Segmentation fault(core dumped)

[huseyinyagli]

Program is running normally do the job but is killed at the end and I get this error message

a very simple example:

---asm.s
global OpenFile

section .text

OpenFile:
push ebp
mov ebp,esp

mov eax,5
mov ebx,[ebp+8]
mov ecx,0
int 80h

leave
ret

--------main.c
extern int OpenFile(const char *);


int main(int argc,char *argv[]){
int result = 0;
if(argc > 1)
result = OpenFile(argv[1]);

printf("%d\n",result);
return 1;
}

----makefile
try : main.o asm.o
gcc -o try main.o asm.o
main.o : main.c
gcc -c main.c
asm.o : asm.s
nasm -f elf asm.s

 

[AmkG]

Presumably, your OS is not DOS.

What part crashed?

Incidentally, the ENTER and LEAVE instructions are considered obsolete...
"Information has a tendency to be free. Which means someone will always tell you something you don't want to know."

 

[huseyinyagli]

I've found my problem, its that I dont push-pop the registers that I'm modifying in the function...

 

[AmkG]

No, that's not it. LEAVE pops off ebp from the stack. Better yet, forget about using LEAVE and ENTER, they're considered obsolete and downright dangerous. "Information has a tendency to be free. Which means someone will always tell you something you don't want to know."