tcg/aarch64: implement new TCG target for aarch64

add preliminary support for TCG target aarch64.

Signed-off-by: Claudio Fontana <claudio.fontana@huawei.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 51A5C596.3090108@huawei.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

include/exec/exec-all.h

diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 17fde25..b2162a4 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -128,7 +128,7 @@
 
 #if defined(__arm__) || defined(_ARCH_PPC) \
     || defined(__x86_64__) || defined(__i386__) \
-    || defined(__sparc__) \
+    || defined(__sparc__) || defined(__aarch64__) \
     || defined(CONFIG_TCG_INTERPRETER)
 #define USE_DIRECT_JUMP
 #endif
@@ -230,6 +230,9 @@
     *(uint32_t *)jmp_addr = addr - (jmp_addr + 4);
     /* no need to flush icache explicitly */
 }
+#elif defined(__aarch64__)
+void aarch64_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr);
+#define tb_set_jmp_target1 aarch64_tb_set_jmp_target
 #elif defined(__arm__)
 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 {