/usr/include/llvm-3.9/llvm/MC/MCELFObjectWriter.h is in llvm-3.9-dev 1:3.9.1-19ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | //===-- llvm/MC/MCELFObjectWriter.h - ELF Object Writer ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCELFOBJECTWRITER_H
#define LLVM_MC_MCELFOBJECTWRITER_H
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/raw_ostream.h"
#include <vector>
namespace llvm {
class MCAssembler;
class MCContext;
class MCFixup;
class MCFragment;
class MCObjectWriter;
class MCSymbol;
class MCSymbolELF;
class MCValue;
class raw_pwrite_stream;
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 {
const uint8_t OSABI;
const uint16_t EMachine;
const unsigned HasRelocationAddend : 1;
const unsigned Is64Bit : 1;
const unsigned IsN64 : 1;
protected:
MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_,
uint16_t EMachine_, bool HasRelocationAddend,
bool IsN64=false);
public:
static uint8_t getOSABI(Triple::OSType OSType) {
switch (OSType) {
case Triple::CloudABI:
return ELF::ELFOSABI_CLOUDABI;
case Triple::PS4:
case Triple::FreeBSD:
return ELF::ELFOSABI_FREEBSD;
default:
return ELF::ELFOSABI_NONE;
}
}
virtual ~MCELFObjectTargetWriter() {}
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);
/// \name Accessors
/// @{
uint8_t getOSABI() const { return OSABI; }
uint16_t getEMachine() const { return EMachine; }
bool hasRelocationAddend() const { return HasRelocationAddend; }
bool is64Bit() const { return Is64Bit; }
bool isN64() const { return IsN64; }
/// @}
// 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);
}
};
/// \brief 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.
MCObjectWriter *createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
raw_pwrite_stream &OS,
bool IsLittleEndian);
} // End llvm namespace
#endif
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