Remove tilegx port.

Since tile support has been removed from the Linux kernel for 4.17,
this patch removes the (unmaintained) port to tilegx from glibc (the
tilepro support having been previously removed).  This reflects the
general principle that a glibc port needs upstream support for the
architecture in all the components it build-depends on (so binutils,
GCC and the Linux kernel, for the normal case of a port supporting the
Linux kernel but no other OS), in order to be maintainable.

Apart from removal of sysdeps/tile and sysdeps/unix/sysv/linux/tile,
there are updates to various comments referencing tile for which
removal of those references seemed appropriate.  The configuration is
removed from README and from build-many-glibcs.py.  contrib.texi keeps
mention of removed contributions, but I updated Chris Metcalf's entry
to reflect that he also contributed the non-removed support for the
generic Linux kernel syscall interface.
__ASSUME_FADVISE64_64_NO_ALIGN support is removed, as it was only used
by tile.

	* sysdeps/tile: Remove.
	* sysdeps/unix/sysv/linux/tile: Likewise.
	* README (tilegx-*-linux-gnu): Remove from list of supported
	configurations.
	* manual/contrib.texi (Contributors): Mention Chris Metcalf's
	contribution of support for generic Linux kernel syscall
	interface.
	* scripts/build-many-glibcs.py (Context.add_all_configs): Remove
	tilegx configurations.
	(Config.install_linux_headers): Do not handle tile.
	* sysdeps/unix/sysv/linux/aarch64/ldsodefs.h: Do not mention Tile
	in comment.
	* sysdeps/unix/sysv/linux/nios2/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/posix_fadvise.c: Likewise.
	[__ASSUME_FADVISE64_64_NO_ALIGN] (__ALIGNMENT_ARG): Remove
	conditional undefine and redefine.
	* sysdeps/unix/sysv/linux/posix_fadvise64.c: Do not mention Tile
	in comment.
	[__ASSUME_FADVISE64_64_NO_ALIGN] (__ALIGNMENT_ARG): Remove
	conditional undefine and redefine.

1 files changed, 0 insertions, 110 deletions

diff --git a/sysdeps/tile/atomic-machine.h b/sysdeps/tile/atomic-machine.h
deleted file mode 100644
index 482b460c8c..0000000000
--- a/sysdeps/tile/atomic-machine.h
+++ /dev/null
@@ -1,110 +0,0 @@
-/* Copyright (C) 2011-2018 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
-
-   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 _ATOMIC_MACHINE_H
-#define _ATOMIC_MACHINE_H       1
-
-#include <stdint.h>
-#include <features.h>
-#include <arch/spr_def.h>
-
-typedef int32_t atomic32_t;
-typedef uint32_t uatomic32_t;
-typedef int_fast32_t atomic_fast32_t;
-typedef uint_fast32_t uatomic_fast32_t;
-
-typedef int64_t atomic64_t;
-typedef uint64_t uatomic64_t;
-typedef int_fast64_t atomic_fast64_t;
-typedef uint_fast64_t uatomic_fast64_t;
-
-typedef intptr_t atomicptr_t;
-typedef uintptr_t uatomicptr_t;
-typedef intmax_t atomic_max_t;
-typedef uintmax_t uatomic_max_t;
-
-#ifdef _LP64
-# define __HAVE_64B_ATOMICS 1
-#else
-/* tilegx32 does have 64-bit atomics, but assumptions in the semaphore
-   code mean that unaligned 64-bit atomics will be used if this symbol
-   is true, and unaligned atomics are not supported on tile.  */
-# define __HAVE_64B_ATOMICS 0
-#endif
-
-#define USE_ATOMIC_COMPILER_BUILTINS 0
-#define ATOMIC_EXCHANGE_USES_CAS 0
-
-/* Pick appropriate 8- or 4-byte instruction. */
-#define __atomic_update(mem, v, op)                                     \
-  ((__typeof (*(mem))) (__typeof (*(mem) - *(mem)))                     \
-   ((sizeof (*(mem)) == 8) ?                                            \
-    __insn_##op ((void *) (mem), (int64_t) (__typeof((v) - (v))) (v)) : \
-    (sizeof (*(mem)) == 4) ?                                            \
-    __insn_##op##4 ((void *) (mem), (int32_t) (__typeof ((v) - (v))) (v)) : \
-    __atomic_error_bad_argument_size()))
-
-#define atomic_compare_and_exchange_val_acq(mem, n, o)                  \
-  ({ __insn_mtspr (SPR_CMPEXCH_VALUE, (int64_t) (__typeof ((o) - (o))) (o)); \
-     __atomic_update (mem, n, cmpexch); })
-#define atomic_exchange_acq(mem, newvalue) \
-  __atomic_update (mem, newvalue, exch)
-#define atomic_exchange_and_add(mem, value) \
-  __atomic_update (mem, value, fetchadd)
-#define atomic_and_val(mem, mask) \
-  __atomic_update (mem, mask, fetchand)
-#define atomic_or_val(mem, mask) \
-  __atomic_update (mem, mask, fetchor)
-#define atomic_decrement_if_positive(mem) \
-  __atomic_update (mem, -1, fetchaddgez)
-
-/* Barrier macro. */
-#define atomic_full_barrier() __sync_synchronize()
-
-/* APIs with "release" semantics. */
-#define atomic_compare_and_exchange_val_rel(mem, n, o)          \
-  ({                                                            \
-    atomic_full_barrier ();                                     \
-    atomic_compare_and_exchange_val_acq ((mem), (n), (o));      \
-  })
-#define atomic_exchange_rel(mem, n)                             \
-  ({                                                            \
-    atomic_full_barrier ();                                     \
-    atomic_exchange_acq ((mem), (n));                           \
-  })
-
-/* Various macros that should just be synonyms. */
-#define catomic_exchange_and_add atomic_exchange_and_add
-#define atomic_and(mem, mask) ((void) atomic_and_val ((mem), (mask)))
-#define catomic_and atomic_and
-#define atomic_or(mem, mask) ((void) atomic_or_val ((mem), (mask)))
-#define catomic_or atomic_or
-
-/* atomic_bit_test_set in terms of atomic_or_val. */
-#define atomic_bit_test_set(mem, bit)                                   \
-  ({ __typeof (*(mem)) __att0_mask = ((__typeof (*(mem))) 1 << (bit));  \
-    atomic_or_val ((mem), __att0_mask) & __att0_mask; })
-
-/*
- * This non-existent symbol is called for unsupporrted sizes,
- * indicating a bug in the caller.
- */
-extern int __atomic_error_bad_argument_size(void)
-  __attribute__ ((warning ("bad sizeof atomic argument")));
-
-#endif /* _ATOMIC_MACHINE_H  */