it will report a breakpoint hit | |
750 | incorrectly). So we must step over it first. | |
751 | ||
ea67f13b | 752 | prepare_to_proceed checks the current thread against the thread |
c906108c SS |
753 | that reported the most recent event. If a step-over is required |
754 | it returns TRUE and sets the current thread to the old thread. */ | |
ea67f13b DJ |
755 | if (prepare_to_proceed () && breakpoint_here_p (read_pc ())) |
756 | oneproc = 1; | |
c906108c | 757 | |
c906108c SS |
758 | if (oneproc) |
759 | /* We will get a trace trap after one instruction. | |
760 | Continue it automatically and insert breakpoints then. */ | |
761 | trap_expected = 1; | |
762 | else | |
763 | { | |
81d0cc19 GS |
764 | insert_breakpoints (); |
765 | /* If we get here there was no call to error() in | |
8fb3e588 | 766 | insert breakpoints -- so they were inserted. */ |
c906108c SS |
767 | breakpoints_inserted = 1; |
768 | } | |
769 | ||
770 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
771 | stop_signal = siggnal; | |
772 | /* If this signal should not be seen by program, | |
773 | give it zero. Used for debugging signals. */ | |
774 | else if (!signal_program[stop_signal]) | |
775 | stop_signal = TARGET_SIGNAL_0; | |
776 | ||
777 | annotate_starting (); | |
778 | ||
779 | /* Make sure that output from GDB appears before output from the | |
780 | inferior. */ | |
781 | gdb_flush (gdb_stdout); | |
782 | ||
e4846b08 JJ |
783 | /* Refresh prev_pc value just prior to resuming. This used to be |
784 | done in stop_stepping, however, setting prev_pc there did not handle | |
785 | scenarios such as inferior function calls or returning from | |
786 | a function via the return command. In those cases, the prev_pc | |
787 | value was not set properly for subsequent commands. The prev_pc value | |
788 | is used to initialize the starting line number in the ecs. With an | |
789 | invalid value, the gdb next command ends up stopping at the position | |
790 | represented by the next line table entry past our start position. | |
791 | On platforms that generate one line table entry per line, this | |
792 | is not a problem. However, on the ia64, the compiler generates | |
793 | extraneous line table entries that do not increase the line number. | |
794 | When we issue the gdb next command on the ia64 after an inferior call | |
795 | or a return command, we often end up a few instructions forward, still | |
796 | within the original line we started. | |
797 | ||
798 | An attempt was made to have init_execution_control_state () refresh | |
799 | the prev_pc value before calculating the line number. This approach | |
800 | did not work because on platforms that use ptrace, the pc register | |
801 | cannot be read unless the inferior is stopped. At that point, we | |
802 | are not guaranteed the inferior is stopped and so the read_pc () | |
803 | call can fail. Setting the prev_pc value here ensures the value is | |
8fb3e588 | 804 | updated correctly when the inferior is stopped. */ |
e4846b08 JJ |
805 | prev_pc = read_pc (); |
806 | ||
c906108c SS |
807 | /* Resume inferior. */ |
808 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
809 | ||
810 | /* Wait for it to stop (if not standalone) | |
811 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
812 | /* Do this only if we are not using the event loop, or if the target |
813 | does not support asynchronous execution. */ | |
362646f5 | 814 | if (!target_can_async_p ()) |
43ff13b4 JM |
815 | { |
816 | wait_for_inferior (); | |
817 | normal_stop (); | |
818 | } | |
c906108c | 819 | } |
c906108c SS |
820 | \f |
821 | ||
822 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 823 | |
c906108c | 824 | void |
96baa820 | 825 | start_remote (void) |
c906108c SS |
826 | { |
827 | init_thread_list (); | |
828 | init_wait_for_inferior (); | |
c0236d92 | 829 | stop_soon = STOP_QUIETLY; |
c906108c | 830 | trap_expected = 0; |
43ff13b4 | 831 | |
6426a772 JM |
832 | /* Always go on waiting for the target, regardless of the mode. */ |
833 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 834 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
835 | nothing is returned (instead of just blocking). Because of this, |
836 | targets expecting an immediate response need to, internally, set | |
837 | things up so that the target_wait() is forced to eventually | |
838 | timeout. */ | |
839 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
840 | differentiate to its caller what the state of the target is after | |
841 | the initial open has been performed. Here we're assuming that | |
842 | the target has stopped. It should be possible to eventually have | |
843 | target_open() return to the caller an indication that the target | |
844 | is currently running and GDB state should be set to the same as | |
845 | for an async run. */ | |
846 | wait_for_inferior (); | |
847 | normal_stop (); | |
c906108c SS |
848 | } |
849 | ||
850 | /* Initialize static vars when a new inferior begins. */ | |
851 | ||
852 | void | |
96baa820 | 853 | init_wait_for_inferior (void) |
c906108c SS |
854 | { |
855 | /* These are meaningless until the first time through wait_for_inferior. */ | |
856 | prev_pc = 0; | |
c906108c | 857 | |
c906108c SS |
858 | breakpoints_inserted = 0; |
859 | breakpoint_init_inferior (inf_starting); | |
860 | ||
861 | /* Don't confuse first call to proceed(). */ | |
862 | stop_signal = TARGET_SIGNAL_0; | |
863 | ||
864 | /* The first resume is not following a fork/vfork/exec. */ | |
865 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c SS |
866 | |
867 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
868 | number_of_threads_in_syscalls = 0; | |
869 | ||
870 | clear_proceed_status (); | |
9f976b41 DJ |
871 | |
872 | stepping_past_singlestep_breakpoint = 0; | |
c906108c | 873 | } |
c906108c | 874 | \f |
b83266a0 SS |
875 | /* This enum encodes possible reasons for doing a target_wait, so that |
876 | wfi can call target_wait in one place. (Ultimately the call will be | |
877 | moved out of the infinite loop entirely.) */ | |
878 | ||
c5aa993b JM |
879 | enum infwait_states |
880 | { | |
cd0fc7c3 SS |
881 | infwait_normal_state, |
882 | infwait_thread_hop_state, | |
883 | infwait_nullified_state, | |
884 | infwait_nonstep_watch_state | |
b83266a0 SS |
885 | }; |
886 | ||
11cf8741 JM |
887 | /* Why did the inferior stop? Used to print the appropriate messages |
888 | to the interface from within handle_inferior_event(). */ | |
889 | enum inferior_stop_reason | |
890 | { | |
891 | /* We don't know why. */ | |
892 | STOP_UNKNOWN, | |
893 | /* Step, next, nexti, stepi finished. */ | |
894 | END_STEPPING_RANGE, | |
895 | /* Found breakpoint. */ | |
896 | BREAKPOINT_HIT, | |
897 | /* Inferior terminated by signal. */ | |
898 | SIGNAL_EXITED, | |
899 | /* Inferior exited. */ | |
900 | EXITED, | |
901 | /* Inferior received signal, and user asked to be notified. */ | |
902 | SIGNAL_RECEIVED | |
903 | }; | |
904 | ||
cd0fc7c3 SS |
905 | /* This structure contains what used to be local variables in |
906 | wait_for_inferior. Probably many of them can return to being | |
907 | locals in handle_inferior_event. */ | |
908 | ||
c5aa993b | 909 | struct execution_control_state |
488f131b JB |
910 | { |
911 | struct target_waitstatus ws; | |
912 | struct target_waitstatus *wp; | |
913 | int another_trap; | |
914 | int random_signal; | |
915 | CORE_ADDR stop_func_start; | |
916 | CORE_ADDR stop_func_end; | |
917 | char *stop_func_name; | |
918 | struct symtab_and_line sal; | |
488f131b JB |
919 | int current_line; |
920 | struct symtab *current_symtab; | |
921 | int handling_longjmp; /* FIXME */ | |
922 | ptid_t ptid; | |
923 | ptid_t saved_inferior_ptid; | |
68f53502 | 924 | int step_after_step_resume_breakpoint; |
488f131b JB |
925 | int stepping_through_solib_after_catch; |
926 | bpstat stepping_through_solib_catchpoints; | |
927 | int enable_hw_watchpoints_after_wait; | |
488f131b JB |
928 | int new_thread_event; |
929 | struct target_waitstatus tmpstatus; | |
930 | enum infwait_states infwait_state; | |
931 | ptid_t waiton_ptid; | |
932 | int wait_some_more; | |
933 | }; | |
934 | ||
935 | void init_execution_control_state (struct execution_control_state *ecs); | |
936 | ||
937 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 938 | |
c2c6d25f | 939 | static void step_into_function (struct execution_control_state *ecs); |
44cbf7b5 AC |
940 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
941 | static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
942 | struct frame_id sr_id); | |
104c1213 JM |
943 | static void stop_stepping (struct execution_control_state *ecs); |
944 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 945 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
946 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
947 | int stop_info); | |
104c1213 | 948 | |
cd0fc7c3 SS |
949 | /* Wait for control to return from inferior to debugger. |
950 | If inferior gets a signal, we may decide to start it up again | |
951 | instead of returning. That is why there is a loop in this function. | |
952 | When this function actually returns it means the inferior | |
953 | should be left stopped and GDB should read more commands. */ | |
954 | ||
955 | void | |
96baa820 | 956 | wait_for_inferior (void) |
cd0fc7c3 SS |
957 | { |
958 | struct cleanup *old_cleanups; | |
959 | struct execution_control_state ecss; | |
960 | struct execution_control_state *ecs; | |
c906108c | 961 | |
527159b7 RC |
962 | if (debug_infrun) |
963 | printf_unfiltered ("infrun: wait_for_inferior\n"); | |
964 | ||
8601f500 | 965 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 966 | &step_resume_breakpoint); |
cd0fc7c3 SS |
967 | |
968 | /* wfi still stays in a loop, so it's OK just to take the address of | |
969 | a local to get the ecs pointer. */ | |
970 | ecs = &ecss; | |
971 | ||
972 | /* Fill in with reasonable starting values. */ | |
973 | init_execution_control_state (ecs); | |
974 | ||
c906108c | 975 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 976 | previous_inferior_ptid = inferior_ptid; |
c906108c | 977 | |
cd0fc7c3 SS |
978 | overlay_cache_invalid = 1; |
979 | ||
980 | /* We have to invalidate the registers BEFORE calling target_wait | |
981 | because they can be loaded from the target while in target_wait. | |
982 | This makes remote debugging a bit more efficient for those | |
983 | targets that provide critical registers as part of their normal | |
984 | status mechanism. */ | |
985 | ||
986 | registers_changed (); | |
b83266a0 | 987 | |
c906108c SS |
988 | while (1) |
989 | { | |
9a4105ab AC |
990 | if (deprecated_target_wait_hook) |
991 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); | |
cd0fc7c3 | 992 | else |
39f77062 | 993 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 994 | |
cd0fc7c3 SS |
995 | /* Now figure out what to do with the result of the result. */ |
996 | handle_inferior_event (ecs); | |
c906108c | 997 | |
cd0fc7c3 SS |
998 | if (!ecs->wait_some_more) |
999 | break; | |
1000 | } | |
1001 | do_cleanups (old_cleanups); | |
1002 | } | |
c906108c | 1003 | |
43ff13b4 JM |
1004 | /* Asynchronous version of wait_for_inferior. It is called by the |
1005 | event loop whenever a change of state is detected on the file | |
1006 | descriptor corresponding to the target. It can be called more than | |
1007 | once to complete a single execution command. In such cases we need | |
1008 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1009 | last time that this function is called for a single execution | |
1010 | command, then report to the user that the inferior has stopped, and | |
1011 | do the necessary cleanups. */ | |
1012 | ||
1013 | struct execution_control_state async_ecss; | |
1014 | struct execution_control_state *async_ecs; | |
1015 | ||
1016 | void | |
fba45db2 | 1017 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1018 | { |
1019 | static struct cleanup *old_cleanups; | |
1020 | ||
c5aa993b | 1021 | async_ecs = &async_ecss; |
43ff13b4 JM |
1022 | |
1023 | if (!async_ecs->wait_some_more) | |
1024 | { | |
488f131b | 1025 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1026 | &step_resume_breakpoint); |
43ff13b4 JM |
1027 | |
1028 | /* Fill in with reasonable starting values. */ | |
1029 | init_execution_control_state (async_ecs); | |
1030 | ||
43ff13b4 | 1031 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1032 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1033 | |
1034 | overlay_cache_invalid = 1; | |
1035 | ||
1036 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1037 | because they can be loaded from the target while in target_wait. |
1038 | This makes remote debugging a bit more efficient for those | |
1039 | targets that provide critical registers as part of their normal | |
1040 | status mechanism. */ | |
43ff13b4 JM |
1041 | |
1042 | registers_changed (); | |
1043 | } | |
1044 | ||
9a4105ab | 1045 | if (deprecated_target_wait_hook) |
488f131b | 1046 | async_ecs->ptid = |
9a4105ab | 1047 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1048 | else |
39f77062 | 1049 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1050 | |
1051 | /* Now figure out what to do with the result of the result. */ | |
1052 | handle_inferior_event (async_ecs); | |
1053 | ||
1054 | if (!async_ecs->wait_some_more) | |
1055 | { | |
adf40b2e | 1056 | /* Do only the cleanups that have been added by this |
488f131b JB |
1057 | function. Let the continuations for the commands do the rest, |
1058 | if there are any. */ | |
43ff13b4 JM |
1059 | do_exec_cleanups (old_cleanups); |
1060 | normal_stop (); | |
c2d11a7d JM |
1061 | if (step_multi && stop_step) |
1062 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1063 | else | |
1064 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1065 | } |
1066 | } | |
1067 | ||
cd0fc7c3 SS |
1068 | /* Prepare an execution control state for looping through a |
1069 | wait_for_inferior-type loop. */ | |
1070 | ||
1071 | void | |
96baa820 | 1072 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1073 | { |
c2d11a7d | 1074 | /* ecs->another_trap? */ |
cd0fc7c3 | 1075 | ecs->random_signal = 0; |
68f53502 | 1076 | ecs->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 | 1077 | ecs->handling_longjmp = 0; /* FIXME */ |
cd0fc7c3 SS |
1078 | ecs->stepping_through_solib_after_catch = 0; |
1079 | ecs->stepping_through_solib_catchpoints = NULL; | |
1080 | ecs->enable_hw_watchpoints_after_wait = 0; | |
cd0fc7c3 SS |
1081 | ecs->sal = find_pc_line (prev_pc, 0); |
1082 | ecs->current_line = ecs->sal.line; | |
1083 | ecs->current_symtab = ecs->sal.symtab; | |
1084 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1085 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1086 | ecs->wp = &(ecs->ws); |
1087 | } | |
1088 | ||
e02bc4cc | 1089 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1090 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1091 | cached by handle_inferior_event(), which gets called immediately | |
1092 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1093 | |
1094 | void | |
488f131b | 1095 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1096 | { |
39f77062 | 1097 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1098 | *status = target_last_waitstatus; |
1099 | } | |
1100 | ||
dd80620e MS |
1101 | /* Switch thread contexts, maintaining "infrun state". */ |
1102 | ||
1103 | static void | |
1104 | context_switch (struct execution_control_state *ecs) | |
1105 | { | |
1106 | /* Caution: it may happen that the new thread (or the old one!) | |
1107 | is not in the thread list. In this case we must not attempt | |
1108 | to "switch context", or we run the risk that our context may | |
1109 | be lost. This may happen as a result of the target module | |
1110 | mishandling thread creation. */ | |
1111 | ||
1112 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) | |
488f131b | 1113 | { /* Perform infrun state context switch: */ |
dd80620e | 1114 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1115 | save_infrun_state (inferior_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 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1125 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1126 | &trap_expected, &step_resume_breakpoint, |
15960608 | 1127 | &step_range_start, |
aa0cd9c1 | 1128 | &step_range_end, &step_frame_id, |
dd80620e MS |
1129 | &ecs->handling_longjmp, &ecs->another_trap, |
1130 | &ecs->stepping_through_solib_after_catch, | |
1131 | &ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1132 | &ecs->current_line, &ecs->current_symtab); |
dd80620e MS |
1133 | } |
1134 | inferior_ptid = ecs->ptid; | |
1135 | } | |
1136 | ||
4fa8626c DJ |
1137 | static void |
1138 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1139 | { | |
8aad930b | 1140 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1141 | |
1142 | /* If this target does not decrement the PC after breakpoints, then | |
1143 | we have nothing to do. */ | |
1144 | if (DECR_PC_AFTER_BREAK == 0) | |
1145 | return; | |
1146 | ||
1147 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1148 | we aren't, just return. | |
9709f61c DJ |
1149 | |
1150 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
1151 | affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented | |
1152 | by software breakpoints should be handled through the normal breakpoint | |
1153 | layer. | |
8fb3e588 | 1154 | |
4fa8626c DJ |
1155 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
1156 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1157 | clear where the PC is pointing afterwards. It may not match | |
1158 | DECR_PC_AFTER_BREAK. I don't know any specific target that generates | |
1159 | these signals at breakpoints (the code has been in GDB since at least | |
1160 | 1992) so I can not guess how to handle them here. | |
8fb3e588 | 1161 | |
4fa8626c DJ |
1162 | In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS |
1163 | would have the PC after hitting a watchpoint affected by | |
1164 | DECR_PC_AFTER_BREAK. I haven't found any target with both of these set | |
1165 | in GDB history, and it seems unlikely to be correct, so | |
1166 | HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */ | |
1167 | ||
1168 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1169 | return; | |
1170 | ||
1171 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1172 | return; | |
1173 | ||
8aad930b AC |
1174 | /* Find the location where (if we've hit a breakpoint) the |
1175 | breakpoint would be. */ | |
1176 | breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK; | |
1177 | ||
1178 | if (SOFTWARE_SINGLE_STEP_P ()) | |
1179 | { | |
1180 | /* When using software single-step, a SIGTRAP can only indicate | |
8fb3e588 AC |
1181 | an inserted breakpoint. This actually makes things |
1182 | easier. */ | |
8aad930b AC |
1183 | if (singlestep_breakpoints_inserted_p) |
1184 | /* When software single stepping, the instruction at [prev_pc] | |
1185 | is never a breakpoint, but the instruction following | |
1186 | [prev_pc] (in program execution order) always is. Assume | |
1187 | that following instruction was reached and hence a software | |
1188 | breakpoint was hit. */ | |
1189 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1190 | else if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1191 | /* The inferior was free running (i.e., no single-step | |
1192 | breakpoints inserted) and it hit a software breakpoint. */ | |
1193 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1194 | } | |
1195 | else | |
1196 | { | |
1197 | /* When using hardware single-step, a SIGTRAP is reported for | |
8fb3e588 AC |
1198 | both a completed single-step and a software breakpoint. Need |
1199 | to differentiate between the two as the latter needs | |
1200 | adjusting but the former does not. */ | |
8aad930b AC |
1201 | if (currently_stepping (ecs)) |
1202 | { | |
1203 | if (prev_pc == breakpoint_pc | |
1204 | && software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1205 | /* Hardware single-stepped a software breakpoint (as | |
1206 | occures when the inferior is resumed with PC pointing | |
1207 | at not-yet-hit software breakpoint). Since the | |
1208 | breakpoint really is executed, the inferior needs to be | |
1209 | backed up to the breakpoint address. */ | |
1210 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1211 | } | |
1212 | else | |
1213 | { | |
1214 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1215 | /* The inferior was free running (i.e., no hardware | |
1216 | single-step and no possibility of a false SIGTRAP) and | |
1217 | hit a software breakpoint. */ | |
1218 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1219 | } | |
1220 | } | |
4fa8626c DJ |
1221 | } |
1222 | ||
cd0fc7c3 SS |
1223 | /* Given an execution control state that has been freshly filled in |
1224 | by an event from the inferior, figure out what it means and take | |
1225 | appropriate action. */ | |
c906108c | 1226 | |
7270d8f2 OF |
1227 | int stepped_after_stopped_by_watchpoint; |
1228 | ||
cd0fc7c3 | 1229 | void |
96baa820 | 1230 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1231 | { |
65e82032 AC |
1232 | /* NOTE: cagney/2003-03-28: If you're looking at this code and |
1233 | thinking that the variable stepped_after_stopped_by_watchpoint | |
1234 | isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT, | |
1235 | defined in the file "config/pa/nm-hppah.h", accesses the variable | |
1236 | indirectly. Mutter something rude about the HP merge. */ | |
c8edd8b4 | 1237 | int sw_single_step_trap_p = 0; |
8fb3e588 | 1238 | int stopped_by_watchpoint = -1; /* Mark as unknown. */ |
cd0fc7c3 | 1239 | |
e02bc4cc | 1240 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1241 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1242 | target_last_waitstatus = *ecs->wp; |
1243 | ||
4fa8626c DJ |
1244 | adjust_pc_after_break (ecs); |
1245 | ||
488f131b JB |
1246 | switch (ecs->infwait_state) |
1247 | { | |
1248 | case infwait_thread_hop_state: | |
527159b7 RC |
1249 | if (debug_infrun) |
1250 | printf_unfiltered ("infrun: infwait_thread_hop_state\n"); | |
488f131b JB |
1251 | /* Cancel the waiton_ptid. */ |
1252 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 AC |
1253 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1254 | is serviced in this loop, below. */ | |
1255 | if (ecs->enable_hw_watchpoints_after_wait) | |
1256 | { | |
1257 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1258 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1259 | } | |
1260 | stepped_after_stopped_by_watchpoint = 0; | |
1261 | break; | |
b83266a0 | 1262 | |
488f131b | 1263 | case infwait_normal_state: |
527159b7 RC |
1264 | if (debug_infrun) |
1265 | printf_unfiltered ("infrun: infwait_normal_state\n"); | |
488f131b JB |
1266 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1267 | is serviced in this loop, below. */ | |
1268 | if (ecs->enable_hw_watchpoints_after_wait) | |
1269 | { | |
1270 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1271 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1272 | } | |
1273 | stepped_after_stopped_by_watchpoint = 0; | |
1274 | break; | |
b83266a0 | 1275 | |
488f131b | 1276 | case infwait_nullified_state: |
527159b7 RC |
1277 | if (debug_infrun) |
1278 | printf_unfiltered ("infrun: infwait_nullified_state\n"); | |
65e82032 | 1279 | stepped_after_stopped_by_watchpoint = 0; |
488f131b | 1280 | break; |
b83266a0 | 1281 | |
488f131b | 1282 | case infwait_nonstep_watch_state: |
527159b7 RC |
1283 | if (debug_infrun) |
1284 | printf_unfiltered ("infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 1285 | insert_breakpoints (); |
c906108c | 1286 | |
488f131b JB |
1287 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1288 | handle things like signals arriving and other things happening | |
1289 | in combination correctly? */ | |
1290 | stepped_after_stopped_by_watchpoint = 1; | |
1291 | break; | |
65e82032 AC |
1292 | |
1293 | default: | |
1294 | internal_error (__FILE__, __LINE__, "bad switch"); | |
488f131b JB |
1295 | } |
1296 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1297 | |
488f131b | 1298 | flush_cached_frames (); |
c906108c | 1299 | |
488f131b | 1300 | /* If it's a new process, add it to the thread database */ |
c906108c | 1301 | |
488f131b | 1302 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
b9b5d7ea | 1303 | && !ptid_equal (ecs->ptid, minus_one_ptid) |
488f131b JB |
1304 | && !in_thread_list (ecs->ptid)); |
1305 | ||
1306 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1307 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1308 | { | |
1309 | add_thread (ecs->ptid); | |
c906108c | 1310 | |
488f131b JB |
1311 | ui_out_text (uiout, "[New "); |
1312 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1313 | ui_out_text (uiout, "]\n"); | |
488f131b | 1314 | } |
c906108c | 1315 | |
488f131b JB |
1316 | switch (ecs->ws.kind) |
1317 | { | |
1318 | case TARGET_WAITKIND_LOADED: | |
527159b7 RC |
1319 | if (debug_infrun) |
1320 | printf_unfiltered ("infrun: TARGET_WAITKIND_LOADED\n"); | |
488f131b JB |
1321 | /* Ignore gracefully during startup of the inferior, as it |
1322 | might be the shell which has just loaded some objects, | |
1323 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1324 | #ifdef SOLIB_ADD |
c0236d92 | 1325 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1326 | { |
1327 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1328 | breakpoint addresses via breakpoint_re_set. */ | |
1329 | if (breakpoints_inserted) | |
1330 | remove_breakpoints (); | |
c906108c | 1331 | |
488f131b JB |
1332 | /* Check for any newly added shared libraries if we're |
1333 | supposed to be adding them automatically. Switch | |
1334 | terminal for any messages produced by | |
1335 | breakpoint_re_set. */ | |
1336 | target_terminal_ours_for_output (); | |
aff6338a | 1337 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
1338 | stack's section table is kept up-to-date. Architectures, |
1339 | (e.g., PPC64), use the section table to perform | |
1340 | operations such as address => section name and hence | |
1341 | require the table to contain all sections (including | |
1342 | those found in shared libraries). */ | |
aff6338a | 1343 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
1344 | exec_ops to SOLIB_ADD. This is because current GDB is |
1345 | only tooled to propagate section_table changes out from | |
1346 | the "current_target" (see target_resize_to_sections), and | |
1347 | not up from the exec stratum. This, of course, isn't | |
1348 | right. "infrun.c" should only interact with the | |
1349 | exec/process stratum, instead relying on the target stack | |
1350 | to propagate relevant changes (stop, section table | |
1351 | changed, ...) up to other layers. */ | |
aff6338a | 1352 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
1353 | target_terminal_inferior (); |
1354 | ||
1355 | /* Reinsert breakpoints and continue. */ | |
1356 | if (breakpoints_inserted) | |
1357 | insert_breakpoints (); | |
1358 | } | |
c906108c | 1359 | #endif |
488f131b JB |
1360 | resume (0, TARGET_SIGNAL_0); |
1361 | prepare_to_wait (ecs); | |
1362 | return; | |
c5aa993b | 1363 | |
488f131b | 1364 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 RC |
1365 | if (debug_infrun) |
1366 | printf_unfiltered ("infrun: TARGET_WAITKIND_SPURIOUS\n"); | |
488f131b JB |
1367 | resume (0, TARGET_SIGNAL_0); |
1368 | prepare_to_wait (ecs); | |
1369 | return; | |
c5aa993b | 1370 | |
488f131b | 1371 | case TARGET_WAITKIND_EXITED: |
527159b7 RC |
1372 | if (debug_infrun) |
1373 | printf_unfiltered ("infrun: TARGET_WAITKIND_EXITED\n"); | |
488f131b JB |
1374 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1375 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1376 | ||
1377 | /* Record the exit code in the convenience variable $_exitcode, so | |
1378 | that the user can inspect this again later. */ | |
1379 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1380 | value_from_longest (builtin_type_int, | |
1381 | (LONGEST) ecs->ws.value.integer)); | |
1382 | gdb_flush (gdb_stdout); | |
1383 | target_mourn_inferior (); | |
1384 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1385 | stop_print_frame = 0; | |
1386 | stop_stepping (ecs); | |
1387 | return; | |
c5aa993b | 1388 | |
488f131b | 1389 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 RC |
1390 | if (debug_infrun) |
1391 | printf_unfiltered ("infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
488f131b JB |
1392 | stop_print_frame = 0; |
1393 | stop_signal = ecs->ws.value.sig; | |
1394 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1395 | |
488f131b JB |
1396 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1397 | reach here unless the inferior is dead. However, for years | |
1398 | target_kill() was called here, which hints that fatal signals aren't | |
1399 | really fatal on some systems. If that's true, then some changes | |
1400 | may be needed. */ | |
1401 | target_mourn_inferior (); | |
c906108c | 1402 | |
488f131b JB |
1403 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1404 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1405 | stop_stepping (ecs); | |
1406 | return; | |
c906108c | 1407 | |
488f131b JB |
1408 | /* The following are the only cases in which we keep going; |
1409 | the above cases end in a continue or goto. */ | |
1410 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1411 | case TARGET_WAITKIND_VFORKED: |
527159b7 RC |
1412 | if (debug_infrun) |
1413 | printf_unfiltered ("infrun: TARGET_WAITKIND_FORKED\n"); | |
488f131b JB |
1414 | stop_signal = TARGET_SIGNAL_TRAP; |
1415 | pending_follow.kind = ecs->ws.kind; | |
1416 | ||
8e7d2c16 DJ |
1417 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1418 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1419 | |
488f131b | 1420 | stop_pc = read_pc (); |
675bf4cb | 1421 | |
00d4360e | 1422 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1423 | |
488f131b | 1424 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1425 | |
1426 | /* If no catchpoint triggered for this, then keep going. */ | |
1427 | if (ecs->random_signal) | |
1428 | { | |
1429 | stop_signal = TARGET_SIGNAL_0; | |
1430 | keep_going (ecs); | |
1431 | return; | |
1432 | } | |
488f131b JB |
1433 | goto process_event_stop_test; |
1434 | ||
1435 | case TARGET_WAITKIND_EXECD: | |
527159b7 RC |
1436 | if (debug_infrun) |
1437 | printf_unfiltered ("infrun: TARGET_WAITKIND_EXECED\n"); | |
488f131b JB |
1438 | stop_signal = TARGET_SIGNAL_TRAP; |
1439 | ||
7d2830a3 | 1440 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
8fb3e588 AC |
1441 | target_wait function. Until then following vfork on HP/UX 10.20 |
1442 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1443 | /* Is this a target which reports multiple exec events per actual |
1444 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1445 | ignore all but the last one. Just resume the exec'r, and wait | |
1446 | for the next exec event. */ | |
1447 | if (inferior_ignoring_leading_exec_events) | |
1448 | { | |
1449 | inferior_ignoring_leading_exec_events--; | |
1450 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1451 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event. | |
1452 | parent_pid); | |
1453 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); | |
1454 | prepare_to_wait (ecs); | |
1455 | return; | |
1456 | } | |
1457 | inferior_ignoring_leading_exec_events = | |
1458 | target_reported_exec_events_per_exec_call () - 1; | |
1459 | ||
1460 | pending_follow.execd_pathname = | |
1461 | savestring (ecs->ws.value.execd_pathname, | |
1462 | strlen (ecs->ws.value.execd_pathname)); | |
1463 | ||
488f131b JB |
1464 | /* This causes the eventpoints and symbol table to be reset. Must |
1465 | do this now, before trying to determine whether to stop. */ | |
1466 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1467 | xfree (pending_follow.execd_pathname); | |
c906108c | 1468 | |
488f131b JB |
1469 | stop_pc = read_pc_pid (ecs->ptid); |
1470 | ecs->saved_inferior_ptid = inferior_ptid; | |
1471 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1472 | |
00d4360e | 1473 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1474 | |
488f131b JB |
1475 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1476 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 DJ |
1477 | |
1478 | /* If no catchpoint triggered for this, then keep going. */ | |
1479 | if (ecs->random_signal) | |
1480 | { | |
1481 | stop_signal = TARGET_SIGNAL_0; | |
1482 | keep_going (ecs); | |
1483 | return; | |
1484 | } | |
488f131b JB |
1485 | goto process_event_stop_test; |
1486 | ||
1487 | /* These syscall events are returned on HP-UX, as part of its | |
1488 | implementation of page-protection-based "hardware" watchpoints. | |
1489 | HP-UX has unfortunate interactions between page-protections and | |
1490 | some system calls. Our solution is to disable hardware watches | |
1491 | when a system call is entered, and reenable them when the syscall | |
1492 | completes. The downside of this is that we may miss the precise | |
1493 | point at which a watched piece of memory is modified. "Oh well." | |
1494 | ||
1495 | Note that we may have multiple threads running, which may each | |
1496 | enter syscalls at roughly the same time. Since we don't have a | |
1497 | good notion currently of whether a watched piece of memory is | |
1498 | thread-private, we'd best not have any page-protections active | |
1499 | when any thread is in a syscall. Thus, we only want to reenable | |
1500 | hardware watches when no threads are in a syscall. | |
1501 | ||
1502 | Also, be careful not to try to gather much state about a thread | |
1503 | that's in a syscall. It's frequently a losing proposition. */ | |
1504 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
527159b7 RC |
1505 | if (debug_infrun) |
1506 | printf_unfiltered ("infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
488f131b JB |
1507 | number_of_threads_in_syscalls++; |
1508 | if (number_of_threads_in_syscalls == 1) | |
1509 | { | |
1510 | TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1511 | } | |
1512 | resume (0, TARGET_SIGNAL_0); | |
1513 | prepare_to_wait (ecs); | |
1514 | return; | |
c906108c | 1515 | |
488f131b JB |
1516 | /* Before examining the threads further, step this thread to |
1517 | get it entirely out of the syscall. (We get notice of the | |
1518 | event when the thread is just on the verge of exiting a | |
1519 | syscall. Stepping one instruction seems to get it back | |
1520 | into user code.) | |
c906108c | 1521 | |
488f131b JB |
1522 | Note that although the logical place to reenable h/w watches |
1523 | is here, we cannot. We cannot reenable them before stepping | |
1524 | the thread (this causes the next wait on the thread to hang). | |
c4093a6a | 1525 | |
488f131b JB |
1526 | Nor can we enable them after stepping until we've done a wait. |
1527 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait | |
1528 | here, which will be serviced immediately after the target | |
1529 | is waited on. */ | |
1530 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
527159b7 RC |
1531 | if (debug_infrun) |
1532 | printf_unfiltered ("infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
488f131b JB |
1533 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
1534 | ||
1535 | if (number_of_threads_in_syscalls > 0) | |
1536 | { | |
1537 | number_of_threads_in_syscalls--; | |
1538 | ecs->enable_hw_watchpoints_after_wait = | |
1539 | (number_of_threads_in_syscalls == 0); | |
1540 | } | |
1541 | prepare_to_wait (ecs); | |
1542 | return; | |
c906108c | 1543 | |
488f131b | 1544 | case TARGET_WAITKIND_STOPPED: |
527159b7 RC |
1545 | if (debug_infrun) |
1546 | printf_unfiltered ("infrun: TARGET_WAITKIND_STOPPED\n"); | |
488f131b JB |
1547 | stop_signal = ecs->ws.value.sig; |
1548 | break; | |
c906108c | 1549 | |
488f131b JB |
1550 | /* We had an event in the inferior, but we are not interested |
1551 | in handling it at this level. The lower layers have already | |
8e7d2c16 | 1552 | done what needs to be done, if anything. |
8fb3e588 AC |
1553 | |
1554 | One of the possible circumstances for this is when the | |
1555 | inferior produces output for the console. The inferior has | |
1556 | not stopped, and we are ignoring the event. Another possible | |
1557 | circumstance is any event which the lower level knows will be | |
1558 | reported multiple times without an intervening resume. */ | |
488f131b | 1559 | case TARGET_WAITKIND_IGNORE: |
527159b7 RC |
1560 | if (debug_infrun) |
1561 | printf_unfiltered ("infrun: TARGET_WAITKIND_IGNORE\n"); | |
8e7d2c16 | 1562 | prepare_to_wait (ecs); |
488f131b JB |
1563 | return; |
1564 | } | |
c906108c | 1565 | |
488f131b JB |
1566 | /* We may want to consider not doing a resume here in order to give |
1567 | the user a chance to play with the new thread. It might be good | |
1568 | to make that a user-settable option. */ | |
c906108c | 1569 | |
488f131b JB |
1570 | /* At this point, all threads are stopped (happens automatically in |
1571 | either the OS or the native code). Therefore we need to continue | |
1572 | all threads in order to make progress. */ | |
1573 | if (ecs->new_thread_event) | |
1574 | { | |
1575 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1576 | prepare_to_wait (ecs); | |
1577 | return; | |
1578 | } | |
c906108c | 1579 | |
488f131b JB |
1580 | stop_pc = read_pc_pid (ecs->ptid); |
1581 | ||
527159b7 RC |
1582 | if (debug_infrun) |
1583 | printf_unfiltered ("infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc)); | |
1584 | ||
9f976b41 DJ |
1585 | if (stepping_past_singlestep_breakpoint) |
1586 | { | |
8fb3e588 AC |
1587 | gdb_assert (SOFTWARE_SINGLE_STEP_P () |
1588 | && singlestep_breakpoints_inserted_p); | |
9f976b41 DJ |
1589 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
1590 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1591 | ||
1592 | stepping_past_singlestep_breakpoint = 0; | |
1593 | ||
1594 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
1595 | breakpoint, or stopped for some other reason. It would be nice if |
1596 | we could tell, but we can't reliably. */ | |
9f976b41 | 1597 | if (stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 1598 | { |
527159b7 RC |
1599 | if (debug_infrun) |
1600 | printf_unfiltered ("infrun: stepping_past_singlestep_breakpoint\n"); | |
9f976b41 DJ |
1601 | /* Pull the single step breakpoints out of the target. */ |
1602 | SOFTWARE_SINGLE_STEP (0, 0); | |
1603 | singlestep_breakpoints_inserted_p = 0; | |
1604 | ||
1605 | ecs->random_signal = 0; | |
1606 | ||
1607 | ecs->ptid = saved_singlestep_ptid; | |
1608 | context_switch (ecs); | |
9a4105ab AC |
1609 | if (deprecated_context_hook) |
1610 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1611 | |
1612 | resume (1, TARGET_SIGNAL_0); | |
1613 | prepare_to_wait (ecs); | |
1614 | return; | |
1615 | } | |
1616 | } | |
1617 | ||
1618 | stepping_past_singlestep_breakpoint = 0; | |
1619 | ||
488f131b JB |
1620 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1621 | another thread. If so, then step that thread past the breakpoint, | |
1622 | and continue it. */ | |
1623 | ||
1624 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1625 | { | |
9f976b41 DJ |
1626 | int thread_hop_needed = 0; |
1627 | ||
f8d40ec8 JB |
1628 | /* Check if a regular breakpoint has been hit before checking |
1629 | for a potential single step breakpoint. Otherwise, GDB will | |
1630 | not see this breakpoint hit when stepping onto breakpoints. */ | |
4fa8626c | 1631 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
488f131b | 1632 | { |
c5aa993b | 1633 | ecs->random_signal = 0; |
4fa8626c | 1634 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1635 | thread_hop_needed = 1; |
1636 | } | |
1637 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1638 | { | |
1639 | ecs->random_signal = 0; | |
1640 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1641 | change when we go from single-threaded to multi-threaded. If | |
1642 | the singlestep_ptid is still in the list, assume that it is | |
1643 | really different from ecs->ptid. */ | |
1644 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1645 | && in_thread_list (singlestep_ptid)) | |
1646 | { | |
1647 | thread_hop_needed = 1; | |
1648 | stepping_past_singlestep_breakpoint = 1; | |
1649 | saved_singlestep_ptid = singlestep_ptid; | |
1650 | } | |
1651 | } | |
1652 | ||
1653 | if (thread_hop_needed) | |
8fb3e588 AC |
1654 | { |
1655 | int remove_status; | |
1656 | ||
527159b7 RC |
1657 | if (debug_infrun) |
1658 | printf_unfiltered ("infrun: thread_hop_needed\n"); | |
1659 | ||
8fb3e588 AC |
1660 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1661 | Just continue. */ | |
1662 | ||
1663 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
488f131b | 1664 | { |
8fb3e588 AC |
1665 | /* Pull the single step breakpoints out of the target. */ |
1666 | SOFTWARE_SINGLE_STEP (0, 0); | |
1667 | singlestep_breakpoints_inserted_p = 0; | |
1668 | } | |
1669 | ||
1670 | remove_status = remove_breakpoints (); | |
1671 | /* Did we fail to remove breakpoints? If so, try | |
1672 | to set the PC past the bp. (There's at least | |
1673 | one situation in which we can fail to remove | |
1674 | the bp's: On HP-UX's that use ttrace, we can't | |
1675 | change the address space of a vforking child | |
1676 | process until the child exits (well, okay, not | |
1677 | then either :-) or execs. */ | |
1678 | if (remove_status != 0) | |
1679 | { | |
1680 | /* FIXME! This is obviously non-portable! */ | |
1681 | write_pc_pid (stop_pc + 4, ecs->ptid); | |
1682 | /* We need to restart all the threads now, | |
1683 | * unles we're running in scheduler-locked mode. | |
1684 | * Use currently_stepping to determine whether to | |
1685 | * step or continue. | |
1686 | */ | |
1687 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1688 | if (scheduler_mode == schedlock_on) | |
1689 | target_resume (ecs->ptid, | |
1690 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
488f131b | 1691 | else |
8fb3e588 AC |
1692 | target_resume (RESUME_ALL, |
1693 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1694 | prepare_to_wait (ecs); | |
1695 | return; | |
1696 | } | |
1697 | else | |
1698 | { /* Single step */ | |
1699 | breakpoints_inserted = 0; | |
1700 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1701 | context_switch (ecs); | |
1702 | ecs->waiton_ptid = ecs->ptid; | |
1703 | ecs->wp = &(ecs->ws); | |
1704 | ecs->another_trap = 1; | |
1705 | ||
1706 | ecs->infwait_state = infwait_thread_hop_state; | |
1707 | keep_going (ecs); | |
1708 | registers_changed (); | |
1709 | return; | |
1710 | } | |
488f131b | 1711 | } |
f8d40ec8 | 1712 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
1713 | { |
1714 | sw_single_step_trap_p = 1; | |
1715 | ecs->random_signal = 0; | |
1716 | } | |
488f131b JB |
1717 | } |
1718 | else | |
1719 | ecs->random_signal = 1; | |
c906108c | 1720 | |
488f131b | 1721 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1722 | so, then switch to that thread. */ |
1723 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1724 | { |
527159b7 RC |
1725 | if (debug_infrun) |
1726 | printf_unfiltered ("infrun: context switch\n"); | |
1727 | ||
488f131b | 1728 | context_switch (ecs); |
c5aa993b | 1729 | |
9a4105ab AC |
1730 | if (deprecated_context_hook) |
1731 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
c5aa993b | 1732 | |
488f131b JB |
1733 | flush_cached_frames (); |
1734 | } | |
c906108c | 1735 | |
488f131b JB |
1736 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1737 | { | |
1738 | /* Pull the single step breakpoints out of the target. */ | |
1739 | SOFTWARE_SINGLE_STEP (0, 0); | |
1740 | singlestep_breakpoints_inserted_p = 0; | |
1741 | } | |
c906108c | 1742 | |
488f131b JB |
1743 | /* If PC is pointing at a nullified instruction, then step beyond |
1744 | it so that the user won't be confused when GDB appears to be ready | |
1745 | to execute it. */ | |
c906108c | 1746 | |
488f131b JB |
1747 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1748 | if (INSTRUCTION_NULLIFIED) | |
1749 | { | |
527159b7 RC |
1750 | if (debug_infrun) |
1751 | printf_unfiltered ("infrun: INSTRUCTION_NULLIFIED\n"); | |
488f131b JB |
1752 | registers_changed (); |
1753 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
c906108c | 1754 | |
488f131b JB |
1755 | /* We may have received a signal that we want to pass to |
1756 | the inferior; therefore, we must not clobber the waitstatus | |
1757 | in WS. */ | |
c906108c | 1758 | |
488f131b JB |
1759 | ecs->infwait_state = infwait_nullified_state; |
1760 | ecs->waiton_ptid = ecs->ptid; | |
1761 | ecs->wp = &(ecs->tmpstatus); | |
1762 | prepare_to_wait (ecs); | |
1763 | return; | |
1764 | } | |
c906108c | 1765 | |
488f131b JB |
1766 | /* It may not be necessary to disable the watchpoint to stop over |
1767 | it. For example, the PA can (with some kernel cooperation) | |
1768 | single step over a watchpoint without disabling the watchpoint. */ | |
1769 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1770 | { | |
527159b7 RC |
1771 | if (debug_infrun) |
1772 | printf_unfiltered ("infrun: STOPPED_BY_WATCHPOINT\n"); | |
488f131b JB |
1773 | resume (1, 0); |
1774 | prepare_to_wait (ecs); | |
1775 | return; | |
1776 | } | |
c906108c | 1777 | |
488f131b JB |
1778 | /* It is far more common to need to disable a watchpoint to step |
1779 | the inferior over it. FIXME. What else might a debug | |
1780 | register or page protection watchpoint scheme need here? */ | |
1781 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1782 | { | |
1783 | /* At this point, we are stopped at an instruction which has | |
1784 | attempted to write to a piece of memory under control of | |
1785 | a watchpoint. The instruction hasn't actually executed | |
1786 | yet. If we were to evaluate the watchpoint expression | |
1787 | now, we would get the old value, and therefore no change | |
1788 | would seem to have occurred. | |
1789 | ||
1790 | In order to make watchpoints work `right', we really need | |
1791 | to complete the memory write, and then evaluate the | |
1792 | watchpoint expression. The following code does that by | |
1793 | removing the watchpoint (actually, all watchpoints and | |
1794 | breakpoints), single-stepping the target, re-inserting | |
1795 | watchpoints, and then falling through to let normal | |
1796 | single-step processing handle proceed. Since this | |
1797 | includes evaluating watchpoints, things will come to a | |
1798 | stop in the correct manner. */ | |
1799 | ||
527159b7 RC |
1800 | if (debug_infrun) |
1801 | printf_unfiltered ("infrun: STOPPED_BY_WATCHPOINT\n"); | |
488f131b JB |
1802 | remove_breakpoints (); |
1803 | registers_changed (); | |
1804 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1805 | |
488f131b JB |
1806 | ecs->waiton_ptid = ecs->ptid; |
1807 | ecs->wp = &(ecs->ws); | |
1808 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1809 | prepare_to_wait (ecs); | |
1810 | return; | |
1811 | } | |
1812 | ||
1813 | /* It may be possible to simply continue after a watchpoint. */ | |
1814 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
00d4360e | 1815 | stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
488f131b JB |
1816 | |
1817 | ecs->stop_func_start = 0; | |
1818 | ecs->stop_func_end = 0; | |
1819 | ecs->stop_func_name = 0; | |
1820 | /* Don't care about return value; stop_func_start and stop_func_name | |
1821 | will both be 0 if it doesn't work. */ | |
1822 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1823 | &ecs->stop_func_start, &ecs->stop_func_end); | |
782263ab | 1824 | ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET; |
488f131b JB |
1825 | ecs->another_trap = 0; |
1826 | bpstat_clear (&stop_bpstat); | |
1827 | stop_step = 0; | |
1828 | stop_stack_dummy = 0; | |
1829 | stop_print_frame = 1; | |
1830 | ecs->random_signal = 0; | |
1831 | stopped_by_random_signal = 0; | |
1832 | breakpoints_failed = 0; | |
1833 | ||
3352ef37 AC |
1834 | if (stop_signal == TARGET_SIGNAL_TRAP |
1835 | && trap_expected | |
1836 | && gdbarch_single_step_through_delay_p (current_gdbarch) | |
1837 | && currently_stepping (ecs)) | |
1838 | { | |
1839 | /* We're trying to step of a breakpoint. Turns out that we're | |
1840 | also on an instruction that needs to be stepped multiple | |
1841 | times before it's been fully executing. E.g., architectures | |
1842 | with a delay slot. It needs to be stepped twice, once for | |
1843 | the instruction and once for the delay slot. */ | |
1844 | int step_through_delay | |
1845 | = gdbarch_single_step_through_delay (current_gdbarch, | |
1846 | get_current_frame ()); | |
527159b7 RC |
1847 | if (debug_infrun && step_through_delay) |
1848 | printf_unfiltered ("infrun: step through delay\n"); | |
3352ef37 AC |
1849 | if (step_range_end == 0 && step_through_delay) |
1850 | { | |
1851 | /* The user issued a continue when stopped at a breakpoint. | |
1852 | Set up for another trap and get out of here. */ | |
1853 | ecs->another_trap = 1; | |
1854 | keep_going (ecs); | |
1855 | return; | |
1856 | } | |
1857 | else if (step_through_delay) | |
1858 | { | |
1859 | /* The user issued a step when stopped at a breakpoint. | |
1860 | Maybe we should stop, maybe we should not - the delay | |
1861 | slot *might* correspond to a line of source. In any | |
1862 | case, don't decide that here, just set ecs->another_trap, | |
1863 | making sure we single-step again before breakpoints are | |
1864 | re-inserted. */ | |
1865 | ecs->another_trap = 1; | |
1866 | } | |
1867 | } | |
1868 | ||
488f131b JB |
1869 | /* Look at the cause of the stop, and decide what to do. |
1870 | The alternatives are: | |
1871 | 1) break; to really stop and return to the debugger, | |
1872 | 2) drop through to start up again | |
1873 | (set ecs->another_trap to 1 to single step once) | |
1874 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1875 | will be made according to the signal handling tables. */ | |
1876 | ||
1877 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1878 | that have to do with the program's own actions. Note that |
1879 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1880 | on the operating system version. Here we detect when a SIGILL or | |
1881 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1882 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1883 | when we're trying to execute a breakpoint instruction on a | |
1884 | non-executable stack. This happens for call dummy breakpoints | |
1885 | for architectures like SPARC that place call dummies on the | |
1886 | stack. */ | |
488f131b JB |
1887 | |
1888 | if (stop_signal == TARGET_SIGNAL_TRAP | |
8fb3e588 AC |
1889 | || (breakpoints_inserted |
1890 | && (stop_signal == TARGET_SIGNAL_ILL | |
1891 | || stop_signal == TARGET_SIGNAL_SEGV | |
1892 | || stop_signal == TARGET_SIGNAL_EMT)) | |
1893 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1894 | { |
1895 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1896 | { | |
527159b7 RC |
1897 | if (debug_infrun) |
1898 | printf_unfiltered ("infrun: stopped\n"); | |
488f131b JB |
1899 | stop_print_frame = 0; |
1900 | stop_stepping (ecs); | |
1901 | return; | |
1902 | } | |
c54cfec8 EZ |
1903 | |
1904 | /* This is originated from start_remote(), start_inferior() and | |
1905 | shared libraries hook functions. */ | |
c0236d92 | 1906 | if (stop_soon == STOP_QUIETLY) |
488f131b | 1907 | { |
527159b7 RC |
1908 | if (debug_infrun) |
1909 | printf_unfiltered ("infrun: quietly stopped\n"); | |
488f131b JB |
1910 | stop_stepping (ecs); |
1911 | return; | |
1912 | } | |
1913 | ||
c54cfec8 EZ |
1914 | /* This originates from attach_command(). We need to overwrite |
1915 | the stop_signal here, because some kernels don't ignore a | |
1916 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1917 | See more comments in inferior.h. */ | |
c0236d92 | 1918 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1919 | { |
1920 | stop_stepping (ecs); | |
1921 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1922 | stop_signal = TARGET_SIGNAL_0; | |
1923 | return; | |
1924 | } | |
1925 | ||
d303a6c7 AC |
1926 | /* Don't even think about breakpoints if just proceeded over a |
1927 | breakpoint. */ | |
1928 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) | |
527159b7 RC |
1929 | { |
1930 | if (debug_infrun) | |
1931 | printf_unfiltered ("infrun: trap expected\n"); | |
1932 | bpstat_clear (&stop_bpstat); | |
1933 | } | |
488f131b JB |
1934 | else |
1935 | { | |
1936 | /* See if there is a breakpoint at the current PC. */ | |
8fb3e588 | 1937 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
00d4360e | 1938 | stopped_by_watchpoint); |
488f131b | 1939 | |
488f131b JB |
1940 | /* Following in case break condition called a |
1941 | function. */ | |
1942 | stop_print_frame = 1; | |
1943 | } | |
1944 | ||
73dd234f | 1945 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
1946 | at one stage in the past included checks for an inferior |
1947 | function call's call dummy's return breakpoint. The original | |
1948 | comment, that went with the test, read: | |
73dd234f | 1949 | |
8fb3e588 AC |
1950 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
1951 | another signal besides SIGTRAP, so check here as well as | |
1952 | above.'' | |
73dd234f AC |
1953 | |
1954 | If someone ever tries to get get call dummys on a | |
1955 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
1956 | with something like a SIGSEGV), then those tests might need |
1957 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 1958 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
1959 | suspect that it won't be the case. |
1960 | ||
8fb3e588 AC |
1961 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
1962 | be necessary for call dummies on a non-executable stack on | |
1963 | SPARC. */ | |
73dd234f | 1964 | |
488f131b JB |
1965 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1966 | ecs->random_signal | |
1967 | = !(bpstat_explains_signal (stop_bpstat) | |
1968 | || trap_expected | |
488f131b | 1969 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
1970 | else |
1971 | { | |
73dd234f | 1972 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
1973 | if (!ecs->random_signal) |
1974 | stop_signal = TARGET_SIGNAL_TRAP; | |
1975 | } | |
1976 | } | |
1977 | ||
1978 | /* When we reach this point, we've pretty much decided | |
1979 | that the reason for stopping must've been a random | |
1980 | (unexpected) signal. */ | |
1981 | ||
1982 | else | |
1983 | ecs->random_signal = 1; | |
488f131b | 1984 | |
04e68871 | 1985 | process_event_stop_test: |
488f131b JB |
1986 | /* For the program's own signals, act according to |
1987 | the signal handling tables. */ | |
1988 | ||
1989 | if (ecs->random_signal) | |
1990 | { | |
1991 | /* Signal not for debugging purposes. */ | |
1992 | int printed = 0; | |
1993 | ||
527159b7 RC |
1994 | if (debug_infrun) |
1995 | printf_unfiltered ("infrun: random signal %d\n", stop_signal); | |
1996 | ||
488f131b JB |
1997 | stopped_by_random_signal = 1; |
1998 | ||
1999 | if (signal_print[stop_signal]) | |
2000 | { | |
2001 | printed = 1; | |
2002 | target_terminal_ours_for_output (); | |
2003 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
2004 | } | |
2005 | if (signal_stop[stop_signal]) | |
2006 | { | |
2007 | stop_stepping (ecs); | |
2008 | return; | |
2009 | } | |
2010 | /* If not going to stop, give terminal back | |
2011 | if we took it away. */ | |
2012 | else if (printed) | |
2013 | target_terminal_inferior (); | |
2014 | ||
2015 | /* Clear the signal if it should not be passed. */ | |
2016 | if (signal_program[stop_signal] == 0) | |
2017 | stop_signal = TARGET_SIGNAL_0; | |
2018 | ||
68f53502 AC |
2019 | if (prev_pc == read_pc () |
2020 | && !breakpoints_inserted | |
2021 | && breakpoint_here_p (read_pc ()) | |
2022 | && step_resume_breakpoint == NULL) | |
2023 | { | |
2024 | /* We were just starting a new sequence, attempting to | |
2025 | single-step off of a breakpoint and expecting a SIGTRAP. | |
2026 | Intead this signal arrives. This signal will take us out | |
2027 | of the stepping range so GDB needs to remember to, when | |
2028 | the signal handler returns, resume stepping off that | |
2029 | breakpoint. */ | |
2030 | /* To simplify things, "continue" is forced to use the same | |
2031 | code paths as single-step - set a breakpoint at the | |
2032 | signal return address and then, once hit, step off that | |
2033 | breakpoint. */ | |
44cbf7b5 | 2034 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
68f53502 AC |
2035 | ecs->step_after_step_resume_breakpoint = 1; |
2036 | } | |
2037 | else if (step_range_end != 0 | |
2038 | && stop_signal != TARGET_SIGNAL_0 | |
2039 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
2040 | && frame_id_eq (get_frame_id (get_current_frame ()), | |
2041 | step_frame_id)) | |
d303a6c7 AC |
2042 | { |
2043 | /* The inferior is about to take a signal that will take it | |
2044 | out of the single step range. Set a breakpoint at the | |
2045 | current PC (which is presumably where the signal handler | |
2046 | will eventually return) and then allow the inferior to | |
2047 | run free. | |
2048 | ||
2049 | Note that this is only needed for a signal delivered | |
2050 | while in the single-step range. Nested signals aren't a | |
2051 | problem as they eventually all return. */ | |
44cbf7b5 | 2052 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
d303a6c7 | 2053 | } |
488f131b JB |
2054 | keep_going (ecs); |
2055 | return; | |
2056 | } | |
2057 | ||
2058 | /* Handle cases caused by hitting a breakpoint. */ | |
2059 | { | |
2060 | CORE_ADDR jmp_buf_pc; | |
2061 | struct bpstat_what what; | |
2062 | ||
2063 | what = bpstat_what (stop_bpstat); | |
2064 | ||
2065 | if (what.call_dummy) | |
2066 | { | |
2067 | stop_stack_dummy = 1; | |
c5aa993b | 2068 | } |
c906108c | 2069 | |
488f131b | 2070 | switch (what.main_action) |
c5aa993b | 2071 | { |
488f131b JB |
2072 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2073 | /* If we hit the breakpoint at longjmp, disable it for the | |
2074 | duration of this command. Then, install a temporary | |
2075 | breakpoint at the target of the jmp_buf. */ | |
527159b7 RC |
2076 | if (debug_infrun) |
2077 | printf_unfiltered ("infrun: BPSTATE_WHAT_SET_LONGJMP_RESUME\n"); | |
488f131b JB |
2078 | disable_longjmp_breakpoint (); |
2079 | remove_breakpoints (); | |
2080 | breakpoints_inserted = 0; | |
2081 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 2082 | { |
488f131b | 2083 | keep_going (ecs); |
104c1213 | 2084 | return; |
c5aa993b | 2085 | } |
488f131b JB |
2086 | |
2087 | /* Need to blow away step-resume breakpoint, as it | |
2088 | interferes with us */ | |
2089 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2090 | { |
488f131b | 2091 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2092 | } |
c906108c | 2093 | |
8fb3e588 | 2094 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2095 | ecs->handling_longjmp = 1; /* FIXME */ |
2096 | keep_going (ecs); | |
2097 | return; | |
c906108c | 2098 | |
488f131b JB |
2099 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2100 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
527159b7 RC |
2101 | if (debug_infrun) |
2102 | printf_unfiltered ("infrun: BPSTATE_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
488f131b JB |
2103 | remove_breakpoints (); |
2104 | breakpoints_inserted = 0; | |
488f131b JB |
2105 | disable_longjmp_breakpoint (); |
2106 | ecs->handling_longjmp = 0; /* FIXME */ | |
2107 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2108 | break; | |
2109 | /* else fallthrough */ | |
2110 | ||
2111 | case BPSTAT_WHAT_SINGLE: | |
527159b7 RC |
2112 | if (debug_infrun) |
2113 | printf_unfiltered ("infrun: BPSTATE_WHAT_SINGLE\n"); | |
488f131b | 2114 | if (breakpoints_inserted) |
c5aa993b | 2115 | { |
488f131b | 2116 | remove_breakpoints (); |
c5aa993b | 2117 | } |
488f131b JB |
2118 | breakpoints_inserted = 0; |
2119 | ecs->another_trap = 1; | |
2120 | /* Still need to check other stuff, at least the case | |
2121 | where we are stepping and step out of the right range. */ | |
2122 | break; | |
c906108c | 2123 | |
488f131b | 2124 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 RC |
2125 | if (debug_infrun) |
2126 | printf_unfiltered ("infrun: BPSTATE_WHAT_STOP_NOISY\n"); | |
488f131b | 2127 | stop_print_frame = 1; |
c906108c | 2128 | |
d303a6c7 AC |
2129 | /* We are about to nuke the step_resume_breakpointt via the |
2130 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2131 | |
488f131b JB |
2132 | stop_stepping (ecs); |
2133 | return; | |
c5aa993b | 2134 | |
488f131b | 2135 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 RC |
2136 | if (debug_infrun) |
2137 | printf_unfiltered ("infrun: BPSTATE_WHAT_STOP_SILENT\n"); | |
488f131b | 2138 | stop_print_frame = 0; |
c5aa993b | 2139 | |
d303a6c7 AC |
2140 | /* We are about to nuke the step_resume_breakpoin via the |
2141 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2142 | |
488f131b | 2143 | stop_stepping (ecs); |
e441088d | 2144 | return; |
c5aa993b | 2145 | |
488f131b JB |
2146 | case BPSTAT_WHAT_STEP_RESUME: |
2147 | /* This proably demands a more elegant solution, but, yeah | |
2148 | right... | |
c5aa993b | 2149 | |
488f131b JB |
2150 | This function's use of the simple variable |
2151 | step_resume_breakpoint doesn't seem to accomodate | |
2152 | simultaneously active step-resume bp's, although the | |
2153 | breakpoint list certainly can. | |
c5aa993b | 2154 | |
488f131b JB |
2155 | If we reach here and step_resume_breakpoint is already |
2156 | NULL, then apparently we have multiple active | |
2157 | step-resume bp's. We'll just delete the breakpoint we | |
2158 | stopped at, and carry on. | |
2159 | ||
2160 | Correction: what the code currently does is delete a | |
2161 | step-resume bp, but it makes no effort to ensure that | |
2162 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2163 | |
527159b7 RC |
2164 | if (debug_infrun) |
2165 | printf_unfiltered ("infrun: BPSTATE_WHAT_STEP_RESUME\n"); | |
2166 | ||
488f131b JB |
2167 | if (step_resume_breakpoint == NULL) |
2168 | { | |
2169 | step_resume_breakpoint = | |
2170 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2171 | } | |
2172 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
68f53502 AC |
2173 | if (ecs->step_after_step_resume_breakpoint) |
2174 | { | |
2175 | /* Back when the step-resume breakpoint was inserted, we | |
2176 | were trying to single-step off a breakpoint. Go back | |
2177 | to doing that. */ | |
2178 | ecs->step_after_step_resume_breakpoint = 0; | |
2179 | remove_breakpoints (); | |
2180 | breakpoints_inserted = 0; | |
2181 | ecs->another_trap = 1; | |
2182 | keep_going (ecs); | |
2183 | return; | |
2184 | } | |
488f131b JB |
2185 | break; |
2186 | ||
2187 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
527159b7 RC |
2188 | if (debug_infrun) |
2189 | printf_unfiltered ("infrun: BPSTATE_WHAT_THROUGH_SIGTRAMP\n"); | |
488f131b JB |
2190 | /* If were waiting for a trap, hitting the step_resume_break |
2191 | doesn't count as getting it. */ | |
2192 | if (trap_expected) | |
2193 | ecs->another_trap = 1; | |
2194 | break; | |
2195 | ||
2196 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2197 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2198 | #ifdef SOLIB_ADD | |
c906108c | 2199 | { |
527159b7 RC |
2200 | if (debug_infrun) |
2201 | printf_unfiltered ("infrun: BPSTATE_WHAT_CHECK_SHLIBS\n"); | |
488f131b JB |
2202 | /* Remove breakpoints, we eventually want to step over the |
2203 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2204 | breakpoint addresses via breakpoint_re_set. */ | |
2205 | if (breakpoints_inserted) | |
2206 | remove_breakpoints (); | |
c5aa993b | 2207 | breakpoints_inserted = 0; |
488f131b JB |
2208 | |
2209 | /* Check for any newly added shared libraries if we're | |
2210 | supposed to be adding them automatically. Switch | |
2211 | terminal for any messages produced by | |
2212 | breakpoint_re_set. */ | |
2213 | target_terminal_ours_for_output (); | |
aff6338a | 2214 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
2215 | stack's section table is kept up-to-date. Architectures, |
2216 | (e.g., PPC64), use the section table to perform | |
2217 | operations such as address => section name and hence | |
2218 | require the table to contain all sections (including | |
2219 | those found in shared libraries). */ | |
aff6338a | 2220 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
2221 | exec_ops to SOLIB_ADD. This is because current GDB is |
2222 | only tooled to propagate section_table changes out from | |
2223 | the "current_target" (see target_resize_to_sections), and | |
2224 | not up from the exec stratum. This, of course, isn't | |
2225 | right. "infrun.c" should only interact with the | |
2226 | exec/process stratum, instead relying on the target stack | |
2227 | to propagate relevant changes (stop, section table | |
2228 | changed, ...) up to other layers. */ | |
aff6338a | 2229 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
2230 | target_terminal_inferior (); |
2231 | ||
2232 | /* Try to reenable shared library breakpoints, additional | |
2233 | code segments in shared libraries might be mapped in now. */ | |
2234 | re_enable_breakpoints_in_shlibs (); | |
2235 | ||
2236 | /* If requested, stop when the dynamic linker notifies | |
2237 | gdb of events. This allows the user to get control | |
2238 | and place breakpoints in initializer routines for | |
2239 | dynamically loaded objects (among other things). */ | |
877522db | 2240 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2241 | { |
488f131b | 2242 | stop_stepping (ecs); |
d4f3574e SS |
2243 | return; |
2244 | } | |
c5aa993b | 2245 | |
488f131b JB |
2246 | /* If we stopped due to an explicit catchpoint, then the |
2247 | (see above) call to SOLIB_ADD pulled in any symbols | |
2248 | from a newly-loaded library, if appropriate. | |
2249 | ||
2250 | We do want the inferior to stop, but not where it is | |
2251 | now, which is in the dynamic linker callback. Rather, | |
2252 | we would like it stop in the user's program, just after | |
2253 | the call that caused this catchpoint to trigger. That | |
2254 | gives the user a more useful vantage from which to | |
2255 | examine their program's state. */ | |
8fb3e588 AC |
2256 | else if (what.main_action |
2257 | == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2258 | { |
488f131b JB |
2259 | /* ??rehrauer: If I could figure out how to get the |
2260 | right return PC from here, we could just set a temp | |
2261 | breakpoint and resume. I'm not sure we can without | |
2262 | cracking open the dld's shared libraries and sniffing | |
2263 | their unwind tables and text/data ranges, and that's | |
2264 | not a terribly portable notion. | |
2265 | ||
2266 | Until that time, we must step the inferior out of the | |
2267 | dld callback, and also out of the dld itself (and any | |
2268 | code or stubs in libdld.sl, such as "shl_load" and | |
2269 | friends) until we reach non-dld code. At that point, | |
2270 | we can stop stepping. */ | |
2271 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2272 | &ecs-> | |
2273 | stepping_through_solib_catchpoints); | |
2274 | ecs->stepping_through_solib_after_catch = 1; | |
2275 | ||
2276 | /* Be sure to lift all breakpoints, so the inferior does | |
2277 | actually step past this point... */ | |
2278 | ecs->another_trap = 1; | |
2279 | break; | |
c906108c | 2280 | } |
c5aa993b | 2281 | else |
c5aa993b | 2282 | { |
488f131b | 2283 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2284 | ecs->another_trap = 1; |
488f131b | 2285 | break; |
c5aa993b | 2286 | } |
488f131b JB |
2287 | } |
2288 | #endif | |
2289 | break; | |
c906108c | 2290 | |
488f131b JB |
2291 | case BPSTAT_WHAT_LAST: |
2292 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2293 | |
488f131b JB |
2294 | case BPSTAT_WHAT_KEEP_CHECKING: |
2295 | break; | |
2296 | } | |
2297 | } | |
c906108c | 2298 | |
488f131b JB |
2299 | /* We come here if we hit a breakpoint but should not |
2300 | stop for it. Possibly we also were stepping | |
2301 | and should stop for that. So fall through and | |
2302 | test for stepping. But, if not stepping, | |
2303 | do not stop. */ | |
c906108c | 2304 | |
488f131b JB |
2305 | /* Are we stepping to get the inferior out of the dynamic |
2306 | linker's hook (and possibly the dld itself) after catching | |
2307 | a shlib event? */ | |
2308 | if (ecs->stepping_through_solib_after_catch) | |
2309 | { | |
2310 | #if defined(SOLIB_ADD) | |
2311 | /* Have we reached our destination? If not, keep going. */ | |
2312 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2313 | { | |
527159b7 RC |
2314 | if (debug_infrun) |
2315 | printf_unfiltered ("infrun: stepping in dynamic linker\n"); | |
488f131b JB |
2316 | ecs->another_trap = 1; |
2317 | keep_going (ecs); | |
104c1213 | 2318 | return; |
488f131b JB |
2319 | } |
2320 | #endif | |
527159b7 RC |
2321 | if (debug_infrun) |
2322 | printf_unfiltered ("infrun: step past dynamic linker\n"); | |
488f131b JB |
2323 | /* Else, stop and report the catchpoint(s) whose triggering |
2324 | caused us to begin stepping. */ | |
2325 | ecs->stepping_through_solib_after_catch = 0; | |
2326 | bpstat_clear (&stop_bpstat); | |
2327 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2328 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2329 | stop_print_frame = 1; | |
2330 | stop_stepping (ecs); | |
2331 | return; | |
2332 | } | |
c906108c | 2333 | |
488f131b JB |
2334 | if (step_resume_breakpoint) |
2335 | { | |
527159b7 RC |
2336 | if (debug_infrun) |
2337 | printf_unfiltered ("infrun: step-resume breakpoint\n"); | |
2338 | ||
488f131b JB |
2339 | /* Having a step-resume breakpoint overrides anything |
2340 | else having to do with stepping commands until | |
2341 | that breakpoint is reached. */ | |
488f131b JB |
2342 | keep_going (ecs); |
2343 | return; | |
2344 | } | |
c5aa993b | 2345 | |
488f131b JB |
2346 | if (step_range_end == 0) |
2347 | { | |
527159b7 RC |
2348 | if (debug_infrun) |
2349 | printf_unfiltered ("infrun: no stepping, continue\n"); | |
488f131b | 2350 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
2351 | keep_going (ecs); |
2352 | return; | |
2353 | } | |
c5aa993b | 2354 | |
488f131b | 2355 | /* If stepping through a line, keep going if still within it. |
c906108c | 2356 | |
488f131b JB |
2357 | Note that step_range_end is the address of the first instruction |
2358 | beyond the step range, and NOT the address of the last instruction | |
2359 | within it! */ | |
2360 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2361 | { | |
527159b7 RC |
2362 | if (debug_infrun) |
2363 | printf_unfiltered ("infrun: stepping inside range [0x%s-0x%s]\n", | |
2364 | paddr_nz (step_range_start), | |
2365 | paddr_nz (step_range_end)); | |
488f131b JB |
2366 | keep_going (ecs); |
2367 | return; | |
2368 | } | |
c5aa993b | 2369 | |
488f131b | 2370 | /* We stepped out of the stepping range. */ |
c906108c | 2371 | |
488f131b JB |
2372 | /* If we are stepping at the source level and entered the runtime |
2373 | loader dynamic symbol resolution code, we keep on single stepping | |
2374 | until we exit the run time loader code and reach the callee's | |
2375 | address. */ | |
2376 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2377 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2378 | { | |
4c8c40e6 MK |
2379 | CORE_ADDR pc_after_resolver = |
2380 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2381 | |
527159b7 RC |
2382 | if (debug_infrun) |
2383 | printf_unfiltered ("infrun: stepped into dynsym resolve code\n"); | |
2384 | ||
488f131b JB |
2385 | if (pc_after_resolver) |
2386 | { | |
2387 | /* Set up a step-resume breakpoint at the address | |
2388 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2389 | struct symtab_and_line sr_sal; | |
fe39c653 | 2390 | init_sal (&sr_sal); |
488f131b JB |
2391 | sr_sal.pc = pc_after_resolver; |
2392 | ||
44cbf7b5 | 2393 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c5aa993b | 2394 | } |
c906108c | 2395 | |
488f131b JB |
2396 | keep_going (ecs); |
2397 | return; | |
2398 | } | |
c906108c | 2399 | |
42edda50 AC |
2400 | if (step_range_end != 1 |
2401 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2402 | || step_over_calls == STEP_OVER_ALL) | |
2403 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 2404 | { |
527159b7 RC |
2405 | if (debug_infrun) |
2406 | printf_unfiltered ("infrun: stepped into signal trampoline\n"); | |
42edda50 | 2407 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
2408 | a signal trampoline (either by a signal being delivered or by |
2409 | the signal handler returning). Just single-step until the | |
2410 | inferior leaves the trampoline (either by calling the handler | |
2411 | or returning). */ | |
488f131b JB |
2412 | keep_going (ecs); |
2413 | return; | |
2414 | } | |
c906108c | 2415 | |
8fb3e588 | 2416 | if (frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) |
488f131b JB |
2417 | { |
2418 | /* It's a subroutine call. */ | |
95918acb | 2419 | CORE_ADDR real_stop_pc; |
8fb3e588 | 2420 | |
527159b7 RC |
2421 | if (debug_infrun) |
2422 | printf_unfiltered ("infrun: stepped into subroutine\n"); | |
2423 | ||
95918acb AC |
2424 | if ((step_over_calls == STEP_OVER_NONE) |
2425 | || ((step_range_end == 1) | |
2426 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2427 | { | |
2428 | /* I presume that step_over_calls is only 0 when we're | |
2429 | supposed to be stepping at the assembly language level | |
2430 | ("stepi"). Just stop. */ | |
2431 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
2432 | thought it was a subroutine call but it was not. Stop as | |
2433 | well. FENN */ | |
2434 | stop_step = 1; | |
2435 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2436 | stop_stepping (ecs); | |
2437 | return; | |
2438 | } | |
8fb3e588 | 2439 | |
8567c30f AC |
2440 | if (step_over_calls == STEP_OVER_ALL) |
2441 | { | |
2442 | /* We're doing a "next", set a breakpoint at callee's return | |
2443 | address (the address at which the caller will | |
2444 | resume). */ | |
44cbf7b5 | 2445 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
8567c30f AC |
2446 | keep_going (ecs); |
2447 | return; | |
2448 | } | |
a53c66de | 2449 | |
95918acb | 2450 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
2451 | calling routine and the real function), locate the real |
2452 | function. That's what tells us (a) whether we want to step | |
2453 | into it at all, and (b) what prologue we want to run to the | |
2454 | end of, if we do step into it. */ | |
95918acb AC |
2455 | real_stop_pc = skip_language_trampoline (stop_pc); |
2456 | if (real_stop_pc == 0) | |
2457 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2458 | if (real_stop_pc != 0) | |
2459 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 2460 | |
1b2bfbb9 RC |
2461 | if (IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start)) |
2462 | { | |
2463 | struct symtab_and_line sr_sal; | |
2464 | init_sal (&sr_sal); | |
2465 | sr_sal.pc = ecs->stop_func_start; | |
2466 | ||
44cbf7b5 | 2467 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
8fb3e588 AC |
2468 | keep_going (ecs); |
2469 | return; | |
1b2bfbb9 RC |
2470 | } |
2471 | ||
95918acb | 2472 | /* If we have line number information for the function we are |
8fb3e588 | 2473 | thinking of stepping into, step into it. |
95918acb | 2474 | |
8fb3e588 AC |
2475 | If there are several symtabs at that PC (e.g. with include |
2476 | files), just want to know whether *any* of them have line | |
2477 | numbers. find_pc_line handles this. */ | |
95918acb AC |
2478 | { |
2479 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 2480 | |
95918acb AC |
2481 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2482 | if (tmp_sal.line != 0) | |
2483 | { | |
2484 | step_into_function (ecs); | |
2485 | return; | |
2486 | } | |
2487 | } | |
2488 | ||
2489 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
2490 | set, we stop the step so that the user has a chance to switch |
2491 | in assembly mode. */ | |
95918acb AC |
2492 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
2493 | { | |
2494 | stop_step = 1; | |
2495 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2496 | stop_stepping (ecs); | |
2497 | return; | |
2498 | } | |
2499 | ||
2500 | /* Set a breakpoint at callee's return address (the address at | |
8fb3e588 | 2501 | which the caller will resume). */ |
44cbf7b5 | 2502 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
95918acb | 2503 | keep_going (ecs); |
488f131b | 2504 | return; |
488f131b | 2505 | } |
c906108c | 2506 | |
488f131b JB |
2507 | /* If we're in the return path from a shared library trampoline, |
2508 | we want to proceed through the trampoline when stepping. */ | |
2509 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2510 | { | |
488f131b | 2511 | /* Determine where this trampoline returns. */ |
5cf4d23a | 2512 | CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
c906108c | 2513 | |
527159b7 RC |
2514 | if (debug_infrun) |
2515 | printf_unfiltered ("infrun: stepped into solib return tramp\n"); | |
2516 | ||
488f131b | 2517 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2518 | if (real_stop_pc) |
488f131b JB |
2519 | { |
2520 | /* And put the step-breakpoint there and go until there. */ | |
2521 | struct symtab_and_line sr_sal; | |
2522 | ||
fe39c653 | 2523 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2524 | sr_sal.pc = real_stop_pc; |
488f131b | 2525 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
44cbf7b5 AC |
2526 | |
2527 | /* Do not specify what the fp should be when we stop since | |
2528 | on some machines the prologue is where the new fp value | |
2529 | is established. */ | |
2530 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
c906108c | 2531 | |
488f131b JB |
2532 | /* Restart without fiddling with the step ranges or |
2533 | other state. */ | |
2534 | keep_going (ecs); | |
2535 | return; | |
2536 | } | |
2537 | } | |
c906108c | 2538 | |
1b2bfbb9 RC |
2539 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
2540 | the trampoline processing logic, however, there are some trampolines | |
2541 | that have no names, so we should do trampoline handling first. */ | |
2542 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2543 | && ecs->stop_func_name == NULL) | |
2544 | { | |
527159b7 RC |
2545 | if (debug_infrun) |
2546 | printf_unfiltered ("infrun: stepped into undebuggable function\n"); | |
2547 | ||
1b2bfbb9 RC |
2548 | /* The inferior just stepped into, or returned to, an |
2549 | undebuggable function (where there is no symbol, not even a | |
2550 | minimal symbol, corresponding to the address where the | |
2551 | inferior stopped). Since we want to skip this kind of code, | |
2552 | we keep going until the inferior returns from this | |
2553 | function. */ | |
2554 | if (step_stop_if_no_debug) | |
2555 | { | |
2556 | /* If we have no line number and the step-stop-if-no-debug | |
2557 | is set, we stop the step so that the user has a chance to | |
2558 | switch in assembly mode. */ | |
2559 | stop_step = 1; | |
2560 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2561 | stop_stepping (ecs); | |
2562 | return; | |
2563 | } | |
2564 | else | |
2565 | { | |
2566 | /* Set a breakpoint at callee's return address (the address | |
2567 | at which the caller will resume). */ | |
44cbf7b5 | 2568 | insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
1b2bfbb9 RC |
2569 | keep_going (ecs); |
2570 | return; | |
2571 | } | |
2572 | } | |
2573 | ||
2574 | if (step_range_end == 1) | |
2575 | { | |
2576 | /* It is stepi or nexti. We always want to stop stepping after | |
2577 | one instruction. */ | |
527159b7 RC |
2578 | if (debug_infrun) |
2579 | printf_unfiltered ("infrun: stepi/nexti\n"); | |
1b2bfbb9 RC |
2580 | stop_step = 1; |
2581 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2582 | stop_stepping (ecs); | |
2583 | return; | |
2584 | } | |
2585 | ||
2586 | ecs->sal = find_pc_line (stop_pc, 0); | |
2587 | ||
488f131b JB |
2588 | if (ecs->sal.line == 0) |
2589 | { | |
2590 | /* We have no line number information. That means to stop | |
2591 | stepping (does this always happen right after one instruction, | |
2592 | when we do "s" in a function with no line numbers, | |
2593 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 RC |
2594 | if (debug_infrun) |
2595 | printf_unfiltered ("infrun: no line number info\n"); | |
488f131b JB |
2596 | stop_step = 1; |
2597 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2598 | stop_stepping (ecs); | |
2599 | return; | |
2600 | } | |
c906108c | 2601 | |
488f131b JB |
2602 | if ((stop_pc == ecs->sal.pc) |
2603 | && (ecs->current_line != ecs->sal.line | |
2604 | || ecs->current_symtab != ecs->sal.symtab)) | |
2605 | { | |
2606 | /* We are at the start of a different line. So stop. Note that | |
2607 | we don't stop if we step into the middle of a different line. | |
2608 | That is said to make things like for (;;) statements work | |
2609 | better. */ | |
527159b7 RC |
2610 | if (debug_infrun) |
2611 | printf_unfiltered ("infrun: stepped to a different line\n"); | |
488f131b JB |
2612 | stop_step = 1; |
2613 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2614 | stop_stepping (ecs); | |
2615 | return; | |
2616 | } | |
c906108c | 2617 | |
488f131b | 2618 | /* We aren't done stepping. |
c906108c | 2619 | |
488f131b JB |
2620 | Optimize by setting the stepping range to the line. |
2621 | (We might not be in the original line, but if we entered a | |
2622 | new line in mid-statement, we continue stepping. This makes | |
2623 | things like for(;;) statements work better.) */ | |
c906108c | 2624 | |
488f131b | 2625 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2626 | { |
488f131b JB |
2627 | /* If this is the last line of the function, don't keep stepping |
2628 | (it would probably step us out of the function). | |
2629 | This is particularly necessary for a one-line function, | |
2630 | in which after skipping the prologue we better stop even though | |
2631 | we will be in mid-line. */ | |
527159b7 RC |
2632 | if (debug_infrun) |
2633 | printf_unfiltered ("infrun: stepped to a different function\n"); | |
488f131b JB |
2634 | stop_step = 1; |
2635 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2636 | stop_stepping (ecs); | |
2637 | return; | |
c5aa993b | 2638 | } |
488f131b JB |
2639 | step_range_start = ecs->sal.pc; |
2640 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2641 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2642 | ecs->current_line = ecs->sal.line; |
2643 | ecs->current_symtab = ecs->sal.symtab; | |
2644 | ||
aa0cd9c1 AC |
2645 | /* In the case where we just stepped out of a function into the |
2646 | middle of a line of the caller, continue stepping, but | |
2647 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2648 | #if 0 |
2649 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2650 | generous. It will trigger on things like a step into a frameless | |
2651 | stackless leaf function. I think the logic should instead look | |
2652 | at the unwound frame ID has that should give a more robust | |
2653 | indication of what happened. */ | |
8fb3e588 AC |
2654 | if (step - ID == current - ID) |
2655 | still stepping in same function; | |
2656 | else if (step - ID == unwind (current - ID)) | |
2657 | stepped into a function; | |
2658 | else | |
2659 | stepped out of a function; | |
2660 | /* Of course this assumes that the frame ID unwind code is robust | |
2661 | and we're willing to introduce frame unwind logic into this | |
2662 | function. Fortunately, those days are nearly upon us. */ | |
65815ea1 | 2663 | #endif |
488f131b | 2664 | { |
aa0cd9c1 AC |
2665 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2666 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2667 | step_frame_id = current_frame; | |
488f131b | 2668 | } |
c906108c | 2669 | |
527159b7 RC |
2670 | if (debug_infrun) |
2671 | printf_unfiltered ("infrun: keep going\n"); | |
488f131b | 2672 | keep_going (ecs); |
104c1213 JM |
2673 | } |
2674 | ||
2675 | /* Are we in the middle of stepping? */ | |
2676 | ||
2677 | static int | |
2678 | currently_stepping (struct execution_control_state *ecs) | |
2679 | { | |
d303a6c7 | 2680 | return ((!ecs->handling_longjmp |
104c1213 JM |
2681 | && ((step_range_end && step_resume_breakpoint == NULL) |
2682 | || trap_expected)) | |
2683 | || ecs->stepping_through_solib_after_catch | |
2684 | || bpstat_should_step ()); | |
2685 | } | |
c906108c | 2686 | |
c2c6d25f JM |
2687 | /* Subroutine call with source code we should not step over. Do step |
2688 | to the first line of code in it. */ | |
2689 | ||
2690 | static void | |
2691 | step_into_function (struct execution_control_state *ecs) | |
2692 | { | |
2693 | struct symtab *s; | |
2694 | struct symtab_and_line sr_sal; | |
2695 | ||
2696 | s = find_pc_symtab (stop_pc); | |
2697 | if (s && s->language != language_asm) | |
2698 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2699 | ||
2700 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2701 | /* Use the step_resume_break to step until the end of the prologue, | |
2702 | even if that involves jumps (as it seems to on the vax under | |
2703 | 4.2). */ | |
2704 | /* If the prologue ends in the middle of a source line, continue to | |
2705 | the end of that source line (if it is still within the function). | |
2706 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2707 | if (ecs->sal.end |
2708 | && ecs->sal.pc != ecs->stop_func_start | |
2709 | && ecs->sal.end < ecs->stop_func_end) | |
2710 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2711 | |
2dbd5e30 KB |
2712 | /* Architectures which require breakpoint adjustment might not be able |
2713 | to place a breakpoint at the computed address. If so, the test | |
2714 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2715 | ecs->stop_func_start to an address at which a breakpoint may be | |
2716 | legitimately placed. | |
8fb3e588 | 2717 | |
2dbd5e30 KB |
2718 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
2719 | made, GDB will enter an infinite loop when stepping through | |
2720 | optimized code consisting of VLIW instructions which contain | |
2721 | subinstructions corresponding to different source lines. On | |
2722 | FR-V, it's not permitted to place a breakpoint on any but the | |
2723 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2724 | set, GDB will adjust the breakpoint address to the beginning of | |
2725 | the VLIW instruction. Thus, we need to make the corresponding | |
2726 | adjustment here when computing the stop address. */ | |
8fb3e588 | 2727 | |
2dbd5e30 KB |
2728 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
2729 | { | |
2730 | ecs->stop_func_start | |
2731 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
8fb3e588 | 2732 | ecs->stop_func_start); |
2dbd5e30 KB |
2733 | } |
2734 | ||
c2c6d25f JM |
2735 | if (ecs->stop_func_start == stop_pc) |
2736 | { | |
2737 | /* We are already there: stop now. */ | |
2738 | stop_step = 1; | |
488f131b | 2739 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2740 | stop_stepping (ecs); |
2741 | return; | |
2742 | } | |
2743 | else | |
2744 | { | |
2745 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2746 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2747 | sr_sal.pc = ecs->stop_func_start; |
2748 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
44cbf7b5 | 2749 | |
c2c6d25f | 2750 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
2751 | some machines the prologue is where the new fp value is |
2752 | established. */ | |
44cbf7b5 | 2753 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c2c6d25f JM |
2754 | |
2755 | /* And make sure stepping stops right away then. */ | |
2756 | step_range_end = step_range_start; | |
2757 | } | |
2758 | keep_going (ecs); | |
2759 | } | |
d4f3574e | 2760 | |
44cbf7b5 AC |
2761 | /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID. |
2762 | This is used to both functions and to skip over code. */ | |
2763 | ||
2764 | static void | |
2765 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
2766 | struct frame_id sr_id) | |
2767 | { | |
2768 | /* There should never be more than one step-resume breakpoint per | |
2769 | thread, so we should never be setting a new | |
2770 | step_resume_breakpoint when one is already active. */ | |
2771 | gdb_assert (step_resume_breakpoint == NULL); | |
2772 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, | |
2773 | bp_step_resume); | |
2774 | if (breakpoints_inserted) | |
2775 | insert_breakpoints (); | |
2776 | } | |
2777 | ||
7ce450bd AC |
2778 | /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used |
2779 | to skip a function (next, skip-no-debug) or signal. It's assumed | |
2780 | that the function/signal handler being skipped eventually returns | |
2781 | to the breakpoint inserted at RETURN_FRAME.pc. | |
2782 | ||
2783 | For the skip-function case, the function may have been reached by | |
2784 | either single stepping a call / return / signal-return instruction, | |
2785 | or by hitting a breakpoint. In all cases, the RETURN_FRAME belongs | |
2786 | to the skip-function's caller. | |
2787 | ||
2788 | For the signals case, this is called with the interrupted | |
2789 | function's frame. The signal handler, when it returns, will resume | |
2790 | the interrupted function at RETURN_FRAME.pc. */ | |
d303a6c7 AC |
2791 | |
2792 | static void | |
44cbf7b5 | 2793 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
2794 | { |
2795 | struct symtab_and_line sr_sal; | |
2796 | ||
d303a6c7 AC |
2797 | init_sal (&sr_sal); /* initialize to zeros */ |
2798 | ||
7ce450bd | 2799 | sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (return_frame)); |
d303a6c7 AC |
2800 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2801 | ||
44cbf7b5 | 2802 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
d303a6c7 AC |
2803 | } |
2804 | ||
104c1213 JM |
2805 | static void |
2806 | stop_stepping (struct execution_control_state *ecs) | |
2807 | { | |
527159b7 RC |
2808 | if (debug_infrun) |
2809 | printf_unfiltered ("infrun: stop_stepping\n"); | |
2810 | ||
cd0fc7c3 SS |
2811 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2812 | ecs->wait_some_more = 0; | |
2813 | } | |
2814 | ||
d4f3574e SS |
2815 | /* This function handles various cases where we need to continue |
2816 | waiting for the inferior. */ | |
2817 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2818 | ||
2819 | static void | |
2820 | keep_going (struct execution_control_state *ecs) | |
2821 | { | |
d4f3574e | 2822 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2823 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 2824 | |
d4f3574e SS |
2825 | /* If we did not do break;, it means we should keep running the |
2826 | inferior and not return to debugger. */ | |
2827 | ||
2828 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2829 | { | |
2830 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2831 | the inferior, else we'd have done a break above) and we |
2832 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2833 | resume (currently_stepping (ecs), stop_signal); |
2834 | } | |
2835 | else | |
2836 | { | |
2837 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2838 | anyway (the user asked that this signal be passed to the |
2839 | child) | |
2840 | -- or -- | |
2841 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2842 | decided we should resume from it. | |
d4f3574e | 2843 | |
68f53502 | 2844 | We're going to run this baby now! */ |
d4f3574e | 2845 | |
68f53502 | 2846 | if (!breakpoints_inserted && !ecs->another_trap) |
d4f3574e SS |
2847 | { |
2848 | breakpoints_failed = insert_breakpoints (); | |
2849 | if (breakpoints_failed) | |
2850 | { | |
2851 | stop_stepping (ecs); | |
2852 | return; | |
2853 | } | |
2854 | breakpoints_inserted = 1; | |
2855 | } | |
2856 | ||
2857 | trap_expected = ecs->another_trap; | |
2858 | ||
2859 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2860 | specifies that such a signal should be delivered to the |
2861 | target program). | |
2862 | ||
2863 | Typically, this would occure when a user is debugging a | |
2864 | target monitor on a simulator: the target monitor sets a | |
2865 | breakpoint; the simulator encounters this break-point and | |
2866 | halts the simulation handing control to GDB; GDB, noteing | |
2867 | that the break-point isn't valid, returns control back to the | |
2868 | simulator; the simulator then delivers the hardware | |
2869 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2870 | ||
2871 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2872 | stop_signal = TARGET_SIGNAL_0; |
2873 | ||
d4f3574e SS |
2874 | |
2875 | resume (currently_stepping (ecs), stop_signal); | |
2876 | } | |
2877 | ||
488f131b | 2878 | prepare_to_wait (ecs); |
d4f3574e SS |
2879 | } |
2880 | ||
104c1213 JM |
2881 | /* This function normally comes after a resume, before |
2882 | handle_inferior_event exits. It takes care of any last bits of | |
2883 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2884 | |
104c1213 JM |
2885 | static void |
2886 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2887 | { |
527159b7 RC |
2888 | if (debug_infrun) |
2889 | printf_unfiltered ("infrun: prepare_to_wait\n"); | |
104c1213 JM |
2890 | if (ecs->infwait_state == infwait_normal_state) |
2891 | { | |
2892 | overlay_cache_invalid = 1; | |
2893 | ||
2894 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2895 | target_wait because they can be loaded from the target while |
2896 | in target_wait. This makes remote debugging a bit more | |
2897 | efficient for those targets that provide critical registers | |
2898 | as part of their normal status mechanism. */ | |
104c1213 JM |
2899 | |
2900 | registers_changed (); | |
39f77062 | 2901 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2902 | ecs->wp = &(ecs->ws); |
2903 | } | |
2904 | /* This is the old end of the while loop. Let everybody know we | |
2905 | want to wait for the inferior some more and get called again | |
2906 | soon. */ | |
2907 | ecs->wait_some_more = 1; | |
c906108c | 2908 | } |
11cf8741 JM |
2909 | |
2910 | /* Print why the inferior has stopped. We always print something when | |
2911 | the inferior exits, or receives a signal. The rest of the cases are | |
2912 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2913 | there should be a call to this function from handle_inferior_event() | |
2914 | each time stop_stepping() is called.*/ | |
2915 | static void | |
2916 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2917 | { | |
2918 | switch (stop_reason) | |
2919 | { | |
2920 | case STOP_UNKNOWN: | |
2921 | /* We don't deal with these cases from handle_inferior_event() | |
2922 | yet. */ | |
2923 | break; | |
2924 | case END_STEPPING_RANGE: | |
2925 | /* We are done with a step/next/si/ni command. */ | |
2926 | /* For now print nothing. */ | |
fb40c209 | 2927 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2928 | operation for n > 1 */ |
fb40c209 | 2929 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2930 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2931 | ui_out_field_string (uiout, "reason", "end-stepping-range"); |
11cf8741 JM |
2932 | break; |
2933 | case BREAKPOINT_HIT: | |
2934 | /* We found a breakpoint. */ | |
2935 | /* For now print nothing. */ | |
2936 | break; | |
2937 | case SIGNAL_EXITED: | |
2938 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2939 | annotate_signalled (); |
9dc5e2a9 | 2940 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2941 | ui_out_field_string (uiout, "reason", "exited-signalled"); |
8b93c638 JM |
2942 | ui_out_text (uiout, "\nProgram terminated with signal "); |
2943 | annotate_signal_name (); | |
488f131b JB |
2944 | ui_out_field_string (uiout, "signal-name", |
2945 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2946 | annotate_signal_name_end (); |
2947 | ui_out_text (uiout, ", "); | |
2948 | annotate_signal_string (); | |
488f131b JB |
2949 | ui_out_field_string (uiout, "signal-meaning", |
2950 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2951 | annotate_signal_string_end (); |
2952 | ui_out_text (uiout, ".\n"); | |
2953 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
2954 | break; |
2955 | case EXITED: | |
2956 | /* The inferior program is finished. */ | |
8b93c638 JM |
2957 | annotate_exited (stop_info); |
2958 | if (stop_info) | |
2959 | { | |
9dc5e2a9 | 2960 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2961 | ui_out_field_string (uiout, "reason", "exited"); |
8b93c638 | 2962 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
2963 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
2964 | (unsigned int) stop_info); | |
8b93c638 JM |
2965 | ui_out_text (uiout, ".\n"); |
2966 | } | |
2967 | else | |
2968 | { | |
9dc5e2a9 | 2969 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2970 | ui_out_field_string (uiout, "reason", "exited-normally"); |
8b93c638 JM |
2971 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
2972 | } | |
11cf8741 JM |
2973 | break; |
2974 | case SIGNAL_RECEIVED: | |
2975 | /* Signal received. The signal table tells us to print about | |
2976 | it. */ | |
8b93c638 JM |
2977 | annotate_signal (); |
2978 | ui_out_text (uiout, "\nProgram received signal "); | |
2979 | annotate_signal_name (); | |
84c6c83c KS |
2980 | if (ui_out_is_mi_like_p (uiout)) |
2981 | ui_out_field_string (uiout, "reason", "signal-received"); | |
488f131b JB |
2982 | ui_out_field_string (uiout, "signal-name", |
2983 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2984 | annotate_signal_name_end (); |
2985 | ui_out_text (uiout, ", "); | |
2986 | annotate_signal_string (); | |
488f131b JB |
2987 | ui_out_field_string (uiout, "signal-meaning", |
2988 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2989 | annotate_signal_string_end (); |
2990 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
2991 | break; |
2992 | default: | |
8e65ff28 AC |
2993 | internal_error (__FILE__, __LINE__, |
2994 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
2995 | break; |
2996 | } | |
2997 | } | |
c906108c | 2998 | \f |
43ff13b4 | 2999 | |
c906108c SS |
3000 | /* Here to return control to GDB when the inferior stops for real. |
3001 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3002 | ||
3003 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3004 | (pc, function, args, file, line number and line text). | |
3005 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3006 | attempting to insert breakpoints. */ | |
3007 | ||
3008 | void | |
96baa820 | 3009 | normal_stop (void) |
c906108c | 3010 | { |
73b65bb0 DJ |
3011 | struct target_waitstatus last; |
3012 | ptid_t last_ptid; | |
3013 | ||
3014 | get_last_target_status (&last_ptid, &last); | |
3015 | ||
c906108c SS |
3016 | /* As with the notification of thread events, we want to delay |
3017 | notifying the user that we've switched thread context until | |
3018 | the inferior actually stops. | |
3019 | ||
73b65bb0 DJ |
3020 | There's no point in saying anything if the inferior has exited. |
3021 | Note that SIGNALLED here means "exited with a signal", not | |
3022 | "received a signal". */ | |
488f131b | 3023 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
3024 | && target_has_execution |
3025 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
3026 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
3027 | { |
3028 | target_terminal_ours_for_output (); | |
c3f6f71d | 3029 | printf_filtered ("[Switching to %s]\n", |
39f77062 KB |
3030 | target_pid_or_tid_to_str (inferior_ptid)); |
3031 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 3032 | } |
c906108c | 3033 | |
4fa8626c | 3034 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
3035 | /* Make sure that the current_frame's pc is correct. This |
3036 | is a correction for setting up the frame info before doing | |
3037 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
3038 | if (target_has_execution) |
3039 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
3040 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
3041 | frame code to check for this and sort out any resultant mess. | |
3042 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 3043 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 3044 | |
c906108c SS |
3045 | if (target_has_execution && breakpoints_inserted) |
3046 | { | |
3047 | if (remove_breakpoints ()) | |
3048 | { | |
3049 | target_terminal_ours_for_output (); | |
3050 | printf_filtered ("Cannot remove breakpoints because "); | |
3051 | printf_filtered ("program is no longer writable.\n"); | |
3052 | printf_filtered ("It might be running in another process.\n"); | |
3053 | printf_filtered ("Further execution is probably impossible.\n"); | |
3054 | } | |
3055 | } | |
3056 | breakpoints_inserted = 0; | |
3057 | ||
3058 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3059 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3060 | ||
3061 | breakpoint_auto_delete (stop_bpstat); | |
3062 | ||
3063 | /* If an auto-display called a function and that got a signal, | |
3064 | delete that auto-display to avoid an infinite recursion. */ | |
3065 | ||
3066 | if (stopped_by_random_signal) | |
3067 | disable_current_display (); | |
3068 | ||
3069 | /* Don't print a message if in the middle of doing a "step n" | |
3070 | operation for n > 1 */ | |
3071 | if (step_multi && stop_step) | |
3072 | goto done; | |
3073 | ||
3074 | target_terminal_ours (); | |
3075 | ||
5913bcb0 AC |
3076 | /* Look up the hook_stop and run it (CLI internally handles problem |
3077 | of stop_command's pre-hook not existing). */ | |
3078 | if (stop_command) | |
3079 | catch_errors (hook_stop_stub, stop_command, | |
3080 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3081 | |
3082 | if (!target_has_stack) | |
3083 | { | |
3084 | ||
3085 | goto done; | |
3086 | } | |
3087 | ||
3088 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3089 | and current location is based on that. | |
3090 | Don't do this on return from a stack dummy routine, | |
3091 | or if the program has exited. */ | |
3092 | ||
3093 | if (!stop_stack_dummy) | |
3094 | { | |
0f7d239c | 3095 | select_frame (get_current_frame ()); |
c906108c SS |
3096 | |
3097 | /* Print current location without a level number, if | |
c5aa993b JM |
3098 | we have changed functions or hit a breakpoint. |
3099 | Print source line if we have one. | |
3100 | bpstat_print() contains the logic deciding in detail | |
3101 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3102 | |
6e7f8b9c | 3103 | if (stop_print_frame && deprecated_selected_frame) |
c906108c SS |
3104 | { |
3105 | int bpstat_ret; | |
3106 | int source_flag; | |
917317f4 | 3107 | int do_frame_printing = 1; |
c906108c SS |
3108 | |
3109 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3110 | switch (bpstat_ret) |
3111 | { | |
3112 | case PRINT_UNKNOWN: | |
aa0cd9c1 | 3113 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
3114 | (or should) carry around the function and does (or |
3115 | should) use that when doing a frame comparison. */ | |
917317f4 | 3116 | if (stop_step |
aa0cd9c1 AC |
3117 | && frame_id_eq (step_frame_id, |
3118 | get_frame_id (get_current_frame ())) | |
917317f4 | 3119 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3120 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3121 | else |
488f131b | 3122 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3123 | break; |
3124 | case PRINT_SRC_AND_LOC: | |
488f131b | 3125 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3126 | break; |
3127 | case PRINT_SRC_ONLY: | |
c5394b80 | 3128 | source_flag = SRC_LINE; |
917317f4 JM |
3129 | break; |
3130 | case PRINT_NOTHING: | |
488f131b | 3131 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3132 | do_frame_printing = 0; |
3133 | break; | |
3134 | default: | |
488f131b | 3135 | internal_error (__FILE__, __LINE__, "Unknown value."); |
917317f4 | 3136 | } |
fb40c209 | 3137 | /* For mi, have the same behavior every time we stop: |
488f131b | 3138 | print everything but the source line. */ |
9dc5e2a9 | 3139 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3140 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3141 | |
9dc5e2a9 | 3142 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3143 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3144 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3145 | /* The behavior of this routine with respect to the source |
3146 | flag is: | |
c5394b80 JM |
3147 | SRC_LINE: Print only source line |
3148 | LOCATION: Print only location | |
3149 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3150 | if (do_frame_printing) |
b04f3ab4 | 3151 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
3152 | |
3153 | /* Display the auto-display expressions. */ | |
3154 | do_displays (); | |
3155 | } | |
3156 | } | |
3157 | ||
3158 | /* Save the function value return registers, if we care. | |
3159 | We might be about to restore their previous contents. */ | |
3160 | if (proceed_to_finish) | |
72cec141 AC |
3161 | /* NB: The copy goes through to the target picking up the value of |
3162 | all the registers. */ | |
3163 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3164 | |
3165 | if (stop_stack_dummy) | |
3166 | { | |
dbe9fe58 AC |
3167 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3168 | ends with a setting of the current frame, so we can use that | |
3169 | next. */ | |
3170 | frame_pop (get_current_frame ()); | |
c906108c | 3171 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3172 | Can't rely on restore_inferior_status because that only gets |
3173 | called if we don't stop in the called function. */ | |
c906108c | 3174 | stop_pc = read_pc (); |
0f7d239c | 3175 | select_frame (get_current_frame ()); |
c906108c SS |
3176 | } |
3177 | ||
c906108c SS |
3178 | done: |
3179 | annotate_stopped (); | |
7a464420 | 3180 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3181 | } |
3182 | ||
3183 | static int | |
96baa820 | 3184 | hook_stop_stub (void *cmd) |
c906108c | 3185 | { |
5913bcb0 | 3186 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3187 | return (0); |
3188 | } | |
3189 | \f | |
c5aa993b | 3190 | int |
96baa820 | 3191 | signal_stop_state (int signo) |
c906108c SS |
3192 | { |
3193 | return signal_stop[signo]; | |
3194 | } | |
3195 | ||
c5aa993b | 3196 | int |
96baa820 | 3197 | signal_print_state (int signo) |
c906108c SS |
3198 | { |
3199 | return signal_print[signo]; | |
3200 | } | |
3201 | ||
c5aa993b | 3202 | int |
96baa820 | 3203 | signal_pass_state (int signo) |
c906108c SS |
3204 | { |
3205 | return signal_program[signo]; | |
3206 | } | |
3207 | ||
488f131b | 3208 | int |
7bda5e4a | 3209 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3210 | { |
3211 | int ret = signal_stop[signo]; | |
3212 | signal_stop[signo] = state; | |
3213 | return ret; | |
3214 | } | |
3215 | ||
488f131b | 3216 | int |
7bda5e4a | 3217 | signal_print_update (int signo, int state) |
d4f3574e SS |
3218 | { |
3219 | int ret = signal_print[signo]; | |
3220 | signal_print[signo] = state; | |
3221 | return ret; | |
3222 | } | |
3223 | ||
488f131b | 3224 | int |
7bda5e4a | 3225 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3226 | { |
3227 | int ret = signal_program[signo]; | |
3228 | signal_program[signo] = state; | |
3229 | return ret; | |
3230 | } | |
3231 | ||
c906108c | 3232 | static void |
96baa820 | 3233 | sig_print_header (void) |
c906108c SS |
3234 | { |
3235 | printf_filtered ("\ | |
3236 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3237 | } | |
3238 | ||
3239 | static void | |
96baa820 | 3240 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3241 | { |
3242 | char *name = target_signal_to_name (oursig); | |
3243 | int name_padding = 13 - strlen (name); | |
96baa820 | 3244 | |
c906108c SS |
3245 | if (name_padding <= 0) |
3246 | name_padding = 0; | |
3247 | ||
3248 | printf_filtered ("%s", name); | |
488f131b | 3249 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3250 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3251 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3252 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3253 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3254 | } | |
3255 | ||
3256 | /* Specify how various signals in the inferior should be handled. */ | |
3257 | ||
3258 | static void | |
96baa820 | 3259 | handle_command (char *args, int from_tty) |
c906108c SS |
3260 | { |
3261 | char **argv; | |
3262 | int digits, wordlen; | |
3263 | int sigfirst, signum, siglast; | |
3264 | enum target_signal oursig; | |
3265 | int allsigs; | |
3266 | int nsigs; | |
3267 | unsigned char *sigs; | |
3268 | struct cleanup *old_chain; | |
3269 | ||
3270 | if (args == NULL) | |
3271 | { | |
3272 | error_no_arg ("signal to handle"); | |
3273 | } | |
3274 | ||
3275 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3276 | ||
3277 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3278 | sigs = (unsigned char *) alloca (nsigs); | |
3279 | memset (sigs, 0, nsigs); | |
3280 | ||
3281 | /* Break the command line up into args. */ | |
3282 | ||
3283 | argv = buildargv (args); | |
3284 | if (argv == NULL) | |
3285 | { | |
3286 | nomem (0); | |
3287 | } | |
7a292a7a | 3288 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3289 | |
3290 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3291 | actions. Signal numbers and signal names may be interspersed with | |
3292 | actions, with the actions being performed for all signals cumulatively | |
3293 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3294 | ||
3295 | while (*argv != NULL) | |
3296 | { | |
3297 | wordlen = strlen (*argv); | |
3298 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3299 | {; | |
3300 | } | |
3301 | allsigs = 0; | |
3302 | sigfirst = siglast = -1; | |
3303 | ||
3304 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3305 | { | |
3306 | /* Apply action to all signals except those used by the | |
3307 | debugger. Silently skip those. */ | |
3308 | allsigs = 1; | |
3309 | sigfirst = 0; | |
3310 | siglast = nsigs - 1; | |
3311 | } | |
3312 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3313 | { | |
3314 | SET_SIGS (nsigs, sigs, signal_stop); | |
3315 | SET_SIGS (nsigs, sigs, signal_print); | |
3316 | } | |
3317 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3318 | { | |
3319 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3320 | } | |
3321 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3322 | { | |
3323 | SET_SIGS (nsigs, sigs, signal_print); | |
3324 | } | |
3325 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3326 | { | |
3327 | SET_SIGS (nsigs, sigs, signal_program); | |
3328 | } | |
3329 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3330 | { | |
3331 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3332 | } | |
3333 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3334 | { | |
3335 | SET_SIGS (nsigs, sigs, signal_program); | |
3336 | } | |
3337 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3338 | { | |
3339 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3340 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3341 | } | |
3342 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3343 | { | |
3344 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3345 | } | |
3346 | else if (digits > 0) | |
3347 | { | |
3348 | /* It is numeric. The numeric signal refers to our own | |
3349 | internal signal numbering from target.h, not to host/target | |
3350 | signal number. This is a feature; users really should be | |
3351 | using symbolic names anyway, and the common ones like | |
3352 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3353 | ||
3354 | sigfirst = siglast = (int) | |
3355 | target_signal_from_command (atoi (*argv)); | |
3356 | if ((*argv)[digits] == '-') | |
3357 | { | |
3358 | siglast = (int) | |
3359 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3360 | } | |
3361 | if (sigfirst > siglast) | |
3362 | { | |
3363 | /* Bet he didn't figure we'd think of this case... */ | |
3364 | signum = sigfirst; | |
3365 | sigfirst = siglast; | |
3366 | siglast = signum; | |
3367 | } | |
3368 | } | |
3369 | else | |
3370 | { | |
3371 | oursig = target_signal_from_name (*argv); | |
3372 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3373 | { | |
3374 | sigfirst = siglast = (int) oursig; | |
3375 | } | |
3376 | else | |
3377 | { | |
3378 | /* Not a number and not a recognized flag word => complain. */ | |
3379 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3380 | } | |
3381 | } | |
3382 | ||
3383 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3384 | which signals to apply actions to. */ |
c906108c SS |
3385 | |
3386 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3387 | { | |
3388 | switch ((enum target_signal) signum) | |
3389 | { | |
3390 | case TARGET_SIGNAL_TRAP: | |
3391 | case TARGET_SIGNAL_INT: | |
3392 | if (!allsigs && !sigs[signum]) | |
3393 | { | |
3394 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3395 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3396 | { |
3397 | sigs[signum] = 1; | |
3398 | } | |
3399 | else | |
3400 | { | |
3401 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3402 | gdb_flush (gdb_stdout); | |
3403 | } | |
3404 | } | |
3405 | break; | |
3406 | case TARGET_SIGNAL_0: | |
3407 | case TARGET_SIGNAL_DEFAULT: | |
3408 | case TARGET_SIGNAL_UNKNOWN: | |
3409 | /* Make sure that "all" doesn't print these. */ | |
3410 | break; | |
3411 | default: | |
3412 | sigs[signum] = 1; | |
3413 | break; | |
3414 | } | |
3415 | } | |
3416 | ||
3417 | argv++; | |
3418 | } | |
3419 | ||
39f77062 | 3420 | target_notice_signals (inferior_ptid); |
c906108c SS |
3421 | |
3422 | if (from_tty) | |
3423 | { | |
3424 | /* Show the results. */ | |
3425 | sig_print_header (); | |
3426 | for (signum = 0; signum < nsigs; signum++) | |
3427 | { | |
3428 | if (sigs[signum]) | |
3429 | { | |
3430 | sig_print_info (signum); | |
3431 | } | |
3432 | } | |
3433 | } | |
3434 | ||
3435 | do_cleanups (old_chain); | |
3436 | } | |
3437 | ||
3438 | static void | |
96baa820 | 3439 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3440 | { |
3441 | char **argv; | |
3442 | struct cleanup *old_chain; | |
3443 | ||
3444 | /* Break the command line up into args. */ | |
3445 | ||
3446 | argv = buildargv (args); | |
3447 | if (argv == NULL) | |
3448 | { | |
3449 | nomem (0); | |
3450 | } | |
7a292a7a | 3451 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3452 | if (argv[1] != (char *) NULL) |
3453 | { | |
3454 | char *argBuf; | |
3455 | int bufLen; | |
3456 | ||
3457 | bufLen = strlen (argv[0]) + 20; | |
3458 | argBuf = (char *) xmalloc (bufLen); | |
3459 | if (argBuf) | |
3460 | { | |
3461 | int validFlag = 1; | |
3462 | enum target_signal oursig; | |
3463 | ||
3464 | oursig = target_signal_from_name (argv[0]); | |
3465 | memset (argBuf, 0, bufLen); | |
3466 | if (strcmp (argv[1], "Q") == 0) | |
3467 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3468 | else | |
3469 | { | |
3470 | if (strcmp (argv[1], "s") == 0) | |
3471 | { | |
3472 | if (!signal_stop[oursig]) | |
3473 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3474 | else | |
3475 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3476 | } | |
3477 | else if (strcmp (argv[1], "i") == 0) | |
3478 | { | |
3479 | if (!signal_program[oursig]) | |
3480 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3481 | else | |
3482 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3483 | } | |
3484 | else if (strcmp (argv[1], "r") == 0) | |
3485 | { | |
3486 | if (!signal_print[oursig]) | |
3487 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3488 | else | |
3489 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3490 | } | |
3491 | else | |
3492 | validFlag = 0; | |
3493 | } | |
3494 | if (validFlag) | |
3495 | handle_command (argBuf, from_tty); | |
3496 | else | |
3497 | printf_filtered ("Invalid signal handling flag.\n"); | |
3498 | if (argBuf) | |
b8c9b27d | 3499 | xfree (argBuf); |
c906108c SS |
3500 | } |
3501 | } | |
3502 | do_cleanups (old_chain); | |
3503 | } | |
3504 | ||
3505 | /* Print current contents of the tables set by the handle command. | |
3506 | It is possible we should just be printing signals actually used | |
3507 | by the current target (but for things to work right when switching | |
3508 | targets, all signals should be in the signal tables). */ | |
3509 | ||
3510 | static void | |
96baa820 | 3511 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3512 | { |
3513 | enum target_signal oursig; | |
3514 | sig_print_header (); | |
3515 | ||
3516 | if (signum_exp) | |
3517 | { | |
3518 | /* First see if this is a symbol name. */ | |
3519 | oursig = target_signal_from_name (signum_exp); | |
3520 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3521 | { | |
3522 | /* No, try numeric. */ | |
3523 | oursig = | |
bb518678 | 3524 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3525 | } |
3526 | sig_print_info (oursig); | |
3527 | return; | |
3528 | } | |
3529 | ||
3530 | printf_filtered ("\n"); | |
3531 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3532 | for (oursig = TARGET_SIGNAL_FIRST; | |
3533 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3534 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3535 | { | |
3536 | QUIT; | |
3537 | ||
3538 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3539 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3540 | sig_print_info (oursig); |
3541 | } | |
3542 | ||
3543 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3544 | } | |
3545 | \f | |
7a292a7a SS |
3546 | struct inferior_status |
3547 | { | |
3548 | enum target_signal stop_signal; | |
3549 | CORE_ADDR stop_pc; | |
3550 | bpstat stop_bpstat; | |
3551 | int stop_step; | |
3552 | int stop_stack_dummy; | |
3553 | int stopped_by_random_signal; | |
3554 | int trap_expected; | |
3555 | CORE_ADDR step_range_start; | |
3556 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3557 | struct frame_id step_frame_id; |
5fbbeb29 | 3558 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3559 | CORE_ADDR step_resume_break_address; |
3560 | int stop_after_trap; | |
c0236d92 | 3561 | int stop_soon; |
72cec141 | 3562 | struct regcache *stop_registers; |
7a292a7a SS |
3563 | |
3564 | /* These are here because if call_function_by_hand has written some | |
3565 | registers and then decides to call error(), we better not have changed | |
3566 | any registers. */ | |
72cec141 | 3567 | struct regcache *registers; |
7a292a7a | 3568 | |
101dcfbe AC |
3569 | /* A frame unique identifier. */ |
3570 | struct frame_id selected_frame_id; | |
3571 | ||
7a292a7a SS |
3572 | int breakpoint_proceeded; |
3573 | int restore_stack_info; | |
3574 | int proceed_to_finish; | |
3575 | }; | |
3576 | ||
7a292a7a | 3577 | void |
96baa820 JM |
3578 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3579 | LONGEST val) | |
7a292a7a | 3580 | { |
3acba339 | 3581 | int size = register_size (current_gdbarch, regno); |
7a292a7a SS |
3582 | void *buf = alloca (size); |
3583 | store_signed_integer (buf, size, val); | |
0818c12a | 3584 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3585 | } |
3586 | ||
c906108c SS |
3587 | /* Save all of the information associated with the inferior<==>gdb |
3588 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3589 | (defined in inferior.h). */ | |
3590 | ||
7a292a7a | 3591 | struct inferior_status * |
96baa820 | 3592 | save_inferior_status (int restore_stack_info) |
c906108c | 3593 | { |
72cec141 | 3594 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3595 | |
c906108c SS |
3596 | inf_status->stop_signal = stop_signal; |
3597 | inf_status->stop_pc = stop_pc; | |
3598 | inf_status->stop_step = stop_step; | |
3599 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3600 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3601 | inf_status->trap_expected = trap_expected; | |
3602 | inf_status->step_range_start = step_range_start; | |
3603 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3604 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3605 | inf_status->step_over_calls = step_over_calls; |
3606 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3607 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3608 | /* Save original bpstat chain here; replace it with copy of chain. |
3609 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3610 | hand them back the original chain when restore_inferior_status is |
3611 | called. */ | |
c906108c SS |
3612 | inf_status->stop_bpstat = stop_bpstat; |
3613 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3614 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3615 | inf_status->restore_stack_info = restore_stack_info; | |
3616 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3617 | |
72cec141 | 3618 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3619 | |
72cec141 | 3620 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3621 | |
7a424e99 | 3622 | inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
7a292a7a | 3623 | return inf_status; |
c906108c SS |
3624 | } |
3625 | ||
c906108c | 3626 | static int |
96baa820 | 3627 | restore_selected_frame (void *args) |
c906108c | 3628 | { |
488f131b | 3629 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3630 | struct frame_info *frame; |
c906108c | 3631 | |
101dcfbe | 3632 | frame = frame_find_by_id (*fid); |
c906108c | 3633 | |
aa0cd9c1 AC |
3634 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3635 | selected frame. */ | |
101dcfbe | 3636 | if (frame == NULL) |
c906108c SS |
3637 | { |
3638 | warning ("Unable to restore previously selected frame.\n"); | |
3639 | return 0; | |
3640 | } | |
3641 | ||
0f7d239c | 3642 | select_frame (frame); |
c906108c SS |
3643 | |
3644 | return (1); | |
3645 | } | |
3646 | ||
3647 | void | |
96baa820 | 3648 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3649 | { |
3650 | stop_signal = inf_status->stop_signal; | |
3651 | stop_pc = inf_status->stop_pc; | |
3652 | stop_step = inf_status->stop_step; | |
3653 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3654 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3655 | trap_expected = inf_status->trap_expected; | |
3656 | step_range_start = inf_status->step_range_start; | |
3657 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3658 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3659 | step_over_calls = inf_status->step_over_calls; |
3660 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3661 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3662 | bpstat_clear (&stop_bpstat); |
3663 | stop_bpstat = inf_status->stop_bpstat; | |
3664 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3665 | proceed_to_finish = inf_status->proceed_to_finish; | |
3666 | ||
72cec141 AC |
3667 | /* FIXME: Is the restore of stop_registers always needed. */ |
3668 | regcache_xfree (stop_registers); | |
3669 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3670 | |
3671 | /* The inferior can be gone if the user types "print exit(0)" | |
3672 | (and perhaps other times). */ | |
3673 | if (target_has_execution) | |
72cec141 AC |
3674 | /* NB: The register write goes through to the target. */ |
3675 | regcache_cpy (current_regcache, inf_status->registers); | |
3676 | regcache_xfree (inf_status->registers); | |
c906108c | 3677 | |
c906108c SS |
3678 | /* FIXME: If we are being called after stopping in a function which |
3679 | is called from gdb, we should not be trying to restore the | |
3680 | selected frame; it just prints a spurious error message (The | |
3681 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3682 | clobbers the stack)). In fact, should we be restoring the | |
3683 | inferior status at all in that case? . */ | |
3684 | ||
3685 | if (target_has_stack && inf_status->restore_stack_info) | |
3686 | { | |
c906108c | 3687 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3688 | walking the stack might encounter a garbage pointer and |
3689 | error() trying to dereference it. */ | |
488f131b JB |
3690 | if (catch_errors |
3691 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3692 | "Unable to restore previously selected frame:\n", | |
3693 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3694 | /* Error in restoring the selected frame. Select the innermost |
3695 | frame. */ | |
0f7d239c | 3696 | select_frame (get_current_frame ()); |
c906108c SS |
3697 | |
3698 | } | |
c906108c | 3699 | |
72cec141 | 3700 | xfree (inf_status); |
7a292a7a | 3701 | } |
c906108c | 3702 | |
74b7792f AC |
3703 | static void |
3704 | do_restore_inferior_status_cleanup (void *sts) | |
3705 | { | |
3706 | restore_inferior_status (sts); | |
3707 | } | |
3708 | ||
3709 | struct cleanup * | |
3710 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3711 | { | |
3712 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3713 | } | |
3714 | ||
c906108c | 3715 | void |
96baa820 | 3716 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3717 | { |
3718 | /* See save_inferior_status for info on stop_bpstat. */ | |
3719 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3720 | regcache_xfree (inf_status->registers); |
3721 | regcache_xfree (inf_status->stop_registers); | |
3722 | xfree (inf_status); | |
7a292a7a SS |
3723 | } |
3724 | ||
47932f85 DJ |
3725 | int |
3726 | inferior_has_forked (int pid, int *child_pid) | |
3727 | { | |
3728 | struct target_waitstatus last; | |
3729 | ptid_t last_ptid; | |
3730 | ||
3731 | get_last_target_status (&last_ptid, &last); | |
3732 | ||
3733 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3734 | return 0; | |
3735 | ||
3736 | if (ptid_get_pid (last_ptid) != pid) | |
3737 | return 0; | |
3738 | ||
3739 | *child_pid = last.value.related_pid; | |
3740 | return 1; | |
3741 | } | |
3742 | ||
3743 | int | |
3744 | inferior_has_vforked (int pid, int *child_pid) | |
3745 | { | |
3746 | struct target_waitstatus last; | |
3747 | ptid_t last_ptid; | |
3748 | ||
3749 | get_last_target_status (&last_ptid, &last); | |
3750 | ||
3751 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3752 | return 0; | |
3753 | ||
3754 | if (ptid_get_pid (last_ptid) != pid) | |
3755 | return 0; | |
3756 | ||
3757 | *child_pid = last.value.related_pid; | |
3758 | return 1; | |
3759 | } | |
3760 | ||
3761 | int | |
3762 | inferior_has_execd (int pid, char **execd_pathname) | |
3763 | { | |
3764 | struct target_waitstatus last; | |
3765 | ptid_t last_ptid; | |
3766 | ||
3767 | get_last_target_status (&last_ptid, &last); | |
3768 | ||
3769 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3770 | return 0; | |
3771 | ||
3772 | if (ptid_get_pid (last_ptid) != pid) | |
3773 | return 0; | |
3774 | ||
3775 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3776 | return 1; | |
3777 | } | |
3778 | ||
ca6724c1 KB |
3779 | /* Oft used ptids */ |
3780 | ptid_t null_ptid; | |
3781 | ptid_t minus_one_ptid; | |
3782 | ||
3783 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3784 | |
ca6724c1 KB |
3785 | ptid_t |
3786 | ptid_build (int pid, long lwp, long tid) | |
3787 | { | |
3788 | ptid_t ptid; | |
3789 | ||
3790 | ptid.pid = pid; | |
3791 | ptid.lwp = lwp; | |
3792 | ptid.tid = tid; | |
3793 | return ptid; | |
3794 | } | |
3795 | ||
3796 | /* Create a ptid from just a pid. */ | |
3797 | ||
3798 | ptid_t | |
3799 | pid_to_ptid (int pid) | |
3800 | { | |
3801 | return ptid_build (pid, 0, 0); | |
3802 | } | |
3803 | ||
3804 | /* Fetch the pid (process id) component from a ptid. */ | |
3805 | ||
3806 | int | |
3807 | ptid_get_pid (ptid_t ptid) | |
3808 | { | |
3809 | return ptid.pid; | |
3810 | } | |
3811 | ||
3812 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3813 | ||
3814 | long | |
3815 | ptid_get_lwp (ptid_t ptid) | |
3816 | { | |
3817 | return ptid.lwp; | |
3818 | } | |
3819 | ||
3820 | /* Fetch the tid (thread id) component from a ptid. */ | |
3821 | ||
3822 | long | |
3823 | ptid_get_tid (ptid_t ptid) | |
3824 | { | |
3825 | return ptid.tid; | |
3826 | } | |
3827 | ||
3828 | /* ptid_equal() is used to test equality of two ptids. */ | |
3829 | ||
3830 | int | |
3831 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3832 | { | |
3833 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3834 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3835 | } |
3836 | ||
3837 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3838 | to restore the inferior_ptid value saved in a call to | |
3839 | save_inferior_ptid(). */ | |
ce696e05 KB |
3840 | |
3841 | static void | |
3842 | restore_inferior_ptid (void *arg) | |
3843 | { | |
3844 | ptid_t *saved_ptid_ptr = arg; | |
3845 | inferior_ptid = *saved_ptid_ptr; | |
3846 | xfree (arg); | |
3847 | } | |
3848 | ||
3849 | /* Save the value of inferior_ptid so that it may be restored by a | |
3850 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3851 | needed for later doing the cleanup. */ | |
3852 | ||
3853 | struct cleanup * | |
3854 | save_inferior_ptid (void) | |
3855 | { | |
3856 | ptid_t *saved_ptid_ptr; | |
3857 | ||
3858 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3859 | *saved_ptid_ptr = inferior_ptid; | |
3860 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3861 | } | |
c5aa993b | 3862 | \f |
488f131b | 3863 | |
7a292a7a | 3864 | static void |
96baa820 | 3865 | build_infrun (void) |
7a292a7a | 3866 | { |
72cec141 | 3867 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3868 | } |
c906108c | 3869 | |
c906108c | 3870 | void |
96baa820 | 3871 | _initialize_infrun (void) |
c906108c | 3872 | { |
52f0bd74 AC |
3873 | int i; |
3874 | int numsigs; | |
c906108c SS |
3875 | struct cmd_list_element *c; |
3876 | ||
046a4708 AC |
3877 | DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers); |
3878 | deprecated_register_gdbarch_swap (NULL, 0, build_infrun); | |
0f71a2f6 | 3879 | |
c906108c SS |
3880 | add_info ("signals", signals_info, |
3881 | "What debugger does when program gets various signals.\n\ | |
3882 | Specify a signal as argument to print info on that signal only."); | |
3883 | add_info_alias ("handle", "signals", 0); | |
3884 | ||
3885 | add_com ("handle", class_run, handle_command, | |
3886 | concat ("Specify how to handle a signal.\n\ | |
3887 | Args are signals and actions to apply to those signals.\n\ | |
3888 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3889 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3890 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3891 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3892 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
3893 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3894 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3895 | Print means print a message if this signal happens.\n\ | |
3896 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3897 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3898 | Pass and Stop may be combined.", NULL)); | |
3899 | if (xdb_commands) | |
3900 | { | |
3901 | add_com ("lz", class_info, signals_info, | |
3902 | "What debugger does when program gets various signals.\n\ | |
3903 | Specify a signal as argument to print info on that signal only."); | |
3904 | add_com ("z", class_run, xdb_handle_command, | |
3905 | concat ("Specify how to handle a signal.\n\ | |
3906 | Args are signals and actions to apply to those signals.\n\ | |
3907 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3908 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3909 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3910 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3911 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
c906108c SS |
3912 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3913 | nopass), \"Q\" (noprint)\n\ | |
3914 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3915 | Print means print a message if this signal happens.\n\ | |
3916 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3917 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3918 | Pass and Stop may be combined.", NULL)); | |
3919 | } | |
3920 | ||
3921 | if (!dbx_commands) | |
488f131b JB |
3922 | stop_command = |
3923 | 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 |
3924 | This allows you to set a list of commands to be run each time execution\n\ |
3925 | of the program stops.", &cmdlist); | |
3926 | ||
527159b7 RC |
3927 | add_set_cmd ("infrun", class_maintenance, var_zinteger, |
3928 | &debug_infrun, "Set inferior debugging.\n\ | |
3929 | When non-zero, inferior specific debugging is enabled.", &setdebuglist); | |
3930 | ||
c906108c | 3931 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 3932 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
3933 | signal_print = (unsigned char *) |
3934 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3935 | signal_program = (unsigned char *) | |
3936 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3937 | for (i = 0; i < numsigs; i++) | |
3938 | { | |
3939 | signal_stop[i] = 1; | |
3940 | signal_print[i] = 1; | |
3941 | signal_program[i] = 1; | |
3942 | } | |
3943 | ||
3944 | /* Signals caused by debugger's own actions | |
3945 | should not be given to the program afterwards. */ | |
3946 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
3947 | signal_program[TARGET_SIGNAL_INT] = 0; | |
3948 | ||
3949 | /* Signals that are not errors should not normally enter the debugger. */ | |
3950 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
3951 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
3952 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
3953 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
3954 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
3955 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
3956 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
3957 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
3958 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
3959 | signal_print[TARGET_SIGNAL_IO] = 0; | |
3960 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
3961 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
3962 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
3963 | signal_print[TARGET_SIGNAL_URG] = 0; | |
3964 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
3965 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
3966 | ||
cd0fc7c3 SS |
3967 | /* These signals are used internally by user-level thread |
3968 | implementations. (See signal(5) on Solaris.) Like the above | |
3969 | signals, a healthy program receives and handles them as part of | |
3970 | its normal operation. */ | |
3971 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
3972 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
3973 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
3974 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
3975 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
3976 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
3977 | ||
c906108c | 3978 | #ifdef SOLIB_ADD |
cb1a6d5f | 3979 | deprecated_add_show_from_set |
c906108c SS |
3980 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, |
3981 | (char *) &stop_on_solib_events, | |
3982 | "Set stopping for shared library events.\n\ | |
3983 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
3984 | notifies gdb of shared library events. The most common event of interest\n\ | |
488f131b | 3985 | to the user would be loading/unloading of a new library.\n", &setlist), &showlist); |
c906108c SS |
3986 | #endif |
3987 | ||
3988 | c = add_set_enum_cmd ("follow-fork-mode", | |
3989 | class_run, | |
488f131b | 3990 | follow_fork_mode_kind_names, &follow_fork_mode_string, |
c906108c SS |
3991 | "Set debugger response to a program call of fork \ |
3992 | or vfork.\n\ | |
3993 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
3994 | parent - the original process is debugged after a fork\n\ | |
3995 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 3996 | The unfollowed process will continue to run.\n\ |
488f131b | 3997 | By default, the debugger will follow the parent process.", &setlist); |
cb1a6d5f | 3998 | deprecated_add_show_from_set (c, &showlist); |
c906108c | 3999 | |
488f131b | 4000 | c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */ |
1ed2a135 | 4001 | &scheduler_mode, /* current mode */ |
c906108c SS |
4002 | "Set mode for locking scheduler during execution.\n\ |
4003 | off == no locking (threads may preempt at any time)\n\ | |
4004 | on == full locking (no thread except the current thread may run)\n\ | |
4005 | step == scheduler locked during every single-step operation.\n\ | |
4006 | In this mode, no other thread may run during a step command.\n\ | |
488f131b | 4007 | Other threads may run while stepping over a function call ('next').", &setlist); |
c906108c | 4008 | |
9f60d481 | 4009 | set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */ |
cb1a6d5f | 4010 | deprecated_add_show_from_set (c, &showlist); |
5fbbeb29 CF |
4011 | |
4012 | c = add_set_cmd ("step-mode", class_run, | |
488f131b JB |
4013 | var_boolean, (char *) &step_stop_if_no_debug, |
4014 | "Set mode of the step operation. When set, doing a step over a\n\ | |
5fbbeb29 CF |
4015 | function without debug line information will stop at the first\n\ |
4016 | instruction of that function. Otherwise, the function is skipped and\n\ | |
488f131b | 4017 | the step command stops at a different source line.", &setlist); |
cb1a6d5f | 4018 | deprecated_add_show_from_set (c, &showlist); |
ca6724c1 KB |
4019 | |
4020 | /* ptid initializations */ | |
4021 | null_ptid = ptid_build (0, 0, 0); | |
4022 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4023 | inferior_ptid = null_ptid; | |
4024 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 4025 | } |