CEEMAIN has been extended; see Figure 1 for the format of the old CEEMAIN and the extensions. Bits 30 and 31 are used to differentiate between the two. The 'ctl' field will be one for the extended CEEMAIN.
Figure 1. Format of CEEMAIN
| +0 | 0x02 | 0x00 | 0x00 | 0x01 |
| +4 | A(main entry point) | |||
| +8 | A(EDCINPL) | |||
|
Q(environment), or -1 if no environment | |||
| +0 | 0x03 | 0x00 | 0x00 | 0x01 |
| +4 | A(main entry point) | |||
| +8 | A(EDCINPL) | |||
|
A(environment) | |||