bsd/dev/i386/stubs.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
  24  * Copyright (c) 1993 NeXT Computer, Inc.
  25  *
  26  */
  27
  28 #include <sys/param.h>
  29 #include <sys/systm.h>
  30 #include <sys/ioctl.h>
  31 #include <sys/tty.h>
  32 #include <sys/conf.h>
  33 #include <sys/kauth.h>
  34 #include <sys/ucred.h>
  35 #include <sys/proc_internal.h>
  36 #include <sys/user.h>
  37 #include <kern/task.h>
  38 #include <kern/thread.h>
  39 #include <vm/vm_map.h>
  40
  41 /* XXX should be elsewhere (cpeak) */
  42 extern int      set_bsduthreadargs(thread_t, void *, void *);
  43 extern void     *get_bsduthreadarg(thread_t);
  44 extern int      *get_bsduthreadrval(thread_t);
  45 extern int      *get_bsduthreadlowpridelay(thread_t);
  46
  47 /*
  48  * copy a null terminated string from the kernel address space into
  49  * the user address space.
  50  *   - if the user is denied write access, return EFAULT.
  51  *   - if the end of string isn't found before
  52  *     maxlen bytes are copied,  return ENAMETOOLONG,
  53  *     indicating an incomplete copy.
  54  *   - otherwise, return 0, indicating success.
  55  * the number of bytes copied is always returned in lencopied.
  56  */
  57 int
  58 copyoutstr(const void *from, user_addr_t to, size_t maxlen, size_t *lencopied)
  59 {
  60         size_t  slen;
  61         size_t  len;
  62         int     error = 0;
  63
  64         slen = strlen(from) + 1;
  65         if (slen > maxlen)
  66                 error = ENAMETOOLONG;
  67
  68         len = min(maxlen,slen);
  69         if (copyout(from, to, len))
  70                 error = EFAULT;
  71         *lencopied = len;
  72
  73         return error;
  74 }
  75
  76
  77 /*
  78  * copy a null terminated string from one point to another in
  79  * the kernel address space.
  80  *   - no access checks are performed.
  81  *   - if the end of string isn't found before
  82  *     maxlen bytes are copied,  return ENAMETOOLONG,
  83  *     indicating an incomplete copy.
  84  *   - otherwise, return 0, indicating success.
  85  * the number of bytes copied is always returned in lencopied.
  86  */
  87 /* from ppc/fault_copy.c -Titan1T4 VERSION  */
  88 int
  89 copystr(const void *vfrom, void *vto, size_t maxlen, size_t *lencopied)
  90 {
  91         size_t          l;
  92         char const      *from = (char const *) vfrom;
  93         char            *to = (char *) vto;
  94
  95         for (l = 0; l < maxlen; l++) {
  96                 if ((*to++ = *from++) == '\0') {
  97                         if (lencopied)
  98                                 *lencopied = l + 1;
  99                         return 0;
 100                 }
 101         }
 102         if (lencopied)
 103                 *lencopied = maxlen;
 104         return ENAMETOOLONG;
 105 }
 106
 107 int
 108 copywithin(void *src, void *dst, size_t count)
 109 {
 110         bcopy(src,dst,count);
 111         return 0;
 112 }
 113
 114 int
 115 set_bsduthreadargs(thread_t th, void * pcb, __unused void *ignored_arg)
 116 {
 117         struct uthread * ut;
 118         struct proc *p = current_proc();
 119
 120         ut = get_bsdthread_info(th);
 121         ut->uu_ar0 = (int *)pcb;
 122
 123         /*
 124          * Delayed binding of thread credential to process credential.
 125          *
 126          * XXX This doesn't really belong here, but the i386 code has a
 127          * XXX number of seemingly gratuitous structural differences that
 128          * XXX make this the most appropriate place to do the work.
 129          */
 130         if (ut->uu_ucred != p->p_ucred &&
 131             (ut->uu_flag & UT_SETUID) == 0) {
 132                 kauth_cred_t old = ut->uu_ucred;
 133                 proc_lock(p);
 134                 ut->uu_ucred = p->p_ucred;
 135                 kauth_cred_ref(ut->uu_ucred);
 136                 proc_unlock(p);
 137                 if (old != NOCRED)
 138                         kauth_cred_rele(old);
 139         }
 140
 141         return(1);
 142 }
 143
 144 void *
 145 get_bsduthreadarg(thread_t th)
 146 {
 147 struct uthread *ut;
 148         ut = get_bsdthread_info(th);
 149         return((void *)(ut->uu_arg));
 150 }
 151
 152 int *
 153 get_bsduthreadrval(thread_t th)
 154 {
 155 struct uthread *ut;
 156         ut = get_bsdthread_info(th);
 157         return(&ut->uu_rval[0]);
 158 }
 159
 160 int *
 161 get_bsduthreadlowpridelay(thread_t th)
 162 {
 163 struct uthread *ut;
 164         ut = get_bsdthread_info(th);
 165         return(&ut->uu_lowpri_delay);
 166 }