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 } 965