bsd/dev/i386/stubs.c

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
  32  * Copyright (c) 1993 NeXT Computer, Inc.
  33  *
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/tty.h>
  40 #include <sys/conf.h>
  41 #include <sys/kauth.h>
  42 #include <sys/ucred.h>
  43 #include <sys/proc_internal.h>
  44 #include <sys/user.h>
  45 #include <kern/task.h>
  46 #include <kern/thread.h>
  47 #include <vm/vm_map.h>
  48
  49 /* XXX should be elsewhere (cpeak) */
  50 extern int      set_bsduthreadargs(thread_t, void *, void *);
  51 extern void     *get_bsduthreadarg(thread_t);
  52 extern int      *get_bsduthreadrval(thread_t);
  53 extern int      *get_bsduthreadlowpridelay(thread_t);
  54
  55 /*
  56  * copy a null terminated string from the kernel address space into
  57  * the user address space.
  58  *   - if the user is denied write access, return EFAULT.
  59  *   - if the end of string isn't found before
  60  *     maxlen bytes are copied,  return ENAMETOOLONG,
  61  *     indicating an incomplete copy.
  62  *   - otherwise, return 0, indicating success.
  63  * the number of bytes copied is always returned in lencopied.
  64  */
  65 int
  66 copyoutstr(const void *from, user_addr_t to, size_t maxlen, size_t *lencopied)
  67 {
  68         size_t  slen;
  69         size_t  len;
  70         int     error = 0;
  71
  72         slen = strlen(from) + 1;
  73         if (slen > maxlen)
  74                 error = ENAMETOOLONG;
  75
  76         len = min(maxlen,slen);
  77         if (copyout(from, to, len))
  78                 error = EFAULT;
  79         *lencopied = len;
  80
  81         return error;
  82 }
  83
  84
  85 /*
  86  * copy a null terminated string from one point to another in
  87  * the kernel address space.
  88  *   - no access checks are performed.
  89  *   - if the end of string isn't found before
  90  *     maxlen bytes are copied,  return ENAMETOOLONG,
  91  *     indicating an incomplete copy.
  92  *   - otherwise, return 0, indicating success.
  93  * the number of bytes copied is always returned in lencopied.
  94  */
  95 /* from ppc/fault_copy.c -Titan1T4 VERSION  */
  96 int
  97 copystr(const void *vfrom, void *vto, size_t maxlen, size_t *lencopied)
  98 {
  99         size_t          l;
 100         char const      *from = (char const *) vfrom;
 101         char            *to = (char *) vto;
 102
 103         for (l = 0; l < maxlen; l++) {
 104                 if ((*to++ = *from++) == '\0') {
 105                         if (lencopied)
 106                                 *lencopied = l + 1;
 107                         return 0;
 108                 }
 109         }
 110         if (lencopied)
 111                 *lencopied = maxlen;
 112         return ENAMETOOLONG;
 113 }
 114
 115 int
 116 copywithin(void *src, void *dst, size_t count)
 117 {
 118         bcopy(src,dst,count);
 119         return 0;
 120 }
 121
 122 int
 123 set_bsduthreadargs(thread_t th, void * pcb, __unused void *ignored_arg)
 124 {
 125         struct uthread * ut;
 126         struct proc *p = current_proc();
 127
 128         ut = get_bsdthread_info(th);
 129         ut->uu_ar0 = (int *)pcb;
 130
 131         /*
 132          * Delayed binding of thread credential to process credential.
 133          *
 134          * XXX This doesn't really belong here, but the i386 code has a
 135          * XXX number of seemingly gratuitous structural differences that
 136          * XXX make this the most appropriate place to do the work.
 137          */
 138         if (ut->uu_ucred != p->p_ucred &&
 139             (ut->uu_flag & UT_SETUID) == 0) {
 140                 kauth_cred_t old = ut->uu_ucred;
 141                 proc_lock(p);
 142                 ut->uu_ucred = p->p_ucred;
 143                 kauth_cred_ref(ut->uu_ucred);
 144                 proc_unlock(p);
 145                 if (old != NOCRED)
 146                         kauth_cred_rele(old);
 147         }
 148
 149         return(1);
 150 }
 151
 152 void *
 153 get_bsduthreadarg(thread_t th)
 154 {
 155 struct uthread *ut;
 156         ut = get_bsdthread_info(th);
 157         return((void *)(ut->uu_arg));
 158 }
 159
 160 int *
 161 get_bsduthreadrval(thread_t th)
 162 {
 163 struct uthread *ut;
 164         ut = get_bsdthread_info(th);
 165         return(&ut->uu_rval[0]);
 166 }
 167
 168 int *
 169 get_bsduthreadlowpridelay(thread_t th)
 170 {
 171 struct uthread *ut;
 172         ut = get_bsdthread_info(th);
 173         return(&ut->uu_lowpri_delay);
 174 }