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. H.J.
