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 <asm/alternative.h>
11 #include <asm/cpufeature.h>
15 * Copy To/From Userspace
18 /* Handles exceptions in both to and from, but doesn't do access_ok */
19 __must_check unsigned long
20 copy_user_enhanced_fast_string(void *to, const void *from, unsigned len);
21 __must_check unsigned long
22 copy_user_generic_string(void *to, const void *from, unsigned len);
23 __must_check unsigned long
24 copy_user_generic_unrolled(void *to, const void *from, unsigned len);
26 static __always_inline __must_check unsigned long
27 copy_user_generic(void *to, const void *from, unsigned len)
32 * If CPU has ERMS feature, use copy_user_enhanced_fast_string.
33 * Otherwise, if CPU has rep_good feature, use copy_user_generic_string.
34 * Otherwise, use copy_user_generic_unrolled.
36 alternative_call_2(copy_user_generic_unrolled,
37 copy_user_generic_string,
39 copy_user_enhanced_fast_string,
41 ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
43 "1" (to), "2" (from), "3" (len)
44 : "memory", "rcx", "r8", "r9", "r10", "r11");
48 __must_check unsigned long
49 copy_in_user(void __user *to, const void __user *from, unsigned len);
51 static __always_inline __must_check
52 int __copy_from_user(void *dst, const void __user *src, unsigned size)
57 if (!__builtin_constant_p(size))
58 return copy_user_generic(dst, (__force void *)src, size);
60 case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
61 ret, "b", "b", "=q", 1);
63 case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
64 ret, "w", "w", "=r", 2);
66 case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
67 ret, "l", "k", "=r", 4);
69 case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
70 ret, "q", "", "=r", 8);
73 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
74 ret, "q", "", "=r", 10);
77 __get_user_asm(*(u16 *)(8 + (char *)dst),
78 (u16 __user *)(8 + (char __user *)src),
79 ret, "w", "w", "=r", 2);
82 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
83 ret, "q", "", "=r", 16);
86 __get_user_asm(*(u64 *)(8 + (char *)dst),
87 (u64 __user *)(8 + (char __user *)src),
88 ret, "q", "", "=r", 8);
91 return copy_user_generic(dst, (__force void *)src, size);
95 static __always_inline __must_check
96 int __copy_to_user(void __user *dst, const void *src, unsigned size)
101 if (!__builtin_constant_p(size))
102 return copy_user_generic((__force void *)dst, src, size);
104 case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
105 ret, "b", "b", "iq", 1);
107 case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
108 ret, "w", "w", "ir", 2);
110 case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
111 ret, "l", "k", "ir", 4);
113 case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
114 ret, "q", "", "er", 8);
117 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
118 ret, "q", "", "er", 10);
122 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
123 ret, "w", "w", "ir", 2);
126 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
127 ret, "q", "", "er", 16);
131 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
132 ret, "q", "", "er", 8);
135 return copy_user_generic((__force void *)dst, src, size);
139 static __always_inline __must_check
140 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
145 if (!__builtin_constant_p(size))
146 return copy_user_generic((__force void *)dst,
147 (__force void *)src, size);
151 __get_user_asm(tmp, (u8 __user *)src,
152 ret, "b", "b", "=q", 1);
154 __put_user_asm(tmp, (u8 __user *)dst,
155 ret, "b", "b", "iq", 1);
160 __get_user_asm(tmp, (u16 __user *)src,
161 ret, "w", "w", "=r", 2);
163 __put_user_asm(tmp, (u16 __user *)dst,
164 ret, "w", "w", "ir", 2);
170 __get_user_asm(tmp, (u32 __user *)src,
171 ret, "l", "k", "=r", 4);
173 __put_user_asm(tmp, (u32 __user *)dst,
174 ret, "l", "k", "ir", 4);
179 __get_user_asm(tmp, (u64 __user *)src,
180 ret, "q", "", "=r", 8);
182 __put_user_asm(tmp, (u64 __user *)dst,
183 ret, "q", "", "er", 8);
187 return copy_user_generic((__force void *)dst,
188 (__force void *)src, size);
192 static __must_check __always_inline int
193 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
195 return copy_user_generic(dst, (__force const void *)src, size);
198 static __must_check __always_inline int
199 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
201 return copy_user_generic((__force void *)dst, src, size);
204 extern long __copy_user_nocache(void *dst, const void __user *src,
205 unsigned size, int zerorest);
208 __copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
211 return __copy_user_nocache(dst, src, size, 1);
215 __copy_from_user_inatomic_nocache(void *dst, const void __user *src,
218 return __copy_user_nocache(dst, src, size, 0);
222 copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest);
224 #endif /* _ASM_X86_UACCESS_64_H */