/* Definitions to make GDB run on an Altos 3068 (m68k running SVR2)
   Copyright (C) 1987,1989 Free Software Foundation, Inc.

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.  */

/* Define BPT_VECTOR if it is different than the default.
   This is the vector number used by traps to indicate a breakpoint. */

#define BPT_VECTOR 0xe

/* Define this if the C compiler puts an underscore at the front
   of external names before giving them to the linker.  */

#undef NAMES_HAVE_UNDERSCORE

/* Exec files and symbol tables are in COFF format */

#define COFF_FORMAT
#define COFF_NO_LONG_FILE_NAMES

/* Address of end of stack space.  */

/*#define STACK_END_ADDR (0xffffff)*/
#define STACK_END_ADDR (0x1000000)

/* Amount PC must be decremented by after a breakpoint.
   This is often the number of bytes in BREAKPOINT
   but not always.
   On the Altos, the kernel resets the pc to the trap instr */

#define DECR_PC_AFTER_BREAK 0


/* Things needed for making the inferior call functions.  */

/* Push an empty stack frame, to record the current PC, etc.  */

#define PUSH_DUMMY_FRAME \
{ register CORE_ADDR sp = read_register (SP_REGNUM);			\
  register int regnum;							\
  char raw_buffer[12];							\
  sp = push_word (sp, read_register (PC_REGNUM));			\
  sp = push_word (sp, read_register (FP_REGNUM));			\
  write_register (FP_REGNUM, sp);					\
  for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)		\
    { read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);	\
      sp = push_bytes (sp, raw_buffer, 12); }				\
  for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)			\
    sp = push_word (sp, read_register (regnum));			\
  sp = push_word (sp, read_register (PS_REGNUM));			\
  write_register (SP_REGNUM, sp);  }

/* Discard from the stack the innermost frame, 
   restoring all saved registers.  */

#define POP_FRAME  \
{ register FRAME frame = get_current_frame ();				\
  register CORE_ADDR fp;						\
  register int regnum;							\
  struct frame_saved_regs fsr;						\
  struct frame_info *fi;						\
  char raw_buffer[12];							\
  fi = get_frame_info (frame);						\
  fp = fi->frame;							\
  get_frame_saved_regs (fi, &fsr);					\
  for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)		\
    if (fsr.regs[regnum])						\
      { read_memory (fsr.regs[regnum], raw_buffer, 12);			\
        write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\
  for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)			\
    if (fsr.regs[regnum])						\
      write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
  if (fsr.regs[PS_REGNUM])						\
    write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \
  write_register (FP_REGNUM, read_memory_integer (fp, 4));		\
  write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));  	\
  write_register (SP_REGNUM, fp + 8);					\
  flush_cached_frames ();						\
  set_current_frame (create_new_frame (read_register (FP_REGNUM),	\
					read_pc ())); }


#include "tm-68k.h"