src/arch/x86/memcpy.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <string.h>
   4 #include <stdbool.h>
   5 #include <asan.h>
   6
   7 void *memcpy(void *dest, const void *src, size_t n)
   8 {
   9         unsigned long d0, d1, d2;
  10
  11 #if (ENV_SEPARATE_ROMSTAGE && CONFIG(ASAN_IN_ROMSTAGE)) || \
  12                 (ENV_RAMSTAGE && CONFIG(ASAN_IN_RAMSTAGE))
  13         check_memory_region((unsigned long)src, n, false, _RET_IP_);
  14         check_memory_region((unsigned long)dest, n, true, _RET_IP_);
  15 #endif
  16
  17 #if ENV_X86_64
  18         asm volatile(
  19                 "rep ; movsq\n\t"
  20                 "mov %4,%%rcx\n\t"
  21                 "rep ; movsb\n\t"
  22                 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
  23                 : "0" (n >> 3), "g" (n & 7), "1" (dest), "2" (src)
  24                 : "memory"
  25         );
  26 #else
  27         asm volatile(
  28                 "rep ; movsl\n\t"
  29                 "movl %4,%%ecx\n\t"
  30                 "rep ; movsb\n\t"
  31                 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
  32                 : "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
  33                 : "memory"
  34         );
  35 #endif
  36
  37
  38         return dest;
  39 }