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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 BC66CC433F5 for ; Wed, 23 Feb 2022 15:30:50 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4K3g3X6NYlz3cPC for ; Thu, 24 Feb 2022 02:30:48 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.crashing.org (client-ip=63.228.1.57; helo=gate.crashing.org; envelope-from=segher@kernel.crashing.org; receiver=) Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) by lists.ozlabs.org (Postfix) with ESMTP id 4K3g351Hlxz2yMx for ; Thu, 24 Feb 2022 02:30:24 +1100 (AEDT) Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id 21NFRJFj001983; Wed, 23 Feb 2022 09:27:19 -0600 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id 21NFRJU4001982; Wed, 23 Feb 2022 09:27:19 -0600 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Wed, 23 Feb 2022 09:27:19 -0600 From: Segher Boessenkool To: Anders Roxell Subject: Re: [PATCH 3/3] powerpc: lib: sstep: fix build errors Message-ID: <20220223152719.GF614@gate.crashing.org> References: <20220223135820.2252470-1-anders.roxell@linaro.org> <20220223135820.2252470-3-anders.roxell@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220223135820.2252470-3-anders.roxell@linaro.org> User-Agent: Mutt/1.4.2.3i X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: stable@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Arnd Bergmann Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Wed, Feb 23, 2022 at 02:58:20PM +0100, Anders Roxell wrote: > Building tinyconfig with gcc (Debian 11.2.0-16) and assembler (Debian > 2.37.90.20220207) the following build error shows up: > > {standard input}: Assembler messages: > {standard input}:10576: Error: unrecognized opcode: `stbcx.' > {standard input}:10680: Error: unrecognized opcode: `lharx' > {standard input}:10694: Error: unrecognized opcode: `lbarx' > > Rework to add assembler directives [1] around the instruction. The > problem with this might be that we can trick a power6 into > single-stepping through an stbcx. for instance, and it will execute that > in kernel mode. > > [1] https://sourceware.org/binutils/docs/as/PowerPC_002dPseudo.html#PowerPC_002dPseudo Wow, no wonder you think you need quotes after reading that. I'll try to get that fixed. Reviewed-by: Segher Boessenkool Segher