In AMODE 64, an ATTACH provides control with register 15 (R15)
containing the "OR" value of the addessing-mode constants as shown
in the table below; it does
not contain the module entry point
address as it did in AMODE 31.
Table 1. Register 15 Contents on
Entry in AMODE=64| Addressing-mode Constant |
R15 Contains "OR" Value of: |
|---|
| AsaAmode64CallerAmode31 |
X'00000002' |
| AsaAmode64CallerAmode64 |
X'00000004' |
| AsaAmode64R15BASR_L |
X'FFFFF000' — branch entered |
| AsaAmode64R15BASSM_L |
X'FFFFF001' |