Registers

Before invoking the service, the caller must ensure that the following general purpose registers (GPRs) contain the specified information:

Register

Contents

1

If using a call, the address of 2 fullwords in the primary address space:

First fullword contains the address of an 8-byte time-of-day (TOD) clock value.
In the clock value, bit 0 is treated as on to allow the service to handle values from May 11, 1971, at 11:56:53 to September 17, 2042, at 23:53:47. In the value, the partial microseconds must be truncated and not rounded.
Next fullword contains the address of a 17-byte output area.

Note: If using a LINK macro, specify the addresses of the fullwords in the PARAM parameter.

13

Address of a 72-byte register save area, which is in the primary address space.

14

Return address. Bit 0 must contain 1 to indicate that control is to be returned in 31-bit addressing mode or contain 0 to indicate 24-bit addressing mode.

15

The entry point address of the 17-character time stamp service, BLSUMTOD.