Re: [Qemu-devel] linux-user exception handling

[Blue Swirl]

On 8/27/08, Vince Weaver <address@hidden> wrote:
> On Mon, 25 Aug 2008, Blue Swirl wrote:
>
> >
> > No, register window handling and other exceptions are handled in
> > linux-user/main.c.
> >
>
>  You are right.  It can be frustrating tracing through the code trying to
> find out what is being called when.
>
>  In any case, I think I've found a bug with register-window handling.
>  When using sparc32plus, the "wim" value isn't being updated on a
> save_window() call.  Thus when later a "ta 3" (flush register windows) call
> happens, the wrong windows get written out to memory.
>
>  I've attached some sample code that shows this problem.
>
>  The patch below fixes this for me, but it should be looked over carefully
> because the register window code in qemu is deep magic.
>
>  This fix allows the spec2k gcc.scilab and fma3d benchmarks to progress
> further.

How is that possible, because V9 class CPUs do not have "wim"?