Move tilegx, tilepro, and linux-generic from ports to libc.

I've moved the TILE-Gx and TILEPro ports to the main sysdeps hierarchy,
along with the linux-generic ports infrastructure.  Beyond the README
update, the move was just

    git mv ports/sysdeps/tile sysdeps/tile
    git mv ports/sysdeps/unix/sysv/linux/tile \
      sysdeps/unix/sysv/linux/tile
    git mv ports/sysdeps/unix/sysv/linux/generic \
      sysdeps/unix/sysv/linux/generic

I updated the relevant ChangeLogs along the lines of the ARM move
in commit c6bfe5c4d75 and tested the 64-bit tilegx build to confirm that
there were no changes in "objdump -dr" output in the shared objects.

1 files changed, 42 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/tile/ucontext_i.h b/sysdeps/unix/sysv/linux/tile/ucontext_i.h
new file mode 100644
index 0000000000..fe329cdbd6
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tile/ucontext_i.h
@@ -0,0 +1,42 @@
+/* Copyright (C) 2011-2014 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/>.  */
+
+/* Definitions of offsets within the ucontext_t structure.  Note
+   that for convenience we use __SIZEOF_POINTER__ for "long" and
+   "ssize_t" fields (and their unsigned counterparts) as well.  */
+
+#define UC_FLAGS_OFFSET 0
+#define UC_LINK_OFFSET (UC_FLAGS_OFFSET + __SIZEOF_POINTER__)
+#define UC_STACK_SP_OFFSET (UC_LINK_OFFSET + __SIZEOF_POINTER__)
+#define UC_STACK_FLAGS_OFFSET (UC_STACK_SP_OFFSET + __SIZEOF_POINTER__)
+#define UC_STACK_SIZE_OFFSET (UC_STACK_FLAGS_OFFSET + __SIZEOF_POINTER__)
+#define UC_STACK_MCONTEXT_OFFSET \
+  ((UC_STACK_SIZE_OFFSET + __SIZEOF_POINTER__ + REGSIZE - 1) & -REGSIZE)
+#define UC_REG(i) (UC_STACK_MCONTEXT_OFFSET + ((i) * REGSIZE))
+#define UC_NREGS 64
+#define UC_SIGMASK_OFFSET UC_REG(UC_NREGS)
+#define UC_SIZE (UC_SIGMASK_OFFSET + (_NSIG / 8))
+
+/* From <asm/siginfo.h> */
+#define SI_MAX_SIZE	128
+
+/* From <asm/signal.h> */
+#define _NSIG		64
+#define SIG_BLOCK          0	/* for blocking signals */
+#define SIG_UNBLOCK        1	/* for unblocking signals */
+#define SIG_SETMASK        2	/* for setting the signal mask */