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
compat_43_sys_getpagesize(struct lwp * l,const void * v,register_t * retval)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
compat_43_sys_mmap(struct lwp * l,const struct compat_43_sys_mmap_args * uap,register_t * retval)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