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/* pj-dis.c -- Disassemble picoJava instructions.

   Copyright 1999, 2000 Free Software Foundation, Inc.

   Contributed by Steve Chamberlain, of Transmeta (sac@pobox.com).

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/pj.h"

#include "dis-asm.h"

extern const pj_opc_info_t pj_opc_info[512];

static int get_int (memaddr, iptr, info)

     bfd_vma memaddr;

     int *iptr;

     struct disassemble_info *info;

{

  unsigned char ival[4];

  int status = info->read_memory_func (memaddr, ival, 4, info);

  *iptr = (ival[0] << 24)

    | (ival[1] << 16)

    | (ival[2] << 8)

    | (ival[3] << 0) ;

  return status;

}

int

print_insn_pj (addr, info)

     bfd_vma addr;

     struct disassemble_info *info;

{

  fprintf_ftype fprintf_fn = info->fprintf_func;

  void *stream = info->stream;

  unsigned char opcode;

  int status;

  if ((status = info->read_memory_func (addr, &opcode, 1, info)))

    goto fail;

  if (opcode == 0xff)

    {

      unsigned char byte_2;

      if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info)))

        goto fail;

      fprintf_fn (stream, "%s\t", pj_opc_info[opcode + byte_2].name);

      return 2;

    }

  else

    {

      char *sep = "\t";

      int insn_start = addr;

      const pj_opc_info_t *op = &pj_opc_info[opcode];

      int a;

      addr++;

      fprintf_fn (stream, "%s", op->name);

      /* The tableswitch instruction is followed by the default

         address, low value, high value and the destinations. */

      if (strcmp (op->name, "tableswitch") == 0)

        {

          int lowval;

          int highval;

          int val;

          addr = (addr + 3) & ~3;

          if ((status = get_int (addr, &val, info)))

            goto fail;

          fprintf_fn (stream," default: ");

          (*info->print_address_func) (val + insn_start, info);

          addr += 4;

          if ((status = get_int (addr, &lowval, info)))

            goto fail;

          addr += 4;

          if ((status = get_int (addr, &highval, info)))

            goto fail;

          addr += 4;

          while (lowval <= highval) {

            if ((status = get_int (addr, &val, info)))

              goto fail;

            fprintf_fn (stream," %d:[", lowval);

            (*info->print_address_func) (val + insn_start, info);

            fprintf_fn (stream," ]");

            addr += 4;

            lowval++;

          }

          return addr - insn_start;

        }

      /* The lookupswitch instruction is followed by the default

         address, element count and pairs of values and

         addresses. */

      if (strcmp (op->name, "lookupswitch") == 0)

        {

          int count;

          int val;

          addr = (addr + 3) & ~3;

          if ((status = get_int (addr, &val, info)))

            goto fail;

          addr += 4;

          fprintf_fn (stream," default: ");

          (*info->print_address_func) (val + insn_start, info);

          if ((status = get_int (addr, &count, info)))

            goto fail;

          addr += 4;

          while (count--) {

            if ((status = get_int (addr, &val, info)))

              goto fail;

            addr += 4;

            fprintf_fn (stream," %d:[", val);

            if ((status = get_int (addr, &val, info)))

              goto fail;

            addr += 4;

            (*info->print_address_func) (val + insn_start, info);

            fprintf_fn (stream," ]");

          }

          return addr - insn_start;

        }

      for (a = 0; op->arg[a]; a++)

        {

          unsigned char data[4];

          int val = 0;

          int i;

          int size = ASIZE (op->arg[a]);

          if ((status = info->read_memory_func (addr, data, size, info)))

            goto fail;

          val = (UNS (op->arg[0]) || ((data[0] & 0x80) == 0)) ? 0 : -1;

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

            val = (val << 8) | (data[i] & 0xff);

          if (PCREL (op->arg[a]))

            (*info->print_address_func) (val + insn_start, info);

          else

            fprintf_fn (stream, "%s%d", sep, val);

          sep = ",";

          addr += size;

        }

      return op->len;

    }

 fail:

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

  return -1;

}