Add vDSO support for aarch64.

Signed-off-by: Dmitry Chestnykh <dm.chestnykh@gmail.com>

extra/Configs/Config.aarch64

@@ -13,6 +13,7 @@ config FORCE_OPTIONS_FOR_ARCH
 	select ARCH_ANY_ENDIAN
 	select ARCH_HAS_MMU
 	select ARCH_USE_MMU
+	select ARCH_VDSO_SUPPORT
 	select UCLIBC_HAS_FPU
 
 choice

ldso/ldso/aarch64/dl-syscalls.h

@@ -1 +1,38 @@
-/* stub for arch-specific syscall issues */
+/* stub for arch-specific syscall issues/specific implementations */
+#ifndef _DL_SYSCALLS_H
+#define _DL_SYSCALLS_H
+
+#ifdef __ARCH_VDSO_GETTIMEOFDAY_NAME
+#undef __ARCH_VDSO_GETTIMEOFDAY_NAME
+#endif
+
+#ifdef __ARCH_VDSO_CLOCK_GETTIME_NAME
+#undef __ARCH_VDSO_CLOCK_GETTIME_NAME
+#endif
+
+#define __ARCH_VDSO_GETTIMEOFDAY_NAME  "__kernel_gettimeofday"
+#define __ARCH_VDSO_CLOCK_GETTIME_NAME "__kernel_clock_gettime"
+
+#if defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO)
+
+#include "../dl-vdso-calls.h"
+
+static int __attribute__ ((used)) __aarch64_vdso_clock_gettime(clockid_t clock_id, struct timespec *tp);
+static int __attribute__ ((used)) __aarch64_vdso_clock_gettime(clockid_t clock_id, struct timespec *tp)
+{
+    return __generic_vdso_clock_gettime(clock_id, tp);
+}
+
+static int __attribute__ ((used)) __aarch64_vdso_gettimeofday(struct timeval *tv, __timezone_ptr_t tz);
+static int __attribute__ ((used)) __aarch64_vdso_gettimeofday(struct timeval *tv, __timezone_ptr_t tz)
+{
+    return __generic_vdso_gettimeofday(tv, tz);
+}
+
+#define ARCH_VDSO_GETTIMEOFDAY(tv, tz)        __aarch64_vdso_gettimeofday(tv, tz)
+#define ARCH_VDSO_CLOCK_GETTIME(clock_id, tp) __aarch64_vdso_clock_gettime(clock_id, tp)
+
+#endif /* defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO) */
+
+#endif /* _DL_SYSCALLS_H */
+