]>
git.siccegge.de Git - frida/frida.git/blob - src/disassembler/llvm/LLVMDisassembler.cxx
3494b79bd8a370814d35eba28fec53db0e1543d6
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));
114 void LLVMDisassembler::disassemble() {
115 std::stack
<LLVMFunction
*> remaining_functions
;
116 std::stack
<LLVMBasicBlock
*> remaining_blocks
;
117 SectionRef text_section
= sections
[".text"];
119 for (auto x
= symbols
.begin(); x
!= symbols
.end(); ++x
) {
122 SymbolRef::Type symbol_type
;
125 * TODO: If we jump into some Basic Block we need to split it there into two
128 if (text_section
.containsSymbol(x
->second
, contains
) || !contains
)
131 if (x
->second
.getType(symbol_type
)
132 || SymbolRef::ST_Function
!= symbol_type
)
135 if (!x
->second
.getAddress(result
)) {
136 LLVMFunction
* fun
= new LLVMFunction(x
->first
, result
);
137 remaining_functions
.push(fun
);
138 functions
.insert(std::make_pair(result
, fun
));
139 LOG4CXX_DEBUG(logger
, "Disasembling " << x
->first
);
144 text_section
.getContents(bytes
);
145 StringRefMemoryObject
ref(bytes
);
147 while (remaining_functions
.size()) {
148 LLVMFunction
* current_function
= remaining_functions
.top();
149 remaining_functions
.pop();
151 LOG4CXX_DEBUG(logger
, "Handling function " << current_function
->getName());
153 // if ("_start" != current_function->getName())
156 LLVMBasicBlock
* block
= new LLVMBasicBlock(current_function
->getStartAddress());
157 remaining_blocks
.push(block
);
158 blocks
.insert(std::make_pair(block
->getStartAddress(), block
));
160 while (remaining_blocks
.size()) {
161 LLVMBasicBlock
* current_block
= remaining_blocks
.top();
162 remaining_blocks
.pop();
164 LOG4CXX_DEBUG(logger
, "Handling Block starting at " << std::hex
<< current_block
->getStartAddress());
167 uint64_t base_address
;
168 text_section
.getAddress(base_address
);
169 uint64_t current_address
= current_block
->getStartAddress() - base_address
;
173 llvm::raw_string_ostream
s(buf
);
175 if(llvm::MCDisassembler::Success
==
176 DisAsm
->getInstruction(inst
, inst_size
, ref
, current_address
, nulls(), nulls())) {
178 uint8_t bytes
[inst_size
+2];
179 ref
.readBytes(current_address
, inst_size
, bytes
);
181 for(uint8_t* cur
= bytes
; cur
< bytes
+ inst_size
; ++cur
) {
187 IP
->printInst(&inst
, s
, "");
189 LOG4CXX_DEBUG(logger
, std::hex
<< current_address
+ base_address
<< s
.str());
192 if (MIA
->evaluateBranch(inst
, current_address
, inst_size
, jmptarget
)) {
193 jmptarget
+= base_address
;
194 if (!MIA
->isIndirectBranch(inst
)) {
195 if (MIA
->isCall(inst
)) {
196 if (functions
.find(jmptarget
) == functions
.end()) {
198 s
<< "<Unnamed 0x" << std::hex
<< jmptarget
<< ">";
199 LLVMFunction
* fun
= new LLVMFunction(s
.str(), jmptarget
);
200 functions
.insert(std::make_pair(jmptarget
, fun
));
201 remaining_functions
.push(fun
);
204 if (blocks
.find(jmptarget
) == blocks
.end()) {
205 LLVMBasicBlock
* block
= new LLVMBasicBlock(jmptarget
);
206 blocks
.insert(std::make_pair(block
->getStartAddress(), block
));
207 remaining_blocks
.push(block
);
209 if (MIA
->isConditionalBranch(inst
)) {
210 jmptarget
= base_address
+ current_address
+ inst_size
;
211 if (blocks
.find(jmptarget
) == blocks
.end()) {
212 LLVMBasicBlock
* block
= new LLVMBasicBlock(jmptarget
);
213 blocks
.insert(std::make_pair(block
->getStartAddress(), block
));
214 remaining_blocks
.push(new LLVMBasicBlock(jmptarget
));
224 if (inst_size
== 0 || MIA
->isTerminator(inst
) || MIA
->isBranch(inst
)) {
225 current_block
->setEndAddress(current_address
+ base_address
);
226 LOG4CXX_DEBUG(logger
, "Finished Block at " << std::hex
<<
227 current_block
->getEndAddress());
231 current_address
+= inst_size
;
234 LOG4CXX_DEBUG(logger
, "Finished function " << current_function
->getName());
238 void LLVMDisassembler::readSymbols() {
240 symbol_iterator
si(o
->symbol_begin()), se(o
->symbol_end());
241 for (; si
!= se
; ++si
) {
243 if ((ec
= si
->getName(name
))) {
244 LOG4CXX_ERROR(logger
, ec
.message());
247 LOG4CXX_DEBUG(logger
, "Added symbol " << name
.str());
248 symbols
.insert(make_pair(name
.str(), *si
));
252 void LLVMDisassembler::readSections() {
254 section_iterator
i(o
->section_begin()), e(o
->section_end());
255 for (; i
!= e
; ++i
) {
257 if ((ec
= i
->getName(name
))) {
258 LOG4CXX_ERROR(logger
, ec
.message());
261 LOG4CXX_DEBUG(logger
, "Added section " << name
.str());
262 sections
.insert(make_pair(name
.str(), *i
));
267 void LLVMDisassembler::forEachFunction(std::function
<void (uint64_t, Function
*)> callback
) {
268 std::for_each(functions
.begin(), functions
.end(),
269 [&](std::pair
<uint64_t, LLVMFunction
*> x
) {
270 callback(x
.first
, x
.second
);
276 void LLVMDisassembler::generateControlFlowGraph(uint64_t address
) {