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https://github.com/c64scene-ar/llvm-6502.git
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67868b5791
Fixes <rdar://problem/18297804>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217620 91177308-0d34-0410-b5e6-96231b3b80d8
269 lines
10 KiB
C++
269 lines
10 KiB
C++
//===---- RuntimeDyldMachOI386.h ---- MachO/I386 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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#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDMACHOI386_H
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#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDMACHOI386_H
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#include "../RuntimeDyldMachO.h"
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#define DEBUG_TYPE "dyld"
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namespace llvm {
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class RuntimeDyldMachOI386
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: public RuntimeDyldMachOCRTPBase<RuntimeDyldMachOI386> {
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public:
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typedef uint32_t TargetPtrT;
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RuntimeDyldMachOI386(RTDyldMemoryManager *MM)
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: RuntimeDyldMachOCRTPBase(MM) {}
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unsigned getMaxStubSize() override { return 0; }
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unsigned getStubAlignment() override { return 1; }
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relocation_iterator
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processRelocationRef(unsigned SectionID, relocation_iterator RelI,
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ObjectImage &ObjImg, ObjSectionToIDMap &ObjSectionToID,
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const SymbolTableMap &Symbols, StubMap &Stubs) override {
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const MachOObjectFile &Obj =
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static_cast<const MachOObjectFile &>(*ObjImg.getObjectFile());
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MachO::any_relocation_info RelInfo =
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Obj.getRelocation(RelI->getRawDataRefImpl());
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uint32_t RelType = Obj.getAnyRelocationType(RelInfo);
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if (Obj.isRelocationScattered(RelInfo)) {
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if (RelType == MachO::GENERIC_RELOC_SECTDIFF ||
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RelType == MachO::GENERIC_RELOC_LOCAL_SECTDIFF)
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return processSECTDIFFRelocation(SectionID, RelI, ObjImg,
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ObjSectionToID);
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else if (RelType == MachO::GENERIC_RELOC_VANILLA)
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return processI386ScatteredVANILLA(SectionID, RelI, ObjImg,
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ObjSectionToID);
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llvm_unreachable("Unhandled scattered relocation.");
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}
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RelocationEntry RE(getRelocationEntry(SectionID, ObjImg, RelI));
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RE.Addend = memcpyAddend(RE);
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RelocationValueRef Value(
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getRelocationValueRef(ObjImg, RelI, RE, ObjSectionToID, Symbols));
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// Addends for external, PC-rel relocations on i386 point back to the zero
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// offset. Calculate the final offset from the relocation target instead.
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// This allows us to use the same logic for both external and internal
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// relocations in resolveI386RelocationRef.
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// bool IsExtern = Obj.getPlainRelocationExternal(RelInfo);
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// if (IsExtern && RE.IsPCRel) {
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// uint64_t RelocAddr = 0;
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// RelI->getAddress(RelocAddr);
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// Value.Addend += RelocAddr + 4;
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// }
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if (RE.IsPCRel)
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makeValueAddendPCRel(Value, ObjImg, RelI, 1 << RE.Size);
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RE.Addend = Value.Offset;
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if (Value.SymbolName)
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addRelocationForSymbol(RE, Value.SymbolName);
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else
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addRelocationForSection(RE, Value.SectionID);
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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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DEBUG(dumpRelocationToResolve(RE, Value));
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const SectionEntry &Section = Sections[RE.SectionID];
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uint8_t *LocalAddress = Section.Address + RE.Offset;
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if (RE.IsPCRel) {
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uint64_t FinalAddress = Section.LoadAddress + RE.Offset;
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Value -= FinalAddress + 4; // see MachOX86_64::resolveRelocation.
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}
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switch (RE.RelType) {
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default:
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llvm_unreachable("Invalid relocation type!");
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case MachO::GENERIC_RELOC_VANILLA:
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writeBytesUnaligned(Value + RE.Addend, LocalAddress, 1 << RE.Size);
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break;
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case MachO::GENERIC_RELOC_SECTDIFF:
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case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
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uint64_t SectionABase = Sections[RE.Sections.SectionA].LoadAddress;
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uint64_t SectionBBase = Sections[RE.Sections.SectionB].LoadAddress;
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assert((Value == SectionABase || Value == SectionBBase) &&
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"Unexpected SECTDIFF relocation value.");
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Value = SectionABase - SectionBBase + RE.Addend;
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writeBytesUnaligned(Value, LocalAddress, 1 << RE.Size);
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break;
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}
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case MachO::GENERIC_RELOC_PB_LA_PTR:
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Error("Relocation type not implemented yet!");
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}
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}
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void finalizeSection(ObjectImage &ObjImg, unsigned SectionID,
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const SectionRef &Section) {
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StringRef Name;
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Section.getName(Name);
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if (Name == "__jump_table")
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populateJumpTable(cast<MachOObjectFile>(*ObjImg.getObjectFile()), Section,
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SectionID);
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else if (Name == "__pointers")
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populateIndirectSymbolPointersSection(
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cast<MachOObjectFile>(*ObjImg.getObjectFile()),
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Section, SectionID);
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}
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private:
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relocation_iterator
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processSECTDIFFRelocation(unsigned SectionID, relocation_iterator RelI,
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ObjectImage &Obj,
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ObjSectionToIDMap &ObjSectionToID) {
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const MachOObjectFile *MachO =
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static_cast<const MachOObjectFile *>(Obj.getObjectFile());
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MachO::any_relocation_info RE =
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MachO->getRelocation(RelI->getRawDataRefImpl());
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SectionEntry &Section = Sections[SectionID];
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uint32_t RelocType = MachO->getAnyRelocationType(RE);
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bool IsPCRel = MachO->getAnyRelocationPCRel(RE);
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unsigned Size = MachO->getAnyRelocationLength(RE);
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uint64_t Offset;
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RelI->getOffset(Offset);
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uint8_t *LocalAddress = Section.Address + Offset;
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unsigned NumBytes = 1 << Size;
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int64_t Addend = 0;
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memcpy(&Addend, LocalAddress, NumBytes);
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++RelI;
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MachO::any_relocation_info RE2 =
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MachO->getRelocation(RelI->getRawDataRefImpl());
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uint32_t AddrA = MachO->getScatteredRelocationValue(RE);
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section_iterator SAI = getSectionByAddress(*MachO, AddrA);
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assert(SAI != MachO->section_end() && "Can't find section for address A");
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uint64_t SectionABase;
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SAI->getAddress(SectionABase);
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uint64_t SectionAOffset = AddrA - SectionABase;
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SectionRef SectionA = *SAI;
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bool IsCode;
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SectionA.isText(IsCode);
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uint32_t SectionAID =
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findOrEmitSection(Obj, SectionA, IsCode, ObjSectionToID);
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uint32_t AddrB = MachO->getScatteredRelocationValue(RE2);
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section_iterator SBI = getSectionByAddress(*MachO, AddrB);
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assert(SBI != MachO->section_end() && "Can't find section for address B");
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uint64_t SectionBBase;
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SBI->getAddress(SectionBBase);
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uint64_t SectionBOffset = AddrB - SectionBBase;
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SectionRef SectionB = *SBI;
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uint32_t SectionBID =
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findOrEmitSection(Obj, SectionB, IsCode, ObjSectionToID);
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if (Addend != AddrA - AddrB)
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Error("Unexpected SECTDIFF relocation addend.");
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DEBUG(dbgs() << "Found SECTDIFF: AddrA: " << AddrA << ", AddrB: " << AddrB
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<< ", Addend: " << Addend << ", SectionA ID: " << SectionAID
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<< ", SectionAOffset: " << SectionAOffset
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<< ", SectionB ID: " << SectionBID
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<< ", SectionBOffset: " << SectionBOffset << "\n");
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RelocationEntry R(SectionID, Offset, RelocType, 0, SectionAID,
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SectionAOffset, SectionBID, SectionBOffset, IsPCRel,
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Size);
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addRelocationForSection(R, SectionAID);
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addRelocationForSection(R, SectionBID);
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return ++RelI;
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}
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relocation_iterator processI386ScatteredVANILLA(
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unsigned SectionID, relocation_iterator RelI, ObjectImage &Obj,
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RuntimeDyldMachO::ObjSectionToIDMap &ObjSectionToID) {
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const MachOObjectFile *MachO =
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static_cast<const MachOObjectFile *>(Obj.getObjectFile());
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MachO::any_relocation_info RE =
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MachO->getRelocation(RelI->getRawDataRefImpl());
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SectionEntry &Section = Sections[SectionID];
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uint32_t RelocType = MachO->getAnyRelocationType(RE);
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bool IsPCRel = MachO->getAnyRelocationPCRel(RE);
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unsigned Size = MachO->getAnyRelocationLength(RE);
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uint64_t Offset;
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RelI->getOffset(Offset);
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uint8_t *LocalAddress = Section.Address + Offset;
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unsigned NumBytes = 1 << Size;
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int64_t Addend = 0;
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memcpy(&Addend, LocalAddress, NumBytes);
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unsigned SymbolBaseAddr = MachO->getScatteredRelocationValue(RE);
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section_iterator TargetSI = getSectionByAddress(*MachO, SymbolBaseAddr);
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assert(TargetSI != MachO->section_end() && "Can't find section for symbol");
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uint64_t SectionBaseAddr;
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TargetSI->getAddress(SectionBaseAddr);
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SectionRef TargetSection = *TargetSI;
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bool IsCode;
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TargetSection.isText(IsCode);
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uint32_t TargetSectionID =
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findOrEmitSection(Obj, TargetSection, IsCode, ObjSectionToID);
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Addend -= SectionBaseAddr;
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RelocationEntry R(SectionID, Offset, RelocType, Addend, IsPCRel, Size);
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addRelocationForSection(R, TargetSectionID);
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return ++RelI;
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}
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// Populate stubs in __jump_table section.
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void populateJumpTable(MachOObjectFile &Obj, const SectionRef &JTSection,
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unsigned JTSectionID) {
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assert(!Obj.is64Bit() &&
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"__jump_table section not supported in 64-bit MachO.");
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MachO::dysymtab_command DySymTabCmd = Obj.getDysymtabLoadCommand();
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MachO::section Sec32 = Obj.getSection(JTSection.getRawDataRefImpl());
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uint32_t JTSectionSize = Sec32.size;
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unsigned FirstIndirectSymbol = Sec32.reserved1;
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unsigned JTEntrySize = Sec32.reserved2;
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unsigned NumJTEntries = JTSectionSize / JTEntrySize;
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uint8_t *JTSectionAddr = getSectionAddress(JTSectionID);
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unsigned JTEntryOffset = 0;
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assert((JTSectionSize % JTEntrySize) == 0 &&
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"Jump-table section does not contain a whole number of stubs?");
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for (unsigned i = 0; i < NumJTEntries; ++i) {
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unsigned SymbolIndex =
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Obj.getIndirectSymbolTableEntry(DySymTabCmd, FirstIndirectSymbol + i);
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symbol_iterator SI = Obj.getSymbolByIndex(SymbolIndex);
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StringRef IndirectSymbolName;
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SI->getName(IndirectSymbolName);
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uint8_t *JTEntryAddr = JTSectionAddr + JTEntryOffset;
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createStubFunction(JTEntryAddr);
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RelocationEntry RE(JTSectionID, JTEntryOffset + 1,
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MachO::GENERIC_RELOC_VANILLA, 0, true, 2);
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addRelocationForSymbol(RE, IndirectSymbolName);
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JTEntryOffset += JTEntrySize;
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}
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}
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};
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}
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#undef DEBUG_TYPE
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#endif
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