linux-kernel - Re: [PATCH 3/3] perf tools: Add libdw DWARF post unwind support for ARM

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Message-ID: <CAFrcx1mkE-N+DYUe0ZK06_BL1tsZvmyMHpAynnFkgZBqjghE5Q@mail.gmail.com>
Date:	Wed, 7 May 2014 12:14:18 +0200
From:	Jean Pihet <jean.pihet@...aro.org>
To:	Will Deacon <will.deacon@....com>
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Ahern <dsahern@...il.com>, Mark Wielaard <mjw@...hat.com>
Subject: Re: [PATCH 3/3] perf tools: Add libdw DWARF post unwind support for ARM

On 7 May 2014 12:00, Will Deacon <will.deacon@....com> wrote:
> On Wed, May 07, 2014 at 10:52:05AM +0100, Jean Pihet wrote:
>> On 6 May 2014 19:56, Will Deacon <will.deacon@....com> wrote:
>> > On Tue, May 06, 2014 at 04:26:19PM +0100, Jean Pihet wrote:
>> >> Adding libdw DWARF post unwind support, which is part
>> >> of elfutils-devel/libdw-dev package from version 0.158.
>> >>
>> >> The new code is contained in unwin-libdw.c object, and
>> >> implements unwind__get_entries unwind interface function.
>> >
>> >   Reviewed-by: Will Deacon <will.deacon@....com>
>>
>> Ok, thx!
>>
>> Jiri, Arnaldo,
>> Can you take the series for ARM and ARM64?
>
> Wait: I thought you were going to add compat support for arm64? I haven't
> acked that patch yet, because it's lacking those changes.
The compat mode is supported by libdw and _should_ work in principle.
I am following it up with Mark Wielaard on elfutils-devel.
Cf. [1] for the discussion and [2] for the compat mode support in libdw.

[1] https://lists.fedorahosted.org/pipermail/elfutils-devel/2014-March/003905.html
[2] https://lists.fedorahosted.org/pipermail/elfutils-devel/2014-March/003910.html

So in summary the kernel changes should be fine (it works ok with
libunwind), the problem lies somewhere in the libdw registers setup
and usage for compat mode.

>
> The 32-bit ARM patches look fine though.
Thx!

>
> Will

Jean
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