opcodes/h8300-dis.c

   1 /* Disassemble h8300 instructions.
   2    Copyright 1993, 1994, 1996, 1998, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #define DEFINE_TABLE
  20
  21 #include "sysdep.h"
  22 #define h8_opcodes h8ops
  23 #include "opcode/h8300.h"
  24 #include "dis-asm.h"
  25 #include "opintl.h"
  26
  27 static void bfd_h8_disassemble_init PARAMS ((void));
  28 static unsigned int bfd_h8_disassemble
  29   PARAMS ((bfd_vma, disassemble_info *, int));
  30
  31 /* Run through the opcodes and sort them into order to make them easy
  32    to disassemble.  */
  33 static void
  34 bfd_h8_disassemble_init ()
  35 {
  36   unsigned int i;
  37   struct h8_opcode *p;
  38
  39   for (p = h8_opcodes; p->name; p++)
  40     {
  41       int n1 = 0;
  42       int n2 = 0;
  43
  44       if ((int) p->data.nib[0] < 16)
  45         n1 = (int) p->data.nib[0];
  46       else
  47         n1 = 0;
  48
  49       if ((int) p->data.nib[1] < 16)
  50         n2 = (int) p->data.nib[1];
  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 as the length.  */
  56       for (i = 0; p->data.nib[i] != E; i++)
  57         ;
  58
  59       if (i & 1)
  60         abort ();
  61
  62       p->length = i / 2;
  63     }
  64 }
  65
  66 static 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   static const char *lregnames[] =
  84     {
  85       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7",
  86       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7"
  87     };
  88   int rs = 0;
  89   int rd = 0;
  90   int rdisp = 0;
  91   int abs = 0;
  92   int bit = 0;
  93   int plen = 0;
  94   static boolean init = 0;
  95   struct h8_opcode *q;
  96   char const **pregnames = mode != 0 ? lregnames : wregnames;
  97   int status;
  98   int l;
  99   unsigned char data[20];
 100   void *stream = info->stream;
 101   fprintf_ftype fprintf = info->fprintf_func;
 102
 103   if (!init)
 104     {
 105       bfd_h8_disassemble_init ();
 106       init = 1;
 107     }
 108
 109   status = info->read_memory_func (addr, data, 2, info);
 110   if (status != 0)
 111     {
 112       info->memory_error_func (status, addr, info);
 113       return -1;
 114     }
 115
 116   for (l = 2; status == 0 && l < 10; l += 2)
 117     status = info->read_memory_func (addr + l, data + l, 2, info);
 118
 119   /* Find the exact opcode/arg combo.  */
 120   for (q = h8_opcodes; q->name; q++)
 121     {
 122       op_type *nib = q->data.nib;
 123       unsigned int len = 0;
 124
 125       while (1)
 126         {
 127           op_type looking_for = *nib;
 128           int thisnib = data[len >> 1];
 129
 130           thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib >> 4) & 0xf);
 131
 132           if (looking_for < 16 && looking_for >= 0)
 133             {
 134               if (looking_for != thisnib)
 135                 goto fail;
 136             }
 137           else
 138             {
 139               if ((int) looking_for & (int) B31)
 140                 {
 141                   if (!(((int) thisnib & 0x8) != 0))
 142                     goto fail;
 143
 144                   looking_for = (op_type) ((int) looking_for & ~(int) B31);
 145                 }
 146
 147               if ((int) looking_for & (int) B30)
 148                 {
 149                   if (!(((int) thisnib & 0x8) == 0))
 150                     goto fail;
 151
 152                   looking_for = (op_type) ((int) looking_for & ~(int) B30);
 153                 }
 154
 155               if (looking_for & DBIT)
 156                 {
 157                   /* Exclude adds/subs by looking at bit 0 and 2, and
 158                      make sure the operand size, either w or l,
 159                      matches by looking at bit 1.  */
 160                   if ((looking_for & 7) != (thisnib & 7))
 161                     goto fail;
 162
 163                   abs = (thisnib & 0x8) ? 2 : 1;
 164                 }
 165               else if (looking_for & (REG | IND | INC | DEC))
 166                 {
 167                   if (looking_for & SRC)
 168                     rs = thisnib;
 169                   else
 170                     rd = thisnib;
 171                 }
 172               else if (looking_for & L_16)
 173                 {
 174                   abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
 175                   plen = 16;
 176                 }
 177               else if (looking_for & ABSJMP)
 178                 {
 179                   abs = (data[1] << 16) | (data[2] << 8) | (data[3]);
 180                 }
 181               else if (looking_for & MEMIND)
 182                 {
 183                   abs = data[1];
 184                 }
 185               else if (looking_for & L_32)
 186                 {
 187                   int i = len >> 1;
 188
 189                   abs = (data[i] << 24)
 190                     | (data[i + 1] << 16)
 191                     | (data[i + 2] << 8)
 192                     | (data[i + 3]);
 193
 194                   plen = 32;
 195                 }
 196               else if (looking_for & L_24)
 197                 {
 198                   int i = len >> 1;
 199
 200                   abs = (data[i] << 16) | (data[i + 1] << 8) | (data[i + 2]);
 201                   plen = 24;
 202                 }
 203               else if (looking_for & IGNORE)
 204                 {
 205                   ;
 206                 }
 207               else if (looking_for & DISPREG)
 208                 {
 209                   rdisp = thisnib;
 210                 }
 211               else if (looking_for & KBIT)
 212                 {
 213                   switch (thisnib)
 214                     {
 215                     case 9:
 216                       abs = 4;
 217                       break;
 218                     case 8:
 219                       abs = 2;
 220                       break;
 221                     case 0:
 222                       abs = 1;
 223                       break;
 224                     default:
 225                       goto fail;
 226                     }
 227                 }
 228               else if (looking_for & L_8)
 229                 {
 230                   plen = 8;
 231                   abs = data[len >> 1];
 232                 }
 233               else if (looking_for & L_3)
 234                 {
 235                   bit = thisnib & 0x7;
 236                 }
 237               else if (looking_for & L_2)
 238                 {
 239                   plen = 2;
 240                   abs = thisnib & 0x3;
 241                 }
 242               else if (looking_for & MACREG)
 243                 {
 244                   abs = (thisnib == 3);
 245                 }
 246               else if (looking_for == E)
 247                 {
 248                   int i;
 249
 250                   for (i = 0; i < q->length; i++)
 251                     fprintf (stream, "%02x ", data[i]);
 252
 253                   for (; i < 6; i++)
 254                     fprintf (stream, "   ");
 255
 256                   fprintf (stream, "%s\t", q->name);
 257
 258                   /* Gross.  Disgusting.  */
 259                   if (strcmp (q->name, "ldm.l") == 0)
 260                     {
 261                       int count, high;
 262
 263                       count = (data[1] >> 4) & 0x3;
 264                       high = data[3] & 0x7;
 265
 266                       fprintf (stream, "@sp+,er%d-er%d", high - count, high);
 267                       return q->length;
 268                     }
 269
 270                   if (strcmp (q->name, "stm.l") == 0)
 271                     {
 272                       int count, low;
 273
 274                       count = (data[1] >> 4) & 0x3;
 275                       low = data[3] & 0x7;
 276
 277                       fprintf (stream, "er%d-er%d,@-sp", low, low + count);
 278                       return q->length;
 279                     }
 280
 281                   /* Fill in the args.  */
 282                   {
 283                     op_type *args = q->args.nib;
 284                     int hadone = 0;
 285
 286                     while (*args != E)
 287                       {
 288                         int x = *args;
 289
 290                         if (hadone)
 291                           fprintf (stream, ",");
 292
 293                         if (x & L_3)
 294                           {
 295                             fprintf (stream, "#0x%x", (unsigned) bit);
 296                           }
 297                         else if (x & (IMM | KBIT | DBIT))
 298                           {
 299                             /* Bletch.  For shal #2,er0 and friends.  */
 300                             if (*(args + 1) & SRC_IN_DST)
 301                               abs = 2;
 302
 303                             fprintf (stream, "#0x%x", (unsigned) abs);
 304                           }
 305                         else if (x & REG)
 306                           {
 307                             int rn = (x & DST) ? rd : rs;
 308
 309                             switch (x & SIZE)
 310                               {
 311                               case L_8:
 312                                 fprintf (stream, "%s", regnames[rn]);
 313                                 break;
 314                               case L_16:
 315                                 fprintf (stream, "%s", wregnames[rn]);
 316                                 break;
 317                               case L_P:
 318                               case L_32:
 319                                 fprintf (stream, "%s", lregnames[rn]);
 320                                 break;
 321                               }
 322                           }
 323                         else if (x & MACREG)
 324                           {
 325                             fprintf (stream, "mac%c", abs ? 'l' : 'h');
 326                           }
 327                         else if (x & INC)
 328                           {
 329                             fprintf (stream, "@%s+", pregnames[rs]);
 330                           }
 331                         else if (x & DEC)
 332                           {
 333                             fprintf (stream, "@-%s", pregnames[rd]);
 334                           }
 335                         else if (x & IND)
 336                           {
 337                             int rn = (x & DST) ? rd : rs;
 338                             fprintf (stream, "@%s", pregnames[rn]);
 339                           }
 340                         else if (x & ABS8MEM)
 341                           {
 342                             fprintf (stream, "@0x%x:8", (unsigned) abs);
 343                           }
 344                         else if (x & (ABS | ABSJMP))
 345                           {
 346                             fprintf (stream, "@0x%x:%d", (unsigned) abs, plen);
 347                           }
 348                         else if (x & MEMIND)
 349                           {
 350                             fprintf (stream, "@@%d (%x)", abs, abs);
 351                           }
 352                         else if (x & PCREL)
 353                           {
 354                             if (x & L_16)
 355                               {
 356                                 abs += 2;
 357                                 fprintf (stream,
 358                                          ".%s%d (%x)",
 359                                          (short) abs > 0 ? "+" : "",
 360                                          (short) abs, addr + (short) abs + 2);
 361                               }
 362                             else
 363                               {
 364                                 fprintf (stream,
 365                                          ".%s%d (%x)",
 366                                          (char) abs > 0 ? "+" : "",
 367                                          (char) abs, addr + (char) abs + 2);
 368                               }
 369                           }
 370                         else if (x & DISP)
 371                           {
 372                             fprintf (stream, "@(0x%x:%d,%s)",
 373                                      abs, plen, pregnames[rdisp]);
 374                           }
 375                         else if (x & CCR)
 376                           {
 377                             fprintf (stream, "ccr");
 378                           }
 379                         else if (x & EXR)
 380                           {
 381                             fprintf (stream, "exr");
 382                           }
 383                         else
 384                           /* xgettext:c-format */
 385                           fprintf (stream, _("Hmmmm %x"), x);
 386
 387                         hadone = 1;
 388                         args++;
 389                       }
 390                   }
 391
 392                   return q->length;
 393                 }
 394               else
 395                 /* xgettext:c-format */
 396                 fprintf (stream, _("Don't understand %x \n"), looking_for);
 397             }
 398
 399           len++;
 400           nib++;
 401         }
 402
 403     fail:
 404       ;
 405     }
 406
 407   /* Fell off the end.  */
 408   fprintf (stream, "%02x %02x        .word\tH'%x,H'%x",
 409            data[0], data[1],
 410            data[0], data[1]);
 411   return 2;
 412 }
 413
 414 int
 415 print_insn_h8300 (addr, info)
 416      bfd_vma addr;
 417      disassemble_info *info;
 418 {
 419   return bfd_h8_disassemble (addr, info, 0);
 420 }
 421
 422 int
 423 print_insn_h8300h (addr, info)
 424      bfd_vma addr;
 425      disassemble_info *info;
 426 {
 427   return bfd_h8_disassemble (addr, info, 1);
 428 }
 429
 430 int
 431 print_insn_h8300s (addr, info)
 432      bfd_vma addr;
 433      disassemble_info *info;
 434 {
 435   return bfd_h8_disassemble (addr, info, 2);
 436 }