opcodes/z8k-dis.c

   1 /* Disassemble z8000 code.
   2    Copyright 1992, 1993, 1998, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GNU Binutils.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20    USA.  */
  21
  22 #include "sysdep.h"
  23 #include "dis-asm.h"
  24
  25 #define DEFINE_TABLE
  26 #include "z8k-opc.h"
  27 \f
  28 #include <setjmp.h>
  29 \f
  30 typedef struct
  31 {
  32   /* These are all indexed by nibble number (i.e only every other entry
  33      of bytes is used, and every 4th entry of words).  */
  34   unsigned char nibbles[24];
  35   unsigned char bytes[24];
  36   unsigned short words[24];
  37
  38   /* Nibble number of first word not yet fetched.  */
  39   int max_fetched;
  40   bfd_vma insn_start;
  41   jmp_buf bailout;
  42
  43   long tabl_index;
  44   char instr_asmsrc[80];
  45   unsigned long arg_reg[0x0f];
  46   unsigned long immediate;
  47   unsigned long displacement;
  48   unsigned long address;
  49   unsigned long cond_code;
  50   unsigned long ctrl_code;
  51   unsigned long flags;
  52   unsigned long interrupts;
  53 }
  54 instr_data_s;
  55
  56 static int fetch_data PARAMS ((struct disassemble_info *, int));
  57
  58
  59 /* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
  60    to ADDR (exclusive) are valid.  Returns 1 for success, longjmps
  61    on error.  */
  62 #define FETCH_DATA(info, nibble) \
  63   ((nibble) < ((instr_data_s *) (info->private_data))->max_fetched \
  64    ? 1 : fetch_data ((info), (nibble)))
  65
  66 static int
  67 fetch_data (info, nibble)
  68      struct disassemble_info *info;
  69      int nibble;
  70 {
  71   unsigned char mybuf[20];
  72   int status;
  73   instr_data_s *priv = (instr_data_s *) info->private_data;
  74
  75   if ((nibble % 4) != 0)
  76     abort ();
  77
  78   status = (*info->read_memory_func) (priv->insn_start,
  79                                       (bfd_byte *) mybuf,
  80                                       nibble / 2,
  81                                       info);
  82   if (status != 0)
  83     {
  84       (*info->memory_error_func) (status, priv->insn_start, info);
  85       longjmp (priv->bailout, 1);
  86     }
  87
  88   {
  89     int i;
  90     unsigned char *p = mybuf;
  91
  92     for (i = 0; i < nibble;)
  93       {
  94         priv->words[i] = (p[0] << 8) | p[1];
  95
  96         priv->bytes[i] = *p;
  97         priv->nibbles[i++] = *p >> 4;
  98         priv->nibbles[i++] = *p & 0xf;
  99
 100         ++p;
 101         priv->bytes[i] = *p;
 102         priv->nibbles[i++] = *p >> 4;
 103         priv->nibbles[i++] = *p & 0xf;
 104
 105         ++p;
 106       }
 107   }
 108   priv->max_fetched = nibble;
 109   return 1;
 110 }
 111
 112 static char *codes[16] =
 113   {
 114     "f",
 115     "lt",
 116     "le",
 117     "ule",
 118     "ov/pe",
 119     "mi",
 120     "eq",
 121     "c/ult",
 122     "t",
 123     "ge",
 124     "gt",
 125     "ugt",
 126     "nov/po",
 127     "pl",
 128     "ne",
 129     "nc/uge"
 130   };
 131
 132 static char *ctrl_names[8] =
 133   {
 134     "<invld>",
 135     "flags",
 136     "fcw",
 137     "refresh",
 138     "psapseg",
 139     "psapoff",
 140     "nspseg",
 141     "nspoff"
 142   };
 143
 144 static int seg_length;
 145 static int print_insn_z8k PARAMS ((bfd_vma, disassemble_info *, int));
 146 int z8k_lookup_instr PARAMS ((unsigned char *, disassemble_info *));
 147 static void output_instr
 148   PARAMS ((instr_data_s *, unsigned long, disassemble_info *));
 149 static void unpack_instr PARAMS ((instr_data_s *, int, disassemble_info *));
 150 static void unparse_instr PARAMS ((instr_data_s *, int));
 151
 152 static int
 153 print_insn_z8k (addr, info, is_segmented)
 154      bfd_vma addr;
 155      disassemble_info *info;
 156      int is_segmented;
 157 {
 158   instr_data_s instr_data;
 159
 160   info->private_data = (PTR) &instr_data;
 161   instr_data.max_fetched = 0;
 162   instr_data.insn_start = addr;
 163   if (setjmp (instr_data.bailout) != 0)
 164     /* Error return.  */
 165     return -1;
 166
 167   info->bytes_per_chunk = 2;
 168   info->bytes_per_line = 6;
 169   info->display_endian = BFD_ENDIAN_BIG;
 170
 171   instr_data.tabl_index = z8k_lookup_instr (instr_data.nibbles, info);
 172   if (instr_data.tabl_index > 0)
 173     {
 174       unpack_instr (&instr_data, is_segmented, info);
 175       unparse_instr (&instr_data, is_segmented);
 176       output_instr (&instr_data, addr, info);
 177       return z8k_table[instr_data.tabl_index].length + seg_length;
 178     }
 179   else
 180     {
 181       FETCH_DATA (info, 4);
 182       (*info->fprintf_func) (info->stream, ".word %02x%02x",
 183                              instr_data.bytes[0], instr_data.bytes[2]);
 184       return 2;
 185     }
 186 }
 187
 188 int
 189 print_insn_z8001 (addr, info)
 190      bfd_vma addr;
 191      disassemble_info *info;
 192 {
 193   return print_insn_z8k (addr, info, 1);
 194 }
 195
 196 int
 197 print_insn_z8002 (addr, info)
 198      bfd_vma addr;
 199      disassemble_info *info;
 200 {
 201   return print_insn_z8k (addr, info, 0);
 202 }
 203
 204 int
 205 z8k_lookup_instr (nibbles, info)
 206      unsigned char *nibbles;
 207      disassemble_info *info;
 208 {
 209
 210   int nibl_index, tabl_index;
 211   int nibl_matched;
 212   unsigned short instr_nibl;
 213   unsigned short tabl_datum, datum_class, datum_value;
 214
 215   nibl_matched = 0;
 216   tabl_index = 0;
 217   while (!nibl_matched && z8k_table[tabl_index].name)
 218     {
 219       nibl_matched = 1;
 220       for (nibl_index = 0;
 221            nibl_index < z8k_table[tabl_index].length * 2 && nibl_matched;
 222            nibl_index++)
 223         {
 224           if ((nibl_index % 4) == 0)
 225             /* Fetch one word at a time.  */
 226             FETCH_DATA (info, nibl_index + 4);
 227           instr_nibl = nibbles[nibl_index];
 228
 229           tabl_datum = z8k_table[tabl_index].byte_info[nibl_index];
 230           datum_class = tabl_datum & CLASS_MASK;
 231           datum_value = ~CLASS_MASK & tabl_datum;
 232
 233           switch (datum_class)
 234             {
 235             case CLASS_BIT:
 236               if (datum_value != instr_nibl)
 237                 nibl_matched = 0;
 238               break;
 239             case CLASS_IGNORE:
 240               break;
 241             case CLASS_00II:
 242               if (!((~instr_nibl) & 0x4))
 243                 nibl_matched = 0;
 244               break;
 245             case CLASS_01II:
 246               if (!(instr_nibl & 0x4))
 247                 nibl_matched = 0;
 248               break;
 249             case CLASS_0CCC:
 250               if (!((~instr_nibl) & 0x8))
 251                 nibl_matched = 0;
 252               break;
 253             case CLASS_1CCC:
 254               if (!(instr_nibl & 0x8))
 255                 nibl_matched = 0;
 256               break;
 257             case CLASS_0DISP7:
 258               if (!((~instr_nibl) & 0x8))
 259                 nibl_matched = 0;
 260               nibl_index += 1;
 261               break;
 262             case CLASS_1DISP7:
 263               if (!(instr_nibl & 0x8))
 264                 nibl_matched = 0;
 265               nibl_index += 1;
 266               break;
 267             case CLASS_REGN0:
 268               if (instr_nibl == 0)
 269                 nibl_matched = 0;
 270               break;
 271             case CLASS_BIT_1OR2:
 272               if ((instr_nibl | 0x2) != (datum_value | 0x2))
 273                 nibl_matched = 0;
 274               break;
 275             default:
 276               break;
 277             }
 278         }
 279
 280       if (nibl_matched)
 281         return tabl_index;
 282
 283       tabl_index++;
 284     }
 285   return -1;
 286 }
 287
 288 static void
 289 output_instr (instr_data, addr, info)
 290      instr_data_s *instr_data;
 291      unsigned long addr ATTRIBUTE_UNUSED;
 292      disassemble_info *info;
 293 {
 294   int num_bytes;
 295   char out_str[100];
 296
 297   out_str[0] = 0;
 298
 299   num_bytes = (z8k_table[instr_data->tabl_index].length + seg_length) * 2;
 300   FETCH_DATA (info, num_bytes);
 301
 302   strcat (out_str, instr_data->instr_asmsrc);
 303
 304   (*info->fprintf_func) (info->stream, "%s", out_str);
 305 }
 306
 307 static void
 308 unpack_instr (instr_data, is_segmented, info)
 309      instr_data_s *instr_data;
 310      int is_segmented;
 311      disassemble_info *info;
 312 {
 313   int nibl_count, loop;
 314   unsigned short instr_nibl, instr_byte, instr_word;
 315   long instr_long;
 316   unsigned int tabl_datum, datum_class;
 317   unsigned short datum_value;
 318
 319   nibl_count = 0;
 320   loop = 0;
 321   seg_length = 0;
 322
 323   while (z8k_table[instr_data->tabl_index].byte_info[loop] != 0)
 324     {
 325       FETCH_DATA (info, nibl_count + 4 - (nibl_count % 4));
 326       instr_nibl = instr_data->nibbles[nibl_count];
 327       instr_byte = instr_data->bytes[nibl_count & ~1];
 328       instr_word = instr_data->words[nibl_count & ~3];
 329
 330       tabl_datum = z8k_table[instr_data->tabl_index].byte_info[loop];
 331       datum_class = tabl_datum & CLASS_MASK;
 332       datum_value = tabl_datum & ~CLASS_MASK;
 333
 334       switch (datum_class)
 335         {
 336         case CLASS_DISP:
 337           switch (datum_value)
 338             {
 339             case ARG_DISP16:
 340               instr_data->displacement = instr_data->insn_start + 4
 341                 + (signed short) (instr_word & 0xffff);
 342               nibl_count += 3;
 343               break;
 344             case ARG_DISP12:
 345               if (instr_word & 0x800)
 346                 /* Negative 12 bit displacement.  */
 347                 instr_data->displacement = instr_data->insn_start + 2
 348                   - (signed short) ((instr_word & 0xfff) | 0xf000) * 2;
 349               else
 350                 instr_data->displacement = instr_data->insn_start + 2
 351                   - (instr_word & 0x0fff) * 2;
 352
 353               nibl_count += 2;
 354               break;
 355             default:
 356               break;
 357             }
 358           break;
 359         case CLASS_IMM:
 360           switch (datum_value)
 361             {
 362             case ARG_IMM4:
 363               instr_data->immediate = instr_nibl;
 364               break;
 365             case ARG_NIM4:
 366               instr_data->immediate = (- instr_nibl) & 0xf;
 367               break;
 368             case ARG_NIM8:
 369               instr_data->immediate = (- instr_byte) & 0xff;
 370               nibl_count += 1;
 371               break;
 372             case ARG_IMM8:
 373               instr_data->immediate = instr_byte;
 374               nibl_count += 1;
 375               break;
 376             case ARG_IMM16:
 377               instr_data->immediate = instr_word;
 378               nibl_count += 3;
 379               break;
 380             case ARG_IMM32:
 381               FETCH_DATA (info, nibl_count + 8);
 382               instr_long = (instr_data->words[nibl_count] << 16)
 383                 | (instr_data->words[nibl_count + 4]);
 384               instr_data->immediate = instr_long;
 385               nibl_count += 7;
 386               break;
 387             case ARG_IMMN:
 388               instr_data->immediate = instr_nibl - 1;
 389               break;
 390             case ARG_IMM4M1:
 391               instr_data->immediate = instr_nibl + 1;
 392               break;
 393             case ARG_IMM_1:
 394               instr_data->immediate = 1;
 395               break;
 396             case ARG_IMM_2:
 397               instr_data->immediate = 2;
 398               break;
 399             case ARG_IMM2:
 400               instr_data->immediate = instr_nibl & 0x3;
 401               break;
 402             default:
 403               break;
 404             }
 405           break;
 406         case CLASS_CC:
 407           instr_data->cond_code = instr_nibl;
 408           break;
 409         case CLASS_ADDRESS:
 410           if (is_segmented)
 411             {
 412               if (instr_nibl & 0x8)
 413                 {
 414                   FETCH_DATA (info, nibl_count + 8);
 415                   instr_long = (instr_data->words[nibl_count] << 16)
 416                     | (instr_data->words[nibl_count + 4]);
 417                   instr_data->address = ((instr_word & 0x7f00) << 8)
 418                     + (instr_long & 0xffff);
 419                   nibl_count += 7;
 420                   seg_length = 2;
 421                 }
 422               else
 423                 {
 424                   instr_data->address = ((instr_word & 0x7f00) << 8)
 425                     + (instr_word & 0x00ff);
 426                   nibl_count += 3;
 427                 }
 428             }
 429           else
 430             {
 431               instr_data->address = instr_word;
 432               nibl_count += 3;
 433             }
 434           break;
 435         case CLASS_0CCC:
 436         case CLASS_1CCC:
 437           instr_data->ctrl_code = instr_nibl & 0x7;
 438           break;
 439         case CLASS_0DISP7:
 440           instr_data->displacement =
 441             instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
 442           nibl_count += 1;
 443           break;
 444         case CLASS_1DISP7:
 445           instr_data->displacement =
 446             instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
 447           nibl_count += 1;
 448           break;
 449         case CLASS_01II:
 450           instr_data->interrupts = instr_nibl & 0x3;
 451           break;
 452         case CLASS_00II:
 453           instr_data->interrupts = instr_nibl & 0x3;
 454           break;
 455         case CLASS_IGNORE:
 456         case CLASS_BIT:
 457           instr_data->ctrl_code = instr_nibl & 0x7;
 458           break;
 459         case CLASS_FLAGS:
 460           instr_data->flags = instr_nibl;
 461           break;
 462         case CLASS_REG:
 463           instr_data->arg_reg[datum_value] = instr_nibl;
 464           break;
 465         case CLASS_REGN0:
 466           instr_data->arg_reg[datum_value] = instr_nibl;
 467           break;
 468         case CLASS_DISP8:
 469           instr_data->displacement =
 470             instr_data->insn_start + 2 + (signed char) instr_byte * 2;
 471           nibl_count += 1;
 472           break;
 473         case CLASS_BIT_1OR2:
 474           instr_data->immediate = ((instr_nibl >> 1) & 0x1) + 1;
 475           nibl_count += 1;
 476           break;
 477         default:
 478           abort ();
 479           break;
 480         }
 481
 482       loop += 1;
 483       nibl_count += 1;
 484     }
 485 }
 486
 487 static void
 488 unparse_instr (instr_data, is_segmented)
 489      instr_data_s *instr_data;
 490      int is_segmented;
 491 {
 492   unsigned short datum_value;
 493   unsigned int tabl_datum, datum_class;
 494   int loop, loop_limit;
 495   char out_str[80], tmp_str[25];
 496
 497   sprintf (out_str, "%s\t", z8k_table[instr_data->tabl_index].name);
 498
 499   loop_limit = z8k_table[instr_data->tabl_index].noperands;
 500   for (loop = 0; loop < loop_limit; loop++)
 501     {
 502       if (loop)
 503         strcat (out_str, ",");
 504
 505       tabl_datum = z8k_table[instr_data->tabl_index].arg_info[loop];
 506       datum_class = tabl_datum & CLASS_MASK;
 507       datum_value = tabl_datum & ~CLASS_MASK;
 508
 509       switch (datum_class)
 510         {
 511         case CLASS_X:
 512           sprintf (tmp_str, "0x%0lx(r%ld)", instr_data->address,
 513                    instr_data->arg_reg[datum_value]);
 514           strcat (out_str, tmp_str);
 515           break;
 516         case CLASS_BA:
 517           if (is_segmented)
 518             sprintf (tmp_str, "rr%ld(#0x%lx)", instr_data->arg_reg[datum_value],
 519                      instr_data->immediate);
 520           else
 521             sprintf (tmp_str, "r%ld(#0x%lx)", instr_data->arg_reg[datum_value],
 522                      instr_data->immediate);
 523           strcat (out_str, tmp_str);
 524           break;
 525         case CLASS_BX:
 526           if (is_segmented)
 527             sprintf (tmp_str, "rr%ld(r%ld)", instr_data->arg_reg[datum_value],
 528                      instr_data->arg_reg[ARG_RX]);
 529           else
 530             sprintf (tmp_str, "r%ld(r%ld)", instr_data->arg_reg[datum_value],
 531                      instr_data->arg_reg[ARG_RX]);
 532           strcat (out_str, tmp_str);
 533           break;
 534         case CLASS_DISP:
 535           sprintf (tmp_str, "0x%0lx", instr_data->displacement);
 536           strcat (out_str, tmp_str);
 537           break;
 538         case CLASS_IMM:
 539           sprintf (tmp_str, "#0x%0lx", instr_data->immediate);
 540           strcat (out_str, tmp_str);
 541           break;
 542         case CLASS_CC:
 543           sprintf (tmp_str, "%s", codes[instr_data->cond_code]);
 544           strcat (out_str, tmp_str);
 545           break;
 546         case CLASS_CTRL:
 547           sprintf (tmp_str, "%s", ctrl_names[instr_data->ctrl_code]);
 548           strcat (out_str, tmp_str);
 549           break;
 550         case CLASS_DA:
 551         case CLASS_ADDRESS:
 552           sprintf (tmp_str, "0x%0lx", instr_data->address);
 553           strcat (out_str, tmp_str);
 554           break;
 555         case CLASS_IR:
 556           if (is_segmented)
 557             sprintf (tmp_str, "@rr%ld", instr_data->arg_reg[datum_value]);
 558           else
 559             sprintf (tmp_str, "@r%ld", instr_data->arg_reg[datum_value]);
 560           strcat (out_str, tmp_str);
 561           break;
 562         case CLASS_FLAGS:
 563           sprintf (tmp_str, "0x%0lx", instr_data->flags);
 564           strcat (out_str, tmp_str);
 565           break;
 566         case CLASS_REG_BYTE:
 567           if (instr_data->arg_reg[datum_value] >= 0x8)
 568             sprintf (tmp_str, "rl%ld",
 569                      instr_data->arg_reg[datum_value] - 0x8);
 570           else
 571             sprintf (tmp_str, "rh%ld", instr_data->arg_reg[datum_value]);
 572           strcat (out_str, tmp_str);
 573           break;
 574         case CLASS_REG_WORD:
 575           sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
 576           strcat (out_str, tmp_str);
 577           break;
 578         case CLASS_REG_QUAD:
 579           sprintf (tmp_str, "rq%ld", instr_data->arg_reg[datum_value]);
 580           strcat (out_str, tmp_str);
 581           break;
 582         case CLASS_REG_LONG:
 583           sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
 584           strcat (out_str, tmp_str);
 585           break;
 586         case CLASS_PR:
 587           if (is_segmented)
 588             sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
 589           else
 590             sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
 591           strcat (out_str, tmp_str);
 592           break;
 593         default:
 594           abort ();
 595           break;
 596         }
 597     }
 598
 599   strcpy (instr_data->instr_asmsrc, out_str);
 600 }