1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_STRING_64_H
3 #define _ASM_X86_STRING_64_H
6 #include <linux/jump_label.h>
8 /* Written 2002 by Andi Kleen */
10 /* Even with __builtin_ the compiler may decide to use the out of line
13 #if defined(__SANITIZE_MEMORY__) && defined(__NO_FORTIFY)
14 #include <linux/kmsan_string.h>
17 #define __HAVE_ARCH_MEMCPY 1
18 #if defined(__SANITIZE_MEMORY__) && defined(__NO_FORTIFY)
20 #define memcpy __msan_memcpy
22 extern void *memcpy(void *to, const void *from, size_t len);
24 extern void *__memcpy(void *to, const void *from, size_t len);
26 #define __HAVE_ARCH_MEMSET
27 #if defined(__SANITIZE_MEMORY__) && defined(__NO_FORTIFY)
28 extern void *__msan_memset(void *s, int c, size_t n);
30 #define memset __msan_memset
32 void *memset(void *s, int c, size_t n);
34 void *__memset(void *s, int c, size_t n);
36 #define __HAVE_ARCH_MEMSET16
37 static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
40 asm volatile("rep\n\t"
42 : "=&c" (d0), "=&D" (d1)
43 : "a" (v), "1" (s), "0" (n)
48 #define __HAVE_ARCH_MEMSET32
49 static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
52 asm volatile("rep\n\t"
54 : "=&c" (d0), "=&D" (d1)
55 : "a" (v), "1" (s), "0" (n)
60 #define __HAVE_ARCH_MEMSET64
61 static inline void *memset64(uint64_t *s, uint64_t v, size_t n)
64 asm volatile("rep\n\t"
66 : "=&c" (d0), "=&D" (d1)
67 : "a" (v), "1" (s), "0" (n)
72 #define __HAVE_ARCH_MEMMOVE
73 #if defined(__SANITIZE_MEMORY__) && defined(__NO_FORTIFY)
75 void *__msan_memmove(void *dest, const void *src, size_t len);
76 #define memmove __msan_memmove
78 void *memmove(void *dest, const void *src, size_t count);
80 void *__memmove(void *dest, const void *src, size_t count);
82 int memcmp(const void *cs, const void *ct, size_t count);
83 size_t strlen(const char *s);
84 char *strcpy(char *dest, const char *src);
85 char *strcat(char *dest, const char *src);
86 int strcmp(const char *cs, const char *ct);
88 #if (defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__))
90 * For files that not instrumented (e.g. mm/slub.c) we
91 * should use not instrumented version of mem* functions.
95 #define memcpy(dst, src, len) __memcpy(dst, src, len)
97 #define memmove(dst, src, len) __memmove(dst, src, len)
99 #define memset(s, c, n) __memset(s, c, n)
102 #define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
107 #ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
108 #define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
109 void __memcpy_flushcache(void *dst, const void *src, size_t cnt);
110 static __always_inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
112 if (__builtin_constant_p(cnt)) {
115 asm ("movntil %1, %0" : "=m"(*(u32 *)dst) : "r"(*(u32 *)src));
118 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
121 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
122 asm ("movntiq %1, %0" : "=m"(*(u64 *)(dst + 8)) : "r"(*(u64 *)(src + 8)));
126 __memcpy_flushcache(dst, src, cnt);
130 #endif /* __KERNEL__ */
132 #endif /* _ASM_X86_STRING_64_H */