From 7c35af2bc3152cfc678561465f60884d56380632 Mon Sep 17 00:00:00 2001 From: Stefan Reinauer Date: Wed, 17 Jun 2015 16:09:10 -0700 Subject: [PATCH] x86: make memcpy 64bit safe This does not optimize memcpy for 64bit, it merely makes it compile. Change-Id: I69ad6bd0c3d5f617d9222643abf7a2ba7c2a0359 Signed-off-by: Stefan Reinauer Signed-off-by: Scott Duplichan Reviewed-on: http://review.coreboot.org/10575 Tested-by: build bot (Jenkins) Reviewed-by: Marc Jones --- src/arch/x86/lib/memcpy.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/arch/x86/lib/memcpy.c b/src/arch/x86/lib/memcpy.c index 7f079ce9d6..4915a9eb51 100644 --- a/src/arch/x86/lib/memcpy.c +++ b/src/arch/x86/lib/memcpy.c @@ -5,8 +5,13 @@ void *memcpy(void *dest, const void *src, size_t n) unsigned long d0, d1, d2; asm volatile( +#ifdef __x86_64__ + "rep ; movsd\n\t" + "mov %4,%%rcx\n\t" +#else "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)