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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 394EDC433F5 for ; Fri, 15 Oct 2021 00:19:58 +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 ECFD76108E for ; Fri, 15 Oct 2021 00:19:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org ECFD76108E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Mime-Version:References:In-Reply-To: Message-Id:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=aDQz6pygRNz9vGSRTE0tg9j5D4LGGNfAYVACzVnIe2U=; b=zV/KGhmbM/l8ze JcwlLizN1T73ZVE6kxFROJuhnKajcgjeJzXv9uU05nj7T2lSlH8qnAHtKrzfE3QPQL2e9fZAPzEux m21RkHHPaL6W2UunILgRypX0EpunxYD19LJhy3MqeVafSPoyub7NAjwfp1Ot+XdNE/Hte+AXh45cA hvX6v2Y6kJlycXOEc+KvoXxrnjD+a0BXoYDfc9QJAOdecMFuu/0EpMSw3eyuHPGotfC3ncFKlRe96 EeTEE9VSu+Rky+3XJi24ruQHRqQX1gd2UCxBH1SgnXt3X9Q5QLYgqM1GpBaO7UIoAoMMlcA6DaD4S BVWo+jsgOKWPz6CG/dMg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mbAvm-004kuE-R9; Fri, 15 Oct 2021 00:18:38 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mbAvj-004ktn-Rp for linux-arm-kernel@lists.infradead.org; Fri, 15 Oct 2021 00:18:37 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id C825C6108E; Fri, 15 Oct 2021 00:18:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1634257115; bh=Z3UOu6jr8cU0ilKr740bQYqd9+n2GwanZcjiupK2hcw=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=TIVeO1aC2FcrKNIr/3WL8ZR085bRXEFNNCodVeZm3H47FdkJCsjdBpv3dDXnjZ9Wv Z3ByY6m1HSgPc3NTszZ7nLLI3eeRlWvQcX8irs5hb3xzRTk20rvAlu0YwE8MzmFcJm yeFFAbJrwVP4tGHVjya0ykDVYMnl/RuYu7cPtiyi87YVr82eQhDk1sv6qQKiFrDrFY dRz8o5RsERQS3ZHt66YbYRwS/nDBhA3wChRnDnijVMgdnxzbqsOWoO0HnkJ4JFgqWs xpQFMwkd36g+M75Z/VTkWrFt2b+XJFOMZbnTSb4dX97kqSTNMDN4eQm1iOz9cdKrly +DbcA9Gl2A0vw== Date: Fri, 15 Oct 2021 09:18:32 +0900 From: Masami Hiramatsu To: "Russell King (Oracle)" Cc: Steven Rostedt , "Naveen N . Rao" , Ananth N Mavinakayanahalli , Ingo Molnar , linux-kernel@vger.kernel.org, Sven Schnelle , Catalin Marinas , Will Deacon , Nathan Chancellor , Nick Desaulniers , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 6/8] ARM: clang: Do not relay on lr register for stacktrace Message-Id: <20211015091832.3e114751496041931f214bab@kernel.org> In-Reply-To: References: <163369609308.636038.15295764725220907794.stgit@devnote2> <163369614818.636038.5019945597127474028.stgit@devnote2> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) Mime-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211014_171835_955704_2F0CB81B X-CRM114-Status: GOOD ( 16.40 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 On Thu, 14 Oct 2021 17:53:24 +0100 "Russell King (Oracle)" wrote: > On Fri, Oct 08, 2021 at 09:29:08PM +0900, Masami Hiramatsu wrote: > > Currently the stacktrace on clang compiled arm kernel uses the 'lr' > > register to find the first frame address from pt_regs. However, that > > is wrong after calling another function, because the 'lr' register > > is used by 'bl' instruction and never be recovered. > > > > As same as gcc arm kernel, directly use the frame pointer (x11) of > > the pt_regs to find the first frame address. > > Can I ask that the subject line is corrected. It's "rely" not "relay". Oops, yes, that's my typo. Thanks for correcting! > > Also, the frame pointer is called "r11" not "x11" if you want to use > the numerical register reference for 32-bit ARM registers. Oh, I mixed up the register name between arm64 and ARM... Thank you, > > Thanks. > > -- > RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ > FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! -- Masami Hiramatsu _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel