decompiler  1.0.0
Public Member Functions | Private Attributes | List of all members
ghidra::OverlaySpace Class Reference

An overlay space. More...

#include <space.hh>

Inheritance diagram for ghidra::OverlaySpace:
ghidra::AddrSpace

Public Member Functions

 OverlaySpace (AddrSpaceManager *m, const Translate *t)
 Constructor. More...
 
virtual AddrSpacegetContain (void) const
 Return this space's containing space (if any) More...
 
virtual void saveXml (ostream &s) const
 Write the details of this space as XML. More...
 
virtual void decode (Decoder &decoder)
 Recover the details of this space from XML.
 
- Public Member Functions inherited from ghidra::AddrSpace
 AddrSpace (AddrSpaceManager *m, const Translate *t, spacetype tp, const string &nm, uint4 size, uint4 ws, int4 ind, uint4 fl, int4 dl)
 
 AddrSpace (AddrSpaceManager *m, const Translate *t, spacetype tp)
 For use with decode. More...
 
virtual ~AddrSpace (void)
 The address space destructor.
 
const string & getName (void) const
 Get the name. More...
 
AddrSpaceManagergetManager (void) const
 Get the space manager. More...
 
const TranslategetTrans (void) const
 Get the processor translator. More...
 
spacetype getType (void) const
 Get the type of space. More...
 
int4 getDelay (void) const
 Get number of heritage passes being delayed. More...
 
int4 getDeadcodeDelay (void) const
 Get number of passes before deadcode removal is allowed. More...
 
int4 getIndex (void) const
 Get the integer identifier. More...
 
uint4 getWordSize (void) const
 Get the addressable unit size. More...
 
uint4 getAddrSize (void) const
 Get the size of the space. More...
 
uintb getHighest (void) const
 Get the highest byte-scaled address. More...
 
uintb getPointerLowerBound (void) const
 Get lower bound for assuming an offset is a pointer. More...
 
uintb getPointerUpperBound (void) const
 Get upper bound for assuming an offset is a pointer. More...
 
int4 getMinimumPtrSize (void) const
 Get the minimum pointer size for this space. More...
 
uintb wrapOffset (uintb off) const
 Wrap -off- to the offset that fits into this space. More...
 
char getShortcut (void) const
 Get the shortcut character. More...
 
bool isHeritaged (void) const
 Return true if dataflow has been traced. More...
 
bool doesDeadcode (void) const
 Return true if dead code analysis should be done on this space. More...
 
bool hasPhysical (void) const
 Return true if data is physically stored in this. More...
 
bool isBigEndian (void) const
 Return true if values in this space are big endian. More...
 
bool isReverseJustified (void) const
 Return true if alignment justification does not match endianness. More...
 
bool isFormalStackSpace (void) const
 Return true if this is attached to the formal stack pointer. More...
 
bool isOverlay (void) const
 Return true if this is an overlay space.
 
bool isOverlayBase (void) const
 Return true if other spaces overlay this space.
 
bool isOtherSpace (void) const
 Return true if this is the other address space.
 
bool isTruncated (void) const
 Return true if this space is truncated from its original size. More...
 
bool hasNearPointers (void) const
 Return true if near (truncated) pointers into this space are possible.
 
void printOffset (ostream &s, uintb offset) const
 Write an address offset to a stream. More...
 
virtual int4 numSpacebase (void) const
 Number of base registers associated with this space. More...
 
virtual const VarnodeDatagetSpacebase (int4 i) const
 Get a base register that creates this virtual space. More...
 
virtual const VarnodeDatagetSpacebaseFull (int4 i) const
 Return original spacebase register before truncation. More...
 
virtual bool stackGrowsNegative (void) const
 Return true if a stack in this space grows negative. More...
 
virtual int4 overlapJoin (uintb offset, int4 size, AddrSpace *pointSpace, uintb pointOff, int4 pointSkip) const
 Determine if a given point is contained in an address range in this address space. More...
 
virtual void encodeAttributes (Encoder &encoder, uintb offset) const
 Encode address attributes to a stream. More...
 
virtual void encodeAttributes (Encoder &encoder, uintb offset, int4 size) const
 Encode an address and size attributes to a stream. More...
 
virtual uintb decodeAttributes (Decoder &decoder, uint4 &size) const
 Recover an offset and size. More...
 
virtual void printRaw (ostream &s, uintb offset) const
 Write an address in this space to a stream. More...
 
virtual uintb read (const string &s, int4 &size) const
 Read in an address (and possible size) from a string. More...
 

Private Attributes

AddrSpacebaseSpace
 Space being overlayed.
 

Additional Inherited Members

- Public Types inherited from ghidra::AddrSpace
enum  {
  big_endian = 1, heritaged = 2, does_deadcode = 4, programspecific = 8,
  reverse_justification = 16, formal_stackspace = 0x20, overlay = 0x40, overlaybase = 0x80,
  truncated = 0x100, hasphysical = 0x200, is_otherspace = 0x400, has_nearpointers = 0x800
}
 
- Static Public Member Functions inherited from ghidra::AddrSpace
static uintb addressToByte (uintb val, uint4 ws)
 Scale from addressable units to byte units. More...
 
static uintb byteToAddress (uintb val, uint4 ws)
 Scale from byte units to addressable units. More...
 
static int8 addressToByteInt (int8 val, uint4 ws)
 Scale int4 from addressable units to byte units. More...
 
static int8 byteToAddressInt (int8 val, uint4 ws)
 Scale int4 from byte units to addressable units. More...
 
static bool compareByIndex (const AddrSpace *a, const AddrSpace *b)
 Compare two spaces by their index. More...
 
- Protected Member Functions inherited from ghidra::AddrSpace
void calcScaleMask (void)
 Calculate scale and mask. More...
 
void setFlags (uint4 fl)
 Set a cached attribute. More...
 
void clearFlags (uint4 fl)
 Clear a cached attribute. More...
 
void saveBasicAttributes (ostream &s) const
 Write the XML attributes of this space. More...
 
void decodeBasicAttributes (Decoder &decoder)
 Read attributes for this space from an open XML element. More...
 
void truncateSpace (uint4 newsize)
 
- Protected Attributes inherited from ghidra::AddrSpace
string name
 Name of this space.
 
uint4 addressSize
 Size of an address into this space in bytes.
 
uint4 wordsize
 Size of unit being addressed (1=byte)
 
int4 minimumPointerSize
 Smallest size of a pointer into this space (in bytes)
 
int4 index
 An integer identifier for the space.
 
int4 delay
 Delay in heritaging this space.
 
int4 deadcodedelay
 Delay before deadcode removal is allowed on this space.
 

Detailed Description

An overlay space.

A different code and data layout that occupies the same memory as another address space. Some compilers use this concept to increase the logical size of a program without increasing its physical memory requirements. An overlay space allows the same physical location to contain different code and be labeled with different symbols, depending on context. From the point of view of reverse engineering, the different code and symbols are viewed as a logically distinct space.

Constructor & Destructor Documentation

◆ OverlaySpace()

ghidra::OverlaySpace::OverlaySpace ( AddrSpaceManager m,
const Translate t 
)

Constructor.

Parameters
mis the address space manager
tis the processor translator

References baseSpace, ghidra::IPTR_PROCESSOR, ghidra::AddrSpace::overlay, and ghidra::AddrSpace::setFlags().

Member Function Documentation

◆ getContain()

virtual AddrSpace* ghidra::OverlaySpace::getContain ( void  ) const
inlinevirtual

Return this space's containing space (if any)

If this space is virtual, then this routine returns the containing address space, otherwise it returns NULL.

Returns
a pointer to the containing space or NULL

Reimplemented from ghidra::AddrSpace.

References ghidra::AddrSpace::decode(), and ghidra::AddrSpace::saveXml().

◆ saveXml()

void ghidra::OverlaySpace::saveXml ( ostream &  s) const
virtual

Write the details of this space as XML.

Write a tag fully describing the details of this space suitable for later recovery via decode.

Parameters
sis the stream being written

Reimplemented from ghidra::AddrSpace.

References ghidra::a_v(), ghidra::a_v_i(), baseSpace, ghidra::AddrSpace::getName(), ghidra::AddrSpace::index, and ghidra::AddrSpace::name.


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