Esempio n. 1
0
//! [basicReadTest]
static void
basicReadTest(const P2::Partitioner &partitioner) {
    std::cout <<"\n" <<std::string(40, '=') <<"\nbasicReadTest\n" <<std::string(40, '=') <<"\n";
    SymbolicSemantics::Formatter fmt;
    fmt.set_line_prefix("  ");

    // Create the RiscOperators and the initial state.
    const RegisterDictionary *regdict = partitioner.instructionProvider().registerDictionary();
    const RegisterDescriptor REG = partitioner.instructionProvider().stackPointerRegister();
    const std::string REG_NAME = RegisterNames(regdict)(REG);
    BaseSemantics::RiscOperatorsPtr ops = SymbolicSemantics::RiscOperators::instance(regdict);
    ops->currentState()->memoryState()->set_byteOrder(partitioner.instructionProvider().defaultByteOrder());
    BaseSemantics::StatePtr initialState = ops->currentState()->clone();
    ops->initialState(initialState);                    // lazily evaluated initial state
    std::cout <<"Initial state before reading:\n" <<(*initialState+fmt);

    // Read some memory and a register, which should cause them to spring into existence in both the current state and the
    // initial state.
    BaseSemantics::SValuePtr addr1 = ops->number_(32, 0);
    BaseSemantics::SValuePtr dflt1m = ops->number_(32, 0x11223344);
    BaseSemantics::SValuePtr read1m = ops->readMemory(RegisterDescriptor(), addr1, dflt1m, ops->boolean_(true));
    BaseSemantics::SValuePtr dflt1r = ops->undefined_(REG.get_nbits());
    BaseSemantics::SValuePtr read1r = ops->readRegister(REG, dflt1r);

    std::cout <<"Initial state after reading " <<*read1m <<" from address " <<*addr1 <<"\n"
              <<"and " <<*read1r <<" from " <<REG_NAME <<"\n"
              <<(*initialState+fmt);
    ASSERT_always_require(read1m->must_equal(dflt1m));
    ASSERT_always_require(read1r->must_equal(dflt1r));

    // Create a new current state and read again. We should get the same value even though the current state is empty.
    BaseSemantics::StatePtr curState = ops->currentState()->clone();
    curState->clear();
    ops->currentState(curState);
    BaseSemantics::SValuePtr dflt2m = ops->number_(32, 0x55667788);
    BaseSemantics::SValuePtr read2m = ops->readMemory(RegisterDescriptor(), addr1, dflt2m, ops->boolean_(true));
    BaseSemantics::SValuePtr dflt2r = ops->undefined_(REG.get_nbits());
    BaseSemantics::SValuePtr read2r = ops->readRegister(REG, dflt2r);

    std::cout <<"Initial state after reading " <<*read2m <<" from address " <<*addr1 <<"\n"
              <<"and " <<*read2r <<" from " <<REG_NAME <<"\n"
              <<(*initialState+fmt);
    ASSERT_always_require(read1m->must_equal(read2m));
    ASSERT_always_require(read1r->must_equal(read2r));

    // Disable the initial state. If we re-read the same address we'll still get the same result because it's now present in
    // the current state also.
    ops->initialState(BaseSemantics::StatePtr());
    BaseSemantics::SValuePtr dflt3m = ops->number_(32, 0x99aabbcc);
    BaseSemantics::SValuePtr read3m = ops->readMemory(RegisterDescriptor(), addr1, dflt3m, ops->boolean_(true));
    BaseSemantics::SValuePtr dflt3r = ops->undefined_(REG.get_nbits());
    BaseSemantics::SValuePtr read3r = ops->readRegister(REG, dflt3r);
    ASSERT_always_require(read1m->must_equal(read3m));
    ASSERT_always_require(read1r->must_equal(read3r));
}
Esempio n. 2
0
/* Analyze a single interpretation a block at a time */
static void
analyze_interp(SgAsmInterpretation *interp)
{
    /* Get the set of all instructions except instructions that are part of left-over blocks. */
    struct AllInstructions: public SgSimpleProcessing, public std::map<rose_addr_t, SgAsmX86Instruction*> {
        void visit(SgNode *node) {
            SgAsmX86Instruction *insn = isSgAsmX86Instruction(node);
            SgAsmFunction *func = SageInterface::getEnclosingNode<SgAsmFunction>(insn);
            if (func && 0==(func->get_reason() & SgAsmFunction::FUNC_LEFTOVERS))
                insert(std::make_pair(insn->get_address(), insn));
        }
    } insns;
    insns.traverse(interp, postorder);

    while (!insns.empty()) {
        std::cout <<"=====================================================================================\n"
                  <<"=== Starting a new basic block                                                    ===\n"
                  <<"=====================================================================================\n";
        AllInstructions::iterator si = insns.begin();
        SgAsmX86Instruction *insn = si->second;
        insns.erase(si);

        BaseSemantics::RiscOperatorsPtr operators = make_ops();
        BaseSemantics::Formatter formatter;
        formatter.set_suppress_initial_values();
        formatter.set_show_latest_writers(do_usedef);
        BaseSemantics::DispatcherPtr dispatcher;
        if (do_trace) {
            // Enable RiscOperators tracing, but turn off a bunch of info that makes comparisons with a known good answer
            // difficult.
            Sawyer::Message::PrefixPtr prefix = Sawyer::Message::Prefix::instance();
            prefix->showProgramName(false);
            prefix->showThreadId(false);
            prefix->showElapsedTime(false);
            prefix->showFacilityName(Sawyer::Message::Prefix::NEVER);
            prefix->showImportance(false);
            Sawyer::Message::UnformattedSinkPtr sink = Sawyer::Message::StreamSink::instance(std::cout);
            sink->prefix(prefix);
            sink->defaultPropertiesNS().useColor = false;
            TraceSemantics::RiscOperatorsPtr trace = TraceSemantics::RiscOperators::instance(operators);
            trace->stream().destination(sink);
            trace->stream().enable();
            dispatcher = DispatcherX86::instance(trace, 32);
        } else {
            dispatcher = DispatcherX86::instance(operators, 32);
        }
        operators->set_solver(make_solver());

        // The fpstatus_top register must have a concrete value if we'll use the x86 floating-point stack (e.g., st(0))
        if (const RegisterDescriptor *REG_FPSTATUS_TOP = regdict->lookup("fpstatus_top")) {
            BaseSemantics::SValuePtr st_top = operators->number_(REG_FPSTATUS_TOP->get_nbits(), 0);
            operators->writeRegister(*REG_FPSTATUS_TOP, st_top);
        }

#if SEMANTIC_DOMAIN == SYMBOLIC_DOMAIN
        BaseSemantics::SValuePtr orig_esp;
        if (do_test_subst) {
            // Only request the orig_esp if we're going to use it later because it causes an esp value to be instantiated
            // in the state, which is printed in the output, and thus changes the answer.
            BaseSemantics::RegisterStateGeneric::promote(operators->get_state()->get_register_state())->initialize_large();
            orig_esp = operators->readRegister(*regdict->lookup("esp"));
            std::cout <<"Original state:\n" <<*operators;
        }
#endif

        /* Perform semantic analysis for each instruction in this block. The block ends when we no longer know the value of
         * the instruction pointer or the instruction pointer refers to an instruction that doesn't exist or which has already
         * been processed. */
        while (1) {
            /* Analyze current instruction */
            std::cout <<"\n" <<unparseInstructionWithAddress(insn) <<"\n";
            try {
                dispatcher->processInstruction(insn);
#   if 0 /*DEBUGGING [Robb P. Matzke 2013-05-01]*/
                show_state(operators); // for comparing RegisterStateGeneric with the old RegisterStateX86 output
#   else
                std::cout <<(*operators + formatter);
#   endif
            } catch (const BaseSemantics::Exception &e) {
                std::cout <<e <<"\n";
            }

            /* Never follow CALL instructions */
            if (insn->get_kind()==x86_call || insn->get_kind()==x86_farcall)
                break;

            /* Get next instruction of this block */
            BaseSemantics::SValuePtr ip = operators->readRegister(dispatcher->findRegister("eip"));
            if (!ip->is_number())
                break;
            rose_addr_t next_addr = ip->get_number();
            si = insns.find(next_addr);
            if (si==insns.end()) break;
            insn = si->second;
            insns.erase(si);
        }

        // Test substitution on the symbolic state.
#if SEMANTIC_DOMAIN == SYMBOLIC_DOMAIN
        if (do_test_subst) {
            SymbolicSemantics::SValuePtr from = SymbolicSemantics::SValue::promote(orig_esp);
            BaseSemantics::SValuePtr newvar = operators->undefined_(32);
            newvar->set_comment("frame_pointer");
            SymbolicSemantics::SValuePtr to =
                SymbolicSemantics::SValue::promote(operators->add(newvar, operators->number_(32, 4)));
            std::cout <<"Substituting from " <<*from <<" to " <<*to <<"\n";
            SymbolicSemantics::RiscOperators::promote(operators)->substitute(from, to);
            std::cout <<"Substituted state:\n" <<(*operators+formatter);
        }
#endif
    }
}
Esempio n. 3
0
/* Analyze a single interpretation a block at a time */
static void
analyze_interp(SgAsmInterpretation *interp)
{
    /* Get the set of all instructions except instructions that are part of left-over blocks. */
    struct AllInstructions: public SgSimpleProcessing, public std::map<rose_addr_t, SgAsmx86Instruction*> {
        void visit(SgNode *node) {
            SgAsmx86Instruction *insn = isSgAsmx86Instruction(node);
            SgAsmFunction *func = SageInterface::getEnclosingNode<SgAsmFunction>(insn);
            if (func && 0==(func->get_reason() & SgAsmFunction::FUNC_LEFTOVERS))
                insert(std::make_pair(insn->get_address(), insn));
        }
    } insns;
    insns.traverse(interp, postorder);

    while (!insns.empty()) {
        std::cout <<"=====================================================================================\n"
                  <<"=== Starting a new basic block                                                    ===\n"
                  <<"=====================================================================================\n";
        AllInstructions::iterator si = insns.begin();
        SgAsmx86Instruction *insn = si->second;
        insns.erase(si);

#if SEMANTIC_API == NEW_API
        BaseSemantics::RiscOperatorsPtr operators = make_ops();
        BaseSemantics::Formatter formatter;
        formatter.set_suppress_initial_values();
        BaseSemantics::DispatcherPtr dispatcher;
        if (do_trace) {
            TraceSemantics::RiscOperatorsPtr trace = TraceSemantics::RiscOperators::instance(operators);
            trace->set_stream(stdout);
            dispatcher = DispatcherX86::instance(trace);
        } else {
            dispatcher = DispatcherX86::instance(operators);
        }
        operators->set_solver(make_solver());
#else   // OLD_API
        typedef X86InstructionSemantics<MyPolicy, MyValueType> MyDispatcher;
        MyPolicy operators;
        MyDispatcher dispatcher(operators);
#   if SEMANTIC_DOMAIN == SYMBOLIC_DOMAIN
        operators.set_solver(make_solver());
        SymbolicSemantics::Formatter formatter;
        formatter.expr_formatter.do_rename = true;
        formatter.expr_formatter.add_renames = true;
#   elif SEMANTIC_DOMAIN != FINDCONST_DOMAIN && SEMANTIC_DOMAIN != FINDCONSTABI_DOMAIN
        BaseSemantics::Formatter formatter;
#   endif
#endif

#if SEMANTIC_DOMAIN == SYMBOLIC_DOMAIN && SEMANTIC_API == NEW_API
        BaseSemantics::SValuePtr orig_esp;
        if (do_test_subst) {
            // Only request the orig_esp if we're going to use it later because it causes an esp value to be instantiated
            // in the state, which is printed in the output, and thus changes the answer.
            BaseSemantics::RegisterStateGeneric::promote(operators->get_state()->get_register_state())->initialize_large();
            orig_esp = operators->readRegister(*regdict->lookup("esp"));
            std::cout <<"Original state:\n" <<*operators;
        }
#endif

        /* Perform semantic analysis for each instruction in this block. The block ends when we no longer know the value of
         * the instruction pointer or the instruction pointer refers to an instruction that doesn't exist or which has already
         * been processed. */
        while (1) {
            /* Analyze current instruction */
            std::cout <<"\n" <<unparseInstructionWithAddress(insn) <<"\n";
#if SEMANTIC_API == NEW_API
            try {
                dispatcher->processInstruction(insn);
#   if 0 /*DEBUGGING [Robb P. Matzke 2013-05-01]*/
                show_state(operators); // for comparing RegisterStateGeneric with the old RegisterStateX86 output
#   else
                std::cout <<(*operators + formatter);
#   endif
            } catch (const BaseSemantics::Exception &e) {
                std::cout <<e <<"\n";
            }
#else       // OLD API
            try {
                dispatcher.processInstruction(insn);
#   if SEMANTIC_DOMAIN == FINDCONST_DOMAIN || SEMANTIC_DOMAIN == FINDCONSTABI_DOMAIN
                operators.print(std::cout);
#   else
                operators.print(std::cout, formatter);
#   endif
            } catch (const MyDispatcher::Exception &e) {
                std::cout <<e <<"\n";
                break;
#   if SEMANTIC_DOMAIN == PARTSYM_DOMAIN
            } catch (const MyPolicy::Exception &e) {
                std::cout <<e <<"\n";
                break;
#   endif
            } catch (const SMTSolver::Exception &e) {
                std::cout <<e <<" [ "<<unparseInstructionWithAddress(insn) <<"]\n";
                break;
            }
#endif

            /* Never follow CALL instructions */
            if (insn->get_kind()==x86_call || insn->get_kind()==x86_farcall)
                break;

            /* Get next instruction of this block */
#if SEMANTIC_API == NEW_API
            BaseSemantics::SValuePtr ip = operators->readRegister(dispatcher->findRegister("eip"));
            if (!ip->is_number())
                break;
            rose_addr_t next_addr = ip->get_number();
#else       // OLD_API
#   if SEMANTIC_DOMAIN == PARTSYM_DOMAIN || SEMANTIC_DOMAIN == SYMBOLIC_DOMAIN
            MyValueType<32> ip = operators.get_ip();
            if (!ip.is_known()) break;
            rose_addr_t next_addr = ip.known_value();
#   elif SEMANTIC_DOMAIN == NULL_DOMAIN || SEMANTIC_DOMAIN == INTERVAL_DOMAIN
            MyValueType<32> ip = operators.readRegister<32>(dispatcher.REG_EIP);
            if (!ip.is_known()) break;
            rose_addr_t next_addr = ip.known_value();
#   elif SEMANTIC_DOMAIN == MULTI_DOMAIN
            PartialSymbolicSemantics::ValueType<32> ip = operators.readRegister<32>(dispatcher.REG_EIP)
                                                         .get_subvalue(MyMultiSemanticsClass::SP0());
            if (!ip.is_known()) break;
            rose_addr_t next_addr = ip.known_value();
#   else
            if (operators.newIp->get().name) break;
            rose_addr_t next_addr = operators.newIp->get().offset;
#   endif
#endif
            si = insns.find(next_addr);
            if (si==insns.end()) break;
            insn = si->second;
            insns.erase(si);
        }

        // Test substitution on the symbolic state.
#if SEMANTIC_DOMAIN == SYMBOLIC_DOMAIN && SEMANTIC_API == NEW_API
        if (do_test_subst) {
            SymbolicSemantics::SValuePtr from = SymbolicSemantics::SValue::promote(orig_esp);
            BaseSemantics::SValuePtr newvar = operators->undefined_(32);
            newvar->set_comment("frame_pointer");
            SymbolicSemantics::SValuePtr to =
                SymbolicSemantics::SValue::promote(operators->add(newvar, operators->number_(32, 4)));
            std::cout <<"Substituting from " <<*from <<" to " <<*to <<"\n";
            SymbolicSemantics::RiscOperators::promote(operators)->substitute(from, to);
            std::cout <<"Substituted state:\n" <<(*operators+formatter);
        }
#endif
    }
}
Esempio n. 4
0
int
main(int argc, char *argv[]) {
    ROSE_INITIALIZE;
    Diagnostics::initAndRegister(&::mlog, "tool");
    parseCommandLine(argc, argv);

    // Create the machine state
    const RegisterDictionary *registers = RegisterDictionary::dictionary_amd64();
    const RegisterDescriptor EAX = *registers->lookup("eax");
    SmtSolverPtr solver;
    BaseSemantics::RiscOperatorsPtr ops = SymbolicSemantics::RiscOperators::instance(registers, solver);
    ops->currentState()->memoryState()->set_byteOrder(ByteOrder::ORDER_LSB);

    // Initialize the machine state with some writes and get the string representation.
    BaseSemantics::SValuePtr eax = ops->number_(32, 1234);
    ops->writeRegister(EAX, eax);
    BaseSemantics::SValuePtr addr0 = ops->number_(32, 0x1000);
    BaseSemantics::SValuePtr mem0 = ops->number_(8, 123);
    ops->writeMemory(RegisterDescriptor(), addr0, mem0, ops->boolean_(true));
    std::ostringstream s0;
    s0 <<*ops;
    
    // Peek at parts of the state that exist
    BaseSemantics::SValuePtr v1 = ops->peekRegister(EAX, ops->undefined_(32));
    ASSERT_always_not_null(v1);
    ASSERT_always_require(v1->must_equal(eax, solver));
    BaseSemantics::SValuePtr mem1 = ops->peekMemory(RegisterDescriptor(), addr0, ops->undefined_(8));
    ASSERT_always_not_null(mem1);
    ASSERT_always_require(mem1->must_equal(mem0, solver));
    std::ostringstream s1;
    s1 <<*ops;
    ASSERT_always_require2(s0.str() == s1.str(), s1.str());

    // Peek at parts of the state that don't exist
    const RegisterDescriptor EBX = *registers->lookup("ebx");
    BaseSemantics::SValuePtr ebx = ops->undefined_(32);
    BaseSemantics::SValuePtr v2 = ops->peekRegister(EBX, ebx);
    ASSERT_always_not_null(v2);
    ASSERT_always_require(v2->must_equal(ebx, solver));
    BaseSemantics::SValuePtr addr2 = ops->number_(32, 0x2000);
    BaseSemantics::SValuePtr mem2init = ops->undefined_(8);
    BaseSemantics::SValuePtr mem2 = ops->peekMemory(RegisterDescriptor(), addr2, mem2init);
    ASSERT_always_not_null(mem2);
    ASSERT_always_require(mem2->must_equal(mem2init, solver));
    std::ostringstream s2;
    s2 <<*ops;
    ASSERT_always_require2(s0.str() == s2.str(), s2.str());

    // Peek at parts of the state that partly exist.
    const RegisterDescriptor RAX = *registers->lookup("rax");
    BaseSemantics::SValuePtr zero64 = ops->number_(64, 0);
    BaseSemantics::SValuePtr v3 = ops->peekRegister(RAX, zero64);
    ASSERT_always_not_null(v3);
    ASSERT_always_require(v3->must_equal(ops->number_(64, 1234), solver));
    BaseSemantics::SValuePtr zero32 = ops->number_(32, 0);
    BaseSemantics::SValuePtr mem3ans = ops->number_(32, 123);
    BaseSemantics::SValuePtr mem3 = ops->peekMemory(RegisterDescriptor(), addr0, zero32);
    ASSERT_always_not_null(mem3);
    ASSERT_always_require(mem3->must_equal(mem3ans, solver));
    std::ostringstream s3;
    s3 <<*ops;
    ASSERT_always_require2(s0.str() == s3.str(), s3.str());

    std::cout <<s3.str();
}