//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "dyld"
+#include "llvm/ExecutionEngine/RuntimeDyld.h"
#include "ObjectImageCommon.h"
-#include "RuntimeDyldImpl.h"
#include "RuntimeDyldELF.h"
+#include "RuntimeDyldImpl.h"
#include "RuntimeDyldMachO.h"
-#include "llvm/Support/Path.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MathExtras.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() {}
namespace llvm {
-namespace {
- // Helper for extensive error checking in debug builds.
- error_code Check(error_code Err) {
- if (Err) {
- report_fatal_error(Err.message());
- }
- return Err;
- }
-} // end anonymous namespace
+StringRef RuntimeDyldImpl::getEHFrameSection() {
+ return StringRef();
+}
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
// 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) {
- reassignSectionAddress(i, Sections[i].LoadAddress);
+ uint64_t Addr = Sections[i].LoadAddress;
+ DEBUG(dbgs() << "Resolving relocations Section #" << i
+ << "\t" << format("%p", (uint8_t *)Addr)
+ << "\n");
+ resolveRelocationList(Relocations[i], Addr);
}
}
// Used sections from the object file
ObjSectionToIDMap LocalSections;
- // Common symbols requiring allocation, and the total size required to
- // allocate all common symbols.
+ // Common symbols requiring allocation, with their sizes and alignments
CommonSymbolMap CommonSymbols;
+ // Maximum required total memory to allocate all common symbols
uint64_t CommonSize = 0;
error_code err;
bool isCommon = flags & SymbolRef::SF_Common;
if (isCommon) {
// Add the common symbols to a list. We'll allocate them all below.
+ uint32_t Align;
+ Check(i->getAlignment(Align));
uint64_t Size = 0;
Check(i->getSize(Size));
- CommonSize += Size;
- CommonSymbols[*i] = Size;
+ CommonSize += Size + Align;
+ CommonSymbols[*i] = CommonSymbolInfo(Size, Align);
} else {
if (SymType == object::SymbolRef::ST_Function ||
SymType == object::SymbolRef::ST_Data ||
SymType == object::SymbolRef::ST_Unknown) {
uint64_t FileOffset;
StringRef SectionData;
+ bool IsCode;
section_iterator si = obj->end_sections();
Check(i->getFileOffset(FileOffset));
Check(i->getSection(si));
if (si == obj->end_sections()) continue;
Check(si->getContents(SectionData));
+ Check(si->isText(IsCode));
const uint8_t* SymPtr = (const uint8_t*)InputBuffer->getBufferStart() +
(uintptr_t)FileOffset;
uintptr_t SectOffset = (uintptr_t)(SymPtr -
(const uint8_t*)SectionData.begin());
- unsigned SectionID =
- findOrEmitSection(*obj,
- *si,
- SymType == object::SymbolRef::ST_Function,
- LocalSections);
+ unsigned SectionID = findOrEmitSection(*obj, *si, IsCode, LocalSections);
LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
DEBUG(dbgs() << "\tFileOffset: " << format("%p", (uintptr_t)FileOffset)
<< " flags: " << flags
<< " SID: " << SectionID
<< " Offset: " << format("%p", SectOffset));
- bool isGlobal = flags & SymbolRef::SF_Global;
- if (isGlobal)
- GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
+ GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
}
}
DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
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);
}
}
// Allocate memory for the section
unsigned SectionID = Sections.size();
uint8_t *Addr = MemMgr->allocateDataSection(TotalSize, sizeof(void*),
- SectionID);
+ SectionID, 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
// Assign the address of each symbol
for (CommonSymbolMap::const_iterator it = CommonSymbols.begin(),
itEnd = CommonSymbols.end(); it != itEnd; it++) {
+ uint64_t Size = it->second.first;
+ uint64_t Align = it->second.second;
StringRef Name;
it->first.getName(Name);
+ if (Align) {
+ // This symbol has an alignment requirement.
+ uint64_t AlignOffset = OffsetToAlignment((uint64_t)Addr, Align);
+ Addr += AlignOffset;
+ Offset += AlignOffset;
+ DEBUG(dbgs() << "Allocating common symbol " << Name << " address " <<
+ format("%p\n", Addr));
+ }
Obj.updateSymbolAddress(it->first, (uint64_t)Addr);
SymbolTable[Name.data()] = SymbolLoc(SectionID, Offset);
- uint64_t Size = it->second;
Offset += Size;
Addr += Size;
}
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 IsRequired;
bool IsVirtual;
bool IsZeroInit;
+ bool IsReadOnly;
uint64_t DataSize;
StringRef Name;
Check(Section.isRequiredForExecution(IsRequired));
Check(Section.isVirtual(IsVirtual));
Check(Section.isZeroInit(IsZeroInit));
+ 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;
+ }
unsigned Allocate;
unsigned SectionID = Sections.size();
Allocate = DataSize + StubBufSize;
Addr = IsCode
? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID)
- : MemMgr->allocateDataSection(Allocate, Alignment, SectionID);
+ : MemMgr->allocateDataSection(Allocate, Alignment, SectionID, IsReadOnly);
if (!Addr)
report_fatal_error("Unable to allocate section memory!");
<< "\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 = 0xe51ff004; // ldr pc,<label>
return (uint8_t*)++StubAddr;
- } else if (Arch == Triple::mipsel) {
+ } else if (Arch == Triple::mipsel || Arch == Triple::mips) {
uint32_t *StubAddr = (uint32_t*)Addr;
// 0: 3c190000 lui t9,%hi(addr).
// 4: 27390000 addiu t9,t9,%lo(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+32, 0x7D6903A6); // mtctr r11
writeInt32BE(Addr+36, 0xE96C0010); // ld r11, 16(r2)
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;
}
return Addr;
uint64_t Addr) {
// The address to use for relocation resolution is not
// the address of the local section buffer. We must be doing
- // a remote execution environment of some sort. Re-apply any
- // relocations referencing this section with the given address.
+ // a remote execution environment of some sort. Relocations can't
+ // be applied until all the sections have been moved. The client must
+ // trigger this with a call to MCJIT::finalize() or
+ // RuntimeDyld::resolveRelocations().
//
// Addr is a uint64_t because we can't assume the pointer width
// of the target is the same as that of the host. Just use a generic
// "big enough" type.
Sections[SectionID].LoadAddress = Addr;
- DEBUG(dbgs() << "Resolving relocations Section #" << SectionID
- << "\t" << format("%p", (uint8_t *)Addr)
- << "\n");
- resolveRelocationList(Relocations[SectionID], Addr);
-}
-
-void RuntimeDyldImpl::resolveRelocationEntry(const RelocationEntry &RE,
- uint64_t Value) {
- // Ignore relocations for sections that were not loaded
- if (Sections[RE.SectionID].Address != 0) {
- uint8_t *Target = Sections[RE.SectionID].Address + RE.Offset;
- DEBUG(dbgs() << "\tSectionID: " << RE.SectionID
- << " + " << RE.Offset << " (" << format("%p", Target) << ")"
- << " RelType: " << RE.RelType
- << " Addend: " << RE.Addend
- << "\n");
-
- resolveRelocation(Target, Sections[RE.SectionID].LoadAddress + 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);
}
}
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(),
+ if (Name.size() == 0) {
+ // This is an absolute symbol, use an address of zero.
+ DEBUG(dbgs() << "Resolving absolute relocations." << "\n");
+ resolveRelocationList(Relocs, 0);
+ } else {
+ // This is an external symbol, try to get its address from
+ // MemoryManager.
+ uint8_t *Addr = (uint8_t*) MemMgr->getPointerToNamedFunction(Name.data(),
true);
- DEBUG(dbgs() << "Resolving relocations Name: " << Name
- << "\t" << format("%p", Addr)
- << "\n");
- resolveRelocationList(Relocs, (uintptr_t)Addr);
+ DEBUG(dbgs() << "Resolving relocations Name: " << Name
+ << "\t" << format("%p", Addr)
+ << "\n");
+ resolveRelocationList(Relocs, (uintptr_t)Addr);
+ }
} else {
report_fatal_error("Expected external symbol");
}
//===----------------------------------------------------------------------===//
// RuntimeDyld class implementation
RuntimeDyld::RuntimeDyld(RTDyldMemoryManager *mm) {
+ // FIXME: There's a potential issue lurking here if a single instance of
+ // RuntimeDyld is used to load multiple objects. The current implementation
+ // associates a single memory manager with a RuntimeDyld instance. Even
+ // though the public class spawns a new 'impl' instance for each load,
+ // they share a single memory manager. This can become a problem when page
+ // permissions are applied.
Dyld = 0;
MM = mm;
}
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::pecoff_executable:
+ case sys::fs::file_magic::macho_universal_binary:
+ report_fatal_error("Incompatible object format!");
}
} else {
if (!Dyld->isCompatibleFormat(InputBuffer))
return Dyld->getErrorString();
}
+StringRef RuntimeDyld::getEHFrameSection() {
+ return Dyld->getEHFrameSection();
+}
+
} // end namespace llvm
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