1 //===-- RuntimeDyldELF.cpp - Run-time dynamic linker for MC-JIT -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Implementation of ELF support for the MC-JIT runtime dynamic linker.
12 //===----------------------------------------------------------------------===//
14 #include "RuntimeDyldELF.h"
15 #include "RuntimeDyldCheckerImpl.h"
16 #include "llvm/ADT/IntervalMap.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/StringRef.h"
19 #include "llvm/ADT/Triple.h"
20 #include "llvm/MC/MCStreamer.h"
21 #include "llvm/Object/ELFObjectFile.h"
22 #include "llvm/Object/ObjectFile.h"
23 #include "llvm/Support/ELF.h"
24 #include "llvm/Support/Endian.h"
25 #include "llvm/Support/MemoryBuffer.h"
26 #include "llvm/Support/TargetRegistry.h"
29 using namespace llvm::object;
31 #define DEBUG_TYPE "dyld"
33 static inline std::error_code check(std::error_code Err) {
35 report_fatal_error(Err.message());
42 template <class ELFT> class DyldELFObject : public ELFObjectFile<ELFT> {
43 LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
45 typedef Elf_Shdr_Impl<ELFT> Elf_Shdr;
46 typedef Elf_Sym_Impl<ELFT> Elf_Sym;
47 typedef Elf_Rel_Impl<ELFT, false> Elf_Rel;
48 typedef Elf_Rel_Impl<ELFT, true> Elf_Rela;
50 typedef Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
52 typedef typename ELFDataTypeTypedefHelper<ELFT>::value_type addr_type;
55 DyldELFObject(MemoryBufferRef Wrapper, std::error_code &ec);
57 void updateSectionAddress(const SectionRef &Sec, uint64_t Addr);
59 void updateSymbolAddress(const SymbolRef &SymRef, uint64_t Addr);
61 // Methods for type inquiry through isa, cast and dyn_cast
62 static inline bool classof(const Binary *v) {
63 return (isa<ELFObjectFile<ELFT>>(v) &&
64 classof(cast<ELFObjectFile<ELFT>>(v)));
66 static inline bool classof(const ELFObjectFile<ELFT> *v) {
67 return v->isDyldType();
73 // The MemoryBuffer passed into this constructor is just a wrapper around the
74 // actual memory. Ultimately, the Binary parent class will take ownership of
75 // this MemoryBuffer object but not the underlying memory.
77 DyldELFObject<ELFT>::DyldELFObject(MemoryBufferRef Wrapper, std::error_code &EC)
78 : ELFObjectFile<ELFT>(Wrapper, EC) {
79 this->isDyldELFObject = true;
83 void DyldELFObject<ELFT>::updateSectionAddress(const SectionRef &Sec,
85 DataRefImpl ShdrRef = Sec.getRawDataRefImpl();
87 const_cast<Elf_Shdr *>(reinterpret_cast<const Elf_Shdr *>(ShdrRef.p));
89 // This assumes the address passed in matches the target address bitness
90 // The template-based type cast handles everything else.
91 shdr->sh_addr = static_cast<addr_type>(Addr);
95 void DyldELFObject<ELFT>::updateSymbolAddress(const SymbolRef &SymRef,
98 Elf_Sym *sym = const_cast<Elf_Sym *>(
99 ELFObjectFile<ELFT>::getSymbol(SymRef.getRawDataRefImpl()));
101 // This assumes the address passed in matches the target address bitness
102 // The template-based type cast handles everything else.
103 sym->st_value = static_cast<addr_type>(Addr);
106 class LoadedELFObjectInfo final
107 : public RuntimeDyld::LoadedObjectInfoHelper<LoadedELFObjectInfo> {
109 LoadedELFObjectInfo(RuntimeDyldImpl &RTDyld, ObjSectionToIDMap ObjSecToIDMap)
110 : LoadedObjectInfoHelper(RTDyld, std::move(ObjSecToIDMap)) {}
112 OwningBinary<ObjectFile>
113 getObjectForDebug(const ObjectFile &Obj) const override;
116 template <typename ELFT>
117 std::unique_ptr<DyldELFObject<ELFT>>
118 createRTDyldELFObject(MemoryBufferRef Buffer,
119 const ObjectFile &SourceObject,
120 const LoadedELFObjectInfo &L,
121 std::error_code &ec) {
122 typedef typename ELFFile<ELFT>::Elf_Shdr Elf_Shdr;
123 typedef typename ELFDataTypeTypedefHelper<ELFT>::value_type addr_type;
125 std::unique_ptr<DyldELFObject<ELFT>> Obj =
126 llvm::make_unique<DyldELFObject<ELFT>>(Buffer, ec);
128 // Iterate over all sections in the object.
129 auto SI = SourceObject.section_begin();
130 for (const auto &Sec : Obj->sections()) {
131 StringRef SectionName;
132 Sec.getName(SectionName);
133 if (SectionName != "") {
134 DataRefImpl ShdrRef = Sec.getRawDataRefImpl();
135 Elf_Shdr *shdr = const_cast<Elf_Shdr *>(
136 reinterpret_cast<const Elf_Shdr *>(ShdrRef.p));
138 if (uint64_t SecLoadAddr = L.getSectionLoadAddress(*SI)) {
139 // This assumes that the address passed in matches the target address
140 // bitness. The template-based type cast handles everything else.
141 shdr->sh_addr = static_cast<addr_type>(SecLoadAddr);
150 OwningBinary<ObjectFile> createELFDebugObject(const ObjectFile &Obj,
151 const LoadedELFObjectInfo &L) {
152 assert(Obj.isELF() && "Not an ELF object file.");
154 std::unique_ptr<MemoryBuffer> Buffer =
155 MemoryBuffer::getMemBufferCopy(Obj.getData(), Obj.getFileName());
159 std::unique_ptr<ObjectFile> DebugObj;
160 if (Obj.getBytesInAddress() == 4 && Obj.isLittleEndian()) {
161 typedef ELFType<support::little, false> ELF32LE;
162 DebugObj = createRTDyldELFObject<ELF32LE>(Buffer->getMemBufferRef(), Obj, L,
164 } else if (Obj.getBytesInAddress() == 4 && !Obj.isLittleEndian()) {
165 typedef ELFType<support::big, false> ELF32BE;
166 DebugObj = createRTDyldELFObject<ELF32BE>(Buffer->getMemBufferRef(), Obj, L,
168 } else if (Obj.getBytesInAddress() == 8 && !Obj.isLittleEndian()) {
169 typedef ELFType<support::big, true> ELF64BE;
170 DebugObj = createRTDyldELFObject<ELF64BE>(Buffer->getMemBufferRef(), Obj, L,
172 } else if (Obj.getBytesInAddress() == 8 && Obj.isLittleEndian()) {
173 typedef ELFType<support::little, true> ELF64LE;
174 DebugObj = createRTDyldELFObject<ELF64LE>(Buffer->getMemBufferRef(), Obj, L,
177 llvm_unreachable("Unexpected ELF format");
179 assert(!ec && "Could not construct copy ELF object file");
181 return OwningBinary<ObjectFile>(std::move(DebugObj), std::move(Buffer));
184 OwningBinary<ObjectFile>
185 LoadedELFObjectInfo::getObjectForDebug(const ObjectFile &Obj) const {
186 return createELFDebugObject(Obj, *this);
189 } // anonymous namespace
193 RuntimeDyldELF::RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr,
194 RuntimeDyld::SymbolResolver &Resolver)
195 : RuntimeDyldImpl(MemMgr, Resolver), GOTSectionID(0), CurrentGOTIndex(0) {}
196 RuntimeDyldELF::~RuntimeDyldELF() {}
198 void RuntimeDyldELF::registerEHFrames() {
199 for (int i = 0, e = UnregisteredEHFrameSections.size(); i != e; ++i) {
200 SID EHFrameSID = UnregisteredEHFrameSections[i];
201 uint8_t *EHFrameAddr = Sections[EHFrameSID].Address;
202 uint64_t EHFrameLoadAddr = Sections[EHFrameSID].LoadAddress;
203 size_t EHFrameSize = Sections[EHFrameSID].Size;
204 MemMgr.registerEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
205 RegisteredEHFrameSections.push_back(EHFrameSID);
207 UnregisteredEHFrameSections.clear();
210 void RuntimeDyldELF::deregisterEHFrames() {
211 for (int i = 0, e = RegisteredEHFrameSections.size(); i != e; ++i) {
212 SID EHFrameSID = RegisteredEHFrameSections[i];
213 uint8_t *EHFrameAddr = Sections[EHFrameSID].Address;
214 uint64_t EHFrameLoadAddr = Sections[EHFrameSID].LoadAddress;
215 size_t EHFrameSize = Sections[EHFrameSID].Size;
216 MemMgr.deregisterEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
218 RegisteredEHFrameSections.clear();
221 std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
222 RuntimeDyldELF::loadObject(const object::ObjectFile &O) {
223 return llvm::make_unique<LoadedELFObjectInfo>(*this, loadObjectImpl(O));
226 void RuntimeDyldELF::resolveX86_64Relocation(const SectionEntry &Section,
227 uint64_t Offset, uint64_t Value,
228 uint32_t Type, int64_t Addend,
229 uint64_t SymOffset) {
232 llvm_unreachable("Relocation type not implemented yet!");
234 case ELF::R_X86_64_64: {
235 support::ulittle64_t::ref(Section.Address + Offset) = Value + Addend;
236 DEBUG(dbgs() << "Writing " << format("%p", (Value + Addend)) << " at "
237 << format("%p\n", Section.Address + Offset));
240 case ELF::R_X86_64_32:
241 case ELF::R_X86_64_32S: {
243 assert((Type == ELF::R_X86_64_32 && (Value <= UINT32_MAX)) ||
244 (Type == ELF::R_X86_64_32S &&
245 ((int64_t)Value <= INT32_MAX && (int64_t)Value >= INT32_MIN)));
246 uint32_t TruncatedAddr = (Value & 0xFFFFFFFF);
247 support::ulittle32_t::ref(Section.Address + Offset) = TruncatedAddr;
248 DEBUG(dbgs() << "Writing " << format("%p", TruncatedAddr) << " at "
249 << format("%p\n", Section.Address + Offset));
252 case ELF::R_X86_64_PC32: {
253 uint64_t FinalAddress = Section.LoadAddress + Offset;
254 int64_t RealOffset = Value + Addend - FinalAddress;
255 assert(isInt<32>(RealOffset));
256 int32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
257 support::ulittle32_t::ref(Section.Address + Offset) = TruncOffset;
260 case ELF::R_X86_64_PC64: {
261 uint64_t FinalAddress = Section.LoadAddress + Offset;
262 int64_t RealOffset = Value + Addend - FinalAddress;
263 support::ulittle64_t::ref(Section.Address + Offset) = RealOffset;
269 void RuntimeDyldELF::resolveX86Relocation(const SectionEntry &Section,
270 uint64_t Offset, uint32_t Value,
271 uint32_t Type, int32_t Addend) {
273 case ELF::R_386_32: {
274 support::ulittle32_t::ref(Section.Address + Offset) = Value + Addend;
277 case ELF::R_386_PC32: {
278 uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF);
279 uint32_t RealOffset = Value + Addend - FinalAddress;
280 support::ulittle32_t::ref(Section.Address + Offset) = RealOffset;
284 // There are other relocation types, but it appears these are the
285 // only ones currently used by the LLVM ELF object writer
286 llvm_unreachable("Relocation type not implemented yet!");
291 void RuntimeDyldELF::resolveAArch64Relocation(const SectionEntry &Section,
292 uint64_t Offset, uint64_t Value,
293 uint32_t Type, int64_t Addend) {
294 uint32_t *TargetPtr = reinterpret_cast<uint32_t *>(Section.Address + Offset);
295 uint64_t FinalAddress = Section.LoadAddress + Offset;
297 DEBUG(dbgs() << "resolveAArch64Relocation, LocalAddress: 0x"
298 << format("%llx", Section.Address + Offset)
299 << " FinalAddress: 0x" << format("%llx", FinalAddress)
300 << " Value: 0x" << format("%llx", Value) << " Type: 0x"
301 << format("%x", Type) << " Addend: 0x" << format("%llx", Addend)
306 llvm_unreachable("Relocation type not implemented yet!");
308 case ELF::R_AARCH64_ABS64: {
309 uint64_t *TargetPtr =
310 reinterpret_cast<uint64_t *>(Section.Address + Offset);
311 *TargetPtr = Value + Addend;
314 case ELF::R_AARCH64_PREL32: {
315 uint64_t Result = Value + Addend - FinalAddress;
316 assert(static_cast<int64_t>(Result) >= INT32_MIN &&
317 static_cast<int64_t>(Result) <= UINT32_MAX);
318 *TargetPtr = static_cast<uint32_t>(Result & 0xffffffffU);
321 case ELF::R_AARCH64_CALL26: // fallthrough
322 case ELF::R_AARCH64_JUMP26: {
323 // Operation: S+A-P. Set Call or B immediate value to bits fff_fffc of the
325 uint64_t BranchImm = Value + Addend - FinalAddress;
327 // "Check that -2^27 <= result < 2^27".
328 assert(isInt<28>(BranchImm));
330 // AArch64 code is emitted with .rela relocations. The data already in any
331 // bits affected by the relocation on entry is garbage.
332 *TargetPtr &= 0xfc000000U;
333 // Immediate goes in bits 25:0 of B and BL.
334 *TargetPtr |= static_cast<uint32_t>(BranchImm & 0xffffffcU) >> 2;
337 case ELF::R_AARCH64_MOVW_UABS_G3: {
338 uint64_t Result = Value + Addend;
340 // AArch64 code is emitted with .rela relocations. The data already in any
341 // bits affected by the relocation on entry is garbage.
342 *TargetPtr &= 0xffe0001fU;
343 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
344 *TargetPtr |= Result >> (48 - 5);
345 // Shift must be "lsl #48", in bits 22:21
346 assert((*TargetPtr >> 21 & 0x3) == 3 && "invalid shift for relocation");
349 case ELF::R_AARCH64_MOVW_UABS_G2_NC: {
350 uint64_t Result = Value + Addend;
352 // AArch64 code is emitted with .rela relocations. The data already in any
353 // bits affected by the relocation on entry is garbage.
354 *TargetPtr &= 0xffe0001fU;
355 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
356 *TargetPtr |= ((Result & 0xffff00000000ULL) >> (32 - 5));
357 // Shift must be "lsl #32", in bits 22:21
358 assert((*TargetPtr >> 21 & 0x3) == 2 && "invalid shift for relocation");
361 case ELF::R_AARCH64_MOVW_UABS_G1_NC: {
362 uint64_t Result = Value + Addend;
364 // AArch64 code is emitted with .rela relocations. The data already in any
365 // bits affected by the relocation on entry is garbage.
366 *TargetPtr &= 0xffe0001fU;
367 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
368 *TargetPtr |= ((Result & 0xffff0000U) >> (16 - 5));
369 // Shift must be "lsl #16", in bits 22:2
370 assert((*TargetPtr >> 21 & 0x3) == 1 && "invalid shift for relocation");
373 case ELF::R_AARCH64_MOVW_UABS_G0_NC: {
374 uint64_t Result = Value + Addend;
376 // AArch64 code is emitted with .rela relocations. The data already in any
377 // bits affected by the relocation on entry is garbage.
378 *TargetPtr &= 0xffe0001fU;
379 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
380 *TargetPtr |= ((Result & 0xffffU) << 5);
381 // Shift must be "lsl #0", in bits 22:21.
382 assert((*TargetPtr >> 21 & 0x3) == 0 && "invalid shift for relocation");
385 case ELF::R_AARCH64_ADR_PREL_PG_HI21: {
386 // Operation: Page(S+A) - Page(P)
388 ((Value + Addend) & ~0xfffULL) - (FinalAddress & ~0xfffULL);
390 // Check that -2^32 <= X < 2^32
391 assert(isInt<33>(Result) && "overflow check failed for relocation");
393 // AArch64 code is emitted with .rela relocations. The data already in any
394 // bits affected by the relocation on entry is garbage.
395 *TargetPtr &= 0x9f00001fU;
396 // Immediate goes in bits 30:29 + 5:23 of ADRP instruction, taken
397 // from bits 32:12 of X.
398 *TargetPtr |= ((Result & 0x3000U) << (29 - 12));
399 *TargetPtr |= ((Result & 0x1ffffc000ULL) >> (14 - 5));
402 case ELF::R_AARCH64_LDST32_ABS_LO12_NC: {
404 uint64_t Result = Value + Addend;
406 // AArch64 code is emitted with .rela relocations. The data already in any
407 // bits affected by the relocation on entry is garbage.
408 *TargetPtr &= 0xffc003ffU;
409 // Immediate goes in bits 21:10 of LD/ST instruction, taken
410 // from bits 11:2 of X
411 *TargetPtr |= ((Result & 0xffc) << (10 - 2));
414 case ELF::R_AARCH64_LDST64_ABS_LO12_NC: {
416 uint64_t Result = Value + Addend;
418 // AArch64 code is emitted with .rela relocations. The data already in any
419 // bits affected by the relocation on entry is garbage.
420 *TargetPtr &= 0xffc003ffU;
421 // Immediate goes in bits 21:10 of LD/ST instruction, taken
422 // from bits 11:3 of X
423 *TargetPtr |= ((Result & 0xff8) << (10 - 3));
429 void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section,
430 uint64_t Offset, uint32_t Value,
431 uint32_t Type, int32_t Addend) {
432 // TODO: Add Thumb relocations.
433 uint32_t *TargetPtr = (uint32_t *)(Section.Address + Offset);
434 uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF);
437 DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: "
438 << Section.Address + Offset
439 << " FinalAddress: " << format("%p", FinalAddress) << " Value: "
440 << format("%x", Value) << " Type: " << format("%x", Type)
441 << " Addend: " << format("%x", Addend) << "\n");
445 llvm_unreachable("Not implemented relocation type!");
447 case ELF::R_ARM_NONE:
449 case ELF::R_ARM_PREL31:
450 case ELF::R_ARM_TARGET1:
451 case ELF::R_ARM_ABS32:
454 // Write first 16 bit of 32 bit value to the mov instruction.
455 // Last 4 bit should be shifted.
456 case ELF::R_ARM_MOVW_ABS_NC:
457 case ELF::R_ARM_MOVT_ABS:
458 if (Type == ELF::R_ARM_MOVW_ABS_NC)
459 Value = Value & 0xFFFF;
460 else if (Type == ELF::R_ARM_MOVT_ABS)
461 Value = (Value >> 16) & 0xFFFF;
462 *TargetPtr &= ~0x000F0FFF;
463 *TargetPtr |= Value & 0xFFF;
464 *TargetPtr |= ((Value >> 12) & 0xF) << 16;
466 // Write 24 bit relative value to the branch instruction.
467 case ELF::R_ARM_PC24: // Fall through.
468 case ELF::R_ARM_CALL: // Fall through.
469 case ELF::R_ARM_JUMP24:
470 int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8);
471 RelValue = (RelValue & 0x03FFFFFC) >> 2;
472 assert((*TargetPtr & 0xFFFFFF) == 0xFFFFFE);
473 *TargetPtr &= 0xFF000000;
474 *TargetPtr |= RelValue;
479 void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section,
480 uint64_t Offset, uint32_t Value,
481 uint32_t Type, int32_t Addend) {
482 uint8_t *TargetPtr = Section.Address + Offset;
485 DEBUG(dbgs() << "resolveMIPSRelocation, LocalAddress: "
486 << Section.Address + Offset << " FinalAddress: "
487 << format("%p", Section.LoadAddress + Offset) << " Value: "
488 << format("%x", Value) << " Type: " << format("%x", Type)
489 << " Addend: " << format("%x", Addend) << "\n");
491 uint32_t Insn = readBytesUnaligned(TargetPtr, 4);
495 llvm_unreachable("Not implemented relocation type!");
498 writeBytesUnaligned(Value, TargetPtr, 4);
502 Insn |= (Value & 0x0fffffff) >> 2;
503 writeBytesUnaligned(Insn, TargetPtr, 4);
505 case ELF::R_MIPS_HI16:
506 // Get the higher 16-bits. Also add 1 if bit 15 is 1.
508 Insn |= ((Value + 0x8000) >> 16) & 0xffff;
509 writeBytesUnaligned(Insn, TargetPtr, 4);
511 case ELF::R_MIPS_LO16:
513 Insn |= Value & 0xffff;
514 writeBytesUnaligned(Insn, TargetPtr, 4);
516 case ELF::R_MIPS_PC32: {
517 uint32_t FinalAddress = (Section.LoadAddress + Offset);
518 writeBytesUnaligned(Value - FinalAddress, (uint8_t *)TargetPtr, 4);
521 case ELF::R_MIPS_PC16: {
522 uint32_t FinalAddress = (Section.LoadAddress + Offset);
524 Insn |= ((Value - FinalAddress) >> 2) & 0xffff;
525 writeBytesUnaligned(Insn, TargetPtr, 4);
528 case ELF::R_MIPS_PC19_S2: {
529 uint32_t FinalAddress = (Section.LoadAddress + Offset);
531 Insn |= ((Value - (FinalAddress & ~0x3)) >> 2) & 0x7ffff;
532 writeBytesUnaligned(Insn, TargetPtr, 4);
535 case ELF::R_MIPS_PC21_S2: {
536 uint32_t FinalAddress = (Section.LoadAddress + Offset);
538 Insn |= ((Value - FinalAddress) >> 2) & 0x1fffff;
539 writeBytesUnaligned(Insn, TargetPtr, 4);
542 case ELF::R_MIPS_PC26_S2: {
543 uint32_t FinalAddress = (Section.LoadAddress + Offset);
545 Insn |= ((Value - FinalAddress) >> 2) & 0x3ffffff;
546 writeBytesUnaligned(Insn, TargetPtr, 4);
549 case ELF::R_MIPS_PCHI16: {
550 uint32_t FinalAddress = (Section.LoadAddress + Offset);
552 Insn |= ((Value - FinalAddress + 0x8000) >> 16) & 0xffff;
553 writeBytesUnaligned(Insn, TargetPtr, 4);
556 case ELF::R_MIPS_PCLO16: {
557 uint32_t FinalAddress = (Section.LoadAddress + Offset);
559 Insn |= (Value - FinalAddress) & 0xffff;
560 writeBytesUnaligned(Insn, TargetPtr, 4);
566 void RuntimeDyldELF::setMipsABI(const ObjectFile &Obj) {
567 if (Arch == Triple::UnknownArch ||
568 !StringRef(Triple::getArchTypePrefix(Arch)).equals("mips")) {
569 IsMipsO32ABI = false;
570 IsMipsN64ABI = false;
574 Obj.getPlatformFlags(AbiVariant);
575 IsMipsO32ABI = AbiVariant & ELF::EF_MIPS_ABI_O32;
576 IsMipsN64ABI = Obj.getFileFormatName().equals("ELF64-mips");
577 if (AbiVariant & ELF::EF_MIPS_ABI2)
578 llvm_unreachable("Mips N32 ABI is not supported yet");
581 void RuntimeDyldELF::resolveMIPS64Relocation(const SectionEntry &Section,
582 uint64_t Offset, uint64_t Value,
583 uint32_t Type, int64_t Addend,
586 uint32_t r_type = Type & 0xff;
587 uint32_t r_type2 = (Type >> 8) & 0xff;
588 uint32_t r_type3 = (Type >> 16) & 0xff;
590 // RelType is used to keep information for which relocation type we are
591 // applying relocation.
592 uint32_t RelType = r_type;
593 int64_t CalculatedValue = evaluateMIPS64Relocation(Section, Offset, Value,
595 SymOffset, SectionID);
596 if (r_type2 != ELF::R_MIPS_NONE) {
598 CalculatedValue = evaluateMIPS64Relocation(Section, Offset, 0, RelType,
599 CalculatedValue, SymOffset,
602 if (r_type3 != ELF::R_MIPS_NONE) {
604 CalculatedValue = evaluateMIPS64Relocation(Section, Offset, 0, RelType,
605 CalculatedValue, SymOffset,
608 applyMIPS64Relocation(Section.Address + Offset, CalculatedValue, RelType);
612 RuntimeDyldELF::evaluateMIPS64Relocation(const SectionEntry &Section,
613 uint64_t Offset, uint64_t Value,
614 uint32_t Type, int64_t Addend,
615 uint64_t SymOffset, SID SectionID) {
617 DEBUG(dbgs() << "evaluateMIPS64Relocation, LocalAddress: 0x"
618 << format("%llx", Section.Address + Offset)
619 << " FinalAddress: 0x"
620 << format("%llx", Section.LoadAddress + Offset)
621 << " Value: 0x" << format("%llx", Value) << " Type: 0x"
622 << format("%x", Type) << " Addend: 0x" << format("%llx", Addend)
623 << " SymOffset: " << format("%x", SymOffset)
628 llvm_unreachable("Not implemented relocation type!");
630 case ELF::R_MIPS_JALR:
631 case ELF::R_MIPS_NONE:
635 return Value + Addend;
637 return ((Value + Addend) >> 2) & 0x3ffffff;
638 case ELF::R_MIPS_GPREL16: {
639 uint64_t GOTAddr = getSectionLoadAddress(SectionToGOTMap[SectionID]);
640 return Value + Addend - (GOTAddr + 0x7ff0);
642 case ELF::R_MIPS_SUB:
643 return Value - Addend;
644 case ELF::R_MIPS_HI16:
645 // Get the higher 16-bits. Also add 1 if bit 15 is 1.
646 return ((Value + Addend + 0x8000) >> 16) & 0xffff;
647 case ELF::R_MIPS_LO16:
648 return (Value + Addend) & 0xffff;
649 case ELF::R_MIPS_CALL16:
650 case ELF::R_MIPS_GOT_DISP:
651 case ELF::R_MIPS_GOT_PAGE: {
652 uint8_t *LocalGOTAddr =
653 getSectionAddress(SectionToGOTMap[SectionID]) + SymOffset;
654 uint64_t GOTEntry = readBytesUnaligned(LocalGOTAddr, 8);
657 if (Type == ELF::R_MIPS_GOT_PAGE)
658 Value = (Value + 0x8000) & ~0xffff;
661 assert(GOTEntry == Value &&
662 "GOT entry has two different addresses.");
664 writeBytesUnaligned(Value, LocalGOTAddr, 8);
666 return (SymOffset - 0x7ff0) & 0xffff;
668 case ELF::R_MIPS_GOT_OFST: {
669 int64_t page = (Value + Addend + 0x8000) & ~0xffff;
670 return (Value + Addend - page) & 0xffff;
672 case ELF::R_MIPS_GPREL32: {
673 uint64_t GOTAddr = getSectionLoadAddress(SectionToGOTMap[SectionID]);
674 return Value + Addend - (GOTAddr + 0x7ff0);
676 case ELF::R_MIPS_PC16: {
677 uint64_t FinalAddress = (Section.LoadAddress + Offset);
678 return ((Value + Addend - FinalAddress) >> 2) & 0xffff;
680 case ELF::R_MIPS_PC32: {
681 uint64_t FinalAddress = (Section.LoadAddress + Offset);
682 return Value + Addend - FinalAddress;
684 case ELF::R_MIPS_PC18_S3: {
685 uint64_t FinalAddress = (Section.LoadAddress + Offset);
686 return ((Value + Addend - (FinalAddress & ~0x7)) >> 3) & 0x3ffff;
688 case ELF::R_MIPS_PC19_S2: {
689 uint64_t FinalAddress = (Section.LoadAddress + Offset);
690 return ((Value + Addend - (FinalAddress & ~0x3)) >> 2) & 0x7ffff;
692 case ELF::R_MIPS_PC21_S2: {
693 uint64_t FinalAddress = (Section.LoadAddress + Offset);
694 return ((Value + Addend - FinalAddress) >> 2) & 0x1fffff;
696 case ELF::R_MIPS_PC26_S2: {
697 uint64_t FinalAddress = (Section.LoadAddress + Offset);
698 return ((Value + Addend - FinalAddress) >> 2) & 0x3ffffff;
700 case ELF::R_MIPS_PCHI16: {
701 uint64_t FinalAddress = (Section.LoadAddress + Offset);
702 return ((Value + Addend - FinalAddress + 0x8000) >> 16) & 0xffff;
704 case ELF::R_MIPS_PCLO16: {
705 uint64_t FinalAddress = (Section.LoadAddress + Offset);
706 return (Value + Addend - FinalAddress) & 0xffff;
712 void RuntimeDyldELF::applyMIPS64Relocation(uint8_t *TargetPtr,
713 int64_t CalculatedValue,
715 uint32_t Insn = readBytesUnaligned(TargetPtr, 4);
721 case ELF::R_MIPS_GPREL32:
722 case ELF::R_MIPS_PC32:
723 writeBytesUnaligned(CalculatedValue & 0xffffffff, TargetPtr, 4);
726 case ELF::R_MIPS_SUB:
727 writeBytesUnaligned(CalculatedValue, TargetPtr, 8);
730 case ELF::R_MIPS_PC26_S2:
731 Insn = (Insn & 0xfc000000) | CalculatedValue;
732 writeBytesUnaligned(Insn, TargetPtr, 4);
734 case ELF::R_MIPS_GPREL16:
735 Insn = (Insn & 0xffff0000) | (CalculatedValue & 0xffff);
736 writeBytesUnaligned(Insn, TargetPtr, 4);
738 case ELF::R_MIPS_HI16:
739 case ELF::R_MIPS_LO16:
740 case ELF::R_MIPS_PCHI16:
741 case ELF::R_MIPS_PCLO16:
742 case ELF::R_MIPS_PC16:
743 case ELF::R_MIPS_CALL16:
744 case ELF::R_MIPS_GOT_DISP:
745 case ELF::R_MIPS_GOT_PAGE:
746 case ELF::R_MIPS_GOT_OFST:
747 Insn = (Insn & 0xffff0000) | CalculatedValue;
748 writeBytesUnaligned(Insn, TargetPtr, 4);
750 case ELF::R_MIPS_PC18_S3:
751 Insn = (Insn & 0xfffc0000) | CalculatedValue;
752 writeBytesUnaligned(Insn, TargetPtr, 4);
754 case ELF::R_MIPS_PC19_S2:
755 Insn = (Insn & 0xfff80000) | CalculatedValue;
756 writeBytesUnaligned(Insn, TargetPtr, 4);
758 case ELF::R_MIPS_PC21_S2:
759 Insn = (Insn & 0xffe00000) | CalculatedValue;
760 writeBytesUnaligned(Insn, TargetPtr, 4);
765 // Return the .TOC. section and offset.
766 void RuntimeDyldELF::findPPC64TOCSection(const ELFObjectFileBase &Obj,
767 ObjSectionToIDMap &LocalSections,
768 RelocationValueRef &Rel) {
769 // Set a default SectionID in case we do not find a TOC section below.
770 // This may happen for references to TOC base base (sym@toc, .odp
771 // relocation) without a .toc directive. In this case just use the
772 // first section (which is usually the .odp) since the code won't
773 // reference the .toc base directly.
774 Rel.SymbolName = nullptr;
777 // The TOC consists of sections .got, .toc, .tocbss, .plt in that
778 // order. The TOC starts where the first of these sections starts.
779 for (auto &Section: Obj.sections()) {
780 StringRef SectionName;
781 check(Section.getName(SectionName));
783 if (SectionName == ".got"
784 || SectionName == ".toc"
785 || SectionName == ".tocbss"
786 || SectionName == ".plt") {
787 Rel.SectionID = findOrEmitSection(Obj, Section, false, LocalSections);
792 // Per the ppc64-elf-linux ABI, The TOC base is TOC value plus 0x8000
793 // thus permitting a full 64 Kbytes segment.
797 // Returns the sections and offset associated with the ODP entry referenced
799 void RuntimeDyldELF::findOPDEntrySection(const ELFObjectFileBase &Obj,
800 ObjSectionToIDMap &LocalSections,
801 RelocationValueRef &Rel) {
802 // Get the ELF symbol value (st_value) to compare with Relocation offset in
804 for (section_iterator si = Obj.section_begin(), se = Obj.section_end();
806 section_iterator RelSecI = si->getRelocatedSection();
807 if (RelSecI == Obj.section_end())
810 StringRef RelSectionName;
811 check(RelSecI->getName(RelSectionName));
812 if (RelSectionName != ".opd")
815 for (elf_relocation_iterator i = si->relocation_begin(),
816 e = si->relocation_end();
818 // The R_PPC64_ADDR64 relocation indicates the first field
820 uint64_t TypeFunc = i->getType();
821 if (TypeFunc != ELF::R_PPC64_ADDR64) {
826 uint64_t TargetSymbolOffset = i->getOffset();
827 symbol_iterator TargetSymbol = i->getSymbol();
828 ErrorOr<int64_t> AddendOrErr = i->getAddend();
829 Check(AddendOrErr.getError());
830 int64_t Addend = *AddendOrErr;
836 // Just check if following relocation is a R_PPC64_TOC
837 uint64_t TypeTOC = i->getType();
838 if (TypeTOC != ELF::R_PPC64_TOC)
841 // Finally compares the Symbol value and the target symbol offset
842 // to check if this .opd entry refers to the symbol the relocation
844 if (Rel.Addend != (int64_t)TargetSymbolOffset)
847 ErrorOr<section_iterator> TSIOrErr = TargetSymbol->getSection();
848 check(TSIOrErr.getError());
849 section_iterator tsi = *TSIOrErr;
850 bool IsCode = tsi->isText();
851 Rel.SectionID = findOrEmitSection(Obj, (*tsi), IsCode, LocalSections);
852 Rel.Addend = (intptr_t)Addend;
856 llvm_unreachable("Attempting to get address of ODP entry!");
859 // Relocation masks following the #lo(value), #hi(value), #ha(value),
860 // #higher(value), #highera(value), #highest(value), and #highesta(value)
861 // macros defined in section 4.5.1. Relocation Types of the PPC-elf64abi
864 static inline uint16_t applyPPClo(uint64_t value) { return value & 0xffff; }
866 static inline uint16_t applyPPChi(uint64_t value) {
867 return (value >> 16) & 0xffff;
870 static inline uint16_t applyPPCha (uint64_t value) {
871 return ((value + 0x8000) >> 16) & 0xffff;
874 static inline uint16_t applyPPChigher(uint64_t value) {
875 return (value >> 32) & 0xffff;
878 static inline uint16_t applyPPChighera (uint64_t value) {
879 return ((value + 0x8000) >> 32) & 0xffff;
882 static inline uint16_t applyPPChighest(uint64_t value) {
883 return (value >> 48) & 0xffff;
886 static inline uint16_t applyPPChighesta (uint64_t value) {
887 return ((value + 0x8000) >> 48) & 0xffff;
890 void RuntimeDyldELF::resolvePPC32Relocation(const SectionEntry &Section,
891 uint64_t Offset, uint64_t Value,
892 uint32_t Type, int64_t Addend) {
893 uint8_t *LocalAddress = Section.Address + Offset;
896 llvm_unreachable("Relocation type not implemented yet!");
898 case ELF::R_PPC_ADDR16_LO:
899 writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
901 case ELF::R_PPC_ADDR16_HI:
902 writeInt16BE(LocalAddress, applyPPChi(Value + Addend));
904 case ELF::R_PPC_ADDR16_HA:
905 writeInt16BE(LocalAddress, applyPPCha(Value + Addend));
910 void RuntimeDyldELF::resolvePPC64Relocation(const SectionEntry &Section,
911 uint64_t Offset, uint64_t Value,
912 uint32_t Type, int64_t Addend) {
913 uint8_t *LocalAddress = Section.Address + Offset;
916 llvm_unreachable("Relocation type not implemented yet!");
918 case ELF::R_PPC64_ADDR16:
919 writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
921 case ELF::R_PPC64_ADDR16_DS:
922 writeInt16BE(LocalAddress, applyPPClo(Value + Addend) & ~3);
924 case ELF::R_PPC64_ADDR16_LO:
925 writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
927 case ELF::R_PPC64_ADDR16_LO_DS:
928 writeInt16BE(LocalAddress, applyPPClo(Value + Addend) & ~3);
930 case ELF::R_PPC64_ADDR16_HI:
931 writeInt16BE(LocalAddress, applyPPChi(Value + Addend));
933 case ELF::R_PPC64_ADDR16_HA:
934 writeInt16BE(LocalAddress, applyPPCha(Value + Addend));
936 case ELF::R_PPC64_ADDR16_HIGHER:
937 writeInt16BE(LocalAddress, applyPPChigher(Value + Addend));
939 case ELF::R_PPC64_ADDR16_HIGHERA:
940 writeInt16BE(LocalAddress, applyPPChighera(Value + Addend));
942 case ELF::R_PPC64_ADDR16_HIGHEST:
943 writeInt16BE(LocalAddress, applyPPChighest(Value + Addend));
945 case ELF::R_PPC64_ADDR16_HIGHESTA:
946 writeInt16BE(LocalAddress, applyPPChighesta(Value + Addend));
948 case ELF::R_PPC64_ADDR14: {
949 assert(((Value + Addend) & 3) == 0);
950 // Preserve the AA/LK bits in the branch instruction
951 uint8_t aalk = *(LocalAddress + 3);
952 writeInt16BE(LocalAddress + 2, (aalk & 3) | ((Value + Addend) & 0xfffc));
954 case ELF::R_PPC64_REL16_LO: {
955 uint64_t FinalAddress = (Section.LoadAddress + Offset);
956 uint64_t Delta = Value - FinalAddress + Addend;
957 writeInt16BE(LocalAddress, applyPPClo(Delta));
959 case ELF::R_PPC64_REL16_HI: {
960 uint64_t FinalAddress = (Section.LoadAddress + Offset);
961 uint64_t Delta = Value - FinalAddress + Addend;
962 writeInt16BE(LocalAddress, applyPPChi(Delta));
964 case ELF::R_PPC64_REL16_HA: {
965 uint64_t FinalAddress = (Section.LoadAddress + Offset);
966 uint64_t Delta = Value - FinalAddress + Addend;
967 writeInt16BE(LocalAddress, applyPPCha(Delta));
969 case ELF::R_PPC64_ADDR32: {
970 int32_t Result = static_cast<int32_t>(Value + Addend);
971 if (SignExtend32<32>(Result) != Result)
972 llvm_unreachable("Relocation R_PPC64_ADDR32 overflow");
973 writeInt32BE(LocalAddress, Result);
975 case ELF::R_PPC64_REL24: {
976 uint64_t FinalAddress = (Section.LoadAddress + Offset);
977 int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
978 if (SignExtend32<24>(delta) != delta)
979 llvm_unreachable("Relocation R_PPC64_REL24 overflow");
980 // Generates a 'bl <address>' instruction
981 writeInt32BE(LocalAddress, 0x48000001 | (delta & 0x03FFFFFC));
983 case ELF::R_PPC64_REL32: {
984 uint64_t FinalAddress = (Section.LoadAddress + Offset);
985 int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
986 if (SignExtend32<32>(delta) != delta)
987 llvm_unreachable("Relocation R_PPC64_REL32 overflow");
988 writeInt32BE(LocalAddress, delta);
990 case ELF::R_PPC64_REL64: {
991 uint64_t FinalAddress = (Section.LoadAddress + Offset);
992 uint64_t Delta = Value - FinalAddress + Addend;
993 writeInt64BE(LocalAddress, Delta);
995 case ELF::R_PPC64_ADDR64:
996 writeInt64BE(LocalAddress, Value + Addend);
1001 void RuntimeDyldELF::resolveSystemZRelocation(const SectionEntry &Section,
1002 uint64_t Offset, uint64_t Value,
1003 uint32_t Type, int64_t Addend) {
1004 uint8_t *LocalAddress = Section.Address + Offset;
1007 llvm_unreachable("Relocation type not implemented yet!");
1009 case ELF::R_390_PC16DBL:
1010 case ELF::R_390_PLT16DBL: {
1011 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset);
1012 assert(int16_t(Delta / 2) * 2 == Delta && "R_390_PC16DBL overflow");
1013 writeInt16BE(LocalAddress, Delta / 2);
1016 case ELF::R_390_PC32DBL:
1017 case ELF::R_390_PLT32DBL: {
1018 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset);
1019 assert(int32_t(Delta / 2) * 2 == Delta && "R_390_PC32DBL overflow");
1020 writeInt32BE(LocalAddress, Delta / 2);
1023 case ELF::R_390_PC32: {
1024 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset);
1025 assert(int32_t(Delta) == Delta && "R_390_PC32 overflow");
1026 writeInt32BE(LocalAddress, Delta);
1030 writeInt64BE(LocalAddress, Value + Addend);
1035 // The target location for the relocation is described by RE.SectionID and
1036 // RE.Offset. RE.SectionID can be used to find the SectionEntry. Each
1037 // SectionEntry has three members describing its location.
1038 // SectionEntry::Address is the address at which the section has been loaded
1039 // into memory in the current (host) process. SectionEntry::LoadAddress is the
1040 // address that the section will have in the target process.
1041 // SectionEntry::ObjAddress is the address of the bits for this section in the
1042 // original emitted object image (also in the current address space).
1044 // Relocations will be applied as if the section were loaded at
1045 // SectionEntry::LoadAddress, but they will be applied at an address based
1046 // on SectionEntry::Address. SectionEntry::ObjAddress will be used to refer to
1047 // Target memory contents if they are required for value calculations.
1049 // The Value parameter here is the load address of the symbol for the
1050 // relocation to be applied. For relocations which refer to symbols in the
1051 // current object Value will be the LoadAddress of the section in which
1052 // the symbol resides (RE.Addend provides additional information about the
1053 // symbol location). For external symbols, Value will be the address of the
1054 // symbol in the target address space.
1055 void RuntimeDyldELF::resolveRelocation(const RelocationEntry &RE,
1057 const SectionEntry &Section = Sections[RE.SectionID];
1058 return resolveRelocation(Section, RE.Offset, Value, RE.RelType, RE.Addend,
1059 RE.SymOffset, RE.SectionID);
1062 void RuntimeDyldELF::resolveRelocation(const SectionEntry &Section,
1063 uint64_t Offset, uint64_t Value,
1064 uint32_t Type, int64_t Addend,
1065 uint64_t SymOffset, SID SectionID) {
1067 case Triple::x86_64:
1068 resolveX86_64Relocation(Section, Offset, Value, Type, Addend, SymOffset);
1071 resolveX86Relocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type,
1072 (uint32_t)(Addend & 0xffffffffL));
1074 case Triple::aarch64:
1075 case Triple::aarch64_be:
1076 resolveAArch64Relocation(Section, Offset, Value, Type, Addend);
1078 case Triple::arm: // Fall through.
1081 case Triple::thumbeb:
1082 resolveARMRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type,
1083 (uint32_t)(Addend & 0xffffffffL));
1085 case Triple::mips: // Fall through.
1086 case Triple::mipsel:
1087 case Triple::mips64:
1088 case Triple::mips64el:
1090 resolveMIPSRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL),
1091 Type, (uint32_t)(Addend & 0xffffffffL));
1092 else if (IsMipsN64ABI)
1093 resolveMIPS64Relocation(Section, Offset, Value, Type, Addend, SymOffset,
1096 llvm_unreachable("Mips ABI not handled");
1099 resolvePPC32Relocation(Section, Offset, Value, Type, Addend);
1101 case Triple::ppc64: // Fall through.
1102 case Triple::ppc64le:
1103 resolvePPC64Relocation(Section, Offset, Value, Type, Addend);
1105 case Triple::systemz:
1106 resolveSystemZRelocation(Section, Offset, Value, Type, Addend);
1109 llvm_unreachable("Unsupported CPU type!");
1113 void *RuntimeDyldELF::computePlaceholderAddress(unsigned SectionID, uint64_t Offset) const {
1114 return (void*)(Sections[SectionID].ObjAddress + Offset);
1117 void RuntimeDyldELF::processSimpleRelocation(unsigned SectionID, uint64_t Offset, unsigned RelType, RelocationValueRef Value) {
1118 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend, Value.Offset);
1119 if (Value.SymbolName)
1120 addRelocationForSymbol(RE, Value.SymbolName);
1122 addRelocationForSection(RE, Value.SectionID);
1125 uint32_t RuntimeDyldELF::getMatchingLoRelocation(uint32_t RelType,
1126 bool IsLocal) const {
1128 case ELF::R_MICROMIPS_GOT16:
1130 return ELF::R_MICROMIPS_LO16;
1132 case ELF::R_MICROMIPS_HI16:
1133 return ELF::R_MICROMIPS_LO16;
1134 case ELF::R_MIPS_GOT16:
1136 return ELF::R_MIPS_LO16;
1138 case ELF::R_MIPS_HI16:
1139 return ELF::R_MIPS_LO16;
1140 case ELF::R_MIPS_PCHI16:
1141 return ELF::R_MIPS_PCLO16;
1145 return ELF::R_MIPS_NONE;
1148 relocation_iterator RuntimeDyldELF::processRelocationRef(
1149 unsigned SectionID, relocation_iterator RelI, const ObjectFile &O,
1150 ObjSectionToIDMap &ObjSectionToID, StubMap &Stubs) {
1151 const auto &Obj = cast<ELFObjectFileBase>(O);
1152 uint64_t RelType = RelI->getType();
1153 ErrorOr<int64_t> AddendOrErr = ELFRelocationRef(*RelI).getAddend();
1154 int64_t Addend = AddendOrErr ? *AddendOrErr : 0;
1155 elf_symbol_iterator Symbol = RelI->getSymbol();
1157 // Obtain the symbol name which is referenced in the relocation
1158 StringRef TargetName;
1159 if (Symbol != Obj.symbol_end()) {
1160 ErrorOr<StringRef> TargetNameOrErr = Symbol->getName();
1161 if (std::error_code EC = TargetNameOrErr.getError())
1162 report_fatal_error(EC.message());
1163 TargetName = *TargetNameOrErr;
1165 DEBUG(dbgs() << "\t\tRelType: " << RelType << " Addend: " << Addend
1166 << " TargetName: " << TargetName << "\n");
1167 RelocationValueRef Value;
1168 // First search for the symbol in the local symbol table
1169 SymbolRef::Type SymType = SymbolRef::ST_Unknown;
1171 // Search for the symbol in the global symbol table
1172 RTDyldSymbolTable::const_iterator gsi = GlobalSymbolTable.end();
1173 if (Symbol != Obj.symbol_end()) {
1174 gsi = GlobalSymbolTable.find(TargetName.data());
1175 SymType = Symbol->getType();
1177 if (gsi != GlobalSymbolTable.end()) {
1178 const auto &SymInfo = gsi->second;
1179 Value.SectionID = SymInfo.getSectionID();
1180 Value.Offset = SymInfo.getOffset();
1181 Value.Addend = SymInfo.getOffset() + Addend;
1184 case SymbolRef::ST_Debug: {
1185 // TODO: Now ELF SymbolRef::ST_Debug = STT_SECTION, it's not obviously
1186 // and can be changed by another developers. Maybe best way is add
1187 // a new symbol type ST_Section to SymbolRef and use it.
1188 section_iterator si = *Symbol->getSection();
1189 if (si == Obj.section_end())
1190 llvm_unreachable("Symbol section not found, bad object file format!");
1191 DEBUG(dbgs() << "\t\tThis is section symbol\n");
1192 bool isCode = si->isText();
1193 Value.SectionID = findOrEmitSection(Obj, (*si), isCode, ObjSectionToID);
1194 Value.Addend = Addend;
1197 case SymbolRef::ST_Data:
1198 case SymbolRef::ST_Unknown: {
1199 Value.SymbolName = TargetName.data();
1200 Value.Addend = Addend;
1202 // Absolute relocations will have a zero symbol ID (STN_UNDEF), which
1203 // will manifest here as a NULL symbol name.
1204 // We can set this as a valid (but empty) symbol name, and rely
1205 // on addRelocationForSymbol to handle this.
1206 if (!Value.SymbolName)
1207 Value.SymbolName = "";
1211 llvm_unreachable("Unresolved symbol type!");
1216 uint64_t Offset = RelI->getOffset();
1218 DEBUG(dbgs() << "\t\tSectionID: " << SectionID << " Offset: " << Offset
1220 if ((Arch == Triple::aarch64 || Arch == Triple::aarch64_be) &&
1221 (RelType == ELF::R_AARCH64_CALL26 || RelType == ELF::R_AARCH64_JUMP26)) {
1222 // This is an AArch64 branch relocation, need to use a stub function.
1223 DEBUG(dbgs() << "\t\tThis is an AArch64 branch relocation.");
1224 SectionEntry &Section = Sections[SectionID];
1226 // Look for an existing stub.
1227 StubMap::const_iterator i = Stubs.find(Value);
1228 if (i != Stubs.end()) {
1229 resolveRelocation(Section, Offset, (uint64_t)Section.Address + i->second,
1231 DEBUG(dbgs() << " Stub function found\n");
1233 // Create a new stub function.
1234 DEBUG(dbgs() << " Create a new stub function\n");
1235 Stubs[Value] = Section.StubOffset;
1236 uint8_t *StubTargetAddr =
1237 createStubFunction(Section.Address + Section.StubOffset);
1239 RelocationEntry REmovz_g3(SectionID, StubTargetAddr - Section.Address,
1240 ELF::R_AARCH64_MOVW_UABS_G3, Value.Addend);
1241 RelocationEntry REmovk_g2(SectionID, StubTargetAddr - Section.Address + 4,
1242 ELF::R_AARCH64_MOVW_UABS_G2_NC, Value.Addend);
1243 RelocationEntry REmovk_g1(SectionID, StubTargetAddr - Section.Address + 8,
1244 ELF::R_AARCH64_MOVW_UABS_G1_NC, Value.Addend);
1245 RelocationEntry REmovk_g0(SectionID,
1246 StubTargetAddr - Section.Address + 12,
1247 ELF::R_AARCH64_MOVW_UABS_G0_NC, Value.Addend);
1249 if (Value.SymbolName) {
1250 addRelocationForSymbol(REmovz_g3, Value.SymbolName);
1251 addRelocationForSymbol(REmovk_g2, Value.SymbolName);
1252 addRelocationForSymbol(REmovk_g1, Value.SymbolName);
1253 addRelocationForSymbol(REmovk_g0, Value.SymbolName);
1255 addRelocationForSection(REmovz_g3, Value.SectionID);
1256 addRelocationForSection(REmovk_g2, Value.SectionID);
1257 addRelocationForSection(REmovk_g1, Value.SectionID);
1258 addRelocationForSection(REmovk_g0, Value.SectionID);
1260 resolveRelocation(Section, Offset,
1261 (uint64_t)Section.Address + Section.StubOffset, RelType,
1263 Section.StubOffset += getMaxStubSize();
1265 } else if (Arch == Triple::arm) {
1266 if (RelType == ELF::R_ARM_PC24 || RelType == ELF::R_ARM_CALL ||
1267 RelType == ELF::R_ARM_JUMP24) {
1268 // This is an ARM branch relocation, need to use a stub function.
1269 DEBUG(dbgs() << "\t\tThis is an ARM branch relocation.");
1270 SectionEntry &Section = Sections[SectionID];
1272 // Look for an existing stub.
1273 StubMap::const_iterator i = Stubs.find(Value);
1274 if (i != Stubs.end()) {
1275 resolveRelocation(Section, Offset, (uint64_t)Section.Address + i->second,
1277 DEBUG(dbgs() << " Stub function found\n");
1279 // Create a new stub function.
1280 DEBUG(dbgs() << " Create a new stub function\n");
1281 Stubs[Value] = Section.StubOffset;
1282 uint8_t *StubTargetAddr =
1283 createStubFunction(Section.Address + Section.StubOffset);
1284 RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
1285 ELF::R_ARM_ABS32, Value.Addend);
1286 if (Value.SymbolName)
1287 addRelocationForSymbol(RE, Value.SymbolName);
1289 addRelocationForSection(RE, Value.SectionID);
1291 resolveRelocation(Section, Offset,
1292 (uint64_t)Section.Address + Section.StubOffset, RelType,
1294 Section.StubOffset += getMaxStubSize();
1297 uint32_t *Placeholder =
1298 reinterpret_cast<uint32_t*>(computePlaceholderAddress(SectionID, Offset));
1299 if (RelType == ELF::R_ARM_PREL31 || RelType == ELF::R_ARM_TARGET1 ||
1300 RelType == ELF::R_ARM_ABS32) {
1301 Value.Addend += *Placeholder;
1302 } else if (RelType == ELF::R_ARM_MOVW_ABS_NC || RelType == ELF::R_ARM_MOVT_ABS) {
1303 // See ELF for ARM documentation
1304 Value.Addend += (int16_t)((*Placeholder & 0xFFF) | (((*Placeholder >> 16) & 0xF) << 12));
1306 processSimpleRelocation(SectionID, Offset, RelType, Value);
1308 } else if (IsMipsO32ABI) {
1309 uint8_t *Placeholder = reinterpret_cast<uint8_t *>(
1310 computePlaceholderAddress(SectionID, Offset));
1311 uint32_t Opcode = readBytesUnaligned(Placeholder, 4);
1312 if (RelType == ELF::R_MIPS_26) {
1313 // This is an Mips branch relocation, need to use a stub function.
1314 DEBUG(dbgs() << "\t\tThis is a Mips branch relocation.");
1315 SectionEntry &Section = Sections[SectionID];
1317 // Extract the addend from the instruction.
1318 // We shift up by two since the Value will be down shifted again
1319 // when applying the relocation.
1320 uint32_t Addend = (Opcode & 0x03ffffff) << 2;
1322 Value.Addend += Addend;
1324 // Look up for existing stub.
1325 StubMap::const_iterator i = Stubs.find(Value);
1326 if (i != Stubs.end()) {
1327 RelocationEntry RE(SectionID, Offset, RelType, i->second);
1328 addRelocationForSection(RE, SectionID);
1329 DEBUG(dbgs() << " Stub function found\n");
1331 // Create a new stub function.
1332 DEBUG(dbgs() << " Create a new stub function\n");
1333 Stubs[Value] = Section.StubOffset;
1334 uint8_t *StubTargetAddr =
1335 createStubFunction(Section.Address + Section.StubOffset);
1337 // Creating Hi and Lo relocations for the filled stub instructions.
1338 RelocationEntry REHi(SectionID, StubTargetAddr - Section.Address,
1339 ELF::R_MIPS_HI16, Value.Addend);
1340 RelocationEntry RELo(SectionID, StubTargetAddr - Section.Address + 4,
1341 ELF::R_MIPS_LO16, Value.Addend);
1343 if (Value.SymbolName) {
1344 addRelocationForSymbol(REHi, Value.SymbolName);
1345 addRelocationForSymbol(RELo, Value.SymbolName);
1348 addRelocationForSection(REHi, Value.SectionID);
1349 addRelocationForSection(RELo, Value.SectionID);
1352 RelocationEntry RE(SectionID, Offset, RelType, Section.StubOffset);
1353 addRelocationForSection(RE, SectionID);
1354 Section.StubOffset += getMaxStubSize();
1356 } else if (RelType == ELF::R_MIPS_HI16 || RelType == ELF::R_MIPS_PCHI16) {
1357 int64_t Addend = (Opcode & 0x0000ffff) << 16;
1358 RelocationEntry RE(SectionID, Offset, RelType, Addend);
1359 PendingRelocs.push_back(std::make_pair(Value, RE));
1360 } else if (RelType == ELF::R_MIPS_LO16 || RelType == ELF::R_MIPS_PCLO16) {
1361 int64_t Addend = Value.Addend + SignExtend32<16>(Opcode & 0x0000ffff);
1362 for (auto I = PendingRelocs.begin(); I != PendingRelocs.end();) {
1363 const RelocationValueRef &MatchingValue = I->first;
1364 RelocationEntry &Reloc = I->second;
1365 if (MatchingValue == Value &&
1366 RelType == getMatchingLoRelocation(Reloc.RelType) &&
1367 SectionID == Reloc.SectionID) {
1368 Reloc.Addend += Addend;
1369 if (Value.SymbolName)
1370 addRelocationForSymbol(Reloc, Value.SymbolName);
1372 addRelocationForSection(Reloc, Value.SectionID);
1373 I = PendingRelocs.erase(I);
1377 RelocationEntry RE(SectionID, Offset, RelType, Addend);
1378 if (Value.SymbolName)
1379 addRelocationForSymbol(RE, Value.SymbolName);
1381 addRelocationForSection(RE, Value.SectionID);
1383 if (RelType == ELF::R_MIPS_32)
1384 Value.Addend += Opcode;
1385 else if (RelType == ELF::R_MIPS_PC16)
1386 Value.Addend += SignExtend32<18>((Opcode & 0x0000ffff) << 2);
1387 else if (RelType == ELF::R_MIPS_PC19_S2)
1388 Value.Addend += SignExtend32<21>((Opcode & 0x0007ffff) << 2);
1389 else if (RelType == ELF::R_MIPS_PC21_S2)
1390 Value.Addend += SignExtend32<23>((Opcode & 0x001fffff) << 2);
1391 else if (RelType == ELF::R_MIPS_PC26_S2)
1392 Value.Addend += SignExtend32<28>((Opcode & 0x03ffffff) << 2);
1393 processSimpleRelocation(SectionID, Offset, RelType, Value);
1395 } else if (IsMipsN64ABI) {
1396 uint32_t r_type = RelType & 0xff;
1397 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
1398 if (r_type == ELF::R_MIPS_CALL16 || r_type == ELF::R_MIPS_GOT_PAGE
1399 || r_type == ELF::R_MIPS_GOT_DISP) {
1400 StringMap<uint64_t>::iterator i = GOTSymbolOffsets.find(TargetName);
1401 if (i != GOTSymbolOffsets.end())
1402 RE.SymOffset = i->second;
1404 RE.SymOffset = allocateGOTEntries(SectionID, 1);
1405 GOTSymbolOffsets[TargetName] = RE.SymOffset;
1408 if (Value.SymbolName)
1409 addRelocationForSymbol(RE, Value.SymbolName);
1411 addRelocationForSection(RE, Value.SectionID);
1412 } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
1413 if (RelType == ELF::R_PPC64_REL24) {
1414 // Determine ABI variant in use for this object.
1415 unsigned AbiVariant;
1416 Obj.getPlatformFlags(AbiVariant);
1417 AbiVariant &= ELF::EF_PPC64_ABI;
1418 // A PPC branch relocation will need a stub function if the target is
1419 // an external symbol (Symbol::ST_Unknown) or if the target address
1420 // is not within the signed 24-bits branch address.
1421 SectionEntry &Section = Sections[SectionID];
1422 uint8_t *Target = Section.Address + Offset;
1423 bool RangeOverflow = false;
1424 if (SymType != SymbolRef::ST_Unknown) {
1425 if (AbiVariant != 2) {
1426 // In the ELFv1 ABI, a function call may point to the .opd entry,
1427 // so the final symbol value is calculated based on the relocation
1428 // values in the .opd section.
1429 findOPDEntrySection(Obj, ObjSectionToID, Value);
1431 // In the ELFv2 ABI, a function symbol may provide a local entry
1432 // point, which must be used for direct calls.
1433 uint8_t SymOther = Symbol->getOther();
1434 Value.Addend += ELF::decodePPC64LocalEntryOffset(SymOther);
1436 uint8_t *RelocTarget = Sections[Value.SectionID].Address + Value.Addend;
1437 int32_t delta = static_cast<int32_t>(Target - RelocTarget);
1438 // If it is within 24-bits branch range, just set the branch target
1439 if (SignExtend32<24>(delta) == delta) {
1440 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
1441 if (Value.SymbolName)
1442 addRelocationForSymbol(RE, Value.SymbolName);
1444 addRelocationForSection(RE, Value.SectionID);
1446 RangeOverflow = true;
1449 if (SymType == SymbolRef::ST_Unknown || RangeOverflow) {
1450 // It is an external symbol (SymbolRef::ST_Unknown) or within a range
1451 // larger than 24-bits.
1452 StubMap::const_iterator i = Stubs.find(Value);
1453 if (i != Stubs.end()) {
1454 // Symbol function stub already created, just relocate to it
1455 resolveRelocation(Section, Offset,
1456 (uint64_t)Section.Address + i->second, RelType, 0);
1457 DEBUG(dbgs() << " Stub function found\n");
1459 // Create a new stub function.
1460 DEBUG(dbgs() << " Create a new stub function\n");
1461 Stubs[Value] = Section.StubOffset;
1462 uint8_t *StubTargetAddr =
1463 createStubFunction(Section.Address + Section.StubOffset,
1465 RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
1466 ELF::R_PPC64_ADDR64, Value.Addend);
1468 // Generates the 64-bits address loads as exemplified in section
1469 // 4.5.1 in PPC64 ELF ABI. Note that the relocations need to
1470 // apply to the low part of the instructions, so we have to update
1471 // the offset according to the target endianness.
1472 uint64_t StubRelocOffset = StubTargetAddr - Section.Address;
1473 if (!IsTargetLittleEndian)
1474 StubRelocOffset += 2;
1476 RelocationEntry REhst(SectionID, StubRelocOffset + 0,
1477 ELF::R_PPC64_ADDR16_HIGHEST, Value.Addend);
1478 RelocationEntry REhr(SectionID, StubRelocOffset + 4,
1479 ELF::R_PPC64_ADDR16_HIGHER, Value.Addend);
1480 RelocationEntry REh(SectionID, StubRelocOffset + 12,
1481 ELF::R_PPC64_ADDR16_HI, Value.Addend);
1482 RelocationEntry REl(SectionID, StubRelocOffset + 16,
1483 ELF::R_PPC64_ADDR16_LO, Value.Addend);
1485 if (Value.SymbolName) {
1486 addRelocationForSymbol(REhst, Value.SymbolName);
1487 addRelocationForSymbol(REhr, Value.SymbolName);
1488 addRelocationForSymbol(REh, Value.SymbolName);
1489 addRelocationForSymbol(REl, Value.SymbolName);
1491 addRelocationForSection(REhst, Value.SectionID);
1492 addRelocationForSection(REhr, Value.SectionID);
1493 addRelocationForSection(REh, Value.SectionID);
1494 addRelocationForSection(REl, Value.SectionID);
1497 resolveRelocation(Section, Offset,
1498 (uint64_t)Section.Address + Section.StubOffset,
1500 Section.StubOffset += getMaxStubSize();
1502 if (SymType == SymbolRef::ST_Unknown) {
1503 // Restore the TOC for external calls
1504 if (AbiVariant == 2)
1505 writeInt32BE(Target + 4, 0xE8410018); // ld r2,28(r1)
1507 writeInt32BE(Target + 4, 0xE8410028); // ld r2,40(r1)
1510 } else if (RelType == ELF::R_PPC64_TOC16 ||
1511 RelType == ELF::R_PPC64_TOC16_DS ||
1512 RelType == ELF::R_PPC64_TOC16_LO ||
1513 RelType == ELF::R_PPC64_TOC16_LO_DS ||
1514 RelType == ELF::R_PPC64_TOC16_HI ||
1515 RelType == ELF::R_PPC64_TOC16_HA) {
1516 // These relocations are supposed to subtract the TOC address from
1517 // the final value. This does not fit cleanly into the RuntimeDyld
1518 // scheme, since there may be *two* sections involved in determining
1519 // the relocation value (the section of the symbol referred to by the
1520 // relocation, and the TOC section associated with the current module).
1522 // Fortunately, these relocations are currently only ever generated
1523 // referring to symbols that themselves reside in the TOC, which means
1524 // that the two sections are actually the same. Thus they cancel out
1525 // and we can immediately resolve the relocation right now.
1527 case ELF::R_PPC64_TOC16: RelType = ELF::R_PPC64_ADDR16; break;
1528 case ELF::R_PPC64_TOC16_DS: RelType = ELF::R_PPC64_ADDR16_DS; break;
1529 case ELF::R_PPC64_TOC16_LO: RelType = ELF::R_PPC64_ADDR16_LO; break;
1530 case ELF::R_PPC64_TOC16_LO_DS: RelType = ELF::R_PPC64_ADDR16_LO_DS; break;
1531 case ELF::R_PPC64_TOC16_HI: RelType = ELF::R_PPC64_ADDR16_HI; break;
1532 case ELF::R_PPC64_TOC16_HA: RelType = ELF::R_PPC64_ADDR16_HA; break;
1533 default: llvm_unreachable("Wrong relocation type.");
1536 RelocationValueRef TOCValue;
1537 findPPC64TOCSection(Obj, ObjSectionToID, TOCValue);
1538 if (Value.SymbolName || Value.SectionID != TOCValue.SectionID)
1539 llvm_unreachable("Unsupported TOC relocation.");
1540 Value.Addend -= TOCValue.Addend;
1541 resolveRelocation(Sections[SectionID], Offset, Value.Addend, RelType, 0);
1543 // There are two ways to refer to the TOC address directly: either
1544 // via a ELF::R_PPC64_TOC relocation (where both symbol and addend are
1545 // ignored), or via any relocation that refers to the magic ".TOC."
1546 // symbols (in which case the addend is respected).
1547 if (RelType == ELF::R_PPC64_TOC) {
1548 RelType = ELF::R_PPC64_ADDR64;
1549 findPPC64TOCSection(Obj, ObjSectionToID, Value);
1550 } else if (TargetName == ".TOC.") {
1551 findPPC64TOCSection(Obj, ObjSectionToID, Value);
1552 Value.Addend += Addend;
1555 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
1557 if (Value.SymbolName)
1558 addRelocationForSymbol(RE, Value.SymbolName);
1560 addRelocationForSection(RE, Value.SectionID);
1562 } else if (Arch == Triple::systemz &&
1563 (RelType == ELF::R_390_PLT32DBL || RelType == ELF::R_390_GOTENT)) {
1564 // Create function stubs for both PLT and GOT references, regardless of
1565 // whether the GOT reference is to data or code. The stub contains the
1566 // full address of the symbol, as needed by GOT references, and the
1567 // executable part only adds an overhead of 8 bytes.
1569 // We could try to conserve space by allocating the code and data
1570 // parts of the stub separately. However, as things stand, we allocate
1571 // a stub for every relocation, so using a GOT in JIT code should be
1572 // no less space efficient than using an explicit constant pool.
1573 DEBUG(dbgs() << "\t\tThis is a SystemZ indirect relocation.");
1574 SectionEntry &Section = Sections[SectionID];
1576 // Look for an existing stub.
1577 StubMap::const_iterator i = Stubs.find(Value);
1578 uintptr_t StubAddress;
1579 if (i != Stubs.end()) {
1580 StubAddress = uintptr_t(Section.Address) + i->second;
1581 DEBUG(dbgs() << " Stub function found\n");
1583 // Create a new stub function.
1584 DEBUG(dbgs() << " Create a new stub function\n");
1586 uintptr_t BaseAddress = uintptr_t(Section.Address);
1587 uintptr_t StubAlignment = getStubAlignment();
1588 StubAddress = (BaseAddress + Section.StubOffset + StubAlignment - 1) &
1590 unsigned StubOffset = StubAddress - BaseAddress;
1592 Stubs[Value] = StubOffset;
1593 createStubFunction((uint8_t *)StubAddress);
1594 RelocationEntry RE(SectionID, StubOffset + 8, ELF::R_390_64,
1596 if (Value.SymbolName)
1597 addRelocationForSymbol(RE, Value.SymbolName);
1599 addRelocationForSection(RE, Value.SectionID);
1600 Section.StubOffset = StubOffset + getMaxStubSize();
1603 if (RelType == ELF::R_390_GOTENT)
1604 resolveRelocation(Section, Offset, StubAddress + 8, ELF::R_390_PC32DBL,
1607 resolveRelocation(Section, Offset, StubAddress, RelType, Addend);
1608 } else if (Arch == Triple::x86_64) {
1609 if (RelType == ELF::R_X86_64_PLT32) {
1610 // The way the PLT relocations normally work is that the linker allocates
1612 // PLT and this relocation makes a PC-relative call into the PLT. The PLT
1613 // entry will then jump to an address provided by the GOT. On first call,
1615 // GOT address will point back into PLT code that resolves the symbol. After
1616 // the first call, the GOT entry points to the actual function.
1618 // For local functions we're ignoring all of that here and just replacing
1619 // the PLT32 relocation type with PC32, which will translate the relocation
1620 // into a PC-relative call directly to the function. For external symbols we
1621 // can't be sure the function will be within 2^32 bytes of the call site, so
1622 // we need to create a stub, which calls into the GOT. This case is
1623 // equivalent to the usual PLT implementation except that we use the stub
1624 // mechanism in RuntimeDyld (which puts stubs at the end of the section)
1625 // rather than allocating a PLT section.
1626 if (Value.SymbolName) {
1627 // This is a call to an external function.
1628 // Look for an existing stub.
1629 SectionEntry &Section = Sections[SectionID];
1630 StubMap::const_iterator i = Stubs.find(Value);
1631 uintptr_t StubAddress;
1632 if (i != Stubs.end()) {
1633 StubAddress = uintptr_t(Section.Address) + i->second;
1634 DEBUG(dbgs() << " Stub function found\n");
1636 // Create a new stub function (equivalent to a PLT entry).
1637 DEBUG(dbgs() << " Create a new stub function\n");
1639 uintptr_t BaseAddress = uintptr_t(Section.Address);
1640 uintptr_t StubAlignment = getStubAlignment();
1641 StubAddress = (BaseAddress + Section.StubOffset + StubAlignment - 1) &
1643 unsigned StubOffset = StubAddress - BaseAddress;
1644 Stubs[Value] = StubOffset;
1645 createStubFunction((uint8_t *)StubAddress);
1647 // Bump our stub offset counter
1648 Section.StubOffset = StubOffset + getMaxStubSize();
1650 // Allocate a GOT Entry
1651 uint64_t GOTOffset = allocateGOTEntries(SectionID, 1);
1653 // The load of the GOT address has an addend of -4
1654 resolveGOTOffsetRelocation(SectionID, StubOffset + 2, GOTOffset - 4);
1656 // Fill in the value of the symbol we're targeting into the GOT
1657 addRelocationForSymbol(computeGOTOffsetRE(SectionID,GOTOffset,0,ELF::R_X86_64_64),
1661 // Make the target call a call into the stub table.
1662 resolveRelocation(Section, Offset, StubAddress, ELF::R_X86_64_PC32,
1665 RelocationEntry RE(SectionID, Offset, ELF::R_X86_64_PC32, Value.Addend,
1667 addRelocationForSection(RE, Value.SectionID);
1669 } else if (RelType == ELF::R_X86_64_GOTPCREL) {
1670 uint64_t GOTOffset = allocateGOTEntries(SectionID, 1);
1671 resolveGOTOffsetRelocation(SectionID, Offset, GOTOffset + Addend);
1673 // Fill in the value of the symbol we're targeting into the GOT
1674 RelocationEntry RE = computeGOTOffsetRE(SectionID, GOTOffset, Value.Offset, ELF::R_X86_64_64);
1675 if (Value.SymbolName)
1676 addRelocationForSymbol(RE, Value.SymbolName);
1678 addRelocationForSection(RE, Value.SectionID);
1679 } else if (RelType == ELF::R_X86_64_PC32) {
1680 Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset));
1681 processSimpleRelocation(SectionID, Offset, RelType, Value);
1682 } else if (RelType == ELF::R_X86_64_PC64) {
1683 Value.Addend += support::ulittle64_t::ref(computePlaceholderAddress(SectionID, Offset));
1684 processSimpleRelocation(SectionID, Offset, RelType, Value);
1686 processSimpleRelocation(SectionID, Offset, RelType, Value);
1689 if (Arch == Triple::x86) {
1690 Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset));
1692 processSimpleRelocation(SectionID, Offset, RelType, Value);
1697 size_t RuntimeDyldELF::getGOTEntrySize() {
1698 // We don't use the GOT in all of these cases, but it's essentially free
1699 // to put them all here.
1702 case Triple::x86_64:
1703 case Triple::aarch64:
1704 case Triple::aarch64_be:
1706 case Triple::ppc64le:
1707 case Triple::systemz:
1708 Result = sizeof(uint64_t);
1713 Result = sizeof(uint32_t);
1716 case Triple::mipsel:
1717 case Triple::mips64:
1718 case Triple::mips64el:
1720 Result = sizeof(uint32_t);
1721 else if (IsMipsN64ABI)
1722 Result = sizeof(uint64_t);
1724 llvm_unreachable("Mips ABI not handled");
1727 llvm_unreachable("Unsupported CPU type!");
1732 uint64_t RuntimeDyldELF::allocateGOTEntries(unsigned SectionID, unsigned no)
1734 (void)SectionID; // The GOT Section is the same for all section in the object file
1735 if (GOTSectionID == 0) {
1736 GOTSectionID = Sections.size();
1737 // Reserve a section id. We'll allocate the section later
1738 // once we know the total size
1739 Sections.push_back(SectionEntry(".got", nullptr, 0, 0));
1741 uint64_t StartOffset = CurrentGOTIndex * getGOTEntrySize();
1742 CurrentGOTIndex += no;
1746 void RuntimeDyldELF::resolveGOTOffsetRelocation(unsigned SectionID, uint64_t Offset, uint64_t GOTOffset)
1748 // Fill in the relative address of the GOT Entry into the stub
1749 RelocationEntry GOTRE(SectionID, Offset, ELF::R_X86_64_PC32, GOTOffset);
1750 addRelocationForSection(GOTRE, GOTSectionID);
1753 RelocationEntry RuntimeDyldELF::computeGOTOffsetRE(unsigned SectionID, uint64_t GOTOffset, uint64_t SymbolOffset,
1756 (void)SectionID; // The GOT Section is the same for all section in the object file
1757 return RelocationEntry(GOTSectionID, GOTOffset, Type, SymbolOffset);
1760 void RuntimeDyldELF::finalizeLoad(const ObjectFile &Obj,
1761 ObjSectionToIDMap &SectionMap) {
1763 if (!PendingRelocs.empty())
1764 report_fatal_error("Can't find matching LO16 reloc");
1766 // If necessary, allocate the global offset table
1767 if (GOTSectionID != 0) {
1768 // Allocate memory for the section
1769 size_t TotalSize = CurrentGOTIndex * getGOTEntrySize();
1770 uint8_t *Addr = MemMgr.allocateDataSection(TotalSize, getGOTEntrySize(),
1771 GOTSectionID, ".got", false);
1773 report_fatal_error("Unable to allocate memory for GOT!");
1775 Sections[GOTSectionID] = SectionEntry(".got", Addr, TotalSize, 0);
1778 Checker->registerSection(Obj.getFileName(), GOTSectionID);
1780 // For now, initialize all GOT entries to zero. We'll fill them in as
1781 // needed when GOT-based relocations are applied.
1782 memset(Addr, 0, TotalSize);
1784 // To correctly resolve Mips GOT relocations, we need a mapping from
1785 // object's sections to GOTs.
1786 for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
1788 if (SI->relocation_begin() != SI->relocation_end()) {
1789 section_iterator RelocatedSection = SI->getRelocatedSection();
1790 ObjSectionToIDMap::iterator i = SectionMap.find(*RelocatedSection);
1791 assert (i != SectionMap.end());
1792 SectionToGOTMap[i->second] = GOTSectionID;
1795 GOTSymbolOffsets.clear();
1799 // Look for and record the EH frame section.
1800 ObjSectionToIDMap::iterator i, e;
1801 for (i = SectionMap.begin(), e = SectionMap.end(); i != e; ++i) {
1802 const SectionRef &Section = i->first;
1804 Section.getName(Name);
1805 if (Name == ".eh_frame") {
1806 UnregisteredEHFrameSections.push_back(i->second);
1812 CurrentGOTIndex = 0;
1815 bool RuntimeDyldELF::isCompatibleFile(const object::ObjectFile &Obj) const {