| 1 | /* tc-moxie.c -- Assemble code for moxie |
| 2 | Copyright 2009 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GAS, the GNU Assembler. |
| 6 | |
| 7 | GAS is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GAS is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GAS; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, 51 Franklin Street - Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | /* Contributed by Anthony Green <green@moxielogic.com>. */ |
| 23 | |
| 24 | #include "as.h" |
| 25 | #include "safe-ctype.h" |
| 26 | #include "opcode/moxie.h" |
| 27 | #include "elf/moxie.h" |
| 28 | |
| 29 | extern const moxie_opc_info_t moxie_opc_info[128]; |
| 30 | |
| 31 | const char comment_chars[] = "#"; |
| 32 | const char line_separator_chars[] = ";"; |
| 33 | const char line_comment_chars[] = "#"; |
| 34 | |
| 35 | static int pending_reloc; |
| 36 | static struct hash_control *opcode_hash_control; |
| 37 | |
| 38 | const pseudo_typeS md_pseudo_table[] = |
| 39 | { |
| 40 | {0, 0, 0} |
| 41 | }; |
| 42 | |
| 43 | const char FLT_CHARS[] = "rRsSfFdDxXpP"; |
| 44 | const char EXP_CHARS[] = "eE"; |
| 45 | |
| 46 | void |
| 47 | md_operand (expressionS *op __attribute__((unused))) |
| 48 | { |
| 49 | /* Empty for now. */ |
| 50 | } |
| 51 | |
| 52 | /* This function is called once, at assembler startup time. It sets |
| 53 | up the hash table with all the opcodes in it, and also initializes |
| 54 | some aliases for compatibility with other assemblers. */ |
| 55 | |
| 56 | void |
| 57 | md_begin (void) |
| 58 | { |
| 59 | int count; |
| 60 | const moxie_opc_info_t *opcode; |
| 61 | opcode_hash_control = hash_new (); |
| 62 | |
| 63 | /* Insert names into hash table. */ |
| 64 | for (count = 0, opcode = moxie_form1_opc_info; count++ < 64; opcode++) |
| 65 | hash_insert (opcode_hash_control, opcode->name, (char *) opcode); |
| 66 | |
| 67 | for (count = 0, opcode = moxie_form2_opc_info; count++ < 4; opcode++) |
| 68 | hash_insert (opcode_hash_control, opcode->name, (char *) opcode); |
| 69 | |
| 70 | for (count = 0, opcode = moxie_form3_opc_info; count++ < 4; opcode++) |
| 71 | hash_insert (opcode_hash_control, opcode->name, (char *) opcode); |
| 72 | |
| 73 | bfd_set_arch_mach (stdoutput, TARGET_ARCH, 0); |
| 74 | } |
| 75 | |
| 76 | /* Parse an expression and then restore the input line pointer. */ |
| 77 | |
| 78 | static char * |
| 79 | parse_exp_save_ilp (char *s, expressionS *op) |
| 80 | { |
| 81 | char *save = input_line_pointer; |
| 82 | |
| 83 | input_line_pointer = s; |
| 84 | expression (op); |
| 85 | s = input_line_pointer; |
| 86 | input_line_pointer = save; |
| 87 | return s; |
| 88 | } |
| 89 | |
| 90 | static int |
| 91 | parse_register_operand (char **ptr) |
| 92 | { |
| 93 | int reg; |
| 94 | char *s = *ptr; |
| 95 | |
| 96 | if (*s != '$') |
| 97 | { |
| 98 | as_bad ("expecting register"); |
| 99 | ignore_rest_of_line (); |
| 100 | return -1; |
| 101 | } |
| 102 | if (s[1] == 'f' && s[2] == 'p') |
| 103 | { |
| 104 | *ptr += 3; |
| 105 | return 0; |
| 106 | } |
| 107 | if (s[1] == 's' && s[2] == 'p') |
| 108 | { |
| 109 | *ptr += 3; |
| 110 | return 1; |
| 111 | } |
| 112 | if (s[1] == 'r') |
| 113 | { |
| 114 | reg = s[2] - '0'; |
| 115 | if ((reg < 0) || (reg > 9)) |
| 116 | { |
| 117 | as_bad ("illegal register number"); |
| 118 | ignore_rest_of_line (); |
| 119 | return -1; |
| 120 | } |
| 121 | if (reg == 1) |
| 122 | { |
| 123 | int r2 = s[3] - '0'; |
| 124 | if ((r2 >= 0) && (r2 <= 3)) |
| 125 | { |
| 126 | reg = 10 + r2; |
| 127 | *ptr += 1; |
| 128 | } |
| 129 | } |
| 130 | } |
| 131 | else |
| 132 | { |
| 133 | as_bad ("illegal register number"); |
| 134 | ignore_rest_of_line (); |
| 135 | return -1; |
| 136 | } |
| 137 | |
| 138 | *ptr += 3; |
| 139 | |
| 140 | return reg + 2; |
| 141 | } |
| 142 | |
| 143 | /* This is the guts of the machine-dependent assembler. STR points to |
| 144 | a machine dependent instruction. This function is supposed to emit |
| 145 | the frags/bytes it assembles to. */ |
| 146 | |
| 147 | void |
| 148 | md_assemble (char *str) |
| 149 | { |
| 150 | char *op_start; |
| 151 | char *op_end; |
| 152 | |
| 153 | moxie_opc_info_t *opcode; |
| 154 | char *p; |
| 155 | char pend; |
| 156 | |
| 157 | unsigned short iword = 0; |
| 158 | |
| 159 | int nlen = 0; |
| 160 | |
| 161 | /* Drop leading whitespace. */ |
| 162 | while (*str == ' ') |
| 163 | str++; |
| 164 | |
| 165 | /* Find the op code end. */ |
| 166 | op_start = str; |
| 167 | for (op_end = str; |
| 168 | *op_end && !is_end_of_line[*op_end & 0xff] && *op_end != ' '; |
| 169 | op_end++) |
| 170 | nlen++; |
| 171 | |
| 172 | pend = *op_end; |
| 173 | *op_end = 0; |
| 174 | |
| 175 | if (nlen == 0) |
| 176 | as_bad (_("can't find opcode ")); |
| 177 | opcode = (moxie_opc_info_t *) hash_find (opcode_hash_control, op_start); |
| 178 | *op_end = pend; |
| 179 | |
| 180 | if (opcode == NULL) |
| 181 | { |
| 182 | as_bad (_("unknown opcode %s"), op_start); |
| 183 | return; |
| 184 | } |
| 185 | |
| 186 | p = frag_more (2); |
| 187 | |
| 188 | switch (opcode->itype) |
| 189 | { |
| 190 | case MOXIE_F2_A8V: |
| 191 | iword = (1<<15) | (opcode->opcode << 12); |
| 192 | while (ISSPACE (*op_end)) |
| 193 | op_end++; |
| 194 | { |
| 195 | expressionS arg; |
| 196 | int reg; |
| 197 | reg = parse_register_operand (&op_end); |
| 198 | iword += (reg << 8); |
| 199 | if (*op_end != ',') |
| 200 | as_warn ("expecting comma delimeted register operands"); |
| 201 | op_end++; |
| 202 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 203 | fix_new_exp (frag_now, |
| 204 | ((p+1) - frag_now->fr_literal), |
| 205 | 1, |
| 206 | &arg, |
| 207 | 0, |
| 208 | BFD_RELOC_8); |
| 209 | } |
| 210 | break; |
| 211 | case MOXIE_F1_AB: |
| 212 | iword = opcode->opcode << 8; |
| 213 | while (ISSPACE (*op_end)) |
| 214 | op_end++; |
| 215 | { |
| 216 | int dest, src; |
| 217 | dest = parse_register_operand (&op_end); |
| 218 | if (*op_end != ',') |
| 219 | as_warn ("expecting comma delimeted register operands"); |
| 220 | op_end++; |
| 221 | src = parse_register_operand (&op_end); |
| 222 | iword += (dest << 4) + src; |
| 223 | while (ISSPACE (*op_end)) |
| 224 | op_end++; |
| 225 | if (*op_end != 0) |
| 226 | as_warn ("extra stuff on line ignored"); |
| 227 | } |
| 228 | break; |
| 229 | case MOXIE_F1_A4: |
| 230 | iword = opcode->opcode << 8; |
| 231 | while (ISSPACE (*op_end)) |
| 232 | op_end++; |
| 233 | { |
| 234 | expressionS arg; |
| 235 | char *where; |
| 236 | int regnum; |
| 237 | |
| 238 | regnum = parse_register_operand (&op_end); |
| 239 | while (ISSPACE (*op_end)) |
| 240 | op_end++; |
| 241 | |
| 242 | iword += (regnum << 4); |
| 243 | |
| 244 | if (*op_end != ',') |
| 245 | { |
| 246 | as_bad ("expecting comma delimited operands"); |
| 247 | ignore_rest_of_line (); |
| 248 | return; |
| 249 | } |
| 250 | op_end++; |
| 251 | |
| 252 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 253 | where = frag_more (4); |
| 254 | fix_new_exp (frag_now, |
| 255 | (where - frag_now->fr_literal), |
| 256 | 4, |
| 257 | &arg, |
| 258 | 0, |
| 259 | BFD_RELOC_32); |
| 260 | } |
| 261 | break; |
| 262 | case MOXIE_F1_M: |
| 263 | case MOXIE_F1_4: |
| 264 | iword = opcode->opcode << 8; |
| 265 | while (ISSPACE (*op_end)) |
| 266 | op_end++; |
| 267 | { |
| 268 | expressionS arg; |
| 269 | char *where; |
| 270 | |
| 271 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 272 | where = frag_more (4); |
| 273 | fix_new_exp (frag_now, |
| 274 | (where - frag_now->fr_literal), |
| 275 | 4, |
| 276 | &arg, |
| 277 | 0, |
| 278 | BFD_RELOC_32); |
| 279 | } |
| 280 | break; |
| 281 | case MOXIE_F1_NARG: |
| 282 | iword = opcode->opcode << 8; |
| 283 | while (ISSPACE (*op_end)) |
| 284 | op_end++; |
| 285 | if (*op_end != 0) |
| 286 | as_warn ("extra stuff on line ignored"); |
| 287 | break; |
| 288 | case MOXIE_F1_A: |
| 289 | iword = opcode->opcode << 8; |
| 290 | while (ISSPACE (*op_end)) |
| 291 | op_end++; |
| 292 | { |
| 293 | int reg; |
| 294 | reg = parse_register_operand (&op_end); |
| 295 | while (ISSPACE (*op_end)) |
| 296 | op_end++; |
| 297 | if (*op_end != 0) |
| 298 | as_warn ("extra stuff on line ignored"); |
| 299 | iword += (reg << 4); |
| 300 | } |
| 301 | break; |
| 302 | case MOXIE_F1_ABi: |
| 303 | iword = opcode->opcode << 8; |
| 304 | while (ISSPACE (*op_end)) |
| 305 | op_end++; |
| 306 | { |
| 307 | int a, b; |
| 308 | a = parse_register_operand (&op_end); |
| 309 | if (*op_end != ',') |
| 310 | as_warn ("expecting comma delimeted register operands"); |
| 311 | op_end++; |
| 312 | if (*op_end != '(') |
| 313 | { |
| 314 | as_bad ("expecting indirect register `($rA)'"); |
| 315 | ignore_rest_of_line (); |
| 316 | return; |
| 317 | } |
| 318 | op_end++; |
| 319 | b = parse_register_operand (&op_end); |
| 320 | if (*op_end != ')') |
| 321 | { |
| 322 | as_bad ("missing closing parenthesis"); |
| 323 | ignore_rest_of_line (); |
| 324 | return; |
| 325 | } |
| 326 | op_end++; |
| 327 | iword += (a << 4) + b; |
| 328 | while (ISSPACE (*op_end)) |
| 329 | op_end++; |
| 330 | if (*op_end != 0) |
| 331 | as_warn ("extra stuff on line ignored"); |
| 332 | } |
| 333 | break; |
| 334 | case MOXIE_F1_AiB: |
| 335 | iword = opcode->opcode << 8; |
| 336 | while (ISSPACE (*op_end)) |
| 337 | op_end++; |
| 338 | { |
| 339 | int a, b; |
| 340 | if (*op_end != '(') |
| 341 | { |
| 342 | as_bad ("expecting indirect register `($rA)'"); |
| 343 | ignore_rest_of_line (); |
| 344 | return; |
| 345 | } |
| 346 | op_end++; |
| 347 | a = parse_register_operand (&op_end); |
| 348 | if (*op_end != ')') |
| 349 | { |
| 350 | as_bad ("missing closing parenthesis"); |
| 351 | ignore_rest_of_line (); |
| 352 | return; |
| 353 | } |
| 354 | op_end++; |
| 355 | if (*op_end != ',') |
| 356 | as_warn ("expecting comma delimeted register operands"); |
| 357 | op_end++; |
| 358 | b = parse_register_operand (&op_end); |
| 359 | iword += (a << 4) + b; |
| 360 | while (ISSPACE (*op_end)) |
| 361 | op_end++; |
| 362 | if (*op_end != 0) |
| 363 | as_warn ("extra stuff on line ignored"); |
| 364 | } |
| 365 | break; |
| 366 | case MOXIE_F1_4A: |
| 367 | iword = opcode->opcode << 8; |
| 368 | while (ISSPACE (*op_end)) |
| 369 | op_end++; |
| 370 | { |
| 371 | expressionS arg; |
| 372 | char *where; |
| 373 | int a; |
| 374 | |
| 375 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 376 | where = frag_more (4); |
| 377 | fix_new_exp (frag_now, |
| 378 | (where - frag_now->fr_literal), |
| 379 | 4, |
| 380 | &arg, |
| 381 | 0, |
| 382 | BFD_RELOC_32); |
| 383 | |
| 384 | if (*op_end != ',') |
| 385 | { |
| 386 | as_bad ("expecting comma delimited operands"); |
| 387 | ignore_rest_of_line (); |
| 388 | return; |
| 389 | } |
| 390 | op_end++; |
| 391 | |
| 392 | a = parse_register_operand (&op_end); |
| 393 | while (ISSPACE (*op_end)) |
| 394 | op_end++; |
| 395 | if (*op_end != 0) |
| 396 | as_warn ("extra stuff on line ignored"); |
| 397 | |
| 398 | iword += (a << 4); |
| 399 | } |
| 400 | break; |
| 401 | case MOXIE_F1_ABi4: |
| 402 | iword = opcode->opcode << 8; |
| 403 | while (ISSPACE (*op_end)) |
| 404 | op_end++; |
| 405 | { |
| 406 | expressionS arg; |
| 407 | char *offset; |
| 408 | int a, b; |
| 409 | |
| 410 | a = parse_register_operand (&op_end); |
| 411 | while (ISSPACE (*op_end)) |
| 412 | op_end++; |
| 413 | |
| 414 | if (*op_end != ',') |
| 415 | { |
| 416 | as_bad ("expecting comma delimited operands"); |
| 417 | ignore_rest_of_line (); |
| 418 | return; |
| 419 | } |
| 420 | op_end++; |
| 421 | |
| 422 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 423 | offset = frag_more (4); |
| 424 | fix_new_exp (frag_now, |
| 425 | (offset - frag_now->fr_literal), |
| 426 | 4, |
| 427 | &arg, |
| 428 | 0, |
| 429 | BFD_RELOC_32); |
| 430 | |
| 431 | if (*op_end != '(') |
| 432 | { |
| 433 | as_bad ("expecting indirect register `($rX)'"); |
| 434 | ignore_rest_of_line (); |
| 435 | return; |
| 436 | } |
| 437 | op_end++; |
| 438 | b = parse_register_operand (&op_end); |
| 439 | if (*op_end != ')') |
| 440 | { |
| 441 | as_bad ("missing closing parenthesis"); |
| 442 | ignore_rest_of_line (); |
| 443 | return; |
| 444 | } |
| 445 | op_end++; |
| 446 | |
| 447 | while (ISSPACE (*op_end)) |
| 448 | op_end++; |
| 449 | if (*op_end != 0) |
| 450 | as_warn ("extra stuff on line ignored"); |
| 451 | |
| 452 | iword += (a << 4) + b; |
| 453 | } |
| 454 | break; |
| 455 | case MOXIE_F1_AiB4: |
| 456 | iword = opcode->opcode << 8; |
| 457 | while (ISSPACE (*op_end)) |
| 458 | op_end++; |
| 459 | { |
| 460 | expressionS arg; |
| 461 | char *offset; |
| 462 | int a, b; |
| 463 | |
| 464 | op_end = parse_exp_save_ilp (op_end, &arg); |
| 465 | offset = frag_more (4); |
| 466 | fix_new_exp (frag_now, |
| 467 | (offset - frag_now->fr_literal), |
| 468 | 4, |
| 469 | &arg, |
| 470 | 0, |
| 471 | BFD_RELOC_32); |
| 472 | |
| 473 | if (*op_end != '(') |
| 474 | { |
| 475 | as_bad ("expecting indirect register `($rX)'"); |
| 476 | ignore_rest_of_line (); |
| 477 | return; |
| 478 | } |
| 479 | op_end++; |
| 480 | a = parse_register_operand (&op_end); |
| 481 | if (*op_end != ')') |
| 482 | { |
| 483 | as_bad ("missing closing parenthesis"); |
| 484 | ignore_rest_of_line (); |
| 485 | return; |
| 486 | } |
| 487 | op_end++; |
| 488 | |
| 489 | if (*op_end != ',') |
| 490 | { |
| 491 | as_bad ("expecting comma delimited operands"); |
| 492 | ignore_rest_of_line (); |
| 493 | return; |
| 494 | } |
| 495 | op_end++; |
| 496 | |
| 497 | b = parse_register_operand (&op_end); |
| 498 | while (ISSPACE (*op_end)) |
| 499 | op_end++; |
| 500 | |
| 501 | while (ISSPACE (*op_end)) |
| 502 | op_end++; |
| 503 | if (*op_end != 0) |
| 504 | as_warn ("extra stuff on line ignored"); |
| 505 | |
| 506 | iword += (a << 4) + b; |
| 507 | } |
| 508 | break; |
| 509 | case MOXIE_F2_NARG: |
| 510 | iword = opcode->opcode << 12; |
| 511 | while (ISSPACE (*op_end)) |
| 512 | op_end++; |
| 513 | if (*op_end != 0) |
| 514 | as_warn ("extra stuff on line ignored"); |
| 515 | break; |
| 516 | default: |
| 517 | abort(); |
| 518 | } |
| 519 | |
| 520 | md_number_to_chars (p, iword, 2); |
| 521 | |
| 522 | while (ISSPACE (*op_end)) |
| 523 | op_end++; |
| 524 | |
| 525 | if (*op_end != 0) |
| 526 | as_warn ("extra stuff on line ignored"); |
| 527 | |
| 528 | if (pending_reloc) |
| 529 | as_bad ("Something forgot to clean up\n"); |
| 530 | } |
| 531 | |
| 532 | /* Turn a string in input_line_pointer into a floating point constant |
| 533 | of type type, and store the appropriate bytes in *LITP. The number |
| 534 | of LITTLENUMS emitted is stored in *SIZEP . An error message is |
| 535 | returned, or NULL on OK. */ |
| 536 | |
| 537 | char * |
| 538 | md_atof (int type, char *litP, int *sizeP) |
| 539 | { |
| 540 | int prec; |
| 541 | LITTLENUM_TYPE words[4]; |
| 542 | char *t; |
| 543 | int i; |
| 544 | |
| 545 | switch (type) |
| 546 | { |
| 547 | case 'f': |
| 548 | prec = 2; |
| 549 | break; |
| 550 | |
| 551 | case 'd': |
| 552 | prec = 4; |
| 553 | break; |
| 554 | |
| 555 | default: |
| 556 | *sizeP = 0; |
| 557 | return _("bad call to md_atof"); |
| 558 | } |
| 559 | |
| 560 | t = atof_ieee (input_line_pointer, type, words); |
| 561 | if (t) |
| 562 | input_line_pointer = t; |
| 563 | |
| 564 | *sizeP = prec * 2; |
| 565 | |
| 566 | for (i = prec - 1; i >= 0; i--) |
| 567 | { |
| 568 | md_number_to_chars (litP, (valueT) words[i], 2); |
| 569 | litP += 2; |
| 570 | } |
| 571 | |
| 572 | return NULL; |
| 573 | } |
| 574 | \f |
| 575 | const char *md_shortopts = ""; |
| 576 | |
| 577 | struct option md_longopts[] = |
| 578 | { |
| 579 | {NULL, no_argument, NULL, 0} |
| 580 | }; |
| 581 | size_t md_longopts_size = sizeof (md_longopts); |
| 582 | |
| 583 | /* We have no target specific options yet, so these next |
| 584 | two functions are empty. */ |
| 585 | int |
| 586 | md_parse_option (int c ATTRIBUTE_UNUSED, char *arg ATTRIBUTE_UNUSED) |
| 587 | { |
| 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | void |
| 592 | md_show_usage (FILE *stream ATTRIBUTE_UNUSED) |
| 593 | { |
| 594 | } |
| 595 | |
| 596 | /* Apply a fixup to the object file. */ |
| 597 | |
| 598 | void |
| 599 | md_apply_fix (fixS *fixP ATTRIBUTE_UNUSED, valueT * valP ATTRIBUTE_UNUSED, segT seg ATTRIBUTE_UNUSED) |
| 600 | { |
| 601 | char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; |
| 602 | long val = *valP; |
| 603 | long max, min; |
| 604 | int shift; |
| 605 | |
| 606 | max = min = 0; |
| 607 | shift = 0; |
| 608 | switch (fixP->fx_r_type) |
| 609 | { |
| 610 | case BFD_RELOC_32: |
| 611 | *buf++ = val >> 24; |
| 612 | *buf++ = val >> 16; |
| 613 | *buf++ = val >> 8; |
| 614 | *buf++ = val >> 0; |
| 615 | break; |
| 616 | |
| 617 | case BFD_RELOC_16: |
| 618 | *buf++ = val >> 8; |
| 619 | *buf++ = val >> 0; |
| 620 | break; |
| 621 | |
| 622 | case BFD_RELOC_8: |
| 623 | *buf++ = val; |
| 624 | break; |
| 625 | |
| 626 | default: |
| 627 | abort (); |
| 628 | } |
| 629 | |
| 630 | if (max != 0 && (val < min || val > max)) |
| 631 | as_bad_where (fixP->fx_file, fixP->fx_line, _("offset out of range")); |
| 632 | |
| 633 | if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0) |
| 634 | fixP->fx_done = 1; |
| 635 | } |
| 636 | |
| 637 | /* Put number into target byte order (big endian). */ |
| 638 | |
| 639 | void |
| 640 | md_number_to_chars (char *ptr, valueT use, int nbytes) |
| 641 | { |
| 642 | number_to_chars_bigendian (ptr, use, nbytes); |
| 643 | } |
| 644 | |
| 645 | /* Generate a machine-dependent relocation. */ |
| 646 | arelent * |
| 647 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixP) |
| 648 | { |
| 649 | arelent *relP; |
| 650 | bfd_reloc_code_real_type code; |
| 651 | |
| 652 | switch (fixP->fx_r_type) |
| 653 | { |
| 654 | case BFD_RELOC_32: |
| 655 | code = fixP->fx_r_type; |
| 656 | break; |
| 657 | default: |
| 658 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 659 | _("Semantics error. This type of operand can not be relocated, it must be an assembly-time constant")); |
| 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | relP = xmalloc (sizeof (arelent)); |
| 664 | assert (relP != 0); |
| 665 | relP->sym_ptr_ptr = xmalloc (sizeof (asymbol *)); |
| 666 | *relP->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); |
| 667 | relP->address = fixP->fx_frag->fr_address + fixP->fx_where; |
| 668 | |
| 669 | relP->addend = fixP->fx_offset; |
| 670 | |
| 671 | /* This is the standard place for KLUDGEs to work around bugs in |
| 672 | bfd_install_relocation (first such note in the documentation |
| 673 | appears with binutils-2.8). |
| 674 | |
| 675 | That function bfd_install_relocation does the wrong thing with |
| 676 | putting stuff into the addend of a reloc (it should stay out) for a |
| 677 | weak symbol. The really bad thing is that it adds the |
| 678 | "segment-relative offset" of the symbol into the reloc. In this |
| 679 | case, the reloc should instead be relative to the symbol with no |
| 680 | other offset than the assembly code shows; and since the symbol is |
| 681 | weak, any local definition should be ignored until link time (or |
| 682 | thereafter). |
| 683 | To wit: weaksym+42 should be weaksym+42 in the reloc, |
| 684 | not weaksym+(offset_from_segment_of_local_weaksym_definition) |
| 685 | |
| 686 | To "work around" this, we subtract the segment-relative offset of |
| 687 | "known" weak symbols. This evens out the extra offset. |
| 688 | |
| 689 | That happens for a.out but not for ELF, since for ELF, |
| 690 | bfd_install_relocation uses the "special function" field of the |
| 691 | howto, and does not execute the code that needs to be undone. */ |
| 692 | |
| 693 | if (OUTPUT_FLAVOR == bfd_target_aout_flavour |
| 694 | && fixP->fx_addsy && S_IS_WEAK (fixP->fx_addsy) |
| 695 | && ! bfd_is_und_section (S_GET_SEGMENT (fixP->fx_addsy))) |
| 696 | { |
| 697 | relP->addend -= S_GET_VALUE (fixP->fx_addsy); |
| 698 | } |
| 699 | |
| 700 | relP->howto = bfd_reloc_type_lookup (stdoutput, code); |
| 701 | if (! relP->howto) |
| 702 | { |
| 703 | const char *name; |
| 704 | |
| 705 | name = S_GET_NAME (fixP->fx_addsy); |
| 706 | if (name == NULL) |
| 707 | name = _("<unknown>"); |
| 708 | as_fatal (_("Cannot generate relocation type for symbol %s, code %s"), |
| 709 | name, bfd_get_reloc_code_name (code)); |
| 710 | } |
| 711 | |
| 712 | return relP; |
| 713 | } |
| 714 | |
| 715 | /* Decide from what point a pc-relative relocation is relative to, |
| 716 | relative to the pc-relative fixup. Er, relatively speaking. */ |
| 717 | long |
| 718 | md_pcrel_from (fixS *fixP) |
| 719 | { |
| 720 | valueT addr = fixP->fx_where + fixP->fx_frag->fr_address; |
| 721 | |
| 722 | fprintf (stderr, "md_pcrel_from 0x%d\n", fixP->fx_r_type); |
| 723 | |
| 724 | switch (fixP->fx_r_type) |
| 725 | { |
| 726 | case BFD_RELOC_32: |
| 727 | return addr + 4; |
| 728 | default: |
| 729 | abort (); |
| 730 | return addr; |
| 731 | } |
| 732 | } |