Cross-partition data processing method and device

The invention discloses a cross-partition data processing method and device. The method comprises the steps of: when a task in a first partition generates a cross-partition function call request, switching the memory access permission of the first partition to the initial memory access permission of the second partition, calling the target function, and recovering the memory access permission of the first partition to the initial memory access permission after calling is finished. According to the initial memory access permission, the task in each partition can only perform write operation onthe memory space corresponding to the partition, so that each partition only needs to occupy one register resource in the MPU, and the consumption of the register resources can be reduced; when the target function is called, the memory access permission of the first partition is switched into the initial memory access permission of the second partition, and after calling is completed, the memory access permission of the first partition is recovered to the initial memory access permission of the first partition, so that the target function can be prevented from unexpectedly accessing the memoryspace corresponding to the first partition, and the possibility of data security problems is reduced.