229 lines
8.3 KiB
C
229 lines
8.3 KiB
C
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//===--- RuntimeDyldCOFFI386.h --- COFF/X86_64 specific code ---*- 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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// COFF x86 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_RUNTIMEDYLDCOFFI386_H
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#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDCOFFI386_H
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#include "../RuntimeDyldCOFF.h"
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#include "llvm/BinaryFormat/COFF.h"
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#include "llvm/Object/COFF.h"
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#define DEBUG_TYPE "dyld"
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namespace llvm {
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class RuntimeDyldCOFFI386 : public RuntimeDyldCOFF {
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public:
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RuntimeDyldCOFFI386(RuntimeDyld::MemoryManager &MM,
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JITSymbolResolver &Resolver)
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: RuntimeDyldCOFF(MM, Resolver, 4, COFF::IMAGE_REL_I386_DIR32) {}
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unsigned getMaxStubSize() const override {
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return 8; // 2-byte jmp instruction + 32-bit relative address + 2 byte pad
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}
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unsigned getStubAlignment() override { return 1; }
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Expected<object::relocation_iterator>
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processRelocationRef(unsigned SectionID,
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object::relocation_iterator RelI,
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const object::ObjectFile &Obj,
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ObjSectionToIDMap &ObjSectionToID,
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StubMap &Stubs) override {
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auto 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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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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auto SectionOrErr = Symbol->getSection();
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if (!SectionOrErr)
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return SectionOrErr.takeError();
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auto Section = *SectionOrErr;
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bool IsExtern = Section == Obj.section_end();
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uint64_t RelType = RelI->getType();
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uint64_t Offset = RelI->getOffset();
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unsigned TargetSectionID = -1;
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uint64_t TargetOffset = -1;
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if (TargetName.startswith(getImportSymbolPrefix())) {
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TargetSectionID = SectionID;
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TargetOffset = getDLLImportOffset(SectionID, Stubs, TargetName, true);
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TargetName = StringRef();
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IsExtern = false;
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} else if (!IsExtern) {
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if (auto TargetSectionIDOrErr = findOrEmitSection(
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Obj, *Section, Section->isText(), ObjSectionToID))
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TargetSectionID = *TargetSectionIDOrErr;
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else
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return TargetSectionIDOrErr.takeError();
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if (RelType != COFF::IMAGE_REL_I386_SECTION)
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TargetOffset = getSymbolOffset(*Symbol);
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}
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// Determine the Addend used to adjust the relocation value.
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uint64_t Addend = 0;
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SectionEntry &AddendSection = Sections[SectionID];
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uintptr_t ObjTarget = AddendSection.getObjAddress() + Offset;
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uint8_t *Displacement = (uint8_t *)ObjTarget;
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switch (RelType) {
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case COFF::IMAGE_REL_I386_DIR32:
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case COFF::IMAGE_REL_I386_DIR32NB:
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case COFF::IMAGE_REL_I386_SECREL:
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case COFF::IMAGE_REL_I386_REL32: {
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Addend = readBytesUnaligned(Displacement, 4);
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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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#if !defined(NDEBUG)
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SmallString<32> RelTypeName;
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RelI->getTypeName(RelTypeName);
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#endif
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LLVM_DEBUG(dbgs() << "\t\tIn Section " << SectionID << " Offset " << Offset
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<< " RelType: " << RelTypeName << " TargetName: "
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<< TargetName << " Addend " << Addend << "\n");
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if (IsExtern) {
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RelocationEntry RE(SectionID, Offset, RelType, 0, -1, 0, 0, 0, false, 0);
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addRelocationForSymbol(RE, TargetName);
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} else {
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switch (RelType) {
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case COFF::IMAGE_REL_I386_ABSOLUTE:
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// This relocation is ignored.
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break;
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case COFF::IMAGE_REL_I386_DIR32:
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case COFF::IMAGE_REL_I386_DIR32NB:
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case COFF::IMAGE_REL_I386_REL32: {
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RelocationEntry RE =
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RelocationEntry(SectionID, Offset, RelType, Addend, TargetSectionID,
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TargetOffset, 0, 0, false, 0);
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addRelocationForSection(RE, TargetSectionID);
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break;
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}
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case COFF::IMAGE_REL_I386_SECTION: {
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RelocationEntry RE =
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RelocationEntry(TargetSectionID, Offset, RelType, 0);
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addRelocationForSection(RE, TargetSectionID);
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break;
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}
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case COFF::IMAGE_REL_I386_SECREL: {
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RelocationEntry RE =
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RelocationEntry(SectionID, Offset, RelType, TargetOffset + Addend);
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addRelocationForSection(RE, TargetSectionID);
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break;
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}
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default:
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llvm_unreachable("unsupported relocation type");
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}
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}
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return ++RelI;
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}
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void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override {
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const auto 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_I386_ABSOLUTE:
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// This relocation is ignored.
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break;
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case COFF::IMAGE_REL_I386_DIR32: {
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// The target's 32-bit VA.
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uint64_t Result =
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RE.Sections.SectionA == static_cast<uint32_t>(-1)
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? Value
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: Sections[RE.Sections.SectionA].getLoadAddressWithOffset(
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RE.Addend);
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assert(Result <= UINT32_MAX && "relocation overflow");
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LLVM_DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_I386_DIR32"
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<< " TargetSection: " << RE.Sections.SectionA
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<< " Value: " << format("0x%08" PRIx32, Result)
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<< '\n');
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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_I386_DIR32NB: {
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// The target's 32-bit RVA.
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// NOTE: use Section[0].getLoadAddress() as an approximation of ImageBase
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uint64_t Result =
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Sections[RE.Sections.SectionA].getLoadAddressWithOffset(RE.Addend) -
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Sections[0].getLoadAddress();
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assert(Result <= UINT32_MAX && "relocation overflow");
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LLVM_DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_I386_DIR32NB"
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<< " TargetSection: " << RE.Sections.SectionA
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<< " Value: " << format("0x%08" PRIx32, Result)
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<< '\n');
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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_I386_REL32: {
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// 32-bit relative displacement to the target.
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uint64_t Result = RE.Sections.SectionA == static_cast<uint32_t>(-1)
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? Value
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: Sections[RE.Sections.SectionA].getLoadAddress();
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Result = Result - Section.getLoadAddress() + RE.Addend - 4 - RE.Offset;
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assert(static_cast<int64_t>(Result) <= INT32_MAX &&
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"relocation overflow");
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assert(static_cast<int64_t>(Result) >= INT32_MIN &&
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"relocation underflow");
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LLVM_DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_I386_REL32"
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<< " TargetSection: " << RE.Sections.SectionA
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<< " Value: " << format("0x%08" PRIx32, Result)
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<< '\n');
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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_I386_SECTION:
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// 16-bit section index of the section that contains the target.
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assert(static_cast<uint32_t>(RE.SectionID) <= UINT16_MAX &&
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"relocation overflow");
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LLVM_DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_I386_SECTION Value: "
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<< RE.SectionID << '\n');
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writeBytesUnaligned(RE.SectionID, Target, 2);
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break;
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case COFF::IMAGE_REL_I386_SECREL:
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// 32-bit offset of the target from the beginning of its section.
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assert(static_cast<uint64_t>(RE.Addend) <= UINT32_MAX &&
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"relocation overflow");
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LLVM_DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_I386_SECREL Value: "
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<< RE.Addend << '\n');
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writeBytesUnaligned(RE.Addend, Target, 4);
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break;
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default:
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llvm_unreachable("unsupported relocation type");
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}
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}
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void registerEHFrames() override {}
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};
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}
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#endif
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