#define LLVM_OBJECT_RELOCVISITOR_H
#include "llvm/ADT/StringRef.h"
+#include "llvm/Object/COFF.h"
#include "llvm/Object/ELFObjectFile.h"
+#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ELF.h"
+#include "llvm/Support/MachO.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
/// @brief Base class for object file relocation visitors.
class RelocVisitor {
public:
- explicit RelocVisitor(ObjectFile &Obj)
+ explicit RelocVisitor(const ObjectFile &Obj)
: ObjToVisit(Obj), HasError(false) {}
// TODO: Should handle multiple applied relocations via either passing in the
// previously computed value or just count paired relocations as a single
// visit.
- RelocToApply visit(uint32_t RelocType, RelocationRef R, uint64_t SecAddr = 0,
- uint64_t Value = 0) {
+ RelocToApply visit(uint32_t RelocType, RelocationRef R, uint64_t Value = 0) {
+ if (isa<ELFObjectFileBase>(ObjToVisit))
+ return visitELF(RelocType, R, Value);
+ if (isa<COFFObjectFile>(ObjToVisit))
+ return visitCOFF(RelocType, R, Value);
+ if (isa<MachOObjectFile>(ObjToVisit))
+ return visitMachO(RelocType, R, Value);
+
+ HasError = true;
+ return RelocToApply();
+ }
+
+ bool error() { return HasError; }
+
+private:
+ const ObjectFile &ObjToVisit;
+ bool HasError;
+
+ RelocToApply visitELF(uint32_t RelocType, RelocationRef R, uint64_t Value) {
if (ObjToVisit.getBytesInAddress() == 8) { // 64-bit object file
switch (ObjToVisit.getArch()) {
case Triple::x86_64:
case llvm::ELF::R_X86_64_64:
return visitELF_X86_64_64(R, Value);
case llvm::ELF::R_X86_64_PC32:
- return visitELF_X86_64_PC32(R, Value, SecAddr);
+ return visitELF_X86_64_PC32(R, Value);
case llvm::ELF::R_X86_64_32:
return visitELF_X86_64_32(R, Value);
case llvm::ELF::R_X86_64_32S:
case llvm::ELF::R_386_32:
return visitELF_386_32(R, Value);
case llvm::ELF::R_386_PC32:
- return visitELF_386_PC32(R, Value, SecAddr);
+ return visitELF_386_PC32(R, Value);
default:
HasError = true;
return RelocToApply();
case llvm::ELF::R_ARM_ABS32:
return visitELF_ARM_ABS32(R, Value);
}
- case Triple::hexagon:
- llvm_unreachable("Unimplemented");
case Triple::mipsel:
case Triple::mips:
switch (RelocType) {
}
}
- bool error() { return HasError; }
-
-private:
- ObjectFile &ObjToVisit;
- bool HasError;
-
- int64_t getAddend32LE(RelocationRef R) {
- const ELF32LEObjectFile *Obj = cast<ELF32LEObjectFile>(R.getObjectFile());
- DataRefImpl DRI = R.getRawDataRefImpl();
- int64_t Addend;
- Obj->getRelocationAddend(DRI, Addend);
- return Addend;
+ RelocToApply visitCOFF(uint32_t RelocType, RelocationRef R, uint64_t Value) {
+ switch (ObjToVisit.getArch()) {
+ case Triple::x86:
+ switch (RelocType) {
+ case COFF::IMAGE_REL_I386_SECREL:
+ return visitCOFF_I386_SECREL(R, Value);
+ case COFF::IMAGE_REL_I386_DIR32:
+ return visitCOFF_I386_DIR32(R, Value);
+ }
+ break;
+ case Triple::x86_64:
+ switch (RelocType) {
+ case COFF::IMAGE_REL_AMD64_SECREL:
+ return visitCOFF_AMD64_SECREL(R, Value);
+ case COFF::IMAGE_REL_AMD64_ADDR64:
+ return visitCOFF_AMD64_ADDR64(R, Value);
+ }
+ break;
+ }
+ HasError = true;
+ return RelocToApply();
}
- int64_t getAddend64LE(RelocationRef R) {
- const ELF64LEObjectFile *Obj = cast<ELF64LEObjectFile>(R.getObjectFile());
- DataRefImpl DRI = R.getRawDataRefImpl();
- int64_t Addend;
- Obj->getRelocationAddend(DRI, Addend);
- return Addend;
+ RelocToApply visitMachO(uint32_t RelocType, RelocationRef R, uint64_t Value) {
+ switch (ObjToVisit.getArch()) {
+ default: break;
+ case Triple::x86_64:
+ switch (RelocType) {
+ default: break;
+ case MachO::X86_64_RELOC_UNSIGNED:
+ return visitMACHO_X86_64_UNSIGNED(R, Value);
+ }
+ }
+ HasError = true;
+ return RelocToApply();
}
- int64_t getAddend32BE(RelocationRef R) {
- const ELF32BEObjectFile *Obj = cast<ELF32BEObjectFile>(R.getObjectFile());
+ int64_t getELFAddend(RelocationRef R) {
+ const auto *Obj = cast<ELFObjectFileBase>(R.getObject());
DataRefImpl DRI = R.getRawDataRefImpl();
- int64_t Addend;
- Obj->getRelocationAddend(DRI, Addend);
- return Addend;
+ ErrorOr<int64_t> AddendOrErr = Obj->getRelocationAddend(DRI);
+ if (std::error_code EC = AddendOrErr.getError())
+ report_fatal_error(EC.message());
+ return *AddendOrErr;
}
- int64_t getAddend64BE(RelocationRef R) {
- const ELF64BEObjectFile *Obj = cast<ELF64BEObjectFile>(R.getObjectFile());
- DataRefImpl DRI = R.getRawDataRefImpl();
- int64_t Addend;
- Obj->getRelocationAddend(DRI, Addend);
- return Addend;
+ uint8_t getLengthMachO64(RelocationRef R) {
+ const MachOObjectFile *Obj = cast<MachOObjectFile>(R.getObject());
+ return Obj->getRelocationLength(R.getRawDataRefImpl());
}
+
/// Operations
/// 386-ELF
// Ideally the Addend here will be the addend in the data for
// the relocation. It's not actually the case for Rel relocations.
RelocToApply visitELF_386_32(RelocationRef R, uint64_t Value) {
- int64_t Addend = getAddend32LE(R);
- return RelocToApply(Value + Addend, 4);
+ return RelocToApply(Value, 4);
}
- RelocToApply visitELF_386_PC32(RelocationRef R, uint64_t Value,
- uint64_t SecAddr) {
- int64_t Addend = getAddend32LE(R);
+ RelocToApply visitELF_386_PC32(RelocationRef R, uint64_t Value) {
uint64_t Address;
R.getOffset(Address);
- return RelocToApply(Value + Addend - Address, 4);
+ return RelocToApply(Value - Address, 4);
}
/// X86-64 ELF
return RelocToApply(0, 0);
}
RelocToApply visitELF_X86_64_64(RelocationRef R, uint64_t Value) {
- int64_t Addend = getAddend64LE(R);
+ int64_t Addend = getELFAddend(R);
return RelocToApply(Value + Addend, 8);
}
- RelocToApply visitELF_X86_64_PC32(RelocationRef R, uint64_t Value,
- uint64_t SecAddr) {
- int64_t Addend = getAddend64LE(R);
+ RelocToApply visitELF_X86_64_PC32(RelocationRef R, uint64_t Value) {
+ int64_t Addend = getELFAddend(R);
uint64_t Address;
R.getOffset(Address);
return RelocToApply(Value + Addend - Address, 4);
}
RelocToApply visitELF_X86_64_32(RelocationRef R, uint64_t Value) {
- int64_t Addend = getAddend64LE(R);
+ int64_t Addend = getELFAddend(R);
uint32_t Res = (Value + Addend) & 0xFFFFFFFF;
return RelocToApply(Res, 4);
}
RelocToApply visitELF_X86_64_32S(RelocationRef R, uint64_t Value) {
- int64_t Addend = getAddend64LE(R);
+ int64_t Addend = getELFAddend(R);
int32_t Res = (Value + Addend) & 0xFFFFFFFF;
return RelocToApply(Res, 4);
}
/// PPC64 ELF
RelocToApply visitELF_PPC64_ADDR32(RelocationRef R, uint64_t Value) {
- int64_t Addend;
- getELFRelocationAddend(R, Addend);
+ int64_t Addend = getELFAddend(R);
uint32_t Res = (Value + Addend) & 0xFFFFFFFF;
return RelocToApply(Res, 4);
}
RelocToApply visitELF_PPC64_ADDR64(RelocationRef R, uint64_t Value) {
- int64_t Addend;
- getELFRelocationAddend(R, Addend);
+ int64_t Addend = getELFAddend(R);
return RelocToApply(Value + Addend, 8);
}
/// PPC32 ELF
RelocToApply visitELF_PPC_ADDR32(RelocationRef R, uint64_t Value) {
- int64_t Addend = getAddend32BE(R);
+ int64_t Addend = getELFAddend(R);
uint32_t Res = (Value + Addend) & 0xFFFFFFFF;
return RelocToApply(Res, 4);
}
/// MIPS ELF
RelocToApply visitELF_MIPS_32(RelocationRef R, uint64_t Value) {
- int64_t Addend;
- getELFRelocationAddend(R, Addend);
- uint32_t Res = (Value + Addend) & 0xFFFFFFFF;
+ uint32_t Res = (Value)&0xFFFFFFFF;
return RelocToApply(Res, 4);
}
RelocToApply visitELF_MIPS_64(RelocationRef R, uint64_t Value) {
- int64_t Addend;
- getELFRelocationAddend(R, Addend);
+ int64_t Addend = getELFAddend(R);
uint64_t Res = (Value + Addend);
return RelocToApply(Res, 8);
}
// AArch64 ELF
RelocToApply visitELF_AARCH64_ABS32(RelocationRef R, uint64_t Value) {
- int64_t Addend = getAddend64LE(R);
+ int64_t Addend = getELFAddend(R);
int64_t Res = Value + Addend;
// Overflow check allows for both signed and unsigned interpretation.
}
RelocToApply visitELF_AARCH64_ABS64(RelocationRef R, uint64_t Value) {
- int64_t Addend = getAddend64LE(R);
+ int64_t Addend = getELFAddend(R);
return RelocToApply(Value + Addend, 8);
}
// SystemZ ELF
RelocToApply visitELF_390_32(RelocationRef R, uint64_t Value) {
- int64_t Addend = getAddend64BE(R);
+ int64_t Addend = getELFAddend(R);
int64_t Res = Value + Addend;
// Overflow check allows for both signed and unsigned interpretation.
}
RelocToApply visitELF_390_64(RelocationRef R, uint64_t Value) {
- int64_t Addend = getAddend64BE(R);
+ int64_t Addend = getELFAddend(R);
return RelocToApply(Value + Addend, 8);
}
RelocToApply visitELF_SPARC_32(RelocationRef R, uint32_t Value) {
- int32_t Addend = getAddend32BE(R);
+ int32_t Addend = getELFAddend(R);
return RelocToApply(Value + Addend, 4);
}
RelocToApply visitELF_SPARCV9_32(RelocationRef R, uint64_t Value) {
- int32_t Addend = getAddend64BE(R);
+ int32_t Addend = getELFAddend(R);
return RelocToApply(Value + Addend, 4);
}
RelocToApply visitELF_SPARCV9_64(RelocationRef R, uint64_t Value) {
- int64_t Addend = getAddend64BE(R);
+ int64_t Addend = getELFAddend(R);
return RelocToApply(Value + Addend, 8);
}
RelocToApply visitELF_ARM_ABS32(RelocationRef R, uint64_t Value) {
- int64_t Addend = getAddend32LE(R);
- return RelocToApply(Value + Addend, 4);
+ int64_t Res = Value;
+
+ // Overflow check allows for both signed and unsigned interpretation.
+ if (Res < INT32_MIN || Res > UINT32_MAX)
+ HasError = true;
+
+ return RelocToApply(static_cast<uint32_t>(Res), 4);
+ }
+
+ /// I386 COFF
+ RelocToApply visitCOFF_I386_SECREL(RelocationRef R, uint64_t Value) {
+ return RelocToApply(static_cast<uint32_t>(Value), /*Width=*/4);
+ }
+
+ RelocToApply visitCOFF_I386_DIR32(RelocationRef R, uint64_t Value) {
+ return RelocToApply(static_cast<uint32_t>(Value), /*Width=*/4);
}
+ /// AMD64 COFF
+ RelocToApply visitCOFF_AMD64_SECREL(RelocationRef R, uint64_t Value) {
+ return RelocToApply(static_cast<uint32_t>(Value), /*Width=*/4);
+ }
+
+ RelocToApply visitCOFF_AMD64_ADDR64(RelocationRef R, uint64_t Value) {
+ return RelocToApply(Value, /*Width=*/8);
+ }
+
+ // X86_64 MachO
+ RelocToApply visitMACHO_X86_64_UNSIGNED(RelocationRef R, uint64_t Value) {
+ uint8_t Length = getLengthMachO64(R);
+ Length = 1<<Length;
+ return RelocToApply(Value, Length);
+ }
};
}
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