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("$FreeBSD$"); 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 int 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_active; 76 static db_cmdfcn_t db_stack_trace_all; 77 static db_cmdfcn_t db_watchdog; 78 79 /* 80 * 'show' commands 81 */ 82 83 static struct command db_show_active_cmds[] = { 84 { "trace", db_stack_trace_active, 0, NULL }, 85 }; 86 struct command_table db_show_active_table = 87 LIST_HEAD_INITIALIZER(db_show_active_table); 88 89 static struct command db_show_all_cmds[] = { 90 { "trace", db_stack_trace_all, 0, NULL }, 91 }; 92 struct command_table db_show_all_table = 93 LIST_HEAD_INITIALIZER(db_show_all_table); 94 95 static struct command db_show_cmds[] = { 96 { "active", 0, 0, &db_show_active_table }, 97 { "all", 0, 0, &db_show_all_table }, 98 { "registers", db_show_regs, 0, NULL }, 99 { "breaks", db_listbreak_cmd, 0, NULL }, 100 { "threads", db_show_threads, 0, NULL }, 101 }; 102 struct command_table db_show_table = LIST_HEAD_INITIALIZER(db_show_table); 103 104 static struct command db_cmds[] = { 105 { "print", db_print_cmd, 0, NULL }, 106 { "p", db_print_cmd, 0, NULL }, 107 { "examine", db_examine_cmd, CS_SET_DOT, NULL }, 108 { "x", db_examine_cmd, CS_SET_DOT, NULL }, 109 { "search", db_search_cmd, CS_OWN|CS_SET_DOT, NULL }, 110 { "set", db_set_cmd, CS_OWN, NULL }, 111 { "write", db_write_cmd, CS_MORE|CS_SET_DOT, NULL }, 112 { "w", db_write_cmd, CS_MORE|CS_SET_DOT, NULL }, 113 { "delete", db_delete_cmd, 0, NULL }, 114 { "d", db_delete_cmd, 0, NULL }, 115 { "dump", db_dump, 0, NULL }, 116 { "break", db_breakpoint_cmd, 0, NULL }, 117 { "b", db_breakpoint_cmd, 0, NULL }, 118 { "dwatch", db_deletewatch_cmd, 0, NULL }, 119 { "watch", db_watchpoint_cmd, CS_MORE,NULL }, 120 { "dhwatch", db_deletehwatch_cmd, 0, NULL }, 121 { "hwatch", db_hwatchpoint_cmd, 0, NULL }, 122 { "step", db_single_step_cmd, 0, NULL }, 123 { "s", db_single_step_cmd, 0, NULL }, 124 { "continue", db_continue_cmd, 0, NULL }, 125 { "c", db_continue_cmd, 0, NULL }, 126 { "until", db_trace_until_call_cmd,0, NULL }, 127 { "next", db_trace_until_matching_cmd,0, NULL }, 128 { "match", db_trace_until_matching_cmd,0, NULL }, 129 { "trace", db_stack_trace, CS_OWN, NULL }, 130 { "t", db_stack_trace, CS_OWN, NULL }, 131 /* XXX alias for active trace */ 132 { "acttrace", db_stack_trace_active, 0, NULL }, 133 /* XXX alias for all trace */ 134 { "alltrace", db_stack_trace_all, 0, NULL }, 135 { "where", db_stack_trace, CS_OWN, NULL }, 136 { "bt", db_stack_trace, CS_OWN, NULL }, 137 { "call", db_fncall, CS_OWN, NULL }, 138 { "show", 0, 0, &db_show_table }, 139 { "ps", db_ps, 0, NULL }, 140 { "gdb", db_gdb, 0, NULL }, 141 { "halt", db_halt, 0, NULL }, 142 { "reboot", db_reset, 0, NULL }, 143 { "reset", db_reset, 0, NULL }, 144 { "kill", db_kill, CS_OWN, NULL }, 145 { "watchdog", db_watchdog, CS_OWN, NULL }, 146 { "thread", db_set_thread, CS_OWN, NULL }, 147 { "run", db_run_cmd, CS_OWN, NULL }, 148 { "script", db_script_cmd, CS_OWN, NULL }, 149 { "scripts", db_scripts_cmd, 0, NULL }, 150 { "unscript", db_unscript_cmd, CS_OWN, NULL }, 151 { "capture", db_capture_cmd, CS_OWN, NULL }, 152 { "textdump", db_textdump_cmd, CS_OWN, NULL }, 153 { "findstack", db_findstack_cmd, 0, NULL }, 154 }; 155 struct command_table db_cmd_table = LIST_HEAD_INITIALIZER(db_cmd_table); 156 157 static struct command *db_last_command = NULL; 158 159 /* 160 * if 'ed' style: 'dot' is set at start of last item printed, 161 * and '+' points to next line. 162 * Otherwise: 'dot' points to next item, '..' points to last. 163 */ 164 static bool db_ed_style = true; 165 166 /* 167 * Utility routine - discard tokens through end-of-line. 168 */ 169 void 170 db_skip_to_eol(void) 171 { 172 int t; 173 do { 174 t = db_read_token(); 175 } while (t != tEOL); 176 } 177 178 /* 179 * Results of command search. 180 */ 181 #define CMD_UNIQUE 0 182 #define CMD_FOUND 1 183 #define CMD_NONE 2 184 #define CMD_AMBIGUOUS 3 185 #define CMD_HELP 4 186 187 static void db_cmd_match(char *name, struct command *cmd, 188 struct command **cmdp, int *resultp); 189 static void db_cmd_list(struct command_table *table); 190 static int db_cmd_search(char *name, struct command_table *table, 191 struct command **cmdp); 192 static void db_command(struct command **last_cmdp, 193 struct command_table *cmd_table, int dopager); 194 195 /* 196 * Initialize the command lists from the static tables. 197 */ 198 void 199 db_command_init(void) 200 { 201 #define N(a) (sizeof(a) / sizeof(a[0])) 202 int i; 203 204 for (i = 0; i < N(db_cmds); i++) 205 db_command_register(&db_cmd_table, &db_cmds[i]); 206 for (i = 0; i < N(db_show_cmds); i++) 207 db_command_register(&db_show_table, &db_show_cmds[i]); 208 for (i = 0; i < N(db_show_active_cmds); i++) 209 db_command_register(&db_show_active_table, 210 &db_show_active_cmds[i]); 211 for (i = 0; i < N(db_show_all_cmds); i++) 212 db_command_register(&db_show_all_table, &db_show_all_cmds[i]); 213 #undef N 214 } 215 216 /* 217 * Register a command. 218 */ 219 void 220 db_command_register(struct command_table *list, struct command *cmd) 221 { 222 struct command *c, *last; 223 224 last = NULL; 225 LIST_FOREACH(c, list, next) { 226 int n = strcmp(cmd->name, c->name); 227 228 /* Check that the command is not already present. */ 229 if (n == 0) { 230 printf("%s: Warning, the command \"%s\" already exists;" 231 " ignoring request\n", __func__, cmd->name); 232 return; 233 } 234 if (n < 0) { 235 /* NB: keep list sorted lexicographically */ 236 LIST_INSERT_BEFORE(c, cmd, next); 237 return; 238 } 239 last = c; 240 } 241 if (last == NULL) 242 LIST_INSERT_HEAD(list, cmd, next); 243 else 244 LIST_INSERT_AFTER(last, cmd, next); 245 } 246 247 /* 248 * Remove a command previously registered with db_command_register. 249 */ 250 void 251 db_command_unregister(struct command_table *list, struct command *cmd) 252 { 253 struct command *c; 254 255 LIST_FOREACH(c, list, next) { 256 if (cmd == c) { 257 LIST_REMOVE(cmd, next); 258 return; 259 } 260 } 261 /* NB: intentionally quiet */ 262 } 263 264 /* 265 * Helper function to match a single command. 266 */ 267 static void 268 db_cmd_match(char *name, struct command *cmd, struct command **cmdp, 269 int *resultp) 270 { 271 char *lp, *rp; 272 int c; 273 274 lp = name; 275 rp = cmd->name; 276 while ((c = *lp) == *rp) { 277 if (c == 0) { 278 /* complete match */ 279 *cmdp = cmd; 280 *resultp = CMD_UNIQUE; 281 return; 282 } 283 lp++; 284 rp++; 285 } 286 if (c == 0) { 287 /* end of name, not end of command - 288 partial match */ 289 if (*resultp == CMD_FOUND) { 290 *resultp = CMD_AMBIGUOUS; 291 /* but keep looking for a full match - 292 this lets us match single letters */ 293 } else { 294 *cmdp = cmd; 295 *resultp = CMD_FOUND; 296 } 297 } 298 } 299 300 /* 301 * Search for command prefix. 302 */ 303 static int 304 db_cmd_search(char *name, struct command_table *table, struct command **cmdp) 305 { 306 struct command *cmd; 307 int result = CMD_NONE; 308 309 LIST_FOREACH(cmd, table, next) { 310 db_cmd_match(name,cmd,cmdp,&result); 311 if (result == CMD_UNIQUE) 312 break; 313 } 314 315 if (result == CMD_NONE) { 316 /* check for 'help' */ 317 if (name[0] == 'h' && name[1] == 'e' 318 && name[2] == 'l' && name[3] == 'p') 319 result = CMD_HELP; 320 } 321 return (result); 322 } 323 324 static void 325 db_cmd_list(struct command_table *table) 326 { 327 struct command *cmd; 328 int have_subcommands; 329 330 have_subcommands = 0; 331 LIST_FOREACH(cmd, table, next) { 332 if (cmd->more != NULL) 333 have_subcommands++; 334 db_printf("%-16s", cmd->name); 335 db_end_line(16); 336 } 337 338 if (have_subcommands > 0) { 339 db_printf("\nThe following have subcommands; append \"help\" " 340 "to list (e.g. \"show help\"):\n"); 341 LIST_FOREACH(cmd, table, next) { 342 if (cmd->more == NULL) 343 continue; 344 db_printf("%-16s", cmd->name); 345 db_end_line(16); 346 } 347 } 348 } 349 350 static void 351 db_command(struct command **last_cmdp, struct command_table *cmd_table, 352 int dopager) 353 { 354 struct command *cmd = NULL; 355 int t; 356 char modif[TOK_STRING_SIZE]; 357 db_expr_t addr, count; 358 bool have_addr = false; 359 int result; 360 361 t = db_read_token(); 362 if (t == tEOL) { 363 /* empty line repeats last command, at 'next' */ 364 cmd = *last_cmdp; 365 addr = (db_expr_t)db_next; 366 have_addr = false; 367 count = 1; 368 modif[0] = '\0'; 369 } 370 else if (t == tEXCL) { 371 db_fncall((db_expr_t)0, (bool)false, (db_expr_t)0, (char *)0); 372 return; 373 } 374 else if (t != tIDENT) { 375 db_printf("Unrecognized input; use \"help\" " 376 "to list available commands\n"); 377 db_flush_lex(); 378 return; 379 } 380 else { 381 /* 382 * Search for command 383 */ 384 while (cmd_table) { 385 result = db_cmd_search(db_tok_string, 386 cmd_table, 387 &cmd); 388 switch (result) { 389 case CMD_NONE: 390 db_printf("No such command; use \"help\" " 391 "to list available commands\n"); 392 db_flush_lex(); 393 return; 394 case CMD_AMBIGUOUS: 395 db_printf("Ambiguous\n"); 396 db_flush_lex(); 397 return; 398 case CMD_HELP: 399 if (cmd_table == &db_cmd_table) { 400 db_printf("This is ddb(4), the kernel debugger; " 401 "see http://man.freebsd.org/ddb/4 for help.\n"); 402 db_printf("Use \"bt\" for backtrace, \"dump\" for " 403 "kernel core dump, \"reset\" to reboot.\n"); 404 db_printf("Available commands:\n"); 405 } 406 db_cmd_list(cmd_table); 407 db_flush_lex(); 408 return; 409 default: 410 break; 411 } 412 if ((cmd_table = cmd->more) != NULL) { 413 t = db_read_token(); 414 if (t != tIDENT) { 415 db_printf("Subcommand required; " 416 "available subcommands:\n"); 417 db_cmd_list(cmd_table); 418 db_flush_lex(); 419 return; 420 } 421 } 422 } 423 424 if ((cmd->flag & CS_OWN) == 0) { 425 /* 426 * Standard syntax: 427 * command [/modifier] [addr] [,count] 428 */ 429 t = db_read_token(); 430 if (t == tSLASH) { 431 t = db_read_token(); 432 if (t != tIDENT) { 433 db_printf("Bad modifier\n"); 434 db_flush_lex(); 435 return; 436 } 437 db_strcpy(modif, db_tok_string); 438 } 439 else { 440 db_unread_token(t); 441 modif[0] = '\0'; 442 } 443 444 if (db_expression(&addr)) { 445 db_dot = (db_addr_t) addr; 446 db_last_addr = db_dot; 447 have_addr = true; 448 } 449 else { 450 addr = (db_expr_t) db_dot; 451 have_addr = false; 452 } 453 t = db_read_token(); 454 if (t == tCOMMA) { 455 if (!db_expression(&count)) { 456 db_printf("Count missing\n"); 457 db_flush_lex(); 458 return; 459 } 460 } 461 else { 462 db_unread_token(t); 463 count = -1; 464 } 465 if ((cmd->flag & CS_MORE) == 0) { 466 db_skip_to_eol(); 467 } 468 } 469 } 470 *last_cmdp = cmd; 471 if (cmd != NULL) { 472 /* 473 * Execute the command. 474 */ 475 if (dopager) 476 db_enable_pager(); 477 else 478 db_disable_pager(); 479 (*cmd->fcn)(addr, have_addr, count, modif); 480 if (dopager) 481 db_disable_pager(); 482 483 if (cmd->flag & CS_SET_DOT) { 484 /* 485 * If command changes dot, set dot to 486 * previous address displayed (if 'ed' style). 487 */ 488 if (db_ed_style) { 489 db_dot = db_prev; 490 } 491 else { 492 db_dot = db_next; 493 } 494 } 495 else { 496 /* 497 * If command does not change dot, 498 * set 'next' location to be the same. 499 */ 500 db_next = db_dot; 501 } 502 } 503 } 504 505 /* 506 * At least one non-optional command must be implemented using 507 * DB_COMMAND() so that db_cmd_set gets created. Here is one. 508 */ 509 DB_COMMAND(panic, db_panic) 510 { 511 db_disable_pager(); 512 panic("from debugger"); 513 } 514 515 void 516 db_command_loop(void) 517 { 518 /* 519 * Initialize 'prev' and 'next' to dot. 520 */ 521 db_prev = db_dot; 522 db_next = db_dot; 523 524 db_cmd_loop_done = 0; 525 while (!db_cmd_loop_done) { 526 if (db_print_position() != 0) 527 db_printf("\n"); 528 529 db_printf("db> "); 530 (void) db_read_line(); 531 532 db_command(&db_last_command, &db_cmd_table, /* dopager */ 1); 533 } 534 } 535 536 /* 537 * Execute a command on behalf of a script. The caller is responsible for 538 * making sure that the command string is < DB_MAXLINE or it will be 539 * truncated. 540 * 541 * XXXRW: Runs by injecting faked input into DDB input stream; it would be 542 * nicer to use an alternative approach that didn't mess with the previous 543 * command buffer. 544 */ 545 void 546 db_command_script(const char *command) 547 { 548 db_prev = db_next = db_dot; 549 db_inject_line(command); 550 db_command(&db_last_command, &db_cmd_table, /* dopager */ 0); 551 } 552 553 void 554 db_error(const char *s) 555 { 556 if (s) 557 db_printf("%s", s); 558 db_flush_lex(); 559 kdb_reenter(); 560 } 561 562 static void 563 db_dump(db_expr_t dummy, bool dummy2, db_expr_t dummy3, char *dummy4) 564 { 565 int error; 566 567 if (textdump_pending) { 568 db_printf("textdump_pending set.\n" 569 "run \"textdump unset\" first or \"textdump dump\" for a textdump.\n"); 570 return; 571 } 572 error = doadump(false); 573 if (error) { 574 db_printf("Cannot dump: "); 575 switch (error) { 576 case EBUSY: 577 db_printf("debugger got invoked while dumping.\n"); 578 break; 579 case ENXIO: 580 db_printf("no dump device specified.\n"); 581 break; 582 default: 583 db_printf("unknown error (error=%d).\n", error); 584 break; 585 } 586 } 587 } 588 589 /* 590 * Call random function: 591 * !expr(arg,arg,arg) 592 */ 593 594 /* The generic implementation supports a maximum of 10 arguments. */ 595 typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t, 596 db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t); 597 598 static __inline int 599 db_fncall_generic(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[]) 600 { 601 __db_f *f = (__db_f *)addr; 602 603 if (nargs > 10) { 604 db_printf("Too many arguments (max 10)\n"); 605 return (0); 606 } 607 *rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5], 608 args[6], args[7], args[8], args[9]); 609 return (1); 610 } 611 612 static void 613 db_fncall(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 614 { 615 db_expr_t fn_addr; 616 db_expr_t args[DB_MAXARGS]; 617 int nargs = 0; 618 db_expr_t retval; 619 int t; 620 621 if (!db_expression(&fn_addr)) { 622 db_printf("Bad function\n"); 623 db_flush_lex(); 624 return; 625 } 626 627 t = db_read_token(); 628 if (t == tLPAREN) { 629 if (db_expression(&args[0])) { 630 nargs++; 631 while ((t = db_read_token()) == tCOMMA) { 632 if (nargs == DB_MAXARGS) { 633 db_printf("Too many arguments (max %d)\n", DB_MAXARGS); 634 db_flush_lex(); 635 return; 636 } 637 if (!db_expression(&args[nargs])) { 638 db_printf("Argument missing\n"); 639 db_flush_lex(); 640 return; 641 } 642 nargs++; 643 } 644 db_unread_token(t); 645 } 646 if (db_read_token() != tRPAREN) { 647 db_printf("Mismatched parens\n"); 648 db_flush_lex(); 649 return; 650 } 651 } 652 db_skip_to_eol(); 653 db_disable_pager(); 654 655 if (DB_CALL(fn_addr, &retval, nargs, args)) 656 db_printf("= %#lr\n", (long)retval); 657 } 658 659 static void 660 db_halt(db_expr_t dummy, bool dummy2, db_expr_t dummy3, char *dummy4) 661 { 662 663 cpu_halt(); 664 } 665 666 static void 667 db_kill(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 668 { 669 db_expr_t old_radix, pid, sig; 670 struct proc *p; 671 672 #define DB_ERROR(f) do { db_printf f; db_flush_lex(); goto out; } while (0) 673 674 /* 675 * PIDs and signal numbers are typically represented in base 676 * 10, so make that the default here. It can, of course, be 677 * overridden by specifying a prefix. 678 */ 679 old_radix = db_radix; 680 db_radix = 10; 681 /* Retrieve arguments. */ 682 if (!db_expression(&sig)) 683 DB_ERROR(("Missing signal number\n")); 684 if (!db_expression(&pid)) 685 DB_ERROR(("Missing process ID\n")); 686 db_skip_to_eol(); 687 if (!_SIG_VALID(sig)) 688 DB_ERROR(("Signal number out of range\n")); 689 690 /* 691 * Find the process in question. allproc_lock is not needed 692 * since we're in DDB. 693 */ 694 /* sx_slock(&allproc_lock); */ 695 FOREACH_PROC_IN_SYSTEM(p) 696 if (p->p_pid == pid) 697 break; 698 /* sx_sunlock(&allproc_lock); */ 699 if (p == NULL) 700 DB_ERROR(("Can't find process with pid %ld\n", (long) pid)); 701 702 /* If it's already locked, bail; otherwise, do the deed. */ 703 if (PROC_TRYLOCK(p) == 0) 704 DB_ERROR(("Can't lock process with pid %ld\n", (long) pid)); 705 else { 706 pksignal(p, sig, NULL); 707 PROC_UNLOCK(p); 708 } 709 710 out: 711 db_radix = old_radix; 712 #undef DB_ERROR 713 } 714 715 /* 716 * Reboot. In case there is an additional argument, take it as delay in 717 * seconds. Default to 15s if we cannot parse it and make sure we will 718 * never wait longer than 1 week. Some code is similar to 719 * kern_shutdown.c:shutdown_panic(). 720 */ 721 #ifndef DB_RESET_MAXDELAY 722 #define DB_RESET_MAXDELAY (3600 * 24 * 7) 723 #endif 724 725 static void 726 db_reset(db_expr_t addr, bool have_addr, db_expr_t count __unused, 727 char *modif __unused) 728 { 729 int delay, loop; 730 731 if (have_addr) { 732 delay = (int)db_hex2dec(addr); 733 734 /* If we parse to fail, use 15s. */ 735 if (delay == -1) 736 delay = 15; 737 738 /* Cap at one week. */ 739 if ((uintmax_t)delay > (uintmax_t)DB_RESET_MAXDELAY) 740 delay = DB_RESET_MAXDELAY; 741 742 db_printf("Automatic reboot in %d seconds - " 743 "press a key on the console to abort\n", delay); 744 for (loop = delay * 10; loop > 0; --loop) { 745 DELAY(1000 * 100); /* 1/10th second */ 746 /* Did user type a key? */ 747 if (cncheckc() != -1) 748 return; 749 } 750 } 751 752 cpu_reset(); 753 } 754 755 static void 756 db_watchdog(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 757 { 758 db_expr_t old_radix, tout; 759 int err, i; 760 761 old_radix = db_radix; 762 db_radix = 10; 763 err = db_expression(&tout); 764 db_skip_to_eol(); 765 db_radix = old_radix; 766 767 /* If no argument is provided the watchdog will just be disabled. */ 768 if (err == 0) { 769 db_printf("No argument provided, disabling watchdog\n"); 770 tout = 0; 771 } else if ((tout & WD_INTERVAL) == WD_TO_NEVER) { 772 db_error("Out of range watchdog interval\n"); 773 return; 774 } 775 EVENTHANDLER_INVOKE(watchdog_list, tout, &i); 776 } 777 778 static void 779 db_gdb(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 780 { 781 782 if (kdb_dbbe_select("gdb") != 0) { 783 db_printf("The remote GDB backend could not be selected.\n"); 784 return; 785 } 786 /* 787 * Mark that we are done in the debugger. kdb_trap() 788 * should re-enter with the new backend. 789 */ 790 db_cmd_loop_done = 1; 791 db_printf("(ctrl-c will return control to ddb)\n"); 792 } 793 794 static void 795 db_stack_trace(db_expr_t tid, bool hastid, db_expr_t count, char *modif) 796 { 797 struct thread *td; 798 db_expr_t radix; 799 pid_t pid; 800 int t; 801 802 /* 803 * We parse our own arguments. We don't like the default radix. 804 */ 805 radix = db_radix; 806 db_radix = 10; 807 hastid = db_expression(&tid); 808 t = db_read_token(); 809 if (t == tCOMMA) { 810 if (!db_expression(&count)) { 811 db_printf("Count missing\n"); 812 db_flush_lex(); 813 return; 814 } 815 } else { 816 db_unread_token(t); 817 count = -1; 818 } 819 db_skip_to_eol(); 820 db_radix = radix; 821 822 if (hastid) { 823 td = kdb_thr_lookup((lwpid_t)tid); 824 if (td == NULL) 825 td = kdb_thr_from_pid((pid_t)tid); 826 if (td == NULL) { 827 db_printf("Thread %d not found\n", (int)tid); 828 return; 829 } 830 } else 831 td = kdb_thread; 832 if (td->td_proc != NULL) 833 pid = td->td_proc->p_pid; 834 else 835 pid = -1; 836 db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td); 837 db_trace_thread(td, count); 838 } 839 840 static void 841 _db_stack_trace_all(bool active_only) 842 { 843 struct proc *p; 844 struct thread *td; 845 jmp_buf jb; 846 void *prev_jb; 847 848 FOREACH_PROC_IN_SYSTEM(p) { 849 prev_jb = kdb_jmpbuf(jb); 850 if (setjmp(jb) == 0) { 851 FOREACH_THREAD_IN_PROC(p, td) { 852 if (td->td_state == TDS_RUNNING) 853 db_printf("\nTracing command %s pid %d" 854 " tid %ld td %p (CPU %d)\n", 855 p->p_comm, p->p_pid, 856 (long)td->td_tid, td, 857 td->td_oncpu); 858 else if (active_only) 859 continue; 860 else 861 db_printf("\nTracing command %s pid %d" 862 " tid %ld td %p\n", p->p_comm, 863 p->p_pid, (long)td->td_tid, td); 864 db_trace_thread(td, -1); 865 if (db_pager_quit) { 866 kdb_jmpbuf(prev_jb); 867 return; 868 } 869 } 870 } 871 kdb_jmpbuf(prev_jb); 872 } 873 } 874 875 static void 876 db_stack_trace_active(db_expr_t dummy, bool dummy2, db_expr_t dummy3, 877 char *dummy4) 878 { 879 880 _db_stack_trace_all(true); 881 } 882 883 static void 884 db_stack_trace_all(db_expr_t dummy, bool dummy2, db_expr_t dummy3, 885 char *dummy4) 886 { 887 888 _db_stack_trace_all(false); 889 } 890 891 /* 892 * Take the parsed expression value from the command line that was parsed 893 * as a hexadecimal value and convert it as if the expression was parsed 894 * as a decimal value. Returns -1 if the expression was not a valid 895 * decimal value. 896 */ 897 db_expr_t 898 db_hex2dec(db_expr_t expr) 899 { 900 uintptr_t x, y; 901 db_expr_t val; 902 903 y = 1; 904 val = 0; 905 x = expr; 906 while (x != 0) { 907 if (x % 16 > 9) 908 return (-1); 909 val += (x % 16) * (y); 910 x >>= 4; 911 y *= 10; 912 } 913 return (val); 914 } 915