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 <stdio.h>
  19 #define STATIC_TABLE
  20 #define DEFINE_TABLE
  21
  22 #include "mcore-opc.h"
  23 #include "dis-asm.h"
  24
  25 /* Mask for each mcore_opclass: */
  26 static const unsigned short imsk[] =
  27 {
  28     /* O0  */ 0xFFFF,
  29     /* OT  */ 0xFFFC,
  30     /* O1  */ 0xFFF0,
  31     /* OC  */ 0xFFE0,
  32     /* O2  */ 0xFF00,
  33     /* X1  */ 0xFFF0,
  34     /* OI  */ 0xFE00,
  35     /* OB  */ 0xFE00,
  36
  37     /* OMa */ 0xFFF0,
  38     /* SI  */ 0xFE00,
  39     /* I7  */ 0xF800,
  40     /* LS  */ 0xF000,
  41     /* BR  */ 0xF800,
  42     /* BL  */ 0xFF00,
  43     /* LR  */ 0xF000,
  44     /* LJ  */ 0xFF00,
  45
  46     /* RM  */ 0xFFF0,
  47     /* RQ  */ 0xFFF0,
  48     /* JSR */ 0xFFF0,
  49     /* JMP */ 0xFFF0,
  50     /* OBRa*/ 0xFFF0,
  51     /* OBRb*/ 0xFF80,
  52     /* OBRc*/ 0xFF00,
  53     /* OBR2*/ 0xFE00,
  54
  55     /* O1R1*/ 0xFFF0,
  56     /* OMb */ 0xFF80,
  57     /* OMc */ 0xFF00,
  58     /* SIa */ 0xFE00,
  59
  60   /* MULSH */ 0xFF00,
  61   /* OPSR  */ 0xFFF8,   /* psrset/psrclr */
  62
  63     /* JC  */ 0,                /* JC,JU,JL don't appear in object */
  64     /* JU  */ 0,
  65     /* JL  */ 0,
  66     /* RSI */ 0,
  67     /* DO21*/ 0,
  68     /* OB2 */ 0                 /* OB2 won't appear in object. */
  69 };
  70
  71 static const char * grname[] =
  72 {
  73  "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  74  "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15"
  75 };
  76
  77 static const char X[] = "??";
  78
  79 static const char * crname[] =
  80 {
  81   "psr",  "vbr", "epsr", "fpsr", "epc",  "fpc",  "ss0",  "ss1",
  82   "ss2",  "ss3", "ss4",  "gcr",  "gsr",     X,      X,      X,
  83      X,      X,      X,      X,      X,     X,      X,      X,
  84      X,      X,      X,      X,      X,     X,      X,      X
  85 };
  86
  87 static const unsigned isiz[] = { 2, 0, 1, 0 };
  88
  89 int
  90 print_insn_mcore (memaddr, info)
  91      bfd_vma memaddr;
  92      struct disassemble_info * info;
  93 {
  94   unsigned char       ibytes[4];
  95   fprintf_ftype       fprintf = info->fprintf_func;
  96   void *              stream = info->stream;
  97   unsigned short      inst;
  98   mcore_opcode_info * op;
  99   int                 status;
 100
 101   info->bytes_per_chunk = 2;
 102
 103   status = info->read_memory_func (memaddr, ibytes, 2, info);
 104
 105   if (status != 0)
 106     {
 107       info->memory_error_func (status, memaddr, info);
 108       return -1;
 109     }
 110
 111   if (info->endian == BFD_ENDIAN_BIG)
 112     inst = (ibytes[0] << 8) | ibytes[1];
 113   else if (info->endian == BFD_ENDIAN_LITTLE)
 114     inst = (ibytes[1] << 8) | ibytes[0];
 115   else
 116     abort ();
 117
 118   /* Just a linear search of the table.  */
 119   for (op = mcore_table; op->name != 0; op ++)
 120     if (op->inst == (inst & imsk[op->opclass]))
 121       break;
 122
 123   if (op->name == 0)
 124     fprintf (stream, ".short 0x%04x", inst);
 125   else
 126     {
 127       const char * name = grname[inst & 0x0F];
 128
 129       fprintf (stream, "%s", op->name);
 130
 131       switch (op->opclass)
 132         {
 133         case O0: break;
 134         case OT: fprintf (stream, "\t%d", inst & 0x3); break;
 135         case O1:
 136         case JMP:
 137         case JSR: fprintf (stream, "\t%s", name); break;
 138         case OC:  fprintf (stream, "\t%s, %s", name, crname[(inst >> 4) & 0x1F]); break;
 139         case O1R1: fprintf (stream, "\t%s, r1", name); break;
 140         case MULSH:
 141         case O2: fprintf (stream, "\t%s, %s", name, grname[(inst >> 4) & 0xF]); break;
 142         case X1: fprintf (stream, "\tr1, %s", name); break;
 143         case OI: fprintf (stream, "\t%s, %d", name, ((inst >> 4) & 0x1F) + 1); break;
 144         case RM: fprintf (stream, "\t%s-r15, (r0)", name); break;
 145         case RQ: fprintf (stream, "\tr4-r7, (%s)", name); break;
 146         case OB:
 147         case OBRa:
 148         case OBRb:
 149         case OBRc:
 150         case SI:
 151         case SIa:
 152         case OMa:
 153         case OMb:
 154         case OMc: fprintf (stream, "\t%s, %d", name, (inst >> 4) & 0x1F); break;
 155         case I7: fprintf (stream, "\t%s, %d", name, (inst >> 4) & 0x7F); break;
 156         case LS: fprintf (stream, "\t%s, (%s, %d)", grname[(inst >> 8) & 0xF],
 157                           name, ((inst >> 4) & 0xF) << isiz[(inst >> 13) & 3]);
 158           break;
 159
 160         case BR:
 161           {
 162             long val = inst & 0x3FF;
 163
 164             if (inst & 0x400)
 165               val |= 0xFFFFFC00;
 166
 167             fprintf (stream, "\t0x%x", memaddr + 2 + (val<<1));
 168
 169             if (strcmp (op->name, "bsr") == 0)
 170               {
 171                 /* for bsr, we'll try to get a symbol for the target */
 172                 val = memaddr + 2 + (val << 1);
 173
 174                 if (info->print_address_func && val != 0)
 175                   {
 176                     fprintf (stream, "\t// ");
 177                     info->print_address_func (val, info);
 178                   }
 179               }
 180           }
 181           break;
 182
 183         case BL:
 184           {
 185             long val;
 186             val = (inst & 0x000F);
 187             fprintf (stream, "\t%s, 0x%x",
 188                     grname[(inst >> 4) & 0xF], memaddr - (val << 1));
 189           }
 190           break;
 191
 192         case LR:
 193           {
 194             unsigned long val;
 195
 196             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 197
 198             status = info->read_memory_func (val, ibytes, 4, info);
 199             if (status != 0)
 200               {
 201                 info->memory_error_func (status, memaddr, info);
 202                 break;
 203               }
 204
 205             if (info->endian == BFD_ENDIAN_LITTLE)
 206               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 207                 | (ibytes[1] << 8) | (ibytes[0]);
 208             else
 209               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 210                 | (ibytes[2] << 8) | (ibytes[3]);
 211
 212             /* Removed [] around literal value to match ABI syntax 12/95.  */
 213             fprintf (stream, "\t%s, 0x%X", grname[(inst >> 8) & 0xF], val);
 214
 215             if (val == 0)
 216               fprintf (stream, "\t// from address pool at 0x%x",
 217                        (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 218           }
 219           break;
 220
 221         case LJ:
 222           {
 223             unsigned long val;
 224
 225             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 226
 227             status = info->read_memory_func (val, ibytes, 4, info);
 228             if (status != 0)
 229               {
 230                 info->memory_error_func (status, memaddr, info);
 231                 break;
 232               }
 233
 234             if (info->endian == BFD_ENDIAN_LITTLE)
 235               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 236                 | (ibytes[1] << 8) | (ibytes[0]);
 237             else
 238               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 239                 | (ibytes[2] << 8) | (ibytes[3]);
 240
 241             /* Removed [] around literal value to match ABI syntax 12/95.  */
 242             fprintf (stream, "\t0x%X", val);
 243             /* For jmpi/jsri, we'll try to get a symbol for the target.  */
 244             if (info->print_address_func && val != 0)
 245               {
 246                 fprintf (stream, "\t// ");
 247                 info->print_address_func (val, info);
 248               }
 249             else
 250               {
 251                 fprintf (stream, "\t// from address pool at 0x%x",
 252                          (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 253               }
 254           }
 255           break;
 256
 257         case OPSR:
 258           {
 259             static char * fields[] =
 260             {
 261               "af", "ie",    "fe",    "fe,ie",
 262               "ee", "ee,ie", "ee,fe", "ee,fe,ie"
 263             };
 264
 265             fprintf (stream, "\t%s", fields[inst & 0x7]);
 266           }
 267           break;
 268
 269         default:
 270           /* if the disassembler lags the instruction set */
 271           fprintf (stream, "\tundecoded operands, inst is 0x%04x", inst);
 272           break;
 273         }
 274     }
 275
 276   /* Say how many bytes we consumed? */
 277   return 2;
 278 }