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 ?

Management information systems, how to introduce information system an in o...

how to introduce information system an in organization

Decision table , No charges are reimbursed to the patient until the deducti...

No charges are reimbursed to the patient until the deductible has been met. Hospital visits are reimbursed at 80% and Lab visits are reimbursed at 70%. Doctor''s office visits are

Computer Memory, key characteristics of a DRAM

key characteristics of a DRAM

Mode of nutrition, what type of nutrition,leech is?

what type of nutrition,leech is?

Frequency and bandwidth, Frequency and Bandwidth: Let us try to unders...

Frequency and Bandwidth: Let us try to understand a little about how information is transmitted. The information may be in the form of sound (human voice, music) or it may be

10, constant key use for in calculator

constant key use for in calculator

Deadlocks, What is methods For handling Deadlocks?

What is methods For handling Deadlocks?

Explain the types of memory and explain how each work, Problem: a) ...

Problem: a) Explain the basic functions of a computer: inputting, processing, storing and outputting. b) List four types of memory and explain how each wor

C++, Write a C++ program that declares three integers and three strings. Th...

Write a C++ program that declares three integers and three strings. The program prompts the user for three characters and three integers and prints them all on one line.

Describe 3 components of a pattern, QUESTION (a) Compare the adapter pa...

QUESTION (a) Compare the adapter pattern with the façade and decorator patterns. (b) Illustrate a two-way adapter pattern. (c) Describe 3 components of a pattern. (d)

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