Quoting Matthias Drochner <drochner@netbsd.org>:

> 
> Module Name:	src
> Committed By:	drochner
> Date:		Thu Dec  7 13:38:19 UTC 2006
> 
> Modified Files:
> 	src/gnu/dist/gdb6/gdb: i386nbsd-tdep.c
> 
> Log Message:
> Update code for recognition of signal trampolines to the new "setcontext"
> type, and update register offsets for ucontext/mcontext.
> Now a backtrace crossing a signal handler invocation works.
> Approved by christos.

Shouldn't we keep the recognition of the old style signal handler and 
possibliy recognise the 3 versions of __sigtramp_siginfo_2 that have
existed at various points?

Nick