/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ #include "SYS.h" .data .globl __current_pid .align 2 __current_pid: .long 0 MI_ENTRY_POINT(_getpid) #if defined(__DYNAMIC__) mflr r0 // note we cannot use MI_GET_ADDRESS... bcl 20,31,1f // ...because we define __current_pid 1: mflr r5 mtlr r0 addis r5, r5, ha16(__current_pid - 1b) addi r5, r5, lo16(__current_pid - 1b) #else lis r5,hi16(__current_pid) ori r5,r5,lo16(__current_pid) #endif lwz r3,0(r5) // get the cached pid cmpwi r3,0 // if positive, bgtlr++ // return it SYSCALL_NONAME(getpid, 0) lwarx r4,0,r5 // see if we can cache it cmpwi r4,0 // we can't if there are any... blt-- 1f // ...vforks in progress stwcx. r3,0,r5 // ignore cache conflicts blr 1: li r6,-4 // on 970, cancel the reservation using red zone... stwcx. r3,r6,r1 // ...to avoid an errata blr