diff options
Diffstat (limited to 'payloads/libpayload/arch/x86/string.c')
| -rw-r--r-- | payloads/libpayload/arch/x86/string.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/payloads/libpayload/arch/x86/string.c b/payloads/libpayload/arch/x86/string.c index 836d049831..11bcae7acb 100644 --- a/payloads/libpayload/arch/x86/string.c +++ b/payloads/libpayload/arch/x86/string.c @@ -81,6 +81,16 @@ void *memcpy(void *dest, const void *src, size_t n) { unsigned long d0, d1, d2; +#if CONFIG(LP_ARCH_X86_64) + 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" @@ -89,6 +99,7 @@ void *memcpy(void *dest, const void *src, size_t n) : "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src) : "memory" ); +#endif return dest; } |