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645f8123 ILT |
1 | // elfcpp_file.h -- file access for elfcpp -*- C++ -*- |
2 | ||
b3adc24a | 3 | // Copyright (C) 2006-2020 Free Software Foundation, Inc. |
6cb15b7f ILT |
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 | ||
e2b8f3c4 RÁE |
63 | #include "elfcpp.h" |
64 | ||
645f8123 ILT |
65 | namespace elfcpp |
66 | { | |
67 | ||
c549a694 ILT |
68 | // A simple helper class to recognize if a file has an ELF header. |
69 | ||
70 | class Elf_recognizer | |
71 | { | |
72 | public: | |
73 | // Maximum header size. The user should try to read this much of | |
74 | // the file when using this class. | |
75 | ||
76 | static const int max_header_size = Elf_sizes<64>::ehdr_size; | |
77 | ||
78 | // Checks if the file contains the ELF magic. Other header fields | |
79 | // are not checked. | |
80 | ||
81 | static bool | |
82 | is_elf_file(const unsigned char* ehdr_buf, int size); | |
83 | ||
84 | // Check if EHDR_BUF/BUFSIZE is a valid header of a 32-bit or | |
85 | // 64-bit, little-endian or big-endian ELF file. Assumes | |
86 | // is_elf_file() has been checked to be true. If the header is not | |
87 | // valid, *ERROR contains a human-readable error message. If is is, | |
88 | // *SIZE is set to either 32 or 64, *BIG_ENDIAN is set to indicate | |
89 | // whether the file is big-endian. | |
90 | ||
91 | static bool | |
92 | is_valid_header(const unsigned char* ehdr_buf, off_t bufsize, | |
93 | int* size, bool* big_endian, | |
94 | std::string* error); | |
95 | }; | |
96 | ||
645f8123 ILT |
97 | // This object is used to read an ELF file. |
98 | // SIZE: The size of file, 32 or 64. | |
99 | // BIG_ENDIAN: Whether the file is in big-endian format. | |
100 | // FILE: A file reading type as described above. | |
101 | ||
102 | template<int size, bool big_endian, typename File> | |
103 | class Elf_file | |
104 | { | |
105 | private: | |
106 | typedef Elf_file<size, big_endian, File> This; | |
107 | ||
108 | public: | |
109 | static const int ehdr_size = Elf_sizes<size>::ehdr_size; | |
110 | static const int phdr_size = Elf_sizes<size>::phdr_size; | |
111 | static const int shdr_size = Elf_sizes<size>::shdr_size; | |
112 | static const int sym_size = Elf_sizes<size>::sym_size; | |
113 | static const int rel_size = Elf_sizes<size>::rel_size; | |
114 | static const int rela_size = Elf_sizes<size>::rela_size; | |
115 | ||
116 | typedef Ehdr<size, big_endian> Ef_ehdr; | |
117 | typedef Phdr<size, big_endian> Ef_phdr; | |
118 | typedef Shdr<size, big_endian> Ef_shdr; | |
119 | typedef Sym<size, big_endian> Ef_sym; | |
120 | ||
121 | // Construct an Elf_file given an ELF file header. | |
122 | Elf_file(File* file, const Ef_ehdr& ehdr) | |
123 | { this->construct(file, ehdr); } | |
124 | ||
125 | // Construct an ELF file. | |
126 | inline | |
127 | Elf_file(File* file); | |
128 | ||
129 | // Return the file offset to the section headers. | |
130 | off_t | |
131 | shoff() const | |
132 | { return this->shoff_; } | |
133 | ||
c549a694 ILT |
134 | // Find the first section with an sh_type field equal to TYPE and |
135 | // return its index. Returns SHN_UNDEF if there is no such section. | |
136 | unsigned int | |
137 | find_section_by_type(unsigned int type); | |
138 | ||
645f8123 ILT |
139 | // Return the number of sections. |
140 | unsigned int | |
141 | shnum() | |
142 | { | |
143 | this->initialize_shnum(); | |
144 | return this->shnum_; | |
145 | } | |
146 | ||
54674d38 CC |
147 | unsigned int |
148 | shnum() const | |
149 | { | |
150 | if (this->shnum_ == 0 && this->shoff_ != 0) | |
151 | this->file_->error(_("ELF file has not been initialized yet" | |
152 | " (internal error)")); | |
153 | return this->shnum_; | |
154 | } | |
155 | ||
645f8123 ILT |
156 | // Return the section index of the section name string table. |
157 | unsigned int | |
158 | shstrndx() | |
159 | { | |
160 | this->initialize_shnum(); | |
161 | return this->shstrndx_; | |
162 | } | |
163 | ||
54674d38 CC |
164 | unsigned int |
165 | shstrndx() const | |
166 | { | |
167 | if (this->shstrndx_ == SHN_XINDEX && this->shoff_ != 0) | |
168 | { | |
169 | this->file_->error(_("ELF file has not been initialized yet" | |
170 | " (internal error)")); | |
171 | return 0; | |
172 | } | |
173 | return this->shstrndx_; | |
174 | } | |
175 | ||
fa297117 ILT |
176 | // Return the value to subtract from section indexes >= |
177 | // SHN_LORESERVE. See the comment in initialize_shnum. | |
178 | int | |
179 | large_shndx_offset() | |
180 | { | |
181 | this->initialize_shnum(); | |
182 | return this->large_shndx_offset_; | |
183 | } | |
184 | ||
54674d38 CC |
185 | int |
186 | large_shndx_offset() const | |
187 | { | |
188 | if (this->shstrndx_ == SHN_XINDEX && this->shoff_ != 0) | |
189 | this->file_->error(_("ELF file has not been initialized yet" | |
190 | " (internal error)")); | |
191 | return this->large_shndx_offset_; | |
192 | } | |
193 | ||
645f8123 ILT |
194 | // Return the location of the header of section SHNDX. |
195 | typename File::Location | |
196 | section_header(unsigned int shndx) | |
197 | { | |
198 | return typename File::Location(this->section_header_offset(shndx), | |
199 | shdr_size); | |
200 | } | |
201 | ||
202 | // Return the name of section SHNDX. | |
203 | std::string | |
54674d38 | 204 | section_name(unsigned int shndx) const; |
645f8123 ILT |
205 | |
206 | // Return the location of the contents of section SHNDX. | |
207 | typename File::Location | |
208 | section_contents(unsigned int shndx); | |
209 | ||
a445fddf ILT |
210 | // Return the size of section SHNDX. |
211 | typename Elf_types<size>::Elf_WXword | |
212 | section_size(unsigned int shndx); | |
213 | ||
a3ad94ed ILT |
214 | // Return the flags of section SHNDX. |
215 | typename Elf_types<size>::Elf_WXword | |
216 | section_flags(unsigned int shndx); | |
217 | ||
88dd47ac ILT |
218 | // Return the address of section SHNDX. |
219 | typename Elf_types<size>::Elf_Addr | |
220 | section_addr(unsigned int shndx); | |
221 | ||
e698bc31 ILT |
222 | // Return the type of section SHNDX. |
223 | Elf_Word | |
224 | section_type(unsigned int shndx); | |
225 | ||
f7e2ee48 ILT |
226 | // Return the link field of section SHNDX. |
227 | Elf_Word | |
228 | section_link(unsigned int shndx); | |
229 | ||
f2f3f783 ILT |
230 | // Return the info field of section SHNDX. |
231 | Elf_Word | |
232 | section_info(unsigned int shndx); | |
233 | ||
a445fddf ILT |
234 | // Return the addralign field of section SHNDX. |
235 | typename Elf_types<size>::Elf_WXword | |
236 | section_addralign(unsigned int shndx); | |
f2f3f783 | 237 | |
645f8123 ILT |
238 | private: |
239 | // Shared constructor code. | |
240 | void | |
241 | construct(File* file, const Ef_ehdr& ehdr); | |
242 | ||
243 | // Initialize shnum_ and shstrndx_. | |
244 | void | |
245 | initialize_shnum(); | |
246 | ||
247 | // Return the file offset of the header of section SHNDX. | |
248 | off_t | |
54674d38 | 249 | section_header_offset(unsigned int shndx) const; |
645f8123 ILT |
250 | |
251 | // The file we are reading. | |
252 | File* file_; | |
253 | // The file offset to the section headers. | |
254 | off_t shoff_; | |
255 | // The number of sections. | |
256 | unsigned int shnum_; | |
257 | // The section index of the section name string table. | |
258 | unsigned int shstrndx_; | |
fa297117 ILT |
259 | // Offset to add to sections larger than SHN_LORESERVE. |
260 | int large_shndx_offset_; | |
645f8123 ILT |
261 | }; |
262 | ||
c4aa1e2d ILT |
263 | // A small wrapper around SHT_STRTAB data mapped to memory. It checks that the |
264 | // index is not out of bounds and the string is NULL-terminated. | |
265 | ||
266 | class Elf_strtab | |
267 | { | |
268 | public: | |
269 | // Construct an Elf_strtab for a section with contents *P and size SIZE. | |
270 | Elf_strtab(const unsigned char* p, size_t size); | |
271 | ||
272 | // Return the file offset to the section headers. | |
273 | bool | |
274 | get_c_string(size_t offset, const char** cstring) const | |
275 | { | |
276 | if (offset >= this->usable_size_) | |
277 | return false; | |
278 | *cstring = this->base_ + offset; | |
279 | return true; | |
280 | } | |
281 | ||
282 | private: | |
283 | // Contents of the section mapped to memory. | |
284 | const char* base_; | |
285 | // One larger that the position of the last NULL character in the section. | |
286 | // For valid SHT_STRTAB sections, this is the size of the section. | |
287 | size_t usable_size_; | |
288 | }; | |
289 | ||
c549a694 ILT |
290 | // Inline function definitions. |
291 | ||
292 | // Check for presence of the ELF magic number. | |
293 | ||
294 | inline bool | |
295 | Elf_recognizer::is_elf_file(const unsigned char* ehdr_buf, int size) | |
296 | { | |
297 | if (size < 4) | |
298 | return false; | |
299 | ||
300 | static unsigned char elfmagic[4] = | |
301 | { | |
302 | elfcpp::ELFMAG0, elfcpp::ELFMAG1, | |
303 | elfcpp::ELFMAG2, elfcpp::ELFMAG3 | |
304 | }; | |
305 | return memcmp(ehdr_buf, elfmagic, 4) == 0; | |
306 | } | |
307 | ||
308 | namespace | |
309 | { | |
310 | ||
311 | // Print a number to a string. | |
312 | ||
313 | inline std::string | |
314 | internal_printf_int(const char* format, int arg) | |
315 | { | |
316 | char buf[256]; | |
317 | snprintf(buf, sizeof(buf), format, arg); | |
318 | return std::string(buf); | |
319 | } | |
320 | ||
321 | } // End anonymous namespace. | |
322 | ||
323 | // Check the validity of the ELF header. | |
324 | ||
325 | inline bool | |
326 | Elf_recognizer::is_valid_header( | |
327 | const unsigned char* ehdr_buf, | |
328 | off_t bufsize, | |
329 | int* size, | |
330 | bool* big_endian, | |
331 | std::string* error) | |
332 | { | |
333 | if (bufsize < elfcpp::EI_NIDENT) | |
334 | { | |
335 | *error = _("ELF file too short"); | |
336 | return false; | |
337 | } | |
338 | ||
339 | int v = ehdr_buf[elfcpp::EI_VERSION]; | |
340 | if (v != elfcpp::EV_CURRENT) | |
341 | { | |
342 | if (v == elfcpp::EV_NONE) | |
343 | *error = _("invalid ELF version 0"); | |
344 | else | |
345 | *error = internal_printf_int(_("unsupported ELF version %d"), v); | |
346 | return false; | |
347 | } | |
348 | ||
349 | int c = ehdr_buf[elfcpp::EI_CLASS]; | |
350 | if (c == elfcpp::ELFCLASSNONE) | |
351 | { | |
352 | *error = _("invalid ELF class 0"); | |
353 | return false; | |
354 | } | |
355 | else if (c != elfcpp::ELFCLASS32 | |
356 | && c != elfcpp::ELFCLASS64) | |
357 | { | |
358 | *error = internal_printf_int(_("unsupported ELF class %d"), c); | |
359 | return false; | |
360 | } | |
361 | ||
362 | int d = ehdr_buf[elfcpp::EI_DATA]; | |
363 | if (d == elfcpp::ELFDATANONE) | |
364 | { | |
365 | *error = _("invalid ELF data encoding"); | |
366 | return false; | |
367 | } | |
368 | else if (d != elfcpp::ELFDATA2LSB | |
369 | && d != elfcpp::ELFDATA2MSB) | |
370 | { | |
371 | *error = internal_printf_int(_("unsupported ELF data encoding %d"), d); | |
372 | return false; | |
373 | } | |
374 | ||
375 | *big_endian = (d == elfcpp::ELFDATA2MSB); | |
376 | ||
377 | if (c == elfcpp::ELFCLASS32) | |
378 | { | |
379 | if (bufsize < elfcpp::Elf_sizes<32>::ehdr_size) | |
380 | { | |
381 | *error = _("ELF file too short"); | |
382 | return false; | |
383 | } | |
384 | *size = 32; | |
385 | } | |
386 | else | |
387 | { | |
388 | if (bufsize < elfcpp::Elf_sizes<64>::ehdr_size) | |
389 | { | |
390 | *error = _("ELF file too short"); | |
391 | return false; | |
392 | } | |
393 | *size = 64; | |
394 | } | |
395 | ||
396 | return true; | |
397 | } | |
398 | ||
645f8123 ILT |
399 | // Template function definitions. |
400 | ||
401 | // Construct an Elf_file given an ELF file header. | |
402 | ||
403 | template<int size, bool big_endian, typename File> | |
404 | void | |
405 | Elf_file<size, big_endian, File>::construct(File* file, const Ef_ehdr& ehdr) | |
406 | { | |
407 | this->file_ = file; | |
408 | this->shoff_ = ehdr.get_e_shoff(); | |
409 | this->shnum_ = ehdr.get_e_shnum(); | |
410 | this->shstrndx_ = ehdr.get_e_shstrndx(); | |
fa297117 | 411 | this->large_shndx_offset_ = 0; |
645f8123 ILT |
412 | if (ehdr.get_e_ehsize() != This::ehdr_size) |
413 | file->error(_("bad e_ehsize (%d != %d)"), | |
414 | ehdr.get_e_ehsize(), This::ehdr_size); | |
415 | if (ehdr.get_e_shentsize() != This::shdr_size) | |
416 | file->error(_("bad e_shentsize (%d != %d)"), | |
417 | ehdr.get_e_shentsize(), This::shdr_size); | |
418 | } | |
419 | ||
420 | // Construct an ELF file. | |
421 | ||
422 | template<int size, bool big_endian, typename File> | |
423 | inline | |
424 | Elf_file<size, big_endian, File>::Elf_file(File* file) | |
425 | { | |
426 | typename File::View v(file->view(file_header_offset, This::ehdr_size)); | |
427 | this->construct(file, Ef_ehdr(v.data())); | |
428 | } | |
429 | ||
430 | // Initialize the shnum_ and shstrndx_ fields, handling overflow. | |
431 | ||
432 | template<int size, bool big_endian, typename File> | |
433 | void | |
434 | Elf_file<size, big_endian, File>::initialize_shnum() | |
435 | { | |
436 | if ((this->shnum_ == 0 || this->shstrndx_ == SHN_XINDEX) | |
437 | && this->shoff_ != 0) | |
438 | { | |
439 | typename File::View v(this->file_->view(this->shoff_, This::shdr_size)); | |
440 | Ef_shdr shdr(v.data()); | |
fa297117 | 441 | |
645f8123 ILT |
442 | if (this->shnum_ == 0) |
443 | this->shnum_ = shdr.get_sh_size(); | |
fa297117 | 444 | |
645f8123 | 445 | if (this->shstrndx_ == SHN_XINDEX) |
fa297117 ILT |
446 | { |
447 | this->shstrndx_ = shdr.get_sh_link(); | |
448 | ||
449 | // Versions of the GNU binutils between 2.12 and 2.18 did | |
450 | // not handle objects with more than SHN_LORESERVE sections | |
451 | // correctly. All large section indexes were offset by | |
452 | // 0x100. Some information can be found here: | |
453 | // http://sourceware.org/bugzilla/show_bug.cgi?id=5900 . | |
454 | // Fortunately these object files are easy to detect, as the | |
455 | // GNU binutils always put the section header string table | |
456 | // near the end of the list of sections. Thus if the | |
457 | // section header string table index is larger than the | |
458 | // number of sections, then we know we have to subtract | |
459 | // 0x100 to get the real section index. | |
460 | if (this->shstrndx_ >= this->shnum_) | |
461 | { | |
462 | if (this->shstrndx_ >= elfcpp::SHN_LORESERVE + 0x100) | |
463 | { | |
464 | this->large_shndx_offset_ = - 0x100; | |
465 | this->shstrndx_ -= 0x100; | |
466 | } | |
467 | if (this->shstrndx_ >= this->shnum_) | |
468 | this->file_->error(_("bad shstrndx: %u >= %u"), | |
469 | this->shstrndx_, this->shnum_); | |
470 | } | |
471 | } | |
645f8123 ILT |
472 | } |
473 | } | |
474 | ||
c549a694 ILT |
475 | // Find section with sh_type equal to TYPE and return its index. |
476 | // Returns SHN_UNDEF if not found. | |
477 | ||
478 | template<int size, bool big_endian, typename File> | |
479 | unsigned int | |
480 | Elf_file<size, big_endian, File>::find_section_by_type(unsigned int type) | |
481 | { | |
501e4078 | 482 | unsigned int shnum = this->shnum(); |
c549a694 | 483 | typename File::View v(this->file_->view(this->shoff_, |
501e4078 ILT |
484 | This::shdr_size * shnum)); |
485 | for (unsigned int i = 0; i < shnum; i++) | |
c549a694 ILT |
486 | { |
487 | Ef_shdr shdr(v.data() + This::shdr_size * i); | |
488 | if (shdr.get_sh_type() == type) | |
489 | return i; | |
490 | } | |
491 | return SHN_UNDEF; | |
492 | } | |
493 | ||
645f8123 ILT |
494 | // Return the file offset of the section header of section SHNDX. |
495 | ||
496 | template<int size, bool big_endian, typename File> | |
497 | off_t | |
54674d38 | 498 | Elf_file<size, big_endian, File>::section_header_offset(unsigned int shndx) const |
645f8123 ILT |
499 | { |
500 | if (shndx >= this->shnum()) | |
501 | this->file_->error(_("section_header_offset: bad shndx %u >= %u"), | |
502 | shndx, this->shnum()); | |
503 | return this->shoff_ + This::shdr_size * shndx; | |
504 | } | |
505 | ||
506 | // Return the name of section SHNDX. | |
507 | ||
508 | template<int size, bool big_endian, typename File> | |
509 | std::string | |
54674d38 | 510 | Elf_file<size, big_endian, File>::section_name(unsigned int shndx) const |
645f8123 ILT |
511 | { |
512 | File* const file = this->file_; | |
513 | ||
514 | // Get the section name offset. | |
515 | unsigned int sh_name; | |
516 | { | |
517 | typename File::View v(file->view(this->section_header_offset(shndx), | |
518 | This::shdr_size)); | |
519 | Ef_shdr shdr(v.data()); | |
520 | sh_name = shdr.get_sh_name(); | |
521 | } | |
522 | ||
523 | // Get the file offset for the section name string table data. | |
524 | off_t shstr_off; | |
20e5b5c0 | 525 | typename Elf_types<size>::Elf_WXword shstr_size; |
645f8123 | 526 | { |
501e4078 ILT |
527 | const unsigned int shstrndx = this->shstrndx_; |
528 | typename File::View v(file->view(this->section_header_offset(shstrndx), | |
645f8123 ILT |
529 | This::shdr_size)); |
530 | Ef_shdr shstr_shdr(v.data()); | |
531 | shstr_off = shstr_shdr.get_sh_offset(); | |
532 | shstr_size = shstr_shdr.get_sh_size(); | |
533 | } | |
534 | ||
535 | if (sh_name >= shstr_size) | |
536 | file->error(_("bad section name offset for section %u: %u"), | |
537 | shndx, sh_name); | |
538 | ||
539 | typename File::View v(file->view(shstr_off, shstr_size)); | |
540 | ||
541 | const unsigned char* datau = v.data(); | |
542 | const char* data = reinterpret_cast<const char*>(datau); | |
543 | const void* p = ::memchr(data + sh_name, '\0', shstr_size - sh_name); | |
544 | if (p == NULL) | |
545 | file->error(_("missing null terminator for name of section %u"), | |
546 | shndx); | |
547 | ||
548 | size_t len = static_cast<const char*>(p) - (data + sh_name); | |
549 | ||
550 | return std::string(data + sh_name, len); | |
551 | } | |
552 | ||
553 | // Return the contents of section SHNDX. | |
554 | ||
555 | template<int size, bool big_endian, typename File> | |
556 | typename File::Location | |
557 | Elf_file<size, big_endian, File>::section_contents(unsigned int shndx) | |
558 | { | |
559 | File* const file = this->file_; | |
560 | ||
561 | if (shndx >= this->shnum()) | |
562 | file->error(_("section_contents: bad shndx %u >= %u"), | |
563 | shndx, this->shnum()); | |
564 | ||
565 | typename File::View v(file->view(this->section_header_offset(shndx), | |
566 | This::shdr_size)); | |
567 | Ef_shdr shdr(v.data()); | |
568 | return typename File::Location(shdr.get_sh_offset(), shdr.get_sh_size()); | |
569 | } | |
570 | ||
a445fddf ILT |
571 | // Get the size of section SHNDX. |
572 | ||
573 | template<int size, bool big_endian, typename File> | |
574 | typename Elf_types<size>::Elf_WXword | |
575 | Elf_file<size, big_endian, File>::section_size(unsigned int shndx) | |
576 | { | |
577 | File* const file = this->file_; | |
578 | ||
579 | if (shndx >= this->shnum()) | |
580 | file->error(_("section_size: bad shndx %u >= %u"), | |
581 | shndx, this->shnum()); | |
582 | ||
583 | typename File::View v(file->view(this->section_header_offset(shndx), | |
584 | This::shdr_size)); | |
585 | ||
586 | Ef_shdr shdr(v.data()); | |
587 | return shdr.get_sh_size(); | |
588 | } | |
589 | ||
a3ad94ed ILT |
590 | // Return the section flags of section SHNDX. |
591 | ||
592 | template<int size, bool big_endian, typename File> | |
593 | typename Elf_types<size>::Elf_WXword | |
594 | Elf_file<size, big_endian, File>::section_flags(unsigned int shndx) | |
595 | { | |
596 | File* const file = this->file_; | |
597 | ||
598 | if (shndx >= this->shnum()) | |
599 | file->error(_("section_flags: bad shndx %u >= %u"), | |
600 | shndx, this->shnum()); | |
601 | ||
602 | typename File::View v(file->view(this->section_header_offset(shndx), | |
603 | This::shdr_size)); | |
604 | ||
605 | Ef_shdr shdr(v.data()); | |
606 | return shdr.get_sh_flags(); | |
607 | } | |
608 | ||
88dd47ac ILT |
609 | // Return the address of section SHNDX. |
610 | ||
611 | template<int size, bool big_endian, typename File> | |
612 | typename Elf_types<size>::Elf_Addr | |
613 | Elf_file<size, big_endian, File>::section_addr(unsigned int shndx) | |
614 | { | |
615 | File* const file = this->file_; | |
616 | ||
617 | if (shndx >= this->shnum()) | |
618 | file->error(_("section_flags: bad shndx %u >= %u"), | |
619 | shndx, this->shnum()); | |
620 | ||
621 | typename File::View v(file->view(this->section_header_offset(shndx), | |
622 | This::shdr_size)); | |
623 | ||
624 | Ef_shdr shdr(v.data()); | |
625 | return shdr.get_sh_addr(); | |
626 | } | |
627 | ||
e698bc31 ILT |
628 | // Return the type of section SHNDX. |
629 | ||
630 | template<int size, bool big_endian, typename File> | |
631 | Elf_Word | |
632 | Elf_file<size, big_endian, File>::section_type(unsigned int shndx) | |
633 | { | |
634 | File* const file = this->file_; | |
635 | ||
636 | if (shndx >= this->shnum()) | |
637 | file->error(_("section_type: bad shndx %u >= %u"), | |
638 | shndx, this->shnum()); | |
639 | ||
640 | typename File::View v(file->view(this->section_header_offset(shndx), | |
641 | This::shdr_size)); | |
642 | ||
643 | Ef_shdr shdr(v.data()); | |
644 | return shdr.get_sh_type(); | |
645 | } | |
646 | ||
f7e2ee48 ILT |
647 | // Return the sh_link field of section SHNDX. |
648 | ||
649 | template<int size, bool big_endian, typename File> | |
650 | Elf_Word | |
651 | Elf_file<size, big_endian, File>::section_link(unsigned int shndx) | |
652 | { | |
653 | File* const file = this->file_; | |
654 | ||
655 | if (shndx >= this->shnum()) | |
656 | file->error(_("section_link: bad shndx %u >= %u"), | |
657 | shndx, this->shnum()); | |
658 | ||
659 | typename File::View v(file->view(this->section_header_offset(shndx), | |
660 | This::shdr_size)); | |
661 | ||
662 | Ef_shdr shdr(v.data()); | |
663 | return shdr.get_sh_link(); | |
664 | } | |
665 | ||
f2f3f783 ILT |
666 | // Return the sh_info field of section SHNDX. |
667 | ||
668 | template<int size, bool big_endian, typename File> | |
669 | Elf_Word | |
670 | Elf_file<size, big_endian, File>::section_info(unsigned int shndx) | |
671 | { | |
672 | File* const file = this->file_; | |
673 | ||
674 | if (shndx >= this->shnum()) | |
675 | file->error(_("section_info: bad shndx %u >= %u"), | |
676 | shndx, this->shnum()); | |
677 | ||
678 | typename File::View v(file->view(this->section_header_offset(shndx), | |
679 | This::shdr_size)); | |
680 | ||
681 | Ef_shdr shdr(v.data()); | |
682 | return shdr.get_sh_info(); | |
683 | } | |
684 | ||
a445fddf ILT |
685 | // Return the sh_addralign field of section SHNDX. |
686 | ||
687 | template<int size, bool big_endian, typename File> | |
688 | typename Elf_types<size>::Elf_WXword | |
689 | Elf_file<size, big_endian, File>::section_addralign(unsigned int shndx) | |
690 | { | |
691 | File* const file = this->file_; | |
692 | ||
693 | if (shndx >= this->shnum()) | |
694 | file->error(_("section_addralign: bad shndx %u >= %u"), | |
695 | shndx, this->shnum()); | |
696 | ||
697 | typename File::View v(file->view(this->section_header_offset(shndx), | |
698 | This::shdr_size)); | |
699 | ||
700 | Ef_shdr shdr(v.data()); | |
701 | return shdr.get_sh_addralign(); | |
702 | } | |
703 | ||
c4aa1e2d ILT |
704 | inline |
705 | Elf_strtab::Elf_strtab(const unsigned char* p, size_t size) | |
706 | { | |
707 | // Check if the section is NUL-terminated. If it isn't, we ignore | |
708 | // the last part to make sure we don't return non-NUL-terminated | |
709 | // strings. | |
710 | while (size > 0 && p[size - 1] != 0) | |
711 | size--; | |
712 | this->base_ = reinterpret_cast<const char*>(p); | |
713 | this->usable_size_ = size; | |
714 | } | |
715 | ||
645f8123 ILT |
716 | } // End namespace elfcpp. |
717 | ||
718 | #endif // !defined(ELFCPP_FILE_H) |