gnu/dist/gdb6/opcodes/mcore-dis.c

   1 /* Disassemble Motorola M*Core instructions.
   2    Copyright 1993, 1999, 2000, 2001, 2002 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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     /* O0  */ 0xFFFF,
  29     /* OT  */ 0xFFFC,
  30     /* O1  */ 0xFFF0,
  31     /* OC  */ 0xFE00,
  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  "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  73  "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15"
  74 };
  75
  76 static const char X[] = "??";
  77
  78 static const char *crname[] = {
  79   "psr",  "vbr", "epsr", "fpsr", "epc",  "fpc",  "ss0",  "ss1",
  80   "ss2",  "ss3", "ss4",  "gcr",  "gsr",     X,      X,      X,
  81      X,      X,      X,      X,      X,     X,      X,      X,
  82      X,      X,      X,      X,      X,     X,      X,      X
  83 };
  84
  85 static const unsigned isiz[] = { 2, 0, 1, 0 };
  86
  87 int
  88 print_insn_mcore (memaddr, info)
  89      bfd_vma memaddr;
  90      struct disassemble_info *info;
  91 {
  92   unsigned char ibytes[4];
  93   fprintf_ftype fprintf = info->fprintf_func;
  94   void *stream = info->stream;
  95   unsigned short inst;
  96   const mcore_opcode_info *op;
  97   int status;
  98
  99   info->bytes_per_chunk = 2;
 100
 101   status = info->read_memory_func (memaddr, ibytes, 2, info);
 102
 103   if (status != 0)
 104     {
 105       info->memory_error_func (status, memaddr, info);
 106       return -1;
 107     }
 108
 109   if (info->endian == BFD_ENDIAN_BIG)
 110     inst = (ibytes[0] << 8) | ibytes[1];
 111   else if (info->endian == BFD_ENDIAN_LITTLE)
 112     inst = (ibytes[1] << 8) | ibytes[0];
 113   else
 114     abort ();
 115
 116   /* Just a linear search of the table.  */
 117   for (op = mcore_table; op->name != 0; op++)
 118     if (op->inst == (inst & imsk[op->opclass]))
 119       break;
 120
 121   if (op->name == 0)
 122     fprintf (stream, ".short 0x%04x", inst);
 123   else
 124     {
 125       const char *name = grname[inst & 0x0F];
 126
 127       fprintf (stream, "%s", op->name);
 128
 129       switch (op->opclass)
 130         {
 131         case O0:
 132           break;
 133
 134         case OT:
 135           fprintf (stream, "\t%d", inst & 0x3);
 136           break;
 137
 138         case O1:
 139         case JMP:
 140         case JSR:
 141           fprintf (stream, "\t%s", name);
 142           break;
 143
 144         case OC:
 145           fprintf (stream, "\t%s, %s", name, crname[(inst >> 4) & 0x1F]);
 146           break;
 147
 148         case O1R1:
 149           fprintf (stream, "\t%s, r1", name);
 150           break;
 151
 152         case MULSH:
 153         case O2:
 154           fprintf (stream, "\t%s, %s", name, grname[(inst >> 4) & 0xF]);
 155           break;
 156
 157         case X1:
 158           fprintf (stream, "\tr1, %s", name);
 159           break;
 160
 161         case OI:
 162           fprintf (stream, "\t%s, %d", name, ((inst >> 4) & 0x1F) + 1);
 163           break;
 164
 165         case RM:
 166           fprintf (stream, "\t%s-r15, (r0)", name);
 167           break;
 168
 169         case RQ:
 170           fprintf (stream, "\tr4-r7, (%s)", name);
 171           break;
 172
 173         case OB:
 174         case OBRa:
 175         case OBRb:
 176         case OBRc:
 177         case SI:
 178         case SIa:
 179         case OMa:
 180         case OMb:
 181         case OMc:
 182           fprintf (stream, "\t%s, %d", name, (inst >> 4) & 0x1F);
 183           break;
 184
 185         case I7:
 186           fprintf (stream, "\t%s, %d", name, (inst >> 4) & 0x7F);
 187           break;
 188
 189         case LS:
 190           fprintf (stream, "\t%s, (%s, %d)", grname[(inst >> 8) & 0xF],
 191                    name, ((inst >> 4) & 0xF) << isiz[(inst >> 13) & 3]);
 192           break;
 193
 194         case BR:
 195           {
 196             long val = inst & 0x3FF;
 197
 198             if (inst & 0x400)
 199               val |= 0xFFFFFC00;
 200
 201             fprintf (stream, "\t0x%lx", (long)(memaddr + 2 + (val << 1)));
 202
 203             if (strcmp (op->name, "bsr") == 0)
 204               {
 205                 /* For bsr, we'll try to get a symbol for the target.  */
 206                 val = memaddr + 2 + (val << 1);
 207
 208                 if (info->print_address_func && val != 0)
 209                   {
 210                     fprintf (stream, "\t// ");
 211                     info->print_address_func (val, info);
 212                   }
 213               }
 214           }
 215           break;
 216
 217         case BL:
 218           {
 219             long val;
 220             val = (inst & 0x000F);
 221             fprintf (stream, "\t%s, 0x%lx",
 222                      grname[(inst >> 4) & 0xF], (long)(memaddr - (val << 1)));
 223           }
 224           break;
 225
 226         case LR:
 227           {
 228             unsigned long val;
 229
 230             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 231
 232             status = info->read_memory_func (val, ibytes, 4, info);
 233             if (status != 0)
 234               {
 235                 info->memory_error_func (status, memaddr, info);
 236                 break;
 237               }
 238
 239             if (info->endian == BFD_ENDIAN_LITTLE)
 240               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 241                 | (ibytes[1] << 8) | (ibytes[0]);
 242             else
 243               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 244                 | (ibytes[2] << 8) | (ibytes[3]);
 245
 246             /* Removed [] around literal value to match ABI syntax 12/95.  */
 247             fprintf (stream, "\t%s, 0x%lX", grname[(inst >> 8) & 0xF], val);
 248
 249             if (val == 0)
 250               fprintf (stream, "\t// from address pool at 0x%lx",
 251                        (long)(memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 252           }
 253           break;
 254
 255         case LJ:
 256           {
 257             unsigned long val;
 258
 259             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 260
 261             status = info->read_memory_func (val, ibytes, 4, info);
 262             if (status != 0)
 263               {
 264                 info->memory_error_func (status, memaddr, info);
 265                 break;
 266               }
 267
 268             if (info->endian == BFD_ENDIAN_LITTLE)
 269               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 270                 | (ibytes[1] << 8) | (ibytes[0]);
 271             else
 272               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 273                 | (ibytes[2] << 8) | (ibytes[3]);
 274
 275             /* Removed [] around literal value to match ABI syntax 12/95.  */
 276             fprintf (stream, "\t0x%lX", val);
 277             /* For jmpi/jsri, we'll try to get a symbol for the target.  */
 278             if (info->print_address_func && val != 0)
 279               {
 280                 fprintf (stream, "\t// ");
 281                 info->print_address_func (val, info);
 282               }
 283             else
 284               {
 285                 fprintf (stream, "\t// from address pool at 0x%lx",
 286                          (long)(memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 287               }
 288           }
 289           break;
 290
 291         case OPSR:
 292           {
 293             static char *fields[] = {
 294               "af", "ie",    "fe",    "fe,ie",
 295               "ee", "ee,ie", "ee,fe", "ee,fe,ie"
 296             };
 297
 298             fprintf (stream, "\t%s", fields[inst & 0x7]);
 299           }
 300           break;
 301
 302         default:
 303           /* If the disassembler lags the instruction set.  */
 304           fprintf (stream, "\tundecoded operands, inst is 0x%04x", inst);
 305           break;
 306         }
 307     }
 308
 309   /* Say how many bytes we consumed.  */
 310   return 2;
 311 }