#define DEBUG_TYPE "dyld"
#include "llvm/ExecutionEngine/RuntimeDyld.h"
+#include "JITRegistrar.h"
#include "ObjectImageCommon.h"
#include "RuntimeDyldELF.h"
#include "RuntimeDyldImpl.h"
#include "RuntimeDyldMachO.h"
+#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MathExtras.h"
-#include "llvm/Support/Path.h"
+#include "llvm/Support/MutexGuard.h"
+#include "llvm/Object/ELF.h"
using namespace llvm;
using namespace llvm::object;
// Empty out-of-line virtual destructor as the key function.
-RTDyldMemoryManager::~RTDyldMemoryManager() {}
RuntimeDyldImpl::~RuntimeDyldImpl() {}
+// Pin the JITRegistrar's and ObjectImage*'s vtables to this file.
+void JITRegistrar::anchor() {}
+void ObjectImage::anchor() {}
+void ObjectImageCommon::anchor() {}
+
namespace llvm {
+void RuntimeDyldImpl::registerEHFrames() {
+}
+
+void RuntimeDyldImpl::deregisterEHFrames() {
+}
+
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
+ MutexGuard locked(lock);
+
// First, resolve relocations associated with external symbols.
resolveExternalSymbols();
// Just iterate over the sections we have and resolve all the relocations
// in them. Gross overkill, but it gets the job done.
for (int i = 0, e = Sections.size(); i != e; ++i) {
+ // The Section here (Sections[i]) refers to the section in which the
+ // symbol for the relocation is located. The SectionID in the relocation
+ // entry provides the section to which the relocation will be applied.
uint64_t Addr = Sections[i].LoadAddress;
DEBUG(dbgs() << "Resolving relocations Section #" << i
<< "\t" << format("%p", (uint8_t *)Addr)
<< "\n");
resolveRelocationList(Relocations[i], Addr);
+ Relocations.erase(i);
}
}
void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress,
uint64_t TargetAddress) {
+ MutexGuard locked(lock);
for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
if (Sections[i].Address == LocalAddress) {
reassignSectionAddress(i, TargetAddress);
}
ObjectImage *RuntimeDyldImpl::loadObject(ObjectBuffer *InputBuffer) {
+ MutexGuard locked(lock);
+
OwningPtr<ObjectImage> obj(createObjectImage(InputBuffer));
if (!obj)
report_fatal_error("Unable to create object image from memory buffer!");
+ // Save information about our target
Arch = (Triple::ArchType)obj->getArch();
+ IsTargetLittleEndian = obj->getObjectFile()->isLittleEndian();
// Symbols found in this object
StringMap<SymbolLoc> LocalSymbols;
bool isCommon = flags & SymbolRef::SF_Common;
if (isCommon) {
// Add the common symbols to a list. We'll allocate them all below.
- uint64_t Align = getCommonSymbolAlignment(*i);
+ uint32_t Align;
+ Check(i->getAlignment(Align));
uint64_t Size = 0;
Check(i->getSize(Size));
CommonSize += Size + Align;
bool isFirstRelocation = true;
unsigned SectionID = 0;
StubMap Stubs;
+ section_iterator RelocatedSection = si->getRelocatedSection();
for (relocation_iterator i = si->begin_relocations(),
e = si->end_relocations(); i != e; i.increment(err)) {
// If it's the first relocation in this section, find its SectionID
if (isFirstRelocation) {
- SectionID = findOrEmitSection(*obj, *si, true, LocalSections);
+ SectionID =
+ findOrEmitSection(*obj, *RelocatedSection, true, LocalSections);
DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
isFirstRelocation = false;
}
- ObjRelocationInfo RI;
- RI.SectionID = SectionID;
- Check(i->getAdditionalInfo(RI.AdditionalInfo));
- Check(i->getOffset(RI.Offset));
- Check(i->getSymbol(RI.Symbol));
- Check(i->getType(RI.Type));
-
- DEBUG(dbgs() << "\t\tAddend: " << RI.AdditionalInfo
- << " Offset: " << format("%p", (uintptr_t)RI.Offset)
- << " Type: " << (uint32_t)(RI.Type & 0xffffffffL)
- << "\n");
- processRelocationRef(RI, *obj, LocalSections, LocalSymbols, Stubs);
+ processRelocationRef(SectionID, *i, *obj, LocalSections, LocalSymbols,
+ Stubs);
}
}
+ // Give the subclasses a chance to tie-up any loose ends.
+ finalizeLoad(LocalSections);
+
return obj.take();
}
SymbolTableMap &SymbolTable) {
// Allocate memory for the section
unsigned SectionID = Sections.size();
- uint8_t *Addr = MemMgr->allocateDataSection(TotalSize, sizeof(void*),
- SectionID, false);
+ uint8_t *Addr = MemMgr->allocateDataSection(
+ TotalSize, sizeof(void*), SectionID, StringRef(), false);
if (!Addr)
report_fatal_error("Unable to allocate memory for common symbols!");
uint64_t Offset = 0;
- Sections.push_back(SectionEntry(StringRef(), Addr, TotalSize, TotalSize, 0));
+ Sections.push_back(SectionEntry(StringRef(), Addr, TotalSize, 0));
memset(Addr, 0, TotalSize);
DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID
unsigned StubBufSize = 0,
StubSize = getMaxStubSize();
error_code err;
+ const ObjectFile *ObjFile = Obj.getObjectFile();
+ // FIXME: this is an inefficient way to handle this. We should computed the
+ // necessary section allocation size in loadObject by walking all the sections
+ // once.
if (StubSize > 0) {
- for (relocation_iterator i = Section.begin_relocations(),
- e = Section.end_relocations(); i != e; i.increment(err), Check(err))
- StubBufSize += StubSize;
+ for (section_iterator SI = ObjFile->begin_sections(),
+ SE = ObjFile->end_sections();
+ SI != SE; SI.increment(err), Check(err)) {
+ section_iterator RelSecI = SI->getRelocatedSection();
+ if (!(RelSecI == Section))
+ continue;
+
+ for (relocation_iterator I = SI->begin_relocations(),
+ E = SI->end_relocations(); I != E; I.increment(err), Check(err)) {
+ StubBufSize += StubSize;
+ }
+ }
}
+
StringRef data;
uint64_t Alignment64;
Check(Section.getContents(data));
bool IsZeroInit;
bool IsReadOnly;
uint64_t DataSize;
+ unsigned PaddingSize = 0;
StringRef Name;
Check(Section.isRequiredForExecution(IsRequired));
Check(Section.isVirtual(IsVirtual));
Check(Section.isReadOnlyData(IsReadOnly));
Check(Section.getSize(DataSize));
Check(Section.getName(Name));
+ if (StubSize > 0) {
+ unsigned StubAlignment = getStubAlignment();
+ unsigned EndAlignment = (DataSize | Alignment) & -(DataSize | Alignment);
+ if (StubAlignment > EndAlignment)
+ StubBufSize += StubAlignment - EndAlignment;
+ }
+
+ // The .eh_frame section (at least on Linux) needs an extra four bytes padded
+ // with zeroes added at the end. For MachO objects, this section has a
+ // slightly different name, so this won't have any effect for MachO objects.
+ if (Name == ".eh_frame")
+ PaddingSize = 4;
unsigned Allocate;
unsigned SectionID = Sections.size();
// Some sections, such as debug info, don't need to be loaded for execution.
// Leave those where they are.
if (IsRequired) {
- Allocate = DataSize + StubBufSize;
+ Allocate = DataSize + PaddingSize + StubBufSize;
Addr = IsCode
- ? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID)
- : MemMgr->allocateDataSection(Allocate, Alignment, SectionID, IsReadOnly);
+ ? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID, Name)
+ : MemMgr->allocateDataSection(Allocate, Alignment, SectionID, Name,
+ IsReadOnly);
if (!Addr)
report_fatal_error("Unable to allocate section memory!");
else
memcpy(Addr, pData, DataSize);
+ // Fill in any extra bytes we allocated for padding
+ if (PaddingSize != 0) {
+ memset(Addr + DataSize, 0, PaddingSize);
+ // Update the DataSize variable so that the stub offset is set correctly.
+ DataSize += PaddingSize;
+ }
+
DEBUG(dbgs() << "emitSection SectionID: " << SectionID
<< " Name: " << Name
<< " obj addr: " << format("%p", pData)
<< "\n");
}
- Sections.push_back(SectionEntry(Name, Addr, Allocate, DataSize,
- (uintptr_t)pData));
+ Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
return SectionID;
}
}
uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
- if (Arch == Triple::arm) {
+ if (Arch == Triple::aarch64) {
+ // This stub has to be able to access the full address space,
+ // since symbol lookup won't necessarily find a handy, in-range,
+ // PLT stub for functions which could be anywhere.
+ uint32_t *StubAddr = (uint32_t*)Addr;
+
+ // Stub can use ip0 (== x16) to calculate address
+ *StubAddr = 0xd2e00010; // movz ip0, #:abs_g3:<addr>
+ StubAddr++;
+ *StubAddr = 0xf2c00010; // movk ip0, #:abs_g2_nc:<addr>
+ StubAddr++;
+ *StubAddr = 0xf2a00010; // movk ip0, #:abs_g1_nc:<addr>
+ StubAddr++;
+ *StubAddr = 0xf2800010; // movk ip0, #:abs_g0_nc:<addr>
+ StubAddr++;
+ *StubAddr = 0xd61f0200; // br ip0
+
+ return Addr;
+ } else if (Arch == Triple::arm) {
// TODO: There is only ARM far stub now. We should add the Thumb stub,
// and stubs for branches Thumb - ARM and ARM - Thumb.
uint32_t *StubAddr = (uint32_t*)Addr;
StubAddr++;
*StubAddr = NopInstr;
return Addr;
- } else if (Arch == Triple::ppc64) {
+ } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
// PowerPC64 stub: the address points to a function descriptor
// instead of the function itself. Load the function address
// on r11 and sets it to control register. Also loads the function
writeInt32BE(Addr+40, 0x4E800420); // bctr
return Addr;
+ } else if (Arch == Triple::systemz) {
+ writeInt16BE(Addr, 0xC418); // lgrl %r1,.+8
+ writeInt16BE(Addr+2, 0x0000);
+ writeInt16BE(Addr+4, 0x0004);
+ writeInt16BE(Addr+6, 0x07F1); // brc 15,%r1
+ // 8-byte address stored at Addr + 8
+ return Addr;
+ } else if (Arch == Triple::x86_64) {
+ *Addr = 0xFF; // jmp
+ *(Addr+1) = 0x25; // rip
+ // 32-bit PC-relative address of the GOT entry will be stored at Addr+2
}
return Addr;
}
Sections[SectionID].LoadAddress = Addr;
}
-void RuntimeDyldImpl::resolveRelocationEntry(const RelocationEntry &RE,
- uint64_t Value) {
- // Ignore relocations for sections that were not loaded
- if (Sections[RE.SectionID].Address != 0) {
- DEBUG(dbgs() << "\tSectionID: " << RE.SectionID
- << " + " << RE.Offset << " ("
- << format("%p", Sections[RE.SectionID].Address + RE.Offset) << ")"
- << " RelType: " << RE.RelType
- << " Addend: " << RE.Addend
- << "\n");
-
- resolveRelocation(Sections[RE.SectionID], RE.Offset,
- Value, RE.RelType, RE.Addend);
- }
-}
-
void RuntimeDyldImpl::resolveRelocationList(const RelocationList &Relocs,
uint64_t Value) {
for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
- resolveRelocationEntry(Relocs[i], Value);
+ const RelocationEntry &RE = Relocs[i];
+ // Ignore relocations for sections that were not loaded
+ if (Sections[RE.SectionID].Address == 0)
+ continue;
+ resolveRelocation(RE, Value);
}
}
void RuntimeDyldImpl::resolveExternalSymbols() {
- StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin(),
- e = ExternalSymbolRelocations.end();
- for (; i != e; i++) {
+ while(!ExternalSymbolRelocations.empty()) {
+ StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin();
+
StringRef Name = i->first();
- RelocationList &Relocs = i->second;
- SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
- if (Loc == GlobalSymbolTable.end()) {
- // This is an external symbol, try to get it address from
- // MemoryManager.
- uint8_t *Addr = (uint8_t*) MemMgr->getPointerToNamedFunction(Name.data(),
- true);
+ if (Name.size() == 0) {
+ // This is an absolute symbol, use an address of zero.
+ DEBUG(dbgs() << "Resolving absolute relocations." << "\n");
+ RelocationList &Relocs = i->second;
+ resolveRelocationList(Relocs, 0);
+ } else {
+ uint64_t Addr = 0;
+ SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
+ if (Loc == GlobalSymbolTable.end()) {
+ // This is an external symbol, try to get its address from
+ // MemoryManager.
+ Addr = MemMgr->getSymbolAddress(Name.data());
+ // The call to getSymbolAddress may have caused additional modules to
+ // be loaded, which may have added new entries to the
+ // ExternalSymbolRelocations map. Consquently, we need to update our
+ // iterator. This is also why retrieval of the relocation list
+ // associated with this symbol is deferred until below this point.
+ // New entries may have been added to the relocation list.
+ i = ExternalSymbolRelocations.find(Name);
+ } else {
+ // We found the symbol in our global table. It was probably in a
+ // Module that we loaded previously.
+ SymbolLoc SymLoc = Loc->second;
+ Addr = getSectionLoadAddress(SymLoc.first) + SymLoc.second;
+ }
+
+ // FIXME: Implement error handling that doesn't kill the host program!
+ if (!Addr)
+ report_fatal_error("Program used external function '" + Name +
+ "' which could not be resolved!");
+
+ updateGOTEntries(Name, Addr);
DEBUG(dbgs() << "Resolving relocations Name: " << Name
- << "\t" << format("%p", Addr)
+ << "\t" << format("0x%lx", Addr)
<< "\n");
- resolveRelocationList(Relocs, (uintptr_t)Addr);
- } else {
- report_fatal_error("Expected external symbol");
+ // This list may have been updated when we called getSymbolAddress, so
+ // don't change this code to get the list earlier.
+ RelocationList &Relocs = i->second;
+ resolveRelocationList(Relocs, Addr);
}
+
+ ExternalSymbolRelocations.erase(i);
}
}
ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *InputBuffer) {
if (!Dyld) {
- sys::LLVMFileType type = sys::IdentifyFileType(
- InputBuffer->getBufferStart(),
- static_cast<unsigned>(InputBuffer->getBufferSize()));
- switch (type) {
- case sys::ELF_Relocatable_FileType:
- case sys::ELF_Executable_FileType:
- case sys::ELF_SharedObject_FileType:
- case sys::ELF_Core_FileType:
- Dyld = new RuntimeDyldELF(MM);
- break;
- case sys::Mach_O_Object_FileType:
- case sys::Mach_O_Executable_FileType:
- case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
- case sys::Mach_O_Core_FileType:
- case sys::Mach_O_PreloadExecutable_FileType:
- case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
- case sys::Mach_O_DynamicLinker_FileType:
- case sys::Mach_O_Bundle_FileType:
- case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
- case sys::Mach_O_DSYMCompanion_FileType:
- Dyld = new RuntimeDyldMachO(MM);
- break;
- case sys::Unknown_FileType:
- case sys::Bitcode_FileType:
- case sys::Archive_FileType:
- case sys::COFF_FileType:
- report_fatal_error("Incompatible object format!");
+ sys::fs::file_magic Type =
+ sys::fs::identify_magic(InputBuffer->getBuffer());
+ switch (Type) {
+ case sys::fs::file_magic::elf_relocatable:
+ case sys::fs::file_magic::elf_executable:
+ case sys::fs::file_magic::elf_shared_object:
+ case sys::fs::file_magic::elf_core:
+ Dyld = new RuntimeDyldELF(MM);
+ break;
+ case sys::fs::file_magic::macho_object:
+ case sys::fs::file_magic::macho_executable:
+ case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
+ case sys::fs::file_magic::macho_core:
+ case sys::fs::file_magic::macho_preload_executable:
+ case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
+ case sys::fs::file_magic::macho_dynamic_linker:
+ case sys::fs::file_magic::macho_bundle:
+ case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
+ case sys::fs::file_magic::macho_dsym_companion:
+ Dyld = new RuntimeDyldMachO(MM);
+ break;
+ case sys::fs::file_magic::unknown:
+ case sys::fs::file_magic::bitcode:
+ case sys::fs::file_magic::archive:
+ case sys::fs::file_magic::coff_object:
+ case sys::fs::file_magic::coff_import_library:
+ case sys::fs::file_magic::pecoff_executable:
+ case sys::fs::file_magic::macho_universal_binary:
+ case sys::fs::file_magic::windows_resource:
+ report_fatal_error("Incompatible object format!");
}
} else {
if (!Dyld->isCompatibleFormat(InputBuffer))
}
void *RuntimeDyld::getSymbolAddress(StringRef Name) {
+ if (!Dyld)
+ return NULL;
return Dyld->getSymbolAddress(Name);
}
uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
+ if (!Dyld)
+ return 0;
return Dyld->getSymbolLoadAddress(Name);
}
return Dyld->getErrorString();
}
+void RuntimeDyld::registerEHFrames() {
+ if (Dyld)
+ Dyld->registerEHFrames();
+}
+
+void RuntimeDyld::deregisterEHFrames() {
+ if (Dyld)
+ Dyld->deregisterEHFrames();
+}
+
} // end namespace llvm
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