添加异常信息打印

riscv/main.c

@@ -44,13 +44,15 @@ int main()
 {
   int a=1;
   int b=2;
-  // typedef void (*fun_t)(void);
-  // fun_t fun = (fun_t)0xffffffff;
-  // fun();
+  typedef void (*fun_t)(void);
+  fun_t fun = (fun_t)0;
+  fun();
   int c = add(a, b);
   my_printf("Hello World! %s\n", "Andy");
   my_printf("add(%d, %d)=%d\n", a, b, c);
   a = 67;b = -78;
+  fun=(fun_t)0xff000000;
+  fun();
   my_printf("mul(%d, %d)=%d\n", a, b, a * b);
   my_printf("ram_val test: %s\n", g_string);
   set_csr(mstatus, 0x00000008);