bsd/dev/i386/stubs.c

   1 /*
   2  * Copyright (c) 2000 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
  47 /* XXX should be elsewhere (cpeak) */
  48 extern int      set_bsduthreadargs(thread_t, void *, void *);
  49 extern void     *get_bsduthreadarg(thread_t);
  50 extern int      *get_bsduthreadrval(thread_t);
  51 extern int      *get_bsduthreadlowpridelay(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  */
  63 int
  64 copyoutstr(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  */
  94 int
  95 copystr(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
 113 int
 114 copywithin(void *src, void *dst, size_t count)
 115 {
 116         bcopy(src,dst,count);
 117         return 0;
 118 }
 119
 120 int
 121 set_bsduthreadargs(thread_t th, void * pcb, __unused void *ignored_arg)
 122 {
 123         struct uthread * ut;
 124         struct proc *p = current_proc();
 125
 126         ut = get_bsdthread_info(th);
 127         ut->uu_ar0 = (int *)pcb;
 128
 129         /*
 130          * Delayed binding of thread credential to process credential.
 131          *
 132          * XXX This doesn't really belong here, but the i386 code has a
 133          * XXX number of seemingly gratuitous structural differences that
 134          * XXX make this the most appropriate place to do the work.
 135          */
 136         if (ut->uu_ucred != p->p_ucred &&
 137             (ut->uu_flag & UT_SETUID) == 0) {
 138                 kauth_cred_t old = ut->uu_ucred;
 139                 proc_lock(p);
 140                 ut->uu_ucred = p->p_ucred;
 141                 kauth_cred_ref(ut->uu_ucred);
 142                 proc_unlock(p);
 143                 if (old != NOCRED)
 144                         kauth_cred_rele(old);
 145         }
 146
 147         return(1);
 148 }
 149
 150 void *
 151 get_bsduthreadarg(thread_t th)
 152 {
 153 struct uthread *ut;
 154         ut = get_bsdthread_info(th);
 155         return((void *)(ut->uu_arg));
 156 }
 157
 158 int *
 159 get_bsduthreadrval(thread_t th)
 160 {
 161 struct uthread *ut;
 162         ut = get_bsdthread_info(th);
 163         return(&ut->uu_rval[0]);
 164 }
 165
 166 int *
 167 get_bsduthreadlowpridelay(thread_t th)
 168 {
 169 struct uthread *ut;
 170         ut = get_bsdthread_info(th);
 171         return(&ut->uu_lowpri_delay);
 172 }