opcodes/z8k-dis.c

   1 /* Disassemble z8000 code.
   2    Copyright (C) 1992-2022 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU opcodes library.
   5
   6    This library is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    It is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this file; see the file COPYING.  If not, write to the
  18    Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include "disassemble.h"
  23 #include "libiberty.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   unsigned int max_fetched;
  40   bfd_vma insn_start;
  41   OPCODES_SIGJMP_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       OPCODES_SIGLONGJMP (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 = &instr_data;
 151   instr_data.max_fetched = 0;
 152   instr_data.insn_start = addr;
 153   if (OPCODES_SIGSETJMP (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   unsigned 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_matched
 207              && nibl_index < ARRAY_SIZE (z8k_table[0].byte_info)
 208              && nibl_index < z8k_table[tabl_index].length * 2;
 209            nibl_index++)
 210         {
 211           if ((nibl_index % 4) == 0)
 212             {
 213               /* Fetch data only if it isn't already there.  */
 214               if (nibl_index >= 4 || (nibl_index < 4 && need_fetch))
 215                 FETCH_DATA (info, nibl_index + 4);   /* Fetch one word at a time.  */
 216               if (nibl_index < 4)
 217                 need_fetch = 0;
 218               else
 219                 need_fetch = 1;
 220             }
 221           instr_nibl = nibbles[nibl_index];
 222
 223           tabl_datum = z8k_table[tabl_index].byte_info[nibl_index];
 224           datum_class = tabl_datum & CLASS_MASK;
 225           datum_value = ~CLASS_MASK & tabl_datum;
 226
 227           switch (datum_class)
 228             {
 229             case CLASS_BIT:
 230               if (datum_value != instr_nibl)
 231                 nibl_matched = 0;
 232               break;
 233             case CLASS_IGNORE:
 234               break;
 235             case CLASS_00II:
 236               if (!((~instr_nibl) & 0x4))
 237                 nibl_matched = 0;
 238               break;
 239             case CLASS_01II:
 240               if (!(instr_nibl & 0x4))
 241                 nibl_matched = 0;
 242               break;
 243             case CLASS_0CCC:
 244               if (!((~instr_nibl) & 0x8))
 245                 nibl_matched = 0;
 246               break;
 247             case CLASS_1CCC:
 248               if (!(instr_nibl & 0x8))
 249                 nibl_matched = 0;
 250               break;
 251             case CLASS_0DISP7:
 252               if (!((~instr_nibl) & 0x8))
 253                 nibl_matched = 0;
 254               nibl_index += 1;
 255               break;
 256             case CLASS_1DISP7:
 257               if (!(instr_nibl & 0x8))
 258                 nibl_matched = 0;
 259               nibl_index += 1;
 260               break;
 261             case CLASS_REGN0:
 262               if (instr_nibl == 0)
 263                 nibl_matched = 0;
 264               break;
 265             case CLASS_BIT_1OR2:
 266               if ((instr_nibl | 0x2) != (datum_value | 0x2))
 267                 nibl_matched = 0;
 268               break;
 269             default:
 270               break;
 271             }
 272         }
 273
 274       if (nibl_matched)
 275         return tabl_index;
 276
 277       tabl_index++;
 278     }
 279   return -1;
 280 }
 281
 282 static void
 283 output_instr (instr_data_s *instr_data,
 284               unsigned long addr ATTRIBUTE_UNUSED,
 285               disassemble_info *info)
 286 {
 287   unsigned int num_bytes;
 288   char out_str[100];
 289
 290   out_str[0] = 0;
 291
 292   num_bytes = (z8k_table[instr_data->tabl_index].length + seg_length) * 2;
 293   FETCH_DATA (info, num_bytes);
 294
 295   strcat (out_str, instr_data->instr_asmsrc);
 296
 297   (*info->fprintf_func) (info->stream, "%s", out_str);
 298 }
 299
 300 static void
 301 unpack_instr (instr_data_s *instr_data, int is_segmented, disassemble_info *info)
 302 {
 303   unsigned int nibl_count, loop;
 304   unsigned short instr_nibl, instr_byte, instr_word;
 305   long instr_long;
 306   unsigned int tabl_datum, datum_class;
 307   unsigned short datum_value;
 308
 309   nibl_count = 0;
 310   loop = 0;
 311   seg_length = 0;
 312
 313   while (z8k_table[instr_data->tabl_index].byte_info[loop] != 0)
 314     {
 315       FETCH_DATA (info, nibl_count + 4 - (nibl_count % 4));
 316       instr_nibl = instr_data->nibbles[nibl_count];
 317       instr_byte = instr_data->bytes[nibl_count & ~1];
 318       instr_word = instr_data->words[nibl_count & ~3];
 319
 320       tabl_datum = z8k_table[instr_data->tabl_index].byte_info[loop];
 321       datum_class = tabl_datum & CLASS_MASK;
 322       datum_value = tabl_datum & ~CLASS_MASK;
 323
 324       switch (datum_class)
 325         {
 326         case CLASS_DISP:
 327           switch (datum_value)
 328             {
 329             case ARG_DISP16:
 330               instr_data->displacement = instr_data->insn_start + 4
 331                 + (signed short) (instr_word & 0xffff);
 332               nibl_count += 3;
 333               break;
 334             case ARG_DISP12:
 335               if (instr_word & 0x800)
 336                 /* Negative 12 bit displacement.  */
 337                 instr_data->displacement = instr_data->insn_start + 2
 338                   - (signed short) ((instr_word & 0xfff) | 0xf000) * 2;
 339               else
 340                 instr_data->displacement = instr_data->insn_start + 2
 341                   - (instr_word & 0x0fff) * 2;
 342
 343               nibl_count += 2;
 344               break;
 345             default:
 346               break;
 347             }
 348           break;
 349         case CLASS_IMM:
 350           switch (datum_value)
 351             {
 352             case ARG_IMM4:
 353               instr_data->immediate = instr_nibl;
 354               break;
 355             case ARG_NIM4:
 356               instr_data->immediate = (- instr_nibl) & 0xf;
 357               break;
 358             case ARG_NIM8:
 359               instr_data->immediate = (- instr_byte) & 0xff;
 360               nibl_count += 1;
 361               break;
 362             case ARG_IMM8:
 363               instr_data->immediate = instr_byte;
 364               nibl_count += 1;
 365               break;
 366             case ARG_IMM16:
 367               instr_data->immediate = instr_word;
 368               nibl_count += 3;
 369               break;
 370             case ARG_IMM32:
 371               FETCH_DATA (info, nibl_count + 8);
 372               instr_long = ((unsigned) instr_data->words[nibl_count] << 16
 373                             | instr_data->words[nibl_count + 4]);
 374               instr_data->immediate = instr_long;
 375               nibl_count += 7;
 376               break;
 377             case ARG_IMMN:
 378               instr_data->immediate = instr_nibl - 1;
 379               break;
 380             case ARG_IMM4M1:
 381               instr_data->immediate = instr_nibl + 1;
 382               break;
 383             case ARG_IMM_1:
 384               instr_data->immediate = 1;
 385               break;
 386             case ARG_IMM_2:
 387               instr_data->immediate = 2;
 388               break;
 389             case ARG_IMM2:
 390               instr_data->immediate = instr_nibl & 0x3;
 391               break;
 392             default:
 393               break;
 394             }
 395           break;
 396         case CLASS_CC:
 397           instr_data->cond_code = instr_nibl;
 398           break;
 399         case CLASS_ADDRESS:
 400           if (is_segmented)
 401             {
 402               if (instr_nibl & 0x8)
 403                 {
 404                   FETCH_DATA (info, nibl_count + 8);
 405                   instr_long = ((unsigned) instr_data->words[nibl_count] << 16
 406                                 | instr_data->words[nibl_count + 4]);
 407                   instr_data->address = ((instr_word & 0x7f00) << 16
 408                                          | (instr_long & 0xffff));
 409                   nibl_count += 7;
 410                   seg_length = 2;
 411                 }
 412               else
 413                 {
 414                   instr_data->address = ((instr_word & 0x7f00) << 16
 415                                          | (instr_word & 0x00ff));
 416                   nibl_count += 3;
 417                 }
 418             }
 419           else
 420             {
 421               instr_data->address = instr_word;
 422               nibl_count += 3;
 423             }
 424           break;
 425         case CLASS_0CCC:
 426         case CLASS_1CCC:
 427           instr_data->ctrl_code = instr_nibl & 0x7;
 428           break;
 429         case CLASS_0DISP7:
 430           instr_data->displacement =
 431             instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
 432           nibl_count += 1;
 433           break;
 434         case CLASS_1DISP7:
 435           instr_data->displacement =
 436             instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
 437           nibl_count += 1;
 438           break;
 439         case CLASS_01II:
 440           instr_data->interrupts = instr_nibl & 0x3;
 441           break;
 442         case CLASS_00II:
 443           instr_data->interrupts = instr_nibl & 0x3;
 444           break;
 445         case CLASS_IGNORE:
 446         case CLASS_BIT:
 447           instr_data->ctrl_code = instr_nibl & 0x7;
 448           break;
 449         case CLASS_FLAGS:
 450           instr_data->flags = instr_nibl;
 451           break;
 452         case CLASS_REG:
 453           instr_data->arg_reg[datum_value] = instr_nibl;
 454           break;
 455         case CLASS_REGN0:
 456           instr_data->arg_reg[datum_value] = instr_nibl;
 457           break;
 458         case CLASS_DISP8:
 459           instr_data->displacement =
 460             instr_data->insn_start + 2 + (signed char) instr_byte * 2;
 461           nibl_count += 1;
 462           break;
 463         case CLASS_BIT_1OR2:
 464           instr_data->immediate = ((instr_nibl >> 1) & 0x1) + 1;
 465           nibl_count += 1;
 466           break;
 467         default:
 468           abort ();
 469           break;
 470         }
 471
 472       loop += 1;
 473       nibl_count += 1;
 474     }
 475 }
 476
 477 static void
 478 print_intr(char *tmp_str, unsigned long interrupts)
 479 {
 480   int comma = 0;
 481
 482   *tmp_str = 0;
 483   if (! (interrupts & 2))
 484     {
 485       strcat (tmp_str, "vi");
 486       comma = 1;
 487     }
 488   if (! (interrupts & 1))
 489     {
 490       if (comma) strcat (tmp_str, ",");
 491       strcat (tmp_str, "nvi");
 492     }
 493 }
 494
 495 static void
 496 print_flags(char *tmp_str, unsigned long flags)
 497 {
 498   int comma = 0;
 499
 500   *tmp_str = 0;
 501   if (flags & 8)
 502     {
 503       strcat (tmp_str, "c");
 504       comma = 1;
 505     }
 506   if (flags & 4)
 507     {
 508       if (comma) strcat (tmp_str, ",");
 509       strcat (tmp_str, "z");
 510       comma = 1;
 511     }
 512   if (flags & 2)
 513     {
 514       if (comma) strcat (tmp_str, ",");
 515       strcat (tmp_str, "s");
 516       comma = 1;
 517     }
 518   if (flags & 1)
 519     {
 520       if (comma) strcat (tmp_str, ",");
 521       strcat (tmp_str, "p");
 522     }
 523 }
 524
 525 static void
 526 unparse_instr (instr_data_s *instr_data, int is_segmented)
 527 {
 528   unsigned short datum_value;
 529   unsigned int tabl_datum, datum_class;
 530   int loop, loop_limit;
 531   char out_str[80], tmp_str[25];
 532
 533   sprintf (out_str, "%s\t", z8k_table[instr_data->tabl_index].name);
 534
 535   loop_limit = z8k_table[instr_data->tabl_index].noperands;
 536   for (loop = 0; loop < loop_limit; loop++)
 537     {
 538       if (loop)
 539         strcat (out_str, ",");
 540
 541       tabl_datum = z8k_table[instr_data->tabl_index].arg_info[loop];
 542       datum_class = tabl_datum & CLASS_MASK;
 543       datum_value = tabl_datum & ~CLASS_MASK;
 544
 545       switch (datum_class)
 546         {
 547         case CLASS_X:
 548           sprintf (tmp_str, "0x%0lx(r%ld)", instr_data->address,
 549                    instr_data->arg_reg[datum_value]);
 550           strcat (out_str, tmp_str);
 551           break;
 552         case CLASS_BA:
 553           if (is_segmented)
 554             sprintf (tmp_str, "rr%ld(#0x%lx)", instr_data->arg_reg[datum_value],
 555                      instr_data->immediate);
 556           else
 557             sprintf (tmp_str, "r%ld(#0x%lx)", instr_data->arg_reg[datum_value],
 558                      instr_data->immediate);
 559           strcat (out_str, tmp_str);
 560           break;
 561         case CLASS_BX:
 562           if (is_segmented)
 563             sprintf (tmp_str, "rr%ld(r%ld)", instr_data->arg_reg[datum_value],
 564                      instr_data->arg_reg[ARG_RX]);
 565           else
 566             sprintf (tmp_str, "r%ld(r%ld)", instr_data->arg_reg[datum_value],
 567                      instr_data->arg_reg[ARG_RX]);
 568           strcat (out_str, tmp_str);
 569           break;
 570         case CLASS_DISP:
 571           sprintf (tmp_str, "0x%0lx", instr_data->displacement);
 572           strcat (out_str, tmp_str);
 573           break;
 574         case CLASS_IMM:
 575           if (datum_value == ARG_IMM2)  /* True with EI/DI instructions only.  */
 576             {
 577               print_intr (tmp_str, instr_data->interrupts);
 578               strcat (out_str, tmp_str);
 579               break;
 580             }
 581           sprintf (tmp_str, "#0x%0lx", instr_data->immediate);
 582           strcat (out_str, tmp_str);
 583           break;
 584         case CLASS_CC:
 585           sprintf (tmp_str, "%s", codes[instr_data->cond_code]);
 586           strcat (out_str, tmp_str);
 587           break;
 588         case CLASS_CTRL:
 589           sprintf (tmp_str, "%s", ctrl_names[instr_data->ctrl_code]);
 590           strcat (out_str, tmp_str);
 591           break;
 592         case CLASS_DA:
 593         case CLASS_ADDRESS:
 594           sprintf (tmp_str, "0x%0lx", instr_data->address);
 595           strcat (out_str, tmp_str);
 596           break;
 597         case CLASS_IR:
 598           if (is_segmented)
 599             sprintf (tmp_str, "@rr%ld", instr_data->arg_reg[datum_value]);
 600           else
 601             sprintf (tmp_str, "@r%ld", instr_data->arg_reg[datum_value]);
 602           strcat (out_str, tmp_str);
 603           break;
 604         case CLASS_IRO:
 605           sprintf (tmp_str, "@r%ld", instr_data->arg_reg[datum_value]);
 606           strcat (out_str, tmp_str);
 607           break;
 608         case CLASS_FLAGS:
 609           print_flags(tmp_str, instr_data->flags);
 610           strcat (out_str, tmp_str);
 611           break;
 612         case CLASS_REG_BYTE:
 613           if (instr_data->arg_reg[datum_value] >= 0x8)
 614             sprintf (tmp_str, "rl%ld",
 615                      instr_data->arg_reg[datum_value] - 0x8);
 616           else
 617             sprintf (tmp_str, "rh%ld", instr_data->arg_reg[datum_value]);
 618           strcat (out_str, tmp_str);
 619           break;
 620         case CLASS_REG_WORD:
 621           sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
 622           strcat (out_str, tmp_str);
 623           break;
 624         case CLASS_REG_QUAD:
 625           sprintf (tmp_str, "rq%ld", instr_data->arg_reg[datum_value]);
 626           strcat (out_str, tmp_str);
 627           break;
 628         case CLASS_REG_LONG:
 629           sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
 630           strcat (out_str, tmp_str);
 631           break;
 632         case CLASS_PR:
 633           if (is_segmented)
 634             sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
 635           else
 636             sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
 637           strcat (out_str, tmp_str);
 638           break;
 639         default:
 640           abort ();
 641           break;
 642         }
 643     }
 644
 645   strcpy (instr_data->instr_asmsrc, out_str);
 646 }