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It is the successor to PAL-11 (Program Assembler Loader), an earlier version of the PDP-11 assembly language without macro facilities. MACRO-11 is supported on all DEC PDP-11 operating systems. PDP-11 Unix systems also include an assembler (called "as"), structurally similar to MACRO-11, but with different syntax and fewer features.
As the first Unix text-formatting computer program, it is a predecessor of the nroff and troff document processing systems. [ 1 ] : 290 Roff was a Unix version of the runoff text-formatting program from Multics , which was a descendant of RUNOFF for CTSS (the first computerized text-formatting application).
For example, UNIX derivatives may pipeline commands connecting various processes' standard IO, using the pipes implemented by the operating system. Some operating systems [example needed] may provide UNIX-like syntax to string several program runs in a pipeline, but implement the latter as simple serial execution, rather than true pipelining ...
System calls and interrupts: High-level languages rarely have a direct facility to make arbitrary system calls, so assembly code is used. Direct interrupts are even more rarely supplied. To emit special directives for the linker or assembler, for example to change sectioning, macros, or to make symbol aliases.
The application program interfaces of IBM's mainframe operating systems is defined as a set of assembly language "macro" instructions, that typically invoke Supervisor Call (SVC) [e.g., on z/OS] or Diagnose (DIAG) [on, e.g., z/VM] instructions to invoke operating system routines. It is possible to use operating system services from programs ...
Some assemblers are components of a compiler system for a high-level programming language and may have limited or no usable functionality outside of the compiler system. Some assemblers are hosted on the target processor and operating system, while other assemblers (cross-assemblers) may run under an unrelated operating system or processor.
xv6 is a modern reimplementation of Sixth Edition Unix in ANSI C for multiprocessor x86 and RISC-V systems. It was created for educational purposes in MIT's Operating System Engineering course in 2006. [1]
The operating system is primarily targeted towards virtualized environments for cloud computing, or HPCs due to its design as a lightweight kernel (LWK). It could be used as a unikernel . It was inspired by another OS written in assembly, MikeOS, [ 2 ] and it is a recent example of an operating system that is not written in C or C++ , nor based ...