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 extern void copy_from_user_overflow(void)
47 #ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
48 __compiletime_error("copy_from_user() buffer size is not provably correct")
50 __compiletime_warning("copy_from_user() buffer size is not provably correct")
54 static inline unsigned long __must_check copy_from_user(void *to,
55 const void __user *from,
58 int sz = __compiletime_object_size(to);
61 if (likely(sz == -1 || sz >= n))
62 n = _copy_from_user(to, from, n);
64 copy_from_user_overflow();
68 static __always_inline __must_check
69 int copy_to_user(void __user *dst, const void *src, unsigned size)
73 return _copy_to_user(dst, src, size);
76 static __always_inline __must_check
77 int __copy_from_user(void *dst, const void __user *src, unsigned size)
82 if (!__builtin_constant_p(size))
83 return copy_user_generic(dst, (__force void *)src, size);
85 case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
86 ret, "b", "b", "=q", 1);
88 case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
89 ret, "w", "w", "=r", 2);
91 case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
92 ret, "l", "k", "=r", 4);
94 case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
95 ret, "q", "", "=r", 8);
98 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
99 ret, "q", "", "=r", 10);
102 __get_user_asm(*(u16 *)(8 + (char *)dst),
103 (u16 __user *)(8 + (char __user *)src),
104 ret, "w", "w", "=r", 2);
107 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
108 ret, "q", "", "=r", 16);
111 __get_user_asm(*(u64 *)(8 + (char *)dst),
112 (u64 __user *)(8 + (char __user *)src),
113 ret, "q", "", "=r", 8);
116 return copy_user_generic(dst, (__force void *)src, size);
120 static __always_inline __must_check
121 int __copy_to_user(void __user *dst, const void *src, unsigned size)
126 if (!__builtin_constant_p(size))
127 return copy_user_generic((__force void *)dst, src, size);
129 case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
130 ret, "b", "b", "iq", 1);
132 case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
133 ret, "w", "w", "ir", 2);
135 case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
136 ret, "l", "k", "ir", 4);
138 case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
139 ret, "q", "", "er", 8);
142 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
143 ret, "q", "", "er", 10);
147 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
148 ret, "w", "w", "ir", 2);
151 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
152 ret, "q", "", "er", 16);
156 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
157 ret, "q", "", "er", 8);
160 return copy_user_generic((__force void *)dst, src, size);
164 static __always_inline __must_check
165 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
170 if (!__builtin_constant_p(size))
171 return copy_user_generic((__force void *)dst,
172 (__force void *)src, size);
176 __get_user_asm(tmp, (u8 __user *)src,
177 ret, "b", "b", "=q", 1);
179 __put_user_asm(tmp, (u8 __user *)dst,
180 ret, "b", "b", "iq", 1);
185 __get_user_asm(tmp, (u16 __user *)src,
186 ret, "w", "w", "=r", 2);
188 __put_user_asm(tmp, (u16 __user *)dst,
189 ret, "w", "w", "ir", 2);
195 __get_user_asm(tmp, (u32 __user *)src,
196 ret, "l", "k", "=r", 4);
198 __put_user_asm(tmp, (u32 __user *)dst,
199 ret, "l", "k", "ir", 4);
204 __get_user_asm(tmp, (u64 __user *)src,
205 ret, "q", "", "=r", 8);
207 __put_user_asm(tmp, (u64 __user *)dst,
208 ret, "q", "", "er", 8);
212 return copy_user_generic((__force void *)dst,
213 (__force void *)src, size);
218 strncpy_from_user(char *dst, const char __user *src, long count);
220 __strncpy_from_user(char *dst, const char __user *src, long count);
221 __must_check long strnlen_user(const char __user *str, long n);
222 __must_check long __strnlen_user(const char __user *str, long n);
223 __must_check long strlen_user(const char __user *str);
224 __must_check unsigned long clear_user(void __user *mem, unsigned long len);
225 __must_check unsigned long __clear_user(void __user *mem, unsigned long len);
227 static __must_check __always_inline int
228 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
230 return copy_user_generic(dst, (__force const void *)src, size);
233 static __must_check __always_inline int
234 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
236 return copy_user_generic((__force void *)dst, src, size);
239 extern long __copy_user_nocache(void *dst, const void __user *src,
240 unsigned size, int zerorest);
243 __copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
246 return __copy_user_nocache(dst, src, size, 1);
250 __copy_from_user_inatomic_nocache(void *dst, const void __user *src,
253 return __copy_user_nocache(dst, src, size, 0);
257 copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest);
259 #endif /* _ASM_X86_UACCESS_64_H */