diff mbox series

[RFC,v4,26/37] arm64: crypto: Remove unnecessary stackframe

Message ID 20220429094355.122389-27-chenzhongjin@huawei.com (mailing list archive)
State New, archived
Headers show
Series objtool: add base support for arm64 | expand

Commit Message

Chen Zhongjin April 29, 2022, 9:43 a.m. UTC 
From: Julien Thierry <jthierry@redhat.com>

The way sha256_block_neon restore the stackframe confuses objtool.
But it turns out this function is a leaf function and does not use
FP nor LR as scratch register.

Do not create a stackframe in this function as it is not necessary.

Signed-off-by: Julien Thierry <jthierry@redhat.com>
Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
---
 arch/arm64/crypto/sha512-armv8.pl | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/arch/arm64/crypto/sha512-armv8.pl b/arch/arm64/crypto/sha512-armv8.pl
index 35ec9ae99fe1..dca0f22df07f 100644
--- a/arch/arm64/crypto/sha512-armv8.pl
+++ b/arch/arm64/crypto/sha512-armv8.pl
@@ -644,8 +644,6 @@  $code.=<<___;
 .align	4
 sha256_block_neon:
 .Lneon_entry:
-	stp	x29, x30, [sp, #-16]!
-	mov	x29, sp
 	sub	sp,sp,#16*4
 
 	adr	$Ktbl,.LK256
@@ -732,8 +730,7 @@  $code.=<<___;
 	 mov	$Xfer,sp
 	b.ne	.L_00_48
 
-	ldr	x29,[x29]
-	add	sp,sp,#16*4+16
+	add	sp,sp,#16*4
 	ret
 .size	sha256_block_neon,.-sha256_block_neon
 ___