| 1 | /* 32-bit ELF support for ARM |
| 2 | Copyright 1998, 1999, 2000 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of BFD, the Binary File Descriptor library. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | typedef unsigned long int insn32; |
| 21 | typedef unsigned short int insn16; |
| 22 | |
| 23 | static boolean elf32_arm_set_private_flags |
| 24 | PARAMS ((bfd *, flagword)); |
| 25 | static boolean elf32_arm_copy_private_bfd_data |
| 26 | PARAMS ((bfd *, bfd *)); |
| 27 | static boolean elf32_arm_merge_private_bfd_data |
| 28 | PARAMS ((bfd *, bfd *)); |
| 29 | static boolean elf32_arm_print_private_bfd_data |
| 30 | PARAMS ((bfd *, PTR)); |
| 31 | static int elf32_arm_get_symbol_type |
| 32 | PARAMS (( Elf_Internal_Sym *, int)); |
| 33 | static struct bfd_link_hash_table *elf32_arm_link_hash_table_create |
| 34 | PARAMS ((bfd *)); |
| 35 | static bfd_reloc_status_type elf32_arm_final_link_relocate |
| 36 | PARAMS ((reloc_howto_type *, bfd *, bfd *, asection *, bfd_byte *, |
| 37 | Elf_Internal_Rela *, bfd_vma, struct bfd_link_info *, asection *, |
| 38 | const char *, unsigned char, struct elf_link_hash_entry *)); |
| 39 | static insn32 insert_thumb_branch |
| 40 | PARAMS ((insn32, int)); |
| 41 | static struct elf_link_hash_entry *find_thumb_glue |
| 42 | PARAMS ((struct bfd_link_info *, CONST char *, bfd *)); |
| 43 | static struct elf_link_hash_entry *find_arm_glue |
| 44 | PARAMS ((struct bfd_link_info *, CONST char *, bfd *)); |
| 45 | static void record_arm_to_thumb_glue |
| 46 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 47 | static void record_thumb_to_arm_glue |
| 48 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 49 | static void elf32_arm_post_process_headers |
| 50 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 51 | static int elf32_arm_to_thumb_stub |
| 52 | PARAMS ((struct bfd_link_info *, const char *, bfd *, bfd *, asection *, |
| 53 | bfd_byte *, asection *, bfd_vma, bfd_signed_vma, bfd_vma)); |
| 54 | static int elf32_thumb_to_arm_stub |
| 55 | PARAMS ((struct bfd_link_info *, const char *, bfd *, bfd *, asection *, |
| 56 | bfd_byte *, asection *, bfd_vma, bfd_signed_vma, bfd_vma)); |
| 57 | |
| 58 | #define INTERWORK_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_INTERWORK) |
| 59 | |
| 60 | /* The linker script knows the section names for placement. |
| 61 | The entry_names are used to do simple name mangling on the stubs. |
| 62 | Given a function name, and its type, the stub can be found. The |
| 63 | name can be changed. The only requirement is the %s be present. */ |
| 64 | #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" |
| 65 | #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" |
| 66 | |
| 67 | #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" |
| 68 | #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" |
| 69 | |
| 70 | /* The name of the dynamic interpreter. This is put in the .interp |
| 71 | section. */ |
| 72 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" |
| 73 | |
| 74 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 75 | #define PLT_ENTRY_SIZE 16 |
| 76 | |
| 77 | /* The first entry in a procedure linkage table looks like |
| 78 | this. It is set up so that any shared library function that is |
| 79 | called before the relocation has been set up calls the dynamic |
| 80 | linker first. */ |
| 81 | static const bfd_byte elf32_arm_plt0_entry [PLT_ENTRY_SIZE] = |
| 82 | { |
| 83 | 0x04, 0xe0, 0x2d, 0xe5, /* str lr, [sp, #-4]! */ |
| 84 | 0x10, 0xe0, 0x9f, 0xe5, /* ldr lr, [pc, #16] */ |
| 85 | 0x0e, 0xe0, 0x8f, 0xe0, /* adr lr, pc, lr */ |
| 86 | 0x08, 0xf0, 0xbe, 0xe5 /* ldr pc, [lr, #8]! */ |
| 87 | }; |
| 88 | |
| 89 | /* Subsequent entries in a procedure linkage table look like |
| 90 | this. */ |
| 91 | static const bfd_byte elf32_arm_plt_entry [PLT_ENTRY_SIZE] = |
| 92 | { |
| 93 | 0x04, 0xc0, 0x9f, 0xe5, /* ldr ip, [pc, #4] */ |
| 94 | 0x0c, 0xc0, 0x8f, 0xe0, /* add ip, pc, ip */ |
| 95 | 0x00, 0xf0, 0x9c, 0xe5, /* ldr pc, [ip] */ |
| 96 | 0x00, 0x00, 0x00, 0x00 /* offset to symbol in got */ |
| 97 | }; |
| 98 | |
| 99 | /* The ARM linker needs to keep track of the number of relocs that it |
| 100 | decides to copy in check_relocs for each symbol. This is so that |
| 101 | it can discard PC relative relocs if it doesn't need them when |
| 102 | linking with -Bsymbolic. We store the information in a field |
| 103 | extending the regular ELF linker hash table. */ |
| 104 | |
| 105 | /* This structure keeps track of the number of PC relative relocs we |
| 106 | have copied for a given symbol. */ |
| 107 | struct elf32_arm_pcrel_relocs_copied |
| 108 | { |
| 109 | /* Next section. */ |
| 110 | struct elf32_arm_pcrel_relocs_copied * next; |
| 111 | /* A section in dynobj. */ |
| 112 | asection * section; |
| 113 | /* Number of relocs copied in this section. */ |
| 114 | bfd_size_type count; |
| 115 | }; |
| 116 | |
| 117 | /* Arm ELF linker hash entry. */ |
| 118 | struct elf32_arm_link_hash_entry |
| 119 | { |
| 120 | struct elf_link_hash_entry root; |
| 121 | |
| 122 | /* Number of PC relative relocs copied for this symbol. */ |
| 123 | struct elf32_arm_pcrel_relocs_copied * pcrel_relocs_copied; |
| 124 | }; |
| 125 | |
| 126 | /* Declare this now that the above structures are defined. */ |
| 127 | static boolean elf32_arm_discard_copies |
| 128 | PARAMS ((struct elf32_arm_link_hash_entry *, PTR)); |
| 129 | |
| 130 | /* Traverse an arm ELF linker hash table. */ |
| 131 | #define elf32_arm_link_hash_traverse(table, func, info) \ |
| 132 | (elf_link_hash_traverse \ |
| 133 | (&(table)->root, \ |
| 134 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ |
| 135 | (info))) |
| 136 | |
| 137 | /* Get the ARM elf linker hash table from a link_info structure. */ |
| 138 | #define elf32_arm_hash_table(info) \ |
| 139 | ((struct elf32_arm_link_hash_table *) ((info)->hash)) |
| 140 | |
| 141 | /* ARM ELF linker hash table. */ |
| 142 | struct elf32_arm_link_hash_table |
| 143 | { |
| 144 | /* The main hash table. */ |
| 145 | struct elf_link_hash_table root; |
| 146 | |
| 147 | /* The size in bytes of the section containg the Thumb-to-ARM glue. */ |
| 148 | long int thumb_glue_size; |
| 149 | |
| 150 | /* The size in bytes of the section containg the ARM-to-Thumb glue. */ |
| 151 | long int arm_glue_size; |
| 152 | |
| 153 | /* An arbitary input BFD chosen to hold the glue sections. */ |
| 154 | bfd * bfd_of_glue_owner; |
| 155 | |
| 156 | /* A boolean indicating whether knowledge of the ARM's pipeline |
| 157 | length should be applied by the linker. */ |
| 158 | int no_pipeline_knowledge; |
| 159 | }; |
| 160 | |
| 161 | /* Create an entry in an ARM ELF linker hash table. */ |
| 162 | |
| 163 | static struct bfd_hash_entry * |
| 164 | elf32_arm_link_hash_newfunc (entry, table, string) |
| 165 | struct bfd_hash_entry * entry; |
| 166 | struct bfd_hash_table * table; |
| 167 | const char * string; |
| 168 | { |
| 169 | struct elf32_arm_link_hash_entry * ret = |
| 170 | (struct elf32_arm_link_hash_entry *) entry; |
| 171 | |
| 172 | /* Allocate the structure if it has not already been allocated by a |
| 173 | subclass. */ |
| 174 | if (ret == (struct elf32_arm_link_hash_entry *) NULL) |
| 175 | ret = ((struct elf32_arm_link_hash_entry *) |
| 176 | bfd_hash_allocate (table, |
| 177 | sizeof (struct elf32_arm_link_hash_entry))); |
| 178 | if (ret == (struct elf32_arm_link_hash_entry *) NULL) |
| 179 | return (struct bfd_hash_entry *) ret; |
| 180 | |
| 181 | /* Call the allocation method of the superclass. */ |
| 182 | ret = ((struct elf32_arm_link_hash_entry *) |
| 183 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, |
| 184 | table, string)); |
| 185 | if (ret != (struct elf32_arm_link_hash_entry *) NULL) |
| 186 | ret->pcrel_relocs_copied = NULL; |
| 187 | |
| 188 | return (struct bfd_hash_entry *) ret; |
| 189 | } |
| 190 | |
| 191 | /* Create an ARM elf linker hash table. */ |
| 192 | |
| 193 | static struct bfd_link_hash_table * |
| 194 | elf32_arm_link_hash_table_create (abfd) |
| 195 | bfd *abfd; |
| 196 | { |
| 197 | struct elf32_arm_link_hash_table *ret; |
| 198 | |
| 199 | ret = ((struct elf32_arm_link_hash_table *) |
| 200 | bfd_alloc (abfd, sizeof (struct elf32_arm_link_hash_table))); |
| 201 | if (ret == (struct elf32_arm_link_hash_table *) NULL) |
| 202 | return NULL; |
| 203 | |
| 204 | if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, |
| 205 | elf32_arm_link_hash_newfunc)) |
| 206 | { |
| 207 | bfd_release (abfd, ret); |
| 208 | return NULL; |
| 209 | } |
| 210 | |
| 211 | ret->thumb_glue_size = 0; |
| 212 | ret->arm_glue_size = 0; |
| 213 | ret->bfd_of_glue_owner = NULL; |
| 214 | ret->no_pipeline_knowledge = 0; |
| 215 | |
| 216 | return &ret->root.root; |
| 217 | } |
| 218 | |
| 219 | /* Locate the Thumb encoded calling stub for NAME. */ |
| 220 | |
| 221 | static struct elf_link_hash_entry * |
| 222 | find_thumb_glue (link_info, name, input_bfd) |
| 223 | struct bfd_link_info *link_info; |
| 224 | CONST char *name; |
| 225 | bfd *input_bfd; |
| 226 | { |
| 227 | char *tmp_name; |
| 228 | struct elf_link_hash_entry *hash; |
| 229 | struct elf32_arm_link_hash_table *hash_table; |
| 230 | |
| 231 | /* We need a pointer to the armelf specific hash table. */ |
| 232 | hash_table = elf32_arm_hash_table (link_info); |
| 233 | |
| 234 | tmp_name = ((char *) |
| 235 | bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1)); |
| 236 | |
| 237 | BFD_ASSERT (tmp_name); |
| 238 | |
| 239 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); |
| 240 | |
| 241 | hash = elf_link_hash_lookup |
| 242 | (&(hash_table)->root, tmp_name, false, false, true); |
| 243 | |
| 244 | if (hash == NULL) |
| 245 | /* xgettext:c-format */ |
| 246 | _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"), |
| 247 | bfd_get_filename (input_bfd), tmp_name, name); |
| 248 | |
| 249 | free (tmp_name); |
| 250 | |
| 251 | return hash; |
| 252 | } |
| 253 | |
| 254 | /* Locate the ARM encoded calling stub for NAME. */ |
| 255 | |
| 256 | static struct elf_link_hash_entry * |
| 257 | find_arm_glue (link_info, name, input_bfd) |
| 258 | struct bfd_link_info *link_info; |
| 259 | CONST char *name; |
| 260 | bfd *input_bfd; |
| 261 | { |
| 262 | char *tmp_name; |
| 263 | struct elf_link_hash_entry *myh; |
| 264 | struct elf32_arm_link_hash_table *hash_table; |
| 265 | |
| 266 | /* We need a pointer to the elfarm specific hash table. */ |
| 267 | hash_table = elf32_arm_hash_table (link_info); |
| 268 | |
| 269 | tmp_name = ((char *) |
| 270 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); |
| 271 | |
| 272 | BFD_ASSERT (tmp_name); |
| 273 | |
| 274 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); |
| 275 | |
| 276 | myh = elf_link_hash_lookup |
| 277 | (&(hash_table)->root, tmp_name, false, false, true); |
| 278 | |
| 279 | if (myh == NULL) |
| 280 | /* xgettext:c-format */ |
| 281 | _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"), |
| 282 | bfd_get_filename (input_bfd), tmp_name, name); |
| 283 | |
| 284 | free (tmp_name); |
| 285 | |
| 286 | return myh; |
| 287 | } |
| 288 | |
| 289 | /* ARM->Thumb glue: |
| 290 | |
| 291 | .arm |
| 292 | __func_from_arm: |
| 293 | ldr r12, __func_addr |
| 294 | bx r12 |
| 295 | __func_addr: |
| 296 | .word func @ behave as if you saw a ARM_32 reloc. */ |
| 297 | |
| 298 | #define ARM2THUMB_GLUE_SIZE 12 |
| 299 | static const insn32 a2t1_ldr_insn = 0xe59fc000; |
| 300 | static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; |
| 301 | static const insn32 a2t3_func_addr_insn = 0x00000001; |
| 302 | |
| 303 | /* Thumb->ARM: Thumb->(non-interworking aware) ARM |
| 304 | |
| 305 | .thumb .thumb |
| 306 | .align 2 .align 2 |
| 307 | __func_from_thumb: __func_from_thumb: |
| 308 | bx pc push {r6, lr} |
| 309 | nop ldr r6, __func_addr |
| 310 | .arm mov lr, pc |
| 311 | __func_change_to_arm: bx r6 |
| 312 | b func .arm |
| 313 | __func_back_to_thumb: |
| 314 | ldmia r13! {r6, lr} |
| 315 | bx lr |
| 316 | __func_addr: |
| 317 | .word func */ |
| 318 | |
| 319 | #define THUMB2ARM_GLUE_SIZE 8 |
| 320 | static const insn16 t2a1_bx_pc_insn = 0x4778; |
| 321 | static const insn16 t2a2_noop_insn = 0x46c0; |
| 322 | static const insn32 t2a3_b_insn = 0xea000000; |
| 323 | |
| 324 | static const insn16 t2a1_push_insn = 0xb540; |
| 325 | static const insn16 t2a2_ldr_insn = 0x4e03; |
| 326 | static const insn16 t2a3_mov_insn = 0x46fe; |
| 327 | static const insn16 t2a4_bx_insn = 0x4730; |
| 328 | static const insn32 t2a5_pop_insn = 0xe8bd4040; |
| 329 | static const insn32 t2a6_bx_insn = 0xe12fff1e; |
| 330 | |
| 331 | boolean |
| 332 | bfd_elf32_arm_allocate_interworking_sections (info) |
| 333 | struct bfd_link_info * info; |
| 334 | { |
| 335 | asection * s; |
| 336 | bfd_byte * foo; |
| 337 | struct elf32_arm_link_hash_table * globals; |
| 338 | |
| 339 | globals = elf32_arm_hash_table (info); |
| 340 | |
| 341 | BFD_ASSERT (globals != NULL); |
| 342 | |
| 343 | if (globals->arm_glue_size != 0) |
| 344 | { |
| 345 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 346 | |
| 347 | s = bfd_get_section_by_name |
| 348 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); |
| 349 | |
| 350 | BFD_ASSERT (s != NULL); |
| 351 | |
| 352 | foo = (bfd_byte *) bfd_alloc |
| 353 | (globals->bfd_of_glue_owner, globals->arm_glue_size); |
| 354 | |
| 355 | s->_raw_size = s->_cooked_size = globals->arm_glue_size; |
| 356 | s->contents = foo; |
| 357 | } |
| 358 | |
| 359 | if (globals->thumb_glue_size != 0) |
| 360 | { |
| 361 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 362 | |
| 363 | s = bfd_get_section_by_name |
| 364 | (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); |
| 365 | |
| 366 | BFD_ASSERT (s != NULL); |
| 367 | |
| 368 | foo = (bfd_byte *) bfd_alloc |
| 369 | (globals->bfd_of_glue_owner, globals->thumb_glue_size); |
| 370 | |
| 371 | s->_raw_size = s->_cooked_size = globals->thumb_glue_size; |
| 372 | s->contents = foo; |
| 373 | } |
| 374 | |
| 375 | return true; |
| 376 | } |
| 377 | |
| 378 | static void |
| 379 | record_arm_to_thumb_glue (link_info, h) |
| 380 | struct bfd_link_info * link_info; |
| 381 | struct elf_link_hash_entry * h; |
| 382 | { |
| 383 | const char * name = h->root.root.string; |
| 384 | register asection * s; |
| 385 | char * tmp_name; |
| 386 | struct elf_link_hash_entry * myh; |
| 387 | struct elf32_arm_link_hash_table * globals; |
| 388 | |
| 389 | globals = elf32_arm_hash_table (link_info); |
| 390 | |
| 391 | BFD_ASSERT (globals != NULL); |
| 392 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 393 | |
| 394 | s = bfd_get_section_by_name |
| 395 | (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); |
| 396 | |
| 397 | BFD_ASSERT (s != NULL); |
| 398 | |
| 399 | tmp_name = ((char *) |
| 400 | bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1)); |
| 401 | |
| 402 | BFD_ASSERT (tmp_name); |
| 403 | |
| 404 | sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); |
| 405 | |
| 406 | myh = elf_link_hash_lookup |
| 407 | (&(globals)->root, tmp_name, false, false, true); |
| 408 | |
| 409 | if (myh != NULL) |
| 410 | { |
| 411 | /* We've already seen this guy. */ |
| 412 | free (tmp_name); |
| 413 | return; |
| 414 | } |
| 415 | |
| 416 | /* The only trick here is using hash_table->arm_glue_size as the value. Even |
| 417 | though the section isn't allocated yet, this is where we will be putting |
| 418 | it. */ |
| 419 | _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner, tmp_name, |
| 420 | BSF_GLOBAL, |
| 421 | s, globals->arm_glue_size + 1, |
| 422 | NULL, true, false, |
| 423 | (struct bfd_link_hash_entry **) &myh); |
| 424 | |
| 425 | free (tmp_name); |
| 426 | |
| 427 | globals->arm_glue_size += ARM2THUMB_GLUE_SIZE; |
| 428 | |
| 429 | return; |
| 430 | } |
| 431 | |
| 432 | static void |
| 433 | record_thumb_to_arm_glue (link_info, h) |
| 434 | struct bfd_link_info *link_info; |
| 435 | struct elf_link_hash_entry *h; |
| 436 | { |
| 437 | const char *name = h->root.root.string; |
| 438 | register asection *s; |
| 439 | char *tmp_name; |
| 440 | struct elf_link_hash_entry *myh; |
| 441 | struct elf32_arm_link_hash_table *hash_table; |
| 442 | char bind; |
| 443 | |
| 444 | hash_table = elf32_arm_hash_table (link_info); |
| 445 | |
| 446 | BFD_ASSERT (hash_table != NULL); |
| 447 | BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL); |
| 448 | |
| 449 | s = bfd_get_section_by_name |
| 450 | (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); |
| 451 | |
| 452 | BFD_ASSERT (s != NULL); |
| 453 | |
| 454 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); |
| 455 | |
| 456 | BFD_ASSERT (tmp_name); |
| 457 | |
| 458 | sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); |
| 459 | |
| 460 | myh = elf_link_hash_lookup |
| 461 | (&(hash_table)->root, tmp_name, false, false, true); |
| 462 | |
| 463 | if (myh != NULL) |
| 464 | { |
| 465 | /* We've already seen this guy. */ |
| 466 | free (tmp_name); |
| 467 | return; |
| 468 | } |
| 469 | |
| 470 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, |
| 471 | BSF_GLOBAL, s, hash_table->thumb_glue_size + 1, |
| 472 | NULL, true, false, |
| 473 | (struct bfd_link_hash_entry **) &myh); |
| 474 | |
| 475 | /* If we mark it 'Thumb', the disassembler will do a better job. */ |
| 476 | bind = ELF_ST_BIND (myh->type); |
| 477 | myh->type = ELF_ST_INFO (bind, STT_ARM_TFUNC); |
| 478 | |
| 479 | free (tmp_name); |
| 480 | |
| 481 | #define CHANGE_TO_ARM "__%s_change_to_arm" |
| 482 | #define BACK_FROM_ARM "__%s_back_from_arm" |
| 483 | |
| 484 | /* Allocate another symbol to mark where we switch to Arm mode. */ |
| 485 | tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1); |
| 486 | |
| 487 | BFD_ASSERT (tmp_name); |
| 488 | |
| 489 | sprintf (tmp_name, CHANGE_TO_ARM, name); |
| 490 | |
| 491 | myh = NULL; |
| 492 | |
| 493 | _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, |
| 494 | BSF_LOCAL, s, hash_table->thumb_glue_size + 4, |
| 495 | NULL, true, false, |
| 496 | (struct bfd_link_hash_entry **) &myh); |
| 497 | |
| 498 | free (tmp_name); |
| 499 | |
| 500 | hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE; |
| 501 | |
| 502 | return; |
| 503 | } |
| 504 | |
| 505 | /* Select a BFD to be used to hold the sections used by the glue code. |
| 506 | This function is called from the linker scripts in ld/emultempl/ |
| 507 | {armelf/pe}.em */ |
| 508 | |
| 509 | boolean |
| 510 | bfd_elf32_arm_get_bfd_for_interworking (abfd, info) |
| 511 | bfd *abfd; |
| 512 | struct bfd_link_info *info; |
| 513 | { |
| 514 | struct elf32_arm_link_hash_table *globals; |
| 515 | flagword flags; |
| 516 | asection *sec; |
| 517 | |
| 518 | /* If we are only performing a partial link do not bother |
| 519 | getting a bfd to hold the glue. */ |
| 520 | if (info->relocateable) |
| 521 | return true; |
| 522 | |
| 523 | globals = elf32_arm_hash_table (info); |
| 524 | |
| 525 | BFD_ASSERT (globals != NULL); |
| 526 | |
| 527 | if (globals->bfd_of_glue_owner != NULL) |
| 528 | return true; |
| 529 | |
| 530 | sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); |
| 531 | |
| 532 | if (sec == NULL) |
| 533 | { |
| 534 | /* Note: we do not include the flag SEC_LINKER_CREATED, as this |
| 535 | will prevent elf_link_input_bfd() from processing the contents |
| 536 | of this section. */ |
| 537 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; |
| 538 | |
| 539 | sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME); |
| 540 | |
| 541 | if (sec == NULL |
| 542 | || !bfd_set_section_flags (abfd, sec, flags) |
| 543 | || !bfd_set_section_alignment (abfd, sec, 2)) |
| 544 | return false; |
| 545 | |
| 546 | /* Set the gc mark to prevent the section from being removed by garbage |
| 547 | collection, despite the fact that no relocs refer to this section. */ |
| 548 | sec->gc_mark = 1; |
| 549 | } |
| 550 | |
| 551 | sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME); |
| 552 | |
| 553 | if (sec == NULL) |
| 554 | { |
| 555 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; |
| 556 | |
| 557 | sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME); |
| 558 | |
| 559 | if (sec == NULL |
| 560 | || !bfd_set_section_flags (abfd, sec, flags) |
| 561 | || !bfd_set_section_alignment (abfd, sec, 2)) |
| 562 | return false; |
| 563 | |
| 564 | sec->gc_mark = 1; |
| 565 | } |
| 566 | |
| 567 | /* Save the bfd for later use. */ |
| 568 | globals->bfd_of_glue_owner = abfd; |
| 569 | |
| 570 | return true; |
| 571 | } |
| 572 | |
| 573 | boolean |
| 574 | bfd_elf32_arm_process_before_allocation (abfd, link_info, no_pipeline_knowledge) |
| 575 | bfd *abfd; |
| 576 | struct bfd_link_info *link_info; |
| 577 | int no_pipeline_knowledge; |
| 578 | { |
| 579 | Elf_Internal_Shdr *symtab_hdr; |
| 580 | Elf_Internal_Rela *free_relocs = NULL; |
| 581 | Elf_Internal_Rela *irel, *irelend; |
| 582 | bfd_byte *contents = NULL; |
| 583 | bfd_byte *free_contents = NULL; |
| 584 | Elf32_External_Sym *extsyms = NULL; |
| 585 | Elf32_External_Sym *free_extsyms = NULL; |
| 586 | |
| 587 | asection *sec; |
| 588 | struct elf32_arm_link_hash_table *globals; |
| 589 | |
| 590 | /* If we are only performing a partial link do not bother |
| 591 | to construct any glue. */ |
| 592 | if (link_info->relocateable) |
| 593 | return true; |
| 594 | |
| 595 | /* Here we have a bfd that is to be included on the link. We have a hook |
| 596 | to do reloc rummaging, before section sizes are nailed down. */ |
| 597 | globals = elf32_arm_hash_table (link_info); |
| 598 | |
| 599 | BFD_ASSERT (globals != NULL); |
| 600 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 601 | |
| 602 | globals->no_pipeline_knowledge = no_pipeline_knowledge; |
| 603 | |
| 604 | /* Rummage around all the relocs and map the glue vectors. */ |
| 605 | sec = abfd->sections; |
| 606 | |
| 607 | if (sec == NULL) |
| 608 | return true; |
| 609 | |
| 610 | for (; sec != NULL; sec = sec->next) |
| 611 | { |
| 612 | if (sec->reloc_count == 0) |
| 613 | continue; |
| 614 | |
| 615 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 616 | |
| 617 | /* Load the relocs. */ |
| 618 | irel = (_bfd_elf32_link_read_relocs (abfd, sec, (PTR) NULL, |
| 619 | (Elf_Internal_Rela *) NULL, false)); |
| 620 | |
| 621 | BFD_ASSERT (irel != 0); |
| 622 | |
| 623 | irelend = irel + sec->reloc_count; |
| 624 | for (; irel < irelend; irel++) |
| 625 | { |
| 626 | long r_type; |
| 627 | unsigned long r_index; |
| 628 | |
| 629 | struct elf_link_hash_entry *h; |
| 630 | |
| 631 | r_type = ELF32_R_TYPE (irel->r_info); |
| 632 | r_index = ELF32_R_SYM (irel->r_info); |
| 633 | |
| 634 | /* These are the only relocation types we care about. */ |
| 635 | if ( r_type != R_ARM_PC24 |
| 636 | && r_type != R_ARM_THM_PC22) |
| 637 | continue; |
| 638 | |
| 639 | /* Get the section contents if we haven't done so already. */ |
| 640 | if (contents == NULL) |
| 641 | { |
| 642 | /* Get cached copy if it exists. */ |
| 643 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 644 | contents = elf_section_data (sec)->this_hdr.contents; |
| 645 | else |
| 646 | { |
| 647 | /* Go get them off disk. */ |
| 648 | contents = (bfd_byte *) bfd_malloc (sec->_raw_size); |
| 649 | if (contents == NULL) |
| 650 | goto error_return; |
| 651 | |
| 652 | free_contents = contents; |
| 653 | |
| 654 | if (!bfd_get_section_contents (abfd, sec, contents, |
| 655 | (file_ptr) 0, sec->_raw_size)) |
| 656 | goto error_return; |
| 657 | } |
| 658 | } |
| 659 | |
| 660 | /* Read this BFD's symbols if we haven't done so already. */ |
| 661 | if (extsyms == NULL) |
| 662 | { |
| 663 | /* Get cached copy if it exists. */ |
| 664 | if (symtab_hdr->contents != NULL) |
| 665 | extsyms = (Elf32_External_Sym *) symtab_hdr->contents; |
| 666 | else |
| 667 | { |
| 668 | /* Go get them off disk. */ |
| 669 | extsyms = ((Elf32_External_Sym *) |
| 670 | bfd_malloc (symtab_hdr->sh_size)); |
| 671 | if (extsyms == NULL) |
| 672 | goto error_return; |
| 673 | |
| 674 | free_extsyms = extsyms; |
| 675 | |
| 676 | if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 |
| 677 | || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd) |
| 678 | != symtab_hdr->sh_size)) |
| 679 | goto error_return; |
| 680 | } |
| 681 | } |
| 682 | |
| 683 | /* If the relocation is not against a symbol it cannot concern us. */ |
| 684 | h = NULL; |
| 685 | |
| 686 | /* We don't care about local symbols. */ |
| 687 | if (r_index < symtab_hdr->sh_info) |
| 688 | continue; |
| 689 | |
| 690 | /* This is an external symbol. */ |
| 691 | r_index -= symtab_hdr->sh_info; |
| 692 | h = (struct elf_link_hash_entry *) |
| 693 | elf_sym_hashes (abfd)[r_index]; |
| 694 | |
| 695 | /* If the relocation is against a static symbol it must be within |
| 696 | the current section and so cannot be a cross ARM/Thumb relocation. */ |
| 697 | if (h == NULL) |
| 698 | continue; |
| 699 | |
| 700 | switch (r_type) |
| 701 | { |
| 702 | case R_ARM_PC24: |
| 703 | /* This one is a call from arm code. We need to look up |
| 704 | the target of the call. If it is a thumb target, we |
| 705 | insert glue. */ |
| 706 | if (ELF_ST_TYPE(h->type) == STT_ARM_TFUNC) |
| 707 | record_arm_to_thumb_glue (link_info, h); |
| 708 | break; |
| 709 | |
| 710 | case R_ARM_THM_PC22: |
| 711 | /* This one is a call from thumb code. We look |
| 712 | up the target of the call. If it is not a thumb |
| 713 | target, we insert glue. */ |
| 714 | if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC) |
| 715 | record_thumb_to_arm_glue (link_info, h); |
| 716 | break; |
| 717 | |
| 718 | default: |
| 719 | break; |
| 720 | } |
| 721 | } |
| 722 | } |
| 723 | |
| 724 | return true; |
| 725 | |
| 726 | error_return: |
| 727 | if (free_relocs != NULL) |
| 728 | free (free_relocs); |
| 729 | if (free_contents != NULL) |
| 730 | free (free_contents); |
| 731 | if (free_extsyms != NULL) |
| 732 | free (free_extsyms); |
| 733 | |
| 734 | return false; |
| 735 | } |
| 736 | |
| 737 | /* The thumb form of a long branch is a bit finicky, because the offset |
| 738 | encoding is split over two fields, each in it's own instruction. They |
| 739 | can occur in any order. So given a thumb form of long branch, and an |
| 740 | offset, insert the offset into the thumb branch and return finished |
| 741 | instruction. |
| 742 | |
| 743 | It takes two thumb instructions to encode the target address. Each has |
| 744 | 11 bits to invest. The upper 11 bits are stored in one (identifed by |
| 745 | H-0.. see below), the lower 11 bits are stored in the other (identified |
| 746 | by H-1). |
| 747 | |
| 748 | Combine together and shifted left by 1 (it's a half word address) and |
| 749 | there you have it. |
| 750 | |
| 751 | Op: 1111 = F, |
| 752 | H-0, upper address-0 = 000 |
| 753 | Op: 1111 = F, |
| 754 | H-1, lower address-0 = 800 |
| 755 | |
| 756 | They can be ordered either way, but the arm tools I've seen always put |
| 757 | the lower one first. It probably doesn't matter. krk@cygnus.com |
| 758 | |
| 759 | XXX: Actually the order does matter. The second instruction (H-1) |
| 760 | moves the computed address into the PC, so it must be the second one |
| 761 | in the sequence. The problem, however is that whilst little endian code |
| 762 | stores the instructions in HI then LOW order, big endian code does the |
| 763 | reverse. nickc@cygnus.com. */ |
| 764 | |
| 765 | #define LOW_HI_ORDER 0xF800F000 |
| 766 | #define HI_LOW_ORDER 0xF000F800 |
| 767 | |
| 768 | static insn32 |
| 769 | insert_thumb_branch (br_insn, rel_off) |
| 770 | insn32 br_insn; |
| 771 | int rel_off; |
| 772 | { |
| 773 | unsigned int low_bits; |
| 774 | unsigned int high_bits; |
| 775 | |
| 776 | BFD_ASSERT ((rel_off & 1) != 1); |
| 777 | |
| 778 | rel_off >>= 1; /* Half word aligned address. */ |
| 779 | low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */ |
| 780 | high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */ |
| 781 | |
| 782 | if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER) |
| 783 | br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits; |
| 784 | else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER) |
| 785 | br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits; |
| 786 | else |
| 787 | /* FIXME: abort is probably not the right call. krk@cygnus.com */ |
| 788 | abort (); /* error - not a valid branch instruction form. */ |
| 789 | |
| 790 | return br_insn; |
| 791 | } |
| 792 | |
| 793 | /* Thumb code calling an ARM function. */ |
| 794 | |
| 795 | static int |
| 796 | elf32_thumb_to_arm_stub (info, name, input_bfd, output_bfd, input_section, |
| 797 | hit_data, sym_sec, offset, addend, val) |
| 798 | struct bfd_link_info * info; |
| 799 | const char * name; |
| 800 | bfd * input_bfd; |
| 801 | bfd * output_bfd; |
| 802 | asection * input_section; |
| 803 | bfd_byte * hit_data; |
| 804 | asection * sym_sec; |
| 805 | bfd_vma offset; |
| 806 | bfd_signed_vma addend; |
| 807 | bfd_vma val; |
| 808 | { |
| 809 | asection * s = 0; |
| 810 | long int my_offset; |
| 811 | unsigned long int tmp; |
| 812 | long int ret_offset; |
| 813 | struct elf_link_hash_entry * myh; |
| 814 | struct elf32_arm_link_hash_table * globals; |
| 815 | |
| 816 | myh = find_thumb_glue (info, name, input_bfd); |
| 817 | if (myh == NULL) |
| 818 | return false; |
| 819 | |
| 820 | globals = elf32_arm_hash_table (info); |
| 821 | |
| 822 | BFD_ASSERT (globals != NULL); |
| 823 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 824 | |
| 825 | my_offset = myh->root.u.def.value; |
| 826 | |
| 827 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, |
| 828 | THUMB2ARM_GLUE_SECTION_NAME); |
| 829 | |
| 830 | BFD_ASSERT (s != NULL); |
| 831 | BFD_ASSERT (s->contents != NULL); |
| 832 | BFD_ASSERT (s->output_section != NULL); |
| 833 | |
| 834 | if ((my_offset & 0x01) == 0x01) |
| 835 | { |
| 836 | if (sym_sec != NULL |
| 837 | && sym_sec->owner != NULL |
| 838 | && !INTERWORK_FLAG (sym_sec->owner)) |
| 839 | { |
| 840 | _bfd_error_handler |
| 841 | (_("%s(%s): warning: interworking not enabled."), |
| 842 | bfd_get_filename (sym_sec->owner), name); |
| 843 | _bfd_error_handler |
| 844 | (_(" first occurrence: %s: thumb call to arm"), |
| 845 | bfd_get_filename (input_bfd)); |
| 846 | |
| 847 | return false; |
| 848 | } |
| 849 | |
| 850 | --my_offset; |
| 851 | myh->root.u.def.value = my_offset; |
| 852 | |
| 853 | bfd_put_16 (output_bfd, t2a1_bx_pc_insn, |
| 854 | s->contents + my_offset); |
| 855 | |
| 856 | bfd_put_16 (output_bfd, t2a2_noop_insn, |
| 857 | s->contents + my_offset + 2); |
| 858 | |
| 859 | ret_offset = |
| 860 | /* Address of destination of the stub. */ |
| 861 | ((bfd_signed_vma) val) |
| 862 | - ((bfd_signed_vma) |
| 863 | /* Offset from the start of the current section to the start of the stubs. */ |
| 864 | (s->output_offset |
| 865 | /* Offset of the start of this stub from the start of the stubs. */ |
| 866 | + my_offset |
| 867 | /* Address of the start of the current section. */ |
| 868 | + s->output_section->vma) |
| 869 | /* The branch instruction is 4 bytes into the stub. */ |
| 870 | + 4 |
| 871 | /* ARM branches work from the pc of the instruction + 8. */ |
| 872 | + 8); |
| 873 | |
| 874 | bfd_put_32 (output_bfd, |
| 875 | t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), |
| 876 | s->contents + my_offset + 4); |
| 877 | } |
| 878 | |
| 879 | BFD_ASSERT (my_offset <= globals->thumb_glue_size); |
| 880 | |
| 881 | /* Now go back and fix up the original BL insn to point |
| 882 | to here. */ |
| 883 | ret_offset = |
| 884 | s->output_offset |
| 885 | + my_offset |
| 886 | - (input_section->output_offset |
| 887 | + offset + addend) |
| 888 | - 8; |
| 889 | |
| 890 | tmp = bfd_get_32 (input_bfd, hit_data |
| 891 | - input_section->vma); |
| 892 | |
| 893 | bfd_put_32 (output_bfd, |
| 894 | insert_thumb_branch (tmp, ret_offset), |
| 895 | hit_data - input_section->vma); |
| 896 | |
| 897 | return true; |
| 898 | } |
| 899 | |
| 900 | /* Arm code calling a Thumb function. */ |
| 901 | |
| 902 | static int |
| 903 | elf32_arm_to_thumb_stub (info, name, input_bfd, output_bfd, input_section, |
| 904 | hit_data, sym_sec, offset, addend, val) |
| 905 | struct bfd_link_info * info; |
| 906 | const char * name; |
| 907 | bfd * input_bfd; |
| 908 | bfd * output_bfd; |
| 909 | asection * input_section; |
| 910 | bfd_byte * hit_data; |
| 911 | asection * sym_sec; |
| 912 | bfd_vma offset; |
| 913 | bfd_signed_vma addend; |
| 914 | bfd_vma val; |
| 915 | { |
| 916 | unsigned long int tmp; |
| 917 | long int my_offset; |
| 918 | asection * s; |
| 919 | long int ret_offset; |
| 920 | struct elf_link_hash_entry * myh; |
| 921 | struct elf32_arm_link_hash_table * globals; |
| 922 | |
| 923 | myh = find_arm_glue (info, name, input_bfd); |
| 924 | if (myh == NULL) |
| 925 | return false; |
| 926 | |
| 927 | globals = elf32_arm_hash_table (info); |
| 928 | |
| 929 | BFD_ASSERT (globals != NULL); |
| 930 | BFD_ASSERT (globals->bfd_of_glue_owner != NULL); |
| 931 | |
| 932 | my_offset = myh->root.u.def.value; |
| 933 | s = bfd_get_section_by_name (globals->bfd_of_glue_owner, |
| 934 | ARM2THUMB_GLUE_SECTION_NAME); |
| 935 | BFD_ASSERT (s != NULL); |
| 936 | BFD_ASSERT (s->contents != NULL); |
| 937 | BFD_ASSERT (s->output_section != NULL); |
| 938 | |
| 939 | if ((my_offset & 0x01) == 0x01) |
| 940 | { |
| 941 | if (sym_sec != NULL |
| 942 | && sym_sec->owner != NULL |
| 943 | && !INTERWORK_FLAG (sym_sec->owner)) |
| 944 | { |
| 945 | _bfd_error_handler |
| 946 | (_("%s(%s): warning: interworking not enabled."), |
| 947 | bfd_get_filename (sym_sec->owner), name); |
| 948 | _bfd_error_handler |
| 949 | (_(" first occurrence: %s: arm call to thumb"), |
| 950 | bfd_get_filename (input_bfd)); |
| 951 | } |
| 952 | |
| 953 | --my_offset; |
| 954 | myh->root.u.def.value = my_offset; |
| 955 | |
| 956 | bfd_put_32 (output_bfd, a2t1_ldr_insn, |
| 957 | s->contents + my_offset); |
| 958 | |
| 959 | bfd_put_32 (output_bfd, a2t2_bx_r12_insn, |
| 960 | s->contents + my_offset + 4); |
| 961 | |
| 962 | /* It's a thumb address. Add the low order bit. */ |
| 963 | bfd_put_32 (output_bfd, val | a2t3_func_addr_insn, |
| 964 | s->contents + my_offset + 8); |
| 965 | } |
| 966 | |
| 967 | BFD_ASSERT (my_offset <= globals->arm_glue_size); |
| 968 | |
| 969 | tmp = bfd_get_32 (input_bfd, hit_data); |
| 970 | tmp = tmp & 0xFF000000; |
| 971 | |
| 972 | /* Somehow these are both 4 too far, so subtract 8. */ |
| 973 | ret_offset = s->output_offset |
| 974 | + my_offset |
| 975 | + s->output_section->vma |
| 976 | - (input_section->output_offset |
| 977 | + input_section->output_section->vma |
| 978 | + offset + addend) |
| 979 | - 8; |
| 980 | |
| 981 | tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); |
| 982 | |
| 983 | bfd_put_32 (output_bfd, tmp, hit_data |
| 984 | - input_section->vma); |
| 985 | |
| 986 | return true; |
| 987 | } |
| 988 | |
| 989 | /* Perform a relocation as part of a final link. */ |
| 990 | |
| 991 | static bfd_reloc_status_type |
| 992 | elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, |
| 993 | input_section, contents, rel, value, |
| 994 | info, sym_sec, sym_name, sym_flags, h) |
| 995 | reloc_howto_type * howto; |
| 996 | bfd * input_bfd; |
| 997 | bfd * output_bfd; |
| 998 | asection * input_section; |
| 999 | bfd_byte * contents; |
| 1000 | Elf_Internal_Rela * rel; |
| 1001 | bfd_vma value; |
| 1002 | struct bfd_link_info * info; |
| 1003 | asection * sym_sec; |
| 1004 | const char * sym_name; |
| 1005 | unsigned char sym_flags; |
| 1006 | struct elf_link_hash_entry * h; |
| 1007 | { |
| 1008 | unsigned long r_type = howto->type; |
| 1009 | unsigned long r_symndx; |
| 1010 | bfd_byte * hit_data = contents + rel->r_offset; |
| 1011 | bfd * dynobj = NULL; |
| 1012 | Elf_Internal_Shdr * symtab_hdr; |
| 1013 | struct elf_link_hash_entry ** sym_hashes; |
| 1014 | bfd_vma * local_got_offsets; |
| 1015 | asection * sgot = NULL; |
| 1016 | asection * splt = NULL; |
| 1017 | asection * sreloc = NULL; |
| 1018 | bfd_vma addend; |
| 1019 | bfd_signed_vma signed_addend; |
| 1020 | struct elf32_arm_link_hash_table * globals; |
| 1021 | |
| 1022 | globals = elf32_arm_hash_table (info); |
| 1023 | |
| 1024 | dynobj = elf_hash_table (info)->dynobj; |
| 1025 | if (dynobj) |
| 1026 | { |
| 1027 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 1028 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 1029 | } |
| 1030 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 1031 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1032 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 1033 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1034 | |
| 1035 | #ifdef USE_REL |
| 1036 | addend = bfd_get_32 (input_bfd, hit_data) & howto->src_mask; |
| 1037 | |
| 1038 | if (addend & ((howto->src_mask + 1) >> 1)) |
| 1039 | { |
| 1040 | signed_addend = -1; |
| 1041 | signed_addend &= ~ howto->src_mask; |
| 1042 | signed_addend |= addend; |
| 1043 | } |
| 1044 | else |
| 1045 | signed_addend = addend; |
| 1046 | #else |
| 1047 | addend = signed_addend = rel->r_addend; |
| 1048 | #endif |
| 1049 | |
| 1050 | switch (r_type) |
| 1051 | { |
| 1052 | case R_ARM_NONE: |
| 1053 | return bfd_reloc_ok; |
| 1054 | |
| 1055 | case R_ARM_PC24: |
| 1056 | case R_ARM_ABS32: |
| 1057 | case R_ARM_REL32: |
| 1058 | #ifndef OLD_ARM_ABI |
| 1059 | case R_ARM_XPC25: |
| 1060 | #endif |
| 1061 | /* When generating a shared object, these relocations are copied |
| 1062 | into the output file to be resolved at run time. */ |
| 1063 | if (info->shared |
| 1064 | && (r_type != R_ARM_PC24 |
| 1065 | || (h != NULL |
| 1066 | && h->dynindx != -1 |
| 1067 | && (! info->symbolic |
| 1068 | || (h->elf_link_hash_flags |
| 1069 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 1070 | { |
| 1071 | Elf_Internal_Rel outrel; |
| 1072 | boolean skip, relocate; |
| 1073 | |
| 1074 | if (sreloc == NULL) |
| 1075 | { |
| 1076 | const char * name; |
| 1077 | |
| 1078 | name = (bfd_elf_string_from_elf_section |
| 1079 | (input_bfd, |
| 1080 | elf_elfheader (input_bfd)->e_shstrndx, |
| 1081 | elf_section_data (input_section)->rel_hdr.sh_name)); |
| 1082 | if (name == NULL) |
| 1083 | return bfd_reloc_notsupported; |
| 1084 | |
| 1085 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 |
| 1086 | && strcmp (bfd_get_section_name (input_bfd, |
| 1087 | input_section), |
| 1088 | name + 4) == 0); |
| 1089 | |
| 1090 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 1091 | BFD_ASSERT (sreloc != NULL); |
| 1092 | } |
| 1093 | |
| 1094 | skip = false; |
| 1095 | |
| 1096 | if (elf_section_data (input_section)->stab_info == NULL) |
| 1097 | outrel.r_offset = rel->r_offset; |
| 1098 | else |
| 1099 | { |
| 1100 | bfd_vma off; |
| 1101 | |
| 1102 | off = (_bfd_stab_section_offset |
| 1103 | (output_bfd, &elf_hash_table (info)->stab_info, |
| 1104 | input_section, |
| 1105 | & elf_section_data (input_section)->stab_info, |
| 1106 | rel->r_offset)); |
| 1107 | if (off == (bfd_vma) -1) |
| 1108 | skip = true; |
| 1109 | outrel.r_offset = off; |
| 1110 | } |
| 1111 | |
| 1112 | outrel.r_offset += (input_section->output_section->vma |
| 1113 | + input_section->output_offset); |
| 1114 | |
| 1115 | if (skip) |
| 1116 | { |
| 1117 | memset (&outrel, 0, sizeof outrel); |
| 1118 | relocate = false; |
| 1119 | } |
| 1120 | else if (r_type == R_ARM_PC24) |
| 1121 | { |
| 1122 | BFD_ASSERT (h != NULL && h->dynindx != -1); |
| 1123 | if ((input_section->flags & SEC_ALLOC) != 0) |
| 1124 | relocate = false; |
| 1125 | else |
| 1126 | relocate = true; |
| 1127 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_PC24); |
| 1128 | } |
| 1129 | else |
| 1130 | { |
| 1131 | if (h == NULL |
| 1132 | || ((info->symbolic || h->dynindx == -1) |
| 1133 | && (h->elf_link_hash_flags |
| 1134 | & ELF_LINK_HASH_DEF_REGULAR) != 0)) |
| 1135 | { |
| 1136 | relocate = true; |
| 1137 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); |
| 1138 | } |
| 1139 | else |
| 1140 | { |
| 1141 | BFD_ASSERT (h->dynindx != -1); |
| 1142 | if ((input_section->flags & SEC_ALLOC) != 0) |
| 1143 | relocate = false; |
| 1144 | else |
| 1145 | relocate = true; |
| 1146 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_ABS32); |
| 1147 | } |
| 1148 | } |
| 1149 | |
| 1150 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, |
| 1151 | (((Elf32_External_Rel *) |
| 1152 | sreloc->contents) |
| 1153 | + sreloc->reloc_count)); |
| 1154 | ++sreloc->reloc_count; |
| 1155 | |
| 1156 | /* If this reloc is against an external symbol, we do not want to |
| 1157 | fiddle with the addend. Otherwise, we need to include the symbol |
| 1158 | value so that it becomes an addend for the dynamic reloc. */ |
| 1159 | if (! relocate) |
| 1160 | return bfd_reloc_ok; |
| 1161 | |
| 1162 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1163 | contents, rel->r_offset, value, |
| 1164 | (bfd_vma) 0); |
| 1165 | } |
| 1166 | else switch (r_type) |
| 1167 | { |
| 1168 | #ifndef OLD_ARM_ABI |
| 1169 | case R_ARM_XPC25: /* Arm BLX instruction. */ |
| 1170 | #endif |
| 1171 | case R_ARM_PC24: /* Arm B/BL instruction */ |
| 1172 | #ifndef OLD_ARM_ABI |
| 1173 | if (r_type == R_ARM_XPC25) |
| 1174 | { |
| 1175 | /* Check for Arm calling Arm function. */ |
| 1176 | /* FIXME: Should we translate the instruction into a BL |
| 1177 | instruction instead ? */ |
| 1178 | if (sym_flags != STT_ARM_TFUNC) |
| 1179 | _bfd_error_handler (_("\ |
| 1180 | %s: Warning: Arm BLX instruction targets Arm function '%s'."), |
| 1181 | bfd_get_filename (input_bfd), |
| 1182 | h ? h->root.root.string : "(local)"); |
| 1183 | } |
| 1184 | else |
| 1185 | #endif |
| 1186 | { |
| 1187 | /* Check for Arm calling Thumb function. */ |
| 1188 | if (sym_flags == STT_ARM_TFUNC) |
| 1189 | { |
| 1190 | elf32_arm_to_thumb_stub (info, sym_name, input_bfd, output_bfd, |
| 1191 | input_section, hit_data, sym_sec, rel->r_offset, |
| 1192 | signed_addend, value); |
| 1193 | return bfd_reloc_ok; |
| 1194 | } |
| 1195 | } |
| 1196 | |
| 1197 | if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 |
| 1198 | || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0) |
| 1199 | { |
| 1200 | /* The old way of doing things. Trearing the addend as a |
| 1201 | byte sized field and adding in the pipeline offset. */ |
| 1202 | value -= (input_section->output_section->vma |
| 1203 | + input_section->output_offset); |
| 1204 | value -= rel->r_offset; |
| 1205 | value += addend; |
| 1206 | |
| 1207 | if (! globals->no_pipeline_knowledge) |
| 1208 | value -= 8; |
| 1209 | } |
| 1210 | else |
| 1211 | { |
| 1212 | /* The ARM ELF ABI says that this reloc is computed as: S - P + A |
| 1213 | where: |
| 1214 | S is the address of the symbol in the relocation. |
| 1215 | P is address of the instruction being relocated. |
| 1216 | A is the addend (extracted from the instruction) in bytes. |
| 1217 | |
| 1218 | S is held in 'value'. |
| 1219 | P is the base address of the section containing the instruction |
| 1220 | plus the offset of the reloc into that section, ie: |
| 1221 | (input_section->output_section->vma + |
| 1222 | input_section->output_offset + |
| 1223 | rel->r_offset). |
| 1224 | A is the addend, converted into bytes, ie: |
| 1225 | (signed_addend * 4) |
| 1226 | |
| 1227 | Note: None of these operations have knowledge of the pipeline |
| 1228 | size of the processor, thus it is up to the assembler to encode |
| 1229 | this information into the addend. */ |
| 1230 | value -= (input_section->output_section->vma |
| 1231 | + input_section->output_offset); |
| 1232 | value -= rel->r_offset; |
| 1233 | value += (signed_addend << howto->size); |
| 1234 | |
| 1235 | /* Previous versions of this code also used to add in the pipeline |
| 1236 | offset here. This is wrong because the linker is not supposed |
| 1237 | to know about such things, and one day it might change. In order |
| 1238 | to support old binaries that need the old behaviour however, so |
| 1239 | we attempt to detect which ABI was used to create the reloc. */ |
| 1240 | if (! globals->no_pipeline_knowledge) |
| 1241 | { |
| 1242 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form */ |
| 1243 | |
| 1244 | i_ehdrp = elf_elfheader (input_bfd); |
| 1245 | |
| 1246 | if (i_ehdrp->e_ident[EI_OSABI] == 0) |
| 1247 | value -= 8; |
| 1248 | } |
| 1249 | } |
| 1250 | |
| 1251 | signed_addend = value; |
| 1252 | signed_addend >>= howto->rightshift; |
| 1253 | |
| 1254 | /* It is not an error for an undefined weak reference to be |
| 1255 | out of range. Any program that branches to such a symbol |
| 1256 | is going to crash anyway, so there is no point worrying |
| 1257 | about getting the destination exactly right. */ |
| 1258 | if (! h || h->root.type != bfd_link_hash_undefweak) |
| 1259 | { |
| 1260 | /* Perform a signed range check. */ |
| 1261 | if ( signed_addend > ((bfd_signed_vma) (howto->dst_mask >> 1)) |
| 1262 | || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1))) |
| 1263 | return bfd_reloc_overflow; |
| 1264 | } |
| 1265 | |
| 1266 | #ifndef OLD_ARM_ABI |
| 1267 | /* If necessary set the H bit in the BLX instruction. */ |
| 1268 | if (r_type == R_ARM_XPC25 && ((value & 2) == 2)) |
| 1269 | value = (signed_addend & howto->dst_mask) |
| 1270 | | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)) |
| 1271 | | (1 << 24); |
| 1272 | else |
| 1273 | #endif |
| 1274 | value = (signed_addend & howto->dst_mask) |
| 1275 | | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)); |
| 1276 | break; |
| 1277 | |
| 1278 | case R_ARM_ABS32: |
| 1279 | value += addend; |
| 1280 | if (sym_flags == STT_ARM_TFUNC) |
| 1281 | value |= 1; |
| 1282 | break; |
| 1283 | |
| 1284 | case R_ARM_REL32: |
| 1285 | value -= (input_section->output_section->vma |
| 1286 | + input_section->output_offset); |
| 1287 | value += addend; |
| 1288 | break; |
| 1289 | } |
| 1290 | |
| 1291 | bfd_put_32 (input_bfd, value, hit_data); |
| 1292 | return bfd_reloc_ok; |
| 1293 | |
| 1294 | case R_ARM_ABS8: |
| 1295 | value += addend; |
| 1296 | if ((long) value > 0x7f || (long) value < -0x80) |
| 1297 | return bfd_reloc_overflow; |
| 1298 | |
| 1299 | bfd_put_8 (input_bfd, value, hit_data); |
| 1300 | return bfd_reloc_ok; |
| 1301 | |
| 1302 | case R_ARM_ABS16: |
| 1303 | value += addend; |
| 1304 | |
| 1305 | if ((long) value > 0x7fff || (long) value < -0x8000) |
| 1306 | return bfd_reloc_overflow; |
| 1307 | |
| 1308 | bfd_put_16 (input_bfd, value, hit_data); |
| 1309 | return bfd_reloc_ok; |
| 1310 | |
| 1311 | case R_ARM_ABS12: |
| 1312 | /* Support ldr and str instruction for the arm */ |
| 1313 | /* Also thumb b (unconditional branch). ??? Really? */ |
| 1314 | value += addend; |
| 1315 | |
| 1316 | if ((long) value > 0x7ff || (long) value < -0x800) |
| 1317 | return bfd_reloc_overflow; |
| 1318 | |
| 1319 | value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000); |
| 1320 | bfd_put_32 (input_bfd, value, hit_data); |
| 1321 | return bfd_reloc_ok; |
| 1322 | |
| 1323 | case R_ARM_THM_ABS5: |
| 1324 | /* Support ldr and str instructions for the thumb. */ |
| 1325 | #ifdef USE_REL |
| 1326 | /* Need to refetch addend. */ |
| 1327 | addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; |
| 1328 | /* ??? Need to determine shift amount from operand size. */ |
| 1329 | addend >>= howto->rightshift; |
| 1330 | #endif |
| 1331 | value += addend; |
| 1332 | |
| 1333 | /* ??? Isn't value unsigned? */ |
| 1334 | if ((long) value > 0x1f || (long) value < -0x10) |
| 1335 | return bfd_reloc_overflow; |
| 1336 | |
| 1337 | /* ??? Value needs to be properly shifted into place first. */ |
| 1338 | value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f; |
| 1339 | bfd_put_16 (input_bfd, value, hit_data); |
| 1340 | return bfd_reloc_ok; |
| 1341 | |
| 1342 | #ifndef OLD_ARM_ABI |
| 1343 | case R_ARM_THM_XPC22: |
| 1344 | #endif |
| 1345 | case R_ARM_THM_PC22: |
| 1346 | /* Thumb BL (branch long instruction). */ |
| 1347 | { |
| 1348 | bfd_vma relocation; |
| 1349 | boolean overflow = false; |
| 1350 | bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); |
| 1351 | bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); |
| 1352 | bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; |
| 1353 | bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; |
| 1354 | bfd_vma check; |
| 1355 | bfd_signed_vma signed_check; |
| 1356 | |
| 1357 | #ifdef USE_REL |
| 1358 | /* Need to refetch the addend and squish the two 11 bit pieces |
| 1359 | together. */ |
| 1360 | { |
| 1361 | bfd_vma upper = upper_insn & 0x7ff; |
| 1362 | bfd_vma lower = lower_insn & 0x7ff; |
| 1363 | upper = (upper ^ 0x400) - 0x400; /* Sign extend. */ |
| 1364 | addend = (upper << 12) | (lower << 1); |
| 1365 | signed_addend = addend; |
| 1366 | } |
| 1367 | #endif |
| 1368 | #ifndef OLD_ARM_ABI |
| 1369 | if (r_type == R_ARM_THM_XPC22) |
| 1370 | { |
| 1371 | /* Check for Thumb to Thumb call. */ |
| 1372 | /* FIXME: Should we translate the instruction into a BL |
| 1373 | instruction instead ? */ |
| 1374 | if (sym_flags == STT_ARM_TFUNC) |
| 1375 | _bfd_error_handler (_("\ |
| 1376 | %s: Warning: Thumb BLX instruction targets thumb function '%s'."), |
| 1377 | bfd_get_filename (input_bfd), |
| 1378 | h ? h->root.root.string : "(local)"); |
| 1379 | } |
| 1380 | else |
| 1381 | #endif |
| 1382 | { |
| 1383 | /* If it is not a call to Thumb, assume call to Arm. |
| 1384 | If it is a call relative to a section name, then it is not a |
| 1385 | function call at all, but rather a long jump. */ |
| 1386 | if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION) |
| 1387 | { |
| 1388 | if (elf32_thumb_to_arm_stub |
| 1389 | (info, sym_name, input_bfd, output_bfd, input_section, |
| 1390 | hit_data, sym_sec, rel->r_offset, signed_addend, value)) |
| 1391 | return bfd_reloc_ok; |
| 1392 | else |
| 1393 | return bfd_reloc_dangerous; |
| 1394 | } |
| 1395 | } |
| 1396 | |
| 1397 | relocation = value + signed_addend; |
| 1398 | |
| 1399 | relocation -= (input_section->output_section->vma |
| 1400 | + input_section->output_offset |
| 1401 | + rel->r_offset); |
| 1402 | |
| 1403 | if (! globals->no_pipeline_knowledge) |
| 1404 | { |
| 1405 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form. */ |
| 1406 | |
| 1407 | i_ehdrp = elf_elfheader (input_bfd); |
| 1408 | |
| 1409 | /* Previous versions of this code also used to add in the pipline |
| 1410 | offset here. This is wrong because the linker is not supposed |
| 1411 | to know about such things, and one day it might change. In order |
| 1412 | to support old binaries that need the old behaviour however, so |
| 1413 | we attempt to detect which ABI was used to create the reloc. */ |
| 1414 | if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 |
| 1415 | || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0 |
| 1416 | || i_ehdrp->e_ident[EI_OSABI] == 0) |
| 1417 | relocation += 4; |
| 1418 | } |
| 1419 | |
| 1420 | check = relocation >> howto->rightshift; |
| 1421 | |
| 1422 | /* If this is a signed value, the rightshift just dropped |
| 1423 | leading 1 bits (assuming twos complement). */ |
| 1424 | if ((bfd_signed_vma) relocation >= 0) |
| 1425 | signed_check = check; |
| 1426 | else |
| 1427 | signed_check = check | ~((bfd_vma) -1 >> howto->rightshift); |
| 1428 | |
| 1429 | /* Assumes two's complement. */ |
| 1430 | if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) |
| 1431 | overflow = true; |
| 1432 | |
| 1433 | /* Put RELOCATION back into the insn. */ |
| 1434 | upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff); |
| 1435 | lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff); |
| 1436 | |
| 1437 | /* Put the relocated value back in the object file: */ |
| 1438 | bfd_put_16 (input_bfd, upper_insn, hit_data); |
| 1439 | bfd_put_16 (input_bfd, lower_insn, hit_data + 2); |
| 1440 | |
| 1441 | return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); |
| 1442 | } |
| 1443 | break; |
| 1444 | |
| 1445 | case R_ARM_GNU_VTINHERIT: |
| 1446 | case R_ARM_GNU_VTENTRY: |
| 1447 | return bfd_reloc_ok; |
| 1448 | |
| 1449 | case R_ARM_COPY: |
| 1450 | return bfd_reloc_notsupported; |
| 1451 | |
| 1452 | case R_ARM_GLOB_DAT: |
| 1453 | return bfd_reloc_notsupported; |
| 1454 | |
| 1455 | case R_ARM_JUMP_SLOT: |
| 1456 | return bfd_reloc_notsupported; |
| 1457 | |
| 1458 | case R_ARM_RELATIVE: |
| 1459 | return bfd_reloc_notsupported; |
| 1460 | |
| 1461 | case R_ARM_GOTOFF: |
| 1462 | /* Relocation is relative to the start of the |
| 1463 | global offset table. */ |
| 1464 | |
| 1465 | BFD_ASSERT (sgot != NULL); |
| 1466 | if (sgot == NULL) |
| 1467 | return bfd_reloc_notsupported; |
| 1468 | |
| 1469 | /* Note that sgot->output_offset is not involved in this |
| 1470 | calculation. We always want the start of .got. If we |
| 1471 | define _GLOBAL_OFFSET_TABLE in a different way, as is |
| 1472 | permitted by the ABI, we might have to change this |
| 1473 | calculation. */ |
| 1474 | value -= sgot->output_section->vma; |
| 1475 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1476 | contents, rel->r_offset, value, |
| 1477 | (bfd_vma) 0); |
| 1478 | |
| 1479 | case R_ARM_GOTPC: |
| 1480 | /* Use global offset table as symbol value. */ |
| 1481 | BFD_ASSERT (sgot != NULL); |
| 1482 | |
| 1483 | if (sgot == NULL) |
| 1484 | return bfd_reloc_notsupported; |
| 1485 | |
| 1486 | value = sgot->output_section->vma; |
| 1487 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1488 | contents, rel->r_offset, value, |
| 1489 | (bfd_vma) 0); |
| 1490 | |
| 1491 | case R_ARM_GOT32: |
| 1492 | /* Relocation is to the entry for this symbol in the |
| 1493 | global offset table. */ |
| 1494 | if (sgot == NULL) |
| 1495 | return bfd_reloc_notsupported; |
| 1496 | |
| 1497 | if (h != NULL) |
| 1498 | { |
| 1499 | bfd_vma off; |
| 1500 | |
| 1501 | off = h->got.offset; |
| 1502 | BFD_ASSERT (off != (bfd_vma) -1); |
| 1503 | |
| 1504 | if (!elf_hash_table (info)->dynamic_sections_created || |
| 1505 | (info->shared && (info->symbolic || h->dynindx == -1) |
| 1506 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
| 1507 | { |
| 1508 | /* This is actually a static link, or it is a -Bsymbolic link |
| 1509 | and the symbol is defined locally. We must initialize this |
| 1510 | entry in the global offset table. Since the offset must |
| 1511 | always be a multiple of 4, we use the least significant bit |
| 1512 | to record whether we have initialized it already. |
| 1513 | |
| 1514 | When doing a dynamic link, we create a .rel.got relocation |
| 1515 | entry to initialize the value. This is done in the |
| 1516 | finish_dynamic_symbol routine. */ |
| 1517 | if ((off & 1) != 0) |
| 1518 | off &= ~1; |
| 1519 | else |
| 1520 | { |
| 1521 | bfd_put_32 (output_bfd, value, sgot->contents + off); |
| 1522 | h->got.offset |= 1; |
| 1523 | } |
| 1524 | } |
| 1525 | |
| 1526 | value = sgot->output_offset + off; |
| 1527 | } |
| 1528 | else |
| 1529 | { |
| 1530 | bfd_vma off; |
| 1531 | |
| 1532 | BFD_ASSERT (local_got_offsets != NULL && |
| 1533 | local_got_offsets[r_symndx] != (bfd_vma) -1); |
| 1534 | |
| 1535 | off = local_got_offsets[r_symndx]; |
| 1536 | |
| 1537 | /* The offset must always be a multiple of 4. We use the |
| 1538 | least significant bit to record whether we have already |
| 1539 | generated the necessary reloc. */ |
| 1540 | if ((off & 1) != 0) |
| 1541 | off &= ~1; |
| 1542 | else |
| 1543 | { |
| 1544 | bfd_put_32 (output_bfd, value, sgot->contents + off); |
| 1545 | |
| 1546 | if (info->shared) |
| 1547 | { |
| 1548 | asection * srelgot; |
| 1549 | Elf_Internal_Rel outrel; |
| 1550 | |
| 1551 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); |
| 1552 | BFD_ASSERT (srelgot != NULL); |
| 1553 | |
| 1554 | outrel.r_offset = (sgot->output_section->vma |
| 1555 | + sgot->output_offset |
| 1556 | + off); |
| 1557 | outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); |
| 1558 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, |
| 1559 | (((Elf32_External_Rel *) |
| 1560 | srelgot->contents) |
| 1561 | + srelgot->reloc_count)); |
| 1562 | ++srelgot->reloc_count; |
| 1563 | } |
| 1564 | |
| 1565 | local_got_offsets[r_symndx] |= 1; |
| 1566 | } |
| 1567 | |
| 1568 | value = sgot->output_offset + off; |
| 1569 | } |
| 1570 | |
| 1571 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1572 | contents, rel->r_offset, value, |
| 1573 | (bfd_vma) 0); |
| 1574 | |
| 1575 | case R_ARM_PLT32: |
| 1576 | /* Relocation is to the entry for this symbol in the |
| 1577 | procedure linkage table. */ |
| 1578 | |
| 1579 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 1580 | without using the procedure linkage table. */ |
| 1581 | if (h == NULL) |
| 1582 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1583 | contents, rel->r_offset, value, |
| 1584 | (bfd_vma) 0); |
| 1585 | |
| 1586 | if (h->plt.offset == (bfd_vma) -1) |
| 1587 | /* We didn't make a PLT entry for this symbol. This |
| 1588 | happens when statically linking PIC code, or when |
| 1589 | using -Bsymbolic. */ |
| 1590 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1591 | contents, rel->r_offset, value, |
| 1592 | (bfd_vma) 0); |
| 1593 | |
| 1594 | BFD_ASSERT(splt != NULL); |
| 1595 | if (splt == NULL) |
| 1596 | return bfd_reloc_notsupported; |
| 1597 | |
| 1598 | value = (splt->output_section->vma |
| 1599 | + splt->output_offset |
| 1600 | + h->plt.offset); |
| 1601 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1602 | contents, rel->r_offset, value, |
| 1603 | (bfd_vma) 0); |
| 1604 | |
| 1605 | case R_ARM_SBREL32: |
| 1606 | return bfd_reloc_notsupported; |
| 1607 | |
| 1608 | case R_ARM_AMP_VCALL9: |
| 1609 | return bfd_reloc_notsupported; |
| 1610 | |
| 1611 | case R_ARM_RSBREL32: |
| 1612 | return bfd_reloc_notsupported; |
| 1613 | |
| 1614 | case R_ARM_THM_RPC22: |
| 1615 | return bfd_reloc_notsupported; |
| 1616 | |
| 1617 | case R_ARM_RREL32: |
| 1618 | return bfd_reloc_notsupported; |
| 1619 | |
| 1620 | case R_ARM_RABS32: |
| 1621 | return bfd_reloc_notsupported; |
| 1622 | |
| 1623 | case R_ARM_RPC24: |
| 1624 | return bfd_reloc_notsupported; |
| 1625 | |
| 1626 | case R_ARM_RBASE: |
| 1627 | return bfd_reloc_notsupported; |
| 1628 | |
| 1629 | default: |
| 1630 | return bfd_reloc_notsupported; |
| 1631 | } |
| 1632 | } |
| 1633 | |
| 1634 | #ifdef USE_REL |
| 1635 | /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */ |
| 1636 | static void |
| 1637 | arm_add_to_rel (abfd, address, howto, increment) |
| 1638 | bfd * abfd; |
| 1639 | bfd_byte * address; |
| 1640 | reloc_howto_type * howto; |
| 1641 | bfd_signed_vma increment; |
| 1642 | { |
| 1643 | bfd_signed_vma addend; |
| 1644 | |
| 1645 | if (howto->type == R_ARM_THM_PC22) |
| 1646 | { |
| 1647 | int upper_insn, lower_insn; |
| 1648 | int upper, lower; |
| 1649 | |
| 1650 | upper_insn = bfd_get_16 (abfd, address); |
| 1651 | lower_insn = bfd_get_16 (abfd, address + 2); |
| 1652 | upper = upper_insn & 0x7ff; |
| 1653 | lower = lower_insn & 0x7ff; |
| 1654 | |
| 1655 | addend = (upper << 12) | (lower << 1); |
| 1656 | addend += increment; |
| 1657 | addend >>= 1; |
| 1658 | |
| 1659 | upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff); |
| 1660 | lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff); |
| 1661 | |
| 1662 | bfd_put_16 (abfd, upper_insn, address); |
| 1663 | bfd_put_16 (abfd, lower_insn, address + 2); |
| 1664 | } |
| 1665 | else |
| 1666 | { |
| 1667 | bfd_vma contents; |
| 1668 | |
| 1669 | contents = bfd_get_32 (abfd, address); |
| 1670 | |
| 1671 | /* Get the (signed) value from the instruction. */ |
| 1672 | addend = contents & howto->src_mask; |
| 1673 | if (addend & ((howto->src_mask + 1) >> 1)) |
| 1674 | { |
| 1675 | bfd_signed_vma mask; |
| 1676 | |
| 1677 | mask = -1; |
| 1678 | mask &= ~ howto->src_mask; |
| 1679 | addend |= mask; |
| 1680 | } |
| 1681 | |
| 1682 | /* Add in the increment, (which is a byte value). */ |
| 1683 | switch (howto->type) |
| 1684 | { |
| 1685 | default: |
| 1686 | addend += increment; |
| 1687 | break; |
| 1688 | |
| 1689 | case R_ARM_PC24: |
| 1690 | addend <<= howto->size; |
| 1691 | addend += increment; |
| 1692 | |
| 1693 | /* Should we check for overflow here ? */ |
| 1694 | |
| 1695 | /* Drop any undesired bits. */ |
| 1696 | addend >>= howto->rightshift; |
| 1697 | break; |
| 1698 | } |
| 1699 | |
| 1700 | contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask); |
| 1701 | |
| 1702 | bfd_put_32 (abfd, contents, address); |
| 1703 | } |
| 1704 | } |
| 1705 | #endif /* USE_REL */ |
| 1706 | |
| 1707 | /* Relocate an ARM ELF section. */ |
| 1708 | static boolean |
| 1709 | elf32_arm_relocate_section (output_bfd, info, input_bfd, input_section, |
| 1710 | contents, relocs, local_syms, local_sections) |
| 1711 | bfd * output_bfd; |
| 1712 | struct bfd_link_info * info; |
| 1713 | bfd * input_bfd; |
| 1714 | asection * input_section; |
| 1715 | bfd_byte * contents; |
| 1716 | Elf_Internal_Rela * relocs; |
| 1717 | Elf_Internal_Sym * local_syms; |
| 1718 | asection ** local_sections; |
| 1719 | { |
| 1720 | Elf_Internal_Shdr * symtab_hdr; |
| 1721 | struct elf_link_hash_entry ** sym_hashes; |
| 1722 | Elf_Internal_Rela * rel; |
| 1723 | Elf_Internal_Rela * relend; |
| 1724 | const char * name; |
| 1725 | |
| 1726 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 1727 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1728 | |
| 1729 | rel = relocs; |
| 1730 | relend = relocs + input_section->reloc_count; |
| 1731 | for (; rel < relend; rel++) |
| 1732 | { |
| 1733 | int r_type; |
| 1734 | reloc_howto_type * howto; |
| 1735 | unsigned long r_symndx; |
| 1736 | Elf_Internal_Sym * sym; |
| 1737 | asection * sec; |
| 1738 | struct elf_link_hash_entry * h; |
| 1739 | bfd_vma relocation; |
| 1740 | bfd_reloc_status_type r; |
| 1741 | arelent bfd_reloc; |
| 1742 | |
| 1743 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1744 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1745 | |
| 1746 | if ( r_type == R_ARM_GNU_VTENTRY |
| 1747 | || r_type == R_ARM_GNU_VTINHERIT) |
| 1748 | continue; |
| 1749 | |
| 1750 | elf32_arm_info_to_howto (input_bfd, & bfd_reloc, rel); |
| 1751 | howto = bfd_reloc.howto; |
| 1752 | |
| 1753 | if (info->relocateable) |
| 1754 | { |
| 1755 | /* This is a relocateable link. We don't have to change |
| 1756 | anything, unless the reloc is against a section symbol, |
| 1757 | in which case we have to adjust according to where the |
| 1758 | section symbol winds up in the output section. */ |
| 1759 | if (r_symndx < symtab_hdr->sh_info) |
| 1760 | { |
| 1761 | sym = local_syms + r_symndx; |
| 1762 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 1763 | { |
| 1764 | sec = local_sections[r_symndx]; |
| 1765 | #ifdef USE_REL |
| 1766 | arm_add_to_rel (input_bfd, contents + rel->r_offset, |
| 1767 | howto, sec->output_offset + sym->st_value); |
| 1768 | #else |
| 1769 | rel->r_addend += (sec->output_offset + sym->st_value) |
| 1770 | >> howto->rightshift; |
| 1771 | #endif |
| 1772 | } |
| 1773 | } |
| 1774 | |
| 1775 | continue; |
| 1776 | } |
| 1777 | |
| 1778 | /* This is a final link. */ |
| 1779 | h = NULL; |
| 1780 | sym = NULL; |
| 1781 | sec = NULL; |
| 1782 | |
| 1783 | if (r_symndx < symtab_hdr->sh_info) |
| 1784 | { |
| 1785 | sym = local_syms + r_symndx; |
| 1786 | sec = local_sections[r_symndx]; |
| 1787 | relocation = (sec->output_section->vma |
| 1788 | + sec->output_offset |
| 1789 | + sym->st_value); |
| 1790 | } |
| 1791 | else |
| 1792 | { |
| 1793 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1794 | |
| 1795 | while ( h->root.type == bfd_link_hash_indirect |
| 1796 | || h->root.type == bfd_link_hash_warning) |
| 1797 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1798 | |
| 1799 | if ( h->root.type == bfd_link_hash_defined |
| 1800 | || h->root.type == bfd_link_hash_defweak) |
| 1801 | { |
| 1802 | int relocation_needed = 1; |
| 1803 | |
| 1804 | sec = h->root.u.def.section; |
| 1805 | |
| 1806 | /* In these cases, we don't need the relocation value. |
| 1807 | We check specially because in some obscure cases |
| 1808 | sec->output_section will be NULL. */ |
| 1809 | switch (r_type) |
| 1810 | { |
| 1811 | case R_ARM_PC24: |
| 1812 | case R_ARM_ABS32: |
| 1813 | if (info->shared |
| 1814 | && ( |
| 1815 | (!info->symbolic && h->dynindx != -1) |
| 1816 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 |
| 1817 | ) |
| 1818 | && ((input_section->flags & SEC_ALLOC) != 0 |
| 1819 | /* DWARF will emit R_ARM_ABS32 relocations in its |
| 1820 | sections against symbols defined externally |
| 1821 | in shared libraries. We can't do anything |
| 1822 | with them here. */ |
| 1823 | || ((input_section->flags & SEC_DEBUGGING) != 0 |
| 1824 | && (h->elf_link_hash_flags |
| 1825 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) |
| 1826 | ) |
| 1827 | relocation_needed = 0; |
| 1828 | break; |
| 1829 | |
| 1830 | case R_ARM_GOTPC: |
| 1831 | relocation_needed = 0; |
| 1832 | break; |
| 1833 | |
| 1834 | case R_ARM_GOT32: |
| 1835 | if (elf_hash_table(info)->dynamic_sections_created |
| 1836 | && (!info->shared |
| 1837 | || (!info->symbolic && h->dynindx != -1) |
| 1838 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 |
| 1839 | ) |
| 1840 | ) |
| 1841 | relocation_needed = 0; |
| 1842 | break; |
| 1843 | |
| 1844 | case R_ARM_PLT32: |
| 1845 | if (h->plt.offset != (bfd_vma)-1) |
| 1846 | relocation_needed = 0; |
| 1847 | break; |
| 1848 | |
| 1849 | default: |
| 1850 | if (sec->output_section == NULL) |
| 1851 | { |
| 1852 | (*_bfd_error_handler) |
| 1853 | (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), |
| 1854 | bfd_get_filename (input_bfd), h->root.root.string, |
| 1855 | bfd_get_section_name (input_bfd, input_section)); |
| 1856 | relocation_needed = 0; |
| 1857 | } |
| 1858 | } |
| 1859 | |
| 1860 | if (relocation_needed) |
| 1861 | relocation = h->root.u.def.value |
| 1862 | + sec->output_section->vma |
| 1863 | + sec->output_offset; |
| 1864 | else |
| 1865 | relocation = 0; |
| 1866 | } |
| 1867 | else if (h->root.type == bfd_link_hash_undefweak) |
| 1868 | relocation = 0; |
| 1869 | else if (info->shared && !info->symbolic |
| 1870 | && !info->no_undefined |
| 1871 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| 1872 | relocation = 0; |
| 1873 | else |
| 1874 | { |
| 1875 | if (!((*info->callbacks->undefined_symbol) |
| 1876 | (info, h->root.root.string, input_bfd, |
| 1877 | input_section, rel->r_offset, |
| 1878 | (!info->shared || info->no_undefined |
| 1879 | || ELF_ST_VISIBILITY (h->other))))) |
| 1880 | return false; |
| 1881 | relocation = 0; |
| 1882 | } |
| 1883 | } |
| 1884 | |
| 1885 | if (h != NULL) |
| 1886 | name = h->root.root.string; |
| 1887 | else |
| 1888 | { |
| 1889 | name = (bfd_elf_string_from_elf_section |
| 1890 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); |
| 1891 | if (name == NULL || *name == '\0') |
| 1892 | name = bfd_section_name (input_bfd, sec); |
| 1893 | } |
| 1894 | |
| 1895 | r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, |
| 1896 | input_section, contents, rel, |
| 1897 | relocation, info, sec, name, |
| 1898 | (h ? ELF_ST_TYPE (h->type) : |
| 1899 | ELF_ST_TYPE (sym->st_info)), h); |
| 1900 | |
| 1901 | if (r != bfd_reloc_ok) |
| 1902 | { |
| 1903 | const char * msg = (const char *) 0; |
| 1904 | |
| 1905 | switch (r) |
| 1906 | { |
| 1907 | case bfd_reloc_overflow: |
| 1908 | /* If the overflowing reloc was to an undefined symbol, |
| 1909 | we have already printed one error message and there |
| 1910 | is no point complaining again. */ |
| 1911 | if ((! h || |
| 1912 | h->root.type != bfd_link_hash_undefined) |
| 1913 | && (!((*info->callbacks->reloc_overflow) |
| 1914 | (info, name, howto->name, (bfd_vma) 0, |
| 1915 | input_bfd, input_section, rel->r_offset)))) |
| 1916 | return false; |
| 1917 | break; |
| 1918 | |
| 1919 | case bfd_reloc_undefined: |
| 1920 | if (!((*info->callbacks->undefined_symbol) |
| 1921 | (info, name, input_bfd, input_section, |
| 1922 | rel->r_offset, true))) |
| 1923 | return false; |
| 1924 | break; |
| 1925 | |
| 1926 | case bfd_reloc_outofrange: |
| 1927 | msg = _("internal error: out of range error"); |
| 1928 | goto common_error; |
| 1929 | |
| 1930 | case bfd_reloc_notsupported: |
| 1931 | msg = _("internal error: unsupported relocation error"); |
| 1932 | goto common_error; |
| 1933 | |
| 1934 | case bfd_reloc_dangerous: |
| 1935 | msg = _("internal error: dangerous error"); |
| 1936 | goto common_error; |
| 1937 | |
| 1938 | default: |
| 1939 | msg = _("internal error: unknown error"); |
| 1940 | /* fall through */ |
| 1941 | |
| 1942 | common_error: |
| 1943 | if (!((*info->callbacks->warning) |
| 1944 | (info, msg, name, input_bfd, input_section, |
| 1945 | rel->r_offset))) |
| 1946 | return false; |
| 1947 | break; |
| 1948 | } |
| 1949 | } |
| 1950 | } |
| 1951 | |
| 1952 | return true; |
| 1953 | } |
| 1954 | |
| 1955 | /* Function to keep ARM specific flags in the ELF header. */ |
| 1956 | static boolean |
| 1957 | elf32_arm_set_private_flags (abfd, flags) |
| 1958 | bfd *abfd; |
| 1959 | flagword flags; |
| 1960 | { |
| 1961 | if (elf_flags_init (abfd) |
| 1962 | && elf_elfheader (abfd)->e_flags != flags) |
| 1963 | { |
| 1964 | if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN) |
| 1965 | { |
| 1966 | if (flags & EF_INTERWORK) |
| 1967 | _bfd_error_handler (_("\ |
| 1968 | Warning: Not setting interwork flag of %s since it has already been specified as non-interworking"), |
| 1969 | bfd_get_filename (abfd)); |
| 1970 | else |
| 1971 | _bfd_error_handler (_("\ |
| 1972 | Warning: Clearing the interwork flag of %s due to outside request"), |
| 1973 | bfd_get_filename (abfd)); |
| 1974 | } |
| 1975 | } |
| 1976 | else |
| 1977 | { |
| 1978 | elf_elfheader (abfd)->e_flags = flags; |
| 1979 | elf_flags_init (abfd) = true; |
| 1980 | } |
| 1981 | |
| 1982 | return true; |
| 1983 | } |
| 1984 | |
| 1985 | /* Copy backend specific data from one object module to another. */ |
| 1986 | |
| 1987 | static boolean |
| 1988 | elf32_arm_copy_private_bfd_data (ibfd, obfd) |
| 1989 | bfd *ibfd; |
| 1990 | bfd *obfd; |
| 1991 | { |
| 1992 | flagword in_flags; |
| 1993 | flagword out_flags; |
| 1994 | |
| 1995 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 1996 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 1997 | return true; |
| 1998 | |
| 1999 | in_flags = elf_elfheader (ibfd)->e_flags; |
| 2000 | out_flags = elf_elfheader (obfd)->e_flags; |
| 2001 | |
| 2002 | if (elf_flags_init (obfd) |
| 2003 | && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN |
| 2004 | && in_flags != out_flags) |
| 2005 | { |
| 2006 | /* Cannot mix APCS26 and APCS32 code. */ |
| 2007 | if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) |
| 2008 | return false; |
| 2009 | |
| 2010 | /* Cannot mix float APCS and non-float APCS code. */ |
| 2011 | if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) |
| 2012 | return false; |
| 2013 | |
| 2014 | /* If the src and dest have different interworking flags |
| 2015 | then turn off the interworking bit. */ |
| 2016 | if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) |
| 2017 | { |
| 2018 | if (out_flags & EF_INTERWORK) |
| 2019 | _bfd_error_handler (_("\ |
| 2020 | Warning: Clearing the interwork flag in %s because non-interworking code in %s has been linked with it"), |
| 2021 | bfd_get_filename (obfd), bfd_get_filename (ibfd)); |
| 2022 | |
| 2023 | in_flags &= ~EF_INTERWORK; |
| 2024 | } |
| 2025 | |
| 2026 | /* Likewise for PIC, though don't warn for this case. */ |
| 2027 | if ((in_flags & EF_PIC) != (out_flags & EF_PIC)) |
| 2028 | in_flags &= ~EF_PIC; |
| 2029 | } |
| 2030 | |
| 2031 | elf_elfheader (obfd)->e_flags = in_flags; |
| 2032 | elf_flags_init (obfd) = true; |
| 2033 | |
| 2034 | return true; |
| 2035 | } |
| 2036 | |
| 2037 | /* Merge backend specific data from an object file to the output |
| 2038 | object file when linking. */ |
| 2039 | |
| 2040 | static boolean |
| 2041 | elf32_arm_merge_private_bfd_data (ibfd, obfd) |
| 2042 | bfd * ibfd; |
| 2043 | bfd * obfd; |
| 2044 | { |
| 2045 | flagword out_flags; |
| 2046 | flagword in_flags; |
| 2047 | boolean flags_compatible = true; |
| 2048 | boolean null_input_bfd = true; |
| 2049 | asection *sec; |
| 2050 | |
| 2051 | /* Check if we have the same endianess. */ |
| 2052 | if (_bfd_generic_verify_endian_match (ibfd, obfd) == false) |
| 2053 | return false; |
| 2054 | |
| 2055 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 2056 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 2057 | return true; |
| 2058 | |
| 2059 | /* The input BFD must have had its flags initialised. */ |
| 2060 | /* The following seems bogus to me -- The flags are initialized in |
| 2061 | the assembler but I don't think an elf_flags_init field is |
| 2062 | written into the object. */ |
| 2063 | /* BFD_ASSERT (elf_flags_init (ibfd)); */ |
| 2064 | |
| 2065 | in_flags = elf_elfheader (ibfd)->e_flags; |
| 2066 | out_flags = elf_elfheader (obfd)->e_flags; |
| 2067 | |
| 2068 | if (!elf_flags_init (obfd)) |
| 2069 | { |
| 2070 | /* If the input is the default architecture and had the default |
| 2071 | flags then do not bother setting the flags for the output |
| 2072 | architecture, instead allow future merges to do this. If no |
| 2073 | future merges ever set these flags then they will retain their |
| 2074 | uninitialised values, which surprise surprise, correspond |
| 2075 | to the default values. */ |
| 2076 | if (bfd_get_arch_info (ibfd)->the_default |
| 2077 | && elf_elfheader (ibfd)->e_flags == 0) |
| 2078 | return true; |
| 2079 | |
| 2080 | elf_flags_init (obfd) = true; |
| 2081 | elf_elfheader (obfd)->e_flags = in_flags; |
| 2082 | |
| 2083 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) |
| 2084 | && bfd_get_arch_info (obfd)->the_default) |
| 2085 | return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); |
| 2086 | |
| 2087 | return true; |
| 2088 | } |
| 2089 | |
| 2090 | /* Identical flags must be compatible. */ |
| 2091 | if (in_flags == out_flags) |
| 2092 | return true; |
| 2093 | |
| 2094 | /* Check to see if the input BFD actually contains any sections. |
| 2095 | If not, its flags may not have been initialised either, but it cannot |
| 2096 | actually cause any incompatibility. */ |
| 2097 | for (sec = ibfd->sections; sec != NULL; sec = sec->next) |
| 2098 | { |
| 2099 | /* Ignore synthetic glue sections. */ |
| 2100 | if (strcmp (sec->name, ".glue_7") |
| 2101 | && strcmp (sec->name, ".glue_7t")) |
| 2102 | { |
| 2103 | null_input_bfd = false; |
| 2104 | break; |
| 2105 | } |
| 2106 | } |
| 2107 | if (null_input_bfd) |
| 2108 | return true; |
| 2109 | |
| 2110 | /* Complain about various flag mismatches. */ |
| 2111 | if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_VERSION (out_flags)) |
| 2112 | { |
| 2113 | _bfd_error_handler (_("\ |
| 2114 | Error: %s compiled for EABI version %d, whereas %s is compiled for version %d"), |
| 2115 | bfd_get_filename (ibfd), |
| 2116 | (in_flags & EF_ARM_EABIMASK) >> 24, |
| 2117 | bfd_get_filename (obfd), |
| 2118 | (out_flags & EF_ARM_EABIMASK) >> 24); |
| 2119 | return false; |
| 2120 | } |
| 2121 | |
| 2122 | /* Not sure what needs to be checked for EABI versions >= 1. */ |
| 2123 | if (EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN) |
| 2124 | { |
| 2125 | if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) |
| 2126 | { |
| 2127 | _bfd_error_handler (_("\ |
| 2128 | Error: %s compiled for APCS-%d, whereas %s is compiled for APCS-%d"), |
| 2129 | bfd_get_filename (ibfd), |
| 2130 | in_flags & EF_APCS_26 ? 26 : 32, |
| 2131 | bfd_get_filename (obfd), |
| 2132 | out_flags & EF_APCS_26 ? 26 : 32); |
| 2133 | flags_compatible = false; |
| 2134 | } |
| 2135 | |
| 2136 | if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) |
| 2137 | { |
| 2138 | _bfd_error_handler (_("\ |
| 2139 | Error: %s passes floats in %s registers, whereas %s passes them in %s registers"), |
| 2140 | bfd_get_filename (ibfd), |
| 2141 | in_flags & EF_APCS_FLOAT ? _("float") : _("integer"), |
| 2142 | bfd_get_filename (obfd), |
| 2143 | out_flags & EF_APCS_26 ? _("float") : _("integer")); |
| 2144 | flags_compatible = false; |
| 2145 | } |
| 2146 | |
| 2147 | #ifdef EF_SOFT_FLOAT |
| 2148 | if ((in_flags & EF_SOFT_FLOAT) != (out_flags & EF_SOFT_FLOAT)) |
| 2149 | { |
| 2150 | _bfd_error_handler (_ ("\ |
| 2151 | Error: %s uses %s floating point, whereas %s uses %s floating point"), |
| 2152 | bfd_get_filename (ibfd), |
| 2153 | in_flags & EF_SOFT_FLOAT ? _("soft") : _("hard"), |
| 2154 | bfd_get_filename (obfd), |
| 2155 | out_flags & EF_SOFT_FLOAT ? _("soft") : _("hard")); |
| 2156 | flags_compatible = false; |
| 2157 | } |
| 2158 | #endif |
| 2159 | |
| 2160 | /* Interworking mismatch is only a warning. */ |
| 2161 | if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) |
| 2162 | _bfd_error_handler (_("\ |
| 2163 | Warning: %s %s interworking, whereas %s %s"), |
| 2164 | bfd_get_filename (ibfd), |
| 2165 | in_flags & EF_INTERWORK ? _("supports") : _("does not support"), |
| 2166 | bfd_get_filename (obfd), |
| 2167 | out_flags & EF_INTERWORK ? _("does not") : _("does")); |
| 2168 | } |
| 2169 | |
| 2170 | return flags_compatible; |
| 2171 | } |
| 2172 | |
| 2173 | /* Display the flags field. */ |
| 2174 | |
| 2175 | static boolean |
| 2176 | elf32_arm_print_private_bfd_data (abfd, ptr) |
| 2177 | bfd *abfd; |
| 2178 | PTR ptr; |
| 2179 | { |
| 2180 | FILE * file = (FILE *) ptr; |
| 2181 | unsigned long flags; |
| 2182 | |
| 2183 | BFD_ASSERT (abfd != NULL && ptr != NULL); |
| 2184 | |
| 2185 | /* Print normal ELF private data. */ |
| 2186 | _bfd_elf_print_private_bfd_data (abfd, ptr); |
| 2187 | |
| 2188 | flags = elf_elfheader (abfd)->e_flags; |
| 2189 | /* Ignore init flag - it may not be set, despite the flags field |
| 2190 | containing valid data. */ |
| 2191 | |
| 2192 | /* xgettext:c-format */ |
| 2193 | fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); |
| 2194 | |
| 2195 | switch (EF_ARM_EABI_VERSION (flags)) |
| 2196 | { |
| 2197 | case EF_ARM_EABI_UNKNOWN: |
| 2198 | /* The following flag bits are GNU extenstions and not part of the |
| 2199 | official ARM ELF extended ABI. Hence they are only decoded if |
| 2200 | the EABI version is not set. */ |
| 2201 | if (flags & EF_INTERWORK) |
| 2202 | fprintf (file, _(" [interworking enabled]")); |
| 2203 | |
| 2204 | if (flags & EF_APCS_26) |
| 2205 | fprintf (file, _(" [APCS-26]")); |
| 2206 | else |
| 2207 | fprintf (file, _(" [APCS-32]")); |
| 2208 | |
| 2209 | if (flags & EF_APCS_FLOAT) |
| 2210 | fprintf (file, _(" [floats passed in float registers]")); |
| 2211 | |
| 2212 | if (flags & EF_PIC) |
| 2213 | fprintf (file, _(" [position independent]")); |
| 2214 | |
| 2215 | if (flags & EF_NEW_ABI) |
| 2216 | fprintf (file, _(" [new ABI]")); |
| 2217 | |
| 2218 | if (flags & EF_OLD_ABI) |
| 2219 | fprintf (file, _(" [old ABI]")); |
| 2220 | |
| 2221 | if (flags & EF_SOFT_FLOAT) |
| 2222 | fprintf (file, _(" [software FP]")); |
| 2223 | |
| 2224 | flags &= ~(EF_INTERWORK | EF_APCS_26 | EF_APCS_FLOAT | EF_PIC |
| 2225 | | EF_NEW_ABI | EF_OLD_ABI | EF_SOFT_FLOAT); |
| 2226 | break; |
| 2227 | |
| 2228 | case EF_ARM_EABI_VER1: |
| 2229 | fprintf (file, _(" [Version1 EABI]")); |
| 2230 | |
| 2231 | if (flags & EF_ARM_SYMSARESORTED) |
| 2232 | fprintf (file, _(" [sorted symbol table]")); |
| 2233 | else |
| 2234 | fprintf (file, _(" [unsorted symbol table]")); |
| 2235 | |
| 2236 | flags &= ~ EF_ARM_SYMSARESORTED; |
| 2237 | break; |
| 2238 | |
| 2239 | default: |
| 2240 | fprintf (file, _(" <EABI version unrecognised>")); |
| 2241 | break; |
| 2242 | } |
| 2243 | |
| 2244 | flags &= ~ EF_ARM_EABIMASK; |
| 2245 | |
| 2246 | if (flags & EF_ARM_RELEXEC) |
| 2247 | fprintf (file, _(" [relocatable executable]")); |
| 2248 | |
| 2249 | if (flags & EF_ARM_HASENTRY) |
| 2250 | fprintf (file, _(" [has entry point]")); |
| 2251 | |
| 2252 | flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY); |
| 2253 | |
| 2254 | if (flags) |
| 2255 | fprintf (file, _("<Unrecognised flag bits set>")); |
| 2256 | |
| 2257 | fputc ('\n', file); |
| 2258 | |
| 2259 | return true; |
| 2260 | } |
| 2261 | |
| 2262 | static int |
| 2263 | elf32_arm_get_symbol_type (elf_sym, type) |
| 2264 | Elf_Internal_Sym * elf_sym; |
| 2265 | int type; |
| 2266 | { |
| 2267 | switch (ELF_ST_TYPE (elf_sym->st_info)) |
| 2268 | { |
| 2269 | case STT_ARM_TFUNC: |
| 2270 | return ELF_ST_TYPE (elf_sym->st_info); |
| 2271 | |
| 2272 | case STT_ARM_16BIT: |
| 2273 | /* If the symbol is not an object, return the STT_ARM_16BIT flag. |
| 2274 | This allows us to distinguish between data used by Thumb instructions |
| 2275 | and non-data (which is probably code) inside Thumb regions of an |
| 2276 | executable. */ |
| 2277 | if (type != STT_OBJECT) |
| 2278 | return ELF_ST_TYPE (elf_sym->st_info); |
| 2279 | break; |
| 2280 | |
| 2281 | default: |
| 2282 | break; |
| 2283 | } |
| 2284 | |
| 2285 | return type; |
| 2286 | } |
| 2287 | |
| 2288 | static asection * |
| 2289 | elf32_arm_gc_mark_hook (abfd, info, rel, h, sym) |
| 2290 | bfd *abfd; |
| 2291 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 2292 | Elf_Internal_Rela *rel; |
| 2293 | struct elf_link_hash_entry *h; |
| 2294 | Elf_Internal_Sym *sym; |
| 2295 | { |
| 2296 | if (h != NULL) |
| 2297 | { |
| 2298 | switch (ELF32_R_TYPE (rel->r_info)) |
| 2299 | { |
| 2300 | case R_ARM_GNU_VTINHERIT: |
| 2301 | case R_ARM_GNU_VTENTRY: |
| 2302 | break; |
| 2303 | |
| 2304 | default: |
| 2305 | switch (h->root.type) |
| 2306 | { |
| 2307 | case bfd_link_hash_defined: |
| 2308 | case bfd_link_hash_defweak: |
| 2309 | return h->root.u.def.section; |
| 2310 | |
| 2311 | case bfd_link_hash_common: |
| 2312 | return h->root.u.c.p->section; |
| 2313 | |
| 2314 | default: |
| 2315 | break; |
| 2316 | } |
| 2317 | } |
| 2318 | } |
| 2319 | else |
| 2320 | { |
| 2321 | if (!(elf_bad_symtab (abfd) |
| 2322 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) |
| 2323 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) |
| 2324 | && sym->st_shndx != SHN_COMMON)) |
| 2325 | { |
| 2326 | return bfd_section_from_elf_index (abfd, sym->st_shndx); |
| 2327 | } |
| 2328 | } |
| 2329 | return NULL; |
| 2330 | } |
| 2331 | |
| 2332 | /* Update the got entry reference counts for the section being removed. */ |
| 2333 | |
| 2334 | static boolean |
| 2335 | elf32_arm_gc_sweep_hook (abfd, info, sec, relocs) |
| 2336 | bfd *abfd ATTRIBUTE_UNUSED; |
| 2337 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 2338 | asection *sec ATTRIBUTE_UNUSED; |
| 2339 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; |
| 2340 | { |
| 2341 | /* We don't support garbage collection of GOT and PLT relocs yet. */ |
| 2342 | return true; |
| 2343 | } |
| 2344 | |
| 2345 | /* Look through the relocs for a section during the first phase. */ |
| 2346 | |
| 2347 | static boolean |
| 2348 | elf32_arm_check_relocs (abfd, info, sec, relocs) |
| 2349 | bfd * abfd; |
| 2350 | struct bfd_link_info * info; |
| 2351 | asection * sec; |
| 2352 | const Elf_Internal_Rela * relocs; |
| 2353 | { |
| 2354 | Elf_Internal_Shdr * symtab_hdr; |
| 2355 | struct elf_link_hash_entry ** sym_hashes; |
| 2356 | struct elf_link_hash_entry ** sym_hashes_end; |
| 2357 | const Elf_Internal_Rela * rel; |
| 2358 | const Elf_Internal_Rela * rel_end; |
| 2359 | bfd * dynobj; |
| 2360 | asection * sgot, *srelgot, *sreloc; |
| 2361 | bfd_vma * local_got_offsets; |
| 2362 | |
| 2363 | if (info->relocateable) |
| 2364 | return true; |
| 2365 | |
| 2366 | sgot = srelgot = sreloc = NULL; |
| 2367 | |
| 2368 | dynobj = elf_hash_table (info)->dynobj; |
| 2369 | local_got_offsets = elf_local_got_offsets (abfd); |
| 2370 | |
| 2371 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2372 | sym_hashes = elf_sym_hashes (abfd); |
| 2373 | sym_hashes_end = sym_hashes |
| 2374 | + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); |
| 2375 | |
| 2376 | if (!elf_bad_symtab (abfd)) |
| 2377 | sym_hashes_end -= symtab_hdr->sh_info; |
| 2378 | |
| 2379 | rel_end = relocs + sec->reloc_count; |
| 2380 | for (rel = relocs; rel < rel_end; rel++) |
| 2381 | { |
| 2382 | struct elf_link_hash_entry *h; |
| 2383 | unsigned long r_symndx; |
| 2384 | |
| 2385 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2386 | if (r_symndx < symtab_hdr->sh_info) |
| 2387 | h = NULL; |
| 2388 | else |
| 2389 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 2390 | |
| 2391 | /* Some relocs require a global offset table. */ |
| 2392 | if (dynobj == NULL) |
| 2393 | { |
| 2394 | switch (ELF32_R_TYPE (rel->r_info)) |
| 2395 | { |
| 2396 | case R_ARM_GOT32: |
| 2397 | case R_ARM_GOTOFF: |
| 2398 | case R_ARM_GOTPC: |
| 2399 | elf_hash_table (info)->dynobj = dynobj = abfd; |
| 2400 | if (! _bfd_elf_create_got_section (dynobj, info)) |
| 2401 | return false; |
| 2402 | break; |
| 2403 | |
| 2404 | default: |
| 2405 | break; |
| 2406 | } |
| 2407 | } |
| 2408 | |
| 2409 | switch (ELF32_R_TYPE (rel->r_info)) |
| 2410 | { |
| 2411 | case R_ARM_GOT32: |
| 2412 | /* This symbol requires a global offset table entry. */ |
| 2413 | if (sgot == NULL) |
| 2414 | { |
| 2415 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 2416 | BFD_ASSERT (sgot != NULL); |
| 2417 | } |
| 2418 | |
| 2419 | /* Get the got relocation section if necessary. */ |
| 2420 | if (srelgot == NULL |
| 2421 | && (h != NULL || info->shared)) |
| 2422 | { |
| 2423 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); |
| 2424 | |
| 2425 | /* If no got relocation section, make one and initialize. */ |
| 2426 | if (srelgot == NULL) |
| 2427 | { |
| 2428 | srelgot = bfd_make_section (dynobj, ".rel.got"); |
| 2429 | if (srelgot == NULL |
| 2430 | || ! bfd_set_section_flags (dynobj, srelgot, |
| 2431 | (SEC_ALLOC |
| 2432 | | SEC_LOAD |
| 2433 | | SEC_HAS_CONTENTS |
| 2434 | | SEC_IN_MEMORY |
| 2435 | | SEC_LINKER_CREATED |
| 2436 | | SEC_READONLY)) |
| 2437 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) |
| 2438 | return false; |
| 2439 | } |
| 2440 | } |
| 2441 | |
| 2442 | if (h != NULL) |
| 2443 | { |
| 2444 | if (h->got.offset != (bfd_vma) -1) |
| 2445 | /* We have already allocated space in the .got. */ |
| 2446 | break; |
| 2447 | |
| 2448 | h->got.offset = sgot->_raw_size; |
| 2449 | |
| 2450 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 2451 | if (h->dynindx == -1) |
| 2452 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 2453 | return false; |
| 2454 | |
| 2455 | srelgot->_raw_size += sizeof (Elf32_External_Rel); |
| 2456 | } |
| 2457 | else |
| 2458 | { |
| 2459 | /* This is a global offset table entry for a local |
| 2460 | symbol. */ |
| 2461 | if (local_got_offsets == NULL) |
| 2462 | { |
| 2463 | size_t size; |
| 2464 | register unsigned int i; |
| 2465 | |
| 2466 | size = symtab_hdr->sh_info * sizeof (bfd_vma); |
| 2467 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); |
| 2468 | if (local_got_offsets == NULL) |
| 2469 | return false; |
| 2470 | elf_local_got_offsets (abfd) = local_got_offsets; |
| 2471 | for (i = 0; i < symtab_hdr->sh_info; i++) |
| 2472 | local_got_offsets[i] = (bfd_vma) -1; |
| 2473 | } |
| 2474 | |
| 2475 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) |
| 2476 | /* We have already allocated space in the .got. */ |
| 2477 | break; |
| 2478 | |
| 2479 | local_got_offsets[r_symndx] = sgot->_raw_size; |
| 2480 | |
| 2481 | if (info->shared) |
| 2482 | /* If we are generating a shared object, we need to |
| 2483 | output a R_ARM_RELATIVE reloc so that the dynamic |
| 2484 | linker can adjust this GOT entry. */ |
| 2485 | srelgot->_raw_size += sizeof (Elf32_External_Rel); |
| 2486 | } |
| 2487 | |
| 2488 | sgot->_raw_size += 4; |
| 2489 | break; |
| 2490 | |
| 2491 | case R_ARM_PLT32: |
| 2492 | /* This symbol requires a procedure linkage table entry. We |
| 2493 | actually build the entry in adjust_dynamic_symbol, |
| 2494 | because this might be a case of linking PIC code which is |
| 2495 | never referenced by a dynamic object, in which case we |
| 2496 | don't need to generate a procedure linkage table entry |
| 2497 | after all. */ |
| 2498 | |
| 2499 | /* If this is a local symbol, we resolve it directly without |
| 2500 | creating a procedure linkage table entry. */ |
| 2501 | if (h == NULL) |
| 2502 | continue; |
| 2503 | |
| 2504 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| 2505 | break; |
| 2506 | |
| 2507 | case R_ARM_ABS32: |
| 2508 | case R_ARM_REL32: |
| 2509 | case R_ARM_PC24: |
| 2510 | /* If we are creating a shared library, and this is a reloc |
| 2511 | against a global symbol, or a non PC relative reloc |
| 2512 | against a local symbol, then we need to copy the reloc |
| 2513 | into the shared library. However, if we are linking with |
| 2514 | -Bsymbolic, we do not need to copy a reloc against a |
| 2515 | global symbol which is defined in an object we are |
| 2516 | including in the link (i.e., DEF_REGULAR is set). At |
| 2517 | this point we have not seen all the input files, so it is |
| 2518 | possible that DEF_REGULAR is not set now but will be set |
| 2519 | later (it is never cleared). We account for that |
| 2520 | possibility below by storing information in the |
| 2521 | pcrel_relocs_copied field of the hash table entry. */ |
| 2522 | if (info->shared |
| 2523 | && (ELF32_R_TYPE (rel->r_info) != R_ARM_PC24 |
| 2524 | || (h != NULL |
| 2525 | && (! info->symbolic |
| 2526 | || (h->elf_link_hash_flags |
| 2527 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 2528 | { |
| 2529 | /* When creating a shared object, we must copy these |
| 2530 | reloc types into the output file. We create a reloc |
| 2531 | section in dynobj and make room for this reloc. */ |
| 2532 | if (sreloc == NULL) |
| 2533 | { |
| 2534 | const char * name; |
| 2535 | |
| 2536 | name = (bfd_elf_string_from_elf_section |
| 2537 | (abfd, |
| 2538 | elf_elfheader (abfd)->e_shstrndx, |
| 2539 | elf_section_data (sec)->rel_hdr.sh_name)); |
| 2540 | if (name == NULL) |
| 2541 | return false; |
| 2542 | |
| 2543 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 |
| 2544 | && strcmp (bfd_get_section_name (abfd, sec), |
| 2545 | name + 4) == 0); |
| 2546 | |
| 2547 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 2548 | if (sreloc == NULL) |
| 2549 | { |
| 2550 | flagword flags; |
| 2551 | |
| 2552 | sreloc = bfd_make_section (dynobj, name); |
| 2553 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 2554 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 2555 | if ((sec->flags & SEC_ALLOC) != 0) |
| 2556 | flags |= SEC_ALLOC | SEC_LOAD; |
| 2557 | if (sreloc == NULL |
| 2558 | || ! bfd_set_section_flags (dynobj, sreloc, flags) |
| 2559 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
| 2560 | return false; |
| 2561 | } |
| 2562 | } |
| 2563 | |
| 2564 | sreloc->_raw_size += sizeof (Elf32_External_Rel); |
| 2565 | /* If we are linking with -Bsymbolic, and this is a |
| 2566 | global symbol, we count the number of PC relative |
| 2567 | relocations we have entered for this symbol, so that |
| 2568 | we can discard them again if the symbol is later |
| 2569 | defined by a regular object. Note that this function |
| 2570 | is only called if we are using an elf_i386 linker |
| 2571 | hash table, which means that h is really a pointer to |
| 2572 | an elf_i386_link_hash_entry. */ |
| 2573 | if (h != NULL && info->symbolic |
| 2574 | && ELF32_R_TYPE (rel->r_info) == R_ARM_PC24) |
| 2575 | { |
| 2576 | struct elf32_arm_link_hash_entry * eh; |
| 2577 | struct elf32_arm_pcrel_relocs_copied * p; |
| 2578 | |
| 2579 | eh = (struct elf32_arm_link_hash_entry *) h; |
| 2580 | |
| 2581 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) |
| 2582 | if (p->section == sreloc) |
| 2583 | break; |
| 2584 | |
| 2585 | if (p == NULL) |
| 2586 | { |
| 2587 | p = ((struct elf32_arm_pcrel_relocs_copied *) |
| 2588 | bfd_alloc (dynobj, sizeof * p)); |
| 2589 | |
| 2590 | if (p == NULL) |
| 2591 | return false; |
| 2592 | p->next = eh->pcrel_relocs_copied; |
| 2593 | eh->pcrel_relocs_copied = p; |
| 2594 | p->section = sreloc; |
| 2595 | p->count = 0; |
| 2596 | } |
| 2597 | |
| 2598 | ++p->count; |
| 2599 | } |
| 2600 | } |
| 2601 | break; |
| 2602 | |
| 2603 | /* This relocation describes the C++ object vtable hierarchy. |
| 2604 | Reconstruct it for later use during GC. */ |
| 2605 | case R_ARM_GNU_VTINHERIT: |
| 2606 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 2607 | return false; |
| 2608 | break; |
| 2609 | |
| 2610 | /* This relocation describes which C++ vtable entries are actually |
| 2611 | used. Record for later use during GC. */ |
| 2612 | case R_ARM_GNU_VTENTRY: |
| 2613 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
| 2614 | return false; |
| 2615 | break; |
| 2616 | } |
| 2617 | } |
| 2618 | |
| 2619 | return true; |
| 2620 | } |
| 2621 | |
| 2622 | /* Find the nearest line to a particular section and offset, for error |
| 2623 | reporting. This code is a duplicate of the code in elf.c, except |
| 2624 | that it also accepts STT_ARM_TFUNC as a symbol that names a function. */ |
| 2625 | |
| 2626 | static boolean |
| 2627 | elf32_arm_find_nearest_line |
| 2628 | (abfd, section, symbols, offset, filename_ptr, functionname_ptr, line_ptr) |
| 2629 | bfd * abfd; |
| 2630 | asection * section; |
| 2631 | asymbol ** symbols; |
| 2632 | bfd_vma offset; |
| 2633 | CONST char ** filename_ptr; |
| 2634 | CONST char ** functionname_ptr; |
| 2635 | unsigned int * line_ptr; |
| 2636 | { |
| 2637 | boolean found; |
| 2638 | const char * filename; |
| 2639 | asymbol * func; |
| 2640 | bfd_vma low_func; |
| 2641 | asymbol ** p; |
| 2642 | |
| 2643 | if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset, |
| 2644 | filename_ptr, functionname_ptr, |
| 2645 | line_ptr, 0, NULL)) |
| 2646 | return true; |
| 2647 | |
| 2648 | if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, |
| 2649 | &found, filename_ptr, |
| 2650 | functionname_ptr, line_ptr, |
| 2651 | &elf_tdata (abfd)->line_info)) |
| 2652 | return false; |
| 2653 | |
| 2654 | if (found) |
| 2655 | return true; |
| 2656 | |
| 2657 | if (symbols == NULL) |
| 2658 | return false; |
| 2659 | |
| 2660 | filename = NULL; |
| 2661 | func = NULL; |
| 2662 | low_func = 0; |
| 2663 | |
| 2664 | for (p = symbols; *p != NULL; p++) |
| 2665 | { |
| 2666 | elf_symbol_type *q; |
| 2667 | |
| 2668 | q = (elf_symbol_type *) *p; |
| 2669 | |
| 2670 | if (bfd_get_section (&q->symbol) != section) |
| 2671 | continue; |
| 2672 | |
| 2673 | switch (ELF_ST_TYPE (q->internal_elf_sym.st_info)) |
| 2674 | { |
| 2675 | default: |
| 2676 | break; |
| 2677 | case STT_FILE: |
| 2678 | filename = bfd_asymbol_name (&q->symbol); |
| 2679 | break; |
| 2680 | case STT_NOTYPE: |
| 2681 | case STT_FUNC: |
| 2682 | case STT_ARM_TFUNC: |
| 2683 | if (q->symbol.section == section |
| 2684 | && q->symbol.value >= low_func |
| 2685 | && q->symbol.value <= offset) |
| 2686 | { |
| 2687 | func = (asymbol *) q; |
| 2688 | low_func = q->symbol.value; |
| 2689 | } |
| 2690 | break; |
| 2691 | } |
| 2692 | } |
| 2693 | |
| 2694 | if (func == NULL) |
| 2695 | return false; |
| 2696 | |
| 2697 | *filename_ptr = filename; |
| 2698 | *functionname_ptr = bfd_asymbol_name (func); |
| 2699 | *line_ptr = 0; |
| 2700 | |
| 2701 | return true; |
| 2702 | } |
| 2703 | |
| 2704 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 2705 | regular object. The current definition is in some section of the |
| 2706 | dynamic object, but we're not including those sections. We have to |
| 2707 | change the definition to something the rest of the link can |
| 2708 | understand. */ |
| 2709 | |
| 2710 | static boolean |
| 2711 | elf32_arm_adjust_dynamic_symbol (info, h) |
| 2712 | struct bfd_link_info * info; |
| 2713 | struct elf_link_hash_entry * h; |
| 2714 | { |
| 2715 | bfd * dynobj; |
| 2716 | asection * s; |
| 2717 | unsigned int power_of_two; |
| 2718 | |
| 2719 | dynobj = elf_hash_table (info)->dynobj; |
| 2720 | |
| 2721 | /* Make sure we know what is going on here. */ |
| 2722 | BFD_ASSERT (dynobj != NULL |
| 2723 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) |
| 2724 | || h->weakdef != NULL |
| 2725 | || ((h->elf_link_hash_flags |
| 2726 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 2727 | && (h->elf_link_hash_flags |
| 2728 | & ELF_LINK_HASH_REF_REGULAR) != 0 |
| 2729 | && (h->elf_link_hash_flags |
| 2730 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); |
| 2731 | |
| 2732 | /* If this is a function, put it in the procedure linkage table. We |
| 2733 | will fill in the contents of the procedure linkage table later, |
| 2734 | when we know the address of the .got section. */ |
| 2735 | if (h->type == STT_FUNC |
| 2736 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) |
| 2737 | { |
| 2738 | if (! info->shared |
| 2739 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 |
| 2740 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) |
| 2741 | { |
| 2742 | /* This case can occur if we saw a PLT32 reloc in an input |
| 2743 | file, but the symbol was never referred to by a dynamic |
| 2744 | object. In such a case, we don't actually need to build |
| 2745 | a procedure linkage table, and we can just do a PC32 |
| 2746 | reloc instead. */ |
| 2747 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); |
| 2748 | return true; |
| 2749 | } |
| 2750 | |
| 2751 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 2752 | if (h->dynindx == -1) |
| 2753 | { |
| 2754 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 2755 | return false; |
| 2756 | } |
| 2757 | |
| 2758 | s = bfd_get_section_by_name (dynobj, ".plt"); |
| 2759 | BFD_ASSERT (s != NULL); |
| 2760 | |
| 2761 | /* If this is the first .plt entry, make room for the special |
| 2762 | first entry. */ |
| 2763 | if (s->_raw_size == 0) |
| 2764 | s->_raw_size += PLT_ENTRY_SIZE; |
| 2765 | |
| 2766 | /* If this symbol is not defined in a regular file, and we are |
| 2767 | not generating a shared library, then set the symbol to this |
| 2768 | location in the .plt. This is required to make function |
| 2769 | pointers compare as equal between the normal executable and |
| 2770 | the shared library. */ |
| 2771 | if (! info->shared |
| 2772 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 2773 | { |
| 2774 | h->root.u.def.section = s; |
| 2775 | h->root.u.def.value = s->_raw_size; |
| 2776 | } |
| 2777 | |
| 2778 | h->plt.offset = s->_raw_size; |
| 2779 | |
| 2780 | /* Make room for this entry. */ |
| 2781 | s->_raw_size += PLT_ENTRY_SIZE; |
| 2782 | |
| 2783 | /* We also need to make an entry in the .got.plt section, which |
| 2784 | will be placed in the .got section by the linker script. */ |
| 2785 | s = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 2786 | BFD_ASSERT (s != NULL); |
| 2787 | s->_raw_size += 4; |
| 2788 | |
| 2789 | /* We also need to make an entry in the .rel.plt section. */ |
| 2790 | |
| 2791 | s = bfd_get_section_by_name (dynobj, ".rel.plt"); |
| 2792 | BFD_ASSERT (s != NULL); |
| 2793 | s->_raw_size += sizeof (Elf32_External_Rel); |
| 2794 | |
| 2795 | return true; |
| 2796 | } |
| 2797 | |
| 2798 | /* If this is a weak symbol, and there is a real definition, the |
| 2799 | processor independent code will have arranged for us to see the |
| 2800 | real definition first, and we can just use the same value. */ |
| 2801 | if (h->weakdef != NULL) |
| 2802 | { |
| 2803 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| 2804 | || h->weakdef->root.type == bfd_link_hash_defweak); |
| 2805 | h->root.u.def.section = h->weakdef->root.u.def.section; |
| 2806 | h->root.u.def.value = h->weakdef->root.u.def.value; |
| 2807 | return true; |
| 2808 | } |
| 2809 | |
| 2810 | /* This is a reference to a symbol defined by a dynamic object which |
| 2811 | is not a function. */ |
| 2812 | |
| 2813 | /* If we are creating a shared library, we must presume that the |
| 2814 | only references to the symbol are via the global offset table. |
| 2815 | For such cases we need not do anything here; the relocations will |
| 2816 | be handled correctly by relocate_section. */ |
| 2817 | if (info->shared) |
| 2818 | return true; |
| 2819 | |
| 2820 | /* We must allocate the symbol in our .dynbss section, which will |
| 2821 | become part of the .bss section of the executable. There will be |
| 2822 | an entry for this symbol in the .dynsym section. The dynamic |
| 2823 | object will contain position independent code, so all references |
| 2824 | from the dynamic object to this symbol will go through the global |
| 2825 | offset table. The dynamic linker will use the .dynsym entry to |
| 2826 | determine the address it must put in the global offset table, so |
| 2827 | both the dynamic object and the regular object will refer to the |
| 2828 | same memory location for the variable. */ |
| 2829 | s = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 2830 | BFD_ASSERT (s != NULL); |
| 2831 | |
| 2832 | /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to |
| 2833 | copy the initial value out of the dynamic object and into the |
| 2834 | runtime process image. We need to remember the offset into the |
| 2835 | .rel.bss section we are going to use. */ |
| 2836 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 2837 | { |
| 2838 | asection *srel; |
| 2839 | |
| 2840 | srel = bfd_get_section_by_name (dynobj, ".rel.bss"); |
| 2841 | BFD_ASSERT (srel != NULL); |
| 2842 | srel->_raw_size += sizeof (Elf32_External_Rel); |
| 2843 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
| 2844 | } |
| 2845 | |
| 2846 | /* We need to figure out the alignment required for this symbol. I |
| 2847 | have no idea how ELF linkers handle this. */ |
| 2848 | power_of_two = bfd_log2 (h->size); |
| 2849 | if (power_of_two > 3) |
| 2850 | power_of_two = 3; |
| 2851 | |
| 2852 | /* Apply the required alignment. */ |
| 2853 | s->_raw_size = BFD_ALIGN (s->_raw_size, |
| 2854 | (bfd_size_type) (1 << power_of_two)); |
| 2855 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) |
| 2856 | { |
| 2857 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) |
| 2858 | return false; |
| 2859 | } |
| 2860 | |
| 2861 | /* Define the symbol as being at this point in the section. */ |
| 2862 | h->root.u.def.section = s; |
| 2863 | h->root.u.def.value = s->_raw_size; |
| 2864 | |
| 2865 | /* Increment the section size to make room for the symbol. */ |
| 2866 | s->_raw_size += h->size; |
| 2867 | |
| 2868 | return true; |
| 2869 | } |
| 2870 | |
| 2871 | /* Set the sizes of the dynamic sections. */ |
| 2872 | |
| 2873 | static boolean |
| 2874 | elf32_arm_size_dynamic_sections (output_bfd, info) |
| 2875 | bfd * output_bfd; |
| 2876 | struct bfd_link_info * info; |
| 2877 | { |
| 2878 | bfd * dynobj; |
| 2879 | asection * s; |
| 2880 | boolean plt; |
| 2881 | boolean relocs; |
| 2882 | boolean reltext; |
| 2883 | |
| 2884 | dynobj = elf_hash_table (info)->dynobj; |
| 2885 | BFD_ASSERT (dynobj != NULL); |
| 2886 | |
| 2887 | if (elf_hash_table (info)->dynamic_sections_created) |
| 2888 | { |
| 2889 | /* Set the contents of the .interp section to the interpreter. */ |
| 2890 | if (! info->shared) |
| 2891 | { |
| 2892 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 2893 | BFD_ASSERT (s != NULL); |
| 2894 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 2895 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 2896 | } |
| 2897 | } |
| 2898 | else |
| 2899 | { |
| 2900 | /* We may have created entries in the .rel.got section. |
| 2901 | However, if we are not creating the dynamic sections, we will |
| 2902 | not actually use these entries. Reset the size of .rel.got, |
| 2903 | which will cause it to get stripped from the output file |
| 2904 | below. */ |
| 2905 | s = bfd_get_section_by_name (dynobj, ".rel.got"); |
| 2906 | if (s != NULL) |
| 2907 | s->_raw_size = 0; |
| 2908 | } |
| 2909 | |
| 2910 | /* If this is a -Bsymbolic shared link, then we need to discard all |
| 2911 | PC relative relocs against symbols defined in a regular object. |
| 2912 | We allocated space for them in the check_relocs routine, but we |
| 2913 | will not fill them in in the relocate_section routine. */ |
| 2914 | if (info->shared && info->symbolic) |
| 2915 | elf32_arm_link_hash_traverse (elf32_arm_hash_table (info), |
| 2916 | elf32_arm_discard_copies, |
| 2917 | (PTR) NULL); |
| 2918 | |
| 2919 | /* The check_relocs and adjust_dynamic_symbol entry points have |
| 2920 | determined the sizes of the various dynamic sections. Allocate |
| 2921 | memory for them. */ |
| 2922 | plt = false; |
| 2923 | relocs = false; |
| 2924 | reltext = false; |
| 2925 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 2926 | { |
| 2927 | const char * name; |
| 2928 | boolean strip; |
| 2929 | |
| 2930 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 2931 | continue; |
| 2932 | |
| 2933 | /* It's OK to base decisions on the section name, because none |
| 2934 | of the dynobj section names depend upon the input files. */ |
| 2935 | name = bfd_get_section_name (dynobj, s); |
| 2936 | |
| 2937 | strip = false; |
| 2938 | |
| 2939 | if (strcmp (name, ".plt") == 0) |
| 2940 | { |
| 2941 | if (s->_raw_size == 0) |
| 2942 | { |
| 2943 | /* Strip this section if we don't need it; see the |
| 2944 | comment below. */ |
| 2945 | strip = true; |
| 2946 | } |
| 2947 | else |
| 2948 | { |
| 2949 | /* Remember whether there is a PLT. */ |
| 2950 | plt = true; |
| 2951 | } |
| 2952 | } |
| 2953 | else if (strncmp (name, ".rel", 4) == 0) |
| 2954 | { |
| 2955 | if (s->_raw_size == 0) |
| 2956 | { |
| 2957 | /* If we don't need this section, strip it from the |
| 2958 | output file. This is mostly to handle .rel.bss and |
| 2959 | .rel.plt. We must create both sections in |
| 2960 | create_dynamic_sections, because they must be created |
| 2961 | before the linker maps input sections to output |
| 2962 | sections. The linker does that before |
| 2963 | adjust_dynamic_symbol is called, and it is that |
| 2964 | function which decides whether anything needs to go |
| 2965 | into these sections. */ |
| 2966 | strip = true; |
| 2967 | } |
| 2968 | else |
| 2969 | { |
| 2970 | asection * target; |
| 2971 | |
| 2972 | /* Remember whether there are any reloc sections other |
| 2973 | than .rel.plt. */ |
| 2974 | if (strcmp (name, ".rel.plt") != 0) |
| 2975 | { |
| 2976 | const char *outname; |
| 2977 | |
| 2978 | relocs = true; |
| 2979 | |
| 2980 | /* If this relocation section applies to a read only |
| 2981 | section, then we probably need a DT_TEXTREL |
| 2982 | entry. The entries in the .rel.plt section |
| 2983 | really apply to the .got section, which we |
| 2984 | created ourselves and so know is not readonly. */ |
| 2985 | outname = bfd_get_section_name (output_bfd, |
| 2986 | s->output_section); |
| 2987 | target = bfd_get_section_by_name (output_bfd, outname + 4); |
| 2988 | |
| 2989 | if (target != NULL |
| 2990 | && (target->flags & SEC_READONLY) != 0 |
| 2991 | && (target->flags & SEC_ALLOC) != 0) |
| 2992 | reltext = true; |
| 2993 | } |
| 2994 | |
| 2995 | /* We use the reloc_count field as a counter if we need |
| 2996 | to copy relocs into the output file. */ |
| 2997 | s->reloc_count = 0; |
| 2998 | } |
| 2999 | } |
| 3000 | else if (strncmp (name, ".got", 4) != 0) |
| 3001 | { |
| 3002 | /* It's not one of our sections, so don't allocate space. */ |
| 3003 | continue; |
| 3004 | } |
| 3005 | |
| 3006 | if (strip) |
| 3007 | { |
| 3008 | asection ** spp; |
| 3009 | |
| 3010 | for (spp = &s->output_section->owner->sections; |
| 3011 | *spp != s->output_section; |
| 3012 | spp = &(*spp)->next) |
| 3013 | ; |
| 3014 | *spp = s->output_section->next; |
| 3015 | --s->output_section->owner->section_count; |
| 3016 | |
| 3017 | continue; |
| 3018 | } |
| 3019 | |
| 3020 | /* Allocate memory for the section contents. */ |
| 3021 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); |
| 3022 | if (s->contents == NULL && s->_raw_size != 0) |
| 3023 | return false; |
| 3024 | } |
| 3025 | |
| 3026 | if (elf_hash_table (info)->dynamic_sections_created) |
| 3027 | { |
| 3028 | /* Add some entries to the .dynamic section. We fill in the |
| 3029 | values later, in elf32_arm_finish_dynamic_sections, but we |
| 3030 | must add the entries now so that we get the correct size for |
| 3031 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 3032 | dynamic linker and used by the debugger. */ |
| 3033 | if (! info->shared) |
| 3034 | { |
| 3035 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) |
| 3036 | return false; |
| 3037 | } |
| 3038 | |
| 3039 | if (plt) |
| 3040 | { |
| 3041 | if ( ! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) |
| 3042 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) |
| 3043 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) |
| 3044 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) |
| 3045 | return false; |
| 3046 | } |
| 3047 | |
| 3048 | if (relocs) |
| 3049 | { |
| 3050 | if ( ! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) |
| 3051 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) |
| 3052 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, |
| 3053 | sizeof (Elf32_External_Rel))) |
| 3054 | return false; |
| 3055 | } |
| 3056 | |
| 3057 | if (reltext) |
| 3058 | { |
| 3059 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) |
| 3060 | return false; |
| 3061 | info->flags |= DF_TEXTREL; |
| 3062 | } |
| 3063 | } |
| 3064 | |
| 3065 | return true; |
| 3066 | } |
| 3067 | |
| 3068 | /* This function is called via elf32_arm_link_hash_traverse if we are |
| 3069 | creating a shared object with -Bsymbolic. It discards the space |
| 3070 | allocated to copy PC relative relocs against symbols which are |
| 3071 | defined in regular objects. We allocated space for them in the |
| 3072 | check_relocs routine, but we won't fill them in in the |
| 3073 | relocate_section routine. */ |
| 3074 | |
| 3075 | static boolean |
| 3076 | elf32_arm_discard_copies (h, ignore) |
| 3077 | struct elf32_arm_link_hash_entry * h; |
| 3078 | PTR ignore ATTRIBUTE_UNUSED; |
| 3079 | { |
| 3080 | struct elf32_arm_pcrel_relocs_copied * s; |
| 3081 | |
| 3082 | /* We only discard relocs for symbols defined in a regular object. */ |
| 3083 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 3084 | return true; |
| 3085 | |
| 3086 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) |
| 3087 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); |
| 3088 | |
| 3089 | return true; |
| 3090 | } |
| 3091 | |
| 3092 | /* Finish up dynamic symbol handling. We set the contents of various |
| 3093 | dynamic sections here. */ |
| 3094 | |
| 3095 | static boolean |
| 3096 | elf32_arm_finish_dynamic_symbol (output_bfd, info, h, sym) |
| 3097 | bfd * output_bfd; |
| 3098 | struct bfd_link_info * info; |
| 3099 | struct elf_link_hash_entry * h; |
| 3100 | Elf_Internal_Sym * sym; |
| 3101 | { |
| 3102 | bfd * dynobj; |
| 3103 | |
| 3104 | dynobj = elf_hash_table (info)->dynobj; |
| 3105 | |
| 3106 | if (h->plt.offset != (bfd_vma) -1) |
| 3107 | { |
| 3108 | asection * splt; |
| 3109 | asection * sgot; |
| 3110 | asection * srel; |
| 3111 | bfd_vma plt_index; |
| 3112 | bfd_vma got_offset; |
| 3113 | Elf_Internal_Rel rel; |
| 3114 | |
| 3115 | /* This symbol has an entry in the procedure linkage table. Set |
| 3116 | it up. */ |
| 3117 | |
| 3118 | BFD_ASSERT (h->dynindx != -1); |
| 3119 | |
| 3120 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 3121 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 3122 | srel = bfd_get_section_by_name (dynobj, ".rel.plt"); |
| 3123 | BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); |
| 3124 | |
| 3125 | /* Get the index in the procedure linkage table which |
| 3126 | corresponds to this symbol. This is the index of this symbol |
| 3127 | in all the symbols for which we are making plt entries. The |
| 3128 | first entry in the procedure linkage table is reserved. */ |
| 3129 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 3130 | |
| 3131 | /* Get the offset into the .got table of the entry that |
| 3132 | corresponds to this function. Each .got entry is 4 bytes. |
| 3133 | The first three are reserved. */ |
| 3134 | got_offset = (plt_index + 3) * 4; |
| 3135 | |
| 3136 | /* Fill in the entry in the procedure linkage table. */ |
| 3137 | memcpy (splt->contents + h->plt.offset, |
| 3138 | elf32_arm_plt_entry, |
| 3139 | PLT_ENTRY_SIZE); |
| 3140 | bfd_put_32 (output_bfd, |
| 3141 | (sgot->output_section->vma |
| 3142 | + sgot->output_offset |
| 3143 | + got_offset |
| 3144 | - splt->output_section->vma |
| 3145 | - splt->output_offset |
| 3146 | - h->plt.offset - 12), |
| 3147 | splt->contents + h->plt.offset + 12); |
| 3148 | |
| 3149 | /* Fill in the entry in the global offset table. */ |
| 3150 | bfd_put_32 (output_bfd, |
| 3151 | (splt->output_section->vma |
| 3152 | + splt->output_offset), |
| 3153 | sgot->contents + got_offset); |
| 3154 | |
| 3155 | /* Fill in the entry in the .rel.plt section. */ |
| 3156 | rel.r_offset = (sgot->output_section->vma |
| 3157 | + sgot->output_offset |
| 3158 | + got_offset); |
| 3159 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT); |
| 3160 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 3161 | ((Elf32_External_Rel *) srel->contents |
| 3162 | + plt_index)); |
| 3163 | |
| 3164 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 3165 | { |
| 3166 | /* Mark the symbol as undefined, rather than as defined in |
| 3167 | the .plt section. Leave the value alone. */ |
| 3168 | sym->st_shndx = SHN_UNDEF; |
| 3169 | } |
| 3170 | } |
| 3171 | |
| 3172 | if (h->got.offset != (bfd_vma) -1) |
| 3173 | { |
| 3174 | asection * sgot; |
| 3175 | asection * srel; |
| 3176 | Elf_Internal_Rel rel; |
| 3177 | |
| 3178 | /* This symbol has an entry in the global offset table. Set it |
| 3179 | up. */ |
| 3180 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 3181 | srel = bfd_get_section_by_name (dynobj, ".rel.got"); |
| 3182 | BFD_ASSERT (sgot != NULL && srel != NULL); |
| 3183 | |
| 3184 | rel.r_offset = (sgot->output_section->vma |
| 3185 | + sgot->output_offset |
| 3186 | + (h->got.offset &~ 1)); |
| 3187 | |
| 3188 | /* If this is a -Bsymbolic link, and the symbol is defined |
| 3189 | locally, we just want to emit a RELATIVE reloc. The entry in |
| 3190 | the global offset table will already have been initialized in |
| 3191 | the relocate_section function. */ |
| 3192 | if (info->shared |
| 3193 | && (info->symbolic || h->dynindx == -1) |
| 3194 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) |
| 3195 | rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); |
| 3196 | else |
| 3197 | { |
| 3198 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); |
| 3199 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); |
| 3200 | } |
| 3201 | |
| 3202 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 3203 | ((Elf32_External_Rel *) srel->contents |
| 3204 | + srel->reloc_count)); |
| 3205 | ++srel->reloc_count; |
| 3206 | } |
| 3207 | |
| 3208 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| 3209 | { |
| 3210 | asection * s; |
| 3211 | Elf_Internal_Rel rel; |
| 3212 | |
| 3213 | /* This symbol needs a copy reloc. Set it up. */ |
| 3214 | BFD_ASSERT (h->dynindx != -1 |
| 3215 | && (h->root.type == bfd_link_hash_defined |
| 3216 | || h->root.type == bfd_link_hash_defweak)); |
| 3217 | |
| 3218 | s = bfd_get_section_by_name (h->root.u.def.section->owner, |
| 3219 | ".rel.bss"); |
| 3220 | BFD_ASSERT (s != NULL); |
| 3221 | |
| 3222 | rel.r_offset = (h->root.u.def.value |
| 3223 | + h->root.u.def.section->output_section->vma |
| 3224 | + h->root.u.def.section->output_offset); |
| 3225 | rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY); |
| 3226 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 3227 | ((Elf32_External_Rel *) s->contents |
| 3228 | + s->reloc_count)); |
| 3229 | ++s->reloc_count; |
| 3230 | } |
| 3231 | |
| 3232 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| 3233 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 3234 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 3235 | sym->st_shndx = SHN_ABS; |
| 3236 | |
| 3237 | return true; |
| 3238 | } |
| 3239 | |
| 3240 | /* Finish up the dynamic sections. */ |
| 3241 | |
| 3242 | static boolean |
| 3243 | elf32_arm_finish_dynamic_sections (output_bfd, info) |
| 3244 | bfd * output_bfd; |
| 3245 | struct bfd_link_info * info; |
| 3246 | { |
| 3247 | bfd * dynobj; |
| 3248 | asection * sgot; |
| 3249 | asection * sdyn; |
| 3250 | |
| 3251 | dynobj = elf_hash_table (info)->dynobj; |
| 3252 | |
| 3253 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 3254 | BFD_ASSERT (sgot != NULL); |
| 3255 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 3256 | |
| 3257 | if (elf_hash_table (info)->dynamic_sections_created) |
| 3258 | { |
| 3259 | asection *splt; |
| 3260 | Elf32_External_Dyn *dyncon, *dynconend; |
| 3261 | |
| 3262 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 3263 | BFD_ASSERT (splt != NULL && sdyn != NULL); |
| 3264 | |
| 3265 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 3266 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); |
| 3267 | |
| 3268 | for (; dyncon < dynconend; dyncon++) |
| 3269 | { |
| 3270 | Elf_Internal_Dyn dyn; |
| 3271 | const char * name; |
| 3272 | asection * s; |
| 3273 | |
| 3274 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 3275 | |
| 3276 | switch (dyn.d_tag) |
| 3277 | { |
| 3278 | default: |
| 3279 | break; |
| 3280 | |
| 3281 | case DT_PLTGOT: |
| 3282 | name = ".got"; |
| 3283 | goto get_vma; |
| 3284 | case DT_JMPREL: |
| 3285 | name = ".rel.plt"; |
| 3286 | get_vma: |
| 3287 | s = bfd_get_section_by_name (output_bfd, name); |
| 3288 | BFD_ASSERT (s != NULL); |
| 3289 | dyn.d_un.d_ptr = s->vma; |
| 3290 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 3291 | break; |
| 3292 | |
| 3293 | case DT_PLTRELSZ: |
| 3294 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); |
| 3295 | BFD_ASSERT (s != NULL); |
| 3296 | if (s->_cooked_size != 0) |
| 3297 | dyn.d_un.d_val = s->_cooked_size; |
| 3298 | else |
| 3299 | dyn.d_un.d_val = s->_raw_size; |
| 3300 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 3301 | break; |
| 3302 | |
| 3303 | case DT_RELSZ: |
| 3304 | /* My reading of the SVR4 ABI indicates that the |
| 3305 | procedure linkage table relocs (DT_JMPREL) should be |
| 3306 | included in the overall relocs (DT_REL). This is |
| 3307 | what Solaris does. However, UnixWare can not handle |
| 3308 | that case. Therefore, we override the DT_RELSZ entry |
| 3309 | here to make it not include the JMPREL relocs. Since |
| 3310 | the linker script arranges for .rel.plt to follow all |
| 3311 | other relocation sections, we don't have to worry |
| 3312 | about changing the DT_REL entry. */ |
| 3313 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); |
| 3314 | if (s != NULL) |
| 3315 | { |
| 3316 | if (s->_cooked_size != 0) |
| 3317 | dyn.d_un.d_val -= s->_cooked_size; |
| 3318 | else |
| 3319 | dyn.d_un.d_val -= s->_raw_size; |
| 3320 | } |
| 3321 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 3322 | break; |
| 3323 | } |
| 3324 | } |
| 3325 | |
| 3326 | /* Fill in the first entry in the procedure linkage table. */ |
| 3327 | if (splt->_raw_size > 0) |
| 3328 | memcpy (splt->contents, elf32_arm_plt0_entry, PLT_ENTRY_SIZE); |
| 3329 | |
| 3330 | /* UnixWare sets the entsize of .plt to 4, although that doesn't |
| 3331 | really seem like the right value. */ |
| 3332 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; |
| 3333 | } |
| 3334 | |
| 3335 | /* Fill in the first three entries in the global offset table. */ |
| 3336 | if (sgot->_raw_size > 0) |
| 3337 | { |
| 3338 | if (sdyn == NULL) |
| 3339 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); |
| 3340 | else |
| 3341 | bfd_put_32 (output_bfd, |
| 3342 | sdyn->output_section->vma + sdyn->output_offset, |
| 3343 | sgot->contents); |
| 3344 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); |
| 3345 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); |
| 3346 | } |
| 3347 | |
| 3348 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; |
| 3349 | |
| 3350 | return true; |
| 3351 | } |
| 3352 | |
| 3353 | static void |
| 3354 | elf32_arm_post_process_headers (abfd, link_info) |
| 3355 | bfd * abfd; |
| 3356 | struct bfd_link_info * link_info ATTRIBUTE_UNUSED; |
| 3357 | { |
| 3358 | Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */ |
| 3359 | |
| 3360 | i_ehdrp = elf_elfheader (abfd); |
| 3361 | |
| 3362 | i_ehdrp->e_ident[EI_OSABI] = ARM_ELF_OS_ABI_VERSION; |
| 3363 | i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION; |
| 3364 | } |
| 3365 | |
| 3366 | #define ELF_ARCH bfd_arch_arm |
| 3367 | #define ELF_MACHINE_CODE EM_ARM |
| 3368 | #define ELF_MAXPAGESIZE 0x8000 |
| 3369 | |
| 3370 | #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data |
| 3371 | #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data |
| 3372 | #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags |
| 3373 | #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data |
| 3374 | #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create |
| 3375 | #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup |
| 3376 | #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line |
| 3377 | |
| 3378 | #define elf_backend_get_symbol_type elf32_arm_get_symbol_type |
| 3379 | #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook |
| 3380 | #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook |
| 3381 | #define elf_backend_check_relocs elf32_arm_check_relocs |
| 3382 | #define elf_backend_relocate_section elf32_arm_relocate_section |
| 3383 | #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol |
| 3384 | #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections |
| 3385 | #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol |
| 3386 | #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections |
| 3387 | #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections |
| 3388 | #define elf_backend_post_process_headers elf32_arm_post_process_headers |
| 3389 | |
| 3390 | #define elf_backend_can_gc_sections 1 |
| 3391 | #define elf_backend_plt_readonly 1 |
| 3392 | #define elf_backend_want_got_plt 1 |
| 3393 | #define elf_backend_want_plt_sym 0 |
| 3394 | |
| 3395 | #define elf_backend_got_header_size 12 |
| 3396 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE |
| 3397 | |
| 3398 | #include "elf32-target.h" |