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 ?

Cache memory, Cache memory: To reduce the idle time of the CPU and inc...

Cache memory: To reduce the idle time of the CPU and increase the speed of processing, a fast memory can be used. This can be done by using a large size of main memory. But th

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

Process killed, 1. What actions need to be taken when a program terminates ...

1. What actions need to be taken when a program terminates or a process is killed? What if that process destruction is not the consequence of normal termination, but rather is the

Perverse software, Perverse software: Perverse software is a program w...

Perverse software: Perverse software is a program which causes hindrances in other programs execution in such a way resulting in modification or complete destruction of data w

Cg, function of electrostatic plotter

function of electrostatic plotter

Networking.., write advantages and disadvantages of private and public netw...

write advantages and disadvantages of private and public network

Stack, How to write an algorithm to reverse the order of elements on a stac...

How to write an algorithm to reverse the order of elements on a stack s using two additional stacks

What is the delay of the filter, QUESTION We wish to use the Kaiser win...

QUESTION We wish to use the Kaiser window method to design a discrete-time filter with generalized linear phase that meets specifications of the following form:

Write Your Message!

Captcha
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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd