1*33de042dSApple OSS Distributions /* 2*33de042dSApple OSS Distributions * Copyright (c) 2000,2008-2012 Apple Inc. All rights reserved. 3*33de042dSApple OSS Distributions * 4*33de042dSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*33de042dSApple OSS Distributions * 6*33de042dSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*33de042dSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*33de042dSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*33de042dSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*33de042dSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*33de042dSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*33de042dSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*33de042dSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*33de042dSApple OSS Distributions * 15*33de042dSApple OSS Distributions * Please obtain a copy of the License at 16*33de042dSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*33de042dSApple OSS Distributions * 18*33de042dSApple OSS Distributions * The Original Code and all software distributed under the License are 19*33de042dSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*33de042dSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*33de042dSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*33de042dSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*33de042dSApple OSS Distributions * Please see the License for the specific language governing rights and 24*33de042dSApple OSS Distributions * limitations under the License. 25*33de042dSApple OSS Distributions * 26*33de042dSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*33de042dSApple OSS Distributions */ 28*33de042dSApple OSS Distributions /* 29*33de042dSApple OSS Distributions * Subtle combination of files and libraries make up the C++ runtime system for kernel modules. We are dependant on the KernelModule kmod.make and CreateKModInfo.perl scripts to be exactly instep with both this library module and the libkmod module as well. 30*33de042dSApple OSS Distributions * 31*33de042dSApple OSS Distributions * If you do any maintenance on any of the following files make sure great care is taken to keep them in Sync. 32*33de042dSApple OSS Distributions * KernelModule.bproj/kmod.make 33*33de042dSApple OSS Distributions * KernelModule.bproj/CreateKModInfo.perl 34*33de042dSApple OSS Distributions * KernelModule.bproj/kmodc++/pure.c 35*33de042dSApple OSS Distributions * KernelModule.bproj/kmodc++/cplus_start.c 36*33de042dSApple OSS Distributions * KernelModule.bproj/kmodc++/cplus_start.c 37*33de042dSApple OSS Distributions * KernelModule.bproj/kmodc/c_start.c 38*33de042dSApple OSS Distributions * KernelModule.bproj/kmodc/c_stop.c 39*33de042dSApple OSS Distributions * 40*33de042dSApple OSS Distributions * The trick is that the linkline links all of the developers modules. If any static constructors are used .constructors_used will be left as an undefined symbol. This symbol is exported by the cplus_start.c routine which automatically brings in the appropriate C++ _start routine. However the actual _start symbol is only required by the kmod_info structure that is created and initialized by the CreateKModInfo.perl script. If no C++ was used the _start will be an undefined symbol that is finally satisfied by the c_start module in the kmod library. 41*33de042dSApple OSS Distributions * 42*33de042dSApple OSS Distributions * The linkline must look like this. 43*33de042dSApple OSS Distributions *.o -lkmodc++ kmod_info.o -lkmod 44*33de042dSApple OSS Distributions */ 45