KernelInterface @ IA32

Geoffrey Lee glee at bluesat.unsw.edu.au
Wed Jun 16 17:38:49 CEST 2004


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";




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