db_command.c revision 228569 
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 228569 2011-12-16 11:44:20Z kib $");
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 */
62boolean_t	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,	0 },
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,	0 },
91	{ "breaks",	db_listbreak_cmd, 	0,	0 },
92	{ "threads",	db_show_threads,	0,	0 },
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,	0 },
98	{ "p",		db_print_cmd,		0,	0 },
99	{ "examine",	db_examine_cmd,		CS_SET_DOT, 0 },
100	{ "x",		db_examine_cmd,		CS_SET_DOT, 0 },
101	{ "search",	db_search_cmd,		CS_OWN|CS_SET_DOT, 0 },
102	{ "set",	db_set_cmd,		CS_OWN,	0 },
103	{ "write",	db_write_cmd,		CS_MORE|CS_SET_DOT, 0 },
104	{ "w",		db_write_cmd,		CS_MORE|CS_SET_DOT, 0 },
105	{ "delete",	db_delete_cmd,		0,	0 },
106	{ "d",		db_delete_cmd,		0,	0 },
107	{ "dump",	db_dump,		0,	0 },
108	{ "break",	db_breakpoint_cmd,	0,	0 },
109	{ "b",		db_breakpoint_cmd,	0,	0 },
110	{ "dwatch",	db_deletewatch_cmd,	0,	0 },
111	{ "watch",	db_watchpoint_cmd,	CS_MORE,0 },
112	{ "dhwatch",	db_deletehwatch_cmd,	0,      0 },
113	{ "hwatch",	db_hwatchpoint_cmd,	0,      0 },
114	{ "step",	db_single_step_cmd,	0,	0 },
115	{ "s",		db_single_step_cmd,	0,	0 },
116	{ "continue",	db_continue_cmd,	0,	0 },
117	{ "c",		db_continue_cmd,	0,	0 },
118	{ "until",	db_trace_until_call_cmd,0,	0 },
119	{ "next",	db_trace_until_matching_cmd,0,	0 },
120	{ "match",	db_trace_until_matching_cmd,0,	0 },
121	{ "trace",	db_stack_trace,		CS_OWN,	0 },
122	{ "t",		db_stack_trace,		CS_OWN,	0 },
123	/* XXX alias for all trace */
124	{ "alltrace",	db_stack_trace_all,	0,	0 },
125	{ "where",	db_stack_trace,		CS_OWN,	0 },
126	{ "bt",		db_stack_trace,		CS_OWN,	0 },
127	{ "call",	db_fncall,		CS_OWN,	0 },
128	{ "show",	0,			0,	&db_show_table },
129	{ "ps",		db_ps,			0,	0 },
130	{ "gdb",	db_gdb,			0,	0 },
131	{ "halt",	db_halt,		0,	0 },
132	{ "reboot",	db_reset,		0,	0 },
133	{ "reset",	db_reset,		0,	0 },
134	{ "kill",	db_kill,		CS_OWN,	0 },
135	{ "watchdog",	db_watchdog,		CS_OWN,	0 },
136	{ "thread",	db_set_thread,		CS_OWN,	0 },
137	{ "run",	db_run_cmd,		CS_OWN,	0 },
138	{ "script",	db_script_cmd,		CS_OWN,	0 },
139	{ "scripts",	db_scripts_cmd,		0,	0 },
140	{ "unscript",	db_unscript_cmd,	CS_OWN,	0 },
141	{ "capture",	db_capture_cmd,		CS_OWN,	0 },
142	{ "textdump",	db_textdump_cmd,	CS_OWN, 0 },
143	{ "findstack",	db_findstack_cmd,	0,	0 },
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 boolean_t	db_ed_style = TRUE;
155
156/*
157 * Utility routine - discard tokens through end-of-line.
158 */
159void
160db_skip_to_eol()
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(name, cmd, cmdp, resultp)
256	char *		name;
257	struct command	*cmd;
258	struct command	**cmdp;	/* out */
259	int *		resultp;
260{
261	char *lp, *rp;
262	int c;
263
264	lp = name;
265	rp = cmd->name;
266	while ((c = *lp) == *rp) {
267		if (c == 0) {
268			/* complete match */
269			*cmdp = cmd;
270			*resultp = CMD_UNIQUE;
271			return;
272		}
273		lp++;
274		rp++;
275	}
276	if (c == 0) {
277		/* end of name, not end of command -
278		   partial match */
279		if (*resultp == CMD_FOUND) {
280			*resultp = CMD_AMBIGUOUS;
281			/* but keep looking for a full match -
282			   this lets us match single letters */
283		} else {
284			*cmdp = cmd;
285			*resultp = CMD_FOUND;
286		}
287	}
288}
289
290/*
291 * Search for command prefix.
292 */
293static int
294db_cmd_search(name, table, cmdp)
295	char *		name;
296	struct command_table *table;
297	struct command	**cmdp;	/* out */
298{
299	struct command	*cmd;
300	int		result = CMD_NONE;
301
302	LIST_FOREACH(cmd, table, next) {
303		db_cmd_match(name,cmd,cmdp,&result);
304		if (result == CMD_UNIQUE)
305			break;
306	}
307
308	if (result == CMD_NONE) {
309		/* check for 'help' */
310		if (name[0] == 'h' && name[1] == 'e'
311		    && name[2] == 'l' && name[3] == 'p')
312			result = CMD_HELP;
313	}
314	return (result);
315}
316
317static void
318db_cmd_list(table)
319	struct command_table *table;
320{
321	register struct command	*cmd;
322
323	LIST_FOREACH(cmd, table, next) {
324		db_printf("%-12s", cmd->name);
325		db_end_line(12);
326	}
327}
328
329static void
330db_command(last_cmdp, cmd_table, dopager)
331	struct command	**last_cmdp;	/* IN_OUT */
332	struct command_table *cmd_table;
333	int dopager;
334{
335	struct command	*cmd = NULL;
336	int		t;
337	char		modif[TOK_STRING_SIZE];
338	db_expr_t	addr, count;
339	boolean_t	have_addr = FALSE;
340	int		result;
341
342	t = db_read_token();
343	if (t == tEOL) {
344	    /* empty line repeats last command, at 'next' */
345	    cmd = *last_cmdp;
346	    addr = (db_expr_t)db_next;
347	    have_addr = FALSE;
348	    count = 1;
349	    modif[0] = '\0';
350	}
351	else if (t == tEXCL) {
352	    db_fncall((db_expr_t)0, (boolean_t)0, (db_expr_t)0, (char *)0);
353	    return;
354	}
355	else if (t != tIDENT) {
356	    db_printf("?\n");
357	    db_flush_lex();
358	    return;
359	}
360	else {
361	    /*
362	     * Search for command
363	     */
364	    while (cmd_table) {
365		result = db_cmd_search(db_tok_string,
366				       cmd_table,
367				       &cmd);
368		switch (result) {
369		    case CMD_NONE:
370			db_printf("No such command\n");
371			db_flush_lex();
372			return;
373		    case CMD_AMBIGUOUS:
374			db_printf("Ambiguous\n");
375			db_flush_lex();
376			return;
377		    case CMD_HELP:
378			db_cmd_list(cmd_table);
379			db_flush_lex();
380			return;
381		    default:
382			break;
383		}
384		if ((cmd_table = cmd->more) != NULL) {
385		    t = db_read_token();
386		    if (t != tIDENT) {
387			db_cmd_list(cmd_table);
388			db_flush_lex();
389			return;
390		    }
391		}
392	    }
393
394	    if ((cmd->flag & CS_OWN) == 0) {
395		/*
396		 * Standard syntax:
397		 * command [/modifier] [addr] [,count]
398		 */
399		t = db_read_token();
400		if (t == tSLASH) {
401		    t = db_read_token();
402		    if (t != tIDENT) {
403			db_printf("Bad modifier\n");
404			db_flush_lex();
405			return;
406		    }
407		    db_strcpy(modif, db_tok_string);
408		}
409		else {
410		    db_unread_token(t);
411		    modif[0] = '\0';
412		}
413
414		if (db_expression(&addr)) {
415		    db_dot = (db_addr_t) addr;
416		    db_last_addr = db_dot;
417		    have_addr = TRUE;
418		}
419		else {
420		    addr = (db_expr_t) db_dot;
421		    have_addr = FALSE;
422		}
423		t = db_read_token();
424		if (t == tCOMMA) {
425		    if (!db_expression(&count)) {
426			db_printf("Count missing\n");
427			db_flush_lex();
428			return;
429		    }
430		}
431		else {
432		    db_unread_token(t);
433		    count = -1;
434		}
435		if ((cmd->flag & CS_MORE) == 0) {
436		    db_skip_to_eol();
437		}
438	    }
439	}
440	*last_cmdp = cmd;
441	if (cmd != 0) {
442	    /*
443	     * Execute the command.
444	     */
445	    if (dopager)
446		db_enable_pager();
447	    else
448		db_disable_pager();
449	    (*cmd->fcn)(addr, have_addr, count, modif);
450	    if (dopager)
451		db_disable_pager();
452
453	    if (cmd->flag & CS_SET_DOT) {
454		/*
455		 * If command changes dot, set dot to
456		 * previous address displayed (if 'ed' style).
457		 */
458		if (db_ed_style) {
459		    db_dot = db_prev;
460		}
461		else {
462		    db_dot = db_next;
463		}
464	    }
465	    else {
466		/*
467		 * If command does not change dot,
468		 * set 'next' location to be the same.
469		 */
470		db_next = db_dot;
471	    }
472	}
473}
474
475/*
476 * At least one non-optional command must be implemented using
477 * DB_COMMAND() so that db_cmd_set gets created.  Here is one.
478 */
479DB_COMMAND(panic, db_panic)
480{
481	db_disable_pager();
482	panic("from debugger");
483}
484
485void
486db_command_loop()
487{
488	/*
489	 * Initialize 'prev' and 'next' to dot.
490	 */
491	db_prev = db_dot;
492	db_next = db_dot;
493
494	db_cmd_loop_done = 0;
495	while (!db_cmd_loop_done) {
496	    if (db_print_position() != 0)
497		db_printf("\n");
498
499	    db_printf("db> ");
500	    (void) db_read_line();
501
502	    db_command(&db_last_command, &db_cmd_table, /* dopager */ 1);
503	}
504}
505
506/*
507 * Execute a command on behalf of a script.  The caller is responsible for
508 * making sure that the command string is < DB_MAXLINE or it will be
509 * truncated.
510 *
511 * XXXRW: Runs by injecting faked input into DDB input stream; it would be
512 * nicer to use an alternative approach that didn't mess with the previous
513 * command buffer.
514 */
515void
516db_command_script(const char *command)
517{
518	db_prev = db_next = db_dot;
519	db_inject_line(command);
520	db_command(&db_last_command, &db_cmd_table, /* dopager */ 0);
521}
522
523void
524db_error(s)
525	const char *s;
526{
527	if (s)
528	    db_printf("%s", s);
529	db_flush_lex();
530	kdb_reenter();
531}
532
533static void
534db_dump(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
535{
536	int error;
537
538	error = doadump(FALSE);
539	if (error) {
540		db_printf("Cannot dump: ");
541		switch (error) {
542		case EBUSY:
543			db_printf("debugger got invoked while dumping.\n");
544			break;
545		case ENXIO:
546			db_printf("no dump device specified.\n");
547			break;
548		default:
549			db_printf("unknown error (error=%d).\n", error);
550			break;
551		}
552	}
553}
554
555/*
556 * Call random function:
557 * !expr(arg,arg,arg)
558 */
559
560/* The generic implementation supports a maximum of 10 arguments. */
561typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t,
562    db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t);
563
564static __inline int
565db_fncall_generic(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[])
566{
567	__db_f *f = (__db_f *)addr;
568
569	if (nargs > 10) {
570		db_printf("Too many arguments (max 10)\n");
571		return (0);
572	}
573	*rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5],
574	    args[6], args[7], args[8], args[9]);
575	return (1);
576}
577
578static void
579db_fncall(dummy1, dummy2, dummy3, dummy4)
580	db_expr_t	dummy1;
581	boolean_t	dummy2;
582	db_expr_t	dummy3;
583	char *		dummy4;
584{
585	db_expr_t	fn_addr;
586	db_expr_t	args[DB_MAXARGS];
587	int		nargs = 0;
588	db_expr_t	retval;
589	int		t;
590
591	if (!db_expression(&fn_addr)) {
592	    db_printf("Bad function\n");
593	    db_flush_lex();
594	    return;
595	}
596
597	t = db_read_token();
598	if (t == tLPAREN) {
599	    if (db_expression(&args[0])) {
600		nargs++;
601		while ((t = db_read_token()) == tCOMMA) {
602		    if (nargs == DB_MAXARGS) {
603			db_printf("Too many arguments (max %d)\n", DB_MAXARGS);
604			db_flush_lex();
605			return;
606		    }
607		    if (!db_expression(&args[nargs])) {
608			db_printf("Argument missing\n");
609			db_flush_lex();
610			return;
611		    }
612		    nargs++;
613		}
614		db_unread_token(t);
615	    }
616	    if (db_read_token() != tRPAREN) {
617		db_printf("?\n");
618		db_flush_lex();
619		return;
620	    }
621	}
622	db_skip_to_eol();
623	db_disable_pager();
624
625	if (DB_CALL(fn_addr, &retval, nargs, args))
626		db_printf("= %#lr\n", (long)retval);
627}
628
629static void
630db_halt(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
631{
632
633	cpu_halt();
634}
635
636static void
637db_kill(dummy1, dummy2, dummy3, dummy4)
638	db_expr_t	dummy1;
639	boolean_t	dummy2;
640	db_expr_t	dummy3;
641	char *		dummy4;
642{
643	db_expr_t old_radix, pid, sig;
644	struct proc *p;
645
646#define DB_ERROR(f)	do { db_printf f; db_flush_lex(); goto out; } while (0)
647
648	/*
649	 * PIDs and signal numbers are typically represented in base
650	 * 10, so make that the default here.  It can, of course, be
651	 * overridden by specifying a prefix.
652	 */
653	old_radix = db_radix;
654	db_radix = 10;
655	/* Retrieve arguments. */
656	if (!db_expression(&sig))
657		DB_ERROR(("Missing signal number\n"));
658	if (!db_expression(&pid))
659		DB_ERROR(("Missing process ID\n"));
660	db_skip_to_eol();
661	if (!_SIG_VALID(sig))
662		DB_ERROR(("Signal number out of range\n"));
663
664	/*
665	 * Find the process in question.  allproc_lock is not needed
666	 * since we're in DDB.
667	 */
668	/* sx_slock(&allproc_lock); */
669	FOREACH_PROC_IN_SYSTEM(p)
670	    if (p->p_pid == pid)
671		    break;
672	/* sx_sunlock(&allproc_lock); */
673	if (p == NULL)
674		DB_ERROR(("Can't find process with pid %ld\n", (long) pid));
675
676	/* If it's already locked, bail; otherwise, do the deed. */
677	if (PROC_TRYLOCK(p) == 0)
678		DB_ERROR(("Can't lock process with pid %ld\n", (long) pid));
679	else {
680		pksignal(p, sig, NULL);
681		PROC_UNLOCK(p);
682	}
683
684out:
685	db_radix = old_radix;
686#undef DB_ERROR
687}
688
689/*
690 * Reboot.  In case there is an additional argument, take it as delay in
691 * seconds.  Default to 15s if we cannot parse it and make sure we will
692 * never wait longer than 1 week.  Some code is similar to
693 * kern_shutdown.c:shutdown_panic().
694 */
695#ifndef	DB_RESET_MAXDELAY
696#define	DB_RESET_MAXDELAY	(3600 * 24 * 7)
697#endif
698
699static void
700db_reset(db_expr_t addr, boolean_t have_addr, db_expr_t count __unused,
701    char *modif __unused)
702{
703	int delay, loop;
704
705	if (have_addr) {
706		delay = (int)db_hex2dec(addr);
707
708		/* If we parse to fail, use 15s. */
709		if (delay == -1)
710			delay = 15;
711
712		/* Cap at one week. */
713		if ((uintmax_t)delay > (uintmax_t)DB_RESET_MAXDELAY)
714			delay = DB_RESET_MAXDELAY;
715
716		db_printf("Automatic reboot in %d seconds - "
717		    "press a key on the console to abort\n", delay);
718		for (loop = delay * 10; loop > 0; --loop) {
719			DELAY(1000 * 100); /* 1/10th second */
720			/* Did user type a key? */
721			if (cncheckc() != -1)
722				return;
723		}
724	}
725
726	cpu_reset();
727}
728
729static void
730db_watchdog(dummy1, dummy2, dummy3, dummy4)
731	db_expr_t	dummy1;
732	boolean_t	dummy2;
733	db_expr_t	dummy3;
734	char *		dummy4;
735{
736	db_expr_t old_radix, tout;
737	int err, i;
738
739	old_radix = db_radix;
740	db_radix = 10;
741	err = db_expression(&tout);
742	db_skip_to_eol();
743	db_radix = old_radix;
744
745	/* If no argument is provided the watchdog will just be disabled. */
746	if (err == 0) {
747		db_printf("No argument provided, disabling watchdog\n");
748		tout = 0;
749	} else if ((tout & WD_INTERVAL) == WD_TO_NEVER) {
750		db_error("Out of range watchdog interval\n");
751		return;
752	}
753	EVENTHANDLER_INVOKE(watchdog_list, tout, &i);
754}
755
756static void
757db_gdb(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
758{
759
760	if (kdb_dbbe_select("gdb") != 0) {
761		db_printf("The remote GDB backend could not be selected.\n");
762		return;
763	}
764	/*
765	 * Mark that we are done in the debugger.  kdb_trap()
766	 * should re-enter with the new backend.
767	 */
768	db_cmd_loop_done = 1;
769	db_printf("(ctrl-c will return control to ddb)\n");
770}
771
772static void
773db_stack_trace(db_expr_t tid, boolean_t hastid, db_expr_t count, char *modif)
774{
775	struct thread *td;
776	db_expr_t radix;
777	pid_t pid;
778	int t;
779
780	/*
781	 * We parse our own arguments. We don't like the default radix.
782	 */
783	radix = db_radix;
784	db_radix = 10;
785	hastid = db_expression(&tid);
786	t = db_read_token();
787	if (t == tCOMMA) {
788		if (!db_expression(&count)) {
789			db_printf("Count missing\n");
790			db_flush_lex();
791			return;
792		}
793	} else {
794		db_unread_token(t);
795		count = -1;
796	}
797	db_skip_to_eol();
798	db_radix = radix;
799
800	if (hastid) {
801		td = kdb_thr_lookup((lwpid_t)tid);
802		if (td == NULL)
803			td = kdb_thr_from_pid((pid_t)tid);
804		if (td == NULL) {
805			db_printf("Thread %d not found\n", (int)tid);
806			return;
807		}
808	} else
809		td = kdb_thread;
810	if (td->td_proc != NULL)
811		pid = td->td_proc->p_pid;
812	else
813		pid = -1;
814	db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td);
815	db_trace_thread(td, count);
816}
817
818static void
819db_stack_trace_all(db_expr_t dummy, boolean_t dummy2, db_expr_t dummy3,
820    char *dummy4)
821{
822	struct proc *p;
823	struct thread *td;
824	jmp_buf jb;
825	void *prev_jb;
826
827	FOREACH_PROC_IN_SYSTEM(p) {
828		prev_jb = kdb_jmpbuf(jb);
829		if (setjmp(jb) == 0) {
830			FOREACH_THREAD_IN_PROC(p, td) {
831				db_printf("\nTracing command %s pid %d tid %ld td %p\n",
832					  p->p_comm, p->p_pid, (long)td->td_tid, td);
833				db_trace_thread(td, -1);
834				if (db_pager_quit) {
835					kdb_jmpbuf(prev_jb);
836					return;
837				}
838			}
839		}
840		kdb_jmpbuf(prev_jb);
841	}
842}
843
844/*
845 * Take the parsed expression value from the command line that was parsed
846 * as a hexadecimal value and convert it as if the expression was parsed
847 * as a decimal value.  Returns -1 if the expression was not a valid
848 * decimal value.
849 */
850db_expr_t
851db_hex2dec(db_expr_t expr)
852{
853	uintptr_t x, y;
854	db_expr_t val;
855
856	y = 1;
857	val = 0;
858	x = expr;
859	while (x != 0) {
860		if (x % 16 > 9)
861			return (-1);
862		val += (x % 16) * (y);
863		x >>= 4;
864		y *= 10;
865	}
866	return (val);
867}
868