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// Copyright (C) 2010 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/
#include <cstring>
#include "DSPEmitter.h"
#include "DSPMemoryMap.h"
#include "DSPCore.h"
#include "DSPInterpreter.h"
#include "DSPAnalyzer.h"
#include "x64Emitter.h"
#include "ABI.h"
#define BLOCK_SIZE 250
using namespace Gen;
DSPEmitter::DSPEmitter()
{
m_compiledCode = NULL;
AllocCodeSpace(COMPILED_CODE_SIZE);
blocks = new CompiledCode[MAX_BLOCKS];
endBlock = new bool[MAX_BLOCKS];
for(int i = 0x0000; i < MAX_BLOCKS; i++)
{
blocks[i] = CompileCurrent;
blockSize[i] = 0;
endBlock[i] = false;
}
}
DSPEmitter::~DSPEmitter()
{
delete[] blocks;
delete[] endBlock;
FreeCodeSpace();
}
void DSPEmitter::ClearIRAM() {
// TODO: Does not clear codespace
for(int i = 0x0000; i < 0x1000; i++)
{
blocks[i] = CompileCurrent;
blockSize[i] = 0;
endBlock[i] = false;
}
}
void DSPEmitter::WriteCallInterpreter(UDSPInstruction inst)
{
const DSPOPCTemplate *tinst = GetOpTemplate(inst);
// Call extended
if (tinst->extended) {
if ((inst >> 12) == 0x3) {
if (! extOpTable[inst & 0x7F]->jitFunc) {
ABI_CallFunctionC16((void*)extOpTable[inst & 0x7F]->intFunc, inst);
} else {
(this->*extOpTable[inst & 0x7F]->jitFunc)(inst);
}
} else {
if (!extOpTable[inst & 0xFF]->jitFunc) {
ABI_CallFunctionC16((void*)extOpTable[inst & 0xFF]->intFunc, inst);
} else {
(this->*extOpTable[inst & 0xFF]->jitFunc)(inst);
}
}
}
// Main instruction
if (!opTable[inst]->jitFunc)
ABI_CallFunctionC16((void*)opTable[inst]->intFunc, inst);
else
(this->*opTable[inst]->jitFunc)(inst);
// Backlog
// TODO if for jit
if (tinst->extended) {
ABI_CallFunction((void*)applyWriteBackLog);
}
}
void DSPEmitter::unknown_instruction(UDSPInstruction inst)
{
PanicAlert("unknown_instruction %04x - Fix me ;)", inst);
}
void DSPEmitter::Default(UDSPInstruction _inst)
{
WriteCallInterpreter(_inst);
}
const u8 *DSPEmitter::Compile(int start_addr) {
AlignCode16();
const u8 *entryPoint = GetCodePtr();
ABI_PushAllCalleeSavedRegsAndAdjustStack();
int addr = start_addr;
while (addr < start_addr + BLOCK_SIZE)
{
UDSPInstruction inst = dsp_imem_read(addr);
const DSPOPCTemplate *opcode = GetOpTemplate(inst);
// Check for interrupts and exceptions
TEST(8, M(&g_dsp.exceptions), Imm8(0xff));
FixupBranch skipCheck = J_CC(CC_Z);
ABI_CallFunction((void *)&DSPCore_CheckExceptions);
MOV(32, R(EAX), M(&g_dsp.exception_in_progress));
CMP(32, R(EAX), Imm32(0));
FixupBranch noExceptionOccurred = J_CC(CC_L);
ABI_CallFunction((void *)DSPInterpreter::HandleLoop);
ABI_PopAllCalleeSavedRegsAndAdjustStack();
RET();
SetJumpTarget(skipCheck);
SetJumpTarget(noExceptionOccurred);
// Increment PC
ADD(16, M(&(g_dsp.pc)), Imm16(1));
WriteCallInterpreter(inst);
blockSize[start_addr]++;
// Handle loop condition. Change to TEST
MOVZX(32, 16, EAX, M(&(g_dsp.r[DSP_REG_ST2])));
CMP(32, R(EAX), Imm32(0));
FixupBranch rLoopAddressExit = J_CC(CC_LE);
MOVZX(32, 16, EAX, M(&(g_dsp.r[DSP_REG_ST3])));
CMP(32, R(EAX), Imm32(0));
FixupBranch rLoopCounterExit = J_CC(CC_LE);
// These functions branch and therefore only need to be called in the end
// of each block and in this order
ABI_CallFunction((void *)&DSPInterpreter::HandleLoop);
ABI_PopAllCalleeSavedRegsAndAdjustStack();
RET();
SetJumpTarget(rLoopAddressExit);
SetJumpTarget(rLoopCounterExit);
// End the block where the loop ends
if ((inst & 0xffe0) == 0x0060 || (inst & 0xff00) == 0x1100) {
// BLOOP, BLOOPI
endBlock[dsp_imem_read(addr + 1)] = true;
} else if ((inst & 0xffe0) == 0x0040 || (inst & 0xff00) == 0x1000) {
// LOOP, LOOPI
endBlock[addr + 1] = true;
}
if (opcode->branch || endBlock[addr]
|| DSPAnalyzer::code_flags[addr] & DSPAnalyzer::CODE_IDLE_SKIP)
break;
addr += opcode->size;
}
ABI_PopAllCalleeSavedRegsAndAdjustStack();
RET();
blocks[start_addr] = (CompiledCode)entryPoint;
return entryPoint;
}
void STACKALIGN DSPEmitter::RunBlock(int cycles)
{
static int idleskip = 0;
// Trigger an external interrupt at the start of the cycle
u16 block_cycles = 501;
while (!(g_dsp.cr & CR_HALT))
{
if (block_cycles > 500)
{
if(g_dsp.cr & CR_EXTERNAL_INT)
DSPCore_CheckExternalInterrupt();
block_cycles = 0;
}
// Compile the block if needed
if (blocks[g_dsp.pc] == CompileCurrent)
{
blockSize[g_dsp.pc] = 0;
blocks[g_dsp.pc]();
}
// Execute the block if we have enough cycles
if (cycles > blockSize[g_dsp.pc])
{
u16 start_addr = g_dsp.pc;
if (idleskip % 100 > 95 && (DSPAnalyzer::code_flags[g_dsp.pc] & DSPAnalyzer::CODE_IDLE_SKIP)) {
block_cycles = 0;
} else
blocks[g_dsp.pc]();
idleskip++;
if (idleskip % 500 == 0)
idleskip = 0;
block_cycles += blockSize[start_addr];
cycles -= blockSize[start_addr];
}
else {
break;
}
}
}
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