1 files changed, 132 insertions, 0 deletions
diff --git a/sys/cddl/dev/dtrace/amd64/instr_size.c b/sys/cddl/dev/dtrace/amd64/instr_size.c
new file mode 100644
index 000000000000..418d9f1fb53b
--- /dev/null
+++ b/sys/cddl/dev/dtrace/amd64/instr_size.c
@@ -0,0 +1,132 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (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
+ *
+ * $FreeBSD$
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*	Copyright (c) 1988 AT&T	*/
+/*	  All Rights Reserved	*/
+
+
+#if defined(sun)
+#pragma ident	"@(#)instr_size.c	1.14	05/07/08 SMI"
+#endif
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/proc.h>
+#if defined(sun)
+#include <sys/cmn_err.h>
+#include <sys/archsystm.h>
+#include <sys/copyops.h>
+#include <vm/seg_enum.h>
+#include <sys/privregs.h>
+#else
+typedef	u_int			model_t;
+#define	DATAMODEL_NATIVE	0
+int dtrace_instr_size(uchar_t *);
+#endif
+
+#include <dis_tables.h>
+
+/*
+ * This subsystem (with the minor exception of the instr_size() function) is
+ * is called from DTrace probe context.  This imposes several requirements on
+ * the implementation:
+ *
+ * 1. External subsystems and functions may not be referenced.  The one current
+ *    exception is for cmn_err, but only to signal the detection of table
+ *    errors.  Assuming the tables are correct, no combination of input is to
+ *    trigger a cmn_err call.
+ *
+ * 2. These functions can't be allowed to be traced.  To prevent this,
+ *    all functions in the probe path (everything except instr_size()) must
+ *    have names that begin with "dtrace_".
+ */
+
+typedef enum dis_isize {
+	DIS_ISIZE_INSTR,
+	DIS_ISIZE_OPERAND
+} dis_isize_t;
+
+
+/*
+ * get a byte from instruction stream
+ */
+static int
+dtrace_dis_get_byte(void *p)
+{
+	int ret;
+	uchar_t **instr = p;
+
+	ret = **instr;
+	*instr += 1;
+
+	return (ret);
+}
+
+/*
+ * Returns either the size of a given instruction, in bytes, or the size of that
+ * instruction's memory access (if any), depending on the value of `which'.
+ * If a programming error in the tables is detected, the system will panic to
+ * ease diagnosis.  Invalid instructions will not be flagged.  They will appear
+ * to have an instruction size between 1 and the actual size, and will be
+ * reported as having no memory impact.
+ */
+/* ARGSUSED2 */
+static int
+dtrace_dis_isize(uchar_t *instr, dis_isize_t which, model_t model, int *rmindex)
+{
+	int sz;
+	dis86_t	x;
+	uint_t mode = SIZE64;
+
+#if defined(sun)
+	mode = (model == DATAMODEL_LP64) ? SIZE64 : SIZE32;
+#endif
+
+	x.d86_data = (void **)&instr;
+	x.d86_get_byte = dtrace_dis_get_byte;
+	x.d86_check_func = NULL;
+
+	if (dtrace_disx86(&x, mode) != 0)
+		return (-1);
+
+	if (which == DIS_ISIZE_INSTR)
+		sz = x.d86_len;		/* length of the instruction */
+	else
+		sz = x.d86_memsize;	/* length of memory operand */
+
+	if (rmindex != NULL)
+		*rmindex = x.d86_rmindex;
+	return (sz);
+}
+
+int
+dtrace_instr_size(uchar_t *instr)
+{
+	return (dtrace_dis_isize(instr, DIS_ISIZE_INSTR, DATAMODEL_NATIVE,
+	    NULL));
+}