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

/*
 * Copyright (c) 2011 Jared D. McNeill <jmcneill@invisible.ca>
 * 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;
}