| /* SPDX-License-Identifier: GPL-2.0 */ |
| |
| #ifndef __ASM_CSKY_VDSO_H |
| #define __ASM_CSKY_VDSO_H |
| |
| #include <linux/types.h> |
| |
| #ifndef GENERIC_TIME_VSYSCALL |
| struct vdso_data { |
| }; |
| #endif |
| |
| /* |
| * The VDSO symbols are mapped into Linux so we can just use regular symbol |
| * addressing to get their offsets in userspace. The symbols are mapped at an |
| * offset of 0, but since the linker must support setting weak undefined |
| * symbols to the absolute address 0 it also happens to support other low |
| * addresses even when the code model suggests those low addresses would not |
| * otherwise be available. |
| */ |
| #define VDSO_SYMBOL(base, name) \ |
| ({ \ |
| extern const char __vdso_##name[]; \ |
| (void __user *)((unsigned long)(base) + __vdso_##name); \ |
| }) |
| |
| #endif /* __ASM_CSKY_VDSO_H */ |
