/* $NetBSD: panic.c,v 1.2 2021/06/21 03:08:07 christos Exp $ */

/*
* Copyright (c) 2011 Jared D. McNeill <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: panic.c,v 1.2 2021/06/21 03:08:07 christos Exp $");

#include <sys/module.h>

MODULE(MODULE_CLASS_MISC, panic, NULL);

static void
panic_dopanic(void)
{
       /* just call panic */
       panic("oops");
}

static void
panic_donullptr(void)
{
       /* null ptr dereference */
       *(int *)NULL = 1;
}

static const struct {
       const char *name;
       void (*func)(void);
} panic_howto[] = {
       { "panic",      panic_dopanic },
       { "nullptr",    panic_donullptr },
};

static int
panic_modcmd(modcmd_t cmd, void *opaque)
{
       if (cmd == MODULE_CMD_INIT) {
               prop_dictionary_t props = opaque;
               const char *how = NULL;
               unsigned int i;

               if (props)
                       prop_dictionary_get_string(props, "how", &how);
               if (how == NULL)
                       how = "panic";

               for (i = 0; i < __arraycount(panic_howto); i++) {
                       if (strcmp(how, panic_howto[i].name) == 0) {
                               panic_howto[i].func();
                               break;
                       }
               }
               if (i == __arraycount(panic_howto))
                       printf("%s: no how '%s'\n", __func__, how);
               else
                       printf("%s: how '%s' didn't panic?\n", __func__, how);

               return EINVAL;
       }

       return ENOTTY;
}