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