Function encode_upcall_trd64bit_ptr 

pub unsafe fn encode_upcall_trd64bit_ptr(
    upcall: &FunctionCall,
    a0: *mut u64,
    a1: *mut u64,
    a2: *mut u64,
    a3: *mut u64,
)

Encode the upcall arguments into 4 registers compatible with TRD-RISCV64.

Use pointer writes.

Safety

All pointers a0, a1, a2, a3 must point to valid, aligned, and writable memory locations.