On Sun, 17 Aug 2025 11:08:32 -0500, Joe Monk <[email protected]> wrote:
>"At the begining of a rmode64 pgm to look at the register values and
>register 15 didn’t have the entry point "
>
>Correct.
Incorrect, the doc clearly says AMODE64 (not RMODE64). I wonder how IBM handled
the transition of existing AMODE64 programs.
When the subtask routine is to run in 64-bit addressing mode, it is expected to
use relative branching and register 15 contains a value that can be used to
determine the addressing mode of the issuer of the ATTACH or ATTACHX macro as
follows:
Issuer AMODE 24: X'FFFFF000'
Issuer AMODE 31: X'FFFFF002'
Issuer AMODE 64: X'FFFFF004'
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