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 (C) 1996-2017 Free Software Foundation, Inc. 8 9 This file is part of libopcodes. 10 11 This library is free software; you can redistribute it and/or modify 12 it under the terms of the GNU General Public License as published by 13 the Free Software Foundation; either version 3, or (at your option) 14 any later version. 15 16 It is distributed in the hope that it will be useful, but WITHOUT 17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 18 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 19 License for more details. 20 21 You should have received a copy of the GNU General Public License 22 along with this program; if not, write to the Free Software Foundation, Inc., 23 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 24 25 26/* ??? Eventually more and more of this stuff can go to cpu-independent files. 27 Keep that in mind. */ 28 29#include "sysdep.h" 30#include <stdio.h> 31#include "ansidecl.h" 32#include "bfd.h" 33#include "symcat.h" 34#include "ip2k-desc.h" 35#include "ip2k-opc.h" 36#include "opintl.h" 37#include "xregex.h" 38#include "libiberty.h" 39#include "safe-ctype.h" 40 41#undef min 42#define min(a,b) ((a) < (b) ? (a) : (b)) 43#undef max 44#define max(a,b) ((a) > (b) ? (a) : (b)) 45 46static const char * parse_insn_normal 47 (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *); 48 49/* -- assembler routines inserted here. */ 50 51/* -- asm.c */ 52 53static const char * 54parse_fr (CGEN_CPU_DESC cd, 55 const char **strp, 56 int opindex, 57 unsigned long *valuep) 58{ 59 const char *errmsg; 60 const char *old_strp; 61 char *afteroffset; 62 enum cgen_parse_operand_result result_type; 63 bfd_vma value; 64 extern CGEN_KEYWORD ip2k_cgen_opval_register_names; 65 bfd_vma tempvalue; 66 67 old_strp = *strp; 68 afteroffset = NULL; 69 70 /* Check here to see if you're about to try parsing a w as the first arg 71 and return an error if you are. */ 72 if ((strncmp (*strp, "w", 1) == 0) || (strncmp (*strp, "W", 1) == 0)) 73 { 74 (*strp)++; 75 76 if ((strncmp (*strp, ",", 1) == 0) || ISSPACE (**strp)) 77 { 78 /* We've been passed a w. Return with an error message so that 79 cgen will try the next parsing option. */ 80 errmsg = _("W keyword invalid in FR operand slot."); 81 return errmsg; 82 } 83 *strp = old_strp; 84 } 85 86 /* Attempt parse as register keyword. */ 87 errmsg = cgen_parse_keyword (cd, strp, & ip2k_cgen_opval_register_names, 88 (long *) valuep); 89 if (*strp != NULL 90 && errmsg == NULL) 91 return errmsg; 92 93 /* Attempt to parse for "(IP)". */ 94 afteroffset = strstr (*strp, "(IP)"); 95 96 if (afteroffset == NULL) 97 /* Make sure it's not in lower case. */ 98 afteroffset = strstr (*strp, "(ip)"); 99 100 if (afteroffset != NULL) 101 { 102 if (afteroffset != *strp) 103 { 104 /* Invalid offset present. */ 105 errmsg = _("offset(IP) is not a valid form"); 106 return errmsg; 107 } 108 else 109 { 110 *strp += 4; 111 *valuep = 0; 112 errmsg = NULL; 113 return errmsg; 114 } 115 } 116 117 /* Attempt to parse for DP. ex: mov w, offset(DP) 118 mov offset(DP),w */ 119 120 /* Try parsing it as an address and see what comes back. */ 121 afteroffset = strstr (*strp, "(DP)"); 122 123 if (afteroffset == NULL) 124 /* Maybe it's in lower case. */ 125 afteroffset = strstr (*strp, "(dp)"); 126 127 if (afteroffset != NULL) 128 { 129 if (afteroffset == *strp) 130 { 131 /* No offset present. Use 0 by default. */ 132 tempvalue = 0; 133 errmsg = NULL; 134 } 135 else 136 errmsg = cgen_parse_address (cd, strp, opindex, 137 BFD_RELOC_IP2K_FR_OFFSET, 138 & result_type, & tempvalue); 139 140 if (errmsg == NULL) 141 { 142 if (tempvalue <= 127) 143 { 144 /* Value is ok. Fix up the first 2 bits and return. */ 145 *valuep = 0x0100 | tempvalue; 146 *strp += 4; /* Skip over the (DP) in *strp. */ 147 return errmsg; 148 } 149 else 150 { 151 /* Found something there in front of (DP) but it's out 152 of range. */ 153 errmsg = _("(DP) offset out of range."); 154 return errmsg; 155 } 156 } 157 } 158 159 160 /* Attempt to parse for SP. ex: mov w, offset(SP) 161 mov offset(SP), w. */ 162 afteroffset = strstr (*strp, "(SP)"); 163 164 if (afteroffset == NULL) 165 /* Maybe it's in lower case. */ 166 afteroffset = strstr (*strp, "(sp)"); 167 168 if (afteroffset != NULL) 169 { 170 if (afteroffset == *strp) 171 { 172 /* No offset present. Use 0 by default. */ 173 tempvalue = 0; 174 errmsg = NULL; 175 } 176 else 177 errmsg = cgen_parse_address (cd, strp, opindex, 178 BFD_RELOC_IP2K_FR_OFFSET, 179 & result_type, & tempvalue); 180 181 if (errmsg == NULL) 182 { 183 if (tempvalue <= 127) 184 { 185 /* Value is ok. Fix up the first 2 bits and return. */ 186 *valuep = 0x0180 | tempvalue; 187 *strp += 4; /* Skip over the (SP) in *strp. */ 188 return errmsg; 189 } 190 else 191 { 192 /* Found something there in front of (SP) but it's out 193 of range. */ 194 errmsg = _("(SP) offset out of range."); 195 return errmsg; 196 } 197 } 198 } 199 200 /* Attempt to parse as an address. */ 201 *strp = old_strp; 202 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IP2K_FR9, 203 & result_type, & value); 204 if (errmsg == NULL) 205 { 206 *valuep = value; 207 208 /* If a parenthesis is found, warn about invalid form. */ 209 if (**strp == '(') 210 errmsg = _("illegal use of parentheses"); 211 212 /* If a numeric value is specified, ensure that it is between 213 1 and 255. */ 214 else if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 215 { 216 if (value < 0x1 || value > 0xff) 217 errmsg = _("operand out of range (not between 1 and 255)"); 218 } 219 } 220 return errmsg; 221} 222 223static const char * 224parse_addr16 (CGEN_CPU_DESC cd, 225 const char **strp, 226 int opindex, 227 unsigned long *valuep) 228{ 229 const char *errmsg; 230 enum cgen_parse_operand_result result_type; 231 bfd_reloc_code_real_type code = BFD_RELOC_NONE; 232 bfd_vma value; 233 234 if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16H) 235 code = BFD_RELOC_IP2K_HI8DATA; 236 else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16L) 237 code = BFD_RELOC_IP2K_LO8DATA; 238 else 239 { 240 /* Something is very wrong. opindex has to be one of the above. */ 241 errmsg = _("parse_addr16: invalid opindex."); 242 return errmsg; 243 } 244 245 errmsg = cgen_parse_address (cd, strp, opindex, code, 246 & result_type, & value); 247 if (errmsg == NULL) 248 { 249 /* We either have a relocation or a number now. */ 250 if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 251 { 252 /* We got a number back. */ 253 if (code == BFD_RELOC_IP2K_HI8DATA) 254 value >>= 8; 255 else 256 /* code = BFD_RELOC_IP2K_LOW8DATA. */ 257 value &= 0x00FF; 258 } 259 *valuep = value; 260 } 261 262 return errmsg; 263} 264 265static const char * 266parse_addr16_cjp (CGEN_CPU_DESC cd, 267 const char **strp, 268 int opindex, 269 unsigned long *valuep) 270{ 271 const char *errmsg; 272 enum cgen_parse_operand_result result_type; 273 bfd_reloc_code_real_type code = BFD_RELOC_NONE; 274 bfd_vma value; 275 276 if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16CJP) 277 code = BFD_RELOC_IP2K_ADDR16CJP; 278 else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16P) 279 code = BFD_RELOC_IP2K_PAGE3; 280 281 errmsg = cgen_parse_address (cd, strp, opindex, code, 282 & result_type, & value); 283 if (errmsg == NULL) 284 { 285 if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 286 { 287 if ((value & 0x1) == 0) /* If the address is even .... */ 288 { 289 if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16CJP) 290 *valuep = (value >> 1) & 0x1FFF; /* Should mask be 1FFF? */ 291 else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16P) 292 *valuep = (value >> 14) & 0x7; 293 } 294 else 295 errmsg = _("Byte address required. - must be even."); 296 } 297 else if (result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED) 298 { 299 /* This will happen for things like (s2-s1) where s2 and s1 300 are labels. */ 301 *valuep = value; 302 } 303 else 304 errmsg = _("cgen_parse_address returned a symbol. Literal required."); 305 } 306 return errmsg; 307} 308 309static const char * 310parse_lit8 (CGEN_CPU_DESC cd, 311 const char **strp, 312 int opindex, 313 long *valuep) 314{ 315 const char *errmsg; 316 enum cgen_parse_operand_result result_type; 317 bfd_reloc_code_real_type code = BFD_RELOC_NONE; 318 bfd_vma value; 319 320 /* Parse %OP relocating operators. */ 321 if (strncmp (*strp, "%bank", 5) == 0) 322 { 323 *strp += 5; 324 code = BFD_RELOC_IP2K_BANK; 325 } 326 else if (strncmp (*strp, "%lo8data", 8) == 0) 327 { 328 *strp += 8; 329 code = BFD_RELOC_IP2K_LO8DATA; 330 } 331 else if (strncmp (*strp, "%hi8data", 8) == 0) 332 { 333 *strp += 8; 334 code = BFD_RELOC_IP2K_HI8DATA; 335 } 336 else if (strncmp (*strp, "%ex8data", 8) == 0) 337 { 338 *strp += 8; 339 code = BFD_RELOC_IP2K_EX8DATA; 340 } 341 else if (strncmp (*strp, "%lo8insn", 8) == 0) 342 { 343 *strp += 8; 344 code = BFD_RELOC_IP2K_LO8INSN; 345 } 346 else if (strncmp (*strp, "%hi8insn", 8) == 0) 347 { 348 *strp += 8; 349 code = BFD_RELOC_IP2K_HI8INSN; 350 } 351 352 /* Parse %op operand. */ 353 if (code != BFD_RELOC_NONE) 354 { 355 errmsg = cgen_parse_address (cd, strp, opindex, code, 356 & result_type, & value); 357 if ((errmsg == NULL) && 358 (result_type != CGEN_PARSE_OPERAND_RESULT_QUEUED)) 359 errmsg = _("percent-operator operand is not a symbol"); 360 361 *valuep = value; 362 } 363 /* Parse as a number. */ 364 else 365 { 366 errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep); 367 368 /* Truncate to eight bits to accept both signed and unsigned input. */ 369 if (errmsg == NULL) 370 *valuep &= 0xFF; 371 } 372 373 return errmsg; 374} 375 376static const char * 377parse_bit3 (CGEN_CPU_DESC cd, 378 const char **strp, 379 int opindex, 380 unsigned long *valuep) 381{ 382 const char *errmsg; 383 char mode = 0; 384 long count = 0; 385 unsigned long value; 386 387 if (strncmp (*strp, "%bit", 4) == 0) 388 { 389 *strp += 4; 390 mode = 1; 391 } 392 else if (strncmp (*strp, "%msbbit", 7) == 0) 393 { 394 *strp += 7; 395 mode = 1; 396 } 397 else if (strncmp (*strp, "%lsbbit", 7) == 0) 398 { 399 *strp += 7; 400 mode = 2; 401 } 402 403 errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, valuep); 404 if (errmsg) 405 return errmsg; 406 407 if (mode) 408 { 409 value = * valuep; 410 if (value == 0) 411 { 412 errmsg = _("Attempt to find bit index of 0"); 413 return errmsg; 414 } 415 416 if (mode == 1) 417 { 418 count = 31; 419 while ((value & 0x80000000) == 0) 420 { 421 count--; 422 value <<= 1; 423 } 424 } 425 else if (mode == 2) 426 { 427 count = 0; 428 while ((value & 0x00000001) == 0) 429 { 430 count++; 431 value >>= 1; 432 } 433 } 434 435 *valuep = count; 436 } 437 438 return errmsg; 439} 440 441/* -- dis.c */ 442 443const char * ip2k_cgen_parse_operand 444 (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *); 445 446/* Main entry point for operand parsing. 447 448 This function is basically just a big switch statement. Earlier versions 449 used tables to look up the function to use, but 450 - if the table contains both assembler and disassembler functions then 451 the disassembler contains much of the assembler and vice-versa, 452 - there's a lot of inlining possibilities as things grow, 453 - using a switch statement avoids the function call overhead. 454 455 This function could be moved into `parse_insn_normal', but keeping it 456 separate makes clear the interface between `parse_insn_normal' and each of 457 the handlers. */ 458 459const char * 460ip2k_cgen_parse_operand (CGEN_CPU_DESC cd, 461 int opindex, 462 const char ** strp, 463 CGEN_FIELDS * fields) 464{ 465 const char * errmsg = NULL; 466 /* Used by scalar operands that still need to be parsed. */ 467 long junk ATTRIBUTE_UNUSED; 468 469 switch (opindex) 470 { 471 case IP2K_OPERAND_ADDR16CJP : 472 errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16CJP, (unsigned long *) (& fields->f_addr16cjp)); 473 break; 474 case IP2K_OPERAND_ADDR16H : 475 errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16H, (unsigned long *) (& fields->f_imm8)); 476 break; 477 case IP2K_OPERAND_ADDR16L : 478 errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16L, (unsigned long *) (& fields->f_imm8)); 479 break; 480 case IP2K_OPERAND_ADDR16P : 481 errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16P, (unsigned long *) (& fields->f_page3)); 482 break; 483 case IP2K_OPERAND_BITNO : 484 errmsg = parse_bit3 (cd, strp, IP2K_OPERAND_BITNO, (unsigned long *) (& fields->f_bitno)); 485 break; 486 case IP2K_OPERAND_CBIT : 487 errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_CBIT, (unsigned long *) (& junk)); 488 break; 489 case IP2K_OPERAND_DCBIT : 490 errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_DCBIT, (unsigned long *) (& junk)); 491 break; 492 case IP2K_OPERAND_FR : 493 errmsg = parse_fr (cd, strp, IP2K_OPERAND_FR, (unsigned long *) (& fields->f_reg)); 494 break; 495 case IP2K_OPERAND_LIT8 : 496 errmsg = parse_lit8 (cd, strp, IP2K_OPERAND_LIT8, (long *) (& fields->f_imm8)); 497 break; 498 case IP2K_OPERAND_PABITS : 499 errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_PABITS, (unsigned long *) (& junk)); 500 break; 501 case IP2K_OPERAND_RETI3 : 502 errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_RETI3, (unsigned long *) (& fields->f_reti3)); 503 break; 504 case IP2K_OPERAND_ZBIT : 505 errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_ZBIT, (unsigned long *) (& junk)); 506 break; 507 508 default : 509 /* xgettext:c-format */ 510 fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex); 511 abort (); 512 } 513 514 return errmsg; 515} 516 517cgen_parse_fn * const ip2k_cgen_parse_handlers[] = 518{ 519 parse_insn_normal, 520}; 521 522void 523ip2k_cgen_init_asm (CGEN_CPU_DESC cd) 524{ 525 ip2k_cgen_init_opcode_table (cd); 526 ip2k_cgen_init_ibld_table (cd); 527 cd->parse_handlers = & ip2k_cgen_parse_handlers[0]; 528 cd->parse_operand = ip2k_cgen_parse_operand; 529#ifdef CGEN_ASM_INIT_HOOK 530CGEN_ASM_INIT_HOOK 531#endif 532} 533 534 535 536/* Regex construction routine. 537 538 This translates an opcode syntax string into a regex string, 539 by replacing any non-character syntax element (such as an 540 opcode) with the pattern '.*' 541 542 It then compiles the regex and stores it in the opcode, for 543 later use by ip2k_cgen_assemble_insn 544 545 Returns NULL for success, an error message for failure. */ 546 547char * 548ip2k_cgen_build_insn_regex (CGEN_INSN *insn) 549{ 550 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn); 551 const char *mnem = CGEN_INSN_MNEMONIC (insn); 552 char rxbuf[CGEN_MAX_RX_ELEMENTS]; 553 char *rx = rxbuf; 554 const CGEN_SYNTAX_CHAR_TYPE *syn; 555 int reg_err; 556 557 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc)); 558 559 /* Mnemonics come first in the syntax string. */ 560 if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) 561 return _("missing mnemonic in syntax string"); 562 ++syn; 563 564 /* Generate a case sensitive regular expression that emulates case 565 insensitive matching in the "C" locale. We cannot generate a case 566 insensitive regular expression because in Turkish locales, 'i' and 'I' 567 are not equal modulo case conversion. */ 568 569 /* Copy the literal mnemonic out of the insn. */ 570 for (; *mnem; mnem++) 571 { 572 char c = *mnem; 573 574 if (ISALPHA (c)) 575 { 576 *rx++ = '['; 577 *rx++ = TOLOWER (c); 578 *rx++ = TOUPPER (c); 579 *rx++ = ']'; 580 } 581 else 582 *rx++ = c; 583 } 584 585 /* Copy any remaining literals from the syntax string into the rx. */ 586 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn) 587 { 588 if (CGEN_SYNTAX_CHAR_P (* syn)) 589 { 590 char c = CGEN_SYNTAX_CHAR (* syn); 591 592 switch (c) 593 { 594 /* Escape any regex metacharacters in the syntax. */ 595 case '.': case '[': case '\\': 596 case '*': case '^': case '$': 597 598#ifdef CGEN_ESCAPE_EXTENDED_REGEX 599 case '?': case '{': case '}': 600 case '(': case ')': case '*': 601 case '|': case '+': case ']': 602#endif 603 *rx++ = '\\'; 604 *rx++ = c; 605 break; 606 607 default: 608 if (ISALPHA (c)) 609 { 610 *rx++ = '['; 611 *rx++ = TOLOWER (c); 612 *rx++ = TOUPPER (c); 613 *rx++ = ']'; 614 } 615 else 616 *rx++ = c; 617 break; 618 } 619 } 620 else 621 { 622 /* Replace non-syntax fields with globs. */ 623 *rx++ = '.'; 624 *rx++ = '*'; 625 } 626 } 627 628 /* Trailing whitespace ok. */ 629 * rx++ = '['; 630 * rx++ = ' '; 631 * rx++ = '\t'; 632 * rx++ = ']'; 633 * rx++ = '*'; 634 635 /* But anchor it after that. */ 636 * rx++ = '$'; 637 * rx = '\0'; 638 639 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t)); 640 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB); 641 642 if (reg_err == 0) 643 return NULL; 644 else 645 { 646 static char msg[80]; 647 648 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80); 649 regfree ((regex_t *) CGEN_INSN_RX (insn)); 650 free (CGEN_INSN_RX (insn)); 651 (CGEN_INSN_RX (insn)) = NULL; 652 return msg; 653 } 654} 655 656 657/* Default insn parser. 658 659 The syntax string is scanned and operands are parsed and stored in FIELDS. 660 Relocs are queued as we go via other callbacks. 661 662 ??? Note that this is currently an all-or-nothing parser. If we fail to 663 parse the instruction, we return 0 and the caller will start over from 664 the beginning. Backtracking will be necessary in parsing subexpressions, 665 but that can be handled there. Not handling backtracking here may get 666 expensive in the case of the m68k. Deal with later. 667 668 Returns NULL for success, an error message for failure. */ 669 670static const char * 671parse_insn_normal (CGEN_CPU_DESC cd, 672 const CGEN_INSN *insn, 673 const char **strp, 674 CGEN_FIELDS *fields) 675{ 676 /* ??? Runtime added insns not handled yet. */ 677 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn); 678 const char *str = *strp; 679 const char *errmsg; 680 const char *p; 681 const CGEN_SYNTAX_CHAR_TYPE * syn; 682#ifdef CGEN_MNEMONIC_OPERANDS 683 /* FIXME: wip */ 684 int past_opcode_p; 685#endif 686 687 /* For now we assume the mnemonic is first (there are no leading operands). 688 We can parse it without needing to set up operand parsing. 689 GAS's input scrubber will ensure mnemonics are lowercase, but we may 690 not be called from GAS. */ 691 p = CGEN_INSN_MNEMONIC (insn); 692 while (*p && TOLOWER (*p) == TOLOWER (*str)) 693 ++p, ++str; 694 695 if (* p) 696 return _("unrecognized instruction"); 697 698#ifndef CGEN_MNEMONIC_OPERANDS 699 if (* str && ! ISSPACE (* str)) 700 return _("unrecognized instruction"); 701#endif 702 703 CGEN_INIT_PARSE (cd); 704 cgen_init_parse_operand (cd); 705#ifdef CGEN_MNEMONIC_OPERANDS 706 past_opcode_p = 0; 707#endif 708 709 /* We don't check for (*str != '\0') here because we want to parse 710 any trailing fake arguments in the syntax string. */ 711 syn = CGEN_SYNTAX_STRING (syntax); 712 713 /* Mnemonics come first for now, ensure valid string. */ 714 if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) 715 abort (); 716 717 ++syn; 718 719 while (* syn != 0) 720 { 721 /* Non operand chars must match exactly. */ 722 if (CGEN_SYNTAX_CHAR_P (* syn)) 723 { 724 /* FIXME: While we allow for non-GAS callers above, we assume the 725 first char after the mnemonic part is a space. */ 726 /* FIXME: We also take inappropriate advantage of the fact that 727 GAS's input scrubber will remove extraneous blanks. */ 728 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn))) 729 { 730#ifdef CGEN_MNEMONIC_OPERANDS 731 if (CGEN_SYNTAX_CHAR(* syn) == ' ') 732 past_opcode_p = 1; 733#endif 734 ++ syn; 735 ++ str; 736 } 737 else if (*str) 738 { 739 /* Syntax char didn't match. Can't be this insn. */ 740 static char msg [80]; 741 742 /* xgettext:c-format */ 743 sprintf (msg, _("syntax error (expected char `%c', found `%c')"), 744 CGEN_SYNTAX_CHAR(*syn), *str); 745 return msg; 746 } 747 else 748 { 749 /* Ran out of input. */ 750 static char msg [80]; 751 752 /* xgettext:c-format */ 753 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"), 754 CGEN_SYNTAX_CHAR(*syn)); 755 return msg; 756 } 757 continue; 758 } 759 760#ifdef CGEN_MNEMONIC_OPERANDS 761 (void) past_opcode_p; 762#endif 763 /* We have an operand of some sort. */ 764 errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields); 765 if (errmsg) 766 return errmsg; 767 768 /* Done with this operand, continue with next one. */ 769 ++ syn; 770 } 771 772 /* If we're at the end of the syntax string, we're done. */ 773 if (* syn == 0) 774 { 775 /* FIXME: For the moment we assume a valid `str' can only contain 776 blanks now. IE: We needn't try again with a longer version of 777 the insn and it is assumed that longer versions of insns appear 778 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */ 779 while (ISSPACE (* str)) 780 ++ str; 781 782 if (* str != '\0') 783 return _("junk at end of line"); /* FIXME: would like to include `str' */ 784 785 return NULL; 786 } 787 788 /* We couldn't parse it. */ 789 return _("unrecognized instruction"); 790} 791 792/* Main entry point. 793 This routine is called for each instruction to be assembled. 794 STR points to the insn to be assembled. 795 We assume all necessary tables have been initialized. 796 The assembled instruction, less any fixups, is stored in BUF. 797 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value 798 still needs to be converted to target byte order, otherwise BUF is an array 799 of bytes in target byte order. 800 The result is a pointer to the insn's entry in the opcode table, 801 or NULL if an error occured (an error message will have already been 802 printed). 803 804 Note that when processing (non-alias) macro-insns, 805 this function recurses. 806 807 ??? It's possible to make this cpu-independent. 808 One would have to deal with a few minor things. 809 At this point in time doing so would be more of a curiosity than useful 810 [for example this file isn't _that_ big], but keeping the possibility in 811 mind helps keep the design clean. */ 812 813const CGEN_INSN * 814ip2k_cgen_assemble_insn (CGEN_CPU_DESC cd, 815 const char *str, 816 CGEN_FIELDS *fields, 817 CGEN_INSN_BYTES_PTR buf, 818 char **errmsg) 819{ 820 const char *start; 821 CGEN_INSN_LIST *ilist; 822 const char *parse_errmsg = NULL; 823 const char *insert_errmsg = NULL; 824 int recognized_mnemonic = 0; 825 826 /* Skip leading white space. */ 827 while (ISSPACE (* str)) 828 ++ str; 829 830 /* The instructions are stored in hashed lists. 831 Get the first in the list. */ 832 ilist = CGEN_ASM_LOOKUP_INSN (cd, str); 833 834 /* Keep looking until we find a match. */ 835 start = str; 836 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist)) 837 { 838 const CGEN_INSN *insn = ilist->insn; 839 recognized_mnemonic = 1; 840 841#ifdef CGEN_VALIDATE_INSN_SUPPORTED 842 /* Not usually needed as unsupported opcodes 843 shouldn't be in the hash lists. */ 844 /* Is this insn supported by the selected cpu? */ 845 if (! ip2k_cgen_insn_supported (cd, insn)) 846 continue; 847#endif 848 /* If the RELAXED attribute is set, this is an insn that shouldn't be 849 chosen immediately. Instead, it is used during assembler/linker 850 relaxation if possible. */ 851 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0) 852 continue; 853 854 str = start; 855 856 /* Skip this insn if str doesn't look right lexically. */ 857 if (CGEN_INSN_RX (insn) != NULL && 858 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH) 859 continue; 860 861 /* Allow parse/insert handlers to obtain length of insn. */ 862 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn); 863 864 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields); 865 if (parse_errmsg != NULL) 866 continue; 867 868 /* ??? 0 is passed for `pc'. */ 869 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf, 870 (bfd_vma) 0); 871 if (insert_errmsg != NULL) 872 continue; 873 874 /* It is up to the caller to actually output the insn and any 875 queued relocs. */ 876 return insn; 877 } 878 879 { 880 static char errbuf[150]; 881 const char *tmp_errmsg; 882#ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS 883#define be_verbose 1 884#else 885#define be_verbose 0 886#endif 887 888 if (be_verbose) 889 { 890 /* If requesting verbose error messages, use insert_errmsg. 891 Failing that, use parse_errmsg. */ 892 tmp_errmsg = (insert_errmsg ? insert_errmsg : 893 parse_errmsg ? parse_errmsg : 894 recognized_mnemonic ? 895 _("unrecognized form of instruction") : 896 _("unrecognized instruction")); 897 898 if (strlen (start) > 50) 899 /* xgettext:c-format */ 900 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start); 901 else 902 /* xgettext:c-format */ 903 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start); 904 } 905 else 906 { 907 if (strlen (start) > 50) 908 /* xgettext:c-format */ 909 sprintf (errbuf, _("bad instruction `%.50s...'"), start); 910 else 911 /* xgettext:c-format */ 912 sprintf (errbuf, _("bad instruction `%.50s'"), start); 913 } 914 915 *errmsg = errbuf; 916 return NULL; 917 } 918} 919