On Sun, Feb 25, 2001 at 04:26:34PM +0000, Ben Harris wrote:

 > Ugh.  This is a bit awkward.  At the moment, we keep the user registers on
 > the kernel stack, and have a (probably constant) pointer to them from the
 > pcb (or proc structure on arm32).  Moving them to the pcb will entail
 > either changing the exception entry code to be able to find the pcb or
 > copying the registers fram the stack to the pcb when necessary (which is
 > probably immediately after the exception if we want them to be in place
 > for a potential panic).

Yah, I agree with Ben here -- e.g. Alpha and MIPS don't store all user
registers in the PCB -- only a few that are needed to get at the rest of
the user state on the kernel stack.

-- 
        -- Jason R. Thorpe <thorpej@zembu.com>