gas/config/tc-i386-intel.c

   1 /* tc-i386.c -- Assemble Intel syntax code for ix86/x86-64
   2    Copyright (C) 2009-2016 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 multipication 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.regxmm
 290                || i386_regtab[reg_num].reg_type.bitfield.regymm
 291                || i386_regtab[reg_num].reg_type.bitfield.regzmm))
 292     intel_state.index = i386_regtab + reg_num;
 293   else if (!intel_state.base && !intel_state.in_scale)
 294     intel_state.base = i386_regtab + reg_num;
 295   else if (!intel_state.index)
 296     {
 297       if (intel_state.in_scale
 298           || current_templates->start->base_opcode == 0xf30f1b /* bndmk */
 299           || (current_templates->start->base_opcode & ~1) == 0x0f1a /* bnd{ld,st}x */
 300           || i386_regtab[reg_num].reg_type.bitfield.baseindex)
 301         intel_state.index = i386_regtab + reg_num;
 302       else
 303         {
 304           /* Convert base to index and make ESP/RSP the base.  */
 305           intel_state.index = intel_state.base;
 306           intel_state.base = i386_regtab + reg_num;
 307         }
 308     }
 309   else
 310     {
 311       /* esp is invalid as index */
 312       intel_state.index = i386_regtab + REGNAM_EAX + ESP_REG_NUM;
 313     }
 314   return 2;
 315 }
 316
 317 static int i386_intel_simplify (expressionS *);
 318
 319 static INLINE int i386_intel_simplify_symbol(symbolS *sym)
 320 {
 321   int ret = i386_intel_simplify (symbol_get_value_expression (sym));
 322
 323   if (ret == 2)
 324   {
 325     S_SET_SEGMENT(sym, absolute_section);
 326     ret = 1;
 327   }
 328   return ret;
 329 }
 330
 331 static int i386_intel_simplify (expressionS *e)
 332 {
 333   const reg_entry *the_reg = (this_operand >= 0
 334                               ? i.op[this_operand].regs : NULL);
 335   const reg_entry *base = intel_state.base;
 336   const reg_entry *state_index = intel_state.index;
 337   int ret;
 338
 339   if (!intel_syntax)
 340     return 1;
 341
 342   switch (e->X_op)
 343     {
 344     case O_index:
 345       if (e->X_add_symbol)
 346         {
 347           if (!i386_intel_simplify_symbol (e->X_add_symbol)
 348               || !i386_intel_check(the_reg, intel_state.base,
 349                                    intel_state.index))
 350             return 0;
 351         }
 352       if (!intel_state.in_offset)
 353         ++intel_state.in_bracket;
 354       ret = i386_intel_simplify_symbol (e->X_op_symbol);
 355       if (!intel_state.in_offset)
 356         --intel_state.in_bracket;
 357       if (!ret)
 358         return 0;
 359       if (e->X_add_symbol)
 360         e->X_op = O_add;
 361       else
 362         i386_intel_fold (e, e->X_op_symbol);
 363       break;
 364
 365     case O_offset:
 366       intel_state.has_offset = 1;
 367       ++intel_state.in_offset;
 368       ret = i386_intel_simplify_symbol (e->X_add_symbol);
 369       --intel_state.in_offset;
 370       if (!ret || !i386_intel_check(the_reg, base, state_index))
 371         return 0;
 372       i386_intel_fold (e, e->X_add_symbol);
 373       return ret;
 374
 375     case O_byte_ptr:
 376     case O_word_ptr:
 377     case O_dword_ptr:
 378     case O_fword_ptr:
 379     case O_qword_ptr:
 380     case O_tbyte_ptr:
 381     case O_oword_ptr:
 382     case O_xmmword_ptr:
 383     case O_ymmword_ptr:
 384     case O_zmmword_ptr:
 385     case O_near_ptr:
 386     case O_far_ptr:
 387       if (intel_state.op_modifier == O_absent)
 388         intel_state.op_modifier = e->X_op;
 389       /* FALLTHROUGH */
 390     case O_short:
 391       if (symbol_get_value_expression (e->X_add_symbol)->X_op
 392           == O_register)
 393         {
 394           as_bad (_("invalid use of register"));
 395           return 0;
 396         }
 397       if (!i386_intel_simplify_symbol (e->X_add_symbol))
 398         return 0;
 399       i386_intel_fold (e, e->X_add_symbol);
 400       break;
 401
 402     case O_full_ptr:
 403       if (symbol_get_value_expression (e->X_op_symbol)->X_op
 404           == O_register)
 405         {
 406           as_bad (_("invalid use of register"));
 407           return 0;
 408         }
 409       if (!i386_intel_simplify_symbol (e->X_op_symbol)
 410           || !i386_intel_check(the_reg, intel_state.base,
 411                                intel_state.index))
 412         return 0;
 413       if (!intel_state.in_offset)
 414         intel_state.seg = e->X_add_symbol;
 415       i386_intel_fold (e, e->X_op_symbol);
 416       break;
 417
 418     case O_multiply:
 419       if (this_operand >= 0 && intel_state.in_bracket)
 420         {
 421           expressionS *scale = NULL;
 422           int has_index = (intel_state.index != NULL);
 423
 424           if (!intel_state.in_scale++)
 425             intel_state.scale_factor = 1;
 426
 427           ret = i386_intel_simplify_symbol (e->X_add_symbol);
 428           if (ret && !has_index && intel_state.index)
 429             scale = symbol_get_value_expression (e->X_op_symbol);
 430
 431           if (ret)
 432             ret = i386_intel_simplify_symbol (e->X_op_symbol);
 433           if (ret && !scale && !has_index && intel_state.index)
 434             scale = symbol_get_value_expression (e->X_add_symbol);
 435
 436           if (ret && scale)
 437             {
 438               resolve_expression (scale);
 439               if (scale->X_op != O_constant
 440                   || intel_state.index->reg_type.bitfield.reg16)
 441                 scale->X_add_number = 0;
 442               intel_state.scale_factor *= scale->X_add_number;
 443             }
 444
 445           --intel_state.in_scale;
 446           if (!ret)
 447             return 0;
 448
 449           if (!intel_state.in_scale)
 450             switch (intel_state.scale_factor)
 451               {
 452               case 1:
 453                 i.log2_scale_factor = 0;
 454                 break;
 455               case 2:
 456                 i.log2_scale_factor = 1;
 457                 break;
 458               case 4:
 459                 i.log2_scale_factor = 2;
 460                 break;
 461               case 8:
 462                 i.log2_scale_factor = 3;
 463                 break;
 464               default:
 465                 /* esp is invalid as index */
 466                 intel_state.index = i386_regtab + REGNAM_EAX + ESP_REG_NUM;
 467                 break;
 468               }
 469
 470           break;
 471         }
 472       goto fallthrough;
 473
 474     case O_register:
 475       ret = i386_intel_simplify_register (e);
 476       if (ret == 2)
 477         {
 478           gas_assert (e->X_add_number < (unsigned short) -1);
 479           e->X_md = (unsigned short) e->X_add_number + 1;
 480           e->X_op = O_constant;
 481           e->X_add_number = 0;
 482         }
 483       return ret;
 484
 485     case O_constant:
 486       if (e->X_md)
 487         return i386_intel_simplify_register (e);
 488
 489       /* FALLTHROUGH */
 490     default:
 491 fallthrough:
 492       if (e->X_add_symbol
 493           && !i386_intel_simplify_symbol (e->X_add_symbol))
 494         return 0;
 495       if (e->X_op == O_add || e->X_op == O_subtract)
 496         {
 497           base = intel_state.base;
 498           state_index = intel_state.index;
 499         }
 500       if (!i386_intel_check (the_reg, base, state_index)
 501           || (e->X_op_symbol
 502               && !i386_intel_simplify_symbol (e->X_op_symbol))
 503           || !i386_intel_check (the_reg,
 504                                 (e->X_op != O_add
 505                                  ? base : intel_state.base),
 506                                 (e->X_op != O_add
 507                                  ? state_index : intel_state.index)))
 508         return 0;
 509       break;
 510     }
 511
 512   if (this_operand >= 0
 513       && e->X_op == O_symbol
 514       && !intel_state.in_offset)
 515     {
 516       segT seg = S_GET_SEGMENT (e->X_add_symbol);
 517
 518       if (seg != absolute_section
 519           && seg != reg_section
 520           && seg != expr_section)
 521         intel_state.is_mem |= 2 - !intel_state.in_bracket;
 522     }
 523
 524   return 1;
 525 }
 526
 527 int i386_need_index_operator (void)
 528 {
 529   return intel_syntax < 0;
 530 }
 531
 532 static int
 533 i386_intel_operand (char *operand_string, int got_a_float)
 534 {
 535   char *saved_input_line_pointer, *buf;
 536   segT exp_seg;
 537   expressionS exp, *expP;
 538   char suffix = 0;
 539   int ret;
 540
 541   /* Handle vector immediates.  */
 542   if (RC_SAE_immediate (operand_string))
 543     return 1;
 544
 545   /* Initialize state structure.  */
 546   intel_state.op_modifier = O_absent;
 547   intel_state.is_mem = 0;
 548   intel_state.is_indirect = 0;
 549   intel_state.has_offset = 0;
 550   intel_state.base = NULL;
 551   intel_state.index = NULL;
 552   intel_state.seg = NULL;
 553   operand_type_set (&intel_state.reloc_types, ~0);
 554   gas_assert (!intel_state.in_offset);
 555   gas_assert (!intel_state.in_bracket);
 556   gas_assert (!intel_state.in_scale);
 557
 558   saved_input_line_pointer = input_line_pointer;
 559   input_line_pointer = buf = xstrdup (operand_string);
 560
 561   intel_syntax = -1;
 562   memset (&exp, 0, sizeof(exp));
 563   exp_seg = expression (&exp);
 564   ret = i386_intel_simplify (&exp);
 565   intel_syntax = 1;
 566
 567   SKIP_WHITESPACE ();
 568
 569   /* Handle vector operations.  */
 570   if (*input_line_pointer == '{')
 571     {
 572       char *end = check_VecOperations (input_line_pointer, NULL);
 573       if (end)
 574         input_line_pointer = end;
 575       else
 576         ret = 0;
 577     }
 578
 579   if (!is_end_of_line[(unsigned char) *input_line_pointer])
 580     {
 581       as_bad (_("junk `%s' after expression"), input_line_pointer);
 582       ret = 0;
 583     }
 584   else if (exp.X_op == O_illegal || exp.X_op == O_absent)
 585     {
 586       as_bad (_("invalid expression"));
 587       ret = 0;
 588     }
 589   else if (!intel_state.has_offset
 590            && input_line_pointer > buf
 591            && *(input_line_pointer - 1) == ']')
 592     {
 593       intel_state.is_mem |= 1;
 594       intel_state.is_indirect = 1;
 595     }
 596
 597   input_line_pointer = saved_input_line_pointer;
 598   free (buf);
 599
 600   gas_assert (!intel_state.in_offset);
 601   gas_assert (!intel_state.in_bracket);
 602   gas_assert (!intel_state.in_scale);
 603
 604   if (!ret)
 605     return 0;
 606
 607   if (intel_state.op_modifier != O_absent
 608       && current_templates->start->base_opcode != 0x8d /* lea */)
 609     {
 610       i.types[this_operand].bitfield.unspecified = 0;
 611
 612       switch (intel_state.op_modifier)
 613         {
 614         case O_byte_ptr:
 615           i.types[this_operand].bitfield.byte = 1;
 616           suffix = BYTE_MNEM_SUFFIX;
 617           break;
 618
 619         case O_word_ptr:
 620           i.types[this_operand].bitfield.word = 1;
 621           if ((current_templates->start->name[0] == 'l'
 622                && current_templates->start->name[2] == 's'
 623                && current_templates->start->name[3] == 0)
 624               || current_templates->start->base_opcode == 0x62 /* bound */)
 625             suffix = BYTE_MNEM_SUFFIX; /* so it will cause an error */
 626           else if (got_a_float == 2)    /* "fi..." */
 627             suffix = SHORT_MNEM_SUFFIX;
 628           else
 629             suffix = WORD_MNEM_SUFFIX;
 630           break;
 631
 632         case O_dword_ptr:
 633           i.types[this_operand].bitfield.dword = 1;
 634           if ((current_templates->start->name[0] == 'l'
 635                && current_templates->start->name[2] == 's'
 636                && current_templates->start->name[3] == 0)
 637               || current_templates->start->base_opcode == 0x62 /* bound */)
 638             suffix = WORD_MNEM_SUFFIX;
 639           else if (flag_code == CODE_16BIT
 640                    && (current_templates->start->opcode_modifier.jump
 641                        || current_templates->start->opcode_modifier.jumpdword))
 642             suffix = LONG_DOUBLE_MNEM_SUFFIX;
 643           else if (got_a_float == 1)    /* "f..." */
 644             suffix = SHORT_MNEM_SUFFIX;
 645           else
 646             suffix = LONG_MNEM_SUFFIX;
 647           break;
 648
 649         case O_fword_ptr:
 650           i.types[this_operand].bitfield.fword = 1;
 651           if (current_templates->start->name[0] == 'l'
 652               && current_templates->start->name[2] == 's'
 653               && current_templates->start->name[3] == 0)
 654             suffix = LONG_MNEM_SUFFIX;
 655           else if (!got_a_float)
 656             {
 657               if (flag_code == CODE_16BIT)
 658                 add_prefix (DATA_PREFIX_OPCODE);
 659               suffix = LONG_DOUBLE_MNEM_SUFFIX;
 660             }
 661           else
 662             suffix = BYTE_MNEM_SUFFIX; /* so it will cause an error */
 663           break;
 664
 665         case O_qword_ptr:
 666           i.types[this_operand].bitfield.qword = 1;
 667           if (current_templates->start->base_opcode == 0x62 /* bound */
 668               || got_a_float == 1)      /* "f..." */
 669             suffix = LONG_MNEM_SUFFIX;
 670           else
 671             suffix = QWORD_MNEM_SUFFIX;
 672           break;
 673
 674         case O_tbyte_ptr:
 675           i.types[this_operand].bitfield.tbyte = 1;
 676           if (got_a_float == 1)
 677             suffix = LONG_DOUBLE_MNEM_SUFFIX;
 678           else
 679             suffix = BYTE_MNEM_SUFFIX; /* so it will cause an error */
 680           break;
 681
 682         case O_oword_ptr:
 683         case O_xmmword_ptr:
 684           i.types[this_operand].bitfield.xmmword = 1;
 685           suffix = XMMWORD_MNEM_SUFFIX;
 686           break;
 687
 688         case O_ymmword_ptr:
 689           i.types[this_operand].bitfield.ymmword = 1;
 690           suffix = YMMWORD_MNEM_SUFFIX;
 691           break;
 692
 693         case O_zmmword_ptr:
 694           i.types[this_operand].bitfield.zmmword = 1;
 695           suffix = ZMMWORD_MNEM_SUFFIX;
 696           break;
 697
 698         case O_far_ptr:
 699           suffix = LONG_DOUBLE_MNEM_SUFFIX;
 700           /* FALLTHROUGH */
 701         case O_near_ptr:
 702           if (!current_templates->start->opcode_modifier.jump
 703               && !current_templates->start->opcode_modifier.jumpdword)
 704             suffix = got_a_float /* so it will cause an error */
 705                      ? BYTE_MNEM_SUFFIX
 706                      : LONG_DOUBLE_MNEM_SUFFIX;
 707           break;
 708
 709         default:
 710           BAD_CASE (intel_state.op_modifier);
 711           break;
 712         }
 713
 714       if (!i.suffix)
 715         i.suffix = suffix;
 716       else if (i.suffix != suffix)
 717         {
 718           as_bad (_("conflicting operand size modifiers"));
 719           return 0;
 720         }
 721     }
 722
 723   /* Operands for jump/call need special consideration.  */
 724   if (current_templates->start->opcode_modifier.jump
 725       || current_templates->start->opcode_modifier.jumpdword
 726       || current_templates->start->opcode_modifier.jumpintersegment)
 727     {
 728       if (i.op[this_operand].regs
 729           || intel_state.base
 730           || intel_state.index
 731           || intel_state.is_mem > 1)
 732         i.types[this_operand].bitfield.jumpabsolute = 1;
 733       else
 734         switch (intel_state.op_modifier)
 735           {
 736           case O_near_ptr:
 737             if (intel_state.seg)
 738               i.types[this_operand].bitfield.jumpabsolute = 1;
 739             else
 740               intel_state.is_mem = 1;
 741             break;
 742           case O_far_ptr:
 743           case O_absent:
 744             if (!intel_state.seg)
 745               {
 746                 intel_state.is_mem = 1;
 747                 if (intel_state.op_modifier == O_absent)
 748                   {
 749                     if (intel_state.is_indirect == 1)
 750                       i.types[this_operand].bitfield.jumpabsolute = 1;
 751                     break;
 752                   }
 753                 as_bad (_("cannot infer the segment part of the operand"));
 754                 return 0;
 755               }
 756             else if (S_GET_SEGMENT (intel_state.seg) == reg_section)
 757               i.types[this_operand].bitfield.jumpabsolute = 1;
 758             else
 759               {
 760                 i386_operand_type types;
 761
 762                 if (i.imm_operands >= MAX_IMMEDIATE_OPERANDS)
 763                   {
 764                     as_bad (_("at most %d immediate operands are allowed"),
 765                             MAX_IMMEDIATE_OPERANDS);
 766                     return 0;
 767                   }
 768                 expP = &im_expressions[i.imm_operands++];
 769                 memset (expP, 0, sizeof(*expP));
 770                 expP->X_op = O_symbol;
 771                 expP->X_add_symbol = intel_state.seg;
 772                 i.op[this_operand].imms = expP;
 773
 774                 resolve_expression (expP);
 775                 operand_type_set (&types, ~0);
 776                 if (!i386_finalize_immediate (S_GET_SEGMENT (intel_state.seg),
 777                                               expP, types, operand_string))
 778                   return 0;
 779                 if (i.operands < MAX_OPERANDS)
 780                   {
 781                     this_operand = i.operands++;
 782                     i.types[this_operand].bitfield.unspecified = 1;
 783                   }
 784                 if (suffix == LONG_DOUBLE_MNEM_SUFFIX)
 785                   i.suffix = 0;
 786                 intel_state.seg = NULL;
 787                 intel_state.is_mem = 0;
 788               }
 789             break;
 790           default:
 791             i.types[this_operand].bitfield.jumpabsolute = 1;
 792             break;
 793           }
 794       if (i.types[this_operand].bitfield.jumpabsolute)
 795         intel_state.is_mem |= 1;
 796     }
 797   else if (intel_state.seg)
 798     intel_state.is_mem |= 1;
 799
 800   if (i.op[this_operand].regs)
 801     {
 802       i386_operand_type temp;
 803
 804       /* Register operand.  */
 805       if (intel_state.base || intel_state.index || intel_state.seg)
 806         {
 807           as_bad (_("invalid operand"));
 808           return 0;
 809         }
 810
 811       temp = i.op[this_operand].regs->reg_type;
 812       temp.bitfield.baseindex = 0;
 813       i.types[this_operand] = operand_type_or (i.types[this_operand],
 814                                                temp);
 815       i.types[this_operand].bitfield.unspecified = 0;
 816       ++i.reg_operands;
 817     }
 818   else if (intel_state.base
 819            || intel_state.index
 820            || intel_state.seg
 821            || intel_state.is_mem)
 822     {
 823       /* Memory operand.  */
 824       if ((int) i.mem_operands
 825           >= 2 - !current_templates->start->opcode_modifier.isstring)
 826         {
 827           /* Handle
 828
 829              call       0x9090,0x90909090
 830              lcall      0x9090,0x90909090
 831              jmp        0x9090,0x90909090
 832              ljmp       0x9090,0x90909090
 833            */
 834
 835           if ((current_templates->start->opcode_modifier.jumpintersegment
 836                || current_templates->start->opcode_modifier.jumpdword
 837                || current_templates->start->opcode_modifier.jump)
 838               && this_operand == 1
 839               && intel_state.seg == NULL
 840               && i.mem_operands == 1
 841               && i.disp_operands == 1
 842               && intel_state.op_modifier == O_absent)
 843             {
 844               /* Try to process the first operand as immediate,  */
 845               this_operand = 0;
 846               if (i386_finalize_immediate (exp_seg, i.op[0].imms,
 847                                            intel_state.reloc_types,
 848                                            NULL))
 849                 {
 850                   this_operand = 1;
 851                   expP = &im_expressions[0];
 852                   i.op[this_operand].imms = expP;
 853                   *expP = exp;
 854
 855                   /* Try to process the second operand as immediate,  */
 856                   if (i386_finalize_immediate (exp_seg, expP,
 857                                                intel_state.reloc_types,
 858                                                NULL))
 859                     {
 860                       i.mem_operands = 0;
 861                       i.disp_operands = 0;
 862                       i.imm_operands = 2;
 863                       i.types[0].bitfield.mem = 0;
 864                       i.types[0].bitfield.disp16 = 0;
 865                       i.types[0].bitfield.disp32 = 0;
 866                       i.types[0].bitfield.disp32s = 0;
 867                       return 1;
 868                     }
 869                 }
 870             }
 871
 872           as_bad (_("too many memory references for `%s'"),
 873                   current_templates->start->name);
 874           return 0;
 875         }
 876
 877       expP = &disp_expressions[i.disp_operands];
 878       memcpy (expP, &exp, sizeof(exp));
 879       resolve_expression (expP);
 880
 881       if (expP->X_op != O_constant
 882           || expP->X_add_number
 883           || (!intel_state.base
 884               && !intel_state.index))
 885         {
 886           i.op[this_operand].disps = expP;
 887           i.disp_operands++;
 888
 889           if (flag_code == CODE_64BIT)
 890             {
 891               i.types[this_operand].bitfield.disp32 = 1;
 892               if (!i.prefix[ADDR_PREFIX])
 893                 {
 894                   i.types[this_operand].bitfield.disp64 = 1;
 895                   i.types[this_operand].bitfield.disp32s = 1;
 896                 }
 897             }
 898           else if (!i.prefix[ADDR_PREFIX] ^ (flag_code == CODE_16BIT))
 899             i.types[this_operand].bitfield.disp32 = 1;
 900           else
 901             i.types[this_operand].bitfield.disp16 = 1;
 902
 903 #if defined (OBJ_AOUT) || defined (OBJ_MAYBE_AOUT)
 904           /*
 905            * exp_seg is used only for verification in
 906            * i386_finalize_displacement, and we can end up seeing reg_section
 907            * here - but we know we removed all registers from the expression
 908            * (or error-ed on any remaining ones) in i386_intel_simplify.  I
 909            * consider the check in i386_finalize_displacement bogus anyway, in
 910            * particular because it doesn't allow for expr_section, so I'd
 911            * rather see that check (and the similar one in
 912            * i386_finalize_immediate) use SEG_NORMAL(), but not being an a.out
 913            * expert I can't really say whether that would have other bad side
 914            * effects.
 915            */
 916           if (OUTPUT_FLAVOR == bfd_target_aout_flavour
 917               && exp_seg == reg_section)
 918             exp_seg = expP->X_op != O_constant ? undefined_section
 919                                                : absolute_section;
 920 #endif
 921
 922           if (!i386_finalize_displacement (exp_seg, expP,
 923                                            intel_state.reloc_types,
 924                                            operand_string))
 925             return 0;
 926         }
 927
 928       if (intel_state.base || intel_state.index)
 929         i.types[this_operand].bitfield.baseindex = 1;
 930
 931       if (intel_state.seg)
 932         {
 933           for (;;)
 934             {
 935               expP = symbol_get_value_expression (intel_state.seg);
 936               if (expP->X_op != O_full_ptr)
 937                 break;
 938               intel_state.seg = expP->X_add_symbol;
 939             }
 940           if (expP->X_op != O_register)
 941             {
 942               as_bad (_("segment register name expected"));
 943               return 0;
 944             }
 945           if (!i386_regtab[expP->X_add_number].reg_type.bitfield.sreg2
 946               && !i386_regtab[expP->X_add_number].reg_type.bitfield.sreg3)
 947             {
 948               as_bad (_("invalid use of register"));
 949               return 0;
 950             }
 951           switch (i386_regtab[expP->X_add_number].reg_num)
 952             {
 953             case 0: i.seg[i.mem_operands] = &es; break;
 954             case 1: i.seg[i.mem_operands] = &cs; break;
 955             case 2: i.seg[i.mem_operands] = &ss; break;
 956             case 3: i.seg[i.mem_operands] = &ds; break;
 957             case 4: i.seg[i.mem_operands] = &fs; break;
 958             case 5: i.seg[i.mem_operands] = &gs; break;
 959             case RegFlat: i.seg[i.mem_operands] = NULL; break;
 960             }
 961         }
 962
 963       /* Swap base and index in 16-bit memory operands like
 964          [si+bx]. Since i386_index_check is also used in AT&T
 965          mode we have to do that here.  */
 966       if (intel_state.base
 967           && intel_state.index
 968           && intel_state.base->reg_type.bitfield.reg16
 969           && intel_state.index->reg_type.bitfield.reg16
 970           && intel_state.base->reg_num >= 6
 971           && intel_state.index->reg_num < 6)
 972         {
 973           i.base_reg = intel_state.index;
 974           i.index_reg = intel_state.base;
 975         }
 976       else
 977         {
 978           i.base_reg = intel_state.base;
 979           i.index_reg = intel_state.index;
 980         }
 981
 982       if (!i386_index_check (operand_string))
 983         return 0;
 984
 985       i.types[this_operand].bitfield.mem = 1;
 986       ++i.mem_operands;
 987     }
 988   else
 989     {
 990       /* Immediate.  */
 991       if (i.imm_operands >= MAX_IMMEDIATE_OPERANDS)
 992         {
 993           as_bad (_("at most %d immediate operands are allowed"),
 994                   MAX_IMMEDIATE_OPERANDS);
 995           return 0;
 996         }
 997
 998       expP = &im_expressions[i.imm_operands++];
 999       i.op[this_operand].imms = expP;
1000       *expP = exp;
1001
1002       return i386_finalize_immediate (exp_seg, expP, intel_state.reloc_types,
1003                                       operand_string);
1004     }
1005
1006   return 1;
1007 }