From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S935868AbdEVVOt (ORCPT <rfc822;w@1wt.eu>);
        Mon, 22 May 2017 17:14:49 -0400
Received: from terminus.zytor.com ([65.50.211.136]:50223 "EHLO mail.zytor.com"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S933776AbdEVVOs (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 22 May 2017 17:14:48 -0400
Subject: Re: [PATCH 7/7] DWARF: add the config option
To: "H.J. Lu" <hjl.tools@gmail.com>, Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Jiri Slaby <jslaby@suse.cz>, Andrew Morton <akpm@linux-foundation.org>,
        live-patching@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        the arch/x86 maintainers <x86@kernel.org>,
        Jiri Kosina <jikos@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>
References: <20170505122200.31436-1-jslaby@suse.cz>
 <20170505122200.31436-7-jslaby@suse.cz>
 <CA+55aFzEF_A1MzH8P8EX35FSci7UFj_+5LdsEFVai1DYtCk-Hg@mail.gmail.com>
 <20170507165524.cdxfuwbd5alr7v6k@treble>
 <20170519205354.caeyqri2k6gvso3w@treble>
 <8dbbb971-fc41-fba2-f356-931a7eabe6ef@zytor.com>
 <20170519212913.otir6mlujoxoy3ha@treble>
 <20170519213556.pv5kxocfprfkloay@treble>
 <CALCETrWxwhKvm2jYG+d2xupd6uuEDAeBkafPonYNhxF6O=+qVA@mail.gmail.com>
 <20170520162034.fcciinh3nw5mvad5@treble>
 <CAMe9rOpHtXtcaPza8e2eU-aoeLfqhErV_23rPpM86YGnOWud4A@mail.gmail.com>
From: "H. Peter Anvin" <hpa@zytor.com>
Message-ID: <c7be1b3c-f4ad-ca89-4ad7-377be1dd0df9@zytor.com>
Date: Mon, 22 May 2017 14:07:56 -0700
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.1.0
MIME-Version: 1.0
In-Reply-To: <CAMe9rOpHtXtcaPza8e2eU-aoeLfqhErV_23rPpM86YGnOWud4A@mail.gmail.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 05/20/17 13:01, H.J. Lu wrote:
> On Sat, May 20, 2017 at 9:20 AM, Josh Poimboeuf <jpoimboe@redhat.com> wrote:
> 
>>>
>>> (H.J., could we get a binutils feature that allows is to do:
>>>
>>> pushq %whatever
>>> .cfi_adjust_sp -8
>>> ...
>>> popq %whatever
>>> .cfi_adjust_sp 8
>>>
> 
> Np.  Compiler needs to generate this.
> 

For actual assembly we have such a feature, it is called macros.

push/pop is the easy stuff; macros take care of that, but the real pain
is dealing with the flow of control.

	-hpa