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 */ 28