//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "dyld"
-#include "RuntimeDyldImpl.h"
+#include "llvm/ExecutionEngine/RuntimeDyld.h"
+#include "ObjectImageCommon.h"
#include "RuntimeDyldELF.h"
+#include "RuntimeDyldImpl.h"
#include "RuntimeDyldMachO.h"
+#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Path.h"
using namespace llvm;
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
-
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
// First, resolve relocations associated with external symbols.
- resolveSymbols();
+ 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) {
- 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);
}
}
-void RuntimeDyldImpl::mapSectionAddress(void *LocalAddress,
+void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress,
uint64_t TargetAddress) {
for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
if (Sections[i].Address == LocalAddress) {
llvm_unreachable("Attempting to remap address of unknown section!");
}
-// Subclasses can implement this method to create specialized image instances
-// The caller owns the the pointer that is returned.
-ObjectImage *RuntimeDyldImpl::createObjectImage(const MemoryBuffer *InputBuffer) {
- ObjectFile *ObjFile = ObjectFile::createObjectFile(const_cast<MemoryBuffer*>
- (InputBuffer));
- ObjectImage *Obj = new ObjectImage(ObjFile);
- return Obj;
+// Subclasses can implement this method to create specialized image instances.
+// The caller owns the pointer that is returned.
+ObjectImage *RuntimeDyldImpl::createObjectImage(ObjectBuffer *InputBuffer) {
+ return new ObjectImageCommon(InputBuffer);
}
-bool RuntimeDyldImpl::loadObject(const MemoryBuffer *InputBuffer) {
+ObjectImage *RuntimeDyldImpl::loadObject(ObjectBuffer *InputBuffer) {
OwningPtr<ObjectImage> obj(createObjectImage(InputBuffer));
if (!obj)
report_fatal_error("Unable to create object image from memory buffer!");
Arch = (Triple::ArchType)obj->getArch();
- LocalSymbolMap LocalSymbols; // Functions and data symbols from the
- // object file.
- ObjSectionToIDMap LocalSections; // Used sections from the object file
- CommonSymbolMap CommonSymbols; // Common symbols requiring allocation
- uint64_t CommonSize = 0;
+ // Symbols found in this object
+ StringMap<SymbolLoc> LocalSymbols;
+ // Used sections from the object file
+ ObjSectionToIDMap LocalSections;
+
+ // 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;
// Parse symbols
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);
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_Data ||
+ SymType == object::SymbolRef::ST_Unknown) {
uint64_t FileOffset;
- StringRef sData;
+ StringRef SectionData;
section_iterator si = obj->end_sections();
Check(i->getFileOffset(FileOffset));
Check(i->getSection(si));
if (si == obj->end_sections()) continue;
- Check(si->getContents(sData));
+ Check(si->getContents(SectionData));
const uint8_t* SymPtr = (const uint8_t*)InputBuffer->getBufferStart() +
(uintptr_t)FileOffset;
- uintptr_t SectOffset = (uintptr_t)(SymPtr - (const uint8_t*)sData.begin());
+ uintptr_t SectOffset = (uintptr_t)(SymPtr -
+ (const uint8_t*)SectionData.begin());
unsigned SectionID =
findOrEmitSection(*obj,
*si,
SymType == object::SymbolRef::ST_Function,
LocalSections);
- bool isGlobal = flags & SymbolRef::SF_Global;
LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
DEBUG(dbgs() << "\tFileOffset: " << format("%p", (uintptr_t)FileOffset)
<< " flags: " << flags
<< " SID: " << SectionID
<< " Offset: " << format("%p", SectOffset));
- if (isGlobal)
- SymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
+ GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
}
}
DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
if (CommonSize != 0)
emitCommonSymbols(*obj, CommonSymbols, CommonSize, LocalSymbols);
- // Parse and proccess relocations
+ // Parse and process relocations
DEBUG(dbgs() << "Parse relocations:\n");
for (section_iterator si = obj->begin_sections(),
se = obj->end_sections(); si != se; si.increment(err)) {
e = si->end_relocations(); i != e; i.increment(err)) {
Check(err);
- // If it's first relocation in this section, find its SectionID
+ // If it's the first relocation in this section, find its SectionID
if (isFirstRelocation) {
SectionID = findOrEmitSection(*obj, *si, true, LocalSections);
DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
}
}
- handleObjectLoaded(obj.take());
-
- return false;
+ return obj.take();
}
-unsigned RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
- const CommonSymbolMap &Map,
- uint64_t TotalSize,
- LocalSymbolMap &LocalSymbols) {
+void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
+ const CommonSymbolMap &CommonSymbols,
+ uint64_t TotalSize,
+ SymbolTableMap &SymbolTable) {
// 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(Addr, TotalSize, TotalSize, 0));
+ Sections.push_back(SectionEntry(StringRef(), Addr, TotalSize, TotalSize, 0));
memset(Addr, 0, TotalSize);
DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID
<< "\n");
// Assign the address of each symbol
- for (CommonSymbolMap::const_iterator it = Map.begin(), itEnd = Map.end();
- it != itEnd; it++) {
- uint64_t Size = it->second;
+ 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);
- LocalSymbols[Name.data()] = SymbolLoc(SectionID, Offset);
+ SymbolTable[Name.data()] = SymbolLoc(SectionID, Offset);
Offset += Size;
Addr += Size;
}
-
- return SectionID;
}
unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
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));
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!");
memcpy(Addr, pData, DataSize);
DEBUG(dbgs() << "emitSection SectionID: " << SectionID
+ << " Name: " << Name
<< " obj addr: " << format("%p", pData)
<< " new addr: " << format("%p", Addr)
<< " DataSize: " << DataSize
}
else {
// Even if we didn't load the section, we need to record an entry for it
- // to handle later processing (and by 'handle' I mean don't do anything
- // with these sections).
+ // to handle later processing (and by 'handle' I mean don't do anything
+ // with these sections).
Allocate = 0;
Addr = 0;
DEBUG(dbgs() << "emitSection SectionID: " << SectionID
+ << " Name: " << Name
<< " obj addr: " << format("%p", data.data())
<< " new addr: 0"
<< " DataSize: " << DataSize
<< "\n");
}
- Sections.push_back(SectionEntry(Addr, Allocate, DataSize,(uintptr_t)pData));
+ Sections.push_back(SectionEntry(Name, Addr, Allocate, DataSize,
+ (uintptr_t)pData));
return SectionID;
}
return SectionID;
}
-void RuntimeDyldImpl::AddRelocation(const RelocationValueRef &Value,
- unsigned SectionID, uintptr_t Offset,
- uint32_t RelType) {
- DEBUG(dbgs() << "AddRelocation SymNamePtr: " << format("%p", Value.SymbolName)
- << " SID: " << Value.SectionID
- << " Addend: " << format("%p", Value.Addend)
- << " Offset: " << format("%p", Offset)
- << " RelType: " << format("%x", RelType)
- << "\n");
+void RuntimeDyldImpl::addRelocationForSection(const RelocationEntry &RE,
+ unsigned SectionID) {
+ Relocations[SectionID].push_back(RE);
+}
- if (Value.SymbolName == 0) {
- Relocations[Value.SectionID].push_back(RelocationEntry(
- SectionID,
- Offset,
- RelType,
- Value.Addend));
- } else
- SymbolRelocations[Value.SymbolName].push_back(RelocationEntry(
- SectionID,
- Offset,
- RelType,
- Value.Addend));
+void RuntimeDyldImpl::addRelocationForSymbol(const RelocationEntry &RE,
+ StringRef SymbolName) {
+ // Relocation by symbol. If the symbol is found in the global symbol table,
+ // create an appropriate section relocation. Otherwise, add it to
+ // ExternalSymbolRelocations.
+ SymbolTableMap::const_iterator Loc =
+ GlobalSymbolTable.find(SymbolName);
+ if (Loc == GlobalSymbolTable.end()) {
+ ExternalSymbolRelocations[SymbolName].push_back(RE);
+ } else {
+ // Copy the RE since we want to modify its addend.
+ RelocationEntry RECopy = RE;
+ RECopy.Addend += Loc->second.second;
+ Relocations[Loc->second.first].push_back(RECopy);
+ }
}
uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
- // TODO: There is only ARM far stub now. We should add the Thumb stub,
- // and stubs for branches Thumb - ARM and ARM - Thumb.
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
+ } else if (Arch == Triple::mipsel) {
+ uint32_t *StubAddr = (uint32_t*)Addr;
+ // 0: 3c190000 lui t9,%hi(addr).
+ // 4: 27390000 addiu t9,t9,%lo(addr).
+ // 8: 03200008 jr t9.
+ // c: 00000000 nop.
+ const unsigned LuiT9Instr = 0x3c190000, AdduiT9Instr = 0x27390000;
+ const unsigned JrT9Instr = 0x03200008, NopInstr = 0x0;
+
+ *StubAddr = LuiT9Instr;
+ StubAddr++;
+ *StubAddr = AdduiT9Instr;
+ StubAddr++;
+ *StubAddr = JrT9Instr;
+ StubAddr++;
+ *StubAddr = NopInstr;
return Addr;
+ } else if (Arch == Triple::ppc64) {
+ // 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
+ // TOC in r2 and environment pointer to r11.
+ writeInt32BE(Addr, 0x3D800000); // lis r12, highest(addr)
+ writeInt32BE(Addr+4, 0x618C0000); // ori r12, higher(addr)
+ writeInt32BE(Addr+8, 0x798C07C6); // sldi r12, r12, 32
+ writeInt32BE(Addr+12, 0x658C0000); // oris r12, r12, h(addr)
+ writeInt32BE(Addr+16, 0x618C0000); // ori r12, r12, l(addr)
+ writeInt32BE(Addr+20, 0xF8410028); // std r2, 40(r1)
+ writeInt32BE(Addr+24, 0xE96C0000); // ld r11, 0(r12)
+ writeInt32BE(Addr+28, 0xE84C0008); // ld r2, 0(r12)
+ writeInt32BE(Addr+32, 0x7D6903A6); // mtctr r11
+ writeInt32BE(Addr+36, 0xE96C0010); // ld r11, 16(r2)
+ writeInt32BE(Addr+40, 0x4E800420); // bctr
+
+ return Addr;
+ }
+ return Addr;
}
// Assign an address to a symbol name and resolve all the relocations
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) << ")"
- << " Data: " << RE.Data
- << " Addend: " << RE.Addend
- << "\n");
+ // 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(Target, Sections[RE.SectionID].LoadAddress + RE.Offset,
- Value, RE.Data, RE.Addend);
+ resolveRelocation(Sections[RE.SectionID], RE.Offset,
+ Value, RE.RelType, RE.Addend);
}
}
}
}
-// resolveSymbols - Resolve any relocations to the specified symbols if
-// we know where it lives.
-void RuntimeDyldImpl::resolveSymbols() {
- StringMap<RelocationList>::iterator i = SymbolRelocations.begin(),
- e = SymbolRelocations.end();
+void RuntimeDyldImpl::resolveExternalSymbols() {
+ StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin(),
+ e = ExternalSymbolRelocations.end();
for (; i != e; i++) {
StringRef Name = i->first();
RelocationList &Relocs = i->second;
- StringMap<SymbolLoc>::const_iterator Loc = SymbolTable.find(Name);
- if (Loc == SymbolTable.end()) {
+ 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(),
<< "\n");
resolveRelocationList(Relocs, (uintptr_t)Addr);
} else {
- // Change the relocation to be section relative rather than symbol
- // relative and move it to the resolved relocation list.
- DEBUG(dbgs() << "Resolving symbol '" << Name << "'\n");
- for (int i = 0, e = Relocs.size(); i != e; ++i) {
- RelocationEntry Entry = Relocs[i];
- Entry.Addend += Loc->second.second;
- Relocations[Loc->second.first].push_back(Entry);
- }
- Relocs.clear();
+ 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;
}
delete Dyld;
}
-bool RuntimeDyld::loadObject(MemoryBuffer *InputBuffer) {
+ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *InputBuffer) {
if (!Dyld) {
sys::LLVMFileType type = sys::IdentifyFileType(
InputBuffer->getBufferStart(),
return Dyld->getSymbolAddress(Name);
}
+uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
+ return Dyld->getSymbolLoadAddress(Name);
+}
+
void RuntimeDyld::resolveRelocations() {
Dyld->resolveRelocations();
}
Dyld->reassignSectionAddress(SectionID, Addr);
}
-void RuntimeDyld::mapSectionAddress(void *LocalAddress,
+void RuntimeDyld::mapSectionAddress(const void *LocalAddress,
uint64_t TargetAddress) {
Dyld->mapSectionAddress(LocalAddress, TargetAddress);
}
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