Use this system macro to change the operating state of the central
processing unit (CPU) from supervisor state to problem state. The
normal use for this macro is to reset the CPU state following a MONTC
macro.
See MONTC-Set Supervisor State (Monitor Mode) for more information about the MONTC macro.
Format
- label
- A symbolic name can be assigned to the macro statement.
Entry Requirements
R9 must contain the address of the ECB being processed.
Return Conditions
- Control is returned to the next sequential instruction (NSI).
- The contents of R14 and R15 are unknown. The contents of registers
R0 through R7 are preserved across this macro call. If R10 or R13 are
needed by the calling program, they must be saved and restored across the
macro call.
- The CPU is in problem state (PSW bit 15 = 1).
- The storage protect key is one (PSW bits 8 - 11 = 1).
Programming Considerations
- This macro can be run on any I-stream.
- This macro is for system programming use only.
Examples
None.