92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
|
//===-------------- 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
|