static typename ELFT::uint getSymVA(const SymbolBody &Body,
typename ELFT::uint &Addend) {
typedef typename ELFT::uint uintX_t;
switch (Body.kind()) {
case SymbolBody::DefinedSyntheticKind: {
auto &D = cast<DefinedSynthetic<ELFT>>(Body);
const OutputSectionBase<ELFT> *Sec = D.Section;
if (!Sec)
return D.Value;
if (D.Value == DefinedSynthetic<ELFT>::SectionEnd)
return Sec->getVA() + Sec->getSize();
return Sec->getVA() + D.Value;
}
case SymbolBody::DefinedRegularKind: {
auto &D = cast<DefinedRegular<ELFT>>(Body);
InputSectionBase<ELFT> *SC = D.Section;
// According to the ELF spec reference to a local symbol from outside
// the group are not allowed. Unfortunately .eh_frame breaks that rule
// and must be treated specially. For now we just replace the symbol with
// 0.
if (SC == &InputSection<ELFT>::Discarded)
return 0;
// This is an absolute symbol.
if (!SC)
return D.Value;
uintX_t Offset = D.Value;
if (D.isSection()) {
Offset += Addend;
Addend = 0;
}
uintX_t VA = SC->OutSec->getVA() + SC->getOffset(Offset);
if (D.isTls())
return VA - Out<ELFT>::TlsPhdr->p_vaddr;
return VA;
}
case SymbolBody::DefinedCommonKind:
return Out<ELFT>::Bss->getVA() + cast<DefinedCommon>(Body).OffsetInBss;
case SymbolBody::SharedKind: {
auto &SS = cast<SharedSymbol<ELFT>>(Body);
if (!SS.NeedsCopyOrPltAddr)
return 0;
if (SS.isFunc())
return Body.getPltVA<ELFT>();
return Out<ELFT>::Bss->getVA() + SS.OffsetInBss;
}
case SymbolBody::UndefinedKind:
return 0;
case SymbolBody::LazyArchiveKind:
case SymbolBody::LazyObjectKind:
assert(Body.symbol()->IsUsedInRegularObj && "lazy symbol reached writer");
return 0;
case SymbolBody::DefinedBitcodeKind:
llvm_unreachable("should have been replaced");
}
llvm_unreachable("invalid symbol kind");
}
void InputSection::copyRelocations(uint8_t *Buf, ArrayRef<RelTy> Rels) {
InputSectionBase *Sec = getRelocatedSection();
for (const RelTy &Rel : Rels) {
RelType Type = Rel.getType(Config->IsMips64EL);
Symbol &Sym = getFile<ELFT>()->getRelocTargetSym(Rel);
auto *P = reinterpret_cast<typename ELFT::Rela *>(Buf);
Buf += sizeof(RelTy);
if (Config->IsRela)
P->r_addend = getAddend<ELFT>(Rel);
// Output section VA is zero for -r, so r_offset is an offset within the
// section, but for --emit-relocs it is an virtual address.
P->r_offset = Sec->getOutputSection()->Addr + Sec->getOffset(Rel.r_offset);
P->setSymbolAndType(InX::SymTab->getSymbolIndex(&Sym), Type,
Config->IsMips64EL);
if (Sym.Type == STT_SECTION) {
// We combine multiple section symbols into only one per
// section. This means we have to update the addend. That is
// trivial for Elf_Rela, but for Elf_Rel we have to write to the
// section data. We do that by adding to the Relocation vector.
// .eh_frame is horribly special and can reference discarded sections. To
// avoid having to parse and recreate .eh_frame, we just replace any
// relocation in it pointing to discarded sections with R_*_NONE, which
// hopefully creates a frame that is ignored at runtime.
auto *D = dyn_cast<Defined>(&Sym);
if (!D) {
error("STT_SECTION symbol should be defined");
continue;
}
SectionBase *Section = D->Section;
if (Section == &InputSection::Discarded) {
P->setSymbolAndType(0, 0, false);
continue;
}
if (Config->IsRela) {
P->r_addend =
Sym.getVA(getAddend<ELFT>(Rel)) - Section->getOutputSection()->Addr;
} else if (Config->Relocatable) {
const uint8_t *BufLoc = Sec->Data.begin() + Rel.r_offset;
Sec->Relocations.push_back({R_ABS, Type, Rel.r_offset,
Target->getImplicitAddend(BufLoc, Type),
&Sym});
}
}
}
}
void InputSection<ELFT>::copyRelocations(uint8_t *Buf, ArrayRef<RelTy> Rels) {
InputSectionBase<ELFT> *RelocatedSection = getRelocatedSection();
for (const RelTy &Rel : Rels) {
uint32_t Type = Rel.getType(Config->Mips64EL);
SymbolBody &Body = this->File->getRelocTargetSym(Rel);
RelTy *P = reinterpret_cast<RelTy *>(Buf);
Buf += sizeof(RelTy);
P->r_offset = RelocatedSection->getOffset(Rel.r_offset);
P->setSymbolAndType(Body.DynsymIndex, Type, Config->Mips64EL);
}
}
static typename ELFT::uint getSymVA(const SymbolBody &Body,
typename ELFT::uint &Addend) {
typedef typename ELFT::uint uintX_t;
switch (Body.kind()) {
case SymbolBody::DefinedSyntheticKind: {
auto &D = cast<DefinedSynthetic>(Body);
const OutputSectionBase *Sec = D.Section;
if (!Sec)
return D.Value;
if (D.Value == uintX_t(-1))
return Sec->Addr + Sec->Size;
return Sec->Addr + D.Value;
}
case SymbolBody::DefinedRegularKind: {
auto &D = cast<DefinedRegular<ELFT>>(Body);
InputSectionBase<ELFT> *IS = D.Section;
// According to the ELF spec reference to a local symbol from outside
// the group are not allowed. Unfortunately .eh_frame breaks that rule
// and must be treated specially. For now we just replace the symbol with
// 0.
if (IS == &InputSection<ELFT>::Discarded)
return 0;
// This is an absolute symbol.
if (!IS)
return D.Value;
uintX_t Offset = D.Value;
if (D.isSection()) {
Offset += Addend;
Addend = 0;
}
uintX_t VA = (IS->OutSec ? IS->OutSec->Addr : 0) + IS->getOffset(Offset);
if (D.isTls() && !Config->Relocatable) {
if (!Out<ELFT>::TlsPhdr)
fatal(toString(D.File) +
" has a STT_TLS symbol but doesn't have a PT_TLS section");
return VA - Out<ELFT>::TlsPhdr->p_vaddr;
}
return VA;
}
case SymbolBody::DefinedCommonKind:
if (!Config->DefineCommon)
return 0;
return In<ELFT>::Common->OutSec->Addr + In<ELFT>::Common->OutSecOff +
cast<DefinedCommon>(Body).Offset;
case SymbolBody::SharedKind: {
auto &SS = cast<SharedSymbol<ELFT>>(Body);
if (!SS.NeedsCopyOrPltAddr)
return 0;
if (SS.isFunc())
return Body.getPltVA<ELFT>();
return SS.getBssSectionForCopy()->Addr + SS.CopyOffset;
}
case SymbolBody::UndefinedKind:
return 0;
case SymbolBody::LazyArchiveKind:
case SymbolBody::LazyObjectKind:
assert(Body.symbol()->IsUsedInRegularObj && "lazy symbol reached writer");
return 0;
}
llvm_unreachable("invalid symbol kind");
}