> >cpu : Cypress/ROSS CY7C601 > > I think that is indeed a SPARCv7 chip. Looks like the "sun4m implies > sparcv8" rule is not entirely hard and fast. > > Globally enabling kernel emulation of umul for sun4m shouldn't do any > harm, so that seems like the best approach. Or, if one wanted to be > really careful, the kernel does know the exact cpu model so the > emulation could be enabled only for those Cypress parts.
Maybe, kernel should test for [us]mul in the illegal instruction trap handler, and if detected emulate those instructions, increase instruction counter and return from the trap ?
