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When system returns from exception with ertn instruction, PC comes from LOONGARCH_CSR_ERA, and CSR.CRMD comes LOONGARCH_CSR_PRMD. Here save CSR register CSR.ERA and CSR.PRMD into stack, and then restore them from stack. So it can be modified by exception handlers in future. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>