kernel/fs/doorfs/door_support_i386.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 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/types.h>
  30 #include <sys/systm.h>
  31 #include <sys/door.h>
  32 #include <sys/proc.h>
  33 #include <sys/thread.h>
  34 #include <sys/stack.h>
  35 #include <sys/privregs.h>
  36
  37 int
  38 door_finish_dispatch(caddr_t newsp)
  39 {
  40         void lwp_setsp(klwp_t *, caddr_t);
  41
  42         /*
  43          * If being traced, need to copy in syscall arguments for /proc
  44          * before changing the sp.  In most cases, this will have no
  45          * effect, since we'll have already done this in door_return().
  46          */
  47         if (curthread->t_post_sys && PTOU(ttoproc(curthread))->u_systrap)
  48                 (void) save_syscall_args();
  49         lwp_setsp(ttolwp(curthread), newsp);
  50         lwptoregs(ttolwp(curthread))->r_fp = 0; /* stack ends here */
  51
  52         return (0);
  53 }
  54
  55 /*ARGSUSED*/
  56 uintptr_t
  57 door_final_sp(uintptr_t resultsp, size_t align, int datamodel)
  58 {
  59         return (resultsp);
  60 }