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Diffstat (limited to 'clang-r353983e/include/llvm/MC/MCELFObjectWriter.h')
| -rw-r--r-- | clang-r353983e/include/llvm/MC/MCELFObjectWriter.h | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/clang-r353983e/include/llvm/MC/MCELFObjectWriter.h b/clang-r353983e/include/llvm/MC/MCELFObjectWriter.h new file mode 100644 index 00000000..9ff7011d --- /dev/null +++ b/clang-r353983e/include/llvm/MC/MCELFObjectWriter.h @@ -0,0 +1,161 @@ +//===- llvm/MC/MCELFObjectWriter.h - ELF Object Writer ----------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_MC_MCELFOBJECTWRITER_H +#define LLVM_MC_MCELFOBJECTWRITER_H + +#include "llvm/ADT/Triple.h" +#include "llvm/BinaryFormat/ELF.h" +#include "llvm/MC/MCObjectWriter.h" +#include "llvm/MC/MCSectionELF.h" +#include "llvm/Support/Casting.h" +#include "llvm/Support/raw_ostream.h" +#include <cstdint> +#include <vector> + +namespace llvm { + +class MCAssembler; +class MCContext; +class MCFixup; +class MCObjectWriter; +class MCSymbol; +class MCSymbolELF; +class MCValue; + +struct ELFRelocationEntry { + uint64_t Offset; // Where is the relocation. + const MCSymbolELF *Symbol; // The symbol to relocate with. + unsigned Type; // The type of the relocation. + uint64_t Addend; // The addend to use. + const MCSymbolELF *OriginalSymbol; // The original value of Symbol if we changed it. + uint64_t OriginalAddend; // The original value of addend. + + ELFRelocationEntry(uint64_t Offset, const MCSymbolELF *Symbol, unsigned Type, + uint64_t Addend, const MCSymbolELF *OriginalSymbol, + uint64_t OriginalAddend) + : Offset(Offset), Symbol(Symbol), Type(Type), Addend(Addend), + OriginalSymbol(OriginalSymbol), OriginalAddend(OriginalAddend) {} + + void print(raw_ostream &Out) const { + Out << "Off=" << Offset << ", Sym=" << Symbol << ", Type=" << Type + << ", Addend=" << Addend << ", OriginalSymbol=" << OriginalSymbol + << ", OriginalAddend=" << OriginalAddend; + } + + void dump() const { print(errs()); } +}; + +class MCELFObjectTargetWriter : public MCObjectTargetWriter { + const uint8_t OSABI; + const uint16_t EMachine; + const unsigned HasRelocationAddend : 1; + const unsigned Is64Bit : 1; + +protected: + MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_, uint16_t EMachine_, + bool HasRelocationAddend); + +public: + virtual ~MCELFObjectTargetWriter() = default; + + virtual Triple::ObjectFormatType getFormat() const { return Triple::ELF; } + static bool classof(const MCObjectTargetWriter *W) { + return W->getFormat() == Triple::ELF; + } + + static uint8_t getOSABI(Triple::OSType OSType) { + switch (OSType) { + case Triple::CloudABI: + return ELF::ELFOSABI_CLOUDABI; + case Triple::HermitCore: + return ELF::ELFOSABI_STANDALONE; + case Triple::PS4: + case Triple::FreeBSD: + return ELF::ELFOSABI_FREEBSD; + default: + return ELF::ELFOSABI_NONE; + } + } + + virtual unsigned getRelocType(MCContext &Ctx, const MCValue &Target, + const MCFixup &Fixup, bool IsPCRel) const = 0; + + virtual bool needsRelocateWithSymbol(const MCSymbol &Sym, + unsigned Type) const; + + virtual void sortRelocs(const MCAssembler &Asm, + std::vector<ELFRelocationEntry> &Relocs); + + virtual void addTargetSectionFlags(MCContext &Ctx, MCSectionELF &Sec); + + /// \name Accessors + /// @{ + uint8_t getOSABI() const { return OSABI; } + uint16_t getEMachine() const { return EMachine; } + bool hasRelocationAddend() const { return HasRelocationAddend; } + bool is64Bit() const { return Is64Bit; } + /// @} + + // Instead of changing everyone's API we pack the N64 Type fields + // into the existing 32 bit data unsigned. +#define R_TYPE_SHIFT 0 +#define R_TYPE_MASK 0xffffff00 +#define R_TYPE2_SHIFT 8 +#define R_TYPE2_MASK 0xffff00ff +#define R_TYPE3_SHIFT 16 +#define R_TYPE3_MASK 0xff00ffff +#define R_SSYM_SHIFT 24 +#define R_SSYM_MASK 0x00ffffff + + // N64 relocation type accessors + uint8_t getRType(uint32_t Type) const { + return (unsigned)((Type >> R_TYPE_SHIFT) & 0xff); + } + uint8_t getRType2(uint32_t Type) const { + return (unsigned)((Type >> R_TYPE2_SHIFT) & 0xff); + } + uint8_t getRType3(uint32_t Type) const { + return (unsigned)((Type >> R_TYPE3_SHIFT) & 0xff); + } + uint8_t getRSsym(uint32_t Type) const { + return (unsigned)((Type >> R_SSYM_SHIFT) & 0xff); + } + + // N64 relocation type setting + unsigned setRType(unsigned Value, unsigned Type) const { + return ((Type & R_TYPE_MASK) | ((Value & 0xff) << R_TYPE_SHIFT)); + } + unsigned setRType2(unsigned Value, unsigned Type) const { + return (Type & R_TYPE2_MASK) | ((Value & 0xff) << R_TYPE2_SHIFT); + } + unsigned setRType3(unsigned Value, unsigned Type) const { + return (Type & R_TYPE3_MASK) | ((Value & 0xff) << R_TYPE3_SHIFT); + } + unsigned setRSsym(unsigned Value, unsigned Type) const { + return (Type & R_SSYM_MASK) | ((Value & 0xff) << R_SSYM_SHIFT); + } +}; + +/// Construct a new ELF writer instance. +/// +/// \param MOTW - The target specific ELF writer subclass. +/// \param OS - The stream to write to. +/// \returns The constructed object writer. +std::unique_ptr<MCObjectWriter> +createELFObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW, + raw_pwrite_stream &OS, bool IsLittleEndian); + +std::unique_ptr<MCObjectWriter> +createELFDwoObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW, + raw_pwrite_stream &OS, raw_pwrite_stream &DwoOS, + bool IsLittleEndian); + +} // end namespace llvm + +#endif // LLVM_MC_MCELFOBJECTWRITER_H |