| rax | 120 | create a new child proccess | 8 bit |
| rbx | flags | Proccess flags | 32 bit |
| rcx | *stack | top of childes stack if something gets shared, else NULL is sufficient | 32 bit |
| On return | rax |
| PID, TID, of the child | |
| 0 | |
| errorcode |
| Errorcode | c++ name | Description |
| 11 | EAGAIN | Try again |
| 16 | EBUSY | Device or resource busy |