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/*
****************************************************************************
*
* simulavr - A simulator for the Atmel AVR family of microcontrollers.
* Copyright (C) 2001, 2002, 2003 Klaus Rudolph
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
****************************************************************************
*
* $Id$
*/
#ifndef FLASH_H_INCLUDED
#define FLASH_H_INCLUDED
#include <string>
#include <map>
#include <vector>
#include "decoder.h"
#include "memory.h"
class DecodedInstruction;
//! Holds AVR flash content and symbol informations.
class AvrFlash: public Memory {
protected:
AvrDevice *core;
std::vector <DecodedInstruction*> DecodedMem;
unsigned int rww_lock; //!< When Flash write is in progress then addresses below this are inaccesible, otherwise 0.
bool flashLoaded; //!< Flag, true if there was a write to Flash after constructor call (program load)
friend int avr_op_CPSE::operator()();
friend int avr_op_SBIC::operator()();
friend int avr_op_SBIS::operator()();
friend int avr_op_SBRC::operator()();
friend int avr_op_SBRS::operator()();
public:
AvrFlash(AvrDevice *c, int size);
~AvrFlash();
void Decode(); /*!< Decode/create all instructions */
/*! Decode/create instruction at address 'addr'. */
void Decode(unsigned int addr);
/*! Decode memory block with offset and size
@param offset data offset in memory block, beginning from start of THIS memory block!
@param secSize count of available data (bytes) in src */
void Decode(unsigned int addr, int secSize);
/*! Write `secSize' bytes from `src' data to byte address `addr'.
@param src binary c-string with data to write in
@param secSize count of available data (bytes) in src */
void WriteMem(const unsigned char* src, unsigned int addr, unsigned int secSize);
/*! Write byte `val' at `address' (in bytes). Caller must call Decode() later. */
void WriteMemByte(unsigned char val, unsigned int address);
/*! True if flash was written, i.e. a program was loaded */
bool IsProgramLoaded(void) { return flashLoaded; }
/*! True if simulated Flash write is in progress and the address is in locked area. */
bool IsRWWLock(unsigned int addr) { return (addr < rww_lock);}
/*! Sets/Resets RWW lock address
@param addr address, below flash is locked, 0 to disable lock */
void SetRWWLock(unsigned int addr) { rww_lock = addr;}
/*! Returns instruction at pointer PC. Aborts if Flash write is in progress. */
DecodedInstruction* GetInstruction(unsigned int pc);
/*! Returns byte at flash address. Works even during flash writing. */
unsigned char ReadMemRaw(unsigned int addr) { return myMemory[addr]; }
/*! Returns byte at flash address. Aborts if Flash write is in progress. */
unsigned char ReadMem(unsigned int addr);
/*! Returns 16bits at flash address. Works even during flash writing. */
unsigned int ReadMemRawWord(unsigned int addr) { return (myMemory[addr] << 8) + myMemory[addr + 1]; }
/*! Returns 16bits at flash address. Aborts if Flash write is in progress. */
unsigned int ReadMemWord(unsigned int addr);
bool LooksLikeContextSwitch(unsigned int addr) const;
};
#endif
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