191 lines
7.4 KiB
C++
191 lines
7.4 KiB
C++
//===-- RuntimeDyldELF.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// ELF support for MC-JIT runtime dynamic linker.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H
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#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H
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#include "RuntimeDyldImpl.h"
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#include "llvm/ADT/DenseMap.h"
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using namespace llvm;
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namespace llvm {
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namespace object {
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class ELFObjectFileBase;
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}
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class RuntimeDyldELF : public RuntimeDyldImpl {
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void resolveRelocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend,
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uint64_t SymOffset = 0, SID SectionID = 0);
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void resolveX86_64Relocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend,
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uint64_t SymOffset);
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void resolveX86Relocation(const SectionEntry &Section, uint64_t Offset,
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uint32_t Value, uint32_t Type, int32_t Addend);
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void resolveAArch64Relocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend);
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bool resolveAArch64ShortBranch(unsigned SectionID, relocation_iterator RelI,
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const RelocationValueRef &Value);
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void resolveAArch64Branch(unsigned SectionID, const RelocationValueRef &Value,
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relocation_iterator RelI, StubMap &Stubs);
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void resolveARMRelocation(const SectionEntry &Section, uint64_t Offset,
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uint32_t Value, uint32_t Type, int32_t Addend);
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void resolvePPC32Relocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend);
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void resolvePPC64Relocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend);
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void resolveSystemZRelocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend);
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void resolveBPFRelocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend);
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unsigned getMaxStubSize() const override {
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if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be)
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return 20; // movz; movk; movk; movk; br
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if (Arch == Triple::arm || Arch == Triple::thumb)
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return 8; // 32-bit instruction and 32-bit address
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else if (IsMipsO32ABI || IsMipsN32ABI)
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return 16;
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else if (IsMipsN64ABI)
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return 32;
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else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le)
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return 44;
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else if (Arch == Triple::x86_64)
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return 6; // 2-byte jmp instruction + 32-bit relative address
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else if (Arch == Triple::systemz)
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return 16;
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else
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return 0;
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}
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unsigned getStubAlignment() override {
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if (Arch == Triple::systemz)
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return 8;
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else
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return 1;
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}
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void setMipsABI(const ObjectFile &Obj) override;
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Error findPPC64TOCSection(const object::ELFObjectFileBase &Obj,
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ObjSectionToIDMap &LocalSections,
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RelocationValueRef &Rel);
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Error findOPDEntrySection(const object::ELFObjectFileBase &Obj,
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ObjSectionToIDMap &LocalSections,
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RelocationValueRef &Rel);
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protected:
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size_t getGOTEntrySize() override;
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private:
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SectionEntry &getSection(unsigned SectionID) { return Sections[SectionID]; }
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// Allocate no GOT entries for use in the given section.
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uint64_t allocateGOTEntries(unsigned no);
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// Find GOT entry corresponding to relocation or create new one.
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uint64_t findOrAllocGOTEntry(const RelocationValueRef &Value,
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unsigned GOTRelType);
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// Resolve the relvative address of GOTOffset in Section ID and place
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// it at the given Offset
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void resolveGOTOffsetRelocation(unsigned SectionID, uint64_t Offset,
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uint64_t GOTOffset, uint32_t Type);
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// For a GOT entry referenced from SectionID, compute a relocation entry
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// that will place the final resolved value in the GOT slot
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RelocationEntry computeGOTOffsetRE(uint64_t GOTOffset, uint64_t SymbolOffset,
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unsigned Type);
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// Compute the address in memory where we can find the placeholder
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void *computePlaceholderAddress(unsigned SectionID, uint64_t Offset) const;
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// Split out common case for createing the RelocationEntry for when the relocation requires
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// no particular advanced processing.
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void processSimpleRelocation(unsigned SectionID, uint64_t Offset, unsigned RelType, RelocationValueRef Value);
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// Return matching *LO16 relocation (Mips specific)
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uint32_t getMatchingLoRelocation(uint32_t RelType,
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bool IsLocal = false) const;
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// The tentative ID for the GOT section
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unsigned GOTSectionID;
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// Records the current number of allocated slots in the GOT
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// (This would be equivalent to GOTEntries.size() were it not for relocations
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// that consume more than one slot)
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unsigned CurrentGOTIndex;
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protected:
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// A map from section to a GOT section that has entries for section's GOT
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// relocations. (Mips64 specific)
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DenseMap<SID, SID> SectionToGOTMap;
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private:
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// A map to avoid duplicate got entries (Mips64 specific)
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StringMap<uint64_t> GOTSymbolOffsets;
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// *HI16 relocations will be added for resolving when we find matching
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// *LO16 part. (Mips specific)
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SmallVector<std::pair<RelocationValueRef, RelocationEntry>, 8> PendingRelocs;
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// When a module is loaded we save the SectionID of the EH frame section
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// in a table until we receive a request to register all unregistered
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// EH frame sections with the memory manager.
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SmallVector<SID, 2> UnregisteredEHFrameSections;
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// Map between GOT relocation value and corresponding GOT offset
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std::map<RelocationValueRef, uint64_t> GOTOffsetMap;
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bool relocationNeedsGot(const RelocationRef &R) const override;
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bool relocationNeedsStub(const RelocationRef &R) const override;
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public:
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RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr,
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JITSymbolResolver &Resolver);
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~RuntimeDyldELF() override;
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static std::unique_ptr<RuntimeDyldELF>
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create(Triple::ArchType Arch, RuntimeDyld::MemoryManager &MemMgr,
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JITSymbolResolver &Resolver);
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std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
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loadObject(const object::ObjectFile &O) override;
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void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override;
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Expected<relocation_iterator>
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processRelocationRef(unsigned SectionID, relocation_iterator RelI,
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const ObjectFile &Obj,
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ObjSectionToIDMap &ObjSectionToID,
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StubMap &Stubs) override;
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bool isCompatibleFile(const object::ObjectFile &Obj) const override;
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void registerEHFrames() override;
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Error finalizeLoad(const ObjectFile &Obj,
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ObjSectionToIDMap &SectionMap) override;
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};
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} // end namespace llvm
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#endif
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