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  * $FreeBSD: src/sys/ddb/db_command.c,v 1.34.2.2 2001/07/29 22:48:36 kris Exp $
  27  * $DragonFly: src/sys/ddb/db_command.c,v 1.12 2007/05/07 05:21:38 dillon Exp $
  28  */
  29
  30 /*
  31  *      Author: David B. Golub, Carnegie Mellon University
  32  *      Date:   7/90
  33  */
  34
  35 /*
  36  * Command dispatcher.
  37  */
  38 #include <sys/param.h>
  39 #include <sys/linker_set.h>
  40 #include <sys/reboot.h>
  41 #include <sys/systm.h>
  42 #include <sys/cons.h>
  43
  44 #include <ddb/ddb.h>
  45 #include <ddb/db_command.h>
  46 #include <ddb/db_lex.h>
  47 #include <ddb/db_output.h>
  48
  49 #include <machine/md_var.h>     /* needed for db_reset() */
  50
  51 #include <setjmp.h>
  52
  53 /*
  54  * Exported global variables
  55  */
  56 boolean_t       db_cmd_loop_done;
  57 db_addr_t       db_dot;
  58 jmp_buf         db_jmpbuf;
  59 db_addr_t       db_last_addr;
  60 db_addr_t       db_prev;
  61 db_addr_t       db_next;
  62
  63 SET_DECLARE(db_cmd_set, struct command);
  64 SET_DECLARE(db_show_cmd_set, struct command);
  65
  66 static db_cmdfcn_t      db_fncall;
  67 static db_cmdfcn_t      db_gdb;
  68 static db_cmdfcn_t      db_reset;
  69
  70 static struct command   db_show_cmds[];
  71
  72 /*
  73  * if 'ed' style: 'dot' is set at start of last item printed,
  74  * and '+' points to next line.
  75  * Otherwise: 'dot' points to next item, '..' points to last.
  76  */
  77 static boolean_t        db_ed_style = TRUE;
  78
  79 /*
  80  * Utility routine - discard tokens through end-of-line.
  81  */
  82 void
  83 db_skip_to_eol(void)
  84 {
  85         int     t;
  86         do {
  87             t = db_read_token();
  88         } while (t != tEOL);
  89 }
  90
  91 /*
  92  * Results of command search.
  93  */
  94 #define CMD_UNIQUE      0
  95 #define CMD_FOUND       1
  96 #define CMD_NONE        2
  97 #define CMD_AMBIGUOUS   3
  98 #define CMD_HELP        4
  99
 100 static void     db_cmd_list (struct command *table,
 101                                  struct command **aux_tablep,
 102                                  struct command **aux_tablep_end);
 103 static int      db_cmd_search (char *name, struct command *table,
 104                                    struct command **aux_tablep,
 105                                    struct command **aux_tablep_end,
 106                                    struct command **cmdp);
 107 static void     db_command (struct command **last_cmdp,
 108                                 struct command *cmd_table,
 109                                 struct command **aux_cmd_tablep,
 110                                 struct command **aux_cmd_tablep_end);
 111
 112 /*
 113  * Search for command prefix.
 114  *
 115  * Parameters:
 116  *     cmdp:    out
 117  */
 118 static int
 119 db_cmd_search(char *name, struct command *table, struct command **aux_tablep,
 120               struct command **aux_tablep_end, struct command **cmdp)
 121 {
 122         struct command  *cmd;
 123         struct command  **aux_cmdp;
 124         int             result = CMD_NONE;
 125
 126         for (cmd = table; cmd->name != 0; cmd++) {
 127             char *lp;
 128             char *rp;
 129             int  c;
 130
 131             lp = name;
 132             rp = cmd->name;
 133             while ((c = *lp) == *rp) {
 134                 if (c == 0) {
 135                     /* complete match */
 136                     *cmdp = cmd;
 137                     return (CMD_UNIQUE);
 138                 }
 139                 lp++;
 140                 rp++;
 141             }
 142             if (c == 0) {
 143                 /* end of name, not end of command -
 144                    partial match */
 145                 if (result == CMD_FOUND) {
 146                     result = CMD_AMBIGUOUS;
 147                     /* but keep looking for a full match -
 148                        this lets us match single letters */
 149                 }
 150                 else {
 151                     *cmdp = cmd;
 152                     result = CMD_FOUND;
 153                 }
 154             }
 155         }
 156         if (result == CMD_NONE && aux_tablep != 0)
 157             /* XXX repeat too much code. */
 158             for (aux_cmdp = aux_tablep; aux_cmdp < aux_tablep_end; aux_cmdp++) {
 159                 char *lp;
 160                 char *rp;
 161                 int  c;
 162
 163                 lp = name;
 164                 rp = (*aux_cmdp)->name;
 165                 while ((c = *lp) == *rp) {
 166                     if (c == 0) {
 167                         /* complete match */
 168                         *cmdp = *aux_cmdp;
 169                         return (CMD_UNIQUE);
 170                     }
 171                     lp++;
 172                     rp++;
 173                 }
 174                 if (c == 0) {
 175                     /* end of name, not end of command -
 176                        partial match */
 177                     if (result == CMD_FOUND) {
 178                         result = CMD_AMBIGUOUS;
 179                         /* but keep looking for a full match -
 180                            this lets us match single letters */
 181                     }
 182                     else {
 183                         *cmdp = *aux_cmdp;
 184                         result = CMD_FOUND;
 185                     }
 186                 }
 187             }
 188         if (result == CMD_NONE) {
 189             /* check for 'help' */
 190                 if (name[0] == 'h' && name[1] == 'e'
 191                     && name[2] == 'l' && name[3] == 'p')
 192                         result = CMD_HELP;
 193         }
 194         return (result);
 195 }
 196
 197 static void
 198 db_cmd_list(struct command *table, struct command **aux_tablep,
 199             struct command **aux_tablep_end)
 200 {
 201         struct command *cmd;
 202         struct command **aux_cmdp;
 203
 204         for (cmd = table; cmd->name != 0; cmd++) {
 205             db_printf("%-12s", cmd->name);
 206             db_end_line();
 207         }
 208         if (aux_tablep == 0)
 209             return;
 210         for (aux_cmdp = aux_tablep; aux_cmdp < aux_tablep_end; aux_cmdp++) {
 211             db_printf("%-12s", (*aux_cmdp)->name);
 212             db_end_line();
 213         }
 214 }
 215
 216 /*
 217  * Parameters:
 218  *     last_cmdp:       IN_OUT
 219  */
 220 static void
 221 db_command(struct command **last_cmdp, struct command *cmd_table,
 222            struct command **aux_cmd_tablep, struct command **aux_cmd_tablep_end)
 223 {
 224         struct command  *cmd;
 225         int             t;
 226         char            modif[TOK_STRING_SIZE];
 227         db_expr_t       addr, count;
 228         boolean_t       have_addr = FALSE;
 229         int             result;
 230
 231         cmd = NULL;
 232         t = db_read_token();
 233         if (t == tEOL) {
 234             /* empty line repeats last command, at 'next' */
 235             cmd = *last_cmdp;
 236             addr = (db_expr_t)db_next;
 237             have_addr = FALSE;
 238             count = 1;
 239             modif[0] = '\0';
 240         }
 241         else if (t == tEXCL) {
 242             db_fncall((db_expr_t)0, (boolean_t)0, (db_expr_t)0, NULL);
 243             return;
 244         }
 245         else if (t != tIDENT) {
 246             db_printf("?\n");
 247             db_flush_lex();
 248             return;
 249         }
 250         else {
 251             /*
 252              * Search for command
 253              */
 254             while (cmd_table) {
 255                 result = db_cmd_search(db_tok_string,
 256                                        cmd_table,
 257                                        aux_cmd_tablep,
 258                                        aux_cmd_tablep_end,
 259                                        &cmd);
 260                 switch (result) {
 261                     case CMD_NONE:
 262                         db_printf("No such command\n");
 263                         db_flush_lex();
 264                         return;
 265                     case CMD_AMBIGUOUS:
 266                         db_printf("Ambiguous\n");
 267                         db_flush_lex();
 268                         return;
 269                     case CMD_HELP:
 270                         db_cmd_list(cmd_table, aux_cmd_tablep, aux_cmd_tablep_end);
 271                         db_flush_lex();
 272                         return;
 273                     default:
 274                         break;
 275                 }
 276                 if ((cmd_table = cmd->more) != 0) {
 277                     /* XXX usually no more aux's. */
 278                     aux_cmd_tablep = 0;
 279                     if (cmd_table == db_show_cmds) {
 280                         aux_cmd_tablep = SET_BEGIN(db_show_cmd_set);
 281                         aux_cmd_tablep_end = SET_LIMIT(db_show_cmd_set);
 282                     }
 283
 284                     t = db_read_token();
 285                     if (t != tIDENT) {
 286                         db_cmd_list(cmd_table, aux_cmd_tablep, aux_cmd_tablep_end);
 287                         db_flush_lex();
 288                         return;
 289                     }
 290                 }
 291             }
 292
 293             if ((cmd->flag & CS_OWN) == 0) {
 294                 /*
 295                  * Standard syntax:
 296                  * command [/modifier] [addr] [,count]
 297                  */
 298                 t = db_read_token();
 299                 if (t == tSLASH) {
 300                     t = db_read_token();
 301                     if (t != tIDENT && t != tNUMBER) {
 302                         db_printf("Bad modifier\n");
 303                         db_flush_lex();
 304                         return;
 305                     }
 306                     db_strcpy(modif, db_tok_string);
 307                 }
 308                 else {
 309                     db_unread_token(t);
 310                     modif[0] = '\0';
 311                 }
 312
 313                 if (db_expression(&addr)) {
 314                     db_dot = (db_addr_t) addr;
 315                     db_last_addr = db_dot;
 316                     have_addr = TRUE;
 317                 }
 318                 else {
 319                     addr = (db_expr_t) db_dot;
 320                     have_addr = FALSE;
 321                 }
 322                 t = db_read_token();
 323                 if (t == tCOMMA) {
 324                     if (!db_expression(&count)) {
 325                         db_printf("Count missing\n");
 326                         db_flush_lex();
 327                         return;
 328                     }
 329                 }
 330                 else {
 331                     db_unread_token(t);
 332                     count = -1;
 333                 }
 334                 if ((cmd->flag & CS_MORE) == 0) {
 335                     db_skip_to_eol();
 336                 }
 337             }
 338         }
 339         *last_cmdp = cmd;
 340         if (cmd != 0) {
 341             /*
 342              * Execute the command.
 343              */
 344             (*cmd->fcn)(addr, have_addr, count, modif);
 345
 346             if (cmd->flag & CS_SET_DOT) {
 347                 /*
 348                  * If command changes dot, set dot to
 349                  * previous address displayed (if 'ed' style).
 350                  */
 351                 if (db_ed_style) {
 352                     db_dot = db_prev;
 353                 }
 354                 else {
 355                     db_dot = db_next;
 356                 }
 357             }
 358             else {
 359                 /*
 360                  * If command does not change dot,
 361                  * set 'next' location to be the same.
 362                  */
 363                 db_next = db_dot;
 364             }
 365         }
 366 }
 367
 368 /*
 369  * 'show' commands
 370  */
 371
 372 static struct command db_show_all_cmds[] = {
 373 #if 0
 374         { "threads",    db_show_all_threads,    0,      0 },
 375 #endif
 376         { "procs",      db_ps,                  0,      0 },
 377         { NULL }
 378 };
 379
 380 static struct command db_show_cmds[] = {
 381         { "all",        0,                      0,      db_show_all_cmds },
 382         { "registers",  db_show_regs,           0,      0 },
 383         { "breaks",     db_listbreak_cmd,       0,      0 },
 384 #if 0
 385         { "thread",     db_show_one_thread,     0,      0 },
 386 #endif
 387 #if 0
 388         { "port",       ipc_port_print,         0,      0 },
 389 #endif
 390         { NULL, }
 391 };
 392
 393 static struct command db_command_table[] = {
 394         { "print",      db_print_cmd,           0,      0 },
 395         { "p",          db_print_cmd,           0,      0 },
 396         { "examine",    db_examine_cmd,         CS_SET_DOT, 0 },
 397         { "x",          db_examine_cmd,         CS_SET_DOT, 0 },
 398         { "search",     db_search_cmd,          CS_OWN|CS_SET_DOT, 0 },
 399         { "set",        db_set_cmd,             CS_OWN, 0 },
 400         { "write",      db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
 401         { "w",          db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
 402         { "delete",     db_delete_cmd,          0,      0 },
 403         { "d",          db_delete_cmd,          0,      0 },
 404         { "break",      db_breakpoint_cmd,      0,      0 },
 405         { "dwatch",     db_deletewatch_cmd,     0,      0 },
 406         { "watch",      db_watchpoint_cmd,      CS_MORE,0 },
 407         { "dhwatch",    db_deletehwatch_cmd,    0,      0 },
 408         { "hwatch",     db_hwatchpoint_cmd,     0,      0 },
 409         { "step",       db_single_step_cmd,     0,      0 },
 410         { "s",          db_single_step_cmd,     0,      0 },
 411         { "continue",   db_continue_cmd,        0,      0 },
 412         { "c",          db_continue_cmd,        0,      0 },
 413         { "until",      db_trace_until_call_cmd,0,      0 },
 414         { "next",       db_trace_until_matching_cmd,0,  0 },
 415         { "match",      db_trace_until_matching_cmd,0,  0 },
 416         { "trace",      db_stack_trace_cmd,     0,      0 },
 417         { "where",      db_stack_trace_cmd, 0,  0 },
 418         { "call",       db_fncall,              CS_OWN, 0 },
 419         { "show",       0,                      0,      db_show_cmds },
 420         { "ps",         db_ps,                  0,      0 },
 421         { "gdb",        db_gdb,                 0,      0 },
 422         { "reset",      db_reset,               0,      0 },
 423         { NULL, }
 424 };
 425
 426 static struct command   *db_last_command = 0;
 427
 428 #if 0
 429 void
 430 db_help_cmd(void)
 431 {
 432         struct command *cmd = db_command_table;
 433
 434         while (cmd->name != 0) {
 435             db_printf("%-12s", cmd->name);
 436             db_end_line();
 437             cmd++;
 438         }
 439 }
 440 #endif
 441
 442 /*
 443  * At least one non-optional command must be implemented using
 444  * DB_COMMAND() so that db_cmd_set gets created.  Here is one.
 445  */
 446 DB_COMMAND(panic, db_panic)
 447 {
 448         panic("from debugger");
 449 }
 450
 451 void
 452 db_command_loop(void)
 453 {
 454         /*
 455          * Initialize 'prev' and 'next' to dot.
 456          */
 457         db_prev = db_dot;
 458         db_next = db_dot;
 459
 460         db_cmd_loop_done = 0;
 461         while (!db_cmd_loop_done) {
 462
 463             setjmp(db_jmpbuf);
 464             if (db_print_position() != 0)
 465                 db_printf("\n");
 466
 467             db_printf("db> ");
 468             db_read_line();
 469
 470             db_command(&db_last_command, db_command_table,
 471                     SET_BEGIN(db_cmd_set), SET_LIMIT(db_cmd_set));
 472         }
 473 }
 474
 475 void
 476 db_error(char *s)
 477 {
 478         if (s)
 479             db_printf("%s", s);
 480         db_flush_lex();
 481         longjmp(db_jmpbuf, 1);
 482 }
 483
 484
 485 /*
 486  * Call random function:
 487  * !expr(arg,arg,arg)
 488  */
 489 static void
 490 db_fncall(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
 491 {
 492         db_expr_t       fn_addr;
 493 #define MAXARGS         11      /* XXX only 10 are passed */
 494         db_expr_t       args[MAXARGS];
 495         int             nargs = 0;
 496         db_expr_t       retval;
 497         typedef db_expr_t fcn_10args_t (db_expr_t, db_expr_t, db_expr_t,
 498                                             db_expr_t, db_expr_t, db_expr_t,
 499                                             db_expr_t, db_expr_t, db_expr_t,
 500                                             db_expr_t);
 501         fcn_10args_t    *func;
 502         int             t;
 503
 504         if (!db_expression(&fn_addr)) {
 505             db_printf("Bad function\n");
 506             db_flush_lex();
 507             return;
 508         }
 509         func = (fcn_10args_t *)fn_addr; /* XXX */
 510
 511         t = db_read_token();
 512         if (t == tLPAREN) {
 513             if (db_expression(&args[0])) {
 514                 nargs++;
 515                 while ((t = db_read_token()) == tCOMMA) {
 516                     if (nargs == MAXARGS) {
 517                         db_printf("Too many arguments\n");
 518                         db_flush_lex();
 519                         return;
 520                     }
 521                     if (!db_expression(&args[nargs])) {
 522                         db_printf("Argument missing\n");
 523                         db_flush_lex();
 524                         return;
 525                     }
 526                     nargs++;
 527                 }
 528                 db_unread_token(t);
 529             }
 530             if (db_read_token() != tRPAREN) {
 531                 db_printf("?\n");
 532                 db_flush_lex();
 533                 return;
 534             }
 535         }
 536         db_skip_to_eol();
 537
 538         while (nargs < MAXARGS) {
 539             args[nargs++] = 0;
 540         }
 541
 542         retval = (*func)(args[0], args[1], args[2], args[3], args[4],
 543                          args[5], args[6], args[7], args[8], args[9] );
 544         db_printf("%#lr\n", (long)retval);
 545 }
 546
 547 /* Enter GDB remote protocol debugger on the next trap. */
 548
 549 static void
 550 db_gdb(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
 551 {
 552         if (gdb_tab == NULL) {
 553                 db_printf("No gdb port enabled. Set flag 0x80 on desired port\n");
 554                 db_printf("in your configuration file (currently sio only).\n");
 555                 return;
 556         }
 557         boothowto ^= RB_GDB;
 558
 559         db_printf("Next trap will enter %s\n",
 560                    boothowto & RB_GDB ? "GDB remote protocol mode"
 561                                       : "DDB debugger");
 562 }
 563
 564 static void
 565 db_reset(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char * dummy4)
 566 {
 567         cpu_reset();
 568 }