1 //===-- RuntimeDyld.cpp - Run-time dynamic linker for MC-JIT ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Implementation of the MC-JIT runtime dynamic linker.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/ExecutionEngine/RuntimeDyld.h"
15 #include "JITRegistrar.h"
16 #include "ObjectImageCommon.h"
17 #include "RuntimeDyldELF.h"
18 #include "RuntimeDyldImpl.h"
19 #include "RuntimeDyldMachO.h"
20 #include "llvm/Object/ELF.h"
21 #include "llvm/Support/MathExtras.h"
22 #include "llvm/Support/MutexGuard.h"
25 using namespace llvm::object;
27 #define DEBUG_TYPE "dyld"
29 // Empty out-of-line virtual destructor as the key function.
30 RuntimeDyldImpl::~RuntimeDyldImpl() {}
32 // Pin the JITRegistrar's and ObjectImage*'s vtables to this file.
33 void JITRegistrar::anchor() {}
34 void ObjectImage::anchor() {}
35 void ObjectImageCommon::anchor() {}
39 void RuntimeDyldImpl::registerEHFrames() {}
41 void RuntimeDyldImpl::deregisterEHFrames() {}
43 // Resolve the relocations for all symbols we currently know about.
44 void RuntimeDyldImpl::resolveRelocations() {
45 MutexGuard locked(lock);
47 // First, resolve relocations associated with external symbols.
48 resolveExternalSymbols();
50 // Just iterate over the sections we have and resolve all the relocations
51 // in them. Gross overkill, but it gets the job done.
52 for (int i = 0, e = Sections.size(); i != e; ++i) {
53 // The Section here (Sections[i]) refers to the section in which the
54 // symbol for the relocation is located. The SectionID in the relocation
55 // entry provides the section to which the relocation will be applied.
56 uint64_t Addr = Sections[i].LoadAddress;
57 DEBUG(dbgs() << "Resolving relocations Section #" << i << "\t"
58 << format("%p", (uint8_t *)Addr) << "\n");
59 resolveRelocationList(Relocations[i], Addr);
64 void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress,
65 uint64_t TargetAddress) {
66 MutexGuard locked(lock);
67 for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
68 if (Sections[i].Address == LocalAddress) {
69 reassignSectionAddress(i, TargetAddress);
73 llvm_unreachable("Attempting to remap address of unknown section!");
76 static std::error_code getOffset(const SymbolRef &Sym, uint64_t &Result) {
78 if (std::error_code EC = Sym.getAddress(Address))
81 if (Address == UnknownAddressOrSize) {
82 Result = UnknownAddressOrSize;
83 return object_error::success;
86 const ObjectFile *Obj = Sym.getObject();
87 section_iterator SecI(Obj->section_begin());
88 if (std::error_code EC = Sym.getSection(SecI))
91 if (SecI == Obj->section_end()) {
92 Result = UnknownAddressOrSize;
93 return object_error::success;
96 uint64_t SectionAddress;
97 if (std::error_code EC = SecI->getAddress(SectionAddress))
100 Result = Address - SectionAddress;
101 return object_error::success;
104 ObjectImage *RuntimeDyldImpl::loadObject(ObjectImage *InputObject) {
105 MutexGuard locked(lock);
107 std::unique_ptr<ObjectImage> Obj(InputObject);
111 // Save information about our target
112 Arch = (Triple::ArchType)Obj->getArch();
113 IsTargetLittleEndian = Obj->getObjectFile()->isLittleEndian();
115 // Compute the memory size required to load all sections to be loaded
116 // and pass this information to the memory manager
117 if (MemMgr->needsToReserveAllocationSpace()) {
118 uint64_t CodeSize = 0, DataSizeRO = 0, DataSizeRW = 0;
119 computeTotalAllocSize(*Obj, CodeSize, DataSizeRO, DataSizeRW);
120 MemMgr->reserveAllocationSpace(CodeSize, DataSizeRO, DataSizeRW);
123 // Symbols found in this object
124 StringMap<SymbolLoc> LocalSymbols;
125 // Used sections from the object file
126 ObjSectionToIDMap LocalSections;
128 // Common symbols requiring allocation, with their sizes and alignments
129 CommonSymbolMap CommonSymbols;
130 // Maximum required total memory to allocate all common symbols
131 uint64_t CommonSize = 0;
134 DEBUG(dbgs() << "Parse symbols:\n");
135 for (symbol_iterator I = Obj->begin_symbols(), E = Obj->end_symbols(); I != E;
137 object::SymbolRef::Type SymType;
139 Check(I->getType(SymType));
140 Check(I->getName(Name));
142 uint32_t Flags = I->getFlags();
144 bool IsCommon = Flags & SymbolRef::SF_Common;
146 // Add the common symbols to a list. We'll allocate them all below.
147 if (!GlobalSymbolTable.count(Name)) {
149 Check(I->getAlignment(Align));
151 Check(I->getSize(Size));
152 CommonSize += Size + Align;
153 CommonSymbols[*I] = CommonSymbolInfo(Size, Align);
156 if (SymType == object::SymbolRef::ST_Function ||
157 SymType == object::SymbolRef::ST_Data ||
158 SymType == object::SymbolRef::ST_Unknown) {
160 StringRef SectionData;
162 section_iterator SI = Obj->end_sections();
163 Check(getOffset(*I, SectOffset));
164 Check(I->getSection(SI));
165 if (SI == Obj->end_sections())
167 Check(SI->getContents(SectionData));
168 Check(SI->isText(IsCode));
170 findOrEmitSection(*Obj, *SI, IsCode, LocalSections);
171 LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
172 DEBUG(dbgs() << "\tOffset: " << format("%p", (uintptr_t)SectOffset)
173 << " flags: " << Flags << " SID: " << SectionID);
174 GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
177 DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
180 // Allocate common symbols
182 emitCommonSymbols(*Obj, CommonSymbols, CommonSize, GlobalSymbolTable);
184 // Parse and process relocations
185 DEBUG(dbgs() << "Parse relocations:\n");
186 for (section_iterator SI = Obj->begin_sections(), SE = Obj->end_sections();
188 unsigned SectionID = 0;
190 section_iterator RelocatedSection = SI->getRelocatedSection();
192 relocation_iterator I = SI->relocation_begin();
193 relocation_iterator E = SI->relocation_end();
195 if (I == E && !ProcessAllSections)
199 Check(RelocatedSection->isText(IsCode));
201 findOrEmitSection(*Obj, *RelocatedSection, IsCode, LocalSections);
202 DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
205 I = processRelocationRef(SectionID, I, *Obj, LocalSections, LocalSymbols,
209 // Give the subclasses a chance to tie-up any loose ends.
210 finalizeLoad(*Obj, LocalSections);
212 return Obj.release();
215 // A helper method for computeTotalAllocSize.
216 // Computes the memory size required to allocate sections with the given sizes,
217 // assuming that all sections are allocated with the given alignment
219 computeAllocationSizeForSections(std::vector<uint64_t> &SectionSizes,
220 uint64_t Alignment) {
221 uint64_t TotalSize = 0;
222 for (size_t Idx = 0, Cnt = SectionSizes.size(); Idx < Cnt; Idx++) {
223 uint64_t AlignedSize =
224 (SectionSizes[Idx] + Alignment - 1) / Alignment * Alignment;
225 TotalSize += AlignedSize;
230 // Compute an upper bound of the memory size that is required to load all
232 void RuntimeDyldImpl::computeTotalAllocSize(ObjectImage &Obj,
234 uint64_t &DataSizeRO,
235 uint64_t &DataSizeRW) {
236 // Compute the size of all sections required for execution
237 std::vector<uint64_t> CodeSectionSizes;
238 std::vector<uint64_t> ROSectionSizes;
239 std::vector<uint64_t> RWSectionSizes;
240 uint64_t MaxAlignment = sizeof(void *);
242 // Collect sizes of all sections to be loaded;
243 // also determine the max alignment of all sections
244 for (section_iterator SI = Obj.begin_sections(), SE = Obj.end_sections();
246 const SectionRef &Section = *SI;
249 Check(Section.isRequiredForExecution(IsRequired));
251 // Consider only the sections that are required to be loaded for execution
253 uint64_t DataSize = 0;
254 uint64_t Alignment64 = 0;
256 bool IsReadOnly = false;
258 Check(Section.getSize(DataSize));
259 Check(Section.getAlignment(Alignment64));
260 Check(Section.isText(IsCode));
261 Check(Section.isReadOnlyData(IsReadOnly));
262 Check(Section.getName(Name));
263 unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
265 uint64_t StubBufSize = computeSectionStubBufSize(Obj, Section);
266 uint64_t SectionSize = DataSize + StubBufSize;
268 // The .eh_frame section (at least on Linux) needs an extra four bytes
270 // with zeroes added at the end. For MachO objects, this section has a
271 // slightly different name, so this won't have any effect for MachO
273 if (Name == ".eh_frame")
276 if (SectionSize > 0) {
277 // save the total size of the section
279 CodeSectionSizes.push_back(SectionSize);
280 } else if (IsReadOnly) {
281 ROSectionSizes.push_back(SectionSize);
283 RWSectionSizes.push_back(SectionSize);
285 // update the max alignment
286 if (Alignment > MaxAlignment) {
287 MaxAlignment = Alignment;
293 // Compute the size of all common symbols
294 uint64_t CommonSize = 0;
295 for (symbol_iterator I = Obj.begin_symbols(), E = Obj.end_symbols(); I != E;
297 uint32_t Flags = I->getFlags();
298 if (Flags & SymbolRef::SF_Common) {
299 // Add the common symbols to a list. We'll allocate them all below.
301 Check(I->getSize(Size));
305 if (CommonSize != 0) {
306 RWSectionSizes.push_back(CommonSize);
309 // Compute the required allocation space for each different type of sections
310 // (code, read-only data, read-write data) assuming that all sections are
311 // allocated with the max alignment. Note that we cannot compute with the
312 // individual alignments of the sections, because then the required size
313 // depends on the order, in which the sections are allocated.
314 CodeSize = computeAllocationSizeForSections(CodeSectionSizes, MaxAlignment);
315 DataSizeRO = computeAllocationSizeForSections(ROSectionSizes, MaxAlignment);
316 DataSizeRW = computeAllocationSizeForSections(RWSectionSizes, MaxAlignment);
319 // compute stub buffer size for the given section
320 unsigned RuntimeDyldImpl::computeSectionStubBufSize(ObjectImage &Obj,
321 const SectionRef &Section) {
322 unsigned StubSize = getMaxStubSize();
326 // FIXME: this is an inefficient way to handle this. We should computed the
327 // necessary section allocation size in loadObject by walking all the sections
329 unsigned StubBufSize = 0;
330 for (section_iterator SI = Obj.begin_sections(), SE = Obj.end_sections();
332 section_iterator RelSecI = SI->getRelocatedSection();
333 if (!(RelSecI == Section))
336 for (const RelocationRef &Reloc : SI->relocations()) {
338 StubBufSize += StubSize;
342 // Get section data size and alignment
343 uint64_t Alignment64;
345 Check(Section.getSize(DataSize));
346 Check(Section.getAlignment(Alignment64));
348 // Add stubbuf size alignment
349 unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
350 unsigned StubAlignment = getStubAlignment();
351 unsigned EndAlignment = (DataSize | Alignment) & -(DataSize | Alignment);
352 if (StubAlignment > EndAlignment)
353 StubBufSize += StubAlignment - EndAlignment;
357 void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
358 const CommonSymbolMap &CommonSymbols,
360 SymbolTableMap &SymbolTable) {
361 // Allocate memory for the section
362 unsigned SectionID = Sections.size();
363 uint8_t *Addr = MemMgr->allocateDataSection(TotalSize, sizeof(void *),
364 SectionID, StringRef(), false);
366 report_fatal_error("Unable to allocate memory for common symbols!");
368 Sections.push_back(SectionEntry(StringRef(), Addr, TotalSize, 0));
369 memset(Addr, 0, TotalSize);
371 DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID << " new addr: "
372 << format("%p", Addr) << " DataSize: " << TotalSize << "\n");
374 // Assign the address of each symbol
375 for (CommonSymbolMap::const_iterator it = CommonSymbols.begin(),
376 itEnd = CommonSymbols.end(); it != itEnd; ++it) {
377 uint64_t Size = it->second.first;
378 uint64_t Align = it->second.second;
380 it->first.getName(Name);
382 // This symbol has an alignment requirement.
383 uint64_t AlignOffset = OffsetToAlignment((uint64_t)Addr, Align);
385 Offset += AlignOffset;
386 DEBUG(dbgs() << "Allocating common symbol " << Name << " address "
387 << format("%p\n", Addr));
389 Obj.updateSymbolAddress(it->first, (uint64_t)Addr);
390 SymbolTable[Name.data()] = SymbolLoc(SectionID, Offset);
396 unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
397 const SectionRef &Section, bool IsCode) {
400 uint64_t Alignment64;
401 Check(Section.getContents(data));
402 Check(Section.getAlignment(Alignment64));
404 unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
410 unsigned PaddingSize = 0;
411 unsigned StubBufSize = 0;
413 Check(Section.isRequiredForExecution(IsRequired));
414 Check(Section.isVirtual(IsVirtual));
415 Check(Section.isZeroInit(IsZeroInit));
416 Check(Section.isReadOnlyData(IsReadOnly));
417 Check(Section.getSize(DataSize));
418 Check(Section.getName(Name));
420 StubBufSize = computeSectionStubBufSize(Obj, Section);
422 // The .eh_frame section (at least on Linux) needs an extra four bytes padded
423 // with zeroes added at the end. For MachO objects, this section has a
424 // slightly different name, so this won't have any effect for MachO objects.
425 if (Name == ".eh_frame")
429 unsigned SectionID = Sections.size();
431 const char *pData = nullptr;
433 // Some sections, such as debug info, don't need to be loaded for execution.
434 // Leave those where they are.
436 Allocate = DataSize + PaddingSize + StubBufSize;
437 Addr = IsCode ? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID,
439 : MemMgr->allocateDataSection(Allocate, Alignment, SectionID,
442 report_fatal_error("Unable to allocate section memory!");
444 // Virtual sections have no data in the object image, so leave pData = 0
448 // Zero-initialize or copy the data from the image
449 if (IsZeroInit || IsVirtual)
450 memset(Addr, 0, DataSize);
452 memcpy(Addr, pData, DataSize);
454 // Fill in any extra bytes we allocated for padding
455 if (PaddingSize != 0) {
456 memset(Addr + DataSize, 0, PaddingSize);
457 // Update the DataSize variable so that the stub offset is set correctly.
458 DataSize += PaddingSize;
461 DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Name
462 << " obj addr: " << format("%p", pData)
463 << " new addr: " << format("%p", Addr)
464 << " DataSize: " << DataSize << " StubBufSize: " << StubBufSize
465 << " Allocate: " << Allocate << "\n");
466 Obj.updateSectionAddress(Section, (uint64_t)Addr);
468 // Even if we didn't load the section, we need to record an entry for it
469 // to handle later processing (and by 'handle' I mean don't do anything
470 // with these sections).
473 DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Name
474 << " obj addr: " << format("%p", data.data()) << " new addr: 0"
475 << " DataSize: " << DataSize << " StubBufSize: " << StubBufSize
476 << " Allocate: " << Allocate << "\n");
479 Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
483 unsigned RuntimeDyldImpl::findOrEmitSection(ObjectImage &Obj,
484 const SectionRef &Section,
486 ObjSectionToIDMap &LocalSections) {
488 unsigned SectionID = 0;
489 ObjSectionToIDMap::iterator i = LocalSections.find(Section);
490 if (i != LocalSections.end())
491 SectionID = i->second;
493 SectionID = emitSection(Obj, Section, IsCode);
494 LocalSections[Section] = SectionID;
499 void RuntimeDyldImpl::addRelocationForSection(const RelocationEntry &RE,
500 unsigned SectionID) {
501 Relocations[SectionID].push_back(RE);
504 void RuntimeDyldImpl::addRelocationForSymbol(const RelocationEntry &RE,
505 StringRef SymbolName) {
506 // Relocation by symbol. If the symbol is found in the global symbol table,
507 // create an appropriate section relocation. Otherwise, add it to
508 // ExternalSymbolRelocations.
509 SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(SymbolName);
510 if (Loc == GlobalSymbolTable.end()) {
511 ExternalSymbolRelocations[SymbolName].push_back(RE);
513 // Copy the RE since we want to modify its addend.
514 RelocationEntry RECopy = RE;
515 RECopy.Addend += Loc->second.second;
516 Relocations[Loc->second.first].push_back(RECopy);
520 uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr,
521 unsigned AbiVariant) {
522 if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be ||
523 Arch == Triple::arm64 || Arch == Triple::arm64_be) {
524 // This stub has to be able to access the full address space,
525 // since symbol lookup won't necessarily find a handy, in-range,
526 // PLT stub for functions which could be anywhere.
527 uint32_t *StubAddr = (uint32_t *)Addr;
529 // Stub can use ip0 (== x16) to calculate address
530 *StubAddr = 0xd2e00010; // movz ip0, #:abs_g3:<addr>
532 *StubAddr = 0xf2c00010; // movk ip0, #:abs_g2_nc:<addr>
534 *StubAddr = 0xf2a00010; // movk ip0, #:abs_g1_nc:<addr>
536 *StubAddr = 0xf2800010; // movk ip0, #:abs_g0_nc:<addr>
538 *StubAddr = 0xd61f0200; // br ip0
541 } else if (Arch == Triple::arm || Arch == Triple::armeb) {
542 // TODO: There is only ARM far stub now. We should add the Thumb stub,
543 // and stubs for branches Thumb - ARM and ARM - Thumb.
544 uint32_t *StubAddr = (uint32_t *)Addr;
545 *StubAddr = 0xe51ff004; // ldr pc,<label>
546 return (uint8_t *)++StubAddr;
547 } else if (Arch == Triple::mipsel || Arch == Triple::mips) {
548 uint32_t *StubAddr = (uint32_t *)Addr;
549 // 0: 3c190000 lui t9,%hi(addr).
550 // 4: 27390000 addiu t9,t9,%lo(addr).
551 // 8: 03200008 jr t9.
553 const unsigned LuiT9Instr = 0x3c190000, AdduiT9Instr = 0x27390000;
554 const unsigned JrT9Instr = 0x03200008, NopInstr = 0x0;
556 *StubAddr = LuiT9Instr;
558 *StubAddr = AdduiT9Instr;
560 *StubAddr = JrT9Instr;
562 *StubAddr = NopInstr;
564 } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
565 // Depending on which version of the ELF ABI is in use, we need to
566 // generate one of two variants of the stub. They both start with
567 // the same sequence to load the target address into r12.
568 writeInt32BE(Addr, 0x3D800000); // lis r12, highest(addr)
569 writeInt32BE(Addr+4, 0x618C0000); // ori r12, higher(addr)
570 writeInt32BE(Addr+8, 0x798C07C6); // sldi r12, r12, 32
571 writeInt32BE(Addr+12, 0x658C0000); // oris r12, r12, h(addr)
572 writeInt32BE(Addr+16, 0x618C0000); // ori r12, r12, l(addr)
573 if (AbiVariant == 2) {
574 // PowerPC64 stub ELFv2 ABI: The address points to the function itself.
575 // The address is already in r12 as required by the ABI. Branch to it.
576 writeInt32BE(Addr+20, 0xF8410018); // std r2, 24(r1)
577 writeInt32BE(Addr+24, 0x7D8903A6); // mtctr r12
578 writeInt32BE(Addr+28, 0x4E800420); // bctr
580 // PowerPC64 stub ELFv1 ABI: The address points to a function descriptor.
581 // Load the function address on r11 and sets it to control register. Also
582 // loads the function TOC in r2 and environment pointer to r11.
583 writeInt32BE(Addr+20, 0xF8410028); // std r2, 40(r1)
584 writeInt32BE(Addr+24, 0xE96C0000); // ld r11, 0(r12)
585 writeInt32BE(Addr+28, 0xE84C0008); // ld r2, 0(r12)
586 writeInt32BE(Addr+32, 0x7D6903A6); // mtctr r11
587 writeInt32BE(Addr+36, 0xE96C0010); // ld r11, 16(r2)
588 writeInt32BE(Addr+40, 0x4E800420); // bctr
591 } else if (Arch == Triple::systemz) {
592 writeInt16BE(Addr, 0xC418); // lgrl %r1,.+8
593 writeInt16BE(Addr+2, 0x0000);
594 writeInt16BE(Addr+4, 0x0004);
595 writeInt16BE(Addr+6, 0x07F1); // brc 15,%r1
596 // 8-byte address stored at Addr + 8
598 } else if (Arch == Triple::x86_64) {
600 *(Addr+1) = 0x25; // rip
601 // 32-bit PC-relative address of the GOT entry will be stored at Addr+2
602 } else if (Arch == Triple::x86) {
603 *Addr = 0xE9; // 32-bit pc-relative jump.
608 // Assign an address to a symbol name and resolve all the relocations
609 // associated with it.
610 void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
612 // The address to use for relocation resolution is not
613 // the address of the local section buffer. We must be doing
614 // a remote execution environment of some sort. Relocations can't
615 // be applied until all the sections have been moved. The client must
616 // trigger this with a call to MCJIT::finalize() or
617 // RuntimeDyld::resolveRelocations().
619 // Addr is a uint64_t because we can't assume the pointer width
620 // of the target is the same as that of the host. Just use a generic
621 // "big enough" type.
622 Sections[SectionID].LoadAddress = Addr;
625 void RuntimeDyldImpl::resolveRelocationList(const RelocationList &Relocs,
627 for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
628 const RelocationEntry &RE = Relocs[i];
629 // Ignore relocations for sections that were not loaded
630 if (Sections[RE.SectionID].Address == nullptr)
632 resolveRelocation(RE, Value);
636 void RuntimeDyldImpl::resolveExternalSymbols() {
637 while (!ExternalSymbolRelocations.empty()) {
638 StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin();
640 StringRef Name = i->first();
641 if (Name.size() == 0) {
642 // This is an absolute symbol, use an address of zero.
643 DEBUG(dbgs() << "Resolving absolute relocations."
645 RelocationList &Relocs = i->second;
646 resolveRelocationList(Relocs, 0);
649 SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
650 if (Loc == GlobalSymbolTable.end()) {
651 // This is an external symbol, try to get its address from
653 Addr = MemMgr->getSymbolAddress(Name.data());
654 // The call to getSymbolAddress may have caused additional modules to
655 // be loaded, which may have added new entries to the
656 // ExternalSymbolRelocations map. Consquently, we need to update our
657 // iterator. This is also why retrieval of the relocation list
658 // associated with this symbol is deferred until below this point.
659 // New entries may have been added to the relocation list.
660 i = ExternalSymbolRelocations.find(Name);
662 // We found the symbol in our global table. It was probably in a
663 // Module that we loaded previously.
664 SymbolLoc SymLoc = Loc->second;
665 Addr = getSectionLoadAddress(SymLoc.first) + SymLoc.second;
668 // FIXME: Implement error handling that doesn't kill the host program!
670 report_fatal_error("Program used external function '" + Name +
671 "' which could not be resolved!");
673 updateGOTEntries(Name, Addr);
674 DEBUG(dbgs() << "Resolving relocations Name: " << Name << "\t"
675 << format("0x%lx", Addr) << "\n");
676 // This list may have been updated when we called getSymbolAddress, so
677 // don't change this code to get the list earlier.
678 RelocationList &Relocs = i->second;
679 resolveRelocationList(Relocs, Addr);
682 ExternalSymbolRelocations.erase(i);
686 //===----------------------------------------------------------------------===//
687 // RuntimeDyld class implementation
688 RuntimeDyld::RuntimeDyld(RTDyldMemoryManager *mm) {
689 // FIXME: There's a potential issue lurking here if a single instance of
690 // RuntimeDyld is used to load multiple objects. The current implementation
691 // associates a single memory manager with a RuntimeDyld instance. Even
692 // though the public class spawns a new 'impl' instance for each load,
693 // they share a single memory manager. This can become a problem when page
694 // permissions are applied.
697 ProcessAllSections = false;
700 RuntimeDyld::~RuntimeDyld() { delete Dyld; }
702 static std::unique_ptr<RuntimeDyldELF>
703 createRuntimeDyldELF(RTDyldMemoryManager *MM, bool ProcessAllSections) {
704 std::unique_ptr<RuntimeDyldELF> Dyld(new RuntimeDyldELF(MM));
705 Dyld->setProcessAllSections(ProcessAllSections);
709 static std::unique_ptr<RuntimeDyldMachO>
710 createRuntimeDyldMachO(Triple::ArchType Arch, RTDyldMemoryManager *MM,
711 bool ProcessAllSections) {
712 std::unique_ptr<RuntimeDyldMachO> Dyld(RuntimeDyldMachO::create(Arch, MM));
713 Dyld->setProcessAllSections(ProcessAllSections);
717 ObjectImage *RuntimeDyld::loadObject(std::unique_ptr<ObjectFile> InputObject) {
718 std::unique_ptr<ObjectImage> InputImage;
720 ObjectFile &Obj = *InputObject;
722 if (InputObject->isELF()) {
723 InputImage.reset(RuntimeDyldELF::createObjectImageFromFile(std::move(InputObject)));
725 Dyld = createRuntimeDyldELF(MM, ProcessAllSections).release();
726 } else if (InputObject->isMachO()) {
727 InputImage.reset(RuntimeDyldMachO::createObjectImageFromFile(std::move(InputObject)));
729 Dyld = createRuntimeDyldMachO(
730 static_cast<Triple::ArchType>(InputImage->getArch()),
731 MM, ProcessAllSections).release();
733 report_fatal_error("Incompatible object format!");
735 if (!Dyld->isCompatibleFile(&Obj))
736 report_fatal_error("Incompatible object format!");
738 Dyld->loadObject(InputImage.get());
739 return InputImage.release();
742 ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *InputBuffer) {
743 std::unique_ptr<ObjectImage> InputImage;
744 sys::fs::file_magic Type = sys::fs::identify_magic(InputBuffer->getBuffer());
747 case sys::fs::file_magic::elf_relocatable:
748 case sys::fs::file_magic::elf_executable:
749 case sys::fs::file_magic::elf_shared_object:
750 case sys::fs::file_magic::elf_core:
751 InputImage.reset(RuntimeDyldELF::createObjectImage(InputBuffer));
753 Dyld = createRuntimeDyldELF(MM, ProcessAllSections).release();
755 case sys::fs::file_magic::macho_object:
756 case sys::fs::file_magic::macho_executable:
757 case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
758 case sys::fs::file_magic::macho_core:
759 case sys::fs::file_magic::macho_preload_executable:
760 case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
761 case sys::fs::file_magic::macho_dynamic_linker:
762 case sys::fs::file_magic::macho_bundle:
763 case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
764 case sys::fs::file_magic::macho_dsym_companion:
765 InputImage.reset(RuntimeDyldMachO::createObjectImage(InputBuffer));
767 Dyld = createRuntimeDyldMachO(
768 static_cast<Triple::ArchType>(InputImage->getArch()),
769 MM, ProcessAllSections).release();
771 case sys::fs::file_magic::unknown:
772 case sys::fs::file_magic::bitcode:
773 case sys::fs::file_magic::archive:
774 case sys::fs::file_magic::coff_object:
775 case sys::fs::file_magic::coff_import_library:
776 case sys::fs::file_magic::pecoff_executable:
777 case sys::fs::file_magic::macho_universal_binary:
778 case sys::fs::file_magic::windows_resource:
779 report_fatal_error("Incompatible object format!");
782 if (!Dyld->isCompatibleFormat(InputBuffer))
783 report_fatal_error("Incompatible object format!");
785 Dyld->loadObject(InputImage.get());
786 return InputImage.release();
789 void *RuntimeDyld::getSymbolAddress(StringRef Name) {
792 return Dyld->getSymbolAddress(Name);
795 uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
798 return Dyld->getSymbolLoadAddress(Name);
801 void RuntimeDyld::resolveRelocations() { Dyld->resolveRelocations(); }
803 void RuntimeDyld::reassignSectionAddress(unsigned SectionID, uint64_t Addr) {
804 Dyld->reassignSectionAddress(SectionID, Addr);
807 void RuntimeDyld::mapSectionAddress(const void *LocalAddress,
808 uint64_t TargetAddress) {
809 Dyld->mapSectionAddress(LocalAddress, TargetAddress);
812 bool RuntimeDyld::hasError() { return Dyld->hasError(); }
814 StringRef RuntimeDyld::getErrorString() { return Dyld->getErrorString(); }
816 void RuntimeDyld::registerEHFrames() {
818 Dyld->registerEHFrames();
821 void RuntimeDyld::deregisterEHFrames() {
823 Dyld->deregisterEHFrames();
826 } // end namespace llvm