m68k: Remove vDSO support

Although defined in initial TLS/NPTL ABI for m68k and ColdFire [1], kernel
support was never pushed upstream.  This patch removes the unused m68k
vDSO support.

Checked with a build against m68k and m68k-coldfire and some basic
tests on ARAnyM.

	* sysdeps/unix/sysv/linux/m68k/Makefile (sysdep_routines,
	sysdep-rtld-routines): Remove rules.
	* sysdeps/unix/sysv/linux/m68k/Versions (libc) [GLIBC_PRIVATE]:
	Remove __vdso_atomic_cmpxchg_32 and __vdso_atomic_barrier.
	(ld) [GLIBC_PRIVATE]: __rtld___vdso_read_tp,
	__rtld___vdso_atomic_cmpxchg_32, and __rtld___vdso_atomic_barrier.
	* sysdeps/unix/sysv/linux/m68k/coldfire/atomic-machine.h
	(atomic_compare_and_exchange_val_acq, atomic_full_barrier): Remove
	vDSO path for SHARED.
	* sysdeps/unix/sysv/linux/m68k/init-first.c: Remove file.
	* sysdeps/unix/sysv/linux/m68k/libc-m68k-vdso.c: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m68k-helpers.S: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m68k-vdso.c: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m68k-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m68k-helpers.c: New file.

[1] https://lists.debian.org/debian-68k/2007/11/msg00071.html

1 files changed, 0 insertions, 74 deletions

diff --git a/sysdeps/unix/sysv/linux/m68k/init-first.c b/sysdeps/unix/sysv/linux/m68k/init-first.c
deleted file mode 100644
index f8f0910839..0000000000
--- a/sysdeps/unix/sysv/linux/m68k/init-first.c
+++ /dev/null
@@ -1,74 +0,0 @@
-/* Initialization code run first thing by the ELF startup code.  Linux/m68k.
-   Copyright (C) 2010-2019 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
-
-   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/>.  */
-
-/* Note: linking in vDSO to a static binary requires changes to
-   the main GLIBC proper.  Not yet implemented.  */
-#ifdef SHARED
-
-#include <dl-vdso.h>
-#include <m68k-vdso.h>
-
-static inline void
-_libc_vdso_platform_setup (void)
-{
-  void *p;
-
-  PREPARE_VERSION (linux26, "LINUX_2.6", 61765110);
-
-  /* It may happen that rtld didn't initialize the vDSO, so fallback
-     to the syscall implementations if _dl_vdso_vsym returns NULL.
-     This may happen when a static executable dlopen's a dynamic library.
-     This really is nothing more than a workaround for rtld/csu
-     deficiency.  Ideally, init code would setup the vDSO for static
-     binaries too.  */
-
-  p = _dl_vdso_vsym ("__kernel_read_tp", &linux26);
-  if (p != NULL)
-    {
-      __vdso_read_tp = p;
-      __rtld___vdso_read_tp = p;
-    }
-  else
-    assert (__vdso_read_tp == (void *) __vdso_read_tp_stub);
-
-  p = _dl_vdso_vsym ("__kernel_atomic_cmpxchg_32", &linux26);
-  if (p != NULL)
-    {
-      __vdso_atomic_cmpxchg_32 = p;
-      __rtld___vdso_atomic_cmpxchg_32 = p;
-    }
-  else
-    assert (__vdso_atomic_cmpxchg_32
-	    == (void *) __vdso_atomic_cmpxchg_32_stub);
-
-  p = _dl_vdso_vsym ("__kernel_atomic_barrier", &linux26);
-  if (p != NULL)
-    {
-      __vdso_atomic_barrier = p;
-      __rtld___vdso_atomic_barrier = p;
-    }
-  else
-    assert (__vdso_atomic_barrier == (void *) __vdso_atomic_barrier_stub);
-}
-
-#define VDSO_SETUP _libc_vdso_platform_setup
-
-#endif /* SHARED */
-
-#include <csu/init-first.c>