1 files changed, 68 insertions, 0 deletions
diff --git a/contrib/libexecinfo/builtin.c b/contrib/libexecinfo/builtin.c
new file mode 100644
index 000000000000..3fc861958d15
--- /dev/null
+++ b/contrib/libexecinfo/builtin.c
@@ -0,0 +1,68 @@
+/*	$NetBSD: builtin.c,v 1.1 2012/05/26 22:02:29 christos Exp $	*/
+
+/*-
+ * Copyright (c) 2012 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * 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.
+ * 2. 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <sys/cdefs.h>
+__RCSID("$NetBSD: builtin.c,v 1.1 2012/05/26 22:02:29 christos Exp $");
+
+#include <sys/param.h>
+#include <sys/types.h>
+
+#include "execinfo.h"
+
+#ifdef __MACHINE_STACK_GROWS_UP
+#define BELOW >
+#else
+#define BELOW <
+#endif
+
+#ifdef __lint__
+#define __builtin_frame_address(a)	((void *)a)
+#endif
+
+struct frameinfo {
+	struct frameinfo *next;
+	void *return_address;
+};
+
+size_t
+backtrace(void **trace, size_t len)
+{
+	const struct frameinfo *frame = __builtin_frame_address(0);
+	void *stack = &stack;
+
+	for (size_t i = 0; i < len; i++) {
+		if ((const void *)frame BELOW stack)
+			return i;
+		trace[i] = frame->return_address;
+		frame = frame->next;
+	}
+
+	return len;
+}