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 */
44 void
db_panic(void)45 db_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