1 /* Assembler interface for targets using CGEN. -*- C -*- 2 CGEN: Cpu tools GENerator 3 4 THIS FILE IS MACHINE GENERATED WITH CGEN. 5 - the resultant file is machine generated, cgen-asm.in isn't 6 7 Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2005, 2007 8 Free Software Foundation, Inc. 9 10 This file is part of libopcodes. 11 12 This library is free software; you can redistribute it and/or modify 13 it under the terms of the GNU General Public License as published by 14 the Free Software Foundation; either version 3, or (at your option) 15 any later version. 16 17 It is distributed in the hope that it will be useful, but WITHOUT 18 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 19 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 20 License for more details. 21 22 You should have received a copy of the GNU General Public License 23 along with this program; if not, write to the Free Software Foundation, Inc., 24 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 25 26 27 /* ??? Eventually more and more of this stuff can go to cpu-independent files. 28 Keep that in mind. */ 29 30 #include "sysdep.h" 31 #include <stdio.h> 32 #include "ansidecl.h" 33 #include "bfd.h" 34 #include "symcat.h" 35 #include "iq2000-desc.h" 36 #include "iq2000-opc.h" 37 #include "opintl.h" 38 #include "xregex.h" 39 #include "libiberty.h" 40 #include "safe-ctype.h" 41 42 #undef min 43 #define min(a,b) ((a) < (b) ? (a) : (b)) 44 #undef max 45 #define max(a,b) ((a) > (b) ? (a) : (b)) 46 47 static const char * parse_insn_normal 48 (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *); 49 50 /* -- assembler routines inserted here. */ 51 52 /* -- asm.c */ 53 54 #include "safe-ctype.h" 55 56 static const char * MISSING_CLOSING_PARENTHESIS = N_("missing `)'"); 57 58 /* Special check to ensure that instruction exists for given machine. */ 59 60 int 61 iq2000_cgen_insn_supported (CGEN_CPU_DESC cd, const CGEN_INSN *insn) 62 { 63 int machs = cd->machs; 64 65 return (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_MACH) & machs) != 0; 66 } 67 68 static int 69 iq2000_cgen_isa_register (const char **strp) 70 { 71 int len; 72 int ch1, ch2; 73 74 if (**strp == 'r' || **strp == 'R') 75 { 76 len = strlen (*strp); 77 if (len == 2) 78 { 79 ch1 = (*strp)[1]; 80 if ('0' <= ch1 && ch1 <= '9') 81 return 1; 82 } 83 else if (len == 3) 84 { 85 ch1 = (*strp)[1]; 86 ch2 = (*strp)[2]; 87 if (('1' <= ch1 && ch1 <= '2') && ('0' <= ch2 && ch2 <= '9')) 88 return 1; 89 if ('3' == ch1 && (ch2 == '0' || ch2 == '1')) 90 return 1; 91 } 92 } 93 if (**strp == '%' 94 && TOLOWER ((*strp)[1]) != 'l' 95 && TOLOWER ((*strp)[1]) != 'h') 96 return 1; 97 return 0; 98 } 99 100 /* Handle negated literal. */ 101 102 static const char * 103 parse_mimm (CGEN_CPU_DESC cd, 104 const char **strp, 105 int opindex, 106 unsigned long *valuep) 107 { 108 const char *errmsg; 109 110 /* Verify this isn't a register. */ 111 if (iq2000_cgen_isa_register (strp)) 112 errmsg = _("immediate value cannot be register"); 113 else 114 { 115 long value; 116 117 errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value); 118 if (errmsg == NULL) 119 { 120 long x = (-value) & 0xFFFF0000; 121 122 if (x != 0 && x != (long) 0xFFFF0000) 123 errmsg = _("immediate value out of range"); 124 else 125 *valuep = (-value & 0xFFFF); 126 } 127 } 128 return errmsg; 129 } 130 131 /* Handle signed/unsigned literal. */ 132 133 static const char * 134 parse_imm (CGEN_CPU_DESC cd, 135 const char **strp, 136 int opindex, 137 unsigned long *valuep) 138 { 139 const char *errmsg; 140 141 if (iq2000_cgen_isa_register (strp)) 142 errmsg = _("immediate value cannot be register"); 143 else 144 { 145 long value; 146 147 errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value); 148 if (errmsg == NULL) 149 { 150 long x = value & 0xFFFF0000; 151 152 if (x != 0 && x != (long) 0xFFFF0000) 153 errmsg = _("immediate value out of range"); 154 else 155 *valuep = (value & 0xFFFF); 156 } 157 } 158 return errmsg; 159 } 160 161 /* Handle iq10 21-bit jmp offset. */ 162 163 static const char * 164 parse_jtargq10 (CGEN_CPU_DESC cd, 165 const char **strp, 166 int opindex, 167 int reloc ATTRIBUTE_UNUSED, 168 enum cgen_parse_operand_result *type_addr ATTRIBUTE_UNUSED, 169 bfd_vma *valuep) 170 { 171 const char *errmsg; 172 bfd_vma value; 173 enum cgen_parse_operand_result result_type = CGEN_PARSE_OPERAND_RESULT_NUMBER; 174 175 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IQ2000_OFFSET_21, 176 & result_type, & value); 177 if (errmsg == NULL && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 178 { 179 /* Check value is within 23-bits 180 (remembering that 2-bit shift right will occur). */ 181 if (value > 0x7fffff) 182 return _("21-bit offset out of range"); 183 } 184 *valuep = (value & 0x7FFFFF); 185 return errmsg; 186 } 187 188 /* Handle high(). */ 189 190 static const char * 191 parse_hi16 (CGEN_CPU_DESC cd, 192 const char **strp, 193 int opindex, 194 unsigned long *valuep) 195 { 196 if (strncasecmp (*strp, "%hi(", 4) == 0) 197 { 198 enum cgen_parse_operand_result result_type; 199 bfd_vma value; 200 const char *errmsg; 201 202 *strp += 4; 203 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16, 204 & result_type, & value); 205 if (**strp != ')') 206 return MISSING_CLOSING_PARENTHESIS; 207 208 ++*strp; 209 if (errmsg == NULL 210 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 211 { 212 /* If value has top-bit of %lo on, then it will 213 sign-propagate and so we compensate by adding 214 1 to the resultant %hi value. */ 215 if (value & 0x8000) 216 value += 0x10000; 217 value >>= 16; 218 value &= 0xffff; 219 } 220 *valuep = value; 221 222 return errmsg; 223 } 224 225 /* We add %uhi in case a user just wants the high 16-bits or is using 226 an insn like ori for %lo which does not sign-propagate. */ 227 if (strncasecmp (*strp, "%uhi(", 5) == 0) 228 { 229 enum cgen_parse_operand_result result_type; 230 bfd_vma value; 231 const char *errmsg; 232 233 *strp += 5; 234 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IQ2000_UHI16, 235 & result_type, & value); 236 if (**strp != ')') 237 return MISSING_CLOSING_PARENTHESIS; 238 239 ++*strp; 240 if (errmsg == NULL 241 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 242 value >>= 16; 243 244 value &= 0xffff; 245 *valuep = value; 246 247 return errmsg; 248 } 249 250 return parse_imm (cd, strp, opindex, valuep); 251 } 252 253 /* Handle %lo in a signed context. 254 The signedness of the value doesn't matter to %lo(), but this also 255 handles the case where %lo() isn't present. */ 256 257 static const char * 258 parse_lo16 (CGEN_CPU_DESC cd, 259 const char **strp, 260 int opindex, 261 unsigned long *valuep) 262 { 263 if (strncasecmp (*strp, "%lo(", 4) == 0) 264 { 265 const char *errmsg; 266 enum cgen_parse_operand_result result_type; 267 bfd_vma value; 268 269 *strp += 4; 270 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16, 271 & result_type, & value); 272 if (**strp != ')') 273 return MISSING_CLOSING_PARENTHESIS; 274 ++*strp; 275 if (errmsg == NULL 276 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 277 value &= 0xffff; 278 *valuep = value; 279 return errmsg; 280 } 281 282 return parse_imm (cd, strp, opindex, valuep); 283 } 284 285 /* Handle %lo in a negated signed context. 286 The signedness of the value doesn't matter to %lo(), but this also 287 handles the case where %lo() isn't present. */ 288 289 static const char * 290 parse_mlo16 (CGEN_CPU_DESC cd, 291 const char **strp, 292 int opindex, 293 unsigned long *valuep) 294 { 295 if (strncasecmp (*strp, "%lo(", 4) == 0) 296 { 297 const char *errmsg; 298 enum cgen_parse_operand_result result_type; 299 bfd_vma value; 300 301 *strp += 4; 302 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16, 303 & result_type, & value); 304 if (**strp != ')') 305 return MISSING_CLOSING_PARENTHESIS; 306 ++*strp; 307 if (errmsg == NULL 308 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 309 value = (-value) & 0xffff; 310 *valuep = value; 311 return errmsg; 312 } 313 314 return parse_mimm (cd, strp, opindex, valuep); 315 } 316 317 /* -- */ 318 319 const char * iq2000_cgen_parse_operand 320 (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *); 321 322 /* Main entry point for operand parsing. 323 324 This function is basically just a big switch statement. Earlier versions 325 used tables to look up the function to use, but 326 - if the table contains both assembler and disassembler functions then 327 the disassembler contains much of the assembler and vice-versa, 328 - there's a lot of inlining possibilities as things grow, 329 - using a switch statement avoids the function call overhead. 330 331 This function could be moved into `parse_insn_normal', but keeping it 332 separate makes clear the interface between `parse_insn_normal' and each of 333 the handlers. */ 334 335 const char * 336 iq2000_cgen_parse_operand (CGEN_CPU_DESC cd, 337 int opindex, 338 const char ** strp, 339 CGEN_FIELDS * fields) 340 { 341 const char * errmsg = NULL; 342 /* Used by scalar operands that still need to be parsed. */ 343 long junk ATTRIBUTE_UNUSED; 344 345 switch (opindex) 346 { 347 case IQ2000_OPERAND__INDEX : 348 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND__INDEX, (unsigned long *) (& fields->f_index)); 349 break; 350 case IQ2000_OPERAND_BASE : 351 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rs); 352 break; 353 case IQ2000_OPERAND_BASEOFF : 354 { 355 bfd_vma value = 0; 356 errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_BASEOFF, 0, NULL, & value); 357 fields->f_imm = value; 358 } 359 break; 360 case IQ2000_OPERAND_BITNUM : 361 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_BITNUM, (unsigned long *) (& fields->f_rt)); 362 break; 363 case IQ2000_OPERAND_BYTECOUNT : 364 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_BYTECOUNT, (unsigned long *) (& fields->f_bytecount)); 365 break; 366 case IQ2000_OPERAND_CAM_Y : 367 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CAM_Y, (unsigned long *) (& fields->f_cam_y)); 368 break; 369 case IQ2000_OPERAND_CAM_Z : 370 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CAM_Z, (unsigned long *) (& fields->f_cam_z)); 371 break; 372 case IQ2000_OPERAND_CM_3FUNC : 373 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_3FUNC, (unsigned long *) (& fields->f_cm_3func)); 374 break; 375 case IQ2000_OPERAND_CM_3Z : 376 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_3Z, (unsigned long *) (& fields->f_cm_3z)); 377 break; 378 case IQ2000_OPERAND_CM_4FUNC : 379 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_4FUNC, (unsigned long *) (& fields->f_cm_4func)); 380 break; 381 case IQ2000_OPERAND_CM_4Z : 382 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_4Z, (unsigned long *) (& fields->f_cm_4z)); 383 break; 384 case IQ2000_OPERAND_COUNT : 385 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_COUNT, (unsigned long *) (& fields->f_count)); 386 break; 387 case IQ2000_OPERAND_EXECODE : 388 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_EXECODE, (unsigned long *) (& fields->f_excode)); 389 break; 390 case IQ2000_OPERAND_HI16 : 391 errmsg = parse_hi16 (cd, strp, IQ2000_OPERAND_HI16, (unsigned long *) (& fields->f_imm)); 392 break; 393 case IQ2000_OPERAND_IMM : 394 errmsg = parse_imm (cd, strp, IQ2000_OPERAND_IMM, (unsigned long *) (& fields->f_imm)); 395 break; 396 case IQ2000_OPERAND_JMPTARG : 397 { 398 bfd_vma value = 0; 399 errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_JMPTARG, 0, NULL, & value); 400 fields->f_jtarg = value; 401 } 402 break; 403 case IQ2000_OPERAND_JMPTARGQ10 : 404 { 405 bfd_vma value = 0; 406 errmsg = parse_jtargq10 (cd, strp, IQ2000_OPERAND_JMPTARGQ10, 0, NULL, & value); 407 fields->f_jtargq10 = value; 408 } 409 break; 410 case IQ2000_OPERAND_LO16 : 411 errmsg = parse_lo16 (cd, strp, IQ2000_OPERAND_LO16, (unsigned long *) (& fields->f_imm)); 412 break; 413 case IQ2000_OPERAND_MASK : 414 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASK, (unsigned long *) (& fields->f_mask)); 415 break; 416 case IQ2000_OPERAND_MASKL : 417 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKL, (unsigned long *) (& fields->f_maskl)); 418 break; 419 case IQ2000_OPERAND_MASKQ10 : 420 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKQ10, (unsigned long *) (& fields->f_maskq10)); 421 break; 422 case IQ2000_OPERAND_MASKR : 423 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKR, (unsigned long *) (& fields->f_rs)); 424 break; 425 case IQ2000_OPERAND_MLO16 : 426 errmsg = parse_mlo16 (cd, strp, IQ2000_OPERAND_MLO16, (unsigned long *) (& fields->f_imm)); 427 break; 428 case IQ2000_OPERAND_OFFSET : 429 { 430 bfd_vma value = 0; 431 errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_OFFSET, 0, NULL, & value); 432 fields->f_offset = value; 433 } 434 break; 435 case IQ2000_OPERAND_RD : 436 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd); 437 break; 438 case IQ2000_OPERAND_RD_RS : 439 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd_rs); 440 break; 441 case IQ2000_OPERAND_RD_RT : 442 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd_rt); 443 break; 444 case IQ2000_OPERAND_RS : 445 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rs); 446 break; 447 case IQ2000_OPERAND_RT : 448 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rt); 449 break; 450 case IQ2000_OPERAND_RT_RS : 451 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rt_rs); 452 break; 453 case IQ2000_OPERAND_SHAMT : 454 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_SHAMT, (unsigned long *) (& fields->f_shamt)); 455 break; 456 457 default : 458 /* xgettext:c-format */ 459 fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex); 460 abort (); 461 } 462 463 return errmsg; 464 } 465 466 cgen_parse_fn * const iq2000_cgen_parse_handlers[] = 467 { 468 parse_insn_normal, 469 }; 470 471 void 472 iq2000_cgen_init_asm (CGEN_CPU_DESC cd) 473 { 474 iq2000_cgen_init_opcode_table (cd); 475 iq2000_cgen_init_ibld_table (cd); 476 cd->parse_handlers = & iq2000_cgen_parse_handlers[0]; 477 cd->parse_operand = iq2000_cgen_parse_operand; 478 #ifdef CGEN_ASM_INIT_HOOK 479 CGEN_ASM_INIT_HOOK 480 #endif 481 } 482 483 484 485 /* Regex construction routine. 486 487 This translates an opcode syntax string into a regex string, 488 by replacing any non-character syntax element (such as an 489 opcode) with the pattern '.*' 490 491 It then compiles the regex and stores it in the opcode, for 492 later use by iq2000_cgen_assemble_insn 493 494 Returns NULL for success, an error message for failure. */ 495 496 char * 497 iq2000_cgen_build_insn_regex (CGEN_INSN *insn) 498 { 499 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn); 500 const char *mnem = CGEN_INSN_MNEMONIC (insn); 501 char rxbuf[CGEN_MAX_RX_ELEMENTS]; 502 char *rx = rxbuf; 503 const CGEN_SYNTAX_CHAR_TYPE *syn; 504 int reg_err; 505 506 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc)); 507 508 /* Mnemonics come first in the syntax string. */ 509 if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) 510 return _("missing mnemonic in syntax string"); 511 ++syn; 512 513 /* Generate a case sensitive regular expression that emulates case 514 insensitive matching in the "C" locale. We cannot generate a case 515 insensitive regular expression because in Turkish locales, 'i' and 'I' 516 are not equal modulo case conversion. */ 517 518 /* Copy the literal mnemonic out of the insn. */ 519 for (; *mnem; mnem++) 520 { 521 char c = *mnem; 522 523 if (ISALPHA (c)) 524 { 525 *rx++ = '['; 526 *rx++ = TOLOWER (c); 527 *rx++ = TOUPPER (c); 528 *rx++ = ']'; 529 } 530 else 531 *rx++ = c; 532 } 533 534 /* Copy any remaining literals from the syntax string into the rx. */ 535 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn) 536 { 537 if (CGEN_SYNTAX_CHAR_P (* syn)) 538 { 539 char c = CGEN_SYNTAX_CHAR (* syn); 540 541 switch (c) 542 { 543 /* Escape any regex metacharacters in the syntax. */ 544 case '.': case '[': case '\\': 545 case '*': case '^': case '$': 546 547 #ifdef CGEN_ESCAPE_EXTENDED_REGEX 548 case '?': case '{': case '}': 549 case '(': case ')': case '*': 550 case '|': case '+': case ']': 551 #endif 552 *rx++ = '\\'; 553 *rx++ = c; 554 break; 555 556 default: 557 if (ISALPHA (c)) 558 { 559 *rx++ = '['; 560 *rx++ = TOLOWER (c); 561 *rx++ = TOUPPER (c); 562 *rx++ = ']'; 563 } 564 else 565 *rx++ = c; 566 break; 567 } 568 } 569 else 570 { 571 /* Replace non-syntax fields with globs. */ 572 *rx++ = '.'; 573 *rx++ = '*'; 574 } 575 } 576 577 /* Trailing whitespace ok. */ 578 * rx++ = '['; 579 * rx++ = ' '; 580 * rx++ = '\t'; 581 * rx++ = ']'; 582 * rx++ = '*'; 583 584 /* But anchor it after that. */ 585 * rx++ = '$'; 586 * rx = '\0'; 587 588 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t)); 589 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB); 590 591 if (reg_err == 0) 592 return NULL; 593 else 594 { 595 static char msg[80]; 596 597 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80); 598 regfree ((regex_t *) CGEN_INSN_RX (insn)); 599 free (CGEN_INSN_RX (insn)); 600 (CGEN_INSN_RX (insn)) = NULL; 601 return msg; 602 } 603 } 604 605 606 /* Default insn parser. 607 608 The syntax string is scanned and operands are parsed and stored in FIELDS. 609 Relocs are queued as we go via other callbacks. 610 611 ??? Note that this is currently an all-or-nothing parser. If we fail to 612 parse the instruction, we return 0 and the caller will start over from 613 the beginning. Backtracking will be necessary in parsing subexpressions, 614 but that can be handled there. Not handling backtracking here may get 615 expensive in the case of the m68k. Deal with later. 616 617 Returns NULL for success, an error message for failure. */ 618 619 static const char * 620 parse_insn_normal (CGEN_CPU_DESC cd, 621 const CGEN_INSN *insn, 622 const char **strp, 623 CGEN_FIELDS *fields) 624 { 625 /* ??? Runtime added insns not handled yet. */ 626 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn); 627 const char *str = *strp; 628 const char *errmsg; 629 const char *p; 630 const CGEN_SYNTAX_CHAR_TYPE * syn; 631 #ifdef CGEN_MNEMONIC_OPERANDS 632 /* FIXME: wip */ 633 int past_opcode_p; 634 #endif 635 636 /* For now we assume the mnemonic is first (there are no leading operands). 637 We can parse it without needing to set up operand parsing. 638 GAS's input scrubber will ensure mnemonics are lowercase, but we may 639 not be called from GAS. */ 640 p = CGEN_INSN_MNEMONIC (insn); 641 while (*p && TOLOWER (*p) == TOLOWER (*str)) 642 ++p, ++str; 643 644 if (* p) 645 return _("unrecognized instruction"); 646 647 #ifndef CGEN_MNEMONIC_OPERANDS 648 if (* str && ! ISSPACE (* str)) 649 return _("unrecognized instruction"); 650 #endif 651 652 CGEN_INIT_PARSE (cd); 653 cgen_init_parse_operand (cd); 654 #ifdef CGEN_MNEMONIC_OPERANDS 655 past_opcode_p = 0; 656 #endif 657 658 /* We don't check for (*str != '\0') here because we want to parse 659 any trailing fake arguments in the syntax string. */ 660 syn = CGEN_SYNTAX_STRING (syntax); 661 662 /* Mnemonics come first for now, ensure valid string. */ 663 if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) 664 abort (); 665 666 ++syn; 667 668 while (* syn != 0) 669 { 670 /* Non operand chars must match exactly. */ 671 if (CGEN_SYNTAX_CHAR_P (* syn)) 672 { 673 /* FIXME: While we allow for non-GAS callers above, we assume the 674 first char after the mnemonic part is a space. */ 675 /* FIXME: We also take inappropriate advantage of the fact that 676 GAS's input scrubber will remove extraneous blanks. */ 677 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn))) 678 { 679 #ifdef CGEN_MNEMONIC_OPERANDS 680 if (CGEN_SYNTAX_CHAR(* syn) == ' ') 681 past_opcode_p = 1; 682 #endif 683 ++ syn; 684 ++ str; 685 } 686 else if (*str) 687 { 688 /* Syntax char didn't match. Can't be this insn. */ 689 static char msg [80]; 690 691 /* xgettext:c-format */ 692 sprintf (msg, _("syntax error (expected char `%c', found `%c')"), 693 CGEN_SYNTAX_CHAR(*syn), *str); 694 return msg; 695 } 696 else 697 { 698 /* Ran out of input. */ 699 static char msg [80]; 700 701 /* xgettext:c-format */ 702 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"), 703 CGEN_SYNTAX_CHAR(*syn)); 704 return msg; 705 } 706 continue; 707 } 708 709 /* We have an operand of some sort. */ 710 errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), 711 &str, fields); 712 if (errmsg) 713 return errmsg; 714 715 /* Done with this operand, continue with next one. */ 716 ++ syn; 717 } 718 719 /* If we're at the end of the syntax string, we're done. */ 720 if (* syn == 0) 721 { 722 /* FIXME: For the moment we assume a valid `str' can only contain 723 blanks now. IE: We needn't try again with a longer version of 724 the insn and it is assumed that longer versions of insns appear 725 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */ 726 while (ISSPACE (* str)) 727 ++ str; 728 729 if (* str != '\0') 730 return _("junk at end of line"); /* FIXME: would like to include `str' */ 731 732 return NULL; 733 } 734 735 /* We couldn't parse it. */ 736 return _("unrecognized instruction"); 737 } 738 739 /* Main entry point. 740 This routine is called for each instruction to be assembled. 741 STR points to the insn to be assembled. 742 We assume all necessary tables have been initialized. 743 The assembled instruction, less any fixups, is stored in BUF. 744 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value 745 still needs to be converted to target byte order, otherwise BUF is an array 746 of bytes in target byte order. 747 The result is a pointer to the insn's entry in the opcode table, 748 or NULL if an error occured (an error message will have already been 749 printed). 750 751 Note that when processing (non-alias) macro-insns, 752 this function recurses. 753 754 ??? It's possible to make this cpu-independent. 755 One would have to deal with a few minor things. 756 At this point in time doing so would be more of a curiosity than useful 757 [for example this file isn't _that_ big], but keeping the possibility in 758 mind helps keep the design clean. */ 759 760 const CGEN_INSN * 761 iq2000_cgen_assemble_insn (CGEN_CPU_DESC cd, 762 const char *str, 763 CGEN_FIELDS *fields, 764 CGEN_INSN_BYTES_PTR buf, 765 char **errmsg) 766 { 767 const char *start; 768 CGEN_INSN_LIST *ilist; 769 const char *parse_errmsg = NULL; 770 const char *insert_errmsg = NULL; 771 int recognized_mnemonic = 0; 772 773 /* Skip leading white space. */ 774 while (ISSPACE (* str)) 775 ++ str; 776 777 /* The instructions are stored in hashed lists. 778 Get the first in the list. */ 779 ilist = CGEN_ASM_LOOKUP_INSN (cd, str); 780 781 /* Keep looking until we find a match. */ 782 start = str; 783 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist)) 784 { 785 const CGEN_INSN *insn = ilist->insn; 786 recognized_mnemonic = 1; 787 788 #ifdef CGEN_VALIDATE_INSN_SUPPORTED 789 /* Not usually needed as unsupported opcodes 790 shouldn't be in the hash lists. */ 791 /* Is this insn supported by the selected cpu? */ 792 if (! iq2000_cgen_insn_supported (cd, insn)) 793 continue; 794 #endif 795 /* If the RELAXED attribute is set, this is an insn that shouldn't be 796 chosen immediately. Instead, it is used during assembler/linker 797 relaxation if possible. */ 798 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0) 799 continue; 800 801 str = start; 802 803 /* Skip this insn if str doesn't look right lexically. */ 804 if (CGEN_INSN_RX (insn) != NULL && 805 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH) 806 continue; 807 808 /* Allow parse/insert handlers to obtain length of insn. */ 809 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn); 810 811 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields); 812 if (parse_errmsg != NULL) 813 continue; 814 815 /* ??? 0 is passed for `pc'. */ 816 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf, 817 (bfd_vma) 0); 818 if (insert_errmsg != NULL) 819 continue; 820 821 /* It is up to the caller to actually output the insn and any 822 queued relocs. */ 823 return insn; 824 } 825 826 { 827 static char errbuf[150]; 828 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS 829 const char *tmp_errmsg; 830 831 /* If requesting verbose error messages, use insert_errmsg. 832 Failing that, use parse_errmsg. */ 833 tmp_errmsg = (insert_errmsg ? insert_errmsg : 834 parse_errmsg ? parse_errmsg : 835 recognized_mnemonic ? 836 _("unrecognized form of instruction") : 837 _("unrecognized instruction")); 838 839 if (strlen (start) > 50) 840 /* xgettext:c-format */ 841 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start); 842 else 843 /* xgettext:c-format */ 844 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start); 845 #else 846 if (strlen (start) > 50) 847 /* xgettext:c-format */ 848 sprintf (errbuf, _("bad instruction `%.50s...'"), start); 849 else 850 /* xgettext:c-format */ 851 sprintf (errbuf, _("bad instruction `%.50s'"), start); 852 #endif 853 854 *errmsg = errbuf; 855 return NULL; 856 } 857 } 858