Index: lib/Target/AArch64/AArch64AsmPrinter.cpp
===================================================================
--- lib/Target/AArch64/AArch64AsmPrinter.cpp
+++ lib/Target/AArch64/AArch64AsmPrinter.cpp
@@ -28,6 +28,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/ADT/Twine.h"
+#include "llvm/BinaryFormat/COFF.h"
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineFunction.h"
@@ -109,12 +110,33 @@
     AU.setPreservesAll();
   }
 
-  bool runOnMachineFunction(MachineFunction &F) override {
-    AArch64FI = F.getInfo<AArch64FunctionInfo>();
-    STI = static_cast<const AArch64Subtarget*>(&F.getSubtarget());
-    bool Result = AsmPrinter::runOnMachineFunction(F);
+  bool runOnMachineFunction(MachineFunction &MF) override {
+    AArch64FI = MF.getInfo<AArch64FunctionInfo>();
+    STI = static_cast<const AArch64Subtarget*>(&MF.getSubtarget());
+
+    SetupMachineFunction(MF);
+
+    if (STI->isTargetCOFF()) {
+      bool Internal = MF.getFunction().hasInternalLinkage();
+      COFF::SymbolStorageClass Scl = Internal ? COFF::IMAGE_SYM_CLASS_STATIC
+                                              : COFF::IMAGE_SYM_CLASS_EXTERNAL;
+      int Type =
+        COFF::IMAGE_SYM_DTYPE_FUNCTION << COFF::SCT_COMPLEX_TYPE_SHIFT;
+
+      OutStreamer->BeginCOFFSymbolDef(CurrentFnSym);
+      OutStreamer->EmitCOFFSymbolStorageClass(Scl);
+      OutStreamer->EmitCOFFSymbolType(Type);
+      OutStreamer->EndCOFFSymbolDef();
+    }
+
+    // Emit the rest of the function body.
+    EmitFunctionBody();
+
+    // Emit the XRay table for this function.
     emitXRayTable();
-    return Result;
+
+    // We didn't modify anything.
+    return false;
   }
 
 private:
Index: test/MC/AArch64/coff-function-type-info.ll
===================================================================
--- /dev/null
+++ test/MC/AArch64/coff-function-type-info.ll
@@ -0,0 +1,45 @@
+; RUN: llc -mtriple arm64-windows -filetype asm -o - %s \
+; RUN:    | FileCheck %s -check-prefix CHECK-ASM
+
+; RUN: llc -mtriple arm64-windows -filetype obj -o - %s \
+; RUN:    | llvm-readobj -t | FileCheck %s -check-prefix CHECK-OBJECT
+
+define arm_aapcs_vfpcc void @external() {
+entry:
+  ret void
+}
+
+; CHECK-ASM: .def external
+; CHECK-ASM:   .scl 2
+; CHECK-ASM:   .type 32
+; CHECK-ASM: .endef
+; CHECK-ASM: .globl external
+
+define internal arm_aapcs_vfpcc void @internal() {
+entry:
+  ret void
+}
+
+; CHECK-ASM: .def internal
+; CHECK-ASM:    .scl 3
+; CHECK-ASM:    .type 32
+; CHECK-ASM: .endef
+; CHECK-ASM-NOT: .globl internal
+
+; CHECK-OBJECT: Symbol {
+; CHECK-OBJECT:   Name: external
+; CHECK-OBJECT:   Section: .text
+; CHECK-OBJECT:   BaseType: Null
+; CHECK-OBJECT:   ComplexType: Function
+; CHECK-OBJECT:   StorageClass: External
+; CHECK-OBJECT:   AuxSymbolCount: 0
+; CHECK-OBJECT: }
+; CHECK-OBJECT: Symbol {
+; CHECK-OBJECT:   Name: internal
+; CHECK-OBJECT:   Section: .text
+; CHECK-OBJECT:   BaseType: Null
+; CHECK-OBJECT:   ComplexType: Function
+; CHECK-OBJECT:   StorageClass: Static
+; CHECK-OBJECT:   AuxSymbolCount: 0
+; CHECK-OBJECT: }
+