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segment .data

segment .bss

segment .text
	global happy
happy:
	push ebp
	mov ebp, esp
	
	mov eax, 5

	pop ebp
	ret

Code: Select all

#include <stdio.h>

extern long happy();

int main(){
	printf("I got: %d\n", happy());

	return 0;
}

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nasm test.asm -o test.o -f elf32
gcc -m32 main.c test.o -o experiment

Code: Select all

segment .data

segment .bss

segment .text

	extern global_var
	global happy
happy:
	push ebp
	mov ebp, esp
	
	mov eax, 5
	add eax, [global_var]

	pop ebp
	ret

Code: Select all

#include <stdio.h>

extern long happy();

int global_var = 3;

int main(){
	printf("I got: %d\n", happy());

	return 0;
}