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//===- 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 <memory>
namespace lld {
namespace elf2 {
class SymbolBody;
class TargetInfo {
public:
unsigned getPageSize() const { return PageSize; }
uint64_t getVAStart() const { return VAStart; }
unsigned getPCRelReloc() const { return PCRelReloc; }
unsigned getGotReloc() const { return GotReloc; }
unsigned getGotRefReloc() const { return GotRefReloc; }
unsigned getRelativeReloc() const { return RelativeReloc; }
unsigned getPltEntrySize() const { return PltEntrySize; }
virtual unsigned getPLTRefReloc(unsigned Type) const;
virtual void writePltEntry(uint8_t *Buf, uint64_t GotEntryAddr,
uint64_t PltEntryAddr) const = 0;
virtual bool isRelRelative(uint32_t Type) 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 *Buf, uint8_t *BufEnd, const void *RelP,
uint32_t Type, uint64_t BaseAddr,
uint64_t SymVA) 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 PCRelReloc;
unsigned GotRefReloc;
unsigned GotReloc;
unsigned RelativeReloc;
unsigned PltEntrySize = 8;
};
uint64_t getPPC64TocBase();
extern std::unique_ptr<TargetInfo> Target;
TargetInfo *createTarget();
}
}
#endif
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