//===-- PPCELFObjectWriter.cpp - PPC ELF Writer ---------------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// #include "MCTargetDesc/PPCMCTargetDesc.h" #include "MCTargetDesc/PPCFixupKinds.h" #include "llvm/ADT/STLExtras.h" #include "llvm/MC/MCELFObjectWriter.h" #include "llvm/MC/MCExpr.h" #include "llvm/MC/MCValue.h" #include "llvm/Support/ErrorHandling.h" using namespace llvm; namespace { class PPCELFObjectWriter : public MCELFObjectTargetWriter { public: PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI); 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; }; } PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI) : MCELFObjectTargetWriter(Is64Bit, OSABI, Is64Bit ? ELF::EM_PPC64 : ELF::EM_PPC, /*HasRelocationAddend*/ true) {} PPCELFObjectWriter::~PPCELFObjectWriter() { } 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) { switch ((unsigned)Fixup.getKind()) { default: llvm_unreachable("Unimplemented"); case PPC::fixup_ppc_br24: Type = ELF::R_PPC_REL24; break; case PPC::fixup_ppc_brcond14: Type = ELF::R_PPC_REL14; break; case FK_Data_4: case FK_PCRel_4: Type = ELF::R_PPC_REL32; break; case FK_Data_8: case FK_PCRel_8: Type = ELF::R_PPC64_REL64; break; } } else { switch ((unsigned)Fixup.getKind()) { default: llvm_unreachable("invalid fixup kind!"); case PPC::fixup_ppc_br24: Type = ELF::R_PPC_ADDR24; break; case PPC::fixup_ppc_brcond14: Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_ break; case PPC::fixup_ppc_half16: switch (Modifier) { default: llvm_unreachable("Unsupported Modifier"); case MCSymbolRefExpr::VK_None: Type = ELF::R_PPC_ADDR16; break; case MCSymbolRefExpr::VK_PPC_LO: Type = ELF::R_PPC_ADDR16_LO; break; case MCSymbolRefExpr::VK_PPC_HI: Type = ELF::R_PPC_ADDR16_HI; break; case MCSymbolRefExpr::VK_PPC_HA: Type = ELF::R_PPC_ADDR16_HA; break; case MCSymbolRefExpr::VK_PPC_HIGHER: Type = ELF::R_PPC64_ADDR16_HIGHER; break; case MCSymbolRefExpr::VK_PPC_HIGHERA: Type = ELF::R_PPC64_ADDR16_HIGHERA; break; case MCSymbolRefExpr::VK_PPC_HIGHEST: Type = ELF::R_PPC64_ADDR16_HIGHEST; break; case MCSymbolRefExpr::VK_PPC_HIGHESTA: Type = ELF::R_PPC64_ADDR16_HIGHESTA; break; case MCSymbolRefExpr::VK_PPC_TOC: Type = ELF::R_PPC64_TOC16; break; case MCSymbolRefExpr::VK_PPC_TOC_LO: Type = ELF::R_PPC64_TOC16_LO; break; case MCSymbolRefExpr::VK_PPC_TOC_HI: Type = ELF::R_PPC64_TOC16_HI; break; case MCSymbolRefExpr::VK_PPC_TOC_HA: Type = ELF::R_PPC64_TOC16_HA; break; case MCSymbolRefExpr::VK_PPC_TPREL: Type = ELF::R_PPC_TPREL16; break; case MCSymbolRefExpr::VK_PPC_TPREL_LO: Type = ELF::R_PPC_TPREL16_LO; break; case MCSymbolRefExpr::VK_PPC_TPREL_HI: Type = ELF::R_PPC_TPREL16_HI; break; case MCSymbolRefExpr::VK_PPC_TPREL_HA: Type = ELF::R_PPC_TPREL16_HA; break; case MCSymbolRefExpr::VK_PPC_TPREL_HIGHER: Type = ELF::R_PPC64_TPREL16_HIGHER; break; case MCSymbolRefExpr::VK_PPC_TPREL_HIGHERA: Type = ELF::R_PPC64_TPREL16_HIGHERA; break; case MCSymbolRefExpr::VK_PPC_TPREL_HIGHEST: Type = ELF::R_PPC64_TPREL16_HIGHEST; break; case MCSymbolRefExpr::VK_PPC_TPREL_HIGHESTA: Type = ELF::R_PPC64_TPREL16_HIGHESTA; break; case MCSymbolRefExpr::VK_PPC_DTPREL: Type = ELF::R_PPC64_DTPREL16; break; case MCSymbolRefExpr::VK_PPC_DTPREL_LO: Type = ELF::R_PPC64_DTPREL16_LO; break; case MCSymbolRefExpr::VK_PPC_DTPREL_HI: Type = ELF::R_PPC64_DTPREL16_HI; break; case MCSymbolRefExpr::VK_PPC_DTPREL_HA: Type = ELF::R_PPC64_DTPREL16_HA; break; case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHER: Type = ELF::R_PPC64_DTPREL16_HIGHER; break; case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHERA: Type = ELF::R_PPC64_DTPREL16_HIGHERA; break; case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHEST: Type = ELF::R_PPC64_DTPREL16_HIGHEST; break; case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHESTA: Type = ELF::R_PPC64_DTPREL16_HIGHESTA; break; case MCSymbolRefExpr::VK_PPC_GOT_TLSGD: Type = ELF::R_PPC64_GOT_TLSGD16; break; case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO: Type = ELF::R_PPC64_GOT_TLSGD16_LO; break; case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HI: Type = ELF::R_PPC64_GOT_TLSGD16_HI; break; case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA: Type = ELF::R_PPC64_GOT_TLSGD16_HA; break; case MCSymbolRefExpr::VK_PPC_GOT_TLSLD: Type = ELF::R_PPC64_GOT_TLSLD16; break; case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO: Type = ELF::R_PPC64_GOT_TLSLD16_LO; break; case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HI: Type = ELF::R_PPC64_GOT_TLSLD16_HI; break; case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA: Type = ELF::R_PPC64_GOT_TLSLD16_HA; break; case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI: Type = ELF::R_PPC64_GOT_TPREL16_HI; break; case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA: Type = ELF::R_PPC64_GOT_TPREL16_HA; break; case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI: Type = ELF::R_PPC64_GOT_DTPREL16_HI; break; case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA: Type = ELF::R_PPC64_GOT_DTPREL16_HA; break; } break; case PPC::fixup_ppc_half16ds: switch (Modifier) { default: llvm_unreachable("Unsupported Modifier"); case MCSymbolRefExpr::VK_None: Type = ELF::R_PPC64_ADDR16_DS; break; case MCSymbolRefExpr::VK_PPC_LO: Type = ELF::R_PPC64_ADDR16_LO_DS; break; case MCSymbolRefExpr::VK_PPC_TOC: Type = ELF::R_PPC64_TOC16_DS; break; case MCSymbolRefExpr::VK_PPC_TOC_LO: Type = ELF::R_PPC64_TOC16_LO_DS; break; case MCSymbolRefExpr::VK_PPC_TPREL: Type = ELF::R_PPC64_TPREL16_DS; break; case MCSymbolRefExpr::VK_PPC_TPREL_LO: Type = ELF::R_PPC64_TPREL16_LO_DS; break; case MCSymbolRefExpr::VK_PPC_DTPREL: Type = ELF::R_PPC64_DTPREL16_DS; break; case MCSymbolRefExpr::VK_PPC_DTPREL_LO: Type = ELF::R_PPC64_DTPREL16_LO_DS; break; case MCSymbolRefExpr::VK_PPC_GOT_TPREL: Type = ELF::R_PPC64_GOT_TPREL16_DS; break; case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO: Type = ELF::R_PPC64_GOT_TPREL16_LO_DS; break; case MCSymbolRefExpr::VK_PPC_GOT_DTPREL: Type = ELF::R_PPC64_GOT_DTPREL16_DS; break; case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO: Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS; break; } break; case PPC::fixup_ppc_tlsreg: Type = ELF::R_PPC64_TLS; break; case PPC::fixup_ppc_nofixup: switch (Modifier) { default: llvm_unreachable("Unsupported Modifier"); case MCSymbolRefExpr::VK_PPC_TLSGD: Type = ELF::R_PPC64_TLSGD; break; case MCSymbolRefExpr::VK_PPC_TLSLD: Type = ELF::R_PPC64_TLSLD; break; } break; case FK_Data_8: switch (Modifier) { default: llvm_unreachable("Unsupported Modifier"); case MCSymbolRefExpr::VK_PPC_TOCBASE: 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; case FK_Data_2: Type = ELF::R_PPC_ADDR16; break; } } 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; } MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS, bool Is64Bit, uint8_t OSABI) { MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI); return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false); }