/*
 * usage is easy, though not very friendly:
 * gcc reg-bug.c
 * ./a.out | od -tx4
 * <ENTER>
 * if the values outputted by hexdump are different the 'bug' is present
 * else the bug is not present
 * on a system without the bug:

dvorak$ dmesg | head -1
Linux version 2.2.21 (kernel@debian) (gcc version 2.95.4 20011002 (Debian prerelease)) #6 Sat Sep 7 22:48:42 CEST 2002
dvorak$ gcc reg-bug.c
dvorak$ ./a.out | od -tx4

0000000 bff7de6c bff7de6c
 
 * on a 'buggy' system:
 *

(m4xx) dmesg | head -1
(m4xx) Linux version 2.4.18 (maxx@meuuh) (gcc version 2.95.4 20011002 (Debian
+prerelease)) #2 Mon Jul 29 17:01:30 CEST 2002
(m4xx) $ gcc reg-bug.c
(m4xx) $ ./a.out | od -tx4
(m4xx) 0000000 bffffdcc bffffdbc

 */
int main(void)
{
    __asm__("
        pushl   $0x00010001 
        pushl   $0x0
        pushl   $0x00010001 
        pushl   $0x1
        movl    %esp, %ebx
        pushl   %ebx
        movl    $0x2, %ecx
        movl    $0xa8, %eax
        movl    $(-1), %edx
        int     $0x80
        pushl   %ebx
        movl    %esp, %ecx
        movl    $0x08, %edx
        movl    $0x04, %eax
        movl    $0x01, %ebx
        int     $0x80
        movl    $0x01, %eax
        xorl    %ebx, %ebx
        int     $0x80
   ");
}