linux-kernel - Re: [PATCH 3/3] perf: parse the .debug_frame section in case .eh

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Date:	Fri, 6 Sep 2013 12:17:20 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Jean Pihet <jean.pihet@...aro.org>
Cc:	Will Deacon <will.deacon@....com>,
	"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>,
	Patch Tracking <patches@...aro.org>
Subject: Re: [PATCH 3/3] perf: parse the .debug_frame section in case
 .eh_frame is not present

On Fri, Sep 06, 2013 at 11:31:17AM +0200, Jean Pihet wrote:
> Hi Jiri,
> 
> On 5 September 2013 18:30, Jiri Olsa <jolsa@...hat.com> wrote:
> > On Wed, Sep 04, 2013 at 08:04:14PM +0200, Jean Pihet wrote:
> >> On ARM the debug info is not present in the .eh_frame sections but
> >> instead in .debug_frame.
> >> Use libunwind to load and parse the debug info.
> >
> > hum, cannot make final link:
> >
> > $ make LIBUNWIND_DIR=/opt/libunwind/
> >     CHK -fstack-protector-all
> >     CHK -Wstack-protector
> >     CHK -Wvolatile-register-var
> >     CHK -D_FORTIFY_SOURCE=2
> >     CHK bionic
> >     CHK libelf
> >     CHK libdw
> >     CHK -DLIBELF_MMAP
> >     CHK -DLIBELF_MMAP
> >     CHK libunwind
> >     CHK libaudit
> >
> > ...
> >
> > make[1]: `liblk.a' is up to date.
> >     SUBDIR /home/jolsa/linux-perf/tools/lib/traceevent/
> >     LINK perf
> > libperf.a(unwind.o): In function `find_proc_info':
> > /home/jolsa/linux-perf/tools/perf/util/unwind.c:339: undefined reference to `_Ux86_64_dwarf_find_debug_frame'
> > collect2: ld returned 1 exit status
> > make: *** [perf] Error 1
> >
> >
> > I'm using the latest code from git://git.sv.gnu.org/libunwind.git
> >
> > Looks like dwarf_find_debug_frame is not exported, although
> > it looks like it is based on what I see in libunwind sources ;-)
> >
> > What did I miss?
> libunwind needs to be configured with --enable-debug-frame for the
> debug_frame code to be included in the lib.
> On ARM the flag is always set while it isn't on x86. Here is the
> culprit below (lines from libunwind configure).

yay, thats it!

> 
> Should that be changed in configure along with the changes in tools/perf?

I guess it's ok

Other than that tabs misformating the 'perf tool' change looks ok.

I tested the '.eh_frame' code and it's still working. Once
I figure out how to create a x86 binary with .debug_frame
data I'll test the code itself ;-)

If you could think of any automated testcase for this that could
be added under 'tests' that'd be nice (not necessarily)

thanks,
jirka
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