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_nocheck(void *dst, const void __user *src, unsigned size)
56 if (!__builtin_constant_p(size))
57 return copy_user_generic(dst, (__force void *)src, size);
59 case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
60 ret, "b", "b", "=q", 1);
62 case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
63 ret, "w", "w", "=r", 2);
65 case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
66 ret, "l", "k", "=r", 4);
68 case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
69 ret, "q", "", "=r", 8);
72 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
73 ret, "q", "", "=r", 10);
76 __get_user_asm(*(u16 *)(8 + (char *)dst),
77 (u16 __user *)(8 + (char __user *)src),
78 ret, "w", "w", "=r", 2);
81 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
82 ret, "q", "", "=r", 16);
85 __get_user_asm(*(u64 *)(8 + (char *)dst),
86 (u64 __user *)(8 + (char __user *)src),
87 ret, "q", "", "=r", 8);
90 return copy_user_generic(dst, (__force void *)src, size);
94 static __always_inline __must_check
95 int __copy_from_user(void *dst, const void __user *src, unsigned size)
98 return __copy_from_user_nocheck(dst, src, size);
101 static __always_inline __must_check
102 int __copy_to_user_nocheck(void __user *dst, const void *src, unsigned size)
106 if (!__builtin_constant_p(size))
107 return copy_user_generic((__force void *)dst, src, size);
109 case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
110 ret, "b", "b", "iq", 1);
112 case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
113 ret, "w", "w", "ir", 2);
115 case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
116 ret, "l", "k", "ir", 4);
118 case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
119 ret, "q", "", "er", 8);
122 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
123 ret, "q", "", "er", 10);
127 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
128 ret, "w", "w", "ir", 2);
131 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
132 ret, "q", "", "er", 16);
136 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
137 ret, "q", "", "er", 8);
140 return copy_user_generic((__force void *)dst, src, size);
144 static __always_inline __must_check
145 int __copy_to_user(void __user *dst, const void *src, unsigned size)
148 return __copy_to_user_nocheck(dst, src, size);
151 static __always_inline __must_check
152 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
157 if (!__builtin_constant_p(size))
158 return copy_user_generic((__force void *)dst,
159 (__force void *)src, size);
163 __get_user_asm(tmp, (u8 __user *)src,
164 ret, "b", "b", "=q", 1);
166 __put_user_asm(tmp, (u8 __user *)dst,
167 ret, "b", "b", "iq", 1);
172 __get_user_asm(tmp, (u16 __user *)src,
173 ret, "w", "w", "=r", 2);
175 __put_user_asm(tmp, (u16 __user *)dst,
176 ret, "w", "w", "ir", 2);
182 __get_user_asm(tmp, (u32 __user *)src,
183 ret, "l", "k", "=r", 4);
185 __put_user_asm(tmp, (u32 __user *)dst,
186 ret, "l", "k", "ir", 4);
191 __get_user_asm(tmp, (u64 __user *)src,
192 ret, "q", "", "=r", 8);
194 __put_user_asm(tmp, (u64 __user *)dst,
195 ret, "q", "", "er", 8);
199 return copy_user_generic((__force void *)dst,
200 (__force void *)src, size);
204 static __must_check __always_inline int
205 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
207 return __copy_from_user_nocheck(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_to_user_nocheck((__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 */