linux-kernel - Re: [PATCH 7/7] DWARF: add the config option

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Message-ID: <c7be1b3c-f4ad-ca89-4ad7-377be1dd0df9@zytor.com>
Date:   Mon, 22 May 2017 14:07:56 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     "H.J. Lu" <hjl.tools@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        live-patching@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 7/7] DWARF: add the config option

On 05/20/17 13:01, H.J. Lu wrote:
> On Sat, May 20, 2017 at 9:20 AM, Josh Poimboeuf <jpoimboe@...hat.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