void COFFDumper::printRelocation(const SectionRef &Section,
const RelocationRef &Reloc) {
uint64_t Offset = Reloc.getOffset();
uint64_t RelocType = Reloc.getType();
SmallString<32> RelocName;
StringRef SymbolName;
Reloc.getTypeName(RelocName);
symbol_iterator Symbol = Reloc.getSymbol();
if (Symbol != Obj->symbol_end()) {
ErrorOr<StringRef> SymbolNameOrErr = Symbol->getName();
error(SymbolNameOrErr.getError());
SymbolName = *SymbolNameOrErr;
}
if (opts::ExpandRelocs) {
DictScope Group(W, "Relocation");
W.printHex("Offset", Offset);
W.printNumber("Type", RelocName, RelocType);
W.printString("Symbol", SymbolName.empty() ? "-" : SymbolName);
} else {
raw_ostream& OS = W.startLine();
OS << W.hex(Offset)
<< " " << RelocName
<< " " << (SymbolName.empty() ? "-" : SymbolName)
<< "\n";
}
}
void COFFDumper::printRelocation(const SectionRef &Section,
const RelocationRef &Reloc) {
uint64_t Offset;
uint64_t RelocType;
SmallString<32> RelocName;
StringRef SymbolName;
StringRef Contents;
if (error(Reloc.getOffset(Offset)))
return;
if (error(Reloc.getType(RelocType)))
return;
if (error(Reloc.getTypeName(RelocName)))
return;
symbol_iterator Symbol = Reloc.getSymbol();
if (error(Symbol->getName(SymbolName)))
return;
if (error(Section.getContents(Contents)))
return;
if (opts::ExpandRelocs) {
DictScope Group(W, "Relocation");
W.printHex("Offset", Offset);
W.printNumber("Type", RelocName, RelocType);
W.printString("Symbol", SymbolName.size() > 0 ? SymbolName : "-");
} else {
raw_ostream& OS = W.startLine();
OS << W.hex(Offset)
<< " " << RelocName
<< " " << (SymbolName.size() > 0 ? SymbolName : "-")
<< "\n";
}
}
void RuntimeDyldMachO::processRelocationRef(unsigned SectionID,
RelocationRef RelI,
ObjectImage &Obj,
ObjSectionToIDMap &ObjSectionToID,
const SymbolTableMap &Symbols,
StubMap &Stubs) {
const ObjectFile *OF = Obj.getObjectFile();
const MachOObjectFile *MachO = static_cast<const MachOObjectFile*>(OF);
MachO::any_relocation_info RE= MachO->getRelocation(RelI.getRawDataRefImpl());
uint32_t RelType = MachO->getAnyRelocationType(RE);
// FIXME: Properly handle scattered relocations.
// For now, optimistically skip these: they can often be ignored, as
// the static linker will already have applied the relocation, and it
// only needs to be reapplied if symbols move relative to one another.
// Note: This will fail horribly where the relocations *do* need to be
// applied, but that was already the case.
if (MachO->isRelocationScattered(RE))
return;
RelocationValueRef Value;
SectionEntry &Section = Sections[SectionID];
bool isExtern = MachO->getPlainRelocationExternal(RE);
bool IsPCRel = MachO->getAnyRelocationPCRel(RE);
unsigned Size = MachO->getAnyRelocationLength(RE);
uint64_t Offset;
RelI.getOffset(Offset);
uint8_t *LocalAddress = Section.Address + Offset;
unsigned NumBytes = 1 << Size;
uint64_t Addend = 0;
memcpy(&Addend, LocalAddress, NumBytes);
if (isExtern) {
// Obtain the symbol name which is referenced in the relocation
symbol_iterator Symbol = RelI.getSymbol();
StringRef TargetName;
Symbol->getName(TargetName);
// First search for the symbol in the local symbol table
SymbolTableMap::const_iterator lsi = Symbols.find(TargetName.data());
if (lsi != Symbols.end()) {
Value.SectionID = lsi->second.first;
Value.Addend = lsi->second.second + Addend;
} else {
// Search for the symbol in the global symbol table
SymbolTableMap::const_iterator gsi = GlobalSymbolTable.find(TargetName.data());
if (gsi != GlobalSymbolTable.end()) {
Value.SectionID = gsi->second.first;
Value.Addend = gsi->second.second + Addend;
} else {
Value.SymbolName = TargetName.data();
Value.Addend = Addend;
}
}
} else {
SectionRef Sec = MachO->getRelocationSection(RE);
bool IsCode = false;
Sec.isText(IsCode);
Value.SectionID = findOrEmitSection(Obj, Sec, IsCode, ObjSectionToID);
uint64_t Addr;
Sec.getAddress(Addr);
Value.Addend = Addend - Addr;
if (IsPCRel)
Value.Addend += Offset + NumBytes;
}
if (Arch == Triple::x86_64 && (RelType == MachO::X86_64_RELOC_GOT ||
RelType == MachO::X86_64_RELOC_GOT_LOAD)) {
assert(IsPCRel);
assert(Size == 2);
StubMap::const_iterator i = Stubs.find(Value);
uint8_t *Addr;
if (i != Stubs.end()) {
Addr = Section.Address + i->second;
} else {
Stubs[Value] = Section.StubOffset;
uint8_t *GOTEntry = Section.Address + Section.StubOffset;
RelocationEntry RE(SectionID, Section.StubOffset,
MachO::X86_64_RELOC_UNSIGNED, 0, false, 3);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);
Section.StubOffset += 8;
Addr = GOTEntry;
}
resolveRelocation(Section, Offset, (uint64_t)Addr,
MachO::X86_64_RELOC_UNSIGNED, Value.Addend, true, 2);
} else if (Arch == Triple::arm &&
(RelType & 0xf) == MachO::ARM_RELOC_BR24) {
// This is an ARM branch relocation, need to use a stub function.
// Look up for existing stub.
StubMap::const_iterator i = Stubs.find(Value);
if (i != Stubs.end())
resolveRelocation(Section, Offset,
(uint64_t)Section.Address + i->second,
RelType, 0, IsPCRel, Size);
else {
// Create a new stub function.
Stubs[Value] = Section.StubOffset;
uint8_t *StubTargetAddr = createStubFunction(Section.Address +
Section.StubOffset);
RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
MachO::GENERIC_RELOC_VANILLA, Value.Addend);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);
resolveRelocation(Section, Offset,
(uint64_t)Section.Address + Section.StubOffset,
RelType, 0, IsPCRel, Size);
Section.StubOffset += getMaxStubSize();
}
} else {
RelocationEntry RE(SectionID, Offset, RelType, Value.Addend,
IsPCRel, Size);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);
}
}
bool relocAddressLess(RelocationRef a, RelocationRef b) {
return a.getOffset() < b.getOffset();
}
bool llvm::RelocAddressLess(RelocationRef a, RelocationRef b) {
uint64_t a_addr, b_addr;
if (error(a.getOffset(a_addr))) return false;
if (error(b.getOffset(b_addr))) return false;
return a_addr < b_addr;
}
bool relocAddressLess(RelocationRef a, RelocationRef b) {
uint64_t a_addr, b_addr;
if (error(a.getOffset(a_addr))) exit(ReturnValue);
if (error(b.getOffset(b_addr))) exit(ReturnValue);
return a_addr < b_addr;
}