]>
git.siccegge.de Git - frida/frida.git/blob - src/disassembler/llvm/LLVMDisassembler.cxx
1 #include "disassembler/llvm/LLVMDisassembler.hxx"
2 #include "disassembler/llvm/LLVMBasicBlock.hxx"
3 #include "disassembler/llvm/LLVMFunction.hxx"
9 using namespace llvm::object
;
12 * TODO: fallback code falls die Datei kein ELF/PE/COFF/MacO/.. binary
13 * ist sondern z.B. einfach nur Instruktionen oder ein Bootsektor oder
16 LLVMDisassembler::LLVMDisassembler(const std::string
& filename
)
17 : Disassembler(filename
)
18 , logger(log4cxx::Logger::getLogger("LLVMDisassembler"))
19 , triple("unknown-unknown-unknown")
21 LOG4CXX_DEBUG(logger
, "Handling file" << filename
);
22 auto result
= createBinary(filename
);
25 if ((ec
= result
.getError())) {
26 LOG4CXX_ERROR(logger
, "Failed to load Binary" << ec
.message());
31 binary
.reset(result
.get());
33 o
= dyn_cast
<ObjectFile
>(binary
.get());
35 triple
.setArch(Triple::ArchType(o
->getArch()));
36 std::string
tripleName(triple
.getTriple());
38 LOG4CXX_INFO(logger
, "Architecture " << tripleName
);
42 target
= TargetRegistry::lookupTarget("", triple
, es
);
44 LOG4CXX_ERROR(logger
, es
);
48 LOG4CXX_INFO(logger
, "Target " << target
->getName());
50 MRI
.reset(target
->createMCRegInfo(tripleName
));
52 LOG4CXX_ERROR(logger
, "no register info for target " << tripleName
);
56 // Set up disassembler.
57 AsmInfo
.reset(target
->createMCAsmInfo(*MRI
, tripleName
));
59 LOG4CXX_ERROR(logger
, "no assembly info for target " << tripleName
);
63 STI
.reset(target
->createMCSubtargetInfo(tripleName
, "", ""));
65 LOG4CXX_ERROR(logger
, "no subtarget info for target " << tripleName
);
69 MII
.reset(target
->createMCInstrInfo());
71 LOG4CXX_ERROR(logger
, "no instruction info for target " << tripleName
);
75 DisAsm
.reset(target
->createMCDisassembler(*STI
));
77 LOG4CXX_ERROR(logger
, "no disassembler for target " << tripleName
);
81 MOFI
.reset(new MCObjectFileInfo
);
82 Ctx
.reset(new MCContext(AsmInfo
.get(), MRI
.get(), MOFI
.get()));
84 target
->createMCRelocationInfo(tripleName
, *Ctx
.get()));
87 MCObjectSymbolizer::createObjectSymbolizer(*Ctx
.get(), RelInfo
, o
));
89 DisAsm
->setSymbolizer(Symzer
);
92 MIA
.reset(target
->createMCInstrAnalysis(MII
.get()));
94 int AsmPrinterVariant
= AsmInfo
->getAssemblerDialect();
95 IP
.reset(target
->createMCInstPrinter(AsmPrinterVariant
, *AsmInfo
, *MII
, *MRI
, *STI
));
97 LOG4CXX_ERROR(logger
, "no instruction printer for target " << tripleName
);
101 IP
->setPrintImmHex(llvm::HexStyle::C
);
102 IP
->setPrintImmHex(true);
104 OwningPtr
<MCObjectDisassembler
> OD(
105 new MCObjectDisassembler(*o
, *DisAsm
, *MIA
));
106 Mod
.reset(OD
->buildModule(false));
113 LLVMDisassembler::~LLVMDisassembler() {
114 std::for_each(functions
.begin(), functions
.end(),
115 [](std::pair
<uint64_t,LLVMFunction
*> it
) {
118 std::for_each(blocks
.begin(), blocks
.end(),
119 [](std::pair
<uint64_t, LLVMBasicBlock
*> it
) {
124 void LLVMDisassembler::disassemble() {
125 std::stack
<LLVMFunction
*> remaining_functions
;
126 std::stack
<LLVMBasicBlock
*> remaining_blocks
;
127 SectionRef text_section
= sections
[".text"];
129 // Assume all function symbols actually start a real function
130 for (auto x
= symbols
.begin(); x
!= symbols
.end(); ++x
) {
133 SymbolRef::Type symbol_type
;
136 if (text_section
.containsSymbol(x
->second
, contains
) || !contains
)
139 if (x
->second
.getType(symbol_type
)
140 || SymbolRef::ST_Function
!= symbol_type
)
143 if (!x
->second
.getAddress(result
)) {
144 LLVMFunction
* fun
= new LLVMFunction(x
->first
, result
);
145 remaining_functions
.push(fun
);
146 functions
.insert(std::make_pair(result
, fun
));
147 LOG4CXX_DEBUG(logger
, "Disasembling " << x
->first
);
152 text_section
.getContents(bytes
);
153 StringRefMemoryObject
ref(bytes
);
155 while (remaining_functions
.size()) {
156 LLVMFunction
* current_function
= remaining_functions
.top();
157 remaining_functions
.pop();
159 LOG4CXX_DEBUG(logger
, "Handling function " << current_function
->getName());
161 LLVMBasicBlock
* block
= new LLVMBasicBlock(current_function
->getStartAddress(), this);
162 remaining_blocks
.push(block
);
163 blocks
.insert(std::make_pair(block
->getStartAddress(), block
));
165 while (remaining_blocks
.size()) {
166 LLVMBasicBlock
* current_block
= remaining_blocks
.top();
167 remaining_blocks
.pop();
169 LOG4CXX_DEBUG(logger
, "Handling Block starting at " << std::hex
<< current_block
->getStartAddress());
172 uint64_t base_address
;
173 text_section
.getAddress(base_address
);
174 uint64_t current_address
= current_block
->getStartAddress() - base_address
;
178 llvm::raw_string_ostream
s(buf
);
180 if(llvm::MCDisassembler::Success
==
181 DisAsm
->getInstruction(inst
, inst_size
, ref
, current_address
, nulls(), nulls())) {
184 if (MIA
->evaluateBranch(inst
, current_address
, inst_size
, jmptarget
)) {
185 jmptarget
+= base_address
;
186 if (!MIA
->isIndirectBranch(inst
)) {
187 if (MIA
->isCall(inst
)) {
188 if (functions
.find(jmptarget
) == functions
.end()) {
190 s
<< "<Unnamed 0x" << std::hex
<< jmptarget
<< ">";
191 LLVMFunction
* fun
= new LLVMFunction(s
.str(), jmptarget
);
192 functions
.insert(std::make_pair(jmptarget
, fun
));
193 remaining_functions
.push(fun
);
196 current_block
->setNextBlock(0, jmptarget
);
197 if (blocks
.find(jmptarget
) == blocks
.end()) {
198 LLVMBasicBlock
* block
= new LLVMBasicBlock(jmptarget
, this);
199 blocks
.insert(std::make_pair(block
->getStartAddress(), block
));
200 remaining_blocks
.push(block
);
202 if (MIA
->isConditionalBranch(inst
)) {
203 jmptarget
= base_address
+ current_address
+ inst_size
;
204 current_block
->setNextBlock(1, jmptarget
);
205 if (blocks
.find(jmptarget
) == blocks
.end()) {
206 LLVMBasicBlock
* block
= new LLVMBasicBlock(jmptarget
, this);
207 blocks
.insert(std::make_pair(block
->getStartAddress(), block
));
208 remaining_blocks
.push(block
);
219 if (inst_size
== 0 || MIA
->isTerminator(inst
) || MIA
->isBranch(inst
)) {
220 current_block
->setEndAddress(current_address
+ base_address
+ inst_size
);
221 LOG4CXX_DEBUG(logger
, "Finished Block at " << std::hex
<<
222 current_block
->getEndAddress());
225 current_address
+= inst_size
;
228 LOG4CXX_DEBUG(logger
, "Finished function " << current_function
->getName());
231 // Split blocks where jumps are going inside the block
232 for (auto it
= blocks
.begin(); it
!= blocks
.end(); ++it
) {
233 LLVMBasicBlock
* current_block
= it
->second
;
235 uint64_t base_address
;
236 text_section
.getAddress(base_address
);
237 uint64_t current_address
= current_block
->getStartAddress() - base_address
;
238 while(current_block
->getEndAddress() - base_address
!= current_address
) {
241 llvm::raw_string_ostream
s(buf
);
243 if(llvm::MCDisassembler::Success
==
244 DisAsm
->getInstruction(inst
, inst_size
, ref
, current_address
, nulls(), nulls())) {
245 auto other
= blocks
.find(current_address
+ inst_size
+ base_address
);
247 if (other
!= blocks
.end()) {
248 LOG4CXX_DEBUG(logger
, "Shortening block starting at "
250 << current_block
->getStartAddress()
253 current_block
->setEndAddress(current_address
+ inst_size
+ base_address
);
254 current_block
->setNextBlock(0, other
->first
);
255 current_block
->setNextBlock(1, 0);
260 current_address
+= inst_size
;
265 void LLVMDisassembler::readSymbols() {
267 symbol_iterator
si(o
->symbol_begin()), se(o
->symbol_end());
268 for (; si
!= se
; ++si
) {
270 if ((ec
= si
->getName(name
))) {
271 LOG4CXX_ERROR(logger
, ec
.message());
274 LOG4CXX_DEBUG(logger
, "Added symbol " << name
.str());
275 symbols
.insert(make_pair(name
.str(), *si
));
279 void LLVMDisassembler::readSections() {
281 section_iterator
i(o
->section_begin()), e(o
->section_end());
282 for (; i
!= e
; ++i
) {
284 if ((ec
= i
->getName(name
))) {
285 LOG4CXX_ERROR(logger
, ec
.message());
288 LOG4CXX_DEBUG(logger
, "Added section " << name
.str());
289 sections
.insert(make_pair(name
.str(), *i
));
294 void LLVMDisassembler::forEachFunction(std::function
<void (uint64_t, Function
*)> callback
) {
295 std::for_each(functions
.begin(), functions
.end(),
296 [&](std::pair
<uint64_t, LLVMFunction
*> x
) {
297 callback(x
.first
, x
.second
);
301 void LLVMDisassembler::printEachInstruction(uint64_t start
, uint64_t end
,
302 std::function
<void (uint8_t*, size_t, const std::string
&)> fun
) {
303 SectionRef text_section
= sections
[".text"];
304 uint64_t base_address
;
305 text_section
.getAddress(base_address
);
306 uint64_t current_address
= start
- base_address
;
309 text_section
.getContents(bytes
);
310 StringRefMemoryObject
ref(bytes
);
312 while (current_address
< end
- base_address
) {
316 llvm::raw_string_ostream
s(buf
);
318 if(llvm::MCDisassembler::Success
==
319 DisAsm
->getInstruction(inst
, inst_size
, ref
, current_address
, nulls(), nulls())) {
321 uint8_t bytes
[inst_size
+2];
322 ref
.readBytes(current_address
, inst_size
, bytes
);
324 IP
->printInst(&inst
, s
, "");
325 fun(bytes
, inst_size
, s
.str());
327 LOG4CXX_WARN(logger
, "Invalid byte at" << std::hex
<< current_address
+ base_address
);
328 fun(NULL
, 0, "Invalid Byte");
332 current_address
+= inst_size
;