Function wapc_guest::__host_call

pub unsafe extern "C" fn __host_call(
    bd_ptr: *const u8, 
    bd_len: usize, 
    ns_ptr: *const u8, 
    ns_len: usize, 
    op_ptr: *const u8, 
    op_len: usize, 
    ptr: *const u8, 
    len: usize
) -> usize