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git.siccegge.de Git - frida/frida.git/blob - src/disassembler/llvm/LLVMDisassembler.cxx
1 #include "disassembler/llvm/LLVMDisassembler.hxx"
2 #include "core/InformationManager.hxx"
3 #include "core/Function.hxx"
4 #include "core/BasicBlock.hxx"
11 using namespace llvm::object
;
12 using std::error_code
;
17 Disassembler
* createLLVMDisassembler(const std::string
& filename
, InformationManager
* manager
) {
21 std::unique_ptr
<Binary
> o
;
22 o
.reset(createBinary(filename
).get());
23 Binary
* op
= o
.release();
25 // ELFType<endian, maxalign, 64bit>
26 if (ELF32LEObjectFile
* object
= dyn_cast
<ELF32LEObjectFile
>(op
)) {
27 return new LLVMDisassembler
<ELFType
<support::little
, 2, false>>(filename
, manager
, object
);
29 if (ELF64LEObjectFile
* object
= dyn_cast
<ELF64LEObjectFile
>(op
)) {
30 return new LLVMDisassembler
<ELFType
<support::little
, 2, true>>(filename
, manager
, object
);
32 if (ELF32BEObjectFile
* object
= dyn_cast
<ELF32BEObjectFile
>(op
)) {
33 return new LLVMDisassembler
<ELFType
<support::big
, 2, false>>(filename
, manager
, object
);
35 if (ELF64BEObjectFile
* object
= dyn_cast
<ELF64BEObjectFile
>(op
)) {
36 return new LLVMDisassembler
<ELFType
<support::big
, 2, true>>(filename
, manager
, object
);
43 * TODO: fallback code falls die Datei kein ELF/PE/COFF/MacO/.. binary
44 * ist sondern z.B. einfach nur Instruktionen oder ein Bootsektor oder
47 template <typename ELFT
>
48 LLVMDisassembler
<ELFT
>::LLVMDisassembler(const std::string
& filename
,
49 InformationManager
* manager
,
50 ELFObjectFile
<ELFT
>* file
)
52 , logger(log4cxx::Logger::getLogger("LLVMDisassembler"))
53 , triple("unknown-unknown-unknown")
56 LOG4CXX_DEBUG(logger
, "Handling file" << filename
);
59 auto result
= createBinary(filename
);
62 if ((ec
= result
.getError())) {
63 LOG4CXX_ERROR(logger
, "Failed to load Binary" << ec
.message());
68 binary
.reset(result
.get());
70 o
= dyn_cast
<ELFObjectFile
<ELFT
>>(binary
.get());
76 triple
.setArch(Triple::ArchType(o
->getArch()));
77 std::string
tripleName(triple
.getTriple());
79 LOG4CXX_INFO(logger
, "Architecture " << tripleName
);
83 target
= TargetRegistry::lookupTarget("", triple
, es
);
85 LOG4CXX_ERROR(logger
, es
);
89 LOG4CXX_INFO(logger
, "Target " << target
->getName());
91 MRI
.reset(target
->createMCRegInfo(tripleName
));
93 LOG4CXX_ERROR(logger
, "no register info for target " << tripleName
);
97 // Set up disassembler.
98 AsmInfo
.reset(target
->createMCAsmInfo(*MRI
, tripleName
));
100 LOG4CXX_ERROR(logger
, "no assembly info for target " << tripleName
);
104 STI
.reset(target
->createMCSubtargetInfo(tripleName
, "", ""));
106 LOG4CXX_ERROR(logger
, "no subtarget info for target " << tripleName
);
110 MII
.reset(target
->createMCInstrInfo());
112 LOG4CXX_ERROR(logger
, "no instruction info for target " << tripleName
);
116 MOFI
.reset(new MCObjectFileInfo
);
117 MCContext
Ctx(AsmInfo
.get(), MRI
.get(), MOFI
.get());
119 DisAsm
.reset(target
->createMCDisassembler(*STI
, Ctx
));
121 LOG4CXX_ERROR(logger
, "no disassembler for target " << tripleName
);
125 target
->createMCRelocationInfo(tripleName
, Ctx
));
128 MCObjectSymbolizer::createObjectSymbolizer(Ctx
, std::move(RelInfo
), o
));
130 DisAsm
->setSymbolizer(std::move(Symzer
));
135 MIA
.reset(target
->createMCInstrAnalysis(MII
.get()));
137 LOG4CXX_ERROR(logger
, "no instruction analysis for target " << tripleName
);
141 int AsmPrinterVariant
= AsmInfo
->getAssemblerDialect();
142 IP
.reset(target
->createMCInstPrinter(AsmPrinterVariant
, *AsmInfo
, *MII
, *MRI
, *STI
));
144 LOG4CXX_ERROR(logger
, "no instruction printer for target " << tripleName
);
148 IP
->setPrintImmHex(llvm::HexStyle::C
);
149 IP
->setPrintImmHex(true);
151 std::unique_ptr
<MCObjectDisassembler
> OD(
152 new MCObjectDisassembler(*o
, *DisAsm
, *MIA
));
153 Mod
.reset(OD
->buildModule(false));
156 template <typename ELFT
>
157 void LLVMDisassembler
<ELFT
>::start() {
161 readDynamicSymbols();
164 template <typename ELFT
>
165 LLVMDisassembler
<ELFT
>::~LLVMDisassembler() {}
167 template <typename ELFT
>
168 Function
* LLVMDisassembler
<ELFT
>::disassembleFunctionAt(uint64_t address
, const std::string
& name
) {
170 SectionRef text_section
= sections
[".text"];
171 uint64_t base_address
, size
;
172 text_section
.getAddress(base_address
);
173 text_section
.getSize(size
);
175 if (address
< base_address
||
176 address
>= base_address
+ size
) {
180 if (NULL
== (function
= manager
->getFunction(address
))) {
184 s
<< "<Unnamed 0x" << std::hex
<< address
<< ">";
185 function
= manager
->newFunction(address
);
186 function
->setName(s
.str());
188 function
= manager
->newFunction(address
);
189 function
->setName(name
);
191 disassembleFunction(function
);
192 manager
->finishFunction(function
);
198 template <typename ELFT
>
199 void LLVMDisassembler
<ELFT
>::disassembleFunction(Function
* function
) {
200 std::stack
<BasicBlock
*> remaining_blocks
;
202 * Do all blocks get added properly? We should take care to remove
203 * the other ones at the end of the function!
205 std::map
<uint64_t, BasicBlock
*> new_blocks
;
206 SectionRef text_section
= sections
[".text"];
208 text_section
.getContents(bytes
);
209 StringRefMemoryObject
ref(bytes
);
211 LOG4CXX_DEBUG(logger
, "Handling function " << function
->getName());
213 BasicBlock
* block
= manager
->newBasicBlock(function
->getStartAddress());
214 remaining_blocks
.push(block
);
215 new_blocks
.insert(std::make_pair(block
->getStartAddress(), block
));
216 function
->addBasicBlock(block
);
218 while (remaining_blocks
.size()) {
219 BasicBlock
* current_block
= remaining_blocks
.top();
220 remaining_blocks
.pop();
222 LOG4CXX_DEBUG(logger
, "Handling Block starting at " << std::hex
223 << current_block
->getStartAddress());
226 uint64_t base_address
;
227 text_section
.getAddress(base_address
);
228 uint64_t current_address
= current_block
->getStartAddress() - base_address
;
232 llvm::raw_string_ostream
s(buf
);
234 if(llvm::MCDisassembler::Success
==
235 DisAsm
->getInstruction(inst
, inst_size
, ref
, current_address
, nulls(), nulls())) {
238 if (MIA
->evaluateBranch(inst
, current_address
, inst_size
, jmptarget
)) {
239 jmptarget
+= base_address
;
240 if (!MIA
->isIndirectBranch(inst
)) {
241 if (MIA
->isCall(inst
)) {
242 if (NULL
== manager
->getFunction(jmptarget
))
243 disassembleFunctionAt(jmptarget
);
245 current_block
->setNextBlock(0, jmptarget
);
246 if (new_blocks
.find(jmptarget
) == new_blocks
.end()) {
247 BasicBlock
* block
= manager
->newBasicBlock(jmptarget
);
249 new_blocks
.insert(std::make_pair(block
->getStartAddress(), block
));
250 function
->addBasicBlock(block
);
251 remaining_blocks
.push(block
);
253 LOG4CXX_DEBUG(logger
, "Reusing Block starting at " << std::hex
254 << current_block
->getStartAddress());
255 function
->addBasicBlock(new_blocks
.find(jmptarget
)->second
);
257 if (MIA
->isConditionalBranch(inst
)) {
258 jmptarget
= base_address
+ current_address
+ inst_size
;
259 current_block
->setNextBlock(1, jmptarget
);
260 if (new_blocks
.find(jmptarget
) == new_blocks
.end()) {
261 BasicBlock
* block
= manager
->newBasicBlock(jmptarget
);
263 new_blocks
.insert(std::make_pair(block
->getStartAddress(), block
));
264 function
->addBasicBlock(block
);
265 remaining_blocks
.push(block
);
267 LOG4CXX_DEBUG(logger
, "Reusing Block starting at " << std::hex
268 << current_block
->getStartAddress());
269 function
->addBasicBlock(new_blocks
.find(jmptarget
)->second
);
280 if (inst_size
== 0 || MIA
->isTerminator(inst
) || MIA
->isBranch(inst
)) {
281 current_block
->setEndAddress(current_address
+ base_address
+ inst_size
);
282 LOG4CXX_DEBUG(logger
, "Finished Block at " << std::hex
<<
283 current_block
->getEndAddress());
286 current_address
+= inst_size
;
289 splitBlocks(function
);
290 LOG4CXX_DEBUG(logger
, "Finished function " << function
->getName());
291 manager
->signal_new_function(function
);
294 template <typename ELFT
>
295 void LLVMDisassembler
<ELFT
>::disassemble() {
296 SectionRef text_section
= sections
[".text"];
297 std::vector
<Function
*> remaining_functions
;
299 // Assume all function symbols actually start a real function
300 for (auto x
= symbols
.begin(); x
!= symbols
.end(); ++x
) {
303 SymbolRef::Type symbol_type
;
306 if (text_section
.containsSymbol(x
->second
, contains
) || !contains
)
309 if (x
->second
.getType(symbol_type
)
310 || SymbolRef::ST_Function
!= symbol_type
)
313 if (!x
->second
.getAddress(result
)) {
314 Function
* fun
= manager
->newFunction(result
);
315 fun
->setName(x
->first
);
316 remaining_functions
.push_back(fun
);
317 LOG4CXX_DEBUG(logger
, "Disasembling " << x
->first
);
321 for (Function
* function
: remaining_functions
) {
322 disassembleFunction(function
);
323 manager
->finishFunction(function
);
326 if (binary
->isELF()) {
327 const ELFO
* elffile
= o
->getELFFile();
328 const typename
ELFO::Elf_Ehdr
* header
= elffile
->getHeader();
330 _entryAddress
= header
->e_entry
;
331 LOG4CXX_DEBUG(logger
, "Adding entryAddress at: " << std::hex
<< _entryAddress
);
333 s
<< "<_start 0x" << std::hex
<< _entryAddress
<< ">";
335 disassembleFunctionAt(_entryAddress
, s
.str());
338 if (!manager
->hasFunctions()) {
340 text_section
.getAddress(text_entry
);
341 LOG4CXX_INFO(logger
, "No Symbols found, starting at the beginning of the text segment");
342 disassembleFunctionAt(text_entry
);
346 template <typename ELFT
>
347 void LLVMDisassembler
<ELFT
>::splitBlocks(Function
* function
) {
348 SectionRef text_section
= sections
[".text"];
350 text_section
.getContents(bytes
);
351 StringRefMemoryObject
ref(bytes
);
353 // Split blocks where jumps are going inside the block
354 for (auto it
= function
->blocks().begin();
355 it
!= function
->blocks().end();
357 BasicBlock
* current_block
= it
->second
;
359 uint64_t base_address
;
360 text_section
.getAddress(base_address
);
361 uint64_t current_address
= current_block
->getStartAddress() - base_address
;
362 while(current_block
->getEndAddress() - base_address
> current_address
) {
365 llvm::raw_string_ostream
s(buf
);
367 if(llvm::MCDisassembler::Success
==
368 DisAsm
->getInstruction(inst
, inst_size
, ref
, current_address
, nulls(), nulls())) {
369 // See if some other block starts here
370 BasicBlock
* other
= manager
->getBasicBlock(current_address
374 // Special case, other block starts here but we are at the end anyway
376 uint64_t endaddress
= current_address
+ inst_size
+ base_address
;
377 if (endaddress
!= current_block
->getEndAddress()) {
378 LOG4CXX_DEBUG(logger
, "Shortening block starting at "
380 << current_block
->getStartAddress()
382 << other
->getStartAddress());
383 function
->addBasicBlock(other
);
384 current_block
->setEndAddress(endaddress
);
385 current_block
->setNextBlock(0, other
->getStartAddress());
386 current_block
->setNextBlock(1, 0);
392 current_address
+= inst_size
;
397 template <typename ELFT
>
398 void LLVMDisassembler
<ELFT
>::readDynamicSymbols() {
399 const ELFO
* elffile
= o
->getELFFile();
400 for (typename
ELFO::Elf_Sym_Iter
401 it
= elffile
->begin_dynamic_symbols(),
402 end
= elffile
->end_dynamic_symbols();
405 if (it
->getType() == 2) { // Function
407 // TODO: Error handling
408 std::string symbolname
= *(elffile
->getSymbolName(it
));
409 std::string symbolversion
= *(elffile
->getSymbolVersion(nullptr, &*it
, is_default
));
410 manager
->signal_new_dyn_symbol(symbolname
+ (is_default
? "@@" : "@") + symbolversion
);
411 LOG4CXX_DEBUG(logger
, "Adding dynamic Symbol " << symbolname
<< (is_default
? "@@" : "@") << symbolversion
);
416 template <typename ELFT
>
417 void LLVMDisassembler
<ELFT
>::readSymbols() {
419 symbol_iterator
si(o
->symbol_begin()), se(o
->symbol_end());
420 for (; si
!= se
; ++si
) {
422 if ((ec
= si
->getName(name
))) {
423 LOG4CXX_ERROR(logger
, ec
.message());
426 LOG4CXX_DEBUG(logger
, "Added symbol " << name
.str());
427 symbols
.insert(make_pair(name
.str(), *si
));
431 template <typename ELFT
>
432 void LLVMDisassembler
<ELFT
>::readSections() {
434 section_iterator
i(o
->section_begin()), e(o
->section_end());
435 for (; i
!= e
; ++i
) {
437 if ((ec
= i
->getName(name
))) {
438 LOG4CXX_ERROR(logger
, ec
.message());
441 LOG4CXX_DEBUG(logger
, "Added section " << name
.str());
442 sections
.insert(make_pair(name
.str(), *i
));
447 // template <typename ELFT>
448 // void LLVMDisassembler<ELFT>::forEachFunction(std::function<void (uint64_t, Function*)> callback) {
449 // // std::for_each(functions.begin(), functions.end(),
450 // // [&](std::pair<uint64_t, Function*> x) {
451 // // callback(x.first, x.second);
455 template <typename ELFT
>
456 void LLVMDisassembler
<ELFT
>::printEachInstruction(uint64_t start
, uint64_t end
,
457 std::function
<void (uint8_t*, size_t,
459 const std::string
&)> fun
) {
460 SectionRef text_section
= sections
[".text"];
461 uint64_t base_address
;
462 text_section
.getAddress(base_address
);
463 uint64_t current_address
= start
- base_address
;
466 text_section
.getContents(bytes
);
467 StringRefMemoryObject
ref(bytes
);
469 while (current_address
< end
- base_address
) {
473 llvm::raw_string_ostream
s(buf
);
475 if(llvm::MCDisassembler::Success
==
476 DisAsm
->getInstruction(inst
, inst_size
, ref
, current_address
, nulls(), nulls())) {
478 uint8_t bytes
[inst_size
+2];
479 ref
.readBytes(current_address
, inst_size
, bytes
);
483 IP
->printInst(&inst
, s
, "");
484 if (MIA
->evaluateBranch(inst
, current_address
, inst_size
, jmptarget
)) {
485 std::stringstream stream
;
486 if (MIA
->isCall(inst
))
487 stream
<< "function:";
491 stream
<< std::hex
<< (base_address
+ jmptarget
);
496 fun(bytes
, inst_size
, s
.str(), ref
);
498 LOG4CXX_WARN(logger
, "Invalid byte at" << std::hex
<< current_address
+ base_address
);
499 fun(NULL
, 0, "Invalid Byte", "");
503 current_address
+= inst_size
;