1/*	$NetBSD: db_panic.c,v 1.12 2023/11/21 14:35:01 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2000, 2002, 2006, 2007, 2009, 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: db_panic.c,v 1.12 2023/11/21 14:35:01 riastradh Exp $");
31
32#include <sys/param.h>
33#include <sys/types.h>
34#include <sys/cpu.h>
35
36#include <ddb/ddbvar.h>
37#include <ddb/ddb.h>
38
39/*
40 * db_panic: Called by panic().  May print a stack trace; may enter the
41 * kernel debugger; may just return so that panic() will continue to
42 * halt or reboot the system.
43 */
44void
45db_panic(void)
46{
47
48	if (db_dumpstack > 0) {
49		static int intrace = 0;
50
51		if (intrace == 0) {
52			intrace = 1;
53			printf("cpu%u: Begin traceback...\n",
54			    cpu_index(curcpu()));
55			db_stack_trace_print_ra(
56			    (db_expr_t)(intptr_t)__builtin_return_address(0),
57			    true,
58			    (db_expr_t)(intptr_t)__builtin_frame_address(0),
59			    true, db_panicstackframes, "", printf);
60			printf("cpu%u: End traceback...\n",
61			    cpu_index(curcpu()));
62			intrace = 0;
63		} else
64			printf("Faulted in mid-traceback; aborting...\n");
65	}
66
67	if (db_onpanic > 0)
68		Debugger();
69
70	return;
71}
72