Subversion Repositories open8_urisc

/* Disassemble moxie instructions.

   Copyright 2009

   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"

#define STATIC_TABLE

#define DEFINE_TABLE

#include "opcode/moxie.h"

#include "dis-asm.h"

static fprintf_ftype fpr;

static void *stream;

/* Macros to extract operands from the instruction word.  */

#define OP_A(i) ((i >> 4) & 0xf)

#define OP_B(i) (i & 0xf)

#define INST2OFFSET(o) ((((signed short)((o & ((1<<10)-1))<<6))>>6)<<1)

static const char * reg_names[16] =

  { "$fp", "$sp", "$r0", "$r1", "$r2", "$r3", "$r4", "$r5",

    "$r6", "$r7", "$r8", "$r9", "$r10", "$r11", "$r12", "$r13" };

int

print_insn_moxie (bfd_vma addr, struct disassemble_info * info)

{

  int length = 2;

  int status;

  stream = info->stream;

  const moxie_opc_info_t * opcode;

  bfd_byte buffer[4];

  unsigned short iword;

  fpr = info->fprintf_func;

  if ((status = info->read_memory_func (addr, buffer, 2, info)))

    goto fail;

  iword = bfd_getb16 (buffer);

  /* Form 1 instructions have the high bit set to 0.  */

  if ((iword & (1<<15)) == 0)

    {

      /* Extract the Form 1 opcode.  */

      opcode = &moxie_form1_opc_info[iword >> 8];

      switch (opcode->itype)

        {

        case MOXIE_F1_NARG:

          fpr (stream, "%s", opcode->name);

          break;

        case MOXIE_F1_A:

          fpr (stream, "%s\t%s", opcode->name,

               reg_names[OP_A(iword)]);

          break;

        case MOXIE_F1_AB:

          fpr (stream, "%s\t%s, %s", opcode->name,

               reg_names[OP_A(iword)],

               reg_names[OP_B(iword)]);

          break;

        case MOXIE_F1_A4:

          {

            unsigned imm;

            if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))

              goto fail;

            imm = bfd_getb32 (buffer);

            fpr (stream, "%s\t%s, 0x%x", opcode->name,

                 reg_names[OP_A(iword)], imm);

            length = 6;

          }

          break;

        case MOXIE_F1_4:

          {

            unsigned imm;

            if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))

              goto fail;

            imm = bfd_getb32 (buffer);

            fpr (stream, "%s\t0x%x", opcode->name, imm);

            length = 6;

          }

          break;

        case MOXIE_F1_M:

          {

            unsigned imm;

            if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))

              goto fail;

            imm = bfd_getb32 (buffer);

            fpr (stream, "%s\t", opcode->name);

            info->print_address_func ((bfd_vma) imm, info);

            length = 6;

          }

          break;

        case MOXIE_F1_AiB:

          fpr (stream, "%s\t(%s), %s", opcode->name,

               reg_names[OP_A(iword)], reg_names[OP_B(iword)]);

          break;

        case MOXIE_F1_ABi:

          fpr (stream, "%s\t%s, (%s)", opcode->name,

               reg_names[OP_A(iword)], reg_names[OP_B(iword)]);

          break;

        case MOXIE_F1_4A:

          {

            unsigned imm;

            if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))

              goto fail;

            imm = bfd_getb32 (buffer);

            fpr (stream, "%s\t0x%x, %s",

                 opcode->name, imm, reg_names[OP_A(iword)]);

            length = 6;

          }

          break;

        case MOXIE_F1_AiB4:

          {

            unsigned imm;

            if ((status = info->read_memory_func (addr+2, buffer, 4, info)))

              goto fail;

            imm = bfd_getb32 (buffer);

            fpr (stream, "%s\t0x%x(%s), %s", opcode->name,

                 imm,

                 reg_names[OP_A(iword)],

                 reg_names[OP_B(iword)]);

            length = 6;

          }

          break;

        case MOXIE_F1_ABi4:

          {

            unsigned imm;

            if ((status = info->read_memory_func (addr+2, buffer, 4, info)))

              goto fail;

            imm = bfd_getb32 (buffer);

            fpr (stream, "%s\t%s, 0x%x(%s)",

                 opcode->name,

                 reg_names[OP_A(iword)],

                 imm,

                 reg_names[OP_B(iword)]);

            length = 6;

          }

          break;

        default:

          abort ();

        }

    }

  else if ((iword & (1<<14)) == 0)

    {

      /* Extract the Form 2 opcode.  */

      opcode = &moxie_form2_opc_info[(iword >> 12) & 3];

      switch (opcode->itype)

        {

        case MOXIE_F2_A8V:

          fpr (stream, "%s\t%s, 0x%x",

               opcode->name,

               reg_names[(iword >> 8) & 0xf],

               iword & ((1 << 8) - 1));

          break;

        case MOXIE_F2_NARG:

          fpr (stream, "%s", opcode->name);

          break;

        default:

          abort();

        }

    }

  else

    {

      /* Extract the Form 3 opcode.  */

      opcode = &moxie_form3_opc_info[(iword >> 10) & 15];

      switch (opcode->itype)

        {

        case MOXIE_F3_PCREL:

          fpr (stream, "%s\t", opcode->name);

          info->print_address_func ((bfd_vma) (addr + INST2OFFSET(iword)),

                                    info);

          break;

        default:

          abort();

        }

    }

  return length;

 fail:

  info->memory_error_func (status, addr, info);

  return -1;

}