| 1 | /* tc-moxie.c -- Assemble code for moxie |
| 2 | Copyright (C) 2009-2015 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 | /* Contributed by Anthony Green <green@moxielogic.com>. */ |
| 22 | |
| 23 | #include "as.h" |
| 24 | #include "safe-ctype.h" |
| 25 | #include "opcode/moxie.h" |
| 26 | #include "elf/moxie.h" |
| 27 | |
| 28 | extern const moxie_opc_info_t moxie_opc_info[128]; |
| 29 | |
| 30 | const char comment_chars[] = "#"; |
| 31 | const char line_separator_chars[] = ";"; |
| 32 | const char line_comment_chars[] = "#"; |
| 33 | |
| 34 | static int pending_reloc; |
| 35 | static struct hash_control *opcode_hash_control; |
| 36 | |
| 37 | const pseudo_typeS md_pseudo_table[] = |
| 38 | { |
| 39 | {0, 0, 0} |
| 40 | }; |
| 41 | |
| 42 | const char FLT_CHARS[] = "rRsSfFdDxXpP"; |
| 43 | const char EXP_CHARS[] = "eE"; |
| 44 | |
| 45 | static valueT md_chars_to_number (char * buf, int n); |
| 46 | |
| 47 | /* Byte order. */ |
| 48 | extern int target_big_endian; |
| 49 | |
| 50 | void |
| 51 | md_operand (expressionS *op __attribute__((unused))) |
| 52 | { |
| 53 | /* Empty for now. */ |
| 54 | } |
| 55 | |
| 56 | /* This function is called once, at assembler startup time. It sets |
| 57 | up the hash table with all the opcodes in it, and also initializes |
| 58 | some aliases for compatibility with other assemblers. */ |
| 59 | |
| 60 | void |
| 61 | md_begin (void) |
| 62 | { |
| 63 | int count; |
| 64 | const moxie_opc_info_t *opcode; |
| 65 | opcode_hash_control = hash_new (); |
| 66 | |
| 67 | /* Insert names into hash table. */ |
| 68 | for (count = 0, opcode = moxie_form1_opc_info; count++ < 64; opcode++) |
| 69 | hash_insert (opcode_hash_control, opcode->name, (char *) opcode); |
| 70 | |
| 71 | for (count = 0, opcode = moxie_form2_opc_info; count++ < 4; opcode++) |
| 72 | hash_insert (opcode_hash_control, opcode->name, (char *) opcode); |
| 73 | |
| 74 | for (count = 0, opcode = moxie_form3_opc_info; count++ < 10; opcode++) |
| 75 | hash_insert (opcode_hash_control, opcode->name, (char *) opcode); |
| 76 | |
| 77 | target_big_endian = TARGET_BYTES_BIG_ENDIAN; |
| 78 | |
| 79 | bfd_set_arch_mach (stdoutput, TARGET_ARCH, 0); |
| 80 | } |
| 81 | |
| 82 | /* Parse an expression and then restore the input line pointer. */ |
| 83 | |
| 84 | static char * |
| 85 | parse_exp_save_ilp (char *s, expressionS *op) |
| 86 | { |
| 87 | char *save = input_line_pointer; |
| 88 | |
| 89 | input_line_pointer = s; |
| 90 | expression (op); |
| 91 | s = input_line_pointer; |
| 92 | input_line_pointer = save; |
| 93 | return s; |
| 94 | } |
| 95 | |
| 96 | static int |
| 97 | parse_register_operand (char **ptr) |
| 98 | { |
| 99 | int reg; |
| 100 | char *s = *ptr; |
| 101 | |
| 102 | if (*s != '$') |
| 103 | { |
| 104 | as_bad (_("expecting register")); |
| 105 | ignore_rest_of_line (); |
| 106 | return -1; |
| 107 | } |
| 108 | if (s[1] == 'f' && s[2] == 'p') |
| 109 | { |
| 110 | *ptr += 3; |
| 111 | return 0; |
| 112 | } |
| 113 | if (s[1] == 's' && s[2] == 'p') |
| 114 | { |
| 115 | *ptr += 3; |
| 116 | return 1; |
| 117 | } |
| 118 | if (s[1] == 'r') |
| 119 | { |
| 120 | reg = s[2] - '0'; |
| 121 | if ((reg < 0) || (reg > 9)) |
| 122 | { |
| 123 | as_bad (_("illegal register number")); |
| 124 | ignore_rest_of_line (); |
| 125 | return -1; |
| 126 | } |
| 127 | if (reg == 1) |
| 128 | { |
| 129 | int r2 = s[3] - '0'; |
| 130 | if ((r2 >= 0) && (r2 <= 3)) |
| 131 | { |
| 132 | reg = 10 + r2; |
| 133 | *ptr += 1; |
| 134 | } |
| 135 | } |
| 136 | } |
| 137 | else |
| 138 | { |
| 139 | as_bad (_("illegal register number")); |
| 140 | ignore_rest_of_line (); |
| 141 | return -1; |
| 142 | } |
| 143 | |
| 144 | *ptr += 3; |
| 145 | |
| 146 | return reg + 2; |
| 147 | } |
| 148 | |
| 149 | /* This is the guts of the machine-dependent assembler. STR points to |
| 150 | a machine dependent instruction. This function is supposed to emit |
| 151 | the frags/bytes it assembles to. */ |
| 152 | |
| 153 | void |
| 154 | md_assemble (char *str) |
| 155 | { |
| 156 | char *op_start; |
| 157 | char *op_end; |
| 158 | |
| 159 | moxie_opc_info_t *opcode; |
| 160 | char *p; |
| 161 | char pend; |
| 162 | |
| 163 | unsigned short iword = 0; |
| 164 | |
| 165 | int nlen = 0; |
| 166 | |
| 167 | /* Drop leading whitespace. */ |
| 168 | while (*str == ' ') |
| 169 | str++; |
| 170 | |
| 171 | /* Find the op code end. */ |
| 172 | op_start = str; |
| 173 | for (op_end = str; |
| 174 | *op_end && !is_end_of_line[*op_end & 0xff] && *op_end != ' '; |
| 175 | op_end++) |
| 176 | nlen++; |
| 177 | |
| 178 | pend = *op_end; |
| 179 | *op_end = 0; |
| 180 | |
| 181 | if (nlen == 0) |
| 182 | as_bad (_("can't find opcode ")); |
| 183 | opcode = (moxie_opc_info_t *) hash_find (opcode_hash_control, op_start); |
| 184 | *op_end = pend; |
| 185 | |
| 186 | if (opcode == NULL) |
| 187 | { |
| 188 | as_bad (_("unknown opcode %s"), op_start); |
| 189 | return; |
| 190 | } |
| 191 | |
| 192 | p = frag_more (2); |
| 193 | |
| 194 | switch (opcode->itype) |
| 195 | { |
| 196 | case MOXIE_F2_A8V: |
| 197 | iword = (1<<15) | (opcode->opcode << 12); |
| 198 | while (ISSPACE (*op_end)) |
| 199 | op_end++; |
| 200 | { |
| 201 | expressionS arg; |
| 202 | int reg; |
| 203 | reg = parse_register_operand (&op_end); |
| 204 | iword += (reg << 8); |
| 205 | if (*op_end != ',') |
| 206 | as_warn (_("expecting comma delimited register operands")); |
| 207 | op_end++; |
| 208 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 209 | fix_new_exp (frag_now, |
| 210 | ((p + (target_big_endian ? 1 : 0)) - frag_now->fr_literal), |
| 211 | 1, |
| 212 | &arg, |
| 213 | 0, |
| 214 | BFD_RELOC_8); |
| 215 | } |
| 216 | break; |
| 217 | case MOXIE_F1_AB: |
| 218 | iword = opcode->opcode << 8; |
| 219 | while (ISSPACE (*op_end)) |
| 220 | op_end++; |
| 221 | { |
| 222 | int dest, src; |
| 223 | dest = parse_register_operand (&op_end); |
| 224 | if (*op_end != ',') |
| 225 | as_warn (_("expecting comma delimited register operands")); |
| 226 | op_end++; |
| 227 | src = parse_register_operand (&op_end); |
| 228 | iword += (dest << 4) + src; |
| 229 | while (ISSPACE (*op_end)) |
| 230 | op_end++; |
| 231 | if (*op_end != 0) |
| 232 | as_warn (_("extra stuff on line ignored")); |
| 233 | } |
| 234 | break; |
| 235 | case MOXIE_F1_A4: |
| 236 | iword = opcode->opcode << 8; |
| 237 | while (ISSPACE (*op_end)) |
| 238 | op_end++; |
| 239 | { |
| 240 | expressionS arg; |
| 241 | char *where; |
| 242 | int regnum; |
| 243 | |
| 244 | regnum = parse_register_operand (&op_end); |
| 245 | while (ISSPACE (*op_end)) |
| 246 | op_end++; |
| 247 | |
| 248 | iword += (regnum << 4); |
| 249 | |
| 250 | if (*op_end != ',') |
| 251 | { |
| 252 | as_bad (_("expecting comma delimited operands")); |
| 253 | ignore_rest_of_line (); |
| 254 | return; |
| 255 | } |
| 256 | op_end++; |
| 257 | |
| 258 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 259 | where = frag_more (4); |
| 260 | fix_new_exp (frag_now, |
| 261 | (where - frag_now->fr_literal), |
| 262 | 4, |
| 263 | &arg, |
| 264 | 0, |
| 265 | BFD_RELOC_32); |
| 266 | } |
| 267 | break; |
| 268 | case MOXIE_F1_M: |
| 269 | case MOXIE_F1_4: |
| 270 | iword = opcode->opcode << 8; |
| 271 | while (ISSPACE (*op_end)) |
| 272 | op_end++; |
| 273 | { |
| 274 | expressionS arg; |
| 275 | char *where; |
| 276 | |
| 277 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 278 | where = frag_more (4); |
| 279 | fix_new_exp (frag_now, |
| 280 | (where - frag_now->fr_literal), |
| 281 | 4, |
| 282 | &arg, |
| 283 | 0, |
| 284 | BFD_RELOC_32); |
| 285 | } |
| 286 | break; |
| 287 | case MOXIE_F1_NARG: |
| 288 | iword = opcode->opcode << 8; |
| 289 | while (ISSPACE (*op_end)) |
| 290 | op_end++; |
| 291 | if (*op_end != 0) |
| 292 | as_warn (_("extra stuff on line ignored")); |
| 293 | break; |
| 294 | case MOXIE_F1_A: |
| 295 | iword = opcode->opcode << 8; |
| 296 | while (ISSPACE (*op_end)) |
| 297 | op_end++; |
| 298 | { |
| 299 | int reg; |
| 300 | reg = parse_register_operand (&op_end); |
| 301 | while (ISSPACE (*op_end)) |
| 302 | op_end++; |
| 303 | if (*op_end != 0) |
| 304 | as_warn (_("extra stuff on line ignored")); |
| 305 | iword += (reg << 4); |
| 306 | } |
| 307 | break; |
| 308 | case MOXIE_F1_ABi: |
| 309 | iword = opcode->opcode << 8; |
| 310 | while (ISSPACE (*op_end)) |
| 311 | op_end++; |
| 312 | { |
| 313 | int a, b; |
| 314 | a = parse_register_operand (&op_end); |
| 315 | if (*op_end != ',') |
| 316 | as_warn (_("expecting comma delimited register operands")); |
| 317 | op_end++; |
| 318 | if (*op_end != '(') |
| 319 | { |
| 320 | as_bad (_("expecting indirect register `($rA)'")); |
| 321 | ignore_rest_of_line (); |
| 322 | return; |
| 323 | } |
| 324 | op_end++; |
| 325 | b = parse_register_operand (&op_end); |
| 326 | if (*op_end != ')') |
| 327 | { |
| 328 | as_bad (_("missing closing parenthesis")); |
| 329 | ignore_rest_of_line (); |
| 330 | return; |
| 331 | } |
| 332 | op_end++; |
| 333 | iword += (a << 4) + b; |
| 334 | while (ISSPACE (*op_end)) |
| 335 | op_end++; |
| 336 | if (*op_end != 0) |
| 337 | as_warn (_("extra stuff on line ignored")); |
| 338 | } |
| 339 | break; |
| 340 | case MOXIE_F1_AiB: |
| 341 | iword = opcode->opcode << 8; |
| 342 | while (ISSPACE (*op_end)) |
| 343 | op_end++; |
| 344 | { |
| 345 | int a, b; |
| 346 | if (*op_end != '(') |
| 347 | { |
| 348 | as_bad (_("expecting indirect register `($rA)'")); |
| 349 | ignore_rest_of_line (); |
| 350 | return; |
| 351 | } |
| 352 | op_end++; |
| 353 | a = parse_register_operand (&op_end); |
| 354 | if (*op_end != ')') |
| 355 | { |
| 356 | as_bad (_("missing closing parenthesis")); |
| 357 | ignore_rest_of_line (); |
| 358 | return; |
| 359 | } |
| 360 | op_end++; |
| 361 | if (*op_end != ',') |
| 362 | as_warn (_("expecting comma delimited register operands")); |
| 363 | op_end++; |
| 364 | b = parse_register_operand (&op_end); |
| 365 | iword += (a << 4) + b; |
| 366 | while (ISSPACE (*op_end)) |
| 367 | op_end++; |
| 368 | if (*op_end != 0) |
| 369 | as_warn (_("extra stuff on line ignored")); |
| 370 | } |
| 371 | break; |
| 372 | case MOXIE_F1_4A: |
| 373 | iword = opcode->opcode << 8; |
| 374 | while (ISSPACE (*op_end)) |
| 375 | op_end++; |
| 376 | { |
| 377 | expressionS arg; |
| 378 | char *where; |
| 379 | int a; |
| 380 | |
| 381 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 382 | where = frag_more (4); |
| 383 | fix_new_exp (frag_now, |
| 384 | (where - frag_now->fr_literal), |
| 385 | 4, |
| 386 | &arg, |
| 387 | 0, |
| 388 | BFD_RELOC_32); |
| 389 | |
| 390 | if (*op_end != ',') |
| 391 | { |
| 392 | as_bad (_("expecting comma delimited operands")); |
| 393 | ignore_rest_of_line (); |
| 394 | return; |
| 395 | } |
| 396 | op_end++; |
| 397 | |
| 398 | a = parse_register_operand (&op_end); |
| 399 | while (ISSPACE (*op_end)) |
| 400 | op_end++; |
| 401 | if (*op_end != 0) |
| 402 | as_warn (_("extra stuff on line ignored")); |
| 403 | |
| 404 | iword += (a << 4); |
| 405 | } |
| 406 | break; |
| 407 | case MOXIE_F1_ABi2: |
| 408 | iword = opcode->opcode << 8; |
| 409 | while (ISSPACE (*op_end)) |
| 410 | op_end++; |
| 411 | { |
| 412 | expressionS arg; |
| 413 | char *offset; |
| 414 | int a, b; |
| 415 | |
| 416 | a = parse_register_operand (&op_end); |
| 417 | while (ISSPACE (*op_end)) |
| 418 | op_end++; |
| 419 | |
| 420 | if (*op_end != ',') |
| 421 | { |
| 422 | as_bad (_("expecting comma delimited operands")); |
| 423 | ignore_rest_of_line (); |
| 424 | return; |
| 425 | } |
| 426 | op_end++; |
| 427 | |
| 428 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 429 | offset = frag_more (2); |
| 430 | fix_new_exp (frag_now, |
| 431 | (offset - frag_now->fr_literal), |
| 432 | 2, |
| 433 | &arg, |
| 434 | 0, |
| 435 | BFD_RELOC_16); |
| 436 | |
| 437 | if (*op_end != '(') |
| 438 | { |
| 439 | as_bad (_("expecting indirect register `($rX)'")); |
| 440 | ignore_rest_of_line (); |
| 441 | return; |
| 442 | } |
| 443 | op_end++; |
| 444 | b = parse_register_operand (&op_end); |
| 445 | if (*op_end != ')') |
| 446 | { |
| 447 | as_bad (_("missing closing parenthesis")); |
| 448 | ignore_rest_of_line (); |
| 449 | return; |
| 450 | } |
| 451 | op_end++; |
| 452 | |
| 453 | while (ISSPACE (*op_end)) |
| 454 | op_end++; |
| 455 | if (*op_end != 0) |
| 456 | as_warn (_("extra stuff on line ignored")); |
| 457 | |
| 458 | iword += (a << 4) + b; |
| 459 | } |
| 460 | break; |
| 461 | case MOXIE_F1_AiB2: |
| 462 | iword = opcode->opcode << 8; |
| 463 | while (ISSPACE (*op_end)) |
| 464 | op_end++; |
| 465 | { |
| 466 | expressionS arg; |
| 467 | char *offset; |
| 468 | int a, b; |
| 469 | |
| 470 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 471 | offset = frag_more (2); |
| 472 | fix_new_exp (frag_now, |
| 473 | (offset - frag_now->fr_literal), |
| 474 | 2, |
| 475 | &arg, |
| 476 | 0, |
| 477 | BFD_RELOC_16); |
| 478 | |
| 479 | if (*op_end != '(') |
| 480 | { |
| 481 | as_bad (_("expecting indirect register `($rX)'")); |
| 482 | ignore_rest_of_line (); |
| 483 | return; |
| 484 | } |
| 485 | op_end++; |
| 486 | a = parse_register_operand (&op_end); |
| 487 | if (*op_end != ')') |
| 488 | { |
| 489 | as_bad (_("missing closing parenthesis")); |
| 490 | ignore_rest_of_line (); |
| 491 | return; |
| 492 | } |
| 493 | op_end++; |
| 494 | |
| 495 | if (*op_end != ',') |
| 496 | { |
| 497 | as_bad (_("expecting comma delimited operands")); |
| 498 | ignore_rest_of_line (); |
| 499 | return; |
| 500 | } |
| 501 | op_end++; |
| 502 | |
| 503 | b = parse_register_operand (&op_end); |
| 504 | while (ISSPACE (*op_end)) |
| 505 | op_end++; |
| 506 | |
| 507 | while (ISSPACE (*op_end)) |
| 508 | op_end++; |
| 509 | if (*op_end != 0) |
| 510 | as_warn (_("extra stuff on line ignored")); |
| 511 | |
| 512 | iword += (a << 4) + b; |
| 513 | } |
| 514 | break; |
| 515 | case MOXIE_F2_NARG: |
| 516 | iword = opcode->opcode << 12; |
| 517 | while (ISSPACE (*op_end)) |
| 518 | op_end++; |
| 519 | if (*op_end != 0) |
| 520 | as_warn (_("extra stuff on line ignored")); |
| 521 | break; |
| 522 | case MOXIE_F3_PCREL: |
| 523 | iword = (3<<14) | (opcode->opcode << 10); |
| 524 | while (ISSPACE (*op_end)) |
| 525 | op_end++; |
| 526 | { |
| 527 | expressionS arg; |
| 528 | |
| 529 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 530 | fix_new_exp (frag_now, |
| 531 | (p - frag_now->fr_literal), |
| 532 | 2, |
| 533 | &arg, |
| 534 | TRUE, |
| 535 | BFD_RELOC_MOXIE_10_PCREL); |
| 536 | } |
| 537 | break; |
| 538 | default: |
| 539 | abort (); |
| 540 | } |
| 541 | |
| 542 | md_number_to_chars (p, iword, 2); |
| 543 | |
| 544 | while (ISSPACE (*op_end)) |
| 545 | op_end++; |
| 546 | |
| 547 | if (*op_end != 0) |
| 548 | as_warn (_("extra stuff on line ignored")); |
| 549 | |
| 550 | if (pending_reloc) |
| 551 | as_bad (_("Something forgot to clean up\n")); |
| 552 | } |
| 553 | |
| 554 | /* Turn a string in input_line_pointer into a floating point constant |
| 555 | of type type, and store the appropriate bytes in *LITP. The number |
| 556 | of LITTLENUMS emitted is stored in *SIZEP . An error message is |
| 557 | returned, or NULL on OK. */ |
| 558 | |
| 559 | char * |
| 560 | md_atof (int type, char *litP, int *sizeP) |
| 561 | { |
| 562 | int prec; |
| 563 | LITTLENUM_TYPE words[4]; |
| 564 | char *t; |
| 565 | int i; |
| 566 | |
| 567 | switch (type) |
| 568 | { |
| 569 | case 'f': |
| 570 | prec = 2; |
| 571 | break; |
| 572 | |
| 573 | case 'd': |
| 574 | prec = 4; |
| 575 | break; |
| 576 | |
| 577 | default: |
| 578 | *sizeP = 0; |
| 579 | return _("bad call to md_atof"); |
| 580 | } |
| 581 | |
| 582 | t = atof_ieee (input_line_pointer, type, words); |
| 583 | if (t) |
| 584 | input_line_pointer = t; |
| 585 | |
| 586 | *sizeP = prec * 2; |
| 587 | |
| 588 | for (i = prec - 1; i >= 0; i--) |
| 589 | { |
| 590 | md_number_to_chars (litP, (valueT) words[i], 2); |
| 591 | litP += 2; |
| 592 | } |
| 593 | |
| 594 | return NULL; |
| 595 | } |
| 596 | |
| 597 | enum options |
| 598 | { |
| 599 | OPTION_EB = OPTION_MD_BASE, |
| 600 | OPTION_EL, |
| 601 | }; |
| 602 | |
| 603 | struct option md_longopts[] = |
| 604 | { |
| 605 | { "EB", no_argument, NULL, OPTION_EB}, |
| 606 | { "EL", no_argument, NULL, OPTION_EL}, |
| 607 | { NULL, no_argument, NULL, 0} |
| 608 | }; |
| 609 | |
| 610 | size_t md_longopts_size = sizeof (md_longopts); |
| 611 | \f |
| 612 | const char *md_shortopts = ""; |
| 613 | |
| 614 | int |
| 615 | md_parse_option (int c ATTRIBUTE_UNUSED, char *arg ATTRIBUTE_UNUSED) |
| 616 | { |
| 617 | switch (c) |
| 618 | { |
| 619 | case OPTION_EB: |
| 620 | target_big_endian = 1; |
| 621 | break; |
| 622 | case OPTION_EL: |
| 623 | target_big_endian = 0; |
| 624 | break; |
| 625 | default: |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | return 1; |
| 630 | } |
| 631 | |
| 632 | void |
| 633 | md_show_usage (FILE *stream ATTRIBUTE_UNUSED) |
| 634 | { |
| 635 | fprintf (stream, _("\ |
| 636 | -EB assemble for a big endian system (default)\n\ |
| 637 | -EL assemble for a little endian system\n")); |
| 638 | } |
| 639 | |
| 640 | /* Apply a fixup to the object file. */ |
| 641 | |
| 642 | void |
| 643 | md_apply_fix (fixS *fixP ATTRIBUTE_UNUSED, |
| 644 | valueT * valP ATTRIBUTE_UNUSED, segT seg ATTRIBUTE_UNUSED) |
| 645 | { |
| 646 | char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; |
| 647 | long val = *valP; |
| 648 | long newval; |
| 649 | long max, min; |
| 650 | |
| 651 | max = min = 0; |
| 652 | switch (fixP->fx_r_type) |
| 653 | { |
| 654 | case BFD_RELOC_32: |
| 655 | if (target_big_endian) |
| 656 | { |
| 657 | buf[0] = val >> 24; |
| 658 | buf[1] = val >> 16; |
| 659 | buf[2] = val >> 8; |
| 660 | buf[3] = val >> 0; |
| 661 | } |
| 662 | else |
| 663 | { |
| 664 | buf[3] = val >> 24; |
| 665 | buf[2] = val >> 16; |
| 666 | buf[1] = val >> 8; |
| 667 | buf[0] = val >> 0; |
| 668 | } |
| 669 | buf += 4; |
| 670 | break; |
| 671 | |
| 672 | case BFD_RELOC_16: |
| 673 | if (target_big_endian) |
| 674 | { |
| 675 | buf[0] = val >> 8; |
| 676 | buf[1] = val >> 0; |
| 677 | } |
| 678 | else |
| 679 | { |
| 680 | buf[1] = val >> 8; |
| 681 | buf[0] = val >> 0; |
| 682 | } |
| 683 | buf += 2; |
| 684 | break; |
| 685 | |
| 686 | case BFD_RELOC_8: |
| 687 | *buf++ = val; |
| 688 | break; |
| 689 | |
| 690 | case BFD_RELOC_MOXIE_10_PCREL: |
| 691 | if (!val) |
| 692 | break; |
| 693 | if (val < -1024 || val > 1022) |
| 694 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 695 | _("pcrel too far BFD_RELOC_MOXIE_10")); |
| 696 | /* 11 bit offset even numbered, so we remove right bit. */ |
| 697 | val >>= 1; |
| 698 | newval = md_chars_to_number (buf, 2); |
| 699 | newval |= val & 0x03ff; |
| 700 | md_number_to_chars (buf, newval, 2); |
| 701 | break; |
| 702 | |
| 703 | default: |
| 704 | abort (); |
| 705 | } |
| 706 | |
| 707 | if (max != 0 && (val < min || val > max)) |
| 708 | as_bad_where (fixP->fx_file, fixP->fx_line, _("offset out of range")); |
| 709 | |
| 710 | if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0) |
| 711 | fixP->fx_done = 1; |
| 712 | } |
| 713 | |
| 714 | /* Put number into target byte order. */ |
| 715 | |
| 716 | void |
| 717 | md_number_to_chars (char * ptr, valueT use, int nbytes) |
| 718 | { |
| 719 | if (target_big_endian) |
| 720 | number_to_chars_bigendian (ptr, use, nbytes); |
| 721 | else |
| 722 | number_to_chars_littleendian (ptr, use, nbytes); |
| 723 | } |
| 724 | |
| 725 | /* Convert from target byte order to host byte order. */ |
| 726 | |
| 727 | static valueT |
| 728 | md_chars_to_number (char * buf, int n) |
| 729 | { |
| 730 | valueT result = 0; |
| 731 | unsigned char * where = (unsigned char *) buf; |
| 732 | |
| 733 | if (target_big_endian) |
| 734 | { |
| 735 | while (n--) |
| 736 | { |
| 737 | result <<= 8; |
| 738 | result |= (*where++ & 255); |
| 739 | } |
| 740 | } |
| 741 | else |
| 742 | { |
| 743 | while (n--) |
| 744 | { |
| 745 | result <<= 8; |
| 746 | result |= (where[n] & 255); |
| 747 | } |
| 748 | } |
| 749 | |
| 750 | return result; |
| 751 | } |
| 752 | |
| 753 | /* Generate a machine-dependent relocation. */ |
| 754 | arelent * |
| 755 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixP) |
| 756 | { |
| 757 | arelent *relP; |
| 758 | bfd_reloc_code_real_type code; |
| 759 | |
| 760 | switch (fixP->fx_r_type) |
| 761 | { |
| 762 | case BFD_RELOC_32: |
| 763 | code = fixP->fx_r_type; |
| 764 | break; |
| 765 | case BFD_RELOC_MOXIE_10_PCREL: |
| 766 | code = fixP->fx_r_type; |
| 767 | break; |
| 768 | default: |
| 769 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 770 | _("Semantics error. This type of operand can not be relocated, it must be an assembly-time constant")); |
| 771 | return 0; |
| 772 | } |
| 773 | |
| 774 | relP = xmalloc (sizeof (arelent)); |
| 775 | gas_assert (relP != 0); |
| 776 | relP->sym_ptr_ptr = xmalloc (sizeof (asymbol *)); |
| 777 | *relP->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); |
| 778 | relP->address = fixP->fx_frag->fr_address + fixP->fx_where; |
| 779 | |
| 780 | relP->addend = fixP->fx_offset; |
| 781 | |
| 782 | /* This is the standard place for KLUDGEs to work around bugs in |
| 783 | bfd_install_relocation (first such note in the documentation |
| 784 | appears with binutils-2.8). |
| 785 | |
| 786 | That function bfd_install_relocation does the wrong thing with |
| 787 | putting stuff into the addend of a reloc (it should stay out) for a |
| 788 | weak symbol. The really bad thing is that it adds the |
| 789 | "segment-relative offset" of the symbol into the reloc. In this |
| 790 | case, the reloc should instead be relative to the symbol with no |
| 791 | other offset than the assembly code shows; and since the symbol is |
| 792 | weak, any local definition should be ignored until link time (or |
| 793 | thereafter). |
| 794 | To wit: weaksym+42 should be weaksym+42 in the reloc, |
| 795 | not weaksym+(offset_from_segment_of_local_weaksym_definition) |
| 796 | |
| 797 | To "work around" this, we subtract the segment-relative offset of |
| 798 | "known" weak symbols. This evens out the extra offset. |
| 799 | |
| 800 | That happens for a.out but not for ELF, since for ELF, |
| 801 | bfd_install_relocation uses the "special function" field of the |
| 802 | howto, and does not execute the code that needs to be undone. */ |
| 803 | |
| 804 | if (OUTPUT_FLAVOR == bfd_target_aout_flavour |
| 805 | && fixP->fx_addsy && S_IS_WEAK (fixP->fx_addsy) |
| 806 | && ! bfd_is_und_section (S_GET_SEGMENT (fixP->fx_addsy))) |
| 807 | { |
| 808 | relP->addend -= S_GET_VALUE (fixP->fx_addsy); |
| 809 | } |
| 810 | |
| 811 | relP->howto = bfd_reloc_type_lookup (stdoutput, code); |
| 812 | if (! relP->howto) |
| 813 | { |
| 814 | const char *name; |
| 815 | |
| 816 | name = S_GET_NAME (fixP->fx_addsy); |
| 817 | if (name == NULL) |
| 818 | name = _("<unknown>"); |
| 819 | as_fatal (_("Cannot generate relocation type for symbol %s, code %s"), |
| 820 | name, bfd_get_reloc_code_name (code)); |
| 821 | } |
| 822 | |
| 823 | return relP; |
| 824 | } |
| 825 | |
| 826 | /* Decide from what point a pc-relative relocation is relative to, |
| 827 | relative to the pc-relative fixup. Er, relatively speaking. */ |
| 828 | long |
| 829 | md_pcrel_from (fixS *fixP) |
| 830 | { |
| 831 | valueT addr = fixP->fx_where + fixP->fx_frag->fr_address; |
| 832 | |
| 833 | switch (fixP->fx_r_type) |
| 834 | { |
| 835 | case BFD_RELOC_32: |
| 836 | return addr + 4; |
| 837 | case BFD_RELOC_MOXIE_10_PCREL: |
| 838 | /* Offset is from the end of the instruction. */ |
| 839 | return addr + 2; |
| 840 | default: |
| 841 | abort (); |
| 842 | return addr; |
| 843 | } |
| 844 | } |