blob: 5eea6f3c1e03be13c06fb25ea04f64e45ece5954 [file] [log] [blame]
Paul Mackerras14cf11a2005-09-26 16:04:21 +10001/*
2 * Functions which are too large to be inlined.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9#include <linux/module.h>
10#include <asm/uaccess.h>
11
12unsigned long copy_from_user(void *to, const void __user *from, unsigned long n)
13{
14 if (likely(access_ok(VERIFY_READ, from, n)))
15 n = __copy_from_user(to, from, n);
16 else
17 memset(to, 0, n);
18 return n;
19}
20
21unsigned long copy_to_user(void __user *to, const void *from, unsigned long n)
22{
23 if (likely(access_ok(VERIFY_WRITE, to, n)))
24 n = __copy_to_user(to, from, n);
25 return n;
26}
27
28unsigned long copy_in_user(void __user *to, const void __user *from,
29 unsigned long n)
30{
31 might_sleep();
32 if (likely(access_ok(VERIFY_READ, from, n) &&
33 access_ok(VERIFY_WRITE, to, n)))
34 n =__copy_tofrom_user(to, from, n);
35 return n;
36}
37
38EXPORT_SYMBOL(copy_from_user);
39EXPORT_SYMBOL(copy_to_user);
40EXPORT_SYMBOL(copy_in_user);
41