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/lockdep.h>
10 #include <linux/kasan-checks.h>
11 #include <asm/alternative.h>
12 #include <asm/cpufeatures.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_enhanced_fast_string(void *to
, const void *from
, unsigned len
);
22 __must_check
unsigned long
23 copy_user_generic_string(void *to
, const void *from
, unsigned len
);
24 __must_check
unsigned long
25 copy_user_generic_unrolled(void *to
, const void *from
, unsigned len
);
27 static __always_inline __must_check
unsigned long
28 copy_user_generic(void *to
, const void *from
, unsigned len
)
33 * If CPU has ERMS feature, use copy_user_enhanced_fast_string.
34 * Otherwise, if CPU has rep_good feature, use copy_user_generic_string.
35 * Otherwise, use copy_user_generic_unrolled.
37 alternative_call_2(copy_user_generic_unrolled
,
38 copy_user_generic_string
,
40 copy_user_enhanced_fast_string
,
42 ASM_OUTPUT2("=a" (ret
), "=D" (to
), "=S" (from
),
44 "1" (to
), "2" (from
), "3" (len
)
45 : "memory", "rcx", "r8", "r9", "r10", "r11");
49 __must_check
unsigned long
50 copy_in_user(void __user
*to
, const void __user
*from
, unsigned len
);
52 static __always_inline __must_check
53 int __copy_from_user_nocheck(void *dst
, const void __user
*src
, unsigned size
)
57 if (!__builtin_constant_p(size
))
58 return copy_user_generic(dst
, (__force
void *)src
, size
);
62 __get_user_asm(*(u8
*)dst
, (u8 __user
*)src
,
63 ret
, "b", "b", "=q", 1);
68 __get_user_asm(*(u16
*)dst
, (u16 __user
*)src
,
69 ret
, "w", "w", "=r", 2);
74 __get_user_asm(*(u32
*)dst
, (u32 __user
*)src
,
75 ret
, "l", "k", "=r", 4);
80 __get_user_asm(*(u64
*)dst
, (u64 __user
*)src
,
81 ret
, "q", "", "=r", 8);
86 __get_user_asm(*(u64
*)dst
, (u64 __user
*)src
,
87 ret
, "q", "", "=r", 10);
89 __get_user_asm(*(u16
*)(8 + (char *)dst
),
90 (u16 __user
*)(8 + (char __user
*)src
),
91 ret
, "w", "w", "=r", 2);
96 __get_user_asm(*(u64
*)dst
, (u64 __user
*)src
,
97 ret
, "q", "", "=r", 16);
99 __get_user_asm(*(u64
*)(8 + (char *)dst
),
100 (u64 __user
*)(8 + (char __user
*)src
),
101 ret
, "q", "", "=r", 8);
105 return copy_user_generic(dst
, (__force
void *)src
, size
);
109 static __always_inline __must_check
110 int __copy_from_user(void *dst
, const void __user
*src
, unsigned size
)
113 kasan_check_write(dst
, size
);
114 return __copy_from_user_nocheck(dst
, src
, size
);
117 static __always_inline __must_check
118 int __copy_to_user_nocheck(void __user
*dst
, const void *src
, unsigned size
)
122 if (!__builtin_constant_p(size
))
123 return copy_user_generic((__force
void *)dst
, src
, size
);
127 __put_user_asm(*(u8
*)src
, (u8 __user
*)dst
,
128 ret
, "b", "b", "iq", 1);
133 __put_user_asm(*(u16
*)src
, (u16 __user
*)dst
,
134 ret
, "w", "w", "ir", 2);
139 __put_user_asm(*(u32
*)src
, (u32 __user
*)dst
,
140 ret
, "l", "k", "ir", 4);
145 __put_user_asm(*(u64
*)src
, (u64 __user
*)dst
,
146 ret
, "q", "", "er", 8);
151 __put_user_asm(*(u64
*)src
, (u64 __user
*)dst
,
152 ret
, "q", "", "er", 10);
155 __put_user_asm(4[(u16
*)src
], 4 + (u16 __user
*)dst
,
156 ret
, "w", "w", "ir", 2);
162 __put_user_asm(*(u64
*)src
, (u64 __user
*)dst
,
163 ret
, "q", "", "er", 16);
166 __put_user_asm(1[(u64
*)src
], 1 + (u64 __user
*)dst
,
167 ret
, "q", "", "er", 8);
172 return copy_user_generic((__force
void *)dst
, src
, size
);
176 static __always_inline __must_check
177 int __copy_to_user(void __user
*dst
, const void *src
, unsigned size
)
180 kasan_check_read(src
, size
);
181 return __copy_to_user_nocheck(dst
, src
, size
);
184 static __always_inline __must_check
185 int __copy_in_user(void __user
*dst
, const void __user
*src
, unsigned size
)
190 if (!__builtin_constant_p(size
))
191 return copy_user_generic((__force
void *)dst
,
192 (__force
void *)src
, size
);
197 __get_user_asm(tmp
, (u8 __user
*)src
,
198 ret
, "b", "b", "=q", 1);
200 __put_user_asm(tmp
, (u8 __user
*)dst
,
201 ret
, "b", "b", "iq", 1);
208 __get_user_asm(tmp
, (u16 __user
*)src
,
209 ret
, "w", "w", "=r", 2);
211 __put_user_asm(tmp
, (u16 __user
*)dst
,
212 ret
, "w", "w", "ir", 2);
220 __get_user_asm(tmp
, (u32 __user
*)src
,
221 ret
, "l", "k", "=r", 4);
223 __put_user_asm(tmp
, (u32 __user
*)dst
,
224 ret
, "l", "k", "ir", 4);
231 __get_user_asm(tmp
, (u64 __user
*)src
,
232 ret
, "q", "", "=r", 8);
234 __put_user_asm(tmp
, (u64 __user
*)dst
,
235 ret
, "q", "", "er", 8);
240 return copy_user_generic((__force
void *)dst
,
241 (__force
void *)src
, size
);
245 static __must_check __always_inline
int
246 __copy_from_user_inatomic(void *dst
, const void __user
*src
, unsigned size
)
248 kasan_check_write(dst
, size
);
249 return __copy_from_user_nocheck(dst
, src
, size
);
252 static __must_check __always_inline
int
253 __copy_to_user_inatomic(void __user
*dst
, const void *src
, unsigned size
)
255 kasan_check_read(src
, size
);
256 return __copy_to_user_nocheck(dst
, src
, size
);
259 extern long __copy_user_nocache(void *dst
, const void __user
*src
,
260 unsigned size
, int zerorest
);
263 __copy_from_user_nocache(void *dst
, const void __user
*src
, unsigned size
)
266 kasan_check_write(dst
, size
);
267 return __copy_user_nocache(dst
, src
, size
, 1);
271 __copy_from_user_inatomic_nocache(void *dst
, const void __user
*src
,
274 kasan_check_write(dst
, size
);
275 return __copy_user_nocache(dst
, src
, size
, 0);
279 copy_user_handle_tail(char *to
, char *from
, unsigned len
);
281 #endif /* _ASM_X86_UACCESS_64_H */