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/buf.h>
  31 #include <sys/ioctl.h>
  32 #include <sys/tty.h>
  33 #include <sys/conf.h>
  34 #include <sys/proc.h>
  35 #include <sys/user.h>
  36 #include <kern/task.h>
  37 #include <kern/thread.h>
  38 #include <kern/thread_act.h>
  39 #include <vm/vm_map.h>
  40
  41
  42 /*
  43  * copy a null terminated string from the kernel address space into
  44  * the user address space.
  45  *   - if the user is denied write access, return EFAULT.
  46  *   - if the end of string isn't found before
  47  *     maxlen bytes are copied,  return ENAMETOOLONG,
  48  *     indicating an incomplete copy.
  49  *   - otherwise, return 0, indicating success.
  50  * the number of bytes copied is always returned in lencopied.
  51  */
  52 int
  53 copyoutstr(from, to, maxlen, lencopied)
  54     void * from, * to;
  55     size_t maxlen, *lencopied;
  56 {
  57         int slen,len,error=0;
  58
  59         slen = strlen(from) + 1;
  60         if (slen > maxlen)
  61                 error = ENAMETOOLONG;
  62
  63         len = min(maxlen,slen);
  64         if (copyout(from, to, len))
  65                 error = EFAULT;
  66         *lencopied = len;
  67
  68         return error;
  69 }
  70
  71
  72 /*
  73  * copy a null terminated string from one point to another in
  74  * the kernel address space.
  75  *   - no access checks are performed.
  76  *   - if the end of string isn't found before
  77  *     maxlen bytes are copied,  return ENAMETOOLONG,
  78  *     indicating an incomplete copy.
  79  *   - otherwise, return 0, indicating success.
  80  * the number of bytes copied is always returned in lencopied.
  81  */
  82 /* from ppc/fault_copy.c -Titan1T4 VERSION  */
  83 int
  84 copystr(vfrom, vto, maxlen, lencopied)
  85     register void * vfrom, *vto;
  86     size_t maxlen, *lencopied;
  87 {
  88     register unsigned l;
  89     int error;
  90 caddr_t from, to;
  91
  92         from = vfrom;
  93         to = vto;
  94     for (l = 0; l < maxlen; l++)
  95         if ((*to++ = *from++) == '\0') {
  96             if (lencopied)
  97                 *lencopied = l + 1;
  98             return 0;
  99         }
 100     if (lencopied)
 101         *lencopied = maxlen;
 102     return ENAMETOOLONG;
 103 }
 104
 105 int copywithin(src, dst, count)
 106 void  * src, *dst;
 107 size_t count;
 108 {
 109         bcopy(src,dst,count);
 110         return 0;
 111 }
 112
 113 set_bsduthreadargs(thread_t th, void * pcb, void *ignored_arg)
 114 {
 115 struct uthread * ut;
 116
 117         ut = get_bsdthread_info(th);
 118         ut->uu_ar0 = (int *)pcb;
 119
 120         return(1);
 121 }
 122
 123 void *
 124 get_bsduthreadarg(thread_t th)
 125 {
 126 struct uthread *ut;
 127         ut = get_bsdthread_info(th);
 128         return((void *)(ut->uu_arg));
 129 }
 130
 131 int *
 132 get_bsduthreadrval(thread_act_t th)
 133 {
 134 struct uthread *ut;
 135         ut = get_bsdthread_info(th);
 136         return(&ut->uu_rval[0]);
 137 }