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         error = doadump(FALSE);
 539         if (error) {
 540                 db_printf("Cannot dump: ");
 541                 switch (error) {
 542                 case EBUSY:
 543                         db_printf("debugger got invoked while dumping.\n");
 544                         break;
 545                 case ENXIO:
 546                         db_printf("no dump device specified.\n");
 547                         break;
 548                 default:
 549                         db_printf("unknown error (error=%d).\n", error);
 550                         break;
 551                 }
 552         }
 553 }
 554
 555 /*
 556  * Call random function:
 557  * !expr(arg,arg,arg)
 558  */
 559
 560 /* The generic implementation supports a maximum of 10 arguments. */
 561 typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t,
 562     db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t);
 563
 564 static __inline int
 565 db_fncall_generic(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[])
 566 {
 567         __db_f *f = (__db_f *)addr;
 568
 569         if (nargs > 10) {
 570                 db_printf("Too many arguments (max 10)\n");
 571                 return (0);
 572         }
 573         *rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5],
 574             args[6], args[7], args[8], args[9]);
 575         return (1);
 576 }
 577
 578 static void
 579 db_fncall(dummy1, dummy2, dummy3, dummy4)
 580         db_expr_t       dummy1;
 581         boolean_t       dummy2;
 582         db_expr_t       dummy3;
 583         char *          dummy4;
 584 {
 585         db_expr_t       fn_addr;
 586         db_expr_t       args[DB_MAXARGS];
 587         int             nargs = 0;
 588         db_expr_t       retval;
 589         int             t;
 590
 591         if (!db_expression(&fn_addr)) {
 592             db_printf("Bad function\n");
 593             db_flush_lex();
 594             return;
 595         }
 596
 597         t = db_read_token();
 598         if (t == tLPAREN) {
 599             if (db_expression(&args[0])) {
 600                 nargs++;
 601                 while ((t = db_read_token()) == tCOMMA) {
 602                     if (nargs == DB_MAXARGS) {
 603                         db_printf("Too many arguments (max %d)\n", DB_MAXARGS);
 604                         db_flush_lex();
 605                         return;
 606                     }
 607                     if (!db_expression(&args[nargs])) {
 608                         db_printf("Argument missing\n");
 609                         db_flush_lex();
 610                         return;
 611                     }
 612                     nargs++;
 613                 }
 614                 db_unread_token(t);
 615             }
 616             if (db_read_token() != tRPAREN) {
 617                 db_printf("?\n");
 618                 db_flush_lex();
 619                 return;
 620             }
 621         }
 622         db_skip_to_eol();
 623         db_disable_pager();
 624
 625         if (DB_CALL(fn_addr, &retval, nargs, args))
 626                 db_printf("= %#lr\n", (long)retval);
 627 }
 628
 629 static void
 630 db_halt(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
 631 {
 632
 633         cpu_halt();
 634 }
 635
 636 static void
 637 db_kill(dummy1, dummy2, dummy3, dummy4)
 638         db_expr_t       dummy1;
 639         boolean_t       dummy2;
 640         db_expr_t       dummy3;
 641         char *          dummy4;
 642 {
 643         db_expr_t old_radix, pid, sig;
 644         struct proc *p;
 645
 646 #define DB_ERROR(f)     do { db_printf f; db_flush_lex(); goto out; } while (0)
 647
 648         /*
 649          * PIDs and signal numbers are typically represented in base
 650          * 10, so make that the default here.  It can, of course, be
 651          * overridden by specifying a prefix.
 652          */
 653         old_radix = db_radix;
 654         db_radix = 10;
 655         /* Retrieve arguments. */
 656         if (!db_expression(&sig))
 657                 DB_ERROR(("Missing signal number\n"));
 658         if (!db_expression(&pid))
 659                 DB_ERROR(("Missing process ID\n"));
 660         db_skip_to_eol();
 661         if (!_SIG_VALID(sig))
 662                 DB_ERROR(("Signal number out of range\n"));
 663
 664         /*
 665          * Find the process in question.  allproc_lock is not needed
 666          * since we're in DDB.
 667          */
 668         /* sx_slock(&allproc_lock); */
 669         FOREACH_PROC_IN_SYSTEM(p)
 670             if (p->p_pid == pid)
 671                     break;
 672         /* sx_sunlock(&allproc_lock); */
 673         if (p == NULL)
 674                 DB_ERROR(("Can't find process with pid %ld\n", (long) pid));
 675
 676         /* If it's already locked, bail; otherwise, do the deed. */
 677         if (PROC_TRYLOCK(p) == 0)
 678                 DB_ERROR(("Can't lock process with pid %ld\n", (long) pid));
 679         else {
 680                 pksignal(p, sig, NULL);
 681                 PROC_UNLOCK(p);
 682         }
 683
 684 out:
 685         db_radix = old_radix;
 686 #undef DB_ERROR
 687 }
 688
 689 /*
 690  * Reboot.  In case there is an additional argument, take it as delay in
 691  * seconds.  Default to 15s if we cannot parse it and make sure we will
 692  * never wait longer than 1 week.  Some code is similar to
 693  * kern_shutdown.c:shutdown_panic().
 694  */
 695 #ifndef DB_RESET_MAXDELAY
 696 #define DB_RESET_MAXDELAY       (3600 * 24 * 7)
 697 #endif
 698
 699 static void
 700 db_reset(db_expr_t addr, boolean_t have_addr, db_expr_t count __unused,
 701     char *modif __unused)
 702 {
 703         int delay, loop;
 704
 705         if (have_addr) {
 706                 delay = (int)db_hex2dec(addr);
 707
 708                 /* If we parse to fail, use 15s. */
 709                 if (delay == -1)
 710                         delay = 15;
 711
 712                 /* Cap at one week. */
 713                 if ((uintmax_t)delay > (uintmax_t)DB_RESET_MAXDELAY)
 714                         delay = DB_RESET_MAXDELAY;
 715
 716                 db_printf("Automatic reboot in %d seconds - "
 717                     "press a key on the console to abort\n", delay);
 718                 for (loop = delay * 10; loop > 0; --loop) {
 719                         DELAY(1000 * 100); /* 1/10th second */
 720                         /* Did user type a key? */
 721                         if (cncheckc() != -1)
 722                                 return;
 723                 }
 724         }
 725
 726         cpu_reset();
 727 }
 728
 729 static void
 730 db_watchdog(dummy1, dummy2, dummy3, dummy4)
 731         db_expr_t       dummy1;
 732         boolean_t       dummy2;
 733         db_expr_t       dummy3;
 734         char *          dummy4;
 735 {
 736         db_expr_t old_radix, tout;
 737         int err, i;
 738
 739         old_radix = db_radix;
 740         db_radix = 10;
 741         err = db_expression(&tout);
 742         db_skip_to_eol();
 743         db_radix = old_radix;
 744
 745         /* If no argument is provided the watchdog will just be disabled. */
 746         if (err == 0) {
 747                 db_printf("No argument provided, disabling watchdog\n");
 748                 tout = 0;
 749         } else if ((tout & WD_INTERVAL) == WD_TO_NEVER) {
 750                 db_error("Out of range watchdog interval\n");
 751                 return;
 752         }
 753         EVENTHANDLER_INVOKE(watchdog_list, tout, &i);
 754 }
 755
 756 static void
 757 db_gdb(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
 758 {
 759
 760         if (kdb_dbbe_select("gdb") != 0) {
 761                 db_printf("The remote GDB backend could not be selected.\n");
 762                 return;
 763         }
 764         /*
 765          * Mark that we are done in the debugger.  kdb_trap()
 766          * should re-enter with the new backend.
 767          */
 768         db_cmd_loop_done = 1;
 769         db_printf("(ctrl-c will return control to ddb)\n");
 770 }
 771
 772 static void
 773 db_stack_trace(db_expr_t tid, boolean_t hastid, db_expr_t count, char *modif)
 774 {
 775         struct thread *td;
 776         db_expr_t radix;
 777         pid_t pid;
 778         int t;
 779
 780         /*
 781          * We parse our own arguments. We don't like the default radix.
 782          */
 783         radix = db_radix;
 784         db_radix = 10;
 785         hastid = db_expression(&tid);
 786         t = db_read_token();
 787         if (t == tCOMMA) {
 788                 if (!db_expression(&count)) {
 789                         db_printf("Count missing\n");
 790                         db_flush_lex();
 791                         return;
 792                 }
 793         } else {
 794                 db_unread_token(t);
 795                 count = -1;
 796         }
 797         db_skip_to_eol();
 798         db_radix = radix;
 799
 800         if (hastid) {
 801                 td = kdb_thr_lookup((lwpid_t)tid);
 802                 if (td == NULL)
 803                         td = kdb_thr_from_pid((pid_t)tid);
 804                 if (td == NULL) {
 805                         db_printf("Thread %d not found\n", (int)tid);
 806                         return;
 807                 }
 808         } else
 809                 td = kdb_thread;
 810         if (td->td_proc != NULL)
 811                 pid = td->td_proc->p_pid;
 812         else
 813                 pid = -1;
 814         db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td);
 815         db_trace_thread(td, count);
 816 }
 817
 818 static void
 819 db_stack_trace_all(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3,
 820     char *dummy4)
 821 {
 822         struct proc *p;
 823         struct thread *td;
 824         jmp_buf jb;
 825         void *prev_jb;
 826
 827         FOREACH_PROC_IN_SYSTEM(p) {
 828                 prev_jb = kdb_jmpbuf(jb);
 829                 if (setjmp(jb) == 0) {
 830                         FOREACH_THREAD_IN_PROC(p, td) {
 831                                 db_printf("\nTracing command %s pid %d tid %ld td %p\n",
 832                                           p->p_comm, p->p_pid, (long)td->td_tid, td);
 833                                 db_trace_thread(td, -1);
 834                                 if (db_pager_quit) {
 835                                         kdb_jmpbuf(prev_jb);
 836                                         return;
 837                                 }
 838                         }
 839                 }
 840                 kdb_jmpbuf(prev_jb);
 841         }
 842 }
 843
 844 /*
 845  * Take the parsed expression value from the command line that was parsed
 846  * as a hexadecimal value and convert it as if the expression was parsed
 847  * as a decimal value.  Returns -1 if the expression was not a valid
 848  * decimal value.
 849  */
 850 db_expr_t
 851 db_hex2dec(db_expr_t expr)
 852 {
 853         uintptr_t x, y;
 854         db_expr_t val;
 855
 856         y = 1;
 857         val = 0;
 858         x = expr;
 859         while (x != 0) {
 860                 if (x % 16 > 9)
 861                         return (-1);
 862                 val += (x % 16) * (y);
 863                 x >>= 4;
 864                 y *= 10;
 865         }
 866         return (val);
 867 }