/*      $OpenBSD: kern_xxx.c,v 1.42 2025/06/16 20:21:33 kettenis Exp $  */
/*      $NetBSD: kern_xxx.c,v 1.32 1996/04/22 01:38:41 christos Exp $   */

/*
 * Copyright (c) 1982, 1986, 1989, 1993
 *      The Regents of the University of California.  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. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *      @(#)kern_xxx.c  8.2 (Berkeley) 11/14/93
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/signalvar.h>
#include <sys/syscallargs.h>
#include <sys/task.h>

int rebooting = 0;

int
sys_reboot(struct proc *p, void *v, register_t *retval)
{
        struct sys_reboot_args /* {
                syscallarg(int) opt;
        } */ *uap = v;
        int error;

        if ((error = suser(p)) != 0)
                return (error);

#ifdef MULTIPROCESSOR
        sched_stop_secondary_cpus();
        KASSERT(CPU_IS_PRIMARY(curcpu()));
#endif
        reboot(SCARG(uap, opt));
        /* NOTREACHED */
        return (0);
}

__dead void
reboot(int howto)
{
        KASSERT((howto & RB_NOSYNC) || curproc != NULL);

        stop_periodic_resettodr();

        rebooting = 1;

        boot(howto);
        /* NOTREACHED */
}

void
do_powerdown(void *arg)
{
        extern int allowpowerdown;

        if (allowpowerdown == 1) {
                allowpowerdown = 0;
                prsignal(initprocess, SIGUSR2);
        }
}

struct task powerdown_task = TASK_INITIALIZER(do_powerdown, NULL);

void
powerbutton_event(void)
{
#ifdef SUSPEND
        if (resuming())
                return;
#endif

        task_add(systq, &powerdown_task);
}

#if !defined(NO_PROPOLICE) && !defined(_RET_PROTECTOR)
void __stack_smash_handler(char [], int __attribute__((unused)));

void
__stack_smash_handler(char func[], int damaged)
{
        panic("smashed stack in %s", func);
}
#endif

#ifdef SYSCALL_DEBUG
#include <sys/proc.h>
#include <sys/syscall.h>

#define SCDEBUG_CALLS           0x0001  /* show calls */
#define SCDEBUG_RETURNS         0x0002  /* show returns */
#define SCDEBUG_ALL             0x0004  /* even syscalls that are implemented */
#define SCDEBUG_SHOWARGS        0x0008  /* show arguments to calls */

int     scdebug = SCDEBUG_CALLS|SCDEBUG_RETURNS|SCDEBUG_SHOWARGS;

extern const char *const syscallnames[];

void
scdebug_call(struct proc *p, register_t code, const register_t args[])
{
        struct process *pr;
        int i;

        if (!(scdebug & SCDEBUG_CALLS))
                return;

        if (!(scdebug & SCDEBUG_ALL || code < 0 || code >= SYS_MAXSYSCALL ||
             sysent[code].sy_call == sys_nosys))
                return;

        pr = p->p_p;
        printf("proc %d (%s): num ", pr->ps_pid, pr->ps_comm);
        if (code < 0 || code >= SYS_MAXSYSCALL)
                printf("OUT OF RANGE (%ld)", code);
        else {
                printf("%ld call: %s", code, syscallnames[code]);
                if (scdebug & SCDEBUG_SHOWARGS) {
                        printf("(");
                        for (i = 0; i < sysent[code].sy_argsize / sizeof(register_t);
                            i++)
                                printf("%s0x%lx", i == 0 ? "" : ", ", args[i]);
                        printf(")");
                }
        }
        printf("\n");
}

void
scdebug_ret(struct proc *p, register_t code, int error,
    const register_t retval[])
{
        struct process *pr;

        if (!(scdebug & SCDEBUG_RETURNS))
                return;

        if (!(scdebug & SCDEBUG_ALL || code < 0 || code >= SYS_MAXSYSCALL ||
            sysent[code].sy_call == sys_nosys))
                return;

        pr = p->p_p;
        printf("proc %d (%s): num ", pr->ps_pid, pr->ps_comm);
        if (code < 0 || code >= SYS_MAXSYSCALL)
                printf("OUT OF RANGE (%ld)", code);
        else if (code == SYS_lseek)
                printf("%ld ret: err = %d, rv = 0x%llx", code,
                    error, *(off_t *)retval);
        else
                printf("%ld ret: err = %d, rv = 0x%lx", code,
                    error, *retval);
        printf("\n");
}
#endif /* SYSCALL_DEBUG */