Linux Standard Base Core Specification for S390 2.1 | ||
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The ESA/390 Architecture is specified by the following documents
Only the features of ESA/390 processor instruction set and the following optional instructions may be assumed to be present:
additional floating point facility
compare and move extended facility
immediate and relative instruction facility
string instruction facility
square-root facility
An application is responsible for determining if any additional instruction set features are available before using those additional features. If a feature is not present, then the application may not use it.
Applications may not make system calls directly. The interfaces in the C library must be used instead.
Applications conforming to this specification must provide feedback to the user if a feature that is required for correct execution of the application is not present. Applications conforming to this specification should attempt to execute in a diminished capacity if a required instruction set feature is not present.
This specfication does not provide any performance guarantees of a conforming system. A system conforming to this specification may be implemented in either hardware or software.
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