1/*
2 * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*
29 * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
30 * Copyright (c) 1993 NeXT Computer, Inc.
31 *
32 */
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/ioctl.h>
37#include <sys/tty.h>
38#include <sys/conf.h>
39#include <sys/kauth.h>
40#include <sys/ucred.h>
41#include <sys/proc_internal.h>
42#include <sys/user.h>
43#include <kern/task.h>
44#include <kern/thread.h>
45#include <vm/vm_map.h>
46#include <machine/machine_routines.h>
47
48/* XXX should be elsewhere (cpeak) */
49extern void	*get_bsduthreadarg(thread_t);
50extern int	*get_bsduthreadrval(thread_t);
51extern void	*find_user_regs(thread_t);
52
53/*
54 * copy a null terminated string from the kernel address space into
55 * the user address space.
56 *   - if the user is denied write access, return EFAULT.
57 *   - if the end of string isn't found before
58 *     maxlen bytes are copied,  return ENAMETOOLONG,
59 *     indicating an incomplete copy.
60 *   - otherwise, return 0, indicating success.
61 * the number of bytes copied is always returned in lencopied.
62 */
63int
64copyoutstr(const void *from, user_addr_t to, size_t maxlen, size_t *lencopied)
65{
66	size_t	slen;
67	size_t	len;
68	int	error = 0;
69
70	slen = strlen(from) + 1;
71	if (slen > maxlen)
72		error = ENAMETOOLONG;
73
74	len = min(maxlen,slen);
75	if (copyout(from, to, len))
76		error = EFAULT;
77	*lencopied = len;
78
79	return error;
80}
81
82
83/*
84 * copy a null terminated string from one point to another in
85 * the kernel address space.
86 *   - no access checks are performed.
87 *   - if the end of string isn't found before
88 *     maxlen bytes are copied,  return ENAMETOOLONG,
89 *     indicating an incomplete copy.
90 *   - otherwise, return 0, indicating success.
91 * the number of bytes copied is always returned in lencopied.
92 */
93/* from ppc/fault_copy.c -Titan1T4 VERSION  */
94int
95copystr(const void *vfrom, void *vto, size_t maxlen, size_t *lencopied)
96{
97	size_t		l;
98	char const	*from = (char const *) vfrom;
99	char		*to = (char *) vto;
100
101	for (l = 0; l < maxlen; l++) {
102		if ((*to++ = *from++) == '\0') {
103			if (lencopied)
104				*lencopied = l + 1;
105			return 0;
106		}
107	}
108	if (lencopied)
109		*lencopied = maxlen;
110	return ENAMETOOLONG;
111}
112
113int
114copywithin(void *src, void *dst, size_t count)
115{
116	bcopy(src,dst,count);
117	return 0;
118}
119
120void *
121get_bsduthreadarg(thread_t th)
122{
123	struct uthread  *ut;
124	ut = get_bsdthread_info(th);
125	return ut->uu_ap;
126}
127
128int *
129get_bsduthreadrval(thread_t th)
130{
131struct uthread *ut;
132
133	ut = get_bsdthread_info(th);
134	return(&ut->uu_rval[0]);
135}
136