/* Disassemble MN10300 instructions.
   Copyright (C) 1996 Free Software Foundation, Inc.

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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */


#include <stdio.h>

#include "ansidecl.h"
#include "opcode/mn10300.h" 
#include "dis-asm.h"

static void disassemble PARAMS ((bfd_vma, struct disassemble_info *,
				 unsigned long insn, unsigned long,
				 unsigned int));

static const char *const mn10300_reg_names[] =
{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", };

int 
print_insn_mn10300 (memaddr, info)
     bfd_vma memaddr;
     struct disassemble_info *info;
{
  int status;
  bfd_byte buffer[4];
  unsigned long insn;
  unsigned long extension;
  unsigned int consume;

  /* First figure out how big the opcode is.  */
  status = (*info->read_memory_func) (memaddr, buffer, 1, info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, memaddr, info);
      return -1;
    }
  insn = *(unsigned char *) buffer;

  /* These are one byte insns XXX imm8 versions of mov, cmp.  */
  if ((insn & 0xf3) == 0x00
      || (insn & 0xf0) == 0x10
      || (insn & 0xfc) == 0x3c
      || (insn & 0xf3) == 0x41
      || (insn & 0xf3) == 0x40
      || (insn & 0xfc) == 0x50
      || (insn & 0xfc) == 0x54
      || (insn & 0xf0) == 0x60
      || (insn & 0xf0) == 0x70
      || ((insn & 0xf0) == 0x80
	  && (insn & 0x0c) >> 2 != (insn & 0x03))
      || ((insn & 0xf0) == 0x90
	  && (insn & 0x0c) >> 2 != (insn & 0x03))
      || ((insn & 0xf0) == 0xa0
	  && (insn & 0x0c) >> 2 != (insn & 0x03))
      || ((insn & 0xf0) == 0xb0
	  && (insn & 0x0c) >> 2 != (insn & 0x03))
      || (insn & 0xff) == 0xcb
      || (insn & 0xfc) == 0xd0
      || (insn & 0xfc) == 0xd4
      || (insn & 0xfc) == 0xd8
      || (insn & 0xf0) == 0xe0)
    {
      extension = 0;
      consume = 1;
    }

  /* These are two byte insns.  */
  else if ((insn & 0xf0) == 0x80
	   || (insn & 0xf0) == 0x90
	   || (insn & 0xf0) == 0xa0
	   || (insn & 0xf0) == 0xb0
	   || (insn & 0xfc) == 0x20
	   || (insn & 0xfc) == 0x28
	   || (insn & 0xf3) == 0x43
	   || (insn & 0xf3) == 0x42
	   || (insn & 0xfc) == 0x58
	   || (insn & 0xfc) == 0x5c
	   || ((insn & 0xf0) == 0xc0
	       && (insn & 0xff) != 0xcb
	       && (insn & 0xff) != 0xcc
	       && (insn & 0xff) != 0xcd)
	   || (insn & 0xff) == 0xf0
	   || (insn & 0xff) == 0xf1
	   || (insn & 0xff) == 0xf2
	   || (insn & 0xff) == 0xf3
	   || (insn & 0xff) == 0xf4
	   || (insn & 0xff) == 0xf5
	   || (insn & 0xff) == 0xf6)
    {
      status = (*info->read_memory_func) (memaddr, buffer, 2, info);
      if (status != 0)
	{
	  (*info->memory_error_func) (status, memaddr, info);
	   return -1;
	}
      insn = bfd_getb16 (buffer);
      extension = 0;
      consume = 2;
    }

  /* These are three byte insns.  */
  else if ((insn & 0xff) == 0xf8
	   || (insn & 0xff) == 0xcc 
	   || (insn & 0xff) == 0xf9
	   || (insn & 0xf3) == 0x01
	   || (insn & 0xf3) == 0x02
	   || (insn & 0xf3) == 0x03
	   || (insn & 0xfc) == 0x24
	   || (insn & 0xfc) == 0x2c
	   || (insn & 0xfc) == 0x30
	   || (insn & 0xfc) == 0x34
	   || (insn & 0xfc) == 0x38
	   || (insn & 0xff) == 0xde
	   || (insn & 0xff) == 0xdf
	   || (insn & 0xff) == 0xcc)
    {
      status = (*info->read_memory_func) (memaddr, buffer, 2, info);
      if (status != 0)
	{
	  (*info->memory_error_func) (status, memaddr, info);
	  return -1;
	}
      insn = bfd_getb16 (buffer);
      insn <<= 8;
      insn |= *(unsigned char *)buffer + 2;
      extension = 0;
      consume = 3;
    }

  /* These are four byte insns.  */
  else if ((insn & 0xff) == 0xfa
	   || (insn & 0xff) == 0xfb)
    {
      status = (*info->read_memory_func) (memaddr, buffer, 4, info);
      if (status != 0)
	{
	  (*info->memory_error_func) (status, memaddr, info);
	  return -1;
	}
      insn = bfd_getb32 (buffer);
      extension = 0;
      consume = 4;
    }

  /* These are five byte insns.  */
  else if ((insn & 0xff) == 0xcd
	   || (insn & 0xff) == 0xdc)
    {
      status = (*info->read_memory_func) (memaddr, buffer, 4, info);
      if (status != 0)
	{
	  (*info->memory_error_func) (status, memaddr, info);
	  return -1;
	}
      insn = bfd_getb32 (buffer);

      status = (*info->read_memory_func) (memaddr, buffer, 1, info);
      if (status != 0)
	{
	  (*info->memory_error_func) (status, memaddr, info);
	  return -1;
	}
      extension = *(unsigned char *) buffer + 4;
      consume = 5;
    }

  /* These are six byte insns.  */
  else if ((insn & 0xff) == 0xfd
	   || (insn & 0xff) == 0xfc)
    {
      status = (*info->read_memory_func) (memaddr, buffer, 4, info);
      if (status != 0)
	{
	  (*info->memory_error_func) (status, memaddr, info);
	  return -1;
	}

      insn = bfd_getb32 (buffer);
      status = (*info->read_memory_func) (memaddr, buffer, 2, info);
      if (status != 0)
	{
	  (*info->memory_error_func) (status, memaddr, info);
	  return -1;
	}
      extension = bfd_getb16 (buffer + 4);
      consume = 6;
    }

  /* Else its a seven byte insns (in theory).  */
  else
    {
      status = (*info->read_memory_func) (memaddr, buffer, 4, info);
      if (status != 0)
	{
	  (*info->memory_error_func) (status, memaddr, info);
	  return -1;
	}

      insn = bfd_getb32 (buffer);
      status = (*info->read_memory_func) (memaddr, buffer, 2, info);
      if (status != 0)
	{
	  (*info->memory_error_func) (status, memaddr, info);
	  return -1;
	}
      extension = bfd_getb16 (buffer);
      extension <<= 8;
      extension |= *(unsigned char *)buffer + 2;
      consume = 7;
    }

  disassemble (memaddr, info, insn, extension, consume);

  return consume;
}

static void
disassemble (memaddr, info, insn, extension, size)
     bfd_vma memaddr;
     struct disassemble_info *info;
     unsigned long insn;
     unsigned long extension;
     unsigned int size;
{
  struct mn10300_opcode *op = (struct mn10300_opcode *)mn10300_opcodes;
  const struct mn10300_operand *operand;
  int match = 0;

  /* Find the opcode.  */
  while (op->name)
    {
      int mysize;

      if (op->format == FMT_S0)
	mysize = 1;
      else if (op->format == FMT_S1
	       || op->format == FMT_D0)
	mysize = 2;
      else if (op->format == FMT_S2
	       || op->format == FMT_D1)
	mysize = 3;
      else if (op->format == FMT_S4)
	mysize = 5;
      else if (op->format == FMT_D2)
	mysize = 4;
      else if (op->format == FMT_D4)
	mysize = 6;
      else
	mysize = 7;
	
      if ((op->mask & insn) == op->opcode
	  && size == mysize)
	{
	  const unsigned char *opindex_ptr;
	  unsigned int opnum, memop;
	  
	  match = 1;
	  (*info->fprintf_func) (info->stream, "%s\t", op->name);

	  /* Now print the operands.  */
	  for (opindex_ptr = op->operands, opnum = 1;
	       *opindex_ptr != 0;
	       opindex_ptr++, opnum++)
	    {
	      unsigned long value;

	      operand = &mn10300_operands[*opindex_ptr];

	      value = (insn >> operand->shift) & ((1 << operand->bits) - 1);

	      if ((operand->flags & MN10300_OPERAND_SIGNED) != 0)
		value = ((long)(value << (32 - operand->bits))
			  >> (32 - operand->bits));

	  /* All done. */
	  break;
	}
      op++;
    }

  if (!match)
    {
	(*info->fprintf_func) (info->stream, "unknown\t0x%04x", insn);
    }
}