On 26 Oct 2006, at 5:14 PM, Pavel Cahyna wrote:

> There is some hint in this PR:
>
> http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=34269

Aha... I hadn't found that PR. This comment by christos gives me a  
really good clue about what parts of the SPARC trap handling I need  
to bone up on:

     It is indeed related to register windows; having to take a fault  
while context
     switching to bring in registers from the stack is a no-no. How  
to fix it is
     a different story.

Thanks for the pointer. Now, I need to find a good SPARC trap and  
context switching reference, since this will take me beyond my  
current knowledge very shortly. SPARC assembler I can handle, but...

A'web-searching I go.

- Geoff