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