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1965aae3 PA |
1 | #ifndef _ASM_X86_UACCESS_64_H |
2 | #define _ASM_X86_UACCESS_64_H | |
1da177e4 LT |
3 | |
4 | /* | |
5 | * User space memory access functions | |
6 | */ | |
1da177e4 LT |
7 | #include <linux/compiler.h> |
8 | #include <linux/errno.h> | |
16dbc6c9 | 9 | #include <linux/lockdep.h> |
1b1d9258 JB |
10 | #include <asm/alternative.h> |
11 | #include <asm/cpufeature.h> | |
1da177e4 LT |
12 | #include <asm/page.h> |
13 | ||
1da177e4 LT |
14 | /* |
15 | * Copy To/From Userspace | |
16 | */ | |
17 | ||
18 | /* Handles exceptions in both to and from, but doesn't do access_ok */ | |
95912008 | 19 | __must_check unsigned long |
954e482b FY |
20 | copy_user_enhanced_fast_string(void *to, const void *from, unsigned len); |
21 | __must_check unsigned long | |
1b1d9258 JB |
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); | |
25 | ||
26 | static __always_inline __must_check unsigned long | |
27 | copy_user_generic(void *to, const void *from, unsigned len) | |
28 | { | |
29 | unsigned ret; | |
30 | ||
954e482b FY |
31 | /* |
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. | |
35 | */ | |
36 | alternative_call_2(copy_user_generic_unrolled, | |
1b1d9258 JB |
37 | copy_user_generic_string, |
38 | X86_FEATURE_REP_GOOD, | |
954e482b FY |
39 | copy_user_enhanced_fast_string, |
40 | X86_FEATURE_ERMS, | |
1b1d9258 JB |
41 | ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from), |
42 | "=d" (len)), | |
43 | "1" (to), "2" (from), "3" (len) | |
44 | : "memory", "rcx", "r8", "r9", "r10", "r11"); | |
45 | return ret; | |
46 | } | |
95912008 | 47 | |
95912008 | 48 | __must_check unsigned long |
95912008 AK |
49 | copy_in_user(void __user *to, const void __user *from, unsigned len); |
50 | ||
51 | static __always_inline __must_check | |
ff47ab4f | 52 | int __copy_from_user_nocheck(void *dst, const void __user *src, unsigned size) |
b896313e | 53 | { |
383d079b | 54 | int ret = 0; |
c10d38dd | 55 | |
1da177e4 | 56 | if (!__builtin_constant_p(size)) |
b896313e JP |
57 | return copy_user_generic(dst, (__force void *)src, size); |
58 | switch (size) { | |
59 | case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src, | |
60 | ret, "b", "b", "=q", 1); | |
1da177e4 | 61 | return ret; |
b896313e JP |
62 | case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src, |
63 | ret, "w", "w", "=r", 2); | |
1da177e4 | 64 | return ret; |
b896313e JP |
65 | case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src, |
66 | ret, "l", "k", "=r", 4); | |
67 | return ret; | |
68 | case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src, | |
69 | ret, "q", "", "=r", 8); | |
1da177e4 | 70 | return ret; |
1da177e4 | 71 | case 10: |
b896313e | 72 | __get_user_asm(*(u64 *)dst, (u64 __user *)src, |
20a4a236 | 73 | ret, "q", "", "=r", 10); |
b896313e JP |
74 | if (unlikely(ret)) |
75 | return ret; | |
76 | __get_user_asm(*(u16 *)(8 + (char *)dst), | |
77 | (u16 __user *)(8 + (char __user *)src), | |
78 | ret, "w", "w", "=r", 2); | |
79 | return ret; | |
1da177e4 | 80 | case 16: |
b896313e JP |
81 | __get_user_asm(*(u64 *)dst, (u64 __user *)src, |
82 | ret, "q", "", "=r", 16); | |
83 | if (unlikely(ret)) | |
84 | return ret; | |
85 | __get_user_asm(*(u64 *)(8 + (char *)dst), | |
86 | (u64 __user *)(8 + (char __user *)src), | |
87 | ret, "q", "", "=r", 8); | |
88 | return ret; | |
1da177e4 | 89 | default: |
b896313e | 90 | return copy_user_generic(dst, (__force void *)src, size); |
1da177e4 | 91 | } |
b896313e | 92 | } |
1da177e4 | 93 | |
95912008 | 94 | static __always_inline __must_check |
ff47ab4f AK |
95 | int __copy_from_user(void *dst, const void __user *src, unsigned size) |
96 | { | |
97 | might_fault(); | |
98 | return __copy_from_user_nocheck(dst, src, size); | |
99 | } | |
100 | ||
101 | static __always_inline __must_check | |
102 | int __copy_to_user_nocheck(void __user *dst, const void *src, unsigned size) | |
b896313e | 103 | { |
383d079b | 104 | int ret = 0; |
c10d38dd | 105 | |
1da177e4 | 106 | if (!__builtin_constant_p(size)) |
b896313e JP |
107 | return copy_user_generic((__force void *)dst, src, size); |
108 | switch (size) { | |
109 | case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst, | |
110 | ret, "b", "b", "iq", 1); | |
1da177e4 | 111 | return ret; |
b896313e JP |
112 | case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst, |
113 | ret, "w", "w", "ir", 2); | |
1da177e4 | 114 | return ret; |
b896313e JP |
115 | case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst, |
116 | ret, "l", "k", "ir", 4); | |
117 | return ret; | |
118 | case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst, | |
155b7352 | 119 | ret, "q", "", "er", 8); |
1da177e4 | 120 | return ret; |
1da177e4 | 121 | case 10: |
b896313e | 122 | __put_user_asm(*(u64 *)src, (u64 __user *)dst, |
155b7352 | 123 | ret, "q", "", "er", 10); |
b896313e JP |
124 | if (unlikely(ret)) |
125 | return ret; | |
1da177e4 | 126 | asm("":::"memory"); |
b896313e JP |
127 | __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst, |
128 | ret, "w", "w", "ir", 2); | |
129 | return ret; | |
1da177e4 | 130 | case 16: |
b896313e | 131 | __put_user_asm(*(u64 *)src, (u64 __user *)dst, |
155b7352 | 132 | ret, "q", "", "er", 16); |
b896313e JP |
133 | if (unlikely(ret)) |
134 | return ret; | |
1da177e4 | 135 | asm("":::"memory"); |
b896313e | 136 | __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst, |
155b7352 | 137 | ret, "q", "", "er", 8); |
b896313e | 138 | return ret; |
1da177e4 | 139 | default: |
b896313e | 140 | return copy_user_generic((__force void *)dst, src, size); |
1da177e4 | 141 | } |
b896313e | 142 | } |
1da177e4 | 143 | |
ff47ab4f AK |
144 | static __always_inline __must_check |
145 | int __copy_to_user(void __user *dst, const void *src, unsigned size) | |
146 | { | |
147 | might_fault(); | |
148 | return __copy_to_user_nocheck(dst, src, size); | |
149 | } | |
150 | ||
95912008 AK |
151 | static __always_inline __must_check |
152 | int __copy_in_user(void __user *dst, const void __user *src, unsigned size) | |
b896313e | 153 | { |
383d079b | 154 | int ret = 0; |
c10d38dd | 155 | |
3ee1afa3 | 156 | might_fault(); |
1da177e4 | 157 | if (!__builtin_constant_p(size)) |
b896313e JP |
158 | return copy_user_generic((__force void *)dst, |
159 | (__force void *)src, size); | |
160 | switch (size) { | |
161 | case 1: { | |
1da177e4 | 162 | u8 tmp; |
b896313e JP |
163 | __get_user_asm(tmp, (u8 __user *)src, |
164 | ret, "b", "b", "=q", 1); | |
1da177e4 | 165 | if (likely(!ret)) |
b896313e JP |
166 | __put_user_asm(tmp, (u8 __user *)dst, |
167 | ret, "b", "b", "iq", 1); | |
1da177e4 LT |
168 | return ret; |
169 | } | |
b896313e | 170 | case 2: { |
1da177e4 | 171 | u16 tmp; |
b896313e JP |
172 | __get_user_asm(tmp, (u16 __user *)src, |
173 | ret, "w", "w", "=r", 2); | |
1da177e4 | 174 | if (likely(!ret)) |
b896313e JP |
175 | __put_user_asm(tmp, (u16 __user *)dst, |
176 | ret, "w", "w", "ir", 2); | |
1da177e4 LT |
177 | return ret; |
178 | } | |
179 | ||
b896313e | 180 | case 4: { |
1da177e4 | 181 | u32 tmp; |
b896313e JP |
182 | __get_user_asm(tmp, (u32 __user *)src, |
183 | ret, "l", "k", "=r", 4); | |
1da177e4 | 184 | if (likely(!ret)) |
b896313e JP |
185 | __put_user_asm(tmp, (u32 __user *)dst, |
186 | ret, "l", "k", "ir", 4); | |
1da177e4 LT |
187 | return ret; |
188 | } | |
b896313e | 189 | case 8: { |
1da177e4 | 190 | u64 tmp; |
b896313e JP |
191 | __get_user_asm(tmp, (u64 __user *)src, |
192 | ret, "q", "", "=r", 8); | |
1da177e4 | 193 | if (likely(!ret)) |
b896313e | 194 | __put_user_asm(tmp, (u64 __user *)dst, |
155b7352 | 195 | ret, "q", "", "er", 8); |
1da177e4 LT |
196 | return ret; |
197 | } | |
198 | default: | |
b896313e JP |
199 | return copy_user_generic((__force void *)dst, |
200 | (__force void *)src, size); | |
1da177e4 | 201 | } |
b896313e | 202 | } |
1da177e4 | 203 | |
14722485 JB |
204 | static __must_check __always_inline int |
205 | __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size) | |
206 | { | |
df90ca96 | 207 | return __copy_from_user_nocheck(dst, src, size); |
14722485 | 208 | } |
b885808e AK |
209 | |
210 | static __must_check __always_inline int | |
211 | __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size) | |
212 | { | |
df90ca96 | 213 | return __copy_to_user_nocheck(dst, src, size); |
b885808e | 214 | } |
1da177e4 | 215 | |
b896313e JP |
216 | extern long __copy_user_nocache(void *dst, const void __user *src, |
217 | unsigned size, int zerorest); | |
0812a579 | 218 | |
f1800536 IM |
219 | static inline int |
220 | __copy_from_user_nocache(void *dst, const void __user *src, unsigned size) | |
0812a579 | 221 | { |
016be2e5 | 222 | might_fault(); |
f1800536 | 223 | return __copy_user_nocache(dst, src, size, 1); |
0812a579 AK |
224 | } |
225 | ||
f1800536 IM |
226 | static inline int |
227 | __copy_from_user_inatomic_nocache(void *dst, const void __user *src, | |
228 | unsigned size) | |
0812a579 | 229 | { |
f1800536 | 230 | return __copy_user_nocache(dst, src, size, 0); |
0812a579 AK |
231 | } |
232 | ||
1129585a | 233 | unsigned long |
cae2a173 | 234 | copy_user_handle_tail(char *to, char *from, unsigned len); |
1129585a | 235 | |
1965aae3 | 236 | #endif /* _ASM_X86_UACCESS_64_H */ |