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CCS5.4调试出现的问题

在调试C28M3H52C1ARM端的程序时,程序会在运行某一函数时,跳到中断死循环里:请问这个触发这个中断的中断源是什么?


//*****************************************************************************
// This is the code that gets called when the processor receives a fault
// interrupt.  This simply enters an infinite loop, preserving the system state
// for examination by a debugger.
//*****************************************************************************
static void
FaultISR(void)
{
    // Enter an infinite loop.
    while(1)
    {
    }
}

我在单步调试程序时,在某一函数的末尾会跳出来

No source available for "0x2a" 。在单步进行下一步就会进入上面的中断,  这个是表示什么意思啊?求指点!!