added ARM64 hang test

tests/unit/test_hang.c

@@ -0,0 +1,58 @@
+/*
+	refer to issue #575.
+	to run correctly unicorn needs to be compiled for AArch64.
+*/
+
+#include "unicorn_test.h"
+#include <stdio.h>
+
+uint64_t trunc_page(uint64_t addr)
+{
+	return (addr & ~(4095));
+}
+
+int main(void)
+{
+	uint32_t code[] = {
+        0xd503201f, /* NOP */
+        0xd503201f, /* NOP */
+        0xd503201f, /* NOP */
+        0xaa0103e0  /* MOV X0, X1 */
+    };
+
+    uc_engine *uc;
+
+    uint64_t x0 = 0;
+    uint64_t x1 = 1;
+
+    if (uc_open(UC_ARCH_ARM64, UC_MODE_ARM, &uc) != UC_ERR_OK) {
+        printf("Error on open. Be sure that your unicorn library supports AArch64.\n");
+        return -1;
+    }
+
+    uint64_t addr = 0x13f0;
+    uint64_t trunc_addr = trunc_page(addr);    // round down to nearest page
+
+    uc_mem_map(uc, trunc_addr, 2 * 1024 * 1024, UC_PROT_ALL);
+
+    if (uc_mem_write(uc, addr, &code, sizeof(code))) {
+        printf("error on write\n");
+        return -2;
+    }
+
+    uc_reg_write(uc, UC_ARM64_REG_X0, &x0);
+    uc_reg_write(uc, UC_ARM64_REG_X1, &x1);
+
+    if (uc_emu_start(uc, addr, addr + sizeof(code), 0, 0)) {
+        printf("error on start\n");
+        return -3;
+    }
+
+    uc_reg_read(uc, UC_ARM64_REG_X0, &x0);
+    uc_reg_read(uc, UC_ARM64_REG_X1, &x1);
+
+    printf("x0: %#llx\n", x0);
+    printf("x1: %#llx\n", x1);
+
+	return 0;
+}