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, 90 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/arm/____longjmp_chk.S b/sysdeps/unix/sysv/linux/arm/____longjmp_chk.S
new file mode 100644
index 0000000000..96f8b4eb2d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/____longjmp_chk.S
@@ -0,0 +1,90 @@
+/* Copyright (C) 2009-2014 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/>.  */
+
+#include <sysdep.h>
+
+	.section .rodata.str1.1,"aMS",%progbits,1
+	.type	longjmp_msg,%object
+longjmp_msg:
+	.string "longjmp causes uninitialized stack frame"
+	.size	longjmp_msg, .-longjmp_msg
+	.text
+
+#define __longjmp ____longjmp_chk
+
+#ifdef PIC
+# define CALL_FAIL						\
+	ldr	sl, .L_GOT;					\
+	cfi_undefined (sl);					\
+.L_GOT_OFF:							\
+	add	sl, pc, sl;					\
+	ldr	r0, .Lstr;					\
+	add	r0, sl, r0;					\
+	B	PLTJMP(HIDDEN_JUMPTARGET(__fortify_fail));	\
+.L_GOT:								\
+	.word	_GLOBAL_OFFSET_TABLE_-(.L_GOT_OFF+8);		\
+.Lstr:								\
+	.word	longjmp_msg(GOTOFF);
+#else
+# define CALL_FAIL					\
+	ldr	r0, .Lstr;				\
+	B	HIDDEN_JUMPTARGET(__fortify_fail);	\
+.Lstr:							\
+	.word	longjmp_msg;
+#endif
+
+#define CHECK_SP(reg)				\
+	cfi_remember_state;			\
+	cmp	sp, reg;			\
+	bls	.Lok;				\
+	push	{ r7 };				\
+	cfi_adjust_cfa_offset (4);		\
+	cfi_rel_offset (r7, 0);			\
+	mov	r5, r0;				\
+	cfi_undefined (r5);			\
+	mov	r7, #SYS_ify(sigaltstack);	\
+	mov	r0, #0;				\
+	sub	sp, sp, #12; /* == sizeof (stack_t) */ \
+	cfi_adjust_cfa_offset (12);		\
+	cfi_remember_state;			\
+	mov	r1, sp;				\
+	swi	#0;				\
+	cmp	r0, #0;				\
+	bne	.Lok2;				\
+	ldr	r1, [sp, #4];			\
+	tst	r1, #1;				\
+	beq	.Lfail;				\
+	ldr	r2, [sp, #0];			\
+	ldr	r3, [sp, #8];			\
+	add	r2, r2, r3;			\
+	sub	r2, r2, reg;			\
+	cmp	r2, r3;				\
+	bhi	.Lok2;				\
+.Lfail:						\
+	add	sp, sp, #12;			\
+	cfi_adjust_cfa_offset (-12);		\
+	pop	{ r7 };				\
+	cfi_adjust_cfa_offset (-4);		\
+	cfi_restore (r7);			\
+	CALL_FAIL				\
+	cfi_restore_state;			\
+.Lok2:						\
+	mov	r0, r5;				\
+	cfi_restore_state;			\
+.Lok:
+
+#include <__longjmp.S>