1*c54f35caSApple OSS Distributions /* 2*c54f35caSApple OSS Distributions * Copyright (c) 2000,2008-2012 Apple Inc. All rights reserved. 3*c54f35caSApple OSS Distributions * 4*c54f35caSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*c54f35caSApple OSS Distributions * 6*c54f35caSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*c54f35caSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*c54f35caSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*c54f35caSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*c54f35caSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*c54f35caSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*c54f35caSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*c54f35caSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*c54f35caSApple OSS Distributions * 15*c54f35caSApple OSS Distributions * Please obtain a copy of the License at 16*c54f35caSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*c54f35caSApple OSS Distributions * 18*c54f35caSApple OSS Distributions * The Original Code and all software distributed under the License are 19*c54f35caSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*c54f35caSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*c54f35caSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*c54f35caSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*c54f35caSApple OSS Distributions * Please see the License for the specific language governing rights and 24*c54f35caSApple OSS Distributions * limitations under the License. 25*c54f35caSApple OSS Distributions * 26*c54f35caSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*c54f35caSApple OSS Distributions */ 28*c54f35caSApple OSS Distributions /* 29*c54f35caSApple 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*c54f35caSApple OSS Distributions * 31*c54f35caSApple 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*c54f35caSApple OSS Distributions * KernelModule.bproj/kmod.make 33*c54f35caSApple OSS Distributions * KernelModule.bproj/CreateKModInfo.perl 34*c54f35caSApple OSS Distributions * KernelModule.bproj/kmodc++/pure.c 35*c54f35caSApple OSS Distributions * KernelModule.bproj/kmodc++/cplus_start.c 36*c54f35caSApple OSS Distributions * KernelModule.bproj/kmodc++/cplus_start.c 37*c54f35caSApple OSS Distributions * KernelModule.bproj/kmodc/c_start.c 38*c54f35caSApple OSS Distributions * KernelModule.bproj/kmodc/c_stop.c 39*c54f35caSApple OSS Distributions * 40*c54f35caSApple 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*c54f35caSApple OSS Distributions * 42*c54f35caSApple OSS Distributions * The linkline must look like this. 43*c54f35caSApple OSS Distributions *.o -lkmodc++ kmod_info.o -lkmod 44*c54f35caSApple OSS Distributions */ 45