dyld3/libdyldEntryVector.cpp

   1 /*
   2  * Copyright (c) 2017 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <stdarg.h>
  25
  26 #include "dyld_priv.h"
  27 #include "libdyldEntryVector.h"
  28 #include "AllImages.h"
  29 #include "Array.h"
  30 #include "Loading.h"
  31 #include "Logging.h"
  32 #include "PathOverrides.h"
  33 #include "StartGlue.h"
  34 #include "dyld_process_info_internal.h"
  35
  36 extern "C" char start;
  37
  38 VIS_HIDDEN const char** appleParams;
  39
  40 extern bool gUseDyld3;
  41
  42 namespace dyld3 {
  43
  44
  45 AllImages::ProgramVars sVars;
  46 static void (*sChildForkFunction)();
  47
  48 static const char* leafName(const char* argv0)
  49 {
  50     if ( argv0 == nullptr )
  51        return "";
  52
  53     if ( const char* lastSlash = strrchr(argv0, '/') )
  54         return lastSlash+1;
  55     else
  56         return argv0;
  57 }
  58
  59 static void entry_setVars(const mach_header* mainMH, int argc, const char* argv[], const char* envp[], const char* apple[])
  60 {
  61     NXArgc       = argc;
  62     NXArgv       = argv;
  63     environ      = (char**)envp;
  64     appleParams  = apple;
  65     __progname   = leafName(argv[0]);
  66
  67     sVars.mh            = mainMH;
  68     sVars.NXArgcPtr     = &NXArgc;
  69     sVars.NXArgvPtr     = &NXArgv;
  70     sVars.environPtr    = (const char***)&environ;
  71     sVars.__prognamePtr = &__progname;
  72     gAllImages.setProgramVars(&sVars);
  73
  74     gUseDyld3 = true;
  75
  76     setLoggingFromEnvs(envp);
  77 }
  78
  79 static void entry_setHaltFunction(void (*func)(const char* message) __attribute__((noreturn)) )
  80 {
  81     setHaltFunction(func);
  82 }
  83
  84 static void entry_setLogFunction(void (*logFunction)(const char* format, va_list list))
  85 {
  86     setLoggingFunction(logFunction);
  87 }
  88
  89 static void entry_setOldAllImageInfo(dyld_all_image_infos* old)
  90 {
  91     gAllImages.setOldAllImageInfo(old);
  92 }
  93
  94 static void entry_setNotifyMonitoringDyldMain(void (*notifyMonitoringDyldMain)()) {
  95     setNotifyMonitoringDyldMain(notifyMonitoringDyldMain);
  96 }
  97
  98 static void entry_setNotifyMonitoringDyld(void (*notifyMonitoringDyld)(bool unloading,unsigned imageCount,
  99                                                                                const struct mach_header* loadAddresses[],
 100                                                                                const char* imagePaths[])) {
 101     setNotifyMonitoringDyld(notifyMonitoringDyld);
 102 }
 103
 104 static void entry_setInitialImageList(const closure::LaunchClosure* closure,
 105                                 const DyldSharedCache* dyldCacheLoadAddress, const char* dyldCachePath,
 106                                 const Array<LoadedImage>& initialImages, const LoadedImage& libSystem)
 107 {
 108     gAllImages.init(closure, dyldCacheLoadAddress, dyldCachePath, initialImages);
 109     gAllImages.applyInterposingToDyldCache(closure);
 110
 111     const char* mainPath = _simple_getenv(appleParams, "executable_path");
 112     if ( (mainPath != nullptr) && (mainPath[0] == '/') )
 113         gAllImages.setMainPath(mainPath);
 114
 115     // run initializer for libSytem.B.dylib
 116     // this calls back into _dyld_initializer which calls gAllIimages.addImages()
 117     gAllImages.runLibSystemInitializer(libSystem);
 118
 119     // now that malloc is available, parse DYLD_ env vars
 120     closure::gPathOverrides.setEnvVars((const char**)environ, gAllImages.mainExecutable(), gAllImages.mainExecutableImage()->path());
 121 }
 122
 123 static void entry_runInitialzersBottomUp(const mach_header* mainExecutableImageLoadAddress)
 124 {
 125     gAllImages.runStartupInitialzers();
 126     gAllImages.notifyMonitorMain();
 127 }
 128
 129 static void entry_setChildForkFunction(void (*func)() )
 130 {
 131     sChildForkFunction = func;
 132 }
 133
 134 static void entry_setRestrictions(bool allowAtPaths, bool allowEnvPaths)
 135 {
 136     gAllImages.setRestrictions(allowAtPaths, allowEnvPaths);
 137 }
 138
 139 const LibDyldEntryVector entryVectorForDyld = {
 140     LibDyldEntryVector::kCurrentVectorVersion,
 141     closure::kFormatVersion,
 142     &entry_setVars,
 143     &entry_setHaltFunction,
 144     &entry_setOldAllImageInfo,
 145     &entry_setInitialImageList,
 146     &entry_runInitialzersBottomUp,
 147     (__typeof(LibDyldEntryVector::startFunc))address_of_start,
 148     &entry_setChildForkFunction,
 149     &entry_setLogFunction,
 150     &entry_setRestrictions,
 151     &entry_setNotifyMonitoringDyldMain,
 152     &entry_setNotifyMonitoringDyld
 153 };
 154
 155 VIS_HIDDEN void _dyld_fork_child()
 156 {
 157     (*sChildForkFunction)();
 158 }
 159
 160
 161 } // namespace dyld3
 162