1/* SPDX-License-Identifier: GPL-2.0 */
 2
 3#ifndef __ASM_CSKY_VDSO_H
 4#define __ASM_CSKY_VDSO_H
 5
 6#include <linux/types.h>
 7
 8#ifndef GENERIC_TIME_VSYSCALL
 9struct vdso_data {
10};
11#endif
12
13/*
14 * The VDSO symbols are mapped into Linux so we can just use regular symbol
15 * addressing to get their offsets in userspace.  The symbols are mapped at an
16 * offset of 0, but since the linker must support setting weak undefined
17 * symbols to the absolute address 0 it also happens to support other low
18 * addresses even when the code model suggests those low addresses would not
19 * otherwise be available.
20 */
21#define VDSO_SYMBOL(base, name)							\
22({										\
23	extern const char __vdso_##name[];					\
24	(void __user *)((unsigned long)(base) + __vdso_##name);			\
25})
26
27#endif /* __ASM_CSKY_VDSO_H */