diff options
Diffstat (limited to 'lib/ExecutionEngine/JITLink/MachO_arm64.cpp')
| -rw-r--r-- | lib/ExecutionEngine/JITLink/MachO_arm64.cpp | 736 |
1 files changed, 736 insertions, 0 deletions
diff --git a/lib/ExecutionEngine/JITLink/MachO_arm64.cpp b/lib/ExecutionEngine/JITLink/MachO_arm64.cpp new file mode 100644 index 000000000000..945343bff89d --- /dev/null +++ b/lib/ExecutionEngine/JITLink/MachO_arm64.cpp @@ -0,0 +1,736 @@ +//===---- MachO_arm64.cpp - JIT linker implementation for MachO/arm64 -----===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// MachO/arm64 jit-link implementation. +// +//===----------------------------------------------------------------------===// + +#include "llvm/ExecutionEngine/JITLink/MachO_arm64.h" + +#include "BasicGOTAndStubsBuilder.h" +#include "MachOLinkGraphBuilder.h" + +#define DEBUG_TYPE "jitlink" + +using namespace llvm; +using namespace llvm::jitlink; +using namespace llvm::jitlink::MachO_arm64_Edges; + +namespace { + +class MachOLinkGraphBuilder_arm64 : public MachOLinkGraphBuilder { +public: + MachOLinkGraphBuilder_arm64(const object::MachOObjectFile &Obj) + : MachOLinkGraphBuilder(Obj), + NumSymbols(Obj.getSymtabLoadCommand().nsyms) { + addCustomSectionParser( + "__eh_frame", [this](NormalizedSection &EHFrameSection) { + if (!EHFrameSection.Data) + return make_error<JITLinkError>( + "__eh_frame section is marked zero-fill"); + return MachOEHFrameBinaryParser( + *this, EHFrameSection.Address, + StringRef(EHFrameSection.Data, EHFrameSection.Size), + *EHFrameSection.GraphSection, 8, 4, NegDelta32, Delta64) + .addToGraph(); + }); + } + +private: + static Expected<MachOARM64RelocationKind> + getRelocationKind(const MachO::relocation_info &RI) { + switch (RI.r_type) { + case MachO::ARM64_RELOC_UNSIGNED: + if (!RI.r_pcrel) { + if (RI.r_length == 3) + return RI.r_extern ? Pointer64 : Pointer64Anon; + else if (RI.r_length == 2) + return Pointer32; + } + break; + case MachO::ARM64_RELOC_SUBTRACTOR: + // SUBTRACTOR must be non-pc-rel, extern, with length 2 or 3. + // Initially represent SUBTRACTOR relocations with 'Delta<W>'. + // They may be turned into NegDelta<W> by parsePairRelocation. + if (!RI.r_pcrel && RI.r_extern) { + if (RI.r_length == 2) + return Delta32; + else if (RI.r_length == 3) + return Delta64; + } + break; + case MachO::ARM64_RELOC_BRANCH26: + if (RI.r_pcrel && RI.r_extern && RI.r_length == 2) + return Branch26; + break; + case MachO::ARM64_RELOC_PAGE21: + if (RI.r_pcrel && RI.r_extern && RI.r_length == 2) + return Page21; + break; + case MachO::ARM64_RELOC_PAGEOFF12: + if (!RI.r_pcrel && RI.r_extern && RI.r_length == 2) + return PageOffset12; + break; + case MachO::ARM64_RELOC_GOT_LOAD_PAGE21: + if (RI.r_pcrel && RI.r_extern && RI.r_length == 2) + return GOTPage21; + break; + case MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12: + if (!RI.r_pcrel && RI.r_extern && RI.r_length == 2) + return GOTPageOffset12; + break; + case MachO::ARM64_RELOC_POINTER_TO_GOT: + if (RI.r_pcrel && RI.r_extern && RI.r_length == 2) + return PointerToGOT; + break; + case MachO::ARM64_RELOC_ADDEND: + if (!RI.r_pcrel && !RI.r_extern && RI.r_length == 2) + return PairedAddend; + break; + } + + return make_error<JITLinkError>( + "Unsupported arm64 relocation: address=" + + formatv("{0:x8}", RI.r_address) + + ", symbolnum=" + formatv("{0:x6}", RI.r_symbolnum) + + ", kind=" + formatv("{0:x1}", RI.r_type) + + ", pc_rel=" + (RI.r_pcrel ? "true" : "false") + + ", extern=" + (RI.r_extern ? "true" : "false") + + ", length=" + formatv("{0:d}", RI.r_length)); + } + + MachO::relocation_info + getRelocationInfo(const object::relocation_iterator RelItr) { + MachO::any_relocation_info ARI = + getObject().getRelocation(RelItr->getRawDataRefImpl()); + MachO::relocation_info RI; + memcpy(&RI, &ARI, sizeof(MachO::relocation_info)); + return RI; + } + + using PairRelocInfo = + std::tuple<MachOARM64RelocationKind, Symbol *, uint64_t>; + + // Parses paired SUBTRACTOR/UNSIGNED relocations and, on success, + // returns the edge kind and addend to be used. + Expected<PairRelocInfo> + parsePairRelocation(Block &BlockToFix, Edge::Kind SubtractorKind, + const MachO::relocation_info &SubRI, + JITTargetAddress FixupAddress, const char *FixupContent, + object::relocation_iterator &UnsignedRelItr, + object::relocation_iterator &RelEnd) { + using namespace support; + + assert(((SubtractorKind == Delta32 && SubRI.r_length == 2) || + (SubtractorKind == Delta64 && SubRI.r_length == 3)) && + "Subtractor kind should match length"); + assert(SubRI.r_extern && "SUBTRACTOR reloc symbol should be extern"); + assert(!SubRI.r_pcrel && "SUBTRACTOR reloc should not be PCRel"); + + if (UnsignedRelItr == RelEnd) + return make_error<JITLinkError>("arm64 SUBTRACTOR without paired " + "UNSIGNED relocation"); + + auto UnsignedRI = getRelocationInfo(UnsignedRelItr); + + if (SubRI.r_address != UnsignedRI.r_address) + return make_error<JITLinkError>("arm64 SUBTRACTOR and paired UNSIGNED " + "point to different addresses"); + + if (SubRI.r_length != UnsignedRI.r_length) + return make_error<JITLinkError>("length of arm64 SUBTRACTOR and paired " + "UNSIGNED reloc must match"); + + Symbol *FromSymbol; + if (auto FromSymbolOrErr = findSymbolByIndex(SubRI.r_symbolnum)) + FromSymbol = FromSymbolOrErr->GraphSymbol; + else + return FromSymbolOrErr.takeError(); + + // Read the current fixup value. + uint64_t FixupValue = 0; + if (SubRI.r_length == 3) + FixupValue = *(const little64_t *)FixupContent; + else + FixupValue = *(const little32_t *)FixupContent; + + // Find 'ToSymbol' using symbol number or address, depending on whether the + // paired UNSIGNED relocation is extern. + Symbol *ToSymbol = nullptr; + if (UnsignedRI.r_extern) { + // Find target symbol by symbol index. + if (auto ToSymbolOrErr = findSymbolByIndex(UnsignedRI.r_symbolnum)) + ToSymbol = ToSymbolOrErr->GraphSymbol; + else + return ToSymbolOrErr.takeError(); + } else { + if (auto ToSymbolOrErr = findSymbolByAddress(FixupValue)) + ToSymbol = &*ToSymbolOrErr; + else + return ToSymbolOrErr.takeError(); + FixupValue -= ToSymbol->getAddress(); + } + + MachOARM64RelocationKind DeltaKind; + Symbol *TargetSymbol; + uint64_t Addend; + if (&BlockToFix == &FromSymbol->getAddressable()) { + TargetSymbol = ToSymbol; + DeltaKind = (SubRI.r_length == 3) ? Delta64 : Delta32; + Addend = FixupValue + (FixupAddress - FromSymbol->getAddress()); + // FIXME: handle extern 'from'. + } else if (&BlockToFix == &ToSymbol->getAddressable()) { + TargetSymbol = &*FromSymbol; + DeltaKind = (SubRI.r_length == 3) ? NegDelta64 : NegDelta32; + Addend = FixupValue - (FixupAddress - ToSymbol->getAddress()); + } else { + // BlockToFix was neither FromSymbol nor ToSymbol. + return make_error<JITLinkError>("SUBTRACTOR relocation must fix up " + "either 'A' or 'B' (or a symbol in one " + "of their alt-entry groups)"); + } + + return PairRelocInfo(DeltaKind, TargetSymbol, Addend); + } + + Error addRelocations() override { + using namespace support; + auto &Obj = getObject(); + + for (auto &S : Obj.sections()) { + + JITTargetAddress SectionAddress = S.getAddress(); + + for (auto RelItr = S.relocation_begin(), RelEnd = S.relocation_end(); + RelItr != RelEnd; ++RelItr) { + + MachO::relocation_info RI = getRelocationInfo(RelItr); + + // Sanity check the relocation kind. + auto Kind = getRelocationKind(RI); + if (!Kind) + return Kind.takeError(); + + // Find the address of the value to fix up. + JITTargetAddress FixupAddress = SectionAddress + (uint32_t)RI.r_address; + + LLVM_DEBUG({ + dbgs() << "Processing " << getMachOARM64RelocationKindName(*Kind) + << " relocation at " << format("0x%016" PRIx64, FixupAddress) + << "\n"; + }); + + // Find the block that the fixup points to. + Block *BlockToFix = nullptr; + { + auto SymbolToFixOrErr = findSymbolByAddress(FixupAddress); + if (!SymbolToFixOrErr) + return SymbolToFixOrErr.takeError(); + BlockToFix = &SymbolToFixOrErr->getBlock(); + } + + if (FixupAddress + static_cast<JITTargetAddress>(1ULL << RI.r_length) > + BlockToFix->getAddress() + BlockToFix->getContent().size()) + return make_error<JITLinkError>( + "Relocation content extends past end of fixup block"); + + // Get a pointer to the fixup content. + const char *FixupContent = BlockToFix->getContent().data() + + (FixupAddress - BlockToFix->getAddress()); + + // The target symbol and addend will be populated by the switch below. + Symbol *TargetSymbol = nullptr; + uint64_t Addend = 0; + + if (*Kind == PairedAddend) { + // If this is an Addend relocation then process it and move to the + // paired reloc. + + Addend = RI.r_symbolnum; + + if (RelItr == RelEnd) + return make_error<JITLinkError>("Unpaired Addend reloc at " + + formatv("{0:x16}", FixupAddress)); + ++RelItr; + RI = getRelocationInfo(RelItr); + + Kind = getRelocationKind(RI); + if (!Kind) + return Kind.takeError(); + + if (*Kind != Branch26 && *Kind != Page21 && *Kind != PageOffset12) + return make_error<JITLinkError>( + "Invalid relocation pair: Addend + " + + getMachOARM64RelocationKindName(*Kind)); + else + LLVM_DEBUG({ + dbgs() << " pair is " << getMachOARM64RelocationKindName(*Kind) + << "`\n"; + }); + + // Find the address of the value to fix up. + JITTargetAddress PairedFixupAddress = + SectionAddress + (uint32_t)RI.r_address; + if (PairedFixupAddress != FixupAddress) + return make_error<JITLinkError>("Paired relocation points at " + "different target"); + } + + switch (*Kind) { + case Branch26: { + if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) + TargetSymbol = TargetSymbolOrErr->GraphSymbol; + else + return TargetSymbolOrErr.takeError(); + uint32_t Instr = *(const ulittle32_t *)FixupContent; + if ((Instr & 0x7fffffff) != 0x14000000) + return make_error<JITLinkError>("BRANCH26 target is not a B or BL " + "instruction with a zero addend"); + break; + } + case Pointer32: + if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) + TargetSymbol = TargetSymbolOrErr->GraphSymbol; + else + return TargetSymbolOrErr.takeError(); + Addend = *(const ulittle32_t *)FixupContent; + break; + case Pointer64: + if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) + TargetSymbol = TargetSymbolOrErr->GraphSymbol; + else + return TargetSymbolOrErr.takeError(); + Addend = *(const ulittle64_t *)FixupContent; + break; + case Pointer64Anon: { + JITTargetAddress TargetAddress = *(const ulittle64_t *)FixupContent; + if (auto TargetSymbolOrErr = findSymbolByAddress(TargetAddress)) + TargetSymbol = &*TargetSymbolOrErr; + else + return TargetSymbolOrErr.takeError(); + Addend = TargetAddress - TargetSymbol->getAddress(); + break; + } + case Page21: + case GOTPage21: { + if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) + TargetSymbol = TargetSymbolOrErr->GraphSymbol; + else + return TargetSymbolOrErr.takeError(); + uint32_t Instr = *(const ulittle32_t *)FixupContent; + if ((Instr & 0xffffffe0) != 0x90000000) + return make_error<JITLinkError>("PAGE21/GOTPAGE21 target is not an " + "ADRP instruction with a zero " + "addend"); + break; + } + case PageOffset12: { + if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) + TargetSymbol = TargetSymbolOrErr->GraphSymbol; + else + return TargetSymbolOrErr.takeError(); + break; + } + case GOTPageOffset12: { + if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) + TargetSymbol = TargetSymbolOrErr->GraphSymbol; + else + return TargetSymbolOrErr.takeError(); + uint32_t Instr = *(const ulittle32_t *)FixupContent; + if ((Instr & 0xfffffc00) != 0xf9400000) + return make_error<JITLinkError>("GOTPAGEOFF12 target is not an LDR " + "immediate instruction with a zero " + "addend"); + break; + } + case PointerToGOT: + if (auto TargetSymbolOrErr = findSymbolByIndex(RI.r_symbolnum)) + TargetSymbol = TargetSymbolOrErr->GraphSymbol; + else + return TargetSymbolOrErr.takeError(); + break; + case Delta32: + case Delta64: { + // We use Delta32/Delta64 to represent SUBTRACTOR relocations. + // parsePairRelocation handles the paired reloc, and returns the + // edge kind to be used (either Delta32/Delta64, or + // NegDelta32/NegDelta64, depending on the direction of the + // subtraction) along with the addend. + auto PairInfo = + parsePairRelocation(*BlockToFix, *Kind, RI, FixupAddress, + FixupContent, ++RelItr, RelEnd); + if (!PairInfo) + return PairInfo.takeError(); + std::tie(*Kind, TargetSymbol, Addend) = *PairInfo; + assert(TargetSymbol && "No target symbol from parsePairRelocation?"); + break; + } + default: + llvm_unreachable("Special relocation kind should not appear in " + "mach-o file"); + } + + LLVM_DEBUG({ + Edge GE(*Kind, FixupAddress - BlockToFix->getAddress(), *TargetSymbol, + Addend); + printEdge(dbgs(), *BlockToFix, GE, + getMachOARM64RelocationKindName(*Kind)); + dbgs() << "\n"; + }); + BlockToFix->addEdge(*Kind, FixupAddress - BlockToFix->getAddress(), + *TargetSymbol, Addend); + } + } + return Error::success(); + } + + unsigned NumSymbols = 0; +}; + +class MachO_arm64_GOTAndStubsBuilder + : public BasicGOTAndStubsBuilder<MachO_arm64_GOTAndStubsBuilder> { +public: + MachO_arm64_GOTAndStubsBuilder(LinkGraph &G) + : BasicGOTAndStubsBuilder<MachO_arm64_GOTAndStubsBuilder>(G) {} + + bool isGOTEdge(Edge &E) const { + return E.getKind() == GOTPage21 || E.getKind() == GOTPageOffset12 || + E.getKind() == PointerToGOT; + } + + Symbol &createGOTEntry(Symbol &Target) { + auto &GOTEntryBlock = G.createContentBlock( + getGOTSection(), getGOTEntryBlockContent(), 0, 8, 0); + GOTEntryBlock.addEdge(Pointer64, 0, Target, 0); + return G.addAnonymousSymbol(GOTEntryBlock, 0, 8, false, false); + } + + void fixGOTEdge(Edge &E, Symbol &GOTEntry) { + if (E.getKind() == GOTPage21 || E.getKind() == GOTPageOffset12) { + // Update the target, but leave the edge addend as-is. + E.setTarget(GOTEntry); + } else if (E.getKind() == PointerToGOT) { + E.setTarget(GOTEntry); + E.setKind(Delta32); + } else + llvm_unreachable("Not a GOT edge?"); + } + + bool isExternalBranchEdge(Edge &E) { + return E.getKind() == Branch26 && !E.getTarget().isDefined(); + } + + Symbol &createStub(Symbol &Target) { + auto &StubContentBlock = + G.createContentBlock(getStubsSection(), getStubBlockContent(), 0, 1, 0); + // Re-use GOT entries for stub targets. + auto &GOTEntrySymbol = getGOTEntrySymbol(Target); + StubContentBlock.addEdge(LDRLiteral19, 0, GOTEntrySymbol, 0); + return G.addAnonymousSymbol(StubContentBlock, 0, 8, true, false); + } + + void fixExternalBranchEdge(Edge &E, Symbol &Stub) { + assert(E.getKind() == Branch26 && "Not a Branch32 edge?"); + assert(E.getAddend() == 0 && "Branch32 edge has non-zero addend?"); + E.setTarget(Stub); + } + +private: + Section &getGOTSection() { + if (!GOTSection) + GOTSection = &G.createSection("$__GOT", sys::Memory::MF_READ); + return *GOTSection; + } + + Section &getStubsSection() { + if (!StubsSection) { + auto StubsProt = static_cast<sys::Memory::ProtectionFlags>( + sys::Memory::MF_READ | sys::Memory::MF_EXEC); + StubsSection = &G.createSection("$__STUBS", StubsProt); + } + return *StubsSection; + } + + StringRef getGOTEntryBlockContent() { + return StringRef(reinterpret_cast<const char *>(NullGOTEntryContent), + sizeof(NullGOTEntryContent)); + } + + StringRef getStubBlockContent() { + return StringRef(reinterpret_cast<const char *>(StubContent), + sizeof(StubContent)); + } + + static const uint8_t NullGOTEntryContent[8]; + static const uint8_t StubContent[8]; + Section *GOTSection = nullptr; + Section *StubsSection = nullptr; +}; + +const uint8_t MachO_arm64_GOTAndStubsBuilder::NullGOTEntryContent[8] = { + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; +const uint8_t MachO_arm64_GOTAndStubsBuilder::StubContent[8] = { + 0x10, 0x00, 0x00, 0x58, // LDR x16, <literal> + 0x00, 0x02, 0x1f, 0xd6 // BR x16 +}; + +} // namespace + +namespace llvm { +namespace jitlink { + +class MachOJITLinker_arm64 : public JITLinker<MachOJITLinker_arm64> { + friend class JITLinker<MachOJITLinker_arm64>; + +public: + MachOJITLinker_arm64(std::unique_ptr<JITLinkContext> Ctx, + PassConfiguration PassConfig) + : JITLinker(std::move(Ctx), std::move(PassConfig)) {} + +private: + StringRef getEdgeKindName(Edge::Kind R) const override { + return getMachOARM64RelocationKindName(R); + } + + Expected<std::unique_ptr<LinkGraph>> + buildGraph(MemoryBufferRef ObjBuffer) override { + auto MachOObj = object::ObjectFile::createMachOObjectFile(ObjBuffer); + if (!MachOObj) + return MachOObj.takeError(); + return MachOLinkGraphBuilder_arm64(**MachOObj).buildGraph(); + } + + static Error targetOutOfRangeError(const Block &B, const Edge &E) { + std::string ErrMsg; + { + raw_string_ostream ErrStream(ErrMsg); + ErrStream << "Relocation target out of range: "; + printEdge(ErrStream, B, E, getMachOARM64RelocationKindName(E.getKind())); + ErrStream << "\n"; + } + return make_error<JITLinkError>(std::move(ErrMsg)); + } + + static unsigned getPageOffset12Shift(uint32_t Instr) { + constexpr uint32_t LDRLiteralMask = 0x3ffffc00; + + // Check for a GPR LDR immediate with a zero embedded literal. + // If found, the top two bits contain the shift. + if ((Instr & LDRLiteralMask) == 0x39400000) + return Instr >> 30; + + // Check for a Neon LDR immediate of size 64-bit or less with a zero + // embedded literal. If found, the top two bits contain the shift. + if ((Instr & LDRLiteralMask) == 0x3d400000) + return Instr >> 30; + + // Check for a Neon LDR immediate of size 128-bit with a zero embedded + // literal. + constexpr uint32_t SizeBitsMask = 0xc0000000; + if ((Instr & (LDRLiteralMask | SizeBitsMask)) == 0x3dc00000) + return 4; + + return 0; + } + + Error applyFixup(Block &B, const Edge &E, char *BlockWorkingMem) const { + using namespace support; + + char *FixupPtr = BlockWorkingMem + E.getOffset(); + JITTargetAddress FixupAddress = B.getAddress() + E.getOffset(); + + switch (E.getKind()) { + case Branch26: { + assert((FixupAddress & 0x3) == 0 && "Branch-inst is not 32-bit aligned"); + + int64_t Value = E.getTarget().getAddress() - FixupAddress + E.getAddend(); + + if (static_cast<uint64_t>(Value) & 0x3) + return make_error<JITLinkError>("Branch26 target is not 32-bit " + "aligned"); + + if (Value < -(1 << 27) || Value > ((1 << 27) - 1)) + return targetOutOfRangeError(B, E); + + uint32_t RawInstr = *(little32_t *)FixupPtr; + assert((RawInstr & 0x7fffffff) == 0x14000000 && + "RawInstr isn't a B or BR immediate instruction"); + uint32_t Imm = (static_cast<uint32_t>(Value) & ((1 << 28) - 1)) >> 2; + uint32_t FixedInstr = RawInstr | Imm; + *(little32_t *)FixupPtr = FixedInstr; + break; + } + case Pointer32: { + uint64_t Value = E.getTarget().getAddress() + E.getAddend(); + if (Value > std::numeric_limits<uint32_t>::max()) + return targetOutOfRangeError(B, E); + *(ulittle32_t *)FixupPtr = Value; + break; + } + case Pointer64: { + uint64_t Value = E.getTarget().getAddress() + E.getAddend(); + *(ulittle64_t *)FixupPtr = Value; + break; + } + case Page21: + case GOTPage21: { + assert(E.getAddend() == 0 && "PAGE21/GOTPAGE21 with non-zero addend"); + uint64_t TargetPage = + E.getTarget().getAddress() & ~static_cast<uint64_t>(4096 - 1); + uint64_t PCPage = B.getAddress() & ~static_cast<uint64_t>(4096 - 1); + + int64_t PageDelta = TargetPage - PCPage; + if (PageDelta < -(1 << 30) || PageDelta > ((1 << 30) - 1)) + return targetOutOfRangeError(B, E); + + uint32_t RawInstr = *(ulittle32_t *)FixupPtr; + assert((RawInstr & 0xffffffe0) == 0x90000000 && + "RawInstr isn't an ADRP instruction"); + uint32_t ImmLo = (static_cast<uint64_t>(PageDelta) >> 12) & 0x3; + uint32_t ImmHi = (static_cast<uint64_t>(PageDelta) >> 14) & 0x7ffff; + uint32_t FixedInstr = RawInstr | (ImmLo << 29) | (ImmHi << 5); + *(ulittle32_t *)FixupPtr = FixedInstr; + break; + } + case PageOffset12: { + assert(E.getAddend() == 0 && "PAGEOFF12 with non-zero addend"); + uint64_t TargetOffset = E.getTarget().getAddress() & 0xfff; + + uint32_t RawInstr = *(ulittle32_t *)FixupPtr; + unsigned ImmShift = getPageOffset12Shift(RawInstr); + + if (TargetOffset & ((1 << ImmShift) - 1)) + return make_error<JITLinkError>("PAGEOFF12 target is not aligned"); + + uint32_t EncodedImm = (TargetOffset >> ImmShift) << 10; + uint32_t FixedInstr = RawInstr | EncodedImm; + *(ulittle32_t *)FixupPtr = FixedInstr; + break; + } + case GOTPageOffset12: { + assert(E.getAddend() == 0 && "GOTPAGEOF12 with non-zero addend"); + + uint32_t RawInstr = *(ulittle32_t *)FixupPtr; + assert((RawInstr & 0xfffffc00) == 0xf9400000 && + "RawInstr isn't a 64-bit LDR immediate"); + + uint32_t TargetOffset = E.getTarget().getAddress() & 0xfff; + assert((TargetOffset & 0x7) == 0 && "GOT entry is not 8-byte aligned"); + uint32_t EncodedImm = (TargetOffset >> 3) << 10; + uint32_t FixedInstr = RawInstr | EncodedImm; + *(ulittle32_t *)FixupPtr = FixedInstr; + break; + } + case LDRLiteral19: { + assert((FixupAddress & 0x3) == 0 && "LDR is not 32-bit aligned"); + assert(E.getAddend() == 0 && "LDRLiteral19 with non-zero addend"); + uint32_t RawInstr = *(ulittle32_t *)FixupPtr; + assert(RawInstr == 0x58000010 && "RawInstr isn't a 64-bit LDR literal"); + int64_t Delta = E.getTarget().getAddress() - FixupAddress; + if (Delta & 0x3) + return make_error<JITLinkError>("LDR literal target is not 32-bit " + "aligned"); + if (Delta < -(1 << 20) || Delta > ((1 << 20) - 1)) + return targetOutOfRangeError(B, E); + + uint32_t EncodedImm = (static_cast<uint32_t>(Delta) >> 2) << 5; + uint32_t FixedInstr = RawInstr | EncodedImm; + *(ulittle32_t *)FixupPtr = FixedInstr; + break; + } + case Delta32: + case Delta64: + case NegDelta32: + case NegDelta64: { + int64_t Value; + if (E.getKind() == Delta32 || E.getKind() == Delta64) + Value = E.getTarget().getAddress() - FixupAddress + E.getAddend(); + else + Value = FixupAddress - E.getTarget().getAddress() + E.getAddend(); + + if (E.getKind() == Delta32 || E.getKind() == NegDelta32) { + if (Value < std::numeric_limits<int32_t>::min() || + Value > std::numeric_limits<int32_t>::max()) + return targetOutOfRangeError(B, E); + *(little32_t *)FixupPtr = Value; + } else + *(little64_t *)FixupPtr = Value; + break; + } + default: + llvm_unreachable("Unrecognized edge kind"); + } + + return Error::success(); + } + + uint64_t NullValue = 0; +}; + +void jitLink_MachO_arm64(std::unique_ptr<JITLinkContext> Ctx) { + PassConfiguration Config; + Triple TT("arm64-apple-ios"); + + if (Ctx->shouldAddDefaultTargetPasses(TT)) { + // Add a mark-live pass. + if (auto MarkLive = Ctx->getMarkLivePass(TT)) + Config.PrePrunePasses.push_back(std::move(MarkLive)); + else + Config.PrePrunePasses.push_back(markAllSymbolsLive); + + // Add an in-place GOT/Stubs pass. + Config.PostPrunePasses.push_back([](LinkGraph &G) -> Error { + MachO_arm64_GOTAndStubsBuilder(G).run(); + return Error::success(); + }); + } + + if (auto Err = Ctx->modifyPassConfig(TT, Config)) + return Ctx->notifyFailed(std::move(Err)); + + // Construct a JITLinker and run the link function. + MachOJITLinker_arm64::link(std::move(Ctx), std::move(Config)); +} + +StringRef getMachOARM64RelocationKindName(Edge::Kind R) { + switch (R) { + case Branch26: + return "Branch26"; + case Pointer64: + return "Pointer64"; + case Pointer64Anon: + return "Pointer64Anon"; + case Page21: + return "Page21"; + case PageOffset12: + return "PageOffset12"; + case GOTPage21: + return "GOTPage21"; + case GOTPageOffset12: + return "GOTPageOffset12"; + case PointerToGOT: + return "PointerToGOT"; + case PairedAddend: + return "PairedAddend"; + case LDRLiteral19: + return "LDRLiteral19"; + case Delta32: + return "Delta32"; + case Delta64: + return "Delta64"; + case NegDelta32: + return "NegDelta32"; + case NegDelta64: + return "NegDelta64"; + default: + return getGenericEdgeKindName(static_cast<Edge::Kind>(R)); + } +} + +} // end namespace jitlink +} // end namespace llvm |