opcodes/h8300-dis.c

   1 /* Disassemble h8300 instructions.
   2    Copyright (C) 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 #define DEFINE_TABLE
  19
  20 #define h8_opcodes h8ops
  21 #include "opcode/h8300.h"
  22 #include "dis-asm.h"
  23
  24
  25 /* Run through the opcodes and sort them into order to make them easy
  26    to disassemble
  27  */
  28 static void
  29 bfd_h8_disassemble_init ()
  30 {
  31   unsigned int i;
  32
  33
  34   struct h8_opcode *p;
  35
  36   for (p = h8_opcodes; p->name; p++)
  37     {
  38       int n1 = 0;
  39       int n2 = 0;
  40
  41       if ((int) p->data.nib[0] < 16)
  42         {
  43           n1 = (int) p->data.nib[0];
  44         }
  45       else
  46         n1 = 0;
  47       if ((int) p->data.nib[1] < 16)
  48         {
  49           n2 = (int) p->data.nib[1];
  50         }
  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 s the length */
  56       for (i = 0; p->data.nib[i] != E; i++)
  57         /*EMPTY*/ ;
  58       if (i & 1)
  59         abort ();
  60       p->length = i / 2;
  61     }
  62
  63 }
  64
  65
  66 unsigned int
  67 bfd_h8_disassemble (addr, info, hmode)
  68      bfd_vma addr;
  69      disassemble_info *info;
  70      int hmode;
  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
  84   static CONST char *lregnames[] =
  85     {
  86       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7",
  87       "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7"
  88       }
  89   ;
  90
  91   int rs = 0;
  92   int rd = 0;
  93   int rdisp = 0;
  94   int abs = 0;
  95   int plen = 0;
  96   static boolean init = 0;
  97   struct h8_opcode *q = h8_opcodes;
  98   char CONST **pregnames = hmode ? lregnames : wregnames;
  99   int status;
 100   int l;
 101
 102   unsigned char data[20];
 103   void *stream = info->stream;
 104   fprintf_ftype fprintf = info->fprintf_func;
 105
 106   if (!init)
 107     {
 108       bfd_h8_disassemble_init ();
 109       init = 1;
 110     }
 111
 112   status = info->read_memory_func(addr, data, 2, info);
 113   if (status != 0)
 114     {
 115       info->memory_error_func(status, addr, info);
 116       return -1;
 117     }
 118   for (l = 2; status == 0 && l < 10; l+=2)
 119     {
 120       status = info->read_memory_func(addr+l, data+l, 2, info);
 121     }
 122
 123
 124
 125   /* Find the exact opcode/arg combo */
 126   while (q->name)
 127     {
 128       op_type *nib;
 129       unsigned int len = 0;
 130
 131       nib = q->data.nib;
 132
 133       while (1)
 134         {
 135           op_type looking_for = *nib;
 136           int thisnib = data[len >> 1];
 137
 138           thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib >> 4) & 0xf);
 139
 140           if (looking_for < 16 && looking_for >=0)
 141             {
 142
 143               if (looking_for != thisnib)
 144                 goto fail;
 145             }
 146
 147           else
 148             {
 149
 150               if ((int) looking_for & (int) B31)
 151                 {
 152                   if (! (((int) thisnib & 0x8) != 0))
 153                     goto fail;
 154                   looking_for = (op_type) ((int) looking_for & ~(int) B31);
 155                 }
 156               if ((int) looking_for & (int) B30)
 157                 {
 158                   if (!(((int) thisnib & 0x8) == 0))
 159                     goto fail;
 160                   looking_for = (op_type) ((int) looking_for & ~(int) B30);
 161                 }
 162
 163               if (looking_for & DBIT)
 164                 {
 165                   if ((looking_for & 5) != (thisnib &5)) goto fail;
 166                   abs = (thisnib & 0x8) ? 2 : 1;
 167                 }
 168
 169               else  if (looking_for & (REG | IND|INC|DEC))
 170                 {
 171                   if (looking_for & SRC)
 172                     {
 173                       rs = thisnib;
 174                     }
 175                   else
 176                     {
 177                       rd = thisnib;
 178                     }
 179                 }
 180               else if (looking_for & L_16)
 181                 {
 182                   abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
 183                   plen = 16;
 184
 185                 }
 186               else if(looking_for & ABSJMP)
 187                 {
 188                   abs =
 189                     (data[1] << 16)
 190                       | (data[2] << 8)
 191                         | (data[3]);
 192                 }
 193               else if(looking_for & MEMIND)
 194                 {
 195                   abs = data[1];
 196                 }
 197               else if (looking_for & L_32)
 198                 {
 199                   int i = len >> 1;
 200                   abs = (data[i] << 24)
 201                     | (data[i + 1] << 16)
 202                       | (data[i + 2] << 8)
 203                         | (data[i+ 3]);
 204
 205                   plen =32;
 206
 207                 }
 208               else if (looking_for & L_24)
 209                 {
 210                   int i = len >> 1;
 211                   abs = (data[i] << 16) | (data[i + 1] << 8)|  (data[i+
 212                                                                      2]);
 213                   plen =24;
 214                 }
 215               else if (looking_for & IGNORE)
 216                 {
 217
 218                 }
 219               else if (looking_for & DISPREG)
 220                 {
 221                   rdisp = thisnib;
 222                 }
 223               else if (looking_for & KBIT)
 224                 {
 225                   switch (thisnib)
 226                     {
 227                     case 9:
 228                       abs = 4;
 229                       break;
 230                     case 8:
 231                       abs = 2;
 232                       break;
 233                     case 0:
 234                       abs = 1;
 235                       break;
 236                     }
 237                 }
 238               else if (looking_for & L_8)
 239                 {
 240                   plen = 8;
 241                   abs = data[len >> 1];
 242                 }
 243               else if (looking_for & L_3)
 244                 {
 245                   plen = 3;
 246
 247                   abs = thisnib;
 248                 }
 249               else if (looking_for == E)
 250                 {
 251
 252                   {
 253                     int i;
 254
 255                     for (i = 0; i < q->length; i++)
 256                       {
 257                         fprintf (stream, "%02x ", data[i]);
 258                       }
 259                     for (; i < 6; i++)
 260                       {
 261                         fprintf (stream, "   ");
 262                       }
 263                   }
 264                   fprintf (stream, "%s\t", q->name);
 265                   /* Fill in the args */
 266                   {
 267                     op_type *args = q->args.nib;
 268                     int hadone = 0;
 269
 270
 271                     while (*args != E)
 272                       {
 273                         int x = *args;
 274                         if (hadone)
 275                           fprintf (stream, ",");
 276
 277
 278                         if (x & (IMM|KBIT|DBIT))
 279                           {
 280
 281                             fprintf (stream, "#0x%x", (unsigned) abs);
 282                           }
 283                         else if (x & REG)
 284                           {
 285                             int rn = (x & DST) ? rd : rs;
 286                             switch (x & SIZE)
 287                               {
 288                               case L_8:
 289                                 fprintf (stream, "%s", regnames[rn]);
 290                                 break;
 291                               case L_16:
 292                                 fprintf (stream, "%s", wregnames[rn]);
 293                                 break;
 294                               case L_P:
 295                               case L_32:
 296                                 fprintf (stream, "%s", lregnames[rn]);
 297                                 break;
 298
 299                               }
 300                           }
 301
 302                         else if (x & INC)
 303                           {
 304                             fprintf (stream, "@%s+", pregnames[rs]);
 305                           }
 306                         else if (x & DEC)
 307                           {
 308                             fprintf (stream, "@-%s", pregnames[rd]);
 309                           }
 310
 311                         else if (x & IND)
 312                           {
 313                             int rn = (x & DST) ? rd : rs;
 314                             fprintf (stream, "@%s", pregnames[rn]);
 315                           }
 316
 317                         else if (x & (ABS|ABSJMP|ABSMOV))
 318                           {
 319                             fprintf (stream, "@0x%x:%d", (unsigned) abs, plen);
 320                           }
 321
 322                         else if (x & MEMIND)
 323                           {
 324                             fprintf (stream, "@@%d (%x)", abs, abs);
 325                           }
 326
 327                         else if (x & PCREL)
 328                           {
 329                             if (x & L_16)
 330                               abs  +=2;
 331                             fprintf (stream, ".%s%d (%x)", (char) abs > 0 ? "+" : "", (char) abs,
 332                                      addr + (char) abs + 2);
 333                           }
 334                         else if (x & DISP)
 335                           {
 336                             fprintf (stream, "@(0x%x:%d,%s)", abs,plen, pregnames[rdisp]);
 337                           }
 338
 339                         else if (x & CCR)
 340                           {
 341
 342                             fprintf (stream, "ccr");
 343                           }
 344
 345                         else
 346                           fprintf (stream, "Hmmmm %x", x);
 347                         hadone = 1;
 348                         args++;
 349                       }
 350                   }
 351                   return q->length;
 352                 }
 353
 354
 355               else
 356                 {
 357                   fprintf (stream, "Dont understand %x \n", looking_for);
 358                 }
 359             }
 360
 361           len++;
 362           nib++;
 363         }
 364
 365     fail:
 366       q++;
 367     }
 368
 369   /* Fell of the end */
 370   fprintf (stream, "%02x %02x        .word\tH'%x,H'%x",
 371            data[0], data[1],
 372            data[0], data[1]);
 373   return 2;
 374 }
 375
 376 int
 377 print_insn_h8300 (addr, info)
 378 bfd_vma addr;
 379 disassemble_info *info;
 380 {
 381   return bfd_h8_disassemble (addr, info , 0);
 382 }
 383
 384  int
 385 print_insn_h8300h (addr, info)
 386 bfd_vma addr;
 387 disassemble_info *info;
 388 {
 389   return bfd_h8_disassemble (addr, info , 1);
 390 }
 391