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/lockdep.h>
9 #include <linux/kasan-checks.h>
10 #include <asm/alternative.h>
11 #include <asm/cpufeatures.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_enhanced_fast_string(void *to, const void *from, unsigned len);
21 __must_check unsigned long
22 copy_user_generic_string(void *to, const void *from, unsigned len);
23 __must_check unsigned long
24 copy_user_generic_unrolled(void *to, const void *from, unsigned len);
26 static __always_inline __must_check unsigned long
27 copy_user_generic(void *to, const void *from, unsigned len)
32 * If CPU has ERMS feature, use copy_user_enhanced_fast_string.
33 * Otherwise, if CPU has rep_good feature, use copy_user_generic_string.
34 * Otherwise, use copy_user_generic_unrolled.
36 alternative_call_2(copy_user_generic_unrolled,
37 copy_user_generic_string,
39 copy_user_enhanced_fast_string,
41 ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
43 "1" (to), "2" (from), "3" (len)
44 : "memory", "rcx", "r8", "r9", "r10", "r11");
48 static __always_inline __must_check unsigned long
49 raw_copy_from_user(void *dst, const void __user *src, unsigned long size)
53 if (!__builtin_constant_p(size))
54 return copy_user_generic(dst, (__force void *)src, size);
58 __get_user_asm_nozero(*(u8 *)dst, (u8 __user *)src,
59 ret, "b", "b", "=q", 1);
64 __get_user_asm_nozero(*(u16 *)dst, (u16 __user *)src,
65 ret, "w", "w", "=r", 2);
70 __get_user_asm_nozero(*(u32 *)dst, (u32 __user *)src,
71 ret, "l", "k", "=r", 4);
76 __get_user_asm_nozero(*(u64 *)dst, (u64 __user *)src,
77 ret, "q", "", "=r", 8);
82 __get_user_asm_nozero(*(u64 *)dst, (u64 __user *)src,
83 ret, "q", "", "=r", 10);
85 __get_user_asm_nozero(*(u16 *)(8 + (char *)dst),
86 (u16 __user *)(8 + (char __user *)src),
87 ret, "w", "w", "=r", 2);
92 __get_user_asm_nozero(*(u64 *)dst, (u64 __user *)src,
93 ret, "q", "", "=r", 16);
95 __get_user_asm_nozero(*(u64 *)(8 + (char *)dst),
96 (u64 __user *)(8 + (char __user *)src),
97 ret, "q", "", "=r", 8);
101 return copy_user_generic(dst, (__force void *)src, size);
105 static __always_inline __must_check unsigned long
106 raw_copy_to_user(void __user *dst, const void *src, unsigned long size)
110 if (!__builtin_constant_p(size))
111 return copy_user_generic((__force void *)dst, src, size);
115 __put_user_asm(*(u8 *)src, (u8 __user *)dst,
116 ret, "b", "b", "iq", 1);
121 __put_user_asm(*(u16 *)src, (u16 __user *)dst,
122 ret, "w", "w", "ir", 2);
127 __put_user_asm(*(u32 *)src, (u32 __user *)dst,
128 ret, "l", "k", "ir", 4);
133 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
134 ret, "q", "", "er", 8);
139 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
140 ret, "q", "", "er", 10);
143 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
144 ret, "w", "w", "ir", 2);
150 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
151 ret, "q", "", "er", 16);
154 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
155 ret, "q", "", "er", 8);
160 return copy_user_generic((__force void *)dst, src, size);
164 static __always_inline __must_check
165 unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long size)
167 return copy_user_generic((__force void *)dst,
168 (__force void *)src, size);
171 extern long __copy_user_nocache(void *dst, const void __user *src,
172 unsigned size, int zerorest);
175 __copy_from_user_inatomic_nocache(void *dst, const void __user *src,
178 kasan_check_write(dst, size);
179 return __copy_user_nocache(dst, src, size, 0);
183 copy_user_handle_tail(char *to, char *from, unsigned len);
185 #endif /* _ASM_X86_UACCESS_64_H */