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llvm-for-llvmta/lib/ExecutionEngine/JITLink/MachO_arm64.cpp

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//===---- 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, Triple("arm64-apple-darwin")),
NumSymbols(Obj.getSymtabLoadCommand().nsyms) {}
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));
}
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 {
auto ToSymbolSec = findSectionByIndex(UnsignedRI.r_symbolnum - 1);
if (!ToSymbolSec)
return ToSymbolSec.takeError();
ToSymbol = getSymbolByAddress(ToSymbolSec->Address);
assert(ToSymbol && "No symbol for section");
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();
LLVM_DEBUG(dbgs() << "Processing relocations:\n");
for (auto &S : Obj.sections()) {
JITTargetAddress SectionAddress = S.getAddress();
// Skip relocations virtual sections.
if (S.isVirtual()) {
if (S.relocation_begin() != S.relocation_end())
return make_error<JITLinkError>("Virtual section contains "
"relocations");
continue;
}
// Skip relocations for debug symbols.
{
auto &NSec =
getSectionByIndex(Obj.getSectionIndex(S.getRawDataRefImpl()));
if (!NSec.GraphSection) {
LLVM_DEBUG({
dbgs() << " Skipping relocations for MachO section "
<< NSec.SegName << "/" << NSec.SectName
<< " which has no associated graph section\n";
});
continue;
}
}
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({
auto &NSec =
getSectionByIndex(Obj.getSectionIndex(S.getRawDataRefImpl()));
dbgs() << " " << NSec.SectName << " + "
<< formatv("{0:x8}", RI.r_address) << ":\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 = SignExtend64(RI.r_symbolnum, 24);
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));
LLVM_DEBUG({
dbgs() << " Addend: value = " << formatv("{0:x6}", Addend)
<< ", 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();
uint32_t Instr = *(const ulittle32_t *)FixupContent;
uint32_t EncodedAddend = (Instr & 0x003FFC00) >> 10;
if (EncodedAddend != 0)
return make_error<JITLinkError>("GOTPAGEOFF12 target has non-zero "
"encoded addend");
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({
dbgs() << " ";
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,
std::unique_ptr<LinkGraph> G,
PassConfiguration PassConfig)
: JITLinker(std::move(Ctx), std::move(G), std::move(PassConfig)) {}
private:
StringRef getEdgeKindName(Edge::Kind R) const override {
return getMachOARM64RelocationKindName(R);
}
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 LoadStoreImm12Mask = 0x3b000000;
constexpr uint32_t Vec128Mask = 0x04800000;
if ((Instr & LoadStoreImm12Mask) == 0x39000000) {
uint32_t ImplicitShift = Instr >> 30;
if (ImplicitShift == 0)
if ((Instr & Vec128Mask) == Vec128Mask)
ImplicitShift = 4;
return ImplicitShift;
}
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:
case Pointer64Anon: {
uint64_t Value = E.getTarget().getAddress() + E.getAddend();
*(ulittle64_t *)FixupPtr = Value;
break;
}
case Page21:
case GOTPage21: {
assert((E.getKind() != GOTPage21 || E.getAddend() == 0) &&
"GOTPAGE21 with non-zero addend");
uint64_t TargetPage =
(E.getTarget().getAddress() + E.getAddend()) &
~static_cast<uint64_t>(4096 - 1);
uint64_t PCPage = FixupAddress & ~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: {
uint64_t TargetOffset =
(E.getTarget().getAddress() + E.getAddend()) & 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;
};
Expected<std::unique_ptr<LinkGraph>>
createLinkGraphFromMachOObject_arm64(MemoryBufferRef ObjectBuffer) {
auto MachOObj = object::ObjectFile::createMachOObjectFile(ObjectBuffer);
if (!MachOObj)
return MachOObj.takeError();
return MachOLinkGraphBuilder_arm64(**MachOObj).buildGraph();
}
void link_MachO_arm64(std::unique_ptr<LinkGraph> G,
std::unique_ptr<JITLinkContext> Ctx) {
PassConfiguration Config;
if (Ctx->shouldAddDefaultTargetPasses(G->getTargetTriple())) {
// Add a mark-live pass.
if (auto MarkLive = Ctx->getMarkLivePass(G->getTargetTriple()))
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(G->getTargetTriple(), Config))
return Ctx->notifyFailed(std::move(Err));
// Construct a JITLinker and run the link function.
MachOJITLinker_arm64::link(std::move(Ctx), std::move(G), 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
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