LXR linux/arch/x86/include/asm/string

   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 */
  97