usr/src/lib/libtnfprobe/i386_locks.s

   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 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27         .ident  "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/asm_linkage.h>
  30         .file           "i386_locks.s"
  31         ENTRY(tnfw_b_get_lock)
  32 #if defined (__amd64)
  33         /* XX64 - fix me */
  34 #else
  35         movl    4(%esp), %edx
  36         subl    %eax, %eax
  37         lock
  38         btsl    $0, (%edx)
  39         jnc     .L1
  40         incl    %eax
  41 .L1:
  42 #endif
  43         ret
  44
  45         ENTRY(tnfw_b_clear_lock)
  46 #if defined (__amd64)
  47         /* XX64 - fix me */
  48 #else
  49         movl    4(%esp), %eax
  50         movb    $0, (%eax)
  51 #endif
  52         ret
  53
  54         ENTRY(tnfw_b_atomic_swap)
  55 #if defined (__amd64)
  56         /* XX64 - fix me */
  57 #else
  58         movl    4(%esp), %edx
  59         movl    8(%esp), %eax
  60         xchgl   %eax, (%edx)
  61 #endif
  62         ret