Return codes

A return code is provided in register 15 and can contain the following values:

0: The environment was activated and the routine called.
4: The function code is not valid.
12: The indicated environment was initialized for main routines. No routine was executed.
16: The token is not valid.
28: The enclave was terminated but the process level persists.
This value indicates the enclave was terminated while the process was retained. This can occur due to a STOP or EXIT statement (or an exit() function) being issued or due to an unhandled condition. The sub_ret_code, sub_reason_code, and sub_feedback_code indicate this action.
32: The function_pointer passed is not a valid function pointer.
48: CELQPIPI was called from a non-64-bit environment.
52: The function_pointer could not be obtained from the routine_addr.