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#ifndef _ASM_X86_STRING_64_H #define _ASM_X86_STRING_64_H #ifdef __KERNEL__ /* 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" "movsw\n" "1:\ttestb $1,%b4\n\t" "je 2f\n\t" "movsb\n" "2:" : "=&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); #ifndef CONFIG_KMEMCHECK #if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4 extern void *memcpy(void *to, const void *from, size_t len); #else #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; \ }) #endif #else /* * 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)) #endif #define __HAVE_ARCH_MEMSET void *memset(void *s, int c, size_t n); void *__memset(void *s, int c, size_t n); #define __HAVE_ARCH_MEMMOVE 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) #endif #endif /* __KERNEL__ */ #endif /* _ASM_X86_STRING_64_H */
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