On entry to the configuration change exit routine, the general purpose registers (GPRs) contain the following information:
| Register | Contents |
|---|---|
| GPR 0 | Undefined |
| GPR 1 | Address of a pointer to the exit parameter list |
| GPRs 2-13 | Undefined |
| GPR 14 | Return address |
| GPR 15 | Entry point address of the configuration change exit |