piwalker/melonDS
1
0
Fork 0
mirror of https://github.com/melonDS-emu/melonDS.git synced 2025-07-22 22:01:06 -06:00
Code Issues Packages Projects Releases Wiki Activity

add PoC ARM9 instruction cache logic. not actually in use, but it's there as a reference (and if we ever need it).

Browse Source
This commit is contained in:
StapleButter
2019-01-04 21:47:06 +01:00
parent 1e35d18ce6
commit 90f2c0834e
3 changed files with 172 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
src/ARM.cpp
View File

@ -176,14 +176,14 @@ void ARMv5::JumpTo(u32 addr, bool restorecpsr)
//if (addr == 0x0201764C) printf("capture test %d: R1=%08X\n", R[6], R[1]);
//if (addr == 0x020175D8) printf("capture test %d: res=%08X\n", R[6], R[0]);
// R0=DMA# R1=src R2=size
//if (addr==0x02019A88) printf("[%08X] [%03d] GX FIFO CMD %08X\n", R[15], NDS::ARM9Read16(0x04000006), R[0]);
//if (addr==0x02022A5C) printf("[%08X] [%03d|%04X] RENDE SHITO %08X\n", R[15], NDS::ARM9Read16(0x04000006), NDS::ARM9Read16(0x04000304), R[0]);
u32 oldregion = R[15] >> 24;
u32 newregion = addr >> 24;
RegionCodeCycles = MemTimings[addr >> 12][0];
s32 cycles;
if (addr & 0x1)
{
addr &= ~0x1;
@ -195,15 +195,16 @@ void ARMv5::JumpTo(u32 addr, bool restorecpsr)
// doesn't matter if we put garbage in the MSbs there
if (addr & 0x2)
{
NextInstr[0] = CodeRead32(addr-2) >> 16;
NextInstr[1] = CodeRead32(addr+2);
cycles = CodeCycles * 2;
NextInstr[0] = CodeRead32(addr-2, true) >> 16;
Cycles += CodeCycles;
NextInstr[1] = CodeRead32(addr+2, false);
Cycles += CodeCycles;
}
else
{
NextInstr[0] = CodeRead32(addr);
NextInstr[0] = CodeRead32(addr, true);
NextInstr[1] = NextInstr[0] >> 16;
cycles = CodeCycles;
Cycles += CodeCycles;
}
CPSR |= 0x20;
@ -215,9 +216,10 @@ void ARMv5::JumpTo(u32 addr, bool restorecpsr)
if (newregion != oldregion) SetupCodeMem(addr);
NextInstr[0] = CodeRead32(addr);
NextInstr[1] = CodeRead32(addr+4);
cycles = CodeCycles * 2;
NextInstr[0] = CodeRead32(addr, true);
Cycles += CodeCycles;
NextInstr[1] = CodeRead32(addr+4, false);
Cycles += CodeCycles;
CPSR &= ~0x20;
}
@ -231,8 +233,6 @@ void ARMv5::JumpTo(u32 addr, bool restorecpsr)
PrefetchAbort();
return;
}*/
Cycles += cycles;
}
void ARMv4::JumpTo(u32 addr, bool restorecpsr)
@ -487,7 +487,7 @@ s32 ARMv5::Execute()
CurInstr = NextInstr[0];
NextInstr[0] = NextInstr[1];
if (R[15] & 0x2) { NextInstr[1] >>= 16; CodeCycles = 0; }
else NextInstr[1] = CodeRead32(R[15]);
else NextInstr[1] = CodeRead32(R[15], false);
// actually execute
u32 icode = (CurInstr >> 6) & 0x3FF;
@ -499,7 +499,7 @@ s32 ARMv5::Execute()
R[15] += 4;
CurInstr = NextInstr[0];
NextInstr[0] = NextInstr[1];
NextInstr[1] = CodeRead32(R[15]);
NextInstr[1] = CodeRead32(R[15], false);
// actually execute
if (CheckCondition(CurInstr >> 28))
@ -515,7 +515,7 @@ s32 ARMv5::Execute()
AddCycles_C();
}
//s32 diff = Cycles - lastcycles;arm9timer+=(diff>>1);
//s32 diff = Cycles - lastcycles;
//NDS::RunTightTimers(0, diff >> ClockShift);
//lastcycles = Cycles - (diff & ClockDiffMask);
@ -543,7 +543,7 @@ s32 ARMv5::Execute()
/*if (Cycles > lastcycles)
{
//s32 diff = Cycles - lastcycles;arm9timer+=(diff>>1);
s32 diff = Cycles - lastcycles;
//NDS::RunTightTimers(0, diff >> ClockShift);
}*/
#ifdef DEBUG_CHECK_DESYNC
@ -613,7 +613,7 @@ s32 ARMv4::Execute()
AddCycles_C();
}
//s32 diff = Cycles - lastcycles;arm7timer+=diff;
//s32 diff = Cycles - lastcycles;
//NDS::RunTightTimers(1, diff);
//lastcycles = Cycles;
@ -641,7 +641,7 @@ s32 ARMv4::Execute()
/*if (Cycles > lastcycles)
{
//s32 diff = Cycles - lastcycles;arm7timer+=(diff);
//s32 diff = Cycles - lastcycles;
//NDS::RunTightTimers(1, diff);
}*/