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 extern 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 55 void *memset(void *s, int c, size_t n); 56 void *__memset(void *s, int c, size_t n); 57 58 #define __HAVE_ARCH_MEMMOVE 59 void *memmove(void *dest, const void *src, size_t count); 60 void *__memmove(void *dest, const void *src, size_t count); 61 62 int memcmp(const void *cs, const void *ct, size_t count); 63 size_t strlen(const char *s); 64 char *strcpy(char *dest, const char *src); 65 char *strcat(char *dest, const char *src); 66 int 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 */ 92 int memcpy_mcsafe(void *dst, const void *src, size_t cnt); 93 94 #endif /* __KERNEL__ */ 95 96 #endif /* _ASM_X86_STRING_64_H */ 97