#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Host.h"
+#include "llvm/Support/Mutex.h"
#include "llvm/Support/SwapByteOrder.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
class ObjectBuffer;
class Twine;
-
/// SectionEntry - represents a section emitted into memory by the dynamic
/// linker.
class SectionEntry {
/// Address - address in the linker's memory where the section resides.
uint8_t *Address;
- /// Size - section size.
+ /// Size - section size. Doesn't include the stubs.
size_t Size;
/// LoadAddress - the address of the section in the target process's memory.
uintptr_t ObjAddress;
SectionEntry(StringRef name, uint8_t *address, size_t size,
- uintptr_t stubOffset, uintptr_t objAddress)
- : Name(name), Address(address), Size(size), LoadAddress((uintptr_t)address),
- StubOffset(stubOffset), ObjAddress(objAddress) {}
+ uintptr_t objAddress)
+ : Name(name), Address(address), Size(size),
+ LoadAddress((uintptr_t)address), StubOffset(size),
+ ObjAddress(objAddress) {}
};
/// RelocationEntry - used to represent relocations internally in the dynamic
unsigned SectionID;
/// Offset - offset into the section.
- uintptr_t Offset;
+ uint64_t Offset;
/// RelType - relocation type.
uint32_t RelType;
/// Addend - the relocation addend encoded in the instruction itself. Also
/// used to make a relocation section relative instead of symbol relative.
- intptr_t Addend;
+ int64_t Addend;
- RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend)
- : SectionID(id), Offset(offset), RelType(type), Addend(addend) {}
-};
+ /// SymOffset - Section offset of the relocation entry's symbol (used for GOT
+ /// lookup).
+ uint64_t SymOffset;
-/// ObjRelocationInfo - relocation information as read from the object file.
-/// Used to pass around data taken from object::RelocationRef, together with
-/// the section to which the relocation points (represented by a SectionID).
-class ObjRelocationInfo {
-public:
- unsigned SectionID;
- uint64_t Offset;
- SymbolRef Symbol;
- uint64_t Type;
- int64_t AdditionalInfo;
+ /// True if this is a PCRel relocation (MachO specific).
+ bool IsPCRel;
+
+ /// The size of this relocation (MachO specific).
+ unsigned Size;
+
+ RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend)
+ : SectionID(id), Offset(offset), RelType(type), Addend(addend),
+ SymOffset(0), IsPCRel(false), Size(0) {}
+
+ RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend,
+ uint64_t symoffset)
+ : SectionID(id), Offset(offset), RelType(type), Addend(addend),
+ SymOffset(symoffset), IsPCRel(false), Size(0) {}
+
+ RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend,
+ bool IsPCRel, unsigned Size)
+ : SectionID(id), Offset(offset), RelType(type), Addend(addend),
+ SymOffset(0), IsPCRel(IsPCRel), Size(Size) {}
};
class RelocationValueRef {
public:
- unsigned SectionID;
- intptr_t Addend;
+ unsigned SectionID;
+ uint64_t Offset;
+ int64_t Addend;
const char *SymbolName;
- RelocationValueRef(): SectionID(0), Addend(0), SymbolName(0) {}
+ RelocationValueRef() : SectionID(0), Offset(0), Addend(0),
+ SymbolName(nullptr) {}
inline bool operator==(const RelocationValueRef &Other) const {
- return std::memcmp(this, &Other, sizeof(RelocationValueRef)) == 0;
+ return SectionID == Other.SectionID && Offset == Other.Offset &&
+ Addend == Other.Addend && SymbolName == Other.SymbolName;
}
- inline bool operator <(const RelocationValueRef &Other) const {
- return std::memcmp(this, &Other, sizeof(RelocationValueRef)) < 0;
+ inline bool operator<(const RelocationValueRef &Other) const {
+ if (SectionID != Other.SectionID)
+ return SectionID < Other.SectionID;
+ if (Offset != Other.Offset)
+ return Offset < Other.Offset;
+ if (Addend != Other.Addend)
+ return Addend < Other.Addend;
+ return SymbolName < Other.SymbolName;
}
};
typedef SmallVector<SectionEntry, 64> SectionList;
SectionList Sections;
+ typedef unsigned SID; // Type for SectionIDs
+#define RTDYLD_INVALID_SECTION_ID ((SID)(-1))
+
// Keep a map of sections from object file to the SectionID which
// references it.
typedef std::map<SectionRef, unsigned> ObjSectionToIDMap;
typedef std::map<RelocationValueRef, uintptr_t> StubMap;
Triple::ArchType Arch;
-
- inline unsigned getMaxStubSize() {
- if (Arch == Triple::arm || Arch == Triple::thumb)
- return 8; // 32-bit instruction and 32-bit address
- else if (Arch == Triple::mipsel || Arch == Triple::mips)
- return 16;
- else if (Arch == Triple::ppc64)
- return 44;
- else
- return 0;
- }
+ bool IsTargetLittleEndian;
+
+ // True if all sections should be passed to the memory manager, false if only
+ // sections containing relocations should be. Defaults to 'false'.
+ bool ProcessAllSections;
+
+ // This mutex prevents simultaneously loading objects from two different
+ // threads. This keeps us from having to protect individual data structures
+ // and guarantees that section allocation requests to the memory manager
+ // won't be interleaved between modules. It is also used in mapSectionAddress
+ // and resolveRelocations to protect write access to internal data structures.
+ //
+ // loadObject may be called on the same thread during the handling of of
+ // processRelocations, and that's OK. The handling of the relocation lists
+ // is written in such a way as to work correctly if new elements are added to
+ // the end of the list while the list is being processed.
+ sys::Mutex lock;
+
+ virtual unsigned getMaxStubSize() = 0;
+ virtual unsigned getStubAlignment() = 0;
bool HasError;
std::string ErrorStr;
}
uint8_t *getSectionAddress(unsigned SectionID) {
- return (uint8_t*)Sections[SectionID].Address;
- }
-
- // Subclasses can override this method to get the alignment requirement of
- // a common symbol. Returns no alignment requirement if not implemented.
- virtual unsigned getCommonSymbolAlignment(const SymbolRef &Sym) {
- return 0;
+ return (uint8_t *)Sections[SectionID].Address;
}
-
void writeInt16BE(uint8_t *Addr, uint16_t Value) {
- if (sys::isLittleEndianHost())
+ if (IsTargetLittleEndian)
Value = sys::SwapByteOrder(Value);
- *Addr = (Value >> 8) & 0xFF;
- *(Addr+1) = Value & 0xFF;
+ *Addr = (Value >> 8) & 0xFF;
+ *(Addr + 1) = Value & 0xFF;
}
void writeInt32BE(uint8_t *Addr, uint32_t Value) {
- if (sys::isLittleEndianHost())
+ if (IsTargetLittleEndian)
Value = sys::SwapByteOrder(Value);
- *Addr = (Value >> 24) & 0xFF;
- *(Addr+1) = (Value >> 16) & 0xFF;
- *(Addr+2) = (Value >> 8) & 0xFF;
- *(Addr+3) = Value & 0xFF;
+ *Addr = (Value >> 24) & 0xFF;
+ *(Addr + 1) = (Value >> 16) & 0xFF;
+ *(Addr + 2) = (Value >> 8) & 0xFF;
+ *(Addr + 3) = Value & 0xFF;
}
void writeInt64BE(uint8_t *Addr, uint64_t Value) {
- if (sys::isLittleEndianHost())
+ if (IsTargetLittleEndian)
Value = sys::SwapByteOrder(Value);
- *Addr = (Value >> 56) & 0xFF;
- *(Addr+1) = (Value >> 48) & 0xFF;
- *(Addr+2) = (Value >> 40) & 0xFF;
- *(Addr+3) = (Value >> 32) & 0xFF;
- *(Addr+4) = (Value >> 24) & 0xFF;
- *(Addr+5) = (Value >> 16) & 0xFF;
- *(Addr+6) = (Value >> 8) & 0xFF;
- *(Addr+7) = Value & 0xFF;
+ *Addr = (Value >> 56) & 0xFF;
+ *(Addr + 1) = (Value >> 48) & 0xFF;
+ *(Addr + 2) = (Value >> 40) & 0xFF;
+ *(Addr + 3) = (Value >> 32) & 0xFF;
+ *(Addr + 4) = (Value >> 24) & 0xFF;
+ *(Addr + 5) = (Value >> 16) & 0xFF;
+ *(Addr + 6) = (Value >> 8) & 0xFF;
+ *(Addr + 7) = Value & 0xFF;
}
/// \brief Given the common symbols discovered in the object file, emit a
/// new section for them and update the symbol mappings in the object and
/// symbol table.
- void emitCommonSymbols(ObjectImage &Obj,
- const CommonSymbolMap &CommonSymbols,
- uint64_t TotalSize,
- SymbolTableMap &SymbolTable);
+ void emitCommonSymbols(ObjectImage &Obj, const CommonSymbolMap &CommonSymbols,
+ uint64_t TotalSize, SymbolTableMap &SymbolTable);
/// \brief Emits section data from the object file to the MemoryManager.
/// \param IsCode if it's true then allocateCodeSection() will be
/// used for emits, else allocateDataSection() will be used.
/// \return SectionID.
- unsigned emitSection(ObjectImage &Obj,
- const SectionRef &Section,
+ unsigned emitSection(ObjectImage &Obj, const SectionRef &Section,
bool IsCode);
/// \brief Find Section in LocalSections. If the secton is not found - emit
/// \param IsCode if it's true then allocateCodeSection() will be
/// used for emmits, else allocateDataSection() will be used.
/// \return SectionID.
- unsigned findOrEmitSection(ObjectImage &Obj,
- const SectionRef &Section,
- bool IsCode,
- ObjSectionToIDMap &LocalSections);
+ unsigned findOrEmitSection(ObjectImage &Obj, const SectionRef &Section,
+ bool IsCode, ObjSectionToIDMap &LocalSections);
// \brief Add a relocation entry that uses the given section.
void addRelocationForSection(const RelocationEntry &RE, unsigned SectionID);
/// \brief Emits long jump instruction to Addr.
/// \return Pointer to the memory area for emitting target address.
- uint8_t* createStubFunction(uint8_t *Addr);
+ uint8_t *createStubFunction(uint8_t *Addr);
/// \brief Resolves relocations from Relocs list with address from Value.
void resolveRelocationList(const RelocationList &Relocs, uint64_t Value);
- void resolveRelocationEntry(const RelocationEntry &RE, uint64_t Value);
/// \brief A object file specific relocation resolver
- /// \param Section The section where the relocation is being applied
- /// \param Offset The offset into the section for this relocation
+ /// \param RE The relocation to be resolved
/// \param Value Target symbol address to apply the relocation action
- /// \param Type object file specific relocation type
- /// \param Addend A constant addend used to compute the value to be stored
- /// into the relocatable field
- virtual void resolveRelocation(const SectionEntry &Section,
- uint64_t Offset,
- uint64_t Value,
- uint32_t Type,
- int64_t Addend) = 0;
-
- /// \brief Parses the object file relocation and stores it to Relocations
- /// or SymbolRelocations (this depends on the object file type).
- virtual void processRelocationRef(const ObjRelocationInfo &Rel,
- ObjectImage &Obj,
- ObjSectionToIDMap &ObjSectionToID,
- const SymbolTableMap &Symbols,
- StubMap &Stubs) = 0;
+ virtual void resolveRelocation(const RelocationEntry &RE, uint64_t Value) = 0;
+
+ /// \brief Parses one or more object file relocations (some object files use
+ /// relocation pairs) and stores it to Relocations or SymbolRelocations
+ /// (this depends on the object file type).
+ /// \return Iterator to the next relocation that needs to be parsed.
+ virtual relocation_iterator
+ processRelocationRef(unsigned SectionID, relocation_iterator RelI,
+ ObjectImage &Obj, ObjSectionToIDMap &ObjSectionToID,
+ const SymbolTableMap &Symbols, StubMap &Stubs) = 0;
/// \brief Resolve relocations to external symbols.
void resolveExternalSymbols();
- virtual ObjectImage *createObjectImage(ObjectBuffer *InputBuffer);
+
+ /// \brief Update GOT entries for external symbols.
+ // The base class does nothing. ELF overrides this.
+ virtual void updateGOTEntries(StringRef Name, uint64_t Addr) {}
+
+ // \brief Compute an upper bound of the memory that is required to load all
+ // sections
+ void computeTotalAllocSize(ObjectImage &Obj, uint64_t &CodeSize,
+ uint64_t &DataSizeRO, uint64_t &DataSizeRW);
+
+ // \brief Compute the stub buffer size required for a section
+ unsigned computeSectionStubBufSize(ObjectImage &Obj,
+ const SectionRef &Section);
+
public:
- RuntimeDyldImpl(RTDyldMemoryManager *mm) : MemMgr(mm), HasError(false) {}
+ RuntimeDyldImpl(RTDyldMemoryManager *mm)
+ : MemMgr(mm), ProcessAllSections(false), HasError(false) {}
virtual ~RuntimeDyldImpl();
- ObjectImage *loadObject(ObjectBuffer *InputBuffer);
+ void setProcessAllSections(bool ProcessAllSections) {
+ this->ProcessAllSections = ProcessAllSections;
+ }
+
+ ObjectImage *loadObject(ObjectImage *InputObject);
void *getSymbolAddress(StringRef Name) {
// FIXME: Just look up as a function for now. Overly simple of course.
// Work in progress.
- if (GlobalSymbolTable.find(Name) == GlobalSymbolTable.end())
- return 0;
- SymbolLoc Loc = GlobalSymbolTable.lookup(Name);
+ SymbolTableMap::const_iterator pos = GlobalSymbolTable.find(Name);
+ if (pos == GlobalSymbolTable.end())
+ return nullptr;
+ SymbolLoc Loc = pos->second;
return getSectionAddress(Loc.first) + Loc.second;
}
uint64_t getSymbolLoadAddress(StringRef Name) {
// FIXME: Just look up as a function for now. Overly simple of course.
// Work in progress.
- if (GlobalSymbolTable.find(Name) == GlobalSymbolTable.end())
+ SymbolTableMap::const_iterator pos = GlobalSymbolTable.find(Name);
+ if (pos == GlobalSymbolTable.end())
return 0;
- SymbolLoc Loc = GlobalSymbolTable.lookup(Name);
+ SymbolLoc Loc = pos->second;
return getSectionLoadAddress(Loc.first) + Loc.second;
}
StringRef getErrorString() { return ErrorStr; }
virtual bool isCompatibleFormat(const ObjectBuffer *Buffer) const = 0;
+ virtual bool isCompatibleFile(const ObjectFile *Obj) const = 0;
+
+ virtual void registerEHFrames();
+
+ virtual void deregisterEHFrames();
+
+ virtual void finalizeLoad(ObjSectionToIDMap &SectionMap) {}
};
} // end namespace llvm
-
#endif