sys/ddb/db_command.c

   1 /*-
   2  * Mach Operating System
   3  * Copyright (c) 1991,1990 Carnegie Mellon University
   4  * All Rights Reserved.
   5  *
   6  * Permission to use, copy, modify and distribute this software and its
   7  * documentation is hereby granted, provided that both the copyright
   8  * notice and this permission notice appear in all copies of the
   9  * software, derivative works or modified versions, and any portions
  10  * thereof, and that both notices appear in supporting documentation.
  11  *
  12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
  13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  15  *
  16  * Carnegie Mellon requests users of this software to return to
  17  *
  18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  19  *  School of Computer Science
  20  *  Carnegie Mellon University
  21  *  Pittsburgh PA 15213-3890
  22  *
  23  * any improvements or extensions that they make and grant Carnegie the
  24  * rights to redistribute these changes.
  25  */
  26 /*
  27  *      Author: David B. Golub, Carnegie Mellon University
  28  *      Date:   7/90
  29  */
  30 /*
  31  * Command dispatcher.
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <sys/param.h>
  38 #include <sys/linker_set.h>
  39 #include <sys/lock.h>
  40 #include <sys/kdb.h>
  41 #include <sys/mutex.h>
  42 #include <sys/proc.h>
  43 #include <sys/reboot.h>
  44 #include <sys/signalvar.h>
  45 #include <sys/systm.h>
  46 #include <sys/cons.h>
  47 #include <sys/watchdog.h>
  48
  49 #include <ddb/ddb.h>
  50 #include <ddb/db_command.h>
  51 #include <ddb/db_lex.h>
  52 #include <ddb/db_output.h>
  53
  54 #include <machine/cpu.h>
  55 #include <machine/setjmp.h>
  56
  57 /*
  58  * Exported global variables
  59  */
  60 boolean_t       db_cmd_loop_done;
  61 db_addr_t       db_dot;
  62 db_addr_t       db_last_addr;
  63 db_addr_t       db_prev;
  64 db_addr_t       db_next;
  65
  66 SET_DECLARE(db_cmd_set, struct command);
  67 SET_DECLARE(db_show_cmd_set, struct command);
  68 SET_DECLARE(db_show_all_cmd_set, struct command);
  69
  70 static db_cmdfcn_t      db_fncall;
  71 static db_cmdfcn_t      db_gdb;
  72 static db_cmdfcn_t      db_halt;
  73 static db_cmdfcn_t      db_kill;
  74 static db_cmdfcn_t      db_reset;
  75 static db_cmdfcn_t      db_stack_trace;
  76 static db_cmdfcn_t      db_stack_trace_all;
  77 static db_cmdfcn_t      db_watchdog;
  78
  79 /*
  80  * 'show' commands
  81  */
  82
  83 static struct command db_show_all_cmds[] = {
  84         { (char *)0 }
  85 };
  86
  87 static struct command_table db_show_all_table = {
  88         db_show_all_cmds,
  89         SET_BEGIN(db_show_all_cmd_set),
  90         SET_LIMIT(db_show_all_cmd_set)
  91 };
  92
  93 static struct command db_show_cmds[] = {
  94         { "all",        0,                      0,      &db_show_all_table },
  95         { "registers",  db_show_regs,           0,      0 },
  96         { "breaks",     db_listbreak_cmd,       0,      0 },
  97         { "threads",    db_show_threads,        0,      0 },
  98         { (char *)0, }
  99 };
 100
 101 static struct command_table db_show_table = {
 102         db_show_cmds,
 103         SET_BEGIN(db_show_cmd_set),
 104         SET_LIMIT(db_show_cmd_set)
 105 };
 106
 107 static struct command db_commands[] = {
 108         { "print",      db_print_cmd,           0,      0 },
 109         { "p",          db_print_cmd,           0,      0 },
 110         { "examine",    db_examine_cmd,         CS_SET_DOT, 0 },
 111         { "x",          db_examine_cmd,         CS_SET_DOT, 0 },
 112         { "search",     db_search_cmd,          CS_OWN|CS_SET_DOT, 0 },
 113         { "set",        db_set_cmd,             CS_OWN, 0 },
 114         { "write",      db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
 115         { "w",          db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
 116         { "delete",     db_delete_cmd,          0,      0 },
 117         { "d",          db_delete_cmd,          0,      0 },
 118         { "break",      db_breakpoint_cmd,      0,      0 },
 119         { "b",          db_breakpoint_cmd,      0,      0 },
 120         { "dwatch",     db_deletewatch_cmd,     0,      0 },
 121         { "watch",      db_watchpoint_cmd,      CS_MORE,0 },
 122         { "dhwatch",    db_deletehwatch_cmd,    0,      0 },
 123         { "hwatch",     db_hwatchpoint_cmd,     0,      0 },
 124         { "step",       db_single_step_cmd,     0,      0 },
 125         { "s",          db_single_step_cmd,     0,      0 },
 126         { "continue",   db_continue_cmd,        0,      0 },
 127         { "c",          db_continue_cmd,        0,      0 },
 128         { "until",      db_trace_until_call_cmd,0,      0 },
 129         { "next",       db_trace_until_matching_cmd,0,  0 },
 130         { "match",      db_trace_until_matching_cmd,0,  0 },
 131         { "trace",      db_stack_trace,         CS_OWN, 0 },
 132         { "t",          db_stack_trace,         CS_OWN, 0 },
 133         { "alltrace",   db_stack_trace_all,     0,      0 },
 134         { "where",      db_stack_trace,         CS_OWN, 0 },
 135         { "bt",         db_stack_trace,         CS_OWN, 0 },
 136         { "call",       db_fncall,              CS_OWN, 0 },
 137         { "show",       0,                      0,      &db_show_table },
 138         { "ps",         db_ps,                  0,      0 },
 139         { "gdb",        db_gdb,                 0,      0 },
 140         { "halt",       db_halt,                0,      0 },
 141         { "reboot",     db_reset,               0,      0 },
 142         { "reset",      db_reset,               0,      0 },
 143         { "kill",       db_kill,                CS_OWN, 0 },
 144         { "watchdog",   db_watchdog,            0,      0 },
 145         { "thread",     db_set_thread,          CS_OWN, 0 },
 146         { "run",        db_run_cmd,             CS_OWN, 0 },
 147         { "script",     db_script_cmd,          CS_OWN, 0 },
 148         { "scripts",    db_scripts_cmd,         0,      0 },
 149         { "unscript",   db_unscript_cmd,        CS_OWN, 0 },
 150         { "capture",    db_capture_cmd,         CS_OWN, 0 },
 151         { "textdump",   db_textdump_cmd,        CS_OWN, 0 },
 152         { (char *)0, }
 153 };
 154
 155 static struct command_table db_command_table = {
 156         db_commands,
 157         SET_BEGIN(db_cmd_set),
 158         SET_LIMIT(db_cmd_set)
 159 };
 160
 161 static struct command   *db_last_command = 0;
 162
 163 /*
 164  * if 'ed' style: 'dot' is set at start of last item printed,
 165  * and '+' points to next line.
 166  * Otherwise: 'dot' points to next item, '..' points to last.
 167  */
 168 static boolean_t        db_ed_style = TRUE;
 169
 170 /*
 171  * Utility routine - discard tokens through end-of-line.
 172  */
 173 void
 174 db_skip_to_eol()
 175 {
 176         int     t;
 177         do {
 178             t = db_read_token();
 179         } while (t != tEOL);
 180 }
 181
 182 /*
 183  * Results of command search.
 184  */
 185 #define CMD_UNIQUE      0
 186 #define CMD_FOUND       1
 187 #define CMD_NONE        2
 188 #define CMD_AMBIGUOUS   3
 189 #define CMD_HELP        4
 190
 191 static void     db_cmd_match(char *name, struct command *cmd,
 192                     struct command **cmdp, int *resultp);
 193 static void     db_cmd_list(struct command_table *table);
 194 static int      db_cmd_search(char *name, struct command_table *table,
 195                     struct command **cmdp);
 196 static void     db_command(struct command **last_cmdp,
 197                     struct command_table *cmd_table, int dopager);
 198
 199 /*
 200  * Helper function to match a single command.
 201  */
 202 static void
 203 db_cmd_match(name, cmd, cmdp, resultp)
 204         char *          name;
 205         struct command  *cmd;
 206         struct command  **cmdp; /* out */
 207         int *           resultp;
 208 {
 209         char *lp, *rp;
 210         int c;
 211
 212         lp = name;
 213         rp = cmd->name;
 214         while ((c = *lp) == *rp) {
 215                 if (c == 0) {
 216                         /* complete match */
 217                         *cmdp = cmd;
 218                         *resultp = CMD_UNIQUE;
 219                         return;
 220                 }
 221                 lp++;
 222                 rp++;
 223         }
 224         if (c == 0) {
 225                 /* end of name, not end of command -
 226                    partial match */
 227                 if (*resultp == CMD_FOUND) {
 228                         *resultp = CMD_AMBIGUOUS;
 229                         /* but keep looking for a full match -
 230                            this lets us match single letters */
 231                 } else {
 232                         *cmdp = cmd;
 233                         *resultp = CMD_FOUND;
 234                 }
 235         }
 236 }
 237
 238 /*
 239  * Search for command prefix.
 240  */
 241 static int
 242 db_cmd_search(name, table, cmdp)
 243         char *          name;
 244         struct command_table *table;
 245         struct command  **cmdp; /* out */
 246 {
 247         struct command  *cmd;
 248         struct command  **aux_cmdp;
 249         int             result = CMD_NONE;
 250
 251         for (cmd = table->table; cmd->name != 0; cmd++) {
 252                 db_cmd_match(name, cmd, cmdp, &result);
 253                 if (result == CMD_UNIQUE)
 254                         return (CMD_UNIQUE);
 255         }
 256         if (table->aux_tablep != NULL)
 257                 for (aux_cmdp = table->aux_tablep;
 258                      aux_cmdp < table->aux_tablep_end;
 259                      aux_cmdp++) {
 260                         db_cmd_match(name, *aux_cmdp, cmdp, &result);
 261                         if (result == CMD_UNIQUE)
 262                                 return (CMD_UNIQUE);
 263                 }
 264         if (result == CMD_NONE) {
 265                 /* check for 'help' */
 266                 if (name[0] == 'h' && name[1] == 'e'
 267                     && name[2] == 'l' && name[3] == 'p')
 268                         result = CMD_HELP;
 269         }
 270         return (result);
 271 }
 272
 273 static void
 274 db_cmd_list(table)
 275         struct command_table *table;
 276 {
 277         register struct command *cmd;
 278         register struct command **aux_cmdp;
 279
 280         for (cmd = table->table; cmd->name != 0; cmd++) {
 281             db_printf("%-12s", cmd->name);
 282             db_end_line(12);
 283         }
 284         if (table->aux_tablep == NULL)
 285             return;
 286         for (aux_cmdp = table->aux_tablep; aux_cmdp < table->aux_tablep_end;
 287              aux_cmdp++) {
 288             db_printf("%-12s", (*aux_cmdp)->name);
 289             db_end_line(12);
 290         }
 291 }
 292
 293 static void
 294 db_command(last_cmdp, cmd_table, dopager)
 295         struct command  **last_cmdp;    /* IN_OUT */
 296         struct command_table *cmd_table;
 297         int dopager;
 298 {
 299         struct command  *cmd;
 300         int             t;
 301         char            modif[TOK_STRING_SIZE];
 302         db_expr_t       addr, count;
 303         boolean_t       have_addr = FALSE;
 304         int             result;
 305
 306         t = db_read_token();
 307         if (t == tEOL) {
 308             /* empty line repeats last command, at 'next' */
 309             cmd = *last_cmdp;
 310             addr = (db_expr_t)db_next;
 311             have_addr = FALSE;
 312             count = 1;
 313             modif[0] = '\0';
 314         }
 315         else if (t == tEXCL) {
 316             db_fncall((db_expr_t)0, (boolean_t)0, (db_expr_t)0, (char *)0);
 317             return;
 318         }
 319         else if (t != tIDENT) {
 320             db_printf("?\n");
 321             db_flush_lex();
 322             return;
 323         }
 324         else {
 325             /*
 326              * Search for command
 327              */
 328             while (cmd_table) {
 329                 result = db_cmd_search(db_tok_string,
 330                                        cmd_table,
 331                                        &cmd);
 332                 switch (result) {
 333                     case CMD_NONE:
 334                         db_printf("No such command\n");
 335                         db_flush_lex();
 336                         return;
 337                     case CMD_AMBIGUOUS:
 338                         db_printf("Ambiguous\n");
 339                         db_flush_lex();
 340                         return;
 341                     case CMD_HELP:
 342                         db_cmd_list(cmd_table);
 343                         db_flush_lex();
 344                         return;
 345                     default:
 346                         break;
 347                 }
 348                 if ((cmd_table = cmd->more) != NULL) {
 349                     t = db_read_token();
 350                     if (t != tIDENT) {
 351                         db_cmd_list(cmd_table);
 352                         db_flush_lex();
 353                         return;
 354                     }
 355                 }
 356             }
 357
 358             if ((cmd->flag & CS_OWN) == 0) {
 359                 /*
 360                  * Standard syntax:
 361                  * command [/modifier] [addr] [,count]
 362                  */
 363                 t = db_read_token();
 364                 if (t == tSLASH) {
 365                     t = db_read_token();
 366                     if (t != tIDENT) {
 367                         db_printf("Bad modifier\n");
 368                         db_flush_lex();
 369                         return;
 370                     }
 371                     db_strcpy(modif, db_tok_string);
 372                 }
 373                 else {
 374                     db_unread_token(t);
 375                     modif[0] = '\0';
 376                 }
 377
 378                 if (db_expression(&addr)) {
 379                     db_dot = (db_addr_t) addr;
 380                     db_last_addr = db_dot;
 381                     have_addr = TRUE;
 382                 }
 383                 else {
 384                     addr = (db_expr_t) db_dot;
 385                     have_addr = FALSE;
 386                 }
 387                 t = db_read_token();
 388                 if (t == tCOMMA) {
 389                     if (!db_expression(&count)) {
 390                         db_printf("Count missing\n");
 391                         db_flush_lex();
 392                         return;
 393                     }
 394                 }
 395                 else {
 396                     db_unread_token(t);
 397                     count = -1;
 398                 }
 399                 if ((cmd->flag & CS_MORE) == 0) {
 400                     db_skip_to_eol();
 401                 }
 402             }
 403         }
 404         *last_cmdp = cmd;
 405         if (cmd != 0) {
 406             /*
 407              * Execute the command.
 408              */
 409             if (dopager)
 410                 db_enable_pager();
 411             else
 412                 db_disable_pager();
 413             (*cmd->fcn)(addr, have_addr, count, modif);
 414             if (dopager)
 415                 db_disable_pager();
 416
 417             if (cmd->flag & CS_SET_DOT) {
 418                 /*
 419                  * If command changes dot, set dot to
 420                  * previous address displayed (if 'ed' style).
 421                  */
 422                 if (db_ed_style) {
 423                     db_dot = db_prev;
 424                 }
 425                 else {
 426                     db_dot = db_next;
 427                 }
 428             }
 429             else {
 430                 /*
 431                  * If command does not change dot,
 432                  * set 'next' location to be the same.
 433                  */
 434                 db_next = db_dot;
 435             }
 436         }
 437 }
 438
 439 /*
 440  * At least one non-optional command must be implemented using
 441  * DB_COMMAND() so that db_cmd_set gets created.  Here is one.
 442  */
 443 DB_COMMAND(panic, db_panic)
 444 {
 445         db_disable_pager();
 446         panic("from debugger");
 447 }
 448
 449 void
 450 db_command_loop()
 451 {
 452         /*
 453          * Initialize 'prev' and 'next' to dot.
 454          */
 455         db_prev = db_dot;
 456         db_next = db_dot;
 457
 458         db_cmd_loop_done = 0;
 459         while (!db_cmd_loop_done) {
 460             if (db_print_position() != 0)
 461                 db_printf("\n");
 462
 463             db_printf("db> ");
 464             (void) db_read_line();
 465
 466             db_command(&db_last_command, &db_command_table, /* dopager */ 1);
 467         }
 468 }
 469
 470 /*
 471  * Execute a command on behalf of a script.  The caller is responsible for
 472  * making sure that the command string is < DB_MAXLINE or it will be
 473  * truncated.
 474  *
 475  * XXXRW: Runs by injecting faked input into DDB input stream; it would be
 476  * nicer to use an alternative approach that didn't mess with the previous
 477  * command buffer.
 478  */
 479 void
 480 db_command_script(const char *command)
 481 {
 482         db_prev = db_next = db_dot;
 483         db_inject_line(command);
 484         db_command(&db_last_command, &db_command_table, /* dopager */ 0);
 485 }
 486
 487 void
 488 db_error(s)
 489         const char *s;
 490 {
 491         if (s)
 492             db_printf("%s", s);
 493         db_flush_lex();
 494         kdb_reenter();
 495 }
 496
 497
 498 /*
 499  * Call random function:
 500  * !expr(arg,arg,arg)
 501  */
 502
 503 /* The generic implementation supports a maximum of 10 arguments. */
 504 typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t,
 505     db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t);
 506
 507 static __inline int
 508 db_fncall_generic(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[])
 509 {
 510         __db_f *f = (__db_f *)addr;
 511
 512         if (nargs > 10) {
 513                 db_printf("Too many arguments (max 10)\n");
 514                 return (0);
 515         }
 516         *rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5],
 517             args[6], args[7], args[8], args[9]);
 518         return (1);
 519 }
 520
 521 static void
 522 db_fncall(dummy1, dummy2, dummy3, dummy4)
 523         db_expr_t       dummy1;
 524         boolean_t       dummy2;
 525         db_expr_t       dummy3;
 526         char *          dummy4;
 527 {
 528         db_expr_t       fn_addr;
 529         db_expr_t       args[DB_MAXARGS];
 530         int             nargs = 0;
 531         db_expr_t       retval;
 532         int             t;
 533
 534         if (!db_expression(&fn_addr)) {
 535             db_printf("Bad function\n");
 536             db_flush_lex();
 537             return;
 538         }
 539
 540         t = db_read_token();
 541         if (t == tLPAREN) {
 542             if (db_expression(&args[0])) {
 543                 nargs++;
 544                 while ((t = db_read_token()) == tCOMMA) {
 545                     if (nargs == DB_MAXARGS) {
 546                         db_printf("Too many arguments (max %d)\n", DB_MAXARGS);
 547                         db_flush_lex();
 548                         return;
 549                     }
 550                     if (!db_expression(&args[nargs])) {
 551                         db_printf("Argument missing\n");
 552                         db_flush_lex();
 553                         return;
 554                     }
 555                     nargs++;
 556                 }
 557                 db_unread_token(t);
 558             }
 559             if (db_read_token() != tRPAREN) {
 560                 db_printf("?\n");
 561                 db_flush_lex();
 562                 return;
 563             }
 564         }
 565         db_skip_to_eol();
 566         db_disable_pager();
 567
 568         if (DB_CALL(fn_addr, &retval, nargs, args))
 569                 db_printf("= %#lr\n", (long)retval);
 570 }
 571
 572 static void
 573 db_halt(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
 574 {
 575
 576         cpu_halt();
 577 }
 578
 579 static void
 580 db_kill(dummy1, dummy2, dummy3, dummy4)
 581         db_expr_t       dummy1;
 582         boolean_t       dummy2;
 583         db_expr_t       dummy3;
 584         char *          dummy4;
 585 {
 586         db_expr_t old_radix, pid, sig;
 587         struct proc *p;
 588
 589 #define DB_ERROR(f)     do { db_printf f; db_flush_lex(); goto out; } while (0)
 590
 591         /*
 592          * PIDs and signal numbers are typically represented in base
 593          * 10, so make that the default here.  It can, of course, be
 594          * overridden by specifying a prefix.
 595          */
 596         old_radix = db_radix;
 597         db_radix = 10;
 598         /* Retrieve arguments. */
 599         if (!db_expression(&sig))
 600                 DB_ERROR(("Missing signal number\n"));
 601         if (!db_expression(&pid))
 602                 DB_ERROR(("Missing process ID\n"));
 603         db_skip_to_eol();
 604         if (sig < 1 || sig > _SIG_MAXSIG)
 605                 DB_ERROR(("Signal number out of range\n"));
 606
 607         /*
 608          * Find the process in question.  allproc_lock is not needed
 609          * since we're in DDB.
 610          */
 611         /* sx_slock(&allproc_lock); */
 612         FOREACH_PROC_IN_SYSTEM(p)
 613             if (p->p_pid == pid)
 614                     break;
 615         /* sx_sunlock(&allproc_lock); */
 616         if (p == NULL)
 617                 DB_ERROR(("Can't find process with pid %ld\n", (long) pid));
 618
 619         /* If it's already locked, bail; otherwise, do the deed. */
 620         if (PROC_TRYLOCK(p) == 0)
 621                 DB_ERROR(("Can't lock process with pid %ld\n", (long) pid));
 622         else {
 623                 psignal(p, sig);
 624                 PROC_UNLOCK(p);
 625         }
 626
 627 out:
 628         db_radix = old_radix;
 629 #undef DB_ERROR
 630 }
 631
 632 static void
 633 db_reset(dummy1, dummy2, dummy3, dummy4)
 634         db_expr_t       dummy1;
 635         boolean_t       dummy2;
 636         db_expr_t       dummy3;
 637         char *          dummy4;
 638 {
 639
 640         cpu_reset();
 641 }
 642
 643 static void
 644 db_watchdog(dummy1, dummy2, dummy3, dummy4)
 645         db_expr_t       dummy1;
 646         boolean_t       dummy2;
 647         db_expr_t       dummy3;
 648         char *          dummy4;
 649 {
 650         int i;
 651
 652         /*
 653          * XXX: It might make sense to be able to set the watchdog to a
 654          * XXX: timeout here so that failure or hang as a result of subsequent
 655          * XXX: ddb commands could be recovered by a reset.
 656          */
 657
 658         EVENTHANDLER_INVOKE(watchdog_list, 0, &i);
 659 }
 660
 661 static void
 662 db_gdb(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
 663 {
 664
 665         if (kdb_dbbe_select("gdb") != 0)
 666                 db_printf("The remote GDB backend could not be selected.\n");
 667         else
 668                 db_printf("Step to enter the remote GDB backend.\n");
 669 }
 670
 671 static void
 672 db_stack_trace(db_expr_t tid, boolean_t hastid, db_expr_t count, char *modif)
 673 {
 674         struct thread *td;
 675         db_expr_t radix;
 676         pid_t pid;
 677         int t;
 678
 679         /*
 680          * We parse our own arguments. We don't like the default radix.
 681          */
 682         radix = db_radix;
 683         db_radix = 10;
 684         hastid = db_expression(&tid);
 685         t = db_read_token();
 686         if (t == tCOMMA) {
 687                 if (!db_expression(&count)) {
 688                         db_printf("Count missing\n");
 689                         db_flush_lex();
 690                         return;
 691                 }
 692         } else {
 693                 db_unread_token(t);
 694                 count = -1;
 695         }
 696         db_skip_to_eol();
 697         db_radix = radix;
 698
 699         if (hastid) {
 700                 td = kdb_thr_lookup((lwpid_t)tid);
 701                 if (td == NULL)
 702                         td = kdb_thr_from_pid((pid_t)tid);
 703                 if (td == NULL) {
 704                         db_printf("Thread %d not found\n", (int)tid);
 705                         return;
 706                 }
 707         } else
 708                 td = kdb_thread;
 709         if (td->td_proc != NULL)
 710                 pid = td->td_proc->p_pid;
 711         else
 712                 pid = -1;
 713         db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td);
 714         db_trace_thread(td, count);
 715 }
 716
 717 static void
 718 db_stack_trace_all(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3,
 719     char *dummy4)
 720 {
 721         struct proc *p;
 722         struct thread *td;
 723         jmp_buf jb;
 724         void *prev_jb;
 725
 726         FOREACH_PROC_IN_SYSTEM(p) {
 727                 prev_jb = kdb_jmpbuf(jb);
 728                 if (setjmp(jb) == 0) {
 729                         FOREACH_THREAD_IN_PROC(p, td) {
 730                                 db_printf("\nTracing command %s pid %d tid %ld td %p\n",
 731                                           p->p_comm, p->p_pid, (long)td->td_tid, td);
 732                                 db_trace_thread(td, -1);
 733                                 if (db_pager_quit) {
 734                                         kdb_jmpbuf(prev_jb);
 735                                         return;
 736                                 }
 737                         }
 738                 }
 739                 kdb_jmpbuf(prev_jb);
 740         }
 741 }