Relocate AArch64 from ports to libc.

This patch moves the AArch64 port to the main sysdeps hierarchy.  The
move is essentially:

  git mv ports/sysdeps/aarch64 sysdeps/aarch64
  git mv ports/sysdeps/unix/sysv/linux/aarch64 sysdeps/unix/sysv/linux/aarch64

The README is updated and I've updated ChangeLog.aarch64 along the
lines of the ARM move.  The AArch64 build has been tested to confirm
that there were no changes in objdump -dr output or the shared
objects.

1 files changed, 74 insertions, 0 deletions

diff --git a/sysdeps/aarch64/bits/fenv.h b/sysdeps/aarch64/bits/fenv.h
new file mode 100644
index 0000000000..8c884cbef4
--- /dev/null
+++ b/sysdeps/aarch64/bits/fenv.h
@@ -0,0 +1,74 @@
+/* Copyright (C) 2004-2014 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 _FENV_H
+# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
+#endif
+
+/* Define bits representing exceptions in the FPSR status word.  */
+enum
+  {
+    FE_INVALID =
+#define FE_INVALID	1
+      FE_INVALID,
+    FE_DIVBYZERO =
+#define FE_DIVBYZERO	2
+      FE_DIVBYZERO,
+    FE_OVERFLOW =
+#define FE_OVERFLOW	4
+      FE_OVERFLOW,
+    FE_UNDERFLOW =
+#define FE_UNDERFLOW	8
+      FE_UNDERFLOW,
+    FE_INEXACT =
+#define FE_INEXACT	16
+      FE_INEXACT,
+  };
+
+/* Amount to shift by to convert an exception bit in FPSR to a an
+   exception bit mask in FPCR.  */
+#define FE_EXCEPT_SHIFT	8
+
+/* All supported exceptions.  */
+#define FE_ALL_EXCEPT	\
+	(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
+
+/* Define bits representing rounding modes in the FPCR Rmode field.  */
+#define FE_TONEAREST  0x000000
+#define FE_UPWARD     0x400000
+#define FE_DOWNWARD   0x800000
+#define FE_TOWARDZERO 0xc00000
+
+/* Type representing exception flags. */
+typedef unsigned int fexcept_t;
+
+/* Type representing floating-point environment.  */
+typedef struct
+  {
+    unsigned int __fpcr;
+    unsigned int __fpsr;
+  }
+fenv_t;
+
+/* If the default argument is used we use this value.  */
+#define FE_DFL_ENV	((const fenv_t *) -1l)
+
+#ifdef __USE_GNU
+/* Floating-point environment where none of the exceptions are masked.  */
+# define FE_NOMASK_ENV  ((const fenv_t *) -2)
+#endif