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What is a general loader scheme?
Loading schemes: 1.Absolute loader. 2.Relocating loader. 3.Direct linking loader. 4.Dynamic Loading. 5.Dynamic linking.(1 )Absolute loader: The task of an absolute loader is virtually trivial.The loader simply accepts machine language code and places it into main memory specified by the assembler.(2) Relocating loader: The task of relocating loader is to avoid reassembling of of all subroutines when a subroutine is changed and to perform tasks of allocation and linking for programmer.(3) Dynamic loading: In order to overlay structure to work it is necessary for the module loader to load the various procedures as they are needed.There are many binders capable of processing and allocating overlay structure.the portion of the laoder that actually intercepts calls and loads necessary procedure is called overlay supervisor of simplly flipper.this overall scheme is called dynamic loading or load on call.(4) Dynamic linking: This is mechanism by which loading and linking of external references are postponed until execution time.This was made to sort out disadvantage of previous loading schemes like subroutine is referenced and never executed
What are loaders and discuss various loading schemes with implementation of an absolute loader?
The loader is a program which accepts an object code and prepare them for execution.The loader's target language is machine language, its source language is nearly machine langugae.loading is ultimately bound with storage management function of operating systems and is usually performed later than assembly or compilation.the period of executions of user program is called execution time.the period of translating user's source program is called assembly or compile time. load time refers to the period of loading and preparing object program for execution. Loading schemes: 1.Absolute loader. 2.Relocating loader. 3.Direct linking loader. 4.Dynamic Loading. 5.Dynamic linking. Absolute loader: The task of an absolute loader is virtually trivial.The loader simply accepts machine language code and places it into main memory specified by the assembler. Relocating loader: The task of relocating loader is to avoid reassembling of of all subroutines when a subroutine is changed and to perform tasks of allocation and linking for programmer. Dynamic loading: In order to overlay structure to work it is necessary for the module loader to load the various procedures as they are needed.There are many binders capable of processing and allocating overlay structure.the portion of the laoder that actually intercepts calls and loads necessary procedure is called overlay supervisor of simplly flipper.this overall scheme is called dynamic loading or load on call. Dynamic linking: This is mechanism by which loading and linking of external references are postponed until execution time.This was made to sort out disadvantage of previous loading schemes like subroutine is referenced and never executed Implementation of Absolute loader: The four loader functions are performed as following: 1.Allocation- By programmer 2.Linking- By programmer 3.Relocation- By assembler 4.Loading- By loader
What are the diff between linking loader and linkage editor?
linkage editor produce a linked version of program (load module or executable image ) is later on loaded into the memory for later execution. linking loader first perform linking,relocation of programs,automatic library search at load time. linkage editor have good flexibility and control than linking loader. Linking loader performs the linking and relocation at load time and linkage editor done prior to the load time
What is the difference between wheel loader and front end loader?
Difference between Front End Loader and Wheel Loader
Differentiate between relocatable and self relocatable programs?
relocatable code is code where final output of the assembly phase,ready to be used an input to loader. self relocatable is the code where output of the code is ready to use any point
