220 lines
8.1 KiB
C++
220 lines
8.1 KiB
C++
//===-- RuntimeDyldCOFFX86_64.h --- COFF/X86_64 specific code ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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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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//
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// COFF x86_x64 support for MC-JIT runtime dynamic linker.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDCOFF86_64_H
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#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDCOFF86_64_H
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#include "llvm/Object/COFF.h"
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#include "llvm/Support/COFF.h"
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#include "../RuntimeDyldCOFF.h"
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#define DEBUG_TYPE "dyld"
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namespace llvm {
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class RuntimeDyldCOFFX86_64 : public RuntimeDyldCOFF {
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private:
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// When a module is loaded we save the SectionID of the unwind
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// sections in a table until we receive a request to register all
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// unregisteredEH frame sections with the memory manager.
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SmallVector<SID, 2> UnregisteredEHFrameSections;
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SmallVector<SID, 2> RegisteredEHFrameSections;
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public:
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RuntimeDyldCOFFX86_64(RuntimeDyld::MemoryManager &MM,
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JITSymbolResolver &Resolver)
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: RuntimeDyldCOFF(MM, Resolver) {}
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unsigned getMaxStubSize() override {
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return 6; // 2-byte jmp instruction + 32-bit relative address
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}
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// The target location for the relocation is described by RE.SectionID and
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// RE.Offset. RE.SectionID can be used to find the SectionEntry. Each
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// SectionEntry has three members describing its location.
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// SectionEntry::Address is the address at which the section has been loaded
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// into memory in the current (host) process. SectionEntry::LoadAddress is
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// the address that the section will have in the target process.
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// SectionEntry::ObjAddress is the address of the bits for this section in the
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// original emitted object image (also in the current address space).
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//
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// Relocations will be applied as if the section were loaded at
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// SectionEntry::LoadAddress, but they will be applied at an address based
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// on SectionEntry::Address. SectionEntry::ObjAddress will be used to refer
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// to Target memory contents if they are required for value calculations.
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//
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// The Value parameter here is the load address of the symbol for the
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// relocation to be applied. For relocations which refer to symbols in the
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// current object Value will be the LoadAddress of the section in which
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// the symbol resides (RE.Addend provides additional information about the
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// symbol location). For external symbols, Value will be the address of the
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// symbol in the target address space.
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void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override {
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const SectionEntry &Section = Sections[RE.SectionID];
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uint8_t *Target = Section.getAddressWithOffset(RE.Offset);
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switch (RE.RelType) {
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case COFF::IMAGE_REL_AMD64_REL32:
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case COFF::IMAGE_REL_AMD64_REL32_1:
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case COFF::IMAGE_REL_AMD64_REL32_2:
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case COFF::IMAGE_REL_AMD64_REL32_3:
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case COFF::IMAGE_REL_AMD64_REL32_4:
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case COFF::IMAGE_REL_AMD64_REL32_5: {
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uint64_t FinalAddress = Section.getLoadAddressWithOffset(RE.Offset);
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// Delta is the distance from the start of the reloc to the end of the
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// instruction with the reloc.
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uint64_t Delta = 4 + (RE.RelType - COFF::IMAGE_REL_AMD64_REL32);
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Value -= FinalAddress + Delta;
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uint64_t Result = Value + RE.Addend;
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assert(((int64_t)Result <= INT32_MAX) && "Relocation overflow");
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assert(((int64_t)Result >= INT32_MIN) && "Relocation underflow");
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writeBytesUnaligned(Result, Target, 4);
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break;
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}
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case COFF::IMAGE_REL_AMD64_ADDR32NB: {
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// Note ADDR32NB requires a well-established notion of
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// image base. This address must be less than or equal
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// to every section's load address, and all sections must be
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// within a 32 bit offset from the base.
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//
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// For now we just set these to zero.
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writeBytesUnaligned(0, Target, 4);
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break;
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}
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case COFF::IMAGE_REL_AMD64_ADDR64: {
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writeBytesUnaligned(Value + RE.Addend, Target, 8);
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break;
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}
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default:
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llvm_unreachable("Relocation type not implemented yet!");
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break;
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}
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}
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Expected<relocation_iterator>
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processRelocationRef(unsigned SectionID,
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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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// If possible, find the symbol referred to in the relocation,
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// and the section that contains it.
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symbol_iterator Symbol = RelI->getSymbol();
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if (Symbol == Obj.symbol_end())
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report_fatal_error("Unknown symbol in relocation");
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auto SectionOrError = Symbol->getSection();
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if (!SectionOrError)
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return SectionOrError.takeError();
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section_iterator SecI = *SectionOrError;
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// If there is no section, this must be an external reference.
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const bool IsExtern = SecI == Obj.section_end();
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// Determine the Addend used to adjust the relocation value.
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uint64_t RelType = RelI->getType();
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uint64_t Offset = RelI->getOffset();
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uint64_t Addend = 0;
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SectionEntry &Section = Sections[SectionID];
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uintptr_t ObjTarget = Section.getObjAddress() + Offset;
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switch (RelType) {
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case COFF::IMAGE_REL_AMD64_REL32:
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case COFF::IMAGE_REL_AMD64_REL32_1:
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case COFF::IMAGE_REL_AMD64_REL32_2:
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case COFF::IMAGE_REL_AMD64_REL32_3:
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case COFF::IMAGE_REL_AMD64_REL32_4:
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case COFF::IMAGE_REL_AMD64_REL32_5:
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case COFF::IMAGE_REL_AMD64_ADDR32NB: {
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uint8_t *Displacement = (uint8_t *)ObjTarget;
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Addend = readBytesUnaligned(Displacement, 4);
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break;
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}
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case COFF::IMAGE_REL_AMD64_ADDR64: {
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uint8_t *Displacement = (uint8_t *)ObjTarget;
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Addend = readBytesUnaligned(Displacement, 8);
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break;
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}
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default:
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break;
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}
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Expected<StringRef> TargetNameOrErr = Symbol->getName();
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if (!TargetNameOrErr)
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return TargetNameOrErr.takeError();
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StringRef TargetName = *TargetNameOrErr;
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DEBUG(dbgs() << "\t\tIn Section " << SectionID << " Offset " << Offset
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<< " RelType: " << RelType << " TargetName: " << TargetName
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<< " Addend " << Addend << "\n");
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if (IsExtern) {
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RelocationEntry RE(SectionID, Offset, RelType, Addend);
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addRelocationForSymbol(RE, TargetName);
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} else {
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bool IsCode = SecI->isText();
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unsigned TargetSectionID;
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if (auto TargetSectionIDOrErr =
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findOrEmitSection(Obj, *SecI, IsCode, ObjSectionToID))
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TargetSectionID = *TargetSectionIDOrErr;
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else
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return TargetSectionIDOrErr.takeError();
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uint64_t TargetOffset = getSymbolOffset(*Symbol);
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RelocationEntry RE(SectionID, Offset, RelType, TargetOffset + Addend);
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addRelocationForSection(RE, TargetSectionID);
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}
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return ++RelI;
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}
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unsigned getStubAlignment() override { return 1; }
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void registerEHFrames() override {
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for (auto const &EHFrameSID : UnregisteredEHFrameSections) {
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uint8_t *EHFrameAddr = Sections[EHFrameSID].getAddress();
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uint64_t EHFrameLoadAddr = Sections[EHFrameSID].getLoadAddress();
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size_t EHFrameSize = Sections[EHFrameSID].getSize();
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MemMgr.registerEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
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RegisteredEHFrameSections.push_back(EHFrameSID);
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}
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UnregisteredEHFrameSections.clear();
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}
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Error finalizeLoad(const ObjectFile &Obj,
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ObjSectionToIDMap &SectionMap) override {
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// Look for and record the EH frame section IDs.
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for (const auto &SectionPair : SectionMap) {
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const SectionRef &Section = SectionPair.first;
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StringRef Name;
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if (auto EC = Section.getName(Name))
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return errorCodeToError(EC);
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// Note unwind info is split across .pdata and .xdata, so this
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// may not be sufficiently general for all users.
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if (Name == ".xdata") {
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UnregisteredEHFrameSections.push_back(SectionPair.second);
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}
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}
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return Error::success();
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}
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};
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} // end namespace llvm
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#undef DEBUG_TYPE
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#endif
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