10 请问如何查看入栈时保存的寄存器的值？

#define LED0_PIN    GET_PIN(F, 9)
#define LED1_PIN    GET_PIN(F, 10)
ALIGN(RT_ALIGN_SIZE)
 char thread2_stack[160];
 struct rt_thread thread2;
 char thread1_stack[160];
 struct rt_thread thread1;
/* 线程 2 入口 */
static void thread2_entry(void *param)
{
    rt_uint32_t count = 0;
    while(1)
    {
        count++;
        count++;
        rt_pin_write(LED0_PIN, PIN_HIGH);
        rt_thread_mdelay(500);
        rt_pin_write(LED0_PIN, PIN_LOW);
        rt_thread_mdelay(500);
    }
}
/* 线程 2 入口 */
static void thread1_entry(void *param)
{
    rt_uint32_t count = 0;
    while(1)
    {
        count++;
        count++;
        rt_pin_write(LED1_PIN, PIN_HIGH);
        rt_thread_mdelay(500);
        rt_pin_write(LED1_PIN, PIN_LOW);
        rt_thread_mdelay(500);
    }
}
int main(void)
{
    /* set LED0 pin mode to output */
    rt_pin_mode(LED0_PIN, PIN_MODE_OUTPUT);
    rt_pin_mode(LED1_PIN, PIN_MODE_OUTPUT);
     /* 初始化线程 2，名称是 thread2，入口是 thread2_entry */
    rt_thread_init(&thread2,
                   "thread2",
                   thread2_entry,
                   RT_NULL,
                   &thread2_stack[0],
                   sizeof(thread2_stack),
                   21, 20);
                    /* 初始化线程 1，名称是 thread1，入口是 thread1_entry */
    rt_thread_init(&thread1,
                   "thread1",
                   thread1_entry,
                   RT_NULL,
                   &thread1_stack[0],
                   sizeof(thread1_stack),
                   21, 20);
    rt_thread_startup(&thread1);
    rt_thread_startup(&thread2);
}