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-rw-r--r--nptl/sysdeps/x86_64/tls.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/nptl/sysdeps/x86_64/tls.h b/nptl/sysdeps/x86_64/tls.h
index 999c3aa55a..3d6111f4e3 100644
--- a/nptl/sysdeps/x86_64/tls.h
+++ b/nptl/sysdeps/x86_64/tls.h
@@ -161,6 +161,9 @@ typedef struct
 	  : "i" (offsetof (struct pthread, header.self)));	 	      \
      __self;})
 
+/* Magic for libthread_db to know how to do THREAD_SELF.  */
+# define DB_THREAD_SELF_INCLUDE  <sys/reg.h> /* For the FS constant.  */
+# define DB_THREAD_SELF CONST_THREAD_AREA (64, FS)
 
 /* Read member of the thread descriptor directly.  */
 # define THREAD_GETMEM(descr, member) \