opcodes/mcore-dis.c

   1 /* Disassemble Motorolla M*Core instructions.
   2    Copyright (C) 1993, 1999 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., 675 Mass Ave, Cambridge, MA 02139, 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 /* start-sanitize-m340 */
  61   /* MULSH */ 0xFF00,
  62 /* end-sanitize-m340 */
  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 /* start-sanitize-m340 */
 113   if (info->endian == BFD_ENDIAN_BIG)
 114 /* end-sanitize-m340 */
 115     inst = (ibytes[0] << 8) | ibytes[1];
 116 /* start-sanitize-m340 */
 117   else if (info->endian == BFD_ENDIAN_LITTLE)
 118     inst = (ibytes[1] << 8) | ibytes[0];
 119   else
 120     abort ();
 121 /* end-sanitize-m340 */
 122
 123   /* Just a linear search of the table.  */
 124   for (op = mcore_table; op->name != 0; op ++)
 125     if (op->inst == (inst & imsk[op->opclass]))
 126       break;
 127
 128   if (op->name == 0)
 129     fprintf (stream, ".short 0x%04x", inst);
 130   else
 131     {
 132       const char * name = grname[inst & 0x0F];
 133
 134       fprintf (stream, "%s", op->name);
 135
 136       switch (op->opclass)
 137         {
 138         case O0: break;
 139         case OT: fprintf (stream, "\t%d", inst & 0x3); break;
 140         case O1:
 141         case JMP:
 142         case JSR: fprintf (stream, "\t%s", name); break;
 143         case OC:  fprintf (stream, "\t%s, %s", name, crname[(inst >> 4) & 0x1F]); break;
 144         case O1R1: fprintf (stream, "\t%s, r1", name); break;
 145 /* start-sanitize-m340 */
 146         case MULSH:
 147 /* end-sanitize-m340 */
 148         case O2: fprintf (stream, "\t%s, %s", name, grname[(inst >> 4) & 0xF]); break;
 149         case X1: fprintf (stream, "\tr1, %s", name); break;
 150         case OI: fprintf (stream, "\t%s, %d", name, ((inst >> 4) & 0x1F) + 1); break;
 151         case RM: fprintf (stream, "\t%s-r15, (r0)", name); break;
 152         case RQ: fprintf (stream, "\tr4-r7, (%s)", name); break;
 153         case OB:
 154         case OBRa:
 155         case OBRb:
 156         case OBRc:
 157         case SI:
 158         case SIa:
 159         case OMa:
 160         case OMb:
 161         case OMc: fprintf (stream, "\t%s, %d", name, (inst >> 4) & 0x1F); break;
 162         case I7: fprintf (stream, "\t%s, %d", name, (inst >> 4) & 0x7F); break;
 163         case LS: fprintf (stream, "\t%s, (%s, %d)", grname[(inst >> 8) & 0xF],
 164                           name, ((inst >> 4) & 0xF) << isiz[(inst >> 13) & 3]);
 165           break;
 166
 167         case BR:
 168           {
 169             long val = inst & 0x3FF;
 170
 171             if (inst & 0x400)
 172               val |= 0xFFFFFC00;
 173
 174             fprintf (stream, "\t0x%x", memaddr + 2 + (val<<1));
 175
 176             if (strcmp (op->name, "bsr") == 0)
 177               {
 178                 /* for bsr, we'll try to get a symbol for the target */
 179                 val = memaddr + 2 + (val << 1);
 180
 181                 if (info->print_address_func && val != 0)
 182                   {
 183                     fprintf (stream, "\t// ");
 184                     info->print_address_func (val, info);
 185                   }
 186               }
 187           }
 188           break;
 189
 190         case BL:
 191           {
 192             long val;
 193             val = (inst & 0x000F);
 194             fprintf (stream, "\t%s, 0x%x",
 195                     grname[(inst >> 4) & 0xF], memaddr - (val << 1));
 196           }
 197           break;
 198
 199         case LR:
 200           {
 201             unsigned long val;
 202
 203             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 204
 205             status = info->read_memory_func (val, ibytes, 4, info);
 206             if (status != 0)
 207               {
 208                 info->memory_error_func (status, memaddr, info);
 209                 break;
 210               }
 211
 212 /* start-sanitize-m340 */
 213             if (info->endian == BFD_ENDIAN_LITTLE)
 214               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 215                 | (ibytes[1] << 8) | (ibytes[0]);
 216             else
 217 /* end-sanitize-m340 */
 218               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 219                 | (ibytes[2] << 8) | (ibytes[3]);
 220
 221             /* Removed [] around literal value to match ABI syntax 12/95.  */
 222             fprintf (stream, "\t%s, 0x%X", grname[(inst >> 8) & 0xF], val);
 223
 224             if (val == 0)
 225               fprintf (stream, "\t// from address pool at 0x%x",
 226                        (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 227           }
 228           break;
 229
 230         case LJ:
 231           {
 232             unsigned long val;
 233
 234             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 235
 236             status = info->read_memory_func (val, ibytes, 4, info);
 237             if (status != 0)
 238               {
 239                 info->memory_error_func (status, memaddr, info);
 240                 break;
 241               }
 242
 243 /* start-sanitize-m340 */
 244             if (info->endian == BFD_ENDIAN_LITTLE)
 245               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 246                 | (ibytes[1] << 8) | (ibytes[0]);
 247             else
 248 /* end-sanitize-m340 */
 249               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 250                 | (ibytes[2] << 8) | (ibytes[3]);
 251
 252             /* Removed [] around literal value to match ABI syntax 12/95.  */
 253             fprintf (stream, "\t0x%X", val);
 254             /* For jmpi/jsri, we'll try to get a symbol for the target.  */
 255             if (info->print_address_func && val != 0)
 256               {
 257                 fprintf (stream, "\t// ");
 258                 info->print_address_func (val, info);
 259               }
 260             else
 261               {
 262                 fprintf (stream, "\t// from address pool at 0x%x",
 263                          (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 264               }
 265           }
 266           break;
 267
 268         default:
 269           /* if the disassembler lags the instruction set */
 270           fprintf (stream, "\tundecoded operands, inst is 0x%04x", inst);
 271           break;
 272         }
 273     }
 274
 275   /* Say how many bytes we consumed? */
 276   return 2;
 277 }