Add an AArch64 simulator to GDB.

sim	* configure.tgt: Add aarch64 entry.
	* configure: Regenerate.
	* sim/aarch64/configure.ac: New configure template.
	* sim/aarch64/aclocal.m4: Generate.
	* sim/aarch64/config.in: Generate.
	* sim/aarch64/configure: Generate.
	* sim/aarch64/cpustate.c: New file - functions for accessing
	AArch64 registers.
	* sim/aarch64/cpustate.h: New header.
	* sim/aarch64/decode.h: New header.
	* sim/aarch64/interp.c: New file - interface between GDB and
	simulator.
	* sim/aarch64/Makefile.in: New makefile template.
	* sim/aarch64/memory.c: New file - functions for simulating
	aarch64 memory accesses.
	* sim/aarch64/memory.h: New header.
	* sim/aarch64/sim-main.h: New header.
	* sim/aarch64/simulator.c: New file - aarch64 simulator
	functions.
	* sim/aarch64/simulator.h: New header.

include/gdb * sim-aarch64.h: New file.

sim/test * configure: Regenerate.
	* sim/aarch64: New directory.

sim/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2015-11-24  Nick Clifton  <nickc@redhat.com>
+
+	* configure: Regenerate.
+	* sim/aarch64: New directory.
+
 2015-11-14  Mike Frysinger  <vapier@gentoo.org>
 
 	* lib/sim-defs.exp (slurp_options): Pull in global subdir/srcdir.

sim/testsuite/configure

@@ -1827,6 +1827,9 @@ sim_common=yes
 sim_igen=no
 sim_arch=
 case "${target}" in
+   aarch64*-*-*)
+       sim_arch=aarch64
+       ;;
    arm*-*-*)
        sim_arch=arm
        ;;

sim/testsuite/sim/aarch64/ChangeLog

@@ -0,0 +1,3 @@
+2015-11-24  Nick Clifton  <nickc@redhat.com>
+
+	* pass.s, allinsn.exp, testutils.inc: New files.

sim/testsuite/sim/aarch64/allinsn.exp

@@ -0,0 +1,15 @@
+# AArch64 simulator testsuite
+
+if [istarget aarch64*-*] {
+    # all machines
+    set all_machs "aarch64"
+
+    foreach src [lsort [glob -nocomplain $srcdir/$subdir/*.s]] {
+	# If we're only testing specific files and this isn't one of them,
+	# skip it.
+	if ![runtest_file_p $runtests $src] {
+	    continue
+	}
+	run_sim_test $src $all_machs
+    }
+}

sim/testsuite/sim/aarch64/pass.s

@@ -0,0 +1,7 @@
+# check that the sim doesn't die immediately.
+# mach: aarch64
+
+.include "testutils.inc"
+
+	start
+	pass

sim/testsuite/sim/aarch64/testutils.inc

@@ -0,0 +1,72 @@
+# MACRO: exit
+# Terminates execution.
+	.macro exit nr
+
+	stp	x29, x30, [sp,#-32]!
+	mov	x4, #0x26
+	mov	x7, #\nr
+	mov	x29, sp
+	movk	x4, #0x2, lsl #16
+	add	x1, x29, #0x10
+	str	x4, [x29,#16]
+	str	x7, [x29,#24]
+	mov	w0, #0x18
+	hlt	#0xf000
+
+	.endm
+
+# MACRO: swiwrite
+# Writes the string in X1 to stdout
+	.macro swiwrite len
+	
+	stp	x29, x30, [sp,#-48]!
+	mov	x0, #1
+	mov	x2, #\len
+	mov	x29, sp
+	str	x0, [x29,#24]
+	str	x1, [x29,#32]
+	str	x2, [x29,#40]
+	mov	w0, #0x5
+	add	x1, x29, #0x18
+	hlt	#0xf000
+	ldp	x29, x30, [sp],#48
+	ret
+
+	.endm
+
+# MACRO: pass
+# Write 'pass' to stdout and quit
+	.macro pass
+
+	adrp	x1, .Lpass
+	add	x1, x1, :lo12:.Lpass
+	
+	swiwrite 5
+	exit 0
+
+	.data
+.Lpass:
+	.asciz "pass\n"
+	.endm
+
+# MACRO: fail
+# Write 'fail' to stdout and quit
+	.macro fail
+
+	adrp	x1, .Lfail
+	add	x1, x1, :lo12:.Lfail
+	swiwrite 5
+	exit 0
+
+	.data
+.Lfail:
+	.asciz "fail\n"
+	.endm
+
+# MACRO: start
+# All assembler tests should start with a call to "start"
+	.macro start
+	.text
+.global _start
+_start:
+	.endm