1 /* Interface for libelf.
2 Copyright (C) 1998-2010 Red Hat, Inc.
3 This file is part of elfutils.
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of either
8 * the GNU Lesser General Public License as published by the Free
9 Software Foundation; either version 3 of the License, or (at
10 your option) any later version
14 * the GNU General Public License as published by the Free
15 Software Foundation; either version 2 of the License, or (at
16 your option) any later version
18 or both in parallel, as here.
20 elfutils is distributed in the hope that it will be useful, but
21 WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 General Public License for more details.
25 You should have received copies of the GNU General Public License and
26 the GNU Lesser General Public License along with this program. If
27 not, see <http://www.gnu.org/licenses/>. */
32 #include <sys/types.h>
34 /* Get the ELF types. */
38 /* Known translation types. */
41 ELF_T_BYTE, /* unsigned char */
42 ELF_T_ADDR, /* Elf32_Addr, Elf64_Addr, ... */
43 ELF_T_DYN, /* Dynamic section record. */
44 ELF_T_EHDR, /* ELF header. */
45 ELF_T_HALF, /* Elf32_Half, Elf64_Half, ... */
46 ELF_T_OFF, /* Elf32_Off, Elf64_Off, ... */
47 ELF_T_PHDR, /* Program header. */
48 ELF_T_RELA, /* Relocation entry with addend. */
49 ELF_T_REL, /* Relocation entry. */
50 ELF_T_SHDR, /* Section header. */
51 ELF_T_SWORD, /* Elf32_Sword, Elf64_Sword, ... */
52 ELF_T_SYM, /* Symbol record. */
53 ELF_T_WORD, /* Elf32_Word, Elf64_Word, ... */
54 ELF_T_XWORD, /* Elf32_Xword, Elf64_Xword, ... */
55 ELF_T_SXWORD, /* Elf32_Sxword, Elf64_Sxword, ... */
56 ELF_T_VDEF, /* Elf32_Verdef, Elf64_Verdef, ... */
57 ELF_T_VDAUX, /* Elf32_Verdaux, Elf64_Verdaux, ... */
58 ELF_T_VNEED, /* Elf32_Verneed, Elf64_Verneed, ... */
59 ELF_T_VNAUX, /* Elf32_Vernaux, Elf64_Vernaux, ... */
60 ELF_T_NHDR, /* Elf32_Nhdr, Elf64_Nhdr, ... */
61 ELF_T_SYMINFO, /* Elf32_Syminfo, Elf64_Syminfo, ... */
62 ELF_T_MOVE, /* Elf32_Move, Elf64_Move, ... */
63 ELF_T_LIB, /* Elf32_Lib, Elf64_Lib, ... */
64 ELF_T_GNUHASH, /* GNU-style hash section. */
65 ELF_T_AUXV, /* Elf32_auxv_t, Elf64_auxv_t, ... */
66 /* Keep this the last entry. */
70 /* Descriptor for data to be converted to or from memory format. */
73 void *d_buf; /* Pointer to the actual data. */
74 Elf_Type d_type; /* Type of this piece of data. */
75 unsigned int d_version; /* ELF version. */
76 size_t d_size; /* Size in bytes. */
77 loff_t d_off; /* Offset into section. */
78 size_t d_align; /* Alignment in section. */
82 /* Commands for `...'. */
85 ELF_C_NULL, /* Nothing, terminate, or compute only. */
86 ELF_C_READ, /* Read .. */
87 ELF_C_RDWR, /* Read and write .. */
88 ELF_C_WRITE, /* Write .. */
89 ELF_C_CLR, /* Clear flag. */
90 ELF_C_SET, /* Set flag. */
91 ELF_C_FDDONE, /* Signal that file descriptor will not be
93 ELF_C_FDREAD, /* Read rest of data so that file descriptor
94 is not used anymore. */
95 /* The following are extensions. */
96 ELF_C_READ_MMAP, /* Read, but mmap the file if possible. */
97 ELF_C_RDWR_MMAP, /* Read and write, with mmap. */
98 ELF_C_WRITE_MMAP, /* Write, with mmap. */
99 ELF_C_READ_MMAP_PRIVATE, /* Read, but memory is writable, results are
100 not written to the file. */
101 ELF_C_EMPTY, /* Copy basic file data but not the content. */
102 /* Keep this the last entry. */
107 /* Flags for the ELF structures. */
111 #define ELF_F_DIRTY ELF_F_DIRTY
113 #define ELF_F_LAYOUT ELF_F_LAYOUT
114 ELF_F_PERMISSIVE = 0x8
115 #define ELF_F_PERMISSIVE ELF_F_PERMISSIVE
119 /* Identification values for recognized object files. */
122 ELF_K_NONE, /* Unknown. */
123 ELF_K_AR, /* Archive. */
124 ELF_K_COFF, /* Stupid old COFF. */
125 ELF_K_ELF, /* ELF file. */
126 /* Keep this the last entry. */
131 /* Archive member header. */
134 char *ar_name; /* Name of archive member. */
135 time_t ar_date; /* File date. */
136 uid_t ar_uid; /* User ID. */
137 gid_t ar_gid; /* Group ID. */
138 mode_t ar_mode; /* File mode. */
139 loff_t ar_size; /* File size. */
140 char *ar_rawname; /* Original name of archive member. */
144 /* Archive symbol table entry. */
147 char *as_name; /* Symbol name. */
148 size_t as_off; /* Offset for this file in the archive. */
149 unsigned long int as_hash; /* Hash value of the name. */
153 /* Descriptor for the ELF file. */
154 typedef struct Elf Elf;
156 /* Descriptor for ELF file section. */
157 typedef struct Elf_Scn Elf_Scn;
164 /* Return descriptor for ELF file to work according to CMD. */
165 extern Elf *elf_begin (int __fildes, Elf_Cmd __cmd, Elf *__ref);
167 /* Create a clone of an existing ELF descriptor. */
168 extern Elf *elf_clone (Elf *__elf, Elf_Cmd __cmd);
170 /* Create descriptor for memory region. */
171 extern Elf *elf_memory (char *__image, size_t __size);
173 /* Advance archive descriptor to next element. */
174 extern Elf_Cmd elf_next (Elf *__elf);
176 /* Free resources allocated for ELF. */
177 extern int elf_end (Elf *__elf);
179 /* Update ELF descriptor and write file to disk. */
180 extern loff_t elf_update (Elf *__elf, Elf_Cmd __cmd);
182 /* Determine what kind of file is associated with ELF. */
183 extern Elf_Kind elf_kind (Elf *__elf) __attribute__ ((__pure__));
185 /* Get the base offset for an object file. */
186 extern loff_t elf_getbase (Elf *__elf);
189 /* Retrieve file identification data. */
190 extern char *elf_getident (Elf *__elf, size_t *__nbytes);
192 /* Retrieve class-dependent object file header. */
193 extern Elf32_Ehdr *elf32_getehdr (Elf *__elf);
194 /* Similar but this time the binary calls is ELFCLASS64. */
195 extern Elf64_Ehdr *elf64_getehdr (Elf *__elf);
197 /* Create ELF header if none exists. */
198 extern Elf32_Ehdr *elf32_newehdr (Elf *__elf);
199 /* Similar but this time the binary calls is ELFCLASS64. */
200 extern Elf64_Ehdr *elf64_newehdr (Elf *__elf);
202 /* Get the number of program headers in the ELF file. If the file uses
203 more headers than can be represented in the e_phnum field of the ELF
204 header the information from the sh_info field in the zeroth section
206 extern int elf_getphdrnum (Elf *__elf, size_t *__dst);
208 /* Retrieve class-dependent program header table. */
209 extern Elf32_Phdr *elf32_getphdr (Elf *__elf);
210 /* Similar but this time the binary calls is ELFCLASS64. */
211 extern Elf64_Phdr *elf64_getphdr (Elf *__elf);
213 /* Create ELF program header. */
214 extern Elf32_Phdr *elf32_newphdr (Elf *__elf, size_t __cnt);
215 /* Similar but this time the binary calls is ELFCLASS64. */
216 extern Elf64_Phdr *elf64_newphdr (Elf *__elf, size_t __cnt);
219 /* Get section at INDEX. */
220 extern Elf_Scn *elf_getscn (Elf *__elf, size_t __index);
222 /* Get section at OFFSET. */
223 extern Elf_Scn *elf32_offscn (Elf *__elf, Elf32_Off __offset);
224 /* Similar bug this time the binary calls is ELFCLASS64. */
225 extern Elf_Scn *elf64_offscn (Elf *__elf, Elf64_Off __offset);
227 /* Get index of section. */
228 extern size_t elf_ndxscn (Elf_Scn *__scn);
230 /* Get section with next section index. */
231 extern Elf_Scn *elf_nextscn (Elf *__elf, Elf_Scn *__scn);
233 /* Create a new section and append it at the end of the table. */
234 extern Elf_Scn *elf_newscn (Elf *__elf);
236 /* Get the section index of the extended section index table for the
237 given symbol table. */
238 extern int elf_scnshndx (Elf_Scn *__scn);
240 /* Get the number of sections in the ELF file. If the file uses more
241 sections than can be represented in the e_shnum field of the ELF
242 header the information from the sh_size field in the zeroth section
244 extern int elf_getshdrnum (Elf *__elf, size_t *__dst);
245 /* Sun messed up the implementation of 'elf_getshnum' in their implementation.
246 It was agreed to make the same functionality available under a different
247 name and obsolete the old name. */
248 extern int elf_getshnum (Elf *__elf, size_t *__dst)
249 __attribute__ ((__deprecated__));
252 /* Get the section index of the section header string table in the ELF
253 file. If the index cannot be represented in the e_shnum field of
254 the ELF header the information from the sh_link field in the zeroth
255 section header is used. */
256 extern int elf_getshdrstrndx (Elf *__elf, size_t *__dst);
257 /* Sun messed up the implementation of 'elf_getshnum' in their implementation.
258 It was agreed to make the same functionality available under a different
259 name and obsolete the old name. */
260 extern int elf_getshstrndx (Elf *__elf, size_t *__dst)
261 __attribute__ ((__deprecated__));
264 /* Retrieve section header of ELFCLASS32 binary. */
265 extern Elf32_Shdr *elf32_getshdr (Elf_Scn *__scn);
266 /* Similar for ELFCLASS64. */
267 extern Elf64_Shdr *elf64_getshdr (Elf_Scn *__scn);
270 /* Set or clear flags for ELF file. */
271 extern unsigned int elf_flagelf (Elf *__elf, Elf_Cmd __cmd,
272 unsigned int __flags);
273 /* Similarly for the ELF header. */
274 extern unsigned int elf_flagehdr (Elf *__elf, Elf_Cmd __cmd,
275 unsigned int __flags);
276 /* Similarly for the ELF program header. */
277 extern unsigned int elf_flagphdr (Elf *__elf, Elf_Cmd __cmd,
278 unsigned int __flags);
279 /* Similarly for the given ELF section. */
280 extern unsigned int elf_flagscn (Elf_Scn *__scn, Elf_Cmd __cmd,
281 unsigned int __flags);
282 /* Similarly for the given ELF data. */
283 extern unsigned int elf_flagdata (Elf_Data *__data, Elf_Cmd __cmd,
284 unsigned int __flags);
285 /* Similarly for the given ELF section header. */
286 extern unsigned int elf_flagshdr (Elf_Scn *__scn, Elf_Cmd __cmd,
287 unsigned int __flags);
290 /* Get data from section while translating from file representation
291 to memory representation. */
292 extern Elf_Data *elf_getdata (Elf_Scn *__scn, Elf_Data *__data);
294 /* Get uninterpreted section content. */
295 extern Elf_Data *elf_rawdata (Elf_Scn *__scn, Elf_Data *__data);
297 /* Create new data descriptor for section SCN. */
298 extern Elf_Data *elf_newdata (Elf_Scn *__scn);
300 /* Get data translated from a chunk of the file contents as section data
301 would be for TYPE. The resulting Elf_Data pointer is valid until
302 elf_end (ELF) is called. */
303 extern Elf_Data *elf_getdata_rawchunk (Elf *__elf,
304 loff_t __offset, size_t __size,
308 /* Return pointer to string at OFFSET in section INDEX. */
309 extern char *elf_strptr (Elf *__elf, size_t __index, size_t __offset);
312 /* Return header of archive. */
313 extern Elf_Arhdr *elf_getarhdr (Elf *__elf);
315 /* Return offset in archive for current file ELF. */
316 extern loff_t elf_getaroff (Elf *__elf);
318 /* Select archive element at OFFSET. */
319 extern size_t elf_rand (Elf *__elf, size_t __offset);
321 /* Get symbol table of archive. */
322 extern Elf_Arsym *elf_getarsym (Elf *__elf, size_t *__narsyms);
325 /* Control ELF descriptor. */
326 extern int elf_cntl (Elf *__elf, Elf_Cmd __cmd);
328 /* Retrieve uninterpreted file contents. */
329 extern char *elf_rawfile (Elf *__elf, size_t *__nbytes);
332 /* Return size of array of COUNT elements of the type denoted by TYPE
333 in the external representation. The binary class is taken from ELF.
334 The result is based on version VERSION of the ELF standard. */
335 extern size_t elf32_fsize (Elf_Type __type, size_t __count,
336 unsigned int __version)
337 __attribute__ ((__const__));
338 /* Similar but this time the binary calls is ELFCLASS64. */
339 extern size_t elf64_fsize (Elf_Type __type, size_t __count,
340 unsigned int __version)
341 __attribute__ ((__const__));
344 /* Convert data structure from the representation in the file represented
345 by ELF to their memory representation. */
346 extern Elf_Data *elf32_xlatetom (Elf_Data *__dest, const Elf_Data *__src,
347 unsigned int __encode);
348 /* Same for 64 bit class. */
349 extern Elf_Data *elf64_xlatetom (Elf_Data *__dest, const Elf_Data *__src,
350 unsigned int __encode);
352 /* Convert data structure from to the representation in memory
353 represented by ELF file representation. */
354 extern Elf_Data *elf32_xlatetof (Elf_Data *__dest, const Elf_Data *__src,
355 unsigned int __encode);
356 /* Same for 64 bit class. */
357 extern Elf_Data *elf64_xlatetof (Elf_Data *__dest, const Elf_Data *__src,
358 unsigned int __encode);
361 /* Return error code of last failing function call. This value is kept
362 separately for each thread. */
363 extern int elf_errno (void);
365 /* Return error string for ERROR. If ERROR is zero, return error string
366 for most recent error or NULL is none occurred. If ERROR is -1 the
367 behaviour is similar to the last case except that not NULL but a legal
368 string is returned. */
369 extern const char *elf_errmsg (int __error);
372 /* Coordinate ELF library and application versions. */
373 extern unsigned int elf_version (unsigned int __version);
375 /* Set fill bytes used to fill holes in data structures. */
376 extern void elf_fill (int __fill);
378 /* Compute hash value. */
379 extern unsigned long int elf_hash (const char *__string)
380 __attribute__ ((__pure__));
382 /* Compute hash value using the GNU-specific hash function. */
383 extern unsigned long int elf_gnu_hash (const char *__string)
384 __attribute__ ((__pure__));
387 /* Compute simple checksum from permanent parts of the ELF file. */
388 extern long int elf32_checksum (Elf *__elf);
389 /* Similar but this time the binary calls is ELFCLASS64. */
390 extern long int elf64_checksum (Elf *__elf);
396 #endif /* libelf.h */