Index: lib/asan/asan_posix.cc
===================================================================
--- lib/asan/asan_posix.cc
+++ lib/asan/asan_posix.cc
@@ -40,31 +40,60 @@
 
 // ---------------------- TSD ---------------- {{{1
 
+#if !SANITIZER_FREEBSD
 static pthread_key_t tsd_key;
+#else
+struct Tsd {
+  void *data;
+  void (*destructor)(void *tsd);
+  Tsd() : data(nullptr), destructor(nullptr) {}
+  ~Tsd() {
+    if (destructor)
+      destructor(data);
+  }
+};
+
+static thread_local Tsd _tsd;
+#endif
 static bool tsd_key_inited = false;
 void AsanTSDInit(void (*destructor)(void *tsd)) {
   CHECK(!tsd_key_inited);
   tsd_key_inited = true;
+#if !SANITIZER_FREEBSD
   CHECK_EQ(0, pthread_key_create(&tsd_key, destructor));
+#else
+  CHECK_EQ(destructor, &PlatformTSDDtor);
+  _tsd.destructor = destructor;
+#endif
 }
 
 void *AsanTSDGet() {
   CHECK(tsd_key_inited);
+#if !SANITIZER_FREEBSD
   return pthread_getspecific(tsd_key);
+#else
+  return _tsd.data;
+#endif
 }
 
 void AsanTSDSet(void *tsd) {
   CHECK(tsd_key_inited);
+#if !SANITIZER_FREEBSD
   pthread_setspecific(tsd_key, tsd);
+#else
+  _tsd.data = tsd;
+#endif
 }
 
 void PlatformTSDDtor(void *tsd) {
+#if !SANITIZER_FREEBSD
   AsanThreadContext *context = (AsanThreadContext*)tsd;
   if (context->destructor_iterations > 1) {
     context->destructor_iterations--;
     CHECK_EQ(0, pthread_setspecific(tsd_key, tsd));
     return;
   }
+#endif
   AsanThread::TSDDtor(tsd);
 }
 }  // namespace __asan