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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef UACCESS_H |
| 3 | #define UACCESS_H |
| 4 | |
| 5 | #include <linux/compiler.h> |
| 6 | |
| 7 | extern void *__user_addr_min, *__user_addr_max; |
| 8 | |
| 9 | #define put_user(x, ptr) \ |
| 10 | ({ \ |
| 11 | typeof(ptr) __pu_ptr = (ptr); \ |
| 12 | __chk_user_ptr(__pu_ptr); \ |
| 13 | WRITE_ONCE(*(__pu_ptr), x); \ |
| 14 | 0; \ |
| 15 | }) |
| 16 | |
| 17 | #define get_user(x, ptr) \ |
| 18 | ({ \ |
| 19 | typeof(ptr) __pu_ptr = (ptr); \ |
| 20 | __chk_user_ptr(__pu_ptr); \ |
| 21 | x = READ_ONCE(*(__pu_ptr)); \ |
| 22 | 0; \ |
| 23 | }) |
| 24 | |
| 25 | static void volatile_memcpy(volatile char *to, const volatile char *from, |
| 26 | unsigned long n) |
| 27 | { |
| 28 | while (n--) |
| 29 | *(to++) = *(from++); |
| 30 | } |
| 31 | |
| 32 | static inline int copy_from_user(void *to, const void __user volatile *from, |
| 33 | unsigned long n) |
| 34 | { |
| 35 | volatile_memcpy(to, from, n); |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | static inline int copy_to_user(void __user volatile *to, const void *from, |
| 40 | unsigned long n) |
| 41 | { |
| 42 | volatile_memcpy(to, from, n); |
| 43 | return 0; |
| 44 | } |
| 45 | #endif /* UACCESS_H */ |
| 46 |
Warning: This file is not a C or C++ file. It does not have highlighting.