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