db_command.c revision 283315 
1/*-
2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
13 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
19 *  School of Computer Science
20 *  Carnegie Mellon University
21 *  Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie the
24 * rights to redistribute these changes.
25 */
26/*
27 *	Author: David B. Golub, Carnegie Mellon University
28 *	Date:	7/90
29 */
30/*
31 * Command dispatcher.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/sys/ddb/db_command.c 283315 2015-05-23 14:59:27Z pfg $");
36
37#include <sys/param.h>
38#include <sys/linker_set.h>
39#include <sys/lock.h>
40#include <sys/kdb.h>
41#include <sys/mutex.h>
42#include <sys/proc.h>
43#include <sys/reboot.h>
44#include <sys/signalvar.h>
45#include <sys/systm.h>
46#include <sys/cons.h>
47#include <sys/conf.h>
48#include <sys/watchdog.h>
49#include <sys/kernel.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/*
60 * Exported global variables
61 */
62bool		db_cmd_loop_done;
63db_addr_t	db_dot;
64db_addr_t	db_last_addr;
65db_addr_t	db_prev;
66db_addr_t	db_next;
67
68static db_cmdfcn_t	db_dump;
69static db_cmdfcn_t	db_fncall;
70static db_cmdfcn_t	db_gdb;
71static db_cmdfcn_t	db_halt;
72static db_cmdfcn_t	db_kill;
73static db_cmdfcn_t	db_reset;
74static db_cmdfcn_t	db_stack_trace;
75static db_cmdfcn_t	db_stack_trace_all;
76static db_cmdfcn_t	db_watchdog;
77
78/*
79 * 'show' commands
80 */
81
82static struct command db_show_all_cmds[] = {
83	{ "trace",	db_stack_trace_all,	0,	NULL },
84};
85struct command_table db_show_all_table =
86    LIST_HEAD_INITIALIZER(db_show_all_table);
87
88static struct command db_show_cmds[] = {
89	{ "all",	0,			0,	&db_show_all_table },
90	{ "registers",	db_show_regs,		0,	NULL },
91	{ "breaks",	db_listbreak_cmd, 	0,	NULL },
92	{ "threads",	db_show_threads,	0,	NULL },
93};
94struct command_table db_show_table = LIST_HEAD_INITIALIZER(db_show_table);
95
96static struct command db_cmds[] = {
97	{ "print",	db_print_cmd,		0,	NULL },
98	{ "p",		db_print_cmd,		0,	NULL },
99	{ "examine",	db_examine_cmd,		CS_SET_DOT, NULL },
100	{ "x",		db_examine_cmd,		CS_SET_DOT, NULL },
101	{ "search",	db_search_cmd,		CS_OWN|CS_SET_DOT, NULL },
102	{ "set",	db_set_cmd,		CS_OWN,	NULL },
103	{ "write",	db_write_cmd,		CS_MORE|CS_SET_DOT, NULL },
104	{ "w",		db_write_cmd,		CS_MORE|CS_SET_DOT, NULL },
105	{ "delete",	db_delete_cmd,		0,	NULL },
106	{ "d",		db_delete_cmd,		0,	NULL },
107	{ "dump",	db_dump,		0,	NULL },
108	{ "break",	db_breakpoint_cmd,	0,	NULL },
109	{ "b",		db_breakpoint_cmd,	0,	NULL },
110	{ "dwatch",	db_deletewatch_cmd,	0,	NULL },
111	{ "watch",	db_watchpoint_cmd,	CS_MORE,NULL },
112	{ "dhwatch",	db_deletehwatch_cmd,	0,      NULL },
113	{ "hwatch",	db_hwatchpoint_cmd,	0,      NULL },
114	{ "step",	db_single_step_cmd,	0,	NULL },
115	{ "s",		db_single_step_cmd,	0,	NULL },
116	{ "continue",	db_continue_cmd,	0,	NULL },
117	{ "c",		db_continue_cmd,	0,	NULL },
118	{ "until",	db_trace_until_call_cmd,0,	NULL },
119	{ "next",	db_trace_until_matching_cmd,0,	NULL },
120	{ "match",	db_trace_until_matching_cmd,0,	NULL },
121	{ "trace",	db_stack_trace,		CS_OWN,	NULL },
122	{ "t",		db_stack_trace,		CS_OWN,	NULL },
123	/* XXX alias for all trace */
124	{ "alltrace",	db_stack_trace_all,	0,	NULL },
125	{ "where",	db_stack_trace,		CS_OWN,	NULL },
126	{ "bt",		db_stack_trace,		CS_OWN,	NULL },
127	{ "call",	db_fncall,		CS_OWN,	NULL },
128	{ "show",	0,			0,	&db_show_table },
129	{ "ps",		db_ps,			0,	NULL },
130	{ "gdb",	db_gdb,			0,	NULL },
131	{ "halt",	db_halt,		0,	NULL },
132	{ "reboot",	db_reset,		0,	NULL },
133	{ "reset",	db_reset,		0,	NULL },
134	{ "kill",	db_kill,		CS_OWN,	NULL },
135	{ "watchdog",	db_watchdog,		CS_OWN,	NULL },
136	{ "thread",	db_set_thread,		CS_OWN,	NULL },
137	{ "run",	db_run_cmd,		CS_OWN,	NULL },
138	{ "script",	db_script_cmd,		CS_OWN,	NULL },
139	{ "scripts",	db_scripts_cmd,		0,	NULL },
140	{ "unscript",	db_unscript_cmd,	CS_OWN,	NULL },
141	{ "capture",	db_capture_cmd,		CS_OWN,	NULL },
142	{ "textdump",	db_textdump_cmd,	CS_OWN, NULL },
143	{ "findstack",	db_findstack_cmd,	0,	NULL },
144};
145struct command_table db_cmd_table = LIST_HEAD_INITIALIZER(db_cmd_table);
146
147static struct command	*db_last_command = 0;
148
149/*
150 * if 'ed' style: 'dot' is set at start of last item printed,
151 * and '+' points to next line.
152 * Otherwise: 'dot' points to next item, '..' points to last.
153 */
154static bool	db_ed_style = true;
155
156/*
157 * Utility routine - discard tokens through end-of-line.
158 */
159void
160db_skip_to_eol(void)
161{
162	int	t;
163	do {
164	    t = db_read_token();
165	} while (t != tEOL);
166}
167
168/*
169 * Results of command search.
170 */
171#define	CMD_UNIQUE	0
172#define	CMD_FOUND	1
173#define	CMD_NONE	2
174#define	CMD_AMBIGUOUS	3
175#define	CMD_HELP	4
176
177static void	db_cmd_match(char *name, struct command *cmd,
178		    struct command **cmdp, int *resultp);
179static void	db_cmd_list(struct command_table *table);
180static int	db_cmd_search(char *name, struct command_table *table,
181		    struct command **cmdp);
182static void	db_command(struct command **last_cmdp,
183		    struct command_table *cmd_table, int dopager);
184
185/*
186 * Initialize the command lists from the static tables.
187 */
188void
189db_command_init(void)
190{
191#define	N(a)	(sizeof(a) / sizeof(a[0]))
192	int i;
193
194	for (i = 0; i < N(db_cmds); i++)
195		db_command_register(&db_cmd_table, &db_cmds[i]);
196	for (i = 0; i < N(db_show_cmds); i++)
197		db_command_register(&db_show_table, &db_show_cmds[i]);
198	for (i = 0; i < N(db_show_all_cmds); i++)
199		db_command_register(&db_show_all_table, &db_show_all_cmds[i]);
200#undef N
201}
202
203/*
204 * Register a command.
205 */
206void
207db_command_register(struct command_table *list, struct command *cmd)
208{
209	struct command *c, *last;
210
211	last = NULL;
212	LIST_FOREACH(c, list, next) {
213		int n = strcmp(cmd->name, c->name);
214
215		/* Check that the command is not already present. */
216		if (n == 0) {
217			printf("%s: Warning, the command \"%s\" already exists;"
218			     " ignoring request\n", __func__, cmd->name);
219			return;
220		}
221		if (n < 0) {
222			/* NB: keep list sorted lexicographically */
223			LIST_INSERT_BEFORE(c, cmd, next);
224			return;
225		}
226		last = c;
227	}
228	if (last == NULL)
229		LIST_INSERT_HEAD(list, cmd, next);
230	else
231		LIST_INSERT_AFTER(last, cmd, next);
232}
233
234/*
235 * Remove a command previously registered with db_command_register.
236 */
237void
238db_command_unregister(struct command_table *list, struct command *cmd)
239{
240	struct command *c;
241
242	LIST_FOREACH(c, list, next) {
243		if (cmd == c) {
244			LIST_REMOVE(cmd, next);
245			return;
246		}
247	}
248	/* NB: intentionally quiet */
249}
250
251/*
252 * Helper function to match a single command.
253 */
254static void
255db_cmd_match(char *name, struct command *cmd, struct command **cmdp,
256    int *resultp)
257{
258	char *lp, *rp;
259	int c;
260
261	lp = name;
262	rp = cmd->name;
263	while ((c = *lp) == *rp) {
264		if (c == 0) {
265			/* complete match */
266			*cmdp = cmd;
267			*resultp = CMD_UNIQUE;
268			return;
269		}
270		lp++;
271		rp++;
272	}
273	if (c == 0) {
274		/* end of name, not end of command -
275		   partial match */
276		if (*resultp == CMD_FOUND) {
277			*resultp = CMD_AMBIGUOUS;
278			/* but keep looking for a full match -
279			   this lets us match single letters */
280		} else {
281			*cmdp = cmd;
282			*resultp = CMD_FOUND;
283		}
284	}
285}
286
287/*
288 * Search for command prefix.
289 */
290static int
291db_cmd_search(char *name, struct command_table *table, struct command **cmdp)
292{
293	struct command	*cmd;
294	int		result = CMD_NONE;
295
296	LIST_FOREACH(cmd, table, next) {
297		db_cmd_match(name,cmd,cmdp,&result);
298		if (result == CMD_UNIQUE)
299			break;
300	}
301
302	if (result == CMD_NONE) {
303		/* check for 'help' */
304		if (name[0] == 'h' && name[1] == 'e'
305		    && name[2] == 'l' && name[3] == 'p')
306			result = CMD_HELP;
307	}
308	return (result);
309}
310
311static void
312db_cmd_list(struct command_table *table)
313{
314	struct command	*cmd;
315
316	LIST_FOREACH(cmd, table, next) {
317		db_printf("%-16s", cmd->name);
318		db_end_line(16);
319	}
320}
321
322static void
323db_command(struct command **last_cmdp, struct command_table *cmd_table,
324    int dopager)
325{
326	struct command	*cmd = NULL;
327	int		t;
328	char		modif[TOK_STRING_SIZE];
329	db_expr_t	addr, count;
330	bool		have_addr = false;
331	int		result;
332
333	t = db_read_token();
334	if (t == tEOL) {
335	    /* empty line repeats last command, at 'next' */
336	    cmd = *last_cmdp;
337	    addr = (db_expr_t)db_next;
338	    have_addr = false;
339	    count = 1;
340	    modif[0] = '\0';
341	}
342	else if (t == tEXCL) {
343	    db_fncall((db_expr_t)0, (bool)false, (db_expr_t)0, (char *)0);
344	    return;
345	}
346	else if (t != tIDENT) {
347	    db_printf("?\n");
348	    db_flush_lex();
349	    return;
350	}
351	else {
352	    /*
353	     * Search for command
354	     */
355	    while (cmd_table) {
356		result = db_cmd_search(db_tok_string,
357				       cmd_table,
358				       &cmd);
359		switch (result) {
360		    case CMD_NONE:
361			db_printf("No such command\n");
362			db_flush_lex();
363			return;
364		    case CMD_AMBIGUOUS:
365			db_printf("Ambiguous\n");
366			db_flush_lex();
367			return;
368		    case CMD_HELP:
369			db_cmd_list(cmd_table);
370			db_flush_lex();
371			return;
372		    default:
373			break;
374		}
375		if ((cmd_table = cmd->more) != NULL) {
376		    t = db_read_token();
377		    if (t != tIDENT) {
378			db_cmd_list(cmd_table);
379			db_flush_lex();
380			return;
381		    }
382		}
383	    }
384
385	    if ((cmd->flag & CS_OWN) == 0) {
386		/*
387		 * Standard syntax:
388		 * command [/modifier] [addr] [,count]
389		 */
390		t = db_read_token();
391		if (t == tSLASH) {
392		    t = db_read_token();
393		    if (t != tIDENT) {
394			db_printf("Bad modifier\n");
395			db_flush_lex();
396			return;
397		    }
398		    db_strcpy(modif, db_tok_string);
399		}
400		else {
401		    db_unread_token(t);
402		    modif[0] = '\0';
403		}
404
405		if (db_expression(&addr)) {
406		    db_dot = (db_addr_t) addr;
407		    db_last_addr = db_dot;
408		    have_addr = true;
409		}
410		else {
411		    addr = (db_expr_t) db_dot;
412		    have_addr = false;
413		}
414		t = db_read_token();
415		if (t == tCOMMA) {
416		    if (!db_expression(&count)) {
417			db_printf("Count missing\n");
418			db_flush_lex();
419			return;
420		    }
421		}
422		else {
423		    db_unread_token(t);
424		    count = -1;
425		}
426		if ((cmd->flag & CS_MORE) == 0) {
427		    db_skip_to_eol();
428		}
429	    }
430	}
431	*last_cmdp = cmd;
432	if (cmd != 0) {
433	    /*
434	     * Execute the command.
435	     */
436	    if (dopager)
437		db_enable_pager();
438	    else
439		db_disable_pager();
440	    (*cmd->fcn)(addr, have_addr, count, modif);
441	    if (dopager)
442		db_disable_pager();
443
444	    if (cmd->flag & CS_SET_DOT) {
445		/*
446		 * If command changes dot, set dot to
447		 * previous address displayed (if 'ed' style).
448		 */
449		if (db_ed_style) {
450		    db_dot = db_prev;
451		}
452		else {
453		    db_dot = db_next;
454		}
455	    }
456	    else {
457		/*
458		 * If command does not change dot,
459		 * set 'next' location to be the same.
460		 */
461		db_next = db_dot;
462	    }
463	}
464}
465
466/*
467 * At least one non-optional command must be implemented using
468 * DB_COMMAND() so that db_cmd_set gets created.  Here is one.
469 */
470DB_COMMAND(panic, db_panic)
471{
472	db_disable_pager();
473	panic("from debugger");
474}
475
476void
477db_command_loop(void)
478{
479	/*
480	 * Initialize 'prev' and 'next' to dot.
481	 */
482	db_prev = db_dot;
483	db_next = db_dot;
484
485	db_cmd_loop_done = 0;
486	while (!db_cmd_loop_done) {
487	    if (db_print_position() != 0)
488		db_printf("\n");
489
490	    db_printf("db> ");
491	    (void) db_read_line();
492
493	    db_command(&db_last_command, &db_cmd_table, /* dopager */ 1);
494	}
495}
496
497/*
498 * Execute a command on behalf of a script.  The caller is responsible for
499 * making sure that the command string is < DB_MAXLINE or it will be
500 * truncated.
501 *
502 * XXXRW: Runs by injecting faked input into DDB input stream; it would be
503 * nicer to use an alternative approach that didn't mess with the previous
504 * command buffer.
505 */
506void
507db_command_script(const char *command)
508{
509	db_prev = db_next = db_dot;
510	db_inject_line(command);
511	db_command(&db_last_command, &db_cmd_table, /* dopager */ 0);
512}
513
514void
515db_error(const char *s)
516{
517	if (s)
518	    db_printf("%s", s);
519	db_flush_lex();
520	kdb_reenter();
521}
522
523static void
524db_dump(db_expr_t dummy, bool dummy2, db_expr_t dummy3, char *dummy4)
525{
526	int error;
527
528	if (textdump_pending) {
529		db_printf("textdump_pending set.\n"
530		    "run \"textdump unset\" first or \"textdump dump\" for a textdump.\n");
531		return;
532	}
533	error = doadump(false);
534	if (error) {
535		db_printf("Cannot dump: ");
536		switch (error) {
537		case EBUSY:
538			db_printf("debugger got invoked while dumping.\n");
539			break;
540		case ENXIO:
541			db_printf("no dump device specified.\n");
542			break;
543		default:
544			db_printf("unknown error (error=%d).\n", error);
545			break;
546		}
547	}
548}
549
550/*
551 * Call random function:
552 * !expr(arg,arg,arg)
553 */
554
555/* The generic implementation supports a maximum of 10 arguments. */
556typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t,
557    db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t);
558
559static __inline int
560db_fncall_generic(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[])
561{
562	__db_f *f = (__db_f *)addr;
563
564	if (nargs > 10) {
565		db_printf("Too many arguments (max 10)\n");
566		return (0);
567	}
568	*rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5],
569	    args[6], args[7], args[8], args[9]);
570	return (1);
571}
572
573static void
574db_fncall(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
575{
576	db_expr_t	fn_addr;
577	db_expr_t	args[DB_MAXARGS];
578	int		nargs = 0;
579	db_expr_t	retval;
580	int		t;
581
582	if (!db_expression(&fn_addr)) {
583	    db_printf("Bad function\n");
584	    db_flush_lex();
585	    return;
586	}
587
588	t = db_read_token();
589	if (t == tLPAREN) {
590	    if (db_expression(&args[0])) {
591		nargs++;
592		while ((t = db_read_token()) == tCOMMA) {
593		    if (nargs == DB_MAXARGS) {
594			db_printf("Too many arguments (max %d)\n", DB_MAXARGS);
595			db_flush_lex();
596			return;
597		    }
598		    if (!db_expression(&args[nargs])) {
599			db_printf("Argument missing\n");
600			db_flush_lex();
601			return;
602		    }
603		    nargs++;
604		}
605		db_unread_token(t);
606	    }
607	    if (db_read_token() != tRPAREN) {
608		db_printf("?\n");
609		db_flush_lex();
610		return;
611	    }
612	}
613	db_skip_to_eol();
614	db_disable_pager();
615
616	if (DB_CALL(fn_addr, &retval, nargs, args))
617		db_printf("= %#lr\n", (long)retval);
618}
619
620static void
621db_halt(db_expr_t dummy, bool dummy2, db_expr_t dummy3, char *dummy4)
622{
623
624	cpu_halt();
625}
626
627static void
628db_kill(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
629{
630	db_expr_t old_radix, pid, sig;
631	struct proc *p;
632
633#define	DB_ERROR(f)	do { db_printf f; db_flush_lex(); goto out; } while (0)
634
635	/*
636	 * PIDs and signal numbers are typically represented in base
637	 * 10, so make that the default here.  It can, of course, be
638	 * overridden by specifying a prefix.
639	 */
640	old_radix = db_radix;
641	db_radix = 10;
642	/* Retrieve arguments. */
643	if (!db_expression(&sig))
644		DB_ERROR(("Missing signal number\n"));
645	if (!db_expression(&pid))
646		DB_ERROR(("Missing process ID\n"));
647	db_skip_to_eol();
648	if (!_SIG_VALID(sig))
649		DB_ERROR(("Signal number out of range\n"));
650
651	/*
652	 * Find the process in question.  allproc_lock is not needed
653	 * since we're in DDB.
654	 */
655	/* sx_slock(&allproc_lock); */
656	FOREACH_PROC_IN_SYSTEM(p)
657	    if (p->p_pid == pid)
658		    break;
659	/* sx_sunlock(&allproc_lock); */
660	if (p == NULL)
661		DB_ERROR(("Can't find process with pid %ld\n", (long) pid));
662
663	/* If it's already locked, bail; otherwise, do the deed. */
664	if (PROC_TRYLOCK(p) == 0)
665		DB_ERROR(("Can't lock process with pid %ld\n", (long) pid));
666	else {
667		pksignal(p, sig, NULL);
668		PROC_UNLOCK(p);
669	}
670
671out:
672	db_radix = old_radix;
673#undef DB_ERROR
674}
675
676/*
677 * Reboot.  In case there is an additional argument, take it as delay in
678 * seconds.  Default to 15s if we cannot parse it and make sure we will
679 * never wait longer than 1 week.  Some code is similar to
680 * kern_shutdown.c:shutdown_panic().
681 */
682#ifndef	DB_RESET_MAXDELAY
683#define	DB_RESET_MAXDELAY	(3600 * 24 * 7)
684#endif
685
686static void
687db_reset(db_expr_t addr, bool have_addr, db_expr_t count __unused,
688    char *modif __unused)
689{
690	int delay, loop;
691
692	if (have_addr) {
693		delay = (int)db_hex2dec(addr);
694
695		/* If we parse to fail, use 15s. */
696		if (delay == -1)
697			delay = 15;
698
699		/* Cap at one week. */
700		if ((uintmax_t)delay > (uintmax_t)DB_RESET_MAXDELAY)
701			delay = DB_RESET_MAXDELAY;
702
703		db_printf("Automatic reboot in %d seconds - "
704		    "press a key on the console to abort\n", delay);
705		for (loop = delay * 10; loop > 0; --loop) {
706			DELAY(1000 * 100); /* 1/10th second */
707			/* Did user type a key? */
708			if (cncheckc() != -1)
709				return;
710		}
711	}
712
713	cpu_reset();
714}
715
716static void
717db_watchdog(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
718{
719	db_expr_t old_radix, tout;
720	int err, i;
721
722	old_radix = db_radix;
723	db_radix = 10;
724	err = db_expression(&tout);
725	db_skip_to_eol();
726	db_radix = old_radix;
727
728	/* If no argument is provided the watchdog will just be disabled. */
729	if (err == 0) {
730		db_printf("No argument provided, disabling watchdog\n");
731		tout = 0;
732	} else if ((tout & WD_INTERVAL) == WD_TO_NEVER) {
733		db_error("Out of range watchdog interval\n");
734		return;
735	}
736	EVENTHANDLER_INVOKE(watchdog_list, tout, &i);
737}
738
739static void
740db_gdb(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
741{
742
743	if (kdb_dbbe_select("gdb") != 0) {
744		db_printf("The remote GDB backend could not be selected.\n");
745		return;
746	}
747	/*
748	 * Mark that we are done in the debugger.  kdb_trap()
749	 * should re-enter with the new backend.
750	 */
751	db_cmd_loop_done = 1;
752	db_printf("(ctrl-c will return control to ddb)\n");
753}
754
755static void
756db_stack_trace(db_expr_t tid, bool hastid, db_expr_t count, char *modif)
757{
758	struct thread *td;
759	db_expr_t radix;
760	pid_t pid;
761	int t;
762
763	/*
764	 * We parse our own arguments. We don't like the default radix.
765	 */
766	radix = db_radix;
767	db_radix = 10;
768	hastid = db_expression(&tid);
769	t = db_read_token();
770	if (t == tCOMMA) {
771		if (!db_expression(&count)) {
772			db_printf("Count missing\n");
773			db_flush_lex();
774			return;
775		}
776	} else {
777		db_unread_token(t);
778		count = -1;
779	}
780	db_skip_to_eol();
781	db_radix = radix;
782
783	if (hastid) {
784		td = kdb_thr_lookup((lwpid_t)tid);
785		if (td == NULL)
786			td = kdb_thr_from_pid((pid_t)tid);
787		if (td == NULL) {
788			db_printf("Thread %d not found\n", (int)tid);
789			return;
790		}
791	} else
792		td = kdb_thread;
793	if (td->td_proc != NULL)
794		pid = td->td_proc->p_pid;
795	else
796		pid = -1;
797	db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td);
798	db_trace_thread(td, count);
799}
800
801static void
802db_stack_trace_all(db_expr_t dummy, bool dummy2, db_expr_t dummy3,
803    char *dummy4)
804{
805	struct proc *p;
806	struct thread *td;
807	jmp_buf jb;
808	void *prev_jb;
809
810	FOREACH_PROC_IN_SYSTEM(p) {
811		prev_jb = kdb_jmpbuf(jb);
812		if (setjmp(jb) == 0) {
813			FOREACH_THREAD_IN_PROC(p, td) {
814				db_printf("\nTracing command %s pid %d tid %ld td %p\n",
815					  p->p_comm, p->p_pid, (long)td->td_tid, td);
816				db_trace_thread(td, -1);
817				if (db_pager_quit) {
818					kdb_jmpbuf(prev_jb);
819					return;
820				}
821			}
822		}
823		kdb_jmpbuf(prev_jb);
824	}
825}
826
827/*
828 * Take the parsed expression value from the command line that was parsed
829 * as a hexadecimal value and convert it as if the expression was parsed
830 * as a decimal value.  Returns -1 if the expression was not a valid
831 * decimal value.
832 */
833db_expr_t
834db_hex2dec(db_expr_t expr)
835{
836	uintptr_t x, y;
837	db_expr_t val;
838
839	y = 1;
840	val = 0;
841	x = expr;
842	while (x != 0) {
843		if (x % 16 > 9)
844			return (-1);
845		val += (x % 16) * (y);
846		x >>= 4;
847		y *= 10;
848	}
849	return (val);
850}
851