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>
11 #include <asm/alternative.h>
12 #include <asm/cpufeature.h>
16 * Copy To/From Userspace
19 /* Handles exceptions in both to and from, but doesn't do access_ok */
20 __must_check unsigned long
21 copy_user_generic_string(void *to, const void *from, unsigned len);
22 __must_check unsigned long
23 copy_user_generic_unrolled(void *to, const void *from, unsigned len);
25 static __always_inline __must_check unsigned long
26 copy_user_generic(void *to, const void *from, unsigned len)
30 alternative_call(copy_user_generic_unrolled,
31 copy_user_generic_string,
33 ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
35 "1" (to), "2" (from), "3" (len)
36 : "memory", "rcx", "r8", "r9", "r10", "r11");
40 __must_check unsigned long
41 _copy_to_user(void __user *to, const void *from, unsigned len);
42 __must_check unsigned long
43 _copy_from_user(void *to, const void __user *from, unsigned len);
44 __must_check unsigned long
45 copy_in_user(void __user *to, const void __user *from, unsigned len);
47 static inline unsigned long __must_check copy_from_user(void *to,
48 const void __user *from,
51 int sz = __compiletime_object_size(to);
54 if (likely(sz == -1 || sz >= n))
55 n = _copy_from_user(to, from, n);
56 #ifdef CONFIG_DEBUG_VM
58 WARN(1, "Buffer overflow detected!\n");
63 static __always_inline __must_check
64 int copy_to_user(void __user *dst, const void *src, unsigned size)
68 return _copy_to_user(dst, src, size);
71 static __always_inline __must_check
72 int __copy_from_user(void *dst, const void __user *src, unsigned size)
77 if (!__builtin_constant_p(size))
78 return copy_user_generic(dst, (__force void *)src, size);
80 case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
81 ret, "b", "b", "=q", 1);
83 case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
84 ret, "w", "w", "=r", 2);
86 case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
87 ret, "l", "k", "=r", 4);
89 case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
90 ret, "q", "", "=r", 8);
93 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
94 ret, "q", "", "=r", 10);
97 __get_user_asm(*(u16 *)(8 + (char *)dst),
98 (u16 __user *)(8 + (char __user *)src),
99 ret, "w", "w", "=r", 2);
102 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
103 ret, "q", "", "=r", 16);
106 __get_user_asm(*(u64 *)(8 + (char *)dst),
107 (u64 __user *)(8 + (char __user *)src),
108 ret, "q", "", "=r", 8);
111 return copy_user_generic(dst, (__force void *)src, size);
115 static __always_inline __must_check
116 int __copy_to_user(void __user *dst, const void *src, unsigned size)
121 if (!__builtin_constant_p(size))
122 return copy_user_generic((__force void *)dst, src, size);
124 case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
125 ret, "b", "b", "iq", 1);
127 case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
128 ret, "w", "w", "ir", 2);
130 case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
131 ret, "l", "k", "ir", 4);
133 case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
134 ret, "q", "", "er", 8);
137 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
138 ret, "q", "", "er", 10);
142 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
143 ret, "w", "w", "ir", 2);
146 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
147 ret, "q", "", "er", 16);
151 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
152 ret, "q", "", "er", 8);
155 return copy_user_generic((__force void *)dst, src, size);
159 static __always_inline __must_check
160 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
165 if (!__builtin_constant_p(size))
166 return copy_user_generic((__force void *)dst,
167 (__force void *)src, size);
171 __get_user_asm(tmp, (u8 __user *)src,
172 ret, "b", "b", "=q", 1);
174 __put_user_asm(tmp, (u8 __user *)dst,
175 ret, "b", "b", "iq", 1);
180 __get_user_asm(tmp, (u16 __user *)src,
181 ret, "w", "w", "=r", 2);
183 __put_user_asm(tmp, (u16 __user *)dst,
184 ret, "w", "w", "ir", 2);
190 __get_user_asm(tmp, (u32 __user *)src,
191 ret, "l", "k", "=r", 4);
193 __put_user_asm(tmp, (u32 __user *)dst,
194 ret, "l", "k", "ir", 4);
199 __get_user_asm(tmp, (u64 __user *)src,
200 ret, "q", "", "=r", 8);
202 __put_user_asm(tmp, (u64 __user *)dst,
203 ret, "q", "", "er", 8);
207 return copy_user_generic((__force void *)dst,
208 (__force void *)src, size);
213 strncpy_from_user(char *dst, const char __user *src, long count);
215 __strncpy_from_user(char *dst, const char __user *src, long count);
216 __must_check long strnlen_user(const char __user *str, long n);
217 __must_check long __strnlen_user(const char __user *str, long n);
218 __must_check long strlen_user(const char __user *str);
219 __must_check unsigned long clear_user(void __user *mem, unsigned long len);
220 __must_check unsigned long __clear_user(void __user *mem, unsigned long len);
222 static __must_check __always_inline int
223 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
225 return copy_user_generic(dst, (__force const void *)src, size);
228 static __must_check __always_inline int
229 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
231 return copy_user_generic((__force void *)dst, src, size);
234 extern long __copy_user_nocache(void *dst, const void __user *src,
235 unsigned size, int zerorest);
238 __copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
241 return __copy_user_nocache(dst, src, size, 1);
245 __copy_from_user_inatomic_nocache(void *dst, const void __user *src,
248 return __copy_user_nocache(dst, src, size, 0);
252 copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest);
254 #endif /* _ASM_X86_UACCESS_64_H */