1/* Internal interfaces for libelf. 2 Copyright (C) 1998-2010 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 Contributed by Ulrich Drepper <drepper@redhat.com>, 1998. 5 6 Red Hat elfutils is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by the 8 Free Software Foundation; version 2 of the License. 9 10 Red Hat elfutils is distributed in the hope that it will be useful, but 11 WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 General Public License for more details. 14 15 You should have received a copy of the GNU General Public License along 16 with Red Hat elfutils; if not, write to the Free Software Foundation, 17 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 18 19 In addition, as a special exception, Red Hat, Inc. gives You the 20 additional right to link the code of Red Hat elfutils with code licensed 21 under any Open Source Initiative certified open source license 22 (http://www.opensource.org/licenses/index.php) which requires the 23 distribution of source code with any binary distribution and to 24 distribute linked combinations of the two. Non-GPL Code permitted under 25 this exception must only link to the code of Red Hat elfutils through 26 those well defined interfaces identified in the file named EXCEPTION 27 found in the source code files (the "Approved Interfaces"). The files 28 of Non-GPL Code may instantiate templates or use macros or inline 29 functions from the Approved Interfaces without causing the resulting 30 work to be covered by the GNU General Public License. Only Red Hat, 31 Inc. may make changes or additions to the list of Approved Interfaces. 32 Red Hat's grant of this exception is conditioned upon your not adding 33 any new exceptions. If you wish to add a new Approved Interface or 34 exception, please contact Red Hat. You must obey the GNU General Public 35 License in all respects for all of the Red Hat elfutils code and other 36 code used in conjunction with Red Hat elfutils except the Non-GPL Code 37 covered by this exception. If you modify this file, you may extend this 38 exception to your version of the file, but you are not obligated to do 39 so. If you do not wish to provide this exception without modification, 40 you must delete this exception statement from your version and license 41 this file solely under the GPL without exception. 42 43 Red Hat elfutils is an included package of the Open Invention Network. 44 An included package of the Open Invention Network is a package for which 45 Open Invention Network licensees cross-license their patents. No patent 46 license is granted, either expressly or impliedly, by designation as an 47 included package. Should you wish to participate in the Open Invention 48 Network licensing program, please visit www.openinventionnetwork.com 49 <http://www.openinventionnetwork.com>. */ 50 51#ifndef _LIBELFP_H 52#define _LIBELFP_H 1 53 54#ifdef HAVE_CONFIG_H 55# include <config.h> 56#endif 57 58#include <ar.h> 59#include <gelf.h> 60 61#include <errno.h> 62#include <stdint.h> 63#include <stdio.h> 64#include <string.h> 65 66/* gettext helper macros. */ 67#define _(Str) dgettext ("elfutils", Str) 68 69 70/* Helper Macros to write 32 bit and 64 bit functions. */ 71#define __elfw2_(Bits, Name) __elf##Bits##_##Name 72#define elfw2_(Bits, Name) elf##Bits##_##Name 73#define ElfW2_(Bits, Name) Elf##Bits##_##Name 74#define ELFW2_(Bits, Name) ELF##Bits##_##Name 75#define ELFW_(Name, Bits) Name##Bits 76#define __elfw2(Bits, Name) __elfw2_(Bits, Name) 77#define elfw2(Bits, Name) elfw2_(Bits, Name) 78#define ElfW2(Bits, Name) ElfW2_(Bits, Name) 79#define ELFW2(Bits, Name) ELFW2_(Bits, Name) 80#define ELFW(Name, Bits) ELFW_(Name, Bits) 81 82 83/* Sizes of the external types, for 32 bits objects. */ 84#define ELF32_FSZ_ADDR 4 85#define ELF32_FSZ_OFF 4 86#define ELF32_FSZ_HALF 2 87#define ELF32_FSZ_WORD 4 88#define ELF32_FSZ_SWORD 4 89#define ELF32_FSZ_XWORD 8 90#define ELF32_FSZ_SXWORD 8 91 92/* Same for 64 bits objects. */ 93#define ELF64_FSZ_ADDR 8 94#define ELF64_FSZ_OFF 8 95#define ELF64_FSZ_HALF 2 96#define ELF64_FSZ_WORD 4 97#define ELF64_FSZ_SWORD 4 98#define ELF64_FSZ_XWORD 8 99#define ELF64_FSZ_SXWORD 8 100 101 102/* This is an extension of the ELF_F_* enumeration. The values here are 103 not part of the library interface, they are only used internally. */ 104enum 105{ 106 ELF_F_MMAPPED = 0x40, 107 ELF_F_MALLOCED = 0x80, 108 ELF_F_FILEDATA = 0x100 109}; 110 111 112/* Get definition of all the external types. */ 113#include "exttypes.h" 114 115 116/* Error values. */ 117enum 118{ 119 ELF_E_NOERROR = 0, 120 ELF_E_UNKNOWN_ERROR, 121 ELF_E_UNKNOWN_VERSION, 122 ELF_E_UNKNOWN_TYPE, 123 ELF_E_INVALID_HANDLE, 124 ELF_E_SOURCE_SIZE, 125 ELF_E_DEST_SIZE, 126 ELF_E_INVALID_ENCODING, 127 ELF_E_NOMEM, 128 ELF_E_INVALID_FILE, 129 ELF_E_INVALID_OP, 130 ELF_E_NO_VERSION, 131 ELF_E_INVALID_CMD, 132 ELF_E_RANGE, 133 ELF_E_ARCHIVE_FMAG, 134 ELF_E_INVALID_ARCHIVE, 135 ELF_E_NO_ARCHIVE, 136 ELF_E_NO_INDEX, 137 ELF_E_READ_ERROR, 138 ELF_E_WRITE_ERROR, 139 ELF_E_INVALID_CLASS, 140 ELF_E_INVALID_INDEX, 141 ELF_E_INVALID_OPERAND, 142 ELF_E_INVALID_SECTION, 143 ELF_E_INVALID_COMMAND, 144 ELF_E_WRONG_ORDER_EHDR, 145 ELF_E_FD_DISABLED, 146 ELF_E_FD_MISMATCH, 147 ELF_E_OFFSET_RANGE, 148 ELF_E_NOT_NUL_SECTION, 149 ELF_E_DATA_MISMATCH, 150 ELF_E_INVALID_SECTION_HEADER, 151 ELF_E_INVALID_DATA, 152 ELF_E_DATA_ENCODING, 153 ELF_E_SECTION_TOO_SMALL, 154 ELF_E_INVALID_ALIGN, 155 ELF_E_INVALID_SHENTSIZE, 156 ELF_E_UPDATE_RO, 157 ELF_E_NOFILE, 158 ELF_E_GROUP_NOT_REL, 159 ELF_E_INVALID_PHDR, 160 ELF_E_NO_PHDR, 161 ELF_E_INVALID_OFFSET, 162 /* Keep this as the last entry. */ 163 ELF_E_NUM 164}; 165 166 167/* The visible `Elf_Data' type is not sufficent for some operations due 168 to a misdesigned interface. Extend it for internal purposes. */ 169typedef struct 170{ 171 Elf_Data d; 172 Elf_Scn *s; 173} Elf_Data_Scn; 174 175 176/* List of `Elf_Data' descriptors. This is what makes up the section 177 contents. */ 178typedef struct Elf_Data_List 179{ 180 /* `data' *must* be the first element in the struct. */ 181 Elf_Data_Scn data; 182 struct Elf_Data_List *next; 183 int flags; 184} Elf_Data_List; 185 186 187/* Descriptor for ELF section. */ 188struct Elf_Scn 189{ 190 /* We have to distinguish several different situations: 191 192 1. the section is user created. Therefore there is no file or memory 193 region to read the data from. Here we have two different subcases: 194 195 a) data was not yet added (before the first `elf_newdata' call) 196 197 b) at least one data set is available 198 199 2. this is a section from a file/memory region. We have to read the 200 current content in one data block if we have to. But we don't 201 read the data until it is necessary. So we have the subcases: 202 203 a) the section in the file has size zero (for whatever reason) 204 205 b) the data of the file is not (yet) read 206 207 c) the data is read and available. 208 209 In addition to this we have different data sets, the raw and the converted 210 data. This distinction only exists for the data read from the file. 211 All user-added data set (all but the first when read from the file or 212 all of them for user-create sections) are the same in both formats. 213 We don't create the converted data before it is necessary. 214 215 The `data_read' element signals whether data is available in the 216 raw format. 217 218 If there is data from the file/memory region or if read one data 219 set is added the `rawdata_list_read' pointer in non-NULL and points 220 to the last filled data set. `raw_datalist_rear' is therefore NULL 221 only if there is no data set at all. 222 223 This so far allows to distinguish all but two cases (given that the 224 `rawdata_list' and `data_list' entries are initialized to zero) is 225 between not yet loaded data from the file/memory region and a section 226 with zero size and type ELF_T_BYTE. */ 227 Elf_Data_List data_list; /* List of data buffers. */ 228 Elf_Data_List *data_list_rear; /* Pointer to the rear of the data list. */ 229 230 Elf_Data_Scn rawdata; /* Uninterpreted data of the section. */ 231 232 int data_read; /* Nonzero if the section was created by the 233 user or if the data from the file/memory 234 is read. */ 235 int shndx_index; /* Index of the extended section index 236 table for this symbol table (if this 237 section is a symbol table). */ 238 239 size_t index; /* Index of this section. */ 240 struct Elf *elf; /* The underlying ELF file. */ 241 242 union 243 { 244 Elf32_Shdr *e32; /* Pointer to 32bit section header. */ 245 Elf64_Shdr *e64; /* Pointer to 64bit section header. */ 246 } shdr; 247 248 unsigned int shdr_flags; /* Section header modified? */ 249 unsigned int flags; /* Section changed in size? */ 250 251 char *rawdata_base; /* The unmodified data of the section. */ 252 char *data_base; /* The converted data of the section. */ 253 254 struct Elf_ScnList *list; /* Pointer to the section list element the 255 data is in. */ 256}; 257 258 259/* List of section. */ 260typedef struct Elf_ScnList 261{ 262 unsigned int cnt; /* Number of elements of 'data' used. */ 263 unsigned int max; /* Number of elements of 'data' allocated. */ 264 struct Elf_ScnList *next; /* Next block of sections. */ 265 struct Elf_Scn data[0]; /* Section data. */ 266} Elf_ScnList; 267 268 269/* elf_getdata_rawchunk result. */ 270typedef struct Elf_Data_Chunk 271{ 272 Elf_Data_Scn data; 273 union 274 { 275 Elf_Scn dummy_scn; 276 struct Elf_Data_Chunk *next; 277 }; 278} Elf_Data_Chunk; 279 280 281/* The ELF descriptor. */ 282struct Elf 283{ 284 /* Address to which the file was mapped. NULL if not mapped. */ 285 void *map_address; 286 287 /* When created for an archive member this points to the descriptor 288 for the archive. */ 289 Elf *parent; 290 Elf *next; /* Used in list of archive descriptors. */ 291 292 /* What kind of file is underneath (ELF file, archive...). */ 293 Elf_Kind kind; 294 295 /* Command used to create this descriptor. */ 296 Elf_Cmd cmd; 297 298 /* The binary class. */ 299 unsigned int class; 300 301 /* The used file descriptor. -1 if not available anymore. */ 302 int fildes; 303 304 /* Offset in the archive this file starts or zero. */ 305 off_t start_offset; 306 307 /* Size of the file in the archive or the entire file size, or ~0 308 for an (yet) unknown size. */ 309 size_t maximum_size; 310 311 /* Describes the way the memory was allocated and if the dirty bit is 312 signalled it means that the whole file has to be rewritten since 313 the layout changed. */ 314 int flags; 315 316 /* Reference counting for the descriptor. */ 317 int ref_count; 318 319 /* Lock to handle multithreaded programs. */ 320 rwlock_define (,lock); 321 322 union 323 { 324 struct 325 { 326 /* The next fields are only useful when testing for ==/!= NULL. */ 327 void *ehdr; 328 void *shdr; 329 void *phdr; 330 331 Elf_ScnList *scns_last; /* Last element in the section list. 332 If NULL the data has not yet been 333 read from the file. */ 334 Elf_Data_Chunk *rawchunks; /* List of elf_getdata_rawchunk results. */ 335 unsigned int scnincr; /* Number of sections allocate the last 336 time. */ 337 int ehdr_flags; /* Flags (dirty) for ELF header. */ 338 int phdr_flags; /* Flags (dirty|malloc) for program header. */ 339 int shdr_malloced; /* Nonzero if shdr array was allocated. */ 340 off64_t sizestr_offset; /* Offset of the size string in the parent 341 if this is an archive member. */ 342 } elf; 343 344 struct 345 { 346 Elf32_Ehdr *ehdr; /* Pointer to the ELF header. This is 347 never malloced. */ 348 Elf32_Shdr *shdr; /* Used when reading from a file. */ 349 Elf32_Phdr *phdr; /* Pointer to the program header array. */ 350 Elf_ScnList *scns_last; /* Last element in the section list. 351 If NULL the data has not yet been 352 read from the file. */ 353 Elf_Data_Chunk *rawchunks; /* List of elf_getdata_rawchunk results. */ 354 unsigned int scnincr; /* Number of sections allocate the last 355 time. */ 356 int ehdr_flags; /* Flags (dirty) for ELF header. */ 357 int phdr_flags; /* Flags (dirty|malloc) for program header. */ 358 int shdr_malloced; /* Nonzero if shdr array was allocated. */ 359 off64_t sizestr_offset; /* Offset of the size string in the parent 360 if this is an archive member. */ 361 Elf32_Ehdr ehdr_mem; /* Memory used for ELF header when not 362 mmaped. */ 363 char __e32scnspad[sizeof (Elf64_Ehdr) - sizeof (Elf32_Ehdr)]; 364 365 /* The section array. */ 366 Elf_ScnList scns; 367 } elf32; 368 369 struct 370 { 371 Elf64_Ehdr *ehdr; /* Pointer to the ELF header. This is 372 never malloced. */ 373 Elf64_Shdr *shdr; /* Used when reading from a file. */ 374 Elf64_Phdr *phdr; /* Pointer to the program header array. */ 375 Elf_ScnList *scns_last; /* Last element in the section list. 376 If NULL the data has not yet been 377 read from the file. */ 378 Elf_Data_Chunk *rawchunks; /* List of elf_getdata_rawchunk results. */ 379 unsigned int scnincr; /* Number of sections allocate the last 380 time. */ 381 int ehdr_flags; /* Flags (dirty) for ELF header. */ 382 int phdr_flags; /* Flags (dirty|malloc) for program header. */ 383 int shdr_malloced; /* Nonzero if shdr array was allocated. */ 384 off64_t sizestr_offset; /* Offset of the size string in the parent 385 if this is an archive member. */ 386 Elf64_Ehdr ehdr_mem; /* Memory used for ELF header when not 387 mmaped. */ 388 389 /* The section array. */ 390 Elf_ScnList scns; 391 } elf64; 392 393 struct 394 { 395 Elf *children; /* List of all descriptors for this archive. */ 396 Elf_Arsym *ar_sym; /* Symbol table returned by elf_getarsym. */ 397 size_t ar_sym_num; /* Number of entries in `ar_sym'. */ 398 char *long_names; /* If no index is available but long names 399 are used this elements points to the data.*/ 400 size_t long_names_len; /* Length of the long name table. */ 401 off_t offset; /* Offset in file we are currently at. 402 elf_next() advances this to the next 403 member of the archive. */ 404 Elf_Arhdr elf_ar_hdr; /* Structure returned by 'elf_getarhdr'. */ 405 struct ar_hdr ar_hdr; /* Header read from file. */ 406 char ar_name[16]; /* NUL terminated ar_name of elf_ar_hdr. */ 407 char raw_name[17]; /* This is a buffer for the NUL terminated 408 named raw_name used in the elf_ar_hdr. */ 409 } ar; 410 } state; 411 412 /* There absolutely never must be anything following the union. */ 413}; 414 415/* Type of the conversion functions. These functions will convert the 416 byte order. */ 417typedef void (*xfct_t) (void *, const void *, size_t, int); 418 419/* The table with the function pointers. */ 420extern const xfct_t __elf_xfctstom[EV_NUM - 1][EV_NUM - 1][ELFCLASSNUM - 1][ELF_T_NUM] attribute_hidden; 421extern const xfct_t __elf_xfctstof[EV_NUM - 1][EV_NUM - 1][ELFCLASSNUM - 1][ELF_T_NUM] attribute_hidden; 422 423 424/* Array with sizes of the external types indexed by ELF version, binary 425 class, and type. */ 426extern const size_t __libelf_type_sizes[EV_NUM - 1][ELFCLASSNUM - 1][ELF_T_NUM] attribute_hidden; 427/* We often have to access the size for a type in the current version. */ 428#if EV_NUM != 2 429# define elf_typesize(class,type,n) \ 430 elfw2(class,fsize) (type, n, __libelf_version) 431#else 432# define elf_typesize(class,type,n) \ 433 (__libelf_type_sizes[EV_CURRENT - 1][ELFW(ELFCLASS,class) - 1][type] * n) 434#endif 435 436/* Currently selected version of the ELF specification. */ 437extern unsigned int __libelf_version attribute_hidden; 438 439/* The byte value used for filling gaps. */ 440extern int __libelf_fill_byte attribute_hidden; 441 442/* Nonzero if the version was set. */ 443extern int __libelf_version_initialized attribute_hidden; 444 445/* Index for __libelf_type_sizes et al. */ 446#if EV_NUM == 2 447# define LIBELF_EV_IDX 0 448#else 449# define LIBELF_EV_IDX (__libelf_version - 1) 450#endif 451 452#if !ALLOW_UNALIGNED 453/* Array with alignment requirements of the internal types indexed by ELF 454 version, binary class, and type. */ 455extern const uint_fast8_t __libelf_type_aligns[EV_NUM - 1][ELFCLASSNUM - 1][ELF_T_NUM] attribute_hidden; 456# define __libelf_type_align(class, type) \ 457 (__libelf_type_aligns[LIBELF_EV_IDX][class - 1][type] ?: 1) 458#else 459# define __libelf_type_align(class, type) 1 460#endif 461 462/* The libelf API does not have such a function but it is still useful. 463 Get the memory size for the given type. 464 465 These functions cannot be marked internal since they are aliases 466 of the export elfXX_fsize functions.*/ 467extern size_t __elf32_msize (Elf_Type __type, size_t __count, 468 unsigned int __version); 469extern size_t __elf64_msize (Elf_Type __type, size_t __count, 470 unsigned int __version); 471 472 473/* Create Elf descriptor from memory image. */ 474extern Elf *__libelf_read_mmaped_file (int fildes, void *map_address, 475 off_t offset, size_t maxsize, 476 Elf_Cmd cmd, Elf *parent) 477 internal_function; 478 479/* Set error value. */ 480extern void __libelf_seterrno (int value) internal_function; 481 482/* Get the next archive header. */ 483extern int __libelf_next_arhdr_wrlock (Elf *elf) internal_function; 484 485/* Read all of the file associated with the descriptor. */ 486extern char *__libelf_readall (Elf *elf) internal_function; 487 488/* Read the complete section table and convert the byte order if necessary. */ 489extern int __libelf_readsections (Elf *elf) internal_function; 490 491/* Store the information for the raw data in the `rawdata_list' element. */ 492extern int __libelf_set_rawdata (Elf_Scn *scn) internal_function; 493extern int __libelf_set_rawdata_wrlock (Elf_Scn *scn) internal_function; 494 495 496/* Helper functions for elf_update. */ 497extern off_t __elf32_updatenull_wrlock (Elf *elf, int *change_bop, 498 size_t shnum) internal_function; 499extern off_t __elf64_updatenull_wrlock (Elf *elf, int *change_bop, 500 size_t shnum) internal_function; 501 502extern int __elf32_updatemmap (Elf *elf, int change_bo, size_t shnum) 503 internal_function; 504extern int __elf64_updatemmap (Elf *elf, int change_bo, size_t shnum) 505 internal_function; 506extern int __elf32_updatefile (Elf *elf, int change_bo, size_t shnum) 507 internal_function; 508extern int __elf64_updatefile (Elf *elf, int change_bo, size_t shnum) 509 internal_function; 510 511 512/* Alias for exported functions to avoid PLT entries, and 513 rdlock/wrlock variants of these functions. */ 514extern int __elf_end_internal (Elf *__elf) attribute_hidden; 515extern Elf *__elf_begin_internal (int __fildes, Elf_Cmd __cmd, Elf *__ref) 516 attribute_hidden; 517extern Elf32_Ehdr *__elf32_getehdr_wrlock (Elf *__elf) internal_function; 518extern Elf64_Ehdr *__elf64_getehdr_wrlock (Elf *__elf) internal_function; 519extern Elf32_Ehdr *__elf32_newehdr_internal (Elf *__elf) attribute_hidden; 520extern Elf64_Ehdr *__elf64_newehdr_internal (Elf *__elf) attribute_hidden; 521extern Elf32_Phdr *__elf32_getphdr_internal (Elf *__elf) attribute_hidden; 522extern Elf64_Phdr *__elf64_getphdr_internal (Elf *__elf) attribute_hidden; 523extern Elf32_Phdr *__elf32_getphdr_wrlock (Elf *__elf) attribute_hidden; 524extern Elf64_Phdr *__elf64_getphdr_wrlock (Elf *__elf) attribute_hidden; 525extern Elf32_Phdr *__elf32_newphdr_internal (Elf *__elf, size_t __cnt) 526 attribute_hidden; 527extern Elf64_Phdr *__elf64_newphdr_internal (Elf *__elf, size_t __cnt) 528 attribute_hidden; 529extern Elf_Scn *__elf32_offscn_internal (Elf *__elf, Elf32_Off __offset) 530 attribute_hidden; 531extern Elf_Scn *__elf64_offscn_internal (Elf *__elf, Elf64_Off __offset) 532 attribute_hidden; 533extern int __elf_getphdrnum_rdlock (Elf *__elf, size_t *__dst) 534 internal_function; 535extern int __elf_getshdrnum_rdlock (Elf *__elf, size_t *__dst) 536 internal_function; 537extern int __elf_getshdrstrndx_internal (Elf *__elf, size_t *__dst) 538 attribute_hidden; 539extern Elf32_Shdr *__elf32_getshdr_rdlock (Elf_Scn *__scn) internal_function; 540extern Elf64_Shdr *__elf64_getshdr_rdlock (Elf_Scn *__scn) internal_function; 541extern Elf32_Shdr *__elf32_getshdr_wrlock (Elf_Scn *__scn) internal_function; 542extern Elf64_Shdr *__elf64_getshdr_wrlock (Elf_Scn *__scn) internal_function; 543extern Elf_Scn *__elf_getscn_internal (Elf *__elf, size_t __index) 544 attribute_hidden; 545extern Elf_Scn *__elf_nextscn_internal (Elf *__elf, Elf_Scn *__scn) 546 attribute_hidden; 547extern int __elf_scnshndx_internal (Elf_Scn *__scn) attribute_hidden; 548extern Elf_Data *__elf_getdata_internal (Elf_Scn *__scn, Elf_Data *__data) 549 attribute_hidden; 550extern Elf_Data *__elf_getdata_rdlock (Elf_Scn *__scn, Elf_Data *__data) 551 internal_function; 552extern Elf_Data *__elf_rawdata_internal (Elf_Scn *__scn, Elf_Data *__data) 553 attribute_hidden; 554extern char *__elf_strptr_internal (Elf *__elf, size_t __index, 555 size_t __offset) attribute_hidden; 556extern Elf_Data *__elf32_xlatetom_internal (Elf_Data *__dest, 557 const Elf_Data *__src, 558 unsigned int __encode) 559 attribute_hidden; 560extern Elf_Data *__elf64_xlatetom_internal (Elf_Data *__dest, 561 const Elf_Data *__src, 562 unsigned int __encode) 563 attribute_hidden; 564extern Elf_Data *__elf32_xlatetof_internal (Elf_Data *__dest, 565 const Elf_Data *__src, 566 unsigned int __encode) 567 attribute_hidden; 568extern Elf_Data *__elf64_xlatetof_internal (Elf_Data *__dest, 569 const Elf_Data *__src, 570 unsigned int __encode) 571 attribute_hidden; 572extern unsigned int __elf_version_internal (unsigned int __version) 573 attribute_hidden; 574extern unsigned long int __elf_hash_internal (const char *__string) 575 __attribute__ ((__pure__, visibility ("hidden"))); 576extern long int __elf32_checksum_internal (Elf *__elf) attribute_hidden; 577extern long int __elf64_checksum_internal (Elf *__elf) attribute_hidden; 578 579 580extern GElf_Ehdr *__gelf_getehdr_rdlock (Elf *__elf, GElf_Ehdr *__dest) 581 internal_function; 582extern size_t __gelf_fsize_internal (Elf *__elf, Elf_Type __type, 583 size_t __count, unsigned int __version) 584 attribute_hidden; 585extern GElf_Shdr *__gelf_getshdr_internal (Elf_Scn *__scn, GElf_Shdr *__dst) 586 attribute_hidden; 587extern GElf_Sym *__gelf_getsym_internal (Elf_Data *__data, int __ndx, 588 GElf_Sym *__dst) attribute_hidden; 589 590 591extern uint32_t __libelf_crc32 (uint32_t crc, unsigned char *buf, size_t len) 592 attribute_hidden; 593 594 595/* We often have to update a flag iff a value changed. Make this 596 convenient. */ 597#define update_if_changed(var, exp, flag) \ 598 do { \ 599 __typeof__ (var) *_var = &(var); \ 600 __typeof__ (exp) _exp = (exp); \ 601 if (*_var != _exp) \ 602 { \ 603 *_var = _exp; \ 604 (flag) |= ELF_F_DIRTY; \ 605 } \ 606 } while (0) 607 608/* Align offset to 4 bytes as needed for note name and descriptor data. */ 609#define NOTE_ALIGN(n) (((n) + 3) & -4U) 610 611#endif /* libelfP.h */ 612