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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,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 D3D04CA9ECF for ; Fri, 1 Nov 2019 22:13:29 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 A8D56217D9 for ; Fri, 1 Nov 2019 22:13:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="SA7+FlNM"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="q3YTCGLY" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A8D56217D9 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-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=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:To:From:Subject:References:Mime-Version :Message-Id:In-Reply-To:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=879X++7zCJOUkWXNHENJfK4q6zBXSaZyIp+jxoYX7mY=; b=SA7+FlNM9lkHc6 2+PPJsQGwZL74PaSTK4HhxUayg4IcqivRwsbQUf/8wgmsip3eKqzPYcUj/HMyGZCAW6Dvp4TctTr0 tNq5LFCEOEjx0R3UG5DoY74naa8GJelouxB86hpLfyxGT6faoSSq5V6iCM7+PqR02fydsJZZMLufZ zmqlmEmffFMKqqm0efgt3AFPITNAJZjaQBkrlLGAMJSqVvu9WsnS90JsWeb4ccVlWXDw+6FgH2+vh wXV8HuMktPI7jynmM26JlGra/XiDxk/MDP446KBNAoqB6rBrD+Yp5VrIhbMIH11ccdYNBp//pNjwX 9GRex8Pw5risbq0Ns81Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iQfAd-0000di-Ve; Fri, 01 Nov 2019 22:13:28 +0000 Received: from mail-pf1-x449.google.com ([2607:f8b0:4864:20::449]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iQf9K-0007lN-VA for linux-arm-kernel@lists.infradead.org; Fri, 01 Nov 2019 22:12:08 +0000 Received: by mail-pf1-x449.google.com with SMTP id a14so8440644pfr.12 for ; Fri, 01 Nov 2019 15:12:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=E806Ihq7Qr5kwAxZ8O8jq/5GK0i44oON304BuEfvZ08=; b=q3YTCGLY4SwiQs7Dr523GbwXcyS1rOF4ePlC+I2FlqMLdM1nbvtx89eitGKg3+MPv/ /6kpVC7ib3nqYGqEvd/D7Aja0/Oqw9bqK4yY73IHHngPbb8yNTF80TsjwS3dip4BNdjJ vrTCQU+wyHKRY1+9qAAoEBJOivxjjzkaOrEGQr3vnrSW+SARMhsCk1i/tL9jdyhbVr9G N6J/wBNQprJN4QGbaP/iQ1MEafD71JFawBswZkK6umVAzs2YdsoYpup5A4o/8Tk1dVfR JqWRLp00wfY2sTSArmHg6PdT5yupXzlZUV+YXQhkWVfHN9eXitDPORweXPhbmCnVSWKB z5cQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=E806Ihq7Qr5kwAxZ8O8jq/5GK0i44oON304BuEfvZ08=; b=RdfhlnpyiS08mX6DKfM4ETw12EyZFex7yisSY7nmmPoA58Uu+E/EG0SNTbtcTibxhm NwcRoUjGoi2IJSOLumU4tTevZBq7HFx88Q6B66yjww3N2Pc+97O2Mb2vmtrJkursokET vKgjgapqTgq2G1uFDRVIIUVqT953MZHKjQ8wwBJjjTifVEVW/swmsppHFb6TaFAZr400 0gzNVlnR4M1TJRDlriYGN9T/X9uf4bqrY8P+yQyB4zEMOuPDSKdNnylzxci5O5cliGiO DxflTzG+/8RQZb1WzBZVLeAB+XEVDBPgNWgmHvQZsm6gp1NKe3rIGG0aGQYAqtIzOBpl Q2yA== X-Gm-Message-State: APjAAAWctNoSmCfu5b7AK9K6dsaMshs/4+KgeMbhpS4vd+lmTLxd06hK 38/4ON8KlAZrq4LocAGynuSBZnGB+LWrEqhX6vA= X-Google-Smtp-Source: APXvYqyjCtIlE+FqIkDNQuZrIZu231KKDGdgU5VhgnFa05GlKuF5lFgoXY69KDCGAPVnM5k2sylcp3A3JeY4sKUC4Q0= X-Received: by 2002:a63:7015:: with SMTP id l21mr14741976pgc.200.1572646325115; Fri, 01 Nov 2019 15:12:05 -0700 (PDT) Date: Fri, 1 Nov 2019 15:11:37 -0700 In-Reply-To: <20191101221150.116536-1-samitolvanen@google.com> Message-Id: <20191101221150.116536-5-samitolvanen@google.com> Mime-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> <20191101221150.116536-1-samitolvanen@google.com> X-Mailer: git-send-email 2.24.0.rc1.363.gb1bccd3e3d-goog Subject: [PATCH v4 04/17] arm64: kernel: avoid x18 __cpu_soft_restart From: Sami Tolvanen To: Will Deacon , Catalin Marinas , Steven Rostedt , Masami Hiramatsu , Ard Biesheuvel X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191101_151207_026089_58E909F4 X-CRM114-Status: UNSURE ( 8.99 ) X-CRM114-Notice: Please train this message. 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: Mark Rutland , Kees Cook , Jann Horn , Masahiro Yamada , Marc Zyngier , kernel-hardening@lists.openwall.com, Nick Desaulniers , linux-kernel@vger.kernel.org, Miguel Ojeda , clang-built-linux@googlegroups.com, Sami Tolvanen , Laura Abbott , Dave Martin , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Ard Biesheuvel The code in __cpu_soft_restart() uses x18 as an arbitrary temp register, which will shortly be disallowed. So use x8 instead. Link: https://patchwork.kernel.org/patch/9836877/ Signed-off-by: Ard Biesheuvel [Sami: updated commit message] Signed-off-by: Sami Tolvanen Reviewed-by: Mark Rutland Reviewed-by: Kees Cook --- arch/arm64/kernel/cpu-reset.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/cpu-reset.S b/arch/arm64/kernel/cpu-reset.S index 6ea337d464c4..32c7bf858dd9 100644 --- a/arch/arm64/kernel/cpu-reset.S +++ b/arch/arm64/kernel/cpu-reset.S @@ -42,11 +42,11 @@ ENTRY(__cpu_soft_restart) mov x0, #HVC_SOFT_RESTART hvc #0 // no return -1: mov x18, x1 // entry +1: mov x8, x1 // entry mov x0, x2 // arg0 mov x1, x3 // arg1 mov x2, x4 // arg2 - br x18 + br x8 ENDPROC(__cpu_soft_restart) .popsection -- 2.24.0.rc1.363.gb1bccd3e3d-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel