diff options
Diffstat (limited to 'src/arch/x86/memcpy.c')
| -rw-r--r-- | src/arch/x86/memcpy.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/src/arch/x86/memcpy.c b/src/arch/x86/memcpy.c index 93002cdd27..d96a93cd93 100644 --- a/src/arch/x86/memcpy.c +++ b/src/arch/x86/memcpy.c @@ -14,19 +14,26 @@ void *memcpy(void *dest, const void *src, size_t n) check_memory_region((unsigned long)dest, n, true, _RET_IP_); #endif - asm volatile( #if ENV_X86_64 - "rep ; movsd\n\t" + asm volatile( + "rep ; movsq\n\t" "mov %4,%%rcx\n\t" + "rep ; movsb\n\t" + : "=&c" (d0), "=&D" (d1), "=&S" (d2) + : "0" (n >> 3), "g" (n & 7), "1" (dest), "2" (src) + : "memory" + ); #else + asm volatile( "rep ; movsl\n\t" "movl %4,%%ecx\n\t" -#endif "rep ; movsb\n\t" : "=&c" (d0), "=&D" (d1), "=&S" (d2) : "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src) : "memory" ); +#endif + return dest; } |