src/ld/HeaderAndLoadCommands.hpp

   1 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-*
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   3  * Copyright (c) 2009 Apple Inc. All rights reserved.
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   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
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  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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  24
  25 #ifndef __HEADER_LOAD_COMMANDS_HPP__
  26 #define __HEADER_LOAD_COMMANDS_HPP__
  27
  28 #include <stdlib.h>
  29 #include <limits.h>
  30 #include <unistd.h>
  31 #include <mach-o/loader.h>
  32
  33 #include <vector>
  34
  35 #include "MachOFileAbstraction.hpp"
  36 #include "Options.h"
  37 #include "ld.hpp"
  38
  39 namespace ld {
  40 namespace tool {
  41
  42 class HeaderAndLoadCommandsAbtract : public ld::Atom
  43 {
  44 public:
  45                                                         HeaderAndLoadCommandsAbtract(const ld::Section& sect, ld::Atom::Definition d,
  46                                                                                                 ld::Atom::Combine c, ld::Atom::Scope s, ld::Atom::ContentType ct,
  47                                                                                                 ld::Atom::SymbolTableInclusion i, bool dds, bool thumb, bool al,
  48                                                                                                 ld::Atom::Alignment a) : ld::Atom(sect, d, c, s, ct, i, dds, thumb, al, a) { }
  49
  50         virtual void setUUID(const uint8_t digest[16]) = 0;
  51         virtual void recopyUUIDCommand() = 0;
  52 };
  53
  54 template <typename A>
  55 class HeaderAndLoadCommandsAtom : public HeaderAndLoadCommandsAbtract
  56 {
  57 public:
  58                                                                                                 HeaderAndLoadCommandsAtom(const Options& opts, ld::Internal& state,
  59                                                                                                                                                         OutputFile& writer);
  60
  61         // overrides of ld::Atom
  62         virtual ld::File*                                                       file() const            { return NULL; }
  63         virtual bool                                                            translationUnitSource(const char** dir, const char** nm) const
  64                                                                                                                                         { return false; }
  65         virtual const char*                                                     name() const            { return "mach-o header and load commands"; }
  66         virtual uint64_t                                                        size() const;
  67         virtual uint64_t                                                        objectAddress() const { return _address; }
  68         virtual void                                                            copyRawContent(uint8_t buffer[]) const;
  69
  70         // overrides of HeaderAndLoadCommandsAbtract
  71         virtual void setUUID(const uint8_t digest[16])  { memcpy(_uuid, digest, 16); }
  72         virtual void recopyUUIDCommand();
  73
  74 private:
  75         typedef typename A::P                                           P;
  76         typedef typename A::P::E                                        E;
  77         typedef typename A::P::uint_t                           pint_t;
  78
  79         unsigned int                            nonHiddenSectionCount() const;
  80         unsigned int                            segmentCount() const;
  81         static uint32_t                         alignedSize(uint32_t x);
  82         uint32_t                                        magic() const;
  83         uint32_t                                        cpuType() const;
  84         uint32_t                                        cpuSubType() const;
  85         uint32_t                                        flags() const;
  86         uint32_t                                        fileType() const;
  87         uint32_t                                        commandsCount() const;
  88         uint32_t                                        threadLoadCommandSize() const;
  89         uint8_t*                                        copySingleSegmentLoadCommand(uint8_t* p) const;
  90         uint8_t*                                        copySegmentLoadCommands(uint8_t* p) const;
  91         uint8_t*                                        copyDyldInfoLoadCommand(uint8_t* p) const;
  92         uint8_t*                                        copySymbolTableLoadCommand(uint8_t* p) const;
  93         uint8_t*                                        copyDynamicSymbolTableLoadCommand(uint8_t* p) const;
  94         uint8_t*                                        copyDyldLoadCommand(uint8_t* p) const;
  95         uint8_t*                                        copyDylibIDLoadCommand(uint8_t* p) const;
  96         uint8_t*                                        copyRoutinesLoadCommand(uint8_t* p) const;
  97         uint8_t*                                        copyUUIDLoadCommand(uint8_t* p) const;
  98         uint8_t*                                        copyVersionLoadCommand(uint8_t* p) const;
  99         uint8_t*                                        copyThreadsLoadCommand(uint8_t* p) const;
 100         uint8_t*                                        copyEncryptionLoadCommand(uint8_t* p) const;
 101         uint8_t*                                        copySplitSegInfoLoadCommand(uint8_t* p) const;
 102         uint8_t*                                        copyDylibLoadCommand(uint8_t* p, const ld::dylib::File*) const;
 103         uint8_t*                                        copyRPathLoadCommand(uint8_t* p, const char*) const;
 104         uint8_t*                                        copySubFrameworkLoadCommand(uint8_t* p) const;
 105         uint8_t*                                        copyAllowableClientLoadCommand(uint8_t* p, const char* client) const;
 106         uint8_t*                                        copySubLibraryLoadCommand(uint8_t* p, const char* name) const;
 107         uint8_t*                                        copySubUmbrellaLoadCommand(uint8_t* p, const char* name) const;
 108         uint8_t*                                        copyFunctionStartsLoadCommand(uint8_t* p) const;
 109         uint8_t*                                        copyDyldEnvLoadCommand(uint8_t* p, const char* env) const;
 110
 111         uint32_t                                        sectionFlags(ld::Internal::FinalSection* sect) const;
 112         bool                                            sectionTakesNoDiskSpace(ld::Internal::FinalSection* sect) const;
 113
 114
 115         const Options&                          _options;
 116         ld::Internal&                           _state;
 117         OutputFile&                                     _writer;
 118         pint_t                                          _address;
 119         bool                                            _hasDyldInfoLoadCommand;
 120         bool                                            _hasDyldLoadCommand;
 121         bool                                            _hasDylibIDLoadCommand;
 122         bool                                            _hasThreadLoadCommand;
 123         bool                                            _hasEncryptionLoadCommand;
 124         bool                                            _hasSplitSegInfoLoadCommand;
 125         bool                                            _hasRoutinesLoadCommand;
 126         bool                                            _hasUUIDLoadCommand;
 127         bool                                            _hasSymbolTableLoadCommand;
 128         bool                                            _hasDynamicSymbolTableLoadCommand;
 129         bool                                            _hasRPathLoadCommands;
 130         bool                                            _hasSubFrameworkLoadCommand;
 131         bool                                            _hasVersionLoadCommand;
 132         bool                                            _hasFunctionStartsLoadCommand;
 133         uint32_t                                        _dylibLoadCommmandsCount;
 134         uint32_t                                        _allowableClientLoadCommmandsCount;
 135         uint32_t                                        _dyldEnvironExrasCount;
 136         std::vector<const char*>        _subLibraryNames;
 137         std::vector<const char*>        _subUmbrellaNames;
 138         uint8_t                                         _uuid[16];
 139         mutable macho_uuid_command<P>*  _uuidCmdInOutputBuffer;
 140
 141         static ld::Section                      _s_section;
 142         static ld::Section                      _s_preload_section;
 143 };
 144
 145 template <typename A>
 146 ld::Section HeaderAndLoadCommandsAtom<A>::_s_section("__TEXT", "__mach_header", ld::Section::typeMachHeader, true);
 147 template <typename A>
 148 ld::Section HeaderAndLoadCommandsAtom<A>::_s_preload_section("__HEADER", "__mach_header", ld::Section::typeMachHeader, true);
 149
 150
 151 template <typename A>
 152 HeaderAndLoadCommandsAtom<A>::HeaderAndLoadCommandsAtom(const Options& opts, ld::Internal& state, OutputFile& writer)
 153         : HeaderAndLoadCommandsAbtract((opts.outputKind() == Options::kPreload) ? _s_preload_section : _s_section,
 154                                 ld::Atom::definitionRegular, ld::Atom::combineNever,
 155                                 ld::Atom::scopeTranslationUnit, ld::Atom::typeUnclassified,
 156                                 ld::Atom::symbolTableNotIn, false, false, false,
 157                                 (opts.outputKind() == Options::kPreload) ? ld::Atom::Alignment(0) : ld::Atom::Alignment(12) ),
 158                 _options(opts), _state(state), _writer(writer), _address(0), _uuidCmdInOutputBuffer(NULL)
 159 {
 160         bzero(_uuid, 16);
 161         _hasDyldInfoLoadCommand = opts.makeCompressedDyldInfo();
 162         _hasDyldLoadCommand = ((opts.outputKind() == Options::kDynamicExecutable) || (_options.outputKind() == Options::kDyld));
 163         _hasDylibIDLoadCommand = (opts.outputKind() == Options::kDynamicLibrary);
 164         _hasThreadLoadCommand = _hasDyldLoadCommand || (opts.outputKind() == Options::kStaticExecutable)
 165                                                                                                 || (opts.outputKind() == Options::kPreload)
 166                                                                                                 || (opts.outputKind() == Options::kDyld);
 167         _hasEncryptionLoadCommand = opts.makeEncryptable();
 168         _hasSplitSegInfoLoadCommand = opts.sharedRegionEligible();
 169         _hasRoutinesLoadCommand = (opts.initFunctionName() != NULL);
 170         _hasSymbolTableLoadCommand = true;
 171         _hasUUIDLoadCommand = (opts.UUIDMode() != Options::kUUIDNone);
 172         switch ( opts.outputKind() ) {
 173                 case Options::kDynamicExecutable:
 174                 case Options::kDynamicLibrary:
 175                 case Options::kDynamicBundle:
 176                 case Options::kDyld:
 177                 case Options::kKextBundle:
 178                         _hasDynamicSymbolTableLoadCommand = true;
 179                         break;
 180                 case Options::kObjectFile:
 181                         if ( ! state.someObjectFileHasDwarf )
 182                                 _hasUUIDLoadCommand = false;
 183                         _hasDynamicSymbolTableLoadCommand = false;
 184                         for (std::vector<ld::Internal::FinalSection*>::iterator it = _state.sections.begin(); it != _state.sections.end(); ++it) {
 185                                 if ( (*it)->type() == ld::Section::typeNonLazyPointer ) {
 186                                         _hasDynamicSymbolTableLoadCommand = true;
 187                                         break;
 188                                 }
 189                         }
 190                         break;
 191                 case Options::kStaticExecutable:
 192                         _hasDynamicSymbolTableLoadCommand = false;
 193                         break;
 194                 case Options::kPreload:
 195                         _hasDynamicSymbolTableLoadCommand = opts.positionIndependentExecutable();
 196                         break;
 197         }
 198         _hasRPathLoadCommands = (_options.rpaths().size() != 0);
 199         _hasSubFrameworkLoadCommand = (_options.umbrellaName() != NULL);
 200         _hasVersionLoadCommand = _options.addVersionLoadCommand();
 201         _hasFunctionStartsLoadCommand = _options.addFunctionStarts();
 202         _dylibLoadCommmandsCount = _writer.dylibCount();
 203         _allowableClientLoadCommmandsCount = _options.allowableClients().size();
 204         _dyldEnvironExrasCount = _options.dyldEnvironExtras().size();
 205         if ( ! _options.useSimplifiedDylibReExports() ) {
 206                 // target OS does not support LC_REEXPORT_DYLIB, so use old complicated load commands
 207                 for(uint32_t ord=1; ord <= _writer.dylibCount(); ++ord) {
 208                         const ld::dylib::File* dylib = _writer.dylibByOrdinal(ord);
 209                         if ( dylib->willBeReExported() ) {
 210                                 // if child says it is an sub-framework of the image being created, then nothing to do here
 211                                 bool isSubFramework = false;
 212                                 const char* childInUmbrella = dylib->parentUmbrella();
 213                                 if ( childInUmbrella != NULL ) {
 214                                         const char* myLeaf = strrchr(_options.installPath(), '/');
 215                                         if ( myLeaf != NULL ) {
 216                                                 if ( strcmp(childInUmbrella, &myLeaf[1]) == 0 )
 217                                                         isSubFramework = true;
 218                                         }
 219                                 }
 220                                 // LC_SUB_FRAMEWORK is in child, so do nothing in parent
 221                                 if ( ! isSubFramework ) {
 222                                         // this dylib also needs a sub_x load command
 223                                         bool isFrameworkReExport = false;
 224                                         const char* lastSlash = strrchr(dylib->installPath(), '/');
 225                                         if ( lastSlash != NULL ) {
 226                                                 char frameworkName[strlen(lastSlash)+20];
 227                                                 sprintf(frameworkName, "/%s.framework/", &lastSlash[1]);
 228                                                 isFrameworkReExport = (strstr(dylib->installPath(), frameworkName) != NULL);
 229                                         }
 230                                         if ( isFrameworkReExport ) {
 231                                                 // needs a LC_SUB_UMBRELLA command
 232                                                 _subUmbrellaNames.push_back(&lastSlash[1]);
 233                                         }
 234                                         else {
 235                                                 // needs a LC_SUB_LIBRARY command
 236                                                 const char* nameStart = &lastSlash[1];
 237                                                 if ( lastSlash == NULL )
 238                                                         nameStart = dylib->installPath();
 239                                                 int len = strlen(nameStart);
 240                                                 const char* dot = strchr(nameStart, '.');
 241                                                 if ( dot != NULL )
 242                                                         len = dot - nameStart;
 243                                                 char* subLibName = new char[len+1];
 244                                                 strlcpy(subLibName, nameStart, len+1);
 245                                                 _subLibraryNames.push_back(subLibName);
 246                                         }
 247                                 }
 248                         }
 249                 }
 250         }
 251 }
 252
 253 template <typename A>
 254 uint32_t HeaderAndLoadCommandsAtom<A>::alignedSize(uint32_t size)
 255 {
 256         if ( sizeof(pint_t) == 4 )
 257                 return ((size+3) & (-4));       // 4-byte align all load commands for 32-bit mach-o
 258         else
 259                 return ((size+7) & (-8));       // 8-byte align all load commands for 64-bit mach-o
 260 }
 261
 262
 263 template <typename A>
 264 unsigned int HeaderAndLoadCommandsAtom<A>::nonHiddenSectionCount() const
 265 {
 266         unsigned int count = 0;
 267         for (std::vector<ld::Internal::FinalSection*>::iterator it = _state.sections.begin(); it != _state.sections.end(); ++it) {
 268                 if ( ! (*it)->isSectionHidden() && ((*it)->type() != ld::Section::typeTentativeDefs) )
 269                         ++count;
 270         }
 271         return count;
 272 }
 273
 274 template <typename A>
 275 unsigned int HeaderAndLoadCommandsAtom<A>::segmentCount() const
 276 {
 277         if ( _options.outputKind() == Options::kObjectFile ) {
 278                 // .o files have one anonymous segment that contains all sections
 279                 return 1;
 280         }
 281
 282         unsigned int count = 0;
 283         const char* lastSegName = "";
 284         for (std::vector<ld::Internal::FinalSection*>::iterator it = _state.sections.begin(); it != _state.sections.end(); ++it) {
 285                 if ( _options.outputKind() == Options::kPreload ) {
 286                         if ( (*it)->type() == ld::Section::typeMachHeader )
 287                                 continue; // for -preload, don't put hidden __HEADER segment into output
 288                         if ( (*it)->type() == ld::Section::typeLinkEdit )
 289                                 continue; // for -preload, don't put hidden __LINKEDIT segment into output
 290                 }
 291                 if ( strcmp(lastSegName, (*it)->segmentName()) != 0 ) {
 292                         lastSegName = (*it)->segmentName();
 293                         ++count;
 294                 }
 295         }
 296         return count;
 297 }
 298
 299
 300 template <typename A>
 301 uint64_t HeaderAndLoadCommandsAtom<A>::size() const
 302 {
 303         uint32_t sz = sizeof(macho_header<P>);
 304
 305         sz += sizeof(macho_segment_command<P>) * this->segmentCount();
 306         sz += sizeof(macho_section<P>) * this->nonHiddenSectionCount();
 307
 308         if ( _hasDylibIDLoadCommand )
 309                 sz += alignedSize(sizeof(macho_dylib_command<P>) + strlen(_options.installPath()) + 1);
 310
 311         if ( _hasDyldInfoLoadCommand )
 312                 sz += sizeof(macho_dyld_info_command<P>);
 313
 314         if ( _hasSymbolTableLoadCommand )
 315                 sz += sizeof(macho_symtab_command<P>);
 316
 317         if ( _hasDynamicSymbolTableLoadCommand )
 318                 sz += sizeof(macho_dysymtab_command<P>);
 319
 320         if ( _hasDyldLoadCommand )
 321                 sz += alignedSize(sizeof(macho_dylinker_command<P>) + strlen(_options.dyldInstallPath()) + 1);
 322
 323         if ( _hasRoutinesLoadCommand )
 324                 sz += sizeof(macho_routines_command<P>);
 325
 326         if ( _hasUUIDLoadCommand )
 327                 sz += sizeof(macho_uuid_command<P>);
 328
 329         if ( _hasVersionLoadCommand )
 330                 sz += sizeof(macho_version_min_command<P>);
 331
 332         if ( _hasThreadLoadCommand )
 333                 sz += this->threadLoadCommandSize();
 334
 335         if ( _hasEncryptionLoadCommand )
 336                 sz += sizeof(macho_encryption_info_command<P>);
 337
 338         if ( _hasSplitSegInfoLoadCommand )
 339                 sz += sizeof(macho_linkedit_data_command<P>);
 340
 341         for(uint32_t ord=1; ord <= _writer.dylibCount(); ++ord) {
 342                 sz += alignedSize(sizeof(macho_dylib_command<P>) + strlen(_writer.dylibByOrdinal(ord)->installPath()) + 1);
 343         }
 344
 345         if ( _hasRPathLoadCommands ) {
 346                 const std::vector<const char*>& rpaths = _options.rpaths();
 347                 for (std::vector<const char*>::const_iterator it = rpaths.begin(); it != rpaths.end(); ++it) {
 348                         sz += alignedSize(sizeof(macho_rpath_command<P>) + strlen(*it) + 1);
 349                 }
 350         }
 351
 352         if ( _hasSubFrameworkLoadCommand )
 353                 sz += alignedSize(sizeof(macho_sub_framework_command<P>) + strlen(_options.umbrellaName()) + 1);
 354
 355         for (std::vector<const char*>::const_iterator it = _subLibraryNames.begin(); it != _subLibraryNames.end(); ++it) {
 356                 sz += alignedSize(sizeof(macho_sub_library_command<P>) + strlen(*it) + 1);
 357         }
 358
 359         for (std::vector<const char*>::const_iterator it = _subUmbrellaNames.begin(); it != _subUmbrellaNames.end(); ++it) {
 360                 sz += alignedSize(sizeof(macho_sub_umbrella_command<P>) + strlen(*it) + 1);
 361         }
 362
 363         if ( _allowableClientLoadCommmandsCount != 0 ) {
 364                 const std::vector<const char*>& clients = _options.allowableClients();
 365                 for (std::vector<const char*>::const_iterator it = clients.begin(); it != clients.end(); ++it) {
 366                         sz += alignedSize(sizeof(macho_sub_client_command<P>) + strlen(*it) + 1);
 367                 }
 368         }
 369
 370         if ( _dyldEnvironExrasCount != 0 ) {
 371                 const std::vector<const char*>& extras = _options.dyldEnvironExtras();
 372                 for (std::vector<const char*>::const_iterator it = extras.begin(); it != extras.end(); ++it) {
 373                         sz += alignedSize(sizeof(macho_dylinker_command<P>) + strlen(*it) + 1);
 374                 }
 375         }
 376
 377         if ( _hasFunctionStartsLoadCommand )
 378                 sz += sizeof(macho_linkedit_data_command<P>);
 379
 380         return sz;
 381 }
 382
 383 template <typename A>
 384 uint32_t HeaderAndLoadCommandsAtom<A>::commandsCount() const
 385 {
 386         uint32_t count = this->segmentCount();
 387
 388         if ( _hasDylibIDLoadCommand )
 389                 ++count;
 390
 391         if ( _hasDyldInfoLoadCommand )
 392                 ++count;
 393
 394         if ( _hasSymbolTableLoadCommand )
 395                 ++count;
 396
 397         if ( _hasDynamicSymbolTableLoadCommand )
 398                 ++count;
 399
 400         if ( _hasDyldLoadCommand )
 401                 ++count;
 402
 403         if ( _hasRoutinesLoadCommand )
 404                 ++count;
 405
 406         if ( _hasUUIDLoadCommand )
 407                 ++count;
 408
 409         if ( _hasVersionLoadCommand )
 410                 ++count;
 411
 412         if ( _hasThreadLoadCommand )
 413                 ++count;
 414
 415         if ( _hasEncryptionLoadCommand )
 416                 ++count;
 417
 418         if ( _hasSplitSegInfoLoadCommand )
 419                 ++count;
 420
 421         count += _dylibLoadCommmandsCount;
 422
 423         count += _options.rpaths().size();
 424
 425         if ( _hasSubFrameworkLoadCommand )
 426                 ++count;
 427
 428         count += _subLibraryNames.size();
 429
 430         count += _subUmbrellaNames.size();
 431
 432         count += _allowableClientLoadCommmandsCount;
 433
 434         count += _dyldEnvironExrasCount;
 435
 436         if ( _hasFunctionStartsLoadCommand )
 437                 ++count;
 438
 439         return count;
 440 }
 441
 442 template <typename A>
 443 uint32_t HeaderAndLoadCommandsAtom<A>::fileType() const
 444 {
 445         switch ( _options.outputKind() ) {
 446                 case Options::kDynamicExecutable:
 447                 case Options::kStaticExecutable:
 448                         return MH_EXECUTE;
 449                 case Options::kDynamicLibrary:
 450                         return MH_DYLIB;
 451                 case Options::kDynamicBundle:
 452                         return MH_BUNDLE;
 453                 case Options::kObjectFile:
 454                         return MH_OBJECT;
 455                 case Options::kDyld:
 456                         return MH_DYLINKER;
 457                 case Options::kPreload:
 458                         return MH_PRELOAD;
 459                 case Options::kKextBundle:
 460                         return MH_KEXT_BUNDLE;
 461         }
 462         throw "unknonwn mach-o file type";
 463 }
 464
 465 template <typename A>
 466 uint32_t HeaderAndLoadCommandsAtom<A>::flags() const
 467 {
 468         uint32_t bits = 0;
 469         if ( _options.outputKind() == Options::kObjectFile ) {
 470                 if ( _state.allObjectFilesScatterable )
 471                         bits = MH_SUBSECTIONS_VIA_SYMBOLS;
 472         }
 473         else {
 474                 if ( _options.outputKind() == Options::kStaticExecutable ) {
 475                         bits |= MH_NOUNDEFS;
 476                 }
 477                 else if ( _options.outputKind() == Options::kPreload ) {
 478                         bits |= MH_NOUNDEFS;
 479                         if ( _options.positionIndependentExecutable() )
 480                                 bits |= MH_PIE;
 481                 }
 482                 else {
 483                         bits = MH_DYLDLINK;
 484                         switch ( _options.nameSpace() ) {
 485                                 case Options::kTwoLevelNameSpace:
 486                                         bits |= MH_TWOLEVEL | MH_NOUNDEFS;
 487                                         break;
 488                                 case Options::kFlatNameSpace:
 489                                         break;
 490                                 case Options::kForceFlatNameSpace:
 491                                         bits |= MH_FORCE_FLAT;
 492                                         break;
 493                         }
 494                         if ( _writer.hasWeakExternalSymbols || _writer.overridesWeakExternalSymbols )
 495                                 bits |= MH_WEAK_DEFINES;
 496                         if ( _writer.usesWeakExternalSymbols || _writer.hasWeakExternalSymbols )
 497                                 bits |= MH_BINDS_TO_WEAK;
 498                         if ( _options.prebind() )
 499                                 bits |= MH_PREBOUND;
 500                         if ( _options.splitSeg() )
 501                                 bits |= MH_SPLIT_SEGS;
 502                         if ( (_options.outputKind() == Options::kDynamicLibrary)
 503                                         && _writer._noReExportedDylibs
 504                                         && _options.useSimplifiedDylibReExports() ) {
 505                                 bits |= MH_NO_REEXPORTED_DYLIBS;
 506                         }
 507                         if ( _options.positionIndependentExecutable() && ! _writer.pieDisabled )
 508                                 bits |= MH_PIE;
 509                         if ( _options.markAutoDeadStripDylib() )
 510                                 bits |= MH_DEAD_STRIPPABLE_DYLIB;
 511                         if ( _writer.hasThreadLocalVariableDefinitions )
 512                                 bits |= MH_HAS_TLV_DESCRIPTORS;
 513                         if ( _options.hasNonExecutableHeap() )
 514                                 bits |= MH_NO_HEAP_EXECUTION;
 515                 }
 516                 if ( _options.hasExecutableStack() )
 517                         bits |= MH_ALLOW_STACK_EXECUTION;
 518         }
 519         return bits;
 520 }
 521
 522 template <> uint32_t HeaderAndLoadCommandsAtom<x86>::magic() const              { return MH_MAGIC; }
 523 template <> uint32_t HeaderAndLoadCommandsAtom<x86_64>::magic() const   { return MH_MAGIC_64; }
 524 template <> uint32_t HeaderAndLoadCommandsAtom<arm>::magic() const              { return MH_MAGIC; }
 525
 526 template <> uint32_t HeaderAndLoadCommandsAtom<x86>::cpuType() const    { return CPU_TYPE_I386; }
 527 template <> uint32_t HeaderAndLoadCommandsAtom<x86_64>::cpuType() const { return CPU_TYPE_X86_64; }
 528 template <> uint32_t HeaderAndLoadCommandsAtom<arm>::cpuType() const    { return CPU_TYPE_ARM; }
 529
 530
 531
 532 template <>
 533 uint32_t HeaderAndLoadCommandsAtom<x86>::cpuSubType() const
 534 {
 535         return CPU_SUBTYPE_I386_ALL;
 536 }
 537
 538 template <>
 539 uint32_t HeaderAndLoadCommandsAtom<x86_64>::cpuSubType() const
 540 {
 541         if ( (_options.outputKind() == Options::kDynamicExecutable) && (_options.macosxVersionMin() >= ld::mac10_5) )
 542                 return (CPU_SUBTYPE_X86_64_ALL | 0x80000000);
 543         else
 544                 return CPU_SUBTYPE_X86_64_ALL;
 545 }
 546
 547 template <>
 548 uint32_t HeaderAndLoadCommandsAtom<arm>::cpuSubType() const
 549 {
 550         return _state.cpuSubType;
 551 }
 552
 553
 554
 555 template <typename A>
 556 uint8_t* HeaderAndLoadCommandsAtom<A>::copySingleSegmentLoadCommand(uint8_t* p) const
 557 {
 558         // in .o files there is just one segment load command with a blank name
 559         // and all sections under it
 560         macho_segment_command<P>* cmd = (macho_segment_command<P>*)p;
 561         cmd->set_cmd(macho_segment_command<P>::CMD);
 562         cmd->set_segname("");
 563         cmd->set_vmaddr(_options.baseAddress());
 564         cmd->set_vmsize(0);             // updated after sections set
 565         cmd->set_fileoff(0);    // updated after sections set
 566         cmd->set_filesize(0);   // updated after sections set
 567         cmd->set_maxprot(VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE);
 568         cmd->set_initprot(VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE);
 569         cmd->set_nsects(this->nonHiddenSectionCount());
 570         cmd->set_flags(0);
 571         // add sections array
 572         macho_section<P>* msect = (macho_section<P>*)&p[sizeof(macho_segment_command<P>)];
 573         for (std::vector<ld::Internal::FinalSection*>::iterator sit = _state.sections.begin(); sit != _state.sections.end(); ++sit)  {
 574                 ld::Internal::FinalSection* fsect = *sit;
 575                 if ( fsect->isSectionHidden() )
 576                         continue;
 577                 if ( fsect->type() == ld::Section::typeTentativeDefs )
 578                         continue;
 579                 msect->set_sectname(fsect->sectionName());
 580                 msect->set_segname(fsect->segmentName());
 581                 msect->set_addr(fsect->address);
 582                 msect->set_size(fsect->size);
 583                 msect->set_offset(fsect->fileOffset);
 584                 msect->set_align(fsect->alignment);
 585                 msect->set_reloff((fsect->relocCount == 0) ? 0 : _writer.sectionRelocationsSection->fileOffset + fsect->relocStart * sizeof(macho_relocation_info<P>));
 586                 msect->set_nreloc(fsect->relocCount);
 587                 msect->set_flags(sectionFlags(fsect));
 588                 msect->set_reserved1(fsect->indirectSymTabStartIndex);
 589                 msect->set_reserved2(fsect->indirectSymTabElementSize);
 590                 // update segment info
 591                 if ( cmd->fileoff() == 0 )
 592                         cmd->set_fileoff(fsect->fileOffset);
 593                 cmd->set_vmsize(fsect->address + fsect->size - cmd->vmaddr());
 594                 if ( (fsect->type() != ld::Section::typeZeroFill) && (fsect->type() != ld::Section::typeTentativeDefs) )
 595                         cmd->set_filesize(fsect->fileOffset + fsect->size - cmd->fileoff());
 596                 ++msect;
 597         }
 598         cmd->set_cmdsize(sizeof(macho_segment_command<P>) + cmd->nsects()*sizeof(macho_section<P>));
 599         return p + cmd->cmdsize();
 600 }
 601
 602 struct SegInfo {
 603                                                                                                 SegInfo(const char* n, const Options&);
 604         const char*                                                                     segName;
 605         uint32_t                                                                        nonHiddenSectionCount;
 606         uint32_t                                                                        maxProt;
 607         uint32_t                                                                        initProt;
 608         std::vector<ld::Internal::FinalSection*>        sections;
 609 };
 610
 611
 612 SegInfo::SegInfo(const char* n, const Options& opts)
 613         : segName(n), nonHiddenSectionCount(0), maxProt(opts.maxSegProtection(n)), initProt(opts.initialSegProtection(n))
 614 {
 615 }
 616
 617
 618 template <typename A>
 619 uint32_t HeaderAndLoadCommandsAtom<A>::sectionFlags(ld::Internal::FinalSection* sect) const
 620 {
 621         uint32_t bits;
 622         switch ( sect->type() ) {
 623                 case ld::Section::typeUnclassified:
 624                         if ( strcmp(sect->segmentName(), "__OBJC") == 0 )
 625                                 return S_REGULAR | S_ATTR_NO_DEAD_STRIP;
 626                         else if ( (strcmp(sect->sectionName(), "__objc_classlist") == 0) && (strcmp(sect->segmentName(), "__DATA") == 0) )
 627                                 return S_REGULAR | S_ATTR_NO_DEAD_STRIP;
 628                         else if ( (strcmp(sect->sectionName(), "__objc_catlist") == 0) && (strcmp(sect->segmentName(), "__DATA") == 0) )
 629                                 return S_REGULAR | S_ATTR_NO_DEAD_STRIP;
 630                         else if ( (strncmp(sect->sectionName(), "__objc_superrefs", 16) == 0) && (strcmp(sect->segmentName(), "__DATA") == 0) )
 631                                 return S_REGULAR | S_ATTR_NO_DEAD_STRIP;
 632                         else if ( (strncmp(sect->sectionName(), "__objc_nlclslist", 16) == 0) && (strcmp(sect->segmentName(), "__DATA") == 0) )
 633                                 return S_REGULAR | S_ATTR_NO_DEAD_STRIP;
 634                         else
 635                                 return S_REGULAR;
 636                 case ld::Section::typeCode:
 637                         bits = S_REGULAR | S_ATTR_SOME_INSTRUCTIONS | S_ATTR_PURE_INSTRUCTIONS;
 638                         if ( sect->hasLocalRelocs && ! _writer.pieDisabled )
 639                                 bits |= S_ATTR_LOC_RELOC;
 640                         if ( sect->hasExternalRelocs )
 641                                 bits |= S_ATTR_EXT_RELOC;
 642                         return bits;
 643                 case ld::Section::typePageZero:
 644                         return S_REGULAR;
 645                 case ld::Section::typeImportProxies:
 646                         return S_REGULAR;
 647                 case ld::Section::typeLinkEdit:
 648                         return S_REGULAR;
 649                 case ld::Section::typeMachHeader:
 650                         return S_REGULAR;
 651                 case ld::Section::typeStack:
 652                         return S_REGULAR;
 653                 case ld::Section::typeLiteral4:
 654                         return S_4BYTE_LITERALS;
 655                 case ld::Section::typeLiteral8:
 656                         return S_8BYTE_LITERALS;
 657                 case ld::Section::typeLiteral16:
 658                         return S_16BYTE_LITERALS;
 659                 case ld::Section::typeConstants:
 660                         return S_REGULAR;
 661                 case ld::Section::typeTempLTO:
 662                         assert(0 && "typeTempLTO should not make it to final linked image");
 663                         return S_REGULAR;
 664                 case ld::Section::typeAbsoluteSymbols:
 665                         assert(0 && "typeAbsoluteSymbols should not make it to final linked image");
 666                         return S_REGULAR;
 667                 case ld::Section::typeCString:
 668                 case ld::Section::typeNonStdCString:
 669                         return S_CSTRING_LITERALS;
 670                 case ld::Section::typeCStringPointer:
 671                         return S_LITERAL_POINTERS | S_ATTR_NO_DEAD_STRIP;
 672                 case ld::Section::typeUTF16Strings:
 673                         return S_REGULAR;
 674                 case ld::Section::typeCFString:
 675                         return S_REGULAR;
 676                 case ld::Section::typeObjC1Classes:
 677                         return S_REGULAR | S_ATTR_NO_DEAD_STRIP;
 678                 case ld::Section::typeCFI:
 679                         return S_REGULAR;
 680                 case ld::Section::typeLSDA:
 681                         return S_REGULAR;
 682                 case ld::Section::typeDtraceDOF:
 683                         return S_DTRACE_DOF;
 684                 case ld::Section::typeUnwindInfo:
 685                         return S_REGULAR;
 686                 case ld::Section::typeObjCClassRefs:
 687                 case ld::Section::typeObjC2CategoryList:
 688                         return S_REGULAR | S_ATTR_NO_DEAD_STRIP;
 689                 case ld::Section::typeZeroFill:
 690                         if ( _options.optimizeZeroFill() )
 691                                 return S_ZEROFILL;
 692                         else
 693                                 return S_REGULAR;
 694                 case ld::Section::typeTentativeDefs:
 695                         assert(0 && "typeTentativeDefs should not make it to final linked image");
 696                         return S_REGULAR;
 697                 case ld::Section::typeLazyPointer:
 698                 case ld::Section::typeLazyPointerClose:
 699                         return S_LAZY_SYMBOL_POINTERS;
 700                 case ld::Section::typeStubClose:
 701                 case ld::Section::typeStub:
 702                         if ( sect->hasLocalRelocs )
 703                                 return S_SYMBOL_STUBS | S_ATTR_SOME_INSTRUCTIONS | S_ATTR_PURE_INSTRUCTIONS | S_ATTR_LOC_RELOC;
 704                         else
 705                                 return S_SYMBOL_STUBS | S_ATTR_SOME_INSTRUCTIONS | S_ATTR_PURE_INSTRUCTIONS;
 706                 case ld::Section::typeNonLazyPointer:
 707                         return S_NON_LAZY_SYMBOL_POINTERS;
 708                 case ld::Section::typeDyldInfo:
 709                         return S_REGULAR;
 710                 case ld::Section::typeLazyDylibPointer:
 711                         return S_LAZY_DYLIB_SYMBOL_POINTERS;
 712                 case ld::Section::typeStubHelper:
 713                         if ( sect->hasLocalRelocs )
 714                                 return S_REGULAR | S_ATTR_SOME_INSTRUCTIONS | S_ATTR_PURE_INSTRUCTIONS | S_ATTR_LOC_RELOC;
 715                         else
 716                                 return S_REGULAR | S_ATTR_SOME_INSTRUCTIONS | S_ATTR_PURE_INSTRUCTIONS;
 717                 case ld::Section::typeInitializerPointers:
 718                         return S_MOD_INIT_FUNC_POINTERS;
 719                 case ld::Section::typeTerminatorPointers:
 720                         return S_MOD_TERM_FUNC_POINTERS;
 721                 case ld::Section::typeTLVInitialValues:
 722                         return S_THREAD_LOCAL_REGULAR;
 723                 case ld::Section::typeTLVZeroFill:
 724                         return S_THREAD_LOCAL_ZEROFILL;
 725                 case ld::Section::typeTLVDefs:
 726                         return S_THREAD_LOCAL_VARIABLES;
 727                 case ld::Section::typeTLVInitializerPointers:
 728                         return S_THREAD_LOCAL_INIT_FUNCTION_POINTERS;
 729                 case ld::Section::typeTLVPointers:
 730                         return S_THREAD_LOCAL_VARIABLE_POINTERS;
 731                 case ld::Section::typeFirstSection:
 732                         assert(0 && "typeFirstSection should not make it to final linked image");
 733                         return S_REGULAR;
 734                 case ld::Section::typeLastSection:
 735                         assert(0 && "typeLastSection should not make it to final linked image");
 736                         return S_REGULAR;
 737                 case ld::Section::typeDebug:
 738                         return S_REGULAR | S_ATTR_DEBUG;
 739         }
 740         return S_REGULAR;
 741 }
 742
 743
 744 template <typename A>
 745 bool HeaderAndLoadCommandsAtom<A>::sectionTakesNoDiskSpace(ld::Internal::FinalSection* sect) const
 746 {
 747         switch ( sect->type() ) {
 748                 case ld::Section::typeZeroFill:
 749                 case ld::Section::typeTLVZeroFill:
 750                         return _options.optimizeZeroFill();
 751                 case ld::Section::typeAbsoluteSymbols:
 752                 case ld::Section::typeTentativeDefs:
 753                 case ld::Section::typeLastSection:
 754                         return true;
 755                 default:
 756                         break;
 757         }
 758         return false;
 759 }
 760
 761
 762 template <typename A>
 763 uint8_t* HeaderAndLoadCommandsAtom<A>::copySegmentLoadCommands(uint8_t* p) const
 764 {
 765         // group sections into segments
 766         std::vector<SegInfo> segs;
 767         const char* lastSegName = "";
 768         for (std::vector<ld::Internal::FinalSection*>::iterator it = _state.sections.begin(); it != _state.sections.end(); ++it) {
 769                 ld::Internal::FinalSection* sect = *it;
 770                 if ( _options.outputKind() == Options::kPreload ) {
 771                         if ( (*it)->type() == ld::Section::typeMachHeader )
 772                                 continue; // for -preload, don't put hidden __HEADER segment into output
 773                         if ( (*it)->type() == ld::Section::typeLinkEdit )
 774                                 continue; // for -preload, don't put hidden __LINKEDIT segment into output
 775                 }
 776                 if ( strcmp(lastSegName, sect->segmentName()) != 0 ) {
 777                         SegInfo si(sect->segmentName(), _options);
 778                         segs.push_back(si);
 779                         lastSegName = sect->segmentName();
 780                 }
 781                 if ( ! sect->isSectionHidden() )
 782                         segs.back().nonHiddenSectionCount++;
 783                 segs.back().sections.push_back(sect);
 784         }
 785         // write out segment load commands for each section with trailing sections
 786         for (std::vector<SegInfo>::iterator it = segs.begin(); it != segs.end(); ++it) {
 787                 SegInfo& si = *it;
 788                 ld::Internal::FinalSection* lastNonZeroFillSection = NULL;
 789                 for (int i=si.sections.size()-1; i >= 0; --i) {
 790                         if ( !sectionTakesNoDiskSpace(si.sections[i]) ) {
 791                                 lastNonZeroFillSection = si.sections[i];
 792                                 break;
 793                         }
 794                 }
 795                 uint64_t vmsize = si.sections.back()->address + si.sections.back()->size - si.sections.front()->address;
 796                 vmsize = ((vmsize+_options.segmentAlignment()-1) & (-_options.segmentAlignment()));
 797                 uint64_t filesize = 0;
 798                 if ( lastNonZeroFillSection != NULL ) {
 799                         filesize = lastNonZeroFillSection->address + lastNonZeroFillSection->size - si.sections.front()->address;
 800                         // round up all segments to page aligned, except __LINKEDIT
 801                         if ( (si.sections[0]->type() != ld::Section::typeLinkEdit) && (si.sections[0]->type() != ld::Section::typeImportProxies) )
 802                                 filesize = (filesize + _options.segmentAlignment()-1) & (-_options.segmentAlignment());
 803                 }
 804                 if ( si.sections.front()->type() == ld::Section::typePageZero )
 805                         filesize = 0;
 806                 else if ( si.sections.front()->type() == ld::Section::typeStack )
 807                         filesize = 0;
 808                 macho_segment_command<P>* segCmd = (macho_segment_command<P>*)p;
 809                 segCmd->set_cmd(macho_segment_command<P>::CMD);
 810                 segCmd->set_cmdsize(sizeof(macho_segment_command<P>) + si.nonHiddenSectionCount*sizeof(macho_section<P>));
 811                 segCmd->set_segname(si.sections.front()->segmentName());
 812                 segCmd->set_vmaddr(si.sections.front()->address);
 813                 segCmd->set_vmsize(vmsize);
 814                 segCmd->set_fileoff(si.sections.front()->fileOffset);
 815                 segCmd->set_filesize(filesize);
 816                 segCmd->set_maxprot(si.maxProt);
 817                 segCmd->set_initprot(si.initProt);
 818                 segCmd->set_nsects(si.nonHiddenSectionCount);
 819                 segCmd->set_flags(0);
 820                 p += sizeof(macho_segment_command<P>);
 821                 macho_section<P>* msect = (macho_section<P>*)p;
 822                 for (std::vector<ld::Internal::FinalSection*>::iterator sit = si.sections.begin(); sit != si.sections.end(); ++sit) {
 823                         ld::Internal::FinalSection* fsect = *sit;
 824                         if ( ! fsect->isSectionHidden() ) {
 825                                 msect->set_sectname(fsect->sectionName());
 826                                 msect->set_segname(fsect->segmentName());
 827                                 msect->set_addr(fsect->address);
 828                                 msect->set_size(fsect->size);
 829                                 msect->set_offset(sectionTakesNoDiskSpace(fsect) ? 0 : fsect->fileOffset);
 830                                 msect->set_align(fsect->alignment);
 831                                 msect->set_reloff(0);
 832                                 msect->set_nreloc(0);
 833                                 msect->set_flags(sectionFlags(fsect));
 834                                 msect->set_reserved1(fsect->indirectSymTabStartIndex);
 835                                 msect->set_reserved2(fsect->indirectSymTabElementSize);
 836                                 p += sizeof(macho_section<P>);
 837                                 ++msect;
 838                         }
 839                 }
 840         }
 841
 842         return p;
 843 }
 844
 845
 846 template <typename A>
 847 uint8_t* HeaderAndLoadCommandsAtom<A>::copySymbolTableLoadCommand(uint8_t* p) const
 848 {
 849         // build LC_SYMTAB command
 850         macho_symtab_command<P>*   symbolTableCmd = (macho_symtab_command<P>*)p;
 851         symbolTableCmd->set_cmd(LC_SYMTAB);
 852         symbolTableCmd->set_cmdsize(sizeof(macho_symtab_command<P>));
 853         symbolTableCmd->set_nsyms(_writer.symbolTableSection->size/sizeof(macho_nlist<P>));
 854         symbolTableCmd->set_symoff(_writer.symbolTableSection->size == 0 ? 0 : _writer.symbolTableSection->fileOffset);
 855         symbolTableCmd->set_stroff(_writer.stringPoolSection->size == 0 ? 0 : _writer.stringPoolSection->fileOffset );
 856         symbolTableCmd->set_strsize(_writer.stringPoolSection->size);
 857         return p + sizeof(macho_symtab_command<P>);
 858 }
 859
 860 template <typename A>
 861 uint8_t* HeaderAndLoadCommandsAtom<A>::copyDynamicSymbolTableLoadCommand(uint8_t* p) const
 862 {
 863         // build LC_SYMTAB command
 864         macho_dysymtab_command<P>*   dynamicSymbolTableCmd = (macho_dysymtab_command<P>*)p;
 865         dynamicSymbolTableCmd->set_cmd(LC_DYSYMTAB);
 866         dynamicSymbolTableCmd->set_cmdsize(sizeof(macho_dysymtab_command<P>));
 867         dynamicSymbolTableCmd->set_ilocalsym(0);
 868         dynamicSymbolTableCmd->set_nlocalsym(_writer._localSymbolsCount);
 869         dynamicSymbolTableCmd->set_iextdefsym(dynamicSymbolTableCmd->ilocalsym()+dynamicSymbolTableCmd->nlocalsym());
 870         dynamicSymbolTableCmd->set_nextdefsym(_writer._globalSymbolsCount);
 871         dynamicSymbolTableCmd->set_iundefsym(dynamicSymbolTableCmd->iextdefsym()+dynamicSymbolTableCmd->nextdefsym());
 872         dynamicSymbolTableCmd->set_nundefsym(_writer._importSymbolsCount);
 873
 874         // FIX ME: support for 10.3 dylibs which need modules
 875         //if ( fWriter.fModuleInfoAtom != NULL ) {
 876         //      dynamicSymbolTableCmd->set_tocoff(fWriter.fModuleInfoAtom->getTableOfContentsFileOffset());
 877         //      dynamicSymbolTableCmd->set_ntoc(fWriter.fSymbolTableExportCount);
 878         //      dynamicSymbolTableCmd->set_modtaboff(fWriter.fModuleInfoAtom->getModuleTableFileOffset());
 879         //      dynamicSymbolTableCmd->set_nmodtab(1);
 880         //      dynamicSymbolTableCmd->set_extrefsymoff(fWriter.fModuleInfoAtom->getReferencesFileOffset());
 881         //      dynamicSymbolTableCmd->set_nextrefsyms(fWriter.fModuleInfoAtom->getReferencesCount());
 882         //}
 883
 884         bool hasIndirectSymbols = ( (_writer.indirectSymbolTableSection != NULL) && (_writer.indirectSymbolTableSection->size != 0) );
 885         dynamicSymbolTableCmd->set_indirectsymoff(hasIndirectSymbols ? _writer.indirectSymbolTableSection->fileOffset : 0);
 886         dynamicSymbolTableCmd->set_nindirectsyms( hasIndirectSymbols ? _writer.indirectSymbolTableSection->size/sizeof(uint32_t) : 0);
 887
 888         // FIX ME: support for classic relocations
 889         if ( _options.outputKind() != Options::kObjectFile ) {
 890                 bool hasExternalRelocs = ( (_writer.externalRelocationsSection != NULL) && (_writer.externalRelocationsSection->size != 0) );
 891                 dynamicSymbolTableCmd->set_extreloff(hasExternalRelocs ? _writer.externalRelocationsSection->fileOffset : 0);
 892                 dynamicSymbolTableCmd->set_nextrel(  hasExternalRelocs ? _writer.externalRelocationsSection->size/8 : 0);
 893                 bool hasLocalRelocs = ( (_writer.localRelocationsSection != NULL) && (_writer.localRelocationsSection->size != 0) );
 894                 dynamicSymbolTableCmd->set_locreloff(hasLocalRelocs ? _writer.localRelocationsSection->fileOffset : 0);
 895                 dynamicSymbolTableCmd->set_nlocrel  (hasLocalRelocs ? _writer.localRelocationsSection->size/8 : 0);
 896         }
 897         return p + sizeof(macho_dysymtab_command<P>);
 898 }
 899
 900
 901 template <typename A>
 902 uint8_t* HeaderAndLoadCommandsAtom<A>::copyDyldInfoLoadCommand(uint8_t* p) const
 903 {
 904         // build LC_DYLD_INFO command
 905         macho_dyld_info_command<P>*  cmd = (macho_dyld_info_command<P>*)p;
 906
 907         cmd->set_cmd(LC_DYLD_INFO_ONLY);
 908         cmd->set_cmdsize(sizeof(macho_dyld_info_command<P>));
 909         if ( _writer.rebaseSection->size != 0 ) {
 910                 cmd->set_rebase_off(_writer.rebaseSection->fileOffset);
 911                 cmd->set_rebase_size(_writer.rebaseSection->size);
 912         }
 913         if ( _writer.bindingSection->size != 0 ) {
 914                 cmd->set_bind_off(_writer.bindingSection->fileOffset);
 915                 cmd->set_bind_size(_writer.bindingSection->size);
 916         }
 917         if ( _writer.weakBindingSection->size != 0 ) {
 918                 cmd->set_weak_bind_off(_writer.weakBindingSection->fileOffset);
 919                 cmd->set_weak_bind_size(_writer.weakBindingSection->size);
 920         }
 921         if ( _writer.lazyBindingSection->size != 0 ) {
 922                 cmd->set_lazy_bind_off(_writer.lazyBindingSection->fileOffset);
 923                 cmd->set_lazy_bind_size(_writer.lazyBindingSection->size);
 924         }
 925         if ( _writer.exportSection->size != 0 ) {
 926                 cmd->set_export_off(_writer.exportSection->fileOffset);
 927                 cmd->set_export_size(_writer.exportSection->size);
 928         }
 929         return p + sizeof(macho_dyld_info_command<P>);
 930 }
 931
 932
 933 template <typename A>
 934 uint8_t* HeaderAndLoadCommandsAtom<A>::copyDyldLoadCommand(uint8_t* p) const
 935 {
 936         uint32_t sz = alignedSize(sizeof(macho_dylinker_command<P>) + strlen(_options.dyldInstallPath()) + 1);
 937         macho_dylinker_command<P>* cmd = (macho_dylinker_command<P>*)p;
 938         if ( _options.outputKind() == Options::kDyld )
 939                 cmd->set_cmd(LC_ID_DYLINKER);
 940         else
 941                 cmd->set_cmd(LC_LOAD_DYLINKER);
 942         cmd->set_cmdsize(sz);
 943         cmd->set_name_offset();
 944         strcpy((char*)&p[sizeof(macho_dylinker_command<P>)], _options.dyldInstallPath());
 945         return p + sz;
 946 }
 947
 948
 949 template <typename A>
 950 uint8_t* HeaderAndLoadCommandsAtom<A>::copyDylibIDLoadCommand(uint8_t* p) const
 951 {
 952         uint32_t sz = alignedSize(sizeof(macho_dylib_command<P>) + strlen(_options.installPath()) + 1);
 953         macho_dylib_command<P>* cmd = (macho_dylib_command<P>*)p;
 954         cmd->set_cmd(LC_ID_DYLIB);
 955         cmd->set_cmdsize(sz);
 956         cmd->set_name_offset();
 957         cmd->set_timestamp(1);  // needs to be some constant value that is different than DylibLoadCommandsAtom uses
 958         cmd->set_current_version(_options.currentVersion32());
 959         cmd->set_compatibility_version(_options.compatibilityVersion());
 960         strcpy((char*)&p[sizeof(macho_dylib_command<P>)], _options.installPath());
 961         return p + sz;
 962 }
 963
 964 template <typename A>
 965 uint8_t* HeaderAndLoadCommandsAtom<A>::copyRoutinesLoadCommand(uint8_t* p) const
 966 {
 967         pint_t initAddr = _state.entryPoint->finalAddress();
 968         if ( _state.entryPoint->isThumb() )
 969                 initAddr |= 1ULL;
 970         macho_routines_command<P>* cmd = (macho_routines_command<P>*)p;
 971         cmd->set_cmd(macho_routines_command<P>::CMD);
 972         cmd->set_cmdsize(sizeof(macho_routines_command<P>));
 973         cmd->set_init_address(initAddr);
 974         return p + sizeof(macho_routines_command<P>);
 975 }
 976
 977
 978 template <typename A>
 979 void HeaderAndLoadCommandsAtom<A>::recopyUUIDCommand()
 980 {
 981         assert(_uuidCmdInOutputBuffer != NULL);
 982         _uuidCmdInOutputBuffer->set_uuid(_uuid);
 983 }
 984
 985
 986 template <typename A>
 987 uint8_t* HeaderAndLoadCommandsAtom<A>::copyUUIDLoadCommand(uint8_t* p) const
 988 {
 989         macho_uuid_command<P>* cmd = (macho_uuid_command<P>*)p;
 990         cmd->set_cmd(LC_UUID);
 991         cmd->set_cmdsize(sizeof(macho_uuid_command<P>));
 992         cmd->set_uuid(_uuid);
 993         _uuidCmdInOutputBuffer = cmd;    // save for later re-write by recopyUUIDCommand()
 994         return p + sizeof(macho_uuid_command<P>);
 995 }
 996
 997
 998 template <typename A>
 999 uint8_t* HeaderAndLoadCommandsAtom<A>::copyVersionLoadCommand(uint8_t* p) const
1000 {
1001         macho_version_min_command<P>* cmd = (macho_version_min_command<P>*)p;
1002         ld::MacVersionMin macVersion = _options.macosxVersionMin();
1003         ld::IOSVersionMin iOSVersion = _options.iOSVersionMin();
1004         assert( (macVersion != ld::macVersionUnset) || (iOSVersion != ld::iOSVersionUnset) );
1005         if ( macVersion != ld::macVersionUnset ) {
1006                 cmd->set_cmd(LC_VERSION_MIN_MACOSX);
1007                 cmd->set_cmdsize(sizeof(macho_version_min_command<P>));
1008                 cmd->set_version((uint32_t)macVersion);
1009                 cmd->set_sdk(0);
1010         }
1011         else {
1012                 cmd->set_cmd(LC_VERSION_MIN_IPHONEOS);
1013                 cmd->set_cmdsize(sizeof(macho_version_min_command<P>));
1014                 cmd->set_version((uint32_t)iOSVersion);
1015                 cmd->set_sdk(0);
1016         }
1017         return p + sizeof(macho_version_min_command<P>);
1018 }
1019
1020
1021
1022 template <>
1023 uint32_t HeaderAndLoadCommandsAtom<x86>::threadLoadCommandSize() const
1024 {
1025         return this->alignedSize(16 + 16*4);    // base size + i386_THREAD_STATE_COUNT * 4
1026 }
1027
1028 template <>
1029 uint8_t* HeaderAndLoadCommandsAtom<x86>::copyThreadsLoadCommand(uint8_t* p) const
1030 {
1031         assert(_state.entryPoint != NULL);
1032         pint_t start = _state.entryPoint->finalAddress();
1033         macho_thread_command<P>* cmd = (macho_thread_command<P>*)p;
1034         cmd->set_cmd(LC_UNIXTHREAD);
1035         cmd->set_cmdsize(threadLoadCommandSize());
1036         cmd->set_flavor(1);                             // i386_THREAD_STATE
1037         cmd->set_count(16);                             // i386_THREAD_STATE_COUNT;
1038         cmd->set_thread_register(10, start);
1039         if ( _options.hasCustomStack() )
1040                 cmd->set_thread_register(7, _options.customStackAddr());        // r1
1041         return p + threadLoadCommandSize();
1042 }
1043
1044 template <>
1045 uint32_t HeaderAndLoadCommandsAtom<x86_64>::threadLoadCommandSize() const
1046 {
1047         return this->alignedSize(16 + x86_THREAD_STATE64_COUNT * 4);
1048 }
1049
1050 template <>
1051 uint8_t* HeaderAndLoadCommandsAtom<x86_64>::copyThreadsLoadCommand(uint8_t* p) const
1052 {
1053         assert(_state.entryPoint != NULL);
1054         pint_t start = _state.entryPoint->finalAddress();
1055         macho_thread_command<P>* cmd = (macho_thread_command<P>*)p;
1056         cmd->set_cmd(LC_UNIXTHREAD);
1057         cmd->set_cmdsize(threadLoadCommandSize());
1058         cmd->set_flavor(x86_THREAD_STATE64);
1059         cmd->set_count(x86_THREAD_STATE64_COUNT);
1060         cmd->set_thread_register(16, start);            // rip
1061         if ( _options.hasCustomStack() )
1062                 cmd->set_thread_register(7, _options.customStackAddr());        // r1
1063         return p + threadLoadCommandSize();
1064 }
1065
1066 template <>
1067 uint32_t HeaderAndLoadCommandsAtom<arm>::threadLoadCommandSize() const
1068 {
1069         return this->alignedSize(16 + 17 * 4); // base size + ARM_THREAD_STATE_COUNT * 4
1070 }
1071
1072 template <>
1073 uint8_t* HeaderAndLoadCommandsAtom<arm>::copyThreadsLoadCommand(uint8_t* p) const
1074 {
1075         assert(_state.entryPoint != NULL);
1076         pint_t start = _state.entryPoint->finalAddress();
1077         if ( _state.entryPoint->isThumb() )
1078                 start |= 1ULL;
1079         macho_thread_command<P>* cmd = (macho_thread_command<P>*)p;
1080         cmd->set_cmd(LC_UNIXTHREAD);
1081         cmd->set_cmdsize(threadLoadCommandSize());
1082         cmd->set_flavor(1);
1083         cmd->set_count(17);
1084         cmd->set_thread_register(15, start);            // pc
1085         if ( _options.hasCustomStack() )
1086                 cmd->set_thread_register(13, _options.customStackAddr());       // sp
1087         return p + threadLoadCommandSize();
1088 }
1089
1090 template <typename A>
1091 uint8_t* HeaderAndLoadCommandsAtom<A>::copyEncryptionLoadCommand(uint8_t* p) const
1092 {
1093         macho_encryption_info_command<P>* cmd = (macho_encryption_info_command<P>*)p;
1094         cmd->set_cmd(LC_ENCRYPTION_INFO);
1095         cmd->set_cmdsize(sizeof(macho_encryption_info_command<P>));
1096         assert(_writer.encryptedTextStartOffset() != 0);
1097         assert(_writer.encryptedTextEndOffset() != 0);
1098         cmd->set_cryptoff(_writer.encryptedTextStartOffset());
1099         cmd->set_cryptsize(_writer.encryptedTextEndOffset()-_writer.encryptedTextStartOffset());
1100         cmd->set_cryptid(0);
1101         return p + sizeof(macho_encryption_info_command<P>);
1102 }
1103
1104
1105 template <typename A>
1106 uint8_t* HeaderAndLoadCommandsAtom<A>::copySplitSegInfoLoadCommand(uint8_t* p) const
1107 {
1108         macho_linkedit_data_command<P>* cmd = (macho_linkedit_data_command<P>*)p;
1109         cmd->set_cmd(LC_SEGMENT_SPLIT_INFO);
1110         cmd->set_cmdsize(sizeof(macho_linkedit_data_command<P>));
1111         cmd->set_dataoff(_writer.splitSegInfoSection->fileOffset);
1112         cmd->set_datasize(_writer.splitSegInfoSection->size);
1113         return p + sizeof(macho_linkedit_data_command<P>);
1114 }
1115
1116
1117 template <typename A>
1118 uint8_t* HeaderAndLoadCommandsAtom<A>::copyDylibLoadCommand(uint8_t* p, const ld::dylib::File* dylib) const
1119 {
1120         uint32_t sz = alignedSize(sizeof(macho_dylib_command<P>) + strlen(dylib->installPath()) + 1);
1121         macho_dylib_command<P>* cmd = (macho_dylib_command<P>*)p;
1122         if ( dylib->willBeLazyLoadedDylib() )
1123                 cmd->set_cmd(LC_LAZY_LOAD_DYLIB);
1124         else if ( dylib->forcedWeakLinked() || dylib->allSymbolsAreWeakImported() )
1125                 cmd->set_cmd(LC_LOAD_WEAK_DYLIB);
1126         else if ( dylib->willBeReExported() && _options.useSimplifiedDylibReExports() )
1127                 cmd->set_cmd(LC_REEXPORT_DYLIB);
1128         else if ( dylib->willBeUpwardDylib() && _options.useUpwardDylibs() )
1129                 cmd->set_cmd(LC_LOAD_UPWARD_DYLIB);
1130         else
1131                 cmd->set_cmd(LC_LOAD_DYLIB);
1132         cmd->set_cmdsize(sz);
1133         cmd->set_timestamp(2);  // needs to be some constant value that is different than DylibIDLoadCommandsAtom uses
1134         cmd->set_current_version(dylib->currentVersion());
1135         cmd->set_compatibility_version(dylib->compatibilityVersion());
1136         cmd->set_name_offset();
1137         strcpy((char*)&p[sizeof(macho_dylib_command<P>)], dylib->installPath());
1138         return p + sz;
1139 }
1140
1141 template <typename A>
1142 uint8_t* HeaderAndLoadCommandsAtom<A>::copyRPathLoadCommand(uint8_t* p, const char* path) const
1143 {
1144         uint32_t sz = alignedSize(sizeof(macho_rpath_command<P>) + strlen(path) + 1);
1145         macho_rpath_command<P>* cmd = (macho_rpath_command<P>*)p;
1146         cmd->set_cmd(LC_RPATH);
1147         cmd->set_cmdsize(sz);
1148         cmd->set_path_offset();
1149         strcpy((char*)&p[sizeof(macho_rpath_command<P>)], path);
1150         return p + sz;
1151 }
1152
1153 template <typename A>
1154 uint8_t* HeaderAndLoadCommandsAtom<A>::copySubFrameworkLoadCommand(uint8_t* p) const
1155 {
1156         const char* umbrellaName = _options.umbrellaName();
1157         uint32_t sz = alignedSize(sizeof(macho_sub_framework_command<P>) + strlen(umbrellaName) + 1);
1158         macho_sub_framework_command<P>* cmd = (macho_sub_framework_command<P>*)p;
1159         cmd->set_cmd(LC_SUB_FRAMEWORK);
1160         cmd->set_cmdsize(sz);
1161         cmd->set_umbrella_offset();
1162         strcpy((char*)&p[sizeof(macho_sub_framework_command<P>)], umbrellaName);
1163         return p + sz;
1164 }
1165
1166
1167 template <typename A>
1168 uint8_t* HeaderAndLoadCommandsAtom<A>::copyAllowableClientLoadCommand(uint8_t* p, const char* client) const
1169 {
1170         uint32_t sz = alignedSize(sizeof(macho_sub_client_command<P>) + strlen(client) + 1);
1171         macho_sub_client_command<P>* cmd = (macho_sub_client_command<P>*)p;
1172         cmd->set_cmd(LC_SUB_CLIENT);
1173         cmd->set_cmdsize(sz);
1174         cmd->set_client_offset();
1175         strcpy((char*)&p[sizeof(macho_sub_client_command<P>)], client);
1176         return p + sz;
1177 }
1178
1179 template <typename A>
1180 uint8_t* HeaderAndLoadCommandsAtom<A>::copyDyldEnvLoadCommand(uint8_t* p, const char* env) const
1181 {
1182         uint32_t sz = alignedSize(sizeof(macho_dylinker_command<P>) + strlen(env) + 1);
1183         macho_dylinker_command<P>* cmd = (macho_dylinker_command<P>*)p;
1184         cmd->set_cmd(LC_DYLD_ENVIRONMENT);
1185         cmd->set_cmdsize(sz);
1186         cmd->set_name_offset();
1187         strcpy((char*)&p[sizeof(macho_dylinker_command<P>)], env);
1188         return p + sz;
1189 }
1190
1191 template <typename A>
1192 uint8_t* HeaderAndLoadCommandsAtom<A>::copySubUmbrellaLoadCommand(uint8_t* p, const char* nm) const
1193 {
1194         uint32_t sz = alignedSize(sizeof(macho_sub_umbrella_command<P>) + strlen(nm) + 1);
1195         macho_sub_umbrella_command<P>* cmd = (macho_sub_umbrella_command<P>*)p;
1196         cmd->set_cmd(LC_SUB_UMBRELLA);
1197         cmd->set_cmdsize(sz);
1198         cmd->set_sub_umbrella_offset();
1199         strcpy((char*)&p[sizeof(macho_sub_umbrella_command<P>)], nm);
1200         return p + sz;
1201 }
1202
1203 template <typename A>
1204 uint8_t* HeaderAndLoadCommandsAtom<A>::copySubLibraryLoadCommand(uint8_t* p, const char* nm) const
1205 {
1206         uint32_t sz = alignedSize(sizeof(macho_sub_library_command<P>) + strlen(nm) + 1);
1207         macho_sub_library_command<P>* cmd = (macho_sub_library_command<P>*)p;
1208         cmd->set_cmd(LC_SUB_LIBRARY);
1209         cmd->set_cmdsize(sz);
1210         cmd->set_sub_library_offset();
1211         strcpy((char*)&p[sizeof(macho_sub_library_command<P>)], nm);
1212         return p + sz;
1213 }
1214
1215 template <typename A>
1216 uint8_t* HeaderAndLoadCommandsAtom<A>::copyFunctionStartsLoadCommand(uint8_t* p) const
1217 {
1218         macho_linkedit_data_command<P>* cmd = (macho_linkedit_data_command<P>*)p;
1219         cmd->set_cmd(LC_FUNCTION_STARTS);
1220         cmd->set_cmdsize(sizeof(macho_linkedit_data_command<P>));
1221         cmd->set_dataoff(_writer.functionStartsSection->fileOffset);
1222         cmd->set_datasize(_writer.functionStartsSection->size);
1223         return p + sizeof(macho_linkedit_data_command<P>);
1224 }
1225
1226
1227 template <typename A>
1228 void HeaderAndLoadCommandsAtom<A>::copyRawContent(uint8_t buffer[]) const
1229 {
1230         macho_header<P>* mh = (macho_header<P>*)buffer;
1231         bzero(buffer, this->size());
1232
1233         // copy mach_header
1234         mh->set_magic(this->magic());
1235         mh->set_cputype(this->cpuType());
1236         mh->set_cpusubtype(this->cpuSubType());
1237         mh->set_filetype(this->fileType());
1238         mh->set_ncmds(this->commandsCount());
1239         mh->set_sizeofcmds(this->size()-sizeof(macho_header<P>));
1240         mh->set_flags(this->flags());
1241
1242         // copy load commands
1243         uint8_t* p = &buffer[sizeof(macho_header<P>)];
1244
1245         if ( _options.outputKind() == Options::kObjectFile )
1246                 p = this->copySingleSegmentLoadCommand(p);
1247         else
1248                 p = this->copySegmentLoadCommands(p);
1249
1250         if ( _hasDylibIDLoadCommand )
1251                 p = this->copyDylibIDLoadCommand(p);
1252
1253         if ( _hasDyldInfoLoadCommand )
1254                 p = this->copyDyldInfoLoadCommand(p);
1255
1256         if ( _hasSymbolTableLoadCommand )
1257                 p = this->copySymbolTableLoadCommand(p);
1258
1259         if ( _hasDynamicSymbolTableLoadCommand )
1260                 p = this->copyDynamicSymbolTableLoadCommand(p);
1261
1262         if ( _hasDyldLoadCommand )
1263                 p = this->copyDyldLoadCommand(p);
1264
1265         if ( _hasRoutinesLoadCommand )
1266                 p = this->copyRoutinesLoadCommand(p);
1267
1268         if ( _hasUUIDLoadCommand )
1269                 p = this->copyUUIDLoadCommand(p);
1270
1271         if ( _hasVersionLoadCommand )
1272                 p = this->copyVersionLoadCommand(p);
1273
1274         if ( _hasThreadLoadCommand )
1275                 p = this->copyThreadsLoadCommand(p);
1276
1277         if ( _hasEncryptionLoadCommand )
1278                 p = this->copyEncryptionLoadCommand(p);
1279
1280         if ( _hasSplitSegInfoLoadCommand )
1281                 p = this->copySplitSegInfoLoadCommand(p);
1282
1283         for(uint32_t ord=1; ord <= _writer.dylibCount(); ++ord) {
1284                 p = this->copyDylibLoadCommand(p, _writer.dylibByOrdinal(ord));
1285         }
1286
1287         if ( _hasRPathLoadCommands ) {
1288                 const std::vector<const char*>& rpaths = _options.rpaths();
1289                 for (std::vector<const char*>::const_iterator it = rpaths.begin(); it != rpaths.end(); ++it) {
1290                         p = this->copyRPathLoadCommand(p, *it);
1291                 }
1292         }
1293
1294         if ( _hasSubFrameworkLoadCommand )
1295                 p = this->copySubFrameworkLoadCommand(p);
1296
1297         for (std::vector<const char*>::const_iterator it = _subLibraryNames.begin(); it != _subLibraryNames.end(); ++it) {
1298                 p = this->copySubLibraryLoadCommand(p, *it);
1299         }
1300
1301         for (std::vector<const char*>::const_iterator it = _subUmbrellaNames.begin(); it != _subUmbrellaNames.end(); ++it) {
1302                 p = this->copySubUmbrellaLoadCommand(p, *it);
1303         }
1304
1305         if ( _allowableClientLoadCommmandsCount != 0 ) {
1306                 const std::vector<const char*>& clients = _options.allowableClients();
1307                 for (std::vector<const char*>::const_iterator it = clients.begin(); it != clients.end(); ++it) {
1308                         p = this->copyAllowableClientLoadCommand(p, *it);
1309                 }
1310         }
1311
1312         if ( _dyldEnvironExrasCount != 0 ) {
1313                 const std::vector<const char*>& extras = _options.dyldEnvironExtras();
1314                 for (std::vector<const char*>::const_iterator it = extras.begin(); it != extras.end(); ++it) {
1315                         p = this->copyDyldEnvLoadCommand(p, *it);
1316                 }
1317         }
1318
1319         if ( _hasFunctionStartsLoadCommand )
1320                 p = this->copyFunctionStartsLoadCommand(p);
1321
1322 }
1323
1324
1325
1326 } // namespace tool
1327 } // namespace ld
1328
1329 #endif // __HEADER_LOAD_COMMANDS_HPP__