/*
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.rm;
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 rcl_Ew_CL_mem extends Executable
{
final Pointer op1;
public rcl_Ew_CL_mem(int blockStart, int eip, int prefices, PeekableInputStream input)
{
super(blockStart, eip);
int modrm = input.readU8();
op1 = Modrm.getPointer(prefices, modrm, input);
}
public Branch execute(Processor cpu)
{
int shift = cpu.r_cl.get8() & 0x1f;
shift %= 16+1;
long val = 0xFFFF&op1.get16(cpu);
val |= cpu.cf() ? 1L << 16 : 0;
val = (val << shift) | (val >>> (16+1-shift));
op1.set16(cpu, (short)(int)val);
boolean bit31 = (val & (1L << (16-1))) != 0;
boolean bit32 = (val & (1L << (16))) != 0;
cpu.cf(bit32);
if (shift == 1)
cpu.of(bit31 ^ bit32);
return Branch.None;
}
public boolean isBranch()
{
return false;
}
public String toString()
{
return this.getClass().getName();
}
}