Package ghidra.program.disassemble
Class Disassembler
- java.lang.Object
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- ghidra.program.disassemble.Disassembler
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- All Implemented Interfaces:
DisassemblerConflictHandler
public class Disassembler extends java.lang.Object implements DisassemblerConflictHandler
Class to perform disassembly. Contains the logic to follow instruction flows to continue the disassembly. 17-Nov-2008: moved to ghidra.program.disassemble package since this is now used during language upgrades which may occur during construction of ProgramDB. 12-Dec-2012: major refactor of disassembly to perform bulk add of instructions to program to avoid context related conflicts
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected class
Disassembler.DisassemblerProgramContext
DisassemblerProgramContext
is used as a proxy program context due to the delayed nature of laying down instructions and their associated context state.
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Field Summary
Fields Modifier and Type Field Description protected AddressFactory
addrFactory
protected Register
baseContextRegister
protected BookmarkManager
bmMgr
protected DisassemblerContextImpl
disassemblerContext
protected Disassembler.DisassemblerProgramContext
disassemblerProgramContext
protected boolean
doMarkBadInstructions
static java.lang.String
ERROR_BOOKMARK_CATEGORY
protected Language
language
static java.lang.String
MARK_BAD_INSTRUCTION_PROPERTY
MARK_BAD_INSTRUCTION_PROPERTY
Program Disassembler property enables marking of instruction disassembly errors.static java.lang.String
MARK_UNIMPL_PCODE_PROPERTY
MARK_UNIMPL_PCODE_PROPERTY
Program Disassembler property enables marking of instructions which are missing their pcode implementation.static int
MAX_REPEAT_PATTERN_LENGTH
protected ParallelInstructionLanguageHelper
parallelHelper
static java.lang.String
RESTRICT_DISASSEMBLY_TO_EXECUTE_MEMORY_PROPERTY
RESTRICT_DISASSEMBLY_TO_EXECUTE_MEMORY_PROPERTY
Program Disassembler property restricts disassembly to executable memory only.static java.lang.String
UNIMPL_BOOKMARK_CATEGORY
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Constructor Summary
Constructors Modifier Constructor Description protected
Disassembler(Language language, AddressFactory addrFactory, TaskMonitor monitor, DisassemblerMessageListener listener)
Disassembler constructor.protected
Disassembler(Program program, boolean markBadInstructions, boolean markUnimplementedPcode, boolean restrictToExecuteMemory, TaskMonitor monitor, DisassemblerMessageListener listener)
Disassembler constructorprotected
Disassembler(Program program, TaskMonitor monitor, DisassemblerMessageListener listener)
Disassembler constructor.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description protected void
adjustPreParseContext(MemBuffer instrMemBuffer)
Adjust disassembler context prior to disassembly of a new instruction.static void
clearUnimplementedPcodeWarnings(Program program, AddressSetView addressSet, TaskMonitor monitor)
Clear all bookmarks which indicate unimplemented pcode within the specified address set.AddressSet
disassemble(Address startAddr, AddressSetView restrictedSet)
Disassembles code starting at startAddr and restricted to addrSet.AddressSet
disassemble(Address startAddr, AddressSetView restrictedSet, boolean doFollowFlow)
Disassembles code starting at startAddr and restricted to addrSet.AddressSet
disassemble(Address startAddr, AddressSetView restrictedSet, RegisterValue initialContextValue, boolean doFollowFlow)
Disassembles code starting at startAddr and restricted to addrSet.AddressSet
disassemble(AddressSetView startSet, AddressSetView restrictedSet, boolean doFollowFlow)
Attempt disassembly of all undefined code units within the specified set of addresses.AddressSet
disassemble(AddressSetView startSet, AddressSetView restrictedSet, RegisterValue initialContextValue, boolean doFollowFlow)
Attempt disassembly of all undefined code units within the specified set of addresses.protected void
disassembleInstructionBlock(InstructionBlock block, MemBuffer blockMemBuffer, Address flowFrom, int limit, InstructionSet instructionSet, boolean skipIfBlockAlreadyDisassembled)
static Disassembler
getDisassembler(Language language, AddressFactory addrFactory, TaskMonitor monitor, DisassemblerMessageListener listener)
Get a suitable disassembler instance.static Disassembler
getDisassembler(Program program, boolean markBadInstructions, boolean markUnimplementedPcode, boolean restrictToExecuteMemory, TaskMonitor monitor, DisassemblerMessageListener listener)
Get a suitable disassembler instance.static Disassembler
getDisassembler(Program program, TaskMonitor monitor, DisassemblerMessageListener listener)
Get a suitable disassembler instance.protected PseudoInstruction
getPseudoInstruction(Address addr, InstructionPrototype prototype, MemBuffer memBuffer, RegisterValue contextValue, InstructionBlock block)
protected boolean
isBlockTerminationOK(Instruction instr)
static boolean
isMarkBadDisassemblyOptionEnabled(Program program)
static boolean
isMarkUnimplementedPcodeOptionEnabled(Program program)
static boolean
isRestrictToExecuteMemory(Program program)
void
markInstructionError(InstructionError conflict)
static void
markUnimplementedPcode(Program program, AddressSetView addressSet, TaskMonitor monitor)
Mark all instructions with unimplemented pcode over the specified address setprotected Address
processInstruction(PseudoInstruction inst, MemBuffer blockMemBuffer, InstructionBlock block, InstructionSet instructionSet)
Process a new instruction which has just been parsed.InstructionBlock
pseudoDisassembleBlock(Address addr, RegisterValue defaultContextValue, int limit)
Perform a psuedo-disassembly of an single instruction block only following fall-throughs.InstructionBlock
pseudoDisassembleBlock(MemBuffer blockMemBuffer, RegisterValue defaultContextValue, int limit)
Perform a psuedo-disassembly of an single instruction block only following fall-throughs.void
resetDisassemblerContext()
Clear any retained context state which may have been accumulated.void
setRepeatPatternLimit(int maxInstructions)
Set the maximum number of instructions in a single run which contain the same byte values.void
setRepeatPatternLimitIgnored(AddressSetView set)
Set the region over which the repeat pattern limit will be ignored.void
setSeedContext(DisassemblerContextImpl seedContext)
Set seed context which will be used to establish initial context at starting points which are not arrived at via a natural disassembly flow.
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Field Detail
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MARK_BAD_INSTRUCTION_PROPERTY
public static final java.lang.String MARK_BAD_INSTRUCTION_PROPERTY
MARK_BAD_INSTRUCTION_PROPERTY
Program Disassembler property enables marking of instruction disassembly errors. Boolean property is defined within the Disassembler property list, seeProgram.DISASSEMBLER_PROPERTIES
.- See Also:
- Constant Field Values
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MARK_UNIMPL_PCODE_PROPERTY
public static final java.lang.String MARK_UNIMPL_PCODE_PROPERTY
MARK_UNIMPL_PCODE_PROPERTY
Program Disassembler property enables marking of instructions which are missing their pcode implementation. Boolean property is defined within the Disassembler property list, seeProgram.DISASSEMBLER_PROPERTIES
.- See Also:
- Constant Field Values
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RESTRICT_DISASSEMBLY_TO_EXECUTE_MEMORY_PROPERTY
public static final java.lang.String RESTRICT_DISASSEMBLY_TO_EXECUTE_MEMORY_PROPERTY
RESTRICT_DISASSEMBLY_TO_EXECUTE_MEMORY_PROPERTY
Program Disassembler property restricts disassembly to executable memory only. Boolean property is defined within the Disassembler property list, seeProgram.DISASSEMBLER_PROPERTIES
.- See Also:
- Constant Field Values
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ERROR_BOOKMARK_CATEGORY
public static final java.lang.String ERROR_BOOKMARK_CATEGORY
- See Also:
- Constant Field Values
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UNIMPL_BOOKMARK_CATEGORY
public static final java.lang.String UNIMPL_BOOKMARK_CATEGORY
- See Also:
- Constant Field Values
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MAX_REPEAT_PATTERN_LENGTH
public static final int MAX_REPEAT_PATTERN_LENGTH
- See Also:
- Constant Field Values
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language
protected final Language language
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addrFactory
protected final AddressFactory addrFactory
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baseContextRegister
protected final Register baseContextRegister
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parallelHelper
protected final ParallelInstructionLanguageHelper parallelHelper
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disassemblerProgramContext
protected Disassembler.DisassemblerProgramContext disassemblerProgramContext
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disassemblerContext
protected DisassemblerContextImpl disassemblerContext
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bmMgr
protected BookmarkManager bmMgr
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doMarkBadInstructions
protected boolean doMarkBadInstructions
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Constructor Detail
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Disassembler
protected Disassembler(Program program, TaskMonitor monitor, DisassemblerMessageListener listener)
Disassembler constructor. Marking of bad instructions honors "Mark Bad Disassembly" program Disassembler option.- Parameters:
program
- the program to be disassembled.monitor
- progress monitorlistener
- object to notify of disassembly messages.
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Disassembler
protected Disassembler(Language language, AddressFactory addrFactory, TaskMonitor monitor, DisassemblerMessageListener listener)
Disassembler constructor. Intended for block pseudo-disassembly use only.- Parameters:
language
- processor languageaddrFactory
- address factorymonitor
- progress monitorlistener
- object to notify of disassembly messages.
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Disassembler
protected Disassembler(Program program, boolean markBadInstructions, boolean markUnimplementedPcode, boolean restrictToExecuteMemory, TaskMonitor monitor, DisassemblerMessageListener listener)
Disassembler constructor- Parameters:
program
- the program to be disassembled.language
- the language module that "understands" the bytes.markBadInstructions
- if true bad instructions will be markedmarkUnimplementedPcode
- if true instructions with unimplemented pcode will be markedrestrictToExecuteMemory
- if true disassembly will only be permitted with executable memory blocksmonitor
- progress monitorlistener
- object to notify of disassembly messages.
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Method Detail
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getDisassembler
public static Disassembler getDisassembler(Program program, TaskMonitor monitor, DisassemblerMessageListener listener)
Get a suitable disassembler instance. Marking of bad instructions honors "Mark Bad Disassembly" program Disassembler option.- Parameters:
program
- the program to be disassembled.monitor
- progress monitorlistener
- object to notify of disassembly messages.
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getDisassembler
public static Disassembler getDisassembler(Language language, AddressFactory addrFactory, TaskMonitor monitor, DisassemblerMessageListener listener)
Get a suitable disassembler instance. Intended for block pseudo-disassembly use only when the methodpseudoDisassembleBlock(MemBuffer, RegisterValue, int)
is used.- Parameters:
language
- processor languageaddrFactory
- address factorymonitor
- progress monitorlistener
- object to notify of disassembly messages.
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getDisassembler
public static Disassembler getDisassembler(Program program, boolean markBadInstructions, boolean markUnimplementedPcode, boolean restrictToExecuteMemory, TaskMonitor monitor, DisassemblerMessageListener listener)
Get a suitable disassembler instance.- Parameters:
program
- the program to be disassembled.language
- the language module that "understands" the bytes.markBadInstructions
- if true bad instructions will be markedmarkUnimplementedPcode
- if true instructions with unimplemented pcode will be markedrestrictToExecuteMemory
- if true disassembly will only be permitted with executable memory blocksmonitor
- progress monitorlistener
- object to notify of disassembly messages.
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setSeedContext
public void setSeedContext(DisassemblerContextImpl seedContext)
Set seed context which will be used to establish initial context at starting points which are not arrived at via a natural disassembly flow. A null value will disable use of any previously set seed context- Parameters:
seedContext
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setRepeatPatternLimit
public void setRepeatPatternLimit(int maxInstructions)
Set the maximum number of instructions in a single run which contain the same byte values. Disassembly flow will stop and be flagged when this threshold is encountered. This check is set to MAX_REPEAT_PATTERN_LENGTH by default, and can be disabled by setting a value of -1 NOTE: This restriction will only work for those cases where a given repeated byte results in an instruction which has a fall-through.- Parameters:
maxInstructions
- limit on the number of consecutive instructions with the same byte values
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setRepeatPatternLimitIgnored
public void setRepeatPatternLimitIgnored(AddressSetView set)
Set the region over which the repeat pattern limit will be ignored. This allows areas which have been explicitly disassembled to be free of bad bookmarks caused by the repeat pattern limit being exceeded.- Parameters:
set
- region over which the repeat pattern limit will be ignored
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isMarkBadDisassemblyOptionEnabled
public static boolean isMarkBadDisassemblyOptionEnabled(Program program)
- Parameters:
program
-- Returns:
- true if program MARK_BAD_INSTRUCTION_PROPERTY has been enabled
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isMarkUnimplementedPcodeOptionEnabled
public static boolean isMarkUnimplementedPcodeOptionEnabled(Program program)
- Parameters:
program
-- Returns:
- true if program MARK_UNIMPL_PCODE_PROPERTY has been enabled
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isRestrictToExecuteMemory
public static boolean isRestrictToExecuteMemory(Program program)
- Parameters:
program
-- Returns:
- true if program RESTRICT_DISASSEMBLY_TO_EXECUTE_MEMORY_PROPERTY has been enabled
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disassemble
public AddressSet disassemble(AddressSetView startSet, AddressSetView restrictedSet, boolean doFollowFlow)
Attempt disassembly of all undefined code units within the specified set of addresses. NOTE: A single instance of this Disassembler does not support concurrent invocations of the various disassemble methods. Disassembler must be instantiated with a Program object.- Parameters:
startSet
- the minimum set of addresses to disassemblerestrictedSet
- the set of addresses that disassembling is restricted to (may be null)doFollowFlow
- flag to follow references while disassembling.- Returns:
- the set of addresses that were disassembled.
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disassemble
public AddressSet disassemble(AddressSetView startSet, AddressSetView restrictedSet, RegisterValue initialContextValue, boolean doFollowFlow)
Attempt disassembly of all undefined code units within the specified set of addresses. NOTE: A single instance of this Disassembler does not support concurrent invocations of the various disassemble methods. Disassembler must be instantiated with a Program object.- Parameters:
startSet
- the minimum set of addresses to disassemblerestrictedSet
- the set of addresses that disassembling is restricted to (may be null)initialContextValue
- initial context value to be applied at the startAddr. If not null this value will take precedence when combined with any seed value or program context.doFollowFlow
- flag to follow references while disassembling.- Returns:
- the set of addresses that were disassembled.
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disassemble
public AddressSet disassemble(Address startAddr, AddressSetView restrictedSet)
Disassembles code starting at startAddr and restricted to addrSet. NOTE: A single instance of this Disassembler does not support concurrent invocations of the various disassemble methods. Disassembler must be instantiated with a Program object.- Parameters:
startAddr
- the address to begin disassembling.restrictedSet
- the set of addresses that disassembling is restricted to.- Returns:
- AddressSet the set of addresses that were disassembled.
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disassemble
public AddressSet disassemble(Address startAddr, AddressSetView restrictedSet, boolean doFollowFlow)
Disassembles code starting at startAddr and restricted to addrSet. NOTE: A single instance of this Disassembler does not support concurrent invocations of the various disassemble methods. Disassembler must be instantiated with a Program object.- Parameters:
startAddr
- the address to begin disassembling.restrictedSet
- the set of addresses that disassembling is restricted to.doFollowFlow
- flag to follow references while disassembling.- Returns:
- AddressSet the set of addresses that were disassembled.
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disassemble
public AddressSet disassemble(Address startAddr, AddressSetView restrictedSet, RegisterValue initialContextValue, boolean doFollowFlow)
Disassembles code starting at startAddr and restricted to addrSet. NOTE: A single instance of this Disassembler does not support concurrent invocations of the various disassemble methods. Disassembler must be instantiated with a Program object.- Parameters:
startAddr
- the address to begin disassembling.restrictedSet
- the set of addresses that disassembling is restricted to.initialContextValue
- initial context value to be applied at the startAddr. If not null this value will take precedence when combined with any seed value or program context.doFollowFlow
- flag to follow references while disassembling.- Returns:
- AddressSet the set of addresses that were disassembled.
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resetDisassemblerContext
public void resetDisassemblerContext()
Clear any retained context state which may have been accumulated. Use of this method is only needed when using the pseudoDisassembleBlock method over an extended code range to avoid excessive in-memory state accumulation.
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pseudoDisassembleBlock
public InstructionBlock pseudoDisassembleBlock(Address addr, RegisterValue defaultContextValue, int limit)
Perform a psuedo-disassembly of an single instruction block only following fall-throughs. WARNING! This method should not be used in conjunction with other disassembly methods on the this Disassembler instance. Disassembler must be instantiated with a Program object.- Parameters:
addr
- start of blockdefaultContextValue
- starting context to use if no context has previously been established for the specified startAddrlimit
- maximum number of instructions to disassemble- Returns:
- instruction block of pseudo-instructions
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pseudoDisassembleBlock
public InstructionBlock pseudoDisassembleBlock(MemBuffer blockMemBuffer, RegisterValue defaultContextValue, int limit)
Perform a psuedo-disassembly of an single instruction block only following fall-throughs. WARNING! This method should not be used in conjunction with other disassembly methods on the this Disassembler instance.- Parameters:
blockMemBuffer
- block memory bufferdefaultContextValue
- starting context to use if no context has previously been established for the specified startAddrlimit
- maximum number of instructions to disassemble- Returns:
- instruction block of pseudo-instructions or null if minimum address of blockMemBuffer is not properly aligned for instruction parsing.
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disassembleInstructionBlock
protected void disassembleInstructionBlock(InstructionBlock block, MemBuffer blockMemBuffer, Address flowFrom, int limit, InstructionSet instructionSet, boolean skipIfBlockAlreadyDisassembled)
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adjustPreParseContext
protected void adjustPreParseContext(MemBuffer instrMemBuffer) throws UnknownInstructionException
Adjust disassembler context prior to disassembly of a new instruction.- Parameters:
instrMemBuffer
-- Throws:
UnknownInstructionException
- if instruction is invalid
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getPseudoInstruction
protected PseudoInstruction getPseudoInstruction(Address addr, InstructionPrototype prototype, MemBuffer memBuffer, RegisterValue contextValue, InstructionBlock block) throws AddressOverflowException
- Throws:
AddressOverflowException
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isBlockTerminationOK
protected boolean isBlockTerminationOK(Instruction instr)
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processInstruction
protected Address processInstruction(PseudoInstruction inst, MemBuffer blockMemBuffer, InstructionBlock block, InstructionSet instructionSet) throws InsufficientBytesException, UnknownInstructionException, AddressOverflowException, NestedDelaySlotException
Process a new instruction which has just been parsed. This method is responsible for adding the instruction to the current block as well as any delay-slotted instructions. This method may be overridden and the instruction re-parsed if necessary.- Parameters:
inst
-blockMemBuffer
-block
-instructionSet
-- Returns:
- instruction fallthrough address or null if no fallthrough
- Throws:
InsufficientBytesException
- if a memory error occurs during instruction processingUnknownInstructionException
- if an error occurs during a modified re-parse of the instruction.AddressOverflowException
NestedDelaySlotException
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markInstructionError
public void markInstructionError(InstructionError conflict)
- Specified by:
markInstructionError
in interfaceDisassemblerConflictHandler
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markUnimplementedPcode
public static void markUnimplementedPcode(Program program, AddressSetView addressSet, TaskMonitor monitor) throws CancelledException
Mark all instructions with unimplemented pcode over the specified address set- Parameters:
program
-addressSet
- restricted address set or null for entire programmonitor
-- Throws:
CancelledException
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clearUnimplementedPcodeWarnings
public static void clearUnimplementedPcodeWarnings(Program program, AddressSetView addressSet, TaskMonitor monitor) throws CancelledException
Clear all bookmarks which indicate unimplemented pcode within the specified address set.- Parameters:
program
-addressSet
- restricted address set or null for entire programmonitor
-- Throws:
CancelledException
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