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/*
* 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 = SIZE32;
#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));
}
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