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Add support for reading many-section ELF files.

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If you want to tackle adding the testcase, let me know. It's a 4.2MB ELF file
and I'll be happy to mail it to you.

llvm-svn: 141605
This commit is contained in:
Nick Lewycky 2011-10-11 00:15:42 +00:00
parent ac95006d45
commit bf9a3771b7
1 changed files with 34 additions and 13 deletions
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47
lib/Object/ELFObjectFile.cpp
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@ -314,10 +314,10 @@ class ELFObjectFile : public ObjectFile {
const T *getEntry(const Elf_Shdr *Section, uint32_t Entry) const;
const Elf_Sym *getSymbol(DataRefImpl Symb) const;
const Elf_Shdr *getSection(DataRefImpl index) const;
const Elf_Shdr *getSection(uint16_t index) const;
const Elf_Shdr *getSection(uint32_t index) const;
const Elf_Rel *getRel(DataRefImpl Rel) const;
const Elf_Rela *getRela(DataRefImpl Rela) const;
const char *getString(uint16_t section, uint32_t offset) const;
const char *getString(uint32_t section, uint32_t offset) const;
const char *getString(const Elf_Shdr *section, uint32_t offset) const;
error_code getSymbolName(const Elf_Sym *Symb, StringRef &Res) const;
@ -371,6 +371,9 @@ public:
virtual uint8_t getBytesInAddress() const;
virtual StringRef getFileFormatName() const;
virtual unsigned getArch() const;
uint64_t getNumSections() const;
uint64_t getStringTableIndex() const;
};
} // end namespace
@ -1067,16 +1070,15 @@ ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object
SectionHeaderTable =
reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff);
uint32_t SectionTableSize = Header->e_shnum * Header->e_shentsize;
uint64_t SectionTableSize = getNumSections() * Header->e_shentsize;
if (!( (const uint8_t *)SectionHeaderTable + SectionTableSize
<= base() + Data->getBufferSize()))
// FIXME: Proper error handling.
report_fatal_error("Section table goes past end of file!");
// To find the symbol tables we walk the section table to find SHT_STMTAB.
// To find the symbol tables we walk the section table to find SHT_SYMTAB.
const Elf_Shdr* sh = reinterpret_cast<const Elf_Shdr*>(SectionHeaderTable);
for (unsigned i = 0; i < Header->e_shnum; ++i) {
for (uint64_t i = 0, e = getNumSections(); i != e; ++i) {
if (sh->sh_type == ELF::SHT_SYMTAB) {
SymbolTableSectionsIndexMap[i] = SymbolTableSections.size();
SymbolTableSections.push_back(sh);
@ -1094,7 +1096,7 @@ ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object
}
// Get string table sections.
dot_shstrtab_sec = getSection(Header->e_shstrndx);
dot_shstrtab_sec = getSection(getStringTableIndex());
if (dot_shstrtab_sec) {
// Verify that the last byte in the string table in a null.
if (((const char*)base() + dot_shstrtab_sec->sh_offset)
@ -1105,7 +1107,7 @@ ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object
// Merge this into the above loop.
for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable),
*e = i + Header->e_shnum * Header->e_shentsize;
*e = i + getNumSections() * Header->e_shentsize;
i != e; i += Header->e_shentsize) {
const Elf_Shdr *sh = reinterpret_cast<const Elf_Shdr*>(i);
if (sh->sh_type == ELF::SHT_STRTAB) {
@ -1165,7 +1167,7 @@ section_iterator ELFObjectFile<target_endianness, is64Bits>
memset(&ret, 0, sizeof(DataRefImpl));
ret.p = reinterpret_cast<intptr_t>(base()
+ Header->e_shoff
+ (Header->e_shentsize * Header->e_shnum));
+ (Header->e_shentsize*getNumSections()));
return section_iterator(SectionRef(ret, this));
}
@ -1218,6 +1220,25 @@ unsigned ELFObjectFile<target_endianness, is64Bits>::getArch() const {
}
}
template<support::endianness target_endianness, bool is64Bits>
uint64_t ELFObjectFile<target_endianness, is64Bits>::getNumSections() const {
if (Header->e_shnum == ELF::SHN_UNDEF)
return SectionHeaderTable->sh_size;
return Header->e_shnum;
}
template<support::endianness target_endianness, bool is64Bits>
uint64_t
ELFObjectFile<target_endianness, is64Bits>::getStringTableIndex() const {
if (Header->e_shnum == ELF::SHN_UNDEF) {
if (Header->e_shstrndx == ELF::SHN_HIRESERVE)
return SectionHeaderTable->sh_link;
if (Header->e_shstrndx >= getNumSections())
return 0;
}
return Header->e_shstrndx;
}
template<support::endianness target_endianness, bool is64Bits>
template<typename T>
@ -1268,10 +1289,10 @@ ELFObjectFile<target_endianness, is64Bits>::getSection(DataRefImpl Symb) const {
template<support::endianness target_endianness, bool is64Bits>
const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr *
ELFObjectFile<target_endianness, is64Bits>::getSection(uint16_t index) const {
if (index == 0 || index >= ELF::SHN_LORESERVE)
ELFObjectFile<target_endianness, is64Bits>::getSection(uint32_t index) const {
if (index == 0)
return 0;
if (!SectionHeaderTable || index >= Header->e_shnum)
if (!SectionHeaderTable || index >= getNumSections())
// FIXME: Proper error handling.
report_fatal_error("Invalid section index!");
@ -1282,7 +1303,7 @@ ELFObjectFile<target_endianness, is64Bits>::getSection(uint16_t index) const {
template<support::endianness target_endianness, bool is64Bits>
const char *ELFObjectFile<target_endianness, is64Bits>
::getString(uint16_t section,
::getString(uint32_t section,
ELF::Elf32_Word offset) const {
return getString(getSection(section), offset);
}