/*
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.opcodes.pm;
import org.jpc.emulator.execution.*;
import org.jpc.emulator.execution.decoder.*;
import org.jpc.emulator.processor.*;
import org.jpc.emulator.processor.fpu64.*;
import static org.jpc.emulator.processor.Processor.*;
public class rcr_Ew_I1 extends Executable
{
final int op1Index;
public rcr_Ew_I1(int blockStart, int eip, int prefices, PeekableInputStream input)
{
super(blockStart, eip);
int modrm = input.readU8();
op1Index = Modrm.Ew(modrm);
}
public Branch execute(Processor cpu)
{
Reg op1 = cpu.regs[op1Index];
int shift = 1 & 0x1f;
shift %= 16+1;
if (shift != 0)
{
long val = 0xFFFF&op1.get16();
val |= cpu.cf() ? 1L << 16 : 0;
val = (val >>> shift) | (val << (16+1-shift));
op1.set16((short)(int)val);
boolean bit30 = (val & (1L << (16-2))) != 0;
boolean bit31 = (val & (1L << (16-1))) != 0;
cpu.cf((val & (1L << 16)) != 0);
if (shift == 1)
cpu.of(bit30 ^ bit31);
}
return Branch.None;
}
public boolean isBranch()
{
return false;
}
public String toString()
{
return this.getClass().getName();
}
}