| 1 | /* 32-bit ELF support for ARM |
| 2 | Copyright 1998, 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 | #ifndef USE_REL |
| 22 | #define USE_REL 0 |
| 23 | #endif |
| 24 | |
| 25 | typedef unsigned long int insn32; |
| 26 | typedef unsigned short int insn16; |
| 27 | |
| 28 | static bfd_boolean elf32_arm_set_private_flags |
| 29 | PARAMS ((bfd *, flagword)); |
| 30 | static bfd_boolean elf32_arm_copy_private_bfd_data |
| 31 | PARAMS ((bfd *, bfd *)); |
| 32 | static bfd_boolean elf32_arm_merge_private_bfd_data |
| 33 | PARAMS ((bfd *, bfd *)); |
| 34 | static bfd_boolean elf32_arm_print_private_bfd_data |
| 35 | PARAMS ((bfd *, PTR)); |
| 36 | static int elf32_arm_get_symbol_type |
| 37 | PARAMS (( Elf_Internal_Sym *, int)); |
| 38 | static struct bfd_link_hash_table *elf32_arm_link_hash_table_create |
| 39 | PARAMS ((bfd *)); |
| 40 | static bfd_reloc_status_type elf32_arm_final_link_relocate |
| 41 | PARAMS ((reloc_howto_type *, bfd *, bfd *, asection *, bfd_byte *, |
| 42 | Elf_Internal_Rela *, bfd_vma, struct bfd_link_info *, asection *, |
| 43 | const char *, int, struct elf_link_hash_entry *)); |
| 44 | static insn32 insert_thumb_branch |
| 45 | PARAMS ((insn32, int)); |
| 46 | static struct elf_link_hash_entry *find_thumb_glue |
| 47 | PARAMS ((struct bfd_link_info *, const char *, bfd *)); |
| 48 | static struct elf_link_hash_entry *find_arm_glue |
| 49 | PARAMS ((struct bfd_link_info *, const char *, bfd *)); |
| 50 | static void elf32_arm_post_process_headers |
| 51 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 52 | static int elf32_arm_to_thumb_stub |
| 53 | PARAMS ((struct bfd_link_info *, const char *, bfd *, bfd *, asection *, |
| 54 | bfd_byte *, asection *, bfd_vma, bfd_signed_vma, bfd_vma)); |
| 55 | static int elf32_thumb_to_arm_stub |
| 56 | PARAMS ((struct bfd_link_info *, const char *, bfd *, bfd *, asection *, |
| 57 | bfd_byte *, asection *, bfd_vma, bfd_signed_vma, bfd_vma)); |
| 58 | static bfd_boolean elf32_arm_relocate_section |
| 59 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 60 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 61 | static asection * elf32_arm_gc_mark_hook |
| 62 | PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 63 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); |
| 64 | static bfd_boolean elf32_arm_gc_sweep_hook |
| 65 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 66 | const Elf_Internal_Rela *)); |
| 67 | static bfd_boolean elf32_arm_check_relocs |
| 68 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 69 | const Elf_Internal_Rela *)); |
| 70 | static bfd_boolean elf32_arm_find_nearest_line |
| 71 | PARAMS ((bfd *, asection *, asymbol **, bfd_vma, const char **, |
| 72 | const char **, unsigned int *)); |
| 73 | static bfd_boolean elf32_arm_adjust_dynamic_symbol |
| 74 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 75 | static bfd_boolean elf32_arm_size_dynamic_sections |
| 76 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 77 | static bfd_boolean elf32_arm_finish_dynamic_symbol |
| 78 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, |
| 79 | Elf_Internal_Sym *)); |
| 80 | static bfd_boolean elf32_arm_finish_dynamic_sections |
| 81 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 82 | static struct bfd_hash_entry * elf32_arm_link_hash_newfunc |
| 83 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); |
| 84 | #if USE_REL |
| 85 | static void arm_add_to_rel |
| 86 | PARAMS ((bfd *, bfd_byte *, reloc_howto_type *, bfd_signed_vma)); |
| 87 | #endif |
| 88 | static bfd_boolean allocate_dynrelocs |
| 89 | PARAMS ((struct elf_link_hash_entry *h, PTR inf)); |
| 90 | static bfd_boolean create_got_section |
| 91 | PARAMS ((bfd * dynobj, struct bfd_link_info * info)); |
| 92 | static bfd_boolean elf32_arm_create_dynamic_sections |
| 93 | PARAMS ((bfd * dynobj, struct bfd_link_info * info)); |
| 94 | static enum elf_reloc_type_class elf32_arm_reloc_type_class |
| 95 | PARAMS ((const Elf_Internal_Rela *)); |
| 96 | static bfd_boolean elf32_arm_object_p |
| 97 | PARAMS ((bfd *)); |
| 98 | |
| 99 | #ifndef ELFARM_NABI_C_INCLUDED |
| 100 | static void record_arm_to_thumb_glue |
| 101 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 102 | static void record_thumb_to_arm_glue |
| 103 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 104 | bfd_boolean bfd_elf32_arm_allocate_interworking_sections |
| 105 | PARAMS ((struct bfd_link_info *)); |
| 106 | bfd_boolean bfd_elf32_arm_get_bfd_for_interworking |
| 107 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 108 | bfd_boolean bfd_elf32_arm_process_before_allocation |
| 109 | PARAMS ((bfd *, struct bfd_link_info *, int, int)); |
| 110 | #endif |
| 111 | |
| 112 | |
| 113 | #define INTERWORK_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK) |
| 114 | |
| 115 | /* The linker script knows the section names for placement. |
| 116 | The entry_names are used to do simple name mangling on the stubs. |
| 117 | Given a function name, and its type, the stub can be found. The |
| 118 | name can be changed. The only requirement is the %s be present. */ |
| 119 | #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" |
| 120 | #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" |
| 121 | |
| 122 | #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" |
| 123 | #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" |
| 124 | |
| 125 | /* The name of the dynamic interpreter. This is put in the .interp |
| 126 | section. */ |
| 127 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" |
| 128 | |
| 129 | #ifdef FOUR_WORD_PLT |
| 130 | |
| 131 | /* The size in bytes of the special first entry in the procedure |
| 132 | linkage table. */ |
| 133 | #define PLT_HEADER_SIZE 16 |
| 134 | |
| 135 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 136 | #define PLT_ENTRY_SIZE 16 |
| 137 | |
| 138 | /* The first entry in a procedure linkage table looks like |
| 139 | this. It is set up so that any shared library function that is |
| 140 | called before the relocation has been set up calls the dynamic |
| 141 | linker first. */ |
| 142 | static const bfd_vma elf32_arm_plt0_entry [PLT_HEADER_SIZE / 4] = |
| 143 | { |
| 144 | 0xe52de004, /* str lr, [sp, #-4]! */ |
| 145 | 0xe59fe010, /* ldr lr, [pc, #16] */ |
| 146 | 0xe08fe00e, /* add lr, pc, lr */ |
| 147 | 0xe5bef008, /* ldr pc, [lr, #8]! */ |
| 148 | }; |
| 149 | |
| 150 | /* Subsequent entries in a procedure linkage table look like |
| 151 | this. */ |
| 152 | static const bfd_vma elf32_arm_plt_entry [PLT_ENTRY_SIZE / 4] = |
| 153 | { |
| 154 | 0xe28fc600, /* add ip, pc, #NN */ |
| 155 | 0xe28cca00, /* add ip, ip, #NN */ |
| 156 | 0xe5bcf000, /* ldr pc, [ip, #NN]! */ |
| 157 | 0x00000000, /* unused */ |
| 158 | }; |
| 159 | |
| 160 | #else |
| 161 | |
| 162 | /* The size in bytes of the special first entry in the procedure |
| 163 | linkage table. */ |
| 164 | #define PLT_HEADER_SIZE 20 |
| 165 | |
| 166 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 167 | #define PLT_ENTRY_SIZE 12 |
| 168 | |
| 169 | /* The first entry in a procedure linkage table looks like |
| 170 | this. It is set up so that any shared library function that is |
| 171 | called before the relocation has been set up calls the dynamic |
| 172 | linker first. */ |
| 173 | static const bfd_vma elf32_arm_plt0_entry [PLT_HEADER_SIZE / 4] = |
| 174 | { |
| 175 | 0xe52de004, /* str lr, [sp, #-4]! */ |
| 176 | 0xe59fe004, /* ldr lr, [pc, #4] */ |
| 177 | 0xe08fe00e, /* add lr, pc, lr */ |
| 178 | 0xe5bef008, /* ldr pc, [lr, #8]! */ |
| 179 | 0x00000000, /* &GOT[0] - . */ |
| 180 | }; |
| 181 | |
| 182 | /* Subsequent entries in a procedure linkage table look like |
| 183 | this. */ |
| 184 | static const bfd_vma elf32_arm_plt_entry [PLT_ENTRY_SIZE / 4] = |
| 185 | { |
| 186 | 0xe28fc600, /* add ip, pc, #0xNN00000 */ |
| 187 | 0xe28cca00, /* add ip, ip, #0xNN000 */ |
| 188 | 0xe5bcf000, /* ldr pc, [ip, #0xNNN]! */ |
| 189 | }; |
| 190 | |
| 191 | #endif |
| 192 | |
| 193 | /* Used to build a map of a section. This is required for mixed-endian |
| 194 | code/data. */ |
| 195 | |
| 196 | typedef struct elf32_elf_section_map |
| 197 | { |
| 198 | bfd_vma vma; |
| 199 | char type; |
| 200 | } |
| 201 | elf32_arm_section_map; |
| 202 | |
| 203 | struct _arm_elf_section_data |
| 204 | { |
| 205 | struct bfd_elf_section_data elf; |
| 206 | int mapcount; |
| 207 | elf32_arm_section_map *map; |
| 208 | }; |
| 209 | |
| 210 | #define elf32_arm_section_data(sec) \ |
| 211 | ((struct _arm_elf_section_data *) elf_section_data (sec)) |
| 212 | |
| 213 | /* The ARM linker needs to keep track of the number of relocs that it |
| 214 | decides to copy in check_relocs for each symbol. This is so that |
| 215 | it can discard PC relative relocs if it doesn't need them when |
| 216 | linking with -Bsymbolic. We store the information in a field |
| 217 | extending the regular ELF linker hash table. */ |
| 218 | |
| 219 | /* This structure keeps track of the number of PC relative relocs we |
| 220 | have copied for a given symbol. */ |
| 221 | struct elf32_arm_relocs_copied |
| 222 | { |
| 223 | /* Next section. */ |
| 224 | struct elf32_arm_relocs_copied * next; |
| 225 | /* A section in dynobj. */ |
| 226 | asection * section; |
| 227 | /* Number of relocs copied in this section. */ |
| 228 | bfd_size_type count; |
| 229 | }; |
| 230 | |
| 231 | /* Arm ELF linker hash entry. */ |
| 232 | struct elf32_arm_link_hash_entry |
| 233 | { |
| 234 | struct elf_link_hash_entry root; |
| 235 | |
| 236 | /* Number of PC relative relocs copied for this symbol. */ |
| 237 | struct elf32_arm_relocs_copied * relocs_copied; |
| 238 | }; |
| 239 | |
| 240 | /* Traverse an arm ELF linker hash table. */ |
| 241 | #define elf32_arm_link_hash_traverse(table, func, info) \ |
| 242 | (elf_link_hash_traverse \ |
| 243 | (&(table)->root, \ |
| 244 | (bfd_boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ |
| 245 | (info))) |
| 246 | |
| 247 | /* Get the ARM elf linker hash table from a link_info structure. */ |
| 248 | #define elf32_arm_hash_table(info) \ |
| 249 | ((struct elf32_arm_link_hash_table *) ((info)->hash)) |
| 250 | |
| 251 | /* ARM ELF linker hash table. */ |
| 252 | struct elf32_arm_link_hash_table |
| 253 | { |
| 254 | /* The main hash table. */ |
| 255 | struct elf_link_hash_table root; |
| 256 | |
| 257 | /* The size in bytes of the section containing the Thumb-to-ARM glue. */ |
| 258 | bfd_size_type thumb_glue_size; |
| 259 | |
| 260 | /* The size in bytes of the section containing the ARM-to-Thumb glue. */ |
| 261 | bfd_size_type arm_glue_size; |
| 262 | |
| 263 | /* An arbitrary input BFD chosen to hold the glue sections. */ |
| 264 | bfd * bfd_of_glue_owner; |
| 265 | |
| 266 | /* A boolean indicating whether knowledge of the ARM's pipeline |
| 267 | length should be applied by the linker. */ |
| 268 | int no_pipeline_knowledge; |
| 269 | |
| 270 | /* Nonzero to output a BE8 image. */ |
| 271 | int byteswap_code; |
| 272 | |
| 273 | /* Short-cuts to get to dynamic linker sections. */ |
| 274 | asection *sgot; |
| 275 | asection *sgotplt; |
| 276 | asection *srelgot; |
| 277 | asection *splt; |
| 278 | asection *srelplt; |
| 279 | asection *sdynbss; |
| 280 | asection *srelbss; |
| 281 | |
| 282 | /* Small local sym to section mapping cache. */ |
| 283 | struct sym_sec_cache sym_sec; |
| 284 | }; |
| 285 | |
| 286 | /* Create an entry in an ARM ELF linker hash table. */ |
| 287 | |
| 288 | static struct bfd_hash_entry * |
| 289 | elf32_arm_link_hash_newfunc (entry, table, string) |
| 290 | struct bfd_hash_entry * entry; |
| 291 | struct bfd_hash_table * table; |
| 292 | const char * string; |
| 293 | { |
| 294 | struct elf32_arm_link_hash_entry * ret = |
| 295 | (struct elf32_arm_link_hash_entry *) entry; |
| 296 | |
| 297 | /* Allocate the structure if it has not already been allocated by a |
| 298 | subclass. */ |
| 299 | if (ret == (struct elf32_arm_link_hash_entry *) NULL) |
| 300 | ret = ((struct elf32_arm_link_hash_entry *) |
| 301 | bfd_hash_allocate (table, |
| 302 | sizeof (struct elf32_arm_link_hash_entry))); |
| 303 | if (ret == (struct elf32_arm_link_hash_entry *) NULL) |
| 304 | return (struct bfd_hash_entry *) ret; |
| 305 | |
| 306 | /* Call the allocation method of the superclass. */ |
| 307 | ret = ((struct elf32_arm_link_hash_entry *) |
| 308 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, |
| 309 | table, string)); |
| 310 | if (ret != (struct elf32_arm_link_hash_entry *) NULL) |
| 311 | ret->relocs_copied = NULL; |
| 312 | |
| 313 | return (struct bfd_hash_entry *) ret; |
| 314 | } |
| 315 | |
| 316 | /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up |
| 317 | shortcuts to them in our hash table. */ |
| 318 | |
| 319 | static bfd_boolean |
| 320 | create_got_section (dynobj, info) |
| 321 | bfd *dynobj; |
| 322 | struct bfd_link_info *info; |
| 323 | { |
| 324 | struct elf32_arm_link_hash_table *htab; |
| 325 | |
| 326 | if (! _bfd_elf_create_got_section (dynobj, info)) |
| 327 | return FALSE; |
| 328 | |
| 329 | htab = elf32_arm_hash_table (info); |
| 330 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 331 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 332 | if (!htab->sgot || !htab->sgotplt) |
| 333 | abort (); |
| 334 | |
| 335 | htab->srelgot = bfd_make_section (dynobj, ".rel.got"); |
| 336 | if (htab->srelgot == NULL |
| 337 | || ! bfd_set_section_flags (dynobj, htab->srelgot, |
| 338 | (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS |
| 339 | | SEC_IN_MEMORY | SEC_LINKER_CREATED |
| 340 | | SEC_READONLY)) |
| 341 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) |
| 342 | return FALSE; |
| 343 | return TRUE; |
| 344 | } |
| 345 | |
| 346 | /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and |
| 347 | .rel.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 348 | hash table. */ |
| 349 | |
| 350 | static bfd_boolean |
| 351 | elf32_arm_create_dynamic_sections (dynobj, info) |
| 352 | bfd *dynobj; |
| 353 | struct bfd_link_info *info; |
| 354 | { |
| 355 | struct elf32_arm_link_hash_table *htab; |
| 356 | |
| 357 | htab = elf32_arm_hash_table (info); |
| 358 | if (!htab->sgot && !create_got_section (dynobj, info)) |
| 359 | return FALSE; |
| 360 | |
| 361 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 362 | return FALSE; |
| 363 | |
| 364 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 365 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); |
| 366 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 367 | if (!info->shared) |
| 368 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); |
| 369 | |
| 370 | if (!htab->splt || !htab->srelplt || !htab->sdynbss |
| 371 | || (!info->shared && !htab->srelbss)) |
| 372 | abort (); |
| 373 | |
| 374 | return TRUE; |
| 375 | } |
| 376 | |
| 377 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 378 | |
| 379 | static void |
| 380 | elf32_arm_copy_indirect_symbol (const struct elf_backend_data *bed, |
| 381 | struct elf_link_hash_entry *dir, |
| 382 | struct elf_link_hash_entry *ind) |
| 383 | { |
| 384 | struct elf32_arm_link_hash_entry *edir, *eind; |
| 385 | |
| 386 | edir = (struct elf32_arm_link_hash_entry *) dir; |
| 387 | eind = (struct elf32_arm_link_hash_entry *) ind; |
| 388 | |
| 389 | if (eind->relocs_copied != NULL) |
| 390 | { |
| 391 | if (edir->relocs_copied != NULL) |
| 392 | { |
| 393 | struct elf32_arm_relocs_copied **pp; |
| 394 | struct elf32_arm_relocs_copied *p; |
| 395 | |
| 396 | if (ind->root.type == bfd_link_hash_indirect) |
| 397 | abort (); |
| 398 | |
| 399 | /* Add reloc counts against the weak sym to the strong sym |
| 400 | list. Merge any entries against the same section. */ |
| 401 | for (pp = &eind->relocs_copied; (p = *pp) != NULL; ) |
| 402 | { |
| 403 | struct elf32_arm_relocs_copied *q; |
| 404 | |
| 405 | for (q = edir->relocs_copied; q != NULL; q = q->next) |
| 406 | if (q->section == p->section) |
| 407 | { |
| 408 | q->count += p->count; |
| 409 | *pp = p->next; |
| 410 | break; |
| 411 | } |
| 412 | if (q == NULL) |
| 413 | pp = &p->next; |
| 414 | } |
| 415 | *pp = edir->relocs_copied; |
| 416 | } |
| 417 | |
| 418 | edir->relocs_copied = eind->relocs_copied; |
| 419 | eind->relocs_copied = NULL; |
| 420 | } |
| 421 | |
| 422 | _bfd_elf_link_hash_copy_indirect (bed, dir, ind); |
| 423 | } |
| 424 | |
| 425 | /* Create an ARM elf linker hash table. */ |
| 426 | |
| 427 | static struct bfd_link_hash_table * |
| 428 | elf32_arm_link_hash_table_create (abfd) |
| 429 | bfd *abfd; |
| 430 | { |
| 431 | struct elf32_arm_link_hash_table *ret; |
| 432 | bfd_size_type amt = sizeof (struct elf32_arm_link_hash_table); |
| 433 | |
| 434 | ret = (struct elf32_arm_link_hash_table *) bfd_malloc (amt); |
| 435 | if (ret == (struct elf32_arm_link_hash_table *) NULL) |
| 436 | return NULL; |
| 437 | |
| 438 | if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, |
| 439 | elf32_arm_link_hash_newfunc)) |
| 440 | { |
| 441 | free (ret); |
| 442 | return NULL; |
| 443 | } |
| 444 | |
| 445 | ret->sgot = NULL; |
| 446 | ret->sgotplt = NULL; |
| 447 | ret->srelgot = NULL; |
| 448 | ret->splt = NULL; |
| 449 | ret->srelplt = NULL; |
| 450 | ret->sdynbss = NULL; |
| 451 | ret->srelbss = NULL; |
| 452 | ret->thumb_glue_size = 0; |
| 453 | ret->arm_glue_size = 0; |
| 454 | ret->bfd_of_glue_owner = NULL; |
| 455 | ret->no_pipeline_knowledge = 0; |
| 456 | ret->byteswap_code = 0; |
| 457 | ret->sym_sec.abfd = NULL; |
| 458 | |
| 459 | return &ret->root.root; |
| 460 | } |
| 461 | |
| 462 | /* Locate the Thumb encoded calling stub for NAME. */ |
| 463 | |
| 464 | static struct elf_link_hash_entry * |
| 465 | find_thumb_glue (link_info, name, input_bfd) |
| 466 | struct bfd_link_info *link_info; |
| 467 | const char *name; |
| 468 | bfd *input_bfd; |
| 469 | { |
| 470 | char *tmp_name; |
| 471 | struct elf_link_hash_entry *hash; |
| 472 | struct elf32_arm_link_hash_table *hash_table; |
| 473 | |
| 474 | /* We need a pointer to the armelf specific hash table. */ |
| 475 | hash_table = elf32_arm_hash_table (link_info); |
| 476 | |
| 477 | tmp_name = (char *) bfd_malloc ((bfd_size_type) strlen (name) |
| 478 | + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); |
| 479 | |
| 480 | BFD_ASSERT (tmp_name); |
| 481 | |
| 482 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); |
| 483 | |
| 484 | hash = elf_link_hash_lookup |
| 485 | (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); |
| 486 | |
| 487 | if (hash == NULL) |
| 488 | /* xgettext:c-format */ |
| 489 | (*_bfd_error_handler) (_("%s: unable to find THUMB glue '%s' for `%s'"), |
| 490 | bfd_archive_filename (input_bfd), tmp_name, name); |
| 491 | |
| 492 | free (tmp_name); |
| 493 | |
| 494 | return hash; |
| 495 | } |
| 496 | |
| 497 | /* Locate the ARM encoded calling stub for NAME. */ |
| 498 | |
| 499 | static struct elf_link_hash_entry * |
| 500 | find_arm_glue (link_info, name, input_bfd) |
| 501 | struct bfd_link_info *link_info; |
| 502 | const char *name; |
| 503 | bfd *input_bfd; |
| 504 | { |
| 505 | char *tmp_name; |
| 506 | struct elf_link_hash_entry *myh; |
| 507 | struct elf32_arm_link_hash_table *hash_table; |
| 508 | |
| 509 | /* We need a pointer to the elfarm specific hash table. */ |
| 510 | hash_table = elf32_arm_hash_table (link_info); |
| 511 | |
| 512 | tmp_name = (char *) bfd_malloc ((bfd_size_type) strlen (name) |
| 513 | + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1); |
| 514 | |
| 515 | BFD_ASSERT (tmp_name); |
| 516 | |
| 517 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); |
| 518 | |
| 519 | myh = elf_link_hash_lookup |
| 520 | (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); |
| 521 | |
| 522 | if (myh == NULL) |
| 523 | /* xgettext:c-format */ |
| 524 | (*_bfd_error_handler) (_("%s: unable to find ARM glue '%s' for `%s'"), |
| 525 | bfd_archive_filename (input_bfd), tmp_name, name); |
| 526 | |
| 527 | free (tmp_name); |
| 528 | |
| 529 | return myh; |
| 530 | } |
| 531 | |
| 532 | /* ARM->Thumb glue: |
| 533 | |
| 534 | .arm |
| 535 | __func_from_arm: |
| 536 | ldr r12, __func_addr |
| 537 | bx r12 |
| 538 | __func_addr: |
| 539 | .word func @ behave as if you saw a ARM_32 reloc. */ |
| 540 | |
| 541 | #define ARM2THUMB_GLUE_SIZE 12 |
| 542 | static const insn32 a2t1_ldr_insn = 0xe59fc000; |
| 543 | static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; |
| 544 | static const insn32 a2t3_func_addr_insn = 0x00000001; |
| 545 | |
| 546 | /* Thumb->ARM: Thumb->(non-interworking aware) ARM |
| 547 | |
| 548 | .thumb .thumb |
| 549 | .align 2 .align 2 |
| 550 | __func_from_thumb: __func_from_thumb: |
| 551 | bx pc push {r6, lr} |
| 552 | nop ldr r6, __func_addr |
| 553 | .arm mov lr, pc |
| 554 | __func_change_to_arm: bx r6 |
| 555 | b func .arm |
| 556 | __func_back_to_thumb: |
| 557 | ldmia r13! {r6, lr} |
| 558 | bx lr |
| 559 | __func_addr: |
| 560 | .word func */ |
| 561 | |
| 562 | #define THUMB2ARM_GLUE_SIZE 8 |
| 563 | static const insn16 t2a1_bx_pc_insn = 0x4778; |
| 564 | static const insn16 t2a2_noop_insn = 0x46c0; |
| 565 | static const insn32 t2a3_b_insn = 0xea000000; |
| 566 | |
| 567 | #ifndef ELFARM_NABI_C_INCLUDED |
| 568 | bfd_boolean |
| 569 | bfd_elf32_arm_allocate_interworking_sections (info) |
| 570 | struct bfd_link_info * info; |
| 571 | { |
| 572 | asection * s; |
| 573 | bfd_byte * foo; |
| 574 | struct elf32_arm_link_hash_table * globals; |
| 575 | |
| 576 | globals = elf32_arm_hash_table (info); |
| 577 | |
| 578 | BFD_ASSERT (globals != NULL); |
| 579 | |
| 580 | if (globals->arm_glue_size != 0) |
| 581 | { |
| 582 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 583 | |
| 584 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, |
| 585 | ARM2THUMB_GLUE_SECTION_NAME); |
| 586 | |
| 587 | BFD_ASSERT (s != NULL); |
| 588 | |
| 589 | foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner, |
| 590 | globals->arm_glue_size); |
| 591 | |
| 592 | s->_raw_size = s->_cooked_size = globals->arm_glue_size; |
| 593 | s->contents = foo; |
| 594 | } |
| 595 | |
| 596 | if (globals->thumb_glue_size != 0) |
| 597 | { |
| 598 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 599 | |
| 600 | s = bfd_get_section_by_name |
| 601 | (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); |
| 602 | |
| 603 | BFD_ASSERT (s != NULL); |
| 604 | |
| 605 | foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner, |
| 606 | globals->thumb_glue_size); |
| 607 | |
| 608 | s->_raw_size = s->_cooked_size = globals->thumb_glue_size; |
| 609 | s->contents = foo; |
| 610 | } |
| 611 | |
| 612 | return TRUE; |
| 613 | } |
| 614 | |
| 615 | static void |
| 616 | record_arm_to_thumb_glue (link_info, h) |
| 617 | struct bfd_link_info * link_info; |
| 618 | struct elf_link_hash_entry * h; |
| 619 | { |
| 620 | const char * name = h->root.root.string; |
| 621 | asection * s; |
| 622 | char * tmp_name; |
| 623 | struct elf_link_hash_entry * myh; |
| 624 | struct bfd_link_hash_entry * bh; |
| 625 | struct elf32_arm_link_hash_table * globals; |
| 626 | bfd_vma val; |
| 627 | |
| 628 | globals = elf32_arm_hash_table (link_info); |
| 629 | |
| 630 | BFD_ASSERT (globals != NULL); |
| 631 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 632 | |
| 633 | s = bfd_get_section_by_name |
| 634 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); |
| 635 | |
| 636 | BFD_ASSERT (s != NULL); |
| 637 | |
| 638 | tmp_name = (char *) bfd_malloc ((bfd_size_type) strlen (name) |
| 639 | + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1); |
| 640 | |
| 641 | BFD_ASSERT (tmp_name); |
| 642 | |
| 643 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); |
| 644 | |
| 645 | myh = elf_link_hash_lookup |
| 646 | (&(globals)->root, tmp_name, FALSE, FALSE, TRUE); |
| 647 | |
| 648 | if (myh != NULL) |
| 649 | { |
| 650 | /* We've already seen this guy. */ |
| 651 | free (tmp_name); |
| 652 | return; |
| 653 | } |
| 654 | |
| 655 | /* The only trick here is using hash_table->arm_glue_size as the value. Even |
| 656 | though the section isn't allocated yet, this is where we will be putting |
| 657 | it. */ |
| 658 | bh = NULL; |
| 659 | val = globals->arm_glue_size + 1; |
| 660 | _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner, |
| 661 | tmp_name, BSF_GLOBAL, s, val, |
| 662 | NULL, TRUE, FALSE, &bh); |
| 663 | |
| 664 | free (tmp_name); |
| 665 | |
| 666 | globals->arm_glue_size += ARM2THUMB_GLUE_SIZE; |
| 667 | |
| 668 | return; |
| 669 | } |
| 670 | |
| 671 | static void |
| 672 | record_thumb_to_arm_glue (link_info, h) |
| 673 | struct bfd_link_info *link_info; |
| 674 | struct elf_link_hash_entry *h; |
| 675 | { |
| 676 | const char *name = h->root.root.string; |
| 677 | asection *s; |
| 678 | char *tmp_name; |
| 679 | struct elf_link_hash_entry *myh; |
| 680 | struct bfd_link_hash_entry *bh; |
| 681 | struct elf32_arm_link_hash_table *hash_table; |
| 682 | char bind; |
| 683 | bfd_vma val; |
| 684 | |
| 685 | hash_table = elf32_arm_hash_table (link_info); |
| 686 | |
| 687 | BFD_ASSERT (hash_table != NULL); |
| 688 | BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL); |
| 689 | |
| 690 | s = bfd_get_section_by_name |
| 691 | (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); |
| 692 | |
| 693 | BFD_ASSERT (s != NULL); |
| 694 | |
| 695 | tmp_name = (char *) bfd_malloc ((bfd_size_type) strlen (name) |
| 696 | + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); |
| 697 | |
| 698 | BFD_ASSERT (tmp_name); |
| 699 | |
| 700 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); |
| 701 | |
| 702 | myh = elf_link_hash_lookup |
| 703 | (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); |
| 704 | |
| 705 | if (myh != NULL) |
| 706 | { |
| 707 | /* We've already seen this guy. */ |
| 708 | free (tmp_name); |
| 709 | return; |
| 710 | } |
| 711 | |
| 712 | bh = NULL; |
| 713 | val = hash_table->thumb_glue_size + 1; |
| 714 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, |
| 715 | tmp_name, BSF_GLOBAL, s, val, |
| 716 | NULL, TRUE, FALSE, &bh); |
| 717 | |
| 718 | /* If we mark it 'Thumb', the disassembler will do a better job. */ |
| 719 | myh = (struct elf_link_hash_entry *) bh; |
| 720 | bind = ELF_ST_BIND (myh->type); |
| 721 | myh->type = ELF_ST_INFO (bind, STT_ARM_TFUNC); |
| 722 | |
| 723 | free (tmp_name); |
| 724 | |
| 725 | #define CHANGE_TO_ARM "__%s_change_to_arm" |
| 726 | #define BACK_FROM_ARM "__%s_back_from_arm" |
| 727 | |
| 728 | /* Allocate another symbol to mark where we switch to Arm mode. */ |
| 729 | tmp_name = (char *) bfd_malloc ((bfd_size_type) strlen (name) |
| 730 | + strlen (CHANGE_TO_ARM) + 1); |
| 731 | |
| 732 | BFD_ASSERT (tmp_name); |
| 733 | |
| 734 | sprintf (tmp_name, CHANGE_TO_ARM, name); |
| 735 | |
| 736 | bh = NULL; |
| 737 | val = hash_table->thumb_glue_size + 4, |
| 738 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, |
| 739 | tmp_name, BSF_LOCAL, s, val, |
| 740 | NULL, TRUE, FALSE, &bh); |
| 741 | |
| 742 | free (tmp_name); |
| 743 | |
| 744 | hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE; |
| 745 | |
| 746 | return; |
| 747 | } |
| 748 | |
| 749 | /* Add the glue sections to ABFD. This function is called from the |
| 750 | linker scripts in ld/emultempl/{armelf}.em. */ |
| 751 | |
| 752 | bfd_boolean |
| 753 | bfd_elf32_arm_add_glue_sections_to_bfd (abfd, info) |
| 754 | bfd *abfd; |
| 755 | struct bfd_link_info *info; |
| 756 | { |
| 757 | flagword flags; |
| 758 | asection *sec; |
| 759 | |
| 760 | /* If we are only performing a partial |
| 761 | link do not bother adding the glue. */ |
| 762 | if (info->relocatable) |
| 763 | return TRUE; |
| 764 | |
| 765 | sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); |
| 766 | |
| 767 | if (sec == NULL) |
| 768 | { |
| 769 | /* Note: we do not include the flag SEC_LINKER_CREATED, as this |
| 770 | will prevent elf_link_input_bfd() from processing the contents |
| 771 | of this section. */ |
| 772 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; |
| 773 | |
| 774 | sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME); |
| 775 | |
| 776 | if (sec == NULL |
| 777 | || !bfd_set_section_flags (abfd, sec, flags) |
| 778 | || !bfd_set_section_alignment (abfd, sec, 2)) |
| 779 | return FALSE; |
| 780 | |
| 781 | /* Set the gc mark to prevent the section from being removed by garbage |
| 782 | collection, despite the fact that no relocs refer to this section. */ |
| 783 | sec->gc_mark = 1; |
| 784 | } |
| 785 | |
| 786 | sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME); |
| 787 | |
| 788 | if (sec == NULL) |
| 789 | { |
| 790 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; |
| 791 | |
| 792 | sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME); |
| 793 | |
| 794 | if (sec == NULL |
| 795 | || !bfd_set_section_flags (abfd, sec, flags) |
| 796 | || !bfd_set_section_alignment (abfd, sec, 2)) |
| 797 | return FALSE; |
| 798 | |
| 799 | sec->gc_mark = 1; |
| 800 | } |
| 801 | |
| 802 | return TRUE; |
| 803 | } |
| 804 | |
| 805 | /* Select a BFD to be used to hold the sections used by the glue code. |
| 806 | This function is called from the linker scripts in ld/emultempl/ |
| 807 | {armelf/pe}.em */ |
| 808 | |
| 809 | bfd_boolean |
| 810 | bfd_elf32_arm_get_bfd_for_interworking (abfd, info) |
| 811 | bfd *abfd; |
| 812 | struct bfd_link_info *info; |
| 813 | { |
| 814 | struct elf32_arm_link_hash_table *globals; |
| 815 | |
| 816 | /* If we are only performing a partial link |
| 817 | do not bother getting a bfd to hold the glue. */ |
| 818 | if (info->relocatable) |
| 819 | return TRUE; |
| 820 | |
| 821 | globals = elf32_arm_hash_table (info); |
| 822 | |
| 823 | BFD_ASSERT (globals != NULL); |
| 824 | |
| 825 | if (globals->bfd_of_glue_owner != NULL) |
| 826 | return TRUE; |
| 827 | |
| 828 | /* Save the bfd for later use. */ |
| 829 | globals->bfd_of_glue_owner = abfd; |
| 830 | |
| 831 | return TRUE; |
| 832 | } |
| 833 | |
| 834 | bfd_boolean |
| 835 | bfd_elf32_arm_process_before_allocation (abfd, link_info, |
| 836 | no_pipeline_knowledge, |
| 837 | byteswap_code) |
| 838 | bfd *abfd; |
| 839 | struct bfd_link_info *link_info; |
| 840 | int no_pipeline_knowledge; |
| 841 | int byteswap_code; |
| 842 | { |
| 843 | Elf_Internal_Shdr *symtab_hdr; |
| 844 | Elf_Internal_Rela *internal_relocs = NULL; |
| 845 | Elf_Internal_Rela *irel, *irelend; |
| 846 | bfd_byte *contents = NULL; |
| 847 | |
| 848 | asection *sec; |
| 849 | struct elf32_arm_link_hash_table *globals; |
| 850 | |
| 851 | /* If we are only performing a partial link do not bother |
| 852 | to construct any glue. */ |
| 853 | if (link_info->relocatable) |
| 854 | return TRUE; |
| 855 | |
| 856 | /* Here we have a bfd that is to be included on the link. We have a hook |
| 857 | to do reloc rummaging, before section sizes are nailed down. */ |
| 858 | globals = elf32_arm_hash_table (link_info); |
| 859 | |
| 860 | BFD_ASSERT (globals != NULL); |
| 861 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 862 | |
| 863 | globals->no_pipeline_knowledge = no_pipeline_knowledge; |
| 864 | if (byteswap_code && !bfd_big_endian (abfd)) |
| 865 | { |
| 866 | _bfd_error_handler ( |
| 867 | _("%s: BE8 images only valid in big-endian mode."), |
| 868 | bfd_archive_filename (abfd)); |
| 869 | return FALSE; |
| 870 | } |
| 871 | globals->byteswap_code = byteswap_code; |
| 872 | |
| 873 | /* Rummage around all the relocs and map the glue vectors. */ |
| 874 | sec = abfd->sections; |
| 875 | |
| 876 | if (sec == NULL) |
| 877 | return TRUE; |
| 878 | |
| 879 | for (; sec != NULL; sec = sec->next) |
| 880 | { |
| 881 | if (sec->reloc_count == 0) |
| 882 | continue; |
| 883 | |
| 884 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 885 | |
| 886 | /* Load the relocs. */ |
| 887 | internal_relocs |
| 888 | = _bfd_elf_link_read_relocs (abfd, sec, (PTR) NULL, |
| 889 | (Elf_Internal_Rela *) NULL, FALSE); |
| 890 | |
| 891 | if (internal_relocs == NULL) |
| 892 | goto error_return; |
| 893 | |
| 894 | irelend = internal_relocs + sec->reloc_count; |
| 895 | for (irel = internal_relocs; irel < irelend; irel++) |
| 896 | { |
| 897 | long r_type; |
| 898 | unsigned long r_index; |
| 899 | |
| 900 | struct elf_link_hash_entry *h; |
| 901 | |
| 902 | r_type = ELF32_R_TYPE (irel->r_info); |
| 903 | r_index = ELF32_R_SYM (irel->r_info); |
| 904 | |
| 905 | /* These are the only relocation types we care about. */ |
| 906 | if ( r_type != R_ARM_PC24 |
| 907 | && r_type != R_ARM_THM_PC22) |
| 908 | continue; |
| 909 | |
| 910 | /* Get the section contents if we haven't done so already. */ |
| 911 | if (contents == NULL) |
| 912 | { |
| 913 | /* Get cached copy if it exists. */ |
| 914 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 915 | contents = elf_section_data (sec)->this_hdr.contents; |
| 916 | else |
| 917 | { |
| 918 | /* Go get them off disk. */ |
| 919 | contents = (bfd_byte *) bfd_malloc (sec->_raw_size); |
| 920 | if (contents == NULL) |
| 921 | goto error_return; |
| 922 | |
| 923 | if (!bfd_get_section_contents (abfd, sec, contents, |
| 924 | (file_ptr) 0, sec->_raw_size)) |
| 925 | goto error_return; |
| 926 | } |
| 927 | } |
| 928 | |
| 929 | /* If the relocation is not against a symbol it cannot concern us. */ |
| 930 | h = NULL; |
| 931 | |
| 932 | /* We don't care about local symbols. */ |
| 933 | if (r_index < symtab_hdr->sh_info) |
| 934 | continue; |
| 935 | |
| 936 | /* This is an external symbol. */ |
| 937 | r_index -= symtab_hdr->sh_info; |
| 938 | h = (struct elf_link_hash_entry *) |
| 939 | elf_sym_hashes (abfd)[r_index]; |
| 940 | |
| 941 | /* If the relocation is against a static symbol it must be within |
| 942 | the current section and so cannot be a cross ARM/Thumb relocation. */ |
| 943 | if (h == NULL) |
| 944 | continue; |
| 945 | |
| 946 | switch (r_type) |
| 947 | { |
| 948 | case R_ARM_PC24: |
| 949 | /* This one is a call from arm code. We need to look up |
| 950 | the target of the call. If it is a thumb target, we |
| 951 | insert glue. */ |
| 952 | if (ELF_ST_TYPE(h->type) == STT_ARM_TFUNC) |
| 953 | record_arm_to_thumb_glue (link_info, h); |
| 954 | break; |
| 955 | |
| 956 | case R_ARM_THM_PC22: |
| 957 | /* This one is a call from thumb code. We look |
| 958 | up the target of the call. If it is not a thumb |
| 959 | target, we insert glue. */ |
| 960 | if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC) |
| 961 | record_thumb_to_arm_glue (link_info, h); |
| 962 | break; |
| 963 | |
| 964 | default: |
| 965 | break; |
| 966 | } |
| 967 | } |
| 968 | |
| 969 | if (contents != NULL |
| 970 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 971 | free (contents); |
| 972 | contents = NULL; |
| 973 | |
| 974 | if (internal_relocs != NULL |
| 975 | && elf_section_data (sec)->relocs != internal_relocs) |
| 976 | free (internal_relocs); |
| 977 | internal_relocs = NULL; |
| 978 | } |
| 979 | |
| 980 | return TRUE; |
| 981 | |
| 982 | error_return: |
| 983 | if (contents != NULL |
| 984 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 985 | free (contents); |
| 986 | if (internal_relocs != NULL |
| 987 | && elf_section_data (sec)->relocs != internal_relocs) |
| 988 | free (internal_relocs); |
| 989 | |
| 990 | return FALSE; |
| 991 | } |
| 992 | #endif |
| 993 | |
| 994 | /* The thumb form of a long branch is a bit finicky, because the offset |
| 995 | encoding is split over two fields, each in it's own instruction. They |
| 996 | can occur in any order. So given a thumb form of long branch, and an |
| 997 | offset, insert the offset into the thumb branch and return finished |
| 998 | instruction. |
| 999 | |
| 1000 | It takes two thumb instructions to encode the target address. Each has |
| 1001 | 11 bits to invest. The upper 11 bits are stored in one (identified by |
| 1002 | H-0.. see below), the lower 11 bits are stored in the other (identified |
| 1003 | by H-1). |
| 1004 | |
| 1005 | Combine together and shifted left by 1 (it's a half word address) and |
| 1006 | there you have it. |
| 1007 | |
| 1008 | Op: 1111 = F, |
| 1009 | H-0, upper address-0 = 000 |
| 1010 | Op: 1111 = F, |
| 1011 | H-1, lower address-0 = 800 |
| 1012 | |
| 1013 | They can be ordered either way, but the arm tools I've seen always put |
| 1014 | the lower one first. It probably doesn't matter. krk@cygnus.com |
| 1015 | |
| 1016 | XXX: Actually the order does matter. The second instruction (H-1) |
| 1017 | moves the computed address into the PC, so it must be the second one |
| 1018 | in the sequence. The problem, however is that whilst little endian code |
| 1019 | stores the instructions in HI then LOW order, big endian code does the |
| 1020 | reverse. nickc@cygnus.com. */ |
| 1021 | |
| 1022 | #define LOW_HI_ORDER 0xF800F000 |
| 1023 | #define HI_LOW_ORDER 0xF000F800 |
| 1024 | |
| 1025 | static insn32 |
| 1026 | insert_thumb_branch (br_insn, rel_off) |
| 1027 | insn32 br_insn; |
| 1028 | int rel_off; |
| 1029 | { |
| 1030 | unsigned int low_bits; |
| 1031 | unsigned int high_bits; |
| 1032 | |
| 1033 | BFD_ASSERT ((rel_off & 1) != 1); |
| 1034 | |
| 1035 | rel_off >>= 1; /* Half word aligned address. */ |
| 1036 | low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */ |
| 1037 | high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */ |
| 1038 | |
| 1039 | if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER) |
| 1040 | br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits; |
| 1041 | else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER) |
| 1042 | br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits; |
| 1043 | else |
| 1044 | /* FIXME: abort is probably not the right call. krk@cygnus.com */ |
| 1045 | abort (); /* error - not a valid branch instruction form. */ |
| 1046 | |
| 1047 | return br_insn; |
| 1048 | } |
| 1049 | |
| 1050 | /* Thumb code calling an ARM function. */ |
| 1051 | |
| 1052 | static int |
| 1053 | elf32_thumb_to_arm_stub (info, name, input_bfd, output_bfd, input_section, |
| 1054 | hit_data, sym_sec, offset, addend, val) |
| 1055 | struct bfd_link_info * info; |
| 1056 | const char * name; |
| 1057 | bfd * input_bfd; |
| 1058 | bfd * output_bfd; |
| 1059 | asection * input_section; |
| 1060 | bfd_byte * hit_data; |
| 1061 | asection * sym_sec; |
| 1062 | bfd_vma offset; |
| 1063 | bfd_signed_vma addend; |
| 1064 | bfd_vma val; |
| 1065 | { |
| 1066 | asection * s = 0; |
| 1067 | bfd_vma my_offset; |
| 1068 | unsigned long int tmp; |
| 1069 | long int ret_offset; |
| 1070 | struct elf_link_hash_entry * myh; |
| 1071 | struct elf32_arm_link_hash_table * globals; |
| 1072 | |
| 1073 | myh = find_thumb_glue (info, name, input_bfd); |
| 1074 | if (myh == NULL) |
| 1075 | return FALSE; |
| 1076 | |
| 1077 | globals = elf32_arm_hash_table (info); |
| 1078 | |
| 1079 | BFD_ASSERT (globals != NULL); |
| 1080 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1081 | |
| 1082 | my_offset = myh->root.u.def.value; |
| 1083 | |
| 1084 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, |
| 1085 | THUMB2ARM_GLUE_SECTION_NAME); |
| 1086 | |
| 1087 | BFD_ASSERT (s != NULL); |
| 1088 | BFD_ASSERT (s->contents != NULL); |
| 1089 | BFD_ASSERT (s->output_section != NULL); |
| 1090 | |
| 1091 | if ((my_offset & 0x01) == 0x01) |
| 1092 | { |
| 1093 | if (sym_sec != NULL |
| 1094 | && sym_sec->owner != NULL |
| 1095 | && !INTERWORK_FLAG (sym_sec->owner)) |
| 1096 | { |
| 1097 | (*_bfd_error_handler) |
| 1098 | (_("%s(%s): warning: interworking not enabled."), |
| 1099 | bfd_archive_filename (sym_sec->owner), name); |
| 1100 | (*_bfd_error_handler) |
| 1101 | (_(" first occurrence: %s: thumb call to arm"), |
| 1102 | bfd_archive_filename (input_bfd)); |
| 1103 | |
| 1104 | return FALSE; |
| 1105 | } |
| 1106 | |
| 1107 | --my_offset; |
| 1108 | myh->root.u.def.value = my_offset; |
| 1109 | |
| 1110 | bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn, |
| 1111 | s->contents + my_offset); |
| 1112 | |
| 1113 | bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn, |
| 1114 | s->contents + my_offset + 2); |
| 1115 | |
| 1116 | ret_offset = |
| 1117 | /* Address of destination of the stub. */ |
| 1118 | ((bfd_signed_vma) val) |
| 1119 | - ((bfd_signed_vma) |
| 1120 | /* Offset from the start of the current section to the start of the stubs. */ |
| 1121 | (s->output_offset |
| 1122 | /* Offset of the start of this stub from the start of the stubs. */ |
| 1123 | + my_offset |
| 1124 | /* Address of the start of the current section. */ |
| 1125 | + s->output_section->vma) |
| 1126 | /* The branch instruction is 4 bytes into the stub. */ |
| 1127 | + 4 |
| 1128 | /* ARM branches work from the pc of the instruction + 8. */ |
| 1129 | + 8); |
| 1130 | |
| 1131 | bfd_put_32 (output_bfd, |
| 1132 | (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), |
| 1133 | s->contents + my_offset + 4); |
| 1134 | } |
| 1135 | |
| 1136 | BFD_ASSERT (my_offset <= globals->thumb_glue_size); |
| 1137 | |
| 1138 | /* Now go back and fix up the original BL insn to point to here. */ |
| 1139 | ret_offset = |
| 1140 | /* Address of where the stub is located. */ |
| 1141 | (s->output_section->vma + s->output_offset + my_offset) |
| 1142 | /* Address of where the BL is located. */ |
| 1143 | - (input_section->output_section->vma + input_section->output_offset + offset) |
| 1144 | /* Addend in the relocation. */ |
| 1145 | - addend |
| 1146 | /* Biassing for PC-relative addressing. */ |
| 1147 | - 8; |
| 1148 | |
| 1149 | tmp = bfd_get_32 (input_bfd, hit_data |
| 1150 | - input_section->vma); |
| 1151 | |
| 1152 | bfd_put_32 (output_bfd, |
| 1153 | (bfd_vma) insert_thumb_branch (tmp, ret_offset), |
| 1154 | hit_data - input_section->vma); |
| 1155 | |
| 1156 | return TRUE; |
| 1157 | } |
| 1158 | |
| 1159 | /* Arm code calling a Thumb function. */ |
| 1160 | |
| 1161 | static int |
| 1162 | elf32_arm_to_thumb_stub (info, name, input_bfd, output_bfd, input_section, |
| 1163 | hit_data, sym_sec, offset, addend, val) |
| 1164 | struct bfd_link_info * info; |
| 1165 | const char * name; |
| 1166 | bfd * input_bfd; |
| 1167 | bfd * output_bfd; |
| 1168 | asection * input_section; |
| 1169 | bfd_byte * hit_data; |
| 1170 | asection * sym_sec; |
| 1171 | bfd_vma offset; |
| 1172 | bfd_signed_vma addend; |
| 1173 | bfd_vma val; |
| 1174 | { |
| 1175 | unsigned long int tmp; |
| 1176 | bfd_vma my_offset; |
| 1177 | asection * s; |
| 1178 | long int ret_offset; |
| 1179 | struct elf_link_hash_entry * myh; |
| 1180 | struct elf32_arm_link_hash_table * globals; |
| 1181 | |
| 1182 | myh = find_arm_glue (info, name, input_bfd); |
| 1183 | if (myh == NULL) |
| 1184 | return FALSE; |
| 1185 | |
| 1186 | globals = elf32_arm_hash_table (info); |
| 1187 | |
| 1188 | BFD_ASSERT (globals != NULL); |
| 1189 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 1190 | |
| 1191 | my_offset = myh->root.u.def.value; |
| 1192 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, |
| 1193 | ARM2THUMB_GLUE_SECTION_NAME); |
| 1194 | BFD_ASSERT (s != NULL); |
| 1195 | BFD_ASSERT (s->contents != NULL); |
| 1196 | BFD_ASSERT (s->output_section != NULL); |
| 1197 | |
| 1198 | if ((my_offset & 0x01) == 0x01) |
| 1199 | { |
| 1200 | if (sym_sec != NULL |
| 1201 | && sym_sec->owner != NULL |
| 1202 | && !INTERWORK_FLAG (sym_sec->owner)) |
| 1203 | { |
| 1204 | (*_bfd_error_handler) |
| 1205 | (_("%s(%s): warning: interworking not enabled."), |
| 1206 | bfd_archive_filename (sym_sec->owner), name); |
| 1207 | (*_bfd_error_handler) |
| 1208 | (_(" first occurrence: %s: arm call to thumb"), |
| 1209 | bfd_archive_filename (input_bfd)); |
| 1210 | } |
| 1211 | |
| 1212 | --my_offset; |
| 1213 | myh->root.u.def.value = my_offset; |
| 1214 | |
| 1215 | bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn, |
| 1216 | s->contents + my_offset); |
| 1217 | |
| 1218 | bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn, |
| 1219 | s->contents + my_offset + 4); |
| 1220 | |
| 1221 | /* It's a thumb address. Add the low order bit. */ |
| 1222 | bfd_put_32 (output_bfd, val | a2t3_func_addr_insn, |
| 1223 | s->contents + my_offset + 8); |
| 1224 | } |
| 1225 | |
| 1226 | BFD_ASSERT (my_offset <= globals->arm_glue_size); |
| 1227 | |
| 1228 | tmp = bfd_get_32 (input_bfd, hit_data); |
| 1229 | tmp = tmp & 0xFF000000; |
| 1230 | |
| 1231 | /* Somehow these are both 4 too far, so subtract 8. */ |
| 1232 | ret_offset = (s->output_offset |
| 1233 | + my_offset |
| 1234 | + s->output_section->vma |
| 1235 | - (input_section->output_offset |
| 1236 | + input_section->output_section->vma |
| 1237 | + offset + addend) |
| 1238 | - 8); |
| 1239 | |
| 1240 | tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); |
| 1241 | |
| 1242 | bfd_put_32 (output_bfd, (bfd_vma) tmp, hit_data - input_section->vma); |
| 1243 | |
| 1244 | return TRUE; |
| 1245 | } |
| 1246 | |
| 1247 | /* Perform a relocation as part of a final link. */ |
| 1248 | |
| 1249 | static bfd_reloc_status_type |
| 1250 | elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, |
| 1251 | input_section, contents, rel, value, |
| 1252 | info, sym_sec, sym_name, sym_flags, h) |
| 1253 | reloc_howto_type * howto; |
| 1254 | bfd * input_bfd; |
| 1255 | bfd * output_bfd; |
| 1256 | asection * input_section; |
| 1257 | bfd_byte * contents; |
| 1258 | Elf_Internal_Rela * rel; |
| 1259 | bfd_vma value; |
| 1260 | struct bfd_link_info * info; |
| 1261 | asection * sym_sec; |
| 1262 | const char * sym_name; |
| 1263 | int sym_flags; |
| 1264 | struct elf_link_hash_entry * h; |
| 1265 | { |
| 1266 | unsigned long r_type = howto->type; |
| 1267 | unsigned long r_symndx; |
| 1268 | bfd_byte * hit_data = contents + rel->r_offset; |
| 1269 | bfd * dynobj = NULL; |
| 1270 | Elf_Internal_Shdr * symtab_hdr; |
| 1271 | struct elf_link_hash_entry ** sym_hashes; |
| 1272 | bfd_vma * local_got_offsets; |
| 1273 | asection * sgot = NULL; |
| 1274 | asection * splt = NULL; |
| 1275 | asection * sreloc = NULL; |
| 1276 | bfd_vma addend; |
| 1277 | bfd_signed_vma signed_addend; |
| 1278 | struct elf32_arm_link_hash_table * globals; |
| 1279 | |
| 1280 | /* If the start address has been set, then set the EF_ARM_HASENTRY |
| 1281 | flag. Setting this more than once is redundant, but the cost is |
| 1282 | not too high, and it keeps the code simple. |
| 1283 | |
| 1284 | The test is done here, rather than somewhere else, because the |
| 1285 | start address is only set just before the final link commences. |
| 1286 | |
| 1287 | Note - if the user deliberately sets a start address of 0, the |
| 1288 | flag will not be set. */ |
| 1289 | if (bfd_get_start_address (output_bfd) != 0) |
| 1290 | elf_elfheader (output_bfd)->e_flags |= EF_ARM_HASENTRY; |
| 1291 | |
| 1292 | globals = elf32_arm_hash_table (info); |
| 1293 | |
| 1294 | dynobj = elf_hash_table (info)->dynobj; |
| 1295 | if (dynobj) |
| 1296 | { |
| 1297 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 1298 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 1299 | } |
| 1300 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 1301 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1302 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 1303 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1304 | |
| 1305 | #if USE_REL |
| 1306 | addend = bfd_get_32 (input_bfd, hit_data) & howto->src_mask; |
| 1307 | |
| 1308 | if (addend & ((howto->src_mask + 1) >> 1)) |
| 1309 | { |
| 1310 | signed_addend = -1; |
| 1311 | signed_addend &= ~ howto->src_mask; |
| 1312 | signed_addend |= addend; |
| 1313 | } |
| 1314 | else |
| 1315 | signed_addend = addend; |
| 1316 | #else |
| 1317 | addend = signed_addend = rel->r_addend; |
| 1318 | #endif |
| 1319 | |
| 1320 | switch (r_type) |
| 1321 | { |
| 1322 | case R_ARM_NONE: |
| 1323 | return bfd_reloc_ok; |
| 1324 | |
| 1325 | case R_ARM_PC24: |
| 1326 | case R_ARM_ABS32: |
| 1327 | case R_ARM_REL32: |
| 1328 | #ifndef OLD_ARM_ABI |
| 1329 | case R_ARM_XPC25: |
| 1330 | #endif |
| 1331 | case R_ARM_PLT32: |
| 1332 | /* r_symndx will be zero only for relocs against symbols |
| 1333 | from removed linkonce sections, or sections discarded by |
| 1334 | a linker script. */ |
| 1335 | if (r_symndx == 0) |
| 1336 | return bfd_reloc_ok; |
| 1337 | |
| 1338 | /* Handle relocations which should use the PLT entry. ABS32/REL32 |
| 1339 | will use the symbol's value, which may point to a PLT entry, but we |
| 1340 | don't need to handle that here. If we created a PLT entry, all |
| 1341 | branches in this object should go to it. */ |
| 1342 | if ((r_type != R_ARM_ABS32 && r_type != R_ARM_REL32) |
| 1343 | && h != NULL |
| 1344 | && splt != NULL |
| 1345 | && h->plt.offset != (bfd_vma) -1) |
| 1346 | { |
| 1347 | /* If we've created a .plt section, and assigned a PLT entry to |
| 1348 | this function, it should not be known to bind locally. If |
| 1349 | it were, we would have cleared the PLT entry. */ |
| 1350 | BFD_ASSERT (!SYMBOL_CALLS_LOCAL (info, h)); |
| 1351 | |
| 1352 | value = (splt->output_section->vma |
| 1353 | + splt->output_offset |
| 1354 | + h->plt.offset); |
| 1355 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1356 | contents, rel->r_offset, value, |
| 1357 | (bfd_vma) 0); |
| 1358 | } |
| 1359 | |
| 1360 | /* When generating a shared object, these relocations are copied |
| 1361 | into the output file to be resolved at run time. */ |
| 1362 | if (info->shared |
| 1363 | && (input_section->flags & SEC_ALLOC) |
| 1364 | && (r_type != R_ARM_REL32 |
| 1365 | || !SYMBOL_CALLS_LOCAL (info, h)) |
| 1366 | && (h == NULL |
| 1367 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 1368 | || h->root.type != bfd_link_hash_undefweak) |
| 1369 | && r_type != R_ARM_PC24 |
| 1370 | && r_type != R_ARM_PLT32) |
| 1371 | { |
| 1372 | Elf_Internal_Rela outrel; |
| 1373 | bfd_byte *loc; |
| 1374 | bfd_boolean skip, relocate; |
| 1375 | |
| 1376 | if (sreloc == NULL) |
| 1377 | { |
| 1378 | const char * name; |
| 1379 | |
| 1380 | name = (bfd_elf_string_from_elf_section |
| 1381 | (input_bfd, |
| 1382 | elf_elfheader (input_bfd)->e_shstrndx, |
| 1383 | elf_section_data (input_section)->rel_hdr.sh_name)); |
| 1384 | if (name == NULL) |
| 1385 | return bfd_reloc_notsupported; |
| 1386 | |
| 1387 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 |
| 1388 | && strcmp (bfd_get_section_name (input_bfd, |
| 1389 | input_section), |
| 1390 | name + 4) == 0); |
| 1391 | |
| 1392 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 1393 | BFD_ASSERT (sreloc != NULL); |
| 1394 | } |
| 1395 | |
| 1396 | skip = FALSE; |
| 1397 | relocate = FALSE; |
| 1398 | |
| 1399 | outrel.r_offset = |
| 1400 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 1401 | rel->r_offset); |
| 1402 | if (outrel.r_offset == (bfd_vma) -1) |
| 1403 | skip = TRUE; |
| 1404 | else if (outrel.r_offset == (bfd_vma) -2) |
| 1405 | skip = TRUE, relocate = TRUE; |
| 1406 | outrel.r_offset += (input_section->output_section->vma |
| 1407 | + input_section->output_offset); |
| 1408 | |
| 1409 | if (skip) |
| 1410 | memset (&outrel, 0, sizeof outrel); |
| 1411 | else if (h != NULL |
| 1412 | && h->dynindx != -1 |
| 1413 | && (!info->shared |
| 1414 | || !info->symbolic |
| 1415 | || (h->elf_link_hash_flags |
| 1416 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 1417 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 1418 | else |
| 1419 | { |
| 1420 | /* This symbol is local, or marked to become local. */ |
| 1421 | relocate = TRUE; |
| 1422 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); |
| 1423 | } |
| 1424 | |
| 1425 | loc = sreloc->contents; |
| 1426 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 1427 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 1428 | |
| 1429 | /* If this reloc is against an external symbol, we do not want to |
| 1430 | fiddle with the addend. Otherwise, we need to include the symbol |
| 1431 | value so that it becomes an addend for the dynamic reloc. */ |
| 1432 | if (! relocate) |
| 1433 | return bfd_reloc_ok; |
| 1434 | |
| 1435 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1436 | contents, rel->r_offset, value, |
| 1437 | (bfd_vma) 0); |
| 1438 | } |
| 1439 | else switch (r_type) |
| 1440 | { |
| 1441 | #ifndef OLD_ARM_ABI |
| 1442 | case R_ARM_XPC25: /* Arm BLX instruction. */ |
| 1443 | #endif |
| 1444 | case R_ARM_PC24: /* Arm B/BL instruction */ |
| 1445 | case R_ARM_PLT32: |
| 1446 | #ifndef OLD_ARM_ABI |
| 1447 | if (r_type == R_ARM_XPC25) |
| 1448 | { |
| 1449 | /* Check for Arm calling Arm function. */ |
| 1450 | /* FIXME: Should we translate the instruction into a BL |
| 1451 | instruction instead ? */ |
| 1452 | if (sym_flags != STT_ARM_TFUNC) |
| 1453 | (*_bfd_error_handler) (_("\ |
| 1454 | %s: Warning: Arm BLX instruction targets Arm function '%s'."), |
| 1455 | bfd_archive_filename (input_bfd), |
| 1456 | h ? h->root.root.string : "(local)"); |
| 1457 | } |
| 1458 | else |
| 1459 | #endif |
| 1460 | { |
| 1461 | /* Check for Arm calling Thumb function. */ |
| 1462 | if (sym_flags == STT_ARM_TFUNC) |
| 1463 | { |
| 1464 | elf32_arm_to_thumb_stub (info, sym_name, input_bfd, output_bfd, |
| 1465 | input_section, hit_data, sym_sec, rel->r_offset, |
| 1466 | signed_addend, value); |
| 1467 | return bfd_reloc_ok; |
| 1468 | } |
| 1469 | } |
| 1470 | |
| 1471 | if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 |
| 1472 | || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0) |
| 1473 | { |
| 1474 | /* The old way of doing things. Trearing the addend as a |
| 1475 | byte sized field and adding in the pipeline offset. */ |
| 1476 | value -= (input_section->output_section->vma |
| 1477 | + input_section->output_offset); |
| 1478 | value -= rel->r_offset; |
| 1479 | value += addend; |
| 1480 | |
| 1481 | if (! globals->no_pipeline_knowledge) |
| 1482 | value -= 8; |
| 1483 | } |
| 1484 | else |
| 1485 | { |
| 1486 | /* The ARM ELF ABI says that this reloc is computed as: S - P + A |
| 1487 | where: |
| 1488 | S is the address of the symbol in the relocation. |
| 1489 | P is address of the instruction being relocated. |
| 1490 | A is the addend (extracted from the instruction) in bytes. |
| 1491 | |
| 1492 | S is held in 'value'. |
| 1493 | P is the base address of the section containing the instruction |
| 1494 | plus the offset of the reloc into that section, ie: |
| 1495 | (input_section->output_section->vma + |
| 1496 | input_section->output_offset + |
| 1497 | rel->r_offset). |
| 1498 | A is the addend, converted into bytes, ie: |
| 1499 | (signed_addend * 4) |
| 1500 | |
| 1501 | Note: None of these operations have knowledge of the pipeline |
| 1502 | size of the processor, thus it is up to the assembler to encode |
| 1503 | this information into the addend. */ |
| 1504 | value -= (input_section->output_section->vma |
| 1505 | + input_section->output_offset); |
| 1506 | value -= rel->r_offset; |
| 1507 | value += (signed_addend << howto->size); |
| 1508 | |
| 1509 | /* Previous versions of this code also used to add in the pipeline |
| 1510 | offset here. This is wrong because the linker is not supposed |
| 1511 | to know about such things, and one day it might change. In order |
| 1512 | to support old binaries that need the old behaviour however, so |
| 1513 | we attempt to detect which ABI was used to create the reloc. */ |
| 1514 | if (! globals->no_pipeline_knowledge) |
| 1515 | { |
| 1516 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form */ |
| 1517 | |
| 1518 | i_ehdrp = elf_elfheader (input_bfd); |
| 1519 | |
| 1520 | if (i_ehdrp->e_ident[EI_OSABI] == 0) |
| 1521 | value -= 8; |
| 1522 | } |
| 1523 | } |
| 1524 | |
| 1525 | signed_addend = value; |
| 1526 | signed_addend >>= howto->rightshift; |
| 1527 | |
| 1528 | /* It is not an error for an undefined weak reference to be |
| 1529 | out of range. Any program that branches to such a symbol |
| 1530 | is going to crash anyway, so there is no point worrying |
| 1531 | about getting the destination exactly right. */ |
| 1532 | if (! h || h->root.type != bfd_link_hash_undefweak) |
| 1533 | { |
| 1534 | /* Perform a signed range check. */ |
| 1535 | if ( signed_addend > ((bfd_signed_vma) (howto->dst_mask >> 1)) |
| 1536 | || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1))) |
| 1537 | return bfd_reloc_overflow; |
| 1538 | } |
| 1539 | |
| 1540 | #ifndef OLD_ARM_ABI |
| 1541 | /* If necessary set the H bit in the BLX instruction. */ |
| 1542 | if (r_type == R_ARM_XPC25 && ((value & 2) == 2)) |
| 1543 | value = (signed_addend & howto->dst_mask) |
| 1544 | | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)) |
| 1545 | | (1 << 24); |
| 1546 | else |
| 1547 | #endif |
| 1548 | value = (signed_addend & howto->dst_mask) |
| 1549 | | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)); |
| 1550 | break; |
| 1551 | |
| 1552 | case R_ARM_ABS32: |
| 1553 | value += addend; |
| 1554 | if (sym_flags == STT_ARM_TFUNC) |
| 1555 | value |= 1; |
| 1556 | break; |
| 1557 | |
| 1558 | case R_ARM_REL32: |
| 1559 | value -= (input_section->output_section->vma |
| 1560 | + input_section->output_offset + rel->r_offset); |
| 1561 | value += addend; |
| 1562 | break; |
| 1563 | } |
| 1564 | |
| 1565 | bfd_put_32 (input_bfd, value, hit_data); |
| 1566 | return bfd_reloc_ok; |
| 1567 | |
| 1568 | case R_ARM_ABS8: |
| 1569 | value += addend; |
| 1570 | if ((long) value > 0x7f || (long) value < -0x80) |
| 1571 | return bfd_reloc_overflow; |
| 1572 | |
| 1573 | bfd_put_8 (input_bfd, value, hit_data); |
| 1574 | return bfd_reloc_ok; |
| 1575 | |
| 1576 | case R_ARM_ABS16: |
| 1577 | value += addend; |
| 1578 | |
| 1579 | if ((long) value > 0x7fff || (long) value < -0x8000) |
| 1580 | return bfd_reloc_overflow; |
| 1581 | |
| 1582 | bfd_put_16 (input_bfd, value, hit_data); |
| 1583 | return bfd_reloc_ok; |
| 1584 | |
| 1585 | case R_ARM_ABS12: |
| 1586 | /* Support ldr and str instruction for the arm */ |
| 1587 | /* Also thumb b (unconditional branch). ??? Really? */ |
| 1588 | value += addend; |
| 1589 | |
| 1590 | if ((long) value > 0x7ff || (long) value < -0x800) |
| 1591 | return bfd_reloc_overflow; |
| 1592 | |
| 1593 | value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000); |
| 1594 | bfd_put_32 (input_bfd, value, hit_data); |
| 1595 | return bfd_reloc_ok; |
| 1596 | |
| 1597 | case R_ARM_THM_ABS5: |
| 1598 | /* Support ldr and str instructions for the thumb. */ |
| 1599 | #if USE_REL |
| 1600 | /* Need to refetch addend. */ |
| 1601 | addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; |
| 1602 | /* ??? Need to determine shift amount from operand size. */ |
| 1603 | addend >>= howto->rightshift; |
| 1604 | #endif |
| 1605 | value += addend; |
| 1606 | |
| 1607 | /* ??? Isn't value unsigned? */ |
| 1608 | if ((long) value > 0x1f || (long) value < -0x10) |
| 1609 | return bfd_reloc_overflow; |
| 1610 | |
| 1611 | /* ??? Value needs to be properly shifted into place first. */ |
| 1612 | value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f; |
| 1613 | bfd_put_16 (input_bfd, value, hit_data); |
| 1614 | return bfd_reloc_ok; |
| 1615 | |
| 1616 | #ifndef OLD_ARM_ABI |
| 1617 | case R_ARM_THM_XPC22: |
| 1618 | #endif |
| 1619 | case R_ARM_THM_PC22: |
| 1620 | /* Thumb BL (branch long instruction). */ |
| 1621 | { |
| 1622 | bfd_vma relocation; |
| 1623 | bfd_boolean overflow = FALSE; |
| 1624 | bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); |
| 1625 | bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); |
| 1626 | bfd_signed_vma reloc_signed_max = ((1 << (howto->bitsize - 1)) - 1) >> howto->rightshift; |
| 1627 | bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; |
| 1628 | bfd_vma check; |
| 1629 | bfd_signed_vma signed_check; |
| 1630 | |
| 1631 | #if USE_REL |
| 1632 | /* Need to refetch the addend and squish the two 11 bit pieces |
| 1633 | together. */ |
| 1634 | { |
| 1635 | bfd_vma upper = upper_insn & 0x7ff; |
| 1636 | bfd_vma lower = lower_insn & 0x7ff; |
| 1637 | upper = (upper ^ 0x400) - 0x400; /* Sign extend. */ |
| 1638 | addend = (upper << 12) | (lower << 1); |
| 1639 | signed_addend = addend; |
| 1640 | } |
| 1641 | #endif |
| 1642 | #ifndef OLD_ARM_ABI |
| 1643 | if (r_type == R_ARM_THM_XPC22) |
| 1644 | { |
| 1645 | /* Check for Thumb to Thumb call. */ |
| 1646 | /* FIXME: Should we translate the instruction into a BL |
| 1647 | instruction instead ? */ |
| 1648 | if (sym_flags == STT_ARM_TFUNC) |
| 1649 | (*_bfd_error_handler) (_("\ |
| 1650 | %s: Warning: Thumb BLX instruction targets thumb function '%s'."), |
| 1651 | bfd_archive_filename (input_bfd), |
| 1652 | h ? h->root.root.string : "(local)"); |
| 1653 | } |
| 1654 | else |
| 1655 | #endif |
| 1656 | { |
| 1657 | /* If it is not a call to Thumb, assume call to Arm. |
| 1658 | If it is a call relative to a section name, then it is not a |
| 1659 | function call at all, but rather a long jump. */ |
| 1660 | if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION) |
| 1661 | { |
| 1662 | if (elf32_thumb_to_arm_stub |
| 1663 | (info, sym_name, input_bfd, output_bfd, input_section, |
| 1664 | hit_data, sym_sec, rel->r_offset, signed_addend, value)) |
| 1665 | return bfd_reloc_ok; |
| 1666 | else |
| 1667 | return bfd_reloc_dangerous; |
| 1668 | } |
| 1669 | } |
| 1670 | |
| 1671 | relocation = value + signed_addend; |
| 1672 | |
| 1673 | relocation -= (input_section->output_section->vma |
| 1674 | + input_section->output_offset |
| 1675 | + rel->r_offset); |
| 1676 | |
| 1677 | if (! globals->no_pipeline_knowledge) |
| 1678 | { |
| 1679 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form. */ |
| 1680 | |
| 1681 | i_ehdrp = elf_elfheader (input_bfd); |
| 1682 | |
| 1683 | /* Previous versions of this code also used to add in the pipline |
| 1684 | offset here. This is wrong because the linker is not supposed |
| 1685 | to know about such things, and one day it might change. In order |
| 1686 | to support old binaries that need the old behaviour however, so |
| 1687 | we attempt to detect which ABI was used to create the reloc. */ |
| 1688 | if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 |
| 1689 | || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0 |
| 1690 | || i_ehdrp->e_ident[EI_OSABI] == 0) |
| 1691 | relocation += 4; |
| 1692 | } |
| 1693 | |
| 1694 | check = relocation >> howto->rightshift; |
| 1695 | |
| 1696 | /* If this is a signed value, the rightshift just dropped |
| 1697 | leading 1 bits (assuming twos complement). */ |
| 1698 | if ((bfd_signed_vma) relocation >= 0) |
| 1699 | signed_check = check; |
| 1700 | else |
| 1701 | signed_check = check | ~((bfd_vma) -1 >> howto->rightshift); |
| 1702 | |
| 1703 | /* Assumes two's complement. */ |
| 1704 | if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) |
| 1705 | overflow = TRUE; |
| 1706 | |
| 1707 | #ifndef OLD_ARM_ABI |
| 1708 | if (r_type == R_ARM_THM_XPC22 |
| 1709 | && ((lower_insn & 0x1800) == 0x0800)) |
| 1710 | /* For a BLX instruction, make sure that the relocation is rounded up |
| 1711 | to a word boundary. This follows the semantics of the instruction |
| 1712 | which specifies that bit 1 of the target address will come from bit |
| 1713 | 1 of the base address. */ |
| 1714 | relocation = (relocation + 2) & ~ 3; |
| 1715 | #endif |
| 1716 | /* Put RELOCATION back into the insn. */ |
| 1717 | upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff); |
| 1718 | lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff); |
| 1719 | |
| 1720 | /* Put the relocated value back in the object file: */ |
| 1721 | bfd_put_16 (input_bfd, upper_insn, hit_data); |
| 1722 | bfd_put_16 (input_bfd, lower_insn, hit_data + 2); |
| 1723 | |
| 1724 | return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); |
| 1725 | } |
| 1726 | break; |
| 1727 | |
| 1728 | case R_ARM_THM_PC11: |
| 1729 | /* Thumb B (branch) instruction). */ |
| 1730 | { |
| 1731 | bfd_signed_vma relocation; |
| 1732 | bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; |
| 1733 | bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; |
| 1734 | bfd_signed_vma signed_check; |
| 1735 | |
| 1736 | #if USE_REL |
| 1737 | /* Need to refetch addend. */ |
| 1738 | addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; |
| 1739 | if (addend & ((howto->src_mask + 1) >> 1)) |
| 1740 | { |
| 1741 | signed_addend = -1; |
| 1742 | signed_addend &= ~ howto->src_mask; |
| 1743 | signed_addend |= addend; |
| 1744 | } |
| 1745 | else |
| 1746 | signed_addend = addend; |
| 1747 | /* The value in the insn has been right shifted. We need to |
| 1748 | undo this, so that we can perform the address calculation |
| 1749 | in terms of bytes. */ |
| 1750 | signed_addend <<= howto->rightshift; |
| 1751 | #endif |
| 1752 | relocation = value + signed_addend; |
| 1753 | |
| 1754 | relocation -= (input_section->output_section->vma |
| 1755 | + input_section->output_offset |
| 1756 | + rel->r_offset); |
| 1757 | |
| 1758 | relocation >>= howto->rightshift; |
| 1759 | signed_check = relocation; |
| 1760 | relocation &= howto->dst_mask; |
| 1761 | relocation |= (bfd_get_16 (input_bfd, hit_data) & (~ howto->dst_mask)); |
| 1762 | |
| 1763 | bfd_put_16 (input_bfd, relocation, hit_data); |
| 1764 | |
| 1765 | /* Assumes two's complement. */ |
| 1766 | if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) |
| 1767 | return bfd_reloc_overflow; |
| 1768 | |
| 1769 | return bfd_reloc_ok; |
| 1770 | } |
| 1771 | |
| 1772 | #ifndef OLD_ARM_ABI |
| 1773 | case R_ARM_ALU_PCREL7_0: |
| 1774 | case R_ARM_ALU_PCREL15_8: |
| 1775 | case R_ARM_ALU_PCREL23_15: |
| 1776 | { |
| 1777 | bfd_vma insn; |
| 1778 | bfd_vma relocation; |
| 1779 | |
| 1780 | insn = bfd_get_32 (input_bfd, hit_data); |
| 1781 | #if USE_REL |
| 1782 | /* Extract the addend. */ |
| 1783 | addend = (insn & 0xff) << ((insn & 0xf00) >> 7); |
| 1784 | signed_addend = addend; |
| 1785 | #endif |
| 1786 | relocation = value + signed_addend; |
| 1787 | |
| 1788 | relocation -= (input_section->output_section->vma |
| 1789 | + input_section->output_offset |
| 1790 | + rel->r_offset); |
| 1791 | insn = (insn & ~0xfff) |
| 1792 | | ((howto->bitpos << 7) & 0xf00) |
| 1793 | | ((relocation >> howto->bitpos) & 0xff); |
| 1794 | bfd_put_32 (input_bfd, value, hit_data); |
| 1795 | } |
| 1796 | return bfd_reloc_ok; |
| 1797 | #endif |
| 1798 | |
| 1799 | case R_ARM_GNU_VTINHERIT: |
| 1800 | case R_ARM_GNU_VTENTRY: |
| 1801 | return bfd_reloc_ok; |
| 1802 | |
| 1803 | case R_ARM_COPY: |
| 1804 | return bfd_reloc_notsupported; |
| 1805 | |
| 1806 | case R_ARM_GLOB_DAT: |
| 1807 | return bfd_reloc_notsupported; |
| 1808 | |
| 1809 | case R_ARM_JUMP_SLOT: |
| 1810 | return bfd_reloc_notsupported; |
| 1811 | |
| 1812 | case R_ARM_RELATIVE: |
| 1813 | return bfd_reloc_notsupported; |
| 1814 | |
| 1815 | case R_ARM_GOTOFF: |
| 1816 | /* Relocation is relative to the start of the |
| 1817 | global offset table. */ |
| 1818 | |
| 1819 | BFD_ASSERT (sgot != NULL); |
| 1820 | if (sgot == NULL) |
| 1821 | return bfd_reloc_notsupported; |
| 1822 | |
| 1823 | /* If we are addressing a Thumb function, we need to adjust the |
| 1824 | address by one, so that attempts to call the function pointer will |
| 1825 | correctly interpret it as Thumb code. */ |
| 1826 | if (sym_flags == STT_ARM_TFUNC) |
| 1827 | value += 1; |
| 1828 | |
| 1829 | /* Note that sgot->output_offset is not involved in this |
| 1830 | calculation. We always want the start of .got. If we |
| 1831 | define _GLOBAL_OFFSET_TABLE in a different way, as is |
| 1832 | permitted by the ABI, we might have to change this |
| 1833 | calculation. */ |
| 1834 | value -= sgot->output_section->vma; |
| 1835 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1836 | contents, rel->r_offset, value, |
| 1837 | (bfd_vma) 0); |
| 1838 | |
| 1839 | case R_ARM_GOTPC: |
| 1840 | /* Use global offset table as symbol value. */ |
| 1841 | BFD_ASSERT (sgot != NULL); |
| 1842 | |
| 1843 | if (sgot == NULL) |
| 1844 | return bfd_reloc_notsupported; |
| 1845 | |
| 1846 | value = sgot->output_section->vma; |
| 1847 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1848 | contents, rel->r_offset, value, |
| 1849 | (bfd_vma) 0); |
| 1850 | |
| 1851 | case R_ARM_GOT32: |
| 1852 | /* Relocation is to the entry for this symbol in the |
| 1853 | global offset table. */ |
| 1854 | if (sgot == NULL) |
| 1855 | return bfd_reloc_notsupported; |
| 1856 | |
| 1857 | if (h != NULL) |
| 1858 | { |
| 1859 | bfd_vma off; |
| 1860 | bfd_boolean dyn; |
| 1861 | |
| 1862 | off = h->got.offset; |
| 1863 | BFD_ASSERT (off != (bfd_vma) -1); |
| 1864 | dyn = globals->root.dynamic_sections_created; |
| 1865 | |
| 1866 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| 1867 | || (info->shared |
| 1868 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 1869 | || (ELF_ST_VISIBILITY (h->other) |
| 1870 | && h->root.type == bfd_link_hash_undefweak)) |
| 1871 | { |
| 1872 | /* This is actually a static link, or it is a -Bsymbolic link |
| 1873 | and the symbol is defined locally. We must initialize this |
| 1874 | entry in the global offset table. Since the offset must |
| 1875 | always be a multiple of 4, we use the least significant bit |
| 1876 | to record whether we have initialized it already. |
| 1877 | |
| 1878 | When doing a dynamic link, we create a .rel.got relocation |
| 1879 | entry to initialize the value. This is done in the |
| 1880 | finish_dynamic_symbol routine. */ |
| 1881 | if ((off & 1) != 0) |
| 1882 | off &= ~1; |
| 1883 | else |
| 1884 | { |
| 1885 | /* If we are addressing a Thumb function, we need to |
| 1886 | adjust the address by one, so that attempts to |
| 1887 | call the function pointer will correctly |
| 1888 | interpret it as Thumb code. */ |
| 1889 | if (sym_flags == STT_ARM_TFUNC) |
| 1890 | value |= 1; |
| 1891 | |
| 1892 | bfd_put_32 (output_bfd, value, sgot->contents + off); |
| 1893 | h->got.offset |= 1; |
| 1894 | } |
| 1895 | } |
| 1896 | |
| 1897 | value = sgot->output_offset + off; |
| 1898 | } |
| 1899 | else |
| 1900 | { |
| 1901 | bfd_vma off; |
| 1902 | |
| 1903 | BFD_ASSERT (local_got_offsets != NULL && |
| 1904 | local_got_offsets[r_symndx] != (bfd_vma) -1); |
| 1905 | |
| 1906 | off = local_got_offsets[r_symndx]; |
| 1907 | |
| 1908 | /* The offset must always be a multiple of 4. We use the |
| 1909 | least significant bit to record whether we have already |
| 1910 | generated the necessary reloc. */ |
| 1911 | if ((off & 1) != 0) |
| 1912 | off &= ~1; |
| 1913 | else |
| 1914 | { |
| 1915 | bfd_put_32 (output_bfd, value, sgot->contents + off); |
| 1916 | |
| 1917 | if (info->shared) |
| 1918 | { |
| 1919 | asection * srelgot; |
| 1920 | Elf_Internal_Rela outrel; |
| 1921 | bfd_byte *loc; |
| 1922 | |
| 1923 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); |
| 1924 | BFD_ASSERT (srelgot != NULL); |
| 1925 | |
| 1926 | outrel.r_offset = (sgot->output_section->vma |
| 1927 | + sgot->output_offset |
| 1928 | + off); |
| 1929 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); |
| 1930 | loc = srelgot->contents; |
| 1931 | loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rel); |
| 1932 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 1933 | } |
| 1934 | |
| 1935 | local_got_offsets[r_symndx] |= 1; |
| 1936 | } |
| 1937 | |
| 1938 | value = sgot->output_offset + off; |
| 1939 | } |
| 1940 | |
| 1941 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1942 | contents, rel->r_offset, value, |
| 1943 | (bfd_vma) 0); |
| 1944 | |
| 1945 | case R_ARM_SBREL32: |
| 1946 | return bfd_reloc_notsupported; |
| 1947 | |
| 1948 | case R_ARM_AMP_VCALL9: |
| 1949 | return bfd_reloc_notsupported; |
| 1950 | |
| 1951 | case R_ARM_RSBREL32: |
| 1952 | return bfd_reloc_notsupported; |
| 1953 | |
| 1954 | case R_ARM_THM_RPC22: |
| 1955 | return bfd_reloc_notsupported; |
| 1956 | |
| 1957 | case R_ARM_RREL32: |
| 1958 | return bfd_reloc_notsupported; |
| 1959 | |
| 1960 | case R_ARM_RABS32: |
| 1961 | return bfd_reloc_notsupported; |
| 1962 | |
| 1963 | case R_ARM_RPC24: |
| 1964 | return bfd_reloc_notsupported; |
| 1965 | |
| 1966 | case R_ARM_RBASE: |
| 1967 | return bfd_reloc_notsupported; |
| 1968 | |
| 1969 | default: |
| 1970 | return bfd_reloc_notsupported; |
| 1971 | } |
| 1972 | } |
| 1973 | |
| 1974 | #if USE_REL |
| 1975 | /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */ |
| 1976 | static void |
| 1977 | arm_add_to_rel (abfd, address, howto, increment) |
| 1978 | bfd * abfd; |
| 1979 | bfd_byte * address; |
| 1980 | reloc_howto_type * howto; |
| 1981 | bfd_signed_vma increment; |
| 1982 | { |
| 1983 | bfd_signed_vma addend; |
| 1984 | |
| 1985 | if (howto->type == R_ARM_THM_PC22) |
| 1986 | { |
| 1987 | int upper_insn, lower_insn; |
| 1988 | int upper, lower; |
| 1989 | |
| 1990 | upper_insn = bfd_get_16 (abfd, address); |
| 1991 | lower_insn = bfd_get_16 (abfd, address + 2); |
| 1992 | upper = upper_insn & 0x7ff; |
| 1993 | lower = lower_insn & 0x7ff; |
| 1994 | |
| 1995 | addend = (upper << 12) | (lower << 1); |
| 1996 | addend += increment; |
| 1997 | addend >>= 1; |
| 1998 | |
| 1999 | upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff); |
| 2000 | lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff); |
| 2001 | |
| 2002 | bfd_put_16 (abfd, (bfd_vma) upper_insn, address); |
| 2003 | bfd_put_16 (abfd, (bfd_vma) lower_insn, address + 2); |
| 2004 | } |
| 2005 | else |
| 2006 | { |
| 2007 | bfd_vma contents; |
| 2008 | |
| 2009 | contents = bfd_get_32 (abfd, address); |
| 2010 | |
| 2011 | /* Get the (signed) value from the instruction. */ |
| 2012 | addend = contents & howto->src_mask; |
| 2013 | if (addend & ((howto->src_mask + 1) >> 1)) |
| 2014 | { |
| 2015 | bfd_signed_vma mask; |
| 2016 | |
| 2017 | mask = -1; |
| 2018 | mask &= ~ howto->src_mask; |
| 2019 | addend |= mask; |
| 2020 | } |
| 2021 | |
| 2022 | /* Add in the increment, (which is a byte value). */ |
| 2023 | switch (howto->type) |
| 2024 | { |
| 2025 | default: |
| 2026 | addend += increment; |
| 2027 | break; |
| 2028 | |
| 2029 | case R_ARM_PC24: |
| 2030 | addend <<= howto->size; |
| 2031 | addend += increment; |
| 2032 | |
| 2033 | /* Should we check for overflow here ? */ |
| 2034 | |
| 2035 | /* Drop any undesired bits. */ |
| 2036 | addend >>= howto->rightshift; |
| 2037 | break; |
| 2038 | } |
| 2039 | |
| 2040 | contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask); |
| 2041 | |
| 2042 | bfd_put_32 (abfd, contents, address); |
| 2043 | } |
| 2044 | } |
| 2045 | #endif /* USE_REL */ |
| 2046 | |
| 2047 | /* Relocate an ARM ELF section. */ |
| 2048 | static bfd_boolean |
| 2049 | elf32_arm_relocate_section (output_bfd, info, input_bfd, input_section, |
| 2050 | contents, relocs, local_syms, local_sections) |
| 2051 | bfd *output_bfd; |
| 2052 | struct bfd_link_info *info; |
| 2053 | bfd *input_bfd; |
| 2054 | asection *input_section; |
| 2055 | bfd_byte *contents; |
| 2056 | Elf_Internal_Rela *relocs; |
| 2057 | Elf_Internal_Sym *local_syms; |
| 2058 | asection **local_sections; |
| 2059 | { |
| 2060 | Elf_Internal_Shdr *symtab_hdr; |
| 2061 | struct elf_link_hash_entry **sym_hashes; |
| 2062 | Elf_Internal_Rela *rel; |
| 2063 | Elf_Internal_Rela *relend; |
| 2064 | const char *name; |
| 2065 | |
| 2066 | #if !USE_REL |
| 2067 | if (info->relocatable) |
| 2068 | return TRUE; |
| 2069 | #endif |
| 2070 | |
| 2071 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 2072 | sym_hashes = elf_sym_hashes (input_bfd); |
| 2073 | |
| 2074 | rel = relocs; |
| 2075 | relend = relocs + input_section->reloc_count; |
| 2076 | for (; rel < relend; rel++) |
| 2077 | { |
| 2078 | int r_type; |
| 2079 | reloc_howto_type * howto; |
| 2080 | unsigned long r_symndx; |
| 2081 | Elf_Internal_Sym * sym; |
| 2082 | asection * sec; |
| 2083 | struct elf_link_hash_entry * h; |
| 2084 | bfd_vma relocation; |
| 2085 | bfd_reloc_status_type r; |
| 2086 | arelent bfd_reloc; |
| 2087 | |
| 2088 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2089 | r_type = ELF32_R_TYPE (rel->r_info); |
| 2090 | |
| 2091 | if ( r_type == R_ARM_GNU_VTENTRY |
| 2092 | || r_type == R_ARM_GNU_VTINHERIT) |
| 2093 | continue; |
| 2094 | |
| 2095 | elf32_arm_info_to_howto (input_bfd, & bfd_reloc, rel); |
| 2096 | howto = bfd_reloc.howto; |
| 2097 | |
| 2098 | #if USE_REL |
| 2099 | if (info->relocatable) |
| 2100 | { |
| 2101 | /* This is a relocatable link. We don't have to change |
| 2102 | anything, unless the reloc is against a section symbol, |
| 2103 | in which case we have to adjust according to where the |
| 2104 | section symbol winds up in the output section. */ |
| 2105 | if (r_symndx < symtab_hdr->sh_info) |
| 2106 | { |
| 2107 | sym = local_syms + r_symndx; |
| 2108 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 2109 | { |
| 2110 | sec = local_sections[r_symndx]; |
| 2111 | arm_add_to_rel (input_bfd, contents + rel->r_offset, |
| 2112 | howto, |
| 2113 | (bfd_signed_vma) (sec->output_offset |
| 2114 | + sym->st_value)); |
| 2115 | } |
| 2116 | } |
| 2117 | |
| 2118 | continue; |
| 2119 | } |
| 2120 | #endif |
| 2121 | |
| 2122 | /* This is a final link. */ |
| 2123 | h = NULL; |
| 2124 | sym = NULL; |
| 2125 | sec = NULL; |
| 2126 | |
| 2127 | if (r_symndx < symtab_hdr->sh_info) |
| 2128 | { |
| 2129 | sym = local_syms + r_symndx; |
| 2130 | sec = local_sections[r_symndx]; |
| 2131 | #if USE_REL |
| 2132 | relocation = (sec->output_section->vma |
| 2133 | + sec->output_offset |
| 2134 | + sym->st_value); |
| 2135 | if ((sec->flags & SEC_MERGE) |
| 2136 | && ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 2137 | { |
| 2138 | asection *msec; |
| 2139 | bfd_vma addend, value; |
| 2140 | |
| 2141 | if (howto->rightshift) |
| 2142 | { |
| 2143 | (*_bfd_error_handler) |
| 2144 | (_("%s(%s+0x%lx): %s relocation against SEC_MERGE section"), |
| 2145 | bfd_archive_filename (input_bfd), |
| 2146 | bfd_get_section_name (input_bfd, input_section), |
| 2147 | (long) rel->r_offset, howto->name); |
| 2148 | return FALSE; |
| 2149 | } |
| 2150 | |
| 2151 | value = bfd_get_32 (input_bfd, contents + rel->r_offset); |
| 2152 | |
| 2153 | /* Get the (signed) value from the instruction. */ |
| 2154 | addend = value & howto->src_mask; |
| 2155 | if (addend & ((howto->src_mask + 1) >> 1)) |
| 2156 | { |
| 2157 | bfd_signed_vma mask; |
| 2158 | |
| 2159 | mask = -1; |
| 2160 | mask &= ~ howto->src_mask; |
| 2161 | addend |= mask; |
| 2162 | } |
| 2163 | msec = sec; |
| 2164 | addend = |
| 2165 | _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend) |
| 2166 | - relocation; |
| 2167 | addend += msec->output_section->vma + msec->output_offset; |
| 2168 | value = (value & ~ howto->dst_mask) | (addend & howto->dst_mask); |
| 2169 | bfd_put_32 (input_bfd, value, contents + rel->r_offset); |
| 2170 | } |
| 2171 | #else |
| 2172 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 2173 | #endif |
| 2174 | } |
| 2175 | else |
| 2176 | { |
| 2177 | bfd_boolean warned; |
| 2178 | bfd_boolean unresolved_reloc; |
| 2179 | |
| 2180 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 2181 | r_symndx, symtab_hdr, sym_hashes, |
| 2182 | h, sec, relocation, |
| 2183 | unresolved_reloc, warned); |
| 2184 | |
| 2185 | if (unresolved_reloc || relocation != 0) |
| 2186 | { |
| 2187 | /* In these cases, we don't need the relocation value. |
| 2188 | We check specially because in some obscure cases |
| 2189 | sec->output_section will be NULL. */ |
| 2190 | switch (r_type) |
| 2191 | { |
| 2192 | case R_ARM_PC24: |
| 2193 | case R_ARM_ABS32: |
| 2194 | case R_ARM_THM_PC22: |
| 2195 | case R_ARM_PLT32: |
| 2196 | |
| 2197 | if (info->shared |
| 2198 | && ( |
| 2199 | (!info->symbolic && h->dynindx != -1) |
| 2200 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 |
| 2201 | ) |
| 2202 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2203 | && ((input_section->flags & SEC_ALLOC) != 0 |
| 2204 | /* DWARF will emit R_ARM_ABS32 relocations in its |
| 2205 | sections against symbols defined externally |
| 2206 | in shared libraries. We can't do anything |
| 2207 | with them here. */ |
| 2208 | || ((input_section->flags & SEC_DEBUGGING) != 0 |
| 2209 | && (h->elf_link_hash_flags |
| 2210 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) |
| 2211 | ) |
| 2212 | relocation = 0; |
| 2213 | break; |
| 2214 | |
| 2215 | case R_ARM_GOTPC: |
| 2216 | relocation = 0; |
| 2217 | break; |
| 2218 | |
| 2219 | case R_ARM_GOT32: |
| 2220 | if ((WILL_CALL_FINISH_DYNAMIC_SYMBOL |
| 2221 | (elf_hash_table (info)->dynamic_sections_created, |
| 2222 | info->shared, h)) |
| 2223 | && (!info->shared |
| 2224 | || (!info->symbolic && h->dynindx != -1) |
| 2225 | || (h->elf_link_hash_flags |
| 2226 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 2227 | relocation = 0; |
| 2228 | break; |
| 2229 | |
| 2230 | default: |
| 2231 | if (unresolved_reloc) |
| 2232 | _bfd_error_handler |
| 2233 | (_("%s: warning: unresolvable relocation %d against symbol `%s' from %s section"), |
| 2234 | bfd_archive_filename (input_bfd), |
| 2235 | r_type, |
| 2236 | h->root.root.string, |
| 2237 | bfd_get_section_name (input_bfd, input_section)); |
| 2238 | break; |
| 2239 | } |
| 2240 | } |
| 2241 | } |
| 2242 | |
| 2243 | if (h != NULL) |
| 2244 | name = h->root.root.string; |
| 2245 | else |
| 2246 | { |
| 2247 | name = (bfd_elf_string_from_elf_section |
| 2248 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); |
| 2249 | if (name == NULL || *name == '\0') |
| 2250 | name = bfd_section_name (input_bfd, sec); |
| 2251 | } |
| 2252 | |
| 2253 | r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, |
| 2254 | input_section, contents, rel, |
| 2255 | relocation, info, sec, name, |
| 2256 | (h ? ELF_ST_TYPE (h->type) : |
| 2257 | ELF_ST_TYPE (sym->st_info)), h); |
| 2258 | |
| 2259 | if (r != bfd_reloc_ok) |
| 2260 | { |
| 2261 | const char * msg = (const char *) 0; |
| 2262 | |
| 2263 | switch (r) |
| 2264 | { |
| 2265 | case bfd_reloc_overflow: |
| 2266 | /* If the overflowing reloc was to an undefined symbol, |
| 2267 | we have already printed one error message and there |
| 2268 | is no point complaining again. */ |
| 2269 | if ((! h || |
| 2270 | h->root.type != bfd_link_hash_undefined) |
| 2271 | && (!((*info->callbacks->reloc_overflow) |
| 2272 | (info, name, howto->name, (bfd_vma) 0, |
| 2273 | input_bfd, input_section, rel->r_offset)))) |
| 2274 | return FALSE; |
| 2275 | break; |
| 2276 | |
| 2277 | case bfd_reloc_undefined: |
| 2278 | if (!((*info->callbacks->undefined_symbol) |
| 2279 | (info, name, input_bfd, input_section, |
| 2280 | rel->r_offset, TRUE))) |
| 2281 | return FALSE; |
| 2282 | break; |
| 2283 | |
| 2284 | case bfd_reloc_outofrange: |
| 2285 | msg = _("internal error: out of range error"); |
| 2286 | goto common_error; |
| 2287 | |
| 2288 | case bfd_reloc_notsupported: |
| 2289 | msg = _("internal error: unsupported relocation error"); |
| 2290 | goto common_error; |
| 2291 | |
| 2292 | case bfd_reloc_dangerous: |
| 2293 | msg = _("internal error: dangerous error"); |
| 2294 | goto common_error; |
| 2295 | |
| 2296 | default: |
| 2297 | msg = _("internal error: unknown error"); |
| 2298 | /* fall through */ |
| 2299 | |
| 2300 | common_error: |
| 2301 | if (!((*info->callbacks->warning) |
| 2302 | (info, msg, name, input_bfd, input_section, |
| 2303 | rel->r_offset))) |
| 2304 | return FALSE; |
| 2305 | break; |
| 2306 | } |
| 2307 | } |
| 2308 | } |
| 2309 | |
| 2310 | return TRUE; |
| 2311 | } |
| 2312 | |
| 2313 | /* Set the right machine number. */ |
| 2314 | |
| 2315 | static bfd_boolean |
| 2316 | elf32_arm_object_p (abfd) |
| 2317 | bfd *abfd; |
| 2318 | { |
| 2319 | unsigned int mach; |
| 2320 | |
| 2321 | mach = bfd_arm_get_mach_from_notes (abfd, ARM_NOTE_SECTION); |
| 2322 | |
| 2323 | if (mach != bfd_mach_arm_unknown) |
| 2324 | bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach); |
| 2325 | |
| 2326 | else if (elf_elfheader (abfd)->e_flags & EF_ARM_MAVERICK_FLOAT) |
| 2327 | bfd_default_set_arch_mach (abfd, bfd_arch_arm, bfd_mach_arm_ep9312); |
| 2328 | |
| 2329 | else |
| 2330 | bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach); |
| 2331 | |
| 2332 | return TRUE; |
| 2333 | } |
| 2334 | |
| 2335 | /* Function to keep ARM specific flags in the ELF header. */ |
| 2336 | static bfd_boolean |
| 2337 | elf32_arm_set_private_flags (abfd, flags) |
| 2338 | bfd *abfd; |
| 2339 | flagword flags; |
| 2340 | { |
| 2341 | if (elf_flags_init (abfd) |
| 2342 | && elf_elfheader (abfd)->e_flags != flags) |
| 2343 | { |
| 2344 | if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN) |
| 2345 | { |
| 2346 | if (flags & EF_ARM_INTERWORK) |
| 2347 | (*_bfd_error_handler) (_("\ |
| 2348 | Warning: Not setting interworking flag of %s since it has already been specified as non-interworking"), |
| 2349 | bfd_archive_filename (abfd)); |
| 2350 | else |
| 2351 | _bfd_error_handler (_("\ |
| 2352 | Warning: Clearing the interworking flag of %s due to outside request"), |
| 2353 | bfd_archive_filename (abfd)); |
| 2354 | } |
| 2355 | } |
| 2356 | else |
| 2357 | { |
| 2358 | elf_elfheader (abfd)->e_flags = flags; |
| 2359 | elf_flags_init (abfd) = TRUE; |
| 2360 | } |
| 2361 | |
| 2362 | return TRUE; |
| 2363 | } |
| 2364 | |
| 2365 | /* Copy backend specific data from one object module to another. */ |
| 2366 | |
| 2367 | static bfd_boolean |
| 2368 | elf32_arm_copy_private_bfd_data (ibfd, obfd) |
| 2369 | bfd *ibfd; |
| 2370 | bfd *obfd; |
| 2371 | { |
| 2372 | flagword in_flags; |
| 2373 | flagword out_flags; |
| 2374 | |
| 2375 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 2376 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 2377 | return TRUE; |
| 2378 | |
| 2379 | in_flags = elf_elfheader (ibfd)->e_flags; |
| 2380 | out_flags = elf_elfheader (obfd)->e_flags; |
| 2381 | |
| 2382 | if (elf_flags_init (obfd) |
| 2383 | && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN |
| 2384 | && in_flags != out_flags) |
| 2385 | { |
| 2386 | /* Cannot mix APCS26 and APCS32 code. */ |
| 2387 | if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26)) |
| 2388 | return FALSE; |
| 2389 | |
| 2390 | /* Cannot mix float APCS and non-float APCS code. */ |
| 2391 | if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT)) |
| 2392 | return FALSE; |
| 2393 | |
| 2394 | /* If the src and dest have different interworking flags |
| 2395 | then turn off the interworking bit. */ |
| 2396 | if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK)) |
| 2397 | { |
| 2398 | if (out_flags & EF_ARM_INTERWORK) |
| 2399 | _bfd_error_handler (_("\ |
| 2400 | Warning: Clearing the interworking flag of %s because non-interworking code in %s has been linked with it"), |
| 2401 | bfd_get_filename (obfd), |
| 2402 | bfd_archive_filename (ibfd)); |
| 2403 | |
| 2404 | in_flags &= ~EF_ARM_INTERWORK; |
| 2405 | } |
| 2406 | |
| 2407 | /* Likewise for PIC, though don't warn for this case. */ |
| 2408 | if ((in_flags & EF_ARM_PIC) != (out_flags & EF_ARM_PIC)) |
| 2409 | in_flags &= ~EF_ARM_PIC; |
| 2410 | } |
| 2411 | |
| 2412 | elf_elfheader (obfd)->e_flags = in_flags; |
| 2413 | elf_flags_init (obfd) = TRUE; |
| 2414 | |
| 2415 | return TRUE; |
| 2416 | } |
| 2417 | |
| 2418 | /* Merge backend specific data from an object file to the output |
| 2419 | object file when linking. */ |
| 2420 | |
| 2421 | static bfd_boolean |
| 2422 | elf32_arm_merge_private_bfd_data (ibfd, obfd) |
| 2423 | bfd * ibfd; |
| 2424 | bfd * obfd; |
| 2425 | { |
| 2426 | flagword out_flags; |
| 2427 | flagword in_flags; |
| 2428 | bfd_boolean flags_compatible = TRUE; |
| 2429 | asection *sec; |
| 2430 | |
| 2431 | /* Check if we have the same endianess. */ |
| 2432 | if (! _bfd_generic_verify_endian_match (ibfd, obfd)) |
| 2433 | return FALSE; |
| 2434 | |
| 2435 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 2436 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 2437 | return TRUE; |
| 2438 | |
| 2439 | /* The input BFD must have had its flags initialised. */ |
| 2440 | /* The following seems bogus to me -- The flags are initialized in |
| 2441 | the assembler but I don't think an elf_flags_init field is |
| 2442 | written into the object. */ |
| 2443 | /* BFD_ASSERT (elf_flags_init (ibfd)); */ |
| 2444 | |
| 2445 | in_flags = elf_elfheader (ibfd)->e_flags; |
| 2446 | out_flags = elf_elfheader (obfd)->e_flags; |
| 2447 | |
| 2448 | if (!elf_flags_init (obfd)) |
| 2449 | { |
| 2450 | /* If the input is the default architecture and had the default |
| 2451 | flags then do not bother setting the flags for the output |
| 2452 | architecture, instead allow future merges to do this. If no |
| 2453 | future merges ever set these flags then they will retain their |
| 2454 | uninitialised values, which surprise surprise, correspond |
| 2455 | to the default values. */ |
| 2456 | if (bfd_get_arch_info (ibfd)->the_default |
| 2457 | && elf_elfheader (ibfd)->e_flags == 0) |
| 2458 | return TRUE; |
| 2459 | |
| 2460 | elf_flags_init (obfd) = TRUE; |
| 2461 | elf_elfheader (obfd)->e_flags = in_flags; |
| 2462 | |
| 2463 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) |
| 2464 | && bfd_get_arch_info (obfd)->the_default) |
| 2465 | return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); |
| 2466 | |
| 2467 | return TRUE; |
| 2468 | } |
| 2469 | |
| 2470 | /* Determine what should happen if the input ARM architecture |
| 2471 | does not match the output ARM architecture. */ |
| 2472 | if (! bfd_arm_merge_machines (ibfd, obfd)) |
| 2473 | return FALSE; |
| 2474 | |
| 2475 | /* Identical flags must be compatible. */ |
| 2476 | if (in_flags == out_flags) |
| 2477 | return TRUE; |
| 2478 | |
| 2479 | /* Check to see if the input BFD actually contains any sections. If |
| 2480 | not, its flags may not have been initialised either, but it |
| 2481 | cannot actually cause any incompatibility. Do not short-circuit |
| 2482 | dynamic objects; their section list may be emptied by |
| 2483 | elf_link_add_object_symbols. |
| 2484 | |
| 2485 | Also check to see if there are no code sections in the input. |
| 2486 | In this case there is no need to check for code specific flags. |
| 2487 | XXX - do we need to worry about floating-point format compatability |
| 2488 | in data sections ? */ |
| 2489 | if (!(ibfd->flags & DYNAMIC)) |
| 2490 | { |
| 2491 | bfd_boolean null_input_bfd = TRUE; |
| 2492 | bfd_boolean only_data_sections = TRUE; |
| 2493 | |
| 2494 | for (sec = ibfd->sections; sec != NULL; sec = sec->next) |
| 2495 | { |
| 2496 | /* Ignore synthetic glue sections. */ |
| 2497 | if (strcmp (sec->name, ".glue_7") |
| 2498 | && strcmp (sec->name, ".glue_7t")) |
| 2499 | { |
| 2500 | if ((bfd_get_section_flags (ibfd, sec) |
| 2501 | & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) |
| 2502 | == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) |
| 2503 | only_data_sections = FALSE; |
| 2504 | |
| 2505 | null_input_bfd = FALSE; |
| 2506 | break; |
| 2507 | } |
| 2508 | } |
| 2509 | |
| 2510 | if (null_input_bfd || only_data_sections) |
| 2511 | return TRUE; |
| 2512 | } |
| 2513 | |
| 2514 | /* Complain about various flag mismatches. */ |
| 2515 | if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_VERSION (out_flags)) |
| 2516 | { |
| 2517 | _bfd_error_handler (_("\ |
| 2518 | ERROR: %s is compiled for EABI version %d, whereas %s is compiled for version %d"), |
| 2519 | bfd_archive_filename (ibfd), |
| 2520 | (in_flags & EF_ARM_EABIMASK) >> 24, |
| 2521 | bfd_get_filename (obfd), |
| 2522 | (out_flags & EF_ARM_EABIMASK) >> 24); |
| 2523 | return FALSE; |
| 2524 | } |
| 2525 | |
| 2526 | /* Not sure what needs to be checked for EABI versions >= 1. */ |
| 2527 | if (EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN) |
| 2528 | { |
| 2529 | if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26)) |
| 2530 | { |
| 2531 | _bfd_error_handler (_("\ |
| 2532 | ERROR: %s is compiled for APCS-%d, whereas target %s uses APCS-%d"), |
| 2533 | bfd_archive_filename (ibfd), |
| 2534 | in_flags & EF_ARM_APCS_26 ? 26 : 32, |
| 2535 | bfd_get_filename (obfd), |
| 2536 | out_flags & EF_ARM_APCS_26 ? 26 : 32); |
| 2537 | flags_compatible = FALSE; |
| 2538 | } |
| 2539 | |
| 2540 | if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT)) |
| 2541 | { |
| 2542 | if (in_flags & EF_ARM_APCS_FLOAT) |
| 2543 | _bfd_error_handler (_("\ |
| 2544 | ERROR: %s passes floats in float registers, whereas %s passes them in integer registers"), |
| 2545 | bfd_archive_filename (ibfd), |
| 2546 | bfd_get_filename (obfd)); |
| 2547 | else |
| 2548 | _bfd_error_handler (_("\ |
| 2549 | ERROR: %s passes floats in integer registers, whereas %s passes them in float registers"), |
| 2550 | bfd_archive_filename (ibfd), |
| 2551 | bfd_get_filename (obfd)); |
| 2552 | |
| 2553 | flags_compatible = FALSE; |
| 2554 | } |
| 2555 | |
| 2556 | if ((in_flags & EF_ARM_VFP_FLOAT) != (out_flags & EF_ARM_VFP_FLOAT)) |
| 2557 | { |
| 2558 | if (in_flags & EF_ARM_VFP_FLOAT) |
| 2559 | _bfd_error_handler (_("\ |
| 2560 | ERROR: %s uses VFP instructions, whereas %s does not"), |
| 2561 | bfd_archive_filename (ibfd), |
| 2562 | bfd_get_filename (obfd)); |
| 2563 | else |
| 2564 | _bfd_error_handler (_("\ |
| 2565 | ERROR: %s uses FPA instructions, whereas %s does not"), |
| 2566 | bfd_archive_filename (ibfd), |
| 2567 | bfd_get_filename (obfd)); |
| 2568 | |
| 2569 | flags_compatible = FALSE; |
| 2570 | } |
| 2571 | |
| 2572 | if ((in_flags & EF_ARM_MAVERICK_FLOAT) != (out_flags & EF_ARM_MAVERICK_FLOAT)) |
| 2573 | { |
| 2574 | if (in_flags & EF_ARM_MAVERICK_FLOAT) |
| 2575 | _bfd_error_handler (_("\ |
| 2576 | ERROR: %s uses Maverick instructions, whereas %s does not"), |
| 2577 | bfd_archive_filename (ibfd), |
| 2578 | bfd_get_filename (obfd)); |
| 2579 | else |
| 2580 | _bfd_error_handler (_("\ |
| 2581 | ERROR: %s does not use Maverick instructions, whereas %s does"), |
| 2582 | bfd_archive_filename (ibfd), |
| 2583 | bfd_get_filename (obfd)); |
| 2584 | |
| 2585 | flags_compatible = FALSE; |
| 2586 | } |
| 2587 | |
| 2588 | #ifdef EF_ARM_SOFT_FLOAT |
| 2589 | if ((in_flags & EF_ARM_SOFT_FLOAT) != (out_flags & EF_ARM_SOFT_FLOAT)) |
| 2590 | { |
| 2591 | /* We can allow interworking between code that is VFP format |
| 2592 | layout, and uses either soft float or integer regs for |
| 2593 | passing floating point arguments and results. We already |
| 2594 | know that the APCS_FLOAT flags match; similarly for VFP |
| 2595 | flags. */ |
| 2596 | if ((in_flags & EF_ARM_APCS_FLOAT) != 0 |
| 2597 | || (in_flags & EF_ARM_VFP_FLOAT) == 0) |
| 2598 | { |
| 2599 | if (in_flags & EF_ARM_SOFT_FLOAT) |
| 2600 | _bfd_error_handler (_("\ |
| 2601 | ERROR: %s uses software FP, whereas %s uses hardware FP"), |
| 2602 | bfd_archive_filename (ibfd), |
| 2603 | bfd_get_filename (obfd)); |
| 2604 | else |
| 2605 | _bfd_error_handler (_("\ |
| 2606 | ERROR: %s uses hardware FP, whereas %s uses software FP"), |
| 2607 | bfd_archive_filename (ibfd), |
| 2608 | bfd_get_filename (obfd)); |
| 2609 | |
| 2610 | flags_compatible = FALSE; |
| 2611 | } |
| 2612 | } |
| 2613 | #endif |
| 2614 | |
| 2615 | /* Interworking mismatch is only a warning. */ |
| 2616 | if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK)) |
| 2617 | { |
| 2618 | if (in_flags & EF_ARM_INTERWORK) |
| 2619 | { |
| 2620 | _bfd_error_handler (_("\ |
| 2621 | Warning: %s supports interworking, whereas %s does not"), |
| 2622 | bfd_archive_filename (ibfd), |
| 2623 | bfd_get_filename (obfd)); |
| 2624 | } |
| 2625 | else |
| 2626 | { |
| 2627 | _bfd_error_handler (_("\ |
| 2628 | Warning: %s does not support interworking, whereas %s does"), |
| 2629 | bfd_archive_filename (ibfd), |
| 2630 | bfd_get_filename (obfd)); |
| 2631 | } |
| 2632 | } |
| 2633 | } |
| 2634 | |
| 2635 | return flags_compatible; |
| 2636 | } |
| 2637 | |
| 2638 | /* Display the flags field. */ |
| 2639 | |
| 2640 | static bfd_boolean |
| 2641 | elf32_arm_print_private_bfd_data (abfd, ptr) |
| 2642 | bfd *abfd; |
| 2643 | PTR ptr; |
| 2644 | { |
| 2645 | FILE * file = (FILE *) ptr; |
| 2646 | unsigned long flags; |
| 2647 | |
| 2648 | BFD_ASSERT (abfd != NULL && ptr != NULL); |
| 2649 | |
| 2650 | /* Print normal ELF private data. */ |
| 2651 | _bfd_elf_print_private_bfd_data (abfd, ptr); |
| 2652 | |
| 2653 | flags = elf_elfheader (abfd)->e_flags; |
| 2654 | /* Ignore init flag - it may not be set, despite the flags field |
| 2655 | containing valid data. */ |
| 2656 | |
| 2657 | /* xgettext:c-format */ |
| 2658 | fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); |
| 2659 | |
| 2660 | switch (EF_ARM_EABI_VERSION (flags)) |
| 2661 | { |
| 2662 | case EF_ARM_EABI_UNKNOWN: |
| 2663 | /* The following flag bits are GNU extensions and not part of the |
| 2664 | official ARM ELF extended ABI. Hence they are only decoded if |
| 2665 | the EABI version is not set. */ |
| 2666 | if (flags & EF_ARM_INTERWORK) |
| 2667 | fprintf (file, _(" [interworking enabled]")); |
| 2668 | |
| 2669 | if (flags & EF_ARM_APCS_26) |
| 2670 | fprintf (file, " [APCS-26]"); |
| 2671 | else |
| 2672 | fprintf (file, " [APCS-32]"); |
| 2673 | |
| 2674 | if (flags & EF_ARM_VFP_FLOAT) |
| 2675 | fprintf (file, _(" [VFP float format]")); |
| 2676 | else if (flags & EF_ARM_MAVERICK_FLOAT) |
| 2677 | fprintf (file, _(" [Maverick float format]")); |
| 2678 | else |
| 2679 | fprintf (file, _(" [FPA float format]")); |
| 2680 | |
| 2681 | if (flags & EF_ARM_APCS_FLOAT) |
| 2682 | fprintf (file, _(" [floats passed in float registers]")); |
| 2683 | |
| 2684 | if (flags & EF_ARM_PIC) |
| 2685 | fprintf (file, _(" [position independent]")); |
| 2686 | |
| 2687 | if (flags & EF_ARM_NEW_ABI) |
| 2688 | fprintf (file, _(" [new ABI]")); |
| 2689 | |
| 2690 | if (flags & EF_ARM_OLD_ABI) |
| 2691 | fprintf (file, _(" [old ABI]")); |
| 2692 | |
| 2693 | if (flags & EF_ARM_SOFT_FLOAT) |
| 2694 | fprintf (file, _(" [software FP]")); |
| 2695 | |
| 2696 | flags &= ~(EF_ARM_INTERWORK | EF_ARM_APCS_26 | EF_ARM_APCS_FLOAT |
| 2697 | | EF_ARM_PIC | EF_ARM_NEW_ABI | EF_ARM_OLD_ABI |
| 2698 | | EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT |
| 2699 | | EF_ARM_MAVERICK_FLOAT); |
| 2700 | break; |
| 2701 | |
| 2702 | case EF_ARM_EABI_VER1: |
| 2703 | fprintf (file, _(" [Version1 EABI]")); |
| 2704 | |
| 2705 | if (flags & EF_ARM_SYMSARESORTED) |
| 2706 | fprintf (file, _(" [sorted symbol table]")); |
| 2707 | else |
| 2708 | fprintf (file, _(" [unsorted symbol table]")); |
| 2709 | |
| 2710 | flags &= ~ EF_ARM_SYMSARESORTED; |
| 2711 | break; |
| 2712 | |
| 2713 | case EF_ARM_EABI_VER2: |
| 2714 | fprintf (file, _(" [Version2 EABI]")); |
| 2715 | |
| 2716 | if (flags & EF_ARM_SYMSARESORTED) |
| 2717 | fprintf (file, _(" [sorted symbol table]")); |
| 2718 | else |
| 2719 | fprintf (file, _(" [unsorted symbol table]")); |
| 2720 | |
| 2721 | if (flags & EF_ARM_DYNSYMSUSESEGIDX) |
| 2722 | fprintf (file, _(" [dynamic symbols use segment index]")); |
| 2723 | |
| 2724 | if (flags & EF_ARM_MAPSYMSFIRST) |
| 2725 | fprintf (file, _(" [mapping symbols precede others]")); |
| 2726 | |
| 2727 | flags &= ~(EF_ARM_SYMSARESORTED | EF_ARM_DYNSYMSUSESEGIDX |
| 2728 | | EF_ARM_MAPSYMSFIRST); |
| 2729 | break; |
| 2730 | |
| 2731 | case EF_ARM_EABI_VER3: |
| 2732 | fprintf (file, _(" [Version3 EABI]")); |
| 2733 | |
| 2734 | if (flags & EF_ARM_BE8) |
| 2735 | fprintf (file, _(" [BE8]")); |
| 2736 | |
| 2737 | if (flags & EF_ARM_LE8) |
| 2738 | fprintf (file, _(" [LE8]")); |
| 2739 | |
| 2740 | flags &= ~(EF_ARM_LE8 | EF_ARM_BE8); |
| 2741 | break; |
| 2742 | |
| 2743 | default: |
| 2744 | fprintf (file, _(" <EABI version unrecognised>")); |
| 2745 | break; |
| 2746 | } |
| 2747 | |
| 2748 | flags &= ~ EF_ARM_EABIMASK; |
| 2749 | |
| 2750 | if (flags & EF_ARM_RELEXEC) |
| 2751 | fprintf (file, _(" [relocatable executable]")); |
| 2752 | |
| 2753 | if (flags & EF_ARM_HASENTRY) |
| 2754 | fprintf (file, _(" [has entry point]")); |
| 2755 | |
| 2756 | flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY); |
| 2757 | |
| 2758 | if (flags) |
| 2759 | fprintf (file, _("<Unrecognised flag bits set>")); |
| 2760 | |
| 2761 | fputc ('\n', file); |
| 2762 | |
| 2763 | return TRUE; |
| 2764 | } |
| 2765 | |
| 2766 | static int |
| 2767 | elf32_arm_get_symbol_type (elf_sym, type) |
| 2768 | Elf_Internal_Sym * elf_sym; |
| 2769 | int type; |
| 2770 | { |
| 2771 | switch (ELF_ST_TYPE (elf_sym->st_info)) |
| 2772 | { |
| 2773 | case STT_ARM_TFUNC: |
| 2774 | return ELF_ST_TYPE (elf_sym->st_info); |
| 2775 | |
| 2776 | case STT_ARM_16BIT: |
| 2777 | /* If the symbol is not an object, return the STT_ARM_16BIT flag. |
| 2778 | This allows us to distinguish between data used by Thumb instructions |
| 2779 | and non-data (which is probably code) inside Thumb regions of an |
| 2780 | executable. */ |
| 2781 | if (type != STT_OBJECT) |
| 2782 | return ELF_ST_TYPE (elf_sym->st_info); |
| 2783 | break; |
| 2784 | |
| 2785 | default: |
| 2786 | break; |
| 2787 | } |
| 2788 | |
| 2789 | return type; |
| 2790 | } |
| 2791 | |
| 2792 | static asection * |
| 2793 | elf32_arm_gc_mark_hook (sec, info, rel, h, sym) |
| 2794 | asection *sec; |
| 2795 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 2796 | Elf_Internal_Rela *rel; |
| 2797 | struct elf_link_hash_entry *h; |
| 2798 | Elf_Internal_Sym *sym; |
| 2799 | { |
| 2800 | if (h != NULL) |
| 2801 | { |
| 2802 | switch (ELF32_R_TYPE (rel->r_info)) |
| 2803 | { |
| 2804 | case R_ARM_GNU_VTINHERIT: |
| 2805 | case R_ARM_GNU_VTENTRY: |
| 2806 | break; |
| 2807 | |
| 2808 | default: |
| 2809 | switch (h->root.type) |
| 2810 | { |
| 2811 | case bfd_link_hash_defined: |
| 2812 | case bfd_link_hash_defweak: |
| 2813 | return h->root.u.def.section; |
| 2814 | |
| 2815 | case bfd_link_hash_common: |
| 2816 | return h->root.u.c.p->section; |
| 2817 | |
| 2818 | default: |
| 2819 | break; |
| 2820 | } |
| 2821 | } |
| 2822 | } |
| 2823 | else |
| 2824 | return bfd_section_from_elf_index (sec->owner, sym->st_shndx); |
| 2825 | |
| 2826 | return NULL; |
| 2827 | } |
| 2828 | |
| 2829 | /* Update the got entry reference counts for the section being removed. */ |
| 2830 | |
| 2831 | static bfd_boolean |
| 2832 | elf32_arm_gc_sweep_hook (abfd, info, sec, relocs) |
| 2833 | bfd *abfd ATTRIBUTE_UNUSED; |
| 2834 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 2835 | asection *sec ATTRIBUTE_UNUSED; |
| 2836 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; |
| 2837 | { |
| 2838 | Elf_Internal_Shdr *symtab_hdr; |
| 2839 | struct elf_link_hash_entry **sym_hashes; |
| 2840 | bfd_signed_vma *local_got_refcounts; |
| 2841 | const Elf_Internal_Rela *rel, *relend; |
| 2842 | unsigned long r_symndx; |
| 2843 | struct elf_link_hash_entry *h; |
| 2844 | |
| 2845 | elf_section_data (sec)->local_dynrel = NULL; |
| 2846 | |
| 2847 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2848 | sym_hashes = elf_sym_hashes (abfd); |
| 2849 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 2850 | |
| 2851 | relend = relocs + sec->reloc_count; |
| 2852 | for (rel = relocs; rel < relend; rel++) |
| 2853 | switch (ELF32_R_TYPE (rel->r_info)) |
| 2854 | { |
| 2855 | case R_ARM_GOT32: |
| 2856 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2857 | if (r_symndx >= symtab_hdr->sh_info) |
| 2858 | { |
| 2859 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 2860 | if (h->got.refcount > 0) |
| 2861 | h->got.refcount -= 1; |
| 2862 | } |
| 2863 | else if (local_got_refcounts != NULL) |
| 2864 | { |
| 2865 | if (local_got_refcounts[r_symndx] > 0) |
| 2866 | local_got_refcounts[r_symndx] -= 1; |
| 2867 | } |
| 2868 | break; |
| 2869 | |
| 2870 | case R_ARM_ABS32: |
| 2871 | case R_ARM_REL32: |
| 2872 | case R_ARM_PC24: |
| 2873 | case R_ARM_PLT32: |
| 2874 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2875 | if (r_symndx >= symtab_hdr->sh_info) |
| 2876 | { |
| 2877 | struct elf32_arm_link_hash_entry *eh; |
| 2878 | struct elf32_arm_relocs_copied **pp; |
| 2879 | struct elf32_arm_relocs_copied *p; |
| 2880 | |
| 2881 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 2882 | |
| 2883 | if (h->plt.refcount > 0) |
| 2884 | h->plt.refcount -= 1; |
| 2885 | |
| 2886 | if (ELF32_R_TYPE (rel->r_info) == R_ARM_ABS32 |
| 2887 | || ELF32_R_TYPE (rel->r_info) == R_ARM_REL32) |
| 2888 | { |
| 2889 | eh = (struct elf32_arm_link_hash_entry *) h; |
| 2890 | |
| 2891 | for (pp = &eh->relocs_copied; (p = *pp) != NULL; |
| 2892 | pp = &p->next) |
| 2893 | if (p->section == sec) |
| 2894 | { |
| 2895 | p->count -= 1; |
| 2896 | if (p->count == 0) |
| 2897 | *pp = p->next; |
| 2898 | break; |
| 2899 | } |
| 2900 | } |
| 2901 | } |
| 2902 | break; |
| 2903 | |
| 2904 | default: |
| 2905 | break; |
| 2906 | } |
| 2907 | |
| 2908 | return TRUE; |
| 2909 | } |
| 2910 | |
| 2911 | /* Look through the relocs for a section during the first phase. */ |
| 2912 | |
| 2913 | static bfd_boolean |
| 2914 | elf32_arm_check_relocs (abfd, info, sec, relocs) |
| 2915 | bfd *abfd; |
| 2916 | struct bfd_link_info *info; |
| 2917 | asection *sec; |
| 2918 | const Elf_Internal_Rela *relocs; |
| 2919 | { |
| 2920 | Elf_Internal_Shdr *symtab_hdr; |
| 2921 | struct elf_link_hash_entry **sym_hashes; |
| 2922 | struct elf_link_hash_entry **sym_hashes_end; |
| 2923 | const Elf_Internal_Rela *rel; |
| 2924 | const Elf_Internal_Rela *rel_end; |
| 2925 | bfd *dynobj; |
| 2926 | asection *sreloc; |
| 2927 | bfd_vma *local_got_offsets; |
| 2928 | struct elf32_arm_link_hash_table *htab; |
| 2929 | |
| 2930 | if (info->relocatable) |
| 2931 | return TRUE; |
| 2932 | |
| 2933 | htab = elf32_arm_hash_table (info); |
| 2934 | sreloc = NULL; |
| 2935 | |
| 2936 | dynobj = elf_hash_table (info)->dynobj; |
| 2937 | local_got_offsets = elf_local_got_offsets (abfd); |
| 2938 | |
| 2939 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2940 | sym_hashes = elf_sym_hashes (abfd); |
| 2941 | sym_hashes_end = sym_hashes |
| 2942 | + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); |
| 2943 | |
| 2944 | if (!elf_bad_symtab (abfd)) |
| 2945 | sym_hashes_end -= symtab_hdr->sh_info; |
| 2946 | |
| 2947 | rel_end = relocs + sec->reloc_count; |
| 2948 | for (rel = relocs; rel < rel_end; rel++) |
| 2949 | { |
| 2950 | struct elf_link_hash_entry *h; |
| 2951 | unsigned long r_symndx; |
| 2952 | |
| 2953 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2954 | if (r_symndx < symtab_hdr->sh_info) |
| 2955 | h = NULL; |
| 2956 | else |
| 2957 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 2958 | |
| 2959 | switch (ELF32_R_TYPE (rel->r_info)) |
| 2960 | { |
| 2961 | case R_ARM_GOT32: |
| 2962 | /* This symbol requires a global offset table entry. */ |
| 2963 | if (h != NULL) |
| 2964 | { |
| 2965 | h->got.refcount++; |
| 2966 | } |
| 2967 | else |
| 2968 | { |
| 2969 | bfd_signed_vma *local_got_refcounts; |
| 2970 | |
| 2971 | /* This is a global offset table entry for a local symbol. */ |
| 2972 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 2973 | if (local_got_refcounts == NULL) |
| 2974 | { |
| 2975 | bfd_size_type size; |
| 2976 | |
| 2977 | size = symtab_hdr->sh_info; |
| 2978 | size *= (sizeof (bfd_signed_vma) + sizeof(char)); |
| 2979 | local_got_refcounts = ((bfd_signed_vma *) |
| 2980 | bfd_zalloc (abfd, size)); |
| 2981 | if (local_got_refcounts == NULL) |
| 2982 | return FALSE; |
| 2983 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 2984 | } |
| 2985 | local_got_refcounts[r_symndx] += 1; |
| 2986 | } |
| 2987 | break; |
| 2988 | |
| 2989 | case R_ARM_GOTOFF: |
| 2990 | case R_ARM_GOTPC: |
| 2991 | if (htab->sgot == NULL) |
| 2992 | { |
| 2993 | if (htab->root.dynobj == NULL) |
| 2994 | htab->root.dynobj = abfd; |
| 2995 | if (!create_got_section (htab->root.dynobj, info)) |
| 2996 | return FALSE; |
| 2997 | } |
| 2998 | break; |
| 2999 | |
| 3000 | case R_ARM_ABS32: |
| 3001 | case R_ARM_REL32: |
| 3002 | case R_ARM_PC24: |
| 3003 | case R_ARM_PLT32: |
| 3004 | if (h != NULL) |
| 3005 | { |
| 3006 | /* If this reloc is in a read-only section, we might |
| 3007 | need a copy reloc. We can't check reliably at this |
| 3008 | stage whether the section is read-only, as input |
| 3009 | sections have not yet been mapped to output sections. |
| 3010 | Tentatively set the flag for now, and correct in |
| 3011 | adjust_dynamic_symbol. */ |
| 3012 | if (!info->shared) |
| 3013 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; |
| 3014 | |
| 3015 | /* We may need a .plt entry if the function this reloc |
| 3016 | refers to is in a different object. We can't tell for |
| 3017 | sure yet, because something later might force the |
| 3018 | symbol local. */ |
| 3019 | if (ELF32_R_TYPE (rel->r_info) == R_ARM_PC24 |
| 3020 | || ELF32_R_TYPE (rel->r_info) == R_ARM_PLT32) |
| 3021 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| 3022 | |
| 3023 | /* If we create a PLT entry, this relocation will reference |
| 3024 | it, even if it's an ABS32 relocation. */ |
| 3025 | h->plt.refcount += 1; |
| 3026 | } |
| 3027 | |
| 3028 | /* If we are creating a shared library, and this is a reloc |
| 3029 | against a global symbol, or a non PC relative reloc |
| 3030 | against a local symbol, then we need to copy the reloc |
| 3031 | into the shared library. However, if we are linking with |
| 3032 | -Bsymbolic, we do not need to copy a reloc against a |
| 3033 | global symbol which is defined in an object we are |
| 3034 | including in the link (i.e., DEF_REGULAR is set). At |
| 3035 | this point we have not seen all the input files, so it is |
| 3036 | possible that DEF_REGULAR is not set now but will be set |
| 3037 | later (it is never cleared). We account for that |
| 3038 | possibility below by storing information in the |
| 3039 | relocs_copied field of the hash table entry. */ |
| 3040 | if (info->shared |
| 3041 | && (sec->flags & SEC_ALLOC) != 0 |
| 3042 | && ((ELF32_R_TYPE (rel->r_info) != R_ARM_PC24 |
| 3043 | && ELF32_R_TYPE (rel->r_info) != R_ARM_PLT32 |
| 3044 | && ELF32_R_TYPE (rel->r_info) != R_ARM_REL32) |
| 3045 | || (h != NULL |
| 3046 | && (! info->symbolic |
| 3047 | || (h->elf_link_hash_flags |
| 3048 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 3049 | { |
| 3050 | struct elf32_arm_relocs_copied *p, **head; |
| 3051 | |
| 3052 | /* When creating a shared object, we must copy these |
| 3053 | reloc types into the output file. We create a reloc |
| 3054 | section in dynobj and make room for this reloc. */ |
| 3055 | if (sreloc == NULL) |
| 3056 | { |
| 3057 | const char * name; |
| 3058 | |
| 3059 | name = (bfd_elf_string_from_elf_section |
| 3060 | (abfd, |
| 3061 | elf_elfheader (abfd)->e_shstrndx, |
| 3062 | elf_section_data (sec)->rel_hdr.sh_name)); |
| 3063 | if (name == NULL) |
| 3064 | return FALSE; |
| 3065 | |
| 3066 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 |
| 3067 | && strcmp (bfd_get_section_name (abfd, sec), |
| 3068 | name + 4) == 0); |
| 3069 | |
| 3070 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 3071 | if (sreloc == NULL) |
| 3072 | { |
| 3073 | flagword flags; |
| 3074 | |
| 3075 | sreloc = bfd_make_section (dynobj, name); |
| 3076 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 3077 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 3078 | if ((sec->flags & SEC_ALLOC) != 0) |
| 3079 | flags |= SEC_ALLOC | SEC_LOAD; |
| 3080 | if (sreloc == NULL |
| 3081 | || ! bfd_set_section_flags (dynobj, sreloc, flags) |
| 3082 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
| 3083 | return FALSE; |
| 3084 | } |
| 3085 | |
| 3086 | elf_section_data (sec)->sreloc = sreloc; |
| 3087 | } |
| 3088 | |
| 3089 | /* If this is a global symbol, we count the number of |
| 3090 | relocations we need for this symbol. */ |
| 3091 | if (h != NULL) |
| 3092 | { |
| 3093 | head = &((struct elf32_arm_link_hash_entry *) h)->relocs_copied; |
| 3094 | } |
| 3095 | else |
| 3096 | { |
| 3097 | /* Track dynamic relocs needed for local syms too. |
| 3098 | We really need local syms available to do this |
| 3099 | easily. Oh well. */ |
| 3100 | |
| 3101 | asection *s; |
| 3102 | s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, |
| 3103 | sec, r_symndx); |
| 3104 | if (s == NULL) |
| 3105 | return FALSE; |
| 3106 | |
| 3107 | head = ((struct elf32_arm_relocs_copied **) |
| 3108 | &elf_section_data (s)->local_dynrel); |
| 3109 | } |
| 3110 | |
| 3111 | p = *head; |
| 3112 | if (p == NULL || p->section != sec) |
| 3113 | { |
| 3114 | bfd_size_type amt = sizeof *p; |
| 3115 | p = bfd_alloc (htab->root.dynobj, amt); |
| 3116 | if (p == NULL) |
| 3117 | return FALSE; |
| 3118 | p->next = *head; |
| 3119 | *head = p; |
| 3120 | p->section = sec; |
| 3121 | p->count = 0; |
| 3122 | } |
| 3123 | |
| 3124 | if (ELF32_R_TYPE (rel->r_info) == R_ARM_ABS32 |
| 3125 | || ELF32_R_TYPE (rel->r_info) == R_ARM_REL32) |
| 3126 | p->count += 1; |
| 3127 | } |
| 3128 | break; |
| 3129 | |
| 3130 | /* This relocation describes the C++ object vtable hierarchy. |
| 3131 | Reconstruct it for later use during GC. */ |
| 3132 | case R_ARM_GNU_VTINHERIT: |
| 3133 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 3134 | return FALSE; |
| 3135 | break; |
| 3136 | |
| 3137 | /* This relocation describes which C++ vtable entries are actually |
| 3138 | used. Record for later use during GC. */ |
| 3139 | case R_ARM_GNU_VTENTRY: |
| 3140 | if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
| 3141 | return FALSE; |
| 3142 | break; |
| 3143 | } |
| 3144 | } |
| 3145 | |
| 3146 | return TRUE; |
| 3147 | } |
| 3148 | |
| 3149 | /* Find the nearest line to a particular section and offset, for error |
| 3150 | reporting. This code is a duplicate of the code in elf.c, except |
| 3151 | that it also accepts STT_ARM_TFUNC as a symbol that names a function. */ |
| 3152 | |
| 3153 | static bfd_boolean |
| 3154 | elf32_arm_find_nearest_line |
| 3155 | (abfd, section, symbols, offset, filename_ptr, functionname_ptr, line_ptr) |
| 3156 | bfd *abfd; |
| 3157 | asection *section; |
| 3158 | asymbol **symbols; |
| 3159 | bfd_vma offset; |
| 3160 | const char **filename_ptr; |
| 3161 | const char **functionname_ptr; |
| 3162 | unsigned int *line_ptr; |
| 3163 | { |
| 3164 | bfd_boolean found; |
| 3165 | const char *filename; |
| 3166 | asymbol *func; |
| 3167 | bfd_vma low_func; |
| 3168 | asymbol **p; |
| 3169 | |
| 3170 | if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset, |
| 3171 | filename_ptr, functionname_ptr, |
| 3172 | line_ptr, 0, |
| 3173 | &elf_tdata (abfd)->dwarf2_find_line_info)) |
| 3174 | return TRUE; |
| 3175 | |
| 3176 | if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, |
| 3177 | &found, filename_ptr, |
| 3178 | functionname_ptr, line_ptr, |
| 3179 | &elf_tdata (abfd)->line_info)) |
| 3180 | return FALSE; |
| 3181 | |
| 3182 | if (found) |
| 3183 | return TRUE; |
| 3184 | |
| 3185 | if (symbols == NULL) |
| 3186 | return FALSE; |
| 3187 | |
| 3188 | filename = NULL; |
| 3189 | func = NULL; |
| 3190 | low_func = 0; |
| 3191 | |
| 3192 | for (p = symbols; *p != NULL; p++) |
| 3193 | { |
| 3194 | elf_symbol_type *q; |
| 3195 | |
| 3196 | q = (elf_symbol_type *) *p; |
| 3197 | |
| 3198 | if (bfd_get_section (&q->symbol) != section) |
| 3199 | continue; |
| 3200 | |
| 3201 | switch (ELF_ST_TYPE (q->internal_elf_sym.st_info)) |
| 3202 | { |
| 3203 | default: |
| 3204 | break; |
| 3205 | case STT_FILE: |
| 3206 | filename = bfd_asymbol_name (&q->symbol); |
| 3207 | break; |
| 3208 | case STT_NOTYPE: |
| 3209 | case STT_FUNC: |
| 3210 | case STT_ARM_TFUNC: |
| 3211 | if (q->symbol.section == section |
| 3212 | && q->symbol.value >= low_func |
| 3213 | && q->symbol.value <= offset) |
| 3214 | { |
| 3215 | func = (asymbol *) q; |
| 3216 | low_func = q->symbol.value; |
| 3217 | } |
| 3218 | break; |
| 3219 | } |
| 3220 | } |
| 3221 | |
| 3222 | if (func == NULL) |
| 3223 | return FALSE; |
| 3224 | |
| 3225 | *filename_ptr = filename; |
| 3226 | *functionname_ptr = bfd_asymbol_name (func); |
| 3227 | *line_ptr = 0; |
| 3228 | |
| 3229 | return TRUE; |
| 3230 | } |
| 3231 | |
| 3232 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 3233 | regular object. The current definition is in some section of the |
| 3234 | dynamic object, but we're not including those sections. We have to |
| 3235 | change the definition to something the rest of the link can |
| 3236 | understand. */ |
| 3237 | |
| 3238 | static bfd_boolean |
| 3239 | elf32_arm_adjust_dynamic_symbol (info, h) |
| 3240 | struct bfd_link_info * info; |
| 3241 | struct elf_link_hash_entry * h; |
| 3242 | { |
| 3243 | bfd * dynobj; |
| 3244 | asection * s; |
| 3245 | unsigned int power_of_two; |
| 3246 | |
| 3247 | dynobj = elf_hash_table (info)->dynobj; |
| 3248 | |
| 3249 | /* Make sure we know what is going on here. */ |
| 3250 | BFD_ASSERT (dynobj != NULL |
| 3251 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) |
| 3252 | || h->weakdef != NULL |
| 3253 | || ((h->elf_link_hash_flags |
| 3254 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 3255 | && (h->elf_link_hash_flags |
| 3256 | & ELF_LINK_HASH_REF_REGULAR) != 0 |
| 3257 | && (h->elf_link_hash_flags |
| 3258 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); |
| 3259 | |
| 3260 | /* If this is a function, put it in the procedure linkage table. We |
| 3261 | will fill in the contents of the procedure linkage table later, |
| 3262 | when we know the address of the .got section. */ |
| 3263 | if (h->type == STT_FUNC |
| 3264 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) |
| 3265 | { |
| 3266 | if (h->plt.refcount <= 0 |
| 3267 | || SYMBOL_CALLS_LOCAL (info, h) |
| 3268 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 3269 | && h->root.type == bfd_link_hash_undefweak)) |
| 3270 | { |
| 3271 | /* This case can occur if we saw a PLT32 reloc in an input |
| 3272 | file, but the symbol was never referred to by a dynamic |
| 3273 | object, or if all references were garbage collected. In |
| 3274 | such a case, we don't actually need to build a procedure |
| 3275 | linkage table, and we can just do a PC24 reloc instead. */ |
| 3276 | h->plt.offset = (bfd_vma) -1; |
| 3277 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 3278 | } |
| 3279 | |
| 3280 | return TRUE; |
| 3281 | } |
| 3282 | else |
| 3283 | /* It's possible that we incorrectly decided a .plt reloc was |
| 3284 | needed for an R_ARM_PC24 reloc to a non-function sym in |
| 3285 | check_relocs. We can't decide accurately between function and |
| 3286 | non-function syms in check-relocs; Objects loaded later in |
| 3287 | the link may change h->type. So fix it now. */ |
| 3288 | h->plt.offset = (bfd_vma) -1; |
| 3289 | |
| 3290 | /* If this is a weak symbol, and there is a real definition, the |
| 3291 | processor independent code will have arranged for us to see the |
| 3292 | real definition first, and we can just use the same value. */ |
| 3293 | if (h->weakdef != NULL) |
| 3294 | { |
| 3295 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| 3296 | || h->weakdef->root.type == bfd_link_hash_defweak); |
| 3297 | h->root.u.def.section = h->weakdef->root.u.def.section; |
| 3298 | h->root.u.def.value = h->weakdef->root.u.def.value; |
| 3299 | return TRUE; |
| 3300 | } |
| 3301 | |
| 3302 | /* This is a reference to a symbol defined by a dynamic object which |
| 3303 | is not a function. */ |
| 3304 | |
| 3305 | /* If we are creating a shared library, we must presume that the |
| 3306 | only references to the symbol are via the global offset table. |
| 3307 | For such cases we need not do anything here; the relocations will |
| 3308 | be handled correctly by relocate_section. */ |
| 3309 | if (info->shared) |
| 3310 | return TRUE; |
| 3311 | |
| 3312 | /* We must allocate the symbol in our .dynbss section, which will |
| 3313 | become part of the .bss section of the executable. There will be |
| 3314 | an entry for this symbol in the .dynsym section. The dynamic |
| 3315 | object will contain position independent code, so all references |
| 3316 | from the dynamic object to this symbol will go through the global |
| 3317 | offset table. The dynamic linker will use the .dynsym entry to |
| 3318 | determine the address it must put in the global offset table, so |
| 3319 | both the dynamic object and the regular object will refer to the |
| 3320 | same memory location for the variable. */ |
| 3321 | s = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 3322 | BFD_ASSERT (s != NULL); |
| 3323 | |
| 3324 | /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to |
| 3325 | copy the initial value out of the dynamic object and into the |
| 3326 | runtime process image. We need to remember the offset into the |
| 3327 | .rel.bss section we are going to use. */ |
| 3328 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 3329 | { |
| 3330 | asection *srel; |
| 3331 | |
| 3332 | srel = bfd_get_section_by_name (dynobj, ".rel.bss"); |
| 3333 | BFD_ASSERT (srel != NULL); |
| 3334 | srel->_raw_size += sizeof (Elf32_External_Rel); |
| 3335 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
| 3336 | } |
| 3337 | |
| 3338 | /* We need to figure out the alignment required for this symbol. I |
| 3339 | have no idea how ELF linkers handle this. */ |
| 3340 | power_of_two = bfd_log2 (h->size); |
| 3341 | if (power_of_two > 3) |
| 3342 | power_of_two = 3; |
| 3343 | |
| 3344 | /* Apply the required alignment. */ |
| 3345 | s->_raw_size = BFD_ALIGN (s->_raw_size, |
| 3346 | (bfd_size_type) (1 << power_of_two)); |
| 3347 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) |
| 3348 | { |
| 3349 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) |
| 3350 | return FALSE; |
| 3351 | } |
| 3352 | |
| 3353 | /* Define the symbol as being at this point in the section. */ |
| 3354 | h->root.u.def.section = s; |
| 3355 | h->root.u.def.value = s->_raw_size; |
| 3356 | |
| 3357 | /* Increment the section size to make room for the symbol. */ |
| 3358 | s->_raw_size += h->size; |
| 3359 | |
| 3360 | return TRUE; |
| 3361 | } |
| 3362 | |
| 3363 | /* Allocate space in .plt, .got and associated reloc sections for |
| 3364 | dynamic relocs. */ |
| 3365 | |
| 3366 | static bfd_boolean |
| 3367 | allocate_dynrelocs (h, inf) |
| 3368 | struct elf_link_hash_entry *h; |
| 3369 | PTR inf; |
| 3370 | { |
| 3371 | struct bfd_link_info *info; |
| 3372 | struct elf32_arm_link_hash_table *htab; |
| 3373 | struct elf32_arm_link_hash_entry *eh; |
| 3374 | struct elf32_arm_relocs_copied *p; |
| 3375 | |
| 3376 | if (h->root.type == bfd_link_hash_indirect) |
| 3377 | return TRUE; |
| 3378 | |
| 3379 | if (h->root.type == bfd_link_hash_warning) |
| 3380 | /* When warning symbols are created, they **replace** the "real" |
| 3381 | entry in the hash table, thus we never get to see the real |
| 3382 | symbol in a hash traversal. So look at it now. */ |
| 3383 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 3384 | |
| 3385 | info = (struct bfd_link_info *) inf; |
| 3386 | htab = elf32_arm_hash_table (info); |
| 3387 | |
| 3388 | if (htab->root.dynamic_sections_created |
| 3389 | && h->plt.refcount > 0) |
| 3390 | { |
| 3391 | /* Make sure this symbol is output as a dynamic symbol. |
| 3392 | Undefined weak syms won't yet be marked as dynamic. */ |
| 3393 | if (h->dynindx == -1 |
| 3394 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 3395 | { |
| 3396 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 3397 | return FALSE; |
| 3398 | } |
| 3399 | |
| 3400 | if (info->shared |
| 3401 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) |
| 3402 | { |
| 3403 | asection *s = htab->splt; |
| 3404 | |
| 3405 | /* If this is the first .plt entry, make room for the special |
| 3406 | first entry. */ |
| 3407 | if (s->_raw_size == 0) |
| 3408 | s->_raw_size += PLT_HEADER_SIZE; |
| 3409 | |
| 3410 | h->plt.offset = s->_raw_size; |
| 3411 | |
| 3412 | /* If this symbol is not defined in a regular file, and we are |
| 3413 | not generating a shared library, then set the symbol to this |
| 3414 | location in the .plt. This is required to make function |
| 3415 | pointers compare as equal between the normal executable and |
| 3416 | the shared library. */ |
| 3417 | if (! info->shared |
| 3418 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 3419 | { |
| 3420 | h->root.u.def.section = s; |
| 3421 | h->root.u.def.value = h->plt.offset; |
| 3422 | } |
| 3423 | |
| 3424 | /* Make room for this entry. */ |
| 3425 | s->_raw_size += PLT_ENTRY_SIZE; |
| 3426 | |
| 3427 | /* We also need to make an entry in the .got.plt section, which |
| 3428 | will be placed in the .got section by the linker script. */ |
| 3429 | htab->sgotplt->_raw_size += 4; |
| 3430 | |
| 3431 | /* We also need to make an entry in the .rel.plt section. */ |
| 3432 | htab->srelplt->_raw_size += sizeof (Elf32_External_Rel); |
| 3433 | } |
| 3434 | else |
| 3435 | { |
| 3436 | h->plt.offset = (bfd_vma) -1; |
| 3437 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 3438 | } |
| 3439 | } |
| 3440 | else |
| 3441 | { |
| 3442 | h->plt.offset = (bfd_vma) -1; |
| 3443 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 3444 | } |
| 3445 | |
| 3446 | if (h->got.refcount > 0) |
| 3447 | { |
| 3448 | asection *s; |
| 3449 | bfd_boolean dyn; |
| 3450 | |
| 3451 | /* Make sure this symbol is output as a dynamic symbol. |
| 3452 | Undefined weak syms won't yet be marked as dynamic. */ |
| 3453 | if (h->dynindx == -1 |
| 3454 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 3455 | { |
| 3456 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 3457 | return FALSE; |
| 3458 | } |
| 3459 | |
| 3460 | s = htab->sgot; |
| 3461 | h->got.offset = s->_raw_size; |
| 3462 | s->_raw_size += 4; |
| 3463 | dyn = htab->root.dynamic_sections_created; |
| 3464 | if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 3465 | || h->root.type != bfd_link_hash_undefweak) |
| 3466 | && (info->shared |
| 3467 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) |
| 3468 | htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); |
| 3469 | } |
| 3470 | else |
| 3471 | h->got.offset = (bfd_vma) -1; |
| 3472 | |
| 3473 | eh = (struct elf32_arm_link_hash_entry *) h; |
| 3474 | if (eh->relocs_copied == NULL) |
| 3475 | return TRUE; |
| 3476 | |
| 3477 | /* In the shared -Bsymbolic case, discard space allocated for |
| 3478 | dynamic pc-relative relocs against symbols which turn out to be |
| 3479 | defined in regular objects. For the normal shared case, discard |
| 3480 | space for pc-relative relocs that have become local due to symbol |
| 3481 | visibility changes. */ |
| 3482 | |
| 3483 | if (info->shared) |
| 3484 | { |
| 3485 | /* Discard relocs on undefined weak syms with non-default |
| 3486 | visibility. */ |
| 3487 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 3488 | && h->root.type == bfd_link_hash_undefweak) |
| 3489 | eh->relocs_copied = NULL; |
| 3490 | } |
| 3491 | else |
| 3492 | { |
| 3493 | /* For the non-shared case, discard space for relocs against |
| 3494 | symbols which turn out to need copy relocs or are not |
| 3495 | dynamic. */ |
| 3496 | |
| 3497 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 3498 | && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 3499 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 3500 | || (htab->root.dynamic_sections_created |
| 3501 | && (h->root.type == bfd_link_hash_undefweak |
| 3502 | || h->root.type == bfd_link_hash_undefined)))) |
| 3503 | { |
| 3504 | /* Make sure this symbol is output as a dynamic symbol. |
| 3505 | Undefined weak syms won't yet be marked as dynamic. */ |
| 3506 | if (h->dynindx == -1 |
| 3507 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 3508 | { |
| 3509 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 3510 | return FALSE; |
| 3511 | } |
| 3512 | |
| 3513 | /* If that succeeded, we know we'll be keeping all the |
| 3514 | relocs. */ |
| 3515 | if (h->dynindx != -1) |
| 3516 | goto keep; |
| 3517 | } |
| 3518 | |
| 3519 | eh->relocs_copied = NULL; |
| 3520 | |
| 3521 | keep: ; |
| 3522 | } |
| 3523 | |
| 3524 | /* Finally, allocate space. */ |
| 3525 | for (p = eh->relocs_copied; p != NULL; p = p->next) |
| 3526 | { |
| 3527 | asection *sreloc = elf_section_data (p->section)->sreloc; |
| 3528 | sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel); |
| 3529 | } |
| 3530 | |
| 3531 | return TRUE; |
| 3532 | } |
| 3533 | |
| 3534 | /* Set the sizes of the dynamic sections. */ |
| 3535 | |
| 3536 | static bfd_boolean |
| 3537 | elf32_arm_size_dynamic_sections (output_bfd, info) |
| 3538 | bfd * output_bfd ATTRIBUTE_UNUSED; |
| 3539 | struct bfd_link_info * info; |
| 3540 | { |
| 3541 | bfd * dynobj; |
| 3542 | asection * s; |
| 3543 | bfd_boolean plt; |
| 3544 | bfd_boolean relocs; |
| 3545 | bfd *ibfd; |
| 3546 | struct elf32_arm_link_hash_table *htab; |
| 3547 | |
| 3548 | htab = elf32_arm_hash_table (info); |
| 3549 | dynobj = elf_hash_table (info)->dynobj; |
| 3550 | BFD_ASSERT (dynobj != NULL); |
| 3551 | |
| 3552 | if (elf_hash_table (info)->dynamic_sections_created) |
| 3553 | { |
| 3554 | /* Set the contents of the .interp section to the interpreter. */ |
| 3555 | if (info->executable) |
| 3556 | { |
| 3557 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 3558 | BFD_ASSERT (s != NULL); |
| 3559 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 3560 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 3561 | } |
| 3562 | } |
| 3563 | |
| 3564 | /* Set up .got offsets for local syms, and space for local dynamic |
| 3565 | relocs. */ |
| 3566 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 3567 | { |
| 3568 | bfd_signed_vma *local_got; |
| 3569 | bfd_signed_vma *end_local_got; |
| 3570 | char *local_tls_type; |
| 3571 | bfd_size_type locsymcount; |
| 3572 | Elf_Internal_Shdr *symtab_hdr; |
| 3573 | asection *srel; |
| 3574 | |
| 3575 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| 3576 | continue; |
| 3577 | |
| 3578 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 3579 | { |
| 3580 | struct elf32_arm_relocs_copied *p; |
| 3581 | |
| 3582 | for (p = *((struct elf32_arm_relocs_copied **) |
| 3583 | &elf_section_data (s)->local_dynrel); |
| 3584 | p != NULL; |
| 3585 | p = p->next) |
| 3586 | { |
| 3587 | if (!bfd_is_abs_section (p->section) |
| 3588 | && bfd_is_abs_section (p->section->output_section)) |
| 3589 | { |
| 3590 | /* Input section has been discarded, either because |
| 3591 | it is a copy of a linkonce section or due to |
| 3592 | linker script /DISCARD/, so we'll be discarding |
| 3593 | the relocs too. */ |
| 3594 | } |
| 3595 | else if (p->count != 0) |
| 3596 | { |
| 3597 | srel = elf_section_data (p->section)->sreloc; |
| 3598 | srel->_raw_size += p->count * sizeof (Elf32_External_Rel); |
| 3599 | if ((p->section->output_section->flags & SEC_READONLY) != 0) |
| 3600 | info->flags |= DF_TEXTREL; |
| 3601 | } |
| 3602 | } |
| 3603 | } |
| 3604 | |
| 3605 | local_got = elf_local_got_refcounts (ibfd); |
| 3606 | if (!local_got) |
| 3607 | continue; |
| 3608 | |
| 3609 | symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; |
| 3610 | locsymcount = symtab_hdr->sh_info; |
| 3611 | end_local_got = local_got + locsymcount; |
| 3612 | s = htab->sgot; |
| 3613 | srel = htab->srelgot; |
| 3614 | for (; local_got < end_local_got; ++local_got, ++local_tls_type) |
| 3615 | { |
| 3616 | if (*local_got > 0) |
| 3617 | { |
| 3618 | *local_got = s->_raw_size; |
| 3619 | s->_raw_size += 4; |
| 3620 | if (info->shared) |
| 3621 | srel->_raw_size += sizeof (Elf32_External_Rel); |
| 3622 | } |
| 3623 | else |
| 3624 | *local_got = (bfd_vma) -1; |
| 3625 | } |
| 3626 | } |
| 3627 | |
| 3628 | /* Allocate global sym .plt and .got entries, and space for global |
| 3629 | sym dynamic relocs. */ |
| 3630 | elf_link_hash_traverse (&htab->root, allocate_dynrelocs, (PTR) info); |
| 3631 | |
| 3632 | /* The check_relocs and adjust_dynamic_symbol entry points have |
| 3633 | determined the sizes of the various dynamic sections. Allocate |
| 3634 | memory for them. */ |
| 3635 | plt = FALSE; |
| 3636 | relocs = FALSE; |
| 3637 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 3638 | { |
| 3639 | const char * name; |
| 3640 | bfd_boolean strip; |
| 3641 | |
| 3642 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 3643 | continue; |
| 3644 | |
| 3645 | /* It's OK to base decisions on the section name, because none |
| 3646 | of the dynobj section names depend upon the input files. */ |
| 3647 | name = bfd_get_section_name (dynobj, s); |
| 3648 | |
| 3649 | strip = FALSE; |
| 3650 | |
| 3651 | if (strcmp (name, ".plt") == 0) |
| 3652 | { |
| 3653 | if (s->_raw_size == 0) |
| 3654 | { |
| 3655 | /* Strip this section if we don't need it; see the |
| 3656 | comment below. */ |
| 3657 | strip = TRUE; |
| 3658 | } |
| 3659 | else |
| 3660 | { |
| 3661 | /* Remember whether there is a PLT. */ |
| 3662 | plt = TRUE; |
| 3663 | } |
| 3664 | } |
| 3665 | else if (strncmp (name, ".rel", 4) == 0) |
| 3666 | { |
| 3667 | if (s->_raw_size == 0) |
| 3668 | { |
| 3669 | /* If we don't need this section, strip it from the |
| 3670 | output file. This is mostly to handle .rel.bss and |
| 3671 | .rel.plt. We must create both sections in |
| 3672 | create_dynamic_sections, because they must be created |
| 3673 | before the linker maps input sections to output |
| 3674 | sections. The linker does that before |
| 3675 | adjust_dynamic_symbol is called, and it is that |
| 3676 | function which decides whether anything needs to go |
| 3677 | into these sections. */ |
| 3678 | strip = TRUE; |
| 3679 | } |
| 3680 | else |
| 3681 | { |
| 3682 | /* Remember whether there are any reloc sections other |
| 3683 | than .rel.plt. */ |
| 3684 | if (strcmp (name, ".rel.plt") != 0) |
| 3685 | relocs = TRUE; |
| 3686 | |
| 3687 | /* We use the reloc_count field as a counter if we need |
| 3688 | to copy relocs into the output file. */ |
| 3689 | s->reloc_count = 0; |
| 3690 | } |
| 3691 | } |
| 3692 | else if (strncmp (name, ".got", 4) != 0) |
| 3693 | { |
| 3694 | /* It's not one of our sections, so don't allocate space. */ |
| 3695 | continue; |
| 3696 | } |
| 3697 | |
| 3698 | if (strip) |
| 3699 | { |
| 3700 | _bfd_strip_section_from_output (info, s); |
| 3701 | continue; |
| 3702 | } |
| 3703 | |
| 3704 | /* Allocate memory for the section contents. */ |
| 3705 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); |
| 3706 | if (s->contents == NULL && s->_raw_size != 0) |
| 3707 | return FALSE; |
| 3708 | } |
| 3709 | |
| 3710 | if (elf_hash_table (info)->dynamic_sections_created) |
| 3711 | { |
| 3712 | /* Add some entries to the .dynamic section. We fill in the |
| 3713 | values later, in elf32_arm_finish_dynamic_sections, but we |
| 3714 | must add the entries now so that we get the correct size for |
| 3715 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 3716 | dynamic linker and used by the debugger. */ |
| 3717 | #define add_dynamic_entry(TAG, VAL) \ |
| 3718 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| 3719 | |
| 3720 | if (!info->shared) |
| 3721 | { |
| 3722 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 3723 | return FALSE; |
| 3724 | } |
| 3725 | |
| 3726 | if (plt) |
| 3727 | { |
| 3728 | if ( !add_dynamic_entry (DT_PLTGOT, 0) |
| 3729 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 3730 | || !add_dynamic_entry (DT_PLTREL, DT_REL) |
| 3731 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 3732 | return FALSE; |
| 3733 | } |
| 3734 | |
| 3735 | if (relocs) |
| 3736 | { |
| 3737 | if ( !add_dynamic_entry (DT_REL, 0) |
| 3738 | || !add_dynamic_entry (DT_RELSZ, 0) |
| 3739 | || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) |
| 3740 | return FALSE; |
| 3741 | } |
| 3742 | |
| 3743 | if ((info->flags & DF_TEXTREL) != 0) |
| 3744 | { |
| 3745 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 3746 | return FALSE; |
| 3747 | info->flags |= DF_TEXTREL; |
| 3748 | } |
| 3749 | } |
| 3750 | #undef add_synamic_entry |
| 3751 | |
| 3752 | return TRUE; |
| 3753 | } |
| 3754 | |
| 3755 | /* Finish up dynamic symbol handling. We set the contents of various |
| 3756 | dynamic sections here. */ |
| 3757 | |
| 3758 | static bfd_boolean |
| 3759 | elf32_arm_finish_dynamic_symbol (output_bfd, info, h, sym) |
| 3760 | bfd * output_bfd; |
| 3761 | struct bfd_link_info * info; |
| 3762 | struct elf_link_hash_entry * h; |
| 3763 | Elf_Internal_Sym * sym; |
| 3764 | { |
| 3765 | bfd * dynobj; |
| 3766 | |
| 3767 | dynobj = elf_hash_table (info)->dynobj; |
| 3768 | |
| 3769 | if (h->plt.offset != (bfd_vma) -1) |
| 3770 | { |
| 3771 | asection * splt; |
| 3772 | asection * sgot; |
| 3773 | asection * srel; |
| 3774 | bfd_vma plt_index; |
| 3775 | bfd_vma got_offset; |
| 3776 | Elf_Internal_Rela rel; |
| 3777 | bfd_byte *loc; |
| 3778 | bfd_vma got_displacement; |
| 3779 | |
| 3780 | /* This symbol has an entry in the procedure linkage table. Set |
| 3781 | it up. */ |
| 3782 | |
| 3783 | BFD_ASSERT (h->dynindx != -1); |
| 3784 | |
| 3785 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 3786 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 3787 | srel = bfd_get_section_by_name (dynobj, ".rel.plt"); |
| 3788 | BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); |
| 3789 | |
| 3790 | /* Get the index in the procedure linkage table which |
| 3791 | corresponds to this symbol. This is the index of this symbol |
| 3792 | in all the symbols for which we are making plt entries. The |
| 3793 | first entry in the procedure linkage table is reserved. */ |
| 3794 | plt_index = (h->plt.offset - PLT_HEADER_SIZE) / PLT_ENTRY_SIZE; |
| 3795 | |
| 3796 | /* Get the offset into the .got table of the entry that |
| 3797 | corresponds to this function. Each .got entry is 4 bytes. |
| 3798 | The first three are reserved. */ |
| 3799 | got_offset = (plt_index + 3) * 4; |
| 3800 | |
| 3801 | /* Calculate the displacement between the PLT slot and the |
| 3802 | entry in the GOT. */ |
| 3803 | got_displacement = (sgot->output_section->vma |
| 3804 | + sgot->output_offset |
| 3805 | + got_offset |
| 3806 | - splt->output_section->vma |
| 3807 | - splt->output_offset |
| 3808 | - h->plt.offset |
| 3809 | - 8); |
| 3810 | |
| 3811 | BFD_ASSERT ((got_displacement & 0xf0000000) == 0); |
| 3812 | |
| 3813 | /* Fill in the entry in the procedure linkage table. */ |
| 3814 | bfd_put_32 (output_bfd, elf32_arm_plt_entry[0] | ((got_displacement & 0x0ff00000) >> 20), |
| 3815 | splt->contents + h->plt.offset + 0); |
| 3816 | bfd_put_32 (output_bfd, elf32_arm_plt_entry[1] | ((got_displacement & 0x000ff000) >> 12), |
| 3817 | splt->contents + h->plt.offset + 4); |
| 3818 | bfd_put_32 (output_bfd, elf32_arm_plt_entry[2] | (got_displacement & 0x00000fff), |
| 3819 | splt->contents + h->plt.offset + 8); |
| 3820 | #ifdef FOUR_WORD_PLT |
| 3821 | bfd_put_32 (output_bfd, elf32_arm_plt_entry[3], |
| 3822 | splt->contents + h->plt.offset + 12); |
| 3823 | #endif |
| 3824 | |
| 3825 | /* Fill in the entry in the global offset table. */ |
| 3826 | bfd_put_32 (output_bfd, |
| 3827 | (splt->output_section->vma |
| 3828 | + splt->output_offset), |
| 3829 | sgot->contents + got_offset); |
| 3830 | |
| 3831 | /* Fill in the entry in the .rel.plt section. */ |
| 3832 | rel.r_offset = (sgot->output_section->vma |
| 3833 | + sgot->output_offset |
| 3834 | + got_offset); |
| 3835 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT); |
| 3836 | loc = srel->contents + plt_index * sizeof (Elf32_External_Rel); |
| 3837 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3838 | |
| 3839 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 3840 | { |
| 3841 | /* Mark the symbol as undefined, rather than as defined in |
| 3842 | the .plt section. Leave the value alone. */ |
| 3843 | sym->st_shndx = SHN_UNDEF; |
| 3844 | /* If the symbol is weak, we do need to clear the value. |
| 3845 | Otherwise, the PLT entry would provide a definition for |
| 3846 | the symbol even if the symbol wasn't defined anywhere, |
| 3847 | and so the symbol would never be NULL. */ |
| 3848 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) |
| 3849 | == 0) |
| 3850 | sym->st_value = 0; |
| 3851 | } |
| 3852 | } |
| 3853 | |
| 3854 | if (h->got.offset != (bfd_vma) -1) |
| 3855 | { |
| 3856 | asection * sgot; |
| 3857 | asection * srel; |
| 3858 | Elf_Internal_Rela rel; |
| 3859 | bfd_byte *loc; |
| 3860 | |
| 3861 | /* This symbol has an entry in the global offset table. Set it |
| 3862 | up. */ |
| 3863 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 3864 | srel = bfd_get_section_by_name (dynobj, ".rel.got"); |
| 3865 | BFD_ASSERT (sgot != NULL && srel != NULL); |
| 3866 | |
| 3867 | rel.r_offset = (sgot->output_section->vma |
| 3868 | + sgot->output_offset |
| 3869 | + (h->got.offset &~ (bfd_vma) 1)); |
| 3870 | |
| 3871 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 3872 | symbol is defined locally or was forced to be local because |
| 3873 | of a version file, we just want to emit a RELATIVE reloc. |
| 3874 | The entry in the global offset table will already have been |
| 3875 | initialized in the relocate_section function. */ |
| 3876 | if (info->shared |
| 3877 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 3878 | { |
| 3879 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 3880 | rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); |
| 3881 | } |
| 3882 | else |
| 3883 | { |
| 3884 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 3885 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); |
| 3886 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); |
| 3887 | } |
| 3888 | |
| 3889 | loc = srel->contents + srel->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3890 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3891 | } |
| 3892 | |
| 3893 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| 3894 | { |
| 3895 | asection * s; |
| 3896 | Elf_Internal_Rela rel; |
| 3897 | bfd_byte *loc; |
| 3898 | |
| 3899 | /* This symbol needs a copy reloc. Set it up. */ |
| 3900 | BFD_ASSERT (h->dynindx != -1 |
| 3901 | && (h->root.type == bfd_link_hash_defined |
| 3902 | || h->root.type == bfd_link_hash_defweak)); |
| 3903 | |
| 3904 | s = bfd_get_section_by_name (h->root.u.def.section->owner, |
| 3905 | ".rel.bss"); |
| 3906 | BFD_ASSERT (s != NULL); |
| 3907 | |
| 3908 | rel.r_offset = (h->root.u.def.value |
| 3909 | + h->root.u.def.section->output_section->vma |
| 3910 | + h->root.u.def.section->output_offset); |
| 3911 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY); |
| 3912 | loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3913 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3914 | } |
| 3915 | |
| 3916 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| 3917 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 3918 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 3919 | sym->st_shndx = SHN_ABS; |
| 3920 | |
| 3921 | return TRUE; |
| 3922 | } |
| 3923 | |
| 3924 | /* Finish up the dynamic sections. */ |
| 3925 | |
| 3926 | static bfd_boolean |
| 3927 | elf32_arm_finish_dynamic_sections (output_bfd, info) |
| 3928 | bfd * output_bfd; |
| 3929 | struct bfd_link_info * info; |
| 3930 | { |
| 3931 | bfd * dynobj; |
| 3932 | asection * sgot; |
| 3933 | asection * sdyn; |
| 3934 | |
| 3935 | dynobj = elf_hash_table (info)->dynobj; |
| 3936 | |
| 3937 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 3938 | BFD_ASSERT (sgot != NULL); |
| 3939 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 3940 | |
| 3941 | if (elf_hash_table (info)->dynamic_sections_created) |
| 3942 | { |
| 3943 | asection *splt; |
| 3944 | Elf32_External_Dyn *dyncon, *dynconend; |
| 3945 | |
| 3946 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 3947 | BFD_ASSERT (splt != NULL && sdyn != NULL); |
| 3948 | |
| 3949 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 3950 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); |
| 3951 | |
| 3952 | for (; dyncon < dynconend; dyncon++) |
| 3953 | { |
| 3954 | Elf_Internal_Dyn dyn; |
| 3955 | const char * name; |
| 3956 | asection * s; |
| 3957 | |
| 3958 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 3959 | |
| 3960 | switch (dyn.d_tag) |
| 3961 | { |
| 3962 | default: |
| 3963 | break; |
| 3964 | |
| 3965 | case DT_PLTGOT: |
| 3966 | name = ".got"; |
| 3967 | goto get_vma; |
| 3968 | case DT_JMPREL: |
| 3969 | name = ".rel.plt"; |
| 3970 | get_vma: |
| 3971 | s = bfd_get_section_by_name (output_bfd, name); |
| 3972 | BFD_ASSERT (s != NULL); |
| 3973 | dyn.d_un.d_ptr = s->vma; |
| 3974 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 3975 | break; |
| 3976 | |
| 3977 | case DT_PLTRELSZ: |
| 3978 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); |
| 3979 | BFD_ASSERT (s != NULL); |
| 3980 | if (s->_cooked_size != 0) |
| 3981 | dyn.d_un.d_val = s->_cooked_size; |
| 3982 | else |
| 3983 | dyn.d_un.d_val = s->_raw_size; |
| 3984 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 3985 | break; |
| 3986 | |
| 3987 | case DT_RELSZ: |
| 3988 | /* My reading of the SVR4 ABI indicates that the |
| 3989 | procedure linkage table relocs (DT_JMPREL) should be |
| 3990 | included in the overall relocs (DT_REL). This is |
| 3991 | what Solaris does. However, UnixWare can not handle |
| 3992 | that case. Therefore, we override the DT_RELSZ entry |
| 3993 | here to make it not include the JMPREL relocs. Since |
| 3994 | the linker script arranges for .rel.plt to follow all |
| 3995 | other relocation sections, we don't have to worry |
| 3996 | about changing the DT_REL entry. */ |
| 3997 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); |
| 3998 | if (s != NULL) |
| 3999 | { |
| 4000 | if (s->_cooked_size != 0) |
| 4001 | dyn.d_un.d_val -= s->_cooked_size; |
| 4002 | else |
| 4003 | dyn.d_un.d_val -= s->_raw_size; |
| 4004 | } |
| 4005 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 4006 | break; |
| 4007 | |
| 4008 | /* Set the bottom bit of DT_INIT/FINI if the |
| 4009 | corresponding function is Thumb. */ |
| 4010 | case DT_INIT: |
| 4011 | name = info->init_function; |
| 4012 | goto get_sym; |
| 4013 | case DT_FINI: |
| 4014 | name = info->fini_function; |
| 4015 | get_sym: |
| 4016 | /* If it wasn't set by elf_bfd_final_link |
| 4017 | then there is nothing to adjust. */ |
| 4018 | if (dyn.d_un.d_val != 0) |
| 4019 | { |
| 4020 | struct elf_link_hash_entry * eh; |
| 4021 | |
| 4022 | eh = elf_link_hash_lookup (elf_hash_table (info), name, |
| 4023 | FALSE, FALSE, TRUE); |
| 4024 | if (eh != (struct elf_link_hash_entry *) NULL |
| 4025 | && ELF_ST_TYPE (eh->type) == STT_ARM_TFUNC) |
| 4026 | { |
| 4027 | dyn.d_un.d_val |= 1; |
| 4028 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 4029 | } |
| 4030 | } |
| 4031 | break; |
| 4032 | } |
| 4033 | } |
| 4034 | |
| 4035 | /* Fill in the first entry in the procedure linkage table. */ |
| 4036 | if (splt->_raw_size > 0) |
| 4037 | { |
| 4038 | bfd_vma got_displacement; |
| 4039 | |
| 4040 | /* Calculate the displacement between the PLT slot and &GOT[0]. */ |
| 4041 | got_displacement = (sgot->output_section->vma |
| 4042 | + sgot->output_offset |
| 4043 | - splt->output_section->vma |
| 4044 | - splt->output_offset |
| 4045 | - 16); |
| 4046 | |
| 4047 | bfd_put_32 (output_bfd, elf32_arm_plt0_entry[0], splt->contents + 0); |
| 4048 | bfd_put_32 (output_bfd, elf32_arm_plt0_entry[1], splt->contents + 4); |
| 4049 | bfd_put_32 (output_bfd, elf32_arm_plt0_entry[2], splt->contents + 8); |
| 4050 | bfd_put_32 (output_bfd, elf32_arm_plt0_entry[3], splt->contents + 12); |
| 4051 | #ifdef FOUR_WORD_PLT |
| 4052 | /* The displacement value goes in the otherwise-unused last word of |
| 4053 | the second entry. */ |
| 4054 | bfd_put_32 (output_bfd, got_displacement, splt->contents + 28); |
| 4055 | #else |
| 4056 | bfd_put_32 (output_bfd, got_displacement, splt->contents + 16); |
| 4057 | #endif |
| 4058 | } |
| 4059 | |
| 4060 | /* UnixWare sets the entsize of .plt to 4, although that doesn't |
| 4061 | really seem like the right value. */ |
| 4062 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; |
| 4063 | } |
| 4064 | |
| 4065 | /* Fill in the first three entries in the global offset table. */ |
| 4066 | if (sgot->_raw_size > 0) |
| 4067 | { |
| 4068 | if (sdyn == NULL) |
| 4069 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); |
| 4070 | else |
| 4071 | bfd_put_32 (output_bfd, |
| 4072 | sdyn->output_section->vma + sdyn->output_offset, |
| 4073 | sgot->contents); |
| 4074 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); |
| 4075 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); |
| 4076 | } |
| 4077 | |
| 4078 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; |
| 4079 | |
| 4080 | return TRUE; |
| 4081 | } |
| 4082 | |
| 4083 | static void |
| 4084 | elf32_arm_post_process_headers (abfd, link_info) |
| 4085 | bfd * abfd; |
| 4086 | struct bfd_link_info * link_info ATTRIBUTE_UNUSED; |
| 4087 | { |
| 4088 | Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */ |
| 4089 | struct elf32_arm_link_hash_table *globals; |
| 4090 | |
| 4091 | i_ehdrp = elf_elfheader (abfd); |
| 4092 | |
| 4093 | i_ehdrp->e_ident[EI_OSABI] = ARM_ELF_OS_ABI_VERSION; |
| 4094 | i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION; |
| 4095 | |
| 4096 | if (link_info) |
| 4097 | { |
| 4098 | globals = elf32_arm_hash_table (link_info); |
| 4099 | if (globals->byteswap_code) |
| 4100 | i_ehdrp->e_flags |= EF_ARM_BE8; |
| 4101 | } |
| 4102 | } |
| 4103 | |
| 4104 | static enum elf_reloc_type_class |
| 4105 | elf32_arm_reloc_type_class (rela) |
| 4106 | const Elf_Internal_Rela *rela; |
| 4107 | { |
| 4108 | switch ((int) ELF32_R_TYPE (rela->r_info)) |
| 4109 | { |
| 4110 | case R_ARM_RELATIVE: |
| 4111 | return reloc_class_relative; |
| 4112 | case R_ARM_JUMP_SLOT: |
| 4113 | return reloc_class_plt; |
| 4114 | case R_ARM_COPY: |
| 4115 | return reloc_class_copy; |
| 4116 | default: |
| 4117 | return reloc_class_normal; |
| 4118 | } |
| 4119 | } |
| 4120 | |
| 4121 | static bfd_boolean elf32_arm_section_flags PARAMS ((flagword *, const Elf_Internal_Shdr *)); |
| 4122 | static void elf32_arm_final_write_processing PARAMS ((bfd *, bfd_boolean)); |
| 4123 | |
| 4124 | /* Set the right machine number for an Arm ELF file. */ |
| 4125 | |
| 4126 | static bfd_boolean |
| 4127 | elf32_arm_section_flags (flags, hdr) |
| 4128 | flagword *flags; |
| 4129 | const Elf_Internal_Shdr *hdr; |
| 4130 | { |
| 4131 | if (hdr->sh_type == SHT_NOTE) |
| 4132 | *flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_SAME_CONTENTS; |
| 4133 | |
| 4134 | return TRUE; |
| 4135 | } |
| 4136 | |
| 4137 | static void |
| 4138 | elf32_arm_final_write_processing (abfd, linker) |
| 4139 | bfd *abfd; |
| 4140 | bfd_boolean linker ATTRIBUTE_UNUSED; |
| 4141 | { |
| 4142 | bfd_arm_update_notes (abfd, ARM_NOTE_SECTION); |
| 4143 | } |
| 4144 | |
| 4145 | |
| 4146 | /* Called for each symbol. Builds a section map based on mapping symbols. |
| 4147 | Does not alter any of the symbols. */ |
| 4148 | |
| 4149 | static bfd_boolean |
| 4150 | elf32_arm_output_symbol_hook (struct bfd_link_info *info, |
| 4151 | const char *name, |
| 4152 | Elf_Internal_Sym *elfsym, |
| 4153 | asection *input_sec, |
| 4154 | struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) |
| 4155 | { |
| 4156 | int mapcount; |
| 4157 | elf32_arm_section_map *map; |
| 4158 | struct elf32_arm_link_hash_table *globals; |
| 4159 | |
| 4160 | /* Only do this on final link. */ |
| 4161 | if (info->relocatable) |
| 4162 | return TRUE; |
| 4163 | |
| 4164 | /* Only build a map if we need to byteswap code. */ |
| 4165 | globals = elf32_arm_hash_table (info); |
| 4166 | if (!globals->byteswap_code) |
| 4167 | return TRUE; |
| 4168 | |
| 4169 | /* We only want mapping symbols. */ |
| 4170 | if (name == NULL |
| 4171 | || name[0] != '$' |
| 4172 | || (name[1] != 'a' |
| 4173 | && name[1] != 't' |
| 4174 | && name[1] != 'd')) |
| 4175 | return TRUE; |
| 4176 | |
| 4177 | mapcount = ++(elf32_arm_section_data (input_sec)->mapcount); |
| 4178 | map = elf32_arm_section_data (input_sec)->map; |
| 4179 | /* TODO: This may be inefficient, but we probably don't usually have many |
| 4180 | mapping symbols per section. */ |
| 4181 | map = bfd_realloc (map, mapcount * sizeof (elf32_arm_section_map)); |
| 4182 | elf32_arm_section_data (input_sec)->map = map; |
| 4183 | |
| 4184 | map[mapcount - 1].vma = elfsym->st_value; |
| 4185 | map[mapcount - 1].type = name[1]; |
| 4186 | return TRUE; |
| 4187 | } |
| 4188 | |
| 4189 | |
| 4190 | /* Allocate target specific section data. */ |
| 4191 | |
| 4192 | static bfd_boolean |
| 4193 | elf32_arm_new_section_hook (bfd *abfd, asection *sec) |
| 4194 | { |
| 4195 | struct _arm_elf_section_data *sdata; |
| 4196 | bfd_size_type amt = sizeof (*sdata); |
| 4197 | |
| 4198 | sdata = bfd_zalloc (abfd, amt); |
| 4199 | if (sdata == NULL) |
| 4200 | return FALSE; |
| 4201 | sec->used_by_bfd = sdata; |
| 4202 | |
| 4203 | return _bfd_elf_new_section_hook (abfd, sec); |
| 4204 | } |
| 4205 | |
| 4206 | |
| 4207 | /* Used to order a list of mapping symbols by address. */ |
| 4208 | |
| 4209 | static int |
| 4210 | elf32_arm_compare_mapping (const void * a, const void * b) |
| 4211 | { |
| 4212 | return ((const elf32_arm_section_map *) a)->vma |
| 4213 | > ((const elf32_arm_section_map *) b)->vma; |
| 4214 | } |
| 4215 | |
| 4216 | |
| 4217 | /* Do code byteswapping. Return FALSE afterwards so that the section is |
| 4218 | written out as normal. */ |
| 4219 | |
| 4220 | static bfd_boolean |
| 4221 | elf32_arm_write_section (bfd *output_bfd ATTRIBUTE_UNUSED, asection *sec, |
| 4222 | bfd_byte *contents) |
| 4223 | { |
| 4224 | int mapcount; |
| 4225 | elf32_arm_section_map *map; |
| 4226 | bfd_vma ptr; |
| 4227 | bfd_vma end; |
| 4228 | bfd_vma offset; |
| 4229 | bfd_byte tmp; |
| 4230 | int i; |
| 4231 | |
| 4232 | mapcount = elf32_arm_section_data (sec)->mapcount; |
| 4233 | map = elf32_arm_section_data (sec)->map; |
| 4234 | |
| 4235 | if (mapcount == 0) |
| 4236 | return FALSE; |
| 4237 | |
| 4238 | qsort (map, mapcount, sizeof (elf32_arm_section_map), |
| 4239 | elf32_arm_compare_mapping); |
| 4240 | |
| 4241 | offset = sec->output_section->vma + sec->output_offset; |
| 4242 | ptr = map[0].vma - offset; |
| 4243 | for (i = 0; i < mapcount; i++) |
| 4244 | { |
| 4245 | if (i == mapcount - 1) |
| 4246 | end = bfd_section_size (output_bfd, sec); |
| 4247 | else |
| 4248 | end = map[i + 1].vma - offset; |
| 4249 | |
| 4250 | switch (map[i].type) |
| 4251 | { |
| 4252 | case 'a': |
| 4253 | /* Byte swap code words. */ |
| 4254 | while (ptr + 3 < end) |
| 4255 | { |
| 4256 | tmp = contents[ptr]; |
| 4257 | contents[ptr] = contents[ptr + 3]; |
| 4258 | contents[ptr + 3] = tmp; |
| 4259 | tmp = contents[ptr + 1]; |
| 4260 | contents[ptr + 1] = contents[ptr + 2]; |
| 4261 | contents[ptr + 2] = tmp; |
| 4262 | ptr += 4; |
| 4263 | } |
| 4264 | break; |
| 4265 | |
| 4266 | case 't': |
| 4267 | /* Byte swap code halfwords. */ |
| 4268 | while (ptr + 1 < end) |
| 4269 | { |
| 4270 | tmp = contents[ptr]; |
| 4271 | contents[ptr] = contents[ptr + 1]; |
| 4272 | contents[ptr + 1] = tmp; |
| 4273 | ptr += 2; |
| 4274 | } |
| 4275 | break; |
| 4276 | |
| 4277 | case 'd': |
| 4278 | /* Leave data alone. */ |
| 4279 | break; |
| 4280 | } |
| 4281 | ptr = end; |
| 4282 | } |
| 4283 | free (map); |
| 4284 | return FALSE; |
| 4285 | } |
| 4286 | |
| 4287 | #define ELF_ARCH bfd_arch_arm |
| 4288 | #define ELF_MACHINE_CODE EM_ARM |
| 4289 | #ifdef __QNXTARGET__ |
| 4290 | #define ELF_MAXPAGESIZE 0x1000 |
| 4291 | #else |
| 4292 | #define ELF_MAXPAGESIZE 0x8000 |
| 4293 | #endif |
| 4294 | |
| 4295 | #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data |
| 4296 | #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data |
| 4297 | #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags |
| 4298 | #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data |
| 4299 | #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create |
| 4300 | #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup |
| 4301 | #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line |
| 4302 | #define bfd_elf32_new_section_hook elf32_arm_new_section_hook |
| 4303 | |
| 4304 | #define elf_backend_get_symbol_type elf32_arm_get_symbol_type |
| 4305 | #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook |
| 4306 | #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook |
| 4307 | #define elf_backend_check_relocs elf32_arm_check_relocs |
| 4308 | #define elf_backend_relocate_section elf32_arm_relocate_section |
| 4309 | #define elf_backend_write_section elf32_arm_write_section |
| 4310 | #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol |
| 4311 | #define elf_backend_create_dynamic_sections elf32_arm_create_dynamic_sections |
| 4312 | #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol |
| 4313 | #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections |
| 4314 | #define elf_backend_link_output_symbol_hook elf32_arm_output_symbol_hook |
| 4315 | #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections |
| 4316 | #define elf_backend_post_process_headers elf32_arm_post_process_headers |
| 4317 | #define elf_backend_reloc_type_class elf32_arm_reloc_type_class |
| 4318 | #define elf_backend_object_p elf32_arm_object_p |
| 4319 | #define elf_backend_section_flags elf32_arm_section_flags |
| 4320 | #define elf_backend_final_write_processing elf32_arm_final_write_processing |
| 4321 | #define elf_backend_copy_indirect_symbol elf32_arm_copy_indirect_symbol |
| 4322 | |
| 4323 | #define elf_backend_can_refcount 1 |
| 4324 | #define elf_backend_can_gc_sections 1 |
| 4325 | #define elf_backend_plt_readonly 1 |
| 4326 | #define elf_backend_want_got_plt 1 |
| 4327 | #define elf_backend_want_plt_sym 0 |
| 4328 | #if !USE_REL |
| 4329 | #define elf_backend_rela_normal 1 |
| 4330 | #endif |
| 4331 | |
| 4332 | #define elf_backend_got_header_size 12 |
| 4333 | |
| 4334 | #include "elf32-target.h" |
| 4335 | |