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/prefetch.h>
10 #include <linux/lockdep.h>
11 #include <asm/page.h>
12
13 /*
14 * Copy To/From Userspace
15 */
16
17 /* Handles exceptions in both to and from, but doesn't do access_ok */
18 __must_check unsigned long
19 copy_user_generic(void *to, const void *from, unsigned len);
20
21 __must_check unsigned long
22 copy_to_user(void __user *to, const void *from, unsigned len);
23 __must_check unsigned long
24 copy_from_user(void *to, const void __user *from, unsigned len);
25 __must_check unsigned long
26 copy_in_user(void __user *to, const void __user *from, unsigned len);
27
28 static __always_inline __must_check
__copy_from_user(void * dst,const void __user * src,unsigned size)29 int __copy_from_user(void *dst, const void __user *src, unsigned size)
30 {
31 int ret = 0;
32
33 might_fault();
34 if (!__builtin_constant_p(size))
35 return copy_user_generic(dst, (__force void *)src, size);
36 switch (size) {
37 case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
38 ret, "b", "b", "=q", 1);
39 return ret;
40 case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
41 ret, "w", "w", "=r", 2);
42 return ret;
43 case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
44 ret, "l", "k", "=r", 4);
45 return ret;
46 case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
47 ret, "q", "", "=r", 8);
48 return ret;
49 case 10:
50 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
51 ret, "q", "", "=r", 10);
52 if (unlikely(ret))
53 return ret;
54 __get_user_asm(*(u16 *)(8 + (char *)dst),
55 (u16 __user *)(8 + (char __user *)src),
56 ret, "w", "w", "=r", 2);
57 return ret;
58 case 16:
59 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
60 ret, "q", "", "=r", 16);
61 if (unlikely(ret))
62 return ret;
63 __get_user_asm(*(u64 *)(8 + (char *)dst),
64 (u64 __user *)(8 + (char __user *)src),
65 ret, "q", "", "=r", 8);
66 return ret;
67 default:
68 return copy_user_generic(dst, (__force void *)src, size);
69 }
70 }
71
72 static __always_inline __must_check
__copy_to_user(void __user * dst,const void * src,unsigned size)73 int __copy_to_user(void __user *dst, const void *src, unsigned size)
74 {
75 int ret = 0;
76
77 might_fault();
78 if (!__builtin_constant_p(size))
79 return copy_user_generic((__force void *)dst, src, size);
80 switch (size) {
81 case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
82 ret, "b", "b", "iq", 1);
83 return ret;
84 case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
85 ret, "w", "w", "ir", 2);
86 return ret;
87 case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
88 ret, "l", "k", "ir", 4);
89 return ret;
90 case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
91 ret, "q", "", "ir", 8);
92 return ret;
93 case 10:
94 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
95 ret, "q", "", "ir", 10);
96 if (unlikely(ret))
97 return ret;
98 asm("":::"memory");
99 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
100 ret, "w", "w", "ir", 2);
101 return ret;
102 case 16:
103 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
104 ret, "q", "", "ir", 16);
105 if (unlikely(ret))
106 return ret;
107 asm("":::"memory");
108 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
109 ret, "q", "", "ir", 8);
110 return ret;
111 default:
112 return copy_user_generic((__force void *)dst, src, size);
113 }
114 }
115
116 static __always_inline __must_check
__copy_in_user(void __user * dst,const void __user * src,unsigned size)117 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
118 {
119 int ret = 0;
120
121 might_fault();
122 if (!__builtin_constant_p(size))
123 return copy_user_generic((__force void *)dst,
124 (__force void *)src, size);
125 switch (size) {
126 case 1: {
127 u8 tmp;
128 __get_user_asm(tmp, (u8 __user *)src,
129 ret, "b", "b", "=q", 1);
130 if (likely(!ret))
131 __put_user_asm(tmp, (u8 __user *)dst,
132 ret, "b", "b", "iq", 1);
133 return ret;
134 }
135 case 2: {
136 u16 tmp;
137 __get_user_asm(tmp, (u16 __user *)src,
138 ret, "w", "w", "=r", 2);
139 if (likely(!ret))
140 __put_user_asm(tmp, (u16 __user *)dst,
141 ret, "w", "w", "ir", 2);
142 return ret;
143 }
144
145 case 4: {
146 u32 tmp;
147 __get_user_asm(tmp, (u32 __user *)src,
148 ret, "l", "k", "=r", 4);
149 if (likely(!ret))
150 __put_user_asm(tmp, (u32 __user *)dst,
151 ret, "l", "k", "ir", 4);
152 return ret;
153 }
154 case 8: {
155 u64 tmp;
156 __get_user_asm(tmp, (u64 __user *)src,
157 ret, "q", "", "=r", 8);
158 if (likely(!ret))
159 __put_user_asm(tmp, (u64 __user *)dst,
160 ret, "q", "", "ir", 8);
161 return ret;
162 }
163 default:
164 return copy_user_generic((__force void *)dst,
165 (__force void *)src, size);
166 }
167 }
168
169 __must_check long
170 strncpy_from_user(char *dst, const char __user *src, long count);
171 __must_check long
172 __strncpy_from_user(char *dst, const char __user *src, long count);
173 __must_check long strnlen_user(const char __user *str, long n);
174 __must_check long __strnlen_user(const char __user *str, long n);
175 __must_check long strlen_user(const char __user *str);
176 __must_check unsigned long clear_user(void __user *mem, unsigned long len);
177 __must_check unsigned long __clear_user(void __user *mem, unsigned long len);
178
179 __must_check long __copy_from_user_inatomic(void *dst, const void __user *src,
180 unsigned size);
181
182 static __must_check __always_inline int
__copy_to_user_inatomic(void __user * dst,const void * src,unsigned size)183 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
184 {
185 return copy_user_generic((__force void *)dst, src, size);
186 }
187
188 extern long __copy_user_nocache(void *dst, const void __user *src,
189 unsigned size, int zerorest);
190
__copy_from_user_nocache(void * dst,const void __user * src,unsigned size)191 static inline int __copy_from_user_nocache(void *dst, const void __user *src,
192 unsigned size)
193 {
194 might_sleep();
195 return __copy_user_nocache(dst, src, size, 1);
196 }
197
__copy_from_user_inatomic_nocache(void * dst,const void __user * src,unsigned size)198 static inline int __copy_from_user_inatomic_nocache(void *dst,
199 const void __user *src,
200 unsigned size)
201 {
202 return __copy_user_nocache(dst, src, size, 0);
203 }
204
205 unsigned long
206 copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest);
207
208 #endif /* _ASM_X86_UACCESS_64_H */
209