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, 242 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/arm/nptl/sysdep-cancel.h b/sysdeps/unix/sysv/linux/arm/nptl/sysdep-cancel.h
new file mode 100644
index 0000000000..118e6c3466
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/nptl/sysdep-cancel.h
@@ -0,0 +1,242 @@
+/* Copyright (C) 2003-2014 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>
+#include <tls.h>
+#ifndef __ASSEMBLER__
+# include <nptl/pthreadP.h>
+#endif
+
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
+
+/* NOTE: We do mark syscalls with unwind annotations, for the benefit of
+   cancellation; but they're really only accurate at the point of the
+   syscall.  The ARM unwind directives are not rich enough without adding
+   a custom personality function.  */
+
+# undef PSEUDO
+# define PSEUDO(name, syscall_name, args)				\
+	.text;								\
+  ENTRY (__##syscall_name##_nocancel);					\
+	CFI_SECTIONS;							\
+	DO_CALL (syscall_name, args);					\
+	cmn	r0, $4096;						\
+	PSEUDO_RET;							\
+  END (__##syscall_name##_nocancel);					\
+  ENTRY (name);								\
+	SINGLE_THREAD_P;						\
+	DOARGS_##args;							\
+	bne .Lpseudo_cancel;						\
+	cfi_remember_state;						\
+	ldr	r7, =SYS_ify (syscall_name);				\
+	swi	0x0;							\
+	UNDOARGS_##args;						\
+	cmn	r0, $4096;						\
+	PSEUDO_RET;							\
+	cfi_restore_state;						\
+  .Lpseudo_cancel:							\
+	.fnstart;	/* matched by the .fnend in UNDOARGS below.  */	\
+	DOCARGS_##args;	/* save syscall args etc. around CENABLE.  */	\
+	CENABLE;							\
+	mov ip, r0;		/* put mask in safe place.  */		\
+	UNDOCARGS_##args;	/* restore syscall args.  */		\
+	ldr	r7, =SYS_ify (syscall_name);				\
+	swi	0x0;		/* do the call.  */			\
+	mov	r7, r0;		/* save syscall return value.  */	\
+	mov	r0, ip;		/* get mask back.  */			\
+	CDISABLE;							\
+	mov	r0, r7;		/* retrieve return value.  */		\
+	RESTORE_LR_##args;						\
+	UNDOARGS_##args;						\
+	cmn	r0, $4096
+
+/* DOARGS pushes eight bytes on the stack for five arguments, twelve bytes for
+   six arguments, and four bytes for fewer.  In order to preserve doubleword
+   alignment, sometimes we must save an extra register.  */
+
+# define RESTART_UNWIND				\
+	.fnend;					\
+	.fnstart;				\
+	.save	{r7};				\
+	.save	{lr}
+
+# define DOCARGS_0				\
+	.save {r7};				\
+	push	{lr};				\
+	cfi_adjust_cfa_offset (4);		\
+	cfi_rel_offset (lr, 0);			\
+	.save	{lr}
+# define UNDOCARGS_0
+# define RESTORE_LR_0				\
+	pop	{lr};				\
+	cfi_adjust_cfa_offset (-4);		\
+	cfi_restore (lr)
+
+# define DOCARGS_1				\
+	.save	{r7};				\
+	push	{r0, r1, lr};			\
+	cfi_adjust_cfa_offset (12);		\
+	cfi_rel_offset (lr, 8);			\
+	.save	{lr};				\
+	.pad	#8
+# define UNDOCARGS_1				\
+	ldr r0, [sp], #8;			\
+	cfi_adjust_cfa_offset (-8);		\
+	RESTART_UNWIND
+# define RESTORE_LR_1				\
+	RESTORE_LR_0
+
+# define DOCARGS_2				\
+	.save	{r7};				\
+	push	{r0, r1, lr};			\
+	cfi_adjust_cfa_offset (12);		\
+	cfi_rel_offset (lr, 8);			\
+	.save	{lr};				\
+	.pad	#8
+# define UNDOCARGS_2				\
+	pop	{r0, r1};			\
+	cfi_adjust_cfa_offset (-8);		\
+	RESTART_UNWIND
+# define RESTORE_LR_2				\
+	RESTORE_LR_0
+
+# define DOCARGS_3				\
+	.save	{r7};				\
+	push	{r0, r1, r2, r3, lr};		\
+	cfi_adjust_cfa_offset (20);		\
+	cfi_rel_offset (lr, 16);		\
+	.save	{lr};				\
+	.pad	#16
+# define UNDOCARGS_3				\
+	pop	{r0, r1, r2, r3};		\
+	cfi_adjust_cfa_offset (-16);		\
+	RESTART_UNWIND
+# define RESTORE_LR_3				\
+	RESTORE_LR_0
+
+# define DOCARGS_4				\
+	.save	{r7};				\
+	push	{r0, r1, r2, r3, lr};		\
+	cfi_adjust_cfa_offset (20);		\
+	cfi_rel_offset (lr, 16);		\
+	.save	{lr};				\
+	.pad	#16
+# define UNDOCARGS_4				\
+	pop	{r0, r1, r2, r3};		\
+	cfi_adjust_cfa_offset (-16);		\
+	RESTART_UNWIND
+# define RESTORE_LR_4				\
+	RESTORE_LR_0
+
+/* r4 is only stmfd'ed for correct stack alignment.  */
+# define DOCARGS_5				\
+	.save	{r4, r7};			\
+	push	{r0, r1, r2, r3, r4, lr};	\
+	cfi_adjust_cfa_offset (24);		\
+	cfi_rel_offset (lr, 20);		\
+	.save	{lr};				\
+	.pad	#20
+# define UNDOCARGS_5				\
+	pop	{r0, r1, r2, r3};		\
+	cfi_adjust_cfa_offset (-16);		\
+	.fnend;					\
+	.fnstart;				\
+	.save	{r4, r7};			\
+	.save	{lr};				\
+	.pad	#4
+# define RESTORE_LR_5				\
+	pop	{r4, lr};			\
+	cfi_adjust_cfa_offset (-8);		\
+	/* r4 will be marked as restored later.  */ \
+	cfi_restore (lr)
+
+# define DOCARGS_6				\
+	.save	{r4, r5, r7};			\
+	push	{r0, r1, r2, r3, lr};		\
+	cfi_adjust_cfa_offset (20);		\
+	cfi_rel_offset (lr, 16);		\
+	.save	{lr};				\
+	.pad	#16
+# define UNDOCARGS_6				\
+	pop	{r0, r1, r2, r3};		\
+	cfi_adjust_cfa_offset (-16);		\
+	.fnend;					\
+	.fnstart;				\
+	.save	{r4, r5, r7};			\
+	.save	{lr};
+# define RESTORE_LR_6				\
+	RESTORE_LR_0
+
+# ifdef IS_IN_libpthread
+#  define CENABLE	bl PLTJMP(__pthread_enable_asynccancel)
+#  define CDISABLE	bl PLTJMP(__pthread_disable_asynccancel)
+#  define __local_multiple_threads __pthread_multiple_threads
+# elif !defined NOT_IN_libc
+#  define CENABLE	bl PLTJMP(__libc_enable_asynccancel)
+#  define CDISABLE	bl PLTJMP(__libc_disable_asynccancel)
+#  define __local_multiple_threads __libc_multiple_threads
+# elif defined IS_IN_librt
+#  define CENABLE	bl PLTJMP(__librt_enable_asynccancel)
+#  define CDISABLE	bl PLTJMP(__librt_disable_asynccancel)
+# else
+#  error Unsupported library
+# endif
+
+# if defined IS_IN_libpthread || !defined NOT_IN_libc
+#  ifndef __ASSEMBLER__
+extern int __local_multiple_threads attribute_hidden;
+#   define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
+#  else
+#   define SINGLE_THREAD_P						\
+	LDST_PCREL(ldr, ip, ip, __local_multiple_threads);		\
+	teq ip, #0
+#  endif
+# else
+/*  There is no __local_multiple_threads for librt, so use the TCB.  */
+#  ifndef __ASSEMBLER__
+#   define SINGLE_THREAD_P						\
+  __builtin_expect (THREAD_GETMEM (THREAD_SELF,				\
+				   header.multiple_threads) == 0, 1)
+#  else
+#   define SINGLE_THREAD_P						\
+	push	{r0, lr};						\
+	cfi_adjust_cfa_offset (8);					\
+	cfi_rel_offset (lr, 4);						\
+	GET_TLS (lr);							\
+	NEGOFF_ADJ_BASE (r0, MULTIPLE_THREADS_OFFSET);			\
+	ldr	ip, NEGOFF_OFF1 (r0, MULTIPLE_THREADS_OFFSET);		\
+	pop	{r0, lr};						\
+	cfi_adjust_cfa_offset (-8);					\
+	cfi_restore (lr);						\
+	teq	ip, #0
+#   define SINGLE_THREAD_P_PIC(x) SINGLE_THREAD_P
+#  endif
+# endif
+
+#elif !defined __ASSEMBLER__
+
+/* For rtld, et cetera.  */
+# define SINGLE_THREAD_P 1
+# define NO_CANCELLATION 1
+
+#endif
+
+#ifndef __ASSEMBLER__
+# define RTLD_SINGLE_THREAD_P \
+  __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
+				   header.multiple_threads) == 0, 1)
+#endif