opcodes/mcore-dis.c

   1 /* Disassemble Motorola M*Core instructions.
   2    Copyright (C) 1993, 1999, 2000 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #include "sysdep.h"
  19 #include <stdio.h>
  20 #define STATIC_TABLE
  21 #define DEFINE_TABLE
  22
  23 #include "mcore-opc.h"
  24 #include "dis-asm.h"
  25
  26 /* Mask for each mcore_opclass: */
  27 static const unsigned short imsk[] =
  28 {
  29     /* O0  */ 0xFFFF,
  30     /* OT  */ 0xFFFC,
  31     /* O1  */ 0xFFF0,
  32     /* OC  */ 0xFFE0,
  33     /* O2  */ 0xFF00,
  34     /* X1  */ 0xFFF0,
  35     /* OI  */ 0xFE00,
  36     /* OB  */ 0xFE00,
  37
  38     /* OMa */ 0xFFF0,
  39     /* SI  */ 0xFE00,
  40     /* I7  */ 0xF800,
  41     /* LS  */ 0xF000,
  42     /* BR  */ 0xF800,
  43     /* BL  */ 0xFF00,
  44     /* LR  */ 0xF000,
  45     /* LJ  */ 0xFF00,
  46
  47     /* RM  */ 0xFFF0,
  48     /* RQ  */ 0xFFF0,
  49     /* JSR */ 0xFFF0,
  50     /* JMP */ 0xFFF0,
  51     /* OBRa*/ 0xFFF0,
  52     /* OBRb*/ 0xFF80,
  53     /* OBRc*/ 0xFF00,
  54     /* OBR2*/ 0xFE00,
  55
  56     /* O1R1*/ 0xFFF0,
  57     /* OMb */ 0xFF80,
  58     /* OMc */ 0xFF00,
  59     /* SIa */ 0xFE00,
  60
  61   /* MULSH */ 0xFF00,
  62   /* OPSR  */ 0xFFF8,   /* psrset/psrclr */
  63
  64     /* JC  */ 0,                /* JC,JU,JL don't appear in object */
  65     /* JU  */ 0,
  66     /* JL  */ 0,
  67     /* RSI */ 0,
  68     /* DO21*/ 0,
  69     /* OB2 */ 0                 /* OB2 won't appear in object. */
  70 };
  71
  72 static const char * grname[] =
  73 {
  74  "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  75  "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15"
  76 };
  77
  78 static const char X[] = "??";
  79
  80 static const char * crname[] =
  81 {
  82   "psr",  "vbr", "epsr", "fpsr", "epc",  "fpc",  "ss0",  "ss1",
  83   "ss2",  "ss3", "ss4",  "gcr",  "gsr",     X,      X,      X,
  84      X,      X,      X,      X,      X,     X,      X,      X,
  85      X,      X,      X,      X,      X,     X,      X,      X
  86 };
  87
  88 static const unsigned isiz[] = { 2, 0, 1, 0 };
  89
  90 int
  91 print_insn_mcore (memaddr, info)
  92      bfd_vma memaddr;
  93      struct disassemble_info * info;
  94 {
  95   unsigned char       ibytes[4];
  96   fprintf_ftype       fprintf = info->fprintf_func;
  97   void *              stream = info->stream;
  98   unsigned short      inst;
  99   mcore_opcode_info * op;
 100   int                 status;
 101
 102   info->bytes_per_chunk = 2;
 103
 104   status = info->read_memory_func (memaddr, ibytes, 2, info);
 105
 106   if (status != 0)
 107     {
 108       info->memory_error_func (status, memaddr, info);
 109       return -1;
 110     }
 111
 112   if (info->endian == BFD_ENDIAN_BIG)
 113     inst = (ibytes[0] << 8) | ibytes[1];
 114   else if (info->endian == BFD_ENDIAN_LITTLE)
 115     inst = (ibytes[1] << 8) | ibytes[0];
 116   else
 117     abort ();
 118
 119   /* Just a linear search of the table.  */
 120   for (op = mcore_table; op->name != 0; op ++)
 121     if (op->inst == (inst & imsk[op->opclass]))
 122       break;
 123
 124   if (op->name == 0)
 125     fprintf (stream, ".short 0x%04x", inst);
 126   else
 127     {
 128       const char * name = grname[inst & 0x0F];
 129
 130       fprintf (stream, "%s", op->name);
 131
 132       switch (op->opclass)
 133         {
 134         case O0: break;
 135         case OT: fprintf (stream, "\t%d", inst & 0x3); break;
 136         case O1:
 137         case JMP:
 138         case JSR: fprintf (stream, "\t%s", name); break;
 139         case OC:  fprintf (stream, "\t%s, %s", name, crname[(inst >> 4) & 0x1F]); break;
 140         case O1R1: fprintf (stream, "\t%s, r1", name); break;
 141         case MULSH:
 142         case O2: fprintf (stream, "\t%s, %s", name, grname[(inst >> 4) & 0xF]); break;
 143         case X1: fprintf (stream, "\tr1, %s", name); break;
 144         case OI: fprintf (stream, "\t%s, %d", name, ((inst >> 4) & 0x1F) + 1); break;
 145         case RM: fprintf (stream, "\t%s-r15, (r0)", name); break;
 146         case RQ: fprintf (stream, "\tr4-r7, (%s)", name); break;
 147         case OB:
 148         case OBRa:
 149         case OBRb:
 150         case OBRc:
 151         case SI:
 152         case SIa:
 153         case OMa:
 154         case OMb:
 155         case OMc: fprintf (stream, "\t%s, %d", name, (inst >> 4) & 0x1F); break;
 156         case I7: fprintf (stream, "\t%s, %d", name, (inst >> 4) & 0x7F); break;
 157         case LS: fprintf (stream, "\t%s, (%s, %d)", grname[(inst >> 8) & 0xF],
 158                           name, ((inst >> 4) & 0xF) << isiz[(inst >> 13) & 3]);
 159           break;
 160
 161         case BR:
 162           {
 163             long val = inst & 0x3FF;
 164
 165             if (inst & 0x400)
 166               val |= 0xFFFFFC00;
 167
 168             fprintf (stream, "\t0x%x", memaddr + 2 + (val<<1));
 169
 170             if (strcmp (op->name, "bsr") == 0)
 171               {
 172                 /* for bsr, we'll try to get a symbol for the target */
 173                 val = memaddr + 2 + (val << 1);
 174
 175                 if (info->print_address_func && val != 0)
 176                   {
 177                     fprintf (stream, "\t// ");
 178                     info->print_address_func (val, info);
 179                   }
 180               }
 181           }
 182           break;
 183
 184         case BL:
 185           {
 186             long val;
 187             val = (inst & 0x000F);
 188             fprintf (stream, "\t%s, 0x%x",
 189                     grname[(inst >> 4) & 0xF], memaddr - (val << 1));
 190           }
 191           break;
 192
 193         case LR:
 194           {
 195             unsigned long val;
 196
 197             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 198
 199             status = info->read_memory_func (val, ibytes, 4, info);
 200             if (status != 0)
 201               {
 202                 info->memory_error_func (status, memaddr, info);
 203                 break;
 204               }
 205
 206             if (info->endian == BFD_ENDIAN_LITTLE)
 207               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 208                 | (ibytes[1] << 8) | (ibytes[0]);
 209             else
 210               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 211                 | (ibytes[2] << 8) | (ibytes[3]);
 212
 213             /* Removed [] around literal value to match ABI syntax 12/95.  */
 214             fprintf (stream, "\t%s, 0x%X", grname[(inst >> 8) & 0xF], val);
 215
 216             if (val == 0)
 217               fprintf (stream, "\t// from address pool at 0x%x",
 218                        (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 219           }
 220           break;
 221
 222         case LJ:
 223           {
 224             unsigned long val;
 225
 226             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 227
 228             status = info->read_memory_func (val, ibytes, 4, info);
 229             if (status != 0)
 230               {
 231                 info->memory_error_func (status, memaddr, info);
 232                 break;
 233               }
 234
 235             if (info->endian == BFD_ENDIAN_LITTLE)
 236               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 237                 | (ibytes[1] << 8) | (ibytes[0]);
 238             else
 239               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 240                 | (ibytes[2] << 8) | (ibytes[3]);
 241
 242             /* Removed [] around literal value to match ABI syntax 12/95.  */
 243             fprintf (stream, "\t0x%X", val);
 244             /* For jmpi/jsri, we'll try to get a symbol for the target.  */
 245             if (info->print_address_func && val != 0)
 246               {
 247                 fprintf (stream, "\t// ");
 248                 info->print_address_func (val, info);
 249               }
 250             else
 251               {
 252                 fprintf (stream, "\t// from address pool at 0x%x",
 253                          (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 254               }
 255           }
 256           break;
 257
 258         case OPSR:
 259           {
 260             static char * fields[] =
 261             {
 262               "af", "ie",    "fe",    "fe,ie",
 263               "ee", "ee,ie", "ee,fe", "ee,fe,ie"
 264             };
 265
 266             fprintf (stream, "\t%s", fields[inst & 0x7]);
 267           }
 268           break;
 269
 270         default:
 271           /* if the disassembler lags the instruction set */
 272           fprintf (stream, "\tundecoded operands, inst is 0x%04x", inst);
 273           break;
 274         }
 275     }
 276
 277   /* Say how many bytes we consumed? */
 278   return 2;
 279 }