[U-Boot] [PATCH 1/2] arm64: use xzr to zero-out the bss section

[Masahiro Yamada]

AArch64 has a zero register (xzr).  Use it instead of x2.

Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
---

 arch/arm/lib/crt0_64.S | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm/lib/crt0_64.S b/arch/arm/lib/crt0_64.S
index 91b19e0..f8e84b2 100644
--- a/arch/arm/lib/crt0_64.S
+++ b/arch/arm/lib/crt0_64.S
@@ -117,9 +117,8 @@ relocation_return:
  */
 	ldr	x0, =__bss_start		/* this is auto-relocated! */
 	ldr	x1, =__bss_end			/* this is auto-relocated! */
-	mov	x2, #0
 clear_loop:
-	str	x2, [x0]
+	str	xzr, [x0]
 	add	x0, x0, #8
 	cmp	x0, x1
 	b.lo	clear_loop
-- 
2.7.4