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 ?

Cpu scheduler, Selects among the processes in memory which are ready to exe...

Selects among the processes in memory which are ready to execute & allocates the CPU to one of them CPU scheduling decisions can be taken place when a process: A. Terminates B. Swi

Depth first search-artificial intelligence, Depth First Search-Artificial i...

Depth First Search-Artificial intelligence: Depth first search is similar to breadth first, except that things are added to the top of the plan rather than the bottom. In our

Basic syntax of python language, The Python language has a lot of similarit...

The Python language has a lot of similarities to Perl, C and Java. Though, there are some specific differences between the languages. First Python Program: relative Mode Programmin

Operating system., assignments of bca 1st yaer

assignments of bca 1st yaer

Carrie Douglass Manager of the Broadway Book Shop, introduction

introduction

Software engineering, assignment 1:architectural design 2: component des...

assignment 1:architectural design 2: component design

Data structures, let me know if you can do this assignment and how long it ...

let me know if you can do this assignment and how long it takes

Hacking, how can i hack a server

how can i hack a server

Jsp project, how to save a Vector theList to a .txt file and read that .t...

how to save a Vector theList to a .txt file and read that .txt file to a jsp page /??

Tech ed, can you help me convert binary into decimals?

can you help me convert binary into decimals?

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