Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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);
31extern void *__memcpy(void *to, const void *from, size_t len);
32
33#ifndef CONFIG_KMEMCHECK
34#if (__GNUC__ == 4 && __GNUC_MINOR__ < 3) || __GNUC__ < 4
35#define memcpy(dst, src, len) \
36({ \
37 size_t __len = (len); \
38 void *__ret; \
39 if (__builtin_constant_p(len) && __len >= 64) \
40 __ret = __memcpy((dst), (src), __len); \
41 else \
42 __ret = __builtin_memcpy((dst), (src), __len); \
43 __ret; \
44})
45#endif
46#else
47/*
48 * kmemcheck becomes very happy if we use the REP instructions unconditionally,
49 * because it means that we know both memory operands in advance.
50 */
51#define memcpy(dst, src, len) __inline_memcpy((dst), (src), (len))
52#endif
53
54#define __HAVE_ARCH_MEMSET
55void *memset(void *s, int c, size_t n);
56void *__memset(void *s, int c, size_t n);
57
58#define __HAVE_ARCH_MEMMOVE
59void *memmove(void *dest, const void *src, size_t count);
60void *__memmove(void *dest, const void *src, size_t count);
61
62int memcmp(const void *cs, const void *ct, size_t count);
63size_t strlen(const char *s);
64char *strcpy(char *dest, const char *src);
65char *strcat(char *dest, const char *src);
66int strcmp(const char *cs, const char *ct);
67
68#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
69
70/*
71 * For files that not instrumented (e.g. mm/slub.c) we
72 * should use not instrumented version of mem* functions.
73 */
74
75#undef memcpy
76#define memcpy(dst, src, len) __memcpy(dst, src, len)
77#define memmove(dst, src, len) __memmove(dst, src, len)
78#define memset(s, c, n) __memset(s, c, n)
79#endif
80
81/**
82 * memcpy_mcsafe - copy memory with indication if a machine check happened
83 *
84 * @dst: destination address
85 * @src: source address
86 * @cnt: number of bytes to copy
87 *
88 * Low level memory copy function that catches machine checks
89 *
90 * Return 0 for success, -EFAULT for fail
91 */
92int memcpy_mcsafe(void *dst, const void *src, size_t cnt);
93
94#endif /* __KERNEL__ */
95
96#endif /* _ASM_X86_STRING_64_H */