ADSTOP use the ADSTOP command to halt the execution of a virtual machine at a
virtual instruction address. Execution halts when the instruction at
the address specified in the command is the next instruction to be
executed. Only one ADSTOP eommand can be in effect at a given time. If
a second ADSTOO command is issued, the previous ADSTOP setting is
canceled. The format of the ADSTOP command is:
r------- ADSTOP {
hexloc } OFF L _______ _ hexlLc is the hexadecimal representation of the virtual instruction
address where execution is to be halted a OFF cancels any pEevious ADSTOP setting.
1. When halts, the CP command mode is entered and a message
is displayed. this point, you may invoke other debugging
commands. To resume operation of the virtual machine, issue the BEGIN Once an ADSTOP location is set, it is removed (tuEned off) by the following: • Reaching the virtual storaqe location specified in the ADSTOP command • Performing a virtual IPL or SYSTEM RESET • Issuinq the ADSTOP OFF command • specifvinq a different location with a new ADsrop hexloc command
2. Since the ADSTOP function modifies storage by placing a CP SVC X'B3' at the specified location, you should not: • Desiqnate an address within a shared segment. If a shared
segment is modified by an ADS TOP command, a warninq message is
issued to the user and the virtual machine is unshared from
(qiven a private copy of) the named system. other users of the
seqment continue to operate with an unchanged copy of that
segment. • Use the TPACE command with the INSTRUCT, BRANCH, or ALL operands a traced instruction is located at the ADSTO? address. Section 5. Format of CP 45

ADSTOP 3. Address stop (ADSTOP hexloc) is specified as a virtual machine real address. For CS/VS or DOS/VS, the specified address must be in
fixed storage. Movement of the page containing the !DSTOP can
cause erroneous processing because the resulting SV: X'B3' is presented to the virtual machine for handling. U. If the SVC handling portion of the virtual machine assist feature is enabled on your virtual machine, CP turns it off when an ADSTOP is set. when the address stop is removed, CP returns the assist
featJre SVC handling to its previous status. The SET RUN OFF command should be issued before an command. ADSTOP AT xxx xxx
The instruction whose address is xxxxxx is the next instruction scheduled for execution. The virtual machine is in a stopped
state. Anv CP command (including an ADSTOP command to set the next
address stop) can be issued. Enter the CP command BEGIN to resume
execution at the instruction location xxxxxx, or at any other
location desired. UG IBM CP Command for General Jsers