A pcode-based emulator interface. More...

#include <emulate.hh>

Inheritance diagram for ghidra::Emulate:

Public Member Functions
	Emulate (void)
	generic emulator constructor

void	setHalt (bool val)
	Set the halt state of the emulator. More...

bool	getHalt (void) const
	Get the halt state of the emulator. More...

virtual void	setExecuteAddress (const Address &addr)=0
	Set the address of the next instruction to emulate.

virtual Address	getExecuteAddress (void) const =0
	Get the address of the current instruction being executed.

void	executeCurrentOp (void)
	Do a single pcode op step. More...

Protected Member Functions
virtual void	executeUnary (void)=0
	Execute a unary arithmetic/logical operation.

virtual void	executeBinary (void)=0
	Execute a binary arithmetic/logical operation.

virtual void	executeLoad (void)=0
	Standard behavior for a p-code LOAD.

virtual void	executeStore (void)=0
	Standard behavior for a p-code STORE.

virtual void	executeBranch (void)=0
	Standard behavior for a BRANCH. More...

virtual bool	executeCbranch (void)=0
	Check if the conditional of a CBRANCH is true. More...

virtual void	executeBranchind (void)=0
	Standard behavior for a BRANCHIND.

virtual void	executeCall (void)=0
	Standard behavior for a p-code CALL.

virtual void	executeCallind (void)=0
	Standard behavior for a CALLIND.

virtual void	executeCallother (void)=0
	Standard behavior for a user-defined p-code op.

virtual void	executeMultiequal (void)=0
	Standard behavior for a MULTIEQUAL (phi-node)

virtual void	executeIndirect (void)=0
	Standard behavior for an INDIRECT op.

virtual void	executeSegmentOp (void)=0
	Behavior for a SEGMENTOP.

virtual void	executeCpoolRef (void)=0
	Standard behavior for a CPOOLREF (constant pool reference) op.

virtual void	executeNew (void)=0
	Standard behavior for (low-level) NEW op.

virtual void	fallthruOp (void)=0
	Standard p-code fall-thru semantics.

Protected Attributes
bool	emu_halted
	Set to true if the emulator is halted.

OpBehavior *	currentBehave
	Behavior of the next op to execute.

Detailed Description

A pcode-based emulator interface.

The interface expects that the underlying emulation engine operates on individual pcode operations as its atomic operation. The interface allows execution stepping through individual pcode operations. The interface allows querying of the current pcode op, the current machine address, and the rest of the machine state.

Member Function Documentation

◆ executeBranch()

virtual void ghidra::Emulate::executeBranch ( void )

protectedpure virtual

Standard behavior for a BRANCH.

This routine performs a standard p-code BRANCH operation on the memory state. This same routine is used for CBRANCH operations if the condition has evaluated to true.

Implemented in ghidra::EmulatePcodeCache, ghidra::EmulateMemory, ghidra::EmulateSnippet, and ghidra::EmulateFunction.

◆ executeCbranch()

virtual bool ghidra::Emulate::executeCbranch ( void )

protectedpure virtual

Check if the conditional of a CBRANCH is true.

This routine only checks if the condition for a p-code CBRANCH is true. It does not perform the actual branch.

Returns: the boolean state indicated by the condition

Implemented in ghidra::EmulateMemory, ghidra::EmulateSnippet, and ghidra::EmulatePcodeOp.

◆ executeCurrentOp()

void ghidra::Emulate::executeCurrentOp ( void )

Do a single pcode op step.

This method executes a single pcode operation, the current one (returned by getCurrentOp()). The MemoryState of the emulator is queried and changed as needed to accomplish this.

References ghidra::CPUI_BRANCH, ghidra::CPUI_BRANCHIND, ghidra::CPUI_CALL, ghidra::CPUI_CALLIND, ghidra::CPUI_CALLOTHER, ghidra::CPUI_CBRANCH, ghidra::CPUI_CPOOLREF, ghidra::CPUI_INDIRECT, ghidra::CPUI_LOAD, ghidra::CPUI_MULTIEQUAL, ghidra::CPUI_NEW, ghidra::CPUI_RETURN, ghidra::CPUI_SEGMENTOP, and ghidra::CPUI_STORE.

Referenced by ghidra::EmulateFunction::emulatePath(), ghidra::ExecutablePcode::evaluate(), and ghidra::EmulatePcodeCache::executeInstruction().

◆ getHalt()

bool ghidra::Emulate::getHalt ( void ) const

inline

Get the halt state of the emulator.

Applications and breakpoints can use this method and its companion setHalt() to terminate and restart the main emulator loop as needed. The emulator itself makes no use of this routine or the associated state variable emu_halted.

Returns: true if the emulator is in a "halted" state.

Referenced by ghidra::ExecutablePcode::evaluate().

◆ setHalt()

void ghidra::Emulate::setHalt ( bool val )

inline

Set the halt state of the emulator.

Applications and breakpoints can use this method and its companion getHalt() to terminate and restart the main emulator loop as needed. The emulator itself makes no use of this routine or the associated state variable emu_halted.

Parameters

val	is what the halt state of the emulator should be set to

The documentation for this class was generated from the following files:

emulate.hh
emulate.cc

Public Member Functions

Protected Member Functions