pcsxr-1.9.92

1 files changed, 804 insertions, 0 deletions

diff --git a/libpcsxcore/psxinterpreter.c b/libpcsxcore/psxinterpreter.c
new file mode 100644
index 0000000..1f4b46c
--- /dev/null
+++ b/libpcsxcore/psxinterpreter.c
@@ -0,0 +1,804 @@
+/***************************************************************************
+ *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team              *
+ *                                                                         *
+ *   This program 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 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   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 02111-1307 USA.           *
+ ***************************************************************************/
+
+/*
+ * PSX assembly interpreter.
+ */
+
+#include "psxcommon.h"
+#include "r3000a.h"
+#include "gte.h"
+#include "psxhle.h"
+
+static int branch = 0;
+static int branch2 = 0;
+static u32 branchPC;
+
+// These macros are used to assemble the repassembler functions
+
+#ifdef PSXCPU_LOG
+#define debugI() PSXCPU_LOG("%s\n", disR3000AF(psxRegs.code, psxRegs.pc)); 
+#else
+#define debugI()
+#endif
+
+inline void execI();
+
+// Subsets
+void (*psxBSC[64])();
+void (*psxSPC[64])();
+void (*psxREG[32])();
+void (*psxCP0[32])();
+void (*psxCP2[64])();
+void (*psxCP2BSC[32])();
+
+static void delayRead(int reg, u32 bpc) {
+	u32 rold, rnew;
+
+//	SysPrintf("delayRead at %x!\n", psxRegs.pc);
+
+	rold = psxRegs.GPR.r[reg];
+	psxBSC[psxRegs.code >> 26](); // branch delay load
+	rnew = psxRegs.GPR.r[reg];
+
+	psxRegs.pc = bpc;
+
+	psxBranchTest();
+
+	psxRegs.GPR.r[reg] = rold;
+	execI(); // first branch opcode
+	psxRegs.GPR.r[reg] = rnew;
+
+	branch = 0;
+}
+
+static void delayWrite(int reg, u32 bpc) {
+
+/*	SysPrintf("delayWrite at %x!\n", psxRegs.pc);
+
+	SysPrintf("%s\n", disR3000AF(psxRegs.code, psxRegs.pc-4));
+	SysPrintf("%s\n", disR3000AF(PSXMu32(bpc), bpc));*/
+
+	// no changes from normal behavior
+
+	psxBSC[psxRegs.code >> 26]();
+
+	branch = 0;
+	psxRegs.pc = bpc;
+
+	psxBranchTest();
+}
+
+static void delayReadWrite(int reg, u32 bpc) {
+
+//	SysPrintf("delayReadWrite at %x!\n", psxRegs.pc);
+
+	// the branch delay load is skipped
+
+	branch = 0;
+	psxRegs.pc = bpc;
+
+	psxBranchTest();
+}
+
+// this defines shall be used with the tmp 
+// of the next func (instead of _Funct_...)
+#define _tFunct_  ((tmp      ) & 0x3F)  // The funct part of the instruction register 
+#define _tRd_     ((tmp >> 11) & 0x1F)  // The rd part of the instruction register 
+#define _tRt_     ((tmp >> 16) & 0x1F)  // The rt part of the instruction register 
+#define _tRs_     ((tmp >> 21) & 0x1F)  // The rs part of the instruction register 
+#define _tSa_     ((tmp >>  6) & 0x1F)  // The sa part of the instruction register
+
+int psxTestLoadDelay(int reg, u32 tmp) {
+	if (tmp == 0) return 0; // NOP
+	switch (tmp >> 26) {
+		case 0x00: // SPECIAL
+			switch (_tFunct_) {
+				case 0x00: // SLL
+				case 0x02: case 0x03: // SRL/SRA
+					if (_tRd_ == reg && _tRt_ == reg) return 1; else
+					if (_tRt_ == reg) return 2; else
+					if (_tRd_ == reg) return 3;
+					break;
+
+				case 0x08: // JR
+					if (_tRs_ == reg) return 2;
+					break;
+				case 0x09: // JALR
+					if (_tRd_ == reg && _tRs_ == reg) return 1; else
+					if (_tRs_ == reg) return 2; else
+					if (_tRd_ == reg) return 3;
+					break;
+
+				// SYSCALL/BREAK just a break;
+
+				case 0x20: case 0x21: case 0x22: case 0x23:
+				case 0x24: case 0x25: case 0x26: case 0x27: 
+				case 0x2a: case 0x2b: // ADD/ADDU...
+				case 0x04: case 0x06: case 0x07: // SLLV...
+					if (_tRd_ == reg && (_tRt_ == reg || _tRs_ == reg)) return 1; else
+					if (_tRt_ == reg || _tRs_ == reg) return 2; else
+					if (_tRd_ == reg) return 3;
+					break;
+
+				case 0x10: case 0x12: // MFHI/MFLO
+					if (_tRd_ == reg) return 3;
+					break;
+				case 0x11: case 0x13: // MTHI/MTLO
+					if (_tRs_ == reg) return 2;
+					break;
+
+				case 0x18: case 0x19:
+				case 0x1a: case 0x1b: // MULT/DIV...
+					if (_tRt_ == reg || _tRs_ == reg) return 2;
+					break;
+			}
+			break;
+
+		case 0x01: // REGIMM
+			switch (_tRt_) {
+				case 0x00: case 0x02:
+				case 0x10: case 0x12: // BLTZ/BGEZ...
+					if (_tRs_ == reg) return 2;
+					break;
+			}
+			break;
+
+		// J would be just a break;
+		case 0x03: // JAL
+			if (31 == reg) return 3;
+			break;
+
+		case 0x04: case 0x05: // BEQ/BNE
+			if (_tRs_ == reg || _tRt_ == reg) return 2;
+			break;
+
+		case 0x06: case 0x07: // BLEZ/BGTZ
+			if (_tRs_ == reg) return 2;
+			break;
+
+		case 0x08: case 0x09: case 0x0a: case 0x0b:
+		case 0x0c: case 0x0d: case 0x0e: // ADDI/ADDIU...
+			if (_tRt_ == reg && _tRs_ == reg) return 1; else
+			if (_tRs_ == reg) return 2; else
+			if (_tRt_ == reg) return 3;
+			break;
+
+		case 0x0f: // LUI
+			if (_tRt_ == reg) return 3;
+			break;
+
+		case 0x10: // COP0
+			switch (_tFunct_) {
+				case 0x00: // MFC0
+					if (_tRt_ == reg) return 3;
+					break;
+				case 0x02: // CFC0
+					if (_tRt_ == reg) return 3;
+					break;
+				case 0x04: // MTC0
+					if (_tRt_ == reg) return 2;
+					break;
+				case 0x06: // CTC0
+					if (_tRt_ == reg) return 2;
+					break;
+				// RFE just a break;
+			}
+			break;
+
+		case 0x12: // COP2
+			switch (_tFunct_) {
+				case 0x00: 
+					switch (_tRs_) {
+						case 0x00: // MFC2
+							if (_tRt_ == reg) return 3;
+							break;
+						case 0x02: // CFC2
+							if (_tRt_ == reg) return 3;
+							break;
+						case 0x04: // MTC2
+							if (_tRt_ == reg) return 2;
+							break;
+						case 0x06: // CTC2
+							if (_tRt_ == reg) return 2;
+							break;
+					}
+					break;
+				// RTPS... break;
+			}
+			break;
+
+		case 0x22: case 0x26: // LWL/LWR
+			if (_tRt_ == reg) return 3; else
+			if (_tRs_ == reg) return 2;
+			break;
+
+		case 0x20: case 0x21: case 0x23:
+		case 0x24: case 0x25: // LB/LH/LW/LBU/LHU
+			if (_tRt_ == reg && _tRs_ == reg) return 1; else
+			if (_tRs_ == reg) return 2; else
+			if (_tRt_ == reg) return 3;
+			break;
+
+		case 0x28: case 0x29: case 0x2a:
+		case 0x2b: case 0x2e: // SB/SH/SWL/SW/SWR
+			if (_tRt_ == reg || _tRs_ == reg) return 2;
+			break;
+
+		case 0x32: case 0x3a: // LWC2/SWC2
+			if (_tRs_ == reg) return 2;
+			break;
+	}
+
+	return 0;
+}
+
+void psxDelayTest(int reg, u32 bpc) {
+	u32 *code;
+	u32 tmp;
+
+	code = (u32 *)PSXM(bpc);
+	tmp = ((code == NULL) ? 0 : SWAP32(*code));
+	branch = 1;
+
+	switch (psxTestLoadDelay(reg, tmp)) {
+		case 1:
+			delayReadWrite(reg, bpc); return;
+		case 2:
+			delayRead(reg, bpc); return;
+		case 3:
+			delayWrite(reg, bpc); return;
+	}
+	psxBSC[psxRegs.code >> 26]();
+
+	branch = 0;
+	psxRegs.pc = bpc;
+
+	psxBranchTest();
+}
+
+__inline void doBranch(u32 tar) {
+	u32 *code;
+	u32 tmp;
+
+	branch2 = branch = 1;
+	branchPC = tar;
+
+	code = (u32 *)PSXM(psxRegs.pc);
+	psxRegs.code = ((code == NULL) ? 0 : SWAP32(*code));
+
+	debugI();
+
+	psxRegs.pc += 4;
+	psxRegs.cycle += BIAS;
+
+	// check for load delay
+	tmp = psxRegs.code >> 26;
+	switch (tmp) {
+		case 0x10: // COP0
+			switch (_Rs_) {
+				case 0x00: // MFC0
+				case 0x02: // CFC0
+					psxDelayTest(_Rt_, branchPC);
+					return;
+			}
+			break;
+		case 0x12: // COP2
+			switch (_Funct_) {
+				case 0x00:
+					switch (_Rs_) {
+						case 0x00: // MFC2
+						case 0x02: // CFC2
+							psxDelayTest(_Rt_, branchPC);
+							return;
+					}
+					break;
+			}
+			break;
+		case 0x32: // LWC2
+			psxDelayTest(_Rt_, branchPC);
+			return;
+		default:
+			if (tmp >= 0x20 && tmp <= 0x26) { // LB/LH/LWL/LW/LBU/LHU/LWR
+				psxDelayTest(_Rt_, branchPC);
+				return;
+			}
+			break;
+	}
+
+	psxBSC[psxRegs.code >> 26]();
+
+	branch = 0;
+	psxRegs.pc = branchPC;
+
+	psxBranchTest();
+}
+
+/*********************************************************
+* Arithmetic with immediate operand                      *
+* Format:  OP rt, rs, immediate                          *
+*********************************************************/
+void psxADDI() 	{ if (!_Rt_) return; _rRt_ = _u32(_rRs_) + _Imm_ ; }		// Rt = Rs + Im 	(Exception on Integer Overflow)
+void psxADDIU() { if (!_Rt_) return; _rRt_ = _u32(_rRs_) + _Imm_ ; }		// Rt = Rs + Im
+void psxANDI() 	{ if (!_Rt_) return; _rRt_ = _u32(_rRs_) & _ImmU_; }		// Rt = Rs And Im
+void psxORI() 	{ if (!_Rt_) return; _rRt_ = _u32(_rRs_) | _ImmU_; }		// Rt = Rs Or  Im
+void psxXORI() 	{ if (!_Rt_) return; _rRt_ = _u32(_rRs_) ^ _ImmU_; }		// Rt = Rs Xor Im
+void psxSLTI() 	{ if (!_Rt_) return; _rRt_ = _i32(_rRs_) < _Imm_ ; }		// Rt = Rs < Im		(Signed)
+void psxSLTIU() { if (!_Rt_) return; _rRt_ = _u32(_rRs_) < ((u32)_Imm_); }		// Rt = Rs < Im		(Unsigned)
+
+/*********************************************************
+* Register arithmetic                                    *
+* Format:  OP rd, rs, rt                                 *
+*********************************************************/
+void psxADD()	{ if (!_Rd_) return; _rRd_ = _u32(_rRs_) + _u32(_rRt_); }	// Rd = Rs + Rt		(Exception on Integer Overflow)
+void psxADDU() 	{ if (!_Rd_) return; _rRd_ = _u32(_rRs_) + _u32(_rRt_); }	// Rd = Rs + Rt
+void psxSUB() 	{ if (!_Rd_) return; _rRd_ = _u32(_rRs_) - _u32(_rRt_); }	// Rd = Rs - Rt		(Exception on Integer Overflow)
+void psxSUBU() 	{ if (!_Rd_) return; _rRd_ = _u32(_rRs_) - _u32(_rRt_); }	// Rd = Rs - Rt
+void psxAND() 	{ if (!_Rd_) return; _rRd_ = _u32(_rRs_) & _u32(_rRt_); }	// Rd = Rs And Rt
+void psxOR() 	{ if (!_Rd_) return; _rRd_ = _u32(_rRs_) | _u32(_rRt_); }	// Rd = Rs Or  Rt
+void psxXOR() 	{ if (!_Rd_) return; _rRd_ = _u32(_rRs_) ^ _u32(_rRt_); }	// Rd = Rs Xor Rt
+void psxNOR() 	{ if (!_Rd_) return; _rRd_ =~(_u32(_rRs_) | _u32(_rRt_)); }// Rd = Rs Nor Rt
+void psxSLT() 	{ if (!_Rd_) return; _rRd_ = _i32(_rRs_) < _i32(_rRt_); }	// Rd = Rs < Rt		(Signed)
+void psxSLTU() 	{ if (!_Rd_) return; _rRd_ = _u32(_rRs_) < _u32(_rRt_); }	// Rd = Rs < Rt		(Unsigned)
+
+/*********************************************************
+* Register mult/div & Register trap logic                *
+* Format:  OP rs, rt                                     *
+*********************************************************/
+void psxDIV() {
+	if (_i32(_rRt_) != 0) {
+		_i32(_rLo_) = _i32(_rRs_) / _i32(_rRt_);
+		_i32(_rHi_) = _i32(_rRs_) % _i32(_rRt_);
+	}
+}
+
+void psxDIVU() {
+	if (_rRt_ != 0) {
+		_rLo_ = _rRs_ / _rRt_;
+		_rHi_ = _rRs_ % _rRt_;
+	}
+}
+
+void psxMULT() {
+	u64 res = (s64)((s64)_i32(_rRs_) * (s64)_i32(_rRt_));
+
+	psxRegs.GPR.n.lo = (u32)(res & 0xffffffff);
+	psxRegs.GPR.n.hi = (u32)((res >> 32) & 0xffffffff);
+}
+
+void psxMULTU() {
+	u64 res = (u64)((u64)_u32(_rRs_) * (u64)_u32(_rRt_));
+
+	psxRegs.GPR.n.lo = (u32)(res & 0xffffffff);
+	psxRegs.GPR.n.hi = (u32)((res >> 32) & 0xffffffff);
+}
+
+/*********************************************************
+* Register branch logic                                  *
+* Format:  OP rs, offset                                 *
+*********************************************************/
+#define RepZBranchi32(op)      if(_i32(_rRs_) op 0) doBranch(_BranchTarget_);
+#define RepZBranchLinki32(op)  if(_i32(_rRs_) op 0) { _SetLink(31); doBranch(_BranchTarget_); }
+
+void psxBGEZ()   { RepZBranchi32(>=) }      // Branch if Rs >= 0
+void psxBGEZAL() { RepZBranchLinki32(>=) }  // Branch if Rs >= 0 and link
+void psxBGTZ()   { RepZBranchi32(>) }       // Branch if Rs >  0
+void psxBLEZ()   { RepZBranchi32(<=) }      // Branch if Rs <= 0
+void psxBLTZ()   { RepZBranchi32(<) }       // Branch if Rs <  0
+void psxBLTZAL() { RepZBranchLinki32(<) }   // Branch if Rs <  0 and link
+
+/*********************************************************
+* Shift arithmetic with constant shift                   *
+* Format:  OP rd, rt, sa                                 *
+*********************************************************/
+void psxSLL() { if (!_Rd_) return; _u32(_rRd_) = _u32(_rRt_) << _Sa_; } // Rd = Rt << sa
+void psxSRA() { if (!_Rd_) return; _i32(_rRd_) = _i32(_rRt_) >> _Sa_; } // Rd = Rt >> sa (arithmetic)
+void psxSRL() { if (!_Rd_) return; _u32(_rRd_) = _u32(_rRt_) >> _Sa_; } // Rd = Rt >> sa (logical)
+
+/*********************************************************
+* Shift arithmetic with variant register shift           *
+* Format:  OP rd, rt, rs                                 *
+*********************************************************/
+void psxSLLV() { if (!_Rd_) return; _u32(_rRd_) = _u32(_rRt_) << _u32(_rRs_); } // Rd = Rt << rs
+void psxSRAV() { if (!_Rd_) return; _i32(_rRd_) = _i32(_rRt_) >> _u32(_rRs_); } // Rd = Rt >> rs (arithmetic)
+void psxSRLV() { if (!_Rd_) return; _u32(_rRd_) = _u32(_rRt_) >> _u32(_rRs_); } // Rd = Rt >> rs (logical)
+
+/*********************************************************
+* Load higher 16 bits of the first word in GPR with imm  *
+* Format:  OP rt, immediate                              *
+*********************************************************/
+void psxLUI() { if (!_Rt_) return; _u32(_rRt_) = psxRegs.code << 16; } // Upper halfword of Rt = Im
+
+/*********************************************************
+* Move from HI/LO to GPR                                 *
+* Format:  OP rd                                         *
+*********************************************************/
+void psxMFHI() { if (!_Rd_) return; _rRd_ = _rHi_; } // Rd = Hi
+void psxMFLO() { if (!_Rd_) return; _rRd_ = _rLo_; } // Rd = Lo
+
+/*********************************************************
+* Move to GPR to HI/LO & Register jump                   *
+* Format:  OP rs                                         *
+*********************************************************/
+void psxMTHI() { _rHi_ = _rRs_; } // Hi = Rs
+void psxMTLO() { _rLo_ = _rRs_; } // Lo = Rs
+
+/*********************************************************
+* Special purpose instructions                           *
+* Format:  OP                                            *
+*********************************************************/
+void psxBREAK() {
+	// Break exception - psx rom doens't handles this
+}
+
+void psxSYSCALL() {
+	psxRegs.pc -= 4;
+	psxException(0x20, branch);
+}
+
+void psxRFE() {
+//	SysPrintf("psxRFE\n");
+	psxRegs.CP0.n.Status = (psxRegs.CP0.n.Status & 0xfffffff0) |
+						  ((psxRegs.CP0.n.Status & 0x3c) >> 2);
+}
+
+/*********************************************************
+* Register branch logic                                  *
+* Format:  OP rs, rt, offset                             *
+*********************************************************/
+#define RepBranchi32(op)      if(_i32(_rRs_) op _i32(_rRt_)) doBranch(_BranchTarget_);
+
+void psxBEQ() {	RepBranchi32(==) }  // Branch if Rs == Rt
+void psxBNE() {	RepBranchi32(!=) }  // Branch if Rs != Rt
+
+/*********************************************************
+* Jump to target                                         *
+* Format:  OP target                                     *
+*********************************************************/
+void psxJ()   {               doBranch(_JumpTarget_); }
+void psxJAL() {	_SetLink(31); doBranch(_JumpTarget_); }
+
+/*********************************************************
+* Register jump                                          *
+* Format:  OP rs, rd                                     *
+*********************************************************/
+void psxJR()   {
+	doBranch(_u32(_rRs_));
+	psxJumpTest();
+}
+
+void psxJALR() {
+	u32 temp = _u32(_rRs_);
+	if (_Rd_) { _SetLink(_Rd_); }
+	doBranch(temp);
+}
+
+/*********************************************************
+* Load and store for GPR                                 *
+* Format:  OP rt, offset(base)                           *
+*********************************************************/
+
+#define _oB_ (_u32(_rRs_) + _Imm_)
+
+void psxLB() {
+	if (_Rt_) {
+		_i32(_rRt_) = (signed char)psxMemRead8(_oB_); 
+	} else {
+		psxMemRead8(_oB_); 
+	}
+}
+
+void psxLBU() {
+	if (_Rt_) {
+		_u32(_rRt_) = psxMemRead8(_oB_);
+	} else {
+		psxMemRead8(_oB_); 
+	}
+}
+
+void psxLH() {
+	if (_Rt_) {
+		_i32(_rRt_) = (short)psxMemRead16(_oB_);
+	} else {
+		psxMemRead16(_oB_);
+	}
+}
+
+void psxLHU() {
+	if (_Rt_) {
+		_u32(_rRt_) = psxMemRead16(_oB_);
+	} else {
+		psxMemRead16(_oB_);
+	}
+}
+
+void psxLW() {
+	if (_Rt_) {
+		_u32(_rRt_) = psxMemRead32(_oB_);
+	} else {
+		psxMemRead32(_oB_);
+	}
+}
+
+u32 LWL_MASK[4] = { 0xffffff, 0xffff, 0xff, 0 };
+u32 LWL_SHIFT[4] = { 24, 16, 8, 0 };
+
+void psxLWL() {
+	u32 addr = _oB_;
+	u32 shift = addr & 3;
+	u32 mem = psxMemRead32(addr & ~3);
+
+	if (!_Rt_) return;
+	_u32(_rRt_) =	( _u32(_rRt_) & LWL_MASK[shift]) | 
+					( mem << LWL_SHIFT[shift]);
+
+	/*
+	Mem = 1234.  Reg = abcd
+
+	0   4bcd   (mem << 24) | (reg & 0x00ffffff)
+	1   34cd   (mem << 16) | (reg & 0x0000ffff)
+	2   234d   (mem <<  8) | (reg & 0x000000ff)
+	3   1234   (mem      ) | (reg & 0x00000000)
+	*/
+}
+
+u32 LWR_MASK[4] = { 0, 0xff000000, 0xffff0000, 0xffffff00 };
+u32 LWR_SHIFT[4] = { 0, 8, 16, 24 };
+
+void psxLWR() {
+	u32 addr = _oB_;
+	u32 shift = addr & 3;
+	u32 mem = psxMemRead32(addr & ~3);
+
+	if (!_Rt_) return;
+	_u32(_rRt_) =	( _u32(_rRt_) & LWR_MASK[shift]) | 
+					( mem >> LWR_SHIFT[shift]);
+
+	/*
+	Mem = 1234.  Reg = abcd
+
+	0   1234   (mem      ) | (reg & 0x00000000)
+	1   a123   (mem >>  8) | (reg & 0xff000000)
+	2   ab12   (mem >> 16) | (reg & 0xffff0000)
+	3   abc1   (mem >> 24) | (reg & 0xffffff00)
+	*/
+}
+
+void psxSB() { psxMemWrite8 (_oB_, _u8 (_rRt_)); }
+void psxSH() { psxMemWrite16(_oB_, _u16(_rRt_)); }
+void psxSW() { psxMemWrite32(_oB_, _u32(_rRt_)); }
+
+u32 SWL_MASK[4] = { 0xffffff00, 0xffff0000, 0xff000000, 0 };
+u32 SWL_SHIFT[4] = { 24, 16, 8, 0 };
+
+void psxSWL() {
+	u32 addr = _oB_;
+	u32 shift = addr & 3;
+	u32 mem = psxMemRead32(addr & ~3);
+
+	psxMemWrite32(addr & ~3,  (_u32(_rRt_) >> SWL_SHIFT[shift]) |
+			     (  mem & SWL_MASK[shift]) );
+	/*
+	Mem = 1234.  Reg = abcd
+
+	0   123a   (reg >> 24) | (mem & 0xffffff00)
+	1   12ab   (reg >> 16) | (mem & 0xffff0000)
+	2   1abc   (reg >>  8) | (mem & 0xff000000)
+	3   abcd   (reg      ) | (mem & 0x00000000)
+	*/
+}
+
+u32 SWR_MASK[4] = { 0, 0xff, 0xffff, 0xffffff };
+u32 SWR_SHIFT[4] = { 0, 8, 16, 24 };
+
+void psxSWR() {
+	u32 addr = _oB_;
+	u32 shift = addr & 3;
+	u32 mem = psxMemRead32(addr & ~3);
+
+	psxMemWrite32(addr & ~3,  (_u32(_rRt_) << SWR_SHIFT[shift]) |
+			     (  mem & SWR_MASK[shift]) );
+
+	/*
+	Mem = 1234.  Reg = abcd
+
+	0   abcd   (reg      ) | (mem & 0x00000000)
+	1   bcd4   (reg <<  8) | (mem & 0x000000ff)
+	2   cd34   (reg << 16) | (mem & 0x0000ffff)
+	3   d234   (reg << 24) | (mem & 0x00ffffff)
+	*/
+}
+
+/*********************************************************
+* Moves between GPR and COPx                             *
+* Format:  OP rt, fs                                     *
+*********************************************************/
+void psxMFC0() { if (!_Rt_) return; _i32(_rRt_) = (int)_rFs_; }
+void psxCFC0() { if (!_Rt_) return; _i32(_rRt_) = (int)_rFs_; }
+
+void psxTestSWInts() {
+	// the next code is untested, if u know please
+	// tell me if it works ok or not (linuzappz)
+	if (psxRegs.CP0.n.Cause & psxRegs.CP0.n.Status & 0x0300 &&
+		psxRegs.CP0.n.Status & 0x1) {
+		psxException(psxRegs.CP0.n.Cause, branch);
+	}
+}
+
+__inline void MTC0(int reg, u32 val) {
+//	SysPrintf("MTC0 %d: %x\n", reg, val);
+	switch (reg) {
+		case 12: // Status
+			psxRegs.CP0.r[12] = val;
+			psxTestSWInts();
+			break;
+
+		case 13: // Cause
+			psxRegs.CP0.n.Cause = val & ~(0xfc00);
+			psxTestSWInts();
+			break;
+
+		default:
+			psxRegs.CP0.r[reg] = val;
+			break;
+	}
+}
+
+void psxMTC0() { MTC0(_Rd_, _u32(_rRt_)); }
+void psxCTC0() { MTC0(_Rd_, _u32(_rRt_)); }
+
+/*********************************************************
+* Unknow instruction (would generate an exception)       *
+* Format:  ?                                             *
+*********************************************************/
+void psxNULL() { 
+#ifdef PSXCPU_LOG
+	PSXCPU_LOG("psx: Unimplemented op %x\n", psxRegs.code);
+#endif
+}
+
+void psxSPECIAL() {
+	psxSPC[_Funct_]();
+}
+
+void psxREGIMM() {
+	psxREG[_Rt_]();
+}
+
+void psxCOP0() {
+	psxCP0[_Rs_]();
+}
+
+void psxCOP2() {
+	psxCP2[_Funct_]();
+}
+
+void psxBASIC() {
+	psxCP2BSC[_Rs_]();
+}
+
+void psxHLE() {
+//	psxHLEt[psxRegs.code & 0xffff]();
+	psxHLEt[psxRegs.code & 0x07]();		// HDHOSHY experimental patch
+}
+
+void (*psxBSC[64])() = {
+	psxSPECIAL, psxREGIMM, psxJ   , psxJAL  , psxBEQ , psxBNE , psxBLEZ, psxBGTZ,
+	psxADDI   , psxADDIU , psxSLTI, psxSLTIU, psxANDI, psxORI , psxXORI, psxLUI ,
+	psxCOP0   , psxNULL  , psxCOP2, psxNULL , psxNULL, psxNULL, psxNULL, psxNULL,
+	psxNULL   , psxNULL  , psxNULL, psxNULL , psxNULL, psxNULL, psxNULL, psxNULL,
+	psxLB     , psxLH    , psxLWL , psxLW   , psxLBU , psxLHU , psxLWR , psxNULL,
+	psxSB     , psxSH    , psxSWL , psxSW   , psxNULL, psxNULL, psxSWR , psxNULL, 
+	psxNULL   , psxNULL  , gteLWC2, psxNULL , psxNULL, psxNULL, psxNULL, psxNULL,
+	psxNULL   , psxNULL  , gteSWC2, psxHLE  , psxNULL, psxNULL, psxNULL, psxNULL 
+};
+
+
+void (*psxSPC[64])() = {
+	psxSLL , psxNULL , psxSRL , psxSRA , psxSLLV   , psxNULL , psxSRLV, psxSRAV,
+	psxJR  , psxJALR , psxNULL, psxNULL, psxSYSCALL, psxBREAK, psxNULL, psxNULL,
+	psxMFHI, psxMTHI , psxMFLO, psxMTLO, psxNULL   , psxNULL , psxNULL, psxNULL,
+	psxMULT, psxMULTU, psxDIV , psxDIVU, psxNULL   , psxNULL , psxNULL, psxNULL,
+	psxADD , psxADDU , psxSUB , psxSUBU, psxAND    , psxOR   , psxXOR , psxNOR ,
+	psxNULL, psxNULL , psxSLT , psxSLTU, psxNULL   , psxNULL , psxNULL, psxNULL,
+	psxNULL, psxNULL , psxNULL, psxNULL, psxNULL   , psxNULL , psxNULL, psxNULL,
+	psxNULL, psxNULL , psxNULL, psxNULL, psxNULL   , psxNULL , psxNULL, psxNULL
+};
+
+void (*psxREG[32])() = {
+	psxBLTZ  , psxBGEZ  , psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL,
+	psxNULL  , psxNULL  , psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL,
+	psxBLTZAL, psxBGEZAL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL,
+	psxNULL  , psxNULL  , psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL
+};
+
+void (*psxCP0[32])() = {
+	psxMFC0, psxNULL, psxCFC0, psxNULL, psxMTC0, psxNULL, psxCTC0, psxNULL,
+	psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL,
+	psxRFE , psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL,
+	psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL
+};
+
+void (*psxCP2[64])() = {
+	psxBASIC, gteRTPS , psxNULL , psxNULL, psxNULL, psxNULL , gteNCLIP, psxNULL, // 00
+	psxNULL , psxNULL , psxNULL , psxNULL, gteOP  , psxNULL , psxNULL , psxNULL, // 08
+	gteDPCS , gteINTPL, gteMVMVA, gteNCDS, gteCDP , psxNULL , gteNCDT , psxNULL, // 10
+	psxNULL , psxNULL , psxNULL , gteNCCS, gteCC  , psxNULL , gteNCS  , psxNULL, // 18
+	gteNCT  , psxNULL , psxNULL , psxNULL, psxNULL, psxNULL , psxNULL , psxNULL, // 20
+	gteSQR  , gteDCPL , gteDPCT , psxNULL, psxNULL, gteAVSZ3, gteAVSZ4, psxNULL, // 28 
+	gteRTPT , psxNULL , psxNULL , psxNULL, psxNULL, psxNULL , psxNULL , psxNULL, // 30
+	psxNULL , psxNULL , psxNULL , psxNULL, psxNULL, gteGPF  , gteGPL  , gteNCCT  // 38
+};
+
+void (*psxCP2BSC[32])() = {
+	gteMFC2, psxNULL, gteCFC2, psxNULL, gteMTC2, psxNULL, gteCTC2, psxNULL,
+	psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL,
+	psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL,
+	psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL, psxNULL
+};
+
+
+///////////////////////////////////////////
+
+static int intInit() {
+	return 0;
+}
+
+static void intReset() {
+}
+
+static void intExecute() {
+	for (;;) 
+		execI();
+}
+
+static void intExecuteBlock() {
+	branch2 = 0;
+	while (!branch2) execI();
+}
+
+static void intClear(u32 Addr, u32 Size) {
+}
+
+static void intShutdown() {
+}
+
+// interpreter execution
+inline void execI() { 
+	u32 *code = (u32 *)PSXM(psxRegs.pc);
+	psxRegs.code = ((code == NULL) ? 0 : SWAP32(*code));
+
+	debugI();
+
+	if (Config.Debug) ProcessDebug();
+
+	psxRegs.pc += 4;
+	psxRegs.cycle += BIAS;
+
+	psxBSC[psxRegs.code >> 26]();
+}
+
+R3000Acpu psxInt = {
+	intInit,
+	intReset,
+	intExecute,
+	intExecuteBlock,
+	intClear,
+	intShutdown
+};