forked from OSchip/llvm-project
106 lines
3.9 KiB
C++
106 lines
3.9 KiB
C++
//===- Target.h -------------------------------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Linker
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLD_ELF_TARGET_H
|
|
#define LLD_ELF_TARGET_H
|
|
|
|
#include "llvm/ADT/StringRef.h"
|
|
#include "llvm/Object/ELF.h"
|
|
|
|
#include <memory>
|
|
|
|
namespace lld {
|
|
namespace elf2 {
|
|
class SymbolBody;
|
|
|
|
class TargetInfo {
|
|
public:
|
|
unsigned getPageSize() const { return PageSize; }
|
|
uint64_t getVAStart() const;
|
|
unsigned getCopyReloc() const { return CopyReloc; }
|
|
unsigned getPCRelReloc() const { return PCRelReloc; }
|
|
unsigned getGotReloc() const { return GotReloc; }
|
|
unsigned getPltReloc() const { return PltReloc; }
|
|
unsigned getGotRefReloc() const { return GotRefReloc; }
|
|
unsigned getRelativeReloc() const { return RelativeReloc; }
|
|
unsigned getTlsGotReloc() const { return TlsGotReloc; }
|
|
unsigned getTlsPcRelGotReloc() const { return TlsPcRelGotReloc; }
|
|
bool isTlsLocalDynamicReloc(unsigned Type) const {
|
|
return Type == TlsLocalDynamicReloc;
|
|
}
|
|
bool isTlsGlobalDynamicReloc(unsigned Type) const {
|
|
return Type == TlsGlobalDynamicReloc;
|
|
}
|
|
unsigned getTlsModuleIndexReloc() const { return TlsModuleIndexReloc; }
|
|
unsigned getTlsOffsetReloc() const { return TlsOffsetReloc; }
|
|
unsigned getPltZeroEntrySize() const { return PltZeroEntrySize; }
|
|
unsigned getPltEntrySize() const { return PltEntrySize; }
|
|
bool supportsLazyRelocations() const { return LazyRelocations; }
|
|
unsigned getGotHeaderEntriesNum() const { return GotHeaderEntriesNum; }
|
|
unsigned getGotPltHeaderEntriesNum() const { return GotPltHeaderEntriesNum; }
|
|
virtual unsigned getPltRefReloc(unsigned Type) const;
|
|
virtual void writeGotHeaderEntries(uint8_t *Buf) const;
|
|
virtual void writeGotPltHeaderEntries(uint8_t *Buf) const;
|
|
virtual void writeGotPltEntry(uint8_t *Buf, uint64_t Plt) const = 0;
|
|
virtual void writePltZeroEntry(uint8_t *Buf, uint64_t GotEntryAddr,
|
|
uint64_t PltEntryAddr) const = 0;
|
|
virtual void writePltEntry(uint8_t *Buf, uint64_t GotEntryAddr,
|
|
uint64_t PltEntryAddr, int32_t Index) const = 0;
|
|
virtual bool isRelRelative(uint32_t Type) const;
|
|
virtual bool relocNeedsCopy(uint32_t Type, const SymbolBody &S) const;
|
|
virtual bool relocNeedsGot(uint32_t Type, const SymbolBody &S) const = 0;
|
|
virtual bool relocPointsToGot(uint32_t Type) const;
|
|
virtual bool relocNeedsPlt(uint32_t Type, const SymbolBody &S) const = 0;
|
|
virtual void relocateOne(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type,
|
|
uint64_t P, uint64_t SA) const = 0;
|
|
|
|
virtual ~TargetInfo();
|
|
|
|
protected:
|
|
unsigned PageSize = 4096;
|
|
|
|
// On freebsd x86_64 the first page cannot be mmaped.
|
|
// On linux that is controled by vm.mmap_min_addr. At least on some x86_64
|
|
// installs that is 65536, so the first 15 pages cannot be used.
|
|
// Given that, the smallest value that can be used in here is 0x10000.
|
|
// If using 2MB pages, the smallest page aligned address that works is
|
|
// 0x200000, but it looks like every OS uses 4k pages for executables.
|
|
uint64_t VAStart = 0x10000;
|
|
|
|
unsigned CopyReloc;
|
|
unsigned PCRelReloc;
|
|
unsigned GotRefReloc;
|
|
unsigned GotReloc;
|
|
unsigned PltReloc;
|
|
unsigned RelativeReloc;
|
|
unsigned TlsGotReloc = 0;
|
|
unsigned TlsLocalDynamicReloc = 0;
|
|
unsigned TlsGlobalDynamicReloc = 0;
|
|
unsigned TlsModuleIndexReloc;
|
|
unsigned TlsOffsetReloc;
|
|
unsigned TlsPcRelGotReloc = 0;
|
|
unsigned PltEntrySize = 8;
|
|
unsigned PltZeroEntrySize = 0;
|
|
unsigned GotHeaderEntriesNum = 0;
|
|
unsigned GotPltHeaderEntriesNum = 3;
|
|
bool LazyRelocations = false;
|
|
};
|
|
|
|
uint64_t getPPC64TocBase();
|
|
|
|
template <class ELFT>
|
|
typename llvm::object::ELFFile<ELFT>::uintX_t getMipsGpAddr();
|
|
|
|
extern std::unique_ptr<TargetInfo> Target;
|
|
TargetInfo *createTarget();
|
|
}
|
|
}
|
|
|
|
#endif
|