The following patch enhances the frame id support to allow an architecture
to set a special address for the frame.  This enables architectures such as the
ia64 (which has a 2nd stack) to properly mark distinct frames.  I added a
new routine that builds frame ids that has a special address parameter.  The
current frame_id_build() has been changed to call the new routine with a default
special address of 0.  This means that existing calls to frame_id_build() require
no changes.

Ok to commit to mainline?

-- Jeff J.

2003-10-06  Jeff Johnston  <jjohnstn@redhat.com>

	* frame.h (struct frame_id): Add new field: special_addr.
	(frame_id_build_special): New prototype.
	* frame.c (frame_id_build_special): New function.
	(frame_id_build): Change to call frame_id_build_special().
	(frame_id_eq): Change to also test special_addr field.