Subversion Repositories openrisc_2011-10-31

/* Disassemble SPU instructions

   Copyright 2006, 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 file; see the file COPYING.  If not, write to the

   Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, USA.  */

#include <stdio.h>

#include "sysdep.h"

#include "dis-asm.h"

#include "opcode/spu.h"

/* This file provides a disassembler function which uses

   the disassembler interface defined in dis-asm.h.   */

extern const struct spu_opcode spu_opcodes[];

extern const int spu_num_opcodes;

static const struct spu_opcode *spu_disassemble_table[(1<<11)];

static void

init_spu_disassemble (void)

{

  int i;

  /* If two instructions have the same opcode then we prefer the first

   * one.  In most cases it is just an alternate mnemonic. */

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

    {

      int o = spu_opcodes[i].opcode;

      if (o >= (1 << 11))

        abort ();

      if (spu_disassemble_table[o] == 0)

        spu_disassemble_table[o] = &spu_opcodes[i];

    }

}

/* Determine the instruction from the 10 least significant bits. */

static const struct spu_opcode *

get_index_for_opcode (unsigned int insn)

{

  const struct spu_opcode *index;

  unsigned int opcode = insn >> (32-11);

  /* Init the table.  This assumes that element 0/opcode 0 (currently

   * NOP) is always used */

  if (spu_disassemble_table[0] == 0)

    init_spu_disassemble ();

  if ((index = spu_disassemble_table[opcode & 0x780]) != 0

      && index->insn_type == RRR)

    return index;

  if ((index = spu_disassemble_table[opcode & 0x7f0]) != 0

      && (index->insn_type == RI18 || index->insn_type == LBT))

    return index;

  if ((index = spu_disassemble_table[opcode & 0x7f8]) != 0

      && index->insn_type == RI10)

    return index;

  if ((index = spu_disassemble_table[opcode & 0x7fc]) != 0

      && (index->insn_type == RI16))

    return index;

  if ((index = spu_disassemble_table[opcode & 0x7fe]) != 0

      && (index->insn_type == RI8))

    return index;

  if ((index = spu_disassemble_table[opcode & 0x7ff]) != 0)

    return index;

  return 0;

}

/* Print a Spu instruction.  */

int

print_insn_spu (bfd_vma memaddr, struct disassemble_info *info)

{

  bfd_byte buffer[4];

  int value;

  int hex_value;

  int status;

  unsigned int insn;

  const struct spu_opcode *index;

  enum spu_insns tag;

  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);

  index = get_index_for_opcode (insn);

  if (index == 0)

    {

      (*info->fprintf_func) (info->stream, ".long 0x%x", insn);

    }

  else

    {

      int i;

      int paren = 0;

      tag = (enum spu_insns)(index - spu_opcodes);

      (*info->fprintf_func) (info->stream, "%s", index->mnemonic);

      if (tag == M_BI || tag == M_BISL || tag == M_IRET || tag == M_BISLED

          || tag == M_BIHNZ || tag == M_BIHZ || tag == M_BINZ || tag == M_BIZ

          || tag == M_SYNC || tag == M_HBR)

        {

          int fb = (insn >> (32-18)) & 0x7f;

          if (fb & 0x40)

            (*info->fprintf_func) (info->stream, tag == M_SYNC ? "c" : "p");

          if (fb & 0x20)

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

          if (fb & 0x10)

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

        }

      if (index->arg[0] != 0)

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

      hex_value = 0;

      for (i = 1;  i <= index->arg[0]; i++)

        {

          int arg = index->arg[i];

          if (arg != A_P && !paren && i > 1)

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

          switch (arg)

            {

            case A_T:

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

                                     DECODE_INSN_RT (insn));

              break;

            case A_A:

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

                                     DECODE_INSN_RA (insn));

              break;

            case A_B:

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

                                     DECODE_INSN_RB (insn));

              break;

            case A_C:

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

                                     DECODE_INSN_RC (insn));

              break;

            case A_S:

              (*info->fprintf_func) (info->stream, "$sp%d",

                                     DECODE_INSN_RA (insn));

              break;

            case A_H:

              (*info->fprintf_func) (info->stream, "$ch%d",

                                     DECODE_INSN_RA (insn));

              break;

            case A_P:

              paren++;

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

              break;

            case A_U7A:

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

                                     173 - DECODE_INSN_U8 (insn));

              break;

            case A_U7B:

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

                                     155 - DECODE_INSN_U8 (insn));

              break;

            case A_S3:

            case A_S6:

            case A_S7:

            case A_S7N:

            case A_U3:

            case A_U5:

            case A_U6:

            case A_U7:

              hex_value = DECODE_INSN_I7 (insn);

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

              break;

            case A_S11:

              (*info->print_address_func) (memaddr + DECODE_INSN_I9a (insn) * 4,

                                           info);

              break;

            case A_S11I:

              (*info->print_address_func) (memaddr + DECODE_INSN_I9b (insn) * 4,

                                           info);

              break;

            case A_S10:

            case A_S10B:

              hex_value = DECODE_INSN_I10 (insn);

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

              break;

            case A_S14:

              hex_value = DECODE_INSN_I10 (insn) * 16;

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

              break;

            case A_S16:

              hex_value = DECODE_INSN_I16 (insn);

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

              break;

            case A_X16:

              hex_value = DECODE_INSN_U16 (insn);

              (*info->fprintf_func) (info->stream, "%u", hex_value);

              break;

            case A_R18:

              value = DECODE_INSN_I16 (insn) * 4;

              if (value == 0)

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

              else

                {

                  hex_value = memaddr + value;

                  (*info->print_address_func) (hex_value & 0x3ffff, info);

                }

              break;

            case A_S18:

              value = DECODE_INSN_U16 (insn) * 4;

              if (value == 0)

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

              else

                (*info->print_address_func) (value, info);

              break;

            case A_U18:

              value = DECODE_INSN_U18 (insn);

              if (value == 0 || !(*info->symbol_at_address_func)(0, info))

                {

                  hex_value = value;

                  (*info->fprintf_func) (info->stream, "%u", value);

                }

              else

                (*info->print_address_func) (value, info);

              break;

            case A_U14:

              hex_value = DECODE_INSN_U14 (insn);

              (*info->fprintf_func) (info->stream, "%u", hex_value);

              break;

            }

          if (arg != A_P && paren)

            {

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

              paren--;

            }

        }

      if (hex_value > 16)

        (*info->fprintf_func) (info->stream, "\t# %x", hex_value);

    }

  return 4;

}