arm64: use xzr to zero-out the bss section
AArch64 has a zero register (xzr). Use it instead of x2.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
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 @@
*/
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