2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #ifndef __ARCH_UM_UACCESS_H
7 #define __ARCH_UM_UACCESS_H
9 #include "linux/config.h"
10 #include "choose-mode.h"
13 #include "uaccess-tt.h"
16 #ifdef CONFIG_MODE_SKAS
17 #include "uaccess-skas.h"
20 #define access_ok(type, addr, size) \
21 CHOOSE_MODE_PROC(access_ok_tt, access_ok_skas, type, addr, size)
23 static inline int copy_from_user(void *to, const void __user *from, int n)
25 return(CHOOSE_MODE_PROC(copy_from_user_tt, copy_from_user_skas, to,
29 static inline int copy_to_user(void __user *to, const void *from, int n)
31 return(CHOOSE_MODE_PROC(copy_to_user_tt, copy_to_user_skas, to,
36 * strncpy_from_user: - Copy a NUL terminated string from userspace.
37 * @dst: Destination address, in kernel space. This buffer must be at
38 * least @count bytes long.
39 * @src: Source address, in user space.
40 * @count: Maximum number of bytes to copy, including the trailing NUL.
42 * Copies a NUL-terminated string from userspace to kernel space.
44 * On success, returns the length of the string (not including the trailing
47 * If access to userspace fails, returns -EFAULT (some data may have been
50 * If @count is smaller than the length of the string, copies @count bytes
54 static inline int strncpy_from_user(char *dst, const char __user *src, int count)
56 return(CHOOSE_MODE_PROC(strncpy_from_user_tt, strncpy_from_user_skas,
61 * __clear_user: - Zero a block of memory in user space, with less checking.
62 * @to: Destination address, in user space.
63 * @n: Number of bytes to zero.
65 * Zero a block of memory in user space. Caller must check
66 * the specified block with access_ok() before calling this function.
68 * Returns number of bytes that could not be cleared.
69 * On success, this will be zero.
71 static inline int __clear_user(void *mem, int len)
73 return(CHOOSE_MODE_PROC(__clear_user_tt, __clear_user_skas, mem, len));
77 * clear_user: - Zero a block of memory in user space.
78 * @to: Destination address, in user space.
79 * @n: Number of bytes to zero.
81 * Zero a block of memory in user space.
83 * Returns number of bytes that could not be cleared.
84 * On success, this will be zero.
86 static inline int clear_user(void __user *mem, int len)
88 return(CHOOSE_MODE_PROC(clear_user_tt, clear_user_skas, mem, len));
92 * strlen_user: - Get the size of a string in user space.
93 * @str: The string to measure.
94 * @n: The maximum valid length
96 * Get the size of a NUL-terminated string in user space.
98 * Returns the size of the string INCLUDING the terminating NUL.
99 * On exception, returns 0.
100 * If the string is too long, returns a value greater than @n.
102 static inline int strnlen_user(const void __user *str, long len)
104 return(CHOOSE_MODE_PROC(strnlen_user_tt, strnlen_user_skas, str, len));
110 * Overrides for Emacs so that we follow Linus's tabbing style.
111 * Emacs will notice this stuff at the end of the file and automatically
112 * adjust the settings for this buffer only. This must remain at the end
114 * ---------------------------------------------------------------------------
116 * c-file-style: "linux"