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A linker or link editor is a computer program that combines intermediate software build files such as object and library files into a single executable file such a program or library. A linker is often part of a toolchain that includes a compiler and/or assembler that generates intermediate files
The compiler may start the compiled code at an arbitrary location, often location 1 as shown. Location 13 contains the machine code for the jump instruction to statement ST in location 5. (C) If SUBR is later linked with other code it may be stored at a location other than 1. In this example the linker places it at location 120.
In computing, a dynamic linker is the part of an operating system that loads and links the shared libraries needed by an executable when it is executed (at "run time"), by copying the content of libraries from persistent storage to RAM, filling jump tables and relocating pointers. The specific operating system and executable format determine ...
1. The real mode compiler generates an instruction like this: CALL <segment>:<offset>-> 9A <offlow><offhigh><seglow><seghigh> with <seglow><seghigh> normally being defined as an address that must be fixed up at load time depending on the address where the code has been placed. […] 2. The Geos linker turns this into something else: INT 8xh ...
This differs from absolute code, [1] which must be loaded at a specific location to function correctly, [1] and load-time locatable (LTL) code, [1] in which a linker or program loader modifies a program before execution, so it can be run only from a particular memory location. [1]
In Unix, == the loader is the handler for the system call execve(). [1] The Unix loader's tasks include: validation (permissions, memory requirements etc.); memory-mapping the executable object from the disk into main memory; copying the command-line arguments into virtual memory; initializing registers (e.g., the stack pointer);
The first implemented compiler was written by Grace Hopper, who also coined the term "compiler", [6] [7] referring to her A-0 system which functioned as a loader or linker, not the modern notion of a compiler. The first Autocode and compiler in the modern sense were developed by Alick Glennie in 1952 at the University of Manchester for the Mark ...
In the GNU Compiler Collection (gcc), the entry point used by the linker is the _start symbol. Similarly, in the Portable Executable format, used in Microsoft Windows, the entry point is specified by the AddressOfEntryPoint field, which is inherited from COFF. In COM files, the entry point is at the fixed offset of 0100h.