Hi,

I was just looking over the code and noticed that we currently use a per 
process undefined instruction stack.  I was wondering if anyone knew why?

We appear to actually setup a global one but then create one for every 
process created.

I'd rather like to switch to using a global one as it means that we don't 
have to keep saving and restoring the undef instr stack pointer, and so 
simplifies the code.

Cheers,
Chris