arch/x86/lib/memmove_64.c

   1 /* Normally compiler builtins are used, but sometimes the compiler calls out
   2    of line code. Based on asm-i386/string.h.
   3  */
   4 #define _STRING_C
   5 #include <linux/string.h>
   6 #include <linux/module.h>
   7
   8 #undef memmove
   9 void *memmove(void *dest, const void *src, size_t count)
  10 {
  11         if (dest < src) {
  12                 return memcpy(dest, src, count);
  13         } else {
  14                 char *p = dest + count;
  15                 const char *s = src + count;
  16                 while (count--)
  17                         *--p = *--s;
  18         }
  19         return dest;
  20 }
  21 EXPORT_SYMBOL(memmove);