Home | History | Annotate | Line # | Download | only in common 
      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