Commit | Line | Data |
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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 | 5 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
0fb0cc75 | 6 | 2008, 2009 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" |
9f976b41 | 48 | #include "gdb_assert.h" |
034dad6f | 49 | #include "mi/mi-common.h" |
4f8d22e3 | 50 | #include "event-top.h" |
96429cc8 | 51 | #include "record.h" |
c906108c SS |
52 | |
53 | /* Prototypes for local functions */ | |
54 | ||
96baa820 | 55 | static void signals_info (char *, int); |
c906108c | 56 | |
96baa820 | 57 | static void handle_command (char *, int); |
c906108c | 58 | |
96baa820 | 59 | static void sig_print_info (enum target_signal); |
c906108c | 60 | |
96baa820 | 61 | static void sig_print_header (void); |
c906108c | 62 | |
74b7792f | 63 | static void resume_cleanups (void *); |
c906108c | 64 | |
96baa820 | 65 | static int hook_stop_stub (void *); |
c906108c | 66 | |
96baa820 JM |
67 | static int restore_selected_frame (void *); |
68 | ||
69 | static void build_infrun (void); | |
70 | ||
4ef3f3be | 71 | static int follow_fork (void); |
96baa820 JM |
72 | |
73 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 74 | struct cmd_list_element *c); |
96baa820 | 75 | |
4e1c45ea | 76 | static int currently_stepping (struct thread_info *tp); |
96baa820 | 77 | |
b3444185 PA |
78 | static int currently_stepping_or_nexting_callback (struct thread_info *tp, |
79 | void *data); | |
a7212384 | 80 | |
96baa820 JM |
81 | static void xdb_handle_command (char *args, int from_tty); |
82 | ||
6a6b96b9 | 83 | static int prepare_to_proceed (int); |
ea67f13b | 84 | |
96baa820 | 85 | void _initialize_infrun (void); |
43ff13b4 | 86 | |
e58b0e63 PA |
87 | void nullify_last_target_wait_ptid (void); |
88 | ||
5fbbeb29 CF |
89 | /* When set, stop the 'step' command if we enter a function which has |
90 | no line number information. The normal behavior is that we step | |
91 | over such function. */ | |
92 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
93 | static void |
94 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
95 | struct cmd_list_element *c, const char *value) | |
96 | { | |
97 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
98 | } | |
5fbbeb29 | 99 | |
43ff13b4 | 100 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 101 | |
43ff13b4 JM |
102 | int sync_execution = 0; |
103 | ||
c906108c SS |
104 | /* wait_for_inferior and normal_stop use this to notify the user |
105 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
106 | running in. */ |
107 | ||
39f77062 | 108 | static ptid_t previous_inferior_ptid; |
7a292a7a | 109 | |
237fc4c9 PA |
110 | int debug_displaced = 0; |
111 | static void | |
112 | show_debug_displaced (struct ui_file *file, int from_tty, | |
113 | struct cmd_list_element *c, const char *value) | |
114 | { | |
115 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
116 | } | |
117 | ||
527159b7 | 118 | static int debug_infrun = 0; |
920d2a44 AC |
119 | static void |
120 | show_debug_infrun (struct ui_file *file, int from_tty, | |
121 | struct cmd_list_element *c, const char *value) | |
122 | { | |
123 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
124 | } | |
527159b7 | 125 | |
d4f3574e SS |
126 | /* If the program uses ELF-style shared libraries, then calls to |
127 | functions in shared libraries go through stubs, which live in a | |
128 | table called the PLT (Procedure Linkage Table). The first time the | |
129 | function is called, the stub sends control to the dynamic linker, | |
130 | which looks up the function's real address, patches the stub so | |
131 | that future calls will go directly to the function, and then passes | |
132 | control to the function. | |
133 | ||
134 | If we are stepping at the source level, we don't want to see any of | |
135 | this --- we just want to skip over the stub and the dynamic linker. | |
136 | The simple approach is to single-step until control leaves the | |
137 | dynamic linker. | |
138 | ||
ca557f44 AC |
139 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
140 | dynamic linker calls functions in the shared C library, so you | |
141 | can't tell from the PC alone whether the dynamic linker is still | |
142 | running. In this case, we use a step-resume breakpoint to get us | |
143 | past the dynamic linker, as if we were using "next" to step over a | |
144 | function call. | |
d4f3574e | 145 | |
cfd8ab24 | 146 | in_solib_dynsym_resolve_code() says whether we're in the dynamic |
d4f3574e SS |
147 | linker code or not. Normally, this means we single-step. However, |
148 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
149 | address where we can place a step-resume breakpoint to get past the | |
150 | linker's symbol resolution function. | |
151 | ||
cfd8ab24 | 152 | in_solib_dynsym_resolve_code() can generally be implemented in a |
d4f3574e SS |
153 | pretty portable way, by comparing the PC against the address ranges |
154 | of the dynamic linker's sections. | |
155 | ||
156 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
157 | it depends on internal details of the dynamic linker. It's usually | |
158 | not too hard to figure out where to put a breakpoint, but it | |
159 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
160 | sanity checking. If it can't figure things out, returning zero and | |
161 | getting the (possibly confusing) stepping behavior is better than | |
162 | signalling an error, which will obscure the change in the | |
163 | inferior's state. */ | |
c906108c | 164 | |
c906108c SS |
165 | /* This function returns TRUE if pc is the address of an instruction |
166 | that lies within the dynamic linker (such as the event hook, or the | |
167 | dld itself). | |
168 | ||
169 | This function must be used only when a dynamic linker event has | |
170 | been caught, and the inferior is being stepped out of the hook, or | |
171 | undefined results are guaranteed. */ | |
172 | ||
173 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
174 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
175 | #endif | |
176 | ||
c2c6d25f | 177 | |
7a292a7a SS |
178 | /* Convert the #defines into values. This is temporary until wfi control |
179 | flow is completely sorted out. */ | |
180 | ||
692590c1 MS |
181 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
182 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
183 | #else | |
184 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
185 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
186 | #endif | |
187 | ||
c906108c SS |
188 | /* Tables of how to react to signals; the user sets them. */ |
189 | ||
190 | static unsigned char *signal_stop; | |
191 | static unsigned char *signal_print; | |
192 | static unsigned char *signal_program; | |
193 | ||
194 | #define SET_SIGS(nsigs,sigs,flags) \ | |
195 | do { \ | |
196 | int signum = (nsigs); \ | |
197 | while (signum-- > 0) \ | |
198 | if ((sigs)[signum]) \ | |
199 | (flags)[signum] = 1; \ | |
200 | } while (0) | |
201 | ||
202 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
203 | do { \ | |
204 | int signum = (nsigs); \ | |
205 | while (signum-- > 0) \ | |
206 | if ((sigs)[signum]) \ | |
207 | (flags)[signum] = 0; \ | |
208 | } while (0) | |
209 | ||
39f77062 KB |
210 | /* Value to pass to target_resume() to cause all threads to resume */ |
211 | ||
212 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
213 | |
214 | /* Command list pointer for the "stop" placeholder. */ | |
215 | ||
216 | static struct cmd_list_element *stop_command; | |
217 | ||
c906108c SS |
218 | /* Function inferior was in as of last step command. */ |
219 | ||
220 | static struct symbol *step_start_function; | |
221 | ||
c906108c SS |
222 | /* Nonzero if we want to give control to the user when we're notified |
223 | of shared library events by the dynamic linker. */ | |
224 | static int stop_on_solib_events; | |
920d2a44 AC |
225 | static void |
226 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
227 | struct cmd_list_element *c, const char *value) | |
228 | { | |
229 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
230 | value); | |
231 | } | |
c906108c | 232 | |
c906108c SS |
233 | /* Nonzero means expecting a trace trap |
234 | and should stop the inferior and return silently when it happens. */ | |
235 | ||
236 | int stop_after_trap; | |
237 | ||
642fd101 DE |
238 | /* Save register contents here when executing a "finish" command or are |
239 | about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set. | |
c906108c SS |
240 | Thus this contains the return value from the called function (assuming |
241 | values are returned in a register). */ | |
242 | ||
72cec141 | 243 | struct regcache *stop_registers; |
c906108c | 244 | |
c906108c SS |
245 | /* Nonzero after stop if current stack frame should be printed. */ |
246 | ||
247 | static int stop_print_frame; | |
248 | ||
e02bc4cc | 249 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
250 | returned by target_wait()/deprecated_target_wait_hook(). This |
251 | information is returned by get_last_target_status(). */ | |
39f77062 | 252 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
253 | static struct target_waitstatus target_last_waitstatus; |
254 | ||
0d1e5fa7 PA |
255 | static void context_switch (ptid_t ptid); |
256 | ||
4e1c45ea | 257 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 PA |
258 | |
259 | void init_infwait_state (void); | |
a474d7c2 | 260 | |
53904c9e AC |
261 | static const char follow_fork_mode_child[] = "child"; |
262 | static const char follow_fork_mode_parent[] = "parent"; | |
263 | ||
488f131b | 264 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
265 | follow_fork_mode_child, |
266 | follow_fork_mode_parent, | |
267 | NULL | |
ef346e04 | 268 | }; |
c906108c | 269 | |
53904c9e | 270 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
271 | static void |
272 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
273 | struct cmd_list_element *c, const char *value) | |
274 | { | |
275 | fprintf_filtered (file, _("\ | |
276 | Debugger response to a program call of fork or vfork is \"%s\".\n"), | |
277 | value); | |
278 | } | |
c906108c SS |
279 | \f |
280 | ||
e58b0e63 PA |
281 | /* Tell the target to follow the fork we're stopped at. Returns true |
282 | if the inferior should be resumed; false, if the target for some | |
283 | reason decided it's best not to resume. */ | |
284 | ||
6604731b | 285 | static int |
4ef3f3be | 286 | follow_fork (void) |
c906108c | 287 | { |
ea1dd7bc | 288 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
289 | int should_resume = 1; |
290 | struct thread_info *tp; | |
291 | ||
292 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
293 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
294 | parent thread structure's run control related fields, not just these. |
295 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
296 | struct breakpoint *step_resume_breakpoint = NULL; | |
297 | CORE_ADDR step_range_start = 0; | |
298 | CORE_ADDR step_range_end = 0; | |
299 | struct frame_id step_frame_id = { 0 }; | |
e58b0e63 PA |
300 | |
301 | if (!non_stop) | |
302 | { | |
303 | ptid_t wait_ptid; | |
304 | struct target_waitstatus wait_status; | |
305 | ||
306 | /* Get the last target status returned by target_wait(). */ | |
307 | get_last_target_status (&wait_ptid, &wait_status); | |
308 | ||
309 | /* If not stopped at a fork event, then there's nothing else to | |
310 | do. */ | |
311 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
312 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
313 | return 1; | |
314 | ||
315 | /* Check if we switched over from WAIT_PTID, since the event was | |
316 | reported. */ | |
317 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
318 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
319 | { | |
320 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
321 | target to follow it (in either direction). We'll | |
322 | afterwards refuse to resume, and inform the user what | |
323 | happened. */ | |
324 | switch_to_thread (wait_ptid); | |
325 | should_resume = 0; | |
326 | } | |
327 | } | |
328 | ||
329 | tp = inferior_thread (); | |
330 | ||
331 | /* If there were any forks/vforks that were caught and are now to be | |
332 | followed, then do so now. */ | |
333 | switch (tp->pending_follow.kind) | |
334 | { | |
335 | case TARGET_WAITKIND_FORKED: | |
336 | case TARGET_WAITKIND_VFORKED: | |
337 | { | |
338 | ptid_t parent, child; | |
339 | ||
340 | /* If the user did a next/step, etc, over a fork call, | |
341 | preserve the stepping state in the fork child. */ | |
342 | if (follow_child && should_resume) | |
343 | { | |
344 | step_resume_breakpoint | |
345 | = clone_momentary_breakpoint (tp->step_resume_breakpoint); | |
346 | step_range_start = tp->step_range_start; | |
347 | step_range_end = tp->step_range_end; | |
348 | step_frame_id = tp->step_frame_id; | |
349 | ||
350 | /* For now, delete the parent's sr breakpoint, otherwise, | |
351 | parent/child sr breakpoints are considered duplicates, | |
352 | and the child version will not be installed. Remove | |
353 | this when the breakpoints module becomes aware of | |
354 | inferiors and address spaces. */ | |
355 | delete_step_resume_breakpoint (tp); | |
356 | tp->step_range_start = 0; | |
357 | tp->step_range_end = 0; | |
358 | tp->step_frame_id = null_frame_id; | |
359 | } | |
360 | ||
361 | parent = inferior_ptid; | |
362 | child = tp->pending_follow.value.related_pid; | |
363 | ||
364 | /* Tell the target to do whatever is necessary to follow | |
365 | either parent or child. */ | |
366 | if (target_follow_fork (follow_child)) | |
367 | { | |
368 | /* Target refused to follow, or there's some other reason | |
369 | we shouldn't resume. */ | |
370 | should_resume = 0; | |
371 | } | |
372 | else | |
373 | { | |
374 | /* This pending follow fork event is now handled, one way | |
375 | or another. The previous selected thread may be gone | |
376 | from the lists by now, but if it is still around, need | |
377 | to clear the pending follow request. */ | |
e09875d4 | 378 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
379 | if (tp) |
380 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
381 | ||
382 | /* This makes sure we don't try to apply the "Switched | |
383 | over from WAIT_PID" logic above. */ | |
384 | nullify_last_target_wait_ptid (); | |
385 | ||
386 | /* If we followed the child, switch to it... */ | |
387 | if (follow_child) | |
388 | { | |
389 | switch_to_thread (child); | |
390 | ||
391 | /* ... and preserve the stepping state, in case the | |
392 | user was stepping over the fork call. */ | |
393 | if (should_resume) | |
394 | { | |
395 | tp = inferior_thread (); | |
396 | tp->step_resume_breakpoint = step_resume_breakpoint; | |
397 | tp->step_range_start = step_range_start; | |
398 | tp->step_range_end = step_range_end; | |
399 | tp->step_frame_id = step_frame_id; | |
400 | } | |
401 | else | |
402 | { | |
403 | /* If we get here, it was because we're trying to | |
404 | resume from a fork catchpoint, but, the user | |
405 | has switched threads away from the thread that | |
406 | forked. In that case, the resume command | |
407 | issued is most likely not applicable to the | |
408 | child, so just warn, and refuse to resume. */ | |
409 | warning (_("\ | |
410 | Not resuming: switched threads before following fork child.\n")); | |
411 | } | |
412 | ||
413 | /* Reset breakpoints in the child as appropriate. */ | |
414 | follow_inferior_reset_breakpoints (); | |
415 | } | |
416 | else | |
417 | switch_to_thread (parent); | |
418 | } | |
419 | } | |
420 | break; | |
421 | case TARGET_WAITKIND_SPURIOUS: | |
422 | /* Nothing to follow. */ | |
423 | break; | |
424 | default: | |
425 | internal_error (__FILE__, __LINE__, | |
426 | "Unexpected pending_follow.kind %d\n", | |
427 | tp->pending_follow.kind); | |
428 | break; | |
429 | } | |
c906108c | 430 | |
e58b0e63 | 431 | return should_resume; |
c906108c SS |
432 | } |
433 | ||
6604731b DJ |
434 | void |
435 | follow_inferior_reset_breakpoints (void) | |
c906108c | 436 | { |
4e1c45ea PA |
437 | struct thread_info *tp = inferior_thread (); |
438 | ||
6604731b DJ |
439 | /* Was there a step_resume breakpoint? (There was if the user |
440 | did a "next" at the fork() call.) If so, explicitly reset its | |
441 | thread number. | |
442 | ||
443 | step_resumes are a form of bp that are made to be per-thread. | |
444 | Since we created the step_resume bp when the parent process | |
445 | was being debugged, and now are switching to the child process, | |
446 | from the breakpoint package's viewpoint, that's a switch of | |
447 | "threads". We must update the bp's notion of which thread | |
448 | it is for, or it'll be ignored when it triggers. */ | |
449 | ||
4e1c45ea PA |
450 | if (tp->step_resume_breakpoint) |
451 | breakpoint_re_set_thread (tp->step_resume_breakpoint); | |
6604731b DJ |
452 | |
453 | /* Reinsert all breakpoints in the child. The user may have set | |
454 | breakpoints after catching the fork, in which case those | |
455 | were never set in the child, but only in the parent. This makes | |
456 | sure the inserted breakpoints match the breakpoint list. */ | |
457 | ||
458 | breakpoint_re_set (); | |
459 | insert_breakpoints (); | |
c906108c | 460 | } |
c906108c | 461 | |
1adeb98a FN |
462 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
463 | ||
c906108c | 464 | static void |
3a3e9ee3 | 465 | follow_exec (ptid_t pid, char *execd_pathname) |
c906108c | 466 | { |
7a292a7a | 467 | struct target_ops *tgt; |
4e1c45ea | 468 | struct thread_info *th = inferior_thread (); |
7a292a7a | 469 | |
c906108c SS |
470 | /* This is an exec event that we actually wish to pay attention to. |
471 | Refresh our symbol table to the newly exec'd program, remove any | |
472 | momentary bp's, etc. | |
473 | ||
474 | If there are breakpoints, they aren't really inserted now, | |
475 | since the exec() transformed our inferior into a fresh set | |
476 | of instructions. | |
477 | ||
478 | We want to preserve symbolic breakpoints on the list, since | |
479 | we have hopes that they can be reset after the new a.out's | |
480 | symbol table is read. | |
481 | ||
482 | However, any "raw" breakpoints must be removed from the list | |
483 | (e.g., the solib bp's), since their address is probably invalid | |
484 | now. | |
485 | ||
486 | And, we DON'T want to call delete_breakpoints() here, since | |
487 | that may write the bp's "shadow contents" (the instruction | |
488 | value that was overwritten witha TRAP instruction). Since | |
489 | we now have a new a.out, those shadow contents aren't valid. */ | |
490 | update_breakpoints_after_exec (); | |
491 | ||
492 | /* If there was one, it's gone now. We cannot truly step-to-next | |
493 | statement through an exec(). */ | |
4e1c45ea PA |
494 | th->step_resume_breakpoint = NULL; |
495 | th->step_range_start = 0; | |
496 | th->step_range_end = 0; | |
c906108c | 497 | |
a75724bc PA |
498 | /* The target reports the exec event to the main thread, even if |
499 | some other thread does the exec, and even if the main thread was | |
500 | already stopped --- if debugging in non-stop mode, it's possible | |
501 | the user had the main thread held stopped in the previous image | |
502 | --- release it now. This is the same behavior as step-over-exec | |
503 | with scheduler-locking on in all-stop mode. */ | |
504 | th->stop_requested = 0; | |
505 | ||
c906108c | 506 | /* What is this a.out's name? */ |
a3f17187 | 507 | printf_unfiltered (_("Executing new program: %s\n"), execd_pathname); |
c906108c SS |
508 | |
509 | /* We've followed the inferior through an exec. Therefore, the | |
510 | inferior has essentially been killed & reborn. */ | |
7a292a7a | 511 | |
c906108c | 512 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
513 | |
514 | breakpoint_init_inferior (inf_execd); | |
e85a822c DJ |
515 | |
516 | if (gdb_sysroot && *gdb_sysroot) | |
517 | { | |
518 | char *name = alloca (strlen (gdb_sysroot) | |
519 | + strlen (execd_pathname) | |
520 | + 1); | |
521 | strcpy (name, gdb_sysroot); | |
522 | strcat (name, execd_pathname); | |
523 | execd_pathname = name; | |
524 | } | |
c906108c SS |
525 | |
526 | /* That a.out is now the one to use. */ | |
527 | exec_file_attach (execd_pathname, 0); | |
528 | ||
cce9b6bf PA |
529 | /* Reset the shared library package. This ensures that we get a |
530 | shlib event when the child reaches "_start", at which point the | |
531 | dld will have had a chance to initialize the child. */ | |
532 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
533 | we don't want those to be satisfied by the libraries of the | |
534 | previous incarnation of this process. */ | |
535 | no_shared_libraries (NULL, 0); | |
536 | ||
537 | /* Load the main file's symbols. */ | |
1adeb98a | 538 | symbol_file_add_main (execd_pathname, 0); |
c906108c | 539 | |
7a292a7a | 540 | #ifdef SOLIB_CREATE_INFERIOR_HOOK |
39f77062 | 541 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
a77053c2 MK |
542 | #else |
543 | solib_create_inferior_hook (); | |
7a292a7a | 544 | #endif |
c906108c SS |
545 | |
546 | /* Reinsert all breakpoints. (Those which were symbolic have | |
547 | been reset to the proper address in the new a.out, thanks | |
548 | to symbol_file_command...) */ | |
549 | insert_breakpoints (); | |
550 | ||
551 | /* The next resume of this inferior should bring it to the shlib | |
552 | startup breakpoints. (If the user had also set bp's on | |
553 | "main" from the old (parent) process, then they'll auto- | |
554 | matically get reset there in the new process.) */ | |
c906108c SS |
555 | } |
556 | ||
557 | /* Non-zero if we just simulating a single-step. This is needed | |
558 | because we cannot remove the breakpoints in the inferior process | |
559 | until after the `wait' in `wait_for_inferior'. */ | |
560 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
561 | |
562 | /* The thread we inserted single-step breakpoints for. */ | |
563 | static ptid_t singlestep_ptid; | |
564 | ||
fd48f117 DJ |
565 | /* PC when we started this single-step. */ |
566 | static CORE_ADDR singlestep_pc; | |
567 | ||
9f976b41 DJ |
568 | /* If another thread hit the singlestep breakpoint, we save the original |
569 | thread here so that we can resume single-stepping it later. */ | |
570 | static ptid_t saved_singlestep_ptid; | |
571 | static int stepping_past_singlestep_breakpoint; | |
6a6b96b9 | 572 | |
ca67fcb8 VP |
573 | /* If not equal to null_ptid, this means that after stepping over breakpoint |
574 | is finished, we need to switch to deferred_step_ptid, and step it. | |
575 | ||
576 | The use case is when one thread has hit a breakpoint, and then the user | |
577 | has switched to another thread and issued 'step'. We need to step over | |
578 | breakpoint in the thread which hit the breakpoint, but then continue | |
579 | stepping the thread user has selected. */ | |
580 | static ptid_t deferred_step_ptid; | |
c906108c | 581 | \f |
237fc4c9 PA |
582 | /* Displaced stepping. */ |
583 | ||
584 | /* In non-stop debugging mode, we must take special care to manage | |
585 | breakpoints properly; in particular, the traditional strategy for | |
586 | stepping a thread past a breakpoint it has hit is unsuitable. | |
587 | 'Displaced stepping' is a tactic for stepping one thread past a | |
588 | breakpoint it has hit while ensuring that other threads running | |
589 | concurrently will hit the breakpoint as they should. | |
590 | ||
591 | The traditional way to step a thread T off a breakpoint in a | |
592 | multi-threaded program in all-stop mode is as follows: | |
593 | ||
594 | a0) Initially, all threads are stopped, and breakpoints are not | |
595 | inserted. | |
596 | a1) We single-step T, leaving breakpoints uninserted. | |
597 | a2) We insert breakpoints, and resume all threads. | |
598 | ||
599 | In non-stop debugging, however, this strategy is unsuitable: we | |
600 | don't want to have to stop all threads in the system in order to | |
601 | continue or step T past a breakpoint. Instead, we use displaced | |
602 | stepping: | |
603 | ||
604 | n0) Initially, T is stopped, other threads are running, and | |
605 | breakpoints are inserted. | |
606 | n1) We copy the instruction "under" the breakpoint to a separate | |
607 | location, outside the main code stream, making any adjustments | |
608 | to the instruction, register, and memory state as directed by | |
609 | T's architecture. | |
610 | n2) We single-step T over the instruction at its new location. | |
611 | n3) We adjust the resulting register and memory state as directed | |
612 | by T's architecture. This includes resetting T's PC to point | |
613 | back into the main instruction stream. | |
614 | n4) We resume T. | |
615 | ||
616 | This approach depends on the following gdbarch methods: | |
617 | ||
618 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
619 | indicate where to copy the instruction, and how much space must | |
620 | be reserved there. We use these in step n1. | |
621 | ||
622 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
623 | address, and makes any necessary adjustments to the instruction, | |
624 | register contents, and memory. We use this in step n1. | |
625 | ||
626 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
627 | we have successfuly single-stepped the instruction, to yield the | |
628 | same effect the instruction would have had if we had executed it | |
629 | at its original address. We use this in step n3. | |
630 | ||
631 | - gdbarch_displaced_step_free_closure provides cleanup. | |
632 | ||
633 | The gdbarch_displaced_step_copy_insn and | |
634 | gdbarch_displaced_step_fixup functions must be written so that | |
635 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
636 | single-stepping across the copied instruction, and then applying | |
637 | gdbarch_displaced_insn_fixup should have the same effects on the | |
638 | thread's memory and registers as stepping the instruction in place | |
639 | would have. Exactly which responsibilities fall to the copy and | |
640 | which fall to the fixup is up to the author of those functions. | |
641 | ||
642 | See the comments in gdbarch.sh for details. | |
643 | ||
644 | Note that displaced stepping and software single-step cannot | |
645 | currently be used in combination, although with some care I think | |
646 | they could be made to. Software single-step works by placing | |
647 | breakpoints on all possible subsequent instructions; if the | |
648 | displaced instruction is a PC-relative jump, those breakpoints | |
649 | could fall in very strange places --- on pages that aren't | |
650 | executable, or at addresses that are not proper instruction | |
651 | boundaries. (We do generally let other threads run while we wait | |
652 | to hit the software single-step breakpoint, and they might | |
653 | encounter such a corrupted instruction.) One way to work around | |
654 | this would be to have gdbarch_displaced_step_copy_insn fully | |
655 | simulate the effect of PC-relative instructions (and return NULL) | |
656 | on architectures that use software single-stepping. | |
657 | ||
658 | In non-stop mode, we can have independent and simultaneous step | |
659 | requests, so more than one thread may need to simultaneously step | |
660 | over a breakpoint. The current implementation assumes there is | |
661 | only one scratch space per process. In this case, we have to | |
662 | serialize access to the scratch space. If thread A wants to step | |
663 | over a breakpoint, but we are currently waiting for some other | |
664 | thread to complete a displaced step, we leave thread A stopped and | |
665 | place it in the displaced_step_request_queue. Whenever a displaced | |
666 | step finishes, we pick the next thread in the queue and start a new | |
667 | displaced step operation on it. See displaced_step_prepare and | |
668 | displaced_step_fixup for details. */ | |
669 | ||
670 | /* If this is not null_ptid, this is the thread carrying out a | |
671 | displaced single-step. This thread's state will require fixing up | |
672 | once it has completed its step. */ | |
673 | static ptid_t displaced_step_ptid; | |
674 | ||
675 | struct displaced_step_request | |
676 | { | |
677 | ptid_t ptid; | |
678 | struct displaced_step_request *next; | |
679 | }; | |
680 | ||
681 | /* A queue of pending displaced stepping requests. */ | |
682 | struct displaced_step_request *displaced_step_request_queue; | |
683 | ||
684 | /* The architecture the thread had when we stepped it. */ | |
685 | static struct gdbarch *displaced_step_gdbarch; | |
686 | ||
687 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
688 | for post-step cleanup. */ | |
689 | static struct displaced_step_closure *displaced_step_closure; | |
690 | ||
691 | /* The address of the original instruction, and the copy we made. */ | |
692 | static CORE_ADDR displaced_step_original, displaced_step_copy; | |
693 | ||
694 | /* Saved contents of copy area. */ | |
695 | static gdb_byte *displaced_step_saved_copy; | |
696 | ||
fff08868 HZ |
697 | /* Enum strings for "set|show displaced-stepping". */ |
698 | ||
699 | static const char can_use_displaced_stepping_auto[] = "auto"; | |
700 | static const char can_use_displaced_stepping_on[] = "on"; | |
701 | static const char can_use_displaced_stepping_off[] = "off"; | |
702 | static const char *can_use_displaced_stepping_enum[] = | |
703 | { | |
704 | can_use_displaced_stepping_auto, | |
705 | can_use_displaced_stepping_on, | |
706 | can_use_displaced_stepping_off, | |
707 | NULL, | |
708 | }; | |
709 | ||
710 | /* If ON, and the architecture supports it, GDB will use displaced | |
711 | stepping to step over breakpoints. If OFF, or if the architecture | |
712 | doesn't support it, GDB will instead use the traditional | |
713 | hold-and-step approach. If AUTO (which is the default), GDB will | |
714 | decide which technique to use to step over breakpoints depending on | |
715 | which of all-stop or non-stop mode is active --- displaced stepping | |
716 | in non-stop mode; hold-and-step in all-stop mode. */ | |
717 | ||
718 | static const char *can_use_displaced_stepping = | |
719 | can_use_displaced_stepping_auto; | |
720 | ||
237fc4c9 PA |
721 | static void |
722 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
723 | struct cmd_list_element *c, | |
724 | const char *value) | |
725 | { | |
fff08868 HZ |
726 | if (can_use_displaced_stepping == can_use_displaced_stepping_auto) |
727 | fprintf_filtered (file, _("\ | |
728 | Debugger's willingness to use displaced stepping to step over \ | |
729 | breakpoints is %s (currently %s).\n"), | |
730 | value, non_stop ? "on" : "off"); | |
731 | else | |
732 | fprintf_filtered (file, _("\ | |
733 | Debugger's willingness to use displaced stepping to step over \ | |
734 | breakpoints is %s.\n"), value); | |
237fc4c9 PA |
735 | } |
736 | ||
fff08868 HZ |
737 | /* Return non-zero if displaced stepping can/should be used to step |
738 | over breakpoints. */ | |
739 | ||
237fc4c9 PA |
740 | static int |
741 | use_displaced_stepping (struct gdbarch *gdbarch) | |
742 | { | |
fff08868 HZ |
743 | return (((can_use_displaced_stepping == can_use_displaced_stepping_auto |
744 | && non_stop) | |
745 | || can_use_displaced_stepping == can_use_displaced_stepping_on) | |
96429cc8 HZ |
746 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
747 | && !RECORD_IS_USED); | |
237fc4c9 PA |
748 | } |
749 | ||
750 | /* Clean out any stray displaced stepping state. */ | |
751 | static void | |
752 | displaced_step_clear (void) | |
753 | { | |
754 | /* Indicate that there is no cleanup pending. */ | |
755 | displaced_step_ptid = null_ptid; | |
756 | ||
757 | if (displaced_step_closure) | |
758 | { | |
759 | gdbarch_displaced_step_free_closure (displaced_step_gdbarch, | |
760 | displaced_step_closure); | |
761 | displaced_step_closure = NULL; | |
762 | } | |
763 | } | |
764 | ||
765 | static void | |
766 | cleanup_displaced_step_closure (void *ptr) | |
767 | { | |
768 | struct displaced_step_closure *closure = ptr; | |
769 | ||
770 | gdbarch_displaced_step_free_closure (current_gdbarch, closure); | |
771 | } | |
772 | ||
773 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
774 | void | |
775 | displaced_step_dump_bytes (struct ui_file *file, | |
776 | const gdb_byte *buf, | |
777 | size_t len) | |
778 | { | |
779 | int i; | |
780 | ||
781 | for (i = 0; i < len; i++) | |
782 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
783 | fputs_unfiltered ("\n", file); | |
784 | } | |
785 | ||
786 | /* Prepare to single-step, using displaced stepping. | |
787 | ||
788 | Note that we cannot use displaced stepping when we have a signal to | |
789 | deliver. If we have a signal to deliver and an instruction to step | |
790 | over, then after the step, there will be no indication from the | |
791 | target whether the thread entered a signal handler or ignored the | |
792 | signal and stepped over the instruction successfully --- both cases | |
793 | result in a simple SIGTRAP. In the first case we mustn't do a | |
794 | fixup, and in the second case we must --- but we can't tell which. | |
795 | Comments in the code for 'random signals' in handle_inferior_event | |
796 | explain how we handle this case instead. | |
797 | ||
798 | Returns 1 if preparing was successful -- this thread is going to be | |
799 | stepped now; or 0 if displaced stepping this thread got queued. */ | |
800 | static int | |
801 | displaced_step_prepare (ptid_t ptid) | |
802 | { | |
ad53cd71 | 803 | struct cleanup *old_cleanups, *ignore_cleanups; |
237fc4c9 PA |
804 | struct regcache *regcache = get_thread_regcache (ptid); |
805 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
806 | CORE_ADDR original, copy; | |
807 | ULONGEST len; | |
808 | struct displaced_step_closure *closure; | |
809 | ||
810 | /* We should never reach this function if the architecture does not | |
811 | support displaced stepping. */ | |
812 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
813 | ||
814 | /* For the first cut, we're displaced stepping one thread at a | |
815 | time. */ | |
816 | ||
817 | if (!ptid_equal (displaced_step_ptid, null_ptid)) | |
818 | { | |
819 | /* Already waiting for a displaced step to finish. Defer this | |
820 | request and place in queue. */ | |
821 | struct displaced_step_request *req, *new_req; | |
822 | ||
823 | if (debug_displaced) | |
824 | fprintf_unfiltered (gdb_stdlog, | |
825 | "displaced: defering step of %s\n", | |
826 | target_pid_to_str (ptid)); | |
827 | ||
828 | new_req = xmalloc (sizeof (*new_req)); | |
829 | new_req->ptid = ptid; | |
830 | new_req->next = NULL; | |
831 | ||
832 | if (displaced_step_request_queue) | |
833 | { | |
834 | for (req = displaced_step_request_queue; | |
835 | req && req->next; | |
836 | req = req->next) | |
837 | ; | |
838 | req->next = new_req; | |
839 | } | |
840 | else | |
841 | displaced_step_request_queue = new_req; | |
842 | ||
843 | return 0; | |
844 | } | |
845 | else | |
846 | { | |
847 | if (debug_displaced) | |
848 | fprintf_unfiltered (gdb_stdlog, | |
849 | "displaced: stepping %s now\n", | |
850 | target_pid_to_str (ptid)); | |
851 | } | |
852 | ||
853 | displaced_step_clear (); | |
854 | ||
ad53cd71 PA |
855 | old_cleanups = save_inferior_ptid (); |
856 | inferior_ptid = ptid; | |
857 | ||
515630c5 | 858 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
859 | |
860 | copy = gdbarch_displaced_step_location (gdbarch); | |
861 | len = gdbarch_max_insn_length (gdbarch); | |
862 | ||
863 | /* Save the original contents of the copy area. */ | |
864 | displaced_step_saved_copy = xmalloc (len); | |
ad53cd71 PA |
865 | ignore_cleanups = make_cleanup (free_current_contents, |
866 | &displaced_step_saved_copy); | |
237fc4c9 PA |
867 | read_memory (copy, displaced_step_saved_copy, len); |
868 | if (debug_displaced) | |
869 | { | |
870 | fprintf_unfiltered (gdb_stdlog, "displaced: saved 0x%s: ", | |
871 | paddr_nz (copy)); | |
872 | displaced_step_dump_bytes (gdb_stdlog, displaced_step_saved_copy, len); | |
873 | }; | |
874 | ||
875 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 876 | original, copy, regcache); |
237fc4c9 PA |
877 | |
878 | /* We don't support the fully-simulated case at present. */ | |
879 | gdb_assert (closure); | |
880 | ||
881 | make_cleanup (cleanup_displaced_step_closure, closure); | |
882 | ||
883 | /* Resume execution at the copy. */ | |
515630c5 | 884 | regcache_write_pc (regcache, copy); |
237fc4c9 | 885 | |
ad53cd71 PA |
886 | discard_cleanups (ignore_cleanups); |
887 | ||
888 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
889 | |
890 | if (debug_displaced) | |
891 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to 0x%s\n", | |
ad53cd71 | 892 | paddr_nz (copy)); |
237fc4c9 PA |
893 | |
894 | /* Save the information we need to fix things up if the step | |
895 | succeeds. */ | |
896 | displaced_step_ptid = ptid; | |
897 | displaced_step_gdbarch = gdbarch; | |
898 | displaced_step_closure = closure; | |
899 | displaced_step_original = original; | |
900 | displaced_step_copy = copy; | |
901 | return 1; | |
902 | } | |
903 | ||
904 | static void | |
905 | displaced_step_clear_cleanup (void *ignore) | |
906 | { | |
907 | displaced_step_clear (); | |
908 | } | |
909 | ||
910 | static void | |
911 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, const gdb_byte *myaddr, int len) | |
912 | { | |
913 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
914 | inferior_ptid = ptid; | |
915 | write_memory (memaddr, myaddr, len); | |
916 | do_cleanups (ptid_cleanup); | |
917 | } | |
918 | ||
919 | static void | |
920 | displaced_step_fixup (ptid_t event_ptid, enum target_signal signal) | |
921 | { | |
922 | struct cleanup *old_cleanups; | |
923 | ||
924 | /* Was this event for the pid we displaced? */ | |
925 | if (ptid_equal (displaced_step_ptid, null_ptid) | |
926 | || ! ptid_equal (displaced_step_ptid, event_ptid)) | |
927 | return; | |
928 | ||
929 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, 0); | |
930 | ||
931 | /* Restore the contents of the copy area. */ | |
932 | { | |
933 | ULONGEST len = gdbarch_max_insn_length (displaced_step_gdbarch); | |
934 | write_memory_ptid (displaced_step_ptid, displaced_step_copy, | |
935 | displaced_step_saved_copy, len); | |
936 | if (debug_displaced) | |
937 | fprintf_unfiltered (gdb_stdlog, "displaced: restored 0x%s\n", | |
938 | paddr_nz (displaced_step_copy)); | |
939 | } | |
940 | ||
941 | /* Did the instruction complete successfully? */ | |
942 | if (signal == TARGET_SIGNAL_TRAP) | |
943 | { | |
944 | /* Fix up the resulting state. */ | |
945 | gdbarch_displaced_step_fixup (displaced_step_gdbarch, | |
946 | displaced_step_closure, | |
947 | displaced_step_original, | |
948 | displaced_step_copy, | |
949 | get_thread_regcache (displaced_step_ptid)); | |
950 | } | |
951 | else | |
952 | { | |
953 | /* Since the instruction didn't complete, all we can do is | |
954 | relocate the PC. */ | |
515630c5 UW |
955 | struct regcache *regcache = get_thread_regcache (event_ptid); |
956 | CORE_ADDR pc = regcache_read_pc (regcache); | |
237fc4c9 | 957 | pc = displaced_step_original + (pc - displaced_step_copy); |
515630c5 | 958 | regcache_write_pc (regcache, pc); |
237fc4c9 PA |
959 | } |
960 | ||
961 | do_cleanups (old_cleanups); | |
962 | ||
1c5cfe86 PA |
963 | displaced_step_ptid = null_ptid; |
964 | ||
237fc4c9 PA |
965 | /* Are there any pending displaced stepping requests? If so, run |
966 | one now. */ | |
1c5cfe86 | 967 | while (displaced_step_request_queue) |
237fc4c9 PA |
968 | { |
969 | struct displaced_step_request *head; | |
970 | ptid_t ptid; | |
1c5cfe86 | 971 | CORE_ADDR actual_pc; |
237fc4c9 PA |
972 | |
973 | head = displaced_step_request_queue; | |
974 | ptid = head->ptid; | |
975 | displaced_step_request_queue = head->next; | |
976 | xfree (head); | |
977 | ||
ad53cd71 PA |
978 | context_switch (ptid); |
979 | ||
fb14de7b | 980 | actual_pc = regcache_read_pc (get_thread_regcache (ptid)); |
1c5cfe86 PA |
981 | |
982 | if (breakpoint_here_p (actual_pc)) | |
ad53cd71 | 983 | { |
1c5cfe86 PA |
984 | if (debug_displaced) |
985 | fprintf_unfiltered (gdb_stdlog, | |
986 | "displaced: stepping queued %s now\n", | |
987 | target_pid_to_str (ptid)); | |
988 | ||
989 | displaced_step_prepare (ptid); | |
990 | ||
991 | if (debug_displaced) | |
992 | { | |
993 | gdb_byte buf[4]; | |
994 | ||
995 | fprintf_unfiltered (gdb_stdlog, "displaced: run 0x%s: ", | |
996 | paddr_nz (actual_pc)); | |
997 | read_memory (actual_pc, buf, sizeof (buf)); | |
998 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
999 | } | |
1000 | ||
1001 | target_resume (ptid, 1, TARGET_SIGNAL_0); | |
1002 | ||
1003 | /* Done, we're stepping a thread. */ | |
1004 | break; | |
ad53cd71 | 1005 | } |
1c5cfe86 PA |
1006 | else |
1007 | { | |
1008 | int step; | |
1009 | struct thread_info *tp = inferior_thread (); | |
1010 | ||
1011 | /* The breakpoint we were sitting under has since been | |
1012 | removed. */ | |
1013 | tp->trap_expected = 0; | |
1014 | ||
1015 | /* Go back to what we were trying to do. */ | |
1016 | step = currently_stepping (tp); | |
ad53cd71 | 1017 | |
1c5cfe86 PA |
1018 | if (debug_displaced) |
1019 | fprintf_unfiltered (gdb_stdlog, "breakpoint is gone %s: step(%d)\n", | |
1020 | target_pid_to_str (tp->ptid), step); | |
1021 | ||
1022 | target_resume (ptid, step, TARGET_SIGNAL_0); | |
1023 | tp->stop_signal = TARGET_SIGNAL_0; | |
1024 | ||
1025 | /* This request was discarded. See if there's any other | |
1026 | thread waiting for its turn. */ | |
1027 | } | |
237fc4c9 PA |
1028 | } |
1029 | } | |
1030 | ||
5231c1fd PA |
1031 | /* Update global variables holding ptids to hold NEW_PTID if they were |
1032 | holding OLD_PTID. */ | |
1033 | static void | |
1034 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
1035 | { | |
1036 | struct displaced_step_request *it; | |
1037 | ||
1038 | if (ptid_equal (inferior_ptid, old_ptid)) | |
1039 | inferior_ptid = new_ptid; | |
1040 | ||
1041 | if (ptid_equal (singlestep_ptid, old_ptid)) | |
1042 | singlestep_ptid = new_ptid; | |
1043 | ||
1044 | if (ptid_equal (displaced_step_ptid, old_ptid)) | |
1045 | displaced_step_ptid = new_ptid; | |
1046 | ||
1047 | if (ptid_equal (deferred_step_ptid, old_ptid)) | |
1048 | deferred_step_ptid = new_ptid; | |
1049 | ||
1050 | for (it = displaced_step_request_queue; it; it = it->next) | |
1051 | if (ptid_equal (it->ptid, old_ptid)) | |
1052 | it->ptid = new_ptid; | |
1053 | } | |
1054 | ||
237fc4c9 PA |
1055 | \f |
1056 | /* Resuming. */ | |
c906108c SS |
1057 | |
1058 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 1059 | static void |
74b7792f | 1060 | resume_cleanups (void *ignore) |
c906108c SS |
1061 | { |
1062 | normal_stop (); | |
1063 | } | |
1064 | ||
53904c9e AC |
1065 | static const char schedlock_off[] = "off"; |
1066 | static const char schedlock_on[] = "on"; | |
1067 | static const char schedlock_step[] = "step"; | |
488f131b | 1068 | static const char *scheduler_enums[] = { |
ef346e04 AC |
1069 | schedlock_off, |
1070 | schedlock_on, | |
1071 | schedlock_step, | |
1072 | NULL | |
1073 | }; | |
920d2a44 AC |
1074 | static const char *scheduler_mode = schedlock_off; |
1075 | static void | |
1076 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
1077 | struct cmd_list_element *c, const char *value) | |
1078 | { | |
1079 | fprintf_filtered (file, _("\ | |
1080 | Mode for locking scheduler during execution is \"%s\".\n"), | |
1081 | value); | |
1082 | } | |
c906108c SS |
1083 | |
1084 | static void | |
96baa820 | 1085 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 1086 | { |
eefe576e AC |
1087 | if (!target_can_lock_scheduler) |
1088 | { | |
1089 | scheduler_mode = schedlock_off; | |
1090 | error (_("Target '%s' cannot support this command."), target_shortname); | |
1091 | } | |
c906108c SS |
1092 | } |
1093 | ||
d4db2f36 PA |
1094 | /* True if execution commands resume all threads of all processes by |
1095 | default; otherwise, resume only threads of the current inferior | |
1096 | process. */ | |
1097 | int sched_multi = 0; | |
1098 | ||
2facfe5c DD |
1099 | /* Try to setup for software single stepping over the specified location. |
1100 | Return 1 if target_resume() should use hardware single step. | |
1101 | ||
1102 | GDBARCH the current gdbarch. | |
1103 | PC the location to step over. */ | |
1104 | ||
1105 | static int | |
1106 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1107 | { | |
1108 | int hw_step = 1; | |
1109 | ||
1110 | if (gdbarch_software_single_step_p (gdbarch) | |
1111 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) | |
1112 | { | |
1113 | hw_step = 0; | |
1114 | /* Do not pull these breakpoints until after a `wait' in | |
1115 | `wait_for_inferior' */ | |
1116 | singlestep_breakpoints_inserted_p = 1; | |
1117 | singlestep_ptid = inferior_ptid; | |
1118 | singlestep_pc = pc; | |
1119 | } | |
1120 | return hw_step; | |
1121 | } | |
c906108c SS |
1122 | |
1123 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
1124 | wants to interrupt some lengthy single-stepping operation | |
1125 | (for child processes, the SIGINT goes to the inferior, and so | |
1126 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
1127 | other targets, that's not true). | |
1128 | ||
1129 | STEP nonzero if we should step (zero to continue instead). | |
1130 | SIG is the signal to give the inferior (zero for none). */ | |
1131 | void | |
96baa820 | 1132 | resume (int step, enum target_signal sig) |
c906108c SS |
1133 | { |
1134 | int should_resume = 1; | |
74b7792f | 1135 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
1136 | struct regcache *regcache = get_current_regcache (); |
1137 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 1138 | struct thread_info *tp = inferior_thread (); |
515630c5 | 1139 | CORE_ADDR pc = regcache_read_pc (regcache); |
c7e8a53c | 1140 | |
c906108c SS |
1141 | QUIT; |
1142 | ||
527159b7 | 1143 | if (debug_infrun) |
237fc4c9 PA |
1144 | fprintf_unfiltered (gdb_stdlog, |
1145 | "infrun: resume (step=%d, signal=%d), " | |
4e1c45ea PA |
1146 | "trap_expected=%d\n", |
1147 | step, sig, tp->trap_expected); | |
c906108c | 1148 | |
692590c1 MS |
1149 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
1150 | over an instruction that causes a page fault without triggering | |
1151 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
1152 | stop, because the hardware watchpoint is not triggered, but it forgets | |
1153 | the step request and continues the program normally. | |
1154 | Work around the problem by removing hardware watchpoints if a step is | |
1155 | requested, GDB will check for a hardware watchpoint trigger after the | |
1156 | step anyway. */ | |
c36b740a | 1157 | if (CANNOT_STEP_HW_WATCHPOINTS && step) |
692590c1 | 1158 | remove_hw_watchpoints (); |
488f131b | 1159 | |
692590c1 | 1160 | |
c2c6d25f JM |
1161 | /* Normally, by the time we reach `resume', the breakpoints are either |
1162 | removed or inserted, as appropriate. The exception is if we're sitting | |
1163 | at a permanent breakpoint; we need to step over it, but permanent | |
1164 | breakpoints can't be removed. So we have to test for it here. */ | |
237fc4c9 | 1165 | if (breakpoint_here_p (pc) == permanent_breakpoint_here) |
6d350bb5 | 1166 | { |
515630c5 UW |
1167 | if (gdbarch_skip_permanent_breakpoint_p (gdbarch)) |
1168 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
6d350bb5 UW |
1169 | else |
1170 | error (_("\ | |
1171 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
1172 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
1173 | a command like `return' or `jump' to continue execution.")); | |
1174 | } | |
c2c6d25f | 1175 | |
237fc4c9 PA |
1176 | /* If enabled, step over breakpoints by executing a copy of the |
1177 | instruction at a different address. | |
1178 | ||
1179 | We can't use displaced stepping when we have a signal to deliver; | |
1180 | the comments for displaced_step_prepare explain why. The | |
1181 | comments in the handle_inferior event for dealing with 'random | |
1182 | signals' explain what we do instead. */ | |
515630c5 | 1183 | if (use_displaced_stepping (gdbarch) |
4e1c45ea | 1184 | && tp->trap_expected |
237fc4c9 PA |
1185 | && sig == TARGET_SIGNAL_0) |
1186 | { | |
1187 | if (!displaced_step_prepare (inferior_ptid)) | |
d56b7306 VP |
1188 | { |
1189 | /* Got placed in displaced stepping queue. Will be resumed | |
1190 | later when all the currently queued displaced stepping | |
7f7efbd9 VP |
1191 | requests finish. The thread is not executing at this point, |
1192 | and the call to set_executing will be made later. But we | |
1193 | need to call set_running here, since from frontend point of view, | |
1194 | the thread is running. */ | |
1195 | set_running (inferior_ptid, 1); | |
d56b7306 VP |
1196 | discard_cleanups (old_cleanups); |
1197 | return; | |
1198 | } | |
237fc4c9 PA |
1199 | } |
1200 | ||
2facfe5c DD |
1201 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
1202 | if (step) | |
1203 | step = maybe_software_singlestep (gdbarch, pc); | |
c906108c | 1204 | |
c906108c SS |
1205 | if (should_resume) |
1206 | { | |
39f77062 | 1207 | ptid_t resume_ptid; |
dfcd3bfb | 1208 | |
cd76b0b7 VP |
1209 | /* If STEP is set, it's a request to use hardware stepping |
1210 | facilities. But in that case, we should never | |
1211 | use singlestep breakpoint. */ | |
1212 | gdb_assert (!(singlestep_breakpoints_inserted_p && step)); | |
1213 | ||
d4db2f36 PA |
1214 | /* Decide the set of threads to ask the target to resume. Start |
1215 | by assuming everything will be resumed, than narrow the set | |
1216 | by applying increasingly restricting conditions. */ | |
1217 | ||
1218 | /* By default, resume all threads of all processes. */ | |
1219 | resume_ptid = RESUME_ALL; | |
1220 | ||
1221 | /* Maybe resume only all threads of the current process. */ | |
1222 | if (!sched_multi && target_supports_multi_process ()) | |
1223 | { | |
1224 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
1225 | } | |
1226 | ||
1227 | /* Maybe resume a single thread after all. */ | |
cd76b0b7 VP |
1228 | if (singlestep_breakpoints_inserted_p |
1229 | && stepping_past_singlestep_breakpoint) | |
c906108c | 1230 | { |
cd76b0b7 VP |
1231 | /* The situation here is as follows. In thread T1 we wanted to |
1232 | single-step. Lacking hardware single-stepping we've | |
1233 | set breakpoint at the PC of the next instruction -- call it | |
1234 | P. After resuming, we've hit that breakpoint in thread T2. | |
1235 | Now we've removed original breakpoint, inserted breakpoint | |
1236 | at P+1, and try to step to advance T2 past breakpoint. | |
1237 | We need to step only T2, as if T1 is allowed to freely run, | |
1238 | it can run past P, and if other threads are allowed to run, | |
1239 | they can hit breakpoint at P+1, and nested hits of single-step | |
1240 | breakpoints is not something we'd want -- that's complicated | |
1241 | to support, and has no value. */ | |
1242 | resume_ptid = inferior_ptid; | |
1243 | } | |
d4db2f36 PA |
1244 | else if ((step || singlestep_breakpoints_inserted_p) |
1245 | && tp->trap_expected) | |
cd76b0b7 | 1246 | { |
74960c60 VP |
1247 | /* We're allowing a thread to run past a breakpoint it has |
1248 | hit, by single-stepping the thread with the breakpoint | |
1249 | removed. In which case, we need to single-step only this | |
1250 | thread, and keep others stopped, as they can miss this | |
1251 | breakpoint if allowed to run. | |
1252 | ||
1253 | The current code actually removes all breakpoints when | |
1254 | doing this, not just the one being stepped over, so if we | |
1255 | let other threads run, we can actually miss any | |
1256 | breakpoint, not just the one at PC. */ | |
ef5cf84e | 1257 | resume_ptid = inferior_ptid; |
c906108c | 1258 | } |
d4db2f36 | 1259 | else if (non_stop) |
94cc34af PA |
1260 | { |
1261 | /* With non-stop mode on, threads are always handled | |
1262 | individually. */ | |
1263 | resume_ptid = inferior_ptid; | |
1264 | } | |
1265 | else if ((scheduler_mode == schedlock_on) | |
1266 | || (scheduler_mode == schedlock_step | |
1267 | && (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 1268 | { |
ef5cf84e | 1269 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 1270 | resume_ptid = inferior_ptid; |
c906108c | 1271 | } |
ef5cf84e | 1272 | |
515630c5 | 1273 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4ed33b9 AC |
1274 | { |
1275 | /* Most targets can step a breakpoint instruction, thus | |
1276 | executing it normally. But if this one cannot, just | |
1277 | continue and we will hit it anyway. */ | |
237fc4c9 | 1278 | if (step && breakpoint_inserted_here_p (pc)) |
c4ed33b9 AC |
1279 | step = 0; |
1280 | } | |
237fc4c9 PA |
1281 | |
1282 | if (debug_displaced | |
515630c5 | 1283 | && use_displaced_stepping (gdbarch) |
4e1c45ea | 1284 | && tp->trap_expected) |
237fc4c9 | 1285 | { |
515630c5 UW |
1286 | struct regcache *resume_regcache = get_thread_regcache (resume_ptid); |
1287 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); | |
237fc4c9 PA |
1288 | gdb_byte buf[4]; |
1289 | ||
1290 | fprintf_unfiltered (gdb_stdlog, "displaced: run 0x%s: ", | |
1291 | paddr_nz (actual_pc)); | |
1292 | read_memory (actual_pc, buf, sizeof (buf)); | |
1293 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1294 | } | |
1295 | ||
e58b0e63 PA |
1296 | /* Install inferior's terminal modes. */ |
1297 | target_terminal_inferior (); | |
1298 | ||
2020b7ab PA |
1299 | /* Avoid confusing the next resume, if the next stop/resume |
1300 | happens to apply to another thread. */ | |
1301 | tp->stop_signal = TARGET_SIGNAL_0; | |
607cecd2 PA |
1302 | |
1303 | target_resume (resume_ptid, step, sig); | |
c906108c SS |
1304 | } |
1305 | ||
1306 | discard_cleanups (old_cleanups); | |
1307 | } | |
1308 | \f | |
237fc4c9 | 1309 | /* Proceeding. */ |
c906108c SS |
1310 | |
1311 | /* Clear out all variables saying what to do when inferior is continued. | |
1312 | First do this, then set the ones you want, then call `proceed'. */ | |
1313 | ||
a7212384 UW |
1314 | static void |
1315 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 1316 | { |
a7212384 UW |
1317 | if (debug_infrun) |
1318 | fprintf_unfiltered (gdb_stdlog, | |
1319 | "infrun: clear_proceed_status_thread (%s)\n", | |
1320 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 1321 | |
a7212384 UW |
1322 | tp->trap_expected = 0; |
1323 | tp->step_range_start = 0; | |
1324 | tp->step_range_end = 0; | |
1325 | tp->step_frame_id = null_frame_id; | |
1326 | tp->step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
1327 | tp->stop_requested = 0; | |
4e1c45ea | 1328 | |
a7212384 | 1329 | tp->stop_step = 0; |
32400beb | 1330 | |
a7212384 | 1331 | tp->proceed_to_finish = 0; |
414c69f7 | 1332 | |
a7212384 UW |
1333 | /* Discard any remaining commands or status from previous stop. */ |
1334 | bpstat_clear (&tp->stop_bpstat); | |
1335 | } | |
32400beb | 1336 | |
a7212384 UW |
1337 | static int |
1338 | clear_proceed_status_callback (struct thread_info *tp, void *data) | |
1339 | { | |
1340 | if (is_exited (tp->ptid)) | |
1341 | return 0; | |
d6b48e9c | 1342 | |
a7212384 UW |
1343 | clear_proceed_status_thread (tp); |
1344 | return 0; | |
1345 | } | |
1346 | ||
1347 | void | |
1348 | clear_proceed_status (void) | |
1349 | { | |
1350 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
1351 | { | |
1352 | struct inferior *inferior; | |
1353 | ||
1354 | if (non_stop) | |
1355 | { | |
1356 | /* If in non-stop mode, only delete the per-thread status | |
1357 | of the current thread. */ | |
1358 | clear_proceed_status_thread (inferior_thread ()); | |
1359 | } | |
1360 | else | |
1361 | { | |
1362 | /* In all-stop mode, delete the per-thread status of | |
1363 | *all* threads. */ | |
1364 | iterate_over_threads (clear_proceed_status_callback, NULL); | |
1365 | } | |
1366 | ||
d6b48e9c PA |
1367 | inferior = current_inferior (); |
1368 | inferior->stop_soon = NO_STOP_QUIETLY; | |
4e1c45ea PA |
1369 | } |
1370 | ||
c906108c | 1371 | stop_after_trap = 0; |
f3b1572e PA |
1372 | |
1373 | observer_notify_about_to_proceed (); | |
c906108c | 1374 | |
d5c31457 UW |
1375 | if (stop_registers) |
1376 | { | |
1377 | regcache_xfree (stop_registers); | |
1378 | stop_registers = NULL; | |
1379 | } | |
c906108c SS |
1380 | } |
1381 | ||
5a437975 DE |
1382 | /* Check the current thread against the thread that reported the most recent |
1383 | event. If a step-over is required return TRUE and set the current thread | |
1384 | to the old thread. Otherwise return FALSE. | |
1385 | ||
1386 | This should be suitable for any targets that support threads. */ | |
ea67f13b DJ |
1387 | |
1388 | static int | |
6a6b96b9 | 1389 | prepare_to_proceed (int step) |
ea67f13b DJ |
1390 | { |
1391 | ptid_t wait_ptid; | |
1392 | struct target_waitstatus wait_status; | |
5a437975 DE |
1393 | int schedlock_enabled; |
1394 | ||
1395 | /* With non-stop mode on, threads are always handled individually. */ | |
1396 | gdb_assert (! non_stop); | |
ea67f13b DJ |
1397 | |
1398 | /* Get the last target status returned by target_wait(). */ | |
1399 | get_last_target_status (&wait_ptid, &wait_status); | |
1400 | ||
6a6b96b9 | 1401 | /* Make sure we were stopped at a breakpoint. */ |
ea67f13b | 1402 | if (wait_status.kind != TARGET_WAITKIND_STOPPED |
6a6b96b9 | 1403 | || wait_status.value.sig != TARGET_SIGNAL_TRAP) |
ea67f13b DJ |
1404 | { |
1405 | return 0; | |
1406 | } | |
1407 | ||
5a437975 DE |
1408 | schedlock_enabled = (scheduler_mode == schedlock_on |
1409 | || (scheduler_mode == schedlock_step | |
1410 | && step)); | |
1411 | ||
d4db2f36 PA |
1412 | /* Don't switch over to WAIT_PTID if scheduler locking is on. */ |
1413 | if (schedlock_enabled) | |
1414 | return 0; | |
1415 | ||
1416 | /* Don't switch over if we're about to resume some other process | |
1417 | other than WAIT_PTID's, and schedule-multiple is off. */ | |
1418 | if (!sched_multi | |
1419 | && ptid_get_pid (wait_ptid) != ptid_get_pid (inferior_ptid)) | |
1420 | return 0; | |
1421 | ||
6a6b96b9 | 1422 | /* Switched over from WAIT_PID. */ |
ea67f13b | 1423 | if (!ptid_equal (wait_ptid, minus_one_ptid) |
d4db2f36 | 1424 | && !ptid_equal (inferior_ptid, wait_ptid)) |
ea67f13b | 1425 | { |
515630c5 UW |
1426 | struct regcache *regcache = get_thread_regcache (wait_ptid); |
1427 | ||
1428 | if (breakpoint_here_p (regcache_read_pc (regcache))) | |
ea67f13b | 1429 | { |
515630c5 UW |
1430 | /* If stepping, remember current thread to switch back to. */ |
1431 | if (step) | |
1432 | deferred_step_ptid = inferior_ptid; | |
ea67f13b | 1433 | |
515630c5 UW |
1434 | /* Switch back to WAIT_PID thread. */ |
1435 | switch_to_thread (wait_ptid); | |
6a6b96b9 | 1436 | |
515630c5 UW |
1437 | /* We return 1 to indicate that there is a breakpoint here, |
1438 | so we need to step over it before continuing to avoid | |
1439 | hitting it straight away. */ | |
1440 | return 1; | |
1441 | } | |
ea67f13b DJ |
1442 | } |
1443 | ||
1444 | return 0; | |
ea67f13b | 1445 | } |
e4846b08 | 1446 | |
c906108c SS |
1447 | /* Basic routine for continuing the program in various fashions. |
1448 | ||
1449 | ADDR is the address to resume at, or -1 for resume where stopped. | |
1450 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 1451 | or -1 for act according to how it stopped. |
c906108c | 1452 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
1453 | -1 means return after that and print nothing. |
1454 | You should probably set various step_... variables | |
1455 | before calling here, if you are stepping. | |
c906108c SS |
1456 | |
1457 | You should call clear_proceed_status before calling proceed. */ | |
1458 | ||
1459 | void | |
96baa820 | 1460 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c | 1461 | { |
e58b0e63 PA |
1462 | struct regcache *regcache; |
1463 | struct gdbarch *gdbarch; | |
4e1c45ea | 1464 | struct thread_info *tp; |
e58b0e63 | 1465 | CORE_ADDR pc; |
c906108c SS |
1466 | int oneproc = 0; |
1467 | ||
e58b0e63 PA |
1468 | /* If we're stopped at a fork/vfork, follow the branch set by the |
1469 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
1470 | resuming the current thread. */ | |
1471 | if (!follow_fork ()) | |
1472 | { | |
1473 | /* The target for some reason decided not to resume. */ | |
1474 | normal_stop (); | |
1475 | return; | |
1476 | } | |
1477 | ||
1478 | regcache = get_current_regcache (); | |
1479 | gdbarch = get_regcache_arch (regcache); | |
1480 | pc = regcache_read_pc (regcache); | |
1481 | ||
c906108c | 1482 | if (step > 0) |
515630c5 | 1483 | step_start_function = find_pc_function (pc); |
c906108c SS |
1484 | if (step < 0) |
1485 | stop_after_trap = 1; | |
1486 | ||
2acceee2 | 1487 | if (addr == (CORE_ADDR) -1) |
c906108c | 1488 | { |
b2175913 MS |
1489 | if (pc == stop_pc && breakpoint_here_p (pc) |
1490 | && execution_direction != EXEC_REVERSE) | |
3352ef37 AC |
1491 | /* There is a breakpoint at the address we will resume at, |
1492 | step one instruction before inserting breakpoints so that | |
1493 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
1494 | breakpoint). |
1495 | ||
1496 | Note, we don't do this in reverse, because we won't | |
1497 | actually be executing the breakpoint insn anyway. | |
1498 | We'll be (un-)executing the previous instruction. */ | |
1499 | ||
c906108c | 1500 | oneproc = 1; |
515630c5 UW |
1501 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
1502 | && gdbarch_single_step_through_delay (gdbarch, | |
1503 | get_current_frame ())) | |
3352ef37 AC |
1504 | /* We stepped onto an instruction that needs to be stepped |
1505 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
1506 | oneproc = 1; |
1507 | } | |
1508 | else | |
1509 | { | |
515630c5 | 1510 | regcache_write_pc (regcache, addr); |
c906108c SS |
1511 | } |
1512 | ||
527159b7 | 1513 | if (debug_infrun) |
8a9de0e4 AC |
1514 | fprintf_unfiltered (gdb_stdlog, |
1515 | "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", | |
1516 | paddr_nz (addr), siggnal, step); | |
527159b7 | 1517 | |
94cc34af PA |
1518 | if (non_stop) |
1519 | /* In non-stop, each thread is handled individually. The context | |
1520 | must already be set to the right thread here. */ | |
1521 | ; | |
1522 | else | |
1523 | { | |
1524 | /* In a multi-threaded task we may select another thread and | |
1525 | then continue or step. | |
c906108c | 1526 | |
94cc34af PA |
1527 | But if the old thread was stopped at a breakpoint, it will |
1528 | immediately cause another breakpoint stop without any | |
1529 | execution (i.e. it will report a breakpoint hit incorrectly). | |
1530 | So we must step over it first. | |
c906108c | 1531 | |
94cc34af PA |
1532 | prepare_to_proceed checks the current thread against the |
1533 | thread that reported the most recent event. If a step-over | |
1534 | is required it returns TRUE and sets the current thread to | |
1535 | the old thread. */ | |
1536 | if (prepare_to_proceed (step)) | |
1537 | oneproc = 1; | |
1538 | } | |
c906108c | 1539 | |
4e1c45ea PA |
1540 | /* prepare_to_proceed may change the current thread. */ |
1541 | tp = inferior_thread (); | |
1542 | ||
c906108c | 1543 | if (oneproc) |
74960c60 | 1544 | { |
4e1c45ea | 1545 | tp->trap_expected = 1; |
237fc4c9 PA |
1546 | /* If displaced stepping is enabled, we can step over the |
1547 | breakpoint without hitting it, so leave all breakpoints | |
1548 | inserted. Otherwise we need to disable all breakpoints, step | |
1549 | one instruction, and then re-add them when that step is | |
1550 | finished. */ | |
515630c5 | 1551 | if (!use_displaced_stepping (gdbarch)) |
237fc4c9 | 1552 | remove_breakpoints (); |
74960c60 | 1553 | } |
237fc4c9 PA |
1554 | |
1555 | /* We can insert breakpoints if we're not trying to step over one, | |
1556 | or if we are stepping over one but we're using displaced stepping | |
1557 | to do so. */ | |
4e1c45ea | 1558 | if (! tp->trap_expected || use_displaced_stepping (gdbarch)) |
c36b740a | 1559 | insert_breakpoints (); |
c906108c | 1560 | |
2020b7ab PA |
1561 | if (!non_stop) |
1562 | { | |
1563 | /* Pass the last stop signal to the thread we're resuming, | |
1564 | irrespective of whether the current thread is the thread that | |
1565 | got the last event or not. This was historically GDB's | |
1566 | behaviour before keeping a stop_signal per thread. */ | |
1567 | ||
1568 | struct thread_info *last_thread; | |
1569 | ptid_t last_ptid; | |
1570 | struct target_waitstatus last_status; | |
1571 | ||
1572 | get_last_target_status (&last_ptid, &last_status); | |
1573 | if (!ptid_equal (inferior_ptid, last_ptid) | |
1574 | && !ptid_equal (last_ptid, null_ptid) | |
1575 | && !ptid_equal (last_ptid, minus_one_ptid)) | |
1576 | { | |
e09875d4 | 1577 | last_thread = find_thread_ptid (last_ptid); |
2020b7ab PA |
1578 | if (last_thread) |
1579 | { | |
1580 | tp->stop_signal = last_thread->stop_signal; | |
1581 | last_thread->stop_signal = TARGET_SIGNAL_0; | |
1582 | } | |
1583 | } | |
1584 | } | |
1585 | ||
c906108c | 1586 | if (siggnal != TARGET_SIGNAL_DEFAULT) |
2020b7ab | 1587 | tp->stop_signal = siggnal; |
c906108c SS |
1588 | /* If this signal should not be seen by program, |
1589 | give it zero. Used for debugging signals. */ | |
2020b7ab PA |
1590 | else if (!signal_program[tp->stop_signal]) |
1591 | tp->stop_signal = TARGET_SIGNAL_0; | |
c906108c SS |
1592 | |
1593 | annotate_starting (); | |
1594 | ||
1595 | /* Make sure that output from GDB appears before output from the | |
1596 | inferior. */ | |
1597 | gdb_flush (gdb_stdout); | |
1598 | ||
e4846b08 JJ |
1599 | /* Refresh prev_pc value just prior to resuming. This used to be |
1600 | done in stop_stepping, however, setting prev_pc there did not handle | |
1601 | scenarios such as inferior function calls or returning from | |
1602 | a function via the return command. In those cases, the prev_pc | |
1603 | value was not set properly for subsequent commands. The prev_pc value | |
1604 | is used to initialize the starting line number in the ecs. With an | |
1605 | invalid value, the gdb next command ends up stopping at the position | |
1606 | represented by the next line table entry past our start position. | |
1607 | On platforms that generate one line table entry per line, this | |
1608 | is not a problem. However, on the ia64, the compiler generates | |
1609 | extraneous line table entries that do not increase the line number. | |
1610 | When we issue the gdb next command on the ia64 after an inferior call | |
1611 | or a return command, we often end up a few instructions forward, still | |
1612 | within the original line we started. | |
1613 | ||
1614 | An attempt was made to have init_execution_control_state () refresh | |
1615 | the prev_pc value before calculating the line number. This approach | |
1616 | did not work because on platforms that use ptrace, the pc register | |
1617 | cannot be read unless the inferior is stopped. At that point, we | |
515630c5 | 1618 | are not guaranteed the inferior is stopped and so the regcache_read_pc () |
e4846b08 | 1619 | call can fail. Setting the prev_pc value here ensures the value is |
8fb3e588 | 1620 | updated correctly when the inferior is stopped. */ |
4e1c45ea | 1621 | tp->prev_pc = regcache_read_pc (get_current_regcache ()); |
e4846b08 | 1622 | |
59f0d5d9 | 1623 | /* Fill in with reasonable starting values. */ |
4e1c45ea | 1624 | init_thread_stepping_state (tp); |
59f0d5d9 | 1625 | |
59f0d5d9 PA |
1626 | /* Reset to normal state. */ |
1627 | init_infwait_state (); | |
1628 | ||
c906108c | 1629 | /* Resume inferior. */ |
2020b7ab | 1630 | resume (oneproc || step || bpstat_should_step (), tp->stop_signal); |
c906108c SS |
1631 | |
1632 | /* Wait for it to stop (if not standalone) | |
1633 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
1634 | /* Do this only if we are not using the event loop, or if the target |
1635 | does not support asynchronous execution. */ | |
362646f5 | 1636 | if (!target_can_async_p ()) |
43ff13b4 | 1637 | { |
ae123ec6 | 1638 | wait_for_inferior (0); |
43ff13b4 JM |
1639 | normal_stop (); |
1640 | } | |
c906108c | 1641 | } |
c906108c SS |
1642 | \f |
1643 | ||
1644 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 1645 | |
c906108c | 1646 | void |
8621d6a9 | 1647 | start_remote (int from_tty) |
c906108c | 1648 | { |
d6b48e9c | 1649 | struct inferior *inferior; |
c906108c | 1650 | init_wait_for_inferior (); |
d6b48e9c PA |
1651 | |
1652 | inferior = current_inferior (); | |
1653 | inferior->stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 1654 | |
6426a772 JM |
1655 | /* Always go on waiting for the target, regardless of the mode. */ |
1656 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 1657 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
1658 | nothing is returned (instead of just blocking). Because of this, |
1659 | targets expecting an immediate response need to, internally, set | |
1660 | things up so that the target_wait() is forced to eventually | |
1661 | timeout. */ | |
1662 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
1663 | differentiate to its caller what the state of the target is after | |
1664 | the initial open has been performed. Here we're assuming that | |
1665 | the target has stopped. It should be possible to eventually have | |
1666 | target_open() return to the caller an indication that the target | |
1667 | is currently running and GDB state should be set to the same as | |
1668 | for an async run. */ | |
ae123ec6 | 1669 | wait_for_inferior (0); |
8621d6a9 DJ |
1670 | |
1671 | /* Now that the inferior has stopped, do any bookkeeping like | |
1672 | loading shared libraries. We want to do this before normal_stop, | |
1673 | so that the displayed frame is up to date. */ | |
1674 | post_create_inferior (¤t_target, from_tty); | |
1675 | ||
6426a772 | 1676 | normal_stop (); |
c906108c SS |
1677 | } |
1678 | ||
1679 | /* Initialize static vars when a new inferior begins. */ | |
1680 | ||
1681 | void | |
96baa820 | 1682 | init_wait_for_inferior (void) |
c906108c SS |
1683 | { |
1684 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 1685 | |
c906108c SS |
1686 | breakpoint_init_inferior (inf_starting); |
1687 | ||
c906108c | 1688 | clear_proceed_status (); |
9f976b41 DJ |
1689 | |
1690 | stepping_past_singlestep_breakpoint = 0; | |
ca67fcb8 | 1691 | deferred_step_ptid = null_ptid; |
ca005067 DJ |
1692 | |
1693 | target_last_wait_ptid = minus_one_ptid; | |
237fc4c9 | 1694 | |
0d1e5fa7 PA |
1695 | previous_inferior_ptid = null_ptid; |
1696 | init_infwait_state (); | |
1697 | ||
237fc4c9 | 1698 | displaced_step_clear (); |
c906108c | 1699 | } |
237fc4c9 | 1700 | |
c906108c | 1701 | \f |
b83266a0 SS |
1702 | /* This enum encodes possible reasons for doing a target_wait, so that |
1703 | wfi can call target_wait in one place. (Ultimately the call will be | |
1704 | moved out of the infinite loop entirely.) */ | |
1705 | ||
c5aa993b JM |
1706 | enum infwait_states |
1707 | { | |
cd0fc7c3 SS |
1708 | infwait_normal_state, |
1709 | infwait_thread_hop_state, | |
d983da9c | 1710 | infwait_step_watch_state, |
cd0fc7c3 | 1711 | infwait_nonstep_watch_state |
b83266a0 SS |
1712 | }; |
1713 | ||
11cf8741 JM |
1714 | /* Why did the inferior stop? Used to print the appropriate messages |
1715 | to the interface from within handle_inferior_event(). */ | |
1716 | enum inferior_stop_reason | |
1717 | { | |
11cf8741 JM |
1718 | /* Step, next, nexti, stepi finished. */ |
1719 | END_STEPPING_RANGE, | |
11cf8741 JM |
1720 | /* Inferior terminated by signal. */ |
1721 | SIGNAL_EXITED, | |
1722 | /* Inferior exited. */ | |
1723 | EXITED, | |
1724 | /* Inferior received signal, and user asked to be notified. */ | |
b2175913 MS |
1725 | SIGNAL_RECEIVED, |
1726 | /* Reverse execution -- target ran out of history info. */ | |
1727 | NO_HISTORY | |
11cf8741 JM |
1728 | }; |
1729 | ||
0d1e5fa7 PA |
1730 | /* The PTID we'll do a target_wait on.*/ |
1731 | ptid_t waiton_ptid; | |
1732 | ||
1733 | /* Current inferior wait state. */ | |
1734 | enum infwait_states infwait_state; | |
cd0fc7c3 | 1735 | |
0d1e5fa7 PA |
1736 | /* Data to be passed around while handling an event. This data is |
1737 | discarded between events. */ | |
c5aa993b | 1738 | struct execution_control_state |
488f131b | 1739 | { |
0d1e5fa7 | 1740 | ptid_t ptid; |
4e1c45ea PA |
1741 | /* The thread that got the event, if this was a thread event; NULL |
1742 | otherwise. */ | |
1743 | struct thread_info *event_thread; | |
1744 | ||
488f131b | 1745 | struct target_waitstatus ws; |
488f131b JB |
1746 | int random_signal; |
1747 | CORE_ADDR stop_func_start; | |
1748 | CORE_ADDR stop_func_end; | |
1749 | char *stop_func_name; | |
488f131b | 1750 | int new_thread_event; |
488f131b JB |
1751 | int wait_some_more; |
1752 | }; | |
1753 | ||
1754 | void init_execution_control_state (struct execution_control_state *ecs); | |
1755 | ||
1756 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 1757 | |
b2175913 MS |
1758 | static void handle_step_into_function (struct execution_control_state *ecs); |
1759 | static void handle_step_into_function_backward (struct execution_control_state *ecs); | |
44cbf7b5 | 1760 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
14e60db5 | 1761 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); |
44cbf7b5 AC |
1762 | static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, |
1763 | struct frame_id sr_id); | |
611c83ae PA |
1764 | static void insert_longjmp_resume_breakpoint (CORE_ADDR); |
1765 | ||
104c1213 JM |
1766 | static void stop_stepping (struct execution_control_state *ecs); |
1767 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 1768 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
1769 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
1770 | int stop_info); | |
104c1213 | 1771 | |
252fbfc8 PA |
1772 | /* Callback for iterate over threads. If the thread is stopped, but |
1773 | the user/frontend doesn't know about that yet, go through | |
1774 | normal_stop, as if the thread had just stopped now. ARG points at | |
1775 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
1776 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
1777 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
1778 | PTID. */ | |
1779 | ||
1780 | static int | |
1781 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
1782 | { | |
1783 | ptid_t ptid = * (ptid_t *) arg; | |
1784 | ||
1785 | if ((ptid_equal (info->ptid, ptid) | |
1786 | || ptid_equal (minus_one_ptid, ptid) | |
1787 | || (ptid_is_pid (ptid) | |
1788 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
1789 | && is_running (info->ptid) | |
1790 | && !is_executing (info->ptid)) | |
1791 | { | |
1792 | struct cleanup *old_chain; | |
1793 | struct execution_control_state ecss; | |
1794 | struct execution_control_state *ecs = &ecss; | |
1795 | ||
1796 | memset (ecs, 0, sizeof (*ecs)); | |
1797 | ||
1798 | old_chain = make_cleanup_restore_current_thread (); | |
1799 | ||
1800 | switch_to_thread (info->ptid); | |
1801 | ||
1802 | /* Go through handle_inferior_event/normal_stop, so we always | |
1803 | have consistent output as if the stop event had been | |
1804 | reported. */ | |
1805 | ecs->ptid = info->ptid; | |
e09875d4 | 1806 | ecs->event_thread = find_thread_ptid (info->ptid); |
252fbfc8 PA |
1807 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
1808 | ecs->ws.value.sig = TARGET_SIGNAL_0; | |
1809 | ||
1810 | handle_inferior_event (ecs); | |
1811 | ||
1812 | if (!ecs->wait_some_more) | |
1813 | { | |
1814 | struct thread_info *tp; | |
1815 | ||
1816 | normal_stop (); | |
1817 | ||
1818 | /* Finish off the continuations. The continations | |
1819 | themselves are responsible for realising the thread | |
1820 | didn't finish what it was supposed to do. */ | |
1821 | tp = inferior_thread (); | |
1822 | do_all_intermediate_continuations_thread (tp); | |
1823 | do_all_continuations_thread (tp); | |
1824 | } | |
1825 | ||
1826 | do_cleanups (old_chain); | |
1827 | } | |
1828 | ||
1829 | return 0; | |
1830 | } | |
1831 | ||
1832 | /* This function is attached as a "thread_stop_requested" observer. | |
1833 | Cleanup local state that assumed the PTID was to be resumed, and | |
1834 | report the stop to the frontend. */ | |
1835 | ||
2c0b251b | 1836 | static void |
252fbfc8 PA |
1837 | infrun_thread_stop_requested (ptid_t ptid) |
1838 | { | |
1839 | struct displaced_step_request *it, *next, *prev = NULL; | |
1840 | ||
1841 | /* PTID was requested to stop. Remove it from the displaced | |
1842 | stepping queue, so we don't try to resume it automatically. */ | |
1843 | for (it = displaced_step_request_queue; it; it = next) | |
1844 | { | |
1845 | next = it->next; | |
1846 | ||
1847 | if (ptid_equal (it->ptid, ptid) | |
1848 | || ptid_equal (minus_one_ptid, ptid) | |
1849 | || (ptid_is_pid (ptid) | |
1850 | && ptid_get_pid (ptid) == ptid_get_pid (it->ptid))) | |
1851 | { | |
1852 | if (displaced_step_request_queue == it) | |
1853 | displaced_step_request_queue = it->next; | |
1854 | else | |
1855 | prev->next = it->next; | |
1856 | ||
1857 | xfree (it); | |
1858 | } | |
1859 | else | |
1860 | prev = it; | |
1861 | } | |
1862 | ||
1863 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
1864 | } | |
1865 | ||
a07daef3 PA |
1866 | static void |
1867 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
1868 | { | |
1869 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
1870 | nullify_last_target_wait_ptid (); | |
1871 | } | |
1872 | ||
4e1c45ea PA |
1873 | /* Callback for iterate_over_threads. */ |
1874 | ||
1875 | static int | |
1876 | delete_step_resume_breakpoint_callback (struct thread_info *info, void *data) | |
1877 | { | |
1878 | if (is_exited (info->ptid)) | |
1879 | return 0; | |
1880 | ||
1881 | delete_step_resume_breakpoint (info); | |
1882 | return 0; | |
1883 | } | |
1884 | ||
1885 | /* In all-stop, delete the step resume breakpoint of any thread that | |
1886 | had one. In non-stop, delete the step resume breakpoint of the | |
1887 | thread that just stopped. */ | |
1888 | ||
1889 | static void | |
1890 | delete_step_thread_step_resume_breakpoint (void) | |
1891 | { | |
1892 | if (!target_has_execution | |
1893 | || ptid_equal (inferior_ptid, null_ptid)) | |
1894 | /* If the inferior has exited, we have already deleted the step | |
1895 | resume breakpoints out of GDB's lists. */ | |
1896 | return; | |
1897 | ||
1898 | if (non_stop) | |
1899 | { | |
1900 | /* If in non-stop mode, only delete the step-resume or | |
1901 | longjmp-resume breakpoint of the thread that just stopped | |
1902 | stepping. */ | |
1903 | struct thread_info *tp = inferior_thread (); | |
1904 | delete_step_resume_breakpoint (tp); | |
1905 | } | |
1906 | else | |
1907 | /* In all-stop mode, delete all step-resume and longjmp-resume | |
1908 | breakpoints of any thread that had them. */ | |
1909 | iterate_over_threads (delete_step_resume_breakpoint_callback, NULL); | |
1910 | } | |
1911 | ||
1912 | /* A cleanup wrapper. */ | |
1913 | ||
1914 | static void | |
1915 | delete_step_thread_step_resume_breakpoint_cleanup (void *arg) | |
1916 | { | |
1917 | delete_step_thread_step_resume_breakpoint (); | |
1918 | } | |
1919 | ||
223698f8 DE |
1920 | /* Pretty print the results of target_wait, for debugging purposes. */ |
1921 | ||
1922 | static void | |
1923 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, | |
1924 | const struct target_waitstatus *ws) | |
1925 | { | |
1926 | char *status_string = target_waitstatus_to_string (ws); | |
1927 | struct ui_file *tmp_stream = mem_fileopen (); | |
1928 | char *text; | |
1929 | long len; | |
1930 | ||
1931 | /* The text is split over several lines because it was getting too long. | |
1932 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
1933 | output as a unit; we want only one timestamp printed if debug_timestamp | |
1934 | is set. */ | |
1935 | ||
1936 | fprintf_unfiltered (tmp_stream, | |
1937 | "infrun: target_wait (%d", PIDGET (waiton_ptid)); | |
1938 | if (PIDGET (waiton_ptid) != -1) | |
1939 | fprintf_unfiltered (tmp_stream, | |
1940 | " [%s]", target_pid_to_str (waiton_ptid)); | |
1941 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
1942 | fprintf_unfiltered (tmp_stream, | |
1943 | "infrun: %d [%s],\n", | |
1944 | PIDGET (result_ptid), target_pid_to_str (result_ptid)); | |
1945 | fprintf_unfiltered (tmp_stream, | |
1946 | "infrun: %s\n", | |
1947 | status_string); | |
1948 | ||
1949 | text = ui_file_xstrdup (tmp_stream, &len); | |
1950 | ||
1951 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
1952 | a gcc error: the format attribute requires a string literal. */ | |
1953 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
1954 | ||
1955 | xfree (status_string); | |
1956 | xfree (text); | |
1957 | ui_file_delete (tmp_stream); | |
1958 | } | |
1959 | ||
cd0fc7c3 | 1960 | /* Wait for control to return from inferior to debugger. |
ae123ec6 JB |
1961 | |
1962 | If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals | |
1963 | as if they were SIGTRAP signals. This can be useful during | |
1964 | the startup sequence on some targets such as HP/UX, where | |
1965 | we receive an EXEC event instead of the expected SIGTRAP. | |
1966 | ||
cd0fc7c3 SS |
1967 | If inferior gets a signal, we may decide to start it up again |
1968 | instead of returning. That is why there is a loop in this function. | |
1969 | When this function actually returns it means the inferior | |
1970 | should be left stopped and GDB should read more commands. */ | |
1971 | ||
1972 | void | |
ae123ec6 | 1973 | wait_for_inferior (int treat_exec_as_sigtrap) |
cd0fc7c3 SS |
1974 | { |
1975 | struct cleanup *old_cleanups; | |
0d1e5fa7 | 1976 | struct execution_control_state ecss; |
cd0fc7c3 | 1977 | struct execution_control_state *ecs; |
c906108c | 1978 | |
527159b7 | 1979 | if (debug_infrun) |
ae123ec6 JB |
1980 | fprintf_unfiltered |
1981 | (gdb_stdlog, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n", | |
1982 | treat_exec_as_sigtrap); | |
527159b7 | 1983 | |
4e1c45ea PA |
1984 | old_cleanups = |
1985 | make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup, NULL); | |
cd0fc7c3 | 1986 | |
cd0fc7c3 | 1987 | ecs = &ecss; |
0d1e5fa7 PA |
1988 | memset (ecs, 0, sizeof (*ecs)); |
1989 | ||
cd0fc7c3 SS |
1990 | overlay_cache_invalid = 1; |
1991 | ||
e0bb1c1c PA |
1992 | /* We'll update this if & when we switch to a new thread. */ |
1993 | previous_inferior_ptid = inferior_ptid; | |
1994 | ||
cd0fc7c3 SS |
1995 | /* We have to invalidate the registers BEFORE calling target_wait |
1996 | because they can be loaded from the target while in target_wait. | |
1997 | This makes remote debugging a bit more efficient for those | |
1998 | targets that provide critical registers as part of their normal | |
1999 | status mechanism. */ | |
2000 | ||
2001 | registers_changed (); | |
b83266a0 | 2002 | |
c906108c SS |
2003 | while (1) |
2004 | { | |
29f49a6a PA |
2005 | struct cleanup *old_chain; |
2006 | ||
9a4105ab | 2007 | if (deprecated_target_wait_hook) |
47608cb1 | 2008 | ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws, 0); |
cd0fc7c3 | 2009 | else |
47608cb1 | 2010 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 2011 | |
f00150c9 | 2012 | if (debug_infrun) |
223698f8 | 2013 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2014 | |
ae123ec6 JB |
2015 | if (treat_exec_as_sigtrap && ecs->ws.kind == TARGET_WAITKIND_EXECD) |
2016 | { | |
2017 | xfree (ecs->ws.value.execd_pathname); | |
2018 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
2019 | ecs->ws.value.sig = TARGET_SIGNAL_TRAP; | |
2020 | } | |
2021 | ||
29f49a6a PA |
2022 | /* If an error happens while handling the event, propagate GDB's |
2023 | knowledge of the executing state to the frontend/user running | |
2024 | state. */ | |
2025 | old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2026 | ||
cd0fc7c3 SS |
2027 | /* Now figure out what to do with the result of the result. */ |
2028 | handle_inferior_event (ecs); | |
c906108c | 2029 | |
29f49a6a PA |
2030 | /* No error, don't finish the state yet. */ |
2031 | discard_cleanups (old_chain); | |
2032 | ||
cd0fc7c3 SS |
2033 | if (!ecs->wait_some_more) |
2034 | break; | |
2035 | } | |
4e1c45ea | 2036 | |
cd0fc7c3 SS |
2037 | do_cleanups (old_cleanups); |
2038 | } | |
c906108c | 2039 | |
43ff13b4 JM |
2040 | /* Asynchronous version of wait_for_inferior. It is called by the |
2041 | event loop whenever a change of state is detected on the file | |
2042 | descriptor corresponding to the target. It can be called more than | |
2043 | once to complete a single execution command. In such cases we need | |
a474d7c2 PA |
2044 | to keep the state in a global variable ECSS. If it is the last time |
2045 | that this function is called for a single execution command, then | |
2046 | report to the user that the inferior has stopped, and do the | |
2047 | necessary cleanups. */ | |
43ff13b4 JM |
2048 | |
2049 | void | |
fba45db2 | 2050 | fetch_inferior_event (void *client_data) |
43ff13b4 | 2051 | { |
0d1e5fa7 | 2052 | struct execution_control_state ecss; |
a474d7c2 | 2053 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 2054 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 2055 | struct cleanup *ts_old_chain; |
4f8d22e3 | 2056 | int was_sync = sync_execution; |
43ff13b4 | 2057 | |
0d1e5fa7 PA |
2058 | memset (ecs, 0, sizeof (*ecs)); |
2059 | ||
59f0d5d9 | 2060 | overlay_cache_invalid = 1; |
43ff13b4 | 2061 | |
e0bb1c1c PA |
2062 | /* We can only rely on wait_for_more being correct before handling |
2063 | the event in all-stop, but previous_inferior_ptid isn't used in | |
2064 | non-stop. */ | |
2065 | if (!ecs->wait_some_more) | |
2066 | /* We'll update this if & when we switch to a new thread. */ | |
2067 | previous_inferior_ptid = inferior_ptid; | |
2068 | ||
4f8d22e3 PA |
2069 | if (non_stop) |
2070 | /* In non-stop mode, the user/frontend should not notice a thread | |
2071 | switch due to internal events. Make sure we reverse to the | |
2072 | user selected thread and frame after handling the event and | |
2073 | running any breakpoint commands. */ | |
2074 | make_cleanup_restore_current_thread (); | |
2075 | ||
59f0d5d9 PA |
2076 | /* We have to invalidate the registers BEFORE calling target_wait |
2077 | because they can be loaded from the target while in target_wait. | |
2078 | This makes remote debugging a bit more efficient for those | |
2079 | targets that provide critical registers as part of their normal | |
2080 | status mechanism. */ | |
43ff13b4 | 2081 | |
59f0d5d9 | 2082 | registers_changed (); |
43ff13b4 | 2083 | |
9a4105ab | 2084 | if (deprecated_target_wait_hook) |
a474d7c2 | 2085 | ecs->ptid = |
47608cb1 | 2086 | deprecated_target_wait_hook (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2087 | else |
47608cb1 | 2088 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2089 | |
f00150c9 | 2090 | if (debug_infrun) |
223698f8 | 2091 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2092 | |
94cc34af PA |
2093 | if (non_stop |
2094 | && ecs->ws.kind != TARGET_WAITKIND_IGNORE | |
2095 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2096 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) | |
2097 | /* In non-stop mode, each thread is handled individually. Switch | |
2098 | early, so the global state is set correctly for this | |
2099 | thread. */ | |
2100 | context_switch (ecs->ptid); | |
2101 | ||
29f49a6a PA |
2102 | /* If an error happens while handling the event, propagate GDB's |
2103 | knowledge of the executing state to the frontend/user running | |
2104 | state. */ | |
2105 | if (!non_stop) | |
2106 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2107 | else | |
2108 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
2109 | ||
43ff13b4 | 2110 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 2111 | handle_inferior_event (ecs); |
43ff13b4 | 2112 | |
a474d7c2 | 2113 | if (!ecs->wait_some_more) |
43ff13b4 | 2114 | { |
d6b48e9c PA |
2115 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
2116 | ||
4e1c45ea | 2117 | delete_step_thread_step_resume_breakpoint (); |
f107f563 | 2118 | |
d6b48e9c PA |
2119 | /* We may not find an inferior if this was a process exit. */ |
2120 | if (inf == NULL || inf->stop_soon == NO_STOP_QUIETLY) | |
83c265ab PA |
2121 | normal_stop (); |
2122 | ||
af679fd0 PA |
2123 | if (target_has_execution |
2124 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2125 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
2126 | && ecs->event_thread->step_multi | |
414c69f7 | 2127 | && ecs->event_thread->stop_step) |
c2d11a7d JM |
2128 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); |
2129 | else | |
2130 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 | 2131 | } |
4f8d22e3 | 2132 | |
29f49a6a PA |
2133 | /* No error, don't finish the thread states yet. */ |
2134 | discard_cleanups (ts_old_chain); | |
2135 | ||
4f8d22e3 PA |
2136 | /* Revert thread and frame. */ |
2137 | do_cleanups (old_chain); | |
2138 | ||
2139 | /* If the inferior was in sync execution mode, and now isn't, | |
2140 | restore the prompt. */ | |
2141 | if (was_sync && !sync_execution) | |
2142 | display_gdb_prompt (0); | |
43ff13b4 JM |
2143 | } |
2144 | ||
cd0fc7c3 SS |
2145 | /* Prepare an execution control state for looping through a |
2146 | wait_for_inferior-type loop. */ | |
2147 | ||
2148 | void | |
96baa820 | 2149 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 SS |
2150 | { |
2151 | ecs->random_signal = 0; | |
0d1e5fa7 PA |
2152 | } |
2153 | ||
2154 | /* Clear context switchable stepping state. */ | |
2155 | ||
2156 | void | |
4e1c45ea | 2157 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 2158 | { |
2afb61aa PA |
2159 | struct symtab_and_line sal; |
2160 | ||
0d1e5fa7 PA |
2161 | tss->stepping_over_breakpoint = 0; |
2162 | tss->step_after_step_resume_breakpoint = 0; | |
2163 | tss->stepping_through_solib_after_catch = 0; | |
2164 | tss->stepping_through_solib_catchpoints = NULL; | |
2afb61aa | 2165 | |
4e1c45ea | 2166 | sal = find_pc_line (tss->prev_pc, 0); |
2afb61aa PA |
2167 | tss->current_line = sal.line; |
2168 | tss->current_symtab = sal.symtab; | |
cd0fc7c3 SS |
2169 | } |
2170 | ||
e02bc4cc | 2171 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
2172 | target_wait()/deprecated_target_wait_hook(). The data is actually |
2173 | cached by handle_inferior_event(), which gets called immediately | |
2174 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
2175 | |
2176 | void | |
488f131b | 2177 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 2178 | { |
39f77062 | 2179 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
2180 | *status = target_last_waitstatus; |
2181 | } | |
2182 | ||
ac264b3b MS |
2183 | void |
2184 | nullify_last_target_wait_ptid (void) | |
2185 | { | |
2186 | target_last_wait_ptid = minus_one_ptid; | |
2187 | } | |
2188 | ||
dcf4fbde | 2189 | /* Switch thread contexts. */ |
dd80620e MS |
2190 | |
2191 | static void | |
0d1e5fa7 | 2192 | context_switch (ptid_t ptid) |
dd80620e | 2193 | { |
fd48f117 DJ |
2194 | if (debug_infrun) |
2195 | { | |
2196 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
2197 | target_pid_to_str (inferior_ptid)); | |
2198 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 2199 | target_pid_to_str (ptid)); |
fd48f117 DJ |
2200 | } |
2201 | ||
0d1e5fa7 | 2202 | switch_to_thread (ptid); |
dd80620e MS |
2203 | } |
2204 | ||
4fa8626c DJ |
2205 | static void |
2206 | adjust_pc_after_break (struct execution_control_state *ecs) | |
2207 | { | |
24a73cce UW |
2208 | struct regcache *regcache; |
2209 | struct gdbarch *gdbarch; | |
8aad930b | 2210 | CORE_ADDR breakpoint_pc; |
4fa8626c | 2211 | |
4fa8626c DJ |
2212 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
2213 | we aren't, just return. | |
9709f61c DJ |
2214 | |
2215 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
2216 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
2217 | implemented by software breakpoints should be handled through the normal | |
2218 | breakpoint layer. | |
8fb3e588 | 2219 | |
4fa8626c DJ |
2220 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
2221 | different signals (SIGILL or SIGEMT for instance), but it is less | |
2222 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
2223 | gdbarch_decr_pc_after_break. I don't know any specific target that |
2224 | generates these signals at breakpoints (the code has been in GDB since at | |
2225 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 2226 | |
e6cf7916 UW |
2227 | In earlier versions of GDB, a target with |
2228 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
2229 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
2230 | target with both of these set in GDB history, and it seems unlikely to be | |
2231 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c DJ |
2232 | |
2233 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
2234 | return; | |
2235 | ||
2236 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
2237 | return; | |
2238 | ||
4058b839 PA |
2239 | /* In reverse execution, when a breakpoint is hit, the instruction |
2240 | under it has already been de-executed. The reported PC always | |
2241 | points at the breakpoint address, so adjusting it further would | |
2242 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
2243 | architecture: | |
2244 | ||
2245 | B1 0x08000000 : INSN1 | |
2246 | B2 0x08000001 : INSN2 | |
2247 | 0x08000002 : INSN3 | |
2248 | PC -> 0x08000003 : INSN4 | |
2249 | ||
2250 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
2251 | from that point should hit B2 as below. Reading the PC when the | |
2252 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
2253 | been de-executed already. | |
2254 | ||
2255 | B1 0x08000000 : INSN1 | |
2256 | B2 PC -> 0x08000001 : INSN2 | |
2257 | 0x08000002 : INSN3 | |
2258 | 0x08000003 : INSN4 | |
2259 | ||
2260 | We can't apply the same logic as for forward execution, because | |
2261 | we would wrongly adjust the PC to 0x08000000, since there's a | |
2262 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
2263 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
2264 | behaviour. */ | |
2265 | if (execution_direction == EXEC_REVERSE) | |
2266 | return; | |
2267 | ||
24a73cce UW |
2268 | /* If this target does not decrement the PC after breakpoints, then |
2269 | we have nothing to do. */ | |
2270 | regcache = get_thread_regcache (ecs->ptid); | |
2271 | gdbarch = get_regcache_arch (regcache); | |
2272 | if (gdbarch_decr_pc_after_break (gdbarch) == 0) | |
2273 | return; | |
2274 | ||
8aad930b AC |
2275 | /* Find the location where (if we've hit a breakpoint) the |
2276 | breakpoint would be. */ | |
515630c5 UW |
2277 | breakpoint_pc = regcache_read_pc (regcache) |
2278 | - gdbarch_decr_pc_after_break (gdbarch); | |
8aad930b | 2279 | |
1c5cfe86 PA |
2280 | /* Check whether there actually is a software breakpoint inserted at |
2281 | that location. | |
2282 | ||
2283 | If in non-stop mode, a race condition is possible where we've | |
2284 | removed a breakpoint, but stop events for that breakpoint were | |
2285 | already queued and arrive later. To suppress those spurious | |
2286 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
2287 | and retire them after a number of stop events are reported. */ | |
2288 | if (software_breakpoint_inserted_here_p (breakpoint_pc) | |
2289 | || (non_stop && moribund_breakpoint_here_p (breakpoint_pc))) | |
8aad930b | 2290 | { |
96429cc8 HZ |
2291 | struct cleanup *old_cleanups = NULL; |
2292 | if (RECORD_IS_USED) | |
2293 | old_cleanups = record_gdb_operation_disable_set (); | |
2294 | ||
1c0fdd0e UW |
2295 | /* When using hardware single-step, a SIGTRAP is reported for both |
2296 | a completed single-step and a software breakpoint. Need to | |
2297 | differentiate between the two, as the latter needs adjusting | |
2298 | but the former does not. | |
2299 | ||
2300 | The SIGTRAP can be due to a completed hardware single-step only if | |
2301 | - we didn't insert software single-step breakpoints | |
2302 | - the thread to be examined is still the current thread | |
2303 | - this thread is currently being stepped | |
2304 | ||
2305 | If any of these events did not occur, we must have stopped due | |
2306 | to hitting a software breakpoint, and have to back up to the | |
2307 | breakpoint address. | |
2308 | ||
2309 | As a special case, we could have hardware single-stepped a | |
2310 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
2311 | we also need to back up to the breakpoint address. */ | |
2312 | ||
2313 | if (singlestep_breakpoints_inserted_p | |
2314 | || !ptid_equal (ecs->ptid, inferior_ptid) | |
4e1c45ea PA |
2315 | || !currently_stepping (ecs->event_thread) |
2316 | || ecs->event_thread->prev_pc == breakpoint_pc) | |
515630c5 | 2317 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 HZ |
2318 | |
2319 | if (RECORD_IS_USED) | |
2320 | do_cleanups (old_cleanups); | |
8aad930b | 2321 | } |
4fa8626c DJ |
2322 | } |
2323 | ||
0d1e5fa7 PA |
2324 | void |
2325 | init_infwait_state (void) | |
2326 | { | |
2327 | waiton_ptid = pid_to_ptid (-1); | |
2328 | infwait_state = infwait_normal_state; | |
2329 | } | |
2330 | ||
94cc34af PA |
2331 | void |
2332 | error_is_running (void) | |
2333 | { | |
2334 | error (_("\ | |
2335 | Cannot execute this command while the selected thread is running.")); | |
2336 | } | |
2337 | ||
2338 | void | |
2339 | ensure_not_running (void) | |
2340 | { | |
2341 | if (is_running (inferior_ptid)) | |
2342 | error_is_running (); | |
2343 | } | |
2344 | ||
cd0fc7c3 SS |
2345 | /* Given an execution control state that has been freshly filled in |
2346 | by an event from the inferior, figure out what it means and take | |
2347 | appropriate action. */ | |
c906108c | 2348 | |
cd0fc7c3 | 2349 | void |
96baa820 | 2350 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 2351 | { |
c8edd8b4 | 2352 | int sw_single_step_trap_p = 0; |
d983da9c DJ |
2353 | int stopped_by_watchpoint; |
2354 | int stepped_after_stopped_by_watchpoint = 0; | |
2afb61aa | 2355 | struct symtab_and_line stop_pc_sal; |
d6b48e9c PA |
2356 | enum stop_kind stop_soon; |
2357 | ||
2358 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2359 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
2360 | && ecs->ws.kind != TARGET_WAITKIND_IGNORE) | |
2361 | { | |
2362 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
2363 | gdb_assert (inf); | |
2364 | stop_soon = inf->stop_soon; | |
2365 | } | |
2366 | else | |
2367 | stop_soon = NO_STOP_QUIETLY; | |
cd0fc7c3 | 2368 | |
e02bc4cc | 2369 | /* Cache the last pid/waitstatus. */ |
39f77062 | 2370 | target_last_wait_ptid = ecs->ptid; |
0d1e5fa7 | 2371 | target_last_waitstatus = ecs->ws; |
e02bc4cc | 2372 | |
ca005067 DJ |
2373 | /* Always clear state belonging to the previous time we stopped. */ |
2374 | stop_stack_dummy = 0; | |
2375 | ||
8c90c137 LM |
2376 | /* If it's a new process, add it to the thread database */ |
2377 | ||
2378 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) | |
2379 | && !ptid_equal (ecs->ptid, minus_one_ptid) | |
2380 | && !in_thread_list (ecs->ptid)); | |
2381 | ||
2382 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2383 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
2384 | add_thread (ecs->ptid); | |
2385 | ||
e09875d4 | 2386 | ecs->event_thread = find_thread_ptid (ecs->ptid); |
88ed393a JK |
2387 | |
2388 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
2389 | adjust_pc_after_break (ecs); | |
2390 | ||
2391 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
2392 | reinit_frame_cache (); | |
2393 | ||
8c90c137 LM |
2394 | if (ecs->ws.kind != TARGET_WAITKIND_IGNORE) |
2395 | { | |
1c5cfe86 PA |
2396 | breakpoint_retire_moribund (); |
2397 | ||
48844aa6 PA |
2398 | /* Mark the non-executing threads accordingly. In all-stop, all |
2399 | threads of all processes are stopped when we get any event | |
2400 | reported. In non-stop mode, only the event thread stops. If | |
2401 | we're handling a process exit in non-stop mode, there's | |
2402 | nothing to do, as threads of the dead process are gone, and | |
2403 | threads of any other process were left running. */ | |
2404 | if (!non_stop) | |
2405 | set_executing (minus_one_ptid, 0); | |
2406 | else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
2407 | && ecs->ws.kind != TARGET_WAITKIND_EXITED) | |
2408 | set_executing (inferior_ptid, 0); | |
8c90c137 LM |
2409 | } |
2410 | ||
0d1e5fa7 | 2411 | switch (infwait_state) |
488f131b JB |
2412 | { |
2413 | case infwait_thread_hop_state: | |
527159b7 | 2414 | if (debug_infrun) |
8a9de0e4 | 2415 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
488f131b | 2416 | /* Cancel the waiton_ptid. */ |
0d1e5fa7 | 2417 | waiton_ptid = pid_to_ptid (-1); |
65e82032 | 2418 | break; |
b83266a0 | 2419 | |
488f131b | 2420 | case infwait_normal_state: |
527159b7 | 2421 | if (debug_infrun) |
8a9de0e4 | 2422 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
d983da9c DJ |
2423 | break; |
2424 | ||
2425 | case infwait_step_watch_state: | |
2426 | if (debug_infrun) | |
2427 | fprintf_unfiltered (gdb_stdlog, | |
2428 | "infrun: infwait_step_watch_state\n"); | |
2429 | ||
2430 | stepped_after_stopped_by_watchpoint = 1; | |
488f131b | 2431 | break; |
b83266a0 | 2432 | |
488f131b | 2433 | case infwait_nonstep_watch_state: |
527159b7 | 2434 | if (debug_infrun) |
8a9de0e4 AC |
2435 | fprintf_unfiltered (gdb_stdlog, |
2436 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 2437 | insert_breakpoints (); |
c906108c | 2438 | |
488f131b JB |
2439 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
2440 | handle things like signals arriving and other things happening | |
2441 | in combination correctly? */ | |
2442 | stepped_after_stopped_by_watchpoint = 1; | |
2443 | break; | |
65e82032 AC |
2444 | |
2445 | default: | |
e2e0b3e5 | 2446 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b | 2447 | } |
0d1e5fa7 | 2448 | infwait_state = infwait_normal_state; |
c906108c | 2449 | |
488f131b JB |
2450 | switch (ecs->ws.kind) |
2451 | { | |
2452 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 2453 | if (debug_infrun) |
8a9de0e4 | 2454 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
b0f4b84b DJ |
2455 | /* Ignore gracefully during startup of the inferior, as it might |
2456 | be the shell which has just loaded some objects, otherwise | |
2457 | add the symbols for the newly loaded objects. Also ignore at | |
2458 | the beginning of an attach or remote session; we will query | |
2459 | the full list of libraries once the connection is | |
2460 | established. */ | |
c0236d92 | 2461 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 2462 | { |
488f131b JB |
2463 | /* Check for any newly added shared libraries if we're |
2464 | supposed to be adding them automatically. Switch | |
2465 | terminal for any messages produced by | |
2466 | breakpoint_re_set. */ | |
2467 | target_terminal_ours_for_output (); | |
aff6338a | 2468 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
2469 | stack's section table is kept up-to-date. Architectures, |
2470 | (e.g., PPC64), use the section table to perform | |
2471 | operations such as address => section name and hence | |
2472 | require the table to contain all sections (including | |
2473 | those found in shared libraries). */ | |
b0f4b84b | 2474 | #ifdef SOLIB_ADD |
aff6338a | 2475 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
b0f4b84b DJ |
2476 | #else |
2477 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
2478 | #endif | |
488f131b JB |
2479 | target_terminal_inferior (); |
2480 | ||
b0f4b84b DJ |
2481 | /* If requested, stop when the dynamic linker notifies |
2482 | gdb of events. This allows the user to get control | |
2483 | and place breakpoints in initializer routines for | |
2484 | dynamically loaded objects (among other things). */ | |
2485 | if (stop_on_solib_events) | |
2486 | { | |
2487 | stop_stepping (ecs); | |
2488 | return; | |
2489 | } | |
2490 | ||
2491 | /* NOTE drow/2007-05-11: This might be a good place to check | |
2492 | for "catch load". */ | |
488f131b | 2493 | } |
b0f4b84b DJ |
2494 | |
2495 | /* If we are skipping through a shell, or through shared library | |
2496 | loading that we aren't interested in, resume the program. If | |
2497 | we're running the program normally, also resume. But stop if | |
2498 | we're attaching or setting up a remote connection. */ | |
2499 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
2500 | { | |
74960c60 VP |
2501 | /* Loading of shared libraries might have changed breakpoint |
2502 | addresses. Make sure new breakpoints are inserted. */ | |
0b02b92d UW |
2503 | if (stop_soon == NO_STOP_QUIETLY |
2504 | && !breakpoints_always_inserted_mode ()) | |
74960c60 | 2505 | insert_breakpoints (); |
b0f4b84b DJ |
2506 | resume (0, TARGET_SIGNAL_0); |
2507 | prepare_to_wait (ecs); | |
2508 | return; | |
2509 | } | |
2510 | ||
2511 | break; | |
c5aa993b | 2512 | |
488f131b | 2513 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 2514 | if (debug_infrun) |
8a9de0e4 | 2515 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
2516 | resume (0, TARGET_SIGNAL_0); |
2517 | prepare_to_wait (ecs); | |
2518 | return; | |
c5aa993b | 2519 | |
488f131b | 2520 | case TARGET_WAITKIND_EXITED: |
527159b7 | 2521 | if (debug_infrun) |
8a9de0e4 | 2522 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
fb66883a | 2523 | inferior_ptid = ecs->ptid; |
488f131b JB |
2524 | target_terminal_ours (); /* Must do this before mourn anyway */ |
2525 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
2526 | ||
2527 | /* Record the exit code in the convenience variable $_exitcode, so | |
2528 | that the user can inspect this again later. */ | |
4fa62494 UW |
2529 | set_internalvar_integer (lookup_internalvar ("_exitcode"), |
2530 | (LONGEST) ecs->ws.value.integer); | |
488f131b JB |
2531 | gdb_flush (gdb_stdout); |
2532 | target_mourn_inferior (); | |
1c0fdd0e | 2533 | singlestep_breakpoints_inserted_p = 0; |
488f131b JB |
2534 | stop_print_frame = 0; |
2535 | stop_stepping (ecs); | |
2536 | return; | |
c5aa993b | 2537 | |
488f131b | 2538 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 2539 | if (debug_infrun) |
8a9de0e4 | 2540 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
fb66883a | 2541 | inferior_ptid = ecs->ptid; |
488f131b | 2542 | stop_print_frame = 0; |
488f131b | 2543 | target_terminal_ours (); /* Must do this before mourn anyway */ |
c5aa993b | 2544 | |
488f131b JB |
2545 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
2546 | reach here unless the inferior is dead. However, for years | |
2547 | target_kill() was called here, which hints that fatal signals aren't | |
2548 | really fatal on some systems. If that's true, then some changes | |
2549 | may be needed. */ | |
2550 | target_mourn_inferior (); | |
c906108c | 2551 | |
2020b7ab | 2552 | print_stop_reason (SIGNAL_EXITED, ecs->ws.value.sig); |
1c0fdd0e | 2553 | singlestep_breakpoints_inserted_p = 0; |
488f131b JB |
2554 | stop_stepping (ecs); |
2555 | return; | |
c906108c | 2556 | |
488f131b JB |
2557 | /* The following are the only cases in which we keep going; |
2558 | the above cases end in a continue or goto. */ | |
2559 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 2560 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 2561 | if (debug_infrun) |
8a9de0e4 | 2562 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
c906108c | 2563 | |
5a2901d9 DJ |
2564 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
2565 | { | |
0d1e5fa7 | 2566 | context_switch (ecs->ptid); |
35f196d9 | 2567 | reinit_frame_cache (); |
5a2901d9 DJ |
2568 | } |
2569 | ||
b242c3c2 PA |
2570 | /* Immediately detach breakpoints from the child before there's |
2571 | any chance of letting the user delete breakpoints from the | |
2572 | breakpoint lists. If we don't do this early, it's easy to | |
2573 | leave left over traps in the child, vis: "break foo; catch | |
2574 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
2575 | the fork on the last `continue', and by that time the | |
2576 | breakpoint at "foo" is long gone from the breakpoint table. | |
2577 | If we vforked, then we don't need to unpatch here, since both | |
2578 | parent and child are sharing the same memory pages; we'll | |
2579 | need to unpatch at follow/detach time instead to be certain | |
2580 | that new breakpoints added between catchpoint hit time and | |
2581 | vfork follow are detached. */ | |
2582 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
2583 | { | |
2584 | int child_pid = ptid_get_pid (ecs->ws.value.related_pid); | |
2585 | ||
2586 | /* This won't actually modify the breakpoint list, but will | |
2587 | physically remove the breakpoints from the child. */ | |
2588 | detach_breakpoints (child_pid); | |
2589 | } | |
2590 | ||
e58b0e63 PA |
2591 | /* In case the event is caught by a catchpoint, remember that |
2592 | the event is to be followed at the next resume of the thread, | |
2593 | and not immediately. */ | |
2594 | ecs->event_thread->pending_follow = ecs->ws; | |
2595 | ||
fb14de7b | 2596 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 2597 | |
347bddb7 | 2598 | ecs->event_thread->stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); |
675bf4cb | 2599 | |
347bddb7 | 2600 | ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat); |
04e68871 DJ |
2601 | |
2602 | /* If no catchpoint triggered for this, then keep going. */ | |
2603 | if (ecs->random_signal) | |
2604 | { | |
e58b0e63 PA |
2605 | int should_resume; |
2606 | ||
2020b7ab | 2607 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; |
e58b0e63 PA |
2608 | |
2609 | should_resume = follow_fork (); | |
2610 | ||
2611 | ecs->event_thread = inferior_thread (); | |
2612 | ecs->ptid = inferior_ptid; | |
2613 | ||
2614 | if (should_resume) | |
2615 | keep_going (ecs); | |
2616 | else | |
2617 | stop_stepping (ecs); | |
04e68871 DJ |
2618 | return; |
2619 | } | |
2020b7ab | 2620 | ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
2621 | goto process_event_stop_test; |
2622 | ||
2623 | case TARGET_WAITKIND_EXECD: | |
527159b7 | 2624 | if (debug_infrun) |
fc5261f2 | 2625 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 2626 | |
5a2901d9 DJ |
2627 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
2628 | { | |
0d1e5fa7 | 2629 | context_switch (ecs->ptid); |
35f196d9 | 2630 | reinit_frame_cache (); |
5a2901d9 DJ |
2631 | } |
2632 | ||
fb14de7b | 2633 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f PA |
2634 | |
2635 | /* This causes the eventpoints and symbol table to be reset. | |
2636 | Must do this now, before trying to determine whether to | |
2637 | stop. */ | |
71b43ef8 | 2638 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f PA |
2639 | |
2640 | ecs->event_thread->stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); | |
2641 | ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat); | |
2642 | ||
71b43ef8 PA |
2643 | /* Note that this may be referenced from inside |
2644 | bpstat_stop_status above, through inferior_has_execd. */ | |
2645 | xfree (ecs->ws.value.execd_pathname); | |
2646 | ecs->ws.value.execd_pathname = NULL; | |
2647 | ||
04e68871 DJ |
2648 | /* If no catchpoint triggered for this, then keep going. */ |
2649 | if (ecs->random_signal) | |
2650 | { | |
2020b7ab | 2651 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; |
04e68871 DJ |
2652 | keep_going (ecs); |
2653 | return; | |
2654 | } | |
2020b7ab | 2655 | ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
2656 | goto process_event_stop_test; |
2657 | ||
b4dc5ffa MK |
2658 | /* Be careful not to try to gather much state about a thread |
2659 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 2660 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 2661 | if (debug_infrun) |
8a9de0e4 | 2662 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
488f131b JB |
2663 | resume (0, TARGET_SIGNAL_0); |
2664 | prepare_to_wait (ecs); | |
2665 | return; | |
c906108c | 2666 | |
488f131b JB |
2667 | /* Before examining the threads further, step this thread to |
2668 | get it entirely out of the syscall. (We get notice of the | |
2669 | event when the thread is just on the verge of exiting a | |
2670 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 2671 | into user code.) */ |
488f131b | 2672 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 2673 | if (debug_infrun) |
8a9de0e4 | 2674 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
488f131b | 2675 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
488f131b JB |
2676 | prepare_to_wait (ecs); |
2677 | return; | |
c906108c | 2678 | |
488f131b | 2679 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 2680 | if (debug_infrun) |
8a9de0e4 | 2681 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
2020b7ab | 2682 | ecs->event_thread->stop_signal = ecs->ws.value.sig; |
488f131b | 2683 | break; |
c906108c | 2684 | |
b2175913 MS |
2685 | case TARGET_WAITKIND_NO_HISTORY: |
2686 | /* Reverse execution: target ran out of history info. */ | |
fb14de7b | 2687 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
b2175913 MS |
2688 | print_stop_reason (NO_HISTORY, 0); |
2689 | stop_stepping (ecs); | |
2690 | return; | |
2691 | ||
488f131b JB |
2692 | /* We had an event in the inferior, but we are not interested |
2693 | in handling it at this level. The lower layers have already | |
8e7d2c16 | 2694 | done what needs to be done, if anything. |
8fb3e588 AC |
2695 | |
2696 | One of the possible circumstances for this is when the | |
2697 | inferior produces output for the console. The inferior has | |
2698 | not stopped, and we are ignoring the event. Another possible | |
2699 | circumstance is any event which the lower level knows will be | |
2700 | reported multiple times without an intervening resume. */ | |
488f131b | 2701 | case TARGET_WAITKIND_IGNORE: |
527159b7 | 2702 | if (debug_infrun) |
8a9de0e4 | 2703 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); |
8e7d2c16 | 2704 | prepare_to_wait (ecs); |
488f131b JB |
2705 | return; |
2706 | } | |
c906108c | 2707 | |
488f131b JB |
2708 | if (ecs->new_thread_event) |
2709 | { | |
94cc34af PA |
2710 | if (non_stop) |
2711 | /* Non-stop assumes that the target handles adding new threads | |
2712 | to the thread list. */ | |
2713 | internal_error (__FILE__, __LINE__, "\ | |
2714 | targets should add new threads to the thread list themselves in non-stop mode."); | |
2715 | ||
2716 | /* We may want to consider not doing a resume here in order to | |
2717 | give the user a chance to play with the new thread. It might | |
2718 | be good to make that a user-settable option. */ | |
2719 | ||
2720 | /* At this point, all threads are stopped (happens automatically | |
2721 | in either the OS or the native code). Therefore we need to | |
2722 | continue all threads in order to make progress. */ | |
2723 | ||
488f131b JB |
2724 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); |
2725 | prepare_to_wait (ecs); | |
2726 | return; | |
2727 | } | |
c906108c | 2728 | |
2020b7ab | 2729 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED) |
252fbfc8 PA |
2730 | { |
2731 | /* Do we need to clean up the state of a thread that has | |
2732 | completed a displaced single-step? (Doing so usually affects | |
2733 | the PC, so do it here, before we set stop_pc.) */ | |
2734 | displaced_step_fixup (ecs->ptid, ecs->event_thread->stop_signal); | |
2735 | ||
2736 | /* If we either finished a single-step or hit a breakpoint, but | |
2737 | the user wanted this thread to be stopped, pretend we got a | |
2738 | SIG0 (generic unsignaled stop). */ | |
2739 | ||
2740 | if (ecs->event_thread->stop_requested | |
2741 | && ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) | |
2742 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
2743 | } | |
237fc4c9 | 2744 | |
515630c5 | 2745 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 2746 | |
527159b7 | 2747 | if (debug_infrun) |
237fc4c9 PA |
2748 | { |
2749 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", | |
2750 | paddr_nz (stop_pc)); | |
d92524f1 | 2751 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
2752 | { |
2753 | CORE_ADDR addr; | |
2754 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); | |
2755 | ||
2756 | if (target_stopped_data_address (¤t_target, &addr)) | |
2757 | fprintf_unfiltered (gdb_stdlog, | |
2758 | "infrun: stopped data address = 0x%s\n", | |
2759 | paddr_nz (addr)); | |
2760 | else | |
2761 | fprintf_unfiltered (gdb_stdlog, | |
2762 | "infrun: (no data address available)\n"); | |
2763 | } | |
2764 | } | |
527159b7 | 2765 | |
9f976b41 DJ |
2766 | if (stepping_past_singlestep_breakpoint) |
2767 | { | |
1c0fdd0e | 2768 | gdb_assert (singlestep_breakpoints_inserted_p); |
9f976b41 DJ |
2769 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
2770 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
2771 | ||
2772 | stepping_past_singlestep_breakpoint = 0; | |
2773 | ||
2774 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
2775 | breakpoint, or stopped for some other reason. It would be nice if |
2776 | we could tell, but we can't reliably. */ | |
2020b7ab | 2777 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 2778 | { |
527159b7 | 2779 | if (debug_infrun) |
8a9de0e4 | 2780 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
9f976b41 | 2781 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 2782 | remove_single_step_breakpoints (); |
9f976b41 DJ |
2783 | singlestep_breakpoints_inserted_p = 0; |
2784 | ||
2785 | ecs->random_signal = 0; | |
2786 | ||
0d1e5fa7 | 2787 | context_switch (saved_singlestep_ptid); |
9a4105ab AC |
2788 | if (deprecated_context_hook) |
2789 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
2790 | |
2791 | resume (1, TARGET_SIGNAL_0); | |
2792 | prepare_to_wait (ecs); | |
2793 | return; | |
2794 | } | |
2795 | } | |
2796 | ||
ca67fcb8 | 2797 | if (!ptid_equal (deferred_step_ptid, null_ptid)) |
6a6b96b9 | 2798 | { |
94cc34af PA |
2799 | /* In non-stop mode, there's never a deferred_step_ptid set. */ |
2800 | gdb_assert (!non_stop); | |
2801 | ||
6a6b96b9 UW |
2802 | /* If we stopped for some other reason than single-stepping, ignore |
2803 | the fact that we were supposed to switch back. */ | |
2020b7ab | 2804 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
6a6b96b9 UW |
2805 | { |
2806 | if (debug_infrun) | |
2807 | fprintf_unfiltered (gdb_stdlog, | |
ca67fcb8 | 2808 | "infrun: handling deferred step\n"); |
6a6b96b9 UW |
2809 | |
2810 | /* Pull the single step breakpoints out of the target. */ | |
2811 | if (singlestep_breakpoints_inserted_p) | |
2812 | { | |
2813 | remove_single_step_breakpoints (); | |
2814 | singlestep_breakpoints_inserted_p = 0; | |
2815 | } | |
2816 | ||
2817 | /* Note: We do not call context_switch at this point, as the | |
2818 | context is already set up for stepping the original thread. */ | |
ca67fcb8 VP |
2819 | switch_to_thread (deferred_step_ptid); |
2820 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
2821 | /* Suppress spurious "Switching to ..." message. */ |
2822 | previous_inferior_ptid = inferior_ptid; | |
2823 | ||
2824 | resume (1, TARGET_SIGNAL_0); | |
2825 | prepare_to_wait (ecs); | |
2826 | return; | |
2827 | } | |
ca67fcb8 VP |
2828 | |
2829 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
2830 | } |
2831 | ||
488f131b JB |
2832 | /* See if a thread hit a thread-specific breakpoint that was meant for |
2833 | another thread. If so, then step that thread past the breakpoint, | |
2834 | and continue it. */ | |
2835 | ||
2020b7ab | 2836 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
488f131b | 2837 | { |
9f976b41 DJ |
2838 | int thread_hop_needed = 0; |
2839 | ||
f8d40ec8 JB |
2840 | /* Check if a regular breakpoint has been hit before checking |
2841 | for a potential single step breakpoint. Otherwise, GDB will | |
2842 | not see this breakpoint hit when stepping onto breakpoints. */ | |
c36b740a | 2843 | if (regular_breakpoint_inserted_here_p (stop_pc)) |
488f131b | 2844 | { |
c5aa993b | 2845 | ecs->random_signal = 0; |
4fa8626c | 2846 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
2847 | thread_hop_needed = 1; |
2848 | } | |
1c0fdd0e | 2849 | else if (singlestep_breakpoints_inserted_p) |
9f976b41 | 2850 | { |
fd48f117 DJ |
2851 | /* We have not context switched yet, so this should be true |
2852 | no matter which thread hit the singlestep breakpoint. */ | |
2853 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
2854 | if (debug_infrun) | |
2855 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
2856 | "trap for %s\n", | |
2857 | target_pid_to_str (ecs->ptid)); | |
2858 | ||
9f976b41 DJ |
2859 | ecs->random_signal = 0; |
2860 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
2861 | change when we go from single-threaded to multi-threaded. If | |
2862 | the singlestep_ptid is still in the list, assume that it is | |
2863 | really different from ecs->ptid. */ | |
2864 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
2865 | && in_thread_list (singlestep_ptid)) | |
2866 | { | |
fd48f117 DJ |
2867 | /* If the PC of the thread we were trying to single-step |
2868 | has changed, discard this event (which we were going | |
2869 | to ignore anyway), and pretend we saw that thread | |
2870 | trap. This prevents us continuously moving the | |
2871 | single-step breakpoint forward, one instruction at a | |
2872 | time. If the PC has changed, then the thread we were | |
2873 | trying to single-step has trapped or been signalled, | |
2874 | but the event has not been reported to GDB yet. | |
2875 | ||
2876 | There might be some cases where this loses signal | |
2877 | information, if a signal has arrived at exactly the | |
2878 | same time that the PC changed, but this is the best | |
2879 | we can do with the information available. Perhaps we | |
2880 | should arrange to report all events for all threads | |
2881 | when they stop, or to re-poll the remote looking for | |
2882 | this particular thread (i.e. temporarily enable | |
2883 | schedlock). */ | |
515630c5 UW |
2884 | |
2885 | CORE_ADDR new_singlestep_pc | |
2886 | = regcache_read_pc (get_thread_regcache (singlestep_ptid)); | |
2887 | ||
2888 | if (new_singlestep_pc != singlestep_pc) | |
fd48f117 | 2889 | { |
2020b7ab PA |
2890 | enum target_signal stop_signal; |
2891 | ||
fd48f117 DJ |
2892 | if (debug_infrun) |
2893 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
2894 | " but expected thread advanced also\n"); | |
2895 | ||
2896 | /* The current context still belongs to | |
2897 | singlestep_ptid. Don't swap here, since that's | |
2898 | the context we want to use. Just fudge our | |
2899 | state and continue. */ | |
2020b7ab PA |
2900 | stop_signal = ecs->event_thread->stop_signal; |
2901 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
fd48f117 | 2902 | ecs->ptid = singlestep_ptid; |
e09875d4 | 2903 | ecs->event_thread = find_thread_ptid (ecs->ptid); |
2020b7ab | 2904 | ecs->event_thread->stop_signal = stop_signal; |
515630c5 | 2905 | stop_pc = new_singlestep_pc; |
fd48f117 DJ |
2906 | } |
2907 | else | |
2908 | { | |
2909 | if (debug_infrun) | |
2910 | fprintf_unfiltered (gdb_stdlog, | |
2911 | "infrun: unexpected thread\n"); | |
2912 | ||
2913 | thread_hop_needed = 1; | |
2914 | stepping_past_singlestep_breakpoint = 1; | |
2915 | saved_singlestep_ptid = singlestep_ptid; | |
2916 | } | |
9f976b41 DJ |
2917 | } |
2918 | } | |
2919 | ||
2920 | if (thread_hop_needed) | |
8fb3e588 | 2921 | { |
237fc4c9 | 2922 | int remove_status = 0; |
8fb3e588 | 2923 | |
527159b7 | 2924 | if (debug_infrun) |
8a9de0e4 | 2925 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 2926 | |
b3444185 PA |
2927 | /* Switch context before touching inferior memory, the |
2928 | previous thread may have exited. */ | |
2929 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
2930 | context_switch (ecs->ptid); | |
2931 | ||
8fb3e588 AC |
2932 | /* Saw a breakpoint, but it was hit by the wrong thread. |
2933 | Just continue. */ | |
2934 | ||
1c0fdd0e | 2935 | if (singlestep_breakpoints_inserted_p) |
488f131b | 2936 | { |
8fb3e588 | 2937 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 2938 | remove_single_step_breakpoints (); |
8fb3e588 AC |
2939 | singlestep_breakpoints_inserted_p = 0; |
2940 | } | |
2941 | ||
237fc4c9 PA |
2942 | /* If the arch can displace step, don't remove the |
2943 | breakpoints. */ | |
2944 | if (!use_displaced_stepping (current_gdbarch)) | |
2945 | remove_status = remove_breakpoints (); | |
2946 | ||
8fb3e588 AC |
2947 | /* Did we fail to remove breakpoints? If so, try |
2948 | to set the PC past the bp. (There's at least | |
2949 | one situation in which we can fail to remove | |
2950 | the bp's: On HP-UX's that use ttrace, we can't | |
2951 | change the address space of a vforking child | |
2952 | process until the child exits (well, okay, not | |
2953 | then either :-) or execs. */ | |
2954 | if (remove_status != 0) | |
9d9cd7ac | 2955 | error (_("Cannot step over breakpoint hit in wrong thread")); |
8fb3e588 AC |
2956 | else |
2957 | { /* Single step */ | |
94cc34af PA |
2958 | if (!non_stop) |
2959 | { | |
2960 | /* Only need to require the next event from this | |
2961 | thread in all-stop mode. */ | |
2962 | waiton_ptid = ecs->ptid; | |
2963 | infwait_state = infwait_thread_hop_state; | |
2964 | } | |
8fb3e588 | 2965 | |
4e1c45ea | 2966 | ecs->event_thread->stepping_over_breakpoint = 1; |
8fb3e588 AC |
2967 | keep_going (ecs); |
2968 | registers_changed (); | |
2969 | return; | |
2970 | } | |
488f131b | 2971 | } |
1c0fdd0e | 2972 | else if (singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
2973 | { |
2974 | sw_single_step_trap_p = 1; | |
2975 | ecs->random_signal = 0; | |
2976 | } | |
488f131b JB |
2977 | } |
2978 | else | |
2979 | ecs->random_signal = 1; | |
c906108c | 2980 | |
488f131b | 2981 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
2982 | so, then switch to that thread. */ |
2983 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 2984 | { |
527159b7 | 2985 | if (debug_infrun) |
8a9de0e4 | 2986 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 2987 | |
0d1e5fa7 | 2988 | context_switch (ecs->ptid); |
c5aa993b | 2989 | |
9a4105ab AC |
2990 | if (deprecated_context_hook) |
2991 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 2992 | } |
c906108c | 2993 | |
1c0fdd0e | 2994 | if (singlestep_breakpoints_inserted_p) |
488f131b JB |
2995 | { |
2996 | /* Pull the single step breakpoints out of the target. */ | |
e0cd558a | 2997 | remove_single_step_breakpoints (); |
488f131b JB |
2998 | singlestep_breakpoints_inserted_p = 0; |
2999 | } | |
c906108c | 3000 | |
d983da9c DJ |
3001 | if (stepped_after_stopped_by_watchpoint) |
3002 | stopped_by_watchpoint = 0; | |
3003 | else | |
3004 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
3005 | ||
3006 | /* If necessary, step over this watchpoint. We'll be back to display | |
3007 | it in a moment. */ | |
3008 | if (stopped_by_watchpoint | |
d92524f1 | 3009 | && (target_have_steppable_watchpoint |
d983da9c | 3010 | || gdbarch_have_nonsteppable_watchpoint (current_gdbarch))) |
488f131b | 3011 | { |
488f131b JB |
3012 | /* At this point, we are stopped at an instruction which has |
3013 | attempted to write to a piece of memory under control of | |
3014 | a watchpoint. The instruction hasn't actually executed | |
3015 | yet. If we were to evaluate the watchpoint expression | |
3016 | now, we would get the old value, and therefore no change | |
3017 | would seem to have occurred. | |
3018 | ||
3019 | In order to make watchpoints work `right', we really need | |
3020 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
3021 | watchpoint expression. We do this by single-stepping the |
3022 | target. | |
3023 | ||
3024 | It may not be necessary to disable the watchpoint to stop over | |
3025 | it. For example, the PA can (with some kernel cooperation) | |
3026 | single step over a watchpoint without disabling the watchpoint. | |
3027 | ||
3028 | It is far more common to need to disable a watchpoint to step | |
3029 | the inferior over it. If we have non-steppable watchpoints, | |
3030 | we must disable the current watchpoint; it's simplest to | |
3031 | disable all watchpoints and breakpoints. */ | |
2facfe5c DD |
3032 | int hw_step = 1; |
3033 | ||
d92524f1 | 3034 | if (!target_have_steppable_watchpoint) |
d983da9c | 3035 | remove_breakpoints (); |
2facfe5c | 3036 | /* Single step */ |
fb14de7b | 3037 | hw_step = maybe_software_singlestep (current_gdbarch, stop_pc); |
2facfe5c | 3038 | target_resume (ecs->ptid, hw_step, TARGET_SIGNAL_0); |
b9412953 | 3039 | registers_changed (); |
0d1e5fa7 | 3040 | waiton_ptid = ecs->ptid; |
d92524f1 | 3041 | if (target_have_steppable_watchpoint) |
0d1e5fa7 | 3042 | infwait_state = infwait_step_watch_state; |
d983da9c | 3043 | else |
0d1e5fa7 | 3044 | infwait_state = infwait_nonstep_watch_state; |
488f131b JB |
3045 | prepare_to_wait (ecs); |
3046 | return; | |
3047 | } | |
3048 | ||
488f131b JB |
3049 | ecs->stop_func_start = 0; |
3050 | ecs->stop_func_end = 0; | |
3051 | ecs->stop_func_name = 0; | |
3052 | /* Don't care about return value; stop_func_start and stop_func_name | |
3053 | will both be 0 if it doesn't work. */ | |
3054 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
3055 | &ecs->stop_func_start, &ecs->stop_func_end); | |
cbf3b44a UW |
3056 | ecs->stop_func_start |
3057 | += gdbarch_deprecated_function_start_offset (current_gdbarch); | |
4e1c45ea | 3058 | ecs->event_thread->stepping_over_breakpoint = 0; |
347bddb7 | 3059 | bpstat_clear (&ecs->event_thread->stop_bpstat); |
414c69f7 | 3060 | ecs->event_thread->stop_step = 0; |
488f131b JB |
3061 | stop_print_frame = 1; |
3062 | ecs->random_signal = 0; | |
3063 | stopped_by_random_signal = 0; | |
488f131b | 3064 | |
2020b7ab | 3065 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
4e1c45ea | 3066 | && ecs->event_thread->trap_expected |
3352ef37 | 3067 | && gdbarch_single_step_through_delay_p (current_gdbarch) |
4e1c45ea | 3068 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 3069 | { |
b50d7442 | 3070 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 AC |
3071 | also on an instruction that needs to be stepped multiple |
3072 | times before it's been fully executing. E.g., architectures | |
3073 | with a delay slot. It needs to be stepped twice, once for | |
3074 | the instruction and once for the delay slot. */ | |
3075 | int step_through_delay | |
3076 | = gdbarch_single_step_through_delay (current_gdbarch, | |
3077 | get_current_frame ()); | |
527159b7 | 3078 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 3079 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
4e1c45ea | 3080 | if (ecs->event_thread->step_range_end == 0 && step_through_delay) |
3352ef37 AC |
3081 | { |
3082 | /* The user issued a continue when stopped at a breakpoint. | |
3083 | Set up for another trap and get out of here. */ | |
4e1c45ea | 3084 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
3085 | keep_going (ecs); |
3086 | return; | |
3087 | } | |
3088 | else if (step_through_delay) | |
3089 | { | |
3090 | /* The user issued a step when stopped at a breakpoint. | |
3091 | Maybe we should stop, maybe we should not - the delay | |
3092 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
3093 | case, don't decide that here, just set |
3094 | ecs->stepping_over_breakpoint, making sure we | |
3095 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 3096 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
3097 | } |
3098 | } | |
3099 | ||
488f131b JB |
3100 | /* Look at the cause of the stop, and decide what to do. |
3101 | The alternatives are: | |
0d1e5fa7 PA |
3102 | 1) stop_stepping and return; to really stop and return to the debugger, |
3103 | 2) keep_going and return to start up again | |
4e1c45ea | 3104 | (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once) |
488f131b JB |
3105 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 |
3106 | will be made according to the signal handling tables. */ | |
3107 | ||
3108 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
3109 | that have to do with the program's own actions. Note that |
3110 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
3111 | on the operating system version. Here we detect when a SIGILL or | |
3112 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
3113 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
3114 | when we're trying to execute a breakpoint instruction on a | |
3115 | non-executable stack. This happens for call dummy breakpoints | |
3116 | for architectures like SPARC that place call dummies on the | |
237fc4c9 | 3117 | stack. |
488f131b | 3118 | |
237fc4c9 PA |
3119 | If we're doing a displaced step past a breakpoint, then the |
3120 | breakpoint is always inserted at the original instruction; | |
3121 | non-standard signals can't be explained by the breakpoint. */ | |
2020b7ab | 3122 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
4e1c45ea | 3123 | || (! ecs->event_thread->trap_expected |
237fc4c9 | 3124 | && breakpoint_inserted_here_p (stop_pc) |
2020b7ab PA |
3125 | && (ecs->event_thread->stop_signal == TARGET_SIGNAL_ILL |
3126 | || ecs->event_thread->stop_signal == TARGET_SIGNAL_SEGV | |
3127 | || ecs->event_thread->stop_signal == TARGET_SIGNAL_EMT)) | |
b0f4b84b DJ |
3128 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP |
3129 | || stop_soon == STOP_QUIETLY_REMOTE) | |
488f131b | 3130 | { |
2020b7ab | 3131 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) |
488f131b | 3132 | { |
527159b7 | 3133 | if (debug_infrun) |
8a9de0e4 | 3134 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
3135 | stop_print_frame = 0; |
3136 | stop_stepping (ecs); | |
3137 | return; | |
3138 | } | |
c54cfec8 EZ |
3139 | |
3140 | /* This is originated from start_remote(), start_inferior() and | |
3141 | shared libraries hook functions. */ | |
b0f4b84b | 3142 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
488f131b | 3143 | { |
527159b7 | 3144 | if (debug_infrun) |
8a9de0e4 | 3145 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
3146 | stop_stepping (ecs); |
3147 | return; | |
3148 | } | |
3149 | ||
c54cfec8 | 3150 | /* This originates from attach_command(). We need to overwrite |
a0d21d28 PA |
3151 | the stop_signal here, because some kernels don't ignore a |
3152 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
3153 | See more comments in inferior.h. On the other hand, if we | |
a0ef4274 | 3154 | get a non-SIGSTOP, report it to the user - assume the backend |
a0d21d28 PA |
3155 | will handle the SIGSTOP if it should show up later. |
3156 | ||
3157 | Also consider that the attach is complete when we see a | |
3158 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
3159 | target extended-remote report it instead of a SIGSTOP | |
3160 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
e0ba6746 PA |
3161 | signal, so this is no exception. |
3162 | ||
3163 | Also consider that the attach is complete when we see a | |
3164 | TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
3165 | the target to stop all threads of the inferior, in case the | |
3166 | low level attach operation doesn't stop them implicitly. If | |
3167 | they weren't stopped implicitly, then the stub will report a | |
3168 | TARGET_SIGNAL_0, meaning: stopped for no particular reason | |
3169 | other than GDB's request. */ | |
a0ef4274 | 3170 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP |
2020b7ab | 3171 | && (ecs->event_thread->stop_signal == TARGET_SIGNAL_STOP |
e0ba6746 PA |
3172 | || ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
3173 | || ecs->event_thread->stop_signal == TARGET_SIGNAL_0)) | |
c54cfec8 EZ |
3174 | { |
3175 | stop_stepping (ecs); | |
2020b7ab | 3176 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; |
c54cfec8 EZ |
3177 | return; |
3178 | } | |
3179 | ||
fba57f8f | 3180 | /* See if there is a breakpoint at the current PC. */ |
347bddb7 | 3181 | ecs->event_thread->stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); |
fba57f8f VP |
3182 | |
3183 | /* Following in case break condition called a | |
3184 | function. */ | |
3185 | stop_print_frame = 1; | |
488f131b | 3186 | |
73dd234f | 3187 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
3188 | at one stage in the past included checks for an inferior |
3189 | function call's call dummy's return breakpoint. The original | |
3190 | comment, that went with the test, read: | |
73dd234f | 3191 | |
8fb3e588 AC |
3192 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
3193 | another signal besides SIGTRAP, so check here as well as | |
3194 | above.'' | |
73dd234f | 3195 | |
8002d778 | 3196 | If someone ever tries to get call dummys on a |
73dd234f | 3197 | non-executable stack to work (where the target would stop |
03cebad2 MK |
3198 | with something like a SIGSEGV), then those tests might need |
3199 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 3200 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
3201 | suspect that it won't be the case. |
3202 | ||
8fb3e588 AC |
3203 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
3204 | be necessary for call dummies on a non-executable stack on | |
3205 | SPARC. */ | |
73dd234f | 3206 | |
2020b7ab | 3207 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
488f131b | 3208 | ecs->random_signal |
347bddb7 | 3209 | = !(bpstat_explains_signal (ecs->event_thread->stop_bpstat) |
4e1c45ea PA |
3210 | || ecs->event_thread->trap_expected |
3211 | || (ecs->event_thread->step_range_end | |
3212 | && ecs->event_thread->step_resume_breakpoint == NULL)); | |
488f131b JB |
3213 | else |
3214 | { | |
347bddb7 | 3215 | ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat); |
488f131b | 3216 | if (!ecs->random_signal) |
2020b7ab | 3217 | ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
3218 | } |
3219 | } | |
3220 | ||
3221 | /* When we reach this point, we've pretty much decided | |
3222 | that the reason for stopping must've been a random | |
3223 | (unexpected) signal. */ | |
3224 | ||
3225 | else | |
3226 | ecs->random_signal = 1; | |
488f131b | 3227 | |
04e68871 | 3228 | process_event_stop_test: |
488f131b JB |
3229 | /* For the program's own signals, act according to |
3230 | the signal handling tables. */ | |
3231 | ||
3232 | if (ecs->random_signal) | |
3233 | { | |
3234 | /* Signal not for debugging purposes. */ | |
3235 | int printed = 0; | |
3236 | ||
527159b7 | 3237 | if (debug_infrun) |
2020b7ab PA |
3238 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", |
3239 | ecs->event_thread->stop_signal); | |
527159b7 | 3240 | |
488f131b JB |
3241 | stopped_by_random_signal = 1; |
3242 | ||
2020b7ab | 3243 | if (signal_print[ecs->event_thread->stop_signal]) |
488f131b JB |
3244 | { |
3245 | printed = 1; | |
3246 | target_terminal_ours_for_output (); | |
2020b7ab | 3247 | print_stop_reason (SIGNAL_RECEIVED, ecs->event_thread->stop_signal); |
488f131b | 3248 | } |
252fbfc8 PA |
3249 | /* Always stop on signals if we're either just gaining control |
3250 | of the program, or the user explicitly requested this thread | |
3251 | to remain stopped. */ | |
d6b48e9c | 3252 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 3253 | || ecs->event_thread->stop_requested |
d6b48e9c | 3254 | || signal_stop_state (ecs->event_thread->stop_signal)) |
488f131b JB |
3255 | { |
3256 | stop_stepping (ecs); | |
3257 | return; | |
3258 | } | |
3259 | /* If not going to stop, give terminal back | |
3260 | if we took it away. */ | |
3261 | else if (printed) | |
3262 | target_terminal_inferior (); | |
3263 | ||
3264 | /* Clear the signal if it should not be passed. */ | |
2020b7ab PA |
3265 | if (signal_program[ecs->event_thread->stop_signal] == 0) |
3266 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
488f131b | 3267 | |
fb14de7b | 3268 | if (ecs->event_thread->prev_pc == stop_pc |
4e1c45ea PA |
3269 | && ecs->event_thread->trap_expected |
3270 | && ecs->event_thread->step_resume_breakpoint == NULL) | |
68f53502 AC |
3271 | { |
3272 | /* We were just starting a new sequence, attempting to | |
3273 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 3274 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
3275 | of the stepping range so GDB needs to remember to, when |
3276 | the signal handler returns, resume stepping off that | |
3277 | breakpoint. */ | |
3278 | /* To simplify things, "continue" is forced to use the same | |
3279 | code paths as single-step - set a breakpoint at the | |
3280 | signal return address and then, once hit, step off that | |
3281 | breakpoint. */ | |
237fc4c9 PA |
3282 | if (debug_infrun) |
3283 | fprintf_unfiltered (gdb_stdlog, | |
3284 | "infrun: signal arrived while stepping over " | |
3285 | "breakpoint\n"); | |
d3169d93 | 3286 | |
44cbf7b5 | 3287 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
4e1c45ea | 3288 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
9d799f85 AC |
3289 | keep_going (ecs); |
3290 | return; | |
68f53502 | 3291 | } |
9d799f85 | 3292 | |
4e1c45ea | 3293 | if (ecs->event_thread->step_range_end != 0 |
2020b7ab | 3294 | && ecs->event_thread->stop_signal != TARGET_SIGNAL_0 |
4e1c45ea PA |
3295 | && (ecs->event_thread->step_range_start <= stop_pc |
3296 | && stop_pc < ecs->event_thread->step_range_end) | |
9d799f85 | 3297 | && frame_id_eq (get_frame_id (get_current_frame ()), |
4e1c45ea PA |
3298 | ecs->event_thread->step_frame_id) |
3299 | && ecs->event_thread->step_resume_breakpoint == NULL) | |
d303a6c7 AC |
3300 | { |
3301 | /* The inferior is about to take a signal that will take it | |
3302 | out of the single step range. Set a breakpoint at the | |
3303 | current PC (which is presumably where the signal handler | |
3304 | will eventually return) and then allow the inferior to | |
3305 | run free. | |
3306 | ||
3307 | Note that this is only needed for a signal delivered | |
3308 | while in the single-step range. Nested signals aren't a | |
3309 | problem as they eventually all return. */ | |
237fc4c9 PA |
3310 | if (debug_infrun) |
3311 | fprintf_unfiltered (gdb_stdlog, | |
3312 | "infrun: signal may take us out of " | |
3313 | "single-step range\n"); | |
3314 | ||
44cbf7b5 | 3315 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
9d799f85 AC |
3316 | keep_going (ecs); |
3317 | return; | |
d303a6c7 | 3318 | } |
9d799f85 AC |
3319 | |
3320 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
3321 | when either there's a nested signal, or when there's a | |
3322 | pending signal enabled just as the signal handler returns | |
3323 | (leaving the inferior at the step-resume-breakpoint without | |
3324 | actually executing it). Either way continue until the | |
3325 | breakpoint is really hit. */ | |
488f131b JB |
3326 | keep_going (ecs); |
3327 | return; | |
3328 | } | |
3329 | ||
3330 | /* Handle cases caused by hitting a breakpoint. */ | |
3331 | { | |
3332 | CORE_ADDR jmp_buf_pc; | |
3333 | struct bpstat_what what; | |
3334 | ||
347bddb7 | 3335 | what = bpstat_what (ecs->event_thread->stop_bpstat); |
488f131b JB |
3336 | |
3337 | if (what.call_dummy) | |
3338 | { | |
3339 | stop_stack_dummy = 1; | |
c5aa993b | 3340 | } |
c906108c | 3341 | |
488f131b | 3342 | switch (what.main_action) |
c5aa993b | 3343 | { |
488f131b | 3344 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
611c83ae PA |
3345 | /* If we hit the breakpoint at longjmp while stepping, we |
3346 | install a momentary breakpoint at the target of the | |
3347 | jmp_buf. */ | |
3348 | ||
3349 | if (debug_infrun) | |
3350 | fprintf_unfiltered (gdb_stdlog, | |
3351 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
3352 | ||
4e1c45ea | 3353 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 3354 | |
91104499 | 3355 | if (!gdbarch_get_longjmp_target_p (current_gdbarch) |
60ade65d UW |
3356 | || !gdbarch_get_longjmp_target (current_gdbarch, |
3357 | get_current_frame (), &jmp_buf_pc)) | |
c5aa993b | 3358 | { |
611c83ae PA |
3359 | if (debug_infrun) |
3360 | fprintf_unfiltered (gdb_stdlog, "\ | |
3361 | infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n"); | |
488f131b | 3362 | keep_going (ecs); |
104c1213 | 3363 | return; |
c5aa993b | 3364 | } |
488f131b | 3365 | |
611c83ae PA |
3366 | /* We're going to replace the current step-resume breakpoint |
3367 | with a longjmp-resume breakpoint. */ | |
4e1c45ea | 3368 | delete_step_resume_breakpoint (ecs->event_thread); |
611c83ae PA |
3369 | |
3370 | /* Insert a breakpoint at resume address. */ | |
3371 | insert_longjmp_resume_breakpoint (jmp_buf_pc); | |
c906108c | 3372 | |
488f131b JB |
3373 | keep_going (ecs); |
3374 | return; | |
c906108c | 3375 | |
488f131b | 3376 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
527159b7 | 3377 | if (debug_infrun) |
611c83ae PA |
3378 | fprintf_unfiltered (gdb_stdlog, |
3379 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
3380 | ||
4e1c45ea PA |
3381 | gdb_assert (ecs->event_thread->step_resume_breakpoint != NULL); |
3382 | delete_step_resume_breakpoint (ecs->event_thread); | |
611c83ae | 3383 | |
414c69f7 | 3384 | ecs->event_thread->stop_step = 1; |
611c83ae PA |
3385 | print_stop_reason (END_STEPPING_RANGE, 0); |
3386 | stop_stepping (ecs); | |
3387 | return; | |
488f131b JB |
3388 | |
3389 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 3390 | if (debug_infrun) |
8802d8ed | 3391 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
4e1c45ea | 3392 | ecs->event_thread->stepping_over_breakpoint = 1; |
488f131b JB |
3393 | /* Still need to check other stuff, at least the case |
3394 | where we are stepping and step out of the right range. */ | |
3395 | break; | |
c906108c | 3396 | |
488f131b | 3397 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 3398 | if (debug_infrun) |
8802d8ed | 3399 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
488f131b | 3400 | stop_print_frame = 1; |
c906108c | 3401 | |
d303a6c7 AC |
3402 | /* We are about to nuke the step_resume_breakpointt via the |
3403 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 3404 | |
488f131b JB |
3405 | stop_stepping (ecs); |
3406 | return; | |
c5aa993b | 3407 | |
488f131b | 3408 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 3409 | if (debug_infrun) |
8802d8ed | 3410 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
488f131b | 3411 | stop_print_frame = 0; |
c5aa993b | 3412 | |
d303a6c7 AC |
3413 | /* We are about to nuke the step_resume_breakpoin via the |
3414 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 3415 | |
488f131b | 3416 | stop_stepping (ecs); |
e441088d | 3417 | return; |
c5aa993b | 3418 | |
488f131b | 3419 | case BPSTAT_WHAT_STEP_RESUME: |
527159b7 | 3420 | if (debug_infrun) |
8802d8ed | 3421 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); |
527159b7 | 3422 | |
4e1c45ea PA |
3423 | delete_step_resume_breakpoint (ecs->event_thread); |
3424 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
68f53502 AC |
3425 | { |
3426 | /* Back when the step-resume breakpoint was inserted, we | |
3427 | were trying to single-step off a breakpoint. Go back | |
3428 | to doing that. */ | |
4e1c45ea PA |
3429 | ecs->event_thread->step_after_step_resume_breakpoint = 0; |
3430 | ecs->event_thread->stepping_over_breakpoint = 1; | |
68f53502 AC |
3431 | keep_going (ecs); |
3432 | return; | |
3433 | } | |
b2175913 MS |
3434 | if (stop_pc == ecs->stop_func_start |
3435 | && execution_direction == EXEC_REVERSE) | |
3436 | { | |
3437 | /* We are stepping over a function call in reverse, and | |
3438 | just hit the step-resume breakpoint at the start | |
3439 | address of the function. Go back to single-stepping, | |
3440 | which should take us back to the function call. */ | |
3441 | ecs->event_thread->stepping_over_breakpoint = 1; | |
3442 | keep_going (ecs); | |
3443 | return; | |
3444 | } | |
488f131b JB |
3445 | break; |
3446 | ||
488f131b | 3447 | case BPSTAT_WHAT_CHECK_SHLIBS: |
c906108c | 3448 | { |
527159b7 | 3449 | if (debug_infrun) |
8802d8ed | 3450 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n"); |
488f131b JB |
3451 | |
3452 | /* Check for any newly added shared libraries if we're | |
3453 | supposed to be adding them automatically. Switch | |
3454 | terminal for any messages produced by | |
3455 | breakpoint_re_set. */ | |
3456 | target_terminal_ours_for_output (); | |
aff6338a | 3457 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
3458 | stack's section table is kept up-to-date. Architectures, |
3459 | (e.g., PPC64), use the section table to perform | |
3460 | operations such as address => section name and hence | |
3461 | require the table to contain all sections (including | |
3462 | those found in shared libraries). */ | |
a77053c2 | 3463 | #ifdef SOLIB_ADD |
aff6338a | 3464 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
a77053c2 MK |
3465 | #else |
3466 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
3467 | #endif | |
488f131b JB |
3468 | target_terminal_inferior (); |
3469 | ||
488f131b JB |
3470 | /* If requested, stop when the dynamic linker notifies |
3471 | gdb of events. This allows the user to get control | |
3472 | and place breakpoints in initializer routines for | |
3473 | dynamically loaded objects (among other things). */ | |
877522db | 3474 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 3475 | { |
488f131b | 3476 | stop_stepping (ecs); |
d4f3574e SS |
3477 | return; |
3478 | } | |
c5aa993b | 3479 | else |
c5aa993b | 3480 | { |
488f131b | 3481 | /* We want to step over this breakpoint, then keep going. */ |
4e1c45ea | 3482 | ecs->event_thread->stepping_over_breakpoint = 1; |
488f131b | 3483 | break; |
c5aa993b | 3484 | } |
488f131b | 3485 | } |
488f131b | 3486 | break; |
c906108c | 3487 | |
488f131b JB |
3488 | case BPSTAT_WHAT_LAST: |
3489 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 3490 | |
488f131b JB |
3491 | case BPSTAT_WHAT_KEEP_CHECKING: |
3492 | break; | |
3493 | } | |
3494 | } | |
c906108c | 3495 | |
488f131b JB |
3496 | /* We come here if we hit a breakpoint but should not |
3497 | stop for it. Possibly we also were stepping | |
3498 | and should stop for that. So fall through and | |
3499 | test for stepping. But, if not stepping, | |
3500 | do not stop. */ | |
c906108c | 3501 | |
a7212384 UW |
3502 | /* In all-stop mode, if we're currently stepping but have stopped in |
3503 | some other thread, we need to switch back to the stepped thread. */ | |
3504 | if (!non_stop) | |
3505 | { | |
3506 | struct thread_info *tp; | |
b3444185 | 3507 | tp = iterate_over_threads (currently_stepping_or_nexting_callback, |
a7212384 UW |
3508 | ecs->event_thread); |
3509 | if (tp) | |
3510 | { | |
3511 | /* However, if the current thread is blocked on some internal | |
3512 | breakpoint, and we simply need to step over that breakpoint | |
3513 | to get it going again, do that first. */ | |
3514 | if ((ecs->event_thread->trap_expected | |
3515 | && ecs->event_thread->stop_signal != TARGET_SIGNAL_TRAP) | |
3516 | || ecs->event_thread->stepping_over_breakpoint) | |
3517 | { | |
3518 | keep_going (ecs); | |
3519 | return; | |
3520 | } | |
3521 | ||
66852e9c PA |
3522 | /* If the stepping thread exited, then don't try to switch |
3523 | back and resume it, which could fail in several different | |
3524 | ways depending on the target. Instead, just keep going. | |
3525 | ||
3526 | We can find a stepping dead thread in the thread list in | |
3527 | two cases: | |
3528 | ||
3529 | - The target supports thread exit events, and when the | |
3530 | target tries to delete the thread from the thread list, | |
3531 | inferior_ptid pointed at the exiting thread. In such | |
3532 | case, calling delete_thread does not really remove the | |
3533 | thread from the list; instead, the thread is left listed, | |
3534 | with 'exited' state. | |
3535 | ||
3536 | - The target's debug interface does not support thread | |
3537 | exit events, and so we have no idea whatsoever if the | |
3538 | previously stepping thread is still alive. For that | |
3539 | reason, we need to synchronously query the target | |
3540 | now. */ | |
b3444185 PA |
3541 | if (is_exited (tp->ptid) |
3542 | || !target_thread_alive (tp->ptid)) | |
3543 | { | |
3544 | if (debug_infrun) | |
3545 | fprintf_unfiltered (gdb_stdlog, "\ | |
3546 | infrun: not switching back to stepped thread, it has vanished\n"); | |
3547 | ||
3548 | delete_thread (tp->ptid); | |
3549 | keep_going (ecs); | |
3550 | return; | |
3551 | } | |
3552 | ||
a7212384 UW |
3553 | /* Otherwise, we no longer expect a trap in the current thread. |
3554 | Clear the trap_expected flag before switching back -- this is | |
3555 | what keep_going would do as well, if we called it. */ | |
3556 | ecs->event_thread->trap_expected = 0; | |
3557 | ||
3558 | if (debug_infrun) | |
3559 | fprintf_unfiltered (gdb_stdlog, | |
3560 | "infrun: switching back to stepped thread\n"); | |
3561 | ||
3562 | ecs->event_thread = tp; | |
3563 | ecs->ptid = tp->ptid; | |
3564 | context_switch (ecs->ptid); | |
3565 | keep_going (ecs); | |
3566 | return; | |
3567 | } | |
3568 | } | |
3569 | ||
9d1ff73f MS |
3570 | /* Are we stepping to get the inferior out of the dynamic linker's |
3571 | hook (and possibly the dld itself) after catching a shlib | |
3572 | event? */ | |
4e1c45ea | 3573 | if (ecs->event_thread->stepping_through_solib_after_catch) |
488f131b JB |
3574 | { |
3575 | #if defined(SOLIB_ADD) | |
3576 | /* Have we reached our destination? If not, keep going. */ | |
3577 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
3578 | { | |
527159b7 | 3579 | if (debug_infrun) |
8a9de0e4 | 3580 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
4e1c45ea | 3581 | ecs->event_thread->stepping_over_breakpoint = 1; |
488f131b | 3582 | keep_going (ecs); |
104c1213 | 3583 | return; |
488f131b JB |
3584 | } |
3585 | #endif | |
527159b7 | 3586 | if (debug_infrun) |
8a9de0e4 | 3587 | fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
488f131b JB |
3588 | /* Else, stop and report the catchpoint(s) whose triggering |
3589 | caused us to begin stepping. */ | |
4e1c45ea | 3590 | ecs->event_thread->stepping_through_solib_after_catch = 0; |
347bddb7 PA |
3591 | bpstat_clear (&ecs->event_thread->stop_bpstat); |
3592 | ecs->event_thread->stop_bpstat | |
3593 | = bpstat_copy (ecs->event_thread->stepping_through_solib_catchpoints); | |
4e1c45ea | 3594 | bpstat_clear (&ecs->event_thread->stepping_through_solib_catchpoints); |
488f131b JB |
3595 | stop_print_frame = 1; |
3596 | stop_stepping (ecs); | |
3597 | return; | |
3598 | } | |
c906108c | 3599 | |
4e1c45ea | 3600 | if (ecs->event_thread->step_resume_breakpoint) |
488f131b | 3601 | { |
527159b7 | 3602 | if (debug_infrun) |
d3169d93 DJ |
3603 | fprintf_unfiltered (gdb_stdlog, |
3604 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 3605 | |
488f131b JB |
3606 | /* Having a step-resume breakpoint overrides anything |
3607 | else having to do with stepping commands until | |
3608 | that breakpoint is reached. */ | |
488f131b JB |
3609 | keep_going (ecs); |
3610 | return; | |
3611 | } | |
c5aa993b | 3612 | |
4e1c45ea | 3613 | if (ecs->event_thread->step_range_end == 0) |
488f131b | 3614 | { |
527159b7 | 3615 | if (debug_infrun) |
8a9de0e4 | 3616 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 3617 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
3618 | keep_going (ecs); |
3619 | return; | |
3620 | } | |
c5aa993b | 3621 | |
488f131b | 3622 | /* If stepping through a line, keep going if still within it. |
c906108c | 3623 | |
488f131b JB |
3624 | Note that step_range_end is the address of the first instruction |
3625 | beyond the step range, and NOT the address of the last instruction | |
3626 | within it! */ | |
4e1c45ea PA |
3627 | if (stop_pc >= ecs->event_thread->step_range_start |
3628 | && stop_pc < ecs->event_thread->step_range_end) | |
488f131b | 3629 | { |
527159b7 | 3630 | if (debug_infrun) |
b2175913 | 3631 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n", |
4e1c45ea PA |
3632 | paddr_nz (ecs->event_thread->step_range_start), |
3633 | paddr_nz (ecs->event_thread->step_range_end)); | |
b2175913 MS |
3634 | |
3635 | /* When stepping backward, stop at beginning of line range | |
3636 | (unless it's the function entry point, in which case | |
3637 | keep going back to the call point). */ | |
3638 | if (stop_pc == ecs->event_thread->step_range_start | |
3639 | && stop_pc != ecs->stop_func_start | |
3640 | && execution_direction == EXEC_REVERSE) | |
3641 | { | |
3642 | ecs->event_thread->stop_step = 1; | |
3643 | print_stop_reason (END_STEPPING_RANGE, 0); | |
3644 | stop_stepping (ecs); | |
3645 | } | |
3646 | else | |
3647 | keep_going (ecs); | |
3648 | ||
488f131b JB |
3649 | return; |
3650 | } | |
c5aa993b | 3651 | |
488f131b | 3652 | /* We stepped out of the stepping range. */ |
c906108c | 3653 | |
488f131b JB |
3654 | /* If we are stepping at the source level and entered the runtime |
3655 | loader dynamic symbol resolution code, we keep on single stepping | |
3656 | until we exit the run time loader code and reach the callee's | |
3657 | address. */ | |
078130d0 | 3658 | if (ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 3659 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 3660 | { |
4c8c40e6 MK |
3661 | CORE_ADDR pc_after_resolver = |
3662 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 3663 | |
527159b7 | 3664 | if (debug_infrun) |
8a9de0e4 | 3665 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
527159b7 | 3666 | |
488f131b JB |
3667 | if (pc_after_resolver) |
3668 | { | |
3669 | /* Set up a step-resume breakpoint at the address | |
3670 | indicated by SKIP_SOLIB_RESOLVER. */ | |
3671 | struct symtab_and_line sr_sal; | |
fe39c653 | 3672 | init_sal (&sr_sal); |
488f131b JB |
3673 | sr_sal.pc = pc_after_resolver; |
3674 | ||
44cbf7b5 | 3675 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c5aa993b | 3676 | } |
c906108c | 3677 | |
488f131b JB |
3678 | keep_going (ecs); |
3679 | return; | |
3680 | } | |
c906108c | 3681 | |
4e1c45ea | 3682 | if (ecs->event_thread->step_range_end != 1 |
078130d0 PA |
3683 | && (ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE |
3684 | || ecs->event_thread->step_over_calls == STEP_OVER_ALL) | |
42edda50 | 3685 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) |
488f131b | 3686 | { |
527159b7 | 3687 | if (debug_infrun) |
8a9de0e4 | 3688 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
42edda50 | 3689 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
3690 | a signal trampoline (either by a signal being delivered or by |
3691 | the signal handler returning). Just single-step until the | |
3692 | inferior leaves the trampoline (either by calling the handler | |
3693 | or returning). */ | |
488f131b JB |
3694 | keep_going (ecs); |
3695 | return; | |
3696 | } | |
c906108c | 3697 | |
c17eaafe DJ |
3698 | /* Check for subroutine calls. The check for the current frame |
3699 | equalling the step ID is not necessary - the check of the | |
3700 | previous frame's ID is sufficient - but it is a common case and | |
3701 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
3702 | |
3703 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
3704 | being equal, so to get into this block, both the current and | |
3705 | previous frame must have valid frame IDs. */ | |
4e1c45ea PA |
3706 | if (!frame_id_eq (get_frame_id (get_current_frame ()), |
3707 | ecs->event_thread->step_frame_id) | |
b2175913 MS |
3708 | && (frame_id_eq (frame_unwind_id (get_current_frame ()), |
3709 | ecs->event_thread->step_frame_id) | |
3710 | || execution_direction == EXEC_REVERSE)) | |
488f131b | 3711 | { |
95918acb | 3712 | CORE_ADDR real_stop_pc; |
8fb3e588 | 3713 | |
527159b7 | 3714 | if (debug_infrun) |
8a9de0e4 | 3715 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 3716 | |
078130d0 | 3717 | if ((ecs->event_thread->step_over_calls == STEP_OVER_NONE) |
4e1c45ea PA |
3718 | || ((ecs->event_thread->step_range_end == 1) |
3719 | && in_prologue (ecs->event_thread->prev_pc, | |
3720 | ecs->stop_func_start))) | |
95918acb AC |
3721 | { |
3722 | /* I presume that step_over_calls is only 0 when we're | |
3723 | supposed to be stepping at the assembly language level | |
3724 | ("stepi"). Just stop. */ | |
3725 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
3726 | thought it was a subroutine call but it was not. Stop as | |
3727 | well. FENN */ | |
414c69f7 | 3728 | ecs->event_thread->stop_step = 1; |
95918acb AC |
3729 | print_stop_reason (END_STEPPING_RANGE, 0); |
3730 | stop_stepping (ecs); | |
3731 | return; | |
3732 | } | |
8fb3e588 | 3733 | |
078130d0 | 3734 | if (ecs->event_thread->step_over_calls == STEP_OVER_ALL) |
8567c30f | 3735 | { |
b2175913 MS |
3736 | /* We're doing a "next". |
3737 | ||
3738 | Normal (forward) execution: set a breakpoint at the | |
3739 | callee's return address (the address at which the caller | |
3740 | will resume). | |
3741 | ||
3742 | Reverse (backward) execution. set the step-resume | |
3743 | breakpoint at the start of the function that we just | |
3744 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 3745 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
3746 | |
3747 | if (execution_direction == EXEC_REVERSE) | |
3748 | { | |
3749 | struct symtab_and_line sr_sal; | |
3067f6e5 MS |
3750 | |
3751 | if (ecs->stop_func_start == 0 | |
3752 | && in_solib_dynsym_resolve_code (stop_pc)) | |
3753 | { | |
3754 | /* Stepped into runtime loader dynamic symbol | |
3755 | resolution code. Since we're in reverse, | |
3756 | we have already backed up through the runtime | |
3757 | loader and the dynamic function. This is just | |
3758 | the trampoline (jump table). | |
3759 | ||
3760 | Just keep stepping, we'll soon be home. | |
3761 | */ | |
3762 | keep_going (ecs); | |
3763 | return; | |
3764 | } | |
3765 | /* Normal (staticly linked) function call return. */ | |
b2175913 MS |
3766 | init_sal (&sr_sal); |
3767 | sr_sal.pc = ecs->stop_func_start; | |
3768 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
3769 | } | |
3770 | else | |
3771 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); | |
3772 | ||
8567c30f AC |
3773 | keep_going (ecs); |
3774 | return; | |
3775 | } | |
a53c66de | 3776 | |
95918acb | 3777 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
3778 | calling routine and the real function), locate the real |
3779 | function. That's what tells us (a) whether we want to step | |
3780 | into it at all, and (b) what prologue we want to run to the | |
3781 | end of, if we do step into it. */ | |
52f729a7 | 3782 | real_stop_pc = skip_language_trampoline (get_current_frame (), stop_pc); |
95918acb | 3783 | if (real_stop_pc == 0) |
52f729a7 UW |
3784 | real_stop_pc = gdbarch_skip_trampoline_code |
3785 | (current_gdbarch, get_current_frame (), stop_pc); | |
95918acb AC |
3786 | if (real_stop_pc != 0) |
3787 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 3788 | |
db5f024e | 3789 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
3790 | { |
3791 | struct symtab_and_line sr_sal; | |
3792 | init_sal (&sr_sal); | |
3793 | sr_sal.pc = ecs->stop_func_start; | |
3794 | ||
44cbf7b5 | 3795 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
8fb3e588 AC |
3796 | keep_going (ecs); |
3797 | return; | |
1b2bfbb9 RC |
3798 | } |
3799 | ||
95918acb | 3800 | /* If we have line number information for the function we are |
8fb3e588 | 3801 | thinking of stepping into, step into it. |
95918acb | 3802 | |
8fb3e588 AC |
3803 | If there are several symtabs at that PC (e.g. with include |
3804 | files), just want to know whether *any* of them have line | |
3805 | numbers. find_pc_line handles this. */ | |
95918acb AC |
3806 | { |
3807 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 3808 | |
95918acb AC |
3809 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
3810 | if (tmp_sal.line != 0) | |
3811 | { | |
b2175913 MS |
3812 | if (execution_direction == EXEC_REVERSE) |
3813 | handle_step_into_function_backward (ecs); | |
3814 | else | |
3815 | handle_step_into_function (ecs); | |
95918acb AC |
3816 | return; |
3817 | } | |
3818 | } | |
3819 | ||
3820 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
3821 | set, we stop the step so that the user has a chance to switch |
3822 | in assembly mode. */ | |
078130d0 PA |
3823 | if (ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE |
3824 | && step_stop_if_no_debug) | |
95918acb | 3825 | { |
414c69f7 | 3826 | ecs->event_thread->stop_step = 1; |
95918acb AC |
3827 | print_stop_reason (END_STEPPING_RANGE, 0); |
3828 | stop_stepping (ecs); | |
3829 | return; | |
3830 | } | |
3831 | ||
b2175913 MS |
3832 | if (execution_direction == EXEC_REVERSE) |
3833 | { | |
3834 | /* Set a breakpoint at callee's start address. | |
3835 | From there we can step once and be back in the caller. */ | |
3836 | struct symtab_and_line sr_sal; | |
3837 | init_sal (&sr_sal); | |
3838 | sr_sal.pc = ecs->stop_func_start; | |
3839 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
3840 | } | |
3841 | else | |
3842 | /* Set a breakpoint at callee's return address (the address | |
3843 | at which the caller will resume). */ | |
3844 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); | |
3845 | ||
95918acb | 3846 | keep_going (ecs); |
488f131b | 3847 | return; |
488f131b | 3848 | } |
c906108c | 3849 | |
488f131b JB |
3850 | /* If we're in the return path from a shared library trampoline, |
3851 | we want to proceed through the trampoline when stepping. */ | |
e76f05fa UW |
3852 | if (gdbarch_in_solib_return_trampoline (current_gdbarch, |
3853 | stop_pc, ecs->stop_func_name)) | |
488f131b | 3854 | { |
488f131b | 3855 | /* Determine where this trampoline returns. */ |
52f729a7 UW |
3856 | CORE_ADDR real_stop_pc; |
3857 | real_stop_pc = gdbarch_skip_trampoline_code | |
3858 | (current_gdbarch, get_current_frame (), stop_pc); | |
c906108c | 3859 | |
527159b7 | 3860 | if (debug_infrun) |
8a9de0e4 | 3861 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
527159b7 | 3862 | |
488f131b | 3863 | /* Only proceed through if we know where it's going. */ |
d764a824 | 3864 | if (real_stop_pc) |
488f131b JB |
3865 | { |
3866 | /* And put the step-breakpoint there and go until there. */ | |
3867 | struct symtab_and_line sr_sal; | |
3868 | ||
fe39c653 | 3869 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 3870 | sr_sal.pc = real_stop_pc; |
488f131b | 3871 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
44cbf7b5 AC |
3872 | |
3873 | /* Do not specify what the fp should be when we stop since | |
3874 | on some machines the prologue is where the new fp value | |
3875 | is established. */ | |
3876 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
c906108c | 3877 | |
488f131b JB |
3878 | /* Restart without fiddling with the step ranges or |
3879 | other state. */ | |
3880 | keep_going (ecs); | |
3881 | return; | |
3882 | } | |
3883 | } | |
c906108c | 3884 | |
2afb61aa | 3885 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 3886 | |
1b2bfbb9 RC |
3887 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
3888 | the trampoline processing logic, however, there are some trampolines | |
3889 | that have no names, so we should do trampoline handling first. */ | |
078130d0 | 3890 | if (ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 3891 | && ecs->stop_func_name == NULL |
2afb61aa | 3892 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 3893 | { |
527159b7 | 3894 | if (debug_infrun) |
8a9de0e4 | 3895 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
527159b7 | 3896 | |
1b2bfbb9 | 3897 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
3898 | undebuggable function (where there is no debugging information |
3899 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
3900 | inferior stopped). Since we want to skip this kind of code, |
3901 | we keep going until the inferior returns from this | |
14e60db5 DJ |
3902 | function - unless the user has asked us not to (via |
3903 | set step-mode) or we no longer know how to get back | |
3904 | to the call site. */ | |
3905 | if (step_stop_if_no_debug | |
eb2f4a08 | 3906 | || !frame_id_p (frame_unwind_id (get_current_frame ()))) |
1b2bfbb9 RC |
3907 | { |
3908 | /* If we have no line number and the step-stop-if-no-debug | |
3909 | is set, we stop the step so that the user has a chance to | |
3910 | switch in assembly mode. */ | |
414c69f7 | 3911 | ecs->event_thread->stop_step = 1; |
1b2bfbb9 RC |
3912 | print_stop_reason (END_STEPPING_RANGE, 0); |
3913 | stop_stepping (ecs); | |
3914 | return; | |
3915 | } | |
3916 | else | |
3917 | { | |
3918 | /* Set a breakpoint at callee's return address (the address | |
3919 | at which the caller will resume). */ | |
14e60db5 | 3920 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
1b2bfbb9 RC |
3921 | keep_going (ecs); |
3922 | return; | |
3923 | } | |
3924 | } | |
3925 | ||
4e1c45ea | 3926 | if (ecs->event_thread->step_range_end == 1) |
1b2bfbb9 RC |
3927 | { |
3928 | /* It is stepi or nexti. We always want to stop stepping after | |
3929 | one instruction. */ | |
527159b7 | 3930 | if (debug_infrun) |
8a9de0e4 | 3931 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
414c69f7 | 3932 | ecs->event_thread->stop_step = 1; |
1b2bfbb9 RC |
3933 | print_stop_reason (END_STEPPING_RANGE, 0); |
3934 | stop_stepping (ecs); | |
3935 | return; | |
3936 | } | |
3937 | ||
2afb61aa | 3938 | if (stop_pc_sal.line == 0) |
488f131b JB |
3939 | { |
3940 | /* We have no line number information. That means to stop | |
3941 | stepping (does this always happen right after one instruction, | |
3942 | when we do "s" in a function with no line numbers, | |
3943 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 3944 | if (debug_infrun) |
8a9de0e4 | 3945 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
414c69f7 | 3946 | ecs->event_thread->stop_step = 1; |
488f131b JB |
3947 | print_stop_reason (END_STEPPING_RANGE, 0); |
3948 | stop_stepping (ecs); | |
3949 | return; | |
3950 | } | |
c906108c | 3951 | |
2afb61aa | 3952 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
3953 | && (ecs->event_thread->current_line != stop_pc_sal.line |
3954 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
3955 | { |
3956 | /* We are at the start of a different line. So stop. Note that | |
3957 | we don't stop if we step into the middle of a different line. | |
3958 | That is said to make things like for (;;) statements work | |
3959 | better. */ | |
527159b7 | 3960 | if (debug_infrun) |
8a9de0e4 | 3961 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
414c69f7 | 3962 | ecs->event_thread->stop_step = 1; |
488f131b JB |
3963 | print_stop_reason (END_STEPPING_RANGE, 0); |
3964 | stop_stepping (ecs); | |
3965 | return; | |
3966 | } | |
c906108c | 3967 | |
488f131b | 3968 | /* We aren't done stepping. |
c906108c | 3969 | |
488f131b JB |
3970 | Optimize by setting the stepping range to the line. |
3971 | (We might not be in the original line, but if we entered a | |
3972 | new line in mid-statement, we continue stepping. This makes | |
3973 | things like for(;;) statements work better.) */ | |
c906108c | 3974 | |
4e1c45ea PA |
3975 | ecs->event_thread->step_range_start = stop_pc_sal.pc; |
3976 | ecs->event_thread->step_range_end = stop_pc_sal.end; | |
3977 | ecs->event_thread->step_frame_id = get_frame_id (get_current_frame ()); | |
3978 | ecs->event_thread->current_line = stop_pc_sal.line; | |
3979 | ecs->event_thread->current_symtab = stop_pc_sal.symtab; | |
488f131b | 3980 | |
527159b7 | 3981 | if (debug_infrun) |
8a9de0e4 | 3982 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 3983 | keep_going (ecs); |
104c1213 JM |
3984 | } |
3985 | ||
b3444185 | 3986 | /* Is thread TP in the middle of single-stepping? */ |
104c1213 | 3987 | |
a7212384 | 3988 | static int |
b3444185 | 3989 | currently_stepping (struct thread_info *tp) |
a7212384 | 3990 | { |
b3444185 PA |
3991 | return ((tp->step_range_end && tp->step_resume_breakpoint == NULL) |
3992 | || tp->trap_expected | |
3993 | || tp->stepping_through_solib_after_catch | |
3994 | || bpstat_should_step ()); | |
a7212384 UW |
3995 | } |
3996 | ||
b3444185 PA |
3997 | /* Returns true if any thread *but* the one passed in "data" is in the |
3998 | middle of stepping or of handling a "next". */ | |
a7212384 | 3999 | |
104c1213 | 4000 | static int |
b3444185 | 4001 | currently_stepping_or_nexting_callback (struct thread_info *tp, void *data) |
104c1213 | 4002 | { |
b3444185 PA |
4003 | if (tp == data) |
4004 | return 0; | |
4005 | ||
4006 | return (tp->step_range_end | |
4007 | || tp->trap_expected | |
4008 | || tp->stepping_through_solib_after_catch); | |
104c1213 | 4009 | } |
c906108c | 4010 | |
b2175913 MS |
4011 | /* Inferior has stepped into a subroutine call with source code that |
4012 | we should not step over. Do step to the first line of code in | |
4013 | it. */ | |
c2c6d25f JM |
4014 | |
4015 | static void | |
b2175913 | 4016 | handle_step_into_function (struct execution_control_state *ecs) |
c2c6d25f JM |
4017 | { |
4018 | struct symtab *s; | |
2afb61aa | 4019 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f JM |
4020 | |
4021 | s = find_pc_symtab (stop_pc); | |
4022 | if (s && s->language != language_asm) | |
b2175913 MS |
4023 | ecs->stop_func_start = gdbarch_skip_prologue (current_gdbarch, |
4024 | ecs->stop_func_start); | |
c2c6d25f | 4025 | |
2afb61aa | 4026 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
4027 | /* Use the step_resume_break to step until the end of the prologue, |
4028 | even if that involves jumps (as it seems to on the vax under | |
4029 | 4.2). */ | |
4030 | /* If the prologue ends in the middle of a source line, continue to | |
4031 | the end of that source line (if it is still within the function). | |
4032 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
4033 | if (stop_func_sal.end |
4034 | && stop_func_sal.pc != ecs->stop_func_start | |
4035 | && stop_func_sal.end < ecs->stop_func_end) | |
4036 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 4037 | |
2dbd5e30 KB |
4038 | /* Architectures which require breakpoint adjustment might not be able |
4039 | to place a breakpoint at the computed address. If so, the test | |
4040 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
4041 | ecs->stop_func_start to an address at which a breakpoint may be | |
4042 | legitimately placed. | |
8fb3e588 | 4043 | |
2dbd5e30 KB |
4044 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
4045 | made, GDB will enter an infinite loop when stepping through | |
4046 | optimized code consisting of VLIW instructions which contain | |
4047 | subinstructions corresponding to different source lines. On | |
4048 | FR-V, it's not permitted to place a breakpoint on any but the | |
4049 | first subinstruction of a VLIW instruction. When a breakpoint is | |
4050 | set, GDB will adjust the breakpoint address to the beginning of | |
4051 | the VLIW instruction. Thus, we need to make the corresponding | |
4052 | adjustment here when computing the stop address. */ | |
8fb3e588 | 4053 | |
2dbd5e30 KB |
4054 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
4055 | { | |
4056 | ecs->stop_func_start | |
4057 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
8fb3e588 | 4058 | ecs->stop_func_start); |
2dbd5e30 KB |
4059 | } |
4060 | ||
c2c6d25f JM |
4061 | if (ecs->stop_func_start == stop_pc) |
4062 | { | |
4063 | /* We are already there: stop now. */ | |
414c69f7 | 4064 | ecs->event_thread->stop_step = 1; |
488f131b | 4065 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
4066 | stop_stepping (ecs); |
4067 | return; | |
4068 | } | |
4069 | else | |
4070 | { | |
4071 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 4072 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
4073 | sr_sal.pc = ecs->stop_func_start; |
4074 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
44cbf7b5 | 4075 | |
c2c6d25f | 4076 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
4077 | some machines the prologue is where the new fp value is |
4078 | established. */ | |
44cbf7b5 | 4079 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c2c6d25f JM |
4080 | |
4081 | /* And make sure stepping stops right away then. */ | |
4e1c45ea | 4082 | ecs->event_thread->step_range_end = ecs->event_thread->step_range_start; |
c2c6d25f JM |
4083 | } |
4084 | keep_going (ecs); | |
4085 | } | |
d4f3574e | 4086 | |
b2175913 MS |
4087 | /* Inferior has stepped backward into a subroutine call with source |
4088 | code that we should not step over. Do step to the beginning of the | |
4089 | last line of code in it. */ | |
4090 | ||
4091 | static void | |
4092 | handle_step_into_function_backward (struct execution_control_state *ecs) | |
4093 | { | |
4094 | struct symtab *s; | |
4095 | struct symtab_and_line stop_func_sal, sr_sal; | |
4096 | ||
4097 | s = find_pc_symtab (stop_pc); | |
4098 | if (s && s->language != language_asm) | |
4099 | ecs->stop_func_start = gdbarch_skip_prologue (current_gdbarch, | |
4100 | ecs->stop_func_start); | |
4101 | ||
4102 | stop_func_sal = find_pc_line (stop_pc, 0); | |
4103 | ||
4104 | /* OK, we're just going to keep stepping here. */ | |
4105 | if (stop_func_sal.pc == stop_pc) | |
4106 | { | |
4107 | /* We're there already. Just stop stepping now. */ | |
4108 | ecs->event_thread->stop_step = 1; | |
4109 | print_stop_reason (END_STEPPING_RANGE, 0); | |
4110 | stop_stepping (ecs); | |
4111 | } | |
4112 | else | |
4113 | { | |
4114 | /* Else just reset the step range and keep going. | |
4115 | No step-resume breakpoint, they don't work for | |
4116 | epilogues, which can have multiple entry paths. */ | |
4117 | ecs->event_thread->step_range_start = stop_func_sal.pc; | |
4118 | ecs->event_thread->step_range_end = stop_func_sal.end; | |
4119 | keep_going (ecs); | |
4120 | } | |
4121 | return; | |
4122 | } | |
4123 | ||
d3169d93 | 4124 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
4125 | This is used to both functions and to skip over code. */ |
4126 | ||
4127 | static void | |
4128 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
4129 | struct frame_id sr_id) | |
4130 | { | |
611c83ae PA |
4131 | /* There should never be more than one step-resume or longjmp-resume |
4132 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 4133 | step_resume_breakpoint when one is already active. */ |
4e1c45ea | 4134 | gdb_assert (inferior_thread ()->step_resume_breakpoint == NULL); |
d3169d93 DJ |
4135 | |
4136 | if (debug_infrun) | |
4137 | fprintf_unfiltered (gdb_stdlog, | |
4138 | "infrun: inserting step-resume breakpoint at 0x%s\n", | |
4139 | paddr_nz (sr_sal.pc)); | |
4140 | ||
4e1c45ea PA |
4141 | inferior_thread ()->step_resume_breakpoint |
4142 | = set_momentary_breakpoint (sr_sal, sr_id, bp_step_resume); | |
44cbf7b5 | 4143 | } |
7ce450bd | 4144 | |
d3169d93 | 4145 | /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used |
14e60db5 | 4146 | to skip a potential signal handler. |
7ce450bd | 4147 | |
14e60db5 DJ |
4148 | This is called with the interrupted function's frame. The signal |
4149 | handler, when it returns, will resume the interrupted function at | |
4150 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
4151 | |
4152 | static void | |
44cbf7b5 | 4153 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
4154 | { |
4155 | struct symtab_and_line sr_sal; | |
4156 | ||
f4c1edd8 | 4157 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
4158 | init_sal (&sr_sal); /* initialize to zeros */ |
4159 | ||
bf6ae464 UW |
4160 | sr_sal.pc = gdbarch_addr_bits_remove |
4161 | (current_gdbarch, get_frame_pc (return_frame)); | |
d303a6c7 AC |
4162 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
4163 | ||
44cbf7b5 | 4164 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
d303a6c7 AC |
4165 | } |
4166 | ||
14e60db5 DJ |
4167 | /* Similar to insert_step_resume_breakpoint_at_frame, except |
4168 | but a breakpoint at the previous frame's PC. This is used to | |
4169 | skip a function after stepping into it (for "next" or if the called | |
4170 | function has no debugging information). | |
4171 | ||
4172 | The current function has almost always been reached by single | |
4173 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
4174 | current function, and the breakpoint will be set at the caller's | |
4175 | resume address. | |
4176 | ||
4177 | This is a separate function rather than reusing | |
4178 | insert_step_resume_breakpoint_at_frame in order to avoid | |
4179 | get_prev_frame, which may stop prematurely (see the implementation | |
eb2f4a08 | 4180 | of frame_unwind_id for an example). */ |
14e60db5 DJ |
4181 | |
4182 | static void | |
4183 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
4184 | { | |
4185 | struct symtab_and_line sr_sal; | |
4186 | ||
4187 | /* We shouldn't have gotten here if we don't know where the call site | |
4188 | is. */ | |
eb2f4a08 | 4189 | gdb_assert (frame_id_p (frame_unwind_id (next_frame))); |
14e60db5 DJ |
4190 | |
4191 | init_sal (&sr_sal); /* initialize to zeros */ | |
4192 | ||
bf6ae464 | 4193 | sr_sal.pc = gdbarch_addr_bits_remove |
eb2f4a08 | 4194 | (current_gdbarch, frame_pc_unwind (next_frame)); |
14e60db5 DJ |
4195 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
4196 | ||
eb2f4a08 | 4197 | insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame)); |
14e60db5 DJ |
4198 | } |
4199 | ||
611c83ae PA |
4200 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
4201 | new breakpoint at the target of a jmp_buf. The handling of | |
4202 | longjmp-resume uses the same mechanisms used for handling | |
4203 | "step-resume" breakpoints. */ | |
4204 | ||
4205 | static void | |
4206 | insert_longjmp_resume_breakpoint (CORE_ADDR pc) | |
4207 | { | |
4208 | /* There should never be more than one step-resume or longjmp-resume | |
4209 | breakpoint per thread, so we should never be setting a new | |
4210 | longjmp_resume_breakpoint when one is already active. */ | |
4e1c45ea | 4211 | gdb_assert (inferior_thread ()->step_resume_breakpoint == NULL); |
611c83ae PA |
4212 | |
4213 | if (debug_infrun) | |
4214 | fprintf_unfiltered (gdb_stdlog, | |
4215 | "infrun: inserting longjmp-resume breakpoint at 0x%s\n", | |
4216 | paddr_nz (pc)); | |
4217 | ||
4e1c45ea | 4218 | inferior_thread ()->step_resume_breakpoint = |
611c83ae PA |
4219 | set_momentary_breakpoint_at_pc (pc, bp_longjmp_resume); |
4220 | } | |
4221 | ||
104c1213 JM |
4222 | static void |
4223 | stop_stepping (struct execution_control_state *ecs) | |
4224 | { | |
527159b7 | 4225 | if (debug_infrun) |
8a9de0e4 | 4226 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 4227 | |
cd0fc7c3 SS |
4228 | /* Let callers know we don't want to wait for the inferior anymore. */ |
4229 | ecs->wait_some_more = 0; | |
4230 | } | |
4231 | ||
d4f3574e SS |
4232 | /* This function handles various cases where we need to continue |
4233 | waiting for the inferior. */ | |
4234 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
4235 | ||
4236 | static void | |
4237 | keep_going (struct execution_control_state *ecs) | |
4238 | { | |
d4f3574e | 4239 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
4240 | ecs->event_thread->prev_pc |
4241 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 4242 | |
d4f3574e SS |
4243 | /* If we did not do break;, it means we should keep running the |
4244 | inferior and not return to debugger. */ | |
4245 | ||
2020b7ab PA |
4246 | if (ecs->event_thread->trap_expected |
4247 | && ecs->event_thread->stop_signal != TARGET_SIGNAL_TRAP) | |
d4f3574e SS |
4248 | { |
4249 | /* We took a signal (which we are supposed to pass through to | |
4e1c45ea PA |
4250 | the inferior, else we'd not get here) and we haven't yet |
4251 | gotten our trap. Simply continue. */ | |
2020b7ab PA |
4252 | resume (currently_stepping (ecs->event_thread), |
4253 | ecs->event_thread->stop_signal); | |
d4f3574e SS |
4254 | } |
4255 | else | |
4256 | { | |
4257 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
4258 | anyway (the user asked that this signal be passed to the |
4259 | child) | |
4260 | -- or -- | |
4261 | The signal was SIGTRAP, e.g. it was our signal, but we | |
4262 | decided we should resume from it. | |
d4f3574e | 4263 | |
c36b740a | 4264 | We're going to run this baby now! |
d4f3574e | 4265 | |
c36b740a VP |
4266 | Note that insert_breakpoints won't try to re-insert |
4267 | already inserted breakpoints. Therefore, we don't | |
4268 | care if breakpoints were already inserted, or not. */ | |
4269 | ||
4e1c45ea | 4270 | if (ecs->event_thread->stepping_over_breakpoint) |
45e8c884 | 4271 | { |
237fc4c9 PA |
4272 | if (! use_displaced_stepping (current_gdbarch)) |
4273 | /* Since we can't do a displaced step, we have to remove | |
4274 | the breakpoint while we step it. To keep things | |
4275 | simple, we remove them all. */ | |
4276 | remove_breakpoints (); | |
45e8c884 VP |
4277 | } |
4278 | else | |
d4f3574e | 4279 | { |
e236ba44 | 4280 | struct gdb_exception e; |
569631c6 UW |
4281 | /* Stop stepping when inserting breakpoints |
4282 | has failed. */ | |
e236ba44 VP |
4283 | TRY_CATCH (e, RETURN_MASK_ERROR) |
4284 | { | |
4285 | insert_breakpoints (); | |
4286 | } | |
4287 | if (e.reason < 0) | |
d4f3574e SS |
4288 | { |
4289 | stop_stepping (ecs); | |
4290 | return; | |
4291 | } | |
d4f3574e SS |
4292 | } |
4293 | ||
4e1c45ea | 4294 | ecs->event_thread->trap_expected = ecs->event_thread->stepping_over_breakpoint; |
d4f3574e SS |
4295 | |
4296 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
4297 | specifies that such a signal should be delivered to the |
4298 | target program). | |
4299 | ||
4300 | Typically, this would occure when a user is debugging a | |
4301 | target monitor on a simulator: the target monitor sets a | |
4302 | breakpoint; the simulator encounters this break-point and | |
4303 | halts the simulation handing control to GDB; GDB, noteing | |
4304 | that the break-point isn't valid, returns control back to the | |
4305 | simulator; the simulator then delivers the hardware | |
4306 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
4307 | ||
2020b7ab PA |
4308 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
4309 | && !signal_program[ecs->event_thread->stop_signal]) | |
4310 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
d4f3574e | 4311 | |
2020b7ab PA |
4312 | resume (currently_stepping (ecs->event_thread), |
4313 | ecs->event_thread->stop_signal); | |
d4f3574e SS |
4314 | } |
4315 | ||
488f131b | 4316 | prepare_to_wait (ecs); |
d4f3574e SS |
4317 | } |
4318 | ||
104c1213 JM |
4319 | /* This function normally comes after a resume, before |
4320 | handle_inferior_event exits. It takes care of any last bits of | |
4321 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 4322 | |
104c1213 JM |
4323 | static void |
4324 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 4325 | { |
527159b7 | 4326 | if (debug_infrun) |
8a9de0e4 | 4327 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
0d1e5fa7 | 4328 | if (infwait_state == infwait_normal_state) |
104c1213 JM |
4329 | { |
4330 | overlay_cache_invalid = 1; | |
4331 | ||
4332 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
4333 | target_wait because they can be loaded from the target while |
4334 | in target_wait. This makes remote debugging a bit more | |
4335 | efficient for those targets that provide critical registers | |
4336 | as part of their normal status mechanism. */ | |
104c1213 JM |
4337 | |
4338 | registers_changed (); | |
0d1e5fa7 | 4339 | waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
4340 | } |
4341 | /* This is the old end of the while loop. Let everybody know we | |
4342 | want to wait for the inferior some more and get called again | |
4343 | soon. */ | |
4344 | ecs->wait_some_more = 1; | |
c906108c | 4345 | } |
11cf8741 JM |
4346 | |
4347 | /* Print why the inferior has stopped. We always print something when | |
4348 | the inferior exits, or receives a signal. The rest of the cases are | |
4349 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
4350 | there should be a call to this function from handle_inferior_event() | |
4351 | each time stop_stepping() is called.*/ | |
4352 | static void | |
4353 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
4354 | { | |
4355 | switch (stop_reason) | |
4356 | { | |
11cf8741 JM |
4357 | case END_STEPPING_RANGE: |
4358 | /* We are done with a step/next/si/ni command. */ | |
4359 | /* For now print nothing. */ | |
fb40c209 | 4360 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 4361 | operation for n > 1 */ |
414c69f7 PA |
4362 | if (!inferior_thread ()->step_multi |
4363 | || !inferior_thread ()->stop_step) | |
9dc5e2a9 | 4364 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
4365 | ui_out_field_string |
4366 | (uiout, "reason", | |
4367 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
11cf8741 | 4368 | break; |
11cf8741 JM |
4369 | case SIGNAL_EXITED: |
4370 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 4371 | annotate_signalled (); |
9dc5e2a9 | 4372 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
4373 | ui_out_field_string |
4374 | (uiout, "reason", | |
4375 | async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8b93c638 JM |
4376 | ui_out_text (uiout, "\nProgram terminated with signal "); |
4377 | annotate_signal_name (); | |
488f131b JB |
4378 | ui_out_field_string (uiout, "signal-name", |
4379 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
4380 | annotate_signal_name_end (); |
4381 | ui_out_text (uiout, ", "); | |
4382 | annotate_signal_string (); | |
488f131b JB |
4383 | ui_out_field_string (uiout, "signal-meaning", |
4384 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
4385 | annotate_signal_string_end (); |
4386 | ui_out_text (uiout, ".\n"); | |
4387 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
4388 | break; |
4389 | case EXITED: | |
4390 | /* The inferior program is finished. */ | |
8b93c638 JM |
4391 | annotate_exited (stop_info); |
4392 | if (stop_info) | |
4393 | { | |
9dc5e2a9 | 4394 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
4395 | ui_out_field_string (uiout, "reason", |
4396 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
8b93c638 | 4397 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
4398 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
4399 | (unsigned int) stop_info); | |
8b93c638 JM |
4400 | ui_out_text (uiout, ".\n"); |
4401 | } | |
4402 | else | |
4403 | { | |
9dc5e2a9 | 4404 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
4405 | ui_out_field_string |
4406 | (uiout, "reason", | |
4407 | async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
8b93c638 JM |
4408 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
4409 | } | |
f17517ea AS |
4410 | /* Support the --return-child-result option. */ |
4411 | return_child_result_value = stop_info; | |
11cf8741 JM |
4412 | break; |
4413 | case SIGNAL_RECEIVED: | |
252fbfc8 PA |
4414 | /* Signal received. The signal table tells us to print about |
4415 | it. */ | |
8b93c638 | 4416 | annotate_signal (); |
252fbfc8 PA |
4417 | |
4418 | if (stop_info == TARGET_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) | |
4419 | { | |
4420 | struct thread_info *t = inferior_thread (); | |
4421 | ||
4422 | ui_out_text (uiout, "\n["); | |
4423 | ui_out_field_string (uiout, "thread-name", | |
4424 | target_pid_to_str (t->ptid)); | |
4425 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
4426 | ui_out_text (uiout, " stopped"); | |
4427 | } | |
4428 | else | |
4429 | { | |
4430 | ui_out_text (uiout, "\nProgram received signal "); | |
4431 | annotate_signal_name (); | |
4432 | if (ui_out_is_mi_like_p (uiout)) | |
4433 | ui_out_field_string | |
4434 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
4435 | ui_out_field_string (uiout, "signal-name", | |
4436 | target_signal_to_name (stop_info)); | |
4437 | annotate_signal_name_end (); | |
4438 | ui_out_text (uiout, ", "); | |
4439 | annotate_signal_string (); | |
4440 | ui_out_field_string (uiout, "signal-meaning", | |
4441 | target_signal_to_string (stop_info)); | |
4442 | annotate_signal_string_end (); | |
4443 | } | |
8b93c638 | 4444 | ui_out_text (uiout, ".\n"); |
11cf8741 | 4445 | break; |
b2175913 MS |
4446 | case NO_HISTORY: |
4447 | /* Reverse execution: target ran out of history info. */ | |
4448 | ui_out_text (uiout, "\nNo more reverse-execution history.\n"); | |
4449 | break; | |
11cf8741 | 4450 | default: |
8e65ff28 | 4451 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 4452 | _("print_stop_reason: unrecognized enum value")); |
11cf8741 JM |
4453 | break; |
4454 | } | |
4455 | } | |
c906108c | 4456 | \f |
43ff13b4 | 4457 | |
c906108c SS |
4458 | /* Here to return control to GDB when the inferior stops for real. |
4459 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
4460 | ||
4461 | STOP_PRINT_FRAME nonzero means print the executing frame | |
4462 | (pc, function, args, file, line number and line text). | |
4463 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
4464 | attempting to insert breakpoints. */ | |
4465 | ||
4466 | void | |
96baa820 | 4467 | normal_stop (void) |
c906108c | 4468 | { |
73b65bb0 DJ |
4469 | struct target_waitstatus last; |
4470 | ptid_t last_ptid; | |
29f49a6a | 4471 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
73b65bb0 DJ |
4472 | |
4473 | get_last_target_status (&last_ptid, &last); | |
4474 | ||
29f49a6a PA |
4475 | /* If an exception is thrown from this point on, make sure to |
4476 | propagate GDB's knowledge of the executing state to the | |
4477 | frontend/user running state. A QUIT is an easy exception to see | |
4478 | here, so do this before any filtered output. */ | |
c35b1492 PA |
4479 | if (!non_stop) |
4480 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
4481 | else if (last.kind != TARGET_WAITKIND_SIGNALLED | |
4482 | && last.kind != TARGET_WAITKIND_EXITED) | |
4483 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); | |
29f49a6a | 4484 | |
4f8d22e3 PA |
4485 | /* In non-stop mode, we don't want GDB to switch threads behind the |
4486 | user's back, to avoid races where the user is typing a command to | |
4487 | apply to thread x, but GDB switches to thread y before the user | |
4488 | finishes entering the command. */ | |
4489 | ||
c906108c SS |
4490 | /* As with the notification of thread events, we want to delay |
4491 | notifying the user that we've switched thread context until | |
4492 | the inferior actually stops. | |
4493 | ||
73b65bb0 DJ |
4494 | There's no point in saying anything if the inferior has exited. |
4495 | Note that SIGNALLED here means "exited with a signal", not | |
4496 | "received a signal". */ | |
4f8d22e3 PA |
4497 | if (!non_stop |
4498 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
4499 | && target_has_execution |
4500 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
4501 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
4502 | { |
4503 | target_terminal_ours_for_output (); | |
a3f17187 | 4504 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 4505 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 4506 | annotate_thread_changed (); |
39f77062 | 4507 | previous_inferior_ptid = inferior_ptid; |
c906108c | 4508 | } |
c906108c | 4509 | |
74960c60 | 4510 | if (!breakpoints_always_inserted_mode () && target_has_execution) |
c906108c SS |
4511 | { |
4512 | if (remove_breakpoints ()) | |
4513 | { | |
4514 | target_terminal_ours_for_output (); | |
a3f17187 AC |
4515 | printf_filtered (_("\ |
4516 | Cannot remove breakpoints because program is no longer writable.\n\ | |
a3f17187 | 4517 | Further execution is probably impossible.\n")); |
c906108c SS |
4518 | } |
4519 | } | |
c906108c | 4520 | |
c906108c SS |
4521 | /* If an auto-display called a function and that got a signal, |
4522 | delete that auto-display to avoid an infinite recursion. */ | |
4523 | ||
4524 | if (stopped_by_random_signal) | |
4525 | disable_current_display (); | |
4526 | ||
4527 | /* Don't print a message if in the middle of doing a "step n" | |
4528 | operation for n > 1 */ | |
af679fd0 PA |
4529 | if (target_has_execution |
4530 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
4531 | && last.kind != TARGET_WAITKIND_EXITED | |
4532 | && inferior_thread ()->step_multi | |
414c69f7 | 4533 | && inferior_thread ()->stop_step) |
c906108c SS |
4534 | goto done; |
4535 | ||
4536 | target_terminal_ours (); | |
4537 | ||
7abfe014 DJ |
4538 | /* Set the current source location. This will also happen if we |
4539 | display the frame below, but the current SAL will be incorrect | |
4540 | during a user hook-stop function. */ | |
d729566a | 4541 | if (has_stack_frames () && !stop_stack_dummy) |
7abfe014 DJ |
4542 | set_current_sal_from_frame (get_current_frame (), 1); |
4543 | ||
dd7e2d2b PA |
4544 | /* Let the user/frontend see the threads as stopped. */ |
4545 | do_cleanups (old_chain); | |
4546 | ||
4547 | /* Look up the hook_stop and run it (CLI internally handles problem | |
4548 | of stop_command's pre-hook not existing). */ | |
4549 | if (stop_command) | |
4550 | catch_errors (hook_stop_stub, stop_command, | |
4551 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
4552 | ||
d729566a | 4553 | if (!has_stack_frames ()) |
d51fd4c8 | 4554 | goto done; |
c906108c | 4555 | |
32400beb PA |
4556 | if (last.kind == TARGET_WAITKIND_SIGNALLED |
4557 | || last.kind == TARGET_WAITKIND_EXITED) | |
4558 | goto done; | |
4559 | ||
c906108c SS |
4560 | /* Select innermost stack frame - i.e., current frame is frame 0, |
4561 | and current location is based on that. | |
4562 | Don't do this on return from a stack dummy routine, | |
4563 | or if the program has exited. */ | |
4564 | ||
4565 | if (!stop_stack_dummy) | |
4566 | { | |
0f7d239c | 4567 | select_frame (get_current_frame ()); |
c906108c SS |
4568 | |
4569 | /* Print current location without a level number, if | |
c5aa993b JM |
4570 | we have changed functions or hit a breakpoint. |
4571 | Print source line if we have one. | |
4572 | bpstat_print() contains the logic deciding in detail | |
4573 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 4574 | |
d01a8610 AS |
4575 | /* If --batch-silent is enabled then there's no need to print the current |
4576 | source location, and to try risks causing an error message about | |
4577 | missing source files. */ | |
4578 | if (stop_print_frame && !batch_silent) | |
c906108c SS |
4579 | { |
4580 | int bpstat_ret; | |
4581 | int source_flag; | |
917317f4 | 4582 | int do_frame_printing = 1; |
347bddb7 | 4583 | struct thread_info *tp = inferior_thread (); |
c906108c | 4584 | |
347bddb7 | 4585 | bpstat_ret = bpstat_print (tp->stop_bpstat); |
917317f4 JM |
4586 | switch (bpstat_ret) |
4587 | { | |
4588 | case PRINT_UNKNOWN: | |
b0f4b84b DJ |
4589 | /* If we had hit a shared library event breakpoint, |
4590 | bpstat_print would print out this message. If we hit | |
4591 | an OS-level shared library event, do the same | |
4592 | thing. */ | |
4593 | if (last.kind == TARGET_WAITKIND_LOADED) | |
4594 | { | |
4595 | printf_filtered (_("Stopped due to shared library event\n")); | |
4596 | source_flag = SRC_LINE; /* something bogus */ | |
4597 | do_frame_printing = 0; | |
4598 | break; | |
4599 | } | |
4600 | ||
aa0cd9c1 | 4601 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
4602 | (or should) carry around the function and does (or |
4603 | should) use that when doing a frame comparison. */ | |
414c69f7 | 4604 | if (tp->stop_step |
347bddb7 | 4605 | && frame_id_eq (tp->step_frame_id, |
aa0cd9c1 | 4606 | get_frame_id (get_current_frame ())) |
917317f4 | 4607 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 4608 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 4609 | else |
488f131b | 4610 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
4611 | break; |
4612 | case PRINT_SRC_AND_LOC: | |
488f131b | 4613 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
4614 | break; |
4615 | case PRINT_SRC_ONLY: | |
c5394b80 | 4616 | source_flag = SRC_LINE; |
917317f4 JM |
4617 | break; |
4618 | case PRINT_NOTHING: | |
488f131b | 4619 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
4620 | do_frame_printing = 0; |
4621 | break; | |
4622 | default: | |
e2e0b3e5 | 4623 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 4624 | } |
c906108c SS |
4625 | |
4626 | /* The behavior of this routine with respect to the source | |
4627 | flag is: | |
c5394b80 JM |
4628 | SRC_LINE: Print only source line |
4629 | LOCATION: Print only location | |
4630 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 4631 | if (do_frame_printing) |
b04f3ab4 | 4632 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
4633 | |
4634 | /* Display the auto-display expressions. */ | |
4635 | do_displays (); | |
4636 | } | |
4637 | } | |
4638 | ||
4639 | /* Save the function value return registers, if we care. | |
4640 | We might be about to restore their previous contents. */ | |
32400beb | 4641 | if (inferior_thread ()->proceed_to_finish) |
d5c31457 UW |
4642 | { |
4643 | /* This should not be necessary. */ | |
4644 | if (stop_registers) | |
4645 | regcache_xfree (stop_registers); | |
4646 | ||
4647 | /* NB: The copy goes through to the target picking up the value of | |
4648 | all the registers. */ | |
4649 | stop_registers = regcache_dup (get_current_regcache ()); | |
4650 | } | |
c906108c SS |
4651 | |
4652 | if (stop_stack_dummy) | |
4653 | { | |
b89667eb DE |
4654 | /* Pop the empty frame that contains the stack dummy. |
4655 | This also restores inferior state prior to the call | |
4656 | (struct inferior_thread_state). */ | |
4657 | struct frame_info *frame = get_current_frame (); | |
4658 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
4659 | frame_pop (frame); | |
4660 | /* frame_pop() calls reinit_frame_cache as the last thing it does | |
4661 | which means there's currently no selected frame. We don't need | |
4662 | to re-establish a selected frame if the dummy call returns normally, | |
4663 | that will be done by restore_inferior_status. However, we do have | |
4664 | to handle the case where the dummy call is returning after being | |
4665 | stopped (e.g. the dummy call previously hit a breakpoint). We | |
4666 | can't know which case we have so just always re-establish a | |
4667 | selected frame here. */ | |
0f7d239c | 4668 | select_frame (get_current_frame ()); |
c906108c SS |
4669 | } |
4670 | ||
c906108c SS |
4671 | done: |
4672 | annotate_stopped (); | |
41d2bdb4 PA |
4673 | |
4674 | /* Suppress the stop observer if we're in the middle of: | |
4675 | ||
4676 | - a step n (n > 1), as there still more steps to be done. | |
4677 | ||
4678 | - a "finish" command, as the observer will be called in | |
4679 | finish_command_continuation, so it can include the inferior | |
4680 | function's return value. | |
4681 | ||
4682 | - calling an inferior function, as we pretend we inferior didn't | |
4683 | run at all. The return value of the call is handled by the | |
4684 | expression evaluator, through call_function_by_hand. */ | |
4685 | ||
4686 | if (!target_has_execution | |
4687 | || last.kind == TARGET_WAITKIND_SIGNALLED | |
4688 | || last.kind == TARGET_WAITKIND_EXITED | |
4689 | || (!inferior_thread ()->step_multi | |
4690 | && !(inferior_thread ()->stop_bpstat | |
c5a4d20b PA |
4691 | && inferior_thread ()->proceed_to_finish) |
4692 | && !inferior_thread ()->in_infcall)) | |
347bddb7 PA |
4693 | { |
4694 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
1d33d6ba VP |
4695 | observer_notify_normal_stop (inferior_thread ()->stop_bpstat, |
4696 | stop_print_frame); | |
347bddb7 | 4697 | else |
1d33d6ba | 4698 | observer_notify_normal_stop (NULL, stop_print_frame); |
347bddb7 | 4699 | } |
347bddb7 | 4700 | |
48844aa6 PA |
4701 | if (target_has_execution) |
4702 | { | |
4703 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
4704 | && last.kind != TARGET_WAITKIND_EXITED) | |
4705 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
4706 | Delete any breakpoint that is to be deleted at the next stop. */ | |
4707 | breakpoint_auto_delete (inferior_thread ()->stop_bpstat); | |
94cc34af | 4708 | } |
c906108c SS |
4709 | } |
4710 | ||
4711 | static int | |
96baa820 | 4712 | hook_stop_stub (void *cmd) |
c906108c | 4713 | { |
5913bcb0 | 4714 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
4715 | return (0); |
4716 | } | |
4717 | \f | |
c5aa993b | 4718 | int |
96baa820 | 4719 | signal_stop_state (int signo) |
c906108c | 4720 | { |
d6b48e9c | 4721 | return signal_stop[signo]; |
c906108c SS |
4722 | } |
4723 | ||
c5aa993b | 4724 | int |
96baa820 | 4725 | signal_print_state (int signo) |
c906108c SS |
4726 | { |
4727 | return signal_print[signo]; | |
4728 | } | |
4729 | ||
c5aa993b | 4730 | int |
96baa820 | 4731 | signal_pass_state (int signo) |
c906108c SS |
4732 | { |
4733 | return signal_program[signo]; | |
4734 | } | |
4735 | ||
488f131b | 4736 | int |
7bda5e4a | 4737 | signal_stop_update (int signo, int state) |
d4f3574e SS |
4738 | { |
4739 | int ret = signal_stop[signo]; | |
4740 | signal_stop[signo] = state; | |
4741 | return ret; | |
4742 | } | |
4743 | ||
488f131b | 4744 | int |
7bda5e4a | 4745 | signal_print_update (int signo, int state) |
d4f3574e SS |
4746 | { |
4747 | int ret = signal_print[signo]; | |
4748 | signal_print[signo] = state; | |
4749 | return ret; | |
4750 | } | |
4751 | ||
488f131b | 4752 | int |
7bda5e4a | 4753 | signal_pass_update (int signo, int state) |
d4f3574e SS |
4754 | { |
4755 | int ret = signal_program[signo]; | |
4756 | signal_program[signo] = state; | |
4757 | return ret; | |
4758 | } | |
4759 | ||
c906108c | 4760 | static void |
96baa820 | 4761 | sig_print_header (void) |
c906108c | 4762 | { |
a3f17187 AC |
4763 | printf_filtered (_("\ |
4764 | Signal Stop\tPrint\tPass to program\tDescription\n")); | |
c906108c SS |
4765 | } |
4766 | ||
4767 | static void | |
96baa820 | 4768 | sig_print_info (enum target_signal oursig) |
c906108c | 4769 | { |
54363045 | 4770 | const char *name = target_signal_to_name (oursig); |
c906108c | 4771 | int name_padding = 13 - strlen (name); |
96baa820 | 4772 | |
c906108c SS |
4773 | if (name_padding <= 0) |
4774 | name_padding = 0; | |
4775 | ||
4776 | printf_filtered ("%s", name); | |
488f131b | 4777 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
4778 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
4779 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
4780 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
4781 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
4782 | } | |
4783 | ||
4784 | /* Specify how various signals in the inferior should be handled. */ | |
4785 | ||
4786 | static void | |
96baa820 | 4787 | handle_command (char *args, int from_tty) |
c906108c SS |
4788 | { |
4789 | char **argv; | |
4790 | int digits, wordlen; | |
4791 | int sigfirst, signum, siglast; | |
4792 | enum target_signal oursig; | |
4793 | int allsigs; | |
4794 | int nsigs; | |
4795 | unsigned char *sigs; | |
4796 | struct cleanup *old_chain; | |
4797 | ||
4798 | if (args == NULL) | |
4799 | { | |
e2e0b3e5 | 4800 | error_no_arg (_("signal to handle")); |
c906108c SS |
4801 | } |
4802 | ||
4803 | /* Allocate and zero an array of flags for which signals to handle. */ | |
4804 | ||
4805 | nsigs = (int) TARGET_SIGNAL_LAST; | |
4806 | sigs = (unsigned char *) alloca (nsigs); | |
4807 | memset (sigs, 0, nsigs); | |
4808 | ||
4809 | /* Break the command line up into args. */ | |
4810 | ||
d1a41061 | 4811 | argv = gdb_buildargv (args); |
7a292a7a | 4812 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
4813 | |
4814 | /* Walk through the args, looking for signal oursigs, signal names, and | |
4815 | actions. Signal numbers and signal names may be interspersed with | |
4816 | actions, with the actions being performed for all signals cumulatively | |
4817 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
4818 | ||
4819 | while (*argv != NULL) | |
4820 | { | |
4821 | wordlen = strlen (*argv); | |
4822 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
4823 | {; | |
4824 | } | |
4825 | allsigs = 0; | |
4826 | sigfirst = siglast = -1; | |
4827 | ||
4828 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
4829 | { | |
4830 | /* Apply action to all signals except those used by the | |
4831 | debugger. Silently skip those. */ | |
4832 | allsigs = 1; | |
4833 | sigfirst = 0; | |
4834 | siglast = nsigs - 1; | |
4835 | } | |
4836 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
4837 | { | |
4838 | SET_SIGS (nsigs, sigs, signal_stop); | |
4839 | SET_SIGS (nsigs, sigs, signal_print); | |
4840 | } | |
4841 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
4842 | { | |
4843 | UNSET_SIGS (nsigs, sigs, signal_program); | |
4844 | } | |
4845 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
4846 | { | |
4847 | SET_SIGS (nsigs, sigs, signal_print); | |
4848 | } | |
4849 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
4850 | { | |
4851 | SET_SIGS (nsigs, sigs, signal_program); | |
4852 | } | |
4853 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
4854 | { | |
4855 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
4856 | } | |
4857 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
4858 | { | |
4859 | SET_SIGS (nsigs, sigs, signal_program); | |
4860 | } | |
4861 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
4862 | { | |
4863 | UNSET_SIGS (nsigs, sigs, signal_print); | |
4864 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
4865 | } | |
4866 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
4867 | { | |
4868 | UNSET_SIGS (nsigs, sigs, signal_program); | |
4869 | } | |
4870 | else if (digits > 0) | |
4871 | { | |
4872 | /* It is numeric. The numeric signal refers to our own | |
4873 | internal signal numbering from target.h, not to host/target | |
4874 | signal number. This is a feature; users really should be | |
4875 | using symbolic names anyway, and the common ones like | |
4876 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
4877 | ||
4878 | sigfirst = siglast = (int) | |
4879 | target_signal_from_command (atoi (*argv)); | |
4880 | if ((*argv)[digits] == '-') | |
4881 | { | |
4882 | siglast = (int) | |
4883 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
4884 | } | |
4885 | if (sigfirst > siglast) | |
4886 | { | |
4887 | /* Bet he didn't figure we'd think of this case... */ | |
4888 | signum = sigfirst; | |
4889 | sigfirst = siglast; | |
4890 | siglast = signum; | |
4891 | } | |
4892 | } | |
4893 | else | |
4894 | { | |
4895 | oursig = target_signal_from_name (*argv); | |
4896 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
4897 | { | |
4898 | sigfirst = siglast = (int) oursig; | |
4899 | } | |
4900 | else | |
4901 | { | |
4902 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 4903 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
4904 | } |
4905 | } | |
4906 | ||
4907 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 4908 | which signals to apply actions to. */ |
c906108c SS |
4909 | |
4910 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
4911 | { | |
4912 | switch ((enum target_signal) signum) | |
4913 | { | |
4914 | case TARGET_SIGNAL_TRAP: | |
4915 | case TARGET_SIGNAL_INT: | |
4916 | if (!allsigs && !sigs[signum]) | |
4917 | { | |
9e2f0ad4 HZ |
4918 | if (query (_("%s is used by the debugger.\n\ |
4919 | Are you sure you want to change it? "), target_signal_to_name ((enum target_signal) signum))) | |
c906108c SS |
4920 | { |
4921 | sigs[signum] = 1; | |
4922 | } | |
4923 | else | |
4924 | { | |
a3f17187 | 4925 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
4926 | gdb_flush (gdb_stdout); |
4927 | } | |
4928 | } | |
4929 | break; | |
4930 | case TARGET_SIGNAL_0: | |
4931 | case TARGET_SIGNAL_DEFAULT: | |
4932 | case TARGET_SIGNAL_UNKNOWN: | |
4933 | /* Make sure that "all" doesn't print these. */ | |
4934 | break; | |
4935 | default: | |
4936 | sigs[signum] = 1; | |
4937 | break; | |
4938 | } | |
4939 | } | |
4940 | ||
4941 | argv++; | |
4942 | } | |
4943 | ||
3a031f65 PA |
4944 | for (signum = 0; signum < nsigs; signum++) |
4945 | if (sigs[signum]) | |
4946 | { | |
4947 | target_notice_signals (inferior_ptid); | |
c906108c | 4948 | |
3a031f65 PA |
4949 | if (from_tty) |
4950 | { | |
4951 | /* Show the results. */ | |
4952 | sig_print_header (); | |
4953 | for (; signum < nsigs; signum++) | |
4954 | if (sigs[signum]) | |
4955 | sig_print_info (signum); | |
4956 | } | |
4957 | ||
4958 | break; | |
4959 | } | |
c906108c SS |
4960 | |
4961 | do_cleanups (old_chain); | |
4962 | } | |
4963 | ||
4964 | static void | |
96baa820 | 4965 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
4966 | { |
4967 | char **argv; | |
4968 | struct cleanup *old_chain; | |
4969 | ||
d1a41061 PP |
4970 | if (args == NULL) |
4971 | error_no_arg (_("xdb command")); | |
4972 | ||
c906108c SS |
4973 | /* Break the command line up into args. */ |
4974 | ||
d1a41061 | 4975 | argv = gdb_buildargv (args); |
7a292a7a | 4976 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
4977 | if (argv[1] != (char *) NULL) |
4978 | { | |
4979 | char *argBuf; | |
4980 | int bufLen; | |
4981 | ||
4982 | bufLen = strlen (argv[0]) + 20; | |
4983 | argBuf = (char *) xmalloc (bufLen); | |
4984 | if (argBuf) | |
4985 | { | |
4986 | int validFlag = 1; | |
4987 | enum target_signal oursig; | |
4988 | ||
4989 | oursig = target_signal_from_name (argv[0]); | |
4990 | memset (argBuf, 0, bufLen); | |
4991 | if (strcmp (argv[1], "Q") == 0) | |
4992 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
4993 | else | |
4994 | { | |
4995 | if (strcmp (argv[1], "s") == 0) | |
4996 | { | |
4997 | if (!signal_stop[oursig]) | |
4998 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
4999 | else | |
5000 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
5001 | } | |
5002 | else if (strcmp (argv[1], "i") == 0) | |
5003 | { | |
5004 | if (!signal_program[oursig]) | |
5005 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
5006 | else | |
5007 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
5008 | } | |
5009 | else if (strcmp (argv[1], "r") == 0) | |
5010 | { | |
5011 | if (!signal_print[oursig]) | |
5012 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
5013 | else | |
5014 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
5015 | } | |
5016 | else | |
5017 | validFlag = 0; | |
5018 | } | |
5019 | if (validFlag) | |
5020 | handle_command (argBuf, from_tty); | |
5021 | else | |
a3f17187 | 5022 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 5023 | if (argBuf) |
b8c9b27d | 5024 | xfree (argBuf); |
c906108c SS |
5025 | } |
5026 | } | |
5027 | do_cleanups (old_chain); | |
5028 | } | |
5029 | ||
5030 | /* Print current contents of the tables set by the handle command. | |
5031 | It is possible we should just be printing signals actually used | |
5032 | by the current target (but for things to work right when switching | |
5033 | targets, all signals should be in the signal tables). */ | |
5034 | ||
5035 | static void | |
96baa820 | 5036 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
5037 | { |
5038 | enum target_signal oursig; | |
5039 | sig_print_header (); | |
5040 | ||
5041 | if (signum_exp) | |
5042 | { | |
5043 | /* First see if this is a symbol name. */ | |
5044 | oursig = target_signal_from_name (signum_exp); | |
5045 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
5046 | { | |
5047 | /* No, try numeric. */ | |
5048 | oursig = | |
bb518678 | 5049 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
5050 | } |
5051 | sig_print_info (oursig); | |
5052 | return; | |
5053 | } | |
5054 | ||
5055 | printf_filtered ("\n"); | |
5056 | /* These ugly casts brought to you by the native VAX compiler. */ | |
5057 | for (oursig = TARGET_SIGNAL_FIRST; | |
5058 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
5059 | oursig = (enum target_signal) ((int) oursig + 1)) | |
5060 | { | |
5061 | QUIT; | |
5062 | ||
5063 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 5064 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
5065 | sig_print_info (oursig); |
5066 | } | |
5067 | ||
a3f17187 | 5068 | printf_filtered (_("\nUse the \"handle\" command to change these tables.\n")); |
c906108c | 5069 | } |
4aa995e1 PA |
5070 | |
5071 | /* The $_siginfo convenience variable is a bit special. We don't know | |
5072 | for sure the type of the value until we actually have a chance to | |
5073 | fetch the data. The type can change depending on gdbarch, so it it | |
5074 | also dependent on which thread you have selected. | |
5075 | ||
5076 | 1. making $_siginfo be an internalvar that creates a new value on | |
5077 | access. | |
5078 | ||
5079 | 2. making the value of $_siginfo be an lval_computed value. */ | |
5080 | ||
5081 | /* This function implements the lval_computed support for reading a | |
5082 | $_siginfo value. */ | |
5083 | ||
5084 | static void | |
5085 | siginfo_value_read (struct value *v) | |
5086 | { | |
5087 | LONGEST transferred; | |
5088 | ||
5089 | transferred = | |
5090 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
5091 | NULL, | |
5092 | value_contents_all_raw (v), | |
5093 | value_offset (v), | |
5094 | TYPE_LENGTH (value_type (v))); | |
5095 | ||
5096 | if (transferred != TYPE_LENGTH (value_type (v))) | |
5097 | error (_("Unable to read siginfo")); | |
5098 | } | |
5099 | ||
5100 | /* This function implements the lval_computed support for writing a | |
5101 | $_siginfo value. */ | |
5102 | ||
5103 | static void | |
5104 | siginfo_value_write (struct value *v, struct value *fromval) | |
5105 | { | |
5106 | LONGEST transferred; | |
5107 | ||
5108 | transferred = target_write (¤t_target, | |
5109 | TARGET_OBJECT_SIGNAL_INFO, | |
5110 | NULL, | |
5111 | value_contents_all_raw (fromval), | |
5112 | value_offset (v), | |
5113 | TYPE_LENGTH (value_type (fromval))); | |
5114 | ||
5115 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
5116 | error (_("Unable to write siginfo")); | |
5117 | } | |
5118 | ||
5119 | static struct lval_funcs siginfo_value_funcs = | |
5120 | { | |
5121 | siginfo_value_read, | |
5122 | siginfo_value_write | |
5123 | }; | |
5124 | ||
5125 | /* Return a new value with the correct type for the siginfo object of | |
5126 | the current thread. Return a void value if there's no object | |
5127 | available. */ | |
5128 | ||
2c0b251b | 5129 | static struct value * |
4aa995e1 PA |
5130 | siginfo_make_value (struct internalvar *var) |
5131 | { | |
5132 | struct type *type; | |
5133 | struct gdbarch *gdbarch; | |
5134 | ||
5135 | if (target_has_stack | |
5136 | && !ptid_equal (inferior_ptid, null_ptid)) | |
5137 | { | |
5138 | gdbarch = get_frame_arch (get_current_frame ()); | |
5139 | ||
5140 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
5141 | { | |
5142 | type = gdbarch_get_siginfo_type (gdbarch); | |
5143 | ||
5144 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); | |
5145 | } | |
5146 | } | |
5147 | ||
5148 | return allocate_value (builtin_type_void); | |
5149 | } | |
5150 | ||
c906108c | 5151 | \f |
b89667eb DE |
5152 | /* Inferior thread state. |
5153 | These are details related to the inferior itself, and don't include | |
5154 | things like what frame the user had selected or what gdb was doing | |
5155 | with the target at the time. | |
5156 | For inferior function calls these are things we want to restore | |
5157 | regardless of whether the function call successfully completes | |
5158 | or the dummy frame has to be manually popped. */ | |
5159 | ||
5160 | struct inferior_thread_state | |
7a292a7a SS |
5161 | { |
5162 | enum target_signal stop_signal; | |
5163 | CORE_ADDR stop_pc; | |
b89667eb DE |
5164 | struct regcache *registers; |
5165 | }; | |
5166 | ||
5167 | struct inferior_thread_state * | |
5168 | save_inferior_thread_state (void) | |
5169 | { | |
5170 | struct inferior_thread_state *inf_state = XMALLOC (struct inferior_thread_state); | |
5171 | struct thread_info *tp = inferior_thread (); | |
5172 | ||
5173 | inf_state->stop_signal = tp->stop_signal; | |
5174 | inf_state->stop_pc = stop_pc; | |
5175 | ||
5176 | inf_state->registers = regcache_dup (get_current_regcache ()); | |
5177 | ||
5178 | return inf_state; | |
5179 | } | |
5180 | ||
5181 | /* Restore inferior session state to INF_STATE. */ | |
5182 | ||
5183 | void | |
5184 | restore_inferior_thread_state (struct inferior_thread_state *inf_state) | |
5185 | { | |
5186 | struct thread_info *tp = inferior_thread (); | |
5187 | ||
5188 | tp->stop_signal = inf_state->stop_signal; | |
5189 | stop_pc = inf_state->stop_pc; | |
5190 | ||
5191 | /* The inferior can be gone if the user types "print exit(0)" | |
5192 | (and perhaps other times). */ | |
5193 | if (target_has_execution) | |
5194 | /* NB: The register write goes through to the target. */ | |
5195 | regcache_cpy (get_current_regcache (), inf_state->registers); | |
5196 | regcache_xfree (inf_state->registers); | |
5197 | xfree (inf_state); | |
5198 | } | |
5199 | ||
5200 | static void | |
5201 | do_restore_inferior_thread_state_cleanup (void *state) | |
5202 | { | |
5203 | restore_inferior_thread_state (state); | |
5204 | } | |
5205 | ||
5206 | struct cleanup * | |
5207 | make_cleanup_restore_inferior_thread_state (struct inferior_thread_state *inf_state) | |
5208 | { | |
5209 | return make_cleanup (do_restore_inferior_thread_state_cleanup, inf_state); | |
5210 | } | |
5211 | ||
5212 | void | |
5213 | discard_inferior_thread_state (struct inferior_thread_state *inf_state) | |
5214 | { | |
5215 | regcache_xfree (inf_state->registers); | |
5216 | xfree (inf_state); | |
5217 | } | |
5218 | ||
5219 | struct regcache * | |
5220 | get_inferior_thread_state_regcache (struct inferior_thread_state *inf_state) | |
5221 | { | |
5222 | return inf_state->registers; | |
5223 | } | |
5224 | ||
5225 | /* Session related state for inferior function calls. | |
5226 | These are the additional bits of state that need to be restored | |
5227 | when an inferior function call successfully completes. */ | |
5228 | ||
5229 | struct inferior_status | |
5230 | { | |
7a292a7a SS |
5231 | bpstat stop_bpstat; |
5232 | int stop_step; | |
5233 | int stop_stack_dummy; | |
5234 | int stopped_by_random_signal; | |
ca67fcb8 | 5235 | int stepping_over_breakpoint; |
7a292a7a SS |
5236 | CORE_ADDR step_range_start; |
5237 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 5238 | struct frame_id step_frame_id; |
5fbbeb29 | 5239 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
5240 | CORE_ADDR step_resume_break_address; |
5241 | int stop_after_trap; | |
c0236d92 | 5242 | int stop_soon; |
7a292a7a | 5243 | |
b89667eb | 5244 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe AC |
5245 | struct frame_id selected_frame_id; |
5246 | ||
7a292a7a | 5247 | int proceed_to_finish; |
c5a4d20b | 5248 | int in_infcall; |
7a292a7a SS |
5249 | }; |
5250 | ||
c906108c | 5251 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 5252 | connection. */ |
c906108c | 5253 | |
7a292a7a | 5254 | struct inferior_status * |
b89667eb | 5255 | save_inferior_status (void) |
c906108c | 5256 | { |
72cec141 | 5257 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
4e1c45ea | 5258 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 5259 | struct inferior *inf = current_inferior (); |
7a292a7a | 5260 | |
414c69f7 | 5261 | inf_status->stop_step = tp->stop_step; |
c906108c SS |
5262 | inf_status->stop_stack_dummy = stop_stack_dummy; |
5263 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
4e1c45ea PA |
5264 | inf_status->stepping_over_breakpoint = tp->trap_expected; |
5265 | inf_status->step_range_start = tp->step_range_start; | |
5266 | inf_status->step_range_end = tp->step_range_end; | |
5267 | inf_status->step_frame_id = tp->step_frame_id; | |
078130d0 | 5268 | inf_status->step_over_calls = tp->step_over_calls; |
c906108c | 5269 | inf_status->stop_after_trap = stop_after_trap; |
d6b48e9c | 5270 | inf_status->stop_soon = inf->stop_soon; |
c906108c SS |
5271 | /* Save original bpstat chain here; replace it with copy of chain. |
5272 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
5273 | hand them back the original chain when restore_inferior_status is |
5274 | called. */ | |
347bddb7 PA |
5275 | inf_status->stop_bpstat = tp->stop_bpstat; |
5276 | tp->stop_bpstat = bpstat_copy (tp->stop_bpstat); | |
32400beb | 5277 | inf_status->proceed_to_finish = tp->proceed_to_finish; |
c5a4d20b | 5278 | inf_status->in_infcall = tp->in_infcall; |
c5aa993b | 5279 | |
206415a3 | 5280 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 5281 | |
7a292a7a | 5282 | return inf_status; |
c906108c SS |
5283 | } |
5284 | ||
c906108c | 5285 | static int |
96baa820 | 5286 | restore_selected_frame (void *args) |
c906108c | 5287 | { |
488f131b | 5288 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 5289 | struct frame_info *frame; |
c906108c | 5290 | |
101dcfbe | 5291 | frame = frame_find_by_id (*fid); |
c906108c | 5292 | |
aa0cd9c1 AC |
5293 | /* If inf_status->selected_frame_id is NULL, there was no previously |
5294 | selected frame. */ | |
101dcfbe | 5295 | if (frame == NULL) |
c906108c | 5296 | { |
8a3fe4f8 | 5297 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
5298 | return 0; |
5299 | } | |
5300 | ||
0f7d239c | 5301 | select_frame (frame); |
c906108c SS |
5302 | |
5303 | return (1); | |
5304 | } | |
5305 | ||
b89667eb DE |
5306 | /* Restore inferior session state to INF_STATUS. */ |
5307 | ||
c906108c | 5308 | void |
96baa820 | 5309 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c | 5310 | { |
4e1c45ea | 5311 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 5312 | struct inferior *inf = current_inferior (); |
4e1c45ea | 5313 | |
414c69f7 | 5314 | tp->stop_step = inf_status->stop_step; |
c906108c SS |
5315 | stop_stack_dummy = inf_status->stop_stack_dummy; |
5316 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
4e1c45ea PA |
5317 | tp->trap_expected = inf_status->stepping_over_breakpoint; |
5318 | tp->step_range_start = inf_status->step_range_start; | |
5319 | tp->step_range_end = inf_status->step_range_end; | |
5320 | tp->step_frame_id = inf_status->step_frame_id; | |
078130d0 | 5321 | tp->step_over_calls = inf_status->step_over_calls; |
c906108c | 5322 | stop_after_trap = inf_status->stop_after_trap; |
d6b48e9c | 5323 | inf->stop_soon = inf_status->stop_soon; |
347bddb7 PA |
5324 | bpstat_clear (&tp->stop_bpstat); |
5325 | tp->stop_bpstat = inf_status->stop_bpstat; | |
b89667eb | 5326 | inf_status->stop_bpstat = NULL; |
32400beb | 5327 | tp->proceed_to_finish = inf_status->proceed_to_finish; |
c5a4d20b | 5328 | tp->in_infcall = inf_status->in_infcall; |
c906108c | 5329 | |
b89667eb | 5330 | if (target_has_stack) |
c906108c | 5331 | { |
c906108c | 5332 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
5333 | walking the stack might encounter a garbage pointer and |
5334 | error() trying to dereference it. */ | |
488f131b JB |
5335 | if (catch_errors |
5336 | (restore_selected_frame, &inf_status->selected_frame_id, | |
5337 | "Unable to restore previously selected frame:\n", | |
5338 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
5339 | /* Error in restoring the selected frame. Select the innermost |
5340 | frame. */ | |
0f7d239c | 5341 | select_frame (get_current_frame ()); |
c906108c | 5342 | } |
c906108c | 5343 | |
72cec141 | 5344 | xfree (inf_status); |
7a292a7a | 5345 | } |
c906108c | 5346 | |
74b7792f AC |
5347 | static void |
5348 | do_restore_inferior_status_cleanup (void *sts) | |
5349 | { | |
5350 | restore_inferior_status (sts); | |
5351 | } | |
5352 | ||
5353 | struct cleanup * | |
5354 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
5355 | { | |
5356 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
5357 | } | |
5358 | ||
c906108c | 5359 | void |
96baa820 | 5360 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
5361 | { |
5362 | /* See save_inferior_status for info on stop_bpstat. */ | |
5363 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 | 5364 | xfree (inf_status); |
7a292a7a | 5365 | } |
b89667eb | 5366 | \f |
47932f85 | 5367 | int |
3a3e9ee3 | 5368 | inferior_has_forked (ptid_t pid, ptid_t *child_pid) |
47932f85 DJ |
5369 | { |
5370 | struct target_waitstatus last; | |
5371 | ptid_t last_ptid; | |
5372 | ||
5373 | get_last_target_status (&last_ptid, &last); | |
5374 | ||
5375 | if (last.kind != TARGET_WAITKIND_FORKED) | |
5376 | return 0; | |
5377 | ||
3a3e9ee3 | 5378 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
5379 | return 0; |
5380 | ||
5381 | *child_pid = last.value.related_pid; | |
5382 | return 1; | |
5383 | } | |
5384 | ||
5385 | int | |
3a3e9ee3 | 5386 | inferior_has_vforked (ptid_t pid, ptid_t *child_pid) |
47932f85 DJ |
5387 | { |
5388 | struct target_waitstatus last; | |
5389 | ptid_t last_ptid; | |
5390 | ||
5391 | get_last_target_status (&last_ptid, &last); | |
5392 | ||
5393 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
5394 | return 0; | |
5395 | ||
3a3e9ee3 | 5396 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
5397 | return 0; |
5398 | ||
5399 | *child_pid = last.value.related_pid; | |
5400 | return 1; | |
5401 | } | |
5402 | ||
5403 | int | |
3a3e9ee3 | 5404 | inferior_has_execd (ptid_t pid, char **execd_pathname) |
47932f85 DJ |
5405 | { |
5406 | struct target_waitstatus last; | |
5407 | ptid_t last_ptid; | |
5408 | ||
5409 | get_last_target_status (&last_ptid, &last); | |
5410 | ||
5411 | if (last.kind != TARGET_WAITKIND_EXECD) | |
5412 | return 0; | |
5413 | ||
3a3e9ee3 | 5414 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
5415 | return 0; |
5416 | ||
5417 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
5418 | return 1; | |
5419 | } | |
5420 | ||
ca6724c1 KB |
5421 | /* Oft used ptids */ |
5422 | ptid_t null_ptid; | |
5423 | ptid_t minus_one_ptid; | |
5424 | ||
5425 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 5426 | |
ca6724c1 KB |
5427 | ptid_t |
5428 | ptid_build (int pid, long lwp, long tid) | |
5429 | { | |
5430 | ptid_t ptid; | |
5431 | ||
5432 | ptid.pid = pid; | |
5433 | ptid.lwp = lwp; | |
5434 | ptid.tid = tid; | |
5435 | return ptid; | |
5436 | } | |
5437 | ||
5438 | /* Create a ptid from just a pid. */ | |
5439 | ||
5440 | ptid_t | |
5441 | pid_to_ptid (int pid) | |
5442 | { | |
5443 | return ptid_build (pid, 0, 0); | |
5444 | } | |
5445 | ||
5446 | /* Fetch the pid (process id) component from a ptid. */ | |
5447 | ||
5448 | int | |
5449 | ptid_get_pid (ptid_t ptid) | |
5450 | { | |
5451 | return ptid.pid; | |
5452 | } | |
5453 | ||
5454 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
5455 | ||
5456 | long | |
5457 | ptid_get_lwp (ptid_t ptid) | |
5458 | { | |
5459 | return ptid.lwp; | |
5460 | } | |
5461 | ||
5462 | /* Fetch the tid (thread id) component from a ptid. */ | |
5463 | ||
5464 | long | |
5465 | ptid_get_tid (ptid_t ptid) | |
5466 | { | |
5467 | return ptid.tid; | |
5468 | } | |
5469 | ||
5470 | /* ptid_equal() is used to test equality of two ptids. */ | |
5471 | ||
5472 | int | |
5473 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
5474 | { | |
5475 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 5476 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
5477 | } |
5478 | ||
252fbfc8 PA |
5479 | /* Returns true if PTID represents a process. */ |
5480 | ||
5481 | int | |
5482 | ptid_is_pid (ptid_t ptid) | |
5483 | { | |
5484 | if (ptid_equal (minus_one_ptid, ptid)) | |
5485 | return 0; | |
5486 | if (ptid_equal (null_ptid, ptid)) | |
5487 | return 0; | |
5488 | ||
5489 | return (ptid_get_lwp (ptid) == 0 && ptid_get_tid (ptid) == 0); | |
5490 | } | |
5491 | ||
ca6724c1 KB |
5492 | /* restore_inferior_ptid() will be used by the cleanup machinery |
5493 | to restore the inferior_ptid value saved in a call to | |
5494 | save_inferior_ptid(). */ | |
ce696e05 KB |
5495 | |
5496 | static void | |
5497 | restore_inferior_ptid (void *arg) | |
5498 | { | |
5499 | ptid_t *saved_ptid_ptr = arg; | |
5500 | inferior_ptid = *saved_ptid_ptr; | |
5501 | xfree (arg); | |
5502 | } | |
5503 | ||
5504 | /* Save the value of inferior_ptid so that it may be restored by a | |
5505 | later call to do_cleanups(). Returns the struct cleanup pointer | |
5506 | needed for later doing the cleanup. */ | |
5507 | ||
5508 | struct cleanup * | |
5509 | save_inferior_ptid (void) | |
5510 | { | |
5511 | ptid_t *saved_ptid_ptr; | |
5512 | ||
5513 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
5514 | *saved_ptid_ptr = inferior_ptid; | |
5515 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
5516 | } | |
c5aa993b | 5517 | \f |
488f131b | 5518 | |
b2175913 MS |
5519 | /* User interface for reverse debugging: |
5520 | Set exec-direction / show exec-direction commands | |
5521 | (returns error unless target implements to_set_exec_direction method). */ | |
5522 | ||
5523 | enum exec_direction_kind execution_direction = EXEC_FORWARD; | |
5524 | static const char exec_forward[] = "forward"; | |
5525 | static const char exec_reverse[] = "reverse"; | |
5526 | static const char *exec_direction = exec_forward; | |
5527 | static const char *exec_direction_names[] = { | |
5528 | exec_forward, | |
5529 | exec_reverse, | |
5530 | NULL | |
5531 | }; | |
5532 | ||
5533 | static void | |
5534 | set_exec_direction_func (char *args, int from_tty, | |
5535 | struct cmd_list_element *cmd) | |
5536 | { | |
5537 | if (target_can_execute_reverse) | |
5538 | { | |
5539 | if (!strcmp (exec_direction, exec_forward)) | |
5540 | execution_direction = EXEC_FORWARD; | |
5541 | else if (!strcmp (exec_direction, exec_reverse)) | |
5542 | execution_direction = EXEC_REVERSE; | |
5543 | } | |
5544 | } | |
5545 | ||
5546 | static void | |
5547 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
5548 | struct cmd_list_element *cmd, const char *value) | |
5549 | { | |
5550 | switch (execution_direction) { | |
5551 | case EXEC_FORWARD: | |
5552 | fprintf_filtered (out, _("Forward.\n")); | |
5553 | break; | |
5554 | case EXEC_REVERSE: | |
5555 | fprintf_filtered (out, _("Reverse.\n")); | |
5556 | break; | |
5557 | case EXEC_ERROR: | |
5558 | default: | |
5559 | fprintf_filtered (out, | |
5560 | _("Forward (target `%s' does not support exec-direction).\n"), | |
5561 | target_shortname); | |
5562 | break; | |
5563 | } | |
5564 | } | |
5565 | ||
5566 | /* User interface for non-stop mode. */ | |
5567 | ||
ad52ddc6 PA |
5568 | int non_stop = 0; |
5569 | static int non_stop_1 = 0; | |
5570 | ||
5571 | static void | |
5572 | set_non_stop (char *args, int from_tty, | |
5573 | struct cmd_list_element *c) | |
5574 | { | |
5575 | if (target_has_execution) | |
5576 | { | |
5577 | non_stop_1 = non_stop; | |
5578 | error (_("Cannot change this setting while the inferior is running.")); | |
5579 | } | |
5580 | ||
5581 | non_stop = non_stop_1; | |
5582 | } | |
5583 | ||
5584 | static void | |
5585 | show_non_stop (struct ui_file *file, int from_tty, | |
5586 | struct cmd_list_element *c, const char *value) | |
5587 | { | |
5588 | fprintf_filtered (file, | |
5589 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
5590 | value); | |
5591 | } | |
5592 | ||
d4db2f36 PA |
5593 | static void |
5594 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
5595 | struct cmd_list_element *c, const char *value) | |
5596 | { | |
5597 | fprintf_filtered (file, _("\ | |
5598 | Resuming the execution of threads of all processes is %s.\n"), value); | |
5599 | } | |
ad52ddc6 | 5600 | |
c906108c | 5601 | void |
96baa820 | 5602 | _initialize_infrun (void) |
c906108c | 5603 | { |
52f0bd74 AC |
5604 | int i; |
5605 | int numsigs; | |
c906108c SS |
5606 | struct cmd_list_element *c; |
5607 | ||
1bedd215 AC |
5608 | add_info ("signals", signals_info, _("\ |
5609 | What debugger does when program gets various signals.\n\ | |
5610 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
5611 | add_info_alias ("handle", "signals", 0); |
5612 | ||
1bedd215 AC |
5613 | add_com ("handle", class_run, handle_command, _("\ |
5614 | Specify how to handle a signal.\n\ | |
c906108c SS |
5615 | Args are signals and actions to apply to those signals.\n\ |
5616 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
5617 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
5618 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
5619 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
5620 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
5621 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
c906108c SS |
5622 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
5623 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
5624 | Print means print a message if this signal happens.\n\ | |
5625 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
5626 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 5627 | Pass and Stop may be combined.")); |
c906108c SS |
5628 | if (xdb_commands) |
5629 | { | |
1bedd215 AC |
5630 | add_com ("lz", class_info, signals_info, _("\ |
5631 | What debugger does when program gets various signals.\n\ | |
5632 | Specify a signal as argument to print info on that signal only.")); | |
5633 | add_com ("z", class_run, xdb_handle_command, _("\ | |
5634 | Specify how to handle a signal.\n\ | |
c906108c SS |
5635 | Args are signals and actions to apply to those signals.\n\ |
5636 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
5637 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
5638 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
5639 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
5640 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
5641 | Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
c906108c SS |
5642 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
5643 | nopass), \"Q\" (noprint)\n\ | |
5644 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
5645 | Print means print a message if this signal happens.\n\ | |
5646 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
5647 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 5648 | Pass and Stop may be combined.")); |
c906108c SS |
5649 | } |
5650 | ||
5651 | if (!dbx_commands) | |
1a966eab AC |
5652 | stop_command = add_cmd ("stop", class_obscure, |
5653 | not_just_help_class_command, _("\ | |
5654 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 5655 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 5656 | of the program stops."), &cmdlist); |
c906108c | 5657 | |
85c07804 AC |
5658 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
5659 | Set inferior debugging."), _("\ | |
5660 | Show inferior debugging."), _("\ | |
5661 | When non-zero, inferior specific debugging is enabled."), | |
5662 | NULL, | |
920d2a44 | 5663 | show_debug_infrun, |
85c07804 | 5664 | &setdebuglist, &showdebuglist); |
527159b7 | 5665 | |
237fc4c9 PA |
5666 | add_setshow_boolean_cmd ("displaced", class_maintenance, &debug_displaced, _("\ |
5667 | Set displaced stepping debugging."), _("\ | |
5668 | Show displaced stepping debugging."), _("\ | |
5669 | When non-zero, displaced stepping specific debugging is enabled."), | |
5670 | NULL, | |
5671 | show_debug_displaced, | |
5672 | &setdebuglist, &showdebuglist); | |
5673 | ||
ad52ddc6 PA |
5674 | add_setshow_boolean_cmd ("non-stop", no_class, |
5675 | &non_stop_1, _("\ | |
5676 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
5677 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
5678 | When debugging a multi-threaded program and this setting is\n\ | |
5679 | off (the default, also called all-stop mode), when one thread stops\n\ | |
5680 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
5681 | all other threads in the program while you interact with the thread of\n\ | |
5682 | interest. When you continue or step a thread, you can allow the other\n\ | |
5683 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
5684 | thread's state, all threads stop.\n\ | |
5685 | \n\ | |
5686 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
5687 | to run freely. You'll be able to step each thread independently,\n\ | |
5688 | leave it stopped or free to run as needed."), | |
5689 | set_non_stop, | |
5690 | show_non_stop, | |
5691 | &setlist, | |
5692 | &showlist); | |
5693 | ||
c906108c | 5694 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 5695 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
5696 | signal_print = (unsigned char *) |
5697 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
5698 | signal_program = (unsigned char *) | |
5699 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
5700 | for (i = 0; i < numsigs; i++) | |
5701 | { | |
5702 | signal_stop[i] = 1; | |
5703 | signal_print[i] = 1; | |
5704 | signal_program[i] = 1; | |
5705 | } | |
5706 | ||
5707 | /* Signals caused by debugger's own actions | |
5708 | should not be given to the program afterwards. */ | |
5709 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
5710 | signal_program[TARGET_SIGNAL_INT] = 0; | |
5711 | ||
5712 | /* Signals that are not errors should not normally enter the debugger. */ | |
5713 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
5714 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
5715 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
5716 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
5717 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
5718 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
5719 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
5720 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
5721 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
5722 | signal_print[TARGET_SIGNAL_IO] = 0; | |
5723 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
5724 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
5725 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
5726 | signal_print[TARGET_SIGNAL_URG] = 0; | |
5727 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
5728 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
5729 | ||
cd0fc7c3 SS |
5730 | /* These signals are used internally by user-level thread |
5731 | implementations. (See signal(5) on Solaris.) Like the above | |
5732 | signals, a healthy program receives and handles them as part of | |
5733 | its normal operation. */ | |
5734 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
5735 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
5736 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
5737 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
5738 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
5739 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
5740 | ||
85c07804 AC |
5741 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
5742 | &stop_on_solib_events, _("\ | |
5743 | Set stopping for shared library events."), _("\ | |
5744 | Show stopping for shared library events."), _("\ | |
c906108c SS |
5745 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
5746 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
5747 | to the user would be loading/unloading of a new library."), |
5748 | NULL, | |
920d2a44 | 5749 | show_stop_on_solib_events, |
85c07804 | 5750 | &setlist, &showlist); |
c906108c | 5751 | |
7ab04401 AC |
5752 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
5753 | follow_fork_mode_kind_names, | |
5754 | &follow_fork_mode_string, _("\ | |
5755 | Set debugger response to a program call of fork or vfork."), _("\ | |
5756 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
5757 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
5758 | parent - the original process is debugged after a fork\n\ | |
5759 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 5760 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
5761 | By default, the debugger will follow the parent process."), |
5762 | NULL, | |
920d2a44 | 5763 | show_follow_fork_mode_string, |
7ab04401 AC |
5764 | &setlist, &showlist); |
5765 | ||
5766 | add_setshow_enum_cmd ("scheduler-locking", class_run, | |
5767 | scheduler_enums, &scheduler_mode, _("\ | |
5768 | Set mode for locking scheduler during execution."), _("\ | |
5769 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
5770 | off == no locking (threads may preempt at any time)\n\ |
5771 | on == full locking (no thread except the current thread may run)\n\ | |
5772 | step == scheduler locked during every single-step operation.\n\ | |
5773 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
5774 | Other threads may run while stepping over a function call ('next')."), |
5775 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 5776 | show_scheduler_mode, |
7ab04401 | 5777 | &setlist, &showlist); |
5fbbeb29 | 5778 | |
d4db2f36 PA |
5779 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
5780 | Set mode for resuming threads of all processes."), _("\ | |
5781 | Show mode for resuming threads of all processes."), _("\ | |
5782 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
5783 | threads of all processes. When off (which is the default), execution\n\ | |
5784 | commands only resume the threads of the current process. The set of\n\ | |
5785 | threads that are resumed is further refined by the scheduler-locking\n\ | |
5786 | mode (see help set scheduler-locking)."), | |
5787 | NULL, | |
5788 | show_schedule_multiple, | |
5789 | &setlist, &showlist); | |
5790 | ||
5bf193a2 AC |
5791 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
5792 | Set mode of the step operation."), _("\ | |
5793 | Show mode of the step operation."), _("\ | |
5794 | When set, doing a step over a function without debug line information\n\ | |
5795 | will stop at the first instruction of that function. Otherwise, the\n\ | |
5796 | function is skipped and the step command stops at a different source line."), | |
5797 | NULL, | |
920d2a44 | 5798 | show_step_stop_if_no_debug, |
5bf193a2 | 5799 | &setlist, &showlist); |
ca6724c1 | 5800 | |
fff08868 HZ |
5801 | add_setshow_enum_cmd ("displaced-stepping", class_run, |
5802 | can_use_displaced_stepping_enum, | |
5803 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
5804 | Set debugger's willingness to use displaced stepping."), _("\ |
5805 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
5806 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
5807 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
5808 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
5809 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
5810 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
5811 | use it in all-stop mode (see help set non-stop)."), | |
5812 | NULL, | |
5813 | show_can_use_displaced_stepping, | |
5814 | &setlist, &showlist); | |
237fc4c9 | 5815 | |
b2175913 MS |
5816 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
5817 | &exec_direction, _("Set direction of execution.\n\ | |
5818 | Options are 'forward' or 'reverse'."), | |
5819 | _("Show direction of execution (forward/reverse)."), | |
5820 | _("Tells gdb whether to execute forward or backward."), | |
5821 | set_exec_direction_func, show_exec_direction_func, | |
5822 | &setlist, &showlist); | |
5823 | ||
ca6724c1 KB |
5824 | /* ptid initializations */ |
5825 | null_ptid = ptid_build (0, 0, 0); | |
5826 | minus_one_ptid = ptid_build (-1, 0, 0); | |
5827 | inferior_ptid = null_ptid; | |
5828 | target_last_wait_ptid = minus_one_ptid; | |
237fc4c9 | 5829 | displaced_step_ptid = null_ptid; |
5231c1fd PA |
5830 | |
5831 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 5832 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 5833 | observer_attach_thread_exit (infrun_thread_thread_exit); |
4aa995e1 PA |
5834 | |
5835 | /* Explicitly create without lookup, since that tries to create a | |
5836 | value with a void typed value, and when we get here, gdbarch | |
5837 | isn't initialized yet. At this point, we're quite sure there | |
5838 | isn't another convenience variable of the same name. */ | |
5839 | create_internalvar_type_lazy ("_siginfo", siginfo_make_value); | |
c906108c | 5840 | } |