Revert r153694. It was causing failures in the buildbots.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153701 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
index 1318b44..7130e0e 100644
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
@@ -21,55 +21,41 @@
namespace llvm {
-void RuntimeDyldMachO::resolveRelocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value,
- uint32_t Type,
- int64_t Addend) {
- bool isPCRel = (Type >> 24) & 1;
- unsigned MachoType = (Type >> 28) & 0xf;
- unsigned Size = 1 << ((Type >> 25) & 3);
-
- DEBUG(dbgs() << "resolveRelocation LocalAddress: " << format("%p", LocalAddress)
- << " FinalAddress: " << format("%p", FinalAddress)
- << " Value: " << format("%p", Value)
- << " Addend: " << Addend
- << " isPCRel: " << isPCRel
- << " MachoType: " << MachoType
- << " Size: " << Size
- << "\n");
-
+bool RuntimeDyldMachO::
+resolveRelocation(uint8_t *LocalAddress,
+ uint64_t FinalAddress,
+ uint64_t Value,
+ bool isPCRel,
+ unsigned Type,
+ unsigned Size,
+ int64_t Addend) {
// This just dispatches to the proper target specific routine.
- switch (Arch) {
+ switch (CPUType) {
default: llvm_unreachable("Unsupported CPU type!");
- case Triple::x86_64:
- resolveX86_64Relocation(LocalAddress,
- FinalAddress,
- (uintptr_t)Value,
- isPCRel,
- MachoType,
- Size,
- Addend);
- break;
- case Triple::x86:
- resolveI386Relocation(LocalAddress,
+ case mach::CTM_i386:
+ return resolveI386Relocation(LocalAddress,
FinalAddress,
(uintptr_t)Value,
isPCRel,
Type,
Size,
Addend);
- break;
- case Triple::arm: // Fall through.
- case Triple::thumb:
- resolveARMRelocation(LocalAddress,
- FinalAddress,
- (uintptr_t)Value,
- isPCRel,
- MachoType,
- Size,
- Addend);
- break;
+ case mach::CTM_x86_64:
+ return resolveX86_64Relocation(LocalAddress,
+ FinalAddress,
+ (uintptr_t)Value,
+ isPCRel,
+ Type,
+ Size,
+ Addend);
+ case mach::CTM_ARM:
+ return resolveARMRelocation(LocalAddress,
+ FinalAddress,
+ (uintptr_t)Value,
+ isPCRel,
+ Type,
+ Size,
+ Addend);
}
}
@@ -204,84 +190,503 @@
return false;
}
-void RuntimeDyldMachO::processRelocationRef(const ObjRelocationInfo &Rel,
- const ObjectFile &Obj,
- ObjSectionToIDMap &ObjSectionToID,
- LocalSymbolMap &Symbols,
- StubMap &Stubs) {
+bool RuntimeDyldMachO::
+loadSegment32(const MachOObject *Obj,
+ const MachOObject::LoadCommandInfo *SegmentLCI,
+ const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
+ // FIXME: This should really be combined w/ loadSegment64. Templatized
+ // function on the 32/64 datatypes maybe?
+ InMemoryStruct<macho::SegmentLoadCommand> SegmentLC;
+ Obj->ReadSegmentLoadCommand(*SegmentLCI, SegmentLC);
+ if (!SegmentLC)
+ return Error("unable to load segment load command");
- uint32_t RelType = (uint32_t) (Rel.Type & 0xffffffffL);
- RelocationValueRef Value;
- SectionEntry &Section = Sections[Rel.SectionID];
- uint8_t *Target = Section.Address + Rel.Offset;
- bool isExtern = (RelType >> 27) & 1;
- if (isExtern) {
- StringRef TargetName;
- const SymbolRef &Symbol = Rel.Symbol;
- Symbol.getName(TargetName);
- // First look the symbol in object file symbols.
- LocalSymbolMap::iterator lsi = Symbols.find(TargetName.data());
- if (lsi != Symbols.end()) {
- Value.SectionID = lsi->second.first;
- Value.Addend = lsi->second.second;
- } else {
- // Second look the symbol in global symbol table.
- StringMap<SymbolLoc>::iterator gsi = SymbolTable.find(TargetName.data());
- if (gsi != SymbolTable.end()) {
- Value.SectionID = gsi->second.first;
- Value.Addend = gsi->second.second;
- } else
- Value.SymbolName = TargetName.data();
- }
- } else {
- error_code err;
- uint8_t sectionIndex = static_cast<uint8_t>(RelType & 0xFF);
- section_iterator si = Obj.begin_sections(),
- se = Obj.end_sections();
- for (uint8_t i = 1; i < sectionIndex; i++) {
- error_code err;
- si.increment(err);
- if (si == se)
- break;
- }
- assert(si != se && "No section containing relocation!");
- Value.SectionID = findOrEmitSection(*si, true, ObjSectionToID);
- Value.Addend = *(const intptr_t *)Target;
- if (Value.Addend) {
- // The MachO addend is offset from the current section, we need set it
- // as offset from destination section
- Value.Addend += Section.ObjAddress - Sections[Value.SectionID].ObjAddress;
+ SmallVector<unsigned, 16> SectionMap;
+ for (unsigned SectNum = 0; SectNum != SegmentLC->NumSections; ++SectNum) {
+ InMemoryStruct<macho::Section> Sect;
+ Obj->ReadSection(*SegmentLCI, SectNum, Sect);
+ if (!Sect)
+ return Error("unable to load section: '" + Twine(SectNum) + "'");
+
+ // Allocate memory via the MM for the section.
+ uint8_t *Buffer;
+ uint32_t SectionID = Sections.size();
+ if (Sect->Flags == 0x80000400)
+ Buffer = MemMgr->allocateCodeSection(Sect->Size, Sect->Align, SectionID);
+ else
+ Buffer = MemMgr->allocateDataSection(Sect->Size, Sect->Align, SectionID);
+
+ DEBUG(dbgs() << "Loading "
+ << ((Sect->Flags == 0x80000400) ? "text" : "data")
+ << " (ID #" << SectionID << ")"
+ << " '" << Sect->SegmentName << ","
+ << Sect->Name << "' of size " << Sect->Size
+ << " to address " << Buffer << ".\n");
+
+ // Copy the payload from the object file into the allocated buffer.
+ uint8_t *Base = (uint8_t*)Obj->getData(SegmentLC->FileOffset,
+ SegmentLC->FileSize).data();
+ memcpy(Buffer, Base + Sect->Address, Sect->Size);
+
+ // Remember what got allocated for this SectionID.
+ Sections.push_back(sys::MemoryBlock(Buffer, Sect->Size));
+ SectionLocalMemToID[Buffer] = SectionID;
+
+ // By default, the load address of a section is its memory buffer.
+ SectionLoadAddress.push_back((uint64_t)Buffer);
+
+ // Keep a map of object file section numbers to corresponding SectionIDs
+ // while processing the file.
+ SectionMap.push_back(SectionID);
+ }
+
+ // Process the symbol table.
+ SmallVector<StringRef, 64> SymbolNames;
+ processSymbols32(Obj, SectionMap, SymbolNames, SymtabLC);
+
+ // Process the relocations for each section we're loading.
+ Relocations.grow(Relocations.size() + SegmentLC->NumSections);
+ Referrers.grow(Referrers.size() + SegmentLC->NumSections);
+ for (unsigned SectNum = 0; SectNum != SegmentLC->NumSections; ++SectNum) {
+ InMemoryStruct<macho::Section> Sect;
+ Obj->ReadSection(*SegmentLCI, SectNum, Sect);
+ if (!Sect)
+ return Error("unable to load section: '" + Twine(SectNum) + "'");
+ for (unsigned j = 0; j != Sect->NumRelocationTableEntries; ++j) {
+ InMemoryStruct<macho::RelocationEntry> RE;
+ Obj->ReadRelocationEntry(Sect->RelocationTableOffset, j, RE);
+ if (RE->Word0 & macho::RF_Scattered)
+ return Error("NOT YET IMPLEMENTED: scattered relocations.");
+ // Word0 of the relocation is the offset into the section where the
+ // relocation should be applied. We need to translate that into an
+ // offset into a function since that's our atom.
+ uint32_t Offset = RE->Word0;
+ bool isExtern = (RE->Word1 >> 27) & 1;
+
+ // FIXME: Get the relocation addend from the target address.
+ // FIXME: VERY imporant for internal relocations.
+
+ // Figure out the source symbol of the relocation. If isExtern is true,
+ // this relocation references the symbol table, otherwise it references
+ // a section in the same object, numbered from 1 through NumSections
+ // (SectionBases is [0, NumSections-1]).
+ uint32_t SourceNum = RE->Word1 & 0xffffff; // 24-bit value
+ if (!isExtern) {
+ assert(SourceNum > 0 && "Invalid relocation section number!");
+ unsigned SectionID = SectionMap[SourceNum - 1];
+ unsigned TargetID = SectionMap[SectNum];
+ DEBUG(dbgs() << "Internal relocation at Section #"
+ << TargetID << " + " << Offset
+ << " from Section #"
+ << SectionID << " (Word1: "
+ << format("0x%x", RE->Word1) << ")\n");
+
+ // Store the relocation information. It will get resolved when
+ // the section addresses are assigned.
+ uint32_t RelocationIndex = Relocations[SectionID].size();
+ Relocations[SectionID].push_back(RelocationEntry(TargetID,
+ Offset,
+ RE->Word1,
+ 0 /*Addend*/));
+ Referrers[TargetID].push_back(Referrer(SectionID, RelocationIndex));
+ } else {
+ StringRef SourceName = SymbolNames[SourceNum];
+
+ // Now store the relocation information. Associate it with the source
+ // symbol. Just add it to the unresolved list and let the general
+ // path post-load resolve it if we know where the symbol is.
+ UnresolvedRelocations[SourceName].push_back(RelocationEntry(SectNum,
+ Offset,
+ RE->Word1,
+ 0 /*Addend*/));
+ DEBUG(dbgs() << "Relocation at Section #" << SectNum << " + " << Offset
+ << " from '" << SourceName << "(Word1: "
+ << format("0x%x", RE->Word1) << ")\n");
+ }
}
}
- if (Arch == Triple::arm && RelType == macho::RIT_ARM_Branch24Bit) {
- // This is an ARM branch relocation, need to use a stub function.
+ // Resolve the addresses of any symbols that were defined in this segment.
+ for (int i = 0, e = SymbolNames.size(); i != e; ++i)
+ resolveSymbol(SymbolNames[i]);
- // Look up for existing stub.
- StubMap::const_iterator i = Stubs.find(Value);
- if (i != Stubs.end())
- resolveRelocation(Target, (uint64_t)Target,
- (uint64_t)Section.Address + i->second,
- RelType, 0);
- else {
- // Create a new stub function.
- Stubs[Value] = Section.StubOffset;
- uint8_t *StubTargetAddr = createStubFunction(Section.Address +
- Section.StubOffset);
- AddRelocation(Value, Rel.SectionID, StubTargetAddr - Section.Address,
- macho::RIT_Vanilla);
- resolveRelocation(Target, (uint64_t)Target,
- (uint64_t)Section.Address + Section.StubOffset,
- RelType, 0);
- Section.StubOffset += getMaxStubSize();
- }
- } else
- AddRelocation(Value, Rel.SectionID, Rel.Offset, RelType);
+ return false;
}
-bool RuntimeDyldMachO::isCompatibleFormat(const MemoryBuffer *InputBuffer) const {
+bool RuntimeDyldMachO::
+loadSegment64(const MachOObject *Obj,
+ const MachOObject::LoadCommandInfo *SegmentLCI,
+ const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
+ InMemoryStruct<macho::Segment64LoadCommand> Segment64LC;
+ Obj->ReadSegment64LoadCommand(*SegmentLCI, Segment64LC);
+ if (!Segment64LC)
+ return Error("unable to load segment load command");
+
+
+ SmallVector<unsigned, 16> SectionMap;
+ for (unsigned SectNum = 0; SectNum != Segment64LC->NumSections; ++SectNum) {
+ InMemoryStruct<macho::Section64> Sect;
+ Obj->ReadSection64(*SegmentLCI, SectNum, Sect);
+ if (!Sect)
+ return Error("unable to load section: '" + Twine(SectNum) + "'");
+
+ // Allocate memory via the MM for the section.
+ uint8_t *Buffer;
+ uint32_t SectionID = Sections.size();
+ unsigned Align = 1 << Sect->Align; // .o file has log2 alignment.
+ if (Sect->Flags == 0x80000400)
+ Buffer = MemMgr->allocateCodeSection(Sect->Size, Align, SectionID);
+ else
+ Buffer = MemMgr->allocateDataSection(Sect->Size, Align, SectionID);
+
+ DEBUG(dbgs() << "Loading "
+ << ((Sect->Flags == 0x80000400) ? "text" : "data")
+ << " (ID #" << SectionID << ")"
+ << " '" << Sect->SegmentName << ","
+ << Sect->Name << "' of size " << Sect->Size
+ << " (align " << Align << ")"
+ << " to address " << Buffer << ".\n");
+
+ // Copy the payload from the object file into the allocated buffer.
+ uint8_t *Base = (uint8_t*)Obj->getData(Segment64LC->FileOffset,
+ Segment64LC->FileSize).data();
+ memcpy(Buffer, Base + Sect->Address, Sect->Size);
+
+ // Remember what got allocated for this SectionID.
+ Sections.push_back(sys::MemoryBlock(Buffer, Sect->Size));
+ SectionLocalMemToID[Buffer] = SectionID;
+
+ // By default, the load address of a section is its memory buffer.
+ SectionLoadAddress.push_back((uint64_t)Buffer);
+
+ // Keep a map of object file section numbers to corresponding SectionIDs
+ // while processing the file.
+ SectionMap.push_back(SectionID);
+ }
+
+ // Process the symbol table.
+ SmallVector<StringRef, 64> SymbolNames;
+ processSymbols64(Obj, SectionMap, SymbolNames, SymtabLC);
+
+ // Process the relocations for each section we're loading.
+ Relocations.grow(Relocations.size() + Segment64LC->NumSections);
+ Referrers.grow(Referrers.size() + Segment64LC->NumSections);
+ for (unsigned SectNum = 0; SectNum != Segment64LC->NumSections; ++SectNum) {
+ InMemoryStruct<macho::Section64> Sect;
+ Obj->ReadSection64(*SegmentLCI, SectNum, Sect);
+ if (!Sect)
+ return Error("unable to load section: '" + Twine(SectNum) + "'");
+ for (unsigned j = 0; j != Sect->NumRelocationTableEntries; ++j) {
+ InMemoryStruct<macho::RelocationEntry> RE;
+ Obj->ReadRelocationEntry(Sect->RelocationTableOffset, j, RE);
+ if (RE->Word0 & macho::RF_Scattered)
+ return Error("NOT YET IMPLEMENTED: scattered relocations.");
+ // Word0 of the relocation is the offset into the section where the
+ // relocation should be applied. We need to translate that into an
+ // offset into a function since that's our atom.
+ uint32_t Offset = RE->Word0;
+ bool isExtern = (RE->Word1 >> 27) & 1;
+
+ // FIXME: Get the relocation addend from the target address.
+ // FIXME: VERY imporant for internal relocations.
+
+ // Figure out the source symbol of the relocation. If isExtern is true,
+ // this relocation references the symbol table, otherwise it references
+ // a section in the same object, numbered from 1 through NumSections
+ // (SectionBases is [0, NumSections-1]).
+ uint32_t SourceNum = RE->Word1 & 0xffffff; // 24-bit value
+ if (!isExtern) {
+ assert(SourceNum > 0 && "Invalid relocation section number!");
+ unsigned SectionID = SectionMap[SourceNum - 1];
+ unsigned TargetID = SectionMap[SectNum];
+ DEBUG(dbgs() << "Internal relocation at Section #"
+ << TargetID << " + " << Offset
+ << " from Section #"
+ << SectionID << " (Word1: "
+ << format("0x%x", RE->Word1) << ")\n");
+
+ // Store the relocation information. It will get resolved when
+ // the section addresses are assigned.
+ uint32_t RelocationIndex = Relocations[SectionID].size();
+ Relocations[SectionID].push_back(RelocationEntry(TargetID,
+ Offset,
+ RE->Word1,
+ 0 /*Addend*/));
+ Referrers[TargetID].push_back(Referrer(SectionID, RelocationIndex));
+ } else {
+ StringRef SourceName = SymbolNames[SourceNum];
+
+ // Now store the relocation information. Associate it with the source
+ // symbol. Just add it to the unresolved list and let the general
+ // path post-load resolve it if we know where the symbol is.
+ UnresolvedRelocations[SourceName].push_back(RelocationEntry(SectNum,
+ Offset,
+ RE->Word1,
+ 0 /*Addend*/));
+ DEBUG(dbgs() << "Relocation at Section #" << SectNum << " + " << Offset
+ << " from '" << SourceName << "(Word1: "
+ << format("0x%x", RE->Word1) << ")\n");
+ }
+ }
+ }
+
+ // Resolve the addresses of any symbols that were defined in this segment.
+ for (int i = 0, e = SymbolNames.size(); i != e; ++i)
+ resolveSymbol(SymbolNames[i]);
+
+ return false;
+}
+
+bool RuntimeDyldMachO::
+processSymbols32(const MachOObject *Obj,
+ SmallVectorImpl<unsigned> &SectionMap,
+ SmallVectorImpl<StringRef> &SymbolNames,
+ const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
+ // FIXME: Combine w/ processSymbols64. Factor 64/32 datatype and such.
+ for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
+ InMemoryStruct<macho::SymbolTableEntry> STE;
+ Obj->ReadSymbolTableEntry(SymtabLC->SymbolTableOffset, i, STE);
+ if (!STE)
+ return Error("unable to read symbol: '" + Twine(i) + "'");
+ // Get the symbol name.
+ StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
+ SymbolNames.push_back(Name);
+
+ // FIXME: Check the symbol type and flags.
+ if (STE->Type != 0xF) // external, defined in this segment.
+ continue;
+ // Flags in the upper nibble we don't care about.
+ if ((STE->Flags & 0xf) != 0x0)
+ continue;
+
+ // Remember the symbol.
+ uint32_t SectionID = SectionMap[STE->SectionIndex - 1];
+ SymbolTable[Name] = SymbolLoc(SectionID, STE->Value);
+
+ DEBUG(dbgs() << "Symbol: '" << Name << "' @ "
+ << (getSectionAddress(SectionID) + STE->Value)
+ << "\n");
+ }
+ return false;
+}
+
+bool RuntimeDyldMachO::
+processSymbols64(const MachOObject *Obj,
+ SmallVectorImpl<unsigned> &SectionMap,
+ SmallVectorImpl<StringRef> &SymbolNames,
+ const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
+ for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
+ InMemoryStruct<macho::Symbol64TableEntry> STE;
+ Obj->ReadSymbol64TableEntry(SymtabLC->SymbolTableOffset, i, STE);
+ if (!STE)
+ return Error("unable to read symbol: '" + Twine(i) + "'");
+ // Get the symbol name.
+ StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
+ SymbolNames.push_back(Name);
+
+ // FIXME: Check the symbol type and flags.
+ if (STE->Type != 0xF) // external, defined in this segment.
+ continue;
+ // Flags in the upper nibble we don't care about.
+ if ((STE->Flags & 0xf) != 0x0)
+ continue;
+
+ // Remember the symbol.
+ uint32_t SectionID = SectionMap[STE->SectionIndex - 1];
+ SymbolTable[Name] = SymbolLoc(SectionID, STE->Value);
+
+ DEBUG(dbgs() << "Symbol: '" << Name << "' @ "
+ << (getSectionAddress(SectionID) + STE->Value)
+ << "\n");
+ }
+ return false;
+}
+
+// resolveSymbol - Resolve any relocations to the specified symbol if
+// we know where it lives.
+void RuntimeDyldMachO::resolveSymbol(StringRef Name) {
+ StringMap<SymbolLoc>::const_iterator Loc = SymbolTable.find(Name);
+ if (Loc == SymbolTable.end())
+ return;
+
+ RelocationList &Relocs = UnresolvedRelocations[Name];
+ DEBUG(dbgs() << "Resolving symbol '" << Name << "'\n");
+ for (int i = 0, e = Relocs.size(); i != e; ++i) {
+ // Change the relocation to be section relative rather than symbol
+ // relative and move it to the resolved relocation list.
+ RelocationEntry Entry = Relocs[i];
+ Entry.Addend += Loc->second.second;
+ uint32_t RelocationIndex = Relocations[Loc->second.first].size();
+ Relocations[Loc->second.first].push_back(Entry);
+ Referrers[Entry.SectionID].push_back(Referrer(Loc->second.first, RelocationIndex));
+ }
+ // FIXME: Keep a worklist of the relocations we've added so that we can
+ // resolve more selectively later.
+ Relocs.clear();
+}
+
+bool RuntimeDyldMachO::loadObject(MemoryBuffer *InputBuffer) {
+ // If the linker is in an error state, don't do anything.
+ if (hasError())
+ return true;
+ // Load the Mach-O wrapper object.
+ std::string ErrorStr;
+ OwningPtr<MachOObject> Obj(
+ MachOObject::LoadFromBuffer(InputBuffer, &ErrorStr));
+ if (!Obj)
+ return Error("unable to load object: '" + ErrorStr + "'");
+
+ // Get the CPU type information from the header.
+ const macho::Header &Header = Obj->getHeader();
+
+ // FIXME: Error checking that the loaded object is compatible with
+ // the system we're running on.
+ CPUType = Header.CPUType;
+ CPUSubtype = Header.CPUSubtype;
+
+ // Validate that the load commands match what we expect.
+ const MachOObject::LoadCommandInfo *SegmentLCI = 0, *SymtabLCI = 0,
+ *DysymtabLCI = 0;
+ for (unsigned i = 0; i != Header.NumLoadCommands; ++i) {
+ const MachOObject::LoadCommandInfo &LCI = Obj->getLoadCommandInfo(i);
+ switch (LCI.Command.Type) {
+ case macho::LCT_Segment:
+ case macho::LCT_Segment64:
+ if (SegmentLCI)
+ return Error("unexpected input object (multiple segments)");
+ SegmentLCI = &LCI;
+ break;
+ case macho::LCT_Symtab:
+ if (SymtabLCI)
+ return Error("unexpected input object (multiple symbol tables)");
+ SymtabLCI = &LCI;
+ break;
+ case macho::LCT_Dysymtab:
+ if (DysymtabLCI)
+ return Error("unexpected input object (multiple symbol tables)");
+ DysymtabLCI = &LCI;
+ break;
+ default:
+ return Error("unexpected input object (unexpected load command");
+ }
+ }
+
+ if (!SymtabLCI)
+ return Error("no symbol table found in object");
+ if (!SegmentLCI)
+ return Error("no segments found in object");
+
+ // Read and register the symbol table data.
+ InMemoryStruct<macho::SymtabLoadCommand> SymtabLC;
+ Obj->ReadSymtabLoadCommand(*SymtabLCI, SymtabLC);
+ if (!SymtabLC)
+ return Error("unable to load symbol table load command");
+ Obj->RegisterStringTable(*SymtabLC);
+
+ // Read the dynamic link-edit information, if present (not present in static
+ // objects).
+ if (DysymtabLCI) {
+ InMemoryStruct<macho::DysymtabLoadCommand> DysymtabLC;
+ Obj->ReadDysymtabLoadCommand(*DysymtabLCI, DysymtabLC);
+ if (!DysymtabLC)
+ return Error("unable to load dynamic link-exit load command");
+
+ // FIXME: We don't support anything interesting yet.
+// if (DysymtabLC->LocalSymbolsIndex != 0)
+// return Error("NOT YET IMPLEMENTED: local symbol entries");
+// if (DysymtabLC->ExternalSymbolsIndex != 0)
+// return Error("NOT YET IMPLEMENTED: non-external symbol entries");
+// if (DysymtabLC->UndefinedSymbolsIndex != SymtabLC->NumSymbolTableEntries)
+// return Error("NOT YET IMPLEMENTED: undefined symbol entries");
+ }
+
+ // Load the segment load command.
+ if (SegmentLCI->Command.Type == macho::LCT_Segment) {
+ if (loadSegment32(Obj.get(), SegmentLCI, SymtabLC))
+ return true;
+ } else {
+ if (loadSegment64(Obj.get(), SegmentLCI, SymtabLC))
+ return true;
+ }
+
+ // Assign the addresses of the sections from the object so that any
+ // relocations to them get set properly.
+ // FIXME: This is done directly from the client at the moment. We should
+ // default the values to the local storage, at least when the target arch
+ // is the same as the host arch.
+
+ return false;
+}
+
+// Assign an address to a symbol name and resolve all the relocations
+// associated with it.
+void RuntimeDyldMachO::reassignSectionAddress(unsigned SectionID,
+ uint64_t Addr) {
+ // The address to use for relocation resolution is not
+ // the address of the local section buffer. We must be doing
+ // a remote execution environment of some sort. Re-apply any
+ // relocations referencing this section with the given address.
+ //
+ // Addr is a uint64_t because we can't assume the pointer width
+ // of the target is the same as that of the host. Just use a generic
+ // "big enough" type.
+
+ SectionLoadAddress[SectionID] = Addr;
+
+ RelocationList &Relocs = Relocations[SectionID];
+ for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
+ RelocationEntry &RE = Relocs[i];
+ uint8_t *Target = (uint8_t*)Sections[RE.SectionID].base() + RE.Offset;
+ uint64_t FinalTarget = (uint64_t)SectionLoadAddress[RE.SectionID] + RE.Offset;
+ bool isPCRel = (RE.Data >> 24) & 1;
+ unsigned Type = (RE.Data >> 28) & 0xf;
+ unsigned Size = 1 << ((RE.Data >> 25) & 3);
+
+ DEBUG(dbgs() << "Resolving relocation at Section #" << RE.SectionID
+ << " + " << RE.Offset << " (" << format("%p", Target) << ")"
+ << " from Section #" << SectionID << " (" << format("%p", Addr) << ")"
+ << "(" << (isPCRel ? "pcrel" : "absolute")
+ << ", type: " << Type << ", Size: " << Size << ", Addend: "
+ << RE.Addend << ").\n");
+
+ resolveRelocation(Target,
+ FinalTarget,
+ Addr,
+ isPCRel,
+ Type,
+ Size,
+ RE.Addend);
+ }
+ ReferrerList &Refers = Referrers[SectionID];
+ for (unsigned i = 0, e = Refers.size(); i != e; ++i) {
+ Referrer &R = Refers[i];
+ RelocationEntry &RE = Relocations[R.SectionID][R.Index];
+ uint8_t *Target = (uint8_t*)Sections[RE.SectionID].base() + RE.Offset;
+ uint64_t FinalTarget = (uint64_t)SectionLoadAddress[RE.SectionID] + RE.Offset;
+ bool isPCRel = (RE.Data >> 24) & 1;
+ unsigned Type = (RE.Data >> 28) & 0xf;
+ unsigned Size = 1 << ((RE.Data >> 25) & 3);
+
+ DEBUG(dbgs() << "Resolving relocation at Section #" << RE.SectionID
+ << " + " << RE.Offset << " (" << format("%p", Target) << ")"
+ << " from Section #" << SectionID << " (" << format("%p", Addr) << ")"
+ << "(" << (isPCRel ? "pcrel" : "absolute")
+ << ", type: " << Type << ", Size: " << Size << ", Addend: "
+ << RE.Addend << ").\n");
+
+ resolveRelocation(Target,
+ FinalTarget,
+ Addr,
+ isPCRel,
+ Type,
+ Size,
+ RE.Addend);
+ }
+}
+
+bool RuntimeDyldMachO::isKnownFormat(const MemoryBuffer *InputBuffer) {
StringRef Magic = InputBuffer->getBuffer().slice(0, 4);
if (Magic == "\xFE\xED\xFA\xCE") return true;
if (Magic == "\xCE\xFA\xED\xFE") return true;