srcdest.c revision 1.3
1 /* srcdest.c --- decoding M32C addressing modes. 2 3 Copyright (C) 2005-2015 Free Software Foundation, Inc. 4 Contributed by Red Hat, Inc. 5 6 This file is part of the GNU simulators. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 22 #include <stdio.h> 23 #include <stdlib.h> 24 25 #include "cpu.h" 26 #include "mem.h" 27 28 static int src_indirect = 0; 29 static int dest_indirect = 0; 30 static int src_addend = 0; 31 static int dest_addend = 0; 32 33 static int 34 disp8 () 35 { 36 int rv; 37 int tsave = trace; 38 39 if (trace == 1) 40 trace = 0; 41 rv = mem_get_qi (get_reg (pc)); 42 regs.r_pc++; 43 trace = tsave; 44 return rv; 45 } 46 47 static int 48 disp16 () 49 { 50 int rv; 51 int tsave = trace; 52 53 if (trace == 1) 54 trace = 0; 55 rv = mem_get_hi (get_reg (pc)); 56 regs.r_pc += 2; 57 trace = tsave; 58 return rv; 59 } 60 61 static int 62 disp24 () 63 { 64 int rv; 65 int tsave = trace; 66 67 if (trace == 1) 68 trace = 0; 69 rv = mem_get_psi (get_reg (pc)); 70 regs.r_pc += 3; 71 trace = tsave; 72 return rv; 73 } 74 75 static int 76 disp20 () 77 { 78 return disp24 () & 0x000fffff; 79 } 80 81 const char * 82 bits (int v, int b) 83 { 84 static char buf[17]; 85 char *bp = buf + 16; 86 *bp = 0; 87 while (b) 88 { 89 *--bp = (v & 1) ? '1' : '0'; 90 v >>= 1; 91 b--; 92 } 93 return bp; 94 } 95 96 static const char *the_bits = 0; 97 98 void 99 decode_indirect (int si, int di) 100 { 101 src_indirect = si; 102 dest_indirect = di; 103 if (trace && (si || di)) 104 printf ("indirect: s:%d d:%d\n", si, di); 105 } 106 107 void 108 decode_index (int sa, int da) 109 { 110 src_addend = sa; 111 dest_addend = da; 112 if (trace && (sa || da)) 113 printf ("index: s:%d d:%d\n", sa, da); 114 } 115 116 srcdest 117 decode_srcdest4 (int destcode, int bw) 118 { 119 srcdest sd; 120 sd.bytes = bw ? 2 : 1; 121 sd.mem = (destcode >= 6) ? 1 : 0; 122 static const char *dc_wnames[16] = { "r0", "r1", "r2", "r3", 123 "a0", "a1", "[a0]", "[a1]", 124 "disp8[a0]", "disp8[a1]", "disp8[sb]", "disp8[fb]", 125 "disp16[a0]", "disp16[a1]", "disp16[sb]", "disp16" 126 }; 127 static const char *dc_bnames[4] = { "r0l", "r0h", "r1l", "r1h" };; 128 129 if (trace) 130 { 131 const char *n = dc_wnames[destcode]; 132 if (bw == 0 && destcode <= 3) 133 n = dc_bnames[destcode]; 134 if (!the_bits) 135 the_bits = bits (destcode, 4); 136 printf ("decode: %s (%d) : %s\n", the_bits, destcode, n); 137 the_bits = 0; 138 } 139 140 switch (destcode) 141 { 142 case 0x0: 143 sd.u.reg = bw ? r0 : r0l; 144 break; 145 case 0x1: 146 sd.u.reg = bw ? r1 : r0h; 147 break; 148 case 0x2: 149 sd.u.reg = bw ? r2 : r1l; 150 break; 151 case 0x3: 152 sd.u.reg = bw ? r3 : r1h; 153 break; 154 case 0x4: 155 sd.u.reg = a0; 156 break; 157 case 0x5: 158 sd.u.reg = a1; 159 break; 160 case 0x6: 161 sd.u.addr = get_reg (a0); 162 break; 163 case 0x7: 164 sd.u.addr = get_reg (a1); 165 break; 166 case 0x8: 167 sd.u.addr = get_reg (a0) + disp8 (); 168 break; 169 case 0x9: 170 sd.u.addr = get_reg (a1) + disp8 (); 171 break; 172 case 0xa: 173 sd.u.addr = get_reg (sb) + disp8 (); 174 break; 175 case 0xb: 176 sd.u.addr = get_reg (fb) + sign_ext (disp8 (), 8); 177 break; 178 case 0xc: 179 sd.u.addr = get_reg (a0) + disp16 (); 180 break; 181 case 0xd: 182 sd.u.addr = get_reg (a1) + disp16 (); 183 break; 184 case 0xe: 185 sd.u.addr = get_reg (sb) + disp16 (); 186 break; 187 case 0xf: 188 sd.u.addr = disp16 (); 189 break; 190 default: 191 abort (); 192 } 193 if (sd.mem) 194 sd.u.addr &= addr_mask; 195 return sd; 196 } 197 198 srcdest 199 decode_jumpdest (int destcode, int w) 200 { 201 srcdest sd; 202 sd.bytes = w ? 2 : 3; 203 sd.mem = (destcode >= 6) ? 1 : 0; 204 static const char *dc_wnames[16] = { "r0", "r1", "r2", "r3", 205 "a0", "a1", "[a0]", "[a1]", 206 "disp8[a0]", "disp8[a1]", "disp8[sb]", "disp8[fb]", 207 "disp20[a0]", "disp20[a1]", "disp16[sb]", "abs16" 208 }; 209 static const char *dc_anames[4] = { "r0l", "r0h", "r1l", "r1h" }; 210 211 if (trace) 212 { 213 const char *n = dc_wnames[destcode]; 214 if (w == 0 && destcode <= 3) 215 n = dc_anames[destcode]; 216 if (!the_bits) 217 the_bits = bits (destcode, 4); 218 printf ("decode: %s : %s\n", the_bits, n); 219 the_bits = 0; 220 } 221 222 switch (destcode) 223 { 224 case 0x0: 225 sd.u.reg = w ? r0 : r2r0; 226 break; 227 case 0x1: 228 sd.u.reg = w ? r1 : r2r0; 229 break; 230 case 0x2: 231 sd.u.reg = w ? r2 : r3r1; 232 break; 233 case 0x3: 234 sd.u.reg = w ? r3 : r3r1; 235 break; 236 case 0x4: 237 sd.u.reg = w ? a0 : a1a0; 238 break; 239 case 0x5: 240 sd.u.reg = w ? a1 : a1a0; 241 break; 242 case 0x6: 243 sd.u.addr = get_reg (a0); 244 break; 245 case 0x7: 246 sd.u.addr = get_reg (a1); 247 break; 248 case 0x8: 249 sd.u.addr = get_reg (a0) + disp8 (); 250 break; 251 case 0x9: 252 sd.u.addr = get_reg (a1) + disp8 (); 253 break; 254 case 0xa: 255 sd.u.addr = get_reg (sb) + disp8 (); 256 break; 257 case 0xb: 258 sd.u.addr = get_reg (fb) + sign_ext (disp8 (), 8); 259 break; 260 case 0xc: 261 sd.u.addr = get_reg (a0) + disp20 (); 262 break; 263 case 0xd: 264 sd.u.addr = get_reg (a1) + disp20 (); 265 break; 266 case 0xe: 267 sd.u.addr = get_reg (sb) + disp16 (); 268 break; 269 case 0xf: 270 sd.u.addr = disp16 (); 271 break; 272 default: 273 abort (); 274 } 275 if (sd.mem) 276 sd.u.addr &= addr_mask; 277 return sd; 278 } 279 280 srcdest 281 decode_dest3 (int destcode, int bw) 282 { 283 static char map[8] = { -1, -1, -1, 1, 0, 10, 11, 15 }; 284 285 the_bits = bits (destcode, 3); 286 return decode_srcdest4 (map[destcode], bw); 287 } 288 289 srcdest 290 decode_src2 (int srccode, int bw, int d) 291 { 292 static char map[4] = { 0, 10, 11, 15 }; 293 294 the_bits = bits (srccode, 2); 295 return decode_srcdest4 (srccode ? map[srccode] : 1 - d, bw); 296 } 297 298 static struct 299 { 300 reg_id b_regno; 301 reg_id w_regno; 302 int is_memory; 303 int disp_bytes; 304 char *name; 305 } modes23[] = 306 { 307 { 308 a0, a0, 1, 0, "[A0]"}, /* 0 0 0 0 0 */ 309 { 310 a1, a1, 1, 0, "[A1]"}, /* 0 0 0 0 1 */ 311 { 312 a0, a0, 0, 0, "A0"}, /* 0 0 0 1 0 */ 313 { 314 a1, a1, 0, 0, "A1"}, /* 0 0 0 1 1 */ 315 { 316 a0, a0, 1, 1, "dsp:8[A0]"}, /* 0 0 1 0 0 */ 317 { 318 a1, a1, 1, 1, "dsp:8[A1]"}, /* 0 0 1 0 1 */ 319 { 320 sb, sb, 1, 1, "dsp:8[SB]"}, /* 0 0 1 1 0 */ 321 { 322 fb, fb, 1, -1, "dsp:8[FB]"}, /* 0 0 1 1 1 */ 323 { 324 a0, a0, 1, 2, "dsp:16[A0]"}, /* 0 1 0 0 0 */ 325 { 326 a1, a1, 1, 2, "dsp:16[A1]"}, /* 0 1 0 0 1 */ 327 { 328 sb, sb, 1, 2, "dsp:16[SB]"}, /* 0 1 0 1 0 */ 329 { 330 fb, fb, 1, -2, "dsp:16[FB]"}, /* 0 1 0 1 1 */ 331 { 332 a0, a0, 1, 3, "dsp:24[A0]"}, /* 0 1 1 0 0 */ 333 { 334 a1, a1, 1, 3, "dsp:24[A1]"}, /* 0 1 1 0 1 */ 335 { 336 mem, mem, 1, 3, "abs24"}, /* 0 1 1 1 0 */ 337 { 338 mem, mem, 1, 2, "abs16"}, /* 0 1 1 1 1 */ 339 { 340 r0h, r2, 0, 0, "R0H/R2"}, /* 1 0 0 0 0 */ 341 { 342 r1h, r3, 0, 0, "R1H/R3"}, /* 1 0 0 0 1 */ 343 { 344 r0l, r0, 0, 0, "R0L/R0"}, /* 1 0 0 1 0 */ 345 { 346 r1l, r1, 0, 0, "R1L/R1"}, /* 1 0 0 1 1 */ 347 }; 348 349 static srcdest 350 decode_sd23 (int bbb, int bb, int bytes, int ind, int add) 351 { 352 srcdest sd; 353 int code = (bbb << 2) | bb; 354 355 if (code >= sizeof (modes23) / sizeof (modes23[0])) 356 abort (); 357 358 if (trace) 359 { 360 char *b1 = ""; 361 char *b2 = ""; 362 char ad[30]; 363 if (ind) 364 { 365 b1 = "["; 366 b2 = "]"; 367 } 368 if (add) 369 sprintf (ad, "%+d", add); 370 else 371 ad[0] = 0; 372 if (!the_bits) 373 the_bits = bits (code, 4); 374 printf ("decode: %s (%d) : %s%s%s%s\n", the_bits, code, b1, 375 modes23[code].name, ad, b2); 376 the_bits = 0; 377 } 378 379 sd.bytes = bytes; 380 sd.mem = modes23[code].is_memory; 381 if (sd.mem) 382 { 383 if (modes23[code].w_regno == mem) 384 sd.u.addr = 0; 385 else 386 sd.u.addr = get_reg (modes23[code].w_regno); 387 switch (modes23[code].disp_bytes) 388 { 389 case 1: 390 sd.u.addr += disp8 (); 391 break; 392 case 2: 393 sd.u.addr += disp16 (); 394 break; 395 case -1: 396 sd.u.addr += sign_ext (disp8 (), 8); 397 break; 398 case -2: 399 sd.u.addr += sign_ext (disp16 (), 16); 400 break; 401 case 3: 402 sd.u.addr += disp24 (); 403 break; 404 default: 405 break; 406 } 407 if (add) 408 sd.u.addr += add; 409 if (ind) 410 sd.u.addr = mem_get_si (sd.u.addr & membus_mask); 411 sd.u.addr &= membus_mask; 412 } 413 else 414 { 415 sd.u.reg = (bytes > 1) ? modes23[code].w_regno : modes23[code].b_regno; 416 if (bytes == 3 || bytes == 4) 417 { 418 switch (sd.u.reg) 419 { 420 case r0: 421 sd.u.reg = r2r0; 422 break; 423 case r1: 424 sd.u.reg = r3r1; 425 break; 426 case r2: 427 abort (); 428 case r3: 429 abort (); 430 default:; 431 } 432 } 433 434 } 435 return sd; 436 } 437 438 srcdest 439 decode_dest23 (int ddd, int dd, int bytes) 440 { 441 return decode_sd23 (ddd, dd, bytes, dest_indirect, dest_addend); 442 } 443 444 srcdest 445 decode_src23 (int sss, int ss, int bytes) 446 { 447 return decode_sd23 (sss, ss, bytes, src_indirect, src_addend); 448 } 449 450 srcdest 451 decode_dest2 (int dd, int bytes) 452 { 453 /* r0l/r0, abs16, dsp:8[SB], dsp:8[FB] */ 454 static char map[4] = { 0x12, 0x0f, 0x06, 0x07 }; 455 456 the_bits = bits (dd, 2); 457 return decode_sd23 (map[dd] >> 2, map[dd] & 3, bytes, dest_indirect, 458 dest_addend); 459 } 460 461 srcdest 462 decode_src3 (int sss, int bytes) 463 { 464 /* r0, r1, a0, a1, r2, r3, N/A, N/A */ 465 static char map[8] = { 0x12, 0x13, 0x02, 0x03, 0x10, 0x11, 0, 0 }; 466 467 the_bits = bits (sss, 3); 468 return decode_sd23 (map[sss] >> 2, map[sss] & 3, bytes, src_indirect, 469 src_addend); 470 } 471 472 srcdest 473 decode_dest1 (int destcode, int bw) 474 { 475 the_bits = bits (destcode, 1); 476 return decode_srcdest4 (destcode, bw); 477 } 478 479 srcdest 480 decode_cr (int crcode) 481 { 482 static int regcode[] = { 0, intbl, intbh, flags, isp, sp, sb, fb }; 483 srcdest sd; 484 sd.mem = 0; 485 sd.bytes = 2; 486 sd.u.reg = regcode[crcode & 7]; 487 return sd; 488 } 489 490 srcdest 491 decode_cr_b (int crcode, int bank) 492 { 493 /* FIXME: intbl, intbh, isp */ 494 static int regcode[3][8] = { 495 {0, 0, flags, 0, 0, 0, 0, 0}, 496 {intb, sp, sb, fb, 0, 0, 0, isp}, 497 {0, 0, 0, 0, 0, 0, 0, 0} 498 }; 499 srcdest sd; 500 sd.mem = 0; 501 sd.bytes = bank ? 3 : 2; 502 sd.u.reg = regcode[bank][crcode & 7]; 503 return sd; 504 } 505 506 srcdest 507 widen_sd (srcdest sd) 508 { 509 sd.bytes *= 2; 510 if (!sd.mem) 511 switch (sd.u.reg) 512 { 513 case r0l: 514 sd.u.reg = r0; 515 break; 516 case r0: 517 sd.u.reg = r2r0; 518 break; 519 case r1l: 520 sd.u.reg = r1; 521 break; 522 case r1: 523 sd.u.reg = r3r1; 524 break; 525 case a0: 526 if (A16) 527 sd.u.reg = a1a0; 528 break; 529 default: 530 break; 531 } 532 return sd; 533 } 534 535 srcdest 536 reg_sd (reg_id reg) 537 { 538 srcdest rv; 539 rv.bytes = reg_bytes[reg]; 540 rv.mem = 0; 541 rv.u.reg = reg; 542 return rv; 543 } 544 545 int 546 get_src (srcdest sd) 547 { 548 int v; 549 if (sd.mem) 550 { 551 switch (sd.bytes) 552 { 553 case 1: 554 v = mem_get_qi (sd.u.addr); 555 break; 556 case 2: 557 v = mem_get_hi (sd.u.addr); 558 break; 559 case 3: 560 v = mem_get_psi (sd.u.addr); 561 break; 562 case 4: 563 v = mem_get_si (sd.u.addr); 564 break; 565 default: 566 abort (); 567 } 568 } 569 else 570 { 571 v = get_reg (sd.u.reg); 572 switch (sd.bytes) 573 { 574 case 1: 575 v &= 0xff; 576 break; 577 case 2: 578 v &= 0xffff; 579 break; 580 case 3: 581 v &= 0xffffff; 582 break; 583 } 584 } 585 return v; 586 } 587 588 void 589 put_dest (srcdest sd, int v) 590 { 591 if (sd.mem) 592 { 593 switch (sd.bytes) 594 { 595 case 1: 596 mem_put_qi (sd.u.addr, v); 597 break; 598 case 2: 599 mem_put_hi (sd.u.addr, v); 600 break; 601 case 3: 602 mem_put_psi (sd.u.addr, v); 603 break; 604 case 4: 605 mem_put_si (sd.u.addr, v); 606 break; 607 } 608 } 609 else 610 { 611 switch (sd.bytes) 612 { 613 case 1: 614 v &= 0xff; 615 break; 616 case 2: 617 v &= 0xffff; 618 break; 619 case 3: 620 v &= 0xffffff; 621 break; 622 } 623 put_reg (sd.u.reg, v); 624 } 625 } 626 627 srcdest 628 decode_bit (int destcode) 629 { 630 srcdest sd; 631 int addr = 0; 632 static const char *dc_names[] = { "r0", "r1", "r2", "r3", 633 "a0", "a1", "[a0]", "[a1]", 634 "disp8[a0]", "disp8[a1]", "disp8[sb]", "disp8[fb]", 635 "disp16[a0]", "disp16[a1]", "disp16[sb]", "abs16" 636 }; 637 638 if (trace) 639 { 640 const char *the_bits = bits (destcode, 4); 641 printf ("decode: %s : %s\n", the_bits, dc_names[destcode]); 642 } 643 644 switch (destcode) 645 { 646 case 0: 647 sd.u.reg = r0; 648 break; 649 case 1: 650 sd.u.reg = r1; 651 break; 652 case 2: 653 sd.u.reg = r2; 654 break; 655 case 3: 656 sd.u.reg = r3; 657 break; 658 case 4: 659 sd.u.reg = a0; 660 break; 661 case 5: 662 sd.u.reg = a1; 663 break; 664 case 6: 665 addr = get_reg (a0); 666 break; 667 case 7: 668 addr = get_reg (a1); 669 break; 670 case 8: 671 addr = get_reg (a0) + disp8 (); 672 break; 673 case 9: 674 addr = get_reg (a1) + disp8 (); 675 break; 676 case 10: 677 addr = get_reg (sb) * 8 + disp8 (); 678 break; 679 case 11: 680 addr = get_reg (fb) * 8 + sign_ext (disp8 (), 8); 681 break; 682 case 12: 683 addr = get_reg (a0) + disp16 (); 684 break; 685 case 13: 686 addr = get_reg (a1) + disp16 (); 687 break; 688 case 14: 689 addr = get_reg (sb) + disp16 (); 690 break; 691 case 15: 692 addr = disp16 (); 693 break; 694 } 695 696 if (destcode < 6) 697 { 698 int d = disp8 (); 699 sd.mem = 0; 700 sd.mask = 1 << (d & 0x0f); 701 } 702 else 703 { 704 addr &= addr_mask; 705 sd.mem = 1; 706 sd.mask = 1 << (addr & 7); 707 sd.u.addr = addr >> 3; 708 } 709 return sd; 710 } 711 712 srcdest 713 decode_bit11 (int op0) 714 { 715 srcdest sd; 716 sd.mask = 1 << (op0 & 7); 717 sd.mem = 1; 718 sd.u.addr = get_reg (sb) + disp8 (); 719 return sd; 720 } 721 722 int 723 get_bit (srcdest sd) 724 { 725 int b; 726 if (sd.mem) 727 b = mem_get_qi (sd.u.addr) & sd.mask; 728 else 729 b = get_reg (sd.u.reg) & sd.mask; 730 return b ? 1 : 0; 731 } 732 733 void 734 put_bit (srcdest sd, int val) 735 { 736 int b; 737 if (sd.mem) 738 b = mem_get_qi (sd.u.addr); 739 else 740 b = get_reg (sd.u.reg); 741 if (val) 742 b |= sd.mask; 743 else 744 b &= ~sd.mask; 745 if (sd.mem) 746 mem_put_qi (sd.u.addr, b); 747 else 748 put_reg (sd.u.reg, b); 749 } 750 751 int 752 get_bit2 (srcdest sd, int bit) 753 { 754 int b; 755 if (sd.mem) 756 b = mem_get_qi (sd.u.addr + (bit >> 3)) & (1 << (bit & 7)); 757 else 758 b = get_reg (sd.u.reg) & (1 << bit); 759 return b ? 1 : 0; 760 } 761 762 void 763 put_bit2 (srcdest sd, int bit, int val) 764 { 765 int b; 766 if (sd.mem) 767 b = mem_get_qi (sd.u.addr + (bit >> 3)); 768 else 769 b = get_reg (sd.u.reg); 770 if (val) 771 b |= (1 << (bit & 7)); 772 else 773 b &= ~(1 << (bit & 7)); 774 if (sd.mem) 775 mem_put_qi (sd.u.addr + (bit >> 3), b); 776 else 777 put_reg (sd.u.reg, b); 778 } 779
Indexes created Mon May 04 00:23:20 UTC 2026