it seems that that ia64 setjmp/longjmp (as currently implemented) cannot
be used to switch stacks. this leaves three options (unless someone else
has another suggestion):
1. implement the savecontext/returnto via process.s
2. add extra code around setjmp/longjmp sequences to preverse the needed info
3. use the pthread version of lwp
i am leaning toward 3 here but do any of the ports actually use the pthread
code in lwp?
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