bsd/dev/i386/stubs.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
  25  * Copyright (c) 1993 NeXT Computer, Inc.
  26  *
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/systm.h>
  31 #include <sys/ioctl.h>
  32 #include <sys/tty.h>
  33 #include <sys/conf.h>
  34 #include <sys/kauth.h>
  35 #include <sys/ucred.h>
  36 #include <sys/proc_internal.h>
  37 #include <sys/user.h>
  38 #include <kern/task.h>
  39 #include <kern/thread.h>
  40 #include <vm/vm_map.h>
  41
  42 /* XXX should be elsewhere (cpeak) */
  43 extern int      set_bsduthreadargs(thread_t, void *, void *);
  44 extern void     *get_bsduthreadarg(thread_t);
  45 extern int      *get_bsduthreadrval(thread_t);
  46 extern int      *get_bsduthreadlowpridelay(thread_t);
  47
  48 /*
  49  * copy a null terminated string from the kernel address space into
  50  * the user address space.
  51  *   - if the user is denied write access, return EFAULT.
  52  *   - if the end of string isn't found before
  53  *     maxlen bytes are copied,  return ENAMETOOLONG,
  54  *     indicating an incomplete copy.
  55  *   - otherwise, return 0, indicating success.
  56  * the number of bytes copied is always returned in lencopied.
  57  */
  58 int
  59 copyoutstr(const void *from, user_addr_t to, size_t maxlen, size_t *lencopied)
  60 {
  61         size_t  slen;
  62         size_t  len;
  63         int     error = 0;
  64
  65         slen = strlen(from) + 1;
  66         if (slen > maxlen)
  67                 error = ENAMETOOLONG;
  68
  69         len = min(maxlen,slen);
  70         if (copyout(from, to, len))
  71                 error = EFAULT;
  72         *lencopied = len;
  73
  74         return error;
  75 }
  76
  77
  78 /*
  79  * copy a null terminated string from one point to another in
  80  * the kernel address space.
  81  *   - no access checks are performed.
  82  *   - if the end of string isn't found before
  83  *     maxlen bytes are copied,  return ENAMETOOLONG,
  84  *     indicating an incomplete copy.
  85  *   - otherwise, return 0, indicating success.
  86  * the number of bytes copied is always returned in lencopied.
  87  */
  88 /* from ppc/fault_copy.c -Titan1T4 VERSION  */
  89 int
  90 copystr(const void *vfrom, void *vto, size_t maxlen, size_t *lencopied)
  91 {
  92         size_t          l;
  93         char const      *from = (char const *) vfrom;
  94         char            *to = (char *) vto;
  95
  96         for (l = 0; l < maxlen; l++) {
  97                 if ((*to++ = *from++) == '\0') {
  98                         if (lencopied)
  99                                 *lencopied = l + 1;
 100                         return 0;
 101                 }
 102         }
 103         if (lencopied)
 104                 *lencopied = maxlen;
 105         return ENAMETOOLONG;
 106 }
 107
 108 int
 109 copywithin(void *src, void *dst, size_t count)
 110 {
 111         bcopy(src,dst,count);
 112         return 0;
 113 }
 114
 115 int
 116 set_bsduthreadargs(thread_t th, void * pcb, __unused void *ignored_arg)
 117 {
 118         struct uthread * ut;
 119         struct proc *p = current_proc();
 120
 121         ut = get_bsdthread_info(th);
 122         ut->uu_ar0 = (int *)pcb;
 123
 124         /*
 125          * Delayed binding of thread credential to process credential.
 126          *
 127          * XXX This doesn't really belong here, but the i386 code has a
 128          * XXX number of seemingly gratuitous structural differences that
 129          * XXX make this the most appropriate place to do the work.
 130          */
 131         if (ut->uu_ucred != p->p_ucred &&
 132             (ut->uu_flag & UT_SETUID) == 0) {
 133                 kauth_cred_t old = ut->uu_ucred;
 134                 proc_lock(p);
 135                 ut->uu_ucred = p->p_ucred;
 136                 kauth_cred_ref(ut->uu_ucred);
 137                 proc_unlock(p);
 138                 if (old != NOCRED)
 139                         kauth_cred_rele(old);
 140         }
 141
 142         return(1);
 143 }
 144
 145 void *
 146 get_bsduthreadarg(thread_t th)
 147 {
 148 struct uthread *ut;
 149         ut = get_bsdthread_info(th);
 150         return((void *)(ut->uu_arg));
 151 }
 152
 153 int *
 154 get_bsduthreadrval(thread_t th)
 155 {
 156 struct uthread *ut;
 157         ut = get_bsdthread_info(th);
 158         return(&ut->uu_rval[0]);
 159 }
 160
 161 int *
 162 get_bsduthreadlowpridelay(thread_t th)
 163 {
 164 struct uthread *ut;
 165         ut = get_bsdthread_info(th);
 166         return(&ut->uu_lowpri_delay);
 167 }