namespace llvm {
+StringRef RuntimeDyldELF::getEHFrameSection() {
+ for (int i = 0, e = Sections.size(); i != e; ++i) {
+ if (Sections[i].Name == ".eh_frame")
+ return StringRef((const char*)Sections[i].Address, Sections[i].Size);
+ }
+ return StringRef();
+}
+
ObjectImage *RuntimeDyldELF::createObjectImage(ObjectBuffer *Buffer) {
if (Buffer->getBufferSize() < ELF::EI_NIDENT)
llvm_unreachable("Unexpected ELF object size");
}
}
+void RuntimeDyldELF::resolveAArch64Relocation(const SectionEntry &Section,
+ uint64_t Offset,
+ uint64_t Value,
+ uint32_t Type,
+ int64_t Addend) {
+ uint32_t *TargetPtr = reinterpret_cast<uint32_t*>(Section.Address + Offset);
+ uint64_t FinalAddress = Section.LoadAddress + Offset;
+
+ DEBUG(dbgs() << "resolveAArch64Relocation, LocalAddress: 0x"
+ << format("%llx", Section.Address + Offset)
+ << " FinalAddress: 0x" << format("%llx",FinalAddress)
+ << " Value: 0x" << format("%llx",Value)
+ << " Type: 0x" << format("%x",Type)
+ << " Addend: 0x" << format("%llx",Addend)
+ << "\n");
+
+ switch (Type) {
+ default:
+ llvm_unreachable("Relocation type not implemented yet!");
+ break;
+ case ELF::R_AARCH64_ABS64: {
+ uint64_t *TargetPtr = reinterpret_cast<uint64_t*>(Section.Address + Offset);
+ *TargetPtr = Value + Addend;
+ break;
+ }
+ case ELF::R_AARCH64_PREL32: {
+ uint64_t Result = Value + Addend - FinalAddress;
+ assert(static_cast<int64_t>(Result) >= INT32_MIN &&
+ static_cast<int64_t>(Result) <= UINT32_MAX);
+ *TargetPtr = static_cast<uint32_t>(Result & 0xffffffffU);
+ break;
+ }
+ case ELF::R_AARCH64_CALL26: // fallthrough
+ case ELF::R_AARCH64_JUMP26: {
+ // Operation: S+A-P. Set Call or B immediate value to bits fff_fffc of the
+ // calculation.
+ uint64_t BranchImm = Value + Addend - FinalAddress;
+
+ // "Check that -2^27 <= result < 2^27".
+ assert(-(1LL << 27) <= static_cast<int64_t>(BranchImm) &&
+ static_cast<int64_t>(BranchImm) < (1LL << 27));
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xfc000000U;
+ // Immediate goes in bits 25:0 of B and BL.
+ *TargetPtr |= static_cast<uint32_t>(BranchImm & 0xffffffcU) >> 2;
+ break;
+ }
+ case ELF::R_AARCH64_MOVW_UABS_G3: {
+ uint64_t Result = Value + Addend;
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xffe0001fU;
+ // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
+ *TargetPtr |= Result >> (48 - 5);
+ // Shift must be "lsl #48", in bits 22:21
+ assert((*TargetPtr >> 21 & 0x3) == 3 && "invalid shift for relocation");
+ break;
+ }
+ case ELF::R_AARCH64_MOVW_UABS_G2_NC: {
+ uint64_t Result = Value + Addend;
+
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xffe0001fU;
+ // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
+ *TargetPtr |= ((Result & 0xffff00000000ULL) >> (32 - 5));
+ // Shift must be "lsl #32", in bits 22:21
+ assert((*TargetPtr >> 21 & 0x3) == 2 && "invalid shift for relocation");
+ break;
+ }
+ case ELF::R_AARCH64_MOVW_UABS_G1_NC: {
+ uint64_t Result = Value + Addend;
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xffe0001fU;
+ // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
+ *TargetPtr |= ((Result & 0xffff0000U) >> (16 - 5));
+ // Shift must be "lsl #16", in bits 22:2
+ assert((*TargetPtr >> 21 & 0x3) == 1 && "invalid shift for relocation");
+ break;
+ }
+ case ELF::R_AARCH64_MOVW_UABS_G0_NC: {
+ uint64_t Result = Value + Addend;
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xffe0001fU;
+ // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
+ *TargetPtr |= ((Result & 0xffffU) << 5);
+ // Shift must be "lsl #0", in bits 22:21.
+ assert((*TargetPtr >> 21 & 0x3) == 0 && "invalid shift for relocation");
+ break;
+ }
+ }
+}
+
void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section,
uint64_t Offset,
uint32_t Value,
uint32_t Type,
int32_t Addend) {
// TODO: Add Thumb relocations.
+ uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress +
+ Offset);
uint32_t* TargetPtr = (uint32_t*)(Section.Address + Offset);
uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF);
Value += Addend;
// Write a 32bit value to relocation address, taking into account the
// implicit addend encoded in the target.
- case ELF::R_ARM_TARGET1 :
- case ELF::R_ARM_ABS32 :
- *TargetPtr += Value;
+ case ELF::R_ARM_TARGET1:
+ case ELF::R_ARM_ABS32:
+ *TargetPtr = *Placeholder + 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 :
+ case ELF::R_ARM_MOVW_ABS_NC:
// We are not expecting any other addend in the relocation address.
// Using 0x000F0FFF because MOVW has its 16 bit immediate split into 2
// non-contiguous fields.
- assert((*TargetPtr & 0x000F0FFF) == 0);
+ assert((*Placeholder & 0x000F0FFF) == 0);
Value = Value & 0xFFFF;
- *TargetPtr |= Value & 0xFFF;
+ *TargetPtr = *Placeholder | (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 :
+ case ELF::R_ARM_MOVT_ABS:
// We are not expecting any other addend in the relocation address.
// Use 0x000F0FFF for the same reason as R_ARM_MOVW_ABS_NC.
- assert((*TargetPtr & 0x000F0FFF) == 0);
+ assert((*Placeholder & 0x000F0FFF) == 0);
+
Value = (Value >> 16) & 0xFFFF;
- *TargetPtr |= Value & 0xFFF;
+ *TargetPtr = *Placeholder | (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 :
+ case ELF::R_ARM_JUMP24: {
int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8);
RelValue = (RelValue & 0x03FFFFFC) >> 2;
+ assert((*TargetPtr & 0xFFFFFF) == 0xFFFFFE);
*TargetPtr &= 0xFF000000;
*TargetPtr |= RelValue;
break;
}
+ case ELF::R_ARM_PRIVATE_0:
+ // This relocation is reserved by the ARM ELF ABI for internal use. We
+ // appropriate it here to act as an R_ARM_ABS32 without any addend for use
+ // in the stubs created during JIT (which can't put an addend into the
+ // original object file).
+ *TargetPtr = Value;
+ break;
+ }
}
void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section,
uint32_t Value,
uint32_t Type,
int32_t Addend) {
+ uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress +
+ Offset);
uint32_t* TargetPtr = (uint32_t*)(Section.Address + Offset);
Value += Addend;
llvm_unreachable("Not implemented relocation type!");
break;
case ELF::R_MIPS_32:
- *TargetPtr = Value + (*TargetPtr);
+ *TargetPtr = Value + (*Placeholder);
break;
case ELF::R_MIPS_26:
- *TargetPtr = ((*TargetPtr) & 0xfc000000) | (( Value & 0x0fffffff) >> 2);
+ *TargetPtr = ((*Placeholder) & 0xfc000000) | (( Value & 0x0fffffff) >> 2);
break;
case ELF::R_MIPS_HI16:
// Get the higher 16-bits. Also add 1 if bit 15 is 1.
- Value += ((*TargetPtr) & 0x0000ffff) << 16;
+ Value += ((*Placeholder) & 0x0000ffff) << 16;
+ *TargetPtr = ((*Placeholder) & 0xffff0000) |
+ (((Value + 0x8000) >> 16) & 0xffff);
+ break;
+ case ELF::R_MIPS_LO16:
+ Value += ((*Placeholder) & 0x0000ffff);
+ *TargetPtr = ((*Placeholder) & 0xffff0000) | (Value & 0xffff);
+ break;
+ case ELF::R_MIPS_UNUSED1:
+ // Similar to ELF::R_ARM_PRIVATE_0, R_MIPS_UNUSED1 and R_MIPS_UNUSED2
+ // are used for internal JIT purpose. These relocations are similar to
+ // R_MIPS_HI16 and R_MIPS_LO16, but they do not take any addend into
+ // account.
*TargetPtr = ((*TargetPtr) & 0xffff0000) |
(((Value + 0x8000) >> 16) & 0xffff);
break;
- case ELF::R_MIPS_LO16:
- Value += ((*TargetPtr) & 0x0000ffff);
+ case ELF::R_MIPS_UNUSED2:
*TargetPtr = ((*TargetPtr) & 0xffff0000) | (Value & 0xffff);
break;
}
error_code err;
for (section_iterator si = Obj.begin_sections(),
se = Obj.end_sections(); si != se; si.increment(err)) {
- StringRef SectionName;
- check(si->getName(SectionName));
- if (SectionName != ".opd")
+ section_iterator RelSecI = si->getRelocatedSection();
+ if (RelSecI == Obj.end_sections())
+ continue;
+
+ StringRef RelSectionName;
+ check(RelSecI->getName(RelSectionName));
+ if (RelSectionName != ".opd")
continue;
for (relocation_iterator i = si->begin_relocations(),
continue;
}
- SymbolRef TargetSymbol;
uint64_t TargetSymbolOffset;
- int64_t TargetAdditionalInfo;
- check(i->getSymbol(TargetSymbol));
+ symbol_iterator TargetSymbol = i->getSymbol();
check(i->getOffset(TargetSymbolOffset));
- check(i->getAdditionalInfo(TargetAdditionalInfo));
+ int64_t Addend;
+ check(getELFRelocationAddend(*i, Addend));
i = i.increment(err);
if (i == e)
continue;
section_iterator tsi(Obj.end_sections());
- check(TargetSymbol.getSection(tsi));
+ check(TargetSymbol->getSection(tsi));
Rel.SectionID = findOrEmitSection(Obj, (*tsi), true, LocalSections);
- Rel.Addend = (intptr_t)TargetAdditionalInfo;
+ Rel.Addend = (intptr_t)Addend;
return;
}
}
llvm_unreachable("Relocation R_PPC64_REL32 overflow");
writeInt32BE(LocalAddress, delta);
} break;
+ case ELF::R_PPC64_REL64: {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
+ uint64_t Delta = Value - FinalAddress + Addend;
+ writeInt64BE(LocalAddress, Delta);
+ } break;
case ELF::R_PPC64_ADDR64 :
writeInt64BE(LocalAddress, Value + Addend);
break;
}
}
+void RuntimeDyldELF::resolveSystemZRelocation(const SectionEntry &Section,
+ uint64_t Offset,
+ uint64_t Value,
+ uint32_t Type,
+ int64_t Addend) {
+ uint8_t *LocalAddress = Section.Address + Offset;
+ switch (Type) {
+ default:
+ llvm_unreachable("Relocation type not implemented yet!");
+ break;
+ case ELF::R_390_PC16DBL:
+ case ELF::R_390_PLT16DBL: {
+ int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset);
+ assert(int16_t(Delta / 2) * 2 == Delta && "R_390_PC16DBL overflow");
+ writeInt16BE(LocalAddress, Delta / 2);
+ break;
+ }
+ case ELF::R_390_PC32DBL:
+ case ELF::R_390_PLT32DBL: {
+ int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset);
+ assert(int32_t(Delta / 2) * 2 == Delta && "R_390_PC32DBL overflow");
+ writeInt32BE(LocalAddress, Delta / 2);
+ break;
+ }
+ case ELF::R_390_PC32: {
+ int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset);
+ assert(int32_t(Delta) == Delta && "R_390_PC32 overflow");
+ writeInt32BE(LocalAddress, Delta);
+ break;
+ }
+ case ELF::R_390_64:
+ writeInt64BE(LocalAddress, Value + Addend);
+ break;
+ }
+}
+
void RuntimeDyldELF::resolveRelocation(const RelocationEntry &RE,
uint64_t Value) {
const SectionEntry &Section = Sections[RE.SectionID];
(uint32_t)(Value & 0xffffffffL), Type,
(uint32_t)(Addend & 0xffffffffL));
break;
+ case Triple::aarch64:
+ resolveAArch64Relocation(Section, Offset, Value, Type, Addend);
+ break;
case Triple::arm: // Fall through.
case Triple::thumb:
resolveARMRelocation(Section, Offset,
case Triple::ppc64:
resolvePPC64Relocation(Section, Offset, Value, Type, Addend);
break;
+ case Triple::systemz:
+ resolveSystemZRelocation(Section, Offset, Value, Type, Addend);
+ break;
default: llvm_unreachable("Unsupported CPU type!");
}
}
uint64_t RelType;
Check(RelI.getType(RelType));
int64_t Addend;
- Check(RelI.getAdditionalInfo(Addend));
- SymbolRef Symbol;
- Check(RelI.getSymbol(Symbol));
+ Check(getELFRelocationAddend(RelI, Addend));
+ symbol_iterator Symbol = RelI.getSymbol();
// Obtain the symbol name which is referenced in the relocation
StringRef TargetName;
- Symbol.getName(TargetName);
+ if (Symbol != Obj.end_symbols())
+ Symbol->getName(TargetName);
DEBUG(dbgs() << "\t\tRelType: " << RelType
<< " Addend: " << Addend
<< " TargetName: " << TargetName
<< "\n");
RelocationValueRef Value;
// First search for the symbol in the local symbol table
- SymbolTableMap::const_iterator lsi = Symbols.find(TargetName.data());
- SymbolRef::Type SymType;
- Symbol.getType(SymType);
+ SymbolTableMap::const_iterator lsi = Symbols.end();
+ SymbolRef::Type SymType = SymbolRef::ST_Unknown;
+ if (Symbol != Obj.end_symbols()) {
+ lsi = Symbols.find(TargetName.data());
+ Symbol->getType(SymType);
+ }
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());
+ SymbolTableMap::const_iterator gsi = GlobalSymbolTable.end();
+ if (Symbol != Obj.end_symbols())
+ gsi = GlobalSymbolTable.find(TargetName.data());
if (gsi != GlobalSymbolTable.end()) {
Value.SectionID = gsi->second.first;
Value.Addend = gsi->second.second + Addend;
// 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);
+ 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");
DEBUG(dbgs() << "\t\tSectionID: " << SectionID
<< " Offset: " << Offset
<< "\n");
- if (Arch == Triple::arm &&
+ if (Arch == Triple::aarch64 &&
+ (RelType == ELF::R_AARCH64_CALL26 ||
+ RelType == ELF::R_AARCH64_JUMP26)) {
+ // This is an AArch64 branch relocation, need to use a stub function.
+ DEBUG(dbgs() << "\t\tThis is an AArch64 branch relocation.");
+ SectionEntry &Section = Sections[SectionID];
+
+ // Look for an existing stub.
+ StubMap::const_iterator i = Stubs.find(Value);
+ if (i != Stubs.end()) {
+ resolveRelocation(Section, Offset,
+ (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);
+
+ RelocationEntry REmovz_g3(SectionID,
+ StubTargetAddr - Section.Address,
+ ELF::R_AARCH64_MOVW_UABS_G3, Value.Addend);
+ RelocationEntry REmovk_g2(SectionID,
+ StubTargetAddr - Section.Address + 4,
+ ELF::R_AARCH64_MOVW_UABS_G2_NC, Value.Addend);
+ RelocationEntry REmovk_g1(SectionID,
+ StubTargetAddr - Section.Address + 8,
+ ELF::R_AARCH64_MOVW_UABS_G1_NC, Value.Addend);
+ RelocationEntry REmovk_g0(SectionID,
+ StubTargetAddr - Section.Address + 12,
+ ELF::R_AARCH64_MOVW_UABS_G0_NC, Value.Addend);
+
+ if (Value.SymbolName) {
+ addRelocationForSymbol(REmovz_g3, Value.SymbolName);
+ addRelocationForSymbol(REmovk_g2, Value.SymbolName);
+ addRelocationForSymbol(REmovk_g1, Value.SymbolName);
+ addRelocationForSymbol(REmovk_g0, Value.SymbolName);
+ } else {
+ addRelocationForSection(REmovz_g3, Value.SectionID);
+ addRelocationForSection(REmovk_g2, Value.SectionID);
+ addRelocationForSection(REmovk_g1, Value.SectionID);
+ addRelocationForSection(REmovk_g0, Value.SectionID);
+ }
+ resolveRelocation(Section, Offset,
+ (uint64_t)Section.Address + Section.StubOffset,
+ RelType, 0);
+ Section.StubOffset += getMaxStubSize();
+ }
+ } else if (Arch == Triple::arm &&
(RelType == ELF::R_ARM_PC24 ||
RelType == ELF::R_ARM_CALL ||
RelType == ELF::R_ARM_JUMP24)) {
uint8_t *StubTargetAddr = createStubFunction(Section.Address +
Section.StubOffset);
RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
- ELF::R_ARM_ABS32, Value.Addend);
+ ELF::R_ARM_PRIVATE_0, Value.Addend);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
// Creating Hi and Lo relocations for the filled stub instructions.
RelocationEntry REHi(SectionID,
StubTargetAddr - Section.Address,
- ELF::R_MIPS_HI16, Value.Addend);
+ ELF::R_MIPS_UNUSED1, Value.Addend);
RelocationEntry RELo(SectionID,
StubTargetAddr - Section.Address + 4,
- ELF::R_MIPS_LO16, Value.Addend);
+ ELF::R_MIPS_UNUSED2, Value.Addend);
if (Value.SymbolName) {
addRelocationForSymbol(REHi, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);
}
+ } else if (Arch == Triple::systemz &&
+ (RelType == ELF::R_390_PLT32DBL ||
+ RelType == ELF::R_390_GOTENT)) {
+ // Create function stubs for both PLT and GOT references, regardless of
+ // whether the GOT reference is to data or code. The stub contains the
+ // full address of the symbol, as needed by GOT references, and the
+ // executable part only adds an overhead of 8 bytes.
+ //
+ // We could try to conserve space by allocating the code and data
+ // parts of the stub separately. However, as things stand, we allocate
+ // a stub for every relocation, so using a GOT in JIT code should be
+ // no less space efficient than using an explicit constant pool.
+ DEBUG(dbgs() << "\t\tThis is a SystemZ indirect relocation.");
+ SectionEntry &Section = Sections[SectionID];
+
+ // Look for an existing stub.
+ StubMap::const_iterator i = Stubs.find(Value);
+ uintptr_t StubAddress;
+ if (i != Stubs.end()) {
+ StubAddress = uintptr_t(Section.Address) + i->second;
+ DEBUG(dbgs() << " Stub function found\n");
+ } else {
+ // Create a new stub function.
+ DEBUG(dbgs() << " Create a new stub function\n");
+
+ uintptr_t BaseAddress = uintptr_t(Section.Address);
+ uintptr_t StubAlignment = getStubAlignment();
+ StubAddress = (BaseAddress + Section.StubOffset +
+ StubAlignment - 1) & -StubAlignment;
+ unsigned StubOffset = StubAddress - BaseAddress;
+
+ Stubs[Value] = StubOffset;
+ createStubFunction((uint8_t *)StubAddress);
+ RelocationEntry RE(SectionID, StubOffset + 8,
+ ELF::R_390_64, Value.Addend - Addend);
+ if (Value.SymbolName)
+ addRelocationForSymbol(RE, Value.SymbolName);
+ else
+ addRelocationForSection(RE, Value.SectionID);
+ Section.StubOffset = StubOffset + getMaxStubSize();
+ }
+
+ if (RelType == ELF::R_390_GOTENT)
+ resolveRelocation(Section, Offset, StubAddress + 8,
+ ELF::R_390_PC32DBL, Addend);
+ else
+ resolveRelocation(Section, Offset, StubAddress, RelType, Addend);
} else {
RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
if (Value.SymbolName)
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