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/ELF.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; 343 344 345 // AArch64 code is emitted with .rela relocations. The data already in any 346 // bits affected by the relocation on entry is garbage. 347 *TargetPtr &= 0xffe0001fU; 348 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction 349 *TargetPtr |= ((Result & 0xffff00000000ULL) >> (32 - 5)); 350 // Shift must be "lsl #32", in bits 22:21 351 assert((*TargetPtr >> 21 & 0x3) == 2 && "invalid shift for relocation"); 352 break; 353 } 354 case ELF::R_AARCH64_MOVW_UABS_G1_NC: { 355 uint64_t Result = Value + Addend; 356 357 // AArch64 code is emitted with .rela relocations. The data already in any 358 // bits affected by the relocation on entry is garbage. 359 *TargetPtr &= 0xffe0001fU; 360 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction 361 *TargetPtr |= ((Result & 0xffff0000U) >> (16 - 5)); 362 // Shift must be "lsl #16", in bits 22:2 363 assert((*TargetPtr >> 21 & 0x3) == 1 && "invalid shift for relocation"); 364 break; 365 } 366 case ELF::R_AARCH64_MOVW_UABS_G0_NC: { 367 uint64_t Result = Value + Addend; 368 369 // AArch64 code is emitted with .rela relocations. The data already in any 370 // bits affected by the relocation on entry is garbage. 371 *TargetPtr &= 0xffe0001fU; 372 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction 373 *TargetPtr |= ((Result & 0xffffU) << 5); 374 // Shift must be "lsl #0", in bits 22:21. 375 assert((*TargetPtr >> 21 & 0x3) == 0 && "invalid shift for relocation"); 376 break; 377 } 378 } 379 } 380 381 void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section, 382 uint64_t Offset, 383 uint32_t Value, 384 uint32_t Type, 385 int32_t Addend) { 386 // TODO: Add Thumb relocations. 387 uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress + 388 Offset); 389 uint32_t* TargetPtr = (uint32_t*)(Section.Address + Offset); 390 uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF); 391 Value += Addend; 392 393 DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: " 394 << Section.Address + Offset 395 << " FinalAddress: " << format("%p",FinalAddress) 396 << " Value: " << format("%x",Value) 397 << " Type: " << format("%x",Type) 398 << " Addend: " << format("%x",Addend) 399 << "\n"); 400 401 switch(Type) { 402 default: 403 llvm_unreachable("Not implemented relocation type!"); 404 405 // Write a 32bit value to relocation address, taking into account the 406 // implicit addend encoded in the target. 407 case ELF::R_ARM_TARGET1: 408 case ELF::R_ARM_ABS32: 409 *TargetPtr = *Placeholder + Value; 410 break; 411 // Write first 16 bit of 32 bit value to the mov instruction. 412 // Last 4 bit should be shifted. 413 case ELF::R_ARM_MOVW_ABS_NC: 414 // We are not expecting any other addend in the relocation address. 415 // Using 0x000F0FFF because MOVW has its 16 bit immediate split into 2 416 // non-contiguous fields. 417 assert((*Placeholder & 0x000F0FFF) == 0); 418 Value = Value & 0xFFFF; 419 *TargetPtr = *Placeholder | (Value & 0xFFF); 420 *TargetPtr |= ((Value >> 12) & 0xF) << 16; 421 break; 422 // Write last 16 bit of 32 bit value to the mov instruction. 423 // Last 4 bit should be shifted. 424 case ELF::R_ARM_MOVT_ABS: 425 // We are not expecting any other addend in the relocation address. 426 // Use 0x000F0FFF for the same reason as R_ARM_MOVW_ABS_NC. 427 assert((*Placeholder & 0x000F0FFF) == 0); 428 429 Value = (Value >> 16) & 0xFFFF; 430 *TargetPtr = *Placeholder | (Value & 0xFFF); 431 *TargetPtr |= ((Value >> 12) & 0xF) << 16; 432 break; 433 // Write 24 bit relative value to the branch instruction. 434 case ELF::R_ARM_PC24 : // Fall through. 435 case ELF::R_ARM_CALL : // Fall through. 436 case ELF::R_ARM_JUMP24: { 437 int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8); 438 RelValue = (RelValue & 0x03FFFFFC) >> 2; 439 assert((*TargetPtr & 0xFFFFFF) == 0xFFFFFE); 440 *TargetPtr &= 0xFF000000; 441 *TargetPtr |= RelValue; 442 break; 443 } 444 case ELF::R_ARM_PRIVATE_0: 445 // This relocation is reserved by the ARM ELF ABI for internal use. We 446 // appropriate it here to act as an R_ARM_ABS32 without any addend for use 447 // in the stubs created during JIT (which can't put an addend into the 448 // original object file). 449 *TargetPtr = Value; 450 break; 451 } 452 } 453 454 void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section, 455 uint64_t Offset, 456 uint32_t Value, 457 uint32_t Type, 458 int32_t Addend) { 459 uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress + 460 Offset); 461 uint32_t* TargetPtr = (uint32_t*)(Section.Address + Offset); 462 Value += Addend; 463 464 DEBUG(dbgs() << "resolveMipselocation, LocalAddress: " 465 << Section.Address + Offset 466 << " FinalAddress: " 467 << format("%p",Section.LoadAddress + Offset) 468 << " Value: " << format("%x",Value) 469 << " Type: " << format("%x",Type) 470 << " Addend: " << format("%x",Addend) 471 << "\n"); 472 473 switch(Type) { 474 default: 475 llvm_unreachable("Not implemented relocation type!"); 476 break; 477 case ELF::R_MIPS_32: 478 *TargetPtr = Value + (*Placeholder); 479 break; 480 case ELF::R_MIPS_26: 481 *TargetPtr = ((*Placeholder) & 0xfc000000) | (( Value & 0x0fffffff) >> 2); 482 break; 483 case ELF::R_MIPS_HI16: 484 // Get the higher 16-bits. Also add 1 if bit 15 is 1. 485 Value += ((*Placeholder) & 0x0000ffff) << 16; 486 *TargetPtr = ((*Placeholder) & 0xffff0000) | 487 (((Value + 0x8000) >> 16) & 0xffff); 488 break; 489 case ELF::R_MIPS_LO16: 490 Value += ((*Placeholder) & 0x0000ffff); 491 *TargetPtr = ((*Placeholder) & 0xffff0000) | (Value & 0xffff); 492 break; 493 case ELF::R_MIPS_UNUSED1: 494 // Similar to ELF::R_ARM_PRIVATE_0, R_MIPS_UNUSED1 and R_MIPS_UNUSED2 495 // are used for internal JIT purpose. These relocations are similar to 496 // R_MIPS_HI16 and R_MIPS_LO16, but they do not take any addend into 497 // account. 498 *TargetPtr = ((*TargetPtr) & 0xffff0000) | 499 (((Value + 0x8000) >> 16) & 0xffff); 500 break; 501 case ELF::R_MIPS_UNUSED2: 502 *TargetPtr = ((*TargetPtr) & 0xffff0000) | (Value & 0xffff); 503 break; 504 } 505 } 506 507 // Return the .TOC. section address to R_PPC64_TOC relocations. 508 uint64_t RuntimeDyldELF::findPPC64TOC() const { 509 // The TOC consists of sections .got, .toc, .tocbss, .plt in that 510 // order. The TOC starts where the first of these sections starts. 511 SectionList::const_iterator it = Sections.begin(); 512 SectionList::const_iterator ite = Sections.end(); 513 for (; it != ite; ++it) { 514 if (it->Name == ".got" || 515 it->Name == ".toc" || 516 it->Name == ".tocbss" || 517 it->Name == ".plt") 518 break; 519 } 520 if (it == ite) { 521 // This may happen for 522 // * references to TOC base base (sym@toc, .odp relocation) without 523 // a .toc directive. 524 // In this case just use the first section (which is usually 525 // the .odp) since the code won't reference the .toc base 526 // directly. 527 it = Sections.begin(); 528 } 529 assert (it != ite); 530 // Per the ppc64-elf-linux ABI, The TOC base is TOC value plus 0x8000 531 // thus permitting a full 64 Kbytes segment. 532 return it->LoadAddress + 0x8000; 533 } 534 535 // Returns the sections and offset associated with the ODP entry referenced 536 // by Symbol. 537 void RuntimeDyldELF::findOPDEntrySection(ObjectImage &Obj, 538 ObjSectionToIDMap &LocalSections, 539 RelocationValueRef &Rel) { 540 // Get the ELF symbol value (st_value) to compare with Relocation offset in 541 // .opd entries 542 543 error_code err; 544 for (section_iterator si = Obj.begin_sections(), 545 se = Obj.end_sections(); si != se; si.increment(err)) { 546 section_iterator RelSecI = si->getRelocatedSection(); 547 if (RelSecI == Obj.end_sections()) 548 continue; 549 550 StringRef RelSectionName; 551 check(RelSecI->getName(RelSectionName)); 552 if (RelSectionName != ".opd") 553 continue; 554 555 for (relocation_iterator i = si->begin_relocations(), 556 e = si->end_relocations(); i != e;) { 557 check(err); 558 559 // The R_PPC64_ADDR64 relocation indicates the first field 560 // of a .opd entry 561 uint64_t TypeFunc; 562 check(i->getType(TypeFunc)); 563 if (TypeFunc != ELF::R_PPC64_ADDR64) { 564 i.increment(err); 565 continue; 566 } 567 568 uint64_t TargetSymbolOffset; 569 symbol_iterator TargetSymbol = i->getSymbol(); 570 check(i->getOffset(TargetSymbolOffset)); 571 int64_t Addend; 572 check(getELFRelocationAddend(*i, Addend)); 573 574 i = i.increment(err); 575 if (i == e) 576 break; 577 check(err); 578 579 // Just check if following relocation is a R_PPC64_TOC 580 uint64_t TypeTOC; 581 check(i->getType(TypeTOC)); 582 if (TypeTOC != ELF::R_PPC64_TOC) 583 continue; 584 585 // Finally compares the Symbol value and the target symbol offset 586 // to check if this .opd entry refers to the symbol the relocation 587 // points to. 588 if (Rel.Addend != (intptr_t)TargetSymbolOffset) 589 continue; 590 591 section_iterator tsi(Obj.end_sections()); 592 check(TargetSymbol->getSection(tsi)); 593 Rel.SectionID = findOrEmitSection(Obj, (*tsi), true, LocalSections); 594 Rel.Addend = (intptr_t)Addend; 595 return; 596 } 597 } 598 llvm_unreachable("Attempting to get address of ODP entry!"); 599 } 600 601 // Relocation masks following the #lo(value), #hi(value), #higher(value), 602 // and #highest(value) macros defined in section 4.5.1. Relocation Types 603 // in PPC-elf64abi document. 604 // 605 static inline 606 uint16_t applyPPClo (uint64_t value) 607 { 608 return value & 0xffff; 609 } 610 611 static inline 612 uint16_t applyPPChi (uint64_t value) 613 { 614 return (value >> 16) & 0xffff; 615 } 616 617 static inline 618 uint16_t applyPPChigher (uint64_t value) 619 { 620 return (value >> 32) & 0xffff; 621 } 622 623 static inline 624 uint16_t applyPPChighest (uint64_t value) 625 { 626 return (value >> 48) & 0xffff; 627 } 628 629 void RuntimeDyldELF::resolvePPC64Relocation(const SectionEntry &Section, 630 uint64_t Offset, 631 uint64_t Value, 632 uint32_t Type, 633 int64_t Addend) { 634 uint8_t* LocalAddress = Section.Address + Offset; 635 switch (Type) { 636 default: 637 llvm_unreachable("Relocation type not implemented yet!"); 638 break; 639 case ELF::R_PPC64_ADDR16_LO : 640 writeInt16BE(LocalAddress, applyPPClo (Value + Addend)); 641 break; 642 case ELF::R_PPC64_ADDR16_HI : 643 writeInt16BE(LocalAddress, applyPPChi (Value + Addend)); 644 break; 645 case ELF::R_PPC64_ADDR16_HIGHER : 646 writeInt16BE(LocalAddress, applyPPChigher (Value + Addend)); 647 break; 648 case ELF::R_PPC64_ADDR16_HIGHEST : 649 writeInt16BE(LocalAddress, applyPPChighest (Value + Addend)); 650 break; 651 case ELF::R_PPC64_ADDR14 : { 652 assert(((Value + Addend) & 3) == 0); 653 // Preserve the AA/LK bits in the branch instruction 654 uint8_t aalk = *(LocalAddress+3); 655 writeInt16BE(LocalAddress + 2, (aalk & 3) | ((Value + Addend) & 0xfffc)); 656 } break; 657 case ELF::R_PPC64_ADDR32 : { 658 int32_t Result = static_cast<int32_t>(Value + Addend); 659 if (SignExtend32<32>(Result) != Result) 660 llvm_unreachable("Relocation R_PPC64_ADDR32 overflow"); 661 writeInt32BE(LocalAddress, Result); 662 } break; 663 case ELF::R_PPC64_REL24 : { 664 uint64_t FinalAddress = (Section.LoadAddress + Offset); 665 int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend); 666 if (SignExtend32<24>(delta) != delta) 667 llvm_unreachable("Relocation R_PPC64_REL24 overflow"); 668 // Generates a 'bl <address>' instruction 669 writeInt32BE(LocalAddress, 0x48000001 | (delta & 0x03FFFFFC)); 670 } break; 671 case ELF::R_PPC64_REL32 : { 672 uint64_t FinalAddress = (Section.LoadAddress + Offset); 673 int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend); 674 if (SignExtend32<32>(delta) != delta) 675 llvm_unreachable("Relocation R_PPC64_REL32 overflow"); 676 writeInt32BE(LocalAddress, delta); 677 } break; 678 case ELF::R_PPC64_REL64: { 679 uint64_t FinalAddress = (Section.LoadAddress + Offset); 680 uint64_t Delta = Value - FinalAddress + Addend; 681 writeInt64BE(LocalAddress, Delta); 682 } break; 683 case ELF::R_PPC64_ADDR64 : 684 writeInt64BE(LocalAddress, Value + Addend); 685 break; 686 case ELF::R_PPC64_TOC : 687 writeInt64BE(LocalAddress, findPPC64TOC()); 688 break; 689 case ELF::R_PPC64_TOC16 : { 690 uint64_t TOCStart = findPPC64TOC(); 691 Value = applyPPClo((Value + Addend) - TOCStart); 692 writeInt16BE(LocalAddress, applyPPClo(Value)); 693 } break; 694 case ELF::R_PPC64_TOC16_DS : { 695 uint64_t TOCStart = findPPC64TOC(); 696 Value = ((Value + Addend) - TOCStart); 697 writeInt16BE(LocalAddress, applyPPClo(Value)); 698 } break; 699 } 700 } 701 702 void RuntimeDyldELF::resolveSystemZRelocation(const SectionEntry &Section, 703 uint64_t Offset, 704 uint64_t Value, 705 uint32_t Type, 706 int64_t Addend) { 707 uint8_t *LocalAddress = Section.Address + Offset; 708 switch (Type) { 709 default: 710 llvm_unreachable("Relocation type not implemented yet!"); 711 break; 712 case ELF::R_390_PC16DBL: 713 case ELF::R_390_PLT16DBL: { 714 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset); 715 assert(int16_t(Delta / 2) * 2 == Delta && "R_390_PC16DBL overflow"); 716 writeInt16BE(LocalAddress, Delta / 2); 717 break; 718 } 719 case ELF::R_390_PC32DBL: 720 case ELF::R_390_PLT32DBL: { 721 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset); 722 assert(int32_t(Delta / 2) * 2 == Delta && "R_390_PC32DBL overflow"); 723 writeInt32BE(LocalAddress, Delta / 2); 724 break; 725 } 726 case ELF::R_390_PC32: { 727 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset); 728 assert(int32_t(Delta) == Delta && "R_390_PC32 overflow"); 729 writeInt32BE(LocalAddress, Delta); 730 break; 731 } 732 case ELF::R_390_64: 733 writeInt64BE(LocalAddress, Value + Addend); 734 break; 735 } 736 } 737 738 void RuntimeDyldELF::resolveRelocation(const RelocationEntry &RE, 739 uint64_t Value) { 740 const SectionEntry &Section = Sections[RE.SectionID]; 741 return resolveRelocation(Section, RE.Offset, Value, RE.RelType, RE.Addend); 742 } 743 744 void RuntimeDyldELF::resolveRelocation(const SectionEntry &Section, 745 uint64_t Offset, 746 uint64_t Value, 747 uint32_t Type, 748 int64_t Addend) { 749 switch (Arch) { 750 case Triple::x86_64: 751 resolveX86_64Relocation(Section, Offset, Value, Type, Addend); 752 break; 753 case Triple::x86: 754 resolveX86Relocation(Section, Offset, 755 (uint32_t)(Value & 0xffffffffL), Type, 756 (uint32_t)(Addend & 0xffffffffL)); 757 break; 758 case Triple::aarch64: 759 resolveAArch64Relocation(Section, Offset, Value, Type, Addend); 760 break; 761 case Triple::arm: // Fall through. 762 case Triple::thumb: 763 resolveARMRelocation(Section, Offset, 764 (uint32_t)(Value & 0xffffffffL), Type, 765 (uint32_t)(Addend & 0xffffffffL)); 766 break; 767 case Triple::mips: // Fall through. 768 case Triple::mipsel: 769 resolveMIPSRelocation(Section, Offset, 770 (uint32_t)(Value & 0xffffffffL), Type, 771 (uint32_t)(Addend & 0xffffffffL)); 772 break; 773 case Triple::ppc64: // Fall through. 774 case Triple::ppc64le: 775 resolvePPC64Relocation(Section, Offset, Value, Type, Addend); 776 break; 777 case Triple::systemz: 778 resolveSystemZRelocation(Section, Offset, Value, Type, Addend); 779 break; 780 default: llvm_unreachable("Unsupported CPU type!"); 781 } 782 } 783 784 void RuntimeDyldELF::processRelocationRef(unsigned SectionID, 785 RelocationRef RelI, 786 ObjectImage &Obj, 787 ObjSectionToIDMap &ObjSectionToID, 788 const SymbolTableMap &Symbols, 789 StubMap &Stubs) { 790 uint64_t RelType; 791 Check(RelI.getType(RelType)); 792 int64_t Addend; 793 Check(getELFRelocationAddend(RelI, Addend)); 794 symbol_iterator Symbol = RelI.getSymbol(); 795 796 // Obtain the symbol name which is referenced in the relocation 797 StringRef TargetName; 798 if (Symbol != Obj.end_symbols()) 799 Symbol->getName(TargetName); 800 DEBUG(dbgs() << "\t\tRelType: " << RelType 801 << " Addend: " << Addend 802 << " TargetName: " << TargetName 803 << "\n"); 804 RelocationValueRef Value; 805 // First search for the symbol in the local symbol table 806 SymbolTableMap::const_iterator lsi = Symbols.end(); 807 SymbolRef::Type SymType = SymbolRef::ST_Unknown; 808 if (Symbol != Obj.end_symbols()) { 809 lsi = Symbols.find(TargetName.data()); 810 Symbol->getType(SymType); 811 } 812 if (lsi != Symbols.end()) { 813 Value.SectionID = lsi->second.first; 814 Value.Addend = lsi->second.second + Addend; 815 } else { 816 // Search for the symbol in the global symbol table 817 SymbolTableMap::const_iterator gsi = GlobalSymbolTable.end(); 818 if (Symbol != Obj.end_symbols()) 819 gsi = GlobalSymbolTable.find(TargetName.data()); 820 if (gsi != GlobalSymbolTable.end()) { 821 Value.SectionID = gsi->second.first; 822 Value.Addend = gsi->second.second + Addend; 823 } else { 824 switch (SymType) { 825 case SymbolRef::ST_Debug: { 826 // TODO: Now ELF SymbolRef::ST_Debug = STT_SECTION, it's not obviously 827 // and can be changed by another developers. Maybe best way is add 828 // a new symbol type ST_Section to SymbolRef and use it. 829 section_iterator si(Obj.end_sections()); 830 Symbol->getSection(si); 831 if (si == Obj.end_sections()) 832 llvm_unreachable("Symbol section not found, bad object file format!"); 833 DEBUG(dbgs() << "\t\tThis is section symbol\n"); 834 // Default to 'true' in case isText fails (though it never does). 835 bool isCode = true; 836 si->isText(isCode); 837 Value.SectionID = findOrEmitSection(Obj, 838 (*si), 839 isCode, 840 ObjSectionToID); 841 Value.Addend = Addend; 842 break; 843 } 844 case SymbolRef::ST_Unknown: { 845 Value.SymbolName = TargetName.data(); 846 Value.Addend = Addend; 847 break; 848 } 849 default: 850 llvm_unreachable("Unresolved symbol type!"); 851 break; 852 } 853 } 854 } 855 uint64_t Offset; 856 Check(RelI.getOffset(Offset)); 857 858 DEBUG(dbgs() << "\t\tSectionID: " << SectionID 859 << " Offset: " << Offset 860 << "\n"); 861 if (Arch == Triple::aarch64 && 862 (RelType == ELF::R_AARCH64_CALL26 || 863 RelType == ELF::R_AARCH64_JUMP26)) { 864 // This is an AArch64 branch relocation, need to use a stub function. 865 DEBUG(dbgs() << "\t\tThis is an AArch64 branch relocation."); 866 SectionEntry &Section = Sections[SectionID]; 867 868 // Look for an existing stub. 869 StubMap::const_iterator i = Stubs.find(Value); 870 if (i != Stubs.end()) { 871 resolveRelocation(Section, Offset, 872 (uint64_t)Section.Address + i->second, RelType, 0); 873 DEBUG(dbgs() << " Stub function found\n"); 874 } else { 875 // Create a new stub function. 876 DEBUG(dbgs() << " Create a new stub function\n"); 877 Stubs[Value] = Section.StubOffset; 878 uint8_t *StubTargetAddr = createStubFunction(Section.Address + 879 Section.StubOffset); 880 881 RelocationEntry REmovz_g3(SectionID, 882 StubTargetAddr - Section.Address, 883 ELF::R_AARCH64_MOVW_UABS_G3, Value.Addend); 884 RelocationEntry REmovk_g2(SectionID, 885 StubTargetAddr - Section.Address + 4, 886 ELF::R_AARCH64_MOVW_UABS_G2_NC, Value.Addend); 887 RelocationEntry REmovk_g1(SectionID, 888 StubTargetAddr - Section.Address + 8, 889 ELF::R_AARCH64_MOVW_UABS_G1_NC, Value.Addend); 890 RelocationEntry REmovk_g0(SectionID, 891 StubTargetAddr - Section.Address + 12, 892 ELF::R_AARCH64_MOVW_UABS_G0_NC, Value.Addend); 893 894 if (Value.SymbolName) { 895 addRelocationForSymbol(REmovz_g3, Value.SymbolName); 896 addRelocationForSymbol(REmovk_g2, Value.SymbolName); 897 addRelocationForSymbol(REmovk_g1, Value.SymbolName); 898 addRelocationForSymbol(REmovk_g0, Value.SymbolName); 899 } else { 900 addRelocationForSection(REmovz_g3, Value.SectionID); 901 addRelocationForSection(REmovk_g2, Value.SectionID); 902 addRelocationForSection(REmovk_g1, Value.SectionID); 903 addRelocationForSection(REmovk_g0, Value.SectionID); 904 } 905 resolveRelocation(Section, Offset, 906 (uint64_t)Section.Address + Section.StubOffset, 907 RelType, 0); 908 Section.StubOffset += getMaxStubSize(); 909 } 910 } else if (Arch == Triple::arm && 911 (RelType == ELF::R_ARM_PC24 || 912 RelType == ELF::R_ARM_CALL || 913 RelType == ELF::R_ARM_JUMP24)) { 914 // This is an ARM branch relocation, need to use a stub function. 915 DEBUG(dbgs() << "\t\tThis is an ARM branch relocation."); 916 SectionEntry &Section = Sections[SectionID]; 917 918 // Look for an existing stub. 919 StubMap::const_iterator i = Stubs.find(Value); 920 if (i != Stubs.end()) { 921 resolveRelocation(Section, Offset, 922 (uint64_t)Section.Address + i->second, RelType, 0); 923 DEBUG(dbgs() << " Stub function found\n"); 924 } else { 925 // Create a new stub function. 926 DEBUG(dbgs() << " Create a new stub function\n"); 927 Stubs[Value] = Section.StubOffset; 928 uint8_t *StubTargetAddr = createStubFunction(Section.Address + 929 Section.StubOffset); 930 RelocationEntry RE(SectionID, StubTargetAddr - Section.Address, 931 ELF::R_ARM_PRIVATE_0, Value.Addend); 932 if (Value.SymbolName) 933 addRelocationForSymbol(RE, Value.SymbolName); 934 else 935 addRelocationForSection(RE, Value.SectionID); 936 937 resolveRelocation(Section, Offset, 938 (uint64_t)Section.Address + Section.StubOffset, 939 RelType, 0); 940 Section.StubOffset += getMaxStubSize(); 941 } 942 } else if ((Arch == Triple::mipsel || Arch == Triple::mips) && 943 RelType == ELF::R_MIPS_26) { 944 // This is an Mips branch relocation, need to use a stub function. 945 DEBUG(dbgs() << "\t\tThis is a Mips branch relocation."); 946 SectionEntry &Section = Sections[SectionID]; 947 uint8_t *Target = Section.Address + Offset; 948 uint32_t *TargetAddress = (uint32_t *)Target; 949 950 // Extract the addend from the instruction. 951 uint32_t Addend = ((*TargetAddress) & 0x03ffffff) << 2; 952 953 Value.Addend += Addend; 954 955 // Look up for existing stub. 956 StubMap::const_iterator i = Stubs.find(Value); 957 if (i != Stubs.end()) { 958 resolveRelocation(Section, Offset, 959 (uint64_t)Section.Address + i->second, RelType, 0); 960 DEBUG(dbgs() << " Stub function found\n"); 961 } else { 962 // Create a new stub function. 963 DEBUG(dbgs() << " Create a new stub function\n"); 964 Stubs[Value] = Section.StubOffset; 965 uint8_t *StubTargetAddr = createStubFunction(Section.Address + 966 Section.StubOffset); 967 968 // Creating Hi and Lo relocations for the filled stub instructions. 969 RelocationEntry REHi(SectionID, 970 StubTargetAddr - Section.Address, 971 ELF::R_MIPS_UNUSED1, Value.Addend); 972 RelocationEntry RELo(SectionID, 973 StubTargetAddr - Section.Address + 4, 974 ELF::R_MIPS_UNUSED2, Value.Addend); 975 976 if (Value.SymbolName) { 977 addRelocationForSymbol(REHi, Value.SymbolName); 978 addRelocationForSymbol(RELo, Value.SymbolName); 979 } else { 980 addRelocationForSection(REHi, Value.SectionID); 981 addRelocationForSection(RELo, Value.SectionID); 982 } 983 984 resolveRelocation(Section, Offset, 985 (uint64_t)Section.Address + Section.StubOffset, 986 RelType, 0); 987 Section.StubOffset += getMaxStubSize(); 988 } 989 } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) { 990 if (RelType == ELF::R_PPC64_REL24) { 991 // A PPC branch relocation will need a stub function if the target is 992 // an external symbol (Symbol::ST_Unknown) or if the target address 993 // is not within the signed 24-bits branch address. 994 SectionEntry &Section = Sections[SectionID]; 995 uint8_t *Target = Section.Address + Offset; 996 bool RangeOverflow = false; 997 if (SymType != SymbolRef::ST_Unknown) { 998 // A function call may points to the .opd entry, so the final symbol value 999 // in calculated based in the relocation values in .opd section. 1000 findOPDEntrySection(Obj, ObjSectionToID, Value); 1001 uint8_t *RelocTarget = Sections[Value.SectionID].Address + Value.Addend; 1002 int32_t delta = static_cast<int32_t>(Target - RelocTarget); 1003 // If it is within 24-bits branch range, just set the branch target 1004 if (SignExtend32<24>(delta) == delta) { 1005 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend); 1006 if (Value.SymbolName) 1007 addRelocationForSymbol(RE, Value.SymbolName); 1008 else 1009 addRelocationForSection(RE, Value.SectionID); 1010 } else { 1011 RangeOverflow = true; 1012 } 1013 } 1014 if (SymType == SymbolRef::ST_Unknown || RangeOverflow == true) { 1015 // It is an external symbol (SymbolRef::ST_Unknown) or within a range 1016 // larger than 24-bits. 1017 StubMap::const_iterator i = Stubs.find(Value); 1018 if (i != Stubs.end()) { 1019 // Symbol function stub already created, just relocate to it 1020 resolveRelocation(Section, Offset, 1021 (uint64_t)Section.Address + i->second, RelType, 0); 1022 DEBUG(dbgs() << " Stub function found\n"); 1023 } else { 1024 // Create a new stub function. 1025 DEBUG(dbgs() << " Create a new stub function\n"); 1026 Stubs[Value] = Section.StubOffset; 1027 uint8_t *StubTargetAddr = createStubFunction(Section.Address + 1028 Section.StubOffset); 1029 RelocationEntry RE(SectionID, StubTargetAddr - Section.Address, 1030 ELF::R_PPC64_ADDR64, Value.Addend); 1031 1032 // Generates the 64-bits address loads as exemplified in section 1033 // 4.5.1 in PPC64 ELF ABI. 1034 RelocationEntry REhst(SectionID, 1035 StubTargetAddr - Section.Address + 2, 1036 ELF::R_PPC64_ADDR16_HIGHEST, Value.Addend); 1037 RelocationEntry REhr(SectionID, 1038 StubTargetAddr - Section.Address + 6, 1039 ELF::R_PPC64_ADDR16_HIGHER, Value.Addend); 1040 RelocationEntry REh(SectionID, 1041 StubTargetAddr - Section.Address + 14, 1042 ELF::R_PPC64_ADDR16_HI, Value.Addend); 1043 RelocationEntry REl(SectionID, 1044 StubTargetAddr - Section.Address + 18, 1045 ELF::R_PPC64_ADDR16_LO, Value.Addend); 1046 1047 if (Value.SymbolName) { 1048 addRelocationForSymbol(REhst, Value.SymbolName); 1049 addRelocationForSymbol(REhr, Value.SymbolName); 1050 addRelocationForSymbol(REh, Value.SymbolName); 1051 addRelocationForSymbol(REl, Value.SymbolName); 1052 } else { 1053 addRelocationForSection(REhst, Value.SectionID); 1054 addRelocationForSection(REhr, Value.SectionID); 1055 addRelocationForSection(REh, Value.SectionID); 1056 addRelocationForSection(REl, Value.SectionID); 1057 } 1058 1059 resolveRelocation(Section, Offset, 1060 (uint64_t)Section.Address + Section.StubOffset, 1061 RelType, 0); 1062 if (SymType == SymbolRef::ST_Unknown) 1063 // Restore the TOC for external calls 1064 writeInt32BE(Target+4, 0xE8410028); // ld r2,40(r1) 1065 Section.StubOffset += getMaxStubSize(); 1066 } 1067 } 1068 } else { 1069 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend); 1070 // Extra check to avoid relocation againt empty symbols (usually 1071 // the R_PPC64_TOC). 1072 if (Value.SymbolName && !TargetName.empty()) 1073 addRelocationForSymbol(RE, Value.SymbolName); 1074 else 1075 addRelocationForSection(RE, Value.SectionID); 1076 } 1077 } else if (Arch == Triple::systemz && 1078 (RelType == ELF::R_390_PLT32DBL || 1079 RelType == ELF::R_390_GOTENT)) { 1080 // Create function stubs for both PLT and GOT references, regardless of 1081 // whether the GOT reference is to data or code. The stub contains the 1082 // full address of the symbol, as needed by GOT references, and the 1083 // executable part only adds an overhead of 8 bytes. 1084 // 1085 // We could try to conserve space by allocating the code and data 1086 // parts of the stub separately. However, as things stand, we allocate 1087 // a stub for every relocation, so using a GOT in JIT code should be 1088 // no less space efficient than using an explicit constant pool. 1089 DEBUG(dbgs() << "\t\tThis is a SystemZ indirect relocation."); 1090 SectionEntry &Section = Sections[SectionID]; 1091 1092 // Look for an existing stub. 1093 StubMap::const_iterator i = Stubs.find(Value); 1094 uintptr_t StubAddress; 1095 if (i != Stubs.end()) { 1096 StubAddress = uintptr_t(Section.Address) + i->second; 1097 DEBUG(dbgs() << " Stub function found\n"); 1098 } else { 1099 // Create a new stub function. 1100 DEBUG(dbgs() << " Create a new stub function\n"); 1101 1102 uintptr_t BaseAddress = uintptr_t(Section.Address); 1103 uintptr_t StubAlignment = getStubAlignment(); 1104 StubAddress = (BaseAddress + Section.StubOffset + 1105 StubAlignment - 1) & -StubAlignment; 1106 unsigned StubOffset = StubAddress - BaseAddress; 1107 1108 Stubs[Value] = StubOffset; 1109 createStubFunction((uint8_t *)StubAddress); 1110 RelocationEntry RE(SectionID, StubOffset + 8, 1111 ELF::R_390_64, Value.Addend - Addend); 1112 if (Value.SymbolName) 1113 addRelocationForSymbol(RE, Value.SymbolName); 1114 else 1115 addRelocationForSection(RE, Value.SectionID); 1116 Section.StubOffset = StubOffset + getMaxStubSize(); 1117 } 1118 1119 if (RelType == ELF::R_390_GOTENT) 1120 resolveRelocation(Section, Offset, StubAddress + 8, 1121 ELF::R_390_PC32DBL, Addend); 1122 else 1123 resolveRelocation(Section, Offset, StubAddress, RelType, Addend); 1124 } else { 1125 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend); 1126 if (Value.SymbolName) 1127 addRelocationForSymbol(RE, Value.SymbolName); 1128 else 1129 addRelocationForSection(RE, Value.SectionID); 1130 } 1131 } 1132 1133 bool RuntimeDyldELF::isCompatibleFormat(const ObjectBuffer *Buffer) const { 1134 if (Buffer->getBufferSize() < strlen(ELF::ElfMagic)) 1135 return false; 1136 return (memcmp(Buffer->getBufferStart(), ELF::ElfMagic, strlen(ELF::ElfMagic))) == 0; 1137 } 1138 } // namespace llvm 1139
