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

   Copyright (C) 1999-2025 Free Software Foundation, Inc.

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

   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 "sysdep.h"

#include <stdio.h>

#include "libiberty.h"

#include "opcode/pj.h"

#include "disassemble.h"

extern const pj_opc_info_t pj_opc_info[512];

static int

get_int (bfd_vma memaddr, int *iptr, struct disassemble_info *info)

{

  unsigned char ival[4];

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

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

     | (ival[1] << 16)

     | (ival[2] << 8)

     | (ival[3] << 0));

  return status;

}

int

print_insn_pj (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", pj_opc_info[opcode + byte_2].u.name);

      return 2;

    }

  else

    {

      char *sep = "\t";

      int insn_start = addr;

      const pj_opc_info_t *op = &pj_opc_info[opcode];

      unsigned int a;

      addr++;

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

      /* The tableswitch instruction is followed by the default

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

      if (strcmp (op->u.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->u.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; a < ARRAY_SIZE (op->arg) && 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 = ((unsigned) val << 8) | (data[i] & 0xff);

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

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

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

    else

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

    sep = ",";

    addr += size;

  }

      return op->len;

    }

 fail:

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

  return -1;

}