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 ?

Automata regular expresion, find nfa for L((aa*(a+b))

find nfa for L((aa*(a+b))

Find shortest path in network, Find shortest path from node 1 to node 10 in...

Find shortest path from node 1 to node 10 in the network shown in figure, also find shortest path from node 3 to node 10. Please write all steps to finding shortest path mechanism

Note on hyper text markup language (html) with example, Problem A) The ...

Problem A) The TCP/IP reference model is the network model used in the current Internet architecture. This model is derived from the OSI model and they are relatively same in n

Copmurer, Classify computer systems according to capacity. How they are dif...

Classify computer systems according to capacity. How they are different from computers according to the classification of technology. Provide comparative study also.

COMPUTER SYSTEM ARCHITECTURE, PLEASE HELP ME TO CONSTRUCT THE XOR GATE USIN...

PLEASE HELP ME TO CONSTRUCT THE XOR GATE USING ONLY NAND GATE

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

Compare between file processing system and dbms, Problem a. Compare bet...

Problem a. Compare between file processing system and DBMS >>This is a comparison of DBMS with file processing system which the answer has to be searched from the GOOGLE an

Standard Data Types, The data stored in memory can be of a lot of types. In...

The data stored in memory can be of a lot of types. In case, a person’s age is stored as a numeric value and his or her address is stored as alphanumeric characters. Python has som

Software design, Ineed help to do my homework which is for designing of req...

Ineed help to do my homework which is for designing of requirenments.

Exercise 2: Green cloud computing, Ask questioMost part of power consumptio...

Ask questioMost part of power consumption in data centers comes from computation processing, disk storage, network and cooling systems. Nowadays, there are new technologies and met

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