1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_UACCESS_64_H
3 #define _ASM_X86_UACCESS_64_H
6 * User space memory access functions
8 #include <linux/compiler.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 static __always_inline __must_check
unsigned long
50 raw_copy_from_user(void *dst
, const void __user
*src
, unsigned long size
)
54 if (!__builtin_constant_p(size
))
55 return copy_user_generic(dst
, (__force
void *)src
, size
);
58 __uaccess_begin_nospec();
59 __get_user_asm_nozero(*(u8
*)dst
, (u8 __user
*)src
,
60 ret
, "b", "b", "=q", 1);
64 __uaccess_begin_nospec();
65 __get_user_asm_nozero(*(u16
*)dst
, (u16 __user
*)src
,
66 ret
, "w", "w", "=r", 2);
70 __uaccess_begin_nospec();
71 __get_user_asm_nozero(*(u32
*)dst
, (u32 __user
*)src
,
72 ret
, "l", "k", "=r", 4);
76 __uaccess_begin_nospec();
77 __get_user_asm_nozero(*(u64
*)dst
, (u64 __user
*)src
,
78 ret
, "q", "", "=r", 8);
82 __uaccess_begin_nospec();
83 __get_user_asm_nozero(*(u64
*)dst
, (u64 __user
*)src
,
84 ret
, "q", "", "=r", 10);
86 __get_user_asm_nozero(*(u16
*)(8 + (char *)dst
),
87 (u16 __user
*)(8 + (char __user
*)src
),
88 ret
, "w", "w", "=r", 2);
92 __uaccess_begin_nospec();
93 __get_user_asm_nozero(*(u64
*)dst
, (u64 __user
*)src
,
94 ret
, "q", "", "=r", 16);
96 __get_user_asm_nozero(*(u64
*)(8 + (char *)dst
),
97 (u64 __user
*)(8 + (char __user
*)src
),
98 ret
, "q", "", "=r", 8);
102 return copy_user_generic(dst
, (__force
void *)src
, size
);
106 static __always_inline __must_check
unsigned long
107 raw_copy_to_user(void __user
*dst
, const void *src
, unsigned long size
)
111 if (!__builtin_constant_p(size
))
112 return copy_user_generic((__force
void *)dst
, src
, size
);
116 __put_user_asm(*(u8
*)src
, (u8 __user
*)dst
,
117 ret
, "b", "b", "iq", 1);
122 __put_user_asm(*(u16
*)src
, (u16 __user
*)dst
,
123 ret
, "w", "w", "ir", 2);
128 __put_user_asm(*(u32
*)src
, (u32 __user
*)dst
,
129 ret
, "l", "k", "ir", 4);
134 __put_user_asm(*(u64
*)src
, (u64 __user
*)dst
,
135 ret
, "q", "", "er", 8);
140 __put_user_asm(*(u64
*)src
, (u64 __user
*)dst
,
141 ret
, "q", "", "er", 10);
144 __put_user_asm(4[(u16
*)src
], 4 + (u16 __user
*)dst
,
145 ret
, "w", "w", "ir", 2);
151 __put_user_asm(*(u64
*)src
, (u64 __user
*)dst
,
152 ret
, "q", "", "er", 16);
155 __put_user_asm(1[(u64
*)src
], 1 + (u64 __user
*)dst
,
156 ret
, "q", "", "er", 8);
161 return copy_user_generic((__force
void *)dst
, src
, size
);
165 static __always_inline __must_check
166 unsigned long raw_copy_in_user(void __user
*dst
, const void __user
*src
, unsigned long size
)
168 return copy_user_generic((__force
void *)dst
,
169 (__force
void *)src
, size
);
172 extern long __copy_user_nocache(void *dst
, const void __user
*src
,
173 unsigned size
, int zerorest
);
175 extern long __copy_user_flushcache(void *dst
, const void __user
*src
, unsigned size
);
176 extern void memcpy_page_flushcache(char *to
, struct page
*page
, size_t offset
,
180 __copy_from_user_inatomic_nocache(void *dst
, const void __user
*src
,
183 kasan_check_write(dst
, size
);
184 return __copy_user_nocache(dst
, src
, size
, 0);
188 __copy_from_user_flushcache(void *dst
, const void __user
*src
, unsigned size
)
190 kasan_check_write(dst
, size
);
191 return __copy_user_flushcache(dst
, src
, size
);
195 copy_user_handle_tail(char *to
, char *from
, unsigned len
);
197 #endif /* _ASM_X86_UACCESS_64_H */