Linux kernel mirror (for testing)
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linux
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#if defined(__SANITIZE_MEMORY__) && defined(__NO_FORTIFY)
14#include <linux/kmsan_string.h>
15#endif
16
17#define __HAVE_ARCH_MEMCPY 1
18#if defined(__SANITIZE_MEMORY__) && defined(__NO_FORTIFY)
19#undef memcpy
20#define memcpy __msan_memcpy
21#else
22extern void *memcpy(void *to, const void *from, size_t len);
23#endif
24extern void *__memcpy(void *to, const void *from, size_t len);
25
26#define __HAVE_ARCH_MEMSET
27#if defined(__SANITIZE_MEMORY__) && defined(__NO_FORTIFY)
28extern void *__msan_memset(void *s, int c, size_t n);
29#undef memset
30#define memset __msan_memset
31#else
32void *memset(void *s, int c, size_t n);
33#endif
34void *__memset(void *s, int c, size_t n);
35
36#define __HAVE_ARCH_MEMSET16
37static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
38{
39 long d0, d1;
40 asm volatile("rep\n\t"
41 "stosw"
42 : "=&c" (d0), "=&D" (d1)
43 : "a" (v), "1" (s), "0" (n)
44 : "memory");
45 return s;
46}
47
48#define __HAVE_ARCH_MEMSET32
49static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
50{
51 long d0, d1;
52 asm volatile("rep\n\t"
53 "stosl"
54 : "=&c" (d0), "=&D" (d1)
55 : "a" (v), "1" (s), "0" (n)
56 : "memory");
57 return s;
58}
59
60#define __HAVE_ARCH_MEMSET64
61static inline void *memset64(uint64_t *s, uint64_t v, size_t n)
62{
63 long d0, d1;
64 asm volatile("rep\n\t"
65 "stosq"
66 : "=&c" (d0), "=&D" (d1)
67 : "a" (v), "1" (s), "0" (n)
68 : "memory");
69 return s;
70}
71
72#define __HAVE_ARCH_MEMMOVE
73#if defined(__SANITIZE_MEMORY__) && defined(__NO_FORTIFY)
74#undef memmove
75void *__msan_memmove(void *dest, const void *src, size_t len);
76#define memmove __msan_memmove
77#else
78void *memmove(void *dest, const void *src, size_t count);
79#endif
80void *__memmove(void *dest, const void *src, size_t count);
81
82int memcmp(const void *cs, const void *ct, size_t count);
83size_t strlen(const char *s);
84char *strcpy(char *dest, const char *src);
85char *strcat(char *dest, const char *src);
86int strcmp(const char *cs, const char *ct);
87
88#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
89#define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
90void __memcpy_flushcache(void *dst, const void *src, size_t cnt);
91static __always_inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
92{
93 if (__builtin_constant_p(cnt)) {
94 switch (cnt) {
95 case 4:
96 asm ("movntil %1, %0" : "=m"(*(u32 *)dst) : "r"(*(u32 *)src));
97 return;
98 case 8:
99 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
100 return;
101 case 16:
102 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
103 asm ("movntiq %1, %0" : "=m"(*(u64 *)(dst + 8)) : "r"(*(u64 *)(src + 8)));
104 return;
105 }
106 }
107 __memcpy_flushcache(dst, src, cnt);
108}
109#endif
110
111#endif /* __KERNEL__ */
112
113#endif /* _ASM_X86_STRING_64_H */