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  * $FreeBSD$
  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/lock.h>
  40 #include <sys/mutex.h>
  41 #include <sys/proc.h>
  42 #include <sys/reboot.h>
  43 #include <sys/signalvar.h>
  44 #include <sys/systm.h>
  45 #include <sys/cons.h>
  46
  47 #include <ddb/ddb.h>
  48 #include <ddb/db_command.h>
  49 #include <ddb/db_lex.h>
  50 #include <ddb/db_output.h>
  51
  52 #include <machine/md_var.h>
  53 #include <machine/setjmp.h>
  54
  55 /*
  56  * Exported global variables
  57  */
  58 boolean_t       db_cmd_loop_done;
  59 db_addr_t       db_dot;
  60 jmp_buf         db_jmpbuf;
  61 db_addr_t       db_last_addr;
  62 db_addr_t       db_prev;
  63 db_addr_t       db_next;
  64
  65 SET_DECLARE(db_cmd_set, struct command);
  66 SET_DECLARE(db_show_cmd_set, struct command);
  67
  68 static db_cmdfcn_t      db_fncall;
  69 static db_cmdfcn_t      db_gdb;
  70 static db_cmdfcn_t      db_kill;
  71 static db_cmdfcn_t      db_reset;
  72
  73 /* XXX this is actually forward-static. */
  74 extern struct command   db_show_cmds[];
  75
  76 /*
  77  * if 'ed' style: 'dot' is set at start of last item printed,
  78  * and '+' points to next line.
  79  * Otherwise: 'dot' points to next item, '..' points to last.
  80  */
  81 static boolean_t        db_ed_style = TRUE;
  82
  83 /*
  84  * Utility routine - discard tokens through end-of-line.
  85  */
  86 void
  87 db_skip_to_eol()
  88 {
  89         int     t;
  90         do {
  91             t = db_read_token();
  92         } while (t != tEOL);
  93 }
  94
  95 /*
  96  * Results of command search.
  97  */
  98 #define CMD_UNIQUE      0
  99 #define CMD_FOUND       1
 100 #define CMD_NONE        2
 101 #define CMD_AMBIGUOUS   3
 102 #define CMD_HELP        4
 103
 104 static void     db_cmd_list(struct command *table, struct command **aux_tablep,
 105                     struct command **aux_tablep_end);
 106 static int      db_cmd_search(char *name, struct command *table,
 107                     struct command **aux_tablep,
 108                     struct command **aux_tablep_end, struct command **cmdp);
 109 static void     db_command(struct command **last_cmdp,
 110                     struct command *cmd_table, struct command **aux_cmd_tablep,
 111                     struct command **aux_cmd_tablep_end);
 112
 113 /*
 114  * Search for command prefix.
 115  */
 116 static int
 117 db_cmd_search(name, table, aux_tablep, aux_tablep_end, cmdp)
 118         char *          name;
 119         struct command  *table;
 120         struct command  **aux_tablep;
 121         struct command  **aux_tablep_end;
 122         struct command  **cmdp; /* out */
 123 {
 124         struct command  *cmd;
 125         struct command  **aux_cmdp;
 126         int             result = CMD_NONE;
 127
 128         for (cmd = table; cmd->name != 0; cmd++) {
 129             register char *lp;
 130             register char *rp;
 131             register int  c;
 132
 133             lp = name;
 134             rp = cmd->name;
 135             while ((c = *lp) == *rp) {
 136                 if (c == 0) {
 137                     /* complete match */
 138                     *cmdp = cmd;
 139                     return (CMD_UNIQUE);
 140                 }
 141                 lp++;
 142                 rp++;
 143             }
 144             if (c == 0) {
 145                 /* end of name, not end of command -
 146                    partial match */
 147                 if (result == CMD_FOUND) {
 148                     result = CMD_AMBIGUOUS;
 149                     /* but keep looking for a full match -
 150                        this lets us match single letters */
 151                 }
 152                 else {
 153                     *cmdp = cmd;
 154                     result = CMD_FOUND;
 155                 }
 156             }
 157         }
 158         if (result == CMD_NONE && aux_tablep != 0)
 159             /* XXX repeat too much code. */
 160             for (aux_cmdp = aux_tablep; aux_cmdp < aux_tablep_end; aux_cmdp++) {
 161                 register char *lp;
 162                 register char *rp;
 163                 register int  c;
 164
 165                 lp = name;
 166                 rp = (*aux_cmdp)->name;
 167                 while ((c = *lp) == *rp) {
 168                     if (c == 0) {
 169                         /* complete match */
 170                         *cmdp = *aux_cmdp;
 171                         return (CMD_UNIQUE);
 172                     }
 173                     lp++;
 174                     rp++;
 175                 }
 176                 if (c == 0) {
 177                     /* end of name, not end of command -
 178                        partial match */
 179                     if (result == CMD_FOUND) {
 180                         result = CMD_AMBIGUOUS;
 181                         /* but keep looking for a full match -
 182                            this lets us match single letters */
 183                     }
 184                     else {
 185                         *cmdp = *aux_cmdp;
 186                         result = CMD_FOUND;
 187                     }
 188                 }
 189             }
 190         if (result == CMD_NONE) {
 191             /* check for 'help' */
 192                 if (name[0] == 'h' && name[1] == 'e'
 193                     && name[2] == 'l' && name[3] == 'p')
 194                         result = CMD_HELP;
 195         }
 196         return (result);
 197 }
 198
 199 static void
 200 db_cmd_list(table, aux_tablep, aux_tablep_end)
 201         struct command *table;
 202         struct command **aux_tablep;
 203         struct command **aux_tablep_end;
 204 {
 205         register struct command *cmd;
 206         register struct command **aux_cmdp;
 207
 208         for (cmd = table; cmd->name != 0; cmd++) {
 209             db_printf("%-12s", cmd->name);
 210             db_end_line();
 211         }
 212         if (aux_tablep == 0)
 213             return;
 214         for (aux_cmdp = aux_tablep; aux_cmdp < aux_tablep_end; aux_cmdp++) {
 215             db_printf("%-12s", (*aux_cmdp)->name);
 216             db_end_line();
 217         }
 218 }
 219
 220 static void
 221 db_command(last_cmdp, cmd_table, aux_cmd_tablep, aux_cmd_tablep_end)
 222         struct command  **last_cmdp;    /* IN_OUT */
 223         struct command  *cmd_table;
 224         struct command  **aux_cmd_tablep;
 225         struct command  **aux_cmd_tablep_end;
 226 {
 227         struct command  *cmd;
 228         int             t;
 229         char            modif[TOK_STRING_SIZE];
 230         db_expr_t       addr, count;
 231         boolean_t       have_addr = FALSE;
 232         int             result;
 233
 234         t = db_read_token();
 235         if (t == tEOL) {
 236             /* empty line repeats last command, at 'next' */
 237             cmd = *last_cmdp;
 238             addr = (db_expr_t)db_next;
 239             have_addr = FALSE;
 240             count = 1;
 241             modif[0] = '\0';
 242         }
 243         else if (t == tEXCL) {
 244             db_fncall((db_expr_t)0, (boolean_t)0, (db_expr_t)0, (char *)0);
 245             return;
 246         }
 247         else if (t != tIDENT) {
 248             db_printf("?\n");
 249             db_flush_lex();
 250             return;
 251         }
 252         else {
 253             /*
 254              * Search for command
 255              */
 256             while (cmd_table) {
 257                 result = db_cmd_search(db_tok_string,
 258                                        cmd_table,
 259                                        aux_cmd_tablep,
 260                                        aux_cmd_tablep_end,
 261                                        &cmd);
 262                 switch (result) {
 263                     case CMD_NONE:
 264                         db_printf("No such command\n");
 265                         db_flush_lex();
 266                         return;
 267                     case CMD_AMBIGUOUS:
 268                         db_printf("Ambiguous\n");
 269                         db_flush_lex();
 270                         return;
 271                     case CMD_HELP:
 272                         db_cmd_list(cmd_table, aux_cmd_tablep, aux_cmd_tablep_end);
 273                         db_flush_lex();
 274                         return;
 275                     default:
 276                         break;
 277                 }
 278                 if ((cmd_table = cmd->more) != 0) {
 279                     /* XXX usually no more aux's. */
 280                     aux_cmd_tablep = 0;
 281                     if (cmd_table == db_show_cmds) {
 282                         aux_cmd_tablep = SET_BEGIN(db_show_cmd_set);
 283                         aux_cmd_tablep_end = SET_LIMIT(db_show_cmd_set);
 284                     }
 285
 286                     t = db_read_token();
 287                     if (t != tIDENT) {
 288                         db_cmd_list(cmd_table, aux_cmd_tablep, aux_cmd_tablep_end);
 289                         db_flush_lex();
 290                         return;
 291                     }
 292                 }
 293             }
 294
 295             if ((cmd->flag & CS_OWN) == 0) {
 296                 /*
 297                  * Standard syntax:
 298                  * command [/modifier] [addr] [,count]
 299                  */
 300                 t = db_read_token();
 301                 if (t == tSLASH) {
 302                     t = db_read_token();
 303                     if (t != tIDENT) {
 304                         db_printf("Bad modifier\n");
 305                         db_flush_lex();
 306                         return;
 307                     }
 308                     db_strcpy(modif, db_tok_string);
 309                 }
 310                 else {
 311                     db_unread_token(t);
 312                     modif[0] = '\0';
 313                 }
 314
 315                 if (db_expression(&addr)) {
 316                     db_dot = (db_addr_t) addr;
 317                     db_last_addr = db_dot;
 318                     have_addr = TRUE;
 319                 }
 320                 else {
 321                     addr = (db_expr_t) db_dot;
 322                     have_addr = FALSE;
 323                 }
 324                 t = db_read_token();
 325                 if (t == tCOMMA) {
 326                     if (!db_expression(&count)) {
 327                         db_printf("Count missing\n");
 328                         db_flush_lex();
 329                         return;
 330                     }
 331                 }
 332                 else {
 333                     db_unread_token(t);
 334                     count = -1;
 335                 }
 336                 if ((cmd->flag & CS_MORE) == 0) {
 337                     db_skip_to_eol();
 338                 }
 339             }
 340         }
 341         *last_cmdp = cmd;
 342         if (cmd != 0) {
 343             /*
 344              * Execute the command.
 345              */
 346             (*cmd->fcn)(addr, have_addr, count, modif);
 347
 348             if (cmd->flag & CS_SET_DOT) {
 349                 /*
 350                  * If command changes dot, set dot to
 351                  * previous address displayed (if 'ed' style).
 352                  */
 353                 if (db_ed_style) {
 354                     db_dot = db_prev;
 355                 }
 356                 else {
 357                     db_dot = db_next;
 358                 }
 359             }
 360             else {
 361                 /*
 362                  * If command does not change dot,
 363                  * set 'next' location to be the same.
 364                  */
 365                 db_next = db_dot;
 366             }
 367         }
 368 }
 369
 370 /*
 371  * 'show' commands
 372  */
 373
 374 static struct command db_show_all_cmds[] = {
 375 #if 0
 376         { "threads",    db_show_all_threads,    0,      0 },
 377 #endif
 378         { "procs",      db_ps,                  0,      0 },
 379         { (char *)0 }
 380 };
 381
 382 static struct command db_show_cmds[] = {
 383         { "all",        0,                      0,      db_show_all_cmds },
 384         { "registers",  db_show_regs,           0,      0 },
 385         { "breaks",     db_listbreak_cmd,       0,      0 },
 386 #if 0
 387         { "thread",     db_show_one_thread,     0,      0 },
 388 #endif
 389 #if 0
 390         { "port",       ipc_port_print,         0,      0 },
 391 #endif
 392         { (char *)0, }
 393 };
 394
 395 static struct command db_command_table[] = {
 396         { "print",      db_print_cmd,           0,      0 },
 397         { "p",          db_print_cmd,           0,      0 },
 398         { "examine",    db_examine_cmd,         CS_SET_DOT, 0 },
 399         { "x",          db_examine_cmd,         CS_SET_DOT, 0 },
 400         { "search",     db_search_cmd,          CS_OWN|CS_SET_DOT, 0 },
 401         { "set",        db_set_cmd,             CS_OWN, 0 },
 402         { "write",      db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
 403         { "w",          db_write_cmd,           CS_MORE|CS_SET_DOT, 0 },
 404         { "delete",     db_delete_cmd,          0,      0 },
 405         { "d",          db_delete_cmd,          0,      0 },
 406         { "break",      db_breakpoint_cmd,      0,      0 },
 407         { "dwatch",     db_deletewatch_cmd,     0,      0 },
 408         { "watch",      db_watchpoint_cmd,      CS_MORE,0 },
 409         { "dhwatch",    db_deletehwatch_cmd,    0,      0 },
 410         { "hwatch",     db_hwatchpoint_cmd,     0,      0 },
 411         { "step",       db_single_step_cmd,     0,      0 },
 412         { "s",          db_single_step_cmd,     0,      0 },
 413         { "continue",   db_continue_cmd,        0,      0 },
 414         { "c",          db_continue_cmd,        0,      0 },
 415         { "until",      db_trace_until_call_cmd,0,      0 },
 416         { "next",       db_trace_until_matching_cmd,0,  0 },
 417         { "match",      db_trace_until_matching_cmd,0,  0 },
 418         { "trace",      db_stack_trace_cmd,     0,      0 },
 419         { "call",       db_fncall,              CS_OWN, 0 },
 420         { "show",       0,                      0,      db_show_cmds },
 421         { "ps",         db_ps,                  0,      0 },
 422         { "gdb",        db_gdb,                 0,      0 },
 423         { "reset",      db_reset,               0,      0 },
 424         { "kill",       db_kill,                CS_OWN, 0 },
 425         { (char *)0, }
 426 };
 427
 428 static struct command   *db_last_command = 0;
 429
 430 #if 0
 431 void
 432 db_help_cmd()
 433 {
 434         struct command *cmd = db_command_table;
 435
 436         while (cmd->name != 0) {
 437             db_printf("%-12s", cmd->name);
 438             db_end_line();
 439             cmd++;
 440         }
 441 }
 442 #endif
 443
 444 /*
 445  * At least one non-optional command must be implemented using
 446  * DB_COMMAND() so that db_cmd_set gets created.  Here is one.
 447  */
 448 DB_COMMAND(panic, db_panic)
 449 {
 450         panic("from debugger");
 451 }
 452
 453 void
 454 db_command_loop()
 455 {
 456         /*
 457          * Initialize 'prev' and 'next' to dot.
 458          */
 459         db_prev = db_dot;
 460         db_next = db_dot;
 461
 462         db_cmd_loop_done = 0;
 463         while (!db_cmd_loop_done) {
 464
 465             (void) setjmp(db_jmpbuf);
 466             if (db_print_position() != 0)
 467                 db_printf("\n");
 468
 469             db_printf("db> ");
 470             (void) db_read_line();
 471
 472             db_command(&db_last_command, db_command_table,
 473                        SET_BEGIN(db_cmd_set), SET_LIMIT(db_cmd_set));
 474         }
 475 }
 476
 477 void
 478 db_error(s)
 479         const char *s;
 480 {
 481         if (s)
 482             db_printf("%s", s);
 483         db_flush_lex();
 484         longjmp(db_jmpbuf, 1);
 485 }
 486
 487
 488 /*
 489  * Call random function:
 490  * !expr(arg,arg,arg)
 491  */
 492 static void
 493 db_fncall(dummy1, dummy2, dummy3, dummy4)
 494         db_expr_t       dummy1;
 495         boolean_t       dummy2;
 496         db_expr_t       dummy3;
 497         char *          dummy4;
 498 {
 499         db_expr_t       fn_addr;
 500 #define MAXARGS         11      /* XXX only 10 are passed */
 501         db_expr_t       args[MAXARGS];
 502         int             nargs = 0;
 503         db_expr_t       retval;
 504         typedef db_expr_t fcn_10args_t(db_expr_t, db_expr_t, db_expr_t,
 505                             db_expr_t, db_expr_t, db_expr_t, db_expr_t,
 506                             db_expr_t, db_expr_t, db_expr_t);
 507         fcn_10args_t    *func;
 508         int             t;
 509
 510         if (!db_expression(&fn_addr)) {
 511             db_printf("Bad function\n");
 512             db_flush_lex();
 513             return;
 514         }
 515         func = (fcn_10args_t *)fn_addr; /* XXX */
 516
 517         t = db_read_token();
 518         if (t == tLPAREN) {
 519             if (db_expression(&args[0])) {
 520                 nargs++;
 521                 while ((t = db_read_token()) == tCOMMA) {
 522                     if (nargs == MAXARGS) {
 523                         db_printf("Too many arguments\n");
 524                         db_flush_lex();
 525                         return;
 526                     }
 527                     if (!db_expression(&args[nargs])) {
 528                         db_printf("Argument missing\n");
 529                         db_flush_lex();
 530                         return;
 531                     }
 532                     nargs++;
 533                 }
 534                 db_unread_token(t);
 535             }
 536             if (db_read_token() != tRPAREN) {
 537                 db_printf("?\n");
 538                 db_flush_lex();
 539                 return;
 540             }
 541         }
 542         db_skip_to_eol();
 543
 544         while (nargs < MAXARGS) {
 545             args[nargs++] = 0;
 546         }
 547
 548         retval = (*func)(args[0], args[1], args[2], args[3], args[4],
 549                          args[5], args[6], args[7], args[8], args[9] );
 550         db_printf("%#lr\n", (long)retval);
 551 }
 552
 553 /* Enter GDB remote protocol debugger on the next trap. */
 554
 555 dev_t      gdbdev = NODEV;
 556 cn_getc_t *gdb_getc;
 557 cn_putc_t *gdb_putc;
 558
 559 static void
 560 db_gdb (dummy1, dummy2, dummy3, dummy4)
 561         db_expr_t       dummy1;
 562         boolean_t       dummy2;
 563         db_expr_t       dummy3;
 564         char *          dummy4;
 565 {
 566
 567         if (gdbdev == NODEV) {
 568                 db_printf("No gdb port enabled. Set flag 0x80 on desired port\n");
 569                 db_printf("in your configuration file (currently sio only).\n");
 570                 return;
 571         }
 572         boothowto ^= RB_GDB;
 573
 574         db_printf("Next trap will enter %s\n",
 575                    boothowto & RB_GDB ? "GDB remote protocol mode"
 576                                       : "DDB debugger");
 577 }
 578
 579 static void
 580 db_kill(dummy1, dummy2, dummy3, dummy4)
 581         db_expr_t       dummy1;
 582         boolean_t       dummy2;
 583         db_expr_t       dummy3;
 584         char *          dummy4;
 585 {
 586         db_expr_t old_radix, pid, sig;
 587         struct proc *p;
 588
 589 #define DB_ERROR(f)     do { db_printf f; db_flush_lex(); goto out; } while (0)
 590
 591         /*
 592          * PIDs and signal numbers are typically represented in base
 593          * 10, so make that the default here.  It can, of course, be
 594          * overridden by specifying a prefix.
 595          */
 596         old_radix = db_radix;
 597         db_radix = 10;
 598         /* Retrieve arguments. */
 599         if (!db_expression(&sig))
 600                 DB_ERROR(("Missing signal number\n"));
 601         if (!db_expression(&pid))
 602                 DB_ERROR(("Missing process ID\n"));
 603         db_skip_to_eol();
 604         if (sig < 0 || sig > _SIG_MAXSIG)
 605                 DB_ERROR(("Signal number out of range\n"));
 606
 607         /*
 608          * Find the process in question.  allproc_lock is not needed
 609          * since we're in DDB.
 610          */
 611         /* sx_slock(&allproc_lock); */
 612         LIST_FOREACH(p, &allproc, p_list)
 613             if (p->p_pid == pid)
 614                     break;
 615         /* sx_sunlock(&allproc_lock); */
 616         if (p == NULL)
 617                 DB_ERROR(("Can't find process with pid %ld\n", (long) pid));
 618
 619         /* If it's already locked, bail; otherwise, do the deed. */
 620         if (PROC_TRYLOCK(p) == 0)
 621                 DB_ERROR(("Can't lock process with pid %ld\n", (long) pid));
 622         else {
 623                 psignal(p, sig);
 624                 PROC_UNLOCK(p);
 625         }
 626
 627 out:
 628         db_radix = old_radix;
 629 #undef DB_ERROR
 630 }
 631
 632 static void
 633 db_reset(dummy1, dummy2, dummy3, dummy4)
 634         db_expr_t       dummy1;
 635         boolean_t       dummy2;
 636         db_expr_t       dummy3;
 637         char *          dummy4;
 638 {
 639
 640         cpu_reset();
 641 }