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 db_command db_show_active_cmds[] = { 87 { "trace", db_stack_trace_active, 0, NULL }, 88 }; 89 struct db_command_table db_show_active_table = 90 LIST_HEAD_INITIALIZER(db_show_active_table); 91 92 static struct db_command db_show_all_cmds[] = { 93 { "trace", db_stack_trace_all, 0, NULL }, 94 }; 95 struct db_command_table db_show_all_table = 96 LIST_HEAD_INITIALIZER(db_show_all_table); 97 98 static struct db_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 db_command_table db_show_table = LIST_HEAD_INITIALIZER(db_show_table); 106 107 static struct db_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 db_command_table db_cmd_table = LIST_HEAD_INITIALIZER(db_cmd_table); 159 160 static struct db_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 db_command *cmd, 191 struct db_command **cmdp, int *resultp); 192 static void db_cmd_list(struct db_command_table *table); 193 static int db_cmd_search(char *name, struct db_command_table *table, 194 struct db_command **cmdp); 195 static void db_command(struct db_command **last_cmdp, 196 struct db_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 db_command_table *list, struct db_command *cmd) 224 { 225 struct db_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 db_command_table *list, struct db_command *cmd) 255 { 256 struct db_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 db_command *cmd, struct db_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 db_command_table *table, 308 struct db_command **cmdp) 309 { 310 struct db_command *cmd; 311 int result = CMD_NONE; 312 313 LIST_FOREACH(cmd, table, next) { 314 db_cmd_match(name,cmd,cmdp,&result); 315 if (result == CMD_UNIQUE) 316 break; 317 } 318 319 if (result == CMD_NONE) { 320 /* check for 'help' */ 321 if (name[0] == 'h' && name[1] == 'e' 322 && name[2] == 'l' && name[3] == 'p') 323 result = CMD_HELP; 324 } 325 return (result); 326 } 327 328 static void 329 db_cmd_list(struct db_command_table *table) 330 { 331 struct db_command *cmd; 332 int have_subcommands; 333 334 have_subcommands = 0; 335 LIST_FOREACH(cmd, table, next) { 336 if (cmd->more != NULL) 337 have_subcommands++; 338 db_printf("%-16s", cmd->name); 339 db_end_line(16); 340 } 341 342 if (have_subcommands > 0) { 343 db_printf("\nThe following have subcommands; append \"help\" " 344 "to list (e.g. \"show help\"):\n"); 345 LIST_FOREACH(cmd, table, next) { 346 if (cmd->more == NULL) 347 continue; 348 db_printf("%-16s", cmd->name); 349 db_end_line(16); 350 } 351 } 352 } 353 354 static void 355 db_command(struct db_command **last_cmdp, struct db_command_table *cmd_table, 356 int dopager) 357 { 358 struct db_command *cmd = NULL; 359 int t; 360 char modif[TOK_STRING_SIZE]; 361 db_expr_t addr, count; 362 bool have_addr = false; 363 int result; 364 365 t = db_read_token(); 366 if (t == tEOL) { 367 /* empty line repeats last command, at 'next' */ 368 cmd = *last_cmdp; 369 addr = (db_expr_t)db_next; 370 have_addr = false; 371 count = 1; 372 modif[0] = '\0'; 373 } 374 else if (t == tEXCL) { 375 db_fncall((db_expr_t)0, (bool)false, (db_expr_t)0, (char *)0); 376 return; 377 } 378 else if (t != tIDENT) { 379 db_printf("Unrecognized input; use \"help\" " 380 "to list available commands\n"); 381 db_flush_lex(); 382 return; 383 } 384 else { 385 /* 386 * Search for command 387 */ 388 while (cmd_table) { 389 result = db_cmd_search(db_tok_string, 390 cmd_table, 391 &cmd); 392 switch (result) { 393 case CMD_NONE: 394 db_printf("No such command; use \"help\" " 395 "to list available commands\n"); 396 db_flush_lex(); 397 return; 398 case CMD_AMBIGUOUS: 399 db_printf("Ambiguous\n"); 400 db_flush_lex(); 401 return; 402 case CMD_HELP: 403 if (cmd_table == &db_cmd_table) { 404 db_printf("This is ddb(4), the kernel debugger; " 405 "see https://man.FreeBSD.org/ddb/4 for help.\n"); 406 db_printf("Use \"bt\" for backtrace, \"dump\" for " 407 "kernel core dump, \"reset\" to reboot.\n"); 408 db_printf("Available commands:\n"); 409 } 410 db_cmd_list(cmd_table); 411 db_flush_lex(); 412 return; 413 default: 414 break; 415 } 416 if ((cmd_table = cmd->more) != NULL) { 417 t = db_read_token(); 418 if (t != tIDENT) { 419 db_printf("Subcommand required; " 420 "available subcommands:\n"); 421 db_cmd_list(cmd_table); 422 db_flush_lex(); 423 return; 424 } 425 } 426 } 427 428 if ((cmd->flag & CS_OWN) == 0) { 429 /* 430 * Standard syntax: 431 * command [/modifier] [addr] [,count] 432 */ 433 t = db_read_token(); 434 if (t == tSLASH) { 435 t = db_read_token(); 436 if (t != tIDENT) { 437 db_printf("Bad modifier\n"); 438 db_flush_lex(); 439 return; 440 } 441 db_strcpy(modif, db_tok_string); 442 } 443 else { 444 db_unread_token(t); 445 modif[0] = '\0'; 446 } 447 448 if (db_expression(&addr)) { 449 db_dot = (db_addr_t) addr; 450 db_last_addr = db_dot; 451 have_addr = true; 452 } 453 else { 454 addr = (db_expr_t) db_dot; 455 have_addr = false; 456 } 457 t = db_read_token(); 458 if (t == tCOMMA) { 459 if (!db_expression(&count)) { 460 db_printf("Count missing\n"); 461 db_flush_lex(); 462 return; 463 } 464 } 465 else { 466 db_unread_token(t); 467 count = -1; 468 } 469 if ((cmd->flag & CS_MORE) == 0) { 470 db_skip_to_eol(); 471 } 472 } 473 } 474 *last_cmdp = cmd; 475 if (cmd != NULL) { 476 /* 477 * Execute the command. 478 */ 479 if (dopager) 480 db_enable_pager(); 481 else 482 db_disable_pager(); 483 (*cmd->fcn)(addr, have_addr, count, modif); 484 if (dopager) 485 db_disable_pager(); 486 487 if (cmd->flag & CS_SET_DOT) { 488 /* 489 * If command changes dot, set dot to 490 * previous address displayed (if 'ed' style). 491 */ 492 if (db_ed_style) { 493 db_dot = db_prev; 494 } 495 else { 496 db_dot = db_next; 497 } 498 } 499 else { 500 /* 501 * If command does not change dot, 502 * set 'next' location to be the same. 503 */ 504 db_next = db_dot; 505 } 506 } 507 } 508 509 /* 510 * At least one non-optional command must be implemented using 511 * DB_COMMAND() so that db_cmd_set gets created. Here is one. 512 */ 513 DB_COMMAND(panic, db_panic) 514 { 515 db_disable_pager(); 516 panic("from debugger"); 517 } 518 519 void 520 db_command_loop(void) 521 { 522 /* 523 * Initialize 'prev' and 'next' to dot. 524 */ 525 db_prev = db_dot; 526 db_next = db_dot; 527 528 db_cmd_loop_done = 0; 529 while (!db_cmd_loop_done) { 530 if (db_print_position() != 0) 531 db_printf("\n"); 532 533 db_printf("db> "); 534 (void) db_read_line(); 535 536 db_command(&db_last_command, &db_cmd_table, /* dopager */ 1); 537 } 538 } 539 540 /* 541 * Execute a command on behalf of a script. The caller is responsible for 542 * making sure that the command string is < DB_MAXLINE or it will be 543 * truncated. 544 * 545 * XXXRW: Runs by injecting faked input into DDB input stream; it would be 546 * nicer to use an alternative approach that didn't mess with the previous 547 * command buffer. 548 */ 549 void 550 db_command_script(const char *command) 551 { 552 db_prev = db_next = db_dot; 553 db_inject_line(command); 554 db_command(&db_last_command, &db_cmd_table, /* dopager */ 0); 555 } 556 557 void 558 db_error(const char *s) 559 { 560 if (s) 561 db_printf("%s", s); 562 db_flush_lex(); 563 kdb_reenter_silent(); 564 } 565 566 static void 567 db_dump(db_expr_t dummy, bool dummy2, db_expr_t dummy3, char *dummy4) 568 { 569 int error; 570 571 if (textdump_pending) { 572 db_printf("textdump_pending set.\n" 573 "run \"textdump unset\" first or \"textdump dump\" for a textdump.\n"); 574 return; 575 } 576 error = doadump(false); 577 if (error) { 578 db_printf("Cannot dump: "); 579 switch (error) { 580 case EBUSY: 581 db_printf("debugger got invoked while dumping.\n"); 582 break; 583 case ENXIO: 584 db_printf("no dump device specified.\n"); 585 break; 586 default: 587 db_printf("unknown error (error=%d).\n", error); 588 break; 589 } 590 } 591 } 592 593 /* 594 * Call random function: 595 * !expr(arg,arg,arg) 596 */ 597 598 /* The generic implementation supports a maximum of 10 arguments. */ 599 typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t, 600 db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t); 601 602 static __inline int 603 db_fncall_generic(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[]) 604 { 605 __db_f *f = (__db_f *)addr; 606 607 if (nargs > 10) { 608 db_printf("Too many arguments (max 10)\n"); 609 return (0); 610 } 611 *rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5], 612 args[6], args[7], args[8], args[9]); 613 return (1); 614 } 615 616 static void 617 db_fncall(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 618 { 619 db_expr_t fn_addr; 620 db_expr_t args[DB_MAXARGS]; 621 int nargs = 0; 622 db_expr_t retval; 623 int t; 624 625 if (!db_expression(&fn_addr)) { 626 db_printf("Bad function\n"); 627 db_flush_lex(); 628 return; 629 } 630 631 t = db_read_token(); 632 if (t == tLPAREN) { 633 if (db_expression(&args[0])) { 634 nargs++; 635 while ((t = db_read_token()) == tCOMMA) { 636 if (nargs == DB_MAXARGS) { 637 db_printf("Too many arguments (max %d)\n", DB_MAXARGS); 638 db_flush_lex(); 639 return; 640 } 641 if (!db_expression(&args[nargs])) { 642 db_printf("Argument missing\n"); 643 db_flush_lex(); 644 return; 645 } 646 nargs++; 647 } 648 db_unread_token(t); 649 } 650 if (db_read_token() != tRPAREN) { 651 db_printf("Mismatched parens\n"); 652 db_flush_lex(); 653 return; 654 } 655 } 656 db_skip_to_eol(); 657 db_disable_pager(); 658 659 if (DB_CALL(fn_addr, &retval, nargs, args)) 660 db_printf("= %#lr\n", (long)retval); 661 } 662 663 static void 664 db_halt(db_expr_t dummy, bool dummy2, db_expr_t dummy3, char *dummy4) 665 { 666 667 cpu_halt(); 668 } 669 670 static void 671 db_kill(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 672 { 673 db_expr_t old_radix, pid, sig; 674 struct proc *p; 675 676 #define DB_ERROR(f) do { db_printf f; db_flush_lex(); goto out; } while (0) 677 678 /* 679 * PIDs and signal numbers are typically represented in base 680 * 10, so make that the default here. It can, of course, be 681 * overridden by specifying a prefix. 682 */ 683 old_radix = db_radix; 684 db_radix = 10; 685 /* Retrieve arguments. */ 686 if (!db_expression(&sig)) 687 DB_ERROR(("Missing signal number\n")); 688 if (!db_expression(&pid)) 689 DB_ERROR(("Missing process ID\n")); 690 db_skip_to_eol(); 691 if (!_SIG_VALID(sig)) 692 DB_ERROR(("Signal number out of range\n")); 693 694 /* 695 * Find the process in question. allproc_lock is not needed 696 * since we're in DDB. 697 */ 698 /* sx_slock(&allproc_lock); */ 699 FOREACH_PROC_IN_SYSTEM(p) 700 if (p->p_pid == pid) 701 break; 702 /* sx_sunlock(&allproc_lock); */ 703 if (p == NULL) 704 DB_ERROR(("Can't find process with pid %ld\n", (long) pid)); 705 706 /* If it's already locked, bail; otherwise, do the deed. */ 707 if (PROC_TRYLOCK(p) == 0) 708 DB_ERROR(("Can't lock process with pid %ld\n", (long) pid)); 709 else { 710 pksignal(p, sig, NULL); 711 PROC_UNLOCK(p); 712 } 713 714 out: 715 db_radix = old_radix; 716 #undef DB_ERROR 717 } 718 719 /* 720 * Reboot. In case there is an additional argument, take it as delay in 721 * seconds. Default to 15s if we cannot parse it and make sure we will 722 * never wait longer than 1 week. Some code is similar to 723 * kern_shutdown.c:shutdown_panic(). 724 */ 725 #ifndef DB_RESET_MAXDELAY 726 #define DB_RESET_MAXDELAY (3600 * 24 * 7) 727 #endif 728 729 static void 730 db_reset(db_expr_t addr, bool have_addr, db_expr_t count __unused, 731 char *modif __unused) 732 { 733 int delay, loop; 734 735 if (have_addr) { 736 delay = (int)db_hex2dec(addr); 737 738 /* If we parse to fail, use 15s. */ 739 if (delay == -1) 740 delay = 15; 741 742 /* Cap at one week. */ 743 if ((uintmax_t)delay > (uintmax_t)DB_RESET_MAXDELAY) 744 delay = DB_RESET_MAXDELAY; 745 746 db_printf("Automatic reboot in %d seconds - " 747 "press a key on the console to abort\n", delay); 748 for (loop = delay * 10; loop > 0; --loop) { 749 DELAY(1000 * 100); /* 1/10th second */ 750 /* Did user type a key? */ 751 if (cncheckc() != -1) 752 return; 753 } 754 } 755 756 cpu_reset(); 757 } 758 759 static void 760 db_watchdog(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 761 { 762 db_expr_t old_radix, tout; 763 int err, i; 764 765 old_radix = db_radix; 766 db_radix = 10; 767 err = db_expression(&tout); 768 db_skip_to_eol(); 769 db_radix = old_radix; 770 771 /* If no argument is provided the watchdog will just be disabled. */ 772 if (err == 0) { 773 db_printf("No argument provided, disabling watchdog\n"); 774 tout = 0; 775 } else if ((tout & WD_INTERVAL) == WD_TO_NEVER) { 776 db_error("Out of range watchdog interval\n"); 777 return; 778 } 779 EVENTHANDLER_INVOKE(watchdog_list, tout, &i); 780 } 781 782 static void 783 db_gdb(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 784 { 785 786 if (kdb_dbbe_select("gdb") != 0) { 787 db_printf("The remote GDB backend could not be selected.\n"); 788 return; 789 } 790 /* 791 * Mark that we are done in the debugger. kdb_trap() 792 * should re-enter with the new backend. 793 */ 794 db_cmd_loop_done = 1; 795 db_printf("(ctrl-c will return control to ddb)\n"); 796 } 797 798 static void 799 db_stack_trace(db_expr_t tid, bool hastid, db_expr_t count, char *modif) 800 { 801 struct thread *td; 802 db_expr_t radix; 803 pid_t pid; 804 int t; 805 806 /* 807 * We parse our own arguments. We don't like the default radix. 808 */ 809 radix = db_radix; 810 db_radix = 10; 811 hastid = db_expression(&tid); 812 t = db_read_token(); 813 if (t == tCOMMA) { 814 if (!db_expression(&count)) { 815 db_printf("Count missing\n"); 816 db_flush_lex(); 817 db_radix = radix; 818 return; 819 } 820 } else { 821 db_unread_token(t); 822 count = -1; 823 } 824 db_skip_to_eol(); 825 db_radix = radix; 826 827 if (hastid) { 828 td = kdb_thr_lookup((lwpid_t)tid); 829 if (td == NULL) 830 td = kdb_thr_from_pid((pid_t)tid); 831 if (td == NULL) { 832 db_printf("Thread %d not found\n", (int)tid); 833 return; 834 } 835 } else 836 td = kdb_thread; 837 if (td->td_proc != NULL) 838 pid = td->td_proc->p_pid; 839 else 840 pid = -1; 841 db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td); 842 if (td->td_proc != NULL && (td->td_proc->p_flag & P_INMEM) == 0) 843 db_printf("--- swapped out\n"); 844 else 845 db_trace_thread(td, count); 846 } 847 848 static void 849 _db_stack_trace_all(bool active_only) 850 { 851 struct thread *td; 852 jmp_buf jb; 853 void *prev_jb; 854 855 for (td = kdb_thr_first(); td != NULL; td = kdb_thr_next(td)) { 856 prev_jb = kdb_jmpbuf(jb); 857 if (setjmp(jb) == 0) { 858 if (TD_IS_RUNNING(td)) 859 db_printf("\nTracing command %s pid %d" 860 " tid %ld td %p (CPU %d)\n", 861 td->td_proc->p_comm, td->td_proc->p_pid, 862 (long)td->td_tid, td, td->td_oncpu); 863 else if (active_only) 864 continue; 865 else 866 db_printf("\nTracing command %s pid %d" 867 " tid %ld td %p\n", td->td_proc->p_comm, 868 td->td_proc->p_pid, (long)td->td_tid, td); 869 if (td->td_proc->p_flag & P_INMEM) 870 db_trace_thread(td, -1); 871 else 872 db_printf("--- swapped out\n"); 873 if (db_pager_quit) { 874 kdb_jmpbuf(prev_jb); 875 return; 876 } 877 } 878 kdb_jmpbuf(prev_jb); 879 } 880 } 881 882 static void 883 db_stack_trace_active(db_expr_t dummy, bool dummy2, db_expr_t dummy3, 884 char *dummy4) 885 { 886 887 _db_stack_trace_all(true); 888 } 889 890 static void 891 db_stack_trace_all(db_expr_t dummy, bool dummy2, db_expr_t dummy3, 892 char *dummy4) 893 { 894 895 _db_stack_trace_all(false); 896 } 897 898 /* 899 * Take the parsed expression value from the command line that was parsed 900 * as a hexadecimal value and convert it as if the expression was parsed 901 * as a decimal value. Returns -1 if the expression was not a valid 902 * decimal value. 903 */ 904 db_expr_t 905 db_hex2dec(db_expr_t expr) 906 { 907 uintptr_t x, y; 908 db_expr_t val; 909 910 y = 1; 911 val = 0; 912 x = expr; 913 while (x != 0) { 914 if (x % 16 > 9) 915 return (-1); 916 val += (x % 16) * (y); 917 x >>= 4; 918 y *= 10; 919 } 920 return (val); 921 } 922