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=-17.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 47CCECA9EA9 for ; Fri, 18 Oct 2019 16:11:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1FC52222C5 for ; Fri, 18 Oct 2019 16:11:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="TZOVdcpB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2442946AbfJRQLA (ORCPT ); Fri, 18 Oct 2019 12:11:00 -0400 Received: from mail-pl1-f201.google.com ([209.85.214.201]:41358 "EHLO mail-pl1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2442937AbfJRQK7 (ORCPT ); Fri, 18 Oct 2019 12:10:59 -0400 Received: by mail-pl1-f201.google.com with SMTP id b10so4032543pls.8 for ; Fri, 18 Oct 2019 09:10:59 -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=SzRVhVCQSEs4UpxvfljRvYSxQu5VFVx82TZExeQC7I8=; b=TZOVdcpBJiow5T4VOPKVfmYmovhUmd2ZBG9xflMRKW8S5BQ2L7yu5g6JY0/TCCHH+I XufZXerCCZfchS8x9jnvOoLMze/QWKGKm/0eGk215XJdEA1kME5jv8jnjb92Pb1eVWkw yiTgUjP8Rao1lkPZ3wsgn20YfPu5vdw09AcOGQOKuwSW35OqEXFlPzTQhP7pZvaCNMAW MWtaplAUSr+50SFN34KRGzFF9OlQtJcKYXSWZanQMwKs4H+DZ9A3MX4sVyK4cRYJFJ+w rlR21WxyyCXlD1Tc/Mn6bTnrGGsiH8nauEVx60lyfrl/C39gDgUhzHfYMSQ6uZ9ljLwO QH/g== 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=SzRVhVCQSEs4UpxvfljRvYSxQu5VFVx82TZExeQC7I8=; b=R3Qxzdx0DRgYjw7UYw8BRDlmWDBUZc0Hvb95sh9dyDRH/M9iBeMvPUECWOdmNqJM5J UpkIRTa92koufrNqfyjCURLoyGeyT6BL6hAEvxxPH3shBdtjrpZH7DK3Zm86dLUV2IPF UBEEj/diZoeYUsOiAMVFYdhIVO05vtq6lNiMuw6WdKuVXL3/q1asoIGPqajGoM8KUguB GzIi2bou0RJLjkiEozIwlujGrXwtFHb6BDghFYv7MP+KPUou8SOo8lXuzKo6W8gmJBfK gnmGz7rt+/B67q3D9SjHxI7+1+WtcZ7xqW9qOzhaE8qF4Fn70SkWO8VbJ9uf9HeMjbEc P/Og== X-Gm-Message-State: APjAAAWhLq/P86jLJOjEw/fPS5kWZtXQ3nfUZ2OwP0Ej2VOXMRE5U+9M pRptgrE1Oa0ewt/B/C9VDpuDirbTLg8Ldn/Ey8c= X-Google-Smtp-Source: APXvYqymenYk+Nj4KHMBe+/txGcAk8emmf58ZAJAVtmISgexrXgZK+srN7qpXD3xJ732mL5rywUz419mv8CrbkTon24= X-Received: by 2002:a65:68c2:: with SMTP id k2mr10843389pgt.241.1571415058696; Fri, 18 Oct 2019 09:10:58 -0700 (PDT) Date: Fri, 18 Oct 2019 09:10:19 -0700 In-Reply-To: <20191018161033.261971-1-samitolvanen@google.com> Message-Id: <20191018161033.261971-5-samitolvanen@google.com> Mime-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> X-Mailer: git-send-email 2.23.0.866.gb869b98d4c-goog Subject: [PATCH 04/18] arm64: kernel: avoid x18 as an arbitrary temp register From: Sami Tolvanen To: Will Deacon , Catalin Marinas , Steven Rostedt , Ard Biesheuvel Cc: Dave Martin , Kees Cook , Laura Abbott , Mark Rutland , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.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 Signed-off-by: Sami Tolvanen --- 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 -- 2.23.0.866.gb869b98d4c-goog