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Fix handling of null selectors.

This commit is contained in:
mycroft 1994-07-20 23:01:26 +00:00
parent 0898290d54
commit 6d61cde9dd
1 changed files with 11 additions and 11 deletions
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22
sys/arch/i386/i386/machdep.c
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
* $Id: machdep.c,v 1.111 1994/07/01 02:58:53 deraadt Exp $
* $Id: machdep.c,v 1.112 1994/07/20 23:01:26 mycroft Exp $
*/
#include <sys/param.h>
@ -532,20 +532,20 @@ check_selectors(u_short cs, u_short ss, u_short ds, u_short es)
andl %%edx,%%eax
movl %3,%%edx
verr %%dx
jz 2f
testl $0xfffc,%%edx
jnz 1f
2: andl %%edx,%%eax
movl %4,%%edx
verr %%dx
jz 2f
testl $0xfffc,%%edx
verr %%dx
jnz 1f
2: andl %%edx,%%eax
andl %%edx,%%eax
andl $3,%%eax
2: movl %4,%%edx
testl $0xfffc,%%edx
jz 2f
verr %%dx
jnz 1f
andl %%edx,%%eax
2: andl $3,%%eax
subl $3,%%eax
jmp 3f
1: movl $1,%%eax