virtual o?eratinq system, is responsible for converting any second level storage aldresses to first level storage addresses before including them
in the specific command line. STOPP1N3 EXECUTION OF YOUR VIRTUAL MACHINE
To stop execution of your virtual machine at a given address in virtual
storage, use the ADSTOP command and specify the hexadecimal address of a
virtual instruction. The command: #cp adstop 3000 stops the virtual machine when the instruction 3000 is the next instruction to be executed.
runninq, you receive the message: AT 3000 at hexadecimal location When the machine stops
and YO'lr terminal is placed in CP console function mode. At this point,
you can enter other CP debugging commands to display and alter storage or to tra=e certain instructions. When you want to resume running your
virtual machine, enter:
begin Unlike the hardware address stop, ADSTOP is turned off when: • The address is reached. • The next ADSTOP command is issued. • An 1PL or a system reset is performed. • The ADSTOP OFF command is issued. While is on, the SVC portion
executed. When ADSTOP is turned off,
machine assist. DISPLAYING VIRTUAL STORAGE of virtual machine assist is not SVcs are again handled by virtual contents of virtual storage, storage keys, general registers,
floating-point reqisters, control registers (if in EC mode), PSi, CAW, and CSW can be displayed on your terminal via the DISPLAY command. All
but the and csw can be printed on the Spooled virtual printer via
the ryUMP The DISPLAY and DUMP commands are fully described in Section 5. The
examples that follow do not attempt to show all possible uses.
TERMINAL OUTPUT With the DISPLAY command, you can display virtual storage at your
terminal in either of the following formats: • Four byte qroups, aligned on fullword boundaries, hexadecimal format, printel four fullwords per line. IB' VM/370 CP Command Reference for General Users

• 16 byte qroups, aliqned on 16 byte boundaries, hexadeGimal format, printel four fullwords plus EBCDIC translation per line.
For the first format, enter the DISPLAY command as:
you receive the response: 001024 xxxxxxxx xxxxxxxx xxxxxxxx
For the seGond format, enter the command as: display t1026-102c ana the response is:
(E BCDI C trans.) 001020 xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx * •••••••••••••••• * You can also specify the area of storage to be displayed by entering
a hexalecimal byte count such as:
display 1024.12 The response displays 20 bytes as follows: 001024 xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx 001034 xxxxxxxx BYTE ALIGNMENT ON TERMINAL OUTPUT The previous responses illustrate the byte alignment that takes place in
each of the two display formats.
If the first location to be displayed is not on the appropriate 4 or 10 byte boanaary, it is rounded down to the next lower boundary that
applies. If the last location to be displayed does not fall at the end of the appropriate 4 or 16 hyte group, it is rounded up to the end of that
qroup.
If you enter:
display k1024-3200 the keys that are assigned to each 2K segment of the specified
storaqe area are displayed. contiquous 2K segment with identical
storaqe keys are combined; for example, the response could have been: 001000 T8 OQ27FF KFY=FO 002800 TO 003800 KEY=EO To lisplay all storaqe keys, enter:
display k Section 3. CP Command Usage 29