On Sat, Jan 19, 2002 at 01:35:38AM +0100, Kevin D. Kissell wrote:
> It would, in principle, be possible to save/restore k0
> or k1 (but not both) if no other clever solution can be found.
> There are other VM OSes that manage to do so for MIPS,
> for other outside-the-old-ABI reasons. It does, of course,
> add some instructions and some memory traffic to the
> low-level exception handling , and we would have to look
> at whether we would want to make such a feature standard
> or specific to a "thread-ready" kernel build.
I like the read-only k0 idea. We just need to make a system call to
tell kernel what value to put in k0 before returning to the user space.
It shouldn't be too hard to implement. I will try it next week.