opcodes/z8k-dis.c

   1 /* Disassemble z8000 code.
   2    Copyright 1992, 1993, 1998, 2000, 2001, 2002, 2003, 2007
   3    Free Software Foundation, Inc.
   4
   5    This file is part of the GNU opcodes library.
   6
   7    This library 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 3, or (at your option)
  10    any later version.
  11
  12    It is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this file; see the file COPYING.  If not, write to the
  19    Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "dis-asm.h"
  24
  25 #define DEFINE_TABLE
  26 #include "z8k-opc.h"
  27
  28 #include <setjmp.h>
  29
  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   int 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 /* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
  57    to ADDR (exclusive) are valid.  Returns 1 for success, longjmps
  58    on error.  */
  59 #define FETCH_DATA(info, nibble) \
  60   ((nibble) < ((instr_data_s *) (info->private_data))->max_fetched \
  61    ? 1 : fetch_data ((info), (nibble)))
  62
  63 static int
  64 fetch_data (struct disassemble_info *info, int nibble)
  65 {
  66   unsigned char mybuf[20];
  67   int status;
  68   instr_data_s *priv = (instr_data_s *) info->private_data;
  69
  70   if ((nibble % 4) != 0)
  71     abort ();
  72
  73   status = (*info->read_memory_func) (priv->insn_start,
  74                                       (bfd_byte *) mybuf,
  75                                       nibble / 2,
  76                                       info);
  77   if (status != 0)
  78     {
  79       (*info->memory_error_func) (status, priv->insn_start, info);
  80       longjmp (priv->bailout, 1);
  81     }
  82
  83   {
  84     int i;
  85     unsigned char *p = mybuf;
  86
  87     for (i = 0; i < nibble;)
  88       {
  89         priv->words[i] = (p[0] << 8) | p[1];
  90
  91         priv->bytes[i] = *p;
  92         priv->nibbles[i++] = *p >> 4;
  93         priv->nibbles[i++] = *p & 0xf;
  94
  95         ++p;
  96         priv->bytes[i] = *p;
  97         priv->nibbles[i++] = *p >> 4;
  98         priv->nibbles[i++] = *p & 0xf;
  99
 100         ++p;
 101       }
 102   }
 103   priv->max_fetched = nibble;
 104   return 1;
 105 }
 106
 107 static char *codes[16] =
 108   {
 109     "f",
 110     "lt",
 111     "le",
 112     "ule",
 113     "ov/pe",
 114     "mi",
 115     "eq",
 116     "c/ult",
 117     "t",
 118     "ge",
 119     "gt",
 120     "ugt",
 121     "nov/po",
 122     "pl",
 123     "ne",
 124     "nc/uge"
 125   };
 126
 127 static char *ctrl_names[8] =
 128   {
 129     "<invld>",
 130     "flags",
 131     "fcw",
 132     "refresh",
 133     "psapseg",
 134     "psapoff",
 135     "nspseg",
 136     "nspoff"
 137   };
 138
 139 static int seg_length;
 140 int z8k_lookup_instr (unsigned char *, disassemble_info *);
 141 static void output_instr (instr_data_s *, unsigned long, disassemble_info *);
 142 static void unpack_instr (instr_data_s *, int, disassemble_info *);
 143 static void unparse_instr (instr_data_s *, int);
 144
 145 static int
 146 print_insn_z8k (bfd_vma addr, disassemble_info *info, int is_segmented)
 147 {
 148   instr_data_s instr_data;
 149
 150   info->private_data = (PTR) &instr_data;
 151   instr_data.max_fetched = 0;
 152   instr_data.insn_start = addr;
 153   if (setjmp (instr_data.bailout) != 0)
 154     /* Error return.  */
 155     return -1;
 156
 157   info->bytes_per_chunk = 2;
 158   info->bytes_per_line = 6;
 159   info->display_endian = BFD_ENDIAN_BIG;
 160
 161   instr_data.tabl_index = z8k_lookup_instr (instr_data.nibbles, info);
 162   if (instr_data.tabl_index >= 0)
 163     {
 164       unpack_instr (&instr_data, is_segmented, info);
 165       unparse_instr (&instr_data, is_segmented);
 166       output_instr (&instr_data, addr, info);
 167       return z8k_table[instr_data.tabl_index].length + seg_length;
 168     }
 169   else
 170     {
 171       FETCH_DATA (info, 4);
 172       (*info->fprintf_func) (info->stream, ".word %02x%02x",
 173                              instr_data.bytes[0], instr_data.bytes[2]);
 174       return 2;
 175     }
 176 }
 177
 178 int
 179 print_insn_z8001 (bfd_vma addr, disassemble_info *info)
 180 {
 181   return print_insn_z8k (addr, info, 1);
 182 }
 183
 184 int
 185 print_insn_z8002 (bfd_vma addr, disassemble_info *info)
 186 {
 187   return print_insn_z8k (addr, info, 0);
 188 }
 189
 190 int
 191 z8k_lookup_instr (unsigned char *nibbles, disassemble_info *info)
 192 {
 193   int nibl_index, tabl_index;
 194   int nibl_matched;
 195   int need_fetch = 0;
 196   unsigned short instr_nibl;
 197   unsigned short tabl_datum, datum_class, datum_value;
 198
 199   nibl_matched = 0;
 200   tabl_index = 0;
 201   FETCH_DATA (info, 4);
 202   while (!nibl_matched && z8k_table[tabl_index].name)
 203     {
 204       nibl_matched = 1;
 205       for (nibl_index = 0;
 206            nibl_index < z8k_table[tabl_index].length * 2 && nibl_matched;
 207            nibl_index++)
 208         {
 209           if ((nibl_index % 4) == 0)
 210             {
 211               /* Fetch data only if it isn't already there.  */
 212               if (nibl_index >= 4 || (nibl_index < 4 && need_fetch))
 213                 FETCH_DATA (info, nibl_index + 4);   /* Fetch one word at a time.  */
 214               if (nibl_index < 4)
 215                 need_fetch = 0;
 216               else
 217                 need_fetch = 1;
 218             }
 219           instr_nibl = nibbles[nibl_index];
 220
 221           tabl_datum = z8k_table[tabl_index].byte_info[nibl_index];
 222           datum_class = tabl_datum & CLASS_MASK;
 223           datum_value = ~CLASS_MASK & tabl_datum;
 224
 225           switch (datum_class)
 226             {
 227             case CLASS_BIT:
 228               if (datum_value != instr_nibl)
 229                 nibl_matched = 0;
 230               break;
 231             case CLASS_IGNORE:
 232               break;
 233             case CLASS_00II:
 234               if (!((~instr_nibl) & 0x4))
 235                 nibl_matched = 0;
 236               break;
 237             case CLASS_01II:
 238               if (!(instr_nibl & 0x4))
 239                 nibl_matched = 0;
 240               break;
 241             case CLASS_0CCC:
 242               if (!((~instr_nibl) & 0x8))
 243                 nibl_matched = 0;
 244               break;
 245             case CLASS_1CCC:
 246               if (!(instr_nibl & 0x8))
 247                 nibl_matched = 0;
 248               break;
 249             case CLASS_0DISP7:
 250               if (!((~instr_nibl) & 0x8))
 251                 nibl_matched = 0;
 252               nibl_index += 1;
 253               break;
 254             case CLASS_1DISP7:
 255               if (!(instr_nibl & 0x8))
 256                 nibl_matched = 0;
 257               nibl_index += 1;
 258               break;
 259             case CLASS_REGN0:
 260               if (instr_nibl == 0)
 261                 nibl_matched = 0;
 262               break;
 263             case CLASS_BIT_1OR2:
 264               if ((instr_nibl | 0x2) != (datum_value | 0x2))
 265                 nibl_matched = 0;
 266               break;
 267             default:
 268               break;
 269             }
 270         }
 271
 272       if (nibl_matched)
 273         return tabl_index;
 274
 275       tabl_index++;
 276     }
 277   return -1;
 278 }
 279
 280 static void
 281 output_instr (instr_data_s *instr_data,
 282               unsigned long addr ATTRIBUTE_UNUSED,
 283               disassemble_info *info)
 284 {
 285   int num_bytes;
 286   char out_str[100];
 287
 288   out_str[0] = 0;
 289
 290   num_bytes = (z8k_table[instr_data->tabl_index].length + seg_length) * 2;
 291   FETCH_DATA (info, num_bytes);
 292
 293   strcat (out_str, instr_data->instr_asmsrc);
 294
 295   (*info->fprintf_func) (info->stream, "%s", out_str);
 296 }
 297
 298 static void
 299 unpack_instr (instr_data_s *instr_data, int is_segmented, disassemble_info *info)
 300 {
 301   int nibl_count, loop;
 302   unsigned short instr_nibl, instr_byte, instr_word;
 303   long instr_long;
 304   unsigned int tabl_datum, datum_class;
 305   unsigned short datum_value;
 306
 307   nibl_count = 0;
 308   loop = 0;
 309   seg_length = 0;
 310
 311   while (z8k_table[instr_data->tabl_index].byte_info[loop] != 0)
 312     {
 313       FETCH_DATA (info, nibl_count + 4 - (nibl_count % 4));
 314       instr_nibl = instr_data->nibbles[nibl_count];
 315       instr_byte = instr_data->bytes[nibl_count & ~1];
 316       instr_word = instr_data->words[nibl_count & ~3];
 317
 318       tabl_datum = z8k_table[instr_data->tabl_index].byte_info[loop];
 319       datum_class = tabl_datum & CLASS_MASK;
 320       datum_value = tabl_datum & ~CLASS_MASK;
 321
 322       switch (datum_class)
 323         {
 324         case CLASS_DISP:
 325           switch (datum_value)
 326             {
 327             case ARG_DISP16:
 328               instr_data->displacement = instr_data->insn_start + 4
 329                 + (signed short) (instr_word & 0xffff);
 330               nibl_count += 3;
 331               break;
 332             case ARG_DISP12:
 333               if (instr_word & 0x800)
 334                 /* Negative 12 bit displacement.  */
 335                 instr_data->displacement = instr_data->insn_start + 2
 336                   - (signed short) ((instr_word & 0xfff) | 0xf000) * 2;
 337               else
 338                 instr_data->displacement = instr_data->insn_start + 2
 339                   - (instr_word & 0x0fff) * 2;
 340
 341               nibl_count += 2;
 342               break;
 343             default:
 344               break;
 345             }
 346           break;
 347         case CLASS_IMM:
 348           switch (datum_value)
 349             {
 350             case ARG_IMM4:
 351               instr_data->immediate = instr_nibl;
 352               break;
 353             case ARG_NIM4:
 354               instr_data->immediate = (- instr_nibl) & 0xf;
 355               break;
 356             case ARG_NIM8:
 357               instr_data->immediate = (- instr_byte) & 0xff;
 358               nibl_count += 1;
 359               break;
 360             case ARG_IMM8:
 361               instr_data->immediate = instr_byte;
 362               nibl_count += 1;
 363               break;
 364             case ARG_IMM16:
 365               instr_data->immediate = instr_word;
 366               nibl_count += 3;
 367               break;
 368             case ARG_IMM32:
 369               FETCH_DATA (info, nibl_count + 8);
 370               instr_long = (instr_data->words[nibl_count] << 16)
 371                 | (instr_data->words[nibl_count + 4]);
 372               instr_data->immediate = instr_long;
 373               nibl_count += 7;
 374               break;
 375             case ARG_IMMN:
 376               instr_data->immediate = instr_nibl - 1;
 377               break;
 378             case ARG_IMM4M1:
 379               instr_data->immediate = instr_nibl + 1;
 380               break;
 381             case ARG_IMM_1:
 382               instr_data->immediate = 1;
 383               break;
 384             case ARG_IMM_2:
 385               instr_data->immediate = 2;
 386               break;
 387             case ARG_IMM2:
 388               instr_data->immediate = instr_nibl & 0x3;
 389               break;
 390             default:
 391               break;
 392             }
 393           break;
 394         case CLASS_CC:
 395           instr_data->cond_code = instr_nibl;
 396           break;
 397         case CLASS_ADDRESS:
 398           if (is_segmented)
 399             {
 400               if (instr_nibl & 0x8)
 401                 {
 402                   FETCH_DATA (info, nibl_count + 8);
 403                   instr_long = (instr_data->words[nibl_count] << 16)
 404                     | (instr_data->words[nibl_count + 4]);
 405                   instr_data->address = ((instr_word & 0x7f00) << 16)
 406                     + (instr_long & 0xffff);
 407                   nibl_count += 7;
 408                   seg_length = 2;
 409                 }
 410               else
 411                 {
 412                   instr_data->address = ((instr_word & 0x7f00) << 16)
 413                     + (instr_word & 0x00ff);
 414                   nibl_count += 3;
 415                 }
 416             }
 417           else
 418             {
 419               instr_data->address = instr_word;
 420               nibl_count += 3;
 421             }
 422           break;
 423         case CLASS_0CCC:
 424         case CLASS_1CCC:
 425           instr_data->ctrl_code = instr_nibl & 0x7;
 426           break;
 427         case CLASS_0DISP7:
 428           instr_data->displacement =
 429             instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
 430           nibl_count += 1;
 431           break;
 432         case CLASS_1DISP7:
 433           instr_data->displacement =
 434             instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
 435           nibl_count += 1;
 436           break;
 437         case CLASS_01II:
 438           instr_data->interrupts = instr_nibl & 0x3;
 439           break;
 440         case CLASS_00II:
 441           instr_data->interrupts = instr_nibl & 0x3;
 442           break;
 443         case CLASS_IGNORE:
 444         case CLASS_BIT:
 445           instr_data->ctrl_code = instr_nibl & 0x7;
 446           break;
 447         case CLASS_FLAGS:
 448           instr_data->flags = instr_nibl;
 449           break;
 450         case CLASS_REG:
 451           instr_data->arg_reg[datum_value] = instr_nibl;
 452           break;
 453         case CLASS_REGN0:
 454           instr_data->arg_reg[datum_value] = instr_nibl;
 455           break;
 456         case CLASS_DISP8:
 457           instr_data->displacement =
 458             instr_data->insn_start + 2 + (signed char) instr_byte * 2;
 459           nibl_count += 1;
 460           break;
 461         case CLASS_BIT_1OR2:
 462           instr_data->immediate = ((instr_nibl >> 1) & 0x1) + 1;
 463           nibl_count += 1;
 464           break;
 465         default:
 466           abort ();
 467           break;
 468         }
 469
 470       loop += 1;
 471       nibl_count += 1;
 472     }
 473 }
 474
 475 static void
 476 print_intr(char *tmp_str, unsigned long interrupts)
 477 {
 478   int comma = 0;
 479
 480   *tmp_str = 0;
 481   if (! (interrupts & 2))
 482     {
 483       strcat (tmp_str, "vi");
 484       comma = 1;
 485     }
 486   if (! (interrupts & 1))
 487     {
 488       if (comma) strcat (tmp_str, ",");
 489       strcat (tmp_str, "nvi");
 490     }
 491 }
 492
 493 static void
 494 print_flags(char *tmp_str, unsigned long flags)
 495 {
 496   int comma = 0;
 497
 498   *tmp_str = 0;
 499   if (flags & 8)
 500     {
 501       strcat (tmp_str, "c");
 502       comma = 1;
 503     }
 504   if (flags & 4)
 505     {
 506       if (comma) strcat (tmp_str, ",");
 507       strcat (tmp_str, "z");
 508       comma = 1;
 509     }
 510   if (flags & 2)
 511     {
 512       if (comma) strcat (tmp_str, ",");
 513       strcat (tmp_str, "s");
 514       comma = 1;
 515     }
 516   if (flags & 1)
 517     {
 518       if (comma) strcat (tmp_str, ",");
 519       strcat (tmp_str, "p");
 520     }
 521 }
 522
 523 static void
 524 unparse_instr (instr_data_s *instr_data, int is_segmented)
 525 {
 526   unsigned short datum_value;
 527   unsigned int tabl_datum, datum_class;
 528   int loop, loop_limit;
 529   char out_str[80], tmp_str[25];
 530
 531   sprintf (out_str, "%s\t", z8k_table[instr_data->tabl_index].name);
 532
 533   loop_limit = z8k_table[instr_data->tabl_index].noperands;
 534   for (loop = 0; loop < loop_limit; loop++)
 535     {
 536       if (loop)
 537         strcat (out_str, ",");
 538
 539       tabl_datum = z8k_table[instr_data->tabl_index].arg_info[loop];
 540       datum_class = tabl_datum & CLASS_MASK;
 541       datum_value = tabl_datum & ~CLASS_MASK;
 542
 543       switch (datum_class)
 544         {
 545         case CLASS_X:
 546           sprintf (tmp_str, "0x%0lx(r%ld)", instr_data->address,
 547                    instr_data->arg_reg[datum_value]);
 548           strcat (out_str, tmp_str);
 549           break;
 550         case CLASS_BA:
 551           if (is_segmented)
 552             sprintf (tmp_str, "rr%ld(#0x%lx)", instr_data->arg_reg[datum_value],
 553                      instr_data->immediate);
 554           else
 555             sprintf (tmp_str, "r%ld(#0x%lx)", instr_data->arg_reg[datum_value],
 556                      instr_data->immediate);
 557           strcat (out_str, tmp_str);
 558           break;
 559         case CLASS_BX:
 560           if (is_segmented)
 561             sprintf (tmp_str, "rr%ld(r%ld)", instr_data->arg_reg[datum_value],
 562                      instr_data->arg_reg[ARG_RX]);
 563           else
 564             sprintf (tmp_str, "r%ld(r%ld)", instr_data->arg_reg[datum_value],
 565                      instr_data->arg_reg[ARG_RX]);
 566           strcat (out_str, tmp_str);
 567           break;
 568         case CLASS_DISP:
 569           sprintf (tmp_str, "0x%0lx", instr_data->displacement);
 570           strcat (out_str, tmp_str);
 571           break;
 572         case CLASS_IMM:
 573           if (datum_value == ARG_IMM2)  /* True with EI/DI instructions only.  */
 574             {
 575               print_intr (tmp_str, instr_data->interrupts);
 576               strcat (out_str, tmp_str);
 577               break;
 578             }
 579           sprintf (tmp_str, "#0x%0lx", instr_data->immediate);
 580           strcat (out_str, tmp_str);
 581           break;
 582         case CLASS_CC:
 583           sprintf (tmp_str, "%s", codes[instr_data->cond_code]);
 584           strcat (out_str, tmp_str);
 585           break;
 586         case CLASS_CTRL:
 587           sprintf (tmp_str, "%s", ctrl_names[instr_data->ctrl_code]);
 588           strcat (out_str, tmp_str);
 589           break;
 590         case CLASS_DA:
 591         case CLASS_ADDRESS:
 592           sprintf (tmp_str, "0x%0lx", instr_data->address);
 593           strcat (out_str, tmp_str);
 594           break;
 595         case CLASS_IR:
 596           if (is_segmented)
 597             sprintf (tmp_str, "@rr%ld", instr_data->arg_reg[datum_value]);
 598           else
 599             sprintf (tmp_str, "@r%ld", instr_data->arg_reg[datum_value]);
 600           strcat (out_str, tmp_str);
 601           break;
 602         case CLASS_IRO:
 603           sprintf (tmp_str, "@r%ld", instr_data->arg_reg[datum_value]);
 604           strcat (out_str, tmp_str);
 605           break;
 606         case CLASS_FLAGS:
 607           print_flags(tmp_str, instr_data->flags);
 608           strcat (out_str, tmp_str);
 609           break;
 610         case CLASS_REG_BYTE:
 611           if (instr_data->arg_reg[datum_value] >= 0x8)
 612             sprintf (tmp_str, "rl%ld",
 613                      instr_data->arg_reg[datum_value] - 0x8);
 614           else
 615             sprintf (tmp_str, "rh%ld", instr_data->arg_reg[datum_value]);
 616           strcat (out_str, tmp_str);
 617           break;
 618         case CLASS_REG_WORD:
 619           sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
 620           strcat (out_str, tmp_str);
 621           break;
 622         case CLASS_REG_QUAD:
 623           sprintf (tmp_str, "rq%ld", instr_data->arg_reg[datum_value]);
 624           strcat (out_str, tmp_str);
 625           break;
 626         case CLASS_REG_LONG:
 627           sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
 628           strcat (out_str, tmp_str);
 629           break;
 630         case CLASS_PR:
 631           if (is_segmented)
 632             sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
 633           else
 634             sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
 635           strcat (out_str, tmp_str);
 636           break;
 637         default:
 638           abort ();
 639           break;
 640         }
 641     }
 642
 643   strcpy (instr_data->instr_asmsrc, out_str);
 644 }