opcodes/z8k-dis.c

   1 /* Disassemble z8000 code.
   2    Copyright 1992, 1993, 1998, 2000, 2001
   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, USA.  */
  20
  21 #include "sysdep.h"
  22 #include "dis-asm.h"
  23
  24 #define DEFINE_TABLE
  25 #include "z8k-opc.h"
  26 \f
  27 #include <setjmp.h>
  28 \f
  29 typedef struct {
  30   /* These are all indexed by nibble number (i.e only every other entry
  31      of bytes is used, and every 4th entry of words).  */
  32   unsigned char nibbles[24];
  33   unsigned char bytes[24];
  34   unsigned short words[24];
  35
  36   /* Nibble number of first word not yet fetched.  */
  37   int max_fetched;
  38   bfd_vma insn_start;
  39   jmp_buf bailout;
  40
  41   long tabl_index;
  42   char instr_asmsrc[80];
  43   unsigned long arg_reg[0x0f];
  44   unsigned long immediate;
  45   unsigned long displacement;
  46   unsigned long address;
  47   unsigned long cond_code;
  48   unsigned long ctrl_code;
  49   unsigned long flags;
  50   unsigned long interrupts;
  51 } instr_data_s;
  52
  53 static int fetch_data PARAMS ((struct disassemble_info *, int));
  54
  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 (info, nibble)
  65      struct disassemble_info *info;
  66      int nibble;
  67 {
  68   unsigned char mybuf[20];
  69   int status;
  70   instr_data_s *priv = (instr_data_s *) info->private_data;
  71
  72   if ((nibble % 4) != 0)
  73     abort ();
  74
  75   status = (*info->read_memory_func) (priv->insn_start,
  76                                       (bfd_byte *) mybuf,
  77                                       nibble / 2,
  78                                       info);
  79   if (status != 0)
  80     {
  81       (*info->memory_error_func) (status, priv->insn_start, info);
  82       longjmp (priv->bailout, 1);
  83     }
  84
  85   {
  86     int i;
  87     unsigned char *p = mybuf;
  88
  89     for (i = 0; i < nibble;)
  90       {
  91         priv->words[i] = (p[0] << 8) | p[1];
  92
  93         priv->bytes[i] = *p;
  94         priv->nibbles[i++] = *p >> 4;
  95         priv->nibbles[i++] = *p & 0xf;
  96
  97         ++p;
  98         priv->bytes[i] = *p;
  99         priv->nibbles[i++] = *p >> 4;
 100         priv->nibbles[i++] = *p & 0xf;
 101
 102         ++p;
 103       }
 104   }
 105   priv->max_fetched = nibble;
 106   return 1;
 107 }
 108
 109 static char *codes[16] = {
 110   "f",
 111   "lt",
 112   "le",
 113   "ule",
 114   "ov/pe",
 115   "mi",
 116   "eq",
 117   "c/ult",
 118   "t",
 119   "ge",
 120   "gt",
 121   "ugt",
 122   "nov/po",
 123   "pl",
 124   "ne",
 125   "nc/uge"
 126 };
 127
 128 static char *ctrl_names[8] = {
 129   "<invld>",
 130   "flags",
 131   "fcw",
 132   "refresh",
 133   "psapseg",
 134   "psapoff",
 135   "nspseg",
 136   "nspoff"
 137 };
 138
 139 static int seg_length;
 140 static int print_insn_z8k PARAMS ((bfd_vma, disassemble_info *, int));
 141 int z8k_lookup_instr PARAMS ((unsigned char *, disassemble_info *));
 142 static void output_instr
 143   PARAMS ((instr_data_s *, unsigned long, disassemble_info *));
 144 static void unpack_instr PARAMS ((instr_data_s *, int, disassemble_info *));
 145 static void unparse_instr PARAMS ((instr_data_s *, int));
 146
 147 static int
 148 print_insn_z8k (addr, info, is_segmented)
 149      bfd_vma addr;
 150      disassemble_info *info;
 151      int is_segmented;
 152 {
 153   instr_data_s instr_data;
 154
 155   info->private_data = (PTR) &instr_data;
 156   instr_data.max_fetched = 0;
 157   instr_data.insn_start = addr;
 158   if (setjmp (instr_data.bailout) != 0)
 159     /* Error return.  */
 160     return -1;
 161
 162   instr_data.tabl_index = z8k_lookup_instr (instr_data.nibbles, info);
 163   if (instr_data.tabl_index > 0)
 164     {
 165       unpack_instr (&instr_data, is_segmented, info);
 166       unparse_instr (&instr_data, is_segmented);
 167       output_instr (&instr_data, addr, info);
 168       return z8k_table[instr_data.tabl_index].length + seg_length;
 169     }
 170   else
 171     {
 172       FETCH_DATA (info, 4);
 173       (*info->fprintf_func) (info->stream, ".word %02x%02x",
 174                              instr_data.bytes[0], instr_data.bytes[2]);
 175       return 2;
 176     }
 177 }
 178
 179 int
 180 print_insn_z8001 (addr, info)
 181      bfd_vma addr;
 182      disassemble_info *info;
 183 {
 184   return print_insn_z8k (addr, info, 1);
 185 }
 186
 187 int
 188 print_insn_z8002 (addr, info)
 189      bfd_vma addr;
 190      disassemble_info *info;
 191 {
 192   return print_insn_z8k (addr, info, 0);
 193 }
 194
 195 int
 196 z8k_lookup_instr (nibbles, info)
 197      unsigned char *nibbles;
 198      disassemble_info *info;
 199 {
 200
 201   int nibl_index, tabl_index;
 202   int nibl_matched;
 203   unsigned short instr_nibl;
 204   unsigned short tabl_datum, datum_class, datum_value;
 205
 206   nibl_matched = 0;
 207   tabl_index = 0;
 208   while (!nibl_matched && z8k_table[tabl_index].name)
 209     {
 210       nibl_matched = 1;
 211       for (nibl_index = 0;
 212            nibl_index < z8k_table[tabl_index].length * 2 && nibl_matched;
 213            nibl_index++)
 214         {
 215           if ((nibl_index % 4) == 0)
 216             /* Fetch one word at a time.  */
 217             FETCH_DATA (info, nibl_index + 4);
 218           instr_nibl = nibbles[nibl_index];
 219
 220           tabl_datum = z8k_table[tabl_index].byte_info[nibl_index];
 221           datum_class = tabl_datum & CLASS_MASK;
 222           datum_value = ~CLASS_MASK & tabl_datum;
 223
 224           switch (datum_class)
 225             {
 226             case CLASS_BIT:
 227               if (datum_value != instr_nibl)
 228                 nibl_matched = 0;
 229               break;
 230             case CLASS_00II:
 231               if (!((~instr_nibl) & 0x4))
 232                 nibl_matched = 0;
 233               break;
 234             case CLASS_01II:
 235               if (!(instr_nibl & 0x4))
 236                 nibl_matched = 0;
 237               break;
 238             case CLASS_0CCC:
 239               if (!((~instr_nibl) & 0x8))
 240                 nibl_matched = 0;
 241               break;
 242             case CLASS_1CCC:
 243               if (!(instr_nibl & 0x8))
 244                 nibl_matched = 0;
 245               break;
 246             case CLASS_0DISP7:
 247               if (!((~instr_nibl) & 0x8))
 248                 nibl_matched = 0;
 249               nibl_index += 1;
 250               break;
 251             case CLASS_1DISP7:
 252               if (!(instr_nibl & 0x8))
 253                 nibl_matched = 0;
 254               nibl_index += 1;
 255               break;
 256             case CLASS_REGN0:
 257               if (instr_nibl == 0)
 258                 nibl_matched = 0;
 259               break;
 260             case CLASS_BIT_1OR2:
 261               if ((instr_nibl | 0x2) != (datum_value | 0x2))
 262                 nibl_matched = 0;
 263               break;
 264             default:
 265               break;
 266             }
 267         }
 268       if (nibl_matched)
 269         {
 270           return tabl_index;
 271         }
 272
 273       tabl_index++;
 274     }
 275   return -1;
 276 }
 277
 278 static void
 279 output_instr (instr_data, addr, info)
 280      instr_data_s *instr_data;
 281      unsigned long addr ATTRIBUTE_UNUSED;
 282      disassemble_info *info;
 283 {
 284   int loop, loop_limit;
 285   char tmp_str[20];
 286   char out_str[100];
 287
 288   strcpy (out_str, "\t");
 289
 290   loop_limit = (z8k_table[instr_data->tabl_index].length + seg_length) * 2;
 291   FETCH_DATA (info, loop_limit);
 292   for (loop = 0; loop < loop_limit; loop++)
 293     {
 294       sprintf (tmp_str, "%x", instr_data->nibbles[loop]);
 295       strcat (out_str, tmp_str);
 296     }
 297
 298   while (loop++ < 8)
 299     {
 300       strcat (out_str, " ");
 301     }
 302
 303   strcat (out_str, instr_data->instr_asmsrc);
 304
 305   (*info->fprintf_func) (info->stream, "%s", out_str);
 306 }
 307
 308 static void
 309 unpack_instr (instr_data, is_segmented, info)
 310      instr_data_s *instr_data;
 311      int is_segmented;
 312      disassemble_info *info;
 313 {
 314   int nibl_count, loop;
 315   unsigned short instr_nibl, instr_byte, instr_word;
 316   long instr_long;
 317   unsigned int tabl_datum, datum_class;
 318   unsigned short datum_value;
 319
 320   nibl_count = 0;
 321   loop = 0;
 322   seg_length = 0;
 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                 {
 347                   /* neg. 12 bit displacement */
 348                   instr_data->displacement = instr_data->insn_start + 2
 349                     - (signed short) ((instr_word & 0xfff) | 0xf000) * 2;
 350                 }
 351               else
 352                 {
 353                   instr_data->displacement = instr_data->insn_start + 2
 354                     - (instr_word & 0x0fff) * 2;
 355                 }
 356               nibl_count += 2;
 357               break;
 358             default:
 359               break;
 360             }
 361           break;
 362         case CLASS_IMM:
 363           switch (datum_value)
 364             {
 365             case ARG_IMM4:
 366               instr_data->immediate = instr_nibl;
 367               break;
 368             case ARG_NIM8:
 369               instr_data->immediate = (-instr_byte);
 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_BIT:
 456           instr_data->ctrl_code = instr_nibl & 0x7;
 457           break;
 458         case CLASS_FLAGS:
 459           instr_data->flags = instr_nibl;
 460           break;
 461         case CLASS_REG:
 462           instr_data->arg_reg[datum_value] = instr_nibl;
 463           break;
 464         case CLASS_REGN0:
 465           instr_data->arg_reg[datum_value] = instr_nibl;
 466           break;
 467         case CLASS_DISP8:
 468           instr_data->displacement =
 469             instr_data->insn_start + 2 + (signed char) instr_byte * 2;
 470           nibl_count += 1;
 471           break;
 472         default:
 473           abort ();
 474           break;
 475         }
 476
 477       loop += 1;
 478       nibl_count += 1;
 479     }
 480 }
 481
 482 static void
 483 unparse_instr (instr_data, is_segmented)
 484      instr_data_s *instr_data;
 485      int is_segmented;
 486 {
 487   unsigned short datum_value;
 488   unsigned int tabl_datum, datum_class;
 489   int loop, loop_limit;
 490   char out_str[80], tmp_str[25];
 491
 492   sprintf (out_str, "\t%s\t", z8k_table[instr_data->tabl_index].name);
 493
 494   loop_limit = z8k_table[instr_data->tabl_index].noperands;
 495   for (loop = 0; loop < loop_limit; loop++)
 496     {
 497       if (loop)
 498         strcat (out_str, ",");
 499
 500       tabl_datum = z8k_table[instr_data->tabl_index].arg_info[loop];
 501       datum_class = tabl_datum & CLASS_MASK;
 502       datum_value = tabl_datum & ~CLASS_MASK;
 503
 504       switch (datum_class)
 505         {
 506         case CLASS_X:
 507           sprintf (tmp_str, "0x%0lx(R%ld)", instr_data->address,
 508                    instr_data->arg_reg[datum_value]);
 509           strcat (out_str, tmp_str);
 510           break;
 511         case CLASS_BA:
 512           sprintf (tmp_str, "r%ld(#%lx)", instr_data->arg_reg[datum_value],
 513                    instr_data->immediate);
 514           strcat (out_str, tmp_str);
 515           break;
 516         case CLASS_BX:
 517           sprintf (tmp_str, "r%ld(R%ld)", instr_data->arg_reg[datum_value],
 518                    instr_data->arg_reg[ARG_RX]);
 519           strcat (out_str, tmp_str);
 520           break;
 521         case CLASS_DISP:
 522           sprintf (tmp_str, "0x%0lx", instr_data->displacement);
 523           strcat (out_str, tmp_str);
 524           break;
 525         case CLASS_IMM:
 526           sprintf (tmp_str, "#0x%0lx", instr_data->immediate);
 527           strcat (out_str, tmp_str);
 528           break;
 529         case CLASS_CC:
 530           sprintf (tmp_str, "%s", codes[instr_data->cond_code]);
 531           strcat (out_str, tmp_str);
 532           break;
 533         case CLASS_CTRL:
 534           sprintf (tmp_str, "%s", ctrl_names[instr_data->ctrl_code]);
 535           strcat (out_str, tmp_str);
 536           break;
 537         case CLASS_DA:
 538         case CLASS_ADDRESS:
 539           sprintf (tmp_str, "0x%0lx", instr_data->address);
 540           strcat (out_str, tmp_str);
 541           break;
 542         case CLASS_IR:
 543           if (is_segmented)
 544             sprintf (tmp_str, "@rr%ld", instr_data->arg_reg[datum_value]);
 545           else
 546             sprintf (tmp_str, "@r%ld", instr_data->arg_reg[datum_value]);
 547           strcat (out_str, tmp_str);
 548           break;
 549         case CLASS_FLAGS:
 550           sprintf (tmp_str, "0x%0lx", instr_data->flags);
 551           strcat (out_str, tmp_str);
 552           break;
 553         case CLASS_REG_BYTE:
 554           if (instr_data->arg_reg[datum_value] >= 0x8)
 555             sprintf (tmp_str, "rl%ld",
 556                      instr_data->arg_reg[datum_value] - 0x8);
 557           else
 558             sprintf (tmp_str, "rh%ld", instr_data->arg_reg[datum_value]);
 559           strcat (out_str, tmp_str);
 560           break;
 561         case CLASS_REG_WORD:
 562           sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
 563           strcat (out_str, tmp_str);
 564           break;
 565         case CLASS_REG_QUAD:
 566           sprintf (tmp_str, "rq%ld", instr_data->arg_reg[datum_value]);
 567           strcat (out_str, tmp_str);
 568           break;
 569         case CLASS_REG_LONG:
 570           sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
 571           strcat (out_str, tmp_str);
 572           break;
 573         case CLASS_PR:
 574           if (is_segmented)
 575             sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
 576           else
 577             sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
 578           strcat (out_str, tmp_str);
 579           break;
 580         default:
 581           abort ();
 582           break;
 583         }
 584     }
 585
 586   strcpy (instr_data->instr_asmsrc, out_str);
 587 }