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Initial TOC support for PowerPC64 object creation

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This patch adds initial PPC64 TOC MC object creation using the small mcmodel
(a single 64K TOC) adding the some TOC relocations (R_PPC64_TOC,
R_PPC64_TOC16, and R_PPC64_TOC16DS).

The addition of 'undefinedExplicitRelSym' hook on 'MCELFObjectTargetWriter'
is meant to avoid the creation of an unreferenced ".TOC." symbol (used in
the .odp creation) as well to set the R_PPC64_TOC relocation target as the
temporary ".TOC." symbol. On PPC64 ABI, the R_PPC64_TOC relocation should
not point to any symbol.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166677 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adhemerval Zanella
2012-10-25 12:27:42 +00:00
parent c0cd72204d
commit aa71428378
11 changed files with 223 additions and 23 deletions
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18
lib/MC/ELFObjectWriter.cpp
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@ -133,6 +133,11 @@ class ELFObjectWriter : public MCObjectWriter {
bool IsPCRel) const {
return TargetObjectWriter->ExplicitRelSym(Asm, Target, F, Fixup, IsPCRel);
}
const MCSymbol *undefinedExplicitRelSym(const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel) const {
return TargetObjectWriter->undefinedExplicitRelSym(Target, Fixup, IsPCRel);
}
bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
bool hasRelocationAddend() const {
@ -639,7 +644,7 @@ const MCSymbol *ELFObjectWriter::SymbolToReloc(const MCAssembler &Asm,
if (ASymbol.isUndefined()) {
if (Renamed)
return Renamed;
return &ASymbol;
return undefinedExplicitRelSym(Target, Fixup, IsPCRel);
}
if (SD.isExternal()) {
@ -721,10 +726,13 @@ void ELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
MCSymbolData &SD = Asm.getSymbolData(ASymbol);
MCFragment *F = SD.getFragment();
Index = F->getParent()->getOrdinal() + 1;
// Offset of the symbol in the section
Value += Layout.getSymbolOffset(&SD);
if (F) {
Index = F->getParent()->getOrdinal() + 1;
// Offset of the symbol in the section
Value += Layout.getSymbolOffset(&SD);
} else {
Index = 0;
}
} else {
if (Asm.getSymbolData(Symbol).getFlags() & ELF_Other_Weakref)
WeakrefUsedInReloc.insert(RelocSymbol);