1 files changed, 121 insertions, 0 deletions
diff --git a/usr/src/uts/common/brand/lx/syscall/lx_modify_ldt.c b/usr/src/uts/common/brand/lx/syscall/lx_modify_ldt.c
new file mode 100644
index 0000000000..aa6e12a7d8
--- /dev/null
+++ b/usr/src/uts/common/brand/lx/syscall/lx_modify_ldt.c
@@ -0,0 +1,121 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/types.h>
+#include <sys/systm.h>
+#include <sys/errno.h>
+#include <sys/segments.h>
+#include <sys/archsystm.h>
+#include <sys/proc.h>
+#include <sys/sysi86.h>
+#include <sys/cmn_err.h>
+#include <sys/lx_ldt.h>
+
+/*
+ * Read the ldt_info structure in from the Linux app, convert it to an ssd
+ * structure, and then call setdscr() to do all the heavy lifting.
+ */
+static int
+write_ldt(void *data, ulong_t count)
+{
+	user_desc_t usd;
+	struct ssd ssd;
+	struct ldt_info ldt_inf;
+	proc_t *pp = curthread->t_procp;
+	int err;
+
+	if (count != sizeof (ldt_inf))
+		return (set_errno(EINVAL));
+
+	if (copyin(data, &ldt_inf, sizeof (ldt_inf)))
+		return (set_errno(EFAULT));
+
+	if (ldt_inf.entry_number >= MAXNLDT)
+		return (set_errno(EINVAL));
+
+	LDT_INFO_TO_DESC(&ldt_inf, &usd);
+	usd_to_ssd(&usd, &ssd, SEL_LDT(ldt_inf.entry_number));
+
+	/*
+	 * Get everyone into a safe state before changing the LDT.
+	 */
+	if (!holdlwps(SHOLDFORK1))
+		return (set_errno(EINTR));
+
+	err = setdscr(&ssd);
+
+	/*
+	 * Release the hounds!
+	 */
+	mutex_enter(&pp->p_lock);
+	continuelwps(pp);
+	mutex_exit(&pp->p_lock);
+
+	return (err ? set_errno(err) : 0);
+}
+
+static int
+read_ldt(void *uptr, ulong_t count)
+{
+	proc_t *pp = curproc;
+	int bytes;
+
+	if (pp->p_ldt == NULL)
+		return (0);
+
+	bytes = (pp->p_ldtlimit + 1) * sizeof (user_desc_t);
+	if (bytes > count)
+		bytes = count;
+
+	if (copyout(pp->p_ldt, uptr, bytes))
+		return (set_errno(EFAULT));
+
+	return (bytes);
+}
+
+long
+lx_modify_ldt(int op, void *data, ulong_t count)
+{
+	int rval;
+
+	switch (op) {
+	case 0:
+		rval = read_ldt(data, count);
+		break;
+
+	case 1:
+		rval = write_ldt(data, count);
+		break;
+
+	default:
+		rval = set_errno(ENOSYS);
+		break;
+	}
+
+	return (rval);
+}