Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
6aba47ca | 4 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
9b254dd1 DJ |
5 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
6 | 2008 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 | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 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 | 20 | You should have received a copy of the GNU General Public License |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "gdb_string.h" | |
25 | #include <ctype.h> | |
26 | #include "symtab.h" | |
27 | #include "frame.h" | |
28 | #include "inferior.h" | |
60250e8b | 29 | #include "exceptions.h" |
c906108c | 30 | #include "breakpoint.h" |
03f2053f | 31 | #include "gdb_wait.h" |
c906108c SS |
32 | #include "gdbcore.h" |
33 | #include "gdbcmd.h" | |
210661e7 | 34 | #include "cli/cli-script.h" |
c906108c SS |
35 | #include "target.h" |
36 | #include "gdbthread.h" | |
37 | #include "annotate.h" | |
1adeb98a | 38 | #include "symfile.h" |
7a292a7a | 39 | #include "top.h" |
c906108c | 40 | #include <signal.h> |
2acceee2 | 41 | #include "inf-loop.h" |
4e052eda | 42 | #include "regcache.h" |
fd0407d6 | 43 | #include "value.h" |
06600e06 | 44 | #include "observer.h" |
f636b87d | 45 | #include "language.h" |
a77053c2 | 46 | #include "solib.h" |
f17517ea | 47 | #include "main.h" |
a77053c2 | 48 | |
9f976b41 | 49 | #include "gdb_assert.h" |
034dad6f | 50 | #include "mi/mi-common.h" |
c906108c SS |
51 | |
52 | /* Prototypes for local functions */ | |
53 | ||
96baa820 | 54 | static void signals_info (char *, int); |
c906108c | 55 | |
96baa820 | 56 | static void handle_command (char *, int); |
c906108c | 57 | |
96baa820 | 58 | static void sig_print_info (enum target_signal); |
c906108c | 59 | |
96baa820 | 60 | static void sig_print_header (void); |
c906108c | 61 | |
74b7792f | 62 | static void resume_cleanups (void *); |
c906108c | 63 | |
96baa820 | 64 | static int hook_stop_stub (void *); |
c906108c | 65 | |
96baa820 JM |
66 | static int restore_selected_frame (void *); |
67 | ||
68 | static void build_infrun (void); | |
69 | ||
4ef3f3be | 70 | static int follow_fork (void); |
96baa820 JM |
71 | |
72 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 73 | struct cmd_list_element *c); |
96baa820 | 74 | |
96baa820 JM |
75 | struct execution_control_state; |
76 | ||
77 | static int currently_stepping (struct execution_control_state *ecs); | |
78 | ||
79 | static void xdb_handle_command (char *args, int from_tty); | |
80 | ||
6a6b96b9 | 81 | static int prepare_to_proceed (int); |
ea67f13b | 82 | |
96baa820 | 83 | void _initialize_infrun (void); |
43ff13b4 | 84 | |
c906108c SS |
85 | int inferior_ignoring_leading_exec_events = 0; |
86 | ||
5fbbeb29 CF |
87 | /* When set, stop the 'step' command if we enter a function which has |
88 | no line number information. The normal behavior is that we step | |
89 | over such function. */ | |
90 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
91 | static void |
92 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
93 | struct cmd_list_element *c, const char *value) | |
94 | { | |
95 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
96 | } | |
5fbbeb29 | 97 | |
43ff13b4 | 98 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 99 | |
43ff13b4 JM |
100 | int sync_execution = 0; |
101 | ||
c906108c SS |
102 | /* wait_for_inferior and normal_stop use this to notify the user |
103 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
104 | running in. */ |
105 | ||
39f77062 | 106 | static ptid_t previous_inferior_ptid; |
7a292a7a SS |
107 | |
108 | /* This is true for configurations that may follow through execl() and | |
109 | similar functions. At present this is only true for HP-UX native. */ | |
110 | ||
111 | #ifndef MAY_FOLLOW_EXEC | |
112 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
113 | #endif |
114 | ||
7a292a7a SS |
115 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
116 | ||
527159b7 | 117 | static int debug_infrun = 0; |
920d2a44 AC |
118 | static void |
119 | show_debug_infrun (struct ui_file *file, int from_tty, | |
120 | struct cmd_list_element *c, const char *value) | |
121 | { | |
122 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
123 | } | |
527159b7 | 124 | |
d4f3574e SS |
125 | /* If the program uses ELF-style shared libraries, then calls to |
126 | functions in shared libraries go through stubs, which live in a | |
127 | table called the PLT (Procedure Linkage Table). The first time the | |
128 | function is called, the stub sends control to the dynamic linker, | |
129 | which looks up the function's real address, patches the stub so | |
130 | that future calls will go directly to the function, and then passes | |
131 | control to the function. | |
132 | ||
133 | If we are stepping at the source level, we don't want to see any of | |
134 | this --- we just want to skip over the stub and the dynamic linker. | |
135 | The simple approach is to single-step until control leaves the | |
136 | dynamic linker. | |
137 | ||
ca557f44 AC |
138 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
139 | dynamic linker calls functions in the shared C library, so you | |
140 | can't tell from the PC alone whether the dynamic linker is still | |
141 | running. In this case, we use a step-resume breakpoint to get us | |
142 | past the dynamic linker, as if we were using "next" to step over a | |
143 | function call. | |
d4f3574e SS |
144 | |
145 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
146 | linker code or not. Normally, this means we single-step. However, | |
147 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
148 | address where we can place a step-resume breakpoint to get past the | |
149 | linker's symbol resolution function. | |
150 | ||
151 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
152 | pretty portable way, by comparing the PC against the address ranges | |
153 | of the dynamic linker's sections. | |
154 | ||
155 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
156 | it depends on internal details of the dynamic linker. It's usually | |
157 | not too hard to figure out where to put a breakpoint, but it | |
158 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
159 | sanity checking. If it can't figure things out, returning zero and | |
160 | getting the (possibly confusing) stepping behavior is better than | |
161 | signalling an error, which will obscure the change in the | |
162 | inferior's state. */ | |
c906108c | 163 | |
c906108c SS |
164 | /* This function returns TRUE if pc is the address of an instruction |
165 | that lies within the dynamic linker (such as the event hook, or the | |
166 | dld itself). | |
167 | ||
168 | This function must be used only when a dynamic linker event has | |
169 | been caught, and the inferior is being stepped out of the hook, or | |
170 | undefined results are guaranteed. */ | |
171 | ||
172 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
173 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
174 | #endif | |
175 | ||
c2c6d25f | 176 | |
7a292a7a SS |
177 | /* Convert the #defines into values. This is temporary until wfi control |
178 | flow is completely sorted out. */ | |
179 | ||
692590c1 MS |
180 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
181 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
182 | #else | |
183 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
184 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
185 | #endif | |
186 | ||
c906108c SS |
187 | /* Tables of how to react to signals; the user sets them. */ |
188 | ||
189 | static unsigned char *signal_stop; | |
190 | static unsigned char *signal_print; | |
191 | static unsigned char *signal_program; | |
192 | ||
193 | #define SET_SIGS(nsigs,sigs,flags) \ | |
194 | do { \ | |
195 | int signum = (nsigs); \ | |
196 | while (signum-- > 0) \ | |
197 | if ((sigs)[signum]) \ | |
198 | (flags)[signum] = 1; \ | |
199 | } while (0) | |
200 | ||
201 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
202 | do { \ | |
203 | int signum = (nsigs); \ | |
204 | while (signum-- > 0) \ | |
205 | if ((sigs)[signum]) \ | |
206 | (flags)[signum] = 0; \ | |
207 | } while (0) | |
208 | ||
39f77062 KB |
209 | /* Value to pass to target_resume() to cause all threads to resume */ |
210 | ||
211 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
212 | |
213 | /* Command list pointer for the "stop" placeholder. */ | |
214 | ||
215 | static struct cmd_list_element *stop_command; | |
216 | ||
c906108c SS |
217 | /* Function inferior was in as of last step command. */ |
218 | ||
219 | static struct symbol *step_start_function; | |
220 | ||
ca67fcb8 | 221 | /* Nonzero if we are presently stepping over a breakpoint. |
c906108c | 222 | |
ca67fcb8 VP |
223 | If we hit a breakpoint or watchpoint, and then continue, |
224 | we need to single step the current thread with breakpoints | |
225 | disabled, to avoid hitting the same breakpoint or | |
226 | watchpoint again. And we should step just a single | |
227 | thread and keep other threads stopped, so that | |
228 | other threads don't miss breakpoints while they are removed. | |
229 | ||
230 | So, this variable simultaneously means that we need to single | |
231 | step the current thread, keep other threads stopped, and that | |
232 | breakpoints should be removed while we step. | |
233 | ||
234 | This variable is set either: | |
235 | - in proceed, when we resume inferior on user's explicit request | |
236 | - in keep_going, if handle_inferior_event decides we need to | |
237 | step over breakpoint. | |
238 | ||
239 | The variable is cleared in clear_proceed_status, called every | |
240 | time before we call proceed. The proceed calls wait_for_inferior, | |
241 | which calls handle_inferior_event in a loop, and until | |
242 | wait_for_inferior exits, this variable is changed only by keep_going. */ | |
243 | ||
244 | static int stepping_over_breakpoint; | |
c906108c | 245 | |
c906108c SS |
246 | /* Nonzero if we want to give control to the user when we're notified |
247 | of shared library events by the dynamic linker. */ | |
248 | static int stop_on_solib_events; | |
920d2a44 AC |
249 | static void |
250 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
251 | struct cmd_list_element *c, const char *value) | |
252 | { | |
253 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
254 | value); | |
255 | } | |
c906108c | 256 | |
c906108c SS |
257 | /* Nonzero means expecting a trace trap |
258 | and should stop the inferior and return silently when it happens. */ | |
259 | ||
260 | int stop_after_trap; | |
261 | ||
262 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
263 | It is used after attach, due to attaching to a process; | |
264 | when running in the shell before the child program has been exec'd; | |
265 | and when running some kinds of remote stuff (FIXME?). */ | |
266 | ||
c0236d92 | 267 | enum stop_kind stop_soon; |
c906108c SS |
268 | |
269 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
270 | situation when stop_registers should be saved. */ | |
271 | ||
272 | int proceed_to_finish; | |
273 | ||
274 | /* Save register contents here when about to pop a stack dummy frame, | |
275 | if-and-only-if proceed_to_finish is set. | |
276 | Thus this contains the return value from the called function (assuming | |
277 | values are returned in a register). */ | |
278 | ||
72cec141 | 279 | struct regcache *stop_registers; |
c906108c | 280 | |
c906108c SS |
281 | /* Nonzero after stop if current stack frame should be printed. */ |
282 | ||
283 | static int stop_print_frame; | |
284 | ||
285 | static struct breakpoint *step_resume_breakpoint = NULL; | |
c906108c | 286 | |
e02bc4cc | 287 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
288 | returned by target_wait()/deprecated_target_wait_hook(). This |
289 | information is returned by get_last_target_status(). */ | |
39f77062 | 290 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
291 | static struct target_waitstatus target_last_waitstatus; |
292 | ||
c906108c SS |
293 | /* This is used to remember when a fork, vfork or exec event |
294 | was caught by a catchpoint, and thus the event is to be | |
295 | followed at the next resume of the inferior, and not | |
296 | immediately. */ | |
297 | static struct | |
488f131b JB |
298 | { |
299 | enum target_waitkind kind; | |
300 | struct | |
c906108c | 301 | { |
488f131b | 302 | int parent_pid; |
488f131b | 303 | int child_pid; |
c906108c | 304 | } |
488f131b JB |
305 | fork_event; |
306 | char *execd_pathname; | |
307 | } | |
c906108c SS |
308 | pending_follow; |
309 | ||
53904c9e AC |
310 | static const char follow_fork_mode_child[] = "child"; |
311 | static const char follow_fork_mode_parent[] = "parent"; | |
312 | ||
488f131b | 313 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
314 | follow_fork_mode_child, |
315 | follow_fork_mode_parent, | |
316 | NULL | |
ef346e04 | 317 | }; |
c906108c | 318 | |
53904c9e | 319 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
320 | static void |
321 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
322 | struct cmd_list_element *c, const char *value) | |
323 | { | |
324 | fprintf_filtered (file, _("\ | |
325 | Debugger response to a program call of fork or vfork is \"%s\".\n"), | |
326 | value); | |
327 | } | |
c906108c SS |
328 | \f |
329 | ||
6604731b | 330 | static int |
4ef3f3be | 331 | follow_fork (void) |
c906108c | 332 | { |
ea1dd7bc | 333 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
c906108c | 334 | |
6604731b | 335 | return target_follow_fork (follow_child); |
c906108c SS |
336 | } |
337 | ||
6604731b DJ |
338 | void |
339 | follow_inferior_reset_breakpoints (void) | |
c906108c | 340 | { |
6604731b DJ |
341 | /* Was there a step_resume breakpoint? (There was if the user |
342 | did a "next" at the fork() call.) If so, explicitly reset its | |
343 | thread number. | |
344 | ||
345 | step_resumes are a form of bp that are made to be per-thread. | |
346 | Since we created the step_resume bp when the parent process | |
347 | was being debugged, and now are switching to the child process, | |
348 | from the breakpoint package's viewpoint, that's a switch of | |
349 | "threads". We must update the bp's notion of which thread | |
350 | it is for, or it'll be ignored when it triggers. */ | |
351 | ||
352 | if (step_resume_breakpoint) | |
353 | breakpoint_re_set_thread (step_resume_breakpoint); | |
354 | ||
355 | /* Reinsert all breakpoints in the child. The user may have set | |
356 | breakpoints after catching the fork, in which case those | |
357 | were never set in the child, but only in the parent. This makes | |
358 | sure the inserted breakpoints match the breakpoint list. */ | |
359 | ||
360 | breakpoint_re_set (); | |
361 | insert_breakpoints (); | |
c906108c | 362 | } |
c906108c | 363 | |
1adeb98a FN |
364 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
365 | ||
c906108c | 366 | static void |
96baa820 | 367 | follow_exec (int pid, char *execd_pathname) |
c906108c | 368 | { |
c906108c | 369 | int saved_pid = pid; |
7a292a7a SS |
370 | struct target_ops *tgt; |
371 | ||
372 | if (!may_follow_exec) | |
373 | return; | |
c906108c | 374 | |
c906108c SS |
375 | /* This is an exec event that we actually wish to pay attention to. |
376 | Refresh our symbol table to the newly exec'd program, remove any | |
377 | momentary bp's, etc. | |
378 | ||
379 | If there are breakpoints, they aren't really inserted now, | |
380 | since the exec() transformed our inferior into a fresh set | |
381 | of instructions. | |
382 | ||
383 | We want to preserve symbolic breakpoints on the list, since | |
384 | we have hopes that they can be reset after the new a.out's | |
385 | symbol table is read. | |
386 | ||
387 | However, any "raw" breakpoints must be removed from the list | |
388 | (e.g., the solib bp's), since their address is probably invalid | |
389 | now. | |
390 | ||
391 | And, we DON'T want to call delete_breakpoints() here, since | |
392 | that may write the bp's "shadow contents" (the instruction | |
393 | value that was overwritten witha TRAP instruction). Since | |
394 | we now have a new a.out, those shadow contents aren't valid. */ | |
395 | update_breakpoints_after_exec (); | |
396 | ||
397 | /* If there was one, it's gone now. We cannot truly step-to-next | |
398 | statement through an exec(). */ | |
399 | step_resume_breakpoint = NULL; | |
400 | step_range_start = 0; | |
401 | step_range_end = 0; | |
402 | ||
c906108c | 403 | /* What is this a.out's name? */ |
a3f17187 | 404 | printf_unfiltered (_("Executing new program: %s\n"), execd_pathname); |
c906108c SS |
405 | |
406 | /* We've followed the inferior through an exec. Therefore, the | |
407 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
408 | |
409 | /* First collect the run target in effect. */ | |
410 | tgt = find_run_target (); | |
411 | /* If we can't find one, things are in a very strange state... */ | |
412 | if (tgt == NULL) | |
8a3fe4f8 | 413 | error (_("Could find run target to save before following exec")); |
7a292a7a | 414 | |
c906108c SS |
415 | gdb_flush (gdb_stdout); |
416 | target_mourn_inferior (); | |
39f77062 | 417 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 418 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 419 | push_target (tgt); |
c906108c SS |
420 | |
421 | /* That a.out is now the one to use. */ | |
422 | exec_file_attach (execd_pathname, 0); | |
423 | ||
424 | /* And also is where symbols can be found. */ | |
1adeb98a | 425 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
426 | |
427 | /* Reset the shared library package. This ensures that we get | |
428 | a shlib event when the child reaches "_start", at which point | |
429 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 430 | #if defined(SOLIB_RESTART) |
c906108c | 431 | SOLIB_RESTART (); |
7a292a7a SS |
432 | #endif |
433 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 434 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
a77053c2 MK |
435 | #else |
436 | solib_create_inferior_hook (); | |
7a292a7a | 437 | #endif |
c906108c SS |
438 | |
439 | /* Reinsert all breakpoints. (Those which were symbolic have | |
440 | been reset to the proper address in the new a.out, thanks | |
441 | to symbol_file_command...) */ | |
442 | insert_breakpoints (); | |
443 | ||
444 | /* The next resume of this inferior should bring it to the shlib | |
445 | startup breakpoints. (If the user had also set bp's on | |
446 | "main" from the old (parent) process, then they'll auto- | |
447 | matically get reset there in the new process.) */ | |
c906108c SS |
448 | } |
449 | ||
450 | /* Non-zero if we just simulating a single-step. This is needed | |
451 | because we cannot remove the breakpoints in the inferior process | |
452 | until after the `wait' in `wait_for_inferior'. */ | |
453 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
454 | |
455 | /* The thread we inserted single-step breakpoints for. */ | |
456 | static ptid_t singlestep_ptid; | |
457 | ||
fd48f117 DJ |
458 | /* PC when we started this single-step. */ |
459 | static CORE_ADDR singlestep_pc; | |
460 | ||
9f976b41 DJ |
461 | /* If another thread hit the singlestep breakpoint, we save the original |
462 | thread here so that we can resume single-stepping it later. */ | |
463 | static ptid_t saved_singlestep_ptid; | |
464 | static int stepping_past_singlestep_breakpoint; | |
6a6b96b9 | 465 | |
ca67fcb8 VP |
466 | /* If not equal to null_ptid, this means that after stepping over breakpoint |
467 | is finished, we need to switch to deferred_step_ptid, and step it. | |
468 | ||
469 | The use case is when one thread has hit a breakpoint, and then the user | |
470 | has switched to another thread and issued 'step'. We need to step over | |
471 | breakpoint in the thread which hit the breakpoint, but then continue | |
472 | stepping the thread user has selected. */ | |
473 | static ptid_t deferred_step_ptid; | |
c906108c SS |
474 | \f |
475 | ||
476 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 477 | static void |
74b7792f | 478 | resume_cleanups (void *ignore) |
c906108c SS |
479 | { |
480 | normal_stop (); | |
481 | } | |
482 | ||
53904c9e AC |
483 | static const char schedlock_off[] = "off"; |
484 | static const char schedlock_on[] = "on"; | |
485 | static const char schedlock_step[] = "step"; | |
488f131b | 486 | static const char *scheduler_enums[] = { |
ef346e04 AC |
487 | schedlock_off, |
488 | schedlock_on, | |
489 | schedlock_step, | |
490 | NULL | |
491 | }; | |
920d2a44 AC |
492 | static const char *scheduler_mode = schedlock_off; |
493 | static void | |
494 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
495 | struct cmd_list_element *c, const char *value) | |
496 | { | |
497 | fprintf_filtered (file, _("\ | |
498 | Mode for locking scheduler during execution is \"%s\".\n"), | |
499 | value); | |
500 | } | |
c906108c SS |
501 | |
502 | static void | |
96baa820 | 503 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 504 | { |
eefe576e AC |
505 | if (!target_can_lock_scheduler) |
506 | { | |
507 | scheduler_mode = schedlock_off; | |
508 | error (_("Target '%s' cannot support this command."), target_shortname); | |
509 | } | |
c906108c SS |
510 | } |
511 | ||
512 | ||
513 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
514 | wants to interrupt some lengthy single-stepping operation | |
515 | (for child processes, the SIGINT goes to the inferior, and so | |
516 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
517 | other targets, that's not true). | |
518 | ||
519 | STEP nonzero if we should step (zero to continue instead). | |
520 | SIG is the signal to give the inferior (zero for none). */ | |
521 | void | |
96baa820 | 522 | resume (int step, enum target_signal sig) |
c906108c SS |
523 | { |
524 | int should_resume = 1; | |
74b7792f | 525 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
526 | QUIT; |
527 | ||
527159b7 | 528 | if (debug_infrun) |
8a9de0e4 AC |
529 | fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n", |
530 | step, sig); | |
527159b7 | 531 | |
ef5cf84e MS |
532 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
533 | ||
c906108c | 534 | |
692590c1 MS |
535 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
536 | over an instruction that causes a page fault without triggering | |
537 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
538 | stop, because the hardware watchpoint is not triggered, but it forgets | |
539 | the step request and continues the program normally. | |
540 | Work around the problem by removing hardware watchpoints if a step is | |
541 | requested, GDB will check for a hardware watchpoint trigger after the | |
542 | step anyway. */ | |
c36b740a | 543 | if (CANNOT_STEP_HW_WATCHPOINTS && step) |
692590c1 | 544 | remove_hw_watchpoints (); |
488f131b | 545 | |
692590c1 | 546 | |
c2c6d25f JM |
547 | /* Normally, by the time we reach `resume', the breakpoints are either |
548 | removed or inserted, as appropriate. The exception is if we're sitting | |
549 | at a permanent breakpoint; we need to step over it, but permanent | |
550 | breakpoints can't be removed. So we have to test for it here. */ | |
551 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
6d350bb5 UW |
552 | { |
553 | if (gdbarch_skip_permanent_breakpoint_p (current_gdbarch)) | |
594f7785 UW |
554 | gdbarch_skip_permanent_breakpoint (current_gdbarch, |
555 | get_current_regcache ()); | |
6d350bb5 UW |
556 | else |
557 | error (_("\ | |
558 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
559 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
560 | a command like `return' or `jump' to continue execution.")); | |
561 | } | |
c2c6d25f | 562 | |
1c0fdd0e | 563 | if (step && gdbarch_software_single_step_p (current_gdbarch)) |
c906108c SS |
564 | { |
565 | /* Do it the hard way, w/temp breakpoints */ | |
1c0fdd0e | 566 | if (gdbarch_software_single_step (current_gdbarch, get_current_frame ())) |
e6590a1b UW |
567 | { |
568 | /* ...and don't ask hardware to do it. */ | |
569 | step = 0; | |
570 | /* and do not pull these breakpoints until after a `wait' in | |
571 | `wait_for_inferior' */ | |
572 | singlestep_breakpoints_inserted_p = 1; | |
573 | singlestep_ptid = inferior_ptid; | |
574 | singlestep_pc = read_pc (); | |
575 | } | |
c906108c SS |
576 | } |
577 | ||
c906108c | 578 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 579 | now to be followed, then do so. */ |
c906108c SS |
580 | switch (pending_follow.kind) |
581 | { | |
6604731b DJ |
582 | case TARGET_WAITKIND_FORKED: |
583 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 584 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
585 | if (follow_fork ()) |
586 | should_resume = 0; | |
c906108c SS |
587 | break; |
588 | ||
6604731b | 589 | case TARGET_WAITKIND_EXECD: |
c906108c | 590 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 591 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
592 | break; |
593 | ||
594 | default: | |
595 | break; | |
596 | } | |
c906108c SS |
597 | |
598 | /* Install inferior's terminal modes. */ | |
599 | target_terminal_inferior (); | |
600 | ||
601 | if (should_resume) | |
602 | { | |
39f77062 | 603 | ptid_t resume_ptid; |
dfcd3bfb | 604 | |
488f131b | 605 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e | 606 | |
cd76b0b7 VP |
607 | /* If STEP is set, it's a request to use hardware stepping |
608 | facilities. But in that case, we should never | |
609 | use singlestep breakpoint. */ | |
610 | gdb_assert (!(singlestep_breakpoints_inserted_p && step)); | |
611 | ||
612 | if (singlestep_breakpoints_inserted_p | |
613 | && stepping_past_singlestep_breakpoint) | |
c906108c | 614 | { |
cd76b0b7 VP |
615 | /* The situation here is as follows. In thread T1 we wanted to |
616 | single-step. Lacking hardware single-stepping we've | |
617 | set breakpoint at the PC of the next instruction -- call it | |
618 | P. After resuming, we've hit that breakpoint in thread T2. | |
619 | Now we've removed original breakpoint, inserted breakpoint | |
620 | at P+1, and try to step to advance T2 past breakpoint. | |
621 | We need to step only T2, as if T1 is allowed to freely run, | |
622 | it can run past P, and if other threads are allowed to run, | |
623 | they can hit breakpoint at P+1, and nested hits of single-step | |
624 | breakpoints is not something we'd want -- that's complicated | |
625 | to support, and has no value. */ | |
626 | resume_ptid = inferior_ptid; | |
627 | } | |
c906108c | 628 | |
e842223a VP |
629 | if ((step || singlestep_breakpoints_inserted_p) |
630 | && breakpoint_here_p (read_pc ()) | |
cd76b0b7 VP |
631 | && !breakpoint_inserted_here_p (read_pc ())) |
632 | { | |
633 | /* We're stepping, have breakpoint at PC, and it's | |
634 | not inserted. Most likely, proceed has noticed that | |
635 | we have breakpoint and tries to single-step over it, | |
636 | so that it's not hit. In which case, we need to | |
637 | single-step only this thread, and keep others stopped, | |
638 | as they can miss this breakpoint if allowed to run. | |
639 | ||
640 | The current code either has all breakpoints inserted, | |
641 | or all removed, so if we let other threads run, | |
642 | we can actually miss any breakpoint, not the one at PC. */ | |
ef5cf84e | 643 | resume_ptid = inferior_ptid; |
c906108c | 644 | } |
ef5cf84e | 645 | |
8fb3e588 AC |
646 | if ((scheduler_mode == schedlock_on) |
647 | || (scheduler_mode == schedlock_step | |
648 | && (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 649 | { |
ef5cf84e | 650 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 651 | resume_ptid = inferior_ptid; |
c906108c | 652 | } |
ef5cf84e | 653 | |
e6cf7916 | 654 | if (gdbarch_cannot_step_breakpoint (current_gdbarch)) |
c4ed33b9 AC |
655 | { |
656 | /* Most targets can step a breakpoint instruction, thus | |
657 | executing it normally. But if this one cannot, just | |
658 | continue and we will hit it anyway. */ | |
c36b740a | 659 | if (step && breakpoint_inserted_here_p (read_pc ())) |
c4ed33b9 AC |
660 | step = 0; |
661 | } | |
39f77062 | 662 | target_resume (resume_ptid, step, sig); |
c906108c SS |
663 | } |
664 | ||
665 | discard_cleanups (old_cleanups); | |
666 | } | |
667 | \f | |
668 | ||
669 | /* Clear out all variables saying what to do when inferior is continued. | |
670 | First do this, then set the ones you want, then call `proceed'. */ | |
671 | ||
672 | void | |
96baa820 | 673 | clear_proceed_status (void) |
c906108c | 674 | { |
ca67fcb8 | 675 | stepping_over_breakpoint = 0; |
c906108c SS |
676 | step_range_start = 0; |
677 | step_range_end = 0; | |
aa0cd9c1 | 678 | step_frame_id = null_frame_id; |
5fbbeb29 | 679 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c | 680 | stop_after_trap = 0; |
c0236d92 | 681 | stop_soon = NO_STOP_QUIETLY; |
c906108c SS |
682 | proceed_to_finish = 0; |
683 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
684 | ||
d5c31457 UW |
685 | if (stop_registers) |
686 | { | |
687 | regcache_xfree (stop_registers); | |
688 | stop_registers = NULL; | |
689 | } | |
690 | ||
c906108c SS |
691 | /* Discard any remaining commands or status from previous stop. */ |
692 | bpstat_clear (&stop_bpstat); | |
693 | } | |
694 | ||
ea67f13b DJ |
695 | /* This should be suitable for any targets that support threads. */ |
696 | ||
697 | static int | |
6a6b96b9 | 698 | prepare_to_proceed (int step) |
ea67f13b DJ |
699 | { |
700 | ptid_t wait_ptid; | |
701 | struct target_waitstatus wait_status; | |
702 | ||
703 | /* Get the last target status returned by target_wait(). */ | |
704 | get_last_target_status (&wait_ptid, &wait_status); | |
705 | ||
6a6b96b9 | 706 | /* Make sure we were stopped at a breakpoint. */ |
ea67f13b | 707 | if (wait_status.kind != TARGET_WAITKIND_STOPPED |
6a6b96b9 | 708 | || wait_status.value.sig != TARGET_SIGNAL_TRAP) |
ea67f13b DJ |
709 | { |
710 | return 0; | |
711 | } | |
712 | ||
6a6b96b9 | 713 | /* Switched over from WAIT_PID. */ |
ea67f13b | 714 | if (!ptid_equal (wait_ptid, minus_one_ptid) |
6a6b96b9 UW |
715 | && !ptid_equal (inferior_ptid, wait_ptid) |
716 | && breakpoint_here_p (read_pc_pid (wait_ptid))) | |
ea67f13b | 717 | { |
6a6b96b9 UW |
718 | /* If stepping, remember current thread to switch back to. */ |
719 | if (step) | |
ea67f13b | 720 | { |
ca67fcb8 | 721 | deferred_step_ptid = inferior_ptid; |
ea67f13b DJ |
722 | } |
723 | ||
6a6b96b9 UW |
724 | /* Switch back to WAIT_PID thread. */ |
725 | switch_to_thread (wait_ptid); | |
726 | ||
8fb3e588 | 727 | /* We return 1 to indicate that there is a breakpoint here, |
6a6b96b9 UW |
728 | so we need to step over it before continuing to avoid |
729 | hitting it straight away. */ | |
730 | return 1; | |
ea67f13b DJ |
731 | } |
732 | ||
733 | return 0; | |
ea67f13b | 734 | } |
e4846b08 JJ |
735 | |
736 | /* Record the pc of the program the last time it stopped. This is | |
737 | just used internally by wait_for_inferior, but need to be preserved | |
738 | over calls to it and cleared when the inferior is started. */ | |
739 | static CORE_ADDR prev_pc; | |
740 | ||
c906108c SS |
741 | /* Basic routine for continuing the program in various fashions. |
742 | ||
743 | ADDR is the address to resume at, or -1 for resume where stopped. | |
744 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 745 | or -1 for act according to how it stopped. |
c906108c | 746 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
747 | -1 means return after that and print nothing. |
748 | You should probably set various step_... variables | |
749 | before calling here, if you are stepping. | |
c906108c SS |
750 | |
751 | You should call clear_proceed_status before calling proceed. */ | |
752 | ||
753 | void | |
96baa820 | 754 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
755 | { |
756 | int oneproc = 0; | |
757 | ||
758 | if (step > 0) | |
759 | step_start_function = find_pc_function (read_pc ()); | |
760 | if (step < 0) | |
761 | stop_after_trap = 1; | |
762 | ||
2acceee2 | 763 | if (addr == (CORE_ADDR) -1) |
c906108c | 764 | { |
c906108c | 765 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
3352ef37 AC |
766 | /* There is a breakpoint at the address we will resume at, |
767 | step one instruction before inserting breakpoints so that | |
768 | we do not stop right away (and report a second hit at this | |
769 | breakpoint). */ | |
c906108c | 770 | oneproc = 1; |
3352ef37 AC |
771 | else if (gdbarch_single_step_through_delay_p (current_gdbarch) |
772 | && gdbarch_single_step_through_delay (current_gdbarch, | |
773 | get_current_frame ())) | |
774 | /* We stepped onto an instruction that needs to be stepped | |
775 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
776 | oneproc = 1; |
777 | } | |
778 | else | |
779 | { | |
780 | write_pc (addr); | |
c906108c SS |
781 | } |
782 | ||
527159b7 | 783 | if (debug_infrun) |
8a9de0e4 AC |
784 | fprintf_unfiltered (gdb_stdlog, |
785 | "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", | |
786 | paddr_nz (addr), siggnal, step); | |
527159b7 | 787 | |
c906108c SS |
788 | /* In a multi-threaded task we may select another thread |
789 | and then continue or step. | |
790 | ||
791 | But if the old thread was stopped at a breakpoint, it | |
792 | will immediately cause another breakpoint stop without | |
793 | any execution (i.e. it will report a breakpoint hit | |
794 | incorrectly). So we must step over it first. | |
795 | ||
ea67f13b | 796 | prepare_to_proceed checks the current thread against the thread |
c906108c SS |
797 | that reported the most recent event. If a step-over is required |
798 | it returns TRUE and sets the current thread to the old thread. */ | |
6a6b96b9 | 799 | if (prepare_to_proceed (step)) |
ea67f13b | 800 | oneproc = 1; |
c906108c | 801 | |
c906108c SS |
802 | if (oneproc) |
803 | /* We will get a trace trap after one instruction. | |
804 | Continue it automatically and insert breakpoints then. */ | |
ca67fcb8 | 805 | stepping_over_breakpoint = 1; |
c906108c | 806 | else |
c36b740a | 807 | insert_breakpoints (); |
c906108c SS |
808 | |
809 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
810 | stop_signal = siggnal; | |
811 | /* If this signal should not be seen by program, | |
812 | give it zero. Used for debugging signals. */ | |
813 | else if (!signal_program[stop_signal]) | |
814 | stop_signal = TARGET_SIGNAL_0; | |
815 | ||
816 | annotate_starting (); | |
817 | ||
818 | /* Make sure that output from GDB appears before output from the | |
819 | inferior. */ | |
820 | gdb_flush (gdb_stdout); | |
821 | ||
e4846b08 JJ |
822 | /* Refresh prev_pc value just prior to resuming. This used to be |
823 | done in stop_stepping, however, setting prev_pc there did not handle | |
824 | scenarios such as inferior function calls or returning from | |
825 | a function via the return command. In those cases, the prev_pc | |
826 | value was not set properly for subsequent commands. The prev_pc value | |
827 | is used to initialize the starting line number in the ecs. With an | |
828 | invalid value, the gdb next command ends up stopping at the position | |
829 | represented by the next line table entry past our start position. | |
830 | On platforms that generate one line table entry per line, this | |
831 | is not a problem. However, on the ia64, the compiler generates | |
832 | extraneous line table entries that do not increase the line number. | |
833 | When we issue the gdb next command on the ia64 after an inferior call | |
834 | or a return command, we often end up a few instructions forward, still | |
835 | within the original line we started. | |
836 | ||
837 | An attempt was made to have init_execution_control_state () refresh | |
838 | the prev_pc value before calculating the line number. This approach | |
839 | did not work because on platforms that use ptrace, the pc register | |
840 | cannot be read unless the inferior is stopped. At that point, we | |
841 | are not guaranteed the inferior is stopped and so the read_pc () | |
842 | call can fail. Setting the prev_pc value here ensures the value is | |
8fb3e588 | 843 | updated correctly when the inferior is stopped. */ |
e4846b08 JJ |
844 | prev_pc = read_pc (); |
845 | ||
c906108c SS |
846 | /* Resume inferior. */ |
847 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
848 | ||
849 | /* Wait for it to stop (if not standalone) | |
850 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
851 | /* Do this only if we are not using the event loop, or if the target |
852 | does not support asynchronous execution. */ | |
362646f5 | 853 | if (!target_can_async_p ()) |
43ff13b4 JM |
854 | { |
855 | wait_for_inferior (); | |
856 | normal_stop (); | |
857 | } | |
c906108c | 858 | } |
c906108c SS |
859 | \f |
860 | ||
861 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 862 | |
c906108c | 863 | void |
8621d6a9 | 864 | start_remote (int from_tty) |
c906108c SS |
865 | { |
866 | init_thread_list (); | |
867 | init_wait_for_inferior (); | |
b0f4b84b | 868 | stop_soon = STOP_QUIETLY_REMOTE; |
ca67fcb8 | 869 | stepping_over_breakpoint = 0; |
43ff13b4 | 870 | |
6426a772 JM |
871 | /* Always go on waiting for the target, regardless of the mode. */ |
872 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 873 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
874 | nothing is returned (instead of just blocking). Because of this, |
875 | targets expecting an immediate response need to, internally, set | |
876 | things up so that the target_wait() is forced to eventually | |
877 | timeout. */ | |
878 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
879 | differentiate to its caller what the state of the target is after | |
880 | the initial open has been performed. Here we're assuming that | |
881 | the target has stopped. It should be possible to eventually have | |
882 | target_open() return to the caller an indication that the target | |
883 | is currently running and GDB state should be set to the same as | |
884 | for an async run. */ | |
885 | wait_for_inferior (); | |
8621d6a9 DJ |
886 | |
887 | /* Now that the inferior has stopped, do any bookkeeping like | |
888 | loading shared libraries. We want to do this before normal_stop, | |
889 | so that the displayed frame is up to date. */ | |
890 | post_create_inferior (¤t_target, from_tty); | |
891 | ||
6426a772 | 892 | normal_stop (); |
c906108c SS |
893 | } |
894 | ||
895 | /* Initialize static vars when a new inferior begins. */ | |
896 | ||
897 | void | |
96baa820 | 898 | init_wait_for_inferior (void) |
c906108c SS |
899 | { |
900 | /* These are meaningless until the first time through wait_for_inferior. */ | |
901 | prev_pc = 0; | |
c906108c | 902 | |
c906108c SS |
903 | breakpoint_init_inferior (inf_starting); |
904 | ||
905 | /* Don't confuse first call to proceed(). */ | |
906 | stop_signal = TARGET_SIGNAL_0; | |
907 | ||
908 | /* The first resume is not following a fork/vfork/exec. */ | |
909 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c | 910 | |
c906108c | 911 | clear_proceed_status (); |
9f976b41 DJ |
912 | |
913 | stepping_past_singlestep_breakpoint = 0; | |
ca67fcb8 | 914 | deferred_step_ptid = null_ptid; |
ca005067 DJ |
915 | |
916 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 917 | } |
c906108c | 918 | \f |
b83266a0 SS |
919 | /* This enum encodes possible reasons for doing a target_wait, so that |
920 | wfi can call target_wait in one place. (Ultimately the call will be | |
921 | moved out of the infinite loop entirely.) */ | |
922 | ||
c5aa993b JM |
923 | enum infwait_states |
924 | { | |
cd0fc7c3 SS |
925 | infwait_normal_state, |
926 | infwait_thread_hop_state, | |
d983da9c | 927 | infwait_step_watch_state, |
cd0fc7c3 | 928 | infwait_nonstep_watch_state |
b83266a0 SS |
929 | }; |
930 | ||
11cf8741 JM |
931 | /* Why did the inferior stop? Used to print the appropriate messages |
932 | to the interface from within handle_inferior_event(). */ | |
933 | enum inferior_stop_reason | |
934 | { | |
11cf8741 JM |
935 | /* Step, next, nexti, stepi finished. */ |
936 | END_STEPPING_RANGE, | |
11cf8741 JM |
937 | /* Inferior terminated by signal. */ |
938 | SIGNAL_EXITED, | |
939 | /* Inferior exited. */ | |
940 | EXITED, | |
941 | /* Inferior received signal, and user asked to be notified. */ | |
942 | SIGNAL_RECEIVED | |
943 | }; | |
944 | ||
cd0fc7c3 SS |
945 | /* This structure contains what used to be local variables in |
946 | wait_for_inferior. Probably many of them can return to being | |
947 | locals in handle_inferior_event. */ | |
948 | ||
c5aa993b | 949 | struct execution_control_state |
488f131b JB |
950 | { |
951 | struct target_waitstatus ws; | |
952 | struct target_waitstatus *wp; | |
ca67fcb8 VP |
953 | /* Should we step over breakpoint next time keep_going |
954 | is called? */ | |
955 | int stepping_over_breakpoint; | |
488f131b JB |
956 | int random_signal; |
957 | CORE_ADDR stop_func_start; | |
958 | CORE_ADDR stop_func_end; | |
959 | char *stop_func_name; | |
960 | struct symtab_and_line sal; | |
488f131b JB |
961 | int current_line; |
962 | struct symtab *current_symtab; | |
963 | int handling_longjmp; /* FIXME */ | |
964 | ptid_t ptid; | |
965 | ptid_t saved_inferior_ptid; | |
68f53502 | 966 | int step_after_step_resume_breakpoint; |
488f131b JB |
967 | int stepping_through_solib_after_catch; |
968 | bpstat stepping_through_solib_catchpoints; | |
488f131b JB |
969 | int new_thread_event; |
970 | struct target_waitstatus tmpstatus; | |
971 | enum infwait_states infwait_state; | |
972 | ptid_t waiton_ptid; | |
973 | int wait_some_more; | |
974 | }; | |
975 | ||
976 | void init_execution_control_state (struct execution_control_state *ecs); | |
977 | ||
978 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 979 | |
c2c6d25f | 980 | static void step_into_function (struct execution_control_state *ecs); |
44cbf7b5 | 981 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
14e60db5 | 982 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); |
44cbf7b5 AC |
983 | static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, |
984 | struct frame_id sr_id); | |
104c1213 JM |
985 | static void stop_stepping (struct execution_control_state *ecs); |
986 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 987 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
988 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
989 | int stop_info); | |
104c1213 | 990 | |
cd0fc7c3 SS |
991 | /* Wait for control to return from inferior to debugger. |
992 | If inferior gets a signal, we may decide to start it up again | |
993 | instead of returning. That is why there is a loop in this function. | |
994 | When this function actually returns it means the inferior | |
995 | should be left stopped and GDB should read more commands. */ | |
996 | ||
997 | void | |
96baa820 | 998 | wait_for_inferior (void) |
cd0fc7c3 SS |
999 | { |
1000 | struct cleanup *old_cleanups; | |
1001 | struct execution_control_state ecss; | |
1002 | struct execution_control_state *ecs; | |
c906108c | 1003 | |
527159b7 | 1004 | if (debug_infrun) |
8a9de0e4 | 1005 | fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n"); |
527159b7 | 1006 | |
8601f500 | 1007 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 1008 | &step_resume_breakpoint); |
cd0fc7c3 SS |
1009 | |
1010 | /* wfi still stays in a loop, so it's OK just to take the address of | |
1011 | a local to get the ecs pointer. */ | |
1012 | ecs = &ecss; | |
1013 | ||
1014 | /* Fill in with reasonable starting values. */ | |
1015 | init_execution_control_state (ecs); | |
1016 | ||
c906108c | 1017 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1018 | previous_inferior_ptid = inferior_ptid; |
c906108c | 1019 | |
cd0fc7c3 SS |
1020 | overlay_cache_invalid = 1; |
1021 | ||
1022 | /* We have to invalidate the registers BEFORE calling target_wait | |
1023 | because they can be loaded from the target while in target_wait. | |
1024 | This makes remote debugging a bit more efficient for those | |
1025 | targets that provide critical registers as part of their normal | |
1026 | status mechanism. */ | |
1027 | ||
1028 | registers_changed (); | |
b83266a0 | 1029 | |
c906108c SS |
1030 | while (1) |
1031 | { | |
9a4105ab AC |
1032 | if (deprecated_target_wait_hook) |
1033 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); | |
cd0fc7c3 | 1034 | else |
39f77062 | 1035 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 1036 | |
cd0fc7c3 SS |
1037 | /* Now figure out what to do with the result of the result. */ |
1038 | handle_inferior_event (ecs); | |
c906108c | 1039 | |
cd0fc7c3 SS |
1040 | if (!ecs->wait_some_more) |
1041 | break; | |
1042 | } | |
1043 | do_cleanups (old_cleanups); | |
1044 | } | |
c906108c | 1045 | |
43ff13b4 JM |
1046 | /* Asynchronous version of wait_for_inferior. It is called by the |
1047 | event loop whenever a change of state is detected on the file | |
1048 | descriptor corresponding to the target. It can be called more than | |
1049 | once to complete a single execution command. In such cases we need | |
1050 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1051 | last time that this function is called for a single execution | |
1052 | command, then report to the user that the inferior has stopped, and | |
1053 | do the necessary cleanups. */ | |
1054 | ||
1055 | struct execution_control_state async_ecss; | |
1056 | struct execution_control_state *async_ecs; | |
1057 | ||
1058 | void | |
fba45db2 | 1059 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1060 | { |
1061 | static struct cleanup *old_cleanups; | |
1062 | ||
c5aa993b | 1063 | async_ecs = &async_ecss; |
43ff13b4 JM |
1064 | |
1065 | if (!async_ecs->wait_some_more) | |
1066 | { | |
488f131b | 1067 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1068 | &step_resume_breakpoint); |
43ff13b4 JM |
1069 | |
1070 | /* Fill in with reasonable starting values. */ | |
1071 | init_execution_control_state (async_ecs); | |
1072 | ||
43ff13b4 | 1073 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1074 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1075 | |
1076 | overlay_cache_invalid = 1; | |
1077 | ||
1078 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1079 | because they can be loaded from the target while in target_wait. |
1080 | This makes remote debugging a bit more efficient for those | |
1081 | targets that provide critical registers as part of their normal | |
1082 | status mechanism. */ | |
43ff13b4 JM |
1083 | |
1084 | registers_changed (); | |
1085 | } | |
1086 | ||
9a4105ab | 1087 | if (deprecated_target_wait_hook) |
488f131b | 1088 | async_ecs->ptid = |
9a4105ab | 1089 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1090 | else |
39f77062 | 1091 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1092 | |
1093 | /* Now figure out what to do with the result of the result. */ | |
1094 | handle_inferior_event (async_ecs); | |
1095 | ||
1096 | if (!async_ecs->wait_some_more) | |
1097 | { | |
adf40b2e | 1098 | /* Do only the cleanups that have been added by this |
488f131b JB |
1099 | function. Let the continuations for the commands do the rest, |
1100 | if there are any. */ | |
43ff13b4 JM |
1101 | do_exec_cleanups (old_cleanups); |
1102 | normal_stop (); | |
c2d11a7d JM |
1103 | if (step_multi && stop_step) |
1104 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1105 | else | |
1106 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1107 | } |
1108 | } | |
1109 | ||
cd0fc7c3 SS |
1110 | /* Prepare an execution control state for looping through a |
1111 | wait_for_inferior-type loop. */ | |
1112 | ||
1113 | void | |
96baa820 | 1114 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1115 | { |
ca67fcb8 | 1116 | ecs->stepping_over_breakpoint = 0; |
cd0fc7c3 | 1117 | ecs->random_signal = 0; |
68f53502 | 1118 | ecs->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 | 1119 | ecs->handling_longjmp = 0; /* FIXME */ |
cd0fc7c3 SS |
1120 | ecs->stepping_through_solib_after_catch = 0; |
1121 | ecs->stepping_through_solib_catchpoints = NULL; | |
cd0fc7c3 SS |
1122 | ecs->sal = find_pc_line (prev_pc, 0); |
1123 | ecs->current_line = ecs->sal.line; | |
1124 | ecs->current_symtab = ecs->sal.symtab; | |
1125 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1126 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1127 | ecs->wp = &(ecs->ws); |
1128 | } | |
1129 | ||
e02bc4cc | 1130 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1131 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1132 | cached by handle_inferior_event(), which gets called immediately | |
1133 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1134 | |
1135 | void | |
488f131b | 1136 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1137 | { |
39f77062 | 1138 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1139 | *status = target_last_waitstatus; |
1140 | } | |
1141 | ||
ac264b3b MS |
1142 | void |
1143 | nullify_last_target_wait_ptid (void) | |
1144 | { | |
1145 | target_last_wait_ptid = minus_one_ptid; | |
1146 | } | |
1147 | ||
dd80620e MS |
1148 | /* Switch thread contexts, maintaining "infrun state". */ |
1149 | ||
1150 | static void | |
1151 | context_switch (struct execution_control_state *ecs) | |
1152 | { | |
1153 | /* Caution: it may happen that the new thread (or the old one!) | |
1154 | is not in the thread list. In this case we must not attempt | |
1155 | to "switch context", or we run the risk that our context may | |
1156 | be lost. This may happen as a result of the target module | |
1157 | mishandling thread creation. */ | |
1158 | ||
fd48f117 DJ |
1159 | if (debug_infrun) |
1160 | { | |
1161 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
1162 | target_pid_to_str (inferior_ptid)); | |
1163 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
1164 | target_pid_to_str (ecs->ptid)); | |
1165 | } | |
1166 | ||
dd80620e | 1167 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) |
488f131b | 1168 | { /* Perform infrun state context switch: */ |
dd80620e | 1169 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1170 | save_infrun_state (inferior_ptid, prev_pc, |
ca67fcb8 | 1171 | stepping_over_breakpoint, step_resume_breakpoint, |
15960608 | 1172 | step_range_start, |
aa0cd9c1 | 1173 | step_range_end, &step_frame_id, |
ca67fcb8 | 1174 | ecs->handling_longjmp, ecs->stepping_over_breakpoint, |
dd80620e MS |
1175 | ecs->stepping_through_solib_after_catch, |
1176 | ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1177 | ecs->current_line, ecs->current_symtab); |
dd80620e MS |
1178 | |
1179 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1180 | load_infrun_state (ecs->ptid, &prev_pc, |
ca67fcb8 | 1181 | &stepping_over_breakpoint, &step_resume_breakpoint, |
15960608 | 1182 | &step_range_start, |
aa0cd9c1 | 1183 | &step_range_end, &step_frame_id, |
ca67fcb8 | 1184 | &ecs->handling_longjmp, &ecs->stepping_over_breakpoint, |
dd80620e MS |
1185 | &ecs->stepping_through_solib_after_catch, |
1186 | &ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1187 | &ecs->current_line, &ecs->current_symtab); |
dd80620e | 1188 | } |
6a6b96b9 UW |
1189 | |
1190 | switch_to_thread (ecs->ptid); | |
dd80620e MS |
1191 | } |
1192 | ||
4fa8626c DJ |
1193 | static void |
1194 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1195 | { | |
8aad930b | 1196 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1197 | |
1198 | /* If this target does not decrement the PC after breakpoints, then | |
1199 | we have nothing to do. */ | |
b798847d | 1200 | if (gdbarch_decr_pc_after_break (current_gdbarch) == 0) |
4fa8626c DJ |
1201 | return; |
1202 | ||
1203 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1204 | we aren't, just return. | |
9709f61c DJ |
1205 | |
1206 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
1207 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
1208 | implemented by software breakpoints should be handled through the normal | |
1209 | breakpoint layer. | |
8fb3e588 | 1210 | |
4fa8626c DJ |
1211 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
1212 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1213 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
1214 | gdbarch_decr_pc_after_break. I don't know any specific target that |
1215 | generates these signals at breakpoints (the code has been in GDB since at | |
1216 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 1217 | |
e6cf7916 UW |
1218 | In earlier versions of GDB, a target with |
1219 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
1220 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
1221 | target with both of these set in GDB history, and it seems unlikely to be | |
1222 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c DJ |
1223 | |
1224 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1225 | return; | |
1226 | ||
1227 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1228 | return; | |
1229 | ||
8aad930b AC |
1230 | /* Find the location where (if we've hit a breakpoint) the |
1231 | breakpoint would be. */ | |
b798847d UW |
1232 | breakpoint_pc = read_pc_pid (ecs->ptid) - gdbarch_decr_pc_after_break |
1233 | (current_gdbarch); | |
8aad930b | 1234 | |
1c0fdd0e UW |
1235 | /* Check whether there actually is a software breakpoint inserted |
1236 | at that location. */ | |
1237 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
8aad930b | 1238 | { |
1c0fdd0e UW |
1239 | /* When using hardware single-step, a SIGTRAP is reported for both |
1240 | a completed single-step and a software breakpoint. Need to | |
1241 | differentiate between the two, as the latter needs adjusting | |
1242 | but the former does not. | |
1243 | ||
1244 | The SIGTRAP can be due to a completed hardware single-step only if | |
1245 | - we didn't insert software single-step breakpoints | |
1246 | - the thread to be examined is still the current thread | |
1247 | - this thread is currently being stepped | |
1248 | ||
1249 | If any of these events did not occur, we must have stopped due | |
1250 | to hitting a software breakpoint, and have to back up to the | |
1251 | breakpoint address. | |
1252 | ||
1253 | As a special case, we could have hardware single-stepped a | |
1254 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
1255 | we also need to back up to the breakpoint address. */ | |
1256 | ||
1257 | if (singlestep_breakpoints_inserted_p | |
1258 | || !ptid_equal (ecs->ptid, inferior_ptid) | |
1259 | || !currently_stepping (ecs) | |
1260 | || prev_pc == breakpoint_pc) | |
8aad930b AC |
1261 | write_pc_pid (breakpoint_pc, ecs->ptid); |
1262 | } | |
4fa8626c DJ |
1263 | } |
1264 | ||
cd0fc7c3 SS |
1265 | /* Given an execution control state that has been freshly filled in |
1266 | by an event from the inferior, figure out what it means and take | |
1267 | appropriate action. */ | |
c906108c | 1268 | |
cd0fc7c3 | 1269 | void |
96baa820 | 1270 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1271 | { |
c8edd8b4 | 1272 | int sw_single_step_trap_p = 0; |
d983da9c DJ |
1273 | int stopped_by_watchpoint; |
1274 | int stepped_after_stopped_by_watchpoint = 0; | |
cd0fc7c3 | 1275 | |
e02bc4cc | 1276 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1277 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1278 | target_last_waitstatus = *ecs->wp; |
1279 | ||
ca005067 DJ |
1280 | /* Always clear state belonging to the previous time we stopped. */ |
1281 | stop_stack_dummy = 0; | |
1282 | ||
4fa8626c DJ |
1283 | adjust_pc_after_break (ecs); |
1284 | ||
488f131b JB |
1285 | switch (ecs->infwait_state) |
1286 | { | |
1287 | case infwait_thread_hop_state: | |
527159b7 | 1288 | if (debug_infrun) |
8a9de0e4 | 1289 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
488f131b JB |
1290 | /* Cancel the waiton_ptid. */ |
1291 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 | 1292 | break; |
b83266a0 | 1293 | |
488f131b | 1294 | case infwait_normal_state: |
527159b7 | 1295 | if (debug_infrun) |
8a9de0e4 | 1296 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
d983da9c DJ |
1297 | break; |
1298 | ||
1299 | case infwait_step_watch_state: | |
1300 | if (debug_infrun) | |
1301 | fprintf_unfiltered (gdb_stdlog, | |
1302 | "infrun: infwait_step_watch_state\n"); | |
1303 | ||
1304 | stepped_after_stopped_by_watchpoint = 1; | |
488f131b | 1305 | break; |
b83266a0 | 1306 | |
488f131b | 1307 | case infwait_nonstep_watch_state: |
527159b7 | 1308 | if (debug_infrun) |
8a9de0e4 AC |
1309 | fprintf_unfiltered (gdb_stdlog, |
1310 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 1311 | insert_breakpoints (); |
c906108c | 1312 | |
488f131b JB |
1313 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1314 | handle things like signals arriving and other things happening | |
1315 | in combination correctly? */ | |
1316 | stepped_after_stopped_by_watchpoint = 1; | |
1317 | break; | |
65e82032 AC |
1318 | |
1319 | default: | |
e2e0b3e5 | 1320 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b JB |
1321 | } |
1322 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1323 | |
35f196d9 | 1324 | reinit_frame_cache (); |
c906108c | 1325 | |
488f131b | 1326 | /* If it's a new process, add it to the thread database */ |
c906108c | 1327 | |
488f131b | 1328 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
b9b5d7ea | 1329 | && !ptid_equal (ecs->ptid, minus_one_ptid) |
488f131b JB |
1330 | && !in_thread_list (ecs->ptid)); |
1331 | ||
1332 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1333 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1334 | { | |
1335 | add_thread (ecs->ptid); | |
c906108c | 1336 | |
488f131b | 1337 | ui_out_text (uiout, "[New "); |
c95310c6 | 1338 | ui_out_text (uiout, target_pid_to_str (ecs->ptid)); |
488f131b | 1339 | ui_out_text (uiout, "]\n"); |
488f131b | 1340 | } |
c906108c | 1341 | |
488f131b JB |
1342 | switch (ecs->ws.kind) |
1343 | { | |
1344 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 1345 | if (debug_infrun) |
8a9de0e4 | 1346 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
b0f4b84b DJ |
1347 | /* Ignore gracefully during startup of the inferior, as it might |
1348 | be the shell which has just loaded some objects, otherwise | |
1349 | add the symbols for the newly loaded objects. Also ignore at | |
1350 | the beginning of an attach or remote session; we will query | |
1351 | the full list of libraries once the connection is | |
1352 | established. */ | |
c0236d92 | 1353 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1354 | { |
1355 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1356 | breakpoint addresses via breakpoint_re_set. */ | |
c36b740a | 1357 | remove_breakpoints (); |
c906108c | 1358 | |
488f131b JB |
1359 | /* Check for any newly added shared libraries if we're |
1360 | supposed to be adding them automatically. Switch | |
1361 | terminal for any messages produced by | |
1362 | breakpoint_re_set. */ | |
1363 | target_terminal_ours_for_output (); | |
aff6338a | 1364 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
1365 | stack's section table is kept up-to-date. Architectures, |
1366 | (e.g., PPC64), use the section table to perform | |
1367 | operations such as address => section name and hence | |
1368 | require the table to contain all sections (including | |
1369 | those found in shared libraries). */ | |
aff6338a | 1370 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
1371 | exec_ops to SOLIB_ADD. This is because current GDB is |
1372 | only tooled to propagate section_table changes out from | |
1373 | the "current_target" (see target_resize_to_sections), and | |
1374 | not up from the exec stratum. This, of course, isn't | |
1375 | right. "infrun.c" should only interact with the | |
1376 | exec/process stratum, instead relying on the target stack | |
1377 | to propagate relevant changes (stop, section table | |
1378 | changed, ...) up to other layers. */ | |
b0f4b84b | 1379 | #ifdef SOLIB_ADD |
aff6338a | 1380 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
b0f4b84b DJ |
1381 | #else |
1382 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
1383 | #endif | |
488f131b JB |
1384 | target_terminal_inferior (); |
1385 | ||
b0f4b84b DJ |
1386 | /* If requested, stop when the dynamic linker notifies |
1387 | gdb of events. This allows the user to get control | |
1388 | and place breakpoints in initializer routines for | |
1389 | dynamically loaded objects (among other things). */ | |
1390 | if (stop_on_solib_events) | |
1391 | { | |
1392 | stop_stepping (ecs); | |
1393 | return; | |
1394 | } | |
1395 | ||
1396 | /* NOTE drow/2007-05-11: This might be a good place to check | |
1397 | for "catch load". */ | |
1398 | ||
488f131b | 1399 | /* Reinsert breakpoints and continue. */ |
c36b740a | 1400 | insert_breakpoints (); |
488f131b | 1401 | } |
b0f4b84b DJ |
1402 | |
1403 | /* If we are skipping through a shell, or through shared library | |
1404 | loading that we aren't interested in, resume the program. If | |
1405 | we're running the program normally, also resume. But stop if | |
1406 | we're attaching or setting up a remote connection. */ | |
1407 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
1408 | { | |
1409 | resume (0, TARGET_SIGNAL_0); | |
1410 | prepare_to_wait (ecs); | |
1411 | return; | |
1412 | } | |
1413 | ||
1414 | break; | |
c5aa993b | 1415 | |
488f131b | 1416 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 1417 | if (debug_infrun) |
8a9de0e4 | 1418 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
1419 | resume (0, TARGET_SIGNAL_0); |
1420 | prepare_to_wait (ecs); | |
1421 | return; | |
c5aa993b | 1422 | |
488f131b | 1423 | case TARGET_WAITKIND_EXITED: |
527159b7 | 1424 | if (debug_infrun) |
8a9de0e4 | 1425 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
488f131b JB |
1426 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1427 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1428 | ||
1429 | /* Record the exit code in the convenience variable $_exitcode, so | |
1430 | that the user can inspect this again later. */ | |
1431 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1432 | value_from_longest (builtin_type_int, | |
1433 | (LONGEST) ecs->ws.value.integer)); | |
1434 | gdb_flush (gdb_stdout); | |
1435 | target_mourn_inferior (); | |
1c0fdd0e | 1436 | singlestep_breakpoints_inserted_p = 0; |
488f131b JB |
1437 | stop_print_frame = 0; |
1438 | stop_stepping (ecs); | |
1439 | return; | |
c5aa993b | 1440 | |
488f131b | 1441 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 1442 | if (debug_infrun) |
8a9de0e4 | 1443 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
488f131b JB |
1444 | stop_print_frame = 0; |
1445 | stop_signal = ecs->ws.value.sig; | |
1446 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1447 | |
488f131b JB |
1448 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1449 | reach here unless the inferior is dead. However, for years | |
1450 | target_kill() was called here, which hints that fatal signals aren't | |
1451 | really fatal on some systems. If that's true, then some changes | |
1452 | may be needed. */ | |
1453 | target_mourn_inferior (); | |
c906108c | 1454 | |
488f131b | 1455 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1c0fdd0e | 1456 | singlestep_breakpoints_inserted_p = 0; |
488f131b JB |
1457 | stop_stepping (ecs); |
1458 | return; | |
c906108c | 1459 | |
488f131b JB |
1460 | /* The following are the only cases in which we keep going; |
1461 | the above cases end in a continue or goto. */ | |
1462 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1463 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 1464 | if (debug_infrun) |
8a9de0e4 | 1465 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
488f131b JB |
1466 | stop_signal = TARGET_SIGNAL_TRAP; |
1467 | pending_follow.kind = ecs->ws.kind; | |
1468 | ||
8e7d2c16 DJ |
1469 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1470 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1471 | |
5a2901d9 DJ |
1472 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
1473 | { | |
1474 | context_switch (ecs); | |
35f196d9 | 1475 | reinit_frame_cache (); |
5a2901d9 DJ |
1476 | } |
1477 | ||
488f131b | 1478 | stop_pc = read_pc (); |
675bf4cb | 1479 | |
d983da9c | 1480 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); |
675bf4cb | 1481 | |
488f131b | 1482 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1483 | |
1484 | /* If no catchpoint triggered for this, then keep going. */ | |
1485 | if (ecs->random_signal) | |
1486 | { | |
1487 | stop_signal = TARGET_SIGNAL_0; | |
1488 | keep_going (ecs); | |
1489 | return; | |
1490 | } | |
488f131b JB |
1491 | goto process_event_stop_test; |
1492 | ||
1493 | case TARGET_WAITKIND_EXECD: | |
527159b7 | 1494 | if (debug_infrun) |
fc5261f2 | 1495 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b JB |
1496 | stop_signal = TARGET_SIGNAL_TRAP; |
1497 | ||
7d2830a3 | 1498 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
8fb3e588 AC |
1499 | target_wait function. Until then following vfork on HP/UX 10.20 |
1500 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1501 | /* Is this a target which reports multiple exec events per actual |
1502 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1503 | ignore all but the last one. Just resume the exec'r, and wait | |
1504 | for the next exec event. */ | |
1505 | if (inferior_ignoring_leading_exec_events) | |
1506 | { | |
1507 | inferior_ignoring_leading_exec_events--; | |
488f131b JB |
1508 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); |
1509 | prepare_to_wait (ecs); | |
1510 | return; | |
1511 | } | |
1512 | inferior_ignoring_leading_exec_events = | |
1513 | target_reported_exec_events_per_exec_call () - 1; | |
1514 | ||
1515 | pending_follow.execd_pathname = | |
1516 | savestring (ecs->ws.value.execd_pathname, | |
1517 | strlen (ecs->ws.value.execd_pathname)); | |
1518 | ||
488f131b JB |
1519 | /* This causes the eventpoints and symbol table to be reset. Must |
1520 | do this now, before trying to determine whether to stop. */ | |
1521 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1522 | xfree (pending_follow.execd_pathname); | |
c906108c | 1523 | |
488f131b JB |
1524 | stop_pc = read_pc_pid (ecs->ptid); |
1525 | ecs->saved_inferior_ptid = inferior_ptid; | |
1526 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1527 | |
d983da9c | 1528 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); |
675bf4cb | 1529 | |
488f131b JB |
1530 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1531 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 | 1532 | |
5a2901d9 DJ |
1533 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
1534 | { | |
1535 | context_switch (ecs); | |
35f196d9 | 1536 | reinit_frame_cache (); |
5a2901d9 DJ |
1537 | } |
1538 | ||
04e68871 DJ |
1539 | /* If no catchpoint triggered for this, then keep going. */ |
1540 | if (ecs->random_signal) | |
1541 | { | |
1542 | stop_signal = TARGET_SIGNAL_0; | |
1543 | keep_going (ecs); | |
1544 | return; | |
1545 | } | |
488f131b JB |
1546 | goto process_event_stop_test; |
1547 | ||
b4dc5ffa MK |
1548 | /* Be careful not to try to gather much state about a thread |
1549 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 1550 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 1551 | if (debug_infrun) |
8a9de0e4 | 1552 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
488f131b JB |
1553 | resume (0, TARGET_SIGNAL_0); |
1554 | prepare_to_wait (ecs); | |
1555 | return; | |
c906108c | 1556 | |
488f131b JB |
1557 | /* Before examining the threads further, step this thread to |
1558 | get it entirely out of the syscall. (We get notice of the | |
1559 | event when the thread is just on the verge of exiting a | |
1560 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 1561 | into user code.) */ |
488f131b | 1562 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 1563 | if (debug_infrun) |
8a9de0e4 | 1564 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
488f131b | 1565 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
488f131b JB |
1566 | prepare_to_wait (ecs); |
1567 | return; | |
c906108c | 1568 | |
488f131b | 1569 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 1570 | if (debug_infrun) |
8a9de0e4 | 1571 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
488f131b JB |
1572 | stop_signal = ecs->ws.value.sig; |
1573 | break; | |
c906108c | 1574 | |
488f131b JB |
1575 | /* We had an event in the inferior, but we are not interested |
1576 | in handling it at this level. The lower layers have already | |
8e7d2c16 | 1577 | done what needs to be done, if anything. |
8fb3e588 AC |
1578 | |
1579 | One of the possible circumstances for this is when the | |
1580 | inferior produces output for the console. The inferior has | |
1581 | not stopped, and we are ignoring the event. Another possible | |
1582 | circumstance is any event which the lower level knows will be | |
1583 | reported multiple times without an intervening resume. */ | |
488f131b | 1584 | case TARGET_WAITKIND_IGNORE: |
527159b7 | 1585 | if (debug_infrun) |
8a9de0e4 | 1586 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); |
8e7d2c16 | 1587 | prepare_to_wait (ecs); |
488f131b JB |
1588 | return; |
1589 | } | |
c906108c | 1590 | |
488f131b JB |
1591 | /* We may want to consider not doing a resume here in order to give |
1592 | the user a chance to play with the new thread. It might be good | |
1593 | to make that a user-settable option. */ | |
c906108c | 1594 | |
488f131b JB |
1595 | /* At this point, all threads are stopped (happens automatically in |
1596 | either the OS or the native code). Therefore we need to continue | |
1597 | all threads in order to make progress. */ | |
1598 | if (ecs->new_thread_event) | |
1599 | { | |
1600 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1601 | prepare_to_wait (ecs); | |
1602 | return; | |
1603 | } | |
c906108c | 1604 | |
488f131b JB |
1605 | stop_pc = read_pc_pid (ecs->ptid); |
1606 | ||
527159b7 | 1607 | if (debug_infrun) |
8a9de0e4 | 1608 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc)); |
527159b7 | 1609 | |
9f976b41 DJ |
1610 | if (stepping_past_singlestep_breakpoint) |
1611 | { | |
1c0fdd0e | 1612 | gdb_assert (singlestep_breakpoints_inserted_p); |
9f976b41 DJ |
1613 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
1614 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1615 | ||
1616 | stepping_past_singlestep_breakpoint = 0; | |
1617 | ||
1618 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
1619 | breakpoint, or stopped for some other reason. It would be nice if |
1620 | we could tell, but we can't reliably. */ | |
9f976b41 | 1621 | if (stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 1622 | { |
527159b7 | 1623 | if (debug_infrun) |
8a9de0e4 | 1624 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
9f976b41 | 1625 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 1626 | remove_single_step_breakpoints (); |
9f976b41 DJ |
1627 | singlestep_breakpoints_inserted_p = 0; |
1628 | ||
1629 | ecs->random_signal = 0; | |
1630 | ||
1631 | ecs->ptid = saved_singlestep_ptid; | |
1632 | context_switch (ecs); | |
9a4105ab AC |
1633 | if (deprecated_context_hook) |
1634 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1635 | |
1636 | resume (1, TARGET_SIGNAL_0); | |
1637 | prepare_to_wait (ecs); | |
1638 | return; | |
1639 | } | |
1640 | } | |
1641 | ||
1642 | stepping_past_singlestep_breakpoint = 0; | |
1643 | ||
ca67fcb8 | 1644 | if (!ptid_equal (deferred_step_ptid, null_ptid)) |
6a6b96b9 | 1645 | { |
6a6b96b9 UW |
1646 | /* If we stopped for some other reason than single-stepping, ignore |
1647 | the fact that we were supposed to switch back. */ | |
1648 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1649 | { | |
1650 | if (debug_infrun) | |
1651 | fprintf_unfiltered (gdb_stdlog, | |
ca67fcb8 | 1652 | "infrun: handling deferred step\n"); |
6a6b96b9 UW |
1653 | |
1654 | /* Pull the single step breakpoints out of the target. */ | |
1655 | if (singlestep_breakpoints_inserted_p) | |
1656 | { | |
1657 | remove_single_step_breakpoints (); | |
1658 | singlestep_breakpoints_inserted_p = 0; | |
1659 | } | |
1660 | ||
1661 | /* Note: We do not call context_switch at this point, as the | |
1662 | context is already set up for stepping the original thread. */ | |
ca67fcb8 VP |
1663 | switch_to_thread (deferred_step_ptid); |
1664 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
1665 | /* Suppress spurious "Switching to ..." message. */ |
1666 | previous_inferior_ptid = inferior_ptid; | |
1667 | ||
1668 | resume (1, TARGET_SIGNAL_0); | |
1669 | prepare_to_wait (ecs); | |
1670 | return; | |
1671 | } | |
ca67fcb8 VP |
1672 | |
1673 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
1674 | } |
1675 | ||
488f131b JB |
1676 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1677 | another thread. If so, then step that thread past the breakpoint, | |
1678 | and continue it. */ | |
1679 | ||
1680 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1681 | { | |
9f976b41 DJ |
1682 | int thread_hop_needed = 0; |
1683 | ||
f8d40ec8 JB |
1684 | /* Check if a regular breakpoint has been hit before checking |
1685 | for a potential single step breakpoint. Otherwise, GDB will | |
1686 | not see this breakpoint hit when stepping onto breakpoints. */ | |
c36b740a | 1687 | if (regular_breakpoint_inserted_here_p (stop_pc)) |
488f131b | 1688 | { |
c5aa993b | 1689 | ecs->random_signal = 0; |
4fa8626c | 1690 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1691 | thread_hop_needed = 1; |
1692 | } | |
1c0fdd0e | 1693 | else if (singlestep_breakpoints_inserted_p) |
9f976b41 | 1694 | { |
fd48f117 DJ |
1695 | /* We have not context switched yet, so this should be true |
1696 | no matter which thread hit the singlestep breakpoint. */ | |
1697 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
1698 | if (debug_infrun) | |
1699 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
1700 | "trap for %s\n", | |
1701 | target_pid_to_str (ecs->ptid)); | |
1702 | ||
9f976b41 DJ |
1703 | ecs->random_signal = 0; |
1704 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1705 | change when we go from single-threaded to multi-threaded. If | |
1706 | the singlestep_ptid is still in the list, assume that it is | |
1707 | really different from ecs->ptid. */ | |
1708 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1709 | && in_thread_list (singlestep_ptid)) | |
1710 | { | |
fd48f117 DJ |
1711 | /* If the PC of the thread we were trying to single-step |
1712 | has changed, discard this event (which we were going | |
1713 | to ignore anyway), and pretend we saw that thread | |
1714 | trap. This prevents us continuously moving the | |
1715 | single-step breakpoint forward, one instruction at a | |
1716 | time. If the PC has changed, then the thread we were | |
1717 | trying to single-step has trapped or been signalled, | |
1718 | but the event has not been reported to GDB yet. | |
1719 | ||
1720 | There might be some cases where this loses signal | |
1721 | information, if a signal has arrived at exactly the | |
1722 | same time that the PC changed, but this is the best | |
1723 | we can do with the information available. Perhaps we | |
1724 | should arrange to report all events for all threads | |
1725 | when they stop, or to re-poll the remote looking for | |
1726 | this particular thread (i.e. temporarily enable | |
1727 | schedlock). */ | |
1728 | if (read_pc_pid (singlestep_ptid) != singlestep_pc) | |
1729 | { | |
1730 | if (debug_infrun) | |
1731 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
1732 | " but expected thread advanced also\n"); | |
1733 | ||
1734 | /* The current context still belongs to | |
1735 | singlestep_ptid. Don't swap here, since that's | |
1736 | the context we want to use. Just fudge our | |
1737 | state and continue. */ | |
1738 | ecs->ptid = singlestep_ptid; | |
1739 | stop_pc = read_pc_pid (ecs->ptid); | |
1740 | } | |
1741 | else | |
1742 | { | |
1743 | if (debug_infrun) | |
1744 | fprintf_unfiltered (gdb_stdlog, | |
1745 | "infrun: unexpected thread\n"); | |
1746 | ||
1747 | thread_hop_needed = 1; | |
1748 | stepping_past_singlestep_breakpoint = 1; | |
1749 | saved_singlestep_ptid = singlestep_ptid; | |
1750 | } | |
9f976b41 DJ |
1751 | } |
1752 | } | |
1753 | ||
1754 | if (thread_hop_needed) | |
8fb3e588 AC |
1755 | { |
1756 | int remove_status; | |
1757 | ||
527159b7 | 1758 | if (debug_infrun) |
8a9de0e4 | 1759 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 1760 | |
8fb3e588 AC |
1761 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1762 | Just continue. */ | |
1763 | ||
1c0fdd0e | 1764 | if (singlestep_breakpoints_inserted_p) |
488f131b | 1765 | { |
8fb3e588 | 1766 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 1767 | remove_single_step_breakpoints (); |
8fb3e588 AC |
1768 | singlestep_breakpoints_inserted_p = 0; |
1769 | } | |
1770 | ||
1771 | remove_status = remove_breakpoints (); | |
1772 | /* Did we fail to remove breakpoints? If so, try | |
1773 | to set the PC past the bp. (There's at least | |
1774 | one situation in which we can fail to remove | |
1775 | the bp's: On HP-UX's that use ttrace, we can't | |
1776 | change the address space of a vforking child | |
1777 | process until the child exits (well, okay, not | |
1778 | then either :-) or execs. */ | |
1779 | if (remove_status != 0) | |
1780 | { | |
1781 | /* FIXME! This is obviously non-portable! */ | |
1782 | write_pc_pid (stop_pc + 4, ecs->ptid); | |
1783 | /* We need to restart all the threads now, | |
1784 | * unles we're running in scheduler-locked mode. | |
1785 | * Use currently_stepping to determine whether to | |
1786 | * step or continue. | |
1787 | */ | |
1788 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1789 | if (scheduler_mode == schedlock_on) | |
1790 | target_resume (ecs->ptid, | |
1791 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
488f131b | 1792 | else |
8fb3e588 AC |
1793 | target_resume (RESUME_ALL, |
1794 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1795 | prepare_to_wait (ecs); | |
1796 | return; | |
1797 | } | |
1798 | else | |
1799 | { /* Single step */ | |
8fb3e588 AC |
1800 | if (!ptid_equal (inferior_ptid, ecs->ptid)) |
1801 | context_switch (ecs); | |
1802 | ecs->waiton_ptid = ecs->ptid; | |
1803 | ecs->wp = &(ecs->ws); | |
ca67fcb8 | 1804 | ecs->stepping_over_breakpoint = 1; |
8fb3e588 AC |
1805 | |
1806 | ecs->infwait_state = infwait_thread_hop_state; | |
1807 | keep_going (ecs); | |
1808 | registers_changed (); | |
1809 | return; | |
1810 | } | |
488f131b | 1811 | } |
1c0fdd0e | 1812 | else if (singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
1813 | { |
1814 | sw_single_step_trap_p = 1; | |
1815 | ecs->random_signal = 0; | |
1816 | } | |
488f131b JB |
1817 | } |
1818 | else | |
1819 | ecs->random_signal = 1; | |
c906108c | 1820 | |
488f131b | 1821 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1822 | so, then switch to that thread. */ |
1823 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1824 | { |
527159b7 | 1825 | if (debug_infrun) |
8a9de0e4 | 1826 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 1827 | |
488f131b | 1828 | context_switch (ecs); |
c5aa993b | 1829 | |
9a4105ab AC |
1830 | if (deprecated_context_hook) |
1831 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 1832 | } |
c906108c | 1833 | |
1c0fdd0e | 1834 | if (singlestep_breakpoints_inserted_p) |
488f131b JB |
1835 | { |
1836 | /* Pull the single step breakpoints out of the target. */ | |
e0cd558a | 1837 | remove_single_step_breakpoints (); |
488f131b JB |
1838 | singlestep_breakpoints_inserted_p = 0; |
1839 | } | |
c906108c | 1840 | |
d983da9c DJ |
1841 | if (stepped_after_stopped_by_watchpoint) |
1842 | stopped_by_watchpoint = 0; | |
1843 | else | |
1844 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
1845 | ||
1846 | /* If necessary, step over this watchpoint. We'll be back to display | |
1847 | it in a moment. */ | |
1848 | if (stopped_by_watchpoint | |
1849 | && (HAVE_STEPPABLE_WATCHPOINT | |
1850 | || gdbarch_have_nonsteppable_watchpoint (current_gdbarch))) | |
488f131b | 1851 | { |
527159b7 | 1852 | if (debug_infrun) |
8a9de0e4 | 1853 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
c906108c | 1854 | |
488f131b JB |
1855 | /* At this point, we are stopped at an instruction which has |
1856 | attempted to write to a piece of memory under control of | |
1857 | a watchpoint. The instruction hasn't actually executed | |
1858 | yet. If we were to evaluate the watchpoint expression | |
1859 | now, we would get the old value, and therefore no change | |
1860 | would seem to have occurred. | |
1861 | ||
1862 | In order to make watchpoints work `right', we really need | |
1863 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
1864 | watchpoint expression. We do this by single-stepping the |
1865 | target. | |
1866 | ||
1867 | It may not be necessary to disable the watchpoint to stop over | |
1868 | it. For example, the PA can (with some kernel cooperation) | |
1869 | single step over a watchpoint without disabling the watchpoint. | |
1870 | ||
1871 | It is far more common to need to disable a watchpoint to step | |
1872 | the inferior over it. If we have non-steppable watchpoints, | |
1873 | we must disable the current watchpoint; it's simplest to | |
1874 | disable all watchpoints and breakpoints. */ | |
1875 | ||
1876 | if (!HAVE_STEPPABLE_WATCHPOINT) | |
1877 | remove_breakpoints (); | |
488f131b JB |
1878 | registers_changed (); |
1879 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
488f131b | 1880 | ecs->waiton_ptid = ecs->ptid; |
d983da9c DJ |
1881 | if (HAVE_STEPPABLE_WATCHPOINT) |
1882 | ecs->infwait_state = infwait_step_watch_state; | |
1883 | else | |
1884 | ecs->infwait_state = infwait_nonstep_watch_state; | |
488f131b JB |
1885 | prepare_to_wait (ecs); |
1886 | return; | |
1887 | } | |
1888 | ||
488f131b JB |
1889 | ecs->stop_func_start = 0; |
1890 | ecs->stop_func_end = 0; | |
1891 | ecs->stop_func_name = 0; | |
1892 | /* Don't care about return value; stop_func_start and stop_func_name | |
1893 | will both be 0 if it doesn't work. */ | |
1894 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1895 | &ecs->stop_func_start, &ecs->stop_func_end); | |
cbf3b44a UW |
1896 | ecs->stop_func_start |
1897 | += gdbarch_deprecated_function_start_offset (current_gdbarch); | |
ca67fcb8 | 1898 | ecs->stepping_over_breakpoint = 0; |
488f131b JB |
1899 | bpstat_clear (&stop_bpstat); |
1900 | stop_step = 0; | |
488f131b JB |
1901 | stop_print_frame = 1; |
1902 | ecs->random_signal = 0; | |
1903 | stopped_by_random_signal = 0; | |
488f131b | 1904 | |
3352ef37 | 1905 | if (stop_signal == TARGET_SIGNAL_TRAP |
ca67fcb8 | 1906 | && stepping_over_breakpoint |
3352ef37 AC |
1907 | && gdbarch_single_step_through_delay_p (current_gdbarch) |
1908 | && currently_stepping (ecs)) | |
1909 | { | |
b50d7442 | 1910 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 AC |
1911 | also on an instruction that needs to be stepped multiple |
1912 | times before it's been fully executing. E.g., architectures | |
1913 | with a delay slot. It needs to be stepped twice, once for | |
1914 | the instruction and once for the delay slot. */ | |
1915 | int step_through_delay | |
1916 | = gdbarch_single_step_through_delay (current_gdbarch, | |
1917 | get_current_frame ()); | |
527159b7 | 1918 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 1919 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
3352ef37 AC |
1920 | if (step_range_end == 0 && step_through_delay) |
1921 | { | |
1922 | /* The user issued a continue when stopped at a breakpoint. | |
1923 | Set up for another trap and get out of here. */ | |
ca67fcb8 | 1924 | ecs->stepping_over_breakpoint = 1; |
3352ef37 AC |
1925 | keep_going (ecs); |
1926 | return; | |
1927 | } | |
1928 | else if (step_through_delay) | |
1929 | { | |
1930 | /* The user issued a step when stopped at a breakpoint. | |
1931 | Maybe we should stop, maybe we should not - the delay | |
1932 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
1933 | case, don't decide that here, just set |
1934 | ecs->stepping_over_breakpoint, making sure we | |
1935 | single-step again before breakpoints are re-inserted. */ | |
1936 | ecs->stepping_over_breakpoint = 1; | |
3352ef37 AC |
1937 | } |
1938 | } | |
1939 | ||
488f131b JB |
1940 | /* Look at the cause of the stop, and decide what to do. |
1941 | The alternatives are: | |
1942 | 1) break; to really stop and return to the debugger, | |
1943 | 2) drop through to start up again | |
ca67fcb8 | 1944 | (set ecs->stepping_over_breakpoint to 1 to single step once) |
488f131b JB |
1945 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 |
1946 | will be made according to the signal handling tables. */ | |
1947 | ||
1948 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1949 | that have to do with the program's own actions. Note that |
1950 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1951 | on the operating system version. Here we detect when a SIGILL or | |
1952 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1953 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1954 | when we're trying to execute a breakpoint instruction on a | |
1955 | non-executable stack. This happens for call dummy breakpoints | |
1956 | for architectures like SPARC that place call dummies on the | |
1957 | stack. */ | |
488f131b JB |
1958 | |
1959 | if (stop_signal == TARGET_SIGNAL_TRAP | |
c36b740a | 1960 | || (breakpoint_inserted_here_p (stop_pc) |
8fb3e588 AC |
1961 | && (stop_signal == TARGET_SIGNAL_ILL |
1962 | || stop_signal == TARGET_SIGNAL_SEGV | |
1963 | || stop_signal == TARGET_SIGNAL_EMT)) | |
b0f4b84b DJ |
1964 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP |
1965 | || stop_soon == STOP_QUIETLY_REMOTE) | |
488f131b JB |
1966 | { |
1967 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1968 | { | |
527159b7 | 1969 | if (debug_infrun) |
8a9de0e4 | 1970 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
1971 | stop_print_frame = 0; |
1972 | stop_stepping (ecs); | |
1973 | return; | |
1974 | } | |
c54cfec8 EZ |
1975 | |
1976 | /* This is originated from start_remote(), start_inferior() and | |
1977 | shared libraries hook functions. */ | |
b0f4b84b | 1978 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
488f131b | 1979 | { |
527159b7 | 1980 | if (debug_infrun) |
8a9de0e4 | 1981 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
1982 | stop_stepping (ecs); |
1983 | return; | |
1984 | } | |
1985 | ||
c54cfec8 EZ |
1986 | /* This originates from attach_command(). We need to overwrite |
1987 | the stop_signal here, because some kernels don't ignore a | |
1988 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1989 | See more comments in inferior.h. */ | |
c0236d92 | 1990 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1991 | { |
1992 | stop_stepping (ecs); | |
1993 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1994 | stop_signal = TARGET_SIGNAL_0; | |
1995 | return; | |
1996 | } | |
1997 | ||
fba57f8f VP |
1998 | /* See if there is a breakpoint at the current PC. */ |
1999 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); | |
2000 | ||
2001 | /* Following in case break condition called a | |
2002 | function. */ | |
2003 | stop_print_frame = 1; | |
488f131b | 2004 | |
73dd234f | 2005 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
2006 | at one stage in the past included checks for an inferior |
2007 | function call's call dummy's return breakpoint. The original | |
2008 | comment, that went with the test, read: | |
73dd234f | 2009 | |
8fb3e588 AC |
2010 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
2011 | another signal besides SIGTRAP, so check here as well as | |
2012 | above.'' | |
73dd234f AC |
2013 | |
2014 | If someone ever tries to get get call dummys on a | |
2015 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
2016 | with something like a SIGSEGV), then those tests might need |
2017 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 2018 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
2019 | suspect that it won't be the case. |
2020 | ||
8fb3e588 AC |
2021 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
2022 | be necessary for call dummies on a non-executable stack on | |
2023 | SPARC. */ | |
73dd234f | 2024 | |
488f131b JB |
2025 | if (stop_signal == TARGET_SIGNAL_TRAP) |
2026 | ecs->random_signal | |
2027 | = !(bpstat_explains_signal (stop_bpstat) | |
ca67fcb8 | 2028 | || stepping_over_breakpoint |
488f131b | 2029 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
2030 | else |
2031 | { | |
73dd234f | 2032 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
2033 | if (!ecs->random_signal) |
2034 | stop_signal = TARGET_SIGNAL_TRAP; | |
2035 | } | |
2036 | } | |
2037 | ||
2038 | /* When we reach this point, we've pretty much decided | |
2039 | that the reason for stopping must've been a random | |
2040 | (unexpected) signal. */ | |
2041 | ||
2042 | else | |
2043 | ecs->random_signal = 1; | |
488f131b | 2044 | |
04e68871 | 2045 | process_event_stop_test: |
488f131b JB |
2046 | /* For the program's own signals, act according to |
2047 | the signal handling tables. */ | |
2048 | ||
2049 | if (ecs->random_signal) | |
2050 | { | |
2051 | /* Signal not for debugging purposes. */ | |
2052 | int printed = 0; | |
2053 | ||
527159b7 | 2054 | if (debug_infrun) |
8a9de0e4 | 2055 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal); |
527159b7 | 2056 | |
488f131b JB |
2057 | stopped_by_random_signal = 1; |
2058 | ||
2059 | if (signal_print[stop_signal]) | |
2060 | { | |
2061 | printed = 1; | |
2062 | target_terminal_ours_for_output (); | |
2063 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
2064 | } | |
2065 | if (signal_stop[stop_signal]) | |
2066 | { | |
2067 | stop_stepping (ecs); | |
2068 | return; | |
2069 | } | |
2070 | /* If not going to stop, give terminal back | |
2071 | if we took it away. */ | |
2072 | else if (printed) | |
2073 | target_terminal_inferior (); | |
2074 | ||
2075 | /* Clear the signal if it should not be passed. */ | |
2076 | if (signal_program[stop_signal] == 0) | |
2077 | stop_signal = TARGET_SIGNAL_0; | |
2078 | ||
68f53502 | 2079 | if (prev_pc == read_pc () |
68f53502 | 2080 | && breakpoint_here_p (read_pc ()) |
c36b740a | 2081 | && !breakpoint_inserted_here_p (read_pc ()) |
68f53502 AC |
2082 | && step_resume_breakpoint == NULL) |
2083 | { | |
2084 | /* We were just starting a new sequence, attempting to | |
2085 | single-step off of a breakpoint and expecting a SIGTRAP. | |
2086 | Intead this signal arrives. This signal will take us out | |
2087 | of the stepping range so GDB needs to remember to, when | |
2088 | the signal handler returns, resume stepping off that | |
2089 | breakpoint. */ | |
2090 | /* To simplify things, "continue" is forced to use the same | |
2091 | code paths as single-step - set a breakpoint at the | |
2092 | signal return address and then, once hit, step off that | |
2093 | breakpoint. */ | |
d3169d93 | 2094 | |
44cbf7b5 | 2095 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
68f53502 | 2096 | ecs->step_after_step_resume_breakpoint = 1; |
9d799f85 AC |
2097 | keep_going (ecs); |
2098 | return; | |
68f53502 | 2099 | } |
9d799f85 AC |
2100 | |
2101 | if (step_range_end != 0 | |
2102 | && stop_signal != TARGET_SIGNAL_0 | |
2103 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
2104 | && frame_id_eq (get_frame_id (get_current_frame ()), | |
2105 | step_frame_id) | |
2106 | && step_resume_breakpoint == NULL) | |
d303a6c7 AC |
2107 | { |
2108 | /* The inferior is about to take a signal that will take it | |
2109 | out of the single step range. Set a breakpoint at the | |
2110 | current PC (which is presumably where the signal handler | |
2111 | will eventually return) and then allow the inferior to | |
2112 | run free. | |
2113 | ||
2114 | Note that this is only needed for a signal delivered | |
2115 | while in the single-step range. Nested signals aren't a | |
2116 | problem as they eventually all return. */ | |
44cbf7b5 | 2117 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
9d799f85 AC |
2118 | keep_going (ecs); |
2119 | return; | |
d303a6c7 | 2120 | } |
9d799f85 AC |
2121 | |
2122 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
2123 | when either there's a nested signal, or when there's a | |
2124 | pending signal enabled just as the signal handler returns | |
2125 | (leaving the inferior at the step-resume-breakpoint without | |
2126 | actually executing it). Either way continue until the | |
2127 | breakpoint is really hit. */ | |
488f131b JB |
2128 | keep_going (ecs); |
2129 | return; | |
2130 | } | |
2131 | ||
2132 | /* Handle cases caused by hitting a breakpoint. */ | |
2133 | { | |
2134 | CORE_ADDR jmp_buf_pc; | |
2135 | struct bpstat_what what; | |
2136 | ||
2137 | what = bpstat_what (stop_bpstat); | |
2138 | ||
2139 | if (what.call_dummy) | |
2140 | { | |
2141 | stop_stack_dummy = 1; | |
c5aa993b | 2142 | } |
c906108c | 2143 | |
488f131b | 2144 | switch (what.main_action) |
c5aa993b | 2145 | { |
488f131b JB |
2146 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2147 | /* If we hit the breakpoint at longjmp, disable it for the | |
2148 | duration of this command. Then, install a temporary | |
2149 | breakpoint at the target of the jmp_buf. */ | |
527159b7 | 2150 | if (debug_infrun) |
8802d8ed | 2151 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); |
488f131b | 2152 | disable_longjmp_breakpoint (); |
91104499 | 2153 | if (!gdbarch_get_longjmp_target_p (current_gdbarch) |
60ade65d UW |
2154 | || !gdbarch_get_longjmp_target (current_gdbarch, |
2155 | get_current_frame (), &jmp_buf_pc)) | |
c5aa993b | 2156 | { |
488f131b | 2157 | keep_going (ecs); |
104c1213 | 2158 | return; |
c5aa993b | 2159 | } |
488f131b JB |
2160 | |
2161 | /* Need to blow away step-resume breakpoint, as it | |
2162 | interferes with us */ | |
2163 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2164 | { |
488f131b | 2165 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2166 | } |
c906108c | 2167 | |
8fb3e588 | 2168 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2169 | ecs->handling_longjmp = 1; /* FIXME */ |
2170 | keep_going (ecs); | |
2171 | return; | |
c906108c | 2172 | |
488f131b JB |
2173 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2174 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
527159b7 | 2175 | if (debug_infrun) |
8802d8ed | 2176 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); |
488f131b JB |
2177 | disable_longjmp_breakpoint (); |
2178 | ecs->handling_longjmp = 0; /* FIXME */ | |
2179 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2180 | break; | |
2181 | /* else fallthrough */ | |
2182 | ||
2183 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 2184 | if (debug_infrun) |
8802d8ed | 2185 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
ca67fcb8 | 2186 | ecs->stepping_over_breakpoint = 1; |
488f131b JB |
2187 | /* Still need to check other stuff, at least the case |
2188 | where we are stepping and step out of the right range. */ | |
2189 | break; | |
c906108c | 2190 | |
488f131b | 2191 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 2192 | if (debug_infrun) |
8802d8ed | 2193 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
488f131b | 2194 | stop_print_frame = 1; |
c906108c | 2195 | |
d303a6c7 AC |
2196 | /* We are about to nuke the step_resume_breakpointt via the |
2197 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2198 | |
488f131b JB |
2199 | stop_stepping (ecs); |
2200 | return; | |
c5aa993b | 2201 | |
488f131b | 2202 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 2203 | if (debug_infrun) |
8802d8ed | 2204 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
488f131b | 2205 | stop_print_frame = 0; |
c5aa993b | 2206 | |
d303a6c7 AC |
2207 | /* We are about to nuke the step_resume_breakpoin via the |
2208 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2209 | |
488f131b | 2210 | stop_stepping (ecs); |
e441088d | 2211 | return; |
c5aa993b | 2212 | |
488f131b JB |
2213 | case BPSTAT_WHAT_STEP_RESUME: |
2214 | /* This proably demands a more elegant solution, but, yeah | |
2215 | right... | |
c5aa993b | 2216 | |
488f131b JB |
2217 | This function's use of the simple variable |
2218 | step_resume_breakpoint doesn't seem to accomodate | |
2219 | simultaneously active step-resume bp's, although the | |
2220 | breakpoint list certainly can. | |
c5aa993b | 2221 | |
488f131b JB |
2222 | If we reach here and step_resume_breakpoint is already |
2223 | NULL, then apparently we have multiple active | |
2224 | step-resume bp's. We'll just delete the breakpoint we | |
2225 | stopped at, and carry on. | |
2226 | ||
2227 | Correction: what the code currently does is delete a | |
2228 | step-resume bp, but it makes no effort to ensure that | |
2229 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2230 | |
527159b7 | 2231 | if (debug_infrun) |
8802d8ed | 2232 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); |
527159b7 | 2233 | |
488f131b JB |
2234 | if (step_resume_breakpoint == NULL) |
2235 | { | |
2236 | step_resume_breakpoint = | |
2237 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2238 | } | |
2239 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
68f53502 AC |
2240 | if (ecs->step_after_step_resume_breakpoint) |
2241 | { | |
2242 | /* Back when the step-resume breakpoint was inserted, we | |
2243 | were trying to single-step off a breakpoint. Go back | |
2244 | to doing that. */ | |
2245 | ecs->step_after_step_resume_breakpoint = 0; | |
ca67fcb8 | 2246 | ecs->stepping_over_breakpoint = 1; |
68f53502 AC |
2247 | keep_going (ecs); |
2248 | return; | |
2249 | } | |
488f131b JB |
2250 | break; |
2251 | ||
488f131b JB |
2252 | case BPSTAT_WHAT_CHECK_SHLIBS: |
2253 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
c906108c | 2254 | { |
527159b7 | 2255 | if (debug_infrun) |
8802d8ed | 2256 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n"); |
488f131b JB |
2257 | /* Remove breakpoints, we eventually want to step over the |
2258 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2259 | breakpoint addresses via breakpoint_re_set. */ | |
c36b740a | 2260 | remove_breakpoints (); |
488f131b JB |
2261 | |
2262 | /* Check for any newly added shared libraries if we're | |
2263 | supposed to be adding them automatically. Switch | |
2264 | terminal for any messages produced by | |
2265 | breakpoint_re_set. */ | |
2266 | target_terminal_ours_for_output (); | |
aff6338a | 2267 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
2268 | stack's section table is kept up-to-date. Architectures, |
2269 | (e.g., PPC64), use the section table to perform | |
2270 | operations such as address => section name and hence | |
2271 | require the table to contain all sections (including | |
2272 | those found in shared libraries). */ | |
aff6338a | 2273 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
2274 | exec_ops to SOLIB_ADD. This is because current GDB is |
2275 | only tooled to propagate section_table changes out from | |
2276 | the "current_target" (see target_resize_to_sections), and | |
2277 | not up from the exec stratum. This, of course, isn't | |
2278 | right. "infrun.c" should only interact with the | |
2279 | exec/process stratum, instead relying on the target stack | |
2280 | to propagate relevant changes (stop, section table | |
2281 | changed, ...) up to other layers. */ | |
a77053c2 | 2282 | #ifdef SOLIB_ADD |
aff6338a | 2283 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
a77053c2 MK |
2284 | #else |
2285 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
2286 | #endif | |
488f131b JB |
2287 | target_terminal_inferior (); |
2288 | ||
488f131b JB |
2289 | /* If requested, stop when the dynamic linker notifies |
2290 | gdb of events. This allows the user to get control | |
2291 | and place breakpoints in initializer routines for | |
2292 | dynamically loaded objects (among other things). */ | |
877522db | 2293 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2294 | { |
488f131b | 2295 | stop_stepping (ecs); |
d4f3574e SS |
2296 | return; |
2297 | } | |
c5aa993b | 2298 | |
488f131b JB |
2299 | /* If we stopped due to an explicit catchpoint, then the |
2300 | (see above) call to SOLIB_ADD pulled in any symbols | |
2301 | from a newly-loaded library, if appropriate. | |
2302 | ||
2303 | We do want the inferior to stop, but not where it is | |
2304 | now, which is in the dynamic linker callback. Rather, | |
2305 | we would like it stop in the user's program, just after | |
2306 | the call that caused this catchpoint to trigger. That | |
2307 | gives the user a more useful vantage from which to | |
2308 | examine their program's state. */ | |
8fb3e588 AC |
2309 | else if (what.main_action |
2310 | == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2311 | { |
488f131b JB |
2312 | /* ??rehrauer: If I could figure out how to get the |
2313 | right return PC from here, we could just set a temp | |
2314 | breakpoint and resume. I'm not sure we can without | |
2315 | cracking open the dld's shared libraries and sniffing | |
2316 | their unwind tables and text/data ranges, and that's | |
2317 | not a terribly portable notion. | |
2318 | ||
2319 | Until that time, we must step the inferior out of the | |
2320 | dld callback, and also out of the dld itself (and any | |
2321 | code or stubs in libdld.sl, such as "shl_load" and | |
2322 | friends) until we reach non-dld code. At that point, | |
2323 | we can stop stepping. */ | |
2324 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2325 | &ecs-> | |
2326 | stepping_through_solib_catchpoints); | |
2327 | ecs->stepping_through_solib_after_catch = 1; | |
2328 | ||
2329 | /* Be sure to lift all breakpoints, so the inferior does | |
2330 | actually step past this point... */ | |
ca67fcb8 | 2331 | ecs->stepping_over_breakpoint = 1; |
488f131b | 2332 | break; |
c906108c | 2333 | } |
c5aa993b | 2334 | else |
c5aa993b | 2335 | { |
488f131b | 2336 | /* We want to step over this breakpoint, then keep going. */ |
ca67fcb8 | 2337 | ecs->stepping_over_breakpoint = 1; |
488f131b | 2338 | break; |
c5aa993b | 2339 | } |
488f131b | 2340 | } |
488f131b | 2341 | break; |
c906108c | 2342 | |
488f131b JB |
2343 | case BPSTAT_WHAT_LAST: |
2344 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2345 | |
488f131b JB |
2346 | case BPSTAT_WHAT_KEEP_CHECKING: |
2347 | break; | |
2348 | } | |
2349 | } | |
c906108c | 2350 | |
488f131b JB |
2351 | /* We come here if we hit a breakpoint but should not |
2352 | stop for it. Possibly we also were stepping | |
2353 | and should stop for that. So fall through and | |
2354 | test for stepping. But, if not stepping, | |
2355 | do not stop. */ | |
c906108c | 2356 | |
9d1ff73f MS |
2357 | /* Are we stepping to get the inferior out of the dynamic linker's |
2358 | hook (and possibly the dld itself) after catching a shlib | |
2359 | event? */ | |
488f131b JB |
2360 | if (ecs->stepping_through_solib_after_catch) |
2361 | { | |
2362 | #if defined(SOLIB_ADD) | |
2363 | /* Have we reached our destination? If not, keep going. */ | |
2364 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2365 | { | |
527159b7 | 2366 | if (debug_infrun) |
8a9de0e4 | 2367 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
ca67fcb8 | 2368 | ecs->stepping_over_breakpoint = 1; |
488f131b | 2369 | keep_going (ecs); |
104c1213 | 2370 | return; |
488f131b JB |
2371 | } |
2372 | #endif | |
527159b7 | 2373 | if (debug_infrun) |
8a9de0e4 | 2374 | fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
488f131b JB |
2375 | /* Else, stop and report the catchpoint(s) whose triggering |
2376 | caused us to begin stepping. */ | |
2377 | ecs->stepping_through_solib_after_catch = 0; | |
2378 | bpstat_clear (&stop_bpstat); | |
2379 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2380 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2381 | stop_print_frame = 1; | |
2382 | stop_stepping (ecs); | |
2383 | return; | |
2384 | } | |
c906108c | 2385 | |
488f131b JB |
2386 | if (step_resume_breakpoint) |
2387 | { | |
527159b7 | 2388 | if (debug_infrun) |
d3169d93 DJ |
2389 | fprintf_unfiltered (gdb_stdlog, |
2390 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 2391 | |
488f131b JB |
2392 | /* Having a step-resume breakpoint overrides anything |
2393 | else having to do with stepping commands until | |
2394 | that breakpoint is reached. */ | |
488f131b JB |
2395 | keep_going (ecs); |
2396 | return; | |
2397 | } | |
c5aa993b | 2398 | |
488f131b JB |
2399 | if (step_range_end == 0) |
2400 | { | |
527159b7 | 2401 | if (debug_infrun) |
8a9de0e4 | 2402 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 2403 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
2404 | keep_going (ecs); |
2405 | return; | |
2406 | } | |
c5aa993b | 2407 | |
488f131b | 2408 | /* If stepping through a line, keep going if still within it. |
c906108c | 2409 | |
488f131b JB |
2410 | Note that step_range_end is the address of the first instruction |
2411 | beyond the step range, and NOT the address of the last instruction | |
2412 | within it! */ | |
2413 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2414 | { | |
527159b7 | 2415 | if (debug_infrun) |
8a9de0e4 | 2416 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n", |
527159b7 RC |
2417 | paddr_nz (step_range_start), |
2418 | paddr_nz (step_range_end)); | |
488f131b JB |
2419 | keep_going (ecs); |
2420 | return; | |
2421 | } | |
c5aa993b | 2422 | |
488f131b | 2423 | /* We stepped out of the stepping range. */ |
c906108c | 2424 | |
488f131b JB |
2425 | /* If we are stepping at the source level and entered the runtime |
2426 | loader dynamic symbol resolution code, we keep on single stepping | |
2427 | until we exit the run time loader code and reach the callee's | |
2428 | address. */ | |
2429 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
a77053c2 MK |
2430 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE |
2431 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc) | |
2432 | #else | |
2433 | && in_solib_dynsym_resolve_code (stop_pc) | |
2434 | #endif | |
2435 | ) | |
488f131b | 2436 | { |
4c8c40e6 MK |
2437 | CORE_ADDR pc_after_resolver = |
2438 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2439 | |
527159b7 | 2440 | if (debug_infrun) |
8a9de0e4 | 2441 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
527159b7 | 2442 | |
488f131b JB |
2443 | if (pc_after_resolver) |
2444 | { | |
2445 | /* Set up a step-resume breakpoint at the address | |
2446 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2447 | struct symtab_and_line sr_sal; | |
fe39c653 | 2448 | init_sal (&sr_sal); |
488f131b JB |
2449 | sr_sal.pc = pc_after_resolver; |
2450 | ||
44cbf7b5 | 2451 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c5aa993b | 2452 | } |
c906108c | 2453 | |
488f131b JB |
2454 | keep_going (ecs); |
2455 | return; | |
2456 | } | |
c906108c | 2457 | |
42edda50 AC |
2458 | if (step_range_end != 1 |
2459 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2460 | || step_over_calls == STEP_OVER_ALL) | |
2461 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 2462 | { |
527159b7 | 2463 | if (debug_infrun) |
8a9de0e4 | 2464 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
42edda50 | 2465 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
2466 | a signal trampoline (either by a signal being delivered or by |
2467 | the signal handler returning). Just single-step until the | |
2468 | inferior leaves the trampoline (either by calling the handler | |
2469 | or returning). */ | |
488f131b JB |
2470 | keep_going (ecs); |
2471 | return; | |
2472 | } | |
c906108c | 2473 | |
c17eaafe DJ |
2474 | /* Check for subroutine calls. The check for the current frame |
2475 | equalling the step ID is not necessary - the check of the | |
2476 | previous frame's ID is sufficient - but it is a common case and | |
2477 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
2478 | |
2479 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
2480 | being equal, so to get into this block, both the current and | |
2481 | previous frame must have valid frame IDs. */ | |
c17eaafe DJ |
2482 | if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id) |
2483 | && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) | |
488f131b | 2484 | { |
95918acb | 2485 | CORE_ADDR real_stop_pc; |
8fb3e588 | 2486 | |
527159b7 | 2487 | if (debug_infrun) |
8a9de0e4 | 2488 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 2489 | |
95918acb AC |
2490 | if ((step_over_calls == STEP_OVER_NONE) |
2491 | || ((step_range_end == 1) | |
2492 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2493 | { | |
2494 | /* I presume that step_over_calls is only 0 when we're | |
2495 | supposed to be stepping at the assembly language level | |
2496 | ("stepi"). Just stop. */ | |
2497 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
2498 | thought it was a subroutine call but it was not. Stop as | |
2499 | well. FENN */ | |
2500 | stop_step = 1; | |
2501 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2502 | stop_stepping (ecs); | |
2503 | return; | |
2504 | } | |
8fb3e588 | 2505 | |
8567c30f AC |
2506 | if (step_over_calls == STEP_OVER_ALL) |
2507 | { | |
2508 | /* We're doing a "next", set a breakpoint at callee's return | |
2509 | address (the address at which the caller will | |
2510 | resume). */ | |
14e60db5 | 2511 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
8567c30f AC |
2512 | keep_going (ecs); |
2513 | return; | |
2514 | } | |
a53c66de | 2515 | |
95918acb | 2516 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
2517 | calling routine and the real function), locate the real |
2518 | function. That's what tells us (a) whether we want to step | |
2519 | into it at all, and (b) what prologue we want to run to the | |
2520 | end of, if we do step into it. */ | |
52f729a7 | 2521 | real_stop_pc = skip_language_trampoline (get_current_frame (), stop_pc); |
95918acb | 2522 | if (real_stop_pc == 0) |
52f729a7 UW |
2523 | real_stop_pc = gdbarch_skip_trampoline_code |
2524 | (current_gdbarch, get_current_frame (), stop_pc); | |
95918acb AC |
2525 | if (real_stop_pc != 0) |
2526 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 2527 | |
a77053c2 MK |
2528 | if ( |
2529 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
2530 | IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start) | |
2531 | #else | |
2532 | in_solib_dynsym_resolve_code (ecs->stop_func_start) | |
2533 | #endif | |
2534 | ) | |
1b2bfbb9 RC |
2535 | { |
2536 | struct symtab_and_line sr_sal; | |
2537 | init_sal (&sr_sal); | |
2538 | sr_sal.pc = ecs->stop_func_start; | |
2539 | ||
44cbf7b5 | 2540 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
8fb3e588 AC |
2541 | keep_going (ecs); |
2542 | return; | |
1b2bfbb9 RC |
2543 | } |
2544 | ||
95918acb | 2545 | /* If we have line number information for the function we are |
8fb3e588 | 2546 | thinking of stepping into, step into it. |
95918acb | 2547 | |
8fb3e588 AC |
2548 | If there are several symtabs at that PC (e.g. with include |
2549 | files), just want to know whether *any* of them have line | |
2550 | numbers. find_pc_line handles this. */ | |
95918acb AC |
2551 | { |
2552 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 2553 | |
95918acb AC |
2554 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2555 | if (tmp_sal.line != 0) | |
2556 | { | |
2557 | step_into_function (ecs); | |
2558 | return; | |
2559 | } | |
2560 | } | |
2561 | ||
2562 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
2563 | set, we stop the step so that the user has a chance to switch |
2564 | in assembly mode. */ | |
95918acb AC |
2565 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
2566 | { | |
2567 | stop_step = 1; | |
2568 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2569 | stop_stepping (ecs); | |
2570 | return; | |
2571 | } | |
2572 | ||
2573 | /* Set a breakpoint at callee's return address (the address at | |
8fb3e588 | 2574 | which the caller will resume). */ |
14e60db5 | 2575 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
95918acb | 2576 | keep_going (ecs); |
488f131b | 2577 | return; |
488f131b | 2578 | } |
c906108c | 2579 | |
488f131b JB |
2580 | /* If we're in the return path from a shared library trampoline, |
2581 | we want to proceed through the trampoline when stepping. */ | |
e76f05fa UW |
2582 | if (gdbarch_in_solib_return_trampoline (current_gdbarch, |
2583 | stop_pc, ecs->stop_func_name)) | |
488f131b | 2584 | { |
488f131b | 2585 | /* Determine where this trampoline returns. */ |
52f729a7 UW |
2586 | CORE_ADDR real_stop_pc; |
2587 | real_stop_pc = gdbarch_skip_trampoline_code | |
2588 | (current_gdbarch, get_current_frame (), stop_pc); | |
c906108c | 2589 | |
527159b7 | 2590 | if (debug_infrun) |
8a9de0e4 | 2591 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
527159b7 | 2592 | |
488f131b | 2593 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2594 | if (real_stop_pc) |
488f131b JB |
2595 | { |
2596 | /* And put the step-breakpoint there and go until there. */ | |
2597 | struct symtab_and_line sr_sal; | |
2598 | ||
fe39c653 | 2599 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2600 | sr_sal.pc = real_stop_pc; |
488f131b | 2601 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
44cbf7b5 AC |
2602 | |
2603 | /* Do not specify what the fp should be when we stop since | |
2604 | on some machines the prologue is where the new fp value | |
2605 | is established. */ | |
2606 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
c906108c | 2607 | |
488f131b JB |
2608 | /* Restart without fiddling with the step ranges or |
2609 | other state. */ | |
2610 | keep_going (ecs); | |
2611 | return; | |
2612 | } | |
2613 | } | |
c906108c | 2614 | |
7ed0fe66 DJ |
2615 | ecs->sal = find_pc_line (stop_pc, 0); |
2616 | ||
1b2bfbb9 RC |
2617 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
2618 | the trampoline processing logic, however, there are some trampolines | |
2619 | that have no names, so we should do trampoline handling first. */ | |
2620 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
7ed0fe66 DJ |
2621 | && ecs->stop_func_name == NULL |
2622 | && ecs->sal.line == 0) | |
1b2bfbb9 | 2623 | { |
527159b7 | 2624 | if (debug_infrun) |
8a9de0e4 | 2625 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
527159b7 | 2626 | |
1b2bfbb9 | 2627 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
2628 | undebuggable function (where there is no debugging information |
2629 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
2630 | inferior stopped). Since we want to skip this kind of code, |
2631 | we keep going until the inferior returns from this | |
14e60db5 DJ |
2632 | function - unless the user has asked us not to (via |
2633 | set step-mode) or we no longer know how to get back | |
2634 | to the call site. */ | |
2635 | if (step_stop_if_no_debug | |
2636 | || !frame_id_p (frame_unwind_id (get_current_frame ()))) | |
1b2bfbb9 RC |
2637 | { |
2638 | /* If we have no line number and the step-stop-if-no-debug | |
2639 | is set, we stop the step so that the user has a chance to | |
2640 | switch in assembly mode. */ | |
2641 | stop_step = 1; | |
2642 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2643 | stop_stepping (ecs); | |
2644 | return; | |
2645 | } | |
2646 | else | |
2647 | { | |
2648 | /* Set a breakpoint at callee's return address (the address | |
2649 | at which the caller will resume). */ | |
14e60db5 | 2650 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
1b2bfbb9 RC |
2651 | keep_going (ecs); |
2652 | return; | |
2653 | } | |
2654 | } | |
2655 | ||
2656 | if (step_range_end == 1) | |
2657 | { | |
2658 | /* It is stepi or nexti. We always want to stop stepping after | |
2659 | one instruction. */ | |
527159b7 | 2660 | if (debug_infrun) |
8a9de0e4 | 2661 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
1b2bfbb9 RC |
2662 | stop_step = 1; |
2663 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2664 | stop_stepping (ecs); | |
2665 | return; | |
2666 | } | |
2667 | ||
488f131b JB |
2668 | if (ecs->sal.line == 0) |
2669 | { | |
2670 | /* We have no line number information. That means to stop | |
2671 | stepping (does this always happen right after one instruction, | |
2672 | when we do "s" in a function with no line numbers, | |
2673 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 2674 | if (debug_infrun) |
8a9de0e4 | 2675 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
488f131b JB |
2676 | stop_step = 1; |
2677 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2678 | stop_stepping (ecs); | |
2679 | return; | |
2680 | } | |
c906108c | 2681 | |
488f131b JB |
2682 | if ((stop_pc == ecs->sal.pc) |
2683 | && (ecs->current_line != ecs->sal.line | |
2684 | || ecs->current_symtab != ecs->sal.symtab)) | |
2685 | { | |
2686 | /* We are at the start of a different line. So stop. Note that | |
2687 | we don't stop if we step into the middle of a different line. | |
2688 | That is said to make things like for (;;) statements work | |
2689 | better. */ | |
527159b7 | 2690 | if (debug_infrun) |
8a9de0e4 | 2691 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
488f131b JB |
2692 | stop_step = 1; |
2693 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2694 | stop_stepping (ecs); | |
2695 | return; | |
2696 | } | |
c906108c | 2697 | |
488f131b | 2698 | /* We aren't done stepping. |
c906108c | 2699 | |
488f131b JB |
2700 | Optimize by setting the stepping range to the line. |
2701 | (We might not be in the original line, but if we entered a | |
2702 | new line in mid-statement, we continue stepping. This makes | |
2703 | things like for(;;) statements work better.) */ | |
c906108c | 2704 | |
488f131b JB |
2705 | step_range_start = ecs->sal.pc; |
2706 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2707 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2708 | ecs->current_line = ecs->sal.line; |
2709 | ecs->current_symtab = ecs->sal.symtab; | |
2710 | ||
aa0cd9c1 AC |
2711 | /* In the case where we just stepped out of a function into the |
2712 | middle of a line of the caller, continue stepping, but | |
2713 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2714 | #if 0 |
2715 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2716 | generous. It will trigger on things like a step into a frameless | |
2717 | stackless leaf function. I think the logic should instead look | |
2718 | at the unwound frame ID has that should give a more robust | |
2719 | indication of what happened. */ | |
8fb3e588 AC |
2720 | if (step - ID == current - ID) |
2721 | still stepping in same function; | |
2722 | else if (step - ID == unwind (current - ID)) | |
2723 | stepped into a function; | |
2724 | else | |
2725 | stepped out of a function; | |
2726 | /* Of course this assumes that the frame ID unwind code is robust | |
2727 | and we're willing to introduce frame unwind logic into this | |
2728 | function. Fortunately, those days are nearly upon us. */ | |
65815ea1 | 2729 | #endif |
488f131b | 2730 | { |
09a7aba8 UW |
2731 | struct frame_info *frame = get_current_frame (); |
2732 | struct frame_id current_frame = get_frame_id (frame); | |
2733 | if (!(frame_id_inner (get_frame_arch (frame), current_frame, | |
2734 | step_frame_id))) | |
aa0cd9c1 | 2735 | step_frame_id = current_frame; |
488f131b | 2736 | } |
c906108c | 2737 | |
527159b7 | 2738 | if (debug_infrun) |
8a9de0e4 | 2739 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 2740 | keep_going (ecs); |
104c1213 JM |
2741 | } |
2742 | ||
2743 | /* Are we in the middle of stepping? */ | |
2744 | ||
2745 | static int | |
2746 | currently_stepping (struct execution_control_state *ecs) | |
2747 | { | |
d303a6c7 | 2748 | return ((!ecs->handling_longjmp |
104c1213 | 2749 | && ((step_range_end && step_resume_breakpoint == NULL) |
ca67fcb8 | 2750 | || stepping_over_breakpoint)) |
104c1213 JM |
2751 | || ecs->stepping_through_solib_after_catch |
2752 | || bpstat_should_step ()); | |
2753 | } | |
c906108c | 2754 | |
c2c6d25f JM |
2755 | /* Subroutine call with source code we should not step over. Do step |
2756 | to the first line of code in it. */ | |
2757 | ||
2758 | static void | |
2759 | step_into_function (struct execution_control_state *ecs) | |
2760 | { | |
2761 | struct symtab *s; | |
2762 | struct symtab_and_line sr_sal; | |
2763 | ||
2764 | s = find_pc_symtab (stop_pc); | |
2765 | if (s && s->language != language_asm) | |
a433963d UW |
2766 | ecs->stop_func_start = gdbarch_skip_prologue |
2767 | (current_gdbarch, ecs->stop_func_start); | |
c2c6d25f JM |
2768 | |
2769 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2770 | /* Use the step_resume_break to step until the end of the prologue, | |
2771 | even if that involves jumps (as it seems to on the vax under | |
2772 | 4.2). */ | |
2773 | /* If the prologue ends in the middle of a source line, continue to | |
2774 | the end of that source line (if it is still within the function). | |
2775 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2776 | if (ecs->sal.end |
2777 | && ecs->sal.pc != ecs->stop_func_start | |
2778 | && ecs->sal.end < ecs->stop_func_end) | |
2779 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2780 | |
2dbd5e30 KB |
2781 | /* Architectures which require breakpoint adjustment might not be able |
2782 | to place a breakpoint at the computed address. If so, the test | |
2783 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2784 | ecs->stop_func_start to an address at which a breakpoint may be | |
2785 | legitimately placed. | |
8fb3e588 | 2786 | |
2dbd5e30 KB |
2787 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
2788 | made, GDB will enter an infinite loop when stepping through | |
2789 | optimized code consisting of VLIW instructions which contain | |
2790 | subinstructions corresponding to different source lines. On | |
2791 | FR-V, it's not permitted to place a breakpoint on any but the | |
2792 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2793 | set, GDB will adjust the breakpoint address to the beginning of | |
2794 | the VLIW instruction. Thus, we need to make the corresponding | |
2795 | adjustment here when computing the stop address. */ | |
8fb3e588 | 2796 | |
2dbd5e30 KB |
2797 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
2798 | { | |
2799 | ecs->stop_func_start | |
2800 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
8fb3e588 | 2801 | ecs->stop_func_start); |
2dbd5e30 KB |
2802 | } |
2803 | ||
c2c6d25f JM |
2804 | if (ecs->stop_func_start == stop_pc) |
2805 | { | |
2806 | /* We are already there: stop now. */ | |
2807 | stop_step = 1; | |
488f131b | 2808 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2809 | stop_stepping (ecs); |
2810 | return; | |
2811 | } | |
2812 | else | |
2813 | { | |
2814 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2815 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2816 | sr_sal.pc = ecs->stop_func_start; |
2817 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
44cbf7b5 | 2818 | |
c2c6d25f | 2819 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
2820 | some machines the prologue is where the new fp value is |
2821 | established. */ | |
44cbf7b5 | 2822 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c2c6d25f JM |
2823 | |
2824 | /* And make sure stepping stops right away then. */ | |
2825 | step_range_end = step_range_start; | |
2826 | } | |
2827 | keep_going (ecs); | |
2828 | } | |
d4f3574e | 2829 | |
d3169d93 | 2830 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
2831 | This is used to both functions and to skip over code. */ |
2832 | ||
2833 | static void | |
2834 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
2835 | struct frame_id sr_id) | |
2836 | { | |
2837 | /* There should never be more than one step-resume breakpoint per | |
2838 | thread, so we should never be setting a new | |
2839 | step_resume_breakpoint when one is already active. */ | |
2840 | gdb_assert (step_resume_breakpoint == NULL); | |
d3169d93 DJ |
2841 | |
2842 | if (debug_infrun) | |
2843 | fprintf_unfiltered (gdb_stdlog, | |
2844 | "infrun: inserting step-resume breakpoint at 0x%s\n", | |
2845 | paddr_nz (sr_sal.pc)); | |
2846 | ||
44cbf7b5 AC |
2847 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, |
2848 | bp_step_resume); | |
44cbf7b5 | 2849 | } |
7ce450bd | 2850 | |
d3169d93 | 2851 | /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used |
14e60db5 | 2852 | to skip a potential signal handler. |
7ce450bd | 2853 | |
14e60db5 DJ |
2854 | This is called with the interrupted function's frame. The signal |
2855 | handler, when it returns, will resume the interrupted function at | |
2856 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
2857 | |
2858 | static void | |
44cbf7b5 | 2859 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
2860 | { |
2861 | struct symtab_and_line sr_sal; | |
2862 | ||
f4c1edd8 | 2863 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
2864 | init_sal (&sr_sal); /* initialize to zeros */ |
2865 | ||
bf6ae464 UW |
2866 | sr_sal.pc = gdbarch_addr_bits_remove |
2867 | (current_gdbarch, get_frame_pc (return_frame)); | |
d303a6c7 AC |
2868 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2869 | ||
44cbf7b5 | 2870 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
d303a6c7 AC |
2871 | } |
2872 | ||
14e60db5 DJ |
2873 | /* Similar to insert_step_resume_breakpoint_at_frame, except |
2874 | but a breakpoint at the previous frame's PC. This is used to | |
2875 | skip a function after stepping into it (for "next" or if the called | |
2876 | function has no debugging information). | |
2877 | ||
2878 | The current function has almost always been reached by single | |
2879 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
2880 | current function, and the breakpoint will be set at the caller's | |
2881 | resume address. | |
2882 | ||
2883 | This is a separate function rather than reusing | |
2884 | insert_step_resume_breakpoint_at_frame in order to avoid | |
2885 | get_prev_frame, which may stop prematurely (see the implementation | |
2886 | of frame_unwind_id for an example). */ | |
2887 | ||
2888 | static void | |
2889 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
2890 | { | |
2891 | struct symtab_and_line sr_sal; | |
2892 | ||
2893 | /* We shouldn't have gotten here if we don't know where the call site | |
2894 | is. */ | |
2895 | gdb_assert (frame_id_p (frame_unwind_id (next_frame))); | |
2896 | ||
2897 | init_sal (&sr_sal); /* initialize to zeros */ | |
2898 | ||
bf6ae464 UW |
2899 | sr_sal.pc = gdbarch_addr_bits_remove |
2900 | (current_gdbarch, frame_pc_unwind (next_frame)); | |
14e60db5 DJ |
2901 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2902 | ||
2903 | insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame)); | |
2904 | } | |
2905 | ||
104c1213 JM |
2906 | static void |
2907 | stop_stepping (struct execution_control_state *ecs) | |
2908 | { | |
527159b7 | 2909 | if (debug_infrun) |
8a9de0e4 | 2910 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 2911 | |
cd0fc7c3 SS |
2912 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2913 | ecs->wait_some_more = 0; | |
2914 | } | |
2915 | ||
d4f3574e SS |
2916 | /* This function handles various cases where we need to continue |
2917 | waiting for the inferior. */ | |
2918 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2919 | ||
2920 | static void | |
2921 | keep_going (struct execution_control_state *ecs) | |
2922 | { | |
d4f3574e | 2923 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2924 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 2925 | |
d4f3574e SS |
2926 | /* If we did not do break;, it means we should keep running the |
2927 | inferior and not return to debugger. */ | |
2928 | ||
ca67fcb8 | 2929 | if (stepping_over_breakpoint && stop_signal != TARGET_SIGNAL_TRAP) |
d4f3574e SS |
2930 | { |
2931 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2932 | the inferior, else we'd have done a break above) and we |
2933 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2934 | resume (currently_stepping (ecs), stop_signal); |
2935 | } | |
2936 | else | |
2937 | { | |
2938 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2939 | anyway (the user asked that this signal be passed to the |
2940 | child) | |
2941 | -- or -- | |
2942 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2943 | decided we should resume from it. | |
d4f3574e | 2944 | |
c36b740a | 2945 | We're going to run this baby now! |
d4f3574e | 2946 | |
c36b740a VP |
2947 | Note that insert_breakpoints won't try to re-insert |
2948 | already inserted breakpoints. Therefore, we don't | |
2949 | care if breakpoints were already inserted, or not. */ | |
2950 | ||
45e8c884 VP |
2951 | if (ecs->stepping_over_breakpoint) |
2952 | { | |
2953 | remove_breakpoints (); | |
2954 | } | |
2955 | else | |
d4f3574e | 2956 | { |
e236ba44 | 2957 | struct gdb_exception e; |
569631c6 UW |
2958 | /* Stop stepping when inserting breakpoints |
2959 | has failed. */ | |
e236ba44 VP |
2960 | TRY_CATCH (e, RETURN_MASK_ERROR) |
2961 | { | |
2962 | insert_breakpoints (); | |
2963 | } | |
2964 | if (e.reason < 0) | |
d4f3574e SS |
2965 | { |
2966 | stop_stepping (ecs); | |
2967 | return; | |
2968 | } | |
d4f3574e SS |
2969 | } |
2970 | ||
ca67fcb8 | 2971 | stepping_over_breakpoint = ecs->stepping_over_breakpoint; |
d4f3574e SS |
2972 | |
2973 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2974 | specifies that such a signal should be delivered to the |
2975 | target program). | |
2976 | ||
2977 | Typically, this would occure when a user is debugging a | |
2978 | target monitor on a simulator: the target monitor sets a | |
2979 | breakpoint; the simulator encounters this break-point and | |
2980 | halts the simulation handing control to GDB; GDB, noteing | |
2981 | that the break-point isn't valid, returns control back to the | |
2982 | simulator; the simulator then delivers the hardware | |
2983 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2984 | ||
2985 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2986 | stop_signal = TARGET_SIGNAL_0; |
2987 | ||
d4f3574e SS |
2988 | |
2989 | resume (currently_stepping (ecs), stop_signal); | |
2990 | } | |
2991 | ||
488f131b | 2992 | prepare_to_wait (ecs); |
d4f3574e SS |
2993 | } |
2994 | ||
104c1213 JM |
2995 | /* This function normally comes after a resume, before |
2996 | handle_inferior_event exits. It takes care of any last bits of | |
2997 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2998 | |
104c1213 JM |
2999 | static void |
3000 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 3001 | { |
527159b7 | 3002 | if (debug_infrun) |
8a9de0e4 | 3003 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 JM |
3004 | if (ecs->infwait_state == infwait_normal_state) |
3005 | { | |
3006 | overlay_cache_invalid = 1; | |
3007 | ||
3008 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
3009 | target_wait because they can be loaded from the target while |
3010 | in target_wait. This makes remote debugging a bit more | |
3011 | efficient for those targets that provide critical registers | |
3012 | as part of their normal status mechanism. */ | |
104c1213 JM |
3013 | |
3014 | registers_changed (); | |
39f77062 | 3015 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
3016 | ecs->wp = &(ecs->ws); |
3017 | } | |
3018 | /* This is the old end of the while loop. Let everybody know we | |
3019 | want to wait for the inferior some more and get called again | |
3020 | soon. */ | |
3021 | ecs->wait_some_more = 1; | |
c906108c | 3022 | } |
11cf8741 JM |
3023 | |
3024 | /* Print why the inferior has stopped. We always print something when | |
3025 | the inferior exits, or receives a signal. The rest of the cases are | |
3026 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
3027 | there should be a call to this function from handle_inferior_event() | |
3028 | each time stop_stepping() is called.*/ | |
3029 | static void | |
3030 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
3031 | { | |
3032 | switch (stop_reason) | |
3033 | { | |
11cf8741 JM |
3034 | case END_STEPPING_RANGE: |
3035 | /* We are done with a step/next/si/ni command. */ | |
3036 | /* For now print nothing. */ | |
fb40c209 | 3037 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 3038 | operation for n > 1 */ |
fb40c209 | 3039 | if (!step_multi || !stop_step) |
9dc5e2a9 | 3040 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3041 | ui_out_field_string |
3042 | (uiout, "reason", | |
3043 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
11cf8741 | 3044 | break; |
11cf8741 JM |
3045 | case SIGNAL_EXITED: |
3046 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 3047 | annotate_signalled (); |
9dc5e2a9 | 3048 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3049 | ui_out_field_string |
3050 | (uiout, "reason", | |
3051 | async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8b93c638 JM |
3052 | ui_out_text (uiout, "\nProgram terminated with signal "); |
3053 | annotate_signal_name (); | |
488f131b JB |
3054 | ui_out_field_string (uiout, "signal-name", |
3055 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3056 | annotate_signal_name_end (); |
3057 | ui_out_text (uiout, ", "); | |
3058 | annotate_signal_string (); | |
488f131b JB |
3059 | ui_out_field_string (uiout, "signal-meaning", |
3060 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3061 | annotate_signal_string_end (); |
3062 | ui_out_text (uiout, ".\n"); | |
3063 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
3064 | break; |
3065 | case EXITED: | |
3066 | /* The inferior program is finished. */ | |
8b93c638 JM |
3067 | annotate_exited (stop_info); |
3068 | if (stop_info) | |
3069 | { | |
9dc5e2a9 | 3070 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3071 | ui_out_field_string (uiout, "reason", |
3072 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
8b93c638 | 3073 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
3074 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
3075 | (unsigned int) stop_info); | |
8b93c638 JM |
3076 | ui_out_text (uiout, ".\n"); |
3077 | } | |
3078 | else | |
3079 | { | |
9dc5e2a9 | 3080 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3081 | ui_out_field_string |
3082 | (uiout, "reason", | |
3083 | async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
8b93c638 JM |
3084 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
3085 | } | |
f17517ea AS |
3086 | /* Support the --return-child-result option. */ |
3087 | return_child_result_value = stop_info; | |
11cf8741 JM |
3088 | break; |
3089 | case SIGNAL_RECEIVED: | |
3090 | /* Signal received. The signal table tells us to print about | |
3091 | it. */ | |
8b93c638 JM |
3092 | annotate_signal (); |
3093 | ui_out_text (uiout, "\nProgram received signal "); | |
3094 | annotate_signal_name (); | |
84c6c83c | 3095 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3096 | ui_out_field_string |
3097 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b JB |
3098 | ui_out_field_string (uiout, "signal-name", |
3099 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3100 | annotate_signal_name_end (); |
3101 | ui_out_text (uiout, ", "); | |
3102 | annotate_signal_string (); | |
488f131b JB |
3103 | ui_out_field_string (uiout, "signal-meaning", |
3104 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3105 | annotate_signal_string_end (); |
3106 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
3107 | break; |
3108 | default: | |
8e65ff28 | 3109 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 3110 | _("print_stop_reason: unrecognized enum value")); |
11cf8741 JM |
3111 | break; |
3112 | } | |
3113 | } | |
c906108c | 3114 | \f |
43ff13b4 | 3115 | |
c906108c SS |
3116 | /* Here to return control to GDB when the inferior stops for real. |
3117 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3118 | ||
3119 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3120 | (pc, function, args, file, line number and line text). | |
3121 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3122 | attempting to insert breakpoints. */ | |
3123 | ||
3124 | void | |
96baa820 | 3125 | normal_stop (void) |
c906108c | 3126 | { |
73b65bb0 DJ |
3127 | struct target_waitstatus last; |
3128 | ptid_t last_ptid; | |
3129 | ||
3130 | get_last_target_status (&last_ptid, &last); | |
3131 | ||
c906108c SS |
3132 | /* As with the notification of thread events, we want to delay |
3133 | notifying the user that we've switched thread context until | |
3134 | the inferior actually stops. | |
3135 | ||
73b65bb0 DJ |
3136 | There's no point in saying anything if the inferior has exited. |
3137 | Note that SIGNALLED here means "exited with a signal", not | |
3138 | "received a signal". */ | |
488f131b | 3139 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
3140 | && target_has_execution |
3141 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
3142 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
3143 | { |
3144 | target_terminal_ours_for_output (); | |
a3f17187 | 3145 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 3146 | target_pid_to_str (inferior_ptid)); |
39f77062 | 3147 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3148 | } |
c906108c | 3149 | |
4fa8626c | 3150 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
3151 | /* Make sure that the current_frame's pc is correct. This |
3152 | is a correction for setting up the frame info before doing | |
b798847d | 3153 | gdbarch_decr_pc_after_break */ |
b87efeee AC |
3154 | if (target_has_execution) |
3155 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
b798847d | 3156 | gdbarch_decr_pc_after_break, the program counter can change. Ask the |
b87efeee | 3157 | frame code to check for this and sort out any resultant mess. |
b798847d | 3158 | gdbarch_decr_pc_after_break needs to just go away. */ |
2f107107 | 3159 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 3160 | |
c36b740a | 3161 | if (target_has_execution) |
c906108c SS |
3162 | { |
3163 | if (remove_breakpoints ()) | |
3164 | { | |
3165 | target_terminal_ours_for_output (); | |
a3f17187 AC |
3166 | printf_filtered (_("\ |
3167 | Cannot remove breakpoints because program is no longer writable.\n\ | |
3168 | It might be running in another process.\n\ | |
3169 | Further execution is probably impossible.\n")); | |
c906108c SS |
3170 | } |
3171 | } | |
c906108c SS |
3172 | |
3173 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3174 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3175 | ||
3176 | breakpoint_auto_delete (stop_bpstat); | |
3177 | ||
3178 | /* If an auto-display called a function and that got a signal, | |
3179 | delete that auto-display to avoid an infinite recursion. */ | |
3180 | ||
3181 | if (stopped_by_random_signal) | |
3182 | disable_current_display (); | |
3183 | ||
3184 | /* Don't print a message if in the middle of doing a "step n" | |
3185 | operation for n > 1 */ | |
3186 | if (step_multi && stop_step) | |
3187 | goto done; | |
3188 | ||
3189 | target_terminal_ours (); | |
3190 | ||
7abfe014 DJ |
3191 | /* Set the current source location. This will also happen if we |
3192 | display the frame below, but the current SAL will be incorrect | |
3193 | during a user hook-stop function. */ | |
3194 | if (target_has_stack && !stop_stack_dummy) | |
3195 | set_current_sal_from_frame (get_current_frame (), 1); | |
3196 | ||
5913bcb0 AC |
3197 | /* Look up the hook_stop and run it (CLI internally handles problem |
3198 | of stop_command's pre-hook not existing). */ | |
3199 | if (stop_command) | |
3200 | catch_errors (hook_stop_stub, stop_command, | |
3201 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3202 | |
3203 | if (!target_has_stack) | |
3204 | { | |
3205 | ||
3206 | goto done; | |
3207 | } | |
3208 | ||
3209 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3210 | and current location is based on that. | |
3211 | Don't do this on return from a stack dummy routine, | |
3212 | or if the program has exited. */ | |
3213 | ||
3214 | if (!stop_stack_dummy) | |
3215 | { | |
0f7d239c | 3216 | select_frame (get_current_frame ()); |
c906108c SS |
3217 | |
3218 | /* Print current location without a level number, if | |
c5aa993b JM |
3219 | we have changed functions or hit a breakpoint. |
3220 | Print source line if we have one. | |
3221 | bpstat_print() contains the logic deciding in detail | |
3222 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3223 | |
206415a3 | 3224 | if (stop_print_frame) |
c906108c SS |
3225 | { |
3226 | int bpstat_ret; | |
3227 | int source_flag; | |
917317f4 | 3228 | int do_frame_printing = 1; |
c906108c SS |
3229 | |
3230 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3231 | switch (bpstat_ret) |
3232 | { | |
3233 | case PRINT_UNKNOWN: | |
b0f4b84b DJ |
3234 | /* If we had hit a shared library event breakpoint, |
3235 | bpstat_print would print out this message. If we hit | |
3236 | an OS-level shared library event, do the same | |
3237 | thing. */ | |
3238 | if (last.kind == TARGET_WAITKIND_LOADED) | |
3239 | { | |
3240 | printf_filtered (_("Stopped due to shared library event\n")); | |
3241 | source_flag = SRC_LINE; /* something bogus */ | |
3242 | do_frame_printing = 0; | |
3243 | break; | |
3244 | } | |
3245 | ||
aa0cd9c1 | 3246 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
3247 | (or should) carry around the function and does (or |
3248 | should) use that when doing a frame comparison. */ | |
917317f4 | 3249 | if (stop_step |
aa0cd9c1 AC |
3250 | && frame_id_eq (step_frame_id, |
3251 | get_frame_id (get_current_frame ())) | |
917317f4 | 3252 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3253 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3254 | else |
488f131b | 3255 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3256 | break; |
3257 | case PRINT_SRC_AND_LOC: | |
488f131b | 3258 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3259 | break; |
3260 | case PRINT_SRC_ONLY: | |
c5394b80 | 3261 | source_flag = SRC_LINE; |
917317f4 JM |
3262 | break; |
3263 | case PRINT_NOTHING: | |
488f131b | 3264 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3265 | do_frame_printing = 0; |
3266 | break; | |
3267 | default: | |
e2e0b3e5 | 3268 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 3269 | } |
c906108c | 3270 | |
9dc5e2a9 | 3271 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3272 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3273 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3274 | /* The behavior of this routine with respect to the source |
3275 | flag is: | |
c5394b80 JM |
3276 | SRC_LINE: Print only source line |
3277 | LOCATION: Print only location | |
3278 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3279 | if (do_frame_printing) |
b04f3ab4 | 3280 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
3281 | |
3282 | /* Display the auto-display expressions. */ | |
3283 | do_displays (); | |
3284 | } | |
3285 | } | |
3286 | ||
3287 | /* Save the function value return registers, if we care. | |
3288 | We might be about to restore their previous contents. */ | |
3289 | if (proceed_to_finish) | |
d5c31457 UW |
3290 | { |
3291 | /* This should not be necessary. */ | |
3292 | if (stop_registers) | |
3293 | regcache_xfree (stop_registers); | |
3294 | ||
3295 | /* NB: The copy goes through to the target picking up the value of | |
3296 | all the registers. */ | |
3297 | stop_registers = regcache_dup (get_current_regcache ()); | |
3298 | } | |
c906108c SS |
3299 | |
3300 | if (stop_stack_dummy) | |
3301 | { | |
dbe9fe58 AC |
3302 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3303 | ends with a setting of the current frame, so we can use that | |
3304 | next. */ | |
3305 | frame_pop (get_current_frame ()); | |
c906108c | 3306 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3307 | Can't rely on restore_inferior_status because that only gets |
3308 | called if we don't stop in the called function. */ | |
c906108c | 3309 | stop_pc = read_pc (); |
0f7d239c | 3310 | select_frame (get_current_frame ()); |
c906108c SS |
3311 | } |
3312 | ||
c906108c SS |
3313 | done: |
3314 | annotate_stopped (); | |
7a464420 | 3315 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3316 | } |
3317 | ||
3318 | static int | |
96baa820 | 3319 | hook_stop_stub (void *cmd) |
c906108c | 3320 | { |
5913bcb0 | 3321 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3322 | return (0); |
3323 | } | |
3324 | \f | |
c5aa993b | 3325 | int |
96baa820 | 3326 | signal_stop_state (int signo) |
c906108c SS |
3327 | { |
3328 | return signal_stop[signo]; | |
3329 | } | |
3330 | ||
c5aa993b | 3331 | int |
96baa820 | 3332 | signal_print_state (int signo) |
c906108c SS |
3333 | { |
3334 | return signal_print[signo]; | |
3335 | } | |
3336 | ||
c5aa993b | 3337 | int |
96baa820 | 3338 | signal_pass_state (int signo) |
c906108c SS |
3339 | { |
3340 | return signal_program[signo]; | |
3341 | } | |
3342 | ||
488f131b | 3343 | int |
7bda5e4a | 3344 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3345 | { |
3346 | int ret = signal_stop[signo]; | |
3347 | signal_stop[signo] = state; | |
3348 | return ret; | |
3349 | } | |
3350 | ||
488f131b | 3351 | int |
7bda5e4a | 3352 | signal_print_update (int signo, int state) |
d4f3574e SS |
3353 | { |
3354 | int ret = signal_print[signo]; | |
3355 | signal_print[signo] = state; | |
3356 | return ret; | |
3357 | } | |
3358 | ||
488f131b | 3359 | int |
7bda5e4a | 3360 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3361 | { |
3362 | int ret = signal_program[signo]; | |
3363 | signal_program[signo] = state; | |
3364 | return ret; | |
3365 | } | |
3366 | ||
c906108c | 3367 | static void |
96baa820 | 3368 | sig_print_header (void) |
c906108c | 3369 | { |
a3f17187 AC |
3370 | printf_filtered (_("\ |
3371 | Signal Stop\tPrint\tPass to program\tDescription\n")); | |
c906108c SS |
3372 | } |
3373 | ||
3374 | static void | |
96baa820 | 3375 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3376 | { |
3377 | char *name = target_signal_to_name (oursig); | |
3378 | int name_padding = 13 - strlen (name); | |
96baa820 | 3379 | |
c906108c SS |
3380 | if (name_padding <= 0) |
3381 | name_padding = 0; | |
3382 | ||
3383 | printf_filtered ("%s", name); | |
488f131b | 3384 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3385 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3386 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3387 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3388 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3389 | } | |
3390 | ||
3391 | /* Specify how various signals in the inferior should be handled. */ | |
3392 | ||
3393 | static void | |
96baa820 | 3394 | handle_command (char *args, int from_tty) |
c906108c SS |
3395 | { |
3396 | char **argv; | |
3397 | int digits, wordlen; | |
3398 | int sigfirst, signum, siglast; | |
3399 | enum target_signal oursig; | |
3400 | int allsigs; | |
3401 | int nsigs; | |
3402 | unsigned char *sigs; | |
3403 | struct cleanup *old_chain; | |
3404 | ||
3405 | if (args == NULL) | |
3406 | { | |
e2e0b3e5 | 3407 | error_no_arg (_("signal to handle")); |
c906108c SS |
3408 | } |
3409 | ||
3410 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3411 | ||
3412 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3413 | sigs = (unsigned char *) alloca (nsigs); | |
3414 | memset (sigs, 0, nsigs); | |
3415 | ||
3416 | /* Break the command line up into args. */ | |
3417 | ||
3418 | argv = buildargv (args); | |
3419 | if (argv == NULL) | |
3420 | { | |
3421 | nomem (0); | |
3422 | } | |
7a292a7a | 3423 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3424 | |
3425 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3426 | actions. Signal numbers and signal names may be interspersed with | |
3427 | actions, with the actions being performed for all signals cumulatively | |
3428 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3429 | ||
3430 | while (*argv != NULL) | |
3431 | { | |
3432 | wordlen = strlen (*argv); | |
3433 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3434 | {; | |
3435 | } | |
3436 | allsigs = 0; | |
3437 | sigfirst = siglast = -1; | |
3438 | ||
3439 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3440 | { | |
3441 | /* Apply action to all signals except those used by the | |
3442 | debugger. Silently skip those. */ | |
3443 | allsigs = 1; | |
3444 | sigfirst = 0; | |
3445 | siglast = nsigs - 1; | |
3446 | } | |
3447 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3448 | { | |
3449 | SET_SIGS (nsigs, sigs, signal_stop); | |
3450 | SET_SIGS (nsigs, sigs, signal_print); | |
3451 | } | |
3452 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3453 | { | |
3454 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3455 | } | |
3456 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3457 | { | |
3458 | SET_SIGS (nsigs, sigs, signal_print); | |
3459 | } | |
3460 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3461 | { | |
3462 | SET_SIGS (nsigs, sigs, signal_program); | |
3463 | } | |
3464 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3465 | { | |
3466 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3467 | } | |
3468 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3469 | { | |
3470 | SET_SIGS (nsigs, sigs, signal_program); | |
3471 | } | |
3472 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3473 | { | |
3474 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3475 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3476 | } | |
3477 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3478 | { | |
3479 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3480 | } | |
3481 | else if (digits > 0) | |
3482 | { | |
3483 | /* It is numeric. The numeric signal refers to our own | |
3484 | internal signal numbering from target.h, not to host/target | |
3485 | signal number. This is a feature; users really should be | |
3486 | using symbolic names anyway, and the common ones like | |
3487 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3488 | ||
3489 | sigfirst = siglast = (int) | |
3490 | target_signal_from_command (atoi (*argv)); | |
3491 | if ((*argv)[digits] == '-') | |
3492 | { | |
3493 | siglast = (int) | |
3494 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3495 | } | |
3496 | if (sigfirst > siglast) | |
3497 | { | |
3498 | /* Bet he didn't figure we'd think of this case... */ | |
3499 | signum = sigfirst; | |
3500 | sigfirst = siglast; | |
3501 | siglast = signum; | |
3502 | } | |
3503 | } | |
3504 | else | |
3505 | { | |
3506 | oursig = target_signal_from_name (*argv); | |
3507 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3508 | { | |
3509 | sigfirst = siglast = (int) oursig; | |
3510 | } | |
3511 | else | |
3512 | { | |
3513 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 3514 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
3515 | } |
3516 | } | |
3517 | ||
3518 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3519 | which signals to apply actions to. */ |
c906108c SS |
3520 | |
3521 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3522 | { | |
3523 | switch ((enum target_signal) signum) | |
3524 | { | |
3525 | case TARGET_SIGNAL_TRAP: | |
3526 | case TARGET_SIGNAL_INT: | |
3527 | if (!allsigs && !sigs[signum]) | |
3528 | { | |
3529 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3530 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3531 | { |
3532 | sigs[signum] = 1; | |
3533 | } | |
3534 | else | |
3535 | { | |
a3f17187 | 3536 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
3537 | gdb_flush (gdb_stdout); |
3538 | } | |
3539 | } | |
3540 | break; | |
3541 | case TARGET_SIGNAL_0: | |
3542 | case TARGET_SIGNAL_DEFAULT: | |
3543 | case TARGET_SIGNAL_UNKNOWN: | |
3544 | /* Make sure that "all" doesn't print these. */ | |
3545 | break; | |
3546 | default: | |
3547 | sigs[signum] = 1; | |
3548 | break; | |
3549 | } | |
3550 | } | |
3551 | ||
3552 | argv++; | |
3553 | } | |
3554 | ||
39f77062 | 3555 | target_notice_signals (inferior_ptid); |
c906108c SS |
3556 | |
3557 | if (from_tty) | |
3558 | { | |
3559 | /* Show the results. */ | |
3560 | sig_print_header (); | |
3561 | for (signum = 0; signum < nsigs; signum++) | |
3562 | { | |
3563 | if (sigs[signum]) | |
3564 | { | |
3565 | sig_print_info (signum); | |
3566 | } | |
3567 | } | |
3568 | } | |
3569 | ||
3570 | do_cleanups (old_chain); | |
3571 | } | |
3572 | ||
3573 | static void | |
96baa820 | 3574 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3575 | { |
3576 | char **argv; | |
3577 | struct cleanup *old_chain; | |
3578 | ||
3579 | /* Break the command line up into args. */ | |
3580 | ||
3581 | argv = buildargv (args); | |
3582 | if (argv == NULL) | |
3583 | { | |
3584 | nomem (0); | |
3585 | } | |
7a292a7a | 3586 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3587 | if (argv[1] != (char *) NULL) |
3588 | { | |
3589 | char *argBuf; | |
3590 | int bufLen; | |
3591 | ||
3592 | bufLen = strlen (argv[0]) + 20; | |
3593 | argBuf = (char *) xmalloc (bufLen); | |
3594 | if (argBuf) | |
3595 | { | |
3596 | int validFlag = 1; | |
3597 | enum target_signal oursig; | |
3598 | ||
3599 | oursig = target_signal_from_name (argv[0]); | |
3600 | memset (argBuf, 0, bufLen); | |
3601 | if (strcmp (argv[1], "Q") == 0) | |
3602 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3603 | else | |
3604 | { | |
3605 | if (strcmp (argv[1], "s") == 0) | |
3606 | { | |
3607 | if (!signal_stop[oursig]) | |
3608 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3609 | else | |
3610 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3611 | } | |
3612 | else if (strcmp (argv[1], "i") == 0) | |
3613 | { | |
3614 | if (!signal_program[oursig]) | |
3615 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3616 | else | |
3617 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3618 | } | |
3619 | else if (strcmp (argv[1], "r") == 0) | |
3620 | { | |
3621 | if (!signal_print[oursig]) | |
3622 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3623 | else | |
3624 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3625 | } | |
3626 | else | |
3627 | validFlag = 0; | |
3628 | } | |
3629 | if (validFlag) | |
3630 | handle_command (argBuf, from_tty); | |
3631 | else | |
a3f17187 | 3632 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 3633 | if (argBuf) |
b8c9b27d | 3634 | xfree (argBuf); |
c906108c SS |
3635 | } |
3636 | } | |
3637 | do_cleanups (old_chain); | |
3638 | } | |
3639 | ||
3640 | /* Print current contents of the tables set by the handle command. | |
3641 | It is possible we should just be printing signals actually used | |
3642 | by the current target (but for things to work right when switching | |
3643 | targets, all signals should be in the signal tables). */ | |
3644 | ||
3645 | static void | |
96baa820 | 3646 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3647 | { |
3648 | enum target_signal oursig; | |
3649 | sig_print_header (); | |
3650 | ||
3651 | if (signum_exp) | |
3652 | { | |
3653 | /* First see if this is a symbol name. */ | |
3654 | oursig = target_signal_from_name (signum_exp); | |
3655 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3656 | { | |
3657 | /* No, try numeric. */ | |
3658 | oursig = | |
bb518678 | 3659 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3660 | } |
3661 | sig_print_info (oursig); | |
3662 | return; | |
3663 | } | |
3664 | ||
3665 | printf_filtered ("\n"); | |
3666 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3667 | for (oursig = TARGET_SIGNAL_FIRST; | |
3668 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3669 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3670 | { | |
3671 | QUIT; | |
3672 | ||
3673 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3674 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3675 | sig_print_info (oursig); |
3676 | } | |
3677 | ||
a3f17187 | 3678 | printf_filtered (_("\nUse the \"handle\" command to change these tables.\n")); |
c906108c SS |
3679 | } |
3680 | \f | |
7a292a7a SS |
3681 | struct inferior_status |
3682 | { | |
3683 | enum target_signal stop_signal; | |
3684 | CORE_ADDR stop_pc; | |
3685 | bpstat stop_bpstat; | |
3686 | int stop_step; | |
3687 | int stop_stack_dummy; | |
3688 | int stopped_by_random_signal; | |
ca67fcb8 | 3689 | int stepping_over_breakpoint; |
7a292a7a SS |
3690 | CORE_ADDR step_range_start; |
3691 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3692 | struct frame_id step_frame_id; |
5fbbeb29 | 3693 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3694 | CORE_ADDR step_resume_break_address; |
3695 | int stop_after_trap; | |
c0236d92 | 3696 | int stop_soon; |
7a292a7a SS |
3697 | |
3698 | /* These are here because if call_function_by_hand has written some | |
3699 | registers and then decides to call error(), we better not have changed | |
3700 | any registers. */ | |
72cec141 | 3701 | struct regcache *registers; |
7a292a7a | 3702 | |
101dcfbe AC |
3703 | /* A frame unique identifier. */ |
3704 | struct frame_id selected_frame_id; | |
3705 | ||
7a292a7a SS |
3706 | int breakpoint_proceeded; |
3707 | int restore_stack_info; | |
3708 | int proceed_to_finish; | |
3709 | }; | |
3710 | ||
7a292a7a | 3711 | void |
96baa820 JM |
3712 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3713 | LONGEST val) | |
7a292a7a | 3714 | { |
3acba339 | 3715 | int size = register_size (current_gdbarch, regno); |
7a292a7a SS |
3716 | void *buf = alloca (size); |
3717 | store_signed_integer (buf, size, val); | |
0818c12a | 3718 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3719 | } |
3720 | ||
c906108c SS |
3721 | /* Save all of the information associated with the inferior<==>gdb |
3722 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3723 | (defined in inferior.h). */ | |
3724 | ||
7a292a7a | 3725 | struct inferior_status * |
96baa820 | 3726 | save_inferior_status (int restore_stack_info) |
c906108c | 3727 | { |
72cec141 | 3728 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3729 | |
c906108c SS |
3730 | inf_status->stop_signal = stop_signal; |
3731 | inf_status->stop_pc = stop_pc; | |
3732 | inf_status->stop_step = stop_step; | |
3733 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3734 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
ca67fcb8 | 3735 | inf_status->stepping_over_breakpoint = stepping_over_breakpoint; |
c906108c SS |
3736 | inf_status->step_range_start = step_range_start; |
3737 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3738 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3739 | inf_status->step_over_calls = step_over_calls; |
3740 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3741 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3742 | /* Save original bpstat chain here; replace it with copy of chain. |
3743 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3744 | hand them back the original chain when restore_inferior_status is |
3745 | called. */ | |
c906108c SS |
3746 | inf_status->stop_bpstat = stop_bpstat; |
3747 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3748 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3749 | inf_status->restore_stack_info = restore_stack_info; | |
3750 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3751 | |
594f7785 | 3752 | inf_status->registers = regcache_dup (get_current_regcache ()); |
c906108c | 3753 | |
206415a3 | 3754 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
7a292a7a | 3755 | return inf_status; |
c906108c SS |
3756 | } |
3757 | ||
c906108c | 3758 | static int |
96baa820 | 3759 | restore_selected_frame (void *args) |
c906108c | 3760 | { |
488f131b | 3761 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3762 | struct frame_info *frame; |
c906108c | 3763 | |
101dcfbe | 3764 | frame = frame_find_by_id (*fid); |
c906108c | 3765 | |
aa0cd9c1 AC |
3766 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3767 | selected frame. */ | |
101dcfbe | 3768 | if (frame == NULL) |
c906108c | 3769 | { |
8a3fe4f8 | 3770 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
3771 | return 0; |
3772 | } | |
3773 | ||
0f7d239c | 3774 | select_frame (frame); |
c906108c SS |
3775 | |
3776 | return (1); | |
3777 | } | |
3778 | ||
3779 | void | |
96baa820 | 3780 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3781 | { |
3782 | stop_signal = inf_status->stop_signal; | |
3783 | stop_pc = inf_status->stop_pc; | |
3784 | stop_step = inf_status->stop_step; | |
3785 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3786 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
ca67fcb8 | 3787 | stepping_over_breakpoint = inf_status->stepping_over_breakpoint; |
c906108c SS |
3788 | step_range_start = inf_status->step_range_start; |
3789 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3790 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3791 | step_over_calls = inf_status->step_over_calls; |
3792 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3793 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3794 | bpstat_clear (&stop_bpstat); |
3795 | stop_bpstat = inf_status->stop_bpstat; | |
3796 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3797 | proceed_to_finish = inf_status->proceed_to_finish; | |
3798 | ||
c906108c SS |
3799 | /* The inferior can be gone if the user types "print exit(0)" |
3800 | (and perhaps other times). */ | |
3801 | if (target_has_execution) | |
72cec141 | 3802 | /* NB: The register write goes through to the target. */ |
594f7785 | 3803 | regcache_cpy (get_current_regcache (), inf_status->registers); |
72cec141 | 3804 | regcache_xfree (inf_status->registers); |
c906108c | 3805 | |
c906108c SS |
3806 | /* FIXME: If we are being called after stopping in a function which |
3807 | is called from gdb, we should not be trying to restore the | |
3808 | selected frame; it just prints a spurious error message (The | |
3809 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3810 | clobbers the stack)). In fact, should we be restoring the | |
3811 | inferior status at all in that case? . */ | |
3812 | ||
3813 | if (target_has_stack && inf_status->restore_stack_info) | |
3814 | { | |
c906108c | 3815 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3816 | walking the stack might encounter a garbage pointer and |
3817 | error() trying to dereference it. */ | |
488f131b JB |
3818 | if (catch_errors |
3819 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3820 | "Unable to restore previously selected frame:\n", | |
3821 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3822 | /* Error in restoring the selected frame. Select the innermost |
3823 | frame. */ | |
0f7d239c | 3824 | select_frame (get_current_frame ()); |
c906108c SS |
3825 | |
3826 | } | |
c906108c | 3827 | |
72cec141 | 3828 | xfree (inf_status); |
7a292a7a | 3829 | } |
c906108c | 3830 | |
74b7792f AC |
3831 | static void |
3832 | do_restore_inferior_status_cleanup (void *sts) | |
3833 | { | |
3834 | restore_inferior_status (sts); | |
3835 | } | |
3836 | ||
3837 | struct cleanup * | |
3838 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3839 | { | |
3840 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3841 | } | |
3842 | ||
c906108c | 3843 | void |
96baa820 | 3844 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3845 | { |
3846 | /* See save_inferior_status for info on stop_bpstat. */ | |
3847 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 | 3848 | regcache_xfree (inf_status->registers); |
72cec141 | 3849 | xfree (inf_status); |
7a292a7a SS |
3850 | } |
3851 | ||
47932f85 DJ |
3852 | int |
3853 | inferior_has_forked (int pid, int *child_pid) | |
3854 | { | |
3855 | struct target_waitstatus last; | |
3856 | ptid_t last_ptid; | |
3857 | ||
3858 | get_last_target_status (&last_ptid, &last); | |
3859 | ||
3860 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3861 | return 0; | |
3862 | ||
3863 | if (ptid_get_pid (last_ptid) != pid) | |
3864 | return 0; | |
3865 | ||
3866 | *child_pid = last.value.related_pid; | |
3867 | return 1; | |
3868 | } | |
3869 | ||
3870 | int | |
3871 | inferior_has_vforked (int pid, int *child_pid) | |
3872 | { | |
3873 | struct target_waitstatus last; | |
3874 | ptid_t last_ptid; | |
3875 | ||
3876 | get_last_target_status (&last_ptid, &last); | |
3877 | ||
3878 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3879 | return 0; | |
3880 | ||
3881 | if (ptid_get_pid (last_ptid) != pid) | |
3882 | return 0; | |
3883 | ||
3884 | *child_pid = last.value.related_pid; | |
3885 | return 1; | |
3886 | } | |
3887 | ||
3888 | int | |
3889 | inferior_has_execd (int pid, char **execd_pathname) | |
3890 | { | |
3891 | struct target_waitstatus last; | |
3892 | ptid_t last_ptid; | |
3893 | ||
3894 | get_last_target_status (&last_ptid, &last); | |
3895 | ||
3896 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3897 | return 0; | |
3898 | ||
3899 | if (ptid_get_pid (last_ptid) != pid) | |
3900 | return 0; | |
3901 | ||
3902 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3903 | return 1; | |
3904 | } | |
3905 | ||
ca6724c1 KB |
3906 | /* Oft used ptids */ |
3907 | ptid_t null_ptid; | |
3908 | ptid_t minus_one_ptid; | |
3909 | ||
3910 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3911 | |
ca6724c1 KB |
3912 | ptid_t |
3913 | ptid_build (int pid, long lwp, long tid) | |
3914 | { | |
3915 | ptid_t ptid; | |
3916 | ||
3917 | ptid.pid = pid; | |
3918 | ptid.lwp = lwp; | |
3919 | ptid.tid = tid; | |
3920 | return ptid; | |
3921 | } | |
3922 | ||
3923 | /* Create a ptid from just a pid. */ | |
3924 | ||
3925 | ptid_t | |
3926 | pid_to_ptid (int pid) | |
3927 | { | |
3928 | return ptid_build (pid, 0, 0); | |
3929 | } | |
3930 | ||
3931 | /* Fetch the pid (process id) component from a ptid. */ | |
3932 | ||
3933 | int | |
3934 | ptid_get_pid (ptid_t ptid) | |
3935 | { | |
3936 | return ptid.pid; | |
3937 | } | |
3938 | ||
3939 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3940 | ||
3941 | long | |
3942 | ptid_get_lwp (ptid_t ptid) | |
3943 | { | |
3944 | return ptid.lwp; | |
3945 | } | |
3946 | ||
3947 | /* Fetch the tid (thread id) component from a ptid. */ | |
3948 | ||
3949 | long | |
3950 | ptid_get_tid (ptid_t ptid) | |
3951 | { | |
3952 | return ptid.tid; | |
3953 | } | |
3954 | ||
3955 | /* ptid_equal() is used to test equality of two ptids. */ | |
3956 | ||
3957 | int | |
3958 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3959 | { | |
3960 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3961 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3962 | } |
3963 | ||
3964 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3965 | to restore the inferior_ptid value saved in a call to | |
3966 | save_inferior_ptid(). */ | |
ce696e05 KB |
3967 | |
3968 | static void | |
3969 | restore_inferior_ptid (void *arg) | |
3970 | { | |
3971 | ptid_t *saved_ptid_ptr = arg; | |
3972 | inferior_ptid = *saved_ptid_ptr; | |
3973 | xfree (arg); | |
3974 | } | |
3975 | ||
3976 | /* Save the value of inferior_ptid so that it may be restored by a | |
3977 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3978 | needed for later doing the cleanup. */ | |
3979 | ||
3980 | struct cleanup * | |
3981 | save_inferior_ptid (void) | |
3982 | { | |
3983 | ptid_t *saved_ptid_ptr; | |
3984 | ||
3985 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3986 | *saved_ptid_ptr = inferior_ptid; | |
3987 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3988 | } | |
c5aa993b | 3989 | \f |
488f131b | 3990 | |
c906108c | 3991 | void |
96baa820 | 3992 | _initialize_infrun (void) |
c906108c | 3993 | { |
52f0bd74 AC |
3994 | int i; |
3995 | int numsigs; | |
c906108c SS |
3996 | struct cmd_list_element *c; |
3997 | ||
1bedd215 AC |
3998 | add_info ("signals", signals_info, _("\ |
3999 | What debugger does when program gets various signals.\n\ | |
4000 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
4001 | add_info_alias ("handle", "signals", 0); |
4002 | ||
1bedd215 AC |
4003 | add_com ("handle", class_run, handle_command, _("\ |
4004 | Specify how to handle a signal.\n\ | |
c906108c SS |
4005 | Args are signals and actions to apply to those signals.\n\ |
4006 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4007 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4008 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4009 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
4010 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
4011 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
c906108c SS |
4012 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
4013 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4014 | Print means print a message if this signal happens.\n\ | |
4015 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4016 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 4017 | Pass and Stop may be combined.")); |
c906108c SS |
4018 | if (xdb_commands) |
4019 | { | |
1bedd215 AC |
4020 | add_com ("lz", class_info, signals_info, _("\ |
4021 | What debugger does when program gets various signals.\n\ | |
4022 | Specify a signal as argument to print info on that signal only.")); | |
4023 | add_com ("z", class_run, xdb_handle_command, _("\ | |
4024 | Specify how to handle a signal.\n\ | |
c906108c SS |
4025 | Args are signals and actions to apply to those signals.\n\ |
4026 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4027 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4028 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4029 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
4030 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
4031 | Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
c906108c SS |
4032 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
4033 | nopass), \"Q\" (noprint)\n\ | |
4034 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4035 | Print means print a message if this signal happens.\n\ | |
4036 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4037 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 4038 | Pass and Stop may be combined.")); |
c906108c SS |
4039 | } |
4040 | ||
4041 | if (!dbx_commands) | |
1a966eab AC |
4042 | stop_command = add_cmd ("stop", class_obscure, |
4043 | not_just_help_class_command, _("\ | |
4044 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 4045 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 4046 | of the program stops."), &cmdlist); |
c906108c | 4047 | |
85c07804 AC |
4048 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
4049 | Set inferior debugging."), _("\ | |
4050 | Show inferior debugging."), _("\ | |
4051 | When non-zero, inferior specific debugging is enabled."), | |
4052 | NULL, | |
920d2a44 | 4053 | show_debug_infrun, |
85c07804 | 4054 | &setdebuglist, &showdebuglist); |
527159b7 | 4055 | |
c906108c | 4056 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 4057 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
4058 | signal_print = (unsigned char *) |
4059 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
4060 | signal_program = (unsigned char *) | |
4061 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
4062 | for (i = 0; i < numsigs; i++) | |
4063 | { | |
4064 | signal_stop[i] = 1; | |
4065 | signal_print[i] = 1; | |
4066 | signal_program[i] = 1; | |
4067 | } | |
4068 | ||
4069 | /* Signals caused by debugger's own actions | |
4070 | should not be given to the program afterwards. */ | |
4071 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4072 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4073 | ||
4074 | /* Signals that are not errors should not normally enter the debugger. */ | |
4075 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4076 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4077 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4078 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4079 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4080 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4081 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4082 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4083 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4084 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4085 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4086 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4087 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4088 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4089 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4090 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4091 | ||
cd0fc7c3 SS |
4092 | /* These signals are used internally by user-level thread |
4093 | implementations. (See signal(5) on Solaris.) Like the above | |
4094 | signals, a healthy program receives and handles them as part of | |
4095 | its normal operation. */ | |
4096 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4097 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4098 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4099 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4100 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4101 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4102 | ||
85c07804 AC |
4103 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
4104 | &stop_on_solib_events, _("\ | |
4105 | Set stopping for shared library events."), _("\ | |
4106 | Show stopping for shared library events."), _("\ | |
c906108c SS |
4107 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
4108 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
4109 | to the user would be loading/unloading of a new library."), |
4110 | NULL, | |
920d2a44 | 4111 | show_stop_on_solib_events, |
85c07804 | 4112 | &setlist, &showlist); |
c906108c | 4113 | |
7ab04401 AC |
4114 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
4115 | follow_fork_mode_kind_names, | |
4116 | &follow_fork_mode_string, _("\ | |
4117 | Set debugger response to a program call of fork or vfork."), _("\ | |
4118 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
4119 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
4120 | parent - the original process is debugged after a fork\n\ | |
4121 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 4122 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
4123 | By default, the debugger will follow the parent process."), |
4124 | NULL, | |
920d2a44 | 4125 | show_follow_fork_mode_string, |
7ab04401 AC |
4126 | &setlist, &showlist); |
4127 | ||
4128 | add_setshow_enum_cmd ("scheduler-locking", class_run, | |
4129 | scheduler_enums, &scheduler_mode, _("\ | |
4130 | Set mode for locking scheduler during execution."), _("\ | |
4131 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
4132 | off == no locking (threads may preempt at any time)\n\ |
4133 | on == full locking (no thread except the current thread may run)\n\ | |
4134 | step == scheduler locked during every single-step operation.\n\ | |
4135 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
4136 | Other threads may run while stepping over a function call ('next')."), |
4137 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 4138 | show_scheduler_mode, |
7ab04401 | 4139 | &setlist, &showlist); |
5fbbeb29 | 4140 | |
5bf193a2 AC |
4141 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
4142 | Set mode of the step operation."), _("\ | |
4143 | Show mode of the step operation."), _("\ | |
4144 | When set, doing a step over a function without debug line information\n\ | |
4145 | will stop at the first instruction of that function. Otherwise, the\n\ | |
4146 | function is skipped and the step command stops at a different source line."), | |
4147 | NULL, | |
920d2a44 | 4148 | show_step_stop_if_no_debug, |
5bf193a2 | 4149 | &setlist, &showlist); |
ca6724c1 KB |
4150 | |
4151 | /* ptid initializations */ | |
4152 | null_ptid = ptid_build (0, 0, 0); | |
4153 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4154 | inferior_ptid = null_ptid; | |
4155 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 4156 | } |