vdso.h

 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/*
 9 * The VDSO symbols are mapped into Linux so we can just use regular symbol
10 * addressing to get their offsets in userspace.  The symbols are mapped at an
11 * offset of 0, but since the linker must support setting weak undefined
12 * symbols to the absolute address 0 it also happens to support other low
13 * addresses even when the code model suggests those low addresses would not
14 * otherwise be available.
15 */
16#define VDSO_SYMBOL(base, name)							\
17({										\
18	extern const char __vdso_##name[];					\
19	(void __user *)((unsigned long)(base) + __vdso_##name);			\
20})
21
22#endif /* __ASM_CSKY_VDSO_H */