opcodes/moxie-dis.c

   1 /* Disassemble moxie instructions.
   2    Copyright 2009
   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 <stdio.h>
  23 #include "sysdep.h"
  24 #define STATIC_TABLE
  25 #define DEFINE_TABLE
  26
  27 #include "opcode/moxie.h"
  28 #include "dis-asm.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
  37 static const char * reg_names[16] =
  38   { "$fp", "$sp", "$r0", "$r1", "$r2", "$r3", "$r4", "$r5",
  39     "$r6", "$r7", "$r8", "$r9", "$r10", "$r11", "$r12", "$r13" };
  40
  41 int
  42 print_insn_moxie (bfd_vma addr, struct disassemble_info * info)
  43 {
  44   int length = 2;
  45   int status;
  46   stream = info->stream;
  47   const moxie_opc_info_t * opcode;
  48   bfd_byte buffer[4];
  49   unsigned short iword;
  50   fpr = info->fprintf_func;
  51
  52   if ((status = info->read_memory_func (addr, buffer, 2, info)))
  53     goto fail;
  54   iword = bfd_getb16 (buffer);
  55
  56   /* Form 1 instructions have the high bit set to 0.  */
  57   if ((iword & (1<<15)) == 0)
  58     {
  59       /* Extract the Form 1 opcode.  */
  60       opcode = &moxie_form1_opc_info[iword >> 8];
  61       switch (opcode->itype)
  62         {
  63         case MOXIE_F1_NARG:
  64           fpr (stream, "%s", opcode->name);
  65           break;
  66         case MOXIE_F1_A:
  67           fpr (stream, "%s\t%s", opcode->name,
  68                reg_names[OP_A(iword)]);
  69           break;
  70         case MOXIE_F1_AB:
  71           fpr (stream, "%s\t%s, %s", opcode->name,
  72                reg_names[OP_A(iword)],
  73                reg_names[OP_B(iword)]);
  74           break;
  75         case MOXIE_F1_A4:
  76           {
  77             unsigned imm;
  78             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
  79               goto fail;
  80             imm = bfd_getb32 (buffer);
  81             fpr (stream, "%s\t%s, 0x%x", opcode->name,
  82                  reg_names[OP_A(iword)], imm);
  83             length = 6;
  84           }
  85           break;
  86         case MOXIE_F1_4:
  87           {
  88             unsigned imm;
  89             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
  90               goto fail;
  91             imm = bfd_getb32 (buffer);
  92             fpr (stream, "%s\t0x%x", opcode->name, imm);
  93             length = 6;
  94           }
  95           break;
  96         case MOXIE_F1_M:
  97           {
  98             unsigned imm;
  99             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
 100               goto fail;
 101             imm = bfd_getb32 (buffer);
 102             fpr (stream, "%s\t", opcode->name);
 103             info->print_address_func ((bfd_vma) imm, info);
 104             length = 6;
 105           }
 106           break;
 107         case MOXIE_F1_AiB:
 108           fpr (stream, "%s\t(%s), %s", opcode->name,
 109                reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 110           break;
 111         case MOXIE_F1_ABi:
 112           fpr (stream, "%s\t%s, (%s)", opcode->name,
 113                reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 114           break;
 115         case MOXIE_F1_4A:
 116           {
 117             unsigned imm;
 118             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
 119               goto fail;
 120             imm = bfd_getb32 (buffer);
 121             fpr (stream, "%s\t0x%x, %s",
 122                  opcode->name, imm, reg_names[OP_A(iword)]);
 123             length = 6;
 124           }
 125           break;
 126         case MOXIE_F1_AiB4:
 127           {
 128             unsigned imm;
 129             if ((status = info->read_memory_func (addr+2, buffer, 4, info)))
 130               goto fail;
 131             imm = bfd_getb32 (buffer);
 132             fpr (stream, "%s\t0x%x(%s), %s", opcode->name,
 133                  imm,
 134                  reg_names[OP_A(iword)],
 135                  reg_names[OP_B(iword)]);
 136             length = 6;
 137           }
 138           break;
 139         case MOXIE_F1_ABi4:
 140           {
 141             unsigned imm;
 142             if ((status = info->read_memory_func (addr+2, buffer, 4, info)))
 143               goto fail;
 144             imm = bfd_getb32 (buffer);
 145             fpr (stream, "%s\t%s, 0x%x(%s)",
 146                  opcode->name,
 147                  reg_names[OP_A(iword)],
 148                  imm,
 149                  reg_names[OP_B(iword)]);
 150             length = 6;
 151           }
 152           break;
 153         default:
 154           abort ();
 155         }
 156     }
 157   else if ((iword & (1<<14)) == 0)
 158     {
 159       /* Extract the Form 2 opcode.  */
 160       opcode = &moxie_form2_opc_info[(iword >> 12) & 3];
 161       switch (opcode->itype)
 162         {
 163         case MOXIE_F2_A8V:
 164           fpr (stream, "%s\t%s, 0x%x",
 165                opcode->name,
 166                reg_names[(iword >> 8) & 0xf],
 167                iword & ((1 << 8) - 1));
 168           break;
 169         case MOXIE_F2_NARG:
 170           fpr (stream, "%s", opcode->name);
 171           break;
 172         default:
 173           abort();
 174         }
 175     }
 176   else
 177     {
 178       /* Extract the Form 3 opcode.  */
 179       opcode = &moxie_form2_opc_info[(iword >> 12) & 3];
 180       switch (opcode->itype)
 181         {
 182         case MOXIE_F3_NARG:
 183           fpr (stream, "%s", opcode->name);
 184           break;
 185         default:
 186           abort();
 187         }
 188     }
 189
 190   return length;
 191
 192  fail:
 193   info->memory_error_func (status, addr, info);
 194   return -1;
 195 }