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The program had to explicitly call the CHAIN subroutine to load a new link, and the new link replaced all of the old link's storage except for the Fortran COMMON area. IBM introduced more general overlay handling [ 7 ] in IBSYS / IBJOB , including a tree structure and automatic loading of links as part of CALL processing.
The system's Linkage Editor application is named IEWL. [3] IEWL's main function is to associate load modules (executable programs) and object modules (the output from, say, assemblers and compilers), including "automatic calls" to libraries (high-level language "built-in functions"), into a format which may be most efficiently loaded by IEWFETCH.
On Unix and Unix-like systems, the static linker is usually invoked via the command ld which is an abbreviation of LoaDer or Link eDitor. The term "loader" was used to describe the process of loading external symbols from other programs during the process of linking. [4] For example, on SINTRAN III, linking (assembling object files into a ...
IBM also announced [2] MVS/Extended Architecture (MVS/XA), consisting of MVS/SP Version 2 [3] and a corequisite new product, Data Facility Product [4] (DFP), 5665-284, replacing [b] five of the products listed above, the linkage editor and the loader.
Linking is often referred to as a process that is performed when the executable is compiled, while a dynamic linker is a special part of an operating system that loads external shared libraries into a running process and then binds those shared libraries dynamically to the running process. This approach is also called dynamic linking or late ...
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An example of load-and-go systems is the loader Anthony J. Barr wrote for the University Computing Corporation in 1968 that was replaced in the market by the IBM OS/360 loader in 1972. These OS/360 loaders performed many of the functions of the Linkage Editor but placed the linked program in memory rather than creating an executable on disk. [9]
Relocation is the process of assigning load addresses for position-dependent code and data of a program and adjusting the code and data to reflect the assigned addresses. [1] [2] Prior to the advent of multiprocess systems, and still in many embedded systems, the addresses for objects are absolute starting at a known location, often zero.