opcodes/mcore-dis.c

   1 /* Disassemble Motorola M*Core instructions.
   2    Copyright (C) 1993-2020 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU opcodes library.
   5
   6    This library is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    It is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include <stdio.h>
  23 #include "libiberty.h"
  24 #define STATIC_TABLE
  25 #define DEFINE_TABLE
  26
  27 #include "mcore-opc.h"
  28 #include "disassemble.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 (bfd_vma memaddr,
  93                   struct disassemble_info *info)
  94 {
  95   unsigned char ibytes[4];
  96   fprintf_ftype print_func = info->fprintf_func;
  97   void *stream = info->stream;
  98   unsigned short inst;
  99   unsigned int i;
 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   if (info->endian == BFD_ENDIAN_BIG)
 113     inst = (ibytes[0] << 8) | ibytes[1];
 114   else if (info->endian == BFD_ENDIAN_LITTLE)
 115     inst = (ibytes[1] << 8) | ibytes[0];
 116   else
 117     abort ();
 118
 119   /* Just a linear search of the table.  */
 120   for (i = 0; i < ARRAY_SIZE (mcore_table); i++)
 121     if (mcore_table[i].inst == (inst & imsk[mcore_table[i].opclass]))
 122       break;
 123
 124   if (i == ARRAY_SIZE (mcore_table))
 125     (*print_func) (stream, ".short 0x%04x", inst);
 126   else
 127     {
 128       const char *name = grname[inst & 0x0F];
 129
 130       (*print_func) (stream, "%s", mcore_table[i].name);
 131
 132       switch (mcore_table[i].opclass)
 133         {
 134         case O0:
 135           break;
 136
 137         case OT:
 138           (*print_func) (stream, "\t%d", inst & 0x3);
 139           break;
 140
 141         case O1:
 142         case JMP:
 143         case JSR:
 144           (*print_func) (stream, "\t%s", name);
 145           break;
 146
 147         case OC:
 148           (*print_func) (stream, "\t%s, %s", name, crname[(inst >> 4) & 0x1F]);
 149           break;
 150
 151         case O1R1:
 152           (*print_func) (stream, "\t%s, r1", name);
 153           break;
 154
 155         case MULSH:
 156         case O2:
 157           (*print_func) (stream, "\t%s, %s", name, grname[(inst >> 4) & 0xF]);
 158           break;
 159
 160         case X1:
 161           (*print_func) (stream, "\tr1, %s", name);
 162           break;
 163
 164         case OI:
 165           (*print_func) (stream, "\t%s, %d", name, ((inst >> 4) & 0x1F) + 1);
 166           break;
 167
 168         case RM:
 169           (*print_func) (stream, "\t%s-r15, (r0)", name);
 170           break;
 171
 172         case RQ:
 173           (*print_func) (stream, "\tr4-r7, (%s)", name);
 174           break;
 175
 176         case OB:
 177         case OBRa:
 178         case OBRb:
 179         case OBRc:
 180         case SI:
 181         case SIa:
 182         case OMa:
 183         case OMb:
 184         case OMc:
 185           (*print_func) (stream, "\t%s, %d", name, (inst >> 4) & 0x1F);
 186           break;
 187
 188         case I7:
 189           (*print_func) (stream, "\t%s, %d", name, (inst >> 4) & 0x7F);
 190           break;
 191
 192         case LS:
 193           (*print_func) (stream, "\t%s, (%s, %d)", grname[(inst >> 8) & 0xF],
 194                          name, ((inst >> 4) & 0xF) << isiz[(inst >> 13) & 3]);
 195           break;
 196
 197         case BR:
 198           {
 199             uint32_t val = ((inst & 0x3FF) ^ 0x400) - 0x400;
 200
 201             val = memaddr + 2 + (val << 1);
 202             (*print_func) (stream, "\t0x%x", val);
 203
 204             if (strcmp (mcore_table[i].name, "bsr") == 0)
 205               {
 206                 /* For bsr, we'll try to get a symbol for the target.  */
 207                 if (info->print_address_func && val != 0)
 208                   {
 209                     (*print_func) (stream, "\t// ");
 210                     info->print_address_func (val, info);
 211                   }
 212               }
 213           }
 214           break;
 215
 216         case BL:
 217           {
 218             uint32_t val = inst & 0x000F;
 219             (*print_func) (stream, "\t%s, 0x%x",
 220                            grname[(inst >> 4) & 0xF],
 221                            (uint32_t) (memaddr - (val << 1)));
 222           }
 223           break;
 224
 225         case LR:
 226           {
 227             uint32_t val;
 228
 229             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & ~3;
 230
 231             /* We are not reading an instruction, so allow
 232                reads to extend beyond the next symbol.  */
 233             info->stop_vma = 0;
 234             status = info->read_memory_func (val, ibytes, 4, info);
 235             if (status != 0)
 236               {
 237                 info->memory_error_func (status, memaddr, info);
 238                 break;
 239               }
 240
 241             if (info->endian == BFD_ENDIAN_LITTLE)
 242               val = (((unsigned) ibytes[3] << 24) | (ibytes[2] << 16)
 243                      | (ibytes[1] << 8) | (ibytes[0]));
 244             else
 245               val = (((unsigned) ibytes[0] << 24) | (ibytes[1] << 16)
 246                      | (ibytes[2] << 8) | (ibytes[3]));
 247
 248             /* Removed [] around literal value to match ABI syntax 12/95.  */
 249             (*print_func) (stream, "\t%s, 0x%X", grname[(inst >> 8) & 0xF], val);
 250
 251             if (val == 0)
 252               (*print_func) (stream, "\t// from address pool at 0x%x",
 253                              (uint32_t) (memaddr + 2
 254                                          + ((inst & 0xFF) << 2)) & ~3);
 255           }
 256           break;
 257
 258         case LJ:
 259           {
 260             uint32_t val;
 261
 262             val = (memaddr + 2 + ((inst & 0xFF) << 2)) & ~3;
 263
 264             /* We are not reading an instruction, so allow
 265                reads to extend beyond the next symbol.  */
 266             info->stop_vma = 0;
 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 = (((unsigned) ibytes[3] << 24) | (ibytes[2] << 16)
 276                      | (ibytes[1] << 8) | (ibytes[0]));
 277             else
 278               val = (((unsigned) 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             (*print_func) (stream, "\t0x%X", 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                 (*print_func) (stream, "\t// ");
 287                 info->print_address_func (val, info);
 288               }
 289             else
 290               {
 291                 (*print_func) (stream, "\t// from address pool at 0x%x",
 292                                (uint32_t) (memaddr + 2
 293                                            + ((inst & 0xFF) << 2)) & ~3);
 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             (*print_func) (stream, "\t%s", fields[inst & 0x7]);
 306           }
 307           break;
 308
 309         default:
 310           /* If the disassembler lags the instruction set.  */
 311           (*print_func) (stream, "\tundecoded operands, inst is 0x%04x", inst);
 312           break;
 313         }
 314     }
 315
 316   /* Say how many bytes we consumed.  */
 317   return 2;
 318 }