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#if (defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__))
89/*
90 * For files that not instrumented (e.g. mm/slub.c) we
91 * should use not instrumented version of mem* functions.
92 */
93
94#undef memcpy
95#define memcpy(dst, src, len) __memcpy(dst, src, len)
96#undef memmove
97#define memmove(dst, src, len) __memmove(dst, src, len)
98#undef memset
99#define memset(s, c, n) __memset(s, c, n)
100
101#ifndef __NO_FORTIFY
102#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
103#endif
104
105#endif
106
107#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
108#define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
109void __memcpy_flushcache(void *dst, const void *src, size_t cnt);
110static __always_inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
111{
112 if (__builtin_constant_p(cnt)) {
113 switch (cnt) {
114 case 4:
115 asm ("movntil %1, %0" : "=m"(*(u32 *)dst) : "r"(*(u32 *)src));
116 return;
117 case 8:
118 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
119 return;
120 case 16:
121 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
122 asm ("movntiq %1, %0" : "=m"(*(u64 *)(dst + 8)) : "r"(*(u64 *)(src + 8)));
123 return;
124 }
125 }
126 __memcpy_flushcache(dst, src, cnt);
127}
128#endif
129
130#endif /* __KERNEL__ */
131
132#endif /* _ASM_X86_STRING_64_H */