/* Target machine description for EST-300, for GDB, the GNU debugger.
   Copyright 1994 Free Software Foundation, Inc.
   Contributed by Steve Chamberlain @ Cygnus Support.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */


/* GCC is probably the only compiler used on this configuration.  So
   get this right even if the code which detects gcc2_compiled. is
   still broken.  */

#define BELIEVE_PCC_PROMOTION 1

/* We have more complex, useful breakpoints on the target.  */
#define	DECR_PC_AFTER_BREAK	0

#define NUM_REGS 18

#include "m68k/tm-m68k.h"

#undef FRAME_CHAIN
#undef FRAME_CHAIN_VALID

/* Takes the current frame-struct pointer and returns the chain-pointer
   to get to the calling frame.

   If our current frame pointer is zero, we're at the top; else read out
   the saved FP from memory pointed to by the current FP.  */

#define FRAME_CHAIN(thisframe) \
  ((thisframe)->frame? read_memory_integer ((thisframe)->frame, 4): 0)

/* If the chain pointer is zero (either because the saved value fetched
   by FRAME_CHAIN was zero, or because the current FP was zero so FRAME_CHAIN
   never fetched anything), we are at the top of the stack.  */

#define FRAME_CHAIN_VALID(chain, thisframe) (chain != 0)