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