The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_command.c

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    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: releng/11.1/sys/ddb/db_command.c 298073 2016-04-15 17:27:20Z pfg $");
   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 bool            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,      NULL },
   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,      NULL },
   91         { "breaks",     db_listbreak_cmd,       0,      NULL },
   92         { "threads",    db_show_threads,        0,      NULL },
   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,      NULL },
   98         { "p",          db_print_cmd,           0,      NULL },
   99         { "examine",    db_examine_cmd,         CS_SET_DOT, NULL },
  100         { "x",          db_examine_cmd,         CS_SET_DOT, NULL },
  101         { "search",     db_search_cmd,          CS_OWN|CS_SET_DOT, NULL },
  102         { "set",        db_set_cmd,             CS_OWN, NULL },
  103         { "write",      db_write_cmd,           CS_MORE|CS_SET_DOT, NULL },
  104         { "w",          db_write_cmd,           CS_MORE|CS_SET_DOT, NULL },
  105         { "delete",     db_delete_cmd,          0,      NULL },
  106         { "d",          db_delete_cmd,          0,      NULL },
  107         { "dump",       db_dump,                0,      NULL },
  108         { "break",      db_breakpoint_cmd,      0,      NULL },
  109         { "b",          db_breakpoint_cmd,      0,      NULL },
  110         { "dwatch",     db_deletewatch_cmd,     0,      NULL },
  111         { "watch",      db_watchpoint_cmd,      CS_MORE,NULL },
  112         { "dhwatch",    db_deletehwatch_cmd,    0,      NULL },
  113         { "hwatch",     db_hwatchpoint_cmd,     0,      NULL },
  114         { "step",       db_single_step_cmd,     0,      NULL },
  115         { "s",          db_single_step_cmd,     0,      NULL },
  116         { "continue",   db_continue_cmd,        0,      NULL },
  117         { "c",          db_continue_cmd,        0,      NULL },
  118         { "until",      db_trace_until_call_cmd,0,      NULL },
  119         { "next",       db_trace_until_matching_cmd,0,  NULL },
  120         { "match",      db_trace_until_matching_cmd,0,  NULL },
  121         { "trace",      db_stack_trace,         CS_OWN, NULL },
  122         { "t",          db_stack_trace,         CS_OWN, NULL },
  123         /* XXX alias for all trace */
  124         { "alltrace",   db_stack_trace_all,     0,      NULL },
  125         { "where",      db_stack_trace,         CS_OWN, NULL },
  126         { "bt",         db_stack_trace,         CS_OWN, NULL },
  127         { "call",       db_fncall,              CS_OWN, NULL },
  128         { "show",       0,                      0,      &db_show_table },
  129         { "ps",         db_ps,                  0,      NULL },
  130         { "gdb",        db_gdb,                 0,      NULL },
  131         { "halt",       db_halt,                0,      NULL },
  132         { "reboot",     db_reset,               0,      NULL },
  133         { "reset",      db_reset,               0,      NULL },
  134         { "kill",       db_kill,                CS_OWN, NULL },
  135         { "watchdog",   db_watchdog,            CS_OWN, NULL },
  136         { "thread",     db_set_thread,          CS_OWN, NULL },
  137         { "run",        db_run_cmd,             CS_OWN, NULL },
  138         { "script",     db_script_cmd,          CS_OWN, NULL },
  139         { "scripts",    db_scripts_cmd,         0,      NULL },
  140         { "unscript",   db_unscript_cmd,        CS_OWN, NULL },
  141         { "capture",    db_capture_cmd,         CS_OWN, NULL },
  142         { "textdump",   db_textdump_cmd,        CS_OWN, NULL },
  143         { "findstack",  db_findstack_cmd,       0,      NULL },
  144 };
  145 struct command_table db_cmd_table = LIST_HEAD_INITIALIZER(db_cmd_table);
  146 
  147 static struct command   *db_last_command = NULL;
  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 bool     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         struct command  *cmd;
  315 
  316         LIST_FOREACH(cmd, table, next) {
  317                 db_printf("%-16s", cmd->name);
  318                 db_end_line(16);
  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         bool            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, (bool)false, (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 != NULL) {
  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, bool 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, bool 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, bool dummy2, db_expr_t dummy3, char *dummy4)
  622 {
  623 
  624         cpu_halt();
  625 }
  626 
  627 static void
  628 db_kill(db_expr_t dummy1, bool 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, bool 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, bool 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, bool 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, bool 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, bool 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 }

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