16 Jun
2004
16 Jun
'04
5:38 p.m.
On Wed, Jun 16, 2004 at 11:05:41PM +0800, Louis wrote:
Hi L4 hackers, I'm a newbie in L4 and reading L4 X.2 spec. In IA32 interface, KernelInterface is implemented by 'lock: nop'. That really confuses me. Is it not just a placeholder? Any special side-effect? I can not find any clue in IA32 manuals.
lock nop is not a valid instruction. Doing it will cause a trap (and that is how you get the interface page).
So it is not a placeholder.
- g.
--
char p[] = "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
"\x80\xe8\xdc\xff\xff\xff/bin/sh";