opcodes/mcore-dis.c

   1 /* Disassemble Motorola M*Core instructions.
   2    Copyright 1993, 1999, 2000, 2001, 2002, 2005, 2007
   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 #define STATIC_TABLE
  25 #define DEFINE_TABLE
  26
  27 #include "mcore-opc.h"
  28 #include "dis-asm.h"
  29
  30 /* Mask for each mcore_opclass: */
  31 static const unsigned short imsk[] = {
  32     /* O0  */ 0xFFFF,
  33     /* OT  */ 0xFFFC,
  34     /* O1  */ 0xFFF0,
  35     /* OC  */ 0xFE00,
  36     /* O2  */ 0xFF00,
  37     /* X1  */ 0xFFF0,
  38     /* OI  */ 0xFE00,
  39     /* OB  */ 0xFE00,
  40
  41     /* OMa */ 0xFFF0,
  42     /* SI  */ 0xFE00,
  43     /* I7  */ 0xF800,
  44     /* LS  */ 0xF000,
  45     /* BR  */ 0xF800,
  46     /* BL  */ 0xFF00,
  47     /* LR  */ 0xF000,
  48     /* LJ  */ 0xFF00,
  49
  50     /* RM  */ 0xFFF0,
  51     /* RQ  */ 0xFFF0,
  52     /* JSR */ 0xFFF0,
  53     /* JMP */ 0xFFF0,
  54     /* OBRa*/ 0xFFF0,
  55     /* OBRb*/ 0xFF80,
  56     /* OBRc*/ 0xFF00,
  57     /* OBR2*/ 0xFE00,
  58
  59     /* O1R1*/ 0xFFF0,
  60     /* OMb */ 0xFF80,
  61     /* OMc */ 0xFF00,
  62     /* SIa */ 0xFE00,
  63
  64   /* MULSH */ 0xFF00,
  65   /* OPSR  */ 0xFFF8,   /* psrset/psrclr */
  66
  67     /* JC  */ 0,                /* JC,JU,JL don't appear in object */
  68     /* JU  */ 0,
  69     /* JL  */ 0,
  70     /* RSI */ 0,
  71     /* DO21*/ 0,
  72     /* OB2 */ 0                 /* OB2 won't appear in object.  */
  73 };
  74
  75 static const char *grname[] = {
  76  "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  77  "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15"
  78 };
  79
  80 static const char X[] = "??";
  81
  82 static const char *crname[] = {
  83   "psr",  "vbr", "epsr", "fpsr", "epc",  "fpc",  "ss0",  "ss1",
  84   "ss2",  "ss3", "ss4",  "gcr",  "gsr",     X,      X,      X,
  85      X,      X,      X,      X,      X,     X,      X,      X,
  86      X,      X,      X,      X,      X,     X,      X,      X
  87 };
  88
  89 static const unsigned isiz[] = { 2, 0, 1, 0 };
  90
  91 int
  92 print_insn_mcore (memaddr, info)
  93      bfd_vma memaddr;
  94      struct disassemble_info *info;
  95 {
  96   unsigned char ibytes[4];
  97   fprintf_ftype fprintf = info->fprintf_func;
  98   void *stream = info->stream;
  99   unsigned short inst;
 100   const mcore_opcode_info *op;
 101   int status;
 102
 103   info->bytes_per_chunk = 2;
 104
 105   status = info->read_memory_func (memaddr, ibytes, 2, info);
 106
 107   if (status != 0)
 108     {
 109       info->memory_error_func (status, memaddr, info);
 110       return -1;
 111     }
 112
 113   if (info->endian == BFD_ENDIAN_BIG)
 114     inst = (ibytes[0] << 8) | ibytes[1];
 115   else if (info->endian == BFD_ENDIAN_LITTLE)
 116     inst = (ibytes[1] << 8) | ibytes[0];
 117   else
 118     abort ();
 119
 120   /* Just a linear search of the table.  */
 121   for (op = mcore_table; op->name != 0; op++)
 122     if (op->inst == (inst & imsk[op->opclass]))
 123       break;
 124
 125   if (op->name == 0)
 126     (*fprintf) (stream, ".short 0x%04x", inst);
 127   else
 128     {
 129       const char *name = grname[inst & 0x0F];
 130
 131       (*fprintf) (stream, "%s", op->name);
 132
 133       switch (op->opclass)
 134         {
 135         case O0:
 136           break;
 137
 138         case OT:
 139           (*fprintf) (stream, "\t%d", inst & 0x3);
 140           break;
 141
 142         case O1:
 143         case JMP:
 144         case JSR:
 145           (*fprintf) (stream, "\t%s", name);
 146           break;
 147
 148         case OC:
 149           (*fprintf) (stream, "\t%s, %s", name, crname[(inst >> 4) & 0x1F]);
 150           break;
 151
 152         case O1R1:
 153           (*fprintf) (stream, "\t%s, r1", name);
 154           break;
 155
 156         case MULSH:
 157         case O2:
 158           (*fprintf) (stream, "\t%s, %s", name, grname[(inst >> 4) & 0xF]);
 159           break;
 160
 161         case X1:
 162           (*fprintf) (stream, "\tr1, %s", name);
 163           break;
 164
 165         case OI:
 166           (*fprintf) (stream, "\t%s, %d", name, ((inst >> 4) & 0x1F) + 1);
 167           break;
 168
 169         case RM:
 170           (*fprintf) (stream, "\t%s-r15, (r0)", name);
 171           break;
 172
 173         case RQ:
 174           (*fprintf) (stream, "\tr4-r7, (%s)", name);
 175           break;
 176
 177         case OB:
 178         case OBRa:
 179         case OBRb:
 180         case OBRc:
 181         case SI:
 182         case SIa:
 183         case OMa:
 184         case OMb:
 185         case OMc:
 186           (*fprintf) (stream, "\t%s, %d", name, (inst >> 4) & 0x1F);
 187           break;
 188
 189         case I7:
 190           (*fprintf) (stream, "\t%s, %d", name, (inst >> 4) & 0x7F);
 191           break;
 192
 193         case LS:
 194           (*fprintf) (stream, "\t%s, (%s, %d)", grname[(inst >> 8) & 0xF],
 195                       name, ((inst >> 4) & 0xF) << isiz[(inst >> 13) & 3]);
 196           break;
 197
 198         case BR:
 199           {
 200             long val = inst & 0x3FF;
 201
 202             if (inst & 0x400)
 203               val |= 0xFFFFFC00;
 204
 205             (*fprintf) (stream, "\t0x%lx", (long)(memaddr + 2 + (val << 1)));
 206
 207             if (strcmp (op->name, "bsr") == 0)
 208               {
 209                 /* For bsr, we'll try to get a symbol for the target.  */
 210                 val = memaddr + 2 + (val << 1);
 211
 212                 if (info->print_address_func && val != 0)
 213                   {
 214                     (*fprintf) (stream, "\t// ");
 215                     info->print_address_func (val, info);
 216                   }
 217               }
 218           }
 219           break;
 220
 221         case BL:
 222           {
 223             long val;
 224             val = (inst & 0x000F);
 225             (*fprintf) (stream, "\t%s, 0x%lx",
 226                         grname[(inst >> 4) & 0xF],
 227                         (long) (memaddr - (val << 1)));
 228           }
 229           break;
 230
 231         case LR:
 232           {
 233             unsigned long val;
 234
 235             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 236
 237             status = info->read_memory_func (val, ibytes, 4, info);
 238             if (status != 0)
 239               {
 240                 info->memory_error_func (status, memaddr, info);
 241                 break;
 242               }
 243
 244             if (info->endian == BFD_ENDIAN_LITTLE)
 245               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 246                 | (ibytes[1] << 8) | (ibytes[0]);
 247             else
 248               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 249                 | (ibytes[2] << 8) | (ibytes[3]);
 250
 251             /* Removed [] around literal value to match ABI syntax 12/95.  */
 252             (*fprintf) (stream, "\t%s, 0x%lX", grname[(inst >> 8) & 0xF], val);
 253
 254             if (val == 0)
 255               (*fprintf) (stream, "\t// from address pool at 0x%lx",
 256                           (long) (memaddr + 2
 257                                   + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 258           }
 259           break;
 260
 261         case LJ:
 262           {
 263             unsigned long val;
 264
 265             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 266
 267             status = info->read_memory_func (val, ibytes, 4, info);
 268             if (status != 0)
 269               {
 270                 info->memory_error_func (status, memaddr, info);
 271                 break;
 272               }
 273
 274             if (info->endian == BFD_ENDIAN_LITTLE)
 275               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 276                 | (ibytes[1] << 8) | (ibytes[0]);
 277             else
 278               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 279                 | (ibytes[2] << 8) | (ibytes[3]);
 280
 281             /* Removed [] around literal value to match ABI syntax 12/95.  */
 282             (*fprintf) (stream, "\t0x%lX", val);
 283             /* For jmpi/jsri, we'll try to get a symbol for the target.  */
 284             if (info->print_address_func && val != 0)
 285               {
 286                 (*fprintf) (stream, "\t// ");
 287                 info->print_address_func (val, info);
 288               }
 289             else
 290               {
 291                 (*fprintf) (stream, "\t// from address pool at 0x%lx",
 292                             (long) (memaddr + 2
 293                                     + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 294               }
 295           }
 296           break;
 297
 298         case OPSR:
 299           {
 300             static char *fields[] = {
 301               "af", "ie",    "fe",    "fe,ie",
 302               "ee", "ee,ie", "ee,fe", "ee,fe,ie"
 303             };
 304
 305             (*fprintf) (stream, "\t%s", fields[inst & 0x7]);
 306           }
 307           break;
 308
 309         default:
 310           /* If the disassembler lags the instruction set.  */
 311           (*fprintf) (stream, "\tundecoded operands, inst is 0x%04x", inst);
 312           break;
 313         }
 314     }
 315
 316   /* Say how many bytes we consumed.  */
 317   return 2;
 318 }