[PATCH] Regression fix for PR target/61223

[Alexey Merzlyakov]

On 20.05.2014 20:24, Ramana Radhakrishnan wrote:
> For now, please revert your original patch and one of Richard or me 
> will try to look at it in the morning. The thumb1 case is slightly 
> more complicated than this.
>
> I don't like this approach as you are introducing the problem again in 
> ARM state
I am not sure, could you provide more details: why do you think ARM 
state is invalid here?

> and leaving the problem as is for Thumb1.
True. I've came up a new draft implementation which supports also thumb1 
(untested). Does it look saner?

Actually, it seems "pop lr" is not really necessary because following by 
"bl _Unwind_Resume @ Never returns" instruction overwrites lr immediately.
Perhaps it may make sense to replace "bl _Unwind_Resume" with "b 
_Unwind_Resume" to keep backtracing also in _Unwind_Resume?

Best regards,
Merzlyakov Alexey
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