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1 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
2 *
3 * Copyright (c) 2004-2007 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
26 #ifndef __IMAGELOADER__
27 #define __IMAGELOADER__
28
29 #include <sys/types.h>
30 #include <mach/mach_time.h> // struct mach_timebase_info
31 #include <mach/mach_init.h> // struct mach_thread_self
32 #include <stdint.h>
33 #include <vector>
34 #include <set>
35
36 #include "mach-o/dyld_images.h"
37 #include "mach-o/dyld_priv.h"
38
39
40 #define SPLIT_SEG_SHARED_REGION_SUPPORT 0
41 #define SPLIT_SEG_DYLIB_SUPPORT (__ppc__ || __i386__)
42 #define TEXT_RELOC_SUPPORT (__ppc__ || __i386__)
43 #define DYLD_SHARED_CACHE_SUPPORT (__ppc__ || __i386__ || __ppc64__ || __x86_64__)
44 #define IMAGE_NOTIFY_SUPPORT 0
45 #define RECURSIVE_INITIALIZER_LOCK 1
46 #define SUPPORT_OLD_CRT_INITIALIZATION (__ppc__ || __i386__)
47
48
49 // utilities
50 namespace dyld {
51 extern __attribute__((noreturn)) void throwf(const char* format, ...) __attribute__((format(printf, 1, 2)));
52 extern void log(const char* format, ...) __attribute__((format(printf, 1, 2)));
53 extern void warn(const char* format, ...) __attribute__((format(printf, 1, 2)));
54 extern const char* mkstringf(const char* format, ...) __attribute__((format(printf, 1, 2)));
55 };
56
57
58 struct ProgramVars
59 {
60 const void* mh;
61 int* NXArgcPtr;
62 const char*** NXArgvPtr;
63 const char*** environPtr;
64 const char** __prognamePtr;
65 };
66
67
68
69 //
70 // ImageLoader is an abstract base class. To support loading a particular executable
71 // file format, you make a concrete subclass of ImageLoader.
72 //
73 // For each executable file (dynamic shared object) in use, an ImageLoader is instantiated.
74 //
75 // The ImageLoader base class does the work of linking together images, but it knows nothing
76 // about any particular file format.
77 //
78 //
79 class ImageLoader {
80 public:
81
82 typedef uint32_t DefinitionFlags;
83 static const DefinitionFlags kNoDefinitionOptions = 0;
84 static const DefinitionFlags kWeakDefinition = 1;
85
86 typedef uint32_t ReferenceFlags;
87 static const ReferenceFlags kNoReferenceOptions = 0;
88 static const ReferenceFlags kWeakReference = 1;
89 static const ReferenceFlags kTentativeDefinition = 2;
90
91 enum PrebindMode { kUseAllPrebinding, kUseSplitSegPrebinding, kUseAllButAppPredbinding, kUseNoPrebinding };
92 enum BindingOptions { kBindingNone, kBindingLazyPointers, kBindingNeverSetLazyPointers };
93 enum SharedRegionMode { kUseSharedRegion, kUsePrivateSharedRegion, kDontUseSharedRegion, kSharedRegionIsSharedCache };
94
95 struct Symbol; // abstact symbol
96
97 struct MappedRegion {
98 uintptr_t address;
99 size_t size;
100 };
101
102 struct RPathChain {
103 RPathChain(const RPathChain* n, std::vector<const char*>* p) : next(n), paths(p) {};
104 const RPathChain* next;
105 std::vector<const char*>* paths;
106 };
107
108 struct DOFInfo {
109 void* dof;
110 const mach_header* imageHeader;
111 const char* imageShortName;
112 };
113
114 struct LinkContext {
115 ImageLoader* (*loadLibrary)(const char* libraryName, bool search, bool findDLL, const char* origin, const RPathChain* rpaths);
116 void (*terminationRecorder)(ImageLoader* image);
117 bool (*flatExportFinder)(const char* name, const Symbol** sym, const ImageLoader** image);
118 bool (*coalescedExportFinder)(const char* name, const Symbol** sym, const ImageLoader** image);
119 void (*undefinedHandler)(const char* name);
120 #if IMAGE_NOTIFY_SUPPORT
121 void (*addImageNeedingNotification)(ImageLoader* image);
122 void (*notifyAdding)(const ImageLoader* const * images, unsigned int count);
123 #endif
124 MappedRegion* (*getAllMappedRegions)(MappedRegion*);
125 void * (*bindingHandler)(const char *, const char *, void *);
126 void (*notifySingle)(dyld_image_states, const struct mach_header*, const char* path, time_t modDate);
127 void (*notifyBatch)(dyld_image_states state);
128 void (*removeImage)(ImageLoader* image);
129 void (*registerDOFs)(const std::vector<DOFInfo>& dofs);
130 void (*clearAllDepths)();
131 unsigned int (*imageCount)();
132 void (*notifySharedCacheInvalid)();
133 #if __i386__
134 void (*makeSharedCacheImportSegmentsWritable)(bool writable);
135 #endif
136 void (*setNewProgramVars)(const ProgramVars&);
137 #if SUPPORT_OLD_CRT_INITIALIZATION
138 void (*setRunInitialzersOldWay)();
139 #endif
140 BindingOptions bindingOptions;
141 int argc;
142 const char** argv;
143 const char** envp;
144 const char** apple;
145 const char* progname;
146 ProgramVars programVars;
147 ImageLoader* mainExecutable;
148 const char* imageSuffix;
149 PrebindMode prebindUsage;
150 SharedRegionMode sharedRegionMode;
151 bool dyldLoadedAtSameAddressNeededBySharedCache;
152 bool preFetchDisabled;
153 bool prebinding;
154 bool bindFlat;
155 bool linkingMainExecutable;
156 bool verboseOpts;
157 bool verboseEnv;
158 bool verboseMapping;
159 bool verboseRebase;
160 bool verboseBind;
161 bool verboseInit;
162 bool verboseDOF;
163 bool verbosePrebinding;
164 bool verboseWarnings;
165 };
166
167 // constructor is protected, but anyone can delete an image
168 virtual ~ImageLoader();
169
170 // link() takes a newly instantiated ImageLoader and does all
171 // fixups needed to make it usable by the process
172 void link(const LinkContext& context, bool forceLazysBound, bool preflight, const RPathChain& loaderRPaths);
173
174 // runInitializers() is normally called in link() but the main executable must
175 // run crt code before initializers
176 void runInitializers(const LinkContext& context);
177
178 // called after link() forces all lazy pointers to be bound
179 void bindAllLazyPointers(const LinkContext& context, bool recursive);
180
181 // used by dyld to see if a requested library is already loaded (might be symlink)
182 bool statMatch(const struct stat& stat_buf) const;
183
184 // get short name of this image
185 const char* getShortName() const;
186
187 // get path used to load this image, not necessarily the "real" path
188 const char* getPath() const { return fPath; }
189
190 uint32_t getPathHash() const { return fPathHash; }
191
192 // get path used to load this image represents (ZeroLink only) which image this .o is part of
193 const char* getLogicalPath() const;
194
195 // get path this image is intended to be placed on disk or NULL if no preferred install location
196 virtual const char* getInstallPath() const = 0;
197
198 // image was loaded with NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME and all clients are looking for install path
199 bool matchInstallPath() const;
200 void setMatchInstallPath(bool);
201
202 // if path was a fat file, offset of image loaded in that fat file
203 uint64_t getOffsetInFatFile() const;
204
205 // mark that this image's exported symbols should be ignored when linking other images (e.g. RTLD_LOCAL)
206 void setHideExports(bool hide = true);
207
208 // check if this image's exported symbols should be ignored when linking other images
209 bool hasHiddenExports() const;
210
211 // checks if this image is already linked into the process
212 bool isLinked() const;
213
214 // even if image is deleted, leave segments mapped in
215 void setLeaveMapped();
216
217 // even if image is deleted, leave segments mapped in
218 bool leaveMapped() { return fLeaveMapped; }
219
220 // checks if the specifed address is within one of this image's segments
221 virtual bool containsAddress(const void* addr) const;
222
223 // checks if the specifed address range overlaps any of this image's segments
224 virtual bool overlapsWithAddressRange(const void* start, const void* end) const;
225
226 // adds to list of ranges of memory mapped in
227 void getMappedRegions(MappedRegion*& region) const;
228
229 // st_mtime from stat() on file
230 time_t lastModified() const;
231
232 // only valid for main executables, returns a pointer its entry point
233 virtual void* getMain() const = 0;
234
235 // dyld API's require each image to have an associated mach_header
236 virtual const struct mach_header* machHeader() const = 0;
237
238 // dyld API's require each image to have a slide (actual load address minus preferred load address)
239 virtual uintptr_t getSlide() const = 0;
240
241 // last address mapped by image
242 virtual const void* getEnd() const = 0;
243
244 // image has exports that participate in runtime coalescing
245 virtual bool hasCoalescedExports() const = 0;
246
247 // search symbol table of definitions in this image for requested name
248 virtual const Symbol* findExportedSymbol(const char* name, const void* hint, bool searchReExports, const ImageLoader** foundIn) const = 0;
249
250 // gets address of implementation (code) of the specified exported symbol
251 virtual uintptr_t getExportedSymbolAddress(const Symbol* sym, const LinkContext& context, const ImageLoader* requestor=NULL) const = 0;
252
253 // gets attributes of the specified exported symbol
254 virtual DefinitionFlags getExportedSymbolInfo(const Symbol* sym) const = 0;
255
256 // gets name of the specified exported symbol
257 virtual const char* getExportedSymbolName(const Symbol* sym) const = 0;
258
259 // gets how many symbols are exported by this image
260 virtual uint32_t getExportedSymbolCount() const = 0;
261
262 // gets the i'th exported symbol
263 virtual const Symbol* getIndexedExportedSymbol(uint32_t index) const = 0;
264
265 // find exported symbol as if imported by this image
266 // used by RTLD_NEXT
267 virtual const Symbol* findExportedSymbolInDependentImages(const char* name, const LinkContext& context, const ImageLoader** foundIn) const;
268
269 // find exported symbol as if imported by this image
270 // used by RTLD_SELF
271 virtual const Symbol* findExportedSymbolInImageOrDependentImages(const char* name, const LinkContext& context, const ImageLoader** foundIn) const;
272
273 // gets how many symbols are imported by this image
274 virtual uint32_t getImportedSymbolCount() const = 0;
275
276 // gets the i'th imported symbol
277 virtual const Symbol* getIndexedImportedSymbol(uint32_t index) const = 0;
278
279 // gets attributes of the specified imported symbol
280 virtual ReferenceFlags geImportedSymbolInfo(const Symbol* sym) const = 0;
281
282 // gets name of the specified imported symbol
283 virtual const char* getImportedSymbolName(const Symbol* sym) const = 0;
284
285 // checks if this image is a bundle and can be loaded but not linked
286 virtual bool isBundle() const = 0;
287
288 // checks if this image is a dylib
289 virtual bool isDylib() const = 0;
290
291 // only for main executable
292 virtual bool forceFlat() const = 0;
293
294 // called at runtime when a lazily bound function is first called
295 virtual uintptr_t doBindLazySymbol(uintptr_t* lazyPointer, const LinkContext& context) = 0;
296
297 // calls termination routines (e.g. C++ static destructors for image)
298 virtual void doTermination(const LinkContext& context) = 0;
299
300 #if IMAGE_NOTIFY_SUPPORT
301 // tell this image about other images
302 virtual void doNotification(enum dyld_image_mode mode, uint32_t infoCount, const struct dyld_image_info info[]) = 0;
303 #endif
304 // return if this image has initialization routines
305 virtual bool needsInitialization() = 0;
306
307 #if IMAGE_NOTIFY_SUPPORT
308 // return if this image has a routine to be called when any image is loaded or unloaded
309 virtual bool hasImageNotification() = 0;
310 #endif
311 // return if this image has specified section and set start and length
312 virtual bool getSectionContent(const char* segmentName, const char* sectionName, void** start, size_t* length) = 0;
313
314 // given a pointer into an image, find which segment and section it is in
315 virtual bool findSection(const void* imageInterior, const char** segmentName, const char** sectionName, size_t* sectionOffset) = 0;
316
317 // the image supports being prebound
318 virtual bool isPrebindable() const = 0;
319
320 // the image is prebindable and its prebinding is valid
321 virtual bool usablePrebinding(const LinkContext& context) const = 0;
322
323 // add all RPATH paths this image contains
324 virtual void getRPaths(const LinkContext& context, std::vector<const char*>&) const = 0;
325
326
327
328 dyld_image_states getState() { return (dyld_image_states)fState; }
329
330 // used to sort images bottom-up
331 int compare(const ImageLoader* right) const;
332
333 void incrementDlopenReferenceCount() { ++fDlopenReferenceCount; }
334
335 bool decrementDlopenReferenceCount();
336
337 void printReferenceCounts();
338
339 uint32_t referenceCount() const { return fDlopenReferenceCount + fStaticReferenceCount + fDynamicReferenceCount; }
340
341 bool neverUnload() const { return fNeverUnload; }
342
343 void setNeverUnload() { fNeverUnload = true; fLeaveMapped = true; }
344
345 // triggered by DYLD_PRINT_STATISTICS to write info on work done and how fast
346 static void printStatistics(unsigned int imageCount);
347
348 // used with DYLD_IMAGE_SUFFIX
349 static void addSuffix(const char* path, const char* suffix, char* result);
350
351 static uint32_t hash(const char*);
352
353 void setPath(const char* path); // only called for images created from memory
354 void setPathUnowned(const char* path);
355
356 void setLogicalPath(const char* path);
357
358 void clearDepth() { fDepth = 0; }
359
360 void setBeingRemoved() { fBeingRemoved = true; }
361 bool isBeingRemoved() const { return fBeingRemoved; }
362
363
364 protected:
365 struct DependentLibrary;
366 public:
367 friend class iterator;
368
369 class iterator
370 {
371 public:
372 iterator& operator++() { ++fLocation; return *this; }
373 bool operator!=(const iterator& it) const { return (it.fLocation != this->fLocation); }
374 ImageLoader* operator*() const { return fLocation->image; }
375 private:
376 friend class ImageLoader;
377 iterator(DependentLibrary* loc) : fLocation(loc) {}
378 DependentLibrary* fLocation;
379 };
380
381 iterator beginDependents() { return iterator(fLibraries); }
382 iterator endDependents() { return iterator(&fLibraries[fLibrariesCount]); }
383
384
385
386 friend class Segment;
387
388 protected:
389 // abstract base class so all constructors protected
390 ImageLoader(const char* path, uint64_t offsetInFat, const struct stat& info);
391 ImageLoader(const char* moduleName);
392 ImageLoader(const ImageLoader&);
393 void operator=(const ImageLoader&);
394
395
396 struct LibraryInfo {
397 uint32_t checksum;
398 uint32_t minVersion;
399 uint32_t maxVersion;
400 };
401
402 struct DependentLibrary {
403 ImageLoader* image;
404 uint32_t required : 1,
405 checksumMatches : 1,
406 isReExported : 1,
407 isSubFramework : 1;
408 };
409
410 struct DependentLibraryInfo {
411 const char* name;
412 LibraryInfo info;
413 bool required;
414 bool reExported;
415 };
416
417 class SegmentIterator
418 {
419 public:
420 SegmentIterator& operator++(); // use inline later to work around circular reference
421 bool operator!=(const SegmentIterator& it) const { return (it.fLocation != this->fLocation); }
422 class Segment* operator*() const { return fLocation; }
423 SegmentIterator(class Segment* loc) : fLocation(loc) {}
424 private:
425 class Segment* fLocation;
426 };
427
428 typedef void (*Initializer)(int argc, const char* argv[], const char* envp[], const char* apple[], const ProgramVars* vars);
429 typedef void (*Terminator)(void);
430
431 // To link() an image, its dependent libraries are loaded, it is rebased, bound, and initialized.
432 // These methods do the above, exactly once, and it the right order
433 void recursiveLoadLibraries(const LinkContext& context, const RPathChain& loaderRPaths);
434 void recursiveUnLoadMappedLibraries(const LinkContext& context);
435 unsigned int recursiveUpdateDepth(unsigned int maxDepth);
436 void recursiveValidate(const LinkContext& context);
437 void recursiveRebase(const LinkContext& context);
438 void recursiveBind(const LinkContext& context, bool forceLazysBound);
439 void recursiveGetDOFSections(const LinkContext& context, std::vector<DOFInfo>& dofs);
440 #if IMAGE_NOTIFY_SUPPORT
441 void recursiveImageAnnouncement(const LinkContext& context, ImageLoader**& newImages);
442 #endif
443 void recursiveInitialization(const LinkContext& context, mach_port_t this_thread);
444
445 // return how many libraries this image depends on
446 virtual uint32_t doGetDependentLibraryCount() = 0;
447
448 // fill in information about dependent libraries (array length is doGetDependentLibraryCount())
449 virtual void doGetDependentLibraries(DependentLibraryInfo libs[]) = 0;
450
451 // called on images that are libraries, returns info about itself
452 virtual LibraryInfo doGetLibraryInfo() = 0;
453
454 // do any fix ups in this image that depend only on the load address of the image
455 virtual void doRebase(const LinkContext& context) = 0;
456
457 // do any symbolic fix ups in this image
458 virtual void doBind(const LinkContext& context, bool forceLazysBound) = 0;
459
460 // update any segment permissions
461 virtual void doUpdateMappingPermissions(const LinkContext& context) = 0;
462
463 // if image has any dtrace DOF sections, append them to list to be registered
464 virtual void doGetDOFSections(const LinkContext& context, std::vector<DOFInfo>& dofs) = 0;
465
466 // run any initialization routines in this image
467 virtual void doInitialization(const LinkContext& context) = 0;
468
469 // return if this image has termination routines
470 virtual bool needsTermination() = 0;
471
472 // support for runtimes in which segments don't have to maintain their relative positions
473 virtual bool segmentsMustSlideTogether() const = 0;
474
475 // built with PIC code and can load at any address
476 virtual bool segmentsCanSlide() const = 0;
477
478 // set how much all segments slide
479 virtual void setSlide(intptr_t slide) = 0;
480
481 // utility routine to map in all segements in fSegments from a file
482 virtual void mapSegments(int fd, uint64_t offsetInFat, uint64_t lenInFat, uint64_t fileLen, const LinkContext& context);
483
484 // utility routine to map in all segements in fSegments from a memory image
485 virtual void mapSegments(const void* memoryImage, uint64_t imageLen, const LinkContext& context);
486
487 // returns if all dependent libraries checksum's were as expected and none slide
488 bool allDependentLibrariesAsWhenPreBound() const;
489
490 // in mach-o a child tells it parent to re-export, instead of the other way around...
491 virtual bool isSubframeworkOf(const LinkContext& context, const ImageLoader* image) const = 0;
492
493 // in mach-o a parent library knows name of sub libraries it re-exports..
494 virtual bool hasSubLibrary(const LinkContext& context, const ImageLoader* child) const = 0;
495
496 // set fState to dyld_image_state_memory_mapped
497 void setMapped(const LinkContext& context);
498
499 // mark that target should not be unloaded unless this is also unloaded
500 void addDynamicReference(const ImageLoader* target);
501
502 // used to start iterating Segments
503 virtual SegmentIterator beginSegments() const = 0;
504
505 // used to end iterating Segments
506 virtual SegmentIterator endSegments() const = 0;
507
508
509 static uint32_t fgImagesWithUsedPrebinding;
510 static uint32_t fgImagesUsedFromSharedCache;
511 static uint32_t fgImagesRequiringNoFixups;
512 static uint32_t fgTotalRebaseFixups;
513 static uint32_t fgTotalBindFixups;
514 static uint32_t fgTotalBindSymbolsResolved;
515 static uint32_t fgTotalBindImageSearches;
516 static uint32_t fgTotalLazyBindFixups;
517 static uint32_t fgTotalPossibleLazyBindFixups;
518 static uint32_t fgTotalSegmentsMapped;
519 static uint64_t fgTotalBytesMapped;
520 static uint64_t fgTotalBytesPreFetched;
521 static uint64_t fgTotalLoadLibrariesTime;
522 static uint64_t fgTotalRebaseTime;
523 static uint64_t fgTotalBindTime;
524 static uint64_t fgTotalInitTime;
525 static uintptr_t fgNextSplitSegAddress;
526 const char* fPath;
527 const char* fLogicalPath; // for ZeroLink - the image which this bundle is part of
528 dev_t fDevice;
529 ino_t fInode;
530 time_t fLastModified;
531 uint64_t fOffsetInFatFile;
532 DependentLibrary* fLibraries;
533 uint32_t fLibrariesCount;
534 uint32_t fPathHash;
535 uint32_t fDlopenReferenceCount; // count of how many dlopens have been done on this image
536 uint32_t fStaticReferenceCount; // count of images that have a fLibraries entry pointing to this image
537 uint32_t fDynamicReferenceCount; // count of images that have a fDynamicReferences entry pointer to this image
538 std::set<const ImageLoader*>* fDynamicReferences; // list of all images this image used because of a flat/coalesced lookup
539
540 private:
541 #if RECURSIVE_INITIALIZER_LOCK
542 struct recursive_lock {
543 recursive_lock(mach_port_t t) : thread(t), count(0) {}
544 mach_port_t thread;
545 int count;
546 };
547 void recursiveSpinLock(recursive_lock&);
548 void recursiveSpinUnLock();
549 #endif
550
551 void init(const char* path, uint64_t offsetInFat, dev_t device, ino_t inode, time_t modDate);
552 intptr_t assignSegmentAddresses(const LinkContext& context);
553 const ImageLoader::Symbol* findExportedSymbolInDependentImagesExcept(const char* name, const ImageLoader** dsiStart,
554 const ImageLoader**& dsiCur, const ImageLoader** dsiEnd, const ImageLoader** foundIn) const;
555
556
557
558 uint16_t fDepth;
559 uint16_t fLoadOrder;
560 uint32_t fState : 8,
561 fAllLibraryChecksumsAndLoadAddressesMatch : 1,
562 fLeaveMapped : 1, // when unloaded, leave image mapped in cause some other code may have pointers into it
563 fNeverUnload : 1, // image was statically loaded by main executable
564 fHideSymbols : 1, // ignore this image's exported symbols when linking other images
565 fMatchByInstallName : 1,// look at image's install-path not its load path
566 fRegisteredDOF : 1,
567 #if IMAGE_NOTIFY_SUPPORT
568 fAnnounced : 1,
569 #endif
570 fAllLazyPointersBound : 1,
571 fBeingRemoved : 1,
572 fPathOwnedByImage : 1;
573
574 #if RECURSIVE_INITIALIZER_LOCK
575 recursive_lock* fInitializerRecursiveLock;
576 #else
577 uint32_t fInitializerLock;
578 #endif
579 static uint16_t fgLoadOrdinal;
580 };
581
582
583 //
584 // Segment is an abstract base class. A segment is a chunk of an executable
585 // file that is mapped into memory. Each subclass of ImageLoader typically
586 // implements its own concrete subclass of Segment.
587 //
588 //
589 class Segment {
590 public:
591 virtual ~Segment() {}
592
593 virtual const char* getName() = 0;
594 virtual uintptr_t getSize() = 0;
595 virtual uintptr_t getFileSize() = 0;
596 virtual bool hasTrailingZeroFill();
597 virtual uintptr_t getFileOffset() = 0;
598 virtual bool readable() = 0;
599 virtual bool writeable() = 0;
600 virtual bool executable() = 0;
601 virtual bool unaccessible() = 0;
602 virtual uintptr_t getActualLoadAddress(const ImageLoader*) = 0;
603 virtual uintptr_t getPreferredLoadAddress() = 0;
604 virtual void unmap(const ImageLoader*) = 0;
605 virtual Segment* next(Segment*) = 0;
606 #if __i386__
607 virtual bool readOnlyImportStubs() = 0;
608 #endif
609
610
611 protected:
612 // abstract base class so all constructors protected
613 Segment() {}
614 Segment(const Segment&);
615 void operator=(const Segment&);
616
617 virtual bool hasPreferredLoadAddress() = 0;
618 //virtual void setActualLoadAddress(uint64_t addr) = 0;
619 virtual void map(int fd, uint64_t offsetInFatWrapper, intptr_t slide, const ImageLoader* image, const ImageLoader::LinkContext& context);
620
621 static bool reserveAddressRange(uintptr_t start, size_t length);
622 static uintptr_t reserveAnAddressRange(size_t length, const class ImageLoader::LinkContext& context);
623 static uintptr_t fgNextPIEDylibAddress;
624
625 private:
626 void setPermissions(const ImageLoader::LinkContext& context, const ImageLoader* image);
627 void map(const void* memoryImage, intptr_t slide, const ImageLoader* image, const ImageLoader::LinkContext& context);
628 void tempWritable(const ImageLoader::LinkContext& context, const ImageLoader* image);
629
630 friend class ImageLoader;
631 friend class ImageLoaderMachO;
632 };
633
634 inline ImageLoader::SegmentIterator& ImageLoader::SegmentIterator::operator++() { fLocation = fLocation->next(fLocation); return *this; }
635
636
637
638
639 #endif
640
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