1/* Motorola 68k series support for 32-bit ELF 2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 3 2004 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#include "bfd.h" 22#include "sysdep.h" 23#include "bfdlink.h" 24#include "libbfd.h" 25#include "elf-bfd.h" 26#include "elf/m68k.h" 27 28static reloc_howto_type *reloc_type_lookup 29 PARAMS ((bfd *, bfd_reloc_code_real_type)); 30static void rtype_to_howto 31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 32static struct bfd_hash_entry *elf_m68k_link_hash_newfunc 33 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); 34static struct bfd_link_hash_table *elf_m68k_link_hash_table_create 35 PARAMS ((bfd *)); 36static bfd_boolean elf_m68k_check_relocs 37 PARAMS ((bfd *, struct bfd_link_info *, asection *, 38 const Elf_Internal_Rela *)); 39static asection *elf_m68k_gc_mark_hook 40 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, 41 struct elf_link_hash_entry *, Elf_Internal_Sym *)); 42static bfd_boolean elf_m68k_gc_sweep_hook 43 PARAMS ((bfd *, struct bfd_link_info *, asection *, 44 const Elf_Internal_Rela *)); 45static bfd_boolean elf_m68k_adjust_dynamic_symbol 46 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); 47static bfd_boolean elf_m68k_size_dynamic_sections 48 PARAMS ((bfd *, struct bfd_link_info *)); 49static bfd_boolean elf_m68k_discard_copies 50 PARAMS ((struct elf_link_hash_entry *, PTR)); 51static bfd_boolean elf_m68k_relocate_section 52 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 53 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 54static bfd_boolean elf_m68k_finish_dynamic_symbol 55 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, 56 Elf_Internal_Sym *)); 57static bfd_boolean elf_m68k_finish_dynamic_sections 58 PARAMS ((bfd *, struct bfd_link_info *)); 59 60static bfd_boolean elf32_m68k_set_private_flags 61 PARAMS ((bfd *, flagword)); 62static bfd_boolean elf32_m68k_merge_private_bfd_data 63 PARAMS ((bfd *, bfd *)); 64static bfd_boolean elf32_m68k_print_private_bfd_data 65 PARAMS ((bfd *, PTR)); 66static enum elf_reloc_type_class elf32_m68k_reloc_type_class 67 PARAMS ((const Elf_Internal_Rela *)); 68 69static reloc_howto_type howto_table[] = { 70 HOWTO(R_68K_NONE, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", FALSE, 0, 0x00000000,FALSE), 71 HOWTO(R_68K_32, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", FALSE, 0, 0xffffffff,FALSE), 72 HOWTO(R_68K_16, 0, 1,16, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", FALSE, 0, 0x0000ffff,FALSE), 73 HOWTO(R_68K_8, 0, 0, 8, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", FALSE, 0, 0x000000ff,FALSE), 74 HOWTO(R_68K_PC32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", FALSE, 0, 0xffffffff,TRUE), 75 HOWTO(R_68K_PC16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", FALSE, 0, 0x0000ffff,TRUE), 76 HOWTO(R_68K_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", FALSE, 0, 0x000000ff,TRUE), 77 HOWTO(R_68K_GOT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", FALSE, 0, 0xffffffff,TRUE), 78 HOWTO(R_68K_GOT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", FALSE, 0, 0x0000ffff,TRUE), 79 HOWTO(R_68K_GOT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", FALSE, 0, 0x000000ff,TRUE), 80 HOWTO(R_68K_GOT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", FALSE, 0, 0xffffffff,FALSE), 81 HOWTO(R_68K_GOT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", FALSE, 0, 0x0000ffff,FALSE), 82 HOWTO(R_68K_GOT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", FALSE, 0, 0x000000ff,FALSE), 83 HOWTO(R_68K_PLT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", FALSE, 0, 0xffffffff,TRUE), 84 HOWTO(R_68K_PLT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", FALSE, 0, 0x0000ffff,TRUE), 85 HOWTO(R_68K_PLT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", FALSE, 0, 0x000000ff,TRUE), 86 HOWTO(R_68K_PLT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", FALSE, 0, 0xffffffff,FALSE), 87 HOWTO(R_68K_PLT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", FALSE, 0, 0x0000ffff,FALSE), 88 HOWTO(R_68K_PLT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", FALSE, 0, 0x000000ff,FALSE), 89 HOWTO(R_68K_COPY, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", FALSE, 0, 0xffffffff,FALSE), 90 HOWTO(R_68K_GLOB_DAT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", FALSE, 0, 0xffffffff,FALSE), 91 HOWTO(R_68K_JMP_SLOT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", FALSE, 0, 0xffffffff,FALSE), 92 HOWTO(R_68K_RELATIVE, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", FALSE, 0, 0xffffffff,FALSE), 93 /* GNU extension to record C++ vtable hierarchy. */ 94 HOWTO (R_68K_GNU_VTINHERIT, /* type */ 95 0, /* rightshift */ 96 2, /* size (0 = byte, 1 = short, 2 = long) */ 97 0, /* bitsize */ 98 FALSE, /* pc_relative */ 99 0, /* bitpos */ 100 complain_overflow_dont, /* complain_on_overflow */ 101 NULL, /* special_function */ 102 "R_68K_GNU_VTINHERIT", /* name */ 103 FALSE, /* partial_inplace */ 104 0, /* src_mask */ 105 0, /* dst_mask */ 106 FALSE), 107 /* GNU extension to record C++ vtable member usage. */ 108 HOWTO (R_68K_GNU_VTENTRY, /* type */ 109 0, /* rightshift */ 110 2, /* size (0 = byte, 1 = short, 2 = long) */ 111 0, /* bitsize */ 112 FALSE, /* pc_relative */ 113 0, /* bitpos */ 114 complain_overflow_dont, /* complain_on_overflow */ 115 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 116 "R_68K_GNU_VTENTRY", /* name */ 117 FALSE, /* partial_inplace */ 118 0, /* src_mask */ 119 0, /* dst_mask */ 120 FALSE), 121}; 122 123static void 124rtype_to_howto (abfd, cache_ptr, dst) 125 bfd *abfd ATTRIBUTE_UNUSED; 126 arelent *cache_ptr; 127 Elf_Internal_Rela *dst; 128{ 129 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max); 130 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)]; 131} 132 133#define elf_info_to_howto rtype_to_howto 134 135static const struct 136{ 137 bfd_reloc_code_real_type bfd_val; 138 int elf_val; 139} reloc_map[] = { 140 { BFD_RELOC_NONE, R_68K_NONE }, 141 { BFD_RELOC_32, R_68K_32 }, 142 { BFD_RELOC_16, R_68K_16 }, 143 { BFD_RELOC_8, R_68K_8 }, 144 { BFD_RELOC_32_PCREL, R_68K_PC32 }, 145 { BFD_RELOC_16_PCREL, R_68K_PC16 }, 146 { BFD_RELOC_8_PCREL, R_68K_PC8 }, 147 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, 148 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, 149 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, 150 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, 151 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, 152 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, 153 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, 154 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, 155 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, 156 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, 157 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, 158 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, 159 { BFD_RELOC_NONE, R_68K_COPY }, 160 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, 161 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, 162 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, 163 { BFD_RELOC_CTOR, R_68K_32 }, 164 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT }, 165 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY }, 166}; 167 168static reloc_howto_type * 169reloc_type_lookup (abfd, code) 170 bfd *abfd ATTRIBUTE_UNUSED; 171 bfd_reloc_code_real_type code; 172{ 173 unsigned int i; 174 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) 175 { 176 if (reloc_map[i].bfd_val == code) 177 return &howto_table[reloc_map[i].elf_val]; 178 } 179 return 0; 180} 181 182#define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup 183#define ELF_ARCH bfd_arch_m68k 184 185/* Functions for the m68k ELF linker. */ 186 187/* The name of the dynamic interpreter. This is put in the .interp 188 section. */ 189 190#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 191 192/* The size in bytes of an entry in the procedure linkage table. */ 193 194#define PLT_ENTRY_SIZE 20 195 196/* The first entry in a procedure linkage table looks like this. See 197 the SVR4 ABI m68k supplement to see how this works. */ 198 199static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = 200{ 201 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 202 0, 0, 0, 0, /* replaced with offset to .got + 4. */ 203 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ 204 0, 0, 0, 0, /* replaced with offset to .got + 8. */ 205 0, 0, 0, 0 /* pad out to 20 bytes. */ 206}; 207 208/* Subsequent entries in a procedure linkage table look like this. */ 209 210static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = 211{ 212 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */ 213 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */ 214 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 215 0, 0, 0, 0, /* replaced with offset into relocation table. */ 216 0x60, 0xff, /* bra.l .plt */ 217 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 218}; 219 220#define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32) 221 222#define PLT_CPU32_ENTRY_SIZE 24 223/* Procedure linkage table entries for the cpu32 */ 224static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] = 225{ 226 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 227 0, 0, 0, 0, /* replaced with offset to .got + 4. */ 228 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 229 0, 0, 0, 0, /* replace with offset to .got +8. */ 230 0x4e, 0xd1, /* jmp %a1@ */ 231 0, 0, 0, 0, /* pad out to 24 bytes. */ 232 0, 0 233}; 234 235static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] = 236{ 237 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 238 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */ 239 0x4e, 0xd1, /* jmp %a1@ */ 240 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 241 0, 0, 0, 0, /* replaced with offset into relocation table. */ 242 0x60, 0xff, /* bra.l .plt */ 243 0, 0, 0, 0, /* replaced with offset to start of .plt. */ 244 0, 0 245}; 246 247/* The m68k linker needs to keep track of the number of relocs that it 248 decides to copy in check_relocs for each symbol. This is so that it 249 can discard PC relative relocs if it doesn't need them when linking 250 with -Bsymbolic. We store the information in a field extending the 251 regular ELF linker hash table. */ 252 253/* This structure keeps track of the number of PC relative relocs we have 254 copied for a given symbol. */ 255 256struct elf_m68k_pcrel_relocs_copied 257{ 258 /* Next section. */ 259 struct elf_m68k_pcrel_relocs_copied *next; 260 /* A section in dynobj. */ 261 asection *section; 262 /* Number of relocs copied in this section. */ 263 bfd_size_type count; 264}; 265 266/* m68k ELF linker hash entry. */ 267 268struct elf_m68k_link_hash_entry 269{ 270 struct elf_link_hash_entry root; 271 272 /* Number of PC relative relocs copied for this symbol. */ 273 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied; 274}; 275 276#define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent)) 277 278/* m68k ELF linker hash table. */ 279 280struct elf_m68k_link_hash_table 281{ 282 struct elf_link_hash_table root; 283 284 /* Small local sym to section mapping cache. */ 285 struct sym_sec_cache sym_sec; 286}; 287 288/* Get the m68k ELF linker hash table from a link_info structure. */ 289 290#define elf_m68k_hash_table(p) \ 291 ((struct elf_m68k_link_hash_table *) (p)->hash) 292 293/* Create an entry in an m68k ELF linker hash table. */ 294 295static struct bfd_hash_entry * 296elf_m68k_link_hash_newfunc (entry, table, string) 297 struct bfd_hash_entry *entry; 298 struct bfd_hash_table *table; 299 const char *string; 300{ 301 struct bfd_hash_entry *ret = entry; 302 303 /* Allocate the structure if it has not already been allocated by a 304 subclass. */ 305 if (ret == NULL) 306 ret = bfd_hash_allocate (table, 307 sizeof (struct elf_m68k_link_hash_entry)); 308 if (ret == NULL) 309 return ret; 310 311 /* Call the allocation method of the superclass. */ 312 ret = _bfd_elf_link_hash_newfunc (ret, table, string); 313 if (ret != NULL) 314 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL; 315 316 return ret; 317} 318 319/* Create an m68k ELF linker hash table. */ 320 321static struct bfd_link_hash_table * 322elf_m68k_link_hash_table_create (abfd) 323 bfd *abfd; 324{ 325 struct elf_m68k_link_hash_table *ret; 326 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table); 327 328 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt); 329 if (ret == (struct elf_m68k_link_hash_table *) NULL) 330 return NULL; 331 332 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, 333 elf_m68k_link_hash_newfunc)) 334 { 335 free (ret); 336 return NULL; 337 } 338 339 ret->sym_sec.abfd = NULL; 340 341 return &ret->root.root; 342} 343 344/* Keep m68k-specific flags in the ELF header. */ 345static bfd_boolean 346elf32_m68k_set_private_flags (abfd, flags) 347 bfd *abfd; 348 flagword flags; 349{ 350 elf_elfheader (abfd)->e_flags = flags; 351 elf_flags_init (abfd) = TRUE; 352 return TRUE; 353} 354 355/* Merge backend specific data from an object file to the output 356 object file when linking. */ 357static bfd_boolean 358elf32_m68k_merge_private_bfd_data (ibfd, obfd) 359 bfd *ibfd; 360 bfd *obfd; 361{ 362 flagword out_flags; 363 flagword in_flags; 364 365 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 366 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 367 return TRUE; 368 369 in_flags = elf_elfheader (ibfd)->e_flags; 370 out_flags = elf_elfheader (obfd)->e_flags; 371 372 if (!elf_flags_init (obfd)) 373 { 374 elf_flags_init (obfd) = TRUE; 375 elf_elfheader (obfd)->e_flags = in_flags; 376 } 377 378 return TRUE; 379} 380 381/* Display the flags field. */ 382static bfd_boolean 383elf32_m68k_print_private_bfd_data (abfd, ptr) 384 bfd *abfd; 385 PTR ptr; 386{ 387 FILE *file = (FILE *) ptr; 388 389 BFD_ASSERT (abfd != NULL && ptr != NULL); 390 391 /* Print normal ELF private data. */ 392 _bfd_elf_print_private_bfd_data (abfd, ptr); 393 394 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ 395 396 /* xgettext:c-format */ 397 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 398 399 if (elf_elfheader (abfd)->e_flags & EF_CPU32) 400 fprintf (file, _(" [cpu32]")); 401 402 if (elf_elfheader (abfd)->e_flags & EF_M68000) 403 fprintf (file, _(" [m68000]")); 404 405 fputc ('\n', file); 406 407 return TRUE; 408} 409/* Look through the relocs for a section during the first phase, and 410 allocate space in the global offset table or procedure linkage 411 table. */ 412 413static bfd_boolean 414elf_m68k_check_relocs (abfd, info, sec, relocs) 415 bfd *abfd; 416 struct bfd_link_info *info; 417 asection *sec; 418 const Elf_Internal_Rela *relocs; 419{ 420 bfd *dynobj; 421 Elf_Internal_Shdr *symtab_hdr; 422 struct elf_link_hash_entry **sym_hashes; 423 bfd_signed_vma *local_got_refcounts; 424 const Elf_Internal_Rela *rel; 425 const Elf_Internal_Rela *rel_end; 426 asection *sgot; 427 asection *srelgot; 428 asection *sreloc; 429 430 if (info->relocatable) 431 return TRUE; 432 433 dynobj = elf_hash_table (info)->dynobj; 434 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 435 sym_hashes = elf_sym_hashes (abfd); 436 local_got_refcounts = elf_local_got_refcounts (abfd); 437 438 sgot = NULL; 439 srelgot = NULL; 440 sreloc = NULL; 441 442 rel_end = relocs + sec->reloc_count; 443 for (rel = relocs; rel < rel_end; rel++) 444 { 445 unsigned long r_symndx; 446 struct elf_link_hash_entry *h; 447 448 r_symndx = ELF32_R_SYM (rel->r_info); 449 450 if (r_symndx < symtab_hdr->sh_info) 451 h = NULL; 452 else 453 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 454 455 switch (ELF32_R_TYPE (rel->r_info)) 456 { 457 case R_68K_GOT8: 458 case R_68K_GOT16: 459 case R_68K_GOT32: 460 if (h != NULL 461 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 462 break; 463 /* Fall through. */ 464 case R_68K_GOT8O: 465 case R_68K_GOT16O: 466 case R_68K_GOT32O: 467 /* This symbol requires a global offset table entry. */ 468 469 if (dynobj == NULL) 470 { 471 /* Create the .got section. */ 472 elf_hash_table (info)->dynobj = dynobj = abfd; 473 if (!_bfd_elf_create_got_section (dynobj, info)) 474 return FALSE; 475 } 476 477 if (sgot == NULL) 478 { 479 sgot = bfd_get_section_by_name (dynobj, ".got"); 480 BFD_ASSERT (sgot != NULL); 481 } 482 483 if (srelgot == NULL 484 && (h != NULL || info->shared)) 485 { 486 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 487 if (srelgot == NULL) 488 { 489 srelgot = bfd_make_section (dynobj, ".rela.got"); 490 if (srelgot == NULL 491 || !bfd_set_section_flags (dynobj, srelgot, 492 (SEC_ALLOC 493 | SEC_LOAD 494 | SEC_HAS_CONTENTS 495 | SEC_IN_MEMORY 496 | SEC_LINKER_CREATED 497 | SEC_READONLY)) 498 || !bfd_set_section_alignment (dynobj, srelgot, 2)) 499 return FALSE; 500 } 501 } 502 503 if (h != NULL) 504 { 505 if (h->got.refcount == 0) 506 { 507 /* Make sure this symbol is output as a dynamic symbol. */ 508 if (h->dynindx == -1 509 && !h->forced_local) 510 { 511 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 512 return FALSE; 513 } 514 515 /* Allocate space in the .got section. */ 516 sgot->size += 4; 517 /* Allocate relocation space. */ 518 srelgot->size += sizeof (Elf32_External_Rela); 519 } 520 h->got.refcount++; 521 } 522 else 523 { 524 /* This is a global offset table entry for a local symbol. */ 525 if (local_got_refcounts == NULL) 526 { 527 bfd_size_type size; 528 529 size = symtab_hdr->sh_info; 530 size *= sizeof (bfd_signed_vma); 531 local_got_refcounts = ((bfd_signed_vma *) 532 bfd_zalloc (abfd, size)); 533 if (local_got_refcounts == NULL) 534 return FALSE; 535 elf_local_got_refcounts (abfd) = local_got_refcounts; 536 } 537 if (local_got_refcounts[r_symndx] == 0) 538 { 539 sgot->size += 4; 540 if (info->shared) 541 { 542 /* If we are generating a shared object, we need to 543 output a R_68K_RELATIVE reloc so that the dynamic 544 linker can adjust this GOT entry. */ 545 srelgot->size += sizeof (Elf32_External_Rela); 546 } 547 } 548 local_got_refcounts[r_symndx]++; 549 } 550 break; 551 552 case R_68K_PLT8: 553 case R_68K_PLT16: 554 case R_68K_PLT32: 555 /* This symbol requires a procedure linkage table entry. We 556 actually build the entry in adjust_dynamic_symbol, 557 because this might be a case of linking PIC code which is 558 never referenced by a dynamic object, in which case we 559 don't need to generate a procedure linkage table entry 560 after all. */ 561 562 /* If this is a local symbol, we resolve it directly without 563 creating a procedure linkage table entry. */ 564 if (h == NULL) 565 continue; 566 567 h->needs_plt = 1; 568 h->plt.refcount++; 569 break; 570 571 case R_68K_PLT8O: 572 case R_68K_PLT16O: 573 case R_68K_PLT32O: 574 /* This symbol requires a procedure linkage table entry. */ 575 576 if (h == NULL) 577 { 578 /* It does not make sense to have this relocation for a 579 local symbol. FIXME: does it? How to handle it if 580 it does make sense? */ 581 bfd_set_error (bfd_error_bad_value); 582 return FALSE; 583 } 584 585 /* Make sure this symbol is output as a dynamic symbol. */ 586 if (h->dynindx == -1 587 && !h->forced_local) 588 { 589 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 590 return FALSE; 591 } 592 593 h->needs_plt = 1; 594 h->plt.refcount++; 595 break; 596 597 case R_68K_PC8: 598 case R_68K_PC16: 599 case R_68K_PC32: 600 /* If we are creating a shared library and this is not a local 601 symbol, we need to copy the reloc into the shared library. 602 However when linking with -Bsymbolic and this is a global 603 symbol which is defined in an object we are including in the 604 link (i.e., DEF_REGULAR is set), then we can resolve the 605 reloc directly. At this point we have not seen all the input 606 files, so it is possible that DEF_REGULAR is not set now but 607 will be set later (it is never cleared). We account for that 608 possibility below by storing information in the 609 pcrel_relocs_copied field of the hash table entry. */ 610 if (!(info->shared 611 && (sec->flags & SEC_ALLOC) != 0 612 && h != NULL 613 && (!info->symbolic 614 || h->root.type == bfd_link_hash_defweak 615 || !h->def_regular))) 616 { 617 if (h != NULL) 618 { 619 /* Make sure a plt entry is created for this symbol if 620 it turns out to be a function defined by a dynamic 621 object. */ 622 h->plt.refcount++; 623 } 624 break; 625 } 626 /* Fall through. */ 627 case R_68K_8: 628 case R_68K_16: 629 case R_68K_32: 630 if (h != NULL) 631 { 632 /* Make sure a plt entry is created for this symbol if it 633 turns out to be a function defined by a dynamic object. */ 634 h->plt.refcount++; 635 } 636 637 /* If we are creating a shared library, we need to copy the 638 reloc into the shared library. */ 639 if (info->shared 640 && (sec->flags & SEC_ALLOC) != 0) 641 { 642 /* When creating a shared object, we must copy these 643 reloc types into the output file. We create a reloc 644 section in dynobj and make room for this reloc. */ 645 if (sreloc == NULL) 646 { 647 const char *name; 648 649 name = (bfd_elf_string_from_elf_section 650 (abfd, 651 elf_elfheader (abfd)->e_shstrndx, 652 elf_section_data (sec)->rel_hdr.sh_name)); 653 if (name == NULL) 654 return FALSE; 655 656 BFD_ASSERT (strncmp (name, ".rela", 5) == 0 657 && strcmp (bfd_get_section_name (abfd, sec), 658 name + 5) == 0); 659 660 sreloc = bfd_get_section_by_name (dynobj, name); 661 if (sreloc == NULL) 662 { 663 sreloc = bfd_make_section (dynobj, name); 664 if (sreloc == NULL 665 || !bfd_set_section_flags (dynobj, sreloc, 666 (SEC_ALLOC 667 | SEC_LOAD 668 | SEC_HAS_CONTENTS 669 | SEC_IN_MEMORY 670 | SEC_LINKER_CREATED 671 | SEC_READONLY)) 672 || !bfd_set_section_alignment (dynobj, sreloc, 2)) 673 return FALSE; 674 } 675 elf_section_data (sec)->sreloc = sreloc; 676 } 677 678 if (sec->flags & SEC_READONLY 679 /* Don't set DF_TEXTREL yet for PC relative 680 relocations, they might be discarded later. */ 681 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8 682 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 683 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)) 684 info->flags |= DF_TEXTREL; 685 686 sreloc->size += sizeof (Elf32_External_Rela); 687 688 /* We count the number of PC relative relocations we have 689 entered for this symbol, so that we can discard them 690 again if, in the -Bsymbolic case, the symbol is later 691 defined by a regular object, or, in the normal shared 692 case, the symbol is forced to be local. Note that this 693 function is only called if we are using an m68kelf linker 694 hash table, which means that h is really a pointer to an 695 elf_m68k_link_hash_entry. */ 696 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8 697 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 698 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32) 699 { 700 struct elf_m68k_pcrel_relocs_copied *p; 701 struct elf_m68k_pcrel_relocs_copied **head; 702 703 if (h != NULL) 704 { 705 struct elf_m68k_link_hash_entry *eh 706 = elf_m68k_hash_entry (h); 707 head = &eh->pcrel_relocs_copied; 708 } 709 else 710 { 711 asection *s; 712 s = (bfd_section_from_r_symndx 713 (abfd, &elf_m68k_hash_table (info)->sym_sec, 714 sec, r_symndx)); 715 if (s == NULL) 716 return FALSE; 717 718 head = ((struct elf_m68k_pcrel_relocs_copied **) 719 &elf_section_data (s)->local_dynrel); 720 } 721 722 for (p = *head; p != NULL; p = p->next) 723 if (p->section == sreloc) 724 break; 725 726 if (p == NULL) 727 { 728 p = ((struct elf_m68k_pcrel_relocs_copied *) 729 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 730 if (p == NULL) 731 return FALSE; 732 p->next = *head; 733 *head = p; 734 p->section = sreloc; 735 p->count = 0; 736 } 737 738 ++p->count; 739 } 740 } 741 742 break; 743 744 /* This relocation describes the C++ object vtable hierarchy. 745 Reconstruct it for later use during GC. */ 746 case R_68K_GNU_VTINHERIT: 747 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 748 return FALSE; 749 break; 750 751 /* This relocation describes which C++ vtable entries are actually 752 used. Record for later use during GC. */ 753 case R_68K_GNU_VTENTRY: 754 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 755 return FALSE; 756 break; 757 758 default: 759 break; 760 } 761 } 762 763 return TRUE; 764} 765 766/* Return the section that should be marked against GC for a given 767 relocation. */ 768 769static asection * 770elf_m68k_gc_mark_hook (sec, info, rel, h, sym) 771 asection *sec; 772 struct bfd_link_info *info ATTRIBUTE_UNUSED; 773 Elf_Internal_Rela *rel; 774 struct elf_link_hash_entry *h; 775 Elf_Internal_Sym *sym; 776{ 777 if (h != NULL) 778 { 779 switch (ELF32_R_TYPE (rel->r_info)) 780 { 781 case R_68K_GNU_VTINHERIT: 782 case R_68K_GNU_VTENTRY: 783 break; 784 785 default: 786 switch (h->root.type) 787 { 788 default: 789 break; 790 791 case bfd_link_hash_defined: 792 case bfd_link_hash_defweak: 793 return h->root.u.def.section; 794 795 case bfd_link_hash_common: 796 return h->root.u.c.p->section; 797 } 798 } 799 } 800 else 801 return bfd_section_from_elf_index (sec->owner, sym->st_shndx); 802 803 return NULL; 804} 805 806/* Update the got entry reference counts for the section being removed. */ 807 808static bfd_boolean 809elf_m68k_gc_sweep_hook (abfd, info, sec, relocs) 810 bfd *abfd; 811 struct bfd_link_info *info; 812 asection *sec; 813 const Elf_Internal_Rela *relocs; 814{ 815 Elf_Internal_Shdr *symtab_hdr; 816 struct elf_link_hash_entry **sym_hashes; 817 bfd_signed_vma *local_got_refcounts; 818 const Elf_Internal_Rela *rel, *relend; 819 bfd *dynobj; 820 asection *sgot; 821 asection *srelgot; 822 823 dynobj = elf_hash_table (info)->dynobj; 824 if (dynobj == NULL) 825 return TRUE; 826 827 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 828 sym_hashes = elf_sym_hashes (abfd); 829 local_got_refcounts = elf_local_got_refcounts (abfd); 830 831 sgot = bfd_get_section_by_name (dynobj, ".got"); 832 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 833 834 relend = relocs + sec->reloc_count; 835 for (rel = relocs; rel < relend; rel++) 836 { 837 unsigned long r_symndx; 838 struct elf_link_hash_entry *h; 839 840 switch (ELF32_R_TYPE (rel->r_info)) 841 { 842 case R_68K_GOT8: 843 case R_68K_GOT16: 844 case R_68K_GOT32: 845 case R_68K_GOT8O: 846 case R_68K_GOT16O: 847 case R_68K_GOT32O: 848 r_symndx = ELF32_R_SYM (rel->r_info); 849 if (r_symndx >= symtab_hdr->sh_info) 850 { 851 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 852 if (h->got.refcount > 0) 853 { 854 --h->got.refcount; 855 if (h->got.refcount == 0) 856 { 857 /* We don't need the .got entry any more. */ 858 sgot->size -= 4; 859 srelgot->size -= sizeof (Elf32_External_Rela); 860 } 861 } 862 } 863 else if (local_got_refcounts != NULL) 864 { 865 if (local_got_refcounts[r_symndx] > 0) 866 { 867 --local_got_refcounts[r_symndx]; 868 if (local_got_refcounts[r_symndx] == 0) 869 { 870 /* We don't need the .got entry any more. */ 871 sgot->size -= 4; 872 if (info->shared) 873 srelgot->size -= sizeof (Elf32_External_Rela); 874 } 875 } 876 } 877 break; 878 879 case R_68K_PLT8: 880 case R_68K_PLT16: 881 case R_68K_PLT32: 882 case R_68K_PLT8O: 883 case R_68K_PLT16O: 884 case R_68K_PLT32O: 885 case R_68K_PC8: 886 case R_68K_PC16: 887 case R_68K_PC32: 888 case R_68K_8: 889 case R_68K_16: 890 case R_68K_32: 891 r_symndx = ELF32_R_SYM (rel->r_info); 892 if (r_symndx >= symtab_hdr->sh_info) 893 { 894 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 895 if (h->plt.refcount > 0) 896 --h->plt.refcount; 897 } 898 break; 899 900 default: 901 break; 902 } 903 } 904 905 return TRUE; 906} 907 908/* Adjust a symbol defined by a dynamic object and referenced by a 909 regular object. The current definition is in some section of the 910 dynamic object, but we're not including those sections. We have to 911 change the definition to something the rest of the link can 912 understand. */ 913 914static bfd_boolean 915elf_m68k_adjust_dynamic_symbol (info, h) 916 struct bfd_link_info *info; 917 struct elf_link_hash_entry *h; 918{ 919 bfd *dynobj; 920 asection *s; 921 unsigned int power_of_two; 922 923 dynobj = elf_hash_table (info)->dynobj; 924 925 /* Make sure we know what is going on here. */ 926 BFD_ASSERT (dynobj != NULL 927 && (h->needs_plt 928 || h->u.weakdef != NULL 929 || (h->def_dynamic 930 && h->ref_regular 931 && !h->def_regular))); 932 933 /* If this is a function, put it in the procedure linkage table. We 934 will fill in the contents of the procedure linkage table later, 935 when we know the address of the .got section. */ 936 if (h->type == STT_FUNC 937 || h->needs_plt) 938 { 939 if (! info->shared 940 && !h->def_dynamic 941 && !h->ref_dynamic 942 /* We must always create the plt entry if it was referenced 943 by a PLTxxO relocation. In this case we already recorded 944 it as a dynamic symbol. */ 945 && h->dynindx == -1) 946 { 947 /* This case can occur if we saw a PLTxx reloc in an input 948 file, but the symbol was never referred to by a dynamic 949 object. In such a case, we don't actually need to build 950 a procedure linkage table, and we can just do a PCxx 951 reloc instead. */ 952 BFD_ASSERT (h->needs_plt); 953 h->plt.offset = (bfd_vma) -1; 954 return TRUE; 955 } 956 957 /* GC may have rendered this entry unused. */ 958 if (h->plt.refcount <= 0) 959 { 960 h->needs_plt = 0; 961 h->plt.offset = (bfd_vma) -1; 962 return TRUE; 963 } 964 965 /* Make sure this symbol is output as a dynamic symbol. */ 966 if (h->dynindx == -1 967 && !h->forced_local) 968 { 969 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 970 return FALSE; 971 } 972 973 s = bfd_get_section_by_name (dynobj, ".plt"); 974 BFD_ASSERT (s != NULL); 975 976 /* If this is the first .plt entry, make room for the special 977 first entry. */ 978 if (s->size == 0) 979 { 980 if (CPU32_FLAG (dynobj)) 981 s->size += PLT_CPU32_ENTRY_SIZE; 982 else 983 s->size += PLT_ENTRY_SIZE; 984 } 985 986 /* If this symbol is not defined in a regular file, and we are 987 not generating a shared library, then set the symbol to this 988 location in the .plt. This is required to make function 989 pointers compare as equal between the normal executable and 990 the shared library. */ 991 if (!info->shared 992 && !h->def_regular) 993 { 994 h->root.u.def.section = s; 995 h->root.u.def.value = s->size; 996 } 997 998 h->plt.offset = s->size; 999 1000 /* Make room for this entry. */ 1001 if (CPU32_FLAG (dynobj)) 1002 s->size += PLT_CPU32_ENTRY_SIZE; 1003 else 1004 s->size += PLT_ENTRY_SIZE; 1005 1006 /* We also need to make an entry in the .got.plt section, which 1007 will be placed in the .got section by the linker script. */ 1008 s = bfd_get_section_by_name (dynobj, ".got.plt"); 1009 BFD_ASSERT (s != NULL); 1010 s->size += 4; 1011 1012 /* We also need to make an entry in the .rela.plt section. */ 1013 s = bfd_get_section_by_name (dynobj, ".rela.plt"); 1014 BFD_ASSERT (s != NULL); 1015 s->size += sizeof (Elf32_External_Rela); 1016 1017 return TRUE; 1018 } 1019 1020 /* Reinitialize the plt offset now that it is not used as a reference 1021 count any more. */ 1022 h->plt.offset = (bfd_vma) -1; 1023 1024 /* If this is a weak symbol, and there is a real definition, the 1025 processor independent code will have arranged for us to see the 1026 real definition first, and we can just use the same value. */ 1027 if (h->u.weakdef != NULL) 1028 { 1029 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1030 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1031 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1032 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1033 return TRUE; 1034 } 1035 1036 /* This is a reference to a symbol defined by a dynamic object which 1037 is not a function. */ 1038 1039 /* If we are creating a shared library, we must presume that the 1040 only references to the symbol are via the global offset table. 1041 For such cases we need not do anything here; the relocations will 1042 be handled correctly by relocate_section. */ 1043 if (info->shared) 1044 return TRUE; 1045 1046 /* We must allocate the symbol in our .dynbss section, which will 1047 become part of the .bss section of the executable. There will be 1048 an entry for this symbol in the .dynsym section. The dynamic 1049 object will contain position independent code, so all references 1050 from the dynamic object to this symbol will go through the global 1051 offset table. The dynamic linker will use the .dynsym entry to 1052 determine the address it must put in the global offset table, so 1053 both the dynamic object and the regular object will refer to the 1054 same memory location for the variable. */ 1055 1056 s = bfd_get_section_by_name (dynobj, ".dynbss"); 1057 BFD_ASSERT (s != NULL); 1058 1059 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to 1060 copy the initial value out of the dynamic object and into the 1061 runtime process image. We need to remember the offset into the 1062 .rela.bss section we are going to use. */ 1063 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1064 { 1065 asection *srel; 1066 1067 srel = bfd_get_section_by_name (dynobj, ".rela.bss"); 1068 BFD_ASSERT (srel != NULL); 1069 srel->size += sizeof (Elf32_External_Rela); 1070 h->needs_copy = 1; 1071 } 1072 1073 /* We need to figure out the alignment required for this symbol. I 1074 have no idea how ELF linkers handle this. */ 1075 power_of_two = bfd_log2 (h->size); 1076 if (power_of_two > 3) 1077 power_of_two = 3; 1078 1079 /* Apply the required alignment. */ 1080 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 1081 if (power_of_two > bfd_get_section_alignment (dynobj, s)) 1082 { 1083 if (!bfd_set_section_alignment (dynobj, s, power_of_two)) 1084 return FALSE; 1085 } 1086 1087 /* Define the symbol as being at this point in the section. */ 1088 h->root.u.def.section = s; 1089 h->root.u.def.value = s->size; 1090 1091 /* Increment the section size to make room for the symbol. */ 1092 s->size += h->size; 1093 1094 return TRUE; 1095} 1096 1097/* Set the sizes of the dynamic sections. */ 1098 1099static bfd_boolean 1100elf_m68k_size_dynamic_sections (output_bfd, info) 1101 bfd *output_bfd ATTRIBUTE_UNUSED; 1102 struct bfd_link_info *info; 1103{ 1104 bfd *dynobj; 1105 asection *s; 1106 bfd_boolean plt; 1107 bfd_boolean relocs; 1108 1109 dynobj = elf_hash_table (info)->dynobj; 1110 BFD_ASSERT (dynobj != NULL); 1111 1112 if (elf_hash_table (info)->dynamic_sections_created) 1113 { 1114 /* Set the contents of the .interp section to the interpreter. */ 1115 if (info->executable) 1116 { 1117 s = bfd_get_section_by_name (dynobj, ".interp"); 1118 BFD_ASSERT (s != NULL); 1119 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1120 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1121 } 1122 } 1123 else 1124 { 1125 /* We may have created entries in the .rela.got section. 1126 However, if we are not creating the dynamic sections, we will 1127 not actually use these entries. Reset the size of .rela.got, 1128 which will cause it to get stripped from the output file 1129 below. */ 1130 s = bfd_get_section_by_name (dynobj, ".rela.got"); 1131 if (s != NULL) 1132 s->size = 0; 1133 } 1134 1135 /* If this is a -Bsymbolic shared link, then we need to discard all 1136 PC relative relocs against symbols defined in a regular object. 1137 For the normal shared case we discard the PC relative relocs 1138 against symbols that have become local due to visibility changes. 1139 We allocated space for them in the check_relocs routine, but we 1140 will not fill them in in the relocate_section routine. */ 1141 if (info->shared) 1142 elf_link_hash_traverse (elf_hash_table (info), 1143 elf_m68k_discard_copies, 1144 (PTR) info); 1145 1146 /* The check_relocs and adjust_dynamic_symbol entry points have 1147 determined the sizes of the various dynamic sections. Allocate 1148 memory for them. */ 1149 plt = FALSE; 1150 relocs = FALSE; 1151 for (s = dynobj->sections; s != NULL; s = s->next) 1152 { 1153 const char *name; 1154 bfd_boolean strip; 1155 1156 if ((s->flags & SEC_LINKER_CREATED) == 0) 1157 continue; 1158 1159 /* It's OK to base decisions on the section name, because none 1160 of the dynobj section names depend upon the input files. */ 1161 name = bfd_get_section_name (dynobj, s); 1162 1163 strip = FALSE; 1164 1165 if (strcmp (name, ".plt") == 0) 1166 { 1167 if (s->size == 0) 1168 { 1169 /* Strip this section if we don't need it; see the 1170 comment below. */ 1171 strip = TRUE; 1172 } 1173 else 1174 { 1175 /* Remember whether there is a PLT. */ 1176 plt = TRUE; 1177 } 1178 } 1179 else if (strncmp (name, ".rela", 5) == 0) 1180 { 1181 if (s->size == 0) 1182 { 1183 /* If we don't need this section, strip it from the 1184 output file. This is mostly to handle .rela.bss and 1185 .rela.plt. We must create both sections in 1186 create_dynamic_sections, because they must be created 1187 before the linker maps input sections to output 1188 sections. The linker does that before 1189 adjust_dynamic_symbol is called, and it is that 1190 function which decides whether anything needs to go 1191 into these sections. */ 1192 strip = TRUE; 1193 } 1194 else 1195 { 1196 relocs = TRUE; 1197 1198 /* We use the reloc_count field as a counter if we need 1199 to copy relocs into the output file. */ 1200 s->reloc_count = 0; 1201 } 1202 } 1203 else if (strncmp (name, ".got", 4) != 0) 1204 { 1205 /* It's not one of our sections, so don't allocate space. */ 1206 continue; 1207 } 1208 1209 if (strip) 1210 { 1211 _bfd_strip_section_from_output (info, s); 1212 continue; 1213 } 1214 1215 /* Allocate memory for the section contents. */ 1216 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. 1217 Unused entries should be reclaimed before the section's contents 1218 are written out, but at the moment this does not happen. Thus in 1219 order to prevent writing out garbage, we initialise the section's 1220 contents to zero. */ 1221 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 1222 if (s->contents == NULL && s->size != 0) 1223 return FALSE; 1224 } 1225 1226 if (elf_hash_table (info)->dynamic_sections_created) 1227 { 1228 /* Add some entries to the .dynamic section. We fill in the 1229 values later, in elf_m68k_finish_dynamic_sections, but we 1230 must add the entries now so that we get the correct size for 1231 the .dynamic section. The DT_DEBUG entry is filled in by the 1232 dynamic linker and used by the debugger. */ 1233#define add_dynamic_entry(TAG, VAL) \ 1234 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 1235 1236 if (!info->shared) 1237 { 1238 if (!add_dynamic_entry (DT_DEBUG, 0)) 1239 return FALSE; 1240 } 1241 1242 if (plt) 1243 { 1244 if (!add_dynamic_entry (DT_PLTGOT, 0) 1245 || !add_dynamic_entry (DT_PLTRELSZ, 0) 1246 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 1247 || !add_dynamic_entry (DT_JMPREL, 0)) 1248 return FALSE; 1249 } 1250 1251 if (relocs) 1252 { 1253 if (!add_dynamic_entry (DT_RELA, 0) 1254 || !add_dynamic_entry (DT_RELASZ, 0) 1255 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 1256 return FALSE; 1257 } 1258 1259 if ((info->flags & DF_TEXTREL) != 0) 1260 { 1261 if (!add_dynamic_entry (DT_TEXTREL, 0)) 1262 return FALSE; 1263 } 1264 } 1265#undef add_dynamic_entry 1266 1267 return TRUE; 1268} 1269 1270/* This function is called via elf_link_hash_traverse if we are 1271 creating a shared object. In the -Bsymbolic case it discards the 1272 space allocated to copy PC relative relocs against symbols which 1273 are defined in regular objects. For the normal shared case, it 1274 discards space for pc-relative relocs that have become local due to 1275 symbol visibility changes. We allocated space for them in the 1276 check_relocs routine, but we won't fill them in in the 1277 relocate_section routine. 1278 1279 We also check whether any of the remaining relocations apply 1280 against a readonly section, and set the DF_TEXTREL flag in this 1281 case. */ 1282 1283static bfd_boolean 1284elf_m68k_discard_copies (h, inf) 1285 struct elf_link_hash_entry *h; 1286 PTR inf; 1287{ 1288 struct bfd_link_info *info = (struct bfd_link_info *) inf; 1289 struct elf_m68k_pcrel_relocs_copied *s; 1290 1291 if (h->root.type == bfd_link_hash_warning) 1292 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1293 1294 if (!h->def_regular 1295 || (!info->symbolic 1296 && !h->forced_local)) 1297 { 1298 if ((info->flags & DF_TEXTREL) == 0) 1299 { 1300 /* Look for relocations against read-only sections. */ 1301 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 1302 s != NULL; 1303 s = s->next) 1304 if ((s->section->flags & SEC_READONLY) != 0) 1305 { 1306 info->flags |= DF_TEXTREL; 1307 break; 1308 } 1309 } 1310 1311 return TRUE; 1312 } 1313 1314 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 1315 s != NULL; 1316 s = s->next) 1317 s->section->size -= s->count * sizeof (Elf32_External_Rela); 1318 1319 return TRUE; 1320} 1321 1322/* Relocate an M68K ELF section. */ 1323 1324static bfd_boolean 1325elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section, 1326 contents, relocs, local_syms, local_sections) 1327 bfd *output_bfd; 1328 struct bfd_link_info *info; 1329 bfd *input_bfd; 1330 asection *input_section; 1331 bfd_byte *contents; 1332 Elf_Internal_Rela *relocs; 1333 Elf_Internal_Sym *local_syms; 1334 asection **local_sections; 1335{ 1336 bfd *dynobj; 1337 Elf_Internal_Shdr *symtab_hdr; 1338 struct elf_link_hash_entry **sym_hashes; 1339 bfd_vma *local_got_offsets; 1340 asection *sgot; 1341 asection *splt; 1342 asection *sreloc; 1343 Elf_Internal_Rela *rel; 1344 Elf_Internal_Rela *relend; 1345 1346 if (info->relocatable) 1347 return TRUE; 1348 1349 dynobj = elf_hash_table (info)->dynobj; 1350 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1351 sym_hashes = elf_sym_hashes (input_bfd); 1352 local_got_offsets = elf_local_got_offsets (input_bfd); 1353 1354 sgot = NULL; 1355 splt = NULL; 1356 sreloc = NULL; 1357 1358 rel = relocs; 1359 relend = relocs + input_section->reloc_count; 1360 for (; rel < relend; rel++) 1361 { 1362 int r_type; 1363 reloc_howto_type *howto; 1364 unsigned long r_symndx; 1365 struct elf_link_hash_entry *h; 1366 Elf_Internal_Sym *sym; 1367 asection *sec; 1368 bfd_vma relocation; 1369 bfd_boolean unresolved_reloc; 1370 bfd_reloc_status_type r; 1371 1372 r_type = ELF32_R_TYPE (rel->r_info); 1373 if (r_type < 0 || r_type >= (int) R_68K_max) 1374 { 1375 bfd_set_error (bfd_error_bad_value); 1376 return FALSE; 1377 } 1378 howto = howto_table + r_type; 1379 1380 r_symndx = ELF32_R_SYM (rel->r_info); 1381 1382 h = NULL; 1383 sym = NULL; 1384 sec = NULL; 1385 unresolved_reloc = FALSE; 1386 1387 if (r_symndx < symtab_hdr->sh_info) 1388 { 1389 sym = local_syms + r_symndx; 1390 sec = local_sections[r_symndx]; 1391 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1392 } 1393 else 1394 { 1395 bfd_boolean warned; 1396 1397 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1398 r_symndx, symtab_hdr, sym_hashes, 1399 h, sec, relocation, 1400 unresolved_reloc, warned); 1401 } 1402 1403 switch (r_type) 1404 { 1405 case R_68K_GOT8: 1406 case R_68K_GOT16: 1407 case R_68K_GOT32: 1408 /* Relocation is to the address of the entry for this symbol 1409 in the global offset table. */ 1410 if (h != NULL 1411 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 1412 break; 1413 /* Fall through. */ 1414 case R_68K_GOT8O: 1415 case R_68K_GOT16O: 1416 case R_68K_GOT32O: 1417 /* Relocation is the offset of the entry for this symbol in 1418 the global offset table. */ 1419 1420 { 1421 bfd_vma off; 1422 1423 if (sgot == NULL) 1424 { 1425 sgot = bfd_get_section_by_name (dynobj, ".got"); 1426 BFD_ASSERT (sgot != NULL); 1427 } 1428 1429 if (h != NULL) 1430 { 1431 bfd_boolean dyn; 1432 1433 off = h->got.offset; 1434 BFD_ASSERT (off != (bfd_vma) -1); 1435 1436 dyn = elf_hash_table (info)->dynamic_sections_created; 1437 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 1438 || (info->shared 1439 && (info->symbolic 1440 || h->dynindx == -1 1441 || h->forced_local) 1442 && h->def_regular)) 1443 { 1444 /* This is actually a static link, or it is a 1445 -Bsymbolic link and the symbol is defined 1446 locally, or the symbol was forced to be local 1447 because of a version file.. We must initialize 1448 this entry in the global offset table. Since 1449 the offset must always be a multiple of 4, we 1450 use the least significant bit to record whether 1451 we have initialized it already. 1452 1453 When doing a dynamic link, we create a .rela.got 1454 relocation entry to initialize the value. This 1455 is done in the finish_dynamic_symbol routine. */ 1456 if ((off & 1) != 0) 1457 off &= ~1; 1458 else 1459 { 1460 bfd_put_32 (output_bfd, relocation, 1461 sgot->contents + off); 1462 h->got.offset |= 1; 1463 } 1464 } 1465 else 1466 unresolved_reloc = FALSE; 1467 } 1468 else 1469 { 1470 BFD_ASSERT (local_got_offsets != NULL 1471 && local_got_offsets[r_symndx] != (bfd_vma) -1); 1472 1473 off = local_got_offsets[r_symndx]; 1474 1475 /* The offset must always be a multiple of 4. We use 1476 the least significant bit to record whether we have 1477 already generated the necessary reloc. */ 1478 if ((off & 1) != 0) 1479 off &= ~1; 1480 else 1481 { 1482 bfd_put_32 (output_bfd, relocation, sgot->contents + off); 1483 1484 if (info->shared) 1485 { 1486 asection *s; 1487 Elf_Internal_Rela outrel; 1488 bfd_byte *loc; 1489 1490 s = bfd_get_section_by_name (dynobj, ".rela.got"); 1491 BFD_ASSERT (s != NULL); 1492 1493 outrel.r_offset = (sgot->output_section->vma 1494 + sgot->output_offset 1495 + off); 1496 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 1497 outrel.r_addend = relocation; 1498 loc = s->contents; 1499 loc += s->reloc_count++ * sizeof (Elf32_External_Rela); 1500 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1501 } 1502 1503 local_got_offsets[r_symndx] |= 1; 1504 } 1505 } 1506 1507 relocation = sgot->output_offset + off; 1508 if (r_type == R_68K_GOT8O 1509 || r_type == R_68K_GOT16O 1510 || r_type == R_68K_GOT32O) 1511 { 1512 /* This relocation does not use the addend. */ 1513 rel->r_addend = 0; 1514 } 1515 else 1516 relocation += sgot->output_section->vma; 1517 } 1518 break; 1519 1520 case R_68K_PLT8: 1521 case R_68K_PLT16: 1522 case R_68K_PLT32: 1523 /* Relocation is to the entry for this symbol in the 1524 procedure linkage table. */ 1525 1526 /* Resolve a PLTxx reloc against a local symbol directly, 1527 without using the procedure linkage table. */ 1528 if (h == NULL) 1529 break; 1530 1531 if (h->plt.offset == (bfd_vma) -1 1532 || !elf_hash_table (info)->dynamic_sections_created) 1533 { 1534 /* We didn't make a PLT entry for this symbol. This 1535 happens when statically linking PIC code, or when 1536 using -Bsymbolic. */ 1537 break; 1538 } 1539 1540 if (splt == NULL) 1541 { 1542 splt = bfd_get_section_by_name (dynobj, ".plt"); 1543 BFD_ASSERT (splt != NULL); 1544 } 1545 1546 relocation = (splt->output_section->vma 1547 + splt->output_offset 1548 + h->plt.offset); 1549 unresolved_reloc = FALSE; 1550 break; 1551 1552 case R_68K_PLT8O: 1553 case R_68K_PLT16O: 1554 case R_68K_PLT32O: 1555 /* Relocation is the offset of the entry for this symbol in 1556 the procedure linkage table. */ 1557 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1); 1558 1559 if (splt == NULL) 1560 { 1561 splt = bfd_get_section_by_name (dynobj, ".plt"); 1562 BFD_ASSERT (splt != NULL); 1563 } 1564 1565 relocation = h->plt.offset; 1566 unresolved_reloc = FALSE; 1567 1568 /* This relocation does not use the addend. */ 1569 rel->r_addend = 0; 1570 1571 break; 1572 1573 case R_68K_PC8: 1574 case R_68K_PC16: 1575 case R_68K_PC32: 1576 if (h == NULL 1577 || (info->shared 1578 && h->forced_local)) 1579 break; 1580 /* Fall through. */ 1581 case R_68K_8: 1582 case R_68K_16: 1583 case R_68K_32: 1584 if (info->shared 1585 && r_symndx != 0 1586 && (input_section->flags & SEC_ALLOC) != 0 1587 && (h == NULL 1588 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1589 || h->root.type != bfd_link_hash_undefweak) 1590 && ((r_type != R_68K_PC8 1591 && r_type != R_68K_PC16 1592 && r_type != R_68K_PC32) 1593 || (h != NULL 1594 && h->dynindx != -1 1595 && (!info->symbolic 1596 || !h->def_regular)))) 1597 { 1598 Elf_Internal_Rela outrel; 1599 bfd_byte *loc; 1600 bfd_boolean skip, relocate; 1601 1602 /* When generating a shared object, these relocations 1603 are copied into the output file to be resolved at run 1604 time. */ 1605 1606 skip = FALSE; 1607 relocate = FALSE; 1608 1609 outrel.r_offset = 1610 _bfd_elf_section_offset (output_bfd, info, input_section, 1611 rel->r_offset); 1612 if (outrel.r_offset == (bfd_vma) -1) 1613 skip = TRUE; 1614 else if (outrel.r_offset == (bfd_vma) -2) 1615 skip = TRUE, relocate = TRUE; 1616 outrel.r_offset += (input_section->output_section->vma 1617 + input_section->output_offset); 1618 1619 if (skip) 1620 memset (&outrel, 0, sizeof outrel); 1621 else if (h != NULL 1622 && h->dynindx != -1 1623 && (r_type == R_68K_PC8 1624 || r_type == R_68K_PC16 1625 || r_type == R_68K_PC32 1626 || !info->shared 1627 || !info->symbolic 1628 || !h->def_regular)) 1629 { 1630 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1631 outrel.r_addend = rel->r_addend; 1632 } 1633 else 1634 { 1635 /* This symbol is local, or marked to become local. */ 1636 if (r_type == R_68K_32) 1637 { 1638 relocate = TRUE; 1639 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 1640 outrel.r_addend = relocation + rel->r_addend; 1641 } 1642 else 1643 { 1644 long indx; 1645 1646 if (bfd_is_abs_section (sec)) 1647 indx = 0; 1648 else if (sec == NULL || sec->owner == NULL) 1649 { 1650 bfd_set_error (bfd_error_bad_value); 1651 return FALSE; 1652 } 1653 else 1654 { 1655 asection *osec; 1656 1657 osec = sec->output_section; 1658 indx = elf_section_data (osec)->dynindx; 1659 BFD_ASSERT (indx > 0); 1660 } 1661 1662 outrel.r_info = ELF32_R_INFO (indx, r_type); 1663 outrel.r_addend = relocation + rel->r_addend; 1664 } 1665 } 1666 1667 sreloc = elf_section_data (input_section)->sreloc; 1668 if (sreloc == NULL) 1669 abort (); 1670 1671 loc = sreloc->contents; 1672 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1673 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1674 1675 /* This reloc will be computed at runtime, so there's no 1676 need to do anything now, except for R_68K_32 1677 relocations that have been turned into 1678 R_68K_RELATIVE. */ 1679 if (!relocate) 1680 continue; 1681 } 1682 1683 break; 1684 1685 case R_68K_GNU_VTINHERIT: 1686 case R_68K_GNU_VTENTRY: 1687 /* These are no-ops in the end. */ 1688 continue; 1689 1690 default: 1691 break; 1692 } 1693 1694 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 1695 because such sections are not SEC_ALLOC and thus ld.so will 1696 not process them. */ 1697 if (unresolved_reloc 1698 && !((input_section->flags & SEC_DEBUGGING) != 0 1699 && h->def_dynamic)) 1700 { 1701 (*_bfd_error_handler) 1702 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"), 1703 input_bfd, 1704 input_section, 1705 (long) rel->r_offset, 1706 h->root.root.string); 1707 return FALSE; 1708 } 1709 1710 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1711 contents, rel->r_offset, 1712 relocation, rel->r_addend); 1713 1714 if (r != bfd_reloc_ok) 1715 { 1716 const char *name; 1717 1718 if (h != NULL) 1719 name = h->root.root.string; 1720 else 1721 { 1722 name = bfd_elf_string_from_elf_section (input_bfd, 1723 symtab_hdr->sh_link, 1724 sym->st_name); 1725 if (name == NULL) 1726 return FALSE; 1727 if (*name == '\0') 1728 name = bfd_section_name (input_bfd, sec); 1729 } 1730 1731 if (r == bfd_reloc_overflow) 1732 { 1733 if (!(info->callbacks->reloc_overflow 1734 (info, name, howto->name, (bfd_vma) 0, 1735 input_bfd, input_section, rel->r_offset))) 1736 return FALSE; 1737 } 1738 else 1739 { 1740 (*_bfd_error_handler) 1741 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 1742 input_bfd, input_section, 1743 (long) rel->r_offset, name, (int) r); 1744 return FALSE; 1745 } 1746 } 1747 } 1748 1749 return TRUE; 1750} 1751 1752/* Finish up dynamic symbol handling. We set the contents of various 1753 dynamic sections here. */ 1754 1755static bfd_boolean 1756elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym) 1757 bfd *output_bfd; 1758 struct bfd_link_info *info; 1759 struct elf_link_hash_entry *h; 1760 Elf_Internal_Sym *sym; 1761{ 1762 bfd *dynobj; 1763 int plt_off1, plt_off2, plt_off3; 1764 1765 dynobj = elf_hash_table (info)->dynobj; 1766 1767 if (h->plt.offset != (bfd_vma) -1) 1768 { 1769 asection *splt; 1770 asection *sgot; 1771 asection *srela; 1772 bfd_vma plt_index; 1773 bfd_vma got_offset; 1774 Elf_Internal_Rela rela; 1775 bfd_byte *loc; 1776 1777 /* This symbol has an entry in the procedure linkage table. Set 1778 it up. */ 1779 1780 BFD_ASSERT (h->dynindx != -1); 1781 1782 splt = bfd_get_section_by_name (dynobj, ".plt"); 1783 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 1784 srela = bfd_get_section_by_name (dynobj, ".rela.plt"); 1785 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 1786 1787 /* Get the index in the procedure linkage table which 1788 corresponds to this symbol. This is the index of this symbol 1789 in all the symbols for which we are making plt entries. The 1790 first entry in the procedure linkage table is reserved. */ 1791 if ( CPU32_FLAG (output_bfd)) 1792 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1; 1793 else 1794 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1795 1796 /* Get the offset into the .got table of the entry that 1797 corresponds to this function. Each .got entry is 4 bytes. 1798 The first three are reserved. */ 1799 got_offset = (plt_index + 3) * 4; 1800 1801 if ( CPU32_FLAG (output_bfd)) 1802 { 1803 /* Fill in the entry in the procedure linkage table. */ 1804 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry, 1805 PLT_CPU32_ENTRY_SIZE); 1806 plt_off1 = 4; 1807 plt_off2 = 12; 1808 plt_off3 = 18; 1809 } 1810 else 1811 { 1812 /* Fill in the entry in the procedure linkage table. */ 1813 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry, 1814 PLT_ENTRY_SIZE); 1815 plt_off1 = 4; 1816 plt_off2 = 10; 1817 plt_off3 = 16; 1818 } 1819 1820 /* The offset is relative to the first extension word. */ 1821 bfd_put_32 (output_bfd, 1822 (sgot->output_section->vma 1823 + sgot->output_offset 1824 + got_offset 1825 - (splt->output_section->vma 1826 + h->plt.offset + 2)), 1827 splt->contents + h->plt.offset + plt_off1); 1828 1829 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 1830 splt->contents + h->plt.offset + plt_off2); 1831 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3), 1832 splt->contents + h->plt.offset + plt_off3); 1833 1834 /* Fill in the entry in the global offset table. */ 1835 bfd_put_32 (output_bfd, 1836 (splt->output_section->vma 1837 + splt->output_offset 1838 + h->plt.offset 1839 + 8), 1840 sgot->contents + got_offset); 1841 1842 /* Fill in the entry in the .rela.plt section. */ 1843 rela.r_offset = (sgot->output_section->vma 1844 + sgot->output_offset 1845 + got_offset); 1846 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT); 1847 rela.r_addend = 0; 1848 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 1849 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1850 1851 if (!h->def_regular) 1852 { 1853 /* Mark the symbol as undefined, rather than as defined in 1854 the .plt section. Leave the value alone. */ 1855 sym->st_shndx = SHN_UNDEF; 1856 } 1857 } 1858 1859 if (h->got.offset != (bfd_vma) -1) 1860 { 1861 asection *sgot; 1862 asection *srela; 1863 Elf_Internal_Rela rela; 1864 bfd_byte *loc; 1865 1866 /* This symbol has an entry in the global offset table. Set it 1867 up. */ 1868 1869 sgot = bfd_get_section_by_name (dynobj, ".got"); 1870 srela = bfd_get_section_by_name (dynobj, ".rela.got"); 1871 BFD_ASSERT (sgot != NULL && srela != NULL); 1872 1873 rela.r_offset = (sgot->output_section->vma 1874 + sgot->output_offset 1875 + (h->got.offset &~ (bfd_vma) 1)); 1876 1877 /* If this is a -Bsymbolic link, and the symbol is defined 1878 locally, we just want to emit a RELATIVE reloc. Likewise if 1879 the symbol was forced to be local because of a version file. 1880 The entry in the global offset table will already have been 1881 initialized in the relocate_section function. */ 1882 if (info->shared 1883 && (info->symbolic 1884 || h->dynindx == -1 1885 || h->forced_local) 1886 && h->def_regular) 1887 { 1888 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 1889 rela.r_addend = bfd_get_signed_32 (output_bfd, 1890 (sgot->contents 1891 + (h->got.offset &~ (bfd_vma) 1))); 1892 } 1893 else 1894 { 1895 bfd_put_32 (output_bfd, (bfd_vma) 0, 1896 sgot->contents + (h->got.offset &~ (bfd_vma) 1)); 1897 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); 1898 rela.r_addend = 0; 1899 } 1900 1901 loc = srela->contents; 1902 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 1903 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1904 } 1905 1906 if (h->needs_copy) 1907 { 1908 asection *s; 1909 Elf_Internal_Rela rela; 1910 bfd_byte *loc; 1911 1912 /* This symbol needs a copy reloc. Set it up. */ 1913 1914 BFD_ASSERT (h->dynindx != -1 1915 && (h->root.type == bfd_link_hash_defined 1916 || h->root.type == bfd_link_hash_defweak)); 1917 1918 s = bfd_get_section_by_name (h->root.u.def.section->owner, 1919 ".rela.bss"); 1920 BFD_ASSERT (s != NULL); 1921 1922 rela.r_offset = (h->root.u.def.value 1923 + h->root.u.def.section->output_section->vma 1924 + h->root.u.def.section->output_offset); 1925 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY); 1926 rela.r_addend = 0; 1927 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 1928 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1929 } 1930 1931 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 1932 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 1933 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 1934 sym->st_shndx = SHN_ABS; 1935 1936 return TRUE; 1937} 1938 1939/* Finish up the dynamic sections. */ 1940 1941static bfd_boolean 1942elf_m68k_finish_dynamic_sections (output_bfd, info) 1943 bfd *output_bfd; 1944 struct bfd_link_info *info; 1945{ 1946 bfd *dynobj; 1947 asection *sgot; 1948 asection *sdyn; 1949 1950 dynobj = elf_hash_table (info)->dynobj; 1951 1952 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 1953 BFD_ASSERT (sgot != NULL); 1954 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 1955 1956 if (elf_hash_table (info)->dynamic_sections_created) 1957 { 1958 asection *splt; 1959 Elf32_External_Dyn *dyncon, *dynconend; 1960 1961 splt = bfd_get_section_by_name (dynobj, ".plt"); 1962 BFD_ASSERT (splt != NULL && sdyn != NULL); 1963 1964 dyncon = (Elf32_External_Dyn *) sdyn->contents; 1965 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 1966 for (; dyncon < dynconend; dyncon++) 1967 { 1968 Elf_Internal_Dyn dyn; 1969 const char *name; 1970 asection *s; 1971 1972 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 1973 1974 switch (dyn.d_tag) 1975 { 1976 default: 1977 break; 1978 1979 case DT_PLTGOT: 1980 name = ".got"; 1981 goto get_vma; 1982 case DT_JMPREL: 1983 name = ".rela.plt"; 1984 get_vma: 1985 s = bfd_get_section_by_name (output_bfd, name); 1986 BFD_ASSERT (s != NULL); 1987 dyn.d_un.d_ptr = s->vma; 1988 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1989 break; 1990 1991 case DT_PLTRELSZ: 1992 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 1993 BFD_ASSERT (s != NULL); 1994 dyn.d_un.d_val = s->size; 1995 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1996 break; 1997 1998 case DT_RELASZ: 1999 /* The procedure linkage table relocs (DT_JMPREL) should 2000 not be included in the overall relocs (DT_RELA). 2001 Therefore, we override the DT_RELASZ entry here to 2002 make it not include the JMPREL relocs. Since the 2003 linker script arranges for .rela.plt to follow all 2004 other relocation sections, we don't have to worry 2005 about changing the DT_RELA entry. */ 2006 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2007 if (s != NULL) 2008 dyn.d_un.d_val -= s->size; 2009 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2010 break; 2011 } 2012 } 2013 2014 /* Fill in the first entry in the procedure linkage table. */ 2015 if (splt->size > 0) 2016 { 2017 if (!CPU32_FLAG (output_bfd)) 2018 { 2019 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE); 2020 bfd_put_32 (output_bfd, 2021 (sgot->output_section->vma 2022 + sgot->output_offset + 4 2023 - (splt->output_section->vma + 2)), 2024 splt->contents + 4); 2025 bfd_put_32 (output_bfd, 2026 (sgot->output_section->vma 2027 + sgot->output_offset + 8 2028 - (splt->output_section->vma + 10)), 2029 splt->contents + 12); 2030 elf_section_data (splt->output_section)->this_hdr.sh_entsize 2031 = PLT_ENTRY_SIZE; 2032 } 2033 else /* cpu32 */ 2034 { 2035 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE); 2036 bfd_put_32 (output_bfd, 2037 (sgot->output_section->vma 2038 + sgot->output_offset + 4 2039 - (splt->output_section->vma + 2)), 2040 splt->contents + 4); 2041 bfd_put_32 (output_bfd, 2042 (sgot->output_section->vma 2043 + sgot->output_offset + 8 2044 - (splt->output_section->vma + 10)), 2045 splt->contents + 12); 2046 elf_section_data (splt->output_section)->this_hdr.sh_entsize 2047 = PLT_CPU32_ENTRY_SIZE; 2048 } 2049 } 2050 } 2051 2052 /* Fill in the first three entries in the global offset table. */ 2053 if (sgot->size > 0) 2054 { 2055 if (sdyn == NULL) 2056 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 2057 else 2058 bfd_put_32 (output_bfd, 2059 sdyn->output_section->vma + sdyn->output_offset, 2060 sgot->contents); 2061 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 2062 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 2063 } 2064 2065 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2066 2067 return TRUE; 2068} 2069 2070/* Given a .data section and a .emreloc in-memory section, store 2071 relocation information into the .emreloc section which can be 2072 used at runtime to relocate the section. This is called by the 2073 linker when the --embedded-relocs switch is used. This is called 2074 after the add_symbols entry point has been called for all the 2075 objects, and before the final_link entry point is called. */ 2076 2077bfd_boolean 2078bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg) 2079 bfd *abfd; 2080 struct bfd_link_info *info; 2081 asection *datasec; 2082 asection *relsec; 2083 char **errmsg; 2084{ 2085 Elf_Internal_Shdr *symtab_hdr; 2086 Elf_Internal_Sym *isymbuf = NULL; 2087 Elf_Internal_Rela *internal_relocs = NULL; 2088 Elf_Internal_Rela *irel, *irelend; 2089 bfd_byte *p; 2090 bfd_size_type amt; 2091 2092 BFD_ASSERT (! info->relocatable); 2093 2094 *errmsg = NULL; 2095 2096 if (datasec->reloc_count == 0) 2097 return TRUE; 2098 2099 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2100 2101 /* Get a copy of the native relocations. */ 2102 internal_relocs = (_bfd_elf_link_read_relocs 2103 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL, 2104 info->keep_memory)); 2105 if (internal_relocs == NULL) 2106 goto error_return; 2107 2108 amt = (bfd_size_type) datasec->reloc_count * 12; 2109 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 2110 if (relsec->contents == NULL) 2111 goto error_return; 2112 2113 p = relsec->contents; 2114 2115 irelend = internal_relocs + datasec->reloc_count; 2116 for (irel = internal_relocs; irel < irelend; irel++, p += 12) 2117 { 2118 asection *targetsec; 2119 2120 /* We are going to write a four byte longword into the runtime 2121 reloc section. The longword will be the address in the data 2122 section which must be relocated. It is followed by the name 2123 of the target section NUL-padded or truncated to 8 2124 characters. */ 2125 2126 /* We can only relocate absolute longword relocs at run time. */ 2127 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32) 2128 { 2129 *errmsg = _("unsupported reloc type"); 2130 bfd_set_error (bfd_error_bad_value); 2131 goto error_return; 2132 } 2133 2134 /* Get the target section referred to by the reloc. */ 2135 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2136 { 2137 /* A local symbol. */ 2138 Elf_Internal_Sym *isym; 2139 2140 /* Read this BFD's local symbols if we haven't done so already. */ 2141 if (isymbuf == NULL) 2142 { 2143 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2144 if (isymbuf == NULL) 2145 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2146 symtab_hdr->sh_info, 0, 2147 NULL, NULL, NULL); 2148 if (isymbuf == NULL) 2149 goto error_return; 2150 } 2151 2152 isym = isymbuf + ELF32_R_SYM (irel->r_info); 2153 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2154 } 2155 else 2156 { 2157 unsigned long indx; 2158 struct elf_link_hash_entry *h; 2159 2160 /* An external symbol. */ 2161 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2162 h = elf_sym_hashes (abfd)[indx]; 2163 BFD_ASSERT (h != NULL); 2164 if (h->root.type == bfd_link_hash_defined 2165 || h->root.type == bfd_link_hash_defweak) 2166 targetsec = h->root.u.def.section; 2167 else 2168 targetsec = NULL; 2169 } 2170 2171 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 2172 memset (p + 4, 0, 8); 2173 if (targetsec != NULL) 2174 strncpy (p + 4, targetsec->output_section->name, 8); 2175 } 2176 2177 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 2178 free (isymbuf); 2179 if (internal_relocs != NULL 2180 && elf_section_data (datasec)->relocs != internal_relocs) 2181 free (internal_relocs); 2182 return TRUE; 2183 2184error_return: 2185 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 2186 free (isymbuf); 2187 if (internal_relocs != NULL 2188 && elf_section_data (datasec)->relocs != internal_relocs) 2189 free (internal_relocs); 2190 return FALSE; 2191} 2192 2193static enum elf_reloc_type_class 2194elf32_m68k_reloc_type_class (rela) 2195 const Elf_Internal_Rela *rela; 2196{ 2197 switch ((int) ELF32_R_TYPE (rela->r_info)) 2198 { 2199 case R_68K_RELATIVE: 2200 return reloc_class_relative; 2201 case R_68K_JMP_SLOT: 2202 return reloc_class_plt; 2203 case R_68K_COPY: 2204 return reloc_class_copy; 2205 default: 2206 return reloc_class_normal; 2207 } 2208} 2209 2210#define TARGET_BIG_SYM bfd_elf32_m68k_vec 2211#define TARGET_BIG_NAME "elf32-m68k" 2212#define ELF_MACHINE_CODE EM_68K 2213#define ELF_MAXPAGESIZE 0x2000 2214#define elf_backend_create_dynamic_sections \ 2215 _bfd_elf_create_dynamic_sections 2216#define bfd_elf32_bfd_link_hash_table_create \ 2217 elf_m68k_link_hash_table_create 2218#define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link 2219 2220#define elf_backend_check_relocs elf_m68k_check_relocs 2221#define elf_backend_adjust_dynamic_symbol \ 2222 elf_m68k_adjust_dynamic_symbol 2223#define elf_backend_size_dynamic_sections \ 2224 elf_m68k_size_dynamic_sections 2225#define elf_backend_relocate_section elf_m68k_relocate_section 2226#define elf_backend_finish_dynamic_symbol \ 2227 elf_m68k_finish_dynamic_symbol 2228#define elf_backend_finish_dynamic_sections \ 2229 elf_m68k_finish_dynamic_sections 2230#define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook 2231#define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook 2232#define bfd_elf32_bfd_merge_private_bfd_data \ 2233 elf32_m68k_merge_private_bfd_data 2234#define bfd_elf32_bfd_set_private_flags \ 2235 elf32_m68k_set_private_flags 2236#define bfd_elf32_bfd_print_private_bfd_data \ 2237 elf32_m68k_print_private_bfd_data 2238#define elf_backend_reloc_type_class elf32_m68k_reloc_type_class 2239 2240#define elf_backend_can_gc_sections 1 2241#define elf_backend_can_refcount 1 2242#define elf_backend_want_got_plt 1 2243#define elf_backend_plt_readonly 1 2244#define elf_backend_want_plt_sym 0 2245#define elf_backend_got_header_size 12 2246#define elf_backend_rela_normal 1 2247 2248#include "elf32-target.h" 2249