include/asm-x86_64/string.h

   1 #ifndef _X86_64_STRING_H_
   2 #define _X86_64_STRING_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 inline void * __inline_memcpy(void * to, const void * from, size_t n)
  10 {
  11 unsigned long d0, d1, d2;
  12 __asm__ __volatile__(
  13         "rep ; movsl\n\t"
  14         "testb $2,%b4\n\t"
  15         "je 1f\n\t"
  16         "movsw\n"
  17         "1:\ttestb $1,%b4\n\t"
  18         "je 2f\n\t"
  19         "movsb\n"
  20         "2:"
  21         : "=&c" (d0), "=&D" (d1), "=&S" (d2)
  22         :"0" (n/4), "q" (n),"1" ((long) to),"2" ((long) from)
  23         : "memory");
  24 return (to);
  25 }
  26
  27 /* Even with __builtin_ the compiler may decide to use the out of line
  28    function. */
  29
  30 #define __HAVE_ARCH_MEMCPY 1
  31 extern void *__memcpy(void *to, const void *from, size_t len);
  32 #define memcpy(dst,src,len) \
  33         ({ size_t __len = (len);                                \
  34            void *__ret;                                         \
  35            if (__builtin_constant_p(len) && __len >= 64)        \
  36                  __ret = __memcpy((dst),(src),__len);           \
  37            else                                                 \
  38                  __ret = __builtin_memcpy((dst),(src),__len);   \
  39            __ret; })
  40
  41
  42 #define __HAVE_ARCH_MEMSET
  43 #define memset __builtin_memset
  44
  45 #define __HAVE_ARCH_MEMMOVE
  46 void * memmove(void * dest,const void *src,size_t count);
  47
  48 /* Use C out of line version for memcmp */
  49 #define memcmp __builtin_memcmp
  50 int memcmp(const void * cs,const void * ct,size_t count);
  51
  52 /* out of line string functions use always C versions */
  53 #define strlen __builtin_strlen
  54 size_t strlen(const char * s);
  55
  56 #define strcpy __builtin_strcpy
  57 char * strcpy(char * dest,const char *src);
  58
  59 #define strcat __builtin_strcat
  60 char * strcat(char * dest, const char * src);
  61
  62 #define strcmp __builtin_strcmp
  63 int strcmp(const char * cs,const char * ct);
  64
  65 #endif /* __KERNEL__ */
  66
  67 #endif