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