On Fri, Jan 18, 2002 at 10:19:08AM -0800, H . J . Lu wrote: > > MIPS: Who feels responsible? Andreas, HJ? > > > > I don't see there are any registers we can use without breaking ABI. > On the other hand, can we change the mips kernel to save k0 or k1 for > user space? No, there are no free registers and $k0/$k1 are needed by the kernel for exceptions. The only way I can see to do this would be to change the ABI. There are none available; the least used that I see is $v1, but $v1 is used to return half of a double precision return value. We would have to steal one of the existing call-saved or call-clobbered registers. -- Daniel Jacobowitz Carnegie Mellon University MontaVista Software Debian GNU/Linux Developer
