[PATCH v2] crypto: arm64/poly1305 - move data to rodata section

From: Jia He
Date: Tue Aug 06 2024 - 01:55:26 EST


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.

There is a limit on how far the label can be from the instruction, hence
use "adrp" and low 12bits offset of the label to avoid the compilation
error.

Signed-off-by: Jia He <justin.he@xxxxxxx>
---
v2:
- use adrp+offset to avoid compilation error(kernel test bot and Andy)
v1: https://lkml.org/lkml/2024/8/2/616

arch/arm64/crypto/poly1305-armv8.pl | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/crypto/poly1305-armv8.pl b/arch/arm64/crypto/poly1305-armv8.pl
index cbc980fb02e3..22c9069c0650 100644
--- a/arch/arm64/crypto/poly1305-armv8.pl
+++ b/arch/arm64/crypto/poly1305-armv8.pl
@@ -473,7 +473,8 @@ poly1305_blocks_neon:
subs $len,$len,#64
ldp x9,x13,[$inp,#48]
add $in2,$inp,#96
- adr $zeros,.Lzeros
+ adrp $zeros,.Lzeros
+ add $zeros,$zeros,#:lo12:.Lzeros

lsl $padbit,$padbit,#24
add x15,$ctx,#48
@@ -885,10 +886,13 @@ 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