#include <stdio.h>
#include <stdlib.h>

void hello(void)
{
        puts("Hello!");
}

void goodbye(void)
{
        puts("Goodbye!");
}

void set_sp_(void *p)
{
        void *s[0];
        s[0] = p;
}

void set_sp(void *p)
{
        set_sp_((void*)p);
}

int main(void)
{
        void *new_stack[1024] = {
                [1019] = (void*)0,
                [1020] = (void*)&hello,
                [1021] = (void*)&goodbye,
                [1022] = (void*)&exit
        };
        set_sp((void*)&new_stack[1019]);
        return 0;
}