1/* Assembler interface for targets using CGEN. -*- C -*- 2 CGEN: Cpu tools GENerator 3 4THIS FILE IS MACHINE GENERATED WITH CGEN. 5- the resultant file is machine generated, cgen-asm.in isn't 6 7Copyright 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. 8 9This file is part of the GNU Binutils and GDB, the GNU debugger. 10 11This program is free software; you can redistribute it and/or modify 12it under the terms of the GNU General Public License as published by 13the Free Software Foundation; either version 2, or (at your option) 14any later version. 15 16This program is distributed in the hope that it will be useful, 17but WITHOUT ANY WARRANTY; without even the implied warranty of 18MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19GNU General Public License for more details. 20 21You should have received a copy of the GNU General Public License 22along with this program; if not, write to the Free Software Foundation, Inc., 2359 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 24 25/* ??? Eventually more and more of this stuff can go to cpu-independent files. 26 Keep that in mind. */ 27 28#include "sysdep.h" 29#include <stdio.h> 30#include "ansidecl.h" 31#include "bfd.h" 32#include "symcat.h" 33#include "openrisc-desc.h" 34#include "openrisc-opc.h" 35#include "opintl.h" 36#include "xregex.h" 37#include "libiberty.h" 38#include "safe-ctype.h" 39 40#undef min 41#define min(a,b) ((a) < (b) ? (a) : (b)) 42#undef max 43#define max(a,b) ((a) > (b) ? (a) : (b)) 44 45static const char * parse_insn_normal 46 (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *); 47 48/* -- assembler routines inserted here. */ 49 50/* -- asm.c */ 51 52#define CGEN_VERBOSE_ASSEMBLER_ERRORS 53 54static const char * parse_hi16 55 PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *)); 56static const char * parse_lo16 57 PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *)); 58 59long 60openrisc_sign_extend_16bit (value) 61 long value; 62{ 63 return ((value & 0xffff) ^ 0x8000) - 0x8000; 64} 65 66/* Handle hi(). */ 67 68static const char * 69parse_hi16 (cd, strp, opindex, valuep) 70 CGEN_CPU_DESC cd; 71 const char **strp; 72 int opindex; 73 unsigned long *valuep; 74{ 75 const char *errmsg; 76 enum cgen_parse_operand_result result_type; 77 unsigned long ret; 78 79 if (**strp == '#') 80 ++*strp; 81 82 if (strncasecmp (*strp, "hi(", 3) == 0) 83 { 84 bfd_vma value; 85 86 *strp += 3; 87#if 0 88 errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep); 89 if (errmsg != NULL) 90 fprintf (stderr, "parse_hi: %s\n", errmsg); 91 if (errmsg != NULL) 92#endif 93 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16, 94 &result_type, &value); 95 if (**strp != ')') 96 return _("missing `)'"); 97 98 ++*strp; 99 if (errmsg == NULL 100 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 101 value >>= 16; 102 ret = value; 103 } 104 else 105 { 106 if (**strp == '-') 107 { 108 long value; 109 errmsg = cgen_parse_signed_integer (cd, strp, opindex, &value); 110 ret = value; 111 } 112 else 113 { 114 unsigned long value; 115 errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value); 116 ret = value; 117 } 118 } 119 120 *valuep = ((ret & 0xffff) ^ 0x8000) - 0x8000; 121 return errmsg; 122} 123 124/* Handle lo(). */ 125 126static const char * 127parse_lo16 (cd, strp, opindex, valuep) 128 CGEN_CPU_DESC cd; 129 const char **strp; 130 int opindex; 131 unsigned long *valuep; 132{ 133 const char *errmsg; 134 enum cgen_parse_operand_result result_type; 135 unsigned long ret; 136 137 if (**strp == '#') 138 ++*strp; 139 140 if (strncasecmp (*strp, "lo(", 3) == 0) 141 { 142 bfd_vma value; 143 144 *strp += 3; 145#if 0 146 errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep); 147 if (errmsg != NULL) 148 fprintf (stderr, "parse_lo: %s\n", errmsg); 149 150 if (errmsg != NULL) 151#endif 152 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16, 153 &result_type, &value); 154 if (**strp != ')') 155 return _("missing `)'"); 156 157 ++*strp; 158 ret = value; 159 } 160 else 161 { 162 if (**strp == '-') 163 { 164 long value; 165 errmsg = cgen_parse_signed_integer (cd, strp, opindex, &value); 166 ret = value; 167 } 168 else 169 { 170 unsigned long value; 171 errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value); 172 ret = value; 173 } 174 } 175 176 *valuep = ((ret & 0xffff) ^ 0x8000) - 0x8000; 177 return errmsg; 178} 179 180/* -- */ 181 182const char * openrisc_cgen_parse_operand 183 PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *)); 184 185/* Main entry point for operand parsing. 186 187 This function is basically just a big switch statement. Earlier versions 188 used tables to look up the function to use, but 189 - if the table contains both assembler and disassembler functions then 190 the disassembler contains much of the assembler and vice-versa, 191 - there's a lot of inlining possibilities as things grow, 192 - using a switch statement avoids the function call overhead. 193 194 This function could be moved into `parse_insn_normal', but keeping it 195 separate makes clear the interface between `parse_insn_normal' and each of 196 the handlers. */ 197 198const char * 199openrisc_cgen_parse_operand (cd, opindex, strp, fields) 200 CGEN_CPU_DESC cd; 201 int opindex; 202 const char ** strp; 203 CGEN_FIELDS * fields; 204{ 205 const char * errmsg = NULL; 206 /* Used by scalar operands that still need to be parsed. */ 207 long junk ATTRIBUTE_UNUSED; 208 209 switch (opindex) 210 { 211 case OPENRISC_OPERAND_ABS_26 : 212 { 213 bfd_vma value; 214 errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_ABS_26, 0, NULL, & value); 215 fields->f_abs26 = value; 216 } 217 break; 218 case OPENRISC_OPERAND_DISP_26 : 219 { 220 bfd_vma value; 221 errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_DISP_26, 0, NULL, & value); 222 fields->f_disp26 = value; 223 } 224 break; 225 case OPENRISC_OPERAND_HI16 : 226 errmsg = parse_hi16 (cd, strp, OPENRISC_OPERAND_HI16, &fields->f_simm16); 227 break; 228 case OPENRISC_OPERAND_LO16 : 229 errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_LO16, &fields->f_lo16); 230 break; 231 case OPENRISC_OPERAND_OP_F_23 : 232 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_23, &fields->f_op4); 233 break; 234 case OPENRISC_OPERAND_OP_F_3 : 235 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_3, &fields->f_op5); 236 break; 237 case OPENRISC_OPERAND_RA : 238 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r2); 239 break; 240 case OPENRISC_OPERAND_RB : 241 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r3); 242 break; 243 case OPENRISC_OPERAND_RD : 244 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r1); 245 break; 246 case OPENRISC_OPERAND_SIMM_16 : 247 errmsg = cgen_parse_signed_integer (cd, strp, OPENRISC_OPERAND_SIMM_16, &fields->f_simm16); 248 break; 249 case OPENRISC_OPERAND_UI16NC : 250 errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_UI16NC, &fields->f_i16nc); 251 break; 252 case OPENRISC_OPERAND_UIMM_16 : 253 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_16, &fields->f_uimm16); 254 break; 255 case OPENRISC_OPERAND_UIMM_5 : 256 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_5, &fields->f_uimm5); 257 break; 258 259 default : 260 /* xgettext:c-format */ 261 fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex); 262 abort (); 263 } 264 265 return errmsg; 266} 267 268cgen_parse_fn * const openrisc_cgen_parse_handlers[] = 269{ 270 parse_insn_normal, 271}; 272 273void 274openrisc_cgen_init_asm (cd) 275 CGEN_CPU_DESC cd; 276{ 277 openrisc_cgen_init_opcode_table (cd); 278 openrisc_cgen_init_ibld_table (cd); 279 cd->parse_handlers = & openrisc_cgen_parse_handlers[0]; 280 cd->parse_operand = openrisc_cgen_parse_operand; 281} 282 283 284 285/* Regex construction routine. 286 287 This translates an opcode syntax string into a regex string, 288 by replacing any non-character syntax element (such as an 289 opcode) with the pattern '.*' 290 291 It then compiles the regex and stores it in the opcode, for 292 later use by openrisc_cgen_assemble_insn 293 294 Returns NULL for success, an error message for failure. */ 295 296char * 297openrisc_cgen_build_insn_regex (CGEN_INSN *insn) 298{ 299 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn); 300 const char *mnem = CGEN_INSN_MNEMONIC (insn); 301 char rxbuf[CGEN_MAX_RX_ELEMENTS]; 302 char *rx = rxbuf; 303 const CGEN_SYNTAX_CHAR_TYPE *syn; 304 int reg_err; 305 306 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc)); 307 308 /* Mnemonics come first in the syntax string. */ 309 if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) 310 return _("missing mnemonic in syntax string"); 311 ++syn; 312 313 /* Generate a case sensitive regular expression that emulates case 314 insensitive matching in the "C" locale. We cannot generate a case 315 insensitive regular expression because in Turkish locales, 'i' and 'I' 316 are not equal modulo case conversion. */ 317 318 /* Copy the literal mnemonic out of the insn. */ 319 for (; *mnem; mnem++) 320 { 321 char c = *mnem; 322 323 if (ISALPHA (c)) 324 { 325 *rx++ = '['; 326 *rx++ = TOLOWER (c); 327 *rx++ = TOUPPER (c); 328 *rx++ = ']'; 329 } 330 else 331 *rx++ = c; 332 } 333 334 /* Copy any remaining literals from the syntax string into the rx. */ 335 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn) 336 { 337 if (CGEN_SYNTAX_CHAR_P (* syn)) 338 { 339 char c = CGEN_SYNTAX_CHAR (* syn); 340 341 switch (c) 342 { 343 /* Escape any regex metacharacters in the syntax. */ 344 case '.': case '[': case '\\': 345 case '*': case '^': case '$': 346 347#ifdef CGEN_ESCAPE_EXTENDED_REGEX 348 case '?': case '{': case '}': 349 case '(': case ')': case '*': 350 case '|': case '+': case ']': 351#endif 352 *rx++ = '\\'; 353 *rx++ = c; 354 break; 355 356 default: 357 if (ISALPHA (c)) 358 { 359 *rx++ = '['; 360 *rx++ = TOLOWER (c); 361 *rx++ = TOUPPER (c); 362 *rx++ = ']'; 363 } 364 else 365 *rx++ = c; 366 break; 367 } 368 } 369 else 370 { 371 /* Replace non-syntax fields with globs. */ 372 *rx++ = '.'; 373 *rx++ = '*'; 374 } 375 } 376 377 /* Trailing whitespace ok. */ 378 * rx++ = '['; 379 * rx++ = ' '; 380 * rx++ = '\t'; 381 * rx++ = ']'; 382 * rx++ = '*'; 383 384 /* But anchor it after that. */ 385 * rx++ = '$'; 386 * rx = '\0'; 387 388 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t)); 389 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB); 390 391 if (reg_err == 0) 392 return NULL; 393 else 394 { 395 static char msg[80]; 396 397 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80); 398 regfree ((regex_t *) CGEN_INSN_RX (insn)); 399 free (CGEN_INSN_RX (insn)); 400 (CGEN_INSN_RX (insn)) = NULL; 401 return msg; 402 } 403} 404 405 406/* Default insn parser. 407 408 The syntax string is scanned and operands are parsed and stored in FIELDS. 409 Relocs are queued as we go via other callbacks. 410 411 ??? Note that this is currently an all-or-nothing parser. If we fail to 412 parse the instruction, we return 0 and the caller will start over from 413 the beginning. Backtracking will be necessary in parsing subexpressions, 414 but that can be handled there. Not handling backtracking here may get 415 expensive in the case of the m68k. Deal with later. 416 417 Returns NULL for success, an error message for failure. */ 418 419static const char * 420parse_insn_normal (CGEN_CPU_DESC cd, 421 const CGEN_INSN *insn, 422 const char **strp, 423 CGEN_FIELDS *fields) 424{ 425 /* ??? Runtime added insns not handled yet. */ 426 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn); 427 const char *str = *strp; 428 const char *errmsg; 429 const char *p; 430 const CGEN_SYNTAX_CHAR_TYPE * syn; 431#ifdef CGEN_MNEMONIC_OPERANDS 432 /* FIXME: wip */ 433 int past_opcode_p; 434#endif 435 436 /* For now we assume the mnemonic is first (there are no leading operands). 437 We can parse it without needing to set up operand parsing. 438 GAS's input scrubber will ensure mnemonics are lowercase, but we may 439 not be called from GAS. */ 440 p = CGEN_INSN_MNEMONIC (insn); 441 while (*p && TOLOWER (*p) == TOLOWER (*str)) 442 ++p, ++str; 443 444 if (* p) 445 return _("unrecognized instruction"); 446 447#ifndef CGEN_MNEMONIC_OPERANDS 448 if (* str && ! ISSPACE (* str)) 449 return _("unrecognized instruction"); 450#endif 451 452 CGEN_INIT_PARSE (cd); 453 cgen_init_parse_operand (cd); 454#ifdef CGEN_MNEMONIC_OPERANDS 455 past_opcode_p = 0; 456#endif 457 458 /* We don't check for (*str != '\0') here because we want to parse 459 any trailing fake arguments in the syntax string. */ 460 syn = CGEN_SYNTAX_STRING (syntax); 461 462 /* Mnemonics come first for now, ensure valid string. */ 463 if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) 464 abort (); 465 466 ++syn; 467 468 while (* syn != 0) 469 { 470 /* Non operand chars must match exactly. */ 471 if (CGEN_SYNTAX_CHAR_P (* syn)) 472 { 473 /* FIXME: While we allow for non-GAS callers above, we assume the 474 first char after the mnemonic part is a space. */ 475 /* FIXME: We also take inappropriate advantage of the fact that 476 GAS's input scrubber will remove extraneous blanks. */ 477 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn))) 478 { 479#ifdef CGEN_MNEMONIC_OPERANDS 480 if (CGEN_SYNTAX_CHAR(* syn) == ' ') 481 past_opcode_p = 1; 482#endif 483 ++ syn; 484 ++ str; 485 } 486 else if (*str) 487 { 488 /* Syntax char didn't match. Can't be this insn. */ 489 static char msg [80]; 490 491 /* xgettext:c-format */ 492 sprintf (msg, _("syntax error (expected char `%c', found `%c')"), 493 CGEN_SYNTAX_CHAR(*syn), *str); 494 return msg; 495 } 496 else 497 { 498 /* Ran out of input. */ 499 static char msg [80]; 500 501 /* xgettext:c-format */ 502 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"), 503 CGEN_SYNTAX_CHAR(*syn)); 504 return msg; 505 } 506 continue; 507 } 508 509 /* We have an operand of some sort. */ 510 errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), 511 &str, fields); 512 if (errmsg) 513 return errmsg; 514 515 /* Done with this operand, continue with next one. */ 516 ++ syn; 517 } 518 519 /* If we're at the end of the syntax string, we're done. */ 520 if (* syn == 0) 521 { 522 /* FIXME: For the moment we assume a valid `str' can only contain 523 blanks now. IE: We needn't try again with a longer version of 524 the insn and it is assumed that longer versions of insns appear 525 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */ 526 while (ISSPACE (* str)) 527 ++ str; 528 529 if (* str != '\0') 530 return _("junk at end of line"); /* FIXME: would like to include `str' */ 531 532 return NULL; 533 } 534 535 /* We couldn't parse it. */ 536 return _("unrecognized instruction"); 537} 538 539/* Main entry point. 540 This routine is called for each instruction to be assembled. 541 STR points to the insn to be assembled. 542 We assume all necessary tables have been initialized. 543 The assembled instruction, less any fixups, is stored in BUF. 544 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value 545 still needs to be converted to target byte order, otherwise BUF is an array 546 of bytes in target byte order. 547 The result is a pointer to the insn's entry in the opcode table, 548 or NULL if an error occured (an error message will have already been 549 printed). 550 551 Note that when processing (non-alias) macro-insns, 552 this function recurses. 553 554 ??? It's possible to make this cpu-independent. 555 One would have to deal with a few minor things. 556 At this point in time doing so would be more of a curiosity than useful 557 [for example this file isn't _that_ big], but keeping the possibility in 558 mind helps keep the design clean. */ 559 560const CGEN_INSN * 561openrisc_cgen_assemble_insn (CGEN_CPU_DESC cd, 562 const char *str, 563 CGEN_FIELDS *fields, 564 CGEN_INSN_BYTES_PTR buf, 565 char **errmsg) 566{ 567 const char *start; 568 CGEN_INSN_LIST *ilist; 569 const char *parse_errmsg = NULL; 570 const char *insert_errmsg = NULL; 571 int recognized_mnemonic = 0; 572 573 /* Skip leading white space. */ 574 while (ISSPACE (* str)) 575 ++ str; 576 577 /* The instructions are stored in hashed lists. 578 Get the first in the list. */ 579 ilist = CGEN_ASM_LOOKUP_INSN (cd, str); 580 581 /* Keep looking until we find a match. */ 582 start = str; 583 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist)) 584 { 585 const CGEN_INSN *insn = ilist->insn; 586 recognized_mnemonic = 1; 587 588#ifdef CGEN_VALIDATE_INSN_SUPPORTED 589 /* Not usually needed as unsupported opcodes 590 shouldn't be in the hash lists. */ 591 /* Is this insn supported by the selected cpu? */ 592 if (! openrisc_cgen_insn_supported (cd, insn)) 593 continue; 594#endif 595 /* If the RELAXED attribute is set, this is an insn that shouldn't be 596 chosen immediately. Instead, it is used during assembler/linker 597 relaxation if possible. */ 598 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0) 599 continue; 600 601 str = start; 602 603 /* Skip this insn if str doesn't look right lexically. */ 604 if (CGEN_INSN_RX (insn) != NULL && 605 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH) 606 continue; 607 608 /* Allow parse/insert handlers to obtain length of insn. */ 609 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn); 610 611 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields); 612 if (parse_errmsg != NULL) 613 continue; 614 615 /* ??? 0 is passed for `pc'. */ 616 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf, 617 (bfd_vma) 0); 618 if (insert_errmsg != NULL) 619 continue; 620 621 /* It is up to the caller to actually output the insn and any 622 queued relocs. */ 623 return insn; 624 } 625 626 { 627 static char errbuf[150]; 628#ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS 629 const char *tmp_errmsg; 630 631 /* If requesting verbose error messages, use insert_errmsg. 632 Failing that, use parse_errmsg. */ 633 tmp_errmsg = (insert_errmsg ? insert_errmsg : 634 parse_errmsg ? parse_errmsg : 635 recognized_mnemonic ? 636 _("unrecognized form of instruction") : 637 _("unrecognized instruction")); 638 639 if (strlen (start) > 50) 640 /* xgettext:c-format */ 641 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start); 642 else 643 /* xgettext:c-format */ 644 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start); 645#else 646 if (strlen (start) > 50) 647 /* xgettext:c-format */ 648 sprintf (errbuf, _("bad instruction `%.50s...'"), start); 649 else 650 /* xgettext:c-format */ 651 sprintf (errbuf, _("bad instruction `%.50s'"), start); 652#endif 653 654 *errmsg = errbuf; 655 return NULL; 656 } 657} 658 659#if 0 /* This calls back to GAS which we can't do without care. */ 660 661/* Record each member of OPVALS in the assembler's symbol table. 662 This lets GAS parse registers for us. 663 ??? Interesting idea but not currently used. */ 664 665/* Record each member of OPVALS in the assembler's symbol table. 666 FIXME: Not currently used. */ 667 668void 669openrisc_cgen_asm_hash_keywords (CGEN_CPU_DESC cd, CGEN_KEYWORD *opvals) 670{ 671 CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL); 672 const CGEN_KEYWORD_ENTRY * ke; 673 674 while ((ke = cgen_keyword_search_next (& search)) != NULL) 675 { 676#if 0 /* Unnecessary, should be done in the search routine. */ 677 if (! openrisc_cgen_opval_supported (ke)) 678 continue; 679#endif 680 cgen_asm_record_register (cd, ke->name, ke->value); 681 } 682} 683 684#endif /* 0 */ 685