opcodes/ft32-dis.c

   1 /* Disassemble ft32 instructions.
   2    Copyright (C) 2013-2024 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[];
  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_opcode1 (unsigned int iword,
  44               struct disassemble_info *info)
  45 {
  46   const ft32_opc_info_t *oo;
  47
  48   for (oo = ft32_opc_info; oo->name; oo++)
  49     if ((iword & oo->mask) == oo->bits)
  50       break;
  51
  52   if (oo->name)
  53     {
  54       int f = oo->fields;
  55       int imm;
  56
  57       fpr (stream, "%s", oo->name);
  58       if (oo->dw)
  59         fpr (stream, ".%c ", "bsl"[(iword >> FT32_FLD_DW_BIT) & 3]);
  60       else
  61         fpr (stream, " ");
  62
  63       while (f)
  64         {
  65           int lobit = f & -f;
  66           if (f & lobit)
  67             {
  68               switch (lobit)
  69                 {
  70                 case  FT32_FLD_CBCRCV:
  71                   /* imm is {CB, CV}  */
  72                   imm = ((iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1)) << 4;
  73                   imm |= ((iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1));
  74                   switch (imm)
  75                     {
  76                     case 0x00: fpr (stream, "nz");  break;
  77                     case 0x01: fpr (stream, "z");   break;
  78                     case 0x10: fpr (stream, "ae");  break;
  79                     case 0x11: fpr (stream, "b");   break;
  80                     case 0x20: fpr (stream, "no");  break;
  81                     case 0x21: fpr (stream, "o");   break;
  82                     case 0x30: fpr (stream, "ns");  break;
  83                     case 0x31: fpr (stream, "s");   break;
  84                     case 0x40: fpr (stream, "lt");  break;
  85                     case 0x41: fpr (stream, "gte"); break;
  86                     case 0x50: fpr (stream, "lte"); break;
  87                     case 0x51: fpr (stream, "gt");  break;
  88                     case 0x60: fpr (stream, "be");  break;
  89                     case 0x61: fpr (stream, "a");   break;
  90                     default:
  91                       fpr (stream, "%d,$r30,%d", (imm >> 4), (imm & 1));
  92                       break;
  93                     }
  94                   break;
  95                 case  FT32_FLD_CB:
  96                   imm = (iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1);
  97                   fpr (stream, "%d", imm);
  98                   break;
  99                 case  FT32_FLD_R_D:
 100                   fpr (stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f);
 101                   break;
 102                 case  FT32_FLD_CR:
 103                   imm = (iword >> FT32_FLD_CR_BIT) & ((1 << FT32_FLD_CR_SIZ) - 1);
 104                   fpr (stream, "$r%d", 28 + imm);
 105                   break;
 106                 case  FT32_FLD_CV:
 107                   imm = (iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1);
 108                   fpr (stream, "%d", imm);
 109                   break;
 110                 case  FT32_FLD_R_1:
 111                   fpr (stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f);
 112                   break;
 113                 case  FT32_FLD_RIMM:
 114                   imm = (iword >> FT32_FLD_RIMM_BIT) & ((1 << FT32_FLD_RIMM_SIZ) - 1);
 115                   if (imm & 0x400)
 116                     fpr (stream, "%d", sign_extend (9, imm));
 117                   else
 118                     fpr (stream, "$r%d", imm & 0x1f);
 119                   break;
 120                 case  FT32_FLD_R_2:
 121                   fpr (stream, "$r%d", (iword >> FT32_FLD_R_2_BIT) & 0x1f);
 122                   break;
 123                 case  FT32_FLD_K20:
 124                   imm = iword & ((1 << FT32_FLD_K20_SIZ) - 1);
 125                   fpr (stream, "%d", sign_extend (19, imm));
 126                   break;
 127                 case  FT32_FLD_PA:
 128                   imm = (iword & ((1 << FT32_FLD_PA_SIZ) - 1)) << 2;
 129                   info->print_address_func ((bfd_vma) imm, info);
 130                   break;
 131                 case  FT32_FLD_AA:
 132                   imm = iword & ((1 << FT32_FLD_AA_SIZ) - 1);
 133                   info->print_address_func ((1 << 23) | (bfd_vma) imm, info);
 134                   break;
 135                 case  FT32_FLD_K16:
 136                   imm = iword & ((1 << FT32_FLD_K16_SIZ) - 1);
 137                   fpr (stream, "%d", imm);
 138                   break;
 139                 case  FT32_FLD_K15:
 140                   imm = iword & ((1 << FT32_FLD_K15_SIZ) - 1);
 141                   fpr (stream, "%d", sign_extend (14, imm));
 142                   break;
 143                 case  FT32_FLD_R_D_POST:
 144                   fpr (stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f);
 145                   break;
 146                 case  FT32_FLD_R_1_POST:
 147                   fpr (stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f);
 148                   break;
 149                 default:
 150                   break;
 151                 }
 152               f &= ~lobit;
 153               if (f)
 154                 fpr (stream, ",");
 155             }
 156         }
 157     }
 158   else
 159     fpr (stream, "!");
 160 }
 161
 162 static void
 163 ft32_opcode (bfd_vma addr ATTRIBUTE_UNUSED,
 164              unsigned int iword,
 165              struct disassemble_info *info)
 166 {
 167   unsigned int sc[2];
 168   if (ft32_decode_shortcode ((unsigned int) addr, iword, sc))
 169     {
 170       ft32_opcode1 (sc[0], info);
 171       fpr (stream, " ; ");
 172       ft32_opcode1 (sc[1], info);
 173     }
 174   else
 175     ft32_opcode1 (iword, info);
 176 }
 177
 178 int
 179 print_insn_ft32 (bfd_vma addr, struct disassemble_info *info)
 180 {
 181   int status;
 182   stream = info->stream;
 183   bfd_byte buffer[4];
 184   unsigned int iword;
 185
 186   fpr = info->fprintf_func;
 187
 188   if ((status = info->read_memory_func (addr, buffer, 4, info)))
 189     goto fail;
 190
 191   iword = bfd_getl32 (buffer);
 192
 193   fpr (stream, "%08x ", iword);
 194
 195   ft32_opcode (addr, iword, info);
 196
 197   return 4;
 198
 199  fail:
 200   info->memory_error_func (status, addr, info);
 201   return -1;
 202 }