The gas cost of invocation of that host call.
NOTE: ((reg: HostCallRegisters) => Gas) function is for compatibility reasons: pre GP 0.7.2
Currently executing service id.
Index of that host call (i.e. what PVM invokes via ecalli)
Input&Output registers that we should add to tracing log.
Actually execute the host call.
NOTE the call is ALLOWED and expected to modify registers and memory.
Copy a piece of local memory into nested PVM instance (machine).
https://graypaper.fluffylabs.dev/#/7e6ff6a/340403340403?v=0.6.7