opcodes/moxie-dis.c

   1 /* Disassemble moxie instructions.
   2    Copyright (C) 2009-2021 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU opcodes library.
   5
   6    This library is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    It is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include <stdio.h>
  23
  24 #define STATIC_TABLE
  25 #define DEFINE_TABLE
  26
  27 #include "opcode/moxie.h"
  28 #include "disassemble.h"
  29
  30 static fprintf_ftype fpr;
  31 static void *stream;
  32
  33 /* Macros to extract operands from the instruction word.  */
  34 #define OP_A(i) ((i >> 4) & 0xf)
  35 #define OP_B(i) (i & 0xf)
  36 #define INST2OFFSET(o) (((((o) & 0x3ff) ^ 0x200) - 0x200) * 2)
  37
  38 static const char * reg_names[16] =
  39   { "$fp", "$sp", "$r0", "$r1", "$r2", "$r3", "$r4", "$r5",
  40     "$r6", "$r7", "$r8", "$r9", "$r10", "$r11", "$r12", "$r13" };
  41
  42 int
  43 print_insn_moxie (bfd_vma addr, struct disassemble_info * info)
  44 {
  45   int length = 2;
  46   int status;
  47   stream = info->stream;
  48   const moxie_opc_info_t * opcode;
  49   bfd_byte buffer[4];
  50   unsigned short iword;
  51   fpr = info->fprintf_func;
  52
  53   if ((status = info->read_memory_func (addr, buffer, 2, info)))
  54     goto fail;
  55
  56   if (info->endian == BFD_ENDIAN_BIG)
  57     iword = bfd_getb16 (buffer);
  58   else
  59     iword = bfd_getl16 (buffer);
  60
  61   /* Form 1 instructions have the high bit set to 0.  */
  62   if ((iword & (1<<15)) == 0)
  63     {
  64       /* Extract the Form 1 opcode.  */
  65       opcode = &moxie_form1_opc_info[iword >> 8];
  66       switch (opcode->itype)
  67         {
  68         case MOXIE_F1_NARG:
  69           fpr (stream, "%s", opcode->name);
  70           break;
  71         case MOXIE_F1_A:
  72           fpr (stream, "%s\t%s", opcode->name,
  73                reg_names[OP_A(iword)]);
  74           break;
  75         case MOXIE_F1_AB:
  76           fpr (stream, "%s\t%s, %s", opcode->name,
  77                reg_names[OP_A(iword)],
  78                reg_names[OP_B(iword)]);
  79           break;
  80         case MOXIE_F1_A4:
  81           {
  82             unsigned imm;
  83             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
  84               goto fail;
  85             if (info->endian == BFD_ENDIAN_BIG)
  86               imm = bfd_getb32 (buffer);
  87             else
  88               imm = bfd_getl32 (buffer);
  89             fpr (stream, "%s\t%s, 0x%x", opcode->name,
  90                  reg_names[OP_A(iword)], imm);
  91             length = 6;
  92           }
  93           break;
  94         case MOXIE_F1_4:
  95           {
  96             unsigned imm;
  97             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
  98               goto fail;
  99             if (info->endian == BFD_ENDIAN_BIG)
 100               imm = bfd_getb32 (buffer);
 101             else
 102               imm = bfd_getl32 (buffer);
 103             fpr (stream, "%s\t0x%x", opcode->name, imm);
 104             length = 6;
 105           }
 106           break;
 107         case MOXIE_F1_M:
 108           {
 109             unsigned imm;
 110             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
 111               goto fail;
 112             if (info->endian == BFD_ENDIAN_BIG)
 113               imm = bfd_getb32 (buffer);
 114             else
 115               imm = bfd_getl32 (buffer);
 116             fpr (stream, "%s\t", opcode->name);
 117             info->print_address_func ((bfd_vma) imm, info);
 118             length = 6;
 119           }
 120           break;
 121         case MOXIE_F1_AiB:
 122           fpr (stream, "%s\t(%s), %s", opcode->name,
 123                reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 124           break;
 125         case MOXIE_F1_ABi:
 126           fpr (stream, "%s\t%s, (%s)", opcode->name,
 127                reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 128           break;
 129         case MOXIE_F1_4A:
 130           {
 131             unsigned imm;
 132             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
 133               goto fail;
 134             if (info->endian == BFD_ENDIAN_BIG)
 135               imm = bfd_getb32 (buffer);
 136             else
 137               imm = bfd_getl32 (buffer);
 138             fpr (stream, "%s\t0x%x, %s",
 139                  opcode->name, imm, reg_names[OP_A(iword)]);
 140             length = 6;
 141           }
 142           break;
 143         case MOXIE_F1_AiB2:
 144           {
 145             unsigned imm;
 146             if ((status = info->read_memory_func (addr+2, buffer, 2, info)))
 147               goto fail;
 148             if (info->endian == BFD_ENDIAN_BIG)
 149               imm = bfd_getb16 (buffer);
 150             else
 151               imm = bfd_getl16 (buffer);
 152             fpr (stream, "%s\t0x%x(%s), %s", opcode->name,
 153                  imm,
 154                  reg_names[OP_A(iword)],
 155                  reg_names[OP_B(iword)]);
 156             length = 4;
 157           }
 158           break;
 159         case MOXIE_F1_ABi2:
 160           {
 161             unsigned imm;
 162             if ((status = info->read_memory_func (addr+2, buffer, 2, info)))
 163               goto fail;
 164             if (info->endian == BFD_ENDIAN_BIG)
 165               imm = bfd_getb16 (buffer);
 166             else
 167               imm = bfd_getl16 (buffer);
 168             fpr (stream, "%s\t%s, 0x%x(%s)",
 169                  opcode->name,
 170                  reg_names[OP_A(iword)],
 171                  imm,
 172                  reg_names[OP_B(iword)]);
 173             length = 4;
 174           }
 175           break;
 176         case MOXIE_BAD:
 177           fpr (stream, "bad");
 178           break;
 179         default:
 180           abort();
 181         }
 182     }
 183   else if ((iword & (1<<14)) == 0)
 184     {
 185       /* Extract the Form 2 opcode.  */
 186       opcode = &moxie_form2_opc_info[(iword >> 12) & 3];
 187       switch (opcode->itype)
 188         {
 189         case MOXIE_F2_A8V:
 190           fpr (stream, "%s\t%s, 0x%x",
 191                opcode->name,
 192                reg_names[(iword >> 8) & 0xf],
 193                iword & ((1 << 8) - 1));
 194           break;
 195         case MOXIE_F2_NARG:
 196           fpr (stream, "%s", opcode->name);
 197           break;
 198         case MOXIE_BAD:
 199           fpr (stream, "bad");
 200           break;
 201         default:
 202           abort();
 203         }
 204     }
 205   else
 206     {
 207       /* Extract the Form 3 opcode.  */
 208       opcode = &moxie_form3_opc_info[(iword >> 10) & 15];
 209       switch (opcode->itype)
 210         {
 211         case MOXIE_F3_PCREL:
 212           fpr (stream, "%s\t", opcode->name);
 213           info->print_address_func (addr + INST2OFFSET (iword) + 2, info);
 214           break;
 215         case MOXIE_BAD:
 216           fpr (stream, "bad");
 217           break;
 218         default:
 219           abort();
 220         }
 221     }
 222
 223   return length;
 224
 225  fail:
 226   info->memory_error_func (status, addr, info);
 227   return -1;
 228 }