learn,how to mix C and Assembly Language ?, Basic Computer Science

learn,how to mix C and Assembly Language ?, Basic Computer Science

Assignment Help:

The technique to mix C and assembly language is to apply the "asm" directive. To access C-language variables from assembly language, you just use the C identifier that name is a memory operand. These variables cannot be local to a procedure, and also cannot be static within a procedure. They have to be global (but can be static global). The newline characters are essential.
unsigned long a1, r;
void junk( void )
{
asm(
"pushl %eax \n"
"pushl %ebx \n"
"movl $100,%eax \n"
"movl a1,%ebx \n"
"int $59 \n"
"movl %eax,r \n"
"popl %ebx \n"
"popl %eax \n"
);
}

This instance does the following:
1. Pushes the value stored in %eax and %ebx onto the stack.
2. Puts a value of 100 into %eax.
3. Copies the value in global variable a1 into %ebx.
4. Executes a software interrupt number 59.
5. Copies the value in %eax into the global variable r.
6. Restores (pops) the contents of the temporary registers %eax and %ebx.

Related Discussions:- learn,how to mix C and Assembly Language ?

Data Type Conversion, Sometimes you may drop to perform conversions among t...

Sometimes you may drop to perform conversions among the built-in types. To translate between types you just use the type name as a function. There are quite a few built-in function

What is thread in operating system?, Regardless of of the fact that a thre...

Regardless of of the fact that a thread must execute in process, the process and its associated threads are different notion. Processes are used to group resources together and thr

Dbms, Explain displaying an er schema as an er diagram, Database Management...

Explain displaying an er schema as an er diagram, Database Management System

ICT, what are the significance of telecommunications deregulation

what are the significance of telecommunications deregulation

Hangman, Aim This assignment is intended to assess your skills in understan...

Aim This assignment is intended to assess your skills in understanding and interpreting a moderately complex problem, designing a solution to the problem and implementing the desig

Magnetic memory, Magnetic Memory: In the above section we have seen v...

Magnetic Memory: In the above section we have seen various types of semiconductor RAMs. These high speed semiconductor storage devices (i.e. RAMs) are expensive. So we need s

Word processing software, Word Processing Software : The main use for word...

Word Processing Software : The main use for word processing is found in secretarial offices and small publishing companies. However, if you are involved in generating your own cor

Functions, difference between recursion and iteration

difference between recursion and iteration

Software design, Ineed help to do my homework which is for designing of req...

Ineed help to do my homework which is for designing of requirenments.

Memory, why do computer have internal memory as a part of cpu and the inter...

why do computer have internal memory as a part of cpu and the internal bulk memory seprately?

Write Your Message!

Name

Email id

Message

Verfication Code

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!

Submit Assignment

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