static int emulate_popf(struct x86_emulate_ctxt *ctxt,
			void *dest, int len)
{
	int rc;
	unsigned long val, change_mask;
	int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> X86_EFLAGS_IOPL_BIT;
	int cpl = ctxt->ops->cpl(ctxt);

	rc = emulate_pop(ctxt, &val, len);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	change_mask = X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
		      X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF |
		      X86_EFLAGS_TF | X86_EFLAGS_DF | X86_EFLAGS_NT |
		      X86_EFLAGS_AC | X86_EFLAGS_ID;

	switch(ctxt->mode) {
	case X86EMUL_MODE_PROT64:
	case X86EMUL_MODE_PROT32:
	case X86EMUL_MODE_PROT16:
		if (cpl == 0)
			change_mask |= X86_EFLAGS_IOPL;
		if (cpl <= iopl)
			change_mask |= X86_EFLAGS_IF;
		break;
	case X86EMUL_MODE_VM86:
		if (iopl < 3)
			return emulate_gp(ctxt, 0);
		change_mask |= X86_EFLAGS_IF;
		break;
	default: /* real mode */
		change_mask |= (X86_EFLAGS_IOPL | X86_EFLAGS_IF);
		break;
	}

	*(unsigned long *)dest =
		(ctxt->eflags & ~change_mask) | (val & change_mask);

	return rc;
}
static int emulate_popf(struct x86_emulate_ctxt *ctxt,
			void *dest, int len)
{
	int rc;
	unsigned long val, change_mask;
	int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> X86_EFLAGS_IOPL_BIT;
	int cpl = ctxt->ops->cpl(ctxt);

	rc = emulate_pop(ctxt, &val, len);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	change_mask = X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
		      X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF |
		      X86_EFLAGS_TF | X86_EFLAGS_DF | X86_EFLAGS_NT |
		      X86_EFLAGS_AC | X86_EFLAGS_ID;

	switch(ctxt->mode) {
	case X86EMUL_MODE_PROT64:
	case X86EMUL_MODE_PROT32:
	case X86EMUL_MODE_PROT16:
		if (cpl == 0)
			change_mask |= X86_EFLAGS_IOPL;
		if (cpl <= iopl)
			change_mask |= X86_EFLAGS_IF;
		break;
	case X86EMUL_MODE_VM86:
		if (iopl < 3)
			return emulate_gp(ctxt, 0);
		change_mask |= X86_EFLAGS_IF;
		break;
	default:  
		change_mask |= (X86_EFLAGS_IOPL | X86_EFLAGS_IF);
		break;
	}

	*(unsigned long *)dest =
		(ctxt->eflags & ~change_mask) | (val & change_mask);

	return rc;
}