z/VM: CP Commands and Utilities Reference - z/VM - IBM

HCPLDR Control Statements and Output
1. Padding helps in debugging a program. If a program references unspecified
areas, you can detect such references by padding with a value of X'F0' or some
similar value.
Parameter Control Statement
The parameter control statement supplies a parameter string that a loaded system
uses upon execution.
Format:
1 2–4 5–72
X'02' PRM parmstring
Where:
X'02'
must appear in column 1.
PRM
is the parameter control statement acronym.
parmstring
is a parameter string having a 2-byte length field followed by the parameter.
When the system begins execution, general purpose register one addresses
this parameter string.
Subsystem Control Statement
The subsystem control statement specifies a subsystem and the location within a
virtual machine where the subsystem appears. Such a subsystem is a separately
loaded system, having its own relocation, page boundaries, cross reference listings,
and load maps. However, the system loader loads the subsystem as a part of the
main system. Use such a “system loaded within a system” for stand-alone
programs. You can load the programs as part of the CP nucleus.
Format:
1 2–4 5–72
X'02' SYS name [loc]
Where:
X'02'
must appear in column 1.
SYS
is the subsystem control statement acronym.
name
is the name of the subsystem.
loc
1904 z/VM: CP Commands and Utilities Reference
is the location where the subsystem appears in the virtual machine. If omitted,
the location is 0.