gas/config/tc-i386-intel.c

   1 /* tc-i386.c -- Assemble Intel syntax code for ix86/x86-64
   2    Copyright (C) 2009-2018 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS 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    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to the Free
  18    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  19    02110-1301, USA.  */
  20
  21 static struct
  22   {
  23     operatorT op_modifier;      /* Operand modifier.  */
  24     int is_mem;                 /* 1 if operand is memory reference.  */
  25     int is_indirect;            /* 1 if operand is indirect reference.  */
  26     int has_offset;             /* 1 if operand has offset.  */
  27     unsigned int in_offset;     /* >=1 if processing operand of offset.  */
  28     unsigned int in_bracket;    /* >=1 if processing operand in brackets.  */
  29     unsigned int in_scale;      /* >=1 if processing multiplication operand
  30                                  * in brackets.  */
  31     i386_operand_type reloc_types;      /* Value obtained from lex_got().  */
  32     const reg_entry *base;      /* Base register (if any).  */
  33     const reg_entry *index;     /* Index register (if any).  */
  34     offsetT scale_factor;       /* Accumulated scale factor.  */
  35     symbolS *seg;
  36   }
  37 intel_state;
  38
  39 /* offset X_add_symbol */
  40 #define O_offset O_md32
  41 /* offset X_add_symbol */
  42 #define O_short O_md31
  43 /* near ptr X_add_symbol */
  44 #define O_near_ptr O_md30
  45 /* far ptr X_add_symbol */
  46 #define O_far_ptr O_md29
  47 /* byte ptr X_add_symbol */
  48 #define O_byte_ptr O_md28
  49 /* word ptr X_add_symbol */
  50 #define O_word_ptr O_md27
  51 /* dword ptr X_add_symbol */
  52 #define O_dword_ptr O_md26
  53 /* qword ptr X_add_symbol */
  54 #define O_qword_ptr O_md25
  55 /* oword ptr X_add_symbol */
  56 #define O_oword_ptr O_md24
  57 /* fword ptr X_add_symbol */
  58 #define O_fword_ptr O_md23
  59 /* tbyte ptr X_add_symbol */
  60 #define O_tbyte_ptr O_md22
  61 /* xmmword ptr X_add_symbol */
  62 #define O_xmmword_ptr O_md21
  63 /* ymmword ptr X_add_symbol */
  64 #define O_ymmword_ptr O_md20
  65 /* zmmword ptr X_add_symbol */
  66 #define O_zmmword_ptr O_md19
  67
  68 static struct
  69   {
  70     const char *name;
  71     operatorT op;
  72     unsigned int operands;
  73   }
  74 const i386_operators[] =
  75   {
  76     { "and", O_bit_and, 2 },
  77     { "eq", O_eq, 2 },
  78     { "ge", O_ge, 2 },
  79     { "gt", O_gt, 2 },
  80     { "le", O_le, 2 },
  81     { "lt", O_lt, 2 },
  82     { "mod", O_modulus, 2 },
  83     { "ne", O_ne, 2 },
  84     { "not", O_bit_not, 1 },
  85     { "offset", O_offset, 1 },
  86     { "or", O_bit_inclusive_or, 2 },
  87     { "shl", O_left_shift, 2 },
  88     { "short", O_short, 1 },
  89     { "shr", O_right_shift, 2 },
  90     { "xor", O_bit_exclusive_or, 2 },
  91     { NULL, O_illegal, 0 }
  92   };
  93
  94 static struct
  95   {
  96     const char *name;
  97     operatorT op;
  98     unsigned short sz[3];
  99   }
 100 const i386_types[] =
 101   {
 102 #define I386_TYPE(t, n) { #t, O_##t##_ptr, { n, n, n } }
 103     I386_TYPE(byte, 1),
 104     I386_TYPE(word, 2),
 105     I386_TYPE(dword, 4),
 106     I386_TYPE(fword, 6),
 107     I386_TYPE(qword, 8),
 108     I386_TYPE(tbyte, 10),
 109     I386_TYPE(oword, 16),
 110     I386_TYPE(xmmword, 16),
 111     I386_TYPE(ymmword, 32),
 112     I386_TYPE(zmmword, 64),
 113 #undef I386_TYPE
 114     { "near", O_near_ptr, { 0xff04, 0xff02, 0xff08 } },
 115     { "far", O_far_ptr, { 0xff06, 0xff05, 0xff06 } },
 116     { NULL, O_illegal, { 0, 0, 0 } }
 117   };
 118
 119 operatorT i386_operator (const char *name, unsigned int operands, char *pc)
 120 {
 121   unsigned int j;
 122
 123   if (!intel_syntax)
 124     return O_absent;
 125
 126   if (!name)
 127     {
 128       if (operands != 2)
 129         return O_illegal;
 130       switch (*input_line_pointer)
 131         {
 132         case ':':
 133           ++input_line_pointer;
 134           return O_full_ptr;
 135         case '[':
 136           ++input_line_pointer;
 137           return O_index;
 138         case '@':
 139           if (this_operand >= 0 && i.reloc[this_operand] == NO_RELOC)
 140             {
 141               int adjust = 0;
 142               char *gotfree_input_line = lex_got (&i.reloc[this_operand],
 143                                                   &adjust,
 144                                                   &intel_state.reloc_types);
 145
 146               if (!gotfree_input_line)
 147                 break;
 148               free (gotfree_input_line);
 149               *input_line_pointer++ = '+';
 150               memset (input_line_pointer, '0', adjust - 1);
 151               input_line_pointer[adjust - 1] = ' ';
 152               return O_add;
 153             }
 154           break;
 155         }
 156       return O_illegal;
 157     }
 158
 159   for (j = 0; i386_operators[j].name; ++j)
 160     if (strcasecmp (i386_operators[j].name, name) == 0)
 161       {
 162         if (i386_operators[j].operands
 163             && i386_operators[j].operands != operands)
 164           return O_illegal;
 165         return i386_operators[j].op;
 166       }
 167
 168   for (j = 0; i386_types[j].name; ++j)
 169     if (strcasecmp (i386_types[j].name, name) == 0)
 170       break;
 171
 172   if (i386_types[j].name && *pc == ' ')
 173     {
 174       char *pname;
 175       char c;
 176
 177       ++input_line_pointer;
 178       c = get_symbol_name (&pname);
 179
 180       if (strcasecmp (pname, "ptr") == 0)
 181         {
 182           /* FIXME: What if c == '"' ?  */
 183           pname[-1] = *pc;
 184           *pc = c;
 185           if (intel_syntax > 0 || operands != 1)
 186             return O_illegal;
 187           return i386_types[j].op;
 188         }
 189
 190       (void) restore_line_pointer (c);
 191       input_line_pointer = pname - 1;
 192     }
 193
 194   return O_absent;
 195 }
 196
 197 static int i386_intel_parse_name (const char *name, expressionS *e)
 198 {
 199   unsigned int j;
 200
 201   if (! strcmp (name, "$"))
 202     {
 203       current_location (e);
 204       return 1;
 205     }
 206
 207   for (j = 0; i386_types[j].name; ++j)
 208     if (strcasecmp(i386_types[j].name, name) == 0)
 209       {
 210         e->X_op = O_constant;
 211         e->X_add_number = i386_types[j].sz[flag_code];
 212         e->X_add_symbol = NULL;
 213         e->X_op_symbol = NULL;
 214         return 1;
 215       }
 216
 217   return 0;
 218 }
 219
 220 static INLINE int i386_intel_check (const reg_entry *rreg,
 221                                     const reg_entry *base,
 222                                     const reg_entry *iindex)
 223 {
 224   if ((this_operand >= 0
 225        && rreg != i.op[this_operand].regs)
 226       || base != intel_state.base
 227       || iindex != intel_state.index)
 228     {
 229       as_bad (_("invalid use of register"));
 230       return 0;
 231     }
 232   return 1;
 233 }
 234
 235 static INLINE void i386_intel_fold (expressionS *e, symbolS *sym)
 236 {
 237   expressionS *exp = symbol_get_value_expression (sym);
 238   if (S_GET_SEGMENT (sym) == absolute_section)
 239     {
 240       offsetT val = e->X_add_number;
 241
 242       *e = *exp;
 243       e->X_add_number += val;
 244     }
 245   else
 246     {
 247       if (exp->X_op == O_symbol
 248           && strcmp (S_GET_NAME (exp->X_add_symbol),
 249                      GLOBAL_OFFSET_TABLE_NAME) == 0)
 250         sym = exp->X_add_symbol;
 251       e->X_add_symbol = sym;
 252       e->X_op_symbol = NULL;
 253       e->X_op = O_symbol;
 254     }
 255 }
 256
 257 static int
 258 i386_intel_simplify_register (expressionS *e)
 259 {
 260   int reg_num;
 261
 262   if (this_operand < 0 || intel_state.in_offset)
 263     {
 264       as_bad (_("invalid use of register"));
 265       return 0;
 266     }
 267
 268   if (e->X_op == O_register)
 269     reg_num = e->X_add_number;
 270   else
 271     reg_num = e->X_md - 1;
 272
 273   if (!intel_state.in_bracket)
 274     {
 275       if (i.op[this_operand].regs)
 276         {
 277           as_bad (_("invalid use of register"));
 278           return 0;
 279         }
 280       if (i386_regtab[reg_num].reg_type.bitfield.sreg3
 281           && i386_regtab[reg_num].reg_num == RegFlat)
 282         {
 283           as_bad (_("invalid use of pseudo-register"));
 284           return 0;
 285         }
 286       i.op[this_operand].regs = i386_regtab + reg_num;
 287     }
 288   else if (!intel_state.index
 289            && (i386_regtab[reg_num].reg_type.bitfield.xmmword
 290                || i386_regtab[reg_num].reg_type.bitfield.ymmword
 291                || i386_regtab[reg_num].reg_type.bitfield.zmmword
 292                || i386_regtab[reg_num].reg_num == RegRiz
 293                || i386_regtab[reg_num].reg_num == RegEiz))
 294     intel_state.index = i386_regtab + reg_num;
 295   else if (!intel_state.base && !intel_state.in_scale)
 296     intel_state.base = i386_regtab + reg_num;
 297   else if (!intel_state.index)
 298     {
 299       if (intel_state.in_scale
 300           || current_templates->start->base_opcode == 0xf30f1b /* bndmk */
 301           || (current_templates->start->base_opcode & ~1) == 0x0f1a /* bnd{ld,st}x */
 302           || i386_regtab[reg_num].reg_type.bitfield.baseindex)
 303         intel_state.index = i386_regtab + reg_num;
 304       else
 305         {
 306           /* Convert base to index and make ESP/RSP the base.  */
 307           intel_state.index = intel_state.base;
 308           intel_state.base = i386_regtab + reg_num;
 309         }
 310     }
 311   else
 312     {
 313       /* esp is invalid as index */
 314       intel_state.index = i386_regtab + REGNAM_EAX + ESP_REG_NUM;
 315     }
 316   return 2;
 317 }
 318
 319 static int i386_intel_simplify (expressionS *);
 320
 321 static INLINE int i386_intel_simplify_symbol(symbolS *sym)
 322 {
 323   int ret = i386_intel_simplify (symbol_get_value_expression (sym));
 324
 325   if (ret == 2)
 326   {
 327     S_SET_SEGMENT(sym, absolute_section);
 328     ret = 1;
 329   }
 330   return ret;
 331 }
 332
 333 static int i386_intel_simplify (expressionS *e)
 334 {
 335   const reg_entry *the_reg = (this_operand >= 0
 336                               ? i.op[this_operand].regs : NULL);
 337   const reg_entry *base = intel_state.base;
 338   const reg_entry *state_index = intel_state.index;
 339   int ret;
 340
 341   if (!intel_syntax)
 342     return 1;
 343
 344   switch (e->X_op)
 345     {
 346     case O_index:
 347       if (e->X_add_symbol)
 348         {
 349           if (!i386_intel_simplify_symbol (e->X_add_symbol)
 350               || !i386_intel_check(the_reg, intel_state.base,
 351                                    intel_state.index))
 352             return 0;
 353         }
 354       if (!intel_state.in_offset)
 355         ++intel_state.in_bracket;
 356       ret = i386_intel_simplify_symbol (e->X_op_symbol);
 357       if (!intel_state.in_offset)
 358         --intel_state.in_bracket;
 359       if (!ret)
 360         return 0;
 361       if (e->X_add_symbol)
 362         e->X_op = O_add;
 363       else
 364         i386_intel_fold (e, e->X_op_symbol);
 365       break;
 366
 367     case O_offset:
 368       intel_state.has_offset = 1;
 369       ++intel_state.in_offset;
 370       ret = i386_intel_simplify_symbol (e->X_add_symbol);
 371       --intel_state.in_offset;
 372       if (!ret || !i386_intel_check(the_reg, base, state_index))
 373         return 0;
 374       i386_intel_fold (e, e->X_add_symbol);
 375       return ret;
 376
 377     case O_byte_ptr:
 378     case O_word_ptr:
 379     case O_dword_ptr:
 380     case O_fword_ptr:
 381     case O_qword_ptr:
 382     case O_tbyte_ptr:
 383     case O_oword_ptr:
 384     case O_xmmword_ptr:
 385     case O_ymmword_ptr:
 386     case O_zmmword_ptr:
 387     case O_near_ptr:
 388     case O_far_ptr:
 389       if (intel_state.op_modifier == O_absent)
 390         intel_state.op_modifier = e->X_op;
 391       /* FALLTHROUGH */
 392     case O_short:
 393       if (symbol_get_value_expression (e->X_add_symbol)->X_op
 394           == O_register)
 395         {
 396           as_bad (_("invalid use of register"));
 397           return 0;
 398         }
 399       if (!i386_intel_simplify_symbol (e->X_add_symbol))
 400         return 0;
 401       i386_intel_fold (e, e->X_add_symbol);
 402       break;
 403
 404     case O_full_ptr:
 405       if (symbol_get_value_expression (e->X_op_symbol)->X_op
 406           == O_register)
 407         {
 408           as_bad (_("invalid use of register"));
 409           return 0;
 410         }
 411       if (!i386_intel_simplify_symbol (e->X_op_symbol)
 412           || !i386_intel_check(the_reg, intel_state.base,
 413                                intel_state.index))
 414         return 0;
 415       if (!intel_state.in_offset)
 416         {
 417           if (!intel_state.seg)
 418             intel_state.seg = e->X_add_symbol;
 419           else
 420             {
 421               expressionS exp;
 422
 423               exp.X_op = O_full_ptr;
 424               exp.X_add_symbol = e->X_add_symbol;
 425               exp.X_op_symbol = intel_state.seg;
 426               intel_state.seg = make_expr_symbol (&exp);
 427             }
 428         }
 429       i386_intel_fold (e, e->X_op_symbol);
 430       break;
 431
 432     case O_multiply:
 433       if (this_operand >= 0 && intel_state.in_bracket)
 434         {
 435           expressionS *scale = NULL;
 436           int has_index = (intel_state.index != NULL);
 437
 438           if (!intel_state.in_scale++)
 439             intel_state.scale_factor = 1;
 440
 441           ret = i386_intel_simplify_symbol (e->X_add_symbol);
 442           if (ret && !has_index && intel_state.index)
 443             scale = symbol_get_value_expression (e->X_op_symbol);
 444
 445           if (ret)
 446             ret = i386_intel_simplify_symbol (e->X_op_symbol);
 447           if (ret && !scale && !has_index && intel_state.index)
 448             scale = symbol_get_value_expression (e->X_add_symbol);
 449
 450           if (ret && scale)
 451             {
 452               resolve_expression (scale);
 453               if (scale->X_op != O_constant
 454                   || intel_state.index->reg_type.bitfield.word)
 455                 scale->X_add_number = 0;
 456               intel_state.scale_factor *= scale->X_add_number;
 457             }
 458
 459           --intel_state.in_scale;
 460           if (!ret)
 461             return 0;
 462
 463           if (!intel_state.in_scale)
 464             switch (intel_state.scale_factor)
 465               {
 466               case 1:
 467                 i.log2_scale_factor = 0;
 468                 break;
 469               case 2:
 470                 i.log2_scale_factor = 1;
 471                 break;
 472               case 4:
 473                 i.log2_scale_factor = 2;
 474                 break;
 475               case 8:
 476                 i.log2_scale_factor = 3;
 477                 break;
 478               default:
 479                 /* esp is invalid as index */
 480                 intel_state.index = i386_regtab + REGNAM_EAX + ESP_REG_NUM;
 481                 break;
 482               }
 483
 484           break;
 485         }
 486       goto fallthrough;
 487
 488     case O_register:
 489       ret = i386_intel_simplify_register (e);
 490       if (ret == 2)
 491         {
 492           gas_assert (e->X_add_number < (unsigned short) -1);
 493           e->X_md = (unsigned short) e->X_add_number + 1;
 494           e->X_op = O_constant;
 495           e->X_add_number = 0;
 496         }
 497       return ret;
 498
 499     case O_constant:
 500       if (e->X_md)
 501         return i386_intel_simplify_register (e);
 502
 503       /* FALLTHROUGH */
 504     default:
 505 fallthrough:
 506       if (e->X_add_symbol
 507           && !i386_intel_simplify_symbol (e->X_add_symbol))
 508         return 0;
 509       if (e->X_op == O_add || e->X_op == O_subtract)
 510         {
 511           base = intel_state.base;
 512           state_index = intel_state.index;
 513         }
 514       if (!i386_intel_check (the_reg, base, state_index)
 515           || (e->X_op_symbol
 516               && !i386_intel_simplify_symbol (e->X_op_symbol))
 517           || !i386_intel_check (the_reg,
 518                                 (e->X_op != O_add
 519                                  ? base : intel_state.base),
 520                                 (e->X_op != O_add
 521                                  ? state_index : intel_state.index)))
 522         return 0;
 523       break;
 524     }
 525
 526   if (this_operand >= 0
 527       && e->X_op == O_symbol
 528       && !intel_state.in_offset)
 529     {
 530       segT seg = S_GET_SEGMENT (e->X_add_symbol);
 531
 532       if (seg != absolute_section
 533           && seg != reg_section
 534           && seg != expr_section)
 535         intel_state.is_mem |= 2 - !intel_state.in_bracket;
 536     }
 537
 538   return 1;
 539 }
 540
 541 int i386_need_index_operator (void)
 542 {
 543   return intel_syntax < 0;
 544 }
 545
 546 static int
 547 i386_intel_operand (char *operand_string, int got_a_float)
 548 {
 549   char *saved_input_line_pointer, *buf;
 550   segT exp_seg;
 551   expressionS exp, *expP;
 552   char suffix = 0;
 553   int ret;
 554
 555   /* Handle vector immediates.  */
 556   if (RC_SAE_immediate (operand_string))
 557     return 1;
 558
 559   /* Initialize state structure.  */
 560   intel_state.op_modifier = O_absent;
 561   intel_state.is_mem = 0;
 562   intel_state.is_indirect = 0;
 563   intel_state.has_offset = 0;
 564   intel_state.base = NULL;
 565   intel_state.index = NULL;
 566   intel_state.seg = NULL;
 567   operand_type_set (&intel_state.reloc_types, ~0);
 568   gas_assert (!intel_state.in_offset);
 569   gas_assert (!intel_state.in_bracket);
 570   gas_assert (!intel_state.in_scale);
 571
 572   saved_input_line_pointer = input_line_pointer;
 573   input_line_pointer = buf = xstrdup (operand_string);
 574
 575   intel_syntax = -1;
 576   memset (&exp, 0, sizeof(exp));
 577   exp_seg = expression (&exp);
 578   ret = i386_intel_simplify (&exp);
 579   intel_syntax = 1;
 580
 581   SKIP_WHITESPACE ();
 582
 583   /* Handle vector operations.  */
 584   if (*input_line_pointer == '{')
 585     {
 586       char *end = check_VecOperations (input_line_pointer, NULL);
 587       if (end)
 588         input_line_pointer = end;
 589       else
 590         ret = 0;
 591     }
 592
 593   if (!is_end_of_line[(unsigned char) *input_line_pointer])
 594     {
 595       if (ret)
 596         as_bad (_("junk `%s' after expression"), input_line_pointer);
 597       ret = 0;
 598     }
 599   else if (exp.X_op == O_illegal || exp.X_op == O_absent)
 600     {
 601       if (ret)
 602         as_bad (_("invalid expression"));
 603       ret = 0;
 604     }
 605   else if (!intel_state.has_offset
 606            && input_line_pointer > buf
 607            && *(input_line_pointer - 1) == ']')
 608     {
 609       intel_state.is_mem |= 1;
 610       intel_state.is_indirect = 1;
 611     }
 612
 613   input_line_pointer = saved_input_line_pointer;
 614   free (buf);
 615
 616   gas_assert (!intel_state.in_offset);
 617   gas_assert (!intel_state.in_bracket);
 618   gas_assert (!intel_state.in_scale);
 619
 620   if (!ret)
 621     return 0;
 622
 623   if (intel_state.op_modifier != O_absent
 624       && current_templates->start->base_opcode != 0x8d /* lea */)
 625     {
 626       i.types[this_operand].bitfield.unspecified = 0;
 627
 628       switch (intel_state.op_modifier)
 629         {
 630         case O_byte_ptr:
 631           i.types[this_operand].bitfield.byte = 1;
 632           suffix = BYTE_MNEM_SUFFIX;
 633           break;
 634
 635         case O_word_ptr:
 636           i.types[this_operand].bitfield.word = 1;
 637           if ((current_templates->start->name[0] == 'l'
 638                && current_templates->start->name[2] == 's'
 639                && current_templates->start->name[3] == 0)
 640               || current_templates->start->base_opcode == 0x62 /* bound */)
 641             suffix = BYTE_MNEM_SUFFIX; /* so it will cause an error */
 642           else if (got_a_float == 2)    /* "fi..." */
 643             suffix = SHORT_MNEM_SUFFIX;
 644           else
 645             suffix = WORD_MNEM_SUFFIX;
 646           break;
 647
 648         case O_dword_ptr:
 649           i.types[this_operand].bitfield.dword = 1;
 650           if ((current_templates->start->name[0] == 'l'
 651                && current_templates->start->name[2] == 's'
 652                && current_templates->start->name[3] == 0)
 653               || current_templates->start->base_opcode == 0x62 /* bound */)
 654             suffix = WORD_MNEM_SUFFIX;
 655           else if (flag_code == CODE_16BIT
 656                    && (current_templates->start->opcode_modifier.jump
 657                        || current_templates->start->opcode_modifier.jumpdword))
 658             suffix = LONG_DOUBLE_MNEM_SUFFIX;
 659           else if (got_a_float == 1)    /* "f..." */
 660             suffix = SHORT_MNEM_SUFFIX;
 661           else
 662             suffix = LONG_MNEM_SUFFIX;
 663           break;
 664
 665         case O_fword_ptr:
 666           i.types[this_operand].bitfield.fword = 1;
 667           if (current_templates->start->name[0] == 'l'
 668               && current_templates->start->name[2] == 's'
 669               && current_templates->start->name[3] == 0)
 670             suffix = LONG_MNEM_SUFFIX;
 671           else if (!got_a_float)
 672             {
 673               if (flag_code == CODE_16BIT)
 674                 add_prefix (DATA_PREFIX_OPCODE);
 675               suffix = LONG_DOUBLE_MNEM_SUFFIX;
 676             }
 677           else
 678             suffix = BYTE_MNEM_SUFFIX; /* so it will cause an error */
 679           break;
 680
 681         case O_qword_ptr:
 682           i.types[this_operand].bitfield.qword = 1;
 683           if (current_templates->start->base_opcode == 0x62 /* bound */
 684               || got_a_float == 1)      /* "f..." */
 685             suffix = LONG_MNEM_SUFFIX;
 686           else
 687             suffix = QWORD_MNEM_SUFFIX;
 688           break;
 689
 690         case O_tbyte_ptr:
 691           i.types[this_operand].bitfield.tbyte = 1;
 692           if (got_a_float == 1)
 693             suffix = LONG_DOUBLE_MNEM_SUFFIX;
 694           else
 695             suffix = BYTE_MNEM_SUFFIX; /* so it will cause an error */
 696           break;
 697
 698         case O_oword_ptr:
 699         case O_xmmword_ptr:
 700           i.types[this_operand].bitfield.xmmword = 1;
 701           break;
 702
 703         case O_ymmword_ptr:
 704           i.types[this_operand].bitfield.ymmword = 1;
 705           break;
 706
 707         case O_zmmword_ptr:
 708           i.types[this_operand].bitfield.zmmword = 1;
 709           break;
 710
 711         case O_far_ptr:
 712           suffix = LONG_DOUBLE_MNEM_SUFFIX;
 713           /* FALLTHROUGH */
 714         case O_near_ptr:
 715           if (!current_templates->start->opcode_modifier.jump
 716               && !current_templates->start->opcode_modifier.jumpdword)
 717             suffix = got_a_float /* so it will cause an error */
 718                      ? BYTE_MNEM_SUFFIX
 719                      : LONG_DOUBLE_MNEM_SUFFIX;
 720           break;
 721
 722         default:
 723           BAD_CASE (intel_state.op_modifier);
 724           break;
 725         }
 726
 727       if (!i.suffix)
 728         i.suffix = suffix;
 729       else if (i.suffix != suffix)
 730         {
 731           as_bad (_("conflicting operand size modifiers"));
 732           return 0;
 733         }
 734     }
 735
 736   /* Operands for jump/call need special consideration.  */
 737   if (current_templates->start->opcode_modifier.jump
 738       || current_templates->start->opcode_modifier.jumpdword
 739       || current_templates->start->opcode_modifier.jumpintersegment)
 740     {
 741       if (i.op[this_operand].regs
 742           || intel_state.base
 743           || intel_state.index
 744           || intel_state.is_mem > 1)
 745         i.types[this_operand].bitfield.jumpabsolute = 1;
 746       else
 747         switch (intel_state.op_modifier)
 748           {
 749           case O_near_ptr:
 750             if (intel_state.seg)
 751               i.types[this_operand].bitfield.jumpabsolute = 1;
 752             else
 753               intel_state.is_mem = 1;
 754             break;
 755           case O_far_ptr:
 756           case O_absent:
 757             if (!intel_state.seg)
 758               {
 759                 intel_state.is_mem = 1;
 760                 if (intel_state.op_modifier == O_absent)
 761                   {
 762                     if (intel_state.is_indirect == 1)
 763                       i.types[this_operand].bitfield.jumpabsolute = 1;
 764                     break;
 765                   }
 766                 as_bad (_("cannot infer the segment part of the operand"));
 767                 return 0;
 768               }
 769             else if (S_GET_SEGMENT (intel_state.seg) == reg_section)
 770               i.types[this_operand].bitfield.jumpabsolute = 1;
 771             else
 772               {
 773                 i386_operand_type types;
 774
 775                 if (i.imm_operands >= MAX_IMMEDIATE_OPERANDS)
 776                   {
 777                     as_bad (_("at most %d immediate operands are allowed"),
 778                             MAX_IMMEDIATE_OPERANDS);
 779                     return 0;
 780                   }
 781                 expP = &im_expressions[i.imm_operands++];
 782                 memset (expP, 0, sizeof(*expP));
 783                 expP->X_op = O_symbol;
 784                 expP->X_add_symbol = intel_state.seg;
 785                 i.op[this_operand].imms = expP;
 786
 787                 resolve_expression (expP);
 788                 operand_type_set (&types, ~0);
 789                 if (!i386_finalize_immediate (S_GET_SEGMENT (intel_state.seg),
 790                                               expP, types, operand_string))
 791                   return 0;
 792                 if (i.operands < MAX_OPERANDS)
 793                   {
 794                     this_operand = i.operands++;
 795                     i.types[this_operand].bitfield.unspecified = 1;
 796                   }
 797                 if (suffix == LONG_DOUBLE_MNEM_SUFFIX)
 798                   i.suffix = 0;
 799                 intel_state.seg = NULL;
 800                 intel_state.is_mem = 0;
 801               }
 802             break;
 803           default:
 804             i.types[this_operand].bitfield.jumpabsolute = 1;
 805             break;
 806           }
 807       if (i.types[this_operand].bitfield.jumpabsolute)
 808         intel_state.is_mem |= 1;
 809     }
 810   else if (intel_state.seg)
 811     intel_state.is_mem |= 1;
 812
 813   if (i.op[this_operand].regs)
 814     {
 815       i386_operand_type temp;
 816
 817       /* Register operand.  */
 818       if (intel_state.base || intel_state.index || intel_state.seg)
 819         {
 820           as_bad (_("invalid operand"));
 821           return 0;
 822         }
 823
 824       temp = i.op[this_operand].regs->reg_type;
 825       temp.bitfield.baseindex = 0;
 826       i.types[this_operand] = operand_type_or (i.types[this_operand],
 827                                                temp);
 828       i.types[this_operand].bitfield.unspecified = 0;
 829       ++i.reg_operands;
 830     }
 831   else if (intel_state.base
 832            || intel_state.index
 833            || intel_state.seg
 834            || intel_state.is_mem)
 835     {
 836       /* Memory operand.  */
 837       if (i.mem_operands == 1 && !maybe_adjust_templates ())
 838         return 0;
 839       if ((int) i.mem_operands
 840           >= 2 - !current_templates->start->opcode_modifier.isstring)
 841         {
 842           /* Handle
 843
 844              call       0x9090,0x90909090
 845              lcall      0x9090,0x90909090
 846              jmp        0x9090,0x90909090
 847              ljmp       0x9090,0x90909090
 848            */
 849
 850           if ((current_templates->start->opcode_modifier.jumpintersegment
 851                || current_templates->start->opcode_modifier.jumpdword
 852                || current_templates->start->opcode_modifier.jump)
 853               && this_operand == 1
 854               && intel_state.seg == NULL
 855               && i.mem_operands == 1
 856               && i.disp_operands == 1
 857               && intel_state.op_modifier == O_absent)
 858             {
 859               /* Try to process the first operand as immediate,  */
 860               this_operand = 0;
 861               if (i386_finalize_immediate (exp_seg, i.op[0].imms,
 862                                            intel_state.reloc_types,
 863                                            NULL))
 864                 {
 865                   this_operand = 1;
 866                   expP = &im_expressions[0];
 867                   i.op[this_operand].imms = expP;
 868                   *expP = exp;
 869
 870                   /* Try to process the second operand as immediate,  */
 871                   if (i386_finalize_immediate (exp_seg, expP,
 872                                                intel_state.reloc_types,
 873                                                NULL))
 874                     {
 875                       i.mem_operands = 0;
 876                       i.disp_operands = 0;
 877                       i.imm_operands = 2;
 878                       i.types[0].bitfield.mem = 0;
 879                       i.types[0].bitfield.disp16 = 0;
 880                       i.types[0].bitfield.disp32 = 0;
 881                       i.types[0].bitfield.disp32s = 0;
 882                       return 1;
 883                     }
 884                 }
 885             }
 886
 887           as_bad (_("too many memory references for `%s'"),
 888                   current_templates->start->name);
 889           return 0;
 890         }
 891
 892       /* Swap base and index in 16-bit memory operands like
 893          [si+bx]. Since i386_index_check is also used in AT&T
 894          mode we have to do this here.  */
 895       if (intel_state.base
 896           && intel_state.index
 897           && intel_state.base->reg_type.bitfield.word
 898           && intel_state.index->reg_type.bitfield.word
 899           && intel_state.base->reg_num >= 6
 900           && intel_state.index->reg_num < 6)
 901         {
 902           i.base_reg = intel_state.index;
 903           i.index_reg = intel_state.base;
 904         }
 905       else
 906         {
 907           i.base_reg = intel_state.base;
 908           i.index_reg = intel_state.index;
 909         }
 910
 911       if (i.base_reg || i.index_reg)
 912         i.types[this_operand].bitfield.baseindex = 1;
 913
 914       expP = &disp_expressions[i.disp_operands];
 915       memcpy (expP, &exp, sizeof(exp));
 916       resolve_expression (expP);
 917
 918       if (expP->X_op != O_constant
 919           || expP->X_add_number
 920           || !i.types[this_operand].bitfield.baseindex)
 921         {
 922           i.op[this_operand].disps = expP;
 923           i.disp_operands++;
 924
 925           i386_addressing_mode ();
 926
 927           if (flag_code == CODE_64BIT)
 928             {
 929               i.types[this_operand].bitfield.disp32 = 1;
 930               if (!i.prefix[ADDR_PREFIX])
 931                 {
 932                   i.types[this_operand].bitfield.disp64 = 1;
 933                   i.types[this_operand].bitfield.disp32s = 1;
 934                 }
 935             }
 936           else if (!i.prefix[ADDR_PREFIX] ^ (flag_code == CODE_16BIT))
 937             i.types[this_operand].bitfield.disp32 = 1;
 938           else
 939             i.types[this_operand].bitfield.disp16 = 1;
 940
 941 #if defined (OBJ_AOUT) || defined (OBJ_MAYBE_AOUT)
 942           /*
 943            * exp_seg is used only for verification in
 944            * i386_finalize_displacement, and we can end up seeing reg_section
 945            * here - but we know we removed all registers from the expression
 946            * (or error-ed on any remaining ones) in i386_intel_simplify.  I
 947            * consider the check in i386_finalize_displacement bogus anyway, in
 948            * particular because it doesn't allow for expr_section, so I'd
 949            * rather see that check (and the similar one in
 950            * i386_finalize_immediate) use SEG_NORMAL(), but not being an a.out
 951            * expert I can't really say whether that would have other bad side
 952            * effects.
 953            */
 954           if (OUTPUT_FLAVOR == bfd_target_aout_flavour
 955               && exp_seg == reg_section)
 956             exp_seg = expP->X_op != O_constant ? undefined_section
 957                                                : absolute_section;
 958 #endif
 959
 960           if (!i386_finalize_displacement (exp_seg, expP,
 961                                            intel_state.reloc_types,
 962                                            operand_string))
 963             return 0;
 964         }
 965
 966       if (intel_state.seg)
 967         {
 968           for (ret = check_none; ; ret = operand_check)
 969             {
 970               expP = symbol_get_value_expression (intel_state.seg);
 971               if (expP->X_op != O_full_ptr
 972                   || symbol_get_value_expression (expP->X_op_symbol)->X_op
 973                      != O_register)
 974                 break;
 975               intel_state.seg = expP->X_add_symbol;
 976             }
 977           if (expP->X_op != O_register)
 978             {
 979               as_bad (_("segment register name expected"));
 980               return 0;
 981             }
 982           if (!i386_regtab[expP->X_add_number].reg_type.bitfield.sreg2
 983               && !i386_regtab[expP->X_add_number].reg_type.bitfield.sreg3)
 984             {
 985               as_bad (_("invalid use of register"));
 986               return 0;
 987             }
 988           switch (ret)
 989             {
 990             case check_error:
 991               as_bad (_("redundant segment overrides"));
 992               return 0;
 993             case check_warning:
 994               as_warn (_("redundant segment overrides"));
 995               break;
 996             }
 997           switch (i386_regtab[expP->X_add_number].reg_num)
 998             {
 999             case 0: i.seg[i.mem_operands] = &es; break;
1000             case 1: i.seg[i.mem_operands] = &cs; break;
1001             case 2: i.seg[i.mem_operands] = &ss; break;
1002             case 3: i.seg[i.mem_operands] = &ds; break;
1003             case 4: i.seg[i.mem_operands] = &fs; break;
1004             case 5: i.seg[i.mem_operands] = &gs; break;
1005             case RegFlat: i.seg[i.mem_operands] = NULL; break;
1006             }
1007         }
1008
1009       if (!i386_index_check (operand_string))
1010         return 0;
1011
1012       i.types[this_operand].bitfield.mem = 1;
1013       if (i.mem_operands == 0)
1014         i.memop1_string = xstrdup (operand_string);
1015       ++i.mem_operands;
1016     }
1017   else
1018     {
1019       /* Immediate.  */
1020       if (i.imm_operands >= MAX_IMMEDIATE_OPERANDS)
1021         {
1022           as_bad (_("at most %d immediate operands are allowed"),
1023                   MAX_IMMEDIATE_OPERANDS);
1024           return 0;
1025         }
1026
1027       expP = &im_expressions[i.imm_operands++];
1028       i.op[this_operand].imms = expP;
1029       *expP = exp;
1030
1031       return i386_finalize_immediate (exp_seg, expP, intel_state.reloc_types,
1032                                       operand_string);
1033     }
1034
1035   return 1;
1036 }