nios2-dis.c revision 1.1.1.8
1 /* Altera Nios II disassemble routines 2 Copyright (C) 2012-2022 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 "disassemble.h" 25 #include "opintl.h" 26 #include "opcode/nios2.h" 27 #include "libiberty.h" 28 #include <string.h> 29 #include <assert.h> 30 31 /* No symbol table is available when this code runs out in an embedded 32 system as when it is used for disassembler support in a monitor. */ 33 #if !defined(EMBEDDED_ENV) 34 #define SYMTAB_AVAILABLE 1 35 #include "elf-bfd.h" 36 #include "elf/nios2.h" 37 #endif 38 39 /* Default length of Nios II instruction in bytes. */ 40 #define INSNLEN 4 41 42 /* Data structures used by the opcode hash table. */ 43 typedef struct _nios2_opcode_hash 44 { 45 const struct nios2_opcode *opcode; 46 struct _nios2_opcode_hash *next; 47 } nios2_opcode_hash; 48 49 /* Hash table size. */ 50 #define OPCODE_HASH_SIZE (IW_R1_OP_UNSHIFTED_MASK + 1) 51 52 /* Extract the opcode from an instruction word. */ 53 static unsigned int 54 nios2_r1_extract_opcode (unsigned int x) 55 { 56 return GET_IW_R1_OP (x); 57 } 58 59 static unsigned int 60 nios2_r2_extract_opcode (unsigned int x) 61 { 62 return GET_IW_R2_OP (x); 63 } 64 65 /* We maintain separate hash tables for R1 and R2 opcodes, and pseudo-ops 66 are stored in a different table than regular instructions. */ 67 68 typedef struct _nios2_disassembler_state 69 { 70 const struct nios2_opcode *opcodes; 71 const int *num_opcodes; 72 unsigned int (*extract_opcode) (unsigned int); 73 nios2_opcode_hash *hash[OPCODE_HASH_SIZE]; 74 nios2_opcode_hash *ps_hash[OPCODE_HASH_SIZE]; 75 const struct nios2_opcode *nop; 76 bool init; 77 } nios2_disassembler_state; 78 79 static nios2_disassembler_state 80 nios2_r1_disassembler_state = { 81 nios2_r1_opcodes, 82 &nios2_num_r1_opcodes, 83 nios2_r1_extract_opcode, 84 {}, 85 {}, 86 NULL, 87 0 88 }; 89 90 static nios2_disassembler_state 91 nios2_r2_disassembler_state = { 92 nios2_r2_opcodes, 93 &nios2_num_r2_opcodes, 94 nios2_r2_extract_opcode, 95 {}, 96 {}, 97 NULL, 98 0 99 }; 100 101 /* Function to initialize the opcode hash table. */ 102 static void 103 nios2_init_opcode_hash (nios2_disassembler_state *state) 104 { 105 unsigned int i; 106 register const struct nios2_opcode *op; 107 108 for (i = 0; i < OPCODE_HASH_SIZE; i++) 109 for (op = state->opcodes; op < &state->opcodes[*(state->num_opcodes)]; op++) 110 { 111 nios2_opcode_hash *new_hash; 112 nios2_opcode_hash **bucket = NULL; 113 114 if ((op->pinfo & NIOS2_INSN_MACRO) == NIOS2_INSN_MACRO) 115 { 116 if (i == state->extract_opcode (op->match) 117 && (op->pinfo & (NIOS2_INSN_MACRO_MOV | NIOS2_INSN_MACRO_MOVI) 118 & 0x7fffffff)) 119 { 120 bucket = &(state->ps_hash[i]); 121 if (strcmp (op->name, "nop") == 0) 122 state->nop = op; 123 } 124 } 125 else if (i == state->extract_opcode (op->match)) 126 bucket = &(state->hash[i]); 127 128 if (bucket) 129 { 130 new_hash = 131 (nios2_opcode_hash *) malloc (sizeof (nios2_opcode_hash)); 132 if (new_hash == NULL) 133 { 134 /* xgettext:c-format */ 135 opcodes_error_handler (_("out of memory")); 136 exit (1); 137 } 138 new_hash->opcode = op; 139 new_hash->next = NULL; 140 while (*bucket) 141 bucket = &((*bucket)->next); 142 *bucket = new_hash; 143 } 144 } 145 state->init = 1; 146 147 #ifdef DEBUG_HASHTABLE 148 for (i = 0; i < OPCODE_HASH_SIZE; ++i) 149 { 150 nios2_opcode_hash *tmp_hash = state->hash[i]; 151 printf ("index: 0x%02X ops: ", i); 152 while (tmp_hash != NULL) 153 { 154 printf ("%s ", tmp_hash->opcode->name); 155 tmp_hash = tmp_hash->next; 156 } 157 printf ("\n"); 158 } 159 160 for (i = 0; i < OPCODE_HASH_SIZE; ++i) 161 { 162 nios2_opcode_hash *tmp_hash = state->ps_hash[i]; 163 printf ("index: 0x%02X ops: ", i); 164 while (tmp_hash != NULL) 165 { 166 printf ("%s ", tmp_hash->opcode->name); 167 tmp_hash = tmp_hash->next; 168 } 169 printf ("\n"); 170 } 171 #endif /* DEBUG_HASHTABLE */ 172 } 173 174 /* Return a pointer to an nios2_opcode struct for a given instruction 175 word OPCODE for bfd machine MACH, or NULL if there is an error. */ 176 const struct nios2_opcode * 177 nios2_find_opcode_hash (unsigned long opcode, unsigned long mach) 178 { 179 nios2_opcode_hash *entry; 180 nios2_disassembler_state *state; 181 182 /* Select the right instruction set, hash tables, and opcode accessor 183 for the mach variant. */ 184 if (mach == bfd_mach_nios2r2) 185 state = &nios2_r2_disassembler_state; 186 else 187 state = &nios2_r1_disassembler_state; 188 189 /* Build a hash table to shorten the search time. */ 190 if (!state->init) 191 nios2_init_opcode_hash (state); 192 193 /* Check for NOP first. Both NOP and MOV are macros that expand into 194 an ADD instruction, and we always want to give priority to NOP. */ 195 if (state->nop->match == (opcode & state->nop->mask)) 196 return state->nop; 197 198 /* First look in the pseudo-op hashtable. */ 199 for (entry = state->ps_hash[state->extract_opcode (opcode)]; 200 entry; entry = entry->next) 201 if (entry->opcode->match == (opcode & entry->opcode->mask)) 202 return entry->opcode; 203 204 /* Otherwise look in the main hashtable. */ 205 for (entry = state->hash[state->extract_opcode (opcode)]; 206 entry; entry = entry->next) 207 if (entry->opcode->match == (opcode & entry->opcode->mask)) 208 return entry->opcode; 209 210 return NULL; 211 } 212 213 /* There are 32 regular registers, 32 coprocessor registers, 214 and 32 control registers. */ 215 #define NUMREGNAMES 32 216 217 /* Return a pointer to the base of the coprocessor register name array. */ 218 static struct nios2_reg * 219 nios2_coprocessor_regs (void) 220 { 221 static struct nios2_reg *cached = NULL; 222 223 if (!cached) 224 { 225 int i; 226 for (i = NUMREGNAMES; i < nios2_num_regs; i++) 227 if (!strcmp (nios2_regs[i].name, "c0")) 228 { 229 cached = nios2_regs + i; 230 break; 231 } 232 assert (cached); 233 } 234 return cached; 235 } 236 237 /* Return a pointer to the base of the control register name array. */ 238 static struct nios2_reg * 239 nios2_control_regs (void) 240 { 241 static struct nios2_reg *cached = NULL; 242 243 if (!cached) 244 { 245 int i; 246 for (i = NUMREGNAMES; i < nios2_num_regs; i++) 247 if (!strcmp (nios2_regs[i].name, "status")) 248 { 249 cached = nios2_regs + i; 250 break; 251 } 252 assert (cached); 253 } 254 return cached; 255 } 256 257 /* Helper routine to report internal errors. */ 258 static void 259 bad_opcode (const struct nios2_opcode *op) 260 { 261 opcodes_error_handler 262 /* xgettext:c-format */ 263 (_("internal error: broken opcode descriptor for `%s %s'"), 264 op->name, op->args); 265 abort (); 266 } 267 268 /* The function nios2_print_insn_arg uses the character pointed 269 to by ARGPTR to determine how it print the next token or separator 270 character in the arguments to an instruction. */ 271 static int 272 nios2_print_insn_arg (const char *argptr, 273 unsigned long opcode, bfd_vma address, 274 disassemble_info *info, 275 const struct nios2_opcode *op) 276 { 277 unsigned long i = 0; 278 long s = 0; 279 int32_t o = 0; 280 struct nios2_reg *reg_base; 281 282 switch (*argptr) 283 { 284 case ',': 285 case '(': 286 case ')': 287 (*info->fprintf_func) (info->stream, "%c", *argptr); 288 break; 289 290 case 'c': 291 /* Control register index. */ 292 switch (op->format) 293 { 294 case iw_r_type: 295 i = GET_IW_R_IMM5 (opcode); 296 break; 297 case iw_F3X6L5_type: 298 i = GET_IW_F3X6L5_IMM5 (opcode); 299 break; 300 default: 301 bad_opcode (op); 302 } 303 reg_base = nios2_control_regs (); 304 (*info->fprintf_func) (info->stream, "%s", reg_base[i].name); 305 break; 306 307 case 'd': 308 reg_base = nios2_regs; 309 switch (op->format) 310 { 311 case iw_r_type: 312 i = GET_IW_R_C (opcode); 313 break; 314 case iw_custom_type: 315 i = GET_IW_CUSTOM_C (opcode); 316 if (GET_IW_CUSTOM_READC (opcode) == 0) 317 reg_base = nios2_coprocessor_regs (); 318 break; 319 case iw_F3X6L5_type: 320 case iw_F3X6_type: 321 i = GET_IW_F3X6L5_C (opcode); 322 break; 323 case iw_F3X8_type: 324 i = GET_IW_F3X8_C (opcode); 325 if (GET_IW_F3X8_READC (opcode) == 0) 326 reg_base = nios2_coprocessor_regs (); 327 break; 328 case iw_F2_type: 329 i = GET_IW_F2_B (opcode); 330 break; 331 default: 332 bad_opcode (op); 333 } 334 if (i < NUMREGNAMES) 335 (*info->fprintf_func) (info->stream, "%s", reg_base[i].name); 336 else 337 (*info->fprintf_func) (info->stream, "unknown"); 338 break; 339 340 case 's': 341 reg_base = nios2_regs; 342 switch (op->format) 343 { 344 case iw_r_type: 345 i = GET_IW_R_A (opcode); 346 break; 347 case iw_i_type: 348 i = GET_IW_I_A (opcode); 349 break; 350 case iw_custom_type: 351 i = GET_IW_CUSTOM_A (opcode); 352 if (GET_IW_CUSTOM_READA (opcode) == 0) 353 reg_base = nios2_coprocessor_regs (); 354 break; 355 case iw_F2I16_type: 356 i = GET_IW_F2I16_A (opcode); 357 break; 358 case iw_F2X4I12_type: 359 i = GET_IW_F2X4I12_A (opcode); 360 break; 361 case iw_F1X4I12_type: 362 i = GET_IW_F1X4I12_A (opcode); 363 break; 364 case iw_F1X4L17_type: 365 i = GET_IW_F1X4L17_A (opcode); 366 break; 367 case iw_F3X6L5_type: 368 case iw_F3X6_type: 369 i = GET_IW_F3X6L5_A (opcode); 370 break; 371 case iw_F2X6L10_type: 372 i = GET_IW_F2X6L10_A (opcode); 373 break; 374 case iw_F3X8_type: 375 i = GET_IW_F3X8_A (opcode); 376 if (GET_IW_F3X8_READA (opcode) == 0) 377 reg_base = nios2_coprocessor_regs (); 378 break; 379 case iw_F1X1_type: 380 i = GET_IW_F1X1_A (opcode); 381 break; 382 case iw_F1I5_type: 383 i = 27; /* Implicit stack pointer reference. */ 384 break; 385 case iw_F2_type: 386 i = GET_IW_F2_A (opcode); 387 break; 388 default: 389 bad_opcode (op); 390 } 391 if (i < NUMREGNAMES) 392 (*info->fprintf_func) (info->stream, "%s", reg_base[i].name); 393 else 394 (*info->fprintf_func) (info->stream, "unknown"); 395 break; 396 397 case 't': 398 reg_base = nios2_regs; 399 switch (op->format) 400 { 401 case iw_r_type: 402 i = GET_IW_R_B (opcode); 403 break; 404 case iw_i_type: 405 i = GET_IW_I_B (opcode); 406 break; 407 case iw_custom_type: 408 i = GET_IW_CUSTOM_B (opcode); 409 if (GET_IW_CUSTOM_READB (opcode) == 0) 410 reg_base = nios2_coprocessor_regs (); 411 break; 412 case iw_F2I16_type: 413 i = GET_IW_F2I16_B (opcode); 414 break; 415 case iw_F2X4I12_type: 416 i = GET_IW_F2X4I12_B (opcode); 417 break; 418 case iw_F3X6L5_type: 419 case iw_F3X6_type: 420 i = GET_IW_F3X6L5_B (opcode); 421 break; 422 case iw_F2X6L10_type: 423 i = GET_IW_F2X6L10_B (opcode); 424 break; 425 case iw_F3X8_type: 426 i = GET_IW_F3X8_B (opcode); 427 if (GET_IW_F3X8_READB (opcode) == 0) 428 reg_base = nios2_coprocessor_regs (); 429 break; 430 case iw_F1I5_type: 431 i = GET_IW_F1I5_B (opcode); 432 break; 433 case iw_F2_type: 434 i = GET_IW_F2_B (opcode); 435 break; 436 case iw_T1X1I6_type: 437 i = 0; 438 break; 439 default: 440 bad_opcode (op); 441 } 442 if (i < NUMREGNAMES) 443 (*info->fprintf_func) (info->stream, "%s", reg_base[i].name); 444 else 445 (*info->fprintf_func) (info->stream, "unknown"); 446 break; 447 448 case 'D': 449 switch (op->format) 450 { 451 case iw_T1I7_type: 452 i = GET_IW_T1I7_A3 (opcode); 453 break; 454 case iw_T2X1L3_type: 455 i = GET_IW_T2X1L3_B3 (opcode); 456 break; 457 case iw_T2X1I3_type: 458 i = GET_IW_T2X1I3_B3 (opcode); 459 break; 460 case iw_T3X1_type: 461 i = GET_IW_T3X1_C3 (opcode); 462 break; 463 case iw_T2X3_type: 464 if (op->num_args == 3) 465 i = GET_IW_T2X3_A3 (opcode); 466 else 467 i = GET_IW_T2X3_B3 (opcode); 468 break; 469 default: 470 bad_opcode (op); 471 } 472 i = nios2_r2_reg3_mappings[i]; 473 (*info->fprintf_func) (info->stream, "%s", nios2_regs[i].name); 474 break; 475 476 case 'M': 477 /* 6-bit unsigned immediate with no shift. */ 478 switch (op->format) 479 { 480 case iw_T1X1I6_type: 481 i = GET_IW_T1X1I6_IMM6 (opcode); 482 break; 483 default: 484 bad_opcode (op); 485 } 486 (*info->fprintf_func) (info->stream, "%ld", i); 487 break; 488 489 case 'N': 490 /* 6-bit unsigned immediate with 2-bit shift. */ 491 switch (op->format) 492 { 493 case iw_T1X1I6_type: 494 i = GET_IW_T1X1I6_IMM6 (opcode) << 2; 495 break; 496 default: 497 bad_opcode (op); 498 } 499 (*info->fprintf_func) (info->stream, "%ld", i); 500 break; 501 502 case 'S': 503 switch (op->format) 504 { 505 case iw_T1I7_type: 506 i = GET_IW_T1I7_A3 (opcode); 507 break; 508 case iw_T2I4_type: 509 i = GET_IW_T2I4_A3 (opcode); 510 break; 511 case iw_T2X1L3_type: 512 i = GET_IW_T2X1L3_A3 (opcode); 513 break; 514 case iw_T2X1I3_type: 515 i = GET_IW_T2X1I3_A3 (opcode); 516 break; 517 case iw_T3X1_type: 518 i = GET_IW_T3X1_A3 (opcode); 519 break; 520 case iw_T2X3_type: 521 i = GET_IW_T2X3_A3 (opcode); 522 break; 523 case iw_T1X1I6_type: 524 i = GET_IW_T1X1I6_A3 (opcode); 525 break; 526 default: 527 bad_opcode (op); 528 } 529 i = nios2_r2_reg3_mappings[i]; 530 (*info->fprintf_func) (info->stream, "%s", nios2_regs[i].name); 531 break; 532 533 case 'T': 534 switch (op->format) 535 { 536 case iw_T2I4_type: 537 i = GET_IW_T2I4_B3 (opcode); 538 break; 539 case iw_T3X1_type: 540 i = GET_IW_T3X1_B3 (opcode); 541 break; 542 case iw_T2X3_type: 543 i = GET_IW_T2X3_B3 (opcode); 544 break; 545 default: 546 bad_opcode (op); 547 } 548 i = nios2_r2_reg3_mappings[i]; 549 (*info->fprintf_func) (info->stream, "%s", nios2_regs[i].name); 550 break; 551 552 case 'i': 553 /* 16-bit signed immediate. */ 554 switch (op->format) 555 { 556 case iw_i_type: 557 s = ((int32_t) ((GET_IW_I_IMM16 (opcode) & 0xffff) ^ 0x8000) 558 - 0x8000); 559 break; 560 case iw_F2I16_type: 561 s = ((int32_t) ((GET_IW_F2I16_IMM16 (opcode) & 0xffff) ^ 0x8000) 562 - 0x8000); 563 break; 564 default: 565 bad_opcode (op); 566 } 567 (*info->fprintf_func) (info->stream, "%ld", s); 568 break; 569 570 case 'I': 571 /* 12-bit signed immediate. */ 572 switch (op->format) 573 { 574 case iw_F2X4I12_type: 575 s = ((int32_t) ((GET_IW_F2X4I12_IMM12 (opcode) & 0xfff) ^ 0x800) 576 - 0x800); 577 break; 578 case iw_F1X4I12_type: 579 s = ((int32_t) ((GET_IW_F1X4I12_IMM12 (opcode) & 0xfff) ^ 0x800) 580 - 0x800); 581 break; 582 default: 583 bad_opcode (op); 584 } 585 (*info->fprintf_func) (info->stream, "%ld", s); 586 break; 587 588 case 'u': 589 /* 16-bit unsigned immediate. */ 590 switch (op->format) 591 { 592 case iw_i_type: 593 i = GET_IW_I_IMM16 (opcode); 594 break; 595 case iw_F2I16_type: 596 i = GET_IW_F2I16_IMM16 (opcode); 597 break; 598 default: 599 bad_opcode (op); 600 } 601 (*info->fprintf_func) (info->stream, "%ld", i); 602 break; 603 604 case 'U': 605 /* 7-bit unsigned immediate with 2-bit shift. */ 606 switch (op->format) 607 { 608 case iw_T1I7_type: 609 i = GET_IW_T1I7_IMM7 (opcode) << 2; 610 break; 611 case iw_X1I7_type: 612 i = GET_IW_X1I7_IMM7 (opcode) << 2; 613 break; 614 default: 615 bad_opcode (op); 616 } 617 (*info->fprintf_func) (info->stream, "%ld", i); 618 break; 619 620 case 'V': 621 /* 5-bit unsigned immediate with 2-bit shift. */ 622 switch (op->format) 623 { 624 case iw_F1I5_type: 625 i = GET_IW_F1I5_IMM5 (opcode) << 2; 626 break; 627 default: 628 bad_opcode (op); 629 } 630 (*info->fprintf_func) (info->stream, "%ld", i); 631 break; 632 633 case 'W': 634 /* 4-bit unsigned immediate with 2-bit shift. */ 635 switch (op->format) 636 { 637 case iw_T2I4_type: 638 i = GET_IW_T2I4_IMM4 (opcode) << 2; 639 break; 640 case iw_L5I4X1_type: 641 i = GET_IW_L5I4X1_IMM4 (opcode) << 2; 642 break; 643 default: 644 bad_opcode (op); 645 } 646 (*info->fprintf_func) (info->stream, "%ld", i); 647 break; 648 649 case 'X': 650 /* 4-bit unsigned immediate with 1-bit shift. */ 651 switch (op->format) 652 { 653 case iw_T2I4_type: 654 i = GET_IW_T2I4_IMM4 (opcode) << 1; 655 break; 656 default: 657 bad_opcode (op); 658 } 659 (*info->fprintf_func) (info->stream, "%ld", i); 660 break; 661 662 case 'Y': 663 /* 4-bit unsigned immediate without shift. */ 664 switch (op->format) 665 { 666 case iw_T2I4_type: 667 i = GET_IW_T2I4_IMM4 (opcode); 668 break; 669 default: 670 bad_opcode (op); 671 } 672 (*info->fprintf_func) (info->stream, "%ld", i); 673 break; 674 675 case 'o': 676 /* 16-bit signed immediate address offset. */ 677 switch (op->format) 678 { 679 case iw_i_type: 680 o = ((GET_IW_I_IMM16 (opcode) & 0xffff) ^ 0x8000) - 0x8000; 681 break; 682 case iw_F2I16_type: 683 o = ((GET_IW_F2I16_IMM16 (opcode) & 0xffff) ^ 0x8000) - 0x8000; 684 break; 685 default: 686 bad_opcode (op); 687 } 688 address = address + 4 + o; 689 (*info->print_address_func) (address, info); 690 break; 691 692 case 'O': 693 /* 10-bit signed address offset with 1-bit shift. */ 694 switch (op->format) 695 { 696 case iw_I10_type: 697 o = (((GET_IW_I10_IMM10 (opcode) & 0x3ff) ^ 0x200) - 0x200) * 2; 698 break; 699 default: 700 bad_opcode (op); 701 } 702 address = address + 2 + o; 703 (*info->print_address_func) (address, info); 704 break; 705 706 case 'P': 707 /* 7-bit signed address offset with 1-bit shift. */ 708 switch (op->format) 709 { 710 case iw_T1I7_type: 711 o = (((GET_IW_T1I7_IMM7 (opcode) & 0x7f) ^ 0x40) - 0x40) * 2; 712 break; 713 default: 714 bad_opcode (op); 715 } 716 address = address + 2 + o; 717 (*info->print_address_func) (address, info); 718 break; 719 720 case 'j': 721 /* 5-bit unsigned immediate. */ 722 switch (op->format) 723 { 724 case iw_r_type: 725 i = GET_IW_R_IMM5 (opcode); 726 break; 727 case iw_F3X6L5_type: 728 i = GET_IW_F3X6L5_IMM5 (opcode); 729 break; 730 case iw_F2X6L10_type: 731 i = GET_IW_F2X6L10_MSB (opcode); 732 break; 733 case iw_X2L5_type: 734 i = GET_IW_X2L5_IMM5 (opcode); 735 break; 736 default: 737 bad_opcode (op); 738 } 739 (*info->fprintf_func) (info->stream, "%ld", i); 740 break; 741 742 case 'k': 743 /* Second 5-bit unsigned immediate field. */ 744 switch (op->format) 745 { 746 case iw_F2X6L10_type: 747 i = GET_IW_F2X6L10_LSB (opcode); 748 break; 749 default: 750 bad_opcode (op); 751 } 752 (*info->fprintf_func) (info->stream, "%ld", i); 753 break; 754 755 case 'l': 756 /* 8-bit unsigned immediate. */ 757 switch (op->format) 758 { 759 case iw_custom_type: 760 i = GET_IW_CUSTOM_N (opcode); 761 break; 762 case iw_F3X8_type: 763 i = GET_IW_F3X8_N (opcode); 764 break; 765 default: 766 bad_opcode (op); 767 } 768 (*info->fprintf_func) (info->stream, "%lu", i); 769 break; 770 771 case 'm': 772 /* 26-bit unsigned immediate. */ 773 switch (op->format) 774 { 775 case iw_j_type: 776 i = GET_IW_J_IMM26 (opcode); 777 break; 778 case iw_L26_type: 779 i = GET_IW_L26_IMM26 (opcode); 780 break; 781 default: 782 bad_opcode (op); 783 } 784 /* This translates to an address because it's only used in call 785 instructions. */ 786 address = (address & 0xf0000000) | (i << 2); 787 (*info->print_address_func) (address, info); 788 break; 789 790 case 'e': 791 /* Encoded enumeration for addi.n/subi.n. */ 792 switch (op->format) 793 { 794 case iw_T2X1I3_type: 795 i = nios2_r2_asi_n_mappings[GET_IW_T2X1I3_IMM3 (opcode)]; 796 break; 797 default: 798 bad_opcode (op); 799 } 800 (*info->fprintf_func) (info->stream, "%lu", i); 801 break; 802 803 case 'f': 804 /* Encoded enumeration for slli.n/srli.n. */ 805 switch (op->format) 806 { 807 case iw_T2X1L3_type: 808 i = nios2_r2_shi_n_mappings[GET_IW_T2X1I3_IMM3 (opcode)]; 809 break; 810 default: 811 bad_opcode (op); 812 } 813 (*info->fprintf_func) (info->stream, "%lu", i); 814 break; 815 816 case 'g': 817 /* Encoded enumeration for andi.n. */ 818 switch (op->format) 819 { 820 case iw_T2I4_type: 821 i = nios2_r2_andi_n_mappings[GET_IW_T2I4_IMM4 (opcode)]; 822 break; 823 default: 824 bad_opcode (op); 825 } 826 (*info->fprintf_func) (info->stream, "%lu", i); 827 break; 828 829 case 'h': 830 /* Encoded enumeration for movi.n. */ 831 switch (op->format) 832 { 833 case iw_T1I7_type: 834 i = GET_IW_T1I7_IMM7 (opcode); 835 if (i == 125) 836 i = 0xff; 837 else if (i == 126) 838 i = -2; 839 else if (i == 127) 840 i = -1; 841 break; 842 default: 843 bad_opcode (op); 844 } 845 (*info->fprintf_func) (info->stream, "%ld", i); 846 break; 847 848 case 'R': 849 { 850 unsigned long reglist = 0; 851 int dir = 1; 852 int k, t; 853 854 switch (op->format) 855 { 856 case iw_F1X4L17_type: 857 /* Encoding for ldwm/stwm. */ 858 i = GET_IW_F1X4L17_REGMASK (opcode); 859 if (GET_IW_F1X4L17_RS (opcode)) 860 { 861 reglist = ((i << 14) & 0x00ffc000); 862 if (i & (1 << 10)) 863 reglist |= (1 << 28); 864 if (i & (1 << 11)) 865 reglist |= (1u << 31); 866 } 867 else 868 reglist = i << 2; 869 dir = GET_IW_F1X4L17_REGMASK (opcode) ? 1 : -1; 870 break; 871 872 case iw_L5I4X1_type: 873 /* Encoding for push.n/pop.n. */ 874 reglist |= (1u << 31); 875 if (GET_IW_L5I4X1_FP (opcode)) 876 reglist |= (1 << 28); 877 if (GET_IW_L5I4X1_CS (opcode)) 878 { 879 int val = GET_IW_L5I4X1_REGRANGE (opcode); 880 reglist |= nios2_r2_reg_range_mappings[val]; 881 } 882 dir = (op->match == MATCH_R2_POP_N ? 1 : -1); 883 break; 884 885 default: 886 bad_opcode (op); 887 } 888 889 t = 0; 890 (*info->fprintf_func) (info->stream, "{"); 891 for (k = (dir == 1 ? 0 : 31); 892 (dir == 1 && k < 32) || (dir == -1 && k >= 0); 893 k += dir) 894 if (reglist & (1u << k)) 895 { 896 if (t) 897 (*info->fprintf_func) (info->stream, ","); 898 else 899 t++; 900 (*info->fprintf_func) (info->stream, "%s", nios2_regs[k].name); 901 } 902 (*info->fprintf_func) (info->stream, "}"); 903 break; 904 } 905 906 case 'B': 907 /* Base register and options for ldwm/stwm. */ 908 switch (op->format) 909 { 910 case iw_F1X4L17_type: 911 if (GET_IW_F1X4L17_ID (opcode) == 0) 912 (*info->fprintf_func) (info->stream, "--"); 913 914 i = GET_IW_F1X4I12_A (opcode); 915 (*info->fprintf_func) (info->stream, "(%s)", 916 nios2_builtin_regs[i].name); 917 918 if (GET_IW_F1X4L17_ID (opcode)) 919 (*info->fprintf_func) (info->stream, "++"); 920 if (GET_IW_F1X4L17_WB (opcode)) 921 (*info->fprintf_func) (info->stream, ",writeback"); 922 if (GET_IW_F1X4L17_PC (opcode)) 923 (*info->fprintf_func) (info->stream, ",ret"); 924 break; 925 default: 926 bad_opcode (op); 927 } 928 break; 929 930 default: 931 (*info->fprintf_func) (info->stream, "unknown"); 932 break; 933 } 934 return 0; 935 } 936 937 /* nios2_disassemble does all the work of disassembling a Nios II 938 instruction opcode. */ 939 static int 940 nios2_disassemble (bfd_vma address, unsigned long opcode, 941 disassemble_info *info) 942 { 943 const struct nios2_opcode *op; 944 945 info->bytes_per_line = INSNLEN; 946 info->bytes_per_chunk = INSNLEN; 947 info->display_endian = info->endian; 948 info->insn_info_valid = 1; 949 info->branch_delay_insns = 0; 950 info->data_size = 0; 951 info->insn_type = dis_nonbranch; 952 info->target = 0; 953 info->target2 = 0; 954 955 /* Find the major opcode and use this to disassemble 956 the instruction and its arguments. */ 957 op = nios2_find_opcode_hash (opcode, info->mach); 958 959 if (op != NULL) 960 { 961 const char *argstr = op->args; 962 (*info->fprintf_func) (info->stream, "%s", op->name); 963 if (argstr != NULL && *argstr != '\0') 964 { 965 (*info->fprintf_func) (info->stream, "\t"); 966 while (*argstr != '\0') 967 { 968 nios2_print_insn_arg (argstr, opcode, address, info, op); 969 ++argstr; 970 } 971 } 972 /* Tell the caller how far to advance the program counter. */ 973 info->bytes_per_chunk = op->size; 974 return op->size; 975 } 976 else 977 { 978 /* Handle undefined instructions. */ 979 info->insn_type = dis_noninsn; 980 (*info->fprintf_func) (info->stream, "0x%lx", opcode); 981 return INSNLEN; 982 } 983 } 984 985 986 /* print_insn_nios2 is the main disassemble function for Nios II. 987 The function diassembler(abfd) (source in disassemble.c) returns a 988 pointer to this either print_insn_big_nios2 or 989 print_insn_little_nios2, which in turn call this function when the 990 bfd machine type is Nios II. print_insn_nios2 reads the 991 instruction word at the address given, and prints the disassembled 992 instruction on the stream info->stream using info->fprintf_func. */ 993 994 static int 995 print_insn_nios2 (bfd_vma address, disassemble_info *info, 996 enum bfd_endian endianness) 997 { 998 bfd_byte buffer[INSNLEN]; 999 int status; 1000 1001 status = (*info->read_memory_func) (address, buffer, INSNLEN, info); 1002 if (status == 0) 1003 { 1004 unsigned long insn; 1005 if (endianness == BFD_ENDIAN_BIG) 1006 insn = (unsigned long) bfd_getb32 (buffer); 1007 else 1008 insn = (unsigned long) bfd_getl32 (buffer); 1009 return nios2_disassemble (address, insn, info); 1010 } 1011 1012 /* We might have a 16-bit R2 instruction at the end of memory. Try that. */ 1013 if (info->mach == bfd_mach_nios2r2) 1014 { 1015 status = (*info->read_memory_func) (address, buffer, 2, info); 1016 if (status == 0) 1017 { 1018 unsigned long insn; 1019 if (endianness == BFD_ENDIAN_BIG) 1020 insn = (unsigned long) bfd_getb16 (buffer); 1021 else 1022 insn = (unsigned long) bfd_getl16 (buffer); 1023 return nios2_disassemble (address, insn, info); 1024 } 1025 } 1026 1027 /* If we got here, we couldn't read anything. */ 1028 (*info->memory_error_func) (status, address, info); 1029 return -1; 1030 } 1031 1032 /* These two functions are the main entry points, accessed from 1033 disassemble.c. */ 1034 int 1035 print_insn_big_nios2 (bfd_vma address, disassemble_info *info) 1036 { 1037 return print_insn_nios2 (address, info, BFD_ENDIAN_BIG); 1038 } 1039 1040 int 1041 print_insn_little_nios2 (bfd_vma address, disassemble_info *info) 1042 { 1043 return print_insn_nios2 (address, info, BFD_ENDIAN_LITTLE); 1044 } 1045
Indexes created Fri Mar 06 19:51:54 UTC 2026