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 */
23
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