linux-kernel - Re: [PATCH 2/3] objtool: check: Support addition to set CFA base

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Message-ID: <20200918210927.eh2tilurtuhc6q4a@treble>
Date:   Fri, 18 Sep 2020 16:09:27 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Julien Thierry <jthierry@...hat.com>
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org, mbenes@...e.cz,
        raphael.gault@....com, benh@...nel.crashing.org
Subject: Re: [PATCH 2/3] objtool: check: Support addition to set CFA base

On Tue, Sep 15, 2020 at 09:12:03AM +0100, Julien Thierry wrote:
> Instead of "mov SP, BP", a compiler could simply set BP
> to SP + constant. Handle changing the CFA base in such cases.

Rather than what a compiler _could_ do, it would be good to be specific
about when this can happen (presumably arm64).

-- 
Josh