/*
This file is part of jpcsp.
Jpcsp 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 3 of the License, or
(at your option) any later version.
Jpcsp 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 Jpcsp. If not, see <http://www.gnu.org/licenses/>.
*/
package jpcsp.Allegrex.compiler.nativeCode;
import static jpcsp.Allegrex.Common._ra;
import jpcsp.AllegrexOpcodes;
import jpcsp.Memory;
/**
* @author gid15
*
*/
public class PatchCallingJAL extends AbstractNativeCodeSequence {
/*
* This method is very frequently used by the gpSP homebrew.
* Try to optimize it to avoid too much recompilations.
*/
public static int call(int addressReg) {
Memory mem = getMemory();
int patchAddr = getRegisterValue(_ra) - 8;
int jumpAddr = getRegisterValue(addressReg);
int opcode = (AllegrexOpcodes.JAL << 26) | ((jumpAddr >> 2) & 0x03FFFFFF);
mem.write32(patchAddr, opcode);
int delaySlotOpcode = mem.read32(patchAddr + 4);
interpret(delaySlotOpcode);
if (log.isDebugEnabled()) {
log.debug(String.format("PatchCallingJAL at 0x%08X to 0x%08X", patchAddr, jumpAddr));
}
return jumpAddr;
}
}