Relocation (computing): Difference between revisions

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<ref name="Intel_iRMX">{{cite book |title=iRMX 86 Application Loader Reference Manual |publisher=[[Intel]] |url=http://bitsavers.informatik.uni-stuttgart.de/pdf/intel/iRMX/iRMX_86_Rev_6_Mar_1984/146196_Burst/iRMX_86_Application_Loader_Reference_Manual.pdf |access-date=2020-01-11 |url-status=live |archive-url=https://web.archive.org/web/20200111215002/http://bitsavers.informatik.uni-stuttgart.de/pdf/intel/iRMX/iRMX_86_Rev_6_Mar_1984/146196_Burst/iRMX_86_Application_Loader_Reference_Manual.pdf |archive-date=2020-01-11 |chapter=Types of Object Code |pages=((1{{hyphen}}2–1{{hyphen}}3)) |quote=[…] ''Absolute code'', and an absolute object module, is code that has been processed by LOC86 to run only at a specific ___location in memory. The [[Loader (computing)|Loader]] loads an absolute object module only into the specific ___location the module must occupy. ''[[Position-independent code]]'' (commonly referred to as PIC) differs from absolute code in that PIC can be loaded into any memory ___location. The advantage of PIC over absolute code is that PIC does not require you to reserve a specific block of memory. When the Loader loads PIC, it obtains [[iRMX&nbsp;86]] memory segments from the pool of the calling task's job and loads the PIC into the segments. A restriction concerning PIC is that, as in the [[PL/M-86]] COMPACT model of segmentation […], it can have only one code segment and one data segment, rather than letting the base addresses of these segments, and therefore the segments themselves, vary dynamically. This means that PIC programs are necessarily less than 64K bytes in length. PIC code can be produced by means of the BIND control of LINK86. ''Load-time locatable code'' (commonly referred to as LTL code) is the third form of object code. LTL code is similar to PIC in that LTL code can be loaded anywhere in memory. However, when loading LTL code, the Loader changes the base portion of pointers so that the pointers are independent of the initial contents of the registers in the microprocessor. Because of this fixup (adjustment of base addresses), LTL code can be used by tasks having more than one code segment or more than one data segment. This means that LTL programs may be more than 64K bytes in length. [[FORTRAN 86]] and [[Pascal 86]] automatically produce LTL code, even for short programs. LTL code can be produced by means of the BIND control of LINK86. […]}}</ref>

<ref name="Levine_1999_CH1_CH3">{{cite book |author-last=Levine |author-first=John R. |author-link=John R. Levine |title=Linkers and Loaders |date=2000 |orig-date=October 1999 |edition=1 |publisher=[[Morgan Kaufmann]] |series=The Morgan Kaufmann Series in Software Engineering and Programming |___location=San Francisco, California, USA |isbn=1-55860-496-0 |oclc=42413382 |chapter=Chapter 1: Linking and Loading & Chapter 3: Object Files |pages=5<!-- , --> |url=https://www.iecc.com/linker/ |access-date=2020-01-12 |url-status=live |archive-url=https://archive.today/20121205032107/http://www.iecc.com/linker/ |archive-date=2012-12-05}} Code: [https://archive.today/20200114225034/https://linker.iecc.com/code.html][ftp://ftp.iecc.com/pub/linker/]{{dead link|date=May 2025|bot=medic}}{{cbignore|bot=medic}} Errata: [https://linker.iecc.com/<!-- https://archive.today/20200114224817/https://linker.iecc.com/ 2020-01-14 -->]</ref>

<ref name="Borland_2007">{{cite web |author=Borland |author-link=Borland |title=Borland article #15961: Coping with 'Fixup Overflow' messages. |orig-date=1998-07-02 |date=1999-09-01 |series=Technical Information Database - Product: Borland C++ 3.1 |work=community.borland.com |id=TI961C.txt #15961 |url=http://vmlinux.org/~jakov/community.borland.com/15961.html |access-date=2007-01-15 |url-status=live |archive-url=https://web.archive.org/web/20080707030831/http://vmlinux.org/~jakov/community.borland.com/15961.html |archive-date=2008-07-07}}</ref>

<ref name="ELF">{{cite web |title=Executable and Linkable Format (ELF) |series=Tool Interface Standards (TIS) Portable Formats Specification, Version 1.1 |website=skyfree.org |url=http://www.skyfree.org/linux/references/ELF_Format.pdf |access-date=2018-10-01 |url-status=live |archive-url=https://web.archive.org/web/20191224125108/http://www.skyfree.org/linux/references/ELF_Format.pdf |archive-date=2019-12-24}}</ref>