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
compat_43_sys_getpagesize(struct lwp * l,const void * v,register_t * retval)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
compat_43_sys_mmap(struct lwp * l,const struct compat_43_sys_mmap_args * uap,register_t * retval)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
vm_43_init(void)153 vm_43_init(void)
154 {
155
156 return syscall_establish(NULL, vm_43_syscalls);
157 }
158
159 int
vm_43_fini(void)160 vm_43_fini(void)
161 {
162
163 return syscall_disestablish(NULL, vm_43_syscalls);
164 }
165