1 /* Motorola MCore specific support for 32-bit ELF 2 Copyright 1994, 1995, 1999, 2000, 2001, 2002, 2003, 2004 3 Free Software Foundation, Inc. 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 20 21 /* This file is based on a preliminary RCE ELF ABI. The 22 information may not match the final RCE ELF ABI. */ 23 24 #include "bfd.h" 25 #include "sysdep.h" 26 #include "bfdlink.h" 27 #include "libbfd.h" 28 #include "elf-bfd.h" 29 #include "elf/mcore.h" 30 #include <assert.h> 31 32 /* RELA relocs are used here... */ 33 34 static void mcore_elf_howto_init 35 PARAMS ((void)); 36 static reloc_howto_type * mcore_elf_reloc_type_lookup 37 PARAMS ((bfd *, bfd_reloc_code_real_type)); 38 static void mcore_elf_info_to_howto 39 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 40 static bfd_boolean mcore_elf_set_private_flags 41 PARAMS ((bfd *, flagword)); 42 static bfd_boolean mcore_elf_merge_private_bfd_data 43 PARAMS ((bfd *, bfd *)); 44 static bfd_reloc_status_type mcore_elf_unsupported_reloc 45 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 46 static bfd_boolean mcore_elf_relocate_section 47 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 48 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 49 static asection * mcore_elf_gc_mark_hook 50 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, 51 struct elf_link_hash_entry *, Elf_Internal_Sym *)); 52 static bfd_boolean mcore_elf_gc_sweep_hook 53 PARAMS ((bfd *, struct bfd_link_info *, asection *, 54 const Elf_Internal_Rela *)); 55 static bfd_boolean mcore_elf_check_relocs 56 PARAMS ((bfd *, struct bfd_link_info *, asection *, 57 const Elf_Internal_Rela *)); 58 59 static reloc_howto_type * mcore_elf_howto_table [(int) R_MCORE_max]; 60 61 static reloc_howto_type mcore_elf_howto_raw[] = 62 { 63 /* This reloc does nothing. */ 64 HOWTO (R_MCORE_NONE, /* type */ 65 0, /* rightshift */ 66 2, /* size (0 = byte, 1 = short, 2 = long) */ 67 32, /* bitsize */ 68 FALSE, /* pc_relative */ 69 0, /* bitpos */ 70 complain_overflow_bitfield, /* complain_on_overflow */ 71 NULL, /* special_function */ 72 "R_MCORE_NONE", /* name */ 73 FALSE, /* partial_inplace */ 74 0, /* src_mask */ 75 0, /* dst_mask */ 76 FALSE), /* pcrel_offset */ 77 78 /* A standard 32 bit relocation. */ 79 HOWTO (R_MCORE_ADDR32, /* type */ 80 0, /* rightshift */ 81 2, /* size (0 = byte, 1 = short, 2 = long) */ 82 32, /* bitsize */ 83 FALSE, /* pc_relative */ 84 0, /* bitpos */ 85 complain_overflow_bitfield, /* complain_on_overflow */ 86 bfd_elf_generic_reloc, /* special_function */ 87 "ADDR32", /* name *//* For compatibility with coff/pe port. */ 88 FALSE, /* partial_inplace */ 89 0x0, /* src_mask */ 90 0xffffffff, /* dst_mask */ 91 FALSE), /* pcrel_offset */ 92 93 /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions. 94 Should not appear in object files. */ 95 HOWTO (R_MCORE_PCRELIMM8BY4, /* type */ 96 2, /* rightshift */ 97 1, /* size (0 = byte, 1 = short, 2 = long) */ 98 8, /* bitsize */ 99 TRUE, /* pc_relative */ 100 0, /* bitpos */ 101 complain_overflow_bitfield, /* complain_on_overflow */ 102 mcore_elf_unsupported_reloc, /* special_function */ 103 "R_MCORE_PCRELIMM8BY4",/* name */ 104 FALSE, /* partial_inplace */ 105 0, /* src_mask */ 106 0, /* dst_mask */ 107 TRUE), /* pcrel_offset */ 108 109 /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit 110 Span 2k instructions == 4k bytes. 111 Only useful pieces at the relocated address are the opcode (5 bits) */ 112 HOWTO (R_MCORE_PCRELIMM11BY2,/* type */ 113 1, /* rightshift */ 114 1, /* size (0 = byte, 1 = short, 2 = long) */ 115 11, /* bitsize */ 116 TRUE, /* pc_relative */ 117 0, /* bitpos */ 118 complain_overflow_signed, /* complain_on_overflow */ 119 bfd_elf_generic_reloc, /* special_function */ 120 "R_MCORE_PCRELIMM11BY2",/* name */ 121 FALSE, /* partial_inplace */ 122 0x0, /* src_mask */ 123 0x7ff, /* dst_mask */ 124 TRUE), /* pcrel_offset */ 125 126 /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */ 127 HOWTO (R_MCORE_PCRELIMM4BY2, /* type */ 128 1, /* rightshift */ 129 1, /* size (0 = byte, 1 = short, 2 = long) */ 130 4, /* bitsize */ 131 TRUE, /* pc_relative */ 132 0, /* bitpos */ 133 complain_overflow_bitfield, /* complain_on_overflow */ 134 mcore_elf_unsupported_reloc,/* special_function */ 135 "R_MCORE_PCRELIMM4BY2",/* name */ 136 FALSE, /* partial_inplace */ 137 0, /* src_mask */ 138 0, /* dst_mask */ 139 TRUE), /* pcrel_offset */ 140 141 /* 32-bit pc-relative. Eventually this will help support PIC code. */ 142 HOWTO (R_MCORE_PCREL32, /* type */ 143 0, /* rightshift */ 144 2, /* size (0 = byte, 1 = short, 2 = long) */ 145 32, /* bitsize */ 146 TRUE, /* pc_relative */ 147 0, /* bitpos */ 148 complain_overflow_bitfield, /* complain_on_overflow */ 149 bfd_elf_generic_reloc, /* special_function */ 150 "R_MCORE_PCREL32", /* name */ 151 FALSE, /* partial_inplace */ 152 0x0, /* src_mask */ 153 0xffffffff, /* dst_mask */ 154 TRUE), /* pcrel_offset */ 155 156 /* Like PCRELIMM11BY2, this relocation indicates that there is a 157 'jsri' at the specified address. There is a separate relocation 158 entry for the literal pool entry that it references, but we 159 might be able to change the jsri to a bsr if the target turns out 160 to be close enough [even though we won't reclaim the literal pool 161 entry, we'll get some runtime efficiency back]. Note that this 162 is a relocation that we are allowed to safely ignore. */ 163 HOWTO (R_MCORE_PCRELJSR_IMM11BY2,/* type */ 164 1, /* rightshift */ 165 1, /* size (0 = byte, 1 = short, 2 = long) */ 166 11, /* bitsize */ 167 TRUE, /* pc_relative */ 168 0, /* bitpos */ 169 complain_overflow_signed, /* complain_on_overflow */ 170 bfd_elf_generic_reloc, /* special_function */ 171 "R_MCORE_PCRELJSR_IMM11BY2", /* name */ 172 FALSE, /* partial_inplace */ 173 0x0, /* src_mask */ 174 0x7ff, /* dst_mask */ 175 TRUE), /* pcrel_offset */ 176 177 /* GNU extension to record C++ vtable hierarchy */ 178 HOWTO (R_MCORE_GNU_VTINHERIT, /* type */ 179 0, /* rightshift */ 180 2, /* size (0 = byte, 1 = short, 2 = long) */ 181 0, /* bitsize */ 182 FALSE, /* pc_relative */ 183 0, /* bitpos */ 184 complain_overflow_dont, /* complain_on_overflow */ 185 NULL, /* special_function */ 186 "R_MCORE_GNU_VTINHERIT", /* name */ 187 FALSE, /* partial_inplace */ 188 0, /* src_mask */ 189 0, /* dst_mask */ 190 FALSE), /* pcrel_offset */ 191 192 /* GNU extension to record C++ vtable member usage */ 193 HOWTO (R_MCORE_GNU_VTENTRY, /* type */ 194 0, /* rightshift */ 195 2, /* size (0 = byte, 1 = short, 2 = long) */ 196 0, /* bitsize */ 197 FALSE, /* pc_relative */ 198 0, /* bitpos */ 199 complain_overflow_dont,/* complain_on_overflow */ 200 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 201 "R_MCORE_GNU_VTENTRY", /* name */ 202 FALSE, /* partial_inplace */ 203 0, /* src_mask */ 204 0, /* dst_mask */ 205 FALSE), /* pcrel_offset */ 206 207 HOWTO (R_MCORE_RELATIVE, /* type */ 208 0, /* rightshift */ 209 2, /* size (0 = byte, 1 = short, 2 = long) */ 210 32, /* bitsize */ 211 FALSE, /* pc_relative */ 212 0, /* bitpos */ 213 complain_overflow_signed, /* complain_on_overflow */ 214 NULL, /* special_function */ 215 "R_MCORE_RELATIVE", /* name */ 216 TRUE, /* partial_inplace */ 217 0xffffffff, /* src_mask */ 218 0xffffffff, /* dst_mask */ 219 FALSE) /* pcrel_offset */ 220 }; 221 222 #ifndef NUM_ELEM 223 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0]) 224 #endif 225 226 /* Initialize the mcore_elf_howto_table, so that linear accesses can be done. */ 227 static void 228 mcore_elf_howto_init () 229 { 230 unsigned int i; 231 232 for (i = NUM_ELEM (mcore_elf_howto_raw); i--;) 233 { 234 unsigned int type; 235 236 type = mcore_elf_howto_raw[i].type; 237 238 BFD_ASSERT (type < NUM_ELEM (mcore_elf_howto_table)); 239 240 mcore_elf_howto_table [type] = & mcore_elf_howto_raw [i]; 241 } 242 } 243 244 static reloc_howto_type * 245 mcore_elf_reloc_type_lookup (abfd, code) 246 bfd * abfd ATTRIBUTE_UNUSED; 247 bfd_reloc_code_real_type code; 248 { 249 enum elf_mcore_reloc_type mcore_reloc = R_MCORE_NONE; 250 251 switch (code) 252 { 253 case BFD_RELOC_NONE: mcore_reloc = R_MCORE_NONE; break; 254 case BFD_RELOC_32: mcore_reloc = R_MCORE_ADDR32; break; 255 case BFD_RELOC_MCORE_PCREL_IMM8BY4: mcore_reloc = R_MCORE_PCRELIMM8BY4; break; 256 case BFD_RELOC_MCORE_PCREL_IMM11BY2: mcore_reloc = R_MCORE_PCRELIMM11BY2; break; 257 case BFD_RELOC_MCORE_PCREL_IMM4BY2: mcore_reloc = R_MCORE_PCRELIMM4BY2; break; 258 case BFD_RELOC_32_PCREL: mcore_reloc = R_MCORE_PCREL32; break; 259 case BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2: mcore_reloc = R_MCORE_PCRELJSR_IMM11BY2; break; 260 case BFD_RELOC_VTABLE_INHERIT: mcore_reloc = R_MCORE_GNU_VTINHERIT; break; 261 case BFD_RELOC_VTABLE_ENTRY: mcore_reloc = R_MCORE_GNU_VTENTRY; break; 262 case BFD_RELOC_RVA: mcore_reloc = R_MCORE_RELATIVE; break; 263 default: 264 return (reloc_howto_type *)NULL; 265 } 266 267 if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */ 268 mcore_elf_howto_init (); 269 270 return mcore_elf_howto_table [(int) mcore_reloc]; 271 }; 272 273 /* Set the howto pointer for a RCE ELF reloc. */ 274 static void 275 mcore_elf_info_to_howto (abfd, cache_ptr, dst) 276 bfd * abfd ATTRIBUTE_UNUSED; 277 arelent * cache_ptr; 278 Elf_Internal_Rela * dst; 279 { 280 if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */ 281 mcore_elf_howto_init (); 282 283 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_MCORE_max); 284 285 cache_ptr->howto = mcore_elf_howto_table [ELF32_R_TYPE (dst->r_info)]; 286 } 287 288 /* Function to set whether a module needs the -mrelocatable bit set. */ 289 static bfd_boolean 290 mcore_elf_set_private_flags (abfd, flags) 291 bfd * abfd; 292 flagword flags; 293 { 294 BFD_ASSERT (! elf_flags_init (abfd) 295 || elf_elfheader (abfd)->e_flags == flags); 296 297 elf_elfheader (abfd)->e_flags = flags; 298 elf_flags_init (abfd) = TRUE; 299 return TRUE; 300 } 301 302 /* Merge backend specific data from an object file to the output 303 object file when linking. */ 304 static bfd_boolean 305 mcore_elf_merge_private_bfd_data (ibfd, obfd) 306 bfd * ibfd; 307 bfd * obfd; 308 { 309 flagword old_flags; 310 flagword new_flags; 311 312 /* Check if we have the same endianess */ 313 if (! _bfd_generic_verify_endian_match (ibfd, obfd)) 314 return FALSE; 315 316 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 317 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 318 return TRUE; 319 320 new_flags = elf_elfheader (ibfd)->e_flags; 321 old_flags = elf_elfheader (obfd)->e_flags; 322 323 if (! elf_flags_init (obfd)) /* First call, no flags set */ 324 { 325 elf_flags_init (obfd) = TRUE; 326 elf_elfheader (obfd)->e_flags = new_flags; 327 } 328 else if (new_flags == old_flags) /* Compatible flags are ok */ 329 ; 330 else 331 { 332 /* FIXME */ 333 } 334 335 return TRUE; 336 } 337 338 /* Don't pretend we can deal with unsupported relocs. */ 339 340 static bfd_reloc_status_type 341 mcore_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section, 342 output_bfd, error_message) 343 bfd * abfd; 344 arelent * reloc_entry; 345 asymbol * symbol ATTRIBUTE_UNUSED; 346 PTR data ATTRIBUTE_UNUSED; 347 asection * input_section ATTRIBUTE_UNUSED; 348 bfd * output_bfd ATTRIBUTE_UNUSED; 349 char ** error_message ATTRIBUTE_UNUSED; 350 { 351 BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0); 352 353 _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"), 354 bfd_archive_filename (abfd), 355 reloc_entry->howto->name, 356 reloc_entry->howto->type); 357 358 return bfd_reloc_notsupported; 359 } 360 361 /* The RELOCATE_SECTION function is called by the ELF backend linker 362 to handle the relocations for a section. 363 364 The relocs are always passed as Rela structures; if the section 365 actually uses Rel structures, the r_addend field will always be 366 zero. 367 368 This function is responsible for adjust the section contents as 369 necessary, and (if using Rela relocs and generating a 370 relocatable output file) adjusting the reloc addend as 371 necessary. 372 373 This function does not have to worry about setting the reloc 374 address or the reloc symbol index. 375 376 LOCAL_SYMS is a pointer to the swapped in local symbols. 377 378 LOCAL_SECTIONS is an array giving the section in the input file 379 corresponding to the st_shndx field of each local symbol. 380 381 The global hash table entry for the global symbols can be found 382 via elf_sym_hashes (input_bfd). 383 384 When generating relocatable output, this function must handle 385 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 386 going to be the section symbol corresponding to the output 387 section, which means that the addend must be adjusted 388 accordingly. */ 389 390 static bfd_boolean 391 mcore_elf_relocate_section (output_bfd, info, input_bfd, input_section, 392 contents, relocs, local_syms, local_sections) 393 bfd * output_bfd; 394 struct bfd_link_info * info; 395 bfd * input_bfd; 396 asection * input_section; 397 bfd_byte * contents; 398 Elf_Internal_Rela * relocs; 399 Elf_Internal_Sym * local_syms; 400 asection ** local_sections; 401 { 402 Elf_Internal_Shdr * symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 403 struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd); 404 Elf_Internal_Rela * rel = relocs; 405 Elf_Internal_Rela * relend = relocs + input_section->reloc_count; 406 bfd_boolean ret = TRUE; 407 408 #ifdef DEBUG 409 fprintf (stderr, 410 "mcore_elf_relocate_section called for %s section %s, %ld relocations%s\n", 411 bfd_archive_filename (input_bfd), 412 bfd_section_name(input_bfd, input_section), 413 (long) input_section->reloc_count, 414 (info->relocatable) ? " (relocatable)" : ""); 415 #endif 416 417 if (info->relocatable) 418 return TRUE; 419 420 if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */ 421 mcore_elf_howto_init (); 422 423 for (; rel < relend; rel++) 424 { 425 enum elf_mcore_reloc_type r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info); 426 bfd_vma offset = rel->r_offset; 427 bfd_vma addend = rel->r_addend; 428 bfd_reloc_status_type r = bfd_reloc_other; 429 asection * sec = (asection *) 0; 430 reloc_howto_type * howto; 431 bfd_vma relocation; 432 Elf_Internal_Sym * sym = (Elf_Internal_Sym *) 0; 433 unsigned long r_symndx; 434 struct elf_link_hash_entry * h = (struct elf_link_hash_entry *) 0; 435 unsigned short oldinst = 0; 436 437 /* Unknown relocation handling */ 438 if ((unsigned) r_type >= (unsigned) R_MCORE_max 439 || ! mcore_elf_howto_table [(int)r_type]) 440 { 441 _bfd_error_handler (_("%s: Unknown relocation type %d\n"), 442 bfd_archive_filename (input_bfd), 443 (int) r_type); 444 445 bfd_set_error (bfd_error_bad_value); 446 ret = FALSE; 447 continue; 448 } 449 450 howto = mcore_elf_howto_table [(int) r_type]; 451 r_symndx = ELF32_R_SYM (rel->r_info); 452 453 /* Complain about known relocation that are not yet supported. */ 454 if (howto->special_function == mcore_elf_unsupported_reloc) 455 { 456 _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"), 457 bfd_archive_filename (input_bfd), 458 howto->name, 459 (int)r_type); 460 461 bfd_set_error (bfd_error_bad_value); 462 ret = FALSE; 463 continue; 464 } 465 466 if (r_symndx < symtab_hdr->sh_info) 467 { 468 sym = local_syms + r_symndx; 469 sec = local_sections [r_symndx]; 470 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 471 addend = rel->r_addend; 472 } 473 else 474 { 475 bfd_boolean unresolved_reloc, warned; 476 477 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 478 r_symndx, symtab_hdr, sym_hashes, 479 h, sec, relocation, 480 unresolved_reloc, warned); 481 } 482 483 switch (r_type) 484 { 485 default: 486 break; 487 488 case R_MCORE_PCRELJSR_IMM11BY2: 489 oldinst = bfd_get_16 (input_bfd, contents + offset); 490 #define MCORE_INST_BSR 0xF800 491 bfd_put_16 (input_bfd, (bfd_vma) MCORE_INST_BSR, contents + offset); 492 break; 493 } 494 495 #ifdef DEBUG 496 fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n", 497 howto->name, r_type, r_symndx, (long) offset, (long) addend); 498 #endif 499 500 r = _bfd_final_link_relocate 501 (howto, input_bfd, input_section, contents, offset, relocation, addend); 502 503 if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2) 504 { 505 /* Wasn't ok, back it out and give up. */ 506 bfd_put_16 (input_bfd, (bfd_vma) oldinst, contents + offset); 507 r = bfd_reloc_ok; 508 } 509 510 if (r != bfd_reloc_ok) 511 { 512 ret = FALSE; 513 514 switch (r) 515 { 516 default: 517 break; 518 519 case bfd_reloc_overflow: 520 { 521 const char * name; 522 523 if (h != NULL) 524 name = h->root.root.string; 525 else 526 { 527 name = bfd_elf_string_from_elf_section 528 (input_bfd, symtab_hdr->sh_link, sym->st_name); 529 530 if (name == NULL) 531 break; 532 533 if (* name == '\0') 534 name = bfd_section_name (input_bfd, sec); 535 } 536 537 (*info->callbacks->reloc_overflow) 538 (info, name, howto->name, (bfd_vma) 0, input_bfd, input_section, 539 offset); 540 } 541 break; 542 } 543 } 544 } 545 546 #ifdef DEBUG 547 fprintf (stderr, "\n"); 548 #endif 549 550 return ret; 551 } 552 553 /* Return the section that should be marked against GC for a given 554 relocation. */ 555 556 static asection * 557 mcore_elf_gc_mark_hook (sec, info, rel, h, sym) 558 asection * sec; 559 struct bfd_link_info * info ATTRIBUTE_UNUSED; 560 Elf_Internal_Rela * rel; 561 struct elf_link_hash_entry * h; 562 Elf_Internal_Sym * sym; 563 { 564 if (h != NULL) 565 { 566 switch (ELF32_R_TYPE (rel->r_info)) 567 { 568 case R_MCORE_GNU_VTINHERIT: 569 case R_MCORE_GNU_VTENTRY: 570 break; 571 572 default: 573 switch (h->root.type) 574 { 575 case bfd_link_hash_defined: 576 case bfd_link_hash_defweak: 577 return h->root.u.def.section; 578 579 case bfd_link_hash_common: 580 return h->root.u.c.p->section; 581 582 default: 583 break; 584 } 585 } 586 } 587 else 588 return bfd_section_from_elf_index (sec->owner, sym->st_shndx); 589 590 return NULL; 591 } 592 593 /* Update the got entry reference counts for the section being removed. */ 594 595 static bfd_boolean 596 mcore_elf_gc_sweep_hook (abfd, info, sec, relocs) 597 bfd * abfd ATTRIBUTE_UNUSED; 598 struct bfd_link_info * info ATTRIBUTE_UNUSED; 599 asection * sec ATTRIBUTE_UNUSED; 600 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED; 601 { 602 return TRUE; 603 } 604 605 /* Look through the relocs for a section during the first phase. 606 Since we don't do .gots or .plts, we just need to consider the 607 virtual table relocs for gc. */ 608 609 static bfd_boolean 610 mcore_elf_check_relocs (abfd, info, sec, relocs) 611 bfd * abfd; 612 struct bfd_link_info * info; 613 asection * sec; 614 const Elf_Internal_Rela * relocs; 615 { 616 Elf_Internal_Shdr * symtab_hdr; 617 struct elf_link_hash_entry ** sym_hashes; 618 struct elf_link_hash_entry ** sym_hashes_end; 619 const Elf_Internal_Rela * rel; 620 const Elf_Internal_Rela * rel_end; 621 622 if (info->relocatable) 623 return TRUE; 624 625 symtab_hdr = & elf_tdata (abfd)->symtab_hdr; 626 sym_hashes = elf_sym_hashes (abfd); 627 sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); 628 if (!elf_bad_symtab (abfd)) 629 sym_hashes_end -= symtab_hdr->sh_info; 630 631 rel_end = relocs + sec->reloc_count; 632 633 for (rel = relocs; rel < rel_end; rel++) 634 { 635 struct elf_link_hash_entry * h; 636 unsigned long r_symndx; 637 638 r_symndx = ELF32_R_SYM (rel->r_info); 639 640 if (r_symndx < symtab_hdr->sh_info) 641 h = NULL; 642 else 643 h = sym_hashes [r_symndx - symtab_hdr->sh_info]; 644 645 switch (ELF32_R_TYPE (rel->r_info)) 646 { 647 /* This relocation describes the C++ object vtable hierarchy. 648 Reconstruct it for later use during GC. */ 649 case R_MCORE_GNU_VTINHERIT: 650 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 651 return FALSE; 652 break; 653 654 /* This relocation describes which C++ vtable entries are actually 655 used. Record for later use during GC. */ 656 case R_MCORE_GNU_VTENTRY: 657 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 658 return FALSE; 659 break; 660 } 661 } 662 663 return TRUE; 664 } 665 666 static struct bfd_elf_special_section const mcore_elf_special_sections[]= 667 { 668 { ".ctors", 6, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 669 { ".dtors", 6, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 670 { NULL, 0, 0, 0, 0 } 671 }; 672 673 #define TARGET_BIG_SYM bfd_elf32_mcore_big_vec 674 #define TARGET_BIG_NAME "elf32-mcore-big" 675 #define TARGET_LITTLE_SYM bfd_elf32_mcore_little_vec 676 #define TARGET_LITTLE_NAME "elf32-mcore-little" 677 678 #define ELF_ARCH bfd_arch_mcore 679 #define ELF_MACHINE_CODE EM_MCORE 680 #define ELF_MAXPAGESIZE 0x1000 /* 4k, if we ever have 'em */ 681 #define elf_info_to_howto mcore_elf_info_to_howto 682 #define elf_info_to_howto_rel NULL 683 684 #define bfd_elf32_bfd_merge_private_bfd_data mcore_elf_merge_private_bfd_data 685 #define bfd_elf32_bfd_set_private_flags mcore_elf_set_private_flags 686 #define bfd_elf32_bfd_reloc_type_lookup mcore_elf_reloc_type_lookup 687 #define elf_backend_relocate_section mcore_elf_relocate_section 688 #define elf_backend_gc_mark_hook mcore_elf_gc_mark_hook 689 #define elf_backend_gc_sweep_hook mcore_elf_gc_sweep_hook 690 #define elf_backend_check_relocs mcore_elf_check_relocs 691 #define elf_backend_special_sections mcore_elf_special_sections 692 693 #define elf_backend_can_gc_sections 1 694 #define elf_backend_rela_normal 1 695 696 #include "elf32-target.h" 697