1179237Sjb/* 2179237Sjb * CDDL HEADER START 3179237Sjb * 4179237Sjb * The contents of this file are subject to the terms of the 5179237Sjb * Common Development and Distribution License, Version 1.0 only 6179237Sjb * (the "License"). You may not use this file except in compliance 7179237Sjb * with the License. 8179237Sjb * 9179237Sjb * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10179237Sjb * or http://www.opensolaris.org/os/licensing. 11179237Sjb * See the License for the specific language governing permissions 12179237Sjb * and limitations under the License. 13179237Sjb * 14179237Sjb * When distributing Covered Code, include this CDDL HEADER in each 15179237Sjb * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16179237Sjb * If applicable, add the following below this CDDL HEADER, with the 17179237Sjb * fields enclosed by brackets "[]" replaced with your own identifying 18179237Sjb * information: Portions Copyright [yyyy] [name of copyright owner] 19179237Sjb * 20179237Sjb * CDDL HEADER END 21179237Sjb * 22179237Sjb * $FreeBSD$ 23179237Sjb */ 24179237Sjb/* 25179237Sjb * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 26179237Sjb * Use is subject to license terms. 27179237Sjb */ 28179237Sjb 29179237Sjb/* Copyright (c) 1988 AT&T */ 30179237Sjb/* All Rights Reserved */ 31179237Sjb 32179237Sjb 33179237Sjb#if defined(sun) 34179237Sjb#pragma ident "@(#)instr_size.c 1.14 05/07/08 SMI" 35179237Sjb#endif 36179237Sjb 37179237Sjb#include <sys/types.h> 38179237Sjb#include <sys/param.h> 39179237Sjb#include <sys/proc.h> 40179237Sjb#if defined(sun) 41179237Sjb#include <sys/cmn_err.h> 42179237Sjb#include <sys/archsystm.h> 43179237Sjb#include <sys/copyops.h> 44179237Sjb#include <vm/seg_enum.h> 45179237Sjb#include <sys/privregs.h> 46179237Sjb#else 47179237Sjbtypedef u_int model_t; 48179237Sjb#define DATAMODEL_NATIVE 0 49179237Sjbint dtrace_instr_size(uchar_t *); 50211607Srpauloint dtrace_instr_size_isa(uchar_t *, model_t, int *); 51179237Sjb#endif 52179237Sjb 53179237Sjb#include <dis_tables.h> 54179237Sjb 55179237Sjb/* 56179237Sjb * This subsystem (with the minor exception of the instr_size() function) is 57179237Sjb * is called from DTrace probe context. This imposes several requirements on 58179237Sjb * the implementation: 59179237Sjb * 60179237Sjb * 1. External subsystems and functions may not be referenced. The one current 61179237Sjb * exception is for cmn_err, but only to signal the detection of table 62179237Sjb * errors. Assuming the tables are correct, no combination of input is to 63179237Sjb * trigger a cmn_err call. 64179237Sjb * 65179237Sjb * 2. These functions can't be allowed to be traced. To prevent this, 66179237Sjb * all functions in the probe path (everything except instr_size()) must 67179237Sjb * have names that begin with "dtrace_". 68179237Sjb */ 69179237Sjb 70179237Sjbtypedef enum dis_isize { 71179237Sjb DIS_ISIZE_INSTR, 72179237Sjb DIS_ISIZE_OPERAND 73179237Sjb} dis_isize_t; 74179237Sjb 75179237Sjb 76179237Sjb/* 77179237Sjb * get a byte from instruction stream 78179237Sjb */ 79179237Sjbstatic int 80179237Sjbdtrace_dis_get_byte(void *p) 81179237Sjb{ 82179237Sjb int ret; 83179237Sjb uchar_t **instr = p; 84179237Sjb 85179237Sjb ret = **instr; 86179237Sjb *instr += 1; 87179237Sjb 88179237Sjb return (ret); 89179237Sjb} 90179237Sjb 91179237Sjb/* 92179237Sjb * Returns either the size of a given instruction, in bytes, or the size of that 93179237Sjb * instruction's memory access (if any), depending on the value of `which'. 94179237Sjb * If a programming error in the tables is detected, the system will panic to 95179237Sjb * ease diagnosis. Invalid instructions will not be flagged. They will appear 96179237Sjb * to have an instruction size between 1 and the actual size, and will be 97179237Sjb * reported as having no memory impact. 98179237Sjb */ 99179237Sjb/* ARGSUSED2 */ 100179237Sjbstatic int 101179237Sjbdtrace_dis_isize(uchar_t *instr, dis_isize_t which, model_t model, int *rmindex) 102179237Sjb{ 103179237Sjb int sz; 104179237Sjb dis86_t x; 105179237Sjb uint_t mode = SIZE64; 106179237Sjb 107179237Sjb#if defined(sun) 108179237Sjb mode = (model == DATAMODEL_LP64) ? SIZE64 : SIZE32; 109179237Sjb#endif 110179237Sjb 111179237Sjb x.d86_data = (void **)&instr; 112179237Sjb x.d86_get_byte = dtrace_dis_get_byte; 113179237Sjb x.d86_check_func = NULL; 114179237Sjb 115179237Sjb if (dtrace_disx86(&x, mode) != 0) 116179237Sjb return (-1); 117179237Sjb 118179237Sjb if (which == DIS_ISIZE_INSTR) 119179237Sjb sz = x.d86_len; /* length of the instruction */ 120179237Sjb else 121179237Sjb sz = x.d86_memsize; /* length of memory operand */ 122179237Sjb 123179237Sjb if (rmindex != NULL) 124179237Sjb *rmindex = x.d86_rmindex; 125179237Sjb return (sz); 126179237Sjb} 127179237Sjb 128179237Sjbint 129211607Srpaulodtrace_instr_size_isa(uchar_t *instr, model_t model, int *rmindex) 130211607Srpaulo{ 131211607Srpaulo return (dtrace_dis_isize(instr, DIS_ISIZE_INSTR, model, rmindex)); 132211607Srpaulo} 133211607Srpaulo 134211607Srpauloint 135179237Sjbdtrace_instr_size(uchar_t *instr) 136179237Sjb{ 137179237Sjb return (dtrace_dis_isize(instr, DIS_ISIZE_INSTR, DATAMODEL_NATIVE, 138179237Sjb NULL)); 139179237Sjb} 140