From patchwork Fri Apr 9 22:11:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 12195133 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-24.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C45B3C433ED for ; Fri, 9 Apr 2021 22:12:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6C69E611AD for ; Fri, 9 Apr 2021 22:12:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234902AbhDIWMb (ORCPT ); Fri, 9 Apr 2021 18:12:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:53520 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234602AbhDIWMb (ORCPT ); Fri, 9 Apr 2021 18:12:31 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E0ABB610A8; Fri, 9 Apr 2021 22:12:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618006337; bh=M7s3pMhdWn3yHEsyevVbXdjmmUWWkdETqRhmlxr/BlU=; h=From:To:Cc:Subject:Date:From; b=u8y2wdd5u/QpjQy7m0Mnv9ezCsy+6q+xfW8jgXnagVFBq5MniZ9a9DTrDCRolQoo5 oI8lvsMs7amktN21+2FJzdF5kbvYLuyYfKXdXKpkfZJVvc0XLX8gaaZK8xAmVYkJy3 hwhOCQiTO6ZUpg6y+Ez9Fo9qD99ihYlmbCxBQYZxdyPhFAkD/2+tIVtfk1KauI7h2w 0rboiSLYcZLBBIycx9UZ/c0QVsBjiUZaTO5xRE4Yw8B/FN15qzo1ANrs8sjPHNhP+g NByXHDb9V0M3wOtvCHGVDXveeFDKPd9SQtCY55QGJCzx34J2b9hkYiGoVFz99dS7wL TY8gT0uhpgaqQ== From: Nathan Chancellor To: Herbert Xu , "David S. Miller" Cc: Russell King , Nick Desaulniers , Ard Biesheuvel , "Jason A. Donenfeld" , linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Nathan Chancellor , stable@vger.kernel.org, Arnd Bergmann , Jessica Clarke Subject: [PATCH] crypto: arm/curve25519 - Move '.fpu' after '.arch' Date: Fri, 9 Apr 2021 15:11:55 -0700 Message-Id: <20210409221155.1113205-1-nathan@kernel.org> X-Mailer: git-send-email 2.31.1.189.g2e36527f23 MIME-Version: 1.0 X-Patchwork-Bot: notify Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Debian's clang carries a patch that makes the default FPU mode 'vfp3-d16' instead of 'neon' for 'armv7-a' to avoid generating NEON instructions on hardware that does not support them: https://salsa.debian.org/pkg-llvm-team/llvm-toolchain/-/raw/5a61ca6f21b4ad8c6ac4970e5ea5a7b5b4486d22/debian/patches/clang-arm-default-vfp3-on-armv7a.patch https://bugs.debian.org/841474 https://bugs.debian.org/842142 https://bugs.debian.org/914268 This results in the following build error when clang's integrated assembler is used because the '.arch' directive overrides the '.fpu' directive: arch/arm/crypto/curve25519-core.S:25:2: error: instruction requires: NEON vmov.i32 q0, #1 ^ arch/arm/crypto/curve25519-core.S:26:2: error: instruction requires: NEON vshr.u64 q1, q0, #7 ^ arch/arm/crypto/curve25519-core.S:27:2: error: instruction requires: NEON vshr.u64 q0, q0, #8 ^ arch/arm/crypto/curve25519-core.S:28:2: error: instruction requires: NEON vmov.i32 d4, #19 ^ Shuffle the order of the '.arch' and '.fpu' directives so that the code builds regardless of the default FPU mode. This has been tested against both clang with and without Debian's patch and GCC. Cc: stable@vger.kernel.org Fixes: d8f1308a025f ("crypto: arm/curve25519 - wire up NEON implementation") Link: https://github.com/ClangBuiltLinux/continuous-integration2/issues/118 Reported-by: Arnd Bergmann Suggested-by: Arnd Bergmann Suggested-by: Jessica Clarke Signed-off-by: Nathan Chancellor Acked-by: Jason A. Donenfeld Reviewed-by: Nick Desaulniers Tested-by: Nick Desaulniers --- arch/arm/crypto/curve25519-core.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) base-commit: e49d033bddf5b565044e2abe4241353959bc9120 diff --git a/arch/arm/crypto/curve25519-core.S b/arch/arm/crypto/curve25519-core.S index be18af52e7dc..b697fa5d059a 100644 --- a/arch/arm/crypto/curve25519-core.S +++ b/arch/arm/crypto/curve25519-core.S @@ -10,8 +10,8 @@ #include .text -.fpu neon .arch armv7-a +.fpu neon .align 4 ENTRY(curve25519_neon)