I am new to assembly language programming. I write following code,
.text
.globl _start
_start:
movl $1,%eax
movl $0,%ebx
int $0x80
and use as -o JustExit.o JustExit.asm command for creating object file. (Assembly file name is JustExit.asm).
After this step I gave executable permission using,
chmod 777 ./JustExit.o
When I execute program it says,
-su: ./JustExit.o: cannot execute binary file
I am not able to understand why this simple 'exit' program is not working.
Thanks.
Assembling your source through as produces an object file which is "not yet" executable. You have to link the object file with a linker such as ld, which will then produce a fully working executable (a.out by default).
Your command line chain would look like this:
$ as -o JustExit.o JustExit.asm
$ ld JustExit.o
$ ./a.out
And it works!
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