Commit | Line | Data |
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afedecd3 MM |
1 | /* Branch trace support for GDB, the GNU debugger. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2013-2014 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" | |
29 | #include "exceptions.h" | |
30 | #include "cli/cli-utils.h" | |
31 | #include "source.h" | |
32 | #include "ui-out.h" | |
33 | #include "symtab.h" | |
34 | #include "filenames.h" | |
1f3ef581 | 35 | #include "regcache.h" |
cecac1ab | 36 | #include "frame-unwind.h" |
0b722aec | 37 | #include "hashtab.h" |
45741a9c | 38 | #include "infrun.h" |
70ad5bff MM |
39 | #include "event-loop.h" |
40 | #include "inf-loop.h" | |
afedecd3 MM |
41 | |
42 | /* The target_ops of record-btrace. */ | |
43 | static struct target_ops record_btrace_ops; | |
44 | ||
45 | /* A new thread observer enabling branch tracing for the new thread. */ | |
46 | static struct observer *record_btrace_thread_observer; | |
47 | ||
67b5c0c1 MM |
48 | /* Memory access types used in set/show record btrace replay-memory-access. */ |
49 | static const char replay_memory_access_read_only[] = "read-only"; | |
50 | static const char replay_memory_access_read_write[] = "read-write"; | |
51 | static const char *const replay_memory_access_types[] = | |
52 | { | |
53 | replay_memory_access_read_only, | |
54 | replay_memory_access_read_write, | |
55 | NULL | |
56 | }; | |
57 | ||
58 | /* The currently allowed replay memory access type. */ | |
59 | static const char *replay_memory_access = replay_memory_access_read_only; | |
60 | ||
61 | /* Command lists for "set/show record btrace". */ | |
62 | static struct cmd_list_element *set_record_btrace_cmdlist; | |
63 | static struct cmd_list_element *show_record_btrace_cmdlist; | |
633785ff | 64 | |
70ad5bff MM |
65 | /* The execution direction of the last resume we got. See record-full.c. */ |
66 | static enum exec_direction_kind record_btrace_resume_exec_dir = EXEC_FORWARD; | |
67 | ||
68 | /* The async event handler for reverse/replay execution. */ | |
69 | static struct async_event_handler *record_btrace_async_inferior_event_handler; | |
70 | ||
aef92902 MM |
71 | /* A flag indicating that we are currently generating a core file. */ |
72 | static int record_btrace_generating_corefile; | |
73 | ||
afedecd3 MM |
74 | /* Print a record-btrace debug message. Use do ... while (0) to avoid |
75 | ambiguities when used in if statements. */ | |
76 | ||
77 | #define DEBUG(msg, args...) \ | |
78 | do \ | |
79 | { \ | |
80 | if (record_debug != 0) \ | |
81 | fprintf_unfiltered (gdb_stdlog, \ | |
82 | "[record-btrace] " msg "\n", ##args); \ | |
83 | } \ | |
84 | while (0) | |
85 | ||
86 | ||
87 | /* Update the branch trace for the current thread and return a pointer to its | |
066ce621 | 88 | thread_info. |
afedecd3 MM |
89 | |
90 | Throws an error if there is no thread or no trace. This function never | |
91 | returns NULL. */ | |
92 | ||
066ce621 MM |
93 | static struct thread_info * |
94 | require_btrace_thread (void) | |
afedecd3 MM |
95 | { |
96 | struct thread_info *tp; | |
afedecd3 MM |
97 | |
98 | DEBUG ("require"); | |
99 | ||
100 | tp = find_thread_ptid (inferior_ptid); | |
101 | if (tp == NULL) | |
102 | error (_("No thread.")); | |
103 | ||
104 | btrace_fetch (tp); | |
105 | ||
6e07b1d2 | 106 | if (btrace_is_empty (tp)) |
afedecd3 MM |
107 | error (_("No trace.")); |
108 | ||
066ce621 MM |
109 | return tp; |
110 | } | |
111 | ||
112 | /* Update the branch trace for the current thread and return a pointer to its | |
113 | branch trace information struct. | |
114 | ||
115 | Throws an error if there is no thread or no trace. This function never | |
116 | returns NULL. */ | |
117 | ||
118 | static struct btrace_thread_info * | |
119 | require_btrace (void) | |
120 | { | |
121 | struct thread_info *tp; | |
122 | ||
123 | tp = require_btrace_thread (); | |
124 | ||
125 | return &tp->btrace; | |
afedecd3 MM |
126 | } |
127 | ||
128 | /* Enable branch tracing for one thread. Warn on errors. */ | |
129 | ||
130 | static void | |
131 | record_btrace_enable_warn (struct thread_info *tp) | |
132 | { | |
133 | volatile struct gdb_exception error; | |
134 | ||
135 | TRY_CATCH (error, RETURN_MASK_ERROR) | |
136 | btrace_enable (tp); | |
137 | ||
138 | if (error.message != NULL) | |
139 | warning ("%s", error.message); | |
140 | } | |
141 | ||
142 | /* Callback function to disable branch tracing for one thread. */ | |
143 | ||
144 | static void | |
145 | record_btrace_disable_callback (void *arg) | |
146 | { | |
147 | struct thread_info *tp; | |
148 | ||
149 | tp = arg; | |
150 | ||
151 | btrace_disable (tp); | |
152 | } | |
153 | ||
154 | /* Enable automatic tracing of new threads. */ | |
155 | ||
156 | static void | |
157 | record_btrace_auto_enable (void) | |
158 | { | |
159 | DEBUG ("attach thread observer"); | |
160 | ||
161 | record_btrace_thread_observer | |
162 | = observer_attach_new_thread (record_btrace_enable_warn); | |
163 | } | |
164 | ||
165 | /* Disable automatic tracing of new threads. */ | |
166 | ||
167 | static void | |
168 | record_btrace_auto_disable (void) | |
169 | { | |
170 | /* The observer may have been detached, already. */ | |
171 | if (record_btrace_thread_observer == NULL) | |
172 | return; | |
173 | ||
174 | DEBUG ("detach thread observer"); | |
175 | ||
176 | observer_detach_new_thread (record_btrace_thread_observer); | |
177 | record_btrace_thread_observer = NULL; | |
178 | } | |
179 | ||
70ad5bff MM |
180 | /* The record-btrace async event handler function. */ |
181 | ||
182 | static void | |
183 | record_btrace_handle_async_inferior_event (gdb_client_data data) | |
184 | { | |
185 | inferior_event_handler (INF_REG_EVENT, NULL); | |
186 | } | |
187 | ||
afedecd3 MM |
188 | /* The to_open method of target record-btrace. */ |
189 | ||
190 | static void | |
191 | record_btrace_open (char *args, int from_tty) | |
192 | { | |
193 | struct cleanup *disable_chain; | |
194 | struct thread_info *tp; | |
195 | ||
196 | DEBUG ("open"); | |
197 | ||
8213266a | 198 | record_preopen (); |
afedecd3 MM |
199 | |
200 | if (!target_has_execution) | |
201 | error (_("The program is not being run.")); | |
202 | ||
203 | if (!target_supports_btrace ()) | |
204 | error (_("Target does not support branch tracing.")); | |
205 | ||
52834460 MM |
206 | if (non_stop) |
207 | error (_("Record btrace can't debug inferior in non-stop mode.")); | |
208 | ||
afedecd3 MM |
209 | gdb_assert (record_btrace_thread_observer == NULL); |
210 | ||
211 | disable_chain = make_cleanup (null_cleanup, NULL); | |
034f788c | 212 | ALL_NON_EXITED_THREADS (tp) |
afedecd3 MM |
213 | if (args == NULL || *args == 0 || number_is_in_list (args, tp->num)) |
214 | { | |
215 | btrace_enable (tp); | |
216 | ||
217 | make_cleanup (record_btrace_disable_callback, tp); | |
218 | } | |
219 | ||
220 | record_btrace_auto_enable (); | |
221 | ||
222 | push_target (&record_btrace_ops); | |
223 | ||
70ad5bff MM |
224 | record_btrace_async_inferior_event_handler |
225 | = create_async_event_handler (record_btrace_handle_async_inferior_event, | |
226 | NULL); | |
aef92902 | 227 | record_btrace_generating_corefile = 0; |
70ad5bff | 228 | |
afedecd3 MM |
229 | observer_notify_record_changed (current_inferior (), 1); |
230 | ||
231 | discard_cleanups (disable_chain); | |
232 | } | |
233 | ||
234 | /* The to_stop_recording method of target record-btrace. */ | |
235 | ||
236 | static void | |
c6cd7c02 | 237 | record_btrace_stop_recording (struct target_ops *self) |
afedecd3 MM |
238 | { |
239 | struct thread_info *tp; | |
240 | ||
241 | DEBUG ("stop recording"); | |
242 | ||
243 | record_btrace_auto_disable (); | |
244 | ||
034f788c | 245 | ALL_NON_EXITED_THREADS (tp) |
afedecd3 MM |
246 | if (tp->btrace.target != NULL) |
247 | btrace_disable (tp); | |
248 | } | |
249 | ||
250 | /* The to_close method of target record-btrace. */ | |
251 | ||
252 | static void | |
de90e03d | 253 | record_btrace_close (struct target_ops *self) |
afedecd3 | 254 | { |
568e808b MM |
255 | struct thread_info *tp; |
256 | ||
70ad5bff MM |
257 | if (record_btrace_async_inferior_event_handler != NULL) |
258 | delete_async_event_handler (&record_btrace_async_inferior_event_handler); | |
259 | ||
99c819ee MM |
260 | /* Make sure automatic recording gets disabled even if we did not stop |
261 | recording before closing the record-btrace target. */ | |
262 | record_btrace_auto_disable (); | |
263 | ||
568e808b MM |
264 | /* We should have already stopped recording. |
265 | Tear down btrace in case we have not. */ | |
034f788c | 266 | ALL_NON_EXITED_THREADS (tp) |
568e808b | 267 | btrace_teardown (tp); |
afedecd3 MM |
268 | } |
269 | ||
270 | /* The to_info_record method of target record-btrace. */ | |
271 | ||
272 | static void | |
630d6a4a | 273 | record_btrace_info (struct target_ops *self) |
afedecd3 MM |
274 | { |
275 | struct btrace_thread_info *btinfo; | |
276 | struct thread_info *tp; | |
23a7fe75 | 277 | unsigned int insns, calls; |
afedecd3 MM |
278 | |
279 | DEBUG ("info"); | |
280 | ||
281 | tp = find_thread_ptid (inferior_ptid); | |
282 | if (tp == NULL) | |
283 | error (_("No thread.")); | |
284 | ||
285 | btrace_fetch (tp); | |
286 | ||
23a7fe75 MM |
287 | insns = 0; |
288 | calls = 0; | |
289 | ||
afedecd3 | 290 | btinfo = &tp->btrace; |
6e07b1d2 MM |
291 | |
292 | if (!btrace_is_empty (tp)) | |
23a7fe75 MM |
293 | { |
294 | struct btrace_call_iterator call; | |
295 | struct btrace_insn_iterator insn; | |
296 | ||
297 | btrace_call_end (&call, btinfo); | |
298 | btrace_call_prev (&call, 1); | |
5de9129b | 299 | calls = btrace_call_number (&call); |
23a7fe75 MM |
300 | |
301 | btrace_insn_end (&insn, btinfo); | |
302 | btrace_insn_prev (&insn, 1); | |
5de9129b | 303 | insns = btrace_insn_number (&insn); |
23a7fe75 | 304 | } |
afedecd3 MM |
305 | |
306 | printf_unfiltered (_("Recorded %u instructions in %u functions for thread " | |
23a7fe75 | 307 | "%d (%s).\n"), insns, calls, tp->num, |
afedecd3 | 308 | target_pid_to_str (tp->ptid)); |
07bbe694 MM |
309 | |
310 | if (btrace_is_replaying (tp)) | |
311 | printf_unfiltered (_("Replay in progress. At instruction %u.\n"), | |
312 | btrace_insn_number (btinfo->replay)); | |
afedecd3 MM |
313 | } |
314 | ||
315 | /* Print an unsigned int. */ | |
316 | ||
317 | static void | |
318 | ui_out_field_uint (struct ui_out *uiout, const char *fld, unsigned int val) | |
319 | { | |
320 | ui_out_field_fmt (uiout, fld, "%u", val); | |
321 | } | |
322 | ||
323 | /* Disassemble a section of the recorded instruction trace. */ | |
324 | ||
325 | static void | |
23a7fe75 MM |
326 | btrace_insn_history (struct ui_out *uiout, |
327 | const struct btrace_insn_iterator *begin, | |
328 | const struct btrace_insn_iterator *end, int flags) | |
afedecd3 MM |
329 | { |
330 | struct gdbarch *gdbarch; | |
23a7fe75 | 331 | struct btrace_insn_iterator it; |
afedecd3 | 332 | |
23a7fe75 MM |
333 | DEBUG ("itrace (0x%x): [%u; %u)", flags, btrace_insn_number (begin), |
334 | btrace_insn_number (end)); | |
afedecd3 MM |
335 | |
336 | gdbarch = target_gdbarch (); | |
337 | ||
23a7fe75 | 338 | for (it = *begin; btrace_insn_cmp (&it, end) != 0; btrace_insn_next (&it, 1)) |
afedecd3 | 339 | { |
23a7fe75 MM |
340 | const struct btrace_insn *insn; |
341 | ||
342 | insn = btrace_insn_get (&it); | |
343 | ||
afedecd3 | 344 | /* Print the instruction index. */ |
23a7fe75 | 345 | ui_out_field_uint (uiout, "index", btrace_insn_number (&it)); |
afedecd3 MM |
346 | ui_out_text (uiout, "\t"); |
347 | ||
348 | /* Disassembly with '/m' flag may not produce the expected result. | |
349 | See PR gdb/11833. */ | |
23a7fe75 | 350 | gdb_disassembly (gdbarch, uiout, NULL, flags, 1, insn->pc, insn->pc + 1); |
afedecd3 MM |
351 | } |
352 | } | |
353 | ||
354 | /* The to_insn_history method of target record-btrace. */ | |
355 | ||
356 | static void | |
7a6c5609 | 357 | record_btrace_insn_history (struct target_ops *self, int size, int flags) |
afedecd3 MM |
358 | { |
359 | struct btrace_thread_info *btinfo; | |
23a7fe75 MM |
360 | struct btrace_insn_history *history; |
361 | struct btrace_insn_iterator begin, end; | |
afedecd3 MM |
362 | struct cleanup *uiout_cleanup; |
363 | struct ui_out *uiout; | |
23a7fe75 | 364 | unsigned int context, covered; |
afedecd3 MM |
365 | |
366 | uiout = current_uiout; | |
367 | uiout_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, | |
368 | "insn history"); | |
afedecd3 | 369 | context = abs (size); |
afedecd3 MM |
370 | if (context == 0) |
371 | error (_("Bad record instruction-history-size.")); | |
372 | ||
23a7fe75 MM |
373 | btinfo = require_btrace (); |
374 | history = btinfo->insn_history; | |
375 | if (history == NULL) | |
afedecd3 | 376 | { |
07bbe694 | 377 | struct btrace_insn_iterator *replay; |
afedecd3 | 378 | |
23a7fe75 | 379 | DEBUG ("insn-history (0x%x): %d", flags, size); |
afedecd3 | 380 | |
07bbe694 MM |
381 | /* If we're replaying, we start at the replay position. Otherwise, we |
382 | start at the tail of the trace. */ | |
383 | replay = btinfo->replay; | |
384 | if (replay != NULL) | |
385 | begin = *replay; | |
386 | else | |
387 | btrace_insn_end (&begin, btinfo); | |
388 | ||
389 | /* We start from here and expand in the requested direction. Then we | |
390 | expand in the other direction, as well, to fill up any remaining | |
391 | context. */ | |
392 | end = begin; | |
393 | if (size < 0) | |
394 | { | |
395 | /* We want the current position covered, as well. */ | |
396 | covered = btrace_insn_next (&end, 1); | |
397 | covered += btrace_insn_prev (&begin, context - covered); | |
398 | covered += btrace_insn_next (&end, context - covered); | |
399 | } | |
400 | else | |
401 | { | |
402 | covered = btrace_insn_next (&end, context); | |
403 | covered += btrace_insn_prev (&begin, context - covered); | |
404 | } | |
afedecd3 MM |
405 | } |
406 | else | |
407 | { | |
23a7fe75 MM |
408 | begin = history->begin; |
409 | end = history->end; | |
afedecd3 | 410 | |
23a7fe75 MM |
411 | DEBUG ("insn-history (0x%x): %d, prev: [%u; %u)", flags, size, |
412 | btrace_insn_number (&begin), btrace_insn_number (&end)); | |
afedecd3 | 413 | |
23a7fe75 MM |
414 | if (size < 0) |
415 | { | |
416 | end = begin; | |
417 | covered = btrace_insn_prev (&begin, context); | |
418 | } | |
419 | else | |
420 | { | |
421 | begin = end; | |
422 | covered = btrace_insn_next (&end, context); | |
423 | } | |
afedecd3 MM |
424 | } |
425 | ||
23a7fe75 MM |
426 | if (covered > 0) |
427 | btrace_insn_history (uiout, &begin, &end, flags); | |
428 | else | |
429 | { | |
430 | if (size < 0) | |
431 | printf_unfiltered (_("At the start of the branch trace record.\n")); | |
432 | else | |
433 | printf_unfiltered (_("At the end of the branch trace record.\n")); | |
434 | } | |
afedecd3 | 435 | |
23a7fe75 | 436 | btrace_set_insn_history (btinfo, &begin, &end); |
afedecd3 MM |
437 | do_cleanups (uiout_cleanup); |
438 | } | |
439 | ||
440 | /* The to_insn_history_range method of target record-btrace. */ | |
441 | ||
442 | static void | |
4e99c6b7 TT |
443 | record_btrace_insn_history_range (struct target_ops *self, |
444 | ULONGEST from, ULONGEST to, int flags) | |
afedecd3 MM |
445 | { |
446 | struct btrace_thread_info *btinfo; | |
23a7fe75 MM |
447 | struct btrace_insn_history *history; |
448 | struct btrace_insn_iterator begin, end; | |
afedecd3 MM |
449 | struct cleanup *uiout_cleanup; |
450 | struct ui_out *uiout; | |
23a7fe75 MM |
451 | unsigned int low, high; |
452 | int found; | |
afedecd3 MM |
453 | |
454 | uiout = current_uiout; | |
455 | uiout_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, | |
456 | "insn history"); | |
23a7fe75 MM |
457 | low = from; |
458 | high = to; | |
afedecd3 | 459 | |
23a7fe75 | 460 | DEBUG ("insn-history (0x%x): [%u; %u)", flags, low, high); |
afedecd3 MM |
461 | |
462 | /* Check for wrap-arounds. */ | |
23a7fe75 | 463 | if (low != from || high != to) |
afedecd3 MM |
464 | error (_("Bad range.")); |
465 | ||
0688d04e | 466 | if (high < low) |
afedecd3 MM |
467 | error (_("Bad range.")); |
468 | ||
23a7fe75 | 469 | btinfo = require_btrace (); |
afedecd3 | 470 | |
23a7fe75 MM |
471 | found = btrace_find_insn_by_number (&begin, btinfo, low); |
472 | if (found == 0) | |
473 | error (_("Range out of bounds.")); | |
afedecd3 | 474 | |
23a7fe75 MM |
475 | found = btrace_find_insn_by_number (&end, btinfo, high); |
476 | if (found == 0) | |
0688d04e MM |
477 | { |
478 | /* Silently truncate the range. */ | |
479 | btrace_insn_end (&end, btinfo); | |
480 | } | |
481 | else | |
482 | { | |
483 | /* We want both begin and end to be inclusive. */ | |
484 | btrace_insn_next (&end, 1); | |
485 | } | |
afedecd3 | 486 | |
23a7fe75 MM |
487 | btrace_insn_history (uiout, &begin, &end, flags); |
488 | btrace_set_insn_history (btinfo, &begin, &end); | |
afedecd3 MM |
489 | |
490 | do_cleanups (uiout_cleanup); | |
491 | } | |
492 | ||
493 | /* The to_insn_history_from method of target record-btrace. */ | |
494 | ||
495 | static void | |
9abc3ff3 TT |
496 | record_btrace_insn_history_from (struct target_ops *self, |
497 | ULONGEST from, int size, int flags) | |
afedecd3 MM |
498 | { |
499 | ULONGEST begin, end, context; | |
500 | ||
501 | context = abs (size); | |
0688d04e MM |
502 | if (context == 0) |
503 | error (_("Bad record instruction-history-size.")); | |
afedecd3 MM |
504 | |
505 | if (size < 0) | |
506 | { | |
507 | end = from; | |
508 | ||
509 | if (from < context) | |
510 | begin = 0; | |
511 | else | |
0688d04e | 512 | begin = from - context + 1; |
afedecd3 MM |
513 | } |
514 | else | |
515 | { | |
516 | begin = from; | |
0688d04e | 517 | end = from + context - 1; |
afedecd3 MM |
518 | |
519 | /* Check for wrap-around. */ | |
520 | if (end < begin) | |
521 | end = ULONGEST_MAX; | |
522 | } | |
523 | ||
4e99c6b7 | 524 | record_btrace_insn_history_range (self, begin, end, flags); |
afedecd3 MM |
525 | } |
526 | ||
527 | /* Print the instruction number range for a function call history line. */ | |
528 | ||
529 | static void | |
23a7fe75 MM |
530 | btrace_call_history_insn_range (struct ui_out *uiout, |
531 | const struct btrace_function *bfun) | |
afedecd3 | 532 | { |
7acbe133 MM |
533 | unsigned int begin, end, size; |
534 | ||
535 | size = VEC_length (btrace_insn_s, bfun->insn); | |
536 | gdb_assert (size > 0); | |
afedecd3 | 537 | |
23a7fe75 | 538 | begin = bfun->insn_offset; |
7acbe133 | 539 | end = begin + size - 1; |
afedecd3 | 540 | |
23a7fe75 | 541 | ui_out_field_uint (uiout, "insn begin", begin); |
8710b709 | 542 | ui_out_text (uiout, ","); |
23a7fe75 | 543 | ui_out_field_uint (uiout, "insn end", end); |
afedecd3 MM |
544 | } |
545 | ||
546 | /* Print the source line information for a function call history line. */ | |
547 | ||
548 | static void | |
23a7fe75 MM |
549 | btrace_call_history_src_line (struct ui_out *uiout, |
550 | const struct btrace_function *bfun) | |
afedecd3 MM |
551 | { |
552 | struct symbol *sym; | |
23a7fe75 | 553 | int begin, end; |
afedecd3 MM |
554 | |
555 | sym = bfun->sym; | |
556 | if (sym == NULL) | |
557 | return; | |
558 | ||
559 | ui_out_field_string (uiout, "file", | |
560 | symtab_to_filename_for_display (sym->symtab)); | |
561 | ||
23a7fe75 MM |
562 | begin = bfun->lbegin; |
563 | end = bfun->lend; | |
564 | ||
565 | if (end < begin) | |
afedecd3 MM |
566 | return; |
567 | ||
568 | ui_out_text (uiout, ":"); | |
23a7fe75 | 569 | ui_out_field_int (uiout, "min line", begin); |
afedecd3 | 570 | |
23a7fe75 | 571 | if (end == begin) |
afedecd3 MM |
572 | return; |
573 | ||
8710b709 | 574 | ui_out_text (uiout, ","); |
23a7fe75 | 575 | ui_out_field_int (uiout, "max line", end); |
afedecd3 MM |
576 | } |
577 | ||
0b722aec MM |
578 | /* Get the name of a branch trace function. */ |
579 | ||
580 | static const char * | |
581 | btrace_get_bfun_name (const struct btrace_function *bfun) | |
582 | { | |
583 | struct minimal_symbol *msym; | |
584 | struct symbol *sym; | |
585 | ||
586 | if (bfun == NULL) | |
587 | return "??"; | |
588 | ||
589 | msym = bfun->msym; | |
590 | sym = bfun->sym; | |
591 | ||
592 | if (sym != NULL) | |
593 | return SYMBOL_PRINT_NAME (sym); | |
594 | else if (msym != NULL) | |
efd66ac6 | 595 | return MSYMBOL_PRINT_NAME (msym); |
0b722aec MM |
596 | else |
597 | return "??"; | |
598 | } | |
599 | ||
afedecd3 MM |
600 | /* Disassemble a section of the recorded function trace. */ |
601 | ||
602 | static void | |
23a7fe75 | 603 | btrace_call_history (struct ui_out *uiout, |
8710b709 | 604 | const struct btrace_thread_info *btinfo, |
23a7fe75 MM |
605 | const struct btrace_call_iterator *begin, |
606 | const struct btrace_call_iterator *end, | |
afedecd3 MM |
607 | enum record_print_flag flags) |
608 | { | |
23a7fe75 | 609 | struct btrace_call_iterator it; |
afedecd3 | 610 | |
23a7fe75 MM |
611 | DEBUG ("ftrace (0x%x): [%u; %u)", flags, btrace_call_number (begin), |
612 | btrace_call_number (end)); | |
afedecd3 | 613 | |
23a7fe75 | 614 | for (it = *begin; btrace_call_cmp (&it, end) < 0; btrace_call_next (&it, 1)) |
afedecd3 | 615 | { |
23a7fe75 MM |
616 | const struct btrace_function *bfun; |
617 | struct minimal_symbol *msym; | |
618 | struct symbol *sym; | |
619 | ||
620 | bfun = btrace_call_get (&it); | |
23a7fe75 | 621 | sym = bfun->sym; |
0b722aec | 622 | msym = bfun->msym; |
23a7fe75 | 623 | |
afedecd3 | 624 | /* Print the function index. */ |
23a7fe75 | 625 | ui_out_field_uint (uiout, "index", bfun->number); |
afedecd3 MM |
626 | ui_out_text (uiout, "\t"); |
627 | ||
8710b709 MM |
628 | if ((flags & RECORD_PRINT_INDENT_CALLS) != 0) |
629 | { | |
630 | int level = bfun->level + btinfo->level, i; | |
631 | ||
632 | for (i = 0; i < level; ++i) | |
633 | ui_out_text (uiout, " "); | |
634 | } | |
635 | ||
636 | if (sym != NULL) | |
637 | ui_out_field_string (uiout, "function", SYMBOL_PRINT_NAME (sym)); | |
638 | else if (msym != NULL) | |
efd66ac6 | 639 | ui_out_field_string (uiout, "function", MSYMBOL_PRINT_NAME (msym)); |
8710b709 MM |
640 | else if (!ui_out_is_mi_like_p (uiout)) |
641 | ui_out_field_string (uiout, "function", "??"); | |
642 | ||
1e038f67 | 643 | if ((flags & RECORD_PRINT_INSN_RANGE) != 0) |
afedecd3 | 644 | { |
8710b709 | 645 | ui_out_text (uiout, _("\tinst ")); |
23a7fe75 | 646 | btrace_call_history_insn_range (uiout, bfun); |
afedecd3 MM |
647 | } |
648 | ||
1e038f67 | 649 | if ((flags & RECORD_PRINT_SRC_LINE) != 0) |
afedecd3 | 650 | { |
8710b709 | 651 | ui_out_text (uiout, _("\tat ")); |
23a7fe75 | 652 | btrace_call_history_src_line (uiout, bfun); |
afedecd3 MM |
653 | } |
654 | ||
afedecd3 MM |
655 | ui_out_text (uiout, "\n"); |
656 | } | |
657 | } | |
658 | ||
659 | /* The to_call_history method of target record-btrace. */ | |
660 | ||
661 | static void | |
5df2fcba | 662 | record_btrace_call_history (struct target_ops *self, int size, int flags) |
afedecd3 MM |
663 | { |
664 | struct btrace_thread_info *btinfo; | |
23a7fe75 MM |
665 | struct btrace_call_history *history; |
666 | struct btrace_call_iterator begin, end; | |
afedecd3 MM |
667 | struct cleanup *uiout_cleanup; |
668 | struct ui_out *uiout; | |
23a7fe75 | 669 | unsigned int context, covered; |
afedecd3 MM |
670 | |
671 | uiout = current_uiout; | |
672 | uiout_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, | |
673 | "insn history"); | |
afedecd3 | 674 | context = abs (size); |
afedecd3 MM |
675 | if (context == 0) |
676 | error (_("Bad record function-call-history-size.")); | |
677 | ||
23a7fe75 MM |
678 | btinfo = require_btrace (); |
679 | history = btinfo->call_history; | |
680 | if (history == NULL) | |
afedecd3 | 681 | { |
07bbe694 | 682 | struct btrace_insn_iterator *replay; |
afedecd3 | 683 | |
23a7fe75 | 684 | DEBUG ("call-history (0x%x): %d", flags, size); |
afedecd3 | 685 | |
07bbe694 MM |
686 | /* If we're replaying, we start at the replay position. Otherwise, we |
687 | start at the tail of the trace. */ | |
688 | replay = btinfo->replay; | |
689 | if (replay != NULL) | |
690 | { | |
691 | begin.function = replay->function; | |
692 | begin.btinfo = btinfo; | |
693 | } | |
694 | else | |
695 | btrace_call_end (&begin, btinfo); | |
696 | ||
697 | /* We start from here and expand in the requested direction. Then we | |
698 | expand in the other direction, as well, to fill up any remaining | |
699 | context. */ | |
700 | end = begin; | |
701 | if (size < 0) | |
702 | { | |
703 | /* We want the current position covered, as well. */ | |
704 | covered = btrace_call_next (&end, 1); | |
705 | covered += btrace_call_prev (&begin, context - covered); | |
706 | covered += btrace_call_next (&end, context - covered); | |
707 | } | |
708 | else | |
709 | { | |
710 | covered = btrace_call_next (&end, context); | |
711 | covered += btrace_call_prev (&begin, context- covered); | |
712 | } | |
afedecd3 MM |
713 | } |
714 | else | |
715 | { | |
23a7fe75 MM |
716 | begin = history->begin; |
717 | end = history->end; | |
afedecd3 | 718 | |
23a7fe75 MM |
719 | DEBUG ("call-history (0x%x): %d, prev: [%u; %u)", flags, size, |
720 | btrace_call_number (&begin), btrace_call_number (&end)); | |
afedecd3 | 721 | |
23a7fe75 MM |
722 | if (size < 0) |
723 | { | |
724 | end = begin; | |
725 | covered = btrace_call_prev (&begin, context); | |
726 | } | |
727 | else | |
728 | { | |
729 | begin = end; | |
730 | covered = btrace_call_next (&end, context); | |
731 | } | |
afedecd3 MM |
732 | } |
733 | ||
23a7fe75 | 734 | if (covered > 0) |
8710b709 | 735 | btrace_call_history (uiout, btinfo, &begin, &end, flags); |
23a7fe75 MM |
736 | else |
737 | { | |
738 | if (size < 0) | |
739 | printf_unfiltered (_("At the start of the branch trace record.\n")); | |
740 | else | |
741 | printf_unfiltered (_("At the end of the branch trace record.\n")); | |
742 | } | |
afedecd3 | 743 | |
23a7fe75 | 744 | btrace_set_call_history (btinfo, &begin, &end); |
afedecd3 MM |
745 | do_cleanups (uiout_cleanup); |
746 | } | |
747 | ||
748 | /* The to_call_history_range method of target record-btrace. */ | |
749 | ||
750 | static void | |
f0d960ea TT |
751 | record_btrace_call_history_range (struct target_ops *self, |
752 | ULONGEST from, ULONGEST to, int flags) | |
afedecd3 MM |
753 | { |
754 | struct btrace_thread_info *btinfo; | |
23a7fe75 MM |
755 | struct btrace_call_history *history; |
756 | struct btrace_call_iterator begin, end; | |
afedecd3 MM |
757 | struct cleanup *uiout_cleanup; |
758 | struct ui_out *uiout; | |
23a7fe75 MM |
759 | unsigned int low, high; |
760 | int found; | |
afedecd3 MM |
761 | |
762 | uiout = current_uiout; | |
763 | uiout_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, | |
764 | "func history"); | |
23a7fe75 MM |
765 | low = from; |
766 | high = to; | |
afedecd3 | 767 | |
23a7fe75 | 768 | DEBUG ("call-history (0x%x): [%u; %u)", flags, low, high); |
afedecd3 MM |
769 | |
770 | /* Check for wrap-arounds. */ | |
23a7fe75 | 771 | if (low != from || high != to) |
afedecd3 MM |
772 | error (_("Bad range.")); |
773 | ||
0688d04e | 774 | if (high < low) |
afedecd3 MM |
775 | error (_("Bad range.")); |
776 | ||
23a7fe75 | 777 | btinfo = require_btrace (); |
afedecd3 | 778 | |
23a7fe75 MM |
779 | found = btrace_find_call_by_number (&begin, btinfo, low); |
780 | if (found == 0) | |
781 | error (_("Range out of bounds.")); | |
afedecd3 | 782 | |
23a7fe75 MM |
783 | found = btrace_find_call_by_number (&end, btinfo, high); |
784 | if (found == 0) | |
0688d04e MM |
785 | { |
786 | /* Silently truncate the range. */ | |
787 | btrace_call_end (&end, btinfo); | |
788 | } | |
789 | else | |
790 | { | |
791 | /* We want both begin and end to be inclusive. */ | |
792 | btrace_call_next (&end, 1); | |
793 | } | |
afedecd3 | 794 | |
8710b709 | 795 | btrace_call_history (uiout, btinfo, &begin, &end, flags); |
23a7fe75 | 796 | btrace_set_call_history (btinfo, &begin, &end); |
afedecd3 MM |
797 | |
798 | do_cleanups (uiout_cleanup); | |
799 | } | |
800 | ||
801 | /* The to_call_history_from method of target record-btrace. */ | |
802 | ||
803 | static void | |
ec0aea04 TT |
804 | record_btrace_call_history_from (struct target_ops *self, |
805 | ULONGEST from, int size, int flags) | |
afedecd3 MM |
806 | { |
807 | ULONGEST begin, end, context; | |
808 | ||
809 | context = abs (size); | |
0688d04e MM |
810 | if (context == 0) |
811 | error (_("Bad record function-call-history-size.")); | |
afedecd3 MM |
812 | |
813 | if (size < 0) | |
814 | { | |
815 | end = from; | |
816 | ||
817 | if (from < context) | |
818 | begin = 0; | |
819 | else | |
0688d04e | 820 | begin = from - context + 1; |
afedecd3 MM |
821 | } |
822 | else | |
823 | { | |
824 | begin = from; | |
0688d04e | 825 | end = from + context - 1; |
afedecd3 MM |
826 | |
827 | /* Check for wrap-around. */ | |
828 | if (end < begin) | |
829 | end = ULONGEST_MAX; | |
830 | } | |
831 | ||
f0d960ea | 832 | record_btrace_call_history_range (self, begin, end, flags); |
afedecd3 MM |
833 | } |
834 | ||
07bbe694 MM |
835 | /* The to_record_is_replaying method of target record-btrace. */ |
836 | ||
837 | static int | |
1c63c994 | 838 | record_btrace_is_replaying (struct target_ops *self) |
07bbe694 MM |
839 | { |
840 | struct thread_info *tp; | |
841 | ||
034f788c | 842 | ALL_NON_EXITED_THREADS (tp) |
07bbe694 MM |
843 | if (btrace_is_replaying (tp)) |
844 | return 1; | |
845 | ||
846 | return 0; | |
847 | } | |
848 | ||
633785ff MM |
849 | /* The to_xfer_partial method of target record-btrace. */ |
850 | ||
9b409511 | 851 | static enum target_xfer_status |
633785ff MM |
852 | record_btrace_xfer_partial (struct target_ops *ops, enum target_object object, |
853 | const char *annex, gdb_byte *readbuf, | |
854 | const gdb_byte *writebuf, ULONGEST offset, | |
9b409511 | 855 | ULONGEST len, ULONGEST *xfered_len) |
633785ff MM |
856 | { |
857 | struct target_ops *t; | |
858 | ||
859 | /* Filter out requests that don't make sense during replay. */ | |
67b5c0c1 | 860 | if (replay_memory_access == replay_memory_access_read_only |
aef92902 | 861 | && !record_btrace_generating_corefile |
67b5c0c1 | 862 | && record_btrace_is_replaying (ops)) |
633785ff MM |
863 | { |
864 | switch (object) | |
865 | { | |
866 | case TARGET_OBJECT_MEMORY: | |
867 | { | |
868 | struct target_section *section; | |
869 | ||
870 | /* We do not allow writing memory in general. */ | |
871 | if (writebuf != NULL) | |
9b409511 YQ |
872 | { |
873 | *xfered_len = len; | |
bc113b4e | 874 | return TARGET_XFER_UNAVAILABLE; |
9b409511 | 875 | } |
633785ff MM |
876 | |
877 | /* We allow reading readonly memory. */ | |
878 | section = target_section_by_addr (ops, offset); | |
879 | if (section != NULL) | |
880 | { | |
881 | /* Check if the section we found is readonly. */ | |
882 | if ((bfd_get_section_flags (section->the_bfd_section->owner, | |
883 | section->the_bfd_section) | |
884 | & SEC_READONLY) != 0) | |
885 | { | |
886 | /* Truncate the request to fit into this section. */ | |
887 | len = min (len, section->endaddr - offset); | |
888 | break; | |
889 | } | |
890 | } | |
891 | ||
9b409511 | 892 | *xfered_len = len; |
bc113b4e | 893 | return TARGET_XFER_UNAVAILABLE; |
633785ff MM |
894 | } |
895 | } | |
896 | } | |
897 | ||
898 | /* Forward the request. */ | |
899 | for (ops = ops->beneath; ops != NULL; ops = ops->beneath) | |
900 | if (ops->to_xfer_partial != NULL) | |
901 | return ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, | |
9b409511 | 902 | offset, len, xfered_len); |
633785ff | 903 | |
9b409511 | 904 | *xfered_len = len; |
bc113b4e | 905 | return TARGET_XFER_UNAVAILABLE; |
633785ff MM |
906 | } |
907 | ||
908 | /* The to_insert_breakpoint method of target record-btrace. */ | |
909 | ||
910 | static int | |
911 | record_btrace_insert_breakpoint (struct target_ops *ops, | |
912 | struct gdbarch *gdbarch, | |
913 | struct bp_target_info *bp_tgt) | |
914 | { | |
915 | volatile struct gdb_exception except; | |
67b5c0c1 MM |
916 | const char *old; |
917 | int ret; | |
633785ff MM |
918 | |
919 | /* Inserting breakpoints requires accessing memory. Allow it for the | |
920 | duration of this function. */ | |
67b5c0c1 MM |
921 | old = replay_memory_access; |
922 | replay_memory_access = replay_memory_access_read_write; | |
633785ff MM |
923 | |
924 | ret = 0; | |
925 | TRY_CATCH (except, RETURN_MASK_ALL) | |
6b84065d | 926 | ret = ops->beneath->to_insert_breakpoint (ops->beneath, gdbarch, bp_tgt); |
633785ff | 927 | |
67b5c0c1 | 928 | replay_memory_access = old; |
633785ff MM |
929 | |
930 | if (except.reason < 0) | |
931 | throw_exception (except); | |
932 | ||
933 | return ret; | |
934 | } | |
935 | ||
936 | /* The to_remove_breakpoint method of target record-btrace. */ | |
937 | ||
938 | static int | |
939 | record_btrace_remove_breakpoint (struct target_ops *ops, | |
940 | struct gdbarch *gdbarch, | |
941 | struct bp_target_info *bp_tgt) | |
942 | { | |
943 | volatile struct gdb_exception except; | |
67b5c0c1 MM |
944 | const char *old; |
945 | int ret; | |
633785ff MM |
946 | |
947 | /* Removing breakpoints requires accessing memory. Allow it for the | |
948 | duration of this function. */ | |
67b5c0c1 MM |
949 | old = replay_memory_access; |
950 | replay_memory_access = replay_memory_access_read_write; | |
633785ff MM |
951 | |
952 | ret = 0; | |
953 | TRY_CATCH (except, RETURN_MASK_ALL) | |
6b84065d | 954 | ret = ops->beneath->to_remove_breakpoint (ops->beneath, gdbarch, bp_tgt); |
633785ff | 955 | |
67b5c0c1 | 956 | replay_memory_access = old; |
633785ff MM |
957 | |
958 | if (except.reason < 0) | |
959 | throw_exception (except); | |
960 | ||
961 | return ret; | |
962 | } | |
963 | ||
1f3ef581 MM |
964 | /* The to_fetch_registers method of target record-btrace. */ |
965 | ||
966 | static void | |
967 | record_btrace_fetch_registers (struct target_ops *ops, | |
968 | struct regcache *regcache, int regno) | |
969 | { | |
970 | struct btrace_insn_iterator *replay; | |
971 | struct thread_info *tp; | |
972 | ||
973 | tp = find_thread_ptid (inferior_ptid); | |
974 | gdb_assert (tp != NULL); | |
975 | ||
976 | replay = tp->btrace.replay; | |
aef92902 | 977 | if (replay != NULL && !record_btrace_generating_corefile) |
1f3ef581 MM |
978 | { |
979 | const struct btrace_insn *insn; | |
980 | struct gdbarch *gdbarch; | |
981 | int pcreg; | |
982 | ||
983 | gdbarch = get_regcache_arch (regcache); | |
984 | pcreg = gdbarch_pc_regnum (gdbarch); | |
985 | if (pcreg < 0) | |
986 | return; | |
987 | ||
988 | /* We can only provide the PC register. */ | |
989 | if (regno >= 0 && regno != pcreg) | |
990 | return; | |
991 | ||
992 | insn = btrace_insn_get (replay); | |
993 | gdb_assert (insn != NULL); | |
994 | ||
995 | regcache_raw_supply (regcache, regno, &insn->pc); | |
996 | } | |
997 | else | |
998 | { | |
999 | struct target_ops *t; | |
1000 | ||
1001 | for (t = ops->beneath; t != NULL; t = t->beneath) | |
1002 | if (t->to_fetch_registers != NULL) | |
1003 | { | |
1004 | t->to_fetch_registers (t, regcache, regno); | |
1005 | break; | |
1006 | } | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | /* The to_store_registers method of target record-btrace. */ | |
1011 | ||
1012 | static void | |
1013 | record_btrace_store_registers (struct target_ops *ops, | |
1014 | struct regcache *regcache, int regno) | |
1015 | { | |
1016 | struct target_ops *t; | |
1017 | ||
aef92902 | 1018 | if (!record_btrace_generating_corefile && record_btrace_is_replaying (ops)) |
1f3ef581 MM |
1019 | error (_("This record target does not allow writing registers.")); |
1020 | ||
1021 | gdb_assert (may_write_registers != 0); | |
1022 | ||
1023 | for (t = ops->beneath; t != NULL; t = t->beneath) | |
1024 | if (t->to_store_registers != NULL) | |
1025 | { | |
1026 | t->to_store_registers (t, regcache, regno); | |
1027 | return; | |
1028 | } | |
1029 | ||
1030 | noprocess (); | |
1031 | } | |
1032 | ||
1033 | /* The to_prepare_to_store method of target record-btrace. */ | |
1034 | ||
1035 | static void | |
1036 | record_btrace_prepare_to_store (struct target_ops *ops, | |
1037 | struct regcache *regcache) | |
1038 | { | |
1039 | struct target_ops *t; | |
1040 | ||
aef92902 | 1041 | if (!record_btrace_generating_corefile && record_btrace_is_replaying (ops)) |
1f3ef581 MM |
1042 | return; |
1043 | ||
1044 | for (t = ops->beneath; t != NULL; t = t->beneath) | |
1045 | if (t->to_prepare_to_store != NULL) | |
1046 | { | |
1047 | t->to_prepare_to_store (t, regcache); | |
1048 | return; | |
1049 | } | |
1050 | } | |
1051 | ||
0b722aec MM |
1052 | /* The branch trace frame cache. */ |
1053 | ||
1054 | struct btrace_frame_cache | |
1055 | { | |
1056 | /* The thread. */ | |
1057 | struct thread_info *tp; | |
1058 | ||
1059 | /* The frame info. */ | |
1060 | struct frame_info *frame; | |
1061 | ||
1062 | /* The branch trace function segment. */ | |
1063 | const struct btrace_function *bfun; | |
1064 | }; | |
1065 | ||
1066 | /* A struct btrace_frame_cache hash table indexed by NEXT. */ | |
1067 | ||
1068 | static htab_t bfcache; | |
1069 | ||
1070 | /* hash_f for htab_create_alloc of bfcache. */ | |
1071 | ||
1072 | static hashval_t | |
1073 | bfcache_hash (const void *arg) | |
1074 | { | |
1075 | const struct btrace_frame_cache *cache = arg; | |
1076 | ||
1077 | return htab_hash_pointer (cache->frame); | |
1078 | } | |
1079 | ||
1080 | /* eq_f for htab_create_alloc of bfcache. */ | |
1081 | ||
1082 | static int | |
1083 | bfcache_eq (const void *arg1, const void *arg2) | |
1084 | { | |
1085 | const struct btrace_frame_cache *cache1 = arg1; | |
1086 | const struct btrace_frame_cache *cache2 = arg2; | |
1087 | ||
1088 | return cache1->frame == cache2->frame; | |
1089 | } | |
1090 | ||
1091 | /* Create a new btrace frame cache. */ | |
1092 | ||
1093 | static struct btrace_frame_cache * | |
1094 | bfcache_new (struct frame_info *frame) | |
1095 | { | |
1096 | struct btrace_frame_cache *cache; | |
1097 | void **slot; | |
1098 | ||
1099 | cache = FRAME_OBSTACK_ZALLOC (struct btrace_frame_cache); | |
1100 | cache->frame = frame; | |
1101 | ||
1102 | slot = htab_find_slot (bfcache, cache, INSERT); | |
1103 | gdb_assert (*slot == NULL); | |
1104 | *slot = cache; | |
1105 | ||
1106 | return cache; | |
1107 | } | |
1108 | ||
1109 | /* Extract the branch trace function from a branch trace frame. */ | |
1110 | ||
1111 | static const struct btrace_function * | |
1112 | btrace_get_frame_function (struct frame_info *frame) | |
1113 | { | |
1114 | const struct btrace_frame_cache *cache; | |
1115 | const struct btrace_function *bfun; | |
1116 | struct btrace_frame_cache pattern; | |
1117 | void **slot; | |
1118 | ||
1119 | pattern.frame = frame; | |
1120 | ||
1121 | slot = htab_find_slot (bfcache, &pattern, NO_INSERT); | |
1122 | if (slot == NULL) | |
1123 | return NULL; | |
1124 | ||
1125 | cache = *slot; | |
1126 | return cache->bfun; | |
1127 | } | |
1128 | ||
cecac1ab MM |
1129 | /* Implement stop_reason method for record_btrace_frame_unwind. */ |
1130 | ||
1131 | static enum unwind_stop_reason | |
1132 | record_btrace_frame_unwind_stop_reason (struct frame_info *this_frame, | |
1133 | void **this_cache) | |
1134 | { | |
0b722aec MM |
1135 | const struct btrace_frame_cache *cache; |
1136 | const struct btrace_function *bfun; | |
1137 | ||
1138 | cache = *this_cache; | |
1139 | bfun = cache->bfun; | |
1140 | gdb_assert (bfun != NULL); | |
1141 | ||
1142 | if (bfun->up == NULL) | |
1143 | return UNWIND_UNAVAILABLE; | |
1144 | ||
1145 | return UNWIND_NO_REASON; | |
cecac1ab MM |
1146 | } |
1147 | ||
1148 | /* Implement this_id method for record_btrace_frame_unwind. */ | |
1149 | ||
1150 | static void | |
1151 | record_btrace_frame_this_id (struct frame_info *this_frame, void **this_cache, | |
1152 | struct frame_id *this_id) | |
1153 | { | |
0b722aec MM |
1154 | const struct btrace_frame_cache *cache; |
1155 | const struct btrace_function *bfun; | |
1156 | CORE_ADDR code, special; | |
1157 | ||
1158 | cache = *this_cache; | |
1159 | ||
1160 | bfun = cache->bfun; | |
1161 | gdb_assert (bfun != NULL); | |
1162 | ||
1163 | while (bfun->segment.prev != NULL) | |
1164 | bfun = bfun->segment.prev; | |
1165 | ||
1166 | code = get_frame_func (this_frame); | |
1167 | special = bfun->number; | |
1168 | ||
1169 | *this_id = frame_id_build_unavailable_stack_special (code, special); | |
1170 | ||
1171 | DEBUG ("[frame] %s id: (!stack, pc=%s, special=%s)", | |
1172 | btrace_get_bfun_name (cache->bfun), | |
1173 | core_addr_to_string_nz (this_id->code_addr), | |
1174 | core_addr_to_string_nz (this_id->special_addr)); | |
cecac1ab MM |
1175 | } |
1176 | ||
1177 | /* Implement prev_register method for record_btrace_frame_unwind. */ | |
1178 | ||
1179 | static struct value * | |
1180 | record_btrace_frame_prev_register (struct frame_info *this_frame, | |
1181 | void **this_cache, | |
1182 | int regnum) | |
1183 | { | |
0b722aec MM |
1184 | const struct btrace_frame_cache *cache; |
1185 | const struct btrace_function *bfun, *caller; | |
1186 | const struct btrace_insn *insn; | |
1187 | struct gdbarch *gdbarch; | |
1188 | CORE_ADDR pc; | |
1189 | int pcreg; | |
1190 | ||
1191 | gdbarch = get_frame_arch (this_frame); | |
1192 | pcreg = gdbarch_pc_regnum (gdbarch); | |
1193 | if (pcreg < 0 || regnum != pcreg) | |
1194 | throw_error (NOT_AVAILABLE_ERROR, | |
1195 | _("Registers are not available in btrace record history")); | |
1196 | ||
1197 | cache = *this_cache; | |
1198 | bfun = cache->bfun; | |
1199 | gdb_assert (bfun != NULL); | |
1200 | ||
1201 | caller = bfun->up; | |
1202 | if (caller == NULL) | |
1203 | throw_error (NOT_AVAILABLE_ERROR, | |
1204 | _("No caller in btrace record history")); | |
1205 | ||
1206 | if ((bfun->flags & BFUN_UP_LINKS_TO_RET) != 0) | |
1207 | { | |
1208 | insn = VEC_index (btrace_insn_s, caller->insn, 0); | |
1209 | pc = insn->pc; | |
1210 | } | |
1211 | else | |
1212 | { | |
1213 | insn = VEC_last (btrace_insn_s, caller->insn); | |
1214 | pc = insn->pc; | |
1215 | ||
1216 | pc += gdb_insn_length (gdbarch, pc); | |
1217 | } | |
1218 | ||
1219 | DEBUG ("[frame] unwound PC in %s on level %d: %s", | |
1220 | btrace_get_bfun_name (bfun), bfun->level, | |
1221 | core_addr_to_string_nz (pc)); | |
1222 | ||
1223 | return frame_unwind_got_address (this_frame, regnum, pc); | |
cecac1ab MM |
1224 | } |
1225 | ||
1226 | /* Implement sniffer method for record_btrace_frame_unwind. */ | |
1227 | ||
1228 | static int | |
1229 | record_btrace_frame_sniffer (const struct frame_unwind *self, | |
1230 | struct frame_info *this_frame, | |
1231 | void **this_cache) | |
1232 | { | |
0b722aec MM |
1233 | const struct btrace_function *bfun; |
1234 | struct btrace_frame_cache *cache; | |
cecac1ab | 1235 | struct thread_info *tp; |
0b722aec | 1236 | struct frame_info *next; |
cecac1ab MM |
1237 | |
1238 | /* THIS_FRAME does not contain a reference to its thread. */ | |
1239 | tp = find_thread_ptid (inferior_ptid); | |
1240 | gdb_assert (tp != NULL); | |
1241 | ||
0b722aec MM |
1242 | bfun = NULL; |
1243 | next = get_next_frame (this_frame); | |
1244 | if (next == NULL) | |
1245 | { | |
1246 | const struct btrace_insn_iterator *replay; | |
1247 | ||
1248 | replay = tp->btrace.replay; | |
1249 | if (replay != NULL) | |
1250 | bfun = replay->function; | |
1251 | } | |
1252 | else | |
1253 | { | |
1254 | const struct btrace_function *callee; | |
1255 | ||
1256 | callee = btrace_get_frame_function (next); | |
1257 | if (callee != NULL && (callee->flags & BFUN_UP_LINKS_TO_TAILCALL) == 0) | |
1258 | bfun = callee->up; | |
1259 | } | |
1260 | ||
1261 | if (bfun == NULL) | |
1262 | return 0; | |
1263 | ||
1264 | DEBUG ("[frame] sniffed frame for %s on level %d", | |
1265 | btrace_get_bfun_name (bfun), bfun->level); | |
1266 | ||
1267 | /* This is our frame. Initialize the frame cache. */ | |
1268 | cache = bfcache_new (this_frame); | |
1269 | cache->tp = tp; | |
1270 | cache->bfun = bfun; | |
1271 | ||
1272 | *this_cache = cache; | |
1273 | return 1; | |
1274 | } | |
1275 | ||
1276 | /* Implement sniffer method for record_btrace_tailcall_frame_unwind. */ | |
1277 | ||
1278 | static int | |
1279 | record_btrace_tailcall_frame_sniffer (const struct frame_unwind *self, | |
1280 | struct frame_info *this_frame, | |
1281 | void **this_cache) | |
1282 | { | |
1283 | const struct btrace_function *bfun, *callee; | |
1284 | struct btrace_frame_cache *cache; | |
1285 | struct frame_info *next; | |
1286 | ||
1287 | next = get_next_frame (this_frame); | |
1288 | if (next == NULL) | |
1289 | return 0; | |
1290 | ||
1291 | callee = btrace_get_frame_function (next); | |
1292 | if (callee == NULL) | |
1293 | return 0; | |
1294 | ||
1295 | if ((callee->flags & BFUN_UP_LINKS_TO_TAILCALL) == 0) | |
1296 | return 0; | |
1297 | ||
1298 | bfun = callee->up; | |
1299 | if (bfun == NULL) | |
1300 | return 0; | |
1301 | ||
1302 | DEBUG ("[frame] sniffed tailcall frame for %s on level %d", | |
1303 | btrace_get_bfun_name (bfun), bfun->level); | |
1304 | ||
1305 | /* This is our frame. Initialize the frame cache. */ | |
1306 | cache = bfcache_new (this_frame); | |
1307 | cache->tp = find_thread_ptid (inferior_ptid); | |
1308 | cache->bfun = bfun; | |
1309 | ||
1310 | *this_cache = cache; | |
1311 | return 1; | |
1312 | } | |
1313 | ||
1314 | static void | |
1315 | record_btrace_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
1316 | { | |
1317 | struct btrace_frame_cache *cache; | |
1318 | void **slot; | |
1319 | ||
1320 | cache = this_cache; | |
1321 | ||
1322 | slot = htab_find_slot (bfcache, cache, NO_INSERT); | |
1323 | gdb_assert (slot != NULL); | |
1324 | ||
1325 | htab_remove_elt (bfcache, cache); | |
cecac1ab MM |
1326 | } |
1327 | ||
1328 | /* btrace recording does not store previous memory content, neither the stack | |
1329 | frames content. Any unwinding would return errorneous results as the stack | |
1330 | contents no longer matches the changed PC value restored from history. | |
1331 | Therefore this unwinder reports any possibly unwound registers as | |
1332 | <unavailable>. */ | |
1333 | ||
0b722aec | 1334 | const struct frame_unwind record_btrace_frame_unwind = |
cecac1ab MM |
1335 | { |
1336 | NORMAL_FRAME, | |
1337 | record_btrace_frame_unwind_stop_reason, | |
1338 | record_btrace_frame_this_id, | |
1339 | record_btrace_frame_prev_register, | |
1340 | NULL, | |
0b722aec MM |
1341 | record_btrace_frame_sniffer, |
1342 | record_btrace_frame_dealloc_cache | |
1343 | }; | |
1344 | ||
1345 | const struct frame_unwind record_btrace_tailcall_frame_unwind = | |
1346 | { | |
1347 | TAILCALL_FRAME, | |
1348 | record_btrace_frame_unwind_stop_reason, | |
1349 | record_btrace_frame_this_id, | |
1350 | record_btrace_frame_prev_register, | |
1351 | NULL, | |
1352 | record_btrace_tailcall_frame_sniffer, | |
1353 | record_btrace_frame_dealloc_cache | |
cecac1ab | 1354 | }; |
b2f4cfde | 1355 | |
ac01945b TT |
1356 | /* Implement the to_get_unwinder method. */ |
1357 | ||
1358 | static const struct frame_unwind * | |
1359 | record_btrace_to_get_unwinder (struct target_ops *self) | |
1360 | { | |
1361 | return &record_btrace_frame_unwind; | |
1362 | } | |
1363 | ||
1364 | /* Implement the to_get_tailcall_unwinder method. */ | |
1365 | ||
1366 | static const struct frame_unwind * | |
1367 | record_btrace_to_get_tailcall_unwinder (struct target_ops *self) | |
1368 | { | |
1369 | return &record_btrace_tailcall_frame_unwind; | |
1370 | } | |
1371 | ||
52834460 MM |
1372 | /* Indicate that TP should be resumed according to FLAG. */ |
1373 | ||
1374 | static void | |
1375 | record_btrace_resume_thread (struct thread_info *tp, | |
1376 | enum btrace_thread_flag flag) | |
1377 | { | |
1378 | struct btrace_thread_info *btinfo; | |
1379 | ||
1380 | DEBUG ("resuming %d (%s): %u", tp->num, target_pid_to_str (tp->ptid), flag); | |
1381 | ||
1382 | btinfo = &tp->btrace; | |
1383 | ||
1384 | if ((btinfo->flags & BTHR_MOVE) != 0) | |
1385 | error (_("Thread already moving.")); | |
1386 | ||
1387 | /* Fetch the latest branch trace. */ | |
1388 | btrace_fetch (tp); | |
1389 | ||
1390 | btinfo->flags |= flag; | |
1391 | } | |
1392 | ||
1393 | /* Find the thread to resume given a PTID. */ | |
1394 | ||
1395 | static struct thread_info * | |
1396 | record_btrace_find_resume_thread (ptid_t ptid) | |
1397 | { | |
1398 | struct thread_info *tp; | |
1399 | ||
1400 | /* When asked to resume everything, we pick the current thread. */ | |
1401 | if (ptid_equal (minus_one_ptid, ptid) || ptid_is_pid (ptid)) | |
1402 | ptid = inferior_ptid; | |
1403 | ||
1404 | return find_thread_ptid (ptid); | |
1405 | } | |
1406 | ||
1407 | /* Start replaying a thread. */ | |
1408 | ||
1409 | static struct btrace_insn_iterator * | |
1410 | record_btrace_start_replaying (struct thread_info *tp) | |
1411 | { | |
1412 | volatile struct gdb_exception except; | |
1413 | struct btrace_insn_iterator *replay; | |
1414 | struct btrace_thread_info *btinfo; | |
1415 | int executing; | |
1416 | ||
1417 | btinfo = &tp->btrace; | |
1418 | replay = NULL; | |
1419 | ||
1420 | /* We can't start replaying without trace. */ | |
1421 | if (btinfo->begin == NULL) | |
1422 | return NULL; | |
1423 | ||
1424 | /* Clear the executing flag to allow changes to the current frame. | |
1425 | We are not actually running, yet. We just started a reverse execution | |
1426 | command or a record goto command. | |
1427 | For the latter, EXECUTING is false and this has no effect. | |
1428 | For the former, EXECUTING is true and we're in to_wait, about to | |
1429 | move the thread. Since we need to recompute the stack, we temporarily | |
1430 | set EXECUTING to flase. */ | |
1431 | executing = is_executing (tp->ptid); | |
1432 | set_executing (tp->ptid, 0); | |
1433 | ||
1434 | /* GDB stores the current frame_id when stepping in order to detects steps | |
1435 | into subroutines. | |
1436 | Since frames are computed differently when we're replaying, we need to | |
1437 | recompute those stored frames and fix them up so we can still detect | |
1438 | subroutines after we started replaying. */ | |
1439 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1440 | { | |
1441 | struct frame_info *frame; | |
1442 | struct frame_id frame_id; | |
1443 | int upd_step_frame_id, upd_step_stack_frame_id; | |
1444 | ||
1445 | /* The current frame without replaying - computed via normal unwind. */ | |
1446 | frame = get_current_frame (); | |
1447 | frame_id = get_frame_id (frame); | |
1448 | ||
1449 | /* Check if we need to update any stepping-related frame id's. */ | |
1450 | upd_step_frame_id = frame_id_eq (frame_id, | |
1451 | tp->control.step_frame_id); | |
1452 | upd_step_stack_frame_id = frame_id_eq (frame_id, | |
1453 | tp->control.step_stack_frame_id); | |
1454 | ||
1455 | /* We start replaying at the end of the branch trace. This corresponds | |
1456 | to the current instruction. */ | |
1457 | replay = xmalloc (sizeof (*replay)); | |
1458 | btrace_insn_end (replay, btinfo); | |
1459 | ||
1460 | /* We're not replaying, yet. */ | |
1461 | gdb_assert (btinfo->replay == NULL); | |
1462 | btinfo->replay = replay; | |
1463 | ||
1464 | /* Make sure we're not using any stale registers. */ | |
1465 | registers_changed_ptid (tp->ptid); | |
1466 | ||
1467 | /* The current frame with replaying - computed via btrace unwind. */ | |
1468 | frame = get_current_frame (); | |
1469 | frame_id = get_frame_id (frame); | |
1470 | ||
1471 | /* Replace stepping related frames where necessary. */ | |
1472 | if (upd_step_frame_id) | |
1473 | tp->control.step_frame_id = frame_id; | |
1474 | if (upd_step_stack_frame_id) | |
1475 | tp->control.step_stack_frame_id = frame_id; | |
1476 | } | |
1477 | ||
1478 | /* Restore the previous execution state. */ | |
1479 | set_executing (tp->ptid, executing); | |
1480 | ||
1481 | if (except.reason < 0) | |
1482 | { | |
1483 | xfree (btinfo->replay); | |
1484 | btinfo->replay = NULL; | |
1485 | ||
1486 | registers_changed_ptid (tp->ptid); | |
1487 | ||
1488 | throw_exception (except); | |
1489 | } | |
1490 | ||
1491 | return replay; | |
1492 | } | |
1493 | ||
1494 | /* Stop replaying a thread. */ | |
1495 | ||
1496 | static void | |
1497 | record_btrace_stop_replaying (struct thread_info *tp) | |
1498 | { | |
1499 | struct btrace_thread_info *btinfo; | |
1500 | ||
1501 | btinfo = &tp->btrace; | |
1502 | ||
1503 | xfree (btinfo->replay); | |
1504 | btinfo->replay = NULL; | |
1505 | ||
1506 | /* Make sure we're not leaving any stale registers. */ | |
1507 | registers_changed_ptid (tp->ptid); | |
1508 | } | |
1509 | ||
b2f4cfde MM |
1510 | /* The to_resume method of target record-btrace. */ |
1511 | ||
1512 | static void | |
1513 | record_btrace_resume (struct target_ops *ops, ptid_t ptid, int step, | |
1514 | enum gdb_signal signal) | |
1515 | { | |
52834460 MM |
1516 | struct thread_info *tp, *other; |
1517 | enum btrace_thread_flag flag; | |
1518 | ||
1519 | DEBUG ("resume %s: %s", target_pid_to_str (ptid), step ? "step" : "cont"); | |
1520 | ||
70ad5bff MM |
1521 | /* Store the execution direction of the last resume. */ |
1522 | record_btrace_resume_exec_dir = execution_direction; | |
1523 | ||
52834460 MM |
1524 | tp = record_btrace_find_resume_thread (ptid); |
1525 | if (tp == NULL) | |
1526 | error (_("Cannot find thread to resume.")); | |
1527 | ||
1528 | /* Stop replaying other threads if the thread to resume is not replaying. */ | |
1529 | if (!btrace_is_replaying (tp) && execution_direction != EXEC_REVERSE) | |
034f788c | 1530 | ALL_NON_EXITED_THREADS (other) |
52834460 MM |
1531 | record_btrace_stop_replaying (other); |
1532 | ||
b2f4cfde | 1533 | /* As long as we're not replaying, just forward the request. */ |
1c63c994 | 1534 | if (!record_btrace_is_replaying (ops) && execution_direction != EXEC_REVERSE) |
b2f4cfde MM |
1535 | { |
1536 | for (ops = ops->beneath; ops != NULL; ops = ops->beneath) | |
1537 | if (ops->to_resume != NULL) | |
1538 | return ops->to_resume (ops, ptid, step, signal); | |
1539 | ||
1540 | error (_("Cannot find target for stepping.")); | |
1541 | } | |
1542 | ||
52834460 MM |
1543 | /* Compute the btrace thread flag for the requested move. */ |
1544 | if (step == 0) | |
1545 | flag = execution_direction == EXEC_REVERSE ? BTHR_RCONT : BTHR_CONT; | |
1546 | else | |
1547 | flag = execution_direction == EXEC_REVERSE ? BTHR_RSTEP : BTHR_STEP; | |
1548 | ||
1549 | /* At the moment, we only move a single thread. We could also move | |
1550 | all threads in parallel by single-stepping each resumed thread | |
1551 | until the first runs into an event. | |
1552 | When we do that, we would want to continue all other threads. | |
1553 | For now, just resume one thread to not confuse to_wait. */ | |
1554 | record_btrace_resume_thread (tp, flag); | |
1555 | ||
1556 | /* We just indicate the resume intent here. The actual stepping happens in | |
1557 | record_btrace_wait below. */ | |
70ad5bff MM |
1558 | |
1559 | /* Async support. */ | |
1560 | if (target_can_async_p ()) | |
1561 | { | |
1562 | target_async (inferior_event_handler, 0); | |
1563 | mark_async_event_handler (record_btrace_async_inferior_event_handler); | |
1564 | } | |
52834460 MM |
1565 | } |
1566 | ||
1567 | /* Find a thread to move. */ | |
1568 | ||
1569 | static struct thread_info * | |
1570 | record_btrace_find_thread_to_move (ptid_t ptid) | |
1571 | { | |
1572 | struct thread_info *tp; | |
1573 | ||
1574 | /* First check the parameter thread. */ | |
1575 | tp = find_thread_ptid (ptid); | |
1576 | if (tp != NULL && (tp->btrace.flags & BTHR_MOVE) != 0) | |
1577 | return tp; | |
1578 | ||
1579 | /* Otherwise, find one other thread that has been resumed. */ | |
034f788c | 1580 | ALL_NON_EXITED_THREADS (tp) |
52834460 MM |
1581 | if ((tp->btrace.flags & BTHR_MOVE) != 0) |
1582 | return tp; | |
1583 | ||
1584 | return NULL; | |
1585 | } | |
1586 | ||
1587 | /* Return a target_waitstatus indicating that we ran out of history. */ | |
1588 | ||
1589 | static struct target_waitstatus | |
1590 | btrace_step_no_history (void) | |
1591 | { | |
1592 | struct target_waitstatus status; | |
1593 | ||
1594 | status.kind = TARGET_WAITKIND_NO_HISTORY; | |
1595 | ||
1596 | return status; | |
1597 | } | |
1598 | ||
1599 | /* Return a target_waitstatus indicating that a step finished. */ | |
1600 | ||
1601 | static struct target_waitstatus | |
1602 | btrace_step_stopped (void) | |
1603 | { | |
1604 | struct target_waitstatus status; | |
1605 | ||
1606 | status.kind = TARGET_WAITKIND_STOPPED; | |
1607 | status.value.sig = GDB_SIGNAL_TRAP; | |
1608 | ||
1609 | return status; | |
1610 | } | |
1611 | ||
1612 | /* Clear the record histories. */ | |
1613 | ||
1614 | static void | |
1615 | record_btrace_clear_histories (struct btrace_thread_info *btinfo) | |
1616 | { | |
1617 | xfree (btinfo->insn_history); | |
1618 | xfree (btinfo->call_history); | |
1619 | ||
1620 | btinfo->insn_history = NULL; | |
1621 | btinfo->call_history = NULL; | |
1622 | } | |
1623 | ||
1624 | /* Step a single thread. */ | |
1625 | ||
1626 | static struct target_waitstatus | |
1627 | record_btrace_step_thread (struct thread_info *tp) | |
1628 | { | |
1629 | struct btrace_insn_iterator *replay, end; | |
1630 | struct btrace_thread_info *btinfo; | |
1631 | struct address_space *aspace; | |
1632 | struct inferior *inf; | |
1633 | enum btrace_thread_flag flags; | |
1634 | unsigned int steps; | |
1635 | ||
e59fa00f MM |
1636 | /* We can't step without an execution history. */ |
1637 | if (btrace_is_empty (tp)) | |
1638 | return btrace_step_no_history (); | |
1639 | ||
52834460 MM |
1640 | btinfo = &tp->btrace; |
1641 | replay = btinfo->replay; | |
1642 | ||
1643 | flags = btinfo->flags & BTHR_MOVE; | |
1644 | btinfo->flags &= ~BTHR_MOVE; | |
1645 | ||
1646 | DEBUG ("stepping %d (%s): %u", tp->num, target_pid_to_str (tp->ptid), flags); | |
1647 | ||
1648 | switch (flags) | |
1649 | { | |
1650 | default: | |
1651 | internal_error (__FILE__, __LINE__, _("invalid stepping type.")); | |
1652 | ||
1653 | case BTHR_STEP: | |
1654 | /* We're done if we're not replaying. */ | |
1655 | if (replay == NULL) | |
1656 | return btrace_step_no_history (); | |
1657 | ||
1658 | /* We are always able to step at least once. */ | |
1659 | steps = btrace_insn_next (replay, 1); | |
1660 | gdb_assert (steps == 1); | |
1661 | ||
1662 | /* Determine the end of the instruction trace. */ | |
1663 | btrace_insn_end (&end, btinfo); | |
1664 | ||
1665 | /* We stop replaying if we reached the end of the trace. */ | |
1666 | if (btrace_insn_cmp (replay, &end) == 0) | |
1667 | record_btrace_stop_replaying (tp); | |
1668 | ||
1669 | return btrace_step_stopped (); | |
1670 | ||
1671 | case BTHR_RSTEP: | |
1672 | /* Start replaying if we're not already doing so. */ | |
1673 | if (replay == NULL) | |
1674 | replay = record_btrace_start_replaying (tp); | |
1675 | ||
1676 | /* If we can't step any further, we reached the end of the history. */ | |
1677 | steps = btrace_insn_prev (replay, 1); | |
1678 | if (steps == 0) | |
1679 | return btrace_step_no_history (); | |
1680 | ||
1681 | return btrace_step_stopped (); | |
1682 | ||
1683 | case BTHR_CONT: | |
1684 | /* We're done if we're not replaying. */ | |
1685 | if (replay == NULL) | |
1686 | return btrace_step_no_history (); | |
1687 | ||
1688 | inf = find_inferior_pid (ptid_get_pid (tp->ptid)); | |
1689 | aspace = inf->aspace; | |
1690 | ||
1691 | /* Determine the end of the instruction trace. */ | |
1692 | btrace_insn_end (&end, btinfo); | |
1693 | ||
1694 | for (;;) | |
1695 | { | |
1696 | const struct btrace_insn *insn; | |
1697 | ||
1698 | /* We are always able to step at least once. */ | |
1699 | steps = btrace_insn_next (replay, 1); | |
1700 | gdb_assert (steps == 1); | |
1701 | ||
1702 | /* We stop replaying if we reached the end of the trace. */ | |
1703 | if (btrace_insn_cmp (replay, &end) == 0) | |
1704 | { | |
1705 | record_btrace_stop_replaying (tp); | |
1706 | return btrace_step_no_history (); | |
1707 | } | |
1708 | ||
1709 | insn = btrace_insn_get (replay); | |
1710 | gdb_assert (insn); | |
1711 | ||
1712 | DEBUG ("stepping %d (%s) ... %s", tp->num, | |
1713 | target_pid_to_str (tp->ptid), | |
1714 | core_addr_to_string_nz (insn->pc)); | |
1715 | ||
1716 | if (breakpoint_here_p (aspace, insn->pc)) | |
1717 | return btrace_step_stopped (); | |
1718 | } | |
1719 | ||
1720 | case BTHR_RCONT: | |
1721 | /* Start replaying if we're not already doing so. */ | |
1722 | if (replay == NULL) | |
1723 | replay = record_btrace_start_replaying (tp); | |
1724 | ||
1725 | inf = find_inferior_pid (ptid_get_pid (tp->ptid)); | |
1726 | aspace = inf->aspace; | |
1727 | ||
1728 | for (;;) | |
1729 | { | |
1730 | const struct btrace_insn *insn; | |
1731 | ||
1732 | /* If we can't step any further, we're done. */ | |
1733 | steps = btrace_insn_prev (replay, 1); | |
1734 | if (steps == 0) | |
1735 | return btrace_step_no_history (); | |
1736 | ||
1737 | insn = btrace_insn_get (replay); | |
1738 | gdb_assert (insn); | |
1739 | ||
1740 | DEBUG ("reverse-stepping %d (%s) ... %s", tp->num, | |
1741 | target_pid_to_str (tp->ptid), | |
1742 | core_addr_to_string_nz (insn->pc)); | |
1743 | ||
1744 | if (breakpoint_here_p (aspace, insn->pc)) | |
1745 | return btrace_step_stopped (); | |
1746 | } | |
1747 | } | |
b2f4cfde MM |
1748 | } |
1749 | ||
1750 | /* The to_wait method of target record-btrace. */ | |
1751 | ||
1752 | static ptid_t | |
1753 | record_btrace_wait (struct target_ops *ops, ptid_t ptid, | |
1754 | struct target_waitstatus *status, int options) | |
1755 | { | |
52834460 MM |
1756 | struct thread_info *tp, *other; |
1757 | ||
1758 | DEBUG ("wait %s (0x%x)", target_pid_to_str (ptid), options); | |
1759 | ||
b2f4cfde | 1760 | /* As long as we're not replaying, just forward the request. */ |
1c63c994 | 1761 | if (!record_btrace_is_replaying (ops) && execution_direction != EXEC_REVERSE) |
b2f4cfde MM |
1762 | { |
1763 | for (ops = ops->beneath; ops != NULL; ops = ops->beneath) | |
1764 | if (ops->to_wait != NULL) | |
1765 | return ops->to_wait (ops, ptid, status, options); | |
1766 | ||
1767 | error (_("Cannot find target for waiting.")); | |
1768 | } | |
1769 | ||
52834460 MM |
1770 | /* Let's find a thread to move. */ |
1771 | tp = record_btrace_find_thread_to_move (ptid); | |
1772 | if (tp == NULL) | |
1773 | { | |
1774 | DEBUG ("wait %s: no thread", target_pid_to_str (ptid)); | |
1775 | ||
1776 | status->kind = TARGET_WAITKIND_IGNORE; | |
1777 | return minus_one_ptid; | |
1778 | } | |
1779 | ||
1780 | /* We only move a single thread. We're not able to correlate threads. */ | |
1781 | *status = record_btrace_step_thread (tp); | |
1782 | ||
1783 | /* Stop all other threads. */ | |
1784 | if (!non_stop) | |
034f788c | 1785 | ALL_NON_EXITED_THREADS (other) |
52834460 MM |
1786 | other->btrace.flags &= ~BTHR_MOVE; |
1787 | ||
1788 | /* Start record histories anew from the current position. */ | |
1789 | record_btrace_clear_histories (&tp->btrace); | |
1790 | ||
1791 | /* We moved the replay position but did not update registers. */ | |
1792 | registers_changed_ptid (tp->ptid); | |
1793 | ||
1794 | return tp->ptid; | |
1795 | } | |
1796 | ||
1797 | /* The to_can_execute_reverse method of target record-btrace. */ | |
1798 | ||
1799 | static int | |
19db3e69 | 1800 | record_btrace_can_execute_reverse (struct target_ops *self) |
52834460 MM |
1801 | { |
1802 | return 1; | |
1803 | } | |
1804 | ||
1805 | /* The to_decr_pc_after_break method of target record-btrace. */ | |
1806 | ||
1807 | static CORE_ADDR | |
1808 | record_btrace_decr_pc_after_break (struct target_ops *ops, | |
1809 | struct gdbarch *gdbarch) | |
1810 | { | |
1811 | /* When replaying, we do not actually execute the breakpoint instruction | |
1812 | so there is no need to adjust the PC after hitting a breakpoint. */ | |
1c63c994 | 1813 | if (record_btrace_is_replaying (ops)) |
52834460 MM |
1814 | return 0; |
1815 | ||
c0eca49f | 1816 | return ops->beneath->to_decr_pc_after_break (ops->beneath, gdbarch); |
b2f4cfde MM |
1817 | } |
1818 | ||
e2887aa3 MM |
1819 | /* The to_find_new_threads method of target record-btrace. */ |
1820 | ||
1821 | static void | |
1822 | record_btrace_find_new_threads (struct target_ops *ops) | |
1823 | { | |
1824 | /* Don't expect new threads if we're replaying. */ | |
1c63c994 | 1825 | if (record_btrace_is_replaying (ops)) |
e2887aa3 MM |
1826 | return; |
1827 | ||
1828 | /* Forward the request. */ | |
1829 | for (ops = ops->beneath; ops != NULL; ops = ops->beneath) | |
1830 | if (ops->to_find_new_threads != NULL) | |
1831 | { | |
1832 | ops->to_find_new_threads (ops); | |
1833 | break; | |
1834 | } | |
1835 | } | |
1836 | ||
1837 | /* The to_thread_alive method of target record-btrace. */ | |
1838 | ||
1839 | static int | |
1840 | record_btrace_thread_alive (struct target_ops *ops, ptid_t ptid) | |
1841 | { | |
1842 | /* We don't add or remove threads during replay. */ | |
1c63c994 | 1843 | if (record_btrace_is_replaying (ops)) |
e2887aa3 MM |
1844 | return find_thread_ptid (ptid) != NULL; |
1845 | ||
1846 | /* Forward the request. */ | |
1847 | for (ops = ops->beneath; ops != NULL; ops = ops->beneath) | |
1848 | if (ops->to_thread_alive != NULL) | |
1849 | return ops->to_thread_alive (ops, ptid); | |
1850 | ||
1851 | return 0; | |
1852 | } | |
1853 | ||
066ce621 MM |
1854 | /* Set the replay branch trace instruction iterator. If IT is NULL, replay |
1855 | is stopped. */ | |
1856 | ||
1857 | static void | |
1858 | record_btrace_set_replay (struct thread_info *tp, | |
1859 | const struct btrace_insn_iterator *it) | |
1860 | { | |
1861 | struct btrace_thread_info *btinfo; | |
1862 | ||
1863 | btinfo = &tp->btrace; | |
1864 | ||
1865 | if (it == NULL || it->function == NULL) | |
52834460 | 1866 | record_btrace_stop_replaying (tp); |
066ce621 MM |
1867 | else |
1868 | { | |
1869 | if (btinfo->replay == NULL) | |
52834460 | 1870 | record_btrace_start_replaying (tp); |
066ce621 MM |
1871 | else if (btrace_insn_cmp (btinfo->replay, it) == 0) |
1872 | return; | |
1873 | ||
1874 | *btinfo->replay = *it; | |
52834460 | 1875 | registers_changed_ptid (tp->ptid); |
066ce621 MM |
1876 | } |
1877 | ||
52834460 MM |
1878 | /* Start anew from the new replay position. */ |
1879 | record_btrace_clear_histories (btinfo); | |
066ce621 MM |
1880 | } |
1881 | ||
1882 | /* The to_goto_record_begin method of target record-btrace. */ | |
1883 | ||
1884 | static void | |
08475817 | 1885 | record_btrace_goto_begin (struct target_ops *self) |
066ce621 MM |
1886 | { |
1887 | struct thread_info *tp; | |
1888 | struct btrace_insn_iterator begin; | |
1889 | ||
1890 | tp = require_btrace_thread (); | |
1891 | ||
1892 | btrace_insn_begin (&begin, &tp->btrace); | |
1893 | record_btrace_set_replay (tp, &begin); | |
1894 | ||
1895 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); | |
1896 | } | |
1897 | ||
1898 | /* The to_goto_record_end method of target record-btrace. */ | |
1899 | ||
1900 | static void | |
307a1b91 | 1901 | record_btrace_goto_end (struct target_ops *ops) |
066ce621 MM |
1902 | { |
1903 | struct thread_info *tp; | |
1904 | ||
1905 | tp = require_btrace_thread (); | |
1906 | ||
1907 | record_btrace_set_replay (tp, NULL); | |
1908 | ||
1909 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); | |
1910 | } | |
1911 | ||
1912 | /* The to_goto_record method of target record-btrace. */ | |
1913 | ||
1914 | static void | |
606183ac | 1915 | record_btrace_goto (struct target_ops *self, ULONGEST insn) |
066ce621 MM |
1916 | { |
1917 | struct thread_info *tp; | |
1918 | struct btrace_insn_iterator it; | |
1919 | unsigned int number; | |
1920 | int found; | |
1921 | ||
1922 | number = insn; | |
1923 | ||
1924 | /* Check for wrap-arounds. */ | |
1925 | if (number != insn) | |
1926 | error (_("Instruction number out of range.")); | |
1927 | ||
1928 | tp = require_btrace_thread (); | |
1929 | ||
1930 | found = btrace_find_insn_by_number (&it, &tp->btrace, number); | |
1931 | if (found == 0) | |
1932 | error (_("No such instruction.")); | |
1933 | ||
1934 | record_btrace_set_replay (tp, &it); | |
1935 | ||
1936 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); | |
1937 | } | |
1938 | ||
70ad5bff MM |
1939 | /* The to_execution_direction target method. */ |
1940 | ||
1941 | static enum exec_direction_kind | |
1942 | record_btrace_execution_direction (struct target_ops *self) | |
1943 | { | |
1944 | return record_btrace_resume_exec_dir; | |
1945 | } | |
1946 | ||
aef92902 MM |
1947 | /* The to_prepare_to_generate_core target method. */ |
1948 | ||
1949 | static void | |
1950 | record_btrace_prepare_to_generate_core (struct target_ops *self) | |
1951 | { | |
1952 | record_btrace_generating_corefile = 1; | |
1953 | } | |
1954 | ||
1955 | /* The to_done_generating_core target method. */ | |
1956 | ||
1957 | static void | |
1958 | record_btrace_done_generating_core (struct target_ops *self) | |
1959 | { | |
1960 | record_btrace_generating_corefile = 0; | |
1961 | } | |
1962 | ||
afedecd3 MM |
1963 | /* Initialize the record-btrace target ops. */ |
1964 | ||
1965 | static void | |
1966 | init_record_btrace_ops (void) | |
1967 | { | |
1968 | struct target_ops *ops; | |
1969 | ||
1970 | ops = &record_btrace_ops; | |
1971 | ops->to_shortname = "record-btrace"; | |
1972 | ops->to_longname = "Branch tracing target"; | |
1973 | ops->to_doc = "Collect control-flow trace and provide the execution history."; | |
1974 | ops->to_open = record_btrace_open; | |
1975 | ops->to_close = record_btrace_close; | |
1976 | ops->to_detach = record_detach; | |
1977 | ops->to_disconnect = record_disconnect; | |
1978 | ops->to_mourn_inferior = record_mourn_inferior; | |
1979 | ops->to_kill = record_kill; | |
afedecd3 MM |
1980 | ops->to_stop_recording = record_btrace_stop_recording; |
1981 | ops->to_info_record = record_btrace_info; | |
1982 | ops->to_insn_history = record_btrace_insn_history; | |
1983 | ops->to_insn_history_from = record_btrace_insn_history_from; | |
1984 | ops->to_insn_history_range = record_btrace_insn_history_range; | |
1985 | ops->to_call_history = record_btrace_call_history; | |
1986 | ops->to_call_history_from = record_btrace_call_history_from; | |
1987 | ops->to_call_history_range = record_btrace_call_history_range; | |
07bbe694 | 1988 | ops->to_record_is_replaying = record_btrace_is_replaying; |
633785ff MM |
1989 | ops->to_xfer_partial = record_btrace_xfer_partial; |
1990 | ops->to_remove_breakpoint = record_btrace_remove_breakpoint; | |
1991 | ops->to_insert_breakpoint = record_btrace_insert_breakpoint; | |
1f3ef581 MM |
1992 | ops->to_fetch_registers = record_btrace_fetch_registers; |
1993 | ops->to_store_registers = record_btrace_store_registers; | |
1994 | ops->to_prepare_to_store = record_btrace_prepare_to_store; | |
ac01945b TT |
1995 | ops->to_get_unwinder = &record_btrace_to_get_unwinder; |
1996 | ops->to_get_tailcall_unwinder = &record_btrace_to_get_tailcall_unwinder; | |
b2f4cfde MM |
1997 | ops->to_resume = record_btrace_resume; |
1998 | ops->to_wait = record_btrace_wait; | |
e2887aa3 MM |
1999 | ops->to_find_new_threads = record_btrace_find_new_threads; |
2000 | ops->to_thread_alive = record_btrace_thread_alive; | |
066ce621 MM |
2001 | ops->to_goto_record_begin = record_btrace_goto_begin; |
2002 | ops->to_goto_record_end = record_btrace_goto_end; | |
2003 | ops->to_goto_record = record_btrace_goto; | |
52834460 MM |
2004 | ops->to_can_execute_reverse = record_btrace_can_execute_reverse; |
2005 | ops->to_decr_pc_after_break = record_btrace_decr_pc_after_break; | |
70ad5bff | 2006 | ops->to_execution_direction = record_btrace_execution_direction; |
aef92902 MM |
2007 | ops->to_prepare_to_generate_core = record_btrace_prepare_to_generate_core; |
2008 | ops->to_done_generating_core = record_btrace_done_generating_core; | |
afedecd3 MM |
2009 | ops->to_stratum = record_stratum; |
2010 | ops->to_magic = OPS_MAGIC; | |
2011 | } | |
2012 | ||
2013 | /* Alias for "target record". */ | |
2014 | ||
2015 | static void | |
2016 | cmd_record_btrace_start (char *args, int from_tty) | |
2017 | { | |
2018 | if (args != NULL && *args != 0) | |
2019 | error (_("Invalid argument.")); | |
2020 | ||
2021 | execute_command ("target record-btrace", from_tty); | |
2022 | } | |
2023 | ||
67b5c0c1 MM |
2024 | /* The "set record btrace" command. */ |
2025 | ||
2026 | static void | |
2027 | cmd_set_record_btrace (char *args, int from_tty) | |
2028 | { | |
2029 | cmd_show_list (set_record_btrace_cmdlist, from_tty, ""); | |
2030 | } | |
2031 | ||
2032 | /* The "show record btrace" command. */ | |
2033 | ||
2034 | static void | |
2035 | cmd_show_record_btrace (char *args, int from_tty) | |
2036 | { | |
2037 | cmd_show_list (show_record_btrace_cmdlist, from_tty, ""); | |
2038 | } | |
2039 | ||
2040 | /* The "show record btrace replay-memory-access" command. */ | |
2041 | ||
2042 | static void | |
2043 | cmd_show_replay_memory_access (struct ui_file *file, int from_tty, | |
2044 | struct cmd_list_element *c, const char *value) | |
2045 | { | |
2046 | fprintf_filtered (gdb_stdout, _("Replay memory access is %s.\n"), | |
2047 | replay_memory_access); | |
2048 | } | |
2049 | ||
afedecd3 MM |
2050 | void _initialize_record_btrace (void); |
2051 | ||
2052 | /* Initialize btrace commands. */ | |
2053 | ||
2054 | void | |
2055 | _initialize_record_btrace (void) | |
2056 | { | |
2057 | add_cmd ("btrace", class_obscure, cmd_record_btrace_start, | |
2058 | _("Start branch trace recording."), | |
2059 | &record_cmdlist); | |
2060 | add_alias_cmd ("b", "btrace", class_obscure, 1, &record_cmdlist); | |
2061 | ||
67b5c0c1 MM |
2062 | add_prefix_cmd ("btrace", class_support, cmd_set_record_btrace, |
2063 | _("Set record options"), &set_record_btrace_cmdlist, | |
2064 | "set record btrace ", 0, &set_record_cmdlist); | |
2065 | ||
2066 | add_prefix_cmd ("btrace", class_support, cmd_show_record_btrace, | |
2067 | _("Show record options"), &show_record_btrace_cmdlist, | |
2068 | "show record btrace ", 0, &show_record_cmdlist); | |
2069 | ||
2070 | add_setshow_enum_cmd ("replay-memory-access", no_class, | |
2071 | replay_memory_access_types, &replay_memory_access, _("\ | |
2072 | Set what memory accesses are allowed during replay."), _("\ | |
2073 | Show what memory accesses are allowed during replay."), | |
2074 | _("Default is READ-ONLY.\n\n\ | |
2075 | The btrace record target does not trace data.\n\ | |
2076 | The memory therefore corresponds to the live target and not \ | |
2077 | to the current replay position.\n\n\ | |
2078 | When READ-ONLY, allow accesses to read-only memory during replay.\n\ | |
2079 | When READ-WRITE, allow accesses to read-only and read-write memory during \ | |
2080 | replay."), | |
2081 | NULL, cmd_show_replay_memory_access, | |
2082 | &set_record_btrace_cmdlist, | |
2083 | &show_record_btrace_cmdlist); | |
2084 | ||
afedecd3 MM |
2085 | init_record_btrace_ops (); |
2086 | add_target (&record_btrace_ops); | |
0b722aec MM |
2087 | |
2088 | bfcache = htab_create_alloc (50, bfcache_hash, bfcache_eq, NULL, | |
2089 | xcalloc, xfree); | |
afedecd3 | 2090 | } |