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crypto: arm - use Kconfig based compiler checks for crypto opcodes

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Instead of allowing the Crypto Extensions algorithms to be selected when
using a toolchain that does not support them, and complain about it at
build time, use the information we have about the compiler to prevent
them from being selected in the first place. Users that are stuck with
a GCC version <4.8 are unlikely to care about these routines anyway, and
it cleans up the Makefile considerably.

While at it, add explicit 'armv8-a' CPU specifiers to the code that uses
the 'crypto-neon-fp-armv8' FPU specifier so we don't regress Clang, which
will complain about this in version 10 and later.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2019-10-11 11:08:00 +02:00 committed by Herbert Xu
parent 4549f7e5aa
commit b4d0c0aad5
7 changed files with 19 additions and 33 deletions
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14
arch/arm/crypto/Kconfig
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@ -30,7 +30,7 @@ config CRYPTO_SHA1_ARM_NEON
config CRYPTO_SHA1_ARM_CE
tristate "SHA1 digest algorithm (ARM v8 Crypto Extensions)"
depends on KERNEL_MODE_NEON
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
select CRYPTO_SHA1_ARM
select CRYPTO_HASH
help
@ -39,7 +39,7 @@ config CRYPTO_SHA1_ARM_CE
config CRYPTO_SHA2_ARM_CE
tristate "SHA-224/256 digest algorithm (ARM v8 Crypto Extensions)"
depends on KERNEL_MODE_NEON
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
select CRYPTO_SHA256_ARM
select CRYPTO_HASH
help
@ -96,7 +96,7 @@ config CRYPTO_AES_ARM_BS
config CRYPTO_AES_ARM_CE
tristate "Accelerated AES using ARMv8 Crypto Extensions"
depends on KERNEL_MODE_NEON
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
select CRYPTO_BLKCIPHER
select CRYPTO_SIMD
help
@ -105,7 +105,7 @@ config CRYPTO_AES_ARM_CE
config CRYPTO_GHASH_ARM_CE
tristate "PMULL-accelerated GHASH using NEON/ARMv8 Crypto Extensions"
depends on KERNEL_MODE_NEON
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
select CRYPTO_HASH
select CRYPTO_CRYPTD
select CRYPTO_GF128MUL
@ -117,12 +117,14 @@ config CRYPTO_GHASH_ARM_CE
config CRYPTO_CRCT10DIF_ARM_CE
tristate "CRCT10DIF digest algorithm using PMULL instructions"
depends on KERNEL_MODE_NEON && CRC_T10DIF
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
depends on CRC_T10DIF
select CRYPTO_HASH
config CRYPTO_CRC32_ARM_CE
tristate "CRC32(C) digest algorithm using CRC and/or PMULL instructions"
depends on KERNEL_MODE_NEON && CRC32
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
depends on CRC32
select CRYPTO_HASH
config CRYPTO_CHACHA20_NEON

32
arch/arm/crypto/Makefile
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@ -12,32 +12,12 @@ obj-$(CONFIG_CRYPTO_SHA512_ARM) += sha512-arm.o
obj-$(CONFIG_CRYPTO_CHACHA20_NEON) += chacha-neon.o
obj-$(CONFIG_CRYPTO_NHPOLY1305_NEON) += nhpoly1305-neon.o
ce-obj-$(CONFIG_CRYPTO_AES_ARM_CE) += aes-arm-ce.o
ce-obj-$(CONFIG_CRYPTO_SHA1_ARM_CE) += sha1-arm-ce.o
ce-obj-$(CONFIG_CRYPTO_SHA2_ARM_CE) += sha2-arm-ce.o
ce-obj-$(CONFIG_CRYPTO_GHASH_ARM_CE) += ghash-arm-ce.o
ce-obj-$(CONFIG_CRYPTO_CRCT10DIF_ARM_CE) += crct10dif-arm-ce.o
crc-obj-$(CONFIG_CRYPTO_CRC32_ARM_CE) += crc32-arm-ce.o
ifneq ($(crc-obj-y)$(crc-obj-m),)
ifeq ($(call as-instr,.arch armv8-a\n.arch_extension crc,y,n),y)
ce-obj-y += $(crc-obj-y)
ce-obj-m += $(crc-obj-m)
else
$(warning These CRC Extensions modules need binutils 2.23 or higher)
$(warning $(crc-obj-y) $(crc-obj-m))
endif
endif
ifneq ($(ce-obj-y)$(ce-obj-m),)
ifeq ($(call as-instr,.fpu crypto-neon-fp-armv8,y,n),y)
obj-y += $(ce-obj-y)
obj-m += $(ce-obj-m)
else
$(warning These ARMv8 Crypto Extensions modules need binutils 2.23 or higher)
$(warning $(ce-obj-y) $(ce-obj-m))
endif
endif
obj-$(CONFIG_CRYPTO_AES_ARM_CE) += aes-arm-ce.o
obj-$(CONFIG_CRYPTO_SHA1_ARM_CE) += sha1-arm-ce.o
obj-$(CONFIG_CRYPTO_SHA2_ARM_CE) += sha2-arm-ce.o
obj-$(CONFIG_CRYPTO_GHASH_ARM_CE) += ghash-arm-ce.o
obj-$(CONFIG_CRYPTO_CRCT10DIF_ARM_CE) += crct10dif-arm-ce.o
obj-$(CONFIG_CRYPTO_CRC32_ARM_CE) += crc32-arm-ce.o
aes-arm-y := aes-cipher-core.o aes-cipher-glue.o
aes-arm-bs-y := aes-neonbs-core.o aes-neonbs-glue.o

1
arch/arm/crypto/aes-ce-core.S
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@ -9,6 +9,7 @@
#include <asm/assembler.h>
.text
.arch armv8-a
.fpu crypto-neon-fp-armv8
.align 3

2
arch/arm/crypto/crct10dif-ce-core.S
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@ -72,7 +72,7 @@
#endif
.text
.arch armv7-a
.arch armv8-a
.fpu crypto-neon-fp-armv8
init_crc .req r0

1
arch/arm/crypto/ghash-ce-core.S
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@ -88,6 +88,7 @@
T3_H .req d17
.text
.arch armv8-a
.fpu crypto-neon-fp-armv8
.macro __pmull_p64, rd, rn, rm, b1, b2, b3, b4

1
arch/arm/crypto/sha1-ce-core.S
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@ -10,6 +10,7 @@
#include <asm/assembler.h>
.text
.arch armv8-a
.fpu crypto-neon-fp-armv8
k0 .req q0

1
arch/arm/crypto/sha2-ce-core.S
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@ -10,6 +10,7 @@
#include <asm/assembler.h>
.text
.arch armv8-a
.fpu crypto-neon-fp-armv8
k0 .req q7