DSPLLE: Split the huge DSPInterpreter.cpp into separate files for the different categories of ops. Minor cleanups.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3134 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/DSPCore/Src/DspIntBranch.cpp

@@ -0,0 +1,250 @@
+// Copyright (C) 2003-2009 Dolphin Project.
+
+// 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, version 2.0.
+
+// 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 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+// Additional copyrights go to Duddie and Tratax (c) 2004
+
+#include "DSPInterpreter.h"
+#include "DSPCore.h"
+
+#include "gdsp_condition_codes.h"
+#include "gdsp_opcodes_helper.h"
+#include "gdsp_memory.h"
+
+
+namespace DSPInterpreter {
+
+// Generic call implementation
+// CALLcc addressA
+// 0000 0010 1011 cccc
+// aaaa aaaa aaaa aaaa
+// Call function if condition cc has been met. Push program counter of
+// instruction following "call" to $st0. Set program counter to address
+// represented by value that follows this "call" instruction.
+void call(const UDSPInstruction& opc)
+{
+	// must be outside the if.
+	u16 dest = dsp_fetch_code();
+	if (CheckCondition(opc.hex & 0xf))
+	{
+		dsp_reg_store_stack(DSP_STACK_C, g_dsp.pc);
+		g_dsp.pc = dest;
+	}
+}
+
+// Generic callr implementation
+// CALLRcc $R
+// 0001 0111 rrr1 cccc
+// Call functionif condition cc has been met.Push program counter of 
+// instruction following "call" tocall stack $st0. Set program counter to 
+// register $R.
+void callr(const UDSPInstruction& opc)
+{
+	if (CheckCondition(opc.hex & 0xf))
+	{
+		u8 reg  = (opc.hex >> 5) & 0x7;
+		u16 addr = dsp_op_read_reg(reg);
+		dsp_reg_store_stack(DSP_STACK_C, g_dsp.pc);
+		g_dsp.pc = addr;
+	}
+}
+
+// Generic if implementation
+// IFcc
+// 0000 0010 0111 cccc
+// Execute following opcode if the condition has been met.
+void ifcc(const UDSPInstruction& opc)
+{
+	if (!CheckCondition(opc.hex & 0xf))
+	{
+		// skip the next opcode - we have to lookup its size.
+		g_dsp.pc += opSize[dsp_peek_code()];
+	}
+}
+
+// Generic jmp implementation
+// Jcc addressA
+// 0000 0010 1001 cccc
+// aaaa aaaa aaaa aaaa
+// Jump to addressA if condition cc has been met. Set program counter to
+// address represented by value that follows this "jmp" instruction.
+void jcc(const UDSPInstruction& opc)
+{
+	u16 dest = dsp_fetch_code();
+	if (CheckCondition(opc.hex & 0xf))
+	{
+		g_dsp.pc = dest;
+	}
+}
+
+// Generic jmpr implementation
+// JMPcc $R
+// 0001 0111 rrr0 cccc
+// Jump to address; set program counter to a value from register $R.
+void jmprcc(const UDSPInstruction& opc)
+{
+	if (CheckCondition(opc.hex & 0xf))
+	{
+		u8 reg  = (opc.hex >> 5) & 0x7;
+		g_dsp.pc = dsp_op_read_reg(reg);
+	} 
+}
+
+// Generic ret implementation
+// RETcc
+// 0000 0010 1101 cccc
+// Return from subroutine if condition cc has been met. Pops stored PC
+// from call stack $st0 and sets $pc to this location.
+void ret(const UDSPInstruction& opc)
+{
+	if (CheckCondition(opc.hex & 0xf))
+	{
+		g_dsp.pc = dsp_reg_load_stack(DSP_STACK_C);
+	}
+}
+
+// RTI
+// 0000 0010 1111 1111
+// Return from exception. Pops stored status register $sr from data stack
+// $st1 and program counter PC from call stack $st0 and sets $pc to this
+// location.
+// FIXME: is it also conditional? unknown opcodes 0x02fx
+void rti(const UDSPInstruction& opc)
+{
+	g_dsp.r[DSP_REG_SR] = dsp_reg_load_stack(DSP_STACK_D);
+	g_dsp.pc = dsp_reg_load_stack(DSP_STACK_C);
+
+	g_dsp.exception_in_progress_hack = false;
+}
+
+// HALT
+// 0000 0000 0020 0001 
+// Stops execution of DSP code. Sets bit DSP_CR_HALT in register DREG_CR.
+void halt(const UDSPInstruction& opc)
+{
+	g_dsp.cr |= 0x4;
+	g_dsp.pc--;
+}
+
+
+// LOOP handling: Loop stack is used to control execution of repeated blocks of
+// instructions. Whenever there is value on stack $st2 and current PC is equal
+// value at $st2, then value at stack $st3 is decremented. If value is not zero
+// then PC is modified with calue from call stack $st0. Otherwise values from
+// callstack $st0 and both loop stacks $st2 and $st3 are poped and execution
+// continues at next opcode.
+
+
+// LOOP $R
+// 0000 0000 010r rrrr
+// Repeatedly execute following opcode until counter specified by value
+// from register $R reaches zero. Each execution decrement counter. Register
+// $R remains unchanged. If register $R is set to zero at the beginning of loop
+// then looped instruction will not get executed.
+// Actually, this instruction simply prepares the loop stacks for the above.
+// The looping hardware takes care of the rest.
+void loop(const UDSPInstruction& opc)
+{
+	u16 reg = opc.hex & 0x1f;
+	u16 cnt = g_dsp.r[reg];
+	u16 loop_pc = g_dsp.pc;
+
+	if (cnt)
+	{
+		dsp_reg_store_stack(0, g_dsp.pc);
+		dsp_reg_store_stack(2, loop_pc);
+		dsp_reg_store_stack(3, cnt);
+	}
+}
+
+// LOOPI #I
+// 0001 0000 iiii iiii
+// Repeatedly execute following opcode until counter specified by
+// immediate value I reaches zero. Each execution decrement counter. If
+// immediate value I is set to zero at the beginning of loop then looped
+// instruction will not get executed.
+// Actually, this instruction simply prepares the loop stacks for the above.
+// The looping hardware takes care of the rest.
+void loopi(const UDSPInstruction& opc)
+{
+	u16 cnt = opc.hex & 0xff;
+	u16 loop_pc = g_dsp.pc;
+
+	if (cnt)
+	{
+		dsp_reg_store_stack(0, g_dsp.pc);
+		dsp_reg_store_stack(2, loop_pc);
+		dsp_reg_store_stack(3, cnt);
+	}
+}
+
+
+// BLOOP $R, addrA
+// 0000 0000 011r rrrr
+// aaaa aaaa aaaa aaaa
+// Repeatedly execute block of code starting at following opcode until
+// counter specified by value from register $R reaches zero. Block ends at
+// specified address addrA inclusive, ie. opcode at addrA is the last opcode
+// included in loop. Counter is pushed on loop stack $st3, end of block address
+// is pushed on loop stack $st2 and repeat address is pushed on call stack $st0.
+// Up to 4 nested loops is allowed.
+void bloop(const UDSPInstruction& opc)
+{
+	u16 reg = opc.hex & 0x1f;
+	u16 cnt = g_dsp.r[reg];
+	u16 loop_pc = dsp_fetch_code();
+
+	if (cnt)
+	{
+		dsp_reg_store_stack(0, g_dsp.pc);
+		dsp_reg_store_stack(2, loop_pc);
+		dsp_reg_store_stack(3, cnt);
+	}
+	else
+	{
+		g_dsp.pc = loop_pc;
+		g_dsp.pc += opSize[dsp_peek_code()];
+	}
+}
+
+// BLOOPI #I, addrA
+// 0001 0001 iiii iiii
+// aaaa aaaa aaaa aaaa
+// Repeatedly execute block of code starting at following opcode until
+// counter specified by immediate value I reaches zero. Block ends at specified
+// address addrA inclusive, ie. opcode at addrA is the last opcode included in
+// loop. Counter is pushed on loop stack $st3, end of block address is pushed
+// on loop stack $st2 and repeat address is pushed on call stack $st0. Up to 4
+// nested loops is allowed.
+void bloopi(const UDSPInstruction& opc)
+{
+	u16 cnt = opc.hex & 0xff;
+	u16 loop_pc = dsp_fetch_code();
+
+	if (cnt)
+	{
+		dsp_reg_store_stack(0, g_dsp.pc);
+		dsp_reg_store_stack(2, loop_pc);
+		dsp_reg_store_stack(3, cnt);
+	}
+	else
+	{
+		g_dsp.pc = loop_pc;
+		g_dsp.pc += opSize[dsp_peek_code()];
+	}
+}
+
+}  // namespace