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vm_43.c revision 1.18 
      1 /*	$NetBSD: vm_43.c,v 1.18 2011/02/08 20:20:26 rmind Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1991, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
     37  *
     38  *	@(#)vm_mmap.c	8.5 (Berkeley) 5/19/94
     39  */
     40 
     41 /*
     42  * Mapped file (mmap) interface to VM
     43  */
     44 
     45 #include <sys/cdefs.h>
     46 __KERNEL_RCSID(0, "$NetBSD: vm_43.c,v 1.18 2011/02/08 20:20:26 rmind Exp $");
     47 
     48 #include <sys/param.h>
     49 #include <sys/systm.h>
     50 #include <sys/filedesc.h>
     51 #include <sys/resourcevar.h>
     52 #include <sys/proc.h>
     53 #include <sys/vnode.h>
     54 #include <sys/file.h>
     55 #include <sys/mman.h>
     56 
     57 #include <sys/syscallargs.h>
     58 
     59 #include <miscfs/specfs/specdev.h>
     60 
     61 /* ARGSUSED */
     62 int
     63 compat_43_sys_getpagesize(struct lwp *l, const void *v, register_t *retval)
     64 {
     65 
     66 	*retval = PAGE_SIZE;
     67 	return (0);
     68 }
     69 
     70 int
     71 compat_43_sys_mmap(struct lwp *l, const struct compat_43_sys_mmap_args *uap, register_t *retval)
     72 {
     73 	/* {
     74 		syscallarg(void *) addr;
     75 		syscallarg(size_t) len;
     76 		syscallarg(int) prot;
     77 		syscallarg(int) flags;
     78 		syscallarg(int) fd;
     79 		syscallarg(long) pos;
     80 	} */
     81 	struct sys_mmap_args /* {
     82 		syscallarg(void *) addr;
     83 		syscallarg(size_t) len;
     84 		syscallarg(int) prot;
     85 		syscallarg(int) flags;
     86 		syscallarg(int) fd;
     87 		syscallarg(long) pad;
     88 		syscallarg(off_t) pos;
     89 	} */ nargs;
     90 	static const char cvtbsdprot[8] = {
     91 		0,
     92 		PROT_EXEC,
     93 		PROT_WRITE,
     94 		PROT_EXEC|PROT_WRITE,
     95 		PROT_READ,
     96 		PROT_EXEC|PROT_READ,
     97 		PROT_WRITE|PROT_READ,
     98 		PROT_EXEC|PROT_WRITE|PROT_READ,
     99 	};
    100 #define	OMAP_ANON	0x0002
    101 #define	OMAP_COPY	0x0020
    102 #define	OMAP_SHARED	0x0010
    103 #define	OMAP_FIXED	0x0100
    104 #define	OMAP_INHERIT	0x0800
    105 
    106 	SCARG(&nargs, addr) = SCARG(uap, addr);
    107 	SCARG(&nargs, len) = SCARG(uap, len);
    108 	/* Note: index using prot is sign-safe due to mask */
    109 	SCARG(&nargs, prot) = cvtbsdprot[SCARG(uap, prot)&0x7];
    110 	SCARG(&nargs, flags) = 0;
    111 	if (SCARG(uap, flags) & OMAP_ANON)
    112 		SCARG(&nargs, flags) |= MAP_ANON;
    113 	if (SCARG(uap, flags) & OMAP_COPY)
    114 		SCARG(&nargs, flags) |= MAP_COPY;
    115 	if (SCARG(uap, flags) & OMAP_SHARED)
    116 		SCARG(&nargs, flags) |= MAP_SHARED;
    117 	else
    118 		SCARG(&nargs, flags) |= MAP_PRIVATE;
    119 	if (SCARG(uap, flags) & OMAP_FIXED)
    120 		SCARG(&nargs, flags) |= MAP_FIXED;
    121 	if (SCARG(uap, flags) & OMAP_INHERIT)
    122 		SCARG(&nargs, flags) |= MAP_INHERIT;
    123 	SCARG(&nargs, fd) = SCARG(uap, fd);
    124 	SCARG(&nargs, pos) = SCARG(uap, pos);
    125 	return (sys_mmap(l, &nargs, retval));
    126 }
    127