Index: include/llvm/CodeGen/AsmPrinter.h
===================================================================
--- include/llvm/CodeGen/AsmPrinter.h
+++ include/llvm/CodeGen/AsmPrinter.h
@@ -546,6 +546,12 @@
   virtual void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
                                 const MCSubtargetInfo *EndInfo) const;
 
+  /// Emit the directive and value for debug thread local expression 
+  ///
+  /// \p Value - The value to emit.
+  /// \p Size - The size of the integer (in bytes) to emit.
+  virtual void EmitDebugThreadLocal(const MCExpr *Value, unsigned Size) const;
+
 private:
   /// Private state for PrintSpecial()
   // Assign a unique ID to this machine instruction.
Index: lib/CodeGen/AsmPrinter/AsmPrinter.cpp
===================================================================
--- lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -567,6 +567,15 @@
   OutStreamer->AddBlankLine();
 }
 
+/// Emit the directive and value for debug thread local expression 
+///
+/// \p Value - The value to emit.
+/// \p Size - The size of the integer (in bytes) to emit.
+void AsmPrinter::EmitDebugThreadLocal(const MCExpr *Value,
+                                      unsigned Size) const {
+  OutStreamer->EmitValue(Value, Size);
+}
+
 /// EmitFunctionHeader - This method emits the header for the current
 /// function.
 void AsmPrinter::EmitFunctionHeader() {
Index: lib/CodeGen/AsmPrinter/DIE.cpp
===================================================================
--- lib/CodeGen/AsmPrinter/DIE.cpp
+++ lib/CodeGen/AsmPrinter/DIE.cpp
@@ -484,7 +484,7 @@
 /// EmitValue - Emit expression value.
 ///
 void DIEExpr::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
-  AP->OutStreamer->EmitValue(Expr, SizeOf(AP, Form));
+  AP->EmitDebugThreadLocal(Expr, SizeOf(AP, Form));
 }
 
 /// SizeOf - Determine size of expression value in bytes.
Index: lib/Target/Mips/MipsAsmPrinter.h
===================================================================
--- lib/Target/Mips/MipsAsmPrinter.h
+++ lib/Target/Mips/MipsAsmPrinter.h
@@ -140,6 +140,7 @@
   void EmitStartOfAsmFile(Module &M) override;
   void EmitEndOfAsmFile(Module &M) override;
   void PrintDebugValueComment(const MachineInstr *MI, raw_ostream &OS);
+  void EmitDebugThreadLocal(const MCExpr *Value, unsigned Size) const override;
 };
 }
 
Index: lib/Target/Mips/MipsAsmPrinter.cpp
===================================================================
--- lib/Target/Mips/MipsAsmPrinter.cpp
+++ lib/Target/Mips/MipsAsmPrinter.cpp
@@ -1037,6 +1037,22 @@
   // TODO: implement
 }
 
+// Emit directive .dtprelword or .dtpreldword directive
+// and value for debug thread local expression.
+void MipsAsmPrinter::EmitDebugThreadLocal(const MCExpr *Value,
+                                          unsigned Size) const {
+  switch (Size) {
+  case 4:
+    OutStreamer->EmitDTPRel32Value(Value);
+    break;
+  case 8:
+    OutStreamer->EmitDTPRel64Value(Value);
+    break;
+  default:
+    llvm_unreachable("Unexpected size of expression value.");
+  }
+}
+
 // Align all targets of indirect branches on bundle size.  Used only if target
 // is NaCl.
 void MipsAsmPrinter::NaClAlignIndirectJumpTargets(MachineFunction &MF) {
Index: lib/Target/Mips/MipsTargetObjectFile.h
===================================================================
--- lib/Target/Mips/MipsTargetObjectFile.h
+++ lib/Target/Mips/MipsTargetObjectFile.h
@@ -42,6 +42,8 @@
     MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
                                      const Constant *C,
                                      unsigned &Align) const override;
+    /// Describe a TLS variable address within debug info.
+    const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const override;
   };
 } // end namespace llvm
 
Index: lib/Target/Mips/MipsTargetObjectFile.cpp
===================================================================
--- lib/Target/Mips/MipsTargetObjectFile.cpp
+++ lib/Target/Mips/MipsTargetObjectFile.cpp
@@ -148,3 +148,11 @@
   // Otherwise, we work the same as ELF.
   return TargetLoweringObjectFileELF::getSectionForConstant(DL, Kind, C, Align);
 }
+
+const MCExpr *
+MipsTargetObjectFile::getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
+  const MCExpr *Expr =
+      MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
+  return MCBinaryExpr::createAdd(
+      Expr, MCConstantExpr::create(0x8000, getContext()), getContext());
+}
Index: test/DebugInfo/Mips/tls.ll
===================================================================
--- /dev/null
+++ test/DebugInfo/Mips/tls.ll
@@ -0,0 +1,22 @@
+; RUN: llc -O0 -march=mips -mcpu=mips32r2 -filetype=asm < %s | FileCheck %s -check-prefix=CHECK-WORD
+; RUN: llc -O0 -march=mips64 -mcpu=mips64r2 -filetype=asm < %s | FileCheck %s -check-prefix=CHECK-DWORD
+
+@x = thread_local global i32 5, align 4, !dbg !0
+
+; CHECK-WORD: .dtprelword x+32768
+; CHECK-DWORD: .dtpreldword x+32768
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8}
+!llvm.ident = !{!9}
+
+!0 = !DIGlobalVariableExpression(var: !1)
+!1 = distinct !DIGlobalVariable(name: "x", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 4.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
+!3 = !DIFile(filename: "tls.c", directory: "/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{!"clang version 4.0.0"}