1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_STRING_64_H
3#define _ASM_X86_STRING_64_H
4
5#ifdef __KERNEL__
6#include <linux/jump_label.h>
7
8/* Written 2002 by Andi Kleen */
9
10/* Even with __builtin_ the compiler may decide to use the out of line
11 function. */
12
13#define __HAVE_ARCH_MEMCPY 1
14extern void *memcpy(void *to, const void *from, size_t len);
15extern void *__memcpy(void *to, const void *from, size_t len);
16
17#define __HAVE_ARCH_MEMSET
18void *memset(void *s, int c, size_t n);
19void *__memset(void *s, int c, size_t n);
20
21#define __HAVE_ARCH_MEMSET16
22static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
23{
24 long d0, d1;
25 asm volatile("rep\n\t"
26 "stosw"
27 : "=&c" (d0), "=&D" (d1)
28 : "a" (v), "1" (s), "0" (n)
29 : "memory");
30 return s;
31}
32
33#define __HAVE_ARCH_MEMSET32
34static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
35{
36 long d0, d1;
37 asm volatile("rep\n\t"
38 "stosl"
39 : "=&c" (d0), "=&D" (d1)
40 : "a" (v), "1" (s), "0" (n)
41 : "memory");
42 return s;
43}
44
45#define __HAVE_ARCH_MEMSET64
46static inline void *memset64(uint64_t *s, uint64_t v, size_t n)
47{
48 long d0, d1;
49 asm volatile("rep\n\t"
50 "stosq"
51 : "=&c" (d0), "=&D" (d1)
52 : "a" (v), "1" (s), "0" (n)
53 : "memory");
54 return s;
55}
56
57#define __HAVE_ARCH_MEMMOVE
58void *memmove(void *dest, const void *src, size_t count);
59void *__memmove(void *dest, const void *src, size_t count);
60
61int memcmp(const void *cs, const void *ct, size_t count);
62size_t strlen(const char *s);
63char *strcpy(char *dest, const char *src);
64char *strcat(char *dest, const char *src);
65int strcmp(const char *cs, const char *ct);
66
67#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
68
69/*
70 * For files that not instrumented (e.g. mm/slub.c) we
71 * should use not instrumented version of mem* functions.
72 */
73
74#undef memcpy
75#define memcpy(dst, src, len) __memcpy(dst, src, len)
76#define memmove(dst, src, len) __memmove(dst, src, len)
77#define memset(s, c, n) __memset(s, c, n)
78
79#ifndef __NO_FORTIFY
80#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
81#endif
82
83#endif
84
85#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
86#define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
87void __memcpy_flushcache(void *dst, const void *src, size_t cnt);
88static __always_inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
89{
90 if (__builtin_constant_p(cnt)) {
91 switch (cnt) {
92 case 4:
93 asm ("movntil %1, %0" : "=m"(*(u32 *)dst) : "r"(*(u32 *)src));
94 return;
95 case 8:
96 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
97 return;
98 case 16:
99 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
100 asm ("movntiq %1, %0" : "=m"(*(u64 *)(dst + 8)) : "r"(*(u64 *)(src + 8)));
101 return;
102 }
103 }
104 __memcpy_flushcache(dst, src, cnt);
105}
106#endif
107
108#endif /* __KERNEL__ */
109
110#endif /* _ASM_X86_STRING_64_H */
111

source code of linux/arch/x86/include/asm/string_64.h