1 //===-- RuntimeDyldELF.cpp - Run-time dynamic linker for MC-JIT -*- C++ -*-===// 2 // 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 14 #define DEBUG_TYPE "dyld" 15 #include "RuntimeDyldELF.h" 16 #include "JITRegistrar.h" 17 #include "ObjectImageCommon.h" 18 #include "llvm/ADT/IntervalMap.h" 19 #include "llvm/ADT/OwningPtr.h" 20 #include "llvm/ADT/STLExtras.h" 21 #include "llvm/ADT/StringRef.h" 22 #include "llvm/ADT/Triple.h" 23 #include "llvm/ExecutionEngine/ObjectBuffer.h" 24 #include "llvm/ExecutionEngine/ObjectImage.h" 25 #include "llvm/Object/ELFObjectFile.h" 26 #include "llvm/Object/ObjectFile.h" 27 #include "llvm/Support/ELF.h" 28 using namespace llvm; 29 using namespace llvm::object; 30 31 namespace { 32 33 static inline 34 error_code check(error_code Err) { 35 if (Err) { 36 report_fatal_error(Err.message()); 37 } 38 return Err; 39 } 40 41 template<class ELFT> 42 class DyldELFObject 43 : public ELFObjectFile<ELFT> { 44 LLVM_ELF_IMPORT_TYPES_ELFT(ELFT) 45 46 typedef Elf_Shdr_Impl<ELFT> Elf_Shdr; 47 typedef Elf_Sym_Impl<ELFT> Elf_Sym; 48 typedef 49 Elf_Rel_Impl<ELFT, false> Elf_Rel; 50 typedef 51 Elf_Rel_Impl<ELFT, true> Elf_Rela; 52 53 typedef Elf_Ehdr_Impl<ELFT> Elf_Ehdr; 54 55 typedef typename ELFDataTypeTypedefHelper< 56 ELFT>::value_type addr_type; 57 58 public: 59 DyldELFObject(MemoryBuffer *Wrapper, error_code &ec); 60 61 void updateSectionAddress(const SectionRef &Sec, uint64_t Addr); 62 void updateSymbolAddress(const SymbolRef &Sym, uint64_t Addr); 63 64 // Methods for type inquiry through isa, cast and dyn_cast 65 static inline bool classof(const Binary *v) { 66 return (isa<ELFObjectFile<ELFT> >(v) 67 && classof(cast<ELFObjectFile 68 <ELFT> >(v))); 69 } 70 static inline bool classof( 71 const ELFObjectFile<ELFT> *v) { 72 return v->isDyldType(); 73 } 74 }; 75 76 template<class ELFT> 77 class ELFObjectImage : public ObjectImageCommon { 78 protected: 79 DyldELFObject<ELFT> *DyldObj; 80 bool Registered; 81 82 public: 83 ELFObjectImage(ObjectBuffer *Input, 84 DyldELFObject<ELFT> *Obj) 85 : ObjectImageCommon(Input, Obj), 86 DyldObj(Obj), 87 Registered(false) {} 88 89 virtual ~ELFObjectImage() { 90 if (Registered) 91 deregisterWithDebugger(); 92 } 93 94 // Subclasses can override these methods to update the image with loaded 95 // addresses for sections and common symbols 96 virtual void updateSectionAddress(const SectionRef &Sec, uint64_t Addr) 97 { 98 DyldObj->updateSectionAddress(Sec, Addr); 99 } 100 101 virtual void updateSymbolAddress(const SymbolRef &Sym, uint64_t Addr) 102 { 103 DyldObj->updateSymbolAddress(Sym, Addr); 104 } 105 106 virtual void registerWithDebugger() 107 { 108 JITRegistrar::getGDBRegistrar().registerObject(*Buffer); 109 Registered = true; 110 } 111 virtual void deregisterWithDebugger() 112 { 113 JITRegistrar::getGDBRegistrar().deregisterObject(*Buffer); 114 } 115 }; 116 117 // The MemoryBuffer passed into this constructor is just a wrapper around the 118 // actual memory. Ultimately, the Binary parent class will take ownership of 119 // this MemoryBuffer object but not the underlying memory. 120 template<class ELFT> 121 DyldELFObject<ELFT>::DyldELFObject(MemoryBuffer *Wrapper, error_code &ec) 122 : ELFObjectFile<ELFT>(Wrapper, ec) { 123 this->isDyldELFObject = true; 124 } 125 126 template<class ELFT> 127 void DyldELFObject<ELFT>::updateSectionAddress(const SectionRef &Sec, 128 uint64_t Addr) { 129 DataRefImpl ShdrRef = Sec.getRawDataRefImpl(); 130 Elf_Shdr *shdr = const_cast<Elf_Shdr*>( 131 reinterpret_cast<const Elf_Shdr *>(ShdrRef.p)); 132 133 // This assumes the address passed in matches the target address bitness 134 // The template-based type cast handles everything else. 135 shdr->sh_addr = static_cast<addr_type>(Addr); 136 } 137 138 template<class ELFT> 139 void DyldELFObject<ELFT>::updateSymbolAddress(const SymbolRef &SymRef, 140 uint64_t Addr) { 141 142 Elf_Sym *sym = const_cast<Elf_Sym*>( 143 ELFObjectFile<ELFT>::getSymbol(SymRef.getRawDataRefImpl())); 144 145 // This assumes the address passed in matches the target address bitness 146 // The template-based type cast handles everything else. 147 sym->st_value = static_cast<addr_type>(Addr); 148 } 149 150 } // namespace 151 152 namespace llvm { 153 154 StringRef RuntimeDyldELF::getEHFrameSection() { 155 for (int i = 0, e = Sections.size(); i != e; ++i) { 156 if (Sections[i].Name == ".eh_frame") 157 return StringRef((const char*)Sections[i].Address, Sections[i].Size); 158 } 159 return StringRef(); 160 } 161 162 ObjectImage *RuntimeDyldELF::createObjectImage(ObjectBuffer *Buffer) { 163 if (Buffer->getBufferSize() < ELF::EI_NIDENT) 164 llvm_unreachable("Unexpected ELF object size"); 165 std::pair<unsigned char, unsigned char> Ident = std::make_pair( 166 (uint8_t)Buffer->getBufferStart()[ELF::EI_CLASS], 167 (uint8_t)Buffer->getBufferStart()[ELF::EI_DATA]); 168 error_code ec; 169 170 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) { 171 DyldELFObject<ELFType<support::little, 4, false> > *Obj = 172 new DyldELFObject<ELFType<support::little, 4, false> >( 173 Buffer->getMemBuffer(), ec); 174 return new ELFObjectImage<ELFType<support::little, 4, false> >(Buffer, Obj); 175 } 176 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) { 177 DyldELFObject<ELFType<support::big, 4, false> > *Obj = 178 new DyldELFObject<ELFType<support::big, 4, false> >( 179 Buffer->getMemBuffer(), ec); 180 return new ELFObjectImage<ELFType<support::big, 4, false> >(Buffer, Obj); 181 } 182 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) { 183 DyldELFObject<ELFType<support::big, 8, true> > *Obj = 184 new DyldELFObject<ELFType<support::big, 8, true> >( 185 Buffer->getMemBuffer(), ec); 186 return new ELFObjectImage<ELFType<support::big, 8, true> >(Buffer, Obj); 187 } 188 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) { 189 DyldELFObject<ELFType<support::little, 8, true> > *Obj = 190 new DyldELFObject<ELFType<support::little, 8, true> >( 191 Buffer->getMemBuffer(), ec); 192 return new ELFObjectImage<ELFType<support::little, 8, true> >(Buffer, Obj); 193 } 194 else 195 llvm_unreachable("Unexpected ELF format"); 196 } 197 198 RuntimeDyldELF::~RuntimeDyldELF() { 199 } 200 201 void RuntimeDyldELF::resolveX86_64Relocation(const SectionEntry &Section, 202 uint64_t Offset, 203 uint64_t Value, 204 uint32_t Type, 205 int64_t Addend) { 206 switch (Type) { 207 default: 208 llvm_unreachable("Relocation type not implemented yet!"); 209 break; 210 case ELF::R_X86_64_64: { 211 uint64_t *Target = reinterpret_cast<uint64_t*>(Section.Address + Offset); 212 *Target = Value + Addend; 213 DEBUG(dbgs() << "Writing " << format("%p", (Value + Addend)) 214 << " at " << format("%p\n",Target)); 215 break; 216 } 217 case ELF::R_X86_64_32: 218 case ELF::R_X86_64_32S: { 219 Value += Addend; 220 assert((Type == ELF::R_X86_64_32 && (Value <= UINT32_MAX)) || 221 (Type == ELF::R_X86_64_32S && 222 ((int64_t)Value <= INT32_MAX && (int64_t)Value >= INT32_MIN))); 223 uint32_t TruncatedAddr = (Value & 0xFFFFFFFF); 224 uint32_t *Target = reinterpret_cast<uint32_t*>(Section.Address + Offset); 225 *Target = TruncatedAddr; 226 DEBUG(dbgs() << "Writing " << format("%p", TruncatedAddr) 227 << " at " << format("%p\n",Target)); 228 break; 229 } 230 case ELF::R_X86_64_PC32: { 231 // Get the placeholder value from the generated object since 232 // a previous relocation attempt may have overwritten the loaded version 233 uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress 234 + Offset); 235 uint32_t *Target = reinterpret_cast<uint32_t*>(Section.Address + Offset); 236 uint64_t FinalAddress = Section.LoadAddress + Offset; 237 int64_t RealOffset = *Placeholder + Value + Addend - FinalAddress; 238 assert(RealOffset <= INT32_MAX && RealOffset >= INT32_MIN); 239 int32_t TruncOffset = (RealOffset & 0xFFFFFFFF); 240 *Target = TruncOffset; 241 break; 242 } 243 } 244 } 245 246 void RuntimeDyldELF::resolveX86Relocation(const SectionEntry &Section, 247 uint64_t Offset, 248 uint32_t Value, 249 uint32_t Type, 250 int32_t Addend) { 251 switch (Type) { 252 case ELF::R_386_32: { 253 // Get the placeholder value from the generated object since 254 // a previous relocation attempt may have overwritten the loaded version 255 uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress 256 + Offset); 257 uint32_t *Target = reinterpret_cast<uint32_t*>(Section.Address + Offset); 258 *Target = *Placeholder + Value + Addend; 259 break; 260 } 261 case ELF::R_386_PC32: { 262 // Get the placeholder value from the generated object since 263 // a previous relocation attempt may have overwritten the loaded version 264 uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress 265 + Offset); 266 uint32_t *Target = reinterpret_cast<uint32_t*>(Section.Address + Offset); 267 uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF); 268 uint32_t RealOffset = *Placeholder + Value + Addend - FinalAddress; 269 *Target = RealOffset; 270 break; 271 } 272 default: 273 // There are other relocation types, but it appears these are the 274 // only ones currently used by the LLVM ELF object writer 275 llvm_unreachable("Relocation type not implemented yet!"); 276 break; 277 } 278 } 279 280 void RuntimeDyldELF::resolveAArch64Relocation(const SectionEntry &Section, 281 uint64_t Offset, 282 uint64_t Value, 283 uint32_t Type, 284 int64_t Addend) { 285 uint32_t *TargetPtr = reinterpret_cast<uint32_t*>(Section.Address + Offset); 286 uint64_t FinalAddress = Section.LoadAddress + Offset; 287 288 DEBUG(dbgs() << "resolveAArch64Relocation, LocalAddress: 0x" 289 << format("%llx", Section.Address + Offset) 290 << " FinalAddress: 0x" << format("%llx",FinalAddress) 291 << " Value: 0x" << format("%llx",Value) 292 << " Type: 0x" << format("%x",Type) 293 << " Addend: 0x" << format("%llx",Addend) 294 << "\n"); 295 296 switch (Type) { 297 default: 298 llvm_unreachable("Relocation type not implemented yet!"); 299 break; 300 case ELF::R_AARCH64_ABS64: { 301 uint64_t *TargetPtr = reinterpret_cast<uint64_t*>(Section.Address + Offset); 302 *TargetPtr = Value + Addend; 303 break; 304 } 305 case ELF::R_AARCH64_PREL32: { 306 uint64_t Result = Value + Addend - FinalAddress; 307 assert(static_cast<int64_t>(Result) >= INT32_MIN && 308 static_cast<int64_t>(Result) <= UINT32_MAX); 309 *TargetPtr = static_cast<uint32_t>(Result & 0xffffffffU); 310 break; 311 } 312 case ELF::R_AARCH64_CALL26: // fallthrough 313 case ELF::R_AARCH64_JUMP26: { 314 // Operation: S+A-P. Set Call or B immediate value to bits fff_fffc of the 315 // calculation. 316 uint64_t BranchImm = Value + Addend - FinalAddress; 317 318 // "Check that -2^27 <= result < 2^27". 319 assert(-(1LL << 27) <= static_cast<int64_t>(BranchImm) && 320 static_cast<int64_t>(BranchImm) < (1LL << 27)); 321 322 // AArch64 code is emitted with .rela relocations. The data already in any 323 // bits affected by the relocation on entry is garbage. 324 *TargetPtr &= 0xfc000000U; 325 // Immediate goes in bits 25:0 of B and BL. 326 *TargetPtr |= static_cast<uint32_t>(BranchImm & 0xffffffcU) >> 2; 327 break; 328 } 329 case ELF::R_AARCH64_MOVW_UABS_G3: { 330 uint64_t Result = Value + Addend; 331 332 // AArch64 code is emitted with .rela relocations. The data already in any 333 // bits affected by the relocation on entry is garbage. 334 *TargetPtr &= 0xffe0001fU; 335 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction 336 *TargetPtr |= Result >> (48 - 5); 337 // Shift must be "lsl #48", in bits 22:21 338 assert((*TargetPtr >> 21 & 0x3) == 3 && "invalid shift for relocation"); 339 break; 340 } 341 case ELF::R_AARCH64_MOVW_UABS_G2_NC: { 342 uint64_t Result = Value + Addend; 343 344 // AArch64 code is emitted with .rela relocations. The data already in any 345 // bits affected by the relocation on entry is garbage. 346 *TargetPtr &= 0xffe0001fU; 347 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction 348 *TargetPtr |= ((Result & 0xffff00000000ULL) >> (32 - 5)); 349 // Shift must be "lsl #32", in bits 22:21 350 assert((*TargetPtr >> 21 & 0x3) == 2 && "invalid shift for relocation"); 351 break; 352 } 353 case ELF::R_AARCH64_MOVW_UABS_G1_NC: { 354 uint64_t Result = Value + Addend; 355 356 // AArch64 code is emitted with .rela relocations. The data already in any 357 // bits affected by the relocation on entry is garbage. 358 *TargetPtr &= 0xffe0001fU; 359 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction 360 *TargetPtr |= ((Result & 0xffff0000U) >> (16 - 5)); 361 // Shift must be "lsl #16", in bits 22:2 362 assert((*TargetPtr >> 21 & 0x3) == 1 && "invalid shift for relocation"); 363 break; 364 } 365 case ELF::R_AARCH64_MOVW_UABS_G0_NC: { 366 uint64_t Result = Value + Addend; 367 368 // AArch64 code is emitted with .rela relocations. The data already in any 369 // bits affected by the relocation on entry is garbage. 370 *TargetPtr &= 0xffe0001fU; 371 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction 372 *TargetPtr |= ((Result & 0xffffU) << 5); 373 // Shift must be "lsl #0", in bits 22:21. 374 assert((*TargetPtr >> 21 & 0x3) == 0 && "invalid shift for relocation"); 375 break; 376 } 377 } 378 } 379 380 void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section, 381 uint64_t Offset, 382 uint32_t Value, 383 uint32_t Type, 384 int32_t Addend) { 385 // TODO: Add Thumb relocations. 386 uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress + 387 Offset); 388 uint32_t* TargetPtr = (uint32_t*)(Section.Address + Offset); 389 uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF); 390 Value += Addend; 391 392 DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: " 393 << Section.Address + Offset 394 << " FinalAddress: " << format("%p",FinalAddress) 395 << " Value: " << format("%x",Value) 396 << " Type: " << format("%x",Type) 397 << " Addend: " << format("%x",Addend) 398 << "\n"); 399 400 switch(Type) { 401 default: 402 llvm_unreachable("Not implemented relocation type!"); 403 404 // Write a 32bit value to relocation address, taking into account the 405 // implicit addend encoded in the target. 406 case ELF::R_ARM_TARGET1: 407 case ELF::R_ARM_ABS32: 408 *TargetPtr = *Placeholder + Value; 409 break; 410 // Write first 16 bit of 32 bit value to the mov instruction. 411 // Last 4 bit should be shifted. 412 case ELF::R_ARM_MOVW_ABS_NC: 413 // We are not expecting any other addend in the relocation address. 414 // Using 0x000F0FFF because MOVW has its 16 bit immediate split into 2 415 // non-contiguous fields. 416 assert((*Placeholder & 0x000F0FFF) == 0); 417 Value = Value & 0xFFFF; 418 *TargetPtr = *Placeholder | (Value & 0xFFF); 419 *TargetPtr |= ((Value >> 12) & 0xF) << 16; 420 break; 421 // Write last 16 bit of 32 bit value to the mov instruction. 422 // Last 4 bit should be shifted. 423 case ELF::R_ARM_MOVT_ABS: 424 // We are not expecting any other addend in the relocation address. 425 // Use 0x000F0FFF for the same reason as R_ARM_MOVW_ABS_NC. 426 assert((*Placeholder & 0x000F0FFF) == 0); 427 428 Value = (Value >> 16) & 0xFFFF; 429 *TargetPtr = *Placeholder | (Value & 0xFFF); 430 *TargetPtr |= ((Value >> 12) & 0xF) << 16; 431 break; 432 // Write 24 bit relative value to the branch instruction. 433 case ELF::R_ARM_PC24 : // Fall through. 434 case ELF::R_ARM_CALL : // Fall through. 435 case ELF::R_ARM_JUMP24: { 436 int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8); 437 RelValue = (RelValue & 0x03FFFFFC) >> 2; 438 assert((*TargetPtr & 0xFFFFFF) == 0xFFFFFE); 439 *TargetPtr &= 0xFF000000; 440 *TargetPtr |= RelValue; 441 break; 442 } 443 case ELF::R_ARM_PRIVATE_0: 444 // This relocation is reserved by the ARM ELF ABI for internal use. We 445 // appropriate it here to act as an R_ARM_ABS32 without any addend for use 446 // in the stubs created during JIT (which can't put an addend into the 447 // original object file). 448 *TargetPtr = Value; 449 break; 450 } 451 } 452 453 void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section, 454 uint64_t Offset, 455 uint32_t Value, 456 uint32_t Type, 457 int32_t Addend) { 458 uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress + 459 Offset); 460 uint32_t* TargetPtr = (uint32_t*)(Section.Address + Offset); 461 Value += Addend; 462 463 DEBUG(dbgs() << "resolveMipselocation, LocalAddress: " 464 << Section.Address + Offset 465 << " FinalAddress: " 466 << format("%p",Section.LoadAddress + Offset) 467 << " Value: " << format("%x",Value) 468 << " Type: " << format("%x",Type) 469 << " Addend: " << format("%x",Addend) 470 << "\n"); 471 472 switch(Type) { 473 default: 474 llvm_unreachable("Not implemented relocation type!"); 475 break; 476 case ELF::R_MIPS_32: 477 *TargetPtr = Value + (*Placeholder); 478 break; 479 case ELF::R_MIPS_26: 480 *TargetPtr = ((*Placeholder) & 0xfc000000) | (( Value & 0x0fffffff) >> 2); 481 break; 482 case ELF::R_MIPS_HI16: 483 // Get the higher 16-bits. Also add 1 if bit 15 is 1. 484 Value += ((*Placeholder) & 0x0000ffff) << 16; 485 *TargetPtr = ((*Placeholder) & 0xffff0000) | 486 (((Value + 0x8000) >> 16) & 0xffff); 487 break; 488 case ELF::R_MIPS_LO16: 489 Value += ((*Placeholder) & 0x0000ffff); 490 *TargetPtr = ((*Placeholder) & 0xffff0000) | (Value & 0xffff); 491 break; 492 case ELF::R_MIPS_UNUSED1: 493 // Similar to ELF::R_ARM_PRIVATE_0, R_MIPS_UNUSED1 and R_MIPS_UNUSED2 494 // are used for internal JIT purpose. These relocations are similar to 495 // R_MIPS_HI16 and R_MIPS_LO16, but they do not take any addend into 496 // account. 497 *TargetPtr = ((*TargetPtr) & 0xffff0000) | 498 (((Value + 0x8000) >> 16) & 0xffff); 499 break; 500 case ELF::R_MIPS_UNUSED2: 501 *TargetPtr = ((*TargetPtr) & 0xffff0000) | (Value & 0xffff); 502 break; 503 } 504 } 505 506 // Return the .TOC. section address to R_PPC64_TOC relocations. 507 uint64_t RuntimeDyldELF::findPPC64TOC() const { 508 // The TOC consists of sections .got, .toc, .tocbss, .plt in that 509 // order. The TOC starts where the first of these sections starts. 510 SectionList::const_iterator it = Sections.begin(); 511 SectionList::const_iterator ite = Sections.end(); 512 for (; it != ite; ++it) { 513 if (it->Name == ".got" || 514 it->Name == ".toc" || 515 it->Name == ".tocbss" || 516 it->Name == ".plt") 517 break; 518 } 519 if (it == ite) { 520 // This may happen for 521 // * references to TOC base base (sym@toc, .odp relocation) without 522 // a .toc directive. 523 // In this case just use the first section (which is usually 524 // the .odp) since the code won't reference the .toc base 525 // directly. 526 it = Sections.begin(); 527 } 528 assert (it != ite); 529 // Per the ppc64-elf-linux ABI, The TOC base is TOC value plus 0x8000 530 // thus permitting a full 64 Kbytes segment. 531 return it->LoadAddress + 0x8000; 532 } 533 534 // Returns the sections and offset associated with the ODP entry referenced 535 // by Symbol. 536 void RuntimeDyldELF::findOPDEntrySection(ObjectImage &Obj, 537 ObjSectionToIDMap &LocalSections, 538 RelocationValueRef &Rel) { 539 // Get the ELF symbol value (st_value) to compare with Relocation offset in 540 // .opd entries 541 542 error_code err; 543 for (section_iterator si = Obj.begin_sections(), 544 se = Obj.end_sections(); si != se; si.increment(err)) { 545 section_iterator RelSecI = si->getRelocatedSection(); 546 if (RelSecI == Obj.end_sections()) 547 continue; 548 549 StringRef RelSectionName; 550 check(RelSecI->getName(RelSectionName)); 551 if (RelSectionName != ".opd") 552 continue; 553 554 for (relocation_iterator i = si->begin_relocations(), 555 e = si->end_relocations(); i != e;) { 556 check(err); 557 558 // The R_PPC64_ADDR64 relocation indicates the first field 559 // of a .opd entry 560 uint64_t TypeFunc; 561 check(i->getType(TypeFunc)); 562 if (TypeFunc != ELF::R_PPC64_ADDR64) { 563 i.increment(err); 564 continue; 565 } 566 567 uint64_t TargetSymbolOffset; 568 symbol_iterator TargetSymbol = i->getSymbol(); 569 check(i->getOffset(TargetSymbolOffset)); 570 int64_t Addend; 571 check(getELFRelocationAddend(*i, Addend)); 572 573 i = i.increment(err); 574 if (i == e) 575 break; 576 check(err); 577 578 // Just check if following relocation is a R_PPC64_TOC 579 uint64_t TypeTOC; 580 check(i->getType(TypeTOC)); 581 if (TypeTOC != ELF::R_PPC64_TOC) 582 continue; 583 584 // Finally compares the Symbol value and the target symbol offset 585 // to check if this .opd entry refers to the symbol the relocation 586 // points to. 587 if (Rel.Addend != (intptr_t)TargetSymbolOffset) 588 continue; 589 590 section_iterator tsi(Obj.end_sections()); 591 check(TargetSymbol->getSection(tsi)); 592 Rel.SectionID = findOrEmitSection(Obj, (*tsi), true, LocalSections); 593 Rel.Addend = (intptr_t)Addend; 594 return; 595 } 596 } 597 llvm_unreachable("Attempting to get address of ODP entry!"); 598 } 599 600 // Relocation masks following the #lo(value), #hi(value), #higher(value), 601 // and #highest(value) macros defined in section 4.5.1. Relocation Types 602 // in PPC-elf64abi document. 603 // 604 static inline 605 uint16_t applyPPClo (uint64_t value) 606 { 607 return value & 0xffff; 608 } 609 610 static inline 611 uint16_t applyPPChi (uint64_t value) 612 { 613 return (value >> 16) & 0xffff; 614 } 615 616 static inline 617 uint16_t applyPPChigher (uint64_t value) 618 { 619 return (value >> 32) & 0xffff; 620 } 621 622 static inline 623 uint16_t applyPPChighest (uint64_t value) 624 { 625 return (value >> 48) & 0xffff; 626 } 627 628 void RuntimeDyldELF::resolvePPC64Relocation(const SectionEntry &Section, 629 uint64_t Offset, 630 uint64_t Value, 631 uint32_t Type, 632 int64_t Addend) { 633 uint8_t* LocalAddress = Section.Address + Offset; 634 switch (Type) { 635 default: 636 llvm_unreachable("Relocation type not implemented yet!"); 637 break; 638 case ELF::R_PPC64_ADDR16_LO : 639 writeInt16BE(LocalAddress, applyPPClo (Value + Addend)); 640 break; 641 case ELF::R_PPC64_ADDR16_HI : 642 writeInt16BE(LocalAddress, applyPPChi (Value + Addend)); 643 break; 644 case ELF::R_PPC64_ADDR16_HIGHER : 645 writeInt16BE(LocalAddress, applyPPChigher (Value + Addend)); 646 break; 647 case ELF::R_PPC64_ADDR16_HIGHEST : 648 writeInt16BE(LocalAddress, applyPPChighest (Value + Addend)); 649 break; 650 case ELF::R_PPC64_ADDR14 : { 651 assert(((Value + Addend) & 3) == 0); 652 // Preserve the AA/LK bits in the branch instruction 653 uint8_t aalk = *(LocalAddress+3); 654 writeInt16BE(LocalAddress + 2, (aalk & 3) | ((Value + Addend) & 0xfffc)); 655 } break; 656 case ELF::R_PPC64_ADDR32 : { 657 int32_t Result = static_cast<int32_t>(Value + Addend); 658 if (SignExtend32<32>(Result) != Result) 659 llvm_unreachable("Relocation R_PPC64_ADDR32 overflow"); 660 writeInt32BE(LocalAddress, Result); 661 } break; 662 case ELF::R_PPC64_REL24 : { 663 uint64_t FinalAddress = (Section.LoadAddress + Offset); 664 int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend); 665 if (SignExtend32<24>(delta) != delta) 666 llvm_unreachable("Relocation R_PPC64_REL24 overflow"); 667 // Generates a 'bl <address>' instruction 668 writeInt32BE(LocalAddress, 0x48000001 | (delta & 0x03FFFFFC)); 669 } break; 670 case ELF::R_PPC64_REL32 : { 671 uint64_t FinalAddress = (Section.LoadAddress + Offset); 672 int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend); 673 if (SignExtend32<32>(delta) != delta) 674 llvm_unreachable("Relocation R_PPC64_REL32 overflow"); 675 writeInt32BE(LocalAddress, delta); 676 } break; 677 case ELF::R_PPC64_REL64: { 678 uint64_t FinalAddress = (Section.LoadAddress + Offset); 679 uint64_t Delta = Value - FinalAddress + Addend; 680 writeInt64BE(LocalAddress, Delta); 681 } break; 682 case ELF::R_PPC64_ADDR64 : 683 writeInt64BE(LocalAddress, Value + Addend); 684 break; 685 case ELF::R_PPC64_TOC : 686 writeInt64BE(LocalAddress, findPPC64TOC()); 687 break; 688 case ELF::R_PPC64_TOC16 : { 689 uint64_t TOCStart = findPPC64TOC(); 690 Value = applyPPClo((Value + Addend) - TOCStart); 691 writeInt16BE(LocalAddress, applyPPClo(Value)); 692 } break; 693 case ELF::R_PPC64_TOC16_DS : { 694 uint64_t TOCStart = findPPC64TOC(); 695 Value = ((Value + Addend) - TOCStart); 696 writeInt16BE(LocalAddress, applyPPClo(Value)); 697 } break; 698 } 699 } 700 701 void RuntimeDyldELF::resolveSystemZRelocation(const SectionEntry &Section, 702 uint64_t Offset, 703 uint64_t Value, 704 uint32_t Type, 705 int64_t Addend) { 706 uint8_t *LocalAddress = Section.Address + Offset; 707 switch (Type) { 708 default: 709 llvm_unreachable("Relocation type not implemented yet!"); 710 break; 711 case ELF::R_390_PC16DBL: 712 case ELF::R_390_PLT16DBL: { 713 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset); 714 assert(int16_t(Delta / 2) * 2 == Delta && "R_390_PC16DBL overflow"); 715 writeInt16BE(LocalAddress, Delta / 2); 716 break; 717 } 718 case ELF::R_390_PC32DBL: 719 case ELF::R_390_PLT32DBL: { 720 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset); 721 assert(int32_t(Delta / 2) * 2 == Delta && "R_390_PC32DBL overflow"); 722 writeInt32BE(LocalAddress, Delta / 2); 723 break; 724 } 725 case ELF::R_390_PC32: { 726 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset); 727 assert(int32_t(Delta) == Delta && "R_390_PC32 overflow"); 728 writeInt32BE(LocalAddress, Delta); 729 break; 730 } 731 case ELF::R_390_64: 732 writeInt64BE(LocalAddress, Value + Addend); 733 break; 734 } 735 } 736 737 void RuntimeDyldELF::resolveRelocation(const RelocationEntry &RE, 738 uint64_t Value) { 739 const SectionEntry &Section = Sections[RE.SectionID]; 740 return resolveRelocation(Section, RE.Offset, Value, RE.RelType, RE.Addend); 741 } 742 743 void RuntimeDyldELF::resolveRelocation(const SectionEntry &Section, 744 uint64_t Offset, 745 uint64_t Value, 746 uint32_t Type, 747 int64_t Addend) { 748 switch (Arch) { 749 case Triple::x86_64: 750 resolveX86_64Relocation(Section, Offset, Value, Type, Addend); 751 break; 752 case Triple::x86: 753 resolveX86Relocation(Section, Offset, 754 (uint32_t)(Value & 0xffffffffL), Type, 755 (uint32_t)(Addend & 0xffffffffL)); 756 break; 757 case Triple::aarch64: 758 resolveAArch64Relocation(Section, Offset, Value, Type, Addend); 759 break; 760 case Triple::arm: // Fall through. 761 case Triple::thumb: 762 resolveARMRelocation(Section, Offset, 763 (uint32_t)(Value & 0xffffffffL), Type, 764 (uint32_t)(Addend & 0xffffffffL)); 765 break; 766 case Triple::mips: // Fall through. 767 case Triple::mipsel: 768 resolveMIPSRelocation(Section, Offset, 769 (uint32_t)(Value & 0xffffffffL), Type, 770 (uint32_t)(Addend & 0xffffffffL)); 771 break; 772 case Triple::ppc64: // Fall through. 773 case Triple::ppc64le: 774 resolvePPC64Relocation(Section, Offset, Value, Type, Addend); 775 break; 776 case Triple::systemz: 777 resolveSystemZRelocation(Section, Offset, Value, Type, Addend); 778 break; 779 default: llvm_unreachable("Unsupported CPU type!"); 780 } 781 } 782 783 void RuntimeDyldELF::processRelocationRef(unsigned SectionID, 784 RelocationRef RelI, 785 ObjectImage &Obj, 786 ObjSectionToIDMap &ObjSectionToID, 787 const SymbolTableMap &Symbols, 788 StubMap &Stubs) { 789 uint64_t RelType; 790 Check(RelI.getType(RelType)); 791 int64_t Addend; 792 Check(getELFRelocationAddend(RelI, Addend)); 793 symbol_iterator Symbol = RelI.getSymbol(); 794 795 // Obtain the symbol name which is referenced in the relocation 796 StringRef TargetName; 797 if (Symbol != Obj.end_symbols()) 798 Symbol->getName(TargetName); 799 DEBUG(dbgs() << "\t\tRelType: " << RelType 800 << " Addend: " << Addend 801 << " TargetName: " << TargetName 802 << "\n"); 803 RelocationValueRef Value; 804 // First search for the symbol in the local symbol table 805 SymbolTableMap::const_iterator lsi = Symbols.end(); 806 SymbolRef::Type SymType = SymbolRef::ST_Unknown; 807 if (Symbol != Obj.end_symbols()) { 808 lsi = Symbols.find(TargetName.data()); 809 Symbol->getType(SymType); 810 } 811 if (lsi != Symbols.end()) { 812 Value.SectionID = lsi->second.first; 813 Value.Addend = lsi->second.second + Addend; 814 } else { 815 // Search for the symbol in the global symbol table 816 SymbolTableMap::const_iterator gsi = GlobalSymbolTable.end(); 817 if (Symbol != Obj.end_symbols()) 818 gsi = GlobalSymbolTable.find(TargetName.data()); 819 if (gsi != GlobalSymbolTable.end()) { 820 Value.SectionID = gsi->second.first; 821 Value.Addend = gsi->second.second + Addend; 822 } else { 823 switch (SymType) { 824 case SymbolRef::ST_Debug: { 825 // TODO: Now ELF SymbolRef::ST_Debug = STT_SECTION, it's not obviously 826 // and can be changed by another developers. Maybe best way is add 827 // a new symbol type ST_Section to SymbolRef and use it. 828 section_iterator si(Obj.end_sections()); 829 Symbol->getSection(si); 830 if (si == Obj.end_sections()) 831 llvm_unreachable("Symbol section not found, bad object file format!"); 832 DEBUG(dbgs() << "\t\tThis is section symbol\n"); 833 // Default to 'true' in case isText fails (though it never does). 834 bool isCode = true; 835 si->isText(isCode); 836 Value.SectionID = findOrEmitSection(Obj, 837 (*si), 838 isCode, 839 ObjSectionToID); 840 Value.Addend = Addend; 841 break; 842 } 843 case SymbolRef::ST_Unknown: { 844 Value.SymbolName = TargetName.data(); 845 Value.Addend = Addend; 846 847 // Absolute relocations will have a zero symbol ID (STN_UNDEF), which 848 // will manifest here as a NULL symbol name. 849 // We can set this as a valid (but empty) symbol name, and rely 850 // on addRelocationForSymbol to handle this. 851 if (!Value.SymbolName) 852 Value.SymbolName = ""; 853 break; 854 } 855 default: 856 llvm_unreachable("Unresolved symbol type!"); 857 break; 858 } 859 } 860 } 861 uint64_t Offset; 862 Check(RelI.getOffset(Offset)); 863 864 DEBUG(dbgs() << "\t\tSectionID: " << SectionID 865 << " Offset: " << Offset 866 << "\n"); 867 if (Arch == Triple::aarch64 && 868 (RelType == ELF::R_AARCH64_CALL26 || 869 RelType == ELF::R_AARCH64_JUMP26)) { 870 // This is an AArch64 branch relocation, need to use a stub function. 871 DEBUG(dbgs() << "\t\tThis is an AArch64 branch relocation."); 872 SectionEntry &Section = Sections[SectionID]; 873 874 // Look for an existing stub. 875 StubMap::const_iterator i = Stubs.find(Value); 876 if (i != Stubs.end()) { 877 resolveRelocation(Section, Offset, 878 (uint64_t)Section.Address + i->second, RelType, 0); 879 DEBUG(dbgs() << " Stub function found\n"); 880 } else { 881 // Create a new stub function. 882 DEBUG(dbgs() << " Create a new stub function\n"); 883 Stubs[Value] = Section.StubOffset; 884 uint8_t *StubTargetAddr = createStubFunction(Section.Address + 885 Section.StubOffset); 886 887 RelocationEntry REmovz_g3(SectionID, 888 StubTargetAddr - Section.Address, 889 ELF::R_AARCH64_MOVW_UABS_G3, Value.Addend); 890 RelocationEntry REmovk_g2(SectionID, 891 StubTargetAddr - Section.Address + 4, 892 ELF::R_AARCH64_MOVW_UABS_G2_NC, Value.Addend); 893 RelocationEntry REmovk_g1(SectionID, 894 StubTargetAddr - Section.Address + 8, 895 ELF::R_AARCH64_MOVW_UABS_G1_NC, Value.Addend); 896 RelocationEntry REmovk_g0(SectionID, 897 StubTargetAddr - Section.Address + 12, 898 ELF::R_AARCH64_MOVW_UABS_G0_NC, Value.Addend); 899 900 if (Value.SymbolName) { 901 addRelocationForSymbol(REmovz_g3, Value.SymbolName); 902 addRelocationForSymbol(REmovk_g2, Value.SymbolName); 903 addRelocationForSymbol(REmovk_g1, Value.SymbolName); 904 addRelocationForSymbol(REmovk_g0, Value.SymbolName); 905 } else { 906 addRelocationForSection(REmovz_g3, Value.SectionID); 907 addRelocationForSection(REmovk_g2, Value.SectionID); 908 addRelocationForSection(REmovk_g1, Value.SectionID); 909 addRelocationForSection(REmovk_g0, Value.SectionID); 910 } 911 resolveRelocation(Section, Offset, 912 (uint64_t)Section.Address + Section.StubOffset, 913 RelType, 0); 914 Section.StubOffset += getMaxStubSize(); 915 } 916 } else if (Arch == Triple::arm && 917 (RelType == ELF::R_ARM_PC24 || 918 RelType == ELF::R_ARM_CALL || 919 RelType == ELF::R_ARM_JUMP24)) { 920 // This is an ARM branch relocation, need to use a stub function. 921 DEBUG(dbgs() << "\t\tThis is an ARM branch relocation."); 922 SectionEntry &Section = Sections[SectionID]; 923 924 // Look for an existing stub. 925 StubMap::const_iterator i = Stubs.find(Value); 926 if (i != Stubs.end()) { 927 resolveRelocation(Section, Offset, 928 (uint64_t)Section.Address + i->second, RelType, 0); 929 DEBUG(dbgs() << " Stub function found\n"); 930 } else { 931 // Create a new stub function. 932 DEBUG(dbgs() << " Create a new stub function\n"); 933 Stubs[Value] = Section.StubOffset; 934 uint8_t *StubTargetAddr = createStubFunction(Section.Address + 935 Section.StubOffset); 936 RelocationEntry RE(SectionID, StubTargetAddr - Section.Address, 937 ELF::R_ARM_PRIVATE_0, Value.Addend); 938 if (Value.SymbolName) 939 addRelocationForSymbol(RE, Value.SymbolName); 940 else 941 addRelocationForSection(RE, Value.SectionID); 942 943 resolveRelocation(Section, Offset, 944 (uint64_t)Section.Address + Section.StubOffset, 945 RelType, 0); 946 Section.StubOffset += getMaxStubSize(); 947 } 948 } else if ((Arch == Triple::mipsel || Arch == Triple::mips) && 949 RelType == ELF::R_MIPS_26) { 950 // This is an Mips branch relocation, need to use a stub function. 951 DEBUG(dbgs() << "\t\tThis is a Mips branch relocation."); 952 SectionEntry &Section = Sections[SectionID]; 953 uint8_t *Target = Section.Address + Offset; 954 uint32_t *TargetAddress = (uint32_t *)Target; 955 956 // Extract the addend from the instruction. 957 uint32_t Addend = ((*TargetAddress) & 0x03ffffff) << 2; 958 959 Value.Addend += Addend; 960 961 // Look up for existing stub. 962 StubMap::const_iterator i = Stubs.find(Value); 963 if (i != Stubs.end()) { 964 resolveRelocation(Section, Offset, 965 (uint64_t)Section.Address + i->second, RelType, 0); 966 DEBUG(dbgs() << " Stub function found\n"); 967 } else { 968 // Create a new stub function. 969 DEBUG(dbgs() << " Create a new stub function\n"); 970 Stubs[Value] = Section.StubOffset; 971 uint8_t *StubTargetAddr = createStubFunction(Section.Address + 972 Section.StubOffset); 973 974 // Creating Hi and Lo relocations for the filled stub instructions. 975 RelocationEntry REHi(SectionID, 976 StubTargetAddr - Section.Address, 977 ELF::R_MIPS_UNUSED1, Value.Addend); 978 RelocationEntry RELo(SectionID, 979 StubTargetAddr - Section.Address + 4, 980 ELF::R_MIPS_UNUSED2, Value.Addend); 981 982 if (Value.SymbolName) { 983 addRelocationForSymbol(REHi, Value.SymbolName); 984 addRelocationForSymbol(RELo, Value.SymbolName); 985 } else { 986 addRelocationForSection(REHi, Value.SectionID); 987 addRelocationForSection(RELo, Value.SectionID); 988 } 989 990 resolveRelocation(Section, Offset, 991 (uint64_t)Section.Address + Section.StubOffset, 992 RelType, 0); 993 Section.StubOffset += getMaxStubSize(); 994 } 995 } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) { 996 if (RelType == ELF::R_PPC64_REL24) { 997 // A PPC branch relocation will need a stub function if the target is 998 // an external symbol (Symbol::ST_Unknown) or if the target address 999 // is not within the signed 24-bits branch address. 1000 SectionEntry &Section = Sections[SectionID]; 1001 uint8_t *Target = Section.Address + Offset; 1002 bool RangeOverflow = false; 1003 if (SymType != SymbolRef::ST_Unknown) { 1004 // A function call may points to the .opd entry, so the final symbol value 1005 // in calculated based in the relocation values in .opd section. 1006 findOPDEntrySection(Obj, ObjSectionToID, Value); 1007 uint8_t *RelocTarget = Sections[Value.SectionID].Address + Value.Addend; 1008 int32_t delta = static_cast<int32_t>(Target - RelocTarget); 1009 // If it is within 24-bits branch range, just set the branch target 1010 if (SignExtend32<24>(delta) == delta) { 1011 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend); 1012 if (Value.SymbolName) 1013 addRelocationForSymbol(RE, Value.SymbolName); 1014 else 1015 addRelocationForSection(RE, Value.SectionID); 1016 } else { 1017 RangeOverflow = true; 1018 } 1019 } 1020 if (SymType == SymbolRef::ST_Unknown || RangeOverflow == true) { 1021 // It is an external symbol (SymbolRef::ST_Unknown) or within a range 1022 // larger than 24-bits. 1023 StubMap::const_iterator i = Stubs.find(Value); 1024 if (i != Stubs.end()) { 1025 // Symbol function stub already created, just relocate to it 1026 resolveRelocation(Section, Offset, 1027 (uint64_t)Section.Address + i->second, RelType, 0); 1028 DEBUG(dbgs() << " Stub function found\n"); 1029 } else { 1030 // Create a new stub function. 1031 DEBUG(dbgs() << " Create a new stub function\n"); 1032 Stubs[Value] = Section.StubOffset; 1033 uint8_t *StubTargetAddr = createStubFunction(Section.Address + 1034 Section.StubOffset); 1035 RelocationEntry RE(SectionID, StubTargetAddr - Section.Address, 1036 ELF::R_PPC64_ADDR64, Value.Addend); 1037 1038 // Generates the 64-bits address loads as exemplified in section 1039 // 4.5.1 in PPC64 ELF ABI. 1040 RelocationEntry REhst(SectionID, 1041 StubTargetAddr - Section.Address + 2, 1042 ELF::R_PPC64_ADDR16_HIGHEST, Value.Addend); 1043 RelocationEntry REhr(SectionID, 1044 StubTargetAddr - Section.Address + 6, 1045 ELF::R_PPC64_ADDR16_HIGHER, Value.Addend); 1046 RelocationEntry REh(SectionID, 1047 StubTargetAddr - Section.Address + 14, 1048 ELF::R_PPC64_ADDR16_HI, Value.Addend); 1049 RelocationEntry REl(SectionID, 1050 StubTargetAddr - Section.Address + 18, 1051 ELF::R_PPC64_ADDR16_LO, Value.Addend); 1052 1053 if (Value.SymbolName) { 1054 addRelocationForSymbol(REhst, Value.SymbolName); 1055 addRelocationForSymbol(REhr, Value.SymbolName); 1056 addRelocationForSymbol(REh, Value.SymbolName); 1057 addRelocationForSymbol(REl, Value.SymbolName); 1058 } else { 1059 addRelocationForSection(REhst, Value.SectionID); 1060 addRelocationForSection(REhr, Value.SectionID); 1061 addRelocationForSection(REh, Value.SectionID); 1062 addRelocationForSection(REl, Value.SectionID); 1063 } 1064 1065 resolveRelocation(Section, Offset, 1066 (uint64_t)Section.Address + Section.StubOffset, 1067 RelType, 0); 1068 if (SymType == SymbolRef::ST_Unknown) 1069 // Restore the TOC for external calls 1070 writeInt32BE(Target+4, 0xE8410028); // ld r2,40(r1) 1071 Section.StubOffset += getMaxStubSize(); 1072 } 1073 } 1074 } else { 1075 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend); 1076 // Extra check to avoid relocation againt empty symbols (usually 1077 // the R_PPC64_TOC). 1078 if (SymType != SymbolRef::ST_Unknown && TargetName.empty()) 1079 Value.SymbolName = NULL; 1080 1081 if (Value.SymbolName) 1082 addRelocationForSymbol(RE, Value.SymbolName); 1083 else 1084 addRelocationForSection(RE, Value.SectionID); 1085 } 1086 } else if (Arch == Triple::systemz && 1087 (RelType == ELF::R_390_PLT32DBL || 1088 RelType == ELF::R_390_GOTENT)) { 1089 // Create function stubs for both PLT and GOT references, regardless of 1090 // whether the GOT reference is to data or code. The stub contains the 1091 // full address of the symbol, as needed by GOT references, and the 1092 // executable part only adds an overhead of 8 bytes. 1093 // 1094 // We could try to conserve space by allocating the code and data 1095 // parts of the stub separately. However, as things stand, we allocate 1096 // a stub for every relocation, so using a GOT in JIT code should be 1097 // no less space efficient than using an explicit constant pool. 1098 DEBUG(dbgs() << "\t\tThis is a SystemZ indirect relocation."); 1099 SectionEntry &Section = Sections[SectionID]; 1100 1101 // Look for an existing stub. 1102 StubMap::const_iterator i = Stubs.find(Value); 1103 uintptr_t StubAddress; 1104 if (i != Stubs.end()) { 1105 StubAddress = uintptr_t(Section.Address) + i->second; 1106 DEBUG(dbgs() << " Stub function found\n"); 1107 } else { 1108 // Create a new stub function. 1109 DEBUG(dbgs() << " Create a new stub function\n"); 1110 1111 uintptr_t BaseAddress = uintptr_t(Section.Address); 1112 uintptr_t StubAlignment = getStubAlignment(); 1113 StubAddress = (BaseAddress + Section.StubOffset + 1114 StubAlignment - 1) & -StubAlignment; 1115 unsigned StubOffset = StubAddress - BaseAddress; 1116 1117 Stubs[Value] = StubOffset; 1118 createStubFunction((uint8_t *)StubAddress); 1119 RelocationEntry RE(SectionID, StubOffset + 8, 1120 ELF::R_390_64, Value.Addend - Addend); 1121 if (Value.SymbolName) 1122 addRelocationForSymbol(RE, Value.SymbolName); 1123 else 1124 addRelocationForSection(RE, Value.SectionID); 1125 Section.StubOffset = StubOffset + getMaxStubSize(); 1126 } 1127 1128 if (RelType == ELF::R_390_GOTENT) 1129 resolveRelocation(Section, Offset, StubAddress + 8, 1130 ELF::R_390_PC32DBL, Addend); 1131 else 1132 resolveRelocation(Section, Offset, StubAddress, RelType, Addend); 1133 } else { 1134 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend); 1135 if (Value.SymbolName) 1136 addRelocationForSymbol(RE, Value.SymbolName); 1137 else 1138 addRelocationForSection(RE, Value.SectionID); 1139 } 1140 } 1141 1142 bool RuntimeDyldELF::isCompatibleFormat(const ObjectBuffer *Buffer) const { 1143 if (Buffer->getBufferSize() < strlen(ELF::ElfMagic)) 1144 return false; 1145 return (memcmp(Buffer->getBufferStart(), ELF::ElfMagic, strlen(ELF::ElfMagic))) == 0; 1146 } 1147 } // namespace llvm 1148