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 ?

Linux Calculator in Java, Hello, Could you create a linux calculator using ...

Hello, Could you create a linux calculator using very basic java code (not complex, because I am a novice java coder). It should be called into the terminal for interaction. Thank

Threading Module of python, The latest threading module comprised with Pyth...

The latest threading module comprised with Python 2.4 provides much more powerful, high-level hold for threads than the old thread module. The threading module depictions all the m

What do you mean by the term "robotics", Question 1 What do you mean by se...

Question 1 What do you mean by semantic networks? Explain inheritance in semantic networks Question 2 Explain Partitioned semantic networks with an example Question

What is a stateless and and a stateful server, StatefulServer, maintains so...

StatefulServer, maintains some information between requests. Requires smaller messages, since some information is kept between contacts, example: FTP, telnet. Stateless Server req

Synthesizer, assignment

assignment

Prelude to programming concepts and design 5th edition, Input a list of pos...

Input a list of positive numbers, terminated by 0, into an array numbers []. Then display the array and the largest and smallest number in it.

System software, Name and explain the classifications of computers

Name and explain the classifications of computers

ExtremeWhether.html, How to crete a web page name esp.html that allows user...

How to crete a web page name esp.html that allows users to conduct an ESP test

Audio/video applications on network, AUDIO/VIDEO APPLICATIONS ON NETWORK ...

AUDIO/VIDEO APPLICATIONS ON NETWORK Clinical applications of a computer include recording of slit lamp images on a computer. These still images or even videos can be recorde

Elements of cpu, ELEMENTS OF CPU: The CPU is a complex IC chip having ...

ELEMENTS OF CPU: The CPU is a complex IC chip having millions of transistors. As mentioned earlier, a CPU has three major identifiable parts: Control Unit (CU), Arithmetic & l

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