Add unit test for s390x

tests/unit/test_s390x.c

@@ -3,4 +3,32 @@
 const uint64_t code_start = 0x1000;
 const uint64_t code_len = 0x4000;
 
-TEST_LIST = {{NULL, NULL}};
+static void uc_common_setup(uc_engine **uc, uc_arch arch, uc_mode mode,
+                            const char *code, uint64_t size)
+{
+    OK(uc_open(arch, mode, uc));
+    OK(uc_mem_map(*uc, code_start, code_len, UC_PROT_ALL));
+    OK(uc_mem_write(*uc, code_start, code, size));
+}
+
+static void test_s390x_lr()
+{
+    char code[] = "\x18\x23"; // lr %r2, %r3
+    uint64_t r_r2, r_r3 = 0x114514;
+    uc_engine *uc;
+
+    uc_common_setup(&uc, UC_ARCH_S390X, UC_MODE_BIG_ENDIAN, code,
+                    sizeof(code) - 1);
+
+    OK(uc_reg_write(uc, UC_S390X_REG_R3, &r_r3));
+
+    OK(uc_emu_start(uc, code_start, code_start + sizeof(code) - 1, 0, 0));
+
+    OK(uc_reg_read(uc, UC_S390X_REG_R2, &r_r2));
+
+    TEST_CHECK(r_r2 == 0x114514);
+
+    OK(uc_close(uc));
+}
+
+TEST_LIST = {{"test_s390x_lr", test_s390x_lr}};