| 1 | /* BFD back-end for ARM COFF files. |
| 2 | Copyright (C) 1990-2017 Free Software Foundation, Inc. |
| 3 | Written by Cygnus Support. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program 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 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program 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 this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "coff/arm.h" |
| 26 | #include "coff/internal.h" |
| 27 | |
| 28 | #ifdef COFF_WITH_PE |
| 29 | #include "coff/pe.h" |
| 30 | #endif |
| 31 | |
| 32 | #include "libcoff.h" |
| 33 | |
| 34 | /* Macros for manipulation the bits in the flags field of the coff data |
| 35 | structure. */ |
| 36 | #define APCS_26_FLAG(abfd) \ |
| 37 | (coff_data (abfd)->flags & F_APCS_26) |
| 38 | |
| 39 | #define APCS_FLOAT_FLAG(abfd) \ |
| 40 | (coff_data (abfd)->flags & F_APCS_FLOAT) |
| 41 | |
| 42 | #define PIC_FLAG(abfd) \ |
| 43 | (coff_data (abfd)->flags & F_PIC) |
| 44 | |
| 45 | #define APCS_SET(abfd) \ |
| 46 | (coff_data (abfd)->flags & F_APCS_SET) |
| 47 | |
| 48 | #define SET_APCS_FLAGS(abfd, flgs) \ |
| 49 | do \ |
| 50 | { \ |
| 51 | coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \ |
| 52 | coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \ |
| 53 | } \ |
| 54 | while (0) |
| 55 | |
| 56 | #define INTERWORK_FLAG(abfd) \ |
| 57 | (coff_data (abfd)->flags & F_INTERWORK) |
| 58 | |
| 59 | #define INTERWORK_SET(abfd) \ |
| 60 | (coff_data (abfd)->flags & F_INTERWORK_SET) |
| 61 | |
| 62 | #define SET_INTERWORK_FLAG(abfd, flg) \ |
| 63 | do \ |
| 64 | { \ |
| 65 | coff_data (abfd)->flags &= ~F_INTERWORK; \ |
| 66 | coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \ |
| 67 | } \ |
| 68 | while (0) |
| 69 | |
| 70 | #ifndef NUM_ELEM |
| 71 | #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0])) |
| 72 | #endif |
| 73 | |
| 74 | typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype; |
| 75 | /* Some typedefs for holding instructions. */ |
| 76 | typedef unsigned long int insn32; |
| 77 | typedef unsigned short int insn16; |
| 78 | |
| 79 | /* The linker script knows the section names for placement. |
| 80 | The entry_names are used to do simple name mangling on the stubs. |
| 81 | Given a function name, and its type, the stub can be found. The |
| 82 | name can be changed. The only requirement is the %s be present. */ |
| 83 | |
| 84 | #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" |
| 85 | #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" |
| 86 | |
| 87 | #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" |
| 88 | #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" |
| 89 | |
| 90 | /* Used by the assembler. */ |
| 91 | |
| 92 | static bfd_reloc_status_type |
| 93 | coff_arm_reloc (bfd *abfd, |
| 94 | arelent *reloc_entry, |
| 95 | asymbol *symbol ATTRIBUTE_UNUSED, |
| 96 | void * data, |
| 97 | asection *input_section ATTRIBUTE_UNUSED, |
| 98 | bfd *output_bfd, |
| 99 | char **error_message ATTRIBUTE_UNUSED) |
| 100 | { |
| 101 | symvalue diff; |
| 102 | |
| 103 | if (output_bfd == NULL) |
| 104 | return bfd_reloc_continue; |
| 105 | |
| 106 | diff = reloc_entry->addend; |
| 107 | |
| 108 | #define DOIT(x) \ |
| 109 | x = ((x & ~howto->dst_mask) \ |
| 110 | | (((x & howto->src_mask) + diff) & howto->dst_mask)) |
| 111 | |
| 112 | if (diff != 0) |
| 113 | { |
| 114 | reloc_howto_type *howto = reloc_entry->howto; |
| 115 | unsigned char *addr = (unsigned char *) data + reloc_entry->address; |
| 116 | |
| 117 | switch (howto->size) |
| 118 | { |
| 119 | case 0: |
| 120 | { |
| 121 | char x = bfd_get_8 (abfd, addr); |
| 122 | DOIT (x); |
| 123 | bfd_put_8 (abfd, x, addr); |
| 124 | } |
| 125 | break; |
| 126 | |
| 127 | case 1: |
| 128 | { |
| 129 | short x = bfd_get_16 (abfd, addr); |
| 130 | DOIT (x); |
| 131 | bfd_put_16 (abfd, (bfd_vma) x, addr); |
| 132 | } |
| 133 | break; |
| 134 | |
| 135 | case 2: |
| 136 | { |
| 137 | long x = bfd_get_32 (abfd, addr); |
| 138 | DOIT (x); |
| 139 | bfd_put_32 (abfd, (bfd_vma) x, addr); |
| 140 | } |
| 141 | break; |
| 142 | |
| 143 | default: |
| 144 | abort (); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | /* Now let bfd_perform_relocation finish everything up. */ |
| 149 | return bfd_reloc_continue; |
| 150 | } |
| 151 | |
| 152 | /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name() |
| 153 | in this file), then TARGET_UNDERSCORE should be defined, otherwise it |
| 154 | should not. */ |
| 155 | #ifndef TARGET_UNDERSCORE |
| 156 | #define TARGET_UNDERSCORE '_' |
| 157 | #endif |
| 158 | |
| 159 | #ifndef PCRELOFFSET |
| 160 | #define PCRELOFFSET TRUE |
| 161 | #endif |
| 162 | |
| 163 | /* These most certainly belong somewhere else. Just had to get rid of |
| 164 | the manifest constants in the code. */ |
| 165 | |
| 166 | #ifdef ARM_WINCE |
| 167 | |
| 168 | #define ARM_26D 0 |
| 169 | #define ARM_32 1 |
| 170 | #define ARM_RVA32 2 |
| 171 | #define ARM_26 3 |
| 172 | #define ARM_THUMB12 4 |
| 173 | #define ARM_SECTION 14 |
| 174 | #define ARM_SECREL 15 |
| 175 | |
| 176 | #else |
| 177 | |
| 178 | #define ARM_8 0 |
| 179 | #define ARM_16 1 |
| 180 | #define ARM_32 2 |
| 181 | #define ARM_26 3 |
| 182 | #define ARM_DISP8 4 |
| 183 | #define ARM_DISP16 5 |
| 184 | #define ARM_DISP32 6 |
| 185 | #define ARM_26D 7 |
| 186 | /* 8 is unused. */ |
| 187 | #define ARM_NEG16 9 |
| 188 | #define ARM_NEG32 10 |
| 189 | #define ARM_RVA32 11 |
| 190 | #define ARM_THUMB9 12 |
| 191 | #define ARM_THUMB12 13 |
| 192 | #define ARM_THUMB23 14 |
| 193 | |
| 194 | #endif |
| 195 | |
| 196 | static bfd_reloc_status_type aoutarm_fix_pcrel_26_done |
| 197 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
| 198 | static bfd_reloc_status_type aoutarm_fix_pcrel_26 |
| 199 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
| 200 | static bfd_reloc_status_type coff_thumb_pcrel_12 |
| 201 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
| 202 | #ifndef ARM_WINCE |
| 203 | static bfd_reloc_status_type coff_thumb_pcrel_9 |
| 204 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
| 205 | static bfd_reloc_status_type coff_thumb_pcrel_23 |
| 206 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
| 207 | #endif |
| 208 | |
| 209 | static reloc_howto_type aoutarm_std_reloc_howto[] = |
| 210 | { |
| 211 | #ifdef ARM_WINCE |
| 212 | HOWTO (ARM_26D, |
| 213 | 2, |
| 214 | 2, |
| 215 | 24, |
| 216 | TRUE, |
| 217 | 0, |
| 218 | complain_overflow_dont, |
| 219 | aoutarm_fix_pcrel_26_done, |
| 220 | "ARM_26D", |
| 221 | TRUE, /* partial_inplace. */ |
| 222 | 0x00ffffff, |
| 223 | 0x0, |
| 224 | PCRELOFFSET), |
| 225 | HOWTO (ARM_32, |
| 226 | 0, |
| 227 | 2, |
| 228 | 32, |
| 229 | FALSE, |
| 230 | 0, |
| 231 | complain_overflow_bitfield, |
| 232 | coff_arm_reloc, |
| 233 | "ARM_32", |
| 234 | TRUE, /* partial_inplace. */ |
| 235 | 0xffffffff, |
| 236 | 0xffffffff, |
| 237 | PCRELOFFSET), |
| 238 | HOWTO (ARM_RVA32, |
| 239 | 0, |
| 240 | 2, |
| 241 | 32, |
| 242 | FALSE, |
| 243 | 0, |
| 244 | complain_overflow_bitfield, |
| 245 | coff_arm_reloc, |
| 246 | "ARM_RVA32", |
| 247 | TRUE, /* partial_inplace. */ |
| 248 | 0xffffffff, |
| 249 | 0xffffffff, |
| 250 | PCRELOFFSET), |
| 251 | HOWTO (ARM_26, |
| 252 | 2, |
| 253 | 2, |
| 254 | 24, |
| 255 | TRUE, |
| 256 | 0, |
| 257 | complain_overflow_signed, |
| 258 | aoutarm_fix_pcrel_26 , |
| 259 | "ARM_26", |
| 260 | FALSE, |
| 261 | 0x00ffffff, |
| 262 | 0x00ffffff, |
| 263 | PCRELOFFSET), |
| 264 | HOWTO (ARM_THUMB12, |
| 265 | 1, |
| 266 | 1, |
| 267 | 11, |
| 268 | TRUE, |
| 269 | 0, |
| 270 | complain_overflow_signed, |
| 271 | coff_thumb_pcrel_12 , |
| 272 | "ARM_THUMB12", |
| 273 | FALSE, |
| 274 | 0x000007ff, |
| 275 | 0x000007ff, |
| 276 | PCRELOFFSET), |
| 277 | EMPTY_HOWTO (-1), |
| 278 | EMPTY_HOWTO (-1), |
| 279 | EMPTY_HOWTO (-1), |
| 280 | EMPTY_HOWTO (-1), |
| 281 | EMPTY_HOWTO (-1), |
| 282 | EMPTY_HOWTO (-1), |
| 283 | EMPTY_HOWTO (-1), |
| 284 | EMPTY_HOWTO (-1), |
| 285 | EMPTY_HOWTO (-1), |
| 286 | HOWTO (ARM_SECTION, |
| 287 | 0, |
| 288 | 1, |
| 289 | 16, |
| 290 | FALSE, |
| 291 | 0, |
| 292 | complain_overflow_bitfield, |
| 293 | coff_arm_reloc, |
| 294 | "ARM_SECTION", |
| 295 | TRUE, /* partial_inplace. */ |
| 296 | 0x0000ffff, |
| 297 | 0x0000ffff, |
| 298 | PCRELOFFSET), |
| 299 | HOWTO (ARM_SECREL, |
| 300 | 0, |
| 301 | 2, |
| 302 | 32, |
| 303 | FALSE, |
| 304 | 0, |
| 305 | complain_overflow_bitfield, |
| 306 | coff_arm_reloc, |
| 307 | "ARM_SECREL", |
| 308 | TRUE, /* partial_inplace. */ |
| 309 | 0xffffffff, |
| 310 | 0xffffffff, |
| 311 | PCRELOFFSET), |
| 312 | #else /* not ARM_WINCE */ |
| 313 | HOWTO (ARM_8, |
| 314 | 0, |
| 315 | 0, |
| 316 | 8, |
| 317 | FALSE, |
| 318 | 0, |
| 319 | complain_overflow_bitfield, |
| 320 | coff_arm_reloc, |
| 321 | "ARM_8", |
| 322 | TRUE, |
| 323 | 0x000000ff, |
| 324 | 0x000000ff, |
| 325 | PCRELOFFSET), |
| 326 | HOWTO (ARM_16, |
| 327 | 0, |
| 328 | 1, |
| 329 | 16, |
| 330 | FALSE, |
| 331 | 0, |
| 332 | complain_overflow_bitfield, |
| 333 | coff_arm_reloc, |
| 334 | "ARM_16", |
| 335 | TRUE, |
| 336 | 0x0000ffff, |
| 337 | 0x0000ffff, |
| 338 | PCRELOFFSET), |
| 339 | HOWTO (ARM_32, |
| 340 | 0, |
| 341 | 2, |
| 342 | 32, |
| 343 | FALSE, |
| 344 | 0, |
| 345 | complain_overflow_bitfield, |
| 346 | coff_arm_reloc, |
| 347 | "ARM_32", |
| 348 | TRUE, |
| 349 | 0xffffffff, |
| 350 | 0xffffffff, |
| 351 | PCRELOFFSET), |
| 352 | HOWTO (ARM_26, |
| 353 | 2, |
| 354 | 2, |
| 355 | 24, |
| 356 | TRUE, |
| 357 | 0, |
| 358 | complain_overflow_signed, |
| 359 | aoutarm_fix_pcrel_26 , |
| 360 | "ARM_26", |
| 361 | FALSE, |
| 362 | 0x00ffffff, |
| 363 | 0x00ffffff, |
| 364 | PCRELOFFSET), |
| 365 | HOWTO (ARM_DISP8, |
| 366 | 0, |
| 367 | 0, |
| 368 | 8, |
| 369 | TRUE, |
| 370 | 0, |
| 371 | complain_overflow_signed, |
| 372 | coff_arm_reloc, |
| 373 | "ARM_DISP8", |
| 374 | TRUE, |
| 375 | 0x000000ff, |
| 376 | 0x000000ff, |
| 377 | TRUE), |
| 378 | HOWTO (ARM_DISP16, |
| 379 | 0, |
| 380 | 1, |
| 381 | 16, |
| 382 | TRUE, |
| 383 | 0, |
| 384 | complain_overflow_signed, |
| 385 | coff_arm_reloc, |
| 386 | "ARM_DISP16", |
| 387 | TRUE, |
| 388 | 0x0000ffff, |
| 389 | 0x0000ffff, |
| 390 | TRUE), |
| 391 | HOWTO (ARM_DISP32, |
| 392 | 0, |
| 393 | 2, |
| 394 | 32, |
| 395 | TRUE, |
| 396 | 0, |
| 397 | complain_overflow_signed, |
| 398 | coff_arm_reloc, |
| 399 | "ARM_DISP32", |
| 400 | TRUE, |
| 401 | 0xffffffff, |
| 402 | 0xffffffff, |
| 403 | TRUE), |
| 404 | HOWTO (ARM_26D, |
| 405 | 2, |
| 406 | 2, |
| 407 | 24, |
| 408 | FALSE, |
| 409 | 0, |
| 410 | complain_overflow_dont, |
| 411 | aoutarm_fix_pcrel_26_done, |
| 412 | "ARM_26D", |
| 413 | TRUE, |
| 414 | 0x00ffffff, |
| 415 | 0x0, |
| 416 | FALSE), |
| 417 | /* 8 is unused */ |
| 418 | EMPTY_HOWTO (-1), |
| 419 | HOWTO (ARM_NEG16, |
| 420 | 0, |
| 421 | -1, |
| 422 | 16, |
| 423 | FALSE, |
| 424 | 0, |
| 425 | complain_overflow_bitfield, |
| 426 | coff_arm_reloc, |
| 427 | "ARM_NEG16", |
| 428 | TRUE, |
| 429 | 0x0000ffff, |
| 430 | 0x0000ffff, |
| 431 | FALSE), |
| 432 | HOWTO (ARM_NEG32, |
| 433 | 0, |
| 434 | -2, |
| 435 | 32, |
| 436 | FALSE, |
| 437 | 0, |
| 438 | complain_overflow_bitfield, |
| 439 | coff_arm_reloc, |
| 440 | "ARM_NEG32", |
| 441 | TRUE, |
| 442 | 0xffffffff, |
| 443 | 0xffffffff, |
| 444 | FALSE), |
| 445 | HOWTO (ARM_RVA32, |
| 446 | 0, |
| 447 | 2, |
| 448 | 32, |
| 449 | FALSE, |
| 450 | 0, |
| 451 | complain_overflow_bitfield, |
| 452 | coff_arm_reloc, |
| 453 | "ARM_RVA32", |
| 454 | TRUE, |
| 455 | 0xffffffff, |
| 456 | 0xffffffff, |
| 457 | PCRELOFFSET), |
| 458 | HOWTO (ARM_THUMB9, |
| 459 | 1, |
| 460 | 1, |
| 461 | 8, |
| 462 | TRUE, |
| 463 | 0, |
| 464 | complain_overflow_signed, |
| 465 | coff_thumb_pcrel_9 , |
| 466 | "ARM_THUMB9", |
| 467 | FALSE, |
| 468 | 0x000000ff, |
| 469 | 0x000000ff, |
| 470 | PCRELOFFSET), |
| 471 | HOWTO (ARM_THUMB12, |
| 472 | 1, |
| 473 | 1, |
| 474 | 11, |
| 475 | TRUE, |
| 476 | 0, |
| 477 | complain_overflow_signed, |
| 478 | coff_thumb_pcrel_12 , |
| 479 | "ARM_THUMB12", |
| 480 | FALSE, |
| 481 | 0x000007ff, |
| 482 | 0x000007ff, |
| 483 | PCRELOFFSET), |
| 484 | HOWTO (ARM_THUMB23, |
| 485 | 1, |
| 486 | 2, |
| 487 | 22, |
| 488 | TRUE, |
| 489 | 0, |
| 490 | complain_overflow_signed, |
| 491 | coff_thumb_pcrel_23 , |
| 492 | "ARM_THUMB23", |
| 493 | FALSE, |
| 494 | 0x07ff07ff, |
| 495 | 0x07ff07ff, |
| 496 | PCRELOFFSET) |
| 497 | #endif /* not ARM_WINCE */ |
| 498 | }; |
| 499 | |
| 500 | #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto) |
| 501 | |
| 502 | #ifdef COFF_WITH_PE |
| 503 | /* Return TRUE if this relocation should |
| 504 | appear in the output .reloc section. */ |
| 505 | |
| 506 | static bfd_boolean |
| 507 | in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED, |
| 508 | reloc_howto_type * howto) |
| 509 | { |
| 510 | return !howto->pc_relative && howto->type != ARM_RVA32; |
| 511 | } |
| 512 | #endif |
| 513 | |
| 514 | #define RTYPE2HOWTO(cache_ptr, dst) \ |
| 515 | (cache_ptr)->howto = \ |
| 516 | (dst)->r_type < NUM_RELOCS \ |
| 517 | ? aoutarm_std_reloc_howto + (dst)->r_type \ |
| 518 | : NULL |
| 519 | |
| 520 | #define coff_rtype_to_howto coff_arm_rtype_to_howto |
| 521 | |
| 522 | static reloc_howto_type * |
| 523 | coff_arm_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED, |
| 524 | asection *sec, |
| 525 | struct internal_reloc *rel, |
| 526 | struct coff_link_hash_entry *h ATTRIBUTE_UNUSED, |
| 527 | struct internal_syment *sym ATTRIBUTE_UNUSED, |
| 528 | bfd_vma *addendp) |
| 529 | { |
| 530 | reloc_howto_type * howto; |
| 531 | |
| 532 | if (rel->r_type >= NUM_RELOCS) |
| 533 | return NULL; |
| 534 | |
| 535 | howto = aoutarm_std_reloc_howto + rel->r_type; |
| 536 | |
| 537 | if (rel->r_type == ARM_RVA32) |
| 538 | *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase; |
| 539 | |
| 540 | #if defined COFF_WITH_PE && defined ARM_WINCE |
| 541 | if (rel->r_type == ARM_SECREL) |
| 542 | { |
| 543 | bfd_vma osect_vma; |
| 544 | |
| 545 | if (h && (h->type == bfd_link_hash_defined |
| 546 | || h->type == bfd_link_hash_defweak)) |
| 547 | osect_vma = h->root.u.def.section->output_section->vma; |
| 548 | else |
| 549 | { |
| 550 | int i; |
| 551 | |
| 552 | /* Sigh, the only way to get the section to offset against |
| 553 | is to find it the hard way. */ |
| 554 | |
| 555 | for (sec = abfd->sections, i = 1; i < sym->n_scnum; i++) |
| 556 | sec = sec->next; |
| 557 | |
| 558 | osect_vma = sec->output_section->vma; |
| 559 | } |
| 560 | |
| 561 | *addendp -= osect_vma; |
| 562 | } |
| 563 | #endif |
| 564 | |
| 565 | return howto; |
| 566 | } |
| 567 | |
| 568 | /* Used by the assembler. */ |
| 569 | |
| 570 | static bfd_reloc_status_type |
| 571 | aoutarm_fix_pcrel_26_done (bfd *abfd ATTRIBUTE_UNUSED, |
| 572 | arelent *reloc_entry ATTRIBUTE_UNUSED, |
| 573 | asymbol *symbol ATTRIBUTE_UNUSED, |
| 574 | void * data ATTRIBUTE_UNUSED, |
| 575 | asection *input_section ATTRIBUTE_UNUSED, |
| 576 | bfd *output_bfd ATTRIBUTE_UNUSED, |
| 577 | char **error_message ATTRIBUTE_UNUSED) |
| 578 | { |
| 579 | /* This is dead simple at present. */ |
| 580 | return bfd_reloc_ok; |
| 581 | } |
| 582 | |
| 583 | /* Used by the assembler. */ |
| 584 | |
| 585 | static bfd_reloc_status_type |
| 586 | aoutarm_fix_pcrel_26 (bfd *abfd, |
| 587 | arelent *reloc_entry, |
| 588 | asymbol *symbol, |
| 589 | void * data, |
| 590 | asection *input_section, |
| 591 | bfd *output_bfd, |
| 592 | char **error_message ATTRIBUTE_UNUSED) |
| 593 | { |
| 594 | bfd_vma relocation; |
| 595 | bfd_size_type addr = reloc_entry->address; |
| 596 | long target = bfd_get_32 (abfd, (bfd_byte *) data + addr); |
| 597 | bfd_reloc_status_type flag = bfd_reloc_ok; |
| 598 | |
| 599 | /* If this is an undefined symbol, return error. */ |
| 600 | if (bfd_is_und_section (symbol->section) |
| 601 | && (symbol->flags & BSF_WEAK) == 0) |
| 602 | return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined; |
| 603 | |
| 604 | /* If the sections are different, and we are doing a partial relocation, |
| 605 | just ignore it for now. */ |
| 606 | if (symbol->section->name != input_section->name |
| 607 | && output_bfd != (bfd *)NULL) |
| 608 | return bfd_reloc_continue; |
| 609 | |
| 610 | relocation = (target & 0x00ffffff) << 2; |
| 611 | relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */ |
| 612 | relocation += symbol->value; |
| 613 | relocation += symbol->section->output_section->vma; |
| 614 | relocation += symbol->section->output_offset; |
| 615 | relocation += reloc_entry->addend; |
| 616 | relocation -= input_section->output_section->vma; |
| 617 | relocation -= input_section->output_offset; |
| 618 | relocation -= addr; |
| 619 | |
| 620 | if (relocation & 3) |
| 621 | return bfd_reloc_overflow; |
| 622 | |
| 623 | /* Check for overflow. */ |
| 624 | if (relocation & 0x02000000) |
| 625 | { |
| 626 | if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff) |
| 627 | flag = bfd_reloc_overflow; |
| 628 | } |
| 629 | else if (relocation & ~(bfd_vma) 0x03ffffff) |
| 630 | flag = bfd_reloc_overflow; |
| 631 | |
| 632 | target &= ~0x00ffffff; |
| 633 | target |= (relocation >> 2) & 0x00ffffff; |
| 634 | bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr); |
| 635 | |
| 636 | /* Now the ARM magic... Change the reloc type so that it is marked as done. |
| 637 | Strictly this is only necessary if we are doing a partial relocation. */ |
| 638 | reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D]; |
| 639 | |
| 640 | return flag; |
| 641 | } |
| 642 | |
| 643 | static bfd_reloc_status_type |
| 644 | coff_thumb_pcrel_common (bfd *abfd, |
| 645 | arelent *reloc_entry, |
| 646 | asymbol *symbol, |
| 647 | void * data, |
| 648 | asection *input_section, |
| 649 | bfd *output_bfd, |
| 650 | char **error_message ATTRIBUTE_UNUSED, |
| 651 | thumb_pcrel_branchtype btype) |
| 652 | { |
| 653 | bfd_vma relocation = 0; |
| 654 | bfd_size_type addr = reloc_entry->address; |
| 655 | long target = bfd_get_32 (abfd, (bfd_byte *) data + addr); |
| 656 | bfd_reloc_status_type flag = bfd_reloc_ok; |
| 657 | bfd_vma dstmsk; |
| 658 | bfd_vma offmsk; |
| 659 | bfd_vma signbit; |
| 660 | |
| 661 | /* NOTE: This routine is currently used by GAS, but not by the link |
| 662 | phase. */ |
| 663 | switch (btype) |
| 664 | { |
| 665 | case b9: |
| 666 | dstmsk = 0x000000ff; |
| 667 | offmsk = 0x000001fe; |
| 668 | signbit = 0x00000100; |
| 669 | break; |
| 670 | |
| 671 | case b12: |
| 672 | dstmsk = 0x000007ff; |
| 673 | offmsk = 0x00000ffe; |
| 674 | signbit = 0x00000800; |
| 675 | break; |
| 676 | |
| 677 | case b23: |
| 678 | dstmsk = 0x07ff07ff; |
| 679 | offmsk = 0x007fffff; |
| 680 | signbit = 0x00400000; |
| 681 | break; |
| 682 | |
| 683 | default: |
| 684 | abort (); |
| 685 | } |
| 686 | |
| 687 | /* If this is an undefined symbol, return error. */ |
| 688 | if (bfd_is_und_section (symbol->section) |
| 689 | && (symbol->flags & BSF_WEAK) == 0) |
| 690 | return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined; |
| 691 | |
| 692 | /* If the sections are different, and we are doing a partial relocation, |
| 693 | just ignore it for now. */ |
| 694 | if (symbol->section->name != input_section->name |
| 695 | && output_bfd != (bfd *)NULL) |
| 696 | return bfd_reloc_continue; |
| 697 | |
| 698 | switch (btype) |
| 699 | { |
| 700 | case b9: |
| 701 | case b12: |
| 702 | relocation = ((target & dstmsk) << 1); |
| 703 | break; |
| 704 | |
| 705 | case b23: |
| 706 | if (bfd_big_endian (abfd)) |
| 707 | relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4); |
| 708 | else |
| 709 | relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15); |
| 710 | break; |
| 711 | |
| 712 | default: |
| 713 | abort (); |
| 714 | } |
| 715 | |
| 716 | relocation = (relocation ^ signbit) - signbit; /* Sign extend. */ |
| 717 | relocation += symbol->value; |
| 718 | relocation += symbol->section->output_section->vma; |
| 719 | relocation += symbol->section->output_offset; |
| 720 | relocation += reloc_entry->addend; |
| 721 | relocation -= input_section->output_section->vma; |
| 722 | relocation -= input_section->output_offset; |
| 723 | relocation -= addr; |
| 724 | |
| 725 | if (relocation & 1) |
| 726 | return bfd_reloc_overflow; |
| 727 | |
| 728 | /* Check for overflow. */ |
| 729 | if (relocation & signbit) |
| 730 | { |
| 731 | if ((relocation & ~offmsk) != ~offmsk) |
| 732 | flag = bfd_reloc_overflow; |
| 733 | } |
| 734 | else if (relocation & ~offmsk) |
| 735 | flag = bfd_reloc_overflow; |
| 736 | |
| 737 | target &= ~dstmsk; |
| 738 | switch (btype) |
| 739 | { |
| 740 | case b9: |
| 741 | case b12: |
| 742 | target |= (relocation >> 1); |
| 743 | break; |
| 744 | |
| 745 | case b23: |
| 746 | if (bfd_big_endian (abfd)) |
| 747 | target |= (((relocation & 0xfff) >> 1) |
| 748 | | ((relocation << 4) & 0x07ff0000)); |
| 749 | else |
| 750 | target |= (((relocation & 0xffe) << 15) |
| 751 | | ((relocation >> 12) & 0x7ff)); |
| 752 | break; |
| 753 | |
| 754 | default: |
| 755 | abort (); |
| 756 | } |
| 757 | |
| 758 | bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr); |
| 759 | |
| 760 | /* Now the ARM magic... Change the reloc type so that it is marked as done. |
| 761 | Strictly this is only necessary if we are doing a partial relocation. */ |
| 762 | reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D]; |
| 763 | |
| 764 | /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */ |
| 765 | return flag; |
| 766 | } |
| 767 | |
| 768 | #ifndef ARM_WINCE |
| 769 | static bfd_reloc_status_type |
| 770 | coff_thumb_pcrel_23 (bfd *abfd, |
| 771 | arelent *reloc_entry, |
| 772 | asymbol *symbol, |
| 773 | void * data, |
| 774 | asection *input_section, |
| 775 | bfd *output_bfd, |
| 776 | char **error_message) |
| 777 | { |
| 778 | return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, |
| 779 | input_section, output_bfd, error_message, |
| 780 | b23); |
| 781 | } |
| 782 | |
| 783 | static bfd_reloc_status_type |
| 784 | coff_thumb_pcrel_9 (bfd *abfd, |
| 785 | arelent *reloc_entry, |
| 786 | asymbol *symbol, |
| 787 | void * data, |
| 788 | asection *input_section, |
| 789 | bfd *output_bfd, |
| 790 | char **error_message) |
| 791 | { |
| 792 | return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, |
| 793 | input_section, output_bfd, error_message, |
| 794 | b9); |
| 795 | } |
| 796 | #endif /* not ARM_WINCE */ |
| 797 | |
| 798 | static bfd_reloc_status_type |
| 799 | coff_thumb_pcrel_12 (bfd *abfd, |
| 800 | arelent *reloc_entry, |
| 801 | asymbol *symbol, |
| 802 | void * data, |
| 803 | asection *input_section, |
| 804 | bfd *output_bfd, |
| 805 | char **error_message) |
| 806 | { |
| 807 | return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, |
| 808 | input_section, output_bfd, error_message, |
| 809 | b12); |
| 810 | } |
| 811 | |
| 812 | static const struct reloc_howto_struct * |
| 813 | coff_arm_reloc_type_lookup (bfd * abfd, bfd_reloc_code_real_type code) |
| 814 | { |
| 815 | #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j |
| 816 | |
| 817 | if (code == BFD_RELOC_CTOR) |
| 818 | switch (bfd_arch_bits_per_address (abfd)) |
| 819 | { |
| 820 | case 32: |
| 821 | code = BFD_RELOC_32; |
| 822 | break; |
| 823 | default: |
| 824 | return NULL; |
| 825 | } |
| 826 | |
| 827 | switch (code) |
| 828 | { |
| 829 | #ifdef ARM_WINCE |
| 830 | ASTD (BFD_RELOC_32, ARM_32); |
| 831 | ASTD (BFD_RELOC_RVA, ARM_RVA32); |
| 832 | ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26); |
| 833 | ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12); |
| 834 | ASTD (BFD_RELOC_32_SECREL, ARM_SECREL); |
| 835 | #else |
| 836 | ASTD (BFD_RELOC_8, ARM_8); |
| 837 | ASTD (BFD_RELOC_16, ARM_16); |
| 838 | ASTD (BFD_RELOC_32, ARM_32); |
| 839 | ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26); |
| 840 | ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26); |
| 841 | ASTD (BFD_RELOC_8_PCREL, ARM_DISP8); |
| 842 | ASTD (BFD_RELOC_16_PCREL, ARM_DISP16); |
| 843 | ASTD (BFD_RELOC_32_PCREL, ARM_DISP32); |
| 844 | ASTD (BFD_RELOC_RVA, ARM_RVA32); |
| 845 | ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9); |
| 846 | ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12); |
| 847 | ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23); |
| 848 | ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23); |
| 849 | #endif |
| 850 | default: return NULL; |
| 851 | } |
| 852 | } |
| 853 | |
| 854 | static reloc_howto_type * |
| 855 | coff_arm_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 856 | const char *r_name) |
| 857 | { |
| 858 | unsigned int i; |
| 859 | |
| 860 | for (i = 0; |
| 861 | i < (sizeof (aoutarm_std_reloc_howto) |
| 862 | / sizeof (aoutarm_std_reloc_howto[0])); |
| 863 | i++) |
| 864 | if (aoutarm_std_reloc_howto[i].name != NULL |
| 865 | && strcasecmp (aoutarm_std_reloc_howto[i].name, r_name) == 0) |
| 866 | return &aoutarm_std_reloc_howto[i]; |
| 867 | |
| 868 | return NULL; |
| 869 | } |
| 870 | |
| 871 | #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2 |
| 872 | #define COFF_PAGE_SIZE 0x1000 |
| 873 | |
| 874 | /* Turn a howto into a reloc nunmber. */ |
| 875 | #define SELECT_RELOC(x,howto) { x.r_type = howto->type; } |
| 876 | #define BADMAG(x) ARMBADMAG(x) |
| 877 | #define ARM 1 /* Customize coffcode.h. */ |
| 878 | |
| 879 | #ifndef ARM_WINCE |
| 880 | /* Make sure that the 'r_offset' field is copied properly |
| 881 | so that identical binaries will compare the same. */ |
| 882 | #define SWAP_IN_RELOC_OFFSET H_GET_32 |
| 883 | #define SWAP_OUT_RELOC_OFFSET H_PUT_32 |
| 884 | #endif |
| 885 | |
| 886 | /* Extend the coff_link_hash_table structure with a few ARM specific fields. |
| 887 | This allows us to store global data here without actually creating any |
| 888 | global variables, which is a no-no in the BFD world. */ |
| 889 | struct coff_arm_link_hash_table |
| 890 | { |
| 891 | /* The original coff_link_hash_table structure. MUST be first field. */ |
| 892 | struct coff_link_hash_table root; |
| 893 | |
| 894 | /* The size in bytes of the section containing the Thumb-to-ARM glue. */ |
| 895 | bfd_size_type thumb_glue_size; |
| 896 | |
| 897 | /* The size in bytes of the section containing the ARM-to-Thumb glue. */ |
| 898 | bfd_size_type arm_glue_size; |
| 899 | |
| 900 | /* An arbitrary input BFD chosen to hold the glue sections. */ |
| 901 | bfd * bfd_of_glue_owner; |
| 902 | |
| 903 | /* Support interworking with old, non-interworking aware ARM code. */ |
| 904 | int support_old_code; |
| 905 | }; |
| 906 | |
| 907 | /* Get the ARM coff linker hash table from a link_info structure. */ |
| 908 | #define coff_arm_hash_table(info) \ |
| 909 | ((struct coff_arm_link_hash_table *) ((info)->hash)) |
| 910 | |
| 911 | /* Create an ARM coff linker hash table. */ |
| 912 | |
| 913 | static struct bfd_link_hash_table * |
| 914 | coff_arm_link_hash_table_create (bfd * abfd) |
| 915 | { |
| 916 | struct coff_arm_link_hash_table * ret; |
| 917 | bfd_size_type amt = sizeof (struct coff_arm_link_hash_table); |
| 918 | |
| 919 | ret = bfd_zmalloc (amt); |
| 920 | if (ret == NULL) |
| 921 | return NULL; |
| 922 | |
| 923 | if (!_bfd_coff_link_hash_table_init (&ret->root, |
| 924 | abfd, |
| 925 | _bfd_coff_link_hash_newfunc, |
| 926 | sizeof (struct coff_link_hash_entry))) |
| 927 | { |
| 928 | free (ret); |
| 929 | return NULL; |
| 930 | } |
| 931 | |
| 932 | return & ret->root.root; |
| 933 | } |
| 934 | |
| 935 | static bfd_boolean |
| 936 | arm_emit_base_file_entry (struct bfd_link_info *info, |
| 937 | bfd *output_bfd, |
| 938 | asection *input_section, |
| 939 | bfd_vma reloc_offset) |
| 940 | { |
| 941 | bfd_vma addr = (reloc_offset |
| 942 | - input_section->vma |
| 943 | + input_section->output_offset |
| 944 | + input_section->output_section->vma); |
| 945 | |
| 946 | if (coff_data (output_bfd)->pe) |
| 947 | addr -= pe_data (output_bfd)->pe_opthdr.ImageBase; |
| 948 | if (fwrite (&addr, sizeof (addr), 1, (FILE *) info->base_file) == 1) |
| 949 | return TRUE; |
| 950 | |
| 951 | bfd_set_error (bfd_error_system_call); |
| 952 | return FALSE; |
| 953 | } |
| 954 | \f |
| 955 | #ifndef ARM_WINCE |
| 956 | /* The thumb form of a long branch is a bit finicky, because the offset |
| 957 | encoding is split over two fields, each in it's own instruction. They |
| 958 | can occur in any order. So given a thumb form of long branch, and an |
| 959 | offset, insert the offset into the thumb branch and return finished |
| 960 | instruction. |
| 961 | |
| 962 | It takes two thumb instructions to encode the target address. Each has |
| 963 | 11 bits to invest. The upper 11 bits are stored in one (identified by |
| 964 | H-0.. see below), the lower 11 bits are stored in the other (identified |
| 965 | by H-1). |
| 966 | |
| 967 | Combine together and shifted left by 1 (it's a half word address) and |
| 968 | there you have it. |
| 969 | |
| 970 | Op: 1111 = F, |
| 971 | H-0, upper address-0 = 000 |
| 972 | Op: 1111 = F, |
| 973 | H-1, lower address-0 = 800 |
| 974 | |
| 975 | They can be ordered either way, but the arm tools I've seen always put |
| 976 | the lower one first. It probably doesn't matter. krk@cygnus.com |
| 977 | |
| 978 | XXX: Actually the order does matter. The second instruction (H-1) |
| 979 | moves the computed address into the PC, so it must be the second one |
| 980 | in the sequence. The problem, however is that whilst little endian code |
| 981 | stores the instructions in HI then LOW order, big endian code does the |
| 982 | reverse. nickc@cygnus.com. */ |
| 983 | |
| 984 | #define LOW_HI_ORDER 0xF800F000 |
| 985 | #define HI_LOW_ORDER 0xF000F800 |
| 986 | |
| 987 | static insn32 |
| 988 | insert_thumb_branch (insn32 br_insn, int rel_off) |
| 989 | { |
| 990 | unsigned int low_bits; |
| 991 | unsigned int high_bits; |
| 992 | |
| 993 | BFD_ASSERT ((rel_off & 1) != 1); |
| 994 | |
| 995 | rel_off >>= 1; /* Half word aligned address. */ |
| 996 | low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */ |
| 997 | high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */ |
| 998 | |
| 999 | if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER) |
| 1000 | br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits; |
| 1001 | else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER) |
| 1002 | br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits; |
| 1003 | else |
| 1004 | /* FIXME: the BFD library should never abort except for internal errors |
| 1005 | - it should return an error status. */ |
| 1006 | abort (); /* Error - not a valid branch instruction form. */ |
| 1007 | |
| 1008 | return br_insn; |
| 1009 | } |
| 1010 | |
| 1011 | \f |
| 1012 | static struct coff_link_hash_entry * |
| 1013 | find_thumb_glue (struct bfd_link_info *info, |
| 1014 | const char *name, |
| 1015 | bfd *input_bfd) |
| 1016 | { |
| 1017 | char *tmp_name; |
| 1018 | struct coff_link_hash_entry *myh; |
| 1019 | bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1; |
| 1020 | |
| 1021 | tmp_name = bfd_malloc (amt); |
| 1022 | |
| 1023 | BFD_ASSERT (tmp_name); |
| 1024 | |
| 1025 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); |
| 1026 | |
| 1027 | myh = coff_link_hash_lookup |
| 1028 | (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE); |
| 1029 | |
| 1030 | if (myh == NULL) |
| 1031 | /* xgettext:c-format */ |
| 1032 | _bfd_error_handler (_("%B: unable to find THUMB glue '%s' for `%s'"), |
| 1033 | input_bfd, tmp_name, name); |
| 1034 | |
| 1035 | free (tmp_name); |
| 1036 | |
| 1037 | return myh; |
| 1038 | } |
| 1039 | #endif /* not ARM_WINCE */ |
| 1040 | |
| 1041 | static struct coff_link_hash_entry * |
| 1042 | find_arm_glue (struct bfd_link_info *info, |
| 1043 | const char *name, |
| 1044 | bfd *input_bfd) |
| 1045 | { |
| 1046 | char *tmp_name; |
| 1047 | struct coff_link_hash_entry * myh; |
| 1048 | bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1; |
| 1049 | |
| 1050 | tmp_name = bfd_malloc (amt); |
| 1051 | |
| 1052 | BFD_ASSERT (tmp_name); |
| 1053 | |
| 1054 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); |
| 1055 | |
| 1056 | myh = coff_link_hash_lookup |
| 1057 | (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE); |
| 1058 | |
| 1059 | if (myh == NULL) |
| 1060 | /* xgettext:c-format */ |
| 1061 | _bfd_error_handler (_("%B: unable to find ARM glue '%s' for `%s'"), |
| 1062 | input_bfd, tmp_name, name); |
| 1063 | |
| 1064 | free (tmp_name); |
| 1065 | |
| 1066 | return myh; |
| 1067 | } |
| 1068 | |
| 1069 | /* |
| 1070 | ARM->Thumb glue: |
| 1071 | |
| 1072 | .arm |
| 1073 | __func_from_arm: |
| 1074 | ldr r12, __func_addr |
| 1075 | bx r12 |
| 1076 | __func_addr: |
| 1077 | .word func @ behave as if you saw a ARM_32 reloc |
| 1078 | */ |
| 1079 | |
| 1080 | #define ARM2THUMB_GLUE_SIZE 12 |
| 1081 | static const insn32 a2t1_ldr_insn = 0xe59fc000; |
| 1082 | static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; |
| 1083 | static const insn32 a2t3_func_addr_insn = 0x00000001; |
| 1084 | |
| 1085 | /* |
| 1086 | Thumb->ARM: Thumb->(non-interworking aware) ARM |
| 1087 | |
| 1088 | .thumb .thumb |
| 1089 | .align 2 .align 2 |
| 1090 | __func_from_thumb: __func_from_thumb: |
| 1091 | bx pc push {r6, lr} |
| 1092 | nop ldr r6, __func_addr |
| 1093 | .arm mov lr, pc |
| 1094 | __func_change_to_arm: bx r6 |
| 1095 | b func .arm |
| 1096 | __func_back_to_thumb: |
| 1097 | ldmia r13! {r6, lr} |
| 1098 | bx lr |
| 1099 | __func_addr: |
| 1100 | .word func |
| 1101 | */ |
| 1102 | |
| 1103 | #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8) |
| 1104 | #ifndef ARM_WINCE |
| 1105 | static const insn16 t2a1_bx_pc_insn = 0x4778; |
| 1106 | static const insn16 t2a2_noop_insn = 0x46c0; |
| 1107 | static const insn32 t2a3_b_insn = 0xea000000; |
| 1108 | |
| 1109 | static const insn16 t2a1_push_insn = 0xb540; |
| 1110 | static const insn16 t2a2_ldr_insn = 0x4e03; |
| 1111 | static const insn16 t2a3_mov_insn = 0x46fe; |
| 1112 | static const insn16 t2a4_bx_insn = 0x4730; |
| 1113 | static const insn32 t2a5_pop_insn = 0xe8bd4040; |
| 1114 | static const insn32 t2a6_bx_insn = 0xe12fff1e; |
| 1115 | #endif |
| 1116 | |
| 1117 | /* TODO: |
| 1118 | We should really create new local (static) symbols in destination |
| 1119 | object for each stub we create. We should also create local |
| 1120 | (static) symbols within the stubs when switching between ARM and |
| 1121 | Thumb code. This will ensure that the debugger and disassembler |
| 1122 | can present a better view of stubs. |
| 1123 | |
| 1124 | We can treat stubs like literal sections, and for the THUMB9 ones |
| 1125 | (short addressing range) we should be able to insert the stubs |
| 1126 | between sections. i.e. the simplest approach (since relocations |
| 1127 | are done on a section basis) is to dump the stubs at the end of |
| 1128 | processing a section. That way we can always try and minimise the |
| 1129 | offset to and from a stub. However, this does not map well onto |
| 1130 | the way that the linker/BFD does its work: mapping all input |
| 1131 | sections to output sections via the linker script before doing |
| 1132 | all the processing. |
| 1133 | |
| 1134 | Unfortunately it may be easier to just to disallow short range |
| 1135 | Thumb->ARM stubs (i.e. no conditional inter-working branches, |
| 1136 | only branch-and-link (BL) calls. This will simplify the processing |
| 1137 | since we can then put all of the stubs into their own section. |
| 1138 | |
| 1139 | TODO: |
| 1140 | On a different subject, rather than complaining when a |
| 1141 | branch cannot fit in the number of bits available for the |
| 1142 | instruction we should generate a trampoline stub (needed to |
| 1143 | address the complete 32bit address space). */ |
| 1144 | |
| 1145 | /* The standard COFF backend linker does not cope with the special |
| 1146 | Thumb BRANCH23 relocation. The alternative would be to split the |
| 1147 | BRANCH23 into seperate HI23 and LO23 relocations. However, it is a |
| 1148 | bit simpler simply providing our own relocation driver. */ |
| 1149 | |
| 1150 | /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE: |
| 1151 | This code is a very slightly modified copy of |
| 1152 | _bfd_coff_generic_relocate_section. It would be a much more |
| 1153 | maintainable solution to have a MACRO that could be expanded within |
| 1154 | _bfd_coff_generic_relocate_section that would only be provided for |
| 1155 | ARM/Thumb builds. It is only the code marked THUMBEXTENSION that |
| 1156 | is different from the original. */ |
| 1157 | |
| 1158 | static bfd_boolean |
| 1159 | coff_arm_relocate_section (bfd *output_bfd, |
| 1160 | struct bfd_link_info *info, |
| 1161 | bfd *input_bfd, |
| 1162 | asection *input_section, |
| 1163 | bfd_byte *contents, |
| 1164 | struct internal_reloc *relocs, |
| 1165 | struct internal_syment *syms, |
| 1166 | asection **sections) |
| 1167 | { |
| 1168 | struct internal_reloc * rel; |
| 1169 | struct internal_reloc * relend; |
| 1170 | #ifndef ARM_WINCE |
| 1171 | bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section); |
| 1172 | #endif |
| 1173 | |
| 1174 | rel = relocs; |
| 1175 | relend = rel + input_section->reloc_count; |
| 1176 | |
| 1177 | for (; rel < relend; rel++) |
| 1178 | { |
| 1179 | int done = 0; |
| 1180 | long symndx; |
| 1181 | struct coff_link_hash_entry * h; |
| 1182 | struct internal_syment * sym; |
| 1183 | bfd_vma addend; |
| 1184 | bfd_vma val; |
| 1185 | reloc_howto_type * howto; |
| 1186 | bfd_reloc_status_type rstat; |
| 1187 | bfd_vma h_val; |
| 1188 | |
| 1189 | symndx = rel->r_symndx; |
| 1190 | |
| 1191 | if (symndx == -1) |
| 1192 | { |
| 1193 | h = NULL; |
| 1194 | sym = NULL; |
| 1195 | } |
| 1196 | else |
| 1197 | { |
| 1198 | h = obj_coff_sym_hashes (input_bfd)[symndx]; |
| 1199 | sym = syms + symndx; |
| 1200 | } |
| 1201 | |
| 1202 | /* COFF treats common symbols in one of two ways. Either the |
| 1203 | size of the symbol is included in the section contents, or it |
| 1204 | is not. We assume that the size is not included, and force |
| 1205 | the rtype_to_howto function to adjust the addend as needed. */ |
| 1206 | |
| 1207 | if (sym != NULL && sym->n_scnum != 0) |
| 1208 | addend = - sym->n_value; |
| 1209 | else |
| 1210 | addend = 0; |
| 1211 | |
| 1212 | howto = coff_rtype_to_howto (input_bfd, input_section, rel, h, |
| 1213 | sym, &addend); |
| 1214 | if (howto == NULL) |
| 1215 | return FALSE; |
| 1216 | |
| 1217 | /* The relocation_section function will skip pcrel_offset relocs |
| 1218 | when doing a relocatable link. However, we want to convert |
| 1219 | ARM_26 to ARM_26D relocs if possible. We return a fake howto in |
| 1220 | this case without pcrel_offset set, and adjust the addend to |
| 1221 | compensate. 'partial_inplace' is also set, since we want 'done' |
| 1222 | relocations to be reflected in section's data. */ |
| 1223 | if (rel->r_type == ARM_26 |
| 1224 | && h != NULL |
| 1225 | && bfd_link_relocatable (info) |
| 1226 | && (h->root.type == bfd_link_hash_defined |
| 1227 | || h->root.type == bfd_link_hash_defweak) |
| 1228 | && (h->root.u.def.section->output_section |
| 1229 | == input_section->output_section)) |
| 1230 | { |
| 1231 | static reloc_howto_type fake_arm26_reloc = |
| 1232 | HOWTO (ARM_26, |
| 1233 | 2, |
| 1234 | 2, |
| 1235 | 24, |
| 1236 | TRUE, |
| 1237 | 0, |
| 1238 | complain_overflow_signed, |
| 1239 | aoutarm_fix_pcrel_26 , |
| 1240 | "ARM_26", |
| 1241 | TRUE, |
| 1242 | 0x00ffffff, |
| 1243 | 0x00ffffff, |
| 1244 | FALSE); |
| 1245 | |
| 1246 | addend -= rel->r_vaddr - input_section->vma; |
| 1247 | #ifdef ARM_WINCE |
| 1248 | /* FIXME: I don't know why, but the hack is necessary for correct |
| 1249 | generation of bl's instruction offset. */ |
| 1250 | addend -= 8; |
| 1251 | #endif |
| 1252 | howto = & fake_arm26_reloc; |
| 1253 | } |
| 1254 | |
| 1255 | #ifdef ARM_WINCE |
| 1256 | /* MS ARM-CE makes the reloc relative to the opcode's pc, not |
| 1257 | the next opcode's pc, so is off by one. */ |
| 1258 | if (howto->pc_relative && !bfd_link_relocatable (info)) |
| 1259 | addend -= 8; |
| 1260 | #endif |
| 1261 | |
| 1262 | /* If we are doing a relocatable link, then we can just ignore |
| 1263 | a PC relative reloc that is pcrel_offset. It will already |
| 1264 | have the correct value. If this is not a relocatable link, |
| 1265 | then we should ignore the symbol value. */ |
| 1266 | if (howto->pc_relative && howto->pcrel_offset) |
| 1267 | { |
| 1268 | if (bfd_link_relocatable (info)) |
| 1269 | continue; |
| 1270 | /* FIXME - it is not clear which targets need this next test |
| 1271 | and which do not. It is known that it is needed for the |
| 1272 | VxWorks and EPOC-PE targets, but it is also known that it |
| 1273 | was suppressed for other ARM targets. This ought to be |
| 1274 | sorted out one day. */ |
| 1275 | #ifdef ARM_COFF_BUGFIX |
| 1276 | /* We must not ignore the symbol value. If the symbol is |
| 1277 | within the same section, the relocation should have already |
| 1278 | been fixed, but if it is not, we'll be handed a reloc into |
| 1279 | the beginning of the symbol's section, so we must not cancel |
| 1280 | out the symbol's value, otherwise we'll be adding it in |
| 1281 | twice. */ |
| 1282 | if (sym != NULL && sym->n_scnum != 0) |
| 1283 | addend += sym->n_value; |
| 1284 | #endif |
| 1285 | } |
| 1286 | |
| 1287 | val = 0; |
| 1288 | |
| 1289 | if (h == NULL) |
| 1290 | { |
| 1291 | asection *sec; |
| 1292 | |
| 1293 | if (symndx == -1) |
| 1294 | { |
| 1295 | sec = bfd_abs_section_ptr; |
| 1296 | val = 0; |
| 1297 | } |
| 1298 | else |
| 1299 | { |
| 1300 | sec = sections[symndx]; |
| 1301 | val = (sec->output_section->vma |
| 1302 | + sec->output_offset |
| 1303 | + sym->n_value |
| 1304 | - sec->vma); |
| 1305 | } |
| 1306 | } |
| 1307 | else |
| 1308 | { |
| 1309 | /* We don't output the stubs if we are generating a |
| 1310 | relocatable output file, since we may as well leave the |
| 1311 | stub generation to the final linker pass. If we fail to |
| 1312 | verify that the name is defined, we'll try to build stubs |
| 1313 | for an undefined name... */ |
| 1314 | if (! bfd_link_relocatable (info) |
| 1315 | && ( h->root.type == bfd_link_hash_defined |
| 1316 | || h->root.type == bfd_link_hash_defweak)) |
| 1317 | { |
| 1318 | asection * h_sec = h->root.u.def.section; |
| 1319 | const char * name = h->root.root.string; |
| 1320 | |
| 1321 | /* h locates the symbol referenced in the reloc. */ |
| 1322 | h_val = (h->root.u.def.value |
| 1323 | + h_sec->output_section->vma |
| 1324 | + h_sec->output_offset); |
| 1325 | |
| 1326 | if (howto->type == ARM_26) |
| 1327 | { |
| 1328 | if ( h->symbol_class == C_THUMBSTATFUNC |
| 1329 | || h->symbol_class == C_THUMBEXTFUNC) |
| 1330 | { |
| 1331 | /* Arm code calling a Thumb function. */ |
| 1332 | unsigned long int tmp; |
| 1333 | bfd_vma my_offset; |
| 1334 | asection * s; |
| 1335 | long int ret_offset; |
| 1336 | struct coff_link_hash_entry * myh; |
| 1337 | struct coff_arm_link_hash_table * globals; |
| 1338 | |
| 1339 | myh = find_arm_glue (info, name, input_bfd); |
| 1340 | if (myh == NULL) |
| 1341 | return FALSE; |
| 1342 | |
| 1343 | globals = coff_arm_hash_table (info); |
| 1344 | |
| 1345 | BFD_ASSERT (globals != NULL); |
| 1346 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1347 | |
| 1348 | my_offset = myh->root.u.def.value; |
| 1349 | |
| 1350 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, |
| 1351 | ARM2THUMB_GLUE_SECTION_NAME); |
| 1352 | BFD_ASSERT (s != NULL); |
| 1353 | BFD_ASSERT (s->contents != NULL); |
| 1354 | BFD_ASSERT (s->output_section != NULL); |
| 1355 | |
| 1356 | if ((my_offset & 0x01) == 0x01) |
| 1357 | { |
| 1358 | if (h_sec->owner != NULL |
| 1359 | && INTERWORK_SET (h_sec->owner) |
| 1360 | && ! INTERWORK_FLAG (h_sec->owner)) |
| 1361 | _bfd_error_handler |
| 1362 | /* xgettext:c-format */ |
| 1363 | (_("%B(%s): warning: interworking not enabled.\n" |
| 1364 | " first occurrence: %B: arm call to thumb"), |
| 1365 | h_sec->owner, input_bfd, name); |
| 1366 | |
| 1367 | --my_offset; |
| 1368 | myh->root.u.def.value = my_offset; |
| 1369 | |
| 1370 | bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn, |
| 1371 | s->contents + my_offset); |
| 1372 | |
| 1373 | bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn, |
| 1374 | s->contents + my_offset + 4); |
| 1375 | |
| 1376 | /* It's a thumb address. Add the low order bit. */ |
| 1377 | bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn, |
| 1378 | s->contents + my_offset + 8); |
| 1379 | |
| 1380 | if (info->base_file |
| 1381 | && !arm_emit_base_file_entry (info, output_bfd, |
| 1382 | s, my_offset + 8)) |
| 1383 | return FALSE; |
| 1384 | } |
| 1385 | |
| 1386 | BFD_ASSERT (my_offset <= globals->arm_glue_size); |
| 1387 | |
| 1388 | tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr |
| 1389 | - input_section->vma); |
| 1390 | |
| 1391 | tmp = tmp & 0xFF000000; |
| 1392 | |
| 1393 | /* Somehow these are both 4 too far, so subtract 8. */ |
| 1394 | ret_offset = |
| 1395 | s->output_offset |
| 1396 | + my_offset |
| 1397 | + s->output_section->vma |
| 1398 | - (input_section->output_offset |
| 1399 | + input_section->output_section->vma |
| 1400 | + rel->r_vaddr) |
| 1401 | - 8; |
| 1402 | |
| 1403 | tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); |
| 1404 | |
| 1405 | bfd_put_32 (output_bfd, (bfd_vma) tmp, |
| 1406 | contents + rel->r_vaddr - input_section->vma); |
| 1407 | done = 1; |
| 1408 | } |
| 1409 | } |
| 1410 | |
| 1411 | #ifndef ARM_WINCE |
| 1412 | /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */ |
| 1413 | else if (howto->type == ARM_THUMB23) |
| 1414 | { |
| 1415 | if ( h->symbol_class == C_EXT |
| 1416 | || h->symbol_class == C_STAT |
| 1417 | || h->symbol_class == C_LABEL) |
| 1418 | { |
| 1419 | /* Thumb code calling an ARM function. */ |
| 1420 | asection * s = 0; |
| 1421 | bfd_vma my_offset; |
| 1422 | unsigned long int tmp; |
| 1423 | long int ret_offset; |
| 1424 | struct coff_link_hash_entry * myh; |
| 1425 | struct coff_arm_link_hash_table * globals; |
| 1426 | |
| 1427 | myh = find_thumb_glue (info, name, input_bfd); |
| 1428 | if (myh == NULL) |
| 1429 | return FALSE; |
| 1430 | |
| 1431 | globals = coff_arm_hash_table (info); |
| 1432 | |
| 1433 | BFD_ASSERT (globals != NULL); |
| 1434 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1435 | |
| 1436 | my_offset = myh->root.u.def.value; |
| 1437 | |
| 1438 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, |
| 1439 | THUMB2ARM_GLUE_SECTION_NAME); |
| 1440 | |
| 1441 | BFD_ASSERT (s != NULL); |
| 1442 | BFD_ASSERT (s->contents != NULL); |
| 1443 | BFD_ASSERT (s->output_section != NULL); |
| 1444 | |
| 1445 | if ((my_offset & 0x01) == 0x01) |
| 1446 | { |
| 1447 | if (h_sec->owner != NULL |
| 1448 | && INTERWORK_SET (h_sec->owner) |
| 1449 | && ! INTERWORK_FLAG (h_sec->owner) |
| 1450 | && ! globals->support_old_code) |
| 1451 | _bfd_error_handler |
| 1452 | /* xgettext:c-format */ |
| 1453 | (_("%B(%s): warning: interworking not enabled.\n" |
| 1454 | " first occurrence: %B: thumb call to arm\n" |
| 1455 | " consider relinking with --support-old-code enabled"), |
| 1456 | h_sec->owner, input_bfd, name); |
| 1457 | |
| 1458 | -- my_offset; |
| 1459 | myh->root.u.def.value = my_offset; |
| 1460 | |
| 1461 | if (globals->support_old_code) |
| 1462 | { |
| 1463 | bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn, |
| 1464 | s->contents + my_offset); |
| 1465 | |
| 1466 | bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn, |
| 1467 | s->contents + my_offset + 2); |
| 1468 | |
| 1469 | bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn, |
| 1470 | s->contents + my_offset + 4); |
| 1471 | |
| 1472 | bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn, |
| 1473 | s->contents + my_offset + 6); |
| 1474 | |
| 1475 | bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn, |
| 1476 | s->contents + my_offset + 8); |
| 1477 | |
| 1478 | bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn, |
| 1479 | s->contents + my_offset + 12); |
| 1480 | |
| 1481 | /* Store the address of the function in the last word of the stub. */ |
| 1482 | bfd_put_32 (output_bfd, h_val, |
| 1483 | s->contents + my_offset + 16); |
| 1484 | |
| 1485 | if (info->base_file |
| 1486 | && !arm_emit_base_file_entry (info, |
| 1487 | output_bfd, s, |
| 1488 | my_offset + 16)) |
| 1489 | return FALSE; |
| 1490 | } |
| 1491 | else |
| 1492 | { |
| 1493 | bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn, |
| 1494 | s->contents + my_offset); |
| 1495 | |
| 1496 | bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn, |
| 1497 | s->contents + my_offset + 2); |
| 1498 | |
| 1499 | ret_offset = |
| 1500 | /* Address of destination of the stub. */ |
| 1501 | ((bfd_signed_vma) h_val) |
| 1502 | - ((bfd_signed_vma) |
| 1503 | /* Offset from the start of the current section to the start of the stubs. */ |
| 1504 | (s->output_offset |
| 1505 | /* Offset of the start of this stub from the start of the stubs. */ |
| 1506 | + my_offset |
| 1507 | /* Address of the start of the current section. */ |
| 1508 | + s->output_section->vma) |
| 1509 | /* The branch instruction is 4 bytes into the stub. */ |
| 1510 | + 4 |
| 1511 | /* ARM branches work from the pc of the instruction + 8. */ |
| 1512 | + 8); |
| 1513 | |
| 1514 | bfd_put_32 (output_bfd, |
| 1515 | (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), |
| 1516 | s->contents + my_offset + 4); |
| 1517 | |
| 1518 | } |
| 1519 | } |
| 1520 | |
| 1521 | BFD_ASSERT (my_offset <= globals->thumb_glue_size); |
| 1522 | |
| 1523 | /* Now go back and fix up the original BL insn to point |
| 1524 | to here. */ |
| 1525 | ret_offset = |
| 1526 | s->output_offset |
| 1527 | + my_offset |
| 1528 | - (input_section->output_offset |
| 1529 | + rel->r_vaddr) |
| 1530 | -4; |
| 1531 | |
| 1532 | tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr |
| 1533 | - input_section->vma); |
| 1534 | |
| 1535 | bfd_put_32 (output_bfd, |
| 1536 | (bfd_vma) insert_thumb_branch (tmp, |
| 1537 | ret_offset), |
| 1538 | contents + rel->r_vaddr - input_section->vma); |
| 1539 | |
| 1540 | done = 1; |
| 1541 | } |
| 1542 | } |
| 1543 | #endif |
| 1544 | } |
| 1545 | |
| 1546 | /* If the relocation type and destination symbol does not |
| 1547 | fall into one of the above categories, then we can just |
| 1548 | perform a direct link. */ |
| 1549 | |
| 1550 | if (done) |
| 1551 | rstat = bfd_reloc_ok; |
| 1552 | else |
| 1553 | if ( h->root.type == bfd_link_hash_defined |
| 1554 | || h->root.type == bfd_link_hash_defweak) |
| 1555 | { |
| 1556 | asection *sec; |
| 1557 | |
| 1558 | sec = h->root.u.def.section; |
| 1559 | val = (h->root.u.def.value |
| 1560 | + sec->output_section->vma |
| 1561 | + sec->output_offset); |
| 1562 | } |
| 1563 | |
| 1564 | else if (! bfd_link_relocatable (info)) |
| 1565 | (*info->callbacks->undefined_symbol) |
| 1566 | (info, h->root.root.string, input_bfd, input_section, |
| 1567 | rel->r_vaddr - input_section->vma, TRUE); |
| 1568 | } |
| 1569 | |
| 1570 | /* Emit a reloc if the backend thinks it needs it. */ |
| 1571 | if (info->base_file |
| 1572 | && sym |
| 1573 | && pe_data(output_bfd)->in_reloc_p(output_bfd, howto) |
| 1574 | && !arm_emit_base_file_entry (info, output_bfd, input_section, |
| 1575 | rel->r_vaddr)) |
| 1576 | return FALSE; |
| 1577 | |
| 1578 | if (done) |
| 1579 | rstat = bfd_reloc_ok; |
| 1580 | #ifndef ARM_WINCE |
| 1581 | /* Only perform this fix during the final link, not a relocatable link. */ |
| 1582 | else if (! bfd_link_relocatable (info) |
| 1583 | && howto->type == ARM_THUMB23) |
| 1584 | { |
| 1585 | /* This is pretty much a copy of what the default |
| 1586 | _bfd_final_link_relocate and _bfd_relocate_contents |
| 1587 | routines do to perform a relocation, with special |
| 1588 | processing for the split addressing of the Thumb BL |
| 1589 | instruction. Again, it would probably be simpler adding a |
| 1590 | ThumbBRANCH23 specific macro expansion into the default |
| 1591 | code. */ |
| 1592 | |
| 1593 | bfd_vma address = rel->r_vaddr - input_section->vma; |
| 1594 | |
| 1595 | if (address > high_address) |
| 1596 | rstat = bfd_reloc_outofrange; |
| 1597 | else |
| 1598 | { |
| 1599 | bfd_vma relocation = val + addend; |
| 1600 | int size = bfd_get_reloc_size (howto); |
| 1601 | bfd_boolean overflow = FALSE; |
| 1602 | bfd_byte *location = contents + address; |
| 1603 | bfd_vma x = bfd_get_32 (input_bfd, location); |
| 1604 | bfd_vma src_mask = 0x007FFFFE; |
| 1605 | bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; |
| 1606 | bfd_signed_vma reloc_signed_min = ~reloc_signed_max; |
| 1607 | bfd_vma check; |
| 1608 | bfd_signed_vma signed_check; |
| 1609 | bfd_vma add; |
| 1610 | bfd_signed_vma signed_add; |
| 1611 | |
| 1612 | BFD_ASSERT (size == 4); |
| 1613 | |
| 1614 | /* howto->pc_relative should be TRUE for type 14 BRANCH23. */ |
| 1615 | relocation -= (input_section->output_section->vma |
| 1616 | + input_section->output_offset); |
| 1617 | |
| 1618 | /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */ |
| 1619 | relocation -= address; |
| 1620 | |
| 1621 | /* No need to negate the relocation with BRANCH23. */ |
| 1622 | /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */ |
| 1623 | /* howto->rightshift == 1 */ |
| 1624 | |
| 1625 | /* Drop unwanted bits from the value we are relocating to. */ |
| 1626 | check = relocation >> howto->rightshift; |
| 1627 | |
| 1628 | /* If this is a signed value, the rightshift just dropped |
| 1629 | leading 1 bits (assuming twos complement). */ |
| 1630 | if ((bfd_signed_vma) relocation >= 0) |
| 1631 | signed_check = check; |
| 1632 | else |
| 1633 | signed_check = (check |
| 1634 | | ((bfd_vma) - 1 |
| 1635 | & ~((bfd_vma) - 1 >> howto->rightshift))); |
| 1636 | |
| 1637 | /* Get the value from the object file. */ |
| 1638 | if (bfd_big_endian (input_bfd)) |
| 1639 | add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1); |
| 1640 | else |
| 1641 | add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15)); |
| 1642 | |
| 1643 | /* Get the value from the object file with an appropriate sign. |
| 1644 | The expression involving howto->src_mask isolates the upper |
| 1645 | bit of src_mask. If that bit is set in the value we are |
| 1646 | adding, it is negative, and we subtract out that number times |
| 1647 | two. If src_mask includes the highest possible bit, then we |
| 1648 | can not get the upper bit, but that does not matter since |
| 1649 | signed_add needs no adjustment to become negative in that |
| 1650 | case. */ |
| 1651 | signed_add = add; |
| 1652 | |
| 1653 | if ((add & (((~ src_mask) >> 1) & src_mask)) != 0) |
| 1654 | signed_add -= (((~ src_mask) >> 1) & src_mask) << 1; |
| 1655 | |
| 1656 | /* howto->bitpos == 0 */ |
| 1657 | /* Add the value from the object file, shifted so that it is a |
| 1658 | straight number. */ |
| 1659 | signed_check += signed_add; |
| 1660 | relocation += signed_add; |
| 1661 | |
| 1662 | BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed); |
| 1663 | |
| 1664 | /* Assumes two's complement. */ |
| 1665 | if ( signed_check > reloc_signed_max |
| 1666 | || signed_check < reloc_signed_min) |
| 1667 | overflow = TRUE; |
| 1668 | |
| 1669 | /* Put the relocation into the correct bits. |
| 1670 | For a BLX instruction, make sure that the relocation is rounded up |
| 1671 | to a word boundary. This follows the semantics of the instruction |
| 1672 | which specifies that bit 1 of the target address will come from bit |
| 1673 | 1 of the base address. */ |
| 1674 | if (bfd_big_endian (input_bfd)) |
| 1675 | { |
| 1676 | if ((x & 0x1800) == 0x0800 && (relocation & 0x02)) |
| 1677 | relocation += 2; |
| 1678 | relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000)); |
| 1679 | } |
| 1680 | else |
| 1681 | { |
| 1682 | if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02)) |
| 1683 | relocation += 2; |
| 1684 | relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff)); |
| 1685 | } |
| 1686 | |
| 1687 | /* Add the relocation to the correct bits of X. */ |
| 1688 | x = ((x & ~howto->dst_mask) | relocation); |
| 1689 | |
| 1690 | /* Put the relocated value back in the object file. */ |
| 1691 | bfd_put_32 (input_bfd, x, location); |
| 1692 | |
| 1693 | rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok; |
| 1694 | } |
| 1695 | } |
| 1696 | #endif |
| 1697 | else |
| 1698 | if (bfd_link_relocatable (info) && ! howto->partial_inplace) |
| 1699 | rstat = bfd_reloc_ok; |
| 1700 | else |
| 1701 | rstat = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1702 | contents, |
| 1703 | rel->r_vaddr - input_section->vma, |
| 1704 | val, addend); |
| 1705 | /* Only perform this fix during the final link, not a relocatable link. */ |
| 1706 | if (! bfd_link_relocatable (info) |
| 1707 | && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32)) |
| 1708 | { |
| 1709 | /* Determine if we need to set the bottom bit of a relocated address |
| 1710 | because the address is the address of a Thumb code symbol. */ |
| 1711 | int patchit = FALSE; |
| 1712 | |
| 1713 | if (h != NULL |
| 1714 | && ( h->symbol_class == C_THUMBSTATFUNC |
| 1715 | || h->symbol_class == C_THUMBEXTFUNC)) |
| 1716 | { |
| 1717 | patchit = TRUE; |
| 1718 | } |
| 1719 | else if (sym != NULL |
| 1720 | && sym->n_scnum > N_UNDEF) |
| 1721 | { |
| 1722 | /* No hash entry - use the symbol instead. */ |
| 1723 | if ( sym->n_sclass == C_THUMBSTATFUNC |
| 1724 | || sym->n_sclass == C_THUMBEXTFUNC) |
| 1725 | patchit = TRUE; |
| 1726 | } |
| 1727 | |
| 1728 | if (patchit) |
| 1729 | { |
| 1730 | bfd_byte * location = contents + rel->r_vaddr - input_section->vma; |
| 1731 | bfd_vma x = bfd_get_32 (input_bfd, location); |
| 1732 | |
| 1733 | bfd_put_32 (input_bfd, x | 1, location); |
| 1734 | } |
| 1735 | } |
| 1736 | |
| 1737 | switch (rstat) |
| 1738 | { |
| 1739 | default: |
| 1740 | abort (); |
| 1741 | case bfd_reloc_ok: |
| 1742 | break; |
| 1743 | case bfd_reloc_outofrange: |
| 1744 | _bfd_error_handler |
| 1745 | /* xgettext:c-format */ |
| 1746 | (_("%B: bad reloc address 0x%lx in section `%A'"), |
| 1747 | input_bfd, input_section, (unsigned long) rel->r_vaddr); |
| 1748 | return FALSE; |
| 1749 | case bfd_reloc_overflow: |
| 1750 | { |
| 1751 | const char *name; |
| 1752 | char buf[SYMNMLEN + 1]; |
| 1753 | |
| 1754 | if (symndx == -1) |
| 1755 | name = "*ABS*"; |
| 1756 | else if (h != NULL) |
| 1757 | name = NULL; |
| 1758 | else |
| 1759 | { |
| 1760 | name = _bfd_coff_internal_syment_name (input_bfd, sym, buf); |
| 1761 | if (name == NULL) |
| 1762 | return FALSE; |
| 1763 | } |
| 1764 | |
| 1765 | (*info->callbacks->reloc_overflow) |
| 1766 | (info, (h ? &h->root : NULL), name, howto->name, |
| 1767 | (bfd_vma) 0, input_bfd, input_section, |
| 1768 | rel->r_vaddr - input_section->vma); |
| 1769 | } |
| 1770 | } |
| 1771 | } |
| 1772 | |
| 1773 | return TRUE; |
| 1774 | } |
| 1775 | |
| 1776 | #ifndef COFF_IMAGE_WITH_PE |
| 1777 | |
| 1778 | bfd_boolean |
| 1779 | bfd_arm_allocate_interworking_sections (struct bfd_link_info * info) |
| 1780 | { |
| 1781 | asection * s; |
| 1782 | bfd_byte * foo; |
| 1783 | struct coff_arm_link_hash_table * globals; |
| 1784 | |
| 1785 | globals = coff_arm_hash_table (info); |
| 1786 | |
| 1787 | BFD_ASSERT (globals != NULL); |
| 1788 | |
| 1789 | if (globals->arm_glue_size != 0) |
| 1790 | { |
| 1791 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1792 | |
| 1793 | s = bfd_get_section_by_name |
| 1794 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); |
| 1795 | |
| 1796 | BFD_ASSERT (s != NULL); |
| 1797 | |
| 1798 | foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size); |
| 1799 | |
| 1800 | s->size = globals->arm_glue_size; |
| 1801 | s->contents = foo; |
| 1802 | } |
| 1803 | |
| 1804 | if (globals->thumb_glue_size != 0) |
| 1805 | { |
| 1806 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1807 | |
| 1808 | s = bfd_get_section_by_name |
| 1809 | (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); |
| 1810 | |
| 1811 | BFD_ASSERT (s != NULL); |
| 1812 | |
| 1813 | foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size); |
| 1814 | |
| 1815 | s->size = globals->thumb_glue_size; |
| 1816 | s->contents = foo; |
| 1817 | } |
| 1818 | |
| 1819 | return TRUE; |
| 1820 | } |
| 1821 | |
| 1822 | static void |
| 1823 | record_arm_to_thumb_glue (struct bfd_link_info * info, |
| 1824 | struct coff_link_hash_entry * h) |
| 1825 | { |
| 1826 | const char * name = h->root.root.string; |
| 1827 | register asection * s; |
| 1828 | char * tmp_name; |
| 1829 | struct coff_link_hash_entry * myh; |
| 1830 | struct bfd_link_hash_entry * bh; |
| 1831 | struct coff_arm_link_hash_table * globals; |
| 1832 | bfd_vma val; |
| 1833 | bfd_size_type amt; |
| 1834 | |
| 1835 | globals = coff_arm_hash_table (info); |
| 1836 | |
| 1837 | BFD_ASSERT (globals != NULL); |
| 1838 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1839 | |
| 1840 | s = bfd_get_section_by_name |
| 1841 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); |
| 1842 | |
| 1843 | BFD_ASSERT (s != NULL); |
| 1844 | |
| 1845 | amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1; |
| 1846 | tmp_name = bfd_malloc (amt); |
| 1847 | |
| 1848 | BFD_ASSERT (tmp_name); |
| 1849 | |
| 1850 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); |
| 1851 | |
| 1852 | myh = coff_link_hash_lookup |
| 1853 | (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE); |
| 1854 | |
| 1855 | if (myh != NULL) |
| 1856 | { |
| 1857 | free (tmp_name); |
| 1858 | /* We've already seen this guy. */ |
| 1859 | return; |
| 1860 | } |
| 1861 | |
| 1862 | /* The only trick here is using globals->arm_glue_size as the value. Even |
| 1863 | though the section isn't allocated yet, this is where we will be putting |
| 1864 | it. */ |
| 1865 | bh = NULL; |
| 1866 | val = globals->arm_glue_size + 1; |
| 1867 | bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name, |
| 1868 | BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh); |
| 1869 | |
| 1870 | free (tmp_name); |
| 1871 | |
| 1872 | globals->arm_glue_size += ARM2THUMB_GLUE_SIZE; |
| 1873 | |
| 1874 | return; |
| 1875 | } |
| 1876 | |
| 1877 | #ifndef ARM_WINCE |
| 1878 | static void |
| 1879 | record_thumb_to_arm_glue (struct bfd_link_info * info, |
| 1880 | struct coff_link_hash_entry * h) |
| 1881 | { |
| 1882 | const char * name = h->root.root.string; |
| 1883 | asection * s; |
| 1884 | char * tmp_name; |
| 1885 | struct coff_link_hash_entry * myh; |
| 1886 | struct bfd_link_hash_entry * bh; |
| 1887 | struct coff_arm_link_hash_table * globals; |
| 1888 | bfd_vma val; |
| 1889 | bfd_size_type amt; |
| 1890 | |
| 1891 | globals = coff_arm_hash_table (info); |
| 1892 | |
| 1893 | BFD_ASSERT (globals != NULL); |
| 1894 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1895 | |
| 1896 | s = bfd_get_section_by_name |
| 1897 | (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); |
| 1898 | |
| 1899 | BFD_ASSERT (s != NULL); |
| 1900 | |
| 1901 | amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1; |
| 1902 | tmp_name = bfd_malloc (amt); |
| 1903 | |
| 1904 | BFD_ASSERT (tmp_name); |
| 1905 | |
| 1906 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); |
| 1907 | |
| 1908 | myh = coff_link_hash_lookup |
| 1909 | (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE); |
| 1910 | |
| 1911 | if (myh != NULL) |
| 1912 | { |
| 1913 | free (tmp_name); |
| 1914 | /* We've already seen this guy. */ |
| 1915 | return; |
| 1916 | } |
| 1917 | |
| 1918 | bh = NULL; |
| 1919 | val = globals->thumb_glue_size + 1; |
| 1920 | bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name, |
| 1921 | BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh); |
| 1922 | |
| 1923 | /* If we mark it 'thumb', the disassembler will do a better job. */ |
| 1924 | myh = (struct coff_link_hash_entry *) bh; |
| 1925 | myh->symbol_class = C_THUMBEXTFUNC; |
| 1926 | |
| 1927 | free (tmp_name); |
| 1928 | |
| 1929 | /* Allocate another symbol to mark where we switch to arm mode. */ |
| 1930 | |
| 1931 | #define CHANGE_TO_ARM "__%s_change_to_arm" |
| 1932 | #define BACK_FROM_ARM "__%s_back_from_arm" |
| 1933 | |
| 1934 | amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1; |
| 1935 | tmp_name = bfd_malloc (amt); |
| 1936 | |
| 1937 | BFD_ASSERT (tmp_name); |
| 1938 | |
| 1939 | sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name); |
| 1940 | |
| 1941 | bh = NULL; |
| 1942 | val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4); |
| 1943 | bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name, |
| 1944 | BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh); |
| 1945 | |
| 1946 | free (tmp_name); |
| 1947 | |
| 1948 | globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE; |
| 1949 | |
| 1950 | return; |
| 1951 | } |
| 1952 | #endif /* not ARM_WINCE */ |
| 1953 | |
| 1954 | /* Select a BFD to be used to hold the sections used by the glue code. |
| 1955 | This function is called from the linker scripts in ld/emultempl/ |
| 1956 | {armcoff/pe}.em */ |
| 1957 | |
| 1958 | bfd_boolean |
| 1959 | bfd_arm_get_bfd_for_interworking (bfd * abfd, |
| 1960 | struct bfd_link_info * info) |
| 1961 | { |
| 1962 | struct coff_arm_link_hash_table * globals; |
| 1963 | flagword flags; |
| 1964 | asection * sec; |
| 1965 | |
| 1966 | /* If we are only performing a partial link do not bother |
| 1967 | getting a bfd to hold the glue. */ |
| 1968 | if (bfd_link_relocatable (info)) |
| 1969 | return TRUE; |
| 1970 | |
| 1971 | globals = coff_arm_hash_table (info); |
| 1972 | |
| 1973 | BFD_ASSERT (globals != NULL); |
| 1974 | |
| 1975 | if (globals->bfd_of_glue_owner != NULL) |
| 1976 | return TRUE; |
| 1977 | |
| 1978 | sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); |
| 1979 | |
| 1980 | if (sec == NULL) |
| 1981 | { |
| 1982 | flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY |
| 1983 | | SEC_CODE | SEC_READONLY); |
| 1984 | sec = bfd_make_section_with_flags (abfd, ARM2THUMB_GLUE_SECTION_NAME, |
| 1985 | flags); |
| 1986 | if (sec == NULL |
| 1987 | || ! bfd_set_section_alignment (abfd, sec, 2)) |
| 1988 | return FALSE; |
| 1989 | } |
| 1990 | |
| 1991 | sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME); |
| 1992 | |
| 1993 | if (sec == NULL) |
| 1994 | { |
| 1995 | flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY |
| 1996 | | SEC_CODE | SEC_READONLY); |
| 1997 | sec = bfd_make_section_with_flags (abfd, THUMB2ARM_GLUE_SECTION_NAME, |
| 1998 | flags); |
| 1999 | |
| 2000 | if (sec == NULL |
| 2001 | || ! bfd_set_section_alignment (abfd, sec, 2)) |
| 2002 | return FALSE; |
| 2003 | } |
| 2004 | |
| 2005 | /* Save the bfd for later use. */ |
| 2006 | globals->bfd_of_glue_owner = abfd; |
| 2007 | |
| 2008 | return TRUE; |
| 2009 | } |
| 2010 | |
| 2011 | bfd_boolean |
| 2012 | bfd_arm_process_before_allocation (bfd * abfd, |
| 2013 | struct bfd_link_info * info, |
| 2014 | int support_old_code) |
| 2015 | { |
| 2016 | asection * sec; |
| 2017 | struct coff_arm_link_hash_table * globals; |
| 2018 | |
| 2019 | /* If we are only performing a partial link do not bother |
| 2020 | to construct any glue. */ |
| 2021 | if (bfd_link_relocatable (info)) |
| 2022 | return TRUE; |
| 2023 | |
| 2024 | /* Here we have a bfd that is to be included on the link. We have a hook |
| 2025 | to do reloc rummaging, before section sizes are nailed down. */ |
| 2026 | _bfd_coff_get_external_symbols (abfd); |
| 2027 | |
| 2028 | globals = coff_arm_hash_table (info); |
| 2029 | |
| 2030 | BFD_ASSERT (globals != NULL); |
| 2031 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 2032 | |
| 2033 | globals->support_old_code = support_old_code; |
| 2034 | |
| 2035 | /* Rummage around all the relocs and map the glue vectors. */ |
| 2036 | sec = abfd->sections; |
| 2037 | |
| 2038 | if (sec == NULL) |
| 2039 | return TRUE; |
| 2040 | |
| 2041 | for (; sec != NULL; sec = sec->next) |
| 2042 | { |
| 2043 | struct internal_reloc * i; |
| 2044 | struct internal_reloc * rel; |
| 2045 | |
| 2046 | if (sec->reloc_count == 0) |
| 2047 | continue; |
| 2048 | |
| 2049 | /* Load the relocs. */ |
| 2050 | /* FIXME: there may be a storage leak here. */ |
| 2051 | i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0); |
| 2052 | |
| 2053 | BFD_ASSERT (i != 0); |
| 2054 | |
| 2055 | for (rel = i; rel < i + sec->reloc_count; ++rel) |
| 2056 | { |
| 2057 | unsigned short r_type = rel->r_type; |
| 2058 | long symndx; |
| 2059 | struct coff_link_hash_entry * h; |
| 2060 | |
| 2061 | symndx = rel->r_symndx; |
| 2062 | |
| 2063 | /* If the relocation is not against a symbol it cannot concern us. */ |
| 2064 | if (symndx == -1) |
| 2065 | continue; |
| 2066 | |
| 2067 | /* If the index is outside of the range of our table, something has gone wrong. */ |
| 2068 | if (symndx >= obj_conv_table_size (abfd)) |
| 2069 | { |
| 2070 | /* xgettext:c-format */ |
| 2071 | _bfd_error_handler (_("%B: illegal symbol index in reloc: %d"), |
| 2072 | abfd, symndx); |
| 2073 | continue; |
| 2074 | } |
| 2075 | |
| 2076 | h = obj_coff_sym_hashes (abfd)[symndx]; |
| 2077 | |
| 2078 | /* If the relocation is against a static symbol it must be within |
| 2079 | the current section and so cannot be a cross ARM/Thumb relocation. */ |
| 2080 | if (h == NULL) |
| 2081 | continue; |
| 2082 | |
| 2083 | switch (r_type) |
| 2084 | { |
| 2085 | case ARM_26: |
| 2086 | /* This one is a call from arm code. We need to look up |
| 2087 | the target of the call. If it is a thumb target, we |
| 2088 | insert glue. */ |
| 2089 | |
| 2090 | if (h->symbol_class == C_THUMBEXTFUNC) |
| 2091 | record_arm_to_thumb_glue (info, h); |
| 2092 | break; |
| 2093 | |
| 2094 | #ifndef ARM_WINCE |
| 2095 | case ARM_THUMB23: |
| 2096 | /* This one is a call from thumb code. We used to look |
| 2097 | for ARM_THUMB9 and ARM_THUMB12 as well. We need to look |
| 2098 | up the target of the call. If it is an arm target, we |
| 2099 | insert glue. If the symbol does not exist it will be |
| 2100 | given a class of C_EXT and so we will generate a stub |
| 2101 | for it. This is not really a problem, since the link |
| 2102 | is doomed anyway. */ |
| 2103 | |
| 2104 | switch (h->symbol_class) |
| 2105 | { |
| 2106 | case C_EXT: |
| 2107 | case C_STAT: |
| 2108 | case C_LABEL: |
| 2109 | record_thumb_to_arm_glue (info, h); |
| 2110 | break; |
| 2111 | default: |
| 2112 | ; |
| 2113 | } |
| 2114 | break; |
| 2115 | #endif |
| 2116 | |
| 2117 | default: |
| 2118 | break; |
| 2119 | } |
| 2120 | } |
| 2121 | } |
| 2122 | |
| 2123 | return TRUE; |
| 2124 | } |
| 2125 | |
| 2126 | #endif /* ! defined (COFF_IMAGE_WITH_PE) */ |
| 2127 | |
| 2128 | #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup |
| 2129 | #define coff_bfd_reloc_name_lookup coff_arm_reloc_name_lookup |
| 2130 | #define coff_relocate_section coff_arm_relocate_section |
| 2131 | #define coff_bfd_is_local_label_name coff_arm_is_local_label_name |
| 2132 | #define coff_adjust_symndx coff_arm_adjust_symndx |
| 2133 | #define coff_link_output_has_begun coff_arm_link_output_has_begun |
| 2134 | #define coff_final_link_postscript coff_arm_final_link_postscript |
| 2135 | #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data |
| 2136 | #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data |
| 2137 | #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags |
| 2138 | #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data |
| 2139 | #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create |
| 2140 | |
| 2141 | /* When doing a relocatable link, we want to convert ARM_26 relocs |
| 2142 | into ARM_26D relocs. */ |
| 2143 | |
| 2144 | static bfd_boolean |
| 2145 | coff_arm_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED, |
| 2146 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 2147 | bfd *ibfd, |
| 2148 | asection *sec, |
| 2149 | struct internal_reloc *irel, |
| 2150 | bfd_boolean *adjustedp) |
| 2151 | { |
| 2152 | if (irel->r_type == ARM_26) |
| 2153 | { |
| 2154 | struct coff_link_hash_entry *h; |
| 2155 | |
| 2156 | h = obj_coff_sym_hashes (ibfd)[irel->r_symndx]; |
| 2157 | if (h != NULL |
| 2158 | && (h->root.type == bfd_link_hash_defined |
| 2159 | || h->root.type == bfd_link_hash_defweak) |
| 2160 | && h->root.u.def.section->output_section == sec->output_section) |
| 2161 | irel->r_type = ARM_26D; |
| 2162 | } |
| 2163 | *adjustedp = FALSE; |
| 2164 | return TRUE; |
| 2165 | } |
| 2166 | |
| 2167 | /* Called when merging the private data areas of two BFDs. |
| 2168 | This is important as it allows us to detect if we are |
| 2169 | attempting to merge binaries compiled for different ARM |
| 2170 | targets, eg different CPUs or different APCS's. */ |
| 2171 | |
| 2172 | static bfd_boolean |
| 2173 | coff_arm_merge_private_bfd_data (bfd * ibfd, struct bfd_link_info *info) |
| 2174 | { |
| 2175 | bfd *obfd = info->output_bfd; |
| 2176 | BFD_ASSERT (ibfd != NULL && obfd != NULL); |
| 2177 | |
| 2178 | if (ibfd == obfd) |
| 2179 | return TRUE; |
| 2180 | |
| 2181 | /* If the two formats are different we cannot merge anything. |
| 2182 | This is not an error, since it is permissable to change the |
| 2183 | input and output formats. */ |
| 2184 | if ( ibfd->xvec->flavour != bfd_target_coff_flavour |
| 2185 | || obfd->xvec->flavour != bfd_target_coff_flavour) |
| 2186 | return TRUE; |
| 2187 | |
| 2188 | /* Determine what should happen if the input ARM architecture |
| 2189 | does not match the output ARM architecture. */ |
| 2190 | if (! bfd_arm_merge_machines (ibfd, obfd)) |
| 2191 | return FALSE; |
| 2192 | |
| 2193 | /* Verify that the APCS is the same for the two BFDs. */ |
| 2194 | if (APCS_SET (ibfd)) |
| 2195 | { |
| 2196 | if (APCS_SET (obfd)) |
| 2197 | { |
| 2198 | /* If the src and dest have different APCS flag bits set, fail. */ |
| 2199 | if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd)) |
| 2200 | { |
| 2201 | _bfd_error_handler |
| 2202 | /* xgettext: c-format */ |
| 2203 | (_("error: %B is compiled for APCS-%d, whereas %B is compiled for APCS-%d"), |
| 2204 | ibfd, obfd, |
| 2205 | APCS_26_FLAG (ibfd) ? 26 : 32, |
| 2206 | APCS_26_FLAG (obfd) ? 26 : 32 |
| 2207 | ); |
| 2208 | |
| 2209 | bfd_set_error (bfd_error_wrong_format); |
| 2210 | return FALSE; |
| 2211 | } |
| 2212 | |
| 2213 | if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd)) |
| 2214 | { |
| 2215 | if (APCS_FLOAT_FLAG (ibfd)) |
| 2216 | /* xgettext: c-format */ |
| 2217 | _bfd_error_handler (_("\ |
| 2218 | error: %B passes floats in float registers, whereas %B passes them in integer registers"), |
| 2219 | ibfd, obfd); |
| 2220 | else |
| 2221 | /* xgettext: c-format */ |
| 2222 | _bfd_error_handler (_("\ |
| 2223 | error: %B passes floats in integer registers, whereas %B passes them in float registers"), |
| 2224 | ibfd, obfd); |
| 2225 | |
| 2226 | bfd_set_error (bfd_error_wrong_format); |
| 2227 | return FALSE; |
| 2228 | } |
| 2229 | |
| 2230 | if (PIC_FLAG (obfd) != PIC_FLAG (ibfd)) |
| 2231 | { |
| 2232 | if (PIC_FLAG (ibfd)) |
| 2233 | /* xgettext: c-format */ |
| 2234 | _bfd_error_handler (_("\ |
| 2235 | error: %B is compiled as position independent code, whereas target %B is absolute position"), |
| 2236 | ibfd, obfd); |
| 2237 | else |
| 2238 | /* xgettext: c-format */ |
| 2239 | _bfd_error_handler (_("\ |
| 2240 | error: %B is compiled as absolute position code, whereas target %B is position independent"), |
| 2241 | ibfd, obfd); |
| 2242 | |
| 2243 | bfd_set_error (bfd_error_wrong_format); |
| 2244 | return FALSE; |
| 2245 | } |
| 2246 | } |
| 2247 | else |
| 2248 | { |
| 2249 | SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd)); |
| 2250 | |
| 2251 | /* Set up the arch and fields as well as these are probably wrong. */ |
| 2252 | bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); |
| 2253 | } |
| 2254 | } |
| 2255 | |
| 2256 | /* Check the interworking support. */ |
| 2257 | if (INTERWORK_SET (ibfd)) |
| 2258 | { |
| 2259 | if (INTERWORK_SET (obfd)) |
| 2260 | { |
| 2261 | /* If the src and dest differ in their interworking issue a warning. */ |
| 2262 | if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd)) |
| 2263 | { |
| 2264 | if (INTERWORK_FLAG (ibfd)) |
| 2265 | /* xgettext: c-format */ |
| 2266 | _bfd_error_handler (_("\ |
| 2267 | Warning: %B supports interworking, whereas %B does not"), |
| 2268 | ibfd, obfd); |
| 2269 | else |
| 2270 | /* xgettext: c-format */ |
| 2271 | _bfd_error_handler (_("\ |
| 2272 | Warning: %B does not support interworking, whereas %B does"), |
| 2273 | ibfd, obfd); |
| 2274 | } |
| 2275 | } |
| 2276 | else |
| 2277 | { |
| 2278 | SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd)); |
| 2279 | } |
| 2280 | } |
| 2281 | |
| 2282 | return TRUE; |
| 2283 | } |
| 2284 | |
| 2285 | /* Display the flags field. */ |
| 2286 | |
| 2287 | static bfd_boolean |
| 2288 | coff_arm_print_private_bfd_data (bfd * abfd, void * ptr) |
| 2289 | { |
| 2290 | FILE * file = (FILE *) ptr; |
| 2291 | |
| 2292 | BFD_ASSERT (abfd != NULL && ptr != NULL); |
| 2293 | |
| 2294 | fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags); |
| 2295 | |
| 2296 | if (APCS_SET (abfd)) |
| 2297 | { |
| 2298 | /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */ |
| 2299 | fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32); |
| 2300 | |
| 2301 | if (APCS_FLOAT_FLAG (abfd)) |
| 2302 | fprintf (file, _(" [floats passed in float registers]")); |
| 2303 | else |
| 2304 | fprintf (file, _(" [floats passed in integer registers]")); |
| 2305 | |
| 2306 | if (PIC_FLAG (abfd)) |
| 2307 | fprintf (file, _(" [position independent]")); |
| 2308 | else |
| 2309 | fprintf (file, _(" [absolute position]")); |
| 2310 | } |
| 2311 | |
| 2312 | if (! INTERWORK_SET (abfd)) |
| 2313 | fprintf (file, _(" [interworking flag not initialised]")); |
| 2314 | else if (INTERWORK_FLAG (abfd)) |
| 2315 | fprintf (file, _(" [interworking supported]")); |
| 2316 | else |
| 2317 | fprintf (file, _(" [interworking not supported]")); |
| 2318 | |
| 2319 | fputc ('\n', file); |
| 2320 | |
| 2321 | return TRUE; |
| 2322 | } |
| 2323 | |
| 2324 | /* Copies the given flags into the coff_tdata.flags field. |
| 2325 | Typically these flags come from the f_flags[] field of |
| 2326 | the COFF filehdr structure, which contains important, |
| 2327 | target specific information. |
| 2328 | Note: Although this function is static, it is explicitly |
| 2329 | called from both coffcode.h and peicode.h. */ |
| 2330 | |
| 2331 | static bfd_boolean |
| 2332 | _bfd_coff_arm_set_private_flags (bfd * abfd, flagword flags) |
| 2333 | { |
| 2334 | flagword flag; |
| 2335 | |
| 2336 | BFD_ASSERT (abfd != NULL); |
| 2337 | |
| 2338 | flag = (flags & F_APCS26) ? F_APCS_26 : 0; |
| 2339 | |
| 2340 | /* Make sure that the APCS field has not been initialised to the opposite |
| 2341 | value. */ |
| 2342 | if (APCS_SET (abfd) |
| 2343 | && ( (APCS_26_FLAG (abfd) != flag) |
| 2344 | || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT)) |
| 2345 | || (PIC_FLAG (abfd) != (flags & F_PIC)) |
| 2346 | )) |
| 2347 | return FALSE; |
| 2348 | |
| 2349 | flag |= (flags & (F_APCS_FLOAT | F_PIC)); |
| 2350 | |
| 2351 | SET_APCS_FLAGS (abfd, flag); |
| 2352 | |
| 2353 | flag = (flags & F_INTERWORK); |
| 2354 | |
| 2355 | /* If the BFD has already had its interworking flag set, but it |
| 2356 | is different from the value that we have been asked to set, |
| 2357 | then assume that that merged code will not support interworking |
| 2358 | and set the flag accordingly. */ |
| 2359 | if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag)) |
| 2360 | { |
| 2361 | if (flag) |
| 2362 | _bfd_error_handler (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"), |
| 2363 | abfd); |
| 2364 | else |
| 2365 | _bfd_error_handler (_("Warning: Clearing the interworking flag of %B due to outside request"), |
| 2366 | abfd); |
| 2367 | flag = 0; |
| 2368 | } |
| 2369 | |
| 2370 | SET_INTERWORK_FLAG (abfd, flag); |
| 2371 | |
| 2372 | return TRUE; |
| 2373 | } |
| 2374 | |
| 2375 | /* Copy the important parts of the target specific data |
| 2376 | from one instance of a BFD to another. */ |
| 2377 | |
| 2378 | static bfd_boolean |
| 2379 | coff_arm_copy_private_bfd_data (bfd * src, bfd * dest) |
| 2380 | { |
| 2381 | BFD_ASSERT (src != NULL && dest != NULL); |
| 2382 | |
| 2383 | if (src == dest) |
| 2384 | return TRUE; |
| 2385 | |
| 2386 | /* If the destination is not in the same format as the source, do not do |
| 2387 | the copy. */ |
| 2388 | if (src->xvec != dest->xvec) |
| 2389 | return TRUE; |
| 2390 | |
| 2391 | /* Copy the flags field. */ |
| 2392 | if (APCS_SET (src)) |
| 2393 | { |
| 2394 | if (APCS_SET (dest)) |
| 2395 | { |
| 2396 | /* If the src and dest have different APCS flag bits set, fail. */ |
| 2397 | if (APCS_26_FLAG (dest) != APCS_26_FLAG (src)) |
| 2398 | return FALSE; |
| 2399 | |
| 2400 | if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src)) |
| 2401 | return FALSE; |
| 2402 | |
| 2403 | if (PIC_FLAG (dest) != PIC_FLAG (src)) |
| 2404 | return FALSE; |
| 2405 | } |
| 2406 | else |
| 2407 | SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src) |
| 2408 | | PIC_FLAG (src)); |
| 2409 | } |
| 2410 | |
| 2411 | if (INTERWORK_SET (src)) |
| 2412 | { |
| 2413 | if (INTERWORK_SET (dest)) |
| 2414 | { |
| 2415 | /* If the src and dest have different interworking flags then turn |
| 2416 | off the interworking bit. */ |
| 2417 | if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src)) |
| 2418 | { |
| 2419 | if (INTERWORK_FLAG (dest)) |
| 2420 | { |
| 2421 | /* xgettext:c-format */ |
| 2422 | _bfd_error_handler (_("\ |
| 2423 | Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"), |
| 2424 | dest, src); |
| 2425 | } |
| 2426 | |
| 2427 | SET_INTERWORK_FLAG (dest, 0); |
| 2428 | } |
| 2429 | } |
| 2430 | else |
| 2431 | { |
| 2432 | SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src)); |
| 2433 | } |
| 2434 | } |
| 2435 | |
| 2436 | return TRUE; |
| 2437 | } |
| 2438 | |
| 2439 | /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX |
| 2440 | *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */ |
| 2441 | #ifndef LOCAL_LABEL_PREFIX |
| 2442 | #define LOCAL_LABEL_PREFIX "" |
| 2443 | #endif |
| 2444 | #ifndef USER_LABEL_PREFIX |
| 2445 | #define USER_LABEL_PREFIX "_" |
| 2446 | #endif |
| 2447 | |
| 2448 | /* Like _bfd_coff_is_local_label_name, but |
| 2449 | a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be |
| 2450 | non-local. |
| 2451 | b) Allow other prefixes than ".", e.g. an empty prefix would cause all |
| 2452 | labels of the form Lxxx to be stripped. */ |
| 2453 | |
| 2454 | static bfd_boolean |
| 2455 | coff_arm_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED, |
| 2456 | const char * name) |
| 2457 | { |
| 2458 | #ifdef USER_LABEL_PREFIX |
| 2459 | if (USER_LABEL_PREFIX[0] != 0) |
| 2460 | { |
| 2461 | size_t len = strlen (USER_LABEL_PREFIX); |
| 2462 | |
| 2463 | if (strncmp (name, USER_LABEL_PREFIX, len) == 0) |
| 2464 | return FALSE; |
| 2465 | } |
| 2466 | #endif |
| 2467 | |
| 2468 | #ifdef LOCAL_LABEL_PREFIX |
| 2469 | /* If there is a prefix for local labels then look for this. |
| 2470 | If the prefix exists, but it is empty, then ignore the test. */ |
| 2471 | |
| 2472 | if (LOCAL_LABEL_PREFIX[0] != 0) |
| 2473 | { |
| 2474 | size_t len = strlen (LOCAL_LABEL_PREFIX); |
| 2475 | |
| 2476 | if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0) |
| 2477 | return FALSE; |
| 2478 | |
| 2479 | /* Perform the checks below for the rest of the name. */ |
| 2480 | name += len; |
| 2481 | } |
| 2482 | #endif |
| 2483 | |
| 2484 | return name[0] == 'L'; |
| 2485 | } |
| 2486 | |
| 2487 | /* This piece of machinery exists only to guarantee that the bfd that holds |
| 2488 | the glue section is written last. |
| 2489 | |
| 2490 | This does depend on bfd_make_section attaching a new section to the |
| 2491 | end of the section list for the bfd. */ |
| 2492 | |
| 2493 | static bfd_boolean |
| 2494 | coff_arm_link_output_has_begun (bfd * sub, struct coff_final_link_info * info) |
| 2495 | { |
| 2496 | return (sub->output_has_begun |
| 2497 | || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner); |
| 2498 | } |
| 2499 | |
| 2500 | static bfd_boolean |
| 2501 | coff_arm_final_link_postscript (bfd * abfd ATTRIBUTE_UNUSED, |
| 2502 | struct coff_final_link_info * pfinfo) |
| 2503 | { |
| 2504 | struct coff_arm_link_hash_table * globals; |
| 2505 | |
| 2506 | globals = coff_arm_hash_table (pfinfo->info); |
| 2507 | |
| 2508 | BFD_ASSERT (globals != NULL); |
| 2509 | |
| 2510 | if (globals->bfd_of_glue_owner != NULL) |
| 2511 | { |
| 2512 | if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner)) |
| 2513 | return FALSE; |
| 2514 | |
| 2515 | globals->bfd_of_glue_owner->output_has_begun = TRUE; |
| 2516 | } |
| 2517 | |
| 2518 | return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION); |
| 2519 | } |
| 2520 | |
| 2521 | #ifndef bfd_pe_print_pdata |
| 2522 | #define bfd_pe_print_pdata NULL |
| 2523 | #endif |
| 2524 | |
| 2525 | #include "coffcode.h" |
| 2526 | |
| 2527 | #ifndef TARGET_LITTLE_SYM |
| 2528 | #define TARGET_LITTLE_SYM arm_coff_le_vec |
| 2529 | #endif |
| 2530 | #ifndef TARGET_LITTLE_NAME |
| 2531 | #define TARGET_LITTLE_NAME "coff-arm-little" |
| 2532 | #endif |
| 2533 | #ifndef TARGET_BIG_SYM |
| 2534 | #define TARGET_BIG_SYM arm_coff_be_vec |
| 2535 | #endif |
| 2536 | #ifndef TARGET_BIG_NAME |
| 2537 | #define TARGET_BIG_NAME "coff-arm-big" |
| 2538 | #endif |
| 2539 | |
| 2540 | #ifndef TARGET_UNDERSCORE |
| 2541 | #define TARGET_UNDERSCORE 0 |
| 2542 | #endif |
| 2543 | |
| 2544 | #ifndef EXTRA_S_FLAGS |
| 2545 | #ifdef COFF_WITH_PE |
| 2546 | #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES) |
| 2547 | #else |
| 2548 | #define EXTRA_S_FLAGS SEC_CODE |
| 2549 | #endif |
| 2550 | #endif |
| 2551 | |
| 2552 | /* Forward declaration for use initialising alternative_target field. */ |
| 2553 | extern const bfd_target TARGET_BIG_SYM ; |
| 2554 | |
| 2555 | /* Target vectors. */ |
| 2556 | CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE) |
| 2557 | CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE) |