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 #include "libiberty.h"
  27
  28 struct h8_instruction
  29 {
  30   int length;
  31   const struct h8_opcode *opcode;
  32 };
  33
  34 struct h8_instruction *h8_instructions;
  35
  36 static void bfd_h8_disassemble_init PARAMS ((void));
  37 static unsigned int bfd_h8_disassemble
  38   PARAMS ((bfd_vma, disassemble_info *, int));
  39
  40 /* Run through the opcodes and sort them into order to make them easy
  41    to disassemble.  */
  42 static void
  43 bfd_h8_disassemble_init ()
  44 {
  45   unsigned int i;
  46   unsigned int nopcodes;
  47   const struct h8_opcode *p;
  48   struct h8_instruction *pi;
  49
  50   nopcodes = sizeof (h8_opcodes) / sizeof (struct h8_opcode);
  51
  52   h8_instructions = (struct h8_instruction *)
  53     xmalloc (nopcodes * sizeof (struct h8_instruction));
  54
  55   for (p = h8_opcodes, pi = h8_instructions; p->name; p++, pi++)
  56     {
  57       int n1 = 0;
  58       int n2 = 0;
  59
  60       if ((int) p->data.nib[0] < 16)
  61         n1 = (int) p->data.nib[0];
  62       else
  63         n1 = 0;
  64
  65       if ((int) p->data.nib[1] < 16)
  66         n2 = (int) p->data.nib[1];
  67       else
  68         n2 = 0;
  69
  70       /* Just make sure there are an even number of nibbles in it, and
  71          that the count is the same as the length.  */
  72       for (i = 0; p->data.nib[i] != E; i++)
  73         ;
  74
  75       if (i & 1)
  76         abort ();
  77
  78       pi->length = i / 2;
  79       pi->opcode = p;
  80     }
  81
  82   /* Add entry for the NULL vector terminator.  */
  83   pi->length = 0;
  84   pi->opcode = p;
  85 }
  86
  87 static unsigned int
  88 bfd_h8_disassemble (addr, info, mode)
  89      bfd_vma addr;
  90      disassemble_info *info;
  91      int mode;
  92 {
  93   /* Find the first entry in the table for this opcode.  */
  94   static const char *regnames[] =
  95     {
  96       "r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
  97       "r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l"
  98     };
  99   static const char *wregnames[] =
 100     {
 101       "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
 102       "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7"
 103     };
 104   static const char *lregnames[] =
 105     {
 106       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7",
 107       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7"
 108     };
 109   int rs = 0;
 110   int rd = 0;
 111   int rdisp = 0;
 112   int abs = 0;
 113   int bit = 0;
 114   int plen = 0;
 115   static bfd_boolean init = 0;
 116   const struct h8_instruction *qi;
 117   char const **pregnames = mode != 0 ? lregnames : wregnames;
 118   int status;
 119   int l;
 120   unsigned char data[20];
 121   void *stream = info->stream;
 122   fprintf_ftype fprintf = info->fprintf_func;
 123
 124   if (!init)
 125     {
 126       bfd_h8_disassemble_init ();
 127       init = 1;
 128     }
 129
 130   status = info->read_memory_func (addr, data, 2, info);
 131   if (status != 0)
 132     {
 133       info->memory_error_func (status, addr, info);
 134       return -1;
 135     }
 136
 137   for (l = 2; status == 0 && l < 10; l += 2)
 138     status = info->read_memory_func (addr + l, data + l, 2, info);
 139
 140   /* Find the exact opcode/arg combo.  */
 141   for (qi = h8_instructions; qi->opcode->name; qi++)
 142     {
 143       const struct h8_opcode *q = qi->opcode;
 144       op_type *nib = q->data.nib;
 145       unsigned int len = 0;
 146
 147       while (1)
 148         {
 149           op_type looking_for = *nib;
 150           int thisnib = data[len >> 1];
 151
 152           thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib >> 4) & 0xf);
 153
 154           if (looking_for < 16 && looking_for >= 0)
 155             {
 156               if (looking_for != thisnib)
 157                 goto fail;
 158             }
 159           else
 160             {
 161               if ((int) looking_for & (int) B31)
 162                 {
 163                   if (!(((int) thisnib & 0x8) != 0))
 164                     goto fail;
 165
 166                   looking_for = (op_type) ((int) looking_for & ~(int) B31);
 167                 }
 168
 169               if ((int) looking_for & (int) B30)
 170                 {
 171                   if (!(((int) thisnib & 0x8) == 0))
 172                     goto fail;
 173
 174                   looking_for = (op_type) ((int) looking_for & ~(int) B30);
 175                 }
 176
 177               if (looking_for & DBIT)
 178                 {
 179                   /* Exclude adds/subs by looking at bit 0 and 2, and
 180                      make sure the operand size, either w or l,
 181                      matches by looking at bit 1.  */
 182                   if ((looking_for & 7) != (thisnib & 7))
 183                     goto fail;
 184
 185                   abs = (thisnib & 0x8) ? 2 : 1;
 186                 }
 187               else if (looking_for & (REG | IND | INC | DEC))
 188                 {
 189                   if (looking_for & SRC)
 190                     rs = thisnib;
 191                   else
 192                     rd = thisnib;
 193                 }
 194               else if (looking_for & L_16)
 195                 {
 196                   abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
 197                   plen = 16;
 198                 }
 199               else if (looking_for & ABSJMP)
 200                 {
 201                   abs = (data[1] << 16) | (data[2] << 8) | (data[3]);
 202                 }
 203               else if (looking_for & MEMIND)
 204                 {
 205                   abs = data[1];
 206                 }
 207               else if (looking_for & L_32)
 208                 {
 209                   int i = len >> 1;
 210
 211                   abs = (data[i] << 24)
 212                     | (data[i + 1] << 16)
 213                     | (data[i + 2] << 8)
 214                     | (data[i + 3]);
 215
 216                   plen = 32;
 217                 }
 218               else if (looking_for & L_24)
 219                 {
 220                   int i = len >> 1;
 221
 222                   abs = (data[i] << 16) | (data[i + 1] << 8) | (data[i + 2]);
 223                   plen = 24;
 224                 }
 225               else if (looking_for & IGNORE)
 226                 {
 227                   ;
 228                 }
 229               else if (looking_for & DISPREG)
 230                 {
 231                   rdisp = thisnib;
 232                 }
 233               else if (looking_for & KBIT)
 234                 {
 235                   switch (thisnib)
 236                     {
 237                     case 9:
 238                       abs = 4;
 239                       break;
 240                     case 8:
 241                       abs = 2;
 242                       break;
 243                     case 0:
 244                       abs = 1;
 245                       break;
 246                     default:
 247                       goto fail;
 248                     }
 249                 }
 250               else if (looking_for & L_8)
 251                 {
 252                   plen = 8;
 253                   abs = data[len >> 1];
 254                 }
 255               else if (looking_for & L_3)
 256                 {
 257                   bit = thisnib & 0x7;
 258                 }
 259               else if (looking_for & L_2)
 260                 {
 261                   plen = 2;
 262                   abs = thisnib & 0x3;
 263                 }
 264               else if (looking_for & MACREG)
 265                 {
 266                   abs = (thisnib == 3);
 267                 }
 268               else if (looking_for == E)
 269                 {
 270                   int i;
 271
 272                   for (i = 0; i < qi->length; i++)
 273                     fprintf (stream, "%02x ", data[i]);
 274
 275                   for (; i < 6; i++)
 276                     fprintf (stream, "   ");
 277
 278                   fprintf (stream, "%s\t", q->name);
 279
 280                   /* Gross.  Disgusting.  */
 281                   if (strcmp (q->name, "ldm.l") == 0)
 282                     {
 283                       int count, high;
 284
 285                       count = (data[1] >> 4) & 0x3;
 286                       high = data[3] & 0x7;
 287
 288                       fprintf (stream, "@sp+,er%d-er%d", high - count, high);
 289                       return qi->length;
 290                     }
 291
 292                   if (strcmp (q->name, "stm.l") == 0)
 293                     {
 294                       int count, low;
 295
 296                       count = (data[1] >> 4) & 0x3;
 297                       low = data[3] & 0x7;
 298
 299                       fprintf (stream, "er%d-er%d,@-sp", low, low + count);
 300                       return qi->length;
 301                     }
 302
 303                   /* Fill in the args.  */
 304                   {
 305                     op_type *args = q->args.nib;
 306                     int hadone = 0;
 307
 308                     while (*args != E)
 309                       {
 310                         int x = *args;
 311
 312                         if (hadone)
 313                           fprintf (stream, ",");
 314
 315                         if (x & L_3)
 316                           {
 317                             fprintf (stream, "#0x%x", (unsigned) bit);
 318                           }
 319                         else if (x & (IMM | KBIT | DBIT))
 320                           {
 321                             /* Bletch.  For shal #2,er0 and friends.  */
 322                             if (*(args + 1) & SRC_IN_DST)
 323                               abs = 2;
 324
 325                             fprintf (stream, "#0x%x", (unsigned) abs);
 326                           }
 327                         else if (x & REG)
 328                           {
 329                             int rn = (x & DST) ? rd : rs;
 330
 331                             switch (x & SIZE)
 332                               {
 333                               case L_8:
 334                                 fprintf (stream, "%s", regnames[rn]);
 335                                 break;
 336                               case L_16:
 337                                 fprintf (stream, "%s", wregnames[rn]);
 338                                 break;
 339                               case L_P:
 340                               case L_32:
 341                                 fprintf (stream, "%s", lregnames[rn]);
 342                                 break;
 343                               }
 344                           }
 345                         else if (x & MACREG)
 346                           {
 347                             fprintf (stream, "mac%c", abs ? 'l' : 'h');
 348                           }
 349                         else if (x & INC)
 350                           {
 351                             fprintf (stream, "@%s+", pregnames[rs]);
 352                           }
 353                         else if (x & DEC)
 354                           {
 355                             fprintf (stream, "@-%s", pregnames[rd]);
 356                           }
 357                         else if (x & IND)
 358                           {
 359                             int rn = (x & DST) ? rd : rs;
 360                             fprintf (stream, "@%s", pregnames[rn]);
 361                           }
 362                         else if (x & ABS8MEM)
 363                           {
 364                             fprintf (stream, "@0x%x:8", (unsigned) abs);
 365                           }
 366                         else if (x & (ABS | ABSJMP))
 367                           {
 368                             fprintf (stream, "@0x%x:%d", (unsigned) abs, plen);
 369                           }
 370                         else if (x & MEMIND)
 371                           {
 372                             fprintf (stream, "@@%d (%x)", abs, abs);
 373                           }
 374                         else if (x & PCREL)
 375                           {
 376                             if (x & L_16)
 377                               {
 378                                 abs += 2;
 379                                 fprintf (stream,
 380                                          ".%s%d (%x)",
 381                                          (short) abs > 0 ? "+" : "",
 382                                          (short) abs, addr + (short) abs + 2);
 383                               }
 384                             else
 385                               {
 386                                 fprintf (stream,
 387                                          ".%s%d (%x)",
 388                                          (char) abs > 0 ? "+" : "",
 389                                          (char) abs, addr + (char) abs + 2);
 390                               }
 391                           }
 392                         else if (x & DISP)
 393                           {
 394                             fprintf (stream, "@(0x%x:%d,%s)",
 395                                      abs, plen, pregnames[rdisp]);
 396                           }
 397                         else if (x & CCR)
 398                           {
 399                             fprintf (stream, "ccr");
 400                           }
 401                         else if (x & EXR)
 402                           {
 403                             fprintf (stream, "exr");
 404                           }
 405                         else
 406                           /* xgettext:c-format */
 407                           fprintf (stream, _("Hmmmm %x"), x);
 408
 409                         hadone = 1;
 410                         args++;
 411                       }
 412                   }
 413
 414                   return qi->length;
 415                 }
 416               else
 417                 /* xgettext:c-format */
 418                 fprintf (stream, _("Don't understand %x \n"), looking_for);
 419             }
 420
 421           len++;
 422           nib++;
 423         }
 424
 425     fail:
 426       ;
 427     }
 428
 429   /* Fell off the end.  */
 430   fprintf (stream, "%02x %02x        .word\tH'%x,H'%x",
 431            data[0], data[1],
 432            data[0], data[1]);
 433   return 2;
 434 }
 435
 436 int
 437 print_insn_h8300 (addr, info)
 438      bfd_vma addr;
 439      disassemble_info *info;
 440 {
 441   return bfd_h8_disassemble (addr, info, 0);
 442 }
 443
 444 int
 445 print_insn_h8300h (addr, info)
 446      bfd_vma addr;
 447      disassemble_info *info;
 448 {
 449   return bfd_h8_disassemble (addr, info, 1);
 450 }
 451
 452 int
 453 print_insn_h8300s (addr, info)
 454      bfd_vma addr;
 455      disassemble_info *info;
 456 {
 457   return bfd_h8_disassemble (addr, info, 2);
 458 }