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Re: [PATCH] libdwfl: Make sure to set the CFI return register only once (for ppc64).
- From: Mark Wielaard <mjw at redhat dot com>
- To: elfutils-devel at lists dot fedorahosted dot org
- Date: Mon, 23 Dec 2013 21:54:26 +0100
- Subject: Re: [PATCH] libdwfl: Make sure to set the CFI return register only once (for ppc64).
On Mon, 2013-12-23 at 15:19 +0100, Jan Kratochvil wrote:
> On Sat, 21 Dec 2013 21:56:35 +0100, Mark Wielaard wrote:
> > On PPC64 there are two DWARF registers numbers that can represent the
> > same register. If that register is the CIE return register then we only
> > want to set it once. The second setting will confuse the unwinder.
> Could you provide reproducibility information?
See the original bug report for the exact libgcc.so version and the CFI
that caused the issue. It was on the machine that I gave you access to
> I have already tried ppc64 (with ppc biarch enabled) on RHEL-6 and F-19 and
> both machines PASS all the testcases (one is SKIPped).
Yes, they only needed one patch [tests: backtrace.c only check we caught
the last instruction on x86_64.] which is now on master.