From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Julien Thierry <jthierry@redhat.com>
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org,
mbenes@suse.cz, raphael.gault@arm.com, benh@kernel.crashing.org
Subject: Re: [PATCH 2/3] objtool: check: Support addition to set CFA base
Date: Fri, 18 Sep 2020 16:09:27 -0500 [thread overview]
Message-ID: <20200918210927.eh2tilurtuhc6q4a@treble> (raw)
In-Reply-To: <20200915081204.9204-3-jthierry@redhat.com>
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
next prev parent reply other threads:[~2020-09-18 21:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-15 8:12 [PATCH 0/3] objtool: Extend CFA updating/checking Julien Thierry
2020-09-15 8:12 ` [PATCH 1/3] objtool: check: Fully validate the stack frame Julien Thierry
2020-09-18 20:56 ` Josh Poimboeuf
2020-09-21 10:31 ` Julien Thierry
2020-09-21 15:03 ` Josh Poimboeuf
2020-09-15 8:12 ` [PATCH 2/3] objtool: check: Support addition to set CFA base Julien Thierry
2020-09-18 21:09 ` Josh Poimboeuf [this message]
2020-09-15 8:12 ` [PATCH 3/3] objtool: check: Make SP memory operation match PUSH/POP semantics Julien Thierry
2020-09-18 21:43 ` Josh Poimboeuf
2020-09-21 10:31 ` Julien Thierry
2020-09-21 15:12 ` Josh Poimboeuf
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