因为前9个向量对xgate而言是空的。请参见xgate.cxgate源文件中的向量表及注释: const XGATE_TableEntry XGATE_VectorTable[] = { // Channel # = Vector address / 2 /* channel 0..8 are not used, first used must match macro XGATE_VECTOR_OFFSET in xgate.h */ {ErrorHandler, 0x09}, // Channel 09 - Reserved {ErrorHandler, 0x0A}, // Channel 0A - Reserved .... ... |