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_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);
24 static __always_inline __must_check unsigned long
25 copy_user_generic(void *to, const void *from, unsigned len)
29 alternative_call(copy_user_generic_unrolled,
30 copy_user_generic_string,
32 ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
34 "1" (to), "2" (from), "3" (len)
35 : "memory", "rcx", "r8", "r9", "r10", "r11");
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);
46 static inline unsigned long __must_check copy_from_user(void *to,
47 const void __user *from,
50 int sz = __compiletime_object_size(to);
53 if (likely(sz == -1 || sz >= n))
54 n = _copy_from_user(to, from, n);
55 #ifdef CONFIG_DEBUG_VM
57 WARN(1, "Buffer overflow detected!\n");
62 static __always_inline __must_check
63 int copy_to_user(void __user *dst, const void *src, unsigned size)
67 return _copy_to_user(dst, src, size);
70 static __always_inline __must_check
71 int __copy_from_user_nocheck(void *dst, const void __user *src, unsigned size)
75 if (!__builtin_constant_p(size))
76 return copy_user_generic(dst, (__force void *)src, size);
78 case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
79 ret, "b", "b", "=q", 1);
81 case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
82 ret, "w", "w", "=r", 2);
84 case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
85 ret, "l", "k", "=r", 4);
87 case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
88 ret, "q", "", "=r", 8);
91 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
92 ret, "q", "", "=r", 10);
95 __get_user_asm(*(u16 *)(8 + (char *)dst),
96 (u16 __user *)(8 + (char __user *)src),
97 ret, "w", "w", "=r", 2);
100 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
101 ret, "q", "", "=r", 16);
104 __get_user_asm(*(u64 *)(8 + (char *)dst),
105 (u64 __user *)(8 + (char __user *)src),
106 ret, "q", "", "=r", 8);
109 return copy_user_generic(dst, (__force void *)src, size);
113 static __always_inline __must_check
114 int __copy_from_user(void *dst, const void __user *src, unsigned size)
117 return __copy_from_user_nocheck(dst, src, size);
120 static __always_inline __must_check
121 int __copy_to_user_nocheck(void __user *dst, const void *src, unsigned size)
125 if (!__builtin_constant_p(size))
126 return copy_user_generic((__force void *)dst, src, size);
128 case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
129 ret, "b", "b", "iq", 1);
131 case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
132 ret, "w", "w", "ir", 2);
134 case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
135 ret, "l", "k", "ir", 4);
137 case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
138 ret, "q", "", "er", 8);
141 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
142 ret, "q", "", "er", 10);
146 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
147 ret, "w", "w", "ir", 2);
150 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
151 ret, "q", "", "er", 16);
155 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
156 ret, "q", "", "er", 8);
159 return copy_user_generic((__force void *)dst, src, size);
163 static __always_inline __must_check
164 int __copy_to_user(void __user *dst, const void *src, unsigned size)
167 return __copy_to_user_nocheck(dst, src, size);
170 static __always_inline __must_check
171 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
176 if (!__builtin_constant_p(size))
177 return copy_user_generic((__force void *)dst,
178 (__force void *)src, size);
182 __get_user_asm(tmp, (u8 __user *)src,
183 ret, "b", "b", "=q", 1);
185 __put_user_asm(tmp, (u8 __user *)dst,
186 ret, "b", "b", "iq", 1);
191 __get_user_asm(tmp, (u16 __user *)src,
192 ret, "w", "w", "=r", 2);
194 __put_user_asm(tmp, (u16 __user *)dst,
195 ret, "w", "w", "ir", 2);
201 __get_user_asm(tmp, (u32 __user *)src,
202 ret, "l", "k", "=r", 4);
204 __put_user_asm(tmp, (u32 __user *)dst,
205 ret, "l", "k", "ir", 4);
210 __get_user_asm(tmp, (u64 __user *)src,
211 ret, "q", "", "=r", 8);
213 __put_user_asm(tmp, (u64 __user *)dst,
214 ret, "q", "", "er", 8);
218 return copy_user_generic((__force void *)dst,
219 (__force void *)src, size);
224 strncpy_from_user(char *dst, const char __user *src, long count);
226 __strncpy_from_user(char *dst, const char __user *src, long count);
227 __must_check long strnlen_user(const char __user *str, long n);
228 __must_check long __strnlen_user(const char __user *str, long n);
229 __must_check long strlen_user(const char __user *str);
230 __must_check unsigned long clear_user(void __user *mem, unsigned long len);
231 __must_check unsigned long __clear_user(void __user *mem, unsigned long len);
233 static __must_check __always_inline int
234 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
236 return __copy_from_user_nocheck(dst, (__force const void *)src, size);
239 static __must_check __always_inline int
240 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
242 return __copy_to_user_nocheck((__force void *)dst, src, size);
245 extern long __copy_user_nocache(void *dst, const void __user *src,
246 unsigned size, int zerorest);
249 __copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
252 return __copy_user_nocache(dst, src, size, 1);
256 __copy_from_user_inatomic_nocache(void *dst, const void __user *src,
259 return __copy_user_nocache(dst, src, size, 0);
263 copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest);
265 #endif /* _ASM_X86_UACCESS_64_H */