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1 | /* Target-struct-independent code to start (run) and stop an inferior | |
2 | process. | |
3 | ||
4 | Copyright (C) 1986-2012 Free Software Foundation, Inc. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "defs.h" | |
22 | #include "gdb_string.h" | |
23 | #include <ctype.h> | |
24 | #include "symtab.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "exceptions.h" | |
28 | #include "breakpoint.h" | |
29 | #include "gdb_wait.h" | |
30 | #include "gdbcore.h" | |
31 | #include "gdbcmd.h" | |
32 | #include "cli/cli-script.h" | |
33 | #include "target.h" | |
34 | #include "gdbthread.h" | |
35 | #include "annotate.h" | |
36 | #include "symfile.h" | |
37 | #include "top.h" | |
38 | #include <signal.h> | |
39 | #include "inf-loop.h" | |
40 | #include "regcache.h" | |
41 | #include "value.h" | |
42 | #include "observer.h" | |
43 | #include "language.h" | |
44 | #include "solib.h" | |
45 | #include "main.h" | |
46 | #include "dictionary.h" | |
47 | #include "block.h" | |
48 | #include "gdb_assert.h" | |
49 | #include "mi/mi-common.h" | |
50 | #include "event-top.h" | |
51 | #include "record.h" | |
52 | #include "inline-frame.h" | |
53 | #include "jit.h" | |
54 | #include "tracepoint.h" | |
55 | #include "continuations.h" | |
56 | #include "interps.h" | |
57 | #include "skip.h" | |
58 | #include "probe.h" | |
59 | #include "objfiles.h" | |
60 | #include "completer.h" | |
61 | ||
62 | /* Prototypes for local functions */ | |
63 | ||
64 | static void signals_info (char *, int); | |
65 | ||
66 | static void handle_command (char *, int); | |
67 | ||
68 | static void sig_print_info (enum gdb_signal); | |
69 | ||
70 | static void sig_print_header (void); | |
71 | ||
72 | static void resume_cleanups (void *); | |
73 | ||
74 | static int hook_stop_stub (void *); | |
75 | ||
76 | static int restore_selected_frame (void *); | |
77 | ||
78 | static int follow_fork (void); | |
79 | ||
80 | static void set_schedlock_func (char *args, int from_tty, | |
81 | struct cmd_list_element *c); | |
82 | ||
83 | static int currently_stepping (struct thread_info *tp); | |
84 | ||
85 | static int currently_stepping_or_nexting_callback (struct thread_info *tp, | |
86 | void *data); | |
87 | ||
88 | static void xdb_handle_command (char *args, int from_tty); | |
89 | ||
90 | static int prepare_to_proceed (int); | |
91 | ||
92 | static void print_exited_reason (int exitstatus); | |
93 | ||
94 | static void print_signal_exited_reason (enum gdb_signal siggnal); | |
95 | ||
96 | static void print_no_history_reason (void); | |
97 | ||
98 | static void print_signal_received_reason (enum gdb_signal siggnal); | |
99 | ||
100 | static void print_end_stepping_range_reason (void); | |
101 | ||
102 | void _initialize_infrun (void); | |
103 | ||
104 | void nullify_last_target_wait_ptid (void); | |
105 | ||
106 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); | |
107 | ||
108 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
109 | ||
110 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); | |
111 | ||
112 | /* When set, stop the 'step' command if we enter a function which has | |
113 | no line number information. The normal behavior is that we step | |
114 | over such function. */ | |
115 | int step_stop_if_no_debug = 0; | |
116 | static void | |
117 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
118 | struct cmd_list_element *c, const char *value) | |
119 | { | |
120 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
121 | } | |
122 | ||
123 | /* In asynchronous mode, but simulating synchronous execution. */ | |
124 | ||
125 | int sync_execution = 0; | |
126 | ||
127 | /* wait_for_inferior and normal_stop use this to notify the user | |
128 | when the inferior stopped in a different thread than it had been | |
129 | running in. */ | |
130 | ||
131 | static ptid_t previous_inferior_ptid; | |
132 | ||
133 | /* Default behavior is to detach newly forked processes (legacy). */ | |
134 | int detach_fork = 1; | |
135 | ||
136 | int debug_displaced = 0; | |
137 | static void | |
138 | show_debug_displaced (struct ui_file *file, int from_tty, | |
139 | struct cmd_list_element *c, const char *value) | |
140 | { | |
141 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
142 | } | |
143 | ||
144 | unsigned int debug_infrun = 0; | |
145 | static void | |
146 | show_debug_infrun (struct ui_file *file, int from_tty, | |
147 | struct cmd_list_element *c, const char *value) | |
148 | { | |
149 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
150 | } | |
151 | ||
152 | ||
153 | /* Support for disabling address space randomization. */ | |
154 | ||
155 | int disable_randomization = 1; | |
156 | ||
157 | static void | |
158 | show_disable_randomization (struct ui_file *file, int from_tty, | |
159 | struct cmd_list_element *c, const char *value) | |
160 | { | |
161 | if (target_supports_disable_randomization ()) | |
162 | fprintf_filtered (file, | |
163 | _("Disabling randomization of debuggee's " | |
164 | "virtual address space is %s.\n"), | |
165 | value); | |
166 | else | |
167 | fputs_filtered (_("Disabling randomization of debuggee's " | |
168 | "virtual address space is unsupported on\n" | |
169 | "this platform.\n"), file); | |
170 | } | |
171 | ||
172 | static void | |
173 | set_disable_randomization (char *args, int from_tty, | |
174 | struct cmd_list_element *c) | |
175 | { | |
176 | if (!target_supports_disable_randomization ()) | |
177 | error (_("Disabling randomization of debuggee's " | |
178 | "virtual address space is unsupported on\n" | |
179 | "this platform.")); | |
180 | } | |
181 | ||
182 | ||
183 | /* If the program uses ELF-style shared libraries, then calls to | |
184 | functions in shared libraries go through stubs, which live in a | |
185 | table called the PLT (Procedure Linkage Table). The first time the | |
186 | function is called, the stub sends control to the dynamic linker, | |
187 | which looks up the function's real address, patches the stub so | |
188 | that future calls will go directly to the function, and then passes | |
189 | control to the function. | |
190 | ||
191 | If we are stepping at the source level, we don't want to see any of | |
192 | this --- we just want to skip over the stub and the dynamic linker. | |
193 | The simple approach is to single-step until control leaves the | |
194 | dynamic linker. | |
195 | ||
196 | However, on some systems (e.g., Red Hat's 5.2 distribution) the | |
197 | dynamic linker calls functions in the shared C library, so you | |
198 | can't tell from the PC alone whether the dynamic linker is still | |
199 | running. In this case, we use a step-resume breakpoint to get us | |
200 | past the dynamic linker, as if we were using "next" to step over a | |
201 | function call. | |
202 | ||
203 | in_solib_dynsym_resolve_code() says whether we're in the dynamic | |
204 | linker code or not. Normally, this means we single-step. However, | |
205 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
206 | address where we can place a step-resume breakpoint to get past the | |
207 | linker's symbol resolution function. | |
208 | ||
209 | in_solib_dynsym_resolve_code() can generally be implemented in a | |
210 | pretty portable way, by comparing the PC against the address ranges | |
211 | of the dynamic linker's sections. | |
212 | ||
213 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
214 | it depends on internal details of the dynamic linker. It's usually | |
215 | not too hard to figure out where to put a breakpoint, but it | |
216 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
217 | sanity checking. If it can't figure things out, returning zero and | |
218 | getting the (possibly confusing) stepping behavior is better than | |
219 | signalling an error, which will obscure the change in the | |
220 | inferior's state. */ | |
221 | ||
222 | /* This function returns TRUE if pc is the address of an instruction | |
223 | that lies within the dynamic linker (such as the event hook, or the | |
224 | dld itself). | |
225 | ||
226 | This function must be used only when a dynamic linker event has | |
227 | been caught, and the inferior is being stepped out of the hook, or | |
228 | undefined results are guaranteed. */ | |
229 | ||
230 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
231 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
232 | #endif | |
233 | ||
234 | /* "Observer mode" is somewhat like a more extreme version of | |
235 | non-stop, in which all GDB operations that might affect the | |
236 | target's execution have been disabled. */ | |
237 | ||
238 | static int non_stop_1 = 0; | |
239 | ||
240 | int observer_mode = 0; | |
241 | static int observer_mode_1 = 0; | |
242 | ||
243 | static void | |
244 | set_observer_mode (char *args, int from_tty, | |
245 | struct cmd_list_element *c) | |
246 | { | |
247 | extern int pagination_enabled; | |
248 | ||
249 | if (target_has_execution) | |
250 | { | |
251 | observer_mode_1 = observer_mode; | |
252 | error (_("Cannot change this setting while the inferior is running.")); | |
253 | } | |
254 | ||
255 | observer_mode = observer_mode_1; | |
256 | ||
257 | may_write_registers = !observer_mode; | |
258 | may_write_memory = !observer_mode; | |
259 | may_insert_breakpoints = !observer_mode; | |
260 | may_insert_tracepoints = !observer_mode; | |
261 | /* We can insert fast tracepoints in or out of observer mode, | |
262 | but enable them if we're going into this mode. */ | |
263 | if (observer_mode) | |
264 | may_insert_fast_tracepoints = 1; | |
265 | may_stop = !observer_mode; | |
266 | update_target_permissions (); | |
267 | ||
268 | /* Going *into* observer mode we must force non-stop, then | |
269 | going out we leave it that way. */ | |
270 | if (observer_mode) | |
271 | { | |
272 | target_async_permitted = 1; | |
273 | pagination_enabled = 0; | |
274 | non_stop = non_stop_1 = 1; | |
275 | } | |
276 | ||
277 | if (from_tty) | |
278 | printf_filtered (_("Observer mode is now %s.\n"), | |
279 | (observer_mode ? "on" : "off")); | |
280 | } | |
281 | ||
282 | static void | |
283 | show_observer_mode (struct ui_file *file, int from_tty, | |
284 | struct cmd_list_element *c, const char *value) | |
285 | { | |
286 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
287 | } | |
288 | ||
289 | /* This updates the value of observer mode based on changes in | |
290 | permissions. Note that we are deliberately ignoring the values of | |
291 | may-write-registers and may-write-memory, since the user may have | |
292 | reason to enable these during a session, for instance to turn on a | |
293 | debugging-related global. */ | |
294 | ||
295 | void | |
296 | update_observer_mode (void) | |
297 | { | |
298 | int newval; | |
299 | ||
300 | newval = (!may_insert_breakpoints | |
301 | && !may_insert_tracepoints | |
302 | && may_insert_fast_tracepoints | |
303 | && !may_stop | |
304 | && non_stop); | |
305 | ||
306 | /* Let the user know if things change. */ | |
307 | if (newval != observer_mode) | |
308 | printf_filtered (_("Observer mode is now %s.\n"), | |
309 | (newval ? "on" : "off")); | |
310 | ||
311 | observer_mode = observer_mode_1 = newval; | |
312 | } | |
313 | ||
314 | /* Tables of how to react to signals; the user sets them. */ | |
315 | ||
316 | static unsigned char *signal_stop; | |
317 | static unsigned char *signal_print; | |
318 | static unsigned char *signal_program; | |
319 | ||
320 | /* Table of signals that the target may silently handle. | |
321 | This is automatically determined from the flags above, | |
322 | and simply cached here. */ | |
323 | static unsigned char *signal_pass; | |
324 | ||
325 | #define SET_SIGS(nsigs,sigs,flags) \ | |
326 | do { \ | |
327 | int signum = (nsigs); \ | |
328 | while (signum-- > 0) \ | |
329 | if ((sigs)[signum]) \ | |
330 | (flags)[signum] = 1; \ | |
331 | } while (0) | |
332 | ||
333 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
334 | do { \ | |
335 | int signum = (nsigs); \ | |
336 | while (signum-- > 0) \ | |
337 | if ((sigs)[signum]) \ | |
338 | (flags)[signum] = 0; \ | |
339 | } while (0) | |
340 | ||
341 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of | |
342 | this function is to avoid exporting `signal_program'. */ | |
343 | ||
344 | void | |
345 | update_signals_program_target (void) | |
346 | { | |
347 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
348 | } | |
349 | ||
350 | /* Value to pass to target_resume() to cause all threads to resume. */ | |
351 | ||
352 | #define RESUME_ALL minus_one_ptid | |
353 | ||
354 | /* Command list pointer for the "stop" placeholder. */ | |
355 | ||
356 | static struct cmd_list_element *stop_command; | |
357 | ||
358 | /* Function inferior was in as of last step command. */ | |
359 | ||
360 | static struct symbol *step_start_function; | |
361 | ||
362 | /* Nonzero if we want to give control to the user when we're notified | |
363 | of shared library events by the dynamic linker. */ | |
364 | int stop_on_solib_events; | |
365 | static void | |
366 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
367 | struct cmd_list_element *c, const char *value) | |
368 | { | |
369 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
370 | value); | |
371 | } | |
372 | ||
373 | /* Nonzero means expecting a trace trap | |
374 | and should stop the inferior and return silently when it happens. */ | |
375 | ||
376 | int stop_after_trap; | |
377 | ||
378 | /* Save register contents here when executing a "finish" command or are | |
379 | about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set. | |
380 | Thus this contains the return value from the called function (assuming | |
381 | values are returned in a register). */ | |
382 | ||
383 | struct regcache *stop_registers; | |
384 | ||
385 | /* Nonzero after stop if current stack frame should be printed. */ | |
386 | ||
387 | static int stop_print_frame; | |
388 | ||
389 | /* This is a cached copy of the pid/waitstatus of the last event | |
390 | returned by target_wait()/deprecated_target_wait_hook(). This | |
391 | information is returned by get_last_target_status(). */ | |
392 | static ptid_t target_last_wait_ptid; | |
393 | static struct target_waitstatus target_last_waitstatus; | |
394 | ||
395 | static void context_switch (ptid_t ptid); | |
396 | ||
397 | void init_thread_stepping_state (struct thread_info *tss); | |
398 | ||
399 | void init_infwait_state (void); | |
400 | ||
401 | static const char follow_fork_mode_child[] = "child"; | |
402 | static const char follow_fork_mode_parent[] = "parent"; | |
403 | ||
404 | static const char *const follow_fork_mode_kind_names[] = { | |
405 | follow_fork_mode_child, | |
406 | follow_fork_mode_parent, | |
407 | NULL | |
408 | }; | |
409 | ||
410 | static const char *follow_fork_mode_string = follow_fork_mode_parent; | |
411 | static void | |
412 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
413 | struct cmd_list_element *c, const char *value) | |
414 | { | |
415 | fprintf_filtered (file, | |
416 | _("Debugger response to a program " | |
417 | "call of fork or vfork is \"%s\".\n"), | |
418 | value); | |
419 | } | |
420 | \f | |
421 | ||
422 | /* Tell the target to follow the fork we're stopped at. Returns true | |
423 | if the inferior should be resumed; false, if the target for some | |
424 | reason decided it's best not to resume. */ | |
425 | ||
426 | static int | |
427 | follow_fork (void) | |
428 | { | |
429 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); | |
430 | int should_resume = 1; | |
431 | struct thread_info *tp; | |
432 | ||
433 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
434 | followed fork child thread should have a copy of most of the | |
435 | parent thread structure's run control related fields, not just these. | |
436 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
437 | struct breakpoint *step_resume_breakpoint = NULL; | |
438 | struct breakpoint *exception_resume_breakpoint = NULL; | |
439 | CORE_ADDR step_range_start = 0; | |
440 | CORE_ADDR step_range_end = 0; | |
441 | struct frame_id step_frame_id = { 0 }; | |
442 | ||
443 | if (!non_stop) | |
444 | { | |
445 | ptid_t wait_ptid; | |
446 | struct target_waitstatus wait_status; | |
447 | ||
448 | /* Get the last target status returned by target_wait(). */ | |
449 | get_last_target_status (&wait_ptid, &wait_status); | |
450 | ||
451 | /* If not stopped at a fork event, then there's nothing else to | |
452 | do. */ | |
453 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
454 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
455 | return 1; | |
456 | ||
457 | /* Check if we switched over from WAIT_PTID, since the event was | |
458 | reported. */ | |
459 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
460 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
461 | { | |
462 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
463 | target to follow it (in either direction). We'll | |
464 | afterwards refuse to resume, and inform the user what | |
465 | happened. */ | |
466 | switch_to_thread (wait_ptid); | |
467 | should_resume = 0; | |
468 | } | |
469 | } | |
470 | ||
471 | tp = inferior_thread (); | |
472 | ||
473 | /* If there were any forks/vforks that were caught and are now to be | |
474 | followed, then do so now. */ | |
475 | switch (tp->pending_follow.kind) | |
476 | { | |
477 | case TARGET_WAITKIND_FORKED: | |
478 | case TARGET_WAITKIND_VFORKED: | |
479 | { | |
480 | ptid_t parent, child; | |
481 | ||
482 | /* If the user did a next/step, etc, over a fork call, | |
483 | preserve the stepping state in the fork child. */ | |
484 | if (follow_child && should_resume) | |
485 | { | |
486 | step_resume_breakpoint = clone_momentary_breakpoint | |
487 | (tp->control.step_resume_breakpoint); | |
488 | step_range_start = tp->control.step_range_start; | |
489 | step_range_end = tp->control.step_range_end; | |
490 | step_frame_id = tp->control.step_frame_id; | |
491 | exception_resume_breakpoint | |
492 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
493 | ||
494 | /* For now, delete the parent's sr breakpoint, otherwise, | |
495 | parent/child sr breakpoints are considered duplicates, | |
496 | and the child version will not be installed. Remove | |
497 | this when the breakpoints module becomes aware of | |
498 | inferiors and address spaces. */ | |
499 | delete_step_resume_breakpoint (tp); | |
500 | tp->control.step_range_start = 0; | |
501 | tp->control.step_range_end = 0; | |
502 | tp->control.step_frame_id = null_frame_id; | |
503 | delete_exception_resume_breakpoint (tp); | |
504 | } | |
505 | ||
506 | parent = inferior_ptid; | |
507 | child = tp->pending_follow.value.related_pid; | |
508 | ||
509 | /* Tell the target to do whatever is necessary to follow | |
510 | either parent or child. */ | |
511 | if (target_follow_fork (follow_child)) | |
512 | { | |
513 | /* Target refused to follow, or there's some other reason | |
514 | we shouldn't resume. */ | |
515 | should_resume = 0; | |
516 | } | |
517 | else | |
518 | { | |
519 | /* This pending follow fork event is now handled, one way | |
520 | or another. The previous selected thread may be gone | |
521 | from the lists by now, but if it is still around, need | |
522 | to clear the pending follow request. */ | |
523 | tp = find_thread_ptid (parent); | |
524 | if (tp) | |
525 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
526 | ||
527 | /* This makes sure we don't try to apply the "Switched | |
528 | over from WAIT_PID" logic above. */ | |
529 | nullify_last_target_wait_ptid (); | |
530 | ||
531 | /* If we followed the child, switch to it... */ | |
532 | if (follow_child) | |
533 | { | |
534 | switch_to_thread (child); | |
535 | ||
536 | /* ... and preserve the stepping state, in case the | |
537 | user was stepping over the fork call. */ | |
538 | if (should_resume) | |
539 | { | |
540 | tp = inferior_thread (); | |
541 | tp->control.step_resume_breakpoint | |
542 | = step_resume_breakpoint; | |
543 | tp->control.step_range_start = step_range_start; | |
544 | tp->control.step_range_end = step_range_end; | |
545 | tp->control.step_frame_id = step_frame_id; | |
546 | tp->control.exception_resume_breakpoint | |
547 | = exception_resume_breakpoint; | |
548 | } | |
549 | else | |
550 | { | |
551 | /* If we get here, it was because we're trying to | |
552 | resume from a fork catchpoint, but, the user | |
553 | has switched threads away from the thread that | |
554 | forked. In that case, the resume command | |
555 | issued is most likely not applicable to the | |
556 | child, so just warn, and refuse to resume. */ | |
557 | warning (_("Not resuming: switched threads " | |
558 | "before following fork child.\n")); | |
559 | } | |
560 | ||
561 | /* Reset breakpoints in the child as appropriate. */ | |
562 | follow_inferior_reset_breakpoints (); | |
563 | } | |
564 | else | |
565 | switch_to_thread (parent); | |
566 | } | |
567 | } | |
568 | break; | |
569 | case TARGET_WAITKIND_SPURIOUS: | |
570 | /* Nothing to follow. */ | |
571 | break; | |
572 | default: | |
573 | internal_error (__FILE__, __LINE__, | |
574 | "Unexpected pending_follow.kind %d\n", | |
575 | tp->pending_follow.kind); | |
576 | break; | |
577 | } | |
578 | ||
579 | return should_resume; | |
580 | } | |
581 | ||
582 | void | |
583 | follow_inferior_reset_breakpoints (void) | |
584 | { | |
585 | struct thread_info *tp = inferior_thread (); | |
586 | ||
587 | /* Was there a step_resume breakpoint? (There was if the user | |
588 | did a "next" at the fork() call.) If so, explicitly reset its | |
589 | thread number. | |
590 | ||
591 | step_resumes are a form of bp that are made to be per-thread. | |
592 | Since we created the step_resume bp when the parent process | |
593 | was being debugged, and now are switching to the child process, | |
594 | from the breakpoint package's viewpoint, that's a switch of | |
595 | "threads". We must update the bp's notion of which thread | |
596 | it is for, or it'll be ignored when it triggers. */ | |
597 | ||
598 | if (tp->control.step_resume_breakpoint) | |
599 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
600 | ||
601 | if (tp->control.exception_resume_breakpoint) | |
602 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
603 | ||
604 | /* Reinsert all breakpoints in the child. The user may have set | |
605 | breakpoints after catching the fork, in which case those | |
606 | were never set in the child, but only in the parent. This makes | |
607 | sure the inserted breakpoints match the breakpoint list. */ | |
608 | ||
609 | breakpoint_re_set (); | |
610 | insert_breakpoints (); | |
611 | } | |
612 | ||
613 | /* The child has exited or execed: resume threads of the parent the | |
614 | user wanted to be executing. */ | |
615 | ||
616 | static int | |
617 | proceed_after_vfork_done (struct thread_info *thread, | |
618 | void *arg) | |
619 | { | |
620 | int pid = * (int *) arg; | |
621 | ||
622 | if (ptid_get_pid (thread->ptid) == pid | |
623 | && is_running (thread->ptid) | |
624 | && !is_executing (thread->ptid) | |
625 | && !thread->stop_requested | |
626 | && thread->suspend.stop_signal == GDB_SIGNAL_0) | |
627 | { | |
628 | if (debug_infrun) | |
629 | fprintf_unfiltered (gdb_stdlog, | |
630 | "infrun: resuming vfork parent thread %s\n", | |
631 | target_pid_to_str (thread->ptid)); | |
632 | ||
633 | switch_to_thread (thread->ptid); | |
634 | clear_proceed_status (); | |
635 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT, 0); | |
636 | } | |
637 | ||
638 | return 0; | |
639 | } | |
640 | ||
641 | /* Called whenever we notice an exec or exit event, to handle | |
642 | detaching or resuming a vfork parent. */ | |
643 | ||
644 | static void | |
645 | handle_vfork_child_exec_or_exit (int exec) | |
646 | { | |
647 | struct inferior *inf = current_inferior (); | |
648 | ||
649 | if (inf->vfork_parent) | |
650 | { | |
651 | int resume_parent = -1; | |
652 | ||
653 | /* This exec or exit marks the end of the shared memory region | |
654 | between the parent and the child. If the user wanted to | |
655 | detach from the parent, now is the time. */ | |
656 | ||
657 | if (inf->vfork_parent->pending_detach) | |
658 | { | |
659 | struct thread_info *tp; | |
660 | struct cleanup *old_chain; | |
661 | struct program_space *pspace; | |
662 | struct address_space *aspace; | |
663 | ||
664 | /* follow-fork child, detach-on-fork on. */ | |
665 | ||
666 | old_chain = make_cleanup_restore_current_thread (); | |
667 | ||
668 | /* We're letting loose of the parent. */ | |
669 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
670 | switch_to_thread (tp->ptid); | |
671 | ||
672 | /* We're about to detach from the parent, which implicitly | |
673 | removes breakpoints from its address space. There's a | |
674 | catch here: we want to reuse the spaces for the child, | |
675 | but, parent/child are still sharing the pspace at this | |
676 | point, although the exec in reality makes the kernel give | |
677 | the child a fresh set of new pages. The problem here is | |
678 | that the breakpoints module being unaware of this, would | |
679 | likely chose the child process to write to the parent | |
680 | address space. Swapping the child temporarily away from | |
681 | the spaces has the desired effect. Yes, this is "sort | |
682 | of" a hack. */ | |
683 | ||
684 | pspace = inf->pspace; | |
685 | aspace = inf->aspace; | |
686 | inf->aspace = NULL; | |
687 | inf->pspace = NULL; | |
688 | ||
689 | if (debug_infrun || info_verbose) | |
690 | { | |
691 | target_terminal_ours (); | |
692 | ||
693 | if (exec) | |
694 | fprintf_filtered (gdb_stdlog, | |
695 | "Detaching vfork parent process " | |
696 | "%d after child exec.\n", | |
697 | inf->vfork_parent->pid); | |
698 | else | |
699 | fprintf_filtered (gdb_stdlog, | |
700 | "Detaching vfork parent process " | |
701 | "%d after child exit.\n", | |
702 | inf->vfork_parent->pid); | |
703 | } | |
704 | ||
705 | target_detach (NULL, 0); | |
706 | ||
707 | /* Put it back. */ | |
708 | inf->pspace = pspace; | |
709 | inf->aspace = aspace; | |
710 | ||
711 | do_cleanups (old_chain); | |
712 | } | |
713 | else if (exec) | |
714 | { | |
715 | /* We're staying attached to the parent, so, really give the | |
716 | child a new address space. */ | |
717 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
718 | inf->aspace = inf->pspace->aspace; | |
719 | inf->removable = 1; | |
720 | set_current_program_space (inf->pspace); | |
721 | ||
722 | resume_parent = inf->vfork_parent->pid; | |
723 | ||
724 | /* Break the bonds. */ | |
725 | inf->vfork_parent->vfork_child = NULL; | |
726 | } | |
727 | else | |
728 | { | |
729 | struct cleanup *old_chain; | |
730 | struct program_space *pspace; | |
731 | ||
732 | /* If this is a vfork child exiting, then the pspace and | |
733 | aspaces were shared with the parent. Since we're | |
734 | reporting the process exit, we'll be mourning all that is | |
735 | found in the address space, and switching to null_ptid, | |
736 | preparing to start a new inferior. But, since we don't | |
737 | want to clobber the parent's address/program spaces, we | |
738 | go ahead and create a new one for this exiting | |
739 | inferior. */ | |
740 | ||
741 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
742 | to read the selected frame of a dead process. */ | |
743 | old_chain = save_inferior_ptid (); | |
744 | inferior_ptid = null_ptid; | |
745 | ||
746 | /* This inferior is dead, so avoid giving the breakpoints | |
747 | module the option to write through to it (cloning a | |
748 | program space resets breakpoints). */ | |
749 | inf->aspace = NULL; | |
750 | inf->pspace = NULL; | |
751 | pspace = add_program_space (maybe_new_address_space ()); | |
752 | set_current_program_space (pspace); | |
753 | inf->removable = 1; | |
754 | inf->symfile_flags = SYMFILE_NO_READ; | |
755 | clone_program_space (pspace, inf->vfork_parent->pspace); | |
756 | inf->pspace = pspace; | |
757 | inf->aspace = pspace->aspace; | |
758 | ||
759 | /* Put back inferior_ptid. We'll continue mourning this | |
760 | inferior. */ | |
761 | do_cleanups (old_chain); | |
762 | ||
763 | resume_parent = inf->vfork_parent->pid; | |
764 | /* Break the bonds. */ | |
765 | inf->vfork_parent->vfork_child = NULL; | |
766 | } | |
767 | ||
768 | inf->vfork_parent = NULL; | |
769 | ||
770 | gdb_assert (current_program_space == inf->pspace); | |
771 | ||
772 | if (non_stop && resume_parent != -1) | |
773 | { | |
774 | /* If the user wanted the parent to be running, let it go | |
775 | free now. */ | |
776 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
777 | ||
778 | if (debug_infrun) | |
779 | fprintf_unfiltered (gdb_stdlog, | |
780 | "infrun: resuming vfork parent process %d\n", | |
781 | resume_parent); | |
782 | ||
783 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
784 | ||
785 | do_cleanups (old_chain); | |
786 | } | |
787 | } | |
788 | } | |
789 | ||
790 | /* Enum strings for "set|show displaced-stepping". */ | |
791 | ||
792 | static const char follow_exec_mode_new[] = "new"; | |
793 | static const char follow_exec_mode_same[] = "same"; | |
794 | static const char *const follow_exec_mode_names[] = | |
795 | { | |
796 | follow_exec_mode_new, | |
797 | follow_exec_mode_same, | |
798 | NULL, | |
799 | }; | |
800 | ||
801 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
802 | static void | |
803 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
804 | struct cmd_list_element *c, const char *value) | |
805 | { | |
806 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
807 | } | |
808 | ||
809 | /* EXECD_PATHNAME is assumed to be non-NULL. */ | |
810 | ||
811 | static void | |
812 | follow_exec (ptid_t pid, char *execd_pathname) | |
813 | { | |
814 | struct thread_info *th = inferior_thread (); | |
815 | struct inferior *inf = current_inferior (); | |
816 | ||
817 | /* This is an exec event that we actually wish to pay attention to. | |
818 | Refresh our symbol table to the newly exec'd program, remove any | |
819 | momentary bp's, etc. | |
820 | ||
821 | If there are breakpoints, they aren't really inserted now, | |
822 | since the exec() transformed our inferior into a fresh set | |
823 | of instructions. | |
824 | ||
825 | We want to preserve symbolic breakpoints on the list, since | |
826 | we have hopes that they can be reset after the new a.out's | |
827 | symbol table is read. | |
828 | ||
829 | However, any "raw" breakpoints must be removed from the list | |
830 | (e.g., the solib bp's), since their address is probably invalid | |
831 | now. | |
832 | ||
833 | And, we DON'T want to call delete_breakpoints() here, since | |
834 | that may write the bp's "shadow contents" (the instruction | |
835 | value that was overwritten witha TRAP instruction). Since | |
836 | we now have a new a.out, those shadow contents aren't valid. */ | |
837 | ||
838 | mark_breakpoints_out (); | |
839 | ||
840 | update_breakpoints_after_exec (); | |
841 | ||
842 | /* If there was one, it's gone now. We cannot truly step-to-next | |
843 | statement through an exec(). */ | |
844 | th->control.step_resume_breakpoint = NULL; | |
845 | th->control.exception_resume_breakpoint = NULL; | |
846 | th->control.step_range_start = 0; | |
847 | th->control.step_range_end = 0; | |
848 | ||
849 | /* The target reports the exec event to the main thread, even if | |
850 | some other thread does the exec, and even if the main thread was | |
851 | already stopped --- if debugging in non-stop mode, it's possible | |
852 | the user had the main thread held stopped in the previous image | |
853 | --- release it now. This is the same behavior as step-over-exec | |
854 | with scheduler-locking on in all-stop mode. */ | |
855 | th->stop_requested = 0; | |
856 | ||
857 | /* What is this a.out's name? */ | |
858 | printf_unfiltered (_("%s is executing new program: %s\n"), | |
859 | target_pid_to_str (inferior_ptid), | |
860 | execd_pathname); | |
861 | ||
862 | /* We've followed the inferior through an exec. Therefore, the | |
863 | inferior has essentially been killed & reborn. */ | |
864 | ||
865 | gdb_flush (gdb_stdout); | |
866 | ||
867 | breakpoint_init_inferior (inf_execd); | |
868 | ||
869 | if (gdb_sysroot && *gdb_sysroot) | |
870 | { | |
871 | char *name = alloca (strlen (gdb_sysroot) | |
872 | + strlen (execd_pathname) | |
873 | + 1); | |
874 | ||
875 | strcpy (name, gdb_sysroot); | |
876 | strcat (name, execd_pathname); | |
877 | execd_pathname = name; | |
878 | } | |
879 | ||
880 | /* Reset the shared library package. This ensures that we get a | |
881 | shlib event when the child reaches "_start", at which point the | |
882 | dld will have had a chance to initialize the child. */ | |
883 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
884 | we don't want those to be satisfied by the libraries of the | |
885 | previous incarnation of this process. */ | |
886 | no_shared_libraries (NULL, 0); | |
887 | ||
888 | if (follow_exec_mode_string == follow_exec_mode_new) | |
889 | { | |
890 | struct program_space *pspace; | |
891 | ||
892 | /* The user wants to keep the old inferior and program spaces | |
893 | around. Create a new fresh one, and switch to it. */ | |
894 | ||
895 | inf = add_inferior (current_inferior ()->pid); | |
896 | pspace = add_program_space (maybe_new_address_space ()); | |
897 | inf->pspace = pspace; | |
898 | inf->aspace = pspace->aspace; | |
899 | ||
900 | exit_inferior_num_silent (current_inferior ()->num); | |
901 | ||
902 | set_current_inferior (inf); | |
903 | set_current_program_space (pspace); | |
904 | } | |
905 | ||
906 | gdb_assert (current_program_space == inf->pspace); | |
907 | ||
908 | /* That a.out is now the one to use. */ | |
909 | exec_file_attach (execd_pathname, 0); | |
910 | ||
911 | /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE | |
912 | (Position Independent Executable) main symbol file will get applied by | |
913 | solib_create_inferior_hook below. breakpoint_re_set would fail to insert | |
914 | the breakpoints with the zero displacement. */ | |
915 | ||
916 | symbol_file_add (execd_pathname, | |
917 | (inf->symfile_flags | |
918 | | SYMFILE_MAINLINE | SYMFILE_DEFER_BP_RESET), | |
919 | NULL, 0); | |
920 | ||
921 | if ((inf->symfile_flags & SYMFILE_NO_READ) == 0) | |
922 | set_initial_language (); | |
923 | ||
924 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
925 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); | |
926 | #else | |
927 | solib_create_inferior_hook (0); | |
928 | #endif | |
929 | ||
930 | jit_inferior_created_hook (); | |
931 | ||
932 | breakpoint_re_set (); | |
933 | ||
934 | /* Reinsert all breakpoints. (Those which were symbolic have | |
935 | been reset to the proper address in the new a.out, thanks | |
936 | to symbol_file_command...). */ | |
937 | insert_breakpoints (); | |
938 | ||
939 | /* The next resume of this inferior should bring it to the shlib | |
940 | startup breakpoints. (If the user had also set bp's on | |
941 | "main" from the old (parent) process, then they'll auto- | |
942 | matically get reset there in the new process.). */ | |
943 | } | |
944 | ||
945 | /* Non-zero if we just simulating a single-step. This is needed | |
946 | because we cannot remove the breakpoints in the inferior process | |
947 | until after the `wait' in `wait_for_inferior'. */ | |
948 | static int singlestep_breakpoints_inserted_p = 0; | |
949 | ||
950 | /* The thread we inserted single-step breakpoints for. */ | |
951 | static ptid_t singlestep_ptid; | |
952 | ||
953 | /* PC when we started this single-step. */ | |
954 | static CORE_ADDR singlestep_pc; | |
955 | ||
956 | /* If another thread hit the singlestep breakpoint, we save the original | |
957 | thread here so that we can resume single-stepping it later. */ | |
958 | static ptid_t saved_singlestep_ptid; | |
959 | static int stepping_past_singlestep_breakpoint; | |
960 | ||
961 | /* If not equal to null_ptid, this means that after stepping over breakpoint | |
962 | is finished, we need to switch to deferred_step_ptid, and step it. | |
963 | ||
964 | The use case is when one thread has hit a breakpoint, and then the user | |
965 | has switched to another thread and issued 'step'. We need to step over | |
966 | breakpoint in the thread which hit the breakpoint, but then continue | |
967 | stepping the thread user has selected. */ | |
968 | static ptid_t deferred_step_ptid; | |
969 | \f | |
970 | /* Displaced stepping. */ | |
971 | ||
972 | /* In non-stop debugging mode, we must take special care to manage | |
973 | breakpoints properly; in particular, the traditional strategy for | |
974 | stepping a thread past a breakpoint it has hit is unsuitable. | |
975 | 'Displaced stepping' is a tactic for stepping one thread past a | |
976 | breakpoint it has hit while ensuring that other threads running | |
977 | concurrently will hit the breakpoint as they should. | |
978 | ||
979 | The traditional way to step a thread T off a breakpoint in a | |
980 | multi-threaded program in all-stop mode is as follows: | |
981 | ||
982 | a0) Initially, all threads are stopped, and breakpoints are not | |
983 | inserted. | |
984 | a1) We single-step T, leaving breakpoints uninserted. | |
985 | a2) We insert breakpoints, and resume all threads. | |
986 | ||
987 | In non-stop debugging, however, this strategy is unsuitable: we | |
988 | don't want to have to stop all threads in the system in order to | |
989 | continue or step T past a breakpoint. Instead, we use displaced | |
990 | stepping: | |
991 | ||
992 | n0) Initially, T is stopped, other threads are running, and | |
993 | breakpoints are inserted. | |
994 | n1) We copy the instruction "under" the breakpoint to a separate | |
995 | location, outside the main code stream, making any adjustments | |
996 | to the instruction, register, and memory state as directed by | |
997 | T's architecture. | |
998 | n2) We single-step T over the instruction at its new location. | |
999 | n3) We adjust the resulting register and memory state as directed | |
1000 | by T's architecture. This includes resetting T's PC to point | |
1001 | back into the main instruction stream. | |
1002 | n4) We resume T. | |
1003 | ||
1004 | This approach depends on the following gdbarch methods: | |
1005 | ||
1006 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1007 | indicate where to copy the instruction, and how much space must | |
1008 | be reserved there. We use these in step n1. | |
1009 | ||
1010 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1011 | address, and makes any necessary adjustments to the instruction, | |
1012 | register contents, and memory. We use this in step n1. | |
1013 | ||
1014 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1015 | we have successfuly single-stepped the instruction, to yield the | |
1016 | same effect the instruction would have had if we had executed it | |
1017 | at its original address. We use this in step n3. | |
1018 | ||
1019 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1020 | ||
1021 | The gdbarch_displaced_step_copy_insn and | |
1022 | gdbarch_displaced_step_fixup functions must be written so that | |
1023 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1024 | single-stepping across the copied instruction, and then applying | |
1025 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1026 | thread's memory and registers as stepping the instruction in place | |
1027 | would have. Exactly which responsibilities fall to the copy and | |
1028 | which fall to the fixup is up to the author of those functions. | |
1029 | ||
1030 | See the comments in gdbarch.sh for details. | |
1031 | ||
1032 | Note that displaced stepping and software single-step cannot | |
1033 | currently be used in combination, although with some care I think | |
1034 | they could be made to. Software single-step works by placing | |
1035 | breakpoints on all possible subsequent instructions; if the | |
1036 | displaced instruction is a PC-relative jump, those breakpoints | |
1037 | could fall in very strange places --- on pages that aren't | |
1038 | executable, or at addresses that are not proper instruction | |
1039 | boundaries. (We do generally let other threads run while we wait | |
1040 | to hit the software single-step breakpoint, and they might | |
1041 | encounter such a corrupted instruction.) One way to work around | |
1042 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1043 | simulate the effect of PC-relative instructions (and return NULL) | |
1044 | on architectures that use software single-stepping. | |
1045 | ||
1046 | In non-stop mode, we can have independent and simultaneous step | |
1047 | requests, so more than one thread may need to simultaneously step | |
1048 | over a breakpoint. The current implementation assumes there is | |
1049 | only one scratch space per process. In this case, we have to | |
1050 | serialize access to the scratch space. If thread A wants to step | |
1051 | over a breakpoint, but we are currently waiting for some other | |
1052 | thread to complete a displaced step, we leave thread A stopped and | |
1053 | place it in the displaced_step_request_queue. Whenever a displaced | |
1054 | step finishes, we pick the next thread in the queue and start a new | |
1055 | displaced step operation on it. See displaced_step_prepare and | |
1056 | displaced_step_fixup for details. */ | |
1057 | ||
1058 | struct displaced_step_request | |
1059 | { | |
1060 | ptid_t ptid; | |
1061 | struct displaced_step_request *next; | |
1062 | }; | |
1063 | ||
1064 | /* Per-inferior displaced stepping state. */ | |
1065 | struct displaced_step_inferior_state | |
1066 | { | |
1067 | /* Pointer to next in linked list. */ | |
1068 | struct displaced_step_inferior_state *next; | |
1069 | ||
1070 | /* The process this displaced step state refers to. */ | |
1071 | int pid; | |
1072 | ||
1073 | /* A queue of pending displaced stepping requests. One entry per | |
1074 | thread that needs to do a displaced step. */ | |
1075 | struct displaced_step_request *step_request_queue; | |
1076 | ||
1077 | /* If this is not null_ptid, this is the thread carrying out a | |
1078 | displaced single-step in process PID. This thread's state will | |
1079 | require fixing up once it has completed its step. */ | |
1080 | ptid_t step_ptid; | |
1081 | ||
1082 | /* The architecture the thread had when we stepped it. */ | |
1083 | struct gdbarch *step_gdbarch; | |
1084 | ||
1085 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1086 | for post-step cleanup. */ | |
1087 | struct displaced_step_closure *step_closure; | |
1088 | ||
1089 | /* The address of the original instruction, and the copy we | |
1090 | made. */ | |
1091 | CORE_ADDR step_original, step_copy; | |
1092 | ||
1093 | /* Saved contents of copy area. */ | |
1094 | gdb_byte *step_saved_copy; | |
1095 | }; | |
1096 | ||
1097 | /* The list of states of processes involved in displaced stepping | |
1098 | presently. */ | |
1099 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1100 | ||
1101 | /* Get the displaced stepping state of process PID. */ | |
1102 | ||
1103 | static struct displaced_step_inferior_state * | |
1104 | get_displaced_stepping_state (int pid) | |
1105 | { | |
1106 | struct displaced_step_inferior_state *state; | |
1107 | ||
1108 | for (state = displaced_step_inferior_states; | |
1109 | state != NULL; | |
1110 | state = state->next) | |
1111 | if (state->pid == pid) | |
1112 | return state; | |
1113 | ||
1114 | return NULL; | |
1115 | } | |
1116 | ||
1117 | /* Add a new displaced stepping state for process PID to the displaced | |
1118 | stepping state list, or return a pointer to an already existing | |
1119 | entry, if it already exists. Never returns NULL. */ | |
1120 | ||
1121 | static struct displaced_step_inferior_state * | |
1122 | add_displaced_stepping_state (int pid) | |
1123 | { | |
1124 | struct displaced_step_inferior_state *state; | |
1125 | ||
1126 | for (state = displaced_step_inferior_states; | |
1127 | state != NULL; | |
1128 | state = state->next) | |
1129 | if (state->pid == pid) | |
1130 | return state; | |
1131 | ||
1132 | state = xcalloc (1, sizeof (*state)); | |
1133 | state->pid = pid; | |
1134 | state->next = displaced_step_inferior_states; | |
1135 | displaced_step_inferior_states = state; | |
1136 | ||
1137 | return state; | |
1138 | } | |
1139 | ||
1140 | /* If inferior is in displaced stepping, and ADDR equals to starting address | |
1141 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1142 | return NULL. */ | |
1143 | ||
1144 | struct displaced_step_closure* | |
1145 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1146 | { | |
1147 | struct displaced_step_inferior_state *displaced | |
1148 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1149 | ||
1150 | /* If checking the mode of displaced instruction in copy area. */ | |
1151 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1152 | && (displaced->step_copy == addr)) | |
1153 | return displaced->step_closure; | |
1154 | ||
1155 | return NULL; | |
1156 | } | |
1157 | ||
1158 | /* Remove the displaced stepping state of process PID. */ | |
1159 | ||
1160 | static void | |
1161 | remove_displaced_stepping_state (int pid) | |
1162 | { | |
1163 | struct displaced_step_inferior_state *it, **prev_next_p; | |
1164 | ||
1165 | gdb_assert (pid != 0); | |
1166 | ||
1167 | it = displaced_step_inferior_states; | |
1168 | prev_next_p = &displaced_step_inferior_states; | |
1169 | while (it) | |
1170 | { | |
1171 | if (it->pid == pid) | |
1172 | { | |
1173 | *prev_next_p = it->next; | |
1174 | xfree (it); | |
1175 | return; | |
1176 | } | |
1177 | ||
1178 | prev_next_p = &it->next; | |
1179 | it = *prev_next_p; | |
1180 | } | |
1181 | } | |
1182 | ||
1183 | static void | |
1184 | infrun_inferior_exit (struct inferior *inf) | |
1185 | { | |
1186 | remove_displaced_stepping_state (inf->pid); | |
1187 | } | |
1188 | ||
1189 | /* If ON, and the architecture supports it, GDB will use displaced | |
1190 | stepping to step over breakpoints. If OFF, or if the architecture | |
1191 | doesn't support it, GDB will instead use the traditional | |
1192 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1193 | decide which technique to use to step over breakpoints depending on | |
1194 | which of all-stop or non-stop mode is active --- displaced stepping | |
1195 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1196 | ||
1197 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; | |
1198 | ||
1199 | static void | |
1200 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1201 | struct cmd_list_element *c, | |
1202 | const char *value) | |
1203 | { | |
1204 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) | |
1205 | fprintf_filtered (file, | |
1206 | _("Debugger's willingness to use displaced stepping " | |
1207 | "to step over breakpoints is %s (currently %s).\n"), | |
1208 | value, non_stop ? "on" : "off"); | |
1209 | else | |
1210 | fprintf_filtered (file, | |
1211 | _("Debugger's willingness to use displaced stepping " | |
1212 | "to step over breakpoints is %s.\n"), value); | |
1213 | } | |
1214 | ||
1215 | /* Return non-zero if displaced stepping can/should be used to step | |
1216 | over breakpoints. */ | |
1217 | ||
1218 | static int | |
1219 | use_displaced_stepping (struct gdbarch *gdbarch) | |
1220 | { | |
1221 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO && non_stop) | |
1222 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1223 | && gdbarch_displaced_step_copy_insn_p (gdbarch) | |
1224 | && !RECORD_IS_USED); | |
1225 | } | |
1226 | ||
1227 | /* Clean out any stray displaced stepping state. */ | |
1228 | static void | |
1229 | displaced_step_clear (struct displaced_step_inferior_state *displaced) | |
1230 | { | |
1231 | /* Indicate that there is no cleanup pending. */ | |
1232 | displaced->step_ptid = null_ptid; | |
1233 | ||
1234 | if (displaced->step_closure) | |
1235 | { | |
1236 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, | |
1237 | displaced->step_closure); | |
1238 | displaced->step_closure = NULL; | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | static void | |
1243 | displaced_step_clear_cleanup (void *arg) | |
1244 | { | |
1245 | struct displaced_step_inferior_state *state = arg; | |
1246 | ||
1247 | displaced_step_clear (state); | |
1248 | } | |
1249 | ||
1250 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1251 | void | |
1252 | displaced_step_dump_bytes (struct ui_file *file, | |
1253 | const gdb_byte *buf, | |
1254 | size_t len) | |
1255 | { | |
1256 | int i; | |
1257 | ||
1258 | for (i = 0; i < len; i++) | |
1259 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1260 | fputs_unfiltered ("\n", file); | |
1261 | } | |
1262 | ||
1263 | /* Prepare to single-step, using displaced stepping. | |
1264 | ||
1265 | Note that we cannot use displaced stepping when we have a signal to | |
1266 | deliver. If we have a signal to deliver and an instruction to step | |
1267 | over, then after the step, there will be no indication from the | |
1268 | target whether the thread entered a signal handler or ignored the | |
1269 | signal and stepped over the instruction successfully --- both cases | |
1270 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1271 | fixup, and in the second case we must --- but we can't tell which. | |
1272 | Comments in the code for 'random signals' in handle_inferior_event | |
1273 | explain how we handle this case instead. | |
1274 | ||
1275 | Returns 1 if preparing was successful -- this thread is going to be | |
1276 | stepped now; or 0 if displaced stepping this thread got queued. */ | |
1277 | static int | |
1278 | displaced_step_prepare (ptid_t ptid) | |
1279 | { | |
1280 | struct cleanup *old_cleanups, *ignore_cleanups; | |
1281 | struct regcache *regcache = get_thread_regcache (ptid); | |
1282 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1283 | CORE_ADDR original, copy; | |
1284 | ULONGEST len; | |
1285 | struct displaced_step_closure *closure; | |
1286 | struct displaced_step_inferior_state *displaced; | |
1287 | int status; | |
1288 | ||
1289 | /* We should never reach this function if the architecture does not | |
1290 | support displaced stepping. */ | |
1291 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1292 | ||
1293 | /* We have to displaced step one thread at a time, as we only have | |
1294 | access to a single scratch space per inferior. */ | |
1295 | ||
1296 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); | |
1297 | ||
1298 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
1299 | { | |
1300 | /* Already waiting for a displaced step to finish. Defer this | |
1301 | request and place in queue. */ | |
1302 | struct displaced_step_request *req, *new_req; | |
1303 | ||
1304 | if (debug_displaced) | |
1305 | fprintf_unfiltered (gdb_stdlog, | |
1306 | "displaced: defering step of %s\n", | |
1307 | target_pid_to_str (ptid)); | |
1308 | ||
1309 | new_req = xmalloc (sizeof (*new_req)); | |
1310 | new_req->ptid = ptid; | |
1311 | new_req->next = NULL; | |
1312 | ||
1313 | if (displaced->step_request_queue) | |
1314 | { | |
1315 | for (req = displaced->step_request_queue; | |
1316 | req && req->next; | |
1317 | req = req->next) | |
1318 | ; | |
1319 | req->next = new_req; | |
1320 | } | |
1321 | else | |
1322 | displaced->step_request_queue = new_req; | |
1323 | ||
1324 | return 0; | |
1325 | } | |
1326 | else | |
1327 | { | |
1328 | if (debug_displaced) | |
1329 | fprintf_unfiltered (gdb_stdlog, | |
1330 | "displaced: stepping %s now\n", | |
1331 | target_pid_to_str (ptid)); | |
1332 | } | |
1333 | ||
1334 | displaced_step_clear (displaced); | |
1335 | ||
1336 | old_cleanups = save_inferior_ptid (); | |
1337 | inferior_ptid = ptid; | |
1338 | ||
1339 | original = regcache_read_pc (regcache); | |
1340 | ||
1341 | copy = gdbarch_displaced_step_location (gdbarch); | |
1342 | len = gdbarch_max_insn_length (gdbarch); | |
1343 | ||
1344 | /* Save the original contents of the copy area. */ | |
1345 | displaced->step_saved_copy = xmalloc (len); | |
1346 | ignore_cleanups = make_cleanup (free_current_contents, | |
1347 | &displaced->step_saved_copy); | |
1348 | status = target_read_memory (copy, displaced->step_saved_copy, len); | |
1349 | if (status != 0) | |
1350 | throw_error (MEMORY_ERROR, | |
1351 | _("Error accessing memory address %s (%s) for " | |
1352 | "displaced-stepping scratch space."), | |
1353 | paddress (gdbarch, copy), safe_strerror (status)); | |
1354 | if (debug_displaced) | |
1355 | { | |
1356 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", | |
1357 | paddress (gdbarch, copy)); | |
1358 | displaced_step_dump_bytes (gdb_stdlog, | |
1359 | displaced->step_saved_copy, | |
1360 | len); | |
1361 | }; | |
1362 | ||
1363 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
1364 | original, copy, regcache); | |
1365 | ||
1366 | /* We don't support the fully-simulated case at present. */ | |
1367 | gdb_assert (closure); | |
1368 | ||
1369 | /* Save the information we need to fix things up if the step | |
1370 | succeeds. */ | |
1371 | displaced->step_ptid = ptid; | |
1372 | displaced->step_gdbarch = gdbarch; | |
1373 | displaced->step_closure = closure; | |
1374 | displaced->step_original = original; | |
1375 | displaced->step_copy = copy; | |
1376 | ||
1377 | make_cleanup (displaced_step_clear_cleanup, displaced); | |
1378 | ||
1379 | /* Resume execution at the copy. */ | |
1380 | regcache_write_pc (regcache, copy); | |
1381 | ||
1382 | discard_cleanups (ignore_cleanups); | |
1383 | ||
1384 | do_cleanups (old_cleanups); | |
1385 | ||
1386 | if (debug_displaced) | |
1387 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", | |
1388 | paddress (gdbarch, copy)); | |
1389 | ||
1390 | return 1; | |
1391 | } | |
1392 | ||
1393 | static void | |
1394 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, | |
1395 | const gdb_byte *myaddr, int len) | |
1396 | { | |
1397 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
1398 | ||
1399 | inferior_ptid = ptid; | |
1400 | write_memory (memaddr, myaddr, len); | |
1401 | do_cleanups (ptid_cleanup); | |
1402 | } | |
1403 | ||
1404 | /* Restore the contents of the copy area for thread PTID. */ | |
1405 | ||
1406 | static void | |
1407 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1408 | ptid_t ptid) | |
1409 | { | |
1410 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1411 | ||
1412 | write_memory_ptid (ptid, displaced->step_copy, | |
1413 | displaced->step_saved_copy, len); | |
1414 | if (debug_displaced) | |
1415 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1416 | target_pid_to_str (ptid), | |
1417 | paddress (displaced->step_gdbarch, | |
1418 | displaced->step_copy)); | |
1419 | } | |
1420 | ||
1421 | static void | |
1422 | displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal) | |
1423 | { | |
1424 | struct cleanup *old_cleanups; | |
1425 | struct displaced_step_inferior_state *displaced | |
1426 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
1427 | ||
1428 | /* Was any thread of this process doing a displaced step? */ | |
1429 | if (displaced == NULL) | |
1430 | return; | |
1431 | ||
1432 | /* Was this event for the pid we displaced? */ | |
1433 | if (ptid_equal (displaced->step_ptid, null_ptid) | |
1434 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
1435 | return; | |
1436 | ||
1437 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); | |
1438 | ||
1439 | displaced_step_restore (displaced, displaced->step_ptid); | |
1440 | ||
1441 | /* Did the instruction complete successfully? */ | |
1442 | if (signal == GDB_SIGNAL_TRAP) | |
1443 | { | |
1444 | /* Fix up the resulting state. */ | |
1445 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, | |
1446 | displaced->step_closure, | |
1447 | displaced->step_original, | |
1448 | displaced->step_copy, | |
1449 | get_thread_regcache (displaced->step_ptid)); | |
1450 | } | |
1451 | else | |
1452 | { | |
1453 | /* Since the instruction didn't complete, all we can do is | |
1454 | relocate the PC. */ | |
1455 | struct regcache *regcache = get_thread_regcache (event_ptid); | |
1456 | CORE_ADDR pc = regcache_read_pc (regcache); | |
1457 | ||
1458 | pc = displaced->step_original + (pc - displaced->step_copy); | |
1459 | regcache_write_pc (regcache, pc); | |
1460 | } | |
1461 | ||
1462 | do_cleanups (old_cleanups); | |
1463 | ||
1464 | displaced->step_ptid = null_ptid; | |
1465 | ||
1466 | /* Are there any pending displaced stepping requests? If so, run | |
1467 | one now. Leave the state object around, since we're likely to | |
1468 | need it again soon. */ | |
1469 | while (displaced->step_request_queue) | |
1470 | { | |
1471 | struct displaced_step_request *head; | |
1472 | ptid_t ptid; | |
1473 | struct regcache *regcache; | |
1474 | struct gdbarch *gdbarch; | |
1475 | CORE_ADDR actual_pc; | |
1476 | struct address_space *aspace; | |
1477 | ||
1478 | head = displaced->step_request_queue; | |
1479 | ptid = head->ptid; | |
1480 | displaced->step_request_queue = head->next; | |
1481 | xfree (head); | |
1482 | ||
1483 | context_switch (ptid); | |
1484 | ||
1485 | regcache = get_thread_regcache (ptid); | |
1486 | actual_pc = regcache_read_pc (regcache); | |
1487 | aspace = get_regcache_aspace (regcache); | |
1488 | ||
1489 | if (breakpoint_here_p (aspace, actual_pc)) | |
1490 | { | |
1491 | if (debug_displaced) | |
1492 | fprintf_unfiltered (gdb_stdlog, | |
1493 | "displaced: stepping queued %s now\n", | |
1494 | target_pid_to_str (ptid)); | |
1495 | ||
1496 | displaced_step_prepare (ptid); | |
1497 | ||
1498 | gdbarch = get_regcache_arch (regcache); | |
1499 | ||
1500 | if (debug_displaced) | |
1501 | { | |
1502 | CORE_ADDR actual_pc = regcache_read_pc (regcache); | |
1503 | gdb_byte buf[4]; | |
1504 | ||
1505 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
1506 | paddress (gdbarch, actual_pc)); | |
1507 | read_memory (actual_pc, buf, sizeof (buf)); | |
1508 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1509 | } | |
1510 | ||
1511 | if (gdbarch_displaced_step_hw_singlestep (gdbarch, | |
1512 | displaced->step_closure)) | |
1513 | target_resume (ptid, 1, GDB_SIGNAL_0); | |
1514 | else | |
1515 | target_resume (ptid, 0, GDB_SIGNAL_0); | |
1516 | ||
1517 | /* Done, we're stepping a thread. */ | |
1518 | break; | |
1519 | } | |
1520 | else | |
1521 | { | |
1522 | int step; | |
1523 | struct thread_info *tp = inferior_thread (); | |
1524 | ||
1525 | /* The breakpoint we were sitting under has since been | |
1526 | removed. */ | |
1527 | tp->control.trap_expected = 0; | |
1528 | ||
1529 | /* Go back to what we were trying to do. */ | |
1530 | step = currently_stepping (tp); | |
1531 | ||
1532 | if (debug_displaced) | |
1533 | fprintf_unfiltered (gdb_stdlog, | |
1534 | "displaced: breakpoint is gone: %s, step(%d)\n", | |
1535 | target_pid_to_str (tp->ptid), step); | |
1536 | ||
1537 | target_resume (ptid, step, GDB_SIGNAL_0); | |
1538 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
1539 | ||
1540 | /* This request was discarded. See if there's any other | |
1541 | thread waiting for its turn. */ | |
1542 | } | |
1543 | } | |
1544 | } | |
1545 | ||
1546 | /* Update global variables holding ptids to hold NEW_PTID if they were | |
1547 | holding OLD_PTID. */ | |
1548 | static void | |
1549 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
1550 | { | |
1551 | struct displaced_step_request *it; | |
1552 | struct displaced_step_inferior_state *displaced; | |
1553 | ||
1554 | if (ptid_equal (inferior_ptid, old_ptid)) | |
1555 | inferior_ptid = new_ptid; | |
1556 | ||
1557 | if (ptid_equal (singlestep_ptid, old_ptid)) | |
1558 | singlestep_ptid = new_ptid; | |
1559 | ||
1560 | if (ptid_equal (deferred_step_ptid, old_ptid)) | |
1561 | deferred_step_ptid = new_ptid; | |
1562 | ||
1563 | for (displaced = displaced_step_inferior_states; | |
1564 | displaced; | |
1565 | displaced = displaced->next) | |
1566 | { | |
1567 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
1568 | displaced->step_ptid = new_ptid; | |
1569 | ||
1570 | for (it = displaced->step_request_queue; it; it = it->next) | |
1571 | if (ptid_equal (it->ptid, old_ptid)) | |
1572 | it->ptid = new_ptid; | |
1573 | } | |
1574 | } | |
1575 | ||
1576 | \f | |
1577 | /* Resuming. */ | |
1578 | ||
1579 | /* Things to clean up if we QUIT out of resume (). */ | |
1580 | static void | |
1581 | resume_cleanups (void *ignore) | |
1582 | { | |
1583 | normal_stop (); | |
1584 | } | |
1585 | ||
1586 | static const char schedlock_off[] = "off"; | |
1587 | static const char schedlock_on[] = "on"; | |
1588 | static const char schedlock_step[] = "step"; | |
1589 | static const char *const scheduler_enums[] = { | |
1590 | schedlock_off, | |
1591 | schedlock_on, | |
1592 | schedlock_step, | |
1593 | NULL | |
1594 | }; | |
1595 | static const char *scheduler_mode = schedlock_off; | |
1596 | static void | |
1597 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
1598 | struct cmd_list_element *c, const char *value) | |
1599 | { | |
1600 | fprintf_filtered (file, | |
1601 | _("Mode for locking scheduler " | |
1602 | "during execution is \"%s\".\n"), | |
1603 | value); | |
1604 | } | |
1605 | ||
1606 | static void | |
1607 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) | |
1608 | { | |
1609 | if (!target_can_lock_scheduler) | |
1610 | { | |
1611 | scheduler_mode = schedlock_off; | |
1612 | error (_("Target '%s' cannot support this command."), target_shortname); | |
1613 | } | |
1614 | } | |
1615 | ||
1616 | /* True if execution commands resume all threads of all processes by | |
1617 | default; otherwise, resume only threads of the current inferior | |
1618 | process. */ | |
1619 | int sched_multi = 0; | |
1620 | ||
1621 | /* Try to setup for software single stepping over the specified location. | |
1622 | Return 1 if target_resume() should use hardware single step. | |
1623 | ||
1624 | GDBARCH the current gdbarch. | |
1625 | PC the location to step over. */ | |
1626 | ||
1627 | static int | |
1628 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1629 | { | |
1630 | int hw_step = 1; | |
1631 | ||
1632 | if (execution_direction == EXEC_FORWARD | |
1633 | && gdbarch_software_single_step_p (gdbarch) | |
1634 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) | |
1635 | { | |
1636 | hw_step = 0; | |
1637 | /* Do not pull these breakpoints until after a `wait' in | |
1638 | `wait_for_inferior'. */ | |
1639 | singlestep_breakpoints_inserted_p = 1; | |
1640 | singlestep_ptid = inferior_ptid; | |
1641 | singlestep_pc = pc; | |
1642 | } | |
1643 | return hw_step; | |
1644 | } | |
1645 | ||
1646 | /* Return a ptid representing the set of threads that we will proceed, | |
1647 | in the perspective of the user/frontend. We may actually resume | |
1648 | fewer threads at first, e.g., if a thread is stopped at a | |
1649 | breakpoint that needs stepping-off, but that should not be visible | |
1650 | to the user/frontend, and neither should the frontend/user be | |
1651 | allowed to proceed any of the threads that happen to be stopped for | |
1652 | internal run control handling, if a previous command wanted them | |
1653 | resumed. */ | |
1654 | ||
1655 | ptid_t | |
1656 | user_visible_resume_ptid (int step) | |
1657 | { | |
1658 | /* By default, resume all threads of all processes. */ | |
1659 | ptid_t resume_ptid = RESUME_ALL; | |
1660 | ||
1661 | /* Maybe resume only all threads of the current process. */ | |
1662 | if (!sched_multi && target_supports_multi_process ()) | |
1663 | { | |
1664 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
1665 | } | |
1666 | ||
1667 | /* Maybe resume a single thread after all. */ | |
1668 | if (non_stop) | |
1669 | { | |
1670 | /* With non-stop mode on, threads are always handled | |
1671 | individually. */ | |
1672 | resume_ptid = inferior_ptid; | |
1673 | } | |
1674 | else if ((scheduler_mode == schedlock_on) | |
1675 | || (scheduler_mode == schedlock_step | |
1676 | && (step || singlestep_breakpoints_inserted_p))) | |
1677 | { | |
1678 | /* User-settable 'scheduler' mode requires solo thread resume. */ | |
1679 | resume_ptid = inferior_ptid; | |
1680 | } | |
1681 | ||
1682 | return resume_ptid; | |
1683 | } | |
1684 | ||
1685 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
1686 | wants to interrupt some lengthy single-stepping operation | |
1687 | (for child processes, the SIGINT goes to the inferior, and so | |
1688 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
1689 | other targets, that's not true). | |
1690 | ||
1691 | STEP nonzero if we should step (zero to continue instead). | |
1692 | SIG is the signal to give the inferior (zero for none). */ | |
1693 | void | |
1694 | resume (int step, enum gdb_signal sig) | |
1695 | { | |
1696 | int should_resume = 1; | |
1697 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
1698 | struct regcache *regcache = get_current_regcache (); | |
1699 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1700 | struct thread_info *tp = inferior_thread (); | |
1701 | CORE_ADDR pc = regcache_read_pc (regcache); | |
1702 | struct address_space *aspace = get_regcache_aspace (regcache); | |
1703 | ||
1704 | QUIT; | |
1705 | ||
1706 | if (current_inferior ()->waiting_for_vfork_done) | |
1707 | { | |
1708 | /* Don't try to single-step a vfork parent that is waiting for | |
1709 | the child to get out of the shared memory region (by exec'ing | |
1710 | or exiting). This is particularly important on software | |
1711 | single-step archs, as the child process would trip on the | |
1712 | software single step breakpoint inserted for the parent | |
1713 | process. Since the parent will not actually execute any | |
1714 | instruction until the child is out of the shared region (such | |
1715 | are vfork's semantics), it is safe to simply continue it. | |
1716 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
1717 | the parent, and tell it to `keep_going', which automatically | |
1718 | re-sets it stepping. */ | |
1719 | if (debug_infrun) | |
1720 | fprintf_unfiltered (gdb_stdlog, | |
1721 | "infrun: resume : clear step\n"); | |
1722 | step = 0; | |
1723 | } | |
1724 | ||
1725 | if (debug_infrun) | |
1726 | fprintf_unfiltered (gdb_stdlog, | |
1727 | "infrun: resume (step=%d, signal=%d), " | |
1728 | "trap_expected=%d, current thread [%s] at %s\n", | |
1729 | step, sig, tp->control.trap_expected, | |
1730 | target_pid_to_str (inferior_ptid), | |
1731 | paddress (gdbarch, pc)); | |
1732 | ||
1733 | /* Normally, by the time we reach `resume', the breakpoints are either | |
1734 | removed or inserted, as appropriate. The exception is if we're sitting | |
1735 | at a permanent breakpoint; we need to step over it, but permanent | |
1736 | breakpoints can't be removed. So we have to test for it here. */ | |
1737 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) | |
1738 | { | |
1739 | if (gdbarch_skip_permanent_breakpoint_p (gdbarch)) | |
1740 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
1741 | else | |
1742 | error (_("\ | |
1743 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
1744 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
1745 | a command like `return' or `jump' to continue execution.")); | |
1746 | } | |
1747 | ||
1748 | /* If enabled, step over breakpoints by executing a copy of the | |
1749 | instruction at a different address. | |
1750 | ||
1751 | We can't use displaced stepping when we have a signal to deliver; | |
1752 | the comments for displaced_step_prepare explain why. The | |
1753 | comments in the handle_inferior event for dealing with 'random | |
1754 | signals' explain what we do instead. | |
1755 | ||
1756 | We can't use displaced stepping when we are waiting for vfork_done | |
1757 | event, displaced stepping breaks the vfork child similarly as single | |
1758 | step software breakpoint. */ | |
1759 | if (use_displaced_stepping (gdbarch) | |
1760 | && (tp->control.trap_expected | |
1761 | || (step && gdbarch_software_single_step_p (gdbarch))) | |
1762 | && sig == GDB_SIGNAL_0 | |
1763 | && !current_inferior ()->waiting_for_vfork_done) | |
1764 | { | |
1765 | struct displaced_step_inferior_state *displaced; | |
1766 | ||
1767 | if (!displaced_step_prepare (inferior_ptid)) | |
1768 | { | |
1769 | /* Got placed in displaced stepping queue. Will be resumed | |
1770 | later when all the currently queued displaced stepping | |
1771 | requests finish. The thread is not executing at this point, | |
1772 | and the call to set_executing will be made later. But we | |
1773 | need to call set_running here, since from frontend point of view, | |
1774 | the thread is running. */ | |
1775 | set_running (inferior_ptid, 1); | |
1776 | discard_cleanups (old_cleanups); | |
1777 | return; | |
1778 | } | |
1779 | ||
1780 | /* Update pc to reflect the new address from which we will execute | |
1781 | instructions due to displaced stepping. */ | |
1782 | pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); | |
1783 | ||
1784 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1785 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
1786 | displaced->step_closure); | |
1787 | } | |
1788 | ||
1789 | /* Do we need to do it the hard way, w/temp breakpoints? */ | |
1790 | else if (step) | |
1791 | step = maybe_software_singlestep (gdbarch, pc); | |
1792 | ||
1793 | /* Currently, our software single-step implementation leads to different | |
1794 | results than hardware single-stepping in one situation: when stepping | |
1795 | into delivering a signal which has an associated signal handler, | |
1796 | hardware single-step will stop at the first instruction of the handler, | |
1797 | while software single-step will simply skip execution of the handler. | |
1798 | ||
1799 | For now, this difference in behavior is accepted since there is no | |
1800 | easy way to actually implement single-stepping into a signal handler | |
1801 | without kernel support. | |
1802 | ||
1803 | However, there is one scenario where this difference leads to follow-on | |
1804 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
1805 | and then single-stepping. In this case, the software single-step | |
1806 | behavior means that even if there is a *breakpoint* in the signal | |
1807 | handler, GDB still would not stop. | |
1808 | ||
1809 | Fortunately, we can at least fix this particular issue. We detect | |
1810 | here the case where we are about to deliver a signal while software | |
1811 | single-stepping with breakpoints removed. In this situation, we | |
1812 | revert the decisions to remove all breakpoints and insert single- | |
1813 | step breakpoints, and instead we install a step-resume breakpoint | |
1814 | at the current address, deliver the signal without stepping, and | |
1815 | once we arrive back at the step-resume breakpoint, actually step | |
1816 | over the breakpoint we originally wanted to step over. */ | |
1817 | if (singlestep_breakpoints_inserted_p | |
1818 | && tp->control.trap_expected && sig != GDB_SIGNAL_0) | |
1819 | { | |
1820 | /* If we have nested signals or a pending signal is delivered | |
1821 | immediately after a handler returns, might might already have | |
1822 | a step-resume breakpoint set on the earlier handler. We cannot | |
1823 | set another step-resume breakpoint; just continue on until the | |
1824 | original breakpoint is hit. */ | |
1825 | if (tp->control.step_resume_breakpoint == NULL) | |
1826 | { | |
1827 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
1828 | tp->step_after_step_resume_breakpoint = 1; | |
1829 | } | |
1830 | ||
1831 | remove_single_step_breakpoints (); | |
1832 | singlestep_breakpoints_inserted_p = 0; | |
1833 | ||
1834 | insert_breakpoints (); | |
1835 | tp->control.trap_expected = 0; | |
1836 | } | |
1837 | ||
1838 | if (should_resume) | |
1839 | { | |
1840 | ptid_t resume_ptid; | |
1841 | ||
1842 | /* If STEP is set, it's a request to use hardware stepping | |
1843 | facilities. But in that case, we should never | |
1844 | use singlestep breakpoint. */ | |
1845 | gdb_assert (!(singlestep_breakpoints_inserted_p && step)); | |
1846 | ||
1847 | /* Decide the set of threads to ask the target to resume. Start | |
1848 | by assuming everything will be resumed, than narrow the set | |
1849 | by applying increasingly restricting conditions. */ | |
1850 | resume_ptid = user_visible_resume_ptid (step); | |
1851 | ||
1852 | /* Maybe resume a single thread after all. */ | |
1853 | if (singlestep_breakpoints_inserted_p | |
1854 | && stepping_past_singlestep_breakpoint) | |
1855 | { | |
1856 | /* The situation here is as follows. In thread T1 we wanted to | |
1857 | single-step. Lacking hardware single-stepping we've | |
1858 | set breakpoint at the PC of the next instruction -- call it | |
1859 | P. After resuming, we've hit that breakpoint in thread T2. | |
1860 | Now we've removed original breakpoint, inserted breakpoint | |
1861 | at P+1, and try to step to advance T2 past breakpoint. | |
1862 | We need to step only T2, as if T1 is allowed to freely run, | |
1863 | it can run past P, and if other threads are allowed to run, | |
1864 | they can hit breakpoint at P+1, and nested hits of single-step | |
1865 | breakpoints is not something we'd want -- that's complicated | |
1866 | to support, and has no value. */ | |
1867 | resume_ptid = inferior_ptid; | |
1868 | } | |
1869 | else if ((step || singlestep_breakpoints_inserted_p) | |
1870 | && tp->control.trap_expected) | |
1871 | { | |
1872 | /* We're allowing a thread to run past a breakpoint it has | |
1873 | hit, by single-stepping the thread with the breakpoint | |
1874 | removed. In which case, we need to single-step only this | |
1875 | thread, and keep others stopped, as they can miss this | |
1876 | breakpoint if allowed to run. | |
1877 | ||
1878 | The current code actually removes all breakpoints when | |
1879 | doing this, not just the one being stepped over, so if we | |
1880 | let other threads run, we can actually miss any | |
1881 | breakpoint, not just the one at PC. */ | |
1882 | resume_ptid = inferior_ptid; | |
1883 | } | |
1884 | ||
1885 | if (gdbarch_cannot_step_breakpoint (gdbarch)) | |
1886 | { | |
1887 | /* Most targets can step a breakpoint instruction, thus | |
1888 | executing it normally. But if this one cannot, just | |
1889 | continue and we will hit it anyway. */ | |
1890 | if (step && breakpoint_inserted_here_p (aspace, pc)) | |
1891 | step = 0; | |
1892 | } | |
1893 | ||
1894 | if (debug_displaced | |
1895 | && use_displaced_stepping (gdbarch) | |
1896 | && tp->control.trap_expected) | |
1897 | { | |
1898 | struct regcache *resume_regcache = get_thread_regcache (resume_ptid); | |
1899 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); | |
1900 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); | |
1901 | gdb_byte buf[4]; | |
1902 | ||
1903 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
1904 | paddress (resume_gdbarch, actual_pc)); | |
1905 | read_memory (actual_pc, buf, sizeof (buf)); | |
1906 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1907 | } | |
1908 | ||
1909 | /* Install inferior's terminal modes. */ | |
1910 | target_terminal_inferior (); | |
1911 | ||
1912 | /* Avoid confusing the next resume, if the next stop/resume | |
1913 | happens to apply to another thread. */ | |
1914 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
1915 | ||
1916 | /* Advise target which signals may be handled silently. If we have | |
1917 | removed breakpoints because we are stepping over one (which can | |
1918 | happen only if we are not using displaced stepping), we need to | |
1919 | receive all signals to avoid accidentally skipping a breakpoint | |
1920 | during execution of a signal handler. */ | |
1921 | if ((step || singlestep_breakpoints_inserted_p) | |
1922 | && tp->control.trap_expected | |
1923 | && !use_displaced_stepping (gdbarch)) | |
1924 | target_pass_signals (0, NULL); | |
1925 | else | |
1926 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
1927 | ||
1928 | target_resume (resume_ptid, step, sig); | |
1929 | } | |
1930 | ||
1931 | discard_cleanups (old_cleanups); | |
1932 | } | |
1933 | \f | |
1934 | /* Proceeding. */ | |
1935 | ||
1936 | /* Clear out all variables saying what to do when inferior is continued. | |
1937 | First do this, then set the ones you want, then call `proceed'. */ | |
1938 | ||
1939 | static void | |
1940 | clear_proceed_status_thread (struct thread_info *tp) | |
1941 | { | |
1942 | if (debug_infrun) | |
1943 | fprintf_unfiltered (gdb_stdlog, | |
1944 | "infrun: clear_proceed_status_thread (%s)\n", | |
1945 | target_pid_to_str (tp->ptid)); | |
1946 | ||
1947 | tp->control.trap_expected = 0; | |
1948 | tp->control.step_range_start = 0; | |
1949 | tp->control.step_range_end = 0; | |
1950 | tp->control.step_frame_id = null_frame_id; | |
1951 | tp->control.step_stack_frame_id = null_frame_id; | |
1952 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
1953 | tp->stop_requested = 0; | |
1954 | ||
1955 | tp->control.stop_step = 0; | |
1956 | ||
1957 | tp->control.proceed_to_finish = 0; | |
1958 | ||
1959 | /* Discard any remaining commands or status from previous stop. */ | |
1960 | bpstat_clear (&tp->control.stop_bpstat); | |
1961 | } | |
1962 | ||
1963 | static int | |
1964 | clear_proceed_status_callback (struct thread_info *tp, void *data) | |
1965 | { | |
1966 | if (is_exited (tp->ptid)) | |
1967 | return 0; | |
1968 | ||
1969 | clear_proceed_status_thread (tp); | |
1970 | return 0; | |
1971 | } | |
1972 | ||
1973 | void | |
1974 | clear_proceed_status (void) | |
1975 | { | |
1976 | if (!non_stop) | |
1977 | { | |
1978 | /* In all-stop mode, delete the per-thread status of all | |
1979 | threads, even if inferior_ptid is null_ptid, there may be | |
1980 | threads on the list. E.g., we may be launching a new | |
1981 | process, while selecting the executable. */ | |
1982 | iterate_over_threads (clear_proceed_status_callback, NULL); | |
1983 | } | |
1984 | ||
1985 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
1986 | { | |
1987 | struct inferior *inferior; | |
1988 | ||
1989 | if (non_stop) | |
1990 | { | |
1991 | /* If in non-stop mode, only delete the per-thread status of | |
1992 | the current thread. */ | |
1993 | clear_proceed_status_thread (inferior_thread ()); | |
1994 | } | |
1995 | ||
1996 | inferior = current_inferior (); | |
1997 | inferior->control.stop_soon = NO_STOP_QUIETLY; | |
1998 | } | |
1999 | ||
2000 | stop_after_trap = 0; | |
2001 | ||
2002 | observer_notify_about_to_proceed (); | |
2003 | ||
2004 | if (stop_registers) | |
2005 | { | |
2006 | regcache_xfree (stop_registers); | |
2007 | stop_registers = NULL; | |
2008 | } | |
2009 | } | |
2010 | ||
2011 | /* Check the current thread against the thread that reported the most recent | |
2012 | event. If a step-over is required return TRUE and set the current thread | |
2013 | to the old thread. Otherwise return FALSE. | |
2014 | ||
2015 | This should be suitable for any targets that support threads. */ | |
2016 | ||
2017 | static int | |
2018 | prepare_to_proceed (int step) | |
2019 | { | |
2020 | ptid_t wait_ptid; | |
2021 | struct target_waitstatus wait_status; | |
2022 | int schedlock_enabled; | |
2023 | ||
2024 | /* With non-stop mode on, threads are always handled individually. */ | |
2025 | gdb_assert (! non_stop); | |
2026 | ||
2027 | /* Get the last target status returned by target_wait(). */ | |
2028 | get_last_target_status (&wait_ptid, &wait_status); | |
2029 | ||
2030 | /* Make sure we were stopped at a breakpoint. */ | |
2031 | if (wait_status.kind != TARGET_WAITKIND_STOPPED | |
2032 | || (wait_status.value.sig != GDB_SIGNAL_TRAP | |
2033 | && wait_status.value.sig != GDB_SIGNAL_ILL | |
2034 | && wait_status.value.sig != GDB_SIGNAL_SEGV | |
2035 | && wait_status.value.sig != GDB_SIGNAL_EMT)) | |
2036 | { | |
2037 | return 0; | |
2038 | } | |
2039 | ||
2040 | schedlock_enabled = (scheduler_mode == schedlock_on | |
2041 | || (scheduler_mode == schedlock_step | |
2042 | && step)); | |
2043 | ||
2044 | /* Don't switch over to WAIT_PTID if scheduler locking is on. */ | |
2045 | if (schedlock_enabled) | |
2046 | return 0; | |
2047 | ||
2048 | /* Don't switch over if we're about to resume some other process | |
2049 | other than WAIT_PTID's, and schedule-multiple is off. */ | |
2050 | if (!sched_multi | |
2051 | && ptid_get_pid (wait_ptid) != ptid_get_pid (inferior_ptid)) | |
2052 | return 0; | |
2053 | ||
2054 | /* Switched over from WAIT_PID. */ | |
2055 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
2056 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
2057 | { | |
2058 | struct regcache *regcache = get_thread_regcache (wait_ptid); | |
2059 | ||
2060 | if (breakpoint_here_p (get_regcache_aspace (regcache), | |
2061 | regcache_read_pc (regcache))) | |
2062 | { | |
2063 | /* If stepping, remember current thread to switch back to. */ | |
2064 | if (step) | |
2065 | deferred_step_ptid = inferior_ptid; | |
2066 | ||
2067 | /* Switch back to WAIT_PID thread. */ | |
2068 | switch_to_thread (wait_ptid); | |
2069 | ||
2070 | if (debug_infrun) | |
2071 | fprintf_unfiltered (gdb_stdlog, | |
2072 | "infrun: prepare_to_proceed (step=%d), " | |
2073 | "switched to [%s]\n", | |
2074 | step, target_pid_to_str (inferior_ptid)); | |
2075 | ||
2076 | /* We return 1 to indicate that there is a breakpoint here, | |
2077 | so we need to step over it before continuing to avoid | |
2078 | hitting it straight away. */ | |
2079 | return 1; | |
2080 | } | |
2081 | } | |
2082 | ||
2083 | return 0; | |
2084 | } | |
2085 | ||
2086 | /* Basic routine for continuing the program in various fashions. | |
2087 | ||
2088 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2089 | SIGGNAL is the signal to give it, or 0 for none, | |
2090 | or -1 for act according to how it stopped. | |
2091 | STEP is nonzero if should trap after one instruction. | |
2092 | -1 means return after that and print nothing. | |
2093 | You should probably set various step_... variables | |
2094 | before calling here, if you are stepping. | |
2095 | ||
2096 | You should call clear_proceed_status before calling proceed. */ | |
2097 | ||
2098 | void | |
2099 | proceed (CORE_ADDR addr, enum gdb_signal siggnal, int step) | |
2100 | { | |
2101 | struct regcache *regcache; | |
2102 | struct gdbarch *gdbarch; | |
2103 | struct thread_info *tp; | |
2104 | CORE_ADDR pc; | |
2105 | struct address_space *aspace; | |
2106 | int oneproc = 0; | |
2107 | ||
2108 | /* If we're stopped at a fork/vfork, follow the branch set by the | |
2109 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2110 | resuming the current thread. */ | |
2111 | if (!follow_fork ()) | |
2112 | { | |
2113 | /* The target for some reason decided not to resume. */ | |
2114 | normal_stop (); | |
2115 | if (target_can_async_p ()) | |
2116 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
2117 | return; | |
2118 | } | |
2119 | ||
2120 | /* We'll update this if & when we switch to a new thread. */ | |
2121 | previous_inferior_ptid = inferior_ptid; | |
2122 | ||
2123 | regcache = get_current_regcache (); | |
2124 | gdbarch = get_regcache_arch (regcache); | |
2125 | aspace = get_regcache_aspace (regcache); | |
2126 | pc = regcache_read_pc (regcache); | |
2127 | ||
2128 | if (step > 0) | |
2129 | step_start_function = find_pc_function (pc); | |
2130 | if (step < 0) | |
2131 | stop_after_trap = 1; | |
2132 | ||
2133 | if (addr == (CORE_ADDR) -1) | |
2134 | { | |
2135 | if (pc == stop_pc && breakpoint_here_p (aspace, pc) | |
2136 | && execution_direction != EXEC_REVERSE) | |
2137 | /* There is a breakpoint at the address we will resume at, | |
2138 | step one instruction before inserting breakpoints so that | |
2139 | we do not stop right away (and report a second hit at this | |
2140 | breakpoint). | |
2141 | ||
2142 | Note, we don't do this in reverse, because we won't | |
2143 | actually be executing the breakpoint insn anyway. | |
2144 | We'll be (un-)executing the previous instruction. */ | |
2145 | ||
2146 | oneproc = 1; | |
2147 | else if (gdbarch_single_step_through_delay_p (gdbarch) | |
2148 | && gdbarch_single_step_through_delay (gdbarch, | |
2149 | get_current_frame ())) | |
2150 | /* We stepped onto an instruction that needs to be stepped | |
2151 | again before re-inserting the breakpoint, do so. */ | |
2152 | oneproc = 1; | |
2153 | } | |
2154 | else | |
2155 | { | |
2156 | regcache_write_pc (regcache, addr); | |
2157 | } | |
2158 | ||
2159 | if (debug_infrun) | |
2160 | fprintf_unfiltered (gdb_stdlog, | |
2161 | "infrun: proceed (addr=%s, signal=%d, step=%d)\n", | |
2162 | paddress (gdbarch, addr), siggnal, step); | |
2163 | ||
2164 | if (non_stop) | |
2165 | /* In non-stop, each thread is handled individually. The context | |
2166 | must already be set to the right thread here. */ | |
2167 | ; | |
2168 | else | |
2169 | { | |
2170 | /* In a multi-threaded task we may select another thread and | |
2171 | then continue or step. | |
2172 | ||
2173 | But if the old thread was stopped at a breakpoint, it will | |
2174 | immediately cause another breakpoint stop without any | |
2175 | execution (i.e. it will report a breakpoint hit incorrectly). | |
2176 | So we must step over it first. | |
2177 | ||
2178 | prepare_to_proceed checks the current thread against the | |
2179 | thread that reported the most recent event. If a step-over | |
2180 | is required it returns TRUE and sets the current thread to | |
2181 | the old thread. */ | |
2182 | if (prepare_to_proceed (step)) | |
2183 | oneproc = 1; | |
2184 | } | |
2185 | ||
2186 | /* prepare_to_proceed may change the current thread. */ | |
2187 | tp = inferior_thread (); | |
2188 | ||
2189 | if (oneproc) | |
2190 | { | |
2191 | tp->control.trap_expected = 1; | |
2192 | /* If displaced stepping is enabled, we can step over the | |
2193 | breakpoint without hitting it, so leave all breakpoints | |
2194 | inserted. Otherwise we need to disable all breakpoints, step | |
2195 | one instruction, and then re-add them when that step is | |
2196 | finished. */ | |
2197 | if (!use_displaced_stepping (gdbarch)) | |
2198 | remove_breakpoints (); | |
2199 | } | |
2200 | ||
2201 | /* We can insert breakpoints if we're not trying to step over one, | |
2202 | or if we are stepping over one but we're using displaced stepping | |
2203 | to do so. */ | |
2204 | if (! tp->control.trap_expected || use_displaced_stepping (gdbarch)) | |
2205 | insert_breakpoints (); | |
2206 | ||
2207 | if (!non_stop) | |
2208 | { | |
2209 | /* Pass the last stop signal to the thread we're resuming, | |
2210 | irrespective of whether the current thread is the thread that | |
2211 | got the last event or not. This was historically GDB's | |
2212 | behaviour before keeping a stop_signal per thread. */ | |
2213 | ||
2214 | struct thread_info *last_thread; | |
2215 | ptid_t last_ptid; | |
2216 | struct target_waitstatus last_status; | |
2217 | ||
2218 | get_last_target_status (&last_ptid, &last_status); | |
2219 | if (!ptid_equal (inferior_ptid, last_ptid) | |
2220 | && !ptid_equal (last_ptid, null_ptid) | |
2221 | && !ptid_equal (last_ptid, minus_one_ptid)) | |
2222 | { | |
2223 | last_thread = find_thread_ptid (last_ptid); | |
2224 | if (last_thread) | |
2225 | { | |
2226 | tp->suspend.stop_signal = last_thread->suspend.stop_signal; | |
2227 | last_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
2228 | } | |
2229 | } | |
2230 | } | |
2231 | ||
2232 | if (siggnal != GDB_SIGNAL_DEFAULT) | |
2233 | tp->suspend.stop_signal = siggnal; | |
2234 | /* If this signal should not be seen by program, | |
2235 | give it zero. Used for debugging signals. */ | |
2236 | else if (!signal_program[tp->suspend.stop_signal]) | |
2237 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2238 | ||
2239 | annotate_starting (); | |
2240 | ||
2241 | /* Make sure that output from GDB appears before output from the | |
2242 | inferior. */ | |
2243 | gdb_flush (gdb_stdout); | |
2244 | ||
2245 | /* Refresh prev_pc value just prior to resuming. This used to be | |
2246 | done in stop_stepping, however, setting prev_pc there did not handle | |
2247 | scenarios such as inferior function calls or returning from | |
2248 | a function via the return command. In those cases, the prev_pc | |
2249 | value was not set properly for subsequent commands. The prev_pc value | |
2250 | is used to initialize the starting line number in the ecs. With an | |
2251 | invalid value, the gdb next command ends up stopping at the position | |
2252 | represented by the next line table entry past our start position. | |
2253 | On platforms that generate one line table entry per line, this | |
2254 | is not a problem. However, on the ia64, the compiler generates | |
2255 | extraneous line table entries that do not increase the line number. | |
2256 | When we issue the gdb next command on the ia64 after an inferior call | |
2257 | or a return command, we often end up a few instructions forward, still | |
2258 | within the original line we started. | |
2259 | ||
2260 | An attempt was made to refresh the prev_pc at the same time the | |
2261 | execution_control_state is initialized (for instance, just before | |
2262 | waiting for an inferior event). But this approach did not work | |
2263 | because of platforms that use ptrace, where the pc register cannot | |
2264 | be read unless the inferior is stopped. At that point, we are not | |
2265 | guaranteed the inferior is stopped and so the regcache_read_pc() call | |
2266 | can fail. Setting the prev_pc value here ensures the value is updated | |
2267 | correctly when the inferior is stopped. */ | |
2268 | tp->prev_pc = regcache_read_pc (get_current_regcache ()); | |
2269 | ||
2270 | /* Fill in with reasonable starting values. */ | |
2271 | init_thread_stepping_state (tp); | |
2272 | ||
2273 | /* Reset to normal state. */ | |
2274 | init_infwait_state (); | |
2275 | ||
2276 | /* Resume inferior. */ | |
2277 | resume (oneproc || step || bpstat_should_step (), tp->suspend.stop_signal); | |
2278 | ||
2279 | /* Wait for it to stop (if not standalone) | |
2280 | and in any case decode why it stopped, and act accordingly. */ | |
2281 | /* Do this only if we are not using the event loop, or if the target | |
2282 | does not support asynchronous execution. */ | |
2283 | if (!target_can_async_p ()) | |
2284 | { | |
2285 | wait_for_inferior (); | |
2286 | normal_stop (); | |
2287 | } | |
2288 | } | |
2289 | \f | |
2290 | ||
2291 | /* Start remote-debugging of a machine over a serial link. */ | |
2292 | ||
2293 | void | |
2294 | start_remote (int from_tty) | |
2295 | { | |
2296 | struct inferior *inferior; | |
2297 | ||
2298 | inferior = current_inferior (); | |
2299 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; | |
2300 | ||
2301 | /* Always go on waiting for the target, regardless of the mode. */ | |
2302 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
2303 | indicate to wait_for_inferior that a target should timeout if | |
2304 | nothing is returned (instead of just blocking). Because of this, | |
2305 | targets expecting an immediate response need to, internally, set | |
2306 | things up so that the target_wait() is forced to eventually | |
2307 | timeout. */ | |
2308 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
2309 | differentiate to its caller what the state of the target is after | |
2310 | the initial open has been performed. Here we're assuming that | |
2311 | the target has stopped. It should be possible to eventually have | |
2312 | target_open() return to the caller an indication that the target | |
2313 | is currently running and GDB state should be set to the same as | |
2314 | for an async run. */ | |
2315 | wait_for_inferior (); | |
2316 | ||
2317 | /* Now that the inferior has stopped, do any bookkeeping like | |
2318 | loading shared libraries. We want to do this before normal_stop, | |
2319 | so that the displayed frame is up to date. */ | |
2320 | post_create_inferior (¤t_target, from_tty); | |
2321 | ||
2322 | normal_stop (); | |
2323 | } | |
2324 | ||
2325 | /* Initialize static vars when a new inferior begins. */ | |
2326 | ||
2327 | void | |
2328 | init_wait_for_inferior (void) | |
2329 | { | |
2330 | /* These are meaningless until the first time through wait_for_inferior. */ | |
2331 | ||
2332 | breakpoint_init_inferior (inf_starting); | |
2333 | ||
2334 | clear_proceed_status (); | |
2335 | ||
2336 | stepping_past_singlestep_breakpoint = 0; | |
2337 | deferred_step_ptid = null_ptid; | |
2338 | ||
2339 | target_last_wait_ptid = minus_one_ptid; | |
2340 | ||
2341 | previous_inferior_ptid = inferior_ptid; | |
2342 | init_infwait_state (); | |
2343 | ||
2344 | /* Discard any skipped inlined frames. */ | |
2345 | clear_inline_frame_state (minus_one_ptid); | |
2346 | } | |
2347 | ||
2348 | \f | |
2349 | /* This enum encodes possible reasons for doing a target_wait, so that | |
2350 | wfi can call target_wait in one place. (Ultimately the call will be | |
2351 | moved out of the infinite loop entirely.) */ | |
2352 | ||
2353 | enum infwait_states | |
2354 | { | |
2355 | infwait_normal_state, | |
2356 | infwait_thread_hop_state, | |
2357 | infwait_step_watch_state, | |
2358 | infwait_nonstep_watch_state | |
2359 | }; | |
2360 | ||
2361 | /* The PTID we'll do a target_wait on.*/ | |
2362 | ptid_t waiton_ptid; | |
2363 | ||
2364 | /* Current inferior wait state. */ | |
2365 | enum infwait_states infwait_state; | |
2366 | ||
2367 | /* Data to be passed around while handling an event. This data is | |
2368 | discarded between events. */ | |
2369 | struct execution_control_state | |
2370 | { | |
2371 | ptid_t ptid; | |
2372 | /* The thread that got the event, if this was a thread event; NULL | |
2373 | otherwise. */ | |
2374 | struct thread_info *event_thread; | |
2375 | ||
2376 | struct target_waitstatus ws; | |
2377 | int random_signal; | |
2378 | int stop_func_filled_in; | |
2379 | CORE_ADDR stop_func_start; | |
2380 | CORE_ADDR stop_func_end; | |
2381 | const char *stop_func_name; | |
2382 | int wait_some_more; | |
2383 | }; | |
2384 | ||
2385 | static void handle_inferior_event (struct execution_control_state *ecs); | |
2386 | ||
2387 | static void handle_step_into_function (struct gdbarch *gdbarch, | |
2388 | struct execution_control_state *ecs); | |
2389 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
2390 | struct execution_control_state *ecs); | |
2391 | static void check_exception_resume (struct execution_control_state *, | |
2392 | struct frame_info *); | |
2393 | ||
2394 | static void stop_stepping (struct execution_control_state *ecs); | |
2395 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2396 | static void keep_going (struct execution_control_state *ecs); | |
2397 | ||
2398 | /* Callback for iterate over threads. If the thread is stopped, but | |
2399 | the user/frontend doesn't know about that yet, go through | |
2400 | normal_stop, as if the thread had just stopped now. ARG points at | |
2401 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
2402 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
2403 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
2404 | PTID. */ | |
2405 | ||
2406 | static int | |
2407 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
2408 | { | |
2409 | ptid_t ptid = * (ptid_t *) arg; | |
2410 | ||
2411 | if ((ptid_equal (info->ptid, ptid) | |
2412 | || ptid_equal (minus_one_ptid, ptid) | |
2413 | || (ptid_is_pid (ptid) | |
2414 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
2415 | && is_running (info->ptid) | |
2416 | && !is_executing (info->ptid)) | |
2417 | { | |
2418 | struct cleanup *old_chain; | |
2419 | struct execution_control_state ecss; | |
2420 | struct execution_control_state *ecs = &ecss; | |
2421 | ||
2422 | memset (ecs, 0, sizeof (*ecs)); | |
2423 | ||
2424 | old_chain = make_cleanup_restore_current_thread (); | |
2425 | ||
2426 | /* Go through handle_inferior_event/normal_stop, so we always | |
2427 | have consistent output as if the stop event had been | |
2428 | reported. */ | |
2429 | ecs->ptid = info->ptid; | |
2430 | ecs->event_thread = find_thread_ptid (info->ptid); | |
2431 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
2432 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
2433 | ||
2434 | handle_inferior_event (ecs); | |
2435 | ||
2436 | if (!ecs->wait_some_more) | |
2437 | { | |
2438 | struct thread_info *tp; | |
2439 | ||
2440 | normal_stop (); | |
2441 | ||
2442 | /* Finish off the continuations. */ | |
2443 | tp = inferior_thread (); | |
2444 | do_all_intermediate_continuations_thread (tp, 1); | |
2445 | do_all_continuations_thread (tp, 1); | |
2446 | } | |
2447 | ||
2448 | do_cleanups (old_chain); | |
2449 | } | |
2450 | ||
2451 | return 0; | |
2452 | } | |
2453 | ||
2454 | /* This function is attached as a "thread_stop_requested" observer. | |
2455 | Cleanup local state that assumed the PTID was to be resumed, and | |
2456 | report the stop to the frontend. */ | |
2457 | ||
2458 | static void | |
2459 | infrun_thread_stop_requested (ptid_t ptid) | |
2460 | { | |
2461 | struct displaced_step_inferior_state *displaced; | |
2462 | ||
2463 | /* PTID was requested to stop. Remove it from the displaced | |
2464 | stepping queue, so we don't try to resume it automatically. */ | |
2465 | ||
2466 | for (displaced = displaced_step_inferior_states; | |
2467 | displaced; | |
2468 | displaced = displaced->next) | |
2469 | { | |
2470 | struct displaced_step_request *it, **prev_next_p; | |
2471 | ||
2472 | it = displaced->step_request_queue; | |
2473 | prev_next_p = &displaced->step_request_queue; | |
2474 | while (it) | |
2475 | { | |
2476 | if (ptid_match (it->ptid, ptid)) | |
2477 | { | |
2478 | *prev_next_p = it->next; | |
2479 | it->next = NULL; | |
2480 | xfree (it); | |
2481 | } | |
2482 | else | |
2483 | { | |
2484 | prev_next_p = &it->next; | |
2485 | } | |
2486 | ||
2487 | it = *prev_next_p; | |
2488 | } | |
2489 | } | |
2490 | ||
2491 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
2492 | } | |
2493 | ||
2494 | static void | |
2495 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
2496 | { | |
2497 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
2498 | nullify_last_target_wait_ptid (); | |
2499 | } | |
2500 | ||
2501 | /* Callback for iterate_over_threads. */ | |
2502 | ||
2503 | static int | |
2504 | delete_step_resume_breakpoint_callback (struct thread_info *info, void *data) | |
2505 | { | |
2506 | if (is_exited (info->ptid)) | |
2507 | return 0; | |
2508 | ||
2509 | delete_step_resume_breakpoint (info); | |
2510 | delete_exception_resume_breakpoint (info); | |
2511 | return 0; | |
2512 | } | |
2513 | ||
2514 | /* In all-stop, delete the step resume breakpoint of any thread that | |
2515 | had one. In non-stop, delete the step resume breakpoint of the | |
2516 | thread that just stopped. */ | |
2517 | ||
2518 | static void | |
2519 | delete_step_thread_step_resume_breakpoint (void) | |
2520 | { | |
2521 | if (!target_has_execution | |
2522 | || ptid_equal (inferior_ptid, null_ptid)) | |
2523 | /* If the inferior has exited, we have already deleted the step | |
2524 | resume breakpoints out of GDB's lists. */ | |
2525 | return; | |
2526 | ||
2527 | if (non_stop) | |
2528 | { | |
2529 | /* If in non-stop mode, only delete the step-resume or | |
2530 | longjmp-resume breakpoint of the thread that just stopped | |
2531 | stepping. */ | |
2532 | struct thread_info *tp = inferior_thread (); | |
2533 | ||
2534 | delete_step_resume_breakpoint (tp); | |
2535 | delete_exception_resume_breakpoint (tp); | |
2536 | } | |
2537 | else | |
2538 | /* In all-stop mode, delete all step-resume and longjmp-resume | |
2539 | breakpoints of any thread that had them. */ | |
2540 | iterate_over_threads (delete_step_resume_breakpoint_callback, NULL); | |
2541 | } | |
2542 | ||
2543 | /* A cleanup wrapper. */ | |
2544 | ||
2545 | static void | |
2546 | delete_step_thread_step_resume_breakpoint_cleanup (void *arg) | |
2547 | { | |
2548 | delete_step_thread_step_resume_breakpoint (); | |
2549 | } | |
2550 | ||
2551 | /* Pretty print the results of target_wait, for debugging purposes. */ | |
2552 | ||
2553 | static void | |
2554 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, | |
2555 | const struct target_waitstatus *ws) | |
2556 | { | |
2557 | char *status_string = target_waitstatus_to_string (ws); | |
2558 | struct ui_file *tmp_stream = mem_fileopen (); | |
2559 | char *text; | |
2560 | ||
2561 | /* The text is split over several lines because it was getting too long. | |
2562 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
2563 | output as a unit; we want only one timestamp printed if debug_timestamp | |
2564 | is set. */ | |
2565 | ||
2566 | fprintf_unfiltered (tmp_stream, | |
2567 | "infrun: target_wait (%d", PIDGET (waiton_ptid)); | |
2568 | if (PIDGET (waiton_ptid) != -1) | |
2569 | fprintf_unfiltered (tmp_stream, | |
2570 | " [%s]", target_pid_to_str (waiton_ptid)); | |
2571 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
2572 | fprintf_unfiltered (tmp_stream, | |
2573 | "infrun: %d [%s],\n", | |
2574 | PIDGET (result_ptid), target_pid_to_str (result_ptid)); | |
2575 | fprintf_unfiltered (tmp_stream, | |
2576 | "infrun: %s\n", | |
2577 | status_string); | |
2578 | ||
2579 | text = ui_file_xstrdup (tmp_stream, NULL); | |
2580 | ||
2581 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
2582 | a gcc error: the format attribute requires a string literal. */ | |
2583 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
2584 | ||
2585 | xfree (status_string); | |
2586 | xfree (text); | |
2587 | ui_file_delete (tmp_stream); | |
2588 | } | |
2589 | ||
2590 | /* Prepare and stabilize the inferior for detaching it. E.g., | |
2591 | detaching while a thread is displaced stepping is a recipe for | |
2592 | crashing it, as nothing would readjust the PC out of the scratch | |
2593 | pad. */ | |
2594 | ||
2595 | void | |
2596 | prepare_for_detach (void) | |
2597 | { | |
2598 | struct inferior *inf = current_inferior (); | |
2599 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
2600 | struct cleanup *old_chain_1; | |
2601 | struct displaced_step_inferior_state *displaced; | |
2602 | ||
2603 | displaced = get_displaced_stepping_state (inf->pid); | |
2604 | ||
2605 | /* Is any thread of this process displaced stepping? If not, | |
2606 | there's nothing else to do. */ | |
2607 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
2608 | return; | |
2609 | ||
2610 | if (debug_infrun) | |
2611 | fprintf_unfiltered (gdb_stdlog, | |
2612 | "displaced-stepping in-process while detaching"); | |
2613 | ||
2614 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
2615 | inf->detaching = 1; | |
2616 | ||
2617 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
2618 | { | |
2619 | struct cleanup *old_chain_2; | |
2620 | struct execution_control_state ecss; | |
2621 | struct execution_control_state *ecs; | |
2622 | ||
2623 | ecs = &ecss; | |
2624 | memset (ecs, 0, sizeof (*ecs)); | |
2625 | ||
2626 | overlay_cache_invalid = 1; | |
2627 | ||
2628 | if (deprecated_target_wait_hook) | |
2629 | ecs->ptid = deprecated_target_wait_hook (pid_ptid, &ecs->ws, 0); | |
2630 | else | |
2631 | ecs->ptid = target_wait (pid_ptid, &ecs->ws, 0); | |
2632 | ||
2633 | if (debug_infrun) | |
2634 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
2635 | ||
2636 | /* If an error happens while handling the event, propagate GDB's | |
2637 | knowledge of the executing state to the frontend/user running | |
2638 | state. */ | |
2639 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, | |
2640 | &minus_one_ptid); | |
2641 | ||
2642 | /* Now figure out what to do with the result of the result. */ | |
2643 | handle_inferior_event (ecs); | |
2644 | ||
2645 | /* No error, don't finish the state yet. */ | |
2646 | discard_cleanups (old_chain_2); | |
2647 | ||
2648 | /* Breakpoints and watchpoints are not installed on the target | |
2649 | at this point, and signals are passed directly to the | |
2650 | inferior, so this must mean the process is gone. */ | |
2651 | if (!ecs->wait_some_more) | |
2652 | { | |
2653 | discard_cleanups (old_chain_1); | |
2654 | error (_("Program exited while detaching")); | |
2655 | } | |
2656 | } | |
2657 | ||
2658 | discard_cleanups (old_chain_1); | |
2659 | } | |
2660 | ||
2661 | /* Wait for control to return from inferior to debugger. | |
2662 | ||
2663 | If inferior gets a signal, we may decide to start it up again | |
2664 | instead of returning. That is why there is a loop in this function. | |
2665 | When this function actually returns it means the inferior | |
2666 | should be left stopped and GDB should read more commands. */ | |
2667 | ||
2668 | void | |
2669 | wait_for_inferior (void) | |
2670 | { | |
2671 | struct cleanup *old_cleanups; | |
2672 | ||
2673 | if (debug_infrun) | |
2674 | fprintf_unfiltered | |
2675 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); | |
2676 | ||
2677 | old_cleanups = | |
2678 | make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup, NULL); | |
2679 | ||
2680 | while (1) | |
2681 | { | |
2682 | struct execution_control_state ecss; | |
2683 | struct execution_control_state *ecs = &ecss; | |
2684 | struct cleanup *old_chain; | |
2685 | ||
2686 | memset (ecs, 0, sizeof (*ecs)); | |
2687 | ||
2688 | overlay_cache_invalid = 1; | |
2689 | ||
2690 | if (deprecated_target_wait_hook) | |
2691 | ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws, 0); | |
2692 | else | |
2693 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, 0); | |
2694 | ||
2695 | if (debug_infrun) | |
2696 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); | |
2697 | ||
2698 | /* If an error happens while handling the event, propagate GDB's | |
2699 | knowledge of the executing state to the frontend/user running | |
2700 | state. */ | |
2701 | old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2702 | ||
2703 | /* Now figure out what to do with the result of the result. */ | |
2704 | handle_inferior_event (ecs); | |
2705 | ||
2706 | /* No error, don't finish the state yet. */ | |
2707 | discard_cleanups (old_chain); | |
2708 | ||
2709 | if (!ecs->wait_some_more) | |
2710 | break; | |
2711 | } | |
2712 | ||
2713 | do_cleanups (old_cleanups); | |
2714 | } | |
2715 | ||
2716 | /* Asynchronous version of wait_for_inferior. It is called by the | |
2717 | event loop whenever a change of state is detected on the file | |
2718 | descriptor corresponding to the target. It can be called more than | |
2719 | once to complete a single execution command. In such cases we need | |
2720 | to keep the state in a global variable ECSS. If it is the last time | |
2721 | that this function is called for a single execution command, then | |
2722 | report to the user that the inferior has stopped, and do the | |
2723 | necessary cleanups. */ | |
2724 | ||
2725 | void | |
2726 | fetch_inferior_event (void *client_data) | |
2727 | { | |
2728 | struct execution_control_state ecss; | |
2729 | struct execution_control_state *ecs = &ecss; | |
2730 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); | |
2731 | struct cleanup *ts_old_chain; | |
2732 | int was_sync = sync_execution; | |
2733 | int cmd_done = 0; | |
2734 | ||
2735 | memset (ecs, 0, sizeof (*ecs)); | |
2736 | ||
2737 | /* We're handling a live event, so make sure we're doing live | |
2738 | debugging. If we're looking at traceframes while the target is | |
2739 | running, we're going to need to get back to that mode after | |
2740 | handling the event. */ | |
2741 | if (non_stop) | |
2742 | { | |
2743 | make_cleanup_restore_current_traceframe (); | |
2744 | set_current_traceframe (-1); | |
2745 | } | |
2746 | ||
2747 | if (non_stop) | |
2748 | /* In non-stop mode, the user/frontend should not notice a thread | |
2749 | switch due to internal events. Make sure we reverse to the | |
2750 | user selected thread and frame after handling the event and | |
2751 | running any breakpoint commands. */ | |
2752 | make_cleanup_restore_current_thread (); | |
2753 | ||
2754 | overlay_cache_invalid = 1; | |
2755 | ||
2756 | make_cleanup_restore_integer (&execution_direction); | |
2757 | execution_direction = target_execution_direction (); | |
2758 | ||
2759 | if (deprecated_target_wait_hook) | |
2760 | ecs->ptid = | |
2761 | deprecated_target_wait_hook (waiton_ptid, &ecs->ws, TARGET_WNOHANG); | |
2762 | else | |
2763 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, TARGET_WNOHANG); | |
2764 | ||
2765 | if (debug_infrun) | |
2766 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); | |
2767 | ||
2768 | /* If an error happens while handling the event, propagate GDB's | |
2769 | knowledge of the executing state to the frontend/user running | |
2770 | state. */ | |
2771 | if (!non_stop) | |
2772 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2773 | else | |
2774 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
2775 | ||
2776 | /* Get executed before make_cleanup_restore_current_thread above to apply | |
2777 | still for the thread which has thrown the exception. */ | |
2778 | make_bpstat_clear_actions_cleanup (); | |
2779 | ||
2780 | /* Now figure out what to do with the result of the result. */ | |
2781 | handle_inferior_event (ecs); | |
2782 | ||
2783 | if (!ecs->wait_some_more) | |
2784 | { | |
2785 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
2786 | ||
2787 | delete_step_thread_step_resume_breakpoint (); | |
2788 | ||
2789 | /* We may not find an inferior if this was a process exit. */ | |
2790 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
2791 | normal_stop (); | |
2792 | ||
2793 | if (target_has_execution | |
2794 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED | |
2795 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2796 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
2797 | && ecs->event_thread->step_multi | |
2798 | && ecs->event_thread->control.stop_step) | |
2799 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
2800 | else | |
2801 | { | |
2802 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
2803 | cmd_done = 1; | |
2804 | } | |
2805 | } | |
2806 | ||
2807 | /* No error, don't finish the thread states yet. */ | |
2808 | discard_cleanups (ts_old_chain); | |
2809 | ||
2810 | /* Revert thread and frame. */ | |
2811 | do_cleanups (old_chain); | |
2812 | ||
2813 | /* If the inferior was in sync execution mode, and now isn't, | |
2814 | restore the prompt (a synchronous execution command has finished, | |
2815 | and we're ready for input). */ | |
2816 | if (interpreter_async && was_sync && !sync_execution) | |
2817 | display_gdb_prompt (0); | |
2818 | ||
2819 | if (cmd_done | |
2820 | && !was_sync | |
2821 | && exec_done_display_p | |
2822 | && (ptid_equal (inferior_ptid, null_ptid) | |
2823 | || !is_running (inferior_ptid))) | |
2824 | printf_unfiltered (_("completed.\n")); | |
2825 | } | |
2826 | ||
2827 | /* Record the frame and location we're currently stepping through. */ | |
2828 | void | |
2829 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
2830 | { | |
2831 | struct thread_info *tp = inferior_thread (); | |
2832 | ||
2833 | tp->control.step_frame_id = get_frame_id (frame); | |
2834 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
2835 | ||
2836 | tp->current_symtab = sal.symtab; | |
2837 | tp->current_line = sal.line; | |
2838 | } | |
2839 | ||
2840 | /* Clear context switchable stepping state. */ | |
2841 | ||
2842 | void | |
2843 | init_thread_stepping_state (struct thread_info *tss) | |
2844 | { | |
2845 | tss->stepping_over_breakpoint = 0; | |
2846 | tss->step_after_step_resume_breakpoint = 0; | |
2847 | } | |
2848 | ||
2849 | /* Return the cached copy of the last pid/waitstatus returned by | |
2850 | target_wait()/deprecated_target_wait_hook(). The data is actually | |
2851 | cached by handle_inferior_event(), which gets called immediately | |
2852 | after target_wait()/deprecated_target_wait_hook(). */ | |
2853 | ||
2854 | void | |
2855 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) | |
2856 | { | |
2857 | *ptidp = target_last_wait_ptid; | |
2858 | *status = target_last_waitstatus; | |
2859 | } | |
2860 | ||
2861 | void | |
2862 | nullify_last_target_wait_ptid (void) | |
2863 | { | |
2864 | target_last_wait_ptid = minus_one_ptid; | |
2865 | } | |
2866 | ||
2867 | /* Switch thread contexts. */ | |
2868 | ||
2869 | static void | |
2870 | context_switch (ptid_t ptid) | |
2871 | { | |
2872 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) | |
2873 | { | |
2874 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
2875 | target_pid_to_str (inferior_ptid)); | |
2876 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
2877 | target_pid_to_str (ptid)); | |
2878 | } | |
2879 | ||
2880 | switch_to_thread (ptid); | |
2881 | } | |
2882 | ||
2883 | static void | |
2884 | adjust_pc_after_break (struct execution_control_state *ecs) | |
2885 | { | |
2886 | struct regcache *regcache; | |
2887 | struct gdbarch *gdbarch; | |
2888 | struct address_space *aspace; | |
2889 | CORE_ADDR breakpoint_pc; | |
2890 | ||
2891 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
2892 | we aren't, just return. | |
2893 | ||
2894 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
2895 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are | |
2896 | implemented by software breakpoints should be handled through the normal | |
2897 | breakpoint layer. | |
2898 | ||
2899 | NOTE drow/2004-01-31: On some targets, breakpoints may generate | |
2900 | different signals (SIGILL or SIGEMT for instance), but it is less | |
2901 | clear where the PC is pointing afterwards. It may not match | |
2902 | gdbarch_decr_pc_after_break. I don't know any specific target that | |
2903 | generates these signals at breakpoints (the code has been in GDB since at | |
2904 | least 1992) so I can not guess how to handle them here. | |
2905 | ||
2906 | In earlier versions of GDB, a target with | |
2907 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
2908 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any | |
2909 | target with both of these set in GDB history, and it seems unlikely to be | |
2910 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
2911 | ||
2912 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
2913 | return; | |
2914 | ||
2915 | if (ecs->ws.value.sig != GDB_SIGNAL_TRAP) | |
2916 | return; | |
2917 | ||
2918 | /* In reverse execution, when a breakpoint is hit, the instruction | |
2919 | under it has already been de-executed. The reported PC always | |
2920 | points at the breakpoint address, so adjusting it further would | |
2921 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
2922 | architecture: | |
2923 | ||
2924 | B1 0x08000000 : INSN1 | |
2925 | B2 0x08000001 : INSN2 | |
2926 | 0x08000002 : INSN3 | |
2927 | PC -> 0x08000003 : INSN4 | |
2928 | ||
2929 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
2930 | from that point should hit B2 as below. Reading the PC when the | |
2931 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
2932 | been de-executed already. | |
2933 | ||
2934 | B1 0x08000000 : INSN1 | |
2935 | B2 PC -> 0x08000001 : INSN2 | |
2936 | 0x08000002 : INSN3 | |
2937 | 0x08000003 : INSN4 | |
2938 | ||
2939 | We can't apply the same logic as for forward execution, because | |
2940 | we would wrongly adjust the PC to 0x08000000, since there's a | |
2941 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
2942 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
2943 | behaviour. */ | |
2944 | if (execution_direction == EXEC_REVERSE) | |
2945 | return; | |
2946 | ||
2947 | /* If this target does not decrement the PC after breakpoints, then | |
2948 | we have nothing to do. */ | |
2949 | regcache = get_thread_regcache (ecs->ptid); | |
2950 | gdbarch = get_regcache_arch (regcache); | |
2951 | if (gdbarch_decr_pc_after_break (gdbarch) == 0) | |
2952 | return; | |
2953 | ||
2954 | aspace = get_regcache_aspace (regcache); | |
2955 | ||
2956 | /* Find the location where (if we've hit a breakpoint) the | |
2957 | breakpoint would be. */ | |
2958 | breakpoint_pc = regcache_read_pc (regcache) | |
2959 | - gdbarch_decr_pc_after_break (gdbarch); | |
2960 | ||
2961 | /* Check whether there actually is a software breakpoint inserted at | |
2962 | that location. | |
2963 | ||
2964 | If in non-stop mode, a race condition is possible where we've | |
2965 | removed a breakpoint, but stop events for that breakpoint were | |
2966 | already queued and arrive later. To suppress those spurious | |
2967 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
2968 | and retire them after a number of stop events are reported. */ | |
2969 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) | |
2970 | || (non_stop && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
2971 | { | |
2972 | struct cleanup *old_cleanups = NULL; | |
2973 | ||
2974 | if (RECORD_IS_USED) | |
2975 | old_cleanups = record_gdb_operation_disable_set (); | |
2976 | ||
2977 | /* When using hardware single-step, a SIGTRAP is reported for both | |
2978 | a completed single-step and a software breakpoint. Need to | |
2979 | differentiate between the two, as the latter needs adjusting | |
2980 | but the former does not. | |
2981 | ||
2982 | The SIGTRAP can be due to a completed hardware single-step only if | |
2983 | - we didn't insert software single-step breakpoints | |
2984 | - the thread to be examined is still the current thread | |
2985 | - this thread is currently being stepped | |
2986 | ||
2987 | If any of these events did not occur, we must have stopped due | |
2988 | to hitting a software breakpoint, and have to back up to the | |
2989 | breakpoint address. | |
2990 | ||
2991 | As a special case, we could have hardware single-stepped a | |
2992 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
2993 | we also need to back up to the breakpoint address. */ | |
2994 | ||
2995 | if (singlestep_breakpoints_inserted_p | |
2996 | || !ptid_equal (ecs->ptid, inferior_ptid) | |
2997 | || !currently_stepping (ecs->event_thread) | |
2998 | || ecs->event_thread->prev_pc == breakpoint_pc) | |
2999 | regcache_write_pc (regcache, breakpoint_pc); | |
3000 | ||
3001 | if (RECORD_IS_USED) | |
3002 | do_cleanups (old_cleanups); | |
3003 | } | |
3004 | } | |
3005 | ||
3006 | void | |
3007 | init_infwait_state (void) | |
3008 | { | |
3009 | waiton_ptid = pid_to_ptid (-1); | |
3010 | infwait_state = infwait_normal_state; | |
3011 | } | |
3012 | ||
3013 | void | |
3014 | error_is_running (void) | |
3015 | { | |
3016 | error (_("Cannot execute this command while " | |
3017 | "the selected thread is running.")); | |
3018 | } | |
3019 | ||
3020 | void | |
3021 | ensure_not_running (void) | |
3022 | { | |
3023 | if (is_running (inferior_ptid)) | |
3024 | error_is_running (); | |
3025 | } | |
3026 | ||
3027 | static int | |
3028 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
3029 | { | |
3030 | for (frame = get_prev_frame (frame); | |
3031 | frame != NULL; | |
3032 | frame = get_prev_frame (frame)) | |
3033 | { | |
3034 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
3035 | return 1; | |
3036 | if (get_frame_type (frame) != INLINE_FRAME) | |
3037 | break; | |
3038 | } | |
3039 | ||
3040 | return 0; | |
3041 | } | |
3042 | ||
3043 | /* Auxiliary function that handles syscall entry/return events. | |
3044 | It returns 1 if the inferior should keep going (and GDB | |
3045 | should ignore the event), or 0 if the event deserves to be | |
3046 | processed. */ | |
3047 | ||
3048 | static int | |
3049 | handle_syscall_event (struct execution_control_state *ecs) | |
3050 | { | |
3051 | struct regcache *regcache; | |
3052 | struct gdbarch *gdbarch; | |
3053 | int syscall_number; | |
3054 | ||
3055 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3056 | context_switch (ecs->ptid); | |
3057 | ||
3058 | regcache = get_thread_regcache (ecs->ptid); | |
3059 | gdbarch = get_regcache_arch (regcache); | |
3060 | syscall_number = ecs->ws.value.syscall_number; | |
3061 | stop_pc = regcache_read_pc (regcache); | |
3062 | ||
3063 | if (catch_syscall_enabled () > 0 | |
3064 | && catching_syscall_number (syscall_number) > 0) | |
3065 | { | |
3066 | if (debug_infrun) | |
3067 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
3068 | syscall_number); | |
3069 | ||
3070 | ecs->event_thread->control.stop_bpstat | |
3071 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
3072 | stop_pc, ecs->ptid, &ecs->ws); | |
3073 | ecs->random_signal | |
3074 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat); | |
3075 | ||
3076 | if (!ecs->random_signal) | |
3077 | { | |
3078 | /* Catchpoint hit. */ | |
3079 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_TRAP; | |
3080 | return 0; | |
3081 | } | |
3082 | } | |
3083 | ||
3084 | /* If no catchpoint triggered for this, then keep going. */ | |
3085 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
3086 | keep_going (ecs); | |
3087 | return 1; | |
3088 | } | |
3089 | ||
3090 | /* Clear the supplied execution_control_state's stop_func_* fields. */ | |
3091 | ||
3092 | static void | |
3093 | clear_stop_func (struct execution_control_state *ecs) | |
3094 | { | |
3095 | ecs->stop_func_filled_in = 0; | |
3096 | ecs->stop_func_start = 0; | |
3097 | ecs->stop_func_end = 0; | |
3098 | ecs->stop_func_name = NULL; | |
3099 | } | |
3100 | ||
3101 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ | |
3102 | ||
3103 | static void | |
3104 | fill_in_stop_func (struct gdbarch *gdbarch, | |
3105 | struct execution_control_state *ecs) | |
3106 | { | |
3107 | if (!ecs->stop_func_filled_in) | |
3108 | { | |
3109 | /* Don't care about return value; stop_func_start and stop_func_name | |
3110 | will both be 0 if it doesn't work. */ | |
3111 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
3112 | &ecs->stop_func_start, &ecs->stop_func_end); | |
3113 | ecs->stop_func_start | |
3114 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
3115 | ||
3116 | ecs->stop_func_filled_in = 1; | |
3117 | } | |
3118 | } | |
3119 | ||
3120 | /* Given an execution control state that has been freshly filled in | |
3121 | by an event from the inferior, figure out what it means and take | |
3122 | appropriate action. */ | |
3123 | ||
3124 | static void | |
3125 | handle_inferior_event (struct execution_control_state *ecs) | |
3126 | { | |
3127 | struct frame_info *frame; | |
3128 | struct gdbarch *gdbarch; | |
3129 | int stopped_by_watchpoint; | |
3130 | int stepped_after_stopped_by_watchpoint = 0; | |
3131 | struct symtab_and_line stop_pc_sal; | |
3132 | enum stop_kind stop_soon; | |
3133 | ||
3134 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) | |
3135 | { | |
3136 | /* We had an event in the inferior, but we are not interested in | |
3137 | handling it at this level. The lower layers have already | |
3138 | done what needs to be done, if anything. | |
3139 | ||
3140 | One of the possible circumstances for this is when the | |
3141 | inferior produces output for the console. The inferior has | |
3142 | not stopped, and we are ignoring the event. Another possible | |
3143 | circumstance is any event which the lower level knows will be | |
3144 | reported multiple times without an intervening resume. */ | |
3145 | if (debug_infrun) | |
3146 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
3147 | prepare_to_wait (ecs); | |
3148 | return; | |
3149 | } | |
3150 | ||
3151 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED | |
3152 | && target_can_async_p () && !sync_execution) | |
3153 | { | |
3154 | /* There were no unwaited-for children left in the target, but, | |
3155 | we're not synchronously waiting for events either. Just | |
3156 | ignore. Otherwise, if we were running a synchronous | |
3157 | execution command, we need to cancel it and give the user | |
3158 | back the terminal. */ | |
3159 | if (debug_infrun) | |
3160 | fprintf_unfiltered (gdb_stdlog, | |
3161 | "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n"); | |
3162 | prepare_to_wait (ecs); | |
3163 | return; | |
3164 | } | |
3165 | ||
3166 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
3167 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
3168 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
3169 | { | |
3170 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
3171 | ||
3172 | gdb_assert (inf); | |
3173 | stop_soon = inf->control.stop_soon; | |
3174 | } | |
3175 | else | |
3176 | stop_soon = NO_STOP_QUIETLY; | |
3177 | ||
3178 | /* Cache the last pid/waitstatus. */ | |
3179 | target_last_wait_ptid = ecs->ptid; | |
3180 | target_last_waitstatus = ecs->ws; | |
3181 | ||
3182 | /* Always clear state belonging to the previous time we stopped. */ | |
3183 | stop_stack_dummy = STOP_NONE; | |
3184 | ||
3185 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
3186 | { | |
3187 | /* No unwaited-for children left. IOW, all resumed children | |
3188 | have exited. */ | |
3189 | if (debug_infrun) | |
3190 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
3191 | ||
3192 | stop_print_frame = 0; | |
3193 | stop_stepping (ecs); | |
3194 | return; | |
3195 | } | |
3196 | ||
3197 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
3198 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) | |
3199 | { | |
3200 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
3201 | /* If it's a new thread, add it to the thread database. */ | |
3202 | if (ecs->event_thread == NULL) | |
3203 | ecs->event_thread = add_thread (ecs->ptid); | |
3204 | } | |
3205 | ||
3206 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
3207 | adjust_pc_after_break (ecs); | |
3208 | ||
3209 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
3210 | reinit_frame_cache (); | |
3211 | ||
3212 | breakpoint_retire_moribund (); | |
3213 | ||
3214 | /* First, distinguish signals caused by the debugger from signals | |
3215 | that have to do with the program's own actions. Note that | |
3216 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
3217 | on the operating system version. Here we detect when a SIGILL or | |
3218 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
3219 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
3220 | when we're trying to execute a breakpoint instruction on a | |
3221 | non-executable stack. This happens for call dummy breakpoints | |
3222 | for architectures like SPARC that place call dummies on the | |
3223 | stack. */ | |
3224 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED | |
3225 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL | |
3226 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
3227 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
3228 | { | |
3229 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
3230 | ||
3231 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
3232 | regcache_read_pc (regcache))) | |
3233 | { | |
3234 | if (debug_infrun) | |
3235 | fprintf_unfiltered (gdb_stdlog, | |
3236 | "infrun: Treating signal as SIGTRAP\n"); | |
3237 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; | |
3238 | } | |
3239 | } | |
3240 | ||
3241 | /* Mark the non-executing threads accordingly. In all-stop, all | |
3242 | threads of all processes are stopped when we get any event | |
3243 | reported. In non-stop mode, only the event thread stops. If | |
3244 | we're handling a process exit in non-stop mode, there's nothing | |
3245 | to do, as threads of the dead process are gone, and threads of | |
3246 | any other process were left running. */ | |
3247 | if (!non_stop) | |
3248 | set_executing (minus_one_ptid, 0); | |
3249 | else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
3250 | && ecs->ws.kind != TARGET_WAITKIND_EXITED) | |
3251 | set_executing (ecs->ptid, 0); | |
3252 | ||
3253 | switch (infwait_state) | |
3254 | { | |
3255 | case infwait_thread_hop_state: | |
3256 | if (debug_infrun) | |
3257 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); | |
3258 | break; | |
3259 | ||
3260 | case infwait_normal_state: | |
3261 | if (debug_infrun) | |
3262 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); | |
3263 | break; | |
3264 | ||
3265 | case infwait_step_watch_state: | |
3266 | if (debug_infrun) | |
3267 | fprintf_unfiltered (gdb_stdlog, | |
3268 | "infrun: infwait_step_watch_state\n"); | |
3269 | ||
3270 | stepped_after_stopped_by_watchpoint = 1; | |
3271 | break; | |
3272 | ||
3273 | case infwait_nonstep_watch_state: | |
3274 | if (debug_infrun) | |
3275 | fprintf_unfiltered (gdb_stdlog, | |
3276 | "infrun: infwait_nonstep_watch_state\n"); | |
3277 | insert_breakpoints (); | |
3278 | ||
3279 | /* FIXME-maybe: is this cleaner than setting a flag? Does it | |
3280 | handle things like signals arriving and other things happening | |
3281 | in combination correctly? */ | |
3282 | stepped_after_stopped_by_watchpoint = 1; | |
3283 | break; | |
3284 | ||
3285 | default: | |
3286 | internal_error (__FILE__, __LINE__, _("bad switch")); | |
3287 | } | |
3288 | ||
3289 | infwait_state = infwait_normal_state; | |
3290 | waiton_ptid = pid_to_ptid (-1); | |
3291 | ||
3292 | switch (ecs->ws.kind) | |
3293 | { | |
3294 | case TARGET_WAITKIND_LOADED: | |
3295 | if (debug_infrun) | |
3296 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); | |
3297 | /* Ignore gracefully during startup of the inferior, as it might | |
3298 | be the shell which has just loaded some objects, otherwise | |
3299 | add the symbols for the newly loaded objects. Also ignore at | |
3300 | the beginning of an attach or remote session; we will query | |
3301 | the full list of libraries once the connection is | |
3302 | established. */ | |
3303 | if (stop_soon == NO_STOP_QUIETLY) | |
3304 | { | |
3305 | struct regcache *regcache; | |
3306 | ||
3307 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3308 | context_switch (ecs->ptid); | |
3309 | regcache = get_thread_regcache (ecs->ptid); | |
3310 | ||
3311 | handle_solib_event (); | |
3312 | ||
3313 | ecs->event_thread->control.stop_bpstat | |
3314 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
3315 | stop_pc, ecs->ptid, &ecs->ws); | |
3316 | ecs->random_signal | |
3317 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat); | |
3318 | ||
3319 | if (!ecs->random_signal) | |
3320 | { | |
3321 | /* A catchpoint triggered. */ | |
3322 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_TRAP; | |
3323 | goto process_event_stop_test; | |
3324 | } | |
3325 | ||
3326 | /* If requested, stop when the dynamic linker notifies | |
3327 | gdb of events. This allows the user to get control | |
3328 | and place breakpoints in initializer routines for | |
3329 | dynamically loaded objects (among other things). */ | |
3330 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
3331 | if (stop_on_solib_events) | |
3332 | { | |
3333 | /* Make sure we print "Stopped due to solib-event" in | |
3334 | normal_stop. */ | |
3335 | stop_print_frame = 1; | |
3336 | ||
3337 | stop_stepping (ecs); | |
3338 | return; | |
3339 | } | |
3340 | } | |
3341 | ||
3342 | /* If we are skipping through a shell, or through shared library | |
3343 | loading that we aren't interested in, resume the program. If | |
3344 | we're running the program normally, also resume. But stop if | |
3345 | we're attaching or setting up a remote connection. */ | |
3346 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
3347 | { | |
3348 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3349 | context_switch (ecs->ptid); | |
3350 | ||
3351 | /* Loading of shared libraries might have changed breakpoint | |
3352 | addresses. Make sure new breakpoints are inserted. */ | |
3353 | if (stop_soon == NO_STOP_QUIETLY | |
3354 | && !breakpoints_always_inserted_mode ()) | |
3355 | insert_breakpoints (); | |
3356 | resume (0, GDB_SIGNAL_0); | |
3357 | prepare_to_wait (ecs); | |
3358 | return; | |
3359 | } | |
3360 | ||
3361 | break; | |
3362 | ||
3363 | case TARGET_WAITKIND_SPURIOUS: | |
3364 | if (debug_infrun) | |
3365 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); | |
3366 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3367 | context_switch (ecs->ptid); | |
3368 | resume (0, GDB_SIGNAL_0); | |
3369 | prepare_to_wait (ecs); | |
3370 | return; | |
3371 | ||
3372 | case TARGET_WAITKIND_EXITED: | |
3373 | case TARGET_WAITKIND_SIGNALLED: | |
3374 | if (debug_infrun) | |
3375 | { | |
3376 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
3377 | fprintf_unfiltered (gdb_stdlog, | |
3378 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
3379 | else | |
3380 | fprintf_unfiltered (gdb_stdlog, | |
3381 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
3382 | } | |
3383 | ||
3384 | inferior_ptid = ecs->ptid; | |
3385 | set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid))); | |
3386 | set_current_program_space (current_inferior ()->pspace); | |
3387 | handle_vfork_child_exec_or_exit (0); | |
3388 | target_terminal_ours (); /* Must do this before mourn anyway. */ | |
3389 | ||
3390 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
3391 | { | |
3392 | /* Record the exit code in the convenience variable $_exitcode, so | |
3393 | that the user can inspect this again later. */ | |
3394 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
3395 | (LONGEST) ecs->ws.value.integer); | |
3396 | ||
3397 | /* Also record this in the inferior itself. */ | |
3398 | current_inferior ()->has_exit_code = 1; | |
3399 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
3400 | ||
3401 | print_exited_reason (ecs->ws.value.integer); | |
3402 | } | |
3403 | else | |
3404 | print_signal_exited_reason (ecs->ws.value.sig); | |
3405 | ||
3406 | gdb_flush (gdb_stdout); | |
3407 | target_mourn_inferior (); | |
3408 | singlestep_breakpoints_inserted_p = 0; | |
3409 | cancel_single_step_breakpoints (); | |
3410 | stop_print_frame = 0; | |
3411 | stop_stepping (ecs); | |
3412 | return; | |
3413 | ||
3414 | /* The following are the only cases in which we keep going; | |
3415 | the above cases end in a continue or goto. */ | |
3416 | case TARGET_WAITKIND_FORKED: | |
3417 | case TARGET_WAITKIND_VFORKED: | |
3418 | if (debug_infrun) | |
3419 | { | |
3420 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
3421 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
3422 | else | |
3423 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
3424 | } | |
3425 | ||
3426 | /* Check whether the inferior is displaced stepping. */ | |
3427 | { | |
3428 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
3429 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3430 | struct displaced_step_inferior_state *displaced | |
3431 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
3432 | ||
3433 | /* If checking displaced stepping is supported, and thread | |
3434 | ecs->ptid is displaced stepping. */ | |
3435 | if (displaced && ptid_equal (displaced->step_ptid, ecs->ptid)) | |
3436 | { | |
3437 | struct inferior *parent_inf | |
3438 | = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
3439 | struct regcache *child_regcache; | |
3440 | CORE_ADDR parent_pc; | |
3441 | ||
3442 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
3443 | indicating that the displaced stepping of syscall instruction | |
3444 | has been done. Perform cleanup for parent process here. Note | |
3445 | that this operation also cleans up the child process for vfork, | |
3446 | because their pages are shared. */ | |
3447 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); | |
3448 | ||
3449 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
3450 | { | |
3451 | /* Restore scratch pad for child process. */ | |
3452 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
3453 | } | |
3454 | ||
3455 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
3456 | the child's PC is also within the scratchpad. Set the child's PC | |
3457 | to the parent's PC value, which has already been fixed up. | |
3458 | FIXME: we use the parent's aspace here, although we're touching | |
3459 | the child, because the child hasn't been added to the inferior | |
3460 | list yet at this point. */ | |
3461 | ||
3462 | child_regcache | |
3463 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
3464 | gdbarch, | |
3465 | parent_inf->aspace); | |
3466 | /* Read PC value of parent process. */ | |
3467 | parent_pc = regcache_read_pc (regcache); | |
3468 | ||
3469 | if (debug_displaced) | |
3470 | fprintf_unfiltered (gdb_stdlog, | |
3471 | "displaced: write child pc from %s to %s\n", | |
3472 | paddress (gdbarch, | |
3473 | regcache_read_pc (child_regcache)), | |
3474 | paddress (gdbarch, parent_pc)); | |
3475 | ||
3476 | regcache_write_pc (child_regcache, parent_pc); | |
3477 | } | |
3478 | } | |
3479 | ||
3480 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3481 | context_switch (ecs->ptid); | |
3482 | ||
3483 | /* Immediately detach breakpoints from the child before there's | |
3484 | any chance of letting the user delete breakpoints from the | |
3485 | breakpoint lists. If we don't do this early, it's easy to | |
3486 | leave left over traps in the child, vis: "break foo; catch | |
3487 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
3488 | the fork on the last `continue', and by that time the | |
3489 | breakpoint at "foo" is long gone from the breakpoint table. | |
3490 | If we vforked, then we don't need to unpatch here, since both | |
3491 | parent and child are sharing the same memory pages; we'll | |
3492 | need to unpatch at follow/detach time instead to be certain | |
3493 | that new breakpoints added between catchpoint hit time and | |
3494 | vfork follow are detached. */ | |
3495 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
3496 | { | |
3497 | /* This won't actually modify the breakpoint list, but will | |
3498 | physically remove the breakpoints from the child. */ | |
3499 | detach_breakpoints (ecs->ws.value.related_pid); | |
3500 | } | |
3501 | ||
3502 | if (singlestep_breakpoints_inserted_p) | |
3503 | { | |
3504 | /* Pull the single step breakpoints out of the target. */ | |
3505 | remove_single_step_breakpoints (); | |
3506 | singlestep_breakpoints_inserted_p = 0; | |
3507 | } | |
3508 | ||
3509 | /* In case the event is caught by a catchpoint, remember that | |
3510 | the event is to be followed at the next resume of the thread, | |
3511 | and not immediately. */ | |
3512 | ecs->event_thread->pending_follow = ecs->ws; | |
3513 | ||
3514 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
3515 | ||
3516 | ecs->event_thread->control.stop_bpstat | |
3517 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
3518 | stop_pc, ecs->ptid, &ecs->ws); | |
3519 | ||
3520 | /* Note that we're interested in knowing the bpstat actually | |
3521 | causes a stop, not just if it may explain the signal. | |
3522 | Software watchpoints, for example, always appear in the | |
3523 | bpstat. */ | |
3524 | ecs->random_signal | |
3525 | = !bpstat_causes_stop (ecs->event_thread->control.stop_bpstat); | |
3526 | ||
3527 | /* If no catchpoint triggered for this, then keep going. */ | |
3528 | if (ecs->random_signal) | |
3529 | { | |
3530 | ptid_t parent; | |
3531 | ptid_t child; | |
3532 | int should_resume; | |
3533 | int follow_child | |
3534 | = (follow_fork_mode_string == follow_fork_mode_child); | |
3535 | ||
3536 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
3537 | ||
3538 | should_resume = follow_fork (); | |
3539 | ||
3540 | parent = ecs->ptid; | |
3541 | child = ecs->ws.value.related_pid; | |
3542 | ||
3543 | /* In non-stop mode, also resume the other branch. */ | |
3544 | if (non_stop && !detach_fork) | |
3545 | { | |
3546 | if (follow_child) | |
3547 | switch_to_thread (parent); | |
3548 | else | |
3549 | switch_to_thread (child); | |
3550 | ||
3551 | ecs->event_thread = inferior_thread (); | |
3552 | ecs->ptid = inferior_ptid; | |
3553 | keep_going (ecs); | |
3554 | } | |
3555 | ||
3556 | if (follow_child) | |
3557 | switch_to_thread (child); | |
3558 | else | |
3559 | switch_to_thread (parent); | |
3560 | ||
3561 | ecs->event_thread = inferior_thread (); | |
3562 | ecs->ptid = inferior_ptid; | |
3563 | ||
3564 | if (should_resume) | |
3565 | keep_going (ecs); | |
3566 | else | |
3567 | stop_stepping (ecs); | |
3568 | return; | |
3569 | } | |
3570 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_TRAP; | |
3571 | goto process_event_stop_test; | |
3572 | ||
3573 | case TARGET_WAITKIND_VFORK_DONE: | |
3574 | /* Done with the shared memory region. Re-insert breakpoints in | |
3575 | the parent, and keep going. */ | |
3576 | ||
3577 | if (debug_infrun) | |
3578 | fprintf_unfiltered (gdb_stdlog, | |
3579 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
3580 | ||
3581 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3582 | context_switch (ecs->ptid); | |
3583 | ||
3584 | current_inferior ()->waiting_for_vfork_done = 0; | |
3585 | current_inferior ()->pspace->breakpoints_not_allowed = 0; | |
3586 | /* This also takes care of reinserting breakpoints in the | |
3587 | previously locked inferior. */ | |
3588 | keep_going (ecs); | |
3589 | return; | |
3590 | ||
3591 | case TARGET_WAITKIND_EXECD: | |
3592 | if (debug_infrun) | |
3593 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); | |
3594 | ||
3595 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3596 | context_switch (ecs->ptid); | |
3597 | ||
3598 | singlestep_breakpoints_inserted_p = 0; | |
3599 | cancel_single_step_breakpoints (); | |
3600 | ||
3601 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
3602 | ||
3603 | /* Do whatever is necessary to the parent branch of the vfork. */ | |
3604 | handle_vfork_child_exec_or_exit (1); | |
3605 | ||
3606 | /* This causes the eventpoints and symbol table to be reset. | |
3607 | Must do this now, before trying to determine whether to | |
3608 | stop. */ | |
3609 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); | |
3610 | ||
3611 | ecs->event_thread->control.stop_bpstat | |
3612 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
3613 | stop_pc, ecs->ptid, &ecs->ws); | |
3614 | ecs->random_signal | |
3615 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat); | |
3616 | ||
3617 | /* Note that this may be referenced from inside | |
3618 | bpstat_stop_status above, through inferior_has_execd. */ | |
3619 | xfree (ecs->ws.value.execd_pathname); | |
3620 | ecs->ws.value.execd_pathname = NULL; | |
3621 | ||
3622 | /* If no catchpoint triggered for this, then keep going. */ | |
3623 | if (ecs->random_signal) | |
3624 | { | |
3625 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
3626 | keep_going (ecs); | |
3627 | return; | |
3628 | } | |
3629 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_TRAP; | |
3630 | goto process_event_stop_test; | |
3631 | ||
3632 | /* Be careful not to try to gather much state about a thread | |
3633 | that's in a syscall. It's frequently a losing proposition. */ | |
3634 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
3635 | if (debug_infrun) | |
3636 | fprintf_unfiltered (gdb_stdlog, | |
3637 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
3638 | /* Getting the current syscall number. */ | |
3639 | if (handle_syscall_event (ecs) != 0) | |
3640 | return; | |
3641 | goto process_event_stop_test; | |
3642 | ||
3643 | /* Before examining the threads further, step this thread to | |
3644 | get it entirely out of the syscall. (We get notice of the | |
3645 | event when the thread is just on the verge of exiting a | |
3646 | syscall. Stepping one instruction seems to get it back | |
3647 | into user code.) */ | |
3648 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
3649 | if (debug_infrun) | |
3650 | fprintf_unfiltered (gdb_stdlog, | |
3651 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
3652 | if (handle_syscall_event (ecs) != 0) | |
3653 | return; | |
3654 | goto process_event_stop_test; | |
3655 | ||
3656 | case TARGET_WAITKIND_STOPPED: | |
3657 | if (debug_infrun) | |
3658 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); | |
3659 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; | |
3660 | break; | |
3661 | ||
3662 | case TARGET_WAITKIND_NO_HISTORY: | |
3663 | if (debug_infrun) | |
3664 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
3665 | /* Reverse execution: target ran out of history info. */ | |
3666 | ||
3667 | /* Pull the single step breakpoints out of the target. */ | |
3668 | if (singlestep_breakpoints_inserted_p) | |
3669 | { | |
3670 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3671 | context_switch (ecs->ptid); | |
3672 | remove_single_step_breakpoints (); | |
3673 | singlestep_breakpoints_inserted_p = 0; | |
3674 | } | |
3675 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
3676 | print_no_history_reason (); | |
3677 | stop_stepping (ecs); | |
3678 | return; | |
3679 | } | |
3680 | ||
3681 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED) | |
3682 | { | |
3683 | /* Do we need to clean up the state of a thread that has | |
3684 | completed a displaced single-step? (Doing so usually affects | |
3685 | the PC, so do it here, before we set stop_pc.) */ | |
3686 | displaced_step_fixup (ecs->ptid, | |
3687 | ecs->event_thread->suspend.stop_signal); | |
3688 | ||
3689 | /* If we either finished a single-step or hit a breakpoint, but | |
3690 | the user wanted this thread to be stopped, pretend we got a | |
3691 | SIG0 (generic unsignaled stop). */ | |
3692 | ||
3693 | if (ecs->event_thread->stop_requested | |
3694 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
3695 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
3696 | } | |
3697 | ||
3698 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
3699 | ||
3700 | if (debug_infrun) | |
3701 | { | |
3702 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
3703 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3704 | struct cleanup *old_chain = save_inferior_ptid (); | |
3705 | ||
3706 | inferior_ptid = ecs->ptid; | |
3707 | ||
3708 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
3709 | paddress (gdbarch, stop_pc)); | |
3710 | if (target_stopped_by_watchpoint ()) | |
3711 | { | |
3712 | CORE_ADDR addr; | |
3713 | ||
3714 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); | |
3715 | ||
3716 | if (target_stopped_data_address (¤t_target, &addr)) | |
3717 | fprintf_unfiltered (gdb_stdlog, | |
3718 | "infrun: stopped data address = %s\n", | |
3719 | paddress (gdbarch, addr)); | |
3720 | else | |
3721 | fprintf_unfiltered (gdb_stdlog, | |
3722 | "infrun: (no data address available)\n"); | |
3723 | } | |
3724 | ||
3725 | do_cleanups (old_chain); | |
3726 | } | |
3727 | ||
3728 | if (stepping_past_singlestep_breakpoint) | |
3729 | { | |
3730 | gdb_assert (singlestep_breakpoints_inserted_p); | |
3731 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); | |
3732 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
3733 | ||
3734 | stepping_past_singlestep_breakpoint = 0; | |
3735 | ||
3736 | /* We've either finished single-stepping past the single-step | |
3737 | breakpoint, or stopped for some other reason. It would be nice if | |
3738 | we could tell, but we can't reliably. */ | |
3739 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
3740 | { | |
3741 | if (debug_infrun) | |
3742 | fprintf_unfiltered (gdb_stdlog, | |
3743 | "infrun: stepping_past_" | |
3744 | "singlestep_breakpoint\n"); | |
3745 | /* Pull the single step breakpoints out of the target. */ | |
3746 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3747 | context_switch (ecs->ptid); | |
3748 | remove_single_step_breakpoints (); | |
3749 | singlestep_breakpoints_inserted_p = 0; | |
3750 | ||
3751 | ecs->random_signal = 0; | |
3752 | ecs->event_thread->control.trap_expected = 0; | |
3753 | ||
3754 | context_switch (saved_singlestep_ptid); | |
3755 | if (deprecated_context_hook) | |
3756 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
3757 | ||
3758 | resume (1, GDB_SIGNAL_0); | |
3759 | prepare_to_wait (ecs); | |
3760 | return; | |
3761 | } | |
3762 | } | |
3763 | ||
3764 | if (!ptid_equal (deferred_step_ptid, null_ptid)) | |
3765 | { | |
3766 | /* In non-stop mode, there's never a deferred_step_ptid set. */ | |
3767 | gdb_assert (!non_stop); | |
3768 | ||
3769 | /* If we stopped for some other reason than single-stepping, ignore | |
3770 | the fact that we were supposed to switch back. */ | |
3771 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
3772 | { | |
3773 | if (debug_infrun) | |
3774 | fprintf_unfiltered (gdb_stdlog, | |
3775 | "infrun: handling deferred step\n"); | |
3776 | ||
3777 | /* Pull the single step breakpoints out of the target. */ | |
3778 | if (singlestep_breakpoints_inserted_p) | |
3779 | { | |
3780 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3781 | context_switch (ecs->ptid); | |
3782 | remove_single_step_breakpoints (); | |
3783 | singlestep_breakpoints_inserted_p = 0; | |
3784 | } | |
3785 | ||
3786 | ecs->event_thread->control.trap_expected = 0; | |
3787 | ||
3788 | context_switch (deferred_step_ptid); | |
3789 | deferred_step_ptid = null_ptid; | |
3790 | /* Suppress spurious "Switching to ..." message. */ | |
3791 | previous_inferior_ptid = inferior_ptid; | |
3792 | ||
3793 | resume (1, GDB_SIGNAL_0); | |
3794 | prepare_to_wait (ecs); | |
3795 | return; | |
3796 | } | |
3797 | ||
3798 | deferred_step_ptid = null_ptid; | |
3799 | } | |
3800 | ||
3801 | /* See if a thread hit a thread-specific breakpoint that was meant for | |
3802 | another thread. If so, then step that thread past the breakpoint, | |
3803 | and continue it. */ | |
3804 | ||
3805 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
3806 | { | |
3807 | int thread_hop_needed = 0; | |
3808 | struct address_space *aspace = | |
3809 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
3810 | ||
3811 | /* Check if a regular breakpoint has been hit before checking | |
3812 | for a potential single step breakpoint. Otherwise, GDB will | |
3813 | not see this breakpoint hit when stepping onto breakpoints. */ | |
3814 | if (regular_breakpoint_inserted_here_p (aspace, stop_pc)) | |
3815 | { | |
3816 | ecs->random_signal = 0; | |
3817 | if (!breakpoint_thread_match (aspace, stop_pc, ecs->ptid)) | |
3818 | thread_hop_needed = 1; | |
3819 | } | |
3820 | else if (singlestep_breakpoints_inserted_p) | |
3821 | { | |
3822 | /* We have not context switched yet, so this should be true | |
3823 | no matter which thread hit the singlestep breakpoint. */ | |
3824 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
3825 | if (debug_infrun) | |
3826 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
3827 | "trap for %s\n", | |
3828 | target_pid_to_str (ecs->ptid)); | |
3829 | ||
3830 | ecs->random_signal = 0; | |
3831 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
3832 | change when we go from single-threaded to multi-threaded. If | |
3833 | the singlestep_ptid is still in the list, assume that it is | |
3834 | really different from ecs->ptid. */ | |
3835 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
3836 | && in_thread_list (singlestep_ptid)) | |
3837 | { | |
3838 | /* If the PC of the thread we were trying to single-step | |
3839 | has changed, discard this event (which we were going | |
3840 | to ignore anyway), and pretend we saw that thread | |
3841 | trap. This prevents us continuously moving the | |
3842 | single-step breakpoint forward, one instruction at a | |
3843 | time. If the PC has changed, then the thread we were | |
3844 | trying to single-step has trapped or been signalled, | |
3845 | but the event has not been reported to GDB yet. | |
3846 | ||
3847 | There might be some cases where this loses signal | |
3848 | information, if a signal has arrived at exactly the | |
3849 | same time that the PC changed, but this is the best | |
3850 | we can do with the information available. Perhaps we | |
3851 | should arrange to report all events for all threads | |
3852 | when they stop, or to re-poll the remote looking for | |
3853 | this particular thread (i.e. temporarily enable | |
3854 | schedlock). */ | |
3855 | ||
3856 | CORE_ADDR new_singlestep_pc | |
3857 | = regcache_read_pc (get_thread_regcache (singlestep_ptid)); | |
3858 | ||
3859 | if (new_singlestep_pc != singlestep_pc) | |
3860 | { | |
3861 | enum gdb_signal stop_signal; | |
3862 | ||
3863 | if (debug_infrun) | |
3864 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
3865 | " but expected thread advanced also\n"); | |
3866 | ||
3867 | /* The current context still belongs to | |
3868 | singlestep_ptid. Don't swap here, since that's | |
3869 | the context we want to use. Just fudge our | |
3870 | state and continue. */ | |
3871 | stop_signal = ecs->event_thread->suspend.stop_signal; | |
3872 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
3873 | ecs->ptid = singlestep_ptid; | |
3874 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
3875 | ecs->event_thread->suspend.stop_signal = stop_signal; | |
3876 | stop_pc = new_singlestep_pc; | |
3877 | } | |
3878 | else | |
3879 | { | |
3880 | if (debug_infrun) | |
3881 | fprintf_unfiltered (gdb_stdlog, | |
3882 | "infrun: unexpected thread\n"); | |
3883 | ||
3884 | thread_hop_needed = 1; | |
3885 | stepping_past_singlestep_breakpoint = 1; | |
3886 | saved_singlestep_ptid = singlestep_ptid; | |
3887 | } | |
3888 | } | |
3889 | } | |
3890 | ||
3891 | if (thread_hop_needed) | |
3892 | { | |
3893 | struct regcache *thread_regcache; | |
3894 | int remove_status = 0; | |
3895 | ||
3896 | if (debug_infrun) | |
3897 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); | |
3898 | ||
3899 | /* Switch context before touching inferior memory, the | |
3900 | previous thread may have exited. */ | |
3901 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
3902 | context_switch (ecs->ptid); | |
3903 | ||
3904 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
3905 | Just continue. */ | |
3906 | ||
3907 | if (singlestep_breakpoints_inserted_p) | |
3908 | { | |
3909 | /* Pull the single step breakpoints out of the target. */ | |
3910 | remove_single_step_breakpoints (); | |
3911 | singlestep_breakpoints_inserted_p = 0; | |
3912 | } | |
3913 | ||
3914 | /* If the arch can displace step, don't remove the | |
3915 | breakpoints. */ | |
3916 | thread_regcache = get_thread_regcache (ecs->ptid); | |
3917 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) | |
3918 | remove_status = remove_breakpoints (); | |
3919 | ||
3920 | /* Did we fail to remove breakpoints? If so, try | |
3921 | to set the PC past the bp. (There's at least | |
3922 | one situation in which we can fail to remove | |
3923 | the bp's: On HP-UX's that use ttrace, we can't | |
3924 | change the address space of a vforking child | |
3925 | process until the child exits (well, okay, not | |
3926 | then either :-) or execs. */ | |
3927 | if (remove_status != 0) | |
3928 | error (_("Cannot step over breakpoint hit in wrong thread")); | |
3929 | else | |
3930 | { /* Single step */ | |
3931 | if (!non_stop) | |
3932 | { | |
3933 | /* Only need to require the next event from this | |
3934 | thread in all-stop mode. */ | |
3935 | waiton_ptid = ecs->ptid; | |
3936 | infwait_state = infwait_thread_hop_state; | |
3937 | } | |
3938 | ||
3939 | ecs->event_thread->stepping_over_breakpoint = 1; | |
3940 | keep_going (ecs); | |
3941 | return; | |
3942 | } | |
3943 | } | |
3944 | else if (singlestep_breakpoints_inserted_p) | |
3945 | { | |
3946 | ecs->random_signal = 0; | |
3947 | } | |
3948 | } | |
3949 | else | |
3950 | ecs->random_signal = 1; | |
3951 | ||
3952 | /* See if something interesting happened to the non-current thread. If | |
3953 | so, then switch to that thread. */ | |
3954 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3955 | { | |
3956 | if (debug_infrun) | |
3957 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); | |
3958 | ||
3959 | context_switch (ecs->ptid); | |
3960 | ||
3961 | if (deprecated_context_hook) | |
3962 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
3963 | } | |
3964 | ||
3965 | /* At this point, get hold of the now-current thread's frame. */ | |
3966 | frame = get_current_frame (); | |
3967 | gdbarch = get_frame_arch (frame); | |
3968 | ||
3969 | if (singlestep_breakpoints_inserted_p) | |
3970 | { | |
3971 | /* Pull the single step breakpoints out of the target. */ | |
3972 | remove_single_step_breakpoints (); | |
3973 | singlestep_breakpoints_inserted_p = 0; | |
3974 | } | |
3975 | ||
3976 | if (stepped_after_stopped_by_watchpoint) | |
3977 | stopped_by_watchpoint = 0; | |
3978 | else | |
3979 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
3980 | ||
3981 | /* If necessary, step over this watchpoint. We'll be back to display | |
3982 | it in a moment. */ | |
3983 | if (stopped_by_watchpoint | |
3984 | && (target_have_steppable_watchpoint | |
3985 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) | |
3986 | { | |
3987 | /* At this point, we are stopped at an instruction which has | |
3988 | attempted to write to a piece of memory under control of | |
3989 | a watchpoint. The instruction hasn't actually executed | |
3990 | yet. If we were to evaluate the watchpoint expression | |
3991 | now, we would get the old value, and therefore no change | |
3992 | would seem to have occurred. | |
3993 | ||
3994 | In order to make watchpoints work `right', we really need | |
3995 | to complete the memory write, and then evaluate the | |
3996 | watchpoint expression. We do this by single-stepping the | |
3997 | target. | |
3998 | ||
3999 | It may not be necessary to disable the watchpoint to stop over | |
4000 | it. For example, the PA can (with some kernel cooperation) | |
4001 | single step over a watchpoint without disabling the watchpoint. | |
4002 | ||
4003 | It is far more common to need to disable a watchpoint to step | |
4004 | the inferior over it. If we have non-steppable watchpoints, | |
4005 | we must disable the current watchpoint; it's simplest to | |
4006 | disable all watchpoints and breakpoints. */ | |
4007 | int hw_step = 1; | |
4008 | ||
4009 | if (!target_have_steppable_watchpoint) | |
4010 | { | |
4011 | remove_breakpoints (); | |
4012 | /* See comment in resume why we need to stop bypassing signals | |
4013 | while breakpoints have been removed. */ | |
4014 | target_pass_signals (0, NULL); | |
4015 | } | |
4016 | /* Single step */ | |
4017 | hw_step = maybe_software_singlestep (gdbarch, stop_pc); | |
4018 | target_resume (ecs->ptid, hw_step, GDB_SIGNAL_0); | |
4019 | waiton_ptid = ecs->ptid; | |
4020 | if (target_have_steppable_watchpoint) | |
4021 | infwait_state = infwait_step_watch_state; | |
4022 | else | |
4023 | infwait_state = infwait_nonstep_watch_state; | |
4024 | prepare_to_wait (ecs); | |
4025 | return; | |
4026 | } | |
4027 | ||
4028 | clear_stop_func (ecs); | |
4029 | ecs->event_thread->stepping_over_breakpoint = 0; | |
4030 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); | |
4031 | ecs->event_thread->control.stop_step = 0; | |
4032 | stop_print_frame = 1; | |
4033 | ecs->random_signal = 0; | |
4034 | stopped_by_random_signal = 0; | |
4035 | ||
4036 | /* Hide inlined functions starting here, unless we just performed stepi or | |
4037 | nexti. After stepi and nexti, always show the innermost frame (not any | |
4038 | inline function call sites). */ | |
4039 | if (ecs->event_thread->control.step_range_end != 1) | |
4040 | { | |
4041 | struct address_space *aspace = | |
4042 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
4043 | ||
4044 | /* skip_inline_frames is expensive, so we avoid it if we can | |
4045 | determine that the address is one where functions cannot have | |
4046 | been inlined. This improves performance with inferiors that | |
4047 | load a lot of shared libraries, because the solib event | |
4048 | breakpoint is defined as the address of a function (i.e. not | |
4049 | inline). Note that we have to check the previous PC as well | |
4050 | as the current one to catch cases when we have just | |
4051 | single-stepped off a breakpoint prior to reinstating it. | |
4052 | Note that we're assuming that the code we single-step to is | |
4053 | not inline, but that's not definitive: there's nothing | |
4054 | preventing the event breakpoint function from containing | |
4055 | inlined code, and the single-step ending up there. If the | |
4056 | user had set a breakpoint on that inlined code, the missing | |
4057 | skip_inline_frames call would break things. Fortunately | |
4058 | that's an extremely unlikely scenario. */ | |
4059 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) | |
4060 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
4061 | && ecs->event_thread->control.trap_expected | |
4062 | && pc_at_non_inline_function (aspace, | |
4063 | ecs->event_thread->prev_pc, | |
4064 | &ecs->ws))) | |
4065 | { | |
4066 | skip_inline_frames (ecs->ptid); | |
4067 | ||
4068 | /* Re-fetch current thread's frame in case that invalidated | |
4069 | the frame cache. */ | |
4070 | frame = get_current_frame (); | |
4071 | gdbarch = get_frame_arch (frame); | |
4072 | } | |
4073 | } | |
4074 | ||
4075 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
4076 | && ecs->event_thread->control.trap_expected | |
4077 | && gdbarch_single_step_through_delay_p (gdbarch) | |
4078 | && currently_stepping (ecs->event_thread)) | |
4079 | { | |
4080 | /* We're trying to step off a breakpoint. Turns out that we're | |
4081 | also on an instruction that needs to be stepped multiple | |
4082 | times before it's been fully executing. E.g., architectures | |
4083 | with a delay slot. It needs to be stepped twice, once for | |
4084 | the instruction and once for the delay slot. */ | |
4085 | int step_through_delay | |
4086 | = gdbarch_single_step_through_delay (gdbarch, frame); | |
4087 | ||
4088 | if (debug_infrun && step_through_delay) | |
4089 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); | |
4090 | if (ecs->event_thread->control.step_range_end == 0 | |
4091 | && step_through_delay) | |
4092 | { | |
4093 | /* The user issued a continue when stopped at a breakpoint. | |
4094 | Set up for another trap and get out of here. */ | |
4095 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4096 | keep_going (ecs); | |
4097 | return; | |
4098 | } | |
4099 | else if (step_through_delay) | |
4100 | { | |
4101 | /* The user issued a step when stopped at a breakpoint. | |
4102 | Maybe we should stop, maybe we should not - the delay | |
4103 | slot *might* correspond to a line of source. In any | |
4104 | case, don't decide that here, just set | |
4105 | ecs->stepping_over_breakpoint, making sure we | |
4106 | single-step again before breakpoints are re-inserted. */ | |
4107 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4108 | } | |
4109 | } | |
4110 | ||
4111 | /* Look at the cause of the stop, and decide what to do. | |
4112 | The alternatives are: | |
4113 | 1) stop_stepping and return; to really stop and return to the debugger, | |
4114 | 2) keep_going and return to start up again | |
4115 | (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once) | |
4116 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
4117 | will be made according to the signal handling tables. */ | |
4118 | ||
4119 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
4120 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
4121 | || stop_soon == STOP_QUIETLY_REMOTE) | |
4122 | { | |
4123 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
4124 | && stop_after_trap) | |
4125 | { | |
4126 | if (debug_infrun) | |
4127 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
4128 | stop_print_frame = 0; | |
4129 | stop_stepping (ecs); | |
4130 | return; | |
4131 | } | |
4132 | ||
4133 | /* This is originated from start_remote(), start_inferior() and | |
4134 | shared libraries hook functions. */ | |
4135 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) | |
4136 | { | |
4137 | if (debug_infrun) | |
4138 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
4139 | stop_stepping (ecs); | |
4140 | return; | |
4141 | } | |
4142 | ||
4143 | /* This originates from attach_command(). We need to overwrite | |
4144 | the stop_signal here, because some kernels don't ignore a | |
4145 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
4146 | See more comments in inferior.h. On the other hand, if we | |
4147 | get a non-SIGSTOP, report it to the user - assume the backend | |
4148 | will handle the SIGSTOP if it should show up later. | |
4149 | ||
4150 | Also consider that the attach is complete when we see a | |
4151 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
4152 | target extended-remote report it instead of a SIGSTOP | |
4153 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
4154 | signal, so this is no exception. | |
4155 | ||
4156 | Also consider that the attach is complete when we see a | |
4157 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
4158 | the target to stop all threads of the inferior, in case the | |
4159 | low level attach operation doesn't stop them implicitly. If | |
4160 | they weren't stopped implicitly, then the stub will report a | |
4161 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
4162 | other than GDB's request. */ | |
4163 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
4164 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
4165 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
4166 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
4167 | { | |
4168 | stop_stepping (ecs); | |
4169 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
4170 | return; | |
4171 | } | |
4172 | ||
4173 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that | |
4174 | handles this event. */ | |
4175 | ecs->event_thread->control.stop_bpstat | |
4176 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
4177 | stop_pc, ecs->ptid, &ecs->ws); | |
4178 | ||
4179 | /* Following in case break condition called a | |
4180 | function. */ | |
4181 | stop_print_frame = 1; | |
4182 | ||
4183 | /* This is where we handle "moribund" watchpoints. Unlike | |
4184 | software breakpoints traps, hardware watchpoint traps are | |
4185 | always distinguishable from random traps. If no high-level | |
4186 | watchpoint is associated with the reported stop data address | |
4187 | anymore, then the bpstat does not explain the signal --- | |
4188 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
4189 | set. */ | |
4190 | ||
4191 | if (debug_infrun | |
4192 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
4193 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat) | |
4194 | && stopped_by_watchpoint) | |
4195 | fprintf_unfiltered (gdb_stdlog, | |
4196 | "infrun: no user watchpoint explains " | |
4197 | "watchpoint SIGTRAP, ignoring\n"); | |
4198 | ||
4199 | /* NOTE: cagney/2003-03-29: These two checks for a random signal | |
4200 | at one stage in the past included checks for an inferior | |
4201 | function call's call dummy's return breakpoint. The original | |
4202 | comment, that went with the test, read: | |
4203 | ||
4204 | ``End of a stack dummy. Some systems (e.g. Sony news) give | |
4205 | another signal besides SIGTRAP, so check here as well as | |
4206 | above.'' | |
4207 | ||
4208 | If someone ever tries to get call dummys on a | |
4209 | non-executable stack to work (where the target would stop | |
4210 | with something like a SIGSEGV), then those tests might need | |
4211 | to be re-instated. Given, however, that the tests were only | |
4212 | enabled when momentary breakpoints were not being used, I | |
4213 | suspect that it won't be the case. | |
4214 | ||
4215 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to | |
4216 | be necessary for call dummies on a non-executable stack on | |
4217 | SPARC. */ | |
4218 | ||
4219 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
4220 | ecs->random_signal | |
4221 | = !(bpstat_explains_signal (ecs->event_thread->control.stop_bpstat) | |
4222 | || stopped_by_watchpoint | |
4223 | || ecs->event_thread->control.trap_expected | |
4224 | || (ecs->event_thread->control.step_range_end | |
4225 | && (ecs->event_thread->control.step_resume_breakpoint | |
4226 | == NULL))); | |
4227 | else | |
4228 | { | |
4229 | ecs->random_signal = !bpstat_explains_signal | |
4230 | (ecs->event_thread->control.stop_bpstat); | |
4231 | if (!ecs->random_signal) | |
4232 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_TRAP; | |
4233 | } | |
4234 | } | |
4235 | ||
4236 | /* When we reach this point, we've pretty much decided | |
4237 | that the reason for stopping must've been a random | |
4238 | (unexpected) signal. */ | |
4239 | ||
4240 | else | |
4241 | ecs->random_signal = 1; | |
4242 | ||
4243 | process_event_stop_test: | |
4244 | ||
4245 | /* Re-fetch current thread's frame in case we did a | |
4246 | "goto process_event_stop_test" above. */ | |
4247 | frame = get_current_frame (); | |
4248 | gdbarch = get_frame_arch (frame); | |
4249 | ||
4250 | /* For the program's own signals, act according to | |
4251 | the signal handling tables. */ | |
4252 | ||
4253 | if (ecs->random_signal) | |
4254 | { | |
4255 | /* Signal not for debugging purposes. */ | |
4256 | int printed = 0; | |
4257 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
4258 | ||
4259 | if (debug_infrun) | |
4260 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", | |
4261 | ecs->event_thread->suspend.stop_signal); | |
4262 | ||
4263 | stopped_by_random_signal = 1; | |
4264 | ||
4265 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
4266 | { | |
4267 | printed = 1; | |
4268 | target_terminal_ours_for_output (); | |
4269 | print_signal_received_reason | |
4270 | (ecs->event_thread->suspend.stop_signal); | |
4271 | } | |
4272 | /* Always stop on signals if we're either just gaining control | |
4273 | of the program, or the user explicitly requested this thread | |
4274 | to remain stopped. */ | |
4275 | if (stop_soon != NO_STOP_QUIETLY | |
4276 | || ecs->event_thread->stop_requested | |
4277 | || (!inf->detaching | |
4278 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) | |
4279 | { | |
4280 | stop_stepping (ecs); | |
4281 | return; | |
4282 | } | |
4283 | /* If not going to stop, give terminal back | |
4284 | if we took it away. */ | |
4285 | else if (printed) | |
4286 | target_terminal_inferior (); | |
4287 | ||
4288 | /* Clear the signal if it should not be passed. */ | |
4289 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) | |
4290 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
4291 | ||
4292 | if (ecs->event_thread->prev_pc == stop_pc | |
4293 | && ecs->event_thread->control.trap_expected | |
4294 | && ecs->event_thread->control.step_resume_breakpoint == NULL) | |
4295 | { | |
4296 | /* We were just starting a new sequence, attempting to | |
4297 | single-step off of a breakpoint and expecting a SIGTRAP. | |
4298 | Instead this signal arrives. This signal will take us out | |
4299 | of the stepping range so GDB needs to remember to, when | |
4300 | the signal handler returns, resume stepping off that | |
4301 | breakpoint. */ | |
4302 | /* To simplify things, "continue" is forced to use the same | |
4303 | code paths as single-step - set a breakpoint at the | |
4304 | signal return address and then, once hit, step off that | |
4305 | breakpoint. */ | |
4306 | if (debug_infrun) | |
4307 | fprintf_unfiltered (gdb_stdlog, | |
4308 | "infrun: signal arrived while stepping over " | |
4309 | "breakpoint\n"); | |
4310 | ||
4311 | insert_hp_step_resume_breakpoint_at_frame (frame); | |
4312 | ecs->event_thread->step_after_step_resume_breakpoint = 1; | |
4313 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ | |
4314 | ecs->event_thread->control.trap_expected = 0; | |
4315 | keep_going (ecs); | |
4316 | return; | |
4317 | } | |
4318 | ||
4319 | if (ecs->event_thread->control.step_range_end != 0 | |
4320 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 | |
4321 | && (ecs->event_thread->control.step_range_start <= stop_pc | |
4322 | && stop_pc < ecs->event_thread->control.step_range_end) | |
4323 | && frame_id_eq (get_stack_frame_id (frame), | |
4324 | ecs->event_thread->control.step_stack_frame_id) | |
4325 | && ecs->event_thread->control.step_resume_breakpoint == NULL) | |
4326 | { | |
4327 | /* The inferior is about to take a signal that will take it | |
4328 | out of the single step range. Set a breakpoint at the | |
4329 | current PC (which is presumably where the signal handler | |
4330 | will eventually return) and then allow the inferior to | |
4331 | run free. | |
4332 | ||
4333 | Note that this is only needed for a signal delivered | |
4334 | while in the single-step range. Nested signals aren't a | |
4335 | problem as they eventually all return. */ | |
4336 | if (debug_infrun) | |
4337 | fprintf_unfiltered (gdb_stdlog, | |
4338 | "infrun: signal may take us out of " | |
4339 | "single-step range\n"); | |
4340 | ||
4341 | insert_hp_step_resume_breakpoint_at_frame (frame); | |
4342 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ | |
4343 | ecs->event_thread->control.trap_expected = 0; | |
4344 | keep_going (ecs); | |
4345 | return; | |
4346 | } | |
4347 | ||
4348 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
4349 | when either there's a nested signal, or when there's a | |
4350 | pending signal enabled just as the signal handler returns | |
4351 | (leaving the inferior at the step-resume-breakpoint without | |
4352 | actually executing it). Either way continue until the | |
4353 | breakpoint is really hit. */ | |
4354 | } | |
4355 | else | |
4356 | { | |
4357 | /* Handle cases caused by hitting a breakpoint. */ | |
4358 | ||
4359 | CORE_ADDR jmp_buf_pc; | |
4360 | struct bpstat_what what; | |
4361 | ||
4362 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); | |
4363 | ||
4364 | if (what.call_dummy) | |
4365 | { | |
4366 | stop_stack_dummy = what.call_dummy; | |
4367 | } | |
4368 | ||
4369 | /* If we hit an internal event that triggers symbol changes, the | |
4370 | current frame will be invalidated within bpstat_what (e.g., | |
4371 | if we hit an internal solib event). Re-fetch it. */ | |
4372 | frame = get_current_frame (); | |
4373 | gdbarch = get_frame_arch (frame); | |
4374 | ||
4375 | switch (what.main_action) | |
4376 | { | |
4377 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
4378 | /* If we hit the breakpoint at longjmp while stepping, we | |
4379 | install a momentary breakpoint at the target of the | |
4380 | jmp_buf. */ | |
4381 | ||
4382 | if (debug_infrun) | |
4383 | fprintf_unfiltered (gdb_stdlog, | |
4384 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
4385 | ||
4386 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4387 | ||
4388 | if (what.is_longjmp) | |
4389 | { | |
4390 | struct value *arg_value; | |
4391 | ||
4392 | /* If we set the longjmp breakpoint via a SystemTap | |
4393 | probe, then use it to extract the arguments. The | |
4394 | destination PC is the third argument to the | |
4395 | probe. */ | |
4396 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
4397 | if (arg_value) | |
4398 | jmp_buf_pc = value_as_address (arg_value); | |
4399 | else if (!gdbarch_get_longjmp_target_p (gdbarch) | |
4400 | || !gdbarch_get_longjmp_target (gdbarch, | |
4401 | frame, &jmp_buf_pc)) | |
4402 | { | |
4403 | if (debug_infrun) | |
4404 | fprintf_unfiltered (gdb_stdlog, | |
4405 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
4406 | "(!gdbarch_get_longjmp_target)\n"); | |
4407 | keep_going (ecs); | |
4408 | return; | |
4409 | } | |
4410 | ||
4411 | /* Insert a breakpoint at resume address. */ | |
4412 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
4413 | } | |
4414 | else | |
4415 | check_exception_resume (ecs, frame); | |
4416 | keep_going (ecs); | |
4417 | return; | |
4418 | ||
4419 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: | |
4420 | { | |
4421 | struct frame_info *init_frame; | |
4422 | ||
4423 | /* There are several cases to consider. | |
4424 | ||
4425 | 1. The initiating frame no longer exists. In this case | |
4426 | we must stop, because the exception or longjmp has gone | |
4427 | too far. | |
4428 | ||
4429 | 2. The initiating frame exists, and is the same as the | |
4430 | current frame. We stop, because the exception or | |
4431 | longjmp has been caught. | |
4432 | ||
4433 | 3. The initiating frame exists and is different from | |
4434 | the current frame. This means the exception or longjmp | |
4435 | has been caught beneath the initiating frame, so keep | |
4436 | going. | |
4437 | ||
4438 | 4. longjmp breakpoint has been placed just to protect | |
4439 | against stale dummy frames and user is not interested | |
4440 | in stopping around longjmps. */ | |
4441 | ||
4442 | if (debug_infrun) | |
4443 | fprintf_unfiltered (gdb_stdlog, | |
4444 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
4445 | ||
4446 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint | |
4447 | != NULL); | |
4448 | delete_exception_resume_breakpoint (ecs->event_thread); | |
4449 | ||
4450 | if (what.is_longjmp) | |
4451 | { | |
4452 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread->num); | |
4453 | ||
4454 | if (!frame_id_p (ecs->event_thread->initiating_frame)) | |
4455 | { | |
4456 | /* Case 4. */ | |
4457 | keep_going (ecs); | |
4458 | return; | |
4459 | } | |
4460 | } | |
4461 | ||
4462 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); | |
4463 | ||
4464 | if (init_frame) | |
4465 | { | |
4466 | struct frame_id current_id | |
4467 | = get_frame_id (get_current_frame ()); | |
4468 | if (frame_id_eq (current_id, | |
4469 | ecs->event_thread->initiating_frame)) | |
4470 | { | |
4471 | /* Case 2. Fall through. */ | |
4472 | } | |
4473 | else | |
4474 | { | |
4475 | /* Case 3. */ | |
4476 | keep_going (ecs); | |
4477 | return; | |
4478 | } | |
4479 | } | |
4480 | ||
4481 | /* For Cases 1 and 2, remove the step-resume breakpoint, | |
4482 | if it exists. */ | |
4483 | delete_step_resume_breakpoint (ecs->event_thread); | |
4484 | ||
4485 | ecs->event_thread->control.stop_step = 1; | |
4486 | print_end_stepping_range_reason (); | |
4487 | stop_stepping (ecs); | |
4488 | } | |
4489 | return; | |
4490 | ||
4491 | case BPSTAT_WHAT_SINGLE: | |
4492 | if (debug_infrun) | |
4493 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
4494 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4495 | /* Still need to check other stuff, at least the case where | |
4496 | we are stepping and step out of the right range. */ | |
4497 | break; | |
4498 | ||
4499 | case BPSTAT_WHAT_STEP_RESUME: | |
4500 | if (debug_infrun) | |
4501 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
4502 | ||
4503 | delete_step_resume_breakpoint (ecs->event_thread); | |
4504 | if (ecs->event_thread->control.proceed_to_finish | |
4505 | && execution_direction == EXEC_REVERSE) | |
4506 | { | |
4507 | struct thread_info *tp = ecs->event_thread; | |
4508 | ||
4509 | /* We are finishing a function in reverse, and just hit | |
4510 | the step-resume breakpoint at the start address of | |
4511 | the function, and we're almost there -- just need to | |
4512 | back up by one more single-step, which should take us | |
4513 | back to the function call. */ | |
4514 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
4515 | keep_going (ecs); | |
4516 | return; | |
4517 | } | |
4518 | fill_in_stop_func (gdbarch, ecs); | |
4519 | if (stop_pc == ecs->stop_func_start | |
4520 | && execution_direction == EXEC_REVERSE) | |
4521 | { | |
4522 | /* We are stepping over a function call in reverse, and | |
4523 | just hit the step-resume breakpoint at the start | |
4524 | address of the function. Go back to single-stepping, | |
4525 | which should take us back to the function call. */ | |
4526 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4527 | keep_going (ecs); | |
4528 | return; | |
4529 | } | |
4530 | break; | |
4531 | ||
4532 | case BPSTAT_WHAT_STOP_NOISY: | |
4533 | if (debug_infrun) | |
4534 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
4535 | stop_print_frame = 1; | |
4536 | ||
4537 | /* We are about to nuke the step_resume_breakpointt via the | |
4538 | cleanup chain, so no need to worry about it here. */ | |
4539 | ||
4540 | stop_stepping (ecs); | |
4541 | return; | |
4542 | ||
4543 | case BPSTAT_WHAT_STOP_SILENT: | |
4544 | if (debug_infrun) | |
4545 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
4546 | stop_print_frame = 0; | |
4547 | ||
4548 | /* We are about to nuke the step_resume_breakpoin via the | |
4549 | cleanup chain, so no need to worry about it here. */ | |
4550 | ||
4551 | stop_stepping (ecs); | |
4552 | return; | |
4553 | ||
4554 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
4555 | if (debug_infrun) | |
4556 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
4557 | ||
4558 | delete_step_resume_breakpoint (ecs->event_thread); | |
4559 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
4560 | { | |
4561 | /* Back when the step-resume breakpoint was inserted, we | |
4562 | were trying to single-step off a breakpoint. Go back | |
4563 | to doing that. */ | |
4564 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
4565 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4566 | keep_going (ecs); | |
4567 | return; | |
4568 | } | |
4569 | break; | |
4570 | ||
4571 | case BPSTAT_WHAT_KEEP_CHECKING: | |
4572 | break; | |
4573 | } | |
4574 | } | |
4575 | ||
4576 | /* We come here if we hit a breakpoint but should not | |
4577 | stop for it. Possibly we also were stepping | |
4578 | and should stop for that. So fall through and | |
4579 | test for stepping. But, if not stepping, | |
4580 | do not stop. */ | |
4581 | ||
4582 | /* In all-stop mode, if we're currently stepping but have stopped in | |
4583 | some other thread, we need to switch back to the stepped thread. */ | |
4584 | if (!non_stop) | |
4585 | { | |
4586 | struct thread_info *tp; | |
4587 | ||
4588 | tp = iterate_over_threads (currently_stepping_or_nexting_callback, | |
4589 | ecs->event_thread); | |
4590 | if (tp) | |
4591 | { | |
4592 | /* However, if the current thread is blocked on some internal | |
4593 | breakpoint, and we simply need to step over that breakpoint | |
4594 | to get it going again, do that first. */ | |
4595 | if ((ecs->event_thread->control.trap_expected | |
4596 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
4597 | || ecs->event_thread->stepping_over_breakpoint) | |
4598 | { | |
4599 | keep_going (ecs); | |
4600 | return; | |
4601 | } | |
4602 | ||
4603 | /* If the stepping thread exited, then don't try to switch | |
4604 | back and resume it, which could fail in several different | |
4605 | ways depending on the target. Instead, just keep going. | |
4606 | ||
4607 | We can find a stepping dead thread in the thread list in | |
4608 | two cases: | |
4609 | ||
4610 | - The target supports thread exit events, and when the | |
4611 | target tries to delete the thread from the thread list, | |
4612 | inferior_ptid pointed at the exiting thread. In such | |
4613 | case, calling delete_thread does not really remove the | |
4614 | thread from the list; instead, the thread is left listed, | |
4615 | with 'exited' state. | |
4616 | ||
4617 | - The target's debug interface does not support thread | |
4618 | exit events, and so we have no idea whatsoever if the | |
4619 | previously stepping thread is still alive. For that | |
4620 | reason, we need to synchronously query the target | |
4621 | now. */ | |
4622 | if (is_exited (tp->ptid) | |
4623 | || !target_thread_alive (tp->ptid)) | |
4624 | { | |
4625 | if (debug_infrun) | |
4626 | fprintf_unfiltered (gdb_stdlog, | |
4627 | "infrun: not switching back to " | |
4628 | "stepped thread, it has vanished\n"); | |
4629 | ||
4630 | delete_thread (tp->ptid); | |
4631 | keep_going (ecs); | |
4632 | return; | |
4633 | } | |
4634 | ||
4635 | /* Otherwise, we no longer expect a trap in the current thread. | |
4636 | Clear the trap_expected flag before switching back -- this is | |
4637 | what keep_going would do as well, if we called it. */ | |
4638 | ecs->event_thread->control.trap_expected = 0; | |
4639 | ||
4640 | if (debug_infrun) | |
4641 | fprintf_unfiltered (gdb_stdlog, | |
4642 | "infrun: switching back to stepped thread\n"); | |
4643 | ||
4644 | ecs->event_thread = tp; | |
4645 | ecs->ptid = tp->ptid; | |
4646 | context_switch (ecs->ptid); | |
4647 | keep_going (ecs); | |
4648 | return; | |
4649 | } | |
4650 | } | |
4651 | ||
4652 | if (ecs->event_thread->control.step_resume_breakpoint) | |
4653 | { | |
4654 | if (debug_infrun) | |
4655 | fprintf_unfiltered (gdb_stdlog, | |
4656 | "infrun: step-resume breakpoint is inserted\n"); | |
4657 | ||
4658 | /* Having a step-resume breakpoint overrides anything | |
4659 | else having to do with stepping commands until | |
4660 | that breakpoint is reached. */ | |
4661 | keep_going (ecs); | |
4662 | return; | |
4663 | } | |
4664 | ||
4665 | if (ecs->event_thread->control.step_range_end == 0) | |
4666 | { | |
4667 | if (debug_infrun) | |
4668 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); | |
4669 | /* Likewise if we aren't even stepping. */ | |
4670 | keep_going (ecs); | |
4671 | return; | |
4672 | } | |
4673 | ||
4674 | /* Re-fetch current thread's frame in case the code above caused | |
4675 | the frame cache to be re-initialized, making our FRAME variable | |
4676 | a dangling pointer. */ | |
4677 | frame = get_current_frame (); | |
4678 | gdbarch = get_frame_arch (frame); | |
4679 | fill_in_stop_func (gdbarch, ecs); | |
4680 | ||
4681 | /* If stepping through a line, keep going if still within it. | |
4682 | ||
4683 | Note that step_range_end is the address of the first instruction | |
4684 | beyond the step range, and NOT the address of the last instruction | |
4685 | within it! | |
4686 | ||
4687 | Note also that during reverse execution, we may be stepping | |
4688 | through a function epilogue and therefore must detect when | |
4689 | the current-frame changes in the middle of a line. */ | |
4690 | ||
4691 | if (stop_pc >= ecs->event_thread->control.step_range_start | |
4692 | && stop_pc < ecs->event_thread->control.step_range_end | |
4693 | && (execution_direction != EXEC_REVERSE | |
4694 | || frame_id_eq (get_frame_id (frame), | |
4695 | ecs->event_thread->control.step_frame_id))) | |
4696 | { | |
4697 | if (debug_infrun) | |
4698 | fprintf_unfiltered | |
4699 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
4700 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
4701 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
4702 | ||
4703 | /* When stepping backward, stop at beginning of line range | |
4704 | (unless it's the function entry point, in which case | |
4705 | keep going back to the call point). */ | |
4706 | if (stop_pc == ecs->event_thread->control.step_range_start | |
4707 | && stop_pc != ecs->stop_func_start | |
4708 | && execution_direction == EXEC_REVERSE) | |
4709 | { | |
4710 | ecs->event_thread->control.stop_step = 1; | |
4711 | print_end_stepping_range_reason (); | |
4712 | stop_stepping (ecs); | |
4713 | } | |
4714 | else | |
4715 | keep_going (ecs); | |
4716 | ||
4717 | return; | |
4718 | } | |
4719 | ||
4720 | /* We stepped out of the stepping range. */ | |
4721 | ||
4722 | /* If we are stepping at the source level and entered the runtime | |
4723 | loader dynamic symbol resolution code... | |
4724 | ||
4725 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
4726 | time loader code and reach the callee's address. | |
4727 | ||
4728 | EXEC_REVERSE: we've already executed the callee (backward), and | |
4729 | the runtime loader code is handled just like any other | |
4730 | undebuggable function call. Now we need only keep stepping | |
4731 | backward through the trampoline code, and that's handled further | |
4732 | down, so there is nothing for us to do here. */ | |
4733 | ||
4734 | if (execution_direction != EXEC_REVERSE | |
4735 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
4736 | && in_solib_dynsym_resolve_code (stop_pc)) | |
4737 | { | |
4738 | CORE_ADDR pc_after_resolver = | |
4739 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); | |
4740 | ||
4741 | if (debug_infrun) | |
4742 | fprintf_unfiltered (gdb_stdlog, | |
4743 | "infrun: stepped into dynsym resolve code\n"); | |
4744 | ||
4745 | if (pc_after_resolver) | |
4746 | { | |
4747 | /* Set up a step-resume breakpoint at the address | |
4748 | indicated by SKIP_SOLIB_RESOLVER. */ | |
4749 | struct symtab_and_line sr_sal; | |
4750 | ||
4751 | init_sal (&sr_sal); | |
4752 | sr_sal.pc = pc_after_resolver; | |
4753 | sr_sal.pspace = get_frame_program_space (frame); | |
4754 | ||
4755 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4756 | sr_sal, null_frame_id); | |
4757 | } | |
4758 | ||
4759 | keep_going (ecs); | |
4760 | return; | |
4761 | } | |
4762 | ||
4763 | if (ecs->event_thread->control.step_range_end != 1 | |
4764 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
4765 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
4766 | && get_frame_type (frame) == SIGTRAMP_FRAME) | |
4767 | { | |
4768 | if (debug_infrun) | |
4769 | fprintf_unfiltered (gdb_stdlog, | |
4770 | "infrun: stepped into signal trampoline\n"); | |
4771 | /* The inferior, while doing a "step" or "next", has ended up in | |
4772 | a signal trampoline (either by a signal being delivered or by | |
4773 | the signal handler returning). Just single-step until the | |
4774 | inferior leaves the trampoline (either by calling the handler | |
4775 | or returning). */ | |
4776 | keep_going (ecs); | |
4777 | return; | |
4778 | } | |
4779 | ||
4780 | /* If we're in the return path from a shared library trampoline, | |
4781 | we want to proceed through the trampoline when stepping. */ | |
4782 | /* macro/2012-04-25: This needs to come before the subroutine | |
4783 | call check below as on some targets return trampolines look | |
4784 | like subroutine calls (MIPS16 return thunks). */ | |
4785 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
4786 | stop_pc, ecs->stop_func_name) | |
4787 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
4788 | { | |
4789 | /* Determine where this trampoline returns. */ | |
4790 | CORE_ADDR real_stop_pc; | |
4791 | ||
4792 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
4793 | ||
4794 | if (debug_infrun) | |
4795 | fprintf_unfiltered (gdb_stdlog, | |
4796 | "infrun: stepped into solib return tramp\n"); | |
4797 | ||
4798 | /* Only proceed through if we know where it's going. */ | |
4799 | if (real_stop_pc) | |
4800 | { | |
4801 | /* And put the step-breakpoint there and go until there. */ | |
4802 | struct symtab_and_line sr_sal; | |
4803 | ||
4804 | init_sal (&sr_sal); /* initialize to zeroes */ | |
4805 | sr_sal.pc = real_stop_pc; | |
4806 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
4807 | sr_sal.pspace = get_frame_program_space (frame); | |
4808 | ||
4809 | /* Do not specify what the fp should be when we stop since | |
4810 | on some machines the prologue is where the new fp value | |
4811 | is established. */ | |
4812 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4813 | sr_sal, null_frame_id); | |
4814 | ||
4815 | /* Restart without fiddling with the step ranges or | |
4816 | other state. */ | |
4817 | keep_going (ecs); | |
4818 | return; | |
4819 | } | |
4820 | } | |
4821 | ||
4822 | /* Check for subroutine calls. The check for the current frame | |
4823 | equalling the step ID is not necessary - the check of the | |
4824 | previous frame's ID is sufficient - but it is a common case and | |
4825 | cheaper than checking the previous frame's ID. | |
4826 | ||
4827 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
4828 | being equal, so to get into this block, both the current and | |
4829 | previous frame must have valid frame IDs. */ | |
4830 | /* The outer_frame_id check is a heuristic to detect stepping | |
4831 | through startup code. If we step over an instruction which | |
4832 | sets the stack pointer from an invalid value to a valid value, | |
4833 | we may detect that as a subroutine call from the mythical | |
4834 | "outermost" function. This could be fixed by marking | |
4835 | outermost frames as !stack_p,code_p,special_p. Then the | |
4836 | initial outermost frame, before sp was valid, would | |
4837 | have code_addr == &_start. See the comment in frame_id_eq | |
4838 | for more. */ | |
4839 | if (!frame_id_eq (get_stack_frame_id (frame), | |
4840 | ecs->event_thread->control.step_stack_frame_id) | |
4841 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), | |
4842 | ecs->event_thread->control.step_stack_frame_id) | |
4843 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
4844 | outer_frame_id) | |
4845 | || step_start_function != find_pc_function (stop_pc)))) | |
4846 | { | |
4847 | CORE_ADDR real_stop_pc; | |
4848 | ||
4849 | if (debug_infrun) | |
4850 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); | |
4851 | ||
4852 | if ((ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) | |
4853 | || ((ecs->event_thread->control.step_range_end == 1) | |
4854 | && in_prologue (gdbarch, ecs->event_thread->prev_pc, | |
4855 | ecs->stop_func_start))) | |
4856 | { | |
4857 | /* I presume that step_over_calls is only 0 when we're | |
4858 | supposed to be stepping at the assembly language level | |
4859 | ("stepi"). Just stop. */ | |
4860 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
4861 | thought it was a subroutine call but it was not. Stop as | |
4862 | well. FENN */ | |
4863 | /* And this works the same backward as frontward. MVS */ | |
4864 | ecs->event_thread->control.stop_step = 1; | |
4865 | print_end_stepping_range_reason (); | |
4866 | stop_stepping (ecs); | |
4867 | return; | |
4868 | } | |
4869 | ||
4870 | /* Reverse stepping through solib trampolines. */ | |
4871 | ||
4872 | if (execution_direction == EXEC_REVERSE | |
4873 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
4874 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
4875 | || (ecs->stop_func_start == 0 | |
4876 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
4877 | { | |
4878 | /* Any solib trampoline code can be handled in reverse | |
4879 | by simply continuing to single-step. We have already | |
4880 | executed the solib function (backwards), and a few | |
4881 | steps will take us back through the trampoline to the | |
4882 | caller. */ | |
4883 | keep_going (ecs); | |
4884 | return; | |
4885 | } | |
4886 | ||
4887 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
4888 | { | |
4889 | /* We're doing a "next". | |
4890 | ||
4891 | Normal (forward) execution: set a breakpoint at the | |
4892 | callee's return address (the address at which the caller | |
4893 | will resume). | |
4894 | ||
4895 | Reverse (backward) execution. set the step-resume | |
4896 | breakpoint at the start of the function that we just | |
4897 | stepped into (backwards), and continue to there. When we | |
4898 | get there, we'll need to single-step back to the caller. */ | |
4899 | ||
4900 | if (execution_direction == EXEC_REVERSE) | |
4901 | { | |
4902 | /* If we're already at the start of the function, we've either | |
4903 | just stepped backward into a single instruction function, | |
4904 | or stepped back out of a signal handler to the first instruction | |
4905 | of the function. Just keep going, which will single-step back | |
4906 | to the caller. */ | |
4907 | if (ecs->stop_func_start != stop_pc) | |
4908 | { | |
4909 | struct symtab_and_line sr_sal; | |
4910 | ||
4911 | /* Normal function call return (static or dynamic). */ | |
4912 | init_sal (&sr_sal); | |
4913 | sr_sal.pc = ecs->stop_func_start; | |
4914 | sr_sal.pspace = get_frame_program_space (frame); | |
4915 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4916 | sr_sal, null_frame_id); | |
4917 | } | |
4918 | } | |
4919 | else | |
4920 | insert_step_resume_breakpoint_at_caller (frame); | |
4921 | ||
4922 | keep_going (ecs); | |
4923 | return; | |
4924 | } | |
4925 | ||
4926 | /* If we are in a function call trampoline (a stub between the | |
4927 | calling routine and the real function), locate the real | |
4928 | function. That's what tells us (a) whether we want to step | |
4929 | into it at all, and (b) what prologue we want to run to the | |
4930 | end of, if we do step into it. */ | |
4931 | real_stop_pc = skip_language_trampoline (frame, stop_pc); | |
4932 | if (real_stop_pc == 0) | |
4933 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
4934 | if (real_stop_pc != 0) | |
4935 | ecs->stop_func_start = real_stop_pc; | |
4936 | ||
4937 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) | |
4938 | { | |
4939 | struct symtab_and_line sr_sal; | |
4940 | ||
4941 | init_sal (&sr_sal); | |
4942 | sr_sal.pc = ecs->stop_func_start; | |
4943 | sr_sal.pspace = get_frame_program_space (frame); | |
4944 | ||
4945 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4946 | sr_sal, null_frame_id); | |
4947 | keep_going (ecs); | |
4948 | return; | |
4949 | } | |
4950 | ||
4951 | /* If we have line number information for the function we are | |
4952 | thinking of stepping into and the function isn't on the skip | |
4953 | list, step into it. | |
4954 | ||
4955 | If there are several symtabs at that PC (e.g. with include | |
4956 | files), just want to know whether *any* of them have line | |
4957 | numbers. find_pc_line handles this. */ | |
4958 | { | |
4959 | struct symtab_and_line tmp_sal; | |
4960 | ||
4961 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); | |
4962 | if (tmp_sal.line != 0 | |
4963 | && !function_pc_is_marked_for_skip (ecs->stop_func_start)) | |
4964 | { | |
4965 | if (execution_direction == EXEC_REVERSE) | |
4966 | handle_step_into_function_backward (gdbarch, ecs); | |
4967 | else | |
4968 | handle_step_into_function (gdbarch, ecs); | |
4969 | return; | |
4970 | } | |
4971 | } | |
4972 | ||
4973 | /* If we have no line number and the step-stop-if-no-debug is | |
4974 | set, we stop the step so that the user has a chance to switch | |
4975 | in assembly mode. */ | |
4976 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
4977 | && step_stop_if_no_debug) | |
4978 | { | |
4979 | ecs->event_thread->control.stop_step = 1; | |
4980 | print_end_stepping_range_reason (); | |
4981 | stop_stepping (ecs); | |
4982 | return; | |
4983 | } | |
4984 | ||
4985 | if (execution_direction == EXEC_REVERSE) | |
4986 | { | |
4987 | /* If we're already at the start of the function, we've either just | |
4988 | stepped backward into a single instruction function without line | |
4989 | number info, or stepped back out of a signal handler to the first | |
4990 | instruction of the function without line number info. Just keep | |
4991 | going, which will single-step back to the caller. */ | |
4992 | if (ecs->stop_func_start != stop_pc) | |
4993 | { | |
4994 | /* Set a breakpoint at callee's start address. | |
4995 | From there we can step once and be back in the caller. */ | |
4996 | struct symtab_and_line sr_sal; | |
4997 | ||
4998 | init_sal (&sr_sal); | |
4999 | sr_sal.pc = ecs->stop_func_start; | |
5000 | sr_sal.pspace = get_frame_program_space (frame); | |
5001 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
5002 | sr_sal, null_frame_id); | |
5003 | } | |
5004 | } | |
5005 | else | |
5006 | /* Set a breakpoint at callee's return address (the address | |
5007 | at which the caller will resume). */ | |
5008 | insert_step_resume_breakpoint_at_caller (frame); | |
5009 | ||
5010 | keep_going (ecs); | |
5011 | return; | |
5012 | } | |
5013 | ||
5014 | /* Reverse stepping through solib trampolines. */ | |
5015 | ||
5016 | if (execution_direction == EXEC_REVERSE | |
5017 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
5018 | { | |
5019 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
5020 | || (ecs->stop_func_start == 0 | |
5021 | && in_solib_dynsym_resolve_code (stop_pc))) | |
5022 | { | |
5023 | /* Any solib trampoline code can be handled in reverse | |
5024 | by simply continuing to single-step. We have already | |
5025 | executed the solib function (backwards), and a few | |
5026 | steps will take us back through the trampoline to the | |
5027 | caller. */ | |
5028 | keep_going (ecs); | |
5029 | return; | |
5030 | } | |
5031 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
5032 | { | |
5033 | /* Stepped backward into the solib dynsym resolver. | |
5034 | Set a breakpoint at its start and continue, then | |
5035 | one more step will take us out. */ | |
5036 | struct symtab_and_line sr_sal; | |
5037 | ||
5038 | init_sal (&sr_sal); | |
5039 | sr_sal.pc = ecs->stop_func_start; | |
5040 | sr_sal.pspace = get_frame_program_space (frame); | |
5041 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
5042 | sr_sal, null_frame_id); | |
5043 | keep_going (ecs); | |
5044 | return; | |
5045 | } | |
5046 | } | |
5047 | ||
5048 | stop_pc_sal = find_pc_line (stop_pc, 0); | |
5049 | ||
5050 | /* NOTE: tausq/2004-05-24: This if block used to be done before all | |
5051 | the trampoline processing logic, however, there are some trampolines | |
5052 | that have no names, so we should do trampoline handling first. */ | |
5053 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
5054 | && ecs->stop_func_name == NULL | |
5055 | && stop_pc_sal.line == 0) | |
5056 | { | |
5057 | if (debug_infrun) | |
5058 | fprintf_unfiltered (gdb_stdlog, | |
5059 | "infrun: stepped into undebuggable function\n"); | |
5060 | ||
5061 | /* The inferior just stepped into, or returned to, an | |
5062 | undebuggable function (where there is no debugging information | |
5063 | and no line number corresponding to the address where the | |
5064 | inferior stopped). Since we want to skip this kind of code, | |
5065 | we keep going until the inferior returns from this | |
5066 | function - unless the user has asked us not to (via | |
5067 | set step-mode) or we no longer know how to get back | |
5068 | to the call site. */ | |
5069 | if (step_stop_if_no_debug | |
5070 | || !frame_id_p (frame_unwind_caller_id (frame))) | |
5071 | { | |
5072 | /* If we have no line number and the step-stop-if-no-debug | |
5073 | is set, we stop the step so that the user has a chance to | |
5074 | switch in assembly mode. */ | |
5075 | ecs->event_thread->control.stop_step = 1; | |
5076 | print_end_stepping_range_reason (); | |
5077 | stop_stepping (ecs); | |
5078 | return; | |
5079 | } | |
5080 | else | |
5081 | { | |
5082 | /* Set a breakpoint at callee's return address (the address | |
5083 | at which the caller will resume). */ | |
5084 | insert_step_resume_breakpoint_at_caller (frame); | |
5085 | keep_going (ecs); | |
5086 | return; | |
5087 | } | |
5088 | } | |
5089 | ||
5090 | if (ecs->event_thread->control.step_range_end == 1) | |
5091 | { | |
5092 | /* It is stepi or nexti. We always want to stop stepping after | |
5093 | one instruction. */ | |
5094 | if (debug_infrun) | |
5095 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); | |
5096 | ecs->event_thread->control.stop_step = 1; | |
5097 | print_end_stepping_range_reason (); | |
5098 | stop_stepping (ecs); | |
5099 | return; | |
5100 | } | |
5101 | ||
5102 | if (stop_pc_sal.line == 0) | |
5103 | { | |
5104 | /* We have no line number information. That means to stop | |
5105 | stepping (does this always happen right after one instruction, | |
5106 | when we do "s" in a function with no line numbers, | |
5107 | or can this happen as a result of a return or longjmp?). */ | |
5108 | if (debug_infrun) | |
5109 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); | |
5110 | ecs->event_thread->control.stop_step = 1; | |
5111 | print_end_stepping_range_reason (); | |
5112 | stop_stepping (ecs); | |
5113 | return; | |
5114 | } | |
5115 | ||
5116 | /* Look for "calls" to inlined functions, part one. If the inline | |
5117 | frame machinery detected some skipped call sites, we have entered | |
5118 | a new inline function. */ | |
5119 | ||
5120 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
5121 | ecs->event_thread->control.step_frame_id) | |
5122 | && inline_skipped_frames (ecs->ptid)) | |
5123 | { | |
5124 | struct symtab_and_line call_sal; | |
5125 | ||
5126 | if (debug_infrun) | |
5127 | fprintf_unfiltered (gdb_stdlog, | |
5128 | "infrun: stepped into inlined function\n"); | |
5129 | ||
5130 | find_frame_sal (get_current_frame (), &call_sal); | |
5131 | ||
5132 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) | |
5133 | { | |
5134 | /* For "step", we're going to stop. But if the call site | |
5135 | for this inlined function is on the same source line as | |
5136 | we were previously stepping, go down into the function | |
5137 | first. Otherwise stop at the call site. */ | |
5138 | ||
5139 | if (call_sal.line == ecs->event_thread->current_line | |
5140 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5141 | step_into_inline_frame (ecs->ptid); | |
5142 | ||
5143 | ecs->event_thread->control.stop_step = 1; | |
5144 | print_end_stepping_range_reason (); | |
5145 | stop_stepping (ecs); | |
5146 | return; | |
5147 | } | |
5148 | else | |
5149 | { | |
5150 | /* For "next", we should stop at the call site if it is on a | |
5151 | different source line. Otherwise continue through the | |
5152 | inlined function. */ | |
5153 | if (call_sal.line == ecs->event_thread->current_line | |
5154 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5155 | keep_going (ecs); | |
5156 | else | |
5157 | { | |
5158 | ecs->event_thread->control.stop_step = 1; | |
5159 | print_end_stepping_range_reason (); | |
5160 | stop_stepping (ecs); | |
5161 | } | |
5162 | return; | |
5163 | } | |
5164 | } | |
5165 | ||
5166 | /* Look for "calls" to inlined functions, part two. If we are still | |
5167 | in the same real function we were stepping through, but we have | |
5168 | to go further up to find the exact frame ID, we are stepping | |
5169 | through a more inlined call beyond its call site. */ | |
5170 | ||
5171 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
5172 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
5173 | ecs->event_thread->control.step_frame_id) | |
5174 | && stepped_in_from (get_current_frame (), | |
5175 | ecs->event_thread->control.step_frame_id)) | |
5176 | { | |
5177 | if (debug_infrun) | |
5178 | fprintf_unfiltered (gdb_stdlog, | |
5179 | "infrun: stepping through inlined function\n"); | |
5180 | ||
5181 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
5182 | keep_going (ecs); | |
5183 | else | |
5184 | { | |
5185 | ecs->event_thread->control.stop_step = 1; | |
5186 | print_end_stepping_range_reason (); | |
5187 | stop_stepping (ecs); | |
5188 | } | |
5189 | return; | |
5190 | } | |
5191 | ||
5192 | if ((stop_pc == stop_pc_sal.pc) | |
5193 | && (ecs->event_thread->current_line != stop_pc_sal.line | |
5194 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
5195 | { | |
5196 | /* We are at the start of a different line. So stop. Note that | |
5197 | we don't stop if we step into the middle of a different line. | |
5198 | That is said to make things like for (;;) statements work | |
5199 | better. */ | |
5200 | if (debug_infrun) | |
5201 | fprintf_unfiltered (gdb_stdlog, | |
5202 | "infrun: stepped to a different line\n"); | |
5203 | ecs->event_thread->control.stop_step = 1; | |
5204 | print_end_stepping_range_reason (); | |
5205 | stop_stepping (ecs); | |
5206 | return; | |
5207 | } | |
5208 | ||
5209 | /* We aren't done stepping. | |
5210 | ||
5211 | Optimize by setting the stepping range to the line. | |
5212 | (We might not be in the original line, but if we entered a | |
5213 | new line in mid-statement, we continue stepping. This makes | |
5214 | things like for(;;) statements work better.) */ | |
5215 | ||
5216 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; | |
5217 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
5218 | set_step_info (frame, stop_pc_sal); | |
5219 | ||
5220 | if (debug_infrun) | |
5221 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); | |
5222 | keep_going (ecs); | |
5223 | } | |
5224 | ||
5225 | /* Is thread TP in the middle of single-stepping? */ | |
5226 | ||
5227 | static int | |
5228 | currently_stepping (struct thread_info *tp) | |
5229 | { | |
5230 | return ((tp->control.step_range_end | |
5231 | && tp->control.step_resume_breakpoint == NULL) | |
5232 | || tp->control.trap_expected | |
5233 | || bpstat_should_step ()); | |
5234 | } | |
5235 | ||
5236 | /* Returns true if any thread *but* the one passed in "data" is in the | |
5237 | middle of stepping or of handling a "next". */ | |
5238 | ||
5239 | static int | |
5240 | currently_stepping_or_nexting_callback (struct thread_info *tp, void *data) | |
5241 | { | |
5242 | if (tp == data) | |
5243 | return 0; | |
5244 | ||
5245 | return (tp->control.step_range_end | |
5246 | || tp->control.trap_expected); | |
5247 | } | |
5248 | ||
5249 | /* Inferior has stepped into a subroutine call with source code that | |
5250 | we should not step over. Do step to the first line of code in | |
5251 | it. */ | |
5252 | ||
5253 | static void | |
5254 | handle_step_into_function (struct gdbarch *gdbarch, | |
5255 | struct execution_control_state *ecs) | |
5256 | { | |
5257 | struct symtab *s; | |
5258 | struct symtab_and_line stop_func_sal, sr_sal; | |
5259 | ||
5260 | fill_in_stop_func (gdbarch, ecs); | |
5261 | ||
5262 | s = find_pc_symtab (stop_pc); | |
5263 | if (s && s->language != language_asm) | |
5264 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, | |
5265 | ecs->stop_func_start); | |
5266 | ||
5267 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); | |
5268 | /* Use the step_resume_break to step until the end of the prologue, | |
5269 | even if that involves jumps (as it seems to on the vax under | |
5270 | 4.2). */ | |
5271 | /* If the prologue ends in the middle of a source line, continue to | |
5272 | the end of that source line (if it is still within the function). | |
5273 | Otherwise, just go to end of prologue. */ | |
5274 | if (stop_func_sal.end | |
5275 | && stop_func_sal.pc != ecs->stop_func_start | |
5276 | && stop_func_sal.end < ecs->stop_func_end) | |
5277 | ecs->stop_func_start = stop_func_sal.end; | |
5278 | ||
5279 | /* Architectures which require breakpoint adjustment might not be able | |
5280 | to place a breakpoint at the computed address. If so, the test | |
5281 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
5282 | ecs->stop_func_start to an address at which a breakpoint may be | |
5283 | legitimately placed. | |
5284 | ||
5285 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not | |
5286 | made, GDB will enter an infinite loop when stepping through | |
5287 | optimized code consisting of VLIW instructions which contain | |
5288 | subinstructions corresponding to different source lines. On | |
5289 | FR-V, it's not permitted to place a breakpoint on any but the | |
5290 | first subinstruction of a VLIW instruction. When a breakpoint is | |
5291 | set, GDB will adjust the breakpoint address to the beginning of | |
5292 | the VLIW instruction. Thus, we need to make the corresponding | |
5293 | adjustment here when computing the stop address. */ | |
5294 | ||
5295 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) | |
5296 | { | |
5297 | ecs->stop_func_start | |
5298 | = gdbarch_adjust_breakpoint_address (gdbarch, | |
5299 | ecs->stop_func_start); | |
5300 | } | |
5301 | ||
5302 | if (ecs->stop_func_start == stop_pc) | |
5303 | { | |
5304 | /* We are already there: stop now. */ | |
5305 | ecs->event_thread->control.stop_step = 1; | |
5306 | print_end_stepping_range_reason (); | |
5307 | stop_stepping (ecs); | |
5308 | return; | |
5309 | } | |
5310 | else | |
5311 | { | |
5312 | /* Put the step-breakpoint there and go until there. */ | |
5313 | init_sal (&sr_sal); /* initialize to zeroes */ | |
5314 | sr_sal.pc = ecs->stop_func_start; | |
5315 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
5316 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); | |
5317 | ||
5318 | /* Do not specify what the fp should be when we stop since on | |
5319 | some machines the prologue is where the new fp value is | |
5320 | established. */ | |
5321 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); | |
5322 | ||
5323 | /* And make sure stepping stops right away then. */ | |
5324 | ecs->event_thread->control.step_range_end | |
5325 | = ecs->event_thread->control.step_range_start; | |
5326 | } | |
5327 | keep_going (ecs); | |
5328 | } | |
5329 | ||
5330 | /* Inferior has stepped backward into a subroutine call with source | |
5331 | code that we should not step over. Do step to the beginning of the | |
5332 | last line of code in it. */ | |
5333 | ||
5334 | static void | |
5335 | handle_step_into_function_backward (struct gdbarch *gdbarch, | |
5336 | struct execution_control_state *ecs) | |
5337 | { | |
5338 | struct symtab *s; | |
5339 | struct symtab_and_line stop_func_sal; | |
5340 | ||
5341 | fill_in_stop_func (gdbarch, ecs); | |
5342 | ||
5343 | s = find_pc_symtab (stop_pc); | |
5344 | if (s && s->language != language_asm) | |
5345 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, | |
5346 | ecs->stop_func_start); | |
5347 | ||
5348 | stop_func_sal = find_pc_line (stop_pc, 0); | |
5349 | ||
5350 | /* OK, we're just going to keep stepping here. */ | |
5351 | if (stop_func_sal.pc == stop_pc) | |
5352 | { | |
5353 | /* We're there already. Just stop stepping now. */ | |
5354 | ecs->event_thread->control.stop_step = 1; | |
5355 | print_end_stepping_range_reason (); | |
5356 | stop_stepping (ecs); | |
5357 | } | |
5358 | else | |
5359 | { | |
5360 | /* Else just reset the step range and keep going. | |
5361 | No step-resume breakpoint, they don't work for | |
5362 | epilogues, which can have multiple entry paths. */ | |
5363 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; | |
5364 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
5365 | keep_going (ecs); | |
5366 | } | |
5367 | return; | |
5368 | } | |
5369 | ||
5370 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. | |
5371 | This is used to both functions and to skip over code. */ | |
5372 | ||
5373 | static void | |
5374 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, | |
5375 | struct symtab_and_line sr_sal, | |
5376 | struct frame_id sr_id, | |
5377 | enum bptype sr_type) | |
5378 | { | |
5379 | /* There should never be more than one step-resume or longjmp-resume | |
5380 | breakpoint per thread, so we should never be setting a new | |
5381 | step_resume_breakpoint when one is already active. */ | |
5382 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); | |
5383 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); | |
5384 | ||
5385 | if (debug_infrun) | |
5386 | fprintf_unfiltered (gdb_stdlog, | |
5387 | "infrun: inserting step-resume breakpoint at %s\n", | |
5388 | paddress (gdbarch, sr_sal.pc)); | |
5389 | ||
5390 | inferior_thread ()->control.step_resume_breakpoint | |
5391 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); | |
5392 | } | |
5393 | ||
5394 | void | |
5395 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, | |
5396 | struct symtab_and_line sr_sal, | |
5397 | struct frame_id sr_id) | |
5398 | { | |
5399 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
5400 | sr_sal, sr_id, | |
5401 | bp_step_resume); | |
5402 | } | |
5403 | ||
5404 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. | |
5405 | This is used to skip a potential signal handler. | |
5406 | ||
5407 | This is called with the interrupted function's frame. The signal | |
5408 | handler, when it returns, will resume the interrupted function at | |
5409 | RETURN_FRAME.pc. */ | |
5410 | ||
5411 | static void | |
5412 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) | |
5413 | { | |
5414 | struct symtab_and_line sr_sal; | |
5415 | struct gdbarch *gdbarch; | |
5416 | ||
5417 | gdb_assert (return_frame != NULL); | |
5418 | init_sal (&sr_sal); /* initialize to zeros */ | |
5419 | ||
5420 | gdbarch = get_frame_arch (return_frame); | |
5421 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); | |
5422 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
5423 | sr_sal.pspace = get_frame_program_space (return_frame); | |
5424 | ||
5425 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, | |
5426 | get_stack_frame_id (return_frame), | |
5427 | bp_hp_step_resume); | |
5428 | } | |
5429 | ||
5430 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This | |
5431 | is used to skip a function after stepping into it (for "next" or if | |
5432 | the called function has no debugging information). | |
5433 | ||
5434 | The current function has almost always been reached by single | |
5435 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
5436 | current function, and the breakpoint will be set at the caller's | |
5437 | resume address. | |
5438 | ||
5439 | This is a separate function rather than reusing | |
5440 | insert_hp_step_resume_breakpoint_at_frame in order to avoid | |
5441 | get_prev_frame, which may stop prematurely (see the implementation | |
5442 | of frame_unwind_caller_id for an example). */ | |
5443 | ||
5444 | static void | |
5445 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
5446 | { | |
5447 | struct symtab_and_line sr_sal; | |
5448 | struct gdbarch *gdbarch; | |
5449 | ||
5450 | /* We shouldn't have gotten here if we don't know where the call site | |
5451 | is. */ | |
5452 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); | |
5453 | ||
5454 | init_sal (&sr_sal); /* initialize to zeros */ | |
5455 | ||
5456 | gdbarch = frame_unwind_caller_arch (next_frame); | |
5457 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, | |
5458 | frame_unwind_caller_pc (next_frame)); | |
5459 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
5460 | sr_sal.pspace = frame_unwind_program_space (next_frame); | |
5461 | ||
5462 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, | |
5463 | frame_unwind_caller_id (next_frame)); | |
5464 | } | |
5465 | ||
5466 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a | |
5467 | new breakpoint at the target of a jmp_buf. The handling of | |
5468 | longjmp-resume uses the same mechanisms used for handling | |
5469 | "step-resume" breakpoints. */ | |
5470 | ||
5471 | static void | |
5472 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) | |
5473 | { | |
5474 | /* There should never be more than one longjmp-resume breakpoint per | |
5475 | thread, so we should never be setting a new | |
5476 | longjmp_resume_breakpoint when one is already active. */ | |
5477 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); | |
5478 | ||
5479 | if (debug_infrun) | |
5480 | fprintf_unfiltered (gdb_stdlog, | |
5481 | "infrun: inserting longjmp-resume breakpoint at %s\n", | |
5482 | paddress (gdbarch, pc)); | |
5483 | ||
5484 | inferior_thread ()->control.exception_resume_breakpoint = | |
5485 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); | |
5486 | } | |
5487 | ||
5488 | /* Insert an exception resume breakpoint. TP is the thread throwing | |
5489 | the exception. The block B is the block of the unwinder debug hook | |
5490 | function. FRAME is the frame corresponding to the call to this | |
5491 | function. SYM is the symbol of the function argument holding the | |
5492 | target PC of the exception. */ | |
5493 | ||
5494 | static void | |
5495 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
5496 | struct block *b, | |
5497 | struct frame_info *frame, | |
5498 | struct symbol *sym) | |
5499 | { | |
5500 | volatile struct gdb_exception e; | |
5501 | ||
5502 | /* We want to ignore errors here. */ | |
5503 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5504 | { | |
5505 | struct symbol *vsym; | |
5506 | struct value *value; | |
5507 | CORE_ADDR handler; | |
5508 | struct breakpoint *bp; | |
5509 | ||
5510 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); | |
5511 | value = read_var_value (vsym, frame); | |
5512 | /* If the value was optimized out, revert to the old behavior. */ | |
5513 | if (! value_optimized_out (value)) | |
5514 | { | |
5515 | handler = value_as_address (value); | |
5516 | ||
5517 | if (debug_infrun) | |
5518 | fprintf_unfiltered (gdb_stdlog, | |
5519 | "infrun: exception resume at %lx\n", | |
5520 | (unsigned long) handler); | |
5521 | ||
5522 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
5523 | handler, bp_exception_resume); | |
5524 | ||
5525 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
5526 | frame = NULL; | |
5527 | ||
5528 | bp->thread = tp->num; | |
5529 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
5530 | } | |
5531 | } | |
5532 | } | |
5533 | ||
5534 | /* A helper for check_exception_resume that sets an | |
5535 | exception-breakpoint based on a SystemTap probe. */ | |
5536 | ||
5537 | static void | |
5538 | insert_exception_resume_from_probe (struct thread_info *tp, | |
5539 | const struct probe *probe, | |
5540 | struct frame_info *frame) | |
5541 | { | |
5542 | struct value *arg_value; | |
5543 | CORE_ADDR handler; | |
5544 | struct breakpoint *bp; | |
5545 | ||
5546 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
5547 | if (!arg_value) | |
5548 | return; | |
5549 | ||
5550 | handler = value_as_address (arg_value); | |
5551 | ||
5552 | if (debug_infrun) | |
5553 | fprintf_unfiltered (gdb_stdlog, | |
5554 | "infrun: exception resume at %s\n", | |
5555 | paddress (get_objfile_arch (probe->objfile), | |
5556 | handler)); | |
5557 | ||
5558 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
5559 | handler, bp_exception_resume); | |
5560 | bp->thread = tp->num; | |
5561 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
5562 | } | |
5563 | ||
5564 | /* This is called when an exception has been intercepted. Check to | |
5565 | see whether the exception's destination is of interest, and if so, | |
5566 | set an exception resume breakpoint there. */ | |
5567 | ||
5568 | static void | |
5569 | check_exception_resume (struct execution_control_state *ecs, | |
5570 | struct frame_info *frame) | |
5571 | { | |
5572 | volatile struct gdb_exception e; | |
5573 | const struct probe *probe; | |
5574 | struct symbol *func; | |
5575 | ||
5576 | /* First see if this exception unwinding breakpoint was set via a | |
5577 | SystemTap probe point. If so, the probe has two arguments: the | |
5578 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
5579 | set a breakpoint there. */ | |
5580 | probe = find_probe_by_pc (get_frame_pc (frame)); | |
5581 | if (probe) | |
5582 | { | |
5583 | insert_exception_resume_from_probe (ecs->event_thread, probe, frame); | |
5584 | return; | |
5585 | } | |
5586 | ||
5587 | func = get_frame_function (frame); | |
5588 | if (!func) | |
5589 | return; | |
5590 | ||
5591 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5592 | { | |
5593 | struct block *b; | |
5594 | struct block_iterator iter; | |
5595 | struct symbol *sym; | |
5596 | int argno = 0; | |
5597 | ||
5598 | /* The exception breakpoint is a thread-specific breakpoint on | |
5599 | the unwinder's debug hook, declared as: | |
5600 | ||
5601 | void _Unwind_DebugHook (void *cfa, void *handler); | |
5602 | ||
5603 | The CFA argument indicates the frame to which control is | |
5604 | about to be transferred. HANDLER is the destination PC. | |
5605 | ||
5606 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
5607 | This is not extremely efficient but it avoids issues in gdb | |
5608 | with computing the DWARF CFA, and it also works even in weird | |
5609 | cases such as throwing an exception from inside a signal | |
5610 | handler. */ | |
5611 | ||
5612 | b = SYMBOL_BLOCK_VALUE (func); | |
5613 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
5614 | { | |
5615 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
5616 | continue; | |
5617 | ||
5618 | if (argno == 0) | |
5619 | ++argno; | |
5620 | else | |
5621 | { | |
5622 | insert_exception_resume_breakpoint (ecs->event_thread, | |
5623 | b, frame, sym); | |
5624 | break; | |
5625 | } | |
5626 | } | |
5627 | } | |
5628 | } | |
5629 | ||
5630 | static void | |
5631 | stop_stepping (struct execution_control_state *ecs) | |
5632 | { | |
5633 | if (debug_infrun) | |
5634 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); | |
5635 | ||
5636 | /* Let callers know we don't want to wait for the inferior anymore. */ | |
5637 | ecs->wait_some_more = 0; | |
5638 | } | |
5639 | ||
5640 | /* This function handles various cases where we need to continue | |
5641 | waiting for the inferior. */ | |
5642 | /* (Used to be the keep_going: label in the old wait_for_inferior). */ | |
5643 | ||
5644 | static void | |
5645 | keep_going (struct execution_control_state *ecs) | |
5646 | { | |
5647 | /* Make sure normal_stop is called if we get a QUIT handled before | |
5648 | reaching resume. */ | |
5649 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
5650 | ||
5651 | /* Save the pc before execution, to compare with pc after stop. */ | |
5652 | ecs->event_thread->prev_pc | |
5653 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
5654 | ||
5655 | /* If we did not do break;, it means we should keep running the | |
5656 | inferior and not return to debugger. */ | |
5657 | ||
5658 | if (ecs->event_thread->control.trap_expected | |
5659 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
5660 | { | |
5661 | /* We took a signal (which we are supposed to pass through to | |
5662 | the inferior, else we'd not get here) and we haven't yet | |
5663 | gotten our trap. Simply continue. */ | |
5664 | ||
5665 | discard_cleanups (old_cleanups); | |
5666 | resume (currently_stepping (ecs->event_thread), | |
5667 | ecs->event_thread->suspend.stop_signal); | |
5668 | } | |
5669 | else | |
5670 | { | |
5671 | /* Either the trap was not expected, but we are continuing | |
5672 | anyway (the user asked that this signal be passed to the | |
5673 | child) | |
5674 | -- or -- | |
5675 | The signal was SIGTRAP, e.g. it was our signal, but we | |
5676 | decided we should resume from it. | |
5677 | ||
5678 | We're going to run this baby now! | |
5679 | ||
5680 | Note that insert_breakpoints won't try to re-insert | |
5681 | already inserted breakpoints. Therefore, we don't | |
5682 | care if breakpoints were already inserted, or not. */ | |
5683 | ||
5684 | if (ecs->event_thread->stepping_over_breakpoint) | |
5685 | { | |
5686 | struct regcache *thread_regcache = get_thread_regcache (ecs->ptid); | |
5687 | ||
5688 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) | |
5689 | /* Since we can't do a displaced step, we have to remove | |
5690 | the breakpoint while we step it. To keep things | |
5691 | simple, we remove them all. */ | |
5692 | remove_breakpoints (); | |
5693 | } | |
5694 | else | |
5695 | { | |
5696 | volatile struct gdb_exception e; | |
5697 | ||
5698 | /* Stop stepping when inserting breakpoints | |
5699 | has failed. */ | |
5700 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5701 | { | |
5702 | insert_breakpoints (); | |
5703 | } | |
5704 | if (e.reason < 0) | |
5705 | { | |
5706 | exception_print (gdb_stderr, e); | |
5707 | stop_stepping (ecs); | |
5708 | return; | |
5709 | } | |
5710 | } | |
5711 | ||
5712 | ecs->event_thread->control.trap_expected | |
5713 | = ecs->event_thread->stepping_over_breakpoint; | |
5714 | ||
5715 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
5716 | specifies that such a signal should be delivered to the | |
5717 | target program). | |
5718 | ||
5719 | Typically, this would occure when a user is debugging a | |
5720 | target monitor on a simulator: the target monitor sets a | |
5721 | breakpoint; the simulator encounters this break-point and | |
5722 | halts the simulation handing control to GDB; GDB, noteing | |
5723 | that the break-point isn't valid, returns control back to the | |
5724 | simulator; the simulator then delivers the hardware | |
5725 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
5726 | ||
5727 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5728 | && !signal_program[ecs->event_thread->suspend.stop_signal]) | |
5729 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
5730 | ||
5731 | discard_cleanups (old_cleanups); | |
5732 | resume (currently_stepping (ecs->event_thread), | |
5733 | ecs->event_thread->suspend.stop_signal); | |
5734 | } | |
5735 | ||
5736 | prepare_to_wait (ecs); | |
5737 | } | |
5738 | ||
5739 | /* This function normally comes after a resume, before | |
5740 | handle_inferior_event exits. It takes care of any last bits of | |
5741 | housekeeping, and sets the all-important wait_some_more flag. */ | |
5742 | ||
5743 | static void | |
5744 | prepare_to_wait (struct execution_control_state *ecs) | |
5745 | { | |
5746 | if (debug_infrun) | |
5747 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); | |
5748 | ||
5749 | /* This is the old end of the while loop. Let everybody know we | |
5750 | want to wait for the inferior some more and get called again | |
5751 | soon. */ | |
5752 | ecs->wait_some_more = 1; | |
5753 | } | |
5754 | ||
5755 | /* Several print_*_reason functions to print why the inferior has stopped. | |
5756 | We always print something when the inferior exits, or receives a signal. | |
5757 | The rest of the cases are dealt with later on in normal_stop and | |
5758 | print_it_typical. Ideally there should be a call to one of these | |
5759 | print_*_reason functions functions from handle_inferior_event each time | |
5760 | stop_stepping is called. */ | |
5761 | ||
5762 | /* Print why the inferior has stopped. | |
5763 | We are done with a step/next/si/ni command, print why the inferior has | |
5764 | stopped. For now print nothing. Print a message only if not in the middle | |
5765 | of doing a "step n" operation for n > 1. */ | |
5766 | ||
5767 | static void | |
5768 | print_end_stepping_range_reason (void) | |
5769 | { | |
5770 | if ((!inferior_thread ()->step_multi | |
5771 | || !inferior_thread ()->control.stop_step) | |
5772 | && ui_out_is_mi_like_p (current_uiout)) | |
5773 | ui_out_field_string (current_uiout, "reason", | |
5774 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
5775 | } | |
5776 | ||
5777 | /* The inferior was terminated by a signal, print why it stopped. */ | |
5778 | ||
5779 | static void | |
5780 | print_signal_exited_reason (enum gdb_signal siggnal) | |
5781 | { | |
5782 | struct ui_out *uiout = current_uiout; | |
5783 | ||
5784 | annotate_signalled (); | |
5785 | if (ui_out_is_mi_like_p (uiout)) | |
5786 | ui_out_field_string | |
5787 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
5788 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
5789 | annotate_signal_name (); | |
5790 | ui_out_field_string (uiout, "signal-name", | |
5791 | gdb_signal_to_name (siggnal)); | |
5792 | annotate_signal_name_end (); | |
5793 | ui_out_text (uiout, ", "); | |
5794 | annotate_signal_string (); | |
5795 | ui_out_field_string (uiout, "signal-meaning", | |
5796 | gdb_signal_to_string (siggnal)); | |
5797 | annotate_signal_string_end (); | |
5798 | ui_out_text (uiout, ".\n"); | |
5799 | ui_out_text (uiout, "The program no longer exists.\n"); | |
5800 | } | |
5801 | ||
5802 | /* The inferior program is finished, print why it stopped. */ | |
5803 | ||
5804 | static void | |
5805 | print_exited_reason (int exitstatus) | |
5806 | { | |
5807 | struct inferior *inf = current_inferior (); | |
5808 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
5809 | struct ui_out *uiout = current_uiout; | |
5810 | ||
5811 | annotate_exited (exitstatus); | |
5812 | if (exitstatus) | |
5813 | { | |
5814 | if (ui_out_is_mi_like_p (uiout)) | |
5815 | ui_out_field_string (uiout, "reason", | |
5816 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
5817 | ui_out_text (uiout, "[Inferior "); | |
5818 | ui_out_text (uiout, plongest (inf->num)); | |
5819 | ui_out_text (uiout, " ("); | |
5820 | ui_out_text (uiout, pidstr); | |
5821 | ui_out_text (uiout, ") exited with code "); | |
5822 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); | |
5823 | ui_out_text (uiout, "]\n"); | |
5824 | } | |
5825 | else | |
5826 | { | |
5827 | if (ui_out_is_mi_like_p (uiout)) | |
5828 | ui_out_field_string | |
5829 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
5830 | ui_out_text (uiout, "[Inferior "); | |
5831 | ui_out_text (uiout, plongest (inf->num)); | |
5832 | ui_out_text (uiout, " ("); | |
5833 | ui_out_text (uiout, pidstr); | |
5834 | ui_out_text (uiout, ") exited normally]\n"); | |
5835 | } | |
5836 | /* Support the --return-child-result option. */ | |
5837 | return_child_result_value = exitstatus; | |
5838 | } | |
5839 | ||
5840 | /* Signal received, print why the inferior has stopped. The signal table | |
5841 | tells us to print about it. */ | |
5842 | ||
5843 | static void | |
5844 | print_signal_received_reason (enum gdb_signal siggnal) | |
5845 | { | |
5846 | struct ui_out *uiout = current_uiout; | |
5847 | ||
5848 | annotate_signal (); | |
5849 | ||
5850 | if (siggnal == GDB_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) | |
5851 | { | |
5852 | struct thread_info *t = inferior_thread (); | |
5853 | ||
5854 | ui_out_text (uiout, "\n["); | |
5855 | ui_out_field_string (uiout, "thread-name", | |
5856 | target_pid_to_str (t->ptid)); | |
5857 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
5858 | ui_out_text (uiout, " stopped"); | |
5859 | } | |
5860 | else | |
5861 | { | |
5862 | ui_out_text (uiout, "\nProgram received signal "); | |
5863 | annotate_signal_name (); | |
5864 | if (ui_out_is_mi_like_p (uiout)) | |
5865 | ui_out_field_string | |
5866 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
5867 | ui_out_field_string (uiout, "signal-name", | |
5868 | gdb_signal_to_name (siggnal)); | |
5869 | annotate_signal_name_end (); | |
5870 | ui_out_text (uiout, ", "); | |
5871 | annotate_signal_string (); | |
5872 | ui_out_field_string (uiout, "signal-meaning", | |
5873 | gdb_signal_to_string (siggnal)); | |
5874 | annotate_signal_string_end (); | |
5875 | } | |
5876 | ui_out_text (uiout, ".\n"); | |
5877 | } | |
5878 | ||
5879 | /* Reverse execution: target ran out of history info, print why the inferior | |
5880 | has stopped. */ | |
5881 | ||
5882 | static void | |
5883 | print_no_history_reason (void) | |
5884 | { | |
5885 | ui_out_text (current_uiout, "\nNo more reverse-execution history.\n"); | |
5886 | } | |
5887 | ||
5888 | /* Here to return control to GDB when the inferior stops for real. | |
5889 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
5890 | ||
5891 | STOP_PRINT_FRAME nonzero means print the executing frame | |
5892 | (pc, function, args, file, line number and line text). | |
5893 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
5894 | attempting to insert breakpoints. */ | |
5895 | ||
5896 | void | |
5897 | normal_stop (void) | |
5898 | { | |
5899 | struct target_waitstatus last; | |
5900 | ptid_t last_ptid; | |
5901 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); | |
5902 | ||
5903 | get_last_target_status (&last_ptid, &last); | |
5904 | ||
5905 | /* If an exception is thrown from this point on, make sure to | |
5906 | propagate GDB's knowledge of the executing state to the | |
5907 | frontend/user running state. A QUIT is an easy exception to see | |
5908 | here, so do this before any filtered output. */ | |
5909 | if (!non_stop) | |
5910 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
5911 | else if (last.kind != TARGET_WAITKIND_SIGNALLED | |
5912 | && last.kind != TARGET_WAITKIND_EXITED | |
5913 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5914 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); | |
5915 | ||
5916 | /* In non-stop mode, we don't want GDB to switch threads behind the | |
5917 | user's back, to avoid races where the user is typing a command to | |
5918 | apply to thread x, but GDB switches to thread y before the user | |
5919 | finishes entering the command. */ | |
5920 | ||
5921 | /* As with the notification of thread events, we want to delay | |
5922 | notifying the user that we've switched thread context until | |
5923 | the inferior actually stops. | |
5924 | ||
5925 | There's no point in saying anything if the inferior has exited. | |
5926 | Note that SIGNALLED here means "exited with a signal", not | |
5927 | "received a signal". */ | |
5928 | if (!non_stop | |
5929 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
5930 | && target_has_execution | |
5931 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
5932 | && last.kind != TARGET_WAITKIND_EXITED | |
5933 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5934 | { | |
5935 | target_terminal_ours_for_output (); | |
5936 | printf_filtered (_("[Switching to %s]\n"), | |
5937 | target_pid_to_str (inferior_ptid)); | |
5938 | annotate_thread_changed (); | |
5939 | previous_inferior_ptid = inferior_ptid; | |
5940 | } | |
5941 | ||
5942 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) | |
5943 | { | |
5944 | gdb_assert (sync_execution || !target_can_async_p ()); | |
5945 | ||
5946 | target_terminal_ours_for_output (); | |
5947 | printf_filtered (_("No unwaited-for children left.\n")); | |
5948 | } | |
5949 | ||
5950 | if (!breakpoints_always_inserted_mode () && target_has_execution) | |
5951 | { | |
5952 | if (remove_breakpoints ()) | |
5953 | { | |
5954 | target_terminal_ours_for_output (); | |
5955 | printf_filtered (_("Cannot remove breakpoints because " | |
5956 | "program is no longer writable.\nFurther " | |
5957 | "execution is probably impossible.\n")); | |
5958 | } | |
5959 | } | |
5960 | ||
5961 | /* If an auto-display called a function and that got a signal, | |
5962 | delete that auto-display to avoid an infinite recursion. */ | |
5963 | ||
5964 | if (stopped_by_random_signal) | |
5965 | disable_current_display (); | |
5966 | ||
5967 | /* Don't print a message if in the middle of doing a "step n" | |
5968 | operation for n > 1 */ | |
5969 | if (target_has_execution | |
5970 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
5971 | && last.kind != TARGET_WAITKIND_EXITED | |
5972 | && inferior_thread ()->step_multi | |
5973 | && inferior_thread ()->control.stop_step) | |
5974 | goto done; | |
5975 | ||
5976 | target_terminal_ours (); | |
5977 | async_enable_stdin (); | |
5978 | ||
5979 | /* Set the current source location. This will also happen if we | |
5980 | display the frame below, but the current SAL will be incorrect | |
5981 | during a user hook-stop function. */ | |
5982 | if (has_stack_frames () && !stop_stack_dummy) | |
5983 | set_current_sal_from_frame (get_current_frame (), 1); | |
5984 | ||
5985 | /* Let the user/frontend see the threads as stopped. */ | |
5986 | do_cleanups (old_chain); | |
5987 | ||
5988 | /* Look up the hook_stop and run it (CLI internally handles problem | |
5989 | of stop_command's pre-hook not existing). */ | |
5990 | if (stop_command) | |
5991 | catch_errors (hook_stop_stub, stop_command, | |
5992 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
5993 | ||
5994 | if (!has_stack_frames ()) | |
5995 | goto done; | |
5996 | ||
5997 | if (last.kind == TARGET_WAITKIND_SIGNALLED | |
5998 | || last.kind == TARGET_WAITKIND_EXITED) | |
5999 | goto done; | |
6000 | ||
6001 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
6002 | and current location is based on that. | |
6003 | Don't do this on return from a stack dummy routine, | |
6004 | or if the program has exited. */ | |
6005 | ||
6006 | if (!stop_stack_dummy) | |
6007 | { | |
6008 | select_frame (get_current_frame ()); | |
6009 | ||
6010 | /* Print current location without a level number, if | |
6011 | we have changed functions or hit a breakpoint. | |
6012 | Print source line if we have one. | |
6013 | bpstat_print() contains the logic deciding in detail | |
6014 | what to print, based on the event(s) that just occurred. */ | |
6015 | ||
6016 | /* If --batch-silent is enabled then there's no need to print the current | |
6017 | source location, and to try risks causing an error message about | |
6018 | missing source files. */ | |
6019 | if (stop_print_frame && !batch_silent) | |
6020 | { | |
6021 | int bpstat_ret; | |
6022 | int source_flag; | |
6023 | int do_frame_printing = 1; | |
6024 | struct thread_info *tp = inferior_thread (); | |
6025 | ||
6026 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, last.kind); | |
6027 | switch (bpstat_ret) | |
6028 | { | |
6029 | case PRINT_UNKNOWN: | |
6030 | /* FIXME: cagney/2002-12-01: Given that a frame ID does | |
6031 | (or should) carry around the function and does (or | |
6032 | should) use that when doing a frame comparison. */ | |
6033 | if (tp->control.stop_step | |
6034 | && frame_id_eq (tp->control.step_frame_id, | |
6035 | get_frame_id (get_current_frame ())) | |
6036 | && step_start_function == find_pc_function (stop_pc)) | |
6037 | source_flag = SRC_LINE; /* Finished step, just | |
6038 | print source line. */ | |
6039 | else | |
6040 | source_flag = SRC_AND_LOC; /* Print location and | |
6041 | source line. */ | |
6042 | break; | |
6043 | case PRINT_SRC_AND_LOC: | |
6044 | source_flag = SRC_AND_LOC; /* Print location and | |
6045 | source line. */ | |
6046 | break; | |
6047 | case PRINT_SRC_ONLY: | |
6048 | source_flag = SRC_LINE; | |
6049 | break; | |
6050 | case PRINT_NOTHING: | |
6051 | source_flag = SRC_LINE; /* something bogus */ | |
6052 | do_frame_printing = 0; | |
6053 | break; | |
6054 | default: | |
6055 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
6056 | } | |
6057 | ||
6058 | /* The behavior of this routine with respect to the source | |
6059 | flag is: | |
6060 | SRC_LINE: Print only source line | |
6061 | LOCATION: Print only location | |
6062 | SRC_AND_LOC: Print location and source line. */ | |
6063 | if (do_frame_printing) | |
6064 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); | |
6065 | ||
6066 | /* Display the auto-display expressions. */ | |
6067 | do_displays (); | |
6068 | } | |
6069 | } | |
6070 | ||
6071 | /* Save the function value return registers, if we care. | |
6072 | We might be about to restore their previous contents. */ | |
6073 | if (inferior_thread ()->control.proceed_to_finish | |
6074 | && execution_direction != EXEC_REVERSE) | |
6075 | { | |
6076 | /* This should not be necessary. */ | |
6077 | if (stop_registers) | |
6078 | regcache_xfree (stop_registers); | |
6079 | ||
6080 | /* NB: The copy goes through to the target picking up the value of | |
6081 | all the registers. */ | |
6082 | stop_registers = regcache_dup (get_current_regcache ()); | |
6083 | } | |
6084 | ||
6085 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
6086 | { | |
6087 | /* Pop the empty frame that contains the stack dummy. | |
6088 | This also restores inferior state prior to the call | |
6089 | (struct infcall_suspend_state). */ | |
6090 | struct frame_info *frame = get_current_frame (); | |
6091 | ||
6092 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
6093 | frame_pop (frame); | |
6094 | /* frame_pop() calls reinit_frame_cache as the last thing it | |
6095 | does which means there's currently no selected frame. We | |
6096 | don't need to re-establish a selected frame if the dummy call | |
6097 | returns normally, that will be done by | |
6098 | restore_infcall_control_state. However, we do have to handle | |
6099 | the case where the dummy call is returning after being | |
6100 | stopped (e.g. the dummy call previously hit a breakpoint). | |
6101 | We can't know which case we have so just always re-establish | |
6102 | a selected frame here. */ | |
6103 | select_frame (get_current_frame ()); | |
6104 | } | |
6105 | ||
6106 | done: | |
6107 | annotate_stopped (); | |
6108 | ||
6109 | /* Suppress the stop observer if we're in the middle of: | |
6110 | ||
6111 | - a step n (n > 1), as there still more steps to be done. | |
6112 | ||
6113 | - a "finish" command, as the observer will be called in | |
6114 | finish_command_continuation, so it can include the inferior | |
6115 | function's return value. | |
6116 | ||
6117 | - calling an inferior function, as we pretend we inferior didn't | |
6118 | run at all. The return value of the call is handled by the | |
6119 | expression evaluator, through call_function_by_hand. */ | |
6120 | ||
6121 | if (!target_has_execution | |
6122 | || last.kind == TARGET_WAITKIND_SIGNALLED | |
6123 | || last.kind == TARGET_WAITKIND_EXITED | |
6124 | || last.kind == TARGET_WAITKIND_NO_RESUMED | |
6125 | || (!(inferior_thread ()->step_multi | |
6126 | && inferior_thread ()->control.stop_step) | |
6127 | && !(inferior_thread ()->control.stop_bpstat | |
6128 | && inferior_thread ()->control.proceed_to_finish) | |
6129 | && !inferior_thread ()->control.in_infcall)) | |
6130 | { | |
6131 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
6132 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, | |
6133 | stop_print_frame); | |
6134 | else | |
6135 | observer_notify_normal_stop (NULL, stop_print_frame); | |
6136 | } | |
6137 | ||
6138 | if (target_has_execution) | |
6139 | { | |
6140 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
6141 | && last.kind != TARGET_WAITKIND_EXITED) | |
6142 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
6143 | Delete any breakpoint that is to be deleted at the next stop. */ | |
6144 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); | |
6145 | } | |
6146 | ||
6147 | /* Try to get rid of automatically added inferiors that are no | |
6148 | longer needed. Keeping those around slows down things linearly. | |
6149 | Note that this never removes the current inferior. */ | |
6150 | prune_inferiors (); | |
6151 | } | |
6152 | ||
6153 | static int | |
6154 | hook_stop_stub (void *cmd) | |
6155 | { | |
6156 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); | |
6157 | return (0); | |
6158 | } | |
6159 | \f | |
6160 | int | |
6161 | signal_stop_state (int signo) | |
6162 | { | |
6163 | return signal_stop[signo]; | |
6164 | } | |
6165 | ||
6166 | int | |
6167 | signal_print_state (int signo) | |
6168 | { | |
6169 | return signal_print[signo]; | |
6170 | } | |
6171 | ||
6172 | int | |
6173 | signal_pass_state (int signo) | |
6174 | { | |
6175 | return signal_program[signo]; | |
6176 | } | |
6177 | ||
6178 | static void | |
6179 | signal_cache_update (int signo) | |
6180 | { | |
6181 | if (signo == -1) | |
6182 | { | |
6183 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) | |
6184 | signal_cache_update (signo); | |
6185 | ||
6186 | return; | |
6187 | } | |
6188 | ||
6189 | signal_pass[signo] = (signal_stop[signo] == 0 | |
6190 | && signal_print[signo] == 0 | |
6191 | && signal_program[signo] == 1); | |
6192 | } | |
6193 | ||
6194 | int | |
6195 | signal_stop_update (int signo, int state) | |
6196 | { | |
6197 | int ret = signal_stop[signo]; | |
6198 | ||
6199 | signal_stop[signo] = state; | |
6200 | signal_cache_update (signo); | |
6201 | return ret; | |
6202 | } | |
6203 | ||
6204 | int | |
6205 | signal_print_update (int signo, int state) | |
6206 | { | |
6207 | int ret = signal_print[signo]; | |
6208 | ||
6209 | signal_print[signo] = state; | |
6210 | signal_cache_update (signo); | |
6211 | return ret; | |
6212 | } | |
6213 | ||
6214 | int | |
6215 | signal_pass_update (int signo, int state) | |
6216 | { | |
6217 | int ret = signal_program[signo]; | |
6218 | ||
6219 | signal_program[signo] = state; | |
6220 | signal_cache_update (signo); | |
6221 | return ret; | |
6222 | } | |
6223 | ||
6224 | static void | |
6225 | sig_print_header (void) | |
6226 | { | |
6227 | printf_filtered (_("Signal Stop\tPrint\tPass " | |
6228 | "to program\tDescription\n")); | |
6229 | } | |
6230 | ||
6231 | static void | |
6232 | sig_print_info (enum gdb_signal oursig) | |
6233 | { | |
6234 | const char *name = gdb_signal_to_name (oursig); | |
6235 | int name_padding = 13 - strlen (name); | |
6236 | ||
6237 | if (name_padding <= 0) | |
6238 | name_padding = 0; | |
6239 | ||
6240 | printf_filtered ("%s", name); | |
6241 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); | |
6242 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
6243 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
6244 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
6245 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); | |
6246 | } | |
6247 | ||
6248 | /* Specify how various signals in the inferior should be handled. */ | |
6249 | ||
6250 | static void | |
6251 | handle_command (char *args, int from_tty) | |
6252 | { | |
6253 | char **argv; | |
6254 | int digits, wordlen; | |
6255 | int sigfirst, signum, siglast; | |
6256 | enum gdb_signal oursig; | |
6257 | int allsigs; | |
6258 | int nsigs; | |
6259 | unsigned char *sigs; | |
6260 | struct cleanup *old_chain; | |
6261 | ||
6262 | if (args == NULL) | |
6263 | { | |
6264 | error_no_arg (_("signal to handle")); | |
6265 | } | |
6266 | ||
6267 | /* Allocate and zero an array of flags for which signals to handle. */ | |
6268 | ||
6269 | nsigs = (int) GDB_SIGNAL_LAST; | |
6270 | sigs = (unsigned char *) alloca (nsigs); | |
6271 | memset (sigs, 0, nsigs); | |
6272 | ||
6273 | /* Break the command line up into args. */ | |
6274 | ||
6275 | argv = gdb_buildargv (args); | |
6276 | old_chain = make_cleanup_freeargv (argv); | |
6277 | ||
6278 | /* Walk through the args, looking for signal oursigs, signal names, and | |
6279 | actions. Signal numbers and signal names may be interspersed with | |
6280 | actions, with the actions being performed for all signals cumulatively | |
6281 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
6282 | ||
6283 | while (*argv != NULL) | |
6284 | { | |
6285 | wordlen = strlen (*argv); | |
6286 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
6287 | {; | |
6288 | } | |
6289 | allsigs = 0; | |
6290 | sigfirst = siglast = -1; | |
6291 | ||
6292 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
6293 | { | |
6294 | /* Apply action to all signals except those used by the | |
6295 | debugger. Silently skip those. */ | |
6296 | allsigs = 1; | |
6297 | sigfirst = 0; | |
6298 | siglast = nsigs - 1; | |
6299 | } | |
6300 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
6301 | { | |
6302 | SET_SIGS (nsigs, sigs, signal_stop); | |
6303 | SET_SIGS (nsigs, sigs, signal_print); | |
6304 | } | |
6305 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
6306 | { | |
6307 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6308 | } | |
6309 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
6310 | { | |
6311 | SET_SIGS (nsigs, sigs, signal_print); | |
6312 | } | |
6313 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
6314 | { | |
6315 | SET_SIGS (nsigs, sigs, signal_program); | |
6316 | } | |
6317 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
6318 | { | |
6319 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6320 | } | |
6321 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
6322 | { | |
6323 | SET_SIGS (nsigs, sigs, signal_program); | |
6324 | } | |
6325 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
6326 | { | |
6327 | UNSET_SIGS (nsigs, sigs, signal_print); | |
6328 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6329 | } | |
6330 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
6331 | { | |
6332 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6333 | } | |
6334 | else if (digits > 0) | |
6335 | { | |
6336 | /* It is numeric. The numeric signal refers to our own | |
6337 | internal signal numbering from target.h, not to host/target | |
6338 | signal number. This is a feature; users really should be | |
6339 | using symbolic names anyway, and the common ones like | |
6340 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
6341 | ||
6342 | sigfirst = siglast = (int) | |
6343 | gdb_signal_from_command (atoi (*argv)); | |
6344 | if ((*argv)[digits] == '-') | |
6345 | { | |
6346 | siglast = (int) | |
6347 | gdb_signal_from_command (atoi ((*argv) + digits + 1)); | |
6348 | } | |
6349 | if (sigfirst > siglast) | |
6350 | { | |
6351 | /* Bet he didn't figure we'd think of this case... */ | |
6352 | signum = sigfirst; | |
6353 | sigfirst = siglast; | |
6354 | siglast = signum; | |
6355 | } | |
6356 | } | |
6357 | else | |
6358 | { | |
6359 | oursig = gdb_signal_from_name (*argv); | |
6360 | if (oursig != GDB_SIGNAL_UNKNOWN) | |
6361 | { | |
6362 | sigfirst = siglast = (int) oursig; | |
6363 | } | |
6364 | else | |
6365 | { | |
6366 | /* Not a number and not a recognized flag word => complain. */ | |
6367 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); | |
6368 | } | |
6369 | } | |
6370 | ||
6371 | /* If any signal numbers or symbol names were found, set flags for | |
6372 | which signals to apply actions to. */ | |
6373 | ||
6374 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
6375 | { | |
6376 | switch ((enum gdb_signal) signum) | |
6377 | { | |
6378 | case GDB_SIGNAL_TRAP: | |
6379 | case GDB_SIGNAL_INT: | |
6380 | if (!allsigs && !sigs[signum]) | |
6381 | { | |
6382 | if (query (_("%s is used by the debugger.\n\ | |
6383 | Are you sure you want to change it? "), | |
6384 | gdb_signal_to_name ((enum gdb_signal) signum))) | |
6385 | { | |
6386 | sigs[signum] = 1; | |
6387 | } | |
6388 | else | |
6389 | { | |
6390 | printf_unfiltered (_("Not confirmed, unchanged.\n")); | |
6391 | gdb_flush (gdb_stdout); | |
6392 | } | |
6393 | } | |
6394 | break; | |
6395 | case GDB_SIGNAL_0: | |
6396 | case GDB_SIGNAL_DEFAULT: | |
6397 | case GDB_SIGNAL_UNKNOWN: | |
6398 | /* Make sure that "all" doesn't print these. */ | |
6399 | break; | |
6400 | default: | |
6401 | sigs[signum] = 1; | |
6402 | break; | |
6403 | } | |
6404 | } | |
6405 | ||
6406 | argv++; | |
6407 | } | |
6408 | ||
6409 | for (signum = 0; signum < nsigs; signum++) | |
6410 | if (sigs[signum]) | |
6411 | { | |
6412 | signal_cache_update (-1); | |
6413 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
6414 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
6415 | ||
6416 | if (from_tty) | |
6417 | { | |
6418 | /* Show the results. */ | |
6419 | sig_print_header (); | |
6420 | for (; signum < nsigs; signum++) | |
6421 | if (sigs[signum]) | |
6422 | sig_print_info (signum); | |
6423 | } | |
6424 | ||
6425 | break; | |
6426 | } | |
6427 | ||
6428 | do_cleanups (old_chain); | |
6429 | } | |
6430 | ||
6431 | /* Complete the "handle" command. */ | |
6432 | ||
6433 | static VEC (char_ptr) * | |
6434 | handle_completer (struct cmd_list_element *ignore, | |
6435 | char *text, char *word) | |
6436 | { | |
6437 | VEC (char_ptr) *vec_signals, *vec_keywords, *return_val; | |
6438 | static const char * const keywords[] = | |
6439 | { | |
6440 | "all", | |
6441 | "stop", | |
6442 | "ignore", | |
6443 | "print", | |
6444 | "pass", | |
6445 | "nostop", | |
6446 | "noignore", | |
6447 | "noprint", | |
6448 | "nopass", | |
6449 | NULL, | |
6450 | }; | |
6451 | ||
6452 | vec_signals = signal_completer (ignore, text, word); | |
6453 | vec_keywords = complete_on_enum (keywords, word, word); | |
6454 | ||
6455 | return_val = VEC_merge (char_ptr, vec_signals, vec_keywords); | |
6456 | VEC_free (char_ptr, vec_signals); | |
6457 | VEC_free (char_ptr, vec_keywords); | |
6458 | return return_val; | |
6459 | } | |
6460 | ||
6461 | static void | |
6462 | xdb_handle_command (char *args, int from_tty) | |
6463 | { | |
6464 | char **argv; | |
6465 | struct cleanup *old_chain; | |
6466 | ||
6467 | if (args == NULL) | |
6468 | error_no_arg (_("xdb command")); | |
6469 | ||
6470 | /* Break the command line up into args. */ | |
6471 | ||
6472 | argv = gdb_buildargv (args); | |
6473 | old_chain = make_cleanup_freeargv (argv); | |
6474 | if (argv[1] != (char *) NULL) | |
6475 | { | |
6476 | char *argBuf; | |
6477 | int bufLen; | |
6478 | ||
6479 | bufLen = strlen (argv[0]) + 20; | |
6480 | argBuf = (char *) xmalloc (bufLen); | |
6481 | if (argBuf) | |
6482 | { | |
6483 | int validFlag = 1; | |
6484 | enum gdb_signal oursig; | |
6485 | ||
6486 | oursig = gdb_signal_from_name (argv[0]); | |
6487 | memset (argBuf, 0, bufLen); | |
6488 | if (strcmp (argv[1], "Q") == 0) | |
6489 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
6490 | else | |
6491 | { | |
6492 | if (strcmp (argv[1], "s") == 0) | |
6493 | { | |
6494 | if (!signal_stop[oursig]) | |
6495 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
6496 | else | |
6497 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
6498 | } | |
6499 | else if (strcmp (argv[1], "i") == 0) | |
6500 | { | |
6501 | if (!signal_program[oursig]) | |
6502 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
6503 | else | |
6504 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
6505 | } | |
6506 | else if (strcmp (argv[1], "r") == 0) | |
6507 | { | |
6508 | if (!signal_print[oursig]) | |
6509 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
6510 | else | |
6511 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
6512 | } | |
6513 | else | |
6514 | validFlag = 0; | |
6515 | } | |
6516 | if (validFlag) | |
6517 | handle_command (argBuf, from_tty); | |
6518 | else | |
6519 | printf_filtered (_("Invalid signal handling flag.\n")); | |
6520 | if (argBuf) | |
6521 | xfree (argBuf); | |
6522 | } | |
6523 | } | |
6524 | do_cleanups (old_chain); | |
6525 | } | |
6526 | ||
6527 | enum gdb_signal | |
6528 | gdb_signal_from_command (int num) | |
6529 | { | |
6530 | if (num >= 1 && num <= 15) | |
6531 | return (enum gdb_signal) num; | |
6532 | error (_("Only signals 1-15 are valid as numeric signals.\n\ | |
6533 | Use \"info signals\" for a list of symbolic signals.")); | |
6534 | } | |
6535 | ||
6536 | /* Print current contents of the tables set by the handle command. | |
6537 | It is possible we should just be printing signals actually used | |
6538 | by the current target (but for things to work right when switching | |
6539 | targets, all signals should be in the signal tables). */ | |
6540 | ||
6541 | static void | |
6542 | signals_info (char *signum_exp, int from_tty) | |
6543 | { | |
6544 | enum gdb_signal oursig; | |
6545 | ||
6546 | sig_print_header (); | |
6547 | ||
6548 | if (signum_exp) | |
6549 | { | |
6550 | /* First see if this is a symbol name. */ | |
6551 | oursig = gdb_signal_from_name (signum_exp); | |
6552 | if (oursig == GDB_SIGNAL_UNKNOWN) | |
6553 | { | |
6554 | /* No, try numeric. */ | |
6555 | oursig = | |
6556 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); | |
6557 | } | |
6558 | sig_print_info (oursig); | |
6559 | return; | |
6560 | } | |
6561 | ||
6562 | printf_filtered ("\n"); | |
6563 | /* These ugly casts brought to you by the native VAX compiler. */ | |
6564 | for (oursig = GDB_SIGNAL_FIRST; | |
6565 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
6566 | oursig = (enum gdb_signal) ((int) oursig + 1)) | |
6567 | { | |
6568 | QUIT; | |
6569 | ||
6570 | if (oursig != GDB_SIGNAL_UNKNOWN | |
6571 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
6572 | sig_print_info (oursig); | |
6573 | } | |
6574 | ||
6575 | printf_filtered (_("\nUse the \"handle\" command " | |
6576 | "to change these tables.\n")); | |
6577 | } | |
6578 | ||
6579 | /* Check if it makes sense to read $_siginfo from the current thread | |
6580 | at this point. If not, throw an error. */ | |
6581 | ||
6582 | static void | |
6583 | validate_siginfo_access (void) | |
6584 | { | |
6585 | /* No current inferior, no siginfo. */ | |
6586 | if (ptid_equal (inferior_ptid, null_ptid)) | |
6587 | error (_("No thread selected.")); | |
6588 | ||
6589 | /* Don't try to read from a dead thread. */ | |
6590 | if (is_exited (inferior_ptid)) | |
6591 | error (_("The current thread has terminated")); | |
6592 | ||
6593 | /* ... or from a spinning thread. */ | |
6594 | if (is_running (inferior_ptid)) | |
6595 | error (_("Selected thread is running.")); | |
6596 | } | |
6597 | ||
6598 | /* The $_siginfo convenience variable is a bit special. We don't know | |
6599 | for sure the type of the value until we actually have a chance to | |
6600 | fetch the data. The type can change depending on gdbarch, so it is | |
6601 | also dependent on which thread you have selected. | |
6602 | ||
6603 | 1. making $_siginfo be an internalvar that creates a new value on | |
6604 | access. | |
6605 | ||
6606 | 2. making the value of $_siginfo be an lval_computed value. */ | |
6607 | ||
6608 | /* This function implements the lval_computed support for reading a | |
6609 | $_siginfo value. */ | |
6610 | ||
6611 | static void | |
6612 | siginfo_value_read (struct value *v) | |
6613 | { | |
6614 | LONGEST transferred; | |
6615 | ||
6616 | validate_siginfo_access (); | |
6617 | ||
6618 | transferred = | |
6619 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
6620 | NULL, | |
6621 | value_contents_all_raw (v), | |
6622 | value_offset (v), | |
6623 | TYPE_LENGTH (value_type (v))); | |
6624 | ||
6625 | if (transferred != TYPE_LENGTH (value_type (v))) | |
6626 | error (_("Unable to read siginfo")); | |
6627 | } | |
6628 | ||
6629 | /* This function implements the lval_computed support for writing a | |
6630 | $_siginfo value. */ | |
6631 | ||
6632 | static void | |
6633 | siginfo_value_write (struct value *v, struct value *fromval) | |
6634 | { | |
6635 | LONGEST transferred; | |
6636 | ||
6637 | validate_siginfo_access (); | |
6638 | ||
6639 | transferred = target_write (¤t_target, | |
6640 | TARGET_OBJECT_SIGNAL_INFO, | |
6641 | NULL, | |
6642 | value_contents_all_raw (fromval), | |
6643 | value_offset (v), | |
6644 | TYPE_LENGTH (value_type (fromval))); | |
6645 | ||
6646 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
6647 | error (_("Unable to write siginfo")); | |
6648 | } | |
6649 | ||
6650 | static const struct lval_funcs siginfo_value_funcs = | |
6651 | { | |
6652 | siginfo_value_read, | |
6653 | siginfo_value_write | |
6654 | }; | |
6655 | ||
6656 | /* Return a new value with the correct type for the siginfo object of | |
6657 | the current thread using architecture GDBARCH. Return a void value | |
6658 | if there's no object available. */ | |
6659 | ||
6660 | static struct value * | |
6661 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, | |
6662 | void *ignore) | |
6663 | { | |
6664 | if (target_has_stack | |
6665 | && !ptid_equal (inferior_ptid, null_ptid) | |
6666 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
6667 | { | |
6668 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
6669 | ||
6670 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); | |
6671 | } | |
6672 | ||
6673 | return allocate_value (builtin_type (gdbarch)->builtin_void); | |
6674 | } | |
6675 | ||
6676 | \f | |
6677 | /* infcall_suspend_state contains state about the program itself like its | |
6678 | registers and any signal it received when it last stopped. | |
6679 | This state must be restored regardless of how the inferior function call | |
6680 | ends (either successfully, or after it hits a breakpoint or signal) | |
6681 | if the program is to properly continue where it left off. */ | |
6682 | ||
6683 | struct infcall_suspend_state | |
6684 | { | |
6685 | struct thread_suspend_state thread_suspend; | |
6686 | #if 0 /* Currently unused and empty structures are not valid C. */ | |
6687 | struct inferior_suspend_state inferior_suspend; | |
6688 | #endif | |
6689 | ||
6690 | /* Other fields: */ | |
6691 | CORE_ADDR stop_pc; | |
6692 | struct regcache *registers; | |
6693 | ||
6694 | /* Format of SIGINFO_DATA or NULL if it is not present. */ | |
6695 | struct gdbarch *siginfo_gdbarch; | |
6696 | ||
6697 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
6698 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
6699 | content would be invalid. */ | |
6700 | gdb_byte *siginfo_data; | |
6701 | }; | |
6702 | ||
6703 | struct infcall_suspend_state * | |
6704 | save_infcall_suspend_state (void) | |
6705 | { | |
6706 | struct infcall_suspend_state *inf_state; | |
6707 | struct thread_info *tp = inferior_thread (); | |
6708 | struct inferior *inf = current_inferior (); | |
6709 | struct regcache *regcache = get_current_regcache (); | |
6710 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
6711 | gdb_byte *siginfo_data = NULL; | |
6712 | ||
6713 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
6714 | { | |
6715 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
6716 | size_t len = TYPE_LENGTH (type); | |
6717 | struct cleanup *back_to; | |
6718 | ||
6719 | siginfo_data = xmalloc (len); | |
6720 | back_to = make_cleanup (xfree, siginfo_data); | |
6721 | ||
6722 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6723 | siginfo_data, 0, len) == len) | |
6724 | discard_cleanups (back_to); | |
6725 | else | |
6726 | { | |
6727 | /* Errors ignored. */ | |
6728 | do_cleanups (back_to); | |
6729 | siginfo_data = NULL; | |
6730 | } | |
6731 | } | |
6732 | ||
6733 | inf_state = XZALLOC (struct infcall_suspend_state); | |
6734 | ||
6735 | if (siginfo_data) | |
6736 | { | |
6737 | inf_state->siginfo_gdbarch = gdbarch; | |
6738 | inf_state->siginfo_data = siginfo_data; | |
6739 | } | |
6740 | ||
6741 | inf_state->thread_suspend = tp->suspend; | |
6742 | #if 0 /* Currently unused and empty structures are not valid C. */ | |
6743 | inf_state->inferior_suspend = inf->suspend; | |
6744 | #endif | |
6745 | ||
6746 | /* run_inferior_call will not use the signal due to its `proceed' call with | |
6747 | GDB_SIGNAL_0 anyway. */ | |
6748 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
6749 | ||
6750 | inf_state->stop_pc = stop_pc; | |
6751 | ||
6752 | inf_state->registers = regcache_dup (regcache); | |
6753 | ||
6754 | return inf_state; | |
6755 | } | |
6756 | ||
6757 | /* Restore inferior session state to INF_STATE. */ | |
6758 | ||
6759 | void | |
6760 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) | |
6761 | { | |
6762 | struct thread_info *tp = inferior_thread (); | |
6763 | struct inferior *inf = current_inferior (); | |
6764 | struct regcache *regcache = get_current_regcache (); | |
6765 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
6766 | ||
6767 | tp->suspend = inf_state->thread_suspend; | |
6768 | #if 0 /* Currently unused and empty structures are not valid C. */ | |
6769 | inf->suspend = inf_state->inferior_suspend; | |
6770 | #endif | |
6771 | ||
6772 | stop_pc = inf_state->stop_pc; | |
6773 | ||
6774 | if (inf_state->siginfo_gdbarch == gdbarch) | |
6775 | { | |
6776 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
6777 | ||
6778 | /* Errors ignored. */ | |
6779 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6780 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); | |
6781 | } | |
6782 | ||
6783 | /* The inferior can be gone if the user types "print exit(0)" | |
6784 | (and perhaps other times). */ | |
6785 | if (target_has_execution) | |
6786 | /* NB: The register write goes through to the target. */ | |
6787 | regcache_cpy (regcache, inf_state->registers); | |
6788 | ||
6789 | discard_infcall_suspend_state (inf_state); | |
6790 | } | |
6791 | ||
6792 | static void | |
6793 | do_restore_infcall_suspend_state_cleanup (void *state) | |
6794 | { | |
6795 | restore_infcall_suspend_state (state); | |
6796 | } | |
6797 | ||
6798 | struct cleanup * | |
6799 | make_cleanup_restore_infcall_suspend_state | |
6800 | (struct infcall_suspend_state *inf_state) | |
6801 | { | |
6802 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); | |
6803 | } | |
6804 | ||
6805 | void | |
6806 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) | |
6807 | { | |
6808 | regcache_xfree (inf_state->registers); | |
6809 | xfree (inf_state->siginfo_data); | |
6810 | xfree (inf_state); | |
6811 | } | |
6812 | ||
6813 | struct regcache * | |
6814 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) | |
6815 | { | |
6816 | return inf_state->registers; | |
6817 | } | |
6818 | ||
6819 | /* infcall_control_state contains state regarding gdb's control of the | |
6820 | inferior itself like stepping control. It also contains session state like | |
6821 | the user's currently selected frame. */ | |
6822 | ||
6823 | struct infcall_control_state | |
6824 | { | |
6825 | struct thread_control_state thread_control; | |
6826 | struct inferior_control_state inferior_control; | |
6827 | ||
6828 | /* Other fields: */ | |
6829 | enum stop_stack_kind stop_stack_dummy; | |
6830 | int stopped_by_random_signal; | |
6831 | int stop_after_trap; | |
6832 | ||
6833 | /* ID if the selected frame when the inferior function call was made. */ | |
6834 | struct frame_id selected_frame_id; | |
6835 | }; | |
6836 | ||
6837 | /* Save all of the information associated with the inferior<==>gdb | |
6838 | connection. */ | |
6839 | ||
6840 | struct infcall_control_state * | |
6841 | save_infcall_control_state (void) | |
6842 | { | |
6843 | struct infcall_control_state *inf_status = xmalloc (sizeof (*inf_status)); | |
6844 | struct thread_info *tp = inferior_thread (); | |
6845 | struct inferior *inf = current_inferior (); | |
6846 | ||
6847 | inf_status->thread_control = tp->control; | |
6848 | inf_status->inferior_control = inf->control; | |
6849 | ||
6850 | tp->control.step_resume_breakpoint = NULL; | |
6851 | tp->control.exception_resume_breakpoint = NULL; | |
6852 | ||
6853 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of | |
6854 | chain. If caller's caller is walking the chain, they'll be happier if we | |
6855 | hand them back the original chain when restore_infcall_control_state is | |
6856 | called. */ | |
6857 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
6858 | ||
6859 | /* Other fields: */ | |
6860 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
6861 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
6862 | inf_status->stop_after_trap = stop_after_trap; | |
6863 | ||
6864 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); | |
6865 | ||
6866 | return inf_status; | |
6867 | } | |
6868 | ||
6869 | static int | |
6870 | restore_selected_frame (void *args) | |
6871 | { | |
6872 | struct frame_id *fid = (struct frame_id *) args; | |
6873 | struct frame_info *frame; | |
6874 | ||
6875 | frame = frame_find_by_id (*fid); | |
6876 | ||
6877 | /* If inf_status->selected_frame_id is NULL, there was no previously | |
6878 | selected frame. */ | |
6879 | if (frame == NULL) | |
6880 | { | |
6881 | warning (_("Unable to restore previously selected frame.")); | |
6882 | return 0; | |
6883 | } | |
6884 | ||
6885 | select_frame (frame); | |
6886 | ||
6887 | return (1); | |
6888 | } | |
6889 | ||
6890 | /* Restore inferior session state to INF_STATUS. */ | |
6891 | ||
6892 | void | |
6893 | restore_infcall_control_state (struct infcall_control_state *inf_status) | |
6894 | { | |
6895 | struct thread_info *tp = inferior_thread (); | |
6896 | struct inferior *inf = current_inferior (); | |
6897 | ||
6898 | if (tp->control.step_resume_breakpoint) | |
6899 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
6900 | ||
6901 | if (tp->control.exception_resume_breakpoint) | |
6902 | tp->control.exception_resume_breakpoint->disposition | |
6903 | = disp_del_at_next_stop; | |
6904 | ||
6905 | /* Handle the bpstat_copy of the chain. */ | |
6906 | bpstat_clear (&tp->control.stop_bpstat); | |
6907 | ||
6908 | tp->control = inf_status->thread_control; | |
6909 | inf->control = inf_status->inferior_control; | |
6910 | ||
6911 | /* Other fields: */ | |
6912 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
6913 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
6914 | stop_after_trap = inf_status->stop_after_trap; | |
6915 | ||
6916 | if (target_has_stack) | |
6917 | { | |
6918 | /* The point of catch_errors is that if the stack is clobbered, | |
6919 | walking the stack might encounter a garbage pointer and | |
6920 | error() trying to dereference it. */ | |
6921 | if (catch_errors | |
6922 | (restore_selected_frame, &inf_status->selected_frame_id, | |
6923 | "Unable to restore previously selected frame:\n", | |
6924 | RETURN_MASK_ERROR) == 0) | |
6925 | /* Error in restoring the selected frame. Select the innermost | |
6926 | frame. */ | |
6927 | select_frame (get_current_frame ()); | |
6928 | } | |
6929 | ||
6930 | xfree (inf_status); | |
6931 | } | |
6932 | ||
6933 | static void | |
6934 | do_restore_infcall_control_state_cleanup (void *sts) | |
6935 | { | |
6936 | restore_infcall_control_state (sts); | |
6937 | } | |
6938 | ||
6939 | struct cleanup * | |
6940 | make_cleanup_restore_infcall_control_state | |
6941 | (struct infcall_control_state *inf_status) | |
6942 | { | |
6943 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); | |
6944 | } | |
6945 | ||
6946 | void | |
6947 | discard_infcall_control_state (struct infcall_control_state *inf_status) | |
6948 | { | |
6949 | if (inf_status->thread_control.step_resume_breakpoint) | |
6950 | inf_status->thread_control.step_resume_breakpoint->disposition | |
6951 | = disp_del_at_next_stop; | |
6952 | ||
6953 | if (inf_status->thread_control.exception_resume_breakpoint) | |
6954 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
6955 | = disp_del_at_next_stop; | |
6956 | ||
6957 | /* See save_infcall_control_state for info on stop_bpstat. */ | |
6958 | bpstat_clear (&inf_status->thread_control.stop_bpstat); | |
6959 | ||
6960 | xfree (inf_status); | |
6961 | } | |
6962 | \f | |
6963 | int | |
6964 | ptid_match (ptid_t ptid, ptid_t filter) | |
6965 | { | |
6966 | if (ptid_equal (filter, minus_one_ptid)) | |
6967 | return 1; | |
6968 | if (ptid_is_pid (filter) | |
6969 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
6970 | return 1; | |
6971 | else if (ptid_equal (ptid, filter)) | |
6972 | return 1; | |
6973 | ||
6974 | return 0; | |
6975 | } | |
6976 | ||
6977 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
6978 | to restore the inferior_ptid value saved in a call to | |
6979 | save_inferior_ptid(). */ | |
6980 | ||
6981 | static void | |
6982 | restore_inferior_ptid (void *arg) | |
6983 | { | |
6984 | ptid_t *saved_ptid_ptr = arg; | |
6985 | ||
6986 | inferior_ptid = *saved_ptid_ptr; | |
6987 | xfree (arg); | |
6988 | } | |
6989 | ||
6990 | /* Save the value of inferior_ptid so that it may be restored by a | |
6991 | later call to do_cleanups(). Returns the struct cleanup pointer | |
6992 | needed for later doing the cleanup. */ | |
6993 | ||
6994 | struct cleanup * | |
6995 | save_inferior_ptid (void) | |
6996 | { | |
6997 | ptid_t *saved_ptid_ptr; | |
6998 | ||
6999 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
7000 | *saved_ptid_ptr = inferior_ptid; | |
7001 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
7002 | } | |
7003 | \f | |
7004 | ||
7005 | /* User interface for reverse debugging: | |
7006 | Set exec-direction / show exec-direction commands | |
7007 | (returns error unless target implements to_set_exec_direction method). */ | |
7008 | ||
7009 | int execution_direction = EXEC_FORWARD; | |
7010 | static const char exec_forward[] = "forward"; | |
7011 | static const char exec_reverse[] = "reverse"; | |
7012 | static const char *exec_direction = exec_forward; | |
7013 | static const char *const exec_direction_names[] = { | |
7014 | exec_forward, | |
7015 | exec_reverse, | |
7016 | NULL | |
7017 | }; | |
7018 | ||
7019 | static void | |
7020 | set_exec_direction_func (char *args, int from_tty, | |
7021 | struct cmd_list_element *cmd) | |
7022 | { | |
7023 | if (target_can_execute_reverse) | |
7024 | { | |
7025 | if (!strcmp (exec_direction, exec_forward)) | |
7026 | execution_direction = EXEC_FORWARD; | |
7027 | else if (!strcmp (exec_direction, exec_reverse)) | |
7028 | execution_direction = EXEC_REVERSE; | |
7029 | } | |
7030 | else | |
7031 | { | |
7032 | exec_direction = exec_forward; | |
7033 | error (_("Target does not support this operation.")); | |
7034 | } | |
7035 | } | |
7036 | ||
7037 | static void | |
7038 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
7039 | struct cmd_list_element *cmd, const char *value) | |
7040 | { | |
7041 | switch (execution_direction) { | |
7042 | case EXEC_FORWARD: | |
7043 | fprintf_filtered (out, _("Forward.\n")); | |
7044 | break; | |
7045 | case EXEC_REVERSE: | |
7046 | fprintf_filtered (out, _("Reverse.\n")); | |
7047 | break; | |
7048 | default: | |
7049 | internal_error (__FILE__, __LINE__, | |
7050 | _("bogus execution_direction value: %d"), | |
7051 | (int) execution_direction); | |
7052 | } | |
7053 | } | |
7054 | ||
7055 | /* User interface for non-stop mode. */ | |
7056 | ||
7057 | int non_stop = 0; | |
7058 | ||
7059 | static void | |
7060 | set_non_stop (char *args, int from_tty, | |
7061 | struct cmd_list_element *c) | |
7062 | { | |
7063 | if (target_has_execution) | |
7064 | { | |
7065 | non_stop_1 = non_stop; | |
7066 | error (_("Cannot change this setting while the inferior is running.")); | |
7067 | } | |
7068 | ||
7069 | non_stop = non_stop_1; | |
7070 | } | |
7071 | ||
7072 | static void | |
7073 | show_non_stop (struct ui_file *file, int from_tty, | |
7074 | struct cmd_list_element *c, const char *value) | |
7075 | { | |
7076 | fprintf_filtered (file, | |
7077 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
7078 | value); | |
7079 | } | |
7080 | ||
7081 | static void | |
7082 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
7083 | struct cmd_list_element *c, const char *value) | |
7084 | { | |
7085 | fprintf_filtered (file, _("Resuming the execution of threads " | |
7086 | "of all processes is %s.\n"), value); | |
7087 | } | |
7088 | ||
7089 | /* Implementation of `siginfo' variable. */ | |
7090 | ||
7091 | static const struct internalvar_funcs siginfo_funcs = | |
7092 | { | |
7093 | siginfo_make_value, | |
7094 | NULL, | |
7095 | NULL | |
7096 | }; | |
7097 | ||
7098 | void | |
7099 | _initialize_infrun (void) | |
7100 | { | |
7101 | int i; | |
7102 | int numsigs; | |
7103 | struct cmd_list_element *c; | |
7104 | ||
7105 | add_info ("signals", signals_info, _("\ | |
7106 | What debugger does when program gets various signals.\n\ | |
7107 | Specify a signal as argument to print info on that signal only.")); | |
7108 | add_info_alias ("handle", "signals", 0); | |
7109 | ||
7110 | c = add_com ("handle", class_run, handle_command, _("\ | |
7111 | Specify how to handle signals.\n\ | |
7112 | Usage: handle SIGNAL [ACTIONS]\n\ | |
7113 | Args are signals and actions to apply to those signals.\n\ | |
7114 | If no actions are specified, the current settings for the specified signals\n\ | |
7115 | will be displayed instead.\n\ | |
7116 | \n\ | |
7117 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
7118 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7119 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7120 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
7121 | used by the debugger, typically SIGTRAP and SIGINT.\n\ | |
7122 | \n\ | |
7123 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
7124 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ | |
7125 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7126 | Print means print a message if this signal happens.\n\ | |
7127 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7128 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
7129 | Pass and Stop may be combined.\n\ | |
7130 | \n\ | |
7131 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
7132 | may be interspersed with actions, with the actions being performed for\n\ | |
7133 | all signals cumulatively specified.")); | |
7134 | set_cmd_completer (c, handle_completer); | |
7135 | ||
7136 | if (xdb_commands) | |
7137 | { | |
7138 | add_com ("lz", class_info, signals_info, _("\ | |
7139 | What debugger does when program gets various signals.\n\ | |
7140 | Specify a signal as argument to print info on that signal only.")); | |
7141 | add_com ("z", class_run, xdb_handle_command, _("\ | |
7142 | Specify how to handle a signal.\n\ | |
7143 | Args are signals and actions to apply to those signals.\n\ | |
7144 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
7145 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7146 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7147 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
7148 | used by the debugger, typically SIGTRAP and SIGINT.\n\ | |
7149 | Recognized actions include \"s\" (toggles between stop and nostop),\n\ | |
7150 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ | |
7151 | nopass), \"Q\" (noprint)\n\ | |
7152 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7153 | Print means print a message if this signal happens.\n\ | |
7154 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7155 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
7156 | Pass and Stop may be combined.")); | |
7157 | } | |
7158 | ||
7159 | if (!dbx_commands) | |
7160 | stop_command = add_cmd ("stop", class_obscure, | |
7161 | not_just_help_class_command, _("\ | |
7162 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
7163 | This allows you to set a list of commands to be run each time execution\n\ | |
7164 | of the program stops."), &cmdlist); | |
7165 | ||
7166 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ | |
7167 | Set inferior debugging."), _("\ | |
7168 | Show inferior debugging."), _("\ | |
7169 | When non-zero, inferior specific debugging is enabled."), | |
7170 | NULL, | |
7171 | show_debug_infrun, | |
7172 | &setdebuglist, &showdebuglist); | |
7173 | ||
7174 | add_setshow_boolean_cmd ("displaced", class_maintenance, | |
7175 | &debug_displaced, _("\ | |
7176 | Set displaced stepping debugging."), _("\ | |
7177 | Show displaced stepping debugging."), _("\ | |
7178 | When non-zero, displaced stepping specific debugging is enabled."), | |
7179 | NULL, | |
7180 | show_debug_displaced, | |
7181 | &setdebuglist, &showdebuglist); | |
7182 | ||
7183 | add_setshow_boolean_cmd ("non-stop", no_class, | |
7184 | &non_stop_1, _("\ | |
7185 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
7186 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
7187 | When debugging a multi-threaded program and this setting is\n\ | |
7188 | off (the default, also called all-stop mode), when one thread stops\n\ | |
7189 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
7190 | all other threads in the program while you interact with the thread of\n\ | |
7191 | interest. When you continue or step a thread, you can allow the other\n\ | |
7192 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
7193 | thread's state, all threads stop.\n\ | |
7194 | \n\ | |
7195 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
7196 | to run freely. You'll be able to step each thread independently,\n\ | |
7197 | leave it stopped or free to run as needed."), | |
7198 | set_non_stop, | |
7199 | show_non_stop, | |
7200 | &setlist, | |
7201 | &showlist); | |
7202 | ||
7203 | numsigs = (int) GDB_SIGNAL_LAST; | |
7204 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); | |
7205 | signal_print = (unsigned char *) | |
7206 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
7207 | signal_program = (unsigned char *) | |
7208 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
7209 | signal_pass = (unsigned char *) | |
7210 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
7211 | for (i = 0; i < numsigs; i++) | |
7212 | { | |
7213 | signal_stop[i] = 1; | |
7214 | signal_print[i] = 1; | |
7215 | signal_program[i] = 1; | |
7216 | } | |
7217 | ||
7218 | /* Signals caused by debugger's own actions | |
7219 | should not be given to the program afterwards. */ | |
7220 | signal_program[GDB_SIGNAL_TRAP] = 0; | |
7221 | signal_program[GDB_SIGNAL_INT] = 0; | |
7222 | ||
7223 | /* Signals that are not errors should not normally enter the debugger. */ | |
7224 | signal_stop[GDB_SIGNAL_ALRM] = 0; | |
7225 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
7226 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
7227 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
7228 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
7229 | signal_print[GDB_SIGNAL_PROF] = 0; | |
7230 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
7231 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
7232 | signal_stop[GDB_SIGNAL_IO] = 0; | |
7233 | signal_print[GDB_SIGNAL_IO] = 0; | |
7234 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
7235 | signal_print[GDB_SIGNAL_POLL] = 0; | |
7236 | signal_stop[GDB_SIGNAL_URG] = 0; | |
7237 | signal_print[GDB_SIGNAL_URG] = 0; | |
7238 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
7239 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
7240 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
7241 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
7242 | ||
7243 | /* These signals are used internally by user-level thread | |
7244 | implementations. (See signal(5) on Solaris.) Like the above | |
7245 | signals, a healthy program receives and handles them as part of | |
7246 | its normal operation. */ | |
7247 | signal_stop[GDB_SIGNAL_LWP] = 0; | |
7248 | signal_print[GDB_SIGNAL_LWP] = 0; | |
7249 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
7250 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
7251 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
7252 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
7253 | ||
7254 | /* Update cached state. */ | |
7255 | signal_cache_update (-1); | |
7256 | ||
7257 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, | |
7258 | &stop_on_solib_events, _("\ | |
7259 | Set stopping for shared library events."), _("\ | |
7260 | Show stopping for shared library events."), _("\ | |
7261 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
7262 | notifies gdb of shared library events. The most common event of interest\n\ | |
7263 | to the user would be loading/unloading of a new library."), | |
7264 | NULL, | |
7265 | show_stop_on_solib_events, | |
7266 | &setlist, &showlist); | |
7267 | ||
7268 | add_setshow_enum_cmd ("follow-fork-mode", class_run, | |
7269 | follow_fork_mode_kind_names, | |
7270 | &follow_fork_mode_string, _("\ | |
7271 | Set debugger response to a program call of fork or vfork."), _("\ | |
7272 | Show debugger response to a program call of fork or vfork."), _("\ | |
7273 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
7274 | parent - the original process is debugged after a fork\n\ | |
7275 | child - the new process is debugged after a fork\n\ | |
7276 | The unfollowed process will continue to run.\n\ | |
7277 | By default, the debugger will follow the parent process."), | |
7278 | NULL, | |
7279 | show_follow_fork_mode_string, | |
7280 | &setlist, &showlist); | |
7281 | ||
7282 | add_setshow_enum_cmd ("follow-exec-mode", class_run, | |
7283 | follow_exec_mode_names, | |
7284 | &follow_exec_mode_string, _("\ | |
7285 | Set debugger response to a program call of exec."), _("\ | |
7286 | Show debugger response to a program call of exec."), _("\ | |
7287 | An exec call replaces the program image of a process.\n\ | |
7288 | \n\ | |
7289 | follow-exec-mode can be:\n\ | |
7290 | \n\ | |
7291 | new - the debugger creates a new inferior and rebinds the process\n\ | |
7292 | to this new inferior. The program the process was running before\n\ | |
7293 | the exec call can be restarted afterwards by restarting the original\n\ | |
7294 | inferior.\n\ | |
7295 | \n\ | |
7296 | same - the debugger keeps the process bound to the same inferior.\n\ | |
7297 | The new executable image replaces the previous executable loaded in\n\ | |
7298 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
7299 | the executable the process was running after the exec call.\n\ | |
7300 | \n\ | |
7301 | By default, the debugger will use the same inferior."), | |
7302 | NULL, | |
7303 | show_follow_exec_mode_string, | |
7304 | &setlist, &showlist); | |
7305 | ||
7306 | add_setshow_enum_cmd ("scheduler-locking", class_run, | |
7307 | scheduler_enums, &scheduler_mode, _("\ | |
7308 | Set mode for locking scheduler during execution."), _("\ | |
7309 | Show mode for locking scheduler during execution."), _("\ | |
7310 | off == no locking (threads may preempt at any time)\n\ | |
7311 | on == full locking (no thread except the current thread may run)\n\ | |
7312 | step == scheduler locked during every single-step operation.\n\ | |
7313 | In this mode, no other thread may run during a step command.\n\ | |
7314 | Other threads may run while stepping over a function call ('next')."), | |
7315 | set_schedlock_func, /* traps on target vector */ | |
7316 | show_scheduler_mode, | |
7317 | &setlist, &showlist); | |
7318 | ||
7319 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ | |
7320 | Set mode for resuming threads of all processes."), _("\ | |
7321 | Show mode for resuming threads of all processes."), _("\ | |
7322 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
7323 | threads of all processes. When off (which is the default), execution\n\ | |
7324 | commands only resume the threads of the current process. The set of\n\ | |
7325 | threads that are resumed is further refined by the scheduler-locking\n\ | |
7326 | mode (see help set scheduler-locking)."), | |
7327 | NULL, | |
7328 | show_schedule_multiple, | |
7329 | &setlist, &showlist); | |
7330 | ||
7331 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ | |
7332 | Set mode of the step operation."), _("\ | |
7333 | Show mode of the step operation."), _("\ | |
7334 | When set, doing a step over a function without debug line information\n\ | |
7335 | will stop at the first instruction of that function. Otherwise, the\n\ | |
7336 | function is skipped and the step command stops at a different source line."), | |
7337 | NULL, | |
7338 | show_step_stop_if_no_debug, | |
7339 | &setlist, &showlist); | |
7340 | ||
7341 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, | |
7342 | &can_use_displaced_stepping, _("\ | |
7343 | Set debugger's willingness to use displaced stepping."), _("\ | |
7344 | Show debugger's willingness to use displaced stepping."), _("\ | |
7345 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ | |
7346 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
7347 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
7348 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
7349 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
7350 | use it in all-stop mode (see help set non-stop)."), | |
7351 | NULL, | |
7352 | show_can_use_displaced_stepping, | |
7353 | &setlist, &showlist); | |
7354 | ||
7355 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, | |
7356 | &exec_direction, _("Set direction of execution.\n\ | |
7357 | Options are 'forward' or 'reverse'."), | |
7358 | _("Show direction of execution (forward/reverse)."), | |
7359 | _("Tells gdb whether to execute forward or backward."), | |
7360 | set_exec_direction_func, show_exec_direction_func, | |
7361 | &setlist, &showlist); | |
7362 | ||
7363 | /* Set/show detach-on-fork: user-settable mode. */ | |
7364 | ||
7365 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
7366 | Set whether gdb will detach the child of a fork."), _("\ | |
7367 | Show whether gdb will detach the child of a fork."), _("\ | |
7368 | Tells gdb whether to detach the child of a fork."), | |
7369 | NULL, NULL, &setlist, &showlist); | |
7370 | ||
7371 | /* Set/show disable address space randomization mode. */ | |
7372 | ||
7373 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
7374 | &disable_randomization, _("\ | |
7375 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
7376 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
7377 | When this mode is on (which is the default), randomization of the virtual\n\ | |
7378 | address space is disabled. Standalone programs run with the randomization\n\ | |
7379 | enabled by default on some platforms."), | |
7380 | &set_disable_randomization, | |
7381 | &show_disable_randomization, | |
7382 | &setlist, &showlist); | |
7383 | ||
7384 | /* ptid initializations */ | |
7385 | inferior_ptid = null_ptid; | |
7386 | target_last_wait_ptid = minus_one_ptid; | |
7387 | ||
7388 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
7389 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); | |
7390 | observer_attach_thread_exit (infrun_thread_thread_exit); | |
7391 | observer_attach_inferior_exit (infrun_inferior_exit); | |
7392 | ||
7393 | /* Explicitly create without lookup, since that tries to create a | |
7394 | value with a void typed value, and when we get here, gdbarch | |
7395 | isn't initialized yet. At this point, we're quite sure there | |
7396 | isn't another convenience variable of the same name. */ | |
7397 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); | |
7398 | ||
7399 | add_setshow_boolean_cmd ("observer", no_class, | |
7400 | &observer_mode_1, _("\ | |
7401 | Set whether gdb controls the inferior in observer mode."), _("\ | |
7402 | Show whether gdb controls the inferior in observer mode."), _("\ | |
7403 | In observer mode, GDB can get data from the inferior, but not\n\ | |
7404 | affect its execution. Registers and memory may not be changed,\n\ | |
7405 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
7406 | or signalled."), | |
7407 | set_observer_mode, | |
7408 | show_observer_mode, | |
7409 | &setlist, | |
7410 | &showlist); | |
7411 | } |