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vm_43.c revision 1.20.8.1 
      1 /*	$NetBSD: vm_43.c,v 1.20.8.1 2018/04/17 00:02:58 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 1.20.8.1 2018/04/17 00:02:58 pgoyette 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/syscall.h>
     58 #include <sys/syscallvar.h>
     59 #include <sys/syscallargs.h>
     60 
     61 #include <miscfs/specfs/specdev.h>
     62 
     63 #include <compat/common/compat_mod.h>
     64 
     65 static struct syscall_package vm_43_syscalls[] = {
     66 	{ SYS_compat_43_ogetpagesize, 0,
     67 	    (sy_call_t *)compat_43_sys_getpagesize },
     68 	{ SYS_compat_43_ommap, 0, (sy_call_t *)compat_43_sys_mmap },
     69 	{ 0, 0, NULL }
     70 };
     71 
     72 /* ARGSUSED */
     73 int
     74 compat_43_sys_getpagesize(struct lwp *l, const void *v, register_t *retval)
     75 {
     76 
     77 	*retval = PAGE_SIZE;
     78 	return (0);
     79 }
     80 
     81 int
     82 compat_43_sys_mmap(struct lwp *l, const struct compat_43_sys_mmap_args *uap, register_t *retval)
     83 {
     84 	/* {
     85 		syscallarg(void *) addr;
     86 		syscallarg(size_t) len;
     87 		syscallarg(int) prot;
     88 		syscallarg(int) flags;
     89 		syscallarg(int) fd;
     90 		syscallarg(long) pos;
     91 	} */
     92 	struct sys_mmap_args /* {
     93 		syscallarg(void *) addr;
     94 		syscallarg(size_t) len;
     95 		syscallarg(int) prot;
     96 		syscallarg(int) flags;
     97 		syscallarg(int) fd;
     98 		syscallarg(long) pad;
     99 		syscallarg(off_t) pos;
    100 	} */ nargs;
    101 	static const char cvtbsdprot[8] = {
    102 		0,
    103 		PROT_EXEC,
    104 		PROT_WRITE,
    105 		PROT_EXEC|PROT_WRITE,
    106 		PROT_READ,
    107 		PROT_EXEC|PROT_READ,
    108 		PROT_WRITE|PROT_READ,
    109 		PROT_EXEC|PROT_WRITE|PROT_READ,
    110 	};
    111 #define	OMAP_ANON	0x0002
    112 #define	OMAP_COPY	0x0020
    113 #define	OMAP_SHARED	0x0010
    114 #define	OMAP_FIXED	0x0100
    115 #define	OMAP_INHERIT	0x0800
    116 
    117 	SCARG(&nargs, addr) = SCARG(uap, addr);
    118 	SCARG(&nargs, len) = SCARG(uap, len);
    119 	/* Note: index using prot is sign-safe due to mask */
    120 	SCARG(&nargs, prot) = cvtbsdprot[SCARG(uap, prot)&0x7];
    121 	SCARG(&nargs, flags) = 0;
    122 	if (SCARG(uap, flags) & OMAP_ANON)
    123 		SCARG(&nargs, flags) |= MAP_ANON;
    124 	if (SCARG(uap, flags) & OMAP_SHARED)
    125 		SCARG(&nargs, flags) |= MAP_SHARED;
    126 	else
    127 		SCARG(&nargs, flags) |= MAP_PRIVATE;
    128 	if (SCARG(uap, flags) & OMAP_COPY) {
    129 		SCARG(&nargs, flags) |= MAP_PRIVATE;
    130 #if defined(COMPAT_10) && defined(__i386__)
    131 		/*
    132 		 * Ancient kernel on x86 did not obey PROT_EXEC on i386 at least
    133 		 * and ld.so did not turn it on. We take care of this on amd64
    134 		 * in compat32.
    135 		 */
    136 		SCARG(&nargs, prot) |= PROT_EXEC;
    137 #endif
    138 	}
    139 	if (SCARG(uap, flags) & OMAP_FIXED)
    140 		SCARG(&nargs, flags) |= MAP_FIXED;
    141 	if (SCARG(uap, flags) & OMAP_INHERIT)
    142 		SCARG(&nargs, flags) |= MAP_INHERIT;
    143 	SCARG(&nargs, fd) = SCARG(uap, fd);
    144 	SCARG(&nargs, pos) = SCARG(uap, pos);
    145 	return (sys_mmap(l, &nargs, retval));
    146 }
    147 
    148 int
    149 vm_43_init(void)
    150 {
    151 
    152 	return syscall_establish(NULL, vm_43_syscalls);
    153 }
    154 
    155 int
    156 vm_43_fini(void)
    157 {
    158 
    159 	return syscall_disestablish(NULL, vm_43_syscalls);
    160 }
    161