x86: Add vDSO support.

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

extra/Configs/Config.i386

@@ -14,6 +14,7 @@ config FORCE_OPTIONS_FOR_ARCH
 	select ARCH_HAS_MMU
 	select ARCH_HAS_UCONTEXT
 	select ARCH_HAS_DEPRECATED_SYSCALLS
+	select ARCH_VDSO_SUPPORT
 
 choice
 	prompt "Target x86 Processor Family"

ldso/ldso/i386/dl-syscalls.h

@@ -1 +1,29 @@
+/* stub for arch-specific syscall issues/specific implementations */
+
+#ifndef _DL_SYSCALLS_H
+#define _DL_SYSCALLS_H
+
+#if defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO)
+
+#include "../dl-vdso-calls.h"
+
+static int __attribute__ ((used)) __x86_vdso_clock_gettime(clockid_t clock_id, struct timespec *tp);
+static int __attribute__ ((used)) __x86_vdso_clock_gettime(clockid_t clock_id, struct timespec *tp)
+{
+    return __generic_vdso_clock_gettime(clock_id, tp);
+}
+
+static int __attribute__ ((used)) __x86_vdso_gettimeofday(struct timeval *tv, __timezone_ptr_t tz);
+static int __attribute__ ((used)) __x86_vdso_gettimeofday(struct timeval *tv, __timezone_ptr_t tz)
+{
+    return __generic_vdso_gettimeofday(tv, tz);
+}
+
+#define ARCH_VDSO_GETTIMEOFDAY(tv, tz)        __x86_vdso_gettimeofday(tv, tz)
+#define ARCH_VDSO_CLOCK_GETTIME(clock_id, tp) __x86_vdso_clock_gettime(clock_id, tp)
+
+#endif /* defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO) */
+
+#endif /* _DL_SYSCALLS_H */
+
 /* stub for arch-specific syscall issues */