140 lines
3.6 KiB
C
140 lines
3.6 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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* $FreeBSD$
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*/
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/*
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* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/* Copyright (c) 1988 AT&T */
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/* All Rights Reserved */
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#if defined(sun)
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#pragma ident "@(#)instr_size.c 1.14 05/07/08 SMI"
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#endif
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/proc.h>
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#if defined(sun)
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#include <sys/cmn_err.h>
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#include <sys/archsystm.h>
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#include <sys/copyops.h>
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#include <vm/seg_enum.h>
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#include <sys/privregs.h>
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#else
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typedef u_int model_t;
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#define DATAMODEL_NATIVE 0
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int dtrace_instr_size(uchar_t *);
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int dtrace_instr_size_isa(uchar_t *, model_t, int *);
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#endif
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#include <dis_tables.h>
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/*
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* This subsystem (with the minor exception of the instr_size() function) is
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* is called from DTrace probe context. This imposes several requirements on
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* the implementation:
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*
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* 1. External subsystems and functions may not be referenced. The one current
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* exception is for cmn_err, but only to signal the detection of table
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* errors. Assuming the tables are correct, no combination of input is to
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* trigger a cmn_err call.
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*
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* 2. These functions can't be allowed to be traced. To prevent this,
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* all functions in the probe path (everything except instr_size()) must
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* have names that begin with "dtrace_".
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*/
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typedef enum dis_isize {
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DIS_ISIZE_INSTR,
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DIS_ISIZE_OPERAND
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} dis_isize_t;
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/*
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* get a byte from instruction stream
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*/
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static int
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dtrace_dis_get_byte(void *p)
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{
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int ret;
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uchar_t **instr = p;
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ret = **instr;
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*instr += 1;
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return (ret);
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}
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/*
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* Returns either the size of a given instruction, in bytes, or the size of that
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* instruction's memory access (if any), depending on the value of `which'.
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* If a programming error in the tables is detected, the system will panic to
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* ease diagnosis. Invalid instructions will not be flagged. They will appear
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* to have an instruction size between 1 and the actual size, and will be
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* reported as having no memory impact.
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*/
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/* ARGSUSED2 */
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static int
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dtrace_dis_isize(uchar_t *instr, dis_isize_t which, model_t model, int *rmindex)
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{
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int sz;
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dis86_t x;
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uint_t mode = SIZE64;
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#if defined(sun)
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mode = (model == DATAMODEL_LP64) ? SIZE64 : SIZE32;
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#endif
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x.d86_data = (void **)&instr;
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x.d86_get_byte = dtrace_dis_get_byte;
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x.d86_check_func = NULL;
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if (dtrace_disx86(&x, mode) != 0)
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return (-1);
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if (which == DIS_ISIZE_INSTR)
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sz = x.d86_len; /* length of the instruction */
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else
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sz = x.d86_memsize; /* length of memory operand */
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if (rmindex != NULL)
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*rmindex = x.d86_rmindex;
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return (sz);
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}
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int
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dtrace_instr_size_isa(uchar_t *instr, model_t model, int *rmindex)
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{
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return (dtrace_dis_isize(instr, DIS_ISIZE_INSTR, model, rmindex));
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}
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int
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dtrace_instr_size(uchar_t *instr)
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{
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return (dtrace_dis_isize(instr, DIS_ISIZE_INSTR, DATAMODEL_NATIVE,
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NULL));
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}
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