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 <linux/kasan-checks.h>
11 #include <asm/alternative.h>
12 #include <asm/cpufeatures.h>
16 * Copy To/From Userspace
19 /* Handles exceptions in both to and from, but doesn't do access_ok */
20 __must_check unsigned long
21 copy_user_enhanced_fast_string(void *to, const void *from, unsigned len);
22 __must_check unsigned long
23 copy_user_generic_string(void *to, const void *from, unsigned len);
24 __must_check unsigned long
25 copy_user_generic_unrolled(void *to, const void *from, unsigned len);
27 static __always_inline __must_check unsigned long
28 copy_user_generic(void *to, const void *from, unsigned len)
33 * If CPU has ERMS feature, use copy_user_enhanced_fast_string.
34 * Otherwise, if CPU has rep_good feature, use copy_user_generic_string.
35 * Otherwise, use copy_user_generic_unrolled.
37 alternative_call_2(copy_user_generic_unrolled,
38 copy_user_generic_string,
40 copy_user_enhanced_fast_string,
42 ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
44 "1" (to), "2" (from), "3" (len)
45 : "memory", "rcx", "r8", "r9", "r10", "r11");
49 __must_check unsigned long
50 copy_in_user(void __user *to, const void __user *from, unsigned len);
52 static __always_inline __must_check
53 int __copy_from_user_nocheck(void *dst, const void __user *src, unsigned size)
57 check_object_size(dst, size, false);
58 if (!__builtin_constant_p(size))
59 return copy_user_generic(dst, (__force void *)src, size);
63 __get_user_asm(*(u8 *)dst, (u8 __user *)src,
64 ret, "b", "b", "=q", 1);
69 __get_user_asm(*(u16 *)dst, (u16 __user *)src,
70 ret, "w", "w", "=r", 2);
75 __get_user_asm(*(u32 *)dst, (u32 __user *)src,
76 ret, "l", "k", "=r", 4);
81 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
82 ret, "q", "", "=r", 8);
87 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
88 ret, "q", "", "=r", 10);
90 __get_user_asm(*(u16 *)(8 + (char *)dst),
91 (u16 __user *)(8 + (char __user *)src),
92 ret, "w", "w", "=r", 2);
97 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
98 ret, "q", "", "=r", 16);
100 __get_user_asm(*(u64 *)(8 + (char *)dst),
101 (u64 __user *)(8 + (char __user *)src),
102 ret, "q", "", "=r", 8);
106 return copy_user_generic(dst, (__force void *)src, size);
110 static __always_inline __must_check
111 int __copy_from_user(void *dst, const void __user *src, unsigned size)
114 kasan_check_write(dst, size);
115 return __copy_from_user_nocheck(dst, src, size);
118 static __always_inline __must_check
119 int __copy_to_user_nocheck(void __user *dst, const void *src, unsigned size)
123 check_object_size(src, size, true);
124 if (!__builtin_constant_p(size))
125 return copy_user_generic((__force void *)dst, src, size);
129 __put_user_asm(*(u8 *)src, (u8 __user *)dst,
130 ret, "b", "b", "iq", 1);
135 __put_user_asm(*(u16 *)src, (u16 __user *)dst,
136 ret, "w", "w", "ir", 2);
141 __put_user_asm(*(u32 *)src, (u32 __user *)dst,
142 ret, "l", "k", "ir", 4);
147 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
148 ret, "q", "", "er", 8);
153 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
154 ret, "q", "", "er", 10);
157 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
158 ret, "w", "w", "ir", 2);
164 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
165 ret, "q", "", "er", 16);
168 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
169 ret, "q", "", "er", 8);
174 return copy_user_generic((__force void *)dst, src, size);
178 static __always_inline __must_check
179 int __copy_to_user(void __user *dst, const void *src, unsigned size)
182 kasan_check_read(src, size);
183 return __copy_to_user_nocheck(dst, src, size);
186 static __always_inline __must_check
187 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
192 if (!__builtin_constant_p(size))
193 return copy_user_generic((__force void *)dst,
194 (__force void *)src, size);
199 __get_user_asm(tmp, (u8 __user *)src,
200 ret, "b", "b", "=q", 1);
202 __put_user_asm(tmp, (u8 __user *)dst,
203 ret, "b", "b", "iq", 1);
210 __get_user_asm(tmp, (u16 __user *)src,
211 ret, "w", "w", "=r", 2);
213 __put_user_asm(tmp, (u16 __user *)dst,
214 ret, "w", "w", "ir", 2);
222 __get_user_asm(tmp, (u32 __user *)src,
223 ret, "l", "k", "=r", 4);
225 __put_user_asm(tmp, (u32 __user *)dst,
226 ret, "l", "k", "ir", 4);
233 __get_user_asm(tmp, (u64 __user *)src,
234 ret, "q", "", "=r", 8);
236 __put_user_asm(tmp, (u64 __user *)dst,
237 ret, "q", "", "er", 8);
242 return copy_user_generic((__force void *)dst,
243 (__force void *)src, size);
247 static __must_check __always_inline int
248 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
250 kasan_check_write(dst, size);
251 return __copy_from_user_nocheck(dst, src, size);
254 static __must_check __always_inline int
255 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
257 kasan_check_read(src, size);
258 return __copy_to_user_nocheck(dst, src, size);
261 extern long __copy_user_nocache(void *dst, const void __user *src,
262 unsigned size, int zerorest);
265 __copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
268 kasan_check_write(dst, size);
269 return __copy_user_nocache(dst, src, size, 1);
273 __copy_from_user_inatomic_nocache(void *dst, const void __user *src,
276 kasan_check_write(dst, size);
277 return __copy_user_nocache(dst, src, size, 0);
281 copy_user_handle_tail(char *to, char *from, unsigned len);
283 #endif /* _ASM_X86_UACCESS_64_H */