opcodes/h8300-dis.c

   1 /* Disassemble h8300 instructions.
   2    Copyright (C) 1993, 1998 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 #include "opintl.h"
  24
  25
  26 /* Run through the opcodes and sort them into order to make them easy
  27    to disassemble
  28  */
  29 static void
  30 bfd_h8_disassemble_init ()
  31 {
  32   unsigned int i;
  33
  34
  35   struct h8_opcode *p;
  36
  37   for (p = h8_opcodes; p->name; p++)
  38     {
  39       int n1 = 0;
  40       int n2 = 0;
  41
  42       if ((int) p->data.nib[0] < 16)
  43         {
  44           n1 = (int) p->data.nib[0];
  45         }
  46       else
  47         n1 = 0;
  48       if ((int) p->data.nib[1] < 16)
  49         {
  50           n2 = (int) p->data.nib[1];
  51         }
  52       else
  53         n2 = 0;
  54
  55       /* Just make sure there are an even number of nibbles in it, and
  56          that the count is the same s the length */
  57       for (i = 0; p->data.nib[i] != E; i++)
  58         /*EMPTY*/ ;
  59       if (i & 1)
  60         abort ();
  61       p->length = i / 2;
  62     }
  63
  64 }
  65
  66
  67 unsigned int
  68 bfd_h8_disassemble (addr, info, mode)
  69      bfd_vma addr;
  70      disassemble_info *info;
  71      int mode;
  72 {
  73   /* Find the first entry in the table for this opcode */
  74   static CONST char *regnames[] =
  75     {
  76       "r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
  77       "r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l"};
  78
  79   static CONST char *wregnames[] =
  80     {
  81       "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  82       "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7"
  83       };
  84
  85   static CONST char *lregnames[] =
  86     {
  87       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7",
  88       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7"
  89       }
  90   ;
  91
  92   int rs = 0;
  93   int rd = 0;
  94   int rdisp = 0;
  95   int abs = 0;
  96   int bit = 0;
  97   int plen = 0;
  98   static boolean init = 0;
  99   struct h8_opcode *q = h8_opcodes;
 100   char CONST **pregnames = mode != 0 ? lregnames : wregnames;
 101   int status;
 102   int l;
 103
 104   unsigned char data[20];
 105   void *stream = info->stream;
 106   fprintf_ftype fprintf = info->fprintf_func;
 107
 108   if (!init)
 109     {
 110       bfd_h8_disassemble_init ();
 111       init = 1;
 112     }
 113
 114   status = info->read_memory_func(addr, data, 2, info);
 115   if (status != 0)
 116     {
 117       info->memory_error_func(status, addr, info);
 118       return -1;
 119     }
 120   for (l = 2; status == 0 && l < 10; l+=2)
 121     {
 122       status = info->read_memory_func(addr+l, data+l, 2, info);
 123     }
 124
 125
 126
 127   /* Find the exact opcode/arg combo */
 128   while (q->name)
 129     {
 130       op_type *nib;
 131       unsigned int len = 0;
 132
 133       nib = q->data.nib;
 134
 135       while (1)
 136         {
 137           op_type looking_for = *nib;
 138           int thisnib = data[len >> 1];
 139
 140           thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib >> 4) & 0xf);
 141
 142           if (looking_for < 16 && looking_for >=0)
 143             {
 144
 145               if (looking_for != thisnib)
 146                 goto fail;
 147             }
 148
 149           else
 150             {
 151
 152               if ((int) looking_for & (int) B31)
 153                 {
 154                   if (! (((int) thisnib & 0x8) != 0))
 155                     goto fail;
 156                   looking_for = (op_type) ((int) looking_for & ~(int) B31);
 157                 }
 158               if ((int) looking_for & (int) B30)
 159                 {
 160                   if (!(((int) thisnib & 0x8) == 0))
 161                     goto fail;
 162                   looking_for = (op_type) ((int) looking_for & ~(int) B30);
 163                 }
 164
 165               if (looking_for & DBIT)
 166                 {
 167                   if ((looking_for & 5) != (thisnib &5)) goto fail;
 168                   abs = (thisnib & 0x8) ? 2 : 1;
 169                 }
 170
 171               else  if (looking_for & (REG | IND|INC|DEC))
 172                 {
 173                   if (looking_for & SRC)
 174                     {
 175                       rs = thisnib;
 176                     }
 177                   else
 178                     {
 179                       rd = thisnib;
 180                     }
 181                 }
 182               else if (looking_for & L_16)
 183                 {
 184                   abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
 185                   plen = 16;
 186
 187                 }
 188               else if(looking_for & ABSJMP)
 189                 {
 190                   abs =
 191                     (data[1] << 16)
 192                       | (data[2] << 8)
 193                         | (data[3]);
 194                 }
 195               else if(looking_for & MEMIND)
 196                 {
 197                   abs = data[1];
 198                 }
 199               else if (looking_for & L_32)
 200                 {
 201                   int i = len >> 1;
 202                   abs = (data[i] << 24)
 203                     | (data[i + 1] << 16)
 204                       | (data[i + 2] << 8)
 205                         | (data[i+ 3]);
 206
 207                   plen =32;
 208
 209                 }
 210               else if (looking_for & L_24)
 211                 {
 212                   int i = len >> 1;
 213                   abs = (data[i] << 16) | (data[i + 1] << 8)|  (data[i+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 & MACREG)
 256                 {
 257                   abs = (thisnib == 3);
 258                 }
 259               else if (looking_for == E)
 260                 {
 261
 262                   {
 263                     int i;
 264
 265                     for (i = 0; i < q->length; i++)
 266                       {
 267                         fprintf (stream, "%02x ", data[i]);
 268                       }
 269                     for (; i < 6; i++)
 270                       {
 271                         fprintf (stream, "   ");
 272                       }
 273                   }
 274                   fprintf (stream, "%s\t", q->name);
 275
 276                   /* Gross.  Disgusting.  */
 277                   if (strcmp (q->name, "ldm.l") == 0)
 278                     {
 279                       int count, high;
 280
 281                       count = (data[1] >> 4) & 0x3;
 282                       high = data[3] & 0x7;
 283
 284                       fprintf (stream, "@sp+,er%d-er%d", high - count, high);
 285                       return q->length;
 286                     }
 287
 288                   if (strcmp (q->name, "stm.l") == 0)
 289                     {
 290                       int count, low;
 291
 292                       count = (data[1] >> 4) & 0x3;
 293                       low = data[3] & 0x7;
 294
 295                       fprintf (stream, "er%d-er%d,@-sp", low, low + count);
 296                       return q->length;
 297                     }
 298
 299                   /* Fill in the args */
 300                   {
 301                     op_type *args = q->args.nib;
 302                     int hadone = 0;
 303
 304
 305                     while (*args != E)
 306                       {
 307                         int x = *args;
 308                         if (hadone)
 309                           fprintf (stream, ",");
 310
 311
 312                         if (x & L_3)
 313                           {
 314                             fprintf (stream, "#0x%x", (unsigned) bit);
 315                           }
 316                         else if (x & (IMM|KBIT|DBIT))
 317                           {
 318                             /* Bletch.  For shal #2,er0 and friends.  */
 319                             if (*(args+1) & SRC_IN_DST)
 320                               abs = 2;
 321
 322                             fprintf (stream, "#0x%x", (unsigned) abs);
 323                           }
 324                         else if (x & REG)
 325                           {
 326                             int rn = (x & DST) ? rd : rs;
 327                             switch (x & SIZE)
 328                               {
 329                               case L_8:
 330                                 fprintf (stream, "%s", regnames[rn]);
 331                                 break;
 332                               case L_16:
 333                                 fprintf (stream, "%s", wregnames[rn]);
 334                                 break;
 335                               case L_P:
 336                               case L_32:
 337                                 fprintf (stream, "%s", lregnames[rn]);
 338                                 break;
 339
 340                               }
 341                           }
 342                         else if (x & MACREG)
 343                           {
 344                             fprintf (stream, "mac%c", abs ? 'l' : 'h');
 345                           }
 346                         else if (x & INC)
 347                           {
 348                             fprintf (stream, "@%s+", pregnames[rs]);
 349                           }
 350                         else if (x & DEC)
 351                           {
 352                             fprintf (stream, "@-%s", pregnames[rd]);
 353                           }
 354
 355                         else if (x & IND)
 356                           {
 357                             int rn = (x & DST) ? rd : rs;
 358                             fprintf (stream, "@%s", pregnames[rn]);
 359                           }
 360
 361                         else if (x & ABS8MEM)
 362                           {
 363                             fprintf (stream, "@0x%x:8", (unsigned) abs);
 364                           }
 365
 366                         else if (x & (ABS|ABSJMP))
 367                           {
 368                             fprintf (stream, "@0x%x:%d", (unsigned) abs, plen);
 369                           }
 370
 371                         else if (x & MEMIND)
 372                           {
 373                             fprintf (stream, "@@%d (%x)", abs, abs);
 374                           }
 375
 376                         else if (x & PCREL)
 377                           {
 378                             if (x & L_16)
 379                               {
 380                                 abs  +=2;
 381                                 fprintf (stream, ".%s%d (%x)", (short) abs > 0 ? "+" : "", (short) abs,
 382                                          addr + (short) abs + 2);
 383                               }
 384                             else {
 385                               fprintf (stream, ".%s%d (%x)", (char) abs > 0 ? "+" : "", (char) abs,
 386                                        addr + (char) abs + 2);
 387                             }
 388                           }
 389                         else if (x & DISP)
 390                           {
 391                             fprintf (stream, "@(0x%x:%d,%s)", abs,plen, pregnames[rdisp]);
 392                           }
 393
 394                         else if (x & CCR)
 395                           {
 396                             fprintf (stream, "ccr");
 397                           }
 398                         else if (x & EXR)
 399                           {
 400                             fprintf (stream, "exr");
 401                           }
 402                         else
 403                           /* xgettext:c-format */
 404                           fprintf (stream, _("Hmmmm %x"), x);
 405                         hadone = 1;
 406                         args++;
 407                       }
 408                   }
 409                   return q->length;
 410                 }
 411
 412
 413               else
 414                 {
 415                   /* xgettext:c-format */
 416                   fprintf (stream, _("Don't understand %x \n"), looking_for);
 417                 }
 418             }
 419
 420           len++;
 421           nib++;
 422         }
 423
 424     fail:
 425       q++;
 426     }
 427
 428   /* Fell of the end */
 429   fprintf (stream, "%02x %02x        .word\tH'%x,H'%x",
 430            data[0], data[1],
 431            data[0], data[1]);
 432   return 2;
 433 }
 434
 435 int
 436 print_insn_h8300 (addr, info)
 437 bfd_vma addr;
 438 disassemble_info *info;
 439 {
 440   return bfd_h8_disassemble (addr, info , 0);
 441 }
 442
 443 int
 444 print_insn_h8300h (addr, info)
 445 bfd_vma addr;
 446 disassemble_info *info;
 447 {
 448   return bfd_h8_disassemble (addr, info , 1);
 449 }
 450
 451 int
 452 print_insn_h8300s (addr, info)
 453 bfd_vma addr;
 454 disassemble_info *info;
 455 {
 456   return bfd_h8_disassemble (addr, info , 2);
 457 }