diff --git a/lib/libc/arch/powerpc/genassym.cf b/lib/libc/arch/powerpc/genassym.cf
new file mode 100644
index 000000000000..7f94a3da3dc9
--- /dev/null
+++ b/lib/libc/arch/powerpc/genassym.cf
@@ -0,0 +1,43 @@
+#	$NetBSD: genassym.cf,v 1.1 2011/01/14 06:15:27 matt Exp $
+
+#
+# Copyright (c) 2001 The NetBSD Foundation, Inc.
+# All rights reserved.
+#
+# This code is derived from software contributed to The NetBSD Foundation
+# by Matt Thomas <matt@3am-sfotware.com>.
+#
+# 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/types.h>
+include <machine/frame.h>
+include <sys/ucontext.h>
+
+define CALLFRAMELEN	sizeof(struct callframe)
+define CALLFRAME_LR	offsetof(struct callframe, cf_lr)
+define CALLFRAME_R30	offsetof(struct callframe, cf_r30)
+define CALLFRAME_R31	offsetof(struct callframe, cf_r31)
+
+define UC_GREGS_R1	offsetof(ucontext_t, uc_mcontext.__gregs[_REG_R1])
+define UC_GREGS_R3	offsetof(ucontext_t, uc_mcontext.__gregs[_REG_R3])
+define UC_GREGS_PC	offsetof(ucontext_t, uc_mcontext.__gregs[_REG_PC])