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;
337 virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const;
338 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const;
339 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const;
340 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const;
341 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const;
342 virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const;
343 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const;
344 virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const;
345 virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const;
346 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
348 virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const;
349 virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const;
351 virtual error_code getRelocationNext(DataRefImpl Rel,
352 RelocationRef &Res) const;
353 virtual error_code getRelocationAddress(DataRefImpl Rel,
354 uint64_t &Res) const;
355 virtual error_code getRelocationSymbol(DataRefImpl Rel,
356 SymbolRef &Res) const;
357 virtual error_code getRelocationType(DataRefImpl Rel,
358 uint32_t &Res) const;
359 virtual error_code getRelocationTypeName(DataRefImpl Rel,
360 SmallVectorImpl<char> &Result) const;
361 virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel,
363 virtual error_code getRelocationValueString(DataRefImpl Rel,
364 SmallVectorImpl<char> &Result) const;
367 ELFObjectFile(MemoryBuffer *Object, error_code &ec);
368 virtual symbol_iterator begin_symbols() const;
369 virtual symbol_iterator end_symbols() const;
370 virtual section_iterator begin_sections() const;
371 virtual section_iterator end_sections() const;
373 virtual uint8_t getBytesInAddress() const;
374 virtual StringRef getFileFormatName() const;
375 virtual unsigned getArch() const;
377 uint64_t getNumSections() const;
378 uint64_t getStringTableIndex() const;
379 ELF::Elf64_Word getSymbolTableIndex(const Elf_Sym *symb) const;
380 const Elf_Shdr *getSection(const Elf_Sym *symb) const;
382 static inline bool classof(const Binary *v) {
383 return v->getType() == isELF;
385 static inline bool classof(const ELFObjectFile *v) { return true; }
389 template<support::endianness target_endianness, bool is64Bits>
390 void ELFObjectFile<target_endianness, is64Bits>
391 ::validateSymbol(DataRefImpl Symb) const {
392 const Elf_Sym *symb = getSymbol(Symb);
393 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b];
394 // FIXME: We really need to do proper error handling in the case of an invalid
395 // input file. Because we don't use exceptions, I think we'll just pass
396 // an error object around.
398 && SymbolTableSection
399 && symb >= (const Elf_Sym*)(base()
400 + SymbolTableSection->sh_offset)
401 && symb < (const Elf_Sym*)(base()
402 + SymbolTableSection->sh_offset
403 + SymbolTableSection->sh_size)))
404 // FIXME: Proper error handling.
405 report_fatal_error("Symb must point to a valid symbol!");
408 template<support::endianness target_endianness, bool is64Bits>
409 error_code ELFObjectFile<target_endianness, is64Bits>
410 ::getSymbolNext(DataRefImpl Symb,
411 SymbolRef &Result) const {
412 validateSymbol(Symb);
413 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b];
416 // Check to see if we are at the end of this symbol table.
417 if (Symb.d.a >= SymbolTableSection->getEntityCount()) {
418 // We are at the end. If there are other symbol tables, jump to them.
420 Symb.d.a = 1; // The 0th symbol in ELF is fake.
421 // Otherwise return the terminator.
422 if (Symb.d.b >= SymbolTableSections.size()) {
423 Symb.d.a = std::numeric_limits<uint32_t>::max();
424 Symb.d.b = std::numeric_limits<uint32_t>::max();
428 Result = SymbolRef(Symb, this);
429 return object_error::success;
432 template<support::endianness target_endianness, bool is64Bits>
433 error_code ELFObjectFile<target_endianness, is64Bits>
434 ::getSymbolName(DataRefImpl Symb,
435 StringRef &Result) const {
436 validateSymbol(Symb);
437 const Elf_Sym *symb = getSymbol(Symb);
438 return getSymbolName(symb, Result);
441 template<support::endianness target_endianness, bool is64Bits>
442 ELF::Elf64_Word ELFObjectFile<target_endianness, is64Bits>
443 ::getSymbolTableIndex(const Elf_Sym *symb) const {
444 if (symb->st_shndx == ELF::SHN_XINDEX)
445 return ExtendedSymbolTable.lookup(symb);
446 return symb->st_shndx;
449 template<support::endianness target_endianness, bool is64Bits>
450 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
451 ELFObjectFile<target_endianness, is64Bits>
452 ::getSection(const Elf_Sym *symb) const {
453 if (symb->st_shndx == ELF::SHN_XINDEX)
454 return getSection(ExtendedSymbolTable.lookup(symb));
455 if (symb->st_shndx >= ELF::SHN_LORESERVE)
457 return getSection(symb->st_shndx);
460 template<support::endianness target_endianness, bool is64Bits>
461 error_code ELFObjectFile<target_endianness, is64Bits>
462 ::getSymbolOffset(DataRefImpl Symb,
463 uint64_t &Result) const {
464 validateSymbol(Symb);
465 const Elf_Sym *symb = getSymbol(Symb);
466 const Elf_Shdr *Section;
467 switch (getSymbolTableIndex(symb)) {
468 case ELF::SHN_COMMON:
469 // Undefined symbols have no address yet.
471 Result = UnknownAddressOrSize;
472 return object_error::success;
474 Result = symb->st_value;
475 return object_error::success;
476 default: Section = getSection(symb);
479 switch (symb->getType()) {
480 case ELF::STT_SECTION:
481 Result = Section ? Section->sh_addr : UnknownAddressOrSize;
482 return object_error::success;
484 case ELF::STT_OBJECT:
485 case ELF::STT_NOTYPE:
486 Result = symb->st_value;
487 return object_error::success;
489 Result = UnknownAddressOrSize;
490 return object_error::success;
494 template<support::endianness target_endianness, bool is64Bits>
495 error_code ELFObjectFile<target_endianness, is64Bits>
496 ::getSymbolAddress(DataRefImpl Symb,
497 uint64_t &Result) const {
498 validateSymbol(Symb);
499 const Elf_Sym *symb = getSymbol(Symb);
500 const Elf_Shdr *Section;
501 switch (getSymbolTableIndex(symb)) {
502 case ELF::SHN_COMMON: // Fall through.
503 // Undefined symbols have no address yet.
505 Result = UnknownAddressOrSize;
506 return object_error::success;
508 Result = reinterpret_cast<uintptr_t>(base()+symb->st_value);
509 return object_error::success;
510 default: Section = getSection(symb);
512 const uint8_t* addr = base();
514 addr += Section->sh_offset;
515 switch (symb->getType()) {
516 case ELF::STT_SECTION:
517 Result = reinterpret_cast<uintptr_t>(addr);
518 return object_error::success;
519 case ELF::STT_FUNC: // Fall through.
520 case ELF::STT_OBJECT: // Fall through.
521 case ELF::STT_NOTYPE:
522 addr += symb->st_value;
523 Result = reinterpret_cast<uintptr_t>(addr);
524 return object_error::success;
526 Result = UnknownAddressOrSize;
527 return object_error::success;
531 template<support::endianness target_endianness, bool is64Bits>
532 error_code ELFObjectFile<target_endianness, is64Bits>
533 ::getSymbolSize(DataRefImpl Symb,
534 uint64_t &Result) const {
535 validateSymbol(Symb);
536 const Elf_Sym *symb = getSymbol(Symb);
537 if (symb->st_size == 0)
538 Result = UnknownAddressOrSize;
539 Result = symb->st_size;
540 return object_error::success;
543 template<support::endianness target_endianness, bool is64Bits>
544 error_code ELFObjectFile<target_endianness, is64Bits>
545 ::getSymbolNMTypeChar(DataRefImpl Symb,
546 char &Result) const {
547 validateSymbol(Symb);
548 const Elf_Sym *symb = getSymbol(Symb);
549 const Elf_Shdr *Section = getSection(symb);
554 switch (Section->sh_type) {
555 case ELF::SHT_PROGBITS:
556 case ELF::SHT_DYNAMIC:
557 switch (Section->sh_flags) {
558 case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR):
560 case (ELF::SHF_ALLOC | ELF::SHF_WRITE):
563 case (ELF::SHF_ALLOC | ELF::SHF_MERGE):
564 case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS):
568 case ELF::SHT_NOBITS: ret = 'b';
572 switch (getSymbolTableIndex(symb)) {
577 case ELF::SHN_ABS: ret = 'a'; break;
578 case ELF::SHN_COMMON: ret = 'c'; break;
581 switch (symb->getBinding()) {
582 case ELF::STB_GLOBAL: ret = ::toupper(ret); break;
584 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF)
587 if (symb->getType() == ELF::STT_OBJECT)
593 if (ret == '?' && symb->getType() == ELF::STT_SECTION) {
595 if (error_code ec = getSymbolName(Symb, name))
597 Result = StringSwitch<char>(name)
598 .StartsWith(".debug", 'N')
599 .StartsWith(".note", 'n')
601 return object_error::success;
605 return object_error::success;
608 template<support::endianness target_endianness, bool is64Bits>
609 error_code ELFObjectFile<target_endianness, is64Bits>
610 ::getSymbolType(DataRefImpl Symb,
611 SymbolRef::Type &Result) const {
612 validateSymbol(Symb);
613 const Elf_Sym *symb = getSymbol(Symb);
615 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) {
616 Result = SymbolRef::ST_External;
617 return object_error::success;
620 switch (symb->getType()) {
622 Result = SymbolRef::ST_Function;
624 case ELF::STT_OBJECT:
625 Result = SymbolRef::ST_Data;
628 Result = SymbolRef::ST_Other;
631 return object_error::success;
634 template<support::endianness target_endianness, bool is64Bits>
635 error_code ELFObjectFile<target_endianness, is64Bits>
636 ::isSymbolGlobal(DataRefImpl Symb,
637 bool &Result) const {
638 validateSymbol(Symb);
639 const Elf_Sym *symb = getSymbol(Symb);
641 Result = symb->getBinding() == ELF::STB_GLOBAL;
642 return object_error::success;
645 template<support::endianness target_endianness, bool is64Bits>
646 error_code ELFObjectFile<target_endianness, is64Bits>
647 ::isSymbolWeak(DataRefImpl Symb,
648 bool &Result) const {
649 validateSymbol(Symb);
650 const Elf_Sym *symb = getSymbol(Symb);
652 Result = symb->getBinding() == ELF::STB_WEAK;
653 return object_error::success;
656 template<support::endianness target_endianness, bool is64Bits>
657 error_code ELFObjectFile<target_endianness, is64Bits>
658 ::isSymbolInternal(DataRefImpl Symb,
659 bool &Result) const {
660 validateSymbol(Symb);
661 const Elf_Sym *symb = getSymbol(Symb);
663 if ( symb->getType() == ELF::STT_FILE
664 || symb->getType() == ELF::STT_SECTION)
667 return object_error::success;
670 template<support::endianness target_endianness, bool is64Bits>
671 error_code ELFObjectFile<target_endianness, is64Bits>
672 ::getSectionNext(DataRefImpl Sec, SectionRef &Result) const {
673 const uint8_t *sec = reinterpret_cast<const uint8_t *>(Sec.p);
674 sec += Header->e_shentsize;
675 Sec.p = reinterpret_cast<intptr_t>(sec);
676 Result = SectionRef(Sec, this);
677 return object_error::success;
680 template<support::endianness target_endianness, bool is64Bits>
681 error_code ELFObjectFile<target_endianness, is64Bits>
682 ::getSectionName(DataRefImpl Sec,
683 StringRef &Result) const {
684 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
685 Result = StringRef(getString(dot_shstrtab_sec, sec->sh_name));
686 return object_error::success;
689 template<support::endianness target_endianness, bool is64Bits>
690 error_code ELFObjectFile<target_endianness, is64Bits>
691 ::getSectionAddress(DataRefImpl Sec,
692 uint64_t &Result) const {
693 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
694 Result = sec->sh_addr;
695 return object_error::success;
698 template<support::endianness target_endianness, bool is64Bits>
699 error_code ELFObjectFile<target_endianness, is64Bits>
700 ::getSectionSize(DataRefImpl Sec,
701 uint64_t &Result) const {
702 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
703 Result = sec->sh_size;
704 return object_error::success;
707 template<support::endianness target_endianness, bool is64Bits>
708 error_code ELFObjectFile<target_endianness, is64Bits>
709 ::getSectionContents(DataRefImpl Sec,
710 StringRef &Result) const {
711 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
712 const char *start = (const char*)base() + sec->sh_offset;
713 Result = StringRef(start, sec->sh_size);
714 return object_error::success;
717 template<support::endianness target_endianness, bool is64Bits>
718 error_code ELFObjectFile<target_endianness, is64Bits>
719 ::getSectionAlignment(DataRefImpl Sec,
720 uint64_t &Result) const {
721 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
722 Result = sec->sh_addralign;
723 return object_error::success;
726 template<support::endianness target_endianness, bool is64Bits>
727 error_code ELFObjectFile<target_endianness, is64Bits>
728 ::isSectionText(DataRefImpl Sec,
729 bool &Result) const {
730 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
731 if (sec->sh_flags & ELF::SHF_EXECINSTR)
735 return object_error::success;
738 template<support::endianness target_endianness, bool is64Bits>
739 error_code ELFObjectFile<target_endianness, is64Bits>
740 ::isSectionData(DataRefImpl Sec,
741 bool &Result) const {
742 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
743 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE)
744 && sec->sh_type == ELF::SHT_PROGBITS)
748 return object_error::success;
751 template<support::endianness target_endianness, bool is64Bits>
752 error_code ELFObjectFile<target_endianness, is64Bits>
753 ::isSectionBSS(DataRefImpl Sec,
754 bool &Result) const {
755 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
756 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE)
757 && sec->sh_type == ELF::SHT_NOBITS)
761 return object_error::success;
764 template<support::endianness target_endianness, bool is64Bits>
765 error_code ELFObjectFile<target_endianness, is64Bits>
766 ::sectionContainsSymbol(DataRefImpl Sec,
768 bool &Result) const {
769 // FIXME: Unimplemented.
771 return object_error::success;
774 template<support::endianness target_endianness, bool is64Bits>
775 relocation_iterator ELFObjectFile<target_endianness, is64Bits>
776 ::getSectionRelBegin(DataRefImpl Sec) const {
778 memset(&RelData, 0, sizeof(RelData));
779 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
780 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec);
781 if (sec != 0 && ittr != SectionRelocMap.end()) {
782 RelData.w.a = getSection(ittr->second[0])->sh_info;
783 RelData.w.b = ittr->second[0];
786 return relocation_iterator(RelocationRef(RelData, this));
789 template<support::endianness target_endianness, bool is64Bits>
790 relocation_iterator ELFObjectFile<target_endianness, is64Bits>
791 ::getSectionRelEnd(DataRefImpl Sec) const {
793 memset(&RelData, 0, sizeof(RelData));
794 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
795 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec);
796 if (sec != 0 && ittr != SectionRelocMap.end()) {
797 // Get the index of the last relocation section for this section.
798 std::size_t relocsecindex = ittr->second[ittr->second.size() - 1];
799 const Elf_Shdr *relocsec = getSection(relocsecindex);
800 RelData.w.a = relocsec->sh_info;
801 RelData.w.b = relocsecindex;
802 RelData.w.c = relocsec->sh_size / relocsec->sh_entsize;
804 return relocation_iterator(RelocationRef(RelData, this));
808 template<support::endianness target_endianness, bool is64Bits>
809 error_code ELFObjectFile<target_endianness, is64Bits>
810 ::getRelocationNext(DataRefImpl Rel,
811 RelocationRef &Result) const {
813 const Elf_Shdr *relocsec = getSection(Rel.w.b);
814 if (Rel.w.c >= (relocsec->sh_size / relocsec->sh_entsize)) {
815 // We have reached the end of the relocations for this section. See if there
816 // is another relocation section.
817 typename RelocMap_t::mapped_type relocseclist =
818 SectionRelocMap.lookup(getSection(Rel.w.a));
820 // Do a binary search for the current reloc section index (which must be
821 // present). Then get the next one.
822 typename RelocMap_t::mapped_type::const_iterator loc =
823 std::lower_bound(relocseclist.begin(), relocseclist.end(), Rel.w.b);
826 // If there is no next one, don't do anything. The ++Rel.w.c above sets Rel
827 // to the end iterator.
828 if (loc != relocseclist.end()) {
833 Result = RelocationRef(Rel, this);
834 return object_error::success;
837 template<support::endianness target_endianness, bool is64Bits>
838 error_code ELFObjectFile<target_endianness, is64Bits>
839 ::getRelocationSymbol(DataRefImpl Rel,
840 SymbolRef &Result) const {
842 const Elf_Shdr *sec = getSection(Rel.w.b);
843 switch (sec->sh_type) {
845 report_fatal_error("Invalid section type in Rel!");
846 case ELF::SHT_REL : {
847 symbolIdx = getRel(Rel)->getSymbol();
850 case ELF::SHT_RELA : {
851 symbolIdx = getRela(Rel)->getSymbol();
855 DataRefImpl SymbolData;
856 IndexMap_t::const_iterator it = SymbolTableSectionsIndexMap.find(sec->sh_link);
857 if (it == SymbolTableSectionsIndexMap.end())
858 report_fatal_error("Relocation symbol table not found!");
859 SymbolData.d.a = symbolIdx;
860 SymbolData.d.b = it->second;
861 Result = SymbolRef(SymbolData, this);
862 return object_error::success;
865 template<support::endianness target_endianness, bool is64Bits>
866 error_code ELFObjectFile<target_endianness, is64Bits>
867 ::getRelocationAddress(DataRefImpl Rel,
868 uint64_t &Result) const {
870 const Elf_Shdr *sec = getSection(Rel.w.b);
871 switch (sec->sh_type) {
873 report_fatal_error("Invalid section type in Rel!");
874 case ELF::SHT_REL : {
875 offset = getRel(Rel)->r_offset;
878 case ELF::SHT_RELA : {
879 offset = getRela(Rel)->r_offset;
885 return object_error::success;
888 template<support::endianness target_endianness, bool is64Bits>
889 error_code ELFObjectFile<target_endianness, is64Bits>
890 ::getRelocationType(DataRefImpl Rel,
891 uint32_t &Result) const {
892 const Elf_Shdr *sec = getSection(Rel.w.b);
893 switch (sec->sh_type) {
895 report_fatal_error("Invalid section type in Rel!");
896 case ELF::SHT_REL : {
897 Result = getRel(Rel)->getType();
900 case ELF::SHT_RELA : {
901 Result = getRela(Rel)->getType();
905 return object_error::success;
908 #define LLVM_ELF_SWITCH_RELOC_TYPE_NAME(enum) \
909 case ELF::enum: res = #enum; break;
911 template<support::endianness target_endianness, bool is64Bits>
912 error_code ELFObjectFile<target_endianness, is64Bits>
913 ::getRelocationTypeName(DataRefImpl Rel,
914 SmallVectorImpl<char> &Result) const {
915 const Elf_Shdr *sec = getSection(Rel.w.b);
918 switch (sec->sh_type) {
920 return object_error::parse_failed;
921 case ELF::SHT_REL : {
922 type = getRel(Rel)->getType();
925 case ELF::SHT_RELA : {
926 type = getRela(Rel)->getType();
930 switch (Header->e_machine) {
933 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_NONE);
934 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_64);
935 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC32);
936 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOT32);
937 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PLT32);
938 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_COPY);
939 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GLOB_DAT);
940 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_JUMP_SLOT);
941 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_RELATIVE);
942 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPCREL);
943 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32);
944 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32S);
945 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_16);
946 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC16);
947 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_8);
948 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC8);
949 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPMOD64);
950 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF64);
951 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF64);
952 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSGD);
953 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSLD);
954 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF32);
955 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTTPOFF);
956 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF32);
957 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC64);
958 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTOFF64);
959 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32);
960 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE32);
961 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE64);
962 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32_TLSDESC);
963 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC_CALL);
964 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC);
971 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_NONE);
972 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32);
973 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC32);
974 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOT32);
975 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PLT32);
976 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_COPY);
977 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GLOB_DAT);
978 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_JUMP_SLOT);
979 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_RELATIVE);
980 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTOFF);
981 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTPC);
982 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32PLT);
983 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF);
984 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE);
985 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTIE);
986 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE);
987 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD);
988 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM);
989 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_16);
990 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC16);
991 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_8);
992 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC8);
993 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_32);
994 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_PUSH);
995 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_CALL);
996 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_POP);
997 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_32);
998 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_PUSH);
999 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_CALL);
1000 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_POP);
1001 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDO_32);
1002 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE_32);
1003 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE_32);
1004 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPMOD32);
1005 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPOFF32);
1006 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF32);
1007 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTDESC);
1008 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC_CALL);
1009 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC);
1010 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_IRELATIVE);
1018 Result.append(res.begin(), res.end());
1019 return object_error::success;
1022 #undef LLVM_ELF_SWITCH_RELOC_TYPE_NAME
1024 template<support::endianness target_endianness, bool is64Bits>
1025 error_code ELFObjectFile<target_endianness, is64Bits>
1026 ::getRelocationAdditionalInfo(DataRefImpl Rel,
1027 int64_t &Result) const {
1028 const Elf_Shdr *sec = getSection(Rel.w.b);
1029 switch (sec->sh_type) {
1031 report_fatal_error("Invalid section type in Rel!");
1032 case ELF::SHT_REL : {
1034 return object_error::success;
1036 case ELF::SHT_RELA : {
1037 Result = getRela(Rel)->r_addend;
1038 return object_error::success;
1043 template<support::endianness target_endianness, bool is64Bits>
1044 error_code ELFObjectFile<target_endianness, is64Bits>
1045 ::getRelocationValueString(DataRefImpl Rel,
1046 SmallVectorImpl<char> &Result) const {
1047 const Elf_Shdr *sec = getSection(Rel.w.b);
1051 uint16_t symbol_index = 0;
1052 switch (sec->sh_type) {
1054 return object_error::parse_failed;
1055 case ELF::SHT_REL : {
1056 type = getRel(Rel)->getType();
1057 symbol_index = getRel(Rel)->getSymbol();
1058 // TODO: Read implicit addend from section data.
1061 case ELF::SHT_RELA : {
1062 type = getRela(Rel)->getType();
1063 symbol_index = getRela(Rel)->getSymbol();
1064 addend = getRela(Rel)->r_addend;
1068 const Elf_Sym *symb = getEntry<Elf_Sym>(sec->sh_link, symbol_index);
1070 if (error_code ec = getSymbolName(symb, symname))
1072 switch (Header->e_machine) {
1073 case ELF::EM_X86_64:
1075 case ELF::R_X86_64_32S:
1078 case ELF::R_X86_64_PC32: {
1080 raw_string_ostream fmt(fmtbuf);
1081 fmt << symname << (addend < 0 ? "" : "+") << addend << "-P";
1083 Result.append(fmtbuf.begin(), fmtbuf.end());
1094 Result.append(res.begin(), res.end());
1095 return object_error::success;
1098 template<support::endianness target_endianness, bool is64Bits>
1099 ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object
1101 : ObjectFile(Binary::isELF, Object, ec)
1102 , SectionHeaderTable(0)
1103 , dot_shstrtab_sec(0)
1104 , dot_strtab_sec(0) {
1105 Header = reinterpret_cast<const Elf_Ehdr *>(base());
1107 if (Header->e_shoff == 0)
1110 SectionHeaderTable =
1111 reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff);
1112 uint64_t SectionTableSize = getNumSections() * Header->e_shentsize;
1113 if (!( (const uint8_t *)SectionHeaderTable + SectionTableSize
1114 <= base() + Data->getBufferSize()))
1115 // FIXME: Proper error handling.
1116 report_fatal_error("Section table goes past end of file!");
1119 // To find the symbol tables we walk the section table to find SHT_SYMTAB.
1120 const Elf_Shdr* SymbolTableSectionHeaderIndex = 0;
1121 const Elf_Shdr* sh = reinterpret_cast<const Elf_Shdr*>(SectionHeaderTable);
1122 for (uint64_t i = 0, e = getNumSections(); i != e; ++i) {
1123 if (sh->sh_type == ELF::SHT_SYMTAB_SHNDX) {
1124 if (SymbolTableSectionHeaderIndex)
1125 // FIXME: Proper error handling.
1126 report_fatal_error("More than one .symtab_shndx!");
1127 SymbolTableSectionHeaderIndex = sh;
1129 if (sh->sh_type == ELF::SHT_SYMTAB) {
1130 SymbolTableSectionsIndexMap[i] = SymbolTableSections.size();
1131 SymbolTableSections.push_back(sh);
1133 if (sh->sh_type == ELF::SHT_REL || sh->sh_type == ELF::SHT_RELA) {
1134 SectionRelocMap[getSection(sh->sh_info)].push_back(i);
1139 // Sort section relocation lists by index.
1140 for (typename RelocMap_t::iterator i = SectionRelocMap.begin(),
1141 e = SectionRelocMap.end(); i != e; ++i) {
1142 std::sort(i->second.begin(), i->second.end());
1145 // Get string table sections.
1146 dot_shstrtab_sec = getSection(getStringTableIndex());
1147 if (dot_shstrtab_sec) {
1148 // Verify that the last byte in the string table in a null.
1149 if (((const char*)base() + dot_shstrtab_sec->sh_offset)
1150 [dot_shstrtab_sec->sh_size - 1] != 0)
1151 // FIXME: Proper error handling.
1152 report_fatal_error("String table must end with a null terminator!");
1155 // Merge this into the above loop.
1156 for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable),
1157 *e = i + getNumSections() * Header->e_shentsize;
1158 i != e; i += Header->e_shentsize) {
1159 const Elf_Shdr *sh = reinterpret_cast<const Elf_Shdr*>(i);
1160 if (sh->sh_type == ELF::SHT_STRTAB) {
1161 StringRef SectionName(getString(dot_shstrtab_sec, sh->sh_name));
1162 if (SectionName == ".strtab") {
1163 if (dot_strtab_sec != 0)
1164 // FIXME: Proper error handling.
1165 report_fatal_error("Already found section named .strtab!");
1166 dot_strtab_sec = sh;
1167 const char *dot_strtab = (const char*)base() + sh->sh_offset;
1168 if (dot_strtab[sh->sh_size - 1] != 0)
1169 // FIXME: Proper error handling.
1170 report_fatal_error("String table must end with a null terminator!");
1175 // Build symbol name side-mapping if there is one.
1176 if (SymbolTableSectionHeaderIndex) {
1177 const Elf_Word *ShndxTable = reinterpret_cast<const Elf_Word*>(base() +
1178 SymbolTableSectionHeaderIndex->sh_offset);
1180 for (symbol_iterator si = begin_symbols(),
1181 se = end_symbols(); si != se; si.increment(ec)) {
1183 report_fatal_error("Fewer extended symbol table entries than symbols!");
1184 if (*ShndxTable != ELF::SHN_UNDEF)
1185 ExtendedSymbolTable[getSymbol(si->getRawDataRefImpl())] = *ShndxTable;
1191 template<support::endianness target_endianness, bool is64Bits>
1192 symbol_iterator ELFObjectFile<target_endianness, is64Bits>
1193 ::begin_symbols() const {
1194 DataRefImpl SymbolData;
1195 memset(&SymbolData, 0, sizeof(SymbolData));
1196 if (SymbolTableSections.size() == 0) {
1197 SymbolData.d.a = std::numeric_limits<uint32_t>::max();
1198 SymbolData.d.b = std::numeric_limits<uint32_t>::max();
1200 SymbolData.d.a = 1; // The 0th symbol in ELF is fake.
1203 return symbol_iterator(SymbolRef(SymbolData, this));
1206 template<support::endianness target_endianness, bool is64Bits>
1207 symbol_iterator ELFObjectFile<target_endianness, is64Bits>
1208 ::end_symbols() const {
1209 DataRefImpl SymbolData;
1210 memset(&SymbolData, 0, sizeof(SymbolData));
1211 SymbolData.d.a = std::numeric_limits<uint32_t>::max();
1212 SymbolData.d.b = std::numeric_limits<uint32_t>::max();
1213 return symbol_iterator(SymbolRef(SymbolData, this));
1216 template<support::endianness target_endianness, bool is64Bits>
1217 section_iterator ELFObjectFile<target_endianness, is64Bits>
1218 ::begin_sections() const {
1220 memset(&ret, 0, sizeof(DataRefImpl));
1221 ret.p = reinterpret_cast<intptr_t>(base() + Header->e_shoff);
1222 return section_iterator(SectionRef(ret, this));
1225 template<support::endianness target_endianness, bool is64Bits>
1226 section_iterator ELFObjectFile<target_endianness, is64Bits>
1227 ::end_sections() const {
1229 memset(&ret, 0, sizeof(DataRefImpl));
1230 ret.p = reinterpret_cast<intptr_t>(base()
1232 + (Header->e_shentsize*getNumSections()));
1233 return section_iterator(SectionRef(ret, this));
1236 template<support::endianness target_endianness, bool is64Bits>
1237 uint8_t ELFObjectFile<target_endianness, is64Bits>::getBytesInAddress() const {
1238 return is64Bits ? 8 : 4;
1241 template<support::endianness target_endianness, bool is64Bits>
1242 StringRef ELFObjectFile<target_endianness, is64Bits>
1243 ::getFileFormatName() const {
1244 switch(Header->e_ident[ELF::EI_CLASS]) {
1245 case ELF::ELFCLASS32:
1246 switch(Header->e_machine) {
1248 return "ELF32-i386";
1249 case ELF::EM_X86_64:
1250 return "ELF32-x86-64";
1254 return "ELF32-unknown";
1256 case ELF::ELFCLASS64:
1257 switch(Header->e_machine) {
1259 return "ELF64-i386";
1260 case ELF::EM_X86_64:
1261 return "ELF64-x86-64";
1263 return "ELF64-unknown";
1266 // FIXME: Proper error handling.
1267 report_fatal_error("Invalid ELFCLASS!");
1271 template<support::endianness target_endianness, bool is64Bits>
1272 unsigned ELFObjectFile<target_endianness, is64Bits>::getArch() const {
1273 switch(Header->e_machine) {
1276 case ELF::EM_X86_64:
1277 return Triple::x86_64;
1281 return Triple::UnknownArch;
1285 template<support::endianness target_endianness, bool is64Bits>
1286 uint64_t ELFObjectFile<target_endianness, is64Bits>::getNumSections() const {
1287 if (Header->e_shnum == ELF::SHN_UNDEF)
1288 return SectionHeaderTable->sh_size;
1289 return Header->e_shnum;
1292 template<support::endianness target_endianness, bool is64Bits>
1294 ELFObjectFile<target_endianness, is64Bits>::getStringTableIndex() const {
1295 if (Header->e_shnum == ELF::SHN_UNDEF) {
1296 if (Header->e_shstrndx == ELF::SHN_HIRESERVE)
1297 return SectionHeaderTable->sh_link;
1298 if (Header->e_shstrndx >= getNumSections())
1301 return Header->e_shstrndx;
1305 template<support::endianness target_endianness, bool is64Bits>
1306 template<typename T>
1308 ELFObjectFile<target_endianness, is64Bits>::getEntry(uint16_t Section,
1309 uint32_t Entry) const {
1310 return getEntry<T>(getSection(Section), Entry);
1313 template<support::endianness target_endianness, bool is64Bits>
1314 template<typename T>
1316 ELFObjectFile<target_endianness, is64Bits>::getEntry(const Elf_Shdr * Section,
1317 uint32_t Entry) const {
1318 return reinterpret_cast<const T *>(
1320 + Section->sh_offset
1321 + (Entry * Section->sh_entsize));
1324 template<support::endianness target_endianness, bool is64Bits>
1325 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Sym *
1326 ELFObjectFile<target_endianness, is64Bits>::getSymbol(DataRefImpl Symb) const {
1327 return getEntry<Elf_Sym>(SymbolTableSections[Symb.d.b], Symb.d.a);
1330 template<support::endianness target_endianness, bool is64Bits>
1331 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rel *
1332 ELFObjectFile<target_endianness, is64Bits>::getRel(DataRefImpl Rel) const {
1333 return getEntry<Elf_Rel>(Rel.w.b, Rel.w.c);
1336 template<support::endianness target_endianness, bool is64Bits>
1337 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rela *
1338 ELFObjectFile<target_endianness, is64Bits>::getRela(DataRefImpl Rela) const {
1339 return getEntry<Elf_Rela>(Rela.w.b, Rela.w.c);
1342 template<support::endianness target_endianness, bool is64Bits>
1343 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
1344 ELFObjectFile<target_endianness, is64Bits>::getSection(DataRefImpl Symb) const {
1345 const Elf_Shdr *sec = getSection(Symb.d.b);
1346 if (sec->sh_type != ELF::SHT_SYMTAB || sec->sh_type != ELF::SHT_DYNSYM)
1347 // FIXME: Proper error handling.
1348 report_fatal_error("Invalid symbol table section!");
1352 template<support::endianness target_endianness, bool is64Bits>
1353 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
1354 ELFObjectFile<target_endianness, is64Bits>::getSection(uint32_t index) const {
1357 if (!SectionHeaderTable || index >= getNumSections())
1358 // FIXME: Proper error handling.
1359 report_fatal_error("Invalid section index!");
1361 return reinterpret_cast<const Elf_Shdr *>(
1362 reinterpret_cast<const char *>(SectionHeaderTable)
1363 + (index * Header->e_shentsize));
1366 template<support::endianness target_endianness, bool is64Bits>
1367 const char *ELFObjectFile<target_endianness, is64Bits>
1368 ::getString(uint32_t section,
1369 ELF::Elf32_Word offset) const {
1370 return getString(getSection(section), offset);
1373 template<support::endianness target_endianness, bool is64Bits>
1374 const char *ELFObjectFile<target_endianness, is64Bits>
1375 ::getString(const Elf_Shdr *section,
1376 ELF::Elf32_Word offset) const {
1377 assert(section && section->sh_type == ELF::SHT_STRTAB && "Invalid section!");
1378 if (offset >= section->sh_size)
1379 // FIXME: Proper error handling.
1380 report_fatal_error("Symbol name offset outside of string table!");
1381 return (const char *)base() + section->sh_offset + offset;
1384 template<support::endianness target_endianness, bool is64Bits>
1385 error_code ELFObjectFile<target_endianness, is64Bits>
1386 ::getSymbolName(const Elf_Sym *symb,
1387 StringRef &Result) const {
1388 if (symb->st_name == 0) {
1389 const Elf_Shdr *section = getSection(symb);
1393 Result = getString(dot_shstrtab_sec, section->sh_name);
1394 return object_error::success;
1397 // Use the default symbol table name section.
1398 Result = getString(dot_strtab_sec, symb->st_name);
1399 return object_error::success;
1402 // EI_CLASS, EI_DATA.
1403 static std::pair<unsigned char, unsigned char>
1404 getElfArchType(MemoryBuffer *Object) {
1405 if (Object->getBufferSize() < ELF::EI_NIDENT)
1406 return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE);
1407 return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS]
1408 , (uint8_t)Object->getBufferStart()[ELF::EI_DATA]);
1413 ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) {
1414 std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object);
1416 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
1417 return new ELFObjectFile<support::little, false>(Object, ec);
1418 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
1419 return new ELFObjectFile<support::big, false>(Object, ec);
1420 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB)
1421 return new ELFObjectFile<support::little, true>(Object, ec);
1422 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
1423 return new ELFObjectFile<support::big, true>(Object, ec);
1424 // FIXME: Proper error handling.
1425 report_fatal_error("Not an ELF object file!");
1428 } // end namespace llvm