diff --git a/llvm/include/llvm/MC/MCContext.h b/llvm/include/llvm/MC/MCContext.h
--- a/llvm/include/llvm/MC/MCContext.h
+++ b/llvm/include/llvm/MC/MCContext.h
@@ -49,6 +49,7 @@
 class MCRegisterInfo;
 class MCSection;
 class MCSectionCOFF;
+class MCSectionDXContainer;
 class MCSectionELF;
 class MCSectionGOFF;
 class MCSectionMachO;
@@ -128,6 +129,7 @@
   BumpPtrAllocator Allocator;
 
   SpecificBumpPtrAllocator<MCSectionCOFF> COFFAllocator;
+  SpecificBumpPtrAllocator<MCSectionDXContainer> DXCAllocator;
   SpecificBumpPtrAllocator<MCSectionELF> ELFAllocator;
   SpecificBumpPtrAllocator<MCSectionMachO> MachOAllocator;
   SpecificBumpPtrAllocator<MCSectionGOFF> GOFFAllocator;
@@ -342,6 +344,7 @@
   std::map<std::string, MCSectionGOFF *> GOFFUniquingMap;
   std::map<WasmSectionKey, MCSectionWasm *> WasmUniquingMap;
   std::map<XCOFFSectionKey, MCSectionXCOFF *> XCOFFUniquingMap;
+  StringMap<MCSectionDXContainer *> DXCUniquingMap;
   StringMap<bool> RelSecNames;
 
   SpecificBumpPtrAllocator<MCSubtargetInfo> MCSubtargetAllocator;
@@ -659,6 +662,9 @@
   MCSectionWasm *getWasmSection(const Twine &Section, SectionKind K,
                                 unsigned Flags, const MCSymbolWasm *Group,
                                 unsigned UniqueID, const char *BeginSymName);
+  
+  /// Get the section for the provided Section name
+  MCSectionDXContainer *getDXContainerSection(StringRef Section, SectionKind K);
 
   bool hasXCOFFSection(StringRef Section,
                        XCOFF::CsectProperties CsectProp) const;
diff --git a/llvm/include/llvm/MC/MCDXContainerStreamer.h b/llvm/include/llvm/MC/MCDXContainerStreamer.h
new file mode 100644
--- /dev/null
+++ b/llvm/include/llvm/MC/MCDXContainerStreamer.h
@@ -0,0 +1,49 @@
+//===- MCDXContainerStreamer.h - MCDXContainerStreamer Interface ---*- C++ ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Overrides MCObjectStreamer to disable all unnecessary features with stubs.
+// The DXContainer format isn't a fully featured object format. It doesn't
+// support symbols, and initially it will not support instruction data since it
+// is used as a bitcode container for DXIL.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCDXCONTAINERSTREAMER_H
+#define LLVM_MC_MCDXCONTAINERSTREAMER_H
+
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCObjectStreamer.h"
+#include "llvm/MC/MCObjectWriter.h"
+
+namespace llvm {
+class MCAssembler;
+class MCExpr;
+class MCInst;
+class raw_ostream;
+
+class MCDXContainerStreamer : public MCObjectStreamer {
+public:
+  MCDXContainerStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
+                        std::unique_ptr<MCObjectWriter> OW,
+                        std::unique_ptr<MCCodeEmitter> Emitter)
+      : MCObjectStreamer(Context, std::move(TAB), std::move(OW),
+                         std::move(Emitter)) {}
+
+  bool emitSymbolAttribute(MCSymbol *, MCSymbolAttr) override { return false; }
+  void emitCommonSymbol(MCSymbol *, uint64_t, unsigned) override {}
+  void emitZerofill(MCSection *, MCSymbol *Symbol = nullptr, uint64_t Size = 0,
+                    unsigned ByteAlignment = 0, SMLoc Loc = SMLoc()) override {}
+
+private:
+  void emitInstToData(const MCInst &, const MCSubtargetInfo &) override;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_MC_MCDXCONTAINERSTREAMER_H
diff --git a/llvm/include/llvm/MC/MCDXContainerWriter.h b/llvm/include/llvm/MC/MCDXContainerWriter.h
new file mode 100644
--- /dev/null
+++ b/llvm/include/llvm/MC/MCDXContainerWriter.h
@@ -0,0 +1,46 @@
+//===- llvm/MC/MCDXContainerWriter.h - DXContainer Writer -*- C++ -------*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCDXCONTAINERWRITER_H
+#define LLVM_MC_MCDXCONTAINERWRITER_H
+
+#include "llvm/ADT/Triple.h"
+#include "llvm/MC/MCObjectWriter.h"
+
+namespace llvm {
+
+class raw_pwrite_stream;
+
+class MCDXContainerTargetWriter : public MCObjectTargetWriter {
+
+protected:
+  MCDXContainerTargetWriter() {}
+
+public:
+  virtual ~MCDXContainerTargetWriter();
+
+  Triple::ObjectFormatType getFormat() const override {
+    return Triple::DXContainer;
+  }
+  static bool classof(const MCObjectTargetWriter *W) {
+    return W->getFormat() == Triple::DXContainer;
+  }
+};
+
+/// Construct a new DXContainer writer instance.
+///
+/// \param MOTW - The target specific DXContainer writer subclass.
+/// \param OS - The stream to write to.
+/// \returns The constructed object writer.
+std::unique_ptr<MCObjectWriter>
+createDXContainerObjectWriter(std::unique_ptr<MCDXContainerTargetWriter> MOTW,
+                              raw_pwrite_stream &OS);
+
+} // end namespace llvm
+
+#endif // LLVM_MC_MCDXCONTAINERWRITER_H
diff --git a/llvm/include/llvm/MC/MCObjectFileInfo.h b/llvm/include/llvm/MC/MCObjectFileInfo.h
--- a/llvm/include/llvm/MC/MCObjectFileInfo.h
+++ b/llvm/include/llvm/MC/MCObjectFileInfo.h
@@ -459,6 +459,7 @@
   void initSPIRVMCObjectFileInfo(const Triple &T);
   void initWasmMCObjectFileInfo(const Triple &T);
   void initXCOFFMCObjectFileInfo(const Triple &T);
+  void initDXContainerObjectFileInfo(const Triple &T);
   MCSection *getDwarfComdatSection(const char *Name, uint64_t Hash) const;
 
 public:
diff --git a/llvm/include/llvm/MC/MCSection.h b/llvm/include/llvm/MC/MCSection.h
--- a/llvm/include/llvm/MC/MCSection.h
+++ b/llvm/include/llvm/MC/MCSection.h
@@ -48,6 +48,7 @@
     SV_Wasm,
     SV_XCOFF,
     SV_SPIRV,
+    SV_DXContainer,
   };
 
   /// Express the state of bundle locked groups while emitting code.
diff --git a/llvm/include/llvm/MC/MCSectionDXContainer.h b/llvm/include/llvm/MC/MCSectionDXContainer.h
new file mode 100644
--- /dev/null
+++ b/llvm/include/llvm/MC/MCSectionDXContainer.h
@@ -0,0 +1,39 @@
+//===- MCSectionDXContainer.h - DXContainer MC Sections ---------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the MCSectionDXContainer class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCSECTIONDXCONTAINER_H
+#define LLVM_MC_MCSECTIONDXCONTAINER_H
+
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/SectionKind.h"
+
+namespace llvm {
+
+class MCSymbol;
+
+class MCSectionDXContainer final : public MCSection {
+  friend class MCContext;
+
+  MCSectionDXContainer(StringRef Name, SectionKind K, MCSymbol *Begin)
+      : MCSection(SV_DXContainer, Name, K, Begin) {}
+
+public:
+  ~MCSectionDXContainer() = default;
+  void printSwitchToSection(const MCAsmInfo &, const Triple &, raw_ostream &,
+                            const MCExpr *) const override;
+  bool useCodeAlign() const override { return false; }
+  bool isVirtualSection() const override { return false; }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_MC_MCSECTIONDXCONTAINER_H
diff --git a/llvm/include/llvm/MC/TargetRegistry.h b/llvm/include/llvm/MC/TargetRegistry.h
--- a/llvm/include/llvm/MC/TargetRegistry.h
+++ b/llvm/include/llvm/MC/TargetRegistry.h
@@ -114,6 +114,11 @@
                                 std::unique_ptr<MCObjectWriter> &&OW,
                                 std::unique_ptr<MCCodeEmitter> &&CE,
                                 bool RelaxAll);
+MCStreamer *createDXContainerStreamer(MCContext &Ctx,
+                                      std::unique_ptr<MCAsmBackend> &&TAB,
+                                      std::unique_ptr<MCObjectWriter> &&OW,
+                                      std::unique_ptr<MCCodeEmitter> &&CE,
+                                      bool RelaxAll);
 
 MCRelocationInfo *createMCRelocationInfo(const Triple &TT, MCContext &Ctx);
 
@@ -211,6 +216,12 @@
                       std::unique_ptr<MCAsmBackend> &&TAB,
                       std::unique_ptr<MCObjectWriter> &&OW,
                       std::unique_ptr<MCCodeEmitter> &&Emitter, bool RelaxAll);
+  
+  using DXContainerStreamerCtorTy =
+      MCStreamer *(*)(const Triple &T, MCContext &Ctx,
+                      std::unique_ptr<MCAsmBackend> &&TAB,
+                      std::unique_ptr<MCObjectWriter> &&OW,
+                      std::unique_ptr<MCCodeEmitter> &&Emitter, bool RelaxAll);
 
   using NullTargetStreamerCtorTy = MCTargetStreamer *(*)(MCStreamer &S);
   using AsmTargetStreamerCtorTy = MCTargetStreamer *(*)(
@@ -313,6 +324,7 @@
   WasmStreamerCtorTy WasmStreamerCtorFn = nullptr;
   XCOFFStreamerCtorTy XCOFFStreamerCtorFn = nullptr;
   SPIRVStreamerCtorTy SPIRVStreamerCtorFn = nullptr;
+  DXContainerStreamerCtorTy DXContainerStreamerCtorFn = nullptr;
 
   /// Construction function for this target's null TargetStreamer, if
   /// registered (default = nullptr).
@@ -541,8 +553,6 @@
     switch (T.getObjectFormat()) {
     case Triple::UnknownObjectFormat:
       llvm_unreachable("Unknown object format");
-    case Triple::DXContainer:
-      llvm_unreachable("DXContainer is unsupported through MC");
     case Triple::COFF:
       assert(T.isOSWindows() && "only Windows COFF is supported");
       S = COFFStreamerCtorFn(Ctx, std::move(TAB), std::move(OW),
@@ -593,6 +603,14 @@
         S = createSPIRVStreamer(Ctx, std::move(TAB), std::move(OW),
                                 std::move(Emitter), RelaxAll);
       break;
+    case Triple::DXContainer:
+      if (DXContainerStreamerCtorFn)
+        S = DXContainerStreamerCtorFn(T, Ctx, std::move(TAB), std::move(OW),
+                              std::move(Emitter), RelaxAll);
+      else
+        S = createDXContainerStreamer(Ctx, std::move(TAB), std::move(OW),
+                                      std::move(Emitter), RelaxAll);
+      break;
     }
     if (ObjectTargetStreamerCtorFn)
       ObjectTargetStreamerCtorFn(*S, STI);
@@ -977,6 +995,10 @@
     T.SPIRVStreamerCtorFn = Fn;
   }
 
+  static void RegisterDXContainerStreamer(Target &T, Target::DXContainerStreamerCtorTy Fn) {
+    T.DXContainerStreamerCtorFn = Fn;
+  }
+
   static void RegisterWasmStreamer(Target &T, Target::WasmStreamerCtorTy Fn) {
     T.WasmStreamerCtorFn = Fn;
   }
diff --git a/llvm/lib/MC/CMakeLists.txt b/llvm/lib/MC/CMakeLists.txt
--- a/llvm/lib/MC/CMakeLists.txt
+++ b/llvm/lib/MC/CMakeLists.txt
@@ -16,6 +16,8 @@
   MCCodeView.cpp
   MCContext.cpp
   MCDwarf.cpp
+  MCDXContainerStreamer.cpp
+  MCDXContainerWriter.cpp
   MCELFObjectTargetWriter.cpp
   MCELFStreamer.cpp
   MCExpr.cpp
@@ -38,6 +40,7 @@
   MCSchedule.cpp
   MCSection.cpp
   MCSectionCOFF.cpp
+  MCSectionDXContainer.cpp
   MCSectionELF.cpp
   MCSectionMachO.cpp
   MCSectionWasm.cpp
diff --git a/llvm/lib/MC/MCAsmBackend.cpp b/llvm/lib/MC/MCAsmBackend.cpp
--- a/llvm/lib/MC/MCAsmBackend.cpp
+++ b/llvm/lib/MC/MCAsmBackend.cpp
@@ -9,6 +9,7 @@
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/STLArrayExtras.h"
+#include "llvm/MC/MCDXContainerWriter.h"
 #include "llvm/MC/MCELFObjectWriter.h"
 #include "llvm/MC/MCFixupKindInfo.h"
 #include "llvm/MC/MCMachObjectWriter.h"
@@ -49,6 +50,9 @@
   case Triple::XCOFF:
     return createXCOFFObjectWriter(
         cast<MCXCOFFObjectTargetWriter>(std::move(TW)), OS);
+  case Triple::DXContainer:
+    return createDXContainerObjectWriter(
+        cast<MCDXContainerTargetWriter>(std::move(TW)), OS);
   default:
     llvm_unreachable("unexpected object format");
   }
diff --git a/llvm/lib/MC/MCContext.cpp b/llvm/lib/MC/MCContext.cpp
--- a/llvm/lib/MC/MCContext.cpp
+++ b/llvm/lib/MC/MCContext.cpp
@@ -26,6 +26,7 @@
 #include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCLabel.h"
 #include "llvm/MC/MCSectionCOFF.h"
+#include "llvm/MC/MCSectionDXContainer.h"
 #include "llvm/MC/MCSectionELF.h"
 #include "llvm/MC/MCSectionGOFF.h"
 #include "llvm/MC/MCSectionMachO.h"
@@ -145,6 +146,7 @@
 
   // Call the destructors so the fragments are freed
   COFFAllocator.DestroyAll();
+  DXCAllocator.DestroyAll();
   ELFAllocator.DestroyAll();
   GOFFAllocator.DestroyAll();
   MachOAllocator.DestroyAll();
@@ -176,6 +178,7 @@
   COFFUniquingMap.clear();
   WasmUniquingMap.clear();
   XCOFFUniquingMap.clear();
+  DXCUniquingMap.clear();
 
   ELFEntrySizeMap.clear();
   ELFSeenGenericMergeableSections.clear();
@@ -838,6 +841,29 @@
   return Result;
 }
 
+MCSectionDXContainer *MCContext::getDXContainerSection(StringRef Section,
+                                                       SectionKind K) {
+  // Do the lookup, if we have a hit, return it.
+  auto ItInsertedPair = DXCUniquingMap.try_emplace(Section);
+  if (!ItInsertedPair.second)
+    return ItInsertedPair.first->second;
+
+  auto MapIt = ItInsertedPair.first;
+  // Grab the name from the StringMap. Since the Section is going to keep a
+  // copy of this StringRef we need to make sure the underlying string stays
+  // alive as long as we need it.
+  StringRef Name = MapIt->first();
+  MapIt->second =
+      new (DXCAllocator.Allocate()) MCSectionDXContainer(Name, K, nullptr);
+
+  // The first fragment will store the header
+  auto *F = new MCDataFragment();
+  MapIt->second->getFragmentList().insert(MapIt->second->begin(), F);
+  F->setParent(MapIt->second);
+
+  return MapIt->second;
+}
+
 MCSubtargetInfo &MCContext::getSubtargetCopy(const MCSubtargetInfo &STI) {
   return *new (MCSubtargetAllocator.Allocate()) MCSubtargetInfo(STI);
 }
diff --git a/llvm/lib/MC/MCDXContainerStreamer.cpp b/llvm/lib/MC/MCDXContainerStreamer.cpp
new file mode 100644
--- /dev/null
+++ b/llvm/lib/MC/MCDXContainerStreamer.cpp
@@ -0,0 +1,31 @@
+//===- lib/MC/MCDXContainerStreamer.cpp - DXContainer Impl ----*- C++ -*---===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the object streamer for DXContainer files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCDXContainerStreamer.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/TargetRegistry.h"
+
+using namespace llvm;
+
+void MCDXContainerStreamer::emitInstToData(const MCInst &,
+                                           const MCSubtargetInfo &) {}
+
+MCStreamer *llvm::createDXContainerStreamer(
+    MCContext &Context, std::unique_ptr<MCAsmBackend> &&MAB,
+    std::unique_ptr<MCObjectWriter> &&OW, std::unique_ptr<MCCodeEmitter> &&CE,
+    bool RelaxAll) {
+  auto *S = new MCDXContainerStreamer(Context, std::move(MAB), std::move(OW),
+                                      std::move(CE));
+  if (RelaxAll)
+    S->getAssembler().setRelaxAll(true);
+  return S;
+}
diff --git a/llvm/lib/MC/MCDXContainerWriter.cpp b/llvm/lib/MC/MCDXContainerWriter.cpp
new file mode 100644
--- /dev/null
+++ b/llvm/lib/MC/MCDXContainerWriter.cpp
@@ -0,0 +1,143 @@
+//===- llvm/MC/MCDXContainerWriter.cpp - DXContainer Writer -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCDXContainerWriter.h"
+#include "llvm/BinaryFormat/DXContainer.h"
+#include "llvm/MC/MCAsmLayout.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCValue.h"
+#include "llvm/Support/Alignment.h"
+#include "llvm/Support/EndianStream.h"
+
+using namespace llvm;
+
+MCDXContainerTargetWriter::~MCDXContainerTargetWriter() {}
+
+namespace {
+class DXContainerObjectWriter : public MCObjectWriter {
+  ::support::endian::Writer W;
+
+  /// The target specific DXContainer writer instance.
+  std::unique_ptr<MCDXContainerTargetWriter> TargetObjectWriter;
+
+public:
+  DXContainerObjectWriter(std::unique_ptr<MCDXContainerTargetWriter> MOTW,
+                          raw_pwrite_stream &OS)
+      : W(OS, support::little), TargetObjectWriter(std::move(MOTW)) {}
+
+  ~DXContainerObjectWriter() override {}
+
+private:
+  void recordRelocation(MCAssembler &Asm, const MCAsmLayout &Layout,
+                        const MCFragment *Fragment, const MCFixup &Fixup,
+                        MCValue Target, uint64_t &FixedValue) override {}
+
+  void executePostLayoutBinding(MCAssembler &Asm,
+                                const MCAsmLayout &Layout) override {}
+
+  uint64_t writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
+};
+} // namespace
+
+uint64_t DXContainerObjectWriter::writeObject(MCAssembler &Asm,
+                                              const MCAsmLayout &Layout) {
+  // Start the file size as the header plus the size of the part offsets.
+  // Presently DXContainer files usually contain 7-10 parts. Reserving space for
+  // 16 part offsets gives us a little room for growth.
+  llvm::SmallVector<uint64_t, 16> PartOffsets;
+  uint64_t PartOffset = 0;
+  for (const MCSection &Sec : Asm) {
+    uint64_t SectionSize = Layout.getSectionAddressSize(&Sec);
+    // Skip empty sections...
+    if (SectionSize == 0)
+      continue;
+
+    assert(SectionSize < std::numeric_limits<uint32_t>::max() &&
+           "Section size too large for DXContainer");
+
+    PartOffsets.push_back(PartOffset);
+    PartOffset += sizeof(dxbc::PartHeader) + SectionSize;
+    PartOffset = alignTo(PartOffset, Align(4ul));
+  }
+  assert(PartOffset < std::numeric_limits<uint32_t>::max() &&
+         "Part data too large for DXContainer");
+
+  uint64_t PartStart =
+      sizeof(dxbc::Header) + (PartOffsets.size() * sizeof(uint32_t));
+  uint64_t FileSize = PartStart + PartOffset;
+  assert(FileSize < std::numeric_limits<uint32_t>::max() &&
+         "File size too large for DXContainer");
+
+  // Write the header
+  W.write<char>({'D', 'X', 'B', 'C'});
+  // Hash 16-bytes of 0's
+  W.OS.write_zeros(16);
+  // Version
+  W.write<uint16_t>(1u);
+  W.write<uint16_t>(0u);
+  // FileSize
+  W.write<uint32_t>(static_cast<uint32_t>(FileSize));
+  // Part count
+  W.write<uint32_t>(static_cast<uint32_t>(PartOffsets.size()));
+  // Offsets
+  for (uint64_t Offset : PartOffsets)
+    W.write<uint32_t>(static_cast<uint32_t>(PartStart + Offset));
+
+  for (const MCSection &Sec : Asm) {
+    uint64_t SectionSize = Layout.getSectionAddressSize(&Sec);
+    // Skip empty sections...
+    if (SectionSize == 0)
+      continue;
+
+    unsigned Start = W.OS.tell();
+    // Write section header
+    W.write<char>(ArrayRef<char>(Sec.getName().data(), 4));
+
+    uint64_t PartSize = SectionSize + sizeof(dxbc::PartHeader);
+
+    if (Sec.getName() == "DXIL")
+      PartSize += sizeof(dxbc::ProgramHeader);
+    // DXContainer parts should be 4-byte aligned
+    PartSize = alignTo(PartSize, Align(4));
+    W.write<uint32_t>(static_cast<uint32_t>(PartSize));
+    if (Sec.getName() == "DXIL") {
+      dxbc::ProgramHeader Header;
+      bzero(reinterpret_cast<void *>(&Header), sizeof(dxbc::ProgramHeader));
+
+      const Triple &TT = Asm.getContext().getTargetTriple();
+      VersionTuple Version = TT.getOSVersion();
+      Header.MajorVersion = static_cast<uint8_t>(Version.getMajor());
+      if (Version.getMinor().hasValue())
+        Header.MinorVersion = static_cast<uint8_t>(*Version.getMinor());
+      if (TT.hasEnvironment())
+        Header.ShaderKind =
+            static_cast<uint16_t>(TT.getEnvironment() - Triple::Pixel);
+
+      // The program header's size field is in 32-bit words.
+      Header.Size = (SectionSize + sizeof(dxbc::ProgramHeader) + 3) / 4;
+      memcpy(Header.Bitcode.Magic, "DXIL", 4);
+      Header.Bitcode.Offset = sizeof(dxbc::BitcodeHeader);
+      Header.Bitcode.Size = SectionSize;
+      if (sys::IsBigEndianHost)
+        Header.swapBytes();
+      W.write<char>(ArrayRef<char>(reinterpret_cast<char *>(&Header),
+                                   sizeof(dxbc::ProgramHeader)));
+    }
+    Asm.writeSectionData(W.OS, &Sec, Layout);
+    unsigned Size = W.OS.tell() - Start;
+    W.OS.write_zeros(offsetToAlignment(Size, Align(4)));
+  }
+  return 0;
+}
+
+std::unique_ptr<MCObjectWriter> llvm::createDXContainerObjectWriter(
+    std::unique_ptr<MCDXContainerTargetWriter> MOTW, raw_pwrite_stream &OS) {
+  return std::make_unique<DXContainerObjectWriter>(std::move(MOTW), OS);
+}
diff --git a/llvm/lib/MC/MCObjectFileInfo.cpp b/llvm/lib/MC/MCObjectFileInfo.cpp
--- a/llvm/lib/MC/MCObjectFileInfo.cpp
+++ b/llvm/lib/MC/MCObjectFileInfo.cpp
@@ -16,6 +16,7 @@
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCSectionCOFF.h"
+#include "llvm/MC/MCSectionDXContainer.h"
 #include "llvm/MC/MCSectionELF.h"
 #include "llvm/MC/MCSectionGOFF.h"
 #include "llvm/MC/MCSectionMachO.h"
@@ -1009,6 +1010,11 @@
       /* MultiSymbolsAllowed */ true, ".dwmac", XCOFF::SSUBTYP_DWMAC);
 }
 
+void MCObjectFileInfo::initDXContainerObjectFileInfo(const Triple &T) {
+  // At the moment the DXBC section should end up empty.
+  TextSection = Ctx->getDXContainerSection("DXBC", SectionKind::getText());
+}
+
 MCObjectFileInfo::~MCObjectFileInfo() = default;
 
 void MCObjectFileInfo::initMCObjectFileInfo(MCContext &MCCtx, bool PIC,
@@ -1057,6 +1063,7 @@
     initXCOFFMCObjectFileInfo(TheTriple);
     break;
   case MCContext::IsDXContainer:
+    initDXContainerObjectFileInfo(TheTriple);
     break;
   }
 }
diff --git a/llvm/lib/MC/MCSectionDXContainer.cpp b/llvm/lib/MC/MCSectionDXContainer.cpp
new file mode 100644
--- /dev/null
+++ b/llvm/lib/MC/MCSectionDXContainer.cpp
@@ -0,0 +1,15 @@
+//===- lib/MC/MCSectionDXContainer.cpp - DXContainer Section --------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCSectionDXContainer.h"
+
+using namespace llvm;
+
+void MCSectionDXContainer::printSwitchToSection(const MCAsmInfo &,
+                                                const Triple &, raw_ostream &,
+                                                const MCExpr *) const {}