opcodes/ft32-dis.c

   1 /* Disassemble ft32 instructions.
   2    Copyright (C) 2013-2017 Free Software Foundation, Inc.
   3    Contributed by FTDI (support@ftdichip.com)
   4
   5    This file is part of the GNU opcodes library.
   6
   7    This library is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    It is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include <stdio.h>
  24 #define STATIC_TABLE
  25 #define DEFINE_TABLE
  26
  27 #include "opcode/ft32.h"
  28 #include "disassemble.h"
  29
  30 extern const ft32_opc_info_t ft32_opc_info[128];
  31
  32 static fprintf_ftype fpr;
  33 static void *stream;
  34
  35 static int
  36 sign_extend(int bit, int value)
  37 {
  38   int onebit = (1 << bit);
  39   return (value & (onebit - 1)) - (value & onebit);
  40 }
  41
  42 int
  43 print_insn_ft32 (bfd_vma addr, struct disassemble_info *info)
  44 {
  45   int status;
  46   stream = info->stream;
  47   bfd_byte buffer[4];
  48   unsigned int iword;
  49   const ft32_opc_info_t *oo;
  50
  51   fpr = info->fprintf_func;
  52
  53   if ((status = info->read_memory_func (addr, buffer, 4, info)))
  54     goto fail;
  55
  56   iword = bfd_getl32 (buffer);
  57
  58   for (oo = ft32_opc_info; oo->name; oo++)
  59     if ((iword & oo->mask) == oo->bits)
  60       break;
  61
  62   if (oo->name)
  63     {
  64       int f = oo->fields;
  65       int imm;
  66
  67       fpr (stream, "%08x %s", iword, oo->name);
  68       if (oo->dw)
  69         {
  70           fpr (stream, ".%c ", "bsl"[(iword >> FT32_FLD_DW_BIT) & 3]);
  71         }
  72       else
  73         {
  74           fpr (stream, " ");
  75         }
  76
  77       while (f)
  78         {
  79           int lobit = f & -f;
  80           if (f & lobit)
  81             {
  82               switch (lobit)
  83               {
  84               case  FT32_FLD_CBCRCV:
  85                 // imm is {CB, CV}
  86                 imm = ((iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1)) << 4;
  87                 imm |= ((iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1));
  88                 switch (imm)
  89                 {
  90                 case 0x00: fpr(stream, "nz");  break;
  91                 case 0x01: fpr(stream, "z");   break;
  92                 case 0x10: fpr(stream, "ae");  break;
  93                 case 0x11: fpr(stream, "b");   break;
  94                 case 0x20: fpr(stream, "no");  break;
  95                 case 0x21: fpr(stream, "o");   break;
  96                 case 0x30: fpr(stream, "ns");  break;
  97                 case 0x31: fpr(stream, "s");   break;
  98                 case 0x40: fpr(stream, "lt");  break;
  99                 case 0x41: fpr(stream, "gte"); break;
 100                 case 0x50: fpr(stream, "lte"); break;
 101                 case 0x51: fpr(stream, "gt");  break;
 102                 case 0x60: fpr(stream, "be");  break;
 103                 case 0x61: fpr(stream, "a");   break;
 104                 default:   fpr(stream, "%d,$r30,%d", (imm >> 4), (imm & 1)); break;
 105                 }
 106                 break;
 107               case  FT32_FLD_CB:
 108                 imm = (iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1);
 109                 fpr(stream, "%d", imm);
 110                 break;
 111               case  FT32_FLD_R_D:
 112                 fpr(stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f);
 113                 break;
 114               case  FT32_FLD_CR:
 115                 imm = (iword >> FT32_FLD_CR_BIT) & ((1 << FT32_FLD_CR_SIZ) - 1);
 116                 fpr(stream, "$r%d", 28 + imm);
 117                 break;
 118               case  FT32_FLD_CV:
 119                 imm = (iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1);
 120                 fpr(stream, "%d", imm);
 121                 break;
 122               case  FT32_FLD_R_1:
 123                 fpr(stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f);
 124                 break;
 125               case  FT32_FLD_RIMM:
 126                 imm = (iword >> FT32_FLD_RIMM_BIT) & ((1 << FT32_FLD_RIMM_SIZ) - 1);
 127                 if (imm & 0x400)
 128                   fpr(stream, "%d", sign_extend(9, imm));
 129                 else
 130                   fpr(stream, "$r%d", imm & 0x1f);
 131                 break;
 132               case  FT32_FLD_R_2:
 133                 fpr(stream, "$r%d", (iword >> FT32_FLD_R_2_BIT) & 0x1f);
 134                 break;
 135               case  FT32_FLD_K20:
 136                 imm = iword & ((1 << FT32_FLD_K20_SIZ) - 1);
 137                 fpr(stream, "%d", sign_extend(19, imm));
 138                 break;
 139               case  FT32_FLD_PA:
 140                 imm = (iword & ((1 << FT32_FLD_PA_SIZ) - 1)) << 2;
 141                 info->print_address_func ((bfd_vma) imm, info);
 142                 break;
 143               case  FT32_FLD_AA:
 144                 imm = iword & ((1 << FT32_FLD_AA_SIZ) - 1);
 145                 info->print_address_func ((1 << 23) | (bfd_vma) imm, info);
 146                 break;
 147               case  FT32_FLD_K16:
 148                 imm = iword & ((1 << FT32_FLD_K16_SIZ) - 1);
 149                 fpr(stream, "%d", imm);
 150                 break;
 151               case  FT32_FLD_K8:
 152                 imm = iword & ((1 << FT32_FLD_K8_SIZ) - 1);
 153                 fpr(stream, "%d", sign_extend(7, imm));
 154                 break;
 155               case  FT32_FLD_R_D_POST:
 156                 fpr(stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f);
 157                 break;
 158               case  FT32_FLD_R_1_POST:
 159                 fpr(stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f);
 160                 break;
 161               default:
 162                 break;
 163               }
 164               f &= ~lobit;
 165               if (f)
 166                 {
 167                   fpr(stream, ",");
 168                 }
 169             }
 170         }
 171     }
 172     else
 173     {
 174       fpr (stream, "%08x!", iword);
 175     }
 176
 177   return 4;
 178
 179  fail:
 180   info->memory_error_func (status, addr, info);
 181   return -1;
 182 }