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 ?

flow chart for online placement, Create systems flow chart and state trani...

Create systems flow chart and state tranistion diagram for online placement and consultancy

Data output, DATA OUTPUT : Whatever, data or information that you feed int...

DATA OUTPUT : Whatever, data or information that you feed into a computer will be the data output from a computer system and will be a data file sent from the computer to a periph

Printers, Printers: Printers: Printers exist in a variety of forms: ...

Printers: Printers: Printers exist in a variety of forms: Line Printers: These have been widely used for many years in large computer installations. They are design

Define CISC and RISC ?, Two competing architectures were developed for impr...

Two competing architectures were developed for improving the architecture of the central processing unit, and different processors are conventional to each one. Both had their powe

Software licensing, Software Licensing: Until early 1970's, sharing of...

Software Licensing: Until early 1970's, sharing of software was the accepted norm. Hardware came bundled with software products which could be freely redistributed and the acc

#, #queswhat computers can do tion..

#queswhat computers can do tion..

C, Padovan sequence

Padovan sequence

Data communication , (iv) Suppose that the TCP entity receives a 1.5 megaby...

(iv) Suppose that the TCP entity receives a 1.5 megabyte file from the application layer and that the IP layer is willing to carry blocks of maximum size 1500 bytes. Calculate the

Create a flowchart that displays the student''s avera, Ask questiCreate a f...

Ask questiCreate a flowchart that displays the student''s average score for three quizzes. + Assume that there are 3 sections each having 5 students + The only valid number to be

What is an abstract data type, QUESTION (a) What is an abstract data ty...

QUESTION (a) What is an abstract data type? (b) Give two limitations of the array implementation of lists. (c) Give the major disadvantage of the dynamic implementation o

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