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645f8123 ILT |
1 | // elfcpp_file.h -- file access for elfcpp -*- C++ -*- |
2 | ||
6cb15b7f ILT |
3 | // Copyright 2006, 2007, Free Software Foundation, Inc. |
4 | // Written by Ian Lance Taylor <iant@google.com>. | |
5 | ||
6 | // This file is part of elfcpp. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or | |
9 | // modify it under the terms of the GNU Library General Public License | |
10 | // as published by the Free Software Foundation; either version 2, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // In addition to the permissions in the GNU Library General Public | |
14 | // License, the Free Software Foundation gives you unlimited | |
15 | // permission to link the compiled version of this file into | |
16 | // combinations with other programs, and to distribute those | |
17 | // combinations without any restriction coming from the use of this | |
18 | // file. (The Library Public License restrictions do apply in other | |
19 | // respects; for example, they cover modification of the file, and | |
20 | /// distribution when not linked into a combined executable.) | |
21 | ||
22 | // This program is distributed in the hope that it will be useful, but | |
23 | // WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
25 | // Library General Public License for more details. | |
26 | ||
27 | // You should have received a copy of the GNU Library General Public | |
28 | // License along with this program; if not, write to the Free Software | |
29 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA | |
30 | // 02110-1301, USA. | |
31 | ||
645f8123 ILT |
32 | // This header file defines the class Elf_file which can be used to |
33 | // read useful data from an ELF file. The functions here are all | |
34 | // templates which take a file interface object as a parameter. This | |
35 | // type must have a subtype View. This type must support two methods: | |
36 | // View view(off_t file_offset, off_t data_size) | |
37 | // returns a View for the specified part of the file. | |
38 | // void error(const char* printf_format, ...) | |
39 | // prints an error message and does not return. The subtype View must | |
40 | // support a method | |
41 | // const unsigned char* data() | |
42 | // which returns a pointer to a buffer containing the requested data. | |
43 | // This general interface is used to read data from the file. Objects | |
44 | // of type View will never survive longer than the elfcpp function. | |
45 | ||
46 | // Some of these functions must return a reference to part of the | |
47 | // file. To use these, the file interface must support a subtype | |
48 | // Location: | |
49 | // Location(off_t file_offset, off_t data_size) | |
50 | // To use this in conjunction with the accessors types Shdr, etc., the | |
51 | // file interface should support an overload of view: | |
52 | // View view(Location) | |
53 | // This permits writing | |
54 | // elfcpp::Shdr shdr(file, ef.section_header(n)); | |
55 | ||
c549a694 | 56 | #ifndef ELFCPP_FILE_H |
645f8123 ILT |
57 | #define ELFCPP_FILE_H |
58 | ||
59 | #include <string> | |
c549a694 | 60 | #include <cstdio> |
645f8123 ILT |
61 | #include <cstring> |
62 | ||
63 | namespace elfcpp | |
64 | { | |
65 | ||
c549a694 ILT |
66 | // A simple helper class to recognize if a file has an ELF header. |
67 | ||
68 | class Elf_recognizer | |
69 | { | |
70 | public: | |
71 | // Maximum header size. The user should try to read this much of | |
72 | // the file when using this class. | |
73 | ||
74 | static const int max_header_size = Elf_sizes<64>::ehdr_size; | |
75 | ||
76 | // Checks if the file contains the ELF magic. Other header fields | |
77 | // are not checked. | |
78 | ||
79 | static bool | |
80 | is_elf_file(const unsigned char* ehdr_buf, int size); | |
81 | ||
82 | // Check if EHDR_BUF/BUFSIZE is a valid header of a 32-bit or | |
83 | // 64-bit, little-endian or big-endian ELF file. Assumes | |
84 | // is_elf_file() has been checked to be true. If the header is not | |
85 | // valid, *ERROR contains a human-readable error message. If is is, | |
86 | // *SIZE is set to either 32 or 64, *BIG_ENDIAN is set to indicate | |
87 | // whether the file is big-endian. | |
88 | ||
89 | static bool | |
90 | is_valid_header(const unsigned char* ehdr_buf, off_t bufsize, | |
91 | int* size, bool* big_endian, | |
92 | std::string* error); | |
93 | }; | |
94 | ||
645f8123 ILT |
95 | // This object is used to read an ELF file. |
96 | // SIZE: The size of file, 32 or 64. | |
97 | // BIG_ENDIAN: Whether the file is in big-endian format. | |
98 | // FILE: A file reading type as described above. | |
99 | ||
100 | template<int size, bool big_endian, typename File> | |
101 | class Elf_file | |
102 | { | |
103 | private: | |
104 | typedef Elf_file<size, big_endian, File> This; | |
105 | ||
106 | public: | |
107 | static const int ehdr_size = Elf_sizes<size>::ehdr_size; | |
108 | static const int phdr_size = Elf_sizes<size>::phdr_size; | |
109 | static const int shdr_size = Elf_sizes<size>::shdr_size; | |
110 | static const int sym_size = Elf_sizes<size>::sym_size; | |
111 | static const int rel_size = Elf_sizes<size>::rel_size; | |
112 | static const int rela_size = Elf_sizes<size>::rela_size; | |
113 | ||
114 | typedef Ehdr<size, big_endian> Ef_ehdr; | |
115 | typedef Phdr<size, big_endian> Ef_phdr; | |
116 | typedef Shdr<size, big_endian> Ef_shdr; | |
117 | typedef Sym<size, big_endian> Ef_sym; | |
118 | ||
119 | // Construct an Elf_file given an ELF file header. | |
120 | Elf_file(File* file, const Ef_ehdr& ehdr) | |
121 | { this->construct(file, ehdr); } | |
122 | ||
123 | // Construct an ELF file. | |
124 | inline | |
125 | Elf_file(File* file); | |
126 | ||
127 | // Return the file offset to the section headers. | |
128 | off_t | |
129 | shoff() const | |
130 | { return this->shoff_; } | |
131 | ||
c549a694 ILT |
132 | // Find the first section with an sh_type field equal to TYPE and |
133 | // return its index. Returns SHN_UNDEF if there is no such section. | |
134 | unsigned int | |
135 | find_section_by_type(unsigned int type); | |
136 | ||
645f8123 ILT |
137 | // Return the number of sections. |
138 | unsigned int | |
139 | shnum() | |
140 | { | |
141 | this->initialize_shnum(); | |
142 | return this->shnum_; | |
143 | } | |
144 | ||
145 | // Return the section index of the section name string table. | |
146 | unsigned int | |
147 | shstrndx() | |
148 | { | |
149 | this->initialize_shnum(); | |
150 | return this->shstrndx_; | |
151 | } | |
152 | ||
fa297117 ILT |
153 | // Return the value to subtract from section indexes >= |
154 | // SHN_LORESERVE. See the comment in initialize_shnum. | |
155 | int | |
156 | large_shndx_offset() | |
157 | { | |
158 | this->initialize_shnum(); | |
159 | return this->large_shndx_offset_; | |
160 | } | |
161 | ||
645f8123 ILT |
162 | // Return the location of the header of section SHNDX. |
163 | typename File::Location | |
164 | section_header(unsigned int shndx) | |
165 | { | |
166 | return typename File::Location(this->section_header_offset(shndx), | |
167 | shdr_size); | |
168 | } | |
169 | ||
170 | // Return the name of section SHNDX. | |
171 | std::string | |
172 | section_name(unsigned int shndx); | |
173 | ||
174 | // Return the location of the contents of section SHNDX. | |
175 | typename File::Location | |
176 | section_contents(unsigned int shndx); | |
177 | ||
a445fddf ILT |
178 | // Return the size of section SHNDX. |
179 | typename Elf_types<size>::Elf_WXword | |
180 | section_size(unsigned int shndx); | |
181 | ||
a3ad94ed ILT |
182 | // Return the flags of section SHNDX. |
183 | typename Elf_types<size>::Elf_WXword | |
184 | section_flags(unsigned int shndx); | |
185 | ||
88dd47ac ILT |
186 | // Return the address of section SHNDX. |
187 | typename Elf_types<size>::Elf_Addr | |
188 | section_addr(unsigned int shndx); | |
189 | ||
e698bc31 ILT |
190 | // Return the type of section SHNDX. |
191 | Elf_Word | |
192 | section_type(unsigned int shndx); | |
193 | ||
f7e2ee48 ILT |
194 | // Return the link field of section SHNDX. |
195 | Elf_Word | |
196 | section_link(unsigned int shndx); | |
197 | ||
f2f3f783 ILT |
198 | // Return the info field of section SHNDX. |
199 | Elf_Word | |
200 | section_info(unsigned int shndx); | |
201 | ||
a445fddf ILT |
202 | // Return the addralign field of section SHNDX. |
203 | typename Elf_types<size>::Elf_WXword | |
204 | section_addralign(unsigned int shndx); | |
f2f3f783 | 205 | |
645f8123 ILT |
206 | private: |
207 | // Shared constructor code. | |
208 | void | |
209 | construct(File* file, const Ef_ehdr& ehdr); | |
210 | ||
211 | // Initialize shnum_ and shstrndx_. | |
212 | void | |
213 | initialize_shnum(); | |
214 | ||
215 | // Return the file offset of the header of section SHNDX. | |
216 | off_t | |
217 | section_header_offset(unsigned int shndx); | |
218 | ||
219 | // The file we are reading. | |
220 | File* file_; | |
221 | // The file offset to the section headers. | |
222 | off_t shoff_; | |
223 | // The number of sections. | |
224 | unsigned int shnum_; | |
225 | // The section index of the section name string table. | |
226 | unsigned int shstrndx_; | |
fa297117 ILT |
227 | // Offset to add to sections larger than SHN_LORESERVE. |
228 | int large_shndx_offset_; | |
645f8123 ILT |
229 | }; |
230 | ||
c4aa1e2d ILT |
231 | // A small wrapper around SHT_STRTAB data mapped to memory. It checks that the |
232 | // index is not out of bounds and the string is NULL-terminated. | |
233 | ||
234 | class Elf_strtab | |
235 | { | |
236 | public: | |
237 | // Construct an Elf_strtab for a section with contents *P and size SIZE. | |
238 | Elf_strtab(const unsigned char* p, size_t size); | |
239 | ||
240 | // Return the file offset to the section headers. | |
241 | bool | |
242 | get_c_string(size_t offset, const char** cstring) const | |
243 | { | |
244 | if (offset >= this->usable_size_) | |
245 | return false; | |
246 | *cstring = this->base_ + offset; | |
247 | return true; | |
248 | } | |
249 | ||
250 | private: | |
251 | // Contents of the section mapped to memory. | |
252 | const char* base_; | |
253 | // One larger that the position of the last NULL character in the section. | |
254 | // For valid SHT_STRTAB sections, this is the size of the section. | |
255 | size_t usable_size_; | |
256 | }; | |
257 | ||
c549a694 ILT |
258 | // Inline function definitions. |
259 | ||
260 | // Check for presence of the ELF magic number. | |
261 | ||
262 | inline bool | |
263 | Elf_recognizer::is_elf_file(const unsigned char* ehdr_buf, int size) | |
264 | { | |
265 | if (size < 4) | |
266 | return false; | |
267 | ||
268 | static unsigned char elfmagic[4] = | |
269 | { | |
270 | elfcpp::ELFMAG0, elfcpp::ELFMAG1, | |
271 | elfcpp::ELFMAG2, elfcpp::ELFMAG3 | |
272 | }; | |
273 | return memcmp(ehdr_buf, elfmagic, 4) == 0; | |
274 | } | |
275 | ||
276 | namespace | |
277 | { | |
278 | ||
279 | // Print a number to a string. | |
280 | ||
281 | inline std::string | |
282 | internal_printf_int(const char* format, int arg) | |
283 | { | |
284 | char buf[256]; | |
285 | snprintf(buf, sizeof(buf), format, arg); | |
286 | return std::string(buf); | |
287 | } | |
288 | ||
289 | } // End anonymous namespace. | |
290 | ||
291 | // Check the validity of the ELF header. | |
292 | ||
293 | inline bool | |
294 | Elf_recognizer::is_valid_header( | |
295 | const unsigned char* ehdr_buf, | |
296 | off_t bufsize, | |
297 | int* size, | |
298 | bool* big_endian, | |
299 | std::string* error) | |
300 | { | |
301 | if (bufsize < elfcpp::EI_NIDENT) | |
302 | { | |
303 | *error = _("ELF file too short"); | |
304 | return false; | |
305 | } | |
306 | ||
307 | int v = ehdr_buf[elfcpp::EI_VERSION]; | |
308 | if (v != elfcpp::EV_CURRENT) | |
309 | { | |
310 | if (v == elfcpp::EV_NONE) | |
311 | *error = _("invalid ELF version 0"); | |
312 | else | |
313 | *error = internal_printf_int(_("unsupported ELF version %d"), v); | |
314 | return false; | |
315 | } | |
316 | ||
317 | int c = ehdr_buf[elfcpp::EI_CLASS]; | |
318 | if (c == elfcpp::ELFCLASSNONE) | |
319 | { | |
320 | *error = _("invalid ELF class 0"); | |
321 | return false; | |
322 | } | |
323 | else if (c != elfcpp::ELFCLASS32 | |
324 | && c != elfcpp::ELFCLASS64) | |
325 | { | |
326 | *error = internal_printf_int(_("unsupported ELF class %d"), c); | |
327 | return false; | |
328 | } | |
329 | ||
330 | int d = ehdr_buf[elfcpp::EI_DATA]; | |
331 | if (d == elfcpp::ELFDATANONE) | |
332 | { | |
333 | *error = _("invalid ELF data encoding"); | |
334 | return false; | |
335 | } | |
336 | else if (d != elfcpp::ELFDATA2LSB | |
337 | && d != elfcpp::ELFDATA2MSB) | |
338 | { | |
339 | *error = internal_printf_int(_("unsupported ELF data encoding %d"), d); | |
340 | return false; | |
341 | } | |
342 | ||
343 | *big_endian = (d == elfcpp::ELFDATA2MSB); | |
344 | ||
345 | if (c == elfcpp::ELFCLASS32) | |
346 | { | |
347 | if (bufsize < elfcpp::Elf_sizes<32>::ehdr_size) | |
348 | { | |
349 | *error = _("ELF file too short"); | |
350 | return false; | |
351 | } | |
352 | *size = 32; | |
353 | } | |
354 | else | |
355 | { | |
356 | if (bufsize < elfcpp::Elf_sizes<64>::ehdr_size) | |
357 | { | |
358 | *error = _("ELF file too short"); | |
359 | return false; | |
360 | } | |
361 | *size = 64; | |
362 | } | |
363 | ||
364 | return true; | |
365 | } | |
366 | ||
645f8123 ILT |
367 | // Template function definitions. |
368 | ||
369 | // Construct an Elf_file given an ELF file header. | |
370 | ||
371 | template<int size, bool big_endian, typename File> | |
372 | void | |
373 | Elf_file<size, big_endian, File>::construct(File* file, const Ef_ehdr& ehdr) | |
374 | { | |
375 | this->file_ = file; | |
376 | this->shoff_ = ehdr.get_e_shoff(); | |
377 | this->shnum_ = ehdr.get_e_shnum(); | |
378 | this->shstrndx_ = ehdr.get_e_shstrndx(); | |
fa297117 | 379 | this->large_shndx_offset_ = 0; |
645f8123 ILT |
380 | if (ehdr.get_e_ehsize() != This::ehdr_size) |
381 | file->error(_("bad e_ehsize (%d != %d)"), | |
382 | ehdr.get_e_ehsize(), This::ehdr_size); | |
383 | if (ehdr.get_e_shentsize() != This::shdr_size) | |
384 | file->error(_("bad e_shentsize (%d != %d)"), | |
385 | ehdr.get_e_shentsize(), This::shdr_size); | |
386 | } | |
387 | ||
388 | // Construct an ELF file. | |
389 | ||
390 | template<int size, bool big_endian, typename File> | |
391 | inline | |
392 | Elf_file<size, big_endian, File>::Elf_file(File* file) | |
393 | { | |
394 | typename File::View v(file->view(file_header_offset, This::ehdr_size)); | |
395 | this->construct(file, Ef_ehdr(v.data())); | |
396 | } | |
397 | ||
398 | // Initialize the shnum_ and shstrndx_ fields, handling overflow. | |
399 | ||
400 | template<int size, bool big_endian, typename File> | |
401 | void | |
402 | Elf_file<size, big_endian, File>::initialize_shnum() | |
403 | { | |
404 | if ((this->shnum_ == 0 || this->shstrndx_ == SHN_XINDEX) | |
405 | && this->shoff_ != 0) | |
406 | { | |
407 | typename File::View v(this->file_->view(this->shoff_, This::shdr_size)); | |
408 | Ef_shdr shdr(v.data()); | |
fa297117 | 409 | |
645f8123 ILT |
410 | if (this->shnum_ == 0) |
411 | this->shnum_ = shdr.get_sh_size(); | |
fa297117 | 412 | |
645f8123 | 413 | if (this->shstrndx_ == SHN_XINDEX) |
fa297117 ILT |
414 | { |
415 | this->shstrndx_ = shdr.get_sh_link(); | |
416 | ||
417 | // Versions of the GNU binutils between 2.12 and 2.18 did | |
418 | // not handle objects with more than SHN_LORESERVE sections | |
419 | // correctly. All large section indexes were offset by | |
420 | // 0x100. Some information can be found here: | |
421 | // http://sourceware.org/bugzilla/show_bug.cgi?id=5900 . | |
422 | // Fortunately these object files are easy to detect, as the | |
423 | // GNU binutils always put the section header string table | |
424 | // near the end of the list of sections. Thus if the | |
425 | // section header string table index is larger than the | |
426 | // number of sections, then we know we have to subtract | |
427 | // 0x100 to get the real section index. | |
428 | if (this->shstrndx_ >= this->shnum_) | |
429 | { | |
430 | if (this->shstrndx_ >= elfcpp::SHN_LORESERVE + 0x100) | |
431 | { | |
432 | this->large_shndx_offset_ = - 0x100; | |
433 | this->shstrndx_ -= 0x100; | |
434 | } | |
435 | if (this->shstrndx_ >= this->shnum_) | |
436 | this->file_->error(_("bad shstrndx: %u >= %u"), | |
437 | this->shstrndx_, this->shnum_); | |
438 | } | |
439 | } | |
645f8123 ILT |
440 | } |
441 | } | |
442 | ||
c549a694 ILT |
443 | // Find section with sh_type equal to TYPE and return its index. |
444 | // Returns SHN_UNDEF if not found. | |
445 | ||
446 | template<int size, bool big_endian, typename File> | |
447 | unsigned int | |
448 | Elf_file<size, big_endian, File>::find_section_by_type(unsigned int type) | |
449 | { | |
450 | unsigned int shnum = this->shnum(); | |
451 | typename File::View v(this->file_->view(this->shoff_, | |
452 | This::shdr_size * shnum)); | |
453 | for (unsigned int i = 0; i < shnum; i++) | |
454 | { | |
455 | Ef_shdr shdr(v.data() + This::shdr_size * i); | |
456 | if (shdr.get_sh_type() == type) | |
457 | return i; | |
458 | } | |
459 | return SHN_UNDEF; | |
460 | } | |
461 | ||
645f8123 ILT |
462 | // Return the file offset of the section header of section SHNDX. |
463 | ||
464 | template<int size, bool big_endian, typename File> | |
465 | off_t | |
466 | Elf_file<size, big_endian, File>::section_header_offset(unsigned int shndx) | |
467 | { | |
468 | if (shndx >= this->shnum()) | |
469 | this->file_->error(_("section_header_offset: bad shndx %u >= %u"), | |
470 | shndx, this->shnum()); | |
471 | return this->shoff_ + This::shdr_size * shndx; | |
472 | } | |
473 | ||
474 | // Return the name of section SHNDX. | |
475 | ||
476 | template<int size, bool big_endian, typename File> | |
477 | std::string | |
478 | Elf_file<size, big_endian, File>::section_name(unsigned int shndx) | |
479 | { | |
480 | File* const file = this->file_; | |
481 | ||
482 | // Get the section name offset. | |
483 | unsigned int sh_name; | |
484 | { | |
485 | typename File::View v(file->view(this->section_header_offset(shndx), | |
486 | This::shdr_size)); | |
487 | Ef_shdr shdr(v.data()); | |
488 | sh_name = shdr.get_sh_name(); | |
489 | } | |
490 | ||
491 | // Get the file offset for the section name string table data. | |
492 | off_t shstr_off; | |
20e5b5c0 | 493 | typename Elf_types<size>::Elf_WXword shstr_size; |
645f8123 ILT |
494 | { |
495 | const unsigned int shstrndx = this->shstrndx_; | |
496 | typename File::View v(file->view(this->section_header_offset(shstrndx), | |
497 | This::shdr_size)); | |
498 | Ef_shdr shstr_shdr(v.data()); | |
499 | shstr_off = shstr_shdr.get_sh_offset(); | |
500 | shstr_size = shstr_shdr.get_sh_size(); | |
501 | } | |
502 | ||
503 | if (sh_name >= shstr_size) | |
504 | file->error(_("bad section name offset for section %u: %u"), | |
505 | shndx, sh_name); | |
506 | ||
507 | typename File::View v(file->view(shstr_off, shstr_size)); | |
508 | ||
509 | const unsigned char* datau = v.data(); | |
510 | const char* data = reinterpret_cast<const char*>(datau); | |
511 | const void* p = ::memchr(data + sh_name, '\0', shstr_size - sh_name); | |
512 | if (p == NULL) | |
513 | file->error(_("missing null terminator for name of section %u"), | |
514 | shndx); | |
515 | ||
516 | size_t len = static_cast<const char*>(p) - (data + sh_name); | |
517 | ||
518 | return std::string(data + sh_name, len); | |
519 | } | |
520 | ||
521 | // Return the contents of section SHNDX. | |
522 | ||
523 | template<int size, bool big_endian, typename File> | |
524 | typename File::Location | |
525 | Elf_file<size, big_endian, File>::section_contents(unsigned int shndx) | |
526 | { | |
527 | File* const file = this->file_; | |
528 | ||
529 | if (shndx >= this->shnum()) | |
530 | file->error(_("section_contents: bad shndx %u >= %u"), | |
531 | shndx, this->shnum()); | |
532 | ||
533 | typename File::View v(file->view(this->section_header_offset(shndx), | |
534 | This::shdr_size)); | |
535 | Ef_shdr shdr(v.data()); | |
536 | return typename File::Location(shdr.get_sh_offset(), shdr.get_sh_size()); | |
537 | } | |
538 | ||
a445fddf ILT |
539 | // Get the size of section SHNDX. |
540 | ||
541 | template<int size, bool big_endian, typename File> | |
542 | typename Elf_types<size>::Elf_WXword | |
543 | Elf_file<size, big_endian, File>::section_size(unsigned int shndx) | |
544 | { | |
545 | File* const file = this->file_; | |
546 | ||
547 | if (shndx >= this->shnum()) | |
548 | file->error(_("section_size: bad shndx %u >= %u"), | |
549 | shndx, this->shnum()); | |
550 | ||
551 | typename File::View v(file->view(this->section_header_offset(shndx), | |
552 | This::shdr_size)); | |
553 | ||
554 | Ef_shdr shdr(v.data()); | |
555 | return shdr.get_sh_size(); | |
556 | } | |
557 | ||
a3ad94ed ILT |
558 | // Return the section flags of section SHNDX. |
559 | ||
560 | template<int size, bool big_endian, typename File> | |
561 | typename Elf_types<size>::Elf_WXword | |
562 | Elf_file<size, big_endian, File>::section_flags(unsigned int shndx) | |
563 | { | |
564 | File* const file = this->file_; | |
565 | ||
566 | if (shndx >= this->shnum()) | |
567 | file->error(_("section_flags: bad shndx %u >= %u"), | |
568 | shndx, this->shnum()); | |
569 | ||
570 | typename File::View v(file->view(this->section_header_offset(shndx), | |
571 | This::shdr_size)); | |
572 | ||
573 | Ef_shdr shdr(v.data()); | |
574 | return shdr.get_sh_flags(); | |
575 | } | |
576 | ||
88dd47ac ILT |
577 | // Return the address of section SHNDX. |
578 | ||
579 | template<int size, bool big_endian, typename File> | |
580 | typename Elf_types<size>::Elf_Addr | |
581 | Elf_file<size, big_endian, File>::section_addr(unsigned int shndx) | |
582 | { | |
583 | File* const file = this->file_; | |
584 | ||
585 | if (shndx >= this->shnum()) | |
586 | file->error(_("section_flags: bad shndx %u >= %u"), | |
587 | shndx, this->shnum()); | |
588 | ||
589 | typename File::View v(file->view(this->section_header_offset(shndx), | |
590 | This::shdr_size)); | |
591 | ||
592 | Ef_shdr shdr(v.data()); | |
593 | return shdr.get_sh_addr(); | |
594 | } | |
595 | ||
e698bc31 ILT |
596 | // Return the type of section SHNDX. |
597 | ||
598 | template<int size, bool big_endian, typename File> | |
599 | Elf_Word | |
600 | Elf_file<size, big_endian, File>::section_type(unsigned int shndx) | |
601 | { | |
602 | File* const file = this->file_; | |
603 | ||
604 | if (shndx >= this->shnum()) | |
605 | file->error(_("section_type: bad shndx %u >= %u"), | |
606 | shndx, this->shnum()); | |
607 | ||
608 | typename File::View v(file->view(this->section_header_offset(shndx), | |
609 | This::shdr_size)); | |
610 | ||
611 | Ef_shdr shdr(v.data()); | |
612 | return shdr.get_sh_type(); | |
613 | } | |
614 | ||
f7e2ee48 ILT |
615 | // Return the sh_link field of section SHNDX. |
616 | ||
617 | template<int size, bool big_endian, typename File> | |
618 | Elf_Word | |
619 | Elf_file<size, big_endian, File>::section_link(unsigned int shndx) | |
620 | { | |
621 | File* const file = this->file_; | |
622 | ||
623 | if (shndx >= this->shnum()) | |
624 | file->error(_("section_link: bad shndx %u >= %u"), | |
625 | shndx, this->shnum()); | |
626 | ||
627 | typename File::View v(file->view(this->section_header_offset(shndx), | |
628 | This::shdr_size)); | |
629 | ||
630 | Ef_shdr shdr(v.data()); | |
631 | return shdr.get_sh_link(); | |
632 | } | |
633 | ||
f2f3f783 ILT |
634 | // Return the sh_info field of section SHNDX. |
635 | ||
636 | template<int size, bool big_endian, typename File> | |
637 | Elf_Word | |
638 | Elf_file<size, big_endian, File>::section_info(unsigned int shndx) | |
639 | { | |
640 | File* const file = this->file_; | |
641 | ||
642 | if (shndx >= this->shnum()) | |
643 | file->error(_("section_info: bad shndx %u >= %u"), | |
644 | shndx, this->shnum()); | |
645 | ||
646 | typename File::View v(file->view(this->section_header_offset(shndx), | |
647 | This::shdr_size)); | |
648 | ||
649 | Ef_shdr shdr(v.data()); | |
650 | return shdr.get_sh_info(); | |
651 | } | |
652 | ||
a445fddf ILT |
653 | // Return the sh_addralign field of section SHNDX. |
654 | ||
655 | template<int size, bool big_endian, typename File> | |
656 | typename Elf_types<size>::Elf_WXword | |
657 | Elf_file<size, big_endian, File>::section_addralign(unsigned int shndx) | |
658 | { | |
659 | File* const file = this->file_; | |
660 | ||
661 | if (shndx >= this->shnum()) | |
662 | file->error(_("section_addralign: bad shndx %u >= %u"), | |
663 | shndx, this->shnum()); | |
664 | ||
665 | typename File::View v(file->view(this->section_header_offset(shndx), | |
666 | This::shdr_size)); | |
667 | ||
668 | Ef_shdr shdr(v.data()); | |
669 | return shdr.get_sh_addralign(); | |
670 | } | |
671 | ||
c4aa1e2d ILT |
672 | inline |
673 | Elf_strtab::Elf_strtab(const unsigned char* p, size_t size) | |
674 | { | |
675 | // Check if the section is NUL-terminated. If it isn't, we ignore | |
676 | // the last part to make sure we don't return non-NUL-terminated | |
677 | // strings. | |
678 | while (size > 0 && p[size - 1] != 0) | |
679 | size--; | |
680 | this->base_ = reinterpret_cast<const char*>(p); | |
681 | this->usable_size_ = size; | |
682 | } | |
683 | ||
645f8123 ILT |
684 | } // End namespace elfcpp. |
685 | ||
686 | #endif // !defined(ELFCPP_FILE_H) |