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lib/crypto: arm64/sha512-ce: Drop compatibility macros for older binutils

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Now that the oldest supported binutils version is 2.30, the macros that
emit the SHA-512 instructions as '.inst' words are no longer needed.  So
drop them.  No change in the generated machine code.

Changed from the original patch by Ard Biesheuvel:
(https://lore.kernel.org/r/20250515142702.2592942-2-ardb+git@google.com):
 - Reduced scope to just SHA-512
 - Added comment that explains why "sha3" is used instead of "sha2"

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250718220706.475240-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers
2025-07-18 15:07:06 -07:00
parent 42e3376e09
commit debc1e5a43
1 changed files with 11 additions and 20 deletions
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31
lib/crypto/arm64/sha512-ce-core.S
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@@ -12,26 +12,17 @@
#include <linux/linkage.h>
#include <asm/assembler.h>
.irp b,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19
.set .Lq\b, \b
.set .Lv\b\().2d, \b
.endr
.macro sha512h, rd, rn, rm
.inst 0xce608000 | .L\rd | (.L\rn << 5) | (.L\rm << 16)
.endm
.macro sha512h2, rd, rn, rm
.inst 0xce608400 | .L\rd | (.L\rn << 5) | (.L\rm << 16)
.endm
.macro sha512su0, rd, rn
.inst 0xcec08000 | .L\rd | (.L\rn << 5)
.endm
.macro sha512su1, rd, rn, rm
.inst 0xce608800 | .L\rd | (.L\rn << 5) | (.L\rm << 16)
.endm
/*
* We have to specify the "sha3" feature here, since the GNU and clang
* assemblers both consider the SHA-512 instructions to be part of the
* "sha3" feature. (Except binutils 2.30 through 2.42, which used
* "sha2". But "sha3" implies "sha2", so "sha3" still works in those
* versions.) "sha3" doesn't make a lot of sense, since SHA-512 is part
* of the SHA-2 family of algorithms, and also the Arm Architecture
* Reference Manual defines FEAT_SHA512 and FEAT_SHA3 separately.
* Regardless, we must use "sha3" to be compatible with the assemblers.
*/
.arch armv8-a+sha3
/*
* The SHA-512 round constants