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/param.h> 37 #include <sys/conf.h> 38 #include <sys/cons.h> 39 #include <sys/eventhandler.h> 40 #include <sys/kdb.h> 41 #include <sys/kernel.h> 42 #include <sys/linker_set.h> 43 #include <sys/lock.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/watchdog.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 #include <security/mac/mac_framework.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 #define DB_CMD(_name, _func, _flags) \ 82 { \ 83 .name = (_name), \ 84 .fcn = (_func), \ 85 .flag = (_flags), \ 86 .more = NULL, \ 87 } 88 #define DB_TABLE(_name, _more) \ 89 { \ 90 .name = (_name), \ 91 .fcn = NULL, \ 92 .more = (_more), \ 93 } 94 95 static struct db_command db_show_active_cmds[] = { 96 DB_CMD("trace", db_stack_trace_active, DB_CMD_MEMSAFE), 97 }; 98 struct db_command_table db_show_active_table = 99 LIST_HEAD_INITIALIZER(db_show_active_table); 100 101 static struct db_command db_show_all_cmds[] = { 102 DB_CMD("trace", db_stack_trace_all, DB_CMD_MEMSAFE), 103 }; 104 struct db_command_table db_show_all_table = 105 LIST_HEAD_INITIALIZER(db_show_all_table); 106 107 static struct db_command db_show_cmds[] = { 108 DB_TABLE("active", &db_show_active_table), 109 DB_TABLE("all", &db_show_all_table), 110 DB_CMD("registers", db_show_regs, DB_CMD_MEMSAFE), 111 DB_CMD("breaks", db_listbreak_cmd, DB_CMD_MEMSAFE), 112 DB_CMD("threads", db_show_threads, DB_CMD_MEMSAFE), 113 }; 114 struct db_command_table db_show_table = LIST_HEAD_INITIALIZER(db_show_table); 115 116 static struct db_command db_cmds[] = { 117 DB_TABLE("show", &db_show_table), 118 DB_CMD("print", db_print_cmd, 0), 119 DB_CMD("p", db_print_cmd, 0), 120 DB_CMD("examine", db_examine_cmd, CS_SET_DOT), 121 DB_CMD("x", db_examine_cmd, CS_SET_DOT), 122 DB_CMD("search", db_search_cmd, CS_OWN|CS_SET_DOT), 123 DB_CMD("set", db_set_cmd, CS_OWN|DB_CMD_MEMSAFE), 124 DB_CMD("write", db_write_cmd, CS_MORE|CS_SET_DOT), 125 DB_CMD("w", db_write_cmd, CS_MORE|CS_SET_DOT), 126 DB_CMD("delete", db_delete_cmd, 0), 127 DB_CMD("d", db_delete_cmd, 0), 128 DB_CMD("dump", db_dump, DB_CMD_MEMSAFE), 129 DB_CMD("break", db_breakpoint_cmd, 0), 130 DB_CMD("b", db_breakpoint_cmd, 0), 131 DB_CMD("dwatch", db_deletewatch_cmd, 0), 132 DB_CMD("watch", db_watchpoint_cmd, CS_MORE), 133 DB_CMD("dhwatch", db_deletehwatch_cmd, 0), 134 DB_CMD("hwatch", db_hwatchpoint_cmd, 0), 135 DB_CMD("step", db_single_step_cmd, DB_CMD_MEMSAFE), 136 DB_CMD("s", db_single_step_cmd, DB_CMD_MEMSAFE), 137 DB_CMD("continue", db_continue_cmd, DB_CMD_MEMSAFE), 138 DB_CMD("c", db_continue_cmd, DB_CMD_MEMSAFE), 139 DB_CMD("until", db_trace_until_call_cmd, DB_CMD_MEMSAFE), 140 DB_CMD("next", db_trace_until_matching_cmd, DB_CMD_MEMSAFE), 141 DB_CMD("match", db_trace_until_matching_cmd, 0), 142 DB_CMD("trace", db_stack_trace, CS_OWN|DB_CMD_MEMSAFE), 143 DB_CMD("t", db_stack_trace, CS_OWN|DB_CMD_MEMSAFE), 144 /* XXX alias for active trace */ 145 DB_CMD("acttrace", db_stack_trace_active, DB_CMD_MEMSAFE), 146 /* XXX alias for all trace */ 147 DB_CMD("alltrace", db_stack_trace_all, DB_CMD_MEMSAFE), 148 DB_CMD("where", db_stack_trace, CS_OWN|DB_CMD_MEMSAFE), 149 DB_CMD("bt", db_stack_trace, CS_OWN|DB_CMD_MEMSAFE), 150 DB_CMD("call", db_fncall, CS_OWN), 151 DB_CMD("ps", db_ps, DB_CMD_MEMSAFE), 152 DB_CMD("gdb", db_gdb, 0), 153 DB_CMD("halt", db_halt, DB_CMD_MEMSAFE), 154 DB_CMD("reboot", db_reset, DB_CMD_MEMSAFE), 155 DB_CMD("reset", db_reset, DB_CMD_MEMSAFE), 156 DB_CMD("kill", db_kill, CS_OWN|DB_CMD_MEMSAFE), 157 DB_CMD("watchdog", db_watchdog, CS_OWN|DB_CMD_MEMSAFE), 158 DB_CMD("thread", db_set_thread, 0), 159 DB_CMD("run", db_run_cmd, CS_OWN|DB_CMD_MEMSAFE), 160 DB_CMD("script", db_script_cmd, CS_OWN|DB_CMD_MEMSAFE), 161 DB_CMD("scripts", db_scripts_cmd, DB_CMD_MEMSAFE), 162 DB_CMD("unscript", db_unscript_cmd, CS_OWN|DB_CMD_MEMSAFE), 163 DB_CMD("capture", db_capture_cmd, CS_OWN|DB_CMD_MEMSAFE), 164 DB_CMD("textdump", db_textdump_cmd, CS_OWN|DB_CMD_MEMSAFE), 165 DB_CMD("findstack", db_findstack_cmd, 0), 166 DB_CMD("pprint", db_pprint_cmd, CS_OWN), 167 }; 168 struct db_command_table db_cmd_table = LIST_HEAD_INITIALIZER(db_cmd_table); 169 170 #undef DB_CMD 171 #undef DB_TABLE 172 173 static struct db_command *db_last_command = NULL; 174 175 /* 176 * if 'ed' style: 'dot' is set at start of last item printed, 177 * and '+' points to next line. 178 * Otherwise: 'dot' points to next item, '..' points to last. 179 */ 180 static bool db_ed_style = true; 181 182 /* 183 * Utility routine - discard tokens through end-of-line. 184 */ 185 void 186 db_skip_to_eol(void) 187 { 188 int t; 189 190 do { 191 t = db_read_token(); 192 } while (t != tEOL); 193 } 194 195 /* 196 * Results of command search. 197 */ 198 #define CMD_UNIQUE 0 199 #define CMD_FOUND 1 200 #define CMD_NONE 2 201 #define CMD_AMBIGUOUS 3 202 #define CMD_HELP 4 203 204 static void db_cmd_match(char *name, struct db_command *cmd, 205 struct db_command **cmdp, int *resultp); 206 static void db_cmd_list(struct db_command_table *table); 207 static int db_cmd_search(char *name, struct db_command_table *table, 208 struct db_command **cmdp); 209 static void db_command(struct db_command **last_cmdp, 210 struct db_command_table *cmd_table, bool dopager); 211 212 /* 213 * Initialize the command lists from the static tables. 214 */ 215 void 216 db_command_init(void) 217 { 218 int i; 219 220 for (i = 0; i < nitems(db_cmds); i++) 221 db_command_register(&db_cmd_table, &db_cmds[i]); 222 for (i = 0; i < nitems(db_show_cmds); i++) 223 db_command_register(&db_show_table, &db_show_cmds[i]); 224 for (i = 0; i < nitems(db_show_active_cmds); i++) 225 db_command_register(&db_show_active_table, 226 &db_show_active_cmds[i]); 227 for (i = 0; i < nitems(db_show_all_cmds); i++) 228 db_command_register(&db_show_all_table, &db_show_all_cmds[i]); 229 } 230 231 /* 232 * Register a command. 233 */ 234 void 235 db_command_register(struct db_command_table *list, struct db_command *cmd) 236 { 237 struct db_command *c, *last; 238 239 #ifdef MAC 240 if (mac_ddb_command_register(list, cmd)) { 241 printf("%s: MAC policy refused registration of command %s\n", 242 __func__, cmd->name); 243 return; 244 } 245 #endif 246 last = NULL; 247 LIST_FOREACH(c, list, next) { 248 int n = strcmp(cmd->name, c->name); 249 250 /* Check that the command is not already present. */ 251 if (n == 0) { 252 printf("%s: Warning, the command \"%s\" already exists;" 253 " ignoring request\n", __func__, cmd->name); 254 return; 255 } 256 if (n < 0) { 257 /* NB: keep list sorted lexicographically */ 258 LIST_INSERT_BEFORE(c, cmd, next); 259 return; 260 } 261 last = c; 262 } 263 if (last == NULL) 264 LIST_INSERT_HEAD(list, cmd, next); 265 else 266 LIST_INSERT_AFTER(last, cmd, next); 267 } 268 269 /* 270 * Remove a command previously registered with db_command_register. 271 */ 272 void 273 db_command_unregister(struct db_command_table *list, struct db_command *cmd) 274 { 275 struct db_command *c; 276 277 LIST_FOREACH(c, list, next) { 278 if (cmd == c) { 279 LIST_REMOVE(cmd, next); 280 return; 281 } 282 } 283 /* NB: intentionally quiet */ 284 } 285 286 /* 287 * Helper function to match a single command. 288 */ 289 static void 290 db_cmd_match(char *name, struct db_command *cmd, struct db_command **cmdp, 291 int *resultp) 292 { 293 char *lp, *rp; 294 int c; 295 296 lp = name; 297 rp = cmd->name; 298 while ((c = *lp) == *rp) { 299 if (c == 0) { 300 /* complete match */ 301 *cmdp = cmd; 302 *resultp = CMD_UNIQUE; 303 return; 304 } 305 lp++; 306 rp++; 307 } 308 if (c == 0) { 309 /* end of name, not end of command - 310 partial match */ 311 if (*resultp == CMD_FOUND) { 312 *resultp = CMD_AMBIGUOUS; 313 /* but keep looking for a full match - 314 this lets us match single letters */ 315 } else if (*resultp == CMD_NONE) { 316 *cmdp = cmd; 317 *resultp = CMD_FOUND; 318 } 319 } 320 } 321 322 /* 323 * Search for command prefix. 324 */ 325 static int 326 db_cmd_search(char *name, struct db_command_table *table, 327 struct db_command **cmdp) 328 { 329 struct db_command *cmd; 330 int result = CMD_NONE; 331 332 LIST_FOREACH(cmd, table, next) { 333 db_cmd_match(name,cmd,cmdp,&result); 334 if (result == CMD_UNIQUE) 335 break; 336 } 337 338 if (result == CMD_NONE) { 339 /* check for 'help' */ 340 if (name[0] == 'h' && name[1] == 'e' 341 && name[2] == 'l' && name[3] == 'p') 342 result = CMD_HELP; 343 } 344 return (result); 345 } 346 347 static void 348 db_cmd_list(struct db_command_table *table) 349 { 350 struct db_command *cmd; 351 int have_subcommands; 352 353 have_subcommands = 0; 354 LIST_FOREACH(cmd, table, next) { 355 if (cmd->more != NULL) 356 have_subcommands++; 357 db_printf("%-16s", cmd->name); 358 db_end_line(16); 359 } 360 361 if (have_subcommands > 0) { 362 db_printf("\nThe following have subcommands; append \"help\" " 363 "to list (e.g. \"show help\"):\n"); 364 LIST_FOREACH(cmd, table, next) { 365 if (cmd->more == NULL) 366 continue; 367 db_printf("%-16s", cmd->name); 368 db_end_line(16); 369 } 370 } 371 } 372 373 static void 374 db_command(struct db_command **last_cmdp, struct db_command_table *cmd_table, 375 bool dopager) 376 { 377 char modif[TOK_STRING_SIZE]; 378 struct db_command *cmd = NULL; 379 db_expr_t addr, count; 380 int t, result; 381 bool have_addr = false; 382 383 t = db_read_token(); 384 if (t == tEOL) { 385 /* empty line repeats last command, at 'next' */ 386 cmd = *last_cmdp; 387 addr = (db_expr_t)db_next; 388 have_addr = false; 389 count = 1; 390 modif[0] = '\0'; 391 } else if (t == tEXCL) { 392 db_fncall((db_expr_t)0, false, (db_expr_t)0, NULL); 393 return; 394 } else if (t != tIDENT) { 395 db_printf("Unrecognized input; use \"help\" " 396 "to list available commands\n"); 397 db_flush_lex(); 398 return; 399 } else { 400 /* 401 * Search for command 402 */ 403 while (cmd_table != NULL) { 404 result = db_cmd_search(db_tok_string, cmd_table, &cmd); 405 switch (result) { 406 case CMD_NONE: 407 db_printf("No such command; use \"help\" " 408 "to list available commands\n"); 409 db_flush_lex(); 410 return; 411 case CMD_AMBIGUOUS: 412 db_printf("Ambiguous\n"); 413 db_flush_lex(); 414 return; 415 case CMD_HELP: 416 if (cmd_table == &db_cmd_table) { 417 db_printf("This is ddb(4), the kernel debugger; " 418 "see https://man.FreeBSD.org/ddb/4 for help.\n"); 419 db_printf("Use \"bt\" for backtrace, \"dump\" for " 420 "kernel core dump, \"reset\" to reboot.\n"); 421 db_printf("Available commands:\n"); 422 } 423 db_cmd_list(cmd_table); 424 db_flush_lex(); 425 return; 426 case CMD_UNIQUE: 427 case CMD_FOUND: 428 break; 429 } 430 if ((cmd_table = cmd->more) != NULL) { 431 t = db_read_token(); 432 if (t != tIDENT) { 433 db_printf("Subcommand required; " 434 "available subcommands:\n"); 435 db_cmd_list(cmd_table); 436 db_flush_lex(); 437 return; 438 } 439 } 440 } 441 442 if ((cmd->flag & CS_OWN) == 0) { 443 /* 444 * Standard syntax: 445 * command [/modifier] [addr] [,count] 446 */ 447 t = db_read_token(); 448 if (t == tSLASH) { 449 t = db_read_token(); 450 if (t != tIDENT) { 451 db_printf("Bad modifier\n"); 452 db_flush_lex(); 453 return; 454 } 455 db_strcpy(modif, db_tok_string); 456 } else { 457 db_unread_token(t); 458 modif[0] = '\0'; 459 } 460 461 if (db_expression(&addr)) { 462 db_dot = (db_addr_t) addr; 463 db_last_addr = db_dot; 464 have_addr = true; 465 } else { 466 addr = (db_expr_t) db_dot; 467 have_addr = false; 468 } 469 470 t = db_read_token(); 471 if (t == tCOMMA) { 472 if (!db_expression(&count)) { 473 db_printf("Count missing\n"); 474 db_flush_lex(); 475 return; 476 } 477 } else { 478 db_unread_token(t); 479 count = -1; 480 } 481 482 if ((cmd->flag & CS_MORE) == 0) { 483 db_skip_to_eol(); 484 } 485 } 486 } 487 488 *last_cmdp = cmd; 489 if (cmd != NULL) { 490 #ifdef MAC 491 if (mac_ddb_command_exec(cmd, addr, have_addr, count, modif)) { 492 db_printf("MAC prevented execution of command %s\n", 493 cmd->name); 494 return; 495 } 496 #endif 497 /* 498 * Execute the command. 499 */ 500 if (dopager) 501 db_enable_pager(); 502 else 503 db_disable_pager(); 504 (*cmd->fcn)(addr, have_addr, count, modif); 505 if (dopager) 506 db_disable_pager(); 507 508 if (cmd->flag & CS_SET_DOT) { 509 /* 510 * If command changes dot, set dot to previous address 511 * displayed (if 'ed' style). 512 */ 513 db_dot = db_ed_style ? db_prev : db_next; 514 } else { 515 /* 516 * If command does not change dot, set 'next' location 517 * to be the same. 518 */ 519 db_next = db_dot; 520 } 521 } 522 } 523 524 /* 525 * At least one non-optional command must be implemented using 526 * DB_COMMAND() so that db_cmd_set gets created. Here is one. 527 */ 528 DB_COMMAND_FLAGS(panic, db_panic, DB_CMD_MEMSAFE) 529 { 530 db_disable_pager(); 531 panic("from debugger"); 532 } 533 534 void 535 db_command_loop(void) 536 { 537 /* 538 * Initialize 'prev' and 'next' to dot. 539 */ 540 db_prev = db_dot; 541 db_next = db_dot; 542 543 db_cmd_loop_done = 0; 544 while (!db_cmd_loop_done) { 545 if (db_print_position() != 0) 546 db_printf("\n"); 547 548 db_printf("db> "); 549 (void)db_read_line(); 550 551 db_command(&db_last_command, &db_cmd_table, /* dopager */ true); 552 } 553 } 554 555 /* 556 * Execute a command on behalf of a script. The caller is responsible for 557 * making sure that the command string is < DB_MAXLINE or it will be 558 * truncated. 559 * 560 * XXXRW: Runs by injecting faked input into DDB input stream; it would be 561 * nicer to use an alternative approach that didn't mess with the previous 562 * command buffer. 563 */ 564 void 565 db_command_script(const char *command) 566 { 567 db_prev = db_next = db_dot; 568 db_inject_line(command); 569 db_command(&db_last_command, &db_cmd_table, /* dopager */ false); 570 } 571 572 void 573 db_error(const char *s) 574 { 575 if (s) 576 db_printf("%s", s); 577 db_flush_lex(); 578 kdb_reenter_silent(); 579 } 580 581 static void 582 db_dump(db_expr_t dummy, bool dummy2, db_expr_t dummy3, char *dummy4) 583 { 584 int error; 585 586 if (textdump_pending) { 587 db_printf("textdump_pending set.\n" 588 "run \"textdump unset\" first or \"textdump dump\" for a textdump.\n"); 589 return; 590 } 591 error = doadump(false); 592 if (error) { 593 db_printf("Cannot dump: "); 594 switch (error) { 595 case EBUSY: 596 db_printf("debugger got invoked while dumping.\n"); 597 break; 598 case ENXIO: 599 db_printf("no dump device specified.\n"); 600 break; 601 default: 602 db_printf("unknown error (error=%d).\n", error); 603 break; 604 } 605 } 606 } 607 608 /* 609 * Call random function: 610 * !expr(arg,arg,arg) 611 */ 612 613 /* The generic implementation supports a maximum of 10 arguments. */ 614 typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t, 615 db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t); 616 617 static __inline int 618 db_fncall_generic(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[]) 619 { 620 __db_f *f = (__db_f *)addr; 621 622 if (nargs > 10) { 623 db_printf("Too many arguments (max 10)\n"); 624 return (0); 625 } 626 *rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5], 627 args[6], args[7], args[8], args[9]); 628 return (1); 629 } 630 631 static void 632 db_fncall(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 633 { 634 db_expr_t fn_addr; 635 db_expr_t args[DB_MAXARGS]; 636 int nargs = 0; 637 db_expr_t retval; 638 int t; 639 640 if (!db_expression(&fn_addr)) { 641 db_printf("Bad function\n"); 642 db_flush_lex(); 643 return; 644 } 645 646 t = db_read_token(); 647 if (t == tLPAREN) { 648 if (db_expression(&args[0])) { 649 nargs++; 650 while ((t = db_read_token()) == tCOMMA) { 651 if (nargs == DB_MAXARGS) { 652 db_printf("Too many arguments (max %d)\n", DB_MAXARGS); 653 db_flush_lex(); 654 return; 655 } 656 if (!db_expression(&args[nargs])) { 657 db_printf("Argument missing\n"); 658 db_flush_lex(); 659 return; 660 } 661 nargs++; 662 } 663 db_unread_token(t); 664 } 665 if (db_read_token() != tRPAREN) { 666 db_printf("Mismatched parens\n"); 667 db_flush_lex(); 668 return; 669 } 670 } 671 db_skip_to_eol(); 672 db_disable_pager(); 673 674 if (DB_CALL(fn_addr, &retval, nargs, args)) 675 db_printf("= %#lr\n", (long)retval); 676 } 677 678 static void 679 db_halt(db_expr_t dummy, bool dummy2, db_expr_t dummy3, char *dummy4) 680 { 681 682 cpu_halt(); 683 } 684 685 static void 686 db_kill(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 687 { 688 db_expr_t old_radix, pid, sig; 689 struct proc *p; 690 691 #define DB_ERROR(f) do { db_printf f; db_flush_lex(); goto out; } while (0) 692 693 /* 694 * PIDs and signal numbers are typically represented in base 695 * 10, so make that the default here. It can, of course, be 696 * overridden by specifying a prefix. 697 */ 698 old_radix = db_radix; 699 db_radix = 10; 700 /* Retrieve arguments. */ 701 if (!db_expression(&sig)) 702 DB_ERROR(("Missing signal number\n")); 703 if (!db_expression(&pid)) 704 DB_ERROR(("Missing process ID\n")); 705 db_skip_to_eol(); 706 if (!_SIG_VALID(sig)) 707 DB_ERROR(("Signal number out of range\n")); 708 709 /* 710 * Find the process in question. allproc_lock is not needed 711 * since we're in DDB. 712 */ 713 /* sx_slock(&allproc_lock); */ 714 FOREACH_PROC_IN_SYSTEM(p) 715 if (p->p_pid == pid) 716 break; 717 /* sx_sunlock(&allproc_lock); */ 718 if (p == NULL) 719 DB_ERROR(("Can't find process with pid %ld\n", (long) pid)); 720 721 /* If it's already locked, bail; otherwise, do the deed. */ 722 if (PROC_TRYLOCK(p) == 0) 723 DB_ERROR(("Can't lock process with pid %ld\n", (long) pid)); 724 else { 725 pksignal(p, sig, NULL); 726 PROC_UNLOCK(p); 727 } 728 729 out: 730 db_radix = old_radix; 731 #undef DB_ERROR 732 } 733 734 /* 735 * Reboot. In case there is an additional argument, take it as delay in 736 * seconds. Default to 15s if we cannot parse it and make sure we will 737 * never wait longer than 1 week. Some code is similar to 738 * kern_shutdown.c:shutdown_panic(). 739 */ 740 #ifndef DB_RESET_MAXDELAY 741 #define DB_RESET_MAXDELAY (3600 * 24 * 7) 742 #endif 743 744 static void 745 db_reset(db_expr_t addr, bool have_addr, db_expr_t count __unused, 746 char *modif) 747 { 748 int delay, loop; 749 750 if (have_addr) { 751 delay = (int)db_hex2dec(addr); 752 753 /* If we parse to fail, use 15s. */ 754 if (delay == -1) 755 delay = 15; 756 757 /* Cap at one week. */ 758 if ((uintmax_t)delay > (uintmax_t)DB_RESET_MAXDELAY) 759 delay = DB_RESET_MAXDELAY; 760 761 db_printf("Automatic reboot in %d seconds - " 762 "press a key on the console to abort\n", delay); 763 for (loop = delay * 10; loop > 0; --loop) { 764 DELAY(1000 * 100); /* 1/10th second */ 765 /* Did user type a key? */ 766 if (cncheckc() != -1) 767 return; 768 } 769 } 770 771 /* 772 * Conditionally try the standard reboot path, so any registered 773 * shutdown/reset handlers have a chance to run first. Some platforms 774 * may not support the machine-dependent mechanism used by cpu_reset() 775 * and rely on some other non-standard mechanism to perform the reset. 776 * For example, the BCM2835 watchdog driver or gpio-poweroff driver. 777 */ 778 if (modif[0] != 's') { 779 kern_reboot(RB_NOSYNC); 780 /* NOTREACHED */ 781 } 782 783 cpu_reset(); 784 } 785 786 static void 787 db_watchdog(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 788 { 789 db_expr_t old_radix, tout; 790 int err, i; 791 792 old_radix = db_radix; 793 db_radix = 10; 794 err = db_expression(&tout); 795 db_skip_to_eol(); 796 db_radix = old_radix; 797 798 /* If no argument is provided the watchdog will just be disabled. */ 799 if (err == 0) { 800 db_printf("No argument provided, disabling watchdog\n"); 801 tout = 0; 802 } else if ((tout & WD_INTERVAL) == WD_TO_NEVER) { 803 db_error("Out of range watchdog interval\n"); 804 return; 805 } 806 EVENTHANDLER_INVOKE(watchdog_list, tout, &i); 807 } 808 809 static void 810 db_gdb(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 811 { 812 813 if (kdb_dbbe_select("gdb") != 0) { 814 db_printf("The remote GDB backend could not be selected.\n"); 815 return; 816 } 817 /* 818 * Mark that we are done in the debugger. kdb_trap() 819 * should re-enter with the new backend. 820 */ 821 db_cmd_loop_done = 1; 822 db_printf("(ctrl-c will return control to ddb)\n"); 823 } 824 825 static void 826 db_stack_trace(db_expr_t tid, bool hastid, db_expr_t count, char *modif) 827 { 828 struct thread *td; 829 db_expr_t radix; 830 pid_t pid; 831 int t; 832 833 /* 834 * We parse our own arguments. We don't like the default radix. 835 */ 836 radix = db_radix; 837 db_radix = 10; 838 hastid = db_expression(&tid); 839 t = db_read_token(); 840 if (t == tCOMMA) { 841 if (!db_expression(&count)) { 842 db_printf("Count missing\n"); 843 db_flush_lex(); 844 db_radix = radix; 845 return; 846 } 847 } else { 848 db_unread_token(t); 849 count = -1; 850 } 851 db_skip_to_eol(); 852 db_radix = radix; 853 854 if (hastid) { 855 td = kdb_thr_lookup((lwpid_t)tid); 856 if (td == NULL) 857 td = kdb_thr_from_pid((pid_t)tid); 858 if (td == NULL) { 859 db_printf("Thread %d not found\n", (int)tid); 860 return; 861 } 862 } else 863 td = kdb_thread; 864 if (td->td_proc != NULL) 865 pid = td->td_proc->p_pid; 866 else 867 pid = -1; 868 db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td); 869 if (td->td_proc != NULL && (td->td_proc->p_flag & P_INMEM) == 0) 870 db_printf("--- swapped out\n"); 871 else 872 db_trace_thread(td, count); 873 } 874 875 static void 876 _db_stack_trace_all(bool active_only) 877 { 878 struct thread *td; 879 jmp_buf jb; 880 void *prev_jb; 881 882 for (td = kdb_thr_first(); td != NULL; td = kdb_thr_next(td)) { 883 prev_jb = kdb_jmpbuf(jb); 884 if (setjmp(jb) == 0) { 885 if (TD_IS_RUNNING(td)) 886 db_printf("\nTracing command %s pid %d" 887 " tid %ld td %p (CPU %d)\n", 888 td->td_proc->p_comm, td->td_proc->p_pid, 889 (long)td->td_tid, td, td->td_oncpu); 890 else if (active_only) 891 continue; 892 else 893 db_printf("\nTracing command %s pid %d" 894 " tid %ld td %p\n", td->td_proc->p_comm, 895 td->td_proc->p_pid, (long)td->td_tid, td); 896 if (td->td_proc->p_flag & P_INMEM) 897 db_trace_thread(td, -1); 898 else 899 db_printf("--- swapped out\n"); 900 if (db_pager_quit) { 901 kdb_jmpbuf(prev_jb); 902 return; 903 } 904 } 905 kdb_jmpbuf(prev_jb); 906 } 907 } 908 909 static void 910 db_stack_trace_active(db_expr_t dummy, bool dummy2, db_expr_t dummy3, 911 char *dummy4) 912 { 913 914 _db_stack_trace_all(true); 915 } 916 917 static void 918 db_stack_trace_all(db_expr_t dummy, bool dummy2, db_expr_t dummy3, 919 char *dummy4) 920 { 921 922 _db_stack_trace_all(false); 923 } 924 925 /* 926 * Take the parsed expression value from the command line that was parsed 927 * as a hexadecimal value and convert it as if the expression was parsed 928 * as a decimal value. Returns -1 if the expression was not a valid 929 * decimal value. 930 */ 931 db_expr_t 932 db_hex2dec(db_expr_t expr) 933 { 934 uintptr_t x, y; 935 db_expr_t val; 936 937 y = 1; 938 val = 0; 939 x = expr; 940 while (x != 0) { 941 if (x % 16 > 9) 942 return (-1); 943 val += (x % 16) * (y); 944 x >>= 4; 945 y *= 10; 946 } 947 return (val); 948 } 949