1#ifndef _ASM_X86_STRING_64_H
2#define _ASM_X86_STRING_64_H
3
4#ifdef __KERNEL__
5
6/* Written 2002 by Andi Kleen */
7
8/* Only used for special circumstances. Stolen from i386/string.h */
9static __always_inline void *__inline_memcpy(void *to, const void *from, size_t n)
10{
11	unsigned long d0, d1, d2;
12	asm volatile("rep ; movsl\n\t"
13		     "testb $2,%b4\n\t"
14		     "je 1f\n\t"
15		     "movsw\n"
16		     "1:\ttestb $1,%b4\n\t"
17		     "je 2f\n\t"
18		     "movsb\n"
19		     "2:"
20		     : "=&c" (d0), "=&D" (d1), "=&S" (d2)
21		     : "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
22		     : "memory");
23	return to;
24}
25
26/* Even with __builtin_ the compiler may decide to use the out of line
27   function. */
28
29#define __HAVE_ARCH_MEMCPY 1
30extern void *__memcpy(void *to, const void *from, size_t len);
31
32#ifndef CONFIG_KMEMCHECK
33#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
34extern void *memcpy(void *to, const void *from, size_t len);
35#else
36#define memcpy(dst, src, len)					\
37({								\
38	size_t __len = (len);					\
39	void *__ret;						\
40	if (__builtin_constant_p(len) && __len >= 64)		\
41		__ret = __memcpy((dst), (src), __len);		\
42	else							\
43		__ret = __builtin_memcpy((dst), (src), __len);	\
44	__ret;							\
45})
46#endif
47#else
48/*
49 * kmemcheck becomes very happy if we use the REP instructions unconditionally,
50 * because it means that we know both memory operands in advance.
51 */
52#define memcpy(dst, src, len) __inline_memcpy((dst), (src), (len))
53#endif
54
55#define __HAVE_ARCH_MEMSET
56void *memset(void *s, int c, size_t n);
57void *__memset(void *s, int c, size_t n);
58
59#define __HAVE_ARCH_MEMMOVE
60void *memmove(void *dest, const void *src, size_t count);
61void *__memmove(void *dest, const void *src, size_t count);
62
63int memcmp(const void *cs, const void *ct, size_t count);
64size_t strlen(const char *s);
65char *strcpy(char *dest, const char *src);
66char *strcat(char *dest, const char *src);
67int strcmp(const char *cs, const char *ct);
68
69#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
70
71/*
72 * For files that not instrumented (e.g. mm/slub.c) we
73 * should use not instrumented version of mem* functions.
74 */
75
76#undef memcpy
77#define memcpy(dst, src, len) __memcpy(dst, src, len)
78#define memmove(dst, src, len) __memmove(dst, src, len)
79#define memset(s, c, n) __memset(s, c, n)
80#endif
81
82#endif /* __KERNEL__ */
83
84#endif /* _ASM_X86_STRING_64_H */
85