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  * $FreeBSD$
   27  */
   28 
   29 /*
   30  *      Author: David B. Golub, Carnegie Mellon University
   31  *      Date:   7/90
   32  */
   33 
   34 /*
   35  * Command dispatcher.
   36  */
   37 #include <sys/param.h>
   38 #include <sys/linker_set.h>
   39 #include <sys/reboot.h>
   40 #include <sys/systm.h>
   41 
   42 #include <ddb/ddb.h>
   43 #include <ddb/db_command.h>
   44 #include <ddb/db_lex.h>
   45 #include <ddb/db_output.h>
   46 
   47 #include <setjmp.h>
   48 
   49 /*
   50  * Exported global variables
   51  */
   52 boolean_t       db_cmd_loop_done;
   53 extern struct linker_set        db_cmd_set;
   54 db_addr_t       db_dot;
   55 jmp_buf         db_jmpbuf;
   56 db_addr_t       db_last_addr;
   57 db_addr_t       db_prev;
   58 db_addr_t       db_next;
   59 extern struct linker_set        db_show_cmd_set;
   60 
   61 static db_cmdfcn_t      db_fncall;
   62 static db_cmdfcn_t      db_gdb;
   63 
   64 /* XXX this is actually forward-static. */
   65 extern struct command   db_show_cmds[];
   66 
   67 /*
   68  * if 'ed' style: 'dot' is set at start of last item printed,
   69  * and '+' points to next line.
   70  * Otherwise: 'dot' points to next item, '..' points to last.
   71  */
   72 static boolean_t        db_ed_style = TRUE;
   73 
   74 /*
   75  * Utility routine - discard tokens through end-of-line.
   76  */
   77 void
   78 db_skip_to_eol()
   79 {
   80         int     t;
   81         do {
   82             t = db_read_token();
   83         } while (t != tEOL);
   84 }
   85 
   86 /*
   87  * Results of command search.
   88  */
   89 #define CMD_UNIQUE      0
   90 #define CMD_FOUND       1
   91 #define CMD_NONE        2
   92 #define CMD_AMBIGUOUS   3
   93 #define CMD_HELP        4
   94 
   95 static void     db_cmd_list __P((struct command *table,
   96                                  struct command **aux_tablep));
   97 static int      db_cmd_search __P((char *name, struct command *table,
   98                                    struct command **aux_tablep,
   99                                    struct command **cmdp));
  100 static void     db_command __P((struct command **last_cmdp,
  101                                 struct command *cmd_table,
  102                                 struct command **aux_cmd_tablep));
  103 
  104 /*
  105  * Search for command prefix.
  106  */
  107 static int
  108 db_cmd_search(name, table, aux_tablep, cmdp)
  109         char *          name;
  110         struct command  *table;
  111         struct command  **aux_tablep;
  112         struct command  **cmdp; /* out */
  113 {
  114         struct command  *cmd;
  115         struct command  **aux_cmdp;
  116         int             result = CMD_NONE;
  117 
  118         for (cmd = table; cmd->name != 0; cmd++) {
  119             register char *lp;
  120             register char *rp;
  121             register int  c;
  122 
  123             lp = name;
  124             rp = cmd->name;
  125             while ((c = *lp) == *rp) {
  126                 if (c == 0) {
  127                     /* complete match */
  128                     *cmdp = cmd;
  129                     return (CMD_UNIQUE);
  130                 }
  131                 lp++;
  132                 rp++;
  133             }
  134             if (c == 0) {
  135                 /* end of name, not end of command -
  136                    partial match */
  137                 if (result == CMD_FOUND) {
  138                     result = CMD_AMBIGUOUS;
  139                     /* but keep looking for a full match -
  140                        this lets us match single letters */
  141                 }
  142                 else {
  143                     *cmdp = cmd;
  144                     result = CMD_FOUND;
  145                 }
  146             }
  147         }
  148         if (result == CMD_NONE && aux_tablep != 0)
  149             /* XXX repeat too much code. */
  150             for (aux_cmdp = aux_tablep; *aux_cmdp != 0; aux_cmdp++) {
  151                 register char *lp;
  152                 register char *rp;
  153                 register int  c;
  154 
  155                 lp = name;
  156                 rp = (*aux_cmdp)->name;
  157                 while ((c = *lp) == *rp) {
  158                     if (c == 0) {
  159                         /* complete match */
  160                         *cmdp = *aux_cmdp;
  161                         return (CMD_UNIQUE);
  162                     }
  163                     lp++;
  164                     rp++;
  165                 }
  166                 if (c == 0) {
  167                     /* end of name, not end of command -
  168                        partial match */
  169                     if (result == CMD_FOUND) {
  170                         result = CMD_AMBIGUOUS;
  171                         /* but keep looking for a full match -
  172                            this lets us match single letters */
  173                     }
  174                     else {
  175                         *cmdp = *aux_cmdp;
  176                         result = CMD_FOUND;
  177                     }
  178                 }
  179             }
  180         if (result == CMD_NONE) {
  181             /* check for 'help' */
  182                 if (name[0] == 'h' && name[1] == 'e'
  183                     && name[2] == 'l' && name[3] == 'p')
  184                         result = CMD_HELP;
  185         }
  186         return (result);
  187 }
  188 
  189 static void
  190 db_cmd_list(table, aux_tablep)
  191         struct command *table;
  192         struct command **aux_tablep;
  193 {
  194         register struct command *cmd;
  195         register struct command **aux_cmdp;
  196 
  197         for (cmd = table; cmd->name != 0; cmd++) {
  198             db_printf("%-12s", cmd->name);
  199             db_end_line();
  200         }
  201         if (aux_tablep == 0)
  202             return;
  203         for (aux_cmdp = aux_tablep; *aux_cmdp != 0; aux_cmdp++) {
  204             db_printf("%-12s", (*aux_cmdp)->name);
  205             db_end_line();
  206         }
  207 }
  208 
  209 static void
  210 db_command(last_cmdp, cmd_table, aux_cmd_tablep)
  211         struct command  **last_cmdp;    /* IN_OUT */
  212         struct command  *cmd_table;
  213         struct command  **aux_cmd_tablep;
  214 {
  215         struct command  *cmd;
  216         int             t;
  217         char            modif[TOK_STRING_SIZE];
  218         db_expr_t       addr, count;
  219         boolean_t       have_addr = FALSE;
  220         int             result;
  221 
  222         t = db_read_token();
  223         if (t == tEOL) {
  224             /* empty line repeats last command, at 'next' */
  225             cmd = *last_cmdp;
  226             addr = (db_expr_t)db_next;
  227             have_addr = FALSE;
  228             count = 1;
  229             modif[0] = '\0';
  230         }
  231         else if (t == tEXCL) {
  232             db_fncall((db_expr_t)0, (boolean_t)0, (db_expr_t)0, (char *)0);
  233             return;
  234         }
  235         else if (t != tIDENT) {
  236             db_printf("?\n");
  237             db_flush_lex();
  238             return;
  239         }
  240         else {
  241             /*
  242              * Search for command
  243              */
  244             while (cmd_table) {
  245                 result = db_cmd_search(db_tok_string,
  246                                        cmd_table,
  247                                        aux_cmd_tablep,
  248                                        &cmd);
  249                 switch (result) {
  250                     case CMD_NONE:
  251                         db_printf("No such command\n");
  252                         db_flush_lex();
  253                         return;
  254                     case CMD_AMBIGUOUS:
  255                         db_printf("Ambiguous\n");
  256                         db_flush_lex();
  257                         return;
  258                     case CMD_HELP:
  259                         db_cmd_list(cmd_table, aux_cmd_tablep);
  260                         db_flush_lex();
  261                         return;
  262                     default:
  263                         break;
  264                 }
  265                 if ((cmd_table = cmd->more) != 0) {
  266                     /* XXX usually no more aux's. */
  267                     aux_cmd_tablep = 0;
  268                     if (cmd_table == db_show_cmds)
  269                         aux_cmd_tablep =
  270                             (struct command **)&db_show_cmd_set.ls_items[0];
  271 
  272                     t = db_read_token();
  273                     if (t != tIDENT) {
  274                         db_cmd_list(cmd_table, aux_cmd_tablep);
  275                         db_flush_lex();
  276                         return;
  277                     }
  278                 }
  279             }
  280 
  281             if ((cmd->flag & CS_OWN) == 0) {
  282                 /*
  283                  * Standard syntax:
  284                  * command [/modifier] [addr] [,count]
  285                  */
  286                 t = db_read_token();
  287                 if (t == tSLASH) {
  288                     t = db_read_token();
  289                     if (t != tIDENT) {
  290                         db_printf("Bad modifier\n");
  291                         db_flush_lex();
  292                         return;
  293                     }
  294                     db_strcpy(modif, db_tok_string);
  295                 }
  296                 else {
  297                     db_unread_token(t);
  298                     modif[0] = '\0';
  299                 }
  300 
  301                 if (db_expression(&addr)) {
  302                     db_dot = (db_addr_t) addr;
  303                     db_last_addr = db_dot;
  304                     have_addr = TRUE;
  305                 }
  306                 else {
  307                     addr = (db_expr_t) db_dot;
  308                     have_addr = FALSE;
  309                 }
  310                 t = db_read_token();
  311                 if (t == tCOMMA) {
  312                     if (!db_expression(&count)) {
  313                         db_printf("Count missing\n");
  314                         db_flush_lex();
  315                         return;
  316                     }
  317                 }
  318                 else {
  319                     db_unread_token(t);
  320                     count = -1;
  321                 }
  322                 if ((cmd->flag & CS_MORE) == 0) {
  323                     db_skip_to_eol();
  324                 }
  325             }
  326         }
  327         *last_cmdp = cmd;
  328         if (cmd != 0) {
  329             /*
  330              * Execute the command.
  331              */
  332             (*cmd->fcn)(addr, have_addr, count, modif);
  333 
  334             if (cmd->flag & CS_SET_DOT) {
  335                 /*
  336                  * If command changes dot, set dot to
  337                  * previous address displayed (if 'ed' style).
  338                  */
  339                 if (db_ed_style) {
  340                     db_dot = db_prev;
  341                 }
  342                 else {
  343                     db_dot = db_next;
  344                 }
  345             }
  346             else {
  347                 /*
  348                  * If command does not change dot,
  349                  * set 'next' location to be the same.
  350                  */
  351                 db_next = db_dot;
  352             }
  353         }
  354 }
  355 
  356 /*
  357  * 'show' commands
  358  */
  359 
  360 static struct command db_show_all_cmds[] = {
  361 #if 0
  362         { "threads",    db_show_all_threads,    0,      0 },
  363 #endif
  364         { "procs",      db_ps,                  0,      0 },
  365         { (char *)0 }
  366 };
  367 
  368 static struct command db_show_cmds[] = {
  369         { "all",        0,                      0,      db_show_all_cmds },
  370         { "registers",  db_show_regs,           0,      0 },
  371         { "breaks",     db_listbreak_cmd,       0,      0 },
  372 #if 0
  373         { "thread",     db_show_one_thread,     0,      0 },
  374 #endif
  375 #if 0
  376         { "port",       ipc_port_print,         0,      0 },
  377 #endif
  378         { (char *)0, }
  379 };
  380 
  381 static struct command db_command_table[] = {
  382         { "print",      db_print_cmd,           0,      0 },
  383         { "p",          db_print_cmd,           0,      0 },
  384         { "examine",    db_examine_cmd,         CS_SET_DOT, 0 },
  385         { "x",          db_examine_cmd,         CS_SET_DOT, 0 },
  386         { "search",     db_search_cmd,          CS_OWN|CS_SET_DOT, 0 },
  387         { "set",        db_set_cmd,             CS_OWN, 0 },
  388         { "write",      db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
  389         { "w",          db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
  390         { "delete",     db_delete_cmd,          0,      0 },
  391         { "d",          db_delete_cmd,          0,      0 },
  392         { "break",      db_breakpoint_cmd,      0,      0 },
  393         { "dwatch",     db_deletewatch_cmd,     0,      0 },
  394         { "watch",      db_watchpoint_cmd,      CS_MORE,0 },
  395         { "step",       db_single_step_cmd,     0,      0 },
  396         { "s",          db_single_step_cmd,     0,      0 },
  397         { "continue",   db_continue_cmd,        0,      0 },
  398         { "c",          db_continue_cmd,        0,      0 },
  399         { "until",      db_trace_until_call_cmd,0,      0 },
  400         { "next",       db_trace_until_matching_cmd,0,  0 },
  401         { "match",      db_trace_until_matching_cmd,0,  0 },
  402         { "trace",      db_stack_trace_cmd,     0,      0 },
  403         { "call",       db_fncall,              CS_OWN, 0 },
  404         { "show",       0,                      0,      db_show_cmds },
  405         { "ps",         db_ps,                  0,      0 },
  406         { "gdb",        db_gdb,                 0,      0 },
  407         { (char *)0, }
  408 };
  409 
  410 static struct command   *db_last_command = 0;
  411 
  412 #if 0
  413 void
  414 db_help_cmd()
  415 {
  416         struct command *cmd = db_command_table;
  417 
  418         while (cmd->name != 0) {
  419             db_printf("%-12s", cmd->name);
  420             db_end_line();
  421             cmd++;
  422         }
  423 }
  424 #endif
  425 
  426 /*
  427  * At least one non-optional command must be implemented using
  428  * DB_COMMAND() so that db_cmd_set gets created.  Here is one.
  429  */
  430 DB_COMMAND(panic, db_panic)
  431 {
  432         panic("from debugger");
  433 }
  434 
  435 void
  436 db_command_loop()
  437 {
  438         /*
  439          * Initialize 'prev' and 'next' to dot.
  440          */
  441         db_prev = db_dot;
  442         db_next = db_dot;
  443 
  444         db_cmd_loop_done = 0;
  445         while (!db_cmd_loop_done) {
  446 
  447             (void) setjmp(db_jmpbuf);
  448             if (db_print_position() != 0)
  449                 db_printf("\n");
  450 
  451             db_printf("db> ");
  452             (void) db_read_line();
  453 
  454             db_command(&db_last_command, db_command_table,
  455                        (struct command **)&db_cmd_set.ls_items[0]);
  456         }
  457 }
  458 
  459 void
  460 db_error(s)
  461         char *s;
  462 {
  463         if (s)
  464             db_printf(s);
  465         db_flush_lex();
  466         longjmp(db_jmpbuf, 1);
  467 }
  468 
  469 
  470 /*
  471  * Call random function:
  472  * !expr(arg,arg,arg)
  473  */
  474 static void
  475 db_fncall(dummy1, dummy2, dummy3, dummy4)
  476         db_expr_t       dummy1;
  477         boolean_t       dummy2;
  478         db_expr_t       dummy3;
  479         char *          dummy4;
  480 {
  481         db_expr_t       fn_addr;
  482 #define MAXARGS         11      /* XXX only 10 are passed */
  483         db_expr_t       args[MAXARGS];
  484         int             nargs = 0;
  485         db_expr_t       retval;
  486         typedef db_expr_t fcn_10args_t __P((db_expr_t, db_expr_t, db_expr_t,
  487                                             db_expr_t, db_expr_t, db_expr_t,
  488                                             db_expr_t, db_expr_t, db_expr_t,
  489                                             db_expr_t));
  490         fcn_10args_t    *func;
  491         int             t;
  492 
  493         if (!db_expression(&fn_addr)) {
  494             db_printf("Bad function\n");
  495             db_flush_lex();
  496             return;
  497         }
  498         func = (fcn_10args_t *)fn_addr; /* XXX */
  499 
  500         t = db_read_token();
  501         if (t == tLPAREN) {
  502             if (db_expression(&args[0])) {
  503                 nargs++;
  504                 while ((t = db_read_token()) == tCOMMA) {
  505                     if (nargs == MAXARGS) {
  506                         db_printf("Too many arguments\n");
  507                         db_flush_lex();
  508                         return;
  509                     }
  510                     if (!db_expression(&args[nargs])) {
  511                         db_printf("Argument missing\n");
  512                         db_flush_lex();
  513                         return;
  514                     }
  515                     nargs++;
  516                 }
  517                 db_unread_token(t);
  518             }
  519             if (db_read_token() != tRPAREN) {
  520                 db_printf("?\n");
  521                 db_flush_lex();
  522                 return;
  523             }
  524         }
  525         db_skip_to_eol();
  526 
  527         while (nargs < MAXARGS) {
  528             args[nargs++] = 0;
  529         }
  530 
  531         retval = (*func)(args[0], args[1], args[2], args[3], args[4],
  532                          args[5], args[6], args[7], args[8], args[9] );
  533         db_printf("%#r\n", retval);
  534 }
  535 
  536 /* Enter GDB remote protocol debugger on the next trap. */
  537 
  538 static void
  539 db_gdb (dummy1, dummy2, dummy3, dummy4)
  540         db_expr_t       dummy1;
  541         boolean_t       dummy2;
  542         db_expr_t       dummy3;
  543         char *          dummy4;
  544 {
  545         boothowto ^= RB_GDB;
  546 
  547         db_printf("Next trap will enter %s\n",
  548                    boothowto & RB_GDB ? "GDB remote protocol mode"
  549                                       : "DDB debugger");
  550 }
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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_command.c

FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_command.c
