NVidia glx stuff dies in sysarch(I386_SET_LDT, ...)
David Xu
davidxu at FreeBSD.org
Fri Aug 1 15:44:15 PDT 2003
On Saturday 02 August 2003 06:24, Munish Chopra wrote:
> On 2003-08-02 00:20 +0200, Thorsten Greiner wrote:
> > * Daniel Eischen <eischen at vigrid.com> [2003-08-02 00:06]:
> > > I think the bug was in the old code allowing this to
> > > happen...
> >
> > Well, than someone should tell that to NVidia. Their driver is
> > closed source and comes without "user servicable parts".
> >
> > Regards
> > -Thorsten
>
> That's going to be a lot easier to get through if someone can confirm
> whether 0-16 are reserved, or whether (like julian says), 6-15 are
> actually safe and something else is being clobbered.
#define LSYS5CALLS_SEL 0 /* forced by intel BCS */
#define LSYS5SIGR_SEL 1
#define L43BSDCALLS_SEL 2 /* notyet */
#define LUCODE_SEL 3
#define LSOL26CALLS_SEL 4 /* Solaris >= 2.6 system call gate */
#define LUDATA_SEL 5
/* separate stack, es,fs,gs sels ? */
/* #define LPOSIXCALLS_SEL 5*/ /* notyet */
#define LBSDICALLS_SEL 16 /* BSDI system call gate */
#define NLDT (LBSDICALLS_SEL + 1)
LUCODE_SEL is used by kernel to load _ucodesel to user %cs
LUDATA_SEL is used by kernel to load _udatasel to user %ds, %es, %fs, %gs.
I didn't check other ABIs, but setting to a fixed location of LDT in userland
is also a bad idea, I think it will conflict with thread library soon,
it is better to use dynamic allocating facility newly added in i386_set_ldt.
David Xu
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