tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
23static inline int copy_from_user(void *to, const void __user *from, int n)
24{
25 return(CHOOSE_MODE_PROC(copy_from_user_tt, copy_from_user_skas, to,
26 from, n));
27}
28
29static inline int copy_to_user(void __user *to, const void *from, int n)
30{
31 return(CHOOSE_MODE_PROC(copy_to_user_tt, copy_to_user_skas, to,
32 from, n));
33}
34
35/*
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.
41 *
42 * Copies a NUL-terminated string from userspace to kernel space.
43 *
44 * On success, returns the length of the string (not including the trailing
45 * NUL).
46 *
47 * If access to userspace fails, returns -EFAULT (some data may have been
48 * copied).
49 *
50 * If @count is smaller than the length of the string, copies @count bytes
51 * and returns @count.
52 */
53
54static inline int strncpy_from_user(char *dst, const char __user *src, int count)
55{
56 return(CHOOSE_MODE_PROC(strncpy_from_user_tt, strncpy_from_user_skas,
57 dst, src, count));
58}
59
60/*
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.
64 *
65 * Zero a block of memory in user space. Caller must check
66 * the specified block with access_ok() before calling this function.
67 *
68 * Returns number of bytes that could not be cleared.
69 * On success, this will be zero.
70 */
71static inline int __clear_user(void *mem, int len)
72{
73 return(CHOOSE_MODE_PROC(__clear_user_tt, __clear_user_skas, mem, len));
74}
75
76/*
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.
80 *
81 * Zero a block of memory in user space.
82 *
83 * Returns number of bytes that could not be cleared.
84 * On success, this will be zero.
85 */
86static inline int clear_user(void __user *mem, int len)
87{
88 return(CHOOSE_MODE_PROC(clear_user_tt, clear_user_skas, mem, len));
89}
90
91/*
92 * strlen_user: - Get the size of a string in user space.
93 * @str: The string to measure.
94 * @n: The maximum valid length
95 *
96 * Get the size of a NUL-terminated string in user space.
97 *
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.
101 */
102static inline int strnlen_user(const void __user *str, long len)
103{
104 return(CHOOSE_MODE_PROC(strnlen_user_tt, strnlen_user_skas, str, len));
105}
106
107#endif
108
109/*
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
113 * of the file.
114 * ---------------------------------------------------------------------------
115 * Local variables:
116 * c-file-style: "linux"
117 * End:
118 */