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 42C11C54EE9 for ; Wed, 14 Sep 2022 00:13:03 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4MS14s2Fksz3bkx for ; Wed, 14 Sep 2022 10:13:01 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=AeeDYlyn; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=2604:1380:4601:e00::1; helo=ams.source.kernel.org; envelope-from=jpoimboe@kernel.org; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=AeeDYlyn; dkim-atps=neutral Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4MS14B6qWSz2xH8 for ; Wed, 14 Sep 2022 10:12:26 +1000 (AEST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id A8163B81196; Wed, 14 Sep 2022 00:12:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 647DEC433D6; Wed, 14 Sep 2022 00:12:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1663114342; bh=PkSh2//wMMp1MucFJs9CmlOv4o1oTLiq6JeiANe5BEo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=AeeDYlynyt1LJBaJ00Iv8XZJT10JWjMT0mMUqrTKdFOuLS6T/Q+8fpljbd1GOBeaM svEGoLsrMaa0ItXAYwG0HoHZwQ7vSF6x5IzXZrpvqEuL7knNH7XINDQov0BAn42rd0 BSqGyhaU7mwqMx7slEz1YhuLCGA5XCpyfFzzkERDDIbTmX7CeojbnJna9/sFXzg4vX tw09jGuizzgFnYcTuWVnb1jpaOVYWBQZWowJbVldBmU6Kd0qTbeTRQw3YKPS9SX8Rh 7qcnz0bxNiF9EpzRaINR/0rVnn3ph7Lvuk6h5wZumNm6w85W4RaEWu4NpWL9nwUhTO 3dcW/kYdRPmFw== Date: Wed, 14 Sep 2022 01:12:05 +0100 From: Josh Poimboeuf To: Indu Bhagat Subject: Re: [RFC] Objtool toolchain proposal: -fannotate-{jump-table,noreturn} Message-ID: <20220914001205.ygvmwya5wcawcodj@treble> References: <20220909180704.jwwed4zhwvin7uyi@treble> <9f01a8b9-9ec6-6759-ba14-ee529a5b973a@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <9f01a8b9-9ec6-6759-ba14-ee529a5b973a@oracle.com> 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: Mark Rutland , Peter Zijlstra , linuxppc-dev@lists.ozlabs.org, Chen Zhongjin , x86@kernel.org, Nick Desaulniers , linux-kernel@vger.kernel.org, Mark Brown , Sathvika Vasireddy , linux-toolchains@vger.kernel.org, live-patching@vger.kernel.org, Miroslav Benes , Will Deacon , Ard Biesheuvel , linux-arm-kernel@lists.infradead.org, "Jose E. Marchesi" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, Sep 13, 2022 at 03:51:44PM -0700, Indu Bhagat wrote: > Curious to know what all features of objtool rely on the need to reverse > engineer the control flow graph. Is it a larger set or it is only for ORC > generation ? Objtool features which rely on the CFG: - Frame pointer rule validation (when using CONFIG_UNWINDER_FRAME_POINTER) - ORC metadata generation - Intel SMAP rule validation - ensures EFLAGS #AC is only set during usercopy - "noinstr" rule validation - ensures no instrumentation/tracing functions are called in certain critical sections -- Josh