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/conf.h>
  48 #include <sys/watchdog.h>
  49 #include <sys/kernel.h>
  50
  51 #include <ddb/ddb.h>
  52 #include <ddb/db_command.h>
  53 #include <ddb/db_lex.h>
  54 #include <ddb/db_output.h>
  55
  56 #include <machine/cpu.h>
  57 #include <machine/setjmp.h>
  58
  59 /*
  60  * Exported global variables
  61  */
  62 boolean_t       db_cmd_loop_done;
  63 db_addr_t       db_dot;
  64 db_addr_t       db_last_addr;
  65 db_addr_t       db_prev;
  66 db_addr_t       db_next;
  67
  68 static db_cmdfcn_t      db_dump;
  69 static db_cmdfcn_t      db_fncall;
  70 static db_cmdfcn_t      db_gdb;
  71 static db_cmdfcn_t      db_halt;
  72 static db_cmdfcn_t      db_kill;
  73 static db_cmdfcn_t      db_reset;
  74 static db_cmdfcn_t      db_stack_trace;
  75 static db_cmdfcn_t      db_stack_trace_all;
  76 static db_cmdfcn_t      db_watchdog;
  77
  78 /*
  79  * 'show' commands
  80  */
  81
  82 static struct command db_show_all_cmds[] = {
  83         { "trace",      db_stack_trace_all,     0,      0 },
  84 };
  85 struct command_table db_show_all_table =
  86     LIST_HEAD_INITIALIZER(db_show_all_table);
  87
  88 static struct command db_show_cmds[] = {
  89         { "all",        0,                      0,      &db_show_all_table },
  90         { "registers",  db_show_regs,           0,      0 },
  91         { "breaks",     db_listbreak_cmd,       0,      0 },
  92         { "threads",    db_show_threads,        0,      0 },
  93 };
  94 struct command_table db_show_table = LIST_HEAD_INITIALIZER(db_show_table);
  95
  96 static struct command db_cmds[] = {
  97         { "print",      db_print_cmd,           0,      0 },
  98         { "p",          db_print_cmd,           0,      0 },
  99         { "examine",    db_examine_cmd,         CS_SET_DOT, 0 },
 100         { "x",          db_examine_cmd,         CS_SET_DOT, 0 },
 101         { "search",     db_search_cmd,          CS_OWN|CS_SET_DOT, 0 },
 102         { "set",        db_set_cmd,             CS_OWN, 0 },
 103         { "write",      db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
 104         { "w",          db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
 105         { "delete",     db_delete_cmd,          0,      0 },
 106         { "d",          db_delete_cmd,          0,      0 },
 107         { "dump",       db_dump,                0,      0 },
 108         { "break",      db_breakpoint_cmd,      0,      0 },
 109         { "b",          db_breakpoint_cmd,      0,      0 },
 110         { "dwatch",     db_deletewatch_cmd,     0,      0 },
 111         { "watch",      db_watchpoint_cmd,      CS_MORE,0 },
 112         { "dhwatch",    db_deletehwatch_cmd,    0,      0 },
 113         { "hwatch",     db_hwatchpoint_cmd,     0,      0 },
 114         { "step",       db_single_step_cmd,     0,      0 },
 115         { "s",          db_single_step_cmd,     0,      0 },
 116         { "continue",   db_continue_cmd,        0,      0 },
 117         { "c",          db_continue_cmd,        0,      0 },
 118         { "until",      db_trace_until_call_cmd,0,      0 },
 119         { "next",       db_trace_until_matching_cmd,0,  0 },
 120         { "match",      db_trace_until_matching_cmd,0,  0 },
 121         { "trace",      db_stack_trace,         CS_OWN, 0 },
 122         { "t",          db_stack_trace,         CS_OWN, 0 },
 123         /* XXX alias for all trace */
 124         { "alltrace",   db_stack_trace_all,     0,      0 },
 125         { "where",      db_stack_trace,         CS_OWN, 0 },
 126         { "bt",         db_stack_trace,         CS_OWN, 0 },
 127         { "call",       db_fncall,              CS_OWN, 0 },
 128         { "show",       0,                      0,      &db_show_table },
 129         { "ps",         db_ps,                  0,      0 },
 130         { "gdb",        db_gdb,                 0,      0 },
 131         { "halt",       db_halt,                0,      0 },
 132         { "reboot",     db_reset,               0,      0 },
 133         { "reset",      db_reset,               0,      0 },
 134         { "kill",       db_kill,                CS_OWN, 0 },
 135         { "watchdog",   db_watchdog,            CS_OWN, 0 },
 136         { "thread",     db_set_thread,          CS_OWN, 0 },
 137         { "run",        db_run_cmd,             CS_OWN, 0 },
 138         { "script",     db_script_cmd,          CS_OWN, 0 },
 139         { "scripts",    db_scripts_cmd,         0,      0 },
 140         { "unscript",   db_unscript_cmd,        CS_OWN, 0 },
 141         { "capture",    db_capture_cmd,         CS_OWN, 0 },
 142         { "textdump",   db_textdump_cmd,        CS_OWN, 0 },
 143         { "findstack",  db_findstack_cmd,       0,      0 },
 144 };
 145 struct command_table db_cmd_table = LIST_HEAD_INITIALIZER(db_cmd_table);
 146
 147 static struct command   *db_last_command = 0;
 148
 149 /*
 150  * if 'ed' style: 'dot' is set at start of last item printed,
 151  * and '+' points to next line.
 152  * Otherwise: 'dot' points to next item, '..' points to last.
 153  */
 154 static boolean_t        db_ed_style = TRUE;
 155
 156 /*
 157  * Utility routine - discard tokens through end-of-line.
 158  */
 159 void
 160 db_skip_to_eol()
 161 {
 162         int     t;
 163         do {
 164             t = db_read_token();
 165         } while (t != tEOL);
 166 }
 167
 168 /*
 169  * Results of command search.
 170  */
 171 #define CMD_UNIQUE      0
 172 #define CMD_FOUND       1
 173 #define CMD_NONE        2
 174 #define CMD_AMBIGUOUS   3
 175 #define CMD_HELP        4
 176
 177 static void     db_cmd_match(char *name, struct command *cmd,
 178                     struct command **cmdp, int *resultp);
 179 static void     db_cmd_list(struct command_table *table);
 180 static int      db_cmd_search(char *name, struct command_table *table,
 181                     struct command **cmdp);
 182 static void     db_command(struct command **last_cmdp,
 183                     struct command_table *cmd_table, int dopager);
 184
 185 /*
 186  * Initialize the command lists from the static tables.
 187  */
 188 void
 189 db_command_init(void)
 190 {
 191 #define N(a)    (sizeof(a) / sizeof(a[0]))
 192         int i;
 193
 194         for (i = 0; i < N(db_cmds); i++)
 195                 db_command_register(&db_cmd_table, &db_cmds[i]);
 196         for (i = 0; i < N(db_show_cmds); i++)
 197                 db_command_register(&db_show_table, &db_show_cmds[i]);
 198         for (i = 0; i < N(db_show_all_cmds); i++)
 199                 db_command_register(&db_show_all_table, &db_show_all_cmds[i]);
 200 #undef N
 201 }
 202
 203 /*
 204  * Register a command.
 205  */
 206 void
 207 db_command_register(struct command_table *list, struct command *cmd)
 208 {
 209         struct command *c, *last;
 210
 211         last = NULL;
 212         LIST_FOREACH(c, list, next) {
 213                 int n = strcmp(cmd->name, c->name);
 214
 215                 /* Check that the command is not already present. */
 216                 if (n == 0) {
 217                         printf("%s: Warning, the command \"%s\" already exists;"
 218                              " ignoring request\n", __func__, cmd->name);
 219                         return;
 220                 }
 221                 if (n < 0) {
 222                         /* NB: keep list sorted lexicographically */
 223                         LIST_INSERT_BEFORE(c, cmd, next);
 224                         return;
 225                 }
 226                 last = c;
 227         }
 228         if (last == NULL)
 229                 LIST_INSERT_HEAD(list, cmd, next);
 230         else
 231                 LIST_INSERT_AFTER(last, cmd, next);
 232 }
 233
 234 /*
 235  * Remove a command previously registered with db_command_register.
 236  */
 237 void
 238 db_command_unregister(struct command_table *list, struct command *cmd)
 239 {
 240         struct command *c;
 241
 242         LIST_FOREACH(c, list, next) {
 243                 if (cmd == c) {
 244                         LIST_REMOVE(cmd, next);
 245                         return;
 246                 }
 247         }
 248         /* NB: intentionally quiet */
 249 }
 250
 251 /*
 252  * Helper function to match a single command.
 253  */
 254 static void
 255 db_cmd_match(name, cmd, cmdp, resultp)
 256         char *          name;
 257         struct command  *cmd;
 258         struct command  **cmdp; /* out */
 259         int *           resultp;
 260 {
 261         char *lp, *rp;
 262         int c;
 263
 264         lp = name;
 265         rp = cmd->name;
 266         while ((c = *lp) == *rp) {
 267                 if (c == 0) {
 268                         /* complete match */
 269                         *cmdp = cmd;
 270                         *resultp = CMD_UNIQUE;
 271                         return;
 272                 }
 273                 lp++;
 274                 rp++;
 275         }
 276         if (c == 0) {
 277                 /* end of name, not end of command -
 278                    partial match */
 279                 if (*resultp == CMD_FOUND) {
 280                         *resultp = CMD_AMBIGUOUS;
 281                         /* but keep looking for a full match -
 282                            this lets us match single letters */
 283                 } else {
 284                         *cmdp = cmd;
 285                         *resultp = CMD_FOUND;
 286                 }
 287         }
 288 }
 289
 290 /*
 291  * Search for command prefix.
 292  */
 293 static int
 294 db_cmd_search(name, table, cmdp)
 295         char *          name;
 296         struct command_table *table;
 297         struct command  **cmdp; /* out */
 298 {
 299         struct command  *cmd;
 300         int             result = CMD_NONE;
 301
 302         LIST_FOREACH(cmd, table, next) {
 303                 db_cmd_match(name,cmd,cmdp,&result);
 304                 if (result == CMD_UNIQUE)
 305                         break;
 306         }
 307
 308         if (result == CMD_NONE) {
 309                 /* check for 'help' */
 310                 if (name[0] == 'h' && name[1] == 'e'
 311                     && name[2] == 'l' && name[3] == 'p')
 312                         result = CMD_HELP;
 313         }
 314         return (result);
 315 }
 316
 317 static void
 318 db_cmd_list(table)
 319         struct command_table *table;
 320 {
 321         register struct command *cmd;
 322
 323         LIST_FOREACH(cmd, table, next) {
 324                 db_printf("%-12s", cmd->name);
 325                 db_end_line(12);
 326         }
 327 }
 328
 329 static void
 330 db_command(last_cmdp, cmd_table, dopager)
 331         struct command  **last_cmdp;    /* IN_OUT */
 332         struct command_table *cmd_table;
 333         int dopager;
 334 {
 335         struct command  *cmd = NULL;
 336         int             t;
 337         char            modif[TOK_STRING_SIZE];
 338         db_expr_t       addr, count;
 339         boolean_t       have_addr = FALSE;
 340         int             result;
 341
 342         t = db_read_token();
 343         if (t == tEOL) {
 344             /* empty line repeats last command, at 'next' */
 345             cmd = *last_cmdp;
 346             addr = (db_expr_t)db_next;
 347             have_addr = FALSE;
 348             count = 1;
 349             modif[0] = '\0';
 350         }
 351         else if (t == tEXCL) {
 352             db_fncall((db_expr_t)0, (boolean_t)0, (db_expr_t)0, (char *)0);
 353             return;
 354         }
 355         else if (t != tIDENT) {
 356             db_printf("?\n");
 357             db_flush_lex();
 358             return;
 359         }
 360         else {
 361             /*
 362              * Search for command
 363              */
 364             while (cmd_table) {
 365                 result = db_cmd_search(db_tok_string,
 366                                        cmd_table,
 367                                        &cmd);
 368                 switch (result) {
 369                     case CMD_NONE:
 370                         db_printf("No such command\n");
 371                         db_flush_lex();
 372                         return;
 373                     case CMD_AMBIGUOUS:
 374                         db_printf("Ambiguous\n");
 375                         db_flush_lex();
 376                         return;
 377                     case CMD_HELP:
 378                         db_cmd_list(cmd_table);
 379                         db_flush_lex();
 380                         return;
 381                     default:
 382                         break;
 383                 }
 384                 if ((cmd_table = cmd->more) != NULL) {
 385                     t = db_read_token();
 386                     if (t != tIDENT) {
 387                         db_cmd_list(cmd_table);
 388                         db_flush_lex();
 389                         return;
 390                     }
 391                 }
 392             }
 393
 394             if ((cmd->flag & CS_OWN) == 0) {
 395                 /*
 396                  * Standard syntax:
 397                  * command [/modifier] [addr] [,count]
 398                  */
 399                 t = db_read_token();
 400                 if (t == tSLASH) {
 401                     t = db_read_token();
 402                     if (t != tIDENT) {
 403                         db_printf("Bad modifier\n");
 404                         db_flush_lex();
 405                         return;
 406                     }
 407                     db_strcpy(modif, db_tok_string);
 408                 }
 409                 else {
 410                     db_unread_token(t);
 411                     modif[0] = '\0';
 412                 }
 413
 414                 if (db_expression(&addr)) {
 415                     db_dot = (db_addr_t) addr;
 416                     db_last_addr = db_dot;
 417                     have_addr = TRUE;
 418                 }
 419                 else {
 420                     addr = (db_expr_t) db_dot;
 421                     have_addr = FALSE;
 422                 }
 423                 t = db_read_token();
 424                 if (t == tCOMMA) {
 425                     if (!db_expression(&count)) {
 426                         db_printf("Count missing\n");
 427                         db_flush_lex();
 428                         return;
 429                     }
 430                 }
 431                 else {
 432                     db_unread_token(t);
 433                     count = -1;
 434                 }
 435                 if ((cmd->flag & CS_MORE) == 0) {
 436                     db_skip_to_eol();
 437                 }
 438             }
 439         }
 440         *last_cmdp = cmd;
 441         if (cmd != 0) {
 442             /*
 443              * Execute the command.
 444              */
 445             if (dopager)
 446                 db_enable_pager();
 447             else
 448                 db_disable_pager();
 449             (*cmd->fcn)(addr, have_addr, count, modif);
 450             if (dopager)
 451                 db_disable_pager();
 452
 453             if (cmd->flag & CS_SET_DOT) {
 454                 /*
 455                  * If command changes dot, set dot to
 456                  * previous address displayed (if 'ed' style).
 457                  */
 458                 if (db_ed_style) {
 459                     db_dot = db_prev;
 460                 }
 461                 else {
 462                     db_dot = db_next;
 463                 }
 464             }
 465             else {
 466                 /*
 467                  * If command does not change dot,
 468                  * set 'next' location to be the same.
 469                  */
 470                 db_next = db_dot;
 471             }
 472         }
 473 }
 474
 475 /*
 476  * At least one non-optional command must be implemented using
 477  * DB_COMMAND() so that db_cmd_set gets created.  Here is one.
 478  */
 479 DB_COMMAND(panic, db_panic)
 480 {
 481         db_disable_pager();
 482         panic("from debugger");
 483 }
 484
 485 void
 486 db_command_loop()
 487 {
 488         /*
 489          * Initialize 'prev' and 'next' to dot.
 490          */
 491         db_prev = db_dot;
 492         db_next = db_dot;
 493
 494         db_cmd_loop_done = 0;
 495         while (!db_cmd_loop_done) {
 496             if (db_print_position() != 0)
 497                 db_printf("\n");
 498
 499             db_printf("db> ");
 500             (void) db_read_line();
 501
 502             db_command(&db_last_command, &db_cmd_table, /* dopager */ 1);
 503         }
 504 }
 505
 506 /*
 507  * Execute a command on behalf of a script.  The caller is responsible for
 508  * making sure that the command string is < DB_MAXLINE or it will be
 509  * truncated.
 510  *
 511  * XXXRW: Runs by injecting faked input into DDB input stream; it would be
 512  * nicer to use an alternative approach that didn't mess with the previous
 513  * command buffer.
 514  */
 515 void
 516 db_command_script(const char *command)
 517 {
 518         db_prev = db_next = db_dot;
 519         db_inject_line(command);
 520         db_command(&db_last_command, &db_cmd_table, /* dopager */ 0);
 521 }
 522
 523 void
 524 db_error(s)
 525         const char *s;
 526 {
 527         if (s)
 528             db_printf("%s", s);
 529         db_flush_lex();
 530         kdb_reenter();
 531 }
 532
 533 static void
 534 db_dump(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
 535 {
 536         int error;
 537
 538         if (textdump_pending) {
 539                 db_printf("textdump_pending set.\n"
 540                     "run \"textdump unset\" first or \"textdump dump\" for a textdump.\n");
 541                 return;
 542         }
 543         error = doadump(FALSE);
 544         if (error) {
 545                 db_printf("Cannot dump: ");
 546                 switch (error) {
 547                 case EBUSY:
 548                         db_printf("debugger got invoked while dumping.\n");
 549                         break;
 550                 case ENXIO:
 551                         db_printf("no dump device specified.\n");
 552                         break;
 553                 default:
 554                         db_printf("unknown error (error=%d).\n", error);
 555                         break;
 556                 }
 557         }
 558 }
 559
 560 /*
 561  * Call random function:
 562  * !expr(arg,arg,arg)
 563  */
 564
 565 /* The generic implementation supports a maximum of 10 arguments. */
 566 typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t,
 567     db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t);
 568
 569 static __inline int
 570 db_fncall_generic(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[])
 571 {
 572         __db_f *f = (__db_f *)addr;
 573
 574         if (nargs > 10) {
 575                 db_printf("Too many arguments (max 10)\n");
 576                 return (0);
 577         }
 578         *rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5],
 579             args[6], args[7], args[8], args[9]);
 580         return (1);
 581 }
 582
 583 static void
 584 db_fncall(dummy1, dummy2, dummy3, dummy4)
 585         db_expr_t       dummy1;
 586         boolean_t       dummy2;
 587         db_expr_t       dummy3;
 588         char *          dummy4;
 589 {
 590         db_expr_t       fn_addr;
 591         db_expr_t       args[DB_MAXARGS];
 592         int             nargs = 0;
 593         db_expr_t       retval;
 594         int             t;
 595
 596         if (!db_expression(&fn_addr)) {
 597             db_printf("Bad function\n");
 598             db_flush_lex();
 599             return;
 600         }
 601
 602         t = db_read_token();
 603         if (t == tLPAREN) {
 604             if (db_expression(&args[0])) {
 605                 nargs++;
 606                 while ((t = db_read_token()) == tCOMMA) {
 607                     if (nargs == DB_MAXARGS) {
 608                         db_printf("Too many arguments (max %d)\n", DB_MAXARGS);
 609                         db_flush_lex();
 610                         return;
 611                     }
 612                     if (!db_expression(&args[nargs])) {
 613                         db_printf("Argument missing\n");
 614                         db_flush_lex();
 615                         return;
 616                     }
 617                     nargs++;
 618                 }
 619                 db_unread_token(t);
 620             }
 621             if (db_read_token() != tRPAREN) {
 622                 db_printf("?\n");
 623                 db_flush_lex();
 624                 return;
 625             }
 626         }
 627         db_skip_to_eol();
 628         db_disable_pager();
 629
 630         if (DB_CALL(fn_addr, &retval, nargs, args))
 631                 db_printf("= %#lr\n", (long)retval);
 632 }
 633
 634 static void
 635 db_halt(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
 636 {
 637
 638         cpu_halt();
 639 }
 640
 641 static void
 642 db_kill(dummy1, dummy2, dummy3, dummy4)
 643         db_expr_t       dummy1;
 644         boolean_t       dummy2;
 645         db_expr_t       dummy3;
 646         char *          dummy4;
 647 {
 648         db_expr_t old_radix, pid, sig;
 649         struct proc *p;
 650
 651 #define DB_ERROR(f)     do { db_printf f; db_flush_lex(); goto out; } while (0)
 652
 653         /*
 654          * PIDs and signal numbers are typically represented in base
 655          * 10, so make that the default here.  It can, of course, be
 656          * overridden by specifying a prefix.
 657          */
 658         old_radix = db_radix;
 659         db_radix = 10;
 660         /* Retrieve arguments. */
 661         if (!db_expression(&sig))
 662                 DB_ERROR(("Missing signal number\n"));
 663         if (!db_expression(&pid))
 664                 DB_ERROR(("Missing process ID\n"));
 665         db_skip_to_eol();
 666         if (!_SIG_VALID(sig))
 667                 DB_ERROR(("Signal number out of range\n"));
 668
 669         /*
 670          * Find the process in question.  allproc_lock is not needed
 671          * since we're in DDB.
 672          */
 673         /* sx_slock(&allproc_lock); */
 674         FOREACH_PROC_IN_SYSTEM(p)
 675             if (p->p_pid == pid)
 676                     break;
 677         /* sx_sunlock(&allproc_lock); */
 678         if (p == NULL)
 679                 DB_ERROR(("Can't find process with pid %ld\n", (long) pid));
 680
 681         /* If it's already locked, bail; otherwise, do the deed. */
 682         if (PROC_TRYLOCK(p) == 0)
 683                 DB_ERROR(("Can't lock process with pid %ld\n", (long) pid));
 684         else {
 685                 pksignal(p, sig, NULL);
 686                 PROC_UNLOCK(p);
 687         }
 688
 689 out:
 690         db_radix = old_radix;
 691 #undef DB_ERROR
 692 }
 693
 694 /*
 695  * Reboot.  In case there is an additional argument, take it as delay in
 696  * seconds.  Default to 15s if we cannot parse it and make sure we will
 697  * never wait longer than 1 week.  Some code is similar to
 698  * kern_shutdown.c:shutdown_panic().
 699  */
 700 #ifndef DB_RESET_MAXDELAY
 701 #define DB_RESET_MAXDELAY       (3600 * 24 * 7)
 702 #endif
 703
 704 static void
 705 db_reset(db_expr_t addr, boolean_t have_addr, db_expr_t count __unused,
 706     char *modif __unused)
 707 {
 708         int delay, loop;
 709
 710         if (have_addr) {
 711                 delay = (int)db_hex2dec(addr);
 712
 713                 /* If we parse to fail, use 15s. */
 714                 if (delay == -1)
 715                         delay = 15;
 716
 717                 /* Cap at one week. */
 718                 if ((uintmax_t)delay > (uintmax_t)DB_RESET_MAXDELAY)
 719                         delay = DB_RESET_MAXDELAY;
 720
 721                 db_printf("Automatic reboot in %d seconds - "
 722                     "press a key on the console to abort\n", delay);
 723                 for (loop = delay * 10; loop > 0; --loop) {
 724                         DELAY(1000 * 100); /* 1/10th second */
 725                         /* Did user type a key? */
 726                         if (cncheckc() != -1)
 727                                 return;
 728                 }
 729         }
 730
 731         cpu_reset();
 732 }
 733
 734 static void
 735 db_watchdog(dummy1, dummy2, dummy3, dummy4)
 736         db_expr_t       dummy1;
 737         boolean_t       dummy2;
 738         db_expr_t       dummy3;
 739         char *          dummy4;
 740 {
 741         db_expr_t old_radix, tout;
 742         int err, i;
 743
 744         old_radix = db_radix;
 745         db_radix = 10;
 746         err = db_expression(&tout);
 747         db_skip_to_eol();
 748         db_radix = old_radix;
 749
 750         /* If no argument is provided the watchdog will just be disabled. */
 751         if (err == 0) {
 752                 db_printf("No argument provided, disabling watchdog\n");
 753                 tout = 0;
 754         } else if ((tout & WD_INTERVAL) == WD_TO_NEVER) {
 755                 db_error("Out of range watchdog interval\n");
 756                 return;
 757         }
 758         EVENTHANDLER_INVOKE(watchdog_list, tout, &i);
 759 }
 760
 761 static void
 762 db_gdb(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
 763 {
 764
 765         if (kdb_dbbe_select("gdb") != 0) {
 766                 db_printf("The remote GDB backend could not be selected.\n");
 767                 return;
 768         }
 769         /*
 770          * Mark that we are done in the debugger.  kdb_trap()
 771          * should re-enter with the new backend.
 772          */
 773         db_cmd_loop_done = 1;
 774         db_printf("(ctrl-c will return control to ddb)\n");
 775 }
 776
 777 static void
 778 db_stack_trace(db_expr_t tid, boolean_t hastid, db_expr_t count, char *modif)
 779 {
 780         struct thread *td;
 781         db_expr_t radix;
 782         pid_t pid;
 783         int t;
 784
 785         /*
 786          * We parse our own arguments. We don't like the default radix.
 787          */
 788         radix = db_radix;
 789         db_radix = 10;
 790         hastid = db_expression(&tid);
 791         t = db_read_token();
 792         if (t == tCOMMA) {
 793                 if (!db_expression(&count)) {
 794                         db_printf("Count missing\n");
 795                         db_flush_lex();
 796                         return;
 797                 }
 798         } else {
 799                 db_unread_token(t);
 800                 count = -1;
 801         }
 802         db_skip_to_eol();
 803         db_radix = radix;
 804
 805         if (hastid) {
 806                 td = kdb_thr_lookup((lwpid_t)tid);
 807                 if (td == NULL)
 808                         td = kdb_thr_from_pid((pid_t)tid);
 809                 if (td == NULL) {
 810                         db_printf("Thread %d not found\n", (int)tid);
 811                         return;
 812                 }
 813         } else
 814                 td = kdb_thread;
 815         if (td->td_proc != NULL)
 816                 pid = td->td_proc->p_pid;
 817         else
 818                 pid = -1;
 819         db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td);
 820         db_trace_thread(td, count);
 821 }
 822
 823 static void
 824 db_stack_trace_all(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3,
 825     char *dummy4)
 826 {
 827         struct proc *p;
 828         struct thread *td;
 829         jmp_buf jb;
 830         void *prev_jb;
 831
 832         FOREACH_PROC_IN_SYSTEM(p) {
 833                 prev_jb = kdb_jmpbuf(jb);
 834                 if (setjmp(jb) == 0) {
 835                         FOREACH_THREAD_IN_PROC(p, td) {
 836                                 db_printf("\nTracing command %s pid %d tid %ld td %p\n",
 837                                           p->p_comm, p->p_pid, (long)td->td_tid, td);
 838                                 db_trace_thread(td, -1);
 839                                 if (db_pager_quit) {
 840                                         kdb_jmpbuf(prev_jb);
 841                                         return;
 842                                 }
 843                         }
 844                 }
 845                 kdb_jmpbuf(prev_jb);
 846         }
 847 }
 848
 849 /*
 850  * Take the parsed expression value from the command line that was parsed
 851  * as a hexadecimal value and convert it as if the expression was parsed
 852  * as a decimal value.  Returns -1 if the expression was not a valid
 853  * decimal value.
 854  */
 855 db_expr_t
 856 db_hex2dec(db_expr_t expr)
 857 {
 858         uintptr_t x, y;
 859         db_expr_t val;
 860
 861         y = 1;
 862         val = 0;
 863         x = expr;
 864         while (x != 0) {
 865                 if (x % 16 > 9)
 866                         return (-1);
 867                 val += (x % 16) * (y);
 868                 x >>= 4;
 869                 y *= 10;
 870         }
 871         return (val);
 872 }