mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-31 08:16:47 +00:00
224dbf4aec
I started trying to fix a small issue, but this code has seen a small fix too many. The old code was fairly convoluted. Some of the issues it had: * It failed to check if a symbol difference was in the some section when converting a relocation to pcrel. * It failed to check if the relocation was already pcrel. * The pcrel value computation was wrong in some cases (relocation-pc.s) * It was missing quiet a few cases where it should not convert symbol relocations to section relocations, leaving the backends to patch it up. * It would not propagate the fact that it had changed a relocation to pcrel, requiring a quiet nasty work around in ARM. * It was missing comments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205076 91177308-0d34-0410-b5e6-96231b3b80d8
118 lines
3.5 KiB
C++
118 lines
3.5 KiB
C++
//===-- 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/Support/DataTypes.h"
|
|
#include "llvm/Support/ELF.h"
|
|
#include <vector>
|
|
|
|
namespace llvm {
|
|
class MCAssembler;
|
|
class MCFixup;
|
|
class MCFragment;
|
|
class MCObjectWriter;
|
|
class MCSectionData;
|
|
class MCSymbol;
|
|
class MCValue;
|
|
|
|
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::FreeBSD:
|
|
return ELF::ELFOSABI_FREEBSD;
|
|
case Triple::Linux:
|
|
return ELF::ELFOSABI_LINUX;
|
|
default:
|
|
return ELF::ELFOSABI_NONE;
|
|
}
|
|
}
|
|
|
|
virtual ~MCELFObjectTargetWriter() {}
|
|
|
|
virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
|
|
bool IsPCRel) const = 0;
|
|
|
|
virtual bool needsRelocateWithSymbol(unsigned Type) const;
|
|
|
|
/// @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_ostream &OS, bool IsLittleEndian);
|
|
} // End llvm namespace
|
|
|
|
#endif
|