1 /* tc-d30v.c -- Assembler code for the Mitsubishi D30V 2 Copyright (C) 1997-2014 Free Software Foundation, Inc. 3 4 This file is part of GAS, the GNU Assembler. 5 6 GAS is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 GAS is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GAS; see the file COPYING. If not, write to 18 the Free Software Foundation, 51 Franklin Street - Fifth Floor, 19 Boston, MA 02110-1301, USA. */ 20 21 #include "as.h" 22 #include "safe-ctype.h" 23 #include "subsegs.h" 24 #include "opcode/d30v.h" 25 #include "dwarf2dbg.h" 26 27 const char comment_chars[] = ";"; 28 const char line_comment_chars[] = "#"; 29 const char line_separator_chars[] = ""; 30 const char *md_shortopts = "OnNcC"; 31 const char EXP_CHARS[] = "eE"; 32 const char FLT_CHARS[] = "dD"; 33 34 #if HAVE_LIMITS_H 35 #include <limits.h> 36 #endif 37 38 #ifndef CHAR_BIT 39 #define CHAR_BIT 8 40 #endif 41 42 #define NOP_MULTIPLY 1 43 #define NOP_ALL 2 44 static int warn_nops = 0; 45 static int Optimizing = 0; 46 static int warn_register_name_conflicts = 1; 47 48 #define FORCE_SHORT 1 49 #define FORCE_LONG 2 50 51 /* EXEC types. */ 52 typedef enum _exec_type 53 { 54 EXEC_UNKNOWN, /* No order specified. */ 55 EXEC_PARALLEL, /* Done in parallel (FM=00). */ 56 EXEC_SEQ, /* Sequential (FM=01). */ 57 EXEC_REVSEQ /* Reverse sequential (FM=10). */ 58 } exec_type_enum; 59 60 /* Fixups. */ 61 #define MAX_INSN_FIXUPS 5 62 63 struct d30v_fixup 64 { 65 expressionS exp; 66 int operand; 67 int pcrel; 68 int size; 69 bfd_reloc_code_real_type reloc; 70 }; 71 72 typedef struct _fixups 73 { 74 int fc; 75 struct d30v_fixup fix[MAX_INSN_FIXUPS]; 76 struct _fixups *next; 77 } Fixups; 78 79 static Fixups FixUps[2]; 80 static Fixups *fixups; 81 82 /* Whether current and previous instruction are word multiply insns. */ 83 static int cur_mul32_p = 0; 84 static int prev_mul32_p = 0; 85 86 /* The flag_explicitly_parallel is true iff the instruction being assembled 87 has been explicitly written as a parallel short-instruction pair by the 88 human programmer. It is used in parallel_ok () to distinguish between 89 those dangerous parallelizations attempted by the human, which are to be 90 allowed, and those attempted by the assembler, which are not. It is set 91 from md_assemble (). */ 92 static int flag_explicitly_parallel = 0; 93 static int flag_xp_state = 0; 94 95 /* Whether current and previous left sub-instruction disables 96 execution of right sub-instruction. */ 97 static int cur_left_kills_right_p = 0; 98 static int prev_left_kills_right_p = 0; 99 100 /* The known current alignment of the current section. */ 101 static int d30v_current_align; 102 static segT d30v_current_align_seg; 103 104 /* The last seen label in the current section. This is used to auto-align 105 labels preceding instructions. */ 106 static symbolS *d30v_last_label; 107 108 /* Two nops. */ 109 #define NOP_LEFT ((long long) NOP << 32) 110 #define NOP_RIGHT ((long long) NOP) 111 #define NOP2 (FM00 | NOP_LEFT | NOP_RIGHT) 112 113 struct option md_longopts[] = 114 { 115 {NULL, no_argument, NULL, 0} 116 }; 117 118 size_t md_longopts_size = sizeof (md_longopts); 119 120 /* Opcode hash table. */ 121 static struct hash_control *d30v_hash; 122 123 /* Do a binary search of the pre_defined_registers array to see if 124 NAME is a valid regiter name. Return the register number from the 125 array on success, or -1 on failure. */ 126 127 static int 128 reg_name_search (char *name) 129 { 130 int middle, low, high; 131 int cmp; 132 133 low = 0; 134 high = reg_name_cnt () - 1; 135 136 do 137 { 138 middle = (low + high) / 2; 139 cmp = strcasecmp (name, pre_defined_registers[middle].name); 140 if (cmp < 0) 141 high = middle - 1; 142 else if (cmp > 0) 143 low = middle + 1; 144 else 145 { 146 if (symbol_find (name) != NULL) 147 { 148 if (warn_register_name_conflicts) 149 as_warn (_("Register name %s conflicts with symbol of the same name"), 150 name); 151 } 152 153 return pre_defined_registers[middle].value; 154 } 155 } 156 while (low <= high); 157 158 return -1; 159 } 160 161 /* Check the string at input_line_pointer to see if it is a valid 162 register name. */ 163 164 static int 165 register_name (expressionS *expressionP) 166 { 167 int reg_number; 168 char c, *p = input_line_pointer; 169 170 while (*p && *p != '\n' && *p != '\r' && *p != ',' && *p != ' ' && *p != ')') 171 p++; 172 173 c = *p; 174 if (c) 175 *p++ = 0; 176 177 /* Look to see if it's in the register table. */ 178 reg_number = reg_name_search (input_line_pointer); 179 if (reg_number >= 0) 180 { 181 expressionP->X_op = O_register; 182 /* Temporarily store a pointer to the string here. */ 183 expressionP->X_op_symbol = (symbolS *) input_line_pointer; 184 expressionP->X_add_number = reg_number; 185 input_line_pointer = p; 186 return 1; 187 } 188 if (c) 189 *(p - 1) = c; 190 return 0; 191 } 192 193 static int 194 check_range (unsigned long num, int bits, int flags) 195 { 196 long min, max; 197 198 /* Don't bother checking 32-bit values. */ 199 if (bits == 32) 200 { 201 if (sizeof (unsigned long) * CHAR_BIT == 32) 202 return 0; 203 204 /* We don't record signed or unsigned for 32-bit quantities. 205 Allow either. */ 206 min = -((unsigned long) 1 << (bits - 1)); 207 max = ((unsigned long) 1 << bits) - 1; 208 return (long) num < min || (long) num > max; 209 } 210 211 if (flags & OPERAND_SHIFT) 212 { 213 /* We know that all shifts are right by three bits. */ 214 num >>= 3; 215 216 if (flags & OPERAND_SIGNED) 217 { 218 unsigned long sign_bit = ((unsigned long) -1L >> 4) + 1; 219 num = (num ^ sign_bit) - sign_bit; 220 } 221 } 222 223 if (flags & OPERAND_SIGNED) 224 { 225 max = ((unsigned long) 1 << (bits - 1)) - 1; 226 min = - ((unsigned long) 1 << (bits - 1)); 227 return (long) num > max || (long) num < min; 228 } 229 else 230 { 231 max = ((unsigned long) 1 << bits) - 1; 232 return num > (unsigned long) max; 233 } 234 } 235 236 void 237 md_show_usage (FILE *stream) 238 { 239 fprintf (stream, _("\nD30V options:\n\ 240 -O Make adjacent short instructions parallel if possible.\n\ 241 -n Warn about all NOPs inserted by the assembler.\n\ 242 -N Warn about NOPs inserted after word multiplies.\n\ 243 -c Warn about symbols whoes names match register names.\n\ 244 -C Opposite of -C. -c is the default.\n")); 245 } 246 247 int 248 md_parse_option (int c, char *arg ATTRIBUTE_UNUSED) 249 { 250 switch (c) 251 { 252 /* Optimize. Will attempt to parallelize operations. */ 253 case 'O': 254 Optimizing = 1; 255 break; 256 257 /* Warn about all NOPS that the assembler inserts. */ 258 case 'n': 259 warn_nops = NOP_ALL; 260 break; 261 262 /* Warn about the NOPS that the assembler inserts because of the 263 multiply hazard. */ 264 case 'N': 265 warn_nops = NOP_MULTIPLY; 266 break; 267 268 case 'c': 269 warn_register_name_conflicts = 1; 270 break; 271 272 case 'C': 273 warn_register_name_conflicts = 0; 274 break; 275 276 default: 277 return 0; 278 } 279 return 1; 280 } 281 282 symbolS * 283 md_undefined_symbol (char *name ATTRIBUTE_UNUSED) 284 { 285 return 0; 286 } 287 288 char * 289 md_atof (int type, char *litP, int *sizeP) 290 { 291 return ieee_md_atof (type, litP, sizeP, TRUE); 292 } 293 294 void 295 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, 296 asection *sec ATTRIBUTE_UNUSED, 297 fragS *fragP ATTRIBUTE_UNUSED) 298 { 299 abort (); 300 } 301 302 valueT 303 md_section_align (asection *seg, valueT addr) 304 { 305 int align = bfd_get_section_alignment (stdoutput, seg); 306 return ((addr + (1 << align) - 1) & (-1 << align)); 307 } 308 309 void 310 md_begin (void) 311 { 312 struct d30v_opcode *opcode; 313 d30v_hash = hash_new (); 314 315 /* Insert opcode names into a hash table. */ 316 for (opcode = (struct d30v_opcode *) d30v_opcode_table; opcode->name; opcode++) 317 hash_insert (d30v_hash, opcode->name, (char *) opcode); 318 319 fixups = &FixUps[0]; 320 FixUps[0].next = &FixUps[1]; 321 FixUps[1].next = &FixUps[0]; 322 323 d30v_current_align_seg = now_seg; 324 } 325 326 /* Remove the postincrement or postdecrement operator ( '+' or '-' ) 327 from an expression. */ 328 329 static int 330 postfix (char *p) 331 { 332 while (*p != '-' && *p != '+') 333 { 334 if (*p == 0 || *p == '\n' || *p == '\r' || *p == ' ' || *p == ',') 335 break; 336 p++; 337 } 338 339 if (*p == '-') 340 { 341 *p = ' '; 342 return -1; 343 } 344 345 if (*p == '+') 346 { 347 *p = ' '; 348 return 1; 349 } 350 351 return 0; 352 } 353 354 static bfd_reloc_code_real_type 355 get_reloc (const struct d30v_operand *op, int rel_flag) 356 { 357 switch (op->bits) 358 { 359 case 6: 360 if (op->flags & OPERAND_SHIFT) 361 return BFD_RELOC_D30V_9_PCREL; 362 else 363 return BFD_RELOC_D30V_6; 364 break; 365 case 12: 366 if (!(op->flags & OPERAND_SHIFT)) 367 as_warn (_("unexpected 12-bit reloc type")); 368 if (rel_flag == RELOC_PCREL) 369 return BFD_RELOC_D30V_15_PCREL; 370 else 371 return BFD_RELOC_D30V_15; 372 case 18: 373 if (!(op->flags & OPERAND_SHIFT)) 374 as_warn (_("unexpected 18-bit reloc type")); 375 if (rel_flag == RELOC_PCREL) 376 return BFD_RELOC_D30V_21_PCREL; 377 else 378 return BFD_RELOC_D30V_21; 379 case 32: 380 if (rel_flag == RELOC_PCREL) 381 return BFD_RELOC_D30V_32_PCREL; 382 else 383 return BFD_RELOC_D30V_32; 384 default: 385 return 0; 386 } 387 } 388 389 /* Parse a string of operands and return an array of expressions. */ 390 391 static int 392 get_operands (expressionS exp[], int cmp_hack) 393 { 394 char *p = input_line_pointer; 395 int numops = 0; 396 int post = 0; 397 398 if (cmp_hack) 399 { 400 exp[numops].X_op = O_absent; 401 exp[numops++].X_add_number = cmp_hack - 1; 402 } 403 404 while (*p) 405 { 406 while (*p == ' ' || *p == '\t' || *p == ',') 407 p++; 408 409 if (*p == 0 || *p == '\n' || *p == '\r') 410 break; 411 412 if (*p == '@') 413 { 414 p++; 415 exp[numops].X_op = O_absent; 416 if (*p == '(') 417 { 418 p++; 419 exp[numops].X_add_number = OPERAND_ATPAR; 420 post = postfix (p); 421 } 422 else if (*p == '-') 423 { 424 p++; 425 exp[numops].X_add_number = OPERAND_ATMINUS; 426 } 427 else 428 { 429 exp[numops].X_add_number = OPERAND_ATSIGN; 430 post = postfix (p); 431 } 432 numops++; 433 continue; 434 } 435 436 if (*p == ')') 437 { 438 /* Just skip the trailing paren. */ 439 p++; 440 continue; 441 } 442 443 input_line_pointer = p; 444 445 /* Check to see if it might be a register name. */ 446 if (!register_name (&exp[numops])) 447 { 448 /* Parse as an expression. */ 449 expression (&exp[numops]); 450 } 451 452 if (exp[numops].X_op == O_illegal) 453 as_bad (_("illegal operand")); 454 else if (exp[numops].X_op == O_absent) 455 as_bad (_("missing operand")); 456 457 numops++; 458 p = input_line_pointer; 459 460 switch (post) 461 { 462 case -1: 463 /* Postdecrement mode. */ 464 exp[numops].X_op = O_absent; 465 exp[numops++].X_add_number = OPERAND_MINUS; 466 break; 467 case 1: 468 /* Postincrement mode. */ 469 exp[numops].X_op = O_absent; 470 exp[numops++].X_add_number = OPERAND_PLUS; 471 break; 472 } 473 post = 0; 474 } 475 476 exp[numops].X_op = 0; 477 478 return numops; 479 } 480 481 /* Generate the instruction. 482 It does everything but write the FM bits. */ 483 484 static long long 485 build_insn (struct d30v_insn *opcode, expressionS *opers) 486 { 487 int i, bits, shift, flags; 488 unsigned long number, id = 0; 489 long long insn; 490 struct d30v_opcode *op = opcode->op; 491 struct d30v_format *form = opcode->form; 492 493 insn = 494 opcode->ecc << 28 | op->op1 << 25 | op->op2 << 20 | form->modifier << 18; 495 496 for (i = 0; form->operands[i]; i++) 497 { 498 flags = d30v_operand_table[form->operands[i]].flags; 499 500 /* Must be a register or number. */ 501 if (!(flags & OPERAND_REG) && !(flags & OPERAND_NUM) 502 && !(flags & OPERAND_NAME) && !(flags & OPERAND_SPECIAL)) 503 continue; 504 505 bits = d30v_operand_table[form->operands[i]].bits; 506 if (flags & OPERAND_SHIFT) 507 bits += 3; 508 509 shift = 12 - d30v_operand_table[form->operands[i]].position; 510 if (opers[i].X_op != O_symbol) 511 number = opers[i].X_add_number; 512 else 513 number = 0; 514 if (flags & OPERAND_REG) 515 { 516 /* Check for mvfsys or mvtsys control registers. */ 517 if (flags & OPERAND_CONTROL && (number & 0x7f) > MAX_CONTROL_REG) 518 { 519 /* PSWL or PSWH. */ 520 id = (number & 0x7f) - MAX_CONTROL_REG; 521 number = 0; 522 } 523 else if (number & OPERAND_FLAG) 524 /* NUMBER is a flag register. */ 525 id = 3; 526 527 number &= 0x7F; 528 } 529 else if (flags & OPERAND_SPECIAL) 530 number = id; 531 532 if (opers[i].X_op != O_register && opers[i].X_op != O_constant 533 && !(flags & OPERAND_NAME)) 534 { 535 /* Now create a fixup. */ 536 if (fixups->fc >= MAX_INSN_FIXUPS) 537 as_fatal (_("too many fixups")); 538 539 fixups->fix[fixups->fc].reloc = 540 get_reloc (d30v_operand_table + form->operands[i], op->reloc_flag); 541 fixups->fix[fixups->fc].size = 4; 542 fixups->fix[fixups->fc].exp = opers[i]; 543 fixups->fix[fixups->fc].operand = form->operands[i]; 544 if (fixups->fix[fixups->fc].reloc == BFD_RELOC_D30V_9_PCREL) 545 fixups->fix[fixups->fc].pcrel = RELOC_PCREL; 546 else 547 fixups->fix[fixups->fc].pcrel = op->reloc_flag; 548 (fixups->fc)++; 549 } 550 551 /* Truncate to the proper number of bits. */ 552 if ((opers[i].X_op == O_constant) && check_range (number, bits, flags)) 553 as_bad (_("operand out of range: %ld"), number); 554 if (bits < 31) 555 number &= 0x7FFFFFFF >> (31 - bits); 556 if (flags & OPERAND_SHIFT) 557 number >>= 3; 558 if (bits == 32) 559 { 560 /* It's a LONG instruction. */ 561 insn |= ((number & 0xffffffff) >> 26); /* Top 6 bits. */ 562 insn <<= 32; /* Shift the first word over. */ 563 insn |= ((number & 0x03FC0000) << 2); /* Next 8 bits. */ 564 insn |= number & 0x0003FFFF; /* Bottom 18 bits. */ 565 } 566 else 567 insn |= number << shift; 568 } 569 570 return insn; 571 } 572 573 static void 574 d30v_number_to_chars (char *buf, /* Return 'nbytes' of chars here. */ 575 long long value, /* The value of the bits. */ 576 int n) /* Number of bytes in the output. */ 577 { 578 while (n--) 579 { 580 buf[n] = value & 0xff; 581 value >>= 8; 582 } 583 } 584 585 /* Write out a long form instruction. */ 586 587 static void 588 write_long (struct d30v_insn *opcode ATTRIBUTE_UNUSED, 589 long long insn, 590 Fixups *fx) 591 { 592 int i, where; 593 char *f = frag_more (8); 594 595 dwarf2_emit_insn (8); 596 insn |= FM11; 597 d30v_number_to_chars (f, insn, 8); 598 599 for (i = 0; i < fx->fc; i++) 600 { 601 if (fx->fix[i].reloc) 602 { 603 where = f - frag_now->fr_literal; 604 fix_new_exp (frag_now, where, fx->fix[i].size, &(fx->fix[i].exp), 605 fx->fix[i].pcrel, fx->fix[i].reloc); 606 } 607 } 608 609 fx->fc = 0; 610 } 611 612 /* Write out a short form instruction by itself. */ 613 614 static void 615 write_1_short (struct d30v_insn *opcode, 616 long long insn, 617 Fixups *fx, 618 int use_sequential) 619 { 620 char *f = frag_more (8); 621 int i, where; 622 623 dwarf2_emit_insn (8); 624 if (warn_nops == NOP_ALL) 625 as_warn (_("%s NOP inserted"), use_sequential ? 626 _("sequential") : _("parallel")); 627 628 /* The other container needs to be NOP. */ 629 if (use_sequential) 630 { 631 /* Use a sequential NOP rather than a parallel one, 632 as the current instruction is a FLAG_MUL32 type one 633 and the next instruction is a load. */ 634 635 /* According to 4.3.1: for FM=01, sub-instructions performed 636 only by IU cannot be encoded in L-container. */ 637 if (opcode->op->unit == IU) 638 /* Right then left. */ 639 insn |= FM10 | NOP_LEFT; 640 else 641 /* Left then right. */ 642 insn = FM01 | (insn << 32) | NOP_RIGHT; 643 } 644 else 645 { 646 /* According to 4.3.1: for FM=00, sub-instructions performed 647 only by IU cannot be encoded in L-container. */ 648 if (opcode->op->unit == IU) 649 /* Right container. */ 650 insn |= FM00 | NOP_LEFT; 651 else 652 /* Left container. */ 653 insn = FM00 | (insn << 32) | NOP_RIGHT; 654 } 655 656 d30v_number_to_chars (f, insn, 8); 657 658 for (i = 0; i < fx->fc; i++) 659 { 660 if (fx->fix[i].reloc) 661 { 662 where = f - frag_now->fr_literal; 663 fix_new_exp (frag_now, 664 where, 665 fx->fix[i].size, 666 &(fx->fix[i].exp), 667 fx->fix[i].pcrel, 668 fx->fix[i].reloc); 669 } 670 } 671 672 fx->fc = 0; 673 } 674 675 /* Check 2 instructions and determine if they can be safely 676 executed in parallel. Return 1 if they can be. */ 677 678 static int 679 parallel_ok (struct d30v_insn *op1, 680 unsigned long insn1, 681 struct d30v_insn *op2, 682 unsigned long insn2, 683 exec_type_enum exec_type) 684 { 685 int i, j, shift, regno, bits, ecc; 686 unsigned long flags, mask, flags_set1, flags_set2, flags_used1, flags_used2; 687 unsigned long ins, mod_reg[2][3], used_reg[2][3], flag_reg[2]; 688 struct d30v_format *f; 689 struct d30v_opcode *op; 690 691 /* Section 4.3: Both instructions must not be IU or MU only. */ 692 if ((op1->op->unit == IU && op2->op->unit == IU) 693 || (op1->op->unit == MU && op2->op->unit == MU)) 694 return 0; 695 696 /* First instruction must not be a jump to safely optimize, unless this 697 is an explicit parallel operation. */ 698 if (exec_type != EXEC_PARALLEL 699 && (op1->op->flags_used & (FLAG_JMP | FLAG_JSR))) 700 return 0; 701 702 /* If one instruction is /TX or /XT and the other is /FX or /XF respectively, 703 then it is safe to allow the two to be done as parallel ops, since only 704 one will ever be executed at a time. */ 705 if ((op1->ecc == ECC_TX && op2->ecc == ECC_FX) 706 || (op1->ecc == ECC_FX && op2->ecc == ECC_TX) 707 || (op1->ecc == ECC_XT && op2->ecc == ECC_XF) 708 || (op1->ecc == ECC_XF && op2->ecc == ECC_XT)) 709 return 1; 710 711 /* [0] r0-r31 712 [1] r32-r63 713 [2] a0, a1, flag registers. */ 714 for (j = 0; j < 2; j++) 715 { 716 if (j == 0) 717 { 718 f = op1->form; 719 op = op1->op; 720 ecc = op1->ecc; 721 ins = insn1; 722 } 723 else 724 { 725 f = op2->form; 726 op = op2->op; 727 ecc = op2->ecc; 728 ins = insn2; 729 } 730 731 flag_reg[j] = 0; 732 mod_reg[j][0] = mod_reg[j][1] = 0; 733 used_reg[j][0] = used_reg[j][1] = 0; 734 735 if (flag_explicitly_parallel) 736 { 737 /* For human specified parallel instructions we have been asked 738 to ignore the possibility that both instructions could modify 739 bits in the PSW, so we initialise the mod & used arrays to 0. 740 We have been asked, however, to refuse to allow parallel 741 instructions which explicitly set the same flag register, 742 eg "cmpne f0,r1,0x10 || cmpeq f0, r5, 0x2", so further on we test 743 for the use of a flag register and set a bit in the mod or used 744 array appropriately. */ 745 mod_reg[j][2] = 0; 746 used_reg[j][2] = 0; 747 } 748 else 749 { 750 mod_reg[j][2] = (op->flags_set & FLAG_ALL); 751 used_reg[j][2] = (op->flags_used & FLAG_ALL); 752 } 753 754 /* BSR/JSR always sets R62. */ 755 if (op->flags_used & FLAG_JSR) 756 mod_reg[j][1] = (1L << (62 - 32)); 757 758 /* Conditional execution affects the flags_used. */ 759 switch (ecc) 760 { 761 case ECC_TX: 762 case ECC_FX: 763 used_reg[j][2] |= flag_reg[j] = FLAG_0; 764 break; 765 766 case ECC_XT: 767 case ECC_XF: 768 used_reg[j][2] |= flag_reg[j] = FLAG_1; 769 break; 770 771 case ECC_TT: 772 case ECC_TF: 773 used_reg[j][2] |= flag_reg[j] = (FLAG_0 | FLAG_1); 774 break; 775 } 776 777 for (i = 0; f->operands[i]; i++) 778 { 779 flags = d30v_operand_table[f->operands[i]].flags; 780 shift = 12 - d30v_operand_table[f->operands[i]].position; 781 bits = d30v_operand_table[f->operands[i]].bits; 782 if (bits == 32) 783 mask = 0xffffffff; 784 else 785 mask = 0x7FFFFFFF >> (31 - bits); 786 787 if ((flags & OPERAND_PLUS) || (flags & OPERAND_MINUS)) 788 { 789 /* This is a post-increment or post-decrement. 790 The previous register needs to be marked as modified. */ 791 shift = 12 - d30v_operand_table[f->operands[i - 1]].position; 792 regno = (ins >> shift) & 0x3f; 793 if (regno >= 32) 794 mod_reg[j][1] |= 1L << (regno - 32); 795 else 796 mod_reg[j][0] |= 1L << regno; 797 } 798 else if (flags & OPERAND_REG) 799 { 800 regno = (ins >> shift) & mask; 801 /* The memory write functions don't have a destination 802 register. */ 803 if ((flags & OPERAND_DEST) && !(op->flags_set & FLAG_MEM)) 804 { 805 /* MODIFIED registers and flags. */ 806 if (flags & OPERAND_ACC) 807 { 808 if (regno == 0) 809 mod_reg[j][2] |= FLAG_A0; 810 else if (regno == 1) 811 mod_reg[j][2] |= FLAG_A1; 812 else 813 abort (); 814 } 815 else if (flags & OPERAND_FLAG) 816 mod_reg[j][2] |= 1L << regno; 817 else if (!(flags & OPERAND_CONTROL)) 818 { 819 int r, z; 820 821 /* Need to check if there are two destination 822 registers, for example ld2w. */ 823 if (flags & OPERAND_2REG) 824 z = 1; 825 else 826 z = 0; 827 828 for (r = regno; r <= regno + z; r++) 829 { 830 if (r >= 32) 831 mod_reg[j][1] |= 1L << (r - 32); 832 else 833 mod_reg[j][0] |= 1L << r; 834 } 835 } 836 } 837 else 838 { 839 /* USED, but not modified registers and flags. */ 840 if (flags & OPERAND_ACC) 841 { 842 if (regno == 0) 843 used_reg[j][2] |= FLAG_A0; 844 else if (regno == 1) 845 used_reg[j][2] |= FLAG_A1; 846 else 847 abort (); 848 } 849 else if (flags & OPERAND_FLAG) 850 used_reg[j][2] |= 1L << regno; 851 else if (!(flags & OPERAND_CONTROL)) 852 { 853 int r, z; 854 855 /* Need to check if there are two source 856 registers, for example st2w. */ 857 if (flags & OPERAND_2REG) 858 z = 1; 859 else 860 z = 0; 861 862 for (r = regno; r <= regno + z; r++) 863 { 864 if (r >= 32) 865 used_reg[j][1] |= 1L << (r - 32); 866 else 867 used_reg[j][0] |= 1L << r; 868 } 869 } 870 } 871 } 872 } 873 } 874 875 flags_set1 = op1->op->flags_set; 876 flags_set2 = op2->op->flags_set; 877 flags_used1 = op1->op->flags_used; 878 flags_used2 = op2->op->flags_used; 879 880 /* Check for illegal combinations with ADDppp/SUBppp. */ 881 if (((flags_set1 & FLAG_NOT_WITH_ADDSUBppp) != 0 882 && (flags_used2 & FLAG_ADDSUBppp) != 0) 883 || ((flags_set2 & FLAG_NOT_WITH_ADDSUBppp) != 0 884 && (flags_used1 & FLAG_ADDSUBppp) != 0)) 885 return 0; 886 887 /* Load instruction combined with half-word multiply is illegal. */ 888 if (((flags_used1 & FLAG_MEM) != 0 && (flags_used2 & FLAG_MUL16)) 889 || ((flags_used2 & FLAG_MEM) != 0 && (flags_used1 & FLAG_MUL16))) 890 return 0; 891 892 /* Specifically allow add || add by removing carry, overflow bits dependency. 893 This is safe, even if an addc follows since the IU takes the argument in 894 the right container, and it writes its results last. 895 However, don't paralellize add followed by addc or sub followed by 896 subb. */ 897 if (mod_reg[0][2] == FLAG_CVVA && mod_reg[1][2] == FLAG_CVVA 898 && (used_reg[0][2] & ~flag_reg[0]) == 0 899 && (used_reg[1][2] & ~flag_reg[1]) == 0 900 && op1->op->unit == EITHER && op2->op->unit == EITHER) 901 { 902 mod_reg[0][2] = mod_reg[1][2] = 0; 903 } 904 905 for (j = 0; j < 3; j++) 906 { 907 /* If the second instruction depends on the first, we obviously 908 cannot parallelize. Note, the mod flag implies use, so 909 check that as well. */ 910 /* If flag_explicitly_parallel is set, then the case of the 911 second instruction using a register the first instruction 912 modifies is assumed to be okay; we trust the human. We 913 don't trust the human if both instructions modify the same 914 register but we do trust the human if they modify the same 915 flags. */ 916 /* We have now been requested not to trust the human if the 917 instructions modify the same flag registers either. */ 918 if (flag_explicitly_parallel) 919 { 920 if ((mod_reg[0][j] & mod_reg[1][j]) != 0) 921 return 0; 922 } 923 else 924 if ((mod_reg[0][j] & (mod_reg[1][j] | used_reg[1][j])) != 0) 925 return 0; 926 } 927 928 return 1; 929 } 930 931 /* Write out a short form instruction if possible. 932 Return number of instructions not written out. */ 933 934 static int 935 write_2_short (struct d30v_insn *opcode1, 936 long long insn1, 937 struct d30v_insn *opcode2, 938 long long insn2, 939 exec_type_enum exec_type, 940 Fixups *fx) 941 { 942 long long insn = NOP2; 943 char *f; 944 int i, j, where; 945 946 if (exec_type == EXEC_SEQ 947 && (opcode1->op->flags_used & (FLAG_JMP | FLAG_JSR)) 948 && ((opcode1->op->flags_used & FLAG_DELAY) == 0) 949 && ((opcode1->ecc == ECC_AL) || ! Optimizing)) 950 { 951 /* Unconditional, non-delayed branches kill instructions in 952 the right bin. Conditional branches don't always but if 953 we are not optimizing, then we have been asked to produce 954 an error about such constructs. For the purposes of this 955 test, subroutine calls are considered to be branches. */ 956 write_1_short (opcode1, insn1, fx->next, FALSE); 957 return 1; 958 } 959 960 /* Note: we do not have to worry about subroutine calls occurring 961 in the right hand container. The return address is always 962 aligned to the next 64 bit boundary, be that 64 or 32 bit away. */ 963 switch (exec_type) 964 { 965 case EXEC_UNKNOWN: /* Order not specified. */ 966 if (Optimizing 967 && parallel_ok (opcode1, insn1, opcode2, insn2, exec_type) 968 && ! ( (opcode1->op->unit == EITHER_BUT_PREFER_MU 969 || opcode1->op->unit == MU) 970 && 971 ( opcode2->op->unit == EITHER_BUT_PREFER_MU 972 || opcode2->op->unit == MU))) 973 { 974 /* Parallel. */ 975 exec_type = EXEC_PARALLEL; 976 977 if (opcode1->op->unit == IU 978 || opcode2->op->unit == MU 979 || opcode2->op->unit == EITHER_BUT_PREFER_MU) 980 insn = FM00 | (insn2 << 32) | insn1; 981 else 982 { 983 insn = FM00 | (insn1 << 32) | insn2; 984 fx = fx->next; 985 } 986 } 987 else if ((opcode1->op->flags_used & (FLAG_JMP | FLAG_JSR) 988 && ((opcode1->op->flags_used & FLAG_DELAY) == 0)) 989 || opcode1->op->flags_used & FLAG_RP) 990 { 991 /* We must emit (non-delayed) branch type instructions 992 on their own with nothing in the right container. */ 993 /* We must treat repeat instructions likewise, since the 994 following instruction has to be separate from the repeat 995 in order to be repeated. */ 996 write_1_short (opcode1, insn1, fx->next, FALSE); 997 return 1; 998 } 999 else if (prev_left_kills_right_p) 1000 { 1001 /* The left instruction kils the right slot, so we 1002 must leave it empty. */ 1003 write_1_short (opcode1, insn1, fx->next, FALSE); 1004 return 1; 1005 } 1006 else if (opcode1->op->unit == IU) 1007 { 1008 if (opcode2->op->unit == EITHER_BUT_PREFER_MU) 1009 { 1010 /* Case 103810 is a request from Mitsubishi that opcodes 1011 with EITHER_BUT_PREFER_MU should not be executed in 1012 reverse sequential order. */ 1013 write_1_short (opcode1, insn1, fx->next, FALSE); 1014 return 1; 1015 } 1016 1017 /* Reverse sequential. */ 1018 insn = FM10 | (insn2 << 32) | insn1; 1019 exec_type = EXEC_REVSEQ; 1020 } 1021 else 1022 { 1023 /* Sequential. */ 1024 insn = FM01 | (insn1 << 32) | insn2; 1025 fx = fx->next; 1026 exec_type = EXEC_SEQ; 1027 } 1028 break; 1029 1030 case EXEC_PARALLEL: /* Parallel. */ 1031 flag_explicitly_parallel = flag_xp_state; 1032 if (! parallel_ok (opcode1, insn1, opcode2, insn2, exec_type)) 1033 as_bad (_("Instructions may not be executed in parallel")); 1034 else if (opcode1->op->unit == IU) 1035 { 1036 if (opcode2->op->unit == IU) 1037 as_bad (_("Two IU instructions may not be executed in parallel")); 1038 as_warn (_("Swapping instruction order")); 1039 insn = FM00 | (insn2 << 32) | insn1; 1040 } 1041 else if (opcode2->op->unit == MU) 1042 { 1043 if (opcode1->op->unit == MU) 1044 as_bad (_("Two MU instructions may not be executed in parallel")); 1045 else if (opcode1->op->unit == EITHER_BUT_PREFER_MU) 1046 as_warn (_("Executing %s in IU may not work"), opcode1->op->name); 1047 as_warn (_("Swapping instruction order")); 1048 insn = FM00 | (insn2 << 32) | insn1; 1049 } 1050 else 1051 { 1052 if (opcode2->op->unit == EITHER_BUT_PREFER_MU) 1053 as_warn (_("Executing %s in IU may not work in parallel execution"), 1054 opcode2->op->name); 1055 1056 insn = FM00 | (insn1 << 32) | insn2; 1057 fx = fx->next; 1058 } 1059 flag_explicitly_parallel = 0; 1060 break; 1061 1062 case EXEC_SEQ: /* Sequential. */ 1063 if (opcode1->op->unit == IU) 1064 as_bad (_("IU instruction may not be in the left container")); 1065 if (prev_left_kills_right_p) 1066 as_bad (_("special left instruction `%s' kills instruction " 1067 "`%s' in right container"), 1068 opcode1->op->name, opcode2->op->name); 1069 insn = FM01 | (insn1 << 32) | insn2; 1070 fx = fx->next; 1071 break; 1072 1073 case EXEC_REVSEQ: /* Reverse sequential. */ 1074 if (opcode2->op->unit == MU) 1075 as_bad (_("MU instruction may not be in the right container")); 1076 if (opcode1->op->unit == EITHER_BUT_PREFER_MU) 1077 as_warn (_("Executing %s in reverse serial with %s may not work"), 1078 opcode1->op->name, opcode2->op->name); 1079 else if (opcode2->op->unit == EITHER_BUT_PREFER_MU) 1080 as_warn (_("Executing %s in IU in reverse serial may not work"), 1081 opcode2->op->name); 1082 insn = FM10 | (insn1 << 32) | insn2; 1083 fx = fx->next; 1084 break; 1085 1086 default: 1087 as_fatal (_("unknown execution type passed to write_2_short()")); 1088 } 1089 1090 f = frag_more (8); 1091 dwarf2_emit_insn (8); 1092 d30v_number_to_chars (f, insn, 8); 1093 1094 /* If the previous instruction was a 32-bit multiply but it is put into a 1095 parallel container, mark the current instruction as being a 32-bit 1096 multiply. */ 1097 if (prev_mul32_p && exec_type == EXEC_PARALLEL) 1098 cur_mul32_p = 1; 1099 1100 for (j = 0; j < 2; j++) 1101 { 1102 for (i = 0; i < fx->fc; i++) 1103 { 1104 if (fx->fix[i].reloc) 1105 { 1106 where = (f - frag_now->fr_literal) + 4 * j; 1107 1108 fix_new_exp (frag_now, 1109 where, 1110 fx->fix[i].size, 1111 &(fx->fix[i].exp), 1112 fx->fix[i].pcrel, 1113 fx->fix[i].reloc); 1114 } 1115 } 1116 1117 fx->fc = 0; 1118 fx = fx->next; 1119 } 1120 1121 return 0; 1122 } 1123 1124 /* Get a pointer to an entry in the format table. 1125 It must look at all formats for an opcode and use the operands 1126 to choose the correct one. Return NULL on error. */ 1127 1128 static struct d30v_format * 1129 find_format (struct d30v_opcode *opcode, 1130 expressionS myops[], 1131 int fsize, 1132 int cmp_hack) 1133 { 1134 int match, opcode_index, i = 0, j, k; 1135 struct d30v_format *fm; 1136 1137 if (opcode == NULL) 1138 return NULL; 1139 1140 /* Get all the operands and save them as expressions. */ 1141 get_operands (myops, cmp_hack); 1142 1143 while ((opcode_index = opcode->format[i++]) != 0) 1144 { 1145 if (fsize == FORCE_SHORT && opcode_index >= LONG) 1146 continue; 1147 1148 if (fsize == FORCE_LONG && opcode_index < LONG) 1149 continue; 1150 1151 fm = (struct d30v_format *) &d30v_format_table[opcode_index]; 1152 k = opcode_index; 1153 while (fm->form == opcode_index) 1154 { 1155 match = 1; 1156 /* Now check the operands for compatibility. */ 1157 for (j = 0; match && fm->operands[j]; j++) 1158 { 1159 int flags = d30v_operand_table[fm->operands[j]].flags; 1160 int bits = d30v_operand_table[fm->operands[j]].bits; 1161 int X_op = myops[j].X_op; 1162 int num = myops[j].X_add_number; 1163 1164 if (flags & OPERAND_SPECIAL) 1165 break; 1166 else if (X_op == O_illegal) 1167 match = 0; 1168 else if (flags & OPERAND_REG) 1169 { 1170 if (X_op != O_register 1171 || ((flags & OPERAND_ACC) && !(num & OPERAND_ACC)) 1172 || (!(flags & OPERAND_ACC) && (num & OPERAND_ACC)) 1173 || ((flags & OPERAND_FLAG) && !(num & OPERAND_FLAG)) 1174 || (!(flags & (OPERAND_FLAG | OPERAND_CONTROL)) && (num & OPERAND_FLAG)) 1175 || ((flags & OPERAND_CONTROL) 1176 && !(num & (OPERAND_CONTROL | OPERAND_FLAG)))) 1177 match = 0; 1178 } 1179 else if (((flags & OPERAND_MINUS) 1180 && (X_op != O_absent || num != OPERAND_MINUS)) 1181 || ((flags & OPERAND_PLUS) 1182 && (X_op != O_absent || num != OPERAND_PLUS)) 1183 || ((flags & OPERAND_ATMINUS) 1184 && (X_op != O_absent || num != OPERAND_ATMINUS)) 1185 || ((flags & OPERAND_ATPAR) 1186 && (X_op != O_absent || num != OPERAND_ATPAR)) 1187 || ((flags & OPERAND_ATSIGN) 1188 && (X_op != O_absent || num != OPERAND_ATSIGN))) 1189 match = 0; 1190 else if (flags & OPERAND_NUM) 1191 { 1192 /* A number can be a constant or symbol expression. */ 1193 1194 /* If we have found a register name, but that name 1195 also matches a symbol, then re-parse the name as 1196 an expression. */ 1197 if (X_op == O_register 1198 && symbol_find ((char *) myops[j].X_op_symbol)) 1199 { 1200 input_line_pointer = (char *) myops[j].X_op_symbol; 1201 expression (&myops[j]); 1202 } 1203 1204 /* Turn an expression into a symbol for later resolution. */ 1205 if (X_op != O_absent && X_op != O_constant 1206 && X_op != O_symbol && X_op != O_register 1207 && X_op != O_big) 1208 { 1209 symbolS *sym = make_expr_symbol (&myops[j]); 1210 myops[j].X_op = X_op = O_symbol; 1211 myops[j].X_add_symbol = sym; 1212 myops[j].X_add_number = num = 0; 1213 } 1214 1215 if (fm->form >= LONG) 1216 { 1217 /* If we're testing for a LONG format, either fits. */ 1218 if (X_op != O_constant && X_op != O_symbol) 1219 match = 0; 1220 } 1221 else if (fm->form < LONG 1222 && ((fsize == FORCE_SHORT && X_op == O_symbol) 1223 || (fm->form == SHORT_D2 && j == 0))) 1224 match = 1; 1225 1226 /* This is the tricky part. Will the constant or symbol 1227 fit into the space in the current format? */ 1228 else if (X_op == O_constant) 1229 { 1230 if (check_range (num, bits, flags)) 1231 match = 0; 1232 } 1233 else if (X_op == O_symbol 1234 && S_IS_DEFINED (myops[j].X_add_symbol) 1235 && S_GET_SEGMENT (myops[j].X_add_symbol) == now_seg 1236 && opcode->reloc_flag == RELOC_PCREL) 1237 { 1238 /* If the symbol is defined, see if the value will fit 1239 into the form we're considering. */ 1240 fragS *f; 1241 long value; 1242 1243 /* Calculate the current address by running through the 1244 previous frags and adding our current offset. */ 1245 value = frag_now_fix_octets (); 1246 for (f = frchain_now->frch_root; f; f = f->fr_next) 1247 value += f->fr_fix + f->fr_offset; 1248 value = S_GET_VALUE (myops[j].X_add_symbol) - value; 1249 if (check_range (value, bits, flags)) 1250 match = 0; 1251 } 1252 else 1253 match = 0; 1254 } 1255 } 1256 /* We're only done if the operands matched so far AND there 1257 are no more to check. */ 1258 if (match && myops[j].X_op == 0) 1259 { 1260 /* Final check - issue a warning if an odd numbered register 1261 is used as the first register in an instruction that reads 1262 or writes 2 registers. */ 1263 1264 for (j = 0; fm->operands[j]; j++) 1265 if (myops[j].X_op == O_register 1266 && (myops[j].X_add_number & 1) 1267 && (d30v_operand_table[fm->operands[j]].flags & OPERAND_2REG)) 1268 as_warn (_("Odd numbered register used as target of multi-register instruction")); 1269 1270 return fm; 1271 } 1272 fm = (struct d30v_format *) &d30v_format_table[++k]; 1273 } 1274 } 1275 return NULL; 1276 } 1277 1278 /* Assemble a single instruction and return an opcode. 1279 Return -1 (an invalid opcode) on error. */ 1280 1281 #define NAME_BUF_LEN 20 1282 1283 static long long 1284 do_assemble (char *str, 1285 struct d30v_insn *opcode, 1286 int shortp, 1287 int is_parallel) 1288 { 1289 char *op_start; 1290 char *save; 1291 char *op_end; 1292 char name[NAME_BUF_LEN]; 1293 int cmp_hack; 1294 int nlen = 0; 1295 int fsize = (shortp ? FORCE_SHORT : 0); 1296 expressionS myops[6]; 1297 long long insn; 1298 1299 /* Drop leading whitespace. */ 1300 while (*str == ' ') 1301 str++; 1302 1303 /* Find the opcode end. */ 1304 for (op_start = op_end = str; 1305 *op_end 1306 && nlen < (NAME_BUF_LEN - 1) 1307 && *op_end != '/' 1308 && !is_end_of_line[(unsigned char) *op_end] && *op_end != ' '; 1309 op_end++) 1310 { 1311 name[nlen] = TOLOWER (op_start[nlen]); 1312 nlen++; 1313 } 1314 1315 if (nlen == 0) 1316 return -1; 1317 1318 name[nlen] = 0; 1319 1320 /* If there is an execution condition code, handle it. */ 1321 if (*op_end == '/') 1322 { 1323 int i = 0; 1324 while ((i < ECC_MAX) && strncasecmp (d30v_ecc_names[i], op_end + 1, 2)) 1325 i++; 1326 1327 if (i == ECC_MAX) 1328 { 1329 char tmp[4]; 1330 strncpy (tmp, op_end + 1, 2); 1331 tmp[2] = 0; 1332 as_bad (_("unknown condition code: %s"), tmp); 1333 return -1; 1334 } 1335 opcode->ecc = i; 1336 op_end += 3; 1337 } 1338 else 1339 opcode->ecc = ECC_AL; 1340 1341 /* CMP and CMPU change their name based on condition codes. */ 1342 if (!strncmp (name, "cmp", 3)) 1343 { 1344 int p, i; 1345 char **d30v_str = (char **) d30v_cc_names; 1346 1347 if (name[3] == 'u') 1348 p = 4; 1349 else 1350 p = 3; 1351 1352 for (i = 1; *d30v_str && strncmp (*d30v_str, &name[p], 2); i++, d30v_str++) 1353 ; 1354 1355 /* cmpu only supports some condition codes. */ 1356 if (p == 4) 1357 { 1358 if (i < 3 || i > 6) 1359 { 1360 name[p + 2] = 0; 1361 as_bad (_("cmpu doesn't support condition code %s"), &name[p]); 1362 } 1363 } 1364 1365 if (!*d30v_str) 1366 { 1367 name[p + 2] = 0; 1368 as_bad (_("unknown condition code: %s"), &name[p]); 1369 } 1370 1371 cmp_hack = i; 1372 name[p] = 0; 1373 } 1374 else 1375 cmp_hack = 0; 1376 1377 /* Need to look for .s or .l. */ 1378 if (name[nlen - 2] == '.') 1379 { 1380 switch (name[nlen - 1]) 1381 { 1382 case 's': 1383 fsize = FORCE_SHORT; 1384 break; 1385 case 'l': 1386 fsize = FORCE_LONG; 1387 break; 1388 } 1389 name[nlen - 2] = 0; 1390 } 1391 1392 /* Find the first opcode with the proper name. */ 1393 opcode->op = (struct d30v_opcode *) hash_find (d30v_hash, name); 1394 if (opcode->op == NULL) 1395 { 1396 as_bad (_("unknown opcode: %s"), name); 1397 return -1; 1398 } 1399 1400 save = input_line_pointer; 1401 input_line_pointer = op_end; 1402 while (!(opcode->form = find_format (opcode->op, myops, fsize, cmp_hack))) 1403 { 1404 opcode->op++; 1405 if (opcode->op->name == NULL || strcmp (opcode->op->name, name)) 1406 { 1407 as_bad (_("operands for opcode `%s' do not match any valid format"), 1408 name); 1409 return -1; 1410 } 1411 } 1412 input_line_pointer = save; 1413 1414 insn = build_insn (opcode, myops); 1415 1416 /* Propagate multiply status. */ 1417 if (insn != -1) 1418 { 1419 if (is_parallel && prev_mul32_p) 1420 cur_mul32_p = 1; 1421 else 1422 { 1423 prev_mul32_p = cur_mul32_p; 1424 cur_mul32_p = (opcode->op->flags_used & FLAG_MUL32) != 0; 1425 } 1426 } 1427 1428 /* Propagate left_kills_right status. */ 1429 if (insn != -1) 1430 { 1431 prev_left_kills_right_p = cur_left_kills_right_p; 1432 1433 if (opcode->op->flags_set & FLAG_LKR) 1434 { 1435 cur_left_kills_right_p = 1; 1436 1437 if (strcmp (opcode->op->name, "mvtsys") == 0) 1438 { 1439 /* Left kills right for only mvtsys only for 1440 PSW/PSWH/PSWL/flags target. */ 1441 if ((myops[0].X_op == O_register) && 1442 ((myops[0].X_add_number == OPERAND_CONTROL) || /* psw */ 1443 (myops[0].X_add_number == OPERAND_CONTROL+MAX_CONTROL_REG+2) || /* pswh */ 1444 (myops[0].X_add_number == OPERAND_CONTROL+MAX_CONTROL_REG+1) || /* pswl */ 1445 (myops[0].X_add_number == OPERAND_FLAG+0) || /* f0 */ 1446 (myops[0].X_add_number == OPERAND_FLAG+1) || /* f1 */ 1447 (myops[0].X_add_number == OPERAND_FLAG+2) || /* f2 */ 1448 (myops[0].X_add_number == OPERAND_FLAG+3) || /* f3 */ 1449 (myops[0].X_add_number == OPERAND_FLAG+4) || /* f4 */ 1450 (myops[0].X_add_number == OPERAND_FLAG+5) || /* f5 */ 1451 (myops[0].X_add_number == OPERAND_FLAG+6) || /* f6 */ 1452 (myops[0].X_add_number == OPERAND_FLAG+7))) /* f7 */ 1453 { 1454 cur_left_kills_right_p = 1; 1455 } 1456 else 1457 { 1458 /* Other mvtsys target registers don't kill right 1459 instruction. */ 1460 cur_left_kills_right_p = 0; 1461 } 1462 } /* mvtsys */ 1463 } 1464 else 1465 cur_left_kills_right_p = 0; 1466 } 1467 1468 return insn; 1469 } 1470 1471 /* Called internally to handle all alignment needs. This takes care 1472 of eliding calls to frag_align if'n the cached current alignment 1473 says we've already got it, as well as taking care of the auto-aligning 1474 labels wrt code. */ 1475 1476 static void 1477 d30v_align (int n, char *pfill, symbolS *label) 1478 { 1479 /* The front end is prone to changing segments out from under us 1480 temporarily when -g is in effect. */ 1481 int switched_seg_p = (d30v_current_align_seg != now_seg); 1482 1483 /* Do not assume that if 'd30v_current_align >= n' and 1484 '! switched_seg_p' that it is safe to avoid performing 1485 this alignment request. The alignment of the current frag 1486 can be changed under our feet, for example by a .ascii 1487 directive in the source code. cf testsuite/gas/d30v/reloc.s */ 1488 d30v_cleanup (FALSE); 1489 1490 if (pfill == NULL) 1491 { 1492 if (n > 2 1493 && (bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE) != 0) 1494 { 1495 static char const nop[4] = { 0x00, 0xf0, 0x00, 0x00 }; 1496 1497 /* First, make sure we're on a four-byte boundary, in case 1498 someone has been putting .byte values the text section. */ 1499 if (d30v_current_align < 2 || switched_seg_p) 1500 frag_align (2, 0, 0); 1501 frag_align_pattern (n, nop, sizeof nop, 0); 1502 } 1503 else 1504 frag_align (n, 0, 0); 1505 } 1506 else 1507 frag_align (n, *pfill, 0); 1508 1509 if (!switched_seg_p) 1510 d30v_current_align = n; 1511 1512 if (label != NULL) 1513 { 1514 symbolS *sym; 1515 int label_seen = FALSE; 1516 struct frag *old_frag; 1517 valueT old_value; 1518 valueT new_value; 1519 1520 gas_assert (S_GET_SEGMENT (label) == now_seg); 1521 1522 old_frag = symbol_get_frag (label); 1523 old_value = S_GET_VALUE (label); 1524 new_value = (valueT) frag_now_fix (); 1525 1526 /* It is possible to have more than one label at a particular 1527 address, especially if debugging is enabled, so we must 1528 take care to adjust all the labels at this address in this 1529 fragment. To save time we search from the end of the symbol 1530 list, backwards, since the symbols we are interested in are 1531 almost certainly the ones that were most recently added. 1532 Also to save time we stop searching once we have seen at least 1533 one matching label, and we encounter a label that is no longer 1534 in the target fragment. Note, this search is guaranteed to 1535 find at least one match when sym == label, so no special case 1536 code is necessary. */ 1537 for (sym = symbol_lastP; sym != NULL; sym = symbol_previous (sym)) 1538 { 1539 if (symbol_get_frag (sym) == old_frag 1540 && S_GET_VALUE (sym) == old_value) 1541 { 1542 label_seen = TRUE; 1543 symbol_set_frag (sym, frag_now); 1544 S_SET_VALUE (sym, new_value); 1545 } 1546 else if (label_seen && symbol_get_frag (sym) != old_frag) 1547 break; 1548 } 1549 } 1550 1551 record_alignment (now_seg, n); 1552 } 1553 1554 /* This is the main entry point for the machine-dependent assembler. 1555 STR points to a machine-dependent instruction. This function is 1556 supposed to emit the frags/bytes it assembles to. For the D30V, it 1557 mostly handles the special VLIW parsing and packing and leaves the 1558 difficult stuff to do_assemble (). */ 1559 1560 static long long prev_insn = -1; 1561 static struct d30v_insn prev_opcode; 1562 static subsegT prev_subseg; 1563 static segT prev_seg = 0; 1564 1565 void 1566 md_assemble (char *str) 1567 { 1568 struct d30v_insn opcode; 1569 long long insn; 1570 /* Execution type; parallel, etc. */ 1571 exec_type_enum extype = EXEC_UNKNOWN; 1572 /* Saved extype. Used for multiline instructions. */ 1573 static exec_type_enum etype = EXEC_UNKNOWN; 1574 char *str2; 1575 1576 if ((prev_insn != -1) && prev_seg 1577 && ((prev_seg != now_seg) || (prev_subseg != now_subseg))) 1578 d30v_cleanup (FALSE); 1579 1580 if (d30v_current_align < 3) 1581 d30v_align (3, NULL, d30v_last_label); 1582 else if (d30v_current_align > 3) 1583 d30v_current_align = 3; 1584 d30v_last_label = NULL; 1585 1586 flag_explicitly_parallel = 0; 1587 flag_xp_state = 0; 1588 if (etype == EXEC_UNKNOWN) 1589 { 1590 /* Look for the special multiple instruction separators. */ 1591 str2 = strstr (str, "||"); 1592 if (str2) 1593 { 1594 extype = EXEC_PARALLEL; 1595 flag_xp_state = 1; 1596 } 1597 else 1598 { 1599 str2 = strstr (str, "->"); 1600 if (str2) 1601 extype = EXEC_SEQ; 1602 else 1603 { 1604 str2 = strstr (str, "<-"); 1605 if (str2) 1606 extype = EXEC_REVSEQ; 1607 } 1608 } 1609 1610 /* STR2 points to the separator, if one. */ 1611 if (str2) 1612 { 1613 *str2 = 0; 1614 1615 /* If two instructions are present and we already have one saved, 1616 then first write it out. */ 1617 d30v_cleanup (FALSE); 1618 1619 /* Assemble first instruction and save it. */ 1620 prev_insn = do_assemble (str, &prev_opcode, 1, 0); 1621 if (prev_insn == -1) 1622 as_bad (_("Cannot assemble instruction")); 1623 if (prev_opcode.form != NULL && prev_opcode.form->form >= LONG) 1624 as_bad (_("First opcode is long. Unable to mix instructions as specified.")); 1625 fixups = fixups->next; 1626 str = str2 + 2; 1627 prev_seg = now_seg; 1628 prev_subseg = now_subseg; 1629 } 1630 } 1631 1632 insn = do_assemble (str, &opcode, 1633 (extype != EXEC_UNKNOWN || etype != EXEC_UNKNOWN), 1634 extype == EXEC_PARALLEL); 1635 if (insn == -1) 1636 { 1637 if (extype != EXEC_UNKNOWN) 1638 etype = extype; 1639 as_bad (_("Cannot assemble instruction")); 1640 return; 1641 } 1642 1643 if (etype != EXEC_UNKNOWN) 1644 { 1645 extype = etype; 1646 etype = EXEC_UNKNOWN; 1647 } 1648 1649 /* Word multiply instructions must not be followed by either a load or a 1650 16-bit multiply instruction in the next cycle. */ 1651 if ( (extype != EXEC_REVSEQ) 1652 && prev_mul32_p 1653 && (opcode.op->flags_used & (FLAG_MEM | FLAG_MUL16))) 1654 { 1655 /* However, load and multiply should able to be combined in a parallel 1656 operation, so check for that first. */ 1657 if (prev_insn != -1 1658 && (opcode.op->flags_used & FLAG_MEM) 1659 && opcode.form->form < LONG 1660 && (extype == EXEC_PARALLEL || (Optimizing && extype == EXEC_UNKNOWN)) 1661 && parallel_ok (&prev_opcode, (long) prev_insn, 1662 &opcode, (long) insn, extype) 1663 && write_2_short (&prev_opcode, (long) prev_insn, 1664 &opcode, (long) insn, extype, fixups) == 0) 1665 { 1666 /* No instructions saved. */ 1667 prev_insn = -1; 1668 return; 1669 } 1670 else 1671 { 1672 /* Can't parallelize, flush previous instruction and emit a 1673 word of NOPS, unless the previous instruction is a NOP, 1674 in which case just flush it, as this will generate a word 1675 of NOPs for us. */ 1676 1677 if (prev_insn != -1 && (strcmp (prev_opcode.op->name, "nop") == 0)) 1678 d30v_cleanup (FALSE); 1679 else 1680 { 1681 char *f; 1682 1683 if (prev_insn != -1) 1684 d30v_cleanup (TRUE); 1685 else 1686 { 1687 f = frag_more (8); 1688 dwarf2_emit_insn (8); 1689 d30v_number_to_chars (f, NOP2, 8); 1690 1691 if (warn_nops == NOP_ALL || warn_nops == NOP_MULTIPLY) 1692 { 1693 if (opcode.op->flags_used & FLAG_MEM) 1694 as_warn (_("word of NOPs added between word multiply and load")); 1695 else 1696 as_warn (_("word of NOPs added between word multiply and 16-bit multiply")); 1697 } 1698 } 1699 } 1700 1701 extype = EXEC_UNKNOWN; 1702 } 1703 } 1704 else if ( (extype == EXEC_REVSEQ) 1705 && cur_mul32_p 1706 && (prev_opcode.op->flags_used & (FLAG_MEM | FLAG_MUL16))) 1707 { 1708 /* Can't parallelize, flush current instruction and add a 1709 sequential NOP. */ 1710 write_1_short (&opcode, (long) insn, fixups->next->next, TRUE); 1711 1712 /* Make the previous instruction the current one. */ 1713 extype = EXEC_UNKNOWN; 1714 insn = prev_insn; 1715 now_seg = prev_seg; 1716 now_subseg = prev_subseg; 1717 prev_insn = -1; 1718 cur_mul32_p = prev_mul32_p; 1719 prev_mul32_p = 0; 1720 memcpy (&opcode, &prev_opcode, sizeof (prev_opcode)); 1721 } 1722 1723 /* If this is a long instruction, write it and any previous short 1724 instruction. */ 1725 if (opcode.form->form >= LONG) 1726 { 1727 if (extype != EXEC_UNKNOWN) 1728 as_bad (_("Instruction uses long version, so it cannot be mixed as specified")); 1729 d30v_cleanup (FALSE); 1730 write_long (&opcode, insn, fixups); 1731 prev_insn = -1; 1732 } 1733 else if ((prev_insn != -1) 1734 && (write_2_short 1735 (&prev_opcode, (long) prev_insn, &opcode, 1736 (long) insn, extype, fixups) == 0)) 1737 { 1738 /* No instructions saved. */ 1739 prev_insn = -1; 1740 } 1741 else 1742 { 1743 if (extype != EXEC_UNKNOWN) 1744 as_bad (_("Unable to mix instructions as specified")); 1745 1746 /* Save off last instruction so it may be packed on next pass. */ 1747 memcpy (&prev_opcode, &opcode, sizeof (prev_opcode)); 1748 prev_insn = insn; 1749 prev_seg = now_seg; 1750 prev_subseg = now_subseg; 1751 fixups = fixups->next; 1752 prev_mul32_p = cur_mul32_p; 1753 } 1754 } 1755 1756 /* If while processing a fixup, a reloc really needs to be created, 1757 then it is done here. */ 1758 1759 arelent * 1760 tc_gen_reloc (asection *seg ATTRIBUTE_UNUSED, fixS *fixp) 1761 { 1762 arelent *reloc; 1763 reloc = xmalloc (sizeof (arelent)); 1764 reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *)); 1765 *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); 1766 reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; 1767 reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type); 1768 if (reloc->howto == NULL) 1769 { 1770 as_bad_where (fixp->fx_file, fixp->fx_line, 1771 _("reloc %d not supported by object file format"), 1772 (int) fixp->fx_r_type); 1773 return NULL; 1774 } 1775 1776 reloc->addend = 0; 1777 return reloc; 1778 } 1779 1780 int 1781 md_estimate_size_before_relax (fragS *fragp ATTRIBUTE_UNUSED, 1782 asection *seg ATTRIBUTE_UNUSED) 1783 { 1784 abort (); 1785 return 0; 1786 } 1787 1788 long 1789 md_pcrel_from_section (fixS *fixp, segT sec) 1790 { 1791 if (fixp->fx_addsy != (symbolS *) NULL 1792 && (!S_IS_DEFINED (fixp->fx_addsy) 1793 || (S_GET_SEGMENT (fixp->fx_addsy) != sec))) 1794 return 0; 1795 return fixp->fx_frag->fr_address + fixp->fx_where; 1796 } 1797 1798 /* Called after the assembler has finished parsing the input file or 1799 after a label is defined. Because the D30V assembler sometimes 1800 saves short instructions to see if it can package them with the 1801 next instruction, there may be a short instruction that still needs 1802 written. */ 1803 1804 int 1805 d30v_cleanup (int use_sequential) 1806 { 1807 segT seg; 1808 subsegT subseg; 1809 1810 if (prev_insn != -1) 1811 { 1812 seg = now_seg; 1813 subseg = now_subseg; 1814 subseg_set (prev_seg, prev_subseg); 1815 write_1_short (&prev_opcode, (long) prev_insn, fixups->next, 1816 use_sequential); 1817 subseg_set (seg, subseg); 1818 prev_insn = -1; 1819 if (use_sequential) 1820 prev_mul32_p = FALSE; 1821 } 1822 1823 return 1; 1824 } 1825 1826 /* This function is called at the start of every line. It checks to 1827 see if the first character is a '.', which indicates the start of a 1828 pseudo-op. If it is, then write out any unwritten instructions. */ 1829 1830 void 1831 d30v_start_line (void) 1832 { 1833 char *c = input_line_pointer; 1834 1835 while (ISSPACE (*c)) 1836 c++; 1837 1838 if (*c == '.') 1839 d30v_cleanup (FALSE); 1840 } 1841 1842 static void 1843 check_size (long value, int bits, char *file, int line) 1844 { 1845 int tmp, max; 1846 1847 if (value < 0) 1848 tmp = ~value; 1849 else 1850 tmp = value; 1851 1852 max = (1 << (bits - 1)) - 1; 1853 1854 if (tmp > max) 1855 as_bad_where (file, line, _("value too large to fit in %d bits"), bits); 1856 } 1857 1858 /* d30v_frob_label() is called when after a label is recognized. */ 1859 1860 void 1861 d30v_frob_label (symbolS *lab) 1862 { 1863 /* Emit any pending instructions. */ 1864 d30v_cleanup (FALSE); 1865 1866 /* Update the label's address with the current output pointer. */ 1867 symbol_set_frag (lab, frag_now); 1868 S_SET_VALUE (lab, (valueT) frag_now_fix ()); 1869 1870 /* Record this label for future adjustment after we find out what 1871 kind of data it references, and the required alignment therewith. */ 1872 d30v_last_label = lab; 1873 1874 dwarf2_emit_label (lab); 1875 } 1876 1877 /* Hook into cons for capturing alignment changes. */ 1878 1879 void 1880 d30v_cons_align (int size) 1881 { 1882 int log_size; 1883 1884 /* Don't specially align anything in debug sections. */ 1885 if ((now_seg->flags & SEC_ALLOC) == 0 1886 || strcmp (now_seg->name, ".eh_frame") == 0) 1887 return; 1888 1889 log_size = 0; 1890 while ((size >>= 1) != 0) 1891 ++log_size; 1892 1893 if (d30v_current_align < log_size) 1894 d30v_align (log_size, (char *) NULL, NULL); 1895 else if (d30v_current_align > log_size) 1896 d30v_current_align = log_size; 1897 d30v_last_label = NULL; 1898 } 1899 1900 void 1901 md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) 1902 { 1903 char *where; 1904 unsigned long insn, insn2; 1905 long value = *valP; 1906 1907 if (fixP->fx_addsy == (symbolS *) NULL) 1908 fixP->fx_done = 1; 1909 1910 /* We don't support subtracting a symbol. */ 1911 if (fixP->fx_subsy != (symbolS *) NULL) 1912 as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex")); 1913 1914 /* Fetch the instruction, insert the fully resolved operand 1915 value, and stuff the instruction back again. */ 1916 where = fixP->fx_frag->fr_literal + fixP->fx_where; 1917 insn = bfd_getb32 ((unsigned char *) where); 1918 1919 switch (fixP->fx_r_type) 1920 { 1921 case BFD_RELOC_8: /* Check for a bad .byte directive. */ 1922 if (fixP->fx_addsy != NULL) 1923 as_bad (_("line %d: unable to place address of symbol '%s' into a byte"), 1924 fixP->fx_line, S_GET_NAME (fixP->fx_addsy)); 1925 else if (((unsigned)value) > 0xff) 1926 as_bad (_("line %d: unable to place value %lx into a byte"), 1927 fixP->fx_line, value); 1928 else 1929 *(unsigned char *) where = value; 1930 break; 1931 1932 case BFD_RELOC_16: /* Check for a bad .short directive. */ 1933 if (fixP->fx_addsy != NULL) 1934 as_bad (_("line %d: unable to place address of symbol '%s' into a short"), 1935 fixP->fx_line, S_GET_NAME (fixP->fx_addsy)); 1936 else if (((unsigned)value) > 0xffff) 1937 as_bad (_("line %d: unable to place value %lx into a short"), 1938 fixP->fx_line, value); 1939 else 1940 bfd_putb16 ((bfd_vma) value, (unsigned char *) where); 1941 break; 1942 1943 case BFD_RELOC_64: /* Check for a bad .quad directive. */ 1944 if (fixP->fx_addsy != NULL) 1945 as_bad (_("line %d: unable to place address of symbol '%s' into a quad"), 1946 fixP->fx_line, S_GET_NAME (fixP->fx_addsy)); 1947 else 1948 { 1949 bfd_putb32 ((bfd_vma) value, (unsigned char *) where); 1950 bfd_putb32 (0, ((unsigned char *) where) + 4); 1951 } 1952 break; 1953 1954 case BFD_RELOC_D30V_6: 1955 check_size (value, 6, fixP->fx_file, fixP->fx_line); 1956 insn |= value & 0x3F; 1957 bfd_putb32 ((bfd_vma) insn, (unsigned char *) where); 1958 break; 1959 1960 case BFD_RELOC_D30V_9_PCREL: 1961 if (fixP->fx_where & 0x7) 1962 { 1963 if (fixP->fx_done) 1964 value += 4; 1965 else 1966 fixP->fx_r_type = BFD_RELOC_D30V_9_PCREL_R; 1967 } 1968 check_size (value, 9, fixP->fx_file, fixP->fx_line); 1969 insn |= ((value >> 3) & 0x3F) << 12; 1970 bfd_putb32 ((bfd_vma) insn, (unsigned char *) where); 1971 break; 1972 1973 case BFD_RELOC_D30V_15: 1974 check_size (value, 15, fixP->fx_file, fixP->fx_line); 1975 insn |= (value >> 3) & 0xFFF; 1976 bfd_putb32 ((bfd_vma) insn, (unsigned char *) where); 1977 break; 1978 1979 case BFD_RELOC_D30V_15_PCREL: 1980 if (fixP->fx_where & 0x7) 1981 { 1982 if (fixP->fx_done) 1983 value += 4; 1984 else 1985 fixP->fx_r_type = BFD_RELOC_D30V_15_PCREL_R; 1986 } 1987 check_size (value, 15, fixP->fx_file, fixP->fx_line); 1988 insn |= (value >> 3) & 0xFFF; 1989 bfd_putb32 ((bfd_vma) insn, (unsigned char *) where); 1990 break; 1991 1992 case BFD_RELOC_D30V_21: 1993 check_size (value, 21, fixP->fx_file, fixP->fx_line); 1994 insn |= (value >> 3) & 0x3FFFF; 1995 bfd_putb32 ((bfd_vma) insn, (unsigned char *) where); 1996 break; 1997 1998 case BFD_RELOC_D30V_21_PCREL: 1999 if (fixP->fx_where & 0x7) 2000 { 2001 if (fixP->fx_done) 2002 value += 4; 2003 else 2004 fixP->fx_r_type = BFD_RELOC_D30V_21_PCREL_R; 2005 } 2006 check_size (value, 21, fixP->fx_file, fixP->fx_line); 2007 insn |= (value >> 3) & 0x3FFFF; 2008 bfd_putb32 ((bfd_vma) insn, (unsigned char *) where); 2009 break; 2010 2011 case BFD_RELOC_D30V_32: 2012 insn2 = bfd_getb32 ((unsigned char *) where + 4); 2013 insn |= (value >> 26) & 0x3F; /* Top 6 bits. */ 2014 insn2 |= ((value & 0x03FC0000) << 2); /* Next 8 bits. */ 2015 insn2 |= value & 0x0003FFFF; /* Bottom 18 bits. */ 2016 bfd_putb32 ((bfd_vma) insn, (unsigned char *) where); 2017 bfd_putb32 ((bfd_vma) insn2, (unsigned char *) where + 4); 2018 break; 2019 2020 case BFD_RELOC_D30V_32_PCREL: 2021 insn2 = bfd_getb32 ((unsigned char *) where + 4); 2022 insn |= (value >> 26) & 0x3F; /* Top 6 bits. */ 2023 insn2 |= ((value & 0x03FC0000) << 2); /* Next 8 bits. */ 2024 insn2 |= value & 0x0003FFFF; /* Bottom 18 bits. */ 2025 bfd_putb32 ((bfd_vma) insn, (unsigned char *) where); 2026 bfd_putb32 ((bfd_vma) insn2, (unsigned char *) where + 4); 2027 break; 2028 2029 case BFD_RELOC_32: 2030 bfd_putb32 ((bfd_vma) value, (unsigned char *) where); 2031 break; 2032 2033 default: 2034 as_bad (_("line %d: unknown relocation type: 0x%x"), 2035 fixP->fx_line, fixP->fx_r_type); 2036 } 2037 } 2038 2039 /* Handle the .align pseudo-op. This aligns to a power of two. We 2040 hook here to latch the current alignment. */ 2041 2042 static void 2043 s_d30v_align (int ignore ATTRIBUTE_UNUSED) 2044 { 2045 int align; 2046 char fill, *pfill = NULL; 2047 long max_alignment = 15; 2048 2049 align = get_absolute_expression (); 2050 if (align > max_alignment) 2051 { 2052 align = max_alignment; 2053 as_warn (_("Alignment too large: %d assumed"), align); 2054 } 2055 else if (align < 0) 2056 { 2057 as_warn (_("Alignment negative: 0 assumed")); 2058 align = 0; 2059 } 2060 2061 if (*input_line_pointer == ',') 2062 { 2063 input_line_pointer++; 2064 fill = get_absolute_expression (); 2065 pfill = &fill; 2066 } 2067 2068 d30v_last_label = NULL; 2069 d30v_align (align, pfill, NULL); 2070 2071 demand_empty_rest_of_line (); 2072 } 2073 2074 /* Handle the .text pseudo-op. This is like the usual one, but it 2075 clears the saved last label and resets known alignment. */ 2076 2077 static void 2078 s_d30v_text (int i) 2079 2080 { 2081 s_text (i); 2082 d30v_last_label = NULL; 2083 d30v_current_align = 0; 2084 d30v_current_align_seg = now_seg; 2085 } 2086 2087 /* Handle the .data pseudo-op. This is like the usual one, but it 2088 clears the saved last label and resets known alignment. */ 2089 2090 static void 2091 s_d30v_data (int i) 2092 { 2093 s_data (i); 2094 d30v_last_label = NULL; 2095 d30v_current_align = 0; 2096 d30v_current_align_seg = now_seg; 2097 } 2098 2099 /* Handle the .section pseudo-op. This is like the usual one, but it 2100 clears the saved last label and resets known alignment. */ 2101 2102 static void 2103 s_d30v_section (int ignore) 2104 { 2105 obj_elf_section (ignore); 2106 d30v_last_label = NULL; 2107 d30v_current_align = 0; 2108 d30v_current_align_seg = now_seg; 2109 } 2110 2111 /* The target specific pseudo-ops which we support. */ 2112 const pseudo_typeS md_pseudo_table[] = 2113 { 2114 { "word", cons, 4 }, 2115 { "hword", cons, 2 }, 2116 { "align", s_d30v_align, 0 }, 2117 { "text", s_d30v_text, 0 }, 2118 { "data", s_d30v_data, 0 }, 2119 { "section", s_d30v_section, 0 }, 2120 { "section.s", s_d30v_section, 0 }, 2121 { "sect", s_d30v_section, 0 }, 2122 { "sect.s", s_d30v_section, 0 }, 2123 { NULL, NULL, 0 } 2124 }; 2125
