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_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 getSymbolType(DataRefImpl Symb, SymbolRef::SymbolType &Res) const;
336 virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const;
337 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const;
338 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const;
339 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const;
340 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const;
341 virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const;
342 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const;
343 virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const;
344 virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const;
345 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
347 virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const;
348 virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const;
350 virtual error_code getRelocationNext(DataRefImpl Rel,
351 RelocationRef &Res) const;
352 virtual error_code getRelocationAddress(DataRefImpl Rel,
353 uint64_t &Res) const;
354 virtual error_code getRelocationSymbol(DataRefImpl Rel,
355 SymbolRef &Res) const;
356 virtual error_code getRelocationType(DataRefImpl Rel,
357 uint32_t &Res) const;
358 virtual error_code getRelocationTypeName(DataRefImpl Rel,
359 SmallVectorImpl<char> &Result) const;
360 virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel,
362 virtual error_code getRelocationValueString(DataRefImpl Rel,
363 SmallVectorImpl<char> &Result) const;
366 ELFObjectFile(MemoryBuffer *Object, error_code &ec);
367 virtual symbol_iterator begin_symbols() const;
368 virtual symbol_iterator end_symbols() const;
369 virtual section_iterator begin_sections() const;
370 virtual section_iterator end_sections() const;
372 virtual uint8_t getBytesInAddress() const;
373 virtual StringRef getFileFormatName() const;
374 virtual unsigned getArch() const;
376 uint64_t getNumSections() const;
377 uint64_t getStringTableIndex() const;
378 uint64_t getSymbolTableIndex(const Elf_Sym *symb) const;
379 const Elf_Shdr *getSection(const Elf_Sym *symb) const;
383 template<support::endianness target_endianness, bool is64Bits>
384 void ELFObjectFile<target_endianness, is64Bits>
385 ::validateSymbol(DataRefImpl Symb) const {
386 const Elf_Sym *symb = getSymbol(Symb);
387 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b];
388 // FIXME: We really need to do proper error handling in the case of an invalid
389 // input file. Because we don't use exceptions, I think we'll just pass
390 // an error object around.
392 && SymbolTableSection
393 && symb >= (const Elf_Sym*)(base()
394 + SymbolTableSection->sh_offset)
395 && symb < (const Elf_Sym*)(base()
396 + SymbolTableSection->sh_offset
397 + SymbolTableSection->sh_size)))
398 // FIXME: Proper error handling.
399 report_fatal_error("Symb must point to a valid symbol!");
402 template<support::endianness target_endianness, bool is64Bits>
403 error_code ELFObjectFile<target_endianness, is64Bits>
404 ::getSymbolNext(DataRefImpl Symb,
405 SymbolRef &Result) const {
406 validateSymbol(Symb);
407 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b];
410 // Check to see if we are at the end of this symbol table.
411 if (Symb.d.a >= SymbolTableSection->getEntityCount()) {
412 // We are at the end. If there are other symbol tables, jump to them.
414 Symb.d.a = 1; // The 0th symbol in ELF is fake.
415 // Otherwise return the terminator.
416 if (Symb.d.b >= SymbolTableSections.size()) {
417 Symb.d.a = std::numeric_limits<uint32_t>::max();
418 Symb.d.b = std::numeric_limits<uint32_t>::max();
422 Result = SymbolRef(Symb, this);
423 return object_error::success;
426 template<support::endianness target_endianness, bool is64Bits>
427 error_code ELFObjectFile<target_endianness, is64Bits>
428 ::getSymbolName(DataRefImpl Symb,
429 StringRef &Result) const {
430 validateSymbol(Symb);
431 const Elf_Sym *symb = getSymbol(Symb);
432 return getSymbolName(symb, Result);
435 template<support::endianness target_endianness, bool is64Bits>
436 uint64_t ELFObjectFile<target_endianness, is64Bits>
437 ::getSymbolTableIndex(const Elf_Sym *symb) const {
438 if (symb->st_shndx == ELF::SHN_XINDEX)
439 return ExtendedSymbolTable.lookup(symb);
440 return symb->st_shndx;
443 template<support::endianness target_endianness, bool is64Bits>
444 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
445 ELFObjectFile<target_endianness, is64Bits>
446 ::getSection(const Elf_Sym *symb) const {
447 if (symb->st_shndx == ELF::SHN_XINDEX) {
448 if (!ExtendedSymbolTable.count(symb))
450 return getSection(ExtendedSymbolTable.lookup(symb));
452 if (symb->st_shndx >= ELF::SHN_LORESERVE)
454 return getSection(symb->st_shndx);
457 template<support::endianness target_endianness, bool is64Bits>
458 error_code ELFObjectFile<target_endianness, is64Bits>
459 ::getSymbolOffset(DataRefImpl Symb,
460 uint64_t &Result) const {
461 validateSymbol(Symb);
462 const Elf_Sym *symb = getSymbol(Symb);
463 const Elf_Shdr *Section;
464 switch (getSymbolTableIndex(symb)) {
465 case ELF::SHN_COMMON:
466 // Undefined symbols have no address yet.
468 Result = UnknownAddressOrSize;
469 return object_error::success;
471 Result = symb->st_value;
472 return object_error::success;
473 default: Section = getSection(symb);
476 switch (symb->getType()) {
477 case ELF::STT_SECTION:
478 Result = Section ? Section->sh_addr : UnknownAddressOrSize;
479 return object_error::success;
481 case ELF::STT_OBJECT:
482 case ELF::STT_NOTYPE:
483 Result = symb->st_value;
484 return object_error::success;
486 Result = UnknownAddressOrSize;
487 return object_error::success;
491 template<support::endianness target_endianness, bool is64Bits>
492 error_code ELFObjectFile<target_endianness, is64Bits>
493 ::getSymbolAddress(DataRefImpl Symb,
494 uint64_t &Result) const {
495 validateSymbol(Symb);
496 const Elf_Sym *symb = getSymbol(Symb);
497 const Elf_Shdr *Section;
498 switch (getSymbolTableIndex(symb)) {
499 case ELF::SHN_COMMON: // Fall through.
500 // Undefined symbols have no address yet.
502 Result = UnknownAddressOrSize;
503 return object_error::success;
505 Result = reinterpret_cast<uintptr_t>(base()+symb->st_value);
506 return object_error::success;
507 default: Section = getSection(symb);
509 const uint8_t* addr = base();
511 addr += Section->sh_offset;
512 switch (symb->getType()) {
513 case ELF::STT_SECTION:
514 Result = reinterpret_cast<uintptr_t>(addr);
515 return object_error::success;
516 case ELF::STT_FUNC: // Fall through.
517 case ELF::STT_OBJECT: // Fall through.
518 case ELF::STT_NOTYPE:
519 addr += symb->st_value;
520 Result = reinterpret_cast<uintptr_t>(addr);
521 return object_error::success;
523 Result = UnknownAddressOrSize;
524 return object_error::success;
528 template<support::endianness target_endianness, bool is64Bits>
529 error_code ELFObjectFile<target_endianness, is64Bits>
530 ::getSymbolSize(DataRefImpl Symb,
531 uint64_t &Result) const {
532 validateSymbol(Symb);
533 const Elf_Sym *symb = getSymbol(Symb);
534 if (symb->st_size == 0)
535 Result = UnknownAddressOrSize;
536 Result = symb->st_size;
537 return object_error::success;
540 template<support::endianness target_endianness, bool is64Bits>
541 error_code ELFObjectFile<target_endianness, is64Bits>
542 ::getSymbolNMTypeChar(DataRefImpl Symb,
543 char &Result) const {
544 validateSymbol(Symb);
545 const Elf_Sym *symb = getSymbol(Symb);
546 const Elf_Shdr *Section = getSection(symb);
551 switch (Section->sh_type) {
552 case ELF::SHT_PROGBITS:
553 case ELF::SHT_DYNAMIC:
554 switch (Section->sh_flags) {
555 case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR):
557 case (ELF::SHF_ALLOC | ELF::SHF_WRITE):
560 case (ELF::SHF_ALLOC | ELF::SHF_MERGE):
561 case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS):
565 case ELF::SHT_NOBITS: ret = 'b';
569 switch (getSymbolTableIndex(symb)) {
574 case ELF::SHN_ABS: ret = 'a'; break;
575 case ELF::SHN_COMMON: ret = 'c'; break;
578 switch (symb->getBinding()) {
579 case ELF::STB_GLOBAL: ret = ::toupper(ret); break;
581 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF)
584 if (symb->getType() == ELF::STT_OBJECT)
590 if (ret == '?' && symb->getType() == ELF::STT_SECTION) {
592 if (error_code ec = getSymbolName(Symb, name))
594 Result = StringSwitch<char>(name)
595 .StartsWith(".debug", 'N')
596 .StartsWith(".note", 'n')
598 return object_error::success;
602 return object_error::success;
605 template<support::endianness target_endianness, bool is64Bits>
606 error_code ELFObjectFile<target_endianness, is64Bits>
607 ::getSymbolType(DataRefImpl Symb,
608 SymbolRef::SymbolType &Result) const {
609 validateSymbol(Symb);
610 const Elf_Sym *symb = getSymbol(Symb);
612 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) {
613 Result = SymbolRef::ST_External;
614 return object_error::success;
617 switch (symb->getType()) {
619 Result = SymbolRef::ST_Function;
621 case ELF::STT_OBJECT:
622 Result = SymbolRef::ST_Data;
625 Result = SymbolRef::ST_Other;
628 return object_error::success;
631 template<support::endianness target_endianness, bool is64Bits>
632 error_code ELFObjectFile<target_endianness, is64Bits>
633 ::isSymbolGlobal(DataRefImpl Symb,
634 bool &Result) const {
635 validateSymbol(Symb);
636 const Elf_Sym *symb = getSymbol(Symb);
638 Result = symb->getBinding() == ELF::STB_GLOBAL;
639 return object_error::success;
642 template<support::endianness target_endianness, bool is64Bits>
643 error_code ELFObjectFile<target_endianness, is64Bits>
644 ::isSymbolInternal(DataRefImpl Symb,
645 bool &Result) const {
646 validateSymbol(Symb);
647 const Elf_Sym *symb = getSymbol(Symb);
649 if ( symb->getType() == ELF::STT_FILE
650 || symb->getType() == ELF::STT_SECTION)
653 return object_error::success;
656 template<support::endianness target_endianness, bool is64Bits>
657 error_code ELFObjectFile<target_endianness, is64Bits>
658 ::getSectionNext(DataRefImpl Sec, SectionRef &Result) const {
659 const uint8_t *sec = reinterpret_cast<const uint8_t *>(Sec.p);
660 sec += Header->e_shentsize;
661 Sec.p = reinterpret_cast<intptr_t>(sec);
662 Result = SectionRef(Sec, this);
663 return object_error::success;
666 template<support::endianness target_endianness, bool is64Bits>
667 error_code ELFObjectFile<target_endianness, is64Bits>
668 ::getSectionName(DataRefImpl Sec,
669 StringRef &Result) const {
670 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
671 Result = StringRef(getString(dot_shstrtab_sec, sec->sh_name));
672 return object_error::success;
675 template<support::endianness target_endianness, bool is64Bits>
676 error_code ELFObjectFile<target_endianness, is64Bits>
677 ::getSectionAddress(DataRefImpl Sec,
678 uint64_t &Result) const {
679 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
680 Result = sec->sh_addr;
681 return object_error::success;
684 template<support::endianness target_endianness, bool is64Bits>
685 error_code ELFObjectFile<target_endianness, is64Bits>
686 ::getSectionSize(DataRefImpl Sec,
687 uint64_t &Result) const {
688 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
689 Result = sec->sh_size;
690 return object_error::success;
693 template<support::endianness target_endianness, bool is64Bits>
694 error_code ELFObjectFile<target_endianness, is64Bits>
695 ::getSectionContents(DataRefImpl Sec,
696 StringRef &Result) const {
697 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
698 const char *start = (const char*)base() + sec->sh_offset;
699 Result = StringRef(start, sec->sh_size);
700 return object_error::success;
703 template<support::endianness target_endianness, bool is64Bits>
704 error_code ELFObjectFile<target_endianness, is64Bits>
705 ::getSectionAlignment(DataRefImpl Sec,
706 uint64_t &Result) const {
707 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
708 Result = sec->sh_addralign;
709 return object_error::success;
712 template<support::endianness target_endianness, bool is64Bits>
713 error_code ELFObjectFile<target_endianness, is64Bits>
714 ::isSectionText(DataRefImpl Sec,
715 bool &Result) const {
716 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
717 if (sec->sh_flags & ELF::SHF_EXECINSTR)
721 return object_error::success;
724 template<support::endianness target_endianness, bool is64Bits>
725 error_code ELFObjectFile<target_endianness, is64Bits>
726 ::isSectionData(DataRefImpl Sec,
727 bool &Result) const {
728 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
729 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE)
730 && sec->sh_type == ELF::SHT_PROGBITS)
734 return object_error::success;
737 template<support::endianness target_endianness, bool is64Bits>
738 error_code ELFObjectFile<target_endianness, is64Bits>
739 ::isSectionBSS(DataRefImpl Sec,
740 bool &Result) const {
741 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
742 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE)
743 && sec->sh_type == ELF::SHT_NOBITS)
747 return object_error::success;
750 template<support::endianness target_endianness, bool is64Bits>
751 error_code ELFObjectFile<target_endianness, is64Bits>
752 ::sectionContainsSymbol(DataRefImpl Sec,
754 bool &Result) const {
755 // FIXME: Unimplemented.
757 return object_error::success;
760 template<support::endianness target_endianness, bool is64Bits>
761 relocation_iterator ELFObjectFile<target_endianness, is64Bits>
762 ::getSectionRelBegin(DataRefImpl Sec) const {
764 memset(&RelData, 0, sizeof(RelData));
765 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
766 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec);
767 if (sec != 0 && ittr != SectionRelocMap.end()) {
768 RelData.w.a = getSection(ittr->second[0])->sh_link;
769 RelData.w.b = ittr->second[0];
772 return relocation_iterator(RelocationRef(RelData, this));
775 template<support::endianness target_endianness, bool is64Bits>
776 relocation_iterator ELFObjectFile<target_endianness, is64Bits>
777 ::getSectionRelEnd(DataRefImpl Sec) const {
779 memset(&RelData, 0, sizeof(RelData));
780 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
781 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec);
782 if (sec != 0 && ittr != SectionRelocMap.end()) {
783 // Get the index of the last relocation section for this section.
784 std::size_t relocsecindex = ittr->second[ittr->second.size() - 1];
785 const Elf_Shdr *relocsec = getSection(relocsecindex);
786 RelData.w.a = relocsec->sh_link;
787 RelData.w.b = relocsecindex;
788 RelData.w.c = relocsec->sh_size / relocsec->sh_entsize;
790 return relocation_iterator(RelocationRef(RelData, this));
794 template<support::endianness target_endianness, bool is64Bits>
795 error_code ELFObjectFile<target_endianness, is64Bits>
796 ::getRelocationNext(DataRefImpl Rel,
797 RelocationRef &Result) const {
799 const Elf_Shdr *relocsec = getSection(Rel.w.b);
800 if (Rel.w.c >= (relocsec->sh_size / relocsec->sh_entsize)) {
801 // We have reached the end of the relocations for this section. See if there
802 // is another relocation section.
803 typename RelocMap_t::mapped_type relocseclist =
804 SectionRelocMap.lookup(getSection(Rel.w.a));
806 // Do a binary search for the current reloc section index (which must be
807 // present). Then get the next one.
808 typename RelocMap_t::mapped_type::const_iterator loc =
809 std::lower_bound(relocseclist.begin(), relocseclist.end(), Rel.w.b);
812 // If there is no next one, don't do anything. The ++Rel.w.c above sets Rel
813 // to the end iterator.
814 if (loc != relocseclist.end()) {
819 Result = RelocationRef(Rel, this);
820 return object_error::success;
823 template<support::endianness target_endianness, bool is64Bits>
824 error_code ELFObjectFile<target_endianness, is64Bits>
825 ::getRelocationSymbol(DataRefImpl Rel,
826 SymbolRef &Result) const {
828 const Elf_Shdr *sec = getSection(Rel.w.b);
829 switch (sec->sh_type) {
831 report_fatal_error("Invalid section type in Rel!");
832 case ELF::SHT_REL : {
833 symbolIdx = getRel(Rel)->getSymbol();
836 case ELF::SHT_RELA : {
837 symbolIdx = getRela(Rel)->getSymbol();
841 DataRefImpl SymbolData;
842 IndexMap_t::const_iterator it = SymbolTableSectionsIndexMap.find(sec->sh_link);
843 if (it == SymbolTableSectionsIndexMap.end())
844 report_fatal_error("Relocation symbol table not found!");
845 SymbolData.d.a = symbolIdx;
846 SymbolData.d.b = it->second;
847 Result = SymbolRef(SymbolData, this);
848 return object_error::success;
851 template<support::endianness target_endianness, bool is64Bits>
852 error_code ELFObjectFile<target_endianness, is64Bits>
853 ::getRelocationAddress(DataRefImpl Rel,
854 uint64_t &Result) const {
856 const Elf_Shdr *sec = getSection(Rel.w.b);
857 switch (sec->sh_type) {
859 report_fatal_error("Invalid section type in Rel!");
860 case ELF::SHT_REL : {
861 offset = getRel(Rel)->r_offset;
864 case ELF::SHT_RELA : {
865 offset = getRela(Rel)->r_offset;
871 return object_error::success;
874 template<support::endianness target_endianness, bool is64Bits>
875 error_code ELFObjectFile<target_endianness, is64Bits>
876 ::getRelocationType(DataRefImpl Rel,
877 uint32_t &Result) const {
878 const Elf_Shdr *sec = getSection(Rel.w.b);
879 switch (sec->sh_type) {
881 report_fatal_error("Invalid section type in Rel!");
882 case ELF::SHT_REL : {
883 Result = getRel(Rel)->getType();
886 case ELF::SHT_RELA : {
887 Result = getRela(Rel)->getType();
891 return object_error::success;
894 #define LLVM_ELF_SWITCH_RELOC_TYPE_NAME(enum) \
895 case ELF::enum: res = #enum; break;
897 template<support::endianness target_endianness, bool is64Bits>
898 error_code ELFObjectFile<target_endianness, is64Bits>
899 ::getRelocationTypeName(DataRefImpl Rel,
900 SmallVectorImpl<char> &Result) const {
901 const Elf_Shdr *sec = getSection(Rel.w.b);
904 switch (sec->sh_type) {
906 return object_error::parse_failed;
907 case ELF::SHT_REL : {
908 type = getRel(Rel)->getType();
911 case ELF::SHT_RELA : {
912 type = getRela(Rel)->getType();
916 switch (Header->e_machine) {
919 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_NONE);
920 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_64);
921 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC32);
922 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOT32);
923 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PLT32);
924 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_COPY);
925 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GLOB_DAT);
926 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_JUMP_SLOT);
927 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_RELATIVE);
928 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPCREL);
929 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32);
930 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32S);
931 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_16);
932 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC16);
933 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_8);
934 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC8);
935 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPMOD64);
936 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF64);
937 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF64);
938 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSGD);
939 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSLD);
940 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF32);
941 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTTPOFF);
942 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF32);
943 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC64);
944 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTOFF64);
945 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32);
946 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE32);
947 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE64);
948 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32_TLSDESC);
949 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC_CALL);
950 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC);
957 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_NONE);
958 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32);
959 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC32);
960 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOT32);
961 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PLT32);
962 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_COPY);
963 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GLOB_DAT);
964 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_JUMP_SLOT);
965 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_RELATIVE);
966 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTOFF);
967 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTPC);
968 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32PLT);
969 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF);
970 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE);
971 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTIE);
972 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE);
973 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD);
974 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM);
975 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_16);
976 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC16);
977 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_8);
978 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC8);
979 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_32);
980 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_PUSH);
981 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_CALL);
982 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_POP);
983 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_32);
984 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_PUSH);
985 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_CALL);
986 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_POP);
987 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDO_32);
988 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE_32);
989 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE_32);
990 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPMOD32);
991 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPOFF32);
992 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF32);
993 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTDESC);
994 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC_CALL);
995 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC);
996 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_IRELATIVE);
1004 Result.append(res.begin(), res.end());
1005 return object_error::success;
1008 #undef LLVM_ELF_SWITCH_RELOC_TYPE_NAME
1010 template<support::endianness target_endianness, bool is64Bits>
1011 error_code ELFObjectFile<target_endianness, is64Bits>
1012 ::getRelocationAdditionalInfo(DataRefImpl Rel,
1013 int64_t &Result) const {
1014 const Elf_Shdr *sec = getSection(Rel.w.b);
1015 switch (sec->sh_type) {
1017 report_fatal_error("Invalid section type in Rel!");
1018 case ELF::SHT_REL : {
1020 return object_error::success;
1022 case ELF::SHT_RELA : {
1023 Result = getRela(Rel)->r_addend;
1024 return object_error::success;
1029 template<support::endianness target_endianness, bool is64Bits>
1030 error_code ELFObjectFile<target_endianness, is64Bits>
1031 ::getRelocationValueString(DataRefImpl Rel,
1032 SmallVectorImpl<char> &Result) const {
1033 const Elf_Shdr *sec = getSection(Rel.w.b);
1037 uint16_t symbol_index = 0;
1038 switch (sec->sh_type) {
1040 return object_error::parse_failed;
1041 case ELF::SHT_REL : {
1042 type = getRel(Rel)->getType();
1043 symbol_index = getRel(Rel)->getSymbol();
1044 // TODO: Read implicit addend from section data.
1047 case ELF::SHT_RELA : {
1048 type = getRela(Rel)->getType();
1049 symbol_index = getRela(Rel)->getSymbol();
1050 addend = getRela(Rel)->r_addend;
1054 const Elf_Sym *symb = getEntry<Elf_Sym>(sec->sh_link, symbol_index);
1056 if (error_code ec = getSymbolName(symb, symname))
1058 switch (Header->e_machine) {
1059 case ELF::EM_X86_64:
1061 case ELF::R_X86_64_32S:
1064 case ELF::R_X86_64_PC32: {
1066 raw_string_ostream fmt(fmtbuf);
1067 fmt << symname << (addend < 0 ? "" : "+") << addend << "-P";
1069 Result.append(fmtbuf.begin(), fmtbuf.end());
1080 Result.append(res.begin(), res.end());
1081 return object_error::success;
1084 template<support::endianness target_endianness, bool is64Bits>
1085 ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object
1087 : ObjectFile(Binary::isELF, Object, ec)
1088 , SectionHeaderTable(0)
1089 , dot_shstrtab_sec(0)
1090 , dot_strtab_sec(0) {
1091 Header = reinterpret_cast<const Elf_Ehdr *>(base());
1093 if (Header->e_shoff == 0)
1096 SectionHeaderTable =
1097 reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff);
1098 uint64_t SectionTableSize = getNumSections() * Header->e_shentsize;
1099 if (!( (const uint8_t *)SectionHeaderTable + SectionTableSize
1100 <= base() + Data->getBufferSize()))
1101 // FIXME: Proper error handling.
1102 report_fatal_error("Section table goes past end of file!");
1105 // To find the symbol tables we walk the section table to find SHT_SYMTAB.
1106 const Elf_Shdr* SymbolTableSectionHeaderIndex = 0;
1107 const Elf_Shdr* sh = reinterpret_cast<const Elf_Shdr*>(SectionHeaderTable);
1108 for (uint64_t i = 0, e = getNumSections(); i != e; ++i) {
1109 if (sh->sh_type == ELF::SHT_SYMTAB_SHNDX) {
1110 if (SymbolTableSectionHeaderIndex)
1111 // FIXME: Proper error handling.
1112 report_fatal_error("More than one .symtab_shndx!");
1113 SymbolTableSectionHeaderIndex = sh;
1115 if (sh->sh_type == ELF::SHT_SYMTAB) {
1116 SymbolTableSectionsIndexMap[i] = SymbolTableSections.size();
1117 SymbolTableSections.push_back(sh);
1119 if (sh->sh_type == ELF::SHT_REL || sh->sh_type == ELF::SHT_RELA) {
1120 SectionRelocMap[getSection(sh->sh_link)].push_back(i);
1125 // Sort section relocation lists by index.
1126 for (typename RelocMap_t::iterator i = SectionRelocMap.begin(),
1127 e = SectionRelocMap.end(); i != e; ++i) {
1128 std::sort(i->second.begin(), i->second.end());
1131 // Get string table sections.
1132 dot_shstrtab_sec = getSection(getStringTableIndex());
1133 if (dot_shstrtab_sec) {
1134 // Verify that the last byte in the string table in a null.
1135 if (((const char*)base() + dot_shstrtab_sec->sh_offset)
1136 [dot_shstrtab_sec->sh_size - 1] != 0)
1137 // FIXME: Proper error handling.
1138 report_fatal_error("String table must end with a null terminator!");
1141 // Merge this into the above loop.
1142 for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable),
1143 *e = i + getNumSections() * Header->e_shentsize;
1144 i != e; i += Header->e_shentsize) {
1145 const Elf_Shdr *sh = reinterpret_cast<const Elf_Shdr*>(i);
1146 if (sh->sh_type == ELF::SHT_STRTAB) {
1147 StringRef SectionName(getString(dot_shstrtab_sec, sh->sh_name));
1148 if (SectionName == ".strtab") {
1149 if (dot_strtab_sec != 0)
1150 // FIXME: Proper error handling.
1151 report_fatal_error("Already found section named .strtab!");
1152 dot_strtab_sec = sh;
1153 const char *dot_strtab = (const char*)base() + sh->sh_offset;
1154 if (dot_strtab[sh->sh_size - 1] != 0)
1155 // FIXME: Proper error handling.
1156 report_fatal_error("String table must end with a null terminator!");
1161 // Build symbol name side-mapping if there is one.
1162 if (SymbolTableSectionHeaderIndex) {
1163 const Elf_Word *ShndxTable = reinterpret_cast<const Elf_Word*>(base() +
1164 SymbolTableSectionHeaderIndex->sh_offset);
1166 for (symbol_iterator si = begin_symbols(),
1167 se = end_symbols(); si != se; si.increment(ec)) {
1169 report_fatal_error("Fewer extended symbol table entries than symbols!");
1170 if (*ShndxTable != ELF::SHN_UNDEF)
1171 ExtendedSymbolTable[getSymbol(si->getRawDataRefImpl())] = *ShndxTable;
1177 template<support::endianness target_endianness, bool is64Bits>
1178 symbol_iterator ELFObjectFile<target_endianness, is64Bits>
1179 ::begin_symbols() const {
1180 DataRefImpl SymbolData;
1181 memset(&SymbolData, 0, sizeof(SymbolData));
1182 if (SymbolTableSections.size() == 0) {
1183 SymbolData.d.a = std::numeric_limits<uint32_t>::max();
1184 SymbolData.d.b = std::numeric_limits<uint32_t>::max();
1186 SymbolData.d.a = 1; // The 0th symbol in ELF is fake.
1189 return symbol_iterator(SymbolRef(SymbolData, this));
1192 template<support::endianness target_endianness, bool is64Bits>
1193 symbol_iterator ELFObjectFile<target_endianness, is64Bits>
1194 ::end_symbols() const {
1195 DataRefImpl SymbolData;
1196 memset(&SymbolData, 0, sizeof(SymbolData));
1197 SymbolData.d.a = std::numeric_limits<uint32_t>::max();
1198 SymbolData.d.b = std::numeric_limits<uint32_t>::max();
1199 return symbol_iterator(SymbolRef(SymbolData, this));
1202 template<support::endianness target_endianness, bool is64Bits>
1203 section_iterator ELFObjectFile<target_endianness, is64Bits>
1204 ::begin_sections() const {
1206 memset(&ret, 0, sizeof(DataRefImpl));
1207 ret.p = reinterpret_cast<intptr_t>(base() + Header->e_shoff);
1208 return section_iterator(SectionRef(ret, this));
1211 template<support::endianness target_endianness, bool is64Bits>
1212 section_iterator ELFObjectFile<target_endianness, is64Bits>
1213 ::end_sections() const {
1215 memset(&ret, 0, sizeof(DataRefImpl));
1216 ret.p = reinterpret_cast<intptr_t>(base()
1218 + (Header->e_shentsize*getNumSections()));
1219 return section_iterator(SectionRef(ret, this));
1222 template<support::endianness target_endianness, bool is64Bits>
1223 uint8_t ELFObjectFile<target_endianness, is64Bits>::getBytesInAddress() const {
1224 return is64Bits ? 8 : 4;
1227 template<support::endianness target_endianness, bool is64Bits>
1228 StringRef ELFObjectFile<target_endianness, is64Bits>
1229 ::getFileFormatName() const {
1230 switch(Header->e_ident[ELF::EI_CLASS]) {
1231 case ELF::ELFCLASS32:
1232 switch(Header->e_machine) {
1234 return "ELF32-i386";
1235 case ELF::EM_X86_64:
1236 return "ELF32-x86-64";
1240 return "ELF32-unknown";
1242 case ELF::ELFCLASS64:
1243 switch(Header->e_machine) {
1245 return "ELF64-i386";
1246 case ELF::EM_X86_64:
1247 return "ELF64-x86-64";
1249 return "ELF64-unknown";
1252 // FIXME: Proper error handling.
1253 report_fatal_error("Invalid ELFCLASS!");
1257 template<support::endianness target_endianness, bool is64Bits>
1258 unsigned ELFObjectFile<target_endianness, is64Bits>::getArch() const {
1259 switch(Header->e_machine) {
1262 case ELF::EM_X86_64:
1263 return Triple::x86_64;
1267 return Triple::UnknownArch;
1271 template<support::endianness target_endianness, bool is64Bits>
1272 uint64_t ELFObjectFile<target_endianness, is64Bits>::getNumSections() const {
1273 if (Header->e_shnum == ELF::SHN_UNDEF)
1274 return SectionHeaderTable->sh_size;
1275 return Header->e_shnum;
1278 template<support::endianness target_endianness, bool is64Bits>
1280 ELFObjectFile<target_endianness, is64Bits>::getStringTableIndex() const {
1281 if (Header->e_shnum == ELF::SHN_UNDEF) {
1282 if (Header->e_shstrndx == ELF::SHN_HIRESERVE)
1283 return SectionHeaderTable->sh_link;
1284 if (Header->e_shstrndx >= getNumSections())
1287 return Header->e_shstrndx;
1291 template<support::endianness target_endianness, bool is64Bits>
1292 template<typename T>
1294 ELFObjectFile<target_endianness, is64Bits>::getEntry(uint16_t Section,
1295 uint32_t Entry) const {
1296 return getEntry<T>(getSection(Section), Entry);
1299 template<support::endianness target_endianness, bool is64Bits>
1300 template<typename T>
1302 ELFObjectFile<target_endianness, is64Bits>::getEntry(const Elf_Shdr * Section,
1303 uint32_t Entry) const {
1304 return reinterpret_cast<const T *>(
1306 + Section->sh_offset
1307 + (Entry * Section->sh_entsize));
1310 template<support::endianness target_endianness, bool is64Bits>
1311 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Sym *
1312 ELFObjectFile<target_endianness, is64Bits>::getSymbol(DataRefImpl Symb) const {
1313 return getEntry<Elf_Sym>(SymbolTableSections[Symb.d.b], Symb.d.a);
1316 template<support::endianness target_endianness, bool is64Bits>
1317 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rel *
1318 ELFObjectFile<target_endianness, is64Bits>::getRel(DataRefImpl Rel) const {
1319 return getEntry<Elf_Rel>(Rel.w.b, Rel.w.c);
1322 template<support::endianness target_endianness, bool is64Bits>
1323 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rela *
1324 ELFObjectFile<target_endianness, is64Bits>::getRela(DataRefImpl Rela) const {
1325 return getEntry<Elf_Rela>(Rela.w.b, Rela.w.c);
1328 template<support::endianness target_endianness, bool is64Bits>
1329 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
1330 ELFObjectFile<target_endianness, is64Bits>::getSection(DataRefImpl Symb) const {
1331 const Elf_Shdr *sec = getSection(Symb.d.b);
1332 if (sec->sh_type != ELF::SHT_SYMTAB || sec->sh_type != ELF::SHT_DYNSYM)
1333 // FIXME: Proper error handling.
1334 report_fatal_error("Invalid symbol table section!");
1338 template<support::endianness target_endianness, bool is64Bits>
1339 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
1340 ELFObjectFile<target_endianness, is64Bits>::getSection(uint32_t index) const {
1343 if (!SectionHeaderTable || index >= getNumSections())
1344 // FIXME: Proper error handling.
1345 report_fatal_error("Invalid section index!");
1347 return reinterpret_cast<const Elf_Shdr *>(
1348 reinterpret_cast<const char *>(SectionHeaderTable)
1349 + (index * Header->e_shentsize));
1352 template<support::endianness target_endianness, bool is64Bits>
1353 const char *ELFObjectFile<target_endianness, is64Bits>
1354 ::getString(uint32_t section,
1355 ELF::Elf32_Word offset) const {
1356 return getString(getSection(section), offset);
1359 template<support::endianness target_endianness, bool is64Bits>
1360 const char *ELFObjectFile<target_endianness, is64Bits>
1361 ::getString(const Elf_Shdr *section,
1362 ELF::Elf32_Word offset) const {
1363 assert(section && section->sh_type == ELF::SHT_STRTAB && "Invalid section!");
1364 if (offset >= section->sh_size)
1365 // FIXME: Proper error handling.
1366 report_fatal_error("Symbol name offset outside of string table!");
1367 return (const char *)base() + section->sh_offset + offset;
1370 template<support::endianness target_endianness, bool is64Bits>
1371 error_code ELFObjectFile<target_endianness, is64Bits>
1372 ::getSymbolName(const Elf_Sym *symb,
1373 StringRef &Result) const {
1374 if (symb->st_name == 0) {
1375 const Elf_Shdr *section = getSection(symb);
1379 Result = getString(dot_shstrtab_sec, section->sh_name);
1380 return object_error::success;
1383 // Use the default symbol table name section.
1384 Result = getString(dot_strtab_sec, symb->st_name);
1385 return object_error::success;
1388 // EI_CLASS, EI_DATA.
1389 static std::pair<unsigned char, unsigned char>
1390 getElfArchType(MemoryBuffer *Object) {
1391 if (Object->getBufferSize() < ELF::EI_NIDENT)
1392 return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE);
1393 return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS]
1394 , (uint8_t)Object->getBufferStart()[ELF::EI_DATA]);
1399 ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) {
1400 std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object);
1402 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
1403 return new ELFObjectFile<support::little, false>(Object, ec);
1404 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
1405 return new ELFObjectFile<support::big, false>(Object, ec);
1406 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB)
1407 return new ELFObjectFile<support::little, true>(Object, ec);
1408 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
1409 return new ELFObjectFile<support::big, true>(Object, ec);
1410 // FIXME: Proper error handling.
1411 report_fatal_error("Not an ELF object file!");
1414 } // end namespace llvm