opcodes/z8k-dis.c

   1 /* Disassemble z8000 code.
   2    Copyright 1992, 1993, 1998, 2000
   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 {
  31   /* These are all indexed by nibble number (i.e only every other entry
  32      of bytes is used, and every 4th entry of words).  */
  33   unsigned char nibbles[24];
  34   unsigned char bytes[24];
  35   unsigned short words[24];
  36
  37   /* Nibble number of first word not yet fetched.  */
  38   int max_fetched;
  39   bfd_vma insn_start;
  40   jmp_buf bailout;
  41
  42   long tabl_index;
  43   char instr_asmsrc[80];
  44   unsigned long arg_reg[0x0f];
  45   unsigned long immediate;
  46   unsigned long displacement;
  47   unsigned long address;
  48   unsigned long cond_code;
  49   unsigned long ctrl_code;
  50   unsigned long flags;
  51   unsigned long interrupts;
  52 }
  53 instr_data_s;
  54
  55 /* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
  56    to ADDR (exclusive) are valid.  Returns 1 for success, longjmps
  57    on error.  */
  58 #define FETCH_DATA(info, nibble) \
  59   ((nibble) < ((instr_data_s *)(info->private_data))->max_fetched \
  60    ? 1 : fetch_data ((info), (nibble)))
  61
  62 static int
  63 fetch_data (info, nibble)
  64      struct disassemble_info *info;
  65      int nibble;
  66 {
  67   unsigned char mybuf[20];
  68   int status;
  69   instr_data_s *priv = (instr_data_s *) info->private_data;
  70
  71   if ((nibble % 4) != 0)
  72     abort ();
  73
  74   status = (*info->read_memory_func) (priv->insn_start,
  75                                       (bfd_byte *) mybuf,
  76                                       nibble / 2,
  77                                       info);
  78   if (status != 0)
  79     {
  80       (*info->memory_error_func) (status, priv->insn_start, info);
  81       longjmp (priv->bailout, 1);
  82     }
  83
  84   {
  85     int i;
  86     unsigned char *p = mybuf;
  87
  88     for (i = 0; i < nibble;)
  89       {
  90         priv->words[i] = (p[0] << 8) | p[1];
  91
  92         priv->bytes[i] = *p;
  93         priv->nibbles[i++] = *p >> 4;
  94         priv->nibbles[i++] = *p & 0xf;
  95
  96         ++p;
  97         priv->bytes[i] = *p;
  98         priv->nibbles[i++] = *p >> 4;
  99         priv->nibbles[i++] = *p & 0xf;
 100
 101         ++p;
 102       }
 103   }
 104   priv->max_fetched = nibble;
 105   return 1;
 106 }
 107
 108 static char *codes[16] =
 109 {
 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 {
 130   "<invld>",
 131   "flags",
 132   "fcw",
 133   "refresh",
 134   "psapseg",
 135   "psapoff",
 136   "nspseg",
 137   "nspoff"
 138 };
 139
 140 static int seg_length;
 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
 279 static void
 280 output_instr (instr_data, addr, info)
 281      instr_data_s *instr_data;
 282      unsigned long addr;
 283      disassemble_info *info;
 284 {
 285   int loop, loop_limit;
 286   char tmp_str[20];
 287   char out_str[100];
 288
 289   strcpy (out_str, "\t");
 290
 291   loop_limit = (z8k_table[instr_data->tabl_index].length + seg_length) * 2;
 292   FETCH_DATA (info, loop_limit);
 293   for (loop = 0; loop < loop_limit; loop++)
 294     {
 295       sprintf (tmp_str, "%x", instr_data->nibbles[loop]);
 296       strcat (out_str, tmp_str);
 297     }
 298
 299   while (loop++ < 8)
 300     {
 301       strcat (out_str, " ");
 302     }
 303
 304   strcat (out_str, instr_data->instr_asmsrc);
 305
 306   (*info->fprintf_func) (info->stream, "%s", out_str);
 307 }
 308
 309 static void
 310 unpack_instr (instr_data, is_segmented, info)
 311      instr_data_s *instr_data;
 312      int is_segmented;
 313      disassemble_info *info;
 314 {
 315   int nibl_count, loop;
 316   unsigned short instr_nibl, instr_byte, instr_word;
 317   long instr_long;
 318   unsigned int tabl_datum, datum_class;
 319   unsigned short datum_value;
 320
 321   nibl_count = 0;
 322   loop = 0;
 323   seg_length = 0;
 324   while (z8k_table[instr_data->tabl_index].byte_info[loop] != 0)
 325     {
 326       FETCH_DATA (info, nibl_count + 4 - (nibl_count % 4));
 327       instr_nibl = instr_data->nibbles[nibl_count];
 328       instr_byte = instr_data->bytes[nibl_count&~1];
 329       instr_word = instr_data->words[nibl_count&~3];
 330
 331       tabl_datum = z8k_table[instr_data->tabl_index].byte_info[loop];
 332       datum_class = tabl_datum & CLASS_MASK;
 333       datum_value = tabl_datum & ~CLASS_MASK;
 334
 335       switch (datum_class)
 336         {
 337         case CLASS_DISP:
 338           switch (datum_value)
 339             {
 340             case ARG_DISP16:
 341               instr_data->displacement = instr_data->insn_start + 4 +
 342                 (signed short)(instr_word & 0xffff);
 343               nibl_count += 3;
 344               break;
 345             case ARG_DISP12:
 346               if (instr_word & 0x800) {  /* neg. 12 bit displacement */
 347                 instr_data->displacement = instr_data->insn_start + 2 -
 348                   (signed short)((instr_word & 0xfff) | 0xf000) * 2;
 349               }
 350               else {
 351                 instr_data->displacement = instr_data->insn_start + 2 - (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_NIM8:
 366               instr_data->immediate = (-instr_byte);
 367               nibl_count += 1;
 368               break;
 369             case ARG_IMM8:
 370               instr_data->immediate = instr_byte;
 371               nibl_count += 1;
 372               break;
 373             case ARG_IMM16:
 374               instr_data->immediate = instr_word;
 375               nibl_count += 3;
 376               break;
 377             case ARG_IMM32:
 378               FETCH_DATA (info, nibl_count + 8);
 379               instr_long = (instr_data->words[nibl_count] << 16)
 380                 | (instr_data->words[nibl_count + 4]);
 381               instr_data->immediate = instr_long;
 382               nibl_count += 7;
 383               break;
 384             case ARG_IMMN:
 385               instr_data->immediate = instr_nibl - 1;
 386               break;
 387             case ARG_IMM4M1:
 388               instr_data->immediate = instr_nibl + 1;
 389               break;
 390             case ARG_IMM_1:
 391               instr_data->immediate = 1;
 392               break;
 393             case ARG_IMM_2:
 394               instr_data->immediate = 2;
 395               break;
 396             case ARG_IMM2:
 397               instr_data->immediate = instr_nibl & 0x3;
 398               break;
 399             default:
 400               break;
 401             }
 402           break;
 403         case CLASS_CC:
 404           instr_data->cond_code = instr_nibl;
 405           break;
 406         case CLASS_ADDRESS:
 407           if (is_segmented)
 408             {
 409               if (instr_nibl & 0x8)
 410                 {
 411                   FETCH_DATA (info, nibl_count + 8);
 412                   instr_long = (instr_data->words[nibl_count] << 16)
 413                     | (instr_data->words[nibl_count + 4]);
 414                   instr_data->address = ((instr_word & 0x7f00) << 8) +
 415                     (instr_long & 0xffff);
 416                   nibl_count += 7;
 417                   seg_length = 2;
 418                 }
 419               else
 420                 {
 421                   instr_data->address = ((instr_word & 0x7f00) << 8) +
 422                     (instr_word & 0x00ff);
 423                   nibl_count += 3;
 424                 }
 425             }
 426           else
 427             {
 428               instr_data->address = instr_word;
 429               nibl_count += 3;
 430             }
 431           break;
 432         case CLASS_0CCC:
 433         case CLASS_1CCC:
 434           instr_data->ctrl_code = instr_nibl & 0x7;
 435           break;
 436         case CLASS_0DISP7:
 437           instr_data->displacement = instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
 438           nibl_count += 1;
 439           break;
 440         case CLASS_1DISP7:
 441           instr_data->displacement = instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
 442           nibl_count += 1;
 443           break;
 444         case CLASS_01II:
 445           instr_data->interrupts = instr_nibl & 0x3;
 446           break;
 447         case CLASS_00II:
 448           instr_data->interrupts = instr_nibl & 0x3;
 449           break;
 450         case CLASS_BIT:
 451           instr_data->ctrl_code = instr_nibl & 0x7;
 452           break;
 453         case CLASS_FLAGS:
 454           instr_data->flags = instr_nibl;
 455           break;
 456         case CLASS_REG:
 457           instr_data->arg_reg[datum_value] = instr_nibl;
 458           break;
 459         case CLASS_REGN0:
 460           instr_data->arg_reg[datum_value] = instr_nibl;
 461           break;
 462         case CLASS_DISP8:
 463           instr_data->displacement = instr_data->insn_start + 2  + (signed char)instr_byte * 2;
 464           nibl_count += 1;
 465           break;
 466         default:
 467           abort ();
 468           break;
 469         }
 470
 471       loop += 1;
 472       nibl_count += 1;
 473     }
 474 }
 475
 476 static void
 477 unparse_instr (instr_data,is_segmented)
 478      instr_data_s *instr_data;
 479      int is_segmented;
 480 {
 481   unsigned short datum_value;
 482   unsigned int tabl_datum, datum_class;
 483   int loop, loop_limit;
 484   char out_str[80], tmp_str[25];
 485
 486   sprintf (out_str, "\t%s\t", z8k_table[instr_data->tabl_index].name);
 487
 488   loop_limit = z8k_table[instr_data->tabl_index].noperands;
 489   for (loop = 0; loop < loop_limit; loop++)
 490     {
 491       if (loop)
 492         strcat (out_str, ",");
 493
 494       tabl_datum = z8k_table[instr_data->tabl_index].arg_info[loop];
 495       datum_class = tabl_datum & CLASS_MASK;
 496       datum_value = tabl_datum & ~CLASS_MASK;
 497
 498       switch (datum_class)
 499         {
 500         case CLASS_X:
 501           sprintf (tmp_str, "0x%0lx(R%ld)", instr_data->address,
 502                    instr_data->arg_reg[datum_value]);
 503           strcat (out_str, tmp_str);
 504           break;
 505         case CLASS_BA:
 506           sprintf (tmp_str, "r%ld(#%lx)", instr_data->arg_reg[datum_value],
 507                    instr_data->immediate);
 508           strcat (out_str, tmp_str);
 509           break;
 510         case CLASS_BX:
 511           sprintf (tmp_str, "r%ld(R%ld)", instr_data->arg_reg[datum_value],
 512                    instr_data->arg_reg[ARG_RX]);
 513           strcat (out_str, tmp_str);
 514           break;
 515         case CLASS_DISP:
 516           sprintf (tmp_str, "0x%0lx", instr_data->displacement);
 517           strcat (out_str, tmp_str);
 518           break;
 519         case CLASS_IMM:
 520           sprintf (tmp_str, "#0x%0lx", instr_data->immediate);
 521           strcat (out_str, tmp_str);
 522           break;
 523         case CLASS_CC:
 524           sprintf (tmp_str, "%s", codes[instr_data->cond_code]);
 525           strcat (out_str, tmp_str);
 526           break;
 527         case CLASS_CTRL:
 528           sprintf (tmp_str, "%s", ctrl_names[instr_data->ctrl_code]);
 529           strcat (out_str, tmp_str);
 530           break;
 531         case CLASS_DA:
 532         case CLASS_ADDRESS:
 533           sprintf (tmp_str, "0x%0lx", instr_data->address);
 534           strcat (out_str, tmp_str);
 535           break;
 536         case CLASS_IR:
 537           sprintf (tmp_str, "@R%ld", instr_data->arg_reg[datum_value]);
 538           strcat (out_str, tmp_str);
 539           break;
 540         case CLASS_FLAGS:
 541           sprintf (tmp_str, "0x%0lx", instr_data->flags);
 542           strcat (out_str, tmp_str);
 543           break;
 544         case CLASS_REG_BYTE:
 545           if (instr_data->arg_reg[datum_value] >= 0x8)
 546             {
 547               sprintf (tmp_str, "rl%ld",
 548                        instr_data->arg_reg[datum_value] - 0x8);
 549             }
 550           else
 551             {
 552               sprintf (tmp_str, "rh%ld", instr_data->arg_reg[datum_value]);
 553             }
 554           strcat (out_str, tmp_str);
 555           break;
 556         case CLASS_REG_WORD:
 557           sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
 558           strcat (out_str, tmp_str);
 559           break;
 560         case CLASS_REG_QUAD:
 561           sprintf (tmp_str, "rq%ld", instr_data->arg_reg[datum_value]);
 562           strcat (out_str, tmp_str);
 563           break;
 564         case CLASS_REG_LONG:
 565           sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
 566           strcat (out_str, tmp_str);
 567           break;
 568         case CLASS_PR:
 569           if (is_segmented)
 570             sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
 571           else
 572             sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
 573           strcat (out_str, tmp_str);
 574           break;
 575         default:
 576           abort ();
 577           break;
 578         }
 579     }
 580
 581   strcpy (instr_data->instr_asmsrc, out_str);
 582 }