1 /* SPDX-License-Identifier: GPL-2.0 */
3 #ifndef __ASM_CSKY_VDSO_H
4 #define __ASM_CSKY_VDSO_H
6 #include <linux/types.h>
8 #ifndef GENERIC_TIME_VSYSCALL
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.
21 #define VDSO_SYMBOL(base, name) \
23 extern const char __vdso_##name[]; \
24 (void __user *)((unsigned long)(base) + __vdso_##name); \
27 #endif /* __ASM_CSKY_VDSO_H */