From dd3ef10ea295f8f4181e6044fb19444cad7c6aab Mon Sep 17 00:00:00 2001
From: Guo Ren <ren_guo@c-sky.com>
Date: Wed, 5 Sep 2018 14:25:14 +0800
Subject: csky: VDSO and rt_sigreturn

This patch adds files related to VDSO and our VDSO only support
rt_sigreturn.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/csky/abiv1/inc/abi/vdso.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 arch/csky/abiv1/inc/abi/vdso.h

(limited to 'arch/csky/abiv1')

diff --git a/arch/csky/abiv1/inc/abi/vdso.h b/arch/csky/abiv1/inc/abi/vdso.h
new file mode 100644
index 000000000000..14352f524f1d
--- /dev/null
+++ b/arch/csky/abiv1/inc/abi/vdso.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <linux/uaccess.h>
+
+static inline int setup_vdso_page(unsigned short *ptr)
+{
+	int err = 0;
+
+	/* movi r1, 127 */
+	err |= __put_user(0x67f1, ptr + 0);
+	/* addi r1, (139 - 127) */
+	err |= __put_user(0x20b1, ptr + 1);
+	/* trap 0 */
+	err |= __put_user(0x0008, ptr + 2);
+
+	return err;
+}
-- 
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