2012/7/15 Mulyadi Santosa <[email protected]>
> Hi...
>
> On Sun, Jul 15, 2012 at 9:28 AM, 王哲 <[email protected]> wrote:
> > and the second program:
> >
> > #include <stdio.h>
> > #include <unistd.h>
> >
> > int main(void)
> > {
> > unsigned long value = 0;
> > value = getpid();
> > return 0;
> > }
> >
> > and disassembling it:( objdump -d a.out)
> > ...
> > 08048300 <getpid@plt>:
> > 8048300: ff 25 00 a0 04 08 jmp *0x804a000
> > 8048306: 68 00 00 00 00 push $0x0
> > 804830b: e9 e0 ff ff ff jmp 80482f0 <_init+0x3c>
>
> Looks like jumping into vsyscall page to me...
>
thanks for reply.
and i wander why the address of vsyscall page is not 0xffffe000 in my
system?
...
b7806000-b7807000 r-xp 00000000 00:00 0 [vdso]
b7807000-b7827000 r-xp 00000000 08:08 2491275 /lib/i386-linux-gnu/
ld-2.15.so
b7827000-b7828000 r--p 0001f000 08:08 2491275 /lib/i386-linux-gnu/
ld-2.15.so
b7828000-b7829000 rw-p 00020000 08:08 2491275 /lib/i386-linux-gnu/
ld-2.15.so
...
root@glinuxi-G31M-ES2C:~# ldd /bin/ls
linux-gate.so.1 => (0xb786b000)
libselinux.so.1 => /lib/i386-linux-gnu/libselinux.so.1 (0xb7839000)
librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0xb7830000)
libacl.so.1 => /lib/i386-linux-gnu/libacl.so.1 (0xb7826000)
...
>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
>
_______________________________________________
Kernelnewbies mailing list
[email protected]
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
