X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/8ad349bb6ed4a0be06e34c92be0d98b92e078db4..refs/heads/master:/libkern/kmod/cplus_start.c diff --git a/libkern/kmod/cplus_start.c b/libkern/kmod/cplus_start.c index 577650260..9f23e486c 100644 --- a/libkern/kmod/cplus_start.c +++ b/libkern/kmod/cplus_start.c @@ -1,66 +1,44 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000,2008-2012 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_OSREFERENCE_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. The rights granted to you under the - * License may not be used to create, or enable the creation or - * redistribution of, unlawful or unlicensed copies of an Apple operating - * system, or to circumvent, violate, or enable the circumvention or - * violation of, any terms of an Apple operating system software license - * agreement. + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. + * 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. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * 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 + * 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_OSREFERENCE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* - 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. - - If you do any maintenance on any of the following files make sure great care is taken to keep them in Sync. - KernelModule.bproj/kmod.make - KernelModule.bproj/CreateKModInfo.perl - KernelModule.bproj/kmodc++/pure.c - KernelModule.bproj/kmodc++/cplus_start.c - KernelModule.bproj/kmodc++/cplus_start.c - KernelModule.bproj/kmodc/c_start.c - KernelModule.bproj/kmodc/c_stop.c - - 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. - - The linkline must look like this. - *.o -lkmodc++ kmod_info.o -lkmod + * 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. + * + * If you do any maintenance on any of the following files make sure great care is taken to keep them in Sync. + * KernelModule.bproj/kmod.make + * KernelModule.bproj/CreateKModInfo.perl + * KernelModule.bproj/kmodc++/pure.c + * KernelModule.bproj/kmodc++/cplus_start.c + * KernelModule.bproj/kmodc++/cplus_start.c + * KernelModule.bproj/kmodc/c_start.c + * KernelModule.bproj/kmodc/c_stop.c + * + * 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. + * + * The linkline must look like this. + *.o -lkmodc++ kmod_info.o -lkmod */ -#include - -asm(".constructors_used = 0"); -asm(".private_extern .constructors_used"); - -// This global symbols will be defined by CreateInfo script's info.c file. -extern kmod_start_func_t *_realmain; - -// Functions defined in libkern/c++/OSRuntime.cpp -extern kern_return_t OSRuntimeInitializeCPP(kmod_info_t *ki, void *data); - -__private_extern__ kern_return_t _start(kmod_info_t *ki, void *data) -{ - kern_return_t res = OSRuntimeInitializeCPP(ki, data); - - if (!res && _realmain) - res = (*_realmain)(ki, data); - - return res; -}