/* Disassemble MN10200 instructions.
  Copyright (C) 1996-2024 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 "sysdep.h"
#include <stdio.h>
#include "opcode/mn10200.h"
#include "disassemble.h"
#include "opintl.h"

static void
disassemble (bfd_vma memaddr,
            struct disassemble_info *info,
            unsigned long insn,
            unsigned long extension,
            unsigned int size)
{
 struct mn10200_opcode *op = (struct mn10200_opcode *)mn10200_opcodes;
 const struct mn10200_operand *operand;
 int match = 0;

 /* Find the opcode.  */
 while (op->name)
   {
     int mysize, extra_shift;

     if (op->format == FMT_1)
       mysize = 1;
     else if (op->format == FMT_2
              || op->format == FMT_4)
       mysize = 2;
     else if (op->format == FMT_3
              || op->format == FMT_5)
       mysize = 3;
     else if (op->format == FMT_6)
       mysize = 4;
     else if (op->format == FMT_7)
       mysize = 5;
     else
       abort ();

     if (op->format == FMT_2 || op->format == FMT_5)
       extra_shift = 8;
     else if (op->format == FMT_3
              || op->format == FMT_6
              || op->format == FMT_7)
       extra_shift = 16;
     else
       extra_shift = 0;

     if ((op->mask & insn) == op->opcode
         && size == (unsigned int) mysize)
       {
         const unsigned char *opindex_ptr;
         unsigned int nocomma;
         int paren = 0;

         match = 1;
         (*info->fprintf_func) (info->stream, "%s\t", op->name);

         /* Now print the operands.  */
         for (opindex_ptr = op->operands, nocomma = 1;
              *opindex_ptr != 0;
              opindex_ptr++)
           {
             unsigned long value;

             operand = &mn10200_operands[*opindex_ptr];

             if ((operand->flags & MN10200_OPERAND_DREG) != 0
                 || (operand->flags & MN10200_OPERAND_AREG) != 0)
               value = ((insn >> (operand->shift + extra_shift))
                        & ((1 << operand->bits) - 1));
             else if ((operand->flags & MN10200_OPERAND_EXTENDED) != 0)
               {
                 value = (insn & 0xffff) << 8;
                 value |= extension;
               }
             else
               value = ((insn >> (operand->shift))
                        & ((1L << operand->bits) - 1L));

             if ((operand->flags & MN10200_OPERAND_SIGNED) != 0)
               value = ((long)(value << (32 - operand->bits))
                         >> (32 - operand->bits));

             if (!nocomma
                 && (!paren
                     || ((operand->flags & MN10200_OPERAND_PAREN) == 0)))
               (*info->fprintf_func) (info->stream, ",");

             nocomma = 0;

             if ((operand->flags & MN10200_OPERAND_DREG) != 0)
               (*info->fprintf_func) (info->stream, "d%ld", value);

             else if ((operand->flags & MN10200_OPERAND_AREG) != 0)
               (*info->fprintf_func) (info->stream, "a%ld", value);

             else if ((operand->flags & MN10200_OPERAND_PSW) != 0)
               (*info->fprintf_func) (info->stream, "psw");

             else if ((operand->flags & MN10200_OPERAND_MDR) != 0)
               (*info->fprintf_func) (info->stream, "mdr");

             else if ((operand->flags & MN10200_OPERAND_PAREN) != 0)
               {
                 if (paren)
                   (*info->fprintf_func) (info->stream, ")");
                 else
                   {
                     (*info->fprintf_func) (info->stream, "(");
                     nocomma = 1;
                   }
                 paren = !paren;
               }

             else if ((operand->flags & MN10200_OPERAND_PCREL) != 0)
               (*info->print_address_func)
                 ((value + memaddr + mysize) & 0xffffff, info);

             else if ((operand->flags & MN10200_OPERAND_MEMADDR) != 0)
               (*info->print_address_func) (value, info);

             else
               (*info->fprintf_func) (info->stream, "%ld", value);
           }
         /* All done. */
         break;
       }
     op++;
   }

 if (!match)
   (*info->fprintf_func) (info->stream, _("unknown\t0x%04lx"), insn);
}

int
print_insn_mn10200 (bfd_vma memaddr, struct disassemble_info *info)
{
 int status;
 bfd_byte buffer[4];
 unsigned long insn;
 unsigned long extension = 0;
 unsigned int consume;

 /* First figure out how big the opcode is.  */
 status = (*info->read_memory_func) (memaddr, buffer, 1, info);
 if (status != 0)
   {
     (*info->memory_error_func) (status, memaddr, info);
     return -1;
   }

 insn = *(unsigned char *) buffer;

 /* These are one byte insns.  */
 if ((insn & 0xf0) == 0x00
     || (insn & 0xf0) == 0x10
     || (insn & 0xf0) == 0x20
     || (insn & 0xf0) == 0x30
     || ((insn & 0xf0) == 0x80
         && (insn & 0x0c) >> 2 != (insn & 0x03))
     || (insn & 0xf0) == 0x90
     || (insn & 0xf0) == 0xa0
     || (insn & 0xf0) == 0xb0
     || (insn & 0xff) == 0xeb
     || (insn & 0xff) == 0xf6
     || (insn & 0xff) == 0xfe
     || (insn & 0xff) == 0xff)
   {
     extension = 0;
     consume = 1;
   }

 /* These are two byte insns.  */
 else if ((insn & 0xf0) == 0x40
          || (insn & 0xf0) == 0x50
          || (insn & 0xf0) == 0x60
          || (insn & 0xf0) == 0x70
          || (insn & 0xf0) == 0x80
          || (insn & 0xfc) == 0xd0
          || (insn & 0xfc) == 0xd4
          || (insn & 0xfc) == 0xd8
          || (insn & 0xfc) == 0xe0
          || (insn & 0xfc) == 0xe4
          || (insn & 0xff) == 0xe8
          || (insn & 0xff) == 0xe9
          || (insn & 0xff) == 0xea
          || (insn & 0xff) == 0xf0
          || (insn & 0xff) == 0xf1
          || (insn & 0xff) == 0xf2
          || (insn & 0xff) == 0xf3)
   {
     status = (*info->read_memory_func) (memaddr, buffer, 2, info);
     if (status != 0)
       {
         (*info->memory_error_func) (status, memaddr, info);
          return -1;
       }
     insn = bfd_getb16 (buffer);
     consume = 2;
   }

 /* These are three byte insns with a 16bit operand in little
    endian form.  */
 else if ((insn & 0xf0) == 0xc0
          || (insn & 0xfc) == 0xdc
          || (insn & 0xfc) == 0xec
          || (insn & 0xff) == 0xf8
          || (insn & 0xff) == 0xf9
          || (insn & 0xff) == 0xfa
          || (insn & 0xff) == 0xfb
          || (insn & 0xff) == 0xfc
          || (insn & 0xff) == 0xfd)
   {
     status = (*info->read_memory_func) (memaddr + 1, buffer, 2, info);
     if (status != 0)
       {
         (*info->memory_error_func) (status, memaddr, info);
         return -1;
       }
     insn <<= 16;
     insn |= bfd_getl16 (buffer);
     extension = 0;
     consume = 3;
   }
 /* These are three byte insns too, but we don't have to mess with
    endianness stuff.  */
 else if ((insn & 0xff) == 0xf5)
   {
     status = (*info->read_memory_func) (memaddr + 1, buffer, 2, info);
     if (status != 0)
       {
         (*info->memory_error_func) (status, memaddr, info);
         return -1;
       }
     insn <<= 16;
     insn |= bfd_getb16 (buffer);
     extension = 0;
     consume = 3;
   }

 /* These are four byte insns.  */
 else if ((insn & 0xff) == 0xf7)
   {
     status = (*info->read_memory_func) (memaddr, buffer, 2, info);
     if (status != 0)
       {
         (*info->memory_error_func) (status, memaddr, info);
         return -1;
       }
     insn = bfd_getb16 (buffer);
     insn <<= 16;
     status = (*info->read_memory_func) (memaddr + 2, buffer, 2, info);
     if (status != 0)
       {
         (*info->memory_error_func) (status, memaddr, info);
         return -1;
       }
     insn |= bfd_getl16 (buffer);
     extension = 0;
     consume = 4;
   }

 /* These are five byte insns.  */
 else if ((insn & 0xff) == 0xf4)
   {
     status = (*info->read_memory_func) (memaddr, buffer, 2, info);
     if (status != 0)
       {
         (*info->memory_error_func) (status, memaddr, info);
         return -1;
       }
     insn = bfd_getb16 (buffer);
     insn <<= 16;

     status = (*info->read_memory_func) (memaddr + 4, buffer, 1, info);
     if (status != 0)
       {
         (*info->memory_error_func) (status, memaddr, info);
         return -1;
       }
     insn |= (*(unsigned char *)buffer << 8) & 0xff00;

     status = (*info->read_memory_func) (memaddr + 3, buffer, 1, info);
     if (status != 0)
       {
         (*info->memory_error_func) (status, memaddr, info);
         return -1;
       }
     insn |= (*(unsigned char *)buffer) & 0xff;

     status = (*info->read_memory_func) (memaddr + 2, buffer, 1, info);
     if (status != 0)
       {
         (*info->memory_error_func) (status, memaddr, info);
         return -1;
       }
     extension = (*(unsigned char *)buffer) & 0xff;
     consume = 5;
   }
 else
   {
     (*info->fprintf_func) (info->stream, _("unknown\t0x%02lx"), insn);
     return 1;
   }

 disassemble (memaddr, info, insn, extension, consume);

 return consume;
}

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