Implement aarch64 support

- IFUNC support is not implemented, the rest works well.  The only
  other failure is in wide char functions, and that occurs on x86_64
  as well.

Author: Petr Machata

configure.ac

@@ -1,6 +1,6 @@
 # -*- Autoconf -*-
 # This file is part of ltrace.
-# Copyright (C) 2010,2012,2013 Petr Machata, Red Hat Inc.
+# Copyright (C) 2010,2012,2013,2014 Petr Machata, Red Hat Inc.
 # Copyright (C) 2010,2011 Joe Damato
 # Copyright (C) 2010 Marc Kleine-Budde
 # Copyright (C) 2010 Zachary T Welch
@@ -399,6 +399,7 @@ AC_CONFIG_FILES([
 	Makefile
 	sysdeps/Makefile
 	sysdeps/linux-gnu/Makefile
+	sysdeps/linux-gnu/aarch64/Makefile
 	sysdeps/linux-gnu/alpha/Makefile
 	sysdeps/linux-gnu/arm/Makefile
 	sysdeps/linux-gnu/cris/Makefile

sysdeps/linux-gnu/Makefile.am

@@ -1,4 +1,5 @@
 # This file is part of ltrace.
+# Copyright (C) 2014 Petr Machata, Red Hat, Inc.
 # Copyright (C) 2010,2012 Marc Kleine-Budde, Pengutronix
 #
 # This program is free software; you can redistribute it and/or
@@ -16,7 +17,8 @@
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 # 02110-1301 USA
 
-DIST_SUBDIRS = alpha arm cris ia64 m68k metag mips ppc s390 sparc x86
+DIST_SUBDIRS = aarch64 alpha arm cris ia64 m68k metag mips ppc s390	\
+	       sparc x86
 
 SUBDIRS = \
 	$(HOST_CPU)

sysdeps/linux-gnu/aarch64/Makefile.am

@@ -0,0 +1,25 @@
+# This file is part of ltrace.
+# Copyright (C) 2014 Petr Machata, Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+#
+# This program 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
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+noinst_LTLIBRARIES = ../libcpu.la
+
+___libcpu_la_SOURCES = fetch.c plt.c regs.c trace.c
+
+noinst_HEADERS = arch.h ptrace.h signalent.h syscallent.h
+
+MAINTAINERCLEANFILES = Makefile.in

sysdeps/linux-gnu/aarch64/arch.h

@@ -0,0 +1,37 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2014 Petr Machata, Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+#ifndef LTRACE_AARCH64_ARCH_H
+#define LTRACE_AARCH64_ARCH_H
+
+/* | 31                 21 | 20       5 | 4       0 | *
+ * | 1 1 0 1 0 1 0 0 0 0 1 |    imm16   | 0 0 0 0 0 | */
+#define BREAKPOINT_VALUE { 0xd4, 0x20, 0, 0 }
+#define BREAKPOINT_LENGTH 4
+#define DECR_PC_AFTER_BREAK 0
+
+#define LT_ELFCLASS	ELFCLASS64
+#define LT_ELF_MACHINE	EM_AARCH64
+
+#define ARCH_HAVE_FETCH_ARG
+#define ARCH_ENDIAN_BIG
+#define ARCH_HAVE_SIZEOF
+#define ARCH_HAVE_ALIGNOF
+
+#endif /* LTRACE_AARCH64_ARCH_H */