1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate /* 30*0Sstevel@tonic-gate * Miscellaneous C routines for copying data around without 31*0Sstevel@tonic-gate * descending into assembler. Compilers are pretty good at 32*0Sstevel@tonic-gate * scheduling instructions, and humans are pretty hopeless at 33*0Sstevel@tonic-gate * writing correct assembler. 34*0Sstevel@tonic-gate */ 35*0Sstevel@tonic-gate 36*0Sstevel@tonic-gate #include <sys/types.h> 37*0Sstevel@tonic-gate #include <sys/systm.h> 38*0Sstevel@tonic-gate #include <sys/errno.h> 39*0Sstevel@tonic-gate #include <sys/param.h> 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate /* 42*0Sstevel@tonic-gate * copyinstr_noerr and copyoutstr_noerr can be implemented completely 43*0Sstevel@tonic-gate * in C on machines with shared user and kernel context. 44*0Sstevel@tonic-gate */ 45*0Sstevel@tonic-gate static int 46*0Sstevel@tonic-gate copystr_nofault(const char *src, char *dst, size_t maxlength, 47*0Sstevel@tonic-gate size_t *lencopied) 48*0Sstevel@tonic-gate { 49*0Sstevel@tonic-gate int error = 0; 50*0Sstevel@tonic-gate size_t leftover; 51*0Sstevel@tonic-gate 52*0Sstevel@tonic-gate if ((leftover = maxlength) == 0) 53*0Sstevel@tonic-gate error = ENAMETOOLONG; 54*0Sstevel@tonic-gate else 55*0Sstevel@tonic-gate do { 56*0Sstevel@tonic-gate leftover--; 57*0Sstevel@tonic-gate if ((*dst++ = *src++) == '\0') 58*0Sstevel@tonic-gate break; 59*0Sstevel@tonic-gate if (leftover == 0) { 60*0Sstevel@tonic-gate error = ENAMETOOLONG; 61*0Sstevel@tonic-gate break; 62*0Sstevel@tonic-gate } 63*0Sstevel@tonic-gate /*CONSTCOND*/ 64*0Sstevel@tonic-gate } while (1); 65*0Sstevel@tonic-gate 66*0Sstevel@tonic-gate if (lencopied) 67*0Sstevel@tonic-gate *lencopied = maxlength - leftover; 68*0Sstevel@tonic-gate return (error); 69*0Sstevel@tonic-gate } 70*0Sstevel@tonic-gate 71*0Sstevel@tonic-gate 72*0Sstevel@tonic-gate int 73*0Sstevel@tonic-gate copyinstr_noerr(const char *uaddr, char *kaddr, size_t maxlength, 74*0Sstevel@tonic-gate size_t *lencopied) 75*0Sstevel@tonic-gate { 76*0Sstevel@tonic-gate char *ua = (char *)uaddr; 77*0Sstevel@tonic-gate 78*0Sstevel@tonic-gate ASSERT((uintptr_t)kaddr > kernelbase); 79*0Sstevel@tonic-gate 80*0Sstevel@tonic-gate if ((uintptr_t)ua > kernelbase) { 81*0Sstevel@tonic-gate /* 82*0Sstevel@tonic-gate * force fault at kernelbase 83*0Sstevel@tonic-gate */ 84*0Sstevel@tonic-gate ua = (char *)kernelbase; 85*0Sstevel@tonic-gate } 86*0Sstevel@tonic-gate return (copystr_nofault(ua, kaddr, maxlength, lencopied)); 87*0Sstevel@tonic-gate } 88*0Sstevel@tonic-gate 89*0Sstevel@tonic-gate int 90*0Sstevel@tonic-gate copyoutstr_noerr(const char *kaddr, char *uaddr, size_t maxlength, 91*0Sstevel@tonic-gate size_t *lencopied) 92*0Sstevel@tonic-gate { 93*0Sstevel@tonic-gate char *ua = (char *)uaddr; 94*0Sstevel@tonic-gate 95*0Sstevel@tonic-gate ASSERT((uintptr_t)kaddr > kernelbase); 96*0Sstevel@tonic-gate 97*0Sstevel@tonic-gate if ((uintptr_t)ua > kernelbase) { 98*0Sstevel@tonic-gate /* 99*0Sstevel@tonic-gate * force fault at kernelbase 100*0Sstevel@tonic-gate */ 101*0Sstevel@tonic-gate ua = (char *)kernelbase; 102*0Sstevel@tonic-gate } 103*0Sstevel@tonic-gate return (copystr_nofault(kaddr, ua, maxlength, lencopied)); 104*0Sstevel@tonic-gate } 105