Subversion Repositories openrisc_me

/* Disassemble D10V instructions.

   Copyright 1996, 1997, 1998, 2000, 2001, 2005, 2007

   Free Software Foundation, Inc.

   This file is part of the GNU opcodes library.

   This library 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 3, or (at your option)

   any later version.

   It 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., 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, 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

print_operand (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 & ~ OPERAND_SP))

            {

              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 & REGISTER_MASK);

        }

    }

  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 (unsigned long insn,

          bfd_vma memaddr,

          struct disassemble_info *info)

{

  int i;

  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) == (unsigned long) 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%08lx", insn);

  if (need_paren)

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

}

static void

dis_2_short (unsigned long insn,

             bfd_vma memaddr,

             struct disassemble_info *info,

             int order)

{

  int i, j;

  unsigned int ins[2];

  struct d10v_opcode *op;

  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)

              && ((((unsigned int) op->mask) & ins[j])

                  == (unsigned int) 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%08lx", insn);

  if (need_paren)

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

}

int

print_insn_d10v (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;

}