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(uint16_t index) const;
319 const Elf_Rel *getRel(DataRefImpl Rel) const;
320 const Elf_Rela *getRela(DataRefImpl Rela) const;
321 const char *getString(uint16_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 getSymbolTableIndex(const Elf_Sym *symb) const;
380 template<support::endianness target_endianness, bool is64Bits>
381 void ELFObjectFile<target_endianness, is64Bits>
382 ::validateSymbol(DataRefImpl Symb) const {
383 const Elf_Sym *symb = getSymbol(Symb);
384 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b];
385 // FIXME: We really need to do proper error handling in the case of an invalid
386 // input file. Because we don't use exceptions, I think we'll just pass
387 // an error object around.
389 && SymbolTableSection
390 && symb >= (const Elf_Sym*)(base()
391 + SymbolTableSection->sh_offset)
392 && symb < (const Elf_Sym*)(base()
393 + SymbolTableSection->sh_offset
394 + SymbolTableSection->sh_size)))
395 // FIXME: Proper error handling.
396 report_fatal_error("Symb must point to a valid symbol!");
399 template<support::endianness target_endianness, bool is64Bits>
400 error_code ELFObjectFile<target_endianness, is64Bits>
401 ::getSymbolNext(DataRefImpl Symb,
402 SymbolRef &Result) const {
403 validateSymbol(Symb);
404 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b];
407 // Check to see if we are at the end of this symbol table.
408 if (Symb.d.a >= SymbolTableSection->getEntityCount()) {
409 // We are at the end. If there are other symbol tables, jump to them.
411 Symb.d.a = 1; // The 0th symbol in ELF is fake.
412 // Otherwise return the terminator.
413 if (Symb.d.b >= SymbolTableSections.size()) {
414 Symb.d.a = std::numeric_limits<uint32_t>::max();
415 Symb.d.b = std::numeric_limits<uint32_t>::max();
419 Result = SymbolRef(Symb, this);
420 return object_error::success;
423 template<support::endianness target_endianness, bool is64Bits>
424 error_code ELFObjectFile<target_endianness, is64Bits>
425 ::getSymbolName(DataRefImpl Symb,
426 StringRef &Result) const {
427 validateSymbol(Symb);
428 const Elf_Sym *symb = getSymbol(Symb);
429 return getSymbolName(symb, Result);
432 template<support::endianness target_endianness, bool is64Bits>
433 uint64_t ELFObjectFile<target_endianness, is64Bits>
434 ::getSymbolTableIndex(const Elf_Sym *symb) const {
435 if (symb->st_shndx == ELF::SHN_XINDEX)
436 return ExtendedSymbolTable.lookup(symb);
437 return symb->st_shndx;
440 template<support::endianness target_endianness, bool is64Bits>
441 error_code ELFObjectFile<target_endianness, is64Bits>
442 ::getSymbolOffset(DataRefImpl Symb,
443 uint64_t &Result) const {
444 validateSymbol(Symb);
445 const Elf_Sym *symb = getSymbol(Symb);
446 const Elf_Shdr *Section;
447 switch (getSymbolTableIndex(symb)) {
448 case ELF::SHN_COMMON:
449 // Undefined symbols have no address yet.
451 Result = UnknownAddressOrSize;
452 return object_error::success;
454 Result = symb->st_value;
455 return object_error::success;
456 default: Section = getSection(symb->st_shndx);
459 switch (symb->getType()) {
460 case ELF::STT_SECTION:
461 Result = Section ? Section->sh_addr : UnknownAddressOrSize;
462 return object_error::success;
464 case ELF::STT_OBJECT:
465 case ELF::STT_NOTYPE:
466 Result = symb->st_value;
467 return object_error::success;
469 Result = UnknownAddressOrSize;
470 return object_error::success;
474 template<support::endianness target_endianness, bool is64Bits>
475 error_code ELFObjectFile<target_endianness, is64Bits>
476 ::getSymbolAddress(DataRefImpl Symb,
477 uint64_t &Result) const {
478 validateSymbol(Symb);
479 const Elf_Sym *symb = getSymbol(Symb);
480 const Elf_Shdr *Section;
481 switch (getSymbolTableIndex(symb)) {
482 case ELF::SHN_COMMON: // Fall through.
483 // Undefined symbols have no address yet.
485 Result = UnknownAddressOrSize;
486 return object_error::success;
488 Result = reinterpret_cast<uintptr_t>(base()+symb->st_value);
489 return object_error::success;
490 default: Section = getSection(getSymbolTableIndex(symb));
492 const uint8_t* addr = base();
494 addr += Section->sh_offset;
495 switch (symb->getType()) {
496 case ELF::STT_SECTION:
497 Result = reinterpret_cast<uintptr_t>(addr);
498 return object_error::success;
499 case ELF::STT_FUNC: // Fall through.
500 case ELF::STT_OBJECT: // Fall through.
501 case ELF::STT_NOTYPE:
502 addr += symb->st_value;
503 Result = reinterpret_cast<uintptr_t>(addr);
504 return object_error::success;
506 Result = UnknownAddressOrSize;
507 return object_error::success;
511 template<support::endianness target_endianness, bool is64Bits>
512 error_code ELFObjectFile<target_endianness, is64Bits>
513 ::getSymbolSize(DataRefImpl Symb,
514 uint64_t &Result) const {
515 validateSymbol(Symb);
516 const Elf_Sym *symb = getSymbol(Symb);
517 if (symb->st_size == 0)
518 Result = UnknownAddressOrSize;
519 Result = symb->st_size;
520 return object_error::success;
523 template<support::endianness target_endianness, bool is64Bits>
524 error_code ELFObjectFile<target_endianness, is64Bits>
525 ::getSymbolNMTypeChar(DataRefImpl Symb,
526 char &Result) const {
527 validateSymbol(Symb);
528 const Elf_Sym *symb = getSymbol(Symb);
529 const Elf_Shdr *Section = getSection(getSymbolTableIndex(symb));
534 switch (Section->sh_type) {
535 case ELF::SHT_PROGBITS:
536 case ELF::SHT_DYNAMIC:
537 switch (Section->sh_flags) {
538 case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR):
540 case (ELF::SHF_ALLOC | ELF::SHF_WRITE):
543 case (ELF::SHF_ALLOC | ELF::SHF_MERGE):
544 case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS):
548 case ELF::SHT_NOBITS: ret = 'b';
552 switch (symb->st_shndx) {
557 case ELF::SHN_ABS: ret = 'a'; break;
558 case ELF::SHN_COMMON: ret = 'c'; break;
561 switch (symb->getBinding()) {
562 case ELF::STB_GLOBAL: ret = ::toupper(ret); break;
564 if (symb->st_shndx == ELF::SHN_UNDEF)
567 if (symb->getType() == ELF::STT_OBJECT)
573 if (ret == '?' && symb->getType() == ELF::STT_SECTION) {
575 if (error_code ec = getSymbolName(Symb, name))
577 Result = StringSwitch<char>(name)
578 .StartsWith(".debug", 'N')
579 .StartsWith(".note", 'n')
581 return object_error::success;
585 return object_error::success;
588 template<support::endianness target_endianness, bool is64Bits>
589 error_code ELFObjectFile<target_endianness, is64Bits>
590 ::getSymbolType(DataRefImpl Symb,
591 SymbolRef::SymbolType &Result) const {
592 validateSymbol(Symb);
593 const Elf_Sym *symb = getSymbol(Symb);
595 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) {
596 Result = SymbolRef::ST_External;
597 return object_error::success;
600 switch (symb->getType()) {
602 Result = SymbolRef::ST_Function;
604 case ELF::STT_OBJECT:
605 Result = SymbolRef::ST_Data;
608 Result = SymbolRef::ST_Other;
611 return object_error::success;
614 template<support::endianness target_endianness, bool is64Bits>
615 error_code ELFObjectFile<target_endianness, is64Bits>
616 ::isSymbolGlobal(DataRefImpl Symb,
617 bool &Result) const {
618 validateSymbol(Symb);
619 const Elf_Sym *symb = getSymbol(Symb);
621 Result = symb->getBinding() == ELF::STB_GLOBAL;
622 return object_error::success;
625 template<support::endianness target_endianness, bool is64Bits>
626 error_code ELFObjectFile<target_endianness, is64Bits>
627 ::isSymbolInternal(DataRefImpl Symb,
628 bool &Result) const {
629 validateSymbol(Symb);
630 const Elf_Sym *symb = getSymbol(Symb);
632 if ( symb->getType() == ELF::STT_FILE
633 || symb->getType() == ELF::STT_SECTION)
636 return object_error::success;
639 template<support::endianness target_endianness, bool is64Bits>
640 error_code ELFObjectFile<target_endianness, is64Bits>
641 ::getSectionNext(DataRefImpl Sec, SectionRef &Result) const {
642 const uint8_t *sec = reinterpret_cast<const uint8_t *>(Sec.p);
643 sec += Header->e_shentsize;
644 Sec.p = reinterpret_cast<intptr_t>(sec);
645 Result = SectionRef(Sec, this);
646 return object_error::success;
649 template<support::endianness target_endianness, bool is64Bits>
650 error_code ELFObjectFile<target_endianness, is64Bits>
651 ::getSectionName(DataRefImpl Sec,
652 StringRef &Result) const {
653 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
654 Result = StringRef(getString(dot_shstrtab_sec, sec->sh_name));
655 return object_error::success;
658 template<support::endianness target_endianness, bool is64Bits>
659 error_code ELFObjectFile<target_endianness, is64Bits>
660 ::getSectionAddress(DataRefImpl Sec,
661 uint64_t &Result) const {
662 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
663 Result = sec->sh_addr;
664 return object_error::success;
667 template<support::endianness target_endianness, bool is64Bits>
668 error_code ELFObjectFile<target_endianness, is64Bits>
669 ::getSectionSize(DataRefImpl Sec,
670 uint64_t &Result) const {
671 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
672 Result = sec->sh_size;
673 return object_error::success;
676 template<support::endianness target_endianness, bool is64Bits>
677 error_code ELFObjectFile<target_endianness, is64Bits>
678 ::getSectionContents(DataRefImpl Sec,
679 StringRef &Result) const {
680 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
681 const char *start = (const char*)base() + sec->sh_offset;
682 Result = StringRef(start, sec->sh_size);
683 return object_error::success;
686 template<support::endianness target_endianness, bool is64Bits>
687 error_code ELFObjectFile<target_endianness, is64Bits>
688 ::getSectionAlignment(DataRefImpl Sec,
689 uint64_t &Result) const {
690 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
691 Result = sec->sh_addralign;
692 return object_error::success;
695 template<support::endianness target_endianness, bool is64Bits>
696 error_code ELFObjectFile<target_endianness, is64Bits>
697 ::isSectionText(DataRefImpl Sec,
698 bool &Result) const {
699 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
700 if (sec->sh_flags & ELF::SHF_EXECINSTR)
704 return object_error::success;
707 template<support::endianness target_endianness, bool is64Bits>
708 error_code ELFObjectFile<target_endianness, is64Bits>
709 ::isSectionData(DataRefImpl Sec,
710 bool &Result) const {
711 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
712 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE)
713 && sec->sh_type == ELF::SHT_PROGBITS)
717 return object_error::success;
720 template<support::endianness target_endianness, bool is64Bits>
721 error_code ELFObjectFile<target_endianness, is64Bits>
722 ::isSectionBSS(DataRefImpl Sec,
723 bool &Result) const {
724 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
725 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE)
726 && sec->sh_type == ELF::SHT_NOBITS)
730 return object_error::success;
733 template<support::endianness target_endianness, bool is64Bits>
734 error_code ELFObjectFile<target_endianness, is64Bits>
735 ::sectionContainsSymbol(DataRefImpl Sec,
737 bool &Result) const {
738 // FIXME: Unimplemented.
740 return object_error::success;
743 template<support::endianness target_endianness, bool is64Bits>
744 relocation_iterator ELFObjectFile<target_endianness, is64Bits>
745 ::getSectionRelBegin(DataRefImpl Sec) const {
747 memset(&RelData, 0, sizeof(RelData));
748 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
749 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec);
750 if (sec != 0 && ittr != SectionRelocMap.end()) {
751 RelData.w.a = getSection(ittr->second[0])->sh_link;
752 RelData.w.b = ittr->second[0];
755 return relocation_iterator(RelocationRef(RelData, this));
758 template<support::endianness target_endianness, bool is64Bits>
759 relocation_iterator ELFObjectFile<target_endianness, is64Bits>
760 ::getSectionRelEnd(DataRefImpl Sec) const {
762 memset(&RelData, 0, sizeof(RelData));
763 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
764 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec);
765 if (sec != 0 && ittr != SectionRelocMap.end()) {
766 // Get the index of the last relocation section for this section.
767 std::size_t relocsecindex = ittr->second[ittr->second.size() - 1];
768 const Elf_Shdr *relocsec = getSection(relocsecindex);
769 RelData.w.a = relocsec->sh_link;
770 RelData.w.b = relocsecindex;
771 RelData.w.c = relocsec->sh_size / relocsec->sh_entsize;
773 return relocation_iterator(RelocationRef(RelData, this));
777 template<support::endianness target_endianness, bool is64Bits>
778 error_code ELFObjectFile<target_endianness, is64Bits>
779 ::getRelocationNext(DataRefImpl Rel,
780 RelocationRef &Result) const {
782 const Elf_Shdr *relocsec = getSection(Rel.w.b);
783 if (Rel.w.c >= (relocsec->sh_size / relocsec->sh_entsize)) {
784 // We have reached the end of the relocations for this section. See if there
785 // is another relocation section.
786 typename RelocMap_t::mapped_type relocseclist =
787 SectionRelocMap.lookup(getSection(Rel.w.a));
789 // Do a binary search for the current reloc section index (which must be
790 // present). Then get the next one.
791 typename RelocMap_t::mapped_type::const_iterator loc =
792 std::lower_bound(relocseclist.begin(), relocseclist.end(), Rel.w.b);
795 // If there is no next one, don't do anything. The ++Rel.w.c above sets Rel
796 // to the end iterator.
797 if (loc != relocseclist.end()) {
802 Result = RelocationRef(Rel, this);
803 return object_error::success;
806 template<support::endianness target_endianness, bool is64Bits>
807 error_code ELFObjectFile<target_endianness, is64Bits>
808 ::getRelocationSymbol(DataRefImpl Rel,
809 SymbolRef &Result) const {
811 const Elf_Shdr *sec = getSection(Rel.w.b);
812 switch (sec->sh_type) {
814 report_fatal_error("Invalid section type in Rel!");
815 case ELF::SHT_REL : {
816 symbolIdx = getRel(Rel)->getSymbol();
819 case ELF::SHT_RELA : {
820 symbolIdx = getRela(Rel)->getSymbol();
824 DataRefImpl SymbolData;
825 IndexMap_t::const_iterator it = SymbolTableSectionsIndexMap.find(sec->sh_link);
826 if (it == SymbolTableSectionsIndexMap.end())
827 report_fatal_error("Relocation symbol table not found!");
828 SymbolData.d.a = symbolIdx;
829 SymbolData.d.b = it->second;
830 Result = SymbolRef(SymbolData, this);
831 return object_error::success;
834 template<support::endianness target_endianness, bool is64Bits>
835 error_code ELFObjectFile<target_endianness, is64Bits>
836 ::getRelocationAddress(DataRefImpl Rel,
837 uint64_t &Result) const {
839 const Elf_Shdr *sec = getSection(Rel.w.b);
840 switch (sec->sh_type) {
842 report_fatal_error("Invalid section type in Rel!");
843 case ELF::SHT_REL : {
844 offset = getRel(Rel)->r_offset;
847 case ELF::SHT_RELA : {
848 offset = getRela(Rel)->r_offset;
854 return object_error::success;
857 template<support::endianness target_endianness, bool is64Bits>
858 error_code ELFObjectFile<target_endianness, is64Bits>
859 ::getRelocationType(DataRefImpl Rel,
860 uint32_t &Result) const {
861 const Elf_Shdr *sec = getSection(Rel.w.b);
862 switch (sec->sh_type) {
864 report_fatal_error("Invalid section type in Rel!");
865 case ELF::SHT_REL : {
866 Result = getRel(Rel)->getType();
869 case ELF::SHT_RELA : {
870 Result = getRela(Rel)->getType();
874 return object_error::success;
877 #define LLVM_ELF_SWITCH_RELOC_TYPE_NAME(enum) \
878 case ELF::enum: res = #enum; break;
880 template<support::endianness target_endianness, bool is64Bits>
881 error_code ELFObjectFile<target_endianness, is64Bits>
882 ::getRelocationTypeName(DataRefImpl Rel,
883 SmallVectorImpl<char> &Result) const {
884 const Elf_Shdr *sec = getSection(Rel.w.b);
887 switch (sec->sh_type) {
889 return object_error::parse_failed;
890 case ELF::SHT_REL : {
891 type = getRel(Rel)->getType();
894 case ELF::SHT_RELA : {
895 type = getRela(Rel)->getType();
899 switch (Header->e_machine) {
902 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_NONE);
903 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_64);
904 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC32);
905 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOT32);
906 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PLT32);
907 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_COPY);
908 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GLOB_DAT);
909 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_JUMP_SLOT);
910 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_RELATIVE);
911 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPCREL);
912 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32);
913 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32S);
914 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_16);
915 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC16);
916 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_8);
917 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC8);
918 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPMOD64);
919 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF64);
920 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF64);
921 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSGD);
922 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSLD);
923 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF32);
924 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTTPOFF);
925 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF32);
926 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC64);
927 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTOFF64);
928 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32);
929 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE32);
930 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE64);
931 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32_TLSDESC);
932 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC_CALL);
933 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC);
940 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_NONE);
941 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32);
942 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC32);
943 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOT32);
944 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PLT32);
945 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_COPY);
946 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GLOB_DAT);
947 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_JUMP_SLOT);
948 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_RELATIVE);
949 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTOFF);
950 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTPC);
951 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32PLT);
952 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF);
953 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE);
954 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTIE);
955 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE);
956 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD);
957 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM);
958 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_16);
959 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC16);
960 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_8);
961 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC8);
962 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_32);
963 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_PUSH);
964 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_CALL);
965 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_POP);
966 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_32);
967 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_PUSH);
968 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_CALL);
969 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_POP);
970 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDO_32);
971 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE_32);
972 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE_32);
973 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPMOD32);
974 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPOFF32);
975 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF32);
976 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTDESC);
977 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC_CALL);
978 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC);
979 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_IRELATIVE);
987 Result.append(res.begin(), res.end());
988 return object_error::success;
991 #undef LLVM_ELF_SWITCH_RELOC_TYPE_NAME
993 template<support::endianness target_endianness, bool is64Bits>
994 error_code ELFObjectFile<target_endianness, is64Bits>
995 ::getRelocationAdditionalInfo(DataRefImpl Rel,
996 int64_t &Result) const {
997 const Elf_Shdr *sec = getSection(Rel.w.b);
998 switch (sec->sh_type) {
1000 report_fatal_error("Invalid section type in Rel!");
1001 case ELF::SHT_REL : {
1003 return object_error::success;
1005 case ELF::SHT_RELA : {
1006 Result = getRela(Rel)->r_addend;
1007 return object_error::success;
1012 template<support::endianness target_endianness, bool is64Bits>
1013 error_code ELFObjectFile<target_endianness, is64Bits>
1014 ::getRelocationValueString(DataRefImpl Rel,
1015 SmallVectorImpl<char> &Result) const {
1016 const Elf_Shdr *sec = getSection(Rel.w.b);
1020 uint16_t symbol_index = 0;
1021 switch (sec->sh_type) {
1023 return object_error::parse_failed;
1024 case ELF::SHT_REL : {
1025 type = getRel(Rel)->getType();
1026 symbol_index = getRel(Rel)->getSymbol();
1027 // TODO: Read implicit addend from section data.
1030 case ELF::SHT_RELA : {
1031 type = getRela(Rel)->getType();
1032 symbol_index = getRela(Rel)->getSymbol();
1033 addend = getRela(Rel)->r_addend;
1037 const Elf_Sym *symb = getEntry<Elf_Sym>(sec->sh_link, symbol_index);
1039 if (error_code ec = getSymbolName(symb, symname))
1041 switch (Header->e_machine) {
1042 case ELF::EM_X86_64:
1044 case ELF::R_X86_64_32S:
1047 case ELF::R_X86_64_PC32: {
1049 raw_string_ostream fmt(fmtbuf);
1050 fmt << symname << (addend < 0 ? "" : "+") << addend << "-P";
1052 Result.append(fmtbuf.begin(), fmtbuf.end());
1063 Result.append(res.begin(), res.end());
1064 return object_error::success;
1067 template<support::endianness target_endianness, bool is64Bits>
1068 ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object
1070 : ObjectFile(Binary::isELF, Object, ec)
1071 , SectionHeaderTable(0)
1072 , dot_shstrtab_sec(0)
1073 , dot_strtab_sec(0) {
1074 Header = reinterpret_cast<const Elf_Ehdr *>(base());
1076 if (Header->e_shoff == 0)
1079 SectionHeaderTable =
1080 reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff);
1081 uint32_t SectionTableSize = Header->e_shnum * Header->e_shentsize;
1082 if (!( (const uint8_t *)SectionHeaderTable + SectionTableSize
1083 <= base() + Data->getBufferSize()))
1084 // FIXME: Proper error handling.
1085 report_fatal_error("Section table goes past end of file!");
1088 // To find the symbol tables we walk the section table to find SHT_SYMTAB.
1089 const Elf_Shdr* SymbolTableSectionHeaderIndex = 0;
1090 const Elf_Shdr* sh = reinterpret_cast<const Elf_Shdr*>(SectionHeaderTable);
1091 for (unsigned i = 0; i < Header->e_shnum; ++i) {
1092 if (sh->sh_type == ELF::SHT_SYMTAB_SHNDX) {
1093 if (SymbolTableSectionHeaderIndex)
1094 // FIXME: Proper error handling.
1095 report_fatal_error("More than one .symtab_shndx!");
1096 SymbolTableSectionHeaderIndex = sh;
1098 if (sh->sh_type == ELF::SHT_SYMTAB) {
1099 SymbolTableSectionsIndexMap[i] = SymbolTableSections.size();
1100 SymbolTableSections.push_back(sh);
1102 if (sh->sh_type == ELF::SHT_REL || sh->sh_type == ELF::SHT_RELA) {
1103 SectionRelocMap[getSection(sh->sh_link)].push_back(i);
1108 // Sort section relocation lists by index.
1109 for (typename RelocMap_t::iterator i = SectionRelocMap.begin(),
1110 e = SectionRelocMap.end(); i != e; ++i) {
1111 std::sort(i->second.begin(), i->second.end());
1114 // Get string table sections.
1115 dot_shstrtab_sec = getSection(Header->e_shstrndx);
1116 if (dot_shstrtab_sec) {
1117 // Verify that the last byte in the string table in a null.
1118 if (((const char*)base() + dot_shstrtab_sec->sh_offset)
1119 [dot_shstrtab_sec->sh_size - 1] != 0)
1120 // FIXME: Proper error handling.
1121 report_fatal_error("String table must end with a null terminator!");
1124 // Merge this into the above loop.
1125 for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable),
1126 *e = i + Header->e_shnum * Header->e_shentsize;
1127 i != e; i += Header->e_shentsize) {
1128 const Elf_Shdr *sh = reinterpret_cast<const Elf_Shdr*>(i);
1129 if (sh->sh_type == ELF::SHT_STRTAB) {
1130 StringRef SectionName(getString(dot_shstrtab_sec, sh->sh_name));
1131 if (SectionName == ".strtab") {
1132 if (dot_strtab_sec != 0)
1133 // FIXME: Proper error handling.
1134 report_fatal_error("Already found section named .strtab!");
1135 dot_strtab_sec = sh;
1136 const char *dot_strtab = (const char*)base() + sh->sh_offset;
1137 if (dot_strtab[sh->sh_size - 1] != 0)
1138 // FIXME: Proper error handling.
1139 report_fatal_error("String table must end with a null terminator!");
1144 // Build symbol name side-mapping if there is one.
1145 if (SymbolTableSectionHeaderIndex) {
1146 const Elf_Word *ShndxTable = reinterpret_cast<const Elf_Word*>(base() +
1147 SymbolTableSectionHeaderIndex->sh_offset);
1149 for (symbol_iterator si = begin_symbols(),
1150 se = end_symbols(); si != se; si.increment(ec)) {
1152 report_fatal_error("Fewer extended symbol table entries than symbols!");
1153 if (*ShndxTable != ELF::SHN_UNDEF)
1154 ExtendedSymbolTable[getSymbol(si->getRawDataRefImpl())] = *ShndxTable;
1160 template<support::endianness target_endianness, bool is64Bits>
1161 symbol_iterator ELFObjectFile<target_endianness, is64Bits>
1162 ::begin_symbols() const {
1163 DataRefImpl SymbolData;
1164 memset(&SymbolData, 0, sizeof(SymbolData));
1165 if (SymbolTableSections.size() == 0) {
1166 SymbolData.d.a = std::numeric_limits<uint32_t>::max();
1167 SymbolData.d.b = std::numeric_limits<uint32_t>::max();
1169 SymbolData.d.a = 1; // The 0th symbol in ELF is fake.
1172 return symbol_iterator(SymbolRef(SymbolData, this));
1175 template<support::endianness target_endianness, bool is64Bits>
1176 symbol_iterator ELFObjectFile<target_endianness, is64Bits>
1177 ::end_symbols() const {
1178 DataRefImpl SymbolData;
1179 memset(&SymbolData, 0, sizeof(SymbolData));
1180 SymbolData.d.a = std::numeric_limits<uint32_t>::max();
1181 SymbolData.d.b = std::numeric_limits<uint32_t>::max();
1182 return symbol_iterator(SymbolRef(SymbolData, this));
1185 template<support::endianness target_endianness, bool is64Bits>
1186 section_iterator ELFObjectFile<target_endianness, is64Bits>
1187 ::begin_sections() const {
1189 memset(&ret, 0, sizeof(DataRefImpl));
1190 ret.p = reinterpret_cast<intptr_t>(base() + Header->e_shoff);
1191 return section_iterator(SectionRef(ret, this));
1194 template<support::endianness target_endianness, bool is64Bits>
1195 section_iterator ELFObjectFile<target_endianness, is64Bits>
1196 ::end_sections() const {
1198 memset(&ret, 0, sizeof(DataRefImpl));
1199 ret.p = reinterpret_cast<intptr_t>(base()
1201 + (Header->e_shentsize * Header->e_shnum));
1202 return section_iterator(SectionRef(ret, this));
1205 template<support::endianness target_endianness, bool is64Bits>
1206 uint8_t ELFObjectFile<target_endianness, is64Bits>::getBytesInAddress() const {
1207 return is64Bits ? 8 : 4;
1210 template<support::endianness target_endianness, bool is64Bits>
1211 StringRef ELFObjectFile<target_endianness, is64Bits>
1212 ::getFileFormatName() const {
1213 switch(Header->e_ident[ELF::EI_CLASS]) {
1214 case ELF::ELFCLASS32:
1215 switch(Header->e_machine) {
1217 return "ELF32-i386";
1218 case ELF::EM_X86_64:
1219 return "ELF32-x86-64";
1223 return "ELF32-unknown";
1225 case ELF::ELFCLASS64:
1226 switch(Header->e_machine) {
1228 return "ELF64-i386";
1229 case ELF::EM_X86_64:
1230 return "ELF64-x86-64";
1232 return "ELF64-unknown";
1235 // FIXME: Proper error handling.
1236 report_fatal_error("Invalid ELFCLASS!");
1240 template<support::endianness target_endianness, bool is64Bits>
1241 unsigned ELFObjectFile<target_endianness, is64Bits>::getArch() const {
1242 switch(Header->e_machine) {
1245 case ELF::EM_X86_64:
1246 return Triple::x86_64;
1250 return Triple::UnknownArch;
1255 template<support::endianness target_endianness, bool is64Bits>
1256 template<typename T>
1258 ELFObjectFile<target_endianness, is64Bits>::getEntry(uint16_t Section,
1259 uint32_t Entry) const {
1260 return getEntry<T>(getSection(Section), Entry);
1263 template<support::endianness target_endianness, bool is64Bits>
1264 template<typename T>
1266 ELFObjectFile<target_endianness, is64Bits>::getEntry(const Elf_Shdr * Section,
1267 uint32_t Entry) const {
1268 return reinterpret_cast<const T *>(
1270 + Section->sh_offset
1271 + (Entry * Section->sh_entsize));
1274 template<support::endianness target_endianness, bool is64Bits>
1275 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Sym *
1276 ELFObjectFile<target_endianness, is64Bits>::getSymbol(DataRefImpl Symb) const {
1277 return getEntry<Elf_Sym>(SymbolTableSections[Symb.d.b], Symb.d.a);
1280 template<support::endianness target_endianness, bool is64Bits>
1281 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rel *
1282 ELFObjectFile<target_endianness, is64Bits>::getRel(DataRefImpl Rel) const {
1283 return getEntry<Elf_Rel>(Rel.w.b, Rel.w.c);
1286 template<support::endianness target_endianness, bool is64Bits>
1287 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rela *
1288 ELFObjectFile<target_endianness, is64Bits>::getRela(DataRefImpl Rela) const {
1289 return getEntry<Elf_Rela>(Rela.w.b, Rela.w.c);
1292 template<support::endianness target_endianness, bool is64Bits>
1293 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
1294 ELFObjectFile<target_endianness, is64Bits>::getSection(DataRefImpl Symb) const {
1295 const Elf_Shdr *sec = getSection(Symb.d.b);
1296 if (sec->sh_type != ELF::SHT_SYMTAB || sec->sh_type != ELF::SHT_DYNSYM)
1297 // FIXME: Proper error handling.
1298 report_fatal_error("Invalid symbol table section!");
1302 template<support::endianness target_endianness, bool is64Bits>
1303 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
1304 ELFObjectFile<target_endianness, is64Bits>::getSection(uint16_t index) const {
1305 if (index == 0 || index >= ELF::SHN_LORESERVE)
1307 if (!SectionHeaderTable || index >= Header->e_shnum)
1308 // FIXME: Proper error handling.
1309 report_fatal_error("Invalid section index!");
1311 return reinterpret_cast<const Elf_Shdr *>(
1312 reinterpret_cast<const char *>(SectionHeaderTable)
1313 + (index * Header->e_shentsize));
1316 template<support::endianness target_endianness, bool is64Bits>
1317 const char *ELFObjectFile<target_endianness, is64Bits>
1318 ::getString(uint16_t section,
1319 ELF::Elf32_Word offset) const {
1320 return getString(getSection(section), offset);
1323 template<support::endianness target_endianness, bool is64Bits>
1324 const char *ELFObjectFile<target_endianness, is64Bits>
1325 ::getString(const Elf_Shdr *section,
1326 ELF::Elf32_Word offset) const {
1327 assert(section && section->sh_type == ELF::SHT_STRTAB && "Invalid section!");
1328 if (offset >= section->sh_size)
1329 // FIXME: Proper error handling.
1330 report_fatal_error("Symbol name offset outside of string table!");
1331 return (const char *)base() + section->sh_offset + offset;
1334 template<support::endianness target_endianness, bool is64Bits>
1335 error_code ELFObjectFile<target_endianness, is64Bits>
1336 ::getSymbolName(const Elf_Sym *symb,
1337 StringRef &Result) const {
1338 if (symb->st_name == 0) {
1339 const Elf_Shdr *section = getSection(getSymbolTableIndex(symb));
1343 Result = getString(dot_shstrtab_sec, section->sh_name);
1344 return object_error::success;
1347 // Use the default symbol table name section.
1348 Result = getString(dot_strtab_sec, symb->st_name);
1349 return object_error::success;
1352 // EI_CLASS, EI_DATA.
1353 static std::pair<unsigned char, unsigned char>
1354 getElfArchType(MemoryBuffer *Object) {
1355 if (Object->getBufferSize() < ELF::EI_NIDENT)
1356 return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE);
1357 return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS]
1358 , (uint8_t)Object->getBufferStart()[ELF::EI_DATA]);
1363 ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) {
1364 std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object);
1366 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
1367 return new ELFObjectFile<support::little, false>(Object, ec);
1368 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
1369 return new ELFObjectFile<support::big, false>(Object, ec);
1370 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB)
1371 return new ELFObjectFile<support::little, true>(Object, ec);
1372 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
1373 return new ELFObjectFile<support::big, true>(Object, ec);
1374 // FIXME: Proper error handling.
1375 report_fatal_error("Not an ELF object file!");
1378 } // end namespace llvm