[PATCH] tile: add vDSO support for gettimeofday()

[Chris Metcalf <cmetcalf at tilera dot com>]

---
 ports/sysdeps/unix/sysv/linux/tile/Makefile        |    4 +++
 .../sysdeps/unix/sysv/linux/tile/bits/libc-vdso.h  |   30 ++++++++++++++++
 ports/sysdeps/unix/sysv/linux/tile/gettimeofday.c  |   38 ++++++++++++++++++++
 ports/sysdeps/unix/sysv/linux/tile/init-first.c    |   34 ++++++++++++++++++
 4 files changed, 106 insertions(+)
 create mode 100644 ports/sysdeps/unix/sysv/linux/tile/bits/libc-vdso.h
 create mode 100644 ports/sysdeps/unix/sysv/linux/tile/gettimeofday.c
 create mode 100644 ports/sysdeps/unix/sysv/linux/tile/init-first.c

diff --git a/ports/sysdeps/unix/sysv/linux/tile/Makefile b/ports/sysdeps/unix/sysv/linux/tile/Makefile
index 0cbfdd0..1c0c968 100644
--- a/ports/sysdeps/unix/sysv/linux/tile/Makefile
+++ b/ports/sysdeps/unix/sysv/linux/tile/Makefile
@@ -13,3 +13,7 @@ sysdep_headers += sys/dataplane.h
 sysdep_routines += set_dataplane
 
 endif
+
+ifeq ($(subdir),elf)
+sysdep_routines += dl-vdso
+endif
diff --git a/ports/sysdeps/unix/sysv/linux/tile/bits/libc-vdso.h b/ports/sysdeps/unix/sysv/linux/tile/bits/libc-vdso.h
new file mode 100644
index 0000000..b972720
--- /dev/null
+++ b/ports/sysdeps/unix/sysv/linux/tile/bits/libc-vdso.h
@@ -0,0 +1,30 @@
+/* Resolve function pointers to VDSO functions.
+   Copyright (C) 2012 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/>.  */
+
+
+#ifndef _LIBC_VDSO_H
+#define _LIBC_VDSO_H
+
+#ifdef SHARED
+
+extern long int (*__vdso_gettimeofday) (struct timeval *, void *)
+  attribute_hidden;
+
+#endif
+
+#endif /* _LIBC_VDSO_H */
diff --git a/ports/sysdeps/unix/sysv/linux/tile/gettimeofday.c b/ports/sysdeps/unix/sysv/linux/tile/gettimeofday.c
new file mode 100644
index 0000000..95a9d34
--- /dev/null
+++ b/ports/sysdeps/unix/sysv/linux/tile/gettimeofday.c
@@ -0,0 +1,38 @@
+/* Copyright (C) 2012 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/>.  */
+
+#include <sysdep.h>
+#include <stddef.h>
+#include <sys/time.h>
+#include <time.h>
+
+#undef __gettimeofday
+#include <bits/libc-vdso.h>
+
+int
+__gettimeofday (struct timeval *tv, struct timezone *tz)
+{
+#if SHARED
+  /* If the vDSO is available we use it. */
+  if (__vdso_gettimeofday != NULL)
+    return __vdso_gettimeofday (tv, tz);
+#endif
+  return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
+}
+
+strong_alias (__gettimeofday, __gettimeofday_internal)
+weak_alias (__gettimeofday, gettimeofday)
diff --git a/ports/sysdeps/unix/sysv/linux/tile/init-first.c b/ports/sysdeps/unix/sysv/linux/tile/init-first.c
new file mode 100644
index 0000000..58b6533
--- /dev/null
+++ b/ports/sysdeps/unix/sysv/linux/tile/init-first.c
@@ -0,0 +1,34 @@
+/* Copyright (C) 2012 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/>.  */
+
+#ifdef SHARED
+#include <dl-vdso.h>
+#include <bits/libc-vdso.h>
+
+long int (*__vdso_gettimeofday) (struct timeval *, void *) 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);
+}
+
+#define VDSO_SETUP _libc_vdso_platform_setup
+#endif
+
+#include "../init-first.c"
-- 
1.7.10.3