> From owner-port-sparc@NetBSD.ORG Sat Sep 16 22:19 PDT 1995
> Date: Sat, 16 Sep 1995 23:10:35 -0400
> From: "David S. Miller" <davem@caip.rutgers.edu>
> To: torek@bsdi.com
> Cc: port-sparc@netbsd.org
> Subject: Re: More on locore.s optimizations...
> X-Loop: port-sparc@NetBSD.ORG
> 
>    Date: Sat, 16 Sep 1995 20:56:59 -0600
>    From: Chris Torek <torek@BSDI.COM>
> 
>    (Rwindow trap screwups are VERY painful to debug...)
> 
> Yes I know, you cannot even step through the handlers using kadb
> forget kgdb.  This is why it is best to spend a lot of time on this
> code and every now and then scan it very carefully verifying what it
> does since it cannot possibly be debugged in any sane manner.
> 
> Later,
> David S. Miller
> davem@caip.rutgers.edu
> 


run it under a simulator... that's the best and easiest way. 

but, i know that this is not widely available, if at all..

-brad w.