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