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