arm/crc32: expose CRC32 functions through lib

Move the arm CRC32 assembly code into the lib directory and wire it up
to the library interface.  This allows it to be used without going
through the crypto API.  It remains usable via the crypto API too via
the shash algorithms that use the library interface.  Thus all the
arch-specific "shash" code becomes unnecessary and is removed.

Note: to see the diff from arch/arm/crypto/crc32-ce-glue.c to
arch/arm/lib/crc32-glue.c, view this commit with 'git show -M10'.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20241202010844.144356-6-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>

arch/arm/Kconfig

@@ -7,6 +7,7 @@ config ARM
 	select ARCH_HAS_BINFMT_FLAT
 	select ARCH_HAS_CPU_CACHE_ALIASING
 	select ARCH_HAS_CPU_FINALIZE_INIT if MMU
+	select ARCH_HAS_CRC32 if KERNEL_MODE_NEON
 	select ARCH_HAS_CURRENT_STACK_POINTER
 	select ARCH_HAS_DEBUG_VIRTUAL if MMU
 	select ARCH_HAS_DMA_ALLOC if MMU

arch/arm/configs/milbeaut_m10v_defconfig

@@ -107,7 +107,6 @@ CONFIG_CRYPTO_AES_ARM=m
 CONFIG_CRYPTO_AES_ARM_BS=m
 CONFIG_CRYPTO_AES_ARM_CE=m
 CONFIG_CRYPTO_CHACHA20_NEON=m
-CONFIG_CRYPTO_CRC32_ARM_CE=m
 # CONFIG_CRYPTO_HW is not set
 CONFIG_CRC_CCITT=m
 CONFIG_CRC_ITU_T=m

arch/arm/configs/multi_v7_defconfig

@@ -1306,7 +1306,6 @@ CONFIG_CRYPTO_AES_ARM=m
 CONFIG_CRYPTO_AES_ARM_BS=m
 CONFIG_CRYPTO_AES_ARM_CE=m
 CONFIG_CRYPTO_CHACHA20_NEON=m
-CONFIG_CRYPTO_CRC32_ARM_CE=m
 CONFIG_CRYPTO_DEV_SUN4I_SS=m
 CONFIG_CRYPTO_DEV_FSL_CAAM=m
 CONFIG_CRYPTO_DEV_EXYNOS_RNG=m

arch/arm/crypto/Kconfig

@@ -222,20 +222,6 @@ config CRYPTO_CHACHA20_NEON
 	  Architecture: arm using:
 	  - NEON (Advanced SIMD) extensions
 
-config CRYPTO_CRC32_ARM_CE
-	tristate "CRC32C and CRC32"
-	depends on KERNEL_MODE_NEON
-	depends on CRC32
-	select CRYPTO_HASH
-	help
-	  CRC32c CRC algorithm with the iSCSI polynomial (RFC 3385 and RFC 3720)
-	  and CRC32 CRC algorithm (IEEE 802.3)
-
-	  Architecture: arm using:
-	  - CRC and/or PMULL instructions
-
-	  Drivers: crc32-arm-ce and crc32c-arm-ce
-
 config CRYPTO_CRCT10DIF_ARM_CE
 	tristate "CRCT10DIF"
 	depends on KERNEL_MODE_NEON

arch/arm/crypto/Makefile

@@ -21,7 +21,6 @@ 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
@@ -38,7 +37,6 @@ sha2-arm-ce-y	:= sha2-ce-core.o sha2-ce-glue.o
 aes-arm-ce-y	:= aes-ce-core.o aes-ce-glue.o
 ghash-arm-ce-y	:= ghash-ce-core.o ghash-ce-glue.o
 crct10dif-arm-ce-y	:= crct10dif-ce-core.o crct10dif-ce-glue.o
-crc32-arm-ce-y:= crc32-ce-core.o crc32-ce-glue.o
 chacha-neon-y := chacha-scalar-core.o chacha-glue.o
 chacha-neon-$(CONFIG_KERNEL_MODE_NEON) += chacha-neon-core.o
 poly1305-arm-y := poly1305-core.o poly1305-glue.o

arch/arm/lib/Makefile

@@ -45,3 +45,6 @@ ifeq ($(CONFIG_KERNEL_MODE_NEON),y)
 endif
 
 obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
+
+obj-$(CONFIG_CRC32_ARCH) += crc32-arm.o
+crc32-arm-y := crc32-glue.o crc32-core.o

arch/arm/crypto/crc32-ce-core.S → arch/arm/lib/crc32-core.S

@@ -48,7 +48,6 @@
  */
 
 #include <linux/linkage.h>
-#include <linux/cfi_types.h>
 #include <asm/assembler.h>
 
 	.text
@@ -297,11 +296,11 @@ ARM_BE8(rev16		r3, r3		)
 	.endm
 
 	.align		5
-SYM_TYPED_FUNC_START(crc32_armv8_le)
+SYM_FUNC_START(crc32_armv8_le)
 	__crc32
 SYM_FUNC_END(crc32_armv8_le)
 
 	.align		5
-SYM_TYPED_FUNC_START(crc32c_armv8_le)
+SYM_FUNC_START(crc32c_armv8_le)
 	__crc32		c
 SYM_FUNC_END(crc32c_armv8_le)