#include "llvm/Support/COFF.h"
#include "../RuntimeDyldCOFF.h"
-using namespace llvm;
+#define DEBUG_TYPE "dyld"
namespace llvm {
SmallVector<SID, 2> RegisteredEHFrameSections;
public:
- RuntimeDyldCOFFX86_64(RTDyldMemoryManager *MM) : RuntimeDyldCOFF(MM) {}
+ RuntimeDyldCOFFX86_64(RuntimeDyld::MemoryManager &MM,
+ RuntimeDyld::SymbolResolver &Resolver)
+ : RuntimeDyldCOFF(MM, Resolver) {}
unsigned getMaxStubSize() override {
return 6; // 2-byte jmp instruction + 32-bit relative address
}
- void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override;
+ // The target location for the relocation is described by RE.SectionID and
+ // RE.Offset. RE.SectionID can be used to find the SectionEntry. Each
+ // SectionEntry has three members describing its location.
+ // SectionEntry::Address is the address at which the section has been loaded
+ // into memory in the current (host) process. SectionEntry::LoadAddress is
+ // the address that the section will have in the target process.
+ // SectionEntry::ObjAddress is the address of the bits for this section in the
+ // original emitted object image (also in the current address space).
+ //
+ // Relocations will be applied as if the section were loaded at
+ // SectionEntry::LoadAddress, but they will be applied at an address based
+ // on SectionEntry::Address. SectionEntry::ObjAddress will be used to refer
+ // to Target memory contents if they are required for value calculations.
+ //
+ // The Value parameter here is the load address of the symbol for the
+ // relocation to be applied. For relocations which refer to symbols in the
+ // current object Value will be the LoadAddress of the section in which
+ // the symbol resides (RE.Addend provides additional information about the
+ // symbol location). For external symbols, Value will be the address of the
+ // symbol in the target address space.
+ void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override {
+ const SectionEntry &Section = Sections[RE.SectionID];
+ uint8_t *Target = Section.Address + RE.Offset;
+
+ switch (RE.RelType) {
+
+ case COFF::IMAGE_REL_AMD64_REL32:
+ case COFF::IMAGE_REL_AMD64_REL32_1:
+ case COFF::IMAGE_REL_AMD64_REL32_2:
+ case COFF::IMAGE_REL_AMD64_REL32_3:
+ case COFF::IMAGE_REL_AMD64_REL32_4:
+ case COFF::IMAGE_REL_AMD64_REL32_5: {
+ uint32_t *TargetAddress = (uint32_t *)Target;
+ uint64_t FinalAddress = Section.LoadAddress + RE.Offset;
+ // Delta is the distance from the start of the reloc to the end of the
+ // instruction with the reloc.
+ uint64_t Delta = 4 + (RE.RelType - COFF::IMAGE_REL_AMD64_REL32);
+ Value -= FinalAddress + Delta;
+ uint64_t Result = Value + RE.Addend;
+ assert(((int64_t)Result <= INT32_MAX) && "Relocation overflow");
+ assert(((int64_t)Result >= INT32_MIN) && "Relocation underflow");
+ *TargetAddress = Result;
+ break;
+ }
+
+ case COFF::IMAGE_REL_AMD64_ADDR32NB: {
+ // Note ADDR32NB requires a well-established notion of
+ // image base. This address must be less than or equal
+ // to every section's load address, and all sections must be
+ // within a 32 bit offset from the base.
+ //
+ // For now we just set these to zero.
+ uint32_t *TargetAddress = (uint32_t *)Target;
+ *TargetAddress = 0;
+ break;
+ }
+
+ case COFF::IMAGE_REL_AMD64_ADDR64: {
+ uint64_t *TargetAddress = (uint64_t *)Target;
+ *TargetAddress = Value + RE.Addend;
+ break;
+ }
+
+ default:
+ llvm_unreachable("Relocation type not implemented yet!");
+ break;
+ }
+ }
relocation_iterator processRelocationRef(unsigned SectionID,
relocation_iterator RelI,
const ObjectFile &Obj,
ObjSectionToIDMap &ObjSectionToID,
- StubMap &Stubs) override;
+ StubMap &Stubs) override {
+ // If possible, find the symbol referred to in the relocation,
+ // and the section that contains it.
+ symbol_iterator Symbol = RelI->getSymbol();
+ if (Symbol == Obj.symbol_end())
+ report_fatal_error("Unknown symbol in relocation");
+ section_iterator SecI(Obj.section_end());
+ Symbol->getSection(SecI);
+ // If there is no section, this must be an external reference.
+ const bool IsExtern = SecI == Obj.section_end();
+
+ // Determine the Addend used to adjust the relocation value.
+ uint64_t RelType = RelI->getType();
+ uint64_t Offset = RelI->getOffset();
+ uint64_t Addend = 0;
+ SectionEntry &Section = Sections[SectionID];
+ uintptr_t ObjTarget = Section.ObjAddress + Offset;
+
+ switch (RelType) {
+
+ case COFF::IMAGE_REL_AMD64_REL32:
+ case COFF::IMAGE_REL_AMD64_REL32_1:
+ case COFF::IMAGE_REL_AMD64_REL32_2:
+ case COFF::IMAGE_REL_AMD64_REL32_3:
+ case COFF::IMAGE_REL_AMD64_REL32_4:
+ case COFF::IMAGE_REL_AMD64_REL32_5:
+ case COFF::IMAGE_REL_AMD64_ADDR32NB: {
+ uint32_t *Displacement = (uint32_t *)ObjTarget;
+ Addend = *Displacement;
+ break;
+ }
+
+ case COFF::IMAGE_REL_AMD64_ADDR64: {
+ uint64_t *Displacement = (uint64_t *)ObjTarget;
+ Addend = *Displacement;
+ break;
+ }
+
+ default:
+ break;
+ }
+
+ ErrorOr<StringRef> TargetNameOrErr = Symbol->getName();
+ if (std::error_code EC = TargetNameOrErr.getError())
+ report_fatal_error(EC.message());
+ StringRef TargetName = *TargetNameOrErr;
+
+ DEBUG(dbgs() << "\t\tIn Section " << SectionID << " Offset " << Offset
+ << " RelType: " << RelType << " TargetName: " << TargetName
+ << " Addend " << Addend << "\n");
+
+ if (IsExtern) {
+ RelocationEntry RE(SectionID, Offset, RelType, Addend);
+ addRelocationForSymbol(RE, TargetName);
+ } else {
+ bool IsCode = SecI->isText();
+ unsigned TargetSectionID =
+ findOrEmitSection(Obj, *SecI, IsCode, ObjSectionToID);
+ uint64_t TargetOffset = getSymbolOffset(*Symbol);
+ RelocationEntry RE(SectionID, Offset, RelType, TargetOffset + Addend);
+ addRelocationForSection(RE, TargetSectionID);
+ }
+
+ return ++RelI;
+ }
unsigned getStubAlignment() override { return 1; }
- void registerEHFrames() override;
- void deregisterEHFrames() override;
+ void registerEHFrames() override {
+ for (auto const &EHFrameSID : UnregisteredEHFrameSections) {
+ uint8_t *EHFrameAddr = Sections[EHFrameSID].Address;
+ uint64_t EHFrameLoadAddr = Sections[EHFrameSID].LoadAddress;
+ size_t EHFrameSize = Sections[EHFrameSID].Size;
+ MemMgr.registerEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
+ RegisteredEHFrameSections.push_back(EHFrameSID);
+ }
+ UnregisteredEHFrameSections.clear();
+ }
+ void deregisterEHFrames() override {
+ // Stub
+ }
void finalizeLoad(const ObjectFile &Obj,
- ObjSectionToIDMap &SectionMap) override;
+ ObjSectionToIDMap &SectionMap) override {
+ // Look for and record the EH frame section IDs.
+ for (const auto &SectionPair : SectionMap) {
+ const SectionRef &Section = SectionPair.first;
+ StringRef Name;
+ Check(Section.getName(Name));
+ // Note unwind info is split across .pdata and .xdata, so this
+ // may not be sufficiently general for all users.
+ if (Name == ".xdata") {
+ UnregisteredEHFrameSections.push_back(SectionPair.second);
+ }
+ }
+ }
};
} // end namespace llvm