1 /* Altera Nios II disassemble routines 2 Copyright (C) 2012-2016 Free Software Foundation, Inc. 3 Contributed by Nigel Gray (ngray (at) altera.com). 4 Contributed by Mentor Graphics, Inc. 5 6 This file is part of the GNU opcodes library. 7 8 This library 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, or (at your option) 11 any later version. 12 13 It is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 16 License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this file; see the file COPYING. If not, write to the 20 Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 #include "sysdep.h" 24 #include "dis-asm.h" 25 #include "opcode/nios2.h" 26 #include "libiberty.h" 27 #include <string.h> 28 #include <assert.h> 29 30 /* No symbol table is available when this code runs out in an embedded 31 system as when it is used for disassembler support in a monitor. */ 32 #if !defined(EMBEDDED_ENV) 33 #define SYMTAB_AVAILABLE 1 34 #include "elf-bfd.h" 35 #include "elf/nios2.h" 36 #endif 37 38 /* Default length of Nios II instruction in bytes. */ 39 #define INSNLEN 4 40 41 /* Data structures used by the opcode hash table. */ 42 typedef struct _nios2_opcode_hash 43 { 44 const struct nios2_opcode *opcode; 45 struct _nios2_opcode_hash *next; 46 } nios2_opcode_hash; 47 48 /* Hash table size. */ 49 #define OPCODE_HASH_SIZE (IW_R1_OP_UNSHIFTED_MASK + 1) 50 51 /* Extract the opcode from an instruction word. */ 52 static unsigned int 53 nios2_r1_extract_opcode (unsigned int x) 54 { 55 return GET_IW_R1_OP (x); 56 } 57 58 static unsigned int 59 nios2_r2_extract_opcode (unsigned int x) 60 { 61 return GET_IW_R2_OP (x); 62 } 63 64 /* We maintain separate hash tables for R1 and R2 opcodes, and pseudo-ops 65 are stored in a different table than regular instructions. */ 66 67 typedef struct _nios2_disassembler_state 68 { 69 const struct nios2_opcode *opcodes; 70 const int *num_opcodes; 71 unsigned int (*extract_opcode) (unsigned int); 72 nios2_opcode_hash *hash[OPCODE_HASH_SIZE]; 73 nios2_opcode_hash *ps_hash[OPCODE_HASH_SIZE]; 74 const struct nios2_opcode *nop; 75 bfd_boolean init; 76 } nios2_disassembler_state; 77 78 static nios2_disassembler_state 79 nios2_r1_disassembler_state = { 80 nios2_r1_opcodes, 81 &nios2_num_r1_opcodes, 82 nios2_r1_extract_opcode, 83 {}, 84 {}, 85 NULL, 86 0 87 }; 88 89 static nios2_disassembler_state 90 nios2_r2_disassembler_state = { 91 nios2_r2_opcodes, 92 &nios2_num_r2_opcodes, 93 nios2_r2_extract_opcode, 94 {}, 95 {}, 96 NULL, 97 0 98 }; 99 100 /* Function to initialize the opcode hash table. */ 101 static void 102 nios2_init_opcode_hash (nios2_disassembler_state *state) 103 { 104 unsigned int i; 105 register const struct nios2_opcode *op; 106 107 for (i = 0; i < OPCODE_HASH_SIZE; i++) 108 for (op = state->opcodes; op < &state->opcodes[*(state->num_opcodes)]; op++) 109 { 110 nios2_opcode_hash *new_hash; 111 nios2_opcode_hash **bucket = NULL; 112 113 if ((op->pinfo & NIOS2_INSN_MACRO) == NIOS2_INSN_MACRO) 114 { 115 if (i == state->extract_opcode (op->match) 116 && (op->pinfo & (NIOS2_INSN_MACRO_MOV | NIOS2_INSN_MACRO_MOVI) 117 & 0x7fffffff)) 118 { 119 bucket = &(state->ps_hash[i]); 120 if (strcmp (op->name, "nop") == 0) 121 state->nop = op; 122 } 123 } 124 else if (i == state->extract_opcode (op->match)) 125 bucket = &(state->hash[i]); 126 127 if (bucket) 128 { 129 new_hash = 130 (nios2_opcode_hash *) malloc (sizeof (nios2_opcode_hash)); 131 if (new_hash == NULL) 132 { 133 fprintf (stderr, 134 "error allocating memory...broken disassembler\n"); 135 abort (); 136 } 137 new_hash->opcode = op; 138 new_hash->next = NULL; 139 while (*bucket) 140 bucket = &((*bucket)->next); 141 *bucket = new_hash; 142 } 143 } 144 state->init = 1; 145 146 #ifdef DEBUG_HASHTABLE 147 for (i = 0; i < OPCODE_HASH_SIZE; ++i) 148 { 149 nios2_opcode_hash *tmp_hash = state->hash[i]; 150 printf ("index: 0x%02X ops: ", i); 151 while (tmp_hash != NULL) 152 { 153 printf ("%s ", tmp_hash->opcode->name); 154 tmp_hash = tmp_hash->next; 155 } 156 printf ("\n"); 157 } 158 159 for (i = 0; i < OPCODE_HASH_SIZE; ++i) 160 { 161 nios2_opcode_hash *tmp_hash = state->ps_hash[i]; 162 printf ("index: 0x%02X ops: ", i); 163 while (tmp_hash != NULL) 164 { 165 printf ("%s ", tmp_hash->opcode->name); 166 tmp_hash = tmp_hash->next; 167 } 168 printf ("\n"); 169 } 170 #endif /* DEBUG_HASHTABLE */ 171 } 172 173 /* Return a pointer to an nios2_opcode struct for a given instruction 174 word OPCODE for bfd machine MACH, or NULL if there is an error. */ 175 const struct nios2_opcode * 176 nios2_find_opcode_hash (unsigned long opcode, unsigned long mach) 177 { 178 nios2_opcode_hash *entry; 179 nios2_disassembler_state *state; 180 181 /* Select the right instruction set, hash tables, and opcode accessor 182 for the mach variant. */ 183 if (mach == bfd_mach_nios2r2) 184 state = &nios2_r2_disassembler_state; 185 else 186 state = &nios2_r1_disassembler_state; 187 188 /* Build a hash table to shorten the search time. */ 189 if (!state->init) 190 nios2_init_opcode_hash (state); 191 192 /* Check for NOP first. Both NOP and MOV are macros that expand into 193 an ADD instruction, and we always want to give priority to NOP. */ 194 if (state->nop->match == (opcode & state->nop->mask)) 195 return state->nop; 196 197 /* First look in the pseudo-op hashtable. */ 198 for (entry = state->ps_hash[state->extract_opcode (opcode)]; 199 entry; entry = entry->next) 200 if (entry->opcode->match == (opcode & entry->opcode->mask)) 201 return entry->opcode; 202 203 /* Otherwise look in the main hashtable. */ 204 for (entry = state->hash[state->extract_opcode (opcode)]; 205 entry; entry = entry->next) 206 if (entry->opcode->match == (opcode & entry->opcode->mask)) 207 return entry->opcode; 208 209 return NULL; 210 } 211 212 /* There are 32 regular registers, 32 coprocessor registers, 213 and 32 control registers. */ 214 #define NUMREGNAMES 32 215 216 /* Return a pointer to the base of the coprocessor register name array. */ 217 static struct nios2_reg * 218 nios2_coprocessor_regs (void) 219 { 220 static struct nios2_reg *cached = NULL; 221 222 if (!cached) 223 { 224 int i; 225 for (i = NUMREGNAMES; i < nios2_num_regs; i++) 226 if (!strcmp (nios2_regs[i].name, "c0")) 227 { 228 cached = nios2_regs + i; 229 break; 230 } 231 assert (cached); 232 } 233 return cached; 234 } 235 236 /* Return a pointer to the base of the control register name array. */ 237 static struct nios2_reg * 238 nios2_control_regs (void) 239 { 240 static struct nios2_reg *cached = NULL; 241 242 if (!cached) 243 { 244 int i; 245 for (i = NUMREGNAMES; i < nios2_num_regs; i++) 246 if (!strcmp (nios2_regs[i].name, "status")) 247 { 248 cached = nios2_regs + i; 249 break; 250 } 251 assert (cached); 252 } 253 return cached; 254 } 255 256 /* Helper routine to report internal errors. */ 257 static void 258 bad_opcode (const struct nios2_opcode *op) 259 { 260 fprintf (stderr, "Internal error: broken opcode descriptor for `%s %s'\n", 261 op->name, op->args); 262 abort (); 263 } 264 265 /* The function nios2_print_insn_arg uses the character pointed 266 to by ARGPTR to determine how it print the next token or separator 267 character in the arguments to an instruction. */ 268 static int 269 nios2_print_insn_arg (const char *argptr, 270 unsigned long opcode, bfd_vma address, 271 disassemble_info *info, 272 const struct nios2_opcode *op) 273 { 274 unsigned long i = 0; 275 struct nios2_reg *reg_base; 276 277 switch (*argptr) 278 { 279 case ',': 280 case '(': 281 case ')': 282 (*info->fprintf_func) (info->stream, "%c", *argptr); 283 break; 284 285 case 'c': 286 /* Control register index. */ 287 switch (op->format) 288 { 289 case iw_r_type: 290 i = GET_IW_R_IMM5 (opcode); 291 break; 292 case iw_F3X6L5_type: 293 i = GET_IW_F3X6L5_IMM5 (opcode); 294 break; 295 default: 296 bad_opcode (op); 297 } 298 reg_base = nios2_control_regs (); 299 (*info->fprintf_func) (info->stream, "%s", reg_base[i].name); 300 break; 301 302 case 'd': 303 reg_base = nios2_regs; 304 switch (op->format) 305 { 306 case iw_r_type: 307 i = GET_IW_R_C (opcode); 308 break; 309 case iw_custom_type: 310 i = GET_IW_CUSTOM_C (opcode); 311 if (GET_IW_CUSTOM_READC (opcode) == 0) 312 reg_base = nios2_coprocessor_regs (); 313 break; 314 case iw_F3X6L5_type: 315 case iw_F3X6_type: 316 i = GET_IW_F3X6L5_C (opcode); 317 break; 318 case iw_F3X8_type: 319 i = GET_IW_F3X8_C (opcode); 320 if (GET_IW_F3X8_READC (opcode) == 0) 321 reg_base = nios2_coprocessor_regs (); 322 break; 323 case iw_F2_type: 324 i = GET_IW_F2_B (opcode); 325 break; 326 default: 327 bad_opcode (op); 328 } 329 if (i < NUMREGNAMES) 330 (*info->fprintf_func) (info->stream, "%s", reg_base[i].name); 331 else 332 (*info->fprintf_func) (info->stream, "unknown"); 333 break; 334 335 case 's': 336 reg_base = nios2_regs; 337 switch (op->format) 338 { 339 case iw_r_type: 340 i = GET_IW_R_A (opcode); 341 break; 342 case iw_i_type: 343 i = GET_IW_I_A (opcode); 344 break; 345 case iw_custom_type: 346 i = GET_IW_CUSTOM_A (opcode); 347 if (GET_IW_CUSTOM_READA (opcode) == 0) 348 reg_base = nios2_coprocessor_regs (); 349 break; 350 case iw_F2I16_type: 351 i = GET_IW_F2I16_A (opcode); 352 break; 353 case iw_F2X4I12_type: 354 i = GET_IW_F2X4I12_A (opcode); 355 break; 356 case iw_F1X4I12_type: 357 i = GET_IW_F1X4I12_A (opcode); 358 break; 359 case iw_F1X4L17_type: 360 i = GET_IW_F1X4L17_A (opcode); 361 break; 362 case iw_F3X6L5_type: 363 case iw_F3X6_type: 364 i = GET_IW_F3X6L5_A (opcode); 365 break; 366 case iw_F2X6L10_type: 367 i = GET_IW_F2X6L10_A (opcode); 368 break; 369 case iw_F3X8_type: 370 i = GET_IW_F3X8_A (opcode); 371 if (GET_IW_F3X8_READA (opcode) == 0) 372 reg_base = nios2_coprocessor_regs (); 373 break; 374 case iw_F1X1_type: 375 i = GET_IW_F1X1_A (opcode); 376 break; 377 case iw_F1I5_type: 378 i = 27; /* Implicit stack pointer reference. */ 379 break; 380 case iw_F2_type: 381 i = GET_IW_F2_A (opcode); 382 break; 383 default: 384 bad_opcode (op); 385 } 386 if (i < NUMREGNAMES) 387 (*info->fprintf_func) (info->stream, "%s", reg_base[i].name); 388 else 389 (*info->fprintf_func) (info->stream, "unknown"); 390 break; 391 392 case 't': 393 reg_base = nios2_regs; 394 switch (op->format) 395 { 396 case iw_r_type: 397 i = GET_IW_R_B (opcode); 398 break; 399 case iw_i_type: 400 i = GET_IW_I_B (opcode); 401 break; 402 case iw_custom_type: 403 i = GET_IW_CUSTOM_B (opcode); 404 if (GET_IW_CUSTOM_READB (opcode) == 0) 405 reg_base = nios2_coprocessor_regs (); 406 break; 407 case iw_F2I16_type: 408 i = GET_IW_F2I16_B (opcode); 409 break; 410 case iw_F2X4I12_type: 411 i = GET_IW_F2X4I12_B (opcode); 412 break; 413 case iw_F3X6L5_type: 414 case iw_F3X6_type: 415 i = GET_IW_F3X6L5_B (opcode); 416 break; 417 case iw_F2X6L10_type: 418 i = GET_IW_F2X6L10_B (opcode); 419 break; 420 case iw_F3X8_type: 421 i = GET_IW_F3X8_B (opcode); 422 if (GET_IW_F3X8_READB (opcode) == 0) 423 reg_base = nios2_coprocessor_regs (); 424 break; 425 case iw_F1I5_type: 426 i = GET_IW_F1I5_B (opcode); 427 break; 428 case iw_F2_type: 429 i = GET_IW_F2_B (opcode); 430 break; 431 case iw_T1X1I6_type: 432 i = 0; 433 break; 434 default: 435 bad_opcode (op); 436 } 437 if (i < NUMREGNAMES) 438 (*info->fprintf_func) (info->stream, "%s", reg_base[i].name); 439 else 440 (*info->fprintf_func) (info->stream, "unknown"); 441 break; 442 443 case 'D': 444 switch (op->format) 445 { 446 case iw_T1I7_type: 447 i = GET_IW_T1I7_A3 (opcode); 448 break; 449 case iw_T2X1L3_type: 450 i = GET_IW_T2X1L3_B3 (opcode); 451 break; 452 case iw_T2X1I3_type: 453 i = GET_IW_T2X1I3_B3 (opcode); 454 break; 455 case iw_T3X1_type: 456 i = GET_IW_T3X1_C3 (opcode); 457 break; 458 case iw_T2X3_type: 459 if (op->num_args == 3) 460 i = GET_IW_T2X3_A3 (opcode); 461 else 462 i = GET_IW_T2X3_B3 (opcode); 463 break; 464 default: 465 bad_opcode (op); 466 } 467 i = nios2_r2_reg3_mappings[i]; 468 (*info->fprintf_func) (info->stream, "%s", nios2_regs[i].name); 469 break; 470 471 case 'M': 472 /* 6-bit unsigned immediate with no shift. */ 473 switch (op->format) 474 { 475 case iw_T1X1I6_type: 476 i = GET_IW_T1X1I6_IMM6 (opcode); 477 break; 478 default: 479 bad_opcode (op); 480 } 481 (*info->fprintf_func) (info->stream, "%ld", i); 482 break; 483 484 case 'N': 485 /* 6-bit unsigned immediate with 2-bit shift. */ 486 switch (op->format) 487 { 488 case iw_T1X1I6_type: 489 i = GET_IW_T1X1I6_IMM6 (opcode) << 2; 490 break; 491 default: 492 bad_opcode (op); 493 } 494 (*info->fprintf_func) (info->stream, "%ld", i); 495 break; 496 497 case 'S': 498 switch (op->format) 499 { 500 case iw_T1I7_type: 501 i = GET_IW_T1I7_A3 (opcode); 502 break; 503 case iw_T2I4_type: 504 i = GET_IW_T2I4_A3 (opcode); 505 break; 506 case iw_T2X1L3_type: 507 i = GET_IW_T2X1L3_A3 (opcode); 508 break; 509 case iw_T2X1I3_type: 510 i = GET_IW_T2X1I3_A3 (opcode); 511 break; 512 case iw_T3X1_type: 513 i = GET_IW_T3X1_A3 (opcode); 514 break; 515 case iw_T2X3_type: 516 i = GET_IW_T2X3_A3 (opcode); 517 break; 518 case iw_T1X1I6_type: 519 i = GET_IW_T1X1I6_A3 (opcode); 520 break; 521 default: 522 bad_opcode (op); 523 } 524 i = nios2_r2_reg3_mappings[i]; 525 (*info->fprintf_func) (info->stream, "%s", nios2_regs[i].name); 526 break; 527 528 case 'T': 529 switch (op->format) 530 { 531 case iw_T2I4_type: 532 i = GET_IW_T2I4_B3 (opcode); 533 break; 534 case iw_T3X1_type: 535 i = GET_IW_T3X1_B3 (opcode); 536 break; 537 case iw_T2X3_type: 538 i = GET_IW_T2X3_B3 (opcode); 539 break; 540 default: 541 bad_opcode (op); 542 } 543 i = nios2_r2_reg3_mappings[i]; 544 (*info->fprintf_func) (info->stream, "%s", nios2_regs[i].name); 545 break; 546 547 case 'i': 548 /* 16-bit signed immediate. */ 549 switch (op->format) 550 { 551 case iw_i_type: 552 i = (signed) (GET_IW_I_IMM16 (opcode) << 16) >> 16; 553 break; 554 case iw_F2I16_type: 555 i = (signed) (GET_IW_F2I16_IMM16 (opcode) << 16) >> 16; 556 break; 557 default: 558 bad_opcode (op); 559 } 560 (*info->fprintf_func) (info->stream, "%ld", i); 561 break; 562 563 case 'I': 564 /* 12-bit signed immediate. */ 565 switch (op->format) 566 { 567 case iw_F2X4I12_type: 568 i = (signed) (GET_IW_F2X4I12_IMM12 (opcode) << 20) >> 20; 569 break; 570 case iw_F1X4I12_type: 571 i = (signed) (GET_IW_F1X4I12_IMM12 (opcode) << 20) >> 20; 572 break; 573 default: 574 bad_opcode (op); 575 } 576 (*info->fprintf_func) (info->stream, "%ld", i); 577 break; 578 579 case 'u': 580 /* 16-bit unsigned immediate. */ 581 switch (op->format) 582 { 583 case iw_i_type: 584 i = GET_IW_I_IMM16 (opcode); 585 break; 586 case iw_F2I16_type: 587 i = GET_IW_F2I16_IMM16 (opcode); 588 break; 589 default: 590 bad_opcode (op); 591 } 592 (*info->fprintf_func) (info->stream, "%ld", i); 593 break; 594 595 case 'U': 596 /* 7-bit unsigned immediate with 2-bit shift. */ 597 switch (op->format) 598 { 599 case iw_T1I7_type: 600 i = GET_IW_T1I7_IMM7 (opcode) << 2; 601 break; 602 case iw_X1I7_type: 603 i = GET_IW_X1I7_IMM7 (opcode) << 2; 604 break; 605 default: 606 bad_opcode (op); 607 } 608 (*info->fprintf_func) (info->stream, "%ld", i); 609 break; 610 611 case 'V': 612 /* 5-bit unsigned immediate with 2-bit shift. */ 613 switch (op->format) 614 { 615 case iw_F1I5_type: 616 i = GET_IW_F1I5_IMM5 (opcode) << 2; 617 break; 618 default: 619 bad_opcode (op); 620 } 621 (*info->fprintf_func) (info->stream, "%ld", i); 622 break; 623 624 case 'W': 625 /* 4-bit unsigned immediate with 2-bit shift. */ 626 switch (op->format) 627 { 628 case iw_T2I4_type: 629 i = GET_IW_T2I4_IMM4 (opcode) << 2; 630 break; 631 case iw_L5I4X1_type: 632 i = GET_IW_L5I4X1_IMM4 (opcode) << 2; 633 break; 634 default: 635 bad_opcode (op); 636 } 637 (*info->fprintf_func) (info->stream, "%ld", i); 638 break; 639 640 case 'X': 641 /* 4-bit unsigned immediate with 1-bit shift. */ 642 switch (op->format) 643 { 644 case iw_T2I4_type: 645 i = GET_IW_T2I4_IMM4 (opcode) << 1; 646 break; 647 default: 648 bad_opcode (op); 649 } 650 (*info->fprintf_func) (info->stream, "%ld", i); 651 break; 652 653 case 'Y': 654 /* 4-bit unsigned immediate without shift. */ 655 switch (op->format) 656 { 657 case iw_T2I4_type: 658 i = GET_IW_T2I4_IMM4 (opcode); 659 break; 660 default: 661 bad_opcode (op); 662 } 663 (*info->fprintf_func) (info->stream, "%ld", i); 664 break; 665 666 case 'o': 667 /* 16-bit signed immediate address offset. */ 668 switch (op->format) 669 { 670 case iw_i_type: 671 i = (signed) (GET_IW_I_IMM16 (opcode) << 16) >> 16; 672 break; 673 case iw_F2I16_type: 674 i = (signed) (GET_IW_F2I16_IMM16 (opcode) << 16) >> 16; 675 break; 676 default: 677 bad_opcode (op); 678 } 679 address = address + 4 + i; 680 (*info->print_address_func) (address, info); 681 break; 682 683 case 'O': 684 /* 10-bit signed address offset with 1-bit shift. */ 685 switch (op->format) 686 { 687 case iw_I10_type: 688 i = (signed) (GET_IW_I10_IMM10 (opcode) << 22) >> 21; 689 break; 690 default: 691 bad_opcode (op); 692 } 693 address = address + 2 + i; 694 (*info->print_address_func) (address, info); 695 break; 696 697 case 'P': 698 /* 7-bit signed address offset with 1-bit shift. */ 699 switch (op->format) 700 { 701 case iw_T1I7_type: 702 i = (signed) (GET_IW_T1I7_IMM7 (opcode) << 25) >> 24; 703 break; 704 default: 705 bad_opcode (op); 706 } 707 address = address + 2 + i; 708 (*info->print_address_func) (address, info); 709 break; 710 711 case 'j': 712 /* 5-bit unsigned immediate. */ 713 switch (op->format) 714 { 715 case iw_r_type: 716 i = GET_IW_R_IMM5 (opcode); 717 break; 718 case iw_F3X6L5_type: 719 i = GET_IW_F3X6L5_IMM5 (opcode); 720 break; 721 case iw_F2X6L10_type: 722 i = GET_IW_F2X6L10_MSB (opcode); 723 break; 724 case iw_X2L5_type: 725 i = GET_IW_X2L5_IMM5 (opcode); 726 break; 727 default: 728 bad_opcode (op); 729 } 730 (*info->fprintf_func) (info->stream, "%ld", i); 731 break; 732 733 case 'k': 734 /* Second 5-bit unsigned immediate field. */ 735 switch (op->format) 736 { 737 case iw_F2X6L10_type: 738 i = GET_IW_F2X6L10_LSB (opcode); 739 break; 740 default: 741 bad_opcode (op); 742 } 743 (*info->fprintf_func) (info->stream, "%ld", i); 744 break; 745 746 case 'l': 747 /* 8-bit unsigned immediate. */ 748 switch (op->format) 749 { 750 case iw_custom_type: 751 i = GET_IW_CUSTOM_N (opcode); 752 break; 753 case iw_F3X8_type: 754 i = GET_IW_F3X8_N (opcode); 755 break; 756 default: 757 bad_opcode (op); 758 } 759 (*info->fprintf_func) (info->stream, "%lu", i); 760 break; 761 762 case 'm': 763 /* 26-bit unsigned immediate. */ 764 switch (op->format) 765 { 766 case iw_j_type: 767 i = GET_IW_J_IMM26 (opcode); 768 break; 769 case iw_L26_type: 770 i = GET_IW_L26_IMM26 (opcode); 771 break; 772 default: 773 bad_opcode (op); 774 } 775 /* This translates to an address because it's only used in call 776 instructions. */ 777 address = (address & 0xf0000000) | (i << 2); 778 (*info->print_address_func) (address, info); 779 break; 780 781 case 'e': 782 /* Encoded enumeration for addi.n/subi.n. */ 783 switch (op->format) 784 { 785 case iw_T2X1I3_type: 786 i = nios2_r2_asi_n_mappings[GET_IW_T2X1I3_IMM3 (opcode)]; 787 break; 788 default: 789 bad_opcode (op); 790 } 791 (*info->fprintf_func) (info->stream, "%lu", i); 792 break; 793 794 case 'f': 795 /* Encoded enumeration for slli.n/srli.n. */ 796 switch (op->format) 797 { 798 case iw_T2X1L3_type: 799 i = nios2_r2_shi_n_mappings[GET_IW_T2X1I3_IMM3 (opcode)]; 800 break; 801 default: 802 bad_opcode (op); 803 } 804 (*info->fprintf_func) (info->stream, "%lu", i); 805 break; 806 807 case 'g': 808 /* Encoded enumeration for andi.n. */ 809 switch (op->format) 810 { 811 case iw_T2I4_type: 812 i = nios2_r2_andi_n_mappings[GET_IW_T2I4_IMM4 (opcode)]; 813 break; 814 default: 815 bad_opcode (op); 816 } 817 (*info->fprintf_func) (info->stream, "%lu", i); 818 break; 819 820 case 'h': 821 /* Encoded enumeration for movi.n. */ 822 switch (op->format) 823 { 824 case iw_T1I7_type: 825 i = GET_IW_T1I7_IMM7 (opcode); 826 if (i == 125) 827 i = 0xff; 828 else if (i == 126) 829 i = -2; 830 else if (i == 127) 831 i = -1; 832 break; 833 default: 834 bad_opcode (op); 835 } 836 (*info->fprintf_func) (info->stream, "%ld", i); 837 break; 838 839 case 'R': 840 { 841 unsigned long reglist = 0; 842 int dir = 1; 843 int k, t; 844 845 switch (op->format) 846 { 847 case iw_F1X4L17_type: 848 /* Encoding for ldwm/stwm. */ 849 i = GET_IW_F1X4L17_REGMASK (opcode); 850 if (GET_IW_F1X4L17_RS (opcode)) 851 { 852 reglist = ((i << 14) & 0x00ffc000); 853 if (i & (1 << 10)) 854 reglist |= (1 << 28); 855 if (i & (1 << 11)) 856 reglist |= (1 << 31); 857 } 858 else 859 reglist = i << 2; 860 dir = GET_IW_F1X4L17_REGMASK (opcode) ? 1 : -1; 861 break; 862 863 case iw_L5I4X1_type: 864 /* Encoding for push.n/pop.n. */ 865 reglist |= (1 << 31); 866 if (GET_IW_L5I4X1_FP (opcode)) 867 reglist |= (1 << 28); 868 if (GET_IW_L5I4X1_CS (opcode)) 869 { 870 int val = GET_IW_L5I4X1_REGRANGE (opcode); 871 reglist |= nios2_r2_reg_range_mappings[val]; 872 } 873 dir = (op->match == MATCH_R2_POP_N ? 1 : -1); 874 break; 875 876 default: 877 bad_opcode (op); 878 } 879 880 t = 0; 881 (*info->fprintf_func) (info->stream, "{"); 882 for (k = (dir == 1 ? 0 : 31); 883 (dir == 1 && k < 32) || (dir == -1 && k >= 0); 884 k += dir) 885 if (reglist & (1 << k)) 886 { 887 if (t) 888 (*info->fprintf_func) (info->stream, ","); 889 else 890 t++; 891 (*info->fprintf_func) (info->stream, "%s", nios2_regs[k].name); 892 } 893 (*info->fprintf_func) (info->stream, "}"); 894 break; 895 } 896 897 case 'B': 898 /* Base register and options for ldwm/stwm. */ 899 switch (op->format) 900 { 901 case iw_F1X4L17_type: 902 if (GET_IW_F1X4L17_ID (opcode) == 0) 903 (*info->fprintf_func) (info->stream, "--"); 904 905 i = GET_IW_F1X4I12_A (opcode); 906 (*info->fprintf_func) (info->stream, "(%s)", 907 nios2_builtin_regs[i].name); 908 909 if (GET_IW_F1X4L17_ID (opcode)) 910 (*info->fprintf_func) (info->stream, "++"); 911 if (GET_IW_F1X4L17_WB (opcode)) 912 (*info->fprintf_func) (info->stream, ",writeback"); 913 if (GET_IW_F1X4L17_PC (opcode)) 914 (*info->fprintf_func) (info->stream, ",ret"); 915 break; 916 default: 917 bad_opcode (op); 918 } 919 break; 920 921 default: 922 (*info->fprintf_func) (info->stream, "unknown"); 923 break; 924 } 925 return 0; 926 } 927 928 /* nios2_disassemble does all the work of disassembling a Nios II 929 instruction opcode. */ 930 static int 931 nios2_disassemble (bfd_vma address, unsigned long opcode, 932 disassemble_info *info) 933 { 934 const struct nios2_opcode *op; 935 936 info->bytes_per_line = INSNLEN; 937 info->bytes_per_chunk = INSNLEN; 938 info->display_endian = info->endian; 939 info->insn_info_valid = 1; 940 info->branch_delay_insns = 0; 941 info->data_size = 0; 942 info->insn_type = dis_nonbranch; 943 info->target = 0; 944 info->target2 = 0; 945 946 /* Find the major opcode and use this to disassemble 947 the instruction and its arguments. */ 948 op = nios2_find_opcode_hash (opcode, info->mach); 949 950 if (op != NULL) 951 { 952 const char *argstr = op->args; 953 (*info->fprintf_func) (info->stream, "%s", op->name); 954 if (argstr != NULL && *argstr != '\0') 955 { 956 (*info->fprintf_func) (info->stream, "\t"); 957 while (*argstr != '\0') 958 { 959 nios2_print_insn_arg (argstr, opcode, address, info, op); 960 ++argstr; 961 } 962 } 963 /* Tell the caller how far to advance the program counter. */ 964 info->bytes_per_chunk = op->size; 965 return op->size; 966 } 967 else 968 { 969 /* Handle undefined instructions. */ 970 info->insn_type = dis_noninsn; 971 (*info->fprintf_func) (info->stream, "0x%lx", opcode); 972 return INSNLEN; 973 } 974 } 975 976 977 /* print_insn_nios2 is the main disassemble function for Nios II. 978 The function diassembler(abfd) (source in disassemble.c) returns a 979 pointer to this either print_insn_big_nios2 or 980 print_insn_little_nios2, which in turn call this function when the 981 bfd machine type is Nios II. print_insn_nios2 reads the 982 instruction word at the address given, and prints the disassembled 983 instruction on the stream info->stream using info->fprintf_func. */ 984 985 static int 986 print_insn_nios2 (bfd_vma address, disassemble_info *info, 987 enum bfd_endian endianness) 988 { 989 bfd_byte buffer[INSNLEN]; 990 int status; 991 992 status = (*info->read_memory_func) (address, buffer, INSNLEN, info); 993 if (status == 0) 994 { 995 unsigned long insn; 996 if (endianness == BFD_ENDIAN_BIG) 997 insn = (unsigned long) bfd_getb32 (buffer); 998 else 999 insn = (unsigned long) bfd_getl32 (buffer); 1000 return nios2_disassemble (address, insn, info); 1001 } 1002 1003 /* We might have a 16-bit R2 instruction at the end of memory. Try that. */ 1004 if (info->mach == bfd_mach_nios2r2) 1005 { 1006 status = (*info->read_memory_func) (address, buffer, 2, info); 1007 if (status == 0) 1008 { 1009 unsigned long insn; 1010 if (endianness == BFD_ENDIAN_BIG) 1011 insn = (unsigned long) bfd_getb16 (buffer); 1012 else 1013 insn = (unsigned long) bfd_getl16 (buffer); 1014 return nios2_disassemble (address, insn, info); 1015 } 1016 } 1017 1018 /* If we got here, we couldn't read anything. */ 1019 (*info->memory_error_func) (status, address, info); 1020 return -1; 1021 } 1022 1023 /* These two functions are the main entry points, accessed from 1024 disassemble.c. */ 1025 int 1026 print_insn_big_nios2 (bfd_vma address, disassemble_info *info) 1027 { 1028 return print_insn_nios2 (address, info, BFD_ENDIAN_BIG); 1029 } 1030 1031 int 1032 print_insn_little_nios2 (bfd_vma address, disassemble_info *info) 1033 { 1034 return print_insn_nios2 (address, info, BFD_ENDIAN_LITTLE); 1035 } 1036
