xref: /openbmc/linux/arch/x86/include/asm/string_64.h (revision e2f1cf25)
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 */
9 static __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
30 extern void *__memcpy(void *to, const void *from, size_t len);
31 
32 #ifndef CONFIG_KMEMCHECK
33 #if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
34 extern 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
56 void *memset(void *s, int c, size_t n);
57 void *__memset(void *s, int c, size_t n);
58 
59 #define __HAVE_ARCH_MEMMOVE
60 void *memmove(void *dest, const void *src, size_t count);
61 void *__memmove(void *dest, const void *src, size_t count);
62 
63 int memcmp(const void *cs, const void *ct, size_t count);
64 size_t strlen(const char *s);
65 char *strcpy(char *dest, const char *src);
66 char *strcat(char *dest, const char *src);
67 int 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