diff options
Diffstat (limited to 'arch/csky/include/asm/vdso.h')
| -rw-r--r-- | arch/csky/include/asm/vdso.h | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/arch/csky/include/asm/vdso.h b/arch/csky/include/asm/vdso.h index d963d691f3a1..eb5142f9c564 100644 --- a/arch/csky/include/asm/vdso.h +++ b/arch/csky/include/asm/vdso.h @@ -3,10 +3,25 @@ #ifndef __ASM_CSKY_VDSO_H #define __ASM_CSKY_VDSO_H -#include <abi/vdso.h> +#include <linux/types.h> -struct csky_vdso { - unsigned short rt_signal_retcode[4]; +#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 availiable. + */ +#define VDSO_SYMBOL(base, name) \ +({ \ + extern const char __vdso_##name[]; \ + (void __user *)((unsigned long)(base) + __vdso_##name); \ +}) #endif /* __ASM_CSKY_VDSO_H */ |