Commit | Line | Data |
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afedecd3 MM |
1 | /* Branch trace support for GDB, the GNU debugger. |
2 | ||
32d0add0 | 3 | Copyright (C) 2013-2015 Free Software Foundation, Inc. |
afedecd3 MM |
4 | |
5 | Contributed by Intel Corp. <markus.t.metzger@intel.com> | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "record.h" | |
24 | #include "gdbthread.h" | |
25 | #include "target.h" | |
26 | #include "gdbcmd.h" | |
27 | #include "disasm.h" | |
28 | #include "observer.h" | |
afedecd3 MM |
29 | #include "cli/cli-utils.h" |
30 | #include "source.h" | |
31 | #include "ui-out.h" | |
32 | #include "symtab.h" | |
33 | #include "filenames.h" | |
1f3ef581 | 34 | #include "regcache.h" |
cecac1ab | 35 | #include "frame-unwind.h" |
0b722aec | 36 | #include "hashtab.h" |
45741a9c | 37 | #include "infrun.h" |
70ad5bff MM |
38 | #include "event-loop.h" |
39 | #include "inf-loop.h" | |
afedecd3 MM |
40 | |
41 | /* The target_ops of record-btrace. */ | |
42 | static struct target_ops record_btrace_ops; | |
43 | ||
44 | /* A new thread observer enabling branch tracing for the new thread. */ | |
45 | static struct observer *record_btrace_thread_observer; | |
46 | ||
67b5c0c1 MM |
47 | /* Memory access types used in set/show record btrace replay-memory-access. */ |
48 | static const char replay_memory_access_read_only[] = "read-only"; | |
49 | static const char replay_memory_access_read_write[] = "read-write"; | |
50 | static const char *const replay_memory_access_types[] = | |
51 | { | |
52 | replay_memory_access_read_only, | |
53 | replay_memory_access_read_write, | |
54 | NULL | |
55 | }; | |
56 | ||
57 | /* The currently allowed replay memory access type. */ | |
58 | static const char *replay_memory_access = replay_memory_access_read_only; | |
59 | ||
60 | /* Command lists for "set/show record btrace". */ | |
61 | static struct cmd_list_element *set_record_btrace_cmdlist; | |
62 | static struct cmd_list_element *show_record_btrace_cmdlist; | |
633785ff | 63 | |
70ad5bff MM |
64 | /* The execution direction of the last resume we got. See record-full.c. */ |
65 | static enum exec_direction_kind record_btrace_resume_exec_dir = EXEC_FORWARD; | |
66 | ||
67 | /* The async event handler for reverse/replay execution. */ | |
68 | static struct async_event_handler *record_btrace_async_inferior_event_handler; | |
69 | ||
aef92902 MM |
70 | /* A flag indicating that we are currently generating a core file. */ |
71 | static int record_btrace_generating_corefile; | |
72 | ||
afedecd3 MM |
73 | /* Print a record-btrace debug message. Use do ... while (0) to avoid |
74 | ambiguities when used in if statements. */ | |
75 | ||
76 | #define DEBUG(msg, args...) \ | |
77 | do \ | |
78 | { \ | |
79 | if (record_debug != 0) \ | |
80 | fprintf_unfiltered (gdb_stdlog, \ | |
81 | "[record-btrace] " msg "\n", ##args); \ | |
82 | } \ | |
83 | while (0) | |
84 | ||
85 | ||
86 | /* Update the branch trace for the current thread and return a pointer to its | |
066ce621 | 87 | thread_info. |
afedecd3 MM |
88 | |
89 | Throws an error if there is no thread or no trace. This function never | |
90 | returns NULL. */ | |
91 | ||
066ce621 MM |
92 | static struct thread_info * |
93 | require_btrace_thread (void) | |
afedecd3 MM |
94 | { |
95 | struct thread_info *tp; | |
afedecd3 MM |
96 | |
97 | DEBUG ("require"); | |
98 | ||
99 | tp = find_thread_ptid (inferior_ptid); | |
100 | if (tp == NULL) | |
101 | error (_("No thread.")); | |
102 | ||
103 | btrace_fetch (tp); | |
104 | ||
6e07b1d2 | 105 | if (btrace_is_empty (tp)) |
afedecd3 MM |
106 | error (_("No trace.")); |
107 | ||
066ce621 MM |
108 | return tp; |
109 | } | |
110 | ||
111 | /* Update the branch trace for the current thread and return a pointer to its | |
112 | branch trace information struct. | |
113 | ||
114 | Throws an error if there is no thread or no trace. This function never | |
115 | returns NULL. */ | |
116 | ||
117 | static struct btrace_thread_info * | |
118 | require_btrace (void) | |
119 | { | |
120 | struct thread_info *tp; | |
121 | ||
122 | tp = require_btrace_thread (); | |
123 | ||
124 | return &tp->btrace; | |
afedecd3 MM |
125 | } |
126 | ||
127 | /* Enable branch tracing for one thread. Warn on errors. */ | |
128 | ||
129 | static void | |
130 | record_btrace_enable_warn (struct thread_info *tp) | |
131 | { | |
132 | volatile struct gdb_exception error; | |
133 | ||
134 | TRY_CATCH (error, RETURN_MASK_ERROR) | |
135 | btrace_enable (tp); | |
136 | ||
137 | if (error.message != NULL) | |
138 | warning ("%s", error.message); | |
139 | } | |
140 | ||
141 | /* Callback function to disable branch tracing for one thread. */ | |
142 | ||
143 | static void | |
144 | record_btrace_disable_callback (void *arg) | |
145 | { | |
146 | struct thread_info *tp; | |
147 | ||
148 | tp = arg; | |
149 | ||
150 | btrace_disable (tp); | |
151 | } | |
152 | ||
153 | /* Enable automatic tracing of new threads. */ | |
154 | ||
155 | static void | |
156 | record_btrace_auto_enable (void) | |
157 | { | |
158 | DEBUG ("attach thread observer"); | |
159 | ||
160 | record_btrace_thread_observer | |
161 | = observer_attach_new_thread (record_btrace_enable_warn); | |
162 | } | |
163 | ||
164 | /* Disable automatic tracing of new threads. */ | |
165 | ||
166 | static void | |
167 | record_btrace_auto_disable (void) | |
168 | { | |
169 | /* The observer may have been detached, already. */ | |
170 | if (record_btrace_thread_observer == NULL) | |
171 | return; | |
172 | ||
173 | DEBUG ("detach thread observer"); | |
174 | ||
175 | observer_detach_new_thread (record_btrace_thread_observer); | |
176 | record_btrace_thread_observer = NULL; | |
177 | } | |
178 | ||
70ad5bff MM |
179 | /* The record-btrace async event handler function. */ |
180 | ||
181 | static void | |
182 | record_btrace_handle_async_inferior_event (gdb_client_data data) | |
183 | { | |
184 | inferior_event_handler (INF_REG_EVENT, NULL); | |
185 | } | |
186 | ||
afedecd3 MM |
187 | /* The to_open method of target record-btrace. */ |
188 | ||
189 | static void | |
014f9477 | 190 | record_btrace_open (const char *args, int from_tty) |
afedecd3 MM |
191 | { |
192 | struct cleanup *disable_chain; | |
193 | struct thread_info *tp; | |
194 | ||
195 | DEBUG ("open"); | |
196 | ||
8213266a | 197 | record_preopen (); |
afedecd3 MM |
198 | |
199 | if (!target_has_execution) | |
200 | error (_("The program is not being run.")); | |
201 | ||
52834460 MM |
202 | if (non_stop) |
203 | error (_("Record btrace can't debug inferior in non-stop mode.")); | |
204 | ||
afedecd3 MM |
205 | gdb_assert (record_btrace_thread_observer == NULL); |
206 | ||
207 | disable_chain = make_cleanup (null_cleanup, NULL); | |
034f788c | 208 | ALL_NON_EXITED_THREADS (tp) |
afedecd3 MM |
209 | if (args == NULL || *args == 0 || number_is_in_list (args, tp->num)) |
210 | { | |
211 | btrace_enable (tp); | |
212 | ||
213 | make_cleanup (record_btrace_disable_callback, tp); | |
214 | } | |
215 | ||
216 | record_btrace_auto_enable (); | |
217 | ||
218 | push_target (&record_btrace_ops); | |
219 | ||
70ad5bff MM |
220 | record_btrace_async_inferior_event_handler |
221 | = create_async_event_handler (record_btrace_handle_async_inferior_event, | |
222 | NULL); | |
aef92902 | 223 | record_btrace_generating_corefile = 0; |
70ad5bff | 224 | |
afedecd3 MM |
225 | observer_notify_record_changed (current_inferior (), 1); |
226 | ||
227 | discard_cleanups (disable_chain); | |
228 | } | |
229 | ||
230 | /* The to_stop_recording method of target record-btrace. */ | |
231 | ||
232 | static void | |
c6cd7c02 | 233 | record_btrace_stop_recording (struct target_ops *self) |
afedecd3 MM |
234 | { |
235 | struct thread_info *tp; | |
236 | ||
237 | DEBUG ("stop recording"); | |
238 | ||
239 | record_btrace_auto_disable (); | |
240 | ||
034f788c | 241 | ALL_NON_EXITED_THREADS (tp) |
afedecd3 MM |
242 | if (tp->btrace.target != NULL) |
243 | btrace_disable (tp); | |
244 | } | |
245 | ||
246 | /* The to_close method of target record-btrace. */ | |
247 | ||
248 | static void | |
de90e03d | 249 | record_btrace_close (struct target_ops *self) |
afedecd3 | 250 | { |
568e808b MM |
251 | struct thread_info *tp; |
252 | ||
70ad5bff MM |
253 | if (record_btrace_async_inferior_event_handler != NULL) |
254 | delete_async_event_handler (&record_btrace_async_inferior_event_handler); | |
255 | ||
99c819ee MM |
256 | /* Make sure automatic recording gets disabled even if we did not stop |
257 | recording before closing the record-btrace target. */ | |
258 | record_btrace_auto_disable (); | |
259 | ||
568e808b MM |
260 | /* We should have already stopped recording. |
261 | Tear down btrace in case we have not. */ | |
034f788c | 262 | ALL_NON_EXITED_THREADS (tp) |
568e808b | 263 | btrace_teardown (tp); |
afedecd3 MM |
264 | } |
265 | ||
b7d2e916 PA |
266 | /* The to_async method of target record-btrace. */ |
267 | ||
268 | static void | |
269 | record_btrace_async (struct target_ops *ops, | |
270 | void (*callback) (enum inferior_event_type event_type, | |
271 | void *context), | |
272 | void *context) | |
273 | { | |
274 | if (callback != NULL) | |
275 | mark_async_event_handler (record_btrace_async_inferior_event_handler); | |
276 | else | |
277 | clear_async_event_handler (record_btrace_async_inferior_event_handler); | |
278 | ||
279 | ops->beneath->to_async (ops->beneath, callback, context); | |
280 | } | |
281 | ||
afedecd3 MM |
282 | /* The to_info_record method of target record-btrace. */ |
283 | ||
284 | static void | |
630d6a4a | 285 | record_btrace_info (struct target_ops *self) |
afedecd3 MM |
286 | { |
287 | struct btrace_thread_info *btinfo; | |
288 | struct thread_info *tp; | |
23a7fe75 | 289 | unsigned int insns, calls; |
afedecd3 MM |
290 | |
291 | DEBUG ("info"); | |
292 | ||
293 | tp = find_thread_ptid (inferior_ptid); | |
294 | if (tp == NULL) | |
295 | error (_("No thread.")); | |
296 | ||
297 | btrace_fetch (tp); | |
298 | ||
23a7fe75 MM |
299 | insns = 0; |
300 | calls = 0; | |
301 | ||
afedecd3 | 302 | btinfo = &tp->btrace; |
6e07b1d2 MM |
303 | |
304 | if (!btrace_is_empty (tp)) | |
23a7fe75 MM |
305 | { |
306 | struct btrace_call_iterator call; | |
307 | struct btrace_insn_iterator insn; | |
308 | ||
309 | btrace_call_end (&call, btinfo); | |
310 | btrace_call_prev (&call, 1); | |
5de9129b | 311 | calls = btrace_call_number (&call); |
23a7fe75 MM |
312 | |
313 | btrace_insn_end (&insn, btinfo); | |
314 | btrace_insn_prev (&insn, 1); | |
5de9129b | 315 | insns = btrace_insn_number (&insn); |
23a7fe75 | 316 | } |
afedecd3 MM |
317 | |
318 | printf_unfiltered (_("Recorded %u instructions in %u functions for thread " | |
23a7fe75 | 319 | "%d (%s).\n"), insns, calls, tp->num, |
afedecd3 | 320 | target_pid_to_str (tp->ptid)); |
07bbe694 MM |
321 | |
322 | if (btrace_is_replaying (tp)) | |
323 | printf_unfiltered (_("Replay in progress. At instruction %u.\n"), | |
324 | btrace_insn_number (btinfo->replay)); | |
afedecd3 MM |
325 | } |
326 | ||
327 | /* Print an unsigned int. */ | |
328 | ||
329 | static void | |
330 | ui_out_field_uint (struct ui_out *uiout, const char *fld, unsigned int val) | |
331 | { | |
332 | ui_out_field_fmt (uiout, fld, "%u", val); | |
333 | } | |
334 | ||
335 | /* Disassemble a section of the recorded instruction trace. */ | |
336 | ||
337 | static void | |
23a7fe75 MM |
338 | btrace_insn_history (struct ui_out *uiout, |
339 | const struct btrace_insn_iterator *begin, | |
340 | const struct btrace_insn_iterator *end, int flags) | |
afedecd3 MM |
341 | { |
342 | struct gdbarch *gdbarch; | |
23a7fe75 | 343 | struct btrace_insn_iterator it; |
afedecd3 | 344 | |
23a7fe75 MM |
345 | DEBUG ("itrace (0x%x): [%u; %u)", flags, btrace_insn_number (begin), |
346 | btrace_insn_number (end)); | |
afedecd3 MM |
347 | |
348 | gdbarch = target_gdbarch (); | |
349 | ||
23a7fe75 | 350 | for (it = *begin; btrace_insn_cmp (&it, end) != 0; btrace_insn_next (&it, 1)) |
afedecd3 | 351 | { |
23a7fe75 MM |
352 | const struct btrace_insn *insn; |
353 | ||
354 | insn = btrace_insn_get (&it); | |
355 | ||
afedecd3 | 356 | /* Print the instruction index. */ |
23a7fe75 | 357 | ui_out_field_uint (uiout, "index", btrace_insn_number (&it)); |
afedecd3 MM |
358 | ui_out_text (uiout, "\t"); |
359 | ||
360 | /* Disassembly with '/m' flag may not produce the expected result. | |
361 | See PR gdb/11833. */ | |
23a7fe75 | 362 | gdb_disassembly (gdbarch, uiout, NULL, flags, 1, insn->pc, insn->pc + 1); |
afedecd3 MM |
363 | } |
364 | } | |
365 | ||
366 | /* The to_insn_history method of target record-btrace. */ | |
367 | ||
368 | static void | |
7a6c5609 | 369 | record_btrace_insn_history (struct target_ops *self, int size, int flags) |
afedecd3 MM |
370 | { |
371 | struct btrace_thread_info *btinfo; | |
23a7fe75 MM |
372 | struct btrace_insn_history *history; |
373 | struct btrace_insn_iterator begin, end; | |
afedecd3 MM |
374 | struct cleanup *uiout_cleanup; |
375 | struct ui_out *uiout; | |
23a7fe75 | 376 | unsigned int context, covered; |
afedecd3 MM |
377 | |
378 | uiout = current_uiout; | |
379 | uiout_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, | |
380 | "insn history"); | |
afedecd3 | 381 | context = abs (size); |
afedecd3 MM |
382 | if (context == 0) |
383 | error (_("Bad record instruction-history-size.")); | |
384 | ||
23a7fe75 MM |
385 | btinfo = require_btrace (); |
386 | history = btinfo->insn_history; | |
387 | if (history == NULL) | |
afedecd3 | 388 | { |
07bbe694 | 389 | struct btrace_insn_iterator *replay; |
afedecd3 | 390 | |
23a7fe75 | 391 | DEBUG ("insn-history (0x%x): %d", flags, size); |
afedecd3 | 392 | |
07bbe694 MM |
393 | /* If we're replaying, we start at the replay position. Otherwise, we |
394 | start at the tail of the trace. */ | |
395 | replay = btinfo->replay; | |
396 | if (replay != NULL) | |
397 | begin = *replay; | |
398 | else | |
399 | btrace_insn_end (&begin, btinfo); | |
400 | ||
401 | /* We start from here and expand in the requested direction. Then we | |
402 | expand in the other direction, as well, to fill up any remaining | |
403 | context. */ | |
404 | end = begin; | |
405 | if (size < 0) | |
406 | { | |
407 | /* We want the current position covered, as well. */ | |
408 | covered = btrace_insn_next (&end, 1); | |
409 | covered += btrace_insn_prev (&begin, context - covered); | |
410 | covered += btrace_insn_next (&end, context - covered); | |
411 | } | |
412 | else | |
413 | { | |
414 | covered = btrace_insn_next (&end, context); | |
415 | covered += btrace_insn_prev (&begin, context - covered); | |
416 | } | |
afedecd3 MM |
417 | } |
418 | else | |
419 | { | |
23a7fe75 MM |
420 | begin = history->begin; |
421 | end = history->end; | |
afedecd3 | 422 | |
23a7fe75 MM |
423 | DEBUG ("insn-history (0x%x): %d, prev: [%u; %u)", flags, size, |
424 | btrace_insn_number (&begin), btrace_insn_number (&end)); | |
afedecd3 | 425 | |
23a7fe75 MM |
426 | if (size < 0) |
427 | { | |
428 | end = begin; | |
429 | covered = btrace_insn_prev (&begin, context); | |
430 | } | |
431 | else | |
432 | { | |
433 | begin = end; | |
434 | covered = btrace_insn_next (&end, context); | |
435 | } | |
afedecd3 MM |
436 | } |
437 | ||
23a7fe75 MM |
438 | if (covered > 0) |
439 | btrace_insn_history (uiout, &begin, &end, flags); | |
440 | else | |
441 | { | |
442 | if (size < 0) | |
443 | printf_unfiltered (_("At the start of the branch trace record.\n")); | |
444 | else | |
445 | printf_unfiltered (_("At the end of the branch trace record.\n")); | |
446 | } | |
afedecd3 | 447 | |
23a7fe75 | 448 | btrace_set_insn_history (btinfo, &begin, &end); |
afedecd3 MM |
449 | do_cleanups (uiout_cleanup); |
450 | } | |
451 | ||
452 | /* The to_insn_history_range method of target record-btrace. */ | |
453 | ||
454 | static void | |
4e99c6b7 TT |
455 | record_btrace_insn_history_range (struct target_ops *self, |
456 | ULONGEST from, ULONGEST to, int flags) | |
afedecd3 MM |
457 | { |
458 | struct btrace_thread_info *btinfo; | |
23a7fe75 MM |
459 | struct btrace_insn_history *history; |
460 | struct btrace_insn_iterator begin, end; | |
afedecd3 MM |
461 | struct cleanup *uiout_cleanup; |
462 | struct ui_out *uiout; | |
23a7fe75 MM |
463 | unsigned int low, high; |
464 | int found; | |
afedecd3 MM |
465 | |
466 | uiout = current_uiout; | |
467 | uiout_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, | |
468 | "insn history"); | |
23a7fe75 MM |
469 | low = from; |
470 | high = to; | |
afedecd3 | 471 | |
23a7fe75 | 472 | DEBUG ("insn-history (0x%x): [%u; %u)", flags, low, high); |
afedecd3 MM |
473 | |
474 | /* Check for wrap-arounds. */ | |
23a7fe75 | 475 | if (low != from || high != to) |
afedecd3 MM |
476 | error (_("Bad range.")); |
477 | ||
0688d04e | 478 | if (high < low) |
afedecd3 MM |
479 | error (_("Bad range.")); |
480 | ||
23a7fe75 | 481 | btinfo = require_btrace (); |
afedecd3 | 482 | |
23a7fe75 MM |
483 | found = btrace_find_insn_by_number (&begin, btinfo, low); |
484 | if (found == 0) | |
485 | error (_("Range out of bounds.")); | |
afedecd3 | 486 | |
23a7fe75 MM |
487 | found = btrace_find_insn_by_number (&end, btinfo, high); |
488 | if (found == 0) | |
0688d04e MM |
489 | { |
490 | /* Silently truncate the range. */ | |
491 | btrace_insn_end (&end, btinfo); | |
492 | } | |
493 | else | |
494 | { | |
495 | /* We want both begin and end to be inclusive. */ | |
496 | btrace_insn_next (&end, 1); | |
497 | } | |
afedecd3 | 498 | |
23a7fe75 MM |
499 | btrace_insn_history (uiout, &begin, &end, flags); |
500 | btrace_set_insn_history (btinfo, &begin, &end); | |
afedecd3 MM |
501 | |
502 | do_cleanups (uiout_cleanup); | |
503 | } | |
504 | ||
505 | /* The to_insn_history_from method of target record-btrace. */ | |
506 | ||
507 | static void | |
9abc3ff3 TT |
508 | record_btrace_insn_history_from (struct target_ops *self, |
509 | ULONGEST from, int size, int flags) | |
afedecd3 MM |
510 | { |
511 | ULONGEST begin, end, context; | |
512 | ||
513 | context = abs (size); | |
0688d04e MM |
514 | if (context == 0) |
515 | error (_("Bad record instruction-history-size.")); | |
afedecd3 MM |
516 | |
517 | if (size < 0) | |
518 | { | |
519 | end = from; | |
520 | ||
521 | if (from < context) | |
522 | begin = 0; | |
523 | else | |
0688d04e | 524 | begin = from - context + 1; |
afedecd3 MM |
525 | } |
526 | else | |
527 | { | |
528 | begin = from; | |
0688d04e | 529 | end = from + context - 1; |
afedecd3 MM |
530 | |
531 | /* Check for wrap-around. */ | |
532 | if (end < begin) | |
533 | end = ULONGEST_MAX; | |
534 | } | |
535 | ||
4e99c6b7 | 536 | record_btrace_insn_history_range (self, begin, end, flags); |
afedecd3 MM |
537 | } |
538 | ||
539 | /* Print the instruction number range for a function call history line. */ | |
540 | ||
541 | static void | |
23a7fe75 MM |
542 | btrace_call_history_insn_range (struct ui_out *uiout, |
543 | const struct btrace_function *bfun) | |
afedecd3 | 544 | { |
7acbe133 MM |
545 | unsigned int begin, end, size; |
546 | ||
547 | size = VEC_length (btrace_insn_s, bfun->insn); | |
548 | gdb_assert (size > 0); | |
afedecd3 | 549 | |
23a7fe75 | 550 | begin = bfun->insn_offset; |
7acbe133 | 551 | end = begin + size - 1; |
afedecd3 | 552 | |
23a7fe75 | 553 | ui_out_field_uint (uiout, "insn begin", begin); |
8710b709 | 554 | ui_out_text (uiout, ","); |
23a7fe75 | 555 | ui_out_field_uint (uiout, "insn end", end); |
afedecd3 MM |
556 | } |
557 | ||
558 | /* Print the source line information for a function call history line. */ | |
559 | ||
560 | static void | |
23a7fe75 MM |
561 | btrace_call_history_src_line (struct ui_out *uiout, |
562 | const struct btrace_function *bfun) | |
afedecd3 MM |
563 | { |
564 | struct symbol *sym; | |
23a7fe75 | 565 | int begin, end; |
afedecd3 MM |
566 | |
567 | sym = bfun->sym; | |
568 | if (sym == NULL) | |
569 | return; | |
570 | ||
571 | ui_out_field_string (uiout, "file", | |
08be3fe3 | 572 | symtab_to_filename_for_display (symbol_symtab (sym))); |
afedecd3 | 573 | |
23a7fe75 MM |
574 | begin = bfun->lbegin; |
575 | end = bfun->lend; | |
576 | ||
577 | if (end < begin) | |
afedecd3 MM |
578 | return; |
579 | ||
580 | ui_out_text (uiout, ":"); | |
23a7fe75 | 581 | ui_out_field_int (uiout, "min line", begin); |
afedecd3 | 582 | |
23a7fe75 | 583 | if (end == begin) |
afedecd3 MM |
584 | return; |
585 | ||
8710b709 | 586 | ui_out_text (uiout, ","); |
23a7fe75 | 587 | ui_out_field_int (uiout, "max line", end); |
afedecd3 MM |
588 | } |
589 | ||
0b722aec MM |
590 | /* Get the name of a branch trace function. */ |
591 | ||
592 | static const char * | |
593 | btrace_get_bfun_name (const struct btrace_function *bfun) | |
594 | { | |
595 | struct minimal_symbol *msym; | |
596 | struct symbol *sym; | |
597 | ||
598 | if (bfun == NULL) | |
599 | return "??"; | |
600 | ||
601 | msym = bfun->msym; | |
602 | sym = bfun->sym; | |
603 | ||
604 | if (sym != NULL) | |
605 | return SYMBOL_PRINT_NAME (sym); | |
606 | else if (msym != NULL) | |
efd66ac6 | 607 | return MSYMBOL_PRINT_NAME (msym); |
0b722aec MM |
608 | else |
609 | return "??"; | |
610 | } | |
611 | ||
afedecd3 MM |
612 | /* Disassemble a section of the recorded function trace. */ |
613 | ||
614 | static void | |
23a7fe75 | 615 | btrace_call_history (struct ui_out *uiout, |
8710b709 | 616 | const struct btrace_thread_info *btinfo, |
23a7fe75 MM |
617 | const struct btrace_call_iterator *begin, |
618 | const struct btrace_call_iterator *end, | |
afedecd3 MM |
619 | enum record_print_flag flags) |
620 | { | |
23a7fe75 | 621 | struct btrace_call_iterator it; |
afedecd3 | 622 | |
23a7fe75 MM |
623 | DEBUG ("ftrace (0x%x): [%u; %u)", flags, btrace_call_number (begin), |
624 | btrace_call_number (end)); | |
afedecd3 | 625 | |
23a7fe75 | 626 | for (it = *begin; btrace_call_cmp (&it, end) < 0; btrace_call_next (&it, 1)) |
afedecd3 | 627 | { |
23a7fe75 MM |
628 | const struct btrace_function *bfun; |
629 | struct minimal_symbol *msym; | |
630 | struct symbol *sym; | |
631 | ||
632 | bfun = btrace_call_get (&it); | |
23a7fe75 | 633 | sym = bfun->sym; |
0b722aec | 634 | msym = bfun->msym; |
23a7fe75 | 635 | |
afedecd3 | 636 | /* Print the function index. */ |
23a7fe75 | 637 | ui_out_field_uint (uiout, "index", bfun->number); |
afedecd3 MM |
638 | ui_out_text (uiout, "\t"); |
639 | ||
8710b709 MM |
640 | if ((flags & RECORD_PRINT_INDENT_CALLS) != 0) |
641 | { | |
642 | int level = bfun->level + btinfo->level, i; | |
643 | ||
644 | for (i = 0; i < level; ++i) | |
645 | ui_out_text (uiout, " "); | |
646 | } | |
647 | ||
648 | if (sym != NULL) | |
649 | ui_out_field_string (uiout, "function", SYMBOL_PRINT_NAME (sym)); | |
650 | else if (msym != NULL) | |
efd66ac6 | 651 | ui_out_field_string (uiout, "function", MSYMBOL_PRINT_NAME (msym)); |
8710b709 MM |
652 | else if (!ui_out_is_mi_like_p (uiout)) |
653 | ui_out_field_string (uiout, "function", "??"); | |
654 | ||
1e038f67 | 655 | if ((flags & RECORD_PRINT_INSN_RANGE) != 0) |
afedecd3 | 656 | { |
8710b709 | 657 | ui_out_text (uiout, _("\tinst ")); |
23a7fe75 | 658 | btrace_call_history_insn_range (uiout, bfun); |
afedecd3 MM |
659 | } |
660 | ||
1e038f67 | 661 | if ((flags & RECORD_PRINT_SRC_LINE) != 0) |
afedecd3 | 662 | { |
8710b709 | 663 | ui_out_text (uiout, _("\tat ")); |
23a7fe75 | 664 | btrace_call_history_src_line (uiout, bfun); |
afedecd3 MM |
665 | } |
666 | ||
afedecd3 MM |
667 | ui_out_text (uiout, "\n"); |
668 | } | |
669 | } | |
670 | ||
671 | /* The to_call_history method of target record-btrace. */ | |
672 | ||
673 | static void | |
5df2fcba | 674 | record_btrace_call_history (struct target_ops *self, int size, int flags) |
afedecd3 MM |
675 | { |
676 | struct btrace_thread_info *btinfo; | |
23a7fe75 MM |
677 | struct btrace_call_history *history; |
678 | struct btrace_call_iterator begin, end; | |
afedecd3 MM |
679 | struct cleanup *uiout_cleanup; |
680 | struct ui_out *uiout; | |
23a7fe75 | 681 | unsigned int context, covered; |
afedecd3 MM |
682 | |
683 | uiout = current_uiout; | |
684 | uiout_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, | |
685 | "insn history"); | |
afedecd3 | 686 | context = abs (size); |
afedecd3 MM |
687 | if (context == 0) |
688 | error (_("Bad record function-call-history-size.")); | |
689 | ||
23a7fe75 MM |
690 | btinfo = require_btrace (); |
691 | history = btinfo->call_history; | |
692 | if (history == NULL) | |
afedecd3 | 693 | { |
07bbe694 | 694 | struct btrace_insn_iterator *replay; |
afedecd3 | 695 | |
23a7fe75 | 696 | DEBUG ("call-history (0x%x): %d", flags, size); |
afedecd3 | 697 | |
07bbe694 MM |
698 | /* If we're replaying, we start at the replay position. Otherwise, we |
699 | start at the tail of the trace. */ | |
700 | replay = btinfo->replay; | |
701 | if (replay != NULL) | |
702 | { | |
703 | begin.function = replay->function; | |
704 | begin.btinfo = btinfo; | |
705 | } | |
706 | else | |
707 | btrace_call_end (&begin, btinfo); | |
708 | ||
709 | /* We start from here and expand in the requested direction. Then we | |
710 | expand in the other direction, as well, to fill up any remaining | |
711 | context. */ | |
712 | end = begin; | |
713 | if (size < 0) | |
714 | { | |
715 | /* We want the current position covered, as well. */ | |
716 | covered = btrace_call_next (&end, 1); | |
717 | covered += btrace_call_prev (&begin, context - covered); | |
718 | covered += btrace_call_next (&end, context - covered); | |
719 | } | |
720 | else | |
721 | { | |
722 | covered = btrace_call_next (&end, context); | |
723 | covered += btrace_call_prev (&begin, context- covered); | |
724 | } | |
afedecd3 MM |
725 | } |
726 | else | |
727 | { | |
23a7fe75 MM |
728 | begin = history->begin; |
729 | end = history->end; | |
afedecd3 | 730 | |
23a7fe75 MM |
731 | DEBUG ("call-history (0x%x): %d, prev: [%u; %u)", flags, size, |
732 | btrace_call_number (&begin), btrace_call_number (&end)); | |
afedecd3 | 733 | |
23a7fe75 MM |
734 | if (size < 0) |
735 | { | |
736 | end = begin; | |
737 | covered = btrace_call_prev (&begin, context); | |
738 | } | |
739 | else | |
740 | { | |
741 | begin = end; | |
742 | covered = btrace_call_next (&end, context); | |
743 | } | |
afedecd3 MM |
744 | } |
745 | ||
23a7fe75 | 746 | if (covered > 0) |
8710b709 | 747 | btrace_call_history (uiout, btinfo, &begin, &end, flags); |
23a7fe75 MM |
748 | else |
749 | { | |
750 | if (size < 0) | |
751 | printf_unfiltered (_("At the start of the branch trace record.\n")); | |
752 | else | |
753 | printf_unfiltered (_("At the end of the branch trace record.\n")); | |
754 | } | |
afedecd3 | 755 | |
23a7fe75 | 756 | btrace_set_call_history (btinfo, &begin, &end); |
afedecd3 MM |
757 | do_cleanups (uiout_cleanup); |
758 | } | |
759 | ||
760 | /* The to_call_history_range method of target record-btrace. */ | |
761 | ||
762 | static void | |
f0d960ea TT |
763 | record_btrace_call_history_range (struct target_ops *self, |
764 | ULONGEST from, ULONGEST to, int flags) | |
afedecd3 MM |
765 | { |
766 | struct btrace_thread_info *btinfo; | |
23a7fe75 MM |
767 | struct btrace_call_history *history; |
768 | struct btrace_call_iterator begin, end; | |
afedecd3 MM |
769 | struct cleanup *uiout_cleanup; |
770 | struct ui_out *uiout; | |
23a7fe75 MM |
771 | unsigned int low, high; |
772 | int found; | |
afedecd3 MM |
773 | |
774 | uiout = current_uiout; | |
775 | uiout_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, | |
776 | "func history"); | |
23a7fe75 MM |
777 | low = from; |
778 | high = to; | |
afedecd3 | 779 | |
23a7fe75 | 780 | DEBUG ("call-history (0x%x): [%u; %u)", flags, low, high); |
afedecd3 MM |
781 | |
782 | /* Check for wrap-arounds. */ | |
23a7fe75 | 783 | if (low != from || high != to) |
afedecd3 MM |
784 | error (_("Bad range.")); |
785 | ||
0688d04e | 786 | if (high < low) |
afedecd3 MM |
787 | error (_("Bad range.")); |
788 | ||
23a7fe75 | 789 | btinfo = require_btrace (); |
afedecd3 | 790 | |
23a7fe75 MM |
791 | found = btrace_find_call_by_number (&begin, btinfo, low); |
792 | if (found == 0) | |
793 | error (_("Range out of bounds.")); | |
afedecd3 | 794 | |
23a7fe75 MM |
795 | found = btrace_find_call_by_number (&end, btinfo, high); |
796 | if (found == 0) | |
0688d04e MM |
797 | { |
798 | /* Silently truncate the range. */ | |
799 | btrace_call_end (&end, btinfo); | |
800 | } | |
801 | else | |
802 | { | |
803 | /* We want both begin and end to be inclusive. */ | |
804 | btrace_call_next (&end, 1); | |
805 | } | |
afedecd3 | 806 | |
8710b709 | 807 | btrace_call_history (uiout, btinfo, &begin, &end, flags); |
23a7fe75 | 808 | btrace_set_call_history (btinfo, &begin, &end); |
afedecd3 MM |
809 | |
810 | do_cleanups (uiout_cleanup); | |
811 | } | |
812 | ||
813 | /* The to_call_history_from method of target record-btrace. */ | |
814 | ||
815 | static void | |
ec0aea04 TT |
816 | record_btrace_call_history_from (struct target_ops *self, |
817 | ULONGEST from, int size, int flags) | |
afedecd3 MM |
818 | { |
819 | ULONGEST begin, end, context; | |
820 | ||
821 | context = abs (size); | |
0688d04e MM |
822 | if (context == 0) |
823 | error (_("Bad record function-call-history-size.")); | |
afedecd3 MM |
824 | |
825 | if (size < 0) | |
826 | { | |
827 | end = from; | |
828 | ||
829 | if (from < context) | |
830 | begin = 0; | |
831 | else | |
0688d04e | 832 | begin = from - context + 1; |
afedecd3 MM |
833 | } |
834 | else | |
835 | { | |
836 | begin = from; | |
0688d04e | 837 | end = from + context - 1; |
afedecd3 MM |
838 | |
839 | /* Check for wrap-around. */ | |
840 | if (end < begin) | |
841 | end = ULONGEST_MAX; | |
842 | } | |
843 | ||
f0d960ea | 844 | record_btrace_call_history_range (self, begin, end, flags); |
afedecd3 MM |
845 | } |
846 | ||
07bbe694 MM |
847 | /* The to_record_is_replaying method of target record-btrace. */ |
848 | ||
849 | static int | |
1c63c994 | 850 | record_btrace_is_replaying (struct target_ops *self) |
07bbe694 MM |
851 | { |
852 | struct thread_info *tp; | |
853 | ||
034f788c | 854 | ALL_NON_EXITED_THREADS (tp) |
07bbe694 MM |
855 | if (btrace_is_replaying (tp)) |
856 | return 1; | |
857 | ||
858 | return 0; | |
859 | } | |
860 | ||
633785ff MM |
861 | /* The to_xfer_partial method of target record-btrace. */ |
862 | ||
9b409511 | 863 | static enum target_xfer_status |
633785ff MM |
864 | record_btrace_xfer_partial (struct target_ops *ops, enum target_object object, |
865 | const char *annex, gdb_byte *readbuf, | |
866 | const gdb_byte *writebuf, ULONGEST offset, | |
9b409511 | 867 | ULONGEST len, ULONGEST *xfered_len) |
633785ff MM |
868 | { |
869 | struct target_ops *t; | |
870 | ||
871 | /* Filter out requests that don't make sense during replay. */ | |
67b5c0c1 | 872 | if (replay_memory_access == replay_memory_access_read_only |
aef92902 | 873 | && !record_btrace_generating_corefile |
67b5c0c1 | 874 | && record_btrace_is_replaying (ops)) |
633785ff MM |
875 | { |
876 | switch (object) | |
877 | { | |
878 | case TARGET_OBJECT_MEMORY: | |
879 | { | |
880 | struct target_section *section; | |
881 | ||
882 | /* We do not allow writing memory in general. */ | |
883 | if (writebuf != NULL) | |
9b409511 YQ |
884 | { |
885 | *xfered_len = len; | |
bc113b4e | 886 | return TARGET_XFER_UNAVAILABLE; |
9b409511 | 887 | } |
633785ff MM |
888 | |
889 | /* We allow reading readonly memory. */ | |
890 | section = target_section_by_addr (ops, offset); | |
891 | if (section != NULL) | |
892 | { | |
893 | /* Check if the section we found is readonly. */ | |
894 | if ((bfd_get_section_flags (section->the_bfd_section->owner, | |
895 | section->the_bfd_section) | |
896 | & SEC_READONLY) != 0) | |
897 | { | |
898 | /* Truncate the request to fit into this section. */ | |
899 | len = min (len, section->endaddr - offset); | |
900 | break; | |
901 | } | |
902 | } | |
903 | ||
9b409511 | 904 | *xfered_len = len; |
bc113b4e | 905 | return TARGET_XFER_UNAVAILABLE; |
633785ff MM |
906 | } |
907 | } | |
908 | } | |
909 | ||
910 | /* Forward the request. */ | |
e75fdfca TT |
911 | ops = ops->beneath; |
912 | return ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, | |
913 | offset, len, xfered_len); | |
633785ff MM |
914 | } |
915 | ||
916 | /* The to_insert_breakpoint method of target record-btrace. */ | |
917 | ||
918 | static int | |
919 | record_btrace_insert_breakpoint (struct target_ops *ops, | |
920 | struct gdbarch *gdbarch, | |
921 | struct bp_target_info *bp_tgt) | |
922 | { | |
923 | volatile struct gdb_exception except; | |
67b5c0c1 MM |
924 | const char *old; |
925 | int ret; | |
633785ff MM |
926 | |
927 | /* Inserting breakpoints requires accessing memory. Allow it for the | |
928 | duration of this function. */ | |
67b5c0c1 MM |
929 | old = replay_memory_access; |
930 | replay_memory_access = replay_memory_access_read_write; | |
633785ff MM |
931 | |
932 | ret = 0; | |
933 | TRY_CATCH (except, RETURN_MASK_ALL) | |
6b84065d | 934 | ret = ops->beneath->to_insert_breakpoint (ops->beneath, gdbarch, bp_tgt); |
633785ff | 935 | |
67b5c0c1 | 936 | replay_memory_access = old; |
633785ff MM |
937 | |
938 | if (except.reason < 0) | |
939 | throw_exception (except); | |
940 | ||
941 | return ret; | |
942 | } | |
943 | ||
944 | /* The to_remove_breakpoint method of target record-btrace. */ | |
945 | ||
946 | static int | |
947 | record_btrace_remove_breakpoint (struct target_ops *ops, | |
948 | struct gdbarch *gdbarch, | |
949 | struct bp_target_info *bp_tgt) | |
950 | { | |
951 | volatile struct gdb_exception except; | |
67b5c0c1 MM |
952 | const char *old; |
953 | int ret; | |
633785ff MM |
954 | |
955 | /* Removing breakpoints requires accessing memory. Allow it for the | |
956 | duration of this function. */ | |
67b5c0c1 MM |
957 | old = replay_memory_access; |
958 | replay_memory_access = replay_memory_access_read_write; | |
633785ff MM |
959 | |
960 | ret = 0; | |
961 | TRY_CATCH (except, RETURN_MASK_ALL) | |
6b84065d | 962 | ret = ops->beneath->to_remove_breakpoint (ops->beneath, gdbarch, bp_tgt); |
633785ff | 963 | |
67b5c0c1 | 964 | replay_memory_access = old; |
633785ff MM |
965 | |
966 | if (except.reason < 0) | |
967 | throw_exception (except); | |
968 | ||
969 | return ret; | |
970 | } | |
971 | ||
1f3ef581 MM |
972 | /* The to_fetch_registers method of target record-btrace. */ |
973 | ||
974 | static void | |
975 | record_btrace_fetch_registers (struct target_ops *ops, | |
976 | struct regcache *regcache, int regno) | |
977 | { | |
978 | struct btrace_insn_iterator *replay; | |
979 | struct thread_info *tp; | |
980 | ||
981 | tp = find_thread_ptid (inferior_ptid); | |
982 | gdb_assert (tp != NULL); | |
983 | ||
984 | replay = tp->btrace.replay; | |
aef92902 | 985 | if (replay != NULL && !record_btrace_generating_corefile) |
1f3ef581 MM |
986 | { |
987 | const struct btrace_insn *insn; | |
988 | struct gdbarch *gdbarch; | |
989 | int pcreg; | |
990 | ||
991 | gdbarch = get_regcache_arch (regcache); | |
992 | pcreg = gdbarch_pc_regnum (gdbarch); | |
993 | if (pcreg < 0) | |
994 | return; | |
995 | ||
996 | /* We can only provide the PC register. */ | |
997 | if (regno >= 0 && regno != pcreg) | |
998 | return; | |
999 | ||
1000 | insn = btrace_insn_get (replay); | |
1001 | gdb_assert (insn != NULL); | |
1002 | ||
1003 | regcache_raw_supply (regcache, regno, &insn->pc); | |
1004 | } | |
1005 | else | |
1006 | { | |
e75fdfca | 1007 | struct target_ops *t = ops->beneath; |
1f3ef581 | 1008 | |
e75fdfca | 1009 | t->to_fetch_registers (t, regcache, regno); |
1f3ef581 MM |
1010 | } |
1011 | } | |
1012 | ||
1013 | /* The to_store_registers method of target record-btrace. */ | |
1014 | ||
1015 | static void | |
1016 | record_btrace_store_registers (struct target_ops *ops, | |
1017 | struct regcache *regcache, int regno) | |
1018 | { | |
1019 | struct target_ops *t; | |
1020 | ||
aef92902 | 1021 | if (!record_btrace_generating_corefile && record_btrace_is_replaying (ops)) |
1f3ef581 MM |
1022 | error (_("This record target does not allow writing registers.")); |
1023 | ||
1024 | gdb_assert (may_write_registers != 0); | |
1025 | ||
e75fdfca TT |
1026 | t = ops->beneath; |
1027 | t->to_store_registers (t, regcache, regno); | |
1f3ef581 MM |
1028 | } |
1029 | ||
1030 | /* The to_prepare_to_store method of target record-btrace. */ | |
1031 | ||
1032 | static void | |
1033 | record_btrace_prepare_to_store (struct target_ops *ops, | |
1034 | struct regcache *regcache) | |
1035 | { | |
1036 | struct target_ops *t; | |
1037 | ||
aef92902 | 1038 | if (!record_btrace_generating_corefile && record_btrace_is_replaying (ops)) |
1f3ef581 MM |
1039 | return; |
1040 | ||
e75fdfca TT |
1041 | t = ops->beneath; |
1042 | t->to_prepare_to_store (t, regcache); | |
1f3ef581 MM |
1043 | } |
1044 | ||
0b722aec MM |
1045 | /* The branch trace frame cache. */ |
1046 | ||
1047 | struct btrace_frame_cache | |
1048 | { | |
1049 | /* The thread. */ | |
1050 | struct thread_info *tp; | |
1051 | ||
1052 | /* The frame info. */ | |
1053 | struct frame_info *frame; | |
1054 | ||
1055 | /* The branch trace function segment. */ | |
1056 | const struct btrace_function *bfun; | |
1057 | }; | |
1058 | ||
1059 | /* A struct btrace_frame_cache hash table indexed by NEXT. */ | |
1060 | ||
1061 | static htab_t bfcache; | |
1062 | ||
1063 | /* hash_f for htab_create_alloc of bfcache. */ | |
1064 | ||
1065 | static hashval_t | |
1066 | bfcache_hash (const void *arg) | |
1067 | { | |
1068 | const struct btrace_frame_cache *cache = arg; | |
1069 | ||
1070 | return htab_hash_pointer (cache->frame); | |
1071 | } | |
1072 | ||
1073 | /* eq_f for htab_create_alloc of bfcache. */ | |
1074 | ||
1075 | static int | |
1076 | bfcache_eq (const void *arg1, const void *arg2) | |
1077 | { | |
1078 | const struct btrace_frame_cache *cache1 = arg1; | |
1079 | const struct btrace_frame_cache *cache2 = arg2; | |
1080 | ||
1081 | return cache1->frame == cache2->frame; | |
1082 | } | |
1083 | ||
1084 | /* Create a new btrace frame cache. */ | |
1085 | ||
1086 | static struct btrace_frame_cache * | |
1087 | bfcache_new (struct frame_info *frame) | |
1088 | { | |
1089 | struct btrace_frame_cache *cache; | |
1090 | void **slot; | |
1091 | ||
1092 | cache = FRAME_OBSTACK_ZALLOC (struct btrace_frame_cache); | |
1093 | cache->frame = frame; | |
1094 | ||
1095 | slot = htab_find_slot (bfcache, cache, INSERT); | |
1096 | gdb_assert (*slot == NULL); | |
1097 | *slot = cache; | |
1098 | ||
1099 | return cache; | |
1100 | } | |
1101 | ||
1102 | /* Extract the branch trace function from a branch trace frame. */ | |
1103 | ||
1104 | static const struct btrace_function * | |
1105 | btrace_get_frame_function (struct frame_info *frame) | |
1106 | { | |
1107 | const struct btrace_frame_cache *cache; | |
1108 | const struct btrace_function *bfun; | |
1109 | struct btrace_frame_cache pattern; | |
1110 | void **slot; | |
1111 | ||
1112 | pattern.frame = frame; | |
1113 | ||
1114 | slot = htab_find_slot (bfcache, &pattern, NO_INSERT); | |
1115 | if (slot == NULL) | |
1116 | return NULL; | |
1117 | ||
1118 | cache = *slot; | |
1119 | return cache->bfun; | |
1120 | } | |
1121 | ||
cecac1ab MM |
1122 | /* Implement stop_reason method for record_btrace_frame_unwind. */ |
1123 | ||
1124 | static enum unwind_stop_reason | |
1125 | record_btrace_frame_unwind_stop_reason (struct frame_info *this_frame, | |
1126 | void **this_cache) | |
1127 | { | |
0b722aec MM |
1128 | const struct btrace_frame_cache *cache; |
1129 | const struct btrace_function *bfun; | |
1130 | ||
1131 | cache = *this_cache; | |
1132 | bfun = cache->bfun; | |
1133 | gdb_assert (bfun != NULL); | |
1134 | ||
1135 | if (bfun->up == NULL) | |
1136 | return UNWIND_UNAVAILABLE; | |
1137 | ||
1138 | return UNWIND_NO_REASON; | |
cecac1ab MM |
1139 | } |
1140 | ||
1141 | /* Implement this_id method for record_btrace_frame_unwind. */ | |
1142 | ||
1143 | static void | |
1144 | record_btrace_frame_this_id (struct frame_info *this_frame, void **this_cache, | |
1145 | struct frame_id *this_id) | |
1146 | { | |
0b722aec MM |
1147 | const struct btrace_frame_cache *cache; |
1148 | const struct btrace_function *bfun; | |
1149 | CORE_ADDR code, special; | |
1150 | ||
1151 | cache = *this_cache; | |
1152 | ||
1153 | bfun = cache->bfun; | |
1154 | gdb_assert (bfun != NULL); | |
1155 | ||
1156 | while (bfun->segment.prev != NULL) | |
1157 | bfun = bfun->segment.prev; | |
1158 | ||
1159 | code = get_frame_func (this_frame); | |
1160 | special = bfun->number; | |
1161 | ||
1162 | *this_id = frame_id_build_unavailable_stack_special (code, special); | |
1163 | ||
1164 | DEBUG ("[frame] %s id: (!stack, pc=%s, special=%s)", | |
1165 | btrace_get_bfun_name (cache->bfun), | |
1166 | core_addr_to_string_nz (this_id->code_addr), | |
1167 | core_addr_to_string_nz (this_id->special_addr)); | |
cecac1ab MM |
1168 | } |
1169 | ||
1170 | /* Implement prev_register method for record_btrace_frame_unwind. */ | |
1171 | ||
1172 | static struct value * | |
1173 | record_btrace_frame_prev_register (struct frame_info *this_frame, | |
1174 | void **this_cache, | |
1175 | int regnum) | |
1176 | { | |
0b722aec MM |
1177 | const struct btrace_frame_cache *cache; |
1178 | const struct btrace_function *bfun, *caller; | |
1179 | const struct btrace_insn *insn; | |
1180 | struct gdbarch *gdbarch; | |
1181 | CORE_ADDR pc; | |
1182 | int pcreg; | |
1183 | ||
1184 | gdbarch = get_frame_arch (this_frame); | |
1185 | pcreg = gdbarch_pc_regnum (gdbarch); | |
1186 | if (pcreg < 0 || regnum != pcreg) | |
1187 | throw_error (NOT_AVAILABLE_ERROR, | |
1188 | _("Registers are not available in btrace record history")); | |
1189 | ||
1190 | cache = *this_cache; | |
1191 | bfun = cache->bfun; | |
1192 | gdb_assert (bfun != NULL); | |
1193 | ||
1194 | caller = bfun->up; | |
1195 | if (caller == NULL) | |
1196 | throw_error (NOT_AVAILABLE_ERROR, | |
1197 | _("No caller in btrace record history")); | |
1198 | ||
1199 | if ((bfun->flags & BFUN_UP_LINKS_TO_RET) != 0) | |
1200 | { | |
1201 | insn = VEC_index (btrace_insn_s, caller->insn, 0); | |
1202 | pc = insn->pc; | |
1203 | } | |
1204 | else | |
1205 | { | |
1206 | insn = VEC_last (btrace_insn_s, caller->insn); | |
1207 | pc = insn->pc; | |
1208 | ||
1209 | pc += gdb_insn_length (gdbarch, pc); | |
1210 | } | |
1211 | ||
1212 | DEBUG ("[frame] unwound PC in %s on level %d: %s", | |
1213 | btrace_get_bfun_name (bfun), bfun->level, | |
1214 | core_addr_to_string_nz (pc)); | |
1215 | ||
1216 | return frame_unwind_got_address (this_frame, regnum, pc); | |
cecac1ab MM |
1217 | } |
1218 | ||
1219 | /* Implement sniffer method for record_btrace_frame_unwind. */ | |
1220 | ||
1221 | static int | |
1222 | record_btrace_frame_sniffer (const struct frame_unwind *self, | |
1223 | struct frame_info *this_frame, | |
1224 | void **this_cache) | |
1225 | { | |
0b722aec MM |
1226 | const struct btrace_function *bfun; |
1227 | struct btrace_frame_cache *cache; | |
cecac1ab | 1228 | struct thread_info *tp; |
0b722aec | 1229 | struct frame_info *next; |
cecac1ab MM |
1230 | |
1231 | /* THIS_FRAME does not contain a reference to its thread. */ | |
1232 | tp = find_thread_ptid (inferior_ptid); | |
1233 | gdb_assert (tp != NULL); | |
1234 | ||
0b722aec MM |
1235 | bfun = NULL; |
1236 | next = get_next_frame (this_frame); | |
1237 | if (next == NULL) | |
1238 | { | |
1239 | const struct btrace_insn_iterator *replay; | |
1240 | ||
1241 | replay = tp->btrace.replay; | |
1242 | if (replay != NULL) | |
1243 | bfun = replay->function; | |
1244 | } | |
1245 | else | |
1246 | { | |
1247 | const struct btrace_function *callee; | |
1248 | ||
1249 | callee = btrace_get_frame_function (next); | |
1250 | if (callee != NULL && (callee->flags & BFUN_UP_LINKS_TO_TAILCALL) == 0) | |
1251 | bfun = callee->up; | |
1252 | } | |
1253 | ||
1254 | if (bfun == NULL) | |
1255 | return 0; | |
1256 | ||
1257 | DEBUG ("[frame] sniffed frame for %s on level %d", | |
1258 | btrace_get_bfun_name (bfun), bfun->level); | |
1259 | ||
1260 | /* This is our frame. Initialize the frame cache. */ | |
1261 | cache = bfcache_new (this_frame); | |
1262 | cache->tp = tp; | |
1263 | cache->bfun = bfun; | |
1264 | ||
1265 | *this_cache = cache; | |
1266 | return 1; | |
1267 | } | |
1268 | ||
1269 | /* Implement sniffer method for record_btrace_tailcall_frame_unwind. */ | |
1270 | ||
1271 | static int | |
1272 | record_btrace_tailcall_frame_sniffer (const struct frame_unwind *self, | |
1273 | struct frame_info *this_frame, | |
1274 | void **this_cache) | |
1275 | { | |
1276 | const struct btrace_function *bfun, *callee; | |
1277 | struct btrace_frame_cache *cache; | |
1278 | struct frame_info *next; | |
1279 | ||
1280 | next = get_next_frame (this_frame); | |
1281 | if (next == NULL) | |
1282 | return 0; | |
1283 | ||
1284 | callee = btrace_get_frame_function (next); | |
1285 | if (callee == NULL) | |
1286 | return 0; | |
1287 | ||
1288 | if ((callee->flags & BFUN_UP_LINKS_TO_TAILCALL) == 0) | |
1289 | return 0; | |
1290 | ||
1291 | bfun = callee->up; | |
1292 | if (bfun == NULL) | |
1293 | return 0; | |
1294 | ||
1295 | DEBUG ("[frame] sniffed tailcall frame for %s on level %d", | |
1296 | btrace_get_bfun_name (bfun), bfun->level); | |
1297 | ||
1298 | /* This is our frame. Initialize the frame cache. */ | |
1299 | cache = bfcache_new (this_frame); | |
1300 | cache->tp = find_thread_ptid (inferior_ptid); | |
1301 | cache->bfun = bfun; | |
1302 | ||
1303 | *this_cache = cache; | |
1304 | return 1; | |
1305 | } | |
1306 | ||
1307 | static void | |
1308 | record_btrace_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
1309 | { | |
1310 | struct btrace_frame_cache *cache; | |
1311 | void **slot; | |
1312 | ||
1313 | cache = this_cache; | |
1314 | ||
1315 | slot = htab_find_slot (bfcache, cache, NO_INSERT); | |
1316 | gdb_assert (slot != NULL); | |
1317 | ||
1318 | htab_remove_elt (bfcache, cache); | |
cecac1ab MM |
1319 | } |
1320 | ||
1321 | /* btrace recording does not store previous memory content, neither the stack | |
1322 | frames content. Any unwinding would return errorneous results as the stack | |
1323 | contents no longer matches the changed PC value restored from history. | |
1324 | Therefore this unwinder reports any possibly unwound registers as | |
1325 | <unavailable>. */ | |
1326 | ||
0b722aec | 1327 | const struct frame_unwind record_btrace_frame_unwind = |
cecac1ab MM |
1328 | { |
1329 | NORMAL_FRAME, | |
1330 | record_btrace_frame_unwind_stop_reason, | |
1331 | record_btrace_frame_this_id, | |
1332 | record_btrace_frame_prev_register, | |
1333 | NULL, | |
0b722aec MM |
1334 | record_btrace_frame_sniffer, |
1335 | record_btrace_frame_dealloc_cache | |
1336 | }; | |
1337 | ||
1338 | const struct frame_unwind record_btrace_tailcall_frame_unwind = | |
1339 | { | |
1340 | TAILCALL_FRAME, | |
1341 | record_btrace_frame_unwind_stop_reason, | |
1342 | record_btrace_frame_this_id, | |
1343 | record_btrace_frame_prev_register, | |
1344 | NULL, | |
1345 | record_btrace_tailcall_frame_sniffer, | |
1346 | record_btrace_frame_dealloc_cache | |
cecac1ab | 1347 | }; |
b2f4cfde | 1348 | |
ac01945b TT |
1349 | /* Implement the to_get_unwinder method. */ |
1350 | ||
1351 | static const struct frame_unwind * | |
1352 | record_btrace_to_get_unwinder (struct target_ops *self) | |
1353 | { | |
1354 | return &record_btrace_frame_unwind; | |
1355 | } | |
1356 | ||
1357 | /* Implement the to_get_tailcall_unwinder method. */ | |
1358 | ||
1359 | static const struct frame_unwind * | |
1360 | record_btrace_to_get_tailcall_unwinder (struct target_ops *self) | |
1361 | { | |
1362 | return &record_btrace_tailcall_frame_unwind; | |
1363 | } | |
1364 | ||
52834460 MM |
1365 | /* Indicate that TP should be resumed according to FLAG. */ |
1366 | ||
1367 | static void | |
1368 | record_btrace_resume_thread (struct thread_info *tp, | |
1369 | enum btrace_thread_flag flag) | |
1370 | { | |
1371 | struct btrace_thread_info *btinfo; | |
1372 | ||
1373 | DEBUG ("resuming %d (%s): %u", tp->num, target_pid_to_str (tp->ptid), flag); | |
1374 | ||
1375 | btinfo = &tp->btrace; | |
1376 | ||
1377 | if ((btinfo->flags & BTHR_MOVE) != 0) | |
1378 | error (_("Thread already moving.")); | |
1379 | ||
1380 | /* Fetch the latest branch trace. */ | |
1381 | btrace_fetch (tp); | |
1382 | ||
1383 | btinfo->flags |= flag; | |
1384 | } | |
1385 | ||
1386 | /* Find the thread to resume given a PTID. */ | |
1387 | ||
1388 | static struct thread_info * | |
1389 | record_btrace_find_resume_thread (ptid_t ptid) | |
1390 | { | |
1391 | struct thread_info *tp; | |
1392 | ||
1393 | /* When asked to resume everything, we pick the current thread. */ | |
1394 | if (ptid_equal (minus_one_ptid, ptid) || ptid_is_pid (ptid)) | |
1395 | ptid = inferior_ptid; | |
1396 | ||
1397 | return find_thread_ptid (ptid); | |
1398 | } | |
1399 | ||
1400 | /* Start replaying a thread. */ | |
1401 | ||
1402 | static struct btrace_insn_iterator * | |
1403 | record_btrace_start_replaying (struct thread_info *tp) | |
1404 | { | |
1405 | volatile struct gdb_exception except; | |
1406 | struct btrace_insn_iterator *replay; | |
1407 | struct btrace_thread_info *btinfo; | |
1408 | int executing; | |
1409 | ||
1410 | btinfo = &tp->btrace; | |
1411 | replay = NULL; | |
1412 | ||
1413 | /* We can't start replaying without trace. */ | |
1414 | if (btinfo->begin == NULL) | |
1415 | return NULL; | |
1416 | ||
1417 | /* Clear the executing flag to allow changes to the current frame. | |
1418 | We are not actually running, yet. We just started a reverse execution | |
1419 | command or a record goto command. | |
1420 | For the latter, EXECUTING is false and this has no effect. | |
1421 | For the former, EXECUTING is true and we're in to_wait, about to | |
1422 | move the thread. Since we need to recompute the stack, we temporarily | |
1423 | set EXECUTING to flase. */ | |
1424 | executing = is_executing (tp->ptid); | |
1425 | set_executing (tp->ptid, 0); | |
1426 | ||
1427 | /* GDB stores the current frame_id when stepping in order to detects steps | |
1428 | into subroutines. | |
1429 | Since frames are computed differently when we're replaying, we need to | |
1430 | recompute those stored frames and fix them up so we can still detect | |
1431 | subroutines after we started replaying. */ | |
1432 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1433 | { | |
1434 | struct frame_info *frame; | |
1435 | struct frame_id frame_id; | |
1436 | int upd_step_frame_id, upd_step_stack_frame_id; | |
1437 | ||
1438 | /* The current frame without replaying - computed via normal unwind. */ | |
1439 | frame = get_current_frame (); | |
1440 | frame_id = get_frame_id (frame); | |
1441 | ||
1442 | /* Check if we need to update any stepping-related frame id's. */ | |
1443 | upd_step_frame_id = frame_id_eq (frame_id, | |
1444 | tp->control.step_frame_id); | |
1445 | upd_step_stack_frame_id = frame_id_eq (frame_id, | |
1446 | tp->control.step_stack_frame_id); | |
1447 | ||
1448 | /* We start replaying at the end of the branch trace. This corresponds | |
1449 | to the current instruction. */ | |
1450 | replay = xmalloc (sizeof (*replay)); | |
1451 | btrace_insn_end (replay, btinfo); | |
1452 | ||
1453 | /* We're not replaying, yet. */ | |
1454 | gdb_assert (btinfo->replay == NULL); | |
1455 | btinfo->replay = replay; | |
1456 | ||
1457 | /* Make sure we're not using any stale registers. */ | |
1458 | registers_changed_ptid (tp->ptid); | |
1459 | ||
1460 | /* The current frame with replaying - computed via btrace unwind. */ | |
1461 | frame = get_current_frame (); | |
1462 | frame_id = get_frame_id (frame); | |
1463 | ||
1464 | /* Replace stepping related frames where necessary. */ | |
1465 | if (upd_step_frame_id) | |
1466 | tp->control.step_frame_id = frame_id; | |
1467 | if (upd_step_stack_frame_id) | |
1468 | tp->control.step_stack_frame_id = frame_id; | |
1469 | } | |
1470 | ||
1471 | /* Restore the previous execution state. */ | |
1472 | set_executing (tp->ptid, executing); | |
1473 | ||
1474 | if (except.reason < 0) | |
1475 | { | |
1476 | xfree (btinfo->replay); | |
1477 | btinfo->replay = NULL; | |
1478 | ||
1479 | registers_changed_ptid (tp->ptid); | |
1480 | ||
1481 | throw_exception (except); | |
1482 | } | |
1483 | ||
1484 | return replay; | |
1485 | } | |
1486 | ||
1487 | /* Stop replaying a thread. */ | |
1488 | ||
1489 | static void | |
1490 | record_btrace_stop_replaying (struct thread_info *tp) | |
1491 | { | |
1492 | struct btrace_thread_info *btinfo; | |
1493 | ||
1494 | btinfo = &tp->btrace; | |
1495 | ||
1496 | xfree (btinfo->replay); | |
1497 | btinfo->replay = NULL; | |
1498 | ||
1499 | /* Make sure we're not leaving any stale registers. */ | |
1500 | registers_changed_ptid (tp->ptid); | |
1501 | } | |
1502 | ||
b2f4cfde MM |
1503 | /* The to_resume method of target record-btrace. */ |
1504 | ||
1505 | static void | |
1506 | record_btrace_resume (struct target_ops *ops, ptid_t ptid, int step, | |
1507 | enum gdb_signal signal) | |
1508 | { | |
52834460 MM |
1509 | struct thread_info *tp, *other; |
1510 | enum btrace_thread_flag flag; | |
1511 | ||
1512 | DEBUG ("resume %s: %s", target_pid_to_str (ptid), step ? "step" : "cont"); | |
1513 | ||
70ad5bff MM |
1514 | /* Store the execution direction of the last resume. */ |
1515 | record_btrace_resume_exec_dir = execution_direction; | |
1516 | ||
52834460 MM |
1517 | tp = record_btrace_find_resume_thread (ptid); |
1518 | if (tp == NULL) | |
1519 | error (_("Cannot find thread to resume.")); | |
1520 | ||
1521 | /* Stop replaying other threads if the thread to resume is not replaying. */ | |
1522 | if (!btrace_is_replaying (tp) && execution_direction != EXEC_REVERSE) | |
034f788c | 1523 | ALL_NON_EXITED_THREADS (other) |
52834460 MM |
1524 | record_btrace_stop_replaying (other); |
1525 | ||
b2f4cfde | 1526 | /* As long as we're not replaying, just forward the request. */ |
1c63c994 | 1527 | if (!record_btrace_is_replaying (ops) && execution_direction != EXEC_REVERSE) |
b2f4cfde | 1528 | { |
e75fdfca TT |
1529 | ops = ops->beneath; |
1530 | return ops->to_resume (ops, ptid, step, signal); | |
b2f4cfde MM |
1531 | } |
1532 | ||
52834460 MM |
1533 | /* Compute the btrace thread flag for the requested move. */ |
1534 | if (step == 0) | |
1535 | flag = execution_direction == EXEC_REVERSE ? BTHR_RCONT : BTHR_CONT; | |
1536 | else | |
1537 | flag = execution_direction == EXEC_REVERSE ? BTHR_RSTEP : BTHR_STEP; | |
1538 | ||
1539 | /* At the moment, we only move a single thread. We could also move | |
1540 | all threads in parallel by single-stepping each resumed thread | |
1541 | until the first runs into an event. | |
1542 | When we do that, we would want to continue all other threads. | |
1543 | For now, just resume one thread to not confuse to_wait. */ | |
1544 | record_btrace_resume_thread (tp, flag); | |
1545 | ||
1546 | /* We just indicate the resume intent here. The actual stepping happens in | |
1547 | record_btrace_wait below. */ | |
70ad5bff MM |
1548 | |
1549 | /* Async support. */ | |
1550 | if (target_can_async_p ()) | |
1551 | { | |
1552 | target_async (inferior_event_handler, 0); | |
1553 | mark_async_event_handler (record_btrace_async_inferior_event_handler); | |
1554 | } | |
52834460 MM |
1555 | } |
1556 | ||
1557 | /* Find a thread to move. */ | |
1558 | ||
1559 | static struct thread_info * | |
1560 | record_btrace_find_thread_to_move (ptid_t ptid) | |
1561 | { | |
1562 | struct thread_info *tp; | |
1563 | ||
1564 | /* First check the parameter thread. */ | |
1565 | tp = find_thread_ptid (ptid); | |
1566 | if (tp != NULL && (tp->btrace.flags & BTHR_MOVE) != 0) | |
1567 | return tp; | |
1568 | ||
1569 | /* Otherwise, find one other thread that has been resumed. */ | |
034f788c | 1570 | ALL_NON_EXITED_THREADS (tp) |
52834460 MM |
1571 | if ((tp->btrace.flags & BTHR_MOVE) != 0) |
1572 | return tp; | |
1573 | ||
1574 | return NULL; | |
1575 | } | |
1576 | ||
1577 | /* Return a target_waitstatus indicating that we ran out of history. */ | |
1578 | ||
1579 | static struct target_waitstatus | |
1580 | btrace_step_no_history (void) | |
1581 | { | |
1582 | struct target_waitstatus status; | |
1583 | ||
1584 | status.kind = TARGET_WAITKIND_NO_HISTORY; | |
1585 | ||
1586 | return status; | |
1587 | } | |
1588 | ||
1589 | /* Return a target_waitstatus indicating that a step finished. */ | |
1590 | ||
1591 | static struct target_waitstatus | |
1592 | btrace_step_stopped (void) | |
1593 | { | |
1594 | struct target_waitstatus status; | |
1595 | ||
1596 | status.kind = TARGET_WAITKIND_STOPPED; | |
1597 | status.value.sig = GDB_SIGNAL_TRAP; | |
1598 | ||
1599 | return status; | |
1600 | } | |
1601 | ||
1602 | /* Clear the record histories. */ | |
1603 | ||
1604 | static void | |
1605 | record_btrace_clear_histories (struct btrace_thread_info *btinfo) | |
1606 | { | |
1607 | xfree (btinfo->insn_history); | |
1608 | xfree (btinfo->call_history); | |
1609 | ||
1610 | btinfo->insn_history = NULL; | |
1611 | btinfo->call_history = NULL; | |
1612 | } | |
1613 | ||
1614 | /* Step a single thread. */ | |
1615 | ||
1616 | static struct target_waitstatus | |
1617 | record_btrace_step_thread (struct thread_info *tp) | |
1618 | { | |
1619 | struct btrace_insn_iterator *replay, end; | |
1620 | struct btrace_thread_info *btinfo; | |
1621 | struct address_space *aspace; | |
1622 | struct inferior *inf; | |
1623 | enum btrace_thread_flag flags; | |
1624 | unsigned int steps; | |
1625 | ||
e59fa00f MM |
1626 | /* We can't step without an execution history. */ |
1627 | if (btrace_is_empty (tp)) | |
1628 | return btrace_step_no_history (); | |
1629 | ||
52834460 MM |
1630 | btinfo = &tp->btrace; |
1631 | replay = btinfo->replay; | |
1632 | ||
1633 | flags = btinfo->flags & BTHR_MOVE; | |
1634 | btinfo->flags &= ~BTHR_MOVE; | |
1635 | ||
1636 | DEBUG ("stepping %d (%s): %u", tp->num, target_pid_to_str (tp->ptid), flags); | |
1637 | ||
1638 | switch (flags) | |
1639 | { | |
1640 | default: | |
1641 | internal_error (__FILE__, __LINE__, _("invalid stepping type.")); | |
1642 | ||
1643 | case BTHR_STEP: | |
1644 | /* We're done if we're not replaying. */ | |
1645 | if (replay == NULL) | |
1646 | return btrace_step_no_history (); | |
1647 | ||
1648 | /* We are always able to step at least once. */ | |
1649 | steps = btrace_insn_next (replay, 1); | |
1650 | gdb_assert (steps == 1); | |
1651 | ||
1652 | /* Determine the end of the instruction trace. */ | |
1653 | btrace_insn_end (&end, btinfo); | |
1654 | ||
1655 | /* We stop replaying if we reached the end of the trace. */ | |
1656 | if (btrace_insn_cmp (replay, &end) == 0) | |
1657 | record_btrace_stop_replaying (tp); | |
1658 | ||
1659 | return btrace_step_stopped (); | |
1660 | ||
1661 | case BTHR_RSTEP: | |
1662 | /* Start replaying if we're not already doing so. */ | |
1663 | if (replay == NULL) | |
1664 | replay = record_btrace_start_replaying (tp); | |
1665 | ||
1666 | /* If we can't step any further, we reached the end of the history. */ | |
1667 | steps = btrace_insn_prev (replay, 1); | |
1668 | if (steps == 0) | |
1669 | return btrace_step_no_history (); | |
1670 | ||
1671 | return btrace_step_stopped (); | |
1672 | ||
1673 | case BTHR_CONT: | |
1674 | /* We're done if we're not replaying. */ | |
1675 | if (replay == NULL) | |
1676 | return btrace_step_no_history (); | |
1677 | ||
c9657e70 | 1678 | inf = find_inferior_ptid (tp->ptid); |
52834460 MM |
1679 | aspace = inf->aspace; |
1680 | ||
1681 | /* Determine the end of the instruction trace. */ | |
1682 | btrace_insn_end (&end, btinfo); | |
1683 | ||
1684 | for (;;) | |
1685 | { | |
1686 | const struct btrace_insn *insn; | |
1687 | ||
1688 | /* We are always able to step at least once. */ | |
1689 | steps = btrace_insn_next (replay, 1); | |
1690 | gdb_assert (steps == 1); | |
1691 | ||
1692 | /* We stop replaying if we reached the end of the trace. */ | |
1693 | if (btrace_insn_cmp (replay, &end) == 0) | |
1694 | { | |
1695 | record_btrace_stop_replaying (tp); | |
1696 | return btrace_step_no_history (); | |
1697 | } | |
1698 | ||
1699 | insn = btrace_insn_get (replay); | |
1700 | gdb_assert (insn); | |
1701 | ||
1702 | DEBUG ("stepping %d (%s) ... %s", tp->num, | |
1703 | target_pid_to_str (tp->ptid), | |
1704 | core_addr_to_string_nz (insn->pc)); | |
1705 | ||
1706 | if (breakpoint_here_p (aspace, insn->pc)) | |
1707 | return btrace_step_stopped (); | |
1708 | } | |
1709 | ||
1710 | case BTHR_RCONT: | |
1711 | /* Start replaying if we're not already doing so. */ | |
1712 | if (replay == NULL) | |
1713 | replay = record_btrace_start_replaying (tp); | |
1714 | ||
c9657e70 | 1715 | inf = find_inferior_ptid (tp->ptid); |
52834460 MM |
1716 | aspace = inf->aspace; |
1717 | ||
1718 | for (;;) | |
1719 | { | |
1720 | const struct btrace_insn *insn; | |
1721 | ||
1722 | /* If we can't step any further, we're done. */ | |
1723 | steps = btrace_insn_prev (replay, 1); | |
1724 | if (steps == 0) | |
1725 | return btrace_step_no_history (); | |
1726 | ||
1727 | insn = btrace_insn_get (replay); | |
1728 | gdb_assert (insn); | |
1729 | ||
1730 | DEBUG ("reverse-stepping %d (%s) ... %s", tp->num, | |
1731 | target_pid_to_str (tp->ptid), | |
1732 | core_addr_to_string_nz (insn->pc)); | |
1733 | ||
1734 | if (breakpoint_here_p (aspace, insn->pc)) | |
1735 | return btrace_step_stopped (); | |
1736 | } | |
1737 | } | |
b2f4cfde MM |
1738 | } |
1739 | ||
1740 | /* The to_wait method of target record-btrace. */ | |
1741 | ||
1742 | static ptid_t | |
1743 | record_btrace_wait (struct target_ops *ops, ptid_t ptid, | |
1744 | struct target_waitstatus *status, int options) | |
1745 | { | |
52834460 MM |
1746 | struct thread_info *tp, *other; |
1747 | ||
1748 | DEBUG ("wait %s (0x%x)", target_pid_to_str (ptid), options); | |
1749 | ||
b2f4cfde | 1750 | /* As long as we're not replaying, just forward the request. */ |
1c63c994 | 1751 | if (!record_btrace_is_replaying (ops) && execution_direction != EXEC_REVERSE) |
b2f4cfde | 1752 | { |
e75fdfca TT |
1753 | ops = ops->beneath; |
1754 | return ops->to_wait (ops, ptid, status, options); | |
b2f4cfde MM |
1755 | } |
1756 | ||
52834460 MM |
1757 | /* Let's find a thread to move. */ |
1758 | tp = record_btrace_find_thread_to_move (ptid); | |
1759 | if (tp == NULL) | |
1760 | { | |
1761 | DEBUG ("wait %s: no thread", target_pid_to_str (ptid)); | |
1762 | ||
1763 | status->kind = TARGET_WAITKIND_IGNORE; | |
1764 | return minus_one_ptid; | |
1765 | } | |
1766 | ||
1767 | /* We only move a single thread. We're not able to correlate threads. */ | |
1768 | *status = record_btrace_step_thread (tp); | |
1769 | ||
1770 | /* Stop all other threads. */ | |
1771 | if (!non_stop) | |
034f788c | 1772 | ALL_NON_EXITED_THREADS (other) |
52834460 MM |
1773 | other->btrace.flags &= ~BTHR_MOVE; |
1774 | ||
1775 | /* Start record histories anew from the current position. */ | |
1776 | record_btrace_clear_histories (&tp->btrace); | |
1777 | ||
1778 | /* We moved the replay position but did not update registers. */ | |
1779 | registers_changed_ptid (tp->ptid); | |
1780 | ||
1781 | return tp->ptid; | |
1782 | } | |
1783 | ||
1784 | /* The to_can_execute_reverse method of target record-btrace. */ | |
1785 | ||
1786 | static int | |
19db3e69 | 1787 | record_btrace_can_execute_reverse (struct target_ops *self) |
52834460 MM |
1788 | { |
1789 | return 1; | |
1790 | } | |
1791 | ||
1792 | /* The to_decr_pc_after_break method of target record-btrace. */ | |
1793 | ||
1794 | static CORE_ADDR | |
1795 | record_btrace_decr_pc_after_break (struct target_ops *ops, | |
1796 | struct gdbarch *gdbarch) | |
1797 | { | |
1798 | /* When replaying, we do not actually execute the breakpoint instruction | |
1799 | so there is no need to adjust the PC after hitting a breakpoint. */ | |
1c63c994 | 1800 | if (record_btrace_is_replaying (ops)) |
52834460 MM |
1801 | return 0; |
1802 | ||
c0eca49f | 1803 | return ops->beneath->to_decr_pc_after_break (ops->beneath, gdbarch); |
b2f4cfde MM |
1804 | } |
1805 | ||
e8032dde | 1806 | /* The to_update_thread_list method of target record-btrace. */ |
e2887aa3 MM |
1807 | |
1808 | static void | |
e8032dde | 1809 | record_btrace_update_thread_list (struct target_ops *ops) |
e2887aa3 | 1810 | { |
e8032dde | 1811 | /* We don't add or remove threads during replay. */ |
1c63c994 | 1812 | if (record_btrace_is_replaying (ops)) |
e2887aa3 MM |
1813 | return; |
1814 | ||
1815 | /* Forward the request. */ | |
e75fdfca | 1816 | ops = ops->beneath; |
e8032dde | 1817 | ops->to_update_thread_list (ops); |
e2887aa3 MM |
1818 | } |
1819 | ||
1820 | /* The to_thread_alive method of target record-btrace. */ | |
1821 | ||
1822 | static int | |
1823 | record_btrace_thread_alive (struct target_ops *ops, ptid_t ptid) | |
1824 | { | |
1825 | /* We don't add or remove threads during replay. */ | |
1c63c994 | 1826 | if (record_btrace_is_replaying (ops)) |
e2887aa3 MM |
1827 | return find_thread_ptid (ptid) != NULL; |
1828 | ||
1829 | /* Forward the request. */ | |
e75fdfca TT |
1830 | ops = ops->beneath; |
1831 | return ops->to_thread_alive (ops, ptid); | |
e2887aa3 MM |
1832 | } |
1833 | ||
066ce621 MM |
1834 | /* Set the replay branch trace instruction iterator. If IT is NULL, replay |
1835 | is stopped. */ | |
1836 | ||
1837 | static void | |
1838 | record_btrace_set_replay (struct thread_info *tp, | |
1839 | const struct btrace_insn_iterator *it) | |
1840 | { | |
1841 | struct btrace_thread_info *btinfo; | |
1842 | ||
1843 | btinfo = &tp->btrace; | |
1844 | ||
1845 | if (it == NULL || it->function == NULL) | |
52834460 | 1846 | record_btrace_stop_replaying (tp); |
066ce621 MM |
1847 | else |
1848 | { | |
1849 | if (btinfo->replay == NULL) | |
52834460 | 1850 | record_btrace_start_replaying (tp); |
066ce621 MM |
1851 | else if (btrace_insn_cmp (btinfo->replay, it) == 0) |
1852 | return; | |
1853 | ||
1854 | *btinfo->replay = *it; | |
52834460 | 1855 | registers_changed_ptid (tp->ptid); |
066ce621 MM |
1856 | } |
1857 | ||
52834460 MM |
1858 | /* Start anew from the new replay position. */ |
1859 | record_btrace_clear_histories (btinfo); | |
066ce621 MM |
1860 | } |
1861 | ||
1862 | /* The to_goto_record_begin method of target record-btrace. */ | |
1863 | ||
1864 | static void | |
08475817 | 1865 | record_btrace_goto_begin (struct target_ops *self) |
066ce621 MM |
1866 | { |
1867 | struct thread_info *tp; | |
1868 | struct btrace_insn_iterator begin; | |
1869 | ||
1870 | tp = require_btrace_thread (); | |
1871 | ||
1872 | btrace_insn_begin (&begin, &tp->btrace); | |
1873 | record_btrace_set_replay (tp, &begin); | |
1874 | ||
1875 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); | |
1876 | } | |
1877 | ||
1878 | /* The to_goto_record_end method of target record-btrace. */ | |
1879 | ||
1880 | static void | |
307a1b91 | 1881 | record_btrace_goto_end (struct target_ops *ops) |
066ce621 MM |
1882 | { |
1883 | struct thread_info *tp; | |
1884 | ||
1885 | tp = require_btrace_thread (); | |
1886 | ||
1887 | record_btrace_set_replay (tp, NULL); | |
1888 | ||
1889 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); | |
1890 | } | |
1891 | ||
1892 | /* The to_goto_record method of target record-btrace. */ | |
1893 | ||
1894 | static void | |
606183ac | 1895 | record_btrace_goto (struct target_ops *self, ULONGEST insn) |
066ce621 MM |
1896 | { |
1897 | struct thread_info *tp; | |
1898 | struct btrace_insn_iterator it; | |
1899 | unsigned int number; | |
1900 | int found; | |
1901 | ||
1902 | number = insn; | |
1903 | ||
1904 | /* Check for wrap-arounds. */ | |
1905 | if (number != insn) | |
1906 | error (_("Instruction number out of range.")); | |
1907 | ||
1908 | tp = require_btrace_thread (); | |
1909 | ||
1910 | found = btrace_find_insn_by_number (&it, &tp->btrace, number); | |
1911 | if (found == 0) | |
1912 | error (_("No such instruction.")); | |
1913 | ||
1914 | record_btrace_set_replay (tp, &it); | |
1915 | ||
1916 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); | |
1917 | } | |
1918 | ||
70ad5bff MM |
1919 | /* The to_execution_direction target method. */ |
1920 | ||
1921 | static enum exec_direction_kind | |
1922 | record_btrace_execution_direction (struct target_ops *self) | |
1923 | { | |
1924 | return record_btrace_resume_exec_dir; | |
1925 | } | |
1926 | ||
aef92902 MM |
1927 | /* The to_prepare_to_generate_core target method. */ |
1928 | ||
1929 | static void | |
1930 | record_btrace_prepare_to_generate_core (struct target_ops *self) | |
1931 | { | |
1932 | record_btrace_generating_corefile = 1; | |
1933 | } | |
1934 | ||
1935 | /* The to_done_generating_core target method. */ | |
1936 | ||
1937 | static void | |
1938 | record_btrace_done_generating_core (struct target_ops *self) | |
1939 | { | |
1940 | record_btrace_generating_corefile = 0; | |
1941 | } | |
1942 | ||
afedecd3 MM |
1943 | /* Initialize the record-btrace target ops. */ |
1944 | ||
1945 | static void | |
1946 | init_record_btrace_ops (void) | |
1947 | { | |
1948 | struct target_ops *ops; | |
1949 | ||
1950 | ops = &record_btrace_ops; | |
1951 | ops->to_shortname = "record-btrace"; | |
1952 | ops->to_longname = "Branch tracing target"; | |
1953 | ops->to_doc = "Collect control-flow trace and provide the execution history."; | |
1954 | ops->to_open = record_btrace_open; | |
1955 | ops->to_close = record_btrace_close; | |
b7d2e916 | 1956 | ops->to_async = record_btrace_async; |
afedecd3 MM |
1957 | ops->to_detach = record_detach; |
1958 | ops->to_disconnect = record_disconnect; | |
1959 | ops->to_mourn_inferior = record_mourn_inferior; | |
1960 | ops->to_kill = record_kill; | |
afedecd3 MM |
1961 | ops->to_stop_recording = record_btrace_stop_recording; |
1962 | ops->to_info_record = record_btrace_info; | |
1963 | ops->to_insn_history = record_btrace_insn_history; | |
1964 | ops->to_insn_history_from = record_btrace_insn_history_from; | |
1965 | ops->to_insn_history_range = record_btrace_insn_history_range; | |
1966 | ops->to_call_history = record_btrace_call_history; | |
1967 | ops->to_call_history_from = record_btrace_call_history_from; | |
1968 | ops->to_call_history_range = record_btrace_call_history_range; | |
07bbe694 | 1969 | ops->to_record_is_replaying = record_btrace_is_replaying; |
633785ff MM |
1970 | ops->to_xfer_partial = record_btrace_xfer_partial; |
1971 | ops->to_remove_breakpoint = record_btrace_remove_breakpoint; | |
1972 | ops->to_insert_breakpoint = record_btrace_insert_breakpoint; | |
1f3ef581 MM |
1973 | ops->to_fetch_registers = record_btrace_fetch_registers; |
1974 | ops->to_store_registers = record_btrace_store_registers; | |
1975 | ops->to_prepare_to_store = record_btrace_prepare_to_store; | |
ac01945b TT |
1976 | ops->to_get_unwinder = &record_btrace_to_get_unwinder; |
1977 | ops->to_get_tailcall_unwinder = &record_btrace_to_get_tailcall_unwinder; | |
b2f4cfde MM |
1978 | ops->to_resume = record_btrace_resume; |
1979 | ops->to_wait = record_btrace_wait; | |
e8032dde | 1980 | ops->to_update_thread_list = record_btrace_update_thread_list; |
e2887aa3 | 1981 | ops->to_thread_alive = record_btrace_thread_alive; |
066ce621 MM |
1982 | ops->to_goto_record_begin = record_btrace_goto_begin; |
1983 | ops->to_goto_record_end = record_btrace_goto_end; | |
1984 | ops->to_goto_record = record_btrace_goto; | |
52834460 MM |
1985 | ops->to_can_execute_reverse = record_btrace_can_execute_reverse; |
1986 | ops->to_decr_pc_after_break = record_btrace_decr_pc_after_break; | |
70ad5bff | 1987 | ops->to_execution_direction = record_btrace_execution_direction; |
aef92902 MM |
1988 | ops->to_prepare_to_generate_core = record_btrace_prepare_to_generate_core; |
1989 | ops->to_done_generating_core = record_btrace_done_generating_core; | |
afedecd3 MM |
1990 | ops->to_stratum = record_stratum; |
1991 | ops->to_magic = OPS_MAGIC; | |
1992 | } | |
1993 | ||
1994 | /* Alias for "target record". */ | |
1995 | ||
1996 | static void | |
1997 | cmd_record_btrace_start (char *args, int from_tty) | |
1998 | { | |
1999 | if (args != NULL && *args != 0) | |
2000 | error (_("Invalid argument.")); | |
2001 | ||
2002 | execute_command ("target record-btrace", from_tty); | |
2003 | } | |
2004 | ||
67b5c0c1 MM |
2005 | /* The "set record btrace" command. */ |
2006 | ||
2007 | static void | |
2008 | cmd_set_record_btrace (char *args, int from_tty) | |
2009 | { | |
2010 | cmd_show_list (set_record_btrace_cmdlist, from_tty, ""); | |
2011 | } | |
2012 | ||
2013 | /* The "show record btrace" command. */ | |
2014 | ||
2015 | static void | |
2016 | cmd_show_record_btrace (char *args, int from_tty) | |
2017 | { | |
2018 | cmd_show_list (show_record_btrace_cmdlist, from_tty, ""); | |
2019 | } | |
2020 | ||
2021 | /* The "show record btrace replay-memory-access" command. */ | |
2022 | ||
2023 | static void | |
2024 | cmd_show_replay_memory_access (struct ui_file *file, int from_tty, | |
2025 | struct cmd_list_element *c, const char *value) | |
2026 | { | |
2027 | fprintf_filtered (gdb_stdout, _("Replay memory access is %s.\n"), | |
2028 | replay_memory_access); | |
2029 | } | |
2030 | ||
afedecd3 MM |
2031 | void _initialize_record_btrace (void); |
2032 | ||
2033 | /* Initialize btrace commands. */ | |
2034 | ||
2035 | void | |
2036 | _initialize_record_btrace (void) | |
2037 | { | |
2038 | add_cmd ("btrace", class_obscure, cmd_record_btrace_start, | |
2039 | _("Start branch trace recording."), | |
2040 | &record_cmdlist); | |
2041 | add_alias_cmd ("b", "btrace", class_obscure, 1, &record_cmdlist); | |
2042 | ||
67b5c0c1 MM |
2043 | add_prefix_cmd ("btrace", class_support, cmd_set_record_btrace, |
2044 | _("Set record options"), &set_record_btrace_cmdlist, | |
2045 | "set record btrace ", 0, &set_record_cmdlist); | |
2046 | ||
2047 | add_prefix_cmd ("btrace", class_support, cmd_show_record_btrace, | |
2048 | _("Show record options"), &show_record_btrace_cmdlist, | |
2049 | "show record btrace ", 0, &show_record_cmdlist); | |
2050 | ||
2051 | add_setshow_enum_cmd ("replay-memory-access", no_class, | |
2052 | replay_memory_access_types, &replay_memory_access, _("\ | |
2053 | Set what memory accesses are allowed during replay."), _("\ | |
2054 | Show what memory accesses are allowed during replay."), | |
2055 | _("Default is READ-ONLY.\n\n\ | |
2056 | The btrace record target does not trace data.\n\ | |
2057 | The memory therefore corresponds to the live target and not \ | |
2058 | to the current replay position.\n\n\ | |
2059 | When READ-ONLY, allow accesses to read-only memory during replay.\n\ | |
2060 | When READ-WRITE, allow accesses to read-only and read-write memory during \ | |
2061 | replay."), | |
2062 | NULL, cmd_show_replay_memory_access, | |
2063 | &set_record_btrace_cmdlist, | |
2064 | &show_record_btrace_cmdlist); | |
2065 | ||
afedecd3 MM |
2066 | init_record_btrace_ops (); |
2067 | add_target (&record_btrace_ops); | |
0b722aec MM |
2068 | |
2069 | bfcache = htab_create_alloc (50, bfcache_hash, bfcache_eq, NULL, | |
2070 | xcalloc, xfree); | |
afedecd3 | 2071 | } |