bsd/dev/i386/stubs.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
  27  * Copyright (c) 1993 NeXT Computer, Inc.
  28  *
  29  */
  30
  31 #include <sys/param.h>
  32 #include <sys/systm.h>
  33 #include <sys/buf.h>
  34 #include <sys/ioctl.h>
  35 #include <sys/tty.h>
  36 #include <sys/conf.h>
  37 #include <sys/proc.h>
  38 #include <sys/user.h>
  39 #include <kern/task.h>
  40 #include <kern/thread.h>
  41 #include <kern/thread_act.h>
  42 #include <vm/vm_map.h>
  43
  44
  45 /*
  46  * copy a null terminated string from the kernel address space into
  47  * the user address space.
  48  *   - if the user is denied write access, return EFAULT.
  49  *   - if the end of string isn't found before
  50  *     maxlen bytes are copied,  return ENAMETOOLONG,
  51  *     indicating an incomplete copy.
  52  *   - otherwise, return 0, indicating success.
  53  * the number of bytes copied is always returned in lencopied.
  54  */
  55 int
  56 copyoutstr(from, to, maxlen, lencopied)
  57     void * from, * to;
  58     size_t maxlen, *lencopied;
  59 {
  60         int slen,len,error=0;
  61
  62         slen = strlen(from) + 1;
  63         if (slen > maxlen)
  64                 error = ENAMETOOLONG;
  65
  66         len = min(maxlen,slen);
  67         if (copyout(from, to, len))
  68                 error = EFAULT;
  69         *lencopied = len;
  70
  71         return error;
  72 }
  73
  74
  75 /*
  76  * copy a null terminated string from one point to another in
  77  * the kernel address space.
  78  *   - no access checks are performed.
  79  *   - if the end of string isn't found before
  80  *     maxlen bytes are copied,  return ENAMETOOLONG,
  81  *     indicating an incomplete copy.
  82  *   - otherwise, return 0, indicating success.
  83  * the number of bytes copied is always returned in lencopied.
  84  */
  85 /* from ppc/fault_copy.c -Titan1T4 VERSION  */
  86 int
  87 copystr(vfrom, vto, maxlen, lencopied)
  88     register void * vfrom, *vto;
  89     size_t maxlen, *lencopied;
  90 {
  91     register unsigned l;
  92     int error;
  93 caddr_t from, to;
  94
  95         from = vfrom;
  96         to = vto;
  97     for (l = 0; l < maxlen; l++)
  98         if ((*to++ = *from++) == '\0') {
  99             if (lencopied)
 100                 *lencopied = l + 1;
 101             return 0;
 102         }
 103     if (lencopied)
 104         *lencopied = maxlen;
 105     return ENAMETOOLONG;
 106 }
 107
 108 int copywithin(src, dst, count)
 109 void  * src, *dst;
 110 size_t count;
 111 {
 112         bcopy(src,dst,count);
 113         return 0;
 114 }
 115
 116 set_bsduthreadargs(thread_t th, void * pcb, void *ignored_arg)
 117 {
 118 struct uthread * ut;
 119
 120         ut = get_bsdthread_info(th);
 121         ut->uu_ar0 = (int *)pcb;
 122
 123         return(1);
 124 }
 125
 126 void *
 127 get_bsduthreadarg(thread_t th)
 128 {
 129 struct uthread *ut;
 130         ut = get_bsdthread_info(th);
 131         return((void *)(ut->uu_arg));
 132 }
 133
 134 int *
 135 get_bsduthreadrval(thread_act_t th)
 136 {
 137 struct uthread *ut;
 138         ut = get_bsdthread_info(th);
 139         return(&ut->uu_rval[0]);
 140 }