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 [email protected]
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
db_skip_to_eol(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
db_command_init(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
db_command_register(struct command_table * list,struct command * cmd)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
db_command_unregister(struct command_table * list,struct command * cmd)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
db_cmd_match(char * name,struct command * cmd,struct command ** cmdp,int * resultp)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 {
297 *cmdp = cmd;
298 *resultp = CMD_FOUND;
299 }
300 }
301 }
302
303 /*
304 * Search for command prefix.
305 */
306 static int
db_cmd_search(char * name,struct command_table * table,struct command ** cmdp)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
db_cmd_list(struct command_table * table)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
db_command(struct command ** last_cmdp,struct command_table * cmd_table,int dopager)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 */
DB_COMMAND(panic,db_panic)512 DB_COMMAND(panic, db_panic)
513 {
514 db_disable_pager();
515 panic("from debugger");
516 }
517
518 void
db_command_loop(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
db_command_script(const char * command)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
db_error(const char * s)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
db_dump(db_expr_t dummy,bool dummy2,db_expr_t dummy3,char * dummy4)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
db_fncall_generic(db_expr_t addr,db_expr_t * rv,int nargs,db_expr_t args[])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
db_fncall(db_expr_t dummy1,bool dummy2,db_expr_t dummy3,char * dummy4)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
db_halt(db_expr_t dummy,bool dummy2,db_expr_t dummy3,char * dummy4)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
db_kill(db_expr_t dummy1,bool dummy2,db_expr_t dummy3,char * dummy4)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
db_reset(db_expr_t addr,bool have_addr,db_expr_t count __unused,char * modif __unused)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
db_watchdog(db_expr_t dummy1,bool dummy2,db_expr_t dummy3,char * dummy4)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
db_gdb(db_expr_t dummy1,bool dummy2,db_expr_t dummy3,char * dummy4)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
db_stack_trace(db_expr_t tid,bool hastid,db_expr_t count,char * modif)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
_db_stack_trace_all(bool active_only)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->td_state == TDS_RUNNING)
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
db_stack_trace_active(db_expr_t dummy,bool dummy2,db_expr_t dummy3,char * dummy4)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
db_stack_trace_all(db_expr_t dummy,bool dummy2,db_expr_t dummy3,char * dummy4)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
db_hex2dec(db_expr_t expr)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