/*
JPC: An x86 PC Hardware Emulator for a pure Java Virtual Machine
Copyright (C) 2012-2013 Ian Preston
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as published by
the Free Software Foundation.
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.
Details (including contact information) can be found at:
jpc.sourceforge.net
or the developer website
sourceforge.net/projects/jpc/
End of licence header
*/
package org.jpc.emulator.execution.codeblock;
import org.jpc.emulator.processor.Processor;
import org.jpc.emulator.memory.AddressSpace;
class SpanningProtectedModeCodeBlock extends SpanningCodeBlock implements ProtectedModeCodeBlock
{
private PeekableMemoryStream byteSourceStream = new PeekableMemoryStream();
private CodeBlockFactory[] factories;
private int length;
private int decodes = 0;
public SpanningProtectedModeCodeBlock(CodeBlockFactory[] factories)
{
this.factories = factories;
}
public int getX86Length()
{
return length;
}
public CodeBlock decode(Processor cpu)
{
decodes++;
ProtectedModeCodeBlock block = null;
AddressSpace memory = cpu.linearMemory;
int address = cpu.getInstructionPointer();
boolean opSize = cpu.cs.getDefaultSizeFlag();
for (int i = 0; (i < factories.length) && (block == null); i++) {
try {
byteSourceStream.set(memory, address);
block = factories[i].getProtectedModeCodeBlock(byteSourceStream, opSize);
} catch (IllegalStateException e) {e.printStackTrace();}
}
length = block.getX86Length();
if (decodes % 1000 == 0)
System.out.printf("PM Spanning block at %08x of length %d decoded %d times.\n", cpu.getInstructionPointer(), length, decodes);
byteSourceStream.set(null, 0);
return block;
}
public String toString()
{
return "Spanning Protected Mode CodeBlock";
}
}