>* what opcodes need to be emulated? <snip> > * all 386->486 opcodes (there's just a few of them, right?) This is the correct answer. :-) Then all programs can be compiled with gcc --arch=i486 --tune=i686 (which should probably be mandated as the standard, in fact).
>* do you need SMP on 80386? Is there even such thing as 80386 SMP > machines? Not requiring SMP support would make the ABI change > trivial... I think there is no such thing as SMP for 80386. -- Nathanael Nerode <neroden at gcc.gnu.org> http://home.twcny.rr.com/nerode/neroden/fdl.html
