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, 112 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/arm/sys/ucontext.h b/sysdeps/unix/sysv/linux/arm/sys/ucontext.h
new file mode 100644
index 0000000000..dbda8303cb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/sys/ucontext.h
@@ -0,0 +1,112 @@
+/* Copyright (C) 1998-2014 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/>.  */
+
+/* System V/ARM ABI compliant context switching support.  */
+
+#ifndef _SYS_UCONTEXT_H
+#define _SYS_UCONTEXT_H	1
+
+#include <features.h>
+#include <signal.h>
+
+/* We need the signal context definitions even if they are not used
+   included in <signal.h>.  */
+#include <bits/sigcontext.h>
+
+typedef int greg_t;
+
+/* Number of general registers.  */
+#define NGREG	18
+
+/* Container for all general registers.  */
+typedef greg_t gregset_t[NGREG];
+
+/* Number of each register is the `gregset_t' array.  */
+enum
+{
+  REG_R0 = 0,
+#define REG_R0	REG_R0
+  REG_R1 = 1,
+#define REG_R1	REG_R1
+  REG_R2 = 2,
+#define REG_R2	REG_R2
+  REG_R3 = 3,
+#define REG_R3	REG_R3
+  REG_R4 = 4,
+#define REG_R4	REG_R4
+  REG_R5 = 5,
+#define REG_R5	REG_R5
+  REG_R6 = 6,
+#define REG_R6	REG_R6
+  REG_R7 = 7,
+#define REG_R7	REG_R7
+  REG_R8 = 8,
+#define REG_R8	REG_R8
+  REG_R9 = 9,
+#define REG_R9	REG_R9
+  REG_R10 = 10,
+#define REG_R10	REG_R10
+  REG_R11 = 11,
+#define REG_R11	REG_R11
+  REG_R12 = 12,
+#define REG_R12	REG_R12
+  REG_R13 = 13,
+#define REG_R13	REG_R13
+  REG_R14 = 14,
+#define REG_R14	REG_R14
+  REG_R15 = 15
+#define REG_R15	REG_R15
+};
+
+struct _libc_fpstate
+{
+  struct
+  {
+    unsigned int sign1:1;
+    unsigned int unused:15;
+    unsigned int sign2:1;
+    unsigned int exponent:14;
+    unsigned int j:1;
+    unsigned int mantissa1:31;
+    unsigned int mantissa0:32;
+  } fpregs[8];
+  unsigned int fpsr:32;
+  unsigned int fpcr:32;
+  unsigned char ftype[8];
+  unsigned int init_flag;
+};
+/* Structure to describe FPU registers.  */
+typedef struct _libc_fpstate fpregset_t;
+
+/* Context to describe whole processor state.  This only describes
+   the core registers; coprocessor registers get saved elsewhere
+   (e.g. in uc_regspace, or somewhere unspecified on the stack
+   during non-RT signal handlers).  */
+typedef struct sigcontext mcontext_t;
+
+/* Userlevel context.  */
+typedef struct ucontext
+  {
+    unsigned long uc_flags;
+    struct ucontext *uc_link;
+    stack_t uc_stack;
+    mcontext_t uc_mcontext;
+    __sigset_t uc_sigmask;
+    unsigned long uc_regspace[128] __attribute__((__aligned__(8)));
+  } ucontext_t;
+
+#endif /* sys/ucontext.h */