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(void *dst, const void __user *src, unsigned size)
76 if (!__builtin_constant_p(size))
77 return copy_user_generic(dst, (__force void *)src, size);
79 case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
80 ret, "b", "b", "=q", 1);
82 case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
83 ret, "w", "w", "=r", 2);
85 case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
86 ret, "l", "k", "=r", 4);
88 case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
89 ret, "q", "", "=r", 8);
92 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
93 ret, "q", "", "=r", 10);
96 __get_user_asm(*(u16 *)(8 + (char *)dst),
97 (u16 __user *)(8 + (char __user *)src),
98 ret, "w", "w", "=r", 2);
101 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
102 ret, "q", "", "=r", 16);
105 __get_user_asm(*(u64 *)(8 + (char *)dst),
106 (u64 __user *)(8 + (char __user *)src),
107 ret, "q", "", "=r", 8);
110 return copy_user_generic(dst, (__force void *)src, size);
114 static __always_inline __must_check
115 int __copy_to_user(void __user *dst, const void *src, unsigned size)
120 if (!__builtin_constant_p(size))
121 return copy_user_generic((__force void *)dst, src, size);
123 case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
124 ret, "b", "b", "iq", 1);
126 case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
127 ret, "w", "w", "ir", 2);
129 case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
130 ret, "l", "k", "ir", 4);
132 case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
133 ret, "q", "", "er", 8);
136 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
137 ret, "q", "", "er", 10);
141 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
142 ret, "w", "w", "ir", 2);
145 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
146 ret, "q", "", "er", 16);
150 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
151 ret, "q", "", "er", 8);
154 return copy_user_generic((__force void *)dst, src, size);
158 static __always_inline __must_check
159 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
164 if (!__builtin_constant_p(size))
165 return copy_user_generic((__force void *)dst,
166 (__force void *)src, size);
170 __get_user_asm(tmp, (u8 __user *)src,
171 ret, "b", "b", "=q", 1);
173 __put_user_asm(tmp, (u8 __user *)dst,
174 ret, "b", "b", "iq", 1);
179 __get_user_asm(tmp, (u16 __user *)src,
180 ret, "w", "w", "=r", 2);
182 __put_user_asm(tmp, (u16 __user *)dst,
183 ret, "w", "w", "ir", 2);
189 __get_user_asm(tmp, (u32 __user *)src,
190 ret, "l", "k", "=r", 4);
192 __put_user_asm(tmp, (u32 __user *)dst,
193 ret, "l", "k", "ir", 4);
198 __get_user_asm(tmp, (u64 __user *)src,
199 ret, "q", "", "=r", 8);
201 __put_user_asm(tmp, (u64 __user *)dst,
202 ret, "q", "", "er", 8);
206 return copy_user_generic((__force void *)dst,
207 (__force void *)src, size);
212 strncpy_from_user(char *dst, const char __user *src, long count);
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);
221 static __must_check __always_inline int
222 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
224 return copy_user_generic(dst, (__force const void *)src, size);
227 static __must_check __always_inline int
228 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
230 return copy_user_generic((__force void *)dst, src, size);
233 extern long __copy_user_nocache(void *dst, const void __user *src,
234 unsigned size, int zerorest);
237 __copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
240 return __copy_user_nocache(dst, src, size, 1);
244 __copy_from_user_inatomic_nocache(void *dst, const void __user *src,
247 return __copy_user_nocache(dst, src, size, 0);
251 copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest);
253 #endif /* _ASM_X86_UACCESS_64_H */