1/* CRIS-specific support for 32-bit ELF. 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 3 Free Software Foundation, Inc. 4 Contributed by Axis Communications AB. 5 Written by Hans-Peter Nilsson, based on elf32-fr30.c 6 PIC and shlib bits based primarily on elf32-m68k.c and elf32-i386.c. 7 8 This file is part of BFD, the Binary File Descriptor library. 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 3 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with this program; if not, write to the Free Software 22 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 23 MA 02110-1301, USA. */ 24 25#include "sysdep.h" 26#include "bfd.h" 27#include "libbfd.h" 28#include "elf-bfd.h" 29#include "elf/cris.h" 30 31/* Forward declarations. */ 32static reloc_howto_type * cris_reloc_type_lookup 33 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); 34 35static void cris_info_to_howto_rela 36 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 37 38static bfd_reloc_status_type cris_elf_pcrel_reloc 39 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 40 41static bfd_boolean cris_elf_grok_prstatus 42 PARAMS ((bfd *abfd, Elf_Internal_Note *note)); 43 44static bfd_boolean cris_elf_grok_psinfo 45 PARAMS ((bfd *abfd, Elf_Internal_Note *note)); 46 47static bfd_boolean cris_elf_relocate_section 48 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 49 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 50 51static bfd_reloc_status_type cris_final_link_relocate 52 PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, 53 Elf_Internal_Rela *, bfd_vma)); 54 55static bfd_boolean cris_elf_object_p PARAMS ((bfd *)); 56 57static void cris_elf_final_write_processing PARAMS ((bfd *, bfd_boolean)); 58 59static bfd_boolean cris_elf_set_mach_from_flags 60 PARAMS ((bfd *, unsigned long int)); 61 62static bfd_boolean cris_elf_print_private_bfd_data PARAMS ((bfd *, PTR)); 63 64static bfd_boolean cris_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *)); 65static bfd_boolean cris_elf_copy_private_bfd_data PARAMS ((bfd *, bfd *)); 66 67struct elf_cris_link_hash_entry; 68static bfd_boolean elf_cris_discard_excess_dso_dynamics 69 PARAMS ((struct elf_cris_link_hash_entry *, PTR)); 70static bfd_boolean elf_cris_discard_excess_program_dynamics 71 PARAMS ((struct elf_cris_link_hash_entry *, PTR)); 72static bfd_boolean elf_cris_adjust_gotplt_to_got 73 PARAMS ((struct elf_cris_link_hash_entry *, PTR)); 74static bfd_boolean elf_cris_try_fold_plt_to_got 75 PARAMS ((struct elf_cris_link_hash_entry *, PTR)); 76static struct bfd_hash_entry *elf_cris_link_hash_newfunc 77 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); 78static struct bfd_link_hash_table *elf_cris_link_hash_table_create 79 PARAMS ((bfd *)); 80static bfd_boolean elf_cris_adjust_dynamic_symbol 81 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); 82static bfd_boolean cris_elf_check_relocs 83 PARAMS ((bfd *, struct bfd_link_info *, asection *, 84 const Elf_Internal_Rela *)); 85 86static bfd_boolean elf_cris_size_dynamic_sections 87 PARAMS ((bfd *, struct bfd_link_info *)); 88static bfd_boolean elf_cris_finish_dynamic_symbol 89 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, 90 Elf_Internal_Sym *)); 91static bfd_boolean elf_cris_finish_dynamic_sections 92 PARAMS ((bfd *, struct bfd_link_info *)); 93static void elf_cris_hide_symbol 94 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean)); 95static enum elf_reloc_type_class elf_cris_reloc_type_class 96 PARAMS ((const Elf_Internal_Rela *)); 97 98static reloc_howto_type cris_elf_howto_table [] = 99{ 100 /* This reloc does nothing. */ 101 HOWTO (R_CRIS_NONE, /* type */ 102 0, /* rightshift */ 103 2, /* size (0 = byte, 1 = short, 2 = long) */ 104 32, /* bitsize */ 105 FALSE, /* pc_relative */ 106 0, /* bitpos */ 107 complain_overflow_bitfield, /* complain_on_overflow */ 108 bfd_elf_generic_reloc, /* special_function */ 109 "R_CRIS_NONE", /* name */ 110 FALSE, /* partial_inplace */ 111 0, /* src_mask */ 112 0, /* dst_mask */ 113 FALSE), /* pcrel_offset */ 114 115 /* An 8 bit absolute relocation. */ 116 HOWTO (R_CRIS_8, /* type */ 117 0, /* rightshift */ 118 0, /* size (0 = byte, 1 = short, 2 = long) */ 119 8, /* bitsize */ 120 FALSE, /* pc_relative */ 121 0, /* bitpos */ 122 complain_overflow_bitfield, /* complain_on_overflow */ 123 bfd_elf_generic_reloc, /* special_function */ 124 "R_CRIS_8", /* name */ 125 FALSE, /* partial_inplace */ 126 0x0000, /* src_mask */ 127 0x00ff, /* dst_mask */ 128 FALSE), /* pcrel_offset */ 129 130 /* A 16 bit absolute relocation. */ 131 HOWTO (R_CRIS_16, /* type */ 132 0, /* rightshift */ 133 1, /* size (0 = byte, 1 = short, 2 = long) */ 134 16, /* bitsize */ 135 FALSE, /* pc_relative */ 136 0, /* bitpos */ 137 complain_overflow_bitfield, /* complain_on_overflow */ 138 bfd_elf_generic_reloc, /* special_function */ 139 "R_CRIS_16", /* name */ 140 FALSE, /* partial_inplace */ 141 0x00000000, /* src_mask */ 142 0x0000ffff, /* dst_mask */ 143 FALSE), /* pcrel_offset */ 144 145 /* A 32 bit absolute relocation. */ 146 HOWTO (R_CRIS_32, /* type */ 147 0, /* rightshift */ 148 2, /* size (0 = byte, 1 = short, 2 = long) */ 149 32, /* bitsize */ 150 FALSE, /* pc_relative */ 151 0, /* bitpos */ 152 /* We don't want overflow complaints for 64-bit vma builds 153 for e.g. sym+0x40000000 (or actually sym-0xc0000000 in 154 32-bit ELF) where sym=0xc0001234. 155 Don't do this for the PIC relocs, as we don't expect to 156 see them with large offsets. */ 157 complain_overflow_dont, /* complain_on_overflow */ 158 bfd_elf_generic_reloc, /* special_function */ 159 "R_CRIS_32", /* name */ 160 FALSE, /* partial_inplace */ 161 0x00000000, /* src_mask */ 162 0xffffffff, /* dst_mask */ 163 FALSE), /* pcrel_offset */ 164 165 /* An 8 bit PC-relative relocation. */ 166 HOWTO (R_CRIS_8_PCREL, /* type */ 167 0, /* rightshift */ 168 0, /* size (0 = byte, 1 = short, 2 = long) */ 169 8, /* bitsize */ 170 TRUE, /* pc_relative */ 171 0, /* bitpos */ 172 complain_overflow_bitfield, /* complain_on_overflow */ 173 cris_elf_pcrel_reloc, /* special_function */ 174 "R_CRIS_8_PCREL", /* name */ 175 FALSE, /* partial_inplace */ 176 0x0000, /* src_mask */ 177 0x00ff, /* dst_mask */ 178 TRUE), /* pcrel_offset */ 179 180 /* A 16 bit PC-relative relocation. */ 181 HOWTO (R_CRIS_16_PCREL, /* type */ 182 0, /* rightshift */ 183 1, /* size (0 = byte, 1 = short, 2 = long) */ 184 16, /* bitsize */ 185 TRUE, /* pc_relative */ 186 0, /* bitpos */ 187 complain_overflow_bitfield, /* complain_on_overflow */ 188 cris_elf_pcrel_reloc, /* special_function */ 189 "R_CRIS_16_PCREL", /* name */ 190 FALSE, /* partial_inplace */ 191 0x00000000, /* src_mask */ 192 0x0000ffff, /* dst_mask */ 193 TRUE), /* pcrel_offset */ 194 195 /* A 32 bit PC-relative relocation. */ 196 HOWTO (R_CRIS_32_PCREL, /* type */ 197 0, /* rightshift */ 198 2, /* size (0 = byte, 1 = short, 2 = long) */ 199 32, /* bitsize */ 200 TRUE, /* pc_relative */ 201 0, /* bitpos */ 202 complain_overflow_bitfield, /* complain_on_overflow */ 203 cris_elf_pcrel_reloc, /* special_function */ 204 "R_CRIS_32_PCREL", /* name */ 205 FALSE, /* partial_inplace */ 206 0x00000000, /* src_mask */ 207 0xffffffff, /* dst_mask */ 208 TRUE), /* pcrel_offset */ 209 210 /* GNU extension to record C++ vtable hierarchy. */ 211 HOWTO (R_CRIS_GNU_VTINHERIT, /* type */ 212 0, /* rightshift */ 213 2, /* size (0 = byte, 1 = short, 2 = long) */ 214 0, /* bitsize */ 215 FALSE, /* pc_relative */ 216 0, /* bitpos */ 217 complain_overflow_dont, /* complain_on_overflow */ 218 NULL, /* special_function */ 219 "R_CRIS_GNU_VTINHERIT", /* name */ 220 FALSE, /* partial_inplace */ 221 0, /* src_mask */ 222 0, /* dst_mask */ 223 FALSE), /* pcrel_offset */ 224 225 /* GNU extension to record C++ vtable member usage. */ 226 HOWTO (R_CRIS_GNU_VTENTRY, /* type */ 227 0, /* rightshift */ 228 2, /* size (0 = byte, 1 = short, 2 = long) */ 229 0, /* bitsize */ 230 FALSE, /* pc_relative */ 231 0, /* bitpos */ 232 complain_overflow_dont, /* complain_on_overflow */ 233 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 234 "R_CRIS_GNU_VTENTRY", /* name */ 235 FALSE, /* partial_inplace */ 236 0, /* src_mask */ 237 0, /* dst_mask */ 238 FALSE), /* pcrel_offset */ 239 240 /* This is used only by the dynamic linker. The symbol should exist 241 both in the object being run and in some shared library. The 242 dynamic linker copies the data addressed by the symbol from the 243 shared library into the object, because the object being 244 run has to have the data at some particular address. */ 245 HOWTO (R_CRIS_COPY, /* type */ 246 0, /* rightshift */ 247 2, /* size (0 = byte, 1 = short, 2 = long) */ 248 32, /* bitsize */ 249 FALSE, /* pc_relative */ 250 0, /* bitpos */ 251 complain_overflow_bitfield, /* complain_on_overflow */ 252 bfd_elf_generic_reloc, /* special_function */ 253 "R_CRIS_COPY", /* name */ 254 FALSE, /* partial_inplace */ 255 0, /* src_mask */ 256 0, /* dst_mask */ 257 FALSE), /* pcrel_offset */ 258 259 /* Like R_CRIS_32, but used when setting global offset table entries. */ 260 HOWTO (R_CRIS_GLOB_DAT, /* type */ 261 0, /* rightshift */ 262 2, /* size (0 = byte, 1 = short, 2 = long) */ 263 32, /* bitsize */ 264 FALSE, /* pc_relative */ 265 0, /* bitpos */ 266 complain_overflow_bitfield, /* complain_on_overflow */ 267 bfd_elf_generic_reloc, /* special_function */ 268 "R_CRIS_GLOB_DAT", /* name */ 269 FALSE, /* partial_inplace */ 270 0, /* src_mask */ 271 0xffffffff, /* dst_mask */ 272 FALSE), /* pcrel_offset */ 273 274 /* Marks a procedure linkage table entry for a symbol. */ 275 HOWTO (R_CRIS_JUMP_SLOT, /* type */ 276 0, /* rightshift */ 277 2, /* size (0 = byte, 1 = short, 2 = long) */ 278 32, /* bitsize */ 279 FALSE, /* pc_relative */ 280 0, /* bitpos */ 281 complain_overflow_bitfield, /* complain_on_overflow */ 282 bfd_elf_generic_reloc, /* special_function */ 283 "R_CRIS_JUMP_SLOT", /* name */ 284 FALSE, /* partial_inplace */ 285 0, /* src_mask */ 286 0, /* dst_mask */ 287 FALSE), /* pcrel_offset */ 288 289 /* Used only by the dynamic linker. When the object is run, this 290 longword is set to the load address of the object, plus the 291 addend. */ 292 HOWTO (R_CRIS_RELATIVE, /* type */ 293 0, /* rightshift */ 294 2, /* size (0 = byte, 1 = short, 2 = long) */ 295 32, /* bitsize */ 296 FALSE, /* pc_relative */ 297 0, /* bitpos */ 298 complain_overflow_bitfield, /* complain_on_overflow */ 299 bfd_elf_generic_reloc, /* special_function */ 300 "R_CRIS_RELATIVE", /* name */ 301 FALSE, /* partial_inplace */ 302 0, /* src_mask */ 303 0xffffffff, /* dst_mask */ 304 FALSE), /* pcrel_offset */ 305 306 /* Like R_CRIS_32, but referring to the GOT table entry for the symbol. */ 307 HOWTO (R_CRIS_16_GOT, /* type */ 308 0, /* rightshift */ 309 1, /* size (0 = byte, 1 = short, 2 = long) */ 310 16, /* bitsize */ 311 FALSE, /* pc_relative */ 312 0, /* bitpos */ 313 complain_overflow_bitfield, /* complain_on_overflow */ 314 bfd_elf_generic_reloc, /* special_function */ 315 "R_CRIS_16_GOT", /* name */ 316 FALSE, /* partial_inplace */ 317 0, /* src_mask */ 318 0xffff, /* dst_mask */ 319 FALSE), /* pcrel_offset */ 320 321 HOWTO (R_CRIS_32_GOT, /* type */ 322 0, /* rightshift */ 323 2, /* size (0 = byte, 1 = short, 2 = long) */ 324 32, /* bitsize */ 325 FALSE, /* pc_relative */ 326 0, /* bitpos */ 327 complain_overflow_bitfield, /* complain_on_overflow */ 328 bfd_elf_generic_reloc, /* special_function */ 329 "R_CRIS_32_GOT", /* name */ 330 FALSE, /* partial_inplace */ 331 0, /* src_mask */ 332 0xffffffff, /* dst_mask */ 333 FALSE), /* pcrel_offset */ 334 335 /* Like R_CRIS_32_GOT, but referring to (and requesting a) PLT part of 336 the GOT table for the symbol. */ 337 HOWTO (R_CRIS_16_GOTPLT, /* type */ 338 0, /* rightshift */ 339 1, /* size (0 = byte, 1 = short, 2 = long) */ 340 16, /* bitsize */ 341 FALSE, /* pc_relative */ 342 0, /* bitpos */ 343 complain_overflow_bitfield, /* complain_on_overflow */ 344 bfd_elf_generic_reloc, /* special_function */ 345 "R_CRIS_16_GOTPLT", /* name */ 346 FALSE, /* partial_inplace */ 347 0, /* src_mask */ 348 0xffff, /* dst_mask */ 349 FALSE), /* pcrel_offset */ 350 351 HOWTO (R_CRIS_32_GOTPLT, /* type */ 352 0, /* rightshift */ 353 2, /* size (0 = byte, 1 = short, 2 = long) */ 354 32, /* bitsize */ 355 FALSE, /* pc_relative */ 356 0, /* bitpos */ 357 complain_overflow_bitfield, /* complain_on_overflow */ 358 bfd_elf_generic_reloc, /* special_function */ 359 "R_CRIS_32_GOTPLT", /* name */ 360 FALSE, /* partial_inplace */ 361 0, /* src_mask */ 362 0xffffffff, /* dst_mask */ 363 FALSE), /* pcrel_offset */ 364 365 /* A 32-bit offset from GOT to (local const) symbol: no GOT entry should 366 be necessary. */ 367 HOWTO (R_CRIS_32_GOTREL, /* type */ 368 0, /* rightshift */ 369 2, /* size (0 = byte, 1 = short, 2 = long) */ 370 32, /* bitsize */ 371 FALSE, /* pc_relative */ 372 0, /* bitpos */ 373 complain_overflow_bitfield, /* complain_on_overflow */ 374 bfd_elf_generic_reloc, /* special_function */ 375 "R_CRIS_32_GOTREL", /* name */ 376 FALSE, /* partial_inplace */ 377 0, /* src_mask */ 378 0xffffffff, /* dst_mask */ 379 FALSE), /* pcrel_offset */ 380 381 /* A 32-bit offset from GOT to entry for this symbol in PLT and request 382 to create PLT entry for symbol. */ 383 HOWTO (R_CRIS_32_PLT_GOTREL, /* type */ 384 0, /* rightshift */ 385 2, /* size (0 = byte, 1 = short, 2 = long) */ 386 32, /* bitsize */ 387 FALSE, /* pc_relative */ 388 0, /* bitpos */ 389 complain_overflow_bitfield, /* complain_on_overflow */ 390 bfd_elf_generic_reloc, /* special_function */ 391 "R_CRIS_32_PLT_GOTREL", /* name */ 392 FALSE, /* partial_inplace */ 393 0, /* src_mask */ 394 0xffffffff, /* dst_mask */ 395 FALSE), /* pcrel_offset */ 396 397 /* A 32-bit offset from PC (location after the relocation) + addend to 398 entry for this symbol in PLT and request to create PLT entry for 399 symbol. */ 400 HOWTO (R_CRIS_32_PLT_PCREL, /* type */ 401 0, /* rightshift */ 402 2, /* size (0 = byte, 1 = short, 2 = long) */ 403 32, /* bitsize */ 404 TRUE, /* pc_relative */ 405 0, /* bitpos */ 406 complain_overflow_bitfield, /* complain_on_overflow */ 407 cris_elf_pcrel_reloc, /* special_function */ 408 "R_CRIS_32_PLT_PCREL", /* name */ 409 FALSE, /* partial_inplace */ 410 0, /* src_mask */ 411 0xffffffff, /* dst_mask */ 412 TRUE) /* pcrel_offset */ 413}; 414 415/* Map BFD reloc types to CRIS ELF reloc types. */ 416 417struct cris_reloc_map 418{ 419 bfd_reloc_code_real_type bfd_reloc_val; 420 unsigned int cris_reloc_val; 421}; 422 423static const struct cris_reloc_map cris_reloc_map [] = 424{ 425 { BFD_RELOC_NONE, R_CRIS_NONE }, 426 { BFD_RELOC_8, R_CRIS_8 }, 427 { BFD_RELOC_16, R_CRIS_16 }, 428 { BFD_RELOC_32, R_CRIS_32 }, 429 { BFD_RELOC_8_PCREL, R_CRIS_8_PCREL }, 430 { BFD_RELOC_16_PCREL, R_CRIS_16_PCREL }, 431 { BFD_RELOC_32_PCREL, R_CRIS_32_PCREL }, 432 { BFD_RELOC_VTABLE_INHERIT, R_CRIS_GNU_VTINHERIT }, 433 { BFD_RELOC_VTABLE_ENTRY, R_CRIS_GNU_VTENTRY }, 434 { BFD_RELOC_CRIS_COPY, R_CRIS_COPY }, 435 { BFD_RELOC_CRIS_GLOB_DAT, R_CRIS_GLOB_DAT }, 436 { BFD_RELOC_CRIS_JUMP_SLOT, R_CRIS_JUMP_SLOT }, 437 { BFD_RELOC_CRIS_RELATIVE, R_CRIS_RELATIVE }, 438 { BFD_RELOC_CRIS_16_GOT, R_CRIS_16_GOT }, 439 { BFD_RELOC_CRIS_32_GOT, R_CRIS_32_GOT }, 440 { BFD_RELOC_CRIS_16_GOTPLT, R_CRIS_16_GOTPLT }, 441 { BFD_RELOC_CRIS_32_GOTPLT, R_CRIS_32_GOTPLT }, 442 { BFD_RELOC_CRIS_32_GOTREL, R_CRIS_32_GOTREL }, 443 { BFD_RELOC_CRIS_32_PLT_GOTREL, R_CRIS_32_PLT_GOTREL }, 444 { BFD_RELOC_CRIS_32_PLT_PCREL, R_CRIS_32_PLT_PCREL } 445}; 446 447static reloc_howto_type * 448cris_reloc_type_lookup (abfd, code) 449 bfd * abfd ATTRIBUTE_UNUSED; 450 bfd_reloc_code_real_type code; 451{ 452 unsigned int i; 453 454 for (i = 0; i < sizeof (cris_reloc_map) / sizeof (cris_reloc_map[0]); i++) 455 if (cris_reloc_map [i].bfd_reloc_val == code) 456 return & cris_elf_howto_table [cris_reloc_map[i].cris_reloc_val]; 457 458 return NULL; 459} 460 461static reloc_howto_type * 462cris_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) 463{ 464 unsigned int i; 465 466 for (i = 0; 467 i < sizeof (cris_elf_howto_table) / sizeof (cris_elf_howto_table[0]); 468 i++) 469 if (cris_elf_howto_table[i].name != NULL 470 && strcasecmp (cris_elf_howto_table[i].name, r_name) == 0) 471 return &cris_elf_howto_table[i]; 472 473 return NULL; 474} 475 476/* Set the howto pointer for an CRIS ELF reloc. */ 477 478static void 479cris_info_to_howto_rela (abfd, cache_ptr, dst) 480 bfd * abfd ATTRIBUTE_UNUSED; 481 arelent * cache_ptr; 482 Elf_Internal_Rela * dst; 483{ 484 unsigned int r_type; 485 486 r_type = ELF32_R_TYPE (dst->r_info); 487 BFD_ASSERT (r_type < (unsigned int) R_CRIS_max); 488 cache_ptr->howto = & cris_elf_howto_table [r_type]; 489} 490 491bfd_reloc_status_type 492cris_elf_pcrel_reloc (abfd, reloc_entry, symbol, data, input_section, 493 output_bfd, error_message) 494 bfd *abfd ATTRIBUTE_UNUSED; 495 arelent *reloc_entry; 496 asymbol *symbol; 497 PTR data ATTRIBUTE_UNUSED; 498 asection *input_section; 499 bfd *output_bfd; 500 char **error_message ATTRIBUTE_UNUSED; 501{ 502 /* By default (using only bfd_elf_generic_reloc when linking to 503 non-ELF formats) PC-relative relocs are relative to the beginning 504 of the reloc. CRIS PC-relative relocs are relative to the position 505 *after* the reloc because that's what pre-CRISv32 PC points to 506 after reading an insn field with that reloc. (For CRISv32, PC is 507 actually relative to the start of the insn, but we keep the old 508 definition.) Still, we use as much generic machinery as we can. 509 510 Only adjust when doing a final link. */ 511 if (output_bfd == (bfd *) NULL) 512 reloc_entry->addend -= 1 << reloc_entry->howto->size; 513 514 return 515 bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 516 input_section, output_bfd, error_message); 517} 518 519/* Support for core dump NOTE sections. 520 The slightly unintuitive code layout is an attempt to keep at least 521 some similarities with other ports, hoping to simplify general 522 changes, while still keeping Linux/CRIS and Linux/CRISv32 code apart. */ 523 524static bfd_boolean 525cris_elf_grok_prstatus (abfd, note) 526 bfd *abfd; 527 Elf_Internal_Note *note; 528{ 529 int offset; 530 size_t size; 531 532 if (bfd_get_mach (abfd) == bfd_mach_cris_v32) 533 switch (note->descsz) 534 { 535 default: 536 return FALSE; 537 538 case 202: /* Linux/CRISv32 */ 539 /* pr_cursig */ 540 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 541 542 /* pr_pid */ 543 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 22); 544 545 /* pr_reg */ 546 offset = 70; 547 size = 128; 548 549 break; 550 } 551 else 552 switch (note->descsz) 553 { 554 default: 555 return FALSE; 556 557 case 214: /* Linux/CRIS */ 558 /* pr_cursig */ 559 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 560 561 /* pr_pid */ 562 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 22); 563 564 /* pr_reg */ 565 offset = 70; 566 size = 140; 567 568 break; 569 } 570 571 /* Make a ".reg/999" section. */ 572 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 573 size, note->descpos + offset); 574} 575 576static bfd_boolean 577cris_elf_grok_psinfo (abfd, note) 578 bfd *abfd; 579 Elf_Internal_Note *note; 580{ 581 if (bfd_get_mach (abfd) == bfd_mach_cris_v32) 582 switch (note->descsz) 583 { 584 default: 585 return FALSE; 586 587 case 124: /* Linux/CRISv32 elf_prpsinfo */ 588 elf_tdata (abfd)->core_program 589 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 590 elf_tdata (abfd)->core_command 591 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 592 } 593 else 594 switch (note->descsz) 595 { 596 default: 597 return FALSE; 598 599 case 124: /* Linux/CRIS elf_prpsinfo */ 600 elf_tdata (abfd)->core_program 601 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 602 elf_tdata (abfd)->core_command 603 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 604 } 605 606 /* Note that for some reason, a spurious space is tacked 607 onto the end of the args in some (at least one anyway) 608 implementations, so strip it off if it exists. */ 609 610 { 611 char *command = elf_tdata (abfd)->core_command; 612 int n = strlen (command); 613 614 if (0 < n && command[n - 1] == ' ') 615 command[n - 1] = '\0'; 616 } 617 618 return TRUE; 619} 620 621/* The name of the dynamic interpreter. This is put in the .interp 622 section. */ 623 624#define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" 625 626/* The size in bytes of an entry in the procedure linkage table. */ 627 628#define PLT_ENTRY_SIZE 20 629#define PLT_ENTRY_SIZE_V32 26 630 631/* The first entry in an absolute procedure linkage table looks like this. */ 632 633static const bfd_byte elf_cris_plt0_entry[PLT_ENTRY_SIZE] = 634{ 635 0xfc, 0xe1, 636 0x7e, 0x7e, /* push mof. */ 637 0x7f, 0x0d, /* (dip [pc+]) */ 638 0, 0, 0, 0, /* Replaced with address of .got + 4. */ 639 0x30, 0x7a, /* move [...],mof */ 640 0x7f, 0x0d, /* (dip [pc+]) */ 641 0, 0, 0, 0, /* Replaced with address of .got + 8. */ 642 0x30, 0x09 /* jump [...] */ 643}; 644 645static const bfd_byte elf_cris_plt0_entry_v32[PLT_ENTRY_SIZE_V32] = 646{ 647 0x84, 0xe2, /* subq 4,$sp */ 648 0x6f, 0xfe, /* move.d 0,$acr */ 649 0, 0, 0, 0, /* Replaced by address of .got + 4. */ 650 0x7e, 0x7a, /* move $mof,[$sp] */ 651 0x3f, 0x7a, /* move [$acr],$mof */ 652 0x04, 0xf2, /* addq 4,acr */ 653 0x6f, 0xfa, /* move.d [$acr],$acr */ 654 0xbf, 0x09, /* jump $acr */ 655 0xb0, 0x05, /* nop */ 656 0, 0 /* Pad out to 26 bytes. */ 657}; 658 659/* Subsequent entries in an absolute procedure linkage table look like 660 this. */ 661 662static const bfd_byte elf_cris_plt_entry[PLT_ENTRY_SIZE] = 663{ 664 0x7f, 0x0d, /* (dip [pc+]) */ 665 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */ 666 0x30, 0x09, /* jump [...] */ 667 0x3f, 0x7e, /* move [pc+],mof */ 668 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 669 0x2f, 0xfe, /* add.d [pc+],pc */ 670 0xec, 0xff, 671 0xff, 0xff /* Replaced with offset to start of .plt. */ 672}; 673 674static const bfd_byte elf_cris_plt_entry_v32[PLT_ENTRY_SIZE_V32] = 675{ 676 0x6f, 0xfe, /* move.d 0,$acr */ 677 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */ 678 0x6f, 0xfa, /* move.d [$acr],$acr */ 679 0xbf, 0x09, /* jump $acr */ 680 0xb0, 0x05, /* nop */ 681 0x3f, 0x7e, /* move 0,mof */ 682 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 683 0xbf, 0x0e, /* ba start_of_plt0_entry */ 684 0, 0, 0, 0, /* Replaced with offset to plt0 entry. */ 685 0xb0, 0x05 /* nop */ 686}; 687 688/* The first entry in a PIC procedure linkage table looks like this. */ 689 690static const bfd_byte elf_cris_pic_plt0_entry[PLT_ENTRY_SIZE] = 691{ 692 0xfc, 0xe1, 0x7e, 0x7e, /* push mof */ 693 0x04, 0x01, 0x30, 0x7a, /* move [r0+4],mof */ 694 0x08, 0x01, 0x30, 0x09, /* jump [r0+8] */ 695 0, 0, 0, 0, 0, 0, 0, 0, /* Pad out to 20 bytes. */ 696}; 697 698static const bfd_byte elf_cris_pic_plt0_entry_v32[PLT_ENTRY_SIZE_V32] = 699{ 700 0x84, 0xe2, /* subq 4,$sp */ 701 0x04, 0x01, /* addoq 4,$r0,$acr */ 702 0x7e, 0x7a, /* move $mof,[$sp] */ 703 0x3f, 0x7a, /* move [$acr],$mof */ 704 0x04, 0xf2, /* addq 4,$acr */ 705 0x6f, 0xfa, /* move.d [$acr],$acr */ 706 0xbf, 0x09, /* jump $acr */ 707 0xb0, 0x05, /* nop */ 708 0, 0, /* Pad out to 26 bytes. */ 709 0, 0, 0, 0, 710 0, 0, 0, 0 711}; 712 713/* Subsequent entries in a PIC procedure linkage table look like this. */ 714 715static const bfd_byte elf_cris_pic_plt_entry[PLT_ENTRY_SIZE] = 716{ 717 0x6f, 0x0d, /* (bdap [pc+].d,r0) */ 718 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */ 719 0x30, 0x09, /* jump [...] */ 720 0x3f, 0x7e, /* move [pc+],mof */ 721 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 722 0x2f, 0xfe, /* add.d [pc+],pc */ 723 0xec, 0xff, /* Replaced with offset to start of .plt. */ 724 0xff, 0xff 725}; 726 727static const bfd_byte elf_cris_pic_plt_entry_v32[PLT_ENTRY_SIZE_V32] = 728{ 729 0x6f, 0x0d, /* addo.d 0,$r0,$acr */ 730 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */ 731 0x6f, 0xfa, /* move.d [$acr],$acr */ 732 0xbf, 0x09, /* jump $acr */ 733 0xb0, 0x05, /* nop */ 734 0x3f, 0x7e, /* move relocoffs,$mof */ 735 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 736 0xbf, 0x0e, /* ba start_of_plt */ 737 0, 0, 0, 0, /* Replaced with offset to start of .plt. */ 738 0xb0, 0x05 /* nop */ 739}; 740 741/* We copy elf32-m68k.c and elf32-i386.c for the basic linker hash bits 742 (and most other PIC/shlib stuff). Check that we don't drift away 743 without reason. 744 745 The CRIS linker, like the m68k and i386 linkers (and probably the rest 746 too) needs to keep track of the number of relocs that it decides to 747 copy in check_relocs for each symbol. This is so that it can discard 748 PC relative relocs if it doesn't need them when linking with 749 -Bsymbolic. We store the information in a field extending the regular 750 ELF linker hash table. */ 751 752/* This structure keeps track of the number of PC relative relocs we have 753 copied for a given symbol. */ 754 755struct elf_cris_pcrel_relocs_copied 756{ 757 /* Next section. */ 758 struct elf_cris_pcrel_relocs_copied *next; 759 /* A section in dynobj. */ 760 asection *section; 761 /* Number of relocs copied in this section. */ 762 bfd_size_type count; 763}; 764 765/* CRIS ELF linker hash entry. */ 766 767struct elf_cris_link_hash_entry 768{ 769 struct elf_link_hash_entry root; 770 771 /* Number of PC relative relocs copied for this symbol. */ 772 struct elf_cris_pcrel_relocs_copied *pcrel_relocs_copied; 773 774 /* The GOTPLT references are CRIS-specific; the goal is to avoid having 775 both a general GOT and a PLT-specific GOT entry for the same symbol, 776 when it is referenced both as a function and as a function pointer. 777 778 Number of GOTPLT references for a function. */ 779 bfd_signed_vma gotplt_refcount; 780 781 /* Actual GOTPLT index for this symbol, if applicable, or zero if not 782 (zero is never used as an index). FIXME: We should be able to fold 783 this with gotplt_refcount in a union, like the got and plt unions in 784 elf_link_hash_entry. */ 785 bfd_size_type gotplt_offset; 786}; 787 788/* CRIS ELF linker hash table. */ 789 790struct elf_cris_link_hash_table 791{ 792 struct elf_link_hash_table root; 793 794 /* We can't use the PLT offset and calculate to get the GOTPLT offset, 795 since we try and avoid creating GOTPLT:s when there's already a GOT. 796 Instead, we keep and update the next available index here. */ 797 bfd_size_type next_gotplt_entry; 798}; 799 800/* Traverse a CRIS ELF linker hash table. */ 801 802#define elf_cris_link_hash_traverse(table, func, info) \ 803 (elf_link_hash_traverse \ 804 (&(table)->root, \ 805 (bfd_boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ 806 (info))) 807 808/* Get the CRIS ELF linker hash table from a link_info structure. */ 809 810#define elf_cris_hash_table(p) \ 811 ((struct elf_cris_link_hash_table *) (p)->hash) 812 813/* Create an entry in a CRIS ELF linker hash table. */ 814 815static struct bfd_hash_entry * 816elf_cris_link_hash_newfunc (entry, table, string) 817 struct bfd_hash_entry *entry; 818 struct bfd_hash_table *table; 819 const char *string; 820{ 821 struct elf_cris_link_hash_entry *ret = 822 (struct elf_cris_link_hash_entry *) entry; 823 824 /* Allocate the structure if it has not already been allocated by a 825 subclass. */ 826 if (ret == (struct elf_cris_link_hash_entry *) NULL) 827 ret = ((struct elf_cris_link_hash_entry *) 828 bfd_hash_allocate (table, 829 sizeof (struct elf_cris_link_hash_entry))); 830 if (ret == (struct elf_cris_link_hash_entry *) NULL) 831 return (struct bfd_hash_entry *) ret; 832 833 /* Call the allocation method of the superclass. */ 834 ret = ((struct elf_cris_link_hash_entry *) 835 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 836 table, string)); 837 if (ret != (struct elf_cris_link_hash_entry *) NULL) 838 { 839 ret->pcrel_relocs_copied = NULL; 840 ret->gotplt_refcount = 0; 841 ret->gotplt_offset = 0; 842 } 843 844 return (struct bfd_hash_entry *) ret; 845} 846 847/* Create a CRIS ELF linker hash table. */ 848 849static struct bfd_link_hash_table * 850elf_cris_link_hash_table_create (abfd) 851 bfd *abfd; 852{ 853 struct elf_cris_link_hash_table *ret; 854 bfd_size_type amt = sizeof (struct elf_cris_link_hash_table); 855 856 ret = ((struct elf_cris_link_hash_table *) bfd_malloc (amt)); 857 if (ret == (struct elf_cris_link_hash_table *) NULL) 858 return NULL; 859 860 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 861 elf_cris_link_hash_newfunc, 862 sizeof (struct elf_cris_link_hash_entry))) 863 { 864 free (ret); 865 return NULL; 866 } 867 868 /* Initialize to skip over the first three entries in the gotplt; they 869 are used for run-time symbol evaluation. */ 870 ret->next_gotplt_entry = 12; 871 872 return &ret->root.root; 873} 874 875/* Perform a single relocation. By default we use the standard BFD 876 routines, with a few tweaks. */ 877 878static bfd_reloc_status_type 879cris_final_link_relocate (howto, input_bfd, input_section, contents, rel, 880 relocation) 881 reloc_howto_type * howto; 882 bfd * input_bfd; 883 asection * input_section; 884 bfd_byte * contents; 885 Elf_Internal_Rela * rel; 886 bfd_vma relocation; 887{ 888 bfd_reloc_status_type r; 889 890 /* PC-relative relocations are relative to the position *after* 891 the reloc. Note that for R_CRIS_8_PCREL the adjustment is 892 not a single byte, since PC must be 16-bit-aligned. */ 893 switch (ELF32_R_TYPE (rel->r_info)) 894 { 895 /* Check that the 16-bit GOT relocs are positive. */ 896 case R_CRIS_16_GOTPLT: 897 case R_CRIS_16_GOT: 898 if ((bfd_signed_vma) relocation < 0) 899 return bfd_reloc_overflow; 900 break; 901 902 case R_CRIS_32_PLT_PCREL: 903 case R_CRIS_32_PCREL: 904 relocation -= 2; 905 /* Fall through. */ 906 case R_CRIS_8_PCREL: 907 case R_CRIS_16_PCREL: 908 relocation -= 2; 909 break; 910 911 default: 912 break; 913 } 914 915 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 916 contents, rel->r_offset, 917 relocation, rel->r_addend); 918 return r; 919} 920 921/* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was 922 copied, for further comments. */ 923 924static bfd_boolean 925cris_elf_relocate_section (output_bfd, info, input_bfd, input_section, 926 contents, relocs, local_syms, local_sections) 927 bfd *output_bfd ATTRIBUTE_UNUSED; 928 struct bfd_link_info *info; 929 bfd *input_bfd; 930 asection *input_section; 931 bfd_byte *contents; 932 Elf_Internal_Rela *relocs; 933 Elf_Internal_Sym *local_syms; 934 asection **local_sections; 935{ 936 bfd *dynobj; 937 Elf_Internal_Shdr *symtab_hdr; 938 struct elf_link_hash_entry **sym_hashes; 939 bfd_vma *local_got_offsets; 940 asection *sgot; 941 asection *splt; 942 asection *sreloc; 943 Elf_Internal_Rela *rel; 944 Elf_Internal_Rela *relend; 945 946 dynobj = elf_hash_table (info)->dynobj; 947 local_got_offsets = elf_local_got_offsets (input_bfd); 948 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 949 sym_hashes = elf_sym_hashes (input_bfd); 950 relend = relocs + input_section->reloc_count; 951 952 sgot = NULL; 953 splt = NULL; 954 sreloc = NULL; 955 956 if (dynobj != NULL) 957 { 958 splt = bfd_get_section_by_name (dynobj, ".plt"); 959 sgot = bfd_get_section_by_name (dynobj, ".got"); 960 } 961 962 for (rel = relocs; rel < relend; rel ++) 963 { 964 reloc_howto_type *howto; 965 unsigned long r_symndx; 966 Elf_Internal_Sym *sym; 967 asection *sec; 968 struct elf_link_hash_entry *h; 969 bfd_vma relocation; 970 bfd_reloc_status_type r; 971 const char *symname = NULL; 972 int r_type; 973 974 r_type = ELF32_R_TYPE (rel->r_info); 975 976 if ( r_type == R_CRIS_GNU_VTINHERIT 977 || r_type == R_CRIS_GNU_VTENTRY) 978 continue; 979 980 r_symndx = ELF32_R_SYM (rel->r_info); 981 howto = cris_elf_howto_table + r_type; 982 h = NULL; 983 sym = NULL; 984 sec = NULL; 985 986 if (r_symndx < symtab_hdr->sh_info) 987 { 988 sym = local_syms + r_symndx; 989 sec = local_sections [r_symndx]; 990 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 991 992 symname = (bfd_elf_string_from_elf_section 993 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 994 if (symname == NULL) 995 symname = bfd_section_name (input_bfd, sec); 996 } 997 else 998 { 999 bfd_boolean warned; 1000 bfd_boolean unresolved_reloc; 1001 1002 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1003 r_symndx, symtab_hdr, sym_hashes, 1004 h, sec, relocation, 1005 unresolved_reloc, warned); 1006 1007 if (unresolved_reloc 1008 /* Perhaps we should detect the cases that 1009 sec->output_section is expected to be NULL like i386 and 1010 m68k, but apparently (and according to elfxx-ia64.c) all 1011 valid cases are where the symbol is defined in a shared 1012 object which we link dynamically against. This includes 1013 PLT relocs for which we've created a PLT entry and other 1014 relocs for which we're prepared to create dynamic 1015 relocations. 1016 1017 For now, new situations cause us to just err when 1018 sec->output_offset is NULL but the object with the symbol 1019 is *not* dynamically linked against. Thus this will 1020 automatically remind us so we can see if there are other 1021 valid cases we need to revisit. */ 1022 && (sec->owner->flags & DYNAMIC) != 0) 1023 relocation = 0; 1024 1025 else if (h->root.type == bfd_link_hash_defined 1026 || h->root.type == bfd_link_hash_defweak) 1027 { 1028 /* Here follow the cases where the relocation value must 1029 be zero (or when further handling is simplified when 1030 zero). I can't claim to understand the various 1031 conditions and they weren't described in the files 1032 where I copied them from (elf32-m68k.c and 1033 elf32-i386.c), but let's mention examples of where 1034 they happen. FIXME: Perhaps define and use a 1035 dynamic_symbol_p function like ia64. 1036 1037 - When creating a shared library, we can have an 1038 ordinary relocation for a symbol defined in a shared 1039 library (perhaps the one we create). We then make 1040 the relocation value zero, as the value seen now will 1041 be added into the relocation addend in this shared 1042 library, but must be handled only at dynamic-link 1043 time. FIXME: Not sure this example covers the 1044 h->elf_link_hash_flags test, though it's there in 1045 other targets. */ 1046 if (info->shared 1047 && ((! info->symbolic && h->dynindx != -1) 1048 || !h->def_regular) 1049 && (input_section->flags & SEC_ALLOC) != 0 1050 && (r_type == R_CRIS_8 1051 || r_type == R_CRIS_16 1052 || r_type == R_CRIS_32 1053 || r_type == R_CRIS_8_PCREL 1054 || r_type == R_CRIS_16_PCREL 1055 || r_type == R_CRIS_32_PCREL)) 1056 relocation = 0; 1057 else if (!info->relocatable && unresolved_reloc) 1058 { 1059 _bfd_error_handler 1060 (_("%B, section %A: unresolvable relocation %s against symbol `%s'"), 1061 input_bfd, 1062 input_section, 1063 cris_elf_howto_table[r_type].name, 1064 symname); 1065 bfd_set_error (bfd_error_bad_value); 1066 return FALSE; 1067 } 1068 } 1069 } 1070 1071 if (sec != NULL && elf_discarded_section (sec)) 1072 { 1073 /* For relocs against symbols from removed linkonce sections, 1074 or sections discarded by a linker script, we just want the 1075 section contents zeroed. Avoid any special processing. */ 1076 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); 1077 rel->r_info = 0; 1078 rel->r_addend = 0; 1079 continue; 1080 } 1081 1082 if (info->relocatable) 1083 continue; 1084 1085 switch (r_type) 1086 { 1087 case R_CRIS_16_GOTPLT: 1088 case R_CRIS_32_GOTPLT: 1089 /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT, 1090 but we require a PLT, and the PLT handling will take care of 1091 filling in the PLT-specific GOT entry. For the GOT offset, 1092 calculate it as we do when filling it in for the .got.plt 1093 section. If we don't have a PLT, punt to GOT handling. */ 1094 if (h != NULL 1095 && ((struct elf_cris_link_hash_entry *) h)->gotplt_offset != 0) 1096 { 1097 asection *sgotplt 1098 = bfd_get_section_by_name (dynobj, ".got.plt"); 1099 bfd_vma got_offset; 1100 1101 BFD_ASSERT (h->dynindx != -1); 1102 BFD_ASSERT (sgotplt != NULL); 1103 1104 got_offset 1105 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset; 1106 1107 relocation = got_offset; 1108 break; 1109 } 1110 1111 /* We didn't make a PLT entry for this symbol. Maybe everything is 1112 folded into the GOT. Other than folding, this happens when 1113 statically linking PIC code, or when using -Bsymbolic. Check 1114 that we instead have a GOT entry as done for us by 1115 elf_cris_adjust_dynamic_symbol, and drop through into the 1116 ordinary GOT cases. This must not happen for the 1117 executable, because any reference it does to a function 1118 that is satisfied by a DSO must generate a PLT. We assume 1119 these call-specific relocs don't address non-functions. */ 1120 if (h != NULL 1121 && (h->got.offset == (bfd_vma) -1 1122 || (!info->shared 1123 && !(h->def_regular 1124 || (!h->def_dynamic 1125 && h->root.type == bfd_link_hash_undefweak))))) 1126 { 1127 (*_bfd_error_handler) 1128 ((h->got.offset == (bfd_vma) -1) 1129 ? _("%B, section %A: No PLT nor GOT for relocation %s" 1130 " against symbol `%s'") 1131 : _("%B, section %A: No PLT for relocation %s" 1132 " against symbol `%s'"), 1133 input_bfd, 1134 input_section, 1135 cris_elf_howto_table[r_type].name, 1136 (symname != NULL && symname[0] != '\0' 1137 ? symname : _("[whose name is lost]"))); 1138 1139 /* FIXME: Perhaps blaming input is not the right thing to 1140 do; this is probably an internal error. But it is true 1141 that we didn't like that particular input. */ 1142 bfd_set_error (bfd_error_bad_value); 1143 return FALSE; 1144 } 1145 /* Fall through. */ 1146 1147 /* The size of the actual relocation is not used here; we only 1148 fill in the GOT table here. */ 1149 case R_CRIS_16_GOT: 1150 case R_CRIS_32_GOT: 1151 { 1152 bfd_vma off; 1153 1154 /* Note that despite using RELA relocations, the .got contents 1155 is always filled in with the link-relative relocation 1156 value; the addend. */ 1157 1158 if (h != NULL) 1159 { 1160 off = h->got.offset; 1161 BFD_ASSERT (off != (bfd_vma) -1); 1162 1163 if (!elf_hash_table (info)->dynamic_sections_created 1164 || (! info->shared 1165 && (h->def_regular 1166 || h->type == STT_FUNC 1167 || h->needs_plt)) 1168 || (info->shared 1169 && (info->symbolic || h->dynindx == -1) 1170 && h->def_regular)) 1171 { 1172 /* This wasn't checked above for ! info->shared, but 1173 must hold there if we get here; the symbol must 1174 be defined in the regular program or be undefweak 1175 or be a function or otherwise need a PLT. */ 1176 BFD_ASSERT (!elf_hash_table (info)->dynamic_sections_created 1177 || info->shared 1178 || h->def_regular 1179 || h->type == STT_FUNC 1180 || h->needs_plt 1181 || h->root.type == bfd_link_hash_undefweak); 1182 1183 /* This is actually a static link, or it is a 1184 -Bsymbolic link and the symbol is defined locally, 1185 or is undefweak, or the symbol was forced to be 1186 local because of a version file, or we're not 1187 creating a dynamic object. We must initialize this 1188 entry in the global offset table. Since the offset 1189 must always be a multiple of 4, we use the least 1190 significant bit to record whether we have 1191 initialized it already. 1192 1193 If this GOT entry should be runtime-initialized, we 1194 will create a .rela.got relocation entry to 1195 initialize the value. This is done in the 1196 finish_dynamic_symbol routine. */ 1197 if ((off & 1) != 0) 1198 off &= ~1; 1199 else 1200 { 1201 bfd_put_32 (output_bfd, relocation, 1202 sgot->contents + off); 1203 h->got.offset |= 1; 1204 } 1205 } 1206 } 1207 else 1208 { 1209 BFD_ASSERT (local_got_offsets != NULL 1210 && local_got_offsets[r_symndx] != (bfd_vma) -1); 1211 1212 off = local_got_offsets[r_symndx]; 1213 1214 /* The offset must always be a multiple of 4. We use 1215 the least significant bit to record whether we have 1216 already generated the necessary reloc. */ 1217 if ((off & 1) != 0) 1218 off &= ~1; 1219 else 1220 { 1221 bfd_put_32 (output_bfd, relocation, sgot->contents + off); 1222 1223 if (info->shared) 1224 { 1225 asection *s; 1226 Elf_Internal_Rela outrel; 1227 bfd_byte *loc; 1228 1229 s = bfd_get_section_by_name (dynobj, ".rela.got"); 1230 BFD_ASSERT (s != NULL); 1231 1232 outrel.r_offset = (sgot->output_section->vma 1233 + sgot->output_offset 1234 + off); 1235 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); 1236 outrel.r_addend = relocation; 1237 loc = s->contents; 1238 loc += s->reloc_count++ * sizeof (Elf32_External_Rela); 1239 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1240 } 1241 1242 local_got_offsets[r_symndx] |= 1; 1243 } 1244 } 1245 1246 relocation = sgot->output_offset + off; 1247 if (rel->r_addend != 0) 1248 { 1249 /* We can't do anything for a relocation which is against 1250 a symbol *plus offset*. GOT holds relocations for 1251 symbols. Make this an error; the compiler isn't 1252 allowed to pass us these kinds of things. */ 1253 if (h == NULL) 1254 (*_bfd_error_handler) 1255 (_("%B, section %A: relocation %s with non-zero addend %d" 1256 " against local symbol"), 1257 input_bfd, 1258 input_section, 1259 cris_elf_howto_table[r_type].name, 1260 rel->r_addend); 1261 else 1262 (*_bfd_error_handler) 1263 (_("%B, section %A: relocation %s with non-zero addend %d" 1264 " against symbol `%s'"), 1265 input_bfd, 1266 input_section, 1267 cris_elf_howto_table[r_type].name, 1268 rel->r_addend, 1269 symname[0] != '\0' ? symname : _("[whose name is lost]")); 1270 1271 bfd_set_error (bfd_error_bad_value); 1272 return FALSE; 1273 } 1274 } 1275 break; 1276 1277 case R_CRIS_32_GOTREL: 1278 /* This relocation must only be performed against local symbols. 1279 It's also ok when we link a program and the symbol is either 1280 defined in an ordinary (non-DSO) object or is undefined weak. */ 1281 if (h != NULL 1282 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1283 && !(!info->shared 1284 && (h->def_regular 1285 || (!h->def_dynamic 1286 && h->root.type == bfd_link_hash_undefweak)))) 1287 { 1288 (*_bfd_error_handler) 1289 (_("%B, section %A: relocation %s is" 1290 " not allowed for global symbol: `%s'"), 1291 input_bfd, 1292 input_section, 1293 cris_elf_howto_table[r_type].name, 1294 symname); 1295 bfd_set_error (bfd_error_bad_value); 1296 return FALSE; 1297 } 1298 1299 /* This can happen if we get a link error with the input ELF 1300 variant mismatching the output variant. Emit an error so 1301 it's noticed if it happens elsewhere. */ 1302 if (sgot == NULL) 1303 { 1304 (*_bfd_error_handler) 1305 (_("%B, section %A: relocation %s with no GOT created"), 1306 input_bfd, 1307 input_section, 1308 cris_elf_howto_table[r_type].name); 1309 bfd_set_error (bfd_error_bad_value); 1310 return FALSE; 1311 } 1312 1313 /* This relocation is like a PC-relative one, except the 1314 reference point is the location of GOT. Note that 1315 sgot->output_offset is not involved in this calculation. We 1316 always want the start of entire .got section, not the 1317 position after the reserved header. */ 1318 relocation -= sgot->output_section->vma; 1319 break; 1320 1321 case R_CRIS_32_PLT_PCREL: 1322 /* Relocation is to the entry for this symbol in the 1323 procedure linkage table. */ 1324 1325 /* Resolve a PLT_PCREL reloc against a local symbol directly, 1326 without using the procedure linkage table. */ 1327 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1328 break; 1329 1330 if (h->plt.offset == (bfd_vma) -1 1331 || splt == NULL) 1332 { 1333 /* We didn't make a PLT entry for this symbol. This 1334 happens when statically linking PIC code, or when 1335 using -Bsymbolic. */ 1336 break; 1337 } 1338 1339 relocation = (splt->output_section->vma 1340 + splt->output_offset 1341 + h->plt.offset); 1342 break; 1343 1344 case R_CRIS_32_PLT_GOTREL: 1345 /* Like R_CRIS_32_PLT_PCREL, but the reference point is the 1346 start of the .got section. See also comment at 1347 R_CRIS_32_GOT. */ 1348 relocation -= sgot->output_section->vma; 1349 1350 /* Resolve a PLT_GOTREL reloc against a local symbol directly, 1351 without using the procedure linkage table. */ 1352 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1353 break; 1354 1355 if (h->plt.offset == (bfd_vma) -1 1356 || splt == NULL) 1357 { 1358 /* We didn't make a PLT entry for this symbol. This 1359 happens when statically linking PIC code, or when 1360 using -Bsymbolic. */ 1361 break; 1362 } 1363 1364 relocation = (splt->output_section->vma 1365 + splt->output_offset 1366 + h->plt.offset 1367 - sgot->output_section->vma); 1368 break; 1369 1370 case R_CRIS_8_PCREL: 1371 case R_CRIS_16_PCREL: 1372 case R_CRIS_32_PCREL: 1373 /* If the symbol was local, we need no shlib-specific handling. */ 1374 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1375 break; 1376 1377 /* Fall through. */ 1378 case R_CRIS_8: 1379 case R_CRIS_16: 1380 case R_CRIS_32: 1381 if (info->shared 1382 && r_symndx != 0 1383 && (input_section->flags & SEC_ALLOC) != 0 1384 && ((r_type != R_CRIS_8_PCREL 1385 && r_type != R_CRIS_16_PCREL 1386 && r_type != R_CRIS_32_PCREL) 1387 || (!info->symbolic 1388 || !h->def_regular))) 1389 { 1390 Elf_Internal_Rela outrel; 1391 bfd_byte *loc; 1392 bfd_boolean skip, relocate; 1393 1394 /* When generating a shared object, these relocations 1395 are copied into the output file to be resolved at run 1396 time. */ 1397 1398 if (sreloc == NULL) 1399 { 1400 const char *name; 1401 1402 name = (bfd_elf_string_from_elf_section 1403 (input_bfd, 1404 elf_elfheader (input_bfd)->e_shstrndx, 1405 elf_section_data (input_section)->rel_hdr.sh_name)); 1406 if (name == NULL) 1407 return FALSE; 1408 1409 BFD_ASSERT (CONST_STRNEQ (name, ".rela") 1410 && strcmp (bfd_get_section_name (input_bfd, 1411 input_section), 1412 name + 5) == 0); 1413 1414 sreloc = bfd_get_section_by_name (dynobj, name); 1415 1416 /* That section should have been created in 1417 cris_elf_check_relocs, but that function will not be 1418 called for objects which fail in 1419 cris_elf_merge_private_bfd_data. */ 1420 if (sreloc == NULL) 1421 { 1422 (*_bfd_error_handler) 1423 (_("%B: Internal inconsistency; no relocation section %s"), 1424 input_bfd, 1425 name); 1426 1427 bfd_set_error (bfd_error_bad_value); 1428 return FALSE; 1429 } 1430 } 1431 1432 skip = FALSE; 1433 relocate = FALSE; 1434 1435 outrel.r_offset = 1436 _bfd_elf_section_offset (output_bfd, info, input_section, 1437 rel->r_offset); 1438 if (outrel.r_offset == (bfd_vma) -1) 1439 skip = TRUE; 1440 else if (outrel.r_offset == (bfd_vma) -2) 1441 skip = TRUE, relocate = TRUE; 1442 outrel.r_offset += (input_section->output_section->vma 1443 + input_section->output_offset); 1444 1445 if (skip) 1446 memset (&outrel, 0, sizeof outrel); 1447 /* h->dynindx may be -1 if the symbol was marked to 1448 become local. */ 1449 else if (h != NULL 1450 && ((! info->symbolic && h->dynindx != -1) 1451 || !h->def_regular)) 1452 { 1453 BFD_ASSERT (h->dynindx != -1); 1454 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1455 outrel.r_addend = relocation + rel->r_addend; 1456 } 1457 else 1458 { 1459 outrel.r_addend = relocation + rel->r_addend; 1460 1461 if (r_type == R_CRIS_32) 1462 { 1463 relocate = TRUE; 1464 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); 1465 } 1466 else 1467 { 1468 long indx; 1469 1470 if (bfd_is_abs_section (sec)) 1471 indx = 0; 1472 else if (sec == NULL || sec->owner == NULL) 1473 { 1474 bfd_set_error (bfd_error_bad_value); 1475 return FALSE; 1476 } 1477 else 1478 { 1479 asection *osec; 1480 1481 /* We are turning this relocation into one 1482 against a section symbol. It would be 1483 proper to subtract the symbol's value, 1484 osec->vma, from the emitted reloc addend, 1485 but ld.so expects buggy relocs. */ 1486 osec = sec->output_section; 1487 indx = elf_section_data (osec)->dynindx; 1488 if (indx == 0) 1489 { 1490 struct elf_cris_link_hash_table *htab; 1491 htab = elf_cris_hash_table (info); 1492 osec = htab->root.text_index_section; 1493 indx = elf_section_data (osec)->dynindx; 1494 } 1495 BFD_ASSERT (indx != 0); 1496 } 1497 1498 outrel.r_info = ELF32_R_INFO (indx, r_type); 1499 } 1500 } 1501 1502 loc = sreloc->contents; 1503 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1504 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1505 1506 /* This reloc will be computed at runtime, so there's no 1507 need to do anything now, except for R_CRIS_32 relocations 1508 that have been turned into R_CRIS_RELATIVE. */ 1509 if (!relocate) 1510 continue; 1511 } 1512 1513 break; 1514 } 1515 1516 r = cris_final_link_relocate (howto, input_bfd, input_section, 1517 contents, rel, relocation); 1518 1519 if (r != bfd_reloc_ok) 1520 { 1521 const char * msg = (const char *) NULL; 1522 1523 switch (r) 1524 { 1525 case bfd_reloc_overflow: 1526 r = info->callbacks->reloc_overflow 1527 (info, (h ? &h->root : NULL), symname, howto->name, 1528 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1529 break; 1530 1531 case bfd_reloc_undefined: 1532 r = info->callbacks->undefined_symbol 1533 (info, symname, input_bfd, input_section, rel->r_offset, 1534 TRUE); 1535 break; 1536 1537 case bfd_reloc_outofrange: 1538 msg = _("internal error: out of range error"); 1539 break; 1540 1541 case bfd_reloc_notsupported: 1542 msg = _("internal error: unsupported relocation error"); 1543 break; 1544 1545 case bfd_reloc_dangerous: 1546 msg = _("internal error: dangerous relocation"); 1547 break; 1548 1549 default: 1550 msg = _("internal error: unknown error"); 1551 break; 1552 } 1553 1554 if (msg) 1555 r = info->callbacks->warning 1556 (info, msg, symname, input_bfd, input_section, rel->r_offset); 1557 1558 if (! r) 1559 return FALSE; 1560 } 1561 } 1562 1563 return TRUE; 1564} 1565 1566/* Finish up dynamic symbol handling. We set the contents of various 1567 dynamic sections here. */ 1568 1569static bfd_boolean 1570elf_cris_finish_dynamic_symbol (output_bfd, info, h, sym) 1571 bfd *output_bfd; 1572 struct bfd_link_info *info; 1573 struct elf_link_hash_entry *h; 1574 Elf_Internal_Sym *sym; 1575{ 1576 bfd *dynobj; 1577 1578 /* Where in the plt entry to put values. */ 1579 int plt_off1 = 2, plt_off2 = 10, plt_off3 = 16; 1580 1581 /* What offset to add to the distance to the first PLT entry for the 1582 value at plt_off3. */ 1583 int plt_off3_value_bias = 4; 1584 1585 /* Where in the PLT entry the call-dynlink-stub is (happens to be same 1586 for PIC and non-PIC for v32 and pre-v32). */ 1587 int plt_stub_offset = 8; 1588 int plt_entry_size = PLT_ENTRY_SIZE; 1589 const bfd_byte *plt_entry = elf_cris_plt_entry; 1590 const bfd_byte *plt_pic_entry = elf_cris_pic_plt_entry; 1591 1592 /* Adjust the various PLT entry offsets. */ 1593 if (bfd_get_mach (output_bfd) == bfd_mach_cris_v32) 1594 { 1595 plt_off2 = 14; 1596 plt_off3 = 20; 1597 plt_off3_value_bias = -2; 1598 plt_stub_offset = 12; 1599 plt_entry_size = PLT_ENTRY_SIZE_V32; 1600 plt_entry = elf_cris_plt_entry_v32; 1601 plt_pic_entry = elf_cris_pic_plt_entry_v32; 1602 } 1603 1604 dynobj = elf_hash_table (info)->dynobj; 1605 1606 if (h->plt.offset != (bfd_vma) -1) 1607 { 1608 asection *splt; 1609 asection *sgotplt; 1610 asection *sgot; 1611 asection *srela; 1612 bfd_vma got_base; 1613 1614 bfd_vma gotplt_offset 1615 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset; 1616 Elf_Internal_Rela rela; 1617 bfd_byte *loc; 1618 bfd_boolean has_gotplt = gotplt_offset != 0; 1619 1620 /* Get the index in the procedure linkage table which 1621 corresponds to this symbol. This is the index of this symbol 1622 in all the symbols for which we are making plt entries. The 1623 first entry in the procedure linkage table is reserved. */ 1624 /* We have to count backwards here, and the result is only valid as 1625 an index into .got.plt and its relocations. FIXME: Constants... */ 1626 bfd_vma gotplt_index = gotplt_offset/4 - 3; 1627 1628 /* Get the offset into the .got table of the entry that corresponds 1629 to this function. Note that we embed knowledge that "incoming" 1630 .got goes after .got.plt in the output without padding (pointer 1631 aligned). However, that knowledge is present in several other 1632 places too. */ 1633 bfd_vma got_offset 1634 = (has_gotplt 1635 ? gotplt_offset 1636 : h->got.offset + elf_cris_hash_table(info)->next_gotplt_entry); 1637 1638 /* This symbol has an entry in the procedure linkage table. Set it 1639 up. */ 1640 1641 BFD_ASSERT (h->dynindx != -1); 1642 1643 splt = bfd_get_section_by_name (dynobj, ".plt"); 1644 sgot = bfd_get_section_by_name (dynobj, ".got"); 1645 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 1646 srela = bfd_get_section_by_name (dynobj, ".rela.plt"); 1647 BFD_ASSERT (splt != NULL && sgotplt != NULL 1648 && (! has_gotplt || srela != NULL)); 1649 1650 got_base = sgotplt->output_section->vma + sgotplt->output_offset; 1651 1652 /* Fill in the entry in the procedure linkage table. */ 1653 if (! info->shared) 1654 { 1655 memcpy (splt->contents + h->plt.offset, plt_entry, 1656 plt_entry_size); 1657 1658 /* We need to enter the absolute address of the GOT entry here. */ 1659 bfd_put_32 (output_bfd, got_base + got_offset, 1660 splt->contents + h->plt.offset + plt_off1); 1661 } 1662 else 1663 { 1664 memcpy (splt->contents + h->plt.offset, plt_pic_entry, 1665 plt_entry_size); 1666 bfd_put_32 (output_bfd, got_offset, 1667 splt->contents + h->plt.offset + plt_off1); 1668 } 1669 1670 /* Fill in the plt entry and make a relocation, if this is a "real" 1671 PLT entry. */ 1672 if (has_gotplt) 1673 { 1674 /* Fill in the offset to the reloc table. */ 1675 bfd_put_32 (output_bfd, 1676 gotplt_index * sizeof (Elf32_External_Rela), 1677 splt->contents + h->plt.offset + plt_off2); 1678 1679 /* Fill in the offset to the first PLT entry, where to "jump". */ 1680 bfd_put_32 (output_bfd, 1681 - (h->plt.offset + plt_off3 + plt_off3_value_bias), 1682 splt->contents + h->plt.offset + plt_off3); 1683 1684 /* Fill in the entry in the global offset table with the address of 1685 the relocating stub. */ 1686 bfd_put_32 (output_bfd, 1687 (splt->output_section->vma 1688 + splt->output_offset 1689 + h->plt.offset 1690 + plt_stub_offset), 1691 sgotplt->contents + got_offset); 1692 1693 /* Fill in the entry in the .rela.plt section. */ 1694 rela.r_offset = (sgotplt->output_section->vma 1695 + sgotplt->output_offset 1696 + got_offset); 1697 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_JUMP_SLOT); 1698 rela.r_addend = 0; 1699 loc = srela->contents + gotplt_index * sizeof (Elf32_External_Rela); 1700 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1701 } 1702 1703 if (!h->def_regular) 1704 { 1705 /* Mark the symbol as undefined, rather than as defined in 1706 the .plt section. Leave the value alone. */ 1707 sym->st_shndx = SHN_UNDEF; 1708 1709 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't 1710 know whether resetting the value is significant; if it really 1711 is, rather than a quirk or bug in the sparc port, then I 1712 believe we'd see this elsewhere. */ 1713 /* If the symbol is weak, we do need to clear the value. 1714 Otherwise, the PLT entry would provide a definition for 1715 the symbol even if the symbol wasn't defined anywhere, 1716 and so the symbol would never be NULL. */ 1717 if (!h->ref_regular_nonweak) 1718 sym->st_value = 0; 1719 } 1720 } 1721 1722 /* For an ordinary program, we emit .got relocs only for symbols that 1723 are in the dynamic-symbols table and are either defined by the 1724 program or are undefined weak symbols, or are function symbols 1725 where we do not output a PLT: the PLT reloc was output above and all 1726 references to the function symbol are redirected to the PLT. */ 1727 if (h->got.offset != (bfd_vma) -1 1728 && (info->shared 1729 || (h->dynindx != -1 1730 && h->plt.offset == (bfd_vma) -1 1731 && !h->def_regular 1732 && h->root.type != bfd_link_hash_undefweak))) 1733 { 1734 asection *sgot; 1735 asection *srela; 1736 Elf_Internal_Rela rela; 1737 bfd_byte *loc; 1738 bfd_byte *where; 1739 1740 /* This symbol has an entry in the global offset table. Set it up. */ 1741 1742 sgot = bfd_get_section_by_name (dynobj, ".got"); 1743 srela = bfd_get_section_by_name (dynobj, ".rela.got"); 1744 BFD_ASSERT (sgot != NULL && srela != NULL); 1745 1746 rela.r_offset = (sgot->output_section->vma 1747 + sgot->output_offset 1748 + (h->got.offset &~ (bfd_vma) 1)); 1749 1750 /* If this is a static link, or it is a -Bsymbolic link and the 1751 symbol is defined locally or was forced to be local because 1752 of a version file, we just want to emit a RELATIVE reloc. 1753 The entry in the global offset table will already have been 1754 initialized in the relocate_section function. */ 1755 where = sgot->contents + (h->got.offset &~ (bfd_vma) 1); 1756 if (! elf_hash_table (info)->dynamic_sections_created 1757 || (info->shared 1758 && (info->symbolic || h->dynindx == -1) 1759 && h->def_regular)) 1760 { 1761 rela.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); 1762 rela.r_addend = bfd_get_signed_32 (output_bfd, where); 1763 } 1764 else 1765 { 1766 bfd_put_32 (output_bfd, (bfd_vma) 0, where); 1767 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_GLOB_DAT); 1768 rela.r_addend = 0; 1769 } 1770 1771 loc = srela->contents; 1772 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 1773 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1774 } 1775 1776 if (h->needs_copy) 1777 { 1778 asection *s; 1779 Elf_Internal_Rela rela; 1780 bfd_byte *loc; 1781 1782 /* This symbol needs a copy reloc. Set it up. */ 1783 1784 BFD_ASSERT (h->dynindx != -1 1785 && (h->root.type == bfd_link_hash_defined 1786 || h->root.type == bfd_link_hash_defweak)); 1787 1788 s = bfd_get_section_by_name (h->root.u.def.section->owner, 1789 ".rela.bss"); 1790 BFD_ASSERT (s != NULL); 1791 1792 rela.r_offset = (h->root.u.def.value 1793 + h->root.u.def.section->output_section->vma 1794 + h->root.u.def.section->output_offset); 1795 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_COPY); 1796 rela.r_addend = 0; 1797 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 1798 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1799 } 1800 1801 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 1802 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 1803 || h == elf_hash_table (info)->hgot) 1804 sym->st_shndx = SHN_ABS; 1805 1806 return TRUE; 1807} 1808 1809/* Finish up the dynamic sections. */ 1810 1811static bfd_boolean 1812elf_cris_finish_dynamic_sections (output_bfd, info) 1813 bfd *output_bfd; 1814 struct bfd_link_info *info; 1815{ 1816 bfd *dynobj; 1817 asection *sgot; 1818 asection *sdyn; 1819 1820 dynobj = elf_hash_table (info)->dynobj; 1821 1822 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 1823 BFD_ASSERT (sgot != NULL); 1824 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 1825 1826 if (elf_hash_table (info)->dynamic_sections_created) 1827 { 1828 asection *splt; 1829 Elf32_External_Dyn *dyncon, *dynconend; 1830 1831 splt = bfd_get_section_by_name (dynobj, ".plt"); 1832 BFD_ASSERT (splt != NULL && sdyn != NULL); 1833 1834 dyncon = (Elf32_External_Dyn *) sdyn->contents; 1835 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 1836 for (; dyncon < dynconend; dyncon++) 1837 { 1838 Elf_Internal_Dyn dyn; 1839 asection *s; 1840 1841 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 1842 1843 switch (dyn.d_tag) 1844 { 1845 default: 1846 break; 1847 1848 case DT_PLTGOT: 1849 s = bfd_get_section_by_name (output_bfd, ".got"); 1850 BFD_ASSERT (s != NULL); 1851 dyn.d_un.d_ptr = s->vma; 1852 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1853 break; 1854 1855 case DT_JMPREL: 1856 /* Yes, we *can* have a .plt and no .plt.rela, for instance 1857 if all symbols are found in the .got (not .got.plt). */ 1858 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 1859 dyn.d_un.d_ptr = s != NULL ? s->vma : 0; 1860 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1861 break; 1862 1863 case DT_PLTRELSZ: 1864 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 1865 if (s == NULL) 1866 dyn.d_un.d_val = 0; 1867 else 1868 dyn.d_un.d_val = s->size; 1869 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1870 break; 1871 1872 case DT_RELASZ: 1873 /* The procedure linkage table relocs (DT_JMPREL) should 1874 not be included in the overall relocs (DT_RELA). 1875 Therefore, we override the DT_RELASZ entry here to 1876 make it not include the JMPREL relocs. Since the 1877 linker script arranges for .rela.plt to follow all 1878 other relocation sections, we don't have to worry 1879 about changing the DT_RELA entry. */ 1880 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 1881 if (s != NULL) 1882 dyn.d_un.d_val -= s->size; 1883 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1884 break; 1885 } 1886 } 1887 1888 /* Fill in the first entry in the procedure linkage table. */ 1889 if (splt->size > 0) 1890 { 1891 if (bfd_get_mach (output_bfd) == bfd_mach_cris_v32) 1892 { 1893 if (info->shared) 1894 memcpy (splt->contents, elf_cris_pic_plt0_entry_v32, 1895 PLT_ENTRY_SIZE_V32); 1896 else 1897 { 1898 memcpy (splt->contents, elf_cris_plt0_entry_v32, 1899 PLT_ENTRY_SIZE_V32); 1900 bfd_put_32 (output_bfd, 1901 sgot->output_section->vma 1902 + sgot->output_offset + 4, 1903 splt->contents + 4); 1904 1905 elf_section_data (splt->output_section)->this_hdr.sh_entsize 1906 = PLT_ENTRY_SIZE_V32; 1907 } 1908 } 1909 else 1910 { 1911 if (info->shared) 1912 memcpy (splt->contents, elf_cris_pic_plt0_entry, 1913 PLT_ENTRY_SIZE); 1914 else 1915 { 1916 memcpy (splt->contents, elf_cris_plt0_entry, 1917 PLT_ENTRY_SIZE); 1918 bfd_put_32 (output_bfd, 1919 sgot->output_section->vma 1920 + sgot->output_offset + 4, 1921 splt->contents + 6); 1922 bfd_put_32 (output_bfd, 1923 sgot->output_section->vma 1924 + sgot->output_offset + 8, 1925 splt->contents + 14); 1926 1927 elf_section_data (splt->output_section)->this_hdr.sh_entsize 1928 = PLT_ENTRY_SIZE; 1929 } 1930 } 1931 } 1932 } 1933 1934 /* Fill in the first three entries in the global offset table. */ 1935 if (sgot->size > 0) 1936 { 1937 if (sdyn == NULL) 1938 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 1939 else 1940 bfd_put_32 (output_bfd, 1941 sdyn->output_section->vma + sdyn->output_offset, 1942 sgot->contents); 1943 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 1944 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 1945 } 1946 1947 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 1948 1949 return TRUE; 1950} 1951 1952/* Return the section that should be marked against GC for a given 1953 relocation. */ 1954 1955static asection * 1956cris_elf_gc_mark_hook (asection *sec, 1957 struct bfd_link_info *info, 1958 Elf_Internal_Rela *rel, 1959 struct elf_link_hash_entry *h, 1960 Elf_Internal_Sym *sym) 1961{ 1962 if (h != NULL) 1963 switch (ELF32_R_TYPE (rel->r_info)) 1964 { 1965 case R_CRIS_GNU_VTINHERIT: 1966 case R_CRIS_GNU_VTENTRY: 1967 return NULL; 1968 } 1969 1970 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1971} 1972 1973/* Update the got entry reference counts for the section being removed. */ 1974 1975static bfd_boolean 1976cris_elf_gc_sweep_hook (bfd *abfd, 1977 struct bfd_link_info *info, 1978 asection *sec, 1979 const Elf_Internal_Rela *relocs) 1980{ 1981 Elf_Internal_Shdr *symtab_hdr; 1982 struct elf_link_hash_entry **sym_hashes; 1983 bfd_signed_vma *local_got_refcounts; 1984 const Elf_Internal_Rela *rel, *relend; 1985 bfd *dynobj; 1986 asection *sgot; 1987 asection *srelgot; 1988 1989 dynobj = elf_hash_table (info)->dynobj; 1990 if (dynobj == NULL) 1991 return TRUE; 1992 1993 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1994 sym_hashes = elf_sym_hashes (abfd); 1995 local_got_refcounts = elf_local_got_refcounts (abfd); 1996 1997 sgot = bfd_get_section_by_name (dynobj, ".got"); 1998 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 1999 2000 relend = relocs + sec->reloc_count; 2001 for (rel = relocs; rel < relend; rel++) 2002 { 2003 unsigned long r_symndx; 2004 struct elf_link_hash_entry *h = NULL; 2005 2006 r_symndx = ELF32_R_SYM (rel->r_info); 2007 if (r_symndx >= symtab_hdr->sh_info) 2008 { 2009 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2010 while (h->root.type == bfd_link_hash_indirect 2011 || h->root.type == bfd_link_hash_warning) 2012 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2013 } 2014 2015 switch (ELF32_R_TYPE (rel->r_info)) 2016 { 2017 case R_CRIS_16_GOT: 2018 case R_CRIS_32_GOT: 2019 if (h != NULL) 2020 { 2021 if (h->got.refcount > 0) 2022 { 2023 --h->got.refcount; 2024 if (h->got.refcount == 0) 2025 { 2026 /* We don't need the .got entry any more. */ 2027 sgot->size -= 4; 2028 srelgot->size -= sizeof (Elf32_External_Rela); 2029 } 2030 } 2031 break; 2032 } 2033 2034 local_got_reloc: 2035 if (local_got_refcounts != NULL) 2036 { 2037 if (local_got_refcounts[r_symndx] > 0) 2038 { 2039 --local_got_refcounts[r_symndx]; 2040 if (local_got_refcounts[r_symndx] == 0) 2041 { 2042 /* We don't need the .got entry any more. */ 2043 sgot->size -= 4; 2044 if (info->shared) 2045 srelgot->size -= sizeof (Elf32_External_Rela); 2046 } 2047 } 2048 } 2049 break; 2050 2051 case R_CRIS_16_GOTPLT: 2052 case R_CRIS_32_GOTPLT: 2053 /* For local symbols, treat these like GOT relocs. */ 2054 if (h == NULL) 2055 goto local_got_reloc; 2056 /* Fall through. */ 2057 2058 case R_CRIS_32_PLT_GOTREL: 2059 /* FIXME: We don't garbage-collect away the .got section. */ 2060 if (local_got_refcounts != NULL) 2061 local_got_refcounts[-1]--; 2062 /* Fall through. */ 2063 2064 case R_CRIS_8_PCREL: 2065 case R_CRIS_16_PCREL: 2066 case R_CRIS_32_PCREL: 2067 case R_CRIS_32_PLT_PCREL: 2068 if (h != NULL) 2069 { 2070 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2071 && h->plt.refcount > 0) 2072 --h->plt.refcount; 2073 } 2074 break; 2075 2076 default: 2077 break; 2078 } 2079 } 2080 2081 return TRUE; 2082} 2083 2084/* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 2085 entry but we found we will not create any. Called when we find we will 2086 not have any PLT for this symbol, by for example 2087 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link, 2088 or elf_cris_size_dynamic_sections if no dynamic sections will be 2089 created (we're only linking static objects). */ 2090 2091static bfd_boolean 2092elf_cris_adjust_gotplt_to_got (h, p) 2093 struct elf_cris_link_hash_entry *h; 2094 PTR p; 2095{ 2096 struct bfd_link_info *info = (struct bfd_link_info *) p; 2097 2098 if (h->root.root.type == bfd_link_hash_warning) 2099 h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link; 2100 2101 /* If nobody wanted a GOTPLT with this symbol, we're done. */ 2102 if (h->gotplt_refcount <= 0) 2103 return TRUE; 2104 2105 if (h->root.got.refcount > 0) 2106 { 2107 /* There's a GOT entry for this symbol. Just adjust the refcount. 2108 Probably not necessary at this stage, but keeping it accurate 2109 helps avoiding surprises later. */ 2110 h->root.got.refcount += h->gotplt_refcount; 2111 h->gotplt_refcount = 0; 2112 } 2113 else 2114 { 2115 /* No GOT entry for this symbol. We need to create one. */ 2116 bfd *dynobj = elf_hash_table (info)->dynobj; 2117 asection *sgot; 2118 asection *srelgot; 2119 2120 BFD_ASSERT (dynobj != NULL); 2121 sgot = bfd_get_section_by_name (dynobj, ".got"); 2122 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 2123 2124 /* Put an accurate refcount there. */ 2125 h->root.got.refcount = h->gotplt_refcount; 2126 2127 h->gotplt_refcount = 0; 2128 2129 /* We always have a .got and a .rela.got section if there were 2130 GOTPLT relocs in input. */ 2131 BFD_ASSERT (sgot != NULL && srelgot != NULL); 2132 2133 /* Allocate space in the .got section. */ 2134 sgot->size += 4; 2135 2136 /* Allocate relocation space. */ 2137 srelgot->size += sizeof (Elf32_External_Rela); 2138 } 2139 2140 return TRUE; 2141} 2142 2143/* Try to fold PLT entries with GOT entries. There are two cases when we 2144 want to do this: 2145 2146 - When all PLT references are GOTPLT references, and there are GOT 2147 references, and this is not the executable. We don't have to 2148 generate a PLT at all. 2149 2150 - When there are both (ordinary) PLT references and GOT references, 2151 and this isn't the executable. 2152 We want to make the PLT reference use the ordinary GOT entry rather 2153 than R_CRIS_JUMP_SLOT, a run-time dynamically resolved GOTPLT entry, 2154 since the GOT entry will have to be resolved at startup anyway. 2155 2156 Though the latter case is handled when room for the PLT is allocated, 2157 not here. 2158 2159 By folding into the GOT, we may need a round-trip to a PLT in the 2160 executable for calls, a loss in performance. Still, losing a 2161 reloc is a win in size and at least in start-up time. 2162 2163 Note that this function is called before symbols are forced local by 2164 version scripts. The differing cases are handled by 2165 elf_cris_hide_symbol. */ 2166 2167static bfd_boolean 2168elf_cris_try_fold_plt_to_got (h, p) 2169 struct elf_cris_link_hash_entry *h; 2170 PTR p; 2171{ 2172 struct bfd_link_info *info = (struct bfd_link_info *) p; 2173 2174 /* If there are no GOT references for this symbol, we can't fold any 2175 other reference so there's nothing to do. Likewise if there are no 2176 PLT references; GOTPLT references included. */ 2177 if (h->root.got.refcount <= 0 || h->root.plt.refcount <= 0) 2178 return TRUE; 2179 2180 /* GOTPLT relocs are supposed to be included into the PLT refcount. */ 2181 BFD_ASSERT (h->gotplt_refcount <= h->root.plt.refcount); 2182 2183 if (h->gotplt_refcount == h->root.plt.refcount) 2184 { 2185 /* The only PLT references are GOTPLT references, and there are GOT 2186 references. Convert PLT to GOT references. */ 2187 if (! elf_cris_adjust_gotplt_to_got (h, info)) 2188 return FALSE; 2189 2190 /* Clear the PLT references, so no PLT will be created. */ 2191 h->root.plt.offset = (bfd_vma) -1; 2192 } 2193 2194 return TRUE; 2195} 2196 2197/* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc 2198 to use a GOT entry (and create one) rather than requiring a GOTPLT 2199 entry. */ 2200 2201static void 2202elf_cris_hide_symbol (info, h, force_local) 2203 struct bfd_link_info *info; 2204 struct elf_link_hash_entry *h; 2205 bfd_boolean force_local; 2206{ 2207 elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info); 2208 2209 _bfd_elf_link_hash_hide_symbol (info, h, force_local); 2210} 2211 2212/* Adjust a symbol defined by a dynamic object and referenced by a 2213 regular object. The current definition is in some section of the 2214 dynamic object, but we're not including those sections. We have to 2215 change the definition to something the rest of the link can 2216 understand. */ 2217 2218static bfd_boolean 2219elf_cris_adjust_dynamic_symbol (info, h) 2220 struct bfd_link_info *info; 2221 struct elf_link_hash_entry *h; 2222{ 2223 bfd *dynobj; 2224 asection *s; 2225 bfd_size_type plt_entry_size; 2226 2227 dynobj = elf_hash_table (info)->dynobj; 2228 2229 /* Make sure we know what is going on here. */ 2230 BFD_ASSERT (dynobj != NULL 2231 && (h->needs_plt 2232 || h->u.weakdef != NULL 2233 || (h->def_dynamic 2234 && h->ref_regular 2235 && !h->def_regular))); 2236 2237 plt_entry_size 2238 = (bfd_get_mach (dynobj) == bfd_mach_cris_v32 2239 ? PLT_ENTRY_SIZE_V32 : PLT_ENTRY_SIZE); 2240 2241 /* If this is a function, put it in the procedure linkage table. We 2242 will fill in the contents of the procedure linkage table later, 2243 when we know the address of the .got section. */ 2244 if (h->type == STT_FUNC 2245 || h->needs_plt) 2246 { 2247 /* If we link a program (not a DSO), we'll get rid of unnecessary 2248 PLT entries; we point to the actual symbols -- even for pic 2249 relocs, because a program built with -fpic should have the same 2250 result as one built without -fpic, specifically considering weak 2251 symbols. 2252 FIXME: m68k and i386 differ here, for unclear reasons. */ 2253 if (! info->shared 2254 && !h->def_dynamic) 2255 { 2256 /* This case can occur if we saw a PLT reloc in an input file, 2257 but the symbol was not defined by a dynamic object. In such 2258 a case, we don't actually need to build a procedure linkage 2259 table, and we can just do an absolute or PC reloc instead, or 2260 change a .got.plt index to a .got index for GOTPLT relocs. */ 2261 BFD_ASSERT (h->needs_plt); 2262 h->needs_plt = 0; 2263 h->plt.offset = (bfd_vma) -1; 2264 return 2265 elf_cris_adjust_gotplt_to_got ((struct 2266 elf_cris_link_hash_entry *) h, 2267 info); 2268 } 2269 2270 /* If we had a R_CRIS_GLOB_DAT that didn't have to point to a PLT; 2271 where a pointer-equivalent symbol was unimportant (i.e. more 2272 like R_CRIS_JUMP_SLOT after symbol evaluation) we could get rid 2273 of the PLT. We can't for the executable, because the GOT 2274 entries will point to the PLT there (and be constant). */ 2275 if (info->shared 2276 && !elf_cris_try_fold_plt_to_got ((struct elf_cris_link_hash_entry*) 2277 h, info)) 2278 return FALSE; 2279 2280 /* GC or folding may have rendered this entry unused. */ 2281 if (h->plt.refcount <= 0) 2282 { 2283 h->needs_plt = 0; 2284 h->plt.offset = (bfd_vma) -1; 2285 return TRUE; 2286 } 2287 2288 /* Make sure this symbol is output as a dynamic symbol. */ 2289 if (h->dynindx == -1) 2290 { 2291 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2292 return FALSE; 2293 } 2294 2295 s = bfd_get_section_by_name (dynobj, ".plt"); 2296 BFD_ASSERT (s != NULL); 2297 2298 /* If this is the first .plt entry, make room for the special 2299 first entry. */ 2300 if (s->size == 0) 2301 s->size += plt_entry_size; 2302 2303 /* If this symbol is not defined in a regular file, and we are 2304 not generating a shared library, then set the symbol to this 2305 location in the .plt. */ 2306 if (!info->shared 2307 && !h->def_regular) 2308 { 2309 h->root.u.def.section = s; 2310 h->root.u.def.value = s->size; 2311 } 2312 2313 /* If there's already a GOT entry, use that, not a .got.plt. A 2314 GOT field still has a reference count when we get here; it's 2315 not yet changed to an offset. We can't do this for an 2316 executable, because then the reloc associated with the PLT 2317 would get a non-PLT reloc pointing to the PLT. FIXME: Move 2318 this to elf_cris_try_fold_plt_to_got. */ 2319 if (info->shared && h->got.refcount > 0) 2320 { 2321 h->got.refcount += h->plt.refcount; 2322 2323 /* Mark the PLT offset to use the GOT entry by setting the low 2324 bit in the plt offset; it is always a multiple of 2325 plt_entry_size (which is at least a multiple of 2). */ 2326 BFD_ASSERT ((s->size % plt_entry_size) == 0); 2327 2328 /* Change the PLT refcount to an offset. */ 2329 h->plt.offset = s->size; 2330 2331 /* By not setting gotplt_offset (i.e. it remains at 0), we signal 2332 that the got entry should be used instead. */ 2333 BFD_ASSERT (((struct elf_cris_link_hash_entry *) 2334 h)->gotplt_offset == 0); 2335 2336 /* Make room for this entry. */ 2337 s->size += plt_entry_size; 2338 2339 return TRUE; 2340 } 2341 2342 /* No GOT reference for this symbol; prepare for an ordinary PLT. */ 2343 h->plt.offset = s->size; 2344 2345 /* Make room for this entry. */ 2346 s->size += plt_entry_size; 2347 2348 /* We also need to make an entry in the .got.plt section, which 2349 will be placed in the .got section by the linker script. */ 2350 ((struct elf_cris_link_hash_entry *) h)->gotplt_offset 2351 = elf_cris_hash_table (info)->next_gotplt_entry; 2352 elf_cris_hash_table (info)->next_gotplt_entry += 4; 2353 2354 s = bfd_get_section_by_name (dynobj, ".got.plt"); 2355 BFD_ASSERT (s != NULL); 2356 s->size += 4; 2357 2358 /* We also need to make an entry in the .rela.plt section. */ 2359 2360 s = bfd_get_section_by_name (dynobj, ".rela.plt"); 2361 BFD_ASSERT (s != NULL); 2362 s->size += sizeof (Elf32_External_Rela); 2363 2364 return TRUE; 2365 } 2366 2367 /* Reinitialize the plt offset now that it is not used as a reference 2368 count any more. */ 2369 h->plt.offset = (bfd_vma) -1; 2370 2371 /* If this is a weak symbol, and there is a real definition, the 2372 processor independent code will have arranged for us to see the 2373 real definition first, and we can just use the same value. */ 2374 if (h->u.weakdef != NULL) 2375 { 2376 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 2377 || h->u.weakdef->root.type == bfd_link_hash_defweak); 2378 h->root.u.def.section = h->u.weakdef->root.u.def.section; 2379 h->root.u.def.value = h->u.weakdef->root.u.def.value; 2380 return TRUE; 2381 } 2382 2383 /* This is a reference to a symbol defined by a dynamic object which 2384 is not a function. */ 2385 2386 /* If we are creating a shared library, we must presume that the 2387 only references to the symbol are via the global offset table. 2388 For such cases we need not do anything here; the relocations will 2389 be handled correctly by relocate_section. */ 2390 if (info->shared) 2391 return TRUE; 2392 2393 /* If there are no references to this symbol that do not use the 2394 GOT, we don't need to generate a copy reloc. */ 2395 if (!h->non_got_ref) 2396 return TRUE; 2397 2398 if (h->size == 0) 2399 { 2400 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 2401 h->root.root.string); 2402 return TRUE; 2403 } 2404 2405 /* We must allocate the symbol in our .dynbss section, which will 2406 become part of the .bss section of the executable. There will be 2407 an entry for this symbol in the .dynsym section. The dynamic 2408 object will contain position independent code, so all references 2409 from the dynamic object to this symbol will go through the global 2410 offset table. The dynamic linker will use the .dynsym entry to 2411 determine the address it must put in the global offset table, so 2412 both the dynamic object and the regular object will refer to the 2413 same memory location for the variable. */ 2414 2415 s = bfd_get_section_by_name (dynobj, ".dynbss"); 2416 BFD_ASSERT (s != NULL); 2417 2418 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to 2419 copy the initial value out of the dynamic object and into the 2420 runtime process image. We need to remember the offset into the 2421 .rela.bss section we are going to use. */ 2422 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 2423 { 2424 asection *srel; 2425 2426 srel = bfd_get_section_by_name (dynobj, ".rela.bss"); 2427 BFD_ASSERT (srel != NULL); 2428 srel->size += sizeof (Elf32_External_Rela); 2429 h->needs_copy = 1; 2430 } 2431 2432 return _bfd_elf_adjust_dynamic_copy (h, s); 2433} 2434 2435/* Look through the relocs for a section during the first phase. */ 2436 2437static bfd_boolean 2438cris_elf_check_relocs (abfd, info, sec, relocs) 2439 bfd *abfd; 2440 struct bfd_link_info *info; 2441 asection *sec; 2442 const Elf_Internal_Rela *relocs; 2443{ 2444 bfd *dynobj; 2445 Elf_Internal_Shdr *symtab_hdr; 2446 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 2447 bfd_signed_vma *local_got_refcounts; 2448 const Elf_Internal_Rela *rel; 2449 const Elf_Internal_Rela *rel_end; 2450 asection *sgot; 2451 asection *srelgot; 2452 asection *sreloc; 2453 2454 if (info->relocatable) 2455 return TRUE; 2456 2457 dynobj = elf_hash_table (info)->dynobj; 2458 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2459 sym_hashes = elf_sym_hashes (abfd); 2460 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); 2461 local_got_refcounts = elf_local_got_refcounts (abfd); 2462 2463 sgot = NULL; 2464 srelgot = NULL; 2465 sreloc = NULL; 2466 2467 if (!elf_bad_symtab (abfd)) 2468 sym_hashes_end -= symtab_hdr->sh_info; 2469 2470 rel_end = relocs + sec->reloc_count; 2471 for (rel = relocs; rel < rel_end; rel++) 2472 { 2473 struct elf_link_hash_entry *h; 2474 unsigned long r_symndx; 2475 enum elf_cris_reloc_type r_type; 2476 2477 r_symndx = ELF32_R_SYM (rel->r_info); 2478 if (r_symndx < symtab_hdr->sh_info) 2479 h = NULL; 2480 else 2481 { 2482 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2483 while (h->root.type == bfd_link_hash_indirect 2484 || h->root.type == bfd_link_hash_warning) 2485 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2486 } 2487 2488 r_type = ELF32_R_TYPE (rel->r_info); 2489 2490 /* Some relocs require linker-created sections; we need to hang them 2491 on the first input bfd we found that contained dynamic relocs. */ 2492 switch (r_type) 2493 { 2494 case R_CRIS_16_GOT: 2495 case R_CRIS_32_GOT: 2496 case R_CRIS_32_GOTREL: 2497 case R_CRIS_32_PLT_GOTREL: 2498 case R_CRIS_32_PLT_PCREL: 2499 case R_CRIS_16_GOTPLT: 2500 case R_CRIS_32_GOTPLT: 2501 if (dynobj == NULL) 2502 { 2503 elf_hash_table (info)->dynobj = dynobj = abfd; 2504 2505 /* We could handle this if we can get a handle on the 2506 output bfd in elf_cris_adjust_dynamic_symbol. Failing 2507 that, we must insist on dynobj being a specific mach. */ 2508 if (bfd_get_mach (dynobj) == bfd_mach_cris_v10_v32) 2509 { 2510 (*_bfd_error_handler) 2511 (_("%B, section %A:\n v10/v32 compatible object %s" 2512 " must not contain a PIC relocation"), 2513 abfd, sec); 2514 return FALSE; 2515 } 2516 2517 /* Create the .got section, so we can assume it's always 2518 present whenever there's a dynobj. */ 2519 if (!_bfd_elf_create_got_section (dynobj, info)) 2520 return FALSE; 2521 } 2522 break; 2523 2524 default: 2525 break; 2526 } 2527 2528 /* Some relocs require a global offset table (but perhaps not a 2529 specific GOT entry). */ 2530 switch (r_type) 2531 { 2532 /* For R_CRIS_16_GOTPLT and R_CRIS_32_GOTPLT, we need a GOT 2533 entry only for local symbols. Unfortunately, we don't know 2534 until later on if there's a version script that forces the 2535 symbol local. We must have the .rela.got section in place 2536 before we know if the symbol looks global now, so we need 2537 to treat the reloc just like for R_CRIS_16_GOT and 2538 R_CRIS_32_GOT. */ 2539 case R_CRIS_16_GOTPLT: 2540 case R_CRIS_32_GOTPLT: 2541 case R_CRIS_16_GOT: 2542 case R_CRIS_32_GOT: 2543 if (srelgot == NULL 2544 && (h != NULL || info->shared)) 2545 { 2546 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 2547 if (srelgot == NULL) 2548 { 2549 srelgot = bfd_make_section_with_flags (dynobj, 2550 ".rela.got", 2551 (SEC_ALLOC 2552 | SEC_LOAD 2553 | SEC_HAS_CONTENTS 2554 | SEC_IN_MEMORY 2555 | SEC_LINKER_CREATED 2556 | SEC_READONLY)); 2557 if (srelgot == NULL 2558 || !bfd_set_section_alignment (dynobj, srelgot, 2)) 2559 return FALSE; 2560 } 2561 } 2562 /* Fall through. */ 2563 2564 case R_CRIS_32_GOTREL: 2565 case R_CRIS_32_PLT_GOTREL: 2566 if (sgot == NULL) 2567 sgot = bfd_get_section_by_name (dynobj, ".got"); 2568 2569 if (local_got_refcounts == NULL) 2570 { 2571 bfd_size_type amt; 2572 2573 /* We use index local_got_refcounts[-1] to count all 2574 GOT-relative relocations that do not have explicit 2575 GOT entries. */ 2576 amt = symtab_hdr->sh_info + 1; 2577 amt *= sizeof (bfd_signed_vma); 2578 local_got_refcounts = ((bfd_signed_vma *) bfd_zalloc (abfd, amt)); 2579 if (local_got_refcounts == NULL) 2580 return FALSE; 2581 2582 local_got_refcounts++; 2583 elf_local_got_refcounts (abfd) = local_got_refcounts; 2584 } 2585 break; 2586 2587 default: 2588 break; 2589 } 2590 2591 switch (r_type) 2592 { 2593 case R_CRIS_16_GOTPLT: 2594 case R_CRIS_32_GOTPLT: 2595 /* Mark that we need a GOT entry if the PLT entry (and its GOT 2596 entry) is eliminated. We can only do this for a non-local 2597 symbol. */ 2598 if (h != NULL) 2599 { 2600 ((struct elf_cris_link_hash_entry *) h)->gotplt_refcount++; 2601 goto handle_gotplt_reloc; 2602 } 2603 /* If h is NULL then this is a local symbol, and we must make a 2604 GOT entry for it, so handle it like a GOT reloc. */ 2605 /* Fall through. */ 2606 2607 case R_CRIS_16_GOT: 2608 case R_CRIS_32_GOT: 2609 /* This symbol requires a global offset table entry. */ 2610 if (h != NULL) 2611 { 2612 if (h->got.refcount == 0) 2613 { 2614 /* Make sure this symbol is output as a dynamic symbol. */ 2615 if (h->dynindx == -1) 2616 { 2617 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2618 return FALSE; 2619 } 2620 2621 /* Allocate space in the .got section. */ 2622 sgot->size += 4; 2623 /* Allocate relocation space. */ 2624 srelgot->size += sizeof (Elf32_External_Rela); 2625 } 2626 h->got.refcount++; 2627 } 2628 else 2629 { 2630 /* This is a global offset table entry for a local symbol. */ 2631 if (local_got_refcounts[r_symndx] == 0) 2632 { 2633 sgot->size += 4; 2634 if (info->shared) 2635 { 2636 /* If we are generating a shared object, we need to 2637 output a R_CRIS_RELATIVE reloc so that the dynamic 2638 linker can adjust this GOT entry. */ 2639 srelgot->size += sizeof (Elf32_External_Rela); 2640 } 2641 } 2642 local_got_refcounts[r_symndx]++; 2643 } 2644 break; 2645 2646 case R_CRIS_32_GOTREL: 2647 /* This reference requires a global offset table. 2648 FIXME: The actual refcount isn't used currently; the .got 2649 section can't be removed if there were any references in the 2650 input. */ 2651 local_got_refcounts[-1]++; 2652 break; 2653 2654 handle_gotplt_reloc: 2655 2656 case R_CRIS_32_PLT_GOTREL: 2657 /* This reference requires a global offset table. */ 2658 local_got_refcounts[-1]++; 2659 /* Fall through. */ 2660 2661 case R_CRIS_32_PLT_PCREL: 2662 /* This symbol requires a procedure linkage table entry. We 2663 actually build the entry in adjust_dynamic_symbol, 2664 because this might be a case of linking PIC code which is 2665 never referenced by a dynamic object, in which case we 2666 don't need to generate a procedure linkage table entry 2667 after all. */ 2668 2669 /* Beware: if we'd check for visibility of the symbol here 2670 (and not marking the need for a PLT when non-visible), we'd 2671 get into trouble with keeping handling consistent with 2672 regards to relocs found before definition and GOTPLT 2673 handling. Eliminable PLT entries will be dealt with later 2674 anyway. */ 2675 if (h == NULL) 2676 continue; 2677 2678 h->needs_plt = 1; 2679 h->plt.refcount++; 2680 break; 2681 2682 case R_CRIS_8: 2683 case R_CRIS_16: 2684 case R_CRIS_32: 2685 /* Let's help debug shared library creation. Any of these 2686 relocs can be used in shared libs, but pages containing them 2687 cannot be shared. Don't warn for sections we don't care 2688 about, such as debug sections or non-constant sections. We 2689 can't help tables of (global) function pointers, for example, 2690 though they must be emitted in a data section to avoid having 2691 impure text sections. */ 2692 if (info->shared 2693 && (sec->flags & SEC_ALLOC) != 0 2694 && (sec->flags & SEC_READONLY) != 0) 2695 { 2696 /* FIXME: How do we make this optionally a warning only? */ 2697 (*_bfd_error_handler) 2698 (_("%B, section %A:\n relocation %s should not" 2699 " be used in a shared object; recompile with -fPIC"), 2700 abfd, 2701 sec, 2702 cris_elf_howto_table[r_type].name); 2703 } 2704 /* Fall through. */ 2705 2706 case R_CRIS_8_PCREL: 2707 case R_CRIS_16_PCREL: 2708 case R_CRIS_32_PCREL: 2709 if (h != NULL) 2710 { 2711 h->non_got_ref = 1; 2712 2713 /* Make sure a plt entry is created for this symbol if it 2714 turns out to be a function defined by a dynamic object. */ 2715 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) 2716 h->plt.refcount++; 2717 } 2718 2719 /* If we are creating a shared library and this is not a local 2720 symbol, we need to copy the reloc into the shared library. 2721 However when linking with -Bsymbolic and this is a global 2722 symbol which is defined in an object we are including in the 2723 link (i.e., DEF_REGULAR is set), then we can resolve the 2724 reloc directly. At this point we have not seen all the input 2725 files, so it is possible that DEF_REGULAR is not set now but 2726 will be set later (it is never cleared). In case of a weak 2727 definition, DEF_REGULAR may be cleared later by a strong 2728 definition in a shared library. We account for that 2729 possibility below by storing information in the relocs_copied 2730 field of the hash table entry. A similar situation occurs 2731 when creating shared libraries and symbol visibility changes 2732 render the symbol local. */ 2733 2734 /* No need to do anything if we're not creating a shared object. */ 2735 if (! info->shared) 2736 break; 2737 2738 /* We don't need to handle relocs into sections not going into 2739 the "real" output. */ 2740 if ((sec->flags & SEC_ALLOC) == 0) 2741 break; 2742 2743 /* We can only eliminate PC-relative relocs. */ 2744 if (r_type == R_CRIS_8_PCREL 2745 || r_type == R_CRIS_16_PCREL 2746 || r_type == R_CRIS_32_PCREL) 2747 { 2748 /* If the symbol is local, then we can eliminate the reloc. */ 2749 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 2750 break; 2751 2752 /* If this is with -Bsymbolic and the symbol isn't weak, and 2753 is defined by an ordinary object (the ones we include in 2754 this shared library) then we can also eliminate the 2755 reloc. See comment above for more eliminable cases which 2756 we can't identify at this time. */ 2757 if (info->symbolic 2758 && h->root.type != bfd_link_hash_defweak 2759 && h->def_regular) 2760 break; 2761 2762 if ((sec->flags & SEC_READONLY) != 0) 2763 { 2764 /* FIXME: How do we make this optionally a warning only? */ 2765 (*_bfd_error_handler) 2766 (_("%B, section %A:\n relocation %s should not be used" 2767 " in a shared object; recompile with -fPIC"), 2768 abfd, 2769 sec, 2770 cris_elf_howto_table[r_type].name); 2771 } 2772 } 2773 2774 /* We create a reloc section in dynobj and make room for this 2775 reloc. */ 2776 if (sreloc == NULL) 2777 { 2778 const char *name; 2779 2780 name = (bfd_elf_string_from_elf_section 2781 (abfd, 2782 elf_elfheader (abfd)->e_shstrndx, 2783 elf_section_data (sec)->rel_hdr.sh_name)); 2784 if (name == NULL) 2785 return FALSE; 2786 2787 BFD_ASSERT (CONST_STRNEQ (name, ".rela") 2788 && strcmp (bfd_get_section_name (abfd, sec), 2789 name + 5) == 0); 2790 2791 sreloc = bfd_get_section_by_name (dynobj, name); 2792 if (sreloc == NULL) 2793 { 2794 sreloc = bfd_make_section_with_flags (dynobj, name, 2795 (SEC_ALLOC 2796 | SEC_LOAD 2797 | SEC_HAS_CONTENTS 2798 | SEC_IN_MEMORY 2799 | SEC_LINKER_CREATED 2800 | SEC_READONLY)); 2801 if (sreloc == NULL 2802 || !bfd_set_section_alignment (dynobj, sreloc, 2)) 2803 return FALSE; 2804 } 2805 if (sec->flags & SEC_READONLY) 2806 info->flags |= DF_TEXTREL; 2807 } 2808 2809 sreloc->size += sizeof (Elf32_External_Rela); 2810 2811 /* If we are linking with -Bsymbolic, we count the number of PC 2812 relative relocations we have entered for this symbol, so that 2813 we can discard them again if the symbol is later defined by a 2814 regular object. We know that h is really a pointer to an 2815 elf_cris_link_hash_entry. */ 2816 if ((r_type == R_CRIS_8_PCREL 2817 || r_type == R_CRIS_16_PCREL 2818 || r_type == R_CRIS_32_PCREL) 2819 && info->symbolic) 2820 { 2821 struct elf_cris_link_hash_entry *eh; 2822 struct elf_cris_pcrel_relocs_copied *p; 2823 2824 eh = (struct elf_cris_link_hash_entry *) h; 2825 2826 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) 2827 if (p->section == sreloc) 2828 break; 2829 2830 if (p == NULL) 2831 { 2832 p = ((struct elf_cris_pcrel_relocs_copied *) 2833 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 2834 if (p == NULL) 2835 return FALSE; 2836 p->next = eh->pcrel_relocs_copied; 2837 eh->pcrel_relocs_copied = p; 2838 p->section = sreloc; 2839 p->count = 0; 2840 } 2841 2842 ++p->count; 2843 } 2844 break; 2845 2846 /* This relocation describes the C++ object vtable hierarchy. 2847 Reconstruct it for later use during GC. */ 2848 case R_CRIS_GNU_VTINHERIT: 2849 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2850 return FALSE; 2851 break; 2852 2853 /* This relocation describes which C++ vtable entries are actually 2854 used. Record for later use during GC. */ 2855 case R_CRIS_GNU_VTENTRY: 2856 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2857 return FALSE; 2858 break; 2859 2860 default: 2861 /* Other relocs do not appear here. */ 2862 bfd_set_error (bfd_error_bad_value); 2863 return FALSE; 2864 } 2865 } 2866 2867 return TRUE; 2868} 2869 2870/* Set the sizes of the dynamic sections. */ 2871 2872static bfd_boolean 2873elf_cris_size_dynamic_sections (output_bfd, info) 2874 bfd *output_bfd ATTRIBUTE_UNUSED; 2875 struct bfd_link_info *info; 2876{ 2877 bfd *dynobj; 2878 asection *s; 2879 bfd_boolean plt; 2880 bfd_boolean relocs; 2881 2882 dynobj = elf_hash_table (info)->dynobj; 2883 BFD_ASSERT (dynobj != NULL); 2884 2885 if (elf_hash_table (info)->dynamic_sections_created) 2886 { 2887 /* Set the contents of the .interp section to the interpreter. */ 2888 if (info->executable) 2889 { 2890 s = bfd_get_section_by_name (dynobj, ".interp"); 2891 BFD_ASSERT (s != NULL); 2892 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2893 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2894 } 2895 } 2896 else 2897 { 2898 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */ 2899 elf_cris_link_hash_traverse (elf_cris_hash_table (info), 2900 elf_cris_adjust_gotplt_to_got, 2901 (PTR) info); 2902 2903 /* We may have created entries in the .rela.got section. 2904 However, if we are not creating the dynamic sections, we will 2905 not actually use these entries. Reset the size of .rela.got, 2906 which will cause it to get stripped from the output file 2907 below. */ 2908 s = bfd_get_section_by_name (dynobj, ".rela.got"); 2909 if (s != NULL) 2910 s->size = 0; 2911 } 2912 2913 /* If this is a -Bsymbolic shared link, then we need to discard all PC 2914 relative relocs against symbols defined in a regular object. We 2915 allocated space for them in the check_relocs routine, but we will not 2916 fill them in in the relocate_section routine. We also discard space 2917 for relocs that have become for local symbols due to symbol 2918 visibility changes. For programs, we discard space for relocs for 2919 symbols not referenced by any dynamic object. */ 2920 if (info->shared) 2921 elf_cris_link_hash_traverse (elf_cris_hash_table (info), 2922 elf_cris_discard_excess_dso_dynamics, 2923 (PTR) info); 2924 else 2925 elf_cris_link_hash_traverse (elf_cris_hash_table (info), 2926 elf_cris_discard_excess_program_dynamics, 2927 (PTR) info); 2928 2929 /* The check_relocs and adjust_dynamic_symbol entry points have 2930 determined the sizes of the various dynamic sections. Allocate 2931 memory for them. */ 2932 plt = FALSE; 2933 relocs = FALSE; 2934 for (s = dynobj->sections; s != NULL; s = s->next) 2935 { 2936 const char *name; 2937 2938 if ((s->flags & SEC_LINKER_CREATED) == 0) 2939 continue; 2940 2941 /* It's OK to base decisions on the section name, because none 2942 of the dynobj section names depend upon the input files. */ 2943 name = bfd_get_section_name (dynobj, s); 2944 2945 if (strcmp (name, ".plt") == 0) 2946 { 2947 /* Remember whether there is a PLT. */ 2948 plt = s->size != 0; 2949 } 2950 else if (CONST_STRNEQ (name, ".rela")) 2951 { 2952 if (s->size != 0) 2953 { 2954 /* Remember whether there are any reloc sections other 2955 than .rela.plt. */ 2956 if (strcmp (name, ".rela.plt") != 0) 2957 relocs = TRUE; 2958 2959 /* We use the reloc_count field as a counter if we need 2960 to copy relocs into the output file. */ 2961 s->reloc_count = 0; 2962 } 2963 } 2964 else if (! CONST_STRNEQ (name, ".got") 2965 && strcmp (name, ".dynbss") != 0) 2966 { 2967 /* It's not one of our sections, so don't allocate space. */ 2968 continue; 2969 } 2970 2971 if (s->size == 0) 2972 { 2973 /* If we don't need this section, strip it from the 2974 output file. This is mostly to handle .rela.bss and 2975 .rela.plt. We must create both sections in 2976 create_dynamic_sections, because they must be created 2977 before the linker maps input sections to output 2978 sections. The linker does that before 2979 adjust_dynamic_symbol is called, and it is that 2980 function which decides whether anything needs to go 2981 into these sections. */ 2982 s->flags |= SEC_EXCLUDE; 2983 continue; 2984 } 2985 2986 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2987 continue; 2988 2989 /* Allocate memory for the section contents. We use bfd_zalloc here 2990 in case unused entries are not reclaimed before the section's 2991 contents are written out. This should not happen, but this way 2992 if it does, we will not write out garbage. For reloc sections, 2993 this will make entries have the type R_CRIS_NONE. */ 2994 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2995 if (s->contents == NULL) 2996 return FALSE; 2997 } 2998 2999 if (elf_hash_table (info)->dynamic_sections_created) 3000 { 3001 /* Add some entries to the .dynamic section. We fill in the 3002 values later, in elf_cris_finish_dynamic_sections, but we 3003 must add the entries now so that we get the correct size for 3004 the .dynamic section. The DT_DEBUG entry is filled in by the 3005 dynamic linker and used by the debugger. */ 3006#define add_dynamic_entry(TAG, VAL) \ 3007 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 3008 3009 if (!info->shared) 3010 { 3011 if (!add_dynamic_entry (DT_DEBUG, 0)) 3012 return FALSE; 3013 } 3014 3015 if (plt) 3016 { 3017 if (!add_dynamic_entry (DT_PLTGOT, 0) 3018 || !add_dynamic_entry (DT_PLTRELSZ, 0) 3019 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 3020 || !add_dynamic_entry (DT_JMPREL, 0)) 3021 return FALSE; 3022 } 3023 3024 if (relocs) 3025 { 3026 if (!add_dynamic_entry (DT_RELA, 0) 3027 || !add_dynamic_entry (DT_RELASZ, 0) 3028 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 3029 return FALSE; 3030 } 3031 3032 if ((info->flags & DF_TEXTREL) != 0) 3033 { 3034 if (!add_dynamic_entry (DT_TEXTREL, 0)) 3035 return FALSE; 3036 info->flags |= DF_TEXTREL; 3037 } 3038 } 3039#undef add_dynamic_entry 3040 3041 return TRUE; 3042} 3043 3044/* This function is called via elf_cris_link_hash_traverse if we are 3045 creating a shared object. In the -Bsymbolic case, it discards the 3046 space allocated to copy PC relative relocs against symbols which 3047 are defined in regular objects. For the normal non-symbolic case, 3048 we also discard space for relocs that have become local due to 3049 symbol visibility changes. We allocated space for them in the 3050 check_relocs routine, but we won't fill them in in the 3051 relocate_section routine. */ 3052 3053static bfd_boolean 3054elf_cris_discard_excess_dso_dynamics (h, inf) 3055 struct elf_cris_link_hash_entry *h; 3056 PTR inf; 3057{ 3058 struct elf_cris_pcrel_relocs_copied *s; 3059 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3060 3061 if (h->root.root.type == bfd_link_hash_warning) 3062 h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link; 3063 3064 /* If a symbol has been forced local or we have found a regular 3065 definition for the symbolic link case, then we won't be needing 3066 any relocs. */ 3067 if (h->root.def_regular 3068 && (h->root.forced_local 3069 || info->symbolic)) 3070 { 3071 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) 3072 s->section->size -= s->count * sizeof (Elf32_External_Rela); 3073 } 3074 3075 return TRUE; 3076} 3077 3078/* This function is called via elf_cris_link_hash_traverse if we are *not* 3079 creating a shared object. We discard space for relocs for symbols put 3080 in the .got, but which we found we do not have to resolve at run-time. */ 3081 3082static bfd_boolean 3083elf_cris_discard_excess_program_dynamics (h, inf) 3084 struct elf_cris_link_hash_entry *h; 3085 PTR inf; 3086{ 3087 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3088 3089 if (h->root.root.type == bfd_link_hash_warning) 3090 h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link; 3091 3092 /* If we're not creating a shared library and have a symbol which is 3093 referred to by .got references, but the symbol is defined locally, 3094 (or rather, not defined by a DSO) then lose the reloc for the .got 3095 (don't allocate room for it). Likewise for relocs for something 3096 for which we create a PLT. */ 3097 if (!h->root.def_dynamic 3098 || h->root.plt.refcount > 0) 3099 { 3100 if (h->root.got.refcount > 0 3101 /* The size of this section is only valid and in sync with the 3102 various reference counts if we do dynamic; don't decrement it 3103 otherwise. */ 3104 && elf_hash_table (info)->dynamic_sections_created) 3105 { 3106 bfd *dynobj = elf_hash_table (info)->dynobj; 3107 asection *srelgot; 3108 3109 BFD_ASSERT (dynobj != NULL); 3110 3111 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 3112 3113 BFD_ASSERT (srelgot != NULL); 3114 3115 srelgot->size -= sizeof (Elf32_External_Rela); 3116 } 3117 3118 /* If the locally-defined symbol isn't used by a DSO, then we don't 3119 have to export it as a dynamic symbol. This was already done for 3120 functions; doing this for all symbols would presumably not 3121 introduce new problems. Of course we don't do this if we're 3122 exporting all dynamic symbols. */ 3123 if (! info->export_dynamic 3124 && h->root.dynindx != -1 3125 && !h->root.def_dynamic 3126 && !h->root.ref_dynamic) 3127 { 3128 h->root.dynindx = -1; 3129 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, 3130 h->root.dynstr_index); 3131 } 3132 } 3133 3134 return TRUE; 3135} 3136 3137/* Reject a file depending on presence and expectation of prefixed 3138 underscores on symbols. */ 3139 3140static bfd_boolean 3141cris_elf_object_p (abfd) 3142 bfd *abfd; 3143{ 3144 if (! cris_elf_set_mach_from_flags (abfd, elf_elfheader (abfd)->e_flags)) 3145 return FALSE; 3146 3147 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)) 3148 return (bfd_get_symbol_leading_char (abfd) == '_'); 3149 else 3150 return (bfd_get_symbol_leading_char (abfd) == 0); 3151} 3152 3153/* Mark presence or absence of leading underscore. Set machine type 3154 flags from mach type. */ 3155 3156static void 3157cris_elf_final_write_processing (abfd, linker) 3158 bfd *abfd; 3159 bfd_boolean linker ATTRIBUTE_UNUSED; 3160{ 3161 unsigned long e_flags = elf_elfheader (abfd)->e_flags; 3162 3163 e_flags &= ~EF_CRIS_UNDERSCORE; 3164 if (bfd_get_symbol_leading_char (abfd) == '_') 3165 e_flags |= EF_CRIS_UNDERSCORE; 3166 3167 switch (bfd_get_mach (abfd)) 3168 { 3169 case bfd_mach_cris_v0_v10: 3170 e_flags |= EF_CRIS_VARIANT_ANY_V0_V10; 3171 break; 3172 3173 case bfd_mach_cris_v10_v32: 3174 e_flags |= EF_CRIS_VARIANT_COMMON_V10_V32; 3175 break; 3176 3177 case bfd_mach_cris_v32: 3178 e_flags |= EF_CRIS_VARIANT_V32; 3179 break; 3180 3181 default: 3182 _bfd_abort (__FILE__, __LINE__, 3183 _("Unexpected machine number")); 3184 } 3185 3186 elf_elfheader (abfd)->e_flags = e_flags; 3187} 3188 3189/* Set the mach type from e_flags value. */ 3190 3191static bfd_boolean 3192cris_elf_set_mach_from_flags (abfd, flags) 3193 bfd *abfd; 3194 unsigned long flags; 3195{ 3196 switch (flags & EF_CRIS_VARIANT_MASK) 3197 { 3198 case EF_CRIS_VARIANT_ANY_V0_V10: 3199 bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v0_v10); 3200 break; 3201 3202 case EF_CRIS_VARIANT_V32: 3203 bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v32); 3204 break; 3205 3206 case EF_CRIS_VARIANT_COMMON_V10_V32: 3207 bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v10_v32); 3208 break; 3209 3210 default: 3211 /* Since we don't recognize them, we obviously can't support them 3212 with this code; we'd have to require that all future handling 3213 would be optional. */ 3214 bfd_set_error (bfd_error_wrong_format); 3215 return FALSE; 3216 } 3217 3218 return TRUE; 3219} 3220 3221/* Display the flags field. */ 3222 3223static bfd_boolean 3224cris_elf_print_private_bfd_data (abfd, ptr) 3225 bfd *abfd; 3226 PTR ptr; 3227{ 3228 FILE *file = (FILE *) ptr; 3229 3230 BFD_ASSERT (abfd != NULL && ptr != NULL); 3231 3232 _bfd_elf_print_private_bfd_data (abfd, ptr); 3233 3234 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 3235 3236 if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE) 3237 fprintf (file, _(" [symbols have a _ prefix]")); 3238 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_VARIANT_MASK) 3239 == EF_CRIS_VARIANT_COMMON_V10_V32) 3240 fprintf (file, _(" [v10 and v32]")); 3241 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_VARIANT_MASK) 3242 == EF_CRIS_VARIANT_V32) 3243 fprintf (file, _(" [v32]")); 3244 3245 fputc ('\n', file); 3246 return TRUE; 3247} 3248 3249/* Don't mix files with and without a leading underscore. */ 3250 3251static bfd_boolean 3252cris_elf_merge_private_bfd_data (ibfd, obfd) 3253 bfd *ibfd; 3254 bfd *obfd; 3255{ 3256 int imach, omach; 3257 3258 if (! _bfd_generic_verify_endian_match (ibfd, obfd)) 3259 return FALSE; 3260 3261 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 3262 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 3263 return TRUE; 3264 3265 imach = bfd_get_mach (ibfd); 3266 3267 if (! elf_flags_init (obfd)) 3268 { 3269 /* This happens when ld starts out with a 'blank' output file. */ 3270 elf_flags_init (obfd) = TRUE; 3271 3272 /* We ignore the linker-set mach, and instead set it according to 3273 the first input file. This would also happen if we could 3274 somehow filter out the OUTPUT_ARCH () setting from elf.sc. 3275 This allows us to keep the same linker config across 3276 cris(v0..v10) and crisv32. The drawback is that we can't force 3277 the output type, which might be a sane thing to do for a 3278 v10+v32 compatibility object. */ 3279 if (! bfd_set_arch_mach (obfd, bfd_arch_cris, imach)) 3280 return FALSE; 3281 } 3282 3283 if (bfd_get_symbol_leading_char (ibfd) 3284 != bfd_get_symbol_leading_char (obfd)) 3285 { 3286 (*_bfd_error_handler) 3287 (bfd_get_symbol_leading_char (ibfd) == '_' 3288 ? _("%B: uses _-prefixed symbols, but writing file with non-prefixed symbols") 3289 : _("%B: uses non-prefixed symbols, but writing file with _-prefixed symbols"), 3290 ibfd); 3291 bfd_set_error (bfd_error_bad_value); 3292 return FALSE; 3293 } 3294 3295 omach = bfd_get_mach (obfd); 3296 3297 if (imach != omach) 3298 { 3299 /* We can get an incompatible combination only if either is 3300 bfd_mach_cris_v32, and the other one isn't compatible. */ 3301 if ((imach == bfd_mach_cris_v32 3302 && omach != bfd_mach_cris_v10_v32) 3303 || (omach == bfd_mach_cris_v32 3304 && imach != bfd_mach_cris_v10_v32)) 3305 { 3306 (*_bfd_error_handler) 3307 ((imach == bfd_mach_cris_v32) 3308 ? _("%B contains CRIS v32 code, incompatible" 3309 " with previous objects") 3310 : _("%B contains non-CRIS-v32 code, incompatible" 3311 " with previous objects"), 3312 ibfd); 3313 bfd_set_error (bfd_error_bad_value); 3314 return FALSE; 3315 } 3316 3317 /* We don't have to check the case where the input is compatible 3318 with v10 and v32, because the output is already known to be set 3319 to the other (compatible) mach. */ 3320 if (omach == bfd_mach_cris_v10_v32 3321 && ! bfd_set_arch_mach (obfd, bfd_arch_cris, imach)) 3322 return FALSE; 3323 } 3324 3325 return TRUE; 3326} 3327 3328/* Do side-effects of e_flags copying to obfd. */ 3329 3330static bfd_boolean 3331cris_elf_copy_private_bfd_data (ibfd, obfd) 3332 bfd *ibfd; 3333 bfd *obfd; 3334{ 3335 /* Call the base function. */ 3336 if (!_bfd_elf_copy_private_bfd_data (ibfd, obfd)) 3337 return FALSE; 3338 3339 /* If output is big-endian for some obscure reason, stop here. */ 3340 if (_bfd_generic_verify_endian_match (ibfd, obfd) == FALSE) 3341 return FALSE; 3342 3343 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 3344 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 3345 return TRUE; 3346 3347 /* Do what we really came here for. */ 3348 return bfd_set_arch_mach (obfd, bfd_arch_cris, bfd_get_mach (ibfd)); 3349} 3350 3351static enum elf_reloc_type_class 3352elf_cris_reloc_type_class (rela) 3353 const Elf_Internal_Rela *rela; 3354{ 3355 switch ((int) ELF32_R_TYPE (rela->r_info)) 3356 { 3357 case R_CRIS_RELATIVE: 3358 return reloc_class_relative; 3359 case R_CRIS_JUMP_SLOT: 3360 return reloc_class_plt; 3361 case R_CRIS_COPY: 3362 return reloc_class_copy; 3363 default: 3364 return reloc_class_normal; 3365 } 3366} 3367 3368#define ELF_ARCH bfd_arch_cris 3369#define ELF_MACHINE_CODE EM_CRIS 3370#define ELF_MAXPAGESIZE 0x2000 3371 3372#define TARGET_LITTLE_SYM bfd_elf32_cris_vec 3373#define TARGET_LITTLE_NAME "elf32-cris" 3374#define elf_symbol_leading_char 0 3375 3376#define elf_info_to_howto_rel NULL 3377#define elf_info_to_howto cris_info_to_howto_rela 3378#define elf_backend_relocate_section cris_elf_relocate_section 3379#define elf_backend_gc_mark_hook cris_elf_gc_mark_hook 3380#define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook 3381#define elf_backend_check_relocs cris_elf_check_relocs 3382#define elf_backend_grok_prstatus cris_elf_grok_prstatus 3383#define elf_backend_grok_psinfo cris_elf_grok_psinfo 3384 3385#define elf_backend_can_gc_sections 1 3386#define elf_backend_can_refcount 1 3387 3388#define elf_backend_object_p cris_elf_object_p 3389#define elf_backend_final_write_processing \ 3390 cris_elf_final_write_processing 3391#define bfd_elf32_bfd_print_private_bfd_data \ 3392 cris_elf_print_private_bfd_data 3393#define bfd_elf32_bfd_merge_private_bfd_data \ 3394 cris_elf_merge_private_bfd_data 3395#define bfd_elf32_bfd_copy_private_bfd_data \ 3396 cris_elf_copy_private_bfd_data 3397 3398#define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup 3399#define bfd_elf32_bfd_reloc_name_lookup cris_reloc_name_lookup 3400 3401#define bfd_elf32_bfd_link_hash_table_create \ 3402 elf_cris_link_hash_table_create 3403#define elf_backend_adjust_dynamic_symbol \ 3404 elf_cris_adjust_dynamic_symbol 3405#define elf_backend_size_dynamic_sections \ 3406 elf_cris_size_dynamic_sections 3407#define elf_backend_init_index_section _bfd_elf_init_1_index_section 3408#define elf_backend_finish_dynamic_symbol \ 3409 elf_cris_finish_dynamic_symbol 3410#define elf_backend_finish_dynamic_sections \ 3411 elf_cris_finish_dynamic_sections 3412#define elf_backend_create_dynamic_sections \ 3413 _bfd_elf_create_dynamic_sections 3414#define bfd_elf32_bfd_final_link \ 3415 bfd_elf_gc_common_final_link 3416#define elf_backend_hide_symbol elf_cris_hide_symbol 3417#define elf_backend_reloc_type_class elf_cris_reloc_type_class 3418 3419#define elf_backend_want_got_plt 1 3420#define elf_backend_plt_readonly 1 3421#define elf_backend_want_plt_sym 0 3422#define elf_backend_got_header_size 12 3423 3424/* Later, we my want to optimize RELA entries into REL entries for dynamic 3425 linking and libraries (if it's a win of any significance). Until then, 3426 take the easy route. */ 3427#define elf_backend_may_use_rel_p 0 3428#define elf_backend_may_use_rela_p 1 3429#define elf_backend_rela_normal 1 3430 3431#include "elf32-target.h" 3432 3433#undef TARGET_LITTLE_SYM 3434#undef TARGET_LITTLE_NAME 3435#undef elf_symbol_leading_char 3436 3437#define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec 3438#define TARGET_LITTLE_NAME "elf32-us-cris" 3439#define elf_symbol_leading_char '_' 3440#undef elf32_bed 3441#define elf32_bed elf32_us_cris_bed 3442 3443#include "elf32-target.h" 3444