dolphin/Source/Core/DSPCore/Src/DSPInterpreter.cpp

250 lines
5.3 KiB
C++
Raw Normal View History

/*====================================================================
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 "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 & 1)
{
DSPCore_Reset();
val &= ~1;
}
// init - can reset and init be done at the same time?
else if (val == 4)
{
// this looks like a hack! OSInitAudioSystem ucode
// should send this mail - not dsp core itself
gdsp_mbox_write_h(GDSP_MBOX_DSP, 0x8054);
gdsp_mbox_write_l(GDSP_MBOX_DSP, 0x4348);
val |= 0x800;
}
// 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
u16 opc = dsp_fetch_code();
ExecuteInstruction(UDSPInstruction(opc));
if (DSPAnalyzer::code_flags[g_dsp.pc - 1] & DSPAnalyzer::CODE_LOOP_END)
HandleLoop();
}
// Used by thread mode.
void Run()
{
int checkInterrupt = 0;
gdsp_running = true;
while (!(g_dsp.cr & CR_HALT) && gdsp_running)
{
if (jit)
jit->RunForCycles(1);
else {
// Automatically let the other threads work if we're idle skipping
if(DSPAnalyzer::code_flags[g_dsp.pc] & DSPAnalyzer::CODE_IDLE_SKIP)
Common::YieldCPU();
Step();
// Turns out the less you check for external interrupts, the more
// sound you hear, and it becomes slower
checkInterrupt++;
if(checkInterrupt == 500) { // <-- Arbitrary number. TODO: tweak
DSPCore_CheckExternalInterrupt();
checkInterrupt = 0;
}
}
}
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();
while (true)
{
// 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 (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;
}
// Now, lets run some more without idle skipping.
for (int i = 0; i < 200; i++)
{
if (dsp_breakpoints.IsAddressBreakPoint(g_dsp.pc))
{
DSPCore_SetState(DSPCORE_STEPPING);
return cycles;
}
Step();
cycles--;
if (cycles < 0)
return 0;
// We don't bother directly supporting pause - if the main emu pauses,
// it just won't call this function anymore.
}
}
}
// Used by non-thread mode. Meant to be efficient.
int RunCycles(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;
Step();
cycles--;
if (cycles < 0)
return 0;
}
DSPCore_CheckExternalInterrupt();
while (true)
{
// 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;
// Idle skipping.
if (DSPAnalyzer::code_flags[g_dsp.pc] & DSPAnalyzer::CODE_IDLE_SKIP)
return 0;
Step();
cycles--;
if (cycles < 0)
return 0;
}
// Now, lets run some more without idle skipping.
for (int i = 0; i < 200; i++)
{
Step();
cycles--;
if (cycles < 0)
return 0;
// We don't bother directly supporting pause - if the main emu pauses,
// it just won't call this function anymore.
}
}
}
void Stop()
{
gdsp_running = false;
}
} // namespace