opcodes/ft32-dis.c

   1 /* Disassemble ft32 instructions.
   2    Copyright (C) 2013-2020 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 static void
  43 ft32_opcode(bfd_vma addr ATTRIBUTE_UNUSED,
  44             unsigned int iword,
  45             struct disassemble_info *info)
  46 {
  47   const ft32_opc_info_t *oo;
  48
  49   for (oo = ft32_opc_info; oo->name; oo++)
  50     if ((iword & oo->mask) == oo->bits)
  51       break;
  52
  53   unsigned int sc[2];
  54   if (ft32_decode_shortcode((unsigned int)addr, iword, sc))
  55     {
  56       ft32_opcode(addr, sc[0], info);
  57       fpr (stream, " ; ");
  58       ft32_opcode(addr, sc[1], info);
  59     }
  60
  61   if (oo->name)
  62     {
  63       int f = oo->fields;
  64       int imm;
  65
  66       fpr (stream, "%s", oo->name);
  67       if (oo->dw)
  68         {
  69           fpr (stream, ".%c ", "bsl"[(iword >> FT32_FLD_DW_BIT) & 3]);
  70         }
  71       else
  72         {
  73           fpr (stream, " ");
  74         }
  75
  76       while (f)
  77         {
  78           int lobit = f & -f;
  79           if (f & lobit)
  80             {
  81               switch (lobit)
  82               {
  83               case  FT32_FLD_CBCRCV:
  84                 // imm is {CB, CV}
  85                 imm = ((iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1)) << 4;
  86                 imm |= ((iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1));
  87                 switch (imm)
  88                 {
  89                 case 0x00: fpr(stream, "nz");  break;
  90                 case 0x01: fpr(stream, "z");   break;
  91                 case 0x10: fpr(stream, "ae");  break;
  92                 case 0x11: fpr(stream, "b");   break;
  93                 case 0x20: fpr(stream, "no");  break;
  94                 case 0x21: fpr(stream, "o");   break;
  95                 case 0x30: fpr(stream, "ns");  break;
  96                 case 0x31: fpr(stream, "s");   break;
  97                 case 0x40: fpr(stream, "lt");  break;
  98                 case 0x41: fpr(stream, "gte"); break;
  99                 case 0x50: fpr(stream, "lte"); break;
 100                 case 0x51: fpr(stream, "gt");  break;
 101                 case 0x60: fpr(stream, "be");  break;
 102                 case 0x61: fpr(stream, "a");   break;
 103                 default:   fpr(stream, "%d,$r30,%d", (imm >> 4), (imm & 1)); break;
 104                 }
 105                 break;
 106               case  FT32_FLD_CB:
 107                 imm = (iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1);
 108                 fpr(stream, "%d", imm);
 109                 break;
 110               case  FT32_FLD_R_D:
 111                 fpr(stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f);
 112                 break;
 113               case  FT32_FLD_CR:
 114                 imm = (iword >> FT32_FLD_CR_BIT) & ((1 << FT32_FLD_CR_SIZ) - 1);
 115                 fpr(stream, "$r%d", 28 + imm);
 116                 break;
 117               case  FT32_FLD_CV:
 118                 imm = (iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1);
 119                 fpr(stream, "%d", imm);
 120                 break;
 121               case  FT32_FLD_R_1:
 122                 fpr(stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f);
 123                 break;
 124               case  FT32_FLD_RIMM:
 125                 imm = (iword >> FT32_FLD_RIMM_BIT) & ((1 << FT32_FLD_RIMM_SIZ) - 1);
 126                 if (imm & 0x400)
 127                   fpr(stream, "%d", sign_extend(9, imm));
 128                 else
 129                   fpr(stream, "$r%d", imm & 0x1f);
 130                 break;
 131               case  FT32_FLD_R_2:
 132                 fpr(stream, "$r%d", (iword >> FT32_FLD_R_2_BIT) & 0x1f);
 133                 break;
 134               case  FT32_FLD_K20:
 135                 imm = iword & ((1 << FT32_FLD_K20_SIZ) - 1);
 136                 fpr(stream, "%d", sign_extend(19, imm));
 137                 break;
 138               case  FT32_FLD_PA:
 139                 imm = (iword & ((1 << FT32_FLD_PA_SIZ) - 1)) << 2;
 140                 info->print_address_func ((bfd_vma) imm, info);
 141                 break;
 142               case  FT32_FLD_AA:
 143                 imm = iword & ((1 << FT32_FLD_AA_SIZ) - 1);
 144                 info->print_address_func ((1 << 23) | (bfd_vma) imm, info);
 145                 break;
 146               case  FT32_FLD_K16:
 147                 imm = iword & ((1 << FT32_FLD_K16_SIZ) - 1);
 148                 fpr(stream, "%d", imm);
 149                 break;
 150               case  FT32_FLD_K15:
 151                 imm = iword & ((1 << FT32_FLD_K15_SIZ) - 1);
 152                 fpr(stream, "%d", sign_extend(14, imm));
 153                 break;
 154               case  FT32_FLD_R_D_POST:
 155                 fpr(stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f);
 156                 break;
 157               case  FT32_FLD_R_1_POST:
 158                 fpr(stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f);
 159                 break;
 160               default:
 161                 break;
 162               }
 163               f &= ~lobit;
 164               if (f)
 165                 {
 166                   fpr(stream, ",");
 167                 }
 168             }
 169         }
 170     }
 171     else
 172     {
 173       fpr (stream, "!");
 174     }
 175 }
 176
 177 int
 178 print_insn_ft32 (bfd_vma addr, struct disassemble_info *info)
 179 {
 180   int status;
 181   stream = info->stream;
 182   bfd_byte buffer[4];
 183   unsigned int iword;
 184
 185   fpr = info->fprintf_func;
 186
 187   if ((status = info->read_memory_func (addr, buffer, 4, info)))
 188     goto fail;
 189
 190   iword = bfd_getl32 (buffer);
 191
 192   fpr (stream, "%08x ", iword);
 193
 194   ft32_opcode(addr, iword, info);
 195
 196   return 4;
 197
 198  fail:
 199   info->memory_error_func (status, addr, info);
 200   return -1;
 201 }