1 /* DO NOT EDIT! -*- buffer-read-only: t -*- vi:set ro: */ 2 /* Assembler interface for targets using CGEN. -*- C -*- 3 CGEN: Cpu tools GENerator 4 5 THIS FILE IS MACHINE GENERATED WITH CGEN. 6 - the resultant file is machine generated, cgen-asm.in isn't 7 8 Copyright (C) 1996-2018 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 "epiphany-desc.h" 36 #include "epiphany-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 const char * 54 parse_shortregs (CGEN_CPU_DESC cd, 55 const char ** strp, 56 CGEN_KEYWORD * keywords, 57 long * regno) 58 { 59 const char * errmsg; 60 61 /* Parse register. */ 62 errmsg = cgen_parse_keyword (cd, strp, keywords, regno); 63 64 if (errmsg) 65 return errmsg; 66 67 if (*regno > 7) 68 errmsg = _("register unavailable for short instructions"); 69 70 return errmsg; 71 } 72 73 static const char * parse_simm_not_reg (CGEN_CPU_DESC, const char **, int, 74 long *); 75 76 static const char * 77 parse_uimm_not_reg (CGEN_CPU_DESC cd, 78 const char ** strp, 79 int opindex, 80 unsigned long * valuep) 81 { 82 long * svalp = (void *) valuep; 83 return parse_simm_not_reg (cd, strp, opindex, svalp); 84 } 85 86 /* Handle simm3/simm11/imm3/imm12. */ 87 88 static const char * 89 parse_simm_not_reg (CGEN_CPU_DESC cd, 90 const char ** strp, 91 int opindex, 92 long * valuep) 93 { 94 const char * errmsg; 95 96 int sign = 0; 97 int bits = 0; 98 99 switch (opindex) 100 { 101 case EPIPHANY_OPERAND_SIMM3: 102 sign = 1; bits = 3; break; 103 case EPIPHANY_OPERAND_SIMM11: 104 sign = 1; bits = 11; break; 105 case EPIPHANY_OPERAND_DISP3: 106 sign = 0; bits = 3; break; 107 case EPIPHANY_OPERAND_DISP11: 108 /* Load/store displacement is a sign-magnitude 12 bit value. */ 109 sign = 0; bits = 11; break; 110 } 111 112 /* First try to parse as a register name and reject the operand. */ 113 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names,valuep); 114 if (!errmsg) 115 return _("register name used as immediate value"); 116 117 errmsg = (sign ? cgen_parse_signed_integer (cd, strp, opindex, valuep) 118 : cgen_parse_unsigned_integer (cd, strp, opindex, 119 (unsigned long *) valuep)); 120 if (errmsg) 121 return errmsg; 122 123 if (sign) 124 errmsg = cgen_validate_signed_integer (*valuep, 125 -((1L << bits) - 1), (1 << (bits - 1)) - 1); 126 else 127 errmsg = cgen_validate_unsigned_integer (*valuep, 0, (1L << bits) - 1); 128 129 return errmsg; 130 } 131 132 static const char * 133 parse_postindex (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED, 134 const char ** strp, 135 int opindex ATTRIBUTE_UNUSED, 136 unsigned long *valuep) 137 { 138 if (**strp == '#') 139 ++*strp; /* Skip leading hashes. */ 140 141 if (**strp == '-') 142 { 143 *valuep = 1; 144 ++*strp; 145 } 146 else if (**strp == '+') 147 { 148 *valuep = 0; 149 ++*strp; 150 } 151 else 152 *valuep = 0; 153 154 return NULL; 155 } 156 157 static const char * 158 parse_imm8 (CGEN_CPU_DESC cd, 159 const char ** strp, 160 int opindex, 161 bfd_reloc_code_real_type code, 162 enum cgen_parse_operand_result * result_type, 163 bfd_vma * valuep) 164 { 165 const char * errmsg; 166 enum cgen_parse_operand_result rt; 167 long dummyval; 168 169 if (!result_type) 170 result_type = &rt; 171 172 code = BFD_RELOC_NONE; 173 174 if (!cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_gr_names, &dummyval) 175 || !cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_cr_names, 176 &dummyval)) 177 /* Don't treat "mov ip,ip" as a move-immediate. */ 178 return _("register source in immediate move"); 179 180 errmsg = cgen_parse_address (cd, strp, opindex, code, result_type, valuep); 181 if (errmsg) 182 return errmsg; 183 184 if (*result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 185 errmsg = cgen_validate_unsigned_integer (*valuep, 0, 0xff); 186 else 187 errmsg = _("byte relocation unsupported"); 188 189 *valuep &= 0xff; 190 return errmsg; 191 } 192 193 static const char * MISSING_CLOSE_PARENTHESIS = N_("missing `)'"); 194 195 static const char * 196 parse_imm16 (CGEN_CPU_DESC cd, 197 const char ** strp, 198 int opindex, 199 bfd_reloc_code_real_type code ATTRIBUTE_UNUSED, 200 enum cgen_parse_operand_result * result_type, 201 bfd_vma * valuep) 202 { 203 const char * errmsg; 204 enum cgen_parse_operand_result rt; 205 long dummyval; 206 207 if (!result_type) 208 result_type = &rt; 209 210 if (strncasecmp (*strp, "%high(", 6) == 0) 211 { 212 *strp += 6; 213 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_EPIPHANY_HIGH, 214 result_type, valuep); 215 if (**strp != ')') 216 return MISSING_CLOSE_PARENTHESIS; 217 ++*strp; 218 *valuep >>= 16; 219 } 220 else if (strncasecmp (*strp, "%low(", 5) == 0) 221 { 222 *strp += 5; 223 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_EPIPHANY_LOW, 224 result_type, valuep); 225 if (**strp != ')') 226 return MISSING_CLOSE_PARENTHESIS; 227 ++*strp; 228 } 229 else if (!cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_gr_names, 230 &dummyval) 231 || !cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_cr_names, 232 &dummyval)) 233 /* Don't treat "mov ip,ip" as a move-immediate. */ 234 return _("register source in immediate move"); 235 else 236 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_16, 237 result_type, valuep); 238 239 if (!errmsg && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 240 errmsg = cgen_validate_unsigned_integer (*valuep, 0, 0xffff); 241 242 *valuep &= 0xffff; 243 return errmsg; 244 } 245 246 const char * 247 parse_branch_addr (CGEN_CPU_DESC cd, 248 const char ** strp, 249 int opindex, 250 int opinfo ATTRIBUTE_UNUSED, 251 enum cgen_parse_operand_result * resultp ATTRIBUTE_UNUSED, 252 bfd_vma *valuep ATTRIBUTE_UNUSED) 253 { 254 const char * errmsg; 255 enum cgen_parse_operand_result result_type; 256 bfd_reloc_code_real_type code = BFD_RELOC_NONE; 257 bfd_vma value; 258 259 switch (opindex) 260 { 261 case EPIPHANY_OPERAND_SIMM24: 262 code = BFD_RELOC_EPIPHANY_SIMM24; 263 break; 264 265 case EPIPHANY_OPERAND_SIMM8: 266 code = BFD_RELOC_EPIPHANY_SIMM8; 267 break; 268 269 default: 270 errmsg = _("ABORT: unknown operand"); 271 return errmsg; 272 } 273 274 errmsg = cgen_parse_address (cd, strp, opindex, code, 275 &result_type, &value); 276 if (errmsg == NULL) 277 { 278 if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) 279 { 280 /* Act as if we had done a PC-relative branch, ala .+num. */ 281 char buf[20]; 282 const char * bufp = (const char *) buf; 283 284 sprintf (buf, ".+%ld", (long) value); 285 errmsg = cgen_parse_address (cd, &bufp, opindex, code, &result_type, 286 &value); 287 } 288 289 if (result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED) 290 { 291 /* This will happen for things like (s2-s1) where s2 and s1 292 are labels. */ 293 /* Nothing further to be done. */ 294 } 295 else 296 errmsg = _("Not a pc-relative address."); 297 } 298 return errmsg; 299 } 300 301 /* -- dis.c */ 302 303 const char * epiphany_cgen_parse_operand 304 (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *); 305 306 /* Main entry point for operand parsing. 307 308 This function is basically just a big switch statement. Earlier versions 309 used tables to look up the function to use, but 310 - if the table contains both assembler and disassembler functions then 311 the disassembler contains much of the assembler and vice-versa, 312 - there's a lot of inlining possibilities as things grow, 313 - using a switch statement avoids the function call overhead. 314 315 This function could be moved into `parse_insn_normal', but keeping it 316 separate makes clear the interface between `parse_insn_normal' and each of 317 the handlers. */ 318 319 const char * 320 epiphany_cgen_parse_operand (CGEN_CPU_DESC cd, 321 int opindex, 322 const char ** strp, 323 CGEN_FIELDS * fields) 324 { 325 const char * errmsg = NULL; 326 /* Used by scalar operands that still need to be parsed. */ 327 long junk ATTRIBUTE_UNUSED; 328 329 switch (opindex) 330 { 331 case EPIPHANY_OPERAND_DIRECTION : 332 errmsg = parse_postindex (cd, strp, EPIPHANY_OPERAND_DIRECTION, (unsigned long *) (& fields->f_addsubx)); 333 break; 334 case EPIPHANY_OPERAND_DISP11 : 335 errmsg = parse_uimm_not_reg (cd, strp, EPIPHANY_OPERAND_DISP11, (unsigned long *) (& fields->f_disp11)); 336 break; 337 case EPIPHANY_OPERAND_DISP3 : 338 errmsg = cgen_parse_unsigned_integer (cd, strp, EPIPHANY_OPERAND_DISP3, (unsigned long *) (& fields->f_disp3)); 339 break; 340 case EPIPHANY_OPERAND_DPMI : 341 errmsg = parse_postindex (cd, strp, EPIPHANY_OPERAND_DPMI, (unsigned long *) (& fields->f_subd)); 342 break; 343 case EPIPHANY_OPERAND_FRD : 344 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd); 345 break; 346 case EPIPHANY_OPERAND_FRD6 : 347 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd6); 348 break; 349 case EPIPHANY_OPERAND_FRM : 350 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm); 351 break; 352 case EPIPHANY_OPERAND_FRM6 : 353 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm6); 354 break; 355 case EPIPHANY_OPERAND_FRN : 356 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn); 357 break; 358 case EPIPHANY_OPERAND_FRN6 : 359 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn6); 360 break; 361 case EPIPHANY_OPERAND_IMM16 : 362 { 363 bfd_vma value = 0; 364 errmsg = parse_imm16 (cd, strp, EPIPHANY_OPERAND_IMM16, 0, NULL, & value); 365 fields->f_imm16 = value; 366 } 367 break; 368 case EPIPHANY_OPERAND_IMM8 : 369 { 370 bfd_vma value = 0; 371 errmsg = parse_imm8 (cd, strp, EPIPHANY_OPERAND_IMM8, 0, NULL, & value); 372 fields->f_imm8 = value; 373 } 374 break; 375 case EPIPHANY_OPERAND_RD : 376 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd); 377 break; 378 case EPIPHANY_OPERAND_RD6 : 379 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd6); 380 break; 381 case EPIPHANY_OPERAND_RM : 382 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm); 383 break; 384 case EPIPHANY_OPERAND_RM6 : 385 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm6); 386 break; 387 case EPIPHANY_OPERAND_RN : 388 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn); 389 break; 390 case EPIPHANY_OPERAND_RN6 : 391 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn6); 392 break; 393 case EPIPHANY_OPERAND_SD : 394 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sd); 395 break; 396 case EPIPHANY_OPERAND_SD6 : 397 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sd6); 398 break; 399 case EPIPHANY_OPERAND_SDDMA : 400 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crdma_names, & fields->f_sd6); 401 break; 402 case EPIPHANY_OPERAND_SDMEM : 403 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmem_names, & fields->f_sd6); 404 break; 405 case EPIPHANY_OPERAND_SDMESH : 406 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmesh_names, & fields->f_sd6); 407 break; 408 case EPIPHANY_OPERAND_SHIFT : 409 errmsg = cgen_parse_unsigned_integer (cd, strp, EPIPHANY_OPERAND_SHIFT, (unsigned long *) (& fields->f_shift)); 410 break; 411 case EPIPHANY_OPERAND_SIMM11 : 412 errmsg = parse_simm_not_reg (cd, strp, EPIPHANY_OPERAND_SIMM11, (long *) (& fields->f_sdisp11)); 413 break; 414 case EPIPHANY_OPERAND_SIMM24 : 415 { 416 bfd_vma value = 0; 417 errmsg = parse_branch_addr (cd, strp, EPIPHANY_OPERAND_SIMM24, 0, NULL, & value); 418 fields->f_simm24 = value; 419 } 420 break; 421 case EPIPHANY_OPERAND_SIMM3 : 422 errmsg = parse_simm_not_reg (cd, strp, EPIPHANY_OPERAND_SIMM3, (long *) (& fields->f_sdisp3)); 423 break; 424 case EPIPHANY_OPERAND_SIMM8 : 425 { 426 bfd_vma value = 0; 427 errmsg = parse_branch_addr (cd, strp, EPIPHANY_OPERAND_SIMM8, 0, NULL, & value); 428 fields->f_simm8 = value; 429 } 430 break; 431 case EPIPHANY_OPERAND_SN : 432 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sn); 433 break; 434 case EPIPHANY_OPERAND_SN6 : 435 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sn6); 436 break; 437 case EPIPHANY_OPERAND_SNDMA : 438 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crdma_names, & fields->f_sn6); 439 break; 440 case EPIPHANY_OPERAND_SNMEM : 441 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmem_names, & fields->f_sn6); 442 break; 443 case EPIPHANY_OPERAND_SNMESH : 444 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmesh_names, & fields->f_sn6); 445 break; 446 case EPIPHANY_OPERAND_SWI_NUM : 447 errmsg = parse_uimm_not_reg (cd, strp, EPIPHANY_OPERAND_SWI_NUM, (unsigned long *) (& fields->f_trap_num)); 448 break; 449 case EPIPHANY_OPERAND_TRAPNUM6 : 450 errmsg = cgen_parse_unsigned_integer (cd, strp, EPIPHANY_OPERAND_TRAPNUM6, (unsigned long *) (& fields->f_trap_num)); 451 break; 452 453 default : 454 /* xgettext:c-format */ 455 fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex); 456 abort (); 457 } 458 459 return errmsg; 460 } 461 462 cgen_parse_fn * const epiphany_cgen_parse_handlers[] = 463 { 464 parse_insn_normal, 465 }; 466 467 void 468 epiphany_cgen_init_asm (CGEN_CPU_DESC cd) 469 { 470 epiphany_cgen_init_opcode_table (cd); 471 epiphany_cgen_init_ibld_table (cd); 472 cd->parse_handlers = & epiphany_cgen_parse_handlers[0]; 473 cd->parse_operand = epiphany_cgen_parse_operand; 474 #ifdef CGEN_ASM_INIT_HOOK 475 CGEN_ASM_INIT_HOOK 476 #endif 477 } 478 479 480 481 /* Regex construction routine. 482 483 This translates an opcode syntax string into a regex string, 484 by replacing any non-character syntax element (such as an 485 opcode) with the pattern '.*' 486 487 It then compiles the regex and stores it in the opcode, for 488 later use by epiphany_cgen_assemble_insn 489 490 Returns NULL for success, an error message for failure. */ 491 492 char * 493 epiphany_cgen_build_insn_regex (CGEN_INSN *insn) 494 { 495 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn); 496 const char *mnem = CGEN_INSN_MNEMONIC (insn); 497 char rxbuf[CGEN_MAX_RX_ELEMENTS]; 498 char *rx = rxbuf; 499 const CGEN_SYNTAX_CHAR_TYPE *syn; 500 int reg_err; 501 502 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc)); 503 504 /* Mnemonics come first in the syntax string. */ 505 if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) 506 return _("missing mnemonic in syntax string"); 507 ++syn; 508 509 /* Generate a case sensitive regular expression that emulates case 510 insensitive matching in the "C" locale. We cannot generate a case 511 insensitive regular expression because in Turkish locales, 'i' and 'I' 512 are not equal modulo case conversion. */ 513 514 /* Copy the literal mnemonic out of the insn. */ 515 for (; *mnem; mnem++) 516 { 517 char c = *mnem; 518 519 if (ISALPHA (c)) 520 { 521 *rx++ = '['; 522 *rx++ = TOLOWER (c); 523 *rx++ = TOUPPER (c); 524 *rx++ = ']'; 525 } 526 else 527 *rx++ = c; 528 } 529 530 /* Copy any remaining literals from the syntax string into the rx. */ 531 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn) 532 { 533 if (CGEN_SYNTAX_CHAR_P (* syn)) 534 { 535 char c = CGEN_SYNTAX_CHAR (* syn); 536 537 switch (c) 538 { 539 /* Escape any regex metacharacters in the syntax. */ 540 case '.': case '[': case '\\': 541 case '*': case '^': case '$': 542 543 #ifdef CGEN_ESCAPE_EXTENDED_REGEX 544 case '?': case '{': case '}': 545 case '(': case ')': case '*': 546 case '|': case '+': case ']': 547 #endif 548 *rx++ = '\\'; 549 *rx++ = c; 550 break; 551 552 default: 553 if (ISALPHA (c)) 554 { 555 *rx++ = '['; 556 *rx++ = TOLOWER (c); 557 *rx++ = TOUPPER (c); 558 *rx++ = ']'; 559 } 560 else 561 *rx++ = c; 562 break; 563 } 564 } 565 else 566 { 567 /* Replace non-syntax fields with globs. */ 568 *rx++ = '.'; 569 *rx++ = '*'; 570 } 571 } 572 573 /* Trailing whitespace ok. */ 574 * rx++ = '['; 575 * rx++ = ' '; 576 * rx++ = '\t'; 577 * rx++ = ']'; 578 * rx++ = '*'; 579 580 /* But anchor it after that. */ 581 * rx++ = '$'; 582 * rx = '\0'; 583 584 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t)); 585 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB); 586 587 if (reg_err == 0) 588 return NULL; 589 else 590 { 591 static char msg[80]; 592 593 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80); 594 regfree ((regex_t *) CGEN_INSN_RX (insn)); 595 free (CGEN_INSN_RX (insn)); 596 (CGEN_INSN_RX (insn)) = NULL; 597 return msg; 598 } 599 } 600 601 602 /* Default insn parser. 603 604 The syntax string is scanned and operands are parsed and stored in FIELDS. 605 Relocs are queued as we go via other callbacks. 606 607 ??? Note that this is currently an all-or-nothing parser. If we fail to 608 parse the instruction, we return 0 and the caller will start over from 609 the beginning. Backtracking will be necessary in parsing subexpressions, 610 but that can be handled there. Not handling backtracking here may get 611 expensive in the case of the m68k. Deal with later. 612 613 Returns NULL for success, an error message for failure. */ 614 615 static const char * 616 parse_insn_normal (CGEN_CPU_DESC cd, 617 const CGEN_INSN *insn, 618 const char **strp, 619 CGEN_FIELDS *fields) 620 { 621 /* ??? Runtime added insns not handled yet. */ 622 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn); 623 const char *str = *strp; 624 const char *errmsg; 625 const char *p; 626 const CGEN_SYNTAX_CHAR_TYPE * syn; 627 #ifdef CGEN_MNEMONIC_OPERANDS 628 /* FIXME: wip */ 629 int past_opcode_p; 630 #endif 631 632 /* For now we assume the mnemonic is first (there are no leading operands). 633 We can parse it without needing to set up operand parsing. 634 GAS's input scrubber will ensure mnemonics are lowercase, but we may 635 not be called from GAS. */ 636 p = CGEN_INSN_MNEMONIC (insn); 637 while (*p && TOLOWER (*p) == TOLOWER (*str)) 638 ++p, ++str; 639 640 if (* p) 641 return _("unrecognized instruction"); 642 643 #ifndef CGEN_MNEMONIC_OPERANDS 644 if (* str && ! ISSPACE (* str)) 645 return _("unrecognized instruction"); 646 #endif 647 648 CGEN_INIT_PARSE (cd); 649 cgen_init_parse_operand (cd); 650 #ifdef CGEN_MNEMONIC_OPERANDS 651 past_opcode_p = 0; 652 #endif 653 654 /* We don't check for (*str != '\0') here because we want to parse 655 any trailing fake arguments in the syntax string. */ 656 syn = CGEN_SYNTAX_STRING (syntax); 657 658 /* Mnemonics come first for now, ensure valid string. */ 659 if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) 660 abort (); 661 662 ++syn; 663 664 while (* syn != 0) 665 { 666 /* Non operand chars must match exactly. */ 667 if (CGEN_SYNTAX_CHAR_P (* syn)) 668 { 669 /* FIXME: While we allow for non-GAS callers above, we assume the 670 first char after the mnemonic part is a space. */ 671 /* FIXME: We also take inappropriate advantage of the fact that 672 GAS's input scrubber will remove extraneous blanks. */ 673 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn))) 674 { 675 #ifdef CGEN_MNEMONIC_OPERANDS 676 if (CGEN_SYNTAX_CHAR(* syn) == ' ') 677 past_opcode_p = 1; 678 #endif 679 ++ syn; 680 ++ str; 681 } 682 else if (*str) 683 { 684 /* Syntax char didn't match. Can't be this insn. */ 685 static char msg [80]; 686 687 /* xgettext:c-format */ 688 sprintf (msg, _("syntax error (expected char `%c', found `%c')"), 689 CGEN_SYNTAX_CHAR(*syn), *str); 690 return msg; 691 } 692 else 693 { 694 /* Ran out of input. */ 695 static char msg [80]; 696 697 /* xgettext:c-format */ 698 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"), 699 CGEN_SYNTAX_CHAR(*syn)); 700 return msg; 701 } 702 continue; 703 } 704 705 #ifdef CGEN_MNEMONIC_OPERANDS 706 (void) past_opcode_p; 707 #endif 708 /* We have an operand of some sort. */ 709 errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields); 710 if (errmsg) 711 return errmsg; 712 713 /* Done with this operand, continue with next one. */ 714 ++ syn; 715 } 716 717 /* If we're at the end of the syntax string, we're done. */ 718 if (* syn == 0) 719 { 720 /* FIXME: For the moment we assume a valid `str' can only contain 721 blanks now. IE: We needn't try again with a longer version of 722 the insn and it is assumed that longer versions of insns appear 723 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */ 724 while (ISSPACE (* str)) 725 ++ str; 726 727 if (* str != '\0') 728 return _("junk at end of line"); /* FIXME: would like to include `str' */ 729 730 return NULL; 731 } 732 733 /* We couldn't parse it. */ 734 return _("unrecognized instruction"); 735 } 736 737 /* Main entry point. 738 This routine is called for each instruction to be assembled. 739 STR points to the insn to be assembled. 740 We assume all necessary tables have been initialized. 741 The assembled instruction, less any fixups, is stored in BUF. 742 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value 743 still needs to be converted to target byte order, otherwise BUF is an array 744 of bytes in target byte order. 745 The result is a pointer to the insn's entry in the opcode table, 746 or NULL if an error occured (an error message will have already been 747 printed). 748 749 Note that when processing (non-alias) macro-insns, 750 this function recurses. 751 752 ??? It's possible to make this cpu-independent. 753 One would have to deal with a few minor things. 754 At this point in time doing so would be more of a curiosity than useful 755 [for example this file isn't _that_ big], but keeping the possibility in 756 mind helps keep the design clean. */ 757 758 const CGEN_INSN * 759 epiphany_cgen_assemble_insn (CGEN_CPU_DESC cd, 760 const char *str, 761 CGEN_FIELDS *fields, 762 CGEN_INSN_BYTES_PTR buf, 763 char **errmsg) 764 { 765 const char *start; 766 CGEN_INSN_LIST *ilist; 767 const char *parse_errmsg = NULL; 768 const char *insert_errmsg = NULL; 769 int recognized_mnemonic = 0; 770 771 /* Skip leading white space. */ 772 while (ISSPACE (* str)) 773 ++ str; 774 775 /* The instructions are stored in hashed lists. 776 Get the first in the list. */ 777 ilist = CGEN_ASM_LOOKUP_INSN (cd, str); 778 779 /* Keep looking until we find a match. */ 780 start = str; 781 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist)) 782 { 783 const CGEN_INSN *insn = ilist->insn; 784 recognized_mnemonic = 1; 785 786 #ifdef CGEN_VALIDATE_INSN_SUPPORTED 787 /* Not usually needed as unsupported opcodes 788 shouldn't be in the hash lists. */ 789 /* Is this insn supported by the selected cpu? */ 790 if (! epiphany_cgen_insn_supported (cd, insn)) 791 continue; 792 #endif 793 /* If the RELAXED attribute is set, this is an insn that shouldn't be 794 chosen immediately. Instead, it is used during assembler/linker 795 relaxation if possible. */ 796 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0) 797 continue; 798 799 str = start; 800 801 /* Skip this insn if str doesn't look right lexically. */ 802 if (CGEN_INSN_RX (insn) != NULL && 803 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH) 804 continue; 805 806 /* Allow parse/insert handlers to obtain length of insn. */ 807 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn); 808 809 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields); 810 if (parse_errmsg != NULL) 811 continue; 812 813 /* ??? 0 is passed for `pc'. */ 814 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf, 815 (bfd_vma) 0); 816 if (insert_errmsg != NULL) 817 continue; 818 819 /* It is up to the caller to actually output the insn and any 820 queued relocs. */ 821 return insn; 822 } 823 824 { 825 static char errbuf[150]; 826 const char *tmp_errmsg; 827 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS 828 #define be_verbose 1 829 #else 830 #define be_verbose 0 831 #endif 832 833 if (be_verbose) 834 { 835 /* If requesting verbose error messages, use insert_errmsg. 836 Failing that, use parse_errmsg. */ 837 tmp_errmsg = (insert_errmsg ? insert_errmsg : 838 parse_errmsg ? parse_errmsg : 839 recognized_mnemonic ? 840 _("unrecognized form of instruction") : 841 _("unrecognized instruction")); 842 843 if (strlen (start) > 50) 844 /* xgettext:c-format */ 845 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start); 846 else 847 /* xgettext:c-format */ 848 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start); 849 } 850 else 851 { 852 if (strlen (start) > 50) 853 /* xgettext:c-format */ 854 sprintf (errbuf, _("bad instruction `%.50s...'"), start); 855 else 856 /* xgettext:c-format */ 857 sprintf (errbuf, _("bad instruction `%.50s'"), start); 858 } 859 860 *errmsg = errbuf; 861 return NULL; 862 } 863 } 864