[RFC 4.8] use ip+cfa to identify unwind frames, if possible

[Richard Henderson <rth at redhat dot com>]

On 02/16/2012 11:54 AM, Richard Henderson wrote:
> I'll work on a proper fix to the unwinder; we can then decide
> whether and when to apply it...

Something like this.  Not the best of solutions, but we've run out
of bits in the exception structure, and thus we can't use this 
solution universally.

It shouldn't matter for most CISC targets, like x86, which always
push the return address onto the stack; one never winds up with
the situation you saw on mips where the return address is held 
only in a (special) register.


r~

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