gdb/record.c

   1 /* Process record and replay target for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2024 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "gdbcmd.h"
  22 #include "completer.h"
  23 #include "record.h"
  24 #include "observable.h"
  25 #include "inferior.h"
  26 #include "gdbsupport/common-utils.h"
  27 #include "cli/cli-utils.h"
  28 #include "disasm.h"
  29 #include "interps.h"
  30
  31 #include <ctype.h>
  32
  33 /* This is the debug switch for process record.  */
  34 unsigned int record_debug = 0;
  35
  36 /* The number of instructions to print in "record instruction-history".  */
  37 static unsigned int record_insn_history_size = 10;
  38
  39 /* The variable registered as control variable in the "record
  40    instruction-history" command.  Necessary for extra input
  41    validation.  */
  42 static unsigned int record_insn_history_size_setshow_var;
  43
  44 /* The number of functions to print in "record function-call-history".  */
  45 static unsigned int record_call_history_size = 10;
  46
  47 /* The variable registered as control variable in the "record
  48    call-history" command.  Necessary for extra input validation.  */
  49 static unsigned int record_call_history_size_setshow_var;
  50
  51 struct cmd_list_element *record_cmdlist = NULL;
  52 static struct cmd_list_element *record_goto_cmdlist = NULL;
  53 struct cmd_list_element *set_record_cmdlist = NULL;
  54 struct cmd_list_element *show_record_cmdlist = NULL;
  55 struct cmd_list_element *info_record_cmdlist = NULL;
  56
  57 #define DEBUG(msg, args...)                                             \
  58   if (record_debug)                                                     \
  59     gdb_printf (gdb_stdlog, "record: " msg "\n", ##args)
  60
  61 /* See record.h.  */
  62
  63 struct target_ops *
  64 find_record_target (void)
  65 {
  66   return find_target_at (record_stratum);
  67 }
  68
  69 /* Check that recording is active.  Throw an error, if it isn't.  */
  70
  71 static struct target_ops *
  72 require_record_target (void)
  73 {
  74   struct target_ops *t;
  75
  76   t = find_record_target ();
  77   if (t == NULL)
  78     error (_("No recording is currently active.\n"
  79              "Use the \"record full\" or \"record btrace\" command first."));
  80
  81   return t;
  82 }
  83
  84 /* See record.h.  */
  85
  86 void
  87 record_preopen (void)
  88 {
  89   /* Check if a record target is already running.  */
  90   if (find_record_target () != NULL)
  91     error (_("The process is already being recorded.  Use \"record stop\" to "
  92              "stop recording first."));
  93 }
  94
  95 /* See record.h.  */
  96
  97 void
  98 record_start (const char *method, const char *format, int from_tty)
  99 {
 100   if (method == NULL)
 101     {
 102       if (format == NULL)
 103         execute_command_to_string ("record", from_tty, false);
 104       else
 105         error (_("Invalid format."));
 106     }
 107   else if (strcmp (method, "full") == 0)
 108     {
 109       if (format == NULL)
 110         execute_command_to_string ("record full", from_tty, false);
 111       else
 112         error (_("Invalid format."));
 113     }
 114   else if (strcmp (method, "btrace") == 0)
 115     {
 116       if (format == NULL)
 117         execute_command_to_string ("record btrace", from_tty, false);
 118       else if (strcmp (format, "bts") == 0)
 119         execute_command_to_string ("record btrace bts", from_tty, false);
 120       else if (strcmp (format, "pt") == 0)
 121         execute_command_to_string ("record btrace pt", from_tty, false);
 122       else
 123         error (_("Invalid format."));
 124     }
 125   else
 126     error (_("Invalid method."));
 127 }
 128
 129 /* See record.h.  */
 130
 131 void
 132 record_stop (int from_tty)
 133 {
 134   execute_command_to_string ("record stop", from_tty, false);
 135 }
 136
 137 /* See record.h.  */
 138
 139 int
 140 record_read_memory (struct gdbarch *gdbarch,
 141                     CORE_ADDR memaddr, gdb_byte *myaddr,
 142                     ssize_t len)
 143 {
 144   int ret = target_read_memory (memaddr, myaddr, len);
 145
 146   if (ret != 0)
 147     DEBUG ("error reading memory at addr %s len = %ld.\n",
 148            paddress (gdbarch, memaddr), (long) len);
 149
 150   return ret;
 151 }
 152
 153 /* Stop recording.  */
 154
 155 static void
 156 record_stop (struct target_ops *t)
 157 {
 158   DEBUG ("stop %s", t->shortname ());
 159
 160   t->stop_recording ();
 161 }
 162
 163 /* Unpush the record target.  */
 164
 165 static void
 166 record_unpush (struct target_ops *t)
 167 {
 168   DEBUG ("unpush %s", t->shortname ());
 169
 170   current_inferior ()->unpush_target (t);
 171 }
 172
 173 /* See record.h.  */
 174
 175 void
 176 record_disconnect (struct target_ops *t, const char *args, int from_tty)
 177 {
 178   gdb_assert (t->stratum () == record_stratum);
 179
 180   DEBUG ("disconnect %s", t->shortname ());
 181
 182   record_stop (t);
 183   record_unpush (t);
 184
 185   target_disconnect (args, from_tty);
 186 }
 187
 188 /* See record.h.  */
 189
 190 void
 191 record_detach (struct target_ops *t, inferior *inf, int from_tty)
 192 {
 193   gdb_assert (t->stratum () == record_stratum);
 194
 195   DEBUG ("detach %s", t->shortname ());
 196
 197   record_stop (t);
 198   record_unpush (t);
 199
 200   target_detach (inf, from_tty);
 201 }
 202
 203 /* See record.h.  */
 204
 205 void
 206 record_mourn_inferior (struct target_ops *t)
 207 {
 208   gdb_assert (t->stratum () == record_stratum);
 209
 210   DEBUG ("mourn inferior %s", t->shortname ());
 211
 212   /* It is safer to not stop recording.  Resources will be freed when
 213      threads are discarded.  */
 214   record_unpush (t);
 215
 216   target_mourn_inferior (inferior_ptid);
 217 }
 218
 219 /* See record.h.  */
 220
 221 void
 222 record_kill (struct target_ops *t)
 223 {
 224   gdb_assert (t->stratum () == record_stratum);
 225
 226   DEBUG ("kill %s", t->shortname ());
 227
 228   /* It is safer to not stop recording.  Resources will be freed when
 229      threads are discarded.  */
 230   record_unpush (t);
 231
 232   target_kill ();
 233 }
 234
 235 /* See record.h.  */
 236
 237 int
 238 record_check_stopped_by_breakpoint (const address_space *aspace,
 239                                     CORE_ADDR pc,
 240                                     enum target_stop_reason *reason)
 241 {
 242   if (breakpoint_inserted_here_p (aspace, pc))
 243     {
 244       if (hardware_breakpoint_inserted_here_p (aspace, pc))
 245         *reason = TARGET_STOPPED_BY_HW_BREAKPOINT;
 246       else
 247         *reason = TARGET_STOPPED_BY_SW_BREAKPOINT;
 248       return 1;
 249     }
 250
 251   return 0;
 252 }
 253
 254 /* Implement "show record debug" command.  */
 255
 256 static void
 257 show_record_debug (struct ui_file *file, int from_tty,
 258                    struct cmd_list_element *c, const char *value)
 259 {
 260   gdb_printf (file, _("Debugging of process record target is %s.\n"),
 261               value);
 262 }
 263
 264 /* Alias for "target record".  */
 265
 266 static void
 267 cmd_record_start (const char *args, int from_tty)
 268 {
 269   execute_command ("target record-full", from_tty);
 270 }
 271
 272 /* Truncate the record log from the present point
 273    of replay until the end.  */
 274
 275 static void
 276 cmd_record_delete (const char *args, int from_tty)
 277 {
 278   require_record_target ();
 279
 280   if (!target_record_is_replaying (inferior_ptid))
 281     {
 282       gdb_printf (_("Already at end of record list.\n"));
 283       return;
 284     }
 285
 286   if (!target_supports_delete_record ())
 287     {
 288       gdb_printf (_("The current record target does not support "
 289                     "this operation.\n"));
 290       return;
 291     }
 292
 293   if (!from_tty || query (_("Delete the log from this point forward "
 294                             "and begin to record the running message "
 295                             "at current PC?")))
 296     target_delete_record ();
 297 }
 298
 299 /* Implement the "stoprecord" or "record stop" command.  */
 300
 301 static void
 302 cmd_record_stop (const char *args, int from_tty)
 303 {
 304   struct target_ops *t;
 305
 306   t = require_record_target ();
 307
 308   record_stop (t);
 309   record_unpush (t);
 310
 311   gdb_printf (_("Process record is stopped and all execution "
 312                 "logs are deleted.\n"));
 313
 314   interps_notify_record_changed (current_inferior (), 0, NULL, NULL);
 315 }
 316
 317
 318 /* The "info record" command.  */
 319
 320 static void
 321 info_record_command (const char *args, int from_tty)
 322 {
 323   struct target_ops *t;
 324
 325   t = find_record_target ();
 326   if (t == NULL)
 327     {
 328       gdb_printf (_("No recording is currently active.\n"));
 329       return;
 330     }
 331
 332   gdb_printf (_("Active record target: %s\n"), t->shortname ());
 333   t->info_record ();
 334 }
 335
 336 /* The "record save" command.  */
 337
 338 static void
 339 cmd_record_save (const char *args, int from_tty)
 340 {
 341   const char *recfilename;
 342   char recfilename_buffer[40];
 343
 344   require_record_target ();
 345
 346   if (args != NULL && *args != 0)
 347     recfilename = args;
 348   else
 349     {
 350       /* Default recfile name is "gdb_record.PID".  */
 351       xsnprintf (recfilename_buffer, sizeof (recfilename_buffer),
 352                 "gdb_record.%d", inferior_ptid.pid ());
 353       recfilename = recfilename_buffer;
 354     }
 355
 356   target_save_record (recfilename);
 357 }
 358
 359 /* See record.h.  */
 360
 361 void
 362 record_goto (const char *arg)
 363 {
 364   ULONGEST insn;
 365
 366   if (arg == NULL || *arg == '\0')
 367     error (_("Command requires an argument (insn number to go to)."));
 368
 369   insn = parse_and_eval_long (arg);
 370
 371   require_record_target ();
 372   target_goto_record (insn);
 373 }
 374
 375 /* "record goto" command.  Argument is an instruction number,
 376    as given by "info record".
 377
 378    Rewinds the recording (forward or backward) to the given instruction.  */
 379
 380 static void
 381 cmd_record_goto (const char *arg, int from_tty)
 382 {
 383   record_goto (arg);
 384 }
 385
 386 /* The "record goto begin" command.  */
 387
 388 static void
 389 cmd_record_goto_begin (const char *arg, int from_tty)
 390 {
 391   if (arg != NULL && *arg != '\0')
 392     error (_("Junk after argument: %s."), arg);
 393
 394   require_record_target ();
 395   target_goto_record_begin ();
 396 }
 397
 398 /* The "record goto end" command.  */
 399
 400 static void
 401 cmd_record_goto_end (const char *arg, int from_tty)
 402 {
 403   if (arg != NULL && *arg != '\0')
 404     error (_("Junk after argument: %s."), arg);
 405
 406   require_record_target ();
 407   target_goto_record_end ();
 408 }
 409
 410 /* Read an instruction number from an argument string.  */
 411
 412 static ULONGEST
 413 get_insn_number (const char **arg)
 414 {
 415   ULONGEST number;
 416   const char *begin, *end, *pos;
 417
 418   begin = *arg;
 419   pos = skip_spaces (begin);
 420
 421   if (!isdigit (*pos))
 422     error (_("Expected positive number, got: %s."), pos);
 423
 424   number = strtoulst (pos, &end, 10);
 425
 426   *arg += (end - begin);
 427
 428   return number;
 429 }
 430
 431 /* Read a context size from an argument string.  */
 432
 433 static int
 434 get_context_size (const char **arg)
 435 {
 436   const char *pos;
 437   char *end;
 438
 439   pos = skip_spaces (*arg);
 440
 441   if (!isdigit (*pos))
 442     error (_("Expected positive number, got: %s."), pos);
 443
 444   long result = strtol (pos, &end, 10);
 445   *arg = end;
 446   return result;
 447 }
 448
 449 /* Complain about junk at the end of an argument string.  */
 450
 451 static void
 452 no_chunk (const char *arg)
 453 {
 454   if (*arg != 0)
 455     error (_("Junk after argument: %s."), arg);
 456 }
 457
 458 /* Read instruction-history modifiers from an argument string.  */
 459
 460 static gdb_disassembly_flags
 461 get_insn_history_modifiers (const char **arg)
 462 {
 463   gdb_disassembly_flags modifiers;
 464   const char *args;
 465
 466   modifiers = 0;
 467   args = *arg;
 468
 469   if (args == NULL)
 470     return modifiers;
 471
 472   while (*args == '/')
 473     {
 474       ++args;
 475
 476       if (*args == '\0')
 477         error (_("Missing modifier."));
 478
 479       for (; *args; ++args)
 480         {
 481           if (isspace (*args))
 482             break;
 483
 484           if (*args == '/')
 485             continue;
 486
 487           switch (*args)
 488             {
 489             case 'm':
 490             case 's':
 491               modifiers |= DISASSEMBLY_SOURCE;
 492               modifiers |= DISASSEMBLY_FILENAME;
 493               break;
 494             case 'r':
 495               modifiers |= DISASSEMBLY_RAW_INSN;
 496               break;
 497             case 'b':
 498               modifiers |= DISASSEMBLY_RAW_BYTES;
 499               break;
 500             case 'f':
 501               modifiers |= DISASSEMBLY_OMIT_FNAME;
 502               break;
 503             case 'p':
 504               modifiers |= DISASSEMBLY_OMIT_PC;
 505               break;
 506             default:
 507               error (_("Invalid modifier: %c."), *args);
 508             }
 509         }
 510
 511       args = skip_spaces (args);
 512     }
 513
 514   /* Update the argument string.  */
 515   *arg = args;
 516
 517   return modifiers;
 518 }
 519
 520 /* The "set record instruction-history-size / set record
 521    function-call-history-size" commands are unsigned, with UINT_MAX
 522    meaning unlimited.  The target interfaces works with signed int
 523    though, to indicate direction, so map "unlimited" to INT_MAX, which
 524    is about the same as unlimited in practice.  If the user does have
 525    a log that huge, she can fetch it in chunks across several requests,
 526    but she'll likely have other problems first...  */
 527
 528 static int
 529 command_size_to_target_size (unsigned int size)
 530 {
 531   gdb_assert (size <= INT_MAX || size == UINT_MAX);
 532
 533   if (size == UINT_MAX)
 534     return INT_MAX;
 535   else
 536     return size;
 537 }
 538
 539 /* The "record instruction-history" command.  */
 540
 541 static void
 542 cmd_record_insn_history (const char *arg, int from_tty)
 543 {
 544   require_record_target ();
 545
 546   gdb_disassembly_flags flags = get_insn_history_modifiers (&arg);
 547
 548   int size = command_size_to_target_size (record_insn_history_size);
 549
 550   if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0)
 551     target_insn_history (size, flags);
 552   else if (strcmp (arg, "-") == 0)
 553     target_insn_history (-size, flags);
 554   else
 555     {
 556       ULONGEST begin, end;
 557
 558       begin = get_insn_number (&arg);
 559
 560       if (*arg == ',')
 561         {
 562           arg = skip_spaces (++arg);
 563
 564           if (*arg == '+')
 565             {
 566               arg += 1;
 567               size = get_context_size (&arg);
 568
 569               no_chunk (arg);
 570
 571               target_insn_history_from (begin, size, flags);
 572             }
 573           else if (*arg == '-')
 574             {
 575               arg += 1;
 576               size = get_context_size (&arg);
 577
 578               no_chunk (arg);
 579
 580               target_insn_history_from (begin, -size, flags);
 581             }
 582           else
 583             {
 584               end = get_insn_number (&arg);
 585
 586               no_chunk (arg);
 587
 588               target_insn_history_range (begin, end, flags);
 589             }
 590         }
 591       else
 592         {
 593           no_chunk (arg);
 594
 595           target_insn_history_from (begin, size, flags);
 596         }
 597
 598       dont_repeat ();
 599     }
 600 }
 601
 602 /* Read function-call-history modifiers from an argument string.  */
 603
 604 static record_print_flags
 605 get_call_history_modifiers (const char **arg)
 606 {
 607   record_print_flags modifiers = 0;
 608   const char *args = *arg;
 609
 610   if (args == NULL)
 611     return modifiers;
 612
 613   while (*args == '/')
 614     {
 615       ++args;
 616
 617       if (*args == '\0')
 618         error (_("Missing modifier."));
 619
 620       for (; *args; ++args)
 621         {
 622           if (isspace (*args))
 623             break;
 624
 625           if (*args == '/')
 626             continue;
 627
 628           switch (*args)
 629             {
 630             case 'l':
 631               modifiers |= RECORD_PRINT_SRC_LINE;
 632               break;
 633             case 'i':
 634               modifiers |= RECORD_PRINT_INSN_RANGE;
 635               break;
 636             case 'c':
 637               modifiers |= RECORD_PRINT_INDENT_CALLS;
 638               break;
 639             default:
 640               error (_("Invalid modifier: %c."), *args);
 641             }
 642         }
 643
 644       args = skip_spaces (args);
 645     }
 646
 647   /* Update the argument string.  */
 648   *arg = args;
 649
 650   return modifiers;
 651 }
 652
 653 /* The "record function-call-history" command.  */
 654
 655 static void
 656 cmd_record_call_history (const char *arg, int from_tty)
 657 {
 658   require_record_target ();
 659
 660   record_print_flags flags = get_call_history_modifiers (&arg);
 661
 662   int size = command_size_to_target_size (record_call_history_size);
 663
 664   if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0)
 665     target_call_history (size, flags);
 666   else if (strcmp (arg, "-") == 0)
 667     target_call_history (-size, flags);
 668   else
 669     {
 670       ULONGEST begin, end;
 671
 672       begin = get_insn_number (&arg);
 673
 674       if (*arg == ',')
 675         {
 676           arg = skip_spaces (++arg);
 677
 678           if (*arg == '+')
 679             {
 680               arg += 1;
 681               size = get_context_size (&arg);
 682
 683               no_chunk (arg);
 684
 685               target_call_history_from (begin, size, flags);
 686             }
 687           else if (*arg == '-')
 688             {
 689               arg += 1;
 690               size = get_context_size (&arg);
 691
 692               no_chunk (arg);
 693
 694               target_call_history_from (begin, -size, flags);
 695             }
 696           else
 697             {
 698               end = get_insn_number (&arg);
 699
 700               no_chunk (arg);
 701
 702               target_call_history_range (begin, end, flags);
 703             }
 704         }
 705       else
 706         {
 707           no_chunk (arg);
 708
 709           target_call_history_from (begin, size, flags);
 710         }
 711
 712       dont_repeat ();
 713     }
 714 }
 715
 716 /* Helper for "set record instruction-history-size" and "set record
 717    function-call-history-size" input validation.  COMMAND_VAR is the
 718    variable registered in the command as control variable.  *SETTING
 719    is the real setting the command allows changing.  */
 720
 721 static void
 722 validate_history_size (unsigned int *command_var, unsigned int *setting)
 723 {
 724   if (*command_var != UINT_MAX && *command_var > INT_MAX)
 725     {
 726       unsigned int new_value = *command_var;
 727
 728       /* Restore previous value.  */
 729       *command_var = *setting;
 730       error (_("integer %u out of range"), new_value);
 731     }
 732
 733   /* Commit new value.  */
 734   *setting = *command_var;
 735 }
 736
 737 /* Called by do_setshow_command.  We only want values in the
 738    [0..INT_MAX] range, while the command's machinery accepts
 739    [0..UINT_MAX].  See command_size_to_target_size.  */
 740
 741 static void
 742 set_record_insn_history_size (const char *args, int from_tty,
 743                               struct cmd_list_element *c)
 744 {
 745   validate_history_size (&record_insn_history_size_setshow_var,
 746                          &record_insn_history_size);
 747 }
 748
 749 /* Called by do_setshow_command.  We only want values in the
 750    [0..INT_MAX] range, while the command's machinery accepts
 751    [0..UINT_MAX].  See command_size_to_target_size.  */
 752
 753 static void
 754 set_record_call_history_size (const char *args, int from_tty,
 755                               struct cmd_list_element *c)
 756 {
 757   validate_history_size (&record_call_history_size_setshow_var,
 758                          &record_call_history_size);
 759 }
 760
 761 void _initialize_record ();
 762 void
 763 _initialize_record ()
 764 {
 765   struct cmd_list_element *c;
 766
 767   add_setshow_zuinteger_cmd ("record", no_class, &record_debug,
 768                              _("Set debugging of record/replay feature."),
 769                              _("Show debugging of record/replay feature."),
 770                              _("When enabled, debugging output for "
 771                                "record/replay feature is displayed."),
 772                              NULL, show_record_debug, &setdebuglist,
 773                              &showdebuglist);
 774
 775   add_setshow_uinteger_cmd ("instruction-history-size", no_class,
 776                             &record_insn_history_size_setshow_var, _("\
 777 Set number of instructions to print in \"record instruction-history\"."), _("\
 778 Show number of instructions to print in \"record instruction-history\"."), _("\
 779 A size of \"unlimited\" means unlimited instructions.  The default is 10."),
 780                             set_record_insn_history_size, NULL,
 781                             &set_record_cmdlist, &show_record_cmdlist);
 782
 783   add_setshow_uinteger_cmd ("function-call-history-size", no_class,
 784                             &record_call_history_size_setshow_var, _("\
 785 Set number of function to print in \"record function-call-history\"."), _("\
 786 Show number of functions to print in \"record function-call-history\"."), _("\
 787 A size of \"unlimited\" means unlimited lines.  The default is 10."),
 788                             set_record_call_history_size, NULL,
 789                             &set_record_cmdlist, &show_record_cmdlist);
 790
 791   cmd_list_element *record_cmd
 792     = add_prefix_cmd ("record", class_obscure, cmd_record_start,
 793                       _("Start recording."),
 794                       &record_cmdlist, 0, &cmdlist);
 795   set_cmd_completer (record_cmd, filename_completer);
 796
 797   add_com_alias ("rec", record_cmd, class_obscure, 1);
 798
 799   set_show_commands setshow_record_cmds
 800     = add_setshow_prefix_cmd ("record", class_support,
 801                               _("Set record options."),
 802                               _("Show record options."),
 803                               &set_record_cmdlist, &show_record_cmdlist,
 804                               &setlist, &showlist);
 805
 806
 807   add_alias_cmd ("rec", setshow_record_cmds.set, class_obscure, 1, &setlist);
 808   add_alias_cmd ("rec", setshow_record_cmds.show, class_obscure, 1, &showlist);
 809
 810   cmd_list_element *info_record_cmd
 811     = add_prefix_cmd ("record", class_support, info_record_command,
 812                       _("Info record options."), &info_record_cmdlist,
 813                       0, &infolist);
 814   add_alias_cmd ("rec", info_record_cmd, class_obscure, 1, &infolist);
 815
 816   c = add_cmd ("save", class_obscure, cmd_record_save,
 817                _("Save the execution log to a file.\n\
 818 Usage: record save [FILENAME]\n\
 819 Default filename is 'gdb_record.PROCESS_ID'."),
 820                &record_cmdlist);
 821   set_cmd_completer (c, filename_completer);
 822
 823   cmd_list_element *record_delete_cmd
 824     =  add_cmd ("delete", class_obscure, cmd_record_delete,
 825                 _("Delete the rest of execution log and start recording it \
 826 anew."),
 827             &record_cmdlist);
 828   add_alias_cmd ("d", record_delete_cmd, class_obscure, 1, &record_cmdlist);
 829   add_alias_cmd ("del", record_delete_cmd, class_obscure, 1, &record_cmdlist);
 830
 831   cmd_list_element *record_stop_cmd
 832     = add_cmd ("stop", class_obscure, cmd_record_stop,
 833                _("Stop the record/replay target."),
 834                &record_cmdlist);
 835   add_alias_cmd ("s", record_stop_cmd, class_obscure, 1, &record_cmdlist);
 836
 837   add_prefix_cmd ("goto", class_obscure, cmd_record_goto, _("\
 838 Restore the program to its state at instruction number N.\n\
 839 Argument is instruction number, as shown by 'info record'."),
 840                   &record_goto_cmdlist, 1, &record_cmdlist);
 841
 842   cmd_list_element *record_goto_begin_cmd
 843     = add_cmd ("begin", class_obscure, cmd_record_goto_begin,
 844                _("Go to the beginning of the execution log."),
 845                &record_goto_cmdlist);
 846   add_alias_cmd ("start", record_goto_begin_cmd, class_obscure, 1,
 847                  &record_goto_cmdlist);
 848
 849   add_cmd ("end", class_obscure, cmd_record_goto_end,
 850            _("Go to the end of the execution log."),
 851            &record_goto_cmdlist);
 852
 853   add_cmd ("instruction-history", class_obscure, cmd_record_insn_history, _("\
 854 Print disassembled instructions stored in the execution log.\n\
 855 With a /m or /s modifier, source lines are included (if available).\n\
 856 With a /r modifier, raw instructions in hex are included.\n\
 857 With a /f modifier, function names are omitted.\n\
 858 With a /p modifier, current position markers are omitted.\n\
 859 With no argument, disassembles ten more instructions after the previous \
 860 disassembly.\n\
 861 \"record instruction-history -\" disassembles ten instructions before a \
 862 previous disassembly.\n\
 863 One argument specifies an instruction number as shown by 'info record', and \
 864 ten instructions are disassembled after that instruction.\n\
 865 Two arguments with comma between them specify starting and ending instruction \
 866 numbers to disassemble.\n\
 867 If the second argument is preceded by '+' or '-', it specifies the distance \
 868 from the first argument.\n\
 869 The number of instructions to disassemble can be defined with \"set record \
 870 instruction-history-size\"."),
 871            &record_cmdlist);
 872
 873   add_cmd ("function-call-history", class_obscure, cmd_record_call_history, _("\
 874 Prints the execution history at function granularity.\n\
 875 It prints one line for each sequence of instructions that belong to the same \
 876 function.\n\
 877 Without modifiers, it prints the function name.\n\
 878 With a /l modifier, the source file and line number range is included.\n\
 879 With a /i modifier, the instruction number range is included.\n\
 880 With a /c modifier, the output is indented based on the call stack depth.\n\
 881 With no argument, prints ten more lines after the previous ten-line print.\n\
 882 \"record function-call-history -\" prints ten lines before a previous ten-line \
 883 print.\n\
 884 One argument specifies a function number as shown by 'info record', and \
 885 ten lines are printed after that function.\n\
 886 Two arguments with comma between them specify a range of functions to print.\n\
 887 If the second argument is preceded by '+' or '-', it specifies the distance \
 888 from the first argument.\n\
 889 The number of functions to print can be defined with \"set record \
 890 function-call-history-size\"."),
 891            &record_cmdlist);
 892
 893   /* Sync command control variables.  */
 894   record_insn_history_size_setshow_var = record_insn_history_size;
 895   record_call_history_size_setshow_var = record_call_history_size;
 896 }