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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>
This commit is contained in:
Masahiro Yamada 2017-01-27 16:15:29 +09:00 committed by Tom Rini
parent 446d4e048e
commit b913c3f079
1 changed files with 1 additions and 2 deletions
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3
arch/arm/lib/crt0_64.S
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@ -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