When does a general protection fault occur?

When does a general protection fault occur?

[Kim, Hyunchul]

Hi all,
 
I'm studying non-executable stack patch.
It modified do_general_protection(), the general protection fault
handler(?).
I wanna know when the handler is called, or where could I find it.
 
Thanks in advance.
 

Re: When does a general protection fault occur?

[Randy.Dunlap]

On Wed, 17 Sep 2003 15:54:20 +0900 "Kim, Hyunchul" <kimhc@inzen.com> wrote:

| 
| Hi all,
|  
| I'm studying non-executable stack patch.
| It modified do_general_protection(), the general protection fault
| handler(?).
| I wanna know when the handler is called, or where could I find it.

See Intel or AMD developer manuals for GP faults/exceptions.

You can use something like this to find do_general_protection:

$ find . -name \*\.[hcS] | xargs grep -n do_general_protection

and learn that it is in (this is from 2.6.0-test4):

./arch/i386/kernel/traps.c:420:asmlinkage void do_general_protection(struct pt_regs * regs, long error_code)
and
./arch/x86_64/kernel/traps.c:456:asmlinkage void do_general_protection(struct pt_regs * regs, long error_code)

--
~Randy