Move arm from ports to libc.

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

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

and in addition to the ChangeLog entries here, I put a note at the top
of ports/ChangeLog.arm similar to that at the top of
ChangeLog.powerpc.  There is deliberately no NEWS change, as I think
it makes the most sense to put in a general note above all ports
having moved if we can achieve that for 2.20.

Tested that disassembly of installed shared libraries for arm is the
same before and after this patch, except for data (not instructions)
in ld.so (there are assertions in sysdeps/arm/dl-machine.h, and the
path by which that file is found, and so by which it appears in the
assertion message, changes as a result of the move).

	* sysdeps/arm: Move directory from ports/sysdeps/arm.
	* sysdeps/unix/arm: Move directory from ports/sysdeps/unix/arm.
	* sysdeps/unix/sysv/linux/arm: Move directory from
	ports/sysdeps/unix/sysv/linux/arm.
	* README: Update listing for arm-*-linux-gnueabi.

ports/ChangeLog.arm:
	* sysdeps/arm: Move directory to ../sysdeps/arm.
	* sysdeps/unix/arm: Move directory to ../sysdeps.arm.
	* sysdeps/unix/sysv/linux/arm: Move directory to
	../sysdeps/unix/sysv/linux/arm.

1 files changed, 79 insertions, 0 deletions

diff --git a/sysdeps/arm/unwind-dw2-fde-glibc.c b/sysdeps/arm/unwind-dw2-fde-glibc.c
new file mode 100644
index 0000000..6b2110c
--- /dev/null
+++ b/sysdeps/arm/unwind-dw2-fde-glibc.c
@@ -0,0 +1,79 @@
+/* Dummy exception handling and frame unwind runtime interface routines.
+   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/>.  */
+
+/* ARM uses setjmp-longjmp exceptions.  However, previous versions of
+   GNU libc exported some DWARF-2 exception handling support routines.
+   They are not necessary, but older (or broken) configurations of GCC
+   will do so.  Even though all references to these are weak, because
+   they refer to versioned symbols, they must be provided.  */
+
+#include <stdlib.h>
+#include <unwind.h>
+#include <unwind-dw2-fde.h>
+
+/* These may be called from startup code, but don't need to do
+   anything.  */
+
+void __register_frame_info_bases (void *a1, struct object *a2,
+				  void *a3, void *a4)
+{
+}
+
+void __register_frame_info (void *a1, struct object *a2)
+{
+}
+
+void __register_frame (void *a1)
+{
+}
+
+void __register_frame_info_table_bases (void *a1, struct object *a2,
+					void *a3, void *a4)
+{
+}
+
+void __register_frame_info_table (void *a1, struct object *a2)
+{
+}
+
+void __register_frame_table (void *a1)
+{
+}
+
+void *__deregister_frame_info (void *a1)
+{
+  return NULL;
+}
+
+void *__deregister_frame_info_bases (void *a1)
+{
+  return NULL;
+}
+
+void __deregister_frame (void *a1)
+{
+}
+
+/* This should not be called.  */
+
+fde *
+_Unwind_Find_FDE (void *a1, struct dwarf_eh_bases *a2)
+{
+  abort ();
+}