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author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2012-10-25 12:27:42 +0000 |
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committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2012-10-25 12:27:42 +0000 |
commit | aa71428378c1cb491ca60041d8ba7aa110bc963d (patch) | |
tree | 908897b170bef9bf01d423f2c18bca9ec90be162 /lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp | |
parent | c0cd72204d35bedbd2a36b240d9e5e95647fd2d2 (diff) | |
download | external_llvm-aa71428378c1cb491ca60041d8ba7aa110bc963d.zip external_llvm-aa71428378c1cb491ca60041d8ba7aa110bc963d.tar.gz external_llvm-aa71428378c1cb491ca60041d8ba7aa110bc963d.tar.bz2 |
Initial TOC support for PowerPC64 object creation
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
Diffstat (limited to 'lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp')
-rw-r--r-- | lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp | 70 |
1 files changed, 64 insertions, 6 deletions
diff --git a/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp b/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp index a197981..de3c352 100644 --- a/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp +++ b/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp @@ -11,6 +11,8 @@ #include "MCTargetDesc/PPCMCTargetDesc.h" #include "llvm/MC/MCELFObjectWriter.h" #include "llvm/Support/ErrorHandling.h" +#include "llvm/MC/MCExpr.h" +#include "llvm/MC/MCValue.h" using namespace llvm; @@ -21,9 +23,15 @@ namespace { virtual ~PPCELFObjectWriter(); protected: + virtual unsigned getRelocTypeInner(const MCValue &Target, + const MCFixup &Fixup, + bool IsPCRel) const; virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup, bool IsPCRel, bool IsRelocWithSymbol, int64_t Addend) const; + virtual const MCSymbol *undefinedExplicitRelSym(const MCValue &Target, + const MCFixup &Fixup, + bool IsPCRel) const; virtual void adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset); }; } @@ -36,11 +44,13 @@ PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI) PPCELFObjectWriter::~PPCELFObjectWriter() { } -unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target, - const MCFixup &Fixup, - bool IsPCRel, - bool IsRelocWithSymbol, - int64_t Addend) const { +unsigned PPCELFObjectWriter::getRelocTypeInner(const MCValue &Target, + const MCFixup &Fixup, + bool IsPCRel) const +{ + MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ? + MCSymbolRefExpr::VK_None : Target.getSymA()->getKind(); + // determine the type of the relocation unsigned Type; if (IsPCRel) { @@ -61,7 +71,7 @@ unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target, Type = ELF::R_PPC_ADDR24; break; case PPC::fixup_ppc_brcond14: - Type = ELF::R_PPC_ADDR14_BRTAKEN; // XXX: or BRNTAKEN?_ + Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_ break; case PPC::fixup_ppc_ha16: Type = ELF::R_PPC_ADDR16_HA; @@ -72,6 +82,26 @@ unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target, case PPC::fixup_ppc_lo14: Type = ELF::R_PPC_ADDR14; break; + case PPC::fixup_ppc_toc: + Type = ELF::R_PPC64_TOC; + break; + case PPC::fixup_ppc_toc16: + Type = ELF::R_PPC64_TOC16; + break; + case PPC::fixup_ppc_toc16_ds: + Type = ELF::R_PPC64_TOC16_DS; + break; + case FK_Data_8: + switch (Modifier) { + default: llvm_unreachable("Unsupported Modifier"); + case MCSymbolRefExpr::VK_PPC_TOC: + Type = ELF::R_PPC64_TOC; + break; + case MCSymbolRefExpr::VK_None: + Type = ELF::R_PPC64_ADDR64; + break; + } + break; case FK_Data_4: Type = ELF::R_PPC_ADDR32; break; @@ -83,6 +113,34 @@ unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target, return Type; } +unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target, + const MCFixup &Fixup, + bool IsPCRel, + bool IsRelocWithSymbol, + int64_t Addend) const { + return getRelocTypeInner(Target, Fixup, IsPCRel); +} + +const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target, + const MCFixup &Fixup, + bool IsPCRel) const { + assert(Target.getSymA() && "SymA cannot be 0"); + const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol(); + + unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel); + + // The .odp creation emits a relocation against the symbol ".TOC." which + // create a R_PPC64_TOC relocation. However the relocation symbol name + // in final object creation should be NULL, since the symbol does not + // really exist, it is just the reference to TOC base for the current + // object file. + bool EmitThisSym = RelocType != ELF::R_PPC64_TOC; + + if (EmitThisSym && !Symbol.isTemporary()) + return &Symbol; + return NULL; +} + void PPCELFObjectWriter:: adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset) { switch ((unsigned)Fixup.getKind()) { |