bool ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
const ELFYAML::MipsABIFlags &Section,
ContiguousBlobAccumulator &CBA) {
assert(Section.Type == llvm::ELF::SHT_MIPS_ABIFLAGS &&
"Section type is not SHT_MIPS_ABIFLAGS");
object::Elf_Mips_ABIFlags<ELFT> Flags;
zero(Flags);
SHeader.sh_entsize = sizeof(Flags);
SHeader.sh_size = SHeader.sh_entsize;
auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
Flags.version = Section.Version;
Flags.isa_level = Section.ISALevel;
Flags.isa_rev = Section.ISARevision;
Flags.gpr_size = Section.GPRSize;
Flags.cpr1_size = Section.CPR1Size;
Flags.cpr2_size = Section.CPR2Size;
Flags.fp_abi = Section.FpABI;
Flags.isa_ext = Section.ISAExtension;
Flags.ases = Section.ASEs;
Flags.flags1 = Section.Flags1;
Flags.flags2 = Section.Flags2;
OS.write((const char *)&Flags, sizeof(Flags));
return true;
}
bool ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
const ELFYAML::Group &Section,
ContiguousBlobAccumulator &CBA) {
typedef typename object::ELFFile<ELFT>::Elf_Word Elf_Word;
assert(Section.Type == llvm::ELF::SHT_GROUP &&
"Section type is not SHT_GROUP");
SHeader.sh_entsize = sizeof(Elf_Word);
SHeader.sh_size = SHeader.sh_entsize * Section.Members.size();
auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
for (auto member : Section.Members) {
Elf_Word SIdx;
unsigned int sectionIndex = 0;
if (member.sectionNameOrType == "GRP_COMDAT")
sectionIndex = llvm::ELF::GRP_COMDAT;
else if (SN2I.lookup(member.sectionNameOrType, sectionIndex)) {
errs() << "error: Unknown section referenced: '"
<< member.sectionNameOrType << "' at YAML section' "
<< Section.Name << "\n";
return false;
}
SIdx = sectionIndex;
OS.write((const char *)&SIdx, sizeof(SIdx));
}
return true;
}
static void createStringTableSectionHeader(Elf_Shdr &SHeader,
StringTableBuilder &STB,
ContiguousBlobAccumulator &CBA) {
SHeader.sh_type = ELF::SHT_STRTAB;
STB.writeToStream(CBA.getOSAndAlignedOffset(SHeader.sh_offset));
SHeader.sh_size = STB.size();
SHeader.sh_addralign = 1;
}
void ELFState<ELFT>::initStrtabSectionHeader(Elf_Shdr &SHeader, StringRef Name,
StringTableBuilder &STB,
ContiguousBlobAccumulator &CBA) {
zero(SHeader);
SHeader.sh_name = DotShStrtab.getOffset(Name);
SHeader.sh_type = ELF::SHT_STRTAB;
STB.write(CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign));
SHeader.sh_size = STB.getSize();
SHeader.sh_addralign = 1;
}
void
ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
const ELFYAML::RawContentSection &Section,
ContiguousBlobAccumulator &CBA) {
assert(Section.Size >= Section.Content.binary_size() &&
"Section size and section content are inconsistent");
raw_ostream &OS =
CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
Section.Content.writeAsBinary(OS);
for (auto i = Section.Content.binary_size(); i < Section.Size; ++i)
OS.write(0);
SHeader.sh_entsize = 0;
SHeader.sh_size = Section.Size;
}
void ELFState<ELFT>::initSymtabSectionHeader(Elf_Shdr &SHeader,
SymtabType STType,
ContiguousBlobAccumulator &CBA) {
zero(SHeader);
bool IsStatic = STType == SymtabType::Static;
SHeader.sh_name = DotShStrtab.getOffset(IsStatic ? ".symtab" : ".dynsym");
SHeader.sh_type = IsStatic ? ELF::SHT_SYMTAB : ELF::SHT_DYNSYM;
SHeader.sh_link = IsStatic ? getDotStrTabSecNo() : getDotDynStrSecNo();
const auto &Symbols = IsStatic ? Doc.Symbols : Doc.DynamicSymbols;
auto &Strtab = IsStatic ? DotStrtab : DotDynstr;
// One greater than symbol table index of the last local symbol.
SHeader.sh_info = Symbols.Local.size() + 1;
SHeader.sh_entsize = sizeof(Elf_Sym);
SHeader.sh_addralign = 8;
std::vector<Elf_Sym> Syms;
{
// Ensure STN_UNDEF is present
Elf_Sym Sym;
zero(Sym);
Syms.push_back(Sym);
}
// Add symbol names to .strtab or .dynstr.
for (const auto &Sym : Symbols.Local)
Strtab.add(Sym.Name);
for (const auto &Sym : Symbols.Global)
Strtab.add(Sym.Name);
for (const auto &Sym : Symbols.Weak)
Strtab.add(Sym.Name);
Strtab.finalize();
addSymbols(Symbols.Local, Syms, ELF::STB_LOCAL, Strtab);
addSymbols(Symbols.Global, Syms, ELF::STB_GLOBAL, Strtab);
addSymbols(Symbols.Weak, Syms, ELF::STB_WEAK, Strtab);
writeArrayData(
CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign),
makeArrayRef(Syms));
SHeader.sh_size = arrayDataSize(makeArrayRef(Syms));
}
void
ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
const ELFYAML::RawContentSection &Section,
ContiguousBlobAccumulator &CBA) {
assert(Section.Size >= Section.Content.binary_size() &&
"Section size and section content are inconsistent");
raw_ostream &OS =
CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
Section.Content.writeAsBinary(OS);
for (auto i = Section.Content.binary_size(); i < Section.Size; ++i)
OS.write(0);
if (Section.EntSize)
SHeader.sh_entsize = *Section.EntSize;
else if (Section.Type == llvm::ELF::SHT_RELR)
SHeader.sh_entsize = sizeof(Elf_Relr);
else if (Section.Type == llvm::ELF::SHT_DYNAMIC)
SHeader.sh_entsize = sizeof(Elf_Dyn);
else
SHeader.sh_entsize = 0;
SHeader.sh_size = Section.Size;
}
bool
ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
const ELFYAML::RelocationSection &Section,
ContiguousBlobAccumulator &CBA) {
assert((Section.Type == llvm::ELF::SHT_REL ||
Section.Type == llvm::ELF::SHT_RELA) &&
"Section type is not SHT_REL nor SHT_RELA");
bool IsRela = Section.Type == llvm::ELF::SHT_RELA;
SHeader.sh_entsize = IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel);
SHeader.sh_size = SHeader.sh_entsize * Section.Relocations.size();
auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
for (const auto &Rel : Section.Relocations) {
unsigned SymIdx = 0;
// Some special relocation, R_ARM_v4BX for instance, does not have
// an external reference. So it ignores the return value of lookup()
// here.
if (Rel.Symbol)
SymN2I.lookup(*Rel.Symbol, SymIdx);
if (IsRela) {
Elf_Rela REntry;
zero(REntry);
REntry.r_offset = Rel.Offset;
REntry.r_addend = Rel.Addend;
REntry.setSymbolAndType(SymIdx, Rel.Type, isMips64EL(Doc));
OS.write((const char *)&REntry, sizeof(REntry));
} else {
Elf_Rel REntry;
zero(REntry);
REntry.r_offset = Rel.Offset;
REntry.setSymbolAndType(SymIdx, Rel.Type, isMips64EL(Doc));
OS.write((const char *)&REntry, sizeof(REntry));
}
}
return true;
}
void ELFState<ELFT>::initSymtabSectionHeader(Elf_Shdr &SHeader,
ContiguousBlobAccumulator &CBA) {
zero(SHeader);
SHeader.sh_name = DotShStrtab.getOffset(".symtab");
SHeader.sh_type = ELF::SHT_SYMTAB;
SHeader.sh_link = getDotStrTabSecNo();
// One greater than symbol table index of the last local symbol.
SHeader.sh_info = Doc.Symbols.Local.size() + 1;
SHeader.sh_entsize = sizeof(Elf_Sym);
SHeader.sh_addralign = 8;
std::vector<Elf_Sym> Syms;
{
// Ensure STN_UNDEF is present
Elf_Sym Sym;
zero(Sym);
Syms.push_back(Sym);
}
// Add symbol names to .strtab.
for (const auto &Sym : Doc.Symbols.Local)
DotStrtab.add(Sym.Name);
for (const auto &Sym : Doc.Symbols.Global)
DotStrtab.add(Sym.Name);
for (const auto &Sym : Doc.Symbols.Weak)
DotStrtab.add(Sym.Name);
DotStrtab.finalize(StringTableBuilder::ELF);
addSymbols(Doc.Symbols.Local, Syms, ELF::STB_LOCAL);
addSymbols(Doc.Symbols.Global, Syms, ELF::STB_GLOBAL);
addSymbols(Doc.Symbols.Weak, Syms, ELF::STB_WEAK);
writeArrayData(
CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign),
makeArrayRef(Syms));
SHeader.sh_size = arrayDataSize(makeArrayRef(Syms));
}
bool ELFState<ELFT>::initSectionHeaders(std::vector<Elf_Shdr> &SHeaders,
ContiguousBlobAccumulator &CBA) {
// Ensure SHN_UNDEF entry is present. An all-zero section header is a
// valid SHN_UNDEF entry since SHT_NULL == 0.
Elf_Shdr SHeader;
zero(SHeader);
SHeaders.push_back(SHeader);
for (const auto &Sec : Doc.Sections)
DotShStrtab.add(Sec->Name);
DotShStrtab.finalize(StringTableBuilder::ELF);
for (const auto &Sec : Doc.Sections) {
zero(SHeader);
SHeader.sh_name = DotShStrtab.getOffset(Sec->Name);
SHeader.sh_type = Sec->Type;
SHeader.sh_flags = Sec->Flags;
SHeader.sh_addr = Sec->Address;
SHeader.sh_addralign = Sec->AddressAlign;
if (!Sec->Link.empty()) {
unsigned Index;
if (SN2I.lookup(Sec->Link, Index)) {
errs() << "error: Unknown section referenced: '" << Sec->Link
<< "' at YAML section '" << Sec->Name << "'.\n";
return false;
}
SHeader.sh_link = Index;
}
if (auto S = dyn_cast<ELFYAML::RawContentSection>(Sec.get()))
writeSectionContent(SHeader, *S, CBA);
else if (auto S = dyn_cast<ELFYAML::RelocationSection>(Sec.get())) {
if (S->Link.empty())
// For relocation section set link to .symtab by default.
SHeader.sh_link = getDotSymTabSecNo();
unsigned Index;
if (SN2I.lookup(S->Info, Index)) {
errs() << "error: Unknown section referenced: '" << S->Info
<< "' at YAML section '" << S->Name << "'.\n";
return false;
}
SHeader.sh_info = Index;
if (!writeSectionContent(SHeader, *S, CBA))
return false;
} else if (auto S = dyn_cast<ELFYAML::Group>(Sec.get())) {
unsigned SymIdx;
if (SymN2I.lookup(S->Info, SymIdx)) {
errs() << "error: Unknown symbol referenced: '" << S->Info
<< "' at YAML section '" << S->Name << "'.\n";
return false;
}
SHeader.sh_info = SymIdx;
if (!writeSectionContent(SHeader, *S, CBA))
return false;
} else if (auto S = dyn_cast<ELFYAML::MipsABIFlags>(Sec.get())) {
if (!writeSectionContent(SHeader, *S, CBA))
return false;
} else if (auto S = dyn_cast<ELFYAML::NoBitsSection>(Sec.get())) {
SHeader.sh_entsize = 0;
SHeader.sh_size = S->Size;
// SHT_NOBITS section does not have content
// so just to setup the section offset.
CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
} else
llvm_unreachable("Unknown section type");
SHeaders.push_back(SHeader);
}
return true;
}
