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   iword = bfd_getb16 (buffer);
  57
  58   /* Form 1 instructions have the high bit set to 0.  */
  59   if ((iword & (1<<15)) == 0)
  60     {
  61       /* Extract the Form 1 opcode.  */
  62       opcode = &moxie_form1_opc_info[iword >> 8];
  63       switch (opcode->itype)
  64         {
  65         case MOXIE_F1_NARG:
  66           fpr (stream, "%s", opcode->name);
  67           break;
  68         case MOXIE_F1_A:
  69           fpr (stream, "%s\t%s", opcode->name,
  70                reg_names[OP_A(iword)]);
  71           break;
  72         case MOXIE_F1_AB:
  73           fpr (stream, "%s\t%s, %s", opcode->name,
  74                reg_names[OP_A(iword)],
  75                reg_names[OP_B(iword)]);
  76           break;
  77         case MOXIE_F1_A4:
  78           {
  79             unsigned imm;
  80             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
  81               goto fail;
  82             imm = bfd_getb32 (buffer);
  83             fpr (stream, "%s\t%s, 0x%x", opcode->name,
  84                  reg_names[OP_A(iword)], imm);
  85             length = 6;
  86           }
  87           break;
  88         case MOXIE_F1_4:
  89           {
  90             unsigned imm;
  91             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
  92               goto fail;
  93             imm = bfd_getb32 (buffer);
  94             fpr (stream, "%s\t0x%x", opcode->name, imm);
  95             length = 6;
  96           }
  97           break;
  98         case MOXIE_F1_M:
  99           {
 100             unsigned imm;
 101             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
 102               goto fail;
 103             imm = bfd_getb32 (buffer);
 104             fpr (stream, "%s\t", opcode->name);
 105             info->print_address_func ((bfd_vma) imm, info);
 106             length = 6;
 107           }
 108           break;
 109         case MOXIE_F1_AiB:
 110           fpr (stream, "%s\t(%s), %s", opcode->name,
 111                reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 112           break;
 113         case MOXIE_F1_ABi:
 114           fpr (stream, "%s\t%s, (%s)", opcode->name,
 115                reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 116           break;
 117         case MOXIE_F1_4A:
 118           {
 119             unsigned imm;
 120             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
 121               goto fail;
 122             imm = bfd_getb32 (buffer);
 123             fpr (stream, "%s\t0x%x, %s",
 124                  opcode->name, imm, reg_names[OP_A(iword)]);
 125             length = 6;
 126           }
 127           break;
 128         case MOXIE_F1_AiB4:
 129           {
 130             unsigned imm;
 131             if ((status = info->read_memory_func (addr+2, buffer, 4, info)))
 132               goto fail;
 133             imm = bfd_getb32 (buffer);
 134             fpr (stream, "%s\t0x%x(%s), %s", opcode->name,
 135                  imm,
 136                  reg_names[OP_A(iword)],
 137                  reg_names[OP_B(iword)]);
 138             length = 6;
 139           }
 140           break;
 141         case MOXIE_F1_ABi4:
 142           {
 143             unsigned imm;
 144             if ((status = info->read_memory_func (addr+2, buffer, 4, info)))
 145               goto fail;
 146             imm = bfd_getb32 (buffer);
 147             fpr (stream, "%s\t%s, 0x%x(%s)",
 148                  opcode->name,
 149                  reg_names[OP_A(iword)],
 150                  imm,
 151                  reg_names[OP_B(iword)]);
 152             length = 6;
 153           }
 154           break;
 155         default:
 156           abort ();
 157         }
 158     }
 159   else if ((iword & (1<<14)) == 0)
 160     {
 161       /* Extract the Form 2 opcode.  */
 162       opcode = &moxie_form2_opc_info[(iword >> 12) & 3];
 163       switch (opcode->itype)
 164         {
 165         case MOXIE_F2_A8V:
 166           fpr (stream, "%s\t%s, 0x%x",
 167                opcode->name,
 168                reg_names[(iword >> 8) & 0xf],
 169                iword & ((1 << 8) - 1));
 170           break;
 171         case MOXIE_F2_NARG:
 172           fpr (stream, "%s", opcode->name);
 173           break;
 174         default:
 175           abort();
 176         }
 177     }
 178   else
 179     {
 180       /* Extract the Form 3 opcode.  */
 181       opcode = &moxie_form3_opc_info[(iword >> 10) & 15];
 182       switch (opcode->itype)
 183         {
 184         case MOXIE_F3_PCREL:
 185           fpr (stream, "%s\t", opcode->name);
 186           info->print_address_func ((bfd_vma) (addr + INST2OFFSET(iword)),
 187                                     info);
 188           break;
 189         default:
 190           abort();
 191         }
 192     }
 193
 194   return length;
 195
 196  fail:
 197   info->memory_error_func (status, addr, info);
 198   return -1;
 199 }