1 files changed, 70 insertions, 0 deletions
diff --git a/lib/csu/common/crtend.c b/lib/csu/common/crtend.c
new file mode 100644
index 000000000000..9eb75de2ef60
--- /dev/null
+++ b/lib/csu/common/crtend.c
@@ -0,0 +1,70 @@
+/*-
+ * SPDX-License-Identifier: BSD-1-Clause
+ *
+ * Copyright 2018 Andrew Turner
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <sys/types.h>
+#include "crt.h"
+
+typedef void (*crt_func)(void);
+
+#ifdef HAVE_CTORS
+
+/*
+ * On some architectures and toolchains we may need to call the .ctors.
+ * These are called in the reverse order they are in the ELF file.
+ */
+static void __do_global_ctors_aux(void) __used;
+
+static crt_func __CTOR_END__[] __section(".ctors") __used = {
+	(crt_func)0
+};
+static crt_func __DTOR_END__[] __section(".dtors") __used = {
+	(crt_func)0
+};
+
+extern const char startof_ctors[] __asm(".startof..ctors")
+    __weak_symbol __hidden;
+
+static void
+__do_global_ctors_aux(void)
+{
+	crt_func fn;
+	uintptr_t ctors_start;
+	int n;
+
+	ctors_start = (uintptr_t)&startof_ctors;
+	for (n = 1;; n++) {
+		fn = __CTOR_END__[-n];
+		if (fn == (crt_func)0 || fn == (crt_func)-1 ||
+		    (ctors_start > 0 &&
+		    (uintptr_t)&__CTOR_END__[-n] < ctors_start))
+			break;
+		fn();
+	}
+}
+
+asm (
+    ".pushsection .init		\n"
+    "\t" INIT_CALL_SEQ(__do_global_ctors_aux) "\n"
+    ".popsection		\n"
+);
+#endif