From patchwork Thu Sep 18 21:43:12 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Boyd X-Patchwork-Id: 4934001 Return-Path: X-Original-To: patchwork-linux-arm-msm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 86CB09F32F for ; Thu, 18 Sep 2014 21:43:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9577120173 for ; Thu, 18 Sep 2014 21:44:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BE54B20138 for ; Thu, 18 Sep 2014 21:44:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757466AbaIRVnq (ORCPT ); Thu, 18 Sep 2014 17:43:46 -0400 Received: from smtp.codeaurora.org ([198.145.11.231]:36127 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755464AbaIRVnR (ORCPT ); Thu, 18 Sep 2014 17:43:17 -0400 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 5BB4613FD8D; Thu, 18 Sep 2014 21:43:17 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 486) id 4F34813FD92; Thu, 18 Sep 2014 21:43:17 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from sboyd-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: sboyd@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id B6A4A13FD8D; Thu, 18 Sep 2014 21:43:16 +0000 (UTC) From: Stephen Boyd To: linux-arm-kernel@lists.infradead.org Cc: Stepan Moskovchenko , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Will Deacon Subject: [PATCH 3/3] arm: vfp: Bounce undefined instructions in vectored mode Date: Thu, 18 Sep 2014 14:43:12 -0700 Message-Id: <1411076592-6157-4-git-send-email-sboyd@codeaurora.org> X-Mailer: git-send-email 2.1.0.61.ge50deb1 In-Reply-To: <1411076592-6157-1-git-send-email-sboyd@codeaurora.org> References: <1411076592-6157-1-git-send-email-sboyd@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Stepan Moskovchenko Certain ARM CPU implementations (e.g. Cortex-A15) may not raise a floating- point exception whenever deprecated short-vector VFP instructions are executed. Instead these instructions are treated as UNALLOCATED. Change the VFP exception handling code to emulate short-vector instructions even if FPEXC exception bits are not set. Tested-by: Will Deacon Signed-off-by: Stepan Moskovchenko Signed-off-by: Stephen Boyd --- arch/arm/vfp/vfphw.S | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S index be807625ed8c..c041579a8d82 100644 --- a/arch/arm/vfp/vfphw.S +++ b/arch/arm/vfp/vfphw.S @@ -197,6 +197,12 @@ look_for_VFP_exceptions: tst r5, #FPSCR_IXE bne process_exception + tst r5, #FPSCR_LENGTH_MASK + beq skip + orr r1, r1, #FPEXC_DEX + b process_exception +skip: + @ Fall into hand on to next handler - appropriate coproc instr @ not recognised by VFP