How to execute OP-TEE cryptographic algorithms directly from ARM Trusted Firmware

I am not a product planning representative.<br />
I'm considering running cryptographic algorithms implemented on R-Car H3 on a boot loader on which Linux is not running.<br />
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I will concretely describe what I can not realize.<br />
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First, when ARM Trusted Firmware jumps to the address where the OP-TEE function exists, an exception will be raised.<br />
After that, "plat_panic_handler" will be in infinite loop state.<br />
I guess that it is probably guarded by MMU, but I do not know how to deal with it.<br />
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Second, About signature verification using key of RSA.<br />
In order to register the key of RSA, I guess using functions like "alloc_rsa_public_key" and "alloc_rsa_keypair" in OP - TEE.<br />
However, I do not know how to use functions such as arguments and procedures.<br />