/*      $NetBSD: freebsd_misc.c,v 1.35 2026/01/02 22:22:22 nia Exp $    */

/*
 * Copyright (c) 1995 Frank van der Linden
 * 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. 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.
 */

/*
 * FreeBSD compatibility module. Try to deal with various FreeBSD system calls.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: freebsd_misc.c,v 1.35 2026/01/02 22:22:22 nia Exp $");

#if defined(_KERNEL_OPT)
#include "opt_ntp.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/mman.h>
#include <sys/ktrace.h>

#include <sys/syscallargs.h>

#include <compat/freebsd/freebsd_syscallargs.h>
#include <compat/common/compat_util.h>
#include <compat/freebsd/freebsd_rtprio.h>
#include <compat/freebsd/freebsd_timex.h>
#include <compat/freebsd/freebsd_signal.h>
#include <compat/freebsd/freebsd_mman.h>

int
freebsd_sys_msync(struct lwp *l, const struct freebsd_sys_msync_args *uap, register_t *retval)
{
        /* {
                syscallarg(void *) addr;
                syscallarg(size_t) len;
                syscallarg(int) flags;
        } */
        struct sys___msync13_args bma;

        /*
         * FreeBSD-2.0-RELEASE's msync(2) is compatible with NetBSD's.
         * FreeBSD-2.0.5-RELEASE's msync(2) has addtional argument `flags',
         * but syscall number is not changed. :-<
         */
        SCARG(&bma, addr) = SCARG(uap, addr);
        SCARG(&bma, len) = SCARG(uap, len);
        SCARG(&bma, flags) = SCARG(uap, flags);
        return sys___msync13(l, &bma, retval);
}

int
freebsd_sys_mmap(struct lwp *l, const struct freebsd_sys_mmap_args *uap, register_t *retval)
{
        /* {
                syscallarg(void *) addr;
                syscallarg(size_t) len;
                syscallarg(int) prot;
                syscallarg(int) flags;
                syscallarg(int) fd;
                syscallarg(long) pad;
                syscallarg(off_t) pos;
        } */
        struct sys_mmap_args bma;
        int flags, prot, fd;
        off_t pos;

        prot = SCARG(uap, prot);
        flags = SCARG(uap, flags);
        fd = SCARG(uap, fd);
        pos = SCARG(uap, pos);

        /*
         * If using MAP_STACK on FreeBSD:
         *
         * + fd has to be -1
         * + prot must have read and write
         * + MAP_STACK implies MAP_ANON
         * + MAP_STACK implies offset of 0
         */
        if (flags & FREEBSD_MAP_STACK) {
                if ((fd != -1)
                    ||((prot & (PROT_READ|PROT_WRITE))!=(PROT_READ|PROT_WRITE)))
                        return (EINVAL);

                flags |= (MAP_ANON | MAP_FIXED);
                flags &= ~FREEBSD_MAP_STACK;

                pos = 0;
        }

        SCARG(&bma, addr) = SCARG(uap, addr);
        SCARG(&bma, len) = SCARG(uap, len);
        SCARG(&bma, prot) = prot;
        SCARG(&bma, flags) = flags;
        SCARG(&bma, fd) = fd;
        SCARG(&bma, pos) = pos;

        return sys_mmap(l, &bma, retval);
}

/* just a place holder */

int
freebsd_sys_rtprio(struct lwp *l, const struct freebsd_sys_rtprio_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) function;
                syscallarg(pid_t) pid;
                syscallarg(struct freebsd_rtprio *) rtp;
        } */

        return ENOSYS;  /* XXX */
}

#ifdef NTP
int
freebsd_ntp_adjtime(struct lwp *l, const struct freebsd_ntp_adjtime_args *uap, register_t *retval)
{
        /* {
                syscallarg(struct freebsd_timex *) tp;
        } */

        return ENOSYS;  /* XXX */
}
#endif

int
freebsd_sys_sigaction4(struct lwp *l, const struct freebsd_sys_sigaction4_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) signum;
                syscallarg(const struct freebsd_sigaction4 *) nsa;
                syscallarg(struct freebsd_sigaction4 *) osa;
        } */
        struct freebsd_sigaction4 nesa, oesa;
        struct sigaction nbsa, obsa;
        int error;

        if (SCARG(uap, nsa)) {
                error = copyin(SCARG(uap, nsa), &nesa, sizeof(nesa));
                if (error)
                        return (error);
                nbsa.sa_handler = nesa.freebsd_sa_handler;
                nbsa.sa_mask    = nesa.freebsd_sa_mask;
                nbsa.sa_flags   = nesa.freebsd_sa_flags;
        }
        error = sigaction1(l, SCARG(uap, signum),
            SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0,
            NULL, 0);
        if (error)
                return (error);
        if (SCARG(uap, osa)) {
                memset(&oesa, 0, sizeof(oesa));
                oesa.freebsd_sa_handler = obsa.sa_handler;
                oesa.freebsd_sa_mask    = obsa.sa_mask;
                oesa.freebsd_sa_flags   = obsa.sa_flags;
                error = copyout(&oesa, SCARG(uap, osa), sizeof(oesa));
                if (error)
                        return (error);
        }
        return (0);
}

int
freebsd_sys_utrace(struct lwp *l, const struct freebsd_sys_utrace_args *uap, register_t *retval)
{
        /* {
                syscallarg(void *) addr;
                syscallarg(size_t) len;
        } */

        return ktruser("FreeBSD utrace", SCARG(uap, addr), SCARG(uap, len),
            0);
}