Listing 1

/* filename: example1.c */
void some_assembly_language()
{
  asm("
	bp0:
	  # housekeeping - stash flags 
	  # and eax for later restoration 
	  pushf
 	  pushl %eax
 	  
 	  pushf
	  # put copy of original flags in eax
 	  popl  %eax
	bp1:
 	  # flip all bits in that copy 
 	  xorl  $0xffffffff, %eax
	bp2:
 	  pushl %eax
	  # try to write flipped bit version into
	  # flags
 	  popf
 	  pushf
          # puts copy of new flag attempt into eax
 	  popl  %eax
        bp3:
        
          # housekeeping - restore 
          # original flags and eax */
          popl  %eax
          popf
          
	bp4:
      ");
}
        		  
void main()
{
  some_assembly_language();
  exit(0);