[PATCH]: Fix HC12 gas to handle indexed addressing mode (Bug savannah/1825)

[Stephane Carrez]

Hi!

The gas HC12 is handling PC-relative addressing modes incorrectly.  This is reported in:

http://savannah.gnu.org/bugs/?func=detailbug&bug_id=1825&group_id=2424

This patch fixes that and also improves the assembler to use either a 5, 9 or 16-bit
offset in the case an offset is not yet known at the place it is used (we were always
using a 16-bit offset, even if it was resolved later on).  To handle the 'sym1 - sym2'
offset case, I've followed the cris port and provide a specific md_relax_frag.

Committed.  Update of gas testsuite to follow.

	Stephane

2002-12-01  Stephane Carrez  <stcarrez@nerim.fr>

	Fix Bug savannah/1825:
	* config/tc-m68hc11.h (md_relax_frag): Define to support relaxations
	that are not pc-relative.
	(m68hc11_relax_frag): Declare.

	* config/tc-m68hc11.c (build_indexed_byte): Use a frag_var to handle
	the offsetable indexed addressing modes (n,r).
	(build_insn): Cleanup some locals.
	(m68hc11_relax_frag): New function imported from tc-cris.c to handle
	relaxation of difference between two symbols of same section.
	(md_convert_frag): For INDEXED_OFFSET relaxs, use the displacement
	only when this is a PC-relative operand and the offset is not absolute.
	(md_estimate_size_before_relax): Convert the INDEXED_OFFSET,UNDEF frag
	to INDEXED_OFFSET,STATE_BITS5 when the symbol is absolute; this will
	be handled by m68hc11_relax_frag.
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