diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index d0b48b0..8a5fe4d 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -311,13 +311,26 @@
     return;
   }
   
-  // Handle the tbss directive on darwin which is a thread local bss directive
-  // like zerofill.
-  if (GVKind.isThreadBSS() && MAI->hasMachoTBSSDirective()) {
+  // Handle thread local data for mach-o which requires us to output an
+  // additional structure of data and mangle the original symbol so that we
+  // can reference it later.
+  if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
     // Emit the .tbss symbol
     MCSymbol *MangSym = 
       OutContext.GetOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
-    OutStreamer.EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
+    
+    if (GVKind.isThreadBSS())
+      OutStreamer.EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
+    else if (GVKind.isThreadData()) {
+      OutStreamer.SwitchSection(TheSection);
+
+      EmitLinkage(GV->getLinkage(), MangSym);
+      EmitAlignment(AlignLog, GV);      
+      OutStreamer.EmitLabel(MangSym);
+      
+      EmitGlobalConstant(GV->getInitializer());
+    }
+    
     OutStreamer.AddBlankLine();
     
     // Emit the variable struct for the runtime.
diff --git a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 605e2a8..71ad3fb 100644
--- a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -670,11 +670,10 @@
 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
                        Mangler *Mang, const TargetMachine &TM) const {
   
-  // Handle one kind of thread local...
+  // Handle thread local data.
   if (Kind.isThreadBSS()) return TLSBSSSection;
+  if (Kind.isThreadData()) return TLSDataSection;
 
-  assert(!Kind.isThreadLocal() && "Darwin doesn't support TLS");
-  
   if (Kind.isText())
     return GV->isWeakForLinker() ? TextCoalSection : TextSection;