1/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*- 2 * 3 * Copyright (c) 2009-2010 Apple Inc. All rights reserved. 4 * 5 * @APPLE_LICENSE_HEADER_START@ 6 * 7 * This file contains Original Code and/or Modifications of Original Code 8 * as defined in and that are subject to the Apple Public Source License 9 * Version 2.0 (the 'License'). You may not use this file except in 10 * compliance with the License. Please obtain a copy of the License at 11 * http://www.opensource.apple.com/apsl/ and read it before using this 12 * file. 13 * 14 * The Original Code and all software distributed under the License are 15 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 19 * Please see the License for the specific language governing rights and 20 * limitations under the License. 21 * 22 * @APPLE_LICENSE_HEADER_END@ 23 */ 24 25#include <Availability.h> 26#include <stddef.h> 27#include <TargetConditionals.h> 28 29 30// 31// This is the temporary private interface between libSystem.B.dylib and dyld 32// 33 34 35int NXArgc = 0; 36const char** NXArgv = NULL; 37const char** environ = NULL; 38const char* __progname = NULL; 39 40 41 42// 43// Long ago, the compiler driver added -ldylib1.o to every dylib which caused a 44// __DATA,__dyld section to be added every dylib. The new LINKEDIT format no longer requires 45// images to have a __DATA,__dyld section. But until libdyld.dylib and dyld update 46// to some sort of vtable based interface, libdyld still needs a __DATA,__dyld section. 47// The code below adds that section. 48// 49struct __DATA__dyld { 50 long lazy; 51 int (*lookup)(const char*, void**); 52 // ProgramVars 53 const void* mh; 54 int* NXArgcPtr; 55 const char*** NXArgvPtr; 56 const char*** environPtr; 57 const char** __prognamePtr; 58}; 59 60static volatile struct __DATA__dyld myDyldSection __attribute__ ((section ("__DATA,__dyld"))) 61 = { 0, 0, NULL, &NXArgc, &NXArgv, &environ, &__progname }; 62 63#if __arm__ && __MAC_OS_X_VERSION_MIN_REQUIRED 64// <rdar://problem/8755380> 65// For historical reasons, gcc and llvm-gcc added -ldylib1.o to the link line of armv6 66// dylibs when targeting MacOSX (but not iOS). clang cleans up that mistake, but doing 67// so would break the libdyld build. Making _dyld_func_lookup weak,hidden means if 68// dylib1.o is used, it overrides this, otherwise this implementation is used. 69__attribute__((weak)) 70#endif 71__attribute__((visibility("hidden"))) 72int _dyld_func_lookup(const char* dyld_func_name, void **address) 73{ 74 return (*myDyldSection.lookup)(dyld_func_name, address); 75} 76 77