[PATCH]: Support memory banks debug with 68HC12

[Stephane Carrez]

Hi!

This patch allows debugging 68HC12 code in its 16K memory bank window.
It creates a virtual PC (pseudo reg) which represents code in the banked memory.
It is computed using the real PC and the page number.  The banked memory is a
flat address space starting at hypothetical address 0x1000000.  It is accessed
using the 8-bit page register and the 14 lower bits of the PC.

I've committed this patch on mainline.  (but only tested with simple program).

	Stephane

2002-08-13  Stephane Carrez  <stcarrez@nerim.fr>

	* m68hc11-tdep.c (M68HC12_NUM_PSEUDO_REGS): New define.
	(M68HC12_HARD_PC_REGNUM): Define specific PC for 68HC12 (pseudo reg).
	(m68hc11_pseudo_register_read): Compute the 68HC12 PC using the
	real PC and the page number (if it's within the memory bank window).
	(m68hc11_pseudo_register_write): Likewise when saving.
	(m68hc11_register_name): Name the virtual pc 'pc' and the real one ppc.
	(m68hc11_register_virtual_type): Return uint32 for virtual pc.
	(m68hc11_register_raw_size): And use 32-bit for it.
	(m68hc11_gdbarch_init): Use 32-bit address for 68HC12 if the
	16K memory bank is used by the prog; also use the virtual pc.

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