From mboxrd@z Thu Jan 1 00:00:00 1970 From: Srinivas Ramana Subject: LDM/STM alignment fixups on arm64 Date: Wed, 19 Apr 2017 12:03:58 +0530 Message-ID: <58F704D6.6000301@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from smtp.codeaurora.org ([198.145.29.96]:60616 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760239AbdDSGeD (ORCPT ); Wed, 19 Apr 2017 02:34:03 -0400 Sender: linux-arm-msm-owner@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org To: "linux-arm-kernel@lists.infradead.org" , linux-arm-msm@vger.kernel.org Cc: will.deacon@arm.com, catalin.marinas@arm.com, neeraju@codeaurora.org Hi, While understanding how the alignment are handled on arm and arm64, we came across the fixups for LDM/LDRD/STM on arm where as these fixups are not present on arm64. There may be some specific reason why these fixups are not ported to arm64. Can you please help us understand this? With this difference in how kernel handles 32-bit apps on arm and arm64, there can be apps which are working without abort on arm, but fail on arm64 (SIGBUS). We have tried to get some history on web, but not successful. If this is indeed missing on arm64, do you see any issue if its ported (does it fail any guidance)? Thanks, -- Srinivas R -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.