sgx_trts 1.1.1

# Trusted Runtime System The Intel(R) SGX trusted runtime system (tRTS) is a key component of the Intel(R) Software Guard Extensions SDK. It provides the enclave entry point logic as well as other functions to be used by enclave developers. **Intel(R) Software Guard Extensions Helper Functions** **CustomExceptionHandling** # Intel(R) Software Guard Extensions Helper Functions The tRTS provides the helper functions for you to determine whether a given address is within or outside enclave memory. The tRTS provides a wrapper to the RDRAND instruction to generate a true random number from hardware. enclave developers should use the rsgx_read_rand function to get true random numbers. # CustomExceptionHandling The Intel(R) Software Guard Extensions SDK provides an API to allow you to register functions, or exception handlers, to handle a limited set of hardware exceptions. When one of the enclave supported hardware exceptions occurs within the enclave, the registered exception handlers will be called in a specific order until an exception handler reports that it has handled the exception. For example, issuing a CPUID instruction inside an Enclave will result in a #UD fault (Invalid Opcode Exception). ISV enclave code can call rsgx_register_exception_handler to register a function of type sgx_exception_handler_t to respond to this exception. To check a list of enclave supported exceptions, see Intel(R) Software Guard Extensions Programming Reference. **Note** Custom exception handling is only supported in HW mode. Although the exception handlers can be registered in simulation mode, the exceptions cannot be caught and handled within the enclave. **Note** OCALLs are not allowed in the exception handler. **Note** Custom exception handing only saves general purpose registers in sgx_ exception_info_t. You should be careful when touching other registers in the exception handlers. **Note** If the exception handlers can not handle the exceptions, abort() is called. abort() makes the enclave unusable and generates another exception.