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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: head/sys/ddb/db_command.c 242424 2012-11-01 04:07:08Z alfred $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/linker_set.h>
   39 #include <sys/lock.h>
   40 #include <sys/kdb.h>
   41 #include <sys/mutex.h>
   42 #include <sys/proc.h>
   43 #include <sys/reboot.h>
   44 #include <sys/signalvar.h>
   45 #include <sys/systm.h>
   46 #include <sys/cons.h>
   47 #include <sys/conf.h>
   48 #include <sys/watchdog.h>
   49 #include <sys/kernel.h>
   50 
   51 #include <ddb/ddb.h>
   52 #include <ddb/db_command.h>
   53 #include <ddb/db_lex.h>
   54 #include <ddb/db_output.h>
   55 
   56 #include <machine/cpu.h>
   57 #include <machine/setjmp.h>
   58 
   59 /*
   60  * Exported global variables
   61  */
   62 boolean_t       db_cmd_loop_done;
   63 db_addr_t       db_dot;
   64 db_addr_t       db_last_addr;
   65 db_addr_t       db_prev;
   66 db_addr_t       db_next;
   67 
   68 static db_cmdfcn_t      db_dump;
   69 static db_cmdfcn_t      db_fncall;
   70 static db_cmdfcn_t      db_gdb;
   71 static db_cmdfcn_t      db_halt;
   72 static db_cmdfcn_t      db_kill;
   73 static db_cmdfcn_t      db_reset;
   74 static db_cmdfcn_t      db_stack_trace;
   75 static db_cmdfcn_t      db_stack_trace_all;
   76 static db_cmdfcn_t      db_watchdog;
   77 
   78 /*
   79  * 'show' commands
   80  */
   81 
   82 static struct command db_show_all_cmds[] = {
   83         { "trace",      db_stack_trace_all,     0,      0 },
   84 };
   85 struct command_table db_show_all_table =
   86     LIST_HEAD_INITIALIZER(db_show_all_table);
   87 
   88 static struct command db_show_cmds[] = {
   89         { "all",        0,                      0,      &db_show_all_table },
   90         { "registers",  db_show_regs,           0,      0 },
   91         { "breaks",     db_listbreak_cmd,       0,      0 },
   92         { "threads",    db_show_threads,        0,      0 },
   93 };
   94 struct command_table db_show_table = LIST_HEAD_INITIALIZER(db_show_table);
   95 
   96 static struct command db_cmds[] = {
   97         { "print",      db_print_cmd,           0,      0 },
   98         { "p",          db_print_cmd,           0,      0 },
   99         { "examine",    db_examine_cmd,         CS_SET_DOT, 0 },
  100         { "x",          db_examine_cmd,         CS_SET_DOT, 0 },
  101         { "search",     db_search_cmd,          CS_OWN|CS_SET_DOT, 0 },
  102         { "set",        db_set_cmd,             CS_OWN, 0 },
  103         { "write",      db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
  104         { "w",          db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
  105         { "delete",     db_delete_cmd,          0,      0 },
  106         { "d",          db_delete_cmd,          0,      0 },
  107         { "dump",       db_dump,                0,      0 },
  108         { "break",      db_breakpoint_cmd,      0,      0 },
  109         { "b",          db_breakpoint_cmd,      0,      0 },
  110         { "dwatch",     db_deletewatch_cmd,     0,      0 },
  111         { "watch",      db_watchpoint_cmd,      CS_MORE,0 },
  112         { "dhwatch",    db_deletehwatch_cmd,    0,      0 },
  113         { "hwatch",     db_hwatchpoint_cmd,     0,      0 },
  114         { "step",       db_single_step_cmd,     0,      0 },
  115         { "s",          db_single_step_cmd,     0,      0 },
  116         { "continue",   db_continue_cmd,        0,      0 },
  117         { "c",          db_continue_cmd,        0,      0 },
  118         { "until",      db_trace_until_call_cmd,0,      0 },
  119         { "next",       db_trace_until_matching_cmd,0,  0 },
  120         { "match",      db_trace_until_matching_cmd,0,  0 },
  121         { "trace",      db_stack_trace,         CS_OWN, 0 },
  122         { "t",          db_stack_trace,         CS_OWN, 0 },
  123         /* XXX alias for all trace */
  124         { "alltrace",   db_stack_trace_all,     0,      0 },
  125         { "where",      db_stack_trace,         CS_OWN, 0 },
  126         { "bt",         db_stack_trace,         CS_OWN, 0 },
  127         { "call",       db_fncall,              CS_OWN, 0 },
  128         { "show",       0,                      0,      &db_show_table },
  129         { "ps",         db_ps,                  0,      0 },
  130         { "gdb",        db_gdb,                 0,      0 },
  131         { "halt",       db_halt,                0,      0 },
  132         { "reboot",     db_reset,               0,      0 },
  133         { "reset",      db_reset,               0,      0 },
  134         { "kill",       db_kill,                CS_OWN, 0 },
  135         { "watchdog",   db_watchdog,            CS_OWN, 0 },
  136         { "thread",     db_set_thread,          CS_OWN, 0 },
  137         { "run",        db_run_cmd,             CS_OWN, 0 },
  138         { "script",     db_script_cmd,          CS_OWN, 0 },
  139         { "scripts",    db_scripts_cmd,         0,      0 },
  140         { "unscript",   db_unscript_cmd,        CS_OWN, 0 },
  141         { "capture",    db_capture_cmd,         CS_OWN, 0 },
  142         { "textdump",   db_textdump_cmd,        CS_OWN, 0 },
  143         { "findstack",  db_findstack_cmd,       0,      0 },
  144 };
  145 struct command_table db_cmd_table = LIST_HEAD_INITIALIZER(db_cmd_table);
  146 
  147 static struct command   *db_last_command = 0;
  148 
  149 /*
  150  * if 'ed' style: 'dot' is set at start of last item printed,
  151  * and '+' points to next line.
  152  * Otherwise: 'dot' points to next item, '..' points to last.
  153  */
  154 static boolean_t        db_ed_style = TRUE;
  155 
  156 /*
  157  * Utility routine - discard tokens through end-of-line.
  158  */
  159 void
  160 db_skip_to_eol()
  161 {
  162         int     t;
  163         do {
  164             t = db_read_token();
  165         } while (t != tEOL);
  166 }
  167 
  168 /*
  169  * Results of command search.
  170  */
  171 #define CMD_UNIQUE      0
  172 #define CMD_FOUND       1
  173 #define CMD_NONE        2
  174 #define CMD_AMBIGUOUS   3
  175 #define CMD_HELP        4
  176 
  177 static void     db_cmd_match(char *name, struct command *cmd,
  178                     struct command **cmdp, int *resultp);
  179 static void     db_cmd_list(struct command_table *table);
  180 static int      db_cmd_search(char *name, struct command_table *table,
  181                     struct command **cmdp);
  182 static void     db_command(struct command **last_cmdp,
  183                     struct command_table *cmd_table, int dopager);
  184 
  185 /*
  186  * Initialize the command lists from the static tables.
  187  */
  188 void
  189 db_command_init(void)
  190 {
  191 #define N(a)    (sizeof(a) / sizeof(a[0]))
  192         int i;
  193 
  194         for (i = 0; i < N(db_cmds); i++)
  195                 db_command_register(&db_cmd_table, &db_cmds[i]);
  196         for (i = 0; i < N(db_show_cmds); i++)
  197                 db_command_register(&db_show_table, &db_show_cmds[i]);
  198         for (i = 0; i < N(db_show_all_cmds); i++)
  199                 db_command_register(&db_show_all_table, &db_show_all_cmds[i]);
  200 #undef N
  201 }
  202 
  203 /*
  204  * Register a command.
  205  */
  206 void
  207 db_command_register(struct command_table *list, struct command *cmd)
  208 {
  209         struct command *c, *last;
  210 
  211         last = NULL;
  212         LIST_FOREACH(c, list, next) {
  213                 int n = strcmp(cmd->name, c->name);
  214 
  215                 /* Check that the command is not already present. */
  216                 if (n == 0) {
  217                         printf("%s: Warning, the command \"%s\" already exists;"
  218                              " ignoring request\n", __func__, cmd->name);
  219                         return;
  220                 }
  221                 if (n < 0) {
  222                         /* NB: keep list sorted lexicographically */
  223                         LIST_INSERT_BEFORE(c, cmd, next);
  224                         return;
  225                 }
  226                 last = c;
  227         }
  228         if (last == NULL)
  229                 LIST_INSERT_HEAD(list, cmd, next);
  230         else
  231                 LIST_INSERT_AFTER(last, cmd, next);
  232 }
  233 
  234 /*
  235  * Remove a command previously registered with db_command_register.
  236  */
  237 void
  238 db_command_unregister(struct command_table *list, struct command *cmd)
  239 {
  240         struct command *c;
  241 
  242         LIST_FOREACH(c, list, next) {
  243                 if (cmd == c) {
  244                         LIST_REMOVE(cmd, next);
  245                         return;
  246                 }
  247         }
  248         /* NB: intentionally quiet */
  249 }
  250 
  251 /*
  252  * Helper function to match a single command.
  253  */
  254 static void
  255 db_cmd_match(name, cmd, cmdp, resultp)
  256         char *          name;
  257         struct command  *cmd;
  258         struct command  **cmdp; /* out */
  259         int *           resultp;
  260 {
  261         char *lp, *rp;
  262         int c;
  263 
  264         lp = name;
  265         rp = cmd->name;
  266         while ((c = *lp) == *rp) {
  267                 if (c == 0) {
  268                         /* complete match */
  269                         *cmdp = cmd;
  270                         *resultp = CMD_UNIQUE;
  271                         return;
  272                 }
  273                 lp++;
  274                 rp++;
  275         }
  276         if (c == 0) {
  277                 /* end of name, not end of command -
  278                    partial match */
  279                 if (*resultp == CMD_FOUND) {
  280                         *resultp = CMD_AMBIGUOUS;
  281                         /* but keep looking for a full match -
  282                            this lets us match single letters */
  283                 } else {
  284                         *cmdp = cmd;
  285                         *resultp = CMD_FOUND;
  286                 }
  287         }
  288 }
  289 
  290 /*
  291  * Search for command prefix.
  292  */
  293 static int
  294 db_cmd_search(name, table, cmdp)
  295         char *          name;
  296         struct command_table *table;
  297         struct command  **cmdp; /* out */
  298 {
  299         struct command  *cmd;
  300         int             result = CMD_NONE;
  301 
  302         LIST_FOREACH(cmd, table, next) {
  303                 db_cmd_match(name,cmd,cmdp,&result);
  304                 if (result == CMD_UNIQUE)
  305                         break;
  306         }
  307 
  308         if (result == CMD_NONE) {
  309                 /* check for 'help' */
  310                 if (name[0] == 'h' && name[1] == 'e'
  311                     && name[2] == 'l' && name[3] == 'p')
  312                         result = CMD_HELP;
  313         }
  314         return (result);
  315 }
  316 
  317 static void
  318 db_cmd_list(table)
  319         struct command_table *table;
  320 {
  321         register struct command *cmd;
  322 
  323         LIST_FOREACH(cmd, table, next) {
  324                 db_printf("%-12s", cmd->name);
  325                 db_end_line(12);
  326         }
  327 }
  328 
  329 static void
  330 db_command(last_cmdp, cmd_table, dopager)
  331         struct command  **last_cmdp;    /* IN_OUT */
  332         struct command_table *cmd_table;
  333         int dopager;
  334 {
  335         struct command  *cmd = NULL;
  336         int             t;
  337         char            modif[TOK_STRING_SIZE];
  338         db_expr_t       addr, count;
  339         boolean_t       have_addr = FALSE;
  340         int             result;
  341 
  342         t = db_read_token();
  343         if (t == tEOL) {
  344             /* empty line repeats last command, at 'next' */
  345             cmd = *last_cmdp;
  346             addr = (db_expr_t)db_next;
  347             have_addr = FALSE;
  348             count = 1;
  349             modif[0] = '\0';
  350         }
  351         else if (t == tEXCL) {
  352             db_fncall((db_expr_t)0, (boolean_t)0, (db_expr_t)0, (char *)0);
  353             return;
  354         }
  355         else if (t != tIDENT) {
  356             db_printf("?\n");
  357             db_flush_lex();
  358             return;
  359         }
  360         else {
  361             /*
  362              * Search for command
  363              */
  364             while (cmd_table) {
  365                 result = db_cmd_search(db_tok_string,
  366                                        cmd_table,
  367                                        &cmd);
  368                 switch (result) {
  369                     case CMD_NONE:
  370                         db_printf("No such command\n");
  371                         db_flush_lex();
  372                         return;
  373                     case CMD_AMBIGUOUS:
  374                         db_printf("Ambiguous\n");
  375                         db_flush_lex();
  376                         return;
  377                     case CMD_HELP:
  378                         db_cmd_list(cmd_table);
  379                         db_flush_lex();
  380                         return;
  381                     default:
  382                         break;
  383                 }
  384                 if ((cmd_table = cmd->more) != NULL) {
  385                     t = db_read_token();
  386                     if (t != tIDENT) {
  387                         db_cmd_list(cmd_table);
  388                         db_flush_lex();
  389                         return;
  390                     }
  391                 }
  392             }
  393 
  394             if ((cmd->flag & CS_OWN) == 0) {
  395                 /*
  396                  * Standard syntax:
  397                  * command [/modifier] [addr] [,count]
  398                  */
  399                 t = db_read_token();
  400                 if (t == tSLASH) {
  401                     t = db_read_token();
  402                     if (t != tIDENT) {
  403                         db_printf("Bad modifier\n");
  404                         db_flush_lex();
  405                         return;
  406                     }
  407                     db_strcpy(modif, db_tok_string);
  408                 }
  409                 else {
  410                     db_unread_token(t);
  411                     modif[0] = '\0';
  412                 }
  413 
  414                 if (db_expression(&addr)) {
  415                     db_dot = (db_addr_t) addr;
  416                     db_last_addr = db_dot;
  417                     have_addr = TRUE;
  418                 }
  419                 else {
  420                     addr = (db_expr_t) db_dot;
  421                     have_addr = FALSE;
  422                 }
  423                 t = db_read_token();
  424                 if (t == tCOMMA) {
  425                     if (!db_expression(&count)) {
  426                         db_printf("Count missing\n");
  427                         db_flush_lex();
  428                         return;
  429                     }
  430                 }
  431                 else {
  432                     db_unread_token(t);
  433                     count = -1;
  434                 }
  435                 if ((cmd->flag & CS_MORE) == 0) {
  436                     db_skip_to_eol();
  437                 }
  438             }
  439         }
  440         *last_cmdp = cmd;
  441         if (cmd != 0) {
  442             /*
  443              * Execute the command.
  444              */
  445             if (dopager)
  446                 db_enable_pager();
  447             else
  448                 db_disable_pager();
  449             (*cmd->fcn)(addr, have_addr, count, modif);
  450             if (dopager)
  451                 db_disable_pager();
  452 
  453             if (cmd->flag & CS_SET_DOT) {
  454                 /*
  455                  * If command changes dot, set dot to
  456                  * previous address displayed (if 'ed' style).
  457                  */
  458                 if (db_ed_style) {
  459                     db_dot = db_prev;
  460                 }
  461                 else {
  462                     db_dot = db_next;
  463                 }
  464             }
  465             else {
  466                 /*
  467                  * If command does not change dot,
  468                  * set 'next' location to be the same.
  469                  */
  470                 db_next = db_dot;
  471             }
  472         }
  473 }
  474 
  475 /*
  476  * At least one non-optional command must be implemented using
  477  * DB_COMMAND() so that db_cmd_set gets created.  Here is one.
  478  */
  479 DB_COMMAND(panic, db_panic)
  480 {
  481         db_disable_pager();
  482         panic("from debugger");
  483 }
  484 
  485 void
  486 db_command_loop()
  487 {
  488         /*
  489          * Initialize 'prev' and 'next' to dot.
  490          */
  491         db_prev = db_dot;
  492         db_next = db_dot;
  493 
  494         db_cmd_loop_done = 0;
  495         while (!db_cmd_loop_done) {
  496             if (db_print_position() != 0)
  497                 db_printf("\n");
  498 
  499             db_printf("db> ");
  500             (void) db_read_line();
  501 
  502             db_command(&db_last_command, &db_cmd_table, /* dopager */ 1);
  503         }
  504 }
  505 
  506 /*
  507  * Execute a command on behalf of a script.  The caller is responsible for
  508  * making sure that the command string is < DB_MAXLINE or it will be
  509  * truncated.
  510  *
  511  * XXXRW: Runs by injecting faked input into DDB input stream; it would be
  512  * nicer to use an alternative approach that didn't mess with the previous
  513  * command buffer.
  514  */
  515 void
  516 db_command_script(const char *command)
  517 {
  518         db_prev = db_next = db_dot;
  519         db_inject_line(command);
  520         db_command(&db_last_command, &db_cmd_table, /* dopager */ 0);
  521 }
  522 
  523 void
  524 db_error(s)
  525         const char *s;
  526 {
  527         if (s)
  528             db_printf("%s", s);
  529         db_flush_lex();
  530         kdb_reenter();
  531 }
  532 
  533 static void
  534 db_dump(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
  535 {
  536         int error;
  537 
  538         if (textdump_pending) {
  539                 db_printf("textdump_pending set.\n"
  540                     "run \"textdump unset\" first or \"textdump dump\" for a textdump.\n");
  541                 return;
  542         }
  543         error = doadump(FALSE);
  544         if (error) {
  545                 db_printf("Cannot dump: ");
  546                 switch (error) {
  547                 case EBUSY:
  548                         db_printf("debugger got invoked while dumping.\n");
  549                         break;
  550                 case ENXIO:
  551                         db_printf("no dump device specified.\n");
  552                         break;
  553                 default:
  554                         db_printf("unknown error (error=%d).\n", error);
  555                         break;
  556                 }
  557         }
  558 }
  559 
  560 /*
  561  * Call random function:
  562  * !expr(arg,arg,arg)
  563  */
  564 
  565 /* The generic implementation supports a maximum of 10 arguments. */
  566 typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t,
  567     db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t);
  568 
  569 static __inline int
  570 db_fncall_generic(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[])
  571 {
  572         __db_f *f = (__db_f *)addr;
  573 
  574         if (nargs > 10) {
  575                 db_printf("Too many arguments (max 10)\n");
  576                 return (0);
  577         }
  578         *rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5],
  579             args[6], args[7], args[8], args[9]);
  580         return (1);
  581 }
  582 
  583 static void
  584 db_fncall(dummy1, dummy2, dummy3, dummy4)
  585         db_expr_t       dummy1;
  586         boolean_t       dummy2;
  587         db_expr_t       dummy3;
  588         char *          dummy4;
  589 {
  590         db_expr_t       fn_addr;
  591         db_expr_t       args[DB_MAXARGS];
  592         int             nargs = 0;
  593         db_expr_t       retval;
  594         int             t;
  595 
  596         if (!db_expression(&fn_addr)) {
  597             db_printf("Bad function\n");
  598             db_flush_lex();
  599             return;
  600         }
  601 
  602         t = db_read_token();
  603         if (t == tLPAREN) {
  604             if (db_expression(&args[0])) {
  605                 nargs++;
  606                 while ((t = db_read_token()) == tCOMMA) {
  607                     if (nargs == DB_MAXARGS) {
  608                         db_printf("Too many arguments (max %d)\n", DB_MAXARGS);
  609                         db_flush_lex();
  610                         return;
  611                     }
  612                     if (!db_expression(&args[nargs])) {
  613                         db_printf("Argument missing\n");
  614                         db_flush_lex();
  615                         return;
  616                     }
  617                     nargs++;
  618                 }
  619                 db_unread_token(t);
  620             }
  621             if (db_read_token() != tRPAREN) {
  622                 db_printf("?\n");
  623                 db_flush_lex();
  624                 return;
  625             }
  626         }
  627         db_skip_to_eol();
  628         db_disable_pager();
  629 
  630         if (DB_CALL(fn_addr, &retval, nargs, args))
  631                 db_printf("= %#lr\n", (long)retval);
  632 }
  633 
  634 static void
  635 db_halt(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
  636 {
  637 
  638         cpu_halt();
  639 }
  640 
  641 static void
  642 db_kill(dummy1, dummy2, dummy3, dummy4)
  643         db_expr_t       dummy1;
  644         boolean_t       dummy2;
  645         db_expr_t       dummy3;
  646         char *          dummy4;
  647 {
  648         db_expr_t old_radix, pid, sig;
  649         struct proc *p;
  650 
  651 #define DB_ERROR(f)     do { db_printf f; db_flush_lex(); goto out; } while (0)
  652 
  653         /*
  654          * PIDs and signal numbers are typically represented in base
  655          * 10, so make that the default here.  It can, of course, be
  656          * overridden by specifying a prefix.
  657          */
  658         old_radix = db_radix;
  659         db_radix = 10;
  660         /* Retrieve arguments. */
  661         if (!db_expression(&sig))
  662                 DB_ERROR(("Missing signal number\n"));
  663         if (!db_expression(&pid))
  664                 DB_ERROR(("Missing process ID\n"));
  665         db_skip_to_eol();
  666         if (!_SIG_VALID(sig))
  667                 DB_ERROR(("Signal number out of range\n"));
  668 
  669         /*
  670          * Find the process in question.  allproc_lock is not needed
  671          * since we're in DDB.
  672          */
  673         /* sx_slock(&allproc_lock); */
  674         FOREACH_PROC_IN_SYSTEM(p)
  675             if (p->p_pid == pid)
  676                     break;
  677         /* sx_sunlock(&allproc_lock); */
  678         if (p == NULL)
  679                 DB_ERROR(("Can't find process with pid %ld\n", (long) pid));
  680 
  681         /* If it's already locked, bail; otherwise, do the deed. */
  682         if (PROC_TRYLOCK(p) == 0)
  683                 DB_ERROR(("Can't lock process with pid %ld\n", (long) pid));
  684         else {
  685                 pksignal(p, sig, NULL);
  686                 PROC_UNLOCK(p);
  687         }
  688 
  689 out:
  690         db_radix = old_radix;
  691 #undef DB_ERROR
  692 }
  693 
  694 /*
  695  * Reboot.  In case there is an additional argument, take it as delay in
  696  * seconds.  Default to 15s if we cannot parse it and make sure we will
  697  * never wait longer than 1 week.  Some code is similar to
  698  * kern_shutdown.c:shutdown_panic().
  699  */
  700 #ifndef DB_RESET_MAXDELAY
  701 #define DB_RESET_MAXDELAY       (3600 * 24 * 7)
  702 #endif
  703 
  704 static void
  705 db_reset(db_expr_t addr, boolean_t have_addr, db_expr_t count __unused,
  706     char *modif __unused)
  707 {
  708         int delay, loop;
  709 
  710         if (have_addr) {
  711                 delay = (int)db_hex2dec(addr);
  712 
  713                 /* If we parse to fail, use 15s. */
  714                 if (delay == -1)
  715                         delay = 15;
  716 
  717                 /* Cap at one week. */
  718                 if ((uintmax_t)delay > (uintmax_t)DB_RESET_MAXDELAY)
  719                         delay = DB_RESET_MAXDELAY;
  720 
  721                 db_printf("Automatic reboot in %d seconds - "
  722                     "press a key on the console to abort\n", delay);
  723                 for (loop = delay * 10; loop > 0; --loop) {
  724                         DELAY(1000 * 100); /* 1/10th second */
  725                         /* Did user type a key? */
  726                         if (cncheckc() != -1)
  727                                 return;
  728                 }
  729         }
  730 
  731         cpu_reset();
  732 }
  733 
  734 static void
  735 db_watchdog(dummy1, dummy2, dummy3, dummy4)
  736         db_expr_t       dummy1;
  737         boolean_t       dummy2;
  738         db_expr_t       dummy3;
  739         char *          dummy4;
  740 {
  741         db_expr_t old_radix, tout;
  742         int err, i;
  743 
  744         old_radix = db_radix;
  745         db_radix = 10;
  746         err = db_expression(&tout);
  747         db_skip_to_eol();
  748         db_radix = old_radix;
  749 
  750         /* If no argument is provided the watchdog will just be disabled. */
  751         if (err == 0) {
  752                 db_printf("No argument provided, disabling watchdog\n");
  753                 tout = 0;
  754         } else if ((tout & WD_INTERVAL) == WD_TO_NEVER) {
  755                 db_error("Out of range watchdog interval\n");
  756                 return;
  757         }
  758         EVENTHANDLER_INVOKE(watchdog_list, tout, &i);
  759 }
  760 
  761 static void
  762 db_gdb(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
  763 {
  764 
  765         if (kdb_dbbe_select("gdb") != 0) {
  766                 db_printf("The remote GDB backend could not be selected.\n");
  767                 return;
  768         }
  769         /*
  770          * Mark that we are done in the debugger.  kdb_trap()
  771          * should re-enter with the new backend.
  772          */
  773         db_cmd_loop_done = 1;
  774         db_printf("(ctrl-c will return control to ddb)\n");
  775 }
  776 
  777 static void
  778 db_stack_trace(db_expr_t tid, boolean_t hastid, db_expr_t count, char *modif)
  779 {
  780         struct thread *td;
  781         db_expr_t radix;
  782         pid_t pid;
  783         int t;
  784 
  785         /*
  786          * We parse our own arguments. We don't like the default radix.
  787          */
  788         radix = db_radix;
  789         db_radix = 10;
  790         hastid = db_expression(&tid);
  791         t = db_read_token();
  792         if (t == tCOMMA) {
  793                 if (!db_expression(&count)) {
  794                         db_printf("Count missing\n");
  795                         db_flush_lex();
  796                         return;
  797                 }
  798         } else {
  799                 db_unread_token(t);
  800                 count = -1;
  801         }
  802         db_skip_to_eol();
  803         db_radix = radix;
  804 
  805         if (hastid) {
  806                 td = kdb_thr_lookup((lwpid_t)tid);
  807                 if (td == NULL)
  808                         td = kdb_thr_from_pid((pid_t)tid);
  809                 if (td == NULL) {
  810                         db_printf("Thread %d not found\n", (int)tid);
  811                         return;
  812                 }
  813         } else
  814                 td = kdb_thread;
  815         if (td->td_proc != NULL)
  816                 pid = td->td_proc->p_pid;
  817         else
  818                 pid = -1;
  819         db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td);
  820         db_trace_thread(td, count);
  821 }
  822 
  823 static void
  824 db_stack_trace_all(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3,
  825     char *dummy4)
  826 {
  827         struct proc *p;
  828         struct thread *td;
  829         jmp_buf jb;
  830         void *prev_jb;
  831 
  832         FOREACH_PROC_IN_SYSTEM(p) {
  833                 prev_jb = kdb_jmpbuf(jb);
  834                 if (setjmp(jb) == 0) {
  835                         FOREACH_THREAD_IN_PROC(p, td) {
  836                                 db_printf("\nTracing command %s pid %d tid %ld td %p\n",
  837                                           p->p_comm, p->p_pid, (long)td->td_tid, td);
  838                                 db_trace_thread(td, -1);
  839                                 if (db_pager_quit) {
  840                                         kdb_jmpbuf(prev_jb);
  841                                         return;
  842                                 }
  843                         }
  844                 }
  845                 kdb_jmpbuf(prev_jb);
  846         }
  847 }
  848 
  849 /*
  850  * Take the parsed expression value from the command line that was parsed
  851  * as a hexadecimal value and convert it as if the expression was parsed
  852  * as a decimal value.  Returns -1 if the expression was not a valid
  853  * decimal value.
  854  */
  855 db_expr_t
  856 db_hex2dec(db_expr_t expr)
  857 {
  858         uintptr_t x, y;
  859         db_expr_t val;
  860 
  861         y = 1;
  862         val = 0;
  863         x = expr;
  864         while (x != 0) {
  865                 if (x % 16 > 9)
  866                         return (-1);
  867                 val += (x % 16) * (y);
  868                 x >>= 4;
  869                 y *= 10;
  870         }
  871         return (val);
  872 }

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