opcodes/mcore-dis.c

   1 /* Disassemble Motorola M*Core instructions.
   2    Copyright 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     /* 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   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: break;
 132         case OT: fprintf (stream, "\t%d", inst & 0x3); break;
 133         case O1:
 134         case JMP:
 135         case JSR: fprintf (stream, "\t%s", name); break;
 136         case OC:  fprintf (stream, "\t%s, %s", name, crname[(inst >> 4) & 0x1F]); break;
 137         case O1R1: fprintf (stream, "\t%s, r1", name); break;
 138         case MULSH:
 139         case O2: fprintf (stream, "\t%s, %s", name, grname[(inst >> 4) & 0xF]); break;
 140         case X1: fprintf (stream, "\tr1, %s", name); break;
 141         case OI: fprintf (stream, "\t%s, %d", name, ((inst >> 4) & 0x1F) + 1); break;
 142         case RM: fprintf (stream, "\t%s-r15, (r0)", name); break;
 143         case RQ: fprintf (stream, "\tr4-r7, (%s)", name); break;
 144         case OB:
 145         case OBRa:
 146         case OBRb:
 147         case OBRc:
 148         case SI:
 149         case SIa:
 150         case OMa:
 151         case OMb:
 152         case OMc: fprintf (stream, "\t%s, %d", name, (inst >> 4) & 0x1F); break;
 153         case I7: fprintf (stream, "\t%s, %d", name, (inst >> 4) & 0x7F); break;
 154         case LS: fprintf (stream, "\t%s, (%s, %d)", grname[(inst >> 8) & 0xF],
 155                           name, ((inst >> 4) & 0xF) << isiz[(inst >> 13) & 3]);
 156           break;
 157
 158         case BR:
 159           {
 160             long val = inst & 0x3FF;
 161
 162             if (inst & 0x400)
 163               val |= 0xFFFFFC00;
 164
 165             fprintf (stream, "\t0x%x", memaddr + 2 + (val << 1));
 166
 167             if (strcmp (op->name, "bsr") == 0)
 168               {
 169                 /* For bsr, we'll try to get a symbol for the target.  */
 170                 val = memaddr + 2 + (val << 1);
 171
 172                 if (info->print_address_func && val != 0)
 173                   {
 174                     fprintf (stream, "\t// ");
 175                     info->print_address_func (val, info);
 176                   }
 177               }
 178           }
 179           break;
 180
 181         case BL:
 182           {
 183             long val;
 184             val = (inst & 0x000F);
 185             fprintf (stream, "\t%s, 0x%x",
 186                      grname[(inst >> 4) & 0xF], memaddr - (val << 1));
 187           }
 188           break;
 189
 190         case LR:
 191           {
 192             unsigned long val;
 193
 194             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 195
 196             status = info->read_memory_func (val, ibytes, 4, info);
 197             if (status != 0)
 198               {
 199                 info->memory_error_func (status, memaddr, info);
 200                 break;
 201               }
 202
 203             if (info->endian == BFD_ENDIAN_LITTLE)
 204               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 205                 | (ibytes[1] << 8) | (ibytes[0]);
 206             else
 207               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 208                 | (ibytes[2] << 8) | (ibytes[3]);
 209
 210             /* Removed [] around literal value to match ABI syntax 12/95.  */
 211             fprintf (stream, "\t%s, 0x%X", grname[(inst >> 8) & 0xF], val);
 212
 213             if (val == 0)
 214               fprintf (stream, "\t// from address pool at 0x%x",
 215                        (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 216           }
 217           break;
 218
 219         case LJ:
 220           {
 221             unsigned long val;
 222
 223             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
 224
 225             status = info->read_memory_func (val, ibytes, 4, info);
 226             if (status != 0)
 227               {
 228                 info->memory_error_func (status, memaddr, info);
 229                 break;
 230               }
 231
 232             if (info->endian == BFD_ENDIAN_LITTLE)
 233               val = (ibytes[3] << 24) | (ibytes[2] << 16)
 234                 | (ibytes[1] << 8) | (ibytes[0]);
 235             else
 236               val = (ibytes[0] << 24) | (ibytes[1] << 16)
 237                 | (ibytes[2] << 8) | (ibytes[3]);
 238
 239             /* Removed [] around literal value to match ABI syntax 12/95.  */
 240             fprintf (stream, "\t0x%X", val);
 241             /* For jmpi/jsri, we'll try to get a symbol for the target.  */
 242             if (info->print_address_func && val != 0)
 243               {
 244                 fprintf (stream, "\t// ");
 245                 info->print_address_func (val, info);
 246               }
 247             else
 248               {
 249                 fprintf (stream, "\t// from address pool at 0x%x",
 250                          (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
 251               }
 252           }
 253           break;
 254
 255         case OPSR:
 256           {
 257             static char *fields[] = {
 258               "af", "ie",    "fe",    "fe,ie",
 259               "ee", "ee,ie", "ee,fe", "ee,fe,ie"
 260             };
 261
 262             fprintf (stream, "\t%s", fields[inst & 0x7]);
 263           }
 264           break;
 265
 266         default:
 267           /* If the disassembler lags the instruction set.  */
 268           fprintf (stream, "\tundecoded operands, inst is 0x%04x", inst);
 269           break;
 270         }
 271     }
 272
 273   /* Say how many bytes we consumed.  */
 274   return 2;
 275 }