opcodes/h8300-dis.c

   1 /* Disassemble h8300 instructions.
   2    Copyright (C) 1993 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 #define DEFINE_TABLE
  19
  20 #define h8_opcodes h8ops
  21 #include "opcode/h8300.h"
  22 #include "dis-asm.h"
  23
  24
  25 /* Run through the opcodes and sort them into order to make them easy
  26    to disassemble
  27  */
  28 static void
  29 bfd_h8_disassemble_init ()
  30 {
  31   unsigned int i;
  32
  33
  34   struct h8_opcode *p;
  35
  36   for (p = h8_opcodes; p->name; p++)
  37     {
  38       int n1 = 0;
  39       int n2 = 0;
  40
  41       if ((int) p->data.nib[0] < 16)
  42         {
  43           n1 = (int) p->data.nib[0];
  44         }
  45       else
  46         n1 = 0;
  47       if ((int) p->data.nib[1] < 16)
  48         {
  49           n2 = (int) p->data.nib[1];
  50         }
  51       else
  52         n2 = 0;
  53
  54       /* Just make sure there are an even number of nibbles in it, and
  55          that the count is the same s the length */
  56       for (i = 0; p->data.nib[i] != E; i++)
  57         /*EMPTY*/ ;
  58       if (i & 1)
  59         abort ();
  60       p->length = i / 2;
  61     }
  62
  63 }
  64
  65
  66 unsigned int
  67 bfd_h8_disassemble (addr, info, mode)
  68      bfd_vma addr;
  69      disassemble_info *info;
  70      int mode;
  71 {
  72   /* Find the first entry in the table for this opcode */
  73   static CONST char *regnames[] =
  74     {
  75       "r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
  76       "r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l"};
  77
  78   static CONST char *wregnames[] =
  79     {
  80       "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  81       "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7"
  82       };
  83
  84   static CONST char *lregnames[] =
  85     {
  86       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7",
  87       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7"
  88       }
  89   ;
  90
  91   int rs = 0;
  92   int rd = 0;
  93   int rdisp = 0;
  94   int abs = 0;
  95   int bit = 0;
  96   int plen = 0;
  97   static boolean init = 0;
  98   struct h8_opcode *q = h8_opcodes;
  99   char CONST **pregnames = mode != 0 ? lregnames : wregnames;
 100   int status;
 101   int l;
 102
 103   unsigned char data[20];
 104   void *stream = info->stream;
 105   fprintf_ftype fprintf = info->fprintf_func;
 106
 107   if (!init)
 108     {
 109       bfd_h8_disassemble_init ();
 110       init = 1;
 111     }
 112
 113   status = info->read_memory_func(addr, data, 2, info);
 114   if (status != 0)
 115     {
 116       info->memory_error_func(status, addr, info);
 117       return -1;
 118     }
 119   for (l = 2; status == 0 && l < 10; l+=2)
 120     {
 121       status = info->read_memory_func(addr+l, data+l, 2, info);
 122     }
 123
 124
 125
 126   /* Find the exact opcode/arg combo */
 127   while (q->name)
 128     {
 129       op_type *nib;
 130       unsigned int len = 0;
 131
 132       nib = q->data.nib;
 133
 134       while (1)
 135         {
 136           op_type looking_for = *nib;
 137           int thisnib = data[len >> 1];
 138
 139           thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib >> 4) & 0xf);
 140
 141           if (looking_for < 16 && looking_for >=0)
 142             {
 143
 144               if (looking_for != thisnib)
 145                 goto fail;
 146             }
 147
 148           else
 149             {
 150
 151               if ((int) looking_for & (int) B31)
 152                 {
 153                   if (! (((int) thisnib & 0x8) != 0))
 154                     goto fail;
 155                   looking_for = (op_type) ((int) looking_for & ~(int) B31);
 156                 }
 157               if ((int) looking_for & (int) B30)
 158                 {
 159                   if (!(((int) thisnib & 0x8) == 0))
 160                     goto fail;
 161                   looking_for = (op_type) ((int) looking_for & ~(int) B30);
 162                 }
 163
 164               if (looking_for & DBIT)
 165                 {
 166                   if ((looking_for & 5) != (thisnib &5)) goto fail;
 167                   abs = (thisnib & 0x8) ? 2 : 1;
 168                 }
 169
 170               else  if (looking_for & (REG | IND|INC|DEC))
 171                 {
 172                   if (looking_for & SRC)
 173                     {
 174                       rs = thisnib;
 175                     }
 176                   else
 177                     {
 178                       rd = thisnib;
 179                     }
 180                 }
 181               else if (looking_for & L_16)
 182                 {
 183                   abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
 184                   plen = 16;
 185
 186                 }
 187               else if(looking_for & ABSJMP)
 188                 {
 189                   abs =
 190                     (data[1] << 16)
 191                       | (data[2] << 8)
 192                         | (data[3]);
 193                 }
 194               else if(looking_for & MEMIND)
 195                 {
 196                   abs = data[1];
 197                 }
 198               else if (looking_for & L_32)
 199                 {
 200                   int i = len >> 1;
 201                   abs = (data[i] << 24)
 202                     | (data[i + 1] << 16)
 203                       | (data[i + 2] << 8)
 204                         | (data[i+ 3]);
 205
 206                   plen =32;
 207
 208                 }
 209               else if (looking_for & L_24)
 210                 {
 211                   int i = len >> 1;
 212                   abs = (data[i] << 16) | (data[i + 1] << 8)|  (data[i+
 213                                                                      2]);
 214                   plen =24;
 215                 }
 216               else if (looking_for & IGNORE)
 217                 {
 218
 219                 }
 220               else if (looking_for & DISPREG)
 221                 {
 222                   rdisp = thisnib;
 223                 }
 224               else if (looking_for & KBIT)
 225                 {
 226                   switch (thisnib)
 227                     {
 228                     case 9:
 229                       abs = 4;
 230                       break;
 231                     case 8:
 232                       abs = 2;
 233                       break;
 234                     case 0:
 235                       abs = 1;
 236                       break;
 237                     default:
 238                       goto fail;
 239                     }
 240                 }
 241               else if (looking_for & L_8)
 242                 {
 243                   plen = 8;
 244                   abs = data[len >> 1];
 245                 }
 246               else if (looking_for & L_3)
 247                 {
 248                   bit = thisnib & 0x7;
 249                 }
 250               else if (looking_for & L_2)
 251                 {
 252                   plen = 2;
 253                   abs = thisnib & 0x3;
 254                 }
 255               else if (looking_for == E)
 256                 {
 257
 258                   {
 259                     int i;
 260
 261                     for (i = 0; i < q->length; i++)
 262                       {
 263                         fprintf (stream, "%02x ", data[i]);
 264                       }
 265                     for (; i < 6; i++)
 266                       {
 267                         fprintf (stream, "   ");
 268                       }
 269                   }
 270                   fprintf (stream, "%s\t", q->name);
 271
 272                   /* Gross.  Disgusting.  */
 273                   if (strcmp (q->name, "ldm.l") == 0)
 274                     {
 275                       int count, high;
 276
 277                       count = (data[1] >> 4) & 0x3;
 278                       high = data[3] & 0x7;
 279
 280                       fprintf (stream, "@sp+,er%d-er%d", high - count, high);
 281                       return q->length;
 282                     }
 283
 284                   if (strcmp (q->name, "stm.l") == 0)
 285                     {
 286                       int count, low;
 287
 288                       count = (data[1] >> 4) & 0x3;
 289                       low = data[3] & 0x7;
 290
 291                       fprintf (stream, "er%d-er%d,@-sp", low, low + count);
 292                       return q->length;
 293                     }
 294
 295                   /* Fill in the args */
 296                   {
 297                     op_type *args = q->args.nib;
 298                     int hadone = 0;
 299
 300
 301                     while (*args != E)
 302                       {
 303                         int x = *args;
 304                         if (hadone)
 305                           fprintf (stream, ",");
 306
 307
 308                         if (x & L_3)
 309                           {
 310                             fprintf (stream, "#0x%x", (unsigned) bit);
 311                           }
 312                         else if (x & (IMM|KBIT|DBIT))
 313                           {
 314                             /* Bletch.  For shal #2,er0 and friends.  */
 315                             if (*(args+1) & SRC_IN_DST)
 316                               abs = 2;
 317
 318                             fprintf (stream, "#0x%x", (unsigned) abs);
 319                           }
 320                         else if (x & REG)
 321                           {
 322                             int rn = (x & DST) ? rd : rs;
 323                             switch (x & SIZE)
 324                               {
 325                               case L_8:
 326                                 fprintf (stream, "%s", regnames[rn]);
 327                                 break;
 328                               case L_16:
 329                                 fprintf (stream, "%s", wregnames[rn]);
 330                                 break;
 331                               case L_P:
 332                               case L_32:
 333                                 fprintf (stream, "%s", lregnames[rn]);
 334                                 break;
 335
 336                               }
 337                           }
 338
 339                         else if (x & INC)
 340                           {
 341                             fprintf (stream, "@%s+", pregnames[rs]);
 342                           }
 343                         else if (x & DEC)
 344                           {
 345                             fprintf (stream, "@-%s", pregnames[rd]);
 346                           }
 347
 348                         else if (x & IND)
 349                           {
 350                             int rn = (x & DST) ? rd : rs;
 351                             fprintf (stream, "@%s", pregnames[rn]);
 352                           }
 353
 354                         else if (x & ABS8MEM)
 355                           {
 356                             fprintf (stream, "@0x%x:8", (unsigned) abs);
 357                           }
 358
 359                         else if (x & (ABS|ABSJMP))
 360                           {
 361                             fprintf (stream, "@0x%x:%d", (unsigned) abs, plen);
 362                           }
 363
 364                         else if (x & MEMIND)
 365                           {
 366                             fprintf (stream, "@@%d (%x)", abs, abs);
 367                           }
 368
 369                         else if (x & PCREL)
 370                           {
 371                             if (x & L_16)
 372                               {
 373                                 abs  +=2;
 374                                 fprintf (stream, ".%s%d (%x)", (short) abs > 0 ? "+" : "", (short) abs,
 375                                          addr + (short) abs + 2);
 376                               }
 377                             else {
 378                               fprintf (stream, ".%s%d (%x)", (char) abs > 0 ? "+" : "", (char) abs,
 379                                        addr + (char) abs + 2);
 380                             }
 381                           }
 382                         else if (x & DISP)
 383                           {
 384                             fprintf (stream, "@(0x%x:%d,%s)", abs,plen, pregnames[rdisp]);
 385                           }
 386
 387                         else if (x & CCR)
 388                           {
 389                             fprintf (stream, "ccr");
 390                           }
 391                         else if (x & EXR)
 392                           {
 393                             fprintf (stream, "exr");
 394                           }
 395
 396                         else
 397                           fprintf (stream, "Hmmmm %x", x);
 398                         hadone = 1;
 399                         args++;
 400                       }
 401                   }
 402                   return q->length;
 403                 }
 404
 405
 406               else
 407                 {
 408                   fprintf (stream, "Dont understand %x \n", looking_for);
 409                 }
 410             }
 411
 412           len++;
 413           nib++;
 414         }
 415
 416     fail:
 417       q++;
 418     }
 419
 420   /* Fell of the end */
 421   fprintf (stream, "%02x %02x        .word\tH'%x,H'%x",
 422            data[0], data[1],
 423            data[0], data[1]);
 424   return 2;
 425 }
 426
 427 int
 428 print_insn_h8300 (addr, info)
 429 bfd_vma addr;
 430 disassemble_info *info;
 431 {
 432   return bfd_h8_disassemble (addr, info , 0);
 433 }
 434
 435 int
 436 print_insn_h8300h (addr, info)
 437 bfd_vma addr;
 438 disassemble_info *info;
 439 {
 440   return bfd_h8_disassemble (addr, info , 1);
 441 }
 442
 443 int
 444 print_insn_h8300s (addr, info)
 445 bfd_vma addr;
 446 disassemble_info *info;
 447 {
 448   return bfd_h8_disassemble (addr, info , 2);
 449 }