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/arch/um/include/um_uaccess.h

https://bitbucket.org/evzijst/gittest
C Header | 125 lines | 45 code | 15 blank | 65 comment | 0 complexity | 791c2d6cc847601a2ed924af4c273aa8 MD5 | raw file
  1/* 
  2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
  3 * Licensed under the GPL
  4 */
  5
  6#ifndef __ARCH_UM_UACCESS_H
  7#define __ARCH_UM_UACCESS_H
  8
  9#include "linux/config.h"
 10#include "choose-mode.h"
 11
 12#ifdef CONFIG_MODE_TT
 13#include "uaccess-tt.h"
 14#endif
 15
 16#ifdef CONFIG_MODE_SKAS
 17#include "uaccess-skas.h"
 18#endif
 19
 20#define access_ok(type, addr, size) \
 21	CHOOSE_MODE_PROC(access_ok_tt, access_ok_skas, type, addr, size)
 22
 23/* this function will go away soon - use access_ok() instead */
 24static inline int __deprecated verify_area(int type, const void __user *addr, unsigned long size)
 25{
 26	return (CHOOSE_MODE_PROC(verify_area_tt, verify_area_skas, type, addr,
 27				size));
 28}
 29
 30static inline int copy_from_user(void *to, const void __user *from, int n)
 31{
 32	return(CHOOSE_MODE_PROC(copy_from_user_tt, copy_from_user_skas, to,
 33				from, n));
 34}
 35
 36static inline int copy_to_user(void __user *to, const void *from, int n)
 37{
 38	return(CHOOSE_MODE_PROC(copy_to_user_tt, copy_to_user_skas, to, 
 39				from, n));
 40}
 41
 42/*
 43 * strncpy_from_user: - Copy a NUL terminated string from userspace.
 44 * @dst:   Destination address, in kernel space.  This buffer must be at
 45 *         least @count bytes long.
 46 * @src:   Source address, in user space.
 47 * @count: Maximum number of bytes to copy, including the trailing NUL.
 48 *
 49 * Copies a NUL-terminated string from userspace to kernel space.
 50 *
 51 * On success, returns the length of the string (not including the trailing
 52 * NUL).
 53 *
 54 * If access to userspace fails, returns -EFAULT (some data may have been
 55 * copied).
 56 *
 57 * If @count is smaller than the length of the string, copies @count bytes
 58 * and returns @count.
 59 */
 60
 61static inline int strncpy_from_user(char *dst, const char __user *src, int count)
 62{
 63	return(CHOOSE_MODE_PROC(strncpy_from_user_tt, strncpy_from_user_skas,
 64				dst, src, count));
 65}
 66
 67/*
 68 * __clear_user: - Zero a block of memory in user space, with less checking.
 69 * @to:   Destination address, in user space.
 70 * @n:    Number of bytes to zero.
 71 *
 72 * Zero a block of memory in user space.  Caller must check
 73 * the specified block with access_ok() before calling this function.
 74 *
 75 * Returns number of bytes that could not be cleared.
 76 * On success, this will be zero.
 77 */
 78static inline int __clear_user(void *mem, int len)
 79{
 80	return(CHOOSE_MODE_PROC(__clear_user_tt, __clear_user_skas, mem, len));
 81}
 82
 83/*
 84 * clear_user: - Zero a block of memory in user space.
 85 * @to:   Destination address, in user space.
 86 * @n:    Number of bytes to zero.
 87 *
 88 * Zero a block of memory in user space.
 89 *
 90 * Returns number of bytes that could not be cleared.
 91 * On success, this will be zero.
 92 */
 93static inline int clear_user(void __user *mem, int len)
 94{
 95	return(CHOOSE_MODE_PROC(clear_user_tt, clear_user_skas, mem, len));
 96}
 97
 98/*
 99 * strlen_user: - Get the size of a string in user space.
100 * @str: The string to measure.
101 * @n:   The maximum valid length
102 *
103 * Get the size of a NUL-terminated string in user space.
104 *
105 * Returns the size of the string INCLUDING the terminating NUL.
106 * On exception, returns 0.
107 * If the string is too long, returns a value greater than @n.
108 */
109static inline int strnlen_user(const void __user *str, long len)
110{
111	return(CHOOSE_MODE_PROC(strnlen_user_tt, strnlen_user_skas, str, len));
112}
113
114#endif
115
116/*
117 * Overrides for Emacs so that we follow Linus's tabbing style.
118 * Emacs will notice this stuff at the end of the file and automatically
119 * adjust the settings for this buffer only.  This must remain at the end
120 * of the file.
121 * ---------------------------------------------------------------------------
122 * Local variables:
123 * c-file-style: "linux"
124 * End:
125 */