diff --git a/libc/bionic/libc_init_dynamic.cpp b/libc/bionic/libc_init_dynamic.cpp
new file mode 100644
index 0000000..af03fb0
--- /dev/null
+++ b/libc/bionic/libc_init_dynamic.cpp
@@ -0,0 +1,115 @@
+/*
+ * 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.
+ */
+/*
+ * libc_init_dynamic.c
+ *
+ * This source files provides two important functions for dynamic
+ * executables:
+ *
+ * - a C runtime initializer (__libc_preinit), which is called by
+ *   the dynamic linker when libc.so is loaded. This happens before
+ *   any other initializer (e.g. static C++ constructors in other
+ *   shared libraries the program depends on).
+ *
+ * - a program launch function (__libc_init), which is called after
+ *   all dynamic linking has been performed. Technically, it is called
+ *   from arch-$ARCH/bionic/crtbegin_dynamic.S which is itself called
+ *   by the dynamic linker after all libraries have been loaded and
+ *   initialized.
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <elf.h>
+#include "atexit.h"
+#include "KernelArgumentBlock.h"
+#include "libc_init_common.h"
+#include <bionic_tls.h>
+
+extern "C" {
+  extern void pthread_debug_init(void);
+  extern void malloc_debug_init(void);
+  extern void malloc_debug_fini(void);
+};
+
+// We flag the __libc_preinit function as a constructor to ensure
+// that its address is listed in libc.so's .init_array section.
+// This ensures that the function is called by the dynamic linker
+// as soon as the shared library is loaded.
+void __attribute__((constructor)) __libc_preinit(void);
+
+void __libc_preinit() {
+  // Read the kernel argument block pointer from TLS.
+  void* tls = const_cast<void*>(__get_tls());
+  KernelArgumentBlock** args_slot = &reinterpret_cast<KernelArgumentBlock**>(tls)[TLS_SLOT_BIONIC_PREINIT];
+  KernelArgumentBlock* args = *args_slot;
+
+  // Clear the slot so no other initializer sees its value.
+  // __libc_init_common() will change the TLS area so the old one won't be accessible anyway.
+  *args_slot = NULL;
+
+  __libc_init_common(*args);
+
+  // Hooks for the debug malloc and pthread libraries to let them know that we're starting up.
+  pthread_debug_init();
+  malloc_debug_init();
+}
+
+void __libc_postfini() {
+  // A hook for the debug malloc library to let it know that we're shutting down.
+  malloc_debug_fini();
+}
+
+// This function is called from the executable's _start entry point
+// (see arch-$ARCH/bionic/crtbegin_dynamic.S), which is itself
+// called by the dynamic linker after it has loaded all shared
+// libraries the executable depends on.
+//
+// Note that the dynamic linker has also run all constructors in the
+// executable at this point.
+__noreturn void __libc_init(void* raw_args,
+                            void (*onexit)(void),
+                            int (*slingshot)(int, char**, char**),
+                            structors_array_t const * const structors) {
+
+  KernelArgumentBlock args(raw_args);
+
+  // Several Linux ABIs don't pass the onexit pointer, and the ones that
+  // do never use it.  Therefore, we ignore it.
+
+  // The executable may have its own destructors listed in its .fini_array
+  // so we need to ensure that these are called when the program exits
+  // normally.
+  if (structors->fini_array) {
+    __cxa_atexit(__libc_fini,structors->fini_array,NULL);
+  }
+
+  exit(slingshot(args.argc, args.argv, args.envp));
+}