ok it seems gcc 2.95 is not good. so what of gdb?
even gdb-5.3 does not support back traces across signal handlers on ppc 
netbsd.
I have some better code but I'm not there yet. The offsets in rs6000_tdep.c
do not match the trampline14 code - but it seems there is more to this 
problem
than just that.

dje@watson.ibm.com wrote:

>    Upgrade to a newer version of GCC.  This is a known problem in GCC
>2.95. 
>
>David
>  
>