From mboxrd@z Thu Jan 1 00:00:00 1970 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=-15.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 44DAEC43461 for ; Thu, 17 Sep 2020 07:50:19 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E2DE321973 for ; Thu, 17 Sep 2020 07:50:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="MlDL2fG4"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="vOBv8tax" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E2DE321973 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=BeU/LQNGocXVTDpCHsa1o3dcHWTNeVL4VtpHspihOgo=; b=MlDL2fG4+OCJ2MTk5TDU+skdH nY6PHB6VXubf+1ngom+BYJ9FqD4gFfFvemy+UKXknS/nJJS0+sdKZtSF1CmKTe3GtUSDi8URthADR PxYWfzjfYTMOT8BcHDEdtBLZiVxNkYD3e8NS0jNN80dGfVr8GooOwYBUCZXm4jWZ8ArOJBhBC4RGg Bnjej53wNLwGPzRdLBnRQT6uX/vABiOz7pRW7VJV/0OBZTq1ejLRVyBN3kEYlIavXO/qZRYf5Bos5 S7W81e9YsA+KAVkfiWQ3qsNEPydBucPPCW9aRyT4zMqVGLacGl6WbttrjU0hVnEC/5woYB0MsKEDE /6KRgy1eQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kIof1-0000hx-6d; Thu, 17 Sep 2020 07:48:55 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kIoeh-0000aa-Ae for linux-arm-kernel@merlin.infradead.org; Thu, 17 Sep 2020 07:48:35 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=FWSWdjkt7SDTdU0fRV8XsXQQqviseOrbspWhwRmZ8GI=; b=vOBv8taxWre55z7SD5btqt4Zuv rS3fzD4SNpNFoLaDo9NZgElHM/uW7PuKA7uE9DiKjaCZLieV63NoHtF8WgTAUCZYEe9hzLkJbkI9A 6nHbzOysPMH1TGyHtXTWUayvQWO4zQLTZbi4G6dQ/ZavUcaDIvhltFFMCbczifd0tX3fuVpB2J8Ul 7PcSJPKiTqrL/5gsDwJ5ZKXE7FHi3RnxTJwh6G98+Hedce7g9dc5BgsSUIGE/zpEfxSOYIs23PVOP NP49YaECTPLH8tLRdXMyOW/M0BGpcDnbZkew/w56d3EzpVxtfPTPf9L22eJV+nEqmizFrniQpIS1+ nMMzY1Cw==; Received: from 089144214092.atnat0023.highway.a1.net ([89.144.214.92] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kIoeg-0006k7-0q; Thu, 17 Sep 2020 07:48:34 +0000 From: Christoph Hellwig To: x86@kernel.org, Jan Kara Subject: [PATCH 2/3] compat: add a compat_need_64bit_alignment_fixup() helper Date: Thu, 17 Sep 2020 09:41:58 +0200 Message-Id: <20200917074159.2442167-3-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200917074159.2442167-1-hch@lst.de> References: <20200917074159.2442167-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a helper to check if the calling syscall needs a fixup for non-natural 64-bit type alignment in the compat ABI. This will only return true for i386 syscalls on x86_64. Signed-off-by: Christoph Hellwig --- arch/x86/include/asm/compat.h | 1 + include/linux/compat.h | 9 +++++++++ 2 files changed, 10 insertions(+) diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h index bf547701f41f87..0e327a01f50fbb 100644 --- a/arch/x86/include/asm/compat.h +++ b/arch/x86/include/asm/compat.h @@ -209,6 +209,7 @@ static inline bool in_compat_syscall(void) return in_32bit_syscall(); } #define in_compat_syscall in_compat_syscall /* override the generic impl */ +#define compat_need_64bit_alignment_fixup in_ia32_syscall #endif struct compat_siginfo; diff --git a/include/linux/compat.h b/include/linux/compat.h index b354ce58966e2d..fd10c3a692c2cc 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -932,6 +932,15 @@ static inline bool in_compat_syscall(void) { return false; } #endif /* CONFIG_COMPAT */ +/* + * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit + * types, and will need special compat treatment for that. Most architectures + * don't need that special handling even for compat syscalls. + */ +#ifndef compat_need_64bit_alignment_fixup +#define compat_need_64bit_alignment_fixup() false +#endif + /* * A pointer passed in from user mode. This should not * be used for syscall parameters, just declare them -- 2.28.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel