MemoryImage Class Reference

A kind of MemoryBank which retrieves its data from an underlying LoadImage. More...

#include <memstate.hh>

Inheritance diagram for MemoryImage:

Public Member Functions
	MemoryImage (AddrSpace *spc, int4 ws, int4 ps, LoadImage *ld)
	Constructor for a loadimage memorybank. More...
Public Member Functions inherited from MemoryBank
	MemoryBank (AddrSpace *spc, int4 ws, int4 ps)
	Generic constructor for a memory bank. More...
int4	getWordSize (void) const
	Get the number of bytes in a word for this memory bank. More...
int4	getPageSize (void) const
	Get the number of bytes in a page for this memory bank. More...
AddrSpace *	getSpace (void) const
	Get the address space associated with this memory bank. More...
void	setValue (uintb offset, int4 size, uintb val)
	Set the value of a (small) range of bytes. More...
uintb	getValue (uintb offset, int4 size) const
	Retrieve the value encoded in a (small) range of bytes. More...
void	setChunk (uintb offset, int4 size, const uint1 *val)
	Set values of an arbitrary sequence of bytes. More...
void	getChunk (uintb offset, int4 size, uint1 *res) const
	Retrieve an arbitrary sequence of bytes. More...

Protected Member Functions
virtual void	insert (uintb addr, uintb val)
	Exception is thrown for write attempts.
virtual uintb	find (uintb addr) const
	Overridden find method. More...
virtual void	getPage (uintb addr, uint1 *res, int4 skip, int4 size) const
	Overridded getPage method. More...
Protected Member Functions inherited from MemoryBank
virtual void	setPage (uintb addr, const uint1 *val, int4 skip, int4 size)
	Write data into a memory page. More...

Private Attributes
LoadImage *	loader
	The underlying LoadImage.

Additional Inherited Members
Static Public Member Functions inherited from MemoryBank
static uintb	constructValue (const uint1 *ptr, int4 size, bool bigendian)
	Decode bytes to value. More...
static void	deconstructValue (uint1 *ptr, uintb val, int4 size, bool bigendian)
	Encode value to bytes. More...

Detailed Description

A kind of MemoryBank which retrieves its data from an underlying LoadImage.

Any bytes requested on the bank which lie in the LoadImage are retrieved from the LoadImage. Other addresses in the space are filled in with zero. This bank cannot be written to.

Constructor & Destructor Documentation

MemoryImage::MemoryImage	(	AddrSpace *	spc,
		int4	ws,
		int4	ps,
		LoadImage *	ld
	)

Constructor for a loadimage memorybank.

A MemoryImage needs everything a basic memory bank needs and is needs to know the underlying LoadImage object to forward read reqests to.

Parameters

spc	is the address space associated with the memory bank
ws	is the number of bytes in the preferred wordsize (must be power of 2)
ps	is the number of bytes in a page (must be power of 2)
ld	is the underlying LoadImage

References loader.

Member Function Documentation

uintb MemoryImage::find ( uintb  addr ) const

protectedvirtual

Overridden find method.

Find an aligned word from the bank. First an attempt is made to fetch the data from the LoadImage. If this fails, the value is returned as 0.

Parameters

addr	is the address of the word to fetch

Returns

the fetched value

Implements MemoryBank.

References byte_swap(), MemoryBank::getSpace(), MemoryBank::getWordSize(), and AddrSpace::isBigEndian().

void MemoryImage::getPage ( uintb  addr, uint1 *  res, int4  skip, int4  size  ) const

protectedvirtual

Overridded getPage method.

Retrieve an aligned page from the bank. First an attempt is made to retrieve the page from the LoadImage, which may do its own zero filling. If the attempt fails, the page is entirely filled in with zeros.

Reimplemented from MemoryBank.

References MemoryBank::getSpace().

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

• memstate.hh
• memstate.cc