]>
Commit | Line | Data |
---|---|---|
1 | #ifndef _ASM_X86_UACCESS_64_H | |
2 | #define _ASM_X86_UACCESS_64_H | |
3 | ||
4 | /* | |
5 | * User space memory access functions | |
6 | */ | |
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> | |
12 | #include <asm/page.h> | |
13 | ||
14 | /* | |
15 | * Copy To/From Userspace | |
16 | */ | |
17 | ||
18 | /* Handles exceptions in both to and from, but doesn't do access_ok */ | |
19 | __must_check unsigned long | |
20 | copy_user_generic_string(void *to, const void *from, unsigned len); | |
21 | __must_check unsigned long | |
22 | copy_user_generic_unrolled(void *to, const void *from, unsigned len); | |
23 | ||
24 | static __always_inline __must_check unsigned long | |
25 | copy_user_generic(void *to, const void *from, unsigned len) | |
26 | { | |
27 | unsigned ret; | |
28 | ||
29 | alternative_call(copy_user_generic_unrolled, | |
30 | copy_user_generic_string, | |
31 | X86_FEATURE_REP_GOOD, | |
32 | ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from), | |
33 | "=d" (len)), | |
34 | "1" (to), "2" (from), "3" (len) | |
35 | : "memory", "rcx", "r8", "r9", "r10", "r11"); | |
36 | return ret; | |
37 | } | |
38 | ||
39 | __must_check unsigned long | |
40 | _copy_to_user(void __user *to, const void *from, unsigned len); | |
41 | __must_check unsigned long | |
42 | _copy_from_user(void *to, const void __user *from, unsigned len); | |
43 | __must_check unsigned long | |
44 | copy_in_user(void __user *to, const void __user *from, unsigned len); | |
45 | ||
46 | static inline unsigned long __must_check copy_from_user(void *to, | |
47 | const void __user *from, | |
48 | unsigned long n) | |
49 | { | |
50 | int sz = __compiletime_object_size(to); | |
51 | ||
52 | might_fault(); | |
53 | if (likely(sz == -1 || sz >= n)) | |
54 | n = _copy_from_user(to, from, n); | |
55 | #ifdef CONFIG_DEBUG_VM | |
56 | else | |
57 | WARN(1, "Buffer overflow detected!\n"); | |
58 | #endif | |
59 | return n; | |
60 | } | |
61 | ||
62 | static __always_inline __must_check | |
63 | int copy_to_user(void __user *dst, const void *src, unsigned size) | |
64 | { | |
65 | might_fault(); | |
66 | ||
67 | return _copy_to_user(dst, src, size); | |
68 | } | |
69 | ||
70 | static __always_inline __must_check | |
71 | int __copy_from_user(void *dst, const void __user *src, unsigned size) | |
72 | { | |
73 | int ret = 0; | |
74 | ||
75 | might_fault(); | |
76 | if (!__builtin_constant_p(size)) | |
77 | return copy_user_generic(dst, (__force void *)src, size); | |
78 | switch (size) { | |
79 | case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src, | |
80 | ret, "b", "b", "=q", 1); | |
81 | return ret; | |
82 | case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src, | |
83 | ret, "w", "w", "=r", 2); | |
84 | return ret; | |
85 | case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src, | |
86 | ret, "l", "k", "=r", 4); | |
87 | return ret; | |
88 | case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src, | |
89 | ret, "q", "", "=r", 8); | |
90 | return ret; | |
91 | case 10: | |
92 | __get_user_asm(*(u64 *)dst, (u64 __user *)src, | |
93 | ret, "q", "", "=r", 10); | |
94 | if (unlikely(ret)) | |
95 | return ret; | |
96 | __get_user_asm(*(u16 *)(8 + (char *)dst), | |
97 | (u16 __user *)(8 + (char __user *)src), | |
98 | ret, "w", "w", "=r", 2); | |
99 | return ret; | |
100 | case 16: | |
101 | __get_user_asm(*(u64 *)dst, (u64 __user *)src, | |
102 | ret, "q", "", "=r", 16); | |
103 | if (unlikely(ret)) | |
104 | return ret; | |
105 | __get_user_asm(*(u64 *)(8 + (char *)dst), | |
106 | (u64 __user *)(8 + (char __user *)src), | |
107 | ret, "q", "", "=r", 8); | |
108 | return ret; | |
109 | default: | |
110 | return copy_user_generic(dst, (__force void *)src, size); | |
111 | } | |
112 | } | |
113 | ||
114 | static __always_inline __must_check | |
115 | int __copy_to_user(void __user *dst, const void *src, unsigned size) | |
116 | { | |
117 | int ret = 0; | |
118 | ||
119 | might_fault(); | |
120 | if (!__builtin_constant_p(size)) | |
121 | return copy_user_generic((__force void *)dst, src, size); | |
122 | switch (size) { | |
123 | case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst, | |
124 | ret, "b", "b", "iq", 1); | |
125 | return ret; | |
126 | case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst, | |
127 | ret, "w", "w", "ir", 2); | |
128 | return ret; | |
129 | case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst, | |
130 | ret, "l", "k", "ir", 4); | |
131 | return ret; | |
132 | case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst, | |
133 | ret, "q", "", "er", 8); | |
134 | return ret; | |
135 | case 10: | |
136 | __put_user_asm(*(u64 *)src, (u64 __user *)dst, | |
137 | ret, "q", "", "er", 10); | |
138 | if (unlikely(ret)) | |
139 | return ret; | |
140 | asm("":::"memory"); | |
141 | __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst, | |
142 | ret, "w", "w", "ir", 2); | |
143 | return ret; | |
144 | case 16: | |
145 | __put_user_asm(*(u64 *)src, (u64 __user *)dst, | |
146 | ret, "q", "", "er", 16); | |
147 | if (unlikely(ret)) | |
148 | return ret; | |
149 | asm("":::"memory"); | |
150 | __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst, | |
151 | ret, "q", "", "er", 8); | |
152 | return ret; | |
153 | default: | |
154 | return copy_user_generic((__force void *)dst, src, size); | |
155 | } | |
156 | } | |
157 | ||
158 | static __always_inline __must_check | |
159 | int __copy_in_user(void __user *dst, const void __user *src, unsigned size) | |
160 | { | |
161 | int ret = 0; | |
162 | ||
163 | might_fault(); | |
164 | if (!__builtin_constant_p(size)) | |
165 | return copy_user_generic((__force void *)dst, | |
166 | (__force void *)src, size); | |
167 | switch (size) { | |
168 | case 1: { | |
169 | u8 tmp; | |
170 | __get_user_asm(tmp, (u8 __user *)src, | |
171 | ret, "b", "b", "=q", 1); | |
172 | if (likely(!ret)) | |
173 | __put_user_asm(tmp, (u8 __user *)dst, | |
174 | ret, "b", "b", "iq", 1); | |
175 | return ret; | |
176 | } | |
177 | case 2: { | |
178 | u16 tmp; | |
179 | __get_user_asm(tmp, (u16 __user *)src, | |
180 | ret, "w", "w", "=r", 2); | |
181 | if (likely(!ret)) | |
182 | __put_user_asm(tmp, (u16 __user *)dst, | |
183 | ret, "w", "w", "ir", 2); | |
184 | return ret; | |
185 | } | |
186 | ||
187 | case 4: { | |
188 | u32 tmp; | |
189 | __get_user_asm(tmp, (u32 __user *)src, | |
190 | ret, "l", "k", "=r", 4); | |
191 | if (likely(!ret)) | |
192 | __put_user_asm(tmp, (u32 __user *)dst, | |
193 | ret, "l", "k", "ir", 4); | |
194 | return ret; | |
195 | } | |
196 | case 8: { | |
197 | u64 tmp; | |
198 | __get_user_asm(tmp, (u64 __user *)src, | |
199 | ret, "q", "", "=r", 8); | |
200 | if (likely(!ret)) | |
201 | __put_user_asm(tmp, (u64 __user *)dst, | |
202 | ret, "q", "", "er", 8); | |
203 | return ret; | |
204 | } | |
205 | default: | |
206 | return copy_user_generic((__force void *)dst, | |
207 | (__force void *)src, size); | |
208 | } | |
209 | } | |
210 | ||
211 | __must_check long | |
212 | strncpy_from_user(char *dst, const char __user *src, long count); | |
213 | __must_check long | |
214 | __strncpy_from_user(char *dst, const char __user *src, long count); | |
215 | __must_check long strnlen_user(const char __user *str, long n); | |
216 | __must_check long __strnlen_user(const char __user *str, long n); | |
217 | __must_check long strlen_user(const char __user *str); | |
218 | __must_check unsigned long clear_user(void __user *mem, unsigned long len); | |
219 | __must_check unsigned long __clear_user(void __user *mem, unsigned long len); | |
220 | ||
221 | static __must_check __always_inline int | |
222 | __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size) | |
223 | { | |
224 | return copy_user_generic(dst, (__force const void *)src, size); | |
225 | } | |
226 | ||
227 | static __must_check __always_inline int | |
228 | __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size) | |
229 | { | |
230 | return copy_user_generic((__force void *)dst, src, size); | |
231 | } | |
232 | ||
233 | extern long __copy_user_nocache(void *dst, const void __user *src, | |
234 | unsigned size, int zerorest); | |
235 | ||
236 | static inline int | |
237 | __copy_from_user_nocache(void *dst, const void __user *src, unsigned size) | |
238 | { | |
239 | might_sleep(); | |
240 | return __copy_user_nocache(dst, src, size, 1); | |
241 | } | |
242 | ||
243 | static inline int | |
244 | __copy_from_user_inatomic_nocache(void *dst, const void __user *src, | |
245 | unsigned size) | |
246 | { | |
247 | return __copy_user_nocache(dst, src, size, 0); | |
248 | } | |
249 | ||
250 | unsigned long | |
251 | copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest); | |
252 | ||
253 | #endif /* _ASM_X86_UACCESS_64_H */ |