Add x86 32 bit vDSO time function support

Linux 3.15 adds support for clock_gettime, gettimeofday, and time vDSO
(commit id 37c975545ec63320789962bf307f000f08fabd48).  This patch adds
GLIBC supports to use such symbol when they are avaiable.

Along with x86 vDSO support, this patch cleanup x86_64 code by moving
all common code to x86 common folder.  Only init-first.c is different
between implementations.

1 files changed, 4 insertions, 40 deletions

diff --git a/sysdeps/unix/sysv/linux/x86_64/time.c b/sysdeps/unix/sysv/linux/x86_64/time.c
index c00b5bec0b..6ceb819d82 100644
--- a/sysdeps/unix/sysv/linux/x86_64/time.c
+++ b/sysdeps/unix/sysv/linux/x86_64/time.c
@@ -16,45 +16,9 @@
    <http://www.gnu.org/licenses/>.  */
 
 #ifdef SHARED
-/* Redefine time so that the compiler won't complain about the type
-   mismatch with the IFUNC selector in strong_alias, below.  */
-#undef time
-#define time __redirect_time
-#include <time.h>
-
-#include <dl-vdso.h>
-
+/* If the vDSO is not available we fall back on the old vsyscall.  */
 #define VSYSCALL_ADDR_vtime	0xffffffffff600400
-
-/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
-   ifunc symbol properly.  */
-extern __typeof (__redirect_time) __libc_time;
-void *time_ifunc (void) __asm__ ("__libc_time");
-
-void *
-time_ifunc (void)
-{
-  PREPARE_VERSION (linux26, "LINUX_2.6", 61765110);
-
-  /* If the vDSO is not available we fall back on the old vsyscall.  */
-  return _dl_vdso_vsym ("__vdso_time", &linux26) ?: (void *) VSYSCALL_ADDR_vtime;
-}
-__asm (".type __libc_time, %gnu_indirect_function");
-
-#undef time
-strong_alias (__libc_time, time)
-libc_hidden_ver (__libc_time, time)
-
-#else
-
-# include <time.h>
-# include <sysdep.h>
-
-time_t
-time (time_t *t)
-{
-  INTERNAL_SYSCALL_DECL (err);
-  return INTERNAL_SYSCALL (time, err, 1, t);
-}
-
+#define TIME_FALLBACK           (void*)VSYSCALL_ADDR_vtime
 #endif
+
+#include <sysdeps/unix/sysv/linux/x86/time.c>