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/* Disassemble D10V instructions.

   Copyright 1996, 1997, 1998, 2000 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 "sysdep.h"

#include "opcode/d10v.h" 

#include "dis-asm.h"

/* the PC wraps at 18 bits, except for the segment number */

/* so use this mask to keep the parts we want */

#define PC_MASK 0x0303FFFF

static void dis_2_short PARAMS ((unsigned long insn, bfd_vma memaddr,

                                 struct disassemble_info *info, int order));

static void dis_long PARAMS ((unsigned long insn, bfd_vma memaddr,

                              struct disassemble_info *info));

int

print_insn_d10v (memaddr, info)

     bfd_vma memaddr;

     struct disassemble_info *info;

{

  int status;

  bfd_byte buffer[4];

  unsigned long insn;

  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 = insn & FM11;

  switch (status) {

  case 0:

    dis_2_short (insn, memaddr, info, 2);

    break;

  case FM01:

    dis_2_short (insn, memaddr, info, 0);

    break;

  case FM10:

    dis_2_short (insn, memaddr, info, 1);

    break;

  case FM11:

    dis_long (insn, memaddr, info);

    break;

  }

  return 4;

}

static void

print_operand (oper, insn, op, memaddr, info)

     struct d10v_operand *oper;

     unsigned long insn;

     struct d10v_opcode *op;

     bfd_vma memaddr;

     struct disassemble_info *info;

{

  int num, shift;

  if (oper->flags == OPERAND_ATMINUS)

    {

      (*info->fprintf_func) (info->stream, "@-");

      return;

    }

  if (oper->flags == OPERAND_MINUS)

    {

      (*info->fprintf_func) (info->stream, "-");

      return;

    }

  if (oper->flags == OPERAND_PLUS)

    {

      (*info->fprintf_func) (info->stream, "+");

      return;

    }

  if (oper->flags == OPERAND_ATSIGN)

    {

      (*info->fprintf_func) (info->stream, "@");

      return;

    }

  if (oper->flags == OPERAND_ATPAR)

    {

      (*info->fprintf_func) (info->stream, "@(");

      return;

    }

  shift = oper->shift;

  /* the LONG_L format shifts registers over by 15 */

  if (op->format == LONG_L && (oper->flags & OPERAND_REG))

    shift += 15;

  num = (insn >> shift) & (0x7FFFFFFF >> (31 - oper->bits));

  if (oper->flags & OPERAND_REG)

    {

      int i;

      int match=0;

      num += (oper->flags

              & (OPERAND_GPR|OPERAND_FFLAG|OPERAND_CFLAG|OPERAND_CONTROL));

      if (oper->flags & (OPERAND_ACC0|OPERAND_ACC1))

        num += num ? OPERAND_ACC1 : OPERAND_ACC0;

      for (i = 0; i < d10v_reg_name_cnt(); i++)

        {

          if (num == d10v_predefined_registers[i].value)

            {

              if (d10v_predefined_registers[i].pname)

                (*info->fprintf_func) (info->stream, "%s",d10v_predefined_registers[i].pname);

              else

                (*info->fprintf_func) (info->stream, "%s",d10v_predefined_registers[i].name);

              match=1;

              break;

            }

        }

      if (match == 0)

        {

          /* this would only get executed if a register was not in the

             register table */

          if (oper->flags & (OPERAND_ACC0|OPERAND_ACC1))

            (*info->fprintf_func) (info->stream, "a");

          else if (oper->flags & OPERAND_CONTROL)

            (*info->fprintf_func) (info->stream, "cr");

          else if(oper->flags & OPERAND_REG)

            (*info->fprintf_func) (info->stream, "r");

          (*info->fprintf_func) (info->stream, "%d",num);

        }

    }

  else

    {

      /* addresses are right-shifted by 2 */

      if (oper->flags & OPERAND_ADDR)

        {

          long max;

          int neg=0;

          max = (1 << (oper->bits - 1));

          if (num & max)

            {

              num = -num & ((1 << oper->bits)-1);

              neg = 1;

            }

          num = num<<2;

          if (info->flags & INSN_HAS_RELOC)

            (*info->print_address_func) (num & PC_MASK, info);

          else

            {

              if (neg)

                (*info->print_address_func) ((memaddr - num) & PC_MASK, info);

              else

                (*info->print_address_func) ((memaddr + num) & PC_MASK, info);

            }

        }

      else

        {

          if (oper->flags & OPERAND_SIGNED)

            {

              int max = (1 << (oper->bits - 1));

              if (num & max)

                {

                  num = -num & ((1 << oper->bits)-1);

                  (*info->fprintf_func) (info->stream, "-");

                }

            }

          (*info->fprintf_func) (info->stream, "0x%x",num);

        }

    }

}

static void

dis_long (insn, memaddr, info)

     unsigned long insn;

     bfd_vma memaddr;

     struct disassemble_info *info;

{

  int i;

  char buf[32];

  struct d10v_opcode *op = (struct d10v_opcode *)d10v_opcodes;

  struct d10v_operand *oper;

  int need_paren = 0;

  int match = 0;

  while (op->name)

    {

      if ((op->format & LONG_OPCODE) && ((op->mask & insn) == op->opcode))

        {

          match = 1;

          (*info->fprintf_func) (info->stream, "%s\t", op->name);

          for ( i=0; op->operands[i]; i++)

            {

              oper = (struct d10v_operand *)&d10v_operands[op->operands[i]];

              if (oper->flags == OPERAND_ATPAR)

                need_paren = 1;

              print_operand (oper, insn, op, memaddr, info);

              if (op->operands[i+1] && oper->bits &&

                  d10v_operands[op->operands[i+1]].flags != OPERAND_PLUS &&

                  d10v_operands[op->operands[i+1]].flags != OPERAND_MINUS)

                (*info->fprintf_func) (info->stream, ", ");

            }

          break;

        }

      op++;

    }

  if (!match)

    (*info->fprintf_func) (info->stream, ".long\t0x%08x",insn);

  if (need_paren)

    (*info->fprintf_func) (info->stream, ")");

}

static void

dis_2_short (insn, memaddr, info, order)

     unsigned long insn;

     bfd_vma memaddr;

     struct disassemble_info *info;

     int order;

{

  int i,j;

  char astr[2][32];

  unsigned int ins[2];

  struct d10v_opcode *op;

  char buf[32];

  int match, num_match=0;

  struct d10v_operand *oper;

  int need_paren = 0;

  ins[0] = (insn & 0x3FFFFFFF) >> 15;

  ins[1] = insn & 0x00007FFF;

  for(j=0;j<2;j++)

    {

      op = (struct d10v_opcode *)d10v_opcodes;

      match=0;

      while (op->name)

        {

          if ((op->format & SHORT_OPCODE) && ((op->mask & ins[j]) == op->opcode))

            {

              (*info->fprintf_func) (info->stream, "%s\t",op->name);

              for (i=0; op->operands[i]; i++)

                {

                  oper = (struct d10v_operand *)&d10v_operands[op->operands[i]];

                  if (oper->flags == OPERAND_ATPAR)

                    need_paren = 1;

                  print_operand (oper, ins[j], op, memaddr, info);

                  if (op->operands[i+1] && oper->bits &&

                  d10v_operands[op->operands[i+1]].flags != OPERAND_PLUS &&

                  d10v_operands[op->operands[i+1]].flags != OPERAND_MINUS)

                    (*info->fprintf_func) (info->stream, ", ");

                }

              match = 1;

              num_match++;

              break;

            }

          op++;

        }

      if (!match)

        (*info->fprintf_func) (info->stream, "unknown");

      switch (order)

        {

        case 0:

          (*info->fprintf_func) (info->stream, "\t->\t");

          order = -1;

          break;

        case 1:

          (*info->fprintf_func) (info->stream, "\t<-\t");

          order = -1;

          break;

        case 2:

          (*info->fprintf_func) (info->stream, "\t||\t");

          order = -1;

          break;

        default:

          break;

        }

    }

  if (num_match == 0)

    (*info->fprintf_func) (info->stream, ".long\t0x%08x",insn);

  if (need_paren)

    (*info->fprintf_func) (info->stream, ")");

}