diff options
Diffstat (limited to 'llvm/lib/MC/ELFObjectWriter.cpp')
-rw-r--r-- | llvm/lib/MC/ELFObjectWriter.cpp | 49 |
1 files changed, 21 insertions, 28 deletions
diff --git a/llvm/lib/MC/ELFObjectWriter.cpp b/llvm/lib/MC/ELFObjectWriter.cpp index a5cd0b6..592081d 100644 --- a/llvm/lib/MC/ELFObjectWriter.cpp +++ b/llvm/lib/MC/ELFObjectWriter.cpp @@ -1278,7 +1278,6 @@ bool ELFObjectWriter::useSectionSymbol(const MCValue &Val, // If we change such a relocation to use the section, the linker would think // that it pointed to another string and subtracting 42 at runtime will // produce the wrong value. - auto EMachine = TargetObjectWriter->getEMachine(); if (Sym->isInSection()) { auto &Sec = cast<MCSectionELF>(Sym->getSection()); unsigned Flags = Sec.getFlags(); @@ -1288,7 +1287,8 @@ bool ELFObjectWriter::useSectionSymbol(const MCValue &Val, // gold<2.34 incorrectly ignored the addend for R_386_GOTOFF (9) // (http://sourceware.org/PR16794). - if (EMachine == ELF::EM_386 && Type == ELF::R_386_GOTOFF) + if (TargetObjectWriter->getEMachine() == ELF::EM_386 && + Type == ELF::R_386_GOTOFF) return false; // ld.lld handles R_MIPS_HI16/R_MIPS_LO16 separately, not as a whole, so @@ -1298,7 +1298,8 @@ bool ELFObjectWriter::useSectionSymbol(const MCValue &Val, // (like R_RISCV_PC_INDIRECT for R_RISCV_PCREL_HI20 / R_RISCV_PCREL_LO12) // but the complexity is unnecessary given that GNU as keeps the original // symbol for this case as well. - if (EMachine == ELF::EM_MIPS && !hasRelocationAddend()) + if (TargetObjectWriter->getEMachine() == ELF::EM_MIPS && + !hasRelocationAddend()) return false; } @@ -1331,14 +1332,14 @@ void ELFObjectWriter::recordRelocation(const MCFragment &F, const MCFixup &Fixup, MCValue Target, uint64_t &FixedValue) { MCAsmBackend &Backend = Asm->getBackend(); - const MCSectionELF &FixupSection = cast<MCSectionELF>(*F.getParent()); + const MCSectionELF &Section = cast<MCSectionELF>(*F.getParent()); MCContext &Ctx = getContext(); const auto *SymA = cast_or_null<MCSymbolELF>(Target.getAddSym()); const MCSectionELF *SecA = (SymA && SymA->isInSection()) ? cast<MCSectionELF>(&SymA->getSection()) : nullptr; - if (DwoOS && !checkRelocation(Fixup.getLoc(), &FixupSection, SecA)) + if (DwoOS && !checkRelocation(Fixup.getLoc(), &Section, SecA)) return; bool IsPCRel = Backend.getFixupKindInfo(Fixup.getKind()).Flags & @@ -1356,7 +1357,7 @@ void ELFObjectWriter::recordRelocation(const MCFragment &F, assert(!SymB.isAbsolute() && "Should have been folded"); const MCSection &SecB = SymB.getSection(); - if (&SecB != &FixupSection) { + if (&SecB != &Section) { Ctx.reportError(Fixup.getLoc(), "Cannot represent a difference across sections"); return; @@ -1373,31 +1374,23 @@ void ELFObjectWriter::recordRelocation(const MCFragment &F, else Type = TargetObjectWriter->getRelocType(Fixup, Target, IsPCRel); - bool UseSectionSym = - SymA && SymA->getBinding() == ELF::STB_LOCAL && !SymA->isUndefined(); - if (UseSectionSym) { - UseSectionSym = useSectionSymbol(Target, SymA, Addend, Type); - - // Disable STT_SECTION adjustment for .reloc directives. - UseSectionSym &= !mc::isRelocRelocation(Fixup.getKind()); - - if (UseSectionSym) - Addend += Asm->getSymbolOffset(*SymA); - } - - FixedValue = usesRela(Ctx.getTargetOptions(), FixupSection) ? 0 : Addend; - if (UseSectionSym) { + // Convert SymA to an STT_SECTION symbol if it's defined, local, and meets + // specific conditions, unless it's a .reloc directive, which disables + // STT_SECTION adjustment. + bool UseSectionSym = SymA && SymA->getBinding() == ELF::STB_LOCAL && + !SymA->isUndefined() && + !mc::isRelocRelocation(Fixup.getKind()); + if (UseSectionSym && useSectionSymbol(Target, SymA, Addend, Type)) { + Addend += Asm->getSymbolOffset(*SymA); SymA = cast<MCSymbolELF>(SecA->getBeginSymbol()); + } else if (const MCSymbolELF *R = Renames.lookup(SymA)) { + SymA = R; + } + if (SymA) SymA->setUsedInReloc(); - } else { - if (SymA) { - if (const MCSymbolELF *R = Renames.lookup(SymA)) - SymA = R; - SymA->setUsedInReloc(); - } - } - Relocations[&FixupSection].emplace_back(FixupOffset, SymA, Type, Addend); + FixedValue = usesRela(Ctx.getTargetOptions(), Section) ? 0 : Addend; + Relocations[&Section].emplace_back(FixupOffset, SymA, Type, Addend); } bool ELFObjectWriter::usesRela(const MCTargetOptions *TO, |