December 2006
Intermediate to advanced
228 pages
6h 20m
English
book
Introduction to the New Mainframe: Large-Scale Commercial Computing
by Mike Ebbers, Pilar Gonzalez Adrados, Frank Byrne, Rodney Martin, Jon Veilleux
Content preview from Introduction to the New Mainframe: Large-Scale Commercial Computing
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Chapter 4. Integrity and security 83
If a program attempts to access storage in a key that is different than the one it
has been designated to use, the operating system will abend (Abnormal END)
the program. The storage protection key for a program is defined in the program
status word (PSW), which is an operating system element that controls program
execution. See “The program status word” on page 162 for more information
about this topic.
4.3.8 Supervisor call
A supervisor call (SVC) is a special privileged instruction that interrupts the
program being run and passes control to the supervisor so that it can perform the
specific service indicated by the instruction. The supervisor can be called by
other programs, such as problem state programs, ...
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