/* Disassemble ft32 instructions.
  Copyright (C) 2013-2024 Free Software Foundation, Inc.
  Contributed by FTDI ([email protected])

  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/ft32.h"
#include "disassemble.h"

extern const ft32_opc_info_t ft32_opc_info[];

static fprintf_ftype fpr;
static void *stream;

static int
sign_extend (int bit, int value)
{
 int onebit = (1 << bit);
 return (value & (onebit - 1)) - (value & onebit);
}

static void
ft32_opcode1 (unsigned int iword,
             struct disassemble_info *info)
{
 const ft32_opc_info_t *oo;

 for (oo = ft32_opc_info; oo->name; oo++)
   if ((iword & oo->mask) == oo->bits)
     break;

 if (oo->name)
   {
     int f = oo->fields;
     int imm;

     fpr (stream, "%s", oo->name);
     if (oo->dw)
       fpr (stream, ".%c ", "bsl"[(iword >> FT32_FLD_DW_BIT) & 3]);
     else
       fpr (stream, " ");

     while (f)
       {
         int lobit = f & -f;
         if (f & lobit)
           {
             switch (lobit)
               {
               case  FT32_FLD_CBCRCV:
                 /* imm is {CB, CV}  */
                 imm = ((iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1)) << 4;
                 imm |= ((iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1));
                 switch (imm)
                   {
                   case 0x00: fpr (stream, "nz");  break;
                   case 0x01: fpr (stream, "z");   break;
                   case 0x10: fpr (stream, "ae");  break;
                   case 0x11: fpr (stream, "b");   break;
                   case 0x20: fpr (stream, "no");  break;
                   case 0x21: fpr (stream, "o");   break;
                   case 0x30: fpr (stream, "ns");  break;
                   case 0x31: fpr (stream, "s");   break;
                   case 0x40: fpr (stream, "lt");  break;
                   case 0x41: fpr (stream, "gte"); break;
                   case 0x50: fpr (stream, "lte"); break;
                   case 0x51: fpr (stream, "gt");  break;
                   case 0x60: fpr (stream, "be");  break;
                   case 0x61: fpr (stream, "a");   break;
                   default:
                     fpr (stream, "%d,$r30,%d", (imm >> 4), (imm & 1));
                     break;
                   }
                 break;
               case  FT32_FLD_CB:
                 imm = (iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1);
                 fpr (stream, "%d", imm);
                 break;
               case  FT32_FLD_R_D:
                 fpr (stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f);
                 break;
               case  FT32_FLD_CR:
                 imm = (iword >> FT32_FLD_CR_BIT) & ((1 << FT32_FLD_CR_SIZ) - 1);
                 fpr (stream, "$r%d", 28 + imm);
                 break;
               case  FT32_FLD_CV:
                 imm = (iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1);
                 fpr (stream, "%d", imm);
                 break;
               case  FT32_FLD_R_1:
                 fpr (stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f);
                 break;
               case  FT32_FLD_RIMM:
                 imm = (iword >> FT32_FLD_RIMM_BIT) & ((1 << FT32_FLD_RIMM_SIZ) - 1);
                 if (imm & 0x400)
                   fpr (stream, "%d", sign_extend (9, imm));
                 else
                   fpr (stream, "$r%d", imm & 0x1f);
                 break;
               case  FT32_FLD_R_2:
                 fpr (stream, "$r%d", (iword >> FT32_FLD_R_2_BIT) & 0x1f);
                 break;
               case  FT32_FLD_K20:
                 imm = iword & ((1 << FT32_FLD_K20_SIZ) - 1);
                 fpr (stream, "%d", sign_extend (19, imm));
                 break;
               case  FT32_FLD_PA:
                 imm = (iword & ((1 << FT32_FLD_PA_SIZ) - 1)) << 2;
                 info->print_address_func ((bfd_vma) imm, info);
                 break;
               case  FT32_FLD_AA:
                 imm = iword & ((1 << FT32_FLD_AA_SIZ) - 1);
                 info->print_address_func ((1 << 23) | (bfd_vma) imm, info);
                 break;
               case  FT32_FLD_K16:
                 imm = iword & ((1 << FT32_FLD_K16_SIZ) - 1);
                 fpr (stream, "%d", imm);
                 break;
               case  FT32_FLD_K15:
                 imm = iword & ((1 << FT32_FLD_K15_SIZ) - 1);
                 fpr (stream, "%d", sign_extend (14, imm));
                 break;
               case  FT32_FLD_R_D_POST:
                 fpr (stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f);
                 break;
               case  FT32_FLD_R_1_POST:
                 fpr (stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f);
                 break;
               default:
                 break;
               }
             f &= ~lobit;
             if (f)
               fpr (stream, ",");
           }
       }
   }
 else
   fpr (stream, "!");
}

static void
ft32_opcode (bfd_vma addr ATTRIBUTE_UNUSED,
            unsigned int iword,
            struct disassemble_info *info)
{
 unsigned int sc[2];
 if (ft32_decode_shortcode ((unsigned int) addr, iword, sc))
   {
     ft32_opcode1 (sc[0], info);
     fpr (stream, " ; ");
     ft32_opcode1 (sc[1], info);
   }
 else
   ft32_opcode1 (iword, info);
}

int
print_insn_ft32 (bfd_vma addr, struct disassemble_info *info)
{
 int status;
 stream = info->stream;
 bfd_byte buffer[4];
 unsigned int iword;

 fpr = info->fprintf_func;

 if ((status = info->read_memory_func (addr, buffer, 4, info)))
   goto fail;

 iword = bfd_getl32 (buffer);

 fpr (stream, "%08x ", iword);

 ft32_opcode (addr, iword, info);

 return 4;

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

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