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Jim Grosbach06594e12012-01-16 23:50:58 +00001//===-- RuntimeDyldELF.cpp - Run-time dynamic linker for MC-JIT -*- C++ -*-===//
Eli Bendersky4c647582012-01-16 08:56:09 +00002//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Implementation of ELF support for the MC-JIT runtime dynamic linker.
11//
12//===----------------------------------------------------------------------===//
13
Andrew Kayloradc70562012-10-02 21:18:39 +000014#include "RuntimeDyldELF.h"
Keno Fischer02628de2015-04-14 02:10:35 +000015#include "RuntimeDyldCheckerImpl.h"
Simon Dardisc97cfb62016-12-13 11:39:18 +000016#include "Targets/RuntimeDyldELFMips.h"
Eli Bendersky4c647582012-01-16 08:56:09 +000017#include "llvm/ADT/IntervalMap.h"
Chandler Carruthed0881b2012-12-03 16:50:05 +000018#include "llvm/ADT/STLExtras.h"
19#include "llvm/ADT/StringRef.h"
Eli Bendersky4c647582012-01-16 08:56:09 +000020#include "llvm/ADT/Triple.h"
Lang Hamesb5c7b1f2014-11-26 16:54:40 +000021#include "llvm/MC/MCStreamer.h"
Michael J. Spencer126973b2013-08-08 22:27:13 +000022#include "llvm/Object/ELFObjectFile.h"
Chandler Carruthed0881b2012-12-03 16:50:05 +000023#include "llvm/Object/ObjectFile.h"
24#include "llvm/Support/ELF.h"
Alexey Samsonova8d2f812014-08-27 23:06:08 +000025#include "llvm/Support/Endian.h"
Lang Hames173c69f2014-01-08 04:09:09 +000026#include "llvm/Support/MemoryBuffer.h"
Lang Hamesb5c7b1f2014-11-26 16:54:40 +000027#include "llvm/Support/TargetRegistry.h"
Lang Hames173c69f2014-01-08 04:09:09 +000028
Eli Bendersky4c647582012-01-16 08:56:09 +000029using namespace llvm;
30using namespace llvm::object;
Eugene Leviant5240a302016-12-27 13:33:32 +000031using namespace llvm::support::endian;
Eli Bendersky4c647582012-01-16 08:56:09 +000032
Chandler Carruthf58e3762014-04-22 03:04:17 +000033#define DEBUG_TYPE "dyld"
34
Eugene Leviant5240a302016-12-27 13:33:32 +000035static void or32le(void *P, int32_t V) { write32le(P, read32le(P) | V); }
36
37static void or32AArch64Imm(void *L, uint64_t Imm) {
38 or32le(L, (Imm & 0xFFF) << 10);
39}
40
41template <class T> static void write(bool isBE, void *P, T V) {
42 isBE ? write<T, support::big>(P, V) : write<T, support::little>(P, V);
43}
44
45static void write32AArch64Addr(void *L, uint64_t Imm) {
46 uint32_t ImmLo = (Imm & 0x3) << 29;
47 uint32_t ImmHi = (Imm & 0x1FFFFC) << 3;
48 uint64_t Mask = (0x3 << 29) | (0x1FFFFC << 3);
49 write32le(L, (read32le(L) & ~Mask) | ImmLo | ImmHi);
50}
51
52// Return the bits [Start, End] from Val shifted Start bits.
53// For instance, getBits(0xF0, 4, 8) returns 0xF.
54static uint64_t getBits(uint64_t Val, int Start, int End) {
55 uint64_t Mask = ((uint64_t)1 << (End + 1 - Start)) - 1;
56 return (Val >> Start) & Mask;
57}
58
Lang Hamesb5c7b1f2014-11-26 16:54:40 +000059namespace {
60
Juergen Ributzka7608dc02014-03-21 20:28:42 +000061template <class ELFT> class DyldELFObject : public ELFObjectFile<ELFT> {
Rafael Espindola035b4162013-04-17 21:20:55 +000062 LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
Preston Gurdcc31af92012-04-16 22:12:58 +000063
Michael J. Spencer1a791612013-01-15 07:44:25 +000064 typedef Elf_Shdr_Impl<ELFT> Elf_Shdr;
65 typedef Elf_Sym_Impl<ELFT> Elf_Sym;
Juergen Ributzka7608dc02014-03-21 20:28:42 +000066 typedef Elf_Rel_Impl<ELFT, false> Elf_Rel;
67 typedef Elf_Rel_Impl<ELFT, true> Elf_Rela;
Preston Gurdcc31af92012-04-16 22:12:58 +000068
Michael J. Spencer1a791612013-01-15 07:44:25 +000069 typedef Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
Preston Gurdcc31af92012-04-16 22:12:58 +000070
Juergen Ributzka7608dc02014-03-21 20:28:42 +000071 typedef typename ELFDataTypeTypedefHelper<ELFT>::value_type addr_type;
Preston Gurdcc31af92012-04-16 22:12:58 +000072
Preston Gurdcc31af92012-04-16 22:12:58 +000073public:
Rafael Espindola48af1c22014-08-19 18:44:46 +000074 DyldELFObject(MemoryBufferRef Wrapper, std::error_code &ec);
Preston Gurdcc31af92012-04-16 22:12:58 +000075
76 void updateSectionAddress(const SectionRef &Sec, uint64_t Addr);
Lang Hamesb5c7b1f2014-11-26 16:54:40 +000077
78 void updateSymbolAddress(const SymbolRef &SymRef, uint64_t Addr);
Preston Gurdcc31af92012-04-16 22:12:58 +000079
Andrew Kaylor5c010902012-07-27 17:52:42 +000080 // Methods for type inquiry through isa, cast and dyn_cast
Preston Gurdcc31af92012-04-16 22:12:58 +000081 static inline bool classof(const Binary *v) {
Juergen Ributzka7608dc02014-03-21 20:28:42 +000082 return (isa<ELFObjectFile<ELFT>>(v) &&
83 classof(cast<ELFObjectFile<ELFT>>(v)));
Preston Gurdcc31af92012-04-16 22:12:58 +000084 }
Juergen Ributzka7608dc02014-03-21 20:28:42 +000085 static inline bool classof(const ELFObjectFile<ELFT> *v) {
Preston Gurdcc31af92012-04-16 22:12:58 +000086 return v->isDyldType();
87 }
Preston Gurdcc31af92012-04-16 22:12:58 +000088};
89
Preston Gurdcc31af92012-04-16 22:12:58 +000090
Preston Gurdcc31af92012-04-16 22:12:58 +000091
Andrew Kayloradc70562012-10-02 21:18:39 +000092// The MemoryBuffer passed into this constructor is just a wrapper around the
93// actual memory. Ultimately, the Binary parent class will take ownership of
94// this MemoryBuffer object but not the underlying memory.
Juergen Ributzka7608dc02014-03-21 20:28:42 +000095template <class ELFT>
Rafael Espindola48af1c22014-08-19 18:44:46 +000096DyldELFObject<ELFT>::DyldELFObject(MemoryBufferRef Wrapper, std::error_code &EC)
97 : ELFObjectFile<ELFT>(Wrapper, EC) {
Preston Gurdcc31af92012-04-16 22:12:58 +000098 this->isDyldELFObject = true;
99}
100
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000101template <class ELFT>
Michael J. Spencer1a791612013-01-15 07:44:25 +0000102void DyldELFObject<ELFT>::updateSectionAddress(const SectionRef &Sec,
103 uint64_t Addr) {
Preston Gurdcc31af92012-04-16 22:12:58 +0000104 DataRefImpl ShdrRef = Sec.getRawDataRefImpl();
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000105 Elf_Shdr *shdr =
106 const_cast<Elf_Shdr *>(reinterpret_cast<const Elf_Shdr *>(ShdrRef.p));
Preston Gurdcc31af92012-04-16 22:12:58 +0000107
108 // This assumes the address passed in matches the target address bitness
109 // The template-based type cast handles everything else.
110 shdr->sh_addr = static_cast<addr_type>(Addr);
111}
112
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000113template <class ELFT>
Michael J. Spencer1a791612013-01-15 07:44:25 +0000114void DyldELFObject<ELFT>::updateSymbolAddress(const SymbolRef &SymRef,
115 uint64_t Addr) {
Preston Gurdcc31af92012-04-16 22:12:58 +0000116
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000117 Elf_Sym *sym = const_cast<Elf_Sym *>(
118 ELFObjectFile<ELFT>::getSymbol(SymRef.getRawDataRefImpl()));
Preston Gurdcc31af92012-04-16 22:12:58 +0000119
120 // This assumes the address passed in matches the target address bitness
121 // The template-based type cast handles everything else.
122 sym->st_value = static_cast<addr_type>(Addr);
123}
124
David Blaikie5e1ffae2015-08-05 20:20:29 +0000125class LoadedELFObjectInfo final
NAKAMURA Takumi73dc2e42015-05-22 10:11:07 +0000126 : public RuntimeDyld::LoadedObjectInfoHelper<LoadedELFObjectInfo> {
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000127public:
Lang Hames2e88f4f2015-07-28 17:52:11 +0000128 LoadedELFObjectInfo(RuntimeDyldImpl &RTDyld, ObjSectionToIDMap ObjSecToIDMap)
129 : LoadedObjectInfoHelper(RTDyld, std::move(ObjSecToIDMap)) {}
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000130
131 OwningBinary<ObjectFile>
132 getObjectForDebug(const ObjectFile &Obj) const override;
133};
134
135template <typename ELFT>
136std::unique_ptr<DyldELFObject<ELFT>>
137createRTDyldELFObject(MemoryBufferRef Buffer,
Lang Hames2e88f4f2015-07-28 17:52:11 +0000138 const ObjectFile &SourceObject,
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000139 const LoadedELFObjectInfo &L,
140 std::error_code &ec) {
141 typedef typename ELFFile<ELFT>::Elf_Shdr Elf_Shdr;
142 typedef typename ELFDataTypeTypedefHelper<ELFT>::value_type addr_type;
143
144 std::unique_ptr<DyldELFObject<ELFT>> Obj =
145 llvm::make_unique<DyldELFObject<ELFT>>(Buffer, ec);
146
147 // Iterate over all sections in the object.
Lang Hames2e88f4f2015-07-28 17:52:11 +0000148 auto SI = SourceObject.section_begin();
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000149 for (const auto &Sec : Obj->sections()) {
150 StringRef SectionName;
151 Sec.getName(SectionName);
152 if (SectionName != "") {
153 DataRefImpl ShdrRef = Sec.getRawDataRefImpl();
154 Elf_Shdr *shdr = const_cast<Elf_Shdr *>(
155 reinterpret_cast<const Elf_Shdr *>(ShdrRef.p));
156
Lang Hames2e88f4f2015-07-28 17:52:11 +0000157 if (uint64_t SecLoadAddr = L.getSectionLoadAddress(*SI)) {
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000158 // This assumes that the address passed in matches the target address
159 // bitness. The template-based type cast handles everything else.
160 shdr->sh_addr = static_cast<addr_type>(SecLoadAddr);
161 }
162 }
Lang Hames2e88f4f2015-07-28 17:52:11 +0000163 ++SI;
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000164 }
165
166 return Obj;
167}
168
169OwningBinary<ObjectFile> createELFDebugObject(const ObjectFile &Obj,
170 const LoadedELFObjectInfo &L) {
171 assert(Obj.isELF() && "Not an ELF object file.");
172
173 std::unique_ptr<MemoryBuffer> Buffer =
174 MemoryBuffer::getMemBufferCopy(Obj.getData(), Obj.getFileName());
175
176 std::error_code ec;
177
178 std::unique_ptr<ObjectFile> DebugObj;
179 if (Obj.getBytesInAddress() == 4 && Obj.isLittleEndian()) {
Rafael Espindolaac729b42015-06-02 12:05:27 +0000180 typedef ELFType<support::little, false> ELF32LE;
Lang Hames2e88f4f2015-07-28 17:52:11 +0000181 DebugObj = createRTDyldELFObject<ELF32LE>(Buffer->getMemBufferRef(), Obj, L,
182 ec);
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000183 } else if (Obj.getBytesInAddress() == 4 && !Obj.isLittleEndian()) {
Rafael Espindolaac729b42015-06-02 12:05:27 +0000184 typedef ELFType<support::big, false> ELF32BE;
Lang Hames2e88f4f2015-07-28 17:52:11 +0000185 DebugObj = createRTDyldELFObject<ELF32BE>(Buffer->getMemBufferRef(), Obj, L,
186 ec);
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000187 } else if (Obj.getBytesInAddress() == 8 && !Obj.isLittleEndian()) {
Rafael Espindolaac729b42015-06-02 12:05:27 +0000188 typedef ELFType<support::big, true> ELF64BE;
Lang Hames2e88f4f2015-07-28 17:52:11 +0000189 DebugObj = createRTDyldELFObject<ELF64BE>(Buffer->getMemBufferRef(), Obj, L,
190 ec);
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000191 } else if (Obj.getBytesInAddress() == 8 && Obj.isLittleEndian()) {
Rafael Espindolaac729b42015-06-02 12:05:27 +0000192 typedef ELFType<support::little, true> ELF64LE;
Lang Hames2e88f4f2015-07-28 17:52:11 +0000193 DebugObj = createRTDyldELFObject<ELF64LE>(Buffer->getMemBufferRef(), Obj, L,
194 ec);
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000195 } else
196 llvm_unreachable("Unexpected ELF format");
197
198 assert(!ec && "Could not construct copy ELF object file");
199
200 return OwningBinary<ObjectFile>(std::move(DebugObj), std::move(Buffer));
201}
202
203OwningBinary<ObjectFile>
204LoadedELFObjectInfo::getObjectForDebug(const ObjectFile &Obj) const {
205 return createELFDebugObject(Obj, *this);
206}
207
Hans Wennborg083ca9b2015-10-06 23:24:35 +0000208} // anonymous namespace
Preston Gurdcc31af92012-04-16 22:12:58 +0000209
Eli Bendersky4c647582012-01-16 08:56:09 +0000210namespace llvm {
211
Lang Hames633fe142015-03-30 03:37:06 +0000212RuntimeDyldELF::RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr,
Lang Hamesad4a9112016-08-01 20:49:11 +0000213 JITSymbolResolver &Resolver)
Keno Fischer02628de2015-04-14 02:10:35 +0000214 : RuntimeDyldImpl(MemMgr, Resolver), GOTSectionID(0), CurrentGOTIndex(0) {}
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000215RuntimeDyldELF::~RuntimeDyldELF() {}
216
Andrew Kaylor7bb13442013-10-11 21:25:48 +0000217void RuntimeDyldELF::registerEHFrames() {
Andrew Kaylor7bb13442013-10-11 21:25:48 +0000218 for (int i = 0, e = UnregisteredEHFrameSections.size(); i != e; ++i) {
219 SID EHFrameSID = UnregisteredEHFrameSections[i];
Sanjoy Das277776a2015-11-23 21:47:41 +0000220 uint8_t *EHFrameAddr = Sections[EHFrameSID].getAddress();
221 uint64_t EHFrameLoadAddr = Sections[EHFrameSID].getLoadAddress();
222 size_t EHFrameSize = Sections[EHFrameSID].getSize();
Lang Hames633fe142015-03-30 03:37:06 +0000223 MemMgr.registerEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
Andrew Kaylorc442a762013-10-16 00:14:21 +0000224 RegisteredEHFrameSections.push_back(EHFrameSID);
Rafael Espindolafa5942b2013-05-05 20:43:10 +0000225 }
Andrew Kaylor7bb13442013-10-11 21:25:48 +0000226 UnregisteredEHFrameSections.clear();
Rafael Espindolafa5942b2013-05-05 20:43:10 +0000227}
228
Andrew Kaylorc442a762013-10-16 00:14:21 +0000229void RuntimeDyldELF::deregisterEHFrames() {
Andrew Kaylorc442a762013-10-16 00:14:21 +0000230 for (int i = 0, e = RegisteredEHFrameSections.size(); i != e; ++i) {
231 SID EHFrameSID = RegisteredEHFrameSections[i];
Sanjoy Das277776a2015-11-23 21:47:41 +0000232 uint8_t *EHFrameAddr = Sections[EHFrameSID].getAddress();
233 uint64_t EHFrameLoadAddr = Sections[EHFrameSID].getLoadAddress();
234 size_t EHFrameSize = Sections[EHFrameSID].getSize();
Lang Hames633fe142015-03-30 03:37:06 +0000235 MemMgr.deregisterEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
Andrew Kaylorc442a762013-10-16 00:14:21 +0000236 }
237 RegisteredEHFrameSections.clear();
238}
239
Simon Dardisc97cfb62016-12-13 11:39:18 +0000240std::unique_ptr<RuntimeDyldELF>
241llvm::RuntimeDyldELF::create(Triple::ArchType Arch,
242 RuntimeDyld::MemoryManager &MemMgr,
243 JITSymbolResolver &Resolver) {
244 switch (Arch) {
245 default:
246 return make_unique<RuntimeDyldELF>(MemMgr, Resolver);
247 case Triple::mips:
248 case Triple::mipsel:
249 case Triple::mips64:
250 case Triple::mips64el:
251 return make_unique<RuntimeDyldELFMips>(MemMgr, Resolver);
252 }
253}
254
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000255std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
256RuntimeDyldELF::loadObject(const object::ObjectFile &O) {
Lang Hames89595312016-04-27 20:24:48 +0000257 if (auto ObjSectionToIDOrErr = loadObjectImpl(O))
258 return llvm::make_unique<LoadedELFObjectInfo>(*this, *ObjSectionToIDOrErr);
259 else {
260 HasError = true;
261 raw_string_ostream ErrStream(ErrorStr);
262 logAllUnhandledErrors(ObjSectionToIDOrErr.takeError(), ErrStream, "");
263 return nullptr;
264 }
Lang Hames173c69f2014-01-08 04:09:09 +0000265}
266
Andrew Kaylorfb05a502012-11-02 19:45:23 +0000267void RuntimeDyldELF::resolveX86_64Relocation(const SectionEntry &Section,
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000268 uint64_t Offset, uint64_t Value,
269 uint32_t Type, int64_t Addend,
Andrew Kaylor4612fed2013-08-19 23:27:43 +0000270 uint64_t SymOffset) {
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000271 switch (Type) {
272 default:
273 llvm_unreachable("Relocation type not implemented yet!");
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000274 break;
Will Dietzf47d26a2017-01-28 18:39:01 +0000275 case ELF::R_X86_64_NONE:
276 break;
Eli Bendersky4c647582012-01-16 08:56:09 +0000277 case ELF::R_X86_64_64: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000278 support::ulittle64_t::ref(Section.getAddressWithOffset(Offset)) =
279 Value + Addend;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000280 DEBUG(dbgs() << "Writing " << format("%p", (Value + Addend)) << " at "
Sanjoy Das277776a2015-11-23 21:47:41 +0000281 << format("%p\n", Section.getAddressWithOffset(Offset)));
Eli Bendersky4c647582012-01-16 08:56:09 +0000282 break;
283 }
284 case ELF::R_X86_64_32:
285 case ELF::R_X86_64_32S: {
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000286 Value += Addend;
Andrew Kaylor8e87a752012-07-27 20:30:12 +0000287 assert((Type == ELF::R_X86_64_32 && (Value <= UINT32_MAX)) ||
Michael J. Spencerbae14ce2013-01-04 20:36:28 +0000288 (Type == ELF::R_X86_64_32S &&
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000289 ((int64_t)Value <= INT32_MAX && (int64_t)Value >= INT32_MIN)));
Eli Bendersky4c647582012-01-16 08:56:09 +0000290 uint32_t TruncatedAddr = (Value & 0xFFFFFFFF);
Sanjoy Das277776a2015-11-23 21:47:41 +0000291 support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) =
292 TruncatedAddr;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000293 DEBUG(dbgs() << "Writing " << format("%p", TruncatedAddr) << " at "
Sanjoy Das277776a2015-11-23 21:47:41 +0000294 << format("%p\n", Section.getAddressWithOffset(Offset)));
Eli Bendersky4c647582012-01-16 08:56:09 +0000295 break;
296 }
Maksim Panchenko87ef5712015-11-08 19:34:17 +0000297 case ELF::R_X86_64_PC8: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000298 uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Maksim Panchenko87ef5712015-11-08 19:34:17 +0000299 int64_t RealOffset = Value + Addend - FinalAddress;
300 assert(isInt<8>(RealOffset));
301 int8_t TruncOffset = (RealOffset & 0xFF);
Sanjoy Das277776a2015-11-23 21:47:41 +0000302 Section.getAddress()[Offset] = TruncOffset;
Maksim Panchenko87ef5712015-11-08 19:34:17 +0000303 break;
304 }
Eli Bendersky4c647582012-01-16 08:56:09 +0000305 case ELF::R_X86_64_PC32: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000306 uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Keno Fischer02628de2015-04-14 02:10:35 +0000307 int64_t RealOffset = Value + Addend - FinalAddress;
David Majnemerdd9eafb2015-05-15 20:32:25 +0000308 assert(isInt<32>(RealOffset));
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000309 int32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
Sanjoy Das277776a2015-11-23 21:47:41 +0000310 support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) =
311 TruncOffset;
Eli Bendersky4c647582012-01-16 08:56:09 +0000312 break;
313 }
Andrew Kaylor4612fed2013-08-19 23:27:43 +0000314 case ELF::R_X86_64_PC64: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000315 uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Keno Fischer02628de2015-04-14 02:10:35 +0000316 int64_t RealOffset = Value + Addend - FinalAddress;
Sanjoy Das277776a2015-11-23 21:47:41 +0000317 support::ulittle64_t::ref(Section.getAddressWithOffset(Offset)) =
318 RealOffset;
Andrew Kaylor4612fed2013-08-19 23:27:43 +0000319 break;
320 }
Eli Bendersky4c647582012-01-16 08:56:09 +0000321 }
322}
323
Andrew Kaylorfb05a502012-11-02 19:45:23 +0000324void RuntimeDyldELF::resolveX86Relocation(const SectionEntry &Section,
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000325 uint64_t Offset, uint32_t Value,
326 uint32_t Type, int32_t Addend) {
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000327 switch (Type) {
Eli Bendersky4c647582012-01-16 08:56:09 +0000328 case ELF::R_386_32: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000329 support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) =
330 Value + Addend;
Eli Bendersky4c647582012-01-16 08:56:09 +0000331 break;
332 }
333 case ELF::R_386_PC32: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000334 uint32_t FinalAddress =
335 Section.getLoadAddressWithOffset(Offset) & 0xFFFFFFFF;
Keno Fischere6892c82015-05-01 20:21:45 +0000336 uint32_t RealOffset = Value + Addend - FinalAddress;
Sanjoy Das277776a2015-11-23 21:47:41 +0000337 support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) =
338 RealOffset;
Eli Bendersky4c647582012-01-16 08:56:09 +0000339 break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000340 }
341 default:
342 // There are other relocation types, but it appears these are the
343 // only ones currently used by the LLVM ELF object writer
344 llvm_unreachable("Relocation type not implemented yet!");
345 break;
Eli Bendersky4c647582012-01-16 08:56:09 +0000346 }
347}
348
Tim Northoverfa1b2f82013-05-04 20:13:59 +0000349void RuntimeDyldELF::resolveAArch64Relocation(const SectionEntry &Section,
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000350 uint64_t Offset, uint64_t Value,
351 uint32_t Type, int64_t Addend) {
Sanjoy Das277776a2015-11-23 21:47:41 +0000352 uint32_t *TargetPtr =
353 reinterpret_cast<uint32_t *>(Section.getAddressWithOffset(Offset));
354 uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Yichao Yu8f8cdd02016-12-15 22:36:53 +0000355 // Data should use target endian. Code should always use little endian.
356 bool isBE = Arch == Triple::aarch64_be;
Tim Northoverfa1b2f82013-05-04 20:13:59 +0000357
358 DEBUG(dbgs() << "resolveAArch64Relocation, LocalAddress: 0x"
Sanjoy Das277776a2015-11-23 21:47:41 +0000359 << format("%llx", Section.getAddressWithOffset(Offset))
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000360 << " FinalAddress: 0x" << format("%llx", FinalAddress)
361 << " Value: 0x" << format("%llx", Value) << " Type: 0x"
362 << format("%x", Type) << " Addend: 0x" << format("%llx", Addend)
Tim Northoverfa1b2f82013-05-04 20:13:59 +0000363 << "\n");
364
365 switch (Type) {
366 default:
367 llvm_unreachable("Relocation type not implemented yet!");
368 break;
Eugene Leviant5240a302016-12-27 13:33:32 +0000369 case ELF::R_AARCH64_ABS64:
370 write(isBE, TargetPtr, Value + Addend);
Tim Northoverb23d8db2013-05-04 20:14:14 +0000371 break;
Tim Northover5959ea32013-05-19 15:39:03 +0000372 case ELF::R_AARCH64_PREL32: {
Tim Northoverfa1b2f82013-05-04 20:13:59 +0000373 uint64_t Result = Value + Addend - FinalAddress;
Michael J. Spencer126973b2013-08-08 22:27:13 +0000374 assert(static_cast<int64_t>(Result) >= INT32_MIN &&
Tim Northoverfa1b2f82013-05-04 20:13:59 +0000375 static_cast<int64_t>(Result) <= UINT32_MAX);
Eugene Leviant5240a302016-12-27 13:33:32 +0000376 write(isBE, TargetPtr, static_cast<uint32_t>(Result & 0xffffffffU));
Tim Northoverfa1b2f82013-05-04 20:13:59 +0000377 break;
378 }
Eugene Leviant8e32aeb2017-01-10 11:05:30 +0000379 case ELF::R_AARCH64_PREL64:
380 write(isBE, TargetPtr, Value + Addend - FinalAddress);
381 break;
Tim Northover37cde972013-05-04 20:14:09 +0000382 case ELF::R_AARCH64_CALL26: // fallthrough
383 case ELF::R_AARCH64_JUMP26: {
384 // Operation: S+A-P. Set Call or B immediate value to bits fff_fffc of the
385 // calculation.
386 uint64_t BranchImm = Value + Addend - FinalAddress;
387
388 // "Check that -2^27 <= result < 2^27".
David Majnemerdd9eafb2015-05-15 20:32:25 +0000389 assert(isInt<28>(BranchImm));
Eugene Leviant5240a302016-12-27 13:33:32 +0000390 or32le(TargetPtr, (BranchImm & 0x0FFFFFFC) >> 2);
Tim Northover37cde972013-05-04 20:14:09 +0000391 break;
392 }
Eugene Leviant5240a302016-12-27 13:33:32 +0000393 case ELF::R_AARCH64_MOVW_UABS_G3:
394 or32le(TargetPtr, ((Value + Addend) & 0xFFFF000000000000) >> 43);
Tim Northover4d01c1e2013-05-04 20:14:04 +0000395 break;
Eugene Leviant5240a302016-12-27 13:33:32 +0000396 case ELF::R_AARCH64_MOVW_UABS_G2_NC:
397 or32le(TargetPtr, ((Value + Addend) & 0xFFFF00000000) >> 27);
Tim Northover4d01c1e2013-05-04 20:14:04 +0000398 break;
Eugene Leviant5240a302016-12-27 13:33:32 +0000399 case ELF::R_AARCH64_MOVW_UABS_G1_NC:
400 or32le(TargetPtr, ((Value + Addend) & 0xFFFF0000) >> 11);
Tim Northover4d01c1e2013-05-04 20:14:04 +0000401 break;
Eugene Leviant5240a302016-12-27 13:33:32 +0000402 case ELF::R_AARCH64_MOVW_UABS_G0_NC:
403 or32le(TargetPtr, ((Value + Addend) & 0xFFFF) << 5);
Tim Northover4d01c1e2013-05-04 20:14:04 +0000404 break;
Bradley Smith9d808492014-02-11 12:59:09 +0000405 case ELF::R_AARCH64_ADR_PREL_PG_HI21: {
406 // Operation: Page(S+A) - Page(P)
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000407 uint64_t Result =
408 ((Value + Addend) & ~0xfffULL) - (FinalAddress & ~0xfffULL);
Bradley Smith9d808492014-02-11 12:59:09 +0000409
410 // Check that -2^32 <= X < 2^32
David Majnemerdd9eafb2015-05-15 20:32:25 +0000411 assert(isInt<33>(Result) && "overflow check failed for relocation");
Bradley Smith9d808492014-02-11 12:59:09 +0000412
Bradley Smith9d808492014-02-11 12:59:09 +0000413 // Immediate goes in bits 30:29 + 5:23 of ADRP instruction, taken
414 // from bits 32:12 of X.
Eugene Leviant5240a302016-12-27 13:33:32 +0000415 write32AArch64Addr(TargetPtr, Result >> 12);
Bradley Smith9d808492014-02-11 12:59:09 +0000416 break;
417 }
Eugene Leviant5240a302016-12-27 13:33:32 +0000418 case ELF::R_AARCH64_ADD_ABS_LO12_NC:
Eugene Leviant92090832016-12-27 09:51:38 +0000419 // Operation: S + A
Eugene Leviant92090832016-12-27 09:51:38 +0000420 // Immediate goes in bits 21:10 of LD/ST instruction, taken
421 // from bits 11:0 of X
Eugene Leviant5240a302016-12-27 13:33:32 +0000422 or32AArch64Imm(TargetPtr, Value + Addend);
Eugene Leviant92090832016-12-27 09:51:38 +0000423 break;
Eugene Leviante33d2ce2017-01-23 13:13:47 +0000424 case ELF::R_AARCH64_LDST8_ABS_LO12_NC:
425 // Operation: S + A
426 // Immediate goes in bits 21:10 of LD/ST instruction, taken
427 // from bits 11:0 of X
428 or32AArch64Imm(TargetPtr, getBits(Value + Addend, 0, 11));
429 break;
430 case ELF::R_AARCH64_LDST16_ABS_LO12_NC:
431 // Operation: S + A
432 // Immediate goes in bits 21:10 of LD/ST instruction, taken
433 // from bits 11:1 of X
434 or32AArch64Imm(TargetPtr, getBits(Value + Addend, 1, 11));
435 break;
Eugene Leviant5240a302016-12-27 13:33:32 +0000436 case ELF::R_AARCH64_LDST32_ABS_LO12_NC:
Bradley Smith9d808492014-02-11 12:59:09 +0000437 // Operation: S + A
Bradley Smith9d808492014-02-11 12:59:09 +0000438 // Immediate goes in bits 21:10 of LD/ST instruction, taken
439 // from bits 11:2 of X
Eugene Leviant5240a302016-12-27 13:33:32 +0000440 or32AArch64Imm(TargetPtr, getBits(Value + Addend, 2, 11));
Bradley Smith9d808492014-02-11 12:59:09 +0000441 break;
Eugene Leviant5240a302016-12-27 13:33:32 +0000442 case ELF::R_AARCH64_LDST64_ABS_LO12_NC:
Bradley Smith9d808492014-02-11 12:59:09 +0000443 // Operation: S + A
Bradley Smith9d808492014-02-11 12:59:09 +0000444 // Immediate goes in bits 21:10 of LD/ST instruction, taken
445 // from bits 11:3 of X
Eugene Leviant5240a302016-12-27 13:33:32 +0000446 or32AArch64Imm(TargetPtr, getBits(Value + Addend, 3, 11));
Bradley Smith9d808492014-02-11 12:59:09 +0000447 break;
Eugene Leviantbeb17cc2017-01-23 13:52:08 +0000448 case ELF::R_AARCH64_LDST128_ABS_LO12_NC:
449 // Operation: S + A
450 // Immediate goes in bits 21:10 of LD/ST instruction, taken
451 // from bits 11:4 of X
452 or32AArch64Imm(TargetPtr, getBits(Value + Addend, 4, 11));
453 break;
Bradley Smith9d808492014-02-11 12:59:09 +0000454 }
Tim Northoverfa1b2f82013-05-04 20:13:59 +0000455}
456
Andrew Kaylorfb05a502012-11-02 19:45:23 +0000457void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section,
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000458 uint64_t Offset, uint32_t Value,
459 uint32_t Type, int32_t Addend) {
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000460 // TODO: Add Thumb relocations.
Sanjoy Das277776a2015-11-23 21:47:41 +0000461 uint32_t *TargetPtr =
462 reinterpret_cast<uint32_t *>(Section.getAddressWithOffset(Offset));
463 uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset) & 0xFFFFFFFF;
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000464 Value += Addend;
465
Andrew Kaylorfb05a502012-11-02 19:45:23 +0000466 DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: "
Sanjoy Das277776a2015-11-23 21:47:41 +0000467 << Section.getAddressWithOffset(Offset)
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000468 << " FinalAddress: " << format("%p", FinalAddress) << " Value: "
469 << format("%x", Value) << " Type: " << format("%x", Type)
470 << " Addend: " << format("%x", Addend) << "\n");
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000471
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000472 switch (Type) {
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000473 default:
474 llvm_unreachable("Not implemented relocation type!");
475
Renato Golin8cea6e82014-01-29 11:50:56 +0000476 case ELF::R_ARM_NONE:
477 break;
Keno Fischerc32ffe32016-10-20 21:15:29 +0000478 // Write a 31bit signed offset
Renato Golin8cea6e82014-01-29 11:50:56 +0000479 case ELF::R_ARM_PREL31:
Keno Fischerb04df8e2016-10-20 22:15:56 +0000480 support::ulittle32_t::ref{TargetPtr} =
481 (support::ulittle32_t::ref{TargetPtr} & 0x80000000) |
482 ((Value - FinalAddress) & ~0x80000000);
Keno Fischerc32ffe32016-10-20 21:15:29 +0000483 break;
Tim Northover3b684d82013-05-28 19:48:19 +0000484 case ELF::R_ARM_TARGET1:
485 case ELF::R_ARM_ABS32:
Keno Fischerb04df8e2016-10-20 22:15:56 +0000486 support::ulittle32_t::ref{TargetPtr} = Value;
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000487 break;
Keno Fischere6892c82015-05-01 20:21:45 +0000488 // Write first 16 bit of 32 bit value to the mov instruction.
489 // Last 4 bit should be shifted.
Tim Northover3b684d82013-05-28 19:48:19 +0000490 case ELF::R_ARM_MOVW_ABS_NC:
Pavel Labath3b8f3ad2015-04-16 08:58:15 +0000491 case ELF::R_ARM_MOVT_ABS:
Keno Fischere6892c82015-05-01 20:21:45 +0000492 if (Type == ELF::R_ARM_MOVW_ABS_NC)
493 Value = Value & 0xFFFF;
494 else if (Type == ELF::R_ARM_MOVT_ABS)
495 Value = (Value >> 16) & 0xFFFF;
Keno Fischerb04df8e2016-10-20 22:15:56 +0000496 support::ulittle32_t::ref{TargetPtr} =
497 (support::ulittle32_t::ref{TargetPtr} & ~0x000F0FFF) | (Value & 0xFFF) |
498 (((Value >> 12) & 0xF) << 16);
Pavel Labath3b8f3ad2015-04-16 08:58:15 +0000499 break;
Keno Fischere6892c82015-05-01 20:21:45 +0000500 // Write 24 bit relative value to the branch instruction.
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000501 case ELF::R_ARM_PC24: // Fall through.
502 case ELF::R_ARM_CALL: // Fall through.
Keno Fischere6892c82015-05-01 20:21:45 +0000503 case ELF::R_ARM_JUMP24:
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000504 int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8);
505 RelValue = (RelValue & 0x03FFFFFC) >> 2;
Keno Fischerb04df8e2016-10-20 22:15:56 +0000506 assert((support::ulittle32_t::ref{TargetPtr} & 0xFFFFFF) == 0xFFFFFE);
507 support::ulittle32_t::ref{TargetPtr} =
508 (support::ulittle32_t::ref{TargetPtr} & 0xFF000000) | RelValue;
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000509 break;
510 }
Eli Bendersky4c647582012-01-16 08:56:09 +0000511}
512
Petar Jovanovic97202832015-05-28 13:48:41 +0000513void RuntimeDyldELF::setMipsABI(const ObjectFile &Obj) {
Alexei Starovoitova38e1982015-06-10 03:06:06 +0000514 if (Arch == Triple::UnknownArch ||
515 !StringRef(Triple::getArchTypePrefix(Arch)).equals("mips")) {
Petar Jovanovic97202832015-05-28 13:48:41 +0000516 IsMipsO32ABI = false;
Simon Dardis226752c2016-10-20 13:02:23 +0000517 IsMipsN32ABI = false;
Petar Jovanovic97202832015-05-28 13:48:41 +0000518 IsMipsN64ABI = false;
519 return;
520 }
521 unsigned AbiVariant;
522 Obj.getPlatformFlags(AbiVariant);
523 IsMipsO32ABI = AbiVariant & ELF::EF_MIPS_ABI_O32;
Simon Dardis226752c2016-10-20 13:02:23 +0000524 IsMipsN32ABI = AbiVariant & ELF::EF_MIPS_ABI2;
Petar Jovanovic97202832015-05-28 13:48:41 +0000525 IsMipsN64ABI = Obj.getFileFormatName().equals("ELF64-mips");
Petar Jovanovic97202832015-05-28 13:48:41 +0000526}
527
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +0000528// Return the .TOC. section and offset.
Lang Hames89595312016-04-27 20:24:48 +0000529Error RuntimeDyldELF::findPPC64TOCSection(const ELFObjectFileBase &Obj,
530 ObjSectionToIDMap &LocalSections,
531 RelocationValueRef &Rel) {
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +0000532 // Set a default SectionID in case we do not find a TOC section below.
533 // This may happen for references to TOC base base (sym@toc, .odp
534 // relocation) without a .toc directive. In this case just use the
535 // first section (which is usually the .odp) since the code won't
536 // reference the .toc base directly.
Hans Wennborg083ca9b2015-10-06 23:24:35 +0000537 Rel.SymbolName = nullptr;
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +0000538 Rel.SectionID = 0;
539
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000540 // The TOC consists of sections .got, .toc, .tocbss, .plt in that
541 // order. The TOC starts where the first of these sections starts.
Davide Italiano2e9df172015-06-02 01:52:28 +0000542 for (auto &Section: Obj.sections()) {
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +0000543 StringRef SectionName;
Lang Hames89595312016-04-27 20:24:48 +0000544 if (auto EC = Section.getName(SectionName))
545 return errorCodeToError(EC);
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +0000546
547 if (SectionName == ".got"
548 || SectionName == ".toc"
549 || SectionName == ".tocbss"
550 || SectionName == ".plt") {
Lang Hames89595312016-04-27 20:24:48 +0000551 if (auto SectionIDOrErr =
552 findOrEmitSection(Obj, Section, false, LocalSections))
553 Rel.SectionID = *SectionIDOrErr;
554 else
555 return SectionIDOrErr.takeError();
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000556 break;
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +0000557 }
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000558 }
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +0000559
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000560 // Per the ppc64-elf-linux ABI, The TOC base is TOC value plus 0x8000
561 // thus permitting a full 64 Kbytes segment.
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +0000562 Rel.Addend = 0x8000;
Lang Hames89595312016-04-27 20:24:48 +0000563
564 return Error::success();
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000565}
566
567// Returns the sections and offset associated with the ODP entry referenced
568// by Symbol.
Lang Hames89595312016-04-27 20:24:48 +0000569Error RuntimeDyldELF::findOPDEntrySection(const ELFObjectFileBase &Obj,
570 ObjSectionToIDMap &LocalSections,
571 RelocationValueRef &Rel) {
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000572 // Get the ELF symbol value (st_value) to compare with Relocation offset in
573 // .opd entries
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000574 for (section_iterator si = Obj.section_begin(), se = Obj.section_end();
Rafael Espindola5e812af2014-01-30 02:49:50 +0000575 si != se; ++si) {
Rafael Espindolaa61f1e92013-06-03 19:37:34 +0000576 section_iterator RelSecI = si->getRelocatedSection();
Lang Hamesb5c7b1f2014-11-26 16:54:40 +0000577 if (RelSecI == Obj.section_end())
Rafael Espindolaa61f1e92013-06-03 19:37:34 +0000578 continue;
579
580 StringRef RelSectionName;
Lang Hames89595312016-04-27 20:24:48 +0000581 if (auto EC = RelSecI->getName(RelSectionName))
582 return errorCodeToError(EC);
583
Rafael Espindolaa61f1e92013-06-03 19:37:34 +0000584 if (RelSectionName != ".opd")
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000585 continue;
586
Rafael Espindola71784d62015-06-30 00:33:59 +0000587 for (elf_relocation_iterator i = si->relocation_begin(),
588 e = si->relocation_end();
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000589 i != e;) {
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000590 // The R_PPC64_ADDR64 relocation indicates the first field
591 // of a .opd entry
Rafael Espindola99c041b2015-06-30 01:53:01 +0000592 uint64_t TypeFunc = i->getType();
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000593 if (TypeFunc != ELF::R_PPC64_ADDR64) {
Rafael Espindola5e812af2014-01-30 02:49:50 +0000594 ++i;
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000595 continue;
596 }
597
Rafael Espindola96d071c2015-06-29 23:29:12 +0000598 uint64_t TargetSymbolOffset = i->getOffset();
Rafael Espindola806f0062013-06-05 01:33:53 +0000599 symbol_iterator TargetSymbol = i->getSymbol();
Lang Hames89595312016-04-27 20:24:48 +0000600 int64_t Addend;
601 if (auto AddendOrErr = i->getAddend())
602 Addend = *AddendOrErr;
603 else
604 return errorCodeToError(AddendOrErr.getError());
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000605
Rafael Espindola5e812af2014-01-30 02:49:50 +0000606 ++i;
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000607 if (i == e)
608 break;
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000609
610 // Just check if following relocation is a R_PPC64_TOC
Rafael Espindola99c041b2015-06-30 01:53:01 +0000611 uint64_t TypeTOC = i->getType();
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000612 if (TypeTOC != ELF::R_PPC64_TOC)
613 continue;
614
615 // Finally compares the Symbol value and the target symbol offset
616 // to check if this .opd entry refers to the symbol the relocation
617 // points to.
Andrew Kaylor4612fed2013-08-19 23:27:43 +0000618 if (Rel.Addend != (int64_t)TargetSymbolOffset)
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000619 continue;
620
Lang Hames89595312016-04-27 20:24:48 +0000621 section_iterator TSI = Obj.section_end();
622 if (auto TSIOrErr = TargetSymbol->getSection())
623 TSI = *TSIOrErr;
624 else
Kevin Enderby7bd8d992016-05-02 20:28:12 +0000625 return TSIOrErr.takeError();
Lang Hames89595312016-04-27 20:24:48 +0000626 assert(TSI != Obj.section_end() && "TSI should refer to a valid section");
627
628 bool IsCode = TSI->isText();
629 if (auto SectionIDOrErr = findOrEmitSection(Obj, *TSI, IsCode,
630 LocalSections))
631 Rel.SectionID = *SectionIDOrErr;
632 else
633 return SectionIDOrErr.takeError();
Rafael Espindola0d15f732013-05-09 03:39:05 +0000634 Rel.Addend = (intptr_t)Addend;
Lang Hames89595312016-04-27 20:24:48 +0000635 return Error::success();
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000636 }
637 }
638 llvm_unreachable("Attempting to get address of ODP entry!");
639}
640
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000641// Relocation masks following the #lo(value), #hi(value), #ha(value),
642// #higher(value), #highera(value), #highest(value), and #highesta(value)
643// macros defined in section 4.5.1. Relocation Types of the PPC-elf64abi
644// document.
645
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000646static inline uint16_t applyPPClo(uint64_t value) { return value & 0xffff; }
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000647
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000648static inline uint16_t applyPPChi(uint64_t value) {
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000649 return (value >> 16) & 0xffff;
650}
651
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000652static inline uint16_t applyPPCha (uint64_t value) {
653 return ((value + 0x8000) >> 16) & 0xffff;
654}
655
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000656static inline uint16_t applyPPChigher(uint64_t value) {
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000657 return (value >> 32) & 0xffff;
658}
659
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000660static inline uint16_t applyPPChighera (uint64_t value) {
661 return ((value + 0x8000) >> 32) & 0xffff;
662}
663
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000664static inline uint16_t applyPPChighest(uint64_t value) {
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000665 return (value >> 48) & 0xffff;
666}
667
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000668static inline uint16_t applyPPChighesta (uint64_t value) {
669 return ((value + 0x8000) >> 48) & 0xffff;
670}
671
Hal Finkel23cdeee2015-08-04 15:29:00 +0000672void RuntimeDyldELF::resolvePPC32Relocation(const SectionEntry &Section,
673 uint64_t Offset, uint64_t Value,
674 uint32_t Type, int64_t Addend) {
Sanjoy Das277776a2015-11-23 21:47:41 +0000675 uint8_t *LocalAddress = Section.getAddressWithOffset(Offset);
Hal Finkel23cdeee2015-08-04 15:29:00 +0000676 switch (Type) {
677 default:
678 llvm_unreachable("Relocation type not implemented yet!");
679 break;
680 case ELF::R_PPC_ADDR16_LO:
681 writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
682 break;
683 case ELF::R_PPC_ADDR16_HI:
684 writeInt16BE(LocalAddress, applyPPChi(Value + Addend));
685 break;
686 case ELF::R_PPC_ADDR16_HA:
687 writeInt16BE(LocalAddress, applyPPCha(Value + Addend));
688 break;
689 }
690}
691
Andrew Kaylorfb05a502012-11-02 19:45:23 +0000692void RuntimeDyldELF::resolvePPC64Relocation(const SectionEntry &Section,
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000693 uint64_t Offset, uint64_t Value,
694 uint32_t Type, int64_t Addend) {
Sanjoy Das277776a2015-11-23 21:47:41 +0000695 uint8_t *LocalAddress = Section.getAddressWithOffset(Offset);
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000696 switch (Type) {
697 default:
698 llvm_unreachable("Relocation type not implemented yet!");
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000699 break;
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000700 case ELF::R_PPC64_ADDR16:
701 writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
702 break;
703 case ELF::R_PPC64_ADDR16_DS:
704 writeInt16BE(LocalAddress, applyPPClo(Value + Addend) & ~3);
705 break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000706 case ELF::R_PPC64_ADDR16_LO:
707 writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000708 break;
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000709 case ELF::R_PPC64_ADDR16_LO_DS:
710 writeInt16BE(LocalAddress, applyPPClo(Value + Addend) & ~3);
711 break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000712 case ELF::R_PPC64_ADDR16_HI:
713 writeInt16BE(LocalAddress, applyPPChi(Value + Addend));
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000714 break;
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000715 case ELF::R_PPC64_ADDR16_HA:
716 writeInt16BE(LocalAddress, applyPPCha(Value + Addend));
717 break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000718 case ELF::R_PPC64_ADDR16_HIGHER:
719 writeInt16BE(LocalAddress, applyPPChigher(Value + Addend));
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000720 break;
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000721 case ELF::R_PPC64_ADDR16_HIGHERA:
722 writeInt16BE(LocalAddress, applyPPChighera(Value + Addend));
723 break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000724 case ELF::R_PPC64_ADDR16_HIGHEST:
725 writeInt16BE(LocalAddress, applyPPChighest(Value + Addend));
726 break;
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000727 case ELF::R_PPC64_ADDR16_HIGHESTA:
728 writeInt16BE(LocalAddress, applyPPChighesta(Value + Addend));
729 break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000730 case ELF::R_PPC64_ADDR14: {
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000731 assert(((Value + Addend) & 3) == 0);
732 // Preserve the AA/LK bits in the branch instruction
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000733 uint8_t aalk = *(LocalAddress + 3);
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000734 writeInt16BE(LocalAddress + 2, (aalk & 3) | ((Value + Addend) & 0xfffc));
735 } break;
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000736 case ELF::R_PPC64_REL16_LO: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000737 uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000738 uint64_t Delta = Value - FinalAddress + Addend;
739 writeInt16BE(LocalAddress, applyPPClo(Delta));
740 } break;
741 case ELF::R_PPC64_REL16_HI: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000742 uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000743 uint64_t Delta = Value - FinalAddress + Addend;
744 writeInt16BE(LocalAddress, applyPPChi(Delta));
745 } break;
746 case ELF::R_PPC64_REL16_HA: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000747 uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Ulrich Weiganddbc8e1a2014-06-20 17:51:47 +0000748 uint64_t Delta = Value - FinalAddress + Addend;
749 writeInt16BE(LocalAddress, applyPPCha(Delta));
750 } break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000751 case ELF::R_PPC64_ADDR32: {
Adhemerval Zanella9b0b7812013-01-04 19:08:13 +0000752 int32_t Result = static_cast<int32_t>(Value + Addend);
753 if (SignExtend32<32>(Result) != Result)
Adhemerval Zanella1ae22482013-01-09 17:08:15 +0000754 llvm_unreachable("Relocation R_PPC64_ADDR32 overflow");
Adhemerval Zanella9b0b7812013-01-04 19:08:13 +0000755 writeInt32BE(LocalAddress, Result);
756 } break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000757 case ELF::R_PPC64_REL24: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000758 uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000759 int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
Ulrich Weigand36b86262015-11-17 20:08:31 +0000760 if (SignExtend32<26>(delta) != delta)
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000761 llvm_unreachable("Relocation R_PPC64_REL24 overflow");
762 // Generates a 'bl <address>' instruction
763 writeInt32BE(LocalAddress, 0x48000001 | (delta & 0x03FFFFFC));
764 } break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000765 case ELF::R_PPC64_REL32: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000766 uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Adhemerval Zanella1ae22482013-01-09 17:08:15 +0000767 int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
768 if (SignExtend32<32>(delta) != delta)
769 llvm_unreachable("Relocation R_PPC64_REL32 overflow");
770 writeInt32BE(LocalAddress, delta);
771 } break;
Adhemerval Zanellae8bd03d2013-05-06 17:21:23 +0000772 case ELF::R_PPC64_REL64: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000773 uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Adhemerval Zanellae8bd03d2013-05-06 17:21:23 +0000774 uint64_t Delta = Value - FinalAddress + Addend;
775 writeInt64BE(LocalAddress, Delta);
776 } break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000777 case ELF::R_PPC64_ADDR64:
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000778 writeInt64BE(LocalAddress, Value + Addend);
779 break;
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000780 }
781}
782
Richard Sandifordca044082013-05-03 14:15:35 +0000783void RuntimeDyldELF::resolveSystemZRelocation(const SectionEntry &Section,
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000784 uint64_t Offset, uint64_t Value,
785 uint32_t Type, int64_t Addend) {
Sanjoy Das277776a2015-11-23 21:47:41 +0000786 uint8_t *LocalAddress = Section.getAddressWithOffset(Offset);
Richard Sandifordca044082013-05-03 14:15:35 +0000787 switch (Type) {
788 default:
789 llvm_unreachable("Relocation type not implemented yet!");
790 break;
791 case ELF::R_390_PC16DBL:
792 case ELF::R_390_PLT16DBL: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000793 int64_t Delta = (Value + Addend) - Section.getLoadAddressWithOffset(Offset);
Richard Sandifordca044082013-05-03 14:15:35 +0000794 assert(int16_t(Delta / 2) * 2 == Delta && "R_390_PC16DBL overflow");
795 writeInt16BE(LocalAddress, Delta / 2);
796 break;
797 }
798 case ELF::R_390_PC32DBL:
799 case ELF::R_390_PLT32DBL: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000800 int64_t Delta = (Value + Addend) - Section.getLoadAddressWithOffset(Offset);
Richard Sandifordca044082013-05-03 14:15:35 +0000801 assert(int32_t(Delta / 2) * 2 == Delta && "R_390_PC32DBL overflow");
802 writeInt32BE(LocalAddress, Delta / 2);
803 break;
804 }
805 case ELF::R_390_PC32: {
Sanjoy Das277776a2015-11-23 21:47:41 +0000806 int64_t Delta = (Value + Addend) - Section.getLoadAddressWithOffset(Offset);
Richard Sandifordca044082013-05-03 14:15:35 +0000807 assert(int32_t(Delta) == Delta && "R_390_PC32 overflow");
808 writeInt32BE(LocalAddress, Delta);
809 break;
810 }
811 case ELF::R_390_64:
812 writeInt64BE(LocalAddress, Value + Addend);
813 break;
Bryan Chand1145ad2016-05-13 17:23:48 +0000814 case ELF::R_390_PC64: {
815 int64_t Delta = (Value + Addend) - Section.getLoadAddressWithOffset(Offset);
816 writeInt64BE(LocalAddress, Delta);
817 break;
818 }
Richard Sandifordca044082013-05-03 14:15:35 +0000819 }
820}
821
Andrew Kaylor5f3a9982013-08-19 19:38:06 +0000822// The target location for the relocation is described by RE.SectionID and
823// RE.Offset. RE.SectionID can be used to find the SectionEntry. Each
824// SectionEntry has three members describing its location.
825// SectionEntry::Address is the address at which the section has been loaded
826// into memory in the current (host) process. SectionEntry::LoadAddress is the
827// address that the section will have in the target process.
828// SectionEntry::ObjAddress is the address of the bits for this section in the
829// original emitted object image (also in the current address space).
830//
831// Relocations will be applied as if the section were loaded at
832// SectionEntry::LoadAddress, but they will be applied at an address based
833// on SectionEntry::Address. SectionEntry::ObjAddress will be used to refer to
834// Target memory contents if they are required for value calculations.
835//
836// The Value parameter here is the load address of the symbol for the
837// relocation to be applied. For relocations which refer to symbols in the
838// current object Value will be the LoadAddress of the section in which
839// the symbol resides (RE.Addend provides additional information about the
840// symbol location). For external symbols, Value will be the address of the
841// symbol in the target address space.
Rafael Espindolaf1f1c622013-04-29 17:24:34 +0000842void RuntimeDyldELF::resolveRelocation(const RelocationEntry &RE,
Andrew Kaylor5f3a9982013-08-19 19:38:06 +0000843 uint64_t Value) {
Rafael Espindolaf1f1c622013-04-29 17:24:34 +0000844 const SectionEntry &Section = Sections[RE.SectionID];
Andrew Kaylor4612fed2013-08-19 23:27:43 +0000845 return resolveRelocation(Section, RE.Offset, Value, RE.RelType, RE.Addend,
Petar Jovanovic97202832015-05-28 13:48:41 +0000846 RE.SymOffset, RE.SectionID);
Rafael Espindolaf1f1c622013-04-29 17:24:34 +0000847}
848
Andrew Kaylorfb05a502012-11-02 19:45:23 +0000849void RuntimeDyldELF::resolveRelocation(const SectionEntry &Section,
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000850 uint64_t Offset, uint64_t Value,
851 uint32_t Type, int64_t Addend,
Petar Jovanovic97202832015-05-28 13:48:41 +0000852 uint64_t SymOffset, SID SectionID) {
Eli Bendersky4c647582012-01-16 08:56:09 +0000853 switch (Arch) {
854 case Triple::x86_64:
Andrew Kaylor4612fed2013-08-19 23:27:43 +0000855 resolveX86_64Relocation(Section, Offset, Value, Type, Addend, SymOffset);
Eli Bendersky4c647582012-01-16 08:56:09 +0000856 break;
857 case Triple::x86:
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000858 resolveX86Relocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type,
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000859 (uint32_t)(Addend & 0xffffffffL));
Eli Bendersky4c647582012-01-16 08:56:09 +0000860 break;
Tim Northoverfa1b2f82013-05-04 20:13:59 +0000861 case Triple::aarch64:
Christian Pirker99974c72014-03-26 14:57:32 +0000862 case Triple::aarch64_be:
Tim Northoverfa1b2f82013-05-04 20:13:59 +0000863 resolveAArch64Relocation(Section, Offset, Value, Type, Addend);
864 break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000865 case Triple::arm: // Fall through.
Christian Pirker2a111602014-03-28 14:35:30 +0000866 case Triple::armeb:
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000867 case Triple::thumb:
Christian Pirker2a111602014-03-28 14:35:30 +0000868 case Triple::thumbeb:
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000869 resolveARMRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type,
Danil Malyshev70d22cc2012-03-30 16:45:19 +0000870 (uint32_t)(Addend & 0xffffffffL));
Eli Bendersky4c647582012-01-16 08:56:09 +0000871 break;
Hal Finkel23cdeee2015-08-04 15:29:00 +0000872 case Triple::ppc:
873 resolvePPC32Relocation(Section, Offset, Value, Type, Addend);
874 break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000875 case Triple::ppc64: // Fall through.
Bill Schmidt0a9170d2013-07-26 01:35:43 +0000876 case Triple::ppc64le:
Andrew Kaylorfb05a502012-11-02 19:45:23 +0000877 resolvePPC64Relocation(Section, Offset, Value, Type, Addend);
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +0000878 break;
Richard Sandifordca044082013-05-03 14:15:35 +0000879 case Triple::systemz:
880 resolveSystemZRelocation(Section, Offset, Value, Type, Addend);
881 break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +0000882 default:
883 llvm_unreachable("Unsupported CPU type!");
Eli Bendersky4c647582012-01-16 08:56:09 +0000884 }
885}
886
Keno Fischere6892c82015-05-01 20:21:45 +0000887void *RuntimeDyldELF::computePlaceholderAddress(unsigned SectionID, uint64_t Offset) const {
Sanjoy Das277776a2015-11-23 21:47:41 +0000888 return (void *)(Sections[SectionID].getObjAddress() + Offset);
Keno Fischere6892c82015-05-01 20:21:45 +0000889}
890
891void RuntimeDyldELF::processSimpleRelocation(unsigned SectionID, uint64_t Offset, unsigned RelType, RelocationValueRef Value) {
892 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend, Value.Offset);
893 if (Value.SymbolName)
894 addRelocationForSymbol(RE, Value.SymbolName);
895 else
896 addRelocationForSection(RE, Value.SectionID);
897}
898
Petar Jovanovicd22164d2015-08-13 15:12:49 +0000899uint32_t RuntimeDyldELF::getMatchingLoRelocation(uint32_t RelType,
900 bool IsLocal) const {
901 switch (RelType) {
902 case ELF::R_MICROMIPS_GOT16:
903 if (IsLocal)
904 return ELF::R_MICROMIPS_LO16;
905 break;
906 case ELF::R_MICROMIPS_HI16:
907 return ELF::R_MICROMIPS_LO16;
908 case ELF::R_MIPS_GOT16:
909 if (IsLocal)
910 return ELF::R_MIPS_LO16;
911 break;
912 case ELF::R_MIPS_HI16:
913 return ELF::R_MIPS_LO16;
914 case ELF::R_MIPS_PCHI16:
915 return ELF::R_MIPS_PCLO16;
916 default:
917 break;
918 }
919 return ELF::R_MIPS_NONE;
920}
921
Eugene Leviantbe2d68f2017-01-09 09:56:31 +0000922// Sometimes we don't need to create thunk for a branch.
Eugene Leviante33d2ce2017-01-23 13:13:47 +0000923// This typically happens when branch target is located
Eugene Leviantbe2d68f2017-01-09 09:56:31 +0000924// in the same object file. In such case target is either
925// a weak symbol or symbol in a different executable section.
926// This function checks if branch target is located in the
927// same object file and if distance between source and target
928// fits R_AARCH64_CALL26 relocation. If both conditions are
929// met, it emits direct jump to the target and returns true.
930// Otherwise false is returned and thunk is created.
931bool RuntimeDyldELF::resolveAArch64ShortBranch(
932 unsigned SectionID, relocation_iterator RelI,
933 const RelocationValueRef &Value) {
934 uint64_t Address;
935 if (Value.SymbolName) {
936 auto Loc = GlobalSymbolTable.find(Value.SymbolName);
937
938 // Don't create direct branch for external symbols.
939 if (Loc == GlobalSymbolTable.end())
940 return false;
941
942 const auto &SymInfo = Loc->second;
Pavel Labathd3383812017-01-09 11:20:35 +0000943 Address =
944 uint64_t(Sections[SymInfo.getSectionID()].getLoadAddressWithOffset(
Eugene Leviantbe2d68f2017-01-09 09:56:31 +0000945 SymInfo.getOffset()));
946 } else {
Pavel Labathd3383812017-01-09 11:20:35 +0000947 Address = uint64_t(Sections[Value.SectionID].getLoadAddress());
Eugene Leviantbe2d68f2017-01-09 09:56:31 +0000948 }
949 uint64_t Offset = RelI->getOffset();
950 uint64_t SourceAddress = Sections[SectionID].getLoadAddressWithOffset(Offset);
951
952 // R_AARCH64_CALL26 requires immediate to be in range -2^27 <= imm < 2^27
953 // If distance between source and target is out of range then we should
954 // create thunk.
955 if (!isInt<28>(Address + Value.Addend - SourceAddress))
956 return false;
957
958 resolveRelocation(Sections[SectionID], Offset, Address, RelI->getType(),
959 Value.Addend);
960
961 return true;
962}
963
Eugene Leviant3e582c82017-02-06 15:31:28 +0000964void RuntimeDyldELF::resolveAArch64Branch(unsigned SectionID,
965 const RelocationValueRef &Value,
966 relocation_iterator RelI,
967 StubMap &Stubs) {
968
969 DEBUG(dbgs() << "\t\tThis is an AArch64 branch relocation.");
970 SectionEntry &Section = Sections[SectionID];
971
972 uint64_t Offset = RelI->getOffset();
973 unsigned RelType = RelI->getType();
974 // Look for an existing stub.
975 StubMap::const_iterator i = Stubs.find(Value);
976 if (i != Stubs.end()) {
977 resolveRelocation(Section, Offset,
978 (uint64_t)Section.getAddressWithOffset(i->second),
979 RelType, 0);
980 DEBUG(dbgs() << " Stub function found\n");
981 } else if (!resolveAArch64ShortBranch(SectionID, RelI, Value)) {
982 // Create a new stub function.
983 DEBUG(dbgs() << " Create a new stub function\n");
984 Stubs[Value] = Section.getStubOffset();
985 uint8_t *StubTargetAddr = createStubFunction(
986 Section.getAddressWithOffset(Section.getStubOffset()));
987
988 RelocationEntry REmovz_g3(SectionID, StubTargetAddr - Section.getAddress(),
989 ELF::R_AARCH64_MOVW_UABS_G3, Value.Addend);
990 RelocationEntry REmovk_g2(SectionID,
991 StubTargetAddr - Section.getAddress() + 4,
992 ELF::R_AARCH64_MOVW_UABS_G2_NC, Value.Addend);
993 RelocationEntry REmovk_g1(SectionID,
994 StubTargetAddr - Section.getAddress() + 8,
995 ELF::R_AARCH64_MOVW_UABS_G1_NC, Value.Addend);
996 RelocationEntry REmovk_g0(SectionID,
997 StubTargetAddr - Section.getAddress() + 12,
998 ELF::R_AARCH64_MOVW_UABS_G0_NC, Value.Addend);
999
1000 if (Value.SymbolName) {
1001 addRelocationForSymbol(REmovz_g3, Value.SymbolName);
1002 addRelocationForSymbol(REmovk_g2, Value.SymbolName);
1003 addRelocationForSymbol(REmovk_g1, Value.SymbolName);
1004 addRelocationForSymbol(REmovk_g0, Value.SymbolName);
1005 } else {
1006 addRelocationForSection(REmovz_g3, Value.SectionID);
1007 addRelocationForSection(REmovk_g2, Value.SectionID);
1008 addRelocationForSection(REmovk_g1, Value.SectionID);
1009 addRelocationForSection(REmovk_g0, Value.SectionID);
1010 }
1011 resolveRelocation(Section, Offset,
1012 reinterpret_cast<uint64_t>(Section.getAddressWithOffset(
1013 Section.getStubOffset())),
1014 RelType, 0);
1015 Section.advanceStubOffset(getMaxStubSize());
1016 }
1017}
1018
Lang Hames89595312016-04-27 20:24:48 +00001019Expected<relocation_iterator>
1020RuntimeDyldELF::processRelocationRef(
Rafael Espindola3dc0d052015-06-19 20:58:43 +00001021 unsigned SectionID, relocation_iterator RelI, const ObjectFile &O,
1022 ObjSectionToIDMap &ObjSectionToID, StubMap &Stubs) {
1023 const auto &Obj = cast<ELFObjectFileBase>(O);
Rafael Espindola99c041b2015-06-30 01:53:01 +00001024 uint64_t RelType = RelI->getType();
Rafael Espindola71784d62015-06-30 00:33:59 +00001025 ErrorOr<int64_t> AddendOrErr = ELFRelocationRef(*RelI).getAddend();
1026 int64_t Addend = AddendOrErr ? *AddendOrErr : 0;
Rafael Espindolaeef7ffe2015-06-26 11:39:57 +00001027 elf_symbol_iterator Symbol = RelI->getSymbol();
Eli Bendersky667b8792012-05-01 10:41:12 +00001028
1029 // Obtain the symbol name which is referenced in the relocation
1030 StringRef TargetName;
Rafael Espindola5d0c2ff2015-07-02 20:55:21 +00001031 if (Symbol != Obj.symbol_end()) {
Lang Hames89595312016-04-27 20:24:48 +00001032 if (auto TargetNameOrErr = Symbol->getName())
1033 TargetName = *TargetNameOrErr;
1034 else
1035 return TargetNameOrErr.takeError();
Rafael Espindola5d0c2ff2015-07-02 20:55:21 +00001036 }
Juergen Ributzka7608dc02014-03-21 20:28:42 +00001037 DEBUG(dbgs() << "\t\tRelType: " << RelType << " Addend: " << Addend
1038 << " TargetName: " << TargetName << "\n");
Eli Bendersky667b8792012-05-01 10:41:12 +00001039 RelocationValueRef Value;
1040 // First search for the symbol in the local symbol table
Rafael Espindola75954472013-06-05 02:55:01 +00001041 SymbolRef::Type SymType = SymbolRef::ST_Unknown;
Lang Hamesa5cd9502014-11-27 05:40:13 +00001042
1043 // Search for the symbol in the global symbol table
Lang Hames6bfd3982015-01-16 23:13:56 +00001044 RTDyldSymbolTable::const_iterator gsi = GlobalSymbolTable.end();
Lang Hamesb5c7b1f2014-11-26 16:54:40 +00001045 if (Symbol != Obj.symbol_end()) {
Lang Hamesa5cd9502014-11-27 05:40:13 +00001046 gsi = GlobalSymbolTable.find(TargetName.data());
Kevin Enderby7bd8d992016-05-02 20:28:12 +00001047 Expected<SymbolRef::Type> SymTypeOrErr = Symbol->getType();
1048 if (!SymTypeOrErr) {
1049 std::string Buf;
1050 raw_string_ostream OS(Buf);
1051 logAllUnhandledErrors(SymTypeOrErr.takeError(), OS, "");
1052 OS.flush();
1053 report_fatal_error(Buf);
1054 }
Kevin Enderby5afbc1c2016-03-23 20:27:00 +00001055 SymType = *SymTypeOrErr;
Rafael Espindola75954472013-06-05 02:55:01 +00001056 }
Lang Hamesa5cd9502014-11-27 05:40:13 +00001057 if (gsi != GlobalSymbolTable.end()) {
Lang Hames6bfd3982015-01-16 23:13:56 +00001058 const auto &SymInfo = gsi->second;
1059 Value.SectionID = SymInfo.getSectionID();
1060 Value.Offset = SymInfo.getOffset();
1061 Value.Addend = SymInfo.getOffset() + Addend;
Danil Malyshev70d22cc2012-03-30 16:45:19 +00001062 } else {
Lang Hamesa5cd9502014-11-27 05:40:13 +00001063 switch (SymType) {
1064 case SymbolRef::ST_Debug: {
1065 // TODO: Now ELF SymbolRef::ST_Debug = STT_SECTION, it's not obviously
1066 // and can be changed by another developers. Maybe best way is add
1067 // a new symbol type ST_Section to SymbolRef and use it.
Kevin Enderby7bd8d992016-05-02 20:28:12 +00001068 auto SectionOrErr = Symbol->getSection();
1069 if (!SectionOrErr) {
1070 std::string Buf;
1071 raw_string_ostream OS(Buf);
1072 logAllUnhandledErrors(SectionOrErr.takeError(), OS, "");
1073 OS.flush();
1074 report_fatal_error(Buf);
1075 }
1076 section_iterator si = *SectionOrErr;
Lang Hamesa5cd9502014-11-27 05:40:13 +00001077 if (si == Obj.section_end())
1078 llvm_unreachable("Symbol section not found, bad object file format!");
1079 DEBUG(dbgs() << "\t\tThis is section symbol\n");
1080 bool isCode = si->isText();
Lang Hames89595312016-04-27 20:24:48 +00001081 if (auto SectionIDOrErr = findOrEmitSection(Obj, (*si), isCode,
1082 ObjSectionToID))
1083 Value.SectionID = *SectionIDOrErr;
1084 else
1085 return SectionIDOrErr.takeError();
Lang Hamesa5cd9502014-11-27 05:40:13 +00001086 Value.Addend = Addend;
1087 break;
1088 }
1089 case SymbolRef::ST_Data:
Lang Hamesbb9431a2016-08-09 19:27:17 +00001090 case SymbolRef::ST_Function:
Lang Hamesa5cd9502014-11-27 05:40:13 +00001091 case SymbolRef::ST_Unknown: {
1092 Value.SymbolName = TargetName.data();
1093 Value.Addend = Addend;
Richard Mittonad6d3492013-08-16 18:54:26 +00001094
Lang Hamesa5cd9502014-11-27 05:40:13 +00001095 // Absolute relocations will have a zero symbol ID (STN_UNDEF), which
1096 // will manifest here as a NULL symbol name.
1097 // We can set this as a valid (but empty) symbol name, and rely
1098 // on addRelocationForSymbol to handle this.
1099 if (!Value.SymbolName)
1100 Value.SymbolName = "";
1101 break;
1102 }
1103 default:
1104 llvm_unreachable("Unresolved symbol type!");
1105 break;
Danil Malyshev70d22cc2012-03-30 16:45:19 +00001106 }
Eli Bendersky4c647582012-01-16 08:56:09 +00001107 }
Lang Hamesa5cd9502014-11-27 05:40:13 +00001108
Rafael Espindola96d071c2015-06-29 23:29:12 +00001109 uint64_t Offset = RelI->getOffset();
Rafael Espindola4d4a48d2013-04-29 14:44:23 +00001110
Juergen Ributzka7608dc02014-03-21 20:28:42 +00001111 DEBUG(dbgs() << "\t\tSectionID: " << SectionID << " Offset: " << Offset
Danil Malyshev70d22cc2012-03-30 16:45:19 +00001112 << "\n");
Eugene Leviant3e582c82017-02-06 15:31:28 +00001113 if ((Arch == Triple::aarch64 || Arch == Triple::aarch64_be)) {
1114 if (RelType == ELF::R_AARCH64_CALL26 || RelType == ELF::R_AARCH64_JUMP26) {
1115 resolveAArch64Branch(SectionID, Value, RelI, Stubs);
1116 } else if (RelType == ELF::R_AARCH64_ADR_GOT_PAGE) {
1117 // Craete new GOT entry or find existing one. If GOT entry is
1118 // to be created, then we also emit ABS64 relocation for it.
1119 uint64_t GOTOffset = findOrAllocGOTEntry(Value, ELF::R_AARCH64_ABS64);
1120 resolveGOTOffsetRelocation(SectionID, Offset, GOTOffset + Addend,
1121 ELF::R_AARCH64_ADR_PREL_PG_HI21);
Tim Northover37cde972013-05-04 20:14:09 +00001122
Eugene Leviant3e582c82017-02-06 15:31:28 +00001123 } else if (RelType == ELF::R_AARCH64_LD64_GOT_LO12_NC) {
1124 uint64_t GOTOffset = findOrAllocGOTEntry(Value, ELF::R_AARCH64_ABS64);
1125 resolveGOTOffsetRelocation(SectionID, Offset, GOTOffset + Addend,
1126 ELF::R_AARCH64_LDST64_ABS_LO12_NC);
1127 } else {
1128 processSimpleRelocation(SectionID, Offset, RelType, Value);
Tim Northover37cde972013-05-04 20:14:09 +00001129 }
Keno Fischere6892c82015-05-01 20:21:45 +00001130 } else if (Arch == Triple::arm) {
1131 if (RelType == ELF::R_ARM_PC24 || RelType == ELF::R_ARM_CALL ||
1132 RelType == ELF::R_ARM_JUMP24) {
1133 // This is an ARM branch relocation, need to use a stub function.
Saleem Abdulrasoolfa8c6ed2016-03-05 20:00:41 +00001134 DEBUG(dbgs() << "\t\tThis is an ARM branch relocation.\n");
Keno Fischere6892c82015-05-01 20:21:45 +00001135 SectionEntry &Section = Sections[SectionID];
Eli Bendersky4c647582012-01-16 08:56:09 +00001136
Keno Fischere6892c82015-05-01 20:21:45 +00001137 // Look for an existing stub.
1138 StubMap::const_iterator i = Stubs.find(Value);
1139 if (i != Stubs.end()) {
Sanjoy Das277776a2015-11-23 21:47:41 +00001140 resolveRelocation(
1141 Section, Offset,
1142 reinterpret_cast<uint64_t>(Section.getAddressWithOffset(i->second)),
1143 RelType, 0);
Keno Fischere6892c82015-05-01 20:21:45 +00001144 DEBUG(dbgs() << " Stub function found\n");
Pavel Labath3b8f3ad2015-04-16 08:58:15 +00001145 } else {
Keno Fischere6892c82015-05-01 20:21:45 +00001146 // Create a new stub function.
1147 DEBUG(dbgs() << " Create a new stub function\n");
Sanjoy Das277776a2015-11-23 21:47:41 +00001148 Stubs[Value] = Section.getStubOffset();
1149 uint8_t *StubTargetAddr = createStubFunction(
1150 Section.getAddressWithOffset(Section.getStubOffset()));
1151 RelocationEntry RE(SectionID, StubTargetAddr - Section.getAddress(),
1152 ELF::R_ARM_ABS32, Value.Addend);
Keno Fischere6892c82015-05-01 20:21:45 +00001153 if (Value.SymbolName)
1154 addRelocationForSymbol(RE, Value.SymbolName);
1155 else
1156 addRelocationForSection(RE, Value.SectionID);
Pavel Labath3b8f3ad2015-04-16 08:58:15 +00001157
Sanjoy Das277776a2015-11-23 21:47:41 +00001158 resolveRelocation(Section, Offset, reinterpret_cast<uint64_t>(
1159 Section.getAddressWithOffset(
1160 Section.getStubOffset())),
1161 RelType, 0);
1162 Section.advanceStubOffset(getMaxStubSize());
Keno Fischere6892c82015-05-01 20:21:45 +00001163 }
1164 } else {
1165 uint32_t *Placeholder =
1166 reinterpret_cast<uint32_t*>(computePlaceholderAddress(SectionID, Offset));
1167 if (RelType == ELF::R_ARM_PREL31 || RelType == ELF::R_ARM_TARGET1 ||
1168 RelType == ELF::R_ARM_ABS32) {
1169 Value.Addend += *Placeholder;
1170 } else if (RelType == ELF::R_ARM_MOVW_ABS_NC || RelType == ELF::R_ARM_MOVT_ABS) {
1171 // See ELF for ARM documentation
1172 Value.Addend += (int16_t)((*Placeholder & 0xFFF) | (((*Placeholder >> 16) & 0xF) << 12));
1173 }
1174 processSimpleRelocation(SectionID, Offset, RelType, Value);
1175 }
Petar Jovanovic97202832015-05-28 13:48:41 +00001176 } else if (IsMipsO32ABI) {
Daniel Sanders8b2354d2015-06-03 10:27:28 +00001177 uint8_t *Placeholder = reinterpret_cast<uint8_t *>(
1178 computePlaceholderAddress(SectionID, Offset));
1179 uint32_t Opcode = readBytesUnaligned(Placeholder, 4);
Keno Fischere6892c82015-05-01 20:21:45 +00001180 if (RelType == ELF::R_MIPS_26) {
1181 // This is an Mips branch relocation, need to use a stub function.
1182 DEBUG(dbgs() << "\t\tThis is a Mips branch relocation.");
1183 SectionEntry &Section = Sections[SectionID];
1184
1185 // Extract the addend from the instruction.
1186 // We shift up by two since the Value will be down shifted again
1187 // when applying the relocation.
Daniel Sanders8b2354d2015-06-03 10:27:28 +00001188 uint32_t Addend = (Opcode & 0x03ffffff) << 2;
Keno Fischere6892c82015-05-01 20:21:45 +00001189
1190 Value.Addend += Addend;
1191
1192 // Look up for existing stub.
1193 StubMap::const_iterator i = Stubs.find(Value);
1194 if (i != Stubs.end()) {
1195 RelocationEntry RE(SectionID, Offset, RelType, i->second);
1196 addRelocationForSection(RE, SectionID);
1197 DEBUG(dbgs() << " Stub function found\n");
1198 } else {
1199 // Create a new stub function.
1200 DEBUG(dbgs() << " Create a new stub function\n");
Sanjoy Das277776a2015-11-23 21:47:41 +00001201 Stubs[Value] = Section.getStubOffset();
Nitesh Jain7481e402016-07-15 12:56:37 +00001202
1203 unsigned AbiVariant;
1204 O.getPlatformFlags(AbiVariant);
1205
Sanjoy Das277776a2015-11-23 21:47:41 +00001206 uint8_t *StubTargetAddr = createStubFunction(
Nitesh Jain7481e402016-07-15 12:56:37 +00001207 Section.getAddressWithOffset(Section.getStubOffset()), AbiVariant);
Keno Fischere6892c82015-05-01 20:21:45 +00001208
1209 // Creating Hi and Lo relocations for the filled stub instructions.
Sanjoy Das277776a2015-11-23 21:47:41 +00001210 RelocationEntry REHi(SectionID, StubTargetAddr - Section.getAddress(),
1211 ELF::R_MIPS_HI16, Value.Addend);
1212 RelocationEntry RELo(SectionID,
Sanjoy Das990914d2015-11-24 20:37:01 +00001213 StubTargetAddr - Section.getAddress() + 4,
Sanjoy Das277776a2015-11-23 21:47:41 +00001214 ELF::R_MIPS_LO16, Value.Addend);
Keno Fischere6892c82015-05-01 20:21:45 +00001215
1216 if (Value.SymbolName) {
1217 addRelocationForSymbol(REHi, Value.SymbolName);
1218 addRelocationForSymbol(RELo, Value.SymbolName);
1219 }
1220 else {
1221 addRelocationForSection(REHi, Value.SectionID);
1222 addRelocationForSection(RELo, Value.SectionID);
1223 }
1224
Sanjoy Das277776a2015-11-23 21:47:41 +00001225 RelocationEntry RE(SectionID, Offset, RelType, Section.getStubOffset());
Keno Fischere6892c82015-05-01 20:21:45 +00001226 addRelocationForSection(RE, SectionID);
Sanjoy Das277776a2015-11-23 21:47:41 +00001227 Section.advanceStubOffset(getMaxStubSize());
Keno Fischere6892c82015-05-01 20:21:45 +00001228 }
Petar Jovanovicd22164d2015-08-13 15:12:49 +00001229 } else if (RelType == ELF::R_MIPS_HI16 || RelType == ELF::R_MIPS_PCHI16) {
1230 int64_t Addend = (Opcode & 0x0000ffff) << 16;
1231 RelocationEntry RE(SectionID, Offset, RelType, Addend);
1232 PendingRelocs.push_back(std::make_pair(Value, RE));
1233 } else if (RelType == ELF::R_MIPS_LO16 || RelType == ELF::R_MIPS_PCLO16) {
1234 int64_t Addend = Value.Addend + SignExtend32<16>(Opcode & 0x0000ffff);
1235 for (auto I = PendingRelocs.begin(); I != PendingRelocs.end();) {
1236 const RelocationValueRef &MatchingValue = I->first;
1237 RelocationEntry &Reloc = I->second;
1238 if (MatchingValue == Value &&
1239 RelType == getMatchingLoRelocation(Reloc.RelType) &&
1240 SectionID == Reloc.SectionID) {
1241 Reloc.Addend += Addend;
1242 if (Value.SymbolName)
1243 addRelocationForSymbol(Reloc, Value.SymbolName);
1244 else
1245 addRelocationForSection(Reloc, Value.SectionID);
1246 I = PendingRelocs.erase(I);
1247 } else
1248 ++I;
1249 }
1250 RelocationEntry RE(SectionID, Offset, RelType, Addend);
1251 if (Value.SymbolName)
1252 addRelocationForSymbol(RE, Value.SymbolName);
1253 else
1254 addRelocationForSection(RE, Value.SectionID);
Keno Fischere6892c82015-05-01 20:21:45 +00001255 } else {
Petar Jovanovicd22164d2015-08-13 15:12:49 +00001256 if (RelType == ELF::R_MIPS_32)
Daniel Sanders8b2354d2015-06-03 10:27:28 +00001257 Value.Addend += Opcode;
Petar Jovanovic0326a062015-07-06 12:50:55 +00001258 else if (RelType == ELF::R_MIPS_PC16)
1259 Value.Addend += SignExtend32<18>((Opcode & 0x0000ffff) << 2);
1260 else if (RelType == ELF::R_MIPS_PC19_S2)
1261 Value.Addend += SignExtend32<21>((Opcode & 0x0007ffff) << 2);
1262 else if (RelType == ELF::R_MIPS_PC21_S2)
1263 Value.Addend += SignExtend32<23>((Opcode & 0x001fffff) << 2);
1264 else if (RelType == ELF::R_MIPS_PC26_S2)
1265 Value.Addend += SignExtend32<28>((Opcode & 0x03ffffff) << 2);
Keno Fischere6892c82015-05-01 20:21:45 +00001266 processSimpleRelocation(SectionID, Offset, RelType, Value);
Akira Hatanaka111174b2012-08-17 21:28:04 +00001267 }
Simon Dardis226752c2016-10-20 13:02:23 +00001268 } else if (IsMipsN32ABI || IsMipsN64ABI) {
Petar Jovanovic97202832015-05-28 13:48:41 +00001269 uint32_t r_type = RelType & 0xff;
1270 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
1271 if (r_type == ELF::R_MIPS_CALL16 || r_type == ELF::R_MIPS_GOT_PAGE
1272 || r_type == ELF::R_MIPS_GOT_DISP) {
1273 StringMap<uint64_t>::iterator i = GOTSymbolOffsets.find(TargetName);
1274 if (i != GOTSymbolOffsets.end())
1275 RE.SymOffset = i->second;
1276 else {
Eugene Leviant3e582c82017-02-06 15:31:28 +00001277 RE.SymOffset = allocateGOTEntries(1);
Petar Jovanovic97202832015-05-28 13:48:41 +00001278 GOTSymbolOffsets[TargetName] = RE.SymOffset;
1279 }
1280 }
1281 if (Value.SymbolName)
1282 addRelocationForSymbol(RE, Value.SymbolName);
1283 else
1284 addRelocationForSection(RE, Value.SectionID);
Bill Schmidt0a9170d2013-07-26 01:35:43 +00001285 } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001286 if (RelType == ELF::R_PPC64_REL24) {
Ulrich Weigand752b5c92014-07-20 23:53:14 +00001287 // Determine ABI variant in use for this object.
1288 unsigned AbiVariant;
Lang Hamesb5c7b1f2014-11-26 16:54:40 +00001289 Obj.getPlatformFlags(AbiVariant);
Ulrich Weigand752b5c92014-07-20 23:53:14 +00001290 AbiVariant &= ELF::EF_PPC64_ABI;
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001291 // A PPC branch relocation will need a stub function if the target is
1292 // an external symbol (Symbol::ST_Unknown) or if the target address
1293 // is not within the signed 24-bits branch address.
Rafael Espindola4d4a48d2013-04-29 14:44:23 +00001294 SectionEntry &Section = Sections[SectionID];
Sanjoy Das277776a2015-11-23 21:47:41 +00001295 uint8_t *Target = Section.getAddressWithOffset(Offset);
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001296 bool RangeOverflow = false;
1297 if (SymType != SymbolRef::ST_Unknown) {
Ulrich Weigand752b5c92014-07-20 23:53:14 +00001298 if (AbiVariant != 2) {
1299 // In the ELFv1 ABI, a function call may point to the .opd entry,
1300 // so the final symbol value is calculated based on the relocation
1301 // values in the .opd section.
Lang Hamesf88174d2016-04-27 22:54:03 +00001302 if (auto Err = findOPDEntrySection(Obj, ObjSectionToID, Value))
1303 return std::move(Err);
Ulrich Weigand752b5c92014-07-20 23:53:14 +00001304 } else {
1305 // In the ELFv2 ABI, a function symbol may provide a local entry
1306 // point, which must be used for direct calls.
Rafael Espindolaeef7ffe2015-06-26 11:39:57 +00001307 uint8_t SymOther = Symbol->getOther();
Ulrich Weigand752b5c92014-07-20 23:53:14 +00001308 Value.Addend += ELF::decodePPC64LocalEntryOffset(SymOther);
1309 }
Sanjoy Das277776a2015-11-23 21:47:41 +00001310 uint8_t *RelocTarget =
1311 Sections[Value.SectionID].getAddressWithOffset(Value.Addend);
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001312 int32_t delta = static_cast<int32_t>(Target - RelocTarget);
Ulrich Weigand36b86262015-11-17 20:08:31 +00001313 // If it is within 26-bits branch range, just set the branch target
1314 if (SignExtend32<26>(delta) == delta) {
Rafael Espindola4d4a48d2013-04-29 14:44:23 +00001315 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001316 if (Value.SymbolName)
1317 addRelocationForSymbol(RE, Value.SymbolName);
1318 else
1319 addRelocationForSection(RE, Value.SectionID);
1320 } else {
1321 RangeOverflow = true;
1322 }
1323 }
David Blaikiedc3f01e2015-03-09 01:57:13 +00001324 if (SymType == SymbolRef::ST_Unknown || RangeOverflow) {
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001325 // It is an external symbol (SymbolRef::ST_Unknown) or within a range
1326 // larger than 24-bits.
1327 StubMap::const_iterator i = Stubs.find(Value);
1328 if (i != Stubs.end()) {
1329 // Symbol function stub already created, just relocate to it
Rafael Espindola4d4a48d2013-04-29 14:44:23 +00001330 resolveRelocation(Section, Offset,
Sanjoy Das277776a2015-11-23 21:47:41 +00001331 reinterpret_cast<uint64_t>(
1332 Section.getAddressWithOffset(i->second)),
1333 RelType, 0);
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001334 DEBUG(dbgs() << " Stub function found\n");
1335 } else {
1336 // Create a new stub function.
1337 DEBUG(dbgs() << " Create a new stub function\n");
Sanjoy Das277776a2015-11-23 21:47:41 +00001338 Stubs[Value] = Section.getStubOffset();
1339 uint8_t *StubTargetAddr = createStubFunction(
1340 Section.getAddressWithOffset(Section.getStubOffset()),
1341 AbiVariant);
1342 RelocationEntry RE(SectionID, StubTargetAddr - Section.getAddress(),
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001343 ELF::R_PPC64_ADDR64, Value.Addend);
1344
1345 // Generates the 64-bits address loads as exemplified in section
Ulrich Weigand32626012014-06-20 18:17:56 +00001346 // 4.5.1 in PPC64 ELF ABI. Note that the relocations need to
1347 // apply to the low part of the instructions, so we have to update
1348 // the offset according to the target endianness.
Sanjoy Das277776a2015-11-23 21:47:41 +00001349 uint64_t StubRelocOffset = StubTargetAddr - Section.getAddress();
Ulrich Weigand32626012014-06-20 18:17:56 +00001350 if (!IsTargetLittleEndian)
1351 StubRelocOffset += 2;
1352
1353 RelocationEntry REhst(SectionID, StubRelocOffset + 0,
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001354 ELF::R_PPC64_ADDR16_HIGHEST, Value.Addend);
Ulrich Weigand32626012014-06-20 18:17:56 +00001355 RelocationEntry REhr(SectionID, StubRelocOffset + 4,
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001356 ELF::R_PPC64_ADDR16_HIGHER, Value.Addend);
Ulrich Weigand32626012014-06-20 18:17:56 +00001357 RelocationEntry REh(SectionID, StubRelocOffset + 12,
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001358 ELF::R_PPC64_ADDR16_HI, Value.Addend);
Ulrich Weigand32626012014-06-20 18:17:56 +00001359 RelocationEntry REl(SectionID, StubRelocOffset + 16,
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001360 ELF::R_PPC64_ADDR16_LO, Value.Addend);
1361
1362 if (Value.SymbolName) {
1363 addRelocationForSymbol(REhst, Value.SymbolName);
Juergen Ributzka7608dc02014-03-21 20:28:42 +00001364 addRelocationForSymbol(REhr, Value.SymbolName);
1365 addRelocationForSymbol(REh, Value.SymbolName);
1366 addRelocationForSymbol(REl, Value.SymbolName);
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001367 } else {
1368 addRelocationForSection(REhst, Value.SectionID);
Juergen Ributzka7608dc02014-03-21 20:28:42 +00001369 addRelocationForSection(REhr, Value.SectionID);
1370 addRelocationForSection(REh, Value.SectionID);
1371 addRelocationForSection(REl, Value.SectionID);
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001372 }
1373
Sanjoy Das277776a2015-11-23 21:47:41 +00001374 resolveRelocation(Section, Offset, reinterpret_cast<uint64_t>(
1375 Section.getAddressWithOffset(
1376 Section.getStubOffset())),
Andrew Kaylorfb05a502012-11-02 19:45:23 +00001377 RelType, 0);
Sanjoy Das277776a2015-11-23 21:47:41 +00001378 Section.advanceStubOffset(getMaxStubSize());
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001379 }
Ulrich Weigand752b5c92014-07-20 23:53:14 +00001380 if (SymType == SymbolRef::ST_Unknown) {
Ulrich Weigandfa84ac92014-03-11 15:26:27 +00001381 // Restore the TOC for external calls
Ulrich Weigand752b5c92014-07-20 23:53:14 +00001382 if (AbiVariant == 2)
1383 writeInt32BE(Target + 4, 0xE8410018); // ld r2,28(r1)
1384 else
1385 writeInt32BE(Target + 4, 0xE8410028); // ld r2,40(r1)
1386 }
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001387 }
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +00001388 } else if (RelType == ELF::R_PPC64_TOC16 ||
1389 RelType == ELF::R_PPC64_TOC16_DS ||
1390 RelType == ELF::R_PPC64_TOC16_LO ||
1391 RelType == ELF::R_PPC64_TOC16_LO_DS ||
1392 RelType == ELF::R_PPC64_TOC16_HI ||
1393 RelType == ELF::R_PPC64_TOC16_HA) {
1394 // These relocations are supposed to subtract the TOC address from
1395 // the final value. This does not fit cleanly into the RuntimeDyld
1396 // scheme, since there may be *two* sections involved in determining
Benjamin Kramerdf005cb2015-08-08 18:27:36 +00001397 // the relocation value (the section of the symbol referred to by the
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +00001398 // relocation, and the TOC section associated with the current module).
1399 //
1400 // Fortunately, these relocations are currently only ever generated
Benjamin Kramerdf005cb2015-08-08 18:27:36 +00001401 // referring to symbols that themselves reside in the TOC, which means
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +00001402 // that the two sections are actually the same. Thus they cancel out
1403 // and we can immediately resolve the relocation right now.
1404 switch (RelType) {
1405 case ELF::R_PPC64_TOC16: RelType = ELF::R_PPC64_ADDR16; break;
1406 case ELF::R_PPC64_TOC16_DS: RelType = ELF::R_PPC64_ADDR16_DS; break;
1407 case ELF::R_PPC64_TOC16_LO: RelType = ELF::R_PPC64_ADDR16_LO; break;
1408 case ELF::R_PPC64_TOC16_LO_DS: RelType = ELF::R_PPC64_ADDR16_LO_DS; break;
1409 case ELF::R_PPC64_TOC16_HI: RelType = ELF::R_PPC64_ADDR16_HI; break;
1410 case ELF::R_PPC64_TOC16_HA: RelType = ELF::R_PPC64_ADDR16_HA; break;
1411 default: llvm_unreachable("Wrong relocation type.");
1412 }
1413
1414 RelocationValueRef TOCValue;
Lang Hames09a74c42016-04-27 20:51:58 +00001415 if (auto Err = findPPC64TOCSection(Obj, ObjSectionToID, TOCValue))
1416 return std::move(Err);
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +00001417 if (Value.SymbolName || Value.SectionID != TOCValue.SectionID)
1418 llvm_unreachable("Unsupported TOC relocation.");
1419 Value.Addend -= TOCValue.Addend;
1420 resolveRelocation(Sections[SectionID], Offset, Value.Addend, RelType, 0);
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001421 } else {
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +00001422 // There are two ways to refer to the TOC address directly: either
1423 // via a ELF::R_PPC64_TOC relocation (where both symbol and addend are
1424 // ignored), or via any relocation that refers to the magic ".TOC."
1425 // symbols (in which case the addend is respected).
1426 if (RelType == ELF::R_PPC64_TOC) {
1427 RelType = ELF::R_PPC64_ADDR64;
Lang Hames09a74c42016-04-27 20:51:58 +00001428 if (auto Err = findPPC64TOCSection(Obj, ObjSectionToID, Value))
1429 return std::move(Err);
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +00001430 } else if (TargetName == ".TOC.") {
Lang Hames09a74c42016-04-27 20:51:58 +00001431 if (auto Err = findPPC64TOCSection(Obj, ObjSectionToID, Value))
1432 return std::move(Err);
Ulrich Weigand8f1f87c2014-06-27 10:32:14 +00001433 Value.Addend += Addend;
1434 }
1435
Rafael Espindola4d4a48d2013-04-29 14:44:23 +00001436 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
Richard Mittonad6d3492013-08-16 18:54:26 +00001437
1438 if (Value.SymbolName)
Adhemerval Zanella5fc11b32012-10-25 13:13:48 +00001439 addRelocationForSymbol(RE, Value.SymbolName);
1440 else
1441 addRelocationForSection(RE, Value.SectionID);
1442 }
Richard Sandifordca044082013-05-03 14:15:35 +00001443 } else if (Arch == Triple::systemz &&
Juergen Ributzka7608dc02014-03-21 20:28:42 +00001444 (RelType == ELF::R_390_PLT32DBL || RelType == ELF::R_390_GOTENT)) {
Richard Sandifordca044082013-05-03 14:15:35 +00001445 // Create function stubs for both PLT and GOT references, regardless of
1446 // whether the GOT reference is to data or code. The stub contains the
1447 // full address of the symbol, as needed by GOT references, and the
1448 // executable part only adds an overhead of 8 bytes.
1449 //
1450 // We could try to conserve space by allocating the code and data
1451 // parts of the stub separately. However, as things stand, we allocate
1452 // a stub for every relocation, so using a GOT in JIT code should be
1453 // no less space efficient than using an explicit constant pool.
1454 DEBUG(dbgs() << "\t\tThis is a SystemZ indirect relocation.");
1455 SectionEntry &Section = Sections[SectionID];
1456
1457 // Look for an existing stub.
1458 StubMap::const_iterator i = Stubs.find(Value);
1459 uintptr_t StubAddress;
1460 if (i != Stubs.end()) {
Sanjoy Das277776a2015-11-23 21:47:41 +00001461 StubAddress = uintptr_t(Section.getAddressWithOffset(i->second));
Richard Sandifordca044082013-05-03 14:15:35 +00001462 DEBUG(dbgs() << " Stub function found\n");
1463 } else {
1464 // Create a new stub function.
1465 DEBUG(dbgs() << " Create a new stub function\n");
1466
Sanjoy Das277776a2015-11-23 21:47:41 +00001467 uintptr_t BaseAddress = uintptr_t(Section.getAddress());
Richard Sandifordca044082013-05-03 14:15:35 +00001468 uintptr_t StubAlignment = getStubAlignment();
Sanjoy Das277776a2015-11-23 21:47:41 +00001469 StubAddress =
1470 (BaseAddress + Section.getStubOffset() + StubAlignment - 1) &
1471 -StubAlignment;
Richard Sandifordca044082013-05-03 14:15:35 +00001472 unsigned StubOffset = StubAddress - BaseAddress;
1473
1474 Stubs[Value] = StubOffset;
1475 createStubFunction((uint8_t *)StubAddress);
Juergen Ributzka7608dc02014-03-21 20:28:42 +00001476 RelocationEntry RE(SectionID, StubOffset + 8, ELF::R_390_64,
Lang Hames40e200e2014-08-25 23:33:48 +00001477 Value.Offset);
Richard Sandifordca044082013-05-03 14:15:35 +00001478 if (Value.SymbolName)
1479 addRelocationForSymbol(RE, Value.SymbolName);
1480 else
1481 addRelocationForSection(RE, Value.SectionID);
Sanjoy Das277776a2015-11-23 21:47:41 +00001482 Section.advanceStubOffset(getMaxStubSize());
Richard Sandifordca044082013-05-03 14:15:35 +00001483 }
1484
1485 if (RelType == ELF::R_390_GOTENT)
Juergen Ributzka7608dc02014-03-21 20:28:42 +00001486 resolveRelocation(Section, Offset, StubAddress + 8, ELF::R_390_PC32DBL,
1487 Addend);
Richard Sandifordca044082013-05-03 14:15:35 +00001488 else
1489 resolveRelocation(Section, Offset, StubAddress, RelType, Addend);
Keno Fischere6892c82015-05-01 20:21:45 +00001490 } else if (Arch == Triple::x86_64) {
1491 if (RelType == ELF::R_X86_64_PLT32) {
1492 // The way the PLT relocations normally work is that the linker allocates
1493 // the
1494 // PLT and this relocation makes a PC-relative call into the PLT. The PLT
1495 // entry will then jump to an address provided by the GOT. On first call,
1496 // the
1497 // GOT address will point back into PLT code that resolves the symbol. After
1498 // the first call, the GOT entry points to the actual function.
1499 //
1500 // For local functions we're ignoring all of that here and just replacing
1501 // the PLT32 relocation type with PC32, which will translate the relocation
1502 // into a PC-relative call directly to the function. For external symbols we
1503 // can't be sure the function will be within 2^32 bytes of the call site, so
1504 // we need to create a stub, which calls into the GOT. This case is
1505 // equivalent to the usual PLT implementation except that we use the stub
1506 // mechanism in RuntimeDyld (which puts stubs at the end of the section)
1507 // rather than allocating a PLT section.
1508 if (Value.SymbolName) {
1509 // This is a call to an external function.
1510 // Look for an existing stub.
1511 SectionEntry &Section = Sections[SectionID];
1512 StubMap::const_iterator i = Stubs.find(Value);
1513 uintptr_t StubAddress;
1514 if (i != Stubs.end()) {
Sanjoy Das277776a2015-11-23 21:47:41 +00001515 StubAddress = uintptr_t(Section.getAddress()) + i->second;
Sanjoy Das06f9a272015-11-14 00:16:15 +00001516 DEBUG(dbgs() << " Stub function found\n");
Keno Fischere6892c82015-05-01 20:21:45 +00001517 } else {
Sanjoy Das06f9a272015-11-14 00:16:15 +00001518 // Create a new stub function (equivalent to a PLT entry).
1519 DEBUG(dbgs() << " Create a new stub function\n");
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001520
Sanjoy Das277776a2015-11-23 21:47:41 +00001521 uintptr_t BaseAddress = uintptr_t(Section.getAddress());
Sanjoy Das06f9a272015-11-14 00:16:15 +00001522 uintptr_t StubAlignment = getStubAlignment();
Sanjoy Das277776a2015-11-23 21:47:41 +00001523 StubAddress =
1524 (BaseAddress + Section.getStubOffset() + StubAlignment - 1) &
1525 -StubAlignment;
Sanjoy Das06f9a272015-11-14 00:16:15 +00001526 unsigned StubOffset = StubAddress - BaseAddress;
1527 Stubs[Value] = StubOffset;
1528 createStubFunction((uint8_t *)StubAddress);
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001529
Sanjoy Das06f9a272015-11-14 00:16:15 +00001530 // Bump our stub offset counter
Sanjoy Das277776a2015-11-23 21:47:41 +00001531 Section.advanceStubOffset(getMaxStubSize());
Keno Fischer02628de2015-04-14 02:10:35 +00001532
Sanjoy Das06f9a272015-11-14 00:16:15 +00001533 // Allocate a GOT Entry
Eugene Leviant3e582c82017-02-06 15:31:28 +00001534 uint64_t GOTOffset = allocateGOTEntries(1);
Keno Fischer02628de2015-04-14 02:10:35 +00001535
Sanjoy Das06f9a272015-11-14 00:16:15 +00001536 // The load of the GOT address has an addend of -4
Eugene Leviant3e582c82017-02-06 15:31:28 +00001537 resolveGOTOffsetRelocation(SectionID, StubOffset + 2, GOTOffset - 4,
1538 ELF::R_X86_64_PC32);
Keno Fischer02628de2015-04-14 02:10:35 +00001539
Sanjoy Das06f9a272015-11-14 00:16:15 +00001540 // Fill in the value of the symbol we're targeting into the GOT
1541 addRelocationForSymbol(
Eugene Leviant3e582c82017-02-06 15:31:28 +00001542 computeGOTOffsetRE(GOTOffset, 0, ELF::R_X86_64_64),
Sanjoy Das06f9a272015-11-14 00:16:15 +00001543 Value.SymbolName);
Keno Fischere6892c82015-05-01 20:21:45 +00001544 }
1545
1546 // Make the target call a call into the stub table.
1547 resolveRelocation(Section, Offset, StubAddress, ELF::R_X86_64_PC32,
Sanjoy Das06f9a272015-11-14 00:16:15 +00001548 Addend);
Keno Fischere6892c82015-05-01 20:21:45 +00001549 } else {
1550 RelocationEntry RE(SectionID, Offset, ELF::R_X86_64_PC32, Value.Addend,
1551 Value.Offset);
1552 addRelocationForSection(RE, Value.SectionID);
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001553 }
Davide Italianocefdf232016-04-24 01:36:37 +00001554 } else if (RelType == ELF::R_X86_64_GOTPCREL ||
1555 RelType == ELF::R_X86_64_GOTPCRELX ||
1556 RelType == ELF::R_X86_64_REX_GOTPCRELX) {
Eugene Leviant3e582c82017-02-06 15:31:28 +00001557 uint64_t GOTOffset = allocateGOTEntries(1);
1558 resolveGOTOffsetRelocation(SectionID, Offset, GOTOffset + Addend,
1559 ELF::R_X86_64_PC32);
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001560
Keno Fischere6892c82015-05-01 20:21:45 +00001561 // Fill in the value of the symbol we're targeting into the GOT
Eugene Leviant3e582c82017-02-06 15:31:28 +00001562 RelocationEntry RE =
1563 computeGOTOffsetRE(GOTOffset, Value.Offset, ELF::R_X86_64_64);
Keno Fischere6892c82015-05-01 20:21:45 +00001564 if (Value.SymbolName)
1565 addRelocationForSymbol(RE, Value.SymbolName);
1566 else
1567 addRelocationForSection(RE, Value.SectionID);
1568 } else if (RelType == ELF::R_X86_64_PC32) {
1569 Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset));
1570 processSimpleRelocation(SectionID, Offset, RelType, Value);
1571 } else if (RelType == ELF::R_X86_64_PC64) {
1572 Value.Addend += support::ulittle64_t::ref(computePlaceholderAddress(SectionID, Offset));
1573 processSimpleRelocation(SectionID, Offset, RelType, Value);
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001574 } else {
Keno Fischere6892c82015-05-01 20:21:45 +00001575 processSimpleRelocation(SectionID, Offset, RelType, Value);
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001576 }
Eli Bendersky667b8792012-05-01 10:41:12 +00001577 } else {
Keno Fischere6892c82015-05-01 20:21:45 +00001578 if (Arch == Triple::x86) {
1579 Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset));
1580 }
1581 processSimpleRelocation(SectionID, Offset, RelType, Value);
Eli Bendersky667b8792012-05-01 10:41:12 +00001582 }
Juergen Ributzka046709f2014-03-21 07:26:41 +00001583 return ++RelI;
Jim Grosbacheff0a402012-01-16 22:26:39 +00001584}
1585
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001586size_t RuntimeDyldELF::getGOTEntrySize() {
1587 // We don't use the GOT in all of these cases, but it's essentially free
1588 // to put them all here.
1589 size_t Result = 0;
1590 switch (Arch) {
1591 case Triple::x86_64:
1592 case Triple::aarch64:
James Molloybd2ffa02014-04-30 10:15:41 +00001593 case Triple::aarch64_be:
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001594 case Triple::ppc64:
1595 case Triple::ppc64le:
1596 case Triple::systemz:
1597 Result = sizeof(uint64_t);
1598 break;
1599 case Triple::x86:
1600 case Triple::arm:
1601 case Triple::thumb:
Petar Jovanovic97202832015-05-28 13:48:41 +00001602 Result = sizeof(uint32_t);
1603 break;
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001604 case Triple::mips:
1605 case Triple::mipsel:
Petar Jovanovic97202832015-05-28 13:48:41 +00001606 case Triple::mips64:
1607 case Triple::mips64el:
Simon Dardis226752c2016-10-20 13:02:23 +00001608 if (IsMipsO32ABI || IsMipsN32ABI)
Petar Jovanovic97202832015-05-28 13:48:41 +00001609 Result = sizeof(uint32_t);
1610 else if (IsMipsN64ABI)
1611 Result = sizeof(uint64_t);
1612 else
1613 llvm_unreachable("Mips ABI not handled");
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001614 break;
Juergen Ributzka7608dc02014-03-21 20:28:42 +00001615 default:
1616 llvm_unreachable("Unsupported CPU type!");
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001617 }
1618 return Result;
1619}
1620
Eugene Leviant3e582c82017-02-06 15:31:28 +00001621uint64_t RuntimeDyldELF::allocateGOTEntries(unsigned no) {
Keno Fischer02628de2015-04-14 02:10:35 +00001622 if (GOTSectionID == 0) {
1623 GOTSectionID = Sections.size();
1624 // Reserve a section id. We'll allocate the section later
1625 // once we know the total size
Sanjoy Das80825922015-11-23 21:47:46 +00001626 Sections.push_back(SectionEntry(".got", nullptr, 0, 0, 0));
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001627 }
Keno Fischer02628de2015-04-14 02:10:35 +00001628 uint64_t StartOffset = CurrentGOTIndex * getGOTEntrySize();
1629 CurrentGOTIndex += no;
1630 return StartOffset;
1631}
Andrew Kaylor480dcb32013-10-05 01:52:09 +00001632
Eugene Leviant3e582c82017-02-06 15:31:28 +00001633uint64_t RuntimeDyldELF::findOrAllocGOTEntry(const RelocationValueRef &Value,
1634 unsigned GOTRelType) {
1635 auto E = GOTOffsetMap.insert({Value, 0});
1636 if (E.second) {
1637 uint64_t GOTOffset = allocateGOTEntries(1);
1638
1639 // Create relocation for newly created GOT entry
1640 RelocationEntry RE =
1641 computeGOTOffsetRE(GOTOffset, Value.Offset, GOTRelType);
1642 if (Value.SymbolName)
1643 addRelocationForSymbol(RE, Value.SymbolName);
1644 else
1645 addRelocationForSection(RE, Value.SectionID);
1646
1647 E.first->second = GOTOffset;
1648 }
1649
1650 return E.first->second;
1651}
1652
1653void RuntimeDyldELF::resolveGOTOffsetRelocation(unsigned SectionID,
1654 uint64_t Offset,
1655 uint64_t GOTOffset,
1656 uint32_t Type) {
Keno Fischer02628de2015-04-14 02:10:35 +00001657 // Fill in the relative address of the GOT Entry into the stub
Eugene Leviant3e582c82017-02-06 15:31:28 +00001658 RelocationEntry GOTRE(SectionID, Offset, Type, GOTOffset);
Keno Fischer02628de2015-04-14 02:10:35 +00001659 addRelocationForSection(GOTRE, GOTSectionID);
1660}
1661
Eugene Leviant3e582c82017-02-06 15:31:28 +00001662RelocationEntry RuntimeDyldELF::computeGOTOffsetRE(uint64_t GOTOffset,
1663 uint64_t SymbolOffset,
1664 uint32_t Type) {
Keno Fischer02628de2015-04-14 02:10:35 +00001665 return RelocationEntry(GOTSectionID, GOTOffset, Type, SymbolOffset);
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001666}
1667
Lang Hames89595312016-04-27 20:24:48 +00001668Error RuntimeDyldELF::finalizeLoad(const ObjectFile &Obj,
Lang Hames36072da2014-05-12 21:39:59 +00001669 ObjSectionToIDMap &SectionMap) {
Petar Jovanovicd22164d2015-08-13 15:12:49 +00001670 if (IsMipsO32ABI)
1671 if (!PendingRelocs.empty())
Lang Hames89595312016-04-27 20:24:48 +00001672 return make_error<RuntimeDyldError>("Can't find matching LO16 reloc");
Petar Jovanovicd22164d2015-08-13 15:12:49 +00001673
Andrew Kaylor7bb13442013-10-11 21:25:48 +00001674 // If necessary, allocate the global offset table
Keno Fischer02628de2015-04-14 02:10:35 +00001675 if (GOTSectionID != 0) {
Lang Hames633fe142015-03-30 03:37:06 +00001676 // Allocate memory for the section
Keno Fischer02628de2015-04-14 02:10:35 +00001677 size_t TotalSize = CurrentGOTIndex * getGOTEntrySize();
Lang Hames633fe142015-03-30 03:37:06 +00001678 uint8_t *Addr = MemMgr.allocateDataSection(TotalSize, getGOTEntrySize(),
Keno Fischer02628de2015-04-14 02:10:35 +00001679 GOTSectionID, ".got", false);
Lang Hames633fe142015-03-30 03:37:06 +00001680 if (!Addr)
Lang Hames89595312016-04-27 20:24:48 +00001681 return make_error<RuntimeDyldError>("Unable to allocate memory for GOT!");
Andrew Kaylor480dcb32013-10-05 01:52:09 +00001682
Sanjoy Das80825922015-11-23 21:47:46 +00001683 Sections[GOTSectionID] =
1684 SectionEntry(".got", Addr, TotalSize, TotalSize, 0);
Keno Fischer02628de2015-04-14 02:10:35 +00001685
1686 if (Checker)
1687 Checker->registerSection(Obj.getFileName(), GOTSectionID);
1688
Lang Hames633fe142015-03-30 03:37:06 +00001689 // For now, initialize all GOT entries to zero. We'll fill them in as
1690 // needed when GOT-based relocations are applied.
1691 memset(Addr, 0, TotalSize);
Simon Dardis226752c2016-10-20 13:02:23 +00001692 if (IsMipsN32ABI || IsMipsN64ABI) {
Petar Jovanovic97202832015-05-28 13:48:41 +00001693 // To correctly resolve Mips GOT relocations, we need a mapping from
1694 // object's sections to GOTs.
1695 for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
1696 SI != SE; ++SI) {
1697 if (SI->relocation_begin() != SI->relocation_end()) {
1698 section_iterator RelocatedSection = SI->getRelocatedSection();
1699 ObjSectionToIDMap::iterator i = SectionMap.find(*RelocatedSection);
1700 assert (i != SectionMap.end());
1701 SectionToGOTMap[i->second] = GOTSectionID;
1702 }
1703 }
1704 GOTSymbolOffsets.clear();
1705 }
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001706 }
Andrew Kaylor7bb13442013-10-11 21:25:48 +00001707
1708 // Look for and record the EH frame section.
1709 ObjSectionToIDMap::iterator i, e;
1710 for (i = SectionMap.begin(), e = SectionMap.end(); i != e; ++i) {
1711 const SectionRef &Section = i->first;
1712 StringRef Name;
1713 Section.getName(Name);
1714 if (Name == ".eh_frame") {
1715 UnregisteredEHFrameSections.push_back(i->second);
1716 break;
1717 }
1718 }
Keno Fischer02628de2015-04-14 02:10:35 +00001719
1720 GOTSectionID = 0;
1721 CurrentGOTIndex = 0;
Lang Hames89595312016-04-27 20:24:48 +00001722
1723 return Error::success();
Andrew Kaylor4612fed2013-08-19 23:27:43 +00001724}
1725
Lang Hamesb5c7b1f2014-11-26 16:54:40 +00001726bool RuntimeDyldELF::isCompatibleFile(const object::ObjectFile &Obj) const {
1727 return Obj.isELF();
Lang Hames173c69f2014-01-08 04:09:09 +00001728}
1729
Eugene Leviant3e582c82017-02-06 15:31:28 +00001730bool RuntimeDyldELF::relocationNeedsGot(const RelocationRef &R) const {
1731 unsigned RelTy = R.getType();
1732 if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be)
1733 return RelTy == ELF::R_AARCH64_ADR_GOT_PAGE ||
1734 RelTy == ELF::R_AARCH64_LD64_GOT_LO12_NC;
1735
1736 if (Arch == Triple::x86_64)
1737 return RelTy == ELF::R_X86_64_GOTPCREL ||
1738 RelTy == ELF::R_X86_64_GOTPCRELX ||
1739 RelTy == ELF::R_X86_64_REX_GOTPCRELX;
1740 return false;
1741}
1742
Sanjoy Dasd5658b02015-11-23 21:47:51 +00001743bool RuntimeDyldELF::relocationNeedsStub(const RelocationRef &R) const {
1744 if (Arch != Triple::x86_64)
1745 return true; // Conservative answer
1746
1747 switch (R.getType()) {
1748 default:
1749 return true; // Conservative answer
1750
1751
1752 case ELF::R_X86_64_GOTPCREL:
Davide Italianocefdf232016-04-24 01:36:37 +00001753 case ELF::R_X86_64_GOTPCRELX:
1754 case ELF::R_X86_64_REX_GOTPCRELX:
Sanjoy Dasd5658b02015-11-23 21:47:51 +00001755 case ELF::R_X86_64_PC32:
1756 case ELF::R_X86_64_PC64:
1757 case ELF::R_X86_64_64:
1758 // We know that these reloation types won't need a stub function. This list
1759 // can be extended as needed.
1760 return false;
1761 }
1762}
1763
Eli Bendersky4c647582012-01-16 08:56:09 +00001764} // namespace llvm