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From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: linux-crypto@vger.kernel.org, herbert@gondor.apana.org.au
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: [PATCH v2 07/10] crypto: arm64/aes - avoid literals for cross-module symbol references
Date: Mon, 23 Jan 2017 14:05:23 +0000	[thread overview]
Message-ID: <1485180326-25612-8-git-send-email-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <1485180326-25612-1-git-send-email-ard.biesheuvel@linaro.org>

Using simple adrp/add pairs to refer to the AES lookup tables exposed by
the generic AES driver (which could be loaded far away from this driver
when KASLR is in effect) was unreliable at module load time before commit
41c066f2c4d4 ("arm64: assembler: make adr_l work in modules under KASLR"),
which is why the AES code used literals instead.

So now we can get rid of the literals, and switch to the adr_l macro.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 arch/arm64/crypto/aes-cipher-core.S | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/crypto/aes-cipher-core.S b/arch/arm64/crypto/aes-cipher-core.S
index 37590ab8121a..cd58c61e6677 100644
--- a/arch/arm64/crypto/aes-cipher-core.S
+++ b/arch/arm64/crypto/aes-cipher-core.S
@@ -89,8 +89,8 @@ CPU_BE(	rev		w8, w8		)
 	eor		w7, w7, w11
 	eor		w8, w8, w12
 
-	ldr		tt, =\ttab
-	ldr		lt, =\ltab
+	adr_l		tt, \ttab
+	adr_l		lt, \ltab
 
 	tbnz		rounds, #1, 1f
 
@@ -111,9 +111,6 @@ CPU_BE(	rev		w8, w8		)
 	stp		w5, w6, [out]
 	stp		w7, w8, [out, #8]
 	ret
-
-	.align		4
-	.ltorg
 	.endm
 
 	.align		5
-- 
2.7.4

  parent reply	other threads:[~2017-01-23 14:05 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-23 14:05 [PATCH v2 00/10] crypto - AES for ARM/arm64 updates for v4.11 (round #2) Ard Biesheuvel
2017-01-23 14:05 ` [PATCH v2 01/10] crypto: arm64/aes-neon-bs - honour iv_out requirement in CTR mode Ard Biesheuvel
2017-01-23 14:05 ` [PATCH v2 02/10] crypto: arm/aes-ce - remove cra_alignmask Ard Biesheuvel
2017-01-23 14:05 ` [PATCH v2 03/10] crypto: arm/chacha20 " Ard Biesheuvel
2017-01-23 14:05 ` [PATCH v2 04/10] crypto: arm64/aes-ce-ccm " Ard Biesheuvel
2017-01-23 14:05 ` [PATCH v2 05/10] crypto: arm64/aes-blk " Ard Biesheuvel
2017-01-23 14:05 ` [PATCH v2 06/10] crypto: arm64/chacha20 " Ard Biesheuvel
2017-01-23 14:05 ` Ard Biesheuvel [this message]
2017-01-23 14:05 ` [PATCH v2 08/10] crypto: arm64/aes - performance tweak Ard Biesheuvel
2017-01-23 14:05 ` [PATCH v2 09/10] crypto: arm64/aes-neon-blk - tweak performance for low end cores Ard Biesheuvel
2017-01-23 14:05 ` [PATCH v2 10/10] crypto: arm64/aes - replace scalar fallback with plain NEON fallback Ard Biesheuvel

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