#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/IntervalMap.h"
-#include "RuntimeDyldImpl.h"
+#include "RuntimeDyldELF.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/ELF.h"
#include "llvm/ADT/Triple.h"
+#include "llvm/Object/ELF.h"
+#include "JITRegistrar.h"
using namespace llvm;
using namespace llvm::object;
-namespace llvm {
-
namespace {
-// FIXME: this function should probably not live here...
-//
-// Returns the name and address of an unrelocated symbol in an ELF section
-void getSymbolInfo(symbol_iterator Sym, uint64_t &Addr, StringRef &Name) {
- //FIXME: error checking here required to catch corrupt ELF objects...
- error_code Err = Sym->getName(Name);
+template<support::endianness target_endianness, bool is64Bits>
+class DyldELFObject : public ELFObjectFile<target_endianness, is64Bits> {
+ LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits)
- uint64_t AddrInSection;
- Err = Sym->getAddress(AddrInSection);
+ typedef Elf_Shdr_Impl<target_endianness, is64Bits> Elf_Shdr;
+ typedef Elf_Sym_Impl<target_endianness, is64Bits> Elf_Sym;
+ typedef Elf_Rel_Impl<target_endianness, is64Bits, false> Elf_Rel;
+ typedef Elf_Rel_Impl<target_endianness, is64Bits, true> Elf_Rela;
- SectionRef empty_section;
- section_iterator Section(empty_section);
- Err = Sym->getSection(Section);
+ typedef typename ELFObjectFile<target_endianness, is64Bits>::
+ Elf_Ehdr Elf_Ehdr;
- StringRef SectionContents;
- Section->getContents(SectionContents);
+ typedef typename ELFDataTypeTypedefHelper<
+ target_endianness, is64Bits>::value_type addr_type;
- Addr = reinterpret_cast<uint64_t>(SectionContents.data()) + AddrInSection;
-}
+protected:
+ // This duplicates the 'Data' member in the 'Binary' base class
+ // but it is necessary to workaround a bug in gcc 4.2
+ MemoryBuffer *InputData;
-}
+public:
+ DyldELFObject(MemoryBuffer *Object, error_code &ec);
+
+ void updateSectionAddress(const SectionRef &Sec, uint64_t Addr);
+ void updateSymbolAddress(const SymbolRef &Sym, uint64_t Addr);
+
+ const MemoryBuffer& getBuffer() const { return *InputData; }
-bool RuntimeDyldELF::loadObject(MemoryBuffer *InputBuffer) {
- if (!isCompatibleFormat(InputBuffer))
+ // Methods for type inquiry through isa, cast, and dyn_cast
+ static inline bool classof(const Binary *v) {
+ return (isa<ELFObjectFile<target_endianness, is64Bits> >(v)
+ && classof(cast<ELFObjectFile<target_endianness, is64Bits> >(v)));
+ }
+ static inline bool classof(
+ const ELFObjectFile<target_endianness, is64Bits> *v) {
+ return v->isDyldType();
+ }
+ static inline bool classof(const DyldELFObject *v) {
return true;
+ }
+};
+
+template<support::endianness target_endianness, bool is64Bits>
+class ELFObjectImage : public ObjectImage {
+ protected:
+ DyldELFObject<target_endianness, is64Bits> *DyldObj;
+ bool Registered;
+
+ public:
+ ELFObjectImage(DyldELFObject<target_endianness, is64Bits> *Obj)
+ : ObjectImage(Obj),
+ DyldObj(Obj),
+ Registered(false) {}
+
+ virtual ~ELFObjectImage() {
+ if (Registered)
+ deregisterWithDebugger();
+ }
- OwningPtr<ObjectFile> Obj(ObjectFile::createELFObjectFile(InputBuffer));
-
- Arch = Obj->getArch();
-
- // Map address in the Object file image to function names
- IntervalMap<uint64_t, StringRef>::Allocator A;
- IntervalMap<uint64_t, StringRef> FuncMap(A);
-
- // This is a bit of a hack. The ObjectFile we've just loaded reports
- // section addresses as 0 and doesn't provide access to the section
- // offset (from which we could calculate the address. Instead,
- // we're storing the address when it comes up in the ST_Debug case
- // below.
- //
- StringMap<uint64_t> DebugSymbolMap;
-
- symbol_iterator SymEnd = Obj->end_symbols();
- error_code Err;
- for (symbol_iterator Sym = Obj->begin_symbols();
- Sym != SymEnd; Sym.increment(Err)) {
- SymbolRef::Type Type;
- Sym->getType(Type);
- if (Type == SymbolRef::ST_Function) {
- StringRef Name;
- uint64_t Addr;
- getSymbolInfo(Sym, Addr, Name);
-
- uint64_t Size;
- Err = Sym->getSize(Size);
-
- uint8_t *Start;
- uint8_t *End;
- Start = reinterpret_cast<uint8_t*>(Addr);
- End = reinterpret_cast<uint8_t*>(Addr + Size - 1);
-
- extractFunction(Name, Start, End);
- FuncMap.insert(Addr, Addr + Size - 1, Name);
- } else if (Type == SymbolRef::ST_Debug) {
- // This case helps us find section addresses
- StringRef Name;
- uint64_t Addr;
- getSymbolInfo(Sym, Addr, Name);
- DebugSymbolMap[Name] = Addr;
+ // Subclasses can override these methods to update the image with loaded
+ // addresses for sections and common symbols
+ virtual void updateSectionAddress(const SectionRef &Sec, uint64_t Addr)
+ {
+ DyldObj->updateSectionAddress(Sec, Addr);
}
- }
- // Iterate through the relocations for this object
- section_iterator SecEnd = Obj->end_sections();
- for (section_iterator Sec = Obj->begin_sections();
- Sec != SecEnd; Sec.increment(Err)) {
- StringRef SecName;
- uint64_t SecAddr;
- Sec->getName(SecName);
- // Ignore sections that aren't in our map
- if (DebugSymbolMap.find(SecName) == DebugSymbolMap.end()) {
- continue;
+ virtual void updateSymbolAddress(const SymbolRef &Sym, uint64_t Addr)
+ {
+ DyldObj->updateSymbolAddress(Sym, Addr);
}
- SecAddr = DebugSymbolMap[SecName];
- relocation_iterator RelEnd = Sec->end_relocations();
- for (relocation_iterator Rel = Sec->begin_relocations();
- Rel != RelEnd; Rel.increment(Err)) {
- uint64_t RelOffset;
- uint64_t RelType;
- int64_t RelAddend;
- SymbolRef RelSym;
- StringRef SymName;
- uint64_t SymAddr;
- uint64_t SymOffset;
-
- Rel->getAddress(RelOffset);
- Rel->getType(RelType);
- Rel->getAdditionalInfo(RelAddend);
- Rel->getSymbol(RelSym);
- RelSym.getName(SymName);
- RelSym.getAddress(SymAddr);
- RelSym.getFileOffset(SymOffset);
-
- // If this relocation is inside a function, we want to store the
- // function name and a function-relative offset
- IntervalMap<uint64_t, StringRef>::iterator ContainingFunc
- = FuncMap.find(SecAddr + RelOffset);
- if (ContainingFunc.valid()) {
- // Re-base the relocation to make it relative to the target function
- RelOffset = (SecAddr + RelOffset) - ContainingFunc.start();
- Relocations[SymName].push_back(RelocationEntry(ContainingFunc.value(),
- RelOffset,
- RelType,
- RelAddend,
- true));
- } else {
- Relocations[SymName].push_back(RelocationEntry(SecName,
- RelOffset,
- RelType,
- RelAddend,
- false));
- }
+
+ virtual void registerWithDebugger()
+ {
+ JITRegistrar::getGDBRegistrar().registerObject(DyldObj->getBuffer());
+ Registered = true;
}
- }
- return false;
+ virtual void deregisterWithDebugger()
+ {
+ JITRegistrar::getGDBRegistrar().deregisterObject(DyldObj->getBuffer());
+ }
+};
+
+template<support::endianness target_endianness, bool is64Bits>
+DyldELFObject<target_endianness, is64Bits>::DyldELFObject(MemoryBuffer *Object,
+ error_code &ec)
+ : ELFObjectFile<target_endianness, is64Bits>(Object, ec),
+ InputData(Object) {
+ this->isDyldELFObject = true;
}
-void RuntimeDyldELF::resolveRelocations() {
- // FIXME: deprecated. should be changed to use the by-section
- // allocation and relocation scheme.
-
- // Just iterate over the symbols in our symbol table and assign their
- // addresses.
- StringMap<SymbolLoc>::iterator i = SymbolTable.begin();
- StringMap<SymbolLoc>::iterator e = SymbolTable.end();
- for (;i != e; ++i) {
- assert (i->getValue().second == 0 && "non-zero offset in by-function sym!");
- reassignSymbolAddress(i->getKey(),
- (uint8_t*)Sections[i->getValue().first].base());
- }
+template<support::endianness target_endianness, bool is64Bits>
+void DyldELFObject<target_endianness, is64Bits>::updateSectionAddress(
+ const SectionRef &Sec,
+ uint64_t Addr) {
+ DataRefImpl ShdrRef = Sec.getRawDataRefImpl();
+ Elf_Shdr *shdr = const_cast<Elf_Shdr*>(
+ reinterpret_cast<const Elf_Shdr *>(ShdrRef.p));
+
+ // This assumes the address passed in matches the target address bitness
+ // The template-based type cast handles everything else.
+ shdr->sh_addr = static_cast<addr_type>(Addr);
}
-void RuntimeDyldELF::resolveX86_64Relocation(StringRef Name,
- uint8_t *Addr,
- const RelocationEntry &RE) {
- uint8_t *TargetAddr;
- if (RE.IsFunctionRelative) {
- StringMap<SymbolLoc>::const_iterator Loc = SymbolTable.find(RE.Target);
- assert(Loc != SymbolTable.end() && "Function for relocation not found");
- TargetAddr =
- reinterpret_cast<uint8_t*>(Sections[Loc->second.first].base()) +
- Loc->second.second + RE.Offset;
- } else {
- // FIXME: Get the address of the target section and add that to RE.Offset
- assert(0 && ("Non-function relocation not implemented yet!"));
+template<support::endianness target_endianness, bool is64Bits>
+void DyldELFObject<target_endianness, is64Bits>::updateSymbolAddress(
+ const SymbolRef &SymRef,
+ uint64_t Addr) {
+
+ Elf_Sym *sym = const_cast<Elf_Sym*>(
+ ELFObjectFile<target_endianness, is64Bits>::
+ getSymbol(SymRef.getRawDataRefImpl()));
+
+ // This assumes the address passed in matches the target address bitness
+ // The template-based type cast handles everything else.
+ sym->st_value = static_cast<addr_type>(Addr);
+}
+
+} // namespace
+
+
+namespace llvm {
+
+ObjectImage *RuntimeDyldELF::createObjectImage(
+ const MemoryBuffer *ConstInputBuffer) {
+ MemoryBuffer *InputBuffer = const_cast<MemoryBuffer*>(ConstInputBuffer);
+ std::pair<unsigned char, unsigned char> Ident = getElfArchType(InputBuffer);
+ error_code ec;
+
+ if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) {
+ DyldELFObject<support::little, false> *Obj =
+ new DyldELFObject<support::little, false>(InputBuffer, ec);
+ return new ELFObjectImage<support::little, false>(Obj);
+ }
+ else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) {
+ DyldELFObject<support::big, false> *Obj =
+ new DyldELFObject<support::big, false>(InputBuffer, ec);
+ return new ELFObjectImage<support::big, false>(Obj);
}
+ else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) {
+ DyldELFObject<support::big, true> *Obj =
+ new DyldELFObject<support::big, true>(InputBuffer, ec);
+ return new ELFObjectImage<support::big, true>(Obj);
+ }
+ else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) {
+ DyldELFObject<support::little, true> *Obj =
+ new DyldELFObject<support::little, true>(InputBuffer, ec);
+ return new ELFObjectImage<support::little, true>(Obj);
+ }
+ else
+ llvm_unreachable("Unexpected ELF format");
+}
+
+void RuntimeDyldELF::handleObjectLoaded(ObjectImage *Obj)
+{
+ Obj->registerWithDebugger();
+ // Save the loaded object. It will deregister itself when deleted
+ LoadedObject = Obj;
+}
+
+RuntimeDyldELF::~RuntimeDyldELF() {
+ if (LoadedObject)
+ delete LoadedObject;
+}
- switch (RE.Type) {
+void RuntimeDyldELF::resolveX86_64Relocation(uint8_t *LocalAddress,
+ uint64_t FinalAddress,
+ uint64_t Value,
+ uint32_t Type,
+ int64_t Addend) {
+ switch (Type) {
default:
- assert(0 && ("Relocation type not implemented yet!"));
+ llvm_unreachable("Relocation type not implemented yet!");
break;
case ELF::R_X86_64_64: {
- uint8_t **Target = reinterpret_cast<uint8_t**>(TargetAddr);
- *Target = Addr + RE.Addend;
+ uint64_t *Target = (uint64_t*)(LocalAddress);
+ *Target = Value + Addend;
break;
}
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S: {
- uint64_t Value = reinterpret_cast<uint64_t>(Addr) + RE.Addend;
+ Value += Addend;
// FIXME: Handle the possibility of this assertion failing
- assert((RE.Type == ELF::R_X86_64_32 && !(Value & 0xFFFFFFFF00000000ULL)) ||
- (RE.Type == ELF::R_X86_64_32S &&
+ assert((Type == ELF::R_X86_64_32 && !(Value & 0xFFFFFFFF00000000ULL)) ||
+ (Type == ELF::R_X86_64_32S &&
(Value & 0xFFFFFFFF00000000ULL) == 0xFFFFFFFF00000000ULL));
uint32_t TruncatedAddr = (Value & 0xFFFFFFFF);
- uint32_t *Target = reinterpret_cast<uint32_t*>(TargetAddr);
+ uint32_t *Target = reinterpret_cast<uint32_t*>(LocalAddress);
*Target = TruncatedAddr;
break;
}
case ELF::R_X86_64_PC32: {
- uint32_t *Placeholder = reinterpret_cast<uint32_t*>(TargetAddr);
- uint64_t RealOffset = *Placeholder +
- reinterpret_cast<uint64_t>(Addr) +
- RE.Addend - reinterpret_cast<uint64_t>(TargetAddr);
- assert((RealOffset & 0xFFFFFFFF) == RealOffset);
- uint32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
+ uint32_t *Placeholder = reinterpret_cast<uint32_t*>(LocalAddress);
+ int64_t RealOffset = *Placeholder + Value + Addend - FinalAddress;
+ assert(RealOffset <= 214783647 && RealOffset >= -214783648);
+ int32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
*Placeholder = TruncOffset;
break;
}
}
}
-void RuntimeDyldELF::resolveX86Relocation(StringRef Name,
- uint8_t *Addr,
- const RelocationEntry &RE) {
- uint8_t *TargetAddr;
- if (RE.IsFunctionRelative) {
- StringMap<SymbolLoc>::const_iterator Loc = SymbolTable.find(RE.Target);
- assert(Loc != SymbolTable.end() && "Function for relocation not found");
- TargetAddr =
- reinterpret_cast<uint8_t*>(Sections[Loc->second.first].base()) +
- Loc->second.second + RE.Offset;
- } else {
- // FIXME: Get the address of the target section and add that to RE.Offset
- assert(0 && ("Non-function relocation not implemented yet!"));
- }
-
- switch (RE.Type) {
+void RuntimeDyldELF::resolveX86Relocation(uint8_t *LocalAddress,
+ uint32_t FinalAddress,
+ uint32_t Value,
+ uint32_t Type,
+ int32_t Addend) {
+ switch (Type) {
case ELF::R_386_32: {
- uint8_t **Target = reinterpret_cast<uint8_t**>(TargetAddr);
- *Target = Addr + RE.Addend;
+ uint32_t *Target = (uint32_t*)(LocalAddress);
+ uint32_t Placeholder = *Target;
+ *Target = Placeholder + Value + Addend;
break;
}
case ELF::R_386_PC32: {
- uint32_t *Placeholder = reinterpret_cast<uint32_t*>(TargetAddr);
- uint32_t RealOffset = *Placeholder + reinterpret_cast<uintptr_t>(Addr) +
- RE.Addend - reinterpret_cast<uintptr_t>(TargetAddr);
+ uint32_t *Placeholder = reinterpret_cast<uint32_t*>(LocalAddress);
+ uint32_t RealOffset = *Placeholder + Value + Addend - FinalAddress;
*Placeholder = RealOffset;
break;
}
default:
// There are other relocation types, but it appears these are the
// only ones currently used by the LLVM ELF object writer
- assert(0 && ("Relocation type not implemented yet!"));
+ llvm_unreachable("Relocation type not implemented yet!");
break;
}
}
-void RuntimeDyldELF::resolveArmRelocation(StringRef Name,
- uint8_t *Addr,
- const RelocationEntry &RE) {
+void RuntimeDyldELF::resolveARMRelocation(uint8_t *LocalAddress,
+ uint32_t FinalAddress,
+ uint32_t Value,
+ uint32_t Type,
+ int32_t Addend) {
+ // TODO: Add Thumb relocations.
+ uint32_t* TargetPtr = (uint32_t*)LocalAddress;
+ Value += Addend;
+
+ DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: " << LocalAddress
+ << " FinalAddress: " << format("%p",FinalAddress)
+ << " Value: " << format("%x",Value)
+ << " Type: " << format("%x",Type)
+ << " Addend: " << format("%x",Addend)
+ << "\n");
+
+ switch(Type) {
+ default:
+ llvm_unreachable("Not implemented relocation type!");
+
+ // Just write 32bit value to relocation address
+ case ELF::R_ARM_ABS32 :
+ *TargetPtr = Value;
+ break;
+
+ // Write first 16 bit of 32 bit value to the mov instruction.
+ // Last 4 bit should be shifted.
+ case ELF::R_ARM_MOVW_ABS_NC :
+ Value = Value & 0xFFFF;
+ *TargetPtr |= Value & 0xFFF;
+ *TargetPtr |= ((Value >> 12) & 0xF) << 16;
+ break;
+
+ // Write last 16 bit of 32 bit value to the mov instruction.
+ // Last 4 bit should be shifted.
+ case ELF::R_ARM_MOVT_ABS :
+ Value = (Value >> 16) & 0xFFFF;
+ *TargetPtr |= Value & 0xFFF;
+ *TargetPtr |= ((Value >> 12) & 0xF) << 16;
+ break;
+
+ // Write 24 bit relative value to the branch instruction.
+ case ELF::R_ARM_PC24 : // Fall through.
+ case ELF::R_ARM_CALL : // Fall through.
+ case ELF::R_ARM_JUMP24 :
+ int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8);
+ RelValue = (RelValue & 0x03FFFFFC) >> 2;
+ *TargetPtr &= 0xFF000000;
+ *TargetPtr |= RelValue;
+ break;
+ }
}
-void RuntimeDyldELF::resolveRelocation(StringRef Name,
- uint8_t *Addr,
- const RelocationEntry &RE) {
+void RuntimeDyldELF::resolveRelocation(uint8_t *LocalAddress,
+ uint64_t FinalAddress,
+ uint64_t Value,
+ uint32_t Type,
+ int64_t Addend) {
switch (Arch) {
case Triple::x86_64:
- resolveX86_64Relocation(Name, Addr, RE);
+ resolveX86_64Relocation(LocalAddress, FinalAddress, Value, Type, Addend);
break;
case Triple::x86:
- resolveX86Relocation(Name, Addr, RE);
- break;
- case Triple::arm:
- resolveArmRelocation(Name, Addr, RE);
+ resolveX86Relocation(LocalAddress, (uint32_t)(FinalAddress & 0xffffffffL),
+ (uint32_t)(Value & 0xffffffffL), Type,
+ (uint32_t)(Addend & 0xffffffffL));
break;
- default:
- assert(0 && "Unsupported CPU type!");
+ case Triple::arm: // Fall through.
+ case Triple::thumb:
+ resolveARMRelocation(LocalAddress, (uint32_t)(FinalAddress & 0xffffffffL),
+ (uint32_t)(Value & 0xffffffffL), Type,
+ (uint32_t)(Addend & 0xffffffffL));
break;
+ default: llvm_unreachable("Unsupported CPU type!");
}
}
-void RuntimeDyldELF::reassignSymbolAddress(StringRef Name, uint8_t *Addr) {
- // FIXME: deprecated. switch to reassignSectionAddress() instead.
- //
- // Actually moving the symbol address requires by-section mapping.
- assert(Sections[SymbolTable.lookup(Name).first].base() == (void*)Addr &&
- "Unable to relocate section in by-function JIT allocation model!");
-
- RelocationList &Relocs = Relocations[Name];
- for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
- RelocationEntry &RE = Relocs[i];
- resolveRelocation(Name, Addr, RE);
+void RuntimeDyldELF::processRelocationRef(const ObjRelocationInfo &Rel,
+ ObjectImage &Obj,
+ ObjSectionToIDMap &ObjSectionToID,
+ LocalSymbolMap &Symbols,
+ StubMap &Stubs) {
+
+ uint32_t RelType = (uint32_t)(Rel.Type & 0xffffffffL);
+ intptr_t Addend = (intptr_t)Rel.AdditionalInfo;
+ RelocationValueRef Value;
+ StringRef TargetName;
+ const SymbolRef &Symbol = Rel.Symbol;
+ Symbol.getName(TargetName);
+ DEBUG(dbgs() << "\t\tRelType: " << RelType
+ << " Addend: " << Addend
+ << " TargetName: " << TargetName
+ << "\n");
+ // 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 {
+ SymbolRef::Type SymType;
+ Symbol.getType(SymType);
+ switch (SymType) {
+ case SymbolRef::ST_Debug: {
+ // TODO: Now ELF SymbolRef::ST_Debug = STT_SECTION, it's not obviously
+ // and can be changed by another developers. Maybe best way is add
+ // a new symbol type ST_Section to SymbolRef and use it.
+ section_iterator si = Obj.end_sections();
+ Symbol.getSection(si);
+ if (si == Obj.end_sections())
+ llvm_unreachable("Symbol section not found, bad object file format!");
+ DEBUG(dbgs() << "\t\tThis is section symbol\n");
+ Value.SectionID = findOrEmitSection(Obj, (*si), true, ObjSectionToID);
+ Value.Addend = Addend;
+ break;
+ }
+ case SymbolRef::ST_Unknown: {
+ Value.SymbolName = TargetName.data();
+ Value.Addend = Addend;
+ break;
+ }
+ default:
+ llvm_unreachable("Unresolved symbol type!");
+ break;
+ }
+ }
}
-}
-
-// Assign an address to a symbol name and resolve all the relocations
-// associated with it.
-void RuntimeDyldELF::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.
- assert(0);
+ DEBUG(dbgs() << "\t\tRel.SectionID: " << Rel.SectionID
+ << " Rel.Offset: " << Rel.Offset
+ << "\n");
+ if (Arch == Triple::arm &&
+ (RelType == ELF::R_ARM_PC24 ||
+ RelType == ELF::R_ARM_CALL ||
+ RelType == ELF::R_ARM_JUMP24)) {
+ // This is an ARM branch relocation, need to use a stub function.
+ DEBUG(dbgs() << "\t\tThis is an ARM branch relocation.");
+ SectionEntry &Section = Sections[Rel.SectionID];
+ uint8_t *Target = Section.Address + Rel.Offset;
+
+ // Look up for existing stub.
+ StubMap::const_iterator i = Stubs.find(Value);
+ if (i != Stubs.end()) {
+ resolveRelocation(Target, Section.LoadAddress, (uint64_t)Section.Address +
+ i->second, RelType, 0);
+ DEBUG(dbgs() << " Stub function found\n");
+ } else {
+ // Create a new stub function.
+ DEBUG(dbgs() << " Create a new stub function\n");
+ Stubs[Value] = Section.StubOffset;
+ uint8_t *StubTargetAddr = createStubFunction(Section.Address +
+ Section.StubOffset);
+ AddRelocation(Value, Rel.SectionID,
+ StubTargetAddr - Section.Address, ELF::R_ARM_ABS32);
+ resolveRelocation(Target, Section.LoadAddress, (uint64_t)Section.Address +
+ Section.StubOffset, RelType, 0);
+ Section.StubOffset += getMaxStubSize();
+ }
+ } else
+ AddRelocation(Value, Rel.SectionID, Rel.Offset, RelType);
}
bool RuntimeDyldELF::isCompatibleFormat(const MemoryBuffer *InputBuffer) const {