forked from OSchip/llvm-project
121 lines
4.3 KiB
C++
121 lines
4.3 KiB
C++
//===- Target.h -------------------------------------------------*- C++ -*-===//
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//
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// The LLVM Linker
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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 LLD_ELF_TARGET_H
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#define LLD_ELF_TARGET_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Object/ELF.h"
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#include <memory>
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namespace lld {
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namespace elf2 {
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class SymbolBody;
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class TargetInfo {
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public:
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uint64_t getVAStart() const;
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bool isTlsLocalDynamicReloc(unsigned Type) const {
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return Type == TlsLocalDynamicRel;
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}
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bool isTlsGlobalDynamicReloc(unsigned Type) const {
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return Type == TlsGlobalDynamicRel;
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}
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virtual unsigned getDynReloc(unsigned Type) const { return Type; }
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virtual bool isTlsDynReloc(unsigned Type, const SymbolBody &S) const {
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return false;
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}
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virtual unsigned getTlsGotRel(unsigned Type = -1) const { return TlsGotRel; }
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virtual void writeGotHeaderEntries(uint8_t *Buf) const;
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virtual void writeGotPltHeaderEntries(uint8_t *Buf) const;
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virtual void writeGotPltEntry(uint8_t *Buf, uint64_t Plt) const = 0;
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virtual void writePltZeroEntry(uint8_t *Buf, uint64_t GotEntryAddr,
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uint64_t PltEntryAddr) const = 0;
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virtual void writePltEntry(uint8_t *Buf, uint64_t GotAddr,
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uint64_t GotEntryAddr, uint64_t PltEntryAddr,
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int32_t Index, unsigned RelOff) const = 0;
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// Returns true if a relocation is just a hint for linker to make for example
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// some code optimization. Such relocations should not be handled as a regular
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// ones and lead to dynamic relocation creation etc.
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virtual bool isHintReloc(uint32_t Type) const;
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// Returns true if a relocation is relative to the place being relocated,
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// such as relocations used for PC-relative instructions. Such relocations
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// need not be fixed up if an image is loaded to a different address than
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// the link-time address. So we don't have to emit a relocation for the
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// dynamic linker if isRelRelative returns true.
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virtual bool isRelRelative(uint32_t Type) const;
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virtual bool isSizeReloc(uint32_t Type) const;
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virtual bool relocNeedsDynRelative(unsigned Type) const { return false; }
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virtual bool relocNeedsGot(uint32_t Type, const SymbolBody &S) const = 0;
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virtual bool relocNeedsPlt(uint32_t Type, const SymbolBody &S) const = 0;
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virtual void relocateOne(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type,
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uint64_t P, uint64_t SA, uint64_t ZA = 0,
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uint8_t *PairedLoc = nullptr) const = 0;
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virtual bool isGotRelative(uint32_t Type) const;
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virtual bool canRelaxTls(unsigned Type, const SymbolBody *S) const;
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virtual bool needsCopyRel(uint32_t Type, const SymbolBody &S) const;
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virtual unsigned relocateTlsOptimize(uint8_t *Loc, uint8_t *BufEnd,
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uint32_t Type, uint64_t P, uint64_t SA,
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const SymbolBody *S) const;
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virtual ~TargetInfo();
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unsigned PageSize = 4096;
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// On freebsd x86_64 the first page cannot be mmaped.
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// On linux that is controled by vm.mmap_min_addr. At least on some x86_64
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// installs that is 65536, so the first 15 pages cannot be used.
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// Given that, the smallest value that can be used in here is 0x10000.
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// If using 2MB pages, the smallest page aligned address that works is
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// 0x200000, but it looks like every OS uses 4k pages for executables.
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uint64_t VAStart = 0x10000;
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unsigned CopyRel;
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unsigned GotRel;
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unsigned PltRel;
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unsigned RelativeRel;
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unsigned IRelativeRel;
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unsigned TlsGotRel = 0;
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unsigned TlsLocalDynamicRel = 0;
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unsigned TlsGlobalDynamicRel = 0;
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unsigned TlsModuleIndexRel;
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unsigned TlsOffsetRel;
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unsigned PltEntrySize = 8;
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unsigned PltZeroEntrySize = 0;
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unsigned GotHeaderEntriesNum = 0;
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unsigned GotPltHeaderEntriesNum = 3;
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bool UseLazyBinding = false;
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};
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uint64_t getPPC64TocBase();
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template <class ELFT>
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typename llvm::object::ELFFile<ELFT>::uintX_t getMipsGpAddr();
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// Returns true if the relocation requires entry in the local part of GOT.
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bool needsMipsLocalGot(uint32_t Type, SymbolBody *Body);
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template <class ELFT> bool isGnuIFunc(const SymbolBody &S);
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extern std::unique_ptr<TargetInfo> Target;
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TargetInfo *createTarget();
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}
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}
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#endif
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