[PATCH 5/5] Add frame pointer unwinding for aarch64

Mark Wielaard mark@klomp.org
Thu Apr 27 15:09:00 GMT 2017

On Thu, Apr 27, 2017 at 10:31:55AM +0200, Ulf Hermann wrote:
> > Maybe something like the attached patch?
> Well that's actually the original patch (as opposed to V2) with relaxed test
> conditions. You can write that a bit nicer by setting the new PC directly
> after retrieving LR and returning early if it doesn't work. See "[PATCH 2/3]
> Add frame pointer unwinding as fallback on arm" from February 16th. That's
> the original algorithm; for aarch64 I just added a few defines and included
> arm_unwind.c.

I think the simplier implementation with relaxed test is better.
I'll adjust the patch to look more like your original.

> It's in fact a bit annoying for my use case as the non-CFI stack sections
> are mostly in between CFI-enabled stack sections here. However, I can accept
> this.

Does every fp-only frame gets duplicated after a DWARF CFI frame?
I'll look if I can better understand why that is.



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