projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 61d0b5a4 RR |
1 | #ifndef UACCESS_H |
| 2 | #define UACCESS_H | |
| 3 | extern void *__user_addr_min, *__user_addr_max; | |
| 4 | ||
| 5 | #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) | |
| 6 | ||
| 7 | static inline void __chk_user_ptr(const volatile void *p, size_t size) | |
| 8 | { | |
| 9 | assert(p >= __user_addr_min && p + size <= __user_addr_max); | |
| 10 | } | |
| 11 | ||
| 12 | #define put_user(x, ptr) \ | |
| 13 | ({ \ | |
| 14 | typeof(ptr) __pu_ptr = (ptr); \ | |
| 15 | __chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \ | |
| 16 | ACCESS_ONCE(*(__pu_ptr)) = x; \ | |
| 17 | 0; \ | |
| 18 | }) | |
| 19 | ||
| 20 | #define get_user(x, ptr) \ | |
| 21 | ({ \ | |
| 22 | typeof(ptr) __pu_ptr = (ptr); \ | |
| 23 | __chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \ | |
| 24 | x = ACCESS_ONCE(*(__pu_ptr)); \ | |
| 25 | 0; \ | |
| 26 | }) | |
| 27 | ||
| 28 | static void volatile_memcpy(volatile char *to, const volatile char *from, | |
| 29 | unsigned long n) | |
| 30 | { | |
| 31 | while (n--) | |
| 32 | *(to++) = *(from++); | |
| 33 | } | |
| 34 | ||
| 35 | static inline int copy_from_user(void *to, const void __user volatile *from, | |
| 36 | unsigned long n) | |
| 37 | { | |
| 38 | __chk_user_ptr(from, n); | |
| 39 | volatile_memcpy(to, from, n); | |
| 40 | return 0; | |
| 41 | } | |
| 42 | ||
| 43 | static inline int copy_to_user(void __user volatile *to, const void *from, | |
| 44 | unsigned long n) | |
| 45 | { | |
| 46 | __chk_user_ptr(to, n); | |
| 47 | volatile_memcpy(to, from, n); | |
| 48 | return 0; | |
| 49 | } | |
| 50 | #endif /* UACCESS_H */ |