X-Git-Url: https://git.siccegge.de//index.cgi?p=frida%2Ffrida.git;a=blobdiff_plain;f=src%2Fdisassembler%2Fllvm%2FLLVMDisassembler.cxx;h=1ae024a5aea39f9ef6dd786e3933768e8cc6cf5c;hp=7980a9e1377a315dd97fbe1fb945b64edf8ead8e;hb=70d986e452c08aea59d947bfd5700f6c60b3f820;hpb=624ff50c7324a3954c0b00cdb8f61a38fc6b6c41

diff --git a/src/disassembler/llvm/LLVMDisassembler.cxx b/src/disassembler/llvm/LLVMDisassembler.cxx
index 7980a9e..1ae024a 100644
--- a/src/disassembler/llvm/LLVMDisassembler.cxx
+++ b/src/disassembler/llvm/LLVMDisassembler.cxx
@@ -7,6 +7,7 @@
 
 using namespace llvm;
 using namespace llvm::object;
+using std::error_code;
 
 /*
  * TODO: fallback code falls die Datei kein ELF/PE/COFF/MacO/.. binary
@@ -72,24 +73,30 @@ LLVMDisassembler::LLVMDisassembler(const std::string& filename)
         return;
     }
 
-    DisAsm.reset(target->createMCDisassembler(*STI));
+    MOFI.reset(new MCObjectFileInfo);
+    MCContext Ctx(AsmInfo.get(), MRI.get(), MOFI.get());
+
+    DisAsm.reset(target->createMCDisassembler(*STI, Ctx));
     if (!DisAsm) {
         LOG4CXX_ERROR(logger, "no disassembler for target " << tripleName);
         return;
     }
-
-    MOFI.reset(new MCObjectFileInfo);
-    Ctx.reset(new MCContext(AsmInfo.get(), MRI.get(), MOFI.get()));
     RelInfo.reset(
-        target->createMCRelocationInfo(tripleName, *Ctx.get()));
+        target->createMCRelocationInfo(tripleName, Ctx));
     if (RelInfo) {
         Symzer.reset(
-            MCObjectSymbolizer::createObjectSymbolizer(*Ctx.get(), RelInfo, o));
+            MCObjectSymbolizer::createObjectSymbolizer(Ctx, std::move(RelInfo), o));
         if (Symzer)
-            DisAsm->setSymbolizer(Symzer);
+            DisAsm->setSymbolizer(std::move(Symzer));
     }
+    RelInfo.release();
+    Symzer.release();
 
     MIA.reset(target->createMCInstrAnalysis(MII.get()));
+    if (!MIA) {
+        LOG4CXX_ERROR(logger, "no instruction analysis for target " << tripleName);
+        return;
+    }
 
     int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
     IP.reset(target->createMCInstPrinter(AsmPrinterVariant, *AsmInfo, *MII, *MRI, *STI));
@@ -101,7 +108,7 @@ LLVMDisassembler::LLVMDisassembler(const std::string& filename)
     IP->setPrintImmHex(llvm::HexStyle::C);
     IP->setPrintImmHex(true);
 
-    OwningPtr<MCObjectDisassembler> OD(
+    std::unique_ptr<MCObjectDisassembler> OD(
         new MCObjectDisassembler(*o, *DisAsm, *MIA));
     Mod.reset(OD->buildModule(false));
 
@@ -148,6 +155,40 @@ void LLVMDisassembler::disassemble() {
         }
     }
 
+    if (binary->isELF()) {
+        bool is64bit = (binary->getData()[4] == 0x02);
+
+        uint64_t entry(0);
+        for (int i(0); i < (is64bit? 8 : 4); ++i) {
+            if (binary->isLittleEndian()) {
+                entry |= (unsigned int)((unsigned char)binary->getData()[0x18 + i]) << 8*i;
+            } else {
+                entry = entry << 8;
+                entry |= (unsigned char)binary->getData()[0x18 + i];
+            }
+        }
+        if (functions.find(entry) == functions.end()) {
+            LOG4CXX_DEBUG(logger, "Adding entry at: " << std::hex << entry);
+            std::stringstream s;
+            s << "<_start 0x" << std::hex << entry << ">";
+            LLVMFunction * fun = new LLVMFunction(s.str(), entry);
+            functions.insert(std::make_pair(entry, fun));
+            remaining_functions.push(fun);
+        }
+    }
+
+    if (functions.empty()) {
+        uint64_t text_entry;
+        text_section.getAddress(text_entry);
+        LOG4CXX_INFO(logger, "No Symbols found, starting at the beginning of the text segment");
+
+        std::stringstream s;
+        s << "<Unnamed 0x" << std::hex << text_entry << ">";
+        LLVMFunction * fun = new LLVMFunction(s.str(), text_entry);
+        functions.insert(std::make_pair(text_entry, fun));
+        remaining_functions.push(fun);
+    }
+
     StringRef bytes;
     text_section.getContents(bytes);
     StringRefMemoryObject ref(bytes);
@@ -193,18 +234,18 @@ void LLVMDisassembler::disassemble() {
                                     remaining_functions.push(fun);
                                 }
                             } else {
+								current_block->setNextBlock(0, jmptarget);
                                 if (blocks.find(jmptarget) == blocks.end()) {
                                     LLVMBasicBlock * block = new LLVMBasicBlock(jmptarget, this);
                                     blocks.insert(std::make_pair(block->getStartAddress(), block));
-                                    current_block->setNextBlock(0, block->getStartAddress());
                                     remaining_blocks.push(block);
                                 }
                                 if (MIA->isConditionalBranch(inst)) {
                                     jmptarget = base_address + current_address + inst_size;
+									current_block->setNextBlock(1, jmptarget);
                                     if (blocks.find(jmptarget) == blocks.end()) {
                                         LLVMBasicBlock * block = new LLVMBasicBlock(jmptarget, this);
                                         blocks.insert(std::make_pair(block->getStartAddress(), block));
-                                        current_block->setNextBlock(1, block->getStartAddress());
                                         remaining_blocks.push(block);
                                     }
                                 }
@@ -235,7 +276,7 @@ void LLVMDisassembler::disassemble() {
 		uint64_t base_address;
 		text_section.getAddress(base_address);
 		uint64_t current_address = current_block->getStartAddress() - base_address;
-		while(current_block->getEndAddress() - base_address != current_address) {
+		while(current_block->getEndAddress() - base_address > current_address) {
 			MCInst inst;
 			std::string buf;
 			llvm::raw_string_ostream s(buf);
@@ -245,14 +286,17 @@ void LLVMDisassembler::disassemble() {
 				auto other = blocks.find(current_address + inst_size + base_address);
 
 				if (other != blocks.end()) {
-					LOG4CXX_DEBUG(logger, "Shortening block starting at "
-								  << std::hex
-								  << current_block->getStartAddress()
-								  << " now ending at "
-								  << other->first);
-					current_block->setEndAddress(current_address + inst_size + base_address);
-					current_block->setNextBlock(0, other->first);
-					current_block->setNextBlock(1, 0);
+					uint64_t endaddress = current_address + inst_size + base_address;
+					if (endaddress != current_block->getEndAddress()) {
+						LOG4CXX_DEBUG(logger, "Shortening block starting at "
+									  << std::hex
+									  << current_block->getStartAddress()
+									  << " now ending at "
+									  << other->first);
+						current_block->setEndAddress(endaddress);
+						current_block->setNextBlock(0, other->first);
+						current_block->setNextBlock(1, 0);
+					}
 				}
 			} else {
 				inst_size = 1;
@@ -321,9 +365,17 @@ void LLVMDisassembler::printEachInstruction(uint64_t start, uint64_t end,
             uint8_t bytes[inst_size+2];
             ref.readBytes(current_address, inst_size, bytes);
 
-            IP->printInst(&inst, s, "");
+			uint64_t jmptarget;
+			if (MIA->evaluateBranch(inst, current_address, inst_size, jmptarget)) {
+				std::stringstream stream;
+				stream << std::hex << (base_address + jmptarget);
+				IP->printInst(&inst, s, stream.str());
+			} else
+				IP->printInst(&inst, s, "");
+
 			fun(bytes, inst_size, s.str());
         } else {
+			LOG4CXX_WARN(logger, "Invalid byte at" << std::hex << current_address + base_address);
 			fun(NULL, 0, "Invalid Byte");
 			inst_size = 1;
 		}