piwalker/melonDS
1
0
Fork 0
mirror of https://github.com/melonDS-emu/melonDS.git synced 2025-07-24 14:49:53 -06:00
Code Issues Packages Projects Releases Wiki Activity

start refactoring shit: more accurate timing and way of counting cycles.

Browse Source
This commit is contained in:
StapleButter
2017-01-30 18:36:11 +01:00
parent 296212ac49
commit 6f3b0498db
17 changed files with 636 additions and 595 deletions
Download Patch File Download Diff File Expand all files Collapse all files

145
ARM.cpp
View File

@ -47,6 +47,97 @@ ARM::ARM(u32 num)
{
// well uh
Num = num;
for (int i = 0; i < 16; i++)
{
Waitstates[0][i] = 1;
Waitstates[1][i] = 1;
Waitstates[2][i] = 1;
Waitstates[3][i] = 1;
}
if (!num)
{
// ARM9
Waitstates[0][0x2] = 1; // main RAM timing, assuming cache hit
Waitstates[0][0x3] = 4;
Waitstates[0][0x4] = 4;
Waitstates[0][0x5] = 5;
Waitstates[0][0x6] = 5;
Waitstates[0][0x7] = 4;
Waitstates[0][0x8] = 19;
Waitstates[0][0x9] = 19;
Waitstates[0][0xF] = 4;
Waitstates[1][0x2] = 1;
Waitstates[1][0x3] = 8;
Waitstates[1][0x4] = 8;
Waitstates[1][0x5] = 10;
Waitstates[1][0x6] = 10;
Waitstates[1][0x7] = 8;
Waitstates[1][0x8] = 38;
Waitstates[1][0x9] = 38;
Waitstates[1][0xF] = 8;
Waitstates[2][0x2] = 1;
Waitstates[2][0x3] = 2;
Waitstates[2][0x4] = 2;
Waitstates[2][0x5] = 2;
Waitstates[2][0x6] = 2;
Waitstates[2][0x7] = 2;
Waitstates[2][0x8] = 12;
Waitstates[2][0x9] = 12;
Waitstates[2][0xA] = 20;
Waitstates[2][0xF] = 2;
Waitstates[3][0x2] = 1;
Waitstates[3][0x3] = 2;
Waitstates[3][0x4] = 2;
Waitstates[3][0x5] = 4;
Waitstates[3][0x6] = 4;
Waitstates[3][0x7] = 2;
Waitstates[3][0x8] = 24;
Waitstates[3][0x9] = 24;
Waitstates[3][0xA] = 20;
Waitstates[3][0xF] = 2;
}
else
{
// ARM7
Waitstates[0][0x0] = 1;
Waitstates[0][0x2] = 1;
Waitstates[0][0x3] = 1;
Waitstates[0][0x4] = 1;
Waitstates[0][0x6] = 1;
Waitstates[0][0x8] = 6;
Waitstates[0][0x9] = 6;
Waitstates[1][0x0] = 1;
Waitstates[1][0x2] = 2;
Waitstates[1][0x3] = 1;
Waitstates[1][0x4] = 1;
Waitstates[1][0x6] = 2;
Waitstates[1][0x8] = 12;
Waitstates[1][0x9] = 12;
Waitstates[2][0x0] = 1;
Waitstates[2][0x2] = 1;
Waitstates[2][0x3] = 1;
Waitstates[2][0x4] = 1;
Waitstates[2][0x6] = 1;
Waitstates[2][0x8] = 6;
Waitstates[2][0x9] = 6;
Waitstates[2][0xA] = 10;
Waitstates[3][0x0] = 1;
Waitstates[3][0x2] = 2;
Waitstates[3][0x3] = 1;
Waitstates[3][0x4] = 1;
Waitstates[3][0x6] = 2;
Waitstates[3][0x8] = 12;
Waitstates[3][0x9] = 12;
Waitstates[3][0xA] = 10;
}
}
ARM::~ARM()
@ -83,21 +174,23 @@ void ARM::JumpTo(u32 addr, bool restorecpsr)
if (addr == 0x02000800)
{
printf("!!!!!!!! %08X\n", R[15]);
printf("%08X %08X %08X %08X\n", Read32(0x02000000), Read32(0x0200000C), Read32(0x02000800), Read32(0x02000804));
//printf("%08X %08X %08X %08X\n", Read32(0x02000000), Read32(0x0200000C), Read32(0x02000800), Read32(0x02000804));
}
if (addr & 0x1)
{
addr &= ~0x1;
R[15] = addr+2;
NextInstr = Read16(addr);
NextInstr[0] = CodeRead16(addr);
NextInstr[1] = CodeRead16(addr+2);
CPSR |= 0x20;
}
else
{
addr &= ~0x3;
R[15] = addr+4;
NextInstr = Read32(addr);
NextInstr[0] = CodeRead32(addr);
NextInstr[1] = CodeRead32(addr+4);
CPSR &= ~0x20;
}
}
@ -227,67 +320,65 @@ void ARM::TriggerIRQ()
JumpTo(ExceptionBase + 0x18);
}
s32 ARM::Execute(s32 cycles)
s32 ARM::Execute(s32 cyclestorun)
{
if (Halted)
{
if (NDS::HaltInterrupted(Num))
Halted = 0;
else
return cycles;
{
Cycles = cyclestorun;
return Cycles;
}
}
s32 cyclesrun = 0;
Cycles = 0;
u32 addr = R[15] - (CPSR&0x20 ? 4:8);
u32 cpsr = CPSR;
while (cyclesrun < cycles)
while (Cycles < cyclestorun)
{
//if(Num==1)printf("%08X %08X\n", R[15] - (CPSR&0x20 ? 4:8), NextInstr);
if (CPSR & 0x20) // THUMB
{
// prefetch
CurInstr = NextInstr;
NextInstr = Read16(R[15]);
//cyclesrun += MemWaitstate(0, R[15]);
R[15] += 2;
Cycles = cyclesrun;
CurInstr = NextInstr[0];
NextInstr[0] = NextInstr[1];
NextInstr[1] = CodeRead16(R[15]);
// actually execute
u32 icode = (CurInstr >> 6);
cyclesrun += ARMInterpreter::THUMBInstrTable[icode](this);
ARMInterpreter::THUMBInstrTable[icode](this);
}
else
{
// prefetch
CurInstr = NextInstr;
NextInstr = Read32(R[15]);
//cyclesrun += MemWaitstate(1, R[15]);
R[15] += 4;
Cycles = cyclesrun;
CurInstr = NextInstr[0];
NextInstr[0] = NextInstr[1];
NextInstr[1] = CodeRead32(R[15]);
// actually execute
if (CheckCondition(CurInstr >> 28))
{
u32 icode = ((CurInstr >> 4) & 0xF) | ((CurInstr >> 16) & 0xFF0);
cyclesrun += ARMInterpreter::ARMInstrTable[icode](this);
ARMInterpreter::ARMInstrTable[icode](this);
}
else if ((CurInstr & 0xFE000000) == 0xFA000000)
{
cyclesrun += ARMInterpreter::A_BLX_IMM(this);
}
else
{
// not executing it. oh well
cyclesrun += 1; // 1S. todo: check
ARMInterpreter::A_BLX_IMM(this);
}
}
// TODO optimize this shit!!!
if (Halted) return cycles;
if (Halted)
{
Cycles = cyclestorun;
return Cycles;
}
if (NDS::HaltInterrupted(Num))
{
if (NDS::IME[Num]&1)
@ -299,5 +390,5 @@ s32 ARM::Execute(s32 cycles)
cpsr = CPSR;
}
return cyclesrun;
return Cycles;
}