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 ?

Power point microsoft, what are slides how do you put slides on powerpoint

what are slides how do you put slides on powerpoint

Explain digital multiplexers, Problem 1 Perform the following conversio...

Problem 1 Perform the following conversion a. (ABE) 16 =() 2 b. (101011) 2 =() 10 2 Explain how full adder adds three bits 3 Explain digital multiplexers

The elif Statement, The elif statement permits you to check multiple expres...

The elif statement permits you to check multiple expressions for truth value and execute a block of code the moment one of the conditions estimates to true. similar to the else, th

Python - Dictionary, A dictionary is variable and is one more container typ...

A dictionary is variable and is one more container type that can store any number of Python objects, counting other container types. Dictionaries consist of pairs (identified items

How to crack a password, how can i crack the password of vmware virtual mac...

how can i crack the password of vmware virtual machine

Quiz for your learning activity, The development of your learning module is...

The development of your learning module is very time consuming, so it is recommended that you begin creating your learning module during this first week. Before you begin, download

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

The skill of Assembly Language, The skill of Assembly Language Programming ...

The skill of Assembly Language Programming (AoA), Randy Hyde''s acclaimed text on assembly language programming, is the most-frequently recommended book on 80x86 assembly language

Distributed transaction management, 3. Discuss the objectives of Query Proc...

3. Discuss the objectives of Query Processing.

Simulated annealing-artificial intelligence, Simulated Annealing One wa...

Simulated Annealing One way to answer the problem of local maxima and related problems like ridges and plateaux in hill climbing is to permit the agent to go downhill to some e

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