Consolidate vDSO macros and usage

This patch consolidate the Linux vDSO define and usage across all ports
that uses it.  The common vDSO definitions and calling through
{INLINE/INTERNAL}_VSYSCALL macros are moved to a common header
sysdep-vdso.h and vDSO name declaration and prototype is defined
using a common macro.

Also PTR_{MANGLE,DEMANGLE} is added to ports that does not use them
for vDSO calls (aarch64, powerpc, s390, and tile) and thus it will
reflect in code changes.  For ports that already implement pointer
mangling/demangling in vDSO system (i386, x32, x86_64) this patch
is mainly a code refactor.

Checked on x32, x86_64, x32, ppc64le, and aarch64.

1 files changed, 12 insertions, 6 deletions

diff --git a/sysdeps/unix/sysv/linux/tile/init-first.c b/sysdeps/unix/sysv/linux/tile/init-first.c
index 6b0e26a35e..29356c21bb 100644
--- a/sysdeps/unix/sysv/linux/tile/init-first.c
+++ b/sysdeps/unix/sysv/linux/tile/init-first.c
@@ -19,21 +19,27 @@
 #include <dl-vdso.h>
 #include <libc-vdso.h>
 
-struct syscall_return_value (*__vdso_gettimeofday) (struct timeval *, void *)
+struct syscall_return_value (*VDSO_SYMBOL(gettimeofday)) (struct timeval *,
+							  void *)
   attribute_hidden;
 
-struct syscall_return_value (*__vdso_clock_gettime) (clockid_t,
-                                                     struct timespec *)
+struct syscall_return_value (*VDSO_SYMBOL(clock_gettime)) (clockid_t,
+                                                           struct timespec *)
   __attribute__ ((nocommon));
-strong_alias (__vdso_clock_gettime, __GI___vdso_clock_gettime attribute_hidden)
 
 
 static inline void
 _libc_vdso_platform_setup (void)
 {
   PREPARE_VERSION (linux26, "LINUX_2.6", 61765110);
-  __vdso_gettimeofday = _dl_vdso_vsym ("__vdso_gettimeofday", &linux26);
-  __vdso_clock_gettime = _dl_vdso_vsym ("__vdso_clock_gettime", &linux26);
+
+  void *p = _dl_vdso_vsym ("__vdso_gettimeofday", &linux26);
+  PTR_MANGLE (p);
+  VDSO_SYMBOL (gettimeofday) = p;
+
+  p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux26);
+  PTR_MANGLE (p);
+  VDSO_SYMBOL (clock_gettime) = p;
 }
 
 #define VDSO_SETUP _libc_vdso_platform_setup