// gcc box86_test.c -o box86_test
#include <stdio.h>

__attribute__((naked)) int foo()
{
  __asm(
    "movl $0xFFFFFFFF, %eax\n\t"
    "addl $1, %eax\n\t"
    "incl %eax\n\t"
    "pushf\n\t"
    "pop  %eax\n\t"
    "ret\n\n"
    );
}

int main()
{
  printf("eflags: 0x%08x\n", foo());
  return 0;
}