/* Disassemble moxie instructions.
  Copyright (C) 2009-2024 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>

#define STATIC_TABLE
#define DEFINE_TABLE

#include "opcode/moxie.h"
#include "disassemble.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) (((((o) & 0x3ff) ^ 0x200) - 0x200) * 2)

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;

 if (info->endian == BFD_ENDIAN_BIG)
   iword = bfd_getb16 (buffer);
 else
   iword = bfd_getl16 (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;
           if (info->endian == BFD_ENDIAN_BIG)
             imm = bfd_getb32 (buffer);
           else
             imm = bfd_getl32 (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;
           if (info->endian == BFD_ENDIAN_BIG)
             imm = bfd_getb32 (buffer);
           else
             imm = bfd_getl32 (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;
           if (info->endian == BFD_ENDIAN_BIG)
             imm = bfd_getb32 (buffer);
           else
             imm = bfd_getl32 (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;
           if (info->endian == BFD_ENDIAN_BIG)
             imm = bfd_getb32 (buffer);
           else
             imm = bfd_getl32 (buffer);
           fpr (stream, "%s\t0x%x, %s",
                opcode->name, imm, reg_names[OP_A(iword)]);
           length = 6;
         }
         break;
       case MOXIE_F1_AiB2:
         {
           unsigned imm;
           if ((status = info->read_memory_func (addr+2, buffer, 2, info)))
             goto fail;
           if (info->endian == BFD_ENDIAN_BIG)
             imm = bfd_getb16 (buffer);
           else
             imm = bfd_getl16 (buffer);
           fpr (stream, "%s\t0x%x(%s), %s", opcode->name,
                imm,
                reg_names[OP_A(iword)],
                reg_names[OP_B(iword)]);
           length = 4;
         }
         break;
       case MOXIE_F1_ABi2:
         {
           unsigned imm;
           if ((status = info->read_memory_func (addr+2, buffer, 2, info)))
             goto fail;
           if (info->endian == BFD_ENDIAN_BIG)
             imm = bfd_getb16 (buffer);
           else
             imm = bfd_getl16 (buffer);
           fpr (stream, "%s\t%s, 0x%x(%s)",
                opcode->name,
                reg_names[OP_A(iword)],
                imm,
                reg_names[OP_B(iword)]);
           length = 4;
         }
         break;
       case MOXIE_BAD:
         fpr (stream, "bad");
         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;
       case MOXIE_BAD:
         fpr (stream, "bad");
         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 (addr + INST2OFFSET (iword) + 2, info);
         break;
       case MOXIE_BAD:
         fpr (stream, "bad");
         break;
       default:
         abort();
       }
   }

 return length;

fail:
 info->memory_error_func (status, addr, info);
 return -1;
}

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