| 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 | |