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authorStefan Reinauer <stefan.reinauer@coreboot.org>2015-06-17 16:09:10 -0700
committerStefan Reinauer <stefan.reinauer@coreboot.org>2015-06-20 18:15:01 +0200
commit7c35af2bc3152cfc678561465f60884d56380632 (patch)
tree09ef7dad1711f8791e1eac48307d3b888ba4a9c9
parent7979dc09a84c653d507b776c0c2bbc1f06c570c5 (diff)
downloadcoreboot-7c35af2bc3152cfc678561465f60884d56380632.tar.xz
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 <stefan.reinauer@coreboot.org> Signed-off-by: Scott Duplichan <scott@notabs.org> Reviewed-on: http://review.coreboot.org/10575 Tested-by: build bot (Jenkins) Reviewed-by: Marc Jones <marc.jones@se-eng.com>
-rw-r--r--src/arch/x86/lib/memcpy.c5
1 files changed, 5 insertions, 0 deletions
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)