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);
36 if (likely(sz == -1 || sz >= n))
37 ret = _copy_from_user(to, from, n);
38 #ifdef CONFIG_DEBUG_VM
40 WARN(1, "Buffer overflow detected!\n");
45 static __always_inline __must_check
46 int copy_to_user(void __user *dst, const void *src, unsigned size)
50 return _copy_to_user(dst, src, size);
53 static __always_inline __must_check
54 int __copy_from_user(void *dst, const void __user *src, unsigned size)
59 if (!__builtin_constant_p(size))
60 return copy_user_generic(dst, (__force void *)src, size);
62 case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
63 ret, "b", "b", "=q", 1);
65 case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
66 ret, "w", "w", "=r", 2);
68 case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
69 ret, "l", "k", "=r", 4);
71 case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
72 ret, "q", "", "=r", 8);
75 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
76 ret, "q", "", "=r", 10);
79 __get_user_asm(*(u16 *)(8 + (char *)dst),
80 (u16 __user *)(8 + (char __user *)src),
81 ret, "w", "w", "=r", 2);
84 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
85 ret, "q", "", "=r", 16);
88 __get_user_asm(*(u64 *)(8 + (char *)dst),
89 (u64 __user *)(8 + (char __user *)src),
90 ret, "q", "", "=r", 8);
93 return copy_user_generic(dst, (__force void *)src, size);
97 static __always_inline __must_check
98 int __copy_to_user(void __user *dst, const void *src, unsigned size)
103 if (!__builtin_constant_p(size))
104 return copy_user_generic((__force void *)dst, src, size);
106 case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
107 ret, "b", "b", "iq", 1);
109 case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
110 ret, "w", "w", "ir", 2);
112 case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
113 ret, "l", "k", "ir", 4);
115 case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
116 ret, "q", "", "er", 8);
119 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
120 ret, "q", "", "er", 10);
124 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
125 ret, "w", "w", "ir", 2);
128 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
129 ret, "q", "", "er", 16);
133 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
134 ret, "q", "", "er", 8);
137 return copy_user_generic((__force void *)dst, src, size);
141 static __always_inline __must_check
142 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
147 if (!__builtin_constant_p(size))
148 return copy_user_generic((__force void *)dst,
149 (__force void *)src, size);
153 __get_user_asm(tmp, (u8 __user *)src,
154 ret, "b", "b", "=q", 1);
156 __put_user_asm(tmp, (u8 __user *)dst,
157 ret, "b", "b", "iq", 1);
162 __get_user_asm(tmp, (u16 __user *)src,
163 ret, "w", "w", "=r", 2);
165 __put_user_asm(tmp, (u16 __user *)dst,
166 ret, "w", "w", "ir", 2);
172 __get_user_asm(tmp, (u32 __user *)src,
173 ret, "l", "k", "=r", 4);
175 __put_user_asm(tmp, (u32 __user *)dst,
176 ret, "l", "k", "ir", 4);
181 __get_user_asm(tmp, (u64 __user *)src,
182 ret, "q", "", "=r", 8);
184 __put_user_asm(tmp, (u64 __user *)dst,
185 ret, "q", "", "er", 8);
189 return copy_user_generic((__force void *)dst,
190 (__force void *)src, size);
195 strncpy_from_user(char *dst, const char __user *src, long count);
197 __strncpy_from_user(char *dst, const char __user *src, long count);
198 __must_check long strnlen_user(const char __user *str, long n);
199 __must_check long __strnlen_user(const char __user *str, long n);
200 __must_check long strlen_user(const char __user *str);
201 __must_check unsigned long clear_user(void __user *mem, unsigned long len);
202 __must_check unsigned long __clear_user(void __user *mem, unsigned long len);
204 static __must_check __always_inline int
205 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
207 return copy_user_generic(dst, (__force const void *)src, size);
210 static __must_check __always_inline int
211 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
213 return copy_user_generic((__force void *)dst, src, size);
216 extern long __copy_user_nocache(void *dst, const void __user *src,
217 unsigned size, int zerorest);
220 __copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
223 return __copy_user_nocache(dst, src, size, 1);
227 __copy_from_user_inatomic_nocache(void *dst, const void __user *src,
230 return __copy_user_nocache(dst, src, size, 0);
234 copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest);
236 #endif /* _ASM_X86_UACCESS_64_H */