1 #ifndef _ASM_X86_UACCESS_64_H
2 #define _ASM_X86_UACCESS_64_H
5 * User space memory access functions
7 #include <linux/compiler.h>
8 #include <linux/errno.h>
9 #include <linux/prefetch.h>
10 #include <linux/lockdep.h>
14 * Copy To/From Userspace
17 /* Handles exceptions in both to and from, but doesn't do access_ok */
18 __must_check unsigned long
19 copy_user_generic(void *to, const void *from, unsigned len);
21 __must_check unsigned long
22 _copy_to_user(void __user *to, const void *from, unsigned len);
23 __must_check unsigned long
24 _copy_from_user(void *to, const void __user *from, unsigned len);
25 __must_check unsigned long
26 copy_in_user(void __user *to, const void __user *from, unsigned len);
28 static inline unsigned long __must_check copy_from_user(void *to,
29 const void __user *from,
32 int sz = __compiletime_object_size(to);
35 if (likely(sz == -1 || sz >= n))
36 n = _copy_from_user(to, from, n);
37 #ifdef CONFIG_DEBUG_VM
39 WARN(1, "Buffer overflow detected!\n");
44 static __always_inline __must_check
45 int copy_to_user(void __user *dst, const void *src, unsigned size)
49 return _copy_to_user(dst, src, size);
52 static __always_inline __must_check
53 int __copy_from_user(void *dst, const void __user *src, unsigned size)
58 if (!__builtin_constant_p(size))
59 return copy_user_generic(dst, (__force void *)src, size);
61 case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
62 ret, "b", "b", "=q", 1);
64 case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
65 ret, "w", "w", "=r", 2);
67 case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
68 ret, "l", "k", "=r", 4);
70 case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
71 ret, "q", "", "=r", 8);
74 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
75 ret, "q", "", "=r", 10);
78 __get_user_asm(*(u16 *)(8 + (char *)dst),
79 (u16 __user *)(8 + (char __user *)src),
80 ret, "w", "w", "=r", 2);
83 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
84 ret, "q", "", "=r", 16);
87 __get_user_asm(*(u64 *)(8 + (char *)dst),
88 (u64 __user *)(8 + (char __user *)src),
89 ret, "q", "", "=r", 8);
92 return copy_user_generic(dst, (__force void *)src, size);
96 static __always_inline __must_check
97 int __copy_to_user(void __user *dst, const void *src, unsigned size)
102 if (!__builtin_constant_p(size))
103 return copy_user_generic((__force void *)dst, src, size);
105 case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
106 ret, "b", "b", "iq", 1);
108 case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
109 ret, "w", "w", "ir", 2);
111 case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
112 ret, "l", "k", "ir", 4);
114 case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
115 ret, "q", "", "er", 8);
118 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
119 ret, "q", "", "er", 10);
123 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
124 ret, "w", "w", "ir", 2);
127 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
128 ret, "q", "", "er", 16);
132 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
133 ret, "q", "", "er", 8);
136 return copy_user_generic((__force void *)dst, src, size);
140 static __always_inline __must_check
141 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
146 if (!__builtin_constant_p(size))
147 return copy_user_generic((__force void *)dst,
148 (__force void *)src, size);
152 __get_user_asm(tmp, (u8 __user *)src,
153 ret, "b", "b", "=q", 1);
155 __put_user_asm(tmp, (u8 __user *)dst,
156 ret, "b", "b", "iq", 1);
161 __get_user_asm(tmp, (u16 __user *)src,
162 ret, "w", "w", "=r", 2);
164 __put_user_asm(tmp, (u16 __user *)dst,
165 ret, "w", "w", "ir", 2);
171 __get_user_asm(tmp, (u32 __user *)src,
172 ret, "l", "k", "=r", 4);
174 __put_user_asm(tmp, (u32 __user *)dst,
175 ret, "l", "k", "ir", 4);
180 __get_user_asm(tmp, (u64 __user *)src,
181 ret, "q", "", "=r", 8);
183 __put_user_asm(tmp, (u64 __user *)dst,
184 ret, "q", "", "er", 8);
188 return copy_user_generic((__force void *)dst,
189 (__force void *)src, size);
194 strncpy_from_user(char *dst, const char __user *src, long count);
196 __strncpy_from_user(char *dst, const char __user *src, long count);
197 __must_check long strnlen_user(const char __user *str, long n);
198 __must_check long __strnlen_user(const char __user *str, long n);
199 __must_check long strlen_user(const char __user *str);
200 __must_check unsigned long clear_user(void __user *mem, unsigned long len);
201 __must_check unsigned long __clear_user(void __user *mem, unsigned long len);
203 static __must_check __always_inline int
204 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
206 return copy_user_generic(dst, (__force const void *)src, size);
209 static __must_check __always_inline int
210 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
212 return copy_user_generic((__force void *)dst, src, size);
215 extern long __copy_user_nocache(void *dst, const void __user *src,
216 unsigned size, int zerorest);
219 __copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
222 return __copy_user_nocache(dst, src, size, 1);
226 __copy_from_user_inatomic_nocache(void *dst, const void __user *src,
229 return __copy_user_nocache(dst, src, size, 0);
233 copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest);
235 #endif /* _ASM_X86_UACCESS_64_H */