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 #include <sys/kernel.h>
  49
  50 #include <ddb/ddb.h>
  51 #include <ddb/db_command.h>
  52 #include <ddb/db_lex.h>
  53 #include <ddb/db_output.h>
  54
  55 #include <machine/cpu.h>
  56 #include <machine/setjmp.h>
  57
  58 /*
  59  * Exported global variables
  60  */
  61 boolean_t       db_cmd_loop_done;
  62 db_addr_t       db_dot;
  63 db_addr_t       db_last_addr;
  64 db_addr_t       db_prev;
  65 db_addr_t       db_next;
  66
  67 static db_cmdfcn_t      db_fncall;
  68 static db_cmdfcn_t      db_gdb;
  69 static db_cmdfcn_t      db_halt;
  70 static db_cmdfcn_t      db_kill;
  71 static db_cmdfcn_t      db_reset;
  72 static db_cmdfcn_t      db_stack_trace;
  73 static db_cmdfcn_t      db_stack_trace_all;
  74 static db_cmdfcn_t      db_watchdog;
  75
  76 /*
  77  * 'show' commands
  78  */
  79
  80 static struct command db_show_all_cmds[] = {
  81         { "trace",      db_stack_trace_all,     0,      0 },
  82 };
  83 struct command_table db_show_all_table =
  84     LIST_HEAD_INITIALIZER(db_show_all_table);
  85
  86 static struct command db_show_cmds[] = {
  87         { "all",        0,                      0,      &db_show_all_table },
  88         { "registers",  db_show_regs,           0,      0 },
  89         { "breaks",     db_listbreak_cmd,       0,      0 },
  90         { "threads",    db_show_threads,        0,      0 },
  91 };
  92 struct command_table db_show_table = LIST_HEAD_INITIALIZER(db_show_table);
  93
  94 static struct command db_cmds[] = {
  95         { "print",      db_print_cmd,           0,      0 },
  96         { "p",          db_print_cmd,           0,      0 },
  97         { "examine",    db_examine_cmd,         CS_SET_DOT, 0 },
  98         { "x",          db_examine_cmd,         CS_SET_DOT, 0 },
  99         { "search",     db_search_cmd,          CS_OWN|CS_SET_DOT, 0 },
 100         { "set",        db_set_cmd,             CS_OWN, 0 },
 101         { "write",      db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
 102         { "w",          db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
 103         { "delete",     db_delete_cmd,          0,      0 },
 104         { "d",          db_delete_cmd,          0,      0 },
 105         { "break",      db_breakpoint_cmd,      0,      0 },
 106         { "b",          db_breakpoint_cmd,      0,      0 },
 107         { "dwatch",     db_deletewatch_cmd,     0,      0 },
 108         { "watch",      db_watchpoint_cmd,      CS_MORE,0 },
 109         { "dhwatch",    db_deletehwatch_cmd,    0,      0 },
 110         { "hwatch",     db_hwatchpoint_cmd,     0,      0 },
 111         { "step",       db_single_step_cmd,     0,      0 },
 112         { "s",          db_single_step_cmd,     0,      0 },
 113         { "continue",   db_continue_cmd,        0,      0 },
 114         { "c",          db_continue_cmd,        0,      0 },
 115         { "until",      db_trace_until_call_cmd,0,      0 },
 116         { "next",       db_trace_until_matching_cmd,0,  0 },
 117         { "match",      db_trace_until_matching_cmd,0,  0 },
 118         { "trace",      db_stack_trace,         CS_OWN, 0 },
 119         { "t",          db_stack_trace,         CS_OWN, 0 },
 120         /* XXX alias for all trace */
 121         { "alltrace",   db_stack_trace_all,     0,      0 },
 122         { "where",      db_stack_trace,         CS_OWN, 0 },
 123         { "bt",         db_stack_trace,         CS_OWN, 0 },
 124         { "call",       db_fncall,              CS_OWN, 0 },
 125         { "show",       0,                      0,      &db_show_table },
 126         { "ps",         db_ps,                  0,      0 },
 127         { "gdb",        db_gdb,                 0,      0 },
 128         { "halt",       db_halt,                0,      0 },
 129         { "reboot",     db_reset,               0,      0 },
 130         { "reset",      db_reset,               0,      0 },
 131         { "kill",       db_kill,                CS_OWN, 0 },
 132         { "watchdog",   db_watchdog,            0,      0 },
 133         { "thread",     db_set_thread,          CS_OWN, 0 },
 134         { "run",        db_run_cmd,             CS_OWN, 0 },
 135         { "script",     db_script_cmd,          CS_OWN, 0 },
 136         { "scripts",    db_scripts_cmd,         0,      0 },
 137         { "unscript",   db_unscript_cmd,        CS_OWN, 0 },
 138         { "capture",    db_capture_cmd,         CS_OWN, 0 },
 139         { "textdump",   db_textdump_cmd,        CS_OWN, 0 },
 140 };
 141 struct command_table db_cmd_table = LIST_HEAD_INITIALIZER(db_cmd_table);
 142
 143 static struct command   *db_last_command = 0;
 144
 145 /*
 146  * if 'ed' style: 'dot' is set at start of last item printed,
 147  * and '+' points to next line.
 148  * Otherwise: 'dot' points to next item, '..' points to last.
 149  */
 150 static boolean_t        db_ed_style = TRUE;
 151
 152 /*
 153  * Utility routine - discard tokens through end-of-line.
 154  */
 155 void
 156 db_skip_to_eol()
 157 {
 158         int     t;
 159         do {
 160             t = db_read_token();
 161         } while (t != tEOL);
 162 }
 163
 164 /*
 165  * Results of command search.
 166  */
 167 #define CMD_UNIQUE      0
 168 #define CMD_FOUND       1
 169 #define CMD_NONE        2
 170 #define CMD_AMBIGUOUS   3
 171 #define CMD_HELP        4
 172
 173 static void     db_cmd_match(char *name, struct command *cmd,
 174                     struct command **cmdp, int *resultp);
 175 static void     db_cmd_list(struct command_table *table);
 176 static int      db_cmd_search(char *name, struct command_table *table,
 177                     struct command **cmdp);
 178 static void     db_command(struct command **last_cmdp,
 179                     struct command_table *cmd_table, int dopager);
 180
 181 /*
 182  * Initialize the command lists from the static tables.
 183  */
 184 void
 185 db_command_init(void)
 186 {
 187 #define N(a)    (sizeof(a) / sizeof(a[0]))
 188         int i;
 189
 190         for (i = 0; i < N(db_cmds); i++)
 191                 db_command_register(&db_cmd_table, &db_cmds[i]);
 192         for (i = 0; i < N(db_show_cmds); i++)
 193                 db_command_register(&db_show_table, &db_show_cmds[i]);
 194         for (i = 0; i < N(db_show_all_cmds); i++)
 195                 db_command_register(&db_show_all_table, &db_show_all_cmds[i]);
 196 #undef N
 197 }
 198
 199 /*
 200  * Register a command.
 201  */
 202 void
 203 db_command_register(struct command_table *list, struct command *cmd)
 204 {
 205         struct command *c, *last;
 206
 207         last = NULL;
 208         LIST_FOREACH(c, list, next) {
 209                 int n = strcmp(cmd->name, c->name);
 210
 211                 /* Check that the command is not already present. */
 212                 if (n == 0) {
 213                         printf("%s: Warning, the command \"%s\" already exists;"
 214                              " ignoring request\n", __func__, cmd->name);
 215                         return;
 216                 }
 217                 if (n < 0) {
 218                         /* NB: keep list sorted lexicographically */
 219                         LIST_INSERT_BEFORE(c, cmd, next);
 220                         return;
 221                 }
 222                 last = c;
 223         }
 224         if (last == NULL)
 225                 LIST_INSERT_HEAD(list, cmd, next);
 226         else
 227                 LIST_INSERT_AFTER(last, cmd, next);
 228 }
 229
 230 /*
 231  * Remove a command previously registered with db_command_register.
 232  */
 233 void
 234 db_command_unregister(struct command_table *list, struct command *cmd)
 235 {
 236         struct command *c;
 237
 238         LIST_FOREACH(c, list, next) {
 239                 if (cmd == c) {
 240                         LIST_REMOVE(cmd, next);
 241                         return;
 242                 }
 243         }
 244         /* NB: intentionally quiet */
 245 }
 246
 247 /*
 248  * Helper function to match a single command.
 249  */
 250 static void
 251 db_cmd_match(name, cmd, cmdp, resultp)
 252         char *          name;
 253         struct command  *cmd;
 254         struct command  **cmdp; /* out */
 255         int *           resultp;
 256 {
 257         char *lp, *rp;
 258         int c;
 259
 260         lp = name;
 261         rp = cmd->name;
 262         while ((c = *lp) == *rp) {
 263                 if (c == 0) {
 264                         /* complete match */
 265                         *cmdp = cmd;
 266                         *resultp = CMD_UNIQUE;
 267                         return;
 268                 }
 269                 lp++;
 270                 rp++;
 271         }
 272         if (c == 0) {
 273                 /* end of name, not end of command -
 274                    partial match */
 275                 if (*resultp == CMD_FOUND) {
 276                         *resultp = CMD_AMBIGUOUS;
 277                         /* but keep looking for a full match -
 278                            this lets us match single letters */
 279                 } else {
 280                         *cmdp = cmd;
 281                         *resultp = CMD_FOUND;
 282                 }
 283         }
 284 }
 285
 286 /*
 287  * Search for command prefix.
 288  */
 289 static int
 290 db_cmd_search(name, table, cmdp)
 291         char *          name;
 292         struct command_table *table;
 293         struct command  **cmdp; /* out */
 294 {
 295         struct command  *cmd;
 296         int             result = CMD_NONE;
 297
 298         LIST_FOREACH(cmd, table, next) {
 299                 db_cmd_match(name,cmd,cmdp,&result);
 300                 if (result == CMD_UNIQUE)
 301                         break;
 302         }
 303
 304         if (result == CMD_NONE) {
 305                 /* check for 'help' */
 306                 if (name[0] == 'h' && name[1] == 'e'
 307                     && name[2] == 'l' && name[3] == 'p')
 308                         result = CMD_HELP;
 309         }
 310         return (result);
 311 }
 312
 313 static void
 314 db_cmd_list(table)
 315         struct command_table *table;
 316 {
 317         register struct command *cmd;
 318
 319         LIST_FOREACH(cmd, table, next) {
 320                 db_printf("%-12s", cmd->name);
 321                 db_end_line(12);
 322         }
 323 }
 324
 325 static void
 326 db_command(last_cmdp, cmd_table, dopager)
 327         struct command  **last_cmdp;    /* IN_OUT */
 328         struct command_table *cmd_table;
 329         int dopager;
 330 {
 331         struct command  *cmd = NULL;
 332         int             t;
 333         char            modif[TOK_STRING_SIZE];
 334         db_expr_t       addr, count;
 335         boolean_t       have_addr = FALSE;
 336         int             result;
 337
 338         t = db_read_token();
 339         if (t == tEOL) {
 340             /* empty line repeats last command, at 'next' */
 341             cmd = *last_cmdp;
 342             addr = (db_expr_t)db_next;
 343             have_addr = FALSE;
 344             count = 1;
 345             modif[0] = '\0';
 346         }
 347         else if (t == tEXCL) {
 348             db_fncall((db_expr_t)0, (boolean_t)0, (db_expr_t)0, (char *)0);
 349             return;
 350         }
 351         else if (t != tIDENT) {
 352             db_printf("?\n");
 353             db_flush_lex();
 354             return;
 355         }
 356         else {
 357             /*
 358              * Search for command
 359              */
 360             while (cmd_table) {
 361                 result = db_cmd_search(db_tok_string,
 362                                        cmd_table,
 363                                        &cmd);
 364                 switch (result) {
 365                     case CMD_NONE:
 366                         db_printf("No such command\n");
 367                         db_flush_lex();
 368                         return;
 369                     case CMD_AMBIGUOUS:
 370                         db_printf("Ambiguous\n");
 371                         db_flush_lex();
 372                         return;
 373                     case CMD_HELP:
 374                         db_cmd_list(cmd_table);
 375                         db_flush_lex();
 376                         return;
 377                     default:
 378                         break;
 379                 }
 380                 if ((cmd_table = cmd->more) != NULL) {
 381                     t = db_read_token();
 382                     if (t != tIDENT) {
 383                         db_cmd_list(cmd_table);
 384                         db_flush_lex();
 385                         return;
 386                     }
 387                 }
 388             }
 389
 390             if ((cmd->flag & CS_OWN) == 0) {
 391                 /*
 392                  * Standard syntax:
 393                  * command [/modifier] [addr] [,count]
 394                  */
 395                 t = db_read_token();
 396                 if (t == tSLASH) {
 397                     t = db_read_token();
 398                     if (t != tIDENT) {
 399                         db_printf("Bad modifier\n");
 400                         db_flush_lex();
 401                         return;
 402                     }
 403                     db_strcpy(modif, db_tok_string);
 404                 }
 405                 else {
 406                     db_unread_token(t);
 407                     modif[0] = '\0';
 408                 }
 409
 410                 if (db_expression(&addr)) {
 411                     db_dot = (db_addr_t) addr;
 412                     db_last_addr = db_dot;
 413                     have_addr = TRUE;
 414                 }
 415                 else {
 416                     addr = (db_expr_t) db_dot;
 417                     have_addr = FALSE;
 418                 }
 419                 t = db_read_token();
 420                 if (t == tCOMMA) {
 421                     if (!db_expression(&count)) {
 422                         db_printf("Count missing\n");
 423                         db_flush_lex();
 424                         return;
 425                     }
 426                 }
 427                 else {
 428                     db_unread_token(t);
 429                     count = -1;
 430                 }
 431                 if ((cmd->flag & CS_MORE) == 0) {
 432                     db_skip_to_eol();
 433                 }
 434             }
 435         }
 436         *last_cmdp = cmd;
 437         if (cmd != 0) {
 438             /*
 439              * Execute the command.
 440              */
 441             if (dopager)
 442                 db_enable_pager();
 443             else
 444                 db_disable_pager();
 445             (*cmd->fcn)(addr, have_addr, count, modif);
 446             if (dopager)
 447                 db_disable_pager();
 448
 449             if (cmd->flag & CS_SET_DOT) {
 450                 /*
 451                  * If command changes dot, set dot to
 452                  * previous address displayed (if 'ed' style).
 453                  */
 454                 if (db_ed_style) {
 455                     db_dot = db_prev;
 456                 }
 457                 else {
 458                     db_dot = db_next;
 459                 }
 460             }
 461             else {
 462                 /*
 463                  * If command does not change dot,
 464                  * set 'next' location to be the same.
 465                  */
 466                 db_next = db_dot;
 467             }
 468         }
 469 }
 470
 471 /*
 472  * At least one non-optional command must be implemented using
 473  * DB_COMMAND() so that db_cmd_set gets created.  Here is one.
 474  */
 475 DB_COMMAND(panic, db_panic)
 476 {
 477         db_disable_pager();
 478         panic("from debugger");
 479 }
 480
 481 void
 482 db_command_loop()
 483 {
 484         /*
 485          * Initialize 'prev' and 'next' to dot.
 486          */
 487         db_prev = db_dot;
 488         db_next = db_dot;
 489
 490         db_cmd_loop_done = 0;
 491         while (!db_cmd_loop_done) {
 492             if (db_print_position() != 0)
 493                 db_printf("\n");
 494
 495             db_printf("db> ");
 496             (void) db_read_line();
 497
 498             db_command(&db_last_command, &db_cmd_table, /* dopager */ 1);
 499         }
 500 }
 501
 502 /*
 503  * Execute a command on behalf of a script.  The caller is responsible for
 504  * making sure that the command string is < DB_MAXLINE or it will be
 505  * truncated.
 506  *
 507  * XXXRW: Runs by injecting faked input into DDB input stream; it would be
 508  * nicer to use an alternative approach that didn't mess with the previous
 509  * command buffer.
 510  */
 511 void
 512 db_command_script(const char *command)
 513 {
 514         db_prev = db_next = db_dot;
 515         db_inject_line(command);
 516         db_command(&db_last_command, &db_cmd_table, /* dopager */ 0);
 517 }
 518
 519 void
 520 db_error(s)
 521         const char *s;
 522 {
 523         if (s)
 524             db_printf("%s", s);
 525         db_flush_lex();
 526         kdb_reenter();
 527 }
 528
 529
 530 /*
 531  * Call random function:
 532  * !expr(arg,arg,arg)
 533  */
 534
 535 /* The generic implementation supports a maximum of 10 arguments. */
 536 typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t,
 537     db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t);
 538
 539 static __inline int
 540 db_fncall_generic(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[])
 541 {
 542         __db_f *f = (__db_f *)addr;
 543
 544         if (nargs > 10) {
 545                 db_printf("Too many arguments (max 10)\n");
 546                 return (0);
 547         }
 548         *rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5],
 549             args[6], args[7], args[8], args[9]);
 550         return (1);
 551 }
 552
 553 static void
 554 db_fncall(dummy1, dummy2, dummy3, dummy4)
 555         db_expr_t       dummy1;
 556         boolean_t       dummy2;
 557         db_expr_t       dummy3;
 558         char *          dummy4;
 559 {
 560         db_expr_t       fn_addr;
 561         db_expr_t       args[DB_MAXARGS];
 562         int             nargs = 0;
 563         db_expr_t       retval;
 564         int             t;
 565
 566         if (!db_expression(&fn_addr)) {
 567             db_printf("Bad function\n");
 568             db_flush_lex();
 569             return;
 570         }
 571
 572         t = db_read_token();
 573         if (t == tLPAREN) {
 574             if (db_expression(&args[0])) {
 575                 nargs++;
 576                 while ((t = db_read_token()) == tCOMMA) {
 577                     if (nargs == DB_MAXARGS) {
 578                         db_printf("Too many arguments (max %d)\n", DB_MAXARGS);
 579                         db_flush_lex();
 580                         return;
 581                     }
 582                     if (!db_expression(&args[nargs])) {
 583                         db_printf("Argument missing\n");
 584                         db_flush_lex();
 585                         return;
 586                     }
 587                     nargs++;
 588                 }
 589                 db_unread_token(t);
 590             }
 591             if (db_read_token() != tRPAREN) {
 592                 db_printf("?\n");
 593                 db_flush_lex();
 594                 return;
 595             }
 596         }
 597         db_skip_to_eol();
 598         db_disable_pager();
 599
 600         if (DB_CALL(fn_addr, &retval, nargs, args))
 601                 db_printf("= %#lr\n", (long)retval);
 602 }
 603
 604 static void
 605 db_halt(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
 606 {
 607
 608         cpu_halt();
 609 }
 610
 611 static void
 612 db_kill(dummy1, dummy2, dummy3, dummy4)
 613         db_expr_t       dummy1;
 614         boolean_t       dummy2;
 615         db_expr_t       dummy3;
 616         char *          dummy4;
 617 {
 618         db_expr_t old_radix, pid, sig;
 619         struct proc *p;
 620
 621 #define DB_ERROR(f)     do { db_printf f; db_flush_lex(); goto out; } while (0)
 622
 623         /*
 624          * PIDs and signal numbers are typically represented in base
 625          * 10, so make that the default here.  It can, of course, be
 626          * overridden by specifying a prefix.
 627          */
 628         old_radix = db_radix;
 629         db_radix = 10;
 630         /* Retrieve arguments. */
 631         if (!db_expression(&sig))
 632                 DB_ERROR(("Missing signal number\n"));
 633         if (!db_expression(&pid))
 634                 DB_ERROR(("Missing process ID\n"));
 635         db_skip_to_eol();
 636         if (sig < 1 || sig > _SIG_MAXSIG)
 637                 DB_ERROR(("Signal number out of range\n"));
 638
 639         /*
 640          * Find the process in question.  allproc_lock is not needed
 641          * since we're in DDB.
 642          */
 643         /* sx_slock(&allproc_lock); */
 644         FOREACH_PROC_IN_SYSTEM(p)
 645             if (p->p_pid == pid)
 646                     break;
 647         /* sx_sunlock(&allproc_lock); */
 648         if (p == NULL)
 649                 DB_ERROR(("Can't find process with pid %ld\n", (long) pid));
 650
 651         /* If it's already locked, bail; otherwise, do the deed. */
 652         if (PROC_TRYLOCK(p) == 0)
 653                 DB_ERROR(("Can't lock process with pid %ld\n", (long) pid));
 654         else {
 655                 pksignal(p, sig, NULL);
 656                 PROC_UNLOCK(p);
 657         }
 658
 659 out:
 660         db_radix = old_radix;
 661 #undef DB_ERROR
 662 }
 663
 664 static void
 665 db_reset(dummy1, dummy2, dummy3, dummy4)
 666         db_expr_t       dummy1;
 667         boolean_t       dummy2;
 668         db_expr_t       dummy3;
 669         char *          dummy4;
 670 {
 671
 672         cpu_reset();
 673 }
 674
 675 static void
 676 db_watchdog(dummy1, dummy2, dummy3, dummy4)
 677         db_expr_t       dummy1;
 678         boolean_t       dummy2;
 679         db_expr_t       dummy3;
 680         char *          dummy4;
 681 {
 682         int i;
 683
 684         /*
 685          * XXX: It might make sense to be able to set the watchdog to a
 686          * XXX: timeout here so that failure or hang as a result of subsequent
 687          * XXX: ddb commands could be recovered by a reset.
 688          */
 689
 690         EVENTHANDLER_INVOKE(watchdog_list, 0, &i);
 691 }
 692
 693 static void
 694 db_gdb(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
 695 {
 696
 697         if (kdb_dbbe_select("gdb") != 0)
 698                 db_printf("The remote GDB backend could not be selected.\n");
 699         else
 700                 db_printf("Step to enter the remote GDB backend.\n");
 701 }
 702
 703 static void
 704 db_stack_trace(db_expr_t tid, boolean_t hastid, db_expr_t count, char *modif)
 705 {
 706         struct thread *td;
 707         db_expr_t radix;
 708         pid_t pid;
 709         int t;
 710
 711         /*
 712          * We parse our own arguments. We don't like the default radix.
 713          */
 714         radix = db_radix;
 715         db_radix = 10;
 716         hastid = db_expression(&tid);
 717         t = db_read_token();
 718         if (t == tCOMMA) {
 719                 if (!db_expression(&count)) {
 720                         db_printf("Count missing\n");
 721                         db_flush_lex();
 722                         return;
 723                 }
 724         } else {
 725                 db_unread_token(t);
 726                 count = -1;
 727         }
 728         db_skip_to_eol();
 729         db_radix = radix;
 730
 731         if (hastid) {
 732                 td = kdb_thr_lookup((lwpid_t)tid);
 733                 if (td == NULL)
 734                         td = kdb_thr_from_pid((pid_t)tid);
 735                 if (td == NULL) {
 736                         db_printf("Thread %d not found\n", (int)tid);
 737                         return;
 738                 }
 739         } else
 740                 td = kdb_thread;
 741         if (td->td_proc != NULL)
 742                 pid = td->td_proc->p_pid;
 743         else
 744                 pid = -1;
 745         db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td);
 746         db_trace_thread(td, count);
 747 }
 748
 749 static void
 750 db_stack_trace_all(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3,
 751     char *dummy4)
 752 {
 753         struct proc *p;
 754         struct thread *td;
 755         jmp_buf jb;
 756         void *prev_jb;
 757
 758         FOREACH_PROC_IN_SYSTEM(p) {
 759                 prev_jb = kdb_jmpbuf(jb);
 760                 if (setjmp(jb) == 0) {
 761                         FOREACH_THREAD_IN_PROC(p, td) {
 762                                 db_printf("\nTracing command %s pid %d tid %ld td %p\n",
 763                                           p->p_comm, p->p_pid, (long)td->td_tid, td);
 764                                 db_trace_thread(td, -1);
 765                                 if (db_pager_quit) {
 766                                         kdb_jmpbuf(prev_jb);
 767                                         return;
 768                                 }
 769                         }
 770                 }
 771                 kdb_jmpbuf(prev_jb);
 772         }
 773 }