ppc/sys/getpid.s

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 #include "SYS.h"
  24         .data
  25         EXPORT(__current_pid)
  26         .long 0
  27
  28 TEXT
  29 LEAF(_getpid)
  30 #if defined(__DYNAMIC__)
  31         mflr    r0
  32         bcl    20,31,1f
  33 1:
  34         mflr    r5
  35         mtlr    r0
  36         addis   r5, r5, ha16(__current_pid - 1b)
  37         addi    r5, r5, lo16(__current_pid - 1b)
  38 #else
  39         lis     r5,ha16(__current_pid)
  40         ori     r5,r5,lo16(__current_pid)
  41 #endif
  42         lwz     r3,0(r5)                // get the cached pid
  43         cmpwi   r3,0                    // if positive,
  44         bgtlr+                          // return it
  45
  46         SYSCALL_NONAME(getpid, 0)
  47
  48         lwarx   r4,0,r5                 // see if we can cache it
  49         cmpwi   r4,0                    // we cant if there are any
  50         bltlr-                          // vforks in progress
  51
  52         stwcx.  r3,0,r5                 // ignore cache conflicts
  53         blr
  54 END(_getpid)