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 #define INST2OFFSET(o) ((((signed short)((o & ((1<<10)-1))<<6))>>6)<<1)
  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   iword = bfd_getb16 (buffer);
  56
  57   /* Form 1 instructions have the high bit set to 0.  */
  58   if ((iword & (1<<15)) == 0)
  59     {
  60       /* Extract the Form 1 opcode.  */
  61       opcode = &moxie_form1_opc_info[iword >> 8];
  62       switch (opcode->itype)
  63         {
  64         case MOXIE_F1_NARG:
  65           fpr (stream, "%s", opcode->name);
  66           break;
  67         case MOXIE_F1_A:
  68           fpr (stream, "%s\t%s", opcode->name,
  69                reg_names[OP_A(iword)]);
  70           break;
  71         case MOXIE_F1_AB:
  72           fpr (stream, "%s\t%s, %s", opcode->name,
  73                reg_names[OP_A(iword)],
  74                reg_names[OP_B(iword)]);
  75           break;
  76         case MOXIE_F1_A4:
  77           {
  78             unsigned imm;
  79             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
  80               goto fail;
  81             imm = bfd_getb32 (buffer);
  82             fpr (stream, "%s\t%s, 0x%x", opcode->name,
  83                  reg_names[OP_A(iword)], imm);
  84             length = 6;
  85           }
  86           break;
  87         case MOXIE_F1_4:
  88           {
  89             unsigned imm;
  90             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
  91               goto fail;
  92             imm = bfd_getb32 (buffer);
  93             fpr (stream, "%s\t0x%x", opcode->name, imm);
  94             length = 6;
  95           }
  96           break;
  97         case MOXIE_F1_M:
  98           {
  99             unsigned imm;
 100             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
 101               goto fail;
 102             imm = bfd_getb32 (buffer);
 103             fpr (stream, "%s\t", opcode->name);
 104             info->print_address_func ((bfd_vma) imm, info);
 105             length = 6;
 106           }
 107           break;
 108         case MOXIE_F1_AiB:
 109           fpr (stream, "%s\t(%s), %s", opcode->name,
 110                reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 111           break;
 112         case MOXIE_F1_ABi:
 113           fpr (stream, "%s\t%s, (%s)", opcode->name,
 114                reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 115           break;
 116         case MOXIE_F1_4A:
 117           {
 118             unsigned imm;
 119             if ((status = info->read_memory_func (addr + 2, buffer, 4, info)))
 120               goto fail;
 121             imm = bfd_getb32 (buffer);
 122             fpr (stream, "%s\t0x%x, %s",
 123                  opcode->name, imm, reg_names[OP_A(iword)]);
 124             length = 6;
 125           }
 126           break;
 127         case MOXIE_F1_AiB4:
 128           {
 129             unsigned imm;
 130             if ((status = info->read_memory_func (addr+2, buffer, 4, info)))
 131               goto fail;
 132             imm = bfd_getb32 (buffer);
 133             fpr (stream, "%s\t0x%x(%s), %s", opcode->name,
 134                  imm,
 135                  reg_names[OP_A(iword)],
 136                  reg_names[OP_B(iword)]);
 137             length = 6;
 138           }
 139           break;
 140         case MOXIE_F1_ABi4:
 141           {
 142             unsigned imm;
 143             if ((status = info->read_memory_func (addr+2, buffer, 4, info)))
 144               goto fail;
 145             imm = bfd_getb32 (buffer);
 146             fpr (stream, "%s\t%s, 0x%x(%s)",
 147                  opcode->name,
 148                  reg_names[OP_A(iword)],
 149                  imm,
 150                  reg_names[OP_B(iword)]);
 151             length = 6;
 152           }
 153           break;
 154         default:
 155           abort ();
 156         }
 157     }
 158   else if ((iword & (1<<14)) == 0)
 159     {
 160       /* Extract the Form 2 opcode.  */
 161       opcode = &moxie_form2_opc_info[(iword >> 12) & 3];
 162       switch (opcode->itype)
 163         {
 164         case MOXIE_F2_A8V:
 165           fpr (stream, "%s\t%s, 0x%x",
 166                opcode->name,
 167                reg_names[(iword >> 8) & 0xf],
 168                iword & ((1 << 8) - 1));
 169           break;
 170         case MOXIE_F2_NARG:
 171           fpr (stream, "%s", opcode->name);
 172           break;
 173         default:
 174           abort();
 175         }
 176     }
 177   else
 178     {
 179       /* Extract the Form 3 opcode.  */
 180       opcode = &moxie_form3_opc_info[(iword >> 10) & 15];
 181       switch (opcode->itype)
 182         {
 183         case MOXIE_F3_PCREL:
 184           fpr (stream, "%s\t", opcode->name);
 185           info->print_address_func ((bfd_vma) (addr + INST2OFFSET(iword)),
 186                                     info);
 187           break;
 188         default:
 189           abort();
 190         }
 191     }
 192
 193   return length;
 194
 195  fail:
 196   info->memory_error_func (status, addr, info);
 197   return -1;
 198 }