1 /*- 2 * SPDX-License-Identifier: MIT-CMU 3 * 4 * Mach Operating System 5 * Copyright (c) 1991,1990 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie the 26 * rights to redistribute these changes. 27 */ 28 /* 29 * Author: David B. Golub, Carnegie Mellon University 30 * Date: 7/90 31 */ 32 /* 33 * Command dispatcher. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/eventhandler.h> 41 #include <sys/linker_set.h> 42 #include <sys/lock.h> 43 #include <sys/kdb.h> 44 #include <sys/mutex.h> 45 #include <sys/proc.h> 46 #include <sys/reboot.h> 47 #include <sys/signalvar.h> 48 #include <sys/systm.h> 49 #include <sys/cons.h> 50 #include <sys/conf.h> 51 #include <sys/watchdog.h> 52 #include <sys/kernel.h> 53 54 #include <ddb/ddb.h> 55 #include <ddb/db_command.h> 56 #include <ddb/db_lex.h> 57 #include <ddb/db_output.h> 58 59 #include <machine/cpu.h> 60 #include <machine/setjmp.h> 61 62 /* 63 * Exported global variables 64 */ 65 int db_cmd_loop_done; 66 db_addr_t db_dot; 67 db_addr_t db_last_addr; 68 db_addr_t db_prev; 69 db_addr_t db_next; 70 71 static db_cmdfcn_t db_dump; 72 static db_cmdfcn_t db_fncall; 73 static db_cmdfcn_t db_gdb; 74 static db_cmdfcn_t db_halt; 75 static db_cmdfcn_t db_kill; 76 static db_cmdfcn_t db_reset; 77 static db_cmdfcn_t db_stack_trace; 78 static db_cmdfcn_t db_stack_trace_active; 79 static db_cmdfcn_t db_stack_trace_all; 80 static db_cmdfcn_t db_watchdog; 81 82 /* 83 * 'show' commands 84 */ 85 86 static struct command db_show_active_cmds[] = { 87 { "trace", db_stack_trace_active, 0, NULL }, 88 }; 89 struct command_table db_show_active_table = 90 LIST_HEAD_INITIALIZER(db_show_active_table); 91 92 static struct command db_show_all_cmds[] = { 93 { "trace", db_stack_trace_all, 0, NULL }, 94 }; 95 struct command_table db_show_all_table = 96 LIST_HEAD_INITIALIZER(db_show_all_table); 97 98 static struct command db_show_cmds[] = { 99 { "active", 0, 0, &db_show_active_table }, 100 { "all", 0, 0, &db_show_all_table }, 101 { "registers", db_show_regs, 0, NULL }, 102 { "breaks", db_listbreak_cmd, 0, NULL }, 103 { "threads", db_show_threads, 0, NULL }, 104 }; 105 struct command_table db_show_table = LIST_HEAD_INITIALIZER(db_show_table); 106 107 static struct command db_cmds[] = { 108 { "print", db_print_cmd, 0, NULL }, 109 { "p", db_print_cmd, 0, NULL }, 110 { "examine", db_examine_cmd, CS_SET_DOT, NULL }, 111 { "x", db_examine_cmd, CS_SET_DOT, NULL }, 112 { "search", db_search_cmd, CS_OWN|CS_SET_DOT, NULL }, 113 { "set", db_set_cmd, CS_OWN, NULL }, 114 { "write", db_write_cmd, CS_MORE|CS_SET_DOT, NULL }, 115 { "w", db_write_cmd, CS_MORE|CS_SET_DOT, NULL }, 116 { "delete", db_delete_cmd, 0, NULL }, 117 { "d", db_delete_cmd, 0, NULL }, 118 { "dump", db_dump, 0, NULL }, 119 { "break", db_breakpoint_cmd, 0, NULL }, 120 { "b", db_breakpoint_cmd, 0, NULL }, 121 { "dwatch", db_deletewatch_cmd, 0, NULL }, 122 { "watch", db_watchpoint_cmd, CS_MORE,NULL }, 123 { "dhwatch", db_deletehwatch_cmd, 0, NULL }, 124 { "hwatch", db_hwatchpoint_cmd, 0, NULL }, 125 { "step", db_single_step_cmd, 0, NULL }, 126 { "s", db_single_step_cmd, 0, NULL }, 127 { "continue", db_continue_cmd, 0, NULL }, 128 { "c", db_continue_cmd, 0, NULL }, 129 { "until", db_trace_until_call_cmd,0, NULL }, 130 { "next", db_trace_until_matching_cmd,0, NULL }, 131 { "match", db_trace_until_matching_cmd,0, NULL }, 132 { "trace", db_stack_trace, CS_OWN, NULL }, 133 { "t", db_stack_trace, CS_OWN, NULL }, 134 /* XXX alias for active trace */ 135 { "acttrace", db_stack_trace_active, 0, NULL }, 136 /* XXX alias for all trace */ 137 { "alltrace", db_stack_trace_all, 0, NULL }, 138 { "where", db_stack_trace, CS_OWN, NULL }, 139 { "bt", db_stack_trace, CS_OWN, NULL }, 140 { "call", db_fncall, CS_OWN, NULL }, 141 { "show", 0, 0, &db_show_table }, 142 { "ps", db_ps, 0, NULL }, 143 { "gdb", db_gdb, 0, NULL }, 144 { "halt", db_halt, 0, NULL }, 145 { "reboot", db_reset, 0, NULL }, 146 { "reset", db_reset, 0, NULL }, 147 { "kill", db_kill, CS_OWN, NULL }, 148 { "watchdog", db_watchdog, CS_OWN, NULL }, 149 { "thread", db_set_thread, 0, NULL }, 150 { "run", db_run_cmd, CS_OWN, NULL }, 151 { "script", db_script_cmd, CS_OWN, NULL }, 152 { "scripts", db_scripts_cmd, 0, NULL }, 153 { "unscript", db_unscript_cmd, CS_OWN, NULL }, 154 { "capture", db_capture_cmd, CS_OWN, NULL }, 155 { "textdump", db_textdump_cmd, CS_OWN, NULL }, 156 { "findstack", db_findstack_cmd, 0, NULL }, 157 }; 158 struct command_table db_cmd_table = LIST_HEAD_INITIALIZER(db_cmd_table); 159 160 static struct command *db_last_command = NULL; 161 162 /* 163 * if 'ed' style: 'dot' is set at start of last item printed, 164 * and '+' points to next line. 165 * Otherwise: 'dot' points to next item, '..' points to last. 166 */ 167 static bool db_ed_style = true; 168 169 /* 170 * Utility routine - discard tokens through end-of-line. 171 */ 172 void 173 db_skip_to_eol(void) 174 { 175 int t; 176 do { 177 t = db_read_token(); 178 } while (t != tEOL); 179 } 180 181 /* 182 * Results of command search. 183 */ 184 #define CMD_UNIQUE 0 185 #define CMD_FOUND 1 186 #define CMD_NONE 2 187 #define CMD_AMBIGUOUS 3 188 #define CMD_HELP 4 189 190 static void db_cmd_match(char *name, struct command *cmd, 191 struct command **cmdp, int *resultp); 192 static void db_cmd_list(struct command_table *table); 193 static int db_cmd_search(char *name, struct command_table *table, 194 struct command **cmdp); 195 static void db_command(struct command **last_cmdp, 196 struct command_table *cmd_table, int dopager); 197 198 /* 199 * Initialize the command lists from the static tables. 200 */ 201 void 202 db_command_init(void) 203 { 204 #define N(a) (sizeof(a) / sizeof(a[0])) 205 int i; 206 207 for (i = 0; i < N(db_cmds); i++) 208 db_command_register(&db_cmd_table, &db_cmds[i]); 209 for (i = 0; i < N(db_show_cmds); i++) 210 db_command_register(&db_show_table, &db_show_cmds[i]); 211 for (i = 0; i < N(db_show_active_cmds); i++) 212 db_command_register(&db_show_active_table, 213 &db_show_active_cmds[i]); 214 for (i = 0; i < N(db_show_all_cmds); i++) 215 db_command_register(&db_show_all_table, &db_show_all_cmds[i]); 216 #undef N 217 } 218 219 /* 220 * Register a command. 221 */ 222 void 223 db_command_register(struct command_table *list, struct command *cmd) 224 { 225 struct command *c, *last; 226 227 last = NULL; 228 LIST_FOREACH(c, list, next) { 229 int n = strcmp(cmd->name, c->name); 230 231 /* Check that the command is not already present. */ 232 if (n == 0) { 233 printf("%s: Warning, the command \"%s\" already exists;" 234 " ignoring request\n", __func__, cmd->name); 235 return; 236 } 237 if (n < 0) { 238 /* NB: keep list sorted lexicographically */ 239 LIST_INSERT_BEFORE(c, cmd, next); 240 return; 241 } 242 last = c; 243 } 244 if (last == NULL) 245 LIST_INSERT_HEAD(list, cmd, next); 246 else 247 LIST_INSERT_AFTER(last, cmd, next); 248 } 249 250 /* 251 * Remove a command previously registered with db_command_register. 252 */ 253 void 254 db_command_unregister(struct command_table *list, struct command *cmd) 255 { 256 struct command *c; 257 258 LIST_FOREACH(c, list, next) { 259 if (cmd == c) { 260 LIST_REMOVE(cmd, next); 261 return; 262 } 263 } 264 /* NB: intentionally quiet */ 265 } 266 267 /* 268 * Helper function to match a single command. 269 */ 270 static void 271 db_cmd_match(char *name, struct command *cmd, struct command **cmdp, 272 int *resultp) 273 { 274 char *lp, *rp; 275 int c; 276 277 lp = name; 278 rp = cmd->name; 279 while ((c = *lp) == *rp) { 280 if (c == 0) { 281 /* complete match */ 282 *cmdp = cmd; 283 *resultp = CMD_UNIQUE; 284 return; 285 } 286 lp++; 287 rp++; 288 } 289 if (c == 0) { 290 /* end of name, not end of command - 291 partial match */ 292 if (*resultp == CMD_FOUND) { 293 *resultp = CMD_AMBIGUOUS; 294 /* but keep looking for a full match - 295 this lets us match single letters */ 296 } else if (*resultp == CMD_NONE) { 297 *cmdp = cmd; 298 *resultp = CMD_FOUND; 299 } 300 } 301 } 302 303 /* 304 * Search for command prefix. 305 */ 306 static int 307 db_cmd_search(char *name, struct command_table *table, struct command **cmdp) 308 { 309 struct command *cmd; 310 int result = CMD_NONE; 311 312 LIST_FOREACH(cmd, table, next) { 313 db_cmd_match(name,cmd,cmdp,&result); 314 if (result == CMD_UNIQUE) 315 break; 316 } 317 318 if (result == CMD_NONE) { 319 /* check for 'help' */ 320 if (name[0] == 'h' && name[1] == 'e' 321 && name[2] == 'l' && name[3] == 'p') 322 result = CMD_HELP; 323 } 324 return (result); 325 } 326 327 static void 328 db_cmd_list(struct command_table *table) 329 { 330 struct command *cmd; 331 int have_subcommands; 332 333 have_subcommands = 0; 334 LIST_FOREACH(cmd, table, next) { 335 if (cmd->more != NULL) 336 have_subcommands++; 337 db_printf("%-16s", cmd->name); 338 db_end_line(16); 339 } 340 341 if (have_subcommands > 0) { 342 db_printf("\nThe following have subcommands; append \"help\" " 343 "to list (e.g. \"show help\"):\n"); 344 LIST_FOREACH(cmd, table, next) { 345 if (cmd->more == NULL) 346 continue; 347 db_printf("%-16s", cmd->name); 348 db_end_line(16); 349 } 350 } 351 } 352 353 static void 354 db_command(struct command **last_cmdp, struct command_table *cmd_table, 355 int dopager) 356 { 357 struct command *cmd = NULL; 358 int t; 359 char modif[TOK_STRING_SIZE]; 360 db_expr_t addr, count; 361 bool have_addr = false; 362 int result; 363 364 t = db_read_token(); 365 if (t == tEOL) { 366 /* empty line repeats last command, at 'next' */ 367 cmd = *last_cmdp; 368 addr = (db_expr_t)db_next; 369 have_addr = false; 370 count = 1; 371 modif[0] = '\0'; 372 } 373 else if (t == tEXCL) { 374 db_fncall((db_expr_t)0, (bool)false, (db_expr_t)0, (char *)0); 375 return; 376 } 377 else if (t != tIDENT) { 378 db_printf("Unrecognized input; use \"help\" " 379 "to list available commands\n"); 380 db_flush_lex(); 381 return; 382 } 383 else { 384 /* 385 * Search for command 386 */ 387 while (cmd_table) { 388 result = db_cmd_search(db_tok_string, 389 cmd_table, 390 &cmd); 391 switch (result) { 392 case CMD_NONE: 393 db_printf("No such command; use \"help\" " 394 "to list available commands\n"); 395 db_flush_lex(); 396 return; 397 case CMD_AMBIGUOUS: 398 db_printf("Ambiguous\n"); 399 db_flush_lex(); 400 return; 401 case CMD_HELP: 402 if (cmd_table == &db_cmd_table) { 403 db_printf("This is ddb(4), the kernel debugger; " 404 "see https://man.FreeBSD.org/ddb/4 for help.\n"); 405 db_printf("Use \"bt\" for backtrace, \"dump\" for " 406 "kernel core dump, \"reset\" to reboot.\n"); 407 db_printf("Available commands:\n"); 408 } 409 db_cmd_list(cmd_table); 410 db_flush_lex(); 411 return; 412 default: 413 break; 414 } 415 if ((cmd_table = cmd->more) != NULL) { 416 t = db_read_token(); 417 if (t != tIDENT) { 418 db_printf("Subcommand required; " 419 "available subcommands:\n"); 420 db_cmd_list(cmd_table); 421 db_flush_lex(); 422 return; 423 } 424 } 425 } 426 427 if ((cmd->flag & CS_OWN) == 0) { 428 /* 429 * Standard syntax: 430 * command [/modifier] [addr] [,count] 431 */ 432 t = db_read_token(); 433 if (t == tSLASH) { 434 t = db_read_token(); 435 if (t != tIDENT) { 436 db_printf("Bad modifier\n"); 437 db_flush_lex(); 438 return; 439 } 440 db_strcpy(modif, db_tok_string); 441 } 442 else { 443 db_unread_token(t); 444 modif[0] = '\0'; 445 } 446 447 if (db_expression(&addr)) { 448 db_dot = (db_addr_t) addr; 449 db_last_addr = db_dot; 450 have_addr = true; 451 } 452 else { 453 addr = (db_expr_t) db_dot; 454 have_addr = false; 455 } 456 t = db_read_token(); 457 if (t == tCOMMA) { 458 if (!db_expression(&count)) { 459 db_printf("Count missing\n"); 460 db_flush_lex(); 461 return; 462 } 463 } 464 else { 465 db_unread_token(t); 466 count = -1; 467 } 468 if ((cmd->flag & CS_MORE) == 0) { 469 db_skip_to_eol(); 470 } 471 } 472 } 473 *last_cmdp = cmd; 474 if (cmd != NULL) { 475 /* 476 * Execute the command. 477 */ 478 if (dopager) 479 db_enable_pager(); 480 else 481 db_disable_pager(); 482 (*cmd->fcn)(addr, have_addr, count, modif); 483 if (dopager) 484 db_disable_pager(); 485 486 if (cmd->flag & CS_SET_DOT) { 487 /* 488 * If command changes dot, set dot to 489 * previous address displayed (if 'ed' style). 490 */ 491 if (db_ed_style) { 492 db_dot = db_prev; 493 } 494 else { 495 db_dot = db_next; 496 } 497 } 498 else { 499 /* 500 * If command does not change dot, 501 * set 'next' location to be the same. 502 */ 503 db_next = db_dot; 504 } 505 } 506 } 507 508 /* 509 * At least one non-optional command must be implemented using 510 * DB_COMMAND() so that db_cmd_set gets created. Here is one. 511 */ 512 DB_COMMAND(panic, db_panic) 513 { 514 db_disable_pager(); 515 panic("from debugger"); 516 } 517 518 void 519 db_command_loop(void) 520 { 521 /* 522 * Initialize 'prev' and 'next' to dot. 523 */ 524 db_prev = db_dot; 525 db_next = db_dot; 526 527 db_cmd_loop_done = 0; 528 while (!db_cmd_loop_done) { 529 if (db_print_position() != 0) 530 db_printf("\n"); 531 532 db_printf("db> "); 533 (void) db_read_line(); 534 535 db_command(&db_last_command, &db_cmd_table, /* dopager */ 1); 536 } 537 } 538 539 /* 540 * Execute a command on behalf of a script. The caller is responsible for 541 * making sure that the command string is < DB_MAXLINE or it will be 542 * truncated. 543 * 544 * XXXRW: Runs by injecting faked input into DDB input stream; it would be 545 * nicer to use an alternative approach that didn't mess with the previous 546 * command buffer. 547 */ 548 void 549 db_command_script(const char *command) 550 { 551 db_prev = db_next = db_dot; 552 db_inject_line(command); 553 db_command(&db_last_command, &db_cmd_table, /* dopager */ 0); 554 } 555 556 void 557 db_error(const char *s) 558 { 559 if (s) 560 db_printf("%s", s); 561 db_flush_lex(); 562 kdb_reenter_silent(); 563 } 564 565 static void 566 db_dump(db_expr_t dummy, bool dummy2, db_expr_t dummy3, char *dummy4) 567 { 568 int error; 569 570 if (textdump_pending) { 571 db_printf("textdump_pending set.\n" 572 "run \"textdump unset\" first or \"textdump dump\" for a textdump.\n"); 573 return; 574 } 575 error = doadump(false); 576 if (error) { 577 db_printf("Cannot dump: "); 578 switch (error) { 579 case EBUSY: 580 db_printf("debugger got invoked while dumping.\n"); 581 break; 582 case ENXIO: 583 db_printf("no dump device specified.\n"); 584 break; 585 default: 586 db_printf("unknown error (error=%d).\n", error); 587 break; 588 } 589 } 590 } 591 592 /* 593 * Call random function: 594 * !expr(arg,arg,arg) 595 */ 596 597 /* The generic implementation supports a maximum of 10 arguments. */ 598 typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t, 599 db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t); 600 601 static __inline int 602 db_fncall_generic(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[]) 603 { 604 __db_f *f = (__db_f *)addr; 605 606 if (nargs > 10) { 607 db_printf("Too many arguments (max 10)\n"); 608 return (0); 609 } 610 *rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5], 611 args[6], args[7], args[8], args[9]); 612 return (1); 613 } 614 615 static void 616 db_fncall(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 617 { 618 db_expr_t fn_addr; 619 db_expr_t args[DB_MAXARGS]; 620 int nargs = 0; 621 db_expr_t retval; 622 int t; 623 624 if (!db_expression(&fn_addr)) { 625 db_printf("Bad function\n"); 626 db_flush_lex(); 627 return; 628 } 629 630 t = db_read_token(); 631 if (t == tLPAREN) { 632 if (db_expression(&args[0])) { 633 nargs++; 634 while ((t = db_read_token()) == tCOMMA) { 635 if (nargs == DB_MAXARGS) { 636 db_printf("Too many arguments (max %d)\n", DB_MAXARGS); 637 db_flush_lex(); 638 return; 639 } 640 if (!db_expression(&args[nargs])) { 641 db_printf("Argument missing\n"); 642 db_flush_lex(); 643 return; 644 } 645 nargs++; 646 } 647 db_unread_token(t); 648 } 649 if (db_read_token() != tRPAREN) { 650 db_printf("Mismatched parens\n"); 651 db_flush_lex(); 652 return; 653 } 654 } 655 db_skip_to_eol(); 656 db_disable_pager(); 657 658 if (DB_CALL(fn_addr, &retval, nargs, args)) 659 db_printf("= %#lr\n", (long)retval); 660 } 661 662 static void 663 db_halt(db_expr_t dummy, bool dummy2, db_expr_t dummy3, char *dummy4) 664 { 665 666 cpu_halt(); 667 } 668 669 static void 670 db_kill(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 671 { 672 db_expr_t old_radix, pid, sig; 673 struct proc *p; 674 675 #define DB_ERROR(f) do { db_printf f; db_flush_lex(); goto out; } while (0) 676 677 /* 678 * PIDs and signal numbers are typically represented in base 679 * 10, so make that the default here. It can, of course, be 680 * overridden by specifying a prefix. 681 */ 682 old_radix = db_radix; 683 db_radix = 10; 684 /* Retrieve arguments. */ 685 if (!db_expression(&sig)) 686 DB_ERROR(("Missing signal number\n")); 687 if (!db_expression(&pid)) 688 DB_ERROR(("Missing process ID\n")); 689 db_skip_to_eol(); 690 if (!_SIG_VALID(sig)) 691 DB_ERROR(("Signal number out of range\n")); 692 693 /* 694 * Find the process in question. allproc_lock is not needed 695 * since we're in DDB. 696 */ 697 /* sx_slock(&allproc_lock); */ 698 FOREACH_PROC_IN_SYSTEM(p) 699 if (p->p_pid == pid) 700 break; 701 /* sx_sunlock(&allproc_lock); */ 702 if (p == NULL) 703 DB_ERROR(("Can't find process with pid %ld\n", (long) pid)); 704 705 /* If it's already locked, bail; otherwise, do the deed. */ 706 if (PROC_TRYLOCK(p) == 0) 707 DB_ERROR(("Can't lock process with pid %ld\n", (long) pid)); 708 else { 709 pksignal(p, sig, NULL); 710 PROC_UNLOCK(p); 711 } 712 713 out: 714 db_radix = old_radix; 715 #undef DB_ERROR 716 } 717 718 /* 719 * Reboot. In case there is an additional argument, take it as delay in 720 * seconds. Default to 15s if we cannot parse it and make sure we will 721 * never wait longer than 1 week. Some code is similar to 722 * kern_shutdown.c:shutdown_panic(). 723 */ 724 #ifndef DB_RESET_MAXDELAY 725 #define DB_RESET_MAXDELAY (3600 * 24 * 7) 726 #endif 727 728 static void 729 db_reset(db_expr_t addr, bool have_addr, db_expr_t count __unused, 730 char *modif __unused) 731 { 732 int delay, loop; 733 734 if (have_addr) { 735 delay = (int)db_hex2dec(addr); 736 737 /* If we parse to fail, use 15s. */ 738 if (delay == -1) 739 delay = 15; 740 741 /* Cap at one week. */ 742 if ((uintmax_t)delay > (uintmax_t)DB_RESET_MAXDELAY) 743 delay = DB_RESET_MAXDELAY; 744 745 db_printf("Automatic reboot in %d seconds - " 746 "press a key on the console to abort\n", delay); 747 for (loop = delay * 10; loop > 0; --loop) { 748 DELAY(1000 * 100); /* 1/10th second */ 749 /* Did user type a key? */ 750 if (cncheckc() != -1) 751 return; 752 } 753 } 754 755 cpu_reset(); 756 } 757 758 static void 759 db_watchdog(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 760 { 761 db_expr_t old_radix, tout; 762 int err, i; 763 764 old_radix = db_radix; 765 db_radix = 10; 766 err = db_expression(&tout); 767 db_skip_to_eol(); 768 db_radix = old_radix; 769 770 /* If no argument is provided the watchdog will just be disabled. */ 771 if (err == 0) { 772 db_printf("No argument provided, disabling watchdog\n"); 773 tout = 0; 774 } else if ((tout & WD_INTERVAL) == WD_TO_NEVER) { 775 db_error("Out of range watchdog interval\n"); 776 return; 777 } 778 EVENTHANDLER_INVOKE(watchdog_list, tout, &i); 779 } 780 781 static void 782 db_gdb(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 783 { 784 785 if (kdb_dbbe_select("gdb") != 0) { 786 db_printf("The remote GDB backend could not be selected.\n"); 787 return; 788 } 789 /* 790 * Mark that we are done in the debugger. kdb_trap() 791 * should re-enter with the new backend. 792 */ 793 db_cmd_loop_done = 1; 794 db_printf("(ctrl-c will return control to ddb)\n"); 795 } 796 797 static void 798 db_stack_trace(db_expr_t tid, bool hastid, db_expr_t count, char *modif) 799 { 800 struct thread *td; 801 db_expr_t radix; 802 pid_t pid; 803 int t; 804 805 /* 806 * We parse our own arguments. We don't like the default radix. 807 */ 808 radix = db_radix; 809 db_radix = 10; 810 hastid = db_expression(&tid); 811 t = db_read_token(); 812 if (t == tCOMMA) { 813 if (!db_expression(&count)) { 814 db_printf("Count missing\n"); 815 db_flush_lex(); 816 db_radix = radix; 817 return; 818 } 819 } else { 820 db_unread_token(t); 821 count = -1; 822 } 823 db_skip_to_eol(); 824 db_radix = radix; 825 826 if (hastid) { 827 td = kdb_thr_lookup((lwpid_t)tid); 828 if (td == NULL) 829 td = kdb_thr_from_pid((pid_t)tid); 830 if (td == NULL) { 831 db_printf("Thread %d not found\n", (int)tid); 832 return; 833 } 834 } else 835 td = kdb_thread; 836 if (td->td_proc != NULL) 837 pid = td->td_proc->p_pid; 838 else 839 pid = -1; 840 db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td); 841 if (td->td_proc != NULL && (td->td_proc->p_flag & P_INMEM) == 0) 842 db_printf("--- swapped out\n"); 843 else 844 db_trace_thread(td, count); 845 } 846 847 static void 848 _db_stack_trace_all(bool active_only) 849 { 850 struct thread *td; 851 jmp_buf jb; 852 void *prev_jb; 853 854 for (td = kdb_thr_first(); td != NULL; td = kdb_thr_next(td)) { 855 prev_jb = kdb_jmpbuf(jb); 856 if (setjmp(jb) == 0) { 857 if (TD_IS_RUNNING(td)) 858 db_printf("\nTracing command %s pid %d" 859 " tid %ld td %p (CPU %d)\n", 860 td->td_proc->p_comm, td->td_proc->p_pid, 861 (long)td->td_tid, td, td->td_oncpu); 862 else if (active_only) 863 continue; 864 else 865 db_printf("\nTracing command %s pid %d" 866 " tid %ld td %p\n", td->td_proc->p_comm, 867 td->td_proc->p_pid, (long)td->td_tid, td); 868 if (td->td_proc->p_flag & P_INMEM) 869 db_trace_thread(td, -1); 870 else 871 db_printf("--- swapped out\n"); 872 if (db_pager_quit) { 873 kdb_jmpbuf(prev_jb); 874 return; 875 } 876 } 877 kdb_jmpbuf(prev_jb); 878 } 879 } 880 881 static void 882 db_stack_trace_active(db_expr_t dummy, bool dummy2, db_expr_t dummy3, 883 char *dummy4) 884 { 885 886 _db_stack_trace_all(true); 887 } 888 889 static void 890 db_stack_trace_all(db_expr_t dummy, bool dummy2, db_expr_t dummy3, 891 char *dummy4) 892 { 893 894 _db_stack_trace_all(false); 895 } 896 897 /* 898 * Take the parsed expression value from the command line that was parsed 899 * as a hexadecimal value and convert it as if the expression was parsed 900 * as a decimal value. Returns -1 if the expression was not a valid 901 * decimal value. 902 */ 903 db_expr_t 904 db_hex2dec(db_expr_t expr) 905 { 906 uintptr_t x, y; 907 db_expr_t val; 908 909 y = 1; 910 val = 0; 911 x = expr; 912 while (x != 0) { 913 if (x % 16 > 9) 914 return (-1); 915 val += (x % 16) * (y); 916 x >>= 4; 917 y *= 10; 918 } 919 return (val); 920 } 921