avrora.sim.mcu
Class ReprogrammableCodeSegment

java.lang.Object
  avrora.sim.Segment
      avrora.sim.CodeSegment
          avrora.sim.mcu.ReprogrammableCodeSegment

public class ReprogrammableCodeSegment

extends CodeSegment

The ReprogrammableCodeSegment class represents a flash segment that stores code. This segment can be updated during execution. It supports probing instructions in the flash segment and updating them. This implementation uses special instructions that automatically disassemble themselves from the machine code representation when they are accessed, allowing dynamic update and execution of machine code.

Nested Class Summary

class	ReprogrammableCodeSegment.DisassembleInstr The DisasssembleInstr class represents an instruction that is used by the interpreter to support dynamic code update.
static class	ReprogrammableCodeSegment.Factory The ReprogrammableCodeSegment.Factory class represents a class capable of creating a new code segment for a new interpreter.

Nested classes inherited from class avrora.sim.CodeSegment

CodeSegment.CodeSharer, CodeSegment.DefaultFactory, CodeSegment.ProbedInstr

Nested classes inherited from class avrora.sim.Segment

Segment.AddressOutOfBoundsException, Segment.ErrorReporter, Segment.Sharer

Field Summary

Fields inherited from class avrora.sim.CodeSegment

codeSharer, MISALIGNED_INSTR, NO_INSTR, segment_instr

Fields inherited from class avrora.sim.Segment

errorReporter, interpreter, name, segment_data, segment_watches, sharer, size, value

Constructor Summary

ReprogrammableCodeSegment(java.lang.String name, int size, BaseInterpreter bi, Segment.ErrorReporter er, int pagesize)
The constructor for the ReprogrammableCodeSegment creates a new instance with the specified name, with the specified size, connected to the specified microcontroller, with the given page size.

Method Summary

protected void	resetBuffer() The resetBuffer() method resets the temporary buffer used for the SPM instruction to its default value.
void	update() The update() method is called by the interpreter when the program executes an instruction that updates the program memory.

Methods inherited from class avrora.sim.CodeSegment

getInstr, insertProbe, load, readInstr, removeProbe, replaceInstr, shareCode, writeInstr

Methods inherited from class avrora.sim.Segment

get, insertWatch, read, removeWatch, set, share, write

Methods inherited from class java.lang.Object

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

Constructor Detail

ReprogrammableCodeSegment

public ReprogrammableCodeSegment(java.lang.String name,
                                 int size,
                                 BaseInterpreter bi,
                                 Segment.ErrorReporter er,
                                 int pagesize)

The constructor for the ReprogrammableCodeSegment creates a new instance with the specified name, with the specified size, connected to the specified microcontroller, with the given page size.

Parameters:

name - the name of the segment as a string

size - the size of the segment in bytes

bi - the the interpreter the code segment is attached to

er - the error reporter consulted for out of bounds accesses

pagesize - the size of the page offset field of an address into the flash

Method Detail

update

public void update()

The update() method is called by the interpreter when the program executes an instruction that updates the program memory. For example, the SPM instruction.

Overrides:

update in class CodeSegment

resetBuffer

protected void resetBuffer()

The resetBuffer() method resets the temporary buffer used for the SPM instruction to its default value.