Package ghidra.app.plugin.assembler.sleigh.expr

Class ContextFieldSolver

java.lang.Object

ghidra.app.plugin.assembler.sleigh.expr.AbstractExpressionSolver<ContextField>

ghidra.app.plugin.assembler.sleigh.expr.ContextFieldSolver

public class ContextFieldSolver
extends AbstractExpressionSolver<ContextField>

Solves expressions of a context register field

Essentially, this just encodes the goal into the field, if it can be represented in the given space and format. Otherwise, there is no solution.

Field Summary

Fields inherited from class ghidra.app.plugin.assembler.sleigh.expr.AbstractExpressionSolver

dbg, solver

Constructor Summary

Constructors

Constructor	Description
ContextFieldSolver()

Method Summary

Modifier and Type	Method	Description
int	getInstructionLength(ContextField cf)	Determines the length of the subconstructor that would be returned had the expression not depended on an undefined symbol.
MaskedLong	getValue(ContextField cf, Map<String,Long> vals, AssemblyResolvedPatterns cur)	Attempt to get a constant value for the expression
AssemblyResolution	solve(AbstractAssemblyResolutionFactory<?,?> factory, ContextField cf, MaskedLong goal, Map<String,Long> vals, AssemblyResolvedPatterns cur, Set<SolverHint> hints, String description)	Attempt to solve an expression for a given value
MaskedLong	valueForResolution(ContextField cf, Map<String,Long> vals, AssemblyResolvedPatterns rc)	Compute the value of the expression given the (possibly-intermediate) resolution

Methods inherited from class ghidra.app.plugin.assembler.sleigh.expr.AbstractExpressionSolver

register

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ContextFieldSolver

public ContextFieldSolver()

Method Details

solve

public AssemblyResolution solve(AbstractAssemblyResolutionFactory<?,?> factory,
 ContextField cf,
 MaskedLong goal,
 Map<String,Long> vals,
 AssemblyResolvedPatterns cur,
 Set<SolverHint> hints,
 String description)

Description copied from class: AbstractExpressionSolver

Attempt to solve an expression for a given value

Specified by:

solve in class AbstractExpressionSolver<ContextField>

cf - the expression to solve

goal - the desired value of the expression

vals - values of defined symbols

hints - describes techniques applied by calling solvers

description - the description to give to resolved solutions

Returns:

the resolution

getValue

public MaskedLong getValue(ContextField cf,
 Map<String,Long> vals,
 AssemblyResolvedPatterns cur)

Description copied from class: AbstractExpressionSolver

Attempt to get a constant value for the expression

Specified by:

getValue in class AbstractExpressionSolver<ContextField>

Parameters:

cf - the expression

vals - values of defined symbols

Returns:

the constant value, or null if it depends on a variable

getInstructionLength

public int getInstructionLength(ContextField cf)

Description copied from class: AbstractExpressionSolver

Determines the length of the subconstructor that would be returned had the expression not depended on an undefined symbol.

This is used by the backfilling process to ensure values are written to the correct offset

Specified by:

getInstructionLength in class AbstractExpressionSolver<ContextField>

Parameters:

cf - the expression

Returns:

the length of filled in token field(s).

valueForResolution

public MaskedLong valueForResolution(ContextField cf,
 Map<String,Long> vals,
 AssemblyResolvedPatterns rc)

Description copied from class: AbstractExpressionSolver

Compute the value of the expression given the (possibly-intermediate) resolution

Specified by:

valueForResolution in class AbstractExpressionSolver<ContextField>

Parameters:

cf - the expression to evaluate

vals - values of defined symbols

rc - the resolution on which to evaluate it

Returns:

the result