linux-kernel - [PATCH] crypto: arm64/poly1305

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Message-Id: <20240715072023.61032-1-justin.he@arm.com>
Date: Mon, 15 Jul 2024 07:20:23 +0000
From: Jia He <justin.he@....com>
To: Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-crypto@...r.kernel.org
Cc: Will Deacon <will@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Jia He <justin.he@....com>
Subject: [PATCH] crypto: arm64/poly1305 - move data to rodata section

When objtool gains support for ARM in the future, it may encounter issues
disassembling the following data in the .text section: 
> .Lzeros:
> .long   0,0,0,0,0,0,0,0
> .asciz  "Poly1305 for ARMv8, CRYPTOGAMS by \@dot-asm"
> .align  2

Move it to .rodata which is a more appropriate section for read-only data.

Signed-off-by: Jia He <justin.he@....com>
---
Inspired by commit 1253cab8a352, although currently objtool hasn't been
supported on Arm, we should do some preparation(this patch) firstly.

 arch/arm64/crypto/poly1305-armv8.pl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/crypto/poly1305-armv8.pl b/arch/arm64/crypto/poly1305-armv8.pl
index cbc980fb02e3..bcb70c9541e9 100644
--- a/arch/arm64/crypto/poly1305-armv8.pl
+++ b/arch/arm64/crypto/poly1305-armv8.pl
@@ -885,10 +885,13 @@ poly1305_blocks_neon:
 	ret
 .size	poly1305_blocks_neon,.-poly1305_blocks_neon
 
+.pushsection .rodata
 .align	5
 .Lzeros:
 .long	0,0,0,0,0,0,0,0
 .asciz	"Poly1305 for ARMv8, CRYPTOGAMS by \@dot-asm"
+.popsection
+
 .align	2
 #if !defined(__KERNEL__) && !defined(_WIN64)
 .comm	OPENSSL_armcap_P,4,4
-- 
2.34.1