usr/src/ucbcmd/sbcp/sbcp_util.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/auxv.h>
  30 #include <sys/types.h>
  31
  32 void
  33 sbcp_init(int argc, char *argv[], char *envp[])
  34 {
  35         auxv_t                  *ap;
  36         uintptr_t               *p;
  37         int                     err;
  38
  39         /*
  40          * Find the aux vector on the stack.
  41          */
  42         p = (uintptr_t *)envp;
  43         while (*p != NULL)
  44                 p++;
  45
  46         /*
  47          * p is now pointing at the 0 word after the environ pointers.
  48          * After that is the aux vectors.
  49          *
  50          * We need to clear the AF_SUN_NOPLM flag from the AT_SUN_AUXFLAGS
  51          * aux vector.  This flag told our linker that we don't have a
  52          * primary link map.  Now that our linker is done initializing, we
  53          * want to clear this flag before we transfer control to the
  54          * applications copy of the linker, since we want that linker to have
  55          * a primary link map which will be the link map for the application
  56          * we're running.
  57          */
  58         p++;
  59         for (ap = (auxv_t *)p; ap->a_type != AT_NULL; ap++) {
  60                 switch (ap->a_type) {
  61                         case AT_SUN_AUXFLAGS:
  62                                 ap->a_un.a_val &= ~AF_SUN_NOPLM;
  63                                 break;
  64                         default:
  65                                 break;
  66                 }
  67         }
  68 }