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and update ELF header e_flags. Currently gathering information such as symbol, section and data is done by collecting it in an MCAssembler object. From MCAssembler and MCAsmLayout objects ELFObjectWriter::WriteObject() forms and streams out the ELF object file. This patch just adds a few members to the MCAssember class to store and access the e_flag settings. It allows for runtime additions to the e_flag by assembler directives. The standalone assembler can get to MCAssembler from getParser().getStreamer().getAssembler(). This patch is the generic infrastructure and will be followed by patches for ARM and Mips for their target specific use. Contributer: Jack Carter git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173882 91177308-0d34-0410-b5e6-96231b3b80d8
155 lines
4.9 KiB
C++
155 lines
4.9 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 MCSymbol;
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class MCValue;
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/// @name Relocation Data
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/// @{
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struct ELFRelocationEntry {
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// Make these big enough for both 32-bit and 64-bit
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uint64_t r_offset;
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int Index;
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unsigned Type;
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const MCSymbol *Symbol;
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uint64_t r_addend;
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const MCFixup *Fixup;
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ELFRelocationEntry()
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: r_offset(0), Index(0), Type(0), Symbol(0), r_addend(0), Fixup(0) {}
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ELFRelocationEntry(uint64_t RelocOffset, int Idx, unsigned RelType,
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const MCSymbol *Sym, uint64_t Addend, const MCFixup &Fixup)
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: r_offset(RelocOffset), Index(Idx), Type(RelType), Symbol(Sym),
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r_addend(Addend), Fixup(&Fixup) {}
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// Support lexicographic sorting.
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bool operator<(const ELFRelocationEntry &RE) const {
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return RE.r_offset < r_offset;
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}
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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::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, bool IsRelocWithSymbol,
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int64_t Addend) const = 0;
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virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm,
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const MCValue &Target,
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const MCFragment &F,
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const MCFixup &Fixup,
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bool IsPCRel) const;
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virtual const MCSymbol *undefinedExplicitRelSym(const MCValue &Target,
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const MCFixup &Fixup,
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bool IsPCRel) const;
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virtual void adjustFixupOffset(const MCFixup &Fixup,
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uint64_t &RelocOffset);
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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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unsigned getRType(uint32_t Type) const {
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return (unsigned)((Type >> R_TYPE_SHIFT) & 0xff);
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}
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unsigned getRType2(uint32_t Type) const {
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return (unsigned)((Type >> R_TYPE2_SHIFT) & 0xff);
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}
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unsigned getRType3(uint32_t Type) const {
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return (unsigned)((Type >> R_TYPE3_SHIFT) & 0xff);
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}
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unsigned 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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