gas/config/tc-i386-intel.c

   1 /* tc-i386.c -- Assemble Intel syntax code for ix86/x86-64
   2    Copyright 2009, 2010
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS 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 3, or (at your option)
  10    any later version.
  11
  12    GAS 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 GAS; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  20    02110-1301, USA.  */
  21
  22 static struct
  23   {
  24     operatorT op_modifier;      /* Operand modifier.  */
  25     int is_mem;                 /* 1 if operand is memory reference.  */
  26     int is_indirect;            /* 1 if operand is indirect reference.  */
  27     int has_offset;             /* 1 if operand has offset.  */
  28     unsigned int in_offset;     /* >=1 if processing operand of offset.  */
  29     unsigned int in_bracket;    /* >=1 if processing operand in brackets.  */
  30     unsigned int in_scale;      /* >=1 if processing multipication operand
  31                                  * in brackets.  */
  32     i386_operand_type reloc_types;      /* Value obtained from lex_got().  */
  33     const reg_entry *base;      /* Base register (if any).  */
  34     const reg_entry *index;     /* Index register (if any).  */
  35     offsetT scale_factor;       /* Accumulated scale factor.  */
  36     symbolS *seg;
  37   }
  38 intel_state;
  39
  40 /* offset X_add_symbol */
  41 #define O_offset O_md32
  42 /* offset X_add_symbol */
  43 #define O_short O_md31
  44 /* near ptr X_add_symbol */
  45 #define O_near_ptr O_md30
  46 /* far ptr X_add_symbol */
  47 #define O_far_ptr O_md29
  48 /* byte ptr X_add_symbol */
  49 #define O_byte_ptr O_md28
  50 /* word ptr X_add_symbol */
  51 #define O_word_ptr O_md27
  52 /* dword ptr X_add_symbol */
  53 #define O_dword_ptr O_md26
  54 /* qword ptr X_add_symbol */
  55 #define O_qword_ptr O_md25
  56 /* oword ptr X_add_symbol */
  57 #define O_oword_ptr O_md24
  58 /* fword ptr X_add_symbol */
  59 #define O_fword_ptr O_md23
  60 /* tbyte ptr X_add_symbol */
  61 #define O_tbyte_ptr O_md22
  62 /* xmmword ptr X_add_symbol */
  63 #define O_xmmword_ptr O_md21
  64 /* ymmword ptr X_add_symbol */
  65 #define O_ymmword_ptr O_md20
  66
  67 static struct
  68   {
  69     const char *name;
  70     operatorT op;
  71     unsigned int operands;
  72   }
  73 const i386_operators[] =
  74   {
  75     { "and", O_bit_and, 2 },
  76     { "eq", O_eq, 2 },
  77     { "ge", O_ge, 2 },
  78     { "gt", O_gt, 2 },
  79     { "le", O_le, 2 },
  80     { "lt", O_lt, 2 },
  81     { "mod", O_modulus, 2 },
  82     { "ne", O_ne, 2 },
  83     { "not", O_bit_not, 1 },
  84     { "offset", O_offset, 1 },
  85     { "or", O_bit_inclusive_or, 2 },
  86     { "shl", O_left_shift, 2 },
  87     { "short", O_short, 1 },
  88     { "shr", O_right_shift, 2 },
  89     { "xor", O_bit_exclusive_or, 2 },
  90     { NULL, O_illegal, 0 }
  91   };
  92
  93 static struct
  94   {
  95     const char *name;
  96     operatorT op;
  97     unsigned short sz[3];
  98   }
  99 const i386_types[] =
 100   {
 101 #define I386_TYPE(t, n) { #t, O_##t##_ptr, { n, n, n } }
 102     I386_TYPE(byte, 1),
 103     I386_TYPE(word, 2),
 104     I386_TYPE(dword, 4),
 105     I386_TYPE(fword, 6),
 106     I386_TYPE(qword, 8),
 107     I386_TYPE(tbyte, 10),
 108     I386_TYPE(oword, 16),
 109     I386_TYPE(xmmword, 16),
 110     I386_TYPE(ymmword, 32),
 111 #undef I386_TYPE
 112     { "near", O_near_ptr, { 0xff04, 0xff02, 0xff08 } },
 113     { "far", O_far_ptr, { 0xff06, 0xff05, 0xff06 } },
 114     { NULL, O_illegal, { 0, 0, 0 } }
 115   };
 116
 117 operatorT i386_operator (const char *name, unsigned int operands, char *pc)
 118 {
 119   unsigned int j;
 120
 121   if (!intel_syntax)
 122     return O_absent;
 123
 124   if (!name)
 125     {
 126       if (operands != 2)
 127         return O_illegal;
 128       switch (*input_line_pointer)
 129         {
 130         case ':':
 131           ++input_line_pointer;
 132           return O_full_ptr;
 133         case '[':
 134           ++input_line_pointer;
 135           return O_index;
 136         case '@':
 137           if (this_operand >= 0 && i.reloc[this_operand] == NO_RELOC)
 138             {
 139               int adjust = 0;
 140               char *gotfree_input_line = lex_got (&i.reloc[this_operand],
 141                                                   &adjust,
 142                                                   &intel_state.reloc_types);
 143
 144               if (!gotfree_input_line)
 145                 break;
 146               free (gotfree_input_line);
 147               *input_line_pointer++ = '+';
 148               memset (input_line_pointer, '0', adjust - 1);
 149               input_line_pointer[adjust - 1] = ' ';
 150               return O_add;
 151             }
 152           break;
 153         }
 154       return O_illegal;
 155     }
 156
 157   for (j = 0; i386_operators[j].name; ++j)
 158     if (strcasecmp (i386_operators[j].name, name) == 0)
 159       {
 160         if (i386_operators[j].operands
 161             && i386_operators[j].operands != operands)
 162           return O_illegal;
 163         return i386_operators[j].op;
 164       }
 165
 166   for (j = 0; i386_types[j].name; ++j)
 167     if (strcasecmp (i386_types[j].name, name) == 0)
 168       break;
 169   if (i386_types[j].name && *pc == ' ')
 170     {
 171       char *pname = ++input_line_pointer;
 172       char c = get_symbol_end ();
 173
 174       if (strcasecmp (pname, "ptr") == 0)
 175         {
 176           pname[-1] = *pc;
 177           *pc = c;
 178           if (intel_syntax > 0 || operands != 1)
 179             return O_illegal;
 180           return i386_types[j].op;
 181         }
 182
 183       *input_line_pointer = c;
 184       input_line_pointer = pname - 1;
 185     }
 186
 187   return O_absent;
 188 }
 189
 190 static int i386_intel_parse_name (const char *name, expressionS *e)
 191 {
 192   unsigned int j;
 193
 194   if (! strcmp (name, "$"))
 195     {
 196       current_location (e);
 197       return 1;
 198     }
 199
 200   for (j = 0; i386_types[j].name; ++j)
 201     if (strcasecmp(i386_types[j].name, name) == 0)
 202       {
 203         e->X_op = O_constant;
 204         e->X_add_number = i386_types[j].sz[flag_code];
 205         e->X_add_symbol = NULL;
 206         e->X_op_symbol = NULL;
 207         return 1;
 208       }
 209
 210   return 0;
 211 }
 212
 213 static INLINE int i386_intel_check (const reg_entry *rreg,
 214                                     const reg_entry *base,
 215                                     const reg_entry *iindex)
 216 {
 217   if ((this_operand >= 0
 218        && rreg != i.op[this_operand].regs)
 219       || base != intel_state.base
 220       || iindex != intel_state.index)
 221     {
 222       as_bad (_("invalid use of register"));
 223       return 0;
 224     }
 225   return 1;
 226 }
 227
 228 static INLINE void i386_intel_fold (expressionS *e, symbolS *sym)
 229 {
 230   expressionS *exp = symbol_get_value_expression (sym);
 231   if (S_GET_SEGMENT (sym) == absolute_section)
 232     {
 233       offsetT val = e->X_add_number;
 234
 235       *e = *exp;
 236       e->X_add_number += val;
 237     }
 238   else
 239     {
 240       if (exp->X_op == O_symbol
 241           && strcmp (S_GET_NAME (exp->X_add_symbol),
 242                      GLOBAL_OFFSET_TABLE_NAME) == 0)
 243         sym = exp->X_add_symbol;
 244       e->X_add_symbol = sym;
 245       e->X_op_symbol = NULL;
 246       e->X_op = O_symbol;
 247     }
 248 }
 249
 250 static int
 251 i386_intel_simplify_register (expressionS *e)
 252 {
 253   int reg_num;
 254
 255   if (this_operand < 0 || intel_state.in_offset)
 256     {
 257       as_bad (_("invalid use of register"));
 258       return 0;
 259     }
 260
 261   if (e->X_op == O_register)
 262     reg_num = e->X_add_number;
 263   else
 264     reg_num = e->X_md - 1;
 265
 266   if (!intel_state.in_bracket)
 267     {
 268       if (i.op[this_operand].regs)
 269         {
 270           as_bad (_("invalid use of register"));
 271           return 0;
 272         }
 273       if (i386_regtab[reg_num].reg_type.bitfield.sreg3
 274           && i386_regtab[reg_num].reg_num == RegFlat)
 275         {
 276           as_bad (_("invalid use of pseudo-register"));
 277           return 0;
 278         }
 279       i.op[this_operand].regs = i386_regtab + reg_num;
 280     }
 281   else if (!intel_state.base && !intel_state.in_scale)
 282     intel_state.base = i386_regtab + reg_num;
 283   else if (!intel_state.index)
 284     intel_state.index = i386_regtab + reg_num;
 285   else
 286     {
 287       /* esp is invalid as index */
 288       intel_state.index = i386_regtab + REGNAM_EAX + 4;
 289     }
 290   return 2;
 291 }
 292
 293 static int i386_intel_simplify (expressionS *);
 294
 295 static INLINE int i386_intel_simplify_symbol(symbolS *sym)
 296 {
 297   int ret = i386_intel_simplify (symbol_get_value_expression (sym));
 298
 299   if (ret == 2)
 300   {
 301     S_SET_SEGMENT(sym, absolute_section);
 302     ret = 1;
 303   }
 304   return ret;
 305 }
 306
 307 static int i386_intel_simplify (expressionS *e)
 308 {
 309   const reg_entry *the_reg = (this_operand >= 0
 310                               ? i.op[this_operand].regs : NULL);
 311   const reg_entry *base = intel_state.base;
 312   const reg_entry *state_index = intel_state.index;
 313   int ret;
 314
 315   if (!intel_syntax)
 316     return 1;
 317
 318   switch (e->X_op)
 319     {
 320     case O_index:
 321       if (e->X_add_symbol)
 322         {
 323           if (!i386_intel_simplify_symbol (e->X_add_symbol)
 324               || !i386_intel_check(the_reg, intel_state.base,
 325                                    intel_state.index))
 326             return 0;;
 327         }
 328       if (!intel_state.in_offset)
 329         ++intel_state.in_bracket;
 330       ret = i386_intel_simplify_symbol (e->X_op_symbol);
 331       if (!intel_state.in_offset)
 332         --intel_state.in_bracket;
 333       if (!ret)
 334         return 0;
 335       if (e->X_add_symbol)
 336         e->X_op = O_add;
 337       else
 338         i386_intel_fold (e, e->X_op_symbol);
 339       break;
 340
 341     case O_offset:
 342       intel_state.has_offset = 1;
 343       ++intel_state.in_offset;
 344       ret = i386_intel_simplify_symbol (e->X_add_symbol);
 345       --intel_state.in_offset;
 346       if (!ret || !i386_intel_check(the_reg, base, state_index))
 347         return 0;
 348       i386_intel_fold (e, e->X_add_symbol);
 349       return ret;
 350
 351     case O_byte_ptr:
 352     case O_word_ptr:
 353     case O_dword_ptr:
 354     case O_fword_ptr:
 355     case O_qword_ptr:
 356     case O_tbyte_ptr:
 357     case O_oword_ptr:
 358     case O_xmmword_ptr:
 359     case O_ymmword_ptr:
 360     case O_near_ptr:
 361     case O_far_ptr:
 362       if (intel_state.op_modifier == O_absent)
 363         intel_state.op_modifier = e->X_op;
 364       /* FALLTHROUGH */
 365     case O_short:
 366       if (symbol_get_value_expression (e->X_add_symbol)->X_op
 367           == O_register)
 368         {
 369           as_bad (_("invalid use of register"));
 370           return 0;
 371         }
 372       if (!i386_intel_simplify_symbol (e->X_add_symbol))
 373         return 0;
 374       i386_intel_fold (e, e->X_add_symbol);
 375       break;
 376
 377     case O_full_ptr:
 378       if (symbol_get_value_expression (e->X_op_symbol)->X_op
 379           == O_register)
 380         {
 381           as_bad (_("invalid use of register"));
 382           return 0;
 383         }
 384       if (!i386_intel_simplify_symbol (e->X_op_symbol)
 385           || !i386_intel_check(the_reg, intel_state.base,
 386                                intel_state.index))
 387         return 0;
 388       if (!intel_state.in_offset)
 389         intel_state.seg = e->X_add_symbol;
 390       i386_intel_fold (e, e->X_op_symbol);
 391       break;
 392
 393     case O_multiply:
 394       if (this_operand >= 0 && intel_state.in_bracket)
 395         {
 396           expressionS *scale = NULL;
 397
 398           if (intel_state.index)
 399             --scale;
 400
 401           if (!intel_state.in_scale++)
 402             intel_state.scale_factor = 1;
 403
 404           ret = i386_intel_simplify_symbol (e->X_add_symbol);
 405           if (ret && !scale && intel_state.index)
 406             scale = symbol_get_value_expression (e->X_op_symbol);
 407
 408           if (ret)
 409             ret = i386_intel_simplify_symbol (e->X_op_symbol);
 410           if (ret && !scale && intel_state.index)
 411             scale = symbol_get_value_expression (e->X_add_symbol);
 412
 413           if (ret && scale && (scale + 1))
 414             {
 415               resolve_expression (scale);
 416               if (scale->X_op != O_constant
 417                   || intel_state.index->reg_type.bitfield.reg16)
 418                 scale->X_add_number = 0;
 419               intel_state.scale_factor *= scale->X_add_number;
 420             }
 421
 422           --intel_state.in_scale;
 423           if (!ret)
 424             return 0;
 425
 426           if (!intel_state.in_scale)
 427             switch (intel_state.scale_factor)
 428               {
 429               case 1:
 430                 i.log2_scale_factor = 0;
 431                 break;
 432               case 2:
 433                 i.log2_scale_factor = 1;
 434                 break;
 435               case 4:
 436                 i.log2_scale_factor = 2;
 437                 break;
 438               case 8:
 439                 i.log2_scale_factor = 3;
 440                 break;
 441               default:
 442                 /* esp is invalid as index */
 443                 intel_state.index = i386_regtab + REGNAM_EAX + 4;
 444                 break;
 445               }
 446
 447           break;
 448         }
 449       goto fallthrough;
 450
 451     case O_register:
 452       ret = i386_intel_simplify_register (e);
 453       if (ret == 2)
 454         {
 455           gas_assert (e->X_add_number < (unsigned short) -1);
 456           e->X_md = (unsigned short) e->X_add_number + 1;
 457           e->X_op = O_constant;
 458           e->X_add_number = 0;
 459         }
 460       return ret;
 461
 462     case O_constant:
 463       if (e->X_md)
 464         return i386_intel_simplify_register (e);
 465
 466       /* FALLTHROUGH */
 467     default:
 468 fallthrough:
 469       if (e->X_add_symbol
 470           && !i386_intel_simplify_symbol (e->X_add_symbol))
 471         return 0;
 472       if (e->X_op == O_add || e->X_op == O_subtract)
 473         {
 474           base = intel_state.base;
 475           state_index = intel_state.index;
 476         }
 477       if (!i386_intel_check (the_reg, base, state_index)
 478           || (e->X_op_symbol
 479               && !i386_intel_simplify_symbol (e->X_op_symbol))
 480           || !i386_intel_check (the_reg,
 481                                 (e->X_op != O_add
 482                                  ? base : intel_state.base),
 483                                 (e->X_op != O_add
 484                                  ? state_index : intel_state.index)))
 485         return 0;
 486       break;
 487     }
 488
 489   if (this_operand >= 0
 490       && e->X_op == O_symbol
 491       && !intel_state.in_offset)
 492     {
 493       segT seg = S_GET_SEGMENT (e->X_add_symbol);
 494
 495       if (seg != absolute_section
 496           && seg != reg_section
 497           && seg != expr_section)
 498         intel_state.is_mem |= 2 - !intel_state.in_bracket;
 499     }
 500
 501   return 1;
 502 }
 503
 504 int i386_need_index_operator (void)
 505 {
 506   return intel_syntax < 0;
 507 }
 508
 509 static int
 510 i386_intel_operand (char *operand_string, int got_a_float)
 511 {
 512   char *saved_input_line_pointer, *buf;
 513   segT exp_seg;
 514   expressionS exp, *expP;
 515   char suffix = 0;
 516   int ret;
 517
 518   /* Initialize state structure.  */
 519   intel_state.op_modifier = O_absent;
 520   intel_state.is_mem = 0;
 521   intel_state.is_indirect = 0;
 522   intel_state.has_offset = 0;
 523   intel_state.base = NULL;
 524   intel_state.index = NULL;
 525   intel_state.seg = NULL;
 526   operand_type_set (&intel_state.reloc_types, ~0);
 527   gas_assert (!intel_state.in_offset);
 528   gas_assert (!intel_state.in_bracket);
 529   gas_assert (!intel_state.in_scale);
 530
 531   saved_input_line_pointer = input_line_pointer;
 532   input_line_pointer = buf = xstrdup (operand_string);
 533
 534   intel_syntax = -1;
 535   memset (&exp, 0, sizeof(exp));
 536   exp_seg = expression (&exp);
 537   ret = i386_intel_simplify (&exp);
 538   intel_syntax = 1;
 539
 540   SKIP_WHITESPACE ();
 541   if (!is_end_of_line[(unsigned char) *input_line_pointer])
 542     {
 543       as_bad (_("junk `%s' after expression"), input_line_pointer);
 544       ret = 0;
 545     }
 546   else if (exp.X_op == O_illegal || exp.X_op == O_absent)
 547     {
 548       as_bad (_("invalid expression"));
 549       ret = 0;
 550     }
 551   else if (!intel_state.has_offset
 552            && input_line_pointer > buf
 553            && *(input_line_pointer - 1) == ']')
 554     {
 555       intel_state.is_mem |= 1;
 556       intel_state.is_indirect = 1;
 557     }
 558
 559   input_line_pointer = saved_input_line_pointer;
 560   free (buf);
 561
 562   gas_assert (!intel_state.in_offset);
 563   gas_assert (!intel_state.in_bracket);
 564   gas_assert (!intel_state.in_scale);
 565
 566   if (!ret)
 567     return 0;
 568
 569   if (intel_state.op_modifier != O_absent
 570       && current_templates->start->base_opcode != 0x8d /* lea */)
 571     {
 572       i.types[this_operand].bitfield.unspecified = 0;
 573
 574       switch (intel_state.op_modifier)
 575         {
 576         case O_byte_ptr:
 577           i.types[this_operand].bitfield.byte = 1;
 578           suffix = BYTE_MNEM_SUFFIX;
 579           break;
 580
 581         case O_word_ptr:
 582           i.types[this_operand].bitfield.word = 1;
 583           if ((current_templates->start->name[0] == 'l'
 584                && current_templates->start->name[2] == 's'
 585                && current_templates->start->name[3] == 0)
 586               || current_templates->start->base_opcode == 0x62 /* bound */)
 587             suffix = BYTE_MNEM_SUFFIX; /* so it will cause an error */
 588           else if (got_a_float == 2)    /* "fi..." */
 589             suffix = SHORT_MNEM_SUFFIX;
 590           else
 591             suffix = WORD_MNEM_SUFFIX;
 592           break;
 593
 594         case O_dword_ptr:
 595           i.types[this_operand].bitfield.dword = 1;
 596           if ((current_templates->start->name[0] == 'l'
 597                && current_templates->start->name[2] == 's'
 598                && current_templates->start->name[3] == 0)
 599               || current_templates->start->base_opcode == 0x62 /* bound */)
 600             suffix = WORD_MNEM_SUFFIX;
 601           else if (flag_code == CODE_16BIT
 602                    && (current_templates->start->opcode_modifier.jump
 603                        || current_templates->start->opcode_modifier.jumpdword))
 604             suffix = LONG_DOUBLE_MNEM_SUFFIX;
 605           else if (got_a_float == 1)    /* "f..." */
 606             suffix = SHORT_MNEM_SUFFIX;
 607           else
 608             suffix = LONG_MNEM_SUFFIX;
 609           break;
 610
 611         case O_fword_ptr:
 612           i.types[this_operand].bitfield.fword = 1;
 613           if (current_templates->start->name[0] == 'l'
 614               && current_templates->start->name[2] == 's'
 615               && current_templates->start->name[3] == 0)
 616             suffix = LONG_MNEM_SUFFIX;
 617           else if (!got_a_float)
 618             {
 619               if (flag_code == CODE_16BIT)
 620                 add_prefix (DATA_PREFIX_OPCODE);
 621               suffix = LONG_DOUBLE_MNEM_SUFFIX;
 622             }
 623           else
 624             suffix = BYTE_MNEM_SUFFIX; /* so it will cause an error */
 625           break;
 626
 627         case O_qword_ptr:
 628           i.types[this_operand].bitfield.qword = 1;
 629           if (current_templates->start->base_opcode == 0x62 /* bound */
 630               || got_a_float == 1)      /* "f..." */
 631             suffix = LONG_MNEM_SUFFIX;
 632           else
 633             suffix = QWORD_MNEM_SUFFIX;
 634           break;
 635
 636         case O_tbyte_ptr:
 637           i.types[this_operand].bitfield.tbyte = 1;
 638           if (got_a_float == 1)
 639             suffix = LONG_DOUBLE_MNEM_SUFFIX;
 640           else
 641             suffix = BYTE_MNEM_SUFFIX; /* so it will cause an error */
 642           break;
 643
 644         case O_oword_ptr:
 645         case O_xmmword_ptr:
 646           i.types[this_operand].bitfield.xmmword = 1;
 647           suffix = XMMWORD_MNEM_SUFFIX;
 648           break;
 649
 650         case O_ymmword_ptr:
 651           i.types[this_operand].bitfield.ymmword = 1;
 652           suffix = YMMWORD_MNEM_SUFFIX;
 653           break;
 654
 655         case O_far_ptr:
 656           suffix = LONG_DOUBLE_MNEM_SUFFIX;
 657           /* FALLTHROUGH */
 658         case O_near_ptr:
 659           if (!current_templates->start->opcode_modifier.jump
 660               && !current_templates->start->opcode_modifier.jumpdword)
 661             suffix = got_a_float /* so it will cause an error */
 662                      ? BYTE_MNEM_SUFFIX
 663                      : LONG_DOUBLE_MNEM_SUFFIX;
 664           break;
 665
 666         default:
 667           BAD_CASE (intel_state.op_modifier);
 668           break;
 669         }
 670
 671       if (!i.suffix)
 672         i.suffix = suffix;
 673       else if (i.suffix != suffix)
 674         {
 675           as_bad (_("conflicting operand size modifiers"));
 676           return 0;
 677         }
 678     }
 679
 680   /* Operands for jump/call need special consideration.  */
 681   if (current_templates->start->opcode_modifier.jump
 682       || current_templates->start->opcode_modifier.jumpdword
 683       || current_templates->start->opcode_modifier.jumpintersegment)
 684     {
 685       if (i.op[this_operand].regs
 686           || intel_state.base
 687           || intel_state.index
 688           || intel_state.is_mem > 1)
 689         i.types[this_operand].bitfield.jumpabsolute = 1;
 690       else
 691         switch (intel_state.op_modifier)
 692           {
 693           case O_near_ptr:
 694             if (intel_state.seg)
 695               i.types[this_operand].bitfield.jumpabsolute = 1;
 696             else
 697               intel_state.is_mem = 1;
 698             break;
 699           case O_far_ptr:
 700           case O_absent:
 701             if (!intel_state.seg)
 702               {
 703                 intel_state.is_mem = 1;
 704                 if (intel_state.op_modifier == O_absent)
 705                   {
 706                     if (intel_state.is_indirect == 1)
 707                       i.types[this_operand].bitfield.jumpabsolute = 1;
 708                     break;
 709                   }
 710                 as_bad (_("cannot infer the segment part of the operand"));
 711                 return 0;
 712               }
 713             else if (S_GET_SEGMENT (intel_state.seg) == reg_section)
 714               i.types[this_operand].bitfield.jumpabsolute = 1;
 715             else
 716               {
 717                 i386_operand_type types;
 718
 719                 if (i.imm_operands >= MAX_IMMEDIATE_OPERANDS)
 720                   {
 721                     as_bad (_("at most %d immediate operands are allowed"),
 722                             MAX_IMMEDIATE_OPERANDS);
 723                     return 0;
 724                   }
 725                 expP = &im_expressions[i.imm_operands++];
 726                 memset (expP, 0, sizeof(*expP));
 727                 expP->X_op = O_symbol;
 728                 expP->X_add_symbol = intel_state.seg;
 729                 i.op[this_operand].imms = expP;
 730
 731                 resolve_expression (expP);
 732                 operand_type_set (&types, ~0);
 733                 if (!i386_finalize_immediate (S_GET_SEGMENT (intel_state.seg),
 734                                               expP, types, operand_string))
 735                   return 0;
 736                 if (i.operands < MAX_OPERANDS)
 737                   {
 738                     this_operand = i.operands++;
 739                     i.types[this_operand].bitfield.unspecified = 1;
 740                   }
 741                 if (suffix == LONG_DOUBLE_MNEM_SUFFIX)
 742                   i.suffix = 0;
 743                 intel_state.seg = NULL;
 744                 intel_state.is_mem = 0;
 745               }
 746             break;
 747           default:
 748             i.types[this_operand].bitfield.jumpabsolute = 1;
 749             break;
 750           }
 751       if (i.types[this_operand].bitfield.jumpabsolute)
 752         intel_state.is_mem |= 1;
 753     }
 754   else if (intel_state.seg)
 755     intel_state.is_mem |= 1;
 756
 757   if (i.op[this_operand].regs)
 758     {
 759       i386_operand_type temp;
 760
 761       /* Register operand.  */
 762       if (intel_state.base || intel_state.index || intel_state.seg)
 763         {
 764           as_bad (_("invalid operand"));
 765           return 0;
 766         }
 767
 768       temp = i.op[this_operand].regs->reg_type;
 769       temp.bitfield.baseindex = 0;
 770       i.types[this_operand] = operand_type_or (i.types[this_operand],
 771                                                temp);
 772       i.types[this_operand].bitfield.unspecified = 0;
 773       ++i.reg_operands;
 774     }
 775   else if (intel_state.base
 776            || intel_state.index
 777            || intel_state.seg
 778            || intel_state.is_mem)
 779     {
 780       /* Memory operand.  */
 781       if (i.mem_operands
 782           >= 2 - !current_templates->start->opcode_modifier.isstring)
 783         {
 784           /* Handle
 785
 786              call       0x9090,0x90909090
 787              lcall      0x9090,0x90909090
 788              jmp        0x9090,0x90909090
 789              ljmp       0x9090,0x90909090
 790            */
 791
 792           if ((current_templates->start->opcode_modifier.jumpintersegment
 793                || current_templates->start->opcode_modifier.jumpdword
 794                || current_templates->start->opcode_modifier.jump)
 795               && this_operand == 1
 796               && intel_state.seg == NULL
 797               && i.mem_operands == 1
 798               && i.disp_operands == 1
 799               && intel_state.op_modifier == O_absent)
 800             {
 801               /* Try to process the first operand as immediate,  */
 802               this_operand = 0;
 803               if (i386_finalize_immediate (exp_seg, i.op[0].imms,
 804                                            intel_state.reloc_types,
 805                                            NULL))
 806                 {
 807                   this_operand = 1;
 808                   expP = &im_expressions[0];
 809                   i.op[this_operand].imms = expP;
 810                   *expP = exp;
 811
 812                   /* Try to process the second operand as immediate,  */
 813                   if (i386_finalize_immediate (exp_seg, expP,
 814                                                intel_state.reloc_types,
 815                                                NULL))
 816                     {
 817                       i.mem_operands = 0;
 818                       i.disp_operands = 0;
 819                       i.imm_operands = 2;
 820                       i.types[0].bitfield.mem = 0;
 821                       i.types[0].bitfield.disp16 = 0;
 822                       i.types[0].bitfield.disp32 = 0;
 823                       i.types[0].bitfield.disp32s = 0;
 824                       return 1;
 825                     }
 826                 }
 827             }
 828
 829           as_bad (_("too many memory references for `%s'"),
 830                   current_templates->start->name);
 831           return 0;
 832         }
 833
 834       expP = &disp_expressions[i.disp_operands];
 835       memcpy (expP, &exp, sizeof(exp));
 836       resolve_expression (expP);
 837
 838       if (expP->X_op != O_constant
 839           || expP->X_add_number
 840           || (!intel_state.base
 841               && !intel_state.index))
 842         {
 843           i.op[this_operand].disps = expP;
 844           i.disp_operands++;
 845
 846           if (flag_code == CODE_64BIT)
 847             {
 848               i.types[this_operand].bitfield.disp32 = 1;
 849               if (!i.prefix[ADDR_PREFIX])
 850                 {
 851                   i.types[this_operand].bitfield.disp64 = 1;
 852                   i.types[this_operand].bitfield.disp32s = 1;
 853                 }
 854             }
 855           else if (!i.prefix[ADDR_PREFIX] ^ (flag_code == CODE_16BIT))
 856             i.types[this_operand].bitfield.disp32 = 1;
 857           else
 858             i.types[this_operand].bitfield.disp16 = 1;
 859
 860 #if defined (OBJ_AOUT) || defined (OBJ_MAYBE_AOUT)
 861           /*
 862            * exp_seg is used only for verification in
 863            * i386_finalize_displacement, and we can end up seeing reg_section
 864            * here - but we know we removed all registers from the expression
 865            * (or error-ed on any remaining ones) in i386_intel_simplify.  I
 866            * consider the check in i386_finalize_displacement bogus anyway, in
 867            * particular because it doesn't allow for expr_section, so I'd
 868            * rather see that check (and the similar one in
 869            * i386_finalize_immediate) use SEG_NORMAL(), but not being an a.out
 870            * expert I can't really say whether that would have other bad side
 871            * effects.
 872            */
 873           if (OUTPUT_FLAVOR == bfd_target_aout_flavour
 874               && exp_seg == reg_section)
 875             exp_seg = expP->X_op != O_constant ? undefined_section
 876                                                : absolute_section;
 877 #endif
 878
 879           if (!i386_finalize_displacement (exp_seg, expP,
 880                                            intel_state.reloc_types,
 881                                            operand_string))
 882             return 0;
 883         }
 884
 885       if (intel_state.base || intel_state.index)
 886         i.types[this_operand].bitfield.baseindex = 1;
 887
 888       if (intel_state.seg)
 889         {
 890           for (;;)
 891             {
 892               expP = symbol_get_value_expression (intel_state.seg);
 893               if (expP->X_op != O_full_ptr)
 894                 break;
 895               intel_state.seg = expP->X_add_symbol;
 896             }
 897           if (expP->X_op != O_register)
 898             {
 899               as_bad (_("segment register name expected"));
 900               return 0;
 901             }
 902           if (!i386_regtab[expP->X_add_number].reg_type.bitfield.sreg2
 903               && !i386_regtab[expP->X_add_number].reg_type.bitfield.sreg3)
 904             {
 905               as_bad (_("invalid use of register"));
 906               return 0;
 907             }
 908           switch (i386_regtab[expP->X_add_number].reg_num)
 909             {
 910             case 0: i.seg[i.mem_operands] = &es; break;
 911             case 1: i.seg[i.mem_operands] = &cs; break;
 912             case 2: i.seg[i.mem_operands] = &ss; break;
 913             case 3: i.seg[i.mem_operands] = &ds; break;
 914             case 4: i.seg[i.mem_operands] = &fs; break;
 915             case 5: i.seg[i.mem_operands] = &gs; break;
 916             case RegFlat: i.seg[i.mem_operands] = NULL; break;
 917             }
 918         }
 919
 920       /* Swap base and index in 16-bit memory operands like
 921          [si+bx]. Since i386_index_check is also used in AT&T
 922          mode we have to do that here.  */
 923       if (intel_state.base
 924           && intel_state.index
 925           && intel_state.base->reg_type.bitfield.reg16
 926           && intel_state.index->reg_type.bitfield.reg16
 927           && intel_state.base->reg_num >= 6
 928           && intel_state.index->reg_num < 6)
 929         {
 930           i.base_reg = intel_state.index;
 931           i.index_reg = intel_state.base;
 932         }
 933       else
 934         {
 935           i.base_reg = intel_state.base;
 936           i.index_reg = intel_state.index;
 937         }
 938
 939       if (!i386_index_check (operand_string))
 940         return 0;
 941
 942       i.types[this_operand].bitfield.mem = 1;
 943       ++i.mem_operands;
 944     }
 945   else
 946     {
 947       /* Immediate.  */
 948       if (i.imm_operands >= MAX_IMMEDIATE_OPERANDS)
 949         {
 950           as_bad (_("at most %d immediate operands are allowed"),
 951                   MAX_IMMEDIATE_OPERANDS);
 952           return 0;
 953         }
 954
 955       expP = &im_expressions[i.imm_operands++];
 956       i.op[this_operand].imms = expP;
 957       *expP = exp;
 958
 959       return i386_finalize_immediate (exp_seg, expP, intel_state.reloc_types,
 960                                       operand_string);
 961     }
 962
 963   return 1;
 964 }