In the IBM System / 360 mainframe family, a Supervisor Call instruction implements a system call for legacy facilities; the Program Call ( PC ) instruction is used for newer facilities.
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The fact that and double-increment the program counter before pushing it to the stack facilitates the technique of treating them as supervisor call instructions, as found on some mainframe computers.
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Indeed, the OS has a special facility for " fast fixing " these short-term fixed data buffers ( fixing which is performed without resorting to a time-consuming Supervisor Call instruction ).
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Thus, to interact with an application running in part as a procedure-call instruction to a code segment to which it had dynamically linked ( a code segment that implemented some operation associated with the daemon ).
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Many RISC machines, as well as the CISC IBM System / 360 and successors, have subroutine call instructions that place the return address in an address register the register-indirect addressing mode is used to return from that subroutine call.
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The PCLATH register supplies high-order instruction address bits when the 8 bits supplied by a write to the PCL register, or the 11 bits supplied by a GOTO or CALL instruction, is not sufficient to address the available ROM space.
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In addition, privileged code can temporarily make an address space unswappable With a SYSEVENT Supervisor Call instruction ( SVC ); certain changes in the address space properties require that the OS swap it out and then swap it back in, using SYSEVENT TRANSWAP.
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Particularly notable are the stack instructions PUSH and POP, and the corresponding stack call instructions PUSHJ and POPJ . The byte instructions use a special format of indirect word to extract and store arbitrary-sized bit fields, possibly advancing a pointer to the next unit.
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The run-time routine then rewrites the instructions, changing the load instruction to load the register with the type of the current receiver, and the call instruction to call the preamble of the target method, now " linking " the call site to the target method.
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When first implemented in CP / CMS release 3.1, this use of DIAG provided an operating system interface that was analogous to the System / 360 Supervisor Call instruction ( SVC ), but that did not require altering or extending the system's virtualization of SVC.
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