What should happen if a handler for a trap signal (SIGILL, SIGSYS,
SIGSEGV, SIGTRAP) returns, or if the signal's ignored?  Should the failed
instruction be retried, or should the machine skip on to the next
instruction?  Does this depend on which signal it is?  I'm trying to work
out what the right value to put in trapframes on ARM systems is, and
following what a sigcontext will need might be as good an approach as any.

-- 
Ben Harris                                                   <bjh21@netbsd.org>
Portmaster, NetBSD/arm26               <URL:http://www.netbsd.org/Ports/arm26/>