1 files changed, 56 insertions, 0 deletions
diff --git a/linker/linker_tls.cpp b/linker/linker_tls.cpp
new file mode 100644
index 000000000..33274535c
--- /dev/null
+++ b/linker/linker_tls.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#include "linker_tls.h"
+
+#include "private/bionic_defs.h"
+#include "private/bionic_elf_tls.h"
+#include "private/bionic_globals.h"
+#include "private/linker_native_bridge.h"
+
+__BIONIC_WEAK_FOR_NATIVE_BRIDGE
+extern "C" void __linker_reserve_bionic_tls_in_static_tls() {
+  __libc_shared_globals()->static_tls_layout.reserve_bionic_tls();
+}
+
+// Stub for linker static TLS layout.
+void layout_linker_static_tls() {
+  StaticTlsLayout& layout = __libc_shared_globals()->static_tls_layout;
+  layout.reserve_tcb();
+
+  // The pthread key data is located at the very front of bionic_tls. As a
+  // temporary workaround, allocate bionic_tls just after the thread pointer so
+  // Golang can find its pthread key, as long as the executable's TLS segment is
+  // small enough. Specifically, Golang scans forward 384 words from the TP on
+  // ARM.
+  //  - http://b/118381796
+  //  - https://groups.google.com/d/msg/golang-dev/yVrkFnYrYPE/2G3aFzYqBgAJ
+  __linker_reserve_bionic_tls_in_static_tls();
+
+  layout.finish_layout();
+}