opcodes/moxie-dis.c

   1 /* Disassemble moxie instructions.
   2    Copyright 2009, 2012
   3    Free Software Foundation, Inc.
   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
  25 #define STATIC_TABLE
  26 #define DEFINE_TABLE
  27
  28 #include "opcode/moxie.h"
  29 #include "dis-asm.h"
  30
  31 static fprintf_ftype fpr;
  32 static void *stream;
  33
  34 /* Macros to extract operands from the instruction word.  */
  35 #define OP_A(i) ((i >> 4) & 0xf)
  36 #define OP_B(i) (i & 0xf)
  37 #define INST2OFFSET(o) ((((signed short)((o & ((1<<10)-1))<<6))>>6)<<1)
  38
  39 static const char * reg_names[16] =
  40   { "$fp", "$sp", "$r0", "$r1", "$r2", "$r3", "$r4", "$r5",
  41     "$r6", "$r7", "$r8", "$r9", "$r10", "$r11", "$r12", "$r13" };
  42
  43 int
  44 print_insn_moxie (bfd_vma addr, struct disassemble_info * info)
  45 {
  46   int length = 2;
  47   int status;
  48   stream = info->stream;
  49   const moxie_opc_info_t * opcode;
  50   bfd_byte buffer[4];
  51   unsigned short iword;
  52   fpr = info->fprintf_func;
  53
  54   if ((status = info->read_memory_func (addr, buffer, 2, info)))
  55     goto fail;
  56
  57   if (info->endian == BFD_ENDIAN_BIG)
  58     iword = bfd_getb16 (buffer);
  59   else
  60     iword = bfd_getl16 (buffer);
  61
  62   /* Form 1 instructions have the high bit set to 0.  */
  63   if ((iword & (1<<15)) == 0)
  64     {
  65       /* Extract the Form 1 opcode.  */
  66       opcode = &moxie_form1_opc_info[iword >> 8];
  67       switch (opcode->itype)
  68         {
  69         case MOXIE_F1_NARG:
  70           fpr (stream, "%s", opcode->name);
  71           break;
  72         case MOXIE_F1_A:
  73           fpr (stream, "%s\t%s", opcode->name,
  74                reg_names[OP_A(iword)]);
  75           break;
  76         case MOXIE_F1_AB:
  77           fpr (stream, "%s\t%s, %s", opcode->name,
  78                reg_names[OP_A(iword)],
  79                reg_names[OP_B(iword)]);
  80           break;
  81         case MOXIE_F1_A4:
  82           {
  83             unsigned imm;
  84             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
  85               goto fail;
  86             if (info->endian == BFD_ENDIAN_BIG)
  87               imm = bfd_getb32 (buffer);
  88             else
  89               imm = bfd_getl32 (buffer);
  90             fpr (stream, "%s\t%s, 0x%x", opcode->name,
  91                  reg_names[OP_A(iword)], imm);
  92             length = 6;
  93           }
  94           break;
  95         case MOXIE_F1_4:
  96           {
  97             unsigned imm;
  98             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
  99               goto fail;
 100             if (info->endian == BFD_ENDIAN_BIG)
 101               imm = bfd_getb32 (buffer);
 102             else
 103               imm = bfd_getl32 (buffer);
 104             fpr (stream, "%s\t0x%x", opcode->name, imm);
 105             length = 6;
 106           }
 107           break;
 108         case MOXIE_F1_M:
 109           {
 110             unsigned imm;
 111             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
 112               goto fail;
 113             if (info->endian == BFD_ENDIAN_BIG)
 114               imm = bfd_getb32 (buffer);
 115             else
 116               imm = bfd_getl32 (buffer);
 117             fpr (stream, "%s\t", opcode->name);
 118             info->print_address_func ((bfd_vma) imm, info);
 119             length = 6;
 120           }
 121           break;
 122         case MOXIE_F1_AiB:
 123           fpr (stream, "%s\t(%s), %s", opcode->name,
 124                reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 125           break;
 126         case MOXIE_F1_ABi:
 127           fpr (stream, "%s\t%s, (%s)", opcode->name,
 128                reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 129           break;
 130         case MOXIE_F1_4A:
 131           {
 132             unsigned imm;
 133             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
 134               goto fail;
 135             if (info->endian == BFD_ENDIAN_BIG)
 136               imm = bfd_getb32 (buffer);
 137             else
 138               imm = bfd_getl32 (buffer);
 139             fpr (stream, "%s\t0x%x, %s",
 140                  opcode->name, imm, reg_names[OP_A(iword)]);
 141             length = 6;
 142           }
 143           break;
 144         case MOXIE_F1_AiB4:
 145           {
 146             unsigned imm;
 147             if ((status = info->read_memory_func (addr+2, buffer, 4, info)))
 148               goto fail;
 149             if (info->endian == BFD_ENDIAN_BIG)
 150               imm = bfd_getb32 (buffer);
 151             else
 152               imm = bfd_getl32 (buffer);
 153             fpr (stream, "%s\t0x%x(%s), %s", opcode->name,
 154                  imm,
 155                  reg_names[OP_A(iword)],
 156                  reg_names[OP_B(iword)]);
 157             length = 6;
 158           }
 159           break;
 160         case MOXIE_F1_ABi4:
 161           {
 162             unsigned imm;
 163             if ((status = info->read_memory_func (addr+2, buffer, 4, info)))
 164               goto fail;
 165             if (info->endian == BFD_ENDIAN_BIG)
 166               imm = bfd_getb32 (buffer);
 167             else
 168               imm = bfd_getl32 (buffer);
 169             fpr (stream, "%s\t%s, 0x%x(%s)",
 170                  opcode->name,
 171                  reg_names[OP_A(iword)],
 172                  imm,
 173                  reg_names[OP_B(iword)]);
 174             length = 6;
 175           }
 176           break;
 177         case MOXIE_BAD:
 178           fpr (stream, "bad");
 179           break;
 180         default:
 181           abort();
 182         }
 183     }
 184   else if ((iword & (1<<14)) == 0)
 185     {
 186       /* Extract the Form 2 opcode.  */
 187       opcode = &moxie_form2_opc_info[(iword >> 12) & 3];
 188       switch (opcode->itype)
 189         {
 190         case MOXIE_F2_A8V:
 191           fpr (stream, "%s\t%s, 0x%x",
 192                opcode->name,
 193                reg_names[(iword >> 8) & 0xf],
 194                iword & ((1 << 8) - 1));
 195           break;
 196         case MOXIE_F2_NARG:
 197           fpr (stream, "%s", opcode->name);
 198           break;
 199         case MOXIE_BAD:
 200           fpr (stream, "bad");
 201           break;
 202         default:
 203           abort();
 204         }
 205     }
 206   else
 207     {
 208       /* Extract the Form 3 opcode.  */
 209       opcode = &moxie_form3_opc_info[(iword >> 10) & 15];
 210       switch (opcode->itype)
 211         {
 212         case MOXIE_F3_PCREL:
 213           fpr (stream, "%s\t", opcode->name);
 214           info->print_address_func ((bfd_vma) (addr + INST2OFFSET(iword) + 2),
 215                                     info);
 216           break;
 217         case MOXIE_BAD:
 218           fpr (stream, "bad");
 219           break;
 220         default:
 221           abort();
 222         }
 223     }
 224
 225   return length;
 226
 227  fail:
 228   info->memory_error_func (status, addr, info);
 229   return -1;
 230 }