1/* CRIS-specific support for 32-bit ELF. 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006 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 2 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, MA 02110-1301, USA. */ 23 24#include "bfd.h" 25#include "sysdep.h" 26#include "libbfd.h" 27#include "elf-bfd.h" 28#include "elf/cris.h" 29 30/* Forward declarations. */ 31static reloc_howto_type * cris_reloc_type_lookup 32 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); 33 34static void cris_info_to_howto_rela 35 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 36 37static bfd_reloc_status_type cris_elf_pcrel_reloc 38 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 39 40static bfd_boolean cris_elf_grok_prstatus 41 PARAMS ((bfd *abfd, Elf_Internal_Note *note)); 42 43static bfd_boolean cris_elf_grok_psinfo 44 PARAMS ((bfd *abfd, Elf_Internal_Note *note)); 45 46static bfd_boolean cris_elf_relocate_section 47 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 48 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 49 50static bfd_reloc_status_type cris_final_link_relocate 51 PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, 52 Elf_Internal_Rela *, bfd_vma)); 53 54static bfd_boolean cris_elf_object_p PARAMS ((bfd *)); 55 56static void cris_elf_final_write_processing PARAMS ((bfd *, bfd_boolean)); 57 58static bfd_boolean cris_elf_set_mach_from_flags 59 PARAMS ((bfd *, unsigned long int)); 60 61static bfd_boolean cris_elf_print_private_bfd_data PARAMS ((bfd *, PTR)); 62 63static bfd_boolean cris_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *)); 64static bfd_boolean cris_elf_copy_private_bfd_data PARAMS ((bfd *, bfd *)); 65 66struct elf_cris_link_hash_entry; 67static bfd_boolean elf_cris_discard_excess_dso_dynamics 68 PARAMS ((struct elf_cris_link_hash_entry *, PTR)); 69static bfd_boolean elf_cris_discard_excess_program_dynamics 70 PARAMS ((struct elf_cris_link_hash_entry *, PTR)); 71static bfd_boolean elf_cris_adjust_gotplt_to_got 72 PARAMS ((struct elf_cris_link_hash_entry *, PTR)); 73static bfd_boolean elf_cris_try_fold_plt_to_got 74 PARAMS ((struct elf_cris_link_hash_entry *, PTR)); 75static struct bfd_hash_entry *elf_cris_link_hash_newfunc 76 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); 77static struct bfd_link_hash_table *elf_cris_link_hash_table_create 78 PARAMS ((bfd *)); 79static bfd_boolean elf_cris_adjust_dynamic_symbol 80 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); 81static bfd_boolean cris_elf_check_relocs 82 PARAMS ((bfd *, struct bfd_link_info *, asection *, 83 const Elf_Internal_Rela *)); 84 85static bfd_boolean elf_cris_size_dynamic_sections 86 PARAMS ((bfd *, struct bfd_link_info *)); 87static bfd_boolean elf_cris_finish_dynamic_symbol 88 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, 89 Elf_Internal_Sym *)); 90static bfd_boolean elf_cris_finish_dynamic_sections 91 PARAMS ((bfd *, struct bfd_link_info *)); 92static void elf_cris_hide_symbol 93 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean)); 94static enum elf_reloc_type_class elf_cris_reloc_type_class 95 PARAMS ((const Elf_Internal_Rela *)); 96 97static reloc_howto_type cris_elf_howto_table [] = 98{ 99 /* This reloc does nothing. */ 100 HOWTO (R_CRIS_NONE, /* type */ 101 0, /* rightshift */ 102 2, /* size (0 = byte, 1 = short, 2 = long) */ 103 32, /* bitsize */ 104 FALSE, /* pc_relative */ 105 0, /* bitpos */ 106 complain_overflow_bitfield, /* complain_on_overflow */ 107 bfd_elf_generic_reloc, /* special_function */ 108 "R_CRIS_NONE", /* name */ 109 FALSE, /* partial_inplace */ 110 0, /* src_mask */ 111 0, /* dst_mask */ 112 FALSE), /* pcrel_offset */ 113 114 /* An 8 bit absolute relocation. */ 115 HOWTO (R_CRIS_8, /* type */ 116 0, /* rightshift */ 117 0, /* size (0 = byte, 1 = short, 2 = long) */ 118 8, /* bitsize */ 119 FALSE, /* pc_relative */ 120 0, /* bitpos */ 121 complain_overflow_bitfield, /* complain_on_overflow */ 122 bfd_elf_generic_reloc, /* special_function */ 123 "R_CRIS_8", /* name */ 124 FALSE, /* partial_inplace */ 125 0x0000, /* src_mask */ 126 0x00ff, /* dst_mask */ 127 FALSE), /* pcrel_offset */ 128 129 /* A 16 bit absolute relocation. */ 130 HOWTO (R_CRIS_16, /* type */ 131 0, /* rightshift */ 132 1, /* size (0 = byte, 1 = short, 2 = long) */ 133 16, /* bitsize */ 134 FALSE, /* pc_relative */ 135 0, /* bitpos */ 136 complain_overflow_bitfield, /* complain_on_overflow */ 137 bfd_elf_generic_reloc, /* special_function */ 138 "R_CRIS_16", /* name */ 139 FALSE, /* partial_inplace */ 140 0x00000000, /* src_mask */ 141 0x0000ffff, /* dst_mask */ 142 FALSE), /* pcrel_offset */ 143 144 /* A 32 bit absolute relocation. */ 145 HOWTO (R_CRIS_32, /* type */ 146 0, /* rightshift */ 147 2, /* size (0 = byte, 1 = short, 2 = long) */ 148 32, /* bitsize */ 149 FALSE, /* pc_relative */ 150 0, /* bitpos */ 151 /* We don't want overflow complaints for 64-bit vma builds 152 for e.g. sym+0x40000000 (or actually sym-0xc0000000 in 153 32-bit ELF) where sym=0xc0001234. 154 Don't do this for the PIC relocs, as we don't expect to 155 see them with large offsets. */ 156 complain_overflow_dont, /* complain_on_overflow */ 157 bfd_elf_generic_reloc, /* special_function */ 158 "R_CRIS_32", /* name */ 159 FALSE, /* partial_inplace */ 160 0x00000000, /* src_mask */ 161 0xffffffff, /* dst_mask */ 162 FALSE), /* pcrel_offset */ 163 164 /* An 8 bit PC-relative relocation. */ 165 HOWTO (R_CRIS_8_PCREL, /* type */ 166 0, /* rightshift */ 167 0, /* size (0 = byte, 1 = short, 2 = long) */ 168 8, /* bitsize */ 169 TRUE, /* pc_relative */ 170 0, /* bitpos */ 171 complain_overflow_bitfield, /* complain_on_overflow */ 172 cris_elf_pcrel_reloc, /* special_function */ 173 "R_CRIS_8_PCREL", /* name */ 174 FALSE, /* partial_inplace */ 175 0x0000, /* src_mask */ 176 0x00ff, /* dst_mask */ 177 TRUE), /* pcrel_offset */ 178 179 /* A 16 bit PC-relative relocation. */ 180 HOWTO (R_CRIS_16_PCREL, /* type */ 181 0, /* rightshift */ 182 1, /* size (0 = byte, 1 = short, 2 = long) */ 183 16, /* bitsize */ 184 TRUE, /* pc_relative */ 185 0, /* bitpos */ 186 complain_overflow_bitfield, /* complain_on_overflow */ 187 cris_elf_pcrel_reloc, /* special_function */ 188 "R_CRIS_16_PCREL", /* name */ 189 FALSE, /* partial_inplace */ 190 0x00000000, /* src_mask */ 191 0x0000ffff, /* dst_mask */ 192 TRUE), /* pcrel_offset */ 193 194 /* A 32 bit PC-relative relocation. */ 195 HOWTO (R_CRIS_32_PCREL, /* type */ 196 0, /* rightshift */ 197 2, /* size (0 = byte, 1 = short, 2 = long) */ 198 32, /* bitsize */ 199 TRUE, /* pc_relative */ 200 0, /* bitpos */ 201 complain_overflow_bitfield, /* complain_on_overflow */ 202 cris_elf_pcrel_reloc, /* special_function */ 203 "R_CRIS_32_PCREL", /* name */ 204 FALSE, /* partial_inplace */ 205 0x00000000, /* src_mask */ 206 0xffffffff, /* dst_mask */ 207 TRUE), /* pcrel_offset */ 208 209 /* GNU extension to record C++ vtable hierarchy. */ 210 HOWTO (R_CRIS_GNU_VTINHERIT, /* type */ 211 0, /* rightshift */ 212 2, /* size (0 = byte, 1 = short, 2 = long) */ 213 0, /* bitsize */ 214 FALSE, /* pc_relative */ 215 0, /* bitpos */ 216 complain_overflow_dont, /* complain_on_overflow */ 217 NULL, /* special_function */ 218 "R_CRIS_GNU_VTINHERIT", /* name */ 219 FALSE, /* partial_inplace */ 220 0, /* src_mask */ 221 0, /* dst_mask */ 222 FALSE), /* pcrel_offset */ 223 224 /* GNU extension to record C++ vtable member usage. */ 225 HOWTO (R_CRIS_GNU_VTENTRY, /* type */ 226 0, /* rightshift */ 227 2, /* size (0 = byte, 1 = short, 2 = long) */ 228 0, /* bitsize */ 229 FALSE, /* pc_relative */ 230 0, /* bitpos */ 231 complain_overflow_dont, /* complain_on_overflow */ 232 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 233 "R_CRIS_GNU_VTENTRY", /* name */ 234 FALSE, /* partial_inplace */ 235 0, /* src_mask */ 236 0, /* dst_mask */ 237 FALSE), /* pcrel_offset */ 238 239 /* This is used only by the dynamic linker. The symbol should exist 240 both in the object being run and in some shared library. The 241 dynamic linker copies the data addressed by the symbol from the 242 shared library into the object, because the object being 243 run has to have the data at some particular address. */ 244 HOWTO (R_CRIS_COPY, /* type */ 245 0, /* rightshift */ 246 2, /* size (0 = byte, 1 = short, 2 = long) */ 247 32, /* bitsize */ 248 FALSE, /* pc_relative */ 249 0, /* bitpos */ 250 complain_overflow_bitfield, /* complain_on_overflow */ 251 bfd_elf_generic_reloc, /* special_function */ 252 "R_CRIS_COPY", /* name */ 253 FALSE, /* partial_inplace */ 254 0, /* src_mask */ 255 0, /* dst_mask */ 256 FALSE), /* pcrel_offset */ 257 258 /* Like R_CRIS_32, but used when setting global offset table entries. */ 259 HOWTO (R_CRIS_GLOB_DAT, /* type */ 260 0, /* rightshift */ 261 2, /* size (0 = byte, 1 = short, 2 = long) */ 262 32, /* bitsize */ 263 FALSE, /* pc_relative */ 264 0, /* bitpos */ 265 complain_overflow_bitfield, /* complain_on_overflow */ 266 bfd_elf_generic_reloc, /* special_function */ 267 "R_CRIS_GLOB_DAT", /* name */ 268 FALSE, /* partial_inplace */ 269 0, /* src_mask */ 270 0xffffffff, /* dst_mask */ 271 FALSE), /* pcrel_offset */ 272 273 /* Marks a procedure linkage table entry for a symbol. */ 274 HOWTO (R_CRIS_JUMP_SLOT, /* type */ 275 0, /* rightshift */ 276 2, /* size (0 = byte, 1 = short, 2 = long) */ 277 32, /* bitsize */ 278 FALSE, /* pc_relative */ 279 0, /* bitpos */ 280 complain_overflow_bitfield, /* complain_on_overflow */ 281 bfd_elf_generic_reloc, /* special_function */ 282 "R_CRIS_JUMP_SLOT", /* name */ 283 FALSE, /* partial_inplace */ 284 0, /* src_mask */ 285 0, /* dst_mask */ 286 FALSE), /* pcrel_offset */ 287 288 /* Used only by the dynamic linker. When the object is run, this 289 longword is set to the load address of the object, plus the 290 addend. */ 291 HOWTO (R_CRIS_RELATIVE, /* type */ 292 0, /* rightshift */ 293 2, /* size (0 = byte, 1 = short, 2 = long) */ 294 32, /* bitsize */ 295 FALSE, /* pc_relative */ 296 0, /* bitpos */ 297 complain_overflow_bitfield, /* complain_on_overflow */ 298 bfd_elf_generic_reloc, /* special_function */ 299 "R_CRIS_RELATIVE", /* name */ 300 FALSE, /* partial_inplace */ 301 0, /* src_mask */ 302 0xffffffff, /* dst_mask */ 303 FALSE), /* pcrel_offset */ 304 305 /* Like R_CRIS_32, but referring to the GOT table entry for the symbol. */ 306 HOWTO (R_CRIS_16_GOT, /* type */ 307 0, /* rightshift */ 308 1, /* size (0 = byte, 1 = short, 2 = long) */ 309 16, /* bitsize */ 310 FALSE, /* pc_relative */ 311 0, /* bitpos */ 312 complain_overflow_bitfield, /* complain_on_overflow */ 313 bfd_elf_generic_reloc, /* special_function */ 314 "R_CRIS_16_GOT", /* name */ 315 FALSE, /* partial_inplace */ 316 0, /* src_mask */ 317 0xffff, /* dst_mask */ 318 FALSE), /* pcrel_offset */ 319 320 HOWTO (R_CRIS_32_GOT, /* type */ 321 0, /* rightshift */ 322 2, /* size (0 = byte, 1 = short, 2 = long) */ 323 32, /* bitsize */ 324 FALSE, /* pc_relative */ 325 0, /* bitpos */ 326 complain_overflow_bitfield, /* complain_on_overflow */ 327 bfd_elf_generic_reloc, /* special_function */ 328 "R_CRIS_32_GOT", /* name */ 329 FALSE, /* partial_inplace */ 330 0, /* src_mask */ 331 0xffffffff, /* dst_mask */ 332 FALSE), /* pcrel_offset */ 333 334 /* Like R_CRIS_32_GOT, but referring to (and requesting a) PLT part of 335 the GOT table for the symbol. */ 336 HOWTO (R_CRIS_16_GOTPLT, /* type */ 337 0, /* rightshift */ 338 1, /* size (0 = byte, 1 = short, 2 = long) */ 339 16, /* bitsize */ 340 FALSE, /* pc_relative */ 341 0, /* bitpos */ 342 complain_overflow_bitfield, /* complain_on_overflow */ 343 bfd_elf_generic_reloc, /* special_function */ 344 "R_CRIS_16_GOTPLT", /* name */ 345 FALSE, /* partial_inplace */ 346 0, /* src_mask */ 347 0xffff, /* dst_mask */ 348 FALSE), /* pcrel_offset */ 349 350 HOWTO (R_CRIS_32_GOTPLT, /* type */ 351 0, /* rightshift */ 352 2, /* size (0 = byte, 1 = short, 2 = long) */ 353 32, /* bitsize */ 354 FALSE, /* pc_relative */ 355 0, /* bitpos */ 356 complain_overflow_bitfield, /* complain_on_overflow */ 357 bfd_elf_generic_reloc, /* special_function */ 358 "R_CRIS_32_GOTPLT", /* name */ 359 FALSE, /* partial_inplace */ 360 0, /* src_mask */ 361 0xffffffff, /* dst_mask */ 362 FALSE), /* pcrel_offset */ 363 364 /* A 32-bit offset from GOT to (local const) symbol: no GOT entry should 365 be necessary. */ 366 HOWTO (R_CRIS_32_GOTREL, /* type */ 367 0, /* rightshift */ 368 2, /* size (0 = byte, 1 = short, 2 = long) */ 369 32, /* bitsize */ 370 FALSE, /* pc_relative */ 371 0, /* bitpos */ 372 complain_overflow_bitfield, /* complain_on_overflow */ 373 bfd_elf_generic_reloc, /* special_function */ 374 "R_CRIS_32_GOTREL", /* name */ 375 FALSE, /* partial_inplace */ 376 0, /* src_mask */ 377 0xffffffff, /* dst_mask */ 378 FALSE), /* pcrel_offset */ 379 380 /* A 32-bit offset from GOT to entry for this symbol in PLT and request 381 to create PLT entry for symbol. */ 382 HOWTO (R_CRIS_32_PLT_GOTREL, /* type */ 383 0, /* rightshift */ 384 2, /* size (0 = byte, 1 = short, 2 = long) */ 385 32, /* bitsize */ 386 FALSE, /* pc_relative */ 387 0, /* bitpos */ 388 complain_overflow_bitfield, /* complain_on_overflow */ 389 bfd_elf_generic_reloc, /* special_function */ 390 "R_CRIS_32_PLT_GOTREL", /* name */ 391 FALSE, /* partial_inplace */ 392 0, /* src_mask */ 393 0xffffffff, /* dst_mask */ 394 FALSE), /* pcrel_offset */ 395 396 /* A 32-bit offset from PC (location after the relocation) + addend to 397 entry for this symbol in PLT and request to create PLT entry for 398 symbol. */ 399 HOWTO (R_CRIS_32_PLT_PCREL, /* type */ 400 0, /* rightshift */ 401 2, /* size (0 = byte, 1 = short, 2 = long) */ 402 32, /* bitsize */ 403 TRUE, /* pc_relative */ 404 0, /* bitpos */ 405 complain_overflow_bitfield, /* complain_on_overflow */ 406 cris_elf_pcrel_reloc, /* special_function */ 407 "R_CRIS_32_PLT_PCREL", /* name */ 408 FALSE, /* partial_inplace */ 409 0, /* src_mask */ 410 0xffffffff, /* dst_mask */ 411 TRUE) /* pcrel_offset */ 412}; 413 414/* Map BFD reloc types to CRIS ELF reloc types. */ 415 416struct cris_reloc_map 417{ 418 bfd_reloc_code_real_type bfd_reloc_val; 419 unsigned int cris_reloc_val; 420}; 421 422static const struct cris_reloc_map cris_reloc_map [] = 423{ 424 { BFD_RELOC_NONE, R_CRIS_NONE }, 425 { BFD_RELOC_8, R_CRIS_8 }, 426 { BFD_RELOC_16, R_CRIS_16 }, 427 { BFD_RELOC_32, R_CRIS_32 }, 428 { BFD_RELOC_8_PCREL, R_CRIS_8_PCREL }, 429 { BFD_RELOC_16_PCREL, R_CRIS_16_PCREL }, 430 { BFD_RELOC_32_PCREL, R_CRIS_32_PCREL }, 431 { BFD_RELOC_VTABLE_INHERIT, R_CRIS_GNU_VTINHERIT }, 432 { BFD_RELOC_VTABLE_ENTRY, R_CRIS_GNU_VTENTRY }, 433 { BFD_RELOC_CRIS_COPY, R_CRIS_COPY }, 434 { BFD_RELOC_CRIS_GLOB_DAT, R_CRIS_GLOB_DAT }, 435 { BFD_RELOC_CRIS_JUMP_SLOT, R_CRIS_JUMP_SLOT }, 436 { BFD_RELOC_CRIS_RELATIVE, R_CRIS_RELATIVE }, 437 { BFD_RELOC_CRIS_16_GOT, R_CRIS_16_GOT }, 438 { BFD_RELOC_CRIS_32_GOT, R_CRIS_32_GOT }, 439 { BFD_RELOC_CRIS_16_GOTPLT, R_CRIS_16_GOTPLT }, 440 { BFD_RELOC_CRIS_32_GOTPLT, R_CRIS_32_GOTPLT }, 441 { BFD_RELOC_CRIS_32_GOTREL, R_CRIS_32_GOTREL }, 442 { BFD_RELOC_CRIS_32_PLT_GOTREL, R_CRIS_32_PLT_GOTREL }, 443 { BFD_RELOC_CRIS_32_PLT_PCREL, R_CRIS_32_PLT_PCREL } 444}; 445 446static reloc_howto_type * 447cris_reloc_type_lookup (abfd, code) 448 bfd * abfd ATTRIBUTE_UNUSED; 449 bfd_reloc_code_real_type code; 450{ 451 unsigned int i; 452 453 for (i = 0; i < sizeof (cris_reloc_map) / sizeof (cris_reloc_map[0]); i++) 454 if (cris_reloc_map [i].bfd_reloc_val == code) 455 return & cris_elf_howto_table [cris_reloc_map[i].cris_reloc_val]; 456 457 return NULL; 458} 459 460/* Set the howto pointer for an CRIS ELF reloc. */ 461 462static void 463cris_info_to_howto_rela (abfd, cache_ptr, dst) 464 bfd * abfd ATTRIBUTE_UNUSED; 465 arelent * cache_ptr; 466 Elf_Internal_Rela * dst; 467{ 468 unsigned int r_type; 469 470 r_type = ELF32_R_TYPE (dst->r_info); 471 BFD_ASSERT (r_type < (unsigned int) R_CRIS_max); 472 cache_ptr->howto = & cris_elf_howto_table [r_type]; 473} 474 475bfd_reloc_status_type 476cris_elf_pcrel_reloc (abfd, reloc_entry, symbol, data, input_section, 477 output_bfd, error_message) 478 bfd *abfd ATTRIBUTE_UNUSED; 479 arelent *reloc_entry; 480 asymbol *symbol; 481 PTR data ATTRIBUTE_UNUSED; 482 asection *input_section; 483 bfd *output_bfd; 484 char **error_message ATTRIBUTE_UNUSED; 485{ 486 /* By default (using only bfd_elf_generic_reloc when linking to 487 non-ELF formats) PC-relative relocs are relative to the beginning 488 of the reloc. CRIS PC-relative relocs are relative to the position 489 *after* the reloc because that's what pre-CRISv32 PC points to 490 after reading an insn field with that reloc. (For CRISv32, PC is 491 actually relative to the start of the insn, but we keep the old 492 definition.) Still, we use as much generic machinery as we can. 493 494 Only adjust when doing a final link. */ 495 if (output_bfd == (bfd *) NULL) 496 reloc_entry->addend -= 1 << reloc_entry->howto->size; 497 498 return 499 bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 500 input_section, output_bfd, error_message); 501} 502 503/* Support for core dump NOTE sections. 504 The slightly unintuitive code layout is an attempt to keep at least 505 some similarities with other ports, hoping to simplify general 506 changes, while still keeping Linux/CRIS and Linux/CRISv32 code apart. */ 507 508static bfd_boolean 509cris_elf_grok_prstatus (abfd, note) 510 bfd *abfd; 511 Elf_Internal_Note *note; 512{ 513 int offset; 514 size_t size; 515 516 if (bfd_get_mach (abfd) == bfd_mach_cris_v32) 517 switch (note->descsz) 518 { 519 default: 520 return FALSE; 521 522 case 202: /* Linux/CRISv32 */ 523 /* pr_cursig */ 524 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 525 526 /* pr_pid */ 527 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 22); 528 529 /* pr_reg */ 530 offset = 70; 531 size = 128; 532 533 break; 534 } 535 else 536 switch (note->descsz) 537 { 538 default: 539 return FALSE; 540 541 case 214: /* Linux/CRIS */ 542 /* pr_cursig */ 543 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 544 545 /* pr_pid */ 546 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 22); 547 548 /* pr_reg */ 549 offset = 70; 550 size = 140; 551 552 break; 553 } 554 555 /* Make a ".reg/999" section. */ 556 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 557 size, note->descpos + offset); 558} 559 560static bfd_boolean 561cris_elf_grok_psinfo (abfd, note) 562 bfd *abfd; 563 Elf_Internal_Note *note; 564{ 565 if (bfd_get_mach (abfd) == bfd_mach_cris_v32) 566 switch (note->descsz) 567 { 568 default: 569 return FALSE; 570 571 case 124: /* Linux/CRISv32 elf_prpsinfo */ 572 elf_tdata (abfd)->core_program 573 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 574 elf_tdata (abfd)->core_command 575 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 576 } 577 else 578 switch (note->descsz) 579 { 580 default: 581 return FALSE; 582 583 case 124: /* Linux/CRIS elf_prpsinfo */ 584 elf_tdata (abfd)->core_program 585 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 586 elf_tdata (abfd)->core_command 587 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 588 } 589 590 /* Note that for some reason, a spurious space is tacked 591 onto the end of the args in some (at least one anyway) 592 implementations, so strip it off if it exists. */ 593 594 { 595 char *command = elf_tdata (abfd)->core_command; 596 int n = strlen (command); 597 598 if (0 < n && command[n - 1] == ' ') 599 command[n - 1] = '\0'; 600 } 601 602 return TRUE; 603} 604 605/* The name of the dynamic interpreter. This is put in the .interp 606 section. */ 607 608#define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" 609 610/* The size in bytes of an entry in the procedure linkage table. */ 611 612#define PLT_ENTRY_SIZE 20 613#define PLT_ENTRY_SIZE_V32 26 614 615/* The first entry in an absolute procedure linkage table looks like this. */ 616 617static const bfd_byte elf_cris_plt0_entry[PLT_ENTRY_SIZE] = 618{ 619 0xfc, 0xe1, 620 0x7e, 0x7e, /* push mof. */ 621 0x7f, 0x0d, /* (dip [pc+]) */ 622 0, 0, 0, 0, /* Replaced with address of .got + 4. */ 623 0x30, 0x7a, /* move [...],mof */ 624 0x7f, 0x0d, /* (dip [pc+]) */ 625 0, 0, 0, 0, /* Replaced with address of .got + 8. */ 626 0x30, 0x09 /* jump [...] */ 627}; 628 629static const bfd_byte elf_cris_plt0_entry_v32[PLT_ENTRY_SIZE_V32] = 630{ 631 0x84, 0xe2, /* subq 4,$sp */ 632 0x6f, 0xfe, /* move.d 0,$acr */ 633 0, 0, 0, 0, /* Replaced by address of .got + 4. */ 634 0x7e, 0x7a, /* move $mof,[$sp] */ 635 0x3f, 0x7a, /* move [$acr],$mof */ 636 0x04, 0xf2, /* addq 4,acr */ 637 0x6f, 0xfa, /* move.d [$acr],$acr */ 638 0xbf, 0x09, /* jump $acr */ 639 0xb0, 0x05, /* nop */ 640 0, 0 /* Pad out to 26 bytes. */ 641}; 642 643/* Subsequent entries in an absolute procedure linkage table look like 644 this. */ 645 646static const bfd_byte elf_cris_plt_entry[PLT_ENTRY_SIZE] = 647{ 648 0x7f, 0x0d, /* (dip [pc+]) */ 649 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */ 650 0x30, 0x09, /* jump [...] */ 651 0x3f, 0x7e, /* move [pc+],mof */ 652 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 653 0x2f, 0xfe, /* add.d [pc+],pc */ 654 0xec, 0xff, 655 0xff, 0xff /* Replaced with offset to start of .plt. */ 656}; 657 658static const bfd_byte elf_cris_plt_entry_v32[PLT_ENTRY_SIZE_V32] = 659{ 660 0x6f, 0xfe, /* move.d 0,$acr */ 661 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */ 662 0x6f, 0xfa, /* move.d [$acr],$acr */ 663 0xbf, 0x09, /* jump $acr */ 664 0xb0, 0x05, /* nop */ 665 0x3f, 0x7e, /* move 0,mof */ 666 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 667 0xbf, 0x0e, /* ba start_of_plt0_entry */ 668 0, 0, 0, 0, /* Replaced with offset to plt0 entry. */ 669 0xb0, 0x05 /* nop */ 670}; 671 672/* The first entry in a PIC procedure linkage table looks like this. */ 673 674static const bfd_byte elf_cris_pic_plt0_entry[PLT_ENTRY_SIZE] = 675{ 676 0xfc, 0xe1, 0x7e, 0x7e, /* push mof */ 677 0x04, 0x01, 0x30, 0x7a, /* move [r0+4],mof */ 678 0x08, 0x01, 0x30, 0x09, /* jump [r0+8] */ 679 0, 0, 0, 0, 0, 0, 0, 0, /* Pad out to 20 bytes. */ 680}; 681 682static const bfd_byte elf_cris_pic_plt0_entry_v32[PLT_ENTRY_SIZE_V32] = 683{ 684 0x84, 0xe2, /* subq 4,$sp */ 685 0x04, 0x01, /* addoq 4,$r0,$acr */ 686 0x7e, 0x7a, /* move $mof,[$sp] */ 687 0x3f, 0x7a, /* move [$acr],$mof */ 688 0x04, 0xf2, /* addq 4,$acr */ 689 0x6f, 0xfa, /* move.d [$acr],$acr */ 690 0xbf, 0x09, /* jump $acr */ 691 0xb0, 0x05, /* nop */ 692 0, 0, /* Pad out to 26 bytes. */ 693 0, 0, 0, 0, 694 0, 0, 0, 0 695}; 696 697/* Subsequent entries in a PIC procedure linkage table look like this. */ 698 699static const bfd_byte elf_cris_pic_plt_entry[PLT_ENTRY_SIZE] = 700{ 701 0x6f, 0x0d, /* (bdap [pc+].d,r0) */ 702 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */ 703 0x30, 0x09, /* jump [...] */ 704 0x3f, 0x7e, /* move [pc+],mof */ 705 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 706 0x2f, 0xfe, /* add.d [pc+],pc */ 707 0xec, 0xff, /* Replaced with offset to start of .plt. */ 708 0xff, 0xff 709}; 710 711static const bfd_byte elf_cris_pic_plt_entry_v32[PLT_ENTRY_SIZE_V32] = 712{ 713 0x6f, 0x0d, /* addo.d 0,$r0,$acr */ 714 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */ 715 0x6f, 0xfa, /* move.d [$acr],$acr */ 716 0xbf, 0x09, /* jump $acr */ 717 0xb0, 0x05, /* nop */ 718 0x3f, 0x7e, /* move relocoffs,$mof */ 719 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 720 0xbf, 0x0e, /* ba start_of_plt */ 721 0, 0, 0, 0, /* Replaced with offset to start of .plt. */ 722 0xb0, 0x05 /* nop */ 723}; 724 725/* We copy elf32-m68k.c and elf32-i386.c for the basic linker hash bits 726 (and most other PIC/shlib stuff). Check that we don't drift away 727 without reason. 728 729 The CRIS linker, like the m68k and i386 linkers (and probably the rest 730 too) needs to keep track of the number of relocs that it decides to 731 copy in check_relocs for each symbol. This is so that it can discard 732 PC relative relocs if it doesn't need them when linking with 733 -Bsymbolic. We store the information in a field extending the regular 734 ELF linker hash table. */ 735 736/* This structure keeps track of the number of PC relative relocs we have 737 copied for a given symbol. */ 738 739struct elf_cris_pcrel_relocs_copied 740{ 741 /* Next section. */ 742 struct elf_cris_pcrel_relocs_copied *next; 743 /* A section in dynobj. */ 744 asection *section; 745 /* Number of relocs copied in this section. */ 746 bfd_size_type count; 747}; 748 749/* CRIS ELF linker hash entry. */ 750 751struct elf_cris_link_hash_entry 752{ 753 struct elf_link_hash_entry root; 754 755 /* Number of PC relative relocs copied for this symbol. */ 756 struct elf_cris_pcrel_relocs_copied *pcrel_relocs_copied; 757 758 /* The GOTPLT references are CRIS-specific; the goal is to avoid having 759 both a general GOT and a PLT-specific GOT entry for the same symbol, 760 when it is referenced both as a function and as a function pointer. 761 762 Number of GOTPLT references for a function. */ 763 bfd_signed_vma gotplt_refcount; 764 765 /* Actual GOTPLT index for this symbol, if applicable, or zero if not 766 (zero is never used as an index). FIXME: We should be able to fold 767 this with gotplt_refcount in a union, like the got and plt unions in 768 elf_link_hash_entry. */ 769 bfd_size_type gotplt_offset; 770}; 771 772/* CRIS ELF linker hash table. */ 773 774struct elf_cris_link_hash_table 775{ 776 struct elf_link_hash_table root; 777 778 /* We can't use the PLT offset and calculate to get the GOTPLT offset, 779 since we try and avoid creating GOTPLT:s when there's already a GOT. 780 Instead, we keep and update the next available index here. */ 781 bfd_size_type next_gotplt_entry; 782}; 783 784/* Traverse a CRIS ELF linker hash table. */ 785 786#define elf_cris_link_hash_traverse(table, func, info) \ 787 (elf_link_hash_traverse \ 788 (&(table)->root, \ 789 (bfd_boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ 790 (info))) 791 792/* Get the CRIS ELF linker hash table from a link_info structure. */ 793 794#define elf_cris_hash_table(p) \ 795 ((struct elf_cris_link_hash_table *) (p)->hash) 796 797/* Create an entry in a CRIS ELF linker hash table. */ 798 799static struct bfd_hash_entry * 800elf_cris_link_hash_newfunc (entry, table, string) 801 struct bfd_hash_entry *entry; 802 struct bfd_hash_table *table; 803 const char *string; 804{ 805 struct elf_cris_link_hash_entry *ret = 806 (struct elf_cris_link_hash_entry *) entry; 807 808 /* Allocate the structure if it has not already been allocated by a 809 subclass. */ 810 if (ret == (struct elf_cris_link_hash_entry *) NULL) 811 ret = ((struct elf_cris_link_hash_entry *) 812 bfd_hash_allocate (table, 813 sizeof (struct elf_cris_link_hash_entry))); 814 if (ret == (struct elf_cris_link_hash_entry *) NULL) 815 return (struct bfd_hash_entry *) ret; 816 817 /* Call the allocation method of the superclass. */ 818 ret = ((struct elf_cris_link_hash_entry *) 819 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 820 table, string)); 821 if (ret != (struct elf_cris_link_hash_entry *) NULL) 822 { 823 ret->pcrel_relocs_copied = NULL; 824 ret->gotplt_refcount = 0; 825 ret->gotplt_offset = 0; 826 } 827 828 return (struct bfd_hash_entry *) ret; 829} 830 831/* Create a CRIS ELF linker hash table. */ 832 833static struct bfd_link_hash_table * 834elf_cris_link_hash_table_create (abfd) 835 bfd *abfd; 836{ 837 struct elf_cris_link_hash_table *ret; 838 bfd_size_type amt = sizeof (struct elf_cris_link_hash_table); 839 840 ret = ((struct elf_cris_link_hash_table *) bfd_malloc (amt)); 841 if (ret == (struct elf_cris_link_hash_table *) NULL) 842 return NULL; 843 844 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 845 elf_cris_link_hash_newfunc, 846 sizeof (struct elf_cris_link_hash_entry))) 847 { 848 free (ret); 849 return NULL; 850 } 851 852 /* Initialize to skip over the first three entries in the gotplt; they 853 are used for run-time symbol evaluation. */ 854 ret->next_gotplt_entry = 12; 855 856 return &ret->root.root; 857} 858 859/* Perform a single relocation. By default we use the standard BFD 860 routines, with a few tweaks. */ 861 862static bfd_reloc_status_type 863cris_final_link_relocate (howto, input_bfd, input_section, contents, rel, 864 relocation) 865 reloc_howto_type * howto; 866 bfd * input_bfd; 867 asection * input_section; 868 bfd_byte * contents; 869 Elf_Internal_Rela * rel; 870 bfd_vma relocation; 871{ 872 bfd_reloc_status_type r; 873 874 /* PC-relative relocations are relative to the position *after* 875 the reloc. Note that for R_CRIS_8_PCREL the adjustment is 876 not a single byte, since PC must be 16-bit-aligned. */ 877 switch (ELF32_R_TYPE (rel->r_info)) 878 { 879 /* Check that the 16-bit GOT relocs are positive. */ 880 case R_CRIS_16_GOTPLT: 881 case R_CRIS_16_GOT: 882 if ((bfd_signed_vma) relocation < 0) 883 return bfd_reloc_overflow; 884 break; 885 886 case R_CRIS_32_PLT_PCREL: 887 case R_CRIS_32_PCREL: 888 relocation -= 2; 889 /* Fall through. */ 890 case R_CRIS_8_PCREL: 891 case R_CRIS_16_PCREL: 892 relocation -= 2; 893 break; 894 895 default: 896 break; 897 } 898 899 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 900 contents, rel->r_offset, 901 relocation, rel->r_addend); 902 return r; 903} 904 905/* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was 906 copied, for further comments. */ 907 908static bfd_boolean 909cris_elf_relocate_section (output_bfd, info, input_bfd, input_section, 910 contents, relocs, local_syms, local_sections) 911 bfd *output_bfd ATTRIBUTE_UNUSED; 912 struct bfd_link_info *info; 913 bfd *input_bfd; 914 asection *input_section; 915 bfd_byte *contents; 916 Elf_Internal_Rela *relocs; 917 Elf_Internal_Sym *local_syms; 918 asection **local_sections; 919{ 920 bfd *dynobj; 921 Elf_Internal_Shdr *symtab_hdr; 922 struct elf_link_hash_entry **sym_hashes; 923 bfd_vma *local_got_offsets; 924 asection *sgot; 925 asection *splt; 926 asection *sreloc; 927 Elf_Internal_Rela *rel; 928 Elf_Internal_Rela *relend; 929 930 if (info->relocatable) 931 return TRUE; 932 933 dynobj = elf_hash_table (info)->dynobj; 934 local_got_offsets = elf_local_got_offsets (input_bfd); 935 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 936 sym_hashes = elf_sym_hashes (input_bfd); 937 relend = relocs + input_section->reloc_count; 938 939 sgot = NULL; 940 splt = NULL; 941 sreloc = NULL; 942 943 if (dynobj != NULL) 944 { 945 splt = bfd_get_section_by_name (dynobj, ".plt"); 946 sgot = bfd_get_section_by_name (dynobj, ".got"); 947 } 948 949 for (rel = relocs; rel < relend; rel ++) 950 { 951 reloc_howto_type *howto; 952 unsigned long r_symndx; 953 Elf_Internal_Sym *sym; 954 asection *sec; 955 struct elf_link_hash_entry *h; 956 bfd_vma relocation; 957 bfd_reloc_status_type r; 958 const char *symname = NULL; 959 int r_type; 960 961 r_type = ELF32_R_TYPE (rel->r_info); 962 963 if ( r_type == R_CRIS_GNU_VTINHERIT 964 || r_type == R_CRIS_GNU_VTENTRY) 965 continue; 966 967 /* This is a final link. */ 968 r_symndx = ELF32_R_SYM (rel->r_info); 969 howto = cris_elf_howto_table + r_type; 970 h = NULL; 971 sym = NULL; 972 sec = NULL; 973 974 if (r_symndx < symtab_hdr->sh_info) 975 { 976 sym = local_syms + r_symndx; 977 sec = local_sections [r_symndx]; 978 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 979 980 symname = (bfd_elf_string_from_elf_section 981 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 982 if (symname == NULL) 983 symname = bfd_section_name (input_bfd, sec); 984 } 985 else 986 { 987 bfd_boolean warned; 988 bfd_boolean unresolved_reloc; 989 990 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 991 r_symndx, symtab_hdr, sym_hashes, 992 h, sec, relocation, 993 unresolved_reloc, warned); 994 995 if (unresolved_reloc 996 /* Perhaps we should detect the cases that 997 sec->output_section is expected to be NULL like i386 and 998 m68k, but apparently (and according to elfxx-ia64.c) all 999 valid cases are where the symbol is defined in a shared 1000 object which we link dynamically against. This includes 1001 PLT relocs for which we've created a PLT entry and other 1002 relocs for which we're prepared to create dynamic 1003 relocations. 1004 1005 For now, new situations cause us to just err when 1006 sec->output_offset is NULL but the object with the symbol 1007 is *not* dynamically linked against. Thus this will 1008 automatically remind us so we can see if there are other 1009 valid cases we need to revisit. */ 1010 && (sec->owner->flags & DYNAMIC) != 0) 1011 relocation = 0; 1012 1013 else if (h->root.type == bfd_link_hash_defined 1014 || h->root.type == bfd_link_hash_defweak) 1015 { 1016 /* Here follow the cases where the relocation value must 1017 be zero (or when further handling is simplified when 1018 zero). I can't claim to understand the various 1019 conditions and they weren't described in the files 1020 where I copied them from (elf32-m68k.c and 1021 elf32-i386.c), but let's mention examples of where 1022 they happen. FIXME: Perhaps define and use a 1023 dynamic_symbol_p function like ia64. 1024 1025 - When creating a shared library, we can have an 1026 ordinary relocation for a symbol defined in a shared 1027 library (perhaps the one we create). We then make 1028 the relocation value zero, as the value seen now will 1029 be added into the relocation addend in this shared 1030 library, but must be handled only at dynamic-link 1031 time. FIXME: Not sure this example covers the 1032 h->elf_link_hash_flags test, though it's there in 1033 other targets. */ 1034 if (info->shared 1035 && ((! info->symbolic && h->dynindx != -1) 1036 || !h->def_regular) 1037 && (input_section->flags & SEC_ALLOC) != 0 1038 && (r_type == R_CRIS_8 1039 || r_type == R_CRIS_16 1040 || r_type == R_CRIS_32 1041 || r_type == R_CRIS_8_PCREL 1042 || r_type == R_CRIS_16_PCREL 1043 || r_type == R_CRIS_32_PCREL)) 1044 relocation = 0; 1045 else if (unresolved_reloc) 1046 { 1047 _bfd_error_handler 1048 (_("%B, section %A: unresolvable relocation %s against symbol `%s'"), 1049 input_bfd, 1050 input_section, 1051 cris_elf_howto_table[r_type].name, 1052 symname); 1053 bfd_set_error (bfd_error_bad_value); 1054 return FALSE; 1055 } 1056 } 1057 } 1058 1059 switch (r_type) 1060 { 1061 case R_CRIS_16_GOTPLT: 1062 case R_CRIS_32_GOTPLT: 1063 /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT, 1064 but we require a PLT, and the PLT handling will take care of 1065 filling in the PLT-specific GOT entry. For the GOT offset, 1066 calculate it as we do when filling it in for the .got.plt 1067 section. If we don't have a PLT, punt to GOT handling. */ 1068 if (h != NULL 1069 && ((struct elf_cris_link_hash_entry *) h)->gotplt_offset != 0) 1070 { 1071 asection *sgotplt 1072 = bfd_get_section_by_name (dynobj, ".got.plt"); 1073 bfd_vma got_offset; 1074 1075 BFD_ASSERT (h->dynindx != -1); 1076 BFD_ASSERT (sgotplt != NULL); 1077 1078 got_offset 1079 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset; 1080 1081 relocation = got_offset; 1082 break; 1083 } 1084 1085 /* We didn't make a PLT entry for this symbol. Maybe everything is 1086 folded into the GOT. Other than folding, this happens when 1087 statically linking PIC code, or when using -Bsymbolic. Check 1088 that we instead have a GOT entry as done for us by 1089 elf_cris_adjust_dynamic_symbol, and drop through into the 1090 ordinary GOT cases. This must not happen for the 1091 executable, because any reference it does to a function 1092 that is satisfied by a DSO must generate a PLT. We assume 1093 these call-specific relocs don't address non-functions. */ 1094 if (h != NULL 1095 && (h->got.offset == (bfd_vma) -1 1096 || (!info->shared 1097 && !(h->def_regular 1098 || (!h->def_dynamic 1099 && h->root.type == bfd_link_hash_undefweak))))) 1100 { 1101 (*_bfd_error_handler) 1102 ((h->got.offset == (bfd_vma) -1) 1103 ? _("%B, section %A: No PLT nor GOT for relocation %s" 1104 " against symbol `%s'") 1105 : _("%B, section %A: No PLT for relocation %s" 1106 " against symbol `%s'"), 1107 input_bfd, 1108 input_section, 1109 cris_elf_howto_table[r_type].name, 1110 (symname != NULL && symname[0] != '\0' 1111 ? symname : _("[whose name is lost]"))); 1112 1113 /* FIXME: Perhaps blaming input is not the right thing to 1114 do; this is probably an internal error. But it is true 1115 that we didn't like that particular input. */ 1116 bfd_set_error (bfd_error_bad_value); 1117 return FALSE; 1118 } 1119 /* Fall through. */ 1120 1121 /* The size of the actual relocation is not used here; we only 1122 fill in the GOT table here. */ 1123 case R_CRIS_16_GOT: 1124 case R_CRIS_32_GOT: 1125 { 1126 bfd_vma off; 1127 1128 /* Note that despite using RELA relocations, the .got contents 1129 is always filled in with the link-relative relocation 1130 value; the addend. */ 1131 1132 if (h != NULL) 1133 { 1134 off = h->got.offset; 1135 BFD_ASSERT (off != (bfd_vma) -1); 1136 1137 if (!elf_hash_table (info)->dynamic_sections_created 1138 || (! info->shared 1139 && (h->def_regular 1140 || h->type == STT_FUNC 1141 || h->needs_plt)) 1142 || (info->shared 1143 && (info->symbolic || h->dynindx == -1) 1144 && h->def_regular)) 1145 { 1146 /* This wasn't checked above for ! info->shared, but 1147 must hold there if we get here; the symbol must 1148 be defined in the regular program or be undefweak 1149 or be a function or otherwise need a PLT. */ 1150 BFD_ASSERT (!elf_hash_table (info)->dynamic_sections_created 1151 || info->shared 1152 || h->def_regular 1153 || h->type == STT_FUNC 1154 || h->needs_plt 1155 || h->root.type == bfd_link_hash_undefweak); 1156 1157 /* This is actually a static link, or it is a 1158 -Bsymbolic link and the symbol is defined locally, 1159 or is undefweak, or the symbol was forced to be 1160 local because of a version file, or we're not 1161 creating a dynamic object. We must initialize this 1162 entry in the global offset table. Since the offset 1163 must always be a multiple of 4, we use the least 1164 significant bit to record whether we have 1165 initialized it already. 1166 1167 If this GOT entry should be runtime-initialized, we 1168 will create a .rela.got relocation entry to 1169 initialize the value. This is done in the 1170 finish_dynamic_symbol routine. */ 1171 if ((off & 1) != 0) 1172 off &= ~1; 1173 else 1174 { 1175 bfd_put_32 (output_bfd, relocation, 1176 sgot->contents + off); 1177 h->got.offset |= 1; 1178 } 1179 } 1180 } 1181 else 1182 { 1183 BFD_ASSERT (local_got_offsets != NULL 1184 && local_got_offsets[r_symndx] != (bfd_vma) -1); 1185 1186 off = local_got_offsets[r_symndx]; 1187 1188 /* The offset must always be a multiple of 4. We use 1189 the least significant bit to record whether we have 1190 already generated the necessary reloc. */ 1191 if ((off & 1) != 0) 1192 off &= ~1; 1193 else 1194 { 1195 bfd_put_32 (output_bfd, relocation, sgot->contents + off); 1196 1197 if (info->shared) 1198 { 1199 asection *s; 1200 Elf_Internal_Rela outrel; 1201 bfd_byte *loc; 1202 1203 s = bfd_get_section_by_name (dynobj, ".rela.got"); 1204 BFD_ASSERT (s != NULL); 1205 1206 outrel.r_offset = (sgot->output_section->vma 1207 + sgot->output_offset 1208 + off); 1209 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); 1210 outrel.r_addend = relocation; 1211 loc = s->contents; 1212 loc += s->reloc_count++ * sizeof (Elf32_External_Rela); 1213 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1214 } 1215 1216 local_got_offsets[r_symndx] |= 1; 1217 } 1218 } 1219 1220 relocation = sgot->output_offset + off; 1221 if (rel->r_addend != 0) 1222 { 1223 /* We can't do anything for a relocation which is against 1224 a symbol *plus offset*. GOT holds relocations for 1225 symbols. Make this an error; the compiler isn't 1226 allowed to pass us these kinds of things. */ 1227 if (h == NULL) 1228 (*_bfd_error_handler) 1229 (_("%B, section %A: relocation %s with non-zero addend %d" 1230 " against local symbol"), 1231 input_bfd, 1232 input_section, 1233 cris_elf_howto_table[r_type].name, 1234 rel->r_addend); 1235 else 1236 (*_bfd_error_handler) 1237 (_("%B, section %A: relocation %s with non-zero addend %d" 1238 " against symbol `%s'"), 1239 input_bfd, 1240 input_section, 1241 cris_elf_howto_table[r_type].name, 1242 rel->r_addend, 1243 symname[0] != '\0' ? symname : _("[whose name is lost]")); 1244 1245 bfd_set_error (bfd_error_bad_value); 1246 return FALSE; 1247 } 1248 } 1249 break; 1250 1251 case R_CRIS_32_GOTREL: 1252 /* This relocation must only be performed against local symbols. 1253 It's also ok when we link a program and the symbol is either 1254 defined in an ordinary (non-DSO) object or is undefined weak. */ 1255 if (h != NULL 1256 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1257 && !(!info->shared 1258 && (h->def_regular 1259 || (!h->def_dynamic 1260 && h->root.type == bfd_link_hash_undefweak)))) 1261 { 1262 (*_bfd_error_handler) 1263 (_("%B, section %A: relocation %s is" 1264 " not allowed for global symbol: `%s'"), 1265 input_bfd, 1266 input_section, 1267 cris_elf_howto_table[r_type].name, 1268 symname); 1269 bfd_set_error (bfd_error_bad_value); 1270 return FALSE; 1271 } 1272 1273 /* This can happen if we get a link error with the input ELF 1274 variant mismatching the output variant. Emit an error so 1275 it's noticed if it happens elsewhere. */ 1276 if (sgot == NULL) 1277 { 1278 (*_bfd_error_handler) 1279 (_("%B, section %A: relocation %s with no GOT created"), 1280 input_bfd, 1281 input_section, 1282 cris_elf_howto_table[r_type].name); 1283 bfd_set_error (bfd_error_bad_value); 1284 return FALSE; 1285 } 1286 1287 /* This relocation is like a PC-relative one, except the 1288 reference point is the location of GOT. Note that 1289 sgot->output_offset is not involved in this calculation. We 1290 always want the start of entire .got section, not the 1291 position after the reserved header. */ 1292 relocation -= sgot->output_section->vma; 1293 break; 1294 1295 case R_CRIS_32_PLT_PCREL: 1296 /* Relocation is to the entry for this symbol in the 1297 procedure linkage table. */ 1298 1299 /* Resolve a PLT_PCREL reloc against a local symbol directly, 1300 without using the procedure linkage table. */ 1301 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1302 break; 1303 1304 if (h->plt.offset == (bfd_vma) -1 1305 || splt == NULL) 1306 { 1307 /* We didn't make a PLT entry for this symbol. This 1308 happens when statically linking PIC code, or when 1309 using -Bsymbolic. */ 1310 break; 1311 } 1312 1313 relocation = (splt->output_section->vma 1314 + splt->output_offset 1315 + h->plt.offset); 1316 break; 1317 1318 case R_CRIS_32_PLT_GOTREL: 1319 /* Like R_CRIS_32_PLT_PCREL, but the reference point is the 1320 start of the .got section. See also comment at 1321 R_CRIS_32_GOT. */ 1322 relocation -= sgot->output_section->vma; 1323 1324 /* Resolve a PLT_GOTREL reloc against a local symbol directly, 1325 without using the procedure linkage table. */ 1326 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1327 break; 1328 1329 if (h->plt.offset == (bfd_vma) -1 1330 || splt == NULL) 1331 { 1332 /* We didn't make a PLT entry for this symbol. This 1333 happens when statically linking PIC code, or when 1334 using -Bsymbolic. */ 1335 break; 1336 } 1337 1338 relocation = (splt->output_section->vma 1339 + splt->output_offset 1340 + h->plt.offset 1341 - sgot->output_section->vma); 1342 break; 1343 1344 case R_CRIS_8_PCREL: 1345 case R_CRIS_16_PCREL: 1346 case R_CRIS_32_PCREL: 1347 /* If the symbol was local, we need no shlib-specific handling. */ 1348 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1349 break; 1350 1351 /* Fall through. */ 1352 case R_CRIS_8: 1353 case R_CRIS_16: 1354 case R_CRIS_32: 1355 if (info->shared 1356 && r_symndx != 0 1357 && (input_section->flags & SEC_ALLOC) != 0 1358 && ((r_type != R_CRIS_8_PCREL 1359 && r_type != R_CRIS_16_PCREL 1360 && r_type != R_CRIS_32_PCREL) 1361 || (!info->symbolic 1362 || !h->def_regular))) 1363 { 1364 Elf_Internal_Rela outrel; 1365 bfd_byte *loc; 1366 bfd_boolean skip, relocate; 1367 1368 /* When generating a shared object, these relocations 1369 are copied into the output file to be resolved at run 1370 time. */ 1371 1372 if (sreloc == NULL) 1373 { 1374 const char *name; 1375 1376 name = (bfd_elf_string_from_elf_section 1377 (input_bfd, 1378 elf_elfheader (input_bfd)->e_shstrndx, 1379 elf_section_data (input_section)->rel_hdr.sh_name)); 1380 if (name == NULL) 1381 return FALSE; 1382 1383 BFD_ASSERT (CONST_STRNEQ (name, ".rela") 1384 && strcmp (bfd_get_section_name (input_bfd, 1385 input_section), 1386 name + 5) == 0); 1387 1388 sreloc = bfd_get_section_by_name (dynobj, name); 1389 1390 /* That section should have been created in 1391 cris_elf_check_relocs, but that function will not be 1392 called for objects which fail in 1393 cris_elf_merge_private_bfd_data. */ 1394 if (sreloc == NULL) 1395 { 1396 (*_bfd_error_handler) 1397 (_("%B: Internal inconsistency; no relocation section %s"), 1398 input_bfd, 1399 name); 1400 1401 bfd_set_error (bfd_error_bad_value); 1402 return FALSE; 1403 } 1404 } 1405 1406 skip = FALSE; 1407 relocate = FALSE; 1408 1409 outrel.r_offset = 1410 _bfd_elf_section_offset (output_bfd, info, input_section, 1411 rel->r_offset); 1412 if (outrel.r_offset == (bfd_vma) -1) 1413 skip = TRUE; 1414 else if (outrel.r_offset == (bfd_vma) -2) 1415 skip = TRUE, relocate = TRUE; 1416 outrel.r_offset += (input_section->output_section->vma 1417 + input_section->output_offset); 1418 1419 if (skip) 1420 memset (&outrel, 0, sizeof outrel); 1421 /* h->dynindx may be -1 if the symbol was marked to 1422 become local. */ 1423 else if (h != NULL 1424 && ((! info->symbolic && h->dynindx != -1) 1425 || !h->def_regular)) 1426 { 1427 BFD_ASSERT (h->dynindx != -1); 1428 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1429 outrel.r_addend = relocation + rel->r_addend; 1430 } 1431 else 1432 { 1433 outrel.r_addend = relocation + rel->r_addend; 1434 1435 if (r_type == R_CRIS_32) 1436 { 1437 relocate = TRUE; 1438 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); 1439 } 1440 else 1441 { 1442 long indx; 1443 1444 if (bfd_is_abs_section (sec)) 1445 indx = 0; 1446 else if (sec == NULL || sec->owner == NULL) 1447 { 1448 bfd_set_error (bfd_error_bad_value); 1449 return FALSE; 1450 } 1451 else 1452 { 1453 asection *osec; 1454 1455 /* We are turning this relocation into one 1456 against a section symbol. It would be 1457 proper to subtract the symbol's value, 1458 osec->vma, from the emitted reloc addend, 1459 but ld.so expects buggy relocs. */ 1460 osec = sec->output_section; 1461 indx = elf_section_data (osec)->dynindx; 1462 if (indx == 0) 1463 { 1464 struct elf_cris_link_hash_table *htab; 1465 htab = elf_cris_hash_table (info); 1466 osec = htab->root.text_index_section; 1467 indx = elf_section_data (osec)->dynindx; 1468 } 1469 BFD_ASSERT (indx != 0); 1470 } 1471 1472 outrel.r_info = ELF32_R_INFO (indx, r_type); 1473 } 1474 } 1475 1476 loc = sreloc->contents; 1477 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1478 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1479 1480 /* This reloc will be computed at runtime, so there's no 1481 need to do anything now, except for R_CRIS_32 relocations 1482 that have been turned into R_CRIS_RELATIVE. */ 1483 if (!relocate) 1484 continue; 1485 } 1486 1487 break; 1488 } 1489 1490 r = cris_final_link_relocate (howto, input_bfd, input_section, 1491 contents, rel, relocation); 1492 1493 if (r != bfd_reloc_ok) 1494 { 1495 const char * msg = (const char *) NULL; 1496 1497 switch (r) 1498 { 1499 case bfd_reloc_overflow: 1500 r = info->callbacks->reloc_overflow 1501 (info, (h ? &h->root : NULL), symname, howto->name, 1502 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1503 break; 1504 1505 case bfd_reloc_undefined: 1506 r = info->callbacks->undefined_symbol 1507 (info, symname, input_bfd, input_section, rel->r_offset, 1508 TRUE); 1509 break; 1510 1511 case bfd_reloc_outofrange: 1512 msg = _("internal error: out of range error"); 1513 break; 1514 1515 case bfd_reloc_notsupported: 1516 msg = _("internal error: unsupported relocation error"); 1517 break; 1518 1519 case bfd_reloc_dangerous: 1520 msg = _("internal error: dangerous relocation"); 1521 break; 1522 1523 default: 1524 msg = _("internal error: unknown error"); 1525 break; 1526 } 1527 1528 if (msg) 1529 r = info->callbacks->warning 1530 (info, msg, symname, input_bfd, input_section, rel->r_offset); 1531 1532 if (! r) 1533 return FALSE; 1534 } 1535 } 1536 1537 return TRUE; 1538} 1539 1540/* Finish up dynamic symbol handling. We set the contents of various 1541 dynamic sections here. */ 1542 1543static bfd_boolean 1544elf_cris_finish_dynamic_symbol (output_bfd, info, h, sym) 1545 bfd *output_bfd; 1546 struct bfd_link_info *info; 1547 struct elf_link_hash_entry *h; 1548 Elf_Internal_Sym *sym; 1549{ 1550 bfd *dynobj; 1551 1552 /* Where in the plt entry to put values. */ 1553 int plt_off1 = 2, plt_off2 = 10, plt_off3 = 16; 1554 1555 /* What offset to add to the distance to the first PLT entry for the 1556 value at plt_off3. */ 1557 int plt_off3_value_bias = 4; 1558 1559 /* Where in the PLT entry the call-dynlink-stub is (happens to be same 1560 for PIC and non-PIC for v32 and pre-v32). */ 1561 int plt_stub_offset = 8; 1562 int plt_entry_size = PLT_ENTRY_SIZE; 1563 const bfd_byte *plt_entry = elf_cris_plt_entry; 1564 const bfd_byte *plt_pic_entry = elf_cris_pic_plt_entry; 1565 1566 /* Adjust the various PLT entry offsets. */ 1567 if (bfd_get_mach (output_bfd) == bfd_mach_cris_v32) 1568 { 1569 plt_off2 = 14; 1570 plt_off3 = 20; 1571 plt_off3_value_bias = -2; 1572 plt_stub_offset = 12; 1573 plt_entry_size = PLT_ENTRY_SIZE_V32; 1574 plt_entry = elf_cris_plt_entry_v32; 1575 plt_pic_entry = elf_cris_pic_plt_entry_v32; 1576 } 1577 1578 dynobj = elf_hash_table (info)->dynobj; 1579 1580 if (h->plt.offset != (bfd_vma) -1) 1581 { 1582 asection *splt; 1583 asection *sgotplt; 1584 asection *sgot; 1585 asection *srela; 1586 bfd_vma got_base; 1587 1588 bfd_vma gotplt_offset 1589 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset; 1590 Elf_Internal_Rela rela; 1591 bfd_byte *loc; 1592 bfd_boolean has_gotplt = gotplt_offset != 0; 1593 1594 /* Get the index in the procedure linkage table which 1595 corresponds to this symbol. This is the index of this symbol 1596 in all the symbols for which we are making plt entries. The 1597 first entry in the procedure linkage table is reserved. */ 1598 /* We have to count backwards here, and the result is only valid as 1599 an index into .got.plt and its relocations. FIXME: Constants... */ 1600 bfd_vma gotplt_index = gotplt_offset/4 - 3; 1601 1602 /* Get the offset into the .got table of the entry that corresponds 1603 to this function. Note that we embed knowledge that "incoming" 1604 .got goes after .got.plt in the output without padding (pointer 1605 aligned). However, that knowledge is present in several other 1606 places too. */ 1607 bfd_vma got_offset 1608 = (has_gotplt 1609 ? gotplt_offset 1610 : h->got.offset + elf_cris_hash_table(info)->next_gotplt_entry); 1611 1612 /* This symbol has an entry in the procedure linkage table. Set it 1613 up. */ 1614 1615 BFD_ASSERT (h->dynindx != -1); 1616 1617 splt = bfd_get_section_by_name (dynobj, ".plt"); 1618 sgot = bfd_get_section_by_name (dynobj, ".got"); 1619 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 1620 srela = bfd_get_section_by_name (dynobj, ".rela.plt"); 1621 BFD_ASSERT (splt != NULL && sgotplt != NULL 1622 && (! has_gotplt || srela != NULL)); 1623 1624 got_base = sgotplt->output_section->vma + sgotplt->output_offset; 1625 1626 /* Fill in the entry in the procedure linkage table. */ 1627 if (! info->shared) 1628 { 1629 memcpy (splt->contents + h->plt.offset, plt_entry, 1630 plt_entry_size); 1631 1632 /* We need to enter the absolute address of the GOT entry here. */ 1633 bfd_put_32 (output_bfd, got_base + got_offset, 1634 splt->contents + h->plt.offset + plt_off1); 1635 } 1636 else 1637 { 1638 memcpy (splt->contents + h->plt.offset, plt_pic_entry, 1639 plt_entry_size); 1640 bfd_put_32 (output_bfd, got_offset, 1641 splt->contents + h->plt.offset + plt_off1); 1642 } 1643 1644 /* Fill in the plt entry and make a relocation, if this is a "real" 1645 PLT entry. */ 1646 if (has_gotplt) 1647 { 1648 /* Fill in the offset to the reloc table. */ 1649 bfd_put_32 (output_bfd, 1650 gotplt_index * sizeof (Elf32_External_Rela), 1651 splt->contents + h->plt.offset + plt_off2); 1652 1653 /* Fill in the offset to the first PLT entry, where to "jump". */ 1654 bfd_put_32 (output_bfd, 1655 - (h->plt.offset + plt_off3 + plt_off3_value_bias), 1656 splt->contents + h->plt.offset + plt_off3); 1657 1658 /* Fill in the entry in the global offset table with the address of 1659 the relocating stub. */ 1660 bfd_put_32 (output_bfd, 1661 (splt->output_section->vma 1662 + splt->output_offset 1663 + h->plt.offset 1664 + plt_stub_offset), 1665 sgotplt->contents + got_offset); 1666 1667 /* Fill in the entry in the .rela.plt section. */ 1668 rela.r_offset = (sgotplt->output_section->vma 1669 + sgotplt->output_offset 1670 + got_offset); 1671 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_JUMP_SLOT); 1672 rela.r_addend = 0; 1673 loc = srela->contents + gotplt_index * sizeof (Elf32_External_Rela); 1674 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1675 } 1676 1677 if (!h->def_regular) 1678 { 1679 /* Mark the symbol as undefined, rather than as defined in 1680 the .plt section. Leave the value alone. */ 1681 sym->st_shndx = SHN_UNDEF; 1682 1683 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't 1684 know whether resetting the value is significant; if it really 1685 is, rather than a quirk or bug in the sparc port, then I 1686 believe we'd see this elsewhere. */ 1687 /* If the symbol is weak, we do need to clear the value. 1688 Otherwise, the PLT entry would provide a definition for 1689 the symbol even if the symbol wasn't defined anywhere, 1690 and so the symbol would never be NULL. */ 1691 if (!h->ref_regular_nonweak) 1692 sym->st_value = 0; 1693 } 1694 } 1695 1696 /* For an ordinary program, we emit .got relocs only for symbols that 1697 are in the dynamic-symbols table and are either defined by the 1698 program or are undefined weak symbols, or are function symbols 1699 where we do not output a PLT: the PLT reloc was output above and all 1700 references to the function symbol are redirected to the PLT. */ 1701 if (h->got.offset != (bfd_vma) -1 1702 && (info->shared 1703 || (h->dynindx != -1 1704 && h->plt.offset == (bfd_vma) -1 1705 && !h->def_regular 1706 && h->root.type != bfd_link_hash_undefweak))) 1707 { 1708 asection *sgot; 1709 asection *srela; 1710 Elf_Internal_Rela rela; 1711 bfd_byte *loc; 1712 bfd_byte *where; 1713 1714 /* This symbol has an entry in the global offset table. Set it up. */ 1715 1716 sgot = bfd_get_section_by_name (dynobj, ".got"); 1717 srela = bfd_get_section_by_name (dynobj, ".rela.got"); 1718 BFD_ASSERT (sgot != NULL && srela != NULL); 1719 1720 rela.r_offset = (sgot->output_section->vma 1721 + sgot->output_offset 1722 + (h->got.offset &~ (bfd_vma) 1)); 1723 1724 /* If this is a static link, or it is a -Bsymbolic link and the 1725 symbol is defined locally or was forced to be local because 1726 of a version file, we just want to emit a RELATIVE reloc. 1727 The entry in the global offset table will already have been 1728 initialized in the relocate_section function. */ 1729 where = sgot->contents + (h->got.offset &~ (bfd_vma) 1); 1730 if (! elf_hash_table (info)->dynamic_sections_created 1731 || (info->shared 1732 && (info->symbolic || h->dynindx == -1) 1733 && h->def_regular)) 1734 { 1735 rela.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); 1736 rela.r_addend = bfd_get_signed_32 (output_bfd, where); 1737 } 1738 else 1739 { 1740 bfd_put_32 (output_bfd, (bfd_vma) 0, where); 1741 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_GLOB_DAT); 1742 rela.r_addend = 0; 1743 } 1744 1745 loc = srela->contents; 1746 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 1747 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1748 } 1749 1750 if (h->needs_copy) 1751 { 1752 asection *s; 1753 Elf_Internal_Rela rela; 1754 bfd_byte *loc; 1755 1756 /* This symbol needs a copy reloc. Set it up. */ 1757 1758 BFD_ASSERT (h->dynindx != -1 1759 && (h->root.type == bfd_link_hash_defined 1760 || h->root.type == bfd_link_hash_defweak)); 1761 1762 s = bfd_get_section_by_name (h->root.u.def.section->owner, 1763 ".rela.bss"); 1764 BFD_ASSERT (s != NULL); 1765 1766 rela.r_offset = (h->root.u.def.value 1767 + h->root.u.def.section->output_section->vma 1768 + h->root.u.def.section->output_offset); 1769 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_COPY); 1770 rela.r_addend = 0; 1771 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 1772 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1773 } 1774 1775 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 1776 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 1777 || h == elf_hash_table (info)->hgot) 1778 sym->st_shndx = SHN_ABS; 1779 1780 return TRUE; 1781} 1782 1783/* Finish up the dynamic sections. */ 1784 1785static bfd_boolean 1786elf_cris_finish_dynamic_sections (output_bfd, info) 1787 bfd *output_bfd; 1788 struct bfd_link_info *info; 1789{ 1790 bfd *dynobj; 1791 asection *sgot; 1792 asection *sdyn; 1793 1794 dynobj = elf_hash_table (info)->dynobj; 1795 1796 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 1797 BFD_ASSERT (sgot != NULL); 1798 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 1799 1800 if (elf_hash_table (info)->dynamic_sections_created) 1801 { 1802 asection *splt; 1803 Elf32_External_Dyn *dyncon, *dynconend; 1804 1805 splt = bfd_get_section_by_name (dynobj, ".plt"); 1806 BFD_ASSERT (splt != NULL && sdyn != NULL); 1807 1808 dyncon = (Elf32_External_Dyn *) sdyn->contents; 1809 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 1810 for (; dyncon < dynconend; dyncon++) 1811 { 1812 Elf_Internal_Dyn dyn; 1813 asection *s; 1814 1815 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 1816 1817 switch (dyn.d_tag) 1818 { 1819 default: 1820 break; 1821 1822 case DT_PLTGOT: 1823 s = bfd_get_section_by_name (output_bfd, ".got"); 1824 BFD_ASSERT (s != NULL); 1825 dyn.d_un.d_ptr = s->vma; 1826 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1827 break; 1828 1829 case DT_JMPREL: 1830 /* Yes, we *can* have a .plt and no .plt.rela, for instance 1831 if all symbols are found in the .got (not .got.plt). */ 1832 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 1833 dyn.d_un.d_ptr = s != NULL ? s->vma : 0; 1834 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1835 break; 1836 1837 case DT_PLTRELSZ: 1838 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 1839 if (s == NULL) 1840 dyn.d_un.d_val = 0; 1841 else 1842 dyn.d_un.d_val = s->size; 1843 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1844 break; 1845 1846 case DT_RELASZ: 1847 /* The procedure linkage table relocs (DT_JMPREL) should 1848 not be included in the overall relocs (DT_RELA). 1849 Therefore, we override the DT_RELASZ entry here to 1850 make it not include the JMPREL relocs. Since the 1851 linker script arranges for .rela.plt to follow all 1852 other relocation sections, we don't have to worry 1853 about changing the DT_RELA entry. */ 1854 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 1855 if (s != NULL) 1856 dyn.d_un.d_val -= s->size; 1857 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1858 break; 1859 } 1860 } 1861 1862 /* Fill in the first entry in the procedure linkage table. */ 1863 if (splt->size > 0) 1864 { 1865 if (bfd_get_mach (output_bfd) == bfd_mach_cris_v32) 1866 { 1867 if (info->shared) 1868 memcpy (splt->contents, elf_cris_pic_plt0_entry_v32, 1869 PLT_ENTRY_SIZE_V32); 1870 else 1871 { 1872 memcpy (splt->contents, elf_cris_plt0_entry_v32, 1873 PLT_ENTRY_SIZE_V32); 1874 bfd_put_32 (output_bfd, 1875 sgot->output_section->vma 1876 + sgot->output_offset + 4, 1877 splt->contents + 4); 1878 1879 elf_section_data (splt->output_section)->this_hdr.sh_entsize 1880 = PLT_ENTRY_SIZE_V32; 1881 } 1882 } 1883 else 1884 { 1885 if (info->shared) 1886 memcpy (splt->contents, elf_cris_pic_plt0_entry, 1887 PLT_ENTRY_SIZE); 1888 else 1889 { 1890 memcpy (splt->contents, elf_cris_plt0_entry, 1891 PLT_ENTRY_SIZE); 1892 bfd_put_32 (output_bfd, 1893 sgot->output_section->vma 1894 + sgot->output_offset + 4, 1895 splt->contents + 6); 1896 bfd_put_32 (output_bfd, 1897 sgot->output_section->vma 1898 + sgot->output_offset + 8, 1899 splt->contents + 14); 1900 1901 elf_section_data (splt->output_section)->this_hdr.sh_entsize 1902 = PLT_ENTRY_SIZE; 1903 } 1904 } 1905 } 1906 } 1907 1908 /* Fill in the first three entries in the global offset table. */ 1909 if (sgot->size > 0) 1910 { 1911 if (sdyn == NULL) 1912 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 1913 else 1914 bfd_put_32 (output_bfd, 1915 sdyn->output_section->vma + sdyn->output_offset, 1916 sgot->contents); 1917 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 1918 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 1919 } 1920 1921 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 1922 1923 return TRUE; 1924} 1925 1926/* Return the section that should be marked against GC for a given 1927 relocation. */ 1928 1929static asection * 1930cris_elf_gc_mark_hook (asection *sec, 1931 struct bfd_link_info *info, 1932 Elf_Internal_Rela *rel, 1933 struct elf_link_hash_entry *h, 1934 Elf_Internal_Sym *sym) 1935{ 1936 if (h != NULL) 1937 switch (ELF32_R_TYPE (rel->r_info)) 1938 { 1939 case R_CRIS_GNU_VTINHERIT: 1940 case R_CRIS_GNU_VTENTRY: 1941 return NULL; 1942 } 1943 1944 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1945} 1946 1947/* Update the got entry reference counts for the section being removed. */ 1948 1949static bfd_boolean 1950cris_elf_gc_sweep_hook (bfd *abfd, 1951 struct bfd_link_info *info, 1952 asection *sec, 1953 const Elf_Internal_Rela *relocs) 1954{ 1955 Elf_Internal_Shdr *symtab_hdr; 1956 struct elf_link_hash_entry **sym_hashes; 1957 bfd_signed_vma *local_got_refcounts; 1958 const Elf_Internal_Rela *rel, *relend; 1959 bfd *dynobj; 1960 asection *sgot; 1961 asection *srelgot; 1962 1963 dynobj = elf_hash_table (info)->dynobj; 1964 if (dynobj == NULL) 1965 return TRUE; 1966 1967 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1968 sym_hashes = elf_sym_hashes (abfd); 1969 local_got_refcounts = elf_local_got_refcounts (abfd); 1970 1971 sgot = bfd_get_section_by_name (dynobj, ".got"); 1972 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 1973 1974 relend = relocs + sec->reloc_count; 1975 for (rel = relocs; rel < relend; rel++) 1976 { 1977 unsigned long r_symndx; 1978 struct elf_link_hash_entry *h = NULL; 1979 1980 r_symndx = ELF32_R_SYM (rel->r_info); 1981 if (r_symndx >= symtab_hdr->sh_info) 1982 { 1983 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1984 while (h->root.type == bfd_link_hash_indirect 1985 || h->root.type == bfd_link_hash_warning) 1986 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1987 } 1988 1989 switch (ELF32_R_TYPE (rel->r_info)) 1990 { 1991 case R_CRIS_16_GOT: 1992 case R_CRIS_32_GOT: 1993 if (h != NULL) 1994 { 1995 if (h->got.refcount > 0) 1996 { 1997 --h->got.refcount; 1998 if (h->got.refcount == 0) 1999 { 2000 /* We don't need the .got entry any more. */ 2001 sgot->size -= 4; 2002 srelgot->size -= sizeof (Elf32_External_Rela); 2003 } 2004 } 2005 break; 2006 } 2007 2008 local_got_reloc: 2009 if (local_got_refcounts != NULL) 2010 { 2011 if (local_got_refcounts[r_symndx] > 0) 2012 { 2013 --local_got_refcounts[r_symndx]; 2014 if (local_got_refcounts[r_symndx] == 0) 2015 { 2016 /* We don't need the .got entry any more. */ 2017 sgot->size -= 4; 2018 if (info->shared) 2019 srelgot->size -= sizeof (Elf32_External_Rela); 2020 } 2021 } 2022 } 2023 break; 2024 2025 case R_CRIS_16_GOTPLT: 2026 case R_CRIS_32_GOTPLT: 2027 /* For local symbols, treat these like GOT relocs. */ 2028 if (h == NULL) 2029 goto local_got_reloc; 2030 /* Fall through. */ 2031 2032 case R_CRIS_32_PLT_GOTREL: 2033 /* FIXME: We don't garbage-collect away the .got section. */ 2034 if (local_got_refcounts != NULL) 2035 local_got_refcounts[-1]--; 2036 /* Fall through. */ 2037 2038 case R_CRIS_8_PCREL: 2039 case R_CRIS_16_PCREL: 2040 case R_CRIS_32_PCREL: 2041 case R_CRIS_32_PLT_PCREL: 2042 if (h != NULL) 2043 { 2044 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2045 && h->plt.refcount > 0) 2046 --h->plt.refcount; 2047 } 2048 break; 2049 2050 default: 2051 break; 2052 } 2053 } 2054 2055 return TRUE; 2056} 2057 2058/* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 2059 entry but we found we will not create any. Called when we find we will 2060 not have any PLT for this symbol, by for example 2061 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link, 2062 or elf_cris_size_dynamic_sections if no dynamic sections will be 2063 created (we're only linking static objects). */ 2064 2065static bfd_boolean 2066elf_cris_adjust_gotplt_to_got (h, p) 2067 struct elf_cris_link_hash_entry *h; 2068 PTR p; 2069{ 2070 struct bfd_link_info *info = (struct bfd_link_info *) p; 2071 2072 if (h->root.root.type == bfd_link_hash_warning) 2073 h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link; 2074 2075 /* If nobody wanted a GOTPLT with this symbol, we're done. */ 2076 if (h->gotplt_refcount <= 0) 2077 return TRUE; 2078 2079 if (h->root.got.refcount > 0) 2080 { 2081 /* There's a GOT entry for this symbol. Just adjust the refcount. 2082 Probably not necessary at this stage, but keeping it accurate 2083 helps avoiding surprises later. */ 2084 h->root.got.refcount += h->gotplt_refcount; 2085 h->gotplt_refcount = 0; 2086 } 2087 else 2088 { 2089 /* No GOT entry for this symbol. We need to create one. */ 2090 bfd *dynobj = elf_hash_table (info)->dynobj; 2091 asection *sgot; 2092 asection *srelgot; 2093 2094 BFD_ASSERT (dynobj != NULL); 2095 sgot = bfd_get_section_by_name (dynobj, ".got"); 2096 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 2097 2098 /* Put an accurate refcount there. */ 2099 h->root.got.refcount = h->gotplt_refcount; 2100 2101 h->gotplt_refcount = 0; 2102 2103 /* We always have a .got and a .rela.got section if there were 2104 GOTPLT relocs in input. */ 2105 BFD_ASSERT (sgot != NULL && srelgot != NULL); 2106 2107 /* Allocate space in the .got section. */ 2108 sgot->size += 4; 2109 2110 /* Allocate relocation space. */ 2111 srelgot->size += sizeof (Elf32_External_Rela); 2112 } 2113 2114 return TRUE; 2115} 2116 2117/* Try to fold PLT entries with GOT entries. There are two cases when we 2118 want to do this: 2119 2120 - When all PLT references are GOTPLT references, and there are GOT 2121 references, and this is not the executable. We don't have to 2122 generate a PLT at all. 2123 2124 - When there are both (ordinary) PLT references and GOT references, 2125 and this isn't the executable. 2126 We want to make the PLT reference use the ordinary GOT entry rather 2127 than R_CRIS_JUMP_SLOT, a run-time dynamically resolved GOTPLT entry, 2128 since the GOT entry will have to be resolved at startup anyway. 2129 2130 Though the latter case is handled when room for the PLT is allocated, 2131 not here. 2132 2133 By folding into the GOT, we may need a round-trip to a PLT in the 2134 executable for calls, a loss in performance. Still, losing a 2135 reloc is a win in size and at least in start-up time. 2136 2137 Note that this function is called before symbols are forced local by 2138 version scripts. The differing cases are handled by 2139 elf_cris_hide_symbol. */ 2140 2141static bfd_boolean 2142elf_cris_try_fold_plt_to_got (h, p) 2143 struct elf_cris_link_hash_entry *h; 2144 PTR p; 2145{ 2146 struct bfd_link_info *info = (struct bfd_link_info *) p; 2147 2148 /* If there are no GOT references for this symbol, we can't fold any 2149 other reference so there's nothing to do. Likewise if there are no 2150 PLT references; GOTPLT references included. */ 2151 if (h->root.got.refcount <= 0 || h->root.plt.refcount <= 0) 2152 return TRUE; 2153 2154 /* GOTPLT relocs are supposed to be included into the PLT refcount. */ 2155 BFD_ASSERT (h->gotplt_refcount <= h->root.plt.refcount); 2156 2157 if (h->gotplt_refcount == h->root.plt.refcount) 2158 { 2159 /* The only PLT references are GOTPLT references, and there are GOT 2160 references. Convert PLT to GOT references. */ 2161 if (! elf_cris_adjust_gotplt_to_got (h, info)) 2162 return FALSE; 2163 2164 /* Clear the PLT references, so no PLT will be created. */ 2165 h->root.plt.offset = (bfd_vma) -1; 2166 } 2167 2168 return TRUE; 2169} 2170 2171/* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc 2172 to use a GOT entry (and create one) rather than requiring a GOTPLT 2173 entry. */ 2174 2175static void 2176elf_cris_hide_symbol (info, h, force_local) 2177 struct bfd_link_info *info; 2178 struct elf_link_hash_entry *h; 2179 bfd_boolean force_local; 2180{ 2181 elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info); 2182 2183 _bfd_elf_link_hash_hide_symbol (info, h, force_local); 2184} 2185 2186/* Adjust a symbol defined by a dynamic object and referenced by a 2187 regular object. The current definition is in some section of the 2188 dynamic object, but we're not including those sections. We have to 2189 change the definition to something the rest of the link can 2190 understand. */ 2191 2192static bfd_boolean 2193elf_cris_adjust_dynamic_symbol (info, h) 2194 struct bfd_link_info *info; 2195 struct elf_link_hash_entry *h; 2196{ 2197 bfd *dynobj; 2198 asection *s; 2199 unsigned int power_of_two; 2200 bfd_size_type plt_entry_size; 2201 2202 dynobj = elf_hash_table (info)->dynobj; 2203 2204 /* Make sure we know what is going on here. */ 2205 BFD_ASSERT (dynobj != NULL 2206 && (h->needs_plt 2207 || h->u.weakdef != NULL 2208 || (h->def_dynamic 2209 && h->ref_regular 2210 && !h->def_regular))); 2211 2212 plt_entry_size 2213 = (bfd_get_mach (dynobj) == bfd_mach_cris_v32 2214 ? PLT_ENTRY_SIZE_V32 : PLT_ENTRY_SIZE); 2215 2216 /* If this is a function, put it in the procedure linkage table. We 2217 will fill in the contents of the procedure linkage table later, 2218 when we know the address of the .got section. */ 2219 if (h->type == STT_FUNC 2220 || h->needs_plt) 2221 { 2222 /* If we link a program (not a DSO), we'll get rid of unnecessary 2223 PLT entries; we point to the actual symbols -- even for pic 2224 relocs, because a program built with -fpic should have the same 2225 result as one built without -fpic, specifically considering weak 2226 symbols. 2227 FIXME: m68k and i386 differ here, for unclear reasons. */ 2228 if (! info->shared 2229 && !h->def_dynamic) 2230 { 2231 /* This case can occur if we saw a PLT reloc in an input file, 2232 but the symbol was not defined by a dynamic object. In such 2233 a case, we don't actually need to build a procedure linkage 2234 table, and we can just do an absolute or PC reloc instead, or 2235 change a .got.plt index to a .got index for GOTPLT relocs. */ 2236 BFD_ASSERT (h->needs_plt); 2237 h->needs_plt = 0; 2238 h->plt.offset = (bfd_vma) -1; 2239 return 2240 elf_cris_adjust_gotplt_to_got ((struct 2241 elf_cris_link_hash_entry *) h, 2242 info); 2243 } 2244 2245 /* If we had a R_CRIS_GLOB_DAT that didn't have to point to a PLT; 2246 where a pointer-equivalent symbol was unimportant (i.e. more 2247 like R_CRIS_JUMP_SLOT after symbol evaluation) we could get rid 2248 of the PLT. We can't for the executable, because the GOT 2249 entries will point to the PLT there (and be constant). */ 2250 if (info->shared 2251 && !elf_cris_try_fold_plt_to_got ((struct elf_cris_link_hash_entry*) 2252 h, info)) 2253 return FALSE; 2254 2255 /* GC or folding may have rendered this entry unused. */ 2256 if (h->plt.refcount <= 0) 2257 { 2258 h->needs_plt = 0; 2259 h->plt.offset = (bfd_vma) -1; 2260 return TRUE; 2261 } 2262 2263 /* Make sure this symbol is output as a dynamic symbol. */ 2264 if (h->dynindx == -1) 2265 { 2266 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2267 return FALSE; 2268 } 2269 2270 s = bfd_get_section_by_name (dynobj, ".plt"); 2271 BFD_ASSERT (s != NULL); 2272 2273 /* If this is the first .plt entry, make room for the special 2274 first entry. */ 2275 if (s->size == 0) 2276 s->size += plt_entry_size; 2277 2278 /* If this symbol is not defined in a regular file, and we are 2279 not generating a shared library, then set the symbol to this 2280 location in the .plt. */ 2281 if (!info->shared 2282 && !h->def_regular) 2283 { 2284 h->root.u.def.section = s; 2285 h->root.u.def.value = s->size; 2286 } 2287 2288 /* If there's already a GOT entry, use that, not a .got.plt. A 2289 GOT field still has a reference count when we get here; it's 2290 not yet changed to an offset. We can't do this for an 2291 executable, because then the reloc associated with the PLT 2292 would get a non-PLT reloc pointing to the PLT. FIXME: Move 2293 this to elf_cris_try_fold_plt_to_got. */ 2294 if (info->shared && h->got.refcount > 0) 2295 { 2296 h->got.refcount += h->plt.refcount; 2297 2298 /* Mark the PLT offset to use the GOT entry by setting the low 2299 bit in the plt offset; it is always a multiple of 2300 plt_entry_size (which is at least a multiple of 2). */ 2301 BFD_ASSERT ((s->size % plt_entry_size) == 0); 2302 2303 /* Change the PLT refcount to an offset. */ 2304 h->plt.offset = s->size; 2305 2306 /* By not setting gotplt_offset (i.e. it remains at 0), we signal 2307 that the got entry should be used instead. */ 2308 BFD_ASSERT (((struct elf_cris_link_hash_entry *) 2309 h)->gotplt_offset == 0); 2310 2311 /* Make room for this entry. */ 2312 s->size += plt_entry_size; 2313 2314 return TRUE; 2315 } 2316 2317 /* No GOT reference for this symbol; prepare for an ordinary PLT. */ 2318 h->plt.offset = s->size; 2319 2320 /* Make room for this entry. */ 2321 s->size += plt_entry_size; 2322 2323 /* We also need to make an entry in the .got.plt section, which 2324 will be placed in the .got section by the linker script. */ 2325 ((struct elf_cris_link_hash_entry *) h)->gotplt_offset 2326 = elf_cris_hash_table (info)->next_gotplt_entry; 2327 elf_cris_hash_table (info)->next_gotplt_entry += 4; 2328 2329 s = bfd_get_section_by_name (dynobj, ".got.plt"); 2330 BFD_ASSERT (s != NULL); 2331 s->size += 4; 2332 2333 /* We also need to make an entry in the .rela.plt section. */ 2334 2335 s = bfd_get_section_by_name (dynobj, ".rela.plt"); 2336 BFD_ASSERT (s != NULL); 2337 s->size += sizeof (Elf32_External_Rela); 2338 2339 return TRUE; 2340 } 2341 2342 /* Reinitialize the plt offset now that it is not used as a reference 2343 count any more. */ 2344 h->plt.offset = (bfd_vma) -1; 2345 2346 /* If this is a weak symbol, and there is a real definition, the 2347 processor independent code will have arranged for us to see the 2348 real definition first, and we can just use the same value. */ 2349 if (h->u.weakdef != NULL) 2350 { 2351 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 2352 || h->u.weakdef->root.type == bfd_link_hash_defweak); 2353 h->root.u.def.section = h->u.weakdef->root.u.def.section; 2354 h->root.u.def.value = h->u.weakdef->root.u.def.value; 2355 return TRUE; 2356 } 2357 2358 /* This is a reference to a symbol defined by a dynamic object which 2359 is not a function. */ 2360 2361 /* If we are creating a shared library, we must presume that the 2362 only references to the symbol are via the global offset table. 2363 For such cases we need not do anything here; the relocations will 2364 be handled correctly by relocate_section. */ 2365 if (info->shared) 2366 return TRUE; 2367 2368 /* If there are no references to this symbol that do not use the 2369 GOT, we don't need to generate a copy reloc. */ 2370 if (!h->non_got_ref) 2371 return TRUE; 2372 2373 if (h->size == 0) 2374 { 2375 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 2376 h->root.root.string); 2377 return TRUE; 2378 } 2379 2380 /* We must allocate the symbol in our .dynbss section, which will 2381 become part of the .bss section of the executable. There will be 2382 an entry for this symbol in the .dynsym section. The dynamic 2383 object will contain position independent code, so all references 2384 from the dynamic object to this symbol will go through the global 2385 offset table. The dynamic linker will use the .dynsym entry to 2386 determine the address it must put in the global offset table, so 2387 both the dynamic object and the regular object will refer to the 2388 same memory location for the variable. */ 2389 2390 s = bfd_get_section_by_name (dynobj, ".dynbss"); 2391 BFD_ASSERT (s != NULL); 2392 2393 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to 2394 copy the initial value out of the dynamic object and into the 2395 runtime process image. We need to remember the offset into the 2396 .rela.bss section we are going to use. */ 2397 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 2398 { 2399 asection *srel; 2400 2401 srel = bfd_get_section_by_name (dynobj, ".rela.bss"); 2402 BFD_ASSERT (srel != NULL); 2403 srel->size += sizeof (Elf32_External_Rela); 2404 h->needs_copy = 1; 2405 } 2406 2407 /* Historic precedent: m68k and i386 allow max 8-byte alignment for the 2408 thing to copy; so do we. */ 2409 2410 /* We need to figure out the alignment required for this symbol. I 2411 have no idea how ELF linkers handle this. */ 2412 power_of_two = bfd_log2 (h->size); 2413 if (power_of_two > 3) 2414 power_of_two = 3; 2415 2416 /* Apply the required alignment. */ 2417 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 2418 if (power_of_two > bfd_get_section_alignment (dynobj, s)) 2419 { 2420 if (!bfd_set_section_alignment (dynobj, s, power_of_two)) 2421 return FALSE; 2422 } 2423 2424 /* Define the symbol as being at this point in the section. */ 2425 h->root.u.def.section = s; 2426 h->root.u.def.value = s->size; 2427 2428 /* Increment the section size to make room for the symbol. */ 2429 s->size += h->size; 2430 2431 return TRUE; 2432} 2433 2434/* Look through the relocs for a section during the first phase. */ 2435 2436static bfd_boolean 2437cris_elf_check_relocs (abfd, info, sec, relocs) 2438 bfd *abfd; 2439 struct bfd_link_info *info; 2440 asection *sec; 2441 const Elf_Internal_Rela *relocs; 2442{ 2443 bfd *dynobj; 2444 Elf_Internal_Shdr *symtab_hdr; 2445 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 2446 bfd_signed_vma *local_got_refcounts; 2447 const Elf_Internal_Rela *rel; 2448 const Elf_Internal_Rela *rel_end; 2449 asection *sgot; 2450 asection *srelgot; 2451 asection *sreloc; 2452 2453 if (info->relocatable) 2454 return TRUE; 2455 2456 dynobj = elf_hash_table (info)->dynobj; 2457 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2458 sym_hashes = elf_sym_hashes (abfd); 2459 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); 2460 local_got_refcounts = elf_local_got_refcounts (abfd); 2461 2462 sgot = NULL; 2463 srelgot = NULL; 2464 sreloc = NULL; 2465 2466 if (!elf_bad_symtab (abfd)) 2467 sym_hashes_end -= symtab_hdr->sh_info; 2468 2469 rel_end = relocs + sec->reloc_count; 2470 for (rel = relocs; rel < rel_end; rel++) 2471 { 2472 struct elf_link_hash_entry *h; 2473 unsigned long r_symndx; 2474 enum elf_cris_reloc_type r_type; 2475 2476 r_symndx = ELF32_R_SYM (rel->r_info); 2477 if (r_symndx < symtab_hdr->sh_info) 2478 h = NULL; 2479 else 2480 { 2481 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2482 while (h->root.type == bfd_link_hash_indirect 2483 || h->root.type == bfd_link_hash_warning) 2484 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2485 } 2486 2487 r_type = ELF32_R_TYPE (rel->r_info); 2488 2489 /* Some relocs require linker-created sections; we need to hang them 2490 on the first input bfd we found that contained dynamic relocs. */ 2491 switch (r_type) 2492 { 2493 case R_CRIS_16_GOT: 2494 case R_CRIS_32_GOT: 2495 case R_CRIS_32_GOTREL: 2496 case R_CRIS_32_PLT_GOTREL: 2497 case R_CRIS_32_PLT_PCREL: 2498 case R_CRIS_16_GOTPLT: 2499 case R_CRIS_32_GOTPLT: 2500 if (dynobj == NULL) 2501 { 2502 elf_hash_table (info)->dynobj = dynobj = abfd; 2503 2504 /* We could handle this if we can get a handle on the 2505 output bfd in elf_cris_adjust_dynamic_symbol. Failing 2506 that, we must insist on dynobj being a specific mach. */ 2507 if (bfd_get_mach (dynobj) == bfd_mach_cris_v10_v32) 2508 { 2509 (*_bfd_error_handler) 2510 (_("%B, section %A:\n v10/v32 compatible object %s" 2511 " must not contain a PIC relocation"), 2512 abfd, sec); 2513 return FALSE; 2514 } 2515 2516 /* Create the .got section, so we can assume it's always 2517 present whenever there's a dynobj. */ 2518 if (!_bfd_elf_create_got_section (dynobj, info)) 2519 return FALSE; 2520 } 2521 break; 2522 2523 default: 2524 break; 2525 } 2526 2527 /* Some relocs require a global offset table (but perhaps not a 2528 specific GOT entry). */ 2529 switch (r_type) 2530 { 2531 /* For R_CRIS_16_GOTPLT and R_CRIS_32_GOTPLT, we need a GOT 2532 entry only for local symbols. Unfortunately, we don't know 2533 until later on if there's a version script that forces the 2534 symbol local. We must have the .rela.got section in place 2535 before we know if the symbol looks global now, so we need 2536 to treat the reloc just like for R_CRIS_16_GOT and 2537 R_CRIS_32_GOT. */ 2538 case R_CRIS_16_GOTPLT: 2539 case R_CRIS_32_GOTPLT: 2540 case R_CRIS_16_GOT: 2541 case R_CRIS_32_GOT: 2542 if (srelgot == NULL 2543 && (h != NULL || info->shared)) 2544 { 2545 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 2546 if (srelgot == NULL) 2547 { 2548 srelgot = bfd_make_section_with_flags (dynobj, 2549 ".rela.got", 2550 (SEC_ALLOC 2551 | SEC_LOAD 2552 | SEC_HAS_CONTENTS 2553 | SEC_IN_MEMORY 2554 | SEC_LINKER_CREATED 2555 | SEC_READONLY)); 2556 if (srelgot == NULL 2557 || !bfd_set_section_alignment (dynobj, srelgot, 2)) 2558 return FALSE; 2559 } 2560 } 2561 /* Fall through. */ 2562 2563 case R_CRIS_32_GOTREL: 2564 case R_CRIS_32_PLT_GOTREL: 2565 if (sgot == NULL) 2566 sgot = bfd_get_section_by_name (dynobj, ".got"); 2567 2568 if (local_got_refcounts == NULL) 2569 { 2570 bfd_size_type amt; 2571 2572 /* We use index local_got_refcounts[-1] to count all 2573 GOT-relative relocations that do not have explicit 2574 GOT entries. */ 2575 amt = symtab_hdr->sh_info + 1; 2576 amt *= sizeof (bfd_signed_vma); 2577 local_got_refcounts = ((bfd_signed_vma *) bfd_zalloc (abfd, amt)); 2578 if (local_got_refcounts == NULL) 2579 return FALSE; 2580 2581 local_got_refcounts++; 2582 elf_local_got_refcounts (abfd) = local_got_refcounts; 2583 } 2584 break; 2585 2586 default: 2587 break; 2588 } 2589 2590 switch (r_type) 2591 { 2592 case R_CRIS_16_GOTPLT: 2593 case R_CRIS_32_GOTPLT: 2594 /* Mark that we need a GOT entry if the PLT entry (and its GOT 2595 entry) is eliminated. We can only do this for a non-local 2596 symbol. */ 2597 if (h != NULL) 2598 { 2599 ((struct elf_cris_link_hash_entry *) h)->gotplt_refcount++; 2600 goto handle_gotplt_reloc; 2601 } 2602 /* If h is NULL then this is a local symbol, and we must make a 2603 GOT entry for it, so handle it like a GOT reloc. */ 2604 /* Fall through. */ 2605 2606 case R_CRIS_16_GOT: 2607 case R_CRIS_32_GOT: 2608 /* This symbol requires a global offset table entry. */ 2609 if (h != NULL) 2610 { 2611 if (h->got.refcount == 0) 2612 { 2613 /* Make sure this symbol is output as a dynamic symbol. */ 2614 if (h->dynindx == -1) 2615 { 2616 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2617 return FALSE; 2618 } 2619 2620 /* Allocate space in the .got section. */ 2621 sgot->size += 4; 2622 /* Allocate relocation space. */ 2623 srelgot->size += sizeof (Elf32_External_Rela); 2624 } 2625 h->got.refcount++; 2626 } 2627 else 2628 { 2629 /* This is a global offset table entry for a local symbol. */ 2630 if (local_got_refcounts[r_symndx] == 0) 2631 { 2632 sgot->size += 4; 2633 if (info->shared) 2634 { 2635 /* If we are generating a shared object, we need to 2636 output a R_CRIS_RELATIVE reloc so that the dynamic 2637 linker can adjust this GOT entry. */ 2638 srelgot->size += sizeof (Elf32_External_Rela); 2639 } 2640 } 2641 local_got_refcounts[r_symndx]++; 2642 } 2643 break; 2644 2645 case R_CRIS_32_GOTREL: 2646 /* This reference requires a global offset table. 2647 FIXME: The actual refcount isn't used currently; the .got 2648 section can't be removed if there were any references in the 2649 input. */ 2650 local_got_refcounts[-1]++; 2651 break; 2652 2653 handle_gotplt_reloc: 2654 2655 case R_CRIS_32_PLT_GOTREL: 2656 /* This reference requires a global offset table. */ 2657 local_got_refcounts[-1]++; 2658 /* Fall through. */ 2659 2660 case R_CRIS_32_PLT_PCREL: 2661 /* This symbol requires a procedure linkage table entry. We 2662 actually build the entry in adjust_dynamic_symbol, 2663 because this might be a case of linking PIC code which is 2664 never referenced by a dynamic object, in which case we 2665 don't need to generate a procedure linkage table entry 2666 after all. */ 2667 2668 /* Beware: if we'd check for visibility of the symbol here 2669 (and not marking the need for a PLT when non-visible), we'd 2670 get into trouble with keeping handling consistent with 2671 regards to relocs found before definition and GOTPLT 2672 handling. Eliminable PLT entries will be dealt with later 2673 anyway. */ 2674 if (h == NULL) 2675 continue; 2676 2677 h->needs_plt = 1; 2678 h->plt.refcount++; 2679 break; 2680 2681 case R_CRIS_8: 2682 case R_CRIS_16: 2683 case R_CRIS_32: 2684 /* Let's help debug shared library creation. Any of these 2685 relocs can be used in shared libs, but pages containing them 2686 cannot be shared. Don't warn for sections we don't care 2687 about, such as debug sections or non-constant sections. We 2688 can't help tables of (global) function pointers, for example, 2689 though they must be emitted in a data section to avoid having 2690 impure text sections. */ 2691 if (info->shared 2692 && (sec->flags & SEC_ALLOC) != 0 2693 && (sec->flags & SEC_READONLY) != 0) 2694 { 2695 /* FIXME: How do we make this optionally a warning only? */ 2696 (*_bfd_error_handler) 2697 (_("%B, section %A:\n relocation %s should not" 2698 " be used in a shared object; recompile with -fPIC"), 2699 abfd, 2700 sec, 2701 cris_elf_howto_table[r_type].name); 2702 } 2703 /* Fall through. */ 2704 2705 case R_CRIS_8_PCREL: 2706 case R_CRIS_16_PCREL: 2707 case R_CRIS_32_PCREL: 2708 if (h != NULL) 2709 { 2710 h->non_got_ref = 1; 2711 2712 /* Make sure a plt entry is created for this symbol if it 2713 turns out to be a function defined by a dynamic object. */ 2714 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) 2715 h->plt.refcount++; 2716 } 2717 2718 /* If we are creating a shared library and this is not a local 2719 symbol, we need to copy the reloc into the shared library. 2720 However when linking with -Bsymbolic and this is a global 2721 symbol which is defined in an object we are including in the 2722 link (i.e., DEF_REGULAR is set), then we can resolve the 2723 reloc directly. At this point we have not seen all the input 2724 files, so it is possible that DEF_REGULAR is not set now but 2725 will be set later (it is never cleared). In case of a weak 2726 definition, DEF_REGULAR may be cleared later by a strong 2727 definition in a shared library. We account for that 2728 possibility below by storing information in the relocs_copied 2729 field of the hash table entry. A similar situation occurs 2730 when creating shared libraries and symbol visibility changes 2731 render the symbol local. */ 2732 2733 /* No need to do anything if we're not creating a shared object. */ 2734 if (! info->shared) 2735 break; 2736 2737 /* We don't need to handle relocs into sections not going into 2738 the "real" output. */ 2739 if ((sec->flags & SEC_ALLOC) == 0) 2740 break; 2741 2742 /* We can only eliminate PC-relative relocs. */ 2743 if (r_type == R_CRIS_8_PCREL 2744 || r_type == R_CRIS_16_PCREL 2745 || r_type == R_CRIS_32_PCREL) 2746 { 2747 /* If the symbol is local, then we can eliminate the reloc. */ 2748 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 2749 break; 2750 2751 /* If this is with -Bsymbolic and the symbol isn't weak, and 2752 is defined by an ordinary object (the ones we include in 2753 this shared library) then we can also eliminate the 2754 reloc. See comment above for more eliminable cases which 2755 we can't identify at this time. */ 2756 if (info->symbolic 2757 && h->root.type != bfd_link_hash_defweak 2758 && h->def_regular) 2759 break; 2760 2761 if ((sec->flags & SEC_READONLY) != 0) 2762 { 2763 /* FIXME: How do we make this optionally a warning only? */ 2764 (*_bfd_error_handler) 2765 (_("%B, section %A:\n relocation %s should not be used" 2766 " in a shared object; recompile with -fPIC"), 2767 abfd, 2768 sec, 2769 cris_elf_howto_table[r_type].name); 2770 } 2771 } 2772 2773 /* We create a reloc section in dynobj and make room for this 2774 reloc. */ 2775 if (sreloc == NULL) 2776 { 2777 const char *name; 2778 2779 name = (bfd_elf_string_from_elf_section 2780 (abfd, 2781 elf_elfheader (abfd)->e_shstrndx, 2782 elf_section_data (sec)->rel_hdr.sh_name)); 2783 if (name == NULL) 2784 return FALSE; 2785 2786 BFD_ASSERT (CONST_STRNEQ (name, ".rela") 2787 && strcmp (bfd_get_section_name (abfd, sec), 2788 name + 5) == 0); 2789 2790 sreloc = bfd_get_section_by_name (dynobj, name); 2791 if (sreloc == NULL) 2792 { 2793 sreloc = bfd_make_section_with_flags (dynobj, name, 2794 (SEC_ALLOC 2795 | SEC_LOAD 2796 | SEC_HAS_CONTENTS 2797 | SEC_IN_MEMORY 2798 | SEC_LINKER_CREATED 2799 | SEC_READONLY)); 2800 if (sreloc == NULL 2801 || !bfd_set_section_alignment (dynobj, sreloc, 2)) 2802 return FALSE; 2803 } 2804 if (sec->flags & SEC_READONLY) 2805 info->flags |= DF_TEXTREL; 2806 } 2807 2808 sreloc->size += sizeof (Elf32_External_Rela); 2809 2810 /* If we are linking with -Bsymbolic, we count the number of PC 2811 relative relocations we have entered for this symbol, so that 2812 we can discard them again if the symbol is later defined by a 2813 regular object. We know that h is really a pointer to an 2814 elf_cris_link_hash_entry. */ 2815 if ((r_type == R_CRIS_8_PCREL 2816 || r_type == R_CRIS_16_PCREL 2817 || r_type == R_CRIS_32_PCREL) 2818 && info->symbolic) 2819 { 2820 struct elf_cris_link_hash_entry *eh; 2821 struct elf_cris_pcrel_relocs_copied *p; 2822 2823 eh = (struct elf_cris_link_hash_entry *) h; 2824 2825 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) 2826 if (p->section == sreloc) 2827 break; 2828 2829 if (p == NULL) 2830 { 2831 p = ((struct elf_cris_pcrel_relocs_copied *) 2832 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 2833 if (p == NULL) 2834 return FALSE; 2835 p->next = eh->pcrel_relocs_copied; 2836 eh->pcrel_relocs_copied = p; 2837 p->section = sreloc; 2838 p->count = 0; 2839 } 2840 2841 ++p->count; 2842 } 2843 break; 2844 2845 /* This relocation describes the C++ object vtable hierarchy. 2846 Reconstruct it for later use during GC. */ 2847 case R_CRIS_GNU_VTINHERIT: 2848 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2849 return FALSE; 2850 break; 2851 2852 /* This relocation describes which C++ vtable entries are actually 2853 used. Record for later use during GC. */ 2854 case R_CRIS_GNU_VTENTRY: 2855 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2856 return FALSE; 2857 break; 2858 2859 default: 2860 /* Other relocs do not appear here. */ 2861 bfd_set_error (bfd_error_bad_value); 2862 return FALSE; 2863 } 2864 } 2865 2866 return TRUE; 2867} 2868 2869/* Set the sizes of the dynamic sections. */ 2870 2871static bfd_boolean 2872elf_cris_size_dynamic_sections (output_bfd, info) 2873 bfd *output_bfd ATTRIBUTE_UNUSED; 2874 struct bfd_link_info *info; 2875{ 2876 bfd *dynobj; 2877 asection *s; 2878 bfd_boolean plt; 2879 bfd_boolean relocs; 2880 2881 dynobj = elf_hash_table (info)->dynobj; 2882 BFD_ASSERT (dynobj != NULL); 2883 2884 if (elf_hash_table (info)->dynamic_sections_created) 2885 { 2886 /* Set the contents of the .interp section to the interpreter. */ 2887 if (info->executable) 2888 { 2889 s = bfd_get_section_by_name (dynobj, ".interp"); 2890 BFD_ASSERT (s != NULL); 2891 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2892 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2893 } 2894 } 2895 else 2896 { 2897 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */ 2898 elf_cris_link_hash_traverse (elf_cris_hash_table (info), 2899 elf_cris_adjust_gotplt_to_got, 2900 (PTR) info); 2901 2902 /* We may have created entries in the .rela.got section. 2903 However, if we are not creating the dynamic sections, we will 2904 not actually use these entries. Reset the size of .rela.got, 2905 which will cause it to get stripped from the output file 2906 below. */ 2907 s = bfd_get_section_by_name (dynobj, ".rela.got"); 2908 if (s != NULL) 2909 s->size = 0; 2910 } 2911 2912 /* If this is a -Bsymbolic shared link, then we need to discard all PC 2913 relative relocs against symbols defined in a regular object. We 2914 allocated space for them in the check_relocs routine, but we will not 2915 fill them in in the relocate_section routine. We also discard space 2916 for relocs that have become for local symbols due to symbol 2917 visibility changes. For programs, we discard space for relocs for 2918 symbols not referenced by any dynamic object. */ 2919 if (info->shared) 2920 elf_cris_link_hash_traverse (elf_cris_hash_table (info), 2921 elf_cris_discard_excess_dso_dynamics, 2922 (PTR) info); 2923 else 2924 elf_cris_link_hash_traverse (elf_cris_hash_table (info), 2925 elf_cris_discard_excess_program_dynamics, 2926 (PTR) info); 2927 2928 /* The check_relocs and adjust_dynamic_symbol entry points have 2929 determined the sizes of the various dynamic sections. Allocate 2930 memory for them. */ 2931 plt = FALSE; 2932 relocs = FALSE; 2933 for (s = dynobj->sections; s != NULL; s = s->next) 2934 { 2935 const char *name; 2936 2937 if ((s->flags & SEC_LINKER_CREATED) == 0) 2938 continue; 2939 2940 /* It's OK to base decisions on the section name, because none 2941 of the dynobj section names depend upon the input files. */ 2942 name = bfd_get_section_name (dynobj, s); 2943 2944 if (strcmp (name, ".plt") == 0) 2945 { 2946 /* Remember whether there is a PLT. */ 2947 plt = s->size != 0; 2948 } 2949 else if (CONST_STRNEQ (name, ".rela")) 2950 { 2951 if (s->size != 0) 2952 { 2953 /* Remember whether there are any reloc sections other 2954 than .rela.plt. */ 2955 if (strcmp (name, ".rela.plt") != 0) 2956 relocs = TRUE; 2957 2958 /* We use the reloc_count field as a counter if we need 2959 to copy relocs into the output file. */ 2960 s->reloc_count = 0; 2961 } 2962 } 2963 else if (! CONST_STRNEQ (name, ".got") 2964 && strcmp (name, ".dynbss") != 0) 2965 { 2966 /* It's not one of our sections, so don't allocate space. */ 2967 continue; 2968 } 2969 2970 if (s->size == 0) 2971 { 2972 /* If we don't need this section, strip it from the 2973 output file. This is mostly to handle .rela.bss and 2974 .rela.plt. We must create both sections in 2975 create_dynamic_sections, because they must be created 2976 before the linker maps input sections to output 2977 sections. The linker does that before 2978 adjust_dynamic_symbol is called, and it is that 2979 function which decides whether anything needs to go 2980 into these sections. */ 2981 s->flags |= SEC_EXCLUDE; 2982 continue; 2983 } 2984 2985 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2986 continue; 2987 2988 /* Allocate memory for the section contents. We use bfd_zalloc here 2989 in case unused entries are not reclaimed before the section's 2990 contents are written out. This should not happen, but this way 2991 if it does, we will not write out garbage. For reloc sections, 2992 this will make entries have the type R_CRIS_NONE. */ 2993 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2994 if (s->contents == NULL) 2995 return FALSE; 2996 } 2997 2998 if (elf_hash_table (info)->dynamic_sections_created) 2999 { 3000 /* Add some entries to the .dynamic section. We fill in the 3001 values later, in elf_cris_finish_dynamic_sections, but we 3002 must add the entries now so that we get the correct size for 3003 the .dynamic section. The DT_DEBUG entry is filled in by the 3004 dynamic linker and used by the debugger. */ 3005#define add_dynamic_entry(TAG, VAL) \ 3006 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 3007 3008 if (!info->shared) 3009 { 3010 if (!add_dynamic_entry (DT_DEBUG, 0)) 3011 return FALSE; 3012 } 3013 3014 if (plt) 3015 { 3016 if (!add_dynamic_entry (DT_PLTGOT, 0) 3017 || !add_dynamic_entry (DT_PLTRELSZ, 0) 3018 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 3019 || !add_dynamic_entry (DT_JMPREL, 0)) 3020 return FALSE; 3021 } 3022 3023 if (relocs) 3024 { 3025 if (!add_dynamic_entry (DT_RELA, 0) 3026 || !add_dynamic_entry (DT_RELASZ, 0) 3027 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 3028 return FALSE; 3029 } 3030 3031 if ((info->flags & DF_TEXTREL) != 0) 3032 { 3033 if (!add_dynamic_entry (DT_TEXTREL, 0)) 3034 return FALSE; 3035 info->flags |= DF_TEXTREL; 3036 } 3037 } 3038#undef add_dynamic_entry 3039 3040 return TRUE; 3041} 3042 3043/* This function is called via elf_cris_link_hash_traverse if we are 3044 creating a shared object. In the -Bsymbolic case, it discards the 3045 space allocated to copy PC relative relocs against symbols which 3046 are defined in regular objects. For the normal non-symbolic case, 3047 we also discard space for relocs that have become local due to 3048 symbol visibility changes. We allocated space for them in the 3049 check_relocs routine, but we won't fill them in in the 3050 relocate_section routine. */ 3051 3052static bfd_boolean 3053elf_cris_discard_excess_dso_dynamics (h, inf) 3054 struct elf_cris_link_hash_entry *h; 3055 PTR inf; 3056{ 3057 struct elf_cris_pcrel_relocs_copied *s; 3058 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3059 3060 if (h->root.root.type == bfd_link_hash_warning) 3061 h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link; 3062 3063 /* If a symbol has been forced local or we have found a regular 3064 definition for the symbolic link case, then we won't be needing 3065 any relocs. */ 3066 if (h->root.def_regular 3067 && (h->root.forced_local 3068 || info->symbolic)) 3069 { 3070 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) 3071 s->section->size -= s->count * sizeof (Elf32_External_Rela); 3072 } 3073 3074 return TRUE; 3075} 3076 3077/* This function is called via elf_cris_link_hash_traverse if we are *not* 3078 creating a shared object. We discard space for relocs for symbols put 3079 in the .got, but which we found we do not have to resolve at run-time. */ 3080 3081static bfd_boolean 3082elf_cris_discard_excess_program_dynamics (h, inf) 3083 struct elf_cris_link_hash_entry *h; 3084 PTR inf; 3085{ 3086 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3087 3088 if (h->root.root.type == bfd_link_hash_warning) 3089 h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link; 3090 3091 /* If we're not creating a shared library and have a symbol which is 3092 referred to by .got references, but the symbol is defined locally, 3093 (or rather, not defined by a DSO) then lose the reloc for the .got 3094 (don't allocate room for it). Likewise for relocs for something 3095 for which we create a PLT. */ 3096 if (!h->root.def_dynamic 3097 || h->root.plt.refcount > 0) 3098 { 3099 if (h->root.got.refcount > 0 3100 /* The size of this section is only valid and in sync with the 3101 various reference counts if we do dynamic; don't decrement it 3102 otherwise. */ 3103 && elf_hash_table (info)->dynamic_sections_created) 3104 { 3105 bfd *dynobj = elf_hash_table (info)->dynobj; 3106 asection *srelgot; 3107 3108 BFD_ASSERT (dynobj != NULL); 3109 3110 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 3111 3112 BFD_ASSERT (srelgot != NULL); 3113 3114 srelgot->size -= sizeof (Elf32_External_Rela); 3115 } 3116 3117 /* If the locally-defined symbol isn't used by a DSO, then we don't 3118 have to export it as a dynamic symbol. This was already done for 3119 functions; doing this for all symbols would presumably not 3120 introduce new problems. Of course we don't do this if we're 3121 exporting all dynamic symbols. */ 3122 if (! info->export_dynamic 3123 && h->root.dynindx != -1 3124 && !h->root.def_dynamic 3125 && !h->root.ref_dynamic) 3126 { 3127 h->root.dynindx = -1; 3128 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, 3129 h->root.dynstr_index); 3130 } 3131 } 3132 3133 return TRUE; 3134} 3135 3136/* Reject a file depending on presence and expectation of prefixed 3137 underscores on symbols. */ 3138 3139static bfd_boolean 3140cris_elf_object_p (abfd) 3141 bfd *abfd; 3142{ 3143 if (! cris_elf_set_mach_from_flags (abfd, elf_elfheader (abfd)->e_flags)) 3144 return FALSE; 3145 3146 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)) 3147 return (bfd_get_symbol_leading_char (abfd) == '_'); 3148 else 3149 return (bfd_get_symbol_leading_char (abfd) == 0); 3150} 3151 3152/* Mark presence or absence of leading underscore. Set machine type 3153 flags from mach type. */ 3154 3155static void 3156cris_elf_final_write_processing (abfd, linker) 3157 bfd *abfd; 3158 bfd_boolean linker ATTRIBUTE_UNUSED; 3159{ 3160 unsigned long e_flags = elf_elfheader (abfd)->e_flags; 3161 3162 e_flags &= ~EF_CRIS_UNDERSCORE; 3163 if (bfd_get_symbol_leading_char (abfd) == '_') 3164 e_flags |= EF_CRIS_UNDERSCORE; 3165 3166 switch (bfd_get_mach (abfd)) 3167 { 3168 case bfd_mach_cris_v0_v10: 3169 e_flags |= EF_CRIS_VARIANT_ANY_V0_V10; 3170 break; 3171 3172 case bfd_mach_cris_v10_v32: 3173 e_flags |= EF_CRIS_VARIANT_COMMON_V10_V32; 3174 break; 3175 3176 case bfd_mach_cris_v32: 3177 e_flags |= EF_CRIS_VARIANT_V32; 3178 break; 3179 3180 default: 3181 _bfd_abort (__FILE__, __LINE__, 3182 _("Unexpected machine number")); 3183 } 3184 3185 elf_elfheader (abfd)->e_flags = e_flags; 3186} 3187 3188/* Set the mach type from e_flags value. */ 3189 3190static bfd_boolean 3191cris_elf_set_mach_from_flags (abfd, flags) 3192 bfd *abfd; 3193 unsigned long flags; 3194{ 3195 switch (flags & EF_CRIS_VARIANT_MASK) 3196 { 3197 case EF_CRIS_VARIANT_ANY_V0_V10: 3198 bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v0_v10); 3199 break; 3200 3201 case EF_CRIS_VARIANT_V32: 3202 bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v32); 3203 break; 3204 3205 case EF_CRIS_VARIANT_COMMON_V10_V32: 3206 bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v10_v32); 3207 break; 3208 3209 default: 3210 /* Since we don't recognize them, we obviously can't support them 3211 with this code; we'd have to require that all future handling 3212 would be optional. */ 3213 bfd_set_error (bfd_error_wrong_format); 3214 return FALSE; 3215 } 3216 3217 return TRUE; 3218} 3219 3220/* Display the flags field. */ 3221 3222static bfd_boolean 3223cris_elf_print_private_bfd_data (abfd, ptr) 3224 bfd *abfd; 3225 PTR ptr; 3226{ 3227 FILE *file = (FILE *) ptr; 3228 3229 BFD_ASSERT (abfd != NULL && ptr != NULL); 3230 3231 _bfd_elf_print_private_bfd_data (abfd, ptr); 3232 3233 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 3234 3235 if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE) 3236 fprintf (file, _(" [symbols have a _ prefix]")); 3237 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_VARIANT_MASK) 3238 == EF_CRIS_VARIANT_COMMON_V10_V32) 3239 fprintf (file, _(" [v10 and v32]")); 3240 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_VARIANT_MASK) 3241 == EF_CRIS_VARIANT_V32) 3242 fprintf (file, _(" [v32]")); 3243 3244 fputc ('\n', file); 3245 return TRUE; 3246} 3247 3248/* Don't mix files with and without a leading underscore. */ 3249 3250static bfd_boolean 3251cris_elf_merge_private_bfd_data (ibfd, obfd) 3252 bfd *ibfd; 3253 bfd *obfd; 3254{ 3255 int imach, omach; 3256 3257 if (! _bfd_generic_verify_endian_match (ibfd, obfd)) 3258 return FALSE; 3259 3260 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 3261 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 3262 return TRUE; 3263 3264 imach = bfd_get_mach (ibfd); 3265 3266 if (! elf_flags_init (obfd)) 3267 { 3268 /* This happens when ld starts out with a 'blank' output file. */ 3269 elf_flags_init (obfd) = TRUE; 3270 3271 /* We ignore the linker-set mach, and instead set it according to 3272 the first input file. This would also happen if we could 3273 somehow filter out the OUTPUT_ARCH () setting from elf.sc. 3274 This allows us to keep the same linker config across 3275 cris(v0..v10) and crisv32. The drawback is that we can't force 3276 the output type, which might be a sane thing to do for a 3277 v10+v32 compatibility object. */ 3278 if (! bfd_set_arch_mach (obfd, bfd_arch_cris, imach)) 3279 return FALSE; 3280 } 3281 3282 if (bfd_get_symbol_leading_char (ibfd) 3283 != bfd_get_symbol_leading_char (obfd)) 3284 { 3285 (*_bfd_error_handler) 3286 (bfd_get_symbol_leading_char (ibfd) == '_' 3287 ? _("%B: uses _-prefixed symbols, but writing file with non-prefixed symbols") 3288 : _("%B: uses non-prefixed symbols, but writing file with _-prefixed symbols"), 3289 ibfd); 3290 bfd_set_error (bfd_error_bad_value); 3291 return FALSE; 3292 } 3293 3294 omach = bfd_get_mach (obfd); 3295 3296 if (imach != omach) 3297 { 3298 /* We can get an incompatible combination only if either is 3299 bfd_mach_cris_v32, and the other one isn't compatible. */ 3300 if ((imach == bfd_mach_cris_v32 3301 && omach != bfd_mach_cris_v10_v32) 3302 || (omach == bfd_mach_cris_v32 3303 && imach != bfd_mach_cris_v10_v32)) 3304 { 3305 (*_bfd_error_handler) 3306 ((imach == bfd_mach_cris_v32) 3307 ? _("%B contains CRIS v32 code, incompatible" 3308 " with previous objects") 3309 : _("%B contains non-CRIS-v32 code, incompatible" 3310 " with previous objects"), 3311 ibfd); 3312 bfd_set_error (bfd_error_bad_value); 3313 return FALSE; 3314 } 3315 3316 /* We don't have to check the case where the input is compatible 3317 with v10 and v32, because the output is already known to be set 3318 to the other (compatible) mach. */ 3319 if (omach == bfd_mach_cris_v10_v32 3320 && ! bfd_set_arch_mach (obfd, bfd_arch_cris, imach)) 3321 return FALSE; 3322 } 3323 3324 return TRUE; 3325} 3326 3327/* Do side-effects of e_flags copying to obfd. */ 3328 3329static bfd_boolean 3330cris_elf_copy_private_bfd_data (ibfd, obfd) 3331 bfd *ibfd; 3332 bfd *obfd; 3333{ 3334 /* Call the base function. */ 3335 if (!_bfd_elf_copy_private_bfd_data (ibfd, obfd)) 3336 return FALSE; 3337 3338 /* If output is big-endian for some obscure reason, stop here. */ 3339 if (_bfd_generic_verify_endian_match (ibfd, obfd) == FALSE) 3340 return FALSE; 3341 3342 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 3343 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 3344 return TRUE; 3345 3346 /* Do what we really came here for. */ 3347 return bfd_set_arch_mach (obfd, bfd_arch_cris, bfd_get_mach (ibfd)); 3348} 3349 3350static enum elf_reloc_type_class 3351elf_cris_reloc_type_class (rela) 3352 const Elf_Internal_Rela *rela; 3353{ 3354 switch ((int) ELF32_R_TYPE (rela->r_info)) 3355 { 3356 case R_CRIS_RELATIVE: 3357 return reloc_class_relative; 3358 case R_CRIS_JUMP_SLOT: 3359 return reloc_class_plt; 3360 case R_CRIS_COPY: 3361 return reloc_class_copy; 3362 default: 3363 return reloc_class_normal; 3364 } 3365} 3366 3367#define ELF_ARCH bfd_arch_cris 3368#define ELF_MACHINE_CODE EM_CRIS 3369#define ELF_MAXPAGESIZE 0x2000 3370 3371#define TARGET_LITTLE_SYM bfd_elf32_cris_vec 3372#define TARGET_LITTLE_NAME "elf32-cris" 3373#define elf_symbol_leading_char 0 3374 3375#define elf_info_to_howto_rel NULL 3376#define elf_info_to_howto cris_info_to_howto_rela 3377#define elf_backend_relocate_section cris_elf_relocate_section 3378#define elf_backend_gc_mark_hook cris_elf_gc_mark_hook 3379#define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook 3380#define elf_backend_check_relocs cris_elf_check_relocs 3381#define elf_backend_grok_prstatus cris_elf_grok_prstatus 3382#define elf_backend_grok_psinfo cris_elf_grok_psinfo 3383 3384#define elf_backend_can_gc_sections 1 3385#define elf_backend_can_refcount 1 3386 3387#define elf_backend_object_p cris_elf_object_p 3388#define elf_backend_final_write_processing \ 3389 cris_elf_final_write_processing 3390#define bfd_elf32_bfd_print_private_bfd_data \ 3391 cris_elf_print_private_bfd_data 3392#define bfd_elf32_bfd_merge_private_bfd_data \ 3393 cris_elf_merge_private_bfd_data 3394#define bfd_elf32_bfd_copy_private_bfd_data \ 3395 cris_elf_copy_private_bfd_data 3396 3397#define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup 3398 3399#define bfd_elf32_bfd_link_hash_table_create \ 3400 elf_cris_link_hash_table_create 3401#define elf_backend_adjust_dynamic_symbol \ 3402 elf_cris_adjust_dynamic_symbol 3403#define elf_backend_size_dynamic_sections \ 3404 elf_cris_size_dynamic_sections 3405#define elf_backend_init_index_section _bfd_elf_init_1_index_section 3406#define elf_backend_finish_dynamic_symbol \ 3407 elf_cris_finish_dynamic_symbol 3408#define elf_backend_finish_dynamic_sections \ 3409 elf_cris_finish_dynamic_sections 3410#define elf_backend_create_dynamic_sections \ 3411 _bfd_elf_create_dynamic_sections 3412#define bfd_elf32_bfd_final_link \ 3413 bfd_elf_gc_common_final_link 3414#define elf_backend_hide_symbol elf_cris_hide_symbol 3415#define elf_backend_reloc_type_class elf_cris_reloc_type_class 3416 3417#define elf_backend_want_got_plt 1 3418#define elf_backend_plt_readonly 1 3419#define elf_backend_want_plt_sym 0 3420#define elf_backend_got_header_size 12 3421 3422/* Later, we my want to optimize RELA entries into REL entries for dynamic 3423 linking and libraries (if it's a win of any significance). Until then, 3424 take the easy route. */ 3425#define elf_backend_may_use_rel_p 0 3426#define elf_backend_may_use_rela_p 1 3427#define elf_backend_rela_normal 1 3428 3429#include "elf32-target.h" 3430 3431#undef TARGET_LITTLE_SYM 3432#undef TARGET_LITTLE_NAME 3433#undef elf_symbol_leading_char 3434 3435#define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec 3436#define TARGET_LITTLE_NAME "elf32-us-cris" 3437#define elf_symbol_leading_char '_' 3438#undef elf32_bed 3439#define elf32_bed elf32_us_cris_bed 3440 3441#include "elf32-target.h" 3442