Commit | Line | Data |
---|---|---|
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> | |
1da177e4 | 9 | #include <linux/prefetch.h> |
16dbc6c9 | 10 | #include <linux/lockdep.h> |
1da177e4 LT |
11 | #include <asm/page.h> |
12 | ||
1da177e4 LT |
13 | /* |
14 | * Copy To/From Userspace | |
15 | */ | |
16 | ||
17 | /* Handles exceptions in both to and from, but doesn't do access_ok */ | |
95912008 AK |
18 | __must_check unsigned long |
19 | copy_user_generic(void *to, const void *from, unsigned len); | |
20 | ||
21 | __must_check unsigned long | |
3c93ca00 | 22 | _copy_to_user(void __user *to, const void *from, unsigned len); |
95912008 | 23 | __must_check unsigned long |
9f0cf4ad | 24 | _copy_from_user(void *to, const void __user *from, unsigned len); |
95912008 AK |
25 | __must_check unsigned long |
26 | copy_in_user(void __user *to, const void __user *from, unsigned len); | |
27 | ||
9f0cf4ad AV |
28 | static inline unsigned long __must_check copy_from_user(void *to, |
29 | const void __user *from, | |
30 | unsigned long n) | |
31 | { | |
32 | int sz = __compiletime_object_size(to); | |
33 | int ret = -EFAULT; | |
34 | ||
3c93ca00 | 35 | might_fault(); |
9f0cf4ad AV |
36 | if (likely(sz == -1 || sz >= n)) |
37 | ret = _copy_from_user(to, from, n); | |
38 | #ifdef CONFIG_DEBUG_VM | |
39 | else | |
40 | WARN(1, "Buffer overflow detected!\n"); | |
41 | #endif | |
42 | return ret; | |
43 | } | |
44 | ||
3c93ca00 FW |
45 | static __always_inline __must_check |
46 | int copy_to_user(void __user *dst, const void *src, unsigned size) | |
47 | { | |
48 | might_fault(); | |
49 | ||
50 | return _copy_to_user(dst, src, size); | |
51 | } | |
9f0cf4ad | 52 | |
95912008 AK |
53 | static __always_inline __must_check |
54 | int __copy_from_user(void *dst, const void __user *src, unsigned size) | |
b896313e | 55 | { |
383d079b | 56 | int ret = 0; |
c10d38dd | 57 | |
3ee1afa3 | 58 | might_fault(); |
1da177e4 | 59 | if (!__builtin_constant_p(size)) |
b896313e JP |
60 | return copy_user_generic(dst, (__force void *)src, size); |
61 | switch (size) { | |
62 | case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src, | |
63 | ret, "b", "b", "=q", 1); | |
1da177e4 | 64 | return ret; |
b896313e JP |
65 | case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src, |
66 | ret, "w", "w", "=r", 2); | |
1da177e4 | 67 | return ret; |
b896313e JP |
68 | case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src, |
69 | ret, "l", "k", "=r", 4); | |
70 | return ret; | |
71 | case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src, | |
72 | ret, "q", "", "=r", 8); | |
1da177e4 | 73 | return ret; |
1da177e4 | 74 | case 10: |
b896313e | 75 | __get_user_asm(*(u64 *)dst, (u64 __user *)src, |
20a4a236 | 76 | ret, "q", "", "=r", 10); |
b896313e JP |
77 | if (unlikely(ret)) |
78 | return ret; | |
79 | __get_user_asm(*(u16 *)(8 + (char *)dst), | |
80 | (u16 __user *)(8 + (char __user *)src), | |
81 | ret, "w", "w", "=r", 2); | |
82 | return ret; | |
1da177e4 | 83 | case 16: |
b896313e JP |
84 | __get_user_asm(*(u64 *)dst, (u64 __user *)src, |
85 | ret, "q", "", "=r", 16); | |
86 | if (unlikely(ret)) | |
87 | return ret; | |
88 | __get_user_asm(*(u64 *)(8 + (char *)dst), | |
89 | (u64 __user *)(8 + (char __user *)src), | |
90 | ret, "q", "", "=r", 8); | |
91 | return ret; | |
1da177e4 | 92 | default: |
b896313e | 93 | return copy_user_generic(dst, (__force void *)src, size); |
1da177e4 | 94 | } |
b896313e | 95 | } |
1da177e4 | 96 | |
95912008 AK |
97 | static __always_inline __must_check |
98 | int __copy_to_user(void __user *dst, const void *src, unsigned size) | |
b896313e | 99 | { |
383d079b | 100 | int ret = 0; |
c10d38dd | 101 | |
3ee1afa3 | 102 | might_fault(); |
1da177e4 | 103 | if (!__builtin_constant_p(size)) |
b896313e JP |
104 | return copy_user_generic((__force void *)dst, src, size); |
105 | switch (size) { | |
106 | case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst, | |
107 | ret, "b", "b", "iq", 1); | |
1da177e4 | 108 | return ret; |
b896313e JP |
109 | case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst, |
110 | ret, "w", "w", "ir", 2); | |
1da177e4 | 111 | return ret; |
b896313e JP |
112 | case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst, |
113 | ret, "l", "k", "ir", 4); | |
114 | return ret; | |
115 | case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst, | |
155b7352 | 116 | ret, "q", "", "er", 8); |
1da177e4 | 117 | return ret; |
1da177e4 | 118 | case 10: |
b896313e | 119 | __put_user_asm(*(u64 *)src, (u64 __user *)dst, |
155b7352 | 120 | ret, "q", "", "er", 10); |
b896313e JP |
121 | if (unlikely(ret)) |
122 | return ret; | |
1da177e4 | 123 | asm("":::"memory"); |
b896313e JP |
124 | __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst, |
125 | ret, "w", "w", "ir", 2); | |
126 | return ret; | |
1da177e4 | 127 | case 16: |
b896313e | 128 | __put_user_asm(*(u64 *)src, (u64 __user *)dst, |
155b7352 | 129 | ret, "q", "", "er", 16); |
b896313e JP |
130 | if (unlikely(ret)) |
131 | return ret; | |
1da177e4 | 132 | asm("":::"memory"); |
b896313e | 133 | __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst, |
155b7352 | 134 | ret, "q", "", "er", 8); |
b896313e | 135 | return ret; |
1da177e4 | 136 | default: |
b896313e | 137 | return copy_user_generic((__force void *)dst, src, size); |
1da177e4 | 138 | } |
b896313e | 139 | } |
1da177e4 | 140 | |
95912008 AK |
141 | static __always_inline __must_check |
142 | int __copy_in_user(void __user *dst, const void __user *src, unsigned size) | |
b896313e | 143 | { |
383d079b | 144 | int ret = 0; |
c10d38dd | 145 | |
3ee1afa3 | 146 | might_fault(); |
1da177e4 | 147 | if (!__builtin_constant_p(size)) |
b896313e JP |
148 | return copy_user_generic((__force void *)dst, |
149 | (__force void *)src, size); | |
150 | switch (size) { | |
151 | case 1: { | |
1da177e4 | 152 | u8 tmp; |
b896313e JP |
153 | __get_user_asm(tmp, (u8 __user *)src, |
154 | ret, "b", "b", "=q", 1); | |
1da177e4 | 155 | if (likely(!ret)) |
b896313e JP |
156 | __put_user_asm(tmp, (u8 __user *)dst, |
157 | ret, "b", "b", "iq", 1); | |
1da177e4 LT |
158 | return ret; |
159 | } | |
b896313e | 160 | case 2: { |
1da177e4 | 161 | u16 tmp; |
b896313e JP |
162 | __get_user_asm(tmp, (u16 __user *)src, |
163 | ret, "w", "w", "=r", 2); | |
1da177e4 | 164 | if (likely(!ret)) |
b896313e JP |
165 | __put_user_asm(tmp, (u16 __user *)dst, |
166 | ret, "w", "w", "ir", 2); | |
1da177e4 LT |
167 | return ret; |
168 | } | |
169 | ||
b896313e | 170 | case 4: { |
1da177e4 | 171 | u32 tmp; |
b896313e JP |
172 | __get_user_asm(tmp, (u32 __user *)src, |
173 | ret, "l", "k", "=r", 4); | |
1da177e4 | 174 | if (likely(!ret)) |
b896313e JP |
175 | __put_user_asm(tmp, (u32 __user *)dst, |
176 | ret, "l", "k", "ir", 4); | |
1da177e4 LT |
177 | return ret; |
178 | } | |
b896313e | 179 | case 8: { |
1da177e4 | 180 | u64 tmp; |
b896313e JP |
181 | __get_user_asm(tmp, (u64 __user *)src, |
182 | ret, "q", "", "=r", 8); | |
1da177e4 | 183 | if (likely(!ret)) |
b896313e | 184 | __put_user_asm(tmp, (u64 __user *)dst, |
155b7352 | 185 | ret, "q", "", "er", 8); |
1da177e4 LT |
186 | return ret; |
187 | } | |
188 | default: | |
b896313e JP |
189 | return copy_user_generic((__force void *)dst, |
190 | (__force void *)src, size); | |
1da177e4 | 191 | } |
b896313e | 192 | } |
1da177e4 | 193 | |
b896313e | 194 | __must_check long |
95912008 | 195 | strncpy_from_user(char *dst, const char __user *src, long count); |
b896313e | 196 | __must_check long |
95912008 AK |
197 | __strncpy_from_user(char *dst, const char __user *src, long count); |
198 | __must_check long strnlen_user(const char __user *str, long n); | |
199 | __must_check long __strnlen_user(const char __user *str, long n); | |
200 | __must_check long strlen_user(const char __user *str); | |
201 | __must_check unsigned long clear_user(void __user *mem, unsigned long len); | |
202 | __must_check unsigned long __clear_user(void __user *mem, unsigned long len); | |
203 | ||
14722485 JB |
204 | static __must_check __always_inline int |
205 | __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size) | |
206 | { | |
207 | return copy_user_generic(dst, (__force const void *)src, size); | |
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 | { | |
213 | return copy_user_generic((__force void *)dst, src, size); | |
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 AK |
221 | { |
222 | might_sleep(); | |
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 VM |
233 | unsigned long |
234 | copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest); | |
235 | ||
1965aae3 | 236 | #endif /* _ASM_X86_UACCESS_64_H */ |