1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/compiler.h>
7 extern void *__user_addr_min, *__user_addr_max;
9 static inline void __chk_user_ptr(const volatile void *p, size_t size)
11 assert(p >= __user_addr_min && p + size <= __user_addr_max);
14 #define put_user(x, ptr) \
16 typeof(ptr) __pu_ptr = (ptr); \
17 __chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \
18 WRITE_ONCE(*(__pu_ptr), x); \
22 #define get_user(x, ptr) \
24 typeof(ptr) __pu_ptr = (ptr); \
25 __chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \
26 x = READ_ONCE(*(__pu_ptr)); \
30 static void volatile_memcpy(volatile char *to, const volatile char *from,
37 static inline int copy_from_user(void *to, const void __user volatile *from,
40 __chk_user_ptr(from, n);
41 volatile_memcpy(to, from, n);
45 static inline int copy_to_user(void __user volatile *to, const void *from,
48 __chk_user_ptr(to, n);
49 volatile_memcpy(to, from, n);
52 #endif /* UACCESS_H */