| 1 | /* m68k.y -- bison grammar for m68k operand parsing |
| 2 | Copyright 1995, 1996, 1997, 1998, 2001 Free Software Foundation, Inc. |
| 3 | Written by Ken Raeburn and Ian Lance Taylor, Cygnus Support |
| 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 2, 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, 59 Temple Place - Suite 330, Boston, MA |
| 20 | 02111-1307, USA. */ |
| 21 | |
| 22 | /* This file holds a bison grammar to parse m68k operands. The m68k |
| 23 | has a complicated operand syntax, and gas supports two main |
| 24 | variations of it. Using a grammar is probably overkill, but at |
| 25 | least it makes clear exactly what we do support. */ |
| 26 | |
| 27 | %{ |
| 28 | |
| 29 | #include "as.h" |
| 30 | #include "tc-m68k.h" |
| 31 | #include "m68k-parse.h" |
| 32 | #include "safe-ctype.h" |
| 33 | |
| 34 | /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, |
| 35 | etc), as well as gratuitiously global symbol names If other parser |
| 36 | generators (bison, byacc, etc) produce additional global names that |
| 37 | conflict at link time, then those parser generators need to be |
| 38 | fixed instead of adding those names to this list. */ |
| 39 | |
| 40 | #define yymaxdepth m68k_maxdepth |
| 41 | #define yyparse m68k_parse |
| 42 | #define yylex m68k_lex |
| 43 | #define yyerror m68k_error |
| 44 | #define yylval m68k_lval |
| 45 | #define yychar m68k_char |
| 46 | #define yydebug m68k_debug |
| 47 | #define yypact m68k_pact |
| 48 | #define yyr1 m68k_r1 |
| 49 | #define yyr2 m68k_r2 |
| 50 | #define yydef m68k_def |
| 51 | #define yychk m68k_chk |
| 52 | #define yypgo m68k_pgo |
| 53 | #define yyact m68k_act |
| 54 | #define yyexca m68k_exca |
| 55 | #define yyerrflag m68k_errflag |
| 56 | #define yynerrs m68k_nerrs |
| 57 | #define yyps m68k_ps |
| 58 | #define yypv m68k_pv |
| 59 | #define yys m68k_s |
| 60 | #define yy_yys m68k_yys |
| 61 | #define yystate m68k_state |
| 62 | #define yytmp m68k_tmp |
| 63 | #define yyv m68k_v |
| 64 | #define yy_yyv m68k_yyv |
| 65 | #define yyval m68k_val |
| 66 | #define yylloc m68k_lloc |
| 67 | #define yyreds m68k_reds /* With YYDEBUG defined */ |
| 68 | #define yytoks m68k_toks /* With YYDEBUG defined */ |
| 69 | #define yylhs m68k_yylhs |
| 70 | #define yylen m68k_yylen |
| 71 | #define yydefred m68k_yydefred |
| 72 | #define yydgoto m68k_yydgoto |
| 73 | #define yysindex m68k_yysindex |
| 74 | #define yyrindex m68k_yyrindex |
| 75 | #define yygindex m68k_yygindex |
| 76 | #define yytable m68k_yytable |
| 77 | #define yycheck m68k_yycheck |
| 78 | |
| 79 | #ifndef YYDEBUG |
| 80 | #define YYDEBUG 1 |
| 81 | #endif |
| 82 | |
| 83 | /* Internal functions. */ |
| 84 | |
| 85 | static enum m68k_register m68k_reg_parse PARAMS ((char **)); |
| 86 | static int yylex PARAMS ((void)); |
| 87 | static void yyerror PARAMS ((const char *)); |
| 88 | |
| 89 | /* The parser sets fields pointed to by this global variable. */ |
| 90 | static struct m68k_op *op; |
| 91 | |
| 92 | %} |
| 93 | |
| 94 | %union |
| 95 | { |
| 96 | struct m68k_indexreg indexreg; |
| 97 | enum m68k_register reg; |
| 98 | struct m68k_exp exp; |
| 99 | unsigned long mask; |
| 100 | int onereg; |
| 101 | } |
| 102 | |
| 103 | %token <reg> DR AR FPR FPCR LPC ZAR ZDR LZPC CREG |
| 104 | %token <indexreg> INDEXREG |
| 105 | %token <exp> EXPR |
| 106 | |
| 107 | %type <indexreg> zireg zdireg |
| 108 | %type <reg> zadr zdr apc zapc zpc optzapc optczapc |
| 109 | %type <exp> optcexpr optexprc |
| 110 | %type <mask> reglist ireglist reglistpair |
| 111 | %type <onereg> reglistreg |
| 112 | |
| 113 | %% |
| 114 | |
| 115 | /* An operand. */ |
| 116 | |
| 117 | operand: |
| 118 | generic_operand |
| 119 | | motorola_operand |
| 120 | | mit_operand |
| 121 | ; |
| 122 | |
| 123 | /* A generic operand. */ |
| 124 | |
| 125 | generic_operand: |
| 126 | DR |
| 127 | { |
| 128 | op->mode = DREG; |
| 129 | op->reg = $1; |
| 130 | } |
| 131 | | AR |
| 132 | { |
| 133 | op->mode = AREG; |
| 134 | op->reg = $1; |
| 135 | } |
| 136 | | FPR |
| 137 | { |
| 138 | op->mode = FPREG; |
| 139 | op->reg = $1; |
| 140 | } |
| 141 | | FPCR |
| 142 | { |
| 143 | op->mode = CONTROL; |
| 144 | op->reg = $1; |
| 145 | } |
| 146 | | CREG |
| 147 | { |
| 148 | op->mode = CONTROL; |
| 149 | op->reg = $1; |
| 150 | } |
| 151 | | EXPR |
| 152 | { |
| 153 | op->mode = ABSL; |
| 154 | op->disp = $1; |
| 155 | } |
| 156 | | '#' EXPR |
| 157 | { |
| 158 | op->mode = IMMED; |
| 159 | op->disp = $2; |
| 160 | } |
| 161 | | '&' EXPR |
| 162 | { |
| 163 | op->mode = IMMED; |
| 164 | op->disp = $2; |
| 165 | } |
| 166 | | reglist |
| 167 | { |
| 168 | op->mode = REGLST; |
| 169 | op->mask = $1; |
| 170 | } |
| 171 | ; |
| 172 | |
| 173 | /* An operand in Motorola syntax. This includes MRI syntax as well, |
| 174 | which may or may not be different in that it permits commutativity |
| 175 | of index and base registers, and permits an offset expression to |
| 176 | appear inside or outside of the parentheses. */ |
| 177 | |
| 178 | motorola_operand: |
| 179 | '(' AR ')' |
| 180 | { |
| 181 | op->mode = AINDR; |
| 182 | op->reg = $2; |
| 183 | } |
| 184 | | '(' AR ')' '+' |
| 185 | { |
| 186 | op->mode = AINC; |
| 187 | op->reg = $2; |
| 188 | } |
| 189 | | '-' '(' AR ')' |
| 190 | { |
| 191 | op->mode = ADEC; |
| 192 | op->reg = $3; |
| 193 | } |
| 194 | | '(' EXPR ',' zapc ')' |
| 195 | { |
| 196 | op->reg = $4; |
| 197 | op->disp = $2; |
| 198 | if (($4 >= ZADDR0 && $4 <= ZADDR7) |
| 199 | || $4 == ZPC) |
| 200 | op->mode = BASE; |
| 201 | else |
| 202 | op->mode = DISP; |
| 203 | } |
| 204 | | '(' zapc ',' EXPR ')' |
| 205 | { |
| 206 | op->reg = $2; |
| 207 | op->disp = $4; |
| 208 | if (($2 >= ZADDR0 && $2 <= ZADDR7) |
| 209 | || $2 == ZPC) |
| 210 | op->mode = BASE; |
| 211 | else |
| 212 | op->mode = DISP; |
| 213 | } |
| 214 | | EXPR '(' zapc ')' |
| 215 | { |
| 216 | op->reg = $3; |
| 217 | op->disp = $1; |
| 218 | if (($3 >= ZADDR0 && $3 <= ZADDR7) |
| 219 | || $3 == ZPC) |
| 220 | op->mode = BASE; |
| 221 | else |
| 222 | op->mode = DISP; |
| 223 | } |
| 224 | | '(' LPC ')' |
| 225 | { |
| 226 | op->mode = DISP; |
| 227 | op->reg = $2; |
| 228 | } |
| 229 | | '(' ZAR ')' |
| 230 | { |
| 231 | op->mode = BASE; |
| 232 | op->reg = $2; |
| 233 | } |
| 234 | | '(' LZPC ')' |
| 235 | { |
| 236 | op->mode = BASE; |
| 237 | op->reg = $2; |
| 238 | } |
| 239 | | '(' EXPR ',' zapc ',' zireg ')' |
| 240 | { |
| 241 | op->mode = BASE; |
| 242 | op->reg = $4; |
| 243 | op->disp = $2; |
| 244 | op->index = $6; |
| 245 | } |
| 246 | | '(' EXPR ',' zapc ',' zpc ')' |
| 247 | { |
| 248 | if ($4 == PC || $4 == ZPC) |
| 249 | yyerror (_("syntax error")); |
| 250 | op->mode = BASE; |
| 251 | op->reg = $6; |
| 252 | op->disp = $2; |
| 253 | op->index.reg = $4; |
| 254 | op->index.size = SIZE_UNSPEC; |
| 255 | op->index.scale = 1; |
| 256 | } |
| 257 | | '(' EXPR ',' zdireg optczapc ')' |
| 258 | { |
| 259 | op->mode = BASE; |
| 260 | op->reg = $5; |
| 261 | op->disp = $2; |
| 262 | op->index = $4; |
| 263 | } |
| 264 | | '(' zdireg ',' EXPR ')' |
| 265 | { |
| 266 | op->mode = BASE; |
| 267 | op->disp = $4; |
| 268 | op->index = $2; |
| 269 | } |
| 270 | | EXPR '(' zapc ',' zireg ')' |
| 271 | { |
| 272 | op->mode = BASE; |
| 273 | op->reg = $3; |
| 274 | op->disp = $1; |
| 275 | op->index = $5; |
| 276 | } |
| 277 | | '(' zapc ',' zireg ')' |
| 278 | { |
| 279 | op->mode = BASE; |
| 280 | op->reg = $2; |
| 281 | op->index = $4; |
| 282 | } |
| 283 | | EXPR '(' zapc ',' zpc ')' |
| 284 | { |
| 285 | if ($3 == PC || $3 == ZPC) |
| 286 | yyerror (_("syntax error")); |
| 287 | op->mode = BASE; |
| 288 | op->reg = $5; |
| 289 | op->disp = $1; |
| 290 | op->index.reg = $3; |
| 291 | op->index.size = SIZE_UNSPEC; |
| 292 | op->index.scale = 1; |
| 293 | } |
| 294 | | '(' zapc ',' zpc ')' |
| 295 | { |
| 296 | if ($2 == PC || $2 == ZPC) |
| 297 | yyerror (_("syntax error")); |
| 298 | op->mode = BASE; |
| 299 | op->reg = $4; |
| 300 | op->index.reg = $2; |
| 301 | op->index.size = SIZE_UNSPEC; |
| 302 | op->index.scale = 1; |
| 303 | } |
| 304 | | EXPR '(' zdireg optczapc ')' |
| 305 | { |
| 306 | op->mode = BASE; |
| 307 | op->reg = $4; |
| 308 | op->disp = $1; |
| 309 | op->index = $3; |
| 310 | } |
| 311 | | '(' zdireg optczapc ')' |
| 312 | { |
| 313 | op->mode = BASE; |
| 314 | op->reg = $3; |
| 315 | op->index = $2; |
| 316 | } |
| 317 | | '(' '[' EXPR optczapc ']' ',' zireg optcexpr ')' |
| 318 | { |
| 319 | op->mode = POST; |
| 320 | op->reg = $4; |
| 321 | op->disp = $3; |
| 322 | op->index = $7; |
| 323 | op->odisp = $8; |
| 324 | } |
| 325 | | '(' '[' EXPR optczapc ']' optcexpr ')' |
| 326 | { |
| 327 | op->mode = POST; |
| 328 | op->reg = $4; |
| 329 | op->disp = $3; |
| 330 | op->odisp = $6; |
| 331 | } |
| 332 | | '(' '[' zapc ']' ',' zireg optcexpr ')' |
| 333 | { |
| 334 | op->mode = POST; |
| 335 | op->reg = $3; |
| 336 | op->index = $6; |
| 337 | op->odisp = $7; |
| 338 | } |
| 339 | | '(' '[' zapc ']' optcexpr ')' |
| 340 | { |
| 341 | op->mode = POST; |
| 342 | op->reg = $3; |
| 343 | op->odisp = $5; |
| 344 | } |
| 345 | | '(' '[' EXPR ',' zapc ',' zireg ']' optcexpr ')' |
| 346 | { |
| 347 | op->mode = PRE; |
| 348 | op->reg = $5; |
| 349 | op->disp = $3; |
| 350 | op->index = $7; |
| 351 | op->odisp = $9; |
| 352 | } |
| 353 | | '(' '[' zapc ',' zireg ']' optcexpr ')' |
| 354 | { |
| 355 | op->mode = PRE; |
| 356 | op->reg = $3; |
| 357 | op->index = $5; |
| 358 | op->odisp = $7; |
| 359 | } |
| 360 | | '(' '[' EXPR ',' zapc ',' zpc ']' optcexpr ')' |
| 361 | { |
| 362 | if ($5 == PC || $5 == ZPC) |
| 363 | yyerror (_("syntax error")); |
| 364 | op->mode = PRE; |
| 365 | op->reg = $7; |
| 366 | op->disp = $3; |
| 367 | op->index.reg = $5; |
| 368 | op->index.size = SIZE_UNSPEC; |
| 369 | op->index.scale = 1; |
| 370 | op->odisp = $9; |
| 371 | } |
| 372 | | '(' '[' zapc ',' zpc ']' optcexpr ')' |
| 373 | { |
| 374 | if ($3 == PC || $3 == ZPC) |
| 375 | yyerror (_("syntax error")); |
| 376 | op->mode = PRE; |
| 377 | op->reg = $5; |
| 378 | op->index.reg = $3; |
| 379 | op->index.size = SIZE_UNSPEC; |
| 380 | op->index.scale = 1; |
| 381 | op->odisp = $7; |
| 382 | } |
| 383 | | '(' '[' optexprc zdireg optczapc ']' optcexpr ')' |
| 384 | { |
| 385 | op->mode = PRE; |
| 386 | op->reg = $5; |
| 387 | op->disp = $3; |
| 388 | op->index = $4; |
| 389 | op->odisp = $7; |
| 390 | } |
| 391 | ; |
| 392 | |
| 393 | /* An operand in MIT syntax. */ |
| 394 | |
| 395 | mit_operand: |
| 396 | optzapc '@' |
| 397 | { |
| 398 | /* We use optzapc to avoid a shift/reduce conflict. */ |
| 399 | if ($1 < ADDR0 || $1 > ADDR7) |
| 400 | yyerror (_("syntax error")); |
| 401 | op->mode = AINDR; |
| 402 | op->reg = $1; |
| 403 | } |
| 404 | | optzapc '@' '+' |
| 405 | { |
| 406 | /* We use optzapc to avoid a shift/reduce conflict. */ |
| 407 | if ($1 < ADDR0 || $1 > ADDR7) |
| 408 | yyerror (_("syntax error")); |
| 409 | op->mode = AINC; |
| 410 | op->reg = $1; |
| 411 | } |
| 412 | | optzapc '@' '-' |
| 413 | { |
| 414 | /* We use optzapc to avoid a shift/reduce conflict. */ |
| 415 | if ($1 < ADDR0 || $1 > ADDR7) |
| 416 | yyerror (_("syntax error")); |
| 417 | op->mode = ADEC; |
| 418 | op->reg = $1; |
| 419 | } |
| 420 | | optzapc '@' '(' EXPR ')' |
| 421 | { |
| 422 | op->reg = $1; |
| 423 | op->disp = $4; |
| 424 | if (($1 >= ZADDR0 && $1 <= ZADDR7) |
| 425 | || $1 == ZPC) |
| 426 | op->mode = BASE; |
| 427 | else |
| 428 | op->mode = DISP; |
| 429 | } |
| 430 | | optzapc '@' '(' optexprc zireg ')' |
| 431 | { |
| 432 | op->mode = BASE; |
| 433 | op->reg = $1; |
| 434 | op->disp = $4; |
| 435 | op->index = $5; |
| 436 | } |
| 437 | | optzapc '@' '(' EXPR ')' '@' '(' optexprc zireg ')' |
| 438 | { |
| 439 | op->mode = POST; |
| 440 | op->reg = $1; |
| 441 | op->disp = $4; |
| 442 | op->index = $9; |
| 443 | op->odisp = $8; |
| 444 | } |
| 445 | | optzapc '@' '(' EXPR ')' '@' '(' EXPR ')' |
| 446 | { |
| 447 | op->mode = POST; |
| 448 | op->reg = $1; |
| 449 | op->disp = $4; |
| 450 | op->odisp = $8; |
| 451 | } |
| 452 | | optzapc '@' '(' optexprc zireg ')' '@' '(' EXPR ')' |
| 453 | { |
| 454 | op->mode = PRE; |
| 455 | op->reg = $1; |
| 456 | op->disp = $4; |
| 457 | op->index = $5; |
| 458 | op->odisp = $9; |
| 459 | } |
| 460 | ; |
| 461 | |
| 462 | /* An index register, possibly suppressed, which need not have a size |
| 463 | or scale. */ |
| 464 | |
| 465 | zireg: |
| 466 | INDEXREG |
| 467 | | zadr |
| 468 | { |
| 469 | $$.reg = $1; |
| 470 | $$.size = SIZE_UNSPEC; |
| 471 | $$.scale = 1; |
| 472 | } |
| 473 | ; |
| 474 | |
| 475 | /* A register which may be an index register, but which may not be an |
| 476 | address register. This nonterminal is used to avoid ambiguity when |
| 477 | trying to parse something like (0,d5,a6) as compared to (0,a6,d5). */ |
| 478 | |
| 479 | zdireg: |
| 480 | INDEXREG |
| 481 | | zdr |
| 482 | { |
| 483 | $$.reg = $1; |
| 484 | $$.size = SIZE_UNSPEC; |
| 485 | $$.scale = 1; |
| 486 | } |
| 487 | ; |
| 488 | |
| 489 | /* An address or data register, or a suppressed address or data |
| 490 | register. */ |
| 491 | |
| 492 | zadr: |
| 493 | zdr |
| 494 | | AR |
| 495 | | ZAR |
| 496 | ; |
| 497 | |
| 498 | /* A data register which may be suppressed. */ |
| 499 | |
| 500 | zdr: |
| 501 | DR |
| 502 | | ZDR |
| 503 | ; |
| 504 | |
| 505 | /* Either an address register or the PC. */ |
| 506 | |
| 507 | apc: |
| 508 | AR |
| 509 | | LPC |
| 510 | ; |
| 511 | |
| 512 | /* Either an address register, or the PC, or a suppressed address |
| 513 | register, or a suppressed PC. */ |
| 514 | |
| 515 | zapc: |
| 516 | apc |
| 517 | | LZPC |
| 518 | | ZAR |
| 519 | ; |
| 520 | |
| 521 | /* An optional zapc. */ |
| 522 | |
| 523 | optzapc: |
| 524 | /* empty */ |
| 525 | { |
| 526 | $$ = ZADDR0; |
| 527 | } |
| 528 | | zapc |
| 529 | ; |
| 530 | |
| 531 | /* The PC, optionally suppressed. */ |
| 532 | |
| 533 | zpc: |
| 534 | LPC |
| 535 | | LZPC |
| 536 | ; |
| 537 | |
| 538 | /* ',' zapc when it may be omitted. */ |
| 539 | |
| 540 | optczapc: |
| 541 | /* empty */ |
| 542 | { |
| 543 | $$ = ZADDR0; |
| 544 | } |
| 545 | | ',' zapc |
| 546 | { |
| 547 | $$ = $2; |
| 548 | } |
| 549 | ; |
| 550 | |
| 551 | /* ',' EXPR when it may be omitted. */ |
| 552 | |
| 553 | optcexpr: |
| 554 | /* empty */ |
| 555 | { |
| 556 | $$.exp.X_op = O_absent; |
| 557 | $$.size = SIZE_UNSPEC; |
| 558 | } |
| 559 | | ',' EXPR |
| 560 | { |
| 561 | $$ = $2; |
| 562 | } |
| 563 | ; |
| 564 | |
| 565 | /* EXPR ',' when it may be omitted. */ |
| 566 | |
| 567 | optexprc: |
| 568 | /* empty */ |
| 569 | { |
| 570 | $$.exp.X_op = O_absent; |
| 571 | $$.size = SIZE_UNSPEC; |
| 572 | } |
| 573 | | EXPR ',' |
| 574 | { |
| 575 | $$ = $1; |
| 576 | } |
| 577 | ; |
| 578 | |
| 579 | /* A register list for the movem instruction. */ |
| 580 | |
| 581 | reglist: |
| 582 | reglistpair |
| 583 | | reglistpair '/' ireglist |
| 584 | { |
| 585 | $$ = $1 | $3; |
| 586 | } |
| 587 | | reglistreg '/' ireglist |
| 588 | { |
| 589 | $$ = (1 << $1) | $3; |
| 590 | } |
| 591 | ; |
| 592 | |
| 593 | /* We use ireglist when we know we are looking at a reglist, and we |
| 594 | can safely reduce a simple register to reglistreg. If we permitted |
| 595 | reglist to reduce to reglistreg, it would be ambiguous whether a |
| 596 | plain register were a DREG/AREG/FPREG or a REGLST. */ |
| 597 | |
| 598 | ireglist: |
| 599 | reglistreg |
| 600 | { |
| 601 | $$ = 1 << $1; |
| 602 | } |
| 603 | | reglistpair |
| 604 | | reglistpair '/' ireglist |
| 605 | { |
| 606 | $$ = $1 | $3; |
| 607 | } |
| 608 | | reglistreg '/' ireglist |
| 609 | { |
| 610 | $$ = (1 << $1) | $3; |
| 611 | } |
| 612 | ; |
| 613 | |
| 614 | reglistpair: |
| 615 | reglistreg '-' reglistreg |
| 616 | { |
| 617 | if ($1 <= $3) |
| 618 | $$ = (1 << ($3 + 1)) - 1 - ((1 << $1) - 1); |
| 619 | else |
| 620 | $$ = (1 << ($1 + 1)) - 1 - ((1 << $3) - 1); |
| 621 | } |
| 622 | ; |
| 623 | |
| 624 | reglistreg: |
| 625 | DR |
| 626 | { |
| 627 | $$ = $1 - DATA0; |
| 628 | } |
| 629 | | AR |
| 630 | { |
| 631 | $$ = $1 - ADDR0 + 8; |
| 632 | } |
| 633 | | FPR |
| 634 | { |
| 635 | $$ = $1 - FP0 + 16; |
| 636 | } |
| 637 | | FPCR |
| 638 | { |
| 639 | if ($1 == FPI) |
| 640 | $$ = 24; |
| 641 | else if ($1 == FPS) |
| 642 | $$ = 25; |
| 643 | else |
| 644 | $$ = 26; |
| 645 | } |
| 646 | ; |
| 647 | |
| 648 | %% |
| 649 | |
| 650 | /* The string to parse is stored here, and modified by yylex. */ |
| 651 | |
| 652 | static char *str; |
| 653 | |
| 654 | /* The original string pointer. */ |
| 655 | |
| 656 | static char *strorig; |
| 657 | |
| 658 | /* If *CCP could be a register, return the register number and advance |
| 659 | *CCP. Otherwise don't change *CCP, and return 0. */ |
| 660 | |
| 661 | static enum m68k_register |
| 662 | m68k_reg_parse (ccp) |
| 663 | register char **ccp; |
| 664 | { |
| 665 | char *start = *ccp; |
| 666 | char c; |
| 667 | char *p; |
| 668 | symbolS *symbolp; |
| 669 | |
| 670 | if (flag_reg_prefix_optional) |
| 671 | { |
| 672 | if (*start == REGISTER_PREFIX) |
| 673 | start++; |
| 674 | p = start; |
| 675 | } |
| 676 | else |
| 677 | { |
| 678 | if (*start != REGISTER_PREFIX) |
| 679 | return 0; |
| 680 | p = start + 1; |
| 681 | } |
| 682 | |
| 683 | if (! is_name_beginner (*p)) |
| 684 | return 0; |
| 685 | |
| 686 | p++; |
| 687 | while (is_part_of_name (*p) && *p != '.' && *p != ':' && *p != '*') |
| 688 | p++; |
| 689 | |
| 690 | c = *p; |
| 691 | *p = 0; |
| 692 | symbolp = symbol_find (start); |
| 693 | *p = c; |
| 694 | |
| 695 | if (symbolp != NULL && S_GET_SEGMENT (symbolp) == reg_section) |
| 696 | { |
| 697 | *ccp = p; |
| 698 | return S_GET_VALUE (symbolp); |
| 699 | } |
| 700 | |
| 701 | /* In MRI mode, something like foo.bar can be equated to a register |
| 702 | name. */ |
| 703 | while (flag_mri && c == '.') |
| 704 | { |
| 705 | ++p; |
| 706 | while (is_part_of_name (*p) && *p != '.' && *p != ':' && *p != '*') |
| 707 | p++; |
| 708 | c = *p; |
| 709 | *p = '\0'; |
| 710 | symbolp = symbol_find (start); |
| 711 | *p = c; |
| 712 | if (symbolp != NULL && S_GET_SEGMENT (symbolp) == reg_section) |
| 713 | { |
| 714 | *ccp = p; |
| 715 | return S_GET_VALUE (symbolp); |
| 716 | } |
| 717 | } |
| 718 | |
| 719 | return 0; |
| 720 | } |
| 721 | |
| 722 | /* The lexer. */ |
| 723 | |
| 724 | static int |
| 725 | yylex () |
| 726 | { |
| 727 | enum m68k_register reg; |
| 728 | char *s; |
| 729 | int parens; |
| 730 | int c = 0; |
| 731 | int tail = 0; |
| 732 | char *hold; |
| 733 | |
| 734 | if (*str == ' ') |
| 735 | ++str; |
| 736 | |
| 737 | if (*str == '\0') |
| 738 | return 0; |
| 739 | |
| 740 | /* Various special characters are just returned directly. */ |
| 741 | switch (*str) |
| 742 | { |
| 743 | case '@': |
| 744 | /* In MRI mode, this can be the start of an octal number. */ |
| 745 | if (flag_mri) |
| 746 | { |
| 747 | if (ISDIGIT (str[1]) |
| 748 | || ((str[1] == '+' || str[1] == '-') |
| 749 | && ISDIGIT (str[2]))) |
| 750 | break; |
| 751 | } |
| 752 | /* Fall through. */ |
| 753 | case '#': |
| 754 | case '&': |
| 755 | case ',': |
| 756 | case ')': |
| 757 | case '/': |
| 758 | case '[': |
| 759 | case ']': |
| 760 | return *str++; |
| 761 | case '+': |
| 762 | /* It so happens that a '+' can only appear at the end of an |
| 763 | operand. If it appears anywhere else, it must be a unary |
| 764 | plus on an expression. */ |
| 765 | if (str[1] == '\0') |
| 766 | return *str++; |
| 767 | break; |
| 768 | case '-': |
| 769 | /* A '-' can only appear in -(ar), rn-rn, or ar@-. If it |
| 770 | appears anywhere else, it must be a unary minus on an |
| 771 | expression. */ |
| 772 | if (str[1] == '\0') |
| 773 | return *str++; |
| 774 | s = str + 1; |
| 775 | if (*s == '(') |
| 776 | ++s; |
| 777 | if (m68k_reg_parse (&s) != 0) |
| 778 | return *str++; |
| 779 | break; |
| 780 | case '(': |
| 781 | /* A '(' can only appear in `(reg)', `(expr,...', `([', `@(', or |
| 782 | `)('. If it appears anywhere else, it must be starting an |
| 783 | expression. */ |
| 784 | if (str[1] == '[' |
| 785 | || (str > strorig |
| 786 | && (str[-1] == '@' |
| 787 | || str[-1] == ')'))) |
| 788 | return *str++; |
| 789 | s = str + 1; |
| 790 | if (m68k_reg_parse (&s) != 0) |
| 791 | return *str++; |
| 792 | /* Check for the case of '(expr,...' by scanning ahead. If we |
| 793 | find a comma outside of balanced parentheses, we return '('. |
| 794 | If we find an unbalanced right parenthesis, then presumably |
| 795 | the '(' really starts an expression. */ |
| 796 | parens = 0; |
| 797 | for (s = str + 1; *s != '\0'; s++) |
| 798 | { |
| 799 | if (*s == '(') |
| 800 | ++parens; |
| 801 | else if (*s == ')') |
| 802 | { |
| 803 | if (parens == 0) |
| 804 | break; |
| 805 | --parens; |
| 806 | } |
| 807 | else if (*s == ',' && parens == 0) |
| 808 | { |
| 809 | /* A comma can not normally appear in an expression, so |
| 810 | this is a case of '(expr,...'. */ |
| 811 | return *str++; |
| 812 | } |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | /* See if it's a register. */ |
| 817 | |
| 818 | reg = m68k_reg_parse (&str); |
| 819 | if (reg != 0) |
| 820 | { |
| 821 | int ret; |
| 822 | |
| 823 | yylval.reg = reg; |
| 824 | |
| 825 | if (reg >= DATA0 && reg <= DATA7) |
| 826 | ret = DR; |
| 827 | else if (reg >= ADDR0 && reg <= ADDR7) |
| 828 | ret = AR; |
| 829 | else if (reg >= FP0 && reg <= FP7) |
| 830 | return FPR; |
| 831 | else if (reg == FPI |
| 832 | || reg == FPS |
| 833 | || reg == FPC) |
| 834 | return FPCR; |
| 835 | else if (reg == PC) |
| 836 | return LPC; |
| 837 | else if (reg >= ZDATA0 && reg <= ZDATA7) |
| 838 | ret = ZDR; |
| 839 | else if (reg >= ZADDR0 && reg <= ZADDR7) |
| 840 | ret = ZAR; |
| 841 | else if (reg == ZPC) |
| 842 | return LZPC; |
| 843 | else |
| 844 | return CREG; |
| 845 | |
| 846 | /* If we get here, we have a data or address register. We |
| 847 | must check for a size or scale; if we find one, we must |
| 848 | return INDEXREG. */ |
| 849 | |
| 850 | s = str; |
| 851 | |
| 852 | if (*s != '.' && *s != ':' && *s != '*') |
| 853 | return ret; |
| 854 | |
| 855 | yylval.indexreg.reg = reg; |
| 856 | |
| 857 | if (*s != '.' && *s != ':') |
| 858 | yylval.indexreg.size = SIZE_UNSPEC; |
| 859 | else |
| 860 | { |
| 861 | ++s; |
| 862 | switch (*s) |
| 863 | { |
| 864 | case 'w': |
| 865 | case 'W': |
| 866 | yylval.indexreg.size = SIZE_WORD; |
| 867 | ++s; |
| 868 | break; |
| 869 | case 'l': |
| 870 | case 'L': |
| 871 | yylval.indexreg.size = SIZE_LONG; |
| 872 | ++s; |
| 873 | break; |
| 874 | default: |
| 875 | yyerror (_("illegal size specification")); |
| 876 | yylval.indexreg.size = SIZE_UNSPEC; |
| 877 | break; |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | yylval.indexreg.scale = 1; |
| 882 | |
| 883 | if (*s == '*' || *s == ':') |
| 884 | { |
| 885 | expressionS scale; |
| 886 | |
| 887 | ++s; |
| 888 | |
| 889 | hold = input_line_pointer; |
| 890 | input_line_pointer = s; |
| 891 | expression (&scale); |
| 892 | s = input_line_pointer; |
| 893 | input_line_pointer = hold; |
| 894 | |
| 895 | if (scale.X_op != O_constant) |
| 896 | yyerror (_("scale specification must resolve to a number")); |
| 897 | else |
| 898 | { |
| 899 | switch (scale.X_add_number) |
| 900 | { |
| 901 | case 1: |
| 902 | case 2: |
| 903 | case 4: |
| 904 | case 8: |
| 905 | yylval.indexreg.scale = scale.X_add_number; |
| 906 | break; |
| 907 | default: |
| 908 | yyerror (_("invalid scale value")); |
| 909 | break; |
| 910 | } |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | str = s; |
| 915 | |
| 916 | return INDEXREG; |
| 917 | } |
| 918 | |
| 919 | /* It must be an expression. Before we call expression, we need to |
| 920 | look ahead to see if there is a size specification. We must do |
| 921 | that first, because otherwise foo.l will be treated as the symbol |
| 922 | foo.l, rather than as the symbol foo with a long size |
| 923 | specification. The grammar requires that all expressions end at |
| 924 | the end of the operand, or with ',', '(', ']', ')'. */ |
| 925 | |
| 926 | parens = 0; |
| 927 | for (s = str; *s != '\0'; s++) |
| 928 | { |
| 929 | if (*s == '(') |
| 930 | { |
| 931 | if (parens == 0 |
| 932 | && s > str |
| 933 | && (s[-1] == ')' || ISALNUM (s[-1]))) |
| 934 | break; |
| 935 | ++parens; |
| 936 | } |
| 937 | else if (*s == ')') |
| 938 | { |
| 939 | if (parens == 0) |
| 940 | break; |
| 941 | --parens; |
| 942 | } |
| 943 | else if (parens == 0 |
| 944 | && (*s == ',' || *s == ']')) |
| 945 | break; |
| 946 | } |
| 947 | |
| 948 | yylval.exp.size = SIZE_UNSPEC; |
| 949 | if (s <= str + 2 |
| 950 | || (s[-2] != '.' && s[-2] != ':')) |
| 951 | tail = 0; |
| 952 | else |
| 953 | { |
| 954 | switch (s[-1]) |
| 955 | { |
| 956 | case 's': |
| 957 | case 'S': |
| 958 | case 'b': |
| 959 | case 'B': |
| 960 | yylval.exp.size = SIZE_BYTE; |
| 961 | break; |
| 962 | case 'w': |
| 963 | case 'W': |
| 964 | yylval.exp.size = SIZE_WORD; |
| 965 | break; |
| 966 | case 'l': |
| 967 | case 'L': |
| 968 | yylval.exp.size = SIZE_LONG; |
| 969 | break; |
| 970 | default: |
| 971 | break; |
| 972 | } |
| 973 | if (yylval.exp.size != SIZE_UNSPEC) |
| 974 | tail = 2; |
| 975 | } |
| 976 | |
| 977 | #ifdef OBJ_ELF |
| 978 | { |
| 979 | /* Look for @PLTPC, etc. */ |
| 980 | char *cp; |
| 981 | |
| 982 | yylval.exp.pic_reloc = pic_none; |
| 983 | cp = s - tail; |
| 984 | if (cp - 6 > str && cp[-6] == '@') |
| 985 | { |
| 986 | if (strncmp (cp - 6, "@PLTPC", 6) == 0) |
| 987 | { |
| 988 | yylval.exp.pic_reloc = pic_plt_pcrel; |
| 989 | tail += 6; |
| 990 | } |
| 991 | else if (strncmp (cp - 6, "@GOTPC", 6) == 0) |
| 992 | { |
| 993 | yylval.exp.pic_reloc = pic_got_pcrel; |
| 994 | tail += 6; |
| 995 | } |
| 996 | } |
| 997 | else if (cp - 4 > str && cp[-4] == '@') |
| 998 | { |
| 999 | if (strncmp (cp - 4, "@PLT", 4) == 0) |
| 1000 | { |
| 1001 | yylval.exp.pic_reloc = pic_plt_off; |
| 1002 | tail += 4; |
| 1003 | } |
| 1004 | else if (strncmp (cp - 4, "@GOT", 4) == 0) |
| 1005 | { |
| 1006 | yylval.exp.pic_reloc = pic_got_off; |
| 1007 | tail += 4; |
| 1008 | } |
| 1009 | } |
| 1010 | } |
| 1011 | #endif |
| 1012 | |
| 1013 | if (tail != 0) |
| 1014 | { |
| 1015 | c = s[-tail]; |
| 1016 | s[-tail] = 0; |
| 1017 | } |
| 1018 | |
| 1019 | hold = input_line_pointer; |
| 1020 | input_line_pointer = str; |
| 1021 | expression (&yylval.exp.exp); |
| 1022 | str = input_line_pointer; |
| 1023 | input_line_pointer = hold; |
| 1024 | |
| 1025 | if (tail != 0) |
| 1026 | { |
| 1027 | s[-tail] = c; |
| 1028 | str = s; |
| 1029 | } |
| 1030 | |
| 1031 | return EXPR; |
| 1032 | } |
| 1033 | |
| 1034 | /* Parse an m68k operand. This is the only function which is called |
| 1035 | from outside this file. */ |
| 1036 | |
| 1037 | int |
| 1038 | m68k_ip_op (s, oparg) |
| 1039 | char *s; |
| 1040 | struct m68k_op *oparg; |
| 1041 | { |
| 1042 | memset (oparg, 0, sizeof *oparg); |
| 1043 | oparg->error = NULL; |
| 1044 | oparg->index.reg = ZDATA0; |
| 1045 | oparg->index.scale = 1; |
| 1046 | oparg->disp.exp.X_op = O_absent; |
| 1047 | oparg->odisp.exp.X_op = O_absent; |
| 1048 | |
| 1049 | str = strorig = s; |
| 1050 | op = oparg; |
| 1051 | |
| 1052 | return yyparse (); |
| 1053 | } |
| 1054 | |
| 1055 | /* The error handler. */ |
| 1056 | |
| 1057 | static void |
| 1058 | yyerror (s) |
| 1059 | const char *s; |
| 1060 | { |
| 1061 | op->error = s; |
| 1062 | } |