1 /* $NetBSD: uaccess.h,v 1.2 2014/03/18 18:20:42 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _ASM_UACCESS_H_ 33 #define _ASM_UACCESS_H_ 34 35 #include <sys/types.h> 36 #include <sys/systm.h> 37 38 /* XXX This is a cop-out. */ 39 #define VERIFY_READ 0 40 #define VERIFY_WRITE 1 41 static inline bool 42 access_ok(int verify_op __unused, const void *uaddr __unused, 43 size_t nbytes __unused) 44 { 45 return true; 46 } 47 48 #define __copy_from_user copy_from_user 49 #define __copy_to_user copy_to_user 50 51 static inline int 52 copy_from_user(void *kernel_addr, const void *user_addr, size_t len) 53 { 54 /* XXX errno NetBSD->Linux */ 55 return -copyin(user_addr, kernel_addr, len); 56 } 57 58 static inline int 59 copy_to_user(void *user_addr, const void *kernel_addr, size_t len) 60 { 61 /* XXX errno NetBSD->Linux */ 62 return -copyout(kernel_addr, user_addr, len); 63 } 64 65 #define get_user(KERNEL_LOC, USER_ADDR) \ 66 copy_from_user(&(KERNEL_LOC), (USER_ADDR), sizeof(KERNEL_LOC)) 67 68 #define put_user(KERNEL_LOC, USER_ADDR) \ 69 copy_to_user((USER_ADDR), &(KERNEL_LOC), sizeof(KERNEL_LOC)) 70 71 #if 0 72 /* 73 * XXX These `inatomic' versions are a cop out, but they should do for 74 * now -- they are used only in fast paths which can't fault but which 75 * can fall back to slower paths that arrange things so faulting is OK. 76 */ 77 78 static inline int 79 __copy_from_user_inatomic(void *kernel_addr __unused, 80 const void *user_addr __unused, size_t len __unused) 81 { 82 return -EFAULT; 83 } 84 85 static inline int 86 __copy_to_user_inatomic(void *user_addr __unused, 87 const void *kernel_addr __unused, size_t len __unused) 88 { 89 return -EFAULT; 90 } 91 #endif /* 0 */ 92 93 static inline int 94 __copy_from_user_inatomic_nocache(void *kernel_addr __unused, 95 const void *user_addr __unused, size_t len __unused) 96 { 97 return -EFAULT; 98 } 99 100 #endif /* _ASM_UACCESS_H_ */ 101