What is code segment, Computer Engineering

Assignment Help:

Q. What is CODE SEGMENT?

The logical program segment is termed as code segment. When linker links a program it makes a note in header section of program's executable file defining the location of code segment when DOS invokes the loader to load an executable file in memory then loader reads that note.  As it loads the program in memory loader also makes notes to itself of exactly where in memory it essentially places every one of the program's other logical segments.  As loader hands execution over to program it has just loaded it sets CS register to address the base of segment identified by linker as code segment. This reduces each instruction in code segment addressable in segment relative terms in form CS: xxxx. 

Linker also presumes by default that first instruction in code segment is aimed to be first instruction to be executed.  That instruction shall appear in memory at an offset of 0000H from base of code segment so linker passes that value on to loader by leaving an another note in header of program's executable file. Loader sets IP (Instruction Pointer) register to that value.  This sets CS:IP to segment relative address of first instruction in program.


Related Discussions:- What is code segment

Define mfc, Define MFC. To accommodate the variability in response time...

Define MFC. To accommodate the variability in response time, the processor waits unless it receives an indication that the requested read operation has been done. The control s

What are parallel algorithms, What are Parallel Algorithms? The central...

What are Parallel Algorithms? The central assumption of the RAM model does not hold for some newer computers that can implement operations concurrently, i.e., in parallel algor

What do you mean by parallel virtual machine, Q.What do you mean by Paralle...

Q.What do you mean by Parallel virtual machine? PVM is essentially a simulation of a computer machine running parallel programs. It is a software package which allows a heterog

Explain about the postpurchase interaction briefly, Explain about the postp...

Explain about the postpurchase interaction briefly. Postpurchase Interaction: Customer support and service: The considerations at such can be explained by the followin

Explain about truth table and logic diagram, Q. Explain about truth table a...

Q. Explain about truth table and logic diagram? A Boolean function can be realized in a logic circuit employing the basic gates: - AND, OR & NOT. Concern here for illustration

Full form of ldap, LDAP stands for LDAP- Light weight Directory Access...

LDAP stands for LDAP- Light weight Directory Access Protocol.

Linux, Discuss the risks of having a single root user and how more limited ...

Discuss the risks of having a single root user and how more limited management abilities can be given to others users on Linux/UNIX systems

Unification algorithm, Unification Algorithm: Here if notice for insta...

Unification Algorithm: Here if notice for instance that to unify two sentences as we must find a substitution that makes the two sentences the same. Furthermore remember there

No class can derive, Make a console application. Add class 'Account' having...

Make a console application. Add class 'Account' having variables as num (integer) name (String), bal (double), ac_code (byte). Describe four different constructors to initialize th

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd