gistfile1.h

/* gcc -o nostdlib nostdlib.c -m32 -z execstack -nostdlib */
/* Who needs libc or asm() when you can abuse the ABI in horrible ways?*/
typedef int (*sc_fun)(int,int,int,int,int,int,int);

void _start(void) {
    char syscall[] = "\x60\x83\xc4\x24\x58\x5b\x59\x5a\x5e\x5f\x5d\xcd\x80\x83\xec\x40\x61\xc3";

    ((sc_fun)syscall)(4, 0, "Hello, World\n", 13, 0, 0, 0);
    ((sc_fun)syscall)(1, 0, 0, 0, 0, 0, 0);
}