/*      $NetBSD: vm_43.c,v 1.21 2019/01/27 02:08:39 pgoyette Exp $      */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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.
 *
 * from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
 *
 *      @(#)vm_mmap.c   8.5 (Berkeley) 5/19/94
 */

/*
 * Mapped file (mmap) interface to VM
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vm_43.c,v 1.21 2019/01/27 02:08:39 pgoyette Exp $");

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

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/filedesc.h>
#include <sys/resourcevar.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/mman.h>

#include <sys/syscall.h>
#include <sys/syscallvar.h>
#include <sys/syscallargs.h>

#include <miscfs/specfs/specdev.h>

#include <compat/common/compat_mod.h>

static struct syscall_package vm_43_syscalls[] = {
        { SYS_compat_43_ogetpagesize, 0,
            (sy_call_t *)compat_43_sys_getpagesize },
        { SYS_compat_43_ommap, 0, (sy_call_t *)compat_43_sys_mmap },
        { 0, 0, NULL }
};

/* ARGSUSED */
int
compat_43_sys_getpagesize(struct lwp *l, const void *v, register_t *retval)
{

        *retval = PAGE_SIZE;
        return (0);
}

int
compat_43_sys_mmap(struct lwp *l, const struct compat_43_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) pos;
        } */
        struct sys_mmap_args /* {
                syscallarg(void *) addr;
                syscallarg(size_t) len;
                syscallarg(int) prot;
                syscallarg(int) flags;
                syscallarg(int) fd;
                syscallarg(long) pad;
                syscallarg(off_t) pos;
        } */ nargs;
        static const char cvtbsdprot[8] = {
                0,
                PROT_EXEC,
                PROT_WRITE,
                PROT_EXEC|PROT_WRITE,
                PROT_READ,
                PROT_EXEC|PROT_READ,
                PROT_WRITE|PROT_READ,
                PROT_EXEC|PROT_WRITE|PROT_READ,
        };
#define OMAP_ANON       0x0002
#define OMAP_COPY       0x0020
#define OMAP_SHARED     0x0010
#define OMAP_FIXED      0x0100
#define OMAP_INHERIT    0x0800

        SCARG(&nargs, addr) = SCARG(uap, addr);
        SCARG(&nargs, len) = SCARG(uap, len);
        /* Note: index using prot is sign-safe due to mask */
        SCARG(&nargs, prot) = cvtbsdprot[SCARG(uap, prot)&0x7];
        SCARG(&nargs, flags) = 0;
        if (SCARG(uap, flags) & OMAP_ANON)
                SCARG(&nargs, flags) |= MAP_ANON;
        if (SCARG(uap, flags) & OMAP_SHARED)
                SCARG(&nargs, flags) |= MAP_SHARED;
        else
                SCARG(&nargs, flags) |= MAP_PRIVATE;
        if (SCARG(uap, flags) & OMAP_COPY) {
                SCARG(&nargs, flags) |= MAP_PRIVATE;
#if defined(COMPAT_10) && defined(__i386__)
                /*
                 * Ancient kernel on x86 did not obey PROT_EXEC on i386 at least
                 * and ld.so did not turn it on. We take care of this on amd64
                 * in compat32.
                 */
                SCARG(&nargs, prot) |= PROT_EXEC;
#endif
        }
        if (SCARG(uap, flags) & OMAP_FIXED)
                SCARG(&nargs, flags) |= MAP_FIXED;
        if (SCARG(uap, flags) & OMAP_INHERIT)
                SCARG(&nargs, flags) |= MAP_INHERIT;
        SCARG(&nargs, fd) = SCARG(uap, fd);
        SCARG(&nargs, pos) = SCARG(uap, pos);
        return (sys_mmap(l, &nargs, retval));
}

int
vm_43_init(void)
{

        return syscall_establish(NULL, vm_43_syscalls);
}

int
vm_43_fini(void)
{

        return syscall_disestablish(NULL, vm_43_syscalls);
}