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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id EDDC1C6FD1F for ; Fri, 22 Mar 2024 00:10:03 +0000 (UTC) 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:In-Reply-To:MIME-Version:References: 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=7/J7/A1rMX4K6j/llV077OJ481PCbPSZfRrHyl8ZoF0=; b=mqiP0+7xt66oOk kDPM3hu+dLHNoY9wx1VP6in6qDZeIOhlffuGUEKRv0pAbymE+Z+c55/KXVDyZ3mbnt16R4dKqa12o eHob9TmnmMpu5lt4P4yzR7FVMiygRGyD5eHSNjpIp99BNHvHdiXhUnlJ8n93ax468kJCcmaqyE94H hn9yuYuTsvBq3jDinlF1d1FF1WML24vnlq+ioglXFoI7EIlBWCeG9HIBcROzABaJTJ6pZ+Fqt0exP DCXAl1mh9FicNeO0Ev96++5Retq2HmtHCbrodHubEOQuoKYBvBwJat23n6MgfYzIIdVtGXX9yyv7o dVcAhJMllWdPBiyewMGg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rnSTp-00000005DAO-3EGi; Fri, 22 Mar 2024 00:09:53 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rnSTi-00000005D4F-21Y8 for linux-arm-kernel@lists.infradead.org; Fri, 22 Mar 2024 00:09:51 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=2moEpAismjcawN+PGW1bmLh6TrJn1P653kp5rgnCLkg=; b=aXkMMI0ja+5UEUhZLzxrAJrkpo OggZC2nCb+f2Fc6/hgyq/dQ94GWFA01LJDDP2/qY/PfR0cOEEIRO7rDEZOR4X/evTYWr484x/xhO3 47CbPRUUvktN9l7IXCMsnWhcklfjWOYuw0E9d92IWt5TWXUCJkQDKh03JS9U77CcNYcMHVghXmFFu 2t4mOBimVFjY+Dib9ePoRuVpnTqqQ61NKl5z1snJ7I9je9VFA/RF6dHv7EuRNfac5ZN52xWm/ySPu Nb6YpH4MMb2hjDYG5OrQtutMpquZ7gmQOTxdeOUBXqEoAoqtZcYcCC66Uvr72DpXZJUlgnF69G1wf Ybls5MUA==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:44658) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1rnST0-0008AS-2e; Fri, 22 Mar 2024 00:09:02 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1rnSSs-00049Z-Vr; Fri, 22 Mar 2024 00:08:55 +0000 Date: Fri, 22 Mar 2024 00:08:54 +0000 From: "Russell King (Oracle)" To: Ard Biesheuvel Cc: David Laight , Jiangfeng Xiao , "arnd@arndb.de" , "keescook@chromium.org" , "haibo.li@mediatek.com" , "angelogioacchino.delregno@collabora.com" , "amergnat@baylibre.com" , "akpm@linux-foundation.org" , "dave.hansen@linux.intel.com" , "douzhaolei@huawei.com" , "gustavoars@kernel.org" , "jpoimboe@kernel.org" , "kepler.chenxin@huawei.com" , "kirill.shutemov@linux.intel.com" , "linux-hardening@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "linux-arm-kernel@lists.infradead.org" , "nixiaoming@huawei.com" , "peterz@infradead.org" , "wangbing6@huawei.com" , "wangfangpeng1@huawei.com" , "jannh@google.com" , "willy@infradead.org" Subject: Re: [PATCH v2] ARM: unwind: improve unwinders for noreturn case Message-ID: References: <1709516385-7778-1-git-send-email-xiaojiangfeng@huawei.com> <1710906278-23851-1-git-send-email-xiaojiangfeng@huawei.com> <84a57ca8-8963-ca24-8bd1-ddc5c33bf4da@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240321_170946_557665_4C47E65E X-CRM114-Status: UNSURE ( 9.97 ) X-CRM114-Notice: Please train this message. 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, Mar 21, 2024 at 11:43:41PM +0100, Ard Biesheuvel wrote: > Given that this particular issue would just disappear if the compiler > would just insert a BRK after the BL, I'd prefer to explore first > whether we can get this fixed on the compiler side. Arm32 doesn't have a BRK instruction. What would be appropriate after the no-return BL would be OS specific. Maybe a branch to "abort" would be a good idea though. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel