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//===-------------- ELF.cpp - JIT linker function for ELF -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// ELF jit-link function.
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/JITLink/ELF.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/ExecutionEngine/JITLink/ELF_x86_64.h"
#include "llvm/Object/ELF.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MemoryBuffer.h"
#include <cstring>
using namespace llvm;
#define DEBUG_TYPE "jitlink"
namespace llvm {
namespace jitlink {
Expected<uint16_t> readTargetMachineArch(StringRef Buffer) {
const char *Data = Buffer.data();
if (Data[ELF::EI_DATA] == ELF::ELFDATA2LSB) {
if (Data[ELF::EI_CLASS] == ELF::ELFCLASS64) {
if (auto File = llvm::object::ELF64LEFile::create(Buffer)) {
return File->getHeader().e_machine;
} else {
return File.takeError();
}
} else if (Data[ELF::EI_CLASS] == ELF::ELFCLASS32) {
if (auto File = llvm::object::ELF32LEFile::create(Buffer)) {
return File->getHeader().e_machine;
} else {
return File.takeError();
}
}
}
return ELF::EM_NONE;
}
Expected<std::unique_ptr<LinkGraph>>
createLinkGraphFromELFObject(MemoryBufferRef ObjectBuffer) {
StringRef Buffer = ObjectBuffer.getBuffer();
if (Buffer.size() < ELF::EI_MAG3 + 1)
return make_error<JITLinkError>("Truncated ELF buffer");
if (memcmp(Buffer.data(), ELF::ElfMagic, strlen(ELF::ElfMagic)) != 0)
return make_error<JITLinkError>("ELF magic not valid");
Expected<uint16_t> TargetMachineArch = readTargetMachineArch(Buffer);
if (!TargetMachineArch)
return TargetMachineArch.takeError();
switch (*TargetMachineArch) {
case ELF::EM_X86_64:
return createLinkGraphFromELFObject_x86_64(std::move(ObjectBuffer));
default:
return make_error<JITLinkError>(
"Unsupported target machine architecture in ELF object " +
ObjectBuffer.getBufferIdentifier());
}
}
void link_ELF(std::unique_ptr<LinkGraph> G,
std::unique_ptr<JITLinkContext> Ctx) {
switch (G->getTargetTriple().getArch()) {
case Triple::x86_64:
link_ELF_x86_64(std::move(G), std::move(Ctx));
return;
default:
Ctx->notifyFailed(make_error<JITLinkError>(
"Unsupported target machine architecture in ELF link graph " +
G->getName()));
return;
}
}
} // end namespace jitlink
} // end namespace llvm
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