[PATCH] ppc64: Add minimal fallback unwinder.

[Mark Wielaard]

On Tue, 2017-05-30 at 13:28 +0530, Naveen N. Rao wrote:
> > +  if (! readfunc(sp + LR_OFFSET, &newLr, arg))
> 
> should this be newSp + LR_OFFSET, since the LR save area is in the 
> caller's stack frame?

Of course. You are entirely right.

This also explains why the testcase didn't seem to work correctly.
It actually does with this change. I should have been more suspicious
about that then just assuming it was because the link register couldn't
always be retrieved correctly. It actually can if we pick it from the
right location!

Attached the fixed patch plus a testcase (actual binaries removed from
patch, but testcase documents how they were generated - precisely like
for the other arches).

Thanks,

Mark
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