Re: Bug#111581: [firstname.lastname@example.org: Bug#111581: what to do about umul instructions and old SPARC boxen]
> >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 ?