1 //===- ELFObjectFile.cpp - ELF object file implementation -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the ELFObjectFile class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/ADT/SmallVector.h"
15 #include "llvm/ADT/StringSwitch.h"
16 #include "llvm/ADT/Triple.h"
17 #include "llvm/ADT/DenseMap.h"
18 #include "llvm/Object/ObjectFile.h"
19 #include "llvm/Support/ELF.h"
20 #include "llvm/Support/Endian.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Support/MemoryBuffer.h"
23 #include "llvm/Support/raw_ostream.h"
29 using namespace object;
31 // Templates to choose Elf_Addr and Elf_Off depending on is64Bits.
33 template<support::endianness target_endianness>
34 struct ELFDataTypeTypedefHelperCommon {
35 typedef support::detail::packed_endian_specific_integral
36 <uint16_t, target_endianness, support::aligned> Elf_Half;
37 typedef support::detail::packed_endian_specific_integral
38 <uint32_t, target_endianness, support::aligned> Elf_Word;
39 typedef support::detail::packed_endian_specific_integral
40 <int32_t, target_endianness, support::aligned> Elf_Sword;
41 typedef support::detail::packed_endian_specific_integral
42 <uint64_t, target_endianness, support::aligned> Elf_Xword;
43 typedef support::detail::packed_endian_specific_integral
44 <int64_t, target_endianness, support::aligned> Elf_Sxword;
49 template<support::endianness target_endianness, bool is64Bits>
50 struct ELFDataTypeTypedefHelper;
53 template<support::endianness target_endianness>
54 struct ELFDataTypeTypedefHelper<target_endianness, false>
55 : ELFDataTypeTypedefHelperCommon<target_endianness> {
56 typedef support::detail::packed_endian_specific_integral
57 <uint32_t, target_endianness, support::aligned> Elf_Addr;
58 typedef support::detail::packed_endian_specific_integral
59 <uint32_t, target_endianness, support::aligned> Elf_Off;
63 template<support::endianness target_endianness>
64 struct ELFDataTypeTypedefHelper<target_endianness, true>
65 : ELFDataTypeTypedefHelperCommon<target_endianness>{
66 typedef support::detail::packed_endian_specific_integral
67 <uint64_t, target_endianness, support::aligned> Elf_Addr;
68 typedef support::detail::packed_endian_specific_integral
69 <uint64_t, target_endianness, support::aligned> Elf_Off;
73 // I really don't like doing this, but the alternative is copypasta.
74 #define LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) \
76 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Addr Elf_Addr; \
78 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Off Elf_Off; \
80 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Half Elf_Half; \
82 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Word Elf_Word; \
84 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sword Elf_Sword; \
86 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Xword Elf_Xword; \
88 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sxword Elf_Sxword;
92 template<support::endianness target_endianness, bool is64Bits>
95 template<support::endianness target_endianness>
96 struct Elf_Shdr_Base<target_endianness, false> {
97 LLVM_ELF_IMPORT_TYPES(target_endianness, false)
98 Elf_Word sh_name; // Section name (index into string table)
99 Elf_Word sh_type; // Section type (SHT_*)
100 Elf_Word sh_flags; // Section flags (SHF_*)
101 Elf_Addr sh_addr; // Address where section is to be loaded
102 Elf_Off sh_offset; // File offset of section data, in bytes
103 Elf_Word sh_size; // Size of section, in bytes
104 Elf_Word sh_link; // Section type-specific header table index link
105 Elf_Word sh_info; // Section type-specific extra information
106 Elf_Word sh_addralign;// Section address alignment
107 Elf_Word sh_entsize; // Size of records contained within the section
110 template<support::endianness target_endianness>
111 struct Elf_Shdr_Base<target_endianness, true> {
112 LLVM_ELF_IMPORT_TYPES(target_endianness, true)
113 Elf_Word sh_name; // Section name (index into string table)
114 Elf_Word sh_type; // Section type (SHT_*)
115 Elf_Xword sh_flags; // Section flags (SHF_*)
116 Elf_Addr sh_addr; // Address where section is to be loaded
117 Elf_Off sh_offset; // File offset of section data, in bytes
118 Elf_Xword sh_size; // Size of section, in bytes
119 Elf_Word sh_link; // Section type-specific header table index link
120 Elf_Word sh_info; // Section type-specific extra information
121 Elf_Xword sh_addralign;// Section address alignment
122 Elf_Xword sh_entsize; // Size of records contained within the section
125 template<support::endianness target_endianness, bool is64Bits>
126 struct Elf_Shdr_Impl : Elf_Shdr_Base<target_endianness, is64Bits> {
127 using Elf_Shdr_Base<target_endianness, is64Bits>::sh_entsize;
128 using Elf_Shdr_Base<target_endianness, is64Bits>::sh_size;
130 /// @brief Get the number of entities this section contains if it has any.
131 unsigned getEntityCount() const {
134 return sh_size / sh_entsize;
140 template<support::endianness target_endianness, bool is64Bits>
143 template<support::endianness target_endianness>
144 struct Elf_Sym_Base<target_endianness, false> {
145 LLVM_ELF_IMPORT_TYPES(target_endianness, false)
146 Elf_Word st_name; // Symbol name (index into string table)
147 Elf_Addr st_value; // Value or address associated with the symbol
148 Elf_Word st_size; // Size of the symbol
149 unsigned char st_info; // Symbol's type and binding attributes
150 unsigned char st_other; // Must be zero; reserved
151 Elf_Half st_shndx; // Which section (header table index) it's defined in
154 template<support::endianness target_endianness>
155 struct Elf_Sym_Base<target_endianness, true> {
156 LLVM_ELF_IMPORT_TYPES(target_endianness, true)
157 Elf_Word st_name; // Symbol name (index into string table)
158 unsigned char st_info; // Symbol's type and binding attributes
159 unsigned char st_other; // Must be zero; reserved
160 Elf_Half st_shndx; // Which section (header table index) it's defined in
161 Elf_Addr st_value; // Value or address associated with the symbol
162 Elf_Xword st_size; // Size of the symbol
165 template<support::endianness target_endianness, bool is64Bits>
166 struct Elf_Sym_Impl : Elf_Sym_Base<target_endianness, is64Bits> {
167 using Elf_Sym_Base<target_endianness, is64Bits>::st_info;
169 // These accessors and mutators correspond to the ELF32_ST_BIND,
170 // ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification:
171 unsigned char getBinding() const { return st_info >> 4; }
172 unsigned char getType() const { return st_info & 0x0f; }
173 void setBinding(unsigned char b) { setBindingAndType(b, getType()); }
174 void setType(unsigned char t) { setBindingAndType(getBinding(), t); }
175 void setBindingAndType(unsigned char b, unsigned char t) {
176 st_info = (b << 4) + (t & 0x0f);
182 template<support::endianness target_endianness, bool is64Bits, bool isRela>
185 template<support::endianness target_endianness>
186 struct Elf_Rel_Base<target_endianness, false, false> {
187 LLVM_ELF_IMPORT_TYPES(target_endianness, false)
188 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr)
189 Elf_Word r_info; // Symbol table index and type of relocation to apply
192 template<support::endianness target_endianness>
193 struct Elf_Rel_Base<target_endianness, true, false> {
194 LLVM_ELF_IMPORT_TYPES(target_endianness, true)
195 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr)
196 Elf_Xword r_info; // Symbol table index and type of relocation to apply
199 template<support::endianness target_endianness>
200 struct Elf_Rel_Base<target_endianness, false, true> {
201 LLVM_ELF_IMPORT_TYPES(target_endianness, false)
202 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr)
203 Elf_Word r_info; // Symbol table index and type of relocation to apply
204 Elf_Sword r_addend; // Compute value for relocatable field by adding this
207 template<support::endianness target_endianness>
208 struct Elf_Rel_Base<target_endianness, true, true> {
209 LLVM_ELF_IMPORT_TYPES(target_endianness, true)
210 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr)
211 Elf_Xword r_info; // Symbol table index and type of relocation to apply
212 Elf_Sxword r_addend; // Compute value for relocatable field by adding this.
215 template<support::endianness target_endianness, bool is64Bits, bool isRela>
218 template<support::endianness target_endianness, bool isRela>
219 struct Elf_Rel_Impl<target_endianness, true, isRela>
220 : Elf_Rel_Base<target_endianness, true, isRela> {
221 using Elf_Rel_Base<target_endianness, true, isRela>::r_info;
222 LLVM_ELF_IMPORT_TYPES(target_endianness, true)
224 // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE,
225 // and ELF64_R_INFO macros defined in the ELF specification:
226 uint64_t getSymbol() const { return (r_info >> 32); }
227 unsigned char getType() const {
228 return (unsigned char) (r_info & 0xffffffffL);
230 void setSymbol(uint64_t s) { setSymbolAndType(s, getType()); }
231 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
232 void setSymbolAndType(uint64_t s, unsigned char t) {
233 r_info = (s << 32) + (t&0xffffffffL);
237 template<support::endianness target_endianness, bool isRela>
238 struct Elf_Rel_Impl<target_endianness, false, isRela>
239 : Elf_Rel_Base<target_endianness, false, isRela> {
240 using Elf_Rel_Base<target_endianness, false, isRela>::r_info;
241 LLVM_ELF_IMPORT_TYPES(target_endianness, false)
243 // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
244 // and ELF32_R_INFO macros defined in the ELF specification:
245 uint32_t getSymbol() const { return (r_info >> 8); }
246 unsigned char getType() const { return (unsigned char) (r_info & 0x0ff); }
247 void setSymbol(uint32_t s) { setSymbolAndType(s, getType()); }
248 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
249 void setSymbolAndType(uint32_t s, unsigned char t) {
250 r_info = (s << 8) + t;
257 template<support::endianness target_endianness, bool is64Bits>
258 class ELFObjectFile : public ObjectFile {
259 LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits)
261 typedef Elf_Shdr_Impl<target_endianness, is64Bits> Elf_Shdr;
262 typedef Elf_Sym_Impl<target_endianness, is64Bits> Elf_Sym;
263 typedef Elf_Rel_Impl<target_endianness, is64Bits, false> Elf_Rel;
264 typedef Elf_Rel_Impl<target_endianness, is64Bits, true> Elf_Rela;
267 unsigned char e_ident[ELF::EI_NIDENT]; // ELF Identification bytes
268 Elf_Half e_type; // Type of file (see ET_*)
269 Elf_Half e_machine; // Required architecture for this file (see EM_*)
270 Elf_Word e_version; // Must be equal to 1
271 Elf_Addr e_entry; // Address to jump to in order to start program
272 Elf_Off e_phoff; // Program header table's file offset, in bytes
273 Elf_Off e_shoff; // Section header table's file offset, in bytes
274 Elf_Word e_flags; // Processor-specific flags
275 Elf_Half e_ehsize; // Size of ELF header, in bytes
276 Elf_Half e_phentsize;// Size of an entry in the program header table
277 Elf_Half e_phnum; // Number of entries in the program header table
278 Elf_Half e_shentsize;// Size of an entry in the section header table
279 Elf_Half e_shnum; // Number of entries in the section header table
280 Elf_Half e_shstrndx; // Section header table index of section name
282 bool checkMagic() const {
283 return (memcmp(e_ident, ELF::ElfMagic, strlen(ELF::ElfMagic))) == 0;
285 unsigned char getFileClass() const { return e_ident[ELF::EI_CLASS]; }
286 unsigned char getDataEncoding() const { return e_ident[ELF::EI_DATA]; }
289 typedef SmallVector<const Elf_Shdr*, 1> Sections_t;
290 typedef DenseMap<unsigned, unsigned> IndexMap_t;
291 typedef DenseMap<const Elf_Shdr*, SmallVector<uint32_t, 1> > RelocMap_t;
293 const Elf_Ehdr *Header;
294 const Elf_Shdr *SectionHeaderTable;
295 const Elf_Shdr *dot_shstrtab_sec; // Section header string table.
296 const Elf_Shdr *dot_strtab_sec; // Symbol header string table.
297 Sections_t SymbolTableSections;
298 IndexMap_t SymbolTableSectionsIndexMap;
299 DenseMap<const Elf_Sym*, ELF::Elf64_Word> ExtendedSymbolTable;
301 /// @brief Map sections to an array of relocation sections that reference
302 /// them sorted by section index.
303 RelocMap_t SectionRelocMap;
305 /// @brief Get the relocation section that contains \a Rel.
306 const Elf_Shdr *getRelSection(DataRefImpl Rel) const {
307 return getSection(Rel.w.b);
310 void validateSymbol(DataRefImpl Symb) const;
311 bool isRelocationHasAddend(DataRefImpl Rel) const;
313 const T *getEntry(uint16_t Section, uint32_t Entry) const;
315 const T *getEntry(const Elf_Shdr *Section, uint32_t Entry) const;
316 const Elf_Sym *getSymbol(DataRefImpl Symb) const;
317 const Elf_Shdr *getSection(DataRefImpl index) const;
318 const Elf_Shdr *getSection(uint32_t index) const;
319 const Elf_Rel *getRel(DataRefImpl Rel) const;
320 const Elf_Rela *getRela(DataRefImpl Rela) const;
321 const char *getString(uint32_t section, uint32_t offset) const;
322 const char *getString(const Elf_Shdr *section, uint32_t offset) const;
323 error_code getSymbolName(const Elf_Sym *Symb, StringRef &Res) const;
326 virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const;
327 virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const;
328 virtual error_code getSymbolOffset(DataRefImpl Symb, uint64_t &Res) const;
329 virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const;
330 virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const;
331 virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const;
332 virtual error_code isSymbolInternal(DataRefImpl Symb, bool &Res) const;
333 virtual error_code isSymbolGlobal(DataRefImpl Symb, bool &Res) const;
334 virtual error_code isSymbolWeak(DataRefImpl Symb, bool &Res) const;
335 virtual error_code getSymbolType(DataRefImpl Symb, SymbolRef::Type &Res) const;
336 virtual error_code isSymbolAbsolute(DataRefImpl Symb, bool &Res) const;
337 virtual error_code getSymbolSection(DataRefImpl Symb,
338 section_iterator &Res) const;
340 virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const;
341 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const;
342 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const;
343 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const;
344 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const;
345 virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const;
346 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const;
347 virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const;
348 virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const;
349 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
351 virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const;
352 virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const;
354 virtual error_code getRelocationNext(DataRefImpl Rel,
355 RelocationRef &Res) const;
356 virtual error_code getRelocationAddress(DataRefImpl Rel,
357 uint64_t &Res) const;
358 virtual error_code getRelocationSymbol(DataRefImpl Rel,
359 SymbolRef &Res) const;
360 virtual error_code getRelocationType(DataRefImpl Rel,
361 uint32_t &Res) const;
362 virtual error_code getRelocationTypeName(DataRefImpl Rel,
363 SmallVectorImpl<char> &Result) const;
364 virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel,
366 virtual error_code getRelocationValueString(DataRefImpl Rel,
367 SmallVectorImpl<char> &Result) const;
370 ELFObjectFile(MemoryBuffer *Object, error_code &ec);
371 virtual symbol_iterator begin_symbols() const;
372 virtual symbol_iterator end_symbols() const;
373 virtual section_iterator begin_sections() const;
374 virtual section_iterator end_sections() const;
376 virtual uint8_t getBytesInAddress() const;
377 virtual StringRef getFileFormatName() const;
378 virtual unsigned getArch() const;
380 uint64_t getNumSections() const;
381 uint64_t getStringTableIndex() const;
382 ELF::Elf64_Word getSymbolTableIndex(const Elf_Sym *symb) const;
383 const Elf_Shdr *getSection(const Elf_Sym *symb) const;
385 static inline bool classof(const Binary *v) {
386 return v->getType() == isELF;
388 static inline bool classof(const ELFObjectFile *v) { return true; }
392 template<support::endianness target_endianness, bool is64Bits>
393 void ELFObjectFile<target_endianness, is64Bits>
394 ::validateSymbol(DataRefImpl Symb) const {
395 const Elf_Sym *symb = getSymbol(Symb);
396 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b];
397 // FIXME: We really need to do proper error handling in the case of an invalid
398 // input file. Because we don't use exceptions, I think we'll just pass
399 // an error object around.
401 && SymbolTableSection
402 && symb >= (const Elf_Sym*)(base()
403 + SymbolTableSection->sh_offset)
404 && symb < (const Elf_Sym*)(base()
405 + SymbolTableSection->sh_offset
406 + SymbolTableSection->sh_size)))
407 // FIXME: Proper error handling.
408 report_fatal_error("Symb must point to a valid symbol!");
411 template<support::endianness target_endianness, bool is64Bits>
412 error_code ELFObjectFile<target_endianness, is64Bits>
413 ::getSymbolNext(DataRefImpl Symb,
414 SymbolRef &Result) const {
415 validateSymbol(Symb);
416 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b];
419 // Check to see if we are at the end of this symbol table.
420 if (Symb.d.a >= SymbolTableSection->getEntityCount()) {
421 // We are at the end. If there are other symbol tables, jump to them.
423 Symb.d.a = 1; // The 0th symbol in ELF is fake.
424 // Otherwise return the terminator.
425 if (Symb.d.b >= SymbolTableSections.size()) {
426 Symb.d.a = std::numeric_limits<uint32_t>::max();
427 Symb.d.b = std::numeric_limits<uint32_t>::max();
431 Result = SymbolRef(Symb, this);
432 return object_error::success;
435 template<support::endianness target_endianness, bool is64Bits>
436 error_code ELFObjectFile<target_endianness, is64Bits>
437 ::getSymbolName(DataRefImpl Symb,
438 StringRef &Result) const {
439 validateSymbol(Symb);
440 const Elf_Sym *symb = getSymbol(Symb);
441 return getSymbolName(symb, Result);
444 template<support::endianness target_endianness, bool is64Bits>
445 ELF::Elf64_Word ELFObjectFile<target_endianness, is64Bits>
446 ::getSymbolTableIndex(const Elf_Sym *symb) const {
447 if (symb->st_shndx == ELF::SHN_XINDEX)
448 return ExtendedSymbolTable.lookup(symb);
449 return symb->st_shndx;
452 template<support::endianness target_endianness, bool is64Bits>
453 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
454 ELFObjectFile<target_endianness, is64Bits>
455 ::getSection(const Elf_Sym *symb) const {
456 if (symb->st_shndx == ELF::SHN_XINDEX)
457 return getSection(ExtendedSymbolTable.lookup(symb));
458 if (symb->st_shndx >= ELF::SHN_LORESERVE)
460 return getSection(symb->st_shndx);
463 template<support::endianness target_endianness, bool is64Bits>
464 error_code ELFObjectFile<target_endianness, is64Bits>
465 ::getSymbolOffset(DataRefImpl Symb,
466 uint64_t &Result) const {
467 validateSymbol(Symb);
468 const Elf_Sym *symb = getSymbol(Symb);
469 const Elf_Shdr *Section;
470 switch (getSymbolTableIndex(symb)) {
471 case ELF::SHN_COMMON:
472 // Undefined symbols have no address yet.
474 Result = UnknownAddressOrSize;
475 return object_error::success;
477 Result = symb->st_value;
478 return object_error::success;
479 default: Section = getSection(symb);
482 switch (symb->getType()) {
483 case ELF::STT_SECTION:
484 Result = Section ? Section->sh_addr : UnknownAddressOrSize;
485 return object_error::success;
487 case ELF::STT_OBJECT:
488 case ELF::STT_NOTYPE:
489 Result = symb->st_value;
490 return object_error::success;
492 Result = UnknownAddressOrSize;
493 return object_error::success;
497 template<support::endianness target_endianness, bool is64Bits>
498 error_code ELFObjectFile<target_endianness, is64Bits>
499 ::getSymbolAddress(DataRefImpl Symb,
500 uint64_t &Result) const {
501 validateSymbol(Symb);
502 const Elf_Sym *symb = getSymbol(Symb);
503 const Elf_Shdr *Section;
504 switch (getSymbolTableIndex(symb)) {
505 case ELF::SHN_COMMON: // Fall through.
506 // Undefined symbols have no address yet.
508 Result = UnknownAddressOrSize;
509 return object_error::success;
511 Result = reinterpret_cast<uintptr_t>(base()+symb->st_value);
512 return object_error::success;
513 default: Section = getSection(symb);
515 const uint8_t* addr = base();
517 addr += Section->sh_offset;
518 switch (symb->getType()) {
519 case ELF::STT_SECTION:
520 Result = reinterpret_cast<uintptr_t>(addr);
521 return object_error::success;
522 case ELF::STT_FUNC: // Fall through.
523 case ELF::STT_OBJECT: // Fall through.
524 case ELF::STT_NOTYPE:
525 addr += symb->st_value;
526 Result = reinterpret_cast<uintptr_t>(addr);
527 return object_error::success;
529 Result = UnknownAddressOrSize;
530 return object_error::success;
534 template<support::endianness target_endianness, bool is64Bits>
535 error_code ELFObjectFile<target_endianness, is64Bits>
536 ::getSymbolSize(DataRefImpl Symb,
537 uint64_t &Result) const {
538 validateSymbol(Symb);
539 const Elf_Sym *symb = getSymbol(Symb);
540 if (symb->st_size == 0)
541 Result = UnknownAddressOrSize;
542 Result = symb->st_size;
543 return object_error::success;
546 template<support::endianness target_endianness, bool is64Bits>
547 error_code ELFObjectFile<target_endianness, is64Bits>
548 ::getSymbolNMTypeChar(DataRefImpl Symb,
549 char &Result) const {
550 validateSymbol(Symb);
551 const Elf_Sym *symb = getSymbol(Symb);
552 const Elf_Shdr *Section = getSection(symb);
557 switch (Section->sh_type) {
558 case ELF::SHT_PROGBITS:
559 case ELF::SHT_DYNAMIC:
560 switch (Section->sh_flags) {
561 case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR):
563 case (ELF::SHF_ALLOC | ELF::SHF_WRITE):
566 case (ELF::SHF_ALLOC | ELF::SHF_MERGE):
567 case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS):
571 case ELF::SHT_NOBITS: ret = 'b';
575 switch (getSymbolTableIndex(symb)) {
580 case ELF::SHN_ABS: ret = 'a'; break;
581 case ELF::SHN_COMMON: ret = 'c'; break;
584 switch (symb->getBinding()) {
585 case ELF::STB_GLOBAL: ret = ::toupper(ret); break;
587 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF)
590 if (symb->getType() == ELF::STT_OBJECT)
596 if (ret == '?' && symb->getType() == ELF::STT_SECTION) {
598 if (error_code ec = getSymbolName(Symb, name))
600 Result = StringSwitch<char>(name)
601 .StartsWith(".debug", 'N')
602 .StartsWith(".note", 'n')
604 return object_error::success;
608 return object_error::success;
611 template<support::endianness target_endianness, bool is64Bits>
612 error_code ELFObjectFile<target_endianness, is64Bits>
613 ::getSymbolType(DataRefImpl Symb,
614 SymbolRef::Type &Result) const {
615 validateSymbol(Symb);
616 const Elf_Sym *symb = getSymbol(Symb);
618 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) {
619 Result = SymbolRef::ST_External;
620 return object_error::success;
623 switch (symb->getType()) {
624 case ELF::STT_SECTION:
625 Result = SymbolRef::ST_Debug;
628 Result = SymbolRef::ST_File;
631 Result = SymbolRef::ST_Function;
633 case ELF::STT_OBJECT:
634 Result = SymbolRef::ST_Data;
637 Result = SymbolRef::ST_Other;
640 return object_error::success;
643 template<support::endianness target_endianness, bool is64Bits>
644 error_code ELFObjectFile<target_endianness, is64Bits>
645 ::isSymbolGlobal(DataRefImpl Symb,
646 bool &Result) const {
647 validateSymbol(Symb);
648 const Elf_Sym *symb = getSymbol(Symb);
650 Result = symb->getBinding() == ELF::STB_GLOBAL;
651 return object_error::success;
654 template<support::endianness target_endianness, bool is64Bits>
655 error_code ELFObjectFile<target_endianness, is64Bits>
656 ::isSymbolWeak(DataRefImpl Symb,
657 bool &Result) const {
658 validateSymbol(Symb);
659 const Elf_Sym *symb = getSymbol(Symb);
661 Result = symb->getBinding() == ELF::STB_WEAK;
662 return object_error::success;
665 template<support::endianness target_endianness, bool is64Bits>
666 error_code ELFObjectFile<target_endianness, is64Bits>
667 ::isSymbolAbsolute(DataRefImpl Symb, bool &Res) const {
668 validateSymbol(Symb);
669 const Elf_Sym *symb = getSymbol(Symb);
670 Res = symb->st_shndx == ELF::SHN_ABS;
671 return object_error::success;
674 template<support::endianness target_endianness, bool is64Bits>
675 error_code ELFObjectFile<target_endianness, is64Bits>
676 ::getSymbolSection(DataRefImpl Symb,
677 section_iterator &Res) const {
678 validateSymbol(Symb);
679 const Elf_Sym *symb = getSymbol(Symb);
680 const Elf_Shdr *sec = getSection(symb);
682 Res = end_sections();
685 Sec.p = reinterpret_cast<intptr_t>(sec);
686 Res = section_iterator(SectionRef(Sec, this));
688 return object_error::success;
691 template<support::endianness target_endianness, bool is64Bits>
692 error_code ELFObjectFile<target_endianness, is64Bits>
693 ::isSymbolInternal(DataRefImpl Symb,
694 bool &Result) const {
695 validateSymbol(Symb);
696 const Elf_Sym *symb = getSymbol(Symb);
698 if ( symb->getType() == ELF::STT_FILE
699 || symb->getType() == ELF::STT_SECTION)
702 return object_error::success;
705 template<support::endianness target_endianness, bool is64Bits>
706 error_code ELFObjectFile<target_endianness, is64Bits>
707 ::getSectionNext(DataRefImpl Sec, SectionRef &Result) const {
708 const uint8_t *sec = reinterpret_cast<const uint8_t *>(Sec.p);
709 sec += Header->e_shentsize;
710 Sec.p = reinterpret_cast<intptr_t>(sec);
711 Result = SectionRef(Sec, this);
712 return object_error::success;
715 template<support::endianness target_endianness, bool is64Bits>
716 error_code ELFObjectFile<target_endianness, is64Bits>
717 ::getSectionName(DataRefImpl Sec,
718 StringRef &Result) const {
719 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
720 Result = StringRef(getString(dot_shstrtab_sec, sec->sh_name));
721 return object_error::success;
724 template<support::endianness target_endianness, bool is64Bits>
725 error_code ELFObjectFile<target_endianness, is64Bits>
726 ::getSectionAddress(DataRefImpl Sec,
727 uint64_t &Result) const {
728 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
729 Result = sec->sh_addr;
730 return object_error::success;
733 template<support::endianness target_endianness, bool is64Bits>
734 error_code ELFObjectFile<target_endianness, is64Bits>
735 ::getSectionSize(DataRefImpl Sec,
736 uint64_t &Result) const {
737 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
738 Result = sec->sh_size;
739 return object_error::success;
742 template<support::endianness target_endianness, bool is64Bits>
743 error_code ELFObjectFile<target_endianness, is64Bits>
744 ::getSectionContents(DataRefImpl Sec,
745 StringRef &Result) const {
746 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
747 const char *start = (const char*)base() + sec->sh_offset;
748 Result = StringRef(start, sec->sh_size);
749 return object_error::success;
752 template<support::endianness target_endianness, bool is64Bits>
753 error_code ELFObjectFile<target_endianness, is64Bits>
754 ::getSectionAlignment(DataRefImpl Sec,
755 uint64_t &Result) const {
756 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
757 Result = sec->sh_addralign;
758 return object_error::success;
761 template<support::endianness target_endianness, bool is64Bits>
762 error_code ELFObjectFile<target_endianness, is64Bits>
763 ::isSectionText(DataRefImpl Sec,
764 bool &Result) const {
765 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
766 if (sec->sh_flags & ELF::SHF_EXECINSTR)
770 return object_error::success;
773 template<support::endianness target_endianness, bool is64Bits>
774 error_code ELFObjectFile<target_endianness, is64Bits>
775 ::isSectionData(DataRefImpl Sec,
776 bool &Result) const {
777 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
778 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE)
779 && sec->sh_type == ELF::SHT_PROGBITS)
783 return object_error::success;
786 template<support::endianness target_endianness, bool is64Bits>
787 error_code ELFObjectFile<target_endianness, is64Bits>
788 ::isSectionBSS(DataRefImpl Sec,
789 bool &Result) const {
790 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
791 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE)
792 && sec->sh_type == ELF::SHT_NOBITS)
796 return object_error::success;
799 template<support::endianness target_endianness, bool is64Bits>
800 error_code ELFObjectFile<target_endianness, is64Bits>
801 ::sectionContainsSymbol(DataRefImpl Sec,
803 bool &Result) const {
804 // FIXME: Unimplemented.
806 return object_error::success;
809 template<support::endianness target_endianness, bool is64Bits>
810 relocation_iterator ELFObjectFile<target_endianness, is64Bits>
811 ::getSectionRelBegin(DataRefImpl Sec) const {
813 memset(&RelData, 0, sizeof(RelData));
814 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
815 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec);
816 if (sec != 0 && ittr != SectionRelocMap.end()) {
817 RelData.w.a = getSection(ittr->second[0])->sh_info;
818 RelData.w.b = ittr->second[0];
821 return relocation_iterator(RelocationRef(RelData, this));
824 template<support::endianness target_endianness, bool is64Bits>
825 relocation_iterator ELFObjectFile<target_endianness, is64Bits>
826 ::getSectionRelEnd(DataRefImpl Sec) const {
828 memset(&RelData, 0, sizeof(RelData));
829 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
830 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec);
831 if (sec != 0 && ittr != SectionRelocMap.end()) {
832 // Get the index of the last relocation section for this section.
833 std::size_t relocsecindex = ittr->second[ittr->second.size() - 1];
834 const Elf_Shdr *relocsec = getSection(relocsecindex);
835 RelData.w.a = relocsec->sh_info;
836 RelData.w.b = relocsecindex;
837 RelData.w.c = relocsec->sh_size / relocsec->sh_entsize;
839 return relocation_iterator(RelocationRef(RelData, this));
843 template<support::endianness target_endianness, bool is64Bits>
844 error_code ELFObjectFile<target_endianness, is64Bits>
845 ::getRelocationNext(DataRefImpl Rel,
846 RelocationRef &Result) const {
848 const Elf_Shdr *relocsec = getSection(Rel.w.b);
849 if (Rel.w.c >= (relocsec->sh_size / relocsec->sh_entsize)) {
850 // We have reached the end of the relocations for this section. See if there
851 // is another relocation section.
852 typename RelocMap_t::mapped_type relocseclist =
853 SectionRelocMap.lookup(getSection(Rel.w.a));
855 // Do a binary search for the current reloc section index (which must be
856 // present). Then get the next one.
857 typename RelocMap_t::mapped_type::const_iterator loc =
858 std::lower_bound(relocseclist.begin(), relocseclist.end(), Rel.w.b);
861 // If there is no next one, don't do anything. The ++Rel.w.c above sets Rel
862 // to the end iterator.
863 if (loc != relocseclist.end()) {
868 Result = RelocationRef(Rel, this);
869 return object_error::success;
872 template<support::endianness target_endianness, bool is64Bits>
873 error_code ELFObjectFile<target_endianness, is64Bits>
874 ::getRelocationSymbol(DataRefImpl Rel,
875 SymbolRef &Result) const {
877 const Elf_Shdr *sec = getSection(Rel.w.b);
878 switch (sec->sh_type) {
880 report_fatal_error("Invalid section type in Rel!");
881 case ELF::SHT_REL : {
882 symbolIdx = getRel(Rel)->getSymbol();
885 case ELF::SHT_RELA : {
886 symbolIdx = getRela(Rel)->getSymbol();
890 DataRefImpl SymbolData;
891 IndexMap_t::const_iterator it = SymbolTableSectionsIndexMap.find(sec->sh_link);
892 if (it == SymbolTableSectionsIndexMap.end())
893 report_fatal_error("Relocation symbol table not found!");
894 SymbolData.d.a = symbolIdx;
895 SymbolData.d.b = it->second;
896 Result = SymbolRef(SymbolData, this);
897 return object_error::success;
900 template<support::endianness target_endianness, bool is64Bits>
901 error_code ELFObjectFile<target_endianness, is64Bits>
902 ::getRelocationAddress(DataRefImpl Rel,
903 uint64_t &Result) const {
905 const Elf_Shdr *sec = getSection(Rel.w.b);
906 switch (sec->sh_type) {
908 report_fatal_error("Invalid section type in Rel!");
909 case ELF::SHT_REL : {
910 offset = getRel(Rel)->r_offset;
913 case ELF::SHT_RELA : {
914 offset = getRela(Rel)->r_offset;
920 return object_error::success;
923 template<support::endianness target_endianness, bool is64Bits>
924 error_code ELFObjectFile<target_endianness, is64Bits>
925 ::getRelocationType(DataRefImpl Rel,
926 uint32_t &Result) const {
927 const Elf_Shdr *sec = getSection(Rel.w.b);
928 switch (sec->sh_type) {
930 report_fatal_error("Invalid section type in Rel!");
931 case ELF::SHT_REL : {
932 Result = getRel(Rel)->getType();
935 case ELF::SHT_RELA : {
936 Result = getRela(Rel)->getType();
940 return object_error::success;
943 #define LLVM_ELF_SWITCH_RELOC_TYPE_NAME(enum) \
944 case ELF::enum: res = #enum; break;
946 template<support::endianness target_endianness, bool is64Bits>
947 error_code ELFObjectFile<target_endianness, is64Bits>
948 ::getRelocationTypeName(DataRefImpl Rel,
949 SmallVectorImpl<char> &Result) const {
950 const Elf_Shdr *sec = getSection(Rel.w.b);
953 switch (sec->sh_type) {
955 return object_error::parse_failed;
956 case ELF::SHT_REL : {
957 type = getRel(Rel)->getType();
960 case ELF::SHT_RELA : {
961 type = getRela(Rel)->getType();
965 switch (Header->e_machine) {
968 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_NONE);
969 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_64);
970 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC32);
971 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOT32);
972 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PLT32);
973 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_COPY);
974 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GLOB_DAT);
975 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_JUMP_SLOT);
976 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_RELATIVE);
977 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPCREL);
978 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32);
979 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32S);
980 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_16);
981 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC16);
982 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_8);
983 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC8);
984 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPMOD64);
985 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF64);
986 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF64);
987 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSGD);
988 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSLD);
989 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF32);
990 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTTPOFF);
991 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF32);
992 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC64);
993 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTOFF64);
994 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32);
995 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE32);
996 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE64);
997 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32_TLSDESC);
998 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC_CALL);
999 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC);
1006 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_NONE);
1007 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32);
1008 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC32);
1009 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOT32);
1010 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PLT32);
1011 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_COPY);
1012 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GLOB_DAT);
1013 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_JUMP_SLOT);
1014 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_RELATIVE);
1015 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTOFF);
1016 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTPC);
1017 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32PLT);
1018 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF);
1019 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE);
1020 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTIE);
1021 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE);
1022 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD);
1023 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM);
1024 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_16);
1025 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC16);
1026 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_8);
1027 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC8);
1028 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_32);
1029 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_PUSH);
1030 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_CALL);
1031 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_POP);
1032 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_32);
1033 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_PUSH);
1034 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_CALL);
1035 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_POP);
1036 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDO_32);
1037 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE_32);
1038 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE_32);
1039 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPMOD32);
1040 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPOFF32);
1041 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF32);
1042 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTDESC);
1043 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC_CALL);
1044 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC);
1045 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_IRELATIVE);
1053 Result.append(res.begin(), res.end());
1054 return object_error::success;
1057 #undef LLVM_ELF_SWITCH_RELOC_TYPE_NAME
1059 template<support::endianness target_endianness, bool is64Bits>
1060 error_code ELFObjectFile<target_endianness, is64Bits>
1061 ::getRelocationAdditionalInfo(DataRefImpl Rel,
1062 int64_t &Result) const {
1063 const Elf_Shdr *sec = getSection(Rel.w.b);
1064 switch (sec->sh_type) {
1066 report_fatal_error("Invalid section type in Rel!");
1067 case ELF::SHT_REL : {
1069 return object_error::success;
1071 case ELF::SHT_RELA : {
1072 Result = getRela(Rel)->r_addend;
1073 return object_error::success;
1078 template<support::endianness target_endianness, bool is64Bits>
1079 error_code ELFObjectFile<target_endianness, is64Bits>
1080 ::getRelocationValueString(DataRefImpl Rel,
1081 SmallVectorImpl<char> &Result) const {
1082 const Elf_Shdr *sec = getSection(Rel.w.b);
1086 uint16_t symbol_index = 0;
1087 switch (sec->sh_type) {
1089 return object_error::parse_failed;
1090 case ELF::SHT_REL : {
1091 type = getRel(Rel)->getType();
1092 symbol_index = getRel(Rel)->getSymbol();
1093 // TODO: Read implicit addend from section data.
1096 case ELF::SHT_RELA : {
1097 type = getRela(Rel)->getType();
1098 symbol_index = getRela(Rel)->getSymbol();
1099 addend = getRela(Rel)->r_addend;
1103 const Elf_Sym *symb = getEntry<Elf_Sym>(sec->sh_link, symbol_index);
1105 if (error_code ec = getSymbolName(symb, symname))
1107 switch (Header->e_machine) {
1108 case ELF::EM_X86_64:
1110 case ELF::R_X86_64_32S:
1113 case ELF::R_X86_64_PC32: {
1115 raw_string_ostream fmt(fmtbuf);
1116 fmt << symname << (addend < 0 ? "" : "+") << addend << "-P";
1118 Result.append(fmtbuf.begin(), fmtbuf.end());
1129 Result.append(res.begin(), res.end());
1130 return object_error::success;
1133 template<support::endianness target_endianness, bool is64Bits>
1134 ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object
1136 : ObjectFile(Binary::isELF, Object, ec)
1137 , SectionHeaderTable(0)
1138 , dot_shstrtab_sec(0)
1139 , dot_strtab_sec(0) {
1140 Header = reinterpret_cast<const Elf_Ehdr *>(base());
1142 if (Header->e_shoff == 0)
1145 SectionHeaderTable =
1146 reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff);
1147 uint64_t SectionTableSize = getNumSections() * Header->e_shentsize;
1148 if (!( (const uint8_t *)SectionHeaderTable + SectionTableSize
1149 <= base() + Data->getBufferSize()))
1150 // FIXME: Proper error handling.
1151 report_fatal_error("Section table goes past end of file!");
1154 // To find the symbol tables we walk the section table to find SHT_SYMTAB.
1155 const Elf_Shdr* SymbolTableSectionHeaderIndex = 0;
1156 const Elf_Shdr* sh = reinterpret_cast<const Elf_Shdr*>(SectionHeaderTable);
1157 for (uint64_t i = 0, e = getNumSections(); i != e; ++i) {
1158 if (sh->sh_type == ELF::SHT_SYMTAB_SHNDX) {
1159 if (SymbolTableSectionHeaderIndex)
1160 // FIXME: Proper error handling.
1161 report_fatal_error("More than one .symtab_shndx!");
1162 SymbolTableSectionHeaderIndex = sh;
1164 if (sh->sh_type == ELF::SHT_SYMTAB) {
1165 SymbolTableSectionsIndexMap[i] = SymbolTableSections.size();
1166 SymbolTableSections.push_back(sh);
1168 if (sh->sh_type == ELF::SHT_REL || sh->sh_type == ELF::SHT_RELA) {
1169 SectionRelocMap[getSection(sh->sh_info)].push_back(i);
1174 // Sort section relocation lists by index.
1175 for (typename RelocMap_t::iterator i = SectionRelocMap.begin(),
1176 e = SectionRelocMap.end(); i != e; ++i) {
1177 std::sort(i->second.begin(), i->second.end());
1180 // Get string table sections.
1181 dot_shstrtab_sec = getSection(getStringTableIndex());
1182 if (dot_shstrtab_sec) {
1183 // Verify that the last byte in the string table in a null.
1184 if (((const char*)base() + dot_shstrtab_sec->sh_offset)
1185 [dot_shstrtab_sec->sh_size - 1] != 0)
1186 // FIXME: Proper error handling.
1187 report_fatal_error("String table must end with a null terminator!");
1190 // Merge this into the above loop.
1191 for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable),
1192 *e = i + getNumSections() * Header->e_shentsize;
1193 i != e; i += Header->e_shentsize) {
1194 const Elf_Shdr *sh = reinterpret_cast<const Elf_Shdr*>(i);
1195 if (sh->sh_type == ELF::SHT_STRTAB) {
1196 StringRef SectionName(getString(dot_shstrtab_sec, sh->sh_name));
1197 if (SectionName == ".strtab") {
1198 if (dot_strtab_sec != 0)
1199 // FIXME: Proper error handling.
1200 report_fatal_error("Already found section named .strtab!");
1201 dot_strtab_sec = sh;
1202 const char *dot_strtab = (const char*)base() + sh->sh_offset;
1203 if (dot_strtab[sh->sh_size - 1] != 0)
1204 // FIXME: Proper error handling.
1205 report_fatal_error("String table must end with a null terminator!");
1210 // Build symbol name side-mapping if there is one.
1211 if (SymbolTableSectionHeaderIndex) {
1212 const Elf_Word *ShndxTable = reinterpret_cast<const Elf_Word*>(base() +
1213 SymbolTableSectionHeaderIndex->sh_offset);
1215 for (symbol_iterator si = begin_symbols(),
1216 se = end_symbols(); si != se; si.increment(ec)) {
1218 report_fatal_error("Fewer extended symbol table entries than symbols!");
1219 if (*ShndxTable != ELF::SHN_UNDEF)
1220 ExtendedSymbolTable[getSymbol(si->getRawDataRefImpl())] = *ShndxTable;
1226 template<support::endianness target_endianness, bool is64Bits>
1227 symbol_iterator ELFObjectFile<target_endianness, is64Bits>
1228 ::begin_symbols() const {
1229 DataRefImpl SymbolData;
1230 memset(&SymbolData, 0, sizeof(SymbolData));
1231 if (SymbolTableSections.size() == 0) {
1232 SymbolData.d.a = std::numeric_limits<uint32_t>::max();
1233 SymbolData.d.b = std::numeric_limits<uint32_t>::max();
1235 SymbolData.d.a = 1; // The 0th symbol in ELF is fake.
1238 return symbol_iterator(SymbolRef(SymbolData, this));
1241 template<support::endianness target_endianness, bool is64Bits>
1242 symbol_iterator ELFObjectFile<target_endianness, is64Bits>
1243 ::end_symbols() const {
1244 DataRefImpl SymbolData;
1245 memset(&SymbolData, 0, sizeof(SymbolData));
1246 SymbolData.d.a = std::numeric_limits<uint32_t>::max();
1247 SymbolData.d.b = std::numeric_limits<uint32_t>::max();
1248 return symbol_iterator(SymbolRef(SymbolData, this));
1251 template<support::endianness target_endianness, bool is64Bits>
1252 section_iterator ELFObjectFile<target_endianness, is64Bits>
1253 ::begin_sections() const {
1255 memset(&ret, 0, sizeof(DataRefImpl));
1256 ret.p = reinterpret_cast<intptr_t>(base() + Header->e_shoff);
1257 return section_iterator(SectionRef(ret, this));
1260 template<support::endianness target_endianness, bool is64Bits>
1261 section_iterator ELFObjectFile<target_endianness, is64Bits>
1262 ::end_sections() const {
1264 memset(&ret, 0, sizeof(DataRefImpl));
1265 ret.p = reinterpret_cast<intptr_t>(base()
1267 + (Header->e_shentsize*getNumSections()));
1268 return section_iterator(SectionRef(ret, this));
1271 template<support::endianness target_endianness, bool is64Bits>
1272 uint8_t ELFObjectFile<target_endianness, is64Bits>::getBytesInAddress() const {
1273 return is64Bits ? 8 : 4;
1276 template<support::endianness target_endianness, bool is64Bits>
1277 StringRef ELFObjectFile<target_endianness, is64Bits>
1278 ::getFileFormatName() const {
1279 switch(Header->e_ident[ELF::EI_CLASS]) {
1280 case ELF::ELFCLASS32:
1281 switch(Header->e_machine) {
1283 return "ELF32-i386";
1284 case ELF::EM_X86_64:
1285 return "ELF32-x86-64";
1289 return "ELF32-unknown";
1291 case ELF::ELFCLASS64:
1292 switch(Header->e_machine) {
1294 return "ELF64-i386";
1295 case ELF::EM_X86_64:
1296 return "ELF64-x86-64";
1298 return "ELF64-unknown";
1301 // FIXME: Proper error handling.
1302 report_fatal_error("Invalid ELFCLASS!");
1306 template<support::endianness target_endianness, bool is64Bits>
1307 unsigned ELFObjectFile<target_endianness, is64Bits>::getArch() const {
1308 switch(Header->e_machine) {
1311 case ELF::EM_X86_64:
1312 return Triple::x86_64;
1316 return Triple::UnknownArch;
1320 template<support::endianness target_endianness, bool is64Bits>
1321 uint64_t ELFObjectFile<target_endianness, is64Bits>::getNumSections() const {
1322 if (Header->e_shnum == ELF::SHN_UNDEF)
1323 return SectionHeaderTable->sh_size;
1324 return Header->e_shnum;
1327 template<support::endianness target_endianness, bool is64Bits>
1329 ELFObjectFile<target_endianness, is64Bits>::getStringTableIndex() const {
1330 if (Header->e_shnum == ELF::SHN_UNDEF) {
1331 if (Header->e_shstrndx == ELF::SHN_HIRESERVE)
1332 return SectionHeaderTable->sh_link;
1333 if (Header->e_shstrndx >= getNumSections())
1336 return Header->e_shstrndx;
1340 template<support::endianness target_endianness, bool is64Bits>
1341 template<typename T>
1343 ELFObjectFile<target_endianness, is64Bits>::getEntry(uint16_t Section,
1344 uint32_t Entry) const {
1345 return getEntry<T>(getSection(Section), Entry);
1348 template<support::endianness target_endianness, bool is64Bits>
1349 template<typename T>
1351 ELFObjectFile<target_endianness, is64Bits>::getEntry(const Elf_Shdr * Section,
1352 uint32_t Entry) const {
1353 return reinterpret_cast<const T *>(
1355 + Section->sh_offset
1356 + (Entry * Section->sh_entsize));
1359 template<support::endianness target_endianness, bool is64Bits>
1360 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Sym *
1361 ELFObjectFile<target_endianness, is64Bits>::getSymbol(DataRefImpl Symb) const {
1362 return getEntry<Elf_Sym>(SymbolTableSections[Symb.d.b], Symb.d.a);
1365 template<support::endianness target_endianness, bool is64Bits>
1366 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rel *
1367 ELFObjectFile<target_endianness, is64Bits>::getRel(DataRefImpl Rel) const {
1368 return getEntry<Elf_Rel>(Rel.w.b, Rel.w.c);
1371 template<support::endianness target_endianness, bool is64Bits>
1372 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rela *
1373 ELFObjectFile<target_endianness, is64Bits>::getRela(DataRefImpl Rela) const {
1374 return getEntry<Elf_Rela>(Rela.w.b, Rela.w.c);
1377 template<support::endianness target_endianness, bool is64Bits>
1378 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
1379 ELFObjectFile<target_endianness, is64Bits>::getSection(DataRefImpl Symb) const {
1380 const Elf_Shdr *sec = getSection(Symb.d.b);
1381 if (sec->sh_type != ELF::SHT_SYMTAB || sec->sh_type != ELF::SHT_DYNSYM)
1382 // FIXME: Proper error handling.
1383 report_fatal_error("Invalid symbol table section!");
1387 template<support::endianness target_endianness, bool is64Bits>
1388 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
1389 ELFObjectFile<target_endianness, is64Bits>::getSection(uint32_t index) const {
1392 if (!SectionHeaderTable || index >= getNumSections())
1393 // FIXME: Proper error handling.
1394 report_fatal_error("Invalid section index!");
1396 return reinterpret_cast<const Elf_Shdr *>(
1397 reinterpret_cast<const char *>(SectionHeaderTable)
1398 + (index * Header->e_shentsize));
1401 template<support::endianness target_endianness, bool is64Bits>
1402 const char *ELFObjectFile<target_endianness, is64Bits>
1403 ::getString(uint32_t section,
1404 ELF::Elf32_Word offset) const {
1405 return getString(getSection(section), offset);
1408 template<support::endianness target_endianness, bool is64Bits>
1409 const char *ELFObjectFile<target_endianness, is64Bits>
1410 ::getString(const Elf_Shdr *section,
1411 ELF::Elf32_Word offset) const {
1412 assert(section && section->sh_type == ELF::SHT_STRTAB && "Invalid section!");
1413 if (offset >= section->sh_size)
1414 // FIXME: Proper error handling.
1415 report_fatal_error("Symbol name offset outside of string table!");
1416 return (const char *)base() + section->sh_offset + offset;
1419 template<support::endianness target_endianness, bool is64Bits>
1420 error_code ELFObjectFile<target_endianness, is64Bits>
1421 ::getSymbolName(const Elf_Sym *symb,
1422 StringRef &Result) const {
1423 if (symb->st_name == 0) {
1424 const Elf_Shdr *section = getSection(symb);
1428 Result = getString(dot_shstrtab_sec, section->sh_name);
1429 return object_error::success;
1432 // Use the default symbol table name section.
1433 Result = getString(dot_strtab_sec, symb->st_name);
1434 return object_error::success;
1437 // EI_CLASS, EI_DATA.
1438 static std::pair<unsigned char, unsigned char>
1439 getElfArchType(MemoryBuffer *Object) {
1440 if (Object->getBufferSize() < ELF::EI_NIDENT)
1441 return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE);
1442 return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS]
1443 , (uint8_t)Object->getBufferStart()[ELF::EI_DATA]);
1448 ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) {
1449 std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object);
1451 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
1452 return new ELFObjectFile<support::little, false>(Object, ec);
1453 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
1454 return new ELFObjectFile<support::big, false>(Object, ec);
1455 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB)
1456 return new ELFObjectFile<support::little, true>(Object, ec);
1457 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
1458 return new ELFObjectFile<support::big, true>(Object, ec);
1459 // FIXME: Proper error handling.
1460 report_fatal_error("Not an ELF object file!");
1463 } // end namespace llvm