FWriter.write(F, Value);
}
- void WriteHeader(const MCAssembler &Asm,
- unsigned NumberOfSections);
+ void writeHeader(const MCAssembler &Asm);
void WriteSymbol(SymbolTableWriter &Writer, ELFSymbolData &MSD,
const MCAsmLayout &Layout);
void WriteRelocations(MCAssembler &Asm, const MCAsmLayout &Layout);
+ void
+ createSectionHeaderStringTable(MCAssembler &Asm,
+ std::vector<const MCSectionELF *> &Sections);
+ void createStringTable(MCAssembler &Asm,
+ std::vector<const MCSectionELF *> &Sections);
void CreateMetadataSections(MCAssembler &Asm, const MCAsmLayout &Layout,
std::vector<const MCSectionELF *> &Sections);
{}
// Emit the ELF header.
-void ELFObjectWriter::WriteHeader(const MCAssembler &Asm,
- unsigned NumberOfSections) {
+void ELFObjectWriter::writeHeader(const MCAssembler &Asm) {
// ELF Header
// ----------
//
Write16(is64Bit() ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr));
// e_shnum = # of section header ents
- if (NumberOfSections >= ELF::SHN_LORESERVE)
- Write16(ELF::SHN_UNDEF);
- else
- Write16(NumberOfSections);
+ Write16(0);
// e_shstrndx = Section # of '.shstrtab'
- if (ShstrtabIndex >= ELF::SHN_LORESERVE)
- Write16(ELF::SHN_XINDEX);
- else
- Write16(ShstrtabIndex);
+ assert(ShstrtabIndex < ELF::SHN_LORESERVE);
+ Write16(ShstrtabIndex);
}
uint64_t ELFObjectWriter::SymbolValue(MCSymbolData &Data,
}
}
+void ELFObjectWriter::createSectionHeaderStringTable(
+ MCAssembler &Asm, std::vector<const MCSectionELF *> &Sections) {
+ const MCSectionELF *ShstrtabSection = Sections[ShstrtabIndex - 1];
+
+ Asm.getOrCreateSectionData(*ShstrtabSection);
+
+ for (MCSectionData &SD : Asm) {
+ const MCSectionELF &Section =
+ static_cast<const MCSectionELF &>(SD.getSection());
+ ShStrTabBuilder.add(Section.getSectionName());
+ }
+ ShStrTabBuilder.finalize(StringTableBuilder::ELF);
+ OS << ShStrTabBuilder.data();
+}
+
+void ELFObjectWriter::createStringTable(
+ MCAssembler &Asm, std::vector<const MCSectionELF *> &Sections) {
+ MCContext &Ctx = Asm.getContext();
+ const MCSectionELF *StrtabSection =
+ Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0);
+ Asm.getOrCreateSectionData(*StrtabSection);
+ Sections.push_back(StrtabSection);
+ StringTableIndex = Sections.size();
+ OS << StrTabBuilder.data();
+}
+
void ELFObjectWriter::CreateMetadataSections(
MCAssembler &Asm, const MCAsmLayout &Layout,
std::vector<const MCSectionELF *> &Sections) {
unsigned EntrySize = is64Bit() ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32;
- // We construct .shstrtab, .symtab and .strtab in this order to match gnu as.
- const MCSectionELF *ShstrtabSection =
- Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0);
- MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection);
- ShstrtabSD.setAlignment(1);
- ShstrtabIndex = Sections.size() + 1;
- Sections.push_back(ShstrtabSection);
-
+ // Symbol table
const MCSectionELF *SymtabSection =
Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0,
EntrySize, "");
SymtabSD.setAlignment(is64Bit() ? 8 : 4);
SymbolTableIndex = Sections.size() + 1;
Sections.push_back(SymtabSection);
-
- const MCSectionELF *StrtabSection;
- StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0);
- MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection);
- StrtabSD.setAlignment(1);
- StringTableIndex = Sections.size() + 1;
- Sections.push_back(StrtabSection);
-
- // Symbol table
F = new MCDataFragment(&SymtabSD);
WriteSymbolTable(F, Asm, Layout, Sections);
-
- F = new MCDataFragment(&StrtabSD);
- F->getContents().append(StrTabBuilder.data().begin(),
- StrTabBuilder.data().end());
-
- F = new MCDataFragment(&ShstrtabSD);
-
- // Section header string table.
- for (auto it = Asm.begin(), ie = Asm.end(); it != ie; ++it) {
- const MCSectionELF &Section =
- static_cast<const MCSectionELF&>(it->getSection());
- ShStrTabBuilder.add(Section.getSectionName());
- }
- ShStrTabBuilder.finalize(StringTableBuilder::ELF);
- F->getContents().append(ShStrTabBuilder.data().begin(),
- ShStrTabBuilder.data().end());
}
void ELFObjectWriter::createIndexedSections(
SectionIndexMapTy &SectionIndexMap) {
MCContext &Ctx = Asm.getContext();
+ const MCSectionELF *ShstrtabSection =
+ Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0);
+ Sections.push_back(ShstrtabSection);
+ ShstrtabIndex = Sections.size();
+ assert(ShstrtabIndex == 1);
+
// Build the groups
for (const MCSectionData &SD : Asm) {
const MCSectionELF &Section =
// Null section first.
uint64_t FirstSectionSize =
(NumSections + 1) >= ELF::SHN_LORESERVE ? NumSections + 1 : 0;
- uint32_t FirstSectionLink =
- ShstrtabIndex >= ELF::SHN_LORESERVE ? ShstrtabIndex : 0;
- WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, FirstSectionLink, 0, 0, 0);
+ WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, 0, 0, 0, 0);
for (unsigned i = 0; i < NumSections; ++i) {
const MCSectionELF &Section = *Sections[i];
CreateMetadataSections(Asm, Layout, Sections);
- unsigned NumSections = Asm.size();
SectionOffsetsTy SectionOffsets;
// Write out the ELF header ...
- WriteHeader(Asm, NumSections + 1);
+ writeHeader(Asm);
// ... then the sections ...
- for (const MCSectionELF *Section : Sections) {
- const MCSectionData &SD = Asm.getOrCreateSectionData(*Section);
+ SectionOffsets.push_back(std::make_pair(0, 0));
+ for (auto I = ++Sections.begin(), E = Sections.end(); I != E; ++I) {
+ const MCSectionData &SD = Asm.getOrCreateSectionData(**I);
uint64_t Padding = OffsetToAlignment(OS.tell(), SD.getAlignment());
WriteZeros(Padding);
SectionOffsets.push_back(std::make_pair(SecStart, SecEnd));
}
+ {
+ uint64_t SecStart = OS.tell();
+ createStringTable(Asm, Sections);
+ uint64_t SecEnd = OS.tell();
+ SectionOffsets.push_back(std::make_pair(SecStart, SecEnd));
+ }
+
+ {
+ uint64_t SecStart = OS.tell();
+ createSectionHeaderStringTable(Asm, Sections);
+ uint64_t SecEnd = OS.tell();
+ SectionOffsets[0] = std::make_pair(SecStart, SecEnd);
+ }
+
uint64_t NaturalAlignment = is64Bit() ? 8 : 4;
uint64_t Padding = OffsetToAlignment(OS.tell(), NaturalAlignment);
WriteZeros(Padding);
// ... then the section header table ...
writeSectionHeader(Sections, Asm, Layout, SectionIndexMap, SectionOffsets);
+ uint16_t NumSections = (Sections.size() + 1 >= ELF::SHN_LORESERVE)
+ ? ELF::SHN_UNDEF
+ : Sections.size() + 1;
+ if (sys::IsLittleEndianHost != IsLittleEndian)
+ sys::swapByteOrder(NumSections);
+ unsigned NumSectionsOffset;
+
if (is64Bit()) {
uint64_t Val = SectionHeaderOffset;
if (sys::IsLittleEndianHost != IsLittleEndian)
sys::swapByteOrder(Val);
OS.pwrite(reinterpret_cast<char *>(&Val), sizeof(Val),
offsetof(ELF::Elf64_Ehdr, e_shoff));
+ NumSectionsOffset = offsetof(ELF::Elf64_Ehdr, e_shnum);
} else {
uint32_t Val = SectionHeaderOffset;
if (sys::IsLittleEndianHost != IsLittleEndian)
sys::swapByteOrder(Val);
OS.pwrite(reinterpret_cast<char *>(&Val), sizeof(Val),
offsetof(ELF::Elf32_Ehdr, e_shoff));
+ NumSectionsOffset = offsetof(ELF::Elf32_Ehdr, e_shnum);
}
+ OS.pwrite(reinterpret_cast<char *>(&NumSections), sizeof(NumSections),
+ NumSectionsOffset);
}
bool ELFObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(
projects / oota-llvm.git / blobdiff