Handle signal inside enclave

[dominions]

I am trying to handle signals inside the enclave. I notice that Asylo modified SGX SDK to support handling signals inside the enclave.
Therefore, I follow the patches of intel/linux-sgx#222 and intel/linux-sgx#223 to modify SGX sdk 2.13 .
But the program crashed when the signal handler function ECALL into the enclave with cssa = 1 even I increase the STATIC_STACK_SIZE size.
If there are other codes need to be modified to support this feature?
Looking forward to your reply.