blob: 1f22bc277c455a2181551e5d304b80d0cf8d1c8f [file] [log] [blame]
#ifndef _ASM_X86_STRING_64_H
#define _ASM_X86_STRING_64_H
#ifdef __KERNEL__
#include <linux/jump_label.h>
/* Written 2002 by Andi Kleen */
/* Only used for special circumstances. Stolen from i386/string.h */
static __always_inline void *__inline_memcpy(void *to, const void *from, size_t n)
unsigned long d0, d1, d2;
asm volatile("rep ; movsl\n\t"
"testb $2,%b4\n\t"
"je 1f\n\t"
"1:\ttestb $1,%b4\n\t"
"je 2f\n\t"
: "=&c" (d0), "=&D" (d1), "=&S" (d2)
: "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
: "memory");
return to;
/* Even with __builtin_ the compiler may decide to use the out of line
function. */
#define __HAVE_ARCH_MEMCPY 1
extern void *memcpy(void *to, const void *from, size_t len);
extern void *__memcpy(void *to, const void *from, size_t len);
#if (__GNUC__ == 4 && __GNUC_MINOR__ < 3) || __GNUC__ < 4
#define memcpy(dst, src, len) \
({ \
size_t __len = (len); \
void *__ret; \
if (__builtin_constant_p(len) && __len >= 64) \
__ret = __memcpy((dst), (src), __len); \
else \
__ret = __builtin_memcpy((dst), (src), __len); \
__ret; \
* kmemcheck becomes very happy if we use the REP instructions unconditionally,
* because it means that we know both memory operands in advance.
#define memcpy(dst, src, len) __inline_memcpy((dst), (src), (len))
void *memset(void *s, int c, size_t n);
void *__memset(void *s, int c, size_t n);
void *memmove(void *dest, const void *src, size_t count);
void *__memmove(void *dest, const void *src, size_t count);
int memcmp(const void *cs, const void *ct, size_t count);
size_t strlen(const char *s);
char *strcpy(char *dest, const char *src);
char *strcat(char *dest, const char *src);
int strcmp(const char *cs, const char *ct);
#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
* For files that not instrumented (e.g. mm/slub.c) we
* should use not instrumented version of mem* functions.
#undef memcpy
#define memcpy(dst, src, len) __memcpy(dst, src, len)
#define memmove(dst, src, len) __memmove(dst, src, len)
#define memset(s, c, n) __memset(s, c, n)
__must_check int memcpy_mcsafe_unrolled(void *dst, const void *src, size_t cnt);
* memcpy_mcsafe - copy memory with indication if a machine check happened
* @dst: destination address
* @src: source address
* @cnt: number of bytes to copy
* Low level memory copy function that catches machine checks
* We only call into the "safe" function on systems that can
* actually do machine check recovery. Everyone else can just
* use memcpy().
* Return 0 for success, -EFAULT for fail
static __always_inline __must_check int
memcpy_mcsafe(void *dst, const void *src, size_t cnt)
#ifdef CONFIG_X86_MCE
if (static_branch_unlikely(&mcsafe_key))
return memcpy_mcsafe_unrolled(dst, src, cnt);
memcpy(dst, src, cnt);
return 0;
void memcpy_flushcache(void *dst, const void *src, size_t cnt);
#endif /* __KERNEL__ */
#endif /* _ASM_X86_STRING_64_H */