/*====================================================================

   filename:     opcodes.h
   project:      GameCube DSP Tool (gcdsp)
   created:      2005.03.04
   mail:		  duddie@walla.com

   Copyright (c) 2005 Duddie

   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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

   ====================================================================*/

#include "DSPIntUtil.h"
#include "DSPMemoryMap.h"
#include "DSPIntExtOps.h"

// Extended opcodes do not exist on their own. These opcodes can only be
// attached to opcodes that allow extending (8 lower bits of opcode not used by
// opcode). Extended opcodes do not modify program counter $pc register.

// Most of the suffixes increment or decrement one or more addressing registers
// (the first four, ARx). The increment/decrement is either 1, or the corresponding 
// "index" register (the second four, IXx). The addressing registers will wrap
// in odd ways, dictated by the corresponding wrapping register, WP0-3.

// The following should be applied as a decrement (and is applied by dsp_decrement_addr_reg):
// ar[i] = (ar[i] & wp[i]) == 0 ? ar[i] | wp[i] : ar[i] - 1;
// I have not found the corresponding algorithms for increments yet.
// It's gotta be fairly simple though. See R3123, R3125 in Google Code.
// (May have something to do with (ar[i] ^ wp[i]) == 0)


namespace DSPInterpreter
{

namespace Ext 
{

// DR $arR
// xxxx xxxx 0000 01rr
// Decrement addressing register $arR.
void dr(const UDSPInstruction& opc) {
	dsp_decrement_addr_reg(opc.hex & 0x3);
}

// IR $arR
// xxxx xxxx 0000 10rr
// Increment addressing register $arR.
void ir(const UDSPInstruction& opc) {
	dsp_increment_addr_reg(opc.hex & 0x3);
}

// NR $arR
// xxxx xxxx 0000 11rr
// Add corresponding indexing register $ixR to addressing register $arR.
void nr(const UDSPInstruction& opc) {
	u8 reg = opc.hex & 0x3;	
 
	dsp_increase_addr_reg(reg, (s16)g_dsp.r[DSP_REG_IX0 + reg]);
}

// MV $axD, $acS.l
// xxxx xxxx 0001 ddss
// Move value of $acS.l to the $axD.l.
void mv(const UDSPInstruction& opc)
{
	u8 sreg = opc.hex & 0x3;
	u8 dreg = ((opc.hex >> 2) & 0x3);
	
	g_dsp.r[dreg + DSP_REG_AXL0] = g_dsp.r[sreg + DSP_REG_ACC0];
}

// S @$D, $acD.l
// xxxx xxxx 001s s0dd
// Store value of $(acS.l) in the memory pointed by register $D.
// Post increment register $D.
void s(const UDSPInstruction& opc)
{
	u8 dreg = opc.hex & 0x3;
	u8 sreg = ((opc.hex >> 3) & 0x3) + DSP_REG_ACC0;

	dsp_dmem_write(g_dsp.r[dreg], g_dsp.r[sreg]);

	dsp_increment_addr_reg(dreg);
}

// SN @$D, $acD.l
// xxxx xxxx 001s s1dd
// Store value of register $acS in the memory pointed by register $D.
// Add indexing register $ixD to register $D.
void sn(const UDSPInstruction& opc)
{
	u8 dreg = opc.hex & 0x3;
	u8 sreg = ((opc.hex >> 3) & 0x3) + DSP_REG_ACC0;

	dsp_dmem_write(g_dsp.r[dreg], g_dsp.r[sreg]);

	dsp_increase_addr_reg(dreg, (s16)g_dsp.r[DSP_REG_IX0 + dreg]);
}

// L axD.l, @$S
// xxxx xxxx 01dd d0ss
// Load $axD with value from memory pointed by register $S. 
// Post increment register $S.
void l(const UDSPInstruction& opc)
{
	u8 sreg = opc.hex & 0x3;
	u8 dreg = ((opc.hex >> 3) & 0x7) + DSP_REG_AXL0;

	u16 val = dsp_dmem_read(g_dsp.r[sreg]);
	g_dsp.r[dreg] = val;

	dsp_increment_addr_reg(sreg);
}

// LN axD.l, @$S
// xxxx xxxx 01dd d0ss
// Load $axD with value from memory pointed by register $S. 
// Add indexing register register $ixS to register $S.
void ln(const UDSPInstruction& opc)
{
	u8 sreg = opc.hex & 0x3;
	u8 dreg = ((opc.hex >> 3) & 0x7) + DSP_REG_AXL0;

	u16 val = dsp_dmem_read(g_dsp.r[sreg]);
	g_dsp.r[dreg] = val;

	dsp_increase_addr_reg(sreg, (s16)g_dsp.r[DSP_REG_IX0 + sreg]);
}

// LS $(0x18+D), $acS.m
// xxxx xxxx 10dd 000s
// Load register $(0x18+D) with value from memory pointed by register
// $ar0. Store value from register $acS.m to memory location pointed by
// register $ar3. Increment both $ar0 and $ar3.
void ls(const UDSPInstruction& opc)
{
	u8 areg = (opc.hex & 0x1) + DSP_REG_ACM0;
	u8 sreg = 0x03;
	dsp_dmem_write(g_dsp.r[sreg], g_dsp.r[areg]);

	dsp_increment_addr_reg(sreg);
	currentEpilogeFunc = ls_epi;
}

void ls_epi(const UDSPInstruction& opc)
{
	u8 dreg = ((opc.hex >> 4) & 0x3) + DSP_REG_AXL0;
	u16 val = dsp_dmem_read(g_dsp.r[0x00]);
	dsp_op_write_reg(dreg, val);
	
	dsp_increment_addr_reg(0x00); 
}

// LSN $(0x18+D), $acS.m
// xxxx xxxx 10dd 010s
// Load register $(0x18+D) with value from memory pointed by register
// $ar0. Store value from register $acS.m to memory location pointed by
// register $ar3. Add corresponding indexing register $ix0 to addressing
// register $ar0 and increment $ar3.
void lsn(const UDSPInstruction& opc)
{
	u8 areg = (opc.hex & 0x1) + DSP_REG_ACM0;
	u8 sreg = 0x03;
	
	dsp_dmem_write(g_dsp.r[sreg], g_dsp.r[areg]);
	dsp_increment_addr_reg(sreg);
	currentEpilogeFunc = lsn_epi;
}

void lsn_epi(const UDSPInstruction& opc)
{
	u8 dreg = ((opc.hex >> 4) & 0x3) + DSP_REG_AXL0;
	u16 val = dsp_dmem_read(g_dsp.r[0x00]);
	dsp_op_write_reg(dreg, val);
	
	dsp_increase_addr_reg(0x00, (s16)g_dsp.r[DSP_REG_IX0]);
}

// LSM $(0x18+D), $acS.m
// xxxx xxxx 10dd 100s
// Load register $(0x18+D) with value from memory pointed by register
// $ar0. Store value from register $acS.m to memory location pointed by
// register $ar3. Add corresponding indexing register $ix3 to addressing
// register $ar3 and increment $ar0.
void lsm(const UDSPInstruction& opc)
{
	u8 areg = (opc.hex & 0x1) + DSP_REG_ACM0;
	u8 sreg = 0x03;

	dsp_dmem_write(g_dsp.r[sreg], g_dsp.r[areg]);
	dsp_increase_addr_reg(sreg, (s16)g_dsp.r[DSP_REG_IX0 + sreg]);
	currentEpilogeFunc = lsm_epi;

}

void lsm_epi(const UDSPInstruction& opc)
{
	u8 dreg = ((opc.hex >> 4) & 0x3) + DSP_REG_AXL0;
	u16 val = dsp_dmem_read(g_dsp.r[0x00]);
	dsp_op_write_reg(dreg, val);

	dsp_increment_addr_reg(0x00); 
}

// LSMN $(0x18+D), $acS.m
// xxxx xxxx 10dd 110s
// Load register $(0x18+D) with value from memory pointed by register
// $ar0. Store value from register $acS.m to memory location pointed by
// register $ar3. Add corresponding indexing register $ix0 to addressing
// register $ar0 and add corresponding indexing register $ix3 to addressing
// register $ar3.
void lsnm(const UDSPInstruction& opc)
{
	u8 areg = (opc.hex & 0x1) + DSP_REG_ACM0;
	u8 sreg = 0x03;

	dsp_dmem_write(g_dsp.r[sreg], g_dsp.r[areg]);
	dsp_increase_addr_reg(sreg, (s16)g_dsp.r[DSP_REG_IX0 + sreg]);
	currentEpilogeFunc = lsnm_epi;
	
}

void lsnm_epi(const UDSPInstruction& opc)
{
	u8 dreg = ((opc.hex >> 4) & 0x3) + DSP_REG_AXL0;
	u16 val = dsp_dmem_read(g_dsp.r[0x00]);

	dsp_op_write_reg(dreg, val);	
	dsp_increase_addr_reg(0x00, (s16)g_dsp.r[DSP_REG_IX0]);	
}

// SL $acS.m, $(0x18+D)
// xxxx xxxx 10dd 001s
// Store value from register $acS.m to memory location pointed by register
// $ar0. Load register $(0x18+D) with value from memory pointed by register
// $ar3. Increment both $ar0 and $ar3.
void sl(const UDSPInstruction& opc)
{
	u8 areg = (opc.hex & 0x1) + DSP_REG_ACM0;
	
	dsp_dmem_write(g_dsp.r[0x00], g_dsp.r[areg]);
	dsp_increment_addr_reg(0x00);
	currentEpilogeFunc = sl_epi;
}

void sl_epi(const UDSPInstruction& opc)
{
	u8 dreg = ((opc.hex >> 4) & 0x3) + 0x18;
	const u8 sreg = 0x03;
	u16 val = dsp_dmem_read(g_dsp.r[sreg]);

	dsp_op_write_reg(dreg, val);
	dsp_increment_addr_reg(sreg);
}

// SLN $acS.m, $(0x18+D)
// xxxx xxxx 10dd 011s
// Store value from register $acS.m to memory location pointed by register
// $ar0. Load register $(0x18+D) with value from memory pointed by register
// $ar3. Add corresponding indexing register $ix0 to addressing register $ar0
// and increment $ar3.
void sln(const UDSPInstruction& opc)
{
	u8 areg = (opc.hex & 0x1) + DSP_REG_ACM0;
	
	dsp_dmem_write(g_dsp.r[0x00], g_dsp.r[areg]);
	dsp_increase_addr_reg(0x00, (s16)g_dsp.r[DSP_REG_IX0]);
	currentEpilogeFunc = sln_epi;
}

void sln_epi(const UDSPInstruction& opc)
{
	u8 dreg = ((opc.hex >> 4) & 0x3) + 0x18;
	const u8 sreg = 0x03;
	u16 val = dsp_dmem_read(g_dsp.r[sreg]);

	dsp_op_write_reg(dreg, val);
	dsp_increment_addr_reg(sreg);	
}

// SLM $acS.m, $(0x18+D)
// xxxx xxxx 10dd 101s
// Store value from register $acS.m to memory location pointed by register
// $ar0. Load register $(0x18+D) with value from memory pointed by register
// $ar3. Add corresponding indexing register $ix3 to addressing register $ar3
// and increment $ar0.
void slm(const UDSPInstruction& opc)
{
	u8 areg = (opc.hex & 0x1) + DSP_REG_ACM0;

	dsp_dmem_write(g_dsp.r[0x00], g_dsp.r[areg]);
	dsp_increment_addr_reg(0x00);
	currentEpilogeFunc = slm_epi;
}

void slm_epi(const UDSPInstruction& opc)
{
	u8 dreg = ((opc.hex >> 4) & 0x3) + 0x18;
	const u8 sreg = 0x03;
	u16 val = dsp_dmem_read(g_dsp.r[sreg]);

	dsp_op_write_reg(dreg, val);
	dsp_increase_addr_reg(sreg, (s16)g_dsp.r[DSP_REG_IX0 + sreg]);
}

// SLMN $acS.m, $(0x18+D)
// xxxx xxxx 10dd 111s
// Store value from register $acS.m to memory location pointed by register
// $ar0. Load register $(0x18+D) with value from memory pointed by register
// $ar3. Add corresponding indexing register $ix0 to addressing register $ar0
// and add corresponding indexing register $ix3 to addressing register $ar3.
void slnm(const UDSPInstruction& opc)
{
	u8 areg = (opc.hex & 0x1) + DSP_REG_ACM0;

	dsp_dmem_write(g_dsp.r[0x00], g_dsp.r[areg]);
	dsp_increase_addr_reg(0x00, (s16)g_dsp.r[DSP_REG_IX0]);	
	currentEpilogeFunc = slnm_epi;

}

void slnm_epi(const UDSPInstruction& opc)
{
	u8 dreg = ((opc.hex >> 4) & 0x3) + 0x18;
	const u8 sreg = 0x03;
	u16 val = dsp_dmem_read(g_dsp.r[sreg]);

	dsp_op_write_reg(dreg, val);
	dsp_increase_addr_reg(sreg, (s16)g_dsp.r[DSP_REG_IX0 + sreg]);
}

// Not in duddie's doc
// LD $ax0.d $ax1.r @$arS
// xxxx xxxx 11dr 00ss
void ld(const UDSPInstruction& opc)
{
	u8 dreg = (((opc.hex >> 5) & 0x1) << 1) + DSP_REG_AXL0;
	u8 rreg = (((opc.hex >> 4) & 0x1) << 1) + DSP_REG_AXL1;
	u8 sreg = opc.hex & 0x3;
	g_dsp.r[dreg] = dsp_dmem_read(g_dsp.r[sreg]);
	g_dsp.r[rreg] = dsp_dmem_read(g_dsp.r[DSP_REG_AR3]);

	dsp_increment_addr_reg(sreg);
	dsp_increment_addr_reg(DSP_REG_AR3);
}

// Not in duddie's doc
// LDN $ax0.d $ax1.r @$arS
// xxxx xxxx 11dr 01ss
void ldn(const UDSPInstruction& opc)
{
	u8 dreg = (((opc.hex >> 5) & 0x1) << 1) + DSP_REG_AXL0;
	u8 rreg = (((opc.hex >> 4) & 0x1) << 1) + DSP_REG_AXL1;
	u8 sreg = opc.hex & 0x3;
	g_dsp.r[dreg] = dsp_dmem_read(g_dsp.r[sreg]);
	g_dsp.r[rreg] = dsp_dmem_read(g_dsp.r[DSP_REG_AR3]);

	g_dsp.r[sreg] += g_dsp.r[sreg + DSP_REG_IX0];
	dsp_increment_addr_reg(DSP_REG_AR3);
}

// Not in duddie's doc
// LDM $ax0.d $ax1.r @$arS
// xxxx xxxx 11dr 10ss
void ldm(const UDSPInstruction& opc)
{
	u8 dreg = (((opc.hex >> 5) & 0x1) << 1) + DSP_REG_AXL0;
	u8 rreg = (((opc.hex >> 4) & 0x1) << 1) + DSP_REG_AXL1;
	u8 sreg = opc.hex & 0x3;
	g_dsp.r[dreg] = dsp_dmem_read(g_dsp.r[sreg]);
	g_dsp.r[rreg] = dsp_dmem_read(g_dsp.r[DSP_REG_AR3]);

	dsp_increment_addr_reg(sreg);
	g_dsp.r[DSP_REG_AR3] += g_dsp.r[DSP_REG_IX3];
}

// Not in duddie's doc
// LDNM $ax0.d $ax1.r @$arS
// xxxx xxxx 11dr 11ss
void ldnm(const UDSPInstruction& opc)
{
	u8 dreg = (((opc.hex >> 5) & 0x1) << 1) + DSP_REG_AXL0;
	u8 rreg = (((opc.hex >> 4) & 0x1) << 1) + DSP_REG_AXL1;
	u8 sreg = opc.hex & 0x3;
	g_dsp.r[dreg] = dsp_dmem_read(g_dsp.r[sreg]);
	g_dsp.r[rreg] = dsp_dmem_read(g_dsp.r[DSP_REG_AR3]);

	g_dsp.r[sreg] += g_dsp.r[sreg + DSP_REG_IX0];
	g_dsp.r[DSP_REG_AR3] += g_dsp.r[DSP_REG_IX3];
}

void nop(const UDSPInstruction& opc)
{
}

} // end namespace ext
} // end namespace DSPInterpeter