Patches for FreeBSD 4.2

[Stu Grossman]

Mark Kettenis writes:
 > * This file won't compile on FreeBSD 3.x, since <machine/sigframe.h>
 >   doesn't exist.  Besides, the implementation of a *_frame_saved_pc
 >   function belongs in a target-dependent file, and shouldn't depend on
 >   the target headers.  What's wrong with the old implementation?

Let me clarify my previous message...  This needs to be fixed in order to make
backtraces through signal handlers work.  I think that without this fix, the
backtrace stops at the signal handler, or worse yet, it prints junk for the
caller or the interrupted code.

			Stu