1 files changed, 78 insertions, 0 deletions
diff --git a/tools/yaml2obj/yaml2elf.cpp b/tools/yaml2obj/yaml2elf.cpp
new file mode 100644
index 0000000..45ccb62
--- /dev/null
+++ b/tools/yaml2obj/yaml2elf.cpp
@@ -0,0 +1,78 @@
+//===- yaml2elf - Convert YAML to a ELF object file -----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief The ELF component of yaml2obj.
+///
+//===----------------------------------------------------------------------===//
+
+#include "yaml2obj.h"
+#include "llvm/Object/ELF.h"
+#include "llvm/Object/ELFYAML.h"
+#include "llvm/Support/ELF.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/YAMLTraits.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+template <class ELFT>
+static void writeELF(raw_ostream &OS, const ELFYAML::Object &Doc) {
+  const ELFYAML::FileHeader &Hdr = Doc.Header;
+  using namespace llvm::ELF;
+  using namespace llvm::object;
+  typename ELFObjectFile<ELFT>::Elf_Ehdr Header;
+  memset(&Header, 0, sizeof(Header));
+  Header.e_ident[EI_MAG0] = 0x7f;
+  Header.e_ident[EI_MAG1] = 'E';
+  Header.e_ident[EI_MAG2] = 'L';
+  Header.e_ident[EI_MAG3] = 'F';
+  Header.e_ident[EI_CLASS] = ELFT::Is64Bits ? ELFCLASS64 : ELFCLASS32;
+  bool IsLittleEndian = ELFT::TargetEndianness == support::little;
+  Header.e_ident[EI_DATA] = IsLittleEndian ? ELFDATA2LSB : ELFDATA2MSB;
+
+  Header.e_ident[EI_VERSION] = EV_CURRENT;
+
+  // TODO: Implement ELF_ELFOSABI enum.
+  Header.e_ident[EI_OSABI] = ELFOSABI_NONE;
+  // TODO: Implement ELF_ABIVERSION enum.
+  Header.e_ident[EI_ABIVERSION] = 0;
+  Header.e_type = Hdr.Type;
+  Header.e_machine = Hdr.Machine;
+  Header.e_version = EV_CURRENT;
+  Header.e_entry = Hdr.Entry;
+  Header.e_ehsize = sizeof(Header);
+
+  // TODO: Section headers and program headers.
+
+  OS.write((const char *)&Header, sizeof(Header));
+}
+
+int yaml2elf(llvm::raw_ostream &Out, llvm::MemoryBuffer *Buf) {
+  yaml::Input YIn(Buf->getBuffer());
+  ELFYAML::Object Doc;
+  YIn >> Doc;
+  if (YIn.error()) {
+    errs() << "yaml2obj: Failed to parse YAML file!\n";
+    return 1;
+  }
+  if (Doc.Header.Class == ELFYAML::ELF_ELFCLASS(ELF::ELFCLASS64)) {
+    if (Doc.Header.Data == ELFYAML::ELF_ELFDATA(ELF::ELFDATA2LSB))
+      writeELF<object::ELFType<support::little, 8, true> >(outs(), Doc);
+    else
+      writeELF<object::ELFType<support::big, 8, true> >(outs(), Doc);
+  } else {
+    if (Doc.Header.Data == ELFYAML::ELF_ELFDATA(ELF::ELFDATA2LSB))
+      writeELF<object::ELFType<support::little, 4, false> >(outs(), Doc);
+    else
+      writeELF<object::ELFType<support::big, 4, false> >(outs(), Doc);
+  }
+
+  return 0;
+}