/* * 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 */ /* * Copyright 2005 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1988 AT&T */ /* All Rights Reserved */ /* * #pragma ident "@(#)instr_size.c 1.14 05/07/08 SMI" */ #include <sys/dtrace.h> #include <sys/dtrace_glue.h> #include <sys/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; mode = (model == DATAMODEL_LP64) ? SIZE64 : SIZE32; 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_isa(uchar_t *instr, model_t model, int *rmindex) { return (dtrace_dis_isize(instr, DIS_ISIZE_INSTR, model, rmindex)); } int dtrace_instr_size(uchar_t *instr) { return (dtrace_dis_isize(instr, DIS_ISIZE_INSTR, DATAMODEL_NATIVE, NULL)); } #if !defined(__APPLE__) /*ARGSUSED*/ int instr_size(struct regs *rp, caddr_t *addrp, enum seg_rw rw) { uchar_t instr[16]; /* maximum size instruction */ caddr_t pc = (caddr_t)rp->r_pc; (void) copyin_nowatch(pc, (caddr_t)instr, sizeof (instr)); return (dtrace_dis_isize(instr, rw == S_EXEC ? DIS_ISIZE_INSTR : DIS_ISIZE_OPERAND, curproc->p_model, NULL)); } #endif /* __APPLE__ */