1 /* $NetBSD: panic.c,v 1.2 2021/06/21 03:08:07 christos Exp $ */
2
3 /*
4 * Copyright (c) 2011 Jared D. McNeill <jmcneill@invisible.ca>
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. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: panic.c,v 1.2 2021/06/21 03:08:07 christos Exp $");
30
31 #include <sys/module.h>
32
33 MODULE(MODULE_CLASS_MISC, panic, NULL);
34
35 static void
panic_dopanic(void)36 panic_dopanic(void)
37 {
38 /* just call panic */
39 panic("oops");
40 }
41
42 static void
panic_donullptr(void)43 panic_donullptr(void)
44 {
45 /* null ptr dereference */
46 *(int *)NULL = 1;
47 }
48
49 static const struct {
50 const char *name;
51 void (*func)(void);
52 } panic_howto[] = {
53 { "panic", panic_dopanic },
54 { "nullptr", panic_donullptr },
55 };
56
57 static int
panic_modcmd(modcmd_t cmd,void * opaque)58 panic_modcmd(modcmd_t cmd, void *opaque)
59 {
60 if (cmd == MODULE_CMD_INIT) {
61 prop_dictionary_t props = opaque;
62 const char *how = NULL;
63 unsigned int i;
64
65 if (props)
66 prop_dictionary_get_string(props, "how", &how);
67 if (how == NULL)
68 how = "panic";
69
70 for (i = 0; i < __arraycount(panic_howto); i++) {
71 if (strcmp(how, panic_howto[i].name) == 0) {
72 panic_howto[i].func();
73 break;
74 }
75 }
76 if (i == __arraycount(panic_howto))
77 printf("%s: no how '%s'\n", __func__, how);
78 else
79 printf("%s: how '%s' didn't panic?\n", __func__, how);
80
81 return EINVAL;
82 }
83
84 return ENOTTY;
85 }
86