1 /* $NetBSD: vm_43.c,v 1.21 2019/01/27 02:08:39 pgoyette 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 1.21 2019/01/27 02:08:39 pgoyette Exp $"); 47 48 #if defined(_KERNEL_OPT) 49 #include "opt_compat_netbsd.h" 50 #endif 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/filedesc.h> 55 #include <sys/resourcevar.h> 56 #include <sys/proc.h> 57 #include <sys/vnode.h> 58 #include <sys/file.h> 59 #include <sys/mman.h> 60 61 #include <sys/syscall.h> 62 #include <sys/syscallvar.h> 63 #include <sys/syscallargs.h> 64 65 #include <miscfs/specfs/specdev.h> 66 67 #include <compat/common/compat_mod.h> 68 69 static struct syscall_package vm_43_syscalls[] = { 70 { SYS_compat_43_ogetpagesize, 0, 71 (sy_call_t *)compat_43_sys_getpagesize }, 72 { SYS_compat_43_ommap, 0, (sy_call_t *)compat_43_sys_mmap }, 73 { 0, 0, NULL } 74 }; 75 76 /* ARGSUSED */ 77 int 78 compat_43_sys_getpagesize(struct lwp *l, const void *v, register_t *retval) 79 { 80 81 *retval = PAGE_SIZE; 82 return (0); 83 } 84 85 int 86 compat_43_sys_mmap(struct lwp *l, const struct compat_43_sys_mmap_args *uap, register_t *retval) 87 { 88 /* { 89 syscallarg(void *) addr; 90 syscallarg(size_t) len; 91 syscallarg(int) prot; 92 syscallarg(int) flags; 93 syscallarg(int) fd; 94 syscallarg(long) pos; 95 } */ 96 struct sys_mmap_args /* { 97 syscallarg(void *) addr; 98 syscallarg(size_t) len; 99 syscallarg(int) prot; 100 syscallarg(int) flags; 101 syscallarg(int) fd; 102 syscallarg(long) pad; 103 syscallarg(off_t) pos; 104 } */ nargs; 105 static const char cvtbsdprot[8] = { 106 0, 107 PROT_EXEC, 108 PROT_WRITE, 109 PROT_EXEC|PROT_WRITE, 110 PROT_READ, 111 PROT_EXEC|PROT_READ, 112 PROT_WRITE|PROT_READ, 113 PROT_EXEC|PROT_WRITE|PROT_READ, 114 }; 115 #define OMAP_ANON 0x0002 116 #define OMAP_COPY 0x0020 117 #define OMAP_SHARED 0x0010 118 #define OMAP_FIXED 0x0100 119 #define OMAP_INHERIT 0x0800 120 121 SCARG(&nargs, addr) = SCARG(uap, addr); 122 SCARG(&nargs, len) = SCARG(uap, len); 123 /* Note: index using prot is sign-safe due to mask */ 124 SCARG(&nargs, prot) = cvtbsdprot[SCARG(uap, prot)&0x7]; 125 SCARG(&nargs, flags) = 0; 126 if (SCARG(uap, flags) & OMAP_ANON) 127 SCARG(&nargs, flags) |= MAP_ANON; 128 if (SCARG(uap, flags) & OMAP_SHARED) 129 SCARG(&nargs, flags) |= MAP_SHARED; 130 else 131 SCARG(&nargs, flags) |= MAP_PRIVATE; 132 if (SCARG(uap, flags) & OMAP_COPY) { 133 SCARG(&nargs, flags) |= MAP_PRIVATE; 134 #if defined(COMPAT_10) && defined(__i386__) 135 /* 136 * Ancient kernel on x86 did not obey PROT_EXEC on i386 at least 137 * and ld.so did not turn it on. We take care of this on amd64 138 * in compat32. 139 */ 140 SCARG(&nargs, prot) |= PROT_EXEC; 141 #endif 142 } 143 if (SCARG(uap, flags) & OMAP_FIXED) 144 SCARG(&nargs, flags) |= MAP_FIXED; 145 if (SCARG(uap, flags) & OMAP_INHERIT) 146 SCARG(&nargs, flags) |= MAP_INHERIT; 147 SCARG(&nargs, fd) = SCARG(uap, fd); 148 SCARG(&nargs, pos) = SCARG(uap, pos); 149 return (sys_mmap(l, &nargs, retval)); 150 } 151 152 int 153 vm_43_init(void) 154 { 155 156 return syscall_establish(NULL, vm_43_syscalls); 157 } 158 159 int 160 vm_43_fini(void) 161 { 162 163 return syscall_disestablish(NULL, vm_43_syscalls); 164 } 165