dar(数据地址寄存器)包含处理器尝试访问的地址，这一行为将引发页面错误。

The dar (Data address Register) contains the address that the processor tried to access, which then caused a page fault.

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在调试信号时，需要查看的一些重要寄存器包括GPR、指令指针(NIP)、机器状态寄存器(MSR)、Trap、数据地址寄存器(DAR)等等。

Important registers to look for when debugging through signals are the GPRs, instruction pointer (NIP), machine state register (MSR), trap, data address register (DAR), and so on.

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在SIGILL的情况中，DAR可能不会提供任何有用的数据，因为这个寄存器在SIGSEGV的情况中就被用来存放故障地址。

In the case of SIGILL, the DAR might not provide useful data, because this register is used to store the fault address in the case of SIGSEGV.

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