linux-kernel - Re: [PATCH] ARM64: unwind: Fix PC calculation

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Message-ID: <BBC3AB9B-17A9-4112-B8CC-D3DCB3B673D9@arm.com>
Date:	Sat, 15 Feb 2014 10:28:15 +0000
From:	Catalin Marinas <Catalin.Marinas@....com>
To:	Olof Johansson <olof@...om.net>
CC:	Will Deacon <Will.Deacon@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] ARM64: unwind: Fix PC calculation

On 14 Feb 2014, at 19:35, Olof Johansson <olof@...om.net> wrote:
> The frame PC value in the unwind code used to just take the saved LR
> value and use that.  That's incorrect as a stack trace, since it shows
> the return path stack, not the call path stack.
>
> In particular, it shows faulty information in case the bl is done as
> the very last instruction of one label, since the return point will be
> in the next label. That can easily be seen with tail calls to panic(),
> which is marked __noreturn and thus doesn't have anything useful after it.
>
> Easiest here is to just correct the unwind code and do a -4, to get the
> actual call site for the backtrace instead of the return site.
>
> Signed-off-by: Olof Johansson <olof@...om.net>
> Cc: stable@...r.kernel.org

Looks fine. I’ll push it sometime next week. Thanks.

Catalin

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