ppc/sys/getpid.s

   1 /*
   2  * Copyright (c) 1999 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 #include "SYS.h"
  26         .data
  27         EXPORT(__current_pid)
  28         .long 0
  29
  30 TEXT
  31 LEAF(_getpid)
  32 #if defined(__DYNAMIC__)
  33         mflr    r0
  34         bcl    20,31,1f
  35 1:
  36         mflr    r5
  37         mtlr    r0
  38         addis   r5, r5, ha16(__current_pid - 1b)
  39         addi    r5, r5, lo16(__current_pid - 1b)
  40 #else
  41         lis     r5,ha16(__current_pid)
  42         ori     r5,r5,lo16(__current_pid)
  43 #endif
  44         lwz     r3,0(r5)                // get the cached pid
  45         cmpwi   r3,0                    // if positive,
  46         bgtlr+                          // return it
  47
  48         SYSCALL_NONAME(getpid, 0)
  49
  50         lwarx   r4,0,r5                 // see if we can cache it
  51         cmpwi   r4,0                    // we cant if there are any
  52         bltlr-                          // vforks in progress
  53
  54         stwcx.  r3,0,r5                 // ignore cache conflicts
  55         blr
  56 END(_getpid)