On 07/28/2010 11:38 AM, Mohammed Gamal wrote:
+ unsigned long mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF |
EFLG_TF |
+ EFLG_IF | EFLG_DF | EFLG_OF | EFLG_IOPL | EFLG_NT
| EFLG_RF |
+ EFLG_AC | EFLG_ID | (1 << 1); /* Last one is the
reserved bit */
+ unsigned long vm86_mask = EFLG_VM | EFLG_VIF | EFLG_VIP;
...
+ if (c->op_bytes == 4)
+ ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags &
vm86_mask));
+ else if (c->op_bytes == 2) {
+ ctxt->eflags &= ~0xffff;
+ ctxt->eflags |= temp_eflags;
+ }
I think that's still not it. You can set reserved bits for c->op_bytes
== 2, and you can clear bit 1 for both 16- and 32-bit IRET.
IOW you need something like this:
mask = ...; /* without (1 << 1); */
ctxt_mask = (1 << 1) | EFLG_VM | EFLG_VIF | EFLG_VIP;
if (c->op_bytes == 2) {
mask &= 0xffff;
ctxt_mask |= ~0xffff;
}
ctxt->eflags = (temp_eflags & mask) | (ctxt->eflags & ctxt_mask);
Paolo
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