Relocate AArch64 from ports to libc.

This patch moves the AArch64 port to the main sysdeps hierarchy.  The
move is essentially:

  git mv ports/sysdeps/aarch64 sysdeps/aarch64
  git mv ports/sysdeps/unix/sysv/linux/aarch64 sysdeps/unix/sysv/linux/aarch64

The README is updated and I've updated ChangeLog.aarch64 along the
lines of the ARM move.  The AArch64 build has been tested to confirm
that there were no changes in objdump -dr output or the shared
objects.

1 files changed, 205 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h b/sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h
new file mode 100644
index 0000000000..f6903b5dd8
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h
@@ -0,0 +1,205 @@
+/* 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
+
+# undef PSEUDO
+# define PSEUDO(name, syscall_name, args)				\
+  .section ".text";							\
+  .type __##syscall_name##_nocancel,%function;				\
+  .globl __##syscall_name##_nocancel;					\
+  __##syscall_name##_nocancel:						\
+    cfi_startproc;							\
+    DO_CALL (syscall_name, args);					\
+    PSEUDO_RET;								\
+    cfi_endproc;							\
+    .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel;	\
+  ENTRY (name);								\
+    SINGLE_THREAD_P;							\
+    DOARGS_##args;							\
+    bne .Lpseudo_cancel;						\
+    DO_CALL (syscall_name, 0);						\
+    UNDOARGS_##args;							\
+    cmn x0, 4095;							\
+    PSEUDO_RET;								\
+  .Lpseudo_cancel:							\
+    DOCARGS_##args;	/* save syscall args etc. around CENABLE.  */	\
+    CENABLE;								\
+    mov x16, x0;	/* put mask in safe place.  */			\
+    UNDOCARGS_##args;	/* restore syscall args.  */			\
+    mov x8, SYS_ify (syscall_name);	/* do the call.  */		\
+    svc	0;								\
+    str x0, [sp, -16]!;	/* save syscall return value.  */		\
+    cfi_adjust_cfa_offset (16);						\
+    mov x0, x16;	 /* get mask back.  */				\
+    CDISABLE;								\
+    ldr x0, [sp], 16;							\
+    cfi_adjust_cfa_offset (-16);					\
+    ldr x30, [sp], 16;							\
+    cfi_adjust_cfa_offset (-16);					\
+    cfi_restore (x30);							\
+    UNDOARGS_##args;							\
+    cmn x0, 4095;
+
+# define DOCARGS_0							\
+	str x30, [sp, -16]!;						\
+	cfi_adjust_cfa_offset (16);					\
+	cfi_rel_offset (x30, 0)
+
+# define UNDOCARGS_0
+
+# define DOCARGS_1							\
+	DOCARGS_0;							\
+	str x0, [sp, -16]!;						\
+	cfi_adjust_cfa_offset (16);					\
+	cfi_rel_offset (x0, 0)
+
+# define UNDOCARGS_1							\
+	ldr x0, [sp], 16;						\
+	cfi_restore (x0);						\
+	cfi_adjust_cfa_offset (-16);					\
+
+# define DOCARGS_2							\
+	DOCARGS_1;							\
+	str x1, [sp, -16]!;						\
+	cfi_adjust_cfa_offset (16);					\
+	cfi_rel_offset (x1, 0)
+
+# define UNDOCARGS_2							\
+	ldr x1, [sp], 16;						\
+	cfi_restore (x1);						\
+	cfi_adjust_cfa_offset (-16);					\
+	UNDOCARGS_1
+
+# define DOCARGS_3							\
+	DOCARGS_2;							\
+	str x2, [sp, -16]!;						\
+	cfi_adjust_cfa_offset (16);					\
+	cfi_rel_offset (x2, 0)
+
+# define UNDOCARGS_3							\
+	ldr x2, [sp], 16;						\
+	cfi_restore (x2);						\
+	cfi_adjust_cfa_offset (-16);					\
+	UNDOCARGS_2
+
+# define DOCARGS_4							\
+	DOCARGS_3;							\
+	str x3, [sp, -16]!;						\
+	cfi_adjust_cfa_offset (16);					\
+	cfi_rel_offset (x3, 0)
+
+# define UNDOCARGS_4							\
+	ldr x3, [sp], 16;						\
+	cfi_restore (x3);						\
+	cfi_adjust_cfa_offset (-16);					\
+	UNDOCARGS_3
+
+# define DOCARGS_5							\
+	DOCARGS_4;							\
+	str x4, [sp, -16]!;						\
+	cfi_adjust_cfa_offset (16);					\
+	cfi_rel_offset (x4, 0)
+
+# define UNDOCARGS_5							\
+	ldr x4, [sp], 16;						\
+	cfi_restore (x4);						\
+	cfi_adjust_cfa_offset (-16);					\
+	UNDOCARGS_4
+
+# define DOCARGS_6							\
+	DOCARGS_5;							\
+	str x5, [sp, -16]!;						\
+	cfi_adjust_cfa_offset (16);					\
+	cfi_rel_offset (x5, 0)
+
+# define UNDOCARGS_6							\
+	ldr x5, [sp], 16;						\
+	cfi_restore (x5);						\
+	cfi_adjust_cfa_offset (-16);					\
+	UNDOCARGS_5
+
+# ifdef IS_IN_libpthread
+#  define CENABLE	bl __pthread_enable_asynccancel
+#  define CDISABLE	bl __pthread_disable_asynccancel
+#  define __local_multiple_threads __pthread_multiple_threads
+# elif !defined NOT_IN_libc
+#  define CENABLE	bl __libc_enable_asynccancel
+#  define CDISABLE	bl __libc_disable_asynccancel
+#  define __local_multiple_threads __libc_multiple_threads
+# elif defined IS_IN_librt
+#  define CENABLE	bl __librt_enable_asynccancel
+#  define CDISABLE	bl __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						\
+  adrp	x16, __local_multiple_threads;					\
+  add	x16, x16, #:lo12:__local_multiple_threads;			\
+  ldr	x16, [x16];							\
+  cmp	x16, 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						\
+  stp	x0, x30, [sp, -16]!;						\
+  cfi_adjust_cfa_offset (16);						\
+  cfi_rel_offset (x0, 0);						\
+  cfi_rel_offset (x30, 8);						\
+  bl	__read_tp;							\
+  sub	x0, x0, PTHREAD_SIZEOF;						\
+  ldr	x16, [x0, PTHREAD_MULTIPLE_THREADS_OFFSET];			\
+  ldp	x0, x30, [sp], 16;						\
+  cfi_restore (x0);							\
+  cfi_restore (x30);							\
+  cfi_adjust_cfa_offset (-16);						\
+  cmp	x16, 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