17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * CDDL HEADER START
37c478bd9Sstevel@tonic-gate *
47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
57c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
67c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
77c478bd9Sstevel@tonic-gate * with the License.
87c478bd9Sstevel@tonic-gate *
97c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
107c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
117c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
127c478bd9Sstevel@tonic-gate * and limitations under the License.
137c478bd9Sstevel@tonic-gate *
147c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
157c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
167c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
177c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
187c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
197c478bd9Sstevel@tonic-gate *
207c478bd9Sstevel@tonic-gate * CDDL HEADER END
217c478bd9Sstevel@tonic-gate */
227c478bd9Sstevel@tonic-gate /*
237c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
247c478bd9Sstevel@tonic-gate * Use is subject to license terms.
257c478bd9Sstevel@tonic-gate */
267c478bd9Sstevel@tonic-gate
277c478bd9Sstevel@tonic-gate /*
287c478bd9Sstevel@tonic-gate * Miscellaneous C routines for copying data around without
297c478bd9Sstevel@tonic-gate * descending into assembler. Compilers are pretty good at
307c478bd9Sstevel@tonic-gate * scheduling instructions, and humans are pretty hopeless at
317c478bd9Sstevel@tonic-gate * writing correct assembler.
327c478bd9Sstevel@tonic-gate */
337c478bd9Sstevel@tonic-gate
347c478bd9Sstevel@tonic-gate #include <sys/types.h>
357c478bd9Sstevel@tonic-gate #include <sys/systm.h>
367c478bd9Sstevel@tonic-gate #include <sys/errno.h>
377c478bd9Sstevel@tonic-gate #include <sys/param.h>
387c478bd9Sstevel@tonic-gate
397c478bd9Sstevel@tonic-gate /*
407c478bd9Sstevel@tonic-gate * copyinstr_noerr and copyoutstr_noerr can be implemented completely
417c478bd9Sstevel@tonic-gate * in C on machines with shared user and kernel context.
427c478bd9Sstevel@tonic-gate */
437c478bd9Sstevel@tonic-gate static int
copystr_nofault(const char * src,char * dst,size_t maxlength,size_t * lencopied)447c478bd9Sstevel@tonic-gate copystr_nofault(const char *src, char *dst, size_t maxlength,
457c478bd9Sstevel@tonic-gate size_t *lencopied)
467c478bd9Sstevel@tonic-gate {
477c478bd9Sstevel@tonic-gate int error = 0;
487c478bd9Sstevel@tonic-gate size_t leftover;
497c478bd9Sstevel@tonic-gate
507c478bd9Sstevel@tonic-gate if ((leftover = maxlength) == 0)
517c478bd9Sstevel@tonic-gate error = ENAMETOOLONG;
527c478bd9Sstevel@tonic-gate else
537c478bd9Sstevel@tonic-gate do {
547c478bd9Sstevel@tonic-gate leftover--;
557c478bd9Sstevel@tonic-gate if ((*dst++ = *src++) == '\0')
567c478bd9Sstevel@tonic-gate break;
577c478bd9Sstevel@tonic-gate if (leftover == 0) {
587c478bd9Sstevel@tonic-gate error = ENAMETOOLONG;
597c478bd9Sstevel@tonic-gate break;
607c478bd9Sstevel@tonic-gate }
617c478bd9Sstevel@tonic-gate /*CONSTCOND*/
627c478bd9Sstevel@tonic-gate } while (1);
637c478bd9Sstevel@tonic-gate
647c478bd9Sstevel@tonic-gate if (lencopied)
657c478bd9Sstevel@tonic-gate *lencopied = maxlength - leftover;
667c478bd9Sstevel@tonic-gate return (error);
677c478bd9Sstevel@tonic-gate }
687c478bd9Sstevel@tonic-gate
697c478bd9Sstevel@tonic-gate
707c478bd9Sstevel@tonic-gate int
copyinstr_noerr(const char * uaddr,char * kaddr,size_t maxlength,size_t * lencopied)717c478bd9Sstevel@tonic-gate copyinstr_noerr(const char *uaddr, char *kaddr, size_t maxlength,
727c478bd9Sstevel@tonic-gate size_t *lencopied)
737c478bd9Sstevel@tonic-gate {
747c478bd9Sstevel@tonic-gate char *ua = (char *)uaddr;
757c478bd9Sstevel@tonic-gate
767c478bd9Sstevel@tonic-gate ASSERT((uintptr_t)kaddr > kernelbase);
777c478bd9Sstevel@tonic-gate
787c478bd9Sstevel@tonic-gate if ((uintptr_t)ua > kernelbase) {
797c478bd9Sstevel@tonic-gate /*
807c478bd9Sstevel@tonic-gate * force fault at kernelbase
817c478bd9Sstevel@tonic-gate */
827c478bd9Sstevel@tonic-gate ua = (char *)kernelbase;
837c478bd9Sstevel@tonic-gate }
847c478bd9Sstevel@tonic-gate return (copystr_nofault(ua, kaddr, maxlength, lencopied));
857c478bd9Sstevel@tonic-gate }
867c478bd9Sstevel@tonic-gate
877c478bd9Sstevel@tonic-gate int
copyoutstr_noerr(const char * kaddr,char * uaddr,size_t maxlength,size_t * lencopied)887c478bd9Sstevel@tonic-gate copyoutstr_noerr(const char *kaddr, char *uaddr, size_t maxlength,
897c478bd9Sstevel@tonic-gate size_t *lencopied)
907c478bd9Sstevel@tonic-gate {
917c478bd9Sstevel@tonic-gate char *ua = (char *)uaddr;
927c478bd9Sstevel@tonic-gate
937c478bd9Sstevel@tonic-gate ASSERT((uintptr_t)kaddr > kernelbase);
947c478bd9Sstevel@tonic-gate
957c478bd9Sstevel@tonic-gate if ((uintptr_t)ua > kernelbase) {
967c478bd9Sstevel@tonic-gate /*
977c478bd9Sstevel@tonic-gate * force fault at kernelbase
987c478bd9Sstevel@tonic-gate */
997c478bd9Sstevel@tonic-gate ua = (char *)kernelbase;
1007c478bd9Sstevel@tonic-gate }
1017c478bd9Sstevel@tonic-gate return (copystr_nofault(kaddr, ua, maxlength, lencopied));
1027c478bd9Sstevel@tonic-gate }
103