Hi,
the attachd patch enables restoration of all registers when unwinding 
from a signal handler. Currenty only PC and SP were restored and it's a 
loss since all GPRs are there on the stack.
It's even more important for AMD64 because there parameters are usually 
passed in regs and not on the stack.

I did it for amd64-linux and i386-linux as I don't know appropriate 
offsets for other i386-targets. For this reason I kept a fallback to 
sc_pc_offset/sc_sp_offset.

Do you like the idea? Or would you choose a different approach?

Michal Ludvig
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