1 /* Lattice Mico32-specific support for 32-bit ELF 2 Copyright 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. 3 Contributed by Jon Beniston <jon@beniston.com> 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #include "sysdep.h" 23 #include "bfd.h" 24 #include "libbfd.h" 25 #include "elf-bfd.h" 26 #include "elf/lm32.h" 27 28 #define DEFAULT_STACK_SIZE 0x20000 29 30 #define PLT_ENTRY_SIZE 20 31 32 #define PLT0_ENTRY_WORD0 0 33 #define PLT0_ENTRY_WORD1 0 34 #define PLT0_ENTRY_WORD2 0 35 #define PLT0_ENTRY_WORD3 0 36 #define PLT0_ENTRY_WORD4 0 37 38 #define PLT0_PIC_ENTRY_WORD0 0 39 #define PLT0_PIC_ENTRY_WORD1 0 40 #define PLT0_PIC_ENTRY_WORD2 0 41 #define PLT0_PIC_ENTRY_WORD3 0 42 #define PLT0_PIC_ENTRY_WORD4 0 43 44 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 45 46 extern const bfd_target bfd_elf32_lm32fdpic_vec; 47 48 #define IS_FDPIC(bfd) ((bfd)->xvec == &bfd_elf32_lm32fdpic_vec) 49 50 static bfd_reloc_status_type lm32_elf_gprel_reloc 51 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 52 53 /* The linker needs to keep track of the number of relocs that it 54 decides to copy as dynamic relocs in check_relocs for each symbol. 55 This is so that it can later discard them if they are found to be 56 unnecessary. We store the information in a field extending the 57 regular ELF linker hash table. */ 58 59 struct elf_lm32_dyn_relocs 60 { 61 struct elf_lm32_dyn_relocs *next; 62 63 /* The input section of the reloc. */ 64 asection *sec; 65 66 /* Total number of relocs copied for the input section. */ 67 bfd_size_type count; 68 69 /* Number of pc-relative relocs copied for the input section. */ 70 bfd_size_type pc_count; 71 }; 72 73 /* lm32 ELF linker hash entry. */ 74 75 struct elf_lm32_link_hash_entry 76 { 77 struct elf_link_hash_entry root; 78 79 /* Track dynamic relocs copied for this symbol. */ 80 struct elf_lm32_dyn_relocs *dyn_relocs; 81 }; 82 83 /* lm32 ELF linker hash table. */ 84 85 struct elf_lm32_link_hash_table 86 { 87 struct elf_link_hash_table root; 88 89 /* Short-cuts to get to dynamic linker sections. */ 90 asection *sgot; 91 asection *sgotplt; 92 asection *srelgot; 93 asection *sfixup32; 94 asection *splt; 95 asection *srelplt; 96 asection *sdynbss; 97 asection *srelbss; 98 99 int relocs32; 100 }; 101 102 /* Get the lm32 ELF linker hash table from a link_info structure. */ 103 104 #define lm32_elf_hash_table(p) \ 105 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 106 == LM32_ELF_DATA ? ((struct elf_lm32_link_hash_table *) ((p)->hash)) : NULL) 107 108 #define lm32fdpic_got_section(info) \ 109 (lm32_elf_hash_table (info)->sgot) 110 #define lm32fdpic_gotrel_section(info) \ 111 (lm32_elf_hash_table (info)->srelgot) 112 #define lm32fdpic_fixup32_section(info) \ 113 (lm32_elf_hash_table (info)->sfixup32) 114 115 struct weak_symbol_list 116 { 117 const char *name; 118 struct weak_symbol_list *next; 119 }; 120 121 /* Create an entry in an lm32 ELF linker hash table. */ 122 123 static struct bfd_hash_entry * 124 lm32_elf_link_hash_newfunc (struct bfd_hash_entry *entry, 125 struct bfd_hash_table *table, 126 const char *string) 127 { 128 struct elf_lm32_link_hash_entry *ret = 129 (struct elf_lm32_link_hash_entry *) entry; 130 131 /* Allocate the structure if it has not already been allocated by a 132 subclass. */ 133 if (ret == NULL) 134 ret = bfd_hash_allocate (table, 135 sizeof (struct elf_lm32_link_hash_entry)); 136 if (ret == NULL) 137 return NULL; 138 139 /* Call the allocation method of the superclass. */ 140 ret = ((struct elf_lm32_link_hash_entry *) 141 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 142 table, string)); 143 if (ret != NULL) 144 { 145 struct elf_lm32_link_hash_entry *eh; 146 147 eh = (struct elf_lm32_link_hash_entry *) ret; 148 eh->dyn_relocs = NULL; 149 } 150 151 return (struct bfd_hash_entry *) ret; 152 } 153 154 /* Create an lm32 ELF linker hash table. */ 155 156 static struct bfd_link_hash_table * 157 lm32_elf_link_hash_table_create (bfd *abfd) 158 { 159 struct elf_lm32_link_hash_table *ret; 160 bfd_size_type amt = sizeof (struct elf_lm32_link_hash_table); 161 162 ret = bfd_malloc (amt); 163 if (ret == NULL) 164 return NULL; 165 166 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 167 lm32_elf_link_hash_newfunc, 168 sizeof (struct elf_lm32_link_hash_entry), 169 LM32_ELF_DATA)) 170 { 171 free (ret); 172 return NULL; 173 } 174 175 ret->sgot = NULL; 176 ret->sgotplt = NULL; 177 ret->srelgot = NULL; 178 ret->sfixup32 = NULL; 179 ret->splt = NULL; 180 ret->srelplt = NULL; 181 ret->sdynbss = NULL; 182 ret->srelbss = NULL; 183 ret->relocs32 = 0; 184 185 return &ret->root.root; 186 } 187 188 /* Add a fixup to the ROFIXUP section. */ 189 190 static bfd_vma 191 _lm32fdpic_add_rofixup (bfd *output_bfd, asection *rofixup, bfd_vma relocation) 192 { 193 bfd_vma fixup_offset; 194 195 if (rofixup->flags & SEC_EXCLUDE) 196 return -1; 197 198 fixup_offset = rofixup->reloc_count * 4; 199 if (rofixup->contents) 200 { 201 BFD_ASSERT (fixup_offset < rofixup->size); 202 if (fixup_offset < rofixup->size) 203 bfd_put_32 (output_bfd, relocation, rofixup->contents + fixup_offset); 204 } 205 rofixup->reloc_count++; 206 207 return fixup_offset; 208 } 209 210 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up 211 shortcuts to them in our hash table. */ 212 213 static bfd_boolean 214 create_got_section (bfd *dynobj, struct bfd_link_info *info) 215 { 216 struct elf_lm32_link_hash_table *htab; 217 asection *s; 218 219 /* This function may be called more than once. */ 220 s = bfd_get_linker_section (dynobj, ".got"); 221 if (s != NULL) 222 return TRUE; 223 224 htab = lm32_elf_hash_table (info); 225 if (htab == NULL) 226 return FALSE; 227 228 if (! _bfd_elf_create_got_section (dynobj, info)) 229 return FALSE; 230 231 htab->sgot = bfd_get_linker_section (dynobj, ".got"); 232 htab->sgotplt = bfd_get_linker_section (dynobj, ".got.plt"); 233 htab->srelgot = bfd_get_linker_section (dynobj, ".rela.got"); 234 if (! htab->sgot || ! htab->sgotplt || ! htab->srelgot) 235 abort (); 236 237 return TRUE; 238 } 239 240 /* Create .rofixup sections in DYNOBJ, and set up 241 shortcuts to them in our hash table. */ 242 243 static bfd_boolean 244 create_rofixup_section (bfd *dynobj, struct bfd_link_info *info) 245 { 246 struct elf_lm32_link_hash_table *htab; 247 htab = lm32_elf_hash_table (info); 248 249 if (htab == NULL) 250 return FALSE; 251 252 /* Fixup section for R_LM32_32 relocs. */ 253 lm32fdpic_fixup32_section (info) 254 = bfd_make_section_anyway_with_flags (dynobj, 255 ".rofixup", 256 (SEC_ALLOC 257 | SEC_LOAD 258 | SEC_HAS_CONTENTS 259 | SEC_IN_MEMORY 260 | SEC_LINKER_CREATED 261 | SEC_READONLY)); 262 if (lm32fdpic_fixup32_section (info) == NULL 263 || ! bfd_set_section_alignment (dynobj, 264 lm32fdpic_fixup32_section (info), 2)) 265 return FALSE; 266 267 return TRUE; 268 } 269 270 static reloc_howto_type lm32_elf_howto_table [] = 271 { 272 /* This reloc does nothing. */ 273 HOWTO (R_LM32_NONE, /* type */ 274 0, /* rightshift */ 275 2, /* size (0 = byte, 1 = short, 2 = long) */ 276 32, /* bitsize */ 277 FALSE, /* pc_relative */ 278 0, /* bitpos */ 279 complain_overflow_bitfield,/* complain_on_overflow */ 280 bfd_elf_generic_reloc, /* special_function */ 281 "R_LM32_NONE", /* name */ 282 FALSE, /* partial_inplace */ 283 0, /* src_mask */ 284 0, /* dst_mask */ 285 FALSE), /* pcrel_offset */ 286 287 /* An 8 bit absolute relocation. */ 288 HOWTO (R_LM32_8, /* type */ 289 0, /* rightshift */ 290 0, /* size (0 = byte, 1 = short, 2 = long) */ 291 8, /* bitsize */ 292 FALSE, /* pc_relative */ 293 0, /* bitpos */ 294 complain_overflow_bitfield,/* complain_on_overflow */ 295 bfd_elf_generic_reloc, /* special_function */ 296 "R_LM32_8", /* name */ 297 FALSE, /* partial_inplace */ 298 0, /* src_mask */ 299 0xff, /* dst_mask */ 300 FALSE), /* pcrel_offset */ 301 302 /* A 16 bit absolute relocation. */ 303 HOWTO (R_LM32_16, /* type */ 304 0, /* rightshift */ 305 1, /* size (0 = byte, 1 = short, 2 = long) */ 306 16, /* bitsize */ 307 FALSE, /* pc_relative */ 308 0, /* bitpos */ 309 complain_overflow_bitfield,/* complain_on_overflow */ 310 bfd_elf_generic_reloc, /* special_function */ 311 "R_LM32_16", /* name */ 312 FALSE, /* partial_inplace */ 313 0, /* src_mask */ 314 0xffff, /* dst_mask */ 315 FALSE), /* pcrel_offset */ 316 317 /* A 32 bit absolute relocation. */ 318 HOWTO (R_LM32_32, /* type */ 319 0, /* rightshift */ 320 2, /* size (0 = byte, 1 = short, 2 = long) */ 321 32, /* bitsize */ 322 FALSE, /* pc_relative */ 323 0, /* bitpos */ 324 complain_overflow_bitfield,/* complain_on_overflow */ 325 bfd_elf_generic_reloc, /* special_function */ 326 "R_LM32_32", /* name */ 327 FALSE, /* partial_inplace */ 328 0, /* src_mask */ 329 0xffffffff, /* dst_mask */ 330 FALSE), /* pcrel_offset */ 331 332 HOWTO (R_LM32_HI16, /* type */ 333 16, /* rightshift */ 334 2, /* size (0 = byte, 1 = short, 2 = long) */ 335 16, /* bitsize */ 336 FALSE, /* pc_relative */ 337 0, /* bitpos */ 338 complain_overflow_bitfield,/* complain_on_overflow */ 339 bfd_elf_generic_reloc, /* special_function */ 340 "R_LM32_HI16", /* name */ 341 FALSE, /* partial_inplace */ 342 0, /* src_mask */ 343 0xffff, /* dst_mask */ 344 FALSE), /* pcrel_offset */ 345 346 HOWTO (R_LM32_LO16, /* type */ 347 0, /* rightshift */ 348 2, /* size (0 = byte, 1 = short, 2 = long) */ 349 16, /* bitsize */ 350 FALSE, /* pc_relative */ 351 0, /* bitpos */ 352 complain_overflow_dont, /* complain_on_overflow */ 353 bfd_elf_generic_reloc, /* special_function */ 354 "R_LM32_LO16", /* name */ 355 FALSE, /* partial_inplace */ 356 0, /* src_mask */ 357 0xffff, /* dst_mask */ 358 FALSE), /* pcrel_offset */ 359 360 HOWTO (R_LM32_GPREL16, /* type */ 361 0, /* rightshift */ 362 2, /* size (0 = byte, 1 = short, 2 = long) */ 363 16, /* bitsize */ 364 FALSE, /* pc_relative */ 365 0, /* bitpos */ 366 complain_overflow_dont, /* complain_on_overflow */ 367 lm32_elf_gprel_reloc, /* special_function */ 368 "R_LM32_GPREL16", /* name */ 369 FALSE, /* partial_inplace */ 370 0, /* src_mask */ 371 0xffff, /* dst_mask */ 372 FALSE), /* pcrel_offset */ 373 374 HOWTO (R_LM32_CALL, /* type */ 375 2, /* rightshift */ 376 2, /* size (0 = byte, 1 = short, 2 = long) */ 377 26, /* bitsize */ 378 TRUE, /* pc_relative */ 379 0, /* bitpos */ 380 complain_overflow_signed, /* complain_on_overflow */ 381 bfd_elf_generic_reloc, /* special_function */ 382 "R_LM32_CALL", /* name */ 383 FALSE, /* partial_inplace */ 384 0, /* src_mask */ 385 0x3ffffff, /* dst_mask */ 386 TRUE), /* pcrel_offset */ 387 388 HOWTO (R_LM32_BRANCH, /* type */ 389 2, /* rightshift */ 390 2, /* size (0 = byte, 1 = short, 2 = long) */ 391 16, /* bitsize */ 392 TRUE, /* pc_relative */ 393 0, /* bitpos */ 394 complain_overflow_signed, /* complain_on_overflow */ 395 bfd_elf_generic_reloc, /* special_function */ 396 "R_LM32_BRANCH", /* name */ 397 FALSE, /* partial_inplace */ 398 0, /* src_mask */ 399 0xffff, /* dst_mask */ 400 TRUE), /* pcrel_offset */ 401 402 /* GNU extension to record C++ vtable hierarchy. */ 403 HOWTO (R_LM32_GNU_VTINHERIT, /* type */ 404 0, /* rightshift */ 405 2, /* size (0 = byte, 1 = short, 2 = long) */ 406 0, /* bitsize */ 407 FALSE, /* pc_relative */ 408 0, /* bitpos */ 409 complain_overflow_dont, /* complain_on_overflow */ 410 NULL, /* special_function */ 411 "R_LM32_GNU_VTINHERIT", /* name */ 412 FALSE, /* partial_inplace */ 413 0, /* src_mask */ 414 0, /* dst_mask */ 415 FALSE), /* pcrel_offset */ 416 417 /* GNU extension to record C++ vtable member usage. */ 418 HOWTO (R_LM32_GNU_VTENTRY, /* type */ 419 0, /* rightshift */ 420 2, /* size (0 = byte, 1 = short, 2 = long) */ 421 0, /* bitsize */ 422 FALSE, /* pc_relative */ 423 0, /* bitpos */ 424 complain_overflow_dont, /* complain_on_overflow */ 425 _bfd_elf_rel_vtable_reloc_fn,/* special_function */ 426 "R_LM32_GNU_VTENTRY", /* name */ 427 FALSE, /* partial_inplace */ 428 0, /* src_mask */ 429 0, /* dst_mask */ 430 FALSE), /* pcrel_offset */ 431 432 HOWTO (R_LM32_16_GOT, /* type */ 433 0, /* rightshift */ 434 2, /* size (0 = byte, 1 = short, 2 = long) */ 435 16, /* bitsize */ 436 FALSE, /* pc_relative */ 437 0, /* bitpos */ 438 complain_overflow_signed, /* complain_on_overflow */ 439 bfd_elf_generic_reloc, /* special_function */ 440 "R_LM32_16_GOT", /* name */ 441 FALSE, /* partial_inplace */ 442 0, /* src_mask */ 443 0xffff, /* dst_mask */ 444 FALSE), /* pcrel_offset */ 445 446 HOWTO (R_LM32_GOTOFF_HI16, /* type */ 447 16, /* rightshift */ 448 2, /* size (0 = byte, 1 = short, 2 = long) */ 449 16, /* bitsize */ 450 FALSE, /* pc_relative */ 451 0, /* bitpos */ 452 complain_overflow_dont, /* complain_on_overflow */ 453 bfd_elf_generic_reloc, /* special_function */ 454 "R_LM32_GOTOFF_HI16", /* name */ 455 FALSE, /* partial_inplace */ 456 0xffff, /* src_mask */ 457 0xffff, /* dst_mask */ 458 FALSE), /* pcrel_offset */ 459 460 HOWTO (R_LM32_GOTOFF_LO16, /* type */ 461 0, /* rightshift */ 462 2, /* size (0 = byte, 1 = short, 2 = long) */ 463 16, /* bitsize */ 464 FALSE, /* pc_relative */ 465 0, /* bitpos */ 466 complain_overflow_dont, /* complain_on_overflow */ 467 bfd_elf_generic_reloc, /* special_function */ 468 "R_LM32_GOTOFF_LO16", /* name */ 469 FALSE, /* partial_inplace */ 470 0xffff, /* src_mask */ 471 0xffff, /* dst_mask */ 472 FALSE), /* pcrel_offset */ 473 474 HOWTO (R_LM32_COPY, /* type */ 475 0, /* rightshift */ 476 2, /* size (0 = byte, 1 = short, 2 = long) */ 477 32, /* bitsize */ 478 FALSE, /* pc_relative */ 479 0, /* bitpos */ 480 complain_overflow_bitfield, /* complain_on_overflow */ 481 bfd_elf_generic_reloc, /* special_function */ 482 "R_LM32_COPY", /* name */ 483 FALSE, /* partial_inplace */ 484 0xffffffff, /* src_mask */ 485 0xffffffff, /* dst_mask */ 486 FALSE), /* pcrel_offset */ 487 488 HOWTO (R_LM32_GLOB_DAT, /* type */ 489 0, /* rightshift */ 490 2, /* size (0 = byte, 1 = short, 2 = long) */ 491 32, /* bitsize */ 492 FALSE, /* pc_relative */ 493 0, /* bitpos */ 494 complain_overflow_bitfield, /* complain_on_overflow */ 495 bfd_elf_generic_reloc, /* special_function */ 496 "R_LM32_GLOB_DAT", /* name */ 497 FALSE, /* partial_inplace */ 498 0xffffffff, /* src_mask */ 499 0xffffffff, /* dst_mask */ 500 FALSE), /* pcrel_offset */ 501 502 HOWTO (R_LM32_JMP_SLOT, /* type */ 503 0, /* rightshift */ 504 2, /* size (0 = byte, 1 = short, 2 = long) */ 505 32, /* bitsize */ 506 FALSE, /* pc_relative */ 507 0, /* bitpos */ 508 complain_overflow_bitfield, /* complain_on_overflow */ 509 bfd_elf_generic_reloc, /* special_function */ 510 "R_LM32_JMP_SLOT", /* name */ 511 FALSE, /* partial_inplace */ 512 0xffffffff, /* src_mask */ 513 0xffffffff, /* dst_mask */ 514 FALSE), /* pcrel_offset */ 515 516 HOWTO (R_LM32_RELATIVE, /* type */ 517 0, /* rightshift */ 518 2, /* size (0 = byte, 1 = short, 2 = long) */ 519 32, /* bitsize */ 520 FALSE, /* pc_relative */ 521 0, /* bitpos */ 522 complain_overflow_bitfield, /* complain_on_overflow */ 523 bfd_elf_generic_reloc, /* special_function */ 524 "R_LM32_RELATIVE", /* name */ 525 FALSE, /* partial_inplace */ 526 0xffffffff, /* src_mask */ 527 0xffffffff, /* dst_mask */ 528 FALSE), /* pcrel_offset */ 529 530 }; 531 532 /* Map BFD reloc types to lm32 ELF reloc types. */ 533 534 struct lm32_reloc_map 535 { 536 bfd_reloc_code_real_type bfd_reloc_val; 537 unsigned char elf_reloc_val; 538 }; 539 540 static const struct lm32_reloc_map lm32_reloc_map[] = 541 { 542 { BFD_RELOC_NONE, R_LM32_NONE }, 543 { BFD_RELOC_8, R_LM32_8 }, 544 { BFD_RELOC_16, R_LM32_16 }, 545 { BFD_RELOC_32, R_LM32_32 }, 546 { BFD_RELOC_HI16, R_LM32_HI16 }, 547 { BFD_RELOC_LO16, R_LM32_LO16 }, 548 { BFD_RELOC_GPREL16, R_LM32_GPREL16 }, 549 { BFD_RELOC_LM32_CALL, R_LM32_CALL }, 550 { BFD_RELOC_LM32_BRANCH, R_LM32_BRANCH }, 551 { BFD_RELOC_VTABLE_INHERIT, R_LM32_GNU_VTINHERIT }, 552 { BFD_RELOC_VTABLE_ENTRY, R_LM32_GNU_VTENTRY }, 553 { BFD_RELOC_LM32_16_GOT, R_LM32_16_GOT }, 554 { BFD_RELOC_LM32_GOTOFF_HI16, R_LM32_GOTOFF_HI16 }, 555 { BFD_RELOC_LM32_GOTOFF_LO16, R_LM32_GOTOFF_LO16 }, 556 { BFD_RELOC_LM32_COPY, R_LM32_COPY }, 557 { BFD_RELOC_LM32_GLOB_DAT, R_LM32_GLOB_DAT }, 558 { BFD_RELOC_LM32_JMP_SLOT, R_LM32_JMP_SLOT }, 559 { BFD_RELOC_LM32_RELATIVE, R_LM32_RELATIVE }, 560 }; 561 562 static reloc_howto_type * 563 lm32_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 564 bfd_reloc_code_real_type code) 565 { 566 unsigned int i; 567 568 for (i = 0; i < sizeof (lm32_reloc_map) / sizeof (lm32_reloc_map[0]); i++) 569 if (lm32_reloc_map[i].bfd_reloc_val == code) 570 return &lm32_elf_howto_table[lm32_reloc_map[i].elf_reloc_val]; 571 return NULL; 572 } 573 574 static reloc_howto_type * 575 lm32_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 576 const char *r_name) 577 { 578 unsigned int i; 579 580 for (i = 0; 581 i < sizeof (lm32_elf_howto_table) / sizeof (lm32_elf_howto_table[0]); 582 i++) 583 if (lm32_elf_howto_table[i].name != NULL 584 && strcasecmp (lm32_elf_howto_table[i].name, r_name) == 0) 585 return &lm32_elf_howto_table[i]; 586 587 return NULL; 588 } 589 590 591 /* Set the howto pointer for an Lattice Mico32 ELF reloc. */ 592 593 static void 594 lm32_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, 595 arelent *cache_ptr, 596 Elf_Internal_Rela *dst) 597 { 598 unsigned int r_type; 599 600 r_type = ELF32_R_TYPE (dst->r_info); 601 BFD_ASSERT (r_type < (unsigned int) R_LM32_max); 602 cache_ptr->howto = &lm32_elf_howto_table[r_type]; 603 } 604 605 /* Set the right machine number for an Lattice Mico32 ELF file. */ 606 607 static bfd_boolean 608 lm32_elf_object_p (bfd *abfd) 609 { 610 return bfd_default_set_arch_mach (abfd, bfd_arch_lm32, bfd_mach_lm32); 611 } 612 613 /* Set machine type flags just before file is written out. */ 614 615 static void 616 lm32_elf_final_write_processing (bfd *abfd, bfd_boolean linker ATTRIBUTE_UNUSED) 617 { 618 elf_elfheader (abfd)->e_machine = EM_LATTICEMICO32; 619 elf_elfheader (abfd)->e_flags &=~ EF_LM32_MACH; 620 switch (bfd_get_mach (abfd)) 621 { 622 case bfd_mach_lm32: 623 elf_elfheader (abfd)->e_flags |= E_LM32_MACH; 624 break; 625 default: 626 abort (); 627 } 628 } 629 630 /* Set the GP value for OUTPUT_BFD. Returns FALSE if this is a 631 dangerous relocation. */ 632 633 static bfd_boolean 634 lm32_elf_assign_gp (bfd *output_bfd, bfd_vma *pgp) 635 { 636 unsigned int count; 637 asymbol **sym; 638 unsigned int i; 639 640 /* If we've already figured out what GP will be, just return it. */ 641 *pgp = _bfd_get_gp_value (output_bfd); 642 if (*pgp) 643 return TRUE; 644 645 count = bfd_get_symcount (output_bfd); 646 sym = bfd_get_outsymbols (output_bfd); 647 648 /* The linker script will have created a symbol named `_gp' with the 649 appropriate value. */ 650 if (sym == NULL) 651 i = count; 652 else 653 { 654 for (i = 0; i < count; i++, sym++) 655 { 656 const char *name; 657 658 name = bfd_asymbol_name (*sym); 659 if (*name == '_' && strcmp (name, "_gp") == 0) 660 { 661 *pgp = bfd_asymbol_value (*sym); 662 _bfd_set_gp_value (output_bfd, *pgp); 663 break; 664 } 665 } 666 } 667 668 if (i >= count) 669 { 670 /* Only get the error once. */ 671 *pgp = 4; 672 _bfd_set_gp_value (output_bfd, *pgp); 673 return FALSE; 674 } 675 676 return TRUE; 677 } 678 679 /* We have to figure out the gp value, so that we can adjust the 680 symbol value correctly. We look up the symbol _gp in the output 681 BFD. If we can't find it, we're stuck. We cache it in the ELF 682 target data. We don't need to adjust the symbol value for an 683 external symbol if we are producing relocatable output. */ 684 685 static bfd_reloc_status_type 686 lm32_elf_final_gp (bfd *output_bfd, asymbol *symbol, bfd_boolean relocatable, 687 char **error_message, bfd_vma *pgp) 688 { 689 if (bfd_is_und_section (symbol->section) && !relocatable) 690 { 691 *pgp = 0; 692 return bfd_reloc_undefined; 693 } 694 695 *pgp = _bfd_get_gp_value (output_bfd); 696 if (*pgp == 0 && (!relocatable || (symbol->flags & BSF_SECTION_SYM) != 0)) 697 { 698 if (relocatable) 699 { 700 /* Make up a value. */ 701 *pgp = symbol->section->output_section->vma + 0x4000; 702 _bfd_set_gp_value (output_bfd, *pgp); 703 } 704 else if (!lm32_elf_assign_gp (output_bfd, pgp)) 705 { 706 *error_message = 707 (char *) 708 _("global pointer relative relocation when _gp not defined"); 709 return bfd_reloc_dangerous; 710 } 711 } 712 713 return bfd_reloc_ok; 714 } 715 716 static bfd_reloc_status_type 717 lm32_elf_do_gprel_relocate (bfd *abfd, 718 reloc_howto_type *howto, 719 asection *input_section ATTRIBUTE_UNUSED, 720 bfd_byte *data, 721 bfd_vma offset, 722 bfd_vma symbol_value, 723 bfd_vma addend) 724 { 725 return _bfd_final_link_relocate (howto, abfd, input_section, 726 data, offset, symbol_value, addend); 727 } 728 729 static bfd_reloc_status_type 730 lm32_elf_gprel_reloc (bfd *abfd, 731 arelent *reloc_entry, 732 asymbol *symbol, 733 void *data, 734 asection *input_section, 735 bfd *output_bfd, 736 char **msg) 737 { 738 bfd_vma relocation; 739 bfd_vma gp; 740 bfd_reloc_status_type r; 741 742 if (output_bfd != (bfd *) NULL 743 && (symbol->flags & BSF_SECTION_SYM) == 0 744 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0)) 745 { 746 reloc_entry->address += input_section->output_offset; 747 return bfd_reloc_ok; 748 } 749 750 if (output_bfd != NULL) 751 return bfd_reloc_ok; 752 753 relocation = symbol->value 754 + symbol->section->output_section->vma + symbol->section->output_offset; 755 756 if ((r = 757 lm32_elf_final_gp (abfd, symbol, FALSE, msg, &gp)) == bfd_reloc_ok) 758 { 759 relocation = relocation + reloc_entry->addend - gp; 760 reloc_entry->addend = 0; 761 if ((signed) relocation < -32768 || (signed) relocation > 32767) 762 { 763 *msg = _("global pointer relative address out of range"); 764 r = bfd_reloc_outofrange; 765 } 766 else 767 { 768 r = lm32_elf_do_gprel_relocate (abfd, reloc_entry->howto, 769 input_section, 770 data, reloc_entry->address, 771 relocation, reloc_entry->addend); 772 } 773 } 774 775 return r; 776 } 777 778 /* Find the segment number in which OSEC, and output section, is 779 located. */ 780 781 static unsigned 782 _lm32fdpic_osec_to_segment (bfd *output_bfd, asection *osec) 783 { 784 struct elf_segment_map *m; 785 Elf_Internal_Phdr *p; 786 787 /* Find the segment that contains the output_section. */ 788 for (m = elf_tdata (output_bfd)->segment_map, 789 p = elf_tdata (output_bfd)->phdr; 790 m != NULL; 791 m = m->next, p++) 792 { 793 int i; 794 795 for (i = m->count - 1; i >= 0; i--) 796 if (m->sections[i] == osec) 797 break; 798 799 if (i >= 0) 800 break; 801 } 802 803 return p - elf_tdata (output_bfd)->phdr; 804 } 805 806 /* Determine if an output section is read-only. */ 807 808 inline static bfd_boolean 809 _lm32fdpic_osec_readonly_p (bfd *output_bfd, asection *osec) 810 { 811 unsigned seg = _lm32fdpic_osec_to_segment (output_bfd, osec); 812 813 return ! (elf_tdata (output_bfd)->phdr[seg].p_flags & PF_W); 814 } 815 816 /* Relocate a section */ 817 818 static bfd_boolean 819 lm32_elf_relocate_section (bfd *output_bfd, 820 struct bfd_link_info *info, 821 bfd *input_bfd, 822 asection *input_section, 823 bfd_byte *contents, 824 Elf_Internal_Rela *relocs, 825 Elf_Internal_Sym *local_syms, 826 asection **local_sections) 827 { 828 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 829 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); 830 Elf_Internal_Rela *rel, *relend; 831 struct elf_lm32_link_hash_table *htab = lm32_elf_hash_table (info); 832 bfd *dynobj; 833 bfd_vma *local_got_offsets; 834 asection *sgot; 835 836 if (htab == NULL) 837 return FALSE; 838 839 dynobj = htab->root.dynobj; 840 local_got_offsets = elf_local_got_offsets (input_bfd); 841 842 sgot = htab->sgot; 843 844 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 845 sym_hashes = elf_sym_hashes (input_bfd); 846 847 rel = relocs; 848 relend = relocs + input_section->reloc_count; 849 for (; rel < relend; rel++) 850 { 851 reloc_howto_type *howto; 852 unsigned int r_type; 853 unsigned long r_symndx; 854 Elf_Internal_Sym *sym; 855 asection *sec; 856 struct elf_link_hash_entry *h; 857 bfd_vma relocation; 858 bfd_vma gp; 859 bfd_reloc_status_type r; 860 const char *name = NULL; 861 862 r_symndx = ELF32_R_SYM (rel->r_info); 863 r_type = ELF32_R_TYPE (rel->r_info); 864 865 if (r_type == R_LM32_GNU_VTENTRY 866 || r_type == R_LM32_GNU_VTINHERIT ) 867 continue; 868 869 h = NULL; 870 sym = NULL; 871 sec = NULL; 872 873 howto = lm32_elf_howto_table + r_type; 874 875 if (r_symndx < symtab_hdr->sh_info) 876 { 877 /* It's a local symbol. */ 878 sym = local_syms + r_symndx; 879 sec = local_sections[r_symndx]; 880 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 881 name = bfd_elf_string_from_elf_section 882 (input_bfd, symtab_hdr->sh_link, sym->st_name); 883 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; 884 } 885 else 886 { 887 /* It's a global symbol. */ 888 bfd_boolean unresolved_reloc; 889 bfd_boolean warned; 890 891 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 892 r_symndx, symtab_hdr, sym_hashes, 893 h, sec, relocation, 894 unresolved_reloc, warned); 895 name = h->root.root.string; 896 } 897 898 if (sec != NULL && discarded_section (sec)) 899 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 900 rel, 1, relend, howto, 0, contents); 901 902 if (info->relocatable) 903 { 904 /* This is a relocatable link. We don't have to change 905 anything, unless the reloc is against a section symbol, 906 in which case we have to adjust according to where the 907 section symbol winds up in the output section. */ 908 if (sym == NULL || ELF_ST_TYPE (sym->st_info) != STT_SECTION) 909 continue; 910 911 /* If partial_inplace, we need to store any additional addend 912 back in the section. */ 913 if (! howto->partial_inplace) 914 continue; 915 916 /* Shouldn't reach here. */ 917 abort (); 918 r = bfd_reloc_ok; 919 } 920 else 921 { 922 switch (howto->type) 923 { 924 case R_LM32_GPREL16: 925 if (!lm32_elf_assign_gp (output_bfd, &gp)) 926 r = bfd_reloc_dangerous; 927 else 928 { 929 relocation = relocation + rel->r_addend - gp; 930 rel->r_addend = 0; 931 if ((signed)relocation < -32768 || (signed)relocation > 32767) 932 r = bfd_reloc_outofrange; 933 else 934 { 935 r = _bfd_final_link_relocate (howto, input_bfd, 936 input_section, contents, 937 rel->r_offset, relocation, 938 rel->r_addend); 939 } 940 } 941 break; 942 case R_LM32_16_GOT: 943 /* Relocation is to the entry for this symbol in the global 944 offset table. */ 945 BFD_ASSERT (sgot != NULL); 946 if (h != NULL) 947 { 948 bfd_boolean dyn; 949 bfd_vma off; 950 951 off = h->got.offset; 952 BFD_ASSERT (off != (bfd_vma) -1); 953 954 dyn = htab->root.dynamic_sections_created; 955 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 956 || (info->shared 957 && (info->symbolic 958 || h->dynindx == -1 959 || h->forced_local) 960 && h->def_regular)) 961 { 962 /* This is actually a static link, or it is a 963 -Bsymbolic link and the symbol is defined 964 locally, or the symbol was forced to be local 965 because of a version file. We must initialize 966 this entry in the global offset table. Since the 967 offset must always be a multiple of 4, we use the 968 least significant bit to record whether we have 969 initialized it already. 970 971 When doing a dynamic link, we create a .rela.got 972 relocation entry to initialize the value. This 973 is done in the finish_dynamic_symbol routine. */ 974 if ((off & 1) != 0) 975 off &= ~1; 976 else 977 { 978 /* Write entry in GOT */ 979 bfd_put_32 (output_bfd, relocation, 980 sgot->contents + off); 981 /* Create entry in .rofixup pointing to GOT entry. */ 982 if (IS_FDPIC (output_bfd) && h->root.type != bfd_link_hash_undefweak) 983 { 984 _lm32fdpic_add_rofixup (output_bfd, 985 lm32fdpic_fixup32_section 986 (info), 987 sgot->output_section->vma 988 + sgot->output_offset 989 + off); 990 } 991 /* Mark GOT entry as having been written. */ 992 h->got.offset |= 1; 993 } 994 } 995 996 relocation = sgot->output_offset + off; 997 } 998 else 999 { 1000 bfd_vma off; 1001 bfd_byte *loc; 1002 1003 BFD_ASSERT (local_got_offsets != NULL 1004 && local_got_offsets[r_symndx] != (bfd_vma) -1); 1005 1006 /* Get offset into GOT table. */ 1007 off = local_got_offsets[r_symndx]; 1008 1009 /* The offset must always be a multiple of 4. We use 1010 the least significant bit to record whether we have 1011 already processed this entry. */ 1012 if ((off & 1) != 0) 1013 off &= ~1; 1014 else 1015 { 1016 /* Write entry in GOT. */ 1017 bfd_put_32 (output_bfd, relocation, sgot->contents + off); 1018 /* Create entry in .rofixup pointing to GOT entry. */ 1019 if (IS_FDPIC (output_bfd)) 1020 { 1021 _lm32fdpic_add_rofixup (output_bfd, 1022 lm32fdpic_fixup32_section 1023 (info), 1024 sgot->output_section->vma 1025 + sgot->output_offset 1026 + off); 1027 } 1028 1029 if (info->shared) 1030 { 1031 asection *srelgot; 1032 Elf_Internal_Rela outrel; 1033 1034 /* We need to generate a R_LM32_RELATIVE reloc 1035 for the dynamic linker. */ 1036 srelgot = bfd_get_linker_section (dynobj, 1037 ".rela.got"); 1038 BFD_ASSERT (srelgot != NULL); 1039 1040 outrel.r_offset = (sgot->output_section->vma 1041 + sgot->output_offset 1042 + off); 1043 outrel.r_info = ELF32_R_INFO (0, R_LM32_RELATIVE); 1044 outrel.r_addend = relocation; 1045 loc = srelgot->contents; 1046 loc += srelgot->reloc_count * sizeof (Elf32_External_Rela); 1047 bfd_elf32_swap_reloca_out (output_bfd, &outrel,loc); 1048 ++srelgot->reloc_count; 1049 } 1050 1051 local_got_offsets[r_symndx] |= 1; 1052 } 1053 1054 1055 relocation = sgot->output_offset + off; 1056 } 1057 1058 /* Addend should be zero. */ 1059 if (rel->r_addend != 0) 1060 (*_bfd_error_handler) (_("internal error: addend should be zero for R_LM32_16_GOT")); 1061 1062 r = _bfd_final_link_relocate (howto, 1063 input_bfd, 1064 input_section, 1065 contents, 1066 rel->r_offset, 1067 relocation, 1068 rel->r_addend); 1069 break; 1070 1071 case R_LM32_GOTOFF_LO16: 1072 case R_LM32_GOTOFF_HI16: 1073 /* Relocation is offset from GOT. */ 1074 BFD_ASSERT (sgot != NULL); 1075 relocation -= sgot->output_section->vma; 1076 /* Account for sign-extension. */ 1077 if ((r_type == R_LM32_GOTOFF_HI16) 1078 && ((relocation + rel->r_addend) & 0x8000)) 1079 rel->r_addend += 0x10000; 1080 r = _bfd_final_link_relocate (howto, 1081 input_bfd, 1082 input_section, 1083 contents, 1084 rel->r_offset, 1085 relocation, 1086 rel->r_addend); 1087 break; 1088 1089 case R_LM32_32: 1090 if (IS_FDPIC (output_bfd)) 1091 { 1092 if ((!h) || (h && h->root.type != bfd_link_hash_undefweak)) 1093 { 1094 /* Only create .rofixup entries for relocs in loadable sections. */ 1095 if ((bfd_get_section_flags (output_bfd, input_section->output_section) 1096 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) 1097 1098 { 1099 /* Check address to be modified is writable. */ 1100 if (_lm32fdpic_osec_readonly_p (output_bfd, 1101 input_section 1102 ->output_section)) 1103 { 1104 info->callbacks->warning 1105 (info, 1106 _("cannot emit dynamic relocations in read-only section"), 1107 name, input_bfd, input_section, rel->r_offset); 1108 return FALSE; 1109 } 1110 /* Create entry in .rofixup section. */ 1111 _lm32fdpic_add_rofixup (output_bfd, 1112 lm32fdpic_fixup32_section (info), 1113 input_section->output_section->vma 1114 + input_section->output_offset 1115 + rel->r_offset); 1116 } 1117 } 1118 } 1119 /* Fall through. */ 1120 1121 default: 1122 r = _bfd_final_link_relocate (howto, 1123 input_bfd, 1124 input_section, 1125 contents, 1126 rel->r_offset, 1127 relocation, 1128 rel->r_addend); 1129 break; 1130 } 1131 } 1132 1133 if (r != bfd_reloc_ok) 1134 { 1135 const char *msg = NULL; 1136 arelent bfd_reloc; 1137 1138 lm32_info_to_howto_rela (input_bfd, &bfd_reloc, rel); 1139 howto = bfd_reloc.howto; 1140 1141 if (h != NULL) 1142 name = h->root.root.string; 1143 else 1144 { 1145 name = (bfd_elf_string_from_elf_section 1146 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 1147 if (name == NULL || *name == '\0') 1148 name = bfd_section_name (input_bfd, sec); 1149 } 1150 1151 switch (r) 1152 { 1153 case bfd_reloc_overflow: 1154 if ((h != NULL) 1155 && (h->root.type == bfd_link_hash_undefweak)) 1156 break; 1157 if (! ((*info->callbacks->reloc_overflow) 1158 (info, (h ? &h->root : NULL), name, howto->name, 1159 (bfd_vma) 0, input_bfd, input_section, rel->r_offset))) 1160 return FALSE; 1161 break; 1162 1163 case bfd_reloc_undefined: 1164 if (! ((*info->callbacks->undefined_symbol) 1165 (info, name, input_bfd, input_section, 1166 rel->r_offset, TRUE))) 1167 return FALSE; 1168 break; 1169 1170 case bfd_reloc_outofrange: 1171 msg = _("internal error: out of range error"); 1172 goto common_error; 1173 1174 case bfd_reloc_notsupported: 1175 msg = _("internal error: unsupported relocation error"); 1176 goto common_error; 1177 1178 case bfd_reloc_dangerous: 1179 msg = _("internal error: dangerous error"); 1180 goto common_error; 1181 1182 default: 1183 msg = _("internal error: unknown error"); 1184 /* fall through */ 1185 1186 common_error: 1187 if (!((*info->callbacks->warning) 1188 (info, msg, name, input_bfd, input_section, 1189 rel->r_offset))) 1190 return FALSE; 1191 break; 1192 } 1193 } 1194 } 1195 1196 return TRUE; 1197 } 1198 1199 static asection * 1200 lm32_elf_gc_mark_hook (asection *sec, 1201 struct bfd_link_info *info, 1202 Elf_Internal_Rela *rel, 1203 struct elf_link_hash_entry *h, 1204 Elf_Internal_Sym *sym) 1205 { 1206 if (h != NULL) 1207 switch (ELF32_R_TYPE (rel->r_info)) 1208 { 1209 case R_LM32_GNU_VTINHERIT: 1210 case R_LM32_GNU_VTENTRY: 1211 return NULL; 1212 } 1213 1214 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1215 } 1216 1217 static bfd_boolean 1218 lm32_elf_gc_sweep_hook (bfd *abfd, 1219 struct bfd_link_info *info ATTRIBUTE_UNUSED, 1220 asection *sec, 1221 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) 1222 { 1223 /* Update the got entry reference counts for the section being removed. */ 1224 Elf_Internal_Shdr *symtab_hdr; 1225 struct elf_link_hash_entry **sym_hashes; 1226 bfd_signed_vma *local_got_refcounts; 1227 const Elf_Internal_Rela *rel, *relend; 1228 1229 elf_section_data (sec)->local_dynrel = NULL; 1230 1231 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1232 sym_hashes = elf_sym_hashes (abfd); 1233 local_got_refcounts = elf_local_got_refcounts (abfd); 1234 1235 relend = relocs + sec->reloc_count; 1236 for (rel = relocs; rel < relend; rel++) 1237 { 1238 unsigned long r_symndx; 1239 struct elf_link_hash_entry *h = NULL; 1240 1241 r_symndx = ELF32_R_SYM (rel->r_info); 1242 if (r_symndx >= symtab_hdr->sh_info) 1243 { 1244 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1245 while (h->root.type == bfd_link_hash_indirect 1246 || h->root.type == bfd_link_hash_warning) 1247 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1248 } 1249 1250 switch (ELF32_R_TYPE (rel->r_info)) 1251 { 1252 case R_LM32_16_GOT: 1253 if (h != NULL) 1254 { 1255 if (h->got.refcount > 0) 1256 h->got.refcount--; 1257 } 1258 else 1259 { 1260 if (local_got_refcounts && local_got_refcounts[r_symndx] > 0) 1261 local_got_refcounts[r_symndx]--; 1262 } 1263 break; 1264 1265 default: 1266 break; 1267 } 1268 } 1269 return TRUE; 1270 } 1271 1272 /* Look through the relocs for a section during the first phase. */ 1273 1274 static bfd_boolean 1275 lm32_elf_check_relocs (bfd *abfd, 1276 struct bfd_link_info *info, 1277 asection *sec, 1278 const Elf_Internal_Rela *relocs) 1279 { 1280 Elf_Internal_Shdr *symtab_hdr; 1281 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 1282 const Elf_Internal_Rela *rel; 1283 const Elf_Internal_Rela *rel_end; 1284 struct elf_lm32_link_hash_table *htab; 1285 bfd *dynobj; 1286 1287 if (info->relocatable) 1288 return TRUE; 1289 1290 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1291 sym_hashes = elf_sym_hashes (abfd); 1292 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); 1293 if (!elf_bad_symtab (abfd)) 1294 sym_hashes_end -= symtab_hdr->sh_info; 1295 1296 htab = lm32_elf_hash_table (info); 1297 if (htab == NULL) 1298 return FALSE; 1299 1300 dynobj = htab->root.dynobj; 1301 1302 rel_end = relocs + sec->reloc_count; 1303 for (rel = relocs; rel < rel_end; rel++) 1304 { 1305 int r_type; 1306 struct elf_link_hash_entry *h; 1307 unsigned long r_symndx; 1308 1309 r_symndx = ELF32_R_SYM (rel->r_info); 1310 r_type = ELF32_R_TYPE (rel->r_info); 1311 if (r_symndx < symtab_hdr->sh_info) 1312 h = NULL; 1313 else 1314 { 1315 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1316 while (h->root.type == bfd_link_hash_indirect 1317 || h->root.type == bfd_link_hash_warning) 1318 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1319 } 1320 1321 /* Some relocs require a global offset table. */ 1322 if (htab->sgot == NULL) 1323 { 1324 switch (r_type) 1325 { 1326 case R_LM32_16_GOT: 1327 case R_LM32_GOTOFF_HI16: 1328 case R_LM32_GOTOFF_LO16: 1329 if (dynobj == NULL) 1330 htab->root.dynobj = dynobj = abfd; 1331 if (! create_got_section (dynobj, info)) 1332 return FALSE; 1333 break; 1334 } 1335 } 1336 1337 /* Some relocs require a rofixup table. */ 1338 if (IS_FDPIC (abfd)) 1339 { 1340 switch (r_type) 1341 { 1342 case R_LM32_32: 1343 /* FDPIC requires a GOT if there is a .rofixup section 1344 (Normal ELF doesn't). */ 1345 if (dynobj == NULL) 1346 htab->root.dynobj = dynobj = abfd; 1347 if (! create_got_section (dynobj, info)) 1348 return FALSE; 1349 /* Create .rofixup section */ 1350 if (htab->sfixup32 == NULL) 1351 { 1352 if (! create_rofixup_section (dynobj, info)) 1353 return FALSE; 1354 } 1355 break; 1356 case R_LM32_16_GOT: 1357 case R_LM32_GOTOFF_HI16: 1358 case R_LM32_GOTOFF_LO16: 1359 /* Create .rofixup section. */ 1360 if (htab->sfixup32 == NULL) 1361 { 1362 if (dynobj == NULL) 1363 htab->root.dynobj = dynobj = abfd; 1364 if (! create_rofixup_section (dynobj, info)) 1365 return FALSE; 1366 } 1367 break; 1368 } 1369 } 1370 1371 switch (r_type) 1372 { 1373 case R_LM32_16_GOT: 1374 if (h != NULL) 1375 h->got.refcount += 1; 1376 else 1377 { 1378 bfd_signed_vma *local_got_refcounts; 1379 1380 /* This is a global offset table entry for a local symbol. */ 1381 local_got_refcounts = elf_local_got_refcounts (abfd); 1382 if (local_got_refcounts == NULL) 1383 { 1384 bfd_size_type size; 1385 1386 size = symtab_hdr->sh_info; 1387 size *= sizeof (bfd_signed_vma); 1388 local_got_refcounts = bfd_zalloc (abfd, size); 1389 if (local_got_refcounts == NULL) 1390 return FALSE; 1391 elf_local_got_refcounts (abfd) = local_got_refcounts; 1392 } 1393 local_got_refcounts[r_symndx] += 1; 1394 } 1395 break; 1396 1397 /* This relocation describes the C++ object vtable hierarchy. 1398 Reconstruct it for later use during GC. */ 1399 case R_LM32_GNU_VTINHERIT: 1400 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1401 return FALSE; 1402 break; 1403 1404 /* This relocation describes which C++ vtable entries are actually 1405 used. Record for later use during GC. */ 1406 case R_LM32_GNU_VTENTRY: 1407 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1408 return FALSE; 1409 break; 1410 1411 } 1412 } 1413 1414 return TRUE; 1415 } 1416 1417 /* Finish up the dynamic sections. */ 1418 1419 static bfd_boolean 1420 lm32_elf_finish_dynamic_sections (bfd *output_bfd, 1421 struct bfd_link_info *info) 1422 { 1423 struct elf_lm32_link_hash_table *htab; 1424 bfd *dynobj; 1425 asection *sdyn; 1426 asection *sgot; 1427 1428 htab = lm32_elf_hash_table (info); 1429 if (htab == NULL) 1430 return FALSE; 1431 1432 dynobj = htab->root.dynobj; 1433 1434 sgot = htab->sgotplt; 1435 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 1436 1437 if (htab->root.dynamic_sections_created) 1438 { 1439 asection *splt; 1440 Elf32_External_Dyn *dyncon, *dynconend; 1441 1442 BFD_ASSERT (sgot != NULL && sdyn != NULL); 1443 1444 dyncon = (Elf32_External_Dyn *) sdyn->contents; 1445 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 1446 1447 for (; dyncon < dynconend; dyncon++) 1448 { 1449 Elf_Internal_Dyn dyn; 1450 asection *s; 1451 1452 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 1453 1454 switch (dyn.d_tag) 1455 { 1456 default: 1457 break; 1458 1459 case DT_PLTGOT: 1460 s = htab->sgot->output_section; 1461 goto get_vma; 1462 case DT_JMPREL: 1463 s = htab->srelplt->output_section; 1464 get_vma: 1465 BFD_ASSERT (s != NULL); 1466 dyn.d_un.d_ptr = s->vma; 1467 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1468 break; 1469 1470 case DT_PLTRELSZ: 1471 s = htab->srelplt->output_section; 1472 BFD_ASSERT (s != NULL); 1473 dyn.d_un.d_val = s->size; 1474 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1475 break; 1476 1477 case DT_RELASZ: 1478 /* My reading of the SVR4 ABI indicates that the 1479 procedure linkage table relocs (DT_JMPREL) should be 1480 included in the overall relocs (DT_RELA). This is 1481 what Solaris does. However, UnixWare can not handle 1482 that case. Therefore, we override the DT_RELASZ entry 1483 here to make it not include the JMPREL relocs. Since 1484 the linker script arranges for .rela.plt to follow all 1485 other relocation sections, we don't have to worry 1486 about changing the DT_RELA entry. */ 1487 if (htab->srelplt != NULL) 1488 { 1489 s = htab->srelplt->output_section; 1490 dyn.d_un.d_val -= s->size; 1491 } 1492 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1493 break; 1494 } 1495 } 1496 1497 /* Fill in the first entry in the procedure linkage table. */ 1498 splt = htab->splt; 1499 if (splt && splt->size > 0) 1500 { 1501 if (info->shared) 1502 { 1503 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD0, splt->contents); 1504 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD1, splt->contents + 4); 1505 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD2, splt->contents + 8); 1506 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD3, splt->contents + 12); 1507 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD4, splt->contents + 16); 1508 } 1509 else 1510 { 1511 unsigned long addr; 1512 /* addr = .got + 4 */ 1513 addr = sgot->output_section->vma + sgot->output_offset + 4; 1514 bfd_put_32 (output_bfd, 1515 PLT0_ENTRY_WORD0 | ((addr >> 16) & 0xffff), 1516 splt->contents); 1517 bfd_put_32 (output_bfd, 1518 PLT0_ENTRY_WORD1 | (addr & 0xffff), 1519 splt->contents + 4); 1520 bfd_put_32 (output_bfd, PLT0_ENTRY_WORD2, splt->contents + 8); 1521 bfd_put_32 (output_bfd, PLT0_ENTRY_WORD3, splt->contents + 12); 1522 bfd_put_32 (output_bfd, PLT0_ENTRY_WORD4, splt->contents + 16); 1523 } 1524 1525 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 1526 PLT_ENTRY_SIZE; 1527 } 1528 } 1529 1530 /* Fill in the first three entries in the global offset table. */ 1531 if (sgot && sgot->size > 0) 1532 { 1533 if (sdyn == NULL) 1534 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 1535 else 1536 bfd_put_32 (output_bfd, 1537 sdyn->output_section->vma + sdyn->output_offset, 1538 sgot->contents); 1539 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 1540 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 1541 1542 /* FIXME: This can be null if create_dynamic_sections wasn't called. */ 1543 if (elf_section_data (sgot->output_section) != NULL) 1544 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 1545 } 1546 1547 if (lm32fdpic_fixup32_section (info)) 1548 { 1549 struct elf_link_hash_entry *hgot = elf_hash_table (info)->hgot; 1550 bfd_vma got_value = hgot->root.u.def.value 1551 + hgot->root.u.def.section->output_section->vma 1552 + hgot->root.u.def.section->output_offset; 1553 struct bfd_link_hash_entry *hend; 1554 1555 /* Last entry is pointer to GOT. */ 1556 _lm32fdpic_add_rofixup (output_bfd, lm32fdpic_fixup32_section (info), got_value); 1557 1558 /* Check we wrote enough entries. */ 1559 if (lm32fdpic_fixup32_section (info)->size 1560 != (lm32fdpic_fixup32_section (info)->reloc_count * 4)) 1561 { 1562 (*_bfd_error_handler) 1563 ("LINKER BUG: .rofixup section size mismatch: size/4 %d != relocs %d", 1564 lm32fdpic_fixup32_section (info)->size/4, 1565 lm32fdpic_fixup32_section (info)->reloc_count); 1566 return FALSE; 1567 } 1568 1569 hend = bfd_link_hash_lookup (info->hash, "__ROFIXUP_END__", 1570 FALSE, FALSE, TRUE); 1571 if (hend 1572 && (hend->type == bfd_link_hash_defined 1573 || hend->type == bfd_link_hash_defweak)) 1574 { 1575 bfd_vma value = 1576 lm32fdpic_fixup32_section (info)->output_section->vma 1577 + lm32fdpic_fixup32_section (info)->output_offset 1578 + lm32fdpic_fixup32_section (info)->size 1579 - hend->u.def.section->output_section->vma 1580 - hend->u.def.section->output_offset; 1581 BFD_ASSERT (hend->u.def.value == value); 1582 if (hend->u.def.value != value) 1583 { 1584 (*_bfd_error_handler) 1585 ("LINKER BUG: .rofixup section hend->u.def.value != value: %ld != %ld", hend->u.def.value, value); 1586 return FALSE; 1587 } 1588 } 1589 } 1590 1591 return TRUE; 1592 } 1593 1594 /* Finish up dynamic symbol handling. We set the contents of various 1595 dynamic sections here. */ 1596 1597 static bfd_boolean 1598 lm32_elf_finish_dynamic_symbol (bfd *output_bfd, 1599 struct bfd_link_info *info, 1600 struct elf_link_hash_entry *h, 1601 Elf_Internal_Sym *sym) 1602 { 1603 struct elf_lm32_link_hash_table *htab; 1604 bfd_byte *loc; 1605 1606 htab = lm32_elf_hash_table (info); 1607 if (htab == NULL) 1608 return FALSE; 1609 1610 if (h->plt.offset != (bfd_vma) -1) 1611 { 1612 asection *splt; 1613 asection *sgot; 1614 asection *srela; 1615 1616 bfd_vma plt_index; 1617 bfd_vma got_offset; 1618 Elf_Internal_Rela rela; 1619 1620 /* This symbol has an entry in the procedure linkage table. Set 1621 it up. */ 1622 BFD_ASSERT (h->dynindx != -1); 1623 1624 splt = htab->splt; 1625 sgot = htab->sgotplt; 1626 srela = htab->srelplt; 1627 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 1628 1629 /* Get the index in the procedure linkage table which 1630 corresponds to this symbol. This is the index of this symbol 1631 in all the symbols for which we are making plt entries. The 1632 first entry in the procedure linkage table is reserved. */ 1633 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1634 1635 /* Get the offset into the .got table of the entry that 1636 corresponds to this function. Each .got entry is 4 bytes. 1637 The first three are reserved. */ 1638 got_offset = (plt_index + 3) * 4; 1639 1640 /* Fill in the entry in the procedure linkage table. */ 1641 if (! info->shared) 1642 { 1643 /* TODO */ 1644 } 1645 else 1646 { 1647 /* TODO */ 1648 } 1649 1650 /* Fill in the entry in the global offset table. */ 1651 bfd_put_32 (output_bfd, 1652 (splt->output_section->vma 1653 + splt->output_offset 1654 + h->plt.offset 1655 + 12), /* same offset */ 1656 sgot->contents + got_offset); 1657 1658 /* Fill in the entry in the .rela.plt section. */ 1659 rela.r_offset = (sgot->output_section->vma 1660 + sgot->output_offset 1661 + got_offset); 1662 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_JMP_SLOT); 1663 rela.r_addend = 0; 1664 loc = srela->contents; 1665 loc += plt_index * sizeof (Elf32_External_Rela); 1666 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1667 1668 if (!h->def_regular) 1669 { 1670 /* Mark the symbol as undefined, rather than as defined in 1671 the .plt section. Leave the value alone. */ 1672 sym->st_shndx = SHN_UNDEF; 1673 } 1674 1675 } 1676 1677 if (h->got.offset != (bfd_vma) -1) 1678 { 1679 asection *sgot; 1680 asection *srela; 1681 Elf_Internal_Rela rela; 1682 1683 /* This symbol has an entry in the global offset table. Set it 1684 up. */ 1685 sgot = htab->sgot; 1686 srela = htab->srelgot; 1687 BFD_ASSERT (sgot != NULL && srela != NULL); 1688 1689 rela.r_offset = (sgot->output_section->vma 1690 + sgot->output_offset 1691 + (h->got.offset &~ 1)); 1692 1693 /* If this is a -Bsymbolic link, and the symbol is defined 1694 locally, we just want to emit a RELATIVE reloc. Likewise if 1695 the symbol was forced to be local because of a version file. 1696 The entry in the global offset table will already have been 1697 initialized in the relocate_section function. */ 1698 if (info->shared 1699 && (info->symbolic 1700 || h->dynindx == -1 1701 || h->forced_local) 1702 && h->def_regular) 1703 { 1704 rela.r_info = ELF32_R_INFO (0, R_LM32_RELATIVE); 1705 rela.r_addend = (h->root.u.def.value 1706 + h->root.u.def.section->output_section->vma 1707 + h->root.u.def.section->output_offset); 1708 } 1709 else 1710 { 1711 BFD_ASSERT ((h->got.offset & 1) == 0); 1712 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); 1713 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_GLOB_DAT); 1714 rela.r_addend = 0; 1715 } 1716 1717 loc = srela->contents; 1718 loc += srela->reloc_count * sizeof (Elf32_External_Rela); 1719 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1720 ++srela->reloc_count; 1721 } 1722 1723 if (h->needs_copy) 1724 { 1725 asection *s; 1726 Elf_Internal_Rela rela; 1727 1728 /* This symbols needs a copy reloc. Set it up. */ 1729 BFD_ASSERT (h->dynindx != -1 1730 && (h->root.type == bfd_link_hash_defined 1731 || h->root.type == bfd_link_hash_defweak)); 1732 1733 s = bfd_get_linker_section (htab->root.dynobj, ".rela.bss"); 1734 BFD_ASSERT (s != NULL); 1735 1736 rela.r_offset = (h->root.u.def.value 1737 + h->root.u.def.section->output_section->vma 1738 + h->root.u.def.section->output_offset); 1739 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_COPY); 1740 rela.r_addend = 0; 1741 loc = s->contents; 1742 loc += s->reloc_count * sizeof (Elf32_External_Rela); 1743 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1744 ++s->reloc_count; 1745 } 1746 1747 /* Mark some specially defined symbols as absolute. */ 1748 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 1749 || h == htab->root.hgot) 1750 sym->st_shndx = SHN_ABS; 1751 1752 return TRUE; 1753 } 1754 1755 static enum elf_reloc_type_class 1756 lm32_elf_reloc_type_class (const Elf_Internal_Rela *rela) 1757 { 1758 switch ((int) ELF32_R_TYPE (rela->r_info)) 1759 { 1760 case R_LM32_RELATIVE: return reloc_class_relative; 1761 case R_LM32_JMP_SLOT: return reloc_class_plt; 1762 case R_LM32_COPY: return reloc_class_copy; 1763 default: return reloc_class_normal; 1764 } 1765 } 1766 1767 /* Adjust a symbol defined by a dynamic object and referenced by a 1768 regular object. The current definition is in some section of the 1769 dynamic object, but we're not including those sections. We have to 1770 change the definition to something the rest of the link can 1771 understand. */ 1772 1773 static bfd_boolean 1774 lm32_elf_adjust_dynamic_symbol (struct bfd_link_info *info, 1775 struct elf_link_hash_entry *h) 1776 { 1777 struct elf_lm32_link_hash_table *htab; 1778 struct elf_lm32_link_hash_entry *eh; 1779 struct elf_lm32_dyn_relocs *p; 1780 bfd *dynobj; 1781 asection *s; 1782 1783 dynobj = elf_hash_table (info)->dynobj; 1784 1785 /* Make sure we know what is going on here. */ 1786 BFD_ASSERT (dynobj != NULL 1787 && (h->needs_plt 1788 || h->u.weakdef != NULL 1789 || (h->def_dynamic 1790 && h->ref_regular 1791 && !h->def_regular))); 1792 1793 /* If this is a function, put it in the procedure linkage table. We 1794 will fill in the contents of the procedure linkage table later, 1795 when we know the address of the .got section. */ 1796 if (h->type == STT_FUNC 1797 || h->needs_plt) 1798 { 1799 if (! info->shared 1800 && !h->def_dynamic 1801 && !h->ref_dynamic 1802 && h->root.type != bfd_link_hash_undefweak 1803 && h->root.type != bfd_link_hash_undefined) 1804 { 1805 /* This case can occur if we saw a PLT reloc in an input 1806 file, but the symbol was never referred to by a dynamic 1807 object. In such a case, we don't actually need to build 1808 a procedure linkage table, and we can just do a PCREL 1809 reloc instead. */ 1810 h->plt.offset = (bfd_vma) -1; 1811 h->needs_plt = 0; 1812 } 1813 1814 return TRUE; 1815 } 1816 else 1817 h->plt.offset = (bfd_vma) -1; 1818 1819 /* If this is a weak symbol, and there is a real definition, the 1820 processor independent code will have arranged for us to see the 1821 real definition first, and we can just use the same value. */ 1822 if (h->u.weakdef != NULL) 1823 { 1824 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1825 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1826 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1827 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1828 return TRUE; 1829 } 1830 1831 /* This is a reference to a symbol defined by a dynamic object which 1832 is not a function. */ 1833 1834 /* If we are creating a shared library, we must presume that the 1835 only references to the symbol are via the global offset table. 1836 For such cases we need not do anything here; the relocations will 1837 be handled correctly by relocate_section. */ 1838 if (info->shared) 1839 return TRUE; 1840 1841 /* If there are no references to this symbol that do not use the 1842 GOT, we don't need to generate a copy reloc. */ 1843 if (!h->non_got_ref) 1844 return TRUE; 1845 1846 /* If -z nocopyreloc was given, we won't generate them either. */ 1847 if (info->nocopyreloc) 1848 { 1849 h->non_got_ref = 0; 1850 return TRUE; 1851 } 1852 1853 eh = (struct elf_lm32_link_hash_entry *) h; 1854 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1855 { 1856 s = p->sec->output_section; 1857 if (s != NULL && (s->flags & (SEC_READONLY | SEC_HAS_CONTENTS)) != 0) 1858 break; 1859 } 1860 1861 /* If we didn't find any dynamic relocs in sections which needs the 1862 copy reloc, then we'll be keeping the dynamic relocs and avoiding 1863 the copy reloc. */ 1864 if (p == NULL) 1865 { 1866 h->non_got_ref = 0; 1867 return TRUE; 1868 } 1869 1870 /* We must allocate the symbol in our .dynbss section, which will 1871 become part of the .bss section of the executable. There will be 1872 an entry for this symbol in the .dynsym section. The dynamic 1873 object will contain position independent code, so all references 1874 from the dynamic object to this symbol will go through the global 1875 offset table. The dynamic linker will use the .dynsym entry to 1876 determine the address it must put in the global offset table, so 1877 both the dynamic object and the regular object will refer to the 1878 same memory location for the variable. */ 1879 1880 htab = lm32_elf_hash_table (info); 1881 if (htab == NULL) 1882 return FALSE; 1883 1884 s = htab->sdynbss; 1885 BFD_ASSERT (s != NULL); 1886 1887 /* We must generate a R_LM32_COPY reloc to tell the dynamic linker 1888 to copy the initial value out of the dynamic object and into the 1889 runtime process image. We need to remember the offset into the 1890 .rela.bss section we are going to use. */ 1891 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 1892 { 1893 asection *srel; 1894 1895 srel = htab->srelbss; 1896 BFD_ASSERT (srel != NULL); 1897 srel->size += sizeof (Elf32_External_Rela); 1898 h->needs_copy = 1; 1899 } 1900 1901 return _bfd_elf_adjust_dynamic_copy (h, s); 1902 } 1903 1904 /* Allocate space in .plt, .got and associated reloc sections for 1905 dynamic relocs. */ 1906 1907 static bfd_boolean 1908 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) 1909 { 1910 struct bfd_link_info *info; 1911 struct elf_lm32_link_hash_table *htab; 1912 struct elf_lm32_link_hash_entry *eh; 1913 struct elf_lm32_dyn_relocs *p; 1914 1915 if (h->root.type == bfd_link_hash_indirect) 1916 return TRUE; 1917 1918 info = (struct bfd_link_info *) inf; 1919 htab = lm32_elf_hash_table (info); 1920 if (htab == NULL) 1921 return FALSE; 1922 1923 eh = (struct elf_lm32_link_hash_entry *) h; 1924 1925 if (htab->root.dynamic_sections_created 1926 && h->plt.refcount > 0) 1927 { 1928 /* Make sure this symbol is output as a dynamic symbol. 1929 Undefined weak syms won't yet be marked as dynamic. */ 1930 if (h->dynindx == -1 1931 && !h->forced_local) 1932 { 1933 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1934 return FALSE; 1935 } 1936 1937 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info->shared, h)) 1938 { 1939 asection *s = htab->splt; 1940 1941 /* If this is the first .plt entry, make room for the special 1942 first entry. */ 1943 if (s->size == 0) 1944 s->size += PLT_ENTRY_SIZE; 1945 1946 h->plt.offset = s->size; 1947 1948 /* If this symbol is not defined in a regular file, and we are 1949 not generating a shared library, then set the symbol to this 1950 location in the .plt. This is required to make function 1951 pointers compare as equal between the normal executable and 1952 the shared library. */ 1953 if (! info->shared 1954 && !h->def_regular) 1955 { 1956 h->root.u.def.section = s; 1957 h->root.u.def.value = h->plt.offset; 1958 } 1959 1960 /* Make room for this entry. */ 1961 s->size += PLT_ENTRY_SIZE; 1962 1963 /* We also need to make an entry in the .got.plt section, which 1964 will be placed in the .got section by the linker script. */ 1965 htab->sgotplt->size += 4; 1966 1967 /* We also need to make an entry in the .rel.plt section. */ 1968 htab->srelplt->size += sizeof (Elf32_External_Rela); 1969 } 1970 else 1971 { 1972 h->plt.offset = (bfd_vma) -1; 1973 h->needs_plt = 0; 1974 } 1975 } 1976 else 1977 { 1978 h->plt.offset = (bfd_vma) -1; 1979 h->needs_plt = 0; 1980 } 1981 1982 if (h->got.refcount > 0) 1983 { 1984 asection *s; 1985 bfd_boolean dyn; 1986 1987 /* Make sure this symbol is output as a dynamic symbol. 1988 Undefined weak syms won't yet be marked as dynamic. */ 1989 if (h->dynindx == -1 1990 && !h->forced_local) 1991 { 1992 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1993 return FALSE; 1994 } 1995 1996 s = htab->sgot; 1997 1998 h->got.offset = s->size; 1999 s->size += 4; 2000 dyn = htab->root.dynamic_sections_created; 2001 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)) 2002 htab->srelgot->size += sizeof (Elf32_External_Rela); 2003 } 2004 else 2005 h->got.offset = (bfd_vma) -1; 2006 2007 if (eh->dyn_relocs == NULL) 2008 return TRUE; 2009 2010 /* In the shared -Bsymbolic case, discard space allocated for 2011 dynamic pc-relative relocs against symbols which turn out to be 2012 defined in regular objects. For the normal shared case, discard 2013 space for pc-relative relocs that have become local due to symbol 2014 visibility changes. */ 2015 2016 if (info->shared) 2017 { 2018 if (h->def_regular 2019 && (h->forced_local 2020 || info->symbolic)) 2021 { 2022 struct elf_lm32_dyn_relocs **pp; 2023 2024 for (pp = &eh->dyn_relocs; (p = *pp) != NULL;) 2025 { 2026 p->count -= p->pc_count; 2027 p->pc_count = 0; 2028 if (p->count == 0) 2029 *pp = p->next; 2030 else 2031 pp = &p->next; 2032 } 2033 } 2034 2035 /* Also discard relocs on undefined weak syms with non-default 2036 visibility. */ 2037 if (eh->dyn_relocs != NULL 2038 && h->root.type == bfd_link_hash_undefweak) 2039 { 2040 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 2041 eh->dyn_relocs = NULL; 2042 2043 /* Make sure undefined weak symbols are output as a dynamic 2044 symbol in PIEs. */ 2045 else if (h->dynindx == -1 2046 && !h->forced_local) 2047 { 2048 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2049 return FALSE; 2050 } 2051 } 2052 } 2053 else 2054 { 2055 /* For the non-shared case, discard space for relocs against 2056 symbols which turn out to need copy relocs or are not 2057 dynamic. */ 2058 2059 if (!h->non_got_ref 2060 && ((h->def_dynamic 2061 && !h->def_regular) 2062 || (htab->root.dynamic_sections_created 2063 && (h->root.type == bfd_link_hash_undefweak 2064 || h->root.type == bfd_link_hash_undefined)))) 2065 { 2066 /* Make sure this symbol is output as a dynamic symbol. 2067 Undefined weak syms won't yet be marked as dynamic. */ 2068 if (h->dynindx == -1 2069 && !h->forced_local) 2070 { 2071 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2072 return FALSE; 2073 } 2074 2075 /* If that succeeded, we know we'll be keeping all the 2076 relocs. */ 2077 if (h->dynindx != -1) 2078 goto keep; 2079 } 2080 2081 eh->dyn_relocs = NULL; 2082 2083 keep: ; 2084 } 2085 2086 /* Finally, allocate space. */ 2087 for (p = eh->dyn_relocs; p != NULL; p = p->next) 2088 { 2089 asection *sreloc = elf_section_data (p->sec)->sreloc; 2090 sreloc->size += p->count * sizeof (Elf32_External_Rela); 2091 } 2092 2093 return TRUE; 2094 } 2095 2096 /* Find any dynamic relocs that apply to read-only sections. */ 2097 2098 static bfd_boolean 2099 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf) 2100 { 2101 struct elf_lm32_link_hash_entry *eh; 2102 struct elf_lm32_dyn_relocs *p; 2103 2104 eh = (struct elf_lm32_link_hash_entry *) h; 2105 for (p = eh->dyn_relocs; p != NULL; p = p->next) 2106 { 2107 asection *s = p->sec->output_section; 2108 2109 if (s != NULL && (s->flags & SEC_READONLY) != 0) 2110 { 2111 struct bfd_link_info *info = (struct bfd_link_info *) inf; 2112 2113 info->flags |= DF_TEXTREL; 2114 2115 /* Not an error, just cut short the traversal. */ 2116 return FALSE; 2117 } 2118 } 2119 return TRUE; 2120 } 2121 2122 /* Set the sizes of the dynamic sections. */ 2123 2124 static bfd_boolean 2125 lm32_elf_size_dynamic_sections (bfd *output_bfd, 2126 struct bfd_link_info *info) 2127 { 2128 struct elf_lm32_link_hash_table *htab; 2129 bfd *dynobj; 2130 asection *s; 2131 bfd_boolean relocs; 2132 bfd *ibfd; 2133 2134 htab = lm32_elf_hash_table (info); 2135 if (htab == NULL) 2136 return FALSE; 2137 2138 dynobj = htab->root.dynobj; 2139 BFD_ASSERT (dynobj != NULL); 2140 2141 if (htab->root.dynamic_sections_created) 2142 { 2143 /* Set the contents of the .interp section to the interpreter. */ 2144 if (info->executable) 2145 { 2146 s = bfd_get_linker_section (dynobj, ".interp"); 2147 BFD_ASSERT (s != NULL); 2148 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2149 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2150 } 2151 } 2152 2153 /* Set up .got offsets for local syms, and space for local dynamic 2154 relocs. */ 2155 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 2156 { 2157 bfd_signed_vma *local_got; 2158 bfd_signed_vma *end_local_got; 2159 bfd_size_type locsymcount; 2160 Elf_Internal_Shdr *symtab_hdr; 2161 asection *srel; 2162 2163 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 2164 continue; 2165 2166 for (s = ibfd->sections; s != NULL; s = s->next) 2167 { 2168 struct elf_lm32_dyn_relocs *p; 2169 2170 for (p = ((struct elf_lm32_dyn_relocs *) 2171 elf_section_data (s)->local_dynrel); 2172 p != NULL; 2173 p = p->next) 2174 { 2175 if (! bfd_is_abs_section (p->sec) 2176 && bfd_is_abs_section (p->sec->output_section)) 2177 { 2178 /* Input section has been discarded, either because 2179 it is a copy of a linkonce section or due to 2180 linker script /DISCARD/, so we'll be discarding 2181 the relocs too. */ 2182 } 2183 else if (p->count != 0) 2184 { 2185 srel = elf_section_data (p->sec)->sreloc; 2186 srel->size += p->count * sizeof (Elf32_External_Rela); 2187 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 2188 info->flags |= DF_TEXTREL; 2189 } 2190 } 2191 } 2192 2193 local_got = elf_local_got_refcounts (ibfd); 2194 if (!local_got) 2195 continue; 2196 2197 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 2198 locsymcount = symtab_hdr->sh_info; 2199 end_local_got = local_got + locsymcount; 2200 s = htab->sgot; 2201 srel = htab->srelgot; 2202 for (; local_got < end_local_got; ++local_got) 2203 { 2204 if (*local_got > 0) 2205 { 2206 *local_got = s->size; 2207 s->size += 4; 2208 if (info->shared) 2209 srel->size += sizeof (Elf32_External_Rela); 2210 } 2211 else 2212 *local_got = (bfd_vma) -1; 2213 } 2214 } 2215 2216 /* Allocate global sym .plt and .got entries, and space for global 2217 sym dynamic relocs. */ 2218 elf_link_hash_traverse (&htab->root, allocate_dynrelocs, info); 2219 2220 /* We now have determined the sizes of the various dynamic sections. 2221 Allocate memory for them. */ 2222 relocs = FALSE; 2223 for (s = dynobj->sections; s != NULL; s = s->next) 2224 { 2225 if ((s->flags & SEC_LINKER_CREATED) == 0) 2226 continue; 2227 2228 if (s == htab->splt 2229 || s == htab->sgot 2230 || s == htab->sgotplt 2231 || s == htab->sdynbss) 2232 { 2233 /* Strip this section if we don't need it; see the 2234 comment below. */ 2235 } 2236 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 2237 { 2238 if (s->size != 0 && s != htab->srelplt) 2239 relocs = TRUE; 2240 2241 /* We use the reloc_count field as a counter if we need 2242 to copy relocs into the output file. */ 2243 s->reloc_count = 0; 2244 } 2245 else 2246 /* It's not one of our sections, so don't allocate space. */ 2247 continue; 2248 2249 if (s->size == 0) 2250 { 2251 /* If we don't need this section, strip it from the 2252 output file. This is mostly to handle .rela.bss and 2253 .rela.plt. We must create both sections in 2254 create_dynamic_sections, because they must be created 2255 before the linker maps input sections to output 2256 sections. The linker does that before 2257 adjust_dynamic_symbol is called, and it is that 2258 function which decides whether anything needs to go 2259 into these sections. */ 2260 s->flags |= SEC_EXCLUDE; 2261 continue; 2262 } 2263 2264 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2265 continue; 2266 2267 /* Allocate memory for the section contents. We use bfd_zalloc 2268 here in case unused entries are not reclaimed before the 2269 section's contents are written out. This should not happen, 2270 but this way if it does, we get a R_LM32_NONE reloc instead 2271 of garbage. */ 2272 s->contents = bfd_zalloc (dynobj, s->size); 2273 if (s->contents == NULL) 2274 return FALSE; 2275 } 2276 2277 if (htab->root.dynamic_sections_created) 2278 { 2279 /* Add some entries to the .dynamic section. We fill in the 2280 values later, in lm32_elf_finish_dynamic_sections, but we 2281 must add the entries now so that we get the correct size for 2282 the .dynamic section. The DT_DEBUG entry is filled in by the 2283 dynamic linker and used by the debugger. */ 2284 #define add_dynamic_entry(TAG, VAL) \ 2285 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2286 2287 if (info->executable) 2288 { 2289 if (! add_dynamic_entry (DT_DEBUG, 0)) 2290 return FALSE; 2291 } 2292 2293 if (htab->splt->size != 0) 2294 { 2295 if (! add_dynamic_entry (DT_PLTGOT, 0) 2296 || ! add_dynamic_entry (DT_PLTRELSZ, 0) 2297 || ! add_dynamic_entry (DT_PLTREL, DT_RELA) 2298 || ! add_dynamic_entry (DT_JMPREL, 0)) 2299 return FALSE; 2300 } 2301 2302 if (relocs) 2303 { 2304 if (! add_dynamic_entry (DT_RELA, 0) 2305 || ! add_dynamic_entry (DT_RELASZ, 0) 2306 || ! add_dynamic_entry (DT_RELAENT, 2307 sizeof (Elf32_External_Rela))) 2308 return FALSE; 2309 2310 /* If any dynamic relocs apply to a read-only section, 2311 then we need a DT_TEXTREL entry. */ 2312 if ((info->flags & DF_TEXTREL) == 0) 2313 elf_link_hash_traverse (&htab->root, readonly_dynrelocs, 2314 info); 2315 2316 if ((info->flags & DF_TEXTREL) != 0) 2317 { 2318 if (! add_dynamic_entry (DT_TEXTREL, 0)) 2319 return FALSE; 2320 } 2321 } 2322 } 2323 #undef add_dynamic_entry 2324 2325 /* Allocate .rofixup section. */ 2326 if (IS_FDPIC (output_bfd)) 2327 { 2328 struct weak_symbol_list *list_start = NULL, *list_end = NULL; 2329 int rgot_weak_count = 0; 2330 int r32_count = 0; 2331 int rgot_count = 0; 2332 /* Look for deleted sections. */ 2333 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 2334 { 2335 for (s = ibfd->sections; s != NULL; s = s->next) 2336 { 2337 if (s->reloc_count) 2338 { 2339 /* Count relocs that need .rofixup entires. */ 2340 Elf_Internal_Rela *internal_relocs, *end; 2341 internal_relocs = elf_section_data (s)->relocs; 2342 if (internal_relocs == NULL) 2343 internal_relocs = (_bfd_elf_link_read_relocs (ibfd, s, NULL, NULL, FALSE)); 2344 if (internal_relocs != NULL) 2345 { 2346 end = internal_relocs + s->reloc_count; 2347 while (internal_relocs < end) 2348 { 2349 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 2350 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd); 2351 unsigned long r_symndx; 2352 struct elf_link_hash_entry *h; 2353 2354 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 2355 sym_hashes = elf_sym_hashes (ibfd); 2356 r_symndx = ELF32_R_SYM (internal_relocs->r_info); 2357 h = NULL; 2358 if (r_symndx < symtab_hdr->sh_info) 2359 { 2360 } 2361 else 2362 { 2363 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2364 while (h->root.type == bfd_link_hash_indirect 2365 || h->root.type == bfd_link_hash_warning) 2366 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2367 } 2368 2369 /* Don't generate entries for weak symbols. */ 2370 if (!h || (h && h->root.type != bfd_link_hash_undefweak)) 2371 { 2372 if (!discarded_section (s) && !((bfd_get_section_flags (ibfd, s) & SEC_ALLOC) == 0)) 2373 { 2374 switch (ELF32_R_TYPE (internal_relocs->r_info)) 2375 { 2376 case R_LM32_32: 2377 r32_count++; 2378 break; 2379 case R_LM32_16_GOT: 2380 rgot_count++; 2381 break; 2382 } 2383 } 2384 } 2385 else 2386 { 2387 struct weak_symbol_list *current, *new_entry; 2388 /* Is this symbol already in the list? */ 2389 for (current = list_start; current; current = current->next) 2390 { 2391 if (!strcmp (current->name, h->root.root.string)) 2392 break; 2393 } 2394 if (!current && !discarded_section (s) && (bfd_get_section_flags (ibfd, s) & SEC_ALLOC)) 2395 { 2396 /* Will this have an entry in the GOT. */ 2397 if (ELF32_R_TYPE (internal_relocs->r_info) == R_LM32_16_GOT) 2398 { 2399 /* Create a new entry. */ 2400 new_entry = malloc (sizeof (struct weak_symbol_list)); 2401 if (!new_entry) 2402 return FALSE; 2403 new_entry->name = h->root.root.string; 2404 new_entry->next = NULL; 2405 /* Add to list */ 2406 if (list_start == NULL) 2407 { 2408 list_start = new_entry; 2409 list_end = new_entry; 2410 } 2411 else 2412 { 2413 list_end->next = new_entry; 2414 list_end = new_entry; 2415 } 2416 /* Increase count of undefined weak symbols in the got. */ 2417 rgot_weak_count++; 2418 } 2419 } 2420 } 2421 internal_relocs++; 2422 } 2423 } 2424 else 2425 return FALSE; 2426 } 2427 } 2428 } 2429 /* Free list. */ 2430 while (list_start) 2431 { 2432 list_end = list_start->next; 2433 free (list_start); 2434 list_start = list_end; 2435 } 2436 2437 /* Size sections. */ 2438 lm32fdpic_fixup32_section (info)->size = (r32_count + (htab->sgot->size / 4) - rgot_weak_count + 1) * 4; 2439 if (lm32fdpic_fixup32_section (info)->size == 0) 2440 lm32fdpic_fixup32_section (info)->flags |= SEC_EXCLUDE; 2441 else 2442 { 2443 lm32fdpic_fixup32_section (info)->contents = 2444 bfd_zalloc (dynobj, lm32fdpic_fixup32_section (info)->size); 2445 if (lm32fdpic_fixup32_section (info)->contents == NULL) 2446 return FALSE; 2447 } 2448 } 2449 2450 return TRUE; 2451 } 2452 2453 /* Create dynamic sections when linking against a dynamic object. */ 2454 2455 static bfd_boolean 2456 lm32_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) 2457 { 2458 struct elf_lm32_link_hash_table *htab; 2459 flagword flags, pltflags; 2460 asection *s; 2461 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 2462 int ptralign = 2; /* 32bit */ 2463 2464 htab = lm32_elf_hash_table (info); 2465 if (htab == NULL) 2466 return FALSE; 2467 2468 /* Make sure we have a GOT - For the case where we have a dynamic object 2469 but none of the relocs in check_relocs */ 2470 if (! create_got_section (abfd, info)) 2471 return FALSE; 2472 if (IS_FDPIC (abfd) && (htab->sfixup32 == NULL)) 2473 { 2474 if (! create_rofixup_section (abfd, info)) 2475 return FALSE; 2476 } 2477 2478 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and 2479 .rel[a].bss sections. */ 2480 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 2481 | SEC_LINKER_CREATED); 2482 2483 pltflags = flags; 2484 pltflags |= SEC_CODE; 2485 if (bed->plt_not_loaded) 2486 pltflags &= ~ (SEC_LOAD | SEC_HAS_CONTENTS); 2487 if (bed->plt_readonly) 2488 pltflags |= SEC_READONLY; 2489 2490 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags); 2491 htab->splt = s; 2492 if (s == NULL 2493 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) 2494 return FALSE; 2495 2496 if (bed->want_plt_sym) 2497 { 2498 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the 2499 .plt section. */ 2500 struct bfd_link_hash_entry *bh = NULL; 2501 struct elf_link_hash_entry *h; 2502 2503 if (! (_bfd_generic_link_add_one_symbol 2504 (info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, 2505 (bfd_vma) 0, NULL, FALSE, 2506 get_elf_backend_data (abfd)->collect, &bh))) 2507 return FALSE; 2508 h = (struct elf_link_hash_entry *) bh; 2509 h->def_regular = 1; 2510 h->type = STT_OBJECT; 2511 htab->root.hplt = h; 2512 2513 if (info->shared 2514 && ! bfd_elf_link_record_dynamic_symbol (info, h)) 2515 return FALSE; 2516 } 2517 2518 s = bfd_make_section_anyway_with_flags (abfd, 2519 bed->default_use_rela_p 2520 ? ".rela.plt" : ".rel.plt", 2521 flags | SEC_READONLY); 2522 htab->srelplt = s; 2523 if (s == NULL 2524 || ! bfd_set_section_alignment (abfd, s, ptralign)) 2525 return FALSE; 2526 2527 if (htab->sgot == NULL 2528 && ! create_got_section (abfd, info)) 2529 return FALSE; 2530 2531 if (bed->want_dynbss) 2532 { 2533 /* The .dynbss section is a place to put symbols which are defined 2534 by dynamic objects, are referenced by regular objects, and are 2535 not functions. We must allocate space for them in the process 2536 image and use a R_*_COPY reloc to tell the dynamic linker to 2537 initialize them at run time. The linker script puts the .dynbss 2538 section into the .bss section of the final image. */ 2539 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss", 2540 SEC_ALLOC | SEC_LINKER_CREATED); 2541 htab->sdynbss = s; 2542 if (s == NULL) 2543 return FALSE; 2544 /* The .rel[a].bss section holds copy relocs. This section is not 2545 normally needed. We need to create it here, though, so that the 2546 linker will map it to an output section. We can't just create it 2547 only if we need it, because we will not know whether we need it 2548 until we have seen all the input files, and the first time the 2549 main linker code calls BFD after examining all the input files 2550 (size_dynamic_sections) the input sections have already been 2551 mapped to the output sections. If the section turns out not to 2552 be needed, we can discard it later. We will never need this 2553 section when generating a shared object, since they do not use 2554 copy relocs. */ 2555 if (! info->shared) 2556 { 2557 s = bfd_make_section_anyway_with_flags (abfd, 2558 (bed->default_use_rela_p 2559 ? ".rela.bss" : ".rel.bss"), 2560 flags | SEC_READONLY); 2561 htab->srelbss = s; 2562 if (s == NULL 2563 || ! bfd_set_section_alignment (abfd, s, ptralign)) 2564 return FALSE; 2565 } 2566 } 2567 2568 return TRUE; 2569 } 2570 2571 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 2572 2573 static void 2574 lm32_elf_copy_indirect_symbol (struct bfd_link_info *info, 2575 struct elf_link_hash_entry *dir, 2576 struct elf_link_hash_entry *ind) 2577 { 2578 struct elf_lm32_link_hash_entry * edir; 2579 struct elf_lm32_link_hash_entry * eind; 2580 2581 edir = (struct elf_lm32_link_hash_entry *) dir; 2582 eind = (struct elf_lm32_link_hash_entry *) ind; 2583 2584 if (eind->dyn_relocs != NULL) 2585 { 2586 if (edir->dyn_relocs != NULL) 2587 { 2588 struct elf_lm32_dyn_relocs **pp; 2589 struct elf_lm32_dyn_relocs *p; 2590 2591 /* Add reloc counts against the indirect sym to the direct sym 2592 list. Merge any entries against the same section. */ 2593 for (pp = &eind->dyn_relocs; (p = *pp) != NULL;) 2594 { 2595 struct elf_lm32_dyn_relocs *q; 2596 2597 for (q = edir->dyn_relocs; q != NULL; q = q->next) 2598 if (q->sec == p->sec) 2599 { 2600 q->pc_count += p->pc_count; 2601 q->count += p->count; 2602 *pp = p->next; 2603 break; 2604 } 2605 if (q == NULL) 2606 pp = &p->next; 2607 } 2608 *pp = edir->dyn_relocs; 2609 } 2610 2611 edir->dyn_relocs = eind->dyn_relocs; 2612 eind->dyn_relocs = NULL; 2613 } 2614 2615 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 2616 } 2617 2618 static bfd_boolean 2619 lm32_elf_always_size_sections (bfd *output_bfd, 2620 struct bfd_link_info *info) 2621 { 2622 if (!info->relocatable) 2623 { 2624 struct elf_link_hash_entry *h; 2625 2626 /* Force a PT_GNU_STACK segment to be created. */ 2627 if (! elf_tdata (output_bfd)->stack_flags) 2628 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X; 2629 2630 /* Define __stacksize if it's not defined yet. */ 2631 h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize", 2632 FALSE, FALSE, FALSE); 2633 if (! h || h->root.type != bfd_link_hash_defined 2634 || h->type != STT_OBJECT 2635 || !h->def_regular) 2636 { 2637 struct bfd_link_hash_entry *bh = NULL; 2638 2639 if (!(_bfd_generic_link_add_one_symbol 2640 (info, output_bfd, "__stacksize", 2641 BSF_GLOBAL, bfd_abs_section_ptr, DEFAULT_STACK_SIZE, 2642 (const char *) NULL, FALSE, 2643 get_elf_backend_data (output_bfd)->collect, &bh))) 2644 return FALSE; 2645 2646 h = (struct elf_link_hash_entry *) bh; 2647 h->def_regular = 1; 2648 h->type = STT_OBJECT; 2649 /* This one must NOT be hidden. */ 2650 } 2651 } 2652 2653 return TRUE; 2654 } 2655 2656 static bfd_boolean 2657 lm32_elf_modify_segment_map (bfd *output_bfd, 2658 struct bfd_link_info *info) 2659 { 2660 struct elf_segment_map *m; 2661 2662 /* objcopy and strip preserve what's already there using elf32_lm32fdpic_copy_ 2663 private_bfd_data (). */ 2664 if (! info) 2665 return TRUE; 2666 2667 for (m = elf_tdata (output_bfd)->segment_map; m != NULL; m = m->next) 2668 if (m->p_type == PT_GNU_STACK) 2669 break; 2670 2671 if (m) 2672 { 2673 asection *sec = bfd_get_section_by_name (output_bfd, ".stack"); 2674 struct elf_link_hash_entry *h; 2675 2676 if (sec) 2677 { 2678 /* Obtain the pointer to the __stacksize symbol. */ 2679 h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize", 2680 FALSE, FALSE, FALSE); 2681 while (h->root.type == bfd_link_hash_indirect 2682 || h->root.type == bfd_link_hash_warning) 2683 h = (struct elf_link_hash_entry *)h->root.u.i.link; 2684 BFD_ASSERT (h->root.type == bfd_link_hash_defined); 2685 2686 /* Set the section size from the symbol value. We 2687 intentionally ignore the symbol section. */ 2688 if (h->root.type == bfd_link_hash_defined) 2689 sec->size = h->root.u.def.value; 2690 else 2691 sec->size = DEFAULT_STACK_SIZE; 2692 2693 /* Add the stack section to the PT_GNU_STACK segment, 2694 such that its size and alignment requirements make it 2695 to the segment. */ 2696 m->sections[m->count] = sec; 2697 m->count++; 2698 } 2699 } 2700 2701 return TRUE; 2702 } 2703 2704 static bfd_boolean 2705 lm32_elf_modify_program_headers (bfd *output_bfd, 2706 struct bfd_link_info *info) 2707 { 2708 struct elf_obj_tdata *tdata = elf_tdata (output_bfd); 2709 struct elf_segment_map *m; 2710 Elf_Internal_Phdr *p; 2711 2712 if (! info) 2713 return TRUE; 2714 2715 for (p = tdata->phdr, m = tdata->segment_map; m != NULL; m = m->next, p++) 2716 if (m->p_type == PT_GNU_STACK) 2717 break; 2718 2719 if (m) 2720 { 2721 struct elf_link_hash_entry *h; 2722 2723 /* Obtain the pointer to the __stacksize symbol. */ 2724 h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize", 2725 FALSE, FALSE, FALSE); 2726 if (h) 2727 { 2728 while (h->root.type == bfd_link_hash_indirect 2729 || h->root.type == bfd_link_hash_warning) 2730 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2731 BFD_ASSERT (h->root.type == bfd_link_hash_defined); 2732 } 2733 2734 /* Set the header p_memsz from the symbol value. We 2735 intentionally ignore the symbol section. */ 2736 if (h && h->root.type == bfd_link_hash_defined) 2737 p->p_memsz = h->root.u.def.value; 2738 else 2739 p->p_memsz = DEFAULT_STACK_SIZE; 2740 2741 p->p_align = 8; 2742 } 2743 2744 return TRUE; 2745 } 2746 2747 2748 static bfd_boolean 2749 lm32_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 2750 { 2751 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 2752 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 2753 return TRUE; 2754 2755 BFD_ASSERT (!elf_flags_init (obfd) 2756 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags); 2757 2758 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; 2759 elf_flags_init (obfd) = TRUE; 2760 2761 /* Copy object attributes. */ 2762 _bfd_elf_copy_obj_attributes (ibfd, obfd); 2763 2764 return TRUE; 2765 } 2766 2767 2768 static bfd_boolean 2769 lm32_elf_fdpic_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 2770 { 2771 unsigned i; 2772 2773 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 2774 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 2775 return TRUE; 2776 2777 if (! lm32_elf_copy_private_bfd_data (ibfd, obfd)) 2778 return FALSE; 2779 2780 if (! elf_tdata (ibfd) || ! elf_tdata (ibfd)->phdr 2781 || ! elf_tdata (obfd) || ! elf_tdata (obfd)->phdr) 2782 return TRUE; 2783 2784 /* Copy the stack size. */ 2785 for (i = 0; i < elf_elfheader (ibfd)->e_phnum; i++) 2786 if (elf_tdata (ibfd)->phdr[i].p_type == PT_GNU_STACK) 2787 { 2788 Elf_Internal_Phdr *iphdr = &elf_tdata (ibfd)->phdr[i]; 2789 2790 for (i = 0; i < elf_elfheader (obfd)->e_phnum; i++) 2791 if (elf_tdata (obfd)->phdr[i].p_type == PT_GNU_STACK) 2792 { 2793 memcpy (&elf_tdata (obfd)->phdr[i], iphdr, sizeof (*iphdr)); 2794 2795 /* Rewrite the phdrs, since we're only called after they were first written. */ 2796 if (bfd_seek (obfd, (bfd_signed_vma) get_elf_backend_data (obfd) 2797 ->s->sizeof_ehdr, SEEK_SET) != 0 2798 || get_elf_backend_data (obfd)->s->write_out_phdrs (obfd, elf_tdata (obfd)->phdr, 2799 elf_elfheader (obfd)->e_phnum) != 0) 2800 return FALSE; 2801 break; 2802 } 2803 2804 break; 2805 } 2806 2807 return TRUE; 2808 } 2809 2810 2811 #define ELF_ARCH bfd_arch_lm32 2812 #define ELF_TARGET_ID LM32_ELF_DATA 2813 #define ELF_MACHINE_CODE EM_LATTICEMICO32 2814 #define ELF_MAXPAGESIZE 0x1000 2815 2816 #define TARGET_BIG_SYM bfd_elf32_lm32_vec 2817 #define TARGET_BIG_NAME "elf32-lm32" 2818 2819 #define bfd_elf32_bfd_reloc_type_lookup lm32_reloc_type_lookup 2820 #define bfd_elf32_bfd_reloc_name_lookup lm32_reloc_name_lookup 2821 #define elf_info_to_howto lm32_info_to_howto_rela 2822 #define elf_info_to_howto_rel 0 2823 #define elf_backend_rela_normal 1 2824 #define elf_backend_object_p lm32_elf_object_p 2825 #define elf_backend_final_write_processing lm32_elf_final_write_processing 2826 #define elf_backend_can_gc_sections 1 2827 #define elf_backend_can_refcount 1 2828 #define elf_backend_gc_mark_hook lm32_elf_gc_mark_hook 2829 #define elf_backend_gc_sweep_hook lm32_elf_gc_sweep_hook 2830 #define elf_backend_plt_readonly 1 2831 #define elf_backend_want_got_plt 1 2832 #define elf_backend_want_plt_sym 0 2833 #define elf_backend_got_header_size 12 2834 #define bfd_elf32_bfd_link_hash_table_create lm32_elf_link_hash_table_create 2835 #define elf_backend_check_relocs lm32_elf_check_relocs 2836 #define elf_backend_reloc_type_class lm32_elf_reloc_type_class 2837 #define elf_backend_copy_indirect_symbol lm32_elf_copy_indirect_symbol 2838 #define elf_backend_size_dynamic_sections lm32_elf_size_dynamic_sections 2839 #define elf_backend_omit_section_dynsym ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 2840 #define elf_backend_create_dynamic_sections lm32_elf_create_dynamic_sections 2841 #define elf_backend_finish_dynamic_sections lm32_elf_finish_dynamic_sections 2842 #define elf_backend_adjust_dynamic_symbol lm32_elf_adjust_dynamic_symbol 2843 #define elf_backend_finish_dynamic_symbol lm32_elf_finish_dynamic_symbol 2844 #define elf_backend_relocate_section lm32_elf_relocate_section 2845 2846 #include "elf32-target.h" 2847 2848 #undef ELF_MAXPAGESIZE 2849 #define ELF_MAXPAGESIZE 0x4000 2850 2851 2852 #undef TARGET_BIG_SYM 2853 #define TARGET_BIG_SYM bfd_elf32_lm32fdpic_vec 2854 #undef TARGET_BIG_NAME 2855 #define TARGET_BIG_NAME "elf32-lm32fdpic" 2856 #undef elf32_bed 2857 #define elf32_bed elf32_lm32fdpic_bed 2858 2859 #undef elf_backend_always_size_sections 2860 #define elf_backend_always_size_sections lm32_elf_always_size_sections 2861 #undef elf_backend_modify_segment_map 2862 #define elf_backend_modify_segment_map lm32_elf_modify_segment_map 2863 #undef elf_backend_modify_program_headers 2864 #define elf_backend_modify_program_headers lm32_elf_modify_program_headers 2865 #undef bfd_elf32_bfd_copy_private_bfd_data 2866 #define bfd_elf32_bfd_copy_private_bfd_data lm32_elf_fdpic_copy_private_bfd_data 2867 2868 #include "elf32-target.h" 2869