> > Are there any patches around that emulate the BWX instruction set on
> > older Alpha CPUs, or should I write it myself?
>
> There's an ancient one at
> http://www.alphalinux.org/archives/axp-list/October1999/0500.html,
> although it's probably easier to write it from scratch. I'd write the
> whole thing in C, the trap is already so expensive that it's of no use
> trying to be clever when emulating the particular instructions (except
> when you replace the instruction with a jump to a stub, which seems
> somewhat hairy, but feasible).
If you think that's hairy, take a look at this:
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/tc2/tc2/include/Attic/tc2_autoload.h?rev=1.1.2.5&only_with_tag=dev-0_4&content-type=text/vnd.viewcvs-markup
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