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-rw-r--r--lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp128
1 files changed, 91 insertions, 37 deletions
diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
index 7b32db7..f0bd4e3 100644
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
@@ -17,18 +17,22 @@
#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/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 {
+StringRef RuntimeDyldImpl::getEHFrameSection() {
+ return StringRef();
+}
+
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
// First, resolve relocations associated with external symbols.
@@ -143,6 +147,7 @@ ObjectImage *RuntimeDyldImpl::loadObject(ObjectBuffer *InputBuffer) {
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)) {
@@ -150,7 +155,8 @@ ObjectImage *RuntimeDyldImpl::loadObject(ObjectBuffer *InputBuffer) {
// 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;
}
@@ -174,7 +180,7 @@ void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
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
@@ -211,11 +217,25 @@ unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
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));
@@ -234,6 +254,12 @@ unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
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();
@@ -286,8 +312,7 @@ unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
<< "\n");
}
- Sections.push_back(SectionEntry(Name, Addr, Allocate, DataSize,
- (uintptr_t)pData));
+ Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
return SectionID;
}
@@ -330,7 +355,25 @@ void RuntimeDyldImpl::addRelocationForSymbol(const RelocationEntry &RE,
}
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;
@@ -371,6 +414,13 @@ uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
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;
}
@@ -451,33 +501,33 @@ RuntimeDyld::~RuntimeDyld() {
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:
+ report_fatal_error("Incompatible object format!");
}
} else {
if (!Dyld->isCompatibleFormat(InputBuffer))
@@ -513,4 +563,8 @@ StringRef RuntimeDyld::getErrorString() {
return Dyld->getErrorString();
}
+StringRef RuntimeDyld::getEHFrameSection() {
+ return Dyld->getEHFrameSection();
+}
+
} // end namespace llvm
generated by cgit v1.1 at 2025-08-18 02:35:45 +0000