diff --git a/libc/bionic/pthread_internal.h b/libc/bionic/pthread_internal.h
index 27ab3df..cbcdadf 100644
--- a/libc/bionic/pthread_internal.h
+++ b/libc/bionic/pthread_internal.h
@@ -38,6 +38,7 @@
 #define __hwasan_thread_exit()
 #endif
 
+#include "private/bionic_elf_tls.h"
 #include "private/bionic_lock.h"
 #include "private/bionic_tls.h"
 
@@ -154,6 +155,7 @@
 
 __LIBC_HIDDEN__ void __init_tcb(bionic_tcb* tcb, pthread_internal_t* thread);
 __LIBC_HIDDEN__ void __init_tcb_stack_guard(bionic_tcb* tcb);
+__LIBC_HIDDEN__ void __init_tcb_dtv(bionic_tcb* tcb);
 __LIBC_HIDDEN__ void __init_bionic_tls_ptrs(bionic_tcb* tcb, bionic_tls* tls);
 __LIBC_HIDDEN__ bionic_tls* __allocate_temp_bionic_tls();
 __LIBC_HIDDEN__ void __free_temp_bionic_tls(bionic_tls* tls);
@@ -179,6 +181,15 @@
   return *static_cast<bionic_tls*>(__get_tls()[TLS_SLOT_BIONIC_TLS]);
 }
 
+static inline __always_inline TlsDtv* __get_tcb_dtv(bionic_tcb* tcb) {
+  uintptr_t dtv_slot = reinterpret_cast<uintptr_t>(tcb->tls_slot(TLS_SLOT_DTV));
+  return reinterpret_cast<TlsDtv*>(dtv_slot - offsetof(TlsDtv, generation));
+}
+
+static inline void __set_tcb_dtv(bionic_tcb* tcb, TlsDtv* val) {
+  tcb->tls_slot(TLS_SLOT_DTV) = &val->generation;
+}
+
 extern "C" __LIBC_HIDDEN__ int __set_tls(void* ptr);
 
 __LIBC_HIDDEN__ void pthread_key_clean_all(void);