Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 */