| 1 | /* BFD back-end for ARM COFF files. |
| 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 3 | 2000, 2001 |
| 4 | Free Software Foundation, Inc. |
| 5 | Written by Cygnus Support. |
| 6 | |
| 7 | This file is part of BFD, the Binary File Descriptor library. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "bfd.h" |
| 24 | #include "sysdep.h" |
| 25 | #include "libbfd.h" |
| 26 | |
| 27 | #include "coff/arm.h" |
| 28 | |
| 29 | #include "coff/internal.h" |
| 30 | |
| 31 | #ifdef COFF_WITH_PE |
| 32 | #include "coff/pe.h" |
| 33 | #endif |
| 34 | |
| 35 | #include "libcoff.h" |
| 36 | |
| 37 | /* Macros for manipulation the bits in the flags field of the coff data |
| 38 | structure. */ |
| 39 | #define APCS_26_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_26) |
| 40 | #define APCS_FLOAT_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_FLOAT) |
| 41 | #define PIC_FLAG( abfd ) (coff_data (abfd)->flags & F_PIC) |
| 42 | #define APCS_SET( abfd ) (coff_data (abfd)->flags & F_APCS_SET) |
| 43 | #define SET_APCS_FLAGS( abfd, flgs) (coff_data (abfd)->flags = \ |
| 44 | (coff_data (abfd)->flags & ~ (F_APCS_26 | F_APCS_FLOAT | F_PIC)) \ |
| 45 | | (flgs | F_APCS_SET)) |
| 46 | #define INTERWORK_FLAG( abfd ) (coff_data (abfd)->flags & F_INTERWORK) |
| 47 | #define INTERWORK_SET( abfd ) (coff_data (abfd)->flags & F_INTERWORK_SET) |
| 48 | #define SET_INTERWORK_FLAG( abfd, flg ) (coff_data (abfd)->flags = \ |
| 49 | (coff_data (abfd)->flags & ~ F_INTERWORK) \ |
| 50 | | (flg | F_INTERWORK_SET)) |
| 51 | |
| 52 | #ifndef NUM_ELEM |
| 53 | #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0])) |
| 54 | #endif |
| 55 | |
| 56 | typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype; |
| 57 | /* some typedefs for holding instructions */ |
| 58 | typedef unsigned long int insn32; |
| 59 | typedef unsigned short int insn16; |
| 60 | |
| 61 | /* Forward declarations for stupid compilers. */ |
| 62 | static boolean coff_arm_relocate_section |
| 63 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 64 | struct internal_reloc *, struct internal_syment *, asection **)); |
| 65 | static bfd_reloc_status_type aoutarm_fix_pcrel_26_done |
| 66 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 67 | static bfd_reloc_status_type aoutarm_fix_pcrel_26 |
| 68 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 69 | static bfd_reloc_status_type coff_thumb_pcrel_23 |
| 70 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 71 | static bfd_reloc_status_type coff_thumb_pcrel_12 |
| 72 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 73 | static bfd_reloc_status_type coff_thumb_pcrel_9 |
| 74 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 75 | static bfd_reloc_status_type coff_arm_reloc |
| 76 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 77 | static boolean coff_arm_adjust_symndx |
| 78 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, |
| 79 | asection *, struct internal_reloc *, boolean *)); |
| 80 | static reloc_howto_type * coff_arm_rtype_to_howto |
| 81 | PARAMS ((bfd *, asection *, struct internal_reloc *, |
| 82 | struct coff_link_hash_entry *, struct internal_syment *, bfd_vma *)); |
| 83 | static bfd_reloc_status_type coff_thumb_pcrel_common |
| 84 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **, |
| 85 | thumb_pcrel_branchtype)); |
| 86 | static CONST struct reloc_howto_struct * coff_arm_reloc_type_lookup |
| 87 | PARAMS ((bfd *, bfd_reloc_code_real_type)); |
| 88 | static struct bfd_link_hash_table * coff_arm_link_hash_table_create |
| 89 | PARAMS ((bfd *)); |
| 90 | static insn32 insert_thumb_branch |
| 91 | PARAMS ((insn32, int)); |
| 92 | static struct coff_link_hash_entry * find_thumb_glue |
| 93 | PARAMS ((struct bfd_link_info *, CONST char *, bfd *)); |
| 94 | static struct coff_link_hash_entry * find_arm_glue |
| 95 | PARAMS ((struct bfd_link_info *, CONST char *, bfd *)); |
| 96 | #ifndef COFF_IMAGE_WITH_PE |
| 97 | static void record_arm_to_thumb_glue |
| 98 | PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *)); |
| 99 | static void record_thumb_to_arm_glue |
| 100 | PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *)); |
| 101 | #endif |
| 102 | static boolean coff_arm_merge_private_bfd_data |
| 103 | PARAMS ((bfd *, bfd *)); |
| 104 | static boolean coff_arm_print_private_bfd_data |
| 105 | PARAMS ((bfd *, PTR)); |
| 106 | static boolean _bfd_coff_arm_set_private_flags |
| 107 | PARAMS ((bfd *, flagword)); |
| 108 | static boolean coff_arm_copy_private_bfd_data |
| 109 | PARAMS ((bfd *, bfd *)); |
| 110 | static boolean coff_arm_is_local_label_name |
| 111 | PARAMS ((bfd *, const char *)); |
| 112 | static boolean coff_arm_link_output_has_begun |
| 113 | PARAMS ((bfd *, struct coff_final_link_info *)); |
| 114 | static boolean coff_arm_final_link_postscript |
| 115 | PARAMS ((bfd *, struct coff_final_link_info *)); |
| 116 | static void arm_emit_base_file_entry |
| 117 | PARAMS ((struct bfd_link_info *, bfd *, asection *, bfd_vma)); |
| 118 | |
| 119 | /* The linker script knows the section names for placement. |
| 120 | The entry_names are used to do simple name mangling on the stubs. |
| 121 | Given a function name, and its type, the stub can be found. The |
| 122 | name can be changed. The only requirement is the %s be present. */ |
| 123 | |
| 124 | #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" |
| 125 | #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" |
| 126 | |
| 127 | #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" |
| 128 | #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" |
| 129 | |
| 130 | /* Used by the assembler. */ |
| 131 | |
| 132 | static bfd_reloc_status_type |
| 133 | coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, |
| 134 | error_message) |
| 135 | bfd *abfd; |
| 136 | arelent *reloc_entry; |
| 137 | asymbol *symbol ATTRIBUTE_UNUSED; |
| 138 | PTR data; |
| 139 | asection *input_section ATTRIBUTE_UNUSED; |
| 140 | bfd *output_bfd; |
| 141 | char **error_message ATTRIBUTE_UNUSED; |
| 142 | { |
| 143 | symvalue diff; |
| 144 | if (output_bfd == (bfd *) NULL) |
| 145 | return bfd_reloc_continue; |
| 146 | |
| 147 | diff = reloc_entry->addend; |
| 148 | |
| 149 | #define DOIT(x) \ |
| 150 | x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask)) |
| 151 | |
| 152 | if (diff != 0) |
| 153 | { |
| 154 | reloc_howto_type *howto = reloc_entry->howto; |
| 155 | unsigned char *addr = (unsigned char *) data + reloc_entry->address; |
| 156 | |
| 157 | switch (howto->size) |
| 158 | { |
| 159 | case 0: |
| 160 | { |
| 161 | char x = bfd_get_8 (abfd, addr); |
| 162 | DOIT (x); |
| 163 | bfd_put_8 (abfd, x, addr); |
| 164 | } |
| 165 | break; |
| 166 | |
| 167 | case 1: |
| 168 | { |
| 169 | short x = bfd_get_16 (abfd, addr); |
| 170 | DOIT (x); |
| 171 | bfd_put_16 (abfd, x, addr); |
| 172 | } |
| 173 | break; |
| 174 | |
| 175 | case 2: |
| 176 | { |
| 177 | long x = bfd_get_32 (abfd, addr); |
| 178 | DOIT (x); |
| 179 | bfd_put_32 (abfd, x, addr); |
| 180 | } |
| 181 | break; |
| 182 | |
| 183 | default: |
| 184 | abort (); |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | /* Now let bfd_perform_relocation finish everything up. */ |
| 189 | return bfd_reloc_continue; |
| 190 | } |
| 191 | |
| 192 | /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name() |
| 193 | in this file), then TARGET_UNDERSCORE should be defined, otherwise it |
| 194 | should not. */ |
| 195 | #ifndef TARGET_UNDERSCORE |
| 196 | #define TARGET_UNDERSCORE '_' |
| 197 | #endif |
| 198 | |
| 199 | #ifndef PCRELOFFSET |
| 200 | #define PCRELOFFSET true |
| 201 | #endif |
| 202 | |
| 203 | /* These most certainly belong somewhere else. Just had to get rid of |
| 204 | the manifest constants in the code. */ |
| 205 | #define ARM_8 0 |
| 206 | #define ARM_16 1 |
| 207 | #define ARM_32 2 |
| 208 | #define ARM_26 3 |
| 209 | #define ARM_DISP8 4 |
| 210 | #define ARM_DISP16 5 |
| 211 | #define ARM_DISP32 6 |
| 212 | #define ARM_26D 7 |
| 213 | /* 8 is unused */ |
| 214 | #define ARM_NEG16 9 |
| 215 | #define ARM_NEG32 10 |
| 216 | #define ARM_RVA32 11 |
| 217 | #define ARM_THUMB9 12 |
| 218 | #define ARM_THUMB12 13 |
| 219 | #define ARM_THUMB23 14 |
| 220 | |
| 221 | #ifdef ARM_WINCE |
| 222 | #undef ARM_32 |
| 223 | #undef ARM_RVA32 |
| 224 | #undef ARM_26 |
| 225 | #undef ARM_THUMB12 |
| 226 | #undef ARM_26D |
| 227 | |
| 228 | #define ARM_32 1 |
| 229 | #define ARM_RVA32 2 |
| 230 | #define ARM_26 3 |
| 231 | #define ARM_THUMB12 4 |
| 232 | #define ARM_26D 5 |
| 233 | #define ARM_SECTION 14 |
| 234 | #define ARM_SECREL 15 |
| 235 | #endif |
| 236 | |
| 237 | static reloc_howto_type aoutarm_std_reloc_howto[] = |
| 238 | { |
| 239 | #ifdef ARM_WINCE |
| 240 | EMPTY_HOWTO (-1), |
| 241 | HOWTO (ARM_32, |
| 242 | 0, |
| 243 | 2, |
| 244 | 32, |
| 245 | false, |
| 246 | 0, |
| 247 | complain_overflow_bitfield, |
| 248 | coff_arm_reloc, |
| 249 | "ARM_32", |
| 250 | true, |
| 251 | 0xffffffff, |
| 252 | 0xffffffff, |
| 253 | PCRELOFFSET), |
| 254 | HOWTO (ARM_RVA32, |
| 255 | 0, |
| 256 | 2, |
| 257 | 32, |
| 258 | false, |
| 259 | 0, |
| 260 | complain_overflow_bitfield, |
| 261 | coff_arm_reloc, |
| 262 | "ARM_RVA32", |
| 263 | true, |
| 264 | 0xffffffff, |
| 265 | 0xffffffff, |
| 266 | PCRELOFFSET), |
| 267 | HOWTO (ARM_26, |
| 268 | 2, |
| 269 | 2, |
| 270 | 24, |
| 271 | true, |
| 272 | 0, |
| 273 | complain_overflow_signed, |
| 274 | aoutarm_fix_pcrel_26 , |
| 275 | "ARM_26", |
| 276 | false, |
| 277 | 0x00ffffff, |
| 278 | 0x00ffffff, |
| 279 | PCRELOFFSET), |
| 280 | HOWTO (ARM_THUMB12, |
| 281 | 1, |
| 282 | 1, |
| 283 | 11, |
| 284 | true, |
| 285 | 0, |
| 286 | complain_overflow_signed, |
| 287 | coff_thumb_pcrel_12 , |
| 288 | "ARM_THUMB12", |
| 289 | false, |
| 290 | 0x000007ff, |
| 291 | 0x000007ff, |
| 292 | PCRELOFFSET), |
| 293 | HOWTO (ARM_26D, |
| 294 | 2, |
| 295 | 2, |
| 296 | 24, |
| 297 | false, |
| 298 | 0, |
| 299 | complain_overflow_dont, |
| 300 | aoutarm_fix_pcrel_26_done, |
| 301 | "ARM_26D", |
| 302 | true, |
| 303 | 0x00ffffff, |
| 304 | 0x0, |
| 305 | false), |
| 306 | EMPTY_HOWTO (-1), |
| 307 | EMPTY_HOWTO (-1), |
| 308 | EMPTY_HOWTO (-1), |
| 309 | EMPTY_HOWTO (-1), |
| 310 | EMPTY_HOWTO (-1), |
| 311 | EMPTY_HOWTO (-1), |
| 312 | EMPTY_HOWTO (-1), |
| 313 | EMPTY_HOWTO (-1), |
| 314 | HOWTO (ARM_SECTION, |
| 315 | 0, |
| 316 | 1, |
| 317 | 16, |
| 318 | false, |
| 319 | 0, |
| 320 | complain_overflow_bitfield, |
| 321 | coff_arm_reloc, |
| 322 | "ARM_16", |
| 323 | true, |
| 324 | 0x0000ffff, |
| 325 | 0x0000ffff, |
| 326 | PCRELOFFSET), |
| 327 | HOWTO (ARM_SECREL, |
| 328 | 0, |
| 329 | 2, |
| 330 | 32, |
| 331 | false, |
| 332 | 0, |
| 333 | complain_overflow_bitfield, |
| 334 | coff_arm_reloc, |
| 335 | "ARM_32", |
| 336 | true, |
| 337 | 0xffffffff, |
| 338 | 0xffffffff, |
| 339 | PCRELOFFSET), |
| 340 | #else /* not ARM_WINCE */ |
| 341 | HOWTO (ARM_8, /* type */ |
| 342 | 0, /* rightshift */ |
| 343 | 0, /* size */ |
| 344 | 8, /* bitsize */ |
| 345 | false, /* pc_relative */ |
| 346 | 0, /* bitpos */ |
| 347 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 348 | coff_arm_reloc, /* special_function */ |
| 349 | "ARM_8", /* name */ |
| 350 | true, /* partial_inplace */ |
| 351 | 0x000000ff, /* src_mask */ |
| 352 | 0x000000ff, /* dst_mask */ |
| 353 | PCRELOFFSET /* pcrel_offset */), |
| 354 | HOWTO (ARM_16, |
| 355 | 0, |
| 356 | 1, |
| 357 | 16, |
| 358 | false, |
| 359 | 0, |
| 360 | complain_overflow_bitfield, |
| 361 | coff_arm_reloc, |
| 362 | "ARM_16", |
| 363 | true, |
| 364 | 0x0000ffff, |
| 365 | 0x0000ffff, |
| 366 | PCRELOFFSET), |
| 367 | HOWTO (ARM_32, |
| 368 | 0, |
| 369 | 2, |
| 370 | 32, |
| 371 | false, |
| 372 | 0, |
| 373 | complain_overflow_bitfield, |
| 374 | coff_arm_reloc, |
| 375 | "ARM_32", |
| 376 | true, |
| 377 | 0xffffffff, |
| 378 | 0xffffffff, |
| 379 | PCRELOFFSET), |
| 380 | HOWTO (ARM_26, |
| 381 | 2, |
| 382 | 2, |
| 383 | 24, |
| 384 | true, |
| 385 | 0, |
| 386 | complain_overflow_signed, |
| 387 | aoutarm_fix_pcrel_26 , |
| 388 | "ARM_26", |
| 389 | false, |
| 390 | 0x00ffffff, |
| 391 | 0x00ffffff, |
| 392 | PCRELOFFSET), |
| 393 | HOWTO (ARM_DISP8, |
| 394 | 0, |
| 395 | 0, |
| 396 | 8, |
| 397 | true, |
| 398 | 0, |
| 399 | complain_overflow_signed, |
| 400 | coff_arm_reloc, |
| 401 | "ARM_DISP8", |
| 402 | true, |
| 403 | 0x000000ff, |
| 404 | 0x000000ff, |
| 405 | true), |
| 406 | HOWTO (ARM_DISP16, |
| 407 | 0, |
| 408 | 1, |
| 409 | 16, |
| 410 | true, |
| 411 | 0, |
| 412 | complain_overflow_signed, |
| 413 | coff_arm_reloc, |
| 414 | "ARM_DISP16", |
| 415 | true, |
| 416 | 0x0000ffff, |
| 417 | 0x0000ffff, |
| 418 | true), |
| 419 | HOWTO (ARM_DISP32, |
| 420 | 0, |
| 421 | 2, |
| 422 | 32, |
| 423 | true, |
| 424 | 0, |
| 425 | complain_overflow_signed, |
| 426 | coff_arm_reloc, |
| 427 | "ARM_DISP32", |
| 428 | true, |
| 429 | 0xffffffff, |
| 430 | 0xffffffff, |
| 431 | true), |
| 432 | HOWTO (ARM_26D, |
| 433 | 2, |
| 434 | 2, |
| 435 | 24, |
| 436 | false, |
| 437 | 0, |
| 438 | complain_overflow_dont, |
| 439 | aoutarm_fix_pcrel_26_done, |
| 440 | "ARM_26D", |
| 441 | true, |
| 442 | 0x00ffffff, |
| 443 | 0x0, |
| 444 | false), |
| 445 | /* 8 is unused */ |
| 446 | EMPTY_HOWTO (-1), |
| 447 | HOWTO (ARM_NEG16, |
| 448 | 0, |
| 449 | -1, |
| 450 | 16, |
| 451 | false, |
| 452 | 0, |
| 453 | complain_overflow_bitfield, |
| 454 | coff_arm_reloc, |
| 455 | "ARM_NEG16", |
| 456 | true, |
| 457 | 0x0000ffff, |
| 458 | 0x0000ffff, |
| 459 | false), |
| 460 | HOWTO (ARM_NEG32, |
| 461 | 0, |
| 462 | -2, |
| 463 | 32, |
| 464 | false, |
| 465 | 0, |
| 466 | complain_overflow_bitfield, |
| 467 | coff_arm_reloc, |
| 468 | "ARM_NEG32", |
| 469 | true, |
| 470 | 0xffffffff, |
| 471 | 0xffffffff, |
| 472 | false), |
| 473 | HOWTO (ARM_RVA32, |
| 474 | 0, |
| 475 | 2, |
| 476 | 32, |
| 477 | false, |
| 478 | 0, |
| 479 | complain_overflow_bitfield, |
| 480 | coff_arm_reloc, |
| 481 | "ARM_RVA32", |
| 482 | true, |
| 483 | 0xffffffff, |
| 484 | 0xffffffff, |
| 485 | PCRELOFFSET), |
| 486 | HOWTO (ARM_THUMB9, |
| 487 | 1, |
| 488 | 1, |
| 489 | 8, |
| 490 | true, |
| 491 | 0, |
| 492 | complain_overflow_signed, |
| 493 | coff_thumb_pcrel_9 , |
| 494 | "ARM_THUMB9", |
| 495 | false, |
| 496 | 0x000000ff, |
| 497 | 0x000000ff, |
| 498 | PCRELOFFSET), |
| 499 | HOWTO (ARM_THUMB12, |
| 500 | 1, |
| 501 | 1, |
| 502 | 11, |
| 503 | true, |
| 504 | 0, |
| 505 | complain_overflow_signed, |
| 506 | coff_thumb_pcrel_12 , |
| 507 | "ARM_THUMB12", |
| 508 | false, |
| 509 | 0x000007ff, |
| 510 | 0x000007ff, |
| 511 | PCRELOFFSET), |
| 512 | HOWTO (ARM_THUMB23, |
| 513 | 1, |
| 514 | 2, |
| 515 | 22, |
| 516 | true, |
| 517 | 0, |
| 518 | complain_overflow_signed, |
| 519 | coff_thumb_pcrel_23 , |
| 520 | "ARM_THUMB23", |
| 521 | false, |
| 522 | 0x07ff07ff, |
| 523 | 0x07ff07ff, |
| 524 | PCRELOFFSET) |
| 525 | #endif /* not ARM_WINCE */ |
| 526 | }; |
| 527 | |
| 528 | #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto) |
| 529 | |
| 530 | #ifdef COFF_WITH_PE |
| 531 | static boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *)); |
| 532 | /* Return true if this relocation should |
| 533 | appear in the output .reloc section. */ |
| 534 | |
| 535 | static boolean |
| 536 | in_reloc_p (abfd, howto) |
| 537 | bfd * abfd ATTRIBUTE_UNUSED; |
| 538 | reloc_howto_type * howto; |
| 539 | { |
| 540 | return !howto->pc_relative && howto->type != ARM_RVA32; |
| 541 | } |
| 542 | #endif |
| 543 | |
| 544 | #define RTYPE2HOWTO(cache_ptr, dst) \ |
| 545 | (cache_ptr)->howto = \ |
| 546 | (dst)->r_type < NUM_RELOCS \ |
| 547 | ? aoutarm_std_reloc_howto + (dst)->r_type \ |
| 548 | : NULL |
| 549 | |
| 550 | #define coff_rtype_to_howto coff_arm_rtype_to_howto |
| 551 | |
| 552 | static reloc_howto_type * |
| 553 | coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp) |
| 554 | bfd *abfd ATTRIBUTE_UNUSED; |
| 555 | asection *sec; |
| 556 | struct internal_reloc *rel; |
| 557 | struct coff_link_hash_entry *h ATTRIBUTE_UNUSED; |
| 558 | struct internal_syment *sym ATTRIBUTE_UNUSED; |
| 559 | bfd_vma *addendp; |
| 560 | { |
| 561 | reloc_howto_type * howto; |
| 562 | |
| 563 | if (rel->r_type >= NUM_RELOCS) |
| 564 | return NULL; |
| 565 | |
| 566 | howto = aoutarm_std_reloc_howto + rel->r_type; |
| 567 | |
| 568 | if (rel->r_type == ARM_RVA32) |
| 569 | *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase; |
| 570 | |
| 571 | return howto; |
| 572 | } |
| 573 | |
| 574 | /* Used by the assembler. */ |
| 575 | |
| 576 | static bfd_reloc_status_type |
| 577 | aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section, |
| 578 | output_bfd, error_message) |
| 579 | bfd *abfd ATTRIBUTE_UNUSED; |
| 580 | arelent *reloc_entry ATTRIBUTE_UNUSED; |
| 581 | asymbol *symbol ATTRIBUTE_UNUSED; |
| 582 | PTR data ATTRIBUTE_UNUSED; |
| 583 | asection *input_section ATTRIBUTE_UNUSED; |
| 584 | bfd *output_bfd ATTRIBUTE_UNUSED; |
| 585 | char **error_message ATTRIBUTE_UNUSED; |
| 586 | { |
| 587 | /* This is dead simple at present. */ |
| 588 | return bfd_reloc_ok; |
| 589 | } |
| 590 | |
| 591 | /* Used by the assembler. */ |
| 592 | |
| 593 | static bfd_reloc_status_type |
| 594 | aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section, |
| 595 | output_bfd, error_message) |
| 596 | bfd *abfd; |
| 597 | arelent *reloc_entry; |
| 598 | asymbol *symbol; |
| 599 | PTR data; |
| 600 | asection *input_section; |
| 601 | bfd *output_bfd; |
| 602 | char **error_message ATTRIBUTE_UNUSED; |
| 603 | { |
| 604 | bfd_vma relocation; |
| 605 | bfd_size_type addr = reloc_entry->address; |
| 606 | long target = bfd_get_32 (abfd, (bfd_byte *) data + addr); |
| 607 | bfd_reloc_status_type flag = bfd_reloc_ok; |
| 608 | |
| 609 | /* If this is an undefined symbol, return error. */ |
| 610 | if (symbol->section == &bfd_und_section |
| 611 | && (symbol->flags & BSF_WEAK) == 0) |
| 612 | return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined; |
| 613 | |
| 614 | /* If the sections are different, and we are doing a partial relocation, |
| 615 | just ignore it for now. */ |
| 616 | if (symbol->section->name != input_section->name |
| 617 | && output_bfd != (bfd *)NULL) |
| 618 | return bfd_reloc_continue; |
| 619 | |
| 620 | relocation = (target & 0x00ffffff) << 2; |
| 621 | relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */ |
| 622 | relocation += symbol->value; |
| 623 | relocation += symbol->section->output_section->vma; |
| 624 | relocation += symbol->section->output_offset; |
| 625 | relocation += reloc_entry->addend; |
| 626 | relocation -= input_section->output_section->vma; |
| 627 | relocation -= input_section->output_offset; |
| 628 | relocation -= addr; |
| 629 | |
| 630 | if (relocation & 3) |
| 631 | return bfd_reloc_overflow; |
| 632 | |
| 633 | /* Check for overflow. */ |
| 634 | if (relocation & 0x02000000) |
| 635 | { |
| 636 | if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff) |
| 637 | flag = bfd_reloc_overflow; |
| 638 | } |
| 639 | else if (relocation & ~0x03ffffff) |
| 640 | flag = bfd_reloc_overflow; |
| 641 | |
| 642 | target &= ~0x00ffffff; |
| 643 | target |= (relocation >> 2) & 0x00ffffff; |
| 644 | bfd_put_32 (abfd, target, (bfd_byte *) data + addr); |
| 645 | |
| 646 | /* Now the ARM magic... Change the reloc type so that it is marked as done. |
| 647 | Strictly this is only necessary if we are doing a partial relocation. */ |
| 648 | reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D]; |
| 649 | |
| 650 | return flag; |
| 651 | } |
| 652 | |
| 653 | static bfd_reloc_status_type |
| 654 | coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section, |
| 655 | output_bfd, error_message, btype) |
| 656 | bfd *abfd; |
| 657 | arelent *reloc_entry; |
| 658 | asymbol *symbol; |
| 659 | PTR data; |
| 660 | asection *input_section; |
| 661 | bfd *output_bfd; |
| 662 | char **error_message ATTRIBUTE_UNUSED; |
| 663 | thumb_pcrel_branchtype btype; |
| 664 | { |
| 665 | bfd_vma relocation = 0; |
| 666 | bfd_size_type addr = reloc_entry->address; |
| 667 | long target = bfd_get_32 (abfd, (bfd_byte *) data + addr); |
| 668 | bfd_reloc_status_type flag = bfd_reloc_ok; |
| 669 | bfd_vma dstmsk; |
| 670 | bfd_vma offmsk; |
| 671 | bfd_vma signbit; |
| 672 | |
| 673 | /* NOTE: This routine is currently used by GAS, but not by the link |
| 674 | phase. */ |
| 675 | |
| 676 | switch (btype) |
| 677 | { |
| 678 | case b9: |
| 679 | dstmsk = 0x000000ff; |
| 680 | offmsk = 0x000001fe; |
| 681 | signbit = 0x00000100; |
| 682 | break; |
| 683 | |
| 684 | case b12: |
| 685 | dstmsk = 0x000007ff; |
| 686 | offmsk = 0x00000ffe; |
| 687 | signbit = 0x00000800; |
| 688 | break; |
| 689 | |
| 690 | case b23: |
| 691 | dstmsk = 0x07ff07ff; |
| 692 | offmsk = 0x007fffff; |
| 693 | signbit = 0x00400000; |
| 694 | break; |
| 695 | |
| 696 | default: |
| 697 | abort (); |
| 698 | } |
| 699 | |
| 700 | /* If this is an undefined symbol, return error. */ |
| 701 | if (symbol->section == &bfd_und_section |
| 702 | && (symbol->flags & BSF_WEAK) == 0) |
| 703 | return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined; |
| 704 | |
| 705 | /* If the sections are different, and we are doing a partial relocation, |
| 706 | just ignore it for now. */ |
| 707 | if (symbol->section->name != input_section->name |
| 708 | && output_bfd != (bfd *)NULL) |
| 709 | return bfd_reloc_continue; |
| 710 | |
| 711 | switch (btype) |
| 712 | { |
| 713 | case b9: |
| 714 | case b12: |
| 715 | relocation = ((target & dstmsk) << 1); |
| 716 | break; |
| 717 | |
| 718 | case b23: |
| 719 | if (bfd_big_endian (abfd)) |
| 720 | relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4); |
| 721 | else |
| 722 | relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15); |
| 723 | break; |
| 724 | |
| 725 | default: |
| 726 | abort (); |
| 727 | } |
| 728 | |
| 729 | relocation = (relocation ^ signbit) - signbit; /* Sign extend. */ |
| 730 | relocation += symbol->value; |
| 731 | relocation += symbol->section->output_section->vma; |
| 732 | relocation += symbol->section->output_offset; |
| 733 | relocation += reloc_entry->addend; |
| 734 | relocation -= input_section->output_section->vma; |
| 735 | relocation -= input_section->output_offset; |
| 736 | relocation -= addr; |
| 737 | |
| 738 | if (relocation & 1) |
| 739 | return bfd_reloc_overflow; |
| 740 | |
| 741 | /* Check for overflow. */ |
| 742 | if (relocation & signbit) |
| 743 | { |
| 744 | if ((relocation & ~offmsk) != ~offmsk) |
| 745 | flag = bfd_reloc_overflow; |
| 746 | } |
| 747 | else if (relocation & ~offmsk) |
| 748 | flag = bfd_reloc_overflow; |
| 749 | |
| 750 | target &= ~dstmsk; |
| 751 | switch (btype) |
| 752 | { |
| 753 | case b9: |
| 754 | case b12: |
| 755 | target |= (relocation >> 1); |
| 756 | break; |
| 757 | |
| 758 | case b23: |
| 759 | if (bfd_big_endian (abfd)) |
| 760 | target |= ((relocation & 0xfff) >> 1) | ((relocation << 4) & 0x07ff0000); |
| 761 | else |
| 762 | target |= ((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff); |
| 763 | break; |
| 764 | |
| 765 | default: |
| 766 | abort (); |
| 767 | } |
| 768 | |
| 769 | bfd_put_32 (abfd, target, (bfd_byte *) data + addr); |
| 770 | |
| 771 | /* Now the ARM magic... Change the reloc type so that it is marked as done. |
| 772 | Strictly this is only necessary if we are doing a partial relocation. */ |
| 773 | reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D]; |
| 774 | |
| 775 | /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */ |
| 776 | return flag; |
| 777 | } |
| 778 | |
| 779 | static bfd_reloc_status_type |
| 780 | coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section, |
| 781 | output_bfd, error_message) |
| 782 | bfd *abfd; |
| 783 | arelent *reloc_entry; |
| 784 | asymbol *symbol; |
| 785 | PTR data; |
| 786 | asection *input_section; |
| 787 | bfd *output_bfd; |
| 788 | char **error_message; |
| 789 | { |
| 790 | return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, |
| 791 | input_section, output_bfd, error_message, b23); |
| 792 | } |
| 793 | |
| 794 | static bfd_reloc_status_type |
| 795 | coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section, |
| 796 | output_bfd, error_message) |
| 797 | bfd *abfd; |
| 798 | arelent *reloc_entry; |
| 799 | asymbol *symbol; |
| 800 | PTR data; |
| 801 | asection *input_section; |
| 802 | bfd *output_bfd; |
| 803 | char **error_message; |
| 804 | { |
| 805 | return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, |
| 806 | input_section, output_bfd, error_message, b12); |
| 807 | } |
| 808 | |
| 809 | static bfd_reloc_status_type |
| 810 | coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section, |
| 811 | output_bfd, error_message) |
| 812 | bfd *abfd; |
| 813 | arelent *reloc_entry; |
| 814 | asymbol *symbol; |
| 815 | PTR data; |
| 816 | asection *input_section; |
| 817 | bfd *output_bfd; |
| 818 | char **error_message; |
| 819 | { |
| 820 | return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, |
| 821 | input_section, output_bfd, error_message, b9); |
| 822 | } |
| 823 | |
| 824 | static CONST struct reloc_howto_struct * |
| 825 | coff_arm_reloc_type_lookup (abfd, code) |
| 826 | bfd * abfd; |
| 827 | bfd_reloc_code_real_type code; |
| 828 | { |
| 829 | #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j |
| 830 | |
| 831 | if (code == BFD_RELOC_CTOR) |
| 832 | switch (bfd_get_arch_info (abfd)->bits_per_address) |
| 833 | { |
| 834 | case 32: |
| 835 | code = BFD_RELOC_32; |
| 836 | break; |
| 837 | default: |
| 838 | return (CONST struct reloc_howto_struct *) 0; |
| 839 | } |
| 840 | |
| 841 | switch (code) |
| 842 | { |
| 843 | #ifdef ARM_WINCE |
| 844 | ASTD (BFD_RELOC_32, ARM_32); |
| 845 | ASTD (BFD_RELOC_RVA, ARM_RVA32); |
| 846 | ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26); |
| 847 | ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12); |
| 848 | #else |
| 849 | ASTD (BFD_RELOC_8, ARM_8); |
| 850 | ASTD (BFD_RELOC_16, ARM_16); |
| 851 | ASTD (BFD_RELOC_32, ARM_32); |
| 852 | ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26); |
| 853 | ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26); |
| 854 | ASTD (BFD_RELOC_8_PCREL, ARM_DISP8); |
| 855 | ASTD (BFD_RELOC_16_PCREL, ARM_DISP16); |
| 856 | ASTD (BFD_RELOC_32_PCREL, ARM_DISP32); |
| 857 | ASTD (BFD_RELOC_RVA, ARM_RVA32); |
| 858 | ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9); |
| 859 | ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12); |
| 860 | ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23); |
| 861 | ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23); |
| 862 | #endif |
| 863 | default: return (CONST struct reloc_howto_struct *) 0; |
| 864 | } |
| 865 | } |
| 866 | |
| 867 | #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2) |
| 868 | #define COFF_PAGE_SIZE 0x1000 |
| 869 | /* Turn a howto into a reloc nunmber */ |
| 870 | |
| 871 | #define SELECT_RELOC(x,howto) { x.r_type = howto->type; } |
| 872 | #define BADMAG(x) ARMBADMAG(x) |
| 873 | #define ARM 1 /* Customize coffcode.h */ |
| 874 | |
| 875 | /* Extend the coff_link_hash_table structure with a few ARM specific fields. |
| 876 | This allows us to store global data here without actually creating any |
| 877 | global variables, which is a no-no in the BFD world. */ |
| 878 | struct coff_arm_link_hash_table |
| 879 | { |
| 880 | /* The original coff_link_hash_table structure. MUST be first field. */ |
| 881 | struct coff_link_hash_table root; |
| 882 | |
| 883 | /* The size in bytes of the section containg the Thumb-to-ARM glue. */ |
| 884 | long int thumb_glue_size; |
| 885 | |
| 886 | /* The size in bytes of the section containg the ARM-to-Thumb glue. */ |
| 887 | long int arm_glue_size; |
| 888 | |
| 889 | /* An arbitary input BFD chosen to hold the glue sections. */ |
| 890 | bfd * bfd_of_glue_owner; |
| 891 | |
| 892 | /* Support interworking with old, non-interworking aware ARM code. */ |
| 893 | int support_old_code; |
| 894 | }; |
| 895 | |
| 896 | /* Get the ARM coff linker hash table from a link_info structure. */ |
| 897 | #define coff_arm_hash_table(info) \ |
| 898 | ((struct coff_arm_link_hash_table *) ((info)->hash)) |
| 899 | |
| 900 | /* Create an ARM coff linker hash table. */ |
| 901 | |
| 902 | static struct bfd_link_hash_table * |
| 903 | coff_arm_link_hash_table_create (abfd) |
| 904 | bfd * abfd; |
| 905 | { |
| 906 | struct coff_arm_link_hash_table * ret; |
| 907 | |
| 908 | ret = ((struct coff_arm_link_hash_table *) |
| 909 | bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table))); |
| 910 | if (ret == (struct coff_arm_link_hash_table *) NULL) |
| 911 | return NULL; |
| 912 | |
| 913 | if (! _bfd_coff_link_hash_table_init |
| 914 | (& ret->root, abfd, _bfd_coff_link_hash_newfunc)) |
| 915 | { |
| 916 | bfd_release (abfd, ret); |
| 917 | return (struct bfd_link_hash_table *) NULL; |
| 918 | } |
| 919 | |
| 920 | ret->thumb_glue_size = 0; |
| 921 | ret->arm_glue_size = 0; |
| 922 | ret->bfd_of_glue_owner = NULL; |
| 923 | |
| 924 | return & ret->root.root; |
| 925 | } |
| 926 | |
| 927 | static void |
| 928 | arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset) |
| 929 | struct bfd_link_info *info; |
| 930 | bfd *output_bfd; |
| 931 | asection *input_section; |
| 932 | bfd_vma reloc_offset; |
| 933 | { |
| 934 | bfd_vma addr = reloc_offset |
| 935 | - input_section->vma |
| 936 | + input_section->output_offset |
| 937 | + input_section->output_section->vma; |
| 938 | |
| 939 | if (coff_data (output_bfd)->pe) |
| 940 | addr -= pe_data (output_bfd)->pe_opthdr.ImageBase; |
| 941 | fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file); |
| 942 | |
| 943 | } |
| 944 | \f |
| 945 | /* The thumb form of a long branch is a bit finicky, because the offset |
| 946 | encoding is split over two fields, each in it's own instruction. They |
| 947 | can occur in any order. So given a thumb form of long branch, and an |
| 948 | offset, insert the offset into the thumb branch and return finished |
| 949 | instruction. |
| 950 | |
| 951 | It takes two thumb instructions to encode the target address. Each has |
| 952 | 11 bits to invest. The upper 11 bits are stored in one (identifed by |
| 953 | H-0.. see below), the lower 11 bits are stored in the other (identified |
| 954 | by H-1). |
| 955 | |
| 956 | Combine together and shifted left by 1 (it's a half word address) and |
| 957 | there you have it. |
| 958 | |
| 959 | Op: 1111 = F, |
| 960 | H-0, upper address-0 = 000 |
| 961 | Op: 1111 = F, |
| 962 | H-1, lower address-0 = 800 |
| 963 | |
| 964 | They can be ordered either way, but the arm tools I've seen always put |
| 965 | the lower one first. It probably doesn't matter. krk@cygnus.com |
| 966 | |
| 967 | XXX: Actually the order does matter. The second instruction (H-1) |
| 968 | moves the computed address into the PC, so it must be the second one |
| 969 | in the sequence. The problem, however is that whilst little endian code |
| 970 | stores the instructions in HI then LOW order, big endian code does the |
| 971 | reverse. nickc@cygnus.com. */ |
| 972 | |
| 973 | #define LOW_HI_ORDER 0xF800F000 |
| 974 | #define HI_LOW_ORDER 0xF000F800 |
| 975 | |
| 976 | static insn32 |
| 977 | insert_thumb_branch (br_insn, rel_off) |
| 978 | insn32 br_insn; |
| 979 | int rel_off; |
| 980 | { |
| 981 | unsigned int low_bits; |
| 982 | unsigned int high_bits; |
| 983 | |
| 984 | BFD_ASSERT((rel_off & 1) != 1); |
| 985 | |
| 986 | rel_off >>= 1; /* half word aligned address */ |
| 987 | low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */ |
| 988 | high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */ |
| 989 | |
| 990 | if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER) |
| 991 | br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits; |
| 992 | else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER) |
| 993 | br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits; |
| 994 | else |
| 995 | /* FIXME: the BFD library should never abort - it should return an error status. */ |
| 996 | abort (); /* Error - not a valid branch instruction form. */ |
| 997 | |
| 998 | return br_insn; |
| 999 | } |
| 1000 | \f |
| 1001 | static struct coff_link_hash_entry * |
| 1002 | find_thumb_glue (info, name, input_bfd) |
| 1003 | struct bfd_link_info * info; |
| 1004 | CONST char * name; |
| 1005 | bfd * input_bfd; |
| 1006 | { |
| 1007 | char * tmp_name; |
| 1008 | struct coff_link_hash_entry * myh; |
| 1009 | |
| 1010 | tmp_name = ((char *) |
| 1011 | bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1)); |
| 1012 | |
| 1013 | BFD_ASSERT (tmp_name); |
| 1014 | |
| 1015 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); |
| 1016 | |
| 1017 | myh = coff_link_hash_lookup |
| 1018 | (coff_hash_table (info), tmp_name, false, false, true); |
| 1019 | |
| 1020 | if (myh == NULL) |
| 1021 | /* xgettext:c-format */ |
| 1022 | _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"), |
| 1023 | bfd_get_filename (input_bfd), tmp_name, name); |
| 1024 | |
| 1025 | free (tmp_name); |
| 1026 | |
| 1027 | return myh; |
| 1028 | } |
| 1029 | |
| 1030 | static struct coff_link_hash_entry * |
| 1031 | find_arm_glue (info, name, input_bfd) |
| 1032 | struct bfd_link_info * info; |
| 1033 | CONST char * name; |
| 1034 | bfd * input_bfd; |
| 1035 | { |
| 1036 | char * tmp_name; |
| 1037 | struct coff_link_hash_entry * myh; |
| 1038 | |
| 1039 | tmp_name = ((char *) |
| 1040 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); |
| 1041 | |
| 1042 | BFD_ASSERT (tmp_name); |
| 1043 | |
| 1044 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); |
| 1045 | |
| 1046 | myh = coff_link_hash_lookup |
| 1047 | (coff_hash_table (info), tmp_name, false, false, true); |
| 1048 | |
| 1049 | if (myh == NULL) |
| 1050 | /* xgettext:c-format */ |
| 1051 | _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"), |
| 1052 | bfd_get_filename (input_bfd), tmp_name, name); |
| 1053 | |
| 1054 | free (tmp_name); |
| 1055 | |
| 1056 | return myh; |
| 1057 | } |
| 1058 | |
| 1059 | /* |
| 1060 | ARM->Thumb glue: |
| 1061 | |
| 1062 | .arm |
| 1063 | __func_from_arm: |
| 1064 | ldr r12, __func_addr |
| 1065 | bx r12 |
| 1066 | __func_addr: |
| 1067 | .word func @ behave as if you saw a ARM_32 reloc |
| 1068 | */ |
| 1069 | |
| 1070 | #define ARM2THUMB_GLUE_SIZE 12 |
| 1071 | static const insn32 a2t1_ldr_insn = 0xe59fc000; |
| 1072 | static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; |
| 1073 | static const insn32 a2t3_func_addr_insn = 0x00000001; |
| 1074 | |
| 1075 | /* |
| 1076 | Thumb->ARM: Thumb->(non-interworking aware) ARM |
| 1077 | |
| 1078 | .thumb .thumb |
| 1079 | .align 2 .align 2 |
| 1080 | __func_from_thumb: __func_from_thumb: |
| 1081 | bx pc push {r6, lr} |
| 1082 | nop ldr r6, __func_addr |
| 1083 | .arm mov lr, pc |
| 1084 | __func_change_to_arm: bx r6 |
| 1085 | b func .arm |
| 1086 | __func_back_to_thumb: |
| 1087 | ldmia r13! {r6, lr} |
| 1088 | bx lr |
| 1089 | __func_addr: |
| 1090 | .word func |
| 1091 | */ |
| 1092 | |
| 1093 | #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8) |
| 1094 | static const insn16 t2a1_bx_pc_insn = 0x4778; |
| 1095 | static const insn16 t2a2_noop_insn = 0x46c0; |
| 1096 | static const insn32 t2a3_b_insn = 0xea000000; |
| 1097 | |
| 1098 | static const insn16 t2a1_push_insn = 0xb540; |
| 1099 | static const insn16 t2a2_ldr_insn = 0x4e03; |
| 1100 | static const insn16 t2a3_mov_insn = 0x46fe; |
| 1101 | static const insn16 t2a4_bx_insn = 0x4730; |
| 1102 | static const insn32 t2a5_pop_insn = 0xe8bd4040; |
| 1103 | static const insn32 t2a6_bx_insn = 0xe12fff1e; |
| 1104 | |
| 1105 | /* TODO: |
| 1106 | We should really create new local (static) symbols in destination |
| 1107 | object for each stub we create. We should also create local |
| 1108 | (static) symbols within the stubs when switching between ARM and |
| 1109 | Thumb code. This will ensure that the debugger and disassembler |
| 1110 | can present a better view of stubs. |
| 1111 | |
| 1112 | We can treat stubs like literal sections, and for the THUMB9 ones |
| 1113 | (short addressing range) we should be able to insert the stubs |
| 1114 | between sections. i.e. the simplest approach (since relocations |
| 1115 | are done on a section basis) is to dump the stubs at the end of |
| 1116 | processing a section. That way we can always try and minimise the |
| 1117 | offset to and from a stub. However, this does not map well onto |
| 1118 | the way that the linker/BFD does its work: mapping all input |
| 1119 | sections to output sections via the linker script before doing |
| 1120 | all the processing. |
| 1121 | |
| 1122 | Unfortunately it may be easier to just to disallow short range |
| 1123 | Thumb->ARM stubs (i.e. no conditional inter-working branches, |
| 1124 | only branch-and-link (BL) calls. This will simplify the processing |
| 1125 | since we can then put all of the stubs into their own section. |
| 1126 | |
| 1127 | TODO: |
| 1128 | On a different subject, rather than complaining when a |
| 1129 | branch cannot fit in the number of bits available for the |
| 1130 | instruction we should generate a trampoline stub (needed to |
| 1131 | address the complete 32bit address space). */ |
| 1132 | |
| 1133 | /* The standard COFF backend linker does not cope with the special |
| 1134 | Thumb BRANCH23 relocation. The alternative would be to split the |
| 1135 | BRANCH23 into seperate HI23 and LO23 relocations. However, it is a |
| 1136 | bit simpler simply providing our own relocation driver. */ |
| 1137 | |
| 1138 | /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE: |
| 1139 | This code is a very slightly modified copy of |
| 1140 | _bfd_coff_generic_relocate_section. It would be a much more |
| 1141 | maintainable solution to have a MACRO that could be expanded within |
| 1142 | _bfd_coff_generic_relocate_section that would only be provided for |
| 1143 | ARM/Thumb builds. It is only the code marked THUMBEXTENSION that |
| 1144 | is different from the original. */ |
| 1145 | |
| 1146 | static boolean |
| 1147 | coff_arm_relocate_section (output_bfd, info, input_bfd, input_section, |
| 1148 | contents, relocs, syms, sections) |
| 1149 | bfd *output_bfd; |
| 1150 | struct bfd_link_info *info; |
| 1151 | bfd *input_bfd; |
| 1152 | asection *input_section; |
| 1153 | bfd_byte *contents; |
| 1154 | struct internal_reloc *relocs; |
| 1155 | struct internal_syment *syms; |
| 1156 | asection **sections; |
| 1157 | { |
| 1158 | struct internal_reloc * rel; |
| 1159 | struct internal_reloc * relend; |
| 1160 | |
| 1161 | rel = relocs; |
| 1162 | relend = rel + input_section->reloc_count; |
| 1163 | |
| 1164 | for (; rel < relend; rel++) |
| 1165 | { |
| 1166 | int done = 0; |
| 1167 | long symndx; |
| 1168 | struct coff_link_hash_entry * h; |
| 1169 | struct internal_syment * sym; |
| 1170 | bfd_vma addend; |
| 1171 | bfd_vma val; |
| 1172 | reloc_howto_type * howto; |
| 1173 | bfd_reloc_status_type rstat; |
| 1174 | bfd_vma h_val; |
| 1175 | |
| 1176 | symndx = rel->r_symndx; |
| 1177 | |
| 1178 | if (symndx == -1) |
| 1179 | { |
| 1180 | h = NULL; |
| 1181 | sym = NULL; |
| 1182 | } |
| 1183 | else |
| 1184 | { |
| 1185 | h = obj_coff_sym_hashes (input_bfd)[symndx]; |
| 1186 | sym = syms + symndx; |
| 1187 | } |
| 1188 | |
| 1189 | /* COFF treats common symbols in one of two ways. Either the |
| 1190 | size of the symbol is included in the section contents, or it |
| 1191 | is not. We assume that the size is not included, and force |
| 1192 | the rtype_to_howto function to adjust the addend as needed. */ |
| 1193 | |
| 1194 | if (sym != NULL && sym->n_scnum != 0) |
| 1195 | addend = - sym->n_value; |
| 1196 | else |
| 1197 | addend = 0; |
| 1198 | |
| 1199 | howto = coff_rtype_to_howto (input_bfd, input_section, rel, h, |
| 1200 | sym, &addend); |
| 1201 | if (howto == NULL) |
| 1202 | return false; |
| 1203 | |
| 1204 | /* The relocation_section function will skip pcrel_offset relocs |
| 1205 | when doing a relocateable link. However, we want to convert |
| 1206 | ARM26 to ARM26D relocs if possible. We return a fake howto in |
| 1207 | this case without pcrel_offset set, and adjust the addend to |
| 1208 | compensate. */ |
| 1209 | if (rel->r_type == ARM_26 |
| 1210 | && h != NULL |
| 1211 | && info->relocateable |
| 1212 | && (h->root.type == bfd_link_hash_defined |
| 1213 | || h->root.type == bfd_link_hash_defweak) |
| 1214 | && h->root.u.def.section->output_section == input_section->output_section) |
| 1215 | { |
| 1216 | static reloc_howto_type fake_arm26_reloc = |
| 1217 | HOWTO (ARM_26, |
| 1218 | 2, |
| 1219 | 2, |
| 1220 | 24, |
| 1221 | true, |
| 1222 | 0, |
| 1223 | complain_overflow_signed, |
| 1224 | aoutarm_fix_pcrel_26 , |
| 1225 | "ARM_26", |
| 1226 | false, |
| 1227 | 0x00ffffff, |
| 1228 | 0x00ffffff, |
| 1229 | false); |
| 1230 | |
| 1231 | addend -= rel->r_vaddr - input_section->vma; |
| 1232 | howto = &fake_arm26_reloc; |
| 1233 | } |
| 1234 | |
| 1235 | #ifdef ARM_WINCE |
| 1236 | /* MS ARM-CE makes the reloc relative to the opcode's pc, not |
| 1237 | the next opcode's pc, so is off by one. */ |
| 1238 | if (howto->pc_relative && !info->relocateable) |
| 1239 | addend -= 8; |
| 1240 | #endif |
| 1241 | |
| 1242 | /* If we are doing a relocateable link, then we can just ignore |
| 1243 | a PC relative reloc that is pcrel_offset. It will already |
| 1244 | have the correct value. If this is not a relocateable link, |
| 1245 | then we should ignore the symbol value. */ |
| 1246 | if (howto->pc_relative && howto->pcrel_offset) |
| 1247 | { |
| 1248 | if (info->relocateable) |
| 1249 | continue; |
| 1250 | /* FIXME - it is not clear which targets need this next test |
| 1251 | and which do not. It is known that it is needed for the |
| 1252 | VxWorks and EPOC-PE targets, but it is also known that it |
| 1253 | was supressed for other ARM targets. This ought to be |
| 1254 | sorted out one day. */ |
| 1255 | #ifdef ARM_COFF_BUGFIX |
| 1256 | /* We must not ignore the symbol value. If the symbol is |
| 1257 | within the same section, the relocation should have already |
| 1258 | been fixed, but if it is not, we'll be handed a reloc into |
| 1259 | the beginning of the symbol's section, so we must not cancel |
| 1260 | out the symbol's value, otherwise we'll be adding it in |
| 1261 | twice. */ |
| 1262 | if (sym != NULL && sym->n_scnum != 0) |
| 1263 | addend += sym->n_value; |
| 1264 | #endif |
| 1265 | } |
| 1266 | |
| 1267 | val = 0; |
| 1268 | |
| 1269 | if (h == NULL) |
| 1270 | { |
| 1271 | asection *sec; |
| 1272 | |
| 1273 | if (symndx == -1) |
| 1274 | { |
| 1275 | sec = bfd_abs_section_ptr; |
| 1276 | val = 0; |
| 1277 | } |
| 1278 | else |
| 1279 | { |
| 1280 | sec = sections[symndx]; |
| 1281 | val = (sec->output_section->vma |
| 1282 | + sec->output_offset |
| 1283 | + sym->n_value |
| 1284 | - sec->vma); |
| 1285 | } |
| 1286 | } |
| 1287 | else |
| 1288 | { |
| 1289 | #if 1 /* THUMBEXTENSION */ |
| 1290 | /* We don't output the stubs if we are generating a |
| 1291 | relocatable output file, since we may as well leave the |
| 1292 | stub generation to the final linker pass. If we fail to |
| 1293 | verify that the name is defined, we'll try to build stubs |
| 1294 | for an undefined name... */ |
| 1295 | if (! info->relocateable |
| 1296 | && ( h->root.type == bfd_link_hash_defined |
| 1297 | || h->root.type == bfd_link_hash_defweak)) |
| 1298 | { |
| 1299 | asection * h_sec = h->root.u.def.section; |
| 1300 | const char * name = h->root.root.string; |
| 1301 | |
| 1302 | /* h locates the symbol referenced in the reloc. */ |
| 1303 | h_val = (h->root.u.def.value |
| 1304 | + h_sec->output_section->vma |
| 1305 | + h_sec->output_offset); |
| 1306 | |
| 1307 | if (howto->type == ARM_26) |
| 1308 | { |
| 1309 | if ( h->class == C_THUMBSTATFUNC |
| 1310 | || h->class == C_THUMBEXTFUNC) |
| 1311 | { |
| 1312 | /* Arm code calling a Thumb function. */ |
| 1313 | unsigned long int tmp; |
| 1314 | long int my_offset; |
| 1315 | asection * s; |
| 1316 | long int ret_offset; |
| 1317 | struct coff_link_hash_entry * myh; |
| 1318 | struct coff_arm_link_hash_table * globals; |
| 1319 | |
| 1320 | myh = find_arm_glue (info, name, input_bfd); |
| 1321 | if (myh == NULL) |
| 1322 | return false; |
| 1323 | |
| 1324 | globals = coff_arm_hash_table (info); |
| 1325 | |
| 1326 | BFD_ASSERT (globals != NULL); |
| 1327 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1328 | |
| 1329 | my_offset = myh->root.u.def.value; |
| 1330 | |
| 1331 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, |
| 1332 | ARM2THUMB_GLUE_SECTION_NAME); |
| 1333 | BFD_ASSERT (s != NULL); |
| 1334 | BFD_ASSERT (s->contents != NULL); |
| 1335 | BFD_ASSERT (s->output_section != NULL); |
| 1336 | |
| 1337 | if ((my_offset & 0x01) == 0x01) |
| 1338 | { |
| 1339 | if (h_sec->owner != NULL |
| 1340 | && INTERWORK_SET (h_sec->owner) |
| 1341 | && ! INTERWORK_FLAG (h_sec->owner)) |
| 1342 | { |
| 1343 | _bfd_error_handler |
| 1344 | /* xgettext:c-format */ |
| 1345 | (_("%s(%s): warning: interworking not enabled."), |
| 1346 | bfd_get_filename (h_sec->owner), name); |
| 1347 | _bfd_error_handler |
| 1348 | /* xgettext:c-format */ |
| 1349 | (_(" first occurrence: %s: arm call to thumb"), |
| 1350 | bfd_get_filename (input_bfd)); |
| 1351 | } |
| 1352 | |
| 1353 | --my_offset; |
| 1354 | myh->root.u.def.value = my_offset; |
| 1355 | |
| 1356 | bfd_put_32 (output_bfd, a2t1_ldr_insn, |
| 1357 | s->contents + my_offset); |
| 1358 | |
| 1359 | bfd_put_32 (output_bfd, a2t2_bx_r12_insn, |
| 1360 | s->contents + my_offset + 4); |
| 1361 | |
| 1362 | /* It's a thumb address. Add the low order bit. */ |
| 1363 | bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn, |
| 1364 | s->contents + my_offset + 8); |
| 1365 | |
| 1366 | if (info->base_file) |
| 1367 | arm_emit_base_file_entry (info, output_bfd, s, |
| 1368 | my_offset + 8); |
| 1369 | |
| 1370 | } |
| 1371 | |
| 1372 | BFD_ASSERT (my_offset <= globals->arm_glue_size); |
| 1373 | |
| 1374 | tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr |
| 1375 | - input_section->vma); |
| 1376 | |
| 1377 | tmp = tmp & 0xFF000000; |
| 1378 | |
| 1379 | /* Somehow these are both 4 too far, so subtract 8. */ |
| 1380 | ret_offset = |
| 1381 | s->output_offset |
| 1382 | + my_offset |
| 1383 | + s->output_section->vma |
| 1384 | - (input_section->output_offset |
| 1385 | + input_section->output_section->vma |
| 1386 | + rel->r_vaddr) |
| 1387 | - 8; |
| 1388 | |
| 1389 | tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); |
| 1390 | |
| 1391 | bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr |
| 1392 | - input_section->vma); |
| 1393 | done = 1; |
| 1394 | } |
| 1395 | } |
| 1396 | |
| 1397 | #ifndef ARM_WINCE |
| 1398 | /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */ |
| 1399 | else if (howto->type == ARM_THUMB23) |
| 1400 | { |
| 1401 | if ( h->class == C_EXT |
| 1402 | || h->class == C_STAT |
| 1403 | || h->class == C_LABEL) |
| 1404 | { |
| 1405 | /* Thumb code calling an ARM function */ |
| 1406 | asection * s = 0; |
| 1407 | long int my_offset; |
| 1408 | unsigned long int tmp; |
| 1409 | long int ret_offset; |
| 1410 | struct coff_link_hash_entry * myh; |
| 1411 | struct coff_arm_link_hash_table * globals; |
| 1412 | |
| 1413 | myh = find_thumb_glue (info, name, input_bfd); |
| 1414 | if (myh == NULL) |
| 1415 | return false; |
| 1416 | |
| 1417 | globals = coff_arm_hash_table (info); |
| 1418 | |
| 1419 | BFD_ASSERT (globals != NULL); |
| 1420 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1421 | |
| 1422 | my_offset = myh->root.u.def.value; |
| 1423 | |
| 1424 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, |
| 1425 | THUMB2ARM_GLUE_SECTION_NAME); |
| 1426 | |
| 1427 | BFD_ASSERT (s != NULL); |
| 1428 | BFD_ASSERT (s->contents != NULL); |
| 1429 | BFD_ASSERT (s->output_section != NULL); |
| 1430 | |
| 1431 | if ((my_offset & 0x01) == 0x01) |
| 1432 | { |
| 1433 | if (h_sec->owner != NULL |
| 1434 | && INTERWORK_SET (h_sec->owner) |
| 1435 | && ! INTERWORK_FLAG (h_sec->owner) |
| 1436 | && ! globals->support_old_code) |
| 1437 | { |
| 1438 | _bfd_error_handler |
| 1439 | /* xgettext:c-format */ |
| 1440 | (_("%s(%s): warning: interworking not enabled."), |
| 1441 | bfd_get_filename (h_sec->owner), name); |
| 1442 | _bfd_error_handler |
| 1443 | /* xgettext:c-format */ |
| 1444 | (_(" first occurrence: %s: thumb call to arm"), |
| 1445 | bfd_get_filename (input_bfd)); |
| 1446 | _bfd_error_handler |
| 1447 | (_(" consider relinking with --support-old-code enabled")); |
| 1448 | } |
| 1449 | |
| 1450 | -- my_offset; |
| 1451 | myh->root.u.def.value = my_offset; |
| 1452 | |
| 1453 | if (globals->support_old_code) |
| 1454 | { |
| 1455 | bfd_put_16 (output_bfd, t2a1_push_insn, |
| 1456 | s->contents + my_offset); |
| 1457 | |
| 1458 | bfd_put_16 (output_bfd, t2a2_ldr_insn, |
| 1459 | s->contents + my_offset + 2); |
| 1460 | |
| 1461 | bfd_put_16 (output_bfd, t2a3_mov_insn, |
| 1462 | s->contents + my_offset + 4); |
| 1463 | |
| 1464 | bfd_put_16 (output_bfd, t2a4_bx_insn, |
| 1465 | s->contents + my_offset + 6); |
| 1466 | |
| 1467 | bfd_put_32 (output_bfd, t2a5_pop_insn, |
| 1468 | s->contents + my_offset + 8); |
| 1469 | |
| 1470 | bfd_put_32 (output_bfd, t2a6_bx_insn, |
| 1471 | s->contents + my_offset + 12); |
| 1472 | |
| 1473 | /* Store the address of the function in the last word of the stub. */ |
| 1474 | bfd_put_32 (output_bfd, h_val, |
| 1475 | s->contents + my_offset + 16); |
| 1476 | |
| 1477 | if (info->base_file) |
| 1478 | arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16); |
| 1479 | } |
| 1480 | else |
| 1481 | { |
| 1482 | bfd_put_16 (output_bfd, t2a1_bx_pc_insn, |
| 1483 | s->contents + my_offset); |
| 1484 | |
| 1485 | bfd_put_16 (output_bfd, t2a2_noop_insn, |
| 1486 | s->contents + my_offset + 2); |
| 1487 | |
| 1488 | ret_offset = |
| 1489 | ((bfd_signed_vma) h_val) /* Address of destination of the stub. */ |
| 1490 | - ((bfd_signed_vma) |
| 1491 | (s->output_offset /* Offset from the start of the current section to the start of the stubs. */ |
| 1492 | + my_offset /* Offset of the start of this stub from the start of the stubs. */ |
| 1493 | + s->output_section->vma) /* Address of the start of the current section. */ |
| 1494 | + 4 /* The branch instruction is 4 bytes into the stub. */ |
| 1495 | + 8); /* ARM branches work from the pc of the instruction + 8. */ |
| 1496 | |
| 1497 | bfd_put_32 (output_bfd, |
| 1498 | t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), |
| 1499 | s->contents + my_offset + 4); |
| 1500 | |
| 1501 | } |
| 1502 | } |
| 1503 | |
| 1504 | BFD_ASSERT (my_offset <= globals->thumb_glue_size); |
| 1505 | |
| 1506 | /* Now go back and fix up the original BL insn to point |
| 1507 | to here. */ |
| 1508 | ret_offset = |
| 1509 | s->output_offset |
| 1510 | + my_offset |
| 1511 | - (input_section->output_offset |
| 1512 | + rel->r_vaddr) |
| 1513 | -4; |
| 1514 | |
| 1515 | tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr |
| 1516 | - input_section->vma); |
| 1517 | |
| 1518 | bfd_put_32 (output_bfd, |
| 1519 | insert_thumb_branch (tmp, ret_offset), |
| 1520 | contents + rel->r_vaddr |
| 1521 | - input_section->vma); |
| 1522 | |
| 1523 | done = 1; |
| 1524 | } |
| 1525 | } |
| 1526 | #endif |
| 1527 | } |
| 1528 | |
| 1529 | /* If the relocation type and destination symbol does not |
| 1530 | fall into one of the above categories, then we can just |
| 1531 | perform a direct link. */ |
| 1532 | |
| 1533 | if (done) |
| 1534 | rstat = bfd_reloc_ok; |
| 1535 | else |
| 1536 | #endif /* THUMBEXTENSION */ |
| 1537 | if ( h->root.type == bfd_link_hash_defined |
| 1538 | || h->root.type == bfd_link_hash_defweak) |
| 1539 | { |
| 1540 | asection *sec; |
| 1541 | |
| 1542 | sec = h->root.u.def.section; |
| 1543 | val = (h->root.u.def.value |
| 1544 | + sec->output_section->vma |
| 1545 | + sec->output_offset); |
| 1546 | } |
| 1547 | |
| 1548 | else if (! info->relocateable) |
| 1549 | { |
| 1550 | if (! ((*info->callbacks->undefined_symbol) |
| 1551 | (info, h->root.root.string, input_bfd, input_section, |
| 1552 | rel->r_vaddr - input_section->vma, true))) |
| 1553 | return false; |
| 1554 | } |
| 1555 | } |
| 1556 | |
| 1557 | if (info->base_file) |
| 1558 | { |
| 1559 | /* Emit a reloc if the backend thinks it needs it. */ |
| 1560 | if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto)) |
| 1561 | arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr); |
| 1562 | } |
| 1563 | |
| 1564 | #if 1 /* THUMBEXTENSION */ |
| 1565 | if (done) |
| 1566 | rstat = bfd_reloc_ok; |
| 1567 | #ifndef ARM_WINCE |
| 1568 | /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */ |
| 1569 | else if (! info->relocateable |
| 1570 | && howto->type == ARM_THUMB23) |
| 1571 | { |
| 1572 | /* This is pretty much a copy of what the default |
| 1573 | _bfd_final_link_relocate and _bfd_relocate_contents |
| 1574 | routines do to perform a relocation, with special |
| 1575 | processing for the split addressing of the Thumb BL |
| 1576 | instruction. Again, it would probably be simpler adding a |
| 1577 | ThumbBRANCH23 specific macro expansion into the default |
| 1578 | code. */ |
| 1579 | |
| 1580 | bfd_vma address = rel->r_vaddr - input_section->vma; |
| 1581 | |
| 1582 | if (address > input_section->_raw_size) |
| 1583 | rstat = bfd_reloc_outofrange; |
| 1584 | else |
| 1585 | { |
| 1586 | bfd_vma relocation = val + addend; |
| 1587 | int size = bfd_get_reloc_size (howto); |
| 1588 | boolean overflow = false; |
| 1589 | bfd_byte * location = contents + address; |
| 1590 | bfd_vma x = bfd_get_32 (input_bfd, location); |
| 1591 | bfd_vma src_mask = 0x007FFFFE; |
| 1592 | bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; |
| 1593 | bfd_signed_vma reloc_signed_min = ~reloc_signed_max; |
| 1594 | bfd_vma check; |
| 1595 | bfd_signed_vma signed_check; |
| 1596 | bfd_vma add; |
| 1597 | bfd_signed_vma signed_add; |
| 1598 | |
| 1599 | BFD_ASSERT (size == 4); |
| 1600 | |
| 1601 | /* howto->pc_relative should be TRUE for type 14 BRANCH23. */ |
| 1602 | relocation -= (input_section->output_section->vma |
| 1603 | + input_section->output_offset); |
| 1604 | |
| 1605 | /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */ |
| 1606 | relocation -= address; |
| 1607 | |
| 1608 | /* No need to negate the relocation with BRANCH23. */ |
| 1609 | /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */ |
| 1610 | /* howto->rightshift == 1 */ |
| 1611 | |
| 1612 | /* Drop unwanted bits from the value we are relocating to. */ |
| 1613 | check = relocation >> howto->rightshift; |
| 1614 | |
| 1615 | /* If this is a signed value, the rightshift just dropped |
| 1616 | leading 1 bits (assuming twos complement). */ |
| 1617 | if ((bfd_signed_vma) relocation >= 0) |
| 1618 | signed_check = check; |
| 1619 | else |
| 1620 | signed_check = (check |
| 1621 | | ((bfd_vma) - 1 |
| 1622 | & ~((bfd_vma) - 1 >> howto->rightshift))); |
| 1623 | |
| 1624 | /* Get the value from the object file. */ |
| 1625 | if (bfd_big_endian (input_bfd)) |
| 1626 | add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1); |
| 1627 | else |
| 1628 | add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15)); |
| 1629 | |
| 1630 | /* Get the value from the object file with an appropriate sign. |
| 1631 | The expression involving howto->src_mask isolates the upper |
| 1632 | bit of src_mask. If that bit is set in the value we are |
| 1633 | adding, it is negative, and we subtract out that number times |
| 1634 | two. If src_mask includes the highest possible bit, then we |
| 1635 | can not get the upper bit, but that does not matter since |
| 1636 | signed_add needs no adjustment to become negative in that |
| 1637 | case. */ |
| 1638 | signed_add = add; |
| 1639 | |
| 1640 | if ((add & (((~ src_mask) >> 1) & src_mask)) != 0) |
| 1641 | signed_add -= (((~ src_mask) >> 1) & src_mask) << 1; |
| 1642 | |
| 1643 | /* howto->bitpos == 0 */ |
| 1644 | /* Add the value from the object file, shifted so that it is a |
| 1645 | straight number. */ |
| 1646 | signed_check += signed_add; |
| 1647 | relocation += signed_add; |
| 1648 | |
| 1649 | BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed); |
| 1650 | |
| 1651 | /* Assumes two's complement. */ |
| 1652 | if ( signed_check > reloc_signed_max |
| 1653 | || signed_check < reloc_signed_min) |
| 1654 | overflow = true; |
| 1655 | |
| 1656 | /* For the BLX(1) instruction remove bit 0 of the adjusted offset. |
| 1657 | Bit 0 can only be set if the upper insn is at a half-word boundary, |
| 1658 | since the destination address, an ARM instruction, must always be |
| 1659 | on a word boundary. The semantics of the BLX (1) instruction, |
| 1660 | however, are that bit 0 in the offset must always be 0, and the |
| 1661 | corresponding bit 1 in the target address will be set from bit |
| 1662 | 1 of the source address. */ |
| 1663 | if ((x & 0x18000000) == 0x08000000) |
| 1664 | relocation &= ~0x2; |
| 1665 | |
| 1666 | /* Put the relocation into the correct bits. */ |
| 1667 | if (bfd_big_endian (input_bfd)) |
| 1668 | relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000)); |
| 1669 | else |
| 1670 | relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff)); |
| 1671 | |
| 1672 | /* Add the relocation to the correct bits of X. */ |
| 1673 | x = ((x & ~howto->dst_mask) | relocation); |
| 1674 | |
| 1675 | /* Put the relocated value back in the object file. */ |
| 1676 | bfd_put_32 (input_bfd, x, location); |
| 1677 | |
| 1678 | rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok; |
| 1679 | } |
| 1680 | } |
| 1681 | #endif |
| 1682 | else |
| 1683 | #endif /* THUMBEXTENSION */ |
| 1684 | rstat = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1685 | contents, |
| 1686 | rel->r_vaddr - input_section->vma, |
| 1687 | val, addend); |
| 1688 | #if 1 /* THUMBEXTENSION */ |
| 1689 | /* FIXME: |
| 1690 | Is this the best way to fix up thumb addresses? krk@cygnus.com |
| 1691 | Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */ |
| 1692 | /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */ |
| 1693 | if (! info->relocateable |
| 1694 | && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32)) |
| 1695 | { |
| 1696 | /* Determine if we need to set the bottom bit of a relocated address |
| 1697 | because the address is the address of a Thumb code symbol. */ |
| 1698 | |
| 1699 | int patchit = false; |
| 1700 | |
| 1701 | if (h != NULL |
| 1702 | && ( h->class == C_THUMBSTATFUNC |
| 1703 | || h->class == C_THUMBEXTFUNC)) |
| 1704 | { |
| 1705 | patchit = true; |
| 1706 | } |
| 1707 | else if (sym != NULL |
| 1708 | && sym->n_scnum > N_UNDEF) |
| 1709 | { |
| 1710 | /* No hash entry - use the symbol instead. */ |
| 1711 | |
| 1712 | if ( sym->n_sclass == C_THUMBSTATFUNC |
| 1713 | || sym->n_sclass == C_THUMBEXTFUNC) |
| 1714 | patchit = true; |
| 1715 | } |
| 1716 | |
| 1717 | if (patchit) |
| 1718 | { |
| 1719 | bfd_byte * location = contents + rel->r_vaddr - input_section->vma; |
| 1720 | bfd_vma x = bfd_get_32 (input_bfd, location); |
| 1721 | |
| 1722 | bfd_put_32 (input_bfd, x | 1, location); |
| 1723 | } |
| 1724 | } |
| 1725 | #endif /* THUMBEXTENSION */ |
| 1726 | |
| 1727 | switch (rstat) |
| 1728 | { |
| 1729 | default: |
| 1730 | abort (); |
| 1731 | case bfd_reloc_ok: |
| 1732 | break; |
| 1733 | case bfd_reloc_outofrange: |
| 1734 | (*_bfd_error_handler) |
| 1735 | (_("%s: bad reloc address 0x%lx in section `%s'"), |
| 1736 | bfd_get_filename (input_bfd), |
| 1737 | (unsigned long) rel->r_vaddr, |
| 1738 | bfd_get_section_name (input_bfd, input_section)); |
| 1739 | return false; |
| 1740 | case bfd_reloc_overflow: |
| 1741 | { |
| 1742 | const char *name; |
| 1743 | char buf[SYMNMLEN + 1]; |
| 1744 | |
| 1745 | if (symndx == -1) |
| 1746 | name = "*ABS*"; |
| 1747 | else if (h != NULL) |
| 1748 | name = h->root.root.string; |
| 1749 | else |
| 1750 | { |
| 1751 | name = _bfd_coff_internal_syment_name (input_bfd, sym, buf); |
| 1752 | if (name == NULL) |
| 1753 | return false; |
| 1754 | } |
| 1755 | |
| 1756 | if (! ((*info->callbacks->reloc_overflow) |
| 1757 | (info, name, howto->name, (bfd_vma) 0, input_bfd, |
| 1758 | input_section, rel->r_vaddr - input_section->vma))) |
| 1759 | return false; |
| 1760 | } |
| 1761 | } |
| 1762 | } |
| 1763 | |
| 1764 | return true; |
| 1765 | } |
| 1766 | |
| 1767 | #ifndef COFF_IMAGE_WITH_PE |
| 1768 | |
| 1769 | boolean |
| 1770 | bfd_arm_allocate_interworking_sections (info) |
| 1771 | struct bfd_link_info * info; |
| 1772 | { |
| 1773 | asection * s; |
| 1774 | bfd_byte * foo; |
| 1775 | struct coff_arm_link_hash_table * globals; |
| 1776 | #if 0 |
| 1777 | static char test_char = '1'; |
| 1778 | #endif |
| 1779 | |
| 1780 | globals = coff_arm_hash_table (info); |
| 1781 | |
| 1782 | BFD_ASSERT (globals != NULL); |
| 1783 | |
| 1784 | if (globals->arm_glue_size != 0) |
| 1785 | { |
| 1786 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1787 | |
| 1788 | s = bfd_get_section_by_name |
| 1789 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); |
| 1790 | |
| 1791 | BFD_ASSERT (s != NULL); |
| 1792 | |
| 1793 | foo = (bfd_byte *) bfd_alloc |
| 1794 | (globals->bfd_of_glue_owner, globals->arm_glue_size); |
| 1795 | #if 0 |
| 1796 | memset (foo, test_char, globals->arm_glue_size); |
| 1797 | #endif |
| 1798 | |
| 1799 | s->_raw_size = s->_cooked_size = globals->arm_glue_size; |
| 1800 | s->contents = foo; |
| 1801 | } |
| 1802 | |
| 1803 | if (globals->thumb_glue_size != 0) |
| 1804 | { |
| 1805 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1806 | |
| 1807 | s = bfd_get_section_by_name |
| 1808 | (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); |
| 1809 | |
| 1810 | BFD_ASSERT (s != NULL); |
| 1811 | |
| 1812 | foo = (bfd_byte *) bfd_alloc |
| 1813 | (globals->bfd_of_glue_owner, globals->thumb_glue_size); |
| 1814 | #if 0 |
| 1815 | memset (foo, test_char, globals->thumb_glue_size); |
| 1816 | #endif |
| 1817 | |
| 1818 | s->_raw_size = s->_cooked_size = globals->thumb_glue_size; |
| 1819 | s->contents = foo; |
| 1820 | } |
| 1821 | |
| 1822 | return true; |
| 1823 | } |
| 1824 | |
| 1825 | static void |
| 1826 | record_arm_to_thumb_glue (info, h) |
| 1827 | struct bfd_link_info * info; |
| 1828 | struct coff_link_hash_entry * h; |
| 1829 | { |
| 1830 | const char * name = h->root.root.string; |
| 1831 | register asection * s; |
| 1832 | char * tmp_name; |
| 1833 | struct coff_link_hash_entry * myh; |
| 1834 | struct coff_arm_link_hash_table * globals; |
| 1835 | |
| 1836 | globals = coff_arm_hash_table (info); |
| 1837 | |
| 1838 | BFD_ASSERT (globals != NULL); |
| 1839 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1840 | |
| 1841 | s = bfd_get_section_by_name |
| 1842 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); |
| 1843 | |
| 1844 | BFD_ASSERT (s != NULL); |
| 1845 | |
| 1846 | tmp_name = ((char *) |
| 1847 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); |
| 1848 | |
| 1849 | BFD_ASSERT (tmp_name); |
| 1850 | |
| 1851 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); |
| 1852 | |
| 1853 | myh = coff_link_hash_lookup |
| 1854 | (coff_hash_table (info), tmp_name, false, false, true); |
| 1855 | |
| 1856 | if (myh != NULL) |
| 1857 | { |
| 1858 | free (tmp_name); |
| 1859 | return; /* we've already seen this guy */ |
| 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 | |
| 1866 | bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name, |
| 1867 | BSF_GLOBAL, |
| 1868 | s, globals->arm_glue_size + 1, |
| 1869 | NULL, true, false, |
| 1870 | (struct bfd_link_hash_entry **) & myh); |
| 1871 | |
| 1872 | free (tmp_name); |
| 1873 | |
| 1874 | globals->arm_glue_size += ARM2THUMB_GLUE_SIZE; |
| 1875 | |
| 1876 | return; |
| 1877 | } |
| 1878 | |
| 1879 | static void |
| 1880 | record_thumb_to_arm_glue (info, h) |
| 1881 | struct bfd_link_info * info; |
| 1882 | struct coff_link_hash_entry * h; |
| 1883 | { |
| 1884 | const char * name = h->root.root.string; |
| 1885 | register asection * s; |
| 1886 | char * tmp_name; |
| 1887 | struct coff_link_hash_entry * myh; |
| 1888 | struct coff_arm_link_hash_table * globals; |
| 1889 | |
| 1890 | globals = coff_arm_hash_table (info); |
| 1891 | |
| 1892 | BFD_ASSERT (globals != NULL); |
| 1893 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1894 | |
| 1895 | s = bfd_get_section_by_name |
| 1896 | (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); |
| 1897 | |
| 1898 | BFD_ASSERT (s != NULL); |
| 1899 | |
| 1900 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); |
| 1901 | |
| 1902 | BFD_ASSERT (tmp_name); |
| 1903 | |
| 1904 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); |
| 1905 | |
| 1906 | myh = coff_link_hash_lookup |
| 1907 | (coff_hash_table (info), tmp_name, false, false, true); |
| 1908 | |
| 1909 | if (myh != NULL) |
| 1910 | { |
| 1911 | free (tmp_name); |
| 1912 | return; /* we've already seen this guy */ |
| 1913 | } |
| 1914 | |
| 1915 | bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name, |
| 1916 | BSF_GLOBAL, s, globals->thumb_glue_size + 1, |
| 1917 | NULL, true, false, |
| 1918 | (struct bfd_link_hash_entry **) & myh); |
| 1919 | |
| 1920 | /* If we mark it 'thumb', the disassembler will do a better job. */ |
| 1921 | myh->class = C_THUMBEXTFUNC; |
| 1922 | |
| 1923 | free (tmp_name); |
| 1924 | |
| 1925 | /* Allocate another symbol to mark where we switch to arm mode. */ |
| 1926 | |
| 1927 | #define CHANGE_TO_ARM "__%s_change_to_arm" |
| 1928 | #define BACK_FROM_ARM "__%s_back_from_arm" |
| 1929 | |
| 1930 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1); |
| 1931 | |
| 1932 | BFD_ASSERT (tmp_name); |
| 1933 | |
| 1934 | sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name); |
| 1935 | |
| 1936 | myh = NULL; |
| 1937 | |
| 1938 | bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name, |
| 1939 | BSF_LOCAL, s, globals->thumb_glue_size |
| 1940 | + (globals->support_old_code ? 8 : 4), |
| 1941 | NULL, true, false, |
| 1942 | (struct bfd_link_hash_entry **) & myh); |
| 1943 | |
| 1944 | free (tmp_name); |
| 1945 | |
| 1946 | globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE; |
| 1947 | |
| 1948 | return; |
| 1949 | } |
| 1950 | |
| 1951 | /* Select a BFD to be used to hold the sections used by the glue code. |
| 1952 | This function is called from the linker scripts in ld/emultempl/ |
| 1953 | {armcoff/pe}.em */ |
| 1954 | |
| 1955 | boolean |
| 1956 | bfd_arm_get_bfd_for_interworking (abfd, info) |
| 1957 | bfd * abfd; |
| 1958 | struct bfd_link_info * info; |
| 1959 | { |
| 1960 | struct coff_arm_link_hash_table * globals; |
| 1961 | flagword flags; |
| 1962 | asection * sec; |
| 1963 | |
| 1964 | /* If we are only performing a partial link do not bother |
| 1965 | getting a bfd to hold the glue. */ |
| 1966 | if (info->relocateable) |
| 1967 | return true; |
| 1968 | |
| 1969 | globals = coff_arm_hash_table (info); |
| 1970 | |
| 1971 | BFD_ASSERT (globals != NULL); |
| 1972 | |
| 1973 | if (globals->bfd_of_glue_owner != NULL) |
| 1974 | return true; |
| 1975 | |
| 1976 | sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); |
| 1977 | |
| 1978 | if (sec == NULL) |
| 1979 | { |
| 1980 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; |
| 1981 | |
| 1982 | sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME); |
| 1983 | |
| 1984 | if (sec == NULL |
| 1985 | || ! bfd_set_section_flags (abfd, sec, flags) |
| 1986 | || ! bfd_set_section_alignment (abfd, sec, 2)) |
| 1987 | return false; |
| 1988 | } |
| 1989 | |
| 1990 | sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME); |
| 1991 | |
| 1992 | if (sec == NULL) |
| 1993 | { |
| 1994 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; |
| 1995 | |
| 1996 | sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME); |
| 1997 | |
| 1998 | if (sec == NULL |
| 1999 | || ! bfd_set_section_flags (abfd, sec, flags) |
| 2000 | || ! bfd_set_section_alignment (abfd, sec, 2)) |
| 2001 | return false; |
| 2002 | } |
| 2003 | |
| 2004 | /* Save the bfd for later use. */ |
| 2005 | globals->bfd_of_glue_owner = abfd; |
| 2006 | |
| 2007 | return true; |
| 2008 | } |
| 2009 | |
| 2010 | boolean |
| 2011 | bfd_arm_process_before_allocation (abfd, info, support_old_code) |
| 2012 | 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 (info->relocateable) |
| 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 | |
| 2027 | _bfd_coff_get_external_symbols (abfd); |
| 2028 | |
| 2029 | globals = coff_arm_hash_table (info); |
| 2030 | |
| 2031 | BFD_ASSERT (globals != NULL); |
| 2032 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 2033 | |
| 2034 | globals->support_old_code = support_old_code; |
| 2035 | |
| 2036 | /* Rummage around all the relocs and map the glue vectors. */ |
| 2037 | sec = abfd->sections; |
| 2038 | |
| 2039 | if (sec == NULL) |
| 2040 | return true; |
| 2041 | |
| 2042 | for (; sec != NULL; sec = sec->next) |
| 2043 | { |
| 2044 | struct internal_reloc * i; |
| 2045 | struct internal_reloc * rel; |
| 2046 | |
| 2047 | if (sec->reloc_count == 0) |
| 2048 | continue; |
| 2049 | |
| 2050 | /* Load the relocs. */ |
| 2051 | /* FIXME: there may be a storage leak here. */ |
| 2052 | |
| 2053 | i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0); |
| 2054 | |
| 2055 | BFD_ASSERT (i != 0); |
| 2056 | |
| 2057 | for (rel = i; rel < i + sec->reloc_count; ++rel) |
| 2058 | { |
| 2059 | unsigned short r_type = rel->r_type; |
| 2060 | long symndx; |
| 2061 | struct coff_link_hash_entry * h; |
| 2062 | |
| 2063 | symndx = rel->r_symndx; |
| 2064 | |
| 2065 | /* If the relocation is not against a symbol it cannot concern us. */ |
| 2066 | if (symndx == -1) |
| 2067 | continue; |
| 2068 | |
| 2069 | /* If the index is outside of the range of our table, something has gone wrong. */ |
| 2070 | if (symndx >= obj_conv_table_size (abfd)) |
| 2071 | { |
| 2072 | _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"), |
| 2073 | bfd_get_filename (abfd), symndx); |
| 2074 | continue; |
| 2075 | } |
| 2076 | |
| 2077 | h = obj_coff_sym_hashes (abfd)[symndx]; |
| 2078 | |
| 2079 | /* If the relocation is against a static symbol it must be within |
| 2080 | the current section and so cannot be a cross ARM/Thumb relocation. */ |
| 2081 | if (h == NULL) |
| 2082 | continue; |
| 2083 | |
| 2084 | switch (r_type) |
| 2085 | { |
| 2086 | case ARM_26: |
| 2087 | /* This one is a call from arm code. We need to look up |
| 2088 | the target of the call. If it is a thumb target, we |
| 2089 | insert glue. */ |
| 2090 | |
| 2091 | if (h->class == C_THUMBEXTFUNC) |
| 2092 | record_arm_to_thumb_glue (info, h); |
| 2093 | break; |
| 2094 | |
| 2095 | #ifndef ARM_WINCE |
| 2096 | case ARM_THUMB23: |
| 2097 | /* This one is a call from thumb code. We used to look |
| 2098 | for ARM_THUMB9 and ARM_THUMB12 as well. We need to look |
| 2099 | up the target of the call. If it is an arm target, we |
| 2100 | insert glue. If the symbol does not exist it will be |
| 2101 | given a class of C_EXT and so we will generate a stub |
| 2102 | for it. This is not really a problem, since the link |
| 2103 | is doomed anyway. */ |
| 2104 | |
| 2105 | switch (h->class) |
| 2106 | { |
| 2107 | case C_EXT: |
| 2108 | case C_STAT: |
| 2109 | case C_LABEL: |
| 2110 | record_thumb_to_arm_glue (info, h); |
| 2111 | break; |
| 2112 | default: |
| 2113 | ; |
| 2114 | } |
| 2115 | break; |
| 2116 | #endif |
| 2117 | |
| 2118 | default: |
| 2119 | break; |
| 2120 | } |
| 2121 | } |
| 2122 | } |
| 2123 | |
| 2124 | return true; |
| 2125 | } |
| 2126 | |
| 2127 | #endif /* ! defined (COFF_IMAGE_WITH_PE) */ |
| 2128 | |
| 2129 | #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_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 relocateable link, we want to convert ARM26 relocs |
| 2142 | into ARM26D relocs. */ |
| 2143 | |
| 2144 | static boolean |
| 2145 | coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp) |
| 2146 | bfd *obfd ATTRIBUTE_UNUSED; |
| 2147 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 2148 | bfd *ibfd; |
| 2149 | asection *sec; |
| 2150 | struct internal_reloc *irel; |
| 2151 | boolean *adjustedp; |
| 2152 | { |
| 2153 | if (irel->r_type == 3) |
| 2154 | { |
| 2155 | struct coff_link_hash_entry *h; |
| 2156 | |
| 2157 | h = obj_coff_sym_hashes (ibfd)[irel->r_symndx]; |
| 2158 | if (h != NULL |
| 2159 | && (h->root.type == bfd_link_hash_defined |
| 2160 | || h->root.type == bfd_link_hash_defweak) |
| 2161 | && h->root.u.def.section->output_section == sec->output_section) |
| 2162 | irel->r_type = 7; |
| 2163 | } |
| 2164 | *adjustedp = false; |
| 2165 | return true; |
| 2166 | } |
| 2167 | |
| 2168 | /* Called when merging the private data areas of two BFDs. |
| 2169 | This is important as it allows us to detect if we are |
| 2170 | attempting to merge binaries compiled for different ARM |
| 2171 | targets, eg different CPUs or differents APCS's. */ |
| 2172 | |
| 2173 | static boolean |
| 2174 | coff_arm_merge_private_bfd_data (ibfd, obfd) |
| 2175 | bfd * ibfd; |
| 2176 | bfd * obfd; |
| 2177 | { |
| 2178 | BFD_ASSERT (ibfd != NULL && obfd != NULL); |
| 2179 | |
| 2180 | if (ibfd == obfd) |
| 2181 | return true; |
| 2182 | |
| 2183 | /* If the two formats are different we cannot merge anything. |
| 2184 | This is not an error, since it is permissable to change the |
| 2185 | input and output formats. */ |
| 2186 | if ( ibfd->xvec->flavour != bfd_target_coff_flavour |
| 2187 | || obfd->xvec->flavour != bfd_target_coff_flavour) |
| 2188 | return true; |
| 2189 | |
| 2190 | /* Verify that the APCS is the same for the two BFDs */ |
| 2191 | if (APCS_SET (ibfd)) |
| 2192 | { |
| 2193 | if (APCS_SET (obfd)) |
| 2194 | { |
| 2195 | /* If the src and dest have different APCS flag bits set, fail. */ |
| 2196 | if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd)) |
| 2197 | { |
| 2198 | _bfd_error_handler |
| 2199 | /* xgettext: c-format */ |
| 2200 | (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"), |
| 2201 | bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32, |
| 2202 | bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32 |
| 2203 | ); |
| 2204 | |
| 2205 | bfd_set_error (bfd_error_wrong_format); |
| 2206 | return false; |
| 2207 | } |
| 2208 | |
| 2209 | if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd)) |
| 2210 | { |
| 2211 | const char *msg; |
| 2212 | |
| 2213 | if (APCS_FLOAT_FLAG (ibfd)) |
| 2214 | /* xgettext: c-format */ |
| 2215 | msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers"); |
| 2216 | else |
| 2217 | /* xgettext: c-format */ |
| 2218 | msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers"); |
| 2219 | |
| 2220 | _bfd_error_handler (msg, bfd_get_filename (ibfd), |
| 2221 | bfd_get_filename (obfd)); |
| 2222 | |
| 2223 | bfd_set_error (bfd_error_wrong_format); |
| 2224 | return false; |
| 2225 | } |
| 2226 | |
| 2227 | if (PIC_FLAG (obfd) != PIC_FLAG (ibfd)) |
| 2228 | { |
| 2229 | const char * msg; |
| 2230 | |
| 2231 | if (PIC_FLAG (ibfd)) |
| 2232 | /* xgettext: c-format */ |
| 2233 | msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position"); |
| 2234 | else |
| 2235 | /* xgettext: c-format */ |
| 2236 | msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent"); |
| 2237 | _bfd_error_handler (msg, bfd_get_filename (ibfd), |
| 2238 | bfd_get_filename (obfd)); |
| 2239 | |
| 2240 | bfd_set_error (bfd_error_wrong_format); |
| 2241 | return false; |
| 2242 | } |
| 2243 | } |
| 2244 | else |
| 2245 | { |
| 2246 | SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd)); |
| 2247 | |
| 2248 | /* Set up the arch and fields as well as these are probably wrong. */ |
| 2249 | bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); |
| 2250 | } |
| 2251 | } |
| 2252 | |
| 2253 | /* Check the interworking support. */ |
| 2254 | if (INTERWORK_SET (ibfd)) |
| 2255 | { |
| 2256 | if (INTERWORK_SET (obfd)) |
| 2257 | { |
| 2258 | /* If the src and dest differ in their interworking issue a warning. */ |
| 2259 | if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd)) |
| 2260 | { |
| 2261 | const char * msg; |
| 2262 | |
| 2263 | if (INTERWORK_FLAG (ibfd)) |
| 2264 | /* xgettext: c-format */ |
| 2265 | msg = _("Warning: input file %s supports interworking, whereas %s does not."); |
| 2266 | else |
| 2267 | /* xgettext: c-format */ |
| 2268 | msg = _("Warning: input file %s does not support interworking, whereas %s does."); |
| 2269 | |
| 2270 | _bfd_error_handler (msg, bfd_get_filename (ibfd), |
| 2271 | bfd_get_filename (obfd)); |
| 2272 | } |
| 2273 | } |
| 2274 | else |
| 2275 | { |
| 2276 | SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd)); |
| 2277 | } |
| 2278 | } |
| 2279 | |
| 2280 | return true; |
| 2281 | } |
| 2282 | |
| 2283 | /* Display the flags field. */ |
| 2284 | |
| 2285 | static boolean |
| 2286 | coff_arm_print_private_bfd_data (abfd, ptr) |
| 2287 | bfd * abfd; |
| 2288 | PTR ptr; |
| 2289 | { |
| 2290 | FILE * file = (FILE *) ptr; |
| 2291 | |
| 2292 | BFD_ASSERT (abfd != NULL && ptr != NULL); |
| 2293 | |
| 2294 | /* xgettext:c-format */ |
| 2295 | fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags); |
| 2296 | |
| 2297 | if (APCS_SET (abfd)) |
| 2298 | { |
| 2299 | /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */ |
| 2300 | fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32); |
| 2301 | |
| 2302 | if (APCS_FLOAT_FLAG (abfd)) |
| 2303 | fprintf (file, _(" [floats passed in float registers]")); |
| 2304 | else |
| 2305 | fprintf (file, _(" [floats passed in integer registers]")); |
| 2306 | |
| 2307 | if (PIC_FLAG (abfd)) |
| 2308 | fprintf (file, _(" [position independent]")); |
| 2309 | else |
| 2310 | fprintf (file, _(" [absolute position]")); |
| 2311 | } |
| 2312 | |
| 2313 | if (! INTERWORK_SET (abfd)) |
| 2314 | fprintf (file, _(" [interworking flag not initialised]")); |
| 2315 | else if (INTERWORK_FLAG (abfd)) |
| 2316 | fprintf (file, _(" [interworking supported]")); |
| 2317 | else |
| 2318 | fprintf (file, _(" [interworking not supported]")); |
| 2319 | |
| 2320 | fputc ('\n', file); |
| 2321 | |
| 2322 | return true; |
| 2323 | } |
| 2324 | |
| 2325 | /* Copies the given flags into the coff_tdata.flags field. |
| 2326 | Typically these flags come from the f_flags[] field of |
| 2327 | the COFF filehdr structure, which contains important, |
| 2328 | target specific information. |
| 2329 | Note: Although this function is static, it is explicitly |
| 2330 | called from both coffcode.h and peicode.h. */ |
| 2331 | |
| 2332 | static boolean |
| 2333 | _bfd_coff_arm_set_private_flags (abfd, flags) |
| 2334 | bfd * abfd; |
| 2335 | flagword flags; |
| 2336 | { |
| 2337 | flagword flag; |
| 2338 | |
| 2339 | BFD_ASSERT (abfd != NULL); |
| 2340 | |
| 2341 | flag = (flags & F_APCS26) ? F_APCS_26 : 0; |
| 2342 | |
| 2343 | /* Make sure that the APCS field has not been initialised to the opposite |
| 2344 | value. */ |
| 2345 | if (APCS_SET (abfd) |
| 2346 | && ( (APCS_26_FLAG (abfd) != flag) |
| 2347 | || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT)) |
| 2348 | || (PIC_FLAG (abfd) != (flags & F_PIC)) |
| 2349 | )) |
| 2350 | return false; |
| 2351 | |
| 2352 | flag |= (flags & (F_APCS_FLOAT | F_PIC)); |
| 2353 | |
| 2354 | SET_APCS_FLAGS (abfd, flag); |
| 2355 | |
| 2356 | flag = (flags & F_INTERWORK); |
| 2357 | |
| 2358 | /* If the BFD has already had its interworking flag set, but it |
| 2359 | is different from the value that we have been asked to set, |
| 2360 | then assume that that merged code will not support interworking |
| 2361 | and set the flag accordingly. */ |
| 2362 | if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag)) |
| 2363 | { |
| 2364 | if (flag) |
| 2365 | /* xgettext: c-format */ |
| 2366 | _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"), |
| 2367 | bfd_get_filename (abfd)); |
| 2368 | else |
| 2369 | /* xgettext: c-format */ |
| 2370 | _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"), |
| 2371 | bfd_get_filename (abfd)); |
| 2372 | flag = 0; |
| 2373 | } |
| 2374 | |
| 2375 | SET_INTERWORK_FLAG (abfd, flag); |
| 2376 | |
| 2377 | return true; |
| 2378 | } |
| 2379 | |
| 2380 | /* Copy the important parts of the target specific data |
| 2381 | from one instance of a BFD to another. */ |
| 2382 | |
| 2383 | static boolean |
| 2384 | coff_arm_copy_private_bfd_data (src, dest) |
| 2385 | bfd * src; |
| 2386 | bfd * dest; |
| 2387 | { |
| 2388 | BFD_ASSERT (src != NULL && dest != NULL); |
| 2389 | |
| 2390 | if (src == dest) |
| 2391 | return true; |
| 2392 | |
| 2393 | /* If the destination is not in the same format as the source, do not do |
| 2394 | the copy. */ |
| 2395 | if (src->xvec != dest->xvec) |
| 2396 | return true; |
| 2397 | |
| 2398 | /* copy the flags field */ |
| 2399 | if (APCS_SET (src)) |
| 2400 | { |
| 2401 | if (APCS_SET (dest)) |
| 2402 | { |
| 2403 | /* If the src and dest have different APCS flag bits set, fail. */ |
| 2404 | if (APCS_26_FLAG (dest) != APCS_26_FLAG (src)) |
| 2405 | return false; |
| 2406 | |
| 2407 | if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src)) |
| 2408 | return false; |
| 2409 | |
| 2410 | if (PIC_FLAG (dest) != PIC_FLAG (src)) |
| 2411 | return false; |
| 2412 | } |
| 2413 | else |
| 2414 | SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src) |
| 2415 | | PIC_FLAG (src)); |
| 2416 | } |
| 2417 | |
| 2418 | if (INTERWORK_SET (src)) |
| 2419 | { |
| 2420 | if (INTERWORK_SET (dest)) |
| 2421 | { |
| 2422 | /* If the src and dest have different interworking flags then turn |
| 2423 | off the interworking bit. */ |
| 2424 | if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src)) |
| 2425 | { |
| 2426 | if (INTERWORK_FLAG (dest)) |
| 2427 | { |
| 2428 | /* xgettext:c-format */ |
| 2429 | _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"), |
| 2430 | bfd_get_filename (dest), |
| 2431 | bfd_get_filename (src)); |
| 2432 | } |
| 2433 | |
| 2434 | SET_INTERWORK_FLAG (dest, 0); |
| 2435 | } |
| 2436 | } |
| 2437 | else |
| 2438 | { |
| 2439 | SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src)); |
| 2440 | } |
| 2441 | } |
| 2442 | |
| 2443 | return true; |
| 2444 | } |
| 2445 | |
| 2446 | /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX |
| 2447 | *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */ |
| 2448 | #define LOCAL_LABEL_PREFIX "" |
| 2449 | #ifndef USER_LABEL_PREFIX |
| 2450 | #define USER_LABEL_PREFIX "_" |
| 2451 | #endif |
| 2452 | |
| 2453 | /* Like _bfd_coff_is_local_label_name, but |
| 2454 | a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be |
| 2455 | non-local. |
| 2456 | b) Allow other prefixes than ".", e.g. an empty prefix would cause all |
| 2457 | labels of the form Lxxx to be stripped. */ |
| 2458 | static boolean |
| 2459 | coff_arm_is_local_label_name (abfd, name) |
| 2460 | bfd * abfd ATTRIBUTE_UNUSED; |
| 2461 | const char * name; |
| 2462 | { |
| 2463 | #ifdef USER_LABEL_PREFIX |
| 2464 | if (USER_LABEL_PREFIX[0] != 0) |
| 2465 | { |
| 2466 | if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0) |
| 2467 | return false; |
| 2468 | } |
| 2469 | #endif |
| 2470 | |
| 2471 | #ifdef LOCAL_LABEL_PREFIX |
| 2472 | /* If there is a prefix for local labels then look for this. |
| 2473 | If the prefix exists, but it is empty, then ignore the test. */ |
| 2474 | |
| 2475 | if (LOCAL_LABEL_PREFIX[0] != 0) |
| 2476 | { |
| 2477 | int len = strlen (LOCAL_LABEL_PREFIX); |
| 2478 | |
| 2479 | if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0) |
| 2480 | return false; |
| 2481 | |
| 2482 | /* Perform the checks below for the rest of the name. */ |
| 2483 | name += len; |
| 2484 | } |
| 2485 | #endif |
| 2486 | |
| 2487 | return name[0] == 'L'; |
| 2488 | } |
| 2489 | |
| 2490 | /* This piece of machinery exists only to guarantee that the bfd that holds |
| 2491 | the glue section is written last. |
| 2492 | |
| 2493 | This does depend on bfd_make_section attaching a new section to the |
| 2494 | end of the section list for the bfd. |
| 2495 | |
| 2496 | krk@cygnus.com */ |
| 2497 | |
| 2498 | static boolean |
| 2499 | coff_arm_link_output_has_begun (sub, info) |
| 2500 | bfd * sub; |
| 2501 | struct coff_final_link_info * info; |
| 2502 | { |
| 2503 | return (sub->output_has_begun |
| 2504 | || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner); |
| 2505 | } |
| 2506 | |
| 2507 | static boolean |
| 2508 | coff_arm_final_link_postscript (abfd, pfinfo) |
| 2509 | bfd * abfd ATTRIBUTE_UNUSED; |
| 2510 | struct coff_final_link_info * pfinfo; |
| 2511 | { |
| 2512 | struct coff_arm_link_hash_table * globals; |
| 2513 | |
| 2514 | globals = coff_arm_hash_table (pfinfo->info); |
| 2515 | |
| 2516 | BFD_ASSERT (globals != NULL); |
| 2517 | |
| 2518 | if (globals->bfd_of_glue_owner != NULL) |
| 2519 | { |
| 2520 | if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner)) |
| 2521 | return false; |
| 2522 | |
| 2523 | globals->bfd_of_glue_owner->output_has_begun = true; |
| 2524 | } |
| 2525 | |
| 2526 | return true; |
| 2527 | } |
| 2528 | |
| 2529 | #include "coffcode.h" |
| 2530 | |
| 2531 | #ifndef TARGET_LITTLE_SYM |
| 2532 | #define TARGET_LITTLE_SYM armcoff_little_vec |
| 2533 | #endif |
| 2534 | #ifndef TARGET_LITTLE_NAME |
| 2535 | #define TARGET_LITTLE_NAME "coff-arm-little" |
| 2536 | #endif |
| 2537 | #ifndef TARGET_BIG_SYM |
| 2538 | #define TARGET_BIG_SYM armcoff_big_vec |
| 2539 | #endif |
| 2540 | #ifndef TARGET_BIG_NAME |
| 2541 | #define TARGET_BIG_NAME "coff-arm-big" |
| 2542 | #endif |
| 2543 | |
| 2544 | #ifndef TARGET_UNDERSCORE |
| 2545 | #define TARGET_UNDERSCORE 0 |
| 2546 | #endif |
| 2547 | |
| 2548 | #ifndef EXTRA_S_FLAGS |
| 2549 | #ifdef COFF_WITH_PE |
| 2550 | #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES) |
| 2551 | #else |
| 2552 | #define EXTRA_S_FLAGS 0 |
| 2553 | #endif |
| 2554 | #endif |
| 2555 | |
| 2556 | /* Forward declaration for use initialising alternative_target field. */ |
| 2557 | extern const bfd_target TARGET_BIG_SYM ; |
| 2558 | |
| 2559 | /* Target vectors. */ |
| 2560 | CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM) |
| 2561 | CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM) |