[RFC]: MD_FALLBACK_FRAME_STATE_FOR macro for darwin PPC

[David Daney]

Andreas Tobler wrote:

> David Daney wrote:
>
>
>> I know next to nothing about PPC ABIs, but are any of these floating 
>> point registers?
>
>
> There are, yes.
>
>> Are there any call saved FP registers in this ABI? and if so are you 
>> restoring them.  Although I don't think that the unwinder uses 
>> floating point, it seems that restoring call saved FP registers is a 
>> good idea if you are not already doing it.
>
>
> Well, here I expect the advise from the experts, I have floats around 
> and I may try to restore them.
>
> But, I need some guidance here.

When I did the MD_FALLBACK_FRAME_STATE_FOR for mips/linux I did not 
handle floating point either as the problem did not occur to me until 
after I checked in the code.

However after thinking about it and posting:

http://gcc.gnu.org/ml/gcc/2003-10/msg00972.html

I learned that this is a real issue.

I may be about ready to do some more mips/linux work soon and may 
revisit MD_FALLBACK_FRAME_STATE_FOR.  Because in its current state it 
seems to be incomplete.

David Daney.