1/*-
2 * Copyright (c) 2000, 2002, 2006, 2007, 2009, 2013 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
15 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
16 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__KERNEL_RCSID(0, "$NetBSD: db_panic.c,v 1.3 2014/01/22 15:20:40 christos Exp $");
29
30#include <sys/types.h>
31#include <sys/cpu.h>
32
33#include <ddb/ddbvar.h>
34#include <ddb/ddb.h>
35
36/*
37 * db_panic: Called by panic(). May print a stack trace; may enter the
38 * kernel debugger; may just return so that panic() will continue to
39 * halt or reboot the system.
40 */
41void db_panic(void)
42{
43
44 if (db_onpanic == 1)
45 Debugger();
46 else if (db_onpanic >= 0) {
47 static int intrace = 0;
48
49 if (intrace == 0) {
50 intrace = 1;
51 printf("cpu%u: Begin traceback...\n",
52 cpu_index(curcpu()));
53 db_stack_trace_print(
54 (db_expr_t)(intptr_t)__builtin_frame_address(0),
55 true, 65535, "", printf);
56 printf("cpu%u: End traceback...\n",
57 cpu_index(curcpu()));
58 intrace = 0;
59 } else
60 printf("Faulted in mid-traceback; aborting...\n");
61 if (db_onpanic == 2)
62 Debugger();
63 }
64 return;
65}
66