Move mips from ports to libc.

I've moved the MIPS port from ports to the main sysdeps hierarchy.
Beyond the README update, the move of the files was simply

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

and in addition to the ChangeLog entries here, I put a note at the top
of ports/ChangeLog.mips similar to those in other files.

Tested that disassembly of installed shared libraries for mips is the
same before and after this patch (except for ld.so where paths in
assertions are involved, as for arm).

	* sysdeps/mips: Move directory from ports/sysdeps/mips.
	* sysdeps/unix/mips: Move directory from ports/sysdeps/unix/mips.
	* sysdeps/unix/sysv/linux/mips: Move directory from
	ports/sysdeps/unix/sysv/linux/mips.
	* README: Update listing for mips-*-linux-gnu and
	mips64-*-linux-gnu.

	* sysdeps/mips: Move directory to ../sysdeps/mips.
	* sysdeps/unix/mips: Move directory to ../sysdeps/unix/mips.
	* sysdeps/unix/sysv/linux/mips: Move directory to
	../sysdeps/unix/sysv/linux/mips.

1 files changed, 67 insertions, 0 deletions

diff --git a/sysdeps/mips/bits/nan.h b/sysdeps/mips/bits/nan.h
new file mode 100644
index 0000000000..80067ea145
--- /dev/null
+++ b/sysdeps/mips/bits/nan.h
@@ -0,0 +1,67 @@
+/* `NAN' constant for IEEE 754 machines.  MIPS version.
+   Copyright (C) 1992-2014 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 _MATH_H
+# error "Never use <bits/nan.h> directly; include <math.h> instead."
+#endif
+
+
+/* IEEE Not A Number.  */
+/* In legacy-NaN mode MIPS has the qNaN and sNaN patterns reversed
+   compared to most other architectures.  IEEE 754-1985 left the
+   definition of this open to implementations, and for MIPS the top bit
+   of the mantissa must be SET to indicate a sNaN.  In 2008-NaN mode
+   MIPS aligned to IEEE 754-2008.  */
+
+#if __GNUC_PREREQ(3,3)
+
+# define NAN	(__builtin_nanf (""))
+
+#elif defined __GNUC__
+
+/* No 2008-NaN mode support in any GCC version before 4.9.  */
+
+# define NAN \
+  (__extension__							      \
+   ((union { unsigned __l __attribute__ ((__mode__ (__SI__))); float __d; })  \
+    { __l: 0x7fbfffffUL }).__d)
+
+#else
+
+# include <endian.h>
+
+# if __BYTE_ORDER == __BIG_ENDIAN
+#  ifdef __mips_nan2008
+#   define __qnan_bytes		{ 0x7f, 0xc0, 0, 0 }
+#  else
+#   define __qnan_bytes		{ 0x7f, 0xbf, 0xff, 0xff }
+#  endif
+# endif
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+#  ifdef __mips_nan2008
+#   define __qnan_bytes		{ 0, 0, 0xc0, 0x7f }
+#  else
+#   define __qnan_bytes		{ 0xff, 0xff, 0xbf, 0x7f }
+#  endif
+# endif
+
+static union { unsigned char __c[4]; float __d; } __qnan_union
+  __attribute__ ((__unused__)) = { __qnan_bytes };
+# define NAN	(__qnan_union.__d)
+
+#endif	/* GCC.  */