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, 98 insertions, 0 deletions

diff --git a/sysdeps/aarch64/sysdep.h b/sysdeps/aarch64/sysdep.h
new file mode 100644
index 0000000000..7169ba716c
--- /dev/null
+++ b/sysdeps/aarch64/sysdep.h
@@ -0,0 +1,98 @@
+/* Copyright (C) 1997-2014 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 <sysdeps/generic/sysdep.h>
+
+#ifdef	__ASSEMBLER__
+
+/* Syntactic details of assembler.  */
+
+#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
+
+/* Define an entry point visible from C.  */
+#define ENTRY(name)						\
+  .globl C_SYMBOL_NAME(name);					\
+  .type C_SYMBOL_NAME(name),%function;				\
+  .align 4;							\
+  C_LABEL(name)							\
+  cfi_startproc;						\
+  CALL_MCOUNT
+
+/* Define an entry point visible from C.  */
+#define ENTRY_ALIGN(name, align)				\
+  .globl C_SYMBOL_NAME(name);					\
+  .type C_SYMBOL_NAME(name),%function;				\
+  .p2align align;						\
+  C_LABEL(name)							\
+  cfi_startproc;						\
+  CALL_MCOUNT
+
+/* Define an entry point visible from C with a specified alignment and
+   pre-padding with NOPs.  This can be used to ensure that a critical
+   loop within a function is cache line aligned.  Note this version
+   does not adjust the padding if CALL_MCOUNT is defined. */
+
+#define ENTRY_ALIGN_AND_PAD(name, align, padding)		\
+  .globl C_SYMBOL_NAME(name);					\
+  .type C_SYMBOL_NAME(name),%function;				\
+  .p2align align;						\
+  .rep padding;							\
+  nop;								\
+  .endr;							\
+  C_LABEL(name)							\
+  cfi_startproc;						\
+  CALL_MCOUNT
+
+#undef	END
+#define END(name)						\
+  cfi_endproc;							\
+  ASM_SIZE_DIRECTIVE(name)
+
+/* If compiled for profiling, call `mcount' at the start of each function.  */
+#ifdef	PROF
+# define CALL_MCOUNT						\
+	str	x30, [sp, #-16]!;				\
+	bl	mcount;						\
+	ldr	x30, [sp], #16	;
+#else
+# define CALL_MCOUNT		/* Do nothing.  */
+#endif
+
+/* Local label name for asm code.  */
+#ifndef L
+# define L(name)         .L##name
+#endif
+
+/* Load or store to/from a pc-relative EXPR into/from R, using T.  */
+#define LDST_PCREL(OP, R, T, EXPR)  \
+	adrp	T, EXPR;	    \
+	OP	R, [T, #:lo12:EXPR];\
+
+/* Load or store to/from a got-relative EXPR into/from R, using T.  */
+#define LDST_GLOBAL(OP, R, T, EXPR)     \
+	adrp	T, :got:EXPR;		\
+	ldr	T, [T, #:got_lo12:EXPR];\
+	OP	R, [T];
+
+/* Since C identifiers are not normally prefixed with an underscore
+   on this system, the asm identifier `syscall_error' intrudes on the
+   C name space.  Make sure we use an innocuous name.  */
+#define syscall_error	__syscall_error
+#define mcount		_mcount
+
+#endif	/* __ASSEMBLER__ */