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01b026b023
Some targets (ie. Mips) have additional rules for ordering the relocation table entries. Allow them to override generic sortRelocs(), which sorts entries by Offset. Then override this function for Mips, to emit HI16 and GOT16 relocations against the local symbol in pair with the corresponding LO16 relocation. Patch by Vladimir Stefanovic. Differential Revision: http://reviews.llvm.org/D7414 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234883 91177308-0d34-0410-b5e6-96231b3b80d8
137 lines
4.2 KiB
C++
137 lines
4.2 KiB
C++
//===-- llvm/MC/MCELFObjectWriter.h - ELF Object Writer ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCELFOBJECTWRITER_H
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#define LLVM_MC_MCELFOBJECTWRITER_H
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#include "llvm/ADT/Triple.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/ELF.h"
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#include <vector>
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namespace llvm {
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class MCAssembler;
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class MCFixup;
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class MCFragment;
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class MCObjectWriter;
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class MCSectionData;
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class MCSymbol;
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class MCSymbolData;
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class MCValue;
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struct ELFRelocationEntry {
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uint64_t Offset; // Where is the relocation.
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const MCSymbol *Symbol; // The symbol to relocate with.
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unsigned Type; // The type of the relocation.
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uint64_t Addend; // The addend to use.
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ELFRelocationEntry(uint64_t Offset, const MCSymbol *Symbol, unsigned Type,
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uint64_t Addend)
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: Offset(Offset), Symbol(Symbol), Type(Type), Addend(Addend) {}
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};
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class MCELFObjectTargetWriter {
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const uint8_t OSABI;
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const uint16_t EMachine;
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const unsigned HasRelocationAddend : 1;
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const unsigned Is64Bit : 1;
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const unsigned IsN64 : 1;
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protected:
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MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_,
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uint16_t EMachine_, bool HasRelocationAddend,
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bool IsN64=false);
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public:
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static uint8_t getOSABI(Triple::OSType OSType) {
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switch (OSType) {
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case Triple::CloudABI:
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return ELF::ELFOSABI_CLOUDABI;
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case Triple::PS4:
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case Triple::FreeBSD:
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return ELF::ELFOSABI_FREEBSD;
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case Triple::Linux:
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return ELF::ELFOSABI_LINUX;
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default:
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return ELF::ELFOSABI_NONE;
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}
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}
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virtual ~MCELFObjectTargetWriter() {}
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virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
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bool IsPCRel) const = 0;
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virtual bool needsRelocateWithSymbol(const MCSymbolData &SD,
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unsigned Type) const;
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virtual void sortRelocs(const MCAssembler &Asm,
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std::vector<ELFRelocationEntry> &Relocs);
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/// @name Accessors
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/// @{
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uint8_t getOSABI() const { return OSABI; }
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uint16_t getEMachine() const { return EMachine; }
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bool hasRelocationAddend() const { return HasRelocationAddend; }
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bool is64Bit() const { return Is64Bit; }
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bool isN64() const { return IsN64; }
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/// @}
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// Instead of changing everyone's API we pack the N64 Type fields
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// into the existing 32 bit data unsigned.
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#define R_TYPE_SHIFT 0
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#define R_TYPE_MASK 0xffffff00
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#define R_TYPE2_SHIFT 8
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#define R_TYPE2_MASK 0xffff00ff
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#define R_TYPE3_SHIFT 16
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#define R_TYPE3_MASK 0xff00ffff
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#define R_SSYM_SHIFT 24
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#define R_SSYM_MASK 0x00ffffff
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// N64 relocation type accessors
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uint8_t getRType(uint32_t Type) const {
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return (unsigned)((Type >> R_TYPE_SHIFT) & 0xff);
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}
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uint8_t getRType2(uint32_t Type) const {
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return (unsigned)((Type >> R_TYPE2_SHIFT) & 0xff);
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}
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uint8_t getRType3(uint32_t Type) const {
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return (unsigned)((Type >> R_TYPE3_SHIFT) & 0xff);
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}
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uint8_t getRSsym(uint32_t Type) const {
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return (unsigned)((Type >> R_SSYM_SHIFT) & 0xff);
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}
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// N64 relocation type setting
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unsigned setRType(unsigned Value, unsigned Type) const {
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return ((Type & R_TYPE_MASK) | ((Value & 0xff) << R_TYPE_SHIFT));
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}
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unsigned setRType2(unsigned Value, unsigned Type) const {
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return (Type & R_TYPE2_MASK) | ((Value & 0xff) << R_TYPE2_SHIFT);
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}
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unsigned setRType3(unsigned Value, unsigned Type) const {
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return (Type & R_TYPE3_MASK) | ((Value & 0xff) << R_TYPE3_SHIFT);
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}
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unsigned setRSsym(unsigned Value, unsigned Type) const {
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return (Type & R_SSYM_MASK) | ((Value & 0xff) << R_SSYM_SHIFT);
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}
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};
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/// \brief Construct a new ELF writer instance.
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///
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/// \param MOTW - The target specific ELF writer subclass.
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/// \param OS - The stream to write to.
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/// \returns The constructed object writer.
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MCObjectWriter *createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
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raw_ostream &OS, bool IsLittleEndian);
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} // End llvm namespace
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#endif
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