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 mining, Process of Data mining Data mining is an iterative process t...

Process of Data mining Data mining is an iterative process that typically involves the following phases: Problem definition A data mining project starts with the understanding o

Explain different categories of electronic payment system, Problem 1 Ex...

Problem 1 Explain the different categories of electronic payment system in detail Listing the types and sub types Explanation Problem 2 We know that there a

#title., what is input and output device? explain meaning of input and outp...

what is input and output device? explain meaning of input and output devices

Reasons for recommendation free and open source software, For multi-nationa...

For multi-national business IT system, free and open source software (FOSS) is recommended over a proprietary system. The reasons for this recommendation are: 1. Security I

Describe the common modeling techniques in uml, Question 1 Explain with an...

Question 1 Explain with an example the three kinds of relationships that are most important in object oriented modeling Question 2 Describe the Common Modeling techniques in

Development of UNIX , Development of UNIX: The original UNIX developme...

Development of UNIX: The original UNIX development was performed on a Digital PDP-7 minicomputer and later moved to a PDP-11 minicomputer, the forerunner of the VAX computer.

Algorithm implementation, Implementing the -Crochemore-Perrin algorithm Th...

Implementing the -Crochemore-Perrin algorithm The software must be functional, code must be clear and including comments and it must have a nice and decent user interface

Cloud computing, report

report

Definition of Internal hardware interruptions, Internal interruptions are...

Internal interruptions are produced by convinced events which come during the execution of a program. These types of interruptions are handled on their totality by the hardware and

Working of a computer, Working of a Computer Computer may be div...

Working of a Computer Computer may be divided into the following units Input Unit Main Memory or Primary Storage Unit Arithmetic-Logic Unit

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