crypto: x86/sha256-ni - convert to use rounds macros

To avoid source code duplication, do the SHA-256 rounds using macros.
This reduces the length of sha256_ni_asm.S by 153 lines while still
producing the exact same object file.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 29 insertions, 182 deletions

diff --git a/arch/x86/crypto/sha256_ni_asm.S b/arch/x86/crypto/sha256_ni_asm.S
index 537b6dcd7ed8..498f67727b94 100644
--- a/arch/x86/crypto/sha256_ni_asm.S
+++ b/arch/x86/crypto/sha256_ni_asm.S
@@ -76,6 +76,29 @@
 #define ABEF_SAVE	%xmm9
 #define CDGH_SAVE	%xmm10
 
+.macro do_4rounds	i, m0, m1, m2, m3
+.if \i < 16
+	movdqu		\i*4(DATA_PTR), MSG
+	pshufb		SHUF_MASK, MSG
+	movdqa		MSG, \m0
+.else
+	movdqa		\m0, MSG
+.endif
+	paddd		\i*4(SHA256CONSTANTS), MSG
+	sha256rnds2	STATE0, STATE1
+.if \i >= 12 && \i < 60
+	movdqa		\m0, MSGTMP4
+	palignr		$4, \m3, MSGTMP4
+	paddd		MSGTMP4, \m1
+	sha256msg2	\m0, \m1
+.endif
+	pshufd 		$0x0E, MSG, MSG
+	sha256rnds2	STATE1, STATE0
+.if \i >= 4 && \i < 52
+	sha256msg1	\m0, \m3
+.endif
+.endm
+
 /*
  * Intel SHA Extensions optimized implementation of a SHA-256 update function
  *
@@ -86,9 +109,6 @@
  * store partial blocks.  All message padding and hash value initialization must
  * be done outside the update function.
  *
- * The indented lines in the loop are instructions related to rounds processing.
- * The non-indented lines are instructions related to the message schedule.
- *
  * void sha256_ni_transform(uint32_t *digest, const void *data,
 		uint32_t numBlocks);
  * digest : pointer to digest
@@ -125,185 +145,12 @@ SYM_TYPED_FUNC_START(sha256_ni_transform)
 	movdqa		STATE0, ABEF_SAVE
 	movdqa		STATE1, CDGH_SAVE
 
-	/* Rounds 0-3 */
-	movdqu		0*16(DATA_PTR), MSG
-	pshufb		SHUF_MASK, MSG
-	movdqa		MSG, MSGTMP0
-		paddd		0*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-
-	/* Rounds 4-7 */
-	movdqu		1*16(DATA_PTR), MSG
-	pshufb		SHUF_MASK, MSG
-	movdqa		MSG, MSGTMP1
-		paddd		1*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP1, MSGTMP0
-
-	/* Rounds 8-11 */
-	movdqu		2*16(DATA_PTR), MSG
-	pshufb		SHUF_MASK, MSG
-	movdqa		MSG, MSGTMP2
-		paddd		2*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP2, MSGTMP1
-
-	/* Rounds 12-15 */
-	movdqu		3*16(DATA_PTR), MSG
-	pshufb		SHUF_MASK, MSG
-	movdqa		MSG, MSGTMP3
-		paddd		3*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP3, MSGTMP4
-	palignr		$4, MSGTMP2, MSGTMP4
-	paddd		MSGTMP4, MSGTMP0
-	sha256msg2	MSGTMP3, MSGTMP0
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP3, MSGTMP2
-
-	/* Rounds 16-19 */
-	movdqa		MSGTMP0, MSG
-		paddd		4*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP0, MSGTMP4
-	palignr		$4, MSGTMP3, MSGTMP4
-	paddd		MSGTMP4, MSGTMP1
-	sha256msg2	MSGTMP0, MSGTMP1
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP0, MSGTMP3
-
-	/* Rounds 20-23 */
-	movdqa		MSGTMP1, MSG
-		paddd		5*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP1, MSGTMP4
-	palignr		$4, MSGTMP0, MSGTMP4
-	paddd		MSGTMP4, MSGTMP2
-	sha256msg2	MSGTMP1, MSGTMP2
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP1, MSGTMP0
-
-	/* Rounds 24-27 */
-	movdqa		MSGTMP2, MSG
-		paddd		6*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP2, MSGTMP4
-	palignr		$4, MSGTMP1, MSGTMP4
-	paddd		MSGTMP4, MSGTMP3
-	sha256msg2	MSGTMP2, MSGTMP3
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP2, MSGTMP1
-
-	/* Rounds 28-31 */
-	movdqa		MSGTMP3, MSG
-		paddd		7*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP3, MSGTMP4
-	palignr		$4, MSGTMP2, MSGTMP4
-	paddd		MSGTMP4, MSGTMP0
-	sha256msg2	MSGTMP3, MSGTMP0
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP3, MSGTMP2
-
-	/* Rounds 32-35 */
-	movdqa		MSGTMP0, MSG
-		paddd		8*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP0, MSGTMP4
-	palignr		$4, MSGTMP3, MSGTMP4
-	paddd		MSGTMP4, MSGTMP1
-	sha256msg2	MSGTMP0, MSGTMP1
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP0, MSGTMP3
-
-	/* Rounds 36-39 */
-	movdqa		MSGTMP1, MSG
-		paddd		9*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP1, MSGTMP4
-	palignr		$4, MSGTMP0, MSGTMP4
-	paddd		MSGTMP4, MSGTMP2
-	sha256msg2	MSGTMP1, MSGTMP2
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP1, MSGTMP0
-
-	/* Rounds 40-43 */
-	movdqa		MSGTMP2, MSG
-		paddd		10*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP2, MSGTMP4
-	palignr		$4, MSGTMP1, MSGTMP4
-	paddd		MSGTMP4, MSGTMP3
-	sha256msg2	MSGTMP2, MSGTMP3
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP2, MSGTMP1
-
-	/* Rounds 44-47 */
-	movdqa		MSGTMP3, MSG
-		paddd		11*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP3, MSGTMP4
-	palignr		$4, MSGTMP2, MSGTMP4
-	paddd		MSGTMP4, MSGTMP0
-	sha256msg2	MSGTMP3, MSGTMP0
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP3, MSGTMP2
-
-	/* Rounds 48-51 */
-	movdqa		MSGTMP0, MSG
-		paddd		12*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP0, MSGTMP4
-	palignr		$4, MSGTMP3, MSGTMP4
-	paddd		MSGTMP4, MSGTMP1
-	sha256msg2	MSGTMP0, MSGTMP1
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-	sha256msg1	MSGTMP0, MSGTMP3
-
-	/* Rounds 52-55 */
-	movdqa		MSGTMP1, MSG
-		paddd		13*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP1, MSGTMP4
-	palignr		$4, MSGTMP0, MSGTMP4
-	paddd		MSGTMP4, MSGTMP2
-	sha256msg2	MSGTMP1, MSGTMP2
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-
-	/* Rounds 56-59 */
-	movdqa		MSGTMP2, MSG
-		paddd		14*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-	movdqa		MSGTMP2, MSGTMP4
-	palignr		$4, MSGTMP1, MSGTMP4
-	paddd		MSGTMP4, MSGTMP3
-	sha256msg2	MSGTMP2, MSGTMP3
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
-
-	/* Rounds 60-63 */
-	movdqa		MSGTMP3, MSG
-		paddd		15*16(SHA256CONSTANTS), MSG
-		sha256rnds2	STATE0, STATE1
-		pshufd 		$0x0E, MSG, MSG
-		sha256rnds2	STATE1, STATE0
+.irp i, 0, 16, 32, 48
+	do_4rounds	(\i + 0),  MSGTMP0, MSGTMP1, MSGTMP2, MSGTMP3
+	do_4rounds	(\i + 4),  MSGTMP1, MSGTMP2, MSGTMP3, MSGTMP0
+	do_4rounds	(\i + 8),  MSGTMP2, MSGTMP3, MSGTMP0, MSGTMP1
+	do_4rounds	(\i + 12), MSGTMP3, MSGTMP0, MSGTMP1, MSGTMP2
+.endr
 
 	/* Add current hash values with previously saved */
 	paddd		ABEF_SAVE, STATE0