Patchwork [v2,1/8] Remove PREPARE_VERSION and PREPARE_VERSION_KNOW

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Submitter Adhemerval Zanella Netto
Date Sept. 5, 2019, 8:56 p.m.
Message ID <20190905205620.4646-1-adhemerval.zanella@linaro.org>
Download mbox | patch
Permalink /patch/34395/
State New
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Comments

Adhemerval Zanella Netto - Sept. 5, 2019, 8:56 p.m.
Changes from previous version:

  - Remove trailing whitespaces.

--

This patch removes the PREPARE_VERSION and PREPARE_VERSION_KNOW macro
and uses a static inline function instead, get_vdso_symbol.  Each
architecture that supports vDSO must define the Linux version and its
hash for symbol resolution (VDSO_NAME and VDSO_HASH macro respectively).

It also organizes the HAVE_*_VSYSCALL for mips, powerpc, and s390 to set
them on a common header.

The idea is to require less code to configure and enable vDSO support for
newer ports.  No semantic changes are expected.

Checked with a build against all affected architectures.

	* sysdeps/unix/make-syscalls.sh: Make vDSO call use get_vdso_symbol.
	* sysdeps/unix/sysv/linux/aarch64/gettimeofday.c (__gettimeofday):
	Use get_vdso_symbol instead of _dl_vdso_vsym.
	* sysdeps/unix/sysv/linux/powerpc/time.c (time): Likewise.
	* sysdeps/unix/sysv/linux/riscv/flush-icache.c
	(__lookup_riscv_flush_icache): Likewise.
	* sysdeps/unix/sysv/linux/x86/gettimeofday.c (__gettimeofday):
	Likewise.
	* sysdeps/unix/sysv/linux/x86/time.c (time): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/gettimeofday.c: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/arm/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/riscv/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/s390/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/sysdep.h (VDSO_NAME, VDSO_HASH):
	Define.
	* sysdeps/unix/sysv/linux/arm/sysdep.h (VDSO_NAME, VDSO_HASH):
	Likewise.
	* sysdeps/unix/sysv/linux/i386/sysdep.h (VDSO_NAME, VDSO_HASH):
	Likewise.
	* sysdeps/unix/sysv/linux/riscv/sysdep.h (VDSO_NAME, VDSO_HASH):
	Likewise.
	* sysdeps/unix/sysv/linux/sparc/sysdep.h (VDSO_NAME, VDSO_HASH):
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/sysdep.h (VDSO_NAME, VDSO_HASH):
	Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
	(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Remove
	definition.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h
	(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h
	(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
	(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
	(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
	(HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL,
	HAVE_GETTIMEOFDAY_VSYSCALL, HAVE_GETCPU_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
	(HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL,
	HAVE_GETTIMEOFDAY_VSYSCALL, HAVE_GETCPU_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/mips/sysdep.h: New file.
	* sysdeps/unix/sysv/linux/powerpc/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/s390/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/dl-vdso.h (PREPARE_VERSION,
	PREPARE_VERSION_KNOWN, VDSO_NAME_LINUX_2_6, VDSO_HASH_LINUX_2_6,
	VDSO_NAME_LINUX_2_6_15, VDSO_HASH_LINUX_2_6_15,
	VDSO_NAME_LINUX_2_6_29, VDSO_HASH_LINUX_2_6_29,
	VDSO_NAME_LINUX_4_15, VDSO_HASH_LINUX_4_15): Remove defines.
	(get_vdso_symbol): New function.
---
 sysdeps/unix/make-syscalls.sh                 |  5 +--
 .../unix/sysv/linux/aarch64/gettimeofday.c    | 27 ++++---------
 sysdeps/unix/sysv/linux/aarch64/init-first.c  | 12 ++----
 sysdeps/unix/sysv/linux/aarch64/sysdep.h      |  7 ++++
 sysdeps/unix/sysv/linux/arm/init-first.c      |  6 +--
 sysdeps/unix/sysv/linux/arm/sysdep.h          |  3 ++
 sysdeps/unix/sysv/linux/dl-vdso.h             | 38 ++++---------------
 sysdeps/unix/sysv/linux/i386/init-first.c     |  4 +-
 sysdeps/unix/sysv/linux/i386/sysdep.h         |  3 ++
 sysdeps/unix/sysv/linux/mips/init-first.c     |  6 +--
 sysdeps/unix/sysv/linux/mips/mips32/sysdep.h  |  5 +--
 .../unix/sysv/linux/mips/mips64/n32/sysdep.h  |  5 +--
 .../unix/sysv/linux/mips/mips64/n64/sysdep.h  |  5 +--
 sysdeps/unix/sysv/linux/mips/sysdep.h         | 24 ++++++++++++
 .../unix/sysv/linux/powerpc/gettimeofday.c    |  7 ++--
 sysdeps/unix/sysv/linux/powerpc/init-first.c  | 22 +++++------
 .../sysv/linux/powerpc/powerpc32/sysdep.h     |  7 +---
 .../sysv/linux/powerpc/powerpc64/sysdep.h     |  6 +--
 sysdeps/unix/sysv/linux/powerpc/sysdep.h      | 26 +++++++++++++
 sysdeps/unix/sysv/linux/powerpc/time.c        |  5 +--
 sysdeps/unix/sysv/linux/riscv/flush-icache.c  |  4 +-
 sysdeps/unix/sysv/linux/riscv/init-first.c    | 10 ++---
 sysdeps/unix/sysv/linux/riscv/sysdep.h        |  3 ++
 sysdeps/unix/sysv/linux/s390/init-first.c     | 10 ++---
 sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h |  7 +---
 sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h |  7 +---
 sysdeps/unix/sysv/linux/s390/sysdep.h         | 27 +++++++++++++
 sysdeps/unix/sysv/linux/sparc/init-first.c    |  6 +--
 sysdeps/unix/sysv/linux/sparc/sysdep.h        |  3 ++
 sysdeps/unix/sysv/linux/x86/gettimeofday.c    | 10 +++--
 sysdeps/unix/sysv/linux/x86/time.c            |  7 ++--
 sysdeps/unix/sysv/linux/x86_64/init-first.c   |  6 +--
 sysdeps/unix/sysv/linux/x86_64/sysdep.h       |  3 ++
 33 files changed, 168 insertions(+), 158 deletions(-)
 create mode 100644 sysdeps/unix/sysv/linux/mips/sysdep.h
 create mode 100644 sysdeps/unix/sysv/linux/powerpc/sysdep.h
 create mode 100644 sysdeps/unix/sysv/linux/s390/sysdep.h
Andreas Schwab - Sept. 11, 2019, 2:10 p.m.
On Sep 05 2019, Adhemerval Zanella <adhemerval.zanella@linaro.org> wrote:

> diff --git a/sysdeps/unix/sysv/linux/aarch64/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
> index a2f4061b58..662d321235 100644
> --- a/sysdeps/unix/sysv/linux/aarch64/sysdep.h
> +++ b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
> @@ -151,6 +151,13 @@
>  
>  #else /* not __ASSEMBLER__ */
>  
> +# ifdef __LP64__
> +#  define VDSO_NAME  "LINUX_2_6_39"

That should be "LINUX_2.6.39", similar for other occurrences.

Andreas.

Patch

diff --git a/sysdeps/unix/make-syscalls.sh b/sysdeps/unix/make-syscalls.sh
index 6a5c10d54e..b49e6b6305 100644
--- a/sysdeps/unix/make-syscalls.sh
+++ b/sysdeps/unix/make-syscalls.sh
@@ -283,10 +283,9 @@  while read file srcfile caller syscall args strong weak; do
 	(echo '#define ${strong} __redirect_${strong}'; \\
 	 echo '#include <dl-vdso.h>'; \\
 	 echo '#undef ${strong}'; \\
-	 echo '#define vdso_ifunc_init() \\'; \\
-	 echo '  PREPARE_VERSION_KNOWN (symver, ${vdso_symver})'; \\
+	 echo '#define vdso_ifunc_init()'; \\
 	 echo '__ifunc (__redirect_${strong}, ${strong},'; \\
-	 echo '         _dl_vdso_vsym ("${vdso_symbol}", &symver), void,'; \\
+	 echo '         get_vdso_symbol ("${vdso_symbol}"), void,'; \\
 	 echo '         vdso_ifunc_init)'; \\
 EOF
     # This is doing "hidden_def (${strong})", but the compiler
diff --git a/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c b/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c
index 9180b50bf7..9499a11fda 100644
--- a/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c
+++ b/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c
@@ -20,12 +20,10 @@ 
    putting it into *tv and *tz.  If tz is null, *tz is not filled.
    Returns 0 on success, -1 on errors.  */
 
+#include <sys/time.h>
+
 #ifdef SHARED
 
-# define __gettimeofday __redirect___gettimeofday
-# include <sys/time.h>
-# undef __gettimeofday
-# define HAVE_VSYSCALL
 # include <dl-vdso.h>
 # include <sysdep-vdso.h>
 
@@ -38,25 +36,14 @@  __gettimeofday_vsyscall (struct timeval *tv, struct timezone *tz)
   return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
 }
 
-/* PREPARE_VERSION_KNOWN will need an __LP64__ ifdef when ILP32 support
-   goes in.  See _libc_vdso_platform_setup in
-   sysdeps/unix/sysv/linux/aarch64/init-first.c.  */
-
-# undef INIT_ARCH
-# define INIT_ARCH() \
-	   PREPARE_VERSION_KNOWN (linux_version, LINUX_2_6_39); \
-	   void *vdso_gettimeofday = \
-	     _dl_vdso_vsym ("__kernel_gettimeofday", &linux_version);
-
-libc_ifunc_hidden (__redirect___gettimeofday, __gettimeofday,
-		   vdso_gettimeofday ?: (void *) __gettimeofday_vsyscall)
-
-__hidden_ver1 (__gettimeofday_vsyscall, __GI___gettimeofday,
-	       __gettimeofday_vsyscall);
+# define INIT_ARCH()
+libc_ifunc_hidden (__gettimeofday, __gettimeofday,
+		   (get_vdso_symbol ("__vdso_gettimeofday")
+		    ?: __gettimeofday_vsyscall))
+libc_hidden_def (__gettimeofday)
 
 #else
 
-# include <sys/time.h>
 # include <sysdep.h>
 int
 __gettimeofday (struct timeval *tv, struct timezone *tz)
diff --git a/sysdeps/unix/sysv/linux/aarch64/init-first.c b/sysdeps/unix/sysv/linux/aarch64/init-first.c
index 80f7ed91ef..c3c27cfd4b 100644
--- a/sysdeps/unix/sysv/linux/aarch64/init-first.c
+++ b/sysdeps/unix/sysv/linux/aarch64/init-first.c
@@ -26,21 +26,15 @@  int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *);
 static inline void
 _libc_vdso_platform_setup (void)
 {
-#ifdef __LP64__
-  PREPARE_VERSION_KNOWN (linux_version, LINUX_2_6_39);
-#else
-  PREPARE_VERSION_KNOWN (linux_version, LINUX_4_9);
-#endif
-
-  void *p = _dl_vdso_vsym ("__kernel_gettimeofday", &linux_version);
+  void *p = get_vdso_symbol ("__kernel_gettimeofday");
   PTR_MANGLE (p);
   VDSO_SYMBOL(gettimeofday) = p;
 
-  p = _dl_vdso_vsym ("__kernel_clock_gettime", &linux_version);
+  p = get_vdso_symbol ("__kernel_clock_gettime");
   PTR_MANGLE (p);
   VDSO_SYMBOL(clock_gettime) = p;
 
-  p = _dl_vdso_vsym ("__kernel_clock_getres", &linux_version);
+  p = get_vdso_symbol ("__kernel_clock_getres");
   PTR_MANGLE (p);
   VDSO_SYMBOL(clock_getres) = p;
 }
diff --git a/sysdeps/unix/sysv/linux/aarch64/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
index a2f4061b58..662d321235 100644
--- a/sysdeps/unix/sysv/linux/aarch64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
@@ -151,6 +151,13 @@ 
 
 #else /* not __ASSEMBLER__ */
 
+# ifdef __LP64__
+#  define VDSO_NAME  "LINUX_2_6_39"
+#  define VDSO_HASH  123718537
+# else
+#  define VDSO_NAME  "LINUX_4.9"
+#  define VDSO_HASH  61765625
+# endif
 
 /* List of system calls which are supported as vsyscalls.  */
 # define HAVE_CLOCK_GETRES_VSYSCALL	1
diff --git a/sysdeps/unix/sysv/linux/arm/init-first.c b/sysdeps/unix/sysv/linux/arm/init-first.c
index e1846df661..2852ab135c 100644
--- a/sysdeps/unix/sysv/linux/arm/init-first.c
+++ b/sysdeps/unix/sysv/linux/arm/init-first.c
@@ -27,13 +27,11 @@  int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *);
 static inline void
 _libc_vdso_platform_setup (void)
 {
-  PREPARE_VERSION_KNOWN (linux26, LINUX_2_6);
-
-  void *p = _dl_vdso_vsym ("__vdso_gettimeofday", &linux26);
+  void *p = get_vdso_symbol ("__vdso_gettimeofday");
   PTR_MANGLE (p);
   VDSO_SYMBOL (gettimeofday) = p;
 
-  p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux26);
+  p = get_vdso_symbol ("__vdso_clock_gettime");
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_gettime) = p;
 }
diff --git a/sysdeps/unix/sysv/linux/arm/sysdep.h b/sysdeps/unix/sysv/linux/arm/sysdep.h
index 6d8d9a47f9..467ccf2631 100644
--- a/sysdeps/unix/sysv/linux/arm/sysdep.h
+++ b/sysdeps/unix/sysv/linux/arm/sysdep.h
@@ -388,6 +388,9 @@  __local_syscall_error:						\
 #undef INTERNAL_SYSCALL_ERRNO
 #define INTERNAL_SYSCALL_ERRNO(val, err)	(-(val))
 
+#define VDSO_NAME  "LINUX_2_6"
+#define VDSO_HASH  61765110
+
 /* List of system calls which are supported as vsyscalls.  */
 #define HAVE_CLOCK_GETTIME_VSYSCALL	1
 #define HAVE_GETTIMEOFDAY_VSYSCALL	1
diff --git a/sysdeps/unix/sysv/linux/dl-vdso.h b/sysdeps/unix/sysv/linux/dl-vdso.h
index d83afe130e..bab3779615 100644
--- a/sysdeps/unix/sysv/linux/dl-vdso.h
+++ b/sysdeps/unix/sysv/linux/dl-vdso.h
@@ -22,40 +22,18 @@ 
 #include <assert.h>
 #include <ldsodefs.h>
 #include <dl-hash.h>
-
-/* Create version number record for lookup.  */
-static inline struct r_found_version
-prepare_version_base (const char *name, ElfW(Word) hash)
-{
-  assert (hash == _dl_elf_hash (name));
-  return (struct r_found_version) { name, hash, 1, NULL };
-}
-#define prepare_version(vname) \
-  prepare_version_base (VDSO_NAME_##vname, VDSO_HASH_##vname)
-
-/* Use this for the known version sets defined below, where we
-   record their precomputed hash values only once, in this file.  */
-#define PREPARE_VERSION_KNOWN(var, vname) \
-  struct r_found_version var = prepare_version (vname);
-
-#define VDSO_NAME_LINUX_2_6	"LINUX_2.6"
-#define VDSO_HASH_LINUX_2_6	61765110
-#define VDSO_NAME_LINUX_2_6_15	"LINUX_2.6.15"
-#define VDSO_HASH_LINUX_2_6_15	123718565
-#define VDSO_NAME_LINUX_2_6_29	"LINUX_2.6.29"
-#define VDSO_HASH_LINUX_2_6_29	123718585
-#define VDSO_NAME_LINUX_2_6_39	"LINUX_2.6.39"
-#define VDSO_HASH_LINUX_2_6_39	123718537
-#define VDSO_NAME_LINUX_4	"LINUX_4"
-#define VDSO_HASH_LINUX_4	14921332
-#define VDSO_NAME_LINUX_4_9	"LINUX_4.9"
-#define VDSO_HASH_LINUX_4_9	61765625
-#define VDSO_NAME_LINUX_4_15	"LINUX_4.15"
-#define VDSO_HASH_LINUX_4_15	182943605
+#include <libc-vdso.h>
 
 /* Functions for resolving symbols in the VDSO link map.  */
 extern void *_dl_vdso_vsym (const char *name,
 			    const struct r_found_version *version)
       attribute_hidden;
 
+static inline void *
+get_vdso_symbol (const char *symbol)
+{
+  struct r_found_version rfv = { VDSO_NAME, VDSO_HASH, 1, NULL };
+  return _dl_vdso_vsym (symbol, &rfv);
+}
+
 #endif /* dl-vdso.h */
diff --git a/sysdeps/unix/sysv/linux/i386/init-first.c b/sysdeps/unix/sysv/linux/i386/init-first.c
index 60d69777cd..9c03f87b67 100644
--- a/sysdeps/unix/sysv/linux/i386/init-first.c
+++ b/sysdeps/unix/sysv/linux/i386/init-first.c
@@ -34,9 +34,7 @@  clock_gettime_syscall (clockid_t id, struct timespec *tp)
 static inline void
 __vdso_platform_setup (void)
 {
-  PREPARE_VERSION_KNOWN (linux26, LINUX_2_6);
-
-  void *p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux26);
+  void *p = get_vdso_symbol ("__vdso_clock_gettime");
   if (p == NULL)
     p = clock_gettime_syscall;
   PTR_MANGLE (p);
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h
index 77154b904a..278028f52e 100644
--- a/sysdeps/unix/sysv/linux/i386/sysdep.h
+++ b/sysdeps/unix/sysv/linux/i386/sysdep.h
@@ -309,6 +309,9 @@  struct libc_do_syscall_args
 #define INLINE_SYSCALL_ERROR_RETURN_VALUE(resultvar) \
   __syscall_error (-(resultvar))
 
+# define VDSO_NAME  "LINUX_2.6"
+# define VDSO_HASH  61765110
+
 /* List of system calls which are supported as vsyscalls.  */
 # define HAVE_CLOCK_GETTIME_VSYSCALL    1
 # define HAVE_GETTIMEOFDAY_VSYSCALL     1
diff --git a/sysdeps/unix/sysv/linux/mips/init-first.c b/sysdeps/unix/sysv/linux/mips/init-first.c
index 25884ffd80..2a43bdc8b0 100644
--- a/sysdeps/unix/sysv/linux/mips/init-first.c
+++ b/sysdeps/unix/sysv/linux/mips/init-first.c
@@ -26,13 +26,11 @@  int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *);
 static inline void
 _libc_vdso_platform_setup (void)
 {
-  PREPARE_VERSION_KNOWN (linux26, LINUX_2_6);
-
-  void *p = _dl_vdso_vsym ("__vdso_gettimeofday", &linux26);
+  void *p = get_vdso_symbol ("__vdso_gettimeofday");
   PTR_MANGLE (p);
   VDSO_SYMBOL (gettimeofday) = p;
 
-  p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux26);
+  p = get_vdso_symbol ("__vdso_clock_gettime");
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_gettime) = p;
 }
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h b/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
index a310a0acbc..ebe397b701 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
@@ -19,6 +19,7 @@ 
 #define _LINUX_MIPS_MIPS32_SYSDEP_H 1
 
 /* There is some commonality.  */
+#include <sysdeps/unix/sysv/linux/mips/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/mips/mips32/sysdep.h>
 
@@ -360,10 +361,6 @@  libc_hidden_proto (__mips_syscall7, nomips16)
     _ret;								\
   })
 
-/* List of system calls which are supported as vsyscalls.  */
-#define HAVE_CLOCK_GETTIME_VSYSCALL	1
-#define HAVE_GETTIMEOFDAY_VSYSCALL	1
-
 #endif /* __ASSEMBLER__ */
 
 /* Pointer mangling is not yet supported for MIPS.  */
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h b/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h
index d83e08f96a..bb49429c30 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h
@@ -19,6 +19,7 @@ 
 #define _LINUX_MIPS_SYSDEP_H 1
 
 /* There is some commonality.  */
+#include <sysdeps/unix/sysv/linux/mips/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/mips/mips64/n32/sysdep.h>
 
@@ -308,10 +309,6 @@ 
     _ret;								\
   })
 
-/* List of system calls which are supported as vsyscalls.  */
-#define HAVE_CLOCK_GETTIME_VSYSCALL	1
-#define HAVE_GETTIMEOFDAY_VSYSCALL	1
-
 #endif /* __ASSEMBLER__ */
 
 /* Pointer mangling is not yet supported for MIPS.  */
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h b/sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h
index bcfaf561a1..84a1ff186b 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h
@@ -19,6 +19,7 @@ 
 #define _LINUX_MIPS_SYSDEP_H 1
 
 /* There is some commonality.  */
+#include <sysdeps/unix/sysv/linux/mips/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/mips/mips64/n64/sysdep.h>
 
@@ -304,10 +305,6 @@ 
     _ret;								\
   })
 
-/* List of system calls which are supported as vsyscalls.  */
-#define HAVE_CLOCK_GETTIME_VSYSCALL	1
-#define HAVE_GETTIMEOFDAY_VSYSCALL	1
-
 #endif /* __ASSEMBLER__ */
 
 /* Pointer mangling is not yet supported for MIPS.  */
diff --git a/sysdeps/unix/sysv/linux/mips/sysdep.h b/sysdeps/unix/sysv/linux/mips/sysdep.h
new file mode 100644
index 0000000000..cabc590961
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mips/sysdep.h
@@ -0,0 +1,24 @@ 
+/* Syscall definitions, Linux MIPS generic version.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define VDSO_NAME  "LINUX_2_6"
+#define VDSO_HASH  61765110
+
+/* List of system calls which are supported as vsyscalls.  */
+#define HAVE_CLOCK_GETTIME_VSYSCALL     1
+#define HAVE_GETTIMEOFDAY_VSYSCALL      1
diff --git a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c b/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
index 463b678ad9..c59d5ddc10 100644
--- a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
+++ b/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
@@ -57,10 +57,9 @@  __gettimeofday_syscall (struct timeval *tv, struct timezone *tz)
   return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
 }
 
-# define INIT_ARCH()						\
-  PREPARE_VERSION_KNOWN (linux2615, LINUX_2_6_15);		\
-  void *vdso_gettimeofday = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2615);
-
+# define INIT_ARCH() \
+  void *vdso_gettimeofday = get_vdso_symbol ("__kernel_gettimeofday")
+  
 /* If the vDSO is not available we fall back syscall.  */
 libc_ifunc_hidden (__redirect___gettimeofday, __gettimeofday,
 		   vdso_gettimeofday
diff --git a/sysdeps/unix/sysv/linux/powerpc/init-first.c b/sysdeps/unix/sysv/linux/powerpc/init-first.c
index 831f910788..0d46563ce3 100644
--- a/sysdeps/unix/sysv/linux/powerpc/init-first.c
+++ b/sysdeps/unix/sysv/linux/powerpc/init-first.c
@@ -37,29 +37,27 @@  void *VDSO_SYMBOL(sigtramp_rt32);
 static inline void
 _libc_vdso_platform_setup (void)
 {
-  PREPARE_VERSION_KNOWN (linux2615, LINUX_2_6_15);
-
-  void *p = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2615);
+  void *p = get_vdso_symbol ("__kernel_gettimeofday");
   PTR_MANGLE (p);
   VDSO_SYMBOL (gettimeofday) = p;
 
-  p = _dl_vdso_vsym ("__kernel_clock_gettime", &linux2615);
+  p = get_vdso_symbol ("__kernel_clock_gettime");
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_gettime) = p;
 
-  p = _dl_vdso_vsym ("__kernel_clock_getres", &linux2615);
+  p = get_vdso_symbol ("__kernel_clock_getres");
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_getres) = p;
 
-  p = _dl_vdso_vsym ("__kernel_get_tbfreq", &linux2615);
+  p = get_vdso_symbol ("__kernel_get_tbfreq");
   PTR_MANGLE (p);
   VDSO_SYMBOL (get_tbfreq) = p;
 
-  p = _dl_vdso_vsym ("__kernel_getcpu", &linux2615);
+  p = get_vdso_symbol ("__kernel_getcpu");
   PTR_MANGLE (p);
   VDSO_SYMBOL (getcpu) = p;
 
-  p = _dl_vdso_vsym ("__kernel_time", &linux2615);
+  p = get_vdso_symbol ("__kernel_time");
   PTR_MANGLE (p);
   VDSO_SYMBOL (time) = p;
 
@@ -69,12 +67,10 @@  _libc_vdso_platform_setup (void)
      There is no need to pointer mangle these symbol because they will
      used only for pointer comparison.  */
 #if defined(__PPC64__) || defined(__powerpc64__)
-  VDSO_SYMBOL(sigtramp_rt64) = _dl_vdso_vsym ("__kernel_sigtramp_rt64",
-					      &linux2615);
+  VDSO_SYMBOL(sigtramp_rt64) =  get_vdso_symbol ("__kernel_sigtramp_rt64");
 #else
-  VDSO_SYMBOL(sigtramp32) = _dl_vdso_vsym ("__kernel_sigtramp32", &linux2615);
-  VDSO_SYMBOL(sigtramp_rt32) = _dl_vdso_vsym ("__kernel_sigtramp_rt32",
-					      &linux2615);
+  VDSO_SYMBOL(sigtramp32) = get_vdso_symbol ("__kernel_sigtramp32");
+  VDSO_SYMBOL(sigtramp_rt32) = get_vdso_symbol ("__kernel_sigtramp_rt32");
 #endif
 }
 
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
index 62caa265d7..f459543fcd 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
@@ -18,6 +18,7 @@ 
 #ifndef _LINUX_POWERPC_SYSDEP_H
 #define _LINUX_POWERPC_SYSDEP_H 1
 
+#include <sysdeps/unix/sysv/linux/powerpc/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/powerpc/sysdep.h>
 #include <tls.h>
@@ -144,12 +145,6 @@ 
     sc_ret;								      \
   })
 
-/* List of system calls which are supported as vsyscalls.  */
-# define HAVE_CLOCK_GETRES_VSYSCALL	1
-# define HAVE_CLOCK_GETTIME_VSYSCALL	1
-# define HAVE_GETCPU_VSYSCALL		1
-
-
 # define LOADARGS_0(name, dummy)					      \
 	r0 = name
 # define LOADARGS_1(name, __arg1) \
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
index 4122e5c4a9..06222f52e6 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
@@ -20,6 +20,7 @@ 
 #ifndef _LINUX_POWERPC_SYSDEP_H
 #define _LINUX_POWERPC_SYSDEP_H 1
 
+#include <sysdeps/unix/sysv/linux/powerpc/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/powerpc/sysdep.h>
 #include <tls.h>
@@ -60,11 +61,6 @@ 
     sc_ret;								      \
   })
 
-/* List of system calls which are supported as vsyscalls.  */
-#define HAVE_CLOCK_GETRES_VSYSCALL	1
-#define HAVE_CLOCK_GETTIME_VSYSCALL	1
-#define HAVE_GETCPU_VSYSCALL		1
-
 /* Define a macro which expands inline into the wrapper code for a system
    call. This use is for internal calls that do not need to handle errors
    normally. It will never touch errno. This returns just what the kernel
diff --git a/sysdeps/unix/sysv/linux/powerpc/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
new file mode 100644
index 0000000000..5b411d0e8e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
@@ -0,0 +1,26 @@ 
+/* Syscall definitions, Linux PowerPC generic version.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define VDSO_NAME  "LINUX_2.6.15"
+#define VDSO_HASH  123718565
+
+/* List of system calls which are supported as vsyscalls.  */
+#define HAVE_CLOCK_GETRES_VSYSCALL	1
+#define HAVE_CLOCK_GETTIME_VSYSCALL	1
+#define HAVE_GETCPU_VSYSCALL		1
+
diff --git a/sysdeps/unix/sysv/linux/powerpc/time.c b/sysdeps/unix/sysv/linux/powerpc/time.c
index cb3e8b9a73..38477bce8b 100644
--- a/sysdeps/unix/sysv/linux/powerpc/time.c
+++ b/sysdeps/unix/sysv/linux/powerpc/time.c
@@ -66,9 +66,8 @@  time_syscall (time_t *t)
   return result;
 }
 
-# define INIT_ARCH()						\
-  PREPARE_VERSION_KNOWN (linux2615, LINUX_2_6_15);		\
-  void *vdso_time = _dl_vdso_vsym ("__kernel_time", &linux2615);
+# define INIT_ARCH() \
+  void *vdso_time = get_vdso_symbol ("__kernel_time");
 
 /* If the vDSO is not available we fall back to the syscall.  */
 libc_ifunc_hidden (__redirect_time, time,
diff --git a/sysdeps/unix/sysv/linux/riscv/flush-icache.c b/sysdeps/unix/sysv/linux/riscv/flush-icache.c
index f2dfcc50d0..6fbda9a088 100644
--- a/sysdeps/unix/sysv/linux/riscv/flush-icache.c
+++ b/sysdeps/unix/sysv/linux/riscv/flush-icache.c
@@ -38,9 +38,7 @@  __riscv_flush_icache_syscall (void *start, void *end, unsigned long int flags)
 static func_type
 __lookup_riscv_flush_icache (void)
 {
-  PREPARE_VERSION_KNOWN (linux_version, LINUX_4_15);
-
-  func_type func = _dl_vdso_vsym ("__vdso_flush_icache", &linux_version);
+  func_type func = get_vdso_symbol ("__vdso_flush_icache");
 
   /* If there is no vDSO entry then call the system call directly.  All Linux
      versions provide the vDSO entry, but QEMU's user-mode emulation doesn't
diff --git a/sysdeps/unix/sysv/linux/riscv/init-first.c b/sysdeps/unix/sysv/linux/riscv/init-first.c
index 98a8ce33ad..f3d243a192 100644
--- a/sysdeps/unix/sysv/linux/riscv/init-first.c
+++ b/sysdeps/unix/sysv/linux/riscv/init-first.c
@@ -32,21 +32,19 @@  long int (*VDSO_SYMBOL (clock_getres)) (clockid_t, struct timespec *)
 static inline void
 _libc_vdso_platform_setup (void)
 {
-  PREPARE_VERSION_KNOWN (linux_version, LINUX_4_15);
-
-  void *p = _dl_vdso_vsym ("__vdso_getcpu", &linux_version);
+  void *p = get_vdso_symbol ("__vdso_getcpu");
   PTR_MANGLE (p);
   VDSO_SYMBOL (getcpu) = p;
 
-  p = _dl_vdso_vsym ("__vdso_gettimeofday", &linux_version);
+  p = get_vdso_symbol ("__vdso_gettimeofday");
   PTR_MANGLE (p);
   VDSO_SYMBOL (gettimeofday) = p;
 
-  p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux_version);
+  p = get_vdso_symbol ("__vdso_clock_gettime");
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_gettime) = p;
 
-  p = _dl_vdso_vsym ("__vdso_clock_getres", &linux_version);
+  p = get_vdso_symbol ("__vdso_clock_getres");
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_getres) = p;
 }
diff --git a/sysdeps/unix/sysv/linux/riscv/sysdep.h b/sysdeps/unix/sysv/linux/riscv/sysdep.h
index 5470ea3d2a..5de773744c 100644
--- a/sysdeps/unix/sysv/linux/riscv/sysdep.h
+++ b/sysdeps/unix/sysv/linux/riscv/sysdep.h
@@ -121,6 +121,9 @@ 
 
 #ifndef __ASSEMBLER__
 
+# define VDSO_NAME  "LINUX_4.15"
+# define VDSO_HASH  182943605
+
 /* List of system calls which are supported as vsyscalls.  */
 # define HAVE_CLOCK_GETRES_VSYSCALL	1
 # define HAVE_CLOCK_GETTIME_VSYSCALL	1
diff --git a/sysdeps/unix/sysv/linux/s390/init-first.c b/sysdeps/unix/sysv/linux/s390/init-first.c
index a1ad9458e3..3e36270eac 100644
--- a/sysdeps/unix/sysv/linux/s390/init-first.c
+++ b/sysdeps/unix/sysv/linux/s390/init-first.c
@@ -34,21 +34,19 @@  long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *)
 static inline void
 _libc_vdso_platform_setup (void)
 {
-  PREPARE_VERSION_KNOWN (linux2629, LINUX_2_6_29);
-
-  void *p = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2629);
+  void *p = get_vdso_symbol ("__kernel_gettimeofday");
   PTR_MANGLE (p);
   VDSO_SYMBOL (gettimeofday) = p;
 
-  p = _dl_vdso_vsym ("__kernel_clock_gettime", &linux2629);
+  p = get_vdso_symbol ("__kernel_clock_gettime");
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_gettime) = p;
 
-  p = _dl_vdso_vsym ("__kernel_clock_getres", &linux2629);
+  p = get_vdso_symbol ("__kernel_clock_getres");
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_getres) = p;
 
-  p = _dl_vdso_vsym ("__kernel_getcpu", &linux2629);
+  p = get_vdso_symbol ("__kernel_getcpu");
   PTR_MANGLE (p);
   VDSO_SYMBOL (getcpu) = p;
 }
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
index 640fb52de1..b780d22d8f 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
@@ -21,6 +21,7 @@ 
 
 #include <sysdeps/s390/s390-32/sysdep.h>
 #include <sysdeps/unix/sysdep.h>
+#include <sysdeps/unix/sysv/linux/s390/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <dl-sysdep.h>	/* For RTLD_PRIVATE_ERRNO.  */
 #include <tls.h>
@@ -271,12 +272,6 @@ 
 #define ASMFMT_5 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6)
 #define ASMFMT_6 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6), "d" (gpr7)
 
-/* List of system calls which are supported as vsyscalls.  */
-#define HAVE_CLOCK_GETRES_VSYSCALL	1
-#define HAVE_CLOCK_GETTIME_VSYSCALL	1
-#define HAVE_GETTIMEOFDAY_VSYSCALL	1
-#define HAVE_GETCPU_VSYSCALL		1
-
 /* Pointer mangling support.  */
 #if IS_IN (rtld)
 /* We cannot use the thread descriptor because in ld.so we use setjmp
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
index 9a9834c750..07cfa64cab 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
@@ -22,6 +22,7 @@ 
 
 #include <sysdeps/s390/s390-64/sysdep.h>
 #include <sysdeps/unix/sysdep.h>
+#include <sysdeps/unix/sysv/linux/s390/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <dl-sysdep.h>	/* For RTLD_PRIVATE_ERRNO.  */
 #include <tls.h>
@@ -277,12 +278,6 @@ 
 #define ASMFMT_5 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6)
 #define ASMFMT_6 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6), "d" (gpr7)
 
-/* List of system calls which are supported as vsyscalls.  */
-#define HAVE_CLOCK_GETRES_VSYSCALL	1
-#define HAVE_CLOCK_GETTIME_VSYSCALL	1
-#define HAVE_GETTIMEOFDAY_VSYSCALL	1
-#define HAVE_GETCPU_VSYSCALL		1
-
 #define SINGLE_THREAD_BY_GLOBAL		1
 
 /* Pointer mangling support.  */
diff --git a/sysdeps/unix/sysv/linux/s390/sysdep.h b/sysdeps/unix/sysv/linux/s390/sysdep.h
new file mode 100644
index 0000000000..eefbd8f007
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/s390/sysdep.h
@@ -0,0 +1,27 @@ 
+/* Syscall definitions, Linux PowerPC generic version.
+   Copyright (C) 2000-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define VDSO_NAME  "LINUX_2_6_29"
+#define VDSO_HASH  123718585
+
+/* List of system calls which are supported as vsyscalls.  */
+#define HAVE_CLOCK_GETRES_VSYSCALL	1
+#define HAVE_CLOCK_GETTIME_VSYSCALL	1
+#define HAVE_GETTIMEOFDAY_VSYSCALL	1
+#define HAVE_GETCPU_VSYSCALL		1
+
diff --git a/sysdeps/unix/sysv/linux/sparc/init-first.c b/sysdeps/unix/sysv/linux/sparc/init-first.c
index 643d6c7c88..bdaa78fd32 100644
--- a/sysdeps/unix/sysv/linux/sparc/init-first.c
+++ b/sysdeps/unix/sysv/linux/sparc/init-first.c
@@ -28,13 +28,11 @@  long int (*VDSO_SYMBOL (clock_gettime)) (clockid_t, struct timespec *)
 static inline void
 _libc_vdso_platform_setup (void)
 {
-  PREPARE_VERSION_KNOWN (linux_version, LINUX_2_6);
-
-  void *p = _dl_vdso_vsym ("__vdso_gettimeofday", &linux_version);
+  void *p = get_vdso_symbol ("__vdso_gettimeofday");
   PTR_MANGLE (p);
   VDSO_SYMBOL (gettimeofday) = p;
 
-  p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux_version);
+  p = get_vdso_symbol ("__vdso_clock_gettime");
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_gettime) = p;
 }
diff --git a/sysdeps/unix/sysv/linux/sparc/sysdep.h b/sysdeps/unix/sysv/linux/sparc/sysdep.h
index 981b2a26b7..3bfb1fc60e 100644
--- a/sysdeps/unix/sysv/linux/sparc/sysdep.h
+++ b/sysdeps/unix/sysv/linux/sparc/sysdep.h
@@ -41,6 +41,9 @@ 
     _ret;								\
   })
 
+# define VDSO_NAME  "LINUX_2_6"
+# define VDSO_HASH  61765110
+
 /* List of system calls which are supported as vsyscalls.  */
 # define HAVE_CLOCK_GETTIME_VSYSCALL	1
 # define HAVE_GETTIMEOFDAY_VSYSCALL	1
diff --git a/sysdeps/unix/sysv/linux/x86/gettimeofday.c b/sysdeps/unix/sysv/linux/x86/gettimeofday.c
index 8886ccd707..3ceab633e5 100644
--- a/sysdeps/unix/sysv/linux/x86/gettimeofday.c
+++ b/sysdeps/unix/sysv/linux/x86/gettimeofday.c
@@ -22,6 +22,8 @@ 
 
 # include <dl-vdso.h>
 # include <errno.h>
+# include <sysdep-vdso.h>
+# include <sysdep-vdso.h>
 
 static int
 __gettimeofday_syscall (struct timeval *tv, struct timezone *tz)
@@ -36,12 +38,12 @@  __gettimeofday_syscall (struct timeval *tv, struct timezone *tz)
 #  define __gettimeofday_type __gettimeofday
 # endif
 
-# undef INIT_ARCH
-# define INIT_ARCH() PREPARE_VERSION_KNOWN (linux26, LINUX_2_6)
+# define INIT_ARCH()
+
 /* If the vDSO is not available we fall back to syscall.  */
 libc_ifunc_hidden (__gettimeofday_type, __gettimeofday,
-		   (_dl_vdso_vsym ("__vdso_gettimeofday", &linux26)
-		    ?: &__gettimeofday_syscall))
+		   (get_vdso_symbol ("__vdso_gettimeofday")
+		    ?: __gettimeofday_syscall));
 libc_hidden_def (__gettimeofday)
 
 #else
diff --git a/sysdeps/unix/sysv/linux/x86/time.c b/sysdeps/unix/sysv/linux/x86/time.c
index 3d72488500..60e6d1b7c0 100644
--- a/sysdeps/unix/sysv/linux/x86/time.c
+++ b/sysdeps/unix/sysv/linux/x86/time.c
@@ -22,6 +22,7 @@ 
 
 #include <dl-vdso.h>
 #include <errno.h>
+#include <sysdep-vdso.h>
 
 static time_t
 __time_syscall (time_t *t)
@@ -38,11 +39,11 @@  __time_syscall (time_t *t)
 # endif
 
 #undef INIT_ARCH
-#define INIT_ARCH() PREPARE_VERSION_KNOWN (linux26, LINUX_2_6);
+#define INIT_ARCH()
+
 /* If the vDSO is not available we fall back on the syscall.  */
 libc_ifunc_hidden (time_type, time,
-		   (_dl_vdso_vsym ("__vdso_time", &linux26)
-		    ?:  &__time_syscall))
+		   (get_vdso_symbol ("__vdso_time") ?: __time_syscall))
 libc_hidden_def (time)
 
 #else
diff --git a/sysdeps/unix/sysv/linux/x86_64/init-first.c b/sysdeps/unix/sysv/linux/x86_64/init-first.c
index 85333e5ff3..aede1c858d 100644
--- a/sysdeps/unix/sysv/linux/x86_64/init-first.c
+++ b/sysdeps/unix/sysv/linux/x86_64/init-first.c
@@ -32,15 +32,13 @@  extern __typeof (clock_gettime) __syscall_clock_gettime attribute_hidden;
 static inline void
 __vdso_platform_setup (void)
 {
-  PREPARE_VERSION_KNOWN (linux26, LINUX_2_6);
-
-  void *p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux26);
+  void *p = get_vdso_symbol ("__vdso_clock_gettime");
   if (p == NULL)
     p = __syscall_clock_gettime;
   PTR_MANGLE (p);
   VDSO_SYMBOL(clock_gettime) = p;
 
-  p = _dl_vdso_vsym ("__vdso_getcpu", &linux26);
+  p = get_vdso_symbol ("__vdso_getcpu");
   PTR_MANGLE (p);
   VDSO_SYMBOL(getcpu) = p;
 }
diff --git a/sysdeps/unix/sysv/linux/x86_64/sysdep.h b/sysdeps/unix/sysv/linux/x86_64/sysdep.h
index 0a3ddd37e1..197329f4dc 100644
--- a/sysdeps/unix/sysv/linux/x86_64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/x86_64/sysdep.h
@@ -370,6 +370,9 @@ 
 # undef INTERNAL_SYSCALL_ERRNO
 # define INTERNAL_SYSCALL_ERRNO(val, err)	(-(val))
 
+# define VDSO_NAME  "LINUX_2.6"
+# define VDSO_HASH  61765110
+
 /* List of system calls which are supported as vsyscalls.  */
 # define HAVE_CLOCK_GETTIME_VSYSCALL    1
 # define HAVE_GETTIMEOFDAY_VSYSCALL     1