| 1 | /* mmix-dis.c -- Disassemble MMIX instructions. |
| 2 | Copyright (C) 2000, 2001 Free Software Foundation, Inc. |
| 3 | Written by Hans-Peter Nilsson (hp@bitrange.com) |
| 4 | |
| 5 | This file is part of GDB and the GNU binutils. |
| 6 | |
| 7 | GDB and the GNU binutils are free software; you can redistribute |
| 8 | them and/or modify them under the terms of the GNU General Public |
| 9 | License as published by the Free Software Foundation; either version 2, |
| 10 | or (at your option) any later version. |
| 11 | |
| 12 | GDB and the GNU binutils are distributed in the hope that they |
| 13 | will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 14 | warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 15 | the GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this file; see the file COPYING. If not, write to the Free |
| 19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include <stdio.h> |
| 22 | #include <string.h> |
| 23 | #include <stdlib.h> |
| 24 | #include "opcode/mmix.h" |
| 25 | #include "dis-asm.h" |
| 26 | #include "libiberty.h" |
| 27 | #include "bfd.h" |
| 28 | #include "opintl.h" |
| 29 | |
| 30 | #define BAD_CASE(x) \ |
| 31 | do \ |
| 32 | { \ |
| 33 | fprintf (stderr, \ |
| 34 | _("Bad case %d (%s) in %s:%d\n"), \ |
| 35 | x, #x, __FILE__, __LINE__); \ |
| 36 | abort (); \ |
| 37 | } \ |
| 38 | while (0) |
| 39 | |
| 40 | #define FATAL_DEBUG \ |
| 41 | do \ |
| 42 | { \ |
| 43 | fprintf (stderr, \ |
| 44 | _("Internal: Non-debugged code (test-case missing): %s:%d"), \ |
| 45 | __FILE__, __LINE__); \ |
| 46 | abort (); \ |
| 47 | } \ |
| 48 | while (0) |
| 49 | |
| 50 | #define ROUND_MODE(n) \ |
| 51 | ((n) == 1 ? "ROUND_OFF" : (n) == 2 ? "ROUND_UP" : \ |
| 52 | (n) == 3 ? "ROUND_DOWN" : (n) == 4 ? "ROUND_NEAR" : \ |
| 53 | _("(unknown)")) |
| 54 | |
| 55 | #define INSN_IMMEDIATE_BIT (IMM_OFFSET_BIT << 24) |
| 56 | #define INSN_BACKWARD_OFFSET_BIT (1 << 24) |
| 57 | |
| 58 | struct mmix_dis_info |
| 59 | { |
| 60 | const char *reg_name[256]; |
| 61 | const char *spec_reg_name[32]; |
| 62 | |
| 63 | /* Waste a little memory so we don't have to allocate each separately. |
| 64 | We could have an array with static contents for these, but on the |
| 65 | other hand, we don't have to. */ |
| 66 | char basic_reg_name[256][sizeof ("$255")]; |
| 67 | }; |
| 68 | |
| 69 | static boolean initialize_mmix_dis_info PARAMS ((struct disassemble_info *)); |
| 70 | static const struct mmix_opcode *get_opcode PARAMS ((unsigned long)); |
| 71 | |
| 72 | |
| 73 | /* Initialize a target-specific array in INFO. */ |
| 74 | |
| 75 | static boolean |
| 76 | initialize_mmix_dis_info (info) |
| 77 | struct disassemble_info *info; |
| 78 | { |
| 79 | struct mmix_dis_info *minfop = malloc (sizeof (struct mmix_dis_info)); |
| 80 | int i; |
| 81 | |
| 82 | if (minfop == NULL) |
| 83 | return false; |
| 84 | |
| 85 | memset (minfop, 0, sizeof (*minfop)); |
| 86 | |
| 87 | /* Initialize register names from register symbols. If there's no |
| 88 | register section, then there are no register symbols. */ |
| 89 | if ((info->section != NULL && info->section->owner != NULL) |
| 90 | || (info->symbols != NULL |
| 91 | && info->symbols[0] != NULL |
| 92 | && bfd_asymbol_bfd (info->symbols[0]) != NULL)) |
| 93 | { |
| 94 | bfd *abfd = info->section && info->section->owner != NULL |
| 95 | ? info->section->owner |
| 96 | : bfd_asymbol_bfd (info->symbols[0]); |
| 97 | asection *reg_section = bfd_get_section_by_name (abfd, "*REG*"); |
| 98 | |
| 99 | if (reg_section != NULL) |
| 100 | { |
| 101 | /* The returned symcount *does* include the ending NULL. */ |
| 102 | long symsize = bfd_get_symtab_upper_bound (abfd); |
| 103 | asymbol **syms = malloc (symsize); |
| 104 | long nsyms; |
| 105 | long i; |
| 106 | |
| 107 | if (syms == NULL) |
| 108 | { FATAL_DEBUG; |
| 109 | free (minfop); |
| 110 | return false; |
| 111 | } |
| 112 | nsyms = bfd_canonicalize_symtab (abfd, syms); |
| 113 | |
| 114 | /* We use the first name for a register. If this is MMO, then |
| 115 | it's the name with the first sequence number, presumably the |
| 116 | first in the source. */ |
| 117 | for (i = 0; i < nsyms && syms[i] != NULL; i++) |
| 118 | { |
| 119 | if (syms[i]->section == reg_section |
| 120 | && syms[i]->value < 256 |
| 121 | && minfop->reg_name[syms[i]->value] == NULL) |
| 122 | minfop->reg_name[syms[i]->value] = syms[i]->name; |
| 123 | } |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /* Fill in the rest with the canonical names. */ |
| 128 | for (i = 0; i < 256; i++) |
| 129 | if (minfop->reg_name[i] == NULL) |
| 130 | { |
| 131 | sprintf (minfop->basic_reg_name[i], "$%d", i); |
| 132 | minfop->reg_name[i] = minfop->basic_reg_name[i]; |
| 133 | } |
| 134 | |
| 135 | /* We assume it's actually a one-to-one mapping of number-to-name. */ |
| 136 | for (i = 0; mmix_spec_regs[i].name != NULL; i++) |
| 137 | minfop->spec_reg_name[mmix_spec_regs[i].number] = mmix_spec_regs[i].name; |
| 138 | |
| 139 | info->private_data = (PTR) minfop; |
| 140 | return true; |
| 141 | } |
| 142 | |
| 143 | /* A table indexed by the first byte is constructed as we disassemble each |
| 144 | tetrabyte. The contents is a pointer into mmix_insns reflecting the |
| 145 | first found entry with matching match-bits and lose-bits. Further |
| 146 | entries are considered one after one until the operand constraints |
| 147 | match or the match-bits and lose-bits do not match. Normally a |
| 148 | "further entry" will just show that there was no other match. */ |
| 149 | |
| 150 | static const struct mmix_opcode * |
| 151 | get_opcode (insn) |
| 152 | unsigned long insn; |
| 153 | { |
| 154 | static const struct mmix_opcode **opcodes = NULL; |
| 155 | const struct mmix_opcode *opcodep = mmix_opcodes; |
| 156 | unsigned int opcode_part = (insn >> 24) & 255; |
| 157 | if (opcodes == NULL) |
| 158 | opcodes = xcalloc (256, sizeof (struct mmix_opcode *)); |
| 159 | |
| 160 | opcodep = opcodes[opcode_part]; |
| 161 | if (opcodep == NULL |
| 162 | || (opcodep->match & insn) != opcodep->match |
| 163 | || (opcodep->lose & insn) != 0) |
| 164 | { |
| 165 | /* Search through the table. */ |
| 166 | for (opcodep = mmix_opcodes; opcodep->name != NULL; opcodep++) |
| 167 | { |
| 168 | /* FIXME: Break out this into an initialization function. */ |
| 169 | if ((opcodep->match & (opcode_part << 24)) == opcode_part |
| 170 | && (opcodep->lose & (opcode_part << 24)) == 0) |
| 171 | opcodes[opcode_part] = opcodep; |
| 172 | |
| 173 | if ((opcodep->match & insn) == opcodep->match |
| 174 | && (opcodep->lose & insn) == 0) |
| 175 | break; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | if (opcodep->name == NULL) |
| 180 | return NULL; |
| 181 | |
| 182 | /* Check constraints. If they don't match, loop through the next opcode |
| 183 | entries. */ |
| 184 | do |
| 185 | { |
| 186 | switch (opcodep->operands) |
| 187 | { |
| 188 | /* These have no restraint on what can be in the lower three |
| 189 | bytes. */ |
| 190 | case mmix_operands_regs: |
| 191 | case mmix_operands_reg_yz: |
| 192 | case mmix_operands_regs_z_opt: |
| 193 | case mmix_operands_regs_z: |
| 194 | case mmix_operands_jmp: |
| 195 | case mmix_operands_pushgo: |
| 196 | case mmix_operands_pop: |
| 197 | case mmix_operands_sync: |
| 198 | case mmix_operands_x_regs_z: |
| 199 | case mmix_operands_neg: |
| 200 | case mmix_operands_pushj: |
| 201 | case mmix_operands_regaddr: |
| 202 | case mmix_operands_get: |
| 203 | case mmix_operands_set: |
| 204 | case mmix_operands_save: |
| 205 | case mmix_operands_unsave: |
| 206 | case mmix_operands_xyz_opt: |
| 207 | return opcodep; |
| 208 | |
| 209 | /* For a ROUND_MODE, the middle byte must be 0..4. */ |
| 210 | case mmix_operands_roundregs_z: |
| 211 | case mmix_operands_roundregs: |
| 212 | { |
| 213 | int midbyte = (insn >> 8) & 255; |
| 214 | if (midbyte <= 4) |
| 215 | return opcodep; |
| 216 | } |
| 217 | break; |
| 218 | |
| 219 | case mmix_operands_put: |
| 220 | /* A "PUT". If it is "immediate", then no restrictions, |
| 221 | otherwise we have to make sure the register number is < 32. */ |
| 222 | if ((insn & INSN_IMMEDIATE_BIT) |
| 223 | || ((insn >> 16) & 255) < 32) |
| 224 | return opcodep; |
| 225 | break; |
| 226 | |
| 227 | case mmix_operands_resume: |
| 228 | /* Middle bytes must be zero. */ |
| 229 | if ((insn & 0x00ffff00) == 0) |
| 230 | return opcodep; |
| 231 | break; |
| 232 | |
| 233 | default: |
| 234 | BAD_CASE (opcodep->operands); |
| 235 | } |
| 236 | |
| 237 | opcodep++; |
| 238 | } |
| 239 | while ((opcodep->match & insn) == opcodep->match |
| 240 | && (opcodep->lose & insn) == 0); |
| 241 | |
| 242 | /* If we got here, we had no match. */ |
| 243 | return NULL; |
| 244 | } |
| 245 | |
| 246 | /* The main disassembly function. */ |
| 247 | |
| 248 | int |
| 249 | print_insn_mmix (memaddr, info) |
| 250 | bfd_vma memaddr; |
| 251 | struct disassemble_info *info; |
| 252 | { |
| 253 | unsigned char buffer[4]; |
| 254 | unsigned long insn; |
| 255 | unsigned int x, y, z; |
| 256 | const struct mmix_opcode *opcodep; |
| 257 | int status = (*info->read_memory_func) (memaddr, buffer, 4, info); |
| 258 | struct mmix_dis_info *minfop; |
| 259 | |
| 260 | if (status != 0) |
| 261 | { |
| 262 | (*info->memory_error_func) (status, memaddr, info); |
| 263 | return -1; |
| 264 | } |
| 265 | |
| 266 | /* FIXME: Is -1 suitable? */ |
| 267 | if (info->private_data == NULL |
| 268 | && ! initialize_mmix_dis_info (info)) |
| 269 | return -1; |
| 270 | |
| 271 | minfop = (struct mmix_dis_info *) info->private_data; |
| 272 | x = buffer[1]; |
| 273 | y = buffer[2]; |
| 274 | z = buffer[3]; |
| 275 | |
| 276 | insn = bfd_getb32 (buffer); |
| 277 | |
| 278 | opcodep = get_opcode (insn); |
| 279 | |
| 280 | if (opcodep == NULL) |
| 281 | { |
| 282 | (*info->fprintf_func) (info->stream, _("*unknown*")); |
| 283 | return 4; |
| 284 | } |
| 285 | |
| 286 | (*info->fprintf_func) (info->stream, "%s ", opcodep->name); |
| 287 | |
| 288 | /* Present bytes in the order they are laid out in memory. */ |
| 289 | info->display_endian = BFD_ENDIAN_BIG; |
| 290 | |
| 291 | info->insn_info_valid = 1; |
| 292 | info->bytes_per_chunk = 4; |
| 293 | info->branch_delay_insns = 0; |
| 294 | info->target = 0; |
| 295 | switch (opcodep->type) |
| 296 | { |
| 297 | case mmix_type_normal: |
| 298 | case mmix_type_memaccess_block: |
| 299 | info->insn_type = dis_nonbranch; |
| 300 | break; |
| 301 | |
| 302 | case mmix_type_branch: |
| 303 | info->insn_type = dis_branch; |
| 304 | break; |
| 305 | |
| 306 | case mmix_type_condbranch: |
| 307 | info->insn_type = dis_condbranch; |
| 308 | break; |
| 309 | |
| 310 | case mmix_type_memaccess_octa: |
| 311 | info->insn_type = dis_dref; |
| 312 | info->data_size = 8; |
| 313 | break; |
| 314 | |
| 315 | case mmix_type_memaccess_tetra: |
| 316 | info->insn_type = dis_dref; |
| 317 | info->data_size = 4; |
| 318 | break; |
| 319 | |
| 320 | case mmix_type_memaccess_wyde: |
| 321 | info->insn_type = dis_dref; |
| 322 | info->data_size = 2; |
| 323 | break; |
| 324 | |
| 325 | case mmix_type_memaccess_byte: |
| 326 | info->insn_type = dis_dref; |
| 327 | info->data_size = 1; |
| 328 | break; |
| 329 | |
| 330 | case mmix_type_jsr: |
| 331 | info->insn_type = dis_jsr; |
| 332 | break; |
| 333 | |
| 334 | default: |
| 335 | BAD_CASE(opcodep->type); |
| 336 | } |
| 337 | |
| 338 | switch (opcodep->operands) |
| 339 | { |
| 340 | case mmix_operands_regs: |
| 341 | /* All registers: "$X,$Y,$Z". */ |
| 342 | (*info->fprintf_func) (info->stream, "%s,%s,%s", |
| 343 | minfop->reg_name[x], |
| 344 | minfop->reg_name[y], |
| 345 | minfop->reg_name[z]); |
| 346 | break; |
| 347 | |
| 348 | case mmix_operands_reg_yz: |
| 349 | /* Like SETH - "$X,YZ". */ |
| 350 | (*info->fprintf_func) (info->stream, "%s,0x%x", |
| 351 | minfop->reg_name[x], y * 256 + z); |
| 352 | break; |
| 353 | |
| 354 | case mmix_operands_regs_z_opt: |
| 355 | case mmix_operands_regs_z: |
| 356 | case mmix_operands_pushgo: |
| 357 | /* The regular "$X,$Y,$Z|Z". */ |
| 358 | if (insn & INSN_IMMEDIATE_BIT) |
| 359 | (*info->fprintf_func) (info->stream, "%s,%s,%d", |
| 360 | minfop->reg_name[x], minfop->reg_name[y], z); |
| 361 | else |
| 362 | (*info->fprintf_func) (info->stream, "%s,%s,%s", |
| 363 | minfop->reg_name[x], |
| 364 | minfop->reg_name[y], |
| 365 | minfop->reg_name[z]); |
| 366 | break; |
| 367 | |
| 368 | case mmix_operands_jmp: |
| 369 | /* Address; only JMP. */ |
| 370 | { |
| 371 | bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4; |
| 372 | |
| 373 | if (insn & INSN_BACKWARD_OFFSET_BIT) |
| 374 | offset -= (256 * 65536) * 4; |
| 375 | |
| 376 | info->target = memaddr + offset; |
| 377 | (*info->print_address_func) (memaddr + offset, info); |
| 378 | } |
| 379 | break; |
| 380 | |
| 381 | case mmix_operands_roundregs_z: |
| 382 | /* Two registers, like FLOT, possibly with rounding: "$X,$Z|Z" |
| 383 | "$X,ROUND_MODE,$Z|Z". */ |
| 384 | if (y != 0) |
| 385 | { |
| 386 | if (insn & INSN_IMMEDIATE_BIT) |
| 387 | (*info->fprintf_func) (info->stream, "%s,%s,%d", |
| 388 | minfop->reg_name[x], |
| 389 | ROUND_MODE (y), z); |
| 390 | else |
| 391 | (*info->fprintf_func) (info->stream, "%s,%s,%s", |
| 392 | minfop->reg_name[x], |
| 393 | ROUND_MODE (y), |
| 394 | minfop->reg_name[z]); |
| 395 | } |
| 396 | else |
| 397 | { |
| 398 | if (insn & INSN_IMMEDIATE_BIT) |
| 399 | (*info->fprintf_func) (info->stream, "%s,%d", |
| 400 | minfop->reg_name[x], z); |
| 401 | else |
| 402 | (*info->fprintf_func) (info->stream, "%s,%s", |
| 403 | minfop->reg_name[x], |
| 404 | minfop->reg_name[z]); |
| 405 | } |
| 406 | break; |
| 407 | |
| 408 | case mmix_operands_pop: |
| 409 | /* Like POP - "X,YZ". */ |
| 410 | (*info->fprintf_func) (info->stream, "%d,%d", x, y*256 + z); |
| 411 | break; |
| 412 | |
| 413 | case mmix_operands_roundregs: |
| 414 | /* Two registers, possibly with rounding: "$X,$Z" or |
| 415 | "$X,ROUND_MODE,$Z". */ |
| 416 | if (y != 0) |
| 417 | (*info->fprintf_func) (info->stream, "%s,%s,%s", |
| 418 | minfop->reg_name[x], |
| 419 | ROUND_MODE (y), |
| 420 | minfop->reg_name[z]); |
| 421 | else |
| 422 | (*info->fprintf_func) (info->stream, "%s,%s", |
| 423 | minfop->reg_name[x], |
| 424 | minfop->reg_name[z]); |
| 425 | break; |
| 426 | |
| 427 | case mmix_operands_sync: |
| 428 | /* Like SYNC - "XYZ". */ |
| 429 | (*info->fprintf_func) (info->stream, "%u", |
| 430 | x * 65536 + y * 256 + z); |
| 431 | break; |
| 432 | |
| 433 | case mmix_operands_x_regs_z: |
| 434 | /* Like SYNCD - "X,$Y,$Z|Z". */ |
| 435 | if (insn & INSN_IMMEDIATE_BIT) |
| 436 | (*info->fprintf_func) (info->stream, "%d,%s,%d", |
| 437 | x, minfop->reg_name[y], z); |
| 438 | else |
| 439 | (*info->fprintf_func) (info->stream, "%d,%s,%s", |
| 440 | x, minfop->reg_name[y], |
| 441 | minfop->reg_name[z]); |
| 442 | break; |
| 443 | |
| 444 | case mmix_operands_neg: |
| 445 | /* Like NEG and NEGU - "$X,Y,$Z|Z". */ |
| 446 | if (insn & INSN_IMMEDIATE_BIT) |
| 447 | (*info->fprintf_func) (info->stream, "%s,%d,%d", |
| 448 | minfop->reg_name[x], y, z); |
| 449 | else |
| 450 | (*info->fprintf_func) (info->stream, "%s,%d,%s", |
| 451 | minfop->reg_name[x], y, |
| 452 | minfop->reg_name[z]); |
| 453 | break; |
| 454 | |
| 455 | case mmix_operands_pushj: |
| 456 | case mmix_operands_regaddr: |
| 457 | /* Like GETA or branches - "$X,Address". */ |
| 458 | { |
| 459 | bfd_signed_vma offset = (y * 256 + z) * 4; |
| 460 | |
| 461 | if (insn & INSN_BACKWARD_OFFSET_BIT) |
| 462 | offset -= 65536 * 4; |
| 463 | |
| 464 | info->target = memaddr + offset; |
| 465 | |
| 466 | (*info->fprintf_func) (info->stream, "%s,", minfop->reg_name[x]); |
| 467 | (*info->print_address_func) (memaddr + offset, info); |
| 468 | } |
| 469 | break; |
| 470 | |
| 471 | case mmix_operands_get: |
| 472 | /* GET - "X,spec_reg". */ |
| 473 | (*info->fprintf_func) (info->stream, "%s,%s", |
| 474 | minfop->reg_name[x], |
| 475 | minfop->spec_reg_name[z]); |
| 476 | break; |
| 477 | |
| 478 | case mmix_operands_put: |
| 479 | /* PUT - "spec_reg,$Z|Z". */ |
| 480 | if (insn & INSN_IMMEDIATE_BIT) |
| 481 | (*info->fprintf_func) (info->stream, "%s,%d", |
| 482 | minfop->spec_reg_name[x], z); |
| 483 | else |
| 484 | (*info->fprintf_func) (info->stream, "%s,%s", |
| 485 | minfop->spec_reg_name[x], |
| 486 | minfop->reg_name[z]); |
| 487 | break; |
| 488 | |
| 489 | case mmix_operands_set: |
| 490 | /* Two registers, "$X,$Y". */ |
| 491 | (*info->fprintf_func) (info->stream, "%s,%s", |
| 492 | minfop->reg_name[x], |
| 493 | minfop->reg_name[y]); |
| 494 | break; |
| 495 | |
| 496 | case mmix_operands_save: |
| 497 | /* SAVE - "$X,0". */ |
| 498 | (*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]); |
| 499 | break; |
| 500 | |
| 501 | case mmix_operands_unsave: |
| 502 | /* UNSAVE - "0,$Z". */ |
| 503 | (*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]); |
| 504 | break; |
| 505 | |
| 506 | case mmix_operands_xyz_opt: |
| 507 | /* Like SWYM or TRAP - "X,Y,Z". */ |
| 508 | (*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z); |
| 509 | break; |
| 510 | |
| 511 | case mmix_operands_resume: |
| 512 | /* Just "Z", like RESUME. */ |
| 513 | (*info->fprintf_func) (info->stream, "%d", z); |
| 514 | break; |
| 515 | |
| 516 | default: |
| 517 | (*info->fprintf_func) (info->stream, _("*unknown operands type: %d*"), |
| 518 | opcodep->operands); |
| 519 | break; |
| 520 | } |
| 521 | |
| 522 | return 4; |
| 523 | } |