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/*====================================================================
filename: gdsp_interpreter.cpp
project: GCemu
created: 2004-6-18
mail: duddie@walla.com
Copyright (c) 2005 Duddie & Tratax
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 <stdio.h>
#include <stdlib.h>
#include "DSPTables.h"
#include "DSPHost.h"
#include "DSPCore.h"
#include "DSPAnalyzer.h"
#include "DSPHWInterface.h"
#include "DSPIntUtil.h"
namespace DSPInterpreter {
volatile u32 gdsp_running;
// NOTE: These have nothing to do with g_dsp.r[DSP_REG_CR].
// Hm, should instructions that change CR use this? Probably not (but they
// should call UpdateCachedCR())
void WriteCR(u16 val)
{
// reset
if (val & 0x0001)
{
DSPCore_Reset();
}
val &= ~0x0001;
// update cr
g_dsp.cr = val;
}
// Hm, should instructions that read CR use this? (Probably not).
u16 ReadCR()
{
if (g_dsp.pc & 0x8000)
{
g_dsp.cr |= 0x800;
}
else
{
g_dsp.cr &= ~0x800;
}
return g_dsp.cr;
}
void Step()
{
DSPCore_CheckExceptions();
g_dsp.step_counter++;
#if PROFILE
g_dsp.err_pc = g_dsp.pc;
ProfilerAddDelta(g_dsp.err_pc, 1);
if (g_dsp.step_counter == 1)
{
ProfilerInit();
}
if ((g_dsp.step_counter & 0xFFFFF) == 0)
{
ProfilerDump(g_dsp.step_counter);
}
#endif
/*
//Pikmin GC (US)
if (g_dsp.pc == 0x0506)
NOTICE_LOG(DSPLLE,"-> FORMAT JUMPTABLE --> pc:=%04x,ac0.m:=%04x,ac1.m:=%04x", g_dsp.pc, dsp_get_acc_m(0), dsp_get_acc_m(1));
*/
u16 opc = dsp_fetch_code();
ExecuteInstruction(UDSPInstruction(opc));
HandleLoop();
}
// Used by thread mode.
void Run()
{
gdsp_running = true;
while (!(g_dsp.cr & CR_HALT))
{
// Are we running?
if (DSPHost_Running() && !DSPHost_OnThread())
break;
// This number (500) is completely arbitrary. TODO: tweak.
RunCyclesDebug(500);
if (!gdsp_running)
break;
}
gdsp_running = false;
}
// This one has basic idle skipping, and checks breakpoints.
int RunCyclesDebug(int cycles)
{
// First, let's run a few cycles with no idle skipping so that things can
// progress a bit.
for (int i = 0; i < 8; i++)
{
if (g_dsp.cr & CR_HALT)
return 0;
if (dsp_breakpoints.IsAddressBreakPoint(g_dsp.pc))
{
DSPCore_SetState(DSPCORE_STEPPING);
return cycles;
}
Step();
cycles--;
if (cycles < 0)
return 0;
}
DSPCore_CheckExternalInterrupt();
// Now, let's run a few cycles with idle skipping.
for (int i = 0; i < 8; i++)
{
if (g_dsp.cr & CR_HALT)
return 0;
if (dsp_breakpoints.IsAddressBreakPoint(g_dsp.pc))
{
DSPCore_SetState(DSPCORE_STEPPING);
return cycles;
}
// Idle skipping.
if (DSPAnalyzer::code_flags[g_dsp.pc] & DSPAnalyzer::CODE_IDLE_SKIP)
return 0;
Step();
cycles--;
if (cycles < 0)
return 0;
}
// Finally, run the rest of the block without.
while (cycles > 0)
{
if (dsp_breakpoints.IsAddressBreakPoint(g_dsp.pc))
{
DSPCore_SetState(DSPCORE_STEPPING);
return cycles;
}
Step();
cycles--;
}
return cycles;
}
// Used by non-thread mode. Meant to be efficient.
int RunCycles(int cycles)
{
DSPCore_CheckExternalInterrupt();
if (cycles < 18)
{
for (int i = 0; i < cycles; i++)
{
if (g_dsp.cr & CR_HALT)
return 0;
if (DSPAnalyzer::code_flags[g_dsp.pc] & DSPAnalyzer::CODE_IDLE_SKIP)
return 0;
Step();
cycles--;
}
return cycles;
}
DSPCore_CheckExternalInterrupt();
// First, let's run a few cycles with no idle skipping so that things can progress a bit.
for (int i = 0; i < 8; i++)
{
if (g_dsp.cr & CR_HALT)
return 0;
Step();
cycles--;
}
// Next, let's run a few cycles with idle skipping, so that we can skip
// idle loops.
for (int i = 0; i < 8; i++)
{
if (g_dsp.cr & CR_HALT)
return 0;
if (DSPAnalyzer::code_flags[g_dsp.pc] & DSPAnalyzer::CODE_IDLE_SKIP)
return 0;
Step();
cycles--;
}
// Now, run the rest of the block without idle skipping. It might trip into
// a idle loop and if so we waste some time here. Might be beneficial to
// slice even further.
while (cycles > 0)
{
Step();
cycles--;
// We don't bother directly supporting pause - if the main emu pauses,
// it just won't call this function anymore.
}
return cycles;
}
void Stop()
{
gdsp_running = false;
}
} // namespace
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