Description
Basic semantic operations.
Each operation builds a new AST by creating a new node and attaching existing children to that node. The parent pointers of the children are not updated, and as described in SValue, therefore do not form proper ROSE abstract syntax trees.
The writeRegister, writeMemory, and a handful of other operators that represent instruction side effects are inserted into the instruction's list of static sematics. This is the point at which this semantic domain takes an improperly formed ROSE AST from an SValue and fixes it so it has proper parent pointers and does not share nodes with other subtrees.
Definition at line 245 of file StaticSemantics2.h.
#include <StaticSemantics2.h>
Public Member Functions | |
| virtual BaseSemantics::RiscOperatorsPtr | create (const BaseSemantics::SValuePtr &protoval, const SmtSolverPtr &solver=SmtSolverPtr()) const ROSE_OVERRIDE |
| Virtual allocating constructor. More... | |
| virtual BaseSemantics::RiscOperatorsPtr | create (const BaseSemantics::StatePtr &state, const SmtSolverPtr &solver=SmtSolverPtr()) const ROSE_OVERRIDE |
| Virtual allocating constructor. More... | |
| virtual void | startInstruction (SgAsmInstruction *) ROSE_OVERRIDE |
| Called at the beginning of every instruction. More... | |
| virtual BaseSemantics::SValuePtr | filterCallTarget (const BaseSemantics::SValuePtr &a) ROSE_OVERRIDE |
| Invoked to filter call targets. More... | |
| virtual BaseSemantics::SValuePtr | filterReturnTarget (const BaseSemantics::SValuePtr &a) ROSE_OVERRIDE |
| Invoked to filter return targets. More... | |
| virtual BaseSemantics::SValuePtr | filterIndirectJumpTarget (const BaseSemantics::SValuePtr &a) ROSE_OVERRIDE |
| Invoked to filter indirect jumps. More... | |
| virtual void | hlt () ROSE_OVERRIDE |
| Invoked for the x86 HLT instruction. More... | |
| virtual void | cpuid () ROSE_OVERRIDE |
| Invoked for the x86 CPUID instruction. More... | |
| virtual BaseSemantics::SValuePtr | rdtsc () ROSE_OVERRIDE |
| Invoked for the x86 RDTSC instruction. More... | |
| virtual BaseSemantics::SValuePtr | and_ (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Computes bit-wise AND of two values. More... | |
| virtual BaseSemantics::SValuePtr | or_ (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Computes bit-wise OR of two values. More... | |
| virtual BaseSemantics::SValuePtr | xor_ (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Computes bit-wise XOR of two values. More... | |
| virtual BaseSemantics::SValuePtr | invert (const BaseSemantics::SValuePtr &a_) ROSE_OVERRIDE |
| One's complement. More... | |
| virtual BaseSemantics::SValuePtr | extract (const BaseSemantics::SValuePtr &a_, size_t begin_bit, size_t end_bit) ROSE_OVERRIDE |
| Extracts bits from a value. More... | |
| virtual BaseSemantics::SValuePtr | concat (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Concatenates the bits of two values. More... | |
| virtual BaseSemantics::SValuePtr | leastSignificantSetBit (const BaseSemantics::SValuePtr &a_) ROSE_OVERRIDE |
| Returns position of least significant set bit; zero when no bits are set. More... | |
| virtual BaseSemantics::SValuePtr | mostSignificantSetBit (const BaseSemantics::SValuePtr &a_) ROSE_OVERRIDE |
| Returns position of most significant set bit; zero when no bits are set. More... | |
| virtual BaseSemantics::SValuePtr | rotateLeft (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &sa_) ROSE_OVERRIDE |
| Rotate bits to the left. More... | |
| virtual BaseSemantics::SValuePtr | rotateRight (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &sa_) ROSE_OVERRIDE |
| Rotate bits to the right. More... | |
| virtual BaseSemantics::SValuePtr | shiftLeft (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &sa_) ROSE_OVERRIDE |
| Returns arg shifted left. More... | |
| virtual BaseSemantics::SValuePtr | shiftRight (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &sa_) ROSE_OVERRIDE |
| Returns arg shifted right logically (no sign bit). More... | |
| virtual BaseSemantics::SValuePtr | shiftRightArithmetic (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &sa_) ROSE_OVERRIDE |
| Returns arg shifted right arithmetically (with sign bit). More... | |
| virtual BaseSemantics::SValuePtr | equalToZero (const BaseSemantics::SValuePtr &a_) ROSE_OVERRIDE |
| Determines whether a value is equal to zero. More... | |
| virtual BaseSemantics::SValuePtr | ite (const BaseSemantics::SValuePtr &sel_, const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| If-then-else. More... | |
| virtual BaseSemantics::SValuePtr | isEqual (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &) ROSE_OVERRIDE |
| Equality comparison. More... | |
| virtual BaseSemantics::SValuePtr | isNotEqual (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &) ROSE_OVERRIDE |
| Equality comparison. More... | |
| virtual BaseSemantics::SValuePtr | isUnsignedLessThan (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &) ROSE_OVERRIDE |
| Comparison for unsigned values. More... | |
| virtual BaseSemantics::SValuePtr | isUnsignedLessThanOrEqual (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &) ROSE_OVERRIDE |
| Comparison for unsigned values. More... | |
| virtual BaseSemantics::SValuePtr | isUnsignedGreaterThan (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &) ROSE_OVERRIDE |
| Comparison for unsigned values. More... | |
| virtual BaseSemantics::SValuePtr | isUnsignedGreaterThanOrEqual (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &) ROSE_OVERRIDE |
| Comparison for unsigned values. More... | |
| virtual BaseSemantics::SValuePtr | isSignedLessThan (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &) ROSE_OVERRIDE |
| Comparison for signed values. More... | |
| virtual BaseSemantics::SValuePtr | isSignedLessThanOrEqual (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &) ROSE_OVERRIDE |
| Comparison for signed values. More... | |
| virtual BaseSemantics::SValuePtr | isSignedGreaterThan (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &) ROSE_OVERRIDE |
| Comparison for signed values. More... | |
| virtual BaseSemantics::SValuePtr | isSignedGreaterThanOrEqual (const BaseSemantics::SValuePtr &, const BaseSemantics::SValuePtr &) ROSE_OVERRIDE |
| Comparison for signed values. More... | |
| virtual BaseSemantics::SValuePtr | unsignedExtend (const BaseSemantics::SValuePtr &a_, size_t new_width) ROSE_OVERRIDE |
Extend (or shrink) operand a so it is nbits wide by adding or removing high-order bits. More... | |
| virtual BaseSemantics::SValuePtr | signExtend (const BaseSemantics::SValuePtr &a_, size_t new_width) ROSE_OVERRIDE |
| Sign extends a value. More... | |
| virtual BaseSemantics::SValuePtr | add (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Adds two integers of equal size. More... | |
| virtual BaseSemantics::SValuePtr | subtract (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Subtract one value from another. More... | |
| virtual BaseSemantics::SValuePtr | addWithCarries (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_, const BaseSemantics::SValuePtr &c_, BaseSemantics::SValuePtr &carry_out) ROSE_OVERRIDE |
| Add two values of equal size and a carry bit. More... | |
| virtual BaseSemantics::SValuePtr | negate (const BaseSemantics::SValuePtr &a_) ROSE_OVERRIDE |
| Two's complement. More... | |
| virtual BaseSemantics::SValuePtr | signedDivide (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Divides two signed values. More... | |
| virtual BaseSemantics::SValuePtr | signedModulo (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Calculates modulo with signed values. More... | |
| virtual BaseSemantics::SValuePtr | signedMultiply (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Multiplies two signed values. More... | |
| virtual BaseSemantics::SValuePtr | unsignedDivide (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Divides two unsigned values. More... | |
| virtual BaseSemantics::SValuePtr | unsignedModulo (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Calculates modulo with unsigned values. More... | |
| virtual BaseSemantics::SValuePtr | unsignedMultiply (const BaseSemantics::SValuePtr &a_, const BaseSemantics::SValuePtr &b_) ROSE_OVERRIDE |
| Multiply two unsigned values. More... | |
| virtual void | interrupt (int majr, int minr) ROSE_OVERRIDE |
| Invoked for instructions that cause an interrupt. More... | |
| virtual BaseSemantics::SValuePtr | readRegister (RegisterDescriptor reg, const BaseSemantics::SValuePtr &dflt) ROSE_OVERRIDE |
| Reads a value from a register. More... | |
| virtual BaseSemantics::SValuePtr | peekRegister (RegisterDescriptor reg, const BaseSemantics::SValuePtr &dflt) ROSE_OVERRIDE |
| Obtain a register value without side effects. More... | |
| virtual void | writeRegister (RegisterDescriptor reg, const BaseSemantics::SValuePtr &a) ROSE_OVERRIDE |
| Writes a value to a register. More... | |
| virtual BaseSemantics::SValuePtr | readMemory (RegisterDescriptor segreg, const BaseSemantics::SValuePtr &addr, const BaseSemantics::SValuePtr &dflt, const BaseSemantics::SValuePtr &cond) ROSE_OVERRIDE |
| Reads a value from memory. More... | |
| virtual BaseSemantics::SValuePtr | peekMemory (RegisterDescriptor segreg, const BaseSemantics::SValuePtr &addr, const BaseSemantics::SValuePtr &dflt) ROSE_OVERRIDE |
| Read memory without side effects. More... | |
| virtual void | writeMemory (RegisterDescriptor segreg, const BaseSemantics::SValuePtr &addr, const BaseSemantics::SValuePtr &data, const BaseSemantics::SValuePtr &cond) ROSE_OVERRIDE |
| Writes a value to memory. More... | |
 Public Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators | |
| virtual SValuePtr | protoval () const |
| Property: Prototypical semantic value. More... | |
| virtual SgAsmInstruction * | currentInstruction () const |
| Returns current instruction. More... | |
| virtual void | finishInstruction (SgAsmInstruction *insn) |
| Called at the end of every instruction. More... | |
| virtual SValuePtr | undefined_ (size_t nbits) |
| Returns a new undefined value. More... | |
| virtual SValuePtr | unspecified_ (size_t nbits) |
| virtual SValuePtr | number_ (size_t nbits, uint64_t value) |
| Returns a number of the specified bit width. More... | |
| virtual SValuePtr | boolean_ (bool value) |
| Returns a Boolean value. More... | |
| virtual SValuePtr | bottom_ (size_t nbits) |
| Returns a data-flow bottom value. More... | |
| virtual SValuePtr | fpFromInteger (const SValuePtr &intValue, SgAsmFloatType *fpType) |
| Construct a floating-point value from an integer value. More... | |
| virtual SValuePtr | fpToInteger (const SValuePtr &fpValue, SgAsmFloatType *fpType, const SValuePtr &dflt) |
| Construct an integer value from a floating-point value. More... | |
| virtual SValuePtr | fpConvert (const SValuePtr &a, SgAsmFloatType *aType, SgAsmFloatType *retType) |
| Convert from one floating-point type to another. More... | |
| virtual SValuePtr | fpIsNan (const SValuePtr &fpValue, SgAsmFloatType *fpType) |
| Whether a floating-point value is a special not-a-number bit pattern. More... | |
| virtual SValuePtr | fpIsDenormalized (const SValuePtr &fpValue, SgAsmFloatType *fpType) |
| Whether a floating-point value is denormalized. More... | |
| virtual SValuePtr | fpIsZero (const SValuePtr &fpValue, SgAsmFloatType *fpType) |
| Whether a floating-point value is equal to zero. More... | |
| virtual SValuePtr | fpIsInfinity (const SValuePtr &fpValue, SgAsmFloatType *fpType) |
| Whether a floating-point value is infinity. More... | |
| virtual SValuePtr | fpSign (const SValuePtr &fpValue, SgAsmFloatType *fpType) |
| Sign of floating-point value. More... | |
| virtual SValuePtr | fpEffectiveExponent (const SValuePtr &fpValue, SgAsmFloatType *fpType) |
| Exponent of floating-point value. More... | |
| virtual SValuePtr | fpAdd (const SValuePtr &a, const SValuePtr &b, SgAsmFloatType *fpType) |
| Add two floating-point values. More... | |
| virtual SValuePtr | fpSubtract (const SValuePtr &a, const SValuePtr &b, SgAsmFloatType *fpType) |
| Subtract one floating-point value from another. More... | |
| virtual SValuePtr | fpMultiply (const SValuePtr &a, const SValuePtr &b, SgAsmFloatType *fpType) |
| Multiply two floating-point values. More... | |
| virtual SValuePtr | fpDivide (const SValuePtr &a, const SValuePtr &b, SgAsmFloatType *fpType) |
| Divide one floating-point value by another. More... | |
| virtual SValuePtr | fpSquareRoot (const SValuePtr &a, SgAsmFloatType *fpType) |
| Square root. More... | |
| virtual SValuePtr | fpRoundTowardZero (const SValuePtr &a, SgAsmFloatType *fpType) |
| Round toward zero. More... | |
| virtual SmtSolverPtr | solver () const |
| Property: Satisfiability module theory (SMT) solver. More... | |
| virtual void | solver (const SmtSolverPtr &s) |
| Property: Satisfiability module theory (SMT) solver. More... | |
| virtual StatePtr | currentState () const |
| Property: Current semantic state. More... | |
| virtual void | currentState (const StatePtr &s) |
| Property: Current semantic state. More... | |
| virtual StatePtr | initialState () const |
| Property: Optional lazily updated initial state. More... | |
| virtual void | initialState (const StatePtr &s) |
| Property: Optional lazily updated initial state. More... | |
| virtual const std::string & | name () const |
| Property: Name used for debugging. More... | |
| virtual void | name (const std::string &s) |
| Property: Name used for debugging. More... | |
| void | print (std::ostream &stream, const std::string prefix="") const |
| Print multi-line output for this object. | |
| virtual void | print (std::ostream &stream, Formatter &fmt) const |
| Print multi-line output for this object. | |
| WithFormatter | with_format (Formatter &fmt) |
| Used for printing RISC operators with formatting. More... | |
| WithFormatter | operator+ (Formatter &fmt) |
| Used for printing RISC operators with formatting. More... | |
| virtual size_t | nInsns () const |
| Property: Number of instructions processed. More... | |
| virtual void | nInsns (size_t n) |
| Property: Number of instructions processed. More... | |
| virtual SValuePtr | readRegister (RegisterDescriptor reg) |
| Reads a value from a register. More... | |
| SValuePtr | peekRegister (RegisterDescriptor reg) |
| Obtain a register value without side effects. More... | |
Static Public Member Functions | |
| static RiscOperatorsPtr | instance (const RegisterDictionary *regdict, const SmtSolverPtr &solver=SmtSolverPtr()) |
| Instantiates a new RiscOperators object and configures it to use semantic values and states that are defaults for StaticSemantics. More... | |
| static RiscOperatorsPtr | instance (const BaseSemantics::SValuePtr &protoval, const SmtSolverPtr &solver=SmtSolverPtr()) |
| Instantiates a new RiscOperators object with specified prototypical values. More... | |
| static RiscOperatorsPtr | instance (const BaseSemantics::StatePtr &state, const SmtSolverPtr &solver=SmtSolverPtr()) |
| Instantiates a new RiscOperators object with specified state. More... | |
| static RiscOperatorsPtr | promote (const BaseSemantics::RiscOperatorsPtr &x) |
| Run-time promotion of a base RiscOperators pointer to static operators. More... | |
| Static Public Member Functions inherited from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators | |
| static RiscOperatorsPtr | promote (const RiscOperatorsPtr &x) |
Additional Inherited Members | |
| Public Types inherited from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators | |
| typedef RiscOperatorsPtr | Ptr |
| Shared-ownership pointer for a RiscOperators object. More... | |
Member Function Documentation
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inlinestatic |
Instantiates a new RiscOperators object and configures it to use semantic values and states that are defaults for StaticSemantics.
Definition at line 262 of file StaticSemantics2.h.
References Rose::BinaryAnalysis::InstructionSemantics2::StaticSemantics::SValue::instance(), and Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::State::instance().
Referenced by create().
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inlinestatic |
Instantiates a new RiscOperators object with specified prototypical values.
An SMT solver may be specified as the second argument because the base class expects one, but it is not used for static semantics. See solver for details.
Definition at line 273 of file StaticSemantics2.h.
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Instantiates a new RiscOperators object with specified state.
An SMT solver may be specified as the second argument because the base class expects one, but it is not used for static semantics. See solver for details.
Definition at line 279 of file StaticSemantics2.h.
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Virtual allocating constructor.
The protoval is a prototypical semantic value that is used as a factory to create additional values as necessary via its virtual constructors. The state upon which the RISC operations operate must be set by modifying the currentState property. An optional SMT solver may be specified (see solver).
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
Definition at line 286 of file StaticSemantics2.h.
References instance().
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Virtual allocating constructor.
The supplied state is that upon which the RISC operations operate and is also used to define the prototypical semantic value. Other states can be supplied by setting currentState. The prototypical semantic value is used as a factory to create additional values as necessary via its virtual constructors. An optional SMT solver may be specified (see solver).
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
Definition at line 291 of file StaticSemantics2.h.
References instance().
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Run-time promotion of a base RiscOperators pointer to static operators.
This is a checked conversion–it will fail if x does not point to a StaticSemantics::RiscOperators object.
Definition at line 301 of file StaticSemantics2.h.
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Save instruction side effect.
Any semantic value which is an ultimate side effect of an instruction must get saved as a subtree of the instruction node in the AST. This is the point at which the improperly formed SValue AST gets transformed into an AST that follows ROSE's rules for an AST, namely, a parent property that points to the parent in the AST and thus no sharing of nodes between subtrees.
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Called at the beginning of every instruction.
This method is invoked every time the translation object begins processing an instruction. Some policies use this to update a pointer to the current instruction.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Invoked to filter call targets.
This method is called whenever the translation object is about to invoke a function call. The target address is passed as an argument and a (new) target should be returned.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Invoked to filter return targets.
This method is called whenever the translation object is about to return from a function call (such as for the x86 "RET" instruction). The return address is passed as an argument and a (new) return address should be returned.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Invoked to filter indirect jumps.
This method is called whenever the translation object is about to unconditionally jump to a new address (such as for the x86 "JMP" instruction). The target address is passed as an argument and a (new) target address should be returned.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Invoked for the x86 HLT instruction.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Invoked for the x86 CPUID instruction.
FIXME: x86-specific stuff should be in the dispatcher.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Invoked for the x86 RDTSC instruction.
FIXME: x86-specific stuff should be in the dispatcher.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Computes bit-wise AND of two values.
The operands must both have the same width; the result must be the same width as the operands.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Computes bit-wise OR of two values.
The operands a and b must have the same width; the return value width will be the same as a and b.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Computes bit-wise XOR of two values.
The operands a and b must have the same width; the result will be the same width as a and b.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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One's complement.
The result will be the same size as the operand.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Extracts bits from a value.
The specified bits from begin_bit (inclusive) through end_bit (exclusive) are copied into the low-order bits of the return value (other bits in the return value are cleared). The least significant bit is number zero. The begin_bit and end_bit values must be valid for the width of a.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Concatenates the bits of two values.
The bits of a and b are concatenated so that the result has b in the high-order bits and a in the low order bits. The width of the return value is the sum of the widths of a and b.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Returns position of least significant set bit; zero when no bits are set.
The return value will have the same width as the operand, although this can be safely truncated to the log-base-2 + 1 width.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Returns position of most significant set bit; zero when no bits are set.
The return value will have the same width as the operand, although this can be safely truncated to the log-base-2 + 1 width.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Rotate bits to the left.
The return value will have the same width as operand a. The nbits is interpreted as unsigned. The behavior is modulo the width of a regardles of whether the implementation makes that a special case or handles it naturally.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Rotate bits to the right.
The return value will have the same width as operand a. The nbits is interpreted as unsigned. The behavior is modulo the width of a regardles of whether the implementation makes that a special case or handles it naturally.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Returns arg shifted left.
The return value will have the same width as operand a. The nbits is interpreted as unsigned. New bits shifted into the value are zero. If nbits is equal to or larger than the width of a then the result is zero.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Returns arg shifted right logically (no sign bit).
The return value will have the same width as operand a. The nbits is interpreted as unsigned. New bits shifted into the value are zero. If nbits is equal to or larger than the width of a then the result is zero.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Returns arg shifted right arithmetically (with sign bit).
The return value will have the same width as operand a. The nbits is interpreted as unsigned. New bits shifted into the value are the same as the most significant bit (the "sign bit"). If nbits is equal to or larger than the width of a then the result has all bits cleared or all bits set depending on whether the most significant bit was originally clear or set.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Determines whether a value is equal to zero.
Returns true, false, or undefined (in the semantic domain) depending on whether argument is zero.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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If-then-else.
Returns operand a if cond is true, operand b if cond is false, or some other value if the condition is unknown. The condition must be one bit wide; the widths of a and b must be equal; the return value width will be the same as a and b.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Equality comparison.
Returns a Boolean to indicate whether the relationship between a and b holds. Both operands must be the same width. It doesn't matter if they are interpreted as signed or unsigned quantities.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Equality comparison.
Returns a Boolean to indicate whether the relationship between a and b holds. Both operands must be the same width. It doesn't matter if they are interpreted as signed or unsigned quantities.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Comparison for unsigned values.
Returns a Boolean to indicate whether the relationship between a and b is true when a and b are interpreted as unsigned values. Both values must have the same width. This operation is a convenience wrapper around other RISC operators.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Comparison for unsigned values.
Returns a Boolean to indicate whether the relationship between a and b is true when a and b are interpreted as unsigned values. Both values must have the same width. This operation is a convenience wrapper around other RISC operators.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Comparison for unsigned values.
Returns a Boolean to indicate whether the relationship between a and b is true when a and b are interpreted as unsigned values. Both values must have the same width. This operation is a convenience wrapper around other RISC operators.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Comparison for unsigned values.
Returns a Boolean to indicate whether the relationship between a and b is true when a and b are interpreted as unsigned values. Both values must have the same width. This operation is a convenience wrapper around other RISC operators.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Comparison for signed values.
Returns a Boolean to indicate whether the relationship between a and b is true when a and b are interpreted as signed values. Both values must have the same width. This operation is a convenience wrapper around other RISC operators.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Comparison for signed values.
Returns a Boolean to indicate whether the relationship between a and b is true when a and b are interpreted as signed values. Both values must have the same width. This operation is a convenience wrapper around other RISC operators.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Comparison for signed values.
Returns a Boolean to indicate whether the relationship between a and b is true when a and b are interpreted as signed values. Both values must have the same width. This operation is a convenience wrapper around other RISC operators.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Comparison for signed values.
Returns a Boolean to indicate whether the relationship between a and b is true when a and b are interpreted as signed values. Both values must have the same width. This operation is a convenience wrapper around other RISC operators.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Extend (or shrink) operand a so it is nbits wide by adding or removing high-order bits.
Added bits are always zeros. The result will be the specified new_width.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Sign extends a value.
The result will the the specified new_width, which must be at least as large as the original width.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Adds two integers of equal size.
The width of a and b must be equal; the return value will have the same width as a and b.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Subtract one value from another.
This is not a virtual function because it can be implemented in terms of add and negate. We define it because it's something that occurs often enough to warrant its own function.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Add two values of equal size and a carry bit.
Carry information is returned via carry_out argument. The carry_out value is the tick marks that are written above the first addend when doing long arithmetic like a 2nd grader would do (of course, they'd probably be adding two base-10 numbers). For instance, when adding 00110110 and 11100100:
The carry_out value is 11100100.
The width of a and b must be equal; c must have a width of one bit; the return value and carry_out will be the same width as a and b. The carry_out value is allocated herein.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Two's complement.
The return value will have the same width as the operand.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Divides two signed values.
The width of the result will be the same as the width of operand a.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Calculates modulo with signed values.
The width of the result will be the same as the width of operand b.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Multiplies two signed values.
The width of the result will be the sum of the widths of a and b.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Divides two unsigned values.
The width of the result is the same as the width of operand a.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Calculates modulo with unsigned values.
The width of the result is the same as the width of operand b.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Multiply two unsigned values.
The width of the result is the sum of the widths of a and b.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Invoked for instructions that cause an interrupt.
The major and minor numbers are architecture specific. For instance, an x86 INT instruction uses major number zero and the minor number is the interrupt number (e.g., 0x80 for Linux system calls), while an x86 SYSENTER instruction uses major number one. The minr operand for INT3 is -3 to distinguish it from the one-argument "INT 3" instruction which has slightly different semantics.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Reads a value from a register.
The base implementation simply delegates to the current semantic State, which probably delegates to a register state, but subclasses are welcome to override this behavior at any level.
A register state will typically implement storage for hardware registers, but higher layers (the State, RiscOperators, Dispatcher, ...) should not be concerned about the size of the register they're trying to read. For example, a register state for a 32-bit x86 architecture will likely have a storage location for the 32-bit EAX register, but it should be possible to ask readRegister to return the value of AX (the low-order 16-bits). In order to accomplish this, some level of the readRegister delegations needs to invoke extract to obtain the low 16 bits. The RiscOperators object is passed along the delegation path for this purpose. The inverse concat operation will be needed at some level when we ask readRegister to return a value that comes from multiple storage locations in the register state (such as can happen if an x86 register state holds individual status flags and we ask for the 32-bit EFLAGS register).
If the register state can distinguish between a register that has never been accessed and a register that has only been read, then the dflt value is stored into the register the first time it's read. This ensures that reading the register a second time with no intervening write will return the same value as the first read. If a dflt is not provided then one is constructed by invoking undefined_.
There needs to be a certain level of cooperation between the RiscOperators, State, and register state classes to decide which layer should invoke the extract or concat (or whatever other RISC operations might be necessary).
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Obtain a register value without side effects.
This is a lower-level operation than readRegister in that it doesn't cause the register to be marked as having been read. It is typically used in situations where the register is being accessed for analysis purposes rather than as part of an instruction emulation.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Writes a value to a register.
The base implementation simply delegates to the current semantic State, which probably delegates to a register state, but subclasses are welcome to override this behavior at any level.
As with readRegister, writeRegister may need to perform various RISC operations in order to accomplish the task of writing a value to the specified register when the underlying register state doesn't actually store a value for that specific register. The RiscOperations object is passed along for that purpose. See readRegister for more details.
Reimplemented from Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Reads a value from memory.
The implementation (in subclasses) will typically delegate much of the work to the current state's readMemory method.
A MemoryState will implement storage for memory locations and might impose certain restrictions, such as "all memory values must be eight bits". However, the readMemory should not have these constraints so that it can be called from a variety of Dispatcher subclass (e.g., the DispatcherX86 class assumes that readMemory is capable of reading 32-bit values from little-endian memory). The designers of the MemoryState, State, and RiscOperators should collaborate to decide which layer (RiscOperators, State, or MemoryState) is reponsible for combining individual memory locations into larger values. A RiscOperators object is passed along the chain of delegations for this purpose. The RiscOperators might also contain other data that's import during the process, such as an SMT solver.
The segreg argument is an optional segment register. Most architectures have a flat virtual address space and will pass a default-constructed register descriptor whose is_valid() method returns false.
The cond argument is a Boolean value that indicates whether this is a true read operation. If cond can be proven to be false then the read is a no-op and returns an arbitrary value.
The dflt argument determines the size of the value to be read. This argument is also passed along to the lower layers so that they can, if they desire, use it to initialize memory that has never been read or written before.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Read memory without side effects.
This is a lower-level operation than readMemory in that it doesn't cause any side effects in the memory state. In all other respects, it's similar to readMemory.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
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Writes a value to memory.
The implementation (in subclasses) will typically delegate much of the work to the current state's writeMemory method.
The segreg argument is an optional segment register. Most architectures have a flat virtual address space and will pass a default-constructed register descriptor whose is_valid() method returns false.
The cond argument is a Boolean value that indicates whether this is a true write operation. If cond can be proved to be false then writeMemory is a no-op.
Implements Rose::BinaryAnalysis::InstructionSemantics2::BaseSemantics::RiscOperators.
The documentation for this class was generated from the following file:
