opcodes/h8300-dis.c

   1 /* Disassemble h8300 instructions.
   2    Copyright (C) 1993, 1998, 2000 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 #include "sysdep.h"
  21 #define h8_opcodes h8ops
  22 #include "opcode/h8300.h"
  23 #include "dis-asm.h"
  24 #include "opintl.h"
  25
  26
  27 /* Run through the opcodes and sort them into order to make them easy
  28    to disassemble.  */
  29 static void
  30 bfd_h8_disassemble_init ()
  31 {
  32   unsigned int i;
  33   struct h8_opcode *p;
  34
  35   for (p = h8_opcodes; p->name; p++)
  36     {
  37       int n1 = 0;
  38       int n2 = 0;
  39
  40       if ((int) p->data.nib[0] < 16)
  41         n1 = (int) p->data.nib[0];
  42       else
  43         n1 = 0;
  44
  45       if ((int) p->data.nib[1] < 16)
  46         n2 = (int) p->data.nib[1];
  47       else
  48         n2 = 0;
  49
  50       /* Just make sure there are an even number of nibbles in it, and
  51          that the count is the same as the length.  */
  52       for (i = 0; p->data.nib[i] != E; i++)
  53         /*EMPTY*/;
  54
  55       if (i & 1)
  56         abort ();
  57
  58       p->length = i / 2;
  59     }
  60 }
  61
  62
  63 unsigned int
  64 bfd_h8_disassemble (addr, info, mode)
  65      bfd_vma addr;
  66      disassemble_info *info;
  67      int mode;
  68 {
  69   /* Find the first entry in the table for this opcode.  */
  70   static CONST char *regnames[] =
  71     {
  72       "r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
  73       "r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l"
  74     };
  75   static CONST char *wregnames[] =
  76     {
  77       "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  78       "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7"
  79     };
  80   static CONST char *lregnames[] =
  81     {
  82       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7",
  83       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7"
  84     };
  85   int rs = 0;
  86   int rd = 0;
  87   int rdisp = 0;
  88   int abs = 0;
  89   int bit = 0;
  90   int plen = 0;
  91   static boolean init = 0;
  92   struct h8_opcode *q = h8_opcodes;
  93   char CONST **pregnames = mode != 0 ? lregnames : wregnames;
  94   int status;
  95   int l;
  96   unsigned char data[20];
  97   void *stream = info->stream;
  98   fprintf_ftype fprintf = info->fprintf_func;
  99
 100   if (!init)
 101     {
 102       bfd_h8_disassemble_init ();
 103       init = 1;
 104     }
 105
 106   status = info->read_memory_func (addr, data, 2, info);
 107   if (status != 0)
 108     {
 109       info->memory_error_func (status, addr, info);
 110       return -1;
 111     }
 112
 113   for (l = 2; status == 0 && l < 10; l += 2)
 114     status = info->read_memory_func (addr + l, data+l, 2, info);
 115
 116   /* Find the exact opcode/arg combo.  */
 117   while (q->name)
 118     {
 119       op_type *nib;
 120       unsigned int len = 0;
 121
 122       nib = q->data.nib;
 123
 124       while (1)
 125         {
 126           op_type looking_for = *nib;
 127           int thisnib = data[len >> 1];
 128
 129           thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib >> 4) & 0xf);
 130
 131           if (looking_for < 16 && looking_for >= 0)
 132             {
 133               if (looking_for != thisnib)
 134                 goto fail;
 135             }
 136           else
 137             {
 138               if ((int) looking_for & (int) B31)
 139                 {
 140                   if (! (((int) thisnib & 0x8) != 0))
 141                     goto fail;
 142
 143                   looking_for = (op_type) ((int) looking_for & ~(int) B31);
 144                 }
 145
 146               if ((int) looking_for & (int) B30)
 147                 {
 148                   if (!(((int) thisnib & 0x8) == 0))
 149                     goto fail;
 150
 151                   looking_for = (op_type) ((int) looking_for & ~(int) B30);
 152                 }
 153
 154               if (looking_for & DBIT)
 155                 {
 156                   if ((looking_for & 2) != (thisnib & 2))
 157                     goto fail;
 158
 159                   abs = (thisnib & 0x8) ? 2 : 1;
 160                 }
 161               else if (looking_for & (REG | IND | INC | DEC))
 162                 {
 163                   if (looking_for & SRC)
 164                     rs = thisnib;
 165                   else
 166                     rd = thisnib;
 167                 }
 168               else if (looking_for & L_16)
 169                 {
 170                   abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
 171                   plen = 16;
 172                 }
 173               else if (looking_for & ABSJMP)
 174                 {
 175                   abs = (data[1] << 16) | (data[2] << 8) | (data[3]);
 176                 }
 177               else if (looking_for & MEMIND)
 178                 {
 179                   abs = data[1];
 180                 }
 181               else if (looking_for & L_32)
 182                 {
 183                   int i = len >> 1;
 184
 185                   abs = (data[i] << 24)
 186                     | (data[i + 1] << 16)
 187                     | (data[i + 2] << 8)
 188                     | (data[i+ 3]);
 189
 190                   plen = 32;
 191                 }
 192               else if (looking_for & L_24)
 193                 {
 194                   int i = len >> 1;
 195
 196                   abs = (data[i] << 16) | (data[i + 1] << 8) | (data[i + 2]);
 197                   plen = 24;
 198                 }
 199               else if (looking_for & IGNORE)
 200                 {
 201                   ;
 202                 }
 203               else if (looking_for & DISPREG)
 204                 {
 205                   rdisp = thisnib;
 206                 }
 207               else if (looking_for & KBIT)
 208                 {
 209                   switch (thisnib)
 210                     {
 211                     case 9:
 212                       abs = 4;
 213                       break;
 214                     case 8:
 215                       abs = 2;
 216                       break;
 217                     case 0:
 218                       abs = 1;
 219                       break;
 220                     default:
 221                       goto fail;
 222                     }
 223                 }
 224               else if (looking_for & L_8)
 225                 {
 226                   plen = 8;
 227                   abs = data[len >> 1];
 228                 }
 229               else if (looking_for & L_3)
 230                 {
 231                   bit = thisnib & 0x7;
 232                 }
 233               else if (looking_for & L_2)
 234                 {
 235                   plen = 2;
 236                   abs = thisnib & 0x3;
 237                 }
 238               else if (looking_for & MACREG)
 239                 {
 240                   abs = (thisnib == 3);
 241                 }
 242               else if (looking_for == E)
 243                 {
 244                   int i;
 245
 246                   for (i = 0; i < q->length; i++)
 247                     fprintf (stream, "%02x ", data[i]);
 248
 249                   for (; i < 6; i++)
 250                     fprintf (stream, "   ");
 251
 252                   fprintf (stream, "%s\t", q->name);
 253
 254                   /* Gross.  Disgusting.  */
 255                   if (strcmp (q->name, "ldm.l") == 0)
 256                     {
 257                       int count, high;
 258
 259                       count = (data[1] >> 4) & 0x3;
 260                       high = data[3] & 0x7;
 261
 262                       fprintf (stream, "@sp+,er%d-er%d", high - count, high);
 263                       return q->length;
 264                     }
 265
 266                   if (strcmp (q->name, "stm.l") == 0)
 267                     {
 268                       int count, low;
 269
 270                       count = (data[1] >> 4) & 0x3;
 271                       low = data[3] & 0x7;
 272
 273                       fprintf (stream, "er%d-er%d,@-sp", low, low + count);
 274                       return q->length;
 275                     }
 276
 277                   /* Fill in the args.  */
 278                   {
 279                     op_type *args = q->args.nib;
 280                     int hadone = 0;
 281
 282                     while (*args != E)
 283                       {
 284                         int x = *args;
 285
 286                         if (hadone)
 287                           fprintf (stream, ",");
 288
 289                         if (x & L_3)
 290                           {
 291                             fprintf (stream, "#0x%x", (unsigned) bit);
 292                           }
 293                         else if (x & (IMM | KBIT | DBIT))
 294                           {
 295                             /* Bletch.  For shal #2,er0 and friends.  */
 296                             if (*(args + 1) & SRC_IN_DST)
 297                               abs = 2;
 298
 299                             fprintf (stream, "#0x%x", (unsigned) abs);
 300                           }
 301                         else if (x & REG)
 302                           {
 303                             int rn = (x & DST) ? rd : rs;
 304
 305                             switch (x & SIZE)
 306                               {
 307                               case L_8:
 308                                 fprintf (stream, "%s", regnames[rn]);
 309                                 break;
 310                               case L_16:
 311                                 fprintf (stream, "%s", wregnames[rn]);
 312                                 break;
 313                               case L_P:
 314                               case L_32:
 315                                 fprintf (stream, "%s", lregnames[rn]);
 316                                 break;
 317                               }
 318                           }
 319                         else if (x & MACREG)
 320                           {
 321                             fprintf (stream, "mac%c", abs ? 'l' : 'h');
 322                           }
 323                         else if (x & INC)
 324                           {
 325                             fprintf (stream, "@%s+", pregnames[rs]);
 326                           }
 327                         else if (x & DEC)
 328                           {
 329                             fprintf (stream, "@-%s", pregnames[rd]);
 330                           }
 331                         else if (x & IND)
 332                           {
 333                             int rn = (x & DST) ? rd : rs;
 334                             fprintf (stream, "@%s", pregnames[rn]);
 335                           }
 336                         else if (x & ABS8MEM)
 337                           {
 338                             fprintf (stream, "@0x%x:8", (unsigned) abs);
 339                           }
 340                         else if (x & (ABS | ABSJMP))
 341                           {
 342                             fprintf (stream, "@0x%x:%d", (unsigned) abs, plen);
 343                           }
 344                         else if (x & MEMIND)
 345                           {
 346                             fprintf (stream, "@@%d (%x)", abs, abs);
 347                           }
 348                         else if (x & PCREL)
 349                           {
 350                             if (x & L_16)
 351                               {
 352                                 abs += 2;
 353                                 fprintf (stream,
 354                                          ".%s%d (%x)", (short) abs > 0 ? "+" : "",
 355                                          (short) abs, addr + (short) abs + 2);
 356                               }
 357                             else
 358                               {
 359                                 fprintf (stream,
 360                                          ".%s%d (%x)", (char) abs > 0 ? "+" : "",
 361                                          (char) abs, addr + (char) abs + 2);
 362                               }
 363                           }
 364                         else if (x & DISP)
 365                           {
 366                             fprintf (stream, "@(0x%x:%d,%s)",
 367                                      abs,plen, pregnames[rdisp]);
 368                           }
 369                         else if (x & CCR)
 370                           {
 371                             fprintf (stream, "ccr");
 372                           }
 373                         else if (x & EXR)
 374                           {
 375                             fprintf (stream, "exr");
 376                           }
 377                         else
 378                           /* xgettext:c-format */
 379                           fprintf (stream, _("Hmmmm %x"), x);
 380
 381                         hadone = 1;
 382                         args++;
 383                       }
 384                   }
 385
 386                   return q->length;
 387                 }
 388               else
 389                 /* xgettext:c-format */
 390                 fprintf (stream, _("Don't understand %x \n"), looking_for);
 391             }
 392
 393           len++;
 394           nib++;
 395         }
 396
 397     fail:
 398       q++;
 399     }
 400
 401   /* Fell off the end.  */
 402   fprintf (stream, "%02x %02x        .word\tH'%x,H'%x",
 403            data[0], data[1],
 404            data[0], data[1]);
 405
 406   return 2;
 407 }
 408
 409 int
 410 print_insn_h8300 (addr, info)
 411      bfd_vma addr;
 412      disassemble_info *info;
 413 {
 414   return bfd_h8_disassemble (addr, info, 0);
 415 }
 416
 417 int
 418 print_insn_h8300h (addr, info)
 419      bfd_vma addr;
 420      disassemble_info *info;
 421 {
 422   return bfd_h8_disassemble (addr, info, 1);
 423 }
 424
 425 int
 426 print_insn_h8300s (addr, info)
 427      bfd_vma addr;
 428      disassemble_info *info;
 429 {
 430   return bfd_h8_disassemble (addr, info, 2);
 431 }