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