diff --git a/libc/Android.mk b/libc/Android.mk
index f4fdb4c..72a655c 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -185,6 +185,7 @@
 libc_common_src_files += \
     bionic/fcntl.c \
     bionic/fstatfs.c \
+    bionic/__get_tls.cpp \
     bionic/lseek64.c \
     bionic/sigsuspend.c \
     bionic/statfs.c \
@@ -217,7 +218,7 @@
     bionic/assert.cpp \
     bionic/brk.cpp \
     bionic/dirent.cpp \
-    bionic/__errno.c \
+    bionic/__errno.cpp \
     bionic/eventfd_read.cpp \
     bionic/eventfd_write.cpp \
     bionic/futimens.cpp \
diff --git a/libc/arch-mips/bionic/__get_tls.c b/libc/arch-mips/bionic/__get_tls.c
deleted file mode 100644
index d1cdf0e..0000000
--- a/libc/arch-mips/bionic/__get_tls.c
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-void*   __get_tls(void)
-{
-  register void  *tls asm("v1");
-  asm (".set push\n\t"
-       ".set mips32r2\n\t"
-       "rdhwr %0,$29\n\t"
-       ".set pop"
-       : "=r"(tls));
-  return tls;
-}
diff --git a/libc/arch-mips/mips.mk b/libc/arch-mips/mips.mk
index fe57ee7..7a3c978 100644
--- a/libc/arch-mips/mips.mk
+++ b/libc/arch-mips/mips.mk
@@ -1,6 +1,5 @@
 _LIBC_ARCH_COMMON_SRC_FILES := \
     arch-mips/bionic/__get_sp.S \
-    arch-mips/bionic/__get_tls.c \
     arch-mips/bionic/__set_tls.c \
     arch-mips/bionic/_exit_with_stack_teardown.S \
     arch-mips/bionic/_setjmp.S \
diff --git a/libc/arch-x86/bionic/__get_tls.c b/libc/arch-x86/bionic/__get_tls.c
deleted file mode 100644
index 5ac6e44..0000000
--- a/libc/arch-x86/bionic/__get_tls.c
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-/* see the implementation of __set_tls and pthread.c to understand this
- * code. Basically, the content of gs:[0] always is a pointer to the base
- * address of the tls region
- */
-void*   __get_tls(void)
-{
-  void*  tls;
-  asm ( "   movl  %%gs:0, %0" : "=r"(tls) );
-  return tls;
-}
diff --git a/libc/arch-x86/x86.mk b/libc/arch-x86/x86.mk
index 395f0d4..4a63f5e 100644
--- a/libc/arch-x86/x86.mk
+++ b/libc/arch-x86/x86.mk
@@ -3,7 +3,6 @@
     arch-x86/bionic/_exit_with_stack_teardown.S \
     arch-x86/bionic/futex_x86.S \
     arch-x86/bionic/__get_sp.S \
-    arch-x86/bionic/__get_tls.c \
     arch-x86/bionic/_setjmp.S \
     arch-x86/bionic/setjmp.S \
     arch-x86/bionic/__set_tls.c \
diff --git a/libc/arch-x86_64/bionic/__get_tls.c b/libc/arch-x86_64/bionic/__get_tls.c
deleted file mode 100644
index f21b6b8..0000000
--- a/libc/arch-x86_64/bionic/__get_tls.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-void* __get_tls(void) {
-  void* tls;
-  asm ("mov %%fs:0, %0" : "=r"(tls));
-  return tls;
-}
diff --git a/libc/arch-x86_64/x86_64.mk b/libc/arch-x86_64/x86_64.mk
index d9c8f12..a1c1705 100644
--- a/libc/arch-x86_64/x86_64.mk
+++ b/libc/arch-x86_64/x86_64.mk
@@ -3,7 +3,6 @@
     arch-x86_64/bionic/_exit_with_stack_teardown.S \
     arch-x86_64/bionic/futex_x86_64.S \
     arch-x86_64/bionic/__get_sp.S \
-    arch-x86_64/bionic/__get_tls.c \
     arch-x86_64/bionic/__rt_sigreturn.S \
     arch-x86_64/bionic/_setjmp.S \
     arch-x86_64/bionic/setjmp.S \
diff --git a/libc/bionic/__errno.c b/libc/bionic/__errno.cpp
similarity index 92%
rename from libc/bionic/__errno.c
rename to libc/bionic/__errno.cpp
index 8f33cce..9caa618 100644
--- a/libc/bionic/__errno.c
+++ b/libc/bionic/__errno.cpp
@@ -25,10 +25,11 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
+
 #include <errno.h>
 #include <bionic_tls.h>
+#include <stdint.h>
 
-volatile int*  __errno( void )
-{
-  return  &((volatile int*)__get_tls())[TLS_SLOT_ERRNO];
+volatile int*  __errno() {
+  return reinterpret_cast<int*>(&(__get_tls()[TLS_SLOT_ERRNO]));
 }
diff --git a/libc/bionic/__errno.c b/libc/bionic/__get_tls.cpp
similarity index 90%
copy from libc/bionic/__errno.c
copy to libc/bionic/__get_tls.cpp
index 8f33cce..d01e2aa 100644
--- a/libc/bionic/__errno.c
+++ b/libc/bionic/__get_tls.cpp
@@ -25,10 +25,8 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
-#include <errno.h>
-#include <bionic_tls.h>
 
-volatile int*  __errno( void )
-{
-  return  &((volatile int*)__get_tls())[TLS_SLOT_ERRNO];
+extern "C" void** __get_tls() {
+#include "private/__get_tls.h"
+  return __get_tls();
 }
diff --git a/libc/bionic/libc_init_dynamic.cpp b/libc/bionic/libc_init_dynamic.cpp
index 88e87a7..4e1374e 100644
--- a/libc/bionic/libc_init_dynamic.cpp
+++ b/libc/bionic/libc_init_dynamic.cpp
@@ -65,7 +65,7 @@
 // as soon as the shared library is loaded.
 __attribute__((constructor)) static void __libc_preinit() {
   // Read the kernel argument block pointer from TLS.
-  void* tls = const_cast<void*>(__get_tls());
+  void** tls = __get_tls();
   KernelArgumentBlock** args_slot = &reinterpret_cast<KernelArgumentBlock**>(tls)[TLS_SLOT_BIONIC_PREINIT];
   KernelArgumentBlock* args = *args_slot;
 
diff --git a/libc/bionic/pthread_create.cpp b/libc/bionic/pthread_create.cpp
index 63695d3..9e06afc 100644
--- a/libc/bionic/pthread_create.cpp
+++ b/libc/bionic/pthread_create.cpp
@@ -50,6 +50,8 @@
 
 extern "C" void ATTRIBUTES _thread_created_hook(pid_t thread_id);
 
+extern "C" int __set_tls(void* ptr);
+
 static const int kPthreadInitFailed = 1;
 
 static pthread_mutex_t gPthreadStackCreationLock = PTHREAD_MUTEX_INITIALIZER;
diff --git a/libc/bionic/pthread_internals.cpp b/libc/bionic/pthread_internals.cpp
index 66bc5b7..59c6e48 100644
--- a/libc/bionic/pthread_internals.cpp
+++ b/libc/bionic/pthread_internals.cpp
@@ -64,6 +64,5 @@
 }
 
 __LIBC_ABI_PRIVATE__ pthread_internal_t* __get_thread(void) {
-  void** tls = reinterpret_cast<void**>(const_cast<void*>(__get_tls()));
-  return reinterpret_cast<pthread_internal_t*>(tls[TLS_SLOT_THREAD_ID]);
+  return reinterpret_cast<pthread_internal_t*>(__get_tls()[TLS_SLOT_THREAD_ID]);
 }
diff --git a/libc/bionic/pthread_key.cpp b/libc/bionic/pthread_key.cpp
index 7e8b4cd..706758b 100644
--- a/libc/bionic/pthread_key.cpp
+++ b/libc/bionic/pthread_key.cpp
@@ -133,7 +133,7 @@
   // from this thread's TLS area. This must call the destructor of all keys
   // that have a non-NULL data value and a non-NULL destructor.
   void CleanAll() {
-    void** tls = (void**)__get_tls();
+    void** tls = __get_tls();
 
     // Because destructors can do funky things like deleting/creating other
     // keys, we need to implement this in a loop.
@@ -239,8 +239,7 @@
   // to check that the key is properly allocated. If the key was not
   // allocated, the value read from the TLS should always be NULL
   // due to pthread_key_delete() clearing the values for all threads.
-  uintptr_t address = reinterpret_cast<volatile uintptr_t*>(__get_tls())[key];
-  return reinterpret_cast<void*>(address);
+  return __get_tls()[key];
 }
 
 int pthread_setspecific(pthread_key_t key, const void* ptr) {
@@ -250,6 +249,6 @@
     return EINVAL;
   }
 
-  reinterpret_cast<volatile uintptr_t*>(__get_tls())[key] = reinterpret_cast<uintptr_t>(ptr);
+  __get_tls()[key] = const_cast<void*>(ptr);
   return 0;
 }
diff --git a/libc/private/__get_tls.h b/libc/private/__get_tls.h
new file mode 100644
index 0000000..5f9451d
--- /dev/null
+++ b/libc/private/__get_tls.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef __BIONIC_PRIVATE_GET_TLS_H_
+#define __BIONIC_PRIVATE_GET_TLS_H_
+
+#if defined(__arm__)
+# define __get_tls() \
+    ({ void** __val; \
+       __asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__val)); \
+       __val; })
+#elif defined(__mips__)
+# define __get_tls() \
+    /* On mips32r1, this goes via a kernel illegal instruction trap that's optimized for v1. */ \
+    ({ register void** __val asm("v1"); \
+       __asm__(".set    push\n" \
+               ".set    mips32r2\n" \
+               "rdhwr   %0,$29\n" \
+               ".set    pop\n" : "=r"(__val)); \
+       __val; })
+#elif defined(__i386__)
+# define __get_tls() \
+    ({ void** __val; \
+       __asm__("movl %%gs:0, %0" : "=r"(__val)); \
+       __val; })
+#elif defined(__x86_64__)
+# define __get_tls() \
+    ({ void** __val; \
+       __asm__("mov %%fs:0, %0" : "=r"(__val)); \
+       __val; })
+#else
+#error unsupported architecture
+#endif
+
+#endif /* __BIONIC_PRIVATE_GET_TLS_H_ */
diff --git a/libc/private/bionic_tls.h b/libc/private/bionic_tls.h
index 2e20364..a14bd3c 100644
--- a/libc/private/bionic_tls.h
+++ b/libc/private/bionic_tls.h
@@ -25,10 +25,12 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
-#ifndef _SYS_TLS_H
-#define _SYS_TLS_H
+
+#ifndef __BIONIC_PRIVATE_BIONIC_TLS_H_
+#define __BIONIC_PRIVATE_BIONIC_TLS_H_
 
 #include <sys/cdefs.h>
+#include "__get_tls.h"
 
 __BEGIN_DECLS
 
@@ -83,39 +85,6 @@
 #define BIONIC_ALIGN(x, a) (((x) + (a - 1)) & ~(a - 1))
 #define BIONIC_TLS_SLOTS BIONIC_ALIGN(128 + TLS_SLOT_FIRST_USER_SLOT + GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT, 4)
 
-/* syscall only, do not call directly */
-extern int __set_tls(void* ptr);
-
-/* get the TLS */
-#if defined(__arm__)
-# define __get_tls() \
-    ({ unsigned int __val; \
-       asm ("mrc p15, 0, %0, c13, c0, 3" : "=r"(__val)); \
-       (volatile void*) __val; })
-#elif defined(__mips__)
-# define __get_tls() \
-    /* On mips32r1, this goes via a kernel illegal instruction trap that's optimized for v1. */ \
-    ({ register unsigned int __val asm("v1"); \
-       asm ("   .set    push\n" \
-            "   .set    mips32r2\n" \
-            "   rdhwr   %0,$29\n" \
-            "   .set    pop\n" : "=r"(__val)); \
-       (volatile void*) __val; })
-#elif defined(__i386__)
-# define __get_tls() \
-    ({ void* __val; \
-       asm ("movl %%gs:0, %0" : "=r"(__val)); \
-       (volatile void*) __val; })
-
-#elif defined(__x86_64__)
-# define __get_tls() \
-    ({ void* __val; \
-       asm ("mov %%fs:0, %0" : "=r"(__val)); \
-       (volatile void*) __val; })
-#else
-#error unsupported architecture
-#endif
-
 __END_DECLS
 
 #if defined(__cplusplus)
@@ -123,4 +92,4 @@
 extern __LIBC_HIDDEN__ void __libc_init_tls(KernelArgumentBlock& args);
 #endif
 
-#endif /* _SYS_TLS_H */
+#endif /* __BIONIC_PRIVATE_BIONIC_TLS_H_ */