Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
6aba47ca DJ |
4 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
5 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 | |
8621d6a9 | 6 | Free 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 | |
197e01b6 EZ |
22 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
23 | Boston, MA 02110-1301, USA. */ | |
c906108c SS |
24 | |
25 | #include "defs.h" | |
26 | #include "gdb_string.h" | |
27 | #include <ctype.h> | |
28 | #include "symtab.h" | |
29 | #include "frame.h" | |
30 | #include "inferior.h" | |
60250e8b | 31 | #include "exceptions.h" |
c906108c | 32 | #include "breakpoint.h" |
03f2053f | 33 | #include "gdb_wait.h" |
c906108c SS |
34 | #include "gdbcore.h" |
35 | #include "gdbcmd.h" | |
210661e7 | 36 | #include "cli/cli-script.h" |
c906108c SS |
37 | #include "target.h" |
38 | #include "gdbthread.h" | |
39 | #include "annotate.h" | |
1adeb98a | 40 | #include "symfile.h" |
7a292a7a | 41 | #include "top.h" |
c906108c | 42 | #include <signal.h> |
2acceee2 | 43 | #include "inf-loop.h" |
4e052eda | 44 | #include "regcache.h" |
fd0407d6 | 45 | #include "value.h" |
06600e06 | 46 | #include "observer.h" |
f636b87d | 47 | #include "language.h" |
a77053c2 | 48 | #include "solib.h" |
f17517ea | 49 | #include "main.h" |
a77053c2 | 50 | |
9f976b41 | 51 | #include "gdb_assert.h" |
034dad6f | 52 | #include "mi/mi-common.h" |
c906108c SS |
53 | |
54 | /* Prototypes for local functions */ | |
55 | ||
96baa820 | 56 | static void signals_info (char *, int); |
c906108c | 57 | |
96baa820 | 58 | static void handle_command (char *, int); |
c906108c | 59 | |
96baa820 | 60 | static void sig_print_info (enum target_signal); |
c906108c | 61 | |
96baa820 | 62 | static void sig_print_header (void); |
c906108c | 63 | |
74b7792f | 64 | static void resume_cleanups (void *); |
c906108c | 65 | |
96baa820 | 66 | static int hook_stop_stub (void *); |
c906108c | 67 | |
96baa820 JM |
68 | static int restore_selected_frame (void *); |
69 | ||
70 | static void build_infrun (void); | |
71 | ||
4ef3f3be | 72 | static int follow_fork (void); |
96baa820 JM |
73 | |
74 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 75 | struct cmd_list_element *c); |
96baa820 | 76 | |
96baa820 JM |
77 | struct execution_control_state; |
78 | ||
79 | static int currently_stepping (struct execution_control_state *ecs); | |
80 | ||
81 | static void xdb_handle_command (char *args, int from_tty); | |
82 | ||
ea67f13b DJ |
83 | static int prepare_to_proceed (void); |
84 | ||
96baa820 | 85 | void _initialize_infrun (void); |
43ff13b4 | 86 | |
c906108c SS |
87 | int inferior_ignoring_startup_exec_events = 0; |
88 | int inferior_ignoring_leading_exec_events = 0; | |
89 | ||
5fbbeb29 CF |
90 | /* When set, stop the 'step' command if we enter a function which has |
91 | no line number information. The normal behavior is that we step | |
92 | over such function. */ | |
93 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
94 | static void |
95 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
96 | struct cmd_list_element *c, const char *value) | |
97 | { | |
98 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
99 | } | |
5fbbeb29 | 100 | |
43ff13b4 | 101 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 102 | |
43ff13b4 JM |
103 | int sync_execution = 0; |
104 | ||
c906108c SS |
105 | /* wait_for_inferior and normal_stop use this to notify the user |
106 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
107 | running in. */ |
108 | ||
39f77062 | 109 | static ptid_t previous_inferior_ptid; |
7a292a7a SS |
110 | |
111 | /* This is true for configurations that may follow through execl() and | |
112 | similar functions. At present this is only true for HP-UX native. */ | |
113 | ||
114 | #ifndef MAY_FOLLOW_EXEC | |
115 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
116 | #endif |
117 | ||
7a292a7a SS |
118 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
119 | ||
527159b7 | 120 | static int debug_infrun = 0; |
920d2a44 AC |
121 | static void |
122 | show_debug_infrun (struct ui_file *file, int from_tty, | |
123 | struct cmd_list_element *c, const char *value) | |
124 | { | |
125 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
126 | } | |
527159b7 | 127 | |
d4f3574e SS |
128 | /* If the program uses ELF-style shared libraries, then calls to |
129 | functions in shared libraries go through stubs, which live in a | |
130 | table called the PLT (Procedure Linkage Table). The first time the | |
131 | function is called, the stub sends control to the dynamic linker, | |
132 | which looks up the function's real address, patches the stub so | |
133 | that future calls will go directly to the function, and then passes | |
134 | control to the function. | |
135 | ||
136 | If we are stepping at the source level, we don't want to see any of | |
137 | this --- we just want to skip over the stub and the dynamic linker. | |
138 | The simple approach is to single-step until control leaves the | |
139 | dynamic linker. | |
140 | ||
ca557f44 AC |
141 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
142 | dynamic linker calls functions in the shared C library, so you | |
143 | can't tell from the PC alone whether the dynamic linker is still | |
144 | running. In this case, we use a step-resume breakpoint to get us | |
145 | past the dynamic linker, as if we were using "next" to step over a | |
146 | function call. | |
d4f3574e SS |
147 | |
148 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
149 | linker code or not. Normally, this means we single-step. However, | |
150 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
151 | address where we can place a step-resume breakpoint to get past the | |
152 | linker's symbol resolution function. | |
153 | ||
154 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
155 | pretty portable way, by comparing the PC against the address ranges | |
156 | of the dynamic linker's sections. | |
157 | ||
158 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
159 | it depends on internal details of the dynamic linker. It's usually | |
160 | not too hard to figure out where to put a breakpoint, but it | |
161 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
162 | sanity checking. If it can't figure things out, returning zero and | |
163 | getting the (possibly confusing) stepping behavior is better than | |
164 | signalling an error, which will obscure the change in the | |
165 | inferior's state. */ | |
c906108c | 166 | |
c906108c SS |
167 | /* This function returns TRUE if pc is the address of an instruction |
168 | that lies within the dynamic linker (such as the event hook, or the | |
169 | dld itself). | |
170 | ||
171 | This function must be used only when a dynamic linker event has | |
172 | been caught, and the inferior is being stepped out of the hook, or | |
173 | undefined results are guaranteed. */ | |
174 | ||
175 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
176 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
177 | #endif | |
178 | ||
c2c6d25f | 179 | |
7a292a7a SS |
180 | /* Convert the #defines into values. This is temporary until wfi control |
181 | flow is completely sorted out. */ | |
182 | ||
692590c1 MS |
183 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
184 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
185 | #else | |
186 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
187 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
188 | #endif | |
189 | ||
c906108c SS |
190 | /* Tables of how to react to signals; the user sets them. */ |
191 | ||
192 | static unsigned char *signal_stop; | |
193 | static unsigned char *signal_print; | |
194 | static unsigned char *signal_program; | |
195 | ||
196 | #define SET_SIGS(nsigs,sigs,flags) \ | |
197 | do { \ | |
198 | int signum = (nsigs); \ | |
199 | while (signum-- > 0) \ | |
200 | if ((sigs)[signum]) \ | |
201 | (flags)[signum] = 1; \ | |
202 | } while (0) | |
203 | ||
204 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
205 | do { \ | |
206 | int signum = (nsigs); \ | |
207 | while (signum-- > 0) \ | |
208 | if ((sigs)[signum]) \ | |
209 | (flags)[signum] = 0; \ | |
210 | } while (0) | |
211 | ||
39f77062 KB |
212 | /* Value to pass to target_resume() to cause all threads to resume */ |
213 | ||
214 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
215 | |
216 | /* Command list pointer for the "stop" placeholder. */ | |
217 | ||
218 | static struct cmd_list_element *stop_command; | |
219 | ||
220 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
221 | ||
222 | static int breakpoints_inserted; | |
223 | ||
224 | /* Function inferior was in as of last step command. */ | |
225 | ||
226 | static struct symbol *step_start_function; | |
227 | ||
228 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
229 | ||
230 | static int trap_expected; | |
231 | ||
c906108c SS |
232 | /* Nonzero if we want to give control to the user when we're notified |
233 | of shared library events by the dynamic linker. */ | |
234 | static int stop_on_solib_events; | |
920d2a44 AC |
235 | static void |
236 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
237 | struct cmd_list_element *c, const char *value) | |
238 | { | |
239 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
240 | value); | |
241 | } | |
c906108c | 242 | |
c906108c SS |
243 | /* Nonzero means expecting a trace trap |
244 | and should stop the inferior and return silently when it happens. */ | |
245 | ||
246 | int stop_after_trap; | |
247 | ||
248 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
249 | It is used after attach, due to attaching to a process; | |
250 | when running in the shell before the child program has been exec'd; | |
251 | and when running some kinds of remote stuff (FIXME?). */ | |
252 | ||
c0236d92 | 253 | enum stop_kind stop_soon; |
c906108c SS |
254 | |
255 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
256 | situation when stop_registers should be saved. */ | |
257 | ||
258 | int proceed_to_finish; | |
259 | ||
260 | /* Save register contents here when about to pop a stack dummy frame, | |
261 | if-and-only-if proceed_to_finish is set. | |
262 | Thus this contains the return value from the called function (assuming | |
263 | values are returned in a register). */ | |
264 | ||
72cec141 | 265 | struct regcache *stop_registers; |
c906108c | 266 | |
c906108c SS |
267 | /* Nonzero after stop if current stack frame should be printed. */ |
268 | ||
269 | static int stop_print_frame; | |
270 | ||
271 | static struct breakpoint *step_resume_breakpoint = NULL; | |
c906108c | 272 | |
e02bc4cc | 273 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
274 | returned by target_wait()/deprecated_target_wait_hook(). This |
275 | information is returned by get_last_target_status(). */ | |
39f77062 | 276 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
277 | static struct target_waitstatus target_last_waitstatus; |
278 | ||
c906108c SS |
279 | /* This is used to remember when a fork, vfork or exec event |
280 | was caught by a catchpoint, and thus the event is to be | |
281 | followed at the next resume of the inferior, and not | |
282 | immediately. */ | |
283 | static struct | |
488f131b JB |
284 | { |
285 | enum target_waitkind kind; | |
286 | struct | |
c906108c | 287 | { |
488f131b | 288 | int parent_pid; |
488f131b | 289 | int child_pid; |
c906108c | 290 | } |
488f131b JB |
291 | fork_event; |
292 | char *execd_pathname; | |
293 | } | |
c906108c SS |
294 | pending_follow; |
295 | ||
53904c9e AC |
296 | static const char follow_fork_mode_child[] = "child"; |
297 | static const char follow_fork_mode_parent[] = "parent"; | |
298 | ||
488f131b | 299 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
300 | follow_fork_mode_child, |
301 | follow_fork_mode_parent, | |
302 | NULL | |
ef346e04 | 303 | }; |
c906108c | 304 | |
53904c9e | 305 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
306 | static void |
307 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
308 | struct cmd_list_element *c, const char *value) | |
309 | { | |
310 | fprintf_filtered (file, _("\ | |
311 | Debugger response to a program call of fork or vfork is \"%s\".\n"), | |
312 | value); | |
313 | } | |
c906108c SS |
314 | \f |
315 | ||
6604731b | 316 | static int |
4ef3f3be | 317 | follow_fork (void) |
c906108c | 318 | { |
ea1dd7bc | 319 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
c906108c | 320 | |
6604731b | 321 | return target_follow_fork (follow_child); |
c906108c SS |
322 | } |
323 | ||
6604731b DJ |
324 | void |
325 | follow_inferior_reset_breakpoints (void) | |
c906108c | 326 | { |
6604731b DJ |
327 | /* Was there a step_resume breakpoint? (There was if the user |
328 | did a "next" at the fork() call.) If so, explicitly reset its | |
329 | thread number. | |
330 | ||
331 | step_resumes are a form of bp that are made to be per-thread. | |
332 | Since we created the step_resume bp when the parent process | |
333 | was being debugged, and now are switching to the child process, | |
334 | from the breakpoint package's viewpoint, that's a switch of | |
335 | "threads". We must update the bp's notion of which thread | |
336 | it is for, or it'll be ignored when it triggers. */ | |
337 | ||
338 | if (step_resume_breakpoint) | |
339 | breakpoint_re_set_thread (step_resume_breakpoint); | |
340 | ||
341 | /* Reinsert all breakpoints in the child. The user may have set | |
342 | breakpoints after catching the fork, in which case those | |
343 | were never set in the child, but only in the parent. This makes | |
344 | sure the inserted breakpoints match the breakpoint list. */ | |
345 | ||
346 | breakpoint_re_set (); | |
347 | insert_breakpoints (); | |
c906108c | 348 | } |
c906108c | 349 | |
1adeb98a FN |
350 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
351 | ||
c906108c | 352 | static void |
96baa820 | 353 | follow_exec (int pid, char *execd_pathname) |
c906108c | 354 | { |
c906108c | 355 | int saved_pid = pid; |
7a292a7a SS |
356 | struct target_ops *tgt; |
357 | ||
358 | if (!may_follow_exec) | |
359 | return; | |
c906108c | 360 | |
c906108c SS |
361 | /* This is an exec event that we actually wish to pay attention to. |
362 | Refresh our symbol table to the newly exec'd program, remove any | |
363 | momentary bp's, etc. | |
364 | ||
365 | If there are breakpoints, they aren't really inserted now, | |
366 | since the exec() transformed our inferior into a fresh set | |
367 | of instructions. | |
368 | ||
369 | We want to preserve symbolic breakpoints on the list, since | |
370 | we have hopes that they can be reset after the new a.out's | |
371 | symbol table is read. | |
372 | ||
373 | However, any "raw" breakpoints must be removed from the list | |
374 | (e.g., the solib bp's), since their address is probably invalid | |
375 | now. | |
376 | ||
377 | And, we DON'T want to call delete_breakpoints() here, since | |
378 | that may write the bp's "shadow contents" (the instruction | |
379 | value that was overwritten witha TRAP instruction). Since | |
380 | we now have a new a.out, those shadow contents aren't valid. */ | |
381 | update_breakpoints_after_exec (); | |
382 | ||
383 | /* If there was one, it's gone now. We cannot truly step-to-next | |
384 | statement through an exec(). */ | |
385 | step_resume_breakpoint = NULL; | |
386 | step_range_start = 0; | |
387 | step_range_end = 0; | |
388 | ||
c906108c | 389 | /* What is this a.out's name? */ |
a3f17187 | 390 | printf_unfiltered (_("Executing new program: %s\n"), execd_pathname); |
c906108c SS |
391 | |
392 | /* We've followed the inferior through an exec. Therefore, the | |
393 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
394 | |
395 | /* First collect the run target in effect. */ | |
396 | tgt = find_run_target (); | |
397 | /* If we can't find one, things are in a very strange state... */ | |
398 | if (tgt == NULL) | |
8a3fe4f8 | 399 | error (_("Could find run target to save before following exec")); |
7a292a7a | 400 | |
c906108c SS |
401 | gdb_flush (gdb_stdout); |
402 | target_mourn_inferior (); | |
39f77062 | 403 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 404 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 405 | push_target (tgt); |
c906108c SS |
406 | |
407 | /* That a.out is now the one to use. */ | |
408 | exec_file_attach (execd_pathname, 0); | |
409 | ||
410 | /* And also is where symbols can be found. */ | |
1adeb98a | 411 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
412 | |
413 | /* Reset the shared library package. This ensures that we get | |
414 | a shlib event when the child reaches "_start", at which point | |
415 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 416 | #if defined(SOLIB_RESTART) |
c906108c | 417 | SOLIB_RESTART (); |
7a292a7a SS |
418 | #endif |
419 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 420 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
a77053c2 MK |
421 | #else |
422 | solib_create_inferior_hook (); | |
7a292a7a | 423 | #endif |
c906108c SS |
424 | |
425 | /* Reinsert all breakpoints. (Those which were symbolic have | |
426 | been reset to the proper address in the new a.out, thanks | |
427 | to symbol_file_command...) */ | |
428 | insert_breakpoints (); | |
429 | ||
430 | /* The next resume of this inferior should bring it to the shlib | |
431 | startup breakpoints. (If the user had also set bp's on | |
432 | "main" from the old (parent) process, then they'll auto- | |
433 | matically get reset there in the new process.) */ | |
c906108c SS |
434 | } |
435 | ||
436 | /* Non-zero if we just simulating a single-step. This is needed | |
437 | because we cannot remove the breakpoints in the inferior process | |
438 | until after the `wait' in `wait_for_inferior'. */ | |
439 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
440 | |
441 | /* The thread we inserted single-step breakpoints for. */ | |
442 | static ptid_t singlestep_ptid; | |
443 | ||
fd48f117 DJ |
444 | /* PC when we started this single-step. */ |
445 | static CORE_ADDR singlestep_pc; | |
446 | ||
9f976b41 DJ |
447 | /* If another thread hit the singlestep breakpoint, we save the original |
448 | thread here so that we can resume single-stepping it later. */ | |
449 | static ptid_t saved_singlestep_ptid; | |
450 | static int stepping_past_singlestep_breakpoint; | |
c906108c SS |
451 | \f |
452 | ||
453 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 454 | static void |
74b7792f | 455 | resume_cleanups (void *ignore) |
c906108c SS |
456 | { |
457 | normal_stop (); | |
458 | } | |
459 | ||
53904c9e AC |
460 | static const char schedlock_off[] = "off"; |
461 | static const char schedlock_on[] = "on"; | |
462 | static const char schedlock_step[] = "step"; | |
488f131b | 463 | static const char *scheduler_enums[] = { |
ef346e04 AC |
464 | schedlock_off, |
465 | schedlock_on, | |
466 | schedlock_step, | |
467 | NULL | |
468 | }; | |
920d2a44 AC |
469 | static const char *scheduler_mode = schedlock_off; |
470 | static void | |
471 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
472 | struct cmd_list_element *c, const char *value) | |
473 | { | |
474 | fprintf_filtered (file, _("\ | |
475 | Mode for locking scheduler during execution is \"%s\".\n"), | |
476 | value); | |
477 | } | |
c906108c SS |
478 | |
479 | static void | |
96baa820 | 480 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 481 | { |
eefe576e AC |
482 | if (!target_can_lock_scheduler) |
483 | { | |
484 | scheduler_mode = schedlock_off; | |
485 | error (_("Target '%s' cannot support this command."), target_shortname); | |
486 | } | |
c906108c SS |
487 | } |
488 | ||
489 | ||
490 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
491 | wants to interrupt some lengthy single-stepping operation | |
492 | (for child processes, the SIGINT goes to the inferior, and so | |
493 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
494 | other targets, that's not true). | |
495 | ||
496 | STEP nonzero if we should step (zero to continue instead). | |
497 | SIG is the signal to give the inferior (zero for none). */ | |
498 | void | |
96baa820 | 499 | resume (int step, enum target_signal sig) |
c906108c SS |
500 | { |
501 | int should_resume = 1; | |
74b7792f | 502 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
503 | QUIT; |
504 | ||
527159b7 | 505 | if (debug_infrun) |
8a9de0e4 AC |
506 | fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n", |
507 | step, sig); | |
527159b7 | 508 | |
ef5cf84e MS |
509 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
510 | ||
c906108c | 511 | |
692590c1 MS |
512 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
513 | over an instruction that causes a page fault without triggering | |
514 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
515 | stop, because the hardware watchpoint is not triggered, but it forgets | |
516 | the step request and continues the program normally. | |
517 | Work around the problem by removing hardware watchpoints if a step is | |
518 | requested, GDB will check for a hardware watchpoint trigger after the | |
519 | step anyway. */ | |
520 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
521 | remove_hw_watchpoints (); | |
488f131b | 522 | |
692590c1 | 523 | |
c2c6d25f JM |
524 | /* Normally, by the time we reach `resume', the breakpoints are either |
525 | removed or inserted, as appropriate. The exception is if we're sitting | |
526 | at a permanent breakpoint; we need to step over it, but permanent | |
527 | breakpoints can't be removed. So we have to test for it here. */ | |
528 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
6d350bb5 UW |
529 | { |
530 | if (gdbarch_skip_permanent_breakpoint_p (current_gdbarch)) | |
594f7785 UW |
531 | gdbarch_skip_permanent_breakpoint (current_gdbarch, |
532 | get_current_regcache ()); | |
6d350bb5 UW |
533 | else |
534 | error (_("\ | |
535 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
536 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
537 | a command like `return' or `jump' to continue execution.")); | |
538 | } | |
c2c6d25f | 539 | |
b0ed3589 | 540 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
541 | { |
542 | /* Do it the hard way, w/temp breakpoints */ | |
0b1b3e42 | 543 | if (SOFTWARE_SINGLE_STEP (get_current_frame ())) |
e6590a1b UW |
544 | { |
545 | /* ...and don't ask hardware to do it. */ | |
546 | step = 0; | |
547 | /* and do not pull these breakpoints until after a `wait' in | |
548 | `wait_for_inferior' */ | |
549 | singlestep_breakpoints_inserted_p = 1; | |
550 | singlestep_ptid = inferior_ptid; | |
551 | singlestep_pc = read_pc (); | |
552 | } | |
c906108c SS |
553 | } |
554 | ||
c906108c | 555 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 556 | now to be followed, then do so. */ |
c906108c SS |
557 | switch (pending_follow.kind) |
558 | { | |
6604731b DJ |
559 | case TARGET_WAITKIND_FORKED: |
560 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 561 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
562 | if (follow_fork ()) |
563 | should_resume = 0; | |
c906108c SS |
564 | break; |
565 | ||
6604731b | 566 | case TARGET_WAITKIND_EXECD: |
c906108c | 567 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 568 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
569 | break; |
570 | ||
571 | default: | |
572 | break; | |
573 | } | |
c906108c SS |
574 | |
575 | /* Install inferior's terminal modes. */ | |
576 | target_terminal_inferior (); | |
577 | ||
578 | if (should_resume) | |
579 | { | |
39f77062 | 580 | ptid_t resume_ptid; |
dfcd3bfb | 581 | |
488f131b | 582 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e | 583 | |
8fb3e588 AC |
584 | if ((step || singlestep_breakpoints_inserted_p) |
585 | && (stepping_past_singlestep_breakpoint | |
586 | || (!breakpoints_inserted && breakpoint_here_p (read_pc ())))) | |
c906108c | 587 | { |
ef5cf84e MS |
588 | /* Stepping past a breakpoint without inserting breakpoints. |
589 | Make sure only the current thread gets to step, so that | |
590 | other threads don't sneak past breakpoints while they are | |
591 | not inserted. */ | |
c906108c | 592 | |
ef5cf84e | 593 | resume_ptid = inferior_ptid; |
c906108c | 594 | } |
ef5cf84e | 595 | |
8fb3e588 AC |
596 | if ((scheduler_mode == schedlock_on) |
597 | || (scheduler_mode == schedlock_step | |
598 | && (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 599 | { |
ef5cf84e | 600 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 601 | resume_ptid = inferior_ptid; |
c906108c | 602 | } |
ef5cf84e | 603 | |
e6cf7916 | 604 | if (gdbarch_cannot_step_breakpoint (current_gdbarch)) |
c4ed33b9 AC |
605 | { |
606 | /* Most targets can step a breakpoint instruction, thus | |
607 | executing it normally. But if this one cannot, just | |
608 | continue and we will hit it anyway. */ | |
609 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
610 | step = 0; | |
611 | } | |
39f77062 | 612 | target_resume (resume_ptid, step, sig); |
c906108c SS |
613 | } |
614 | ||
615 | discard_cleanups (old_cleanups); | |
616 | } | |
617 | \f | |
618 | ||
619 | /* Clear out all variables saying what to do when inferior is continued. | |
620 | First do this, then set the ones you want, then call `proceed'. */ | |
621 | ||
622 | void | |
96baa820 | 623 | clear_proceed_status (void) |
c906108c SS |
624 | { |
625 | trap_expected = 0; | |
626 | step_range_start = 0; | |
627 | step_range_end = 0; | |
aa0cd9c1 | 628 | step_frame_id = null_frame_id; |
5fbbeb29 | 629 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c | 630 | stop_after_trap = 0; |
c0236d92 | 631 | stop_soon = NO_STOP_QUIETLY; |
c906108c SS |
632 | proceed_to_finish = 0; |
633 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
634 | ||
d5c31457 UW |
635 | if (stop_registers) |
636 | { | |
637 | regcache_xfree (stop_registers); | |
638 | stop_registers = NULL; | |
639 | } | |
640 | ||
c906108c SS |
641 | /* Discard any remaining commands or status from previous stop. */ |
642 | bpstat_clear (&stop_bpstat); | |
643 | } | |
644 | ||
ea67f13b DJ |
645 | /* This should be suitable for any targets that support threads. */ |
646 | ||
647 | static int | |
648 | prepare_to_proceed (void) | |
649 | { | |
650 | ptid_t wait_ptid; | |
651 | struct target_waitstatus wait_status; | |
652 | ||
653 | /* Get the last target status returned by target_wait(). */ | |
654 | get_last_target_status (&wait_ptid, &wait_status); | |
655 | ||
656 | /* Make sure we were stopped either at a breakpoint, or because | |
657 | of a Ctrl-C. */ | |
658 | if (wait_status.kind != TARGET_WAITKIND_STOPPED | |
8fb3e588 AC |
659 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
660 | && wait_status.value.sig != TARGET_SIGNAL_INT)) | |
ea67f13b DJ |
661 | { |
662 | return 0; | |
663 | } | |
664 | ||
665 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
666 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
667 | { | |
668 | /* Switched over from WAIT_PID. */ | |
669 | CORE_ADDR wait_pc = read_pc_pid (wait_ptid); | |
670 | ||
671 | if (wait_pc != read_pc ()) | |
672 | { | |
673 | /* Switch back to WAIT_PID thread. */ | |
674 | inferior_ptid = wait_ptid; | |
675 | ||
676 | /* FIXME: This stuff came from switch_to_thread() in | |
677 | thread.c (which should probably be a public function). */ | |
35f196d9 | 678 | reinit_frame_cache (); |
ea67f13b DJ |
679 | registers_changed (); |
680 | stop_pc = wait_pc; | |
ea67f13b DJ |
681 | } |
682 | ||
8fb3e588 AC |
683 | /* We return 1 to indicate that there is a breakpoint here, |
684 | so we need to step over it before continuing to avoid | |
685 | hitting it straight away. */ | |
686 | if (breakpoint_here_p (wait_pc)) | |
687 | return 1; | |
ea67f13b DJ |
688 | } |
689 | ||
690 | return 0; | |
8fb3e588 | 691 | |
ea67f13b | 692 | } |
e4846b08 JJ |
693 | |
694 | /* Record the pc of the program the last time it stopped. This is | |
695 | just used internally by wait_for_inferior, but need to be preserved | |
696 | over calls to it and cleared when the inferior is started. */ | |
697 | static CORE_ADDR prev_pc; | |
698 | ||
c906108c SS |
699 | /* Basic routine for continuing the program in various fashions. |
700 | ||
701 | ADDR is the address to resume at, or -1 for resume where stopped. | |
702 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 703 | or -1 for act according to how it stopped. |
c906108c | 704 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
705 | -1 means return after that and print nothing. |
706 | You should probably set various step_... variables | |
707 | before calling here, if you are stepping. | |
c906108c SS |
708 | |
709 | You should call clear_proceed_status before calling proceed. */ | |
710 | ||
711 | void | |
96baa820 | 712 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
713 | { |
714 | int oneproc = 0; | |
715 | ||
716 | if (step > 0) | |
717 | step_start_function = find_pc_function (read_pc ()); | |
718 | if (step < 0) | |
719 | stop_after_trap = 1; | |
720 | ||
2acceee2 | 721 | if (addr == (CORE_ADDR) -1) |
c906108c | 722 | { |
c906108c | 723 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
3352ef37 AC |
724 | /* There is a breakpoint at the address we will resume at, |
725 | step one instruction before inserting breakpoints so that | |
726 | we do not stop right away (and report a second hit at this | |
727 | breakpoint). */ | |
c906108c | 728 | oneproc = 1; |
3352ef37 AC |
729 | else if (gdbarch_single_step_through_delay_p (current_gdbarch) |
730 | && gdbarch_single_step_through_delay (current_gdbarch, | |
731 | get_current_frame ())) | |
732 | /* We stepped onto an instruction that needs to be stepped | |
733 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
734 | oneproc = 1; |
735 | } | |
736 | else | |
737 | { | |
738 | write_pc (addr); | |
c906108c SS |
739 | } |
740 | ||
527159b7 | 741 | if (debug_infrun) |
8a9de0e4 AC |
742 | fprintf_unfiltered (gdb_stdlog, |
743 | "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", | |
744 | paddr_nz (addr), siggnal, step); | |
527159b7 | 745 | |
c906108c SS |
746 | /* In a multi-threaded task we may select another thread |
747 | and then continue or step. | |
748 | ||
749 | But if the old thread was stopped at a breakpoint, it | |
750 | will immediately cause another breakpoint stop without | |
751 | any execution (i.e. it will report a breakpoint hit | |
752 | incorrectly). So we must step over it first. | |
753 | ||
ea67f13b | 754 | prepare_to_proceed checks the current thread against the thread |
c906108c SS |
755 | that reported the most recent event. If a step-over is required |
756 | it returns TRUE and sets the current thread to the old thread. */ | |
ea67f13b DJ |
757 | if (prepare_to_proceed () && breakpoint_here_p (read_pc ())) |
758 | oneproc = 1; | |
c906108c | 759 | |
c906108c SS |
760 | if (oneproc) |
761 | /* We will get a trace trap after one instruction. | |
762 | Continue it automatically and insert breakpoints then. */ | |
763 | trap_expected = 1; | |
764 | else | |
765 | { | |
81d0cc19 GS |
766 | insert_breakpoints (); |
767 | /* If we get here there was no call to error() in | |
8fb3e588 | 768 | insert breakpoints -- so they were inserted. */ |
c906108c SS |
769 | breakpoints_inserted = 1; |
770 | } | |
771 | ||
772 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
773 | stop_signal = siggnal; | |
774 | /* If this signal should not be seen by program, | |
775 | give it zero. Used for debugging signals. */ | |
776 | else if (!signal_program[stop_signal]) | |
777 | stop_signal = TARGET_SIGNAL_0; | |
778 | ||
779 | annotate_starting (); | |
780 | ||
781 | /* Make sure that output from GDB appears before output from the | |
782 | inferior. */ | |
783 | gdb_flush (gdb_stdout); | |
784 | ||
e4846b08 JJ |
785 | /* Refresh prev_pc value just prior to resuming. This used to be |
786 | done in stop_stepping, however, setting prev_pc there did not handle | |
787 | scenarios such as inferior function calls or returning from | |
788 | a function via the return command. In those cases, the prev_pc | |
789 | value was not set properly for subsequent commands. The prev_pc value | |
790 | is used to initialize the starting line number in the ecs. With an | |
791 | invalid value, the gdb next command ends up stopping at the position | |
792 | represented by the next line table entry past our start position. | |
793 | On platforms that generate one line table entry per line, this | |
794 | is not a problem. However, on the ia64, the compiler generates | |
795 | extraneous line table entries that do not increase the line number. | |
796 | When we issue the gdb next command on the ia64 after an inferior call | |
797 | or a return command, we often end up a few instructions forward, still | |
798 | within the original line we started. | |
799 | ||
800 | An attempt was made to have init_execution_control_state () refresh | |
801 | the prev_pc value before calculating the line number. This approach | |
802 | did not work because on platforms that use ptrace, the pc register | |
803 | cannot be read unless the inferior is stopped. At that point, we | |
804 | are not guaranteed the inferior is stopped and so the read_pc () | |
805 | call can fail. Setting the prev_pc value here ensures the value is | |
8fb3e588 | 806 | updated correctly when the inferior is stopped. */ |
e4846b08 JJ |
807 | prev_pc = read_pc (); |
808 | ||
c906108c SS |
809 | /* Resume inferior. */ |
810 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
811 | ||
812 | /* Wait for it to stop (if not standalone) | |
813 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
814 | /* Do this only if we are not using the event loop, or if the target |
815 | does not support asynchronous execution. */ | |
362646f5 | 816 | if (!target_can_async_p ()) |
43ff13b4 JM |
817 | { |
818 | wait_for_inferior (); | |
819 | normal_stop (); | |
820 | } | |
c906108c | 821 | } |
c906108c SS |
822 | \f |
823 | ||
824 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 825 | |
c906108c | 826 | void |
8621d6a9 | 827 | start_remote (int from_tty) |
c906108c SS |
828 | { |
829 | init_thread_list (); | |
830 | init_wait_for_inferior (); | |
c0236d92 | 831 | stop_soon = STOP_QUIETLY; |
c906108c | 832 | trap_expected = 0; |
43ff13b4 | 833 | |
6426a772 JM |
834 | /* Always go on waiting for the target, regardless of the mode. */ |
835 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 836 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
837 | nothing is returned (instead of just blocking). Because of this, |
838 | targets expecting an immediate response need to, internally, set | |
839 | things up so that the target_wait() is forced to eventually | |
840 | timeout. */ | |
841 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
842 | differentiate to its caller what the state of the target is after | |
843 | the initial open has been performed. Here we're assuming that | |
844 | the target has stopped. It should be possible to eventually have | |
845 | target_open() return to the caller an indication that the target | |
846 | is currently running and GDB state should be set to the same as | |
847 | for an async run. */ | |
848 | wait_for_inferior (); | |
8621d6a9 DJ |
849 | |
850 | /* Now that the inferior has stopped, do any bookkeeping like | |
851 | loading shared libraries. We want to do this before normal_stop, | |
852 | so that the displayed frame is up to date. */ | |
853 | post_create_inferior (¤t_target, from_tty); | |
854 | ||
6426a772 | 855 | normal_stop (); |
c906108c SS |
856 | } |
857 | ||
858 | /* Initialize static vars when a new inferior begins. */ | |
859 | ||
860 | void | |
96baa820 | 861 | init_wait_for_inferior (void) |
c906108c SS |
862 | { |
863 | /* These are meaningless until the first time through wait_for_inferior. */ | |
864 | prev_pc = 0; | |
c906108c | 865 | |
c906108c SS |
866 | breakpoints_inserted = 0; |
867 | breakpoint_init_inferior (inf_starting); | |
868 | ||
869 | /* Don't confuse first call to proceed(). */ | |
870 | stop_signal = TARGET_SIGNAL_0; | |
871 | ||
872 | /* The first resume is not following a fork/vfork/exec. */ | |
873 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c | 874 | |
c906108c | 875 | clear_proceed_status (); |
9f976b41 DJ |
876 | |
877 | stepping_past_singlestep_breakpoint = 0; | |
c906108c | 878 | } |
c906108c | 879 | \f |
b83266a0 SS |
880 | /* This enum encodes possible reasons for doing a target_wait, so that |
881 | wfi can call target_wait in one place. (Ultimately the call will be | |
882 | moved out of the infinite loop entirely.) */ | |
883 | ||
c5aa993b JM |
884 | enum infwait_states |
885 | { | |
cd0fc7c3 SS |
886 | infwait_normal_state, |
887 | infwait_thread_hop_state, | |
cd0fc7c3 | 888 | infwait_nonstep_watch_state |
b83266a0 SS |
889 | }; |
890 | ||
11cf8741 JM |
891 | /* Why did the inferior stop? Used to print the appropriate messages |
892 | to the interface from within handle_inferior_event(). */ | |
893 | enum inferior_stop_reason | |
894 | { | |
11cf8741 JM |
895 | /* Step, next, nexti, stepi finished. */ |
896 | END_STEPPING_RANGE, | |
11cf8741 JM |
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; | |
488f131b JB |
927 | int new_thread_event; |
928 | struct target_waitstatus tmpstatus; | |
929 | enum infwait_states infwait_state; | |
930 | ptid_t waiton_ptid; | |
931 | int wait_some_more; | |
932 | }; | |
933 | ||
934 | void init_execution_control_state (struct execution_control_state *ecs); | |
935 | ||
936 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 937 | |
c2c6d25f | 938 | static void step_into_function (struct execution_control_state *ecs); |
44cbf7b5 | 939 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
14e60db5 | 940 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); |
44cbf7b5 AC |
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 | 962 | if (debug_infrun) |
8a9de0e4 | 963 | fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n"); |
527159b7 | 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 | { |
6ad80df0 | 1074 | ecs->another_trap = 0; |
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; | |
cd0fc7c3 SS |
1080 | ecs->sal = find_pc_line (prev_pc, 0); |
1081 | ecs->current_line = ecs->sal.line; | |
1082 | ecs->current_symtab = ecs->sal.symtab; | |
1083 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1084 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1085 | ecs->wp = &(ecs->ws); |
1086 | } | |
1087 | ||
e02bc4cc | 1088 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1089 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1090 | cached by handle_inferior_event(), which gets called immediately | |
1091 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1092 | |
1093 | void | |
488f131b | 1094 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1095 | { |
39f77062 | 1096 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1097 | *status = target_last_waitstatus; |
1098 | } | |
1099 | ||
ac264b3b MS |
1100 | void |
1101 | nullify_last_target_wait_ptid (void) | |
1102 | { | |
1103 | target_last_wait_ptid = minus_one_ptid; | |
1104 | } | |
1105 | ||
dd80620e MS |
1106 | /* Switch thread contexts, maintaining "infrun state". */ |
1107 | ||
1108 | static void | |
1109 | context_switch (struct execution_control_state *ecs) | |
1110 | { | |
1111 | /* Caution: it may happen that the new thread (or the old one!) | |
1112 | is not in the thread list. In this case we must not attempt | |
1113 | to "switch context", or we run the risk that our context may | |
1114 | be lost. This may happen as a result of the target module | |
1115 | mishandling thread creation. */ | |
1116 | ||
fd48f117 DJ |
1117 | if (debug_infrun) |
1118 | { | |
1119 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
1120 | target_pid_to_str (inferior_ptid)); | |
1121 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
1122 | target_pid_to_str (ecs->ptid)); | |
1123 | } | |
1124 | ||
dd80620e | 1125 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) |
488f131b | 1126 | { /* Perform infrun state context switch: */ |
dd80620e | 1127 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1128 | save_infrun_state (inferior_ptid, prev_pc, |
dd80620e | 1129 | trap_expected, step_resume_breakpoint, |
15960608 | 1130 | step_range_start, |
aa0cd9c1 | 1131 | step_range_end, &step_frame_id, |
dd80620e MS |
1132 | ecs->handling_longjmp, ecs->another_trap, |
1133 | ecs->stepping_through_solib_after_catch, | |
1134 | ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1135 | ecs->current_line, ecs->current_symtab); |
dd80620e MS |
1136 | |
1137 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1138 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1139 | &trap_expected, &step_resume_breakpoint, |
15960608 | 1140 | &step_range_start, |
aa0cd9c1 | 1141 | &step_range_end, &step_frame_id, |
dd80620e MS |
1142 | &ecs->handling_longjmp, &ecs->another_trap, |
1143 | &ecs->stepping_through_solib_after_catch, | |
1144 | &ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1145 | &ecs->current_line, &ecs->current_symtab); |
dd80620e MS |
1146 | } |
1147 | inferior_ptid = ecs->ptid; | |
35f196d9 | 1148 | reinit_frame_cache (); |
dd80620e MS |
1149 | } |
1150 | ||
4fa8626c DJ |
1151 | static void |
1152 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1153 | { | |
8aad930b | 1154 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1155 | |
1156 | /* If this target does not decrement the PC after breakpoints, then | |
1157 | we have nothing to do. */ | |
b798847d | 1158 | if (gdbarch_decr_pc_after_break (current_gdbarch) == 0) |
4fa8626c DJ |
1159 | return; |
1160 | ||
1161 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1162 | we aren't, just return. | |
9709f61c DJ |
1163 | |
1164 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
1165 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
1166 | implemented by software breakpoints should be handled through the normal | |
1167 | breakpoint layer. | |
8fb3e588 | 1168 | |
4fa8626c DJ |
1169 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
1170 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1171 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
1172 | gdbarch_decr_pc_after_break. I don't know any specific target that |
1173 | generates these signals at breakpoints (the code has been in GDB since at | |
1174 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 1175 | |
e6cf7916 UW |
1176 | In earlier versions of GDB, a target with |
1177 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
1178 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
1179 | target with both of these set in GDB history, and it seems unlikely to be | |
1180 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c DJ |
1181 | |
1182 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1183 | return; | |
1184 | ||
1185 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1186 | return; | |
1187 | ||
8aad930b AC |
1188 | /* Find the location where (if we've hit a breakpoint) the |
1189 | breakpoint would be. */ | |
b798847d UW |
1190 | breakpoint_pc = read_pc_pid (ecs->ptid) - gdbarch_decr_pc_after_break |
1191 | (current_gdbarch); | |
8aad930b AC |
1192 | |
1193 | if (SOFTWARE_SINGLE_STEP_P ()) | |
1194 | { | |
1195 | /* When using software single-step, a SIGTRAP can only indicate | |
8fb3e588 AC |
1196 | an inserted breakpoint. This actually makes things |
1197 | easier. */ | |
8aad930b AC |
1198 | if (singlestep_breakpoints_inserted_p) |
1199 | /* When software single stepping, the instruction at [prev_pc] | |
1200 | is never a breakpoint, but the instruction following | |
1201 | [prev_pc] (in program execution order) always is. Assume | |
1202 | that following instruction was reached and hence a software | |
1203 | breakpoint was hit. */ | |
1204 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1205 | else if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1206 | /* The inferior was free running (i.e., no single-step | |
1207 | breakpoints inserted) and it hit a software breakpoint. */ | |
1208 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1209 | } | |
1210 | else | |
1211 | { | |
1212 | /* When using hardware single-step, a SIGTRAP is reported for | |
8fb3e588 AC |
1213 | both a completed single-step and a software breakpoint. Need |
1214 | to differentiate between the two as the latter needs | |
90225438 AS |
1215 | adjusting but the former does not. |
1216 | ||
1217 | When the thread to be examined does not match the current thread | |
1218 | context we can't use currently_stepping, so assume no | |
1219 | single-stepping in this case. */ | |
1220 | if (ptid_equal (ecs->ptid, inferior_ptid) && currently_stepping (ecs)) | |
8aad930b AC |
1221 | { |
1222 | if (prev_pc == breakpoint_pc | |
1223 | && software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1224 | /* Hardware single-stepped a software breakpoint (as | |
1225 | occures when the inferior is resumed with PC pointing | |
1226 | at not-yet-hit software breakpoint). Since the | |
1227 | breakpoint really is executed, the inferior needs to be | |
1228 | backed up to the breakpoint address. */ | |
1229 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1230 | } | |
1231 | else | |
1232 | { | |
1233 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1234 | /* The inferior was free running (i.e., no hardware | |
1235 | single-step and no possibility of a false SIGTRAP) and | |
1236 | hit a software breakpoint. */ | |
1237 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1238 | } | |
1239 | } | |
4fa8626c DJ |
1240 | } |
1241 | ||
cd0fc7c3 SS |
1242 | /* Given an execution control state that has been freshly filled in |
1243 | by an event from the inferior, figure out what it means and take | |
1244 | appropriate action. */ | |
c906108c | 1245 | |
7270d8f2 OF |
1246 | int stepped_after_stopped_by_watchpoint; |
1247 | ||
cd0fc7c3 | 1248 | void |
96baa820 | 1249 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1250 | { |
8bbde302 BE |
1251 | /* NOTE: bje/2005-05-02: If you're looking at this code and thinking |
1252 | that the variable stepped_after_stopped_by_watchpoint isn't used, | |
1253 | then you're wrong! See remote.c:remote_stopped_data_address. */ | |
1254 | ||
c8edd8b4 | 1255 | int sw_single_step_trap_p = 0; |
8fb3e588 | 1256 | int stopped_by_watchpoint = -1; /* Mark as unknown. */ |
cd0fc7c3 | 1257 | |
e02bc4cc | 1258 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1259 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1260 | target_last_waitstatus = *ecs->wp; |
1261 | ||
4fa8626c DJ |
1262 | adjust_pc_after_break (ecs); |
1263 | ||
488f131b JB |
1264 | switch (ecs->infwait_state) |
1265 | { | |
1266 | case infwait_thread_hop_state: | |
527159b7 | 1267 | if (debug_infrun) |
8a9de0e4 | 1268 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
488f131b JB |
1269 | /* Cancel the waiton_ptid. */ |
1270 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 | 1271 | break; |
b83266a0 | 1272 | |
488f131b | 1273 | case infwait_normal_state: |
527159b7 | 1274 | if (debug_infrun) |
8a9de0e4 | 1275 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
488f131b JB |
1276 | stepped_after_stopped_by_watchpoint = 0; |
1277 | break; | |
b83266a0 | 1278 | |
488f131b | 1279 | case infwait_nonstep_watch_state: |
527159b7 | 1280 | if (debug_infrun) |
8a9de0e4 AC |
1281 | fprintf_unfiltered (gdb_stdlog, |
1282 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 1283 | insert_breakpoints (); |
c906108c | 1284 | |
488f131b JB |
1285 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1286 | handle things like signals arriving and other things happening | |
1287 | in combination correctly? */ | |
1288 | stepped_after_stopped_by_watchpoint = 1; | |
1289 | break; | |
65e82032 AC |
1290 | |
1291 | default: | |
e2e0b3e5 | 1292 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b JB |
1293 | } |
1294 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1295 | |
35f196d9 | 1296 | reinit_frame_cache (); |
c906108c | 1297 | |
488f131b | 1298 | /* If it's a new process, add it to the thread database */ |
c906108c | 1299 | |
488f131b | 1300 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
b9b5d7ea | 1301 | && !ptid_equal (ecs->ptid, minus_one_ptid) |
488f131b JB |
1302 | && !in_thread_list (ecs->ptid)); |
1303 | ||
1304 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1305 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1306 | { | |
1307 | add_thread (ecs->ptid); | |
c906108c | 1308 | |
488f131b JB |
1309 | ui_out_text (uiout, "[New "); |
1310 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1311 | ui_out_text (uiout, "]\n"); | |
488f131b | 1312 | } |
c906108c | 1313 | |
488f131b JB |
1314 | switch (ecs->ws.kind) |
1315 | { | |
1316 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 1317 | if (debug_infrun) |
8a9de0e4 | 1318 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
488f131b JB |
1319 | /* Ignore gracefully during startup of the inferior, as it |
1320 | might be the shell which has just loaded some objects, | |
1321 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1322 | #ifdef SOLIB_ADD |
c0236d92 | 1323 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1324 | { |
1325 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1326 | breakpoint addresses via breakpoint_re_set. */ | |
1327 | if (breakpoints_inserted) | |
1328 | remove_breakpoints (); | |
c906108c | 1329 | |
488f131b JB |
1330 | /* Check for any newly added shared libraries if we're |
1331 | supposed to be adding them automatically. Switch | |
1332 | terminal for any messages produced by | |
1333 | breakpoint_re_set. */ | |
1334 | target_terminal_ours_for_output (); | |
aff6338a | 1335 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
1336 | stack's section table is kept up-to-date. Architectures, |
1337 | (e.g., PPC64), use the section table to perform | |
1338 | operations such as address => section name and hence | |
1339 | require the table to contain all sections (including | |
1340 | those found in shared libraries). */ | |
aff6338a | 1341 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
1342 | exec_ops to SOLIB_ADD. This is because current GDB is |
1343 | only tooled to propagate section_table changes out from | |
1344 | the "current_target" (see target_resize_to_sections), and | |
1345 | not up from the exec stratum. This, of course, isn't | |
1346 | right. "infrun.c" should only interact with the | |
1347 | exec/process stratum, instead relying on the target stack | |
1348 | to propagate relevant changes (stop, section table | |
1349 | changed, ...) up to other layers. */ | |
aff6338a | 1350 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
1351 | target_terminal_inferior (); |
1352 | ||
1353 | /* Reinsert breakpoints and continue. */ | |
1354 | if (breakpoints_inserted) | |
1355 | insert_breakpoints (); | |
1356 | } | |
c906108c | 1357 | #endif |
488f131b JB |
1358 | resume (0, TARGET_SIGNAL_0); |
1359 | prepare_to_wait (ecs); | |
1360 | return; | |
c5aa993b | 1361 | |
488f131b | 1362 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 1363 | if (debug_infrun) |
8a9de0e4 | 1364 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
1365 | resume (0, TARGET_SIGNAL_0); |
1366 | prepare_to_wait (ecs); | |
1367 | return; | |
c5aa993b | 1368 | |
488f131b | 1369 | case TARGET_WAITKIND_EXITED: |
527159b7 | 1370 | if (debug_infrun) |
8a9de0e4 | 1371 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
488f131b JB |
1372 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1373 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1374 | ||
1375 | /* Record the exit code in the convenience variable $_exitcode, so | |
1376 | that the user can inspect this again later. */ | |
1377 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1378 | value_from_longest (builtin_type_int, | |
1379 | (LONGEST) ecs->ws.value.integer)); | |
1380 | gdb_flush (gdb_stdout); | |
1381 | target_mourn_inferior (); | |
e6590a1b | 1382 | singlestep_breakpoints_inserted_p = 0; /* SOFTWARE_SINGLE_STEP_P() */ |
488f131b JB |
1383 | stop_print_frame = 0; |
1384 | stop_stepping (ecs); | |
1385 | return; | |
c5aa993b | 1386 | |
488f131b | 1387 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 1388 | if (debug_infrun) |
8a9de0e4 | 1389 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
488f131b JB |
1390 | stop_print_frame = 0; |
1391 | stop_signal = ecs->ws.value.sig; | |
1392 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1393 | |
488f131b JB |
1394 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1395 | reach here unless the inferior is dead. However, for years | |
1396 | target_kill() was called here, which hints that fatal signals aren't | |
1397 | really fatal on some systems. If that's true, then some changes | |
1398 | may be needed. */ | |
1399 | target_mourn_inferior (); | |
c906108c | 1400 | |
488f131b | 1401 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
e6590a1b | 1402 | singlestep_breakpoints_inserted_p = 0; /* SOFTWARE_SINGLE_STEP_P() */ |
488f131b JB |
1403 | stop_stepping (ecs); |
1404 | return; | |
c906108c | 1405 | |
488f131b JB |
1406 | /* The following are the only cases in which we keep going; |
1407 | the above cases end in a continue or goto. */ | |
1408 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1409 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 1410 | if (debug_infrun) |
8a9de0e4 | 1411 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
488f131b JB |
1412 | stop_signal = TARGET_SIGNAL_TRAP; |
1413 | pending_follow.kind = ecs->ws.kind; | |
1414 | ||
8e7d2c16 DJ |
1415 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1416 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1417 | |
5a2901d9 DJ |
1418 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
1419 | { | |
1420 | context_switch (ecs); | |
35f196d9 | 1421 | reinit_frame_cache (); |
5a2901d9 DJ |
1422 | } |
1423 | ||
488f131b | 1424 | stop_pc = read_pc (); |
675bf4cb | 1425 | |
00d4360e | 1426 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1427 | |
488f131b | 1428 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1429 | |
1430 | /* If no catchpoint triggered for this, then keep going. */ | |
1431 | if (ecs->random_signal) | |
1432 | { | |
1433 | stop_signal = TARGET_SIGNAL_0; | |
1434 | keep_going (ecs); | |
1435 | return; | |
1436 | } | |
488f131b JB |
1437 | goto process_event_stop_test; |
1438 | ||
1439 | case TARGET_WAITKIND_EXECD: | |
527159b7 | 1440 | if (debug_infrun) |
fc5261f2 | 1441 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b JB |
1442 | stop_signal = TARGET_SIGNAL_TRAP; |
1443 | ||
7d2830a3 | 1444 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
8fb3e588 AC |
1445 | target_wait function. Until then following vfork on HP/UX 10.20 |
1446 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1447 | /* Is this a target which reports multiple exec events per actual |
1448 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1449 | ignore all but the last one. Just resume the exec'r, and wait | |
1450 | for the next exec event. */ | |
1451 | if (inferior_ignoring_leading_exec_events) | |
1452 | { | |
1453 | inferior_ignoring_leading_exec_events--; | |
488f131b JB |
1454 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); |
1455 | prepare_to_wait (ecs); | |
1456 | return; | |
1457 | } | |
1458 | inferior_ignoring_leading_exec_events = | |
1459 | target_reported_exec_events_per_exec_call () - 1; | |
1460 | ||
1461 | pending_follow.execd_pathname = | |
1462 | savestring (ecs->ws.value.execd_pathname, | |
1463 | strlen (ecs->ws.value.execd_pathname)); | |
1464 | ||
488f131b JB |
1465 | /* This causes the eventpoints and symbol table to be reset. Must |
1466 | do this now, before trying to determine whether to stop. */ | |
1467 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1468 | xfree (pending_follow.execd_pathname); | |
c906108c | 1469 | |
488f131b JB |
1470 | stop_pc = read_pc_pid (ecs->ptid); |
1471 | ecs->saved_inferior_ptid = inferior_ptid; | |
1472 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1473 | |
00d4360e | 1474 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1475 | |
488f131b JB |
1476 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1477 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 | 1478 | |
5a2901d9 DJ |
1479 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
1480 | { | |
1481 | context_switch (ecs); | |
35f196d9 | 1482 | reinit_frame_cache (); |
5a2901d9 DJ |
1483 | } |
1484 | ||
04e68871 DJ |
1485 | /* If no catchpoint triggered for this, then keep going. */ |
1486 | if (ecs->random_signal) | |
1487 | { | |
1488 | stop_signal = TARGET_SIGNAL_0; | |
1489 | keep_going (ecs); | |
1490 | return; | |
1491 | } | |
488f131b JB |
1492 | goto process_event_stop_test; |
1493 | ||
b4dc5ffa MK |
1494 | /* Be careful not to try to gather much state about a thread |
1495 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 1496 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 1497 | if (debug_infrun) |
8a9de0e4 | 1498 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
488f131b JB |
1499 | resume (0, TARGET_SIGNAL_0); |
1500 | prepare_to_wait (ecs); | |
1501 | return; | |
c906108c | 1502 | |
488f131b JB |
1503 | /* Before examining the threads further, step this thread to |
1504 | get it entirely out of the syscall. (We get notice of the | |
1505 | event when the thread is just on the verge of exiting a | |
1506 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 1507 | into user code.) */ |
488f131b | 1508 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 1509 | if (debug_infrun) |
8a9de0e4 | 1510 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
488f131b | 1511 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
488f131b JB |
1512 | prepare_to_wait (ecs); |
1513 | return; | |
c906108c | 1514 | |
488f131b | 1515 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 1516 | if (debug_infrun) |
8a9de0e4 | 1517 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
488f131b JB |
1518 | stop_signal = ecs->ws.value.sig; |
1519 | break; | |
c906108c | 1520 | |
488f131b JB |
1521 | /* We had an event in the inferior, but we are not interested |
1522 | in handling it at this level. The lower layers have already | |
8e7d2c16 | 1523 | done what needs to be done, if anything. |
8fb3e588 AC |
1524 | |
1525 | One of the possible circumstances for this is when the | |
1526 | inferior produces output for the console. The inferior has | |
1527 | not stopped, and we are ignoring the event. Another possible | |
1528 | circumstance is any event which the lower level knows will be | |
1529 | reported multiple times without an intervening resume. */ | |
488f131b | 1530 | case TARGET_WAITKIND_IGNORE: |
527159b7 | 1531 | if (debug_infrun) |
8a9de0e4 | 1532 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); |
8e7d2c16 | 1533 | prepare_to_wait (ecs); |
488f131b JB |
1534 | return; |
1535 | } | |
c906108c | 1536 | |
488f131b JB |
1537 | /* We may want to consider not doing a resume here in order to give |
1538 | the user a chance to play with the new thread. It might be good | |
1539 | to make that a user-settable option. */ | |
c906108c | 1540 | |
488f131b JB |
1541 | /* At this point, all threads are stopped (happens automatically in |
1542 | either the OS or the native code). Therefore we need to continue | |
1543 | all threads in order to make progress. */ | |
1544 | if (ecs->new_thread_event) | |
1545 | { | |
1546 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1547 | prepare_to_wait (ecs); | |
1548 | return; | |
1549 | } | |
c906108c | 1550 | |
488f131b JB |
1551 | stop_pc = read_pc_pid (ecs->ptid); |
1552 | ||
527159b7 | 1553 | if (debug_infrun) |
8a9de0e4 | 1554 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc)); |
527159b7 | 1555 | |
9f976b41 DJ |
1556 | if (stepping_past_singlestep_breakpoint) |
1557 | { | |
8fb3e588 AC |
1558 | gdb_assert (SOFTWARE_SINGLE_STEP_P () |
1559 | && singlestep_breakpoints_inserted_p); | |
9f976b41 DJ |
1560 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
1561 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1562 | ||
1563 | stepping_past_singlestep_breakpoint = 0; | |
1564 | ||
1565 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
1566 | breakpoint, or stopped for some other reason. It would be nice if |
1567 | we could tell, but we can't reliably. */ | |
9f976b41 | 1568 | if (stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 1569 | { |
527159b7 | 1570 | if (debug_infrun) |
8a9de0e4 | 1571 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
9f976b41 | 1572 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 1573 | remove_single_step_breakpoints (); |
9f976b41 DJ |
1574 | singlestep_breakpoints_inserted_p = 0; |
1575 | ||
1576 | ecs->random_signal = 0; | |
1577 | ||
1578 | ecs->ptid = saved_singlestep_ptid; | |
1579 | context_switch (ecs); | |
9a4105ab AC |
1580 | if (deprecated_context_hook) |
1581 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1582 | |
1583 | resume (1, TARGET_SIGNAL_0); | |
1584 | prepare_to_wait (ecs); | |
1585 | return; | |
1586 | } | |
1587 | } | |
1588 | ||
1589 | stepping_past_singlestep_breakpoint = 0; | |
1590 | ||
488f131b JB |
1591 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1592 | another thread. If so, then step that thread past the breakpoint, | |
1593 | and continue it. */ | |
1594 | ||
1595 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1596 | { | |
9f976b41 DJ |
1597 | int thread_hop_needed = 0; |
1598 | ||
f8d40ec8 JB |
1599 | /* Check if a regular breakpoint has been hit before checking |
1600 | for a potential single step breakpoint. Otherwise, GDB will | |
1601 | not see this breakpoint hit when stepping onto breakpoints. */ | |
4fa8626c | 1602 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
488f131b | 1603 | { |
c5aa993b | 1604 | ecs->random_signal = 0; |
4fa8626c | 1605 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1606 | thread_hop_needed = 1; |
1607 | } | |
1608 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1609 | { | |
fd48f117 DJ |
1610 | /* We have not context switched yet, so this should be true |
1611 | no matter which thread hit the singlestep breakpoint. */ | |
1612 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
1613 | if (debug_infrun) | |
1614 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
1615 | "trap for %s\n", | |
1616 | target_pid_to_str (ecs->ptid)); | |
1617 | ||
9f976b41 DJ |
1618 | ecs->random_signal = 0; |
1619 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1620 | change when we go from single-threaded to multi-threaded. If | |
1621 | the singlestep_ptid is still in the list, assume that it is | |
1622 | really different from ecs->ptid. */ | |
1623 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1624 | && in_thread_list (singlestep_ptid)) | |
1625 | { | |
fd48f117 DJ |
1626 | /* If the PC of the thread we were trying to single-step |
1627 | has changed, discard this event (which we were going | |
1628 | to ignore anyway), and pretend we saw that thread | |
1629 | trap. This prevents us continuously moving the | |
1630 | single-step breakpoint forward, one instruction at a | |
1631 | time. If the PC has changed, then the thread we were | |
1632 | trying to single-step has trapped or been signalled, | |
1633 | but the event has not been reported to GDB yet. | |
1634 | ||
1635 | There might be some cases where this loses signal | |
1636 | information, if a signal has arrived at exactly the | |
1637 | same time that the PC changed, but this is the best | |
1638 | we can do with the information available. Perhaps we | |
1639 | should arrange to report all events for all threads | |
1640 | when they stop, or to re-poll the remote looking for | |
1641 | this particular thread (i.e. temporarily enable | |
1642 | schedlock). */ | |
1643 | if (read_pc_pid (singlestep_ptid) != singlestep_pc) | |
1644 | { | |
1645 | if (debug_infrun) | |
1646 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
1647 | " but expected thread advanced also\n"); | |
1648 | ||
1649 | /* The current context still belongs to | |
1650 | singlestep_ptid. Don't swap here, since that's | |
1651 | the context we want to use. Just fudge our | |
1652 | state and continue. */ | |
1653 | ecs->ptid = singlestep_ptid; | |
1654 | stop_pc = read_pc_pid (ecs->ptid); | |
1655 | } | |
1656 | else | |
1657 | { | |
1658 | if (debug_infrun) | |
1659 | fprintf_unfiltered (gdb_stdlog, | |
1660 | "infrun: unexpected thread\n"); | |
1661 | ||
1662 | thread_hop_needed = 1; | |
1663 | stepping_past_singlestep_breakpoint = 1; | |
1664 | saved_singlestep_ptid = singlestep_ptid; | |
1665 | } | |
9f976b41 DJ |
1666 | } |
1667 | } | |
1668 | ||
1669 | if (thread_hop_needed) | |
8fb3e588 AC |
1670 | { |
1671 | int remove_status; | |
1672 | ||
527159b7 | 1673 | if (debug_infrun) |
8a9de0e4 | 1674 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 1675 | |
8fb3e588 AC |
1676 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1677 | Just continue. */ | |
1678 | ||
1679 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
488f131b | 1680 | { |
8fb3e588 | 1681 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 1682 | remove_single_step_breakpoints (); |
8fb3e588 AC |
1683 | singlestep_breakpoints_inserted_p = 0; |
1684 | } | |
1685 | ||
1686 | remove_status = remove_breakpoints (); | |
1687 | /* Did we fail to remove breakpoints? If so, try | |
1688 | to set the PC past the bp. (There's at least | |
1689 | one situation in which we can fail to remove | |
1690 | the bp's: On HP-UX's that use ttrace, we can't | |
1691 | change the address space of a vforking child | |
1692 | process until the child exits (well, okay, not | |
1693 | then either :-) or execs. */ | |
1694 | if (remove_status != 0) | |
1695 | { | |
1696 | /* FIXME! This is obviously non-portable! */ | |
1697 | write_pc_pid (stop_pc + 4, ecs->ptid); | |
1698 | /* We need to restart all the threads now, | |
1699 | * unles we're running in scheduler-locked mode. | |
1700 | * Use currently_stepping to determine whether to | |
1701 | * step or continue. | |
1702 | */ | |
1703 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1704 | if (scheduler_mode == schedlock_on) | |
1705 | target_resume (ecs->ptid, | |
1706 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
488f131b | 1707 | else |
8fb3e588 AC |
1708 | target_resume (RESUME_ALL, |
1709 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1710 | prepare_to_wait (ecs); | |
1711 | return; | |
1712 | } | |
1713 | else | |
1714 | { /* Single step */ | |
1715 | breakpoints_inserted = 0; | |
1716 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1717 | context_switch (ecs); | |
1718 | ecs->waiton_ptid = ecs->ptid; | |
1719 | ecs->wp = &(ecs->ws); | |
1720 | ecs->another_trap = 1; | |
1721 | ||
1722 | ecs->infwait_state = infwait_thread_hop_state; | |
1723 | keep_going (ecs); | |
1724 | registers_changed (); | |
1725 | return; | |
1726 | } | |
488f131b | 1727 | } |
f8d40ec8 | 1728 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
1729 | { |
1730 | sw_single_step_trap_p = 1; | |
1731 | ecs->random_signal = 0; | |
1732 | } | |
488f131b JB |
1733 | } |
1734 | else | |
1735 | ecs->random_signal = 1; | |
c906108c | 1736 | |
488f131b | 1737 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1738 | so, then switch to that thread. */ |
1739 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1740 | { |
527159b7 | 1741 | if (debug_infrun) |
8a9de0e4 | 1742 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 1743 | |
488f131b | 1744 | context_switch (ecs); |
c5aa993b | 1745 | |
9a4105ab AC |
1746 | if (deprecated_context_hook) |
1747 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 1748 | } |
c906108c | 1749 | |
488f131b JB |
1750 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1751 | { | |
1752 | /* Pull the single step breakpoints out of the target. */ | |
e0cd558a | 1753 | remove_single_step_breakpoints (); |
488f131b JB |
1754 | singlestep_breakpoints_inserted_p = 0; |
1755 | } | |
c906108c | 1756 | |
488f131b JB |
1757 | /* It may not be necessary to disable the watchpoint to stop over |
1758 | it. For example, the PA can (with some kernel cooperation) | |
1759 | single step over a watchpoint without disabling the watchpoint. */ | |
1760 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1761 | { | |
527159b7 | 1762 | if (debug_infrun) |
8a9de0e4 | 1763 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
488f131b JB |
1764 | resume (1, 0); |
1765 | prepare_to_wait (ecs); | |
1766 | return; | |
1767 | } | |
c906108c | 1768 | |
488f131b JB |
1769 | /* It is far more common to need to disable a watchpoint to step |
1770 | the inferior over it. FIXME. What else might a debug | |
1771 | register or page protection watchpoint scheme need here? */ | |
e6cf7916 UW |
1772 | if (gdbarch_have_nonsteppable_watchpoint (current_gdbarch) |
1773 | && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
488f131b JB |
1774 | { |
1775 | /* At this point, we are stopped at an instruction which has | |
1776 | attempted to write to a piece of memory under control of | |
1777 | a watchpoint. The instruction hasn't actually executed | |
1778 | yet. If we were to evaluate the watchpoint expression | |
1779 | now, we would get the old value, and therefore no change | |
1780 | would seem to have occurred. | |
1781 | ||
1782 | In order to make watchpoints work `right', we really need | |
1783 | to complete the memory write, and then evaluate the | |
1784 | watchpoint expression. The following code does that by | |
1785 | removing the watchpoint (actually, all watchpoints and | |
1786 | breakpoints), single-stepping the target, re-inserting | |
1787 | watchpoints, and then falling through to let normal | |
1788 | single-step processing handle proceed. Since this | |
1789 | includes evaluating watchpoints, things will come to a | |
1790 | stop in the correct manner. */ | |
1791 | ||
527159b7 | 1792 | if (debug_infrun) |
8a9de0e4 | 1793 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
488f131b JB |
1794 | remove_breakpoints (); |
1795 | registers_changed (); | |
1796 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1797 | |
488f131b JB |
1798 | ecs->waiton_ptid = ecs->ptid; |
1799 | ecs->wp = &(ecs->ws); | |
1800 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1801 | prepare_to_wait (ecs); | |
1802 | return; | |
1803 | } | |
1804 | ||
1805 | /* It may be possible to simply continue after a watchpoint. */ | |
1806 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
00d4360e | 1807 | stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
488f131b JB |
1808 | |
1809 | ecs->stop_func_start = 0; | |
1810 | ecs->stop_func_end = 0; | |
1811 | ecs->stop_func_name = 0; | |
1812 | /* Don't care about return value; stop_func_start and stop_func_name | |
1813 | will both be 0 if it doesn't work. */ | |
1814 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1815 | &ecs->stop_func_start, &ecs->stop_func_end); | |
cbf3b44a UW |
1816 | ecs->stop_func_start |
1817 | += gdbarch_deprecated_function_start_offset (current_gdbarch); | |
488f131b JB |
1818 | ecs->another_trap = 0; |
1819 | bpstat_clear (&stop_bpstat); | |
1820 | stop_step = 0; | |
1821 | stop_stack_dummy = 0; | |
1822 | stop_print_frame = 1; | |
1823 | ecs->random_signal = 0; | |
1824 | stopped_by_random_signal = 0; | |
488f131b | 1825 | |
3352ef37 AC |
1826 | if (stop_signal == TARGET_SIGNAL_TRAP |
1827 | && trap_expected | |
1828 | && gdbarch_single_step_through_delay_p (current_gdbarch) | |
1829 | && currently_stepping (ecs)) | |
1830 | { | |
1831 | /* We're trying to step of a breakpoint. Turns out that we're | |
1832 | also on an instruction that needs to be stepped multiple | |
1833 | times before it's been fully executing. E.g., architectures | |
1834 | with a delay slot. It needs to be stepped twice, once for | |
1835 | the instruction and once for the delay slot. */ | |
1836 | int step_through_delay | |
1837 | = gdbarch_single_step_through_delay (current_gdbarch, | |
1838 | get_current_frame ()); | |
527159b7 | 1839 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 1840 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
3352ef37 AC |
1841 | if (step_range_end == 0 && step_through_delay) |
1842 | { | |
1843 | /* The user issued a continue when stopped at a breakpoint. | |
1844 | Set up for another trap and get out of here. */ | |
1845 | ecs->another_trap = 1; | |
1846 | keep_going (ecs); | |
1847 | return; | |
1848 | } | |
1849 | else if (step_through_delay) | |
1850 | { | |
1851 | /* The user issued a step when stopped at a breakpoint. | |
1852 | Maybe we should stop, maybe we should not - the delay | |
1853 | slot *might* correspond to a line of source. In any | |
1854 | case, don't decide that here, just set ecs->another_trap, | |
1855 | making sure we single-step again before breakpoints are | |
1856 | re-inserted. */ | |
1857 | ecs->another_trap = 1; | |
1858 | } | |
1859 | } | |
1860 | ||
488f131b JB |
1861 | /* Look at the cause of the stop, and decide what to do. |
1862 | The alternatives are: | |
1863 | 1) break; to really stop and return to the debugger, | |
1864 | 2) drop through to start up again | |
1865 | (set ecs->another_trap to 1 to single step once) | |
1866 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1867 | will be made according to the signal handling tables. */ | |
1868 | ||
1869 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1870 | that have to do with the program's own actions. Note that |
1871 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1872 | on the operating system version. Here we detect when a SIGILL or | |
1873 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1874 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1875 | when we're trying to execute a breakpoint instruction on a | |
1876 | non-executable stack. This happens for call dummy breakpoints | |
1877 | for architectures like SPARC that place call dummies on the | |
1878 | stack. */ | |
488f131b JB |
1879 | |
1880 | if (stop_signal == TARGET_SIGNAL_TRAP | |
8fb3e588 AC |
1881 | || (breakpoints_inserted |
1882 | && (stop_signal == TARGET_SIGNAL_ILL | |
1883 | || stop_signal == TARGET_SIGNAL_SEGV | |
1884 | || stop_signal == TARGET_SIGNAL_EMT)) | |
1885 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1886 | { |
1887 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1888 | { | |
527159b7 | 1889 | if (debug_infrun) |
8a9de0e4 | 1890 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
1891 | stop_print_frame = 0; |
1892 | stop_stepping (ecs); | |
1893 | return; | |
1894 | } | |
c54cfec8 EZ |
1895 | |
1896 | /* This is originated from start_remote(), start_inferior() and | |
1897 | shared libraries hook functions. */ | |
c0236d92 | 1898 | if (stop_soon == STOP_QUIETLY) |
488f131b | 1899 | { |
527159b7 | 1900 | if (debug_infrun) |
8a9de0e4 | 1901 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
1902 | stop_stepping (ecs); |
1903 | return; | |
1904 | } | |
1905 | ||
c54cfec8 EZ |
1906 | /* This originates from attach_command(). We need to overwrite |
1907 | the stop_signal here, because some kernels don't ignore a | |
1908 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1909 | See more comments in inferior.h. */ | |
c0236d92 | 1910 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1911 | { |
1912 | stop_stepping (ecs); | |
1913 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1914 | stop_signal = TARGET_SIGNAL_0; | |
1915 | return; | |
1916 | } | |
1917 | ||
d303a6c7 AC |
1918 | /* Don't even think about breakpoints if just proceeded over a |
1919 | breakpoint. */ | |
1920 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) | |
527159b7 RC |
1921 | { |
1922 | if (debug_infrun) | |
8a9de0e4 | 1923 | fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n"); |
527159b7 RC |
1924 | bpstat_clear (&stop_bpstat); |
1925 | } | |
488f131b JB |
1926 | else |
1927 | { | |
1928 | /* See if there is a breakpoint at the current PC. */ | |
8fb3e588 | 1929 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
00d4360e | 1930 | stopped_by_watchpoint); |
488f131b | 1931 | |
488f131b JB |
1932 | /* Following in case break condition called a |
1933 | function. */ | |
1934 | stop_print_frame = 1; | |
1935 | } | |
1936 | ||
73dd234f | 1937 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
1938 | at one stage in the past included checks for an inferior |
1939 | function call's call dummy's return breakpoint. The original | |
1940 | comment, that went with the test, read: | |
73dd234f | 1941 | |
8fb3e588 AC |
1942 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
1943 | another signal besides SIGTRAP, so check here as well as | |
1944 | above.'' | |
73dd234f AC |
1945 | |
1946 | If someone ever tries to get get call dummys on a | |
1947 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
1948 | with something like a SIGSEGV), then those tests might need |
1949 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 1950 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
1951 | suspect that it won't be the case. |
1952 | ||
8fb3e588 AC |
1953 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
1954 | be necessary for call dummies on a non-executable stack on | |
1955 | SPARC. */ | |
73dd234f | 1956 | |
488f131b JB |
1957 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1958 | ecs->random_signal | |
1959 | = !(bpstat_explains_signal (stop_bpstat) | |
1960 | || trap_expected | |
488f131b | 1961 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
1962 | else |
1963 | { | |
73dd234f | 1964 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
1965 | if (!ecs->random_signal) |
1966 | stop_signal = TARGET_SIGNAL_TRAP; | |
1967 | } | |
1968 | } | |
1969 | ||
1970 | /* When we reach this point, we've pretty much decided | |
1971 | that the reason for stopping must've been a random | |
1972 | (unexpected) signal. */ | |
1973 | ||
1974 | else | |
1975 | ecs->random_signal = 1; | |
488f131b | 1976 | |
04e68871 | 1977 | process_event_stop_test: |
488f131b JB |
1978 | /* For the program's own signals, act according to |
1979 | the signal handling tables. */ | |
1980 | ||
1981 | if (ecs->random_signal) | |
1982 | { | |
1983 | /* Signal not for debugging purposes. */ | |
1984 | int printed = 0; | |
1985 | ||
527159b7 | 1986 | if (debug_infrun) |
8a9de0e4 | 1987 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal); |
527159b7 | 1988 | |
488f131b JB |
1989 | stopped_by_random_signal = 1; |
1990 | ||
1991 | if (signal_print[stop_signal]) | |
1992 | { | |
1993 | printed = 1; | |
1994 | target_terminal_ours_for_output (); | |
1995 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
1996 | } | |
1997 | if (signal_stop[stop_signal]) | |
1998 | { | |
1999 | stop_stepping (ecs); | |
2000 | return; | |
2001 | } | |
2002 | /* If not going to stop, give terminal back | |
2003 | if we took it away. */ | |
2004 | else if (printed) | |
2005 | target_terminal_inferior (); | |
2006 | ||
2007 | /* Clear the signal if it should not be passed. */ | |
2008 | if (signal_program[stop_signal] == 0) | |
2009 | stop_signal = TARGET_SIGNAL_0; | |
2010 | ||
68f53502 AC |
2011 | if (prev_pc == read_pc () |
2012 | && !breakpoints_inserted | |
2013 | && breakpoint_here_p (read_pc ()) | |
2014 | && step_resume_breakpoint == NULL) | |
2015 | { | |
2016 | /* We were just starting a new sequence, attempting to | |
2017 | single-step off of a breakpoint and expecting a SIGTRAP. | |
2018 | Intead this signal arrives. This signal will take us out | |
2019 | of the stepping range so GDB needs to remember to, when | |
2020 | the signal handler returns, resume stepping off that | |
2021 | breakpoint. */ | |
2022 | /* To simplify things, "continue" is forced to use the same | |
2023 | code paths as single-step - set a breakpoint at the | |
2024 | signal return address and then, once hit, step off that | |
2025 | breakpoint. */ | |
d3169d93 | 2026 | |
44cbf7b5 | 2027 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
68f53502 | 2028 | ecs->step_after_step_resume_breakpoint = 1; |
9d799f85 AC |
2029 | keep_going (ecs); |
2030 | return; | |
68f53502 | 2031 | } |
9d799f85 AC |
2032 | |
2033 | if (step_range_end != 0 | |
2034 | && stop_signal != TARGET_SIGNAL_0 | |
2035 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
2036 | && frame_id_eq (get_frame_id (get_current_frame ()), | |
2037 | step_frame_id) | |
2038 | && step_resume_breakpoint == NULL) | |
d303a6c7 AC |
2039 | { |
2040 | /* The inferior is about to take a signal that will take it | |
2041 | out of the single step range. Set a breakpoint at the | |
2042 | current PC (which is presumably where the signal handler | |
2043 | will eventually return) and then allow the inferior to | |
2044 | run free. | |
2045 | ||
2046 | Note that this is only needed for a signal delivered | |
2047 | while in the single-step range. Nested signals aren't a | |
2048 | problem as they eventually all return. */ | |
44cbf7b5 | 2049 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
9d799f85 AC |
2050 | keep_going (ecs); |
2051 | return; | |
d303a6c7 | 2052 | } |
9d799f85 AC |
2053 | |
2054 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
2055 | when either there's a nested signal, or when there's a | |
2056 | pending signal enabled just as the signal handler returns | |
2057 | (leaving the inferior at the step-resume-breakpoint without | |
2058 | actually executing it). Either way continue until the | |
2059 | breakpoint is really hit. */ | |
488f131b JB |
2060 | keep_going (ecs); |
2061 | return; | |
2062 | } | |
2063 | ||
2064 | /* Handle cases caused by hitting a breakpoint. */ | |
2065 | { | |
2066 | CORE_ADDR jmp_buf_pc; | |
2067 | struct bpstat_what what; | |
2068 | ||
2069 | what = bpstat_what (stop_bpstat); | |
2070 | ||
2071 | if (what.call_dummy) | |
2072 | { | |
2073 | stop_stack_dummy = 1; | |
c5aa993b | 2074 | } |
c906108c | 2075 | |
488f131b | 2076 | switch (what.main_action) |
c5aa993b | 2077 | { |
488f131b JB |
2078 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2079 | /* If we hit the breakpoint at longjmp, disable it for the | |
2080 | duration of this command. Then, install a temporary | |
2081 | breakpoint at the target of the jmp_buf. */ | |
527159b7 | 2082 | if (debug_infrun) |
8802d8ed | 2083 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); |
488f131b JB |
2084 | disable_longjmp_breakpoint (); |
2085 | remove_breakpoints (); | |
2086 | breakpoints_inserted = 0; | |
91104499 | 2087 | if (!gdbarch_get_longjmp_target_p (current_gdbarch) |
60ade65d UW |
2088 | || !gdbarch_get_longjmp_target (current_gdbarch, |
2089 | get_current_frame (), &jmp_buf_pc)) | |
c5aa993b | 2090 | { |
488f131b | 2091 | keep_going (ecs); |
104c1213 | 2092 | return; |
c5aa993b | 2093 | } |
488f131b JB |
2094 | |
2095 | /* Need to blow away step-resume breakpoint, as it | |
2096 | interferes with us */ | |
2097 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2098 | { |
488f131b | 2099 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2100 | } |
c906108c | 2101 | |
8fb3e588 | 2102 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2103 | ecs->handling_longjmp = 1; /* FIXME */ |
2104 | keep_going (ecs); | |
2105 | return; | |
c906108c | 2106 | |
488f131b JB |
2107 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2108 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
527159b7 | 2109 | if (debug_infrun) |
8802d8ed | 2110 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); |
488f131b JB |
2111 | remove_breakpoints (); |
2112 | breakpoints_inserted = 0; | |
488f131b JB |
2113 | disable_longjmp_breakpoint (); |
2114 | ecs->handling_longjmp = 0; /* FIXME */ | |
2115 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2116 | break; | |
2117 | /* else fallthrough */ | |
2118 | ||
2119 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 2120 | if (debug_infrun) |
8802d8ed | 2121 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
488f131b | 2122 | if (breakpoints_inserted) |
569631c6 | 2123 | remove_breakpoints (); |
488f131b JB |
2124 | breakpoints_inserted = 0; |
2125 | ecs->another_trap = 1; | |
2126 | /* Still need to check other stuff, at least the case | |
2127 | where we are stepping and step out of the right range. */ | |
2128 | break; | |
c906108c | 2129 | |
488f131b | 2130 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 2131 | if (debug_infrun) |
8802d8ed | 2132 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
488f131b | 2133 | stop_print_frame = 1; |
c906108c | 2134 | |
d303a6c7 AC |
2135 | /* We are about to nuke the step_resume_breakpointt via the |
2136 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2137 | |
488f131b JB |
2138 | stop_stepping (ecs); |
2139 | return; | |
c5aa993b | 2140 | |
488f131b | 2141 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 2142 | if (debug_infrun) |
8802d8ed | 2143 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
488f131b | 2144 | stop_print_frame = 0; |
c5aa993b | 2145 | |
d303a6c7 AC |
2146 | /* We are about to nuke the step_resume_breakpoin via the |
2147 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2148 | |
488f131b | 2149 | stop_stepping (ecs); |
e441088d | 2150 | return; |
c5aa993b | 2151 | |
488f131b JB |
2152 | case BPSTAT_WHAT_STEP_RESUME: |
2153 | /* This proably demands a more elegant solution, but, yeah | |
2154 | right... | |
c5aa993b | 2155 | |
488f131b JB |
2156 | This function's use of the simple variable |
2157 | step_resume_breakpoint doesn't seem to accomodate | |
2158 | simultaneously active step-resume bp's, although the | |
2159 | breakpoint list certainly can. | |
c5aa993b | 2160 | |
488f131b JB |
2161 | If we reach here and step_resume_breakpoint is already |
2162 | NULL, then apparently we have multiple active | |
2163 | step-resume bp's. We'll just delete the breakpoint we | |
2164 | stopped at, and carry on. | |
2165 | ||
2166 | Correction: what the code currently does is delete a | |
2167 | step-resume bp, but it makes no effort to ensure that | |
2168 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2169 | |
527159b7 | 2170 | if (debug_infrun) |
8802d8ed | 2171 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); |
527159b7 | 2172 | |
488f131b JB |
2173 | if (step_resume_breakpoint == NULL) |
2174 | { | |
2175 | step_resume_breakpoint = | |
2176 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2177 | } | |
2178 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
68f53502 AC |
2179 | if (ecs->step_after_step_resume_breakpoint) |
2180 | { | |
2181 | /* Back when the step-resume breakpoint was inserted, we | |
2182 | were trying to single-step off a breakpoint. Go back | |
2183 | to doing that. */ | |
2184 | ecs->step_after_step_resume_breakpoint = 0; | |
2185 | remove_breakpoints (); | |
2186 | breakpoints_inserted = 0; | |
2187 | ecs->another_trap = 1; | |
2188 | keep_going (ecs); | |
2189 | return; | |
2190 | } | |
488f131b JB |
2191 | break; |
2192 | ||
488f131b JB |
2193 | case BPSTAT_WHAT_CHECK_SHLIBS: |
2194 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
c906108c | 2195 | { |
527159b7 | 2196 | if (debug_infrun) |
8802d8ed | 2197 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n"); |
488f131b JB |
2198 | /* Remove breakpoints, we eventually want to step over the |
2199 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2200 | breakpoint addresses via breakpoint_re_set. */ | |
2201 | if (breakpoints_inserted) | |
2202 | remove_breakpoints (); | |
c5aa993b | 2203 | breakpoints_inserted = 0; |
488f131b JB |
2204 | |
2205 | /* Check for any newly added shared libraries if we're | |
2206 | supposed to be adding them automatically. Switch | |
2207 | terminal for any messages produced by | |
2208 | breakpoint_re_set. */ | |
2209 | target_terminal_ours_for_output (); | |
aff6338a | 2210 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
2211 | stack's section table is kept up-to-date. Architectures, |
2212 | (e.g., PPC64), use the section table to perform | |
2213 | operations such as address => section name and hence | |
2214 | require the table to contain all sections (including | |
2215 | those found in shared libraries). */ | |
aff6338a | 2216 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
2217 | exec_ops to SOLIB_ADD. This is because current GDB is |
2218 | only tooled to propagate section_table changes out from | |
2219 | the "current_target" (see target_resize_to_sections), and | |
2220 | not up from the exec stratum. This, of course, isn't | |
2221 | right. "infrun.c" should only interact with the | |
2222 | exec/process stratum, instead relying on the target stack | |
2223 | to propagate relevant changes (stop, section table | |
2224 | changed, ...) up to other layers. */ | |
a77053c2 | 2225 | #ifdef SOLIB_ADD |
aff6338a | 2226 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
a77053c2 MK |
2227 | #else |
2228 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
2229 | #endif | |
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 | 2287 | } |
488f131b | 2288 | break; |
c906108c | 2289 | |
488f131b JB |
2290 | case BPSTAT_WHAT_LAST: |
2291 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2292 | |
488f131b JB |
2293 | case BPSTAT_WHAT_KEEP_CHECKING: |
2294 | break; | |
2295 | } | |
2296 | } | |
c906108c | 2297 | |
488f131b JB |
2298 | /* We come here if we hit a breakpoint but should not |
2299 | stop for it. Possibly we also were stepping | |
2300 | and should stop for that. So fall through and | |
2301 | test for stepping. But, if not stepping, | |
2302 | do not stop. */ | |
c906108c | 2303 | |
9d1ff73f MS |
2304 | /* Are we stepping to get the inferior out of the dynamic linker's |
2305 | hook (and possibly the dld itself) after catching a shlib | |
2306 | event? */ | |
488f131b JB |
2307 | if (ecs->stepping_through_solib_after_catch) |
2308 | { | |
2309 | #if defined(SOLIB_ADD) | |
2310 | /* Have we reached our destination? If not, keep going. */ | |
2311 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2312 | { | |
527159b7 | 2313 | if (debug_infrun) |
8a9de0e4 | 2314 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
488f131b JB |
2315 | ecs->another_trap = 1; |
2316 | keep_going (ecs); | |
104c1213 | 2317 | return; |
488f131b JB |
2318 | } |
2319 | #endif | |
527159b7 | 2320 | if (debug_infrun) |
8a9de0e4 | 2321 | fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
488f131b JB |
2322 | /* Else, stop and report the catchpoint(s) whose triggering |
2323 | caused us to begin stepping. */ | |
2324 | ecs->stepping_through_solib_after_catch = 0; | |
2325 | bpstat_clear (&stop_bpstat); | |
2326 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2327 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2328 | stop_print_frame = 1; | |
2329 | stop_stepping (ecs); | |
2330 | return; | |
2331 | } | |
c906108c | 2332 | |
488f131b JB |
2333 | if (step_resume_breakpoint) |
2334 | { | |
527159b7 | 2335 | if (debug_infrun) |
d3169d93 DJ |
2336 | fprintf_unfiltered (gdb_stdlog, |
2337 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 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 | 2348 | if (debug_infrun) |
8a9de0e4 | 2349 | fprintf_unfiltered (gdb_stdlog, "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 | 2362 | if (debug_infrun) |
8a9de0e4 | 2363 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n", |
527159b7 RC |
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 | |
a77053c2 MK |
2377 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE |
2378 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc) | |
2379 | #else | |
2380 | && in_solib_dynsym_resolve_code (stop_pc) | |
2381 | #endif | |
2382 | ) | |
488f131b | 2383 | { |
4c8c40e6 MK |
2384 | CORE_ADDR pc_after_resolver = |
2385 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2386 | |
527159b7 | 2387 | if (debug_infrun) |
8a9de0e4 | 2388 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
527159b7 | 2389 | |
488f131b JB |
2390 | if (pc_after_resolver) |
2391 | { | |
2392 | /* Set up a step-resume breakpoint at the address | |
2393 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2394 | struct symtab_and_line sr_sal; | |
fe39c653 | 2395 | init_sal (&sr_sal); |
488f131b JB |
2396 | sr_sal.pc = pc_after_resolver; |
2397 | ||
44cbf7b5 | 2398 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c5aa993b | 2399 | } |
c906108c | 2400 | |
488f131b JB |
2401 | keep_going (ecs); |
2402 | return; | |
2403 | } | |
c906108c | 2404 | |
42edda50 AC |
2405 | if (step_range_end != 1 |
2406 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2407 | || step_over_calls == STEP_OVER_ALL) | |
2408 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 2409 | { |
527159b7 | 2410 | if (debug_infrun) |
8a9de0e4 | 2411 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
42edda50 | 2412 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
2413 | a signal trampoline (either by a signal being delivered or by |
2414 | the signal handler returning). Just single-step until the | |
2415 | inferior leaves the trampoline (either by calling the handler | |
2416 | or returning). */ | |
488f131b JB |
2417 | keep_going (ecs); |
2418 | return; | |
2419 | } | |
c906108c | 2420 | |
c17eaafe DJ |
2421 | /* Check for subroutine calls. The check for the current frame |
2422 | equalling the step ID is not necessary - the check of the | |
2423 | previous frame's ID is sufficient - but it is a common case and | |
2424 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
2425 | |
2426 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
2427 | being equal, so to get into this block, both the current and | |
2428 | previous frame must have valid frame IDs. */ | |
c17eaafe DJ |
2429 | if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id) |
2430 | && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) | |
488f131b | 2431 | { |
95918acb | 2432 | CORE_ADDR real_stop_pc; |
8fb3e588 | 2433 | |
527159b7 | 2434 | if (debug_infrun) |
8a9de0e4 | 2435 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 2436 | |
95918acb AC |
2437 | if ((step_over_calls == STEP_OVER_NONE) |
2438 | || ((step_range_end == 1) | |
2439 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2440 | { | |
2441 | /* I presume that step_over_calls is only 0 when we're | |
2442 | supposed to be stepping at the assembly language level | |
2443 | ("stepi"). Just stop. */ | |
2444 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
2445 | thought it was a subroutine call but it was not. Stop as | |
2446 | well. FENN */ | |
2447 | stop_step = 1; | |
2448 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2449 | stop_stepping (ecs); | |
2450 | return; | |
2451 | } | |
8fb3e588 | 2452 | |
8567c30f AC |
2453 | if (step_over_calls == STEP_OVER_ALL) |
2454 | { | |
2455 | /* We're doing a "next", set a breakpoint at callee's return | |
2456 | address (the address at which the caller will | |
2457 | resume). */ | |
14e60db5 | 2458 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
8567c30f AC |
2459 | keep_going (ecs); |
2460 | return; | |
2461 | } | |
a53c66de | 2462 | |
95918acb | 2463 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
2464 | calling routine and the real function), locate the real |
2465 | function. That's what tells us (a) whether we want to step | |
2466 | into it at all, and (b) what prologue we want to run to the | |
2467 | end of, if we do step into it. */ | |
52f729a7 | 2468 | real_stop_pc = skip_language_trampoline (get_current_frame (), stop_pc); |
95918acb | 2469 | if (real_stop_pc == 0) |
52f729a7 UW |
2470 | real_stop_pc = gdbarch_skip_trampoline_code |
2471 | (current_gdbarch, get_current_frame (), stop_pc); | |
95918acb AC |
2472 | if (real_stop_pc != 0) |
2473 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 2474 | |
a77053c2 MK |
2475 | if ( |
2476 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
2477 | IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start) | |
2478 | #else | |
2479 | in_solib_dynsym_resolve_code (ecs->stop_func_start) | |
2480 | #endif | |
2481 | ) | |
1b2bfbb9 RC |
2482 | { |
2483 | struct symtab_and_line sr_sal; | |
2484 | init_sal (&sr_sal); | |
2485 | sr_sal.pc = ecs->stop_func_start; | |
2486 | ||
44cbf7b5 | 2487 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
8fb3e588 AC |
2488 | keep_going (ecs); |
2489 | return; | |
1b2bfbb9 RC |
2490 | } |
2491 | ||
95918acb | 2492 | /* If we have line number information for the function we are |
8fb3e588 | 2493 | thinking of stepping into, step into it. |
95918acb | 2494 | |
8fb3e588 AC |
2495 | If there are several symtabs at that PC (e.g. with include |
2496 | files), just want to know whether *any* of them have line | |
2497 | numbers. find_pc_line handles this. */ | |
95918acb AC |
2498 | { |
2499 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 2500 | |
95918acb AC |
2501 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2502 | if (tmp_sal.line != 0) | |
2503 | { | |
2504 | step_into_function (ecs); | |
2505 | return; | |
2506 | } | |
2507 | } | |
2508 | ||
2509 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
2510 | set, we stop the step so that the user has a chance to switch |
2511 | in assembly mode. */ | |
95918acb AC |
2512 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
2513 | { | |
2514 | stop_step = 1; | |
2515 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2516 | stop_stepping (ecs); | |
2517 | return; | |
2518 | } | |
2519 | ||
2520 | /* Set a breakpoint at callee's return address (the address at | |
8fb3e588 | 2521 | which the caller will resume). */ |
14e60db5 | 2522 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
95918acb | 2523 | keep_going (ecs); |
488f131b | 2524 | return; |
488f131b | 2525 | } |
c906108c | 2526 | |
488f131b JB |
2527 | /* If we're in the return path from a shared library trampoline, |
2528 | we want to proceed through the trampoline when stepping. */ | |
e76f05fa UW |
2529 | if (gdbarch_in_solib_return_trampoline (current_gdbarch, |
2530 | stop_pc, ecs->stop_func_name)) | |
488f131b | 2531 | { |
488f131b | 2532 | /* Determine where this trampoline returns. */ |
52f729a7 UW |
2533 | CORE_ADDR real_stop_pc; |
2534 | real_stop_pc = gdbarch_skip_trampoline_code | |
2535 | (current_gdbarch, get_current_frame (), stop_pc); | |
c906108c | 2536 | |
527159b7 | 2537 | if (debug_infrun) |
8a9de0e4 | 2538 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
527159b7 | 2539 | |
488f131b | 2540 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2541 | if (real_stop_pc) |
488f131b JB |
2542 | { |
2543 | /* And put the step-breakpoint there and go until there. */ | |
2544 | struct symtab_and_line sr_sal; | |
2545 | ||
fe39c653 | 2546 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2547 | sr_sal.pc = real_stop_pc; |
488f131b | 2548 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
44cbf7b5 AC |
2549 | |
2550 | /* Do not specify what the fp should be when we stop since | |
2551 | on some machines the prologue is where the new fp value | |
2552 | is established. */ | |
2553 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
c906108c | 2554 | |
488f131b JB |
2555 | /* Restart without fiddling with the step ranges or |
2556 | other state. */ | |
2557 | keep_going (ecs); | |
2558 | return; | |
2559 | } | |
2560 | } | |
c906108c | 2561 | |
7ed0fe66 DJ |
2562 | ecs->sal = find_pc_line (stop_pc, 0); |
2563 | ||
1b2bfbb9 RC |
2564 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
2565 | the trampoline processing logic, however, there are some trampolines | |
2566 | that have no names, so we should do trampoline handling first. */ | |
2567 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
7ed0fe66 DJ |
2568 | && ecs->stop_func_name == NULL |
2569 | && ecs->sal.line == 0) | |
1b2bfbb9 | 2570 | { |
527159b7 | 2571 | if (debug_infrun) |
8a9de0e4 | 2572 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
527159b7 | 2573 | |
1b2bfbb9 | 2574 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
2575 | undebuggable function (where there is no debugging information |
2576 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
2577 | inferior stopped). Since we want to skip this kind of code, |
2578 | we keep going until the inferior returns from this | |
14e60db5 DJ |
2579 | function - unless the user has asked us not to (via |
2580 | set step-mode) or we no longer know how to get back | |
2581 | to the call site. */ | |
2582 | if (step_stop_if_no_debug | |
2583 | || !frame_id_p (frame_unwind_id (get_current_frame ()))) | |
1b2bfbb9 RC |
2584 | { |
2585 | /* If we have no line number and the step-stop-if-no-debug | |
2586 | is set, we stop the step so that the user has a chance to | |
2587 | switch in assembly mode. */ | |
2588 | stop_step = 1; | |
2589 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2590 | stop_stepping (ecs); | |
2591 | return; | |
2592 | } | |
2593 | else | |
2594 | { | |
2595 | /* Set a breakpoint at callee's return address (the address | |
2596 | at which the caller will resume). */ | |
14e60db5 | 2597 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
1b2bfbb9 RC |
2598 | keep_going (ecs); |
2599 | return; | |
2600 | } | |
2601 | } | |
2602 | ||
2603 | if (step_range_end == 1) | |
2604 | { | |
2605 | /* It is stepi or nexti. We always want to stop stepping after | |
2606 | one instruction. */ | |
527159b7 | 2607 | if (debug_infrun) |
8a9de0e4 | 2608 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
1b2bfbb9 RC |
2609 | stop_step = 1; |
2610 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2611 | stop_stepping (ecs); | |
2612 | return; | |
2613 | } | |
2614 | ||
488f131b JB |
2615 | if (ecs->sal.line == 0) |
2616 | { | |
2617 | /* We have no line number information. That means to stop | |
2618 | stepping (does this always happen right after one instruction, | |
2619 | when we do "s" in a function with no line numbers, | |
2620 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 2621 | if (debug_infrun) |
8a9de0e4 | 2622 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
488f131b JB |
2623 | stop_step = 1; |
2624 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2625 | stop_stepping (ecs); | |
2626 | return; | |
2627 | } | |
c906108c | 2628 | |
488f131b JB |
2629 | if ((stop_pc == ecs->sal.pc) |
2630 | && (ecs->current_line != ecs->sal.line | |
2631 | || ecs->current_symtab != ecs->sal.symtab)) | |
2632 | { | |
2633 | /* We are at the start of a different line. So stop. Note that | |
2634 | we don't stop if we step into the middle of a different line. | |
2635 | That is said to make things like for (;;) statements work | |
2636 | better. */ | |
527159b7 | 2637 | if (debug_infrun) |
8a9de0e4 | 2638 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
488f131b JB |
2639 | stop_step = 1; |
2640 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2641 | stop_stepping (ecs); | |
2642 | return; | |
2643 | } | |
c906108c | 2644 | |
488f131b | 2645 | /* We aren't done stepping. |
c906108c | 2646 | |
488f131b JB |
2647 | Optimize by setting the stepping range to the line. |
2648 | (We might not be in the original line, but if we entered a | |
2649 | new line in mid-statement, we continue stepping. This makes | |
2650 | things like for(;;) statements work better.) */ | |
c906108c | 2651 | |
488f131b | 2652 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2653 | { |
488f131b JB |
2654 | /* If this is the last line of the function, don't keep stepping |
2655 | (it would probably step us out of the function). | |
2656 | This is particularly necessary for a one-line function, | |
2657 | in which after skipping the prologue we better stop even though | |
2658 | we will be in mid-line. */ | |
527159b7 | 2659 | if (debug_infrun) |
8a9de0e4 | 2660 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n"); |
488f131b JB |
2661 | stop_step = 1; |
2662 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2663 | stop_stepping (ecs); | |
2664 | return; | |
c5aa993b | 2665 | } |
488f131b JB |
2666 | step_range_start = ecs->sal.pc; |
2667 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2668 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2669 | ecs->current_line = ecs->sal.line; |
2670 | ecs->current_symtab = ecs->sal.symtab; | |
2671 | ||
aa0cd9c1 AC |
2672 | /* In the case where we just stepped out of a function into the |
2673 | middle of a line of the caller, continue stepping, but | |
2674 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2675 | #if 0 |
2676 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2677 | generous. It will trigger on things like a step into a frameless | |
2678 | stackless leaf function. I think the logic should instead look | |
2679 | at the unwound frame ID has that should give a more robust | |
2680 | indication of what happened. */ | |
8fb3e588 AC |
2681 | if (step - ID == current - ID) |
2682 | still stepping in same function; | |
2683 | else if (step - ID == unwind (current - ID)) | |
2684 | stepped into a function; | |
2685 | else | |
2686 | stepped out of a function; | |
2687 | /* Of course this assumes that the frame ID unwind code is robust | |
2688 | and we're willing to introduce frame unwind logic into this | |
2689 | function. Fortunately, those days are nearly upon us. */ | |
65815ea1 | 2690 | #endif |
488f131b | 2691 | { |
aa0cd9c1 AC |
2692 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2693 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2694 | step_frame_id = current_frame; | |
488f131b | 2695 | } |
c906108c | 2696 | |
527159b7 | 2697 | if (debug_infrun) |
8a9de0e4 | 2698 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 2699 | keep_going (ecs); |
104c1213 JM |
2700 | } |
2701 | ||
2702 | /* Are we in the middle of stepping? */ | |
2703 | ||
2704 | static int | |
2705 | currently_stepping (struct execution_control_state *ecs) | |
2706 | { | |
d303a6c7 | 2707 | return ((!ecs->handling_longjmp |
104c1213 JM |
2708 | && ((step_range_end && step_resume_breakpoint == NULL) |
2709 | || trap_expected)) | |
2710 | || ecs->stepping_through_solib_after_catch | |
2711 | || bpstat_should_step ()); | |
2712 | } | |
c906108c | 2713 | |
c2c6d25f JM |
2714 | /* Subroutine call with source code we should not step over. Do step |
2715 | to the first line of code in it. */ | |
2716 | ||
2717 | static void | |
2718 | step_into_function (struct execution_control_state *ecs) | |
2719 | { | |
2720 | struct symtab *s; | |
2721 | struct symtab_and_line sr_sal; | |
2722 | ||
2723 | s = find_pc_symtab (stop_pc); | |
2724 | if (s && s->language != language_asm) | |
a433963d UW |
2725 | ecs->stop_func_start = gdbarch_skip_prologue |
2726 | (current_gdbarch, ecs->stop_func_start); | |
c2c6d25f JM |
2727 | |
2728 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2729 | /* Use the step_resume_break to step until the end of the prologue, | |
2730 | even if that involves jumps (as it seems to on the vax under | |
2731 | 4.2). */ | |
2732 | /* If the prologue ends in the middle of a source line, continue to | |
2733 | the end of that source line (if it is still within the function). | |
2734 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2735 | if (ecs->sal.end |
2736 | && ecs->sal.pc != ecs->stop_func_start | |
2737 | && ecs->sal.end < ecs->stop_func_end) | |
2738 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2739 | |
2dbd5e30 KB |
2740 | /* Architectures which require breakpoint adjustment might not be able |
2741 | to place a breakpoint at the computed address. If so, the test | |
2742 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2743 | ecs->stop_func_start to an address at which a breakpoint may be | |
2744 | legitimately placed. | |
8fb3e588 | 2745 | |
2dbd5e30 KB |
2746 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
2747 | made, GDB will enter an infinite loop when stepping through | |
2748 | optimized code consisting of VLIW instructions which contain | |
2749 | subinstructions corresponding to different source lines. On | |
2750 | FR-V, it's not permitted to place a breakpoint on any but the | |
2751 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2752 | set, GDB will adjust the breakpoint address to the beginning of | |
2753 | the VLIW instruction. Thus, we need to make the corresponding | |
2754 | adjustment here when computing the stop address. */ | |
8fb3e588 | 2755 | |
2dbd5e30 KB |
2756 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
2757 | { | |
2758 | ecs->stop_func_start | |
2759 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
8fb3e588 | 2760 | ecs->stop_func_start); |
2dbd5e30 KB |
2761 | } |
2762 | ||
c2c6d25f JM |
2763 | if (ecs->stop_func_start == stop_pc) |
2764 | { | |
2765 | /* We are already there: stop now. */ | |
2766 | stop_step = 1; | |
488f131b | 2767 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2768 | stop_stepping (ecs); |
2769 | return; | |
2770 | } | |
2771 | else | |
2772 | { | |
2773 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2774 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2775 | sr_sal.pc = ecs->stop_func_start; |
2776 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
44cbf7b5 | 2777 | |
c2c6d25f | 2778 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
2779 | some machines the prologue is where the new fp value is |
2780 | established. */ | |
44cbf7b5 | 2781 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c2c6d25f JM |
2782 | |
2783 | /* And make sure stepping stops right away then. */ | |
2784 | step_range_end = step_range_start; | |
2785 | } | |
2786 | keep_going (ecs); | |
2787 | } | |
d4f3574e | 2788 | |
d3169d93 | 2789 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
2790 | This is used to both functions and to skip over code. */ |
2791 | ||
2792 | static void | |
2793 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
2794 | struct frame_id sr_id) | |
2795 | { | |
2796 | /* There should never be more than one step-resume breakpoint per | |
2797 | thread, so we should never be setting a new | |
2798 | step_resume_breakpoint when one is already active. */ | |
2799 | gdb_assert (step_resume_breakpoint == NULL); | |
d3169d93 DJ |
2800 | |
2801 | if (debug_infrun) | |
2802 | fprintf_unfiltered (gdb_stdlog, | |
2803 | "infrun: inserting step-resume breakpoint at 0x%s\n", | |
2804 | paddr_nz (sr_sal.pc)); | |
2805 | ||
44cbf7b5 AC |
2806 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, |
2807 | bp_step_resume); | |
2808 | if (breakpoints_inserted) | |
2809 | insert_breakpoints (); | |
2810 | } | |
7ce450bd | 2811 | |
d3169d93 | 2812 | /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used |
14e60db5 | 2813 | to skip a potential signal handler. |
7ce450bd | 2814 | |
14e60db5 DJ |
2815 | This is called with the interrupted function's frame. The signal |
2816 | handler, when it returns, will resume the interrupted function at | |
2817 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
2818 | |
2819 | static void | |
44cbf7b5 | 2820 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
2821 | { |
2822 | struct symtab_and_line sr_sal; | |
2823 | ||
d303a6c7 AC |
2824 | init_sal (&sr_sal); /* initialize to zeros */ |
2825 | ||
bf6ae464 UW |
2826 | sr_sal.pc = gdbarch_addr_bits_remove |
2827 | (current_gdbarch, get_frame_pc (return_frame)); | |
d303a6c7 AC |
2828 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2829 | ||
44cbf7b5 | 2830 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
d303a6c7 AC |
2831 | } |
2832 | ||
14e60db5 DJ |
2833 | /* Similar to insert_step_resume_breakpoint_at_frame, except |
2834 | but a breakpoint at the previous frame's PC. This is used to | |
2835 | skip a function after stepping into it (for "next" or if the called | |
2836 | function has no debugging information). | |
2837 | ||
2838 | The current function has almost always been reached by single | |
2839 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
2840 | current function, and the breakpoint will be set at the caller's | |
2841 | resume address. | |
2842 | ||
2843 | This is a separate function rather than reusing | |
2844 | insert_step_resume_breakpoint_at_frame in order to avoid | |
2845 | get_prev_frame, which may stop prematurely (see the implementation | |
2846 | of frame_unwind_id for an example). */ | |
2847 | ||
2848 | static void | |
2849 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
2850 | { | |
2851 | struct symtab_and_line sr_sal; | |
2852 | ||
2853 | /* We shouldn't have gotten here if we don't know where the call site | |
2854 | is. */ | |
2855 | gdb_assert (frame_id_p (frame_unwind_id (next_frame))); | |
2856 | ||
2857 | init_sal (&sr_sal); /* initialize to zeros */ | |
2858 | ||
bf6ae464 UW |
2859 | sr_sal.pc = gdbarch_addr_bits_remove |
2860 | (current_gdbarch, frame_pc_unwind (next_frame)); | |
14e60db5 DJ |
2861 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2862 | ||
2863 | insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame)); | |
2864 | } | |
2865 | ||
104c1213 JM |
2866 | static void |
2867 | stop_stepping (struct execution_control_state *ecs) | |
2868 | { | |
527159b7 | 2869 | if (debug_infrun) |
8a9de0e4 | 2870 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 2871 | |
cd0fc7c3 SS |
2872 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2873 | ecs->wait_some_more = 0; | |
2874 | } | |
2875 | ||
d4f3574e SS |
2876 | /* This function handles various cases where we need to continue |
2877 | waiting for the inferior. */ | |
2878 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2879 | ||
2880 | static void | |
2881 | keep_going (struct execution_control_state *ecs) | |
2882 | { | |
d4f3574e | 2883 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2884 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 2885 | |
d4f3574e SS |
2886 | /* If we did not do break;, it means we should keep running the |
2887 | inferior and not return to debugger. */ | |
2888 | ||
2889 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2890 | { | |
2891 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2892 | the inferior, else we'd have done a break above) and we |
2893 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2894 | resume (currently_stepping (ecs), stop_signal); |
2895 | } | |
2896 | else | |
2897 | { | |
2898 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2899 | anyway (the user asked that this signal be passed to the |
2900 | child) | |
2901 | -- or -- | |
2902 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2903 | decided we should resume from it. | |
d4f3574e | 2904 | |
68f53502 | 2905 | We're going to run this baby now! */ |
d4f3574e | 2906 | |
68f53502 | 2907 | if (!breakpoints_inserted && !ecs->another_trap) |
d4f3574e | 2908 | { |
569631c6 UW |
2909 | /* Stop stepping when inserting breakpoints |
2910 | has failed. */ | |
2911 | if (insert_breakpoints () != 0) | |
d4f3574e SS |
2912 | { |
2913 | stop_stepping (ecs); | |
2914 | return; | |
2915 | } | |
2916 | breakpoints_inserted = 1; | |
2917 | } | |
2918 | ||
2919 | trap_expected = ecs->another_trap; | |
2920 | ||
2921 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2922 | specifies that such a signal should be delivered to the |
2923 | target program). | |
2924 | ||
2925 | Typically, this would occure when a user is debugging a | |
2926 | target monitor on a simulator: the target monitor sets a | |
2927 | breakpoint; the simulator encounters this break-point and | |
2928 | halts the simulation handing control to GDB; GDB, noteing | |
2929 | that the break-point isn't valid, returns control back to the | |
2930 | simulator; the simulator then delivers the hardware | |
2931 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2932 | ||
2933 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2934 | stop_signal = TARGET_SIGNAL_0; |
2935 | ||
d4f3574e SS |
2936 | |
2937 | resume (currently_stepping (ecs), stop_signal); | |
2938 | } | |
2939 | ||
488f131b | 2940 | prepare_to_wait (ecs); |
d4f3574e SS |
2941 | } |
2942 | ||
104c1213 JM |
2943 | /* This function normally comes after a resume, before |
2944 | handle_inferior_event exits. It takes care of any last bits of | |
2945 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2946 | |
104c1213 JM |
2947 | static void |
2948 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2949 | { |
527159b7 | 2950 | if (debug_infrun) |
8a9de0e4 | 2951 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 JM |
2952 | if (ecs->infwait_state == infwait_normal_state) |
2953 | { | |
2954 | overlay_cache_invalid = 1; | |
2955 | ||
2956 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2957 | target_wait because they can be loaded from the target while |
2958 | in target_wait. This makes remote debugging a bit more | |
2959 | efficient for those targets that provide critical registers | |
2960 | as part of their normal status mechanism. */ | |
104c1213 JM |
2961 | |
2962 | registers_changed (); | |
39f77062 | 2963 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2964 | ecs->wp = &(ecs->ws); |
2965 | } | |
2966 | /* This is the old end of the while loop. Let everybody know we | |
2967 | want to wait for the inferior some more and get called again | |
2968 | soon. */ | |
2969 | ecs->wait_some_more = 1; | |
c906108c | 2970 | } |
11cf8741 JM |
2971 | |
2972 | /* Print why the inferior has stopped. We always print something when | |
2973 | the inferior exits, or receives a signal. The rest of the cases are | |
2974 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2975 | there should be a call to this function from handle_inferior_event() | |
2976 | each time stop_stepping() is called.*/ | |
2977 | static void | |
2978 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2979 | { | |
2980 | switch (stop_reason) | |
2981 | { | |
11cf8741 JM |
2982 | case END_STEPPING_RANGE: |
2983 | /* We are done with a step/next/si/ni command. */ | |
2984 | /* For now print nothing. */ | |
fb40c209 | 2985 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2986 | operation for n > 1 */ |
fb40c209 | 2987 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2988 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
2989 | ui_out_field_string |
2990 | (uiout, "reason", | |
2991 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
11cf8741 | 2992 | break; |
11cf8741 JM |
2993 | case SIGNAL_EXITED: |
2994 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2995 | annotate_signalled (); |
9dc5e2a9 | 2996 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
2997 | ui_out_field_string |
2998 | (uiout, "reason", | |
2999 | async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8b93c638 JM |
3000 | ui_out_text (uiout, "\nProgram terminated with signal "); |
3001 | annotate_signal_name (); | |
488f131b JB |
3002 | ui_out_field_string (uiout, "signal-name", |
3003 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3004 | annotate_signal_name_end (); |
3005 | ui_out_text (uiout, ", "); | |
3006 | annotate_signal_string (); | |
488f131b JB |
3007 | ui_out_field_string (uiout, "signal-meaning", |
3008 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3009 | annotate_signal_string_end (); |
3010 | ui_out_text (uiout, ".\n"); | |
3011 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
3012 | break; |
3013 | case EXITED: | |
3014 | /* The inferior program is finished. */ | |
8b93c638 JM |
3015 | annotate_exited (stop_info); |
3016 | if (stop_info) | |
3017 | { | |
9dc5e2a9 | 3018 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3019 | ui_out_field_string (uiout, "reason", |
3020 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
8b93c638 | 3021 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
3022 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
3023 | (unsigned int) stop_info); | |
8b93c638 JM |
3024 | ui_out_text (uiout, ".\n"); |
3025 | } | |
3026 | else | |
3027 | { | |
9dc5e2a9 | 3028 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3029 | ui_out_field_string |
3030 | (uiout, "reason", | |
3031 | async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
8b93c638 JM |
3032 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
3033 | } | |
f17517ea AS |
3034 | /* Support the --return-child-result option. */ |
3035 | return_child_result_value = stop_info; | |
11cf8741 JM |
3036 | break; |
3037 | case SIGNAL_RECEIVED: | |
3038 | /* Signal received. The signal table tells us to print about | |
3039 | it. */ | |
8b93c638 JM |
3040 | annotate_signal (); |
3041 | ui_out_text (uiout, "\nProgram received signal "); | |
3042 | annotate_signal_name (); | |
84c6c83c | 3043 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3044 | ui_out_field_string |
3045 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b JB |
3046 | ui_out_field_string (uiout, "signal-name", |
3047 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3048 | annotate_signal_name_end (); |
3049 | ui_out_text (uiout, ", "); | |
3050 | annotate_signal_string (); | |
488f131b JB |
3051 | ui_out_field_string (uiout, "signal-meaning", |
3052 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3053 | annotate_signal_string_end (); |
3054 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
3055 | break; |
3056 | default: | |
8e65ff28 | 3057 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 3058 | _("print_stop_reason: unrecognized enum value")); |
11cf8741 JM |
3059 | break; |
3060 | } | |
3061 | } | |
c906108c | 3062 | \f |
43ff13b4 | 3063 | |
c906108c SS |
3064 | /* Here to return control to GDB when the inferior stops for real. |
3065 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3066 | ||
3067 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3068 | (pc, function, args, file, line number and line text). | |
3069 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3070 | attempting to insert breakpoints. */ | |
3071 | ||
3072 | void | |
96baa820 | 3073 | normal_stop (void) |
c906108c | 3074 | { |
73b65bb0 DJ |
3075 | struct target_waitstatus last; |
3076 | ptid_t last_ptid; | |
3077 | ||
3078 | get_last_target_status (&last_ptid, &last); | |
3079 | ||
c906108c SS |
3080 | /* As with the notification of thread events, we want to delay |
3081 | notifying the user that we've switched thread context until | |
3082 | the inferior actually stops. | |
3083 | ||
73b65bb0 DJ |
3084 | There's no point in saying anything if the inferior has exited. |
3085 | Note that SIGNALLED here means "exited with a signal", not | |
3086 | "received a signal". */ | |
488f131b | 3087 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
3088 | && target_has_execution |
3089 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
3090 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
3091 | { |
3092 | target_terminal_ours_for_output (); | |
a3f17187 | 3093 | printf_filtered (_("[Switching to %s]\n"), |
39f77062 KB |
3094 | target_pid_or_tid_to_str (inferior_ptid)); |
3095 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 3096 | } |
c906108c | 3097 | |
4fa8626c | 3098 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
3099 | /* Make sure that the current_frame's pc is correct. This |
3100 | is a correction for setting up the frame info before doing | |
b798847d | 3101 | gdbarch_decr_pc_after_break */ |
b87efeee AC |
3102 | if (target_has_execution) |
3103 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
b798847d | 3104 | gdbarch_decr_pc_after_break, the program counter can change. Ask the |
b87efeee | 3105 | frame code to check for this and sort out any resultant mess. |
b798847d | 3106 | gdbarch_decr_pc_after_break needs to just go away. */ |
2f107107 | 3107 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 3108 | |
c906108c SS |
3109 | if (target_has_execution && breakpoints_inserted) |
3110 | { | |
3111 | if (remove_breakpoints ()) | |
3112 | { | |
3113 | target_terminal_ours_for_output (); | |
a3f17187 AC |
3114 | printf_filtered (_("\ |
3115 | Cannot remove breakpoints because program is no longer writable.\n\ | |
3116 | It might be running in another process.\n\ | |
3117 | Further execution is probably impossible.\n")); | |
c906108c SS |
3118 | } |
3119 | } | |
3120 | breakpoints_inserted = 0; | |
3121 | ||
3122 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3123 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3124 | ||
3125 | breakpoint_auto_delete (stop_bpstat); | |
3126 | ||
3127 | /* If an auto-display called a function and that got a signal, | |
3128 | delete that auto-display to avoid an infinite recursion. */ | |
3129 | ||
3130 | if (stopped_by_random_signal) | |
3131 | disable_current_display (); | |
3132 | ||
3133 | /* Don't print a message if in the middle of doing a "step n" | |
3134 | operation for n > 1 */ | |
3135 | if (step_multi && stop_step) | |
3136 | goto done; | |
3137 | ||
3138 | target_terminal_ours (); | |
3139 | ||
7abfe014 DJ |
3140 | /* Set the current source location. This will also happen if we |
3141 | display the frame below, but the current SAL will be incorrect | |
3142 | during a user hook-stop function. */ | |
3143 | if (target_has_stack && !stop_stack_dummy) | |
3144 | set_current_sal_from_frame (get_current_frame (), 1); | |
3145 | ||
5913bcb0 AC |
3146 | /* Look up the hook_stop and run it (CLI internally handles problem |
3147 | of stop_command's pre-hook not existing). */ | |
3148 | if (stop_command) | |
3149 | catch_errors (hook_stop_stub, stop_command, | |
3150 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3151 | |
3152 | if (!target_has_stack) | |
3153 | { | |
3154 | ||
3155 | goto done; | |
3156 | } | |
3157 | ||
3158 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3159 | and current location is based on that. | |
3160 | Don't do this on return from a stack dummy routine, | |
3161 | or if the program has exited. */ | |
3162 | ||
3163 | if (!stop_stack_dummy) | |
3164 | { | |
0f7d239c | 3165 | select_frame (get_current_frame ()); |
c906108c SS |
3166 | |
3167 | /* Print current location without a level number, if | |
c5aa993b JM |
3168 | we have changed functions or hit a breakpoint. |
3169 | Print source line if we have one. | |
3170 | bpstat_print() contains the logic deciding in detail | |
3171 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3172 | |
206415a3 | 3173 | if (stop_print_frame) |
c906108c SS |
3174 | { |
3175 | int bpstat_ret; | |
3176 | int source_flag; | |
917317f4 | 3177 | int do_frame_printing = 1; |
c906108c SS |
3178 | |
3179 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3180 | switch (bpstat_ret) |
3181 | { | |
3182 | case PRINT_UNKNOWN: | |
aa0cd9c1 | 3183 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
3184 | (or should) carry around the function and does (or |
3185 | should) use that when doing a frame comparison. */ | |
917317f4 | 3186 | if (stop_step |
aa0cd9c1 AC |
3187 | && frame_id_eq (step_frame_id, |
3188 | get_frame_id (get_current_frame ())) | |
917317f4 | 3189 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3190 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3191 | else |
488f131b | 3192 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3193 | break; |
3194 | case PRINT_SRC_AND_LOC: | |
488f131b | 3195 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3196 | break; |
3197 | case PRINT_SRC_ONLY: | |
c5394b80 | 3198 | source_flag = SRC_LINE; |
917317f4 JM |
3199 | break; |
3200 | case PRINT_NOTHING: | |
488f131b | 3201 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3202 | do_frame_printing = 0; |
3203 | break; | |
3204 | default: | |
e2e0b3e5 | 3205 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 3206 | } |
c906108c | 3207 | |
9dc5e2a9 | 3208 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3209 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3210 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3211 | /* The behavior of this routine with respect to the source |
3212 | flag is: | |
c5394b80 JM |
3213 | SRC_LINE: Print only source line |
3214 | LOCATION: Print only location | |
3215 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3216 | if (do_frame_printing) |
b04f3ab4 | 3217 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
3218 | |
3219 | /* Display the auto-display expressions. */ | |
3220 | do_displays (); | |
3221 | } | |
3222 | } | |
3223 | ||
3224 | /* Save the function value return registers, if we care. | |
3225 | We might be about to restore their previous contents. */ | |
3226 | if (proceed_to_finish) | |
d5c31457 UW |
3227 | { |
3228 | /* This should not be necessary. */ | |
3229 | if (stop_registers) | |
3230 | regcache_xfree (stop_registers); | |
3231 | ||
3232 | /* NB: The copy goes through to the target picking up the value of | |
3233 | all the registers. */ | |
3234 | stop_registers = regcache_dup (get_current_regcache ()); | |
3235 | } | |
c906108c SS |
3236 | |
3237 | if (stop_stack_dummy) | |
3238 | { | |
dbe9fe58 AC |
3239 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3240 | ends with a setting of the current frame, so we can use that | |
3241 | next. */ | |
3242 | frame_pop (get_current_frame ()); | |
c906108c | 3243 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3244 | Can't rely on restore_inferior_status because that only gets |
3245 | called if we don't stop in the called function. */ | |
c906108c | 3246 | stop_pc = read_pc (); |
0f7d239c | 3247 | select_frame (get_current_frame ()); |
c906108c SS |
3248 | } |
3249 | ||
c906108c SS |
3250 | done: |
3251 | annotate_stopped (); | |
7a464420 | 3252 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3253 | } |
3254 | ||
3255 | static int | |
96baa820 | 3256 | hook_stop_stub (void *cmd) |
c906108c | 3257 | { |
5913bcb0 | 3258 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3259 | return (0); |
3260 | } | |
3261 | \f | |
c5aa993b | 3262 | int |
96baa820 | 3263 | signal_stop_state (int signo) |
c906108c SS |
3264 | { |
3265 | return signal_stop[signo]; | |
3266 | } | |
3267 | ||
c5aa993b | 3268 | int |
96baa820 | 3269 | signal_print_state (int signo) |
c906108c SS |
3270 | { |
3271 | return signal_print[signo]; | |
3272 | } | |
3273 | ||
c5aa993b | 3274 | int |
96baa820 | 3275 | signal_pass_state (int signo) |
c906108c SS |
3276 | { |
3277 | return signal_program[signo]; | |
3278 | } | |
3279 | ||
488f131b | 3280 | int |
7bda5e4a | 3281 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3282 | { |
3283 | int ret = signal_stop[signo]; | |
3284 | signal_stop[signo] = state; | |
3285 | return ret; | |
3286 | } | |
3287 | ||
488f131b | 3288 | int |
7bda5e4a | 3289 | signal_print_update (int signo, int state) |
d4f3574e SS |
3290 | { |
3291 | int ret = signal_print[signo]; | |
3292 | signal_print[signo] = state; | |
3293 | return ret; | |
3294 | } | |
3295 | ||
488f131b | 3296 | int |
7bda5e4a | 3297 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3298 | { |
3299 | int ret = signal_program[signo]; | |
3300 | signal_program[signo] = state; | |
3301 | return ret; | |
3302 | } | |
3303 | ||
c906108c | 3304 | static void |
96baa820 | 3305 | sig_print_header (void) |
c906108c | 3306 | { |
a3f17187 AC |
3307 | printf_filtered (_("\ |
3308 | Signal Stop\tPrint\tPass to program\tDescription\n")); | |
c906108c SS |
3309 | } |
3310 | ||
3311 | static void | |
96baa820 | 3312 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3313 | { |
3314 | char *name = target_signal_to_name (oursig); | |
3315 | int name_padding = 13 - strlen (name); | |
96baa820 | 3316 | |
c906108c SS |
3317 | if (name_padding <= 0) |
3318 | name_padding = 0; | |
3319 | ||
3320 | printf_filtered ("%s", name); | |
488f131b | 3321 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3322 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3323 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3324 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3325 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3326 | } | |
3327 | ||
3328 | /* Specify how various signals in the inferior should be handled. */ | |
3329 | ||
3330 | static void | |
96baa820 | 3331 | handle_command (char *args, int from_tty) |
c906108c SS |
3332 | { |
3333 | char **argv; | |
3334 | int digits, wordlen; | |
3335 | int sigfirst, signum, siglast; | |
3336 | enum target_signal oursig; | |
3337 | int allsigs; | |
3338 | int nsigs; | |
3339 | unsigned char *sigs; | |
3340 | struct cleanup *old_chain; | |
3341 | ||
3342 | if (args == NULL) | |
3343 | { | |
e2e0b3e5 | 3344 | error_no_arg (_("signal to handle")); |
c906108c SS |
3345 | } |
3346 | ||
3347 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3348 | ||
3349 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3350 | sigs = (unsigned char *) alloca (nsigs); | |
3351 | memset (sigs, 0, nsigs); | |
3352 | ||
3353 | /* Break the command line up into args. */ | |
3354 | ||
3355 | argv = buildargv (args); | |
3356 | if (argv == NULL) | |
3357 | { | |
3358 | nomem (0); | |
3359 | } | |
7a292a7a | 3360 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3361 | |
3362 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3363 | actions. Signal numbers and signal names may be interspersed with | |
3364 | actions, with the actions being performed for all signals cumulatively | |
3365 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3366 | ||
3367 | while (*argv != NULL) | |
3368 | { | |
3369 | wordlen = strlen (*argv); | |
3370 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3371 | {; | |
3372 | } | |
3373 | allsigs = 0; | |
3374 | sigfirst = siglast = -1; | |
3375 | ||
3376 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3377 | { | |
3378 | /* Apply action to all signals except those used by the | |
3379 | debugger. Silently skip those. */ | |
3380 | allsigs = 1; | |
3381 | sigfirst = 0; | |
3382 | siglast = nsigs - 1; | |
3383 | } | |
3384 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3385 | { | |
3386 | SET_SIGS (nsigs, sigs, signal_stop); | |
3387 | SET_SIGS (nsigs, sigs, signal_print); | |
3388 | } | |
3389 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3390 | { | |
3391 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3392 | } | |
3393 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3394 | { | |
3395 | SET_SIGS (nsigs, sigs, signal_print); | |
3396 | } | |
3397 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3398 | { | |
3399 | SET_SIGS (nsigs, sigs, signal_program); | |
3400 | } | |
3401 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3402 | { | |
3403 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3404 | } | |
3405 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3406 | { | |
3407 | SET_SIGS (nsigs, sigs, signal_program); | |
3408 | } | |
3409 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3410 | { | |
3411 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3412 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3413 | } | |
3414 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3415 | { | |
3416 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3417 | } | |
3418 | else if (digits > 0) | |
3419 | { | |
3420 | /* It is numeric. The numeric signal refers to our own | |
3421 | internal signal numbering from target.h, not to host/target | |
3422 | signal number. This is a feature; users really should be | |
3423 | using symbolic names anyway, and the common ones like | |
3424 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3425 | ||
3426 | sigfirst = siglast = (int) | |
3427 | target_signal_from_command (atoi (*argv)); | |
3428 | if ((*argv)[digits] == '-') | |
3429 | { | |
3430 | siglast = (int) | |
3431 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3432 | } | |
3433 | if (sigfirst > siglast) | |
3434 | { | |
3435 | /* Bet he didn't figure we'd think of this case... */ | |
3436 | signum = sigfirst; | |
3437 | sigfirst = siglast; | |
3438 | siglast = signum; | |
3439 | } | |
3440 | } | |
3441 | else | |
3442 | { | |
3443 | oursig = target_signal_from_name (*argv); | |
3444 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3445 | { | |
3446 | sigfirst = siglast = (int) oursig; | |
3447 | } | |
3448 | else | |
3449 | { | |
3450 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 3451 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
3452 | } |
3453 | } | |
3454 | ||
3455 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3456 | which signals to apply actions to. */ |
c906108c SS |
3457 | |
3458 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3459 | { | |
3460 | switch ((enum target_signal) signum) | |
3461 | { | |
3462 | case TARGET_SIGNAL_TRAP: | |
3463 | case TARGET_SIGNAL_INT: | |
3464 | if (!allsigs && !sigs[signum]) | |
3465 | { | |
3466 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3467 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3468 | { |
3469 | sigs[signum] = 1; | |
3470 | } | |
3471 | else | |
3472 | { | |
a3f17187 | 3473 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
3474 | gdb_flush (gdb_stdout); |
3475 | } | |
3476 | } | |
3477 | break; | |
3478 | case TARGET_SIGNAL_0: | |
3479 | case TARGET_SIGNAL_DEFAULT: | |
3480 | case TARGET_SIGNAL_UNKNOWN: | |
3481 | /* Make sure that "all" doesn't print these. */ | |
3482 | break; | |
3483 | default: | |
3484 | sigs[signum] = 1; | |
3485 | break; | |
3486 | } | |
3487 | } | |
3488 | ||
3489 | argv++; | |
3490 | } | |
3491 | ||
39f77062 | 3492 | target_notice_signals (inferior_ptid); |
c906108c SS |
3493 | |
3494 | if (from_tty) | |
3495 | { | |
3496 | /* Show the results. */ | |
3497 | sig_print_header (); | |
3498 | for (signum = 0; signum < nsigs; signum++) | |
3499 | { | |
3500 | if (sigs[signum]) | |
3501 | { | |
3502 | sig_print_info (signum); | |
3503 | } | |
3504 | } | |
3505 | } | |
3506 | ||
3507 | do_cleanups (old_chain); | |
3508 | } | |
3509 | ||
3510 | static void | |
96baa820 | 3511 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3512 | { |
3513 | char **argv; | |
3514 | struct cleanup *old_chain; | |
3515 | ||
3516 | /* Break the command line up into args. */ | |
3517 | ||
3518 | argv = buildargv (args); | |
3519 | if (argv == NULL) | |
3520 | { | |
3521 | nomem (0); | |
3522 | } | |
7a292a7a | 3523 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3524 | if (argv[1] != (char *) NULL) |
3525 | { | |
3526 | char *argBuf; | |
3527 | int bufLen; | |
3528 | ||
3529 | bufLen = strlen (argv[0]) + 20; | |
3530 | argBuf = (char *) xmalloc (bufLen); | |
3531 | if (argBuf) | |
3532 | { | |
3533 | int validFlag = 1; | |
3534 | enum target_signal oursig; | |
3535 | ||
3536 | oursig = target_signal_from_name (argv[0]); | |
3537 | memset (argBuf, 0, bufLen); | |
3538 | if (strcmp (argv[1], "Q") == 0) | |
3539 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3540 | else | |
3541 | { | |
3542 | if (strcmp (argv[1], "s") == 0) | |
3543 | { | |
3544 | if (!signal_stop[oursig]) | |
3545 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3546 | else | |
3547 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3548 | } | |
3549 | else if (strcmp (argv[1], "i") == 0) | |
3550 | { | |
3551 | if (!signal_program[oursig]) | |
3552 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3553 | else | |
3554 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3555 | } | |
3556 | else if (strcmp (argv[1], "r") == 0) | |
3557 | { | |
3558 | if (!signal_print[oursig]) | |
3559 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3560 | else | |
3561 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3562 | } | |
3563 | else | |
3564 | validFlag = 0; | |
3565 | } | |
3566 | if (validFlag) | |
3567 | handle_command (argBuf, from_tty); | |
3568 | else | |
a3f17187 | 3569 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 3570 | if (argBuf) |
b8c9b27d | 3571 | xfree (argBuf); |
c906108c SS |
3572 | } |
3573 | } | |
3574 | do_cleanups (old_chain); | |
3575 | } | |
3576 | ||
3577 | /* Print current contents of the tables set by the handle command. | |
3578 | It is possible we should just be printing signals actually used | |
3579 | by the current target (but for things to work right when switching | |
3580 | targets, all signals should be in the signal tables). */ | |
3581 | ||
3582 | static void | |
96baa820 | 3583 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3584 | { |
3585 | enum target_signal oursig; | |
3586 | sig_print_header (); | |
3587 | ||
3588 | if (signum_exp) | |
3589 | { | |
3590 | /* First see if this is a symbol name. */ | |
3591 | oursig = target_signal_from_name (signum_exp); | |
3592 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3593 | { | |
3594 | /* No, try numeric. */ | |
3595 | oursig = | |
bb518678 | 3596 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3597 | } |
3598 | sig_print_info (oursig); | |
3599 | return; | |
3600 | } | |
3601 | ||
3602 | printf_filtered ("\n"); | |
3603 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3604 | for (oursig = TARGET_SIGNAL_FIRST; | |
3605 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3606 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3607 | { | |
3608 | QUIT; | |
3609 | ||
3610 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3611 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3612 | sig_print_info (oursig); |
3613 | } | |
3614 | ||
a3f17187 | 3615 | printf_filtered (_("\nUse the \"handle\" command to change these tables.\n")); |
c906108c SS |
3616 | } |
3617 | \f | |
7a292a7a SS |
3618 | struct inferior_status |
3619 | { | |
3620 | enum target_signal stop_signal; | |
3621 | CORE_ADDR stop_pc; | |
3622 | bpstat stop_bpstat; | |
3623 | int stop_step; | |
3624 | int stop_stack_dummy; | |
3625 | int stopped_by_random_signal; | |
3626 | int trap_expected; | |
3627 | CORE_ADDR step_range_start; | |
3628 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3629 | struct frame_id step_frame_id; |
5fbbeb29 | 3630 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3631 | CORE_ADDR step_resume_break_address; |
3632 | int stop_after_trap; | |
c0236d92 | 3633 | int stop_soon; |
7a292a7a SS |
3634 | |
3635 | /* These are here because if call_function_by_hand has written some | |
3636 | registers and then decides to call error(), we better not have changed | |
3637 | any registers. */ | |
72cec141 | 3638 | struct regcache *registers; |
7a292a7a | 3639 | |
101dcfbe AC |
3640 | /* A frame unique identifier. */ |
3641 | struct frame_id selected_frame_id; | |
3642 | ||
7a292a7a SS |
3643 | int breakpoint_proceeded; |
3644 | int restore_stack_info; | |
3645 | int proceed_to_finish; | |
3646 | }; | |
3647 | ||
7a292a7a | 3648 | void |
96baa820 JM |
3649 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3650 | LONGEST val) | |
7a292a7a | 3651 | { |
3acba339 | 3652 | int size = register_size (current_gdbarch, regno); |
7a292a7a SS |
3653 | void *buf = alloca (size); |
3654 | store_signed_integer (buf, size, val); | |
0818c12a | 3655 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3656 | } |
3657 | ||
c906108c SS |
3658 | /* Save all of the information associated with the inferior<==>gdb |
3659 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3660 | (defined in inferior.h). */ | |
3661 | ||
7a292a7a | 3662 | struct inferior_status * |
96baa820 | 3663 | save_inferior_status (int restore_stack_info) |
c906108c | 3664 | { |
72cec141 | 3665 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3666 | |
c906108c SS |
3667 | inf_status->stop_signal = stop_signal; |
3668 | inf_status->stop_pc = stop_pc; | |
3669 | inf_status->stop_step = stop_step; | |
3670 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3671 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3672 | inf_status->trap_expected = trap_expected; | |
3673 | inf_status->step_range_start = step_range_start; | |
3674 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3675 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3676 | inf_status->step_over_calls = step_over_calls; |
3677 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3678 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3679 | /* Save original bpstat chain here; replace it with copy of chain. |
3680 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3681 | hand them back the original chain when restore_inferior_status is |
3682 | called. */ | |
c906108c SS |
3683 | inf_status->stop_bpstat = stop_bpstat; |
3684 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3685 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3686 | inf_status->restore_stack_info = restore_stack_info; | |
3687 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3688 | |
594f7785 | 3689 | inf_status->registers = regcache_dup (get_current_regcache ()); |
c906108c | 3690 | |
206415a3 | 3691 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
7a292a7a | 3692 | return inf_status; |
c906108c SS |
3693 | } |
3694 | ||
c906108c | 3695 | static int |
96baa820 | 3696 | restore_selected_frame (void *args) |
c906108c | 3697 | { |
488f131b | 3698 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3699 | struct frame_info *frame; |
c906108c | 3700 | |
101dcfbe | 3701 | frame = frame_find_by_id (*fid); |
c906108c | 3702 | |
aa0cd9c1 AC |
3703 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3704 | selected frame. */ | |
101dcfbe | 3705 | if (frame == NULL) |
c906108c | 3706 | { |
8a3fe4f8 | 3707 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
3708 | return 0; |
3709 | } | |
3710 | ||
0f7d239c | 3711 | select_frame (frame); |
c906108c SS |
3712 | |
3713 | return (1); | |
3714 | } | |
3715 | ||
3716 | void | |
96baa820 | 3717 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3718 | { |
3719 | stop_signal = inf_status->stop_signal; | |
3720 | stop_pc = inf_status->stop_pc; | |
3721 | stop_step = inf_status->stop_step; | |
3722 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3723 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3724 | trap_expected = inf_status->trap_expected; | |
3725 | step_range_start = inf_status->step_range_start; | |
3726 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3727 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3728 | step_over_calls = inf_status->step_over_calls; |
3729 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3730 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3731 | bpstat_clear (&stop_bpstat); |
3732 | stop_bpstat = inf_status->stop_bpstat; | |
3733 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3734 | proceed_to_finish = inf_status->proceed_to_finish; | |
3735 | ||
c906108c SS |
3736 | /* The inferior can be gone if the user types "print exit(0)" |
3737 | (and perhaps other times). */ | |
3738 | if (target_has_execution) | |
72cec141 | 3739 | /* NB: The register write goes through to the target. */ |
594f7785 | 3740 | regcache_cpy (get_current_regcache (), inf_status->registers); |
72cec141 | 3741 | regcache_xfree (inf_status->registers); |
c906108c | 3742 | |
c906108c SS |
3743 | /* FIXME: If we are being called after stopping in a function which |
3744 | is called from gdb, we should not be trying to restore the | |
3745 | selected frame; it just prints a spurious error message (The | |
3746 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3747 | clobbers the stack)). In fact, should we be restoring the | |
3748 | inferior status at all in that case? . */ | |
3749 | ||
3750 | if (target_has_stack && inf_status->restore_stack_info) | |
3751 | { | |
c906108c | 3752 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3753 | walking the stack might encounter a garbage pointer and |
3754 | error() trying to dereference it. */ | |
488f131b JB |
3755 | if (catch_errors |
3756 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3757 | "Unable to restore previously selected frame:\n", | |
3758 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3759 | /* Error in restoring the selected frame. Select the innermost |
3760 | frame. */ | |
0f7d239c | 3761 | select_frame (get_current_frame ()); |
c906108c SS |
3762 | |
3763 | } | |
c906108c | 3764 | |
72cec141 | 3765 | xfree (inf_status); |
7a292a7a | 3766 | } |
c906108c | 3767 | |
74b7792f AC |
3768 | static void |
3769 | do_restore_inferior_status_cleanup (void *sts) | |
3770 | { | |
3771 | restore_inferior_status (sts); | |
3772 | } | |
3773 | ||
3774 | struct cleanup * | |
3775 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3776 | { | |
3777 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3778 | } | |
3779 | ||
c906108c | 3780 | void |
96baa820 | 3781 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3782 | { |
3783 | /* See save_inferior_status for info on stop_bpstat. */ | |
3784 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 | 3785 | regcache_xfree (inf_status->registers); |
72cec141 | 3786 | xfree (inf_status); |
7a292a7a SS |
3787 | } |
3788 | ||
47932f85 DJ |
3789 | int |
3790 | inferior_has_forked (int pid, int *child_pid) | |
3791 | { | |
3792 | struct target_waitstatus last; | |
3793 | ptid_t last_ptid; | |
3794 | ||
3795 | get_last_target_status (&last_ptid, &last); | |
3796 | ||
3797 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3798 | return 0; | |
3799 | ||
3800 | if (ptid_get_pid (last_ptid) != pid) | |
3801 | return 0; | |
3802 | ||
3803 | *child_pid = last.value.related_pid; | |
3804 | return 1; | |
3805 | } | |
3806 | ||
3807 | int | |
3808 | inferior_has_vforked (int pid, int *child_pid) | |
3809 | { | |
3810 | struct target_waitstatus last; | |
3811 | ptid_t last_ptid; | |
3812 | ||
3813 | get_last_target_status (&last_ptid, &last); | |
3814 | ||
3815 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3816 | return 0; | |
3817 | ||
3818 | if (ptid_get_pid (last_ptid) != pid) | |
3819 | return 0; | |
3820 | ||
3821 | *child_pid = last.value.related_pid; | |
3822 | return 1; | |
3823 | } | |
3824 | ||
3825 | int | |
3826 | inferior_has_execd (int pid, char **execd_pathname) | |
3827 | { | |
3828 | struct target_waitstatus last; | |
3829 | ptid_t last_ptid; | |
3830 | ||
3831 | get_last_target_status (&last_ptid, &last); | |
3832 | ||
3833 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3834 | return 0; | |
3835 | ||
3836 | if (ptid_get_pid (last_ptid) != pid) | |
3837 | return 0; | |
3838 | ||
3839 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3840 | return 1; | |
3841 | } | |
3842 | ||
ca6724c1 KB |
3843 | /* Oft used ptids */ |
3844 | ptid_t null_ptid; | |
3845 | ptid_t minus_one_ptid; | |
3846 | ||
3847 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3848 | |
ca6724c1 KB |
3849 | ptid_t |
3850 | ptid_build (int pid, long lwp, long tid) | |
3851 | { | |
3852 | ptid_t ptid; | |
3853 | ||
3854 | ptid.pid = pid; | |
3855 | ptid.lwp = lwp; | |
3856 | ptid.tid = tid; | |
3857 | return ptid; | |
3858 | } | |
3859 | ||
3860 | /* Create a ptid from just a pid. */ | |
3861 | ||
3862 | ptid_t | |
3863 | pid_to_ptid (int pid) | |
3864 | { | |
3865 | return ptid_build (pid, 0, 0); | |
3866 | } | |
3867 | ||
3868 | /* Fetch the pid (process id) component from a ptid. */ | |
3869 | ||
3870 | int | |
3871 | ptid_get_pid (ptid_t ptid) | |
3872 | { | |
3873 | return ptid.pid; | |
3874 | } | |
3875 | ||
3876 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3877 | ||
3878 | long | |
3879 | ptid_get_lwp (ptid_t ptid) | |
3880 | { | |
3881 | return ptid.lwp; | |
3882 | } | |
3883 | ||
3884 | /* Fetch the tid (thread id) component from a ptid. */ | |
3885 | ||
3886 | long | |
3887 | ptid_get_tid (ptid_t ptid) | |
3888 | { | |
3889 | return ptid.tid; | |
3890 | } | |
3891 | ||
3892 | /* ptid_equal() is used to test equality of two ptids. */ | |
3893 | ||
3894 | int | |
3895 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3896 | { | |
3897 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3898 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3899 | } |
3900 | ||
3901 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3902 | to restore the inferior_ptid value saved in a call to | |
3903 | save_inferior_ptid(). */ | |
ce696e05 KB |
3904 | |
3905 | static void | |
3906 | restore_inferior_ptid (void *arg) | |
3907 | { | |
3908 | ptid_t *saved_ptid_ptr = arg; | |
3909 | inferior_ptid = *saved_ptid_ptr; | |
3910 | xfree (arg); | |
3911 | } | |
3912 | ||
3913 | /* Save the value of inferior_ptid so that it may be restored by a | |
3914 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3915 | needed for later doing the cleanup. */ | |
3916 | ||
3917 | struct cleanup * | |
3918 | save_inferior_ptid (void) | |
3919 | { | |
3920 | ptid_t *saved_ptid_ptr; | |
3921 | ||
3922 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3923 | *saved_ptid_ptr = inferior_ptid; | |
3924 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3925 | } | |
c5aa993b | 3926 | \f |
488f131b | 3927 | |
c906108c | 3928 | void |
96baa820 | 3929 | _initialize_infrun (void) |
c906108c | 3930 | { |
52f0bd74 AC |
3931 | int i; |
3932 | int numsigs; | |
c906108c SS |
3933 | struct cmd_list_element *c; |
3934 | ||
1bedd215 AC |
3935 | add_info ("signals", signals_info, _("\ |
3936 | What debugger does when program gets various signals.\n\ | |
3937 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
3938 | add_info_alias ("handle", "signals", 0); |
3939 | ||
1bedd215 AC |
3940 | add_com ("handle", class_run, handle_command, _("\ |
3941 | Specify how to handle a signal.\n\ | |
c906108c SS |
3942 | Args are signals and actions to apply to those signals.\n\ |
3943 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3944 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3945 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3946 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
3947 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
3948 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
c906108c SS |
3949 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3950 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3951 | Print means print a message if this signal happens.\n\ | |
3952 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3953 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 3954 | Pass and Stop may be combined.")); |
c906108c SS |
3955 | if (xdb_commands) |
3956 | { | |
1bedd215 AC |
3957 | add_com ("lz", class_info, signals_info, _("\ |
3958 | What debugger does when program gets various signals.\n\ | |
3959 | Specify a signal as argument to print info on that signal only.")); | |
3960 | add_com ("z", class_run, xdb_handle_command, _("\ | |
3961 | Specify how to handle a signal.\n\ | |
c906108c SS |
3962 | Args are signals and actions to apply to those signals.\n\ |
3963 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3964 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3965 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3966 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
3967 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
3968 | Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
c906108c SS |
3969 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3970 | nopass), \"Q\" (noprint)\n\ | |
3971 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3972 | Print means print a message if this signal happens.\n\ | |
3973 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3974 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 3975 | Pass and Stop may be combined.")); |
c906108c SS |
3976 | } |
3977 | ||
3978 | if (!dbx_commands) | |
1a966eab AC |
3979 | stop_command = add_cmd ("stop", class_obscure, |
3980 | not_just_help_class_command, _("\ | |
3981 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 3982 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 3983 | of the program stops."), &cmdlist); |
c906108c | 3984 | |
85c07804 AC |
3985 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
3986 | Set inferior debugging."), _("\ | |
3987 | Show inferior debugging."), _("\ | |
3988 | When non-zero, inferior specific debugging is enabled."), | |
3989 | NULL, | |
920d2a44 | 3990 | show_debug_infrun, |
85c07804 | 3991 | &setdebuglist, &showdebuglist); |
527159b7 | 3992 | |
c906108c | 3993 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 3994 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
3995 | signal_print = (unsigned char *) |
3996 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3997 | signal_program = (unsigned char *) | |
3998 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3999 | for (i = 0; i < numsigs; i++) | |
4000 | { | |
4001 | signal_stop[i] = 1; | |
4002 | signal_print[i] = 1; | |
4003 | signal_program[i] = 1; | |
4004 | } | |
4005 | ||
4006 | /* Signals caused by debugger's own actions | |
4007 | should not be given to the program afterwards. */ | |
4008 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4009 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4010 | ||
4011 | /* Signals that are not errors should not normally enter the debugger. */ | |
4012 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4013 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4014 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4015 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4016 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4017 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4018 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4019 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4020 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4021 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4022 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4023 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4024 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4025 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4026 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4027 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4028 | ||
cd0fc7c3 SS |
4029 | /* These signals are used internally by user-level thread |
4030 | implementations. (See signal(5) on Solaris.) Like the above | |
4031 | signals, a healthy program receives and handles them as part of | |
4032 | its normal operation. */ | |
4033 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4034 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4035 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4036 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4037 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4038 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4039 | ||
85c07804 AC |
4040 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
4041 | &stop_on_solib_events, _("\ | |
4042 | Set stopping for shared library events."), _("\ | |
4043 | Show stopping for shared library events."), _("\ | |
c906108c SS |
4044 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
4045 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
4046 | to the user would be loading/unloading of a new library."), |
4047 | NULL, | |
920d2a44 | 4048 | show_stop_on_solib_events, |
85c07804 | 4049 | &setlist, &showlist); |
c906108c | 4050 | |
7ab04401 AC |
4051 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
4052 | follow_fork_mode_kind_names, | |
4053 | &follow_fork_mode_string, _("\ | |
4054 | Set debugger response to a program call of fork or vfork."), _("\ | |
4055 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
4056 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
4057 | parent - the original process is debugged after a fork\n\ | |
4058 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 4059 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
4060 | By default, the debugger will follow the parent process."), |
4061 | NULL, | |
920d2a44 | 4062 | show_follow_fork_mode_string, |
7ab04401 AC |
4063 | &setlist, &showlist); |
4064 | ||
4065 | add_setshow_enum_cmd ("scheduler-locking", class_run, | |
4066 | scheduler_enums, &scheduler_mode, _("\ | |
4067 | Set mode for locking scheduler during execution."), _("\ | |
4068 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
4069 | off == no locking (threads may preempt at any time)\n\ |
4070 | on == full locking (no thread except the current thread may run)\n\ | |
4071 | step == scheduler locked during every single-step operation.\n\ | |
4072 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
4073 | Other threads may run while stepping over a function call ('next')."), |
4074 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 4075 | show_scheduler_mode, |
7ab04401 | 4076 | &setlist, &showlist); |
5fbbeb29 | 4077 | |
5bf193a2 AC |
4078 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
4079 | Set mode of the step operation."), _("\ | |
4080 | Show mode of the step operation."), _("\ | |
4081 | When set, doing a step over a function without debug line information\n\ | |
4082 | will stop at the first instruction of that function. Otherwise, the\n\ | |
4083 | function is skipped and the step command stops at a different source line."), | |
4084 | NULL, | |
920d2a44 | 4085 | show_step_stop_if_no_debug, |
5bf193a2 | 4086 | &setlist, &showlist); |
ca6724c1 KB |
4087 | |
4088 | /* ptid initializations */ | |
4089 | null_ptid = ptid_build (0, 0, 0); | |
4090 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4091 | inferior_ptid = null_ptid; | |
4092 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 4093 | } |