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-rw-r--r--lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp143
1 files changed, 85 insertions, 58 deletions
diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
index d47287b..c5b807b 100644
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
@@ -12,9 +12,12 @@
//===----------------------------------------------------------------------===//
#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;
@@ -26,16 +29,6 @@ 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
-
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
// First, resolve relocations associated with external symbols.
@@ -44,11 +37,15 @@ 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);
}
}
-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) {
@@ -61,14 +58,11 @@ void RuntimeDyldImpl::mapSectionAddress(void *LocalAddress,
// Subclasses can implement this method to create specialized image instances.
// The caller owns 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;
+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!");
@@ -80,9 +74,9 @@ bool RuntimeDyldImpl::loadObject(const MemoryBuffer *InputBuffer) {
// 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;
@@ -102,38 +96,35 @@ bool RuntimeDyldImpl::loadObject(const MemoryBuffer *InputBuffer) {
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_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");
@@ -178,9 +169,7 @@ bool RuntimeDyldImpl::loadObject(const MemoryBuffer *InputBuffer) {
}
}
- handleObjectLoaded(obj.take());
-
- return false;
+ return obj.take();
}
void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
@@ -190,11 +179,11 @@ void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
// 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
@@ -205,11 +194,20 @@ void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
// 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;
}
@@ -236,11 +234,15 @@ 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();
@@ -253,7 +255,7 @@ unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
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!");
@@ -268,6 +270,7 @@ unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
memcpy(Addr, pData, DataSize);
DEBUG(dbgs() << "emitSection SectionID: " << SectionID
+ << " Name: " << Name
<< " obj addr: " << format("%p", pData)
<< " new addr: " << format("%p", Addr)
<< " DataSize: " << DataSize
@@ -283,6 +286,7 @@ unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
Allocate = 0;
Addr = 0;
DEBUG(dbgs() << "emitSection SectionID: " << SectionID
+ << " Name: " << Name
<< " obj addr: " << format("%p", data.data())
<< " new addr: 0"
<< " DataSize: " << DataSize
@@ -291,7 +295,8 @@ unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
<< "\n");
}
- Sections.push_back(SectionEntry(Addr, Allocate, DataSize,(uintptr_t)pData));
+ Sections.push_back(SectionEntry(Name, Addr, Allocate, DataSize,
+ (uintptr_t)pData));
return SectionID;
}
@@ -340,7 +345,7 @@ uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
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).
@@ -357,6 +362,24 @@ uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
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;
}
@@ -367,32 +390,30 @@ void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
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");
+ // 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.RelType, RE.Addend);
+ resolveRelocation(Sections[RE.SectionID], RE.Offset,
+ Value, RE.RelType, RE.Addend);
}
}
@@ -429,6 +450,12 @@ void RuntimeDyldImpl::resolveExternalSymbols() {
//===----------------------------------------------------------------------===//
// 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;
}
@@ -437,7 +464,7 @@ RuntimeDyld::~RuntimeDyld() {
delete Dyld;
}
-bool RuntimeDyld::loadObject(MemoryBuffer *InputBuffer) {
+ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *InputBuffer) {
if (!Dyld) {
sys::LLVMFileType type = sys::IdentifyFileType(
InputBuffer->getBufferStart(),
@@ -492,7 +519,7 @@ void RuntimeDyld::reassignSectionAddress(unsigned SectionID,
Dyld->reassignSectionAddress(SectionID, Addr);
}
-void RuntimeDyld::mapSectionAddress(void *LocalAddress,
+void RuntimeDyld::mapSectionAddress(const void *LocalAddress,
uint64_t TargetAddress) {
Dyld->mapSectionAddress(LocalAddress, TargetAddress);
}
generated by cgit v1.1 at 2025-11-11 06:32:47 +0000