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finish the AR interpreter, I guess

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or mostly
This commit is contained in:
Arisotura 2020-02-15 00:36:22 +01:00
parent 85a6a5bb38
commit 51dbb7165e
1 changed files with 85 additions and 8 deletions
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93
src/AREngine.cpp
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@ -101,7 +101,7 @@ void Reset()
TEMP_PUTCODE(0x10000672 , 0x00000000);
TEMP_PUTCODE(0xD2000000 , 0x00000000);*/
// SM64DS EUR swim through floor
TEMP_PUTCODE(0x927FFFA8 , 0xFBFF0000); // IF 0000 = ((~FBFF) & u16[027FFFA8])
/*TEMP_PUTCODE(0x927FFFA8 , 0xFBFF0000); // IF 0000 = ((~FBFF) & u16[027FFFA8])
TEMP_PUTCODE(0x823FDFF8 , 0xFBFF0000); // IF 0000 < ((~FBFF) & u16[023FDFF8])
TEMP_PUTCODE(0xDA000000 , 0x023FDFFA); // datareg = u16[023FDFFA + offset]
TEMP_PUTCODE(0xD4000000 , 0x00000001); // datareg += 1
@ -118,9 +118,21 @@ void Reset()
TEMP_PUTCODE(0xD0000000 , 0x00000000); // ENDIF
TEMP_PUTCODE(0x927FFFA8 , 0xFBFF0000); // IF 0000 = ((~FBFF) & u16[027FFFA8])
TEMP_PUTCODE(0x02037E7C , 0xE3A000FF); // u32[02037E7C] = E3A000FF
TEMP_PUTCODE(0xD2000000 , 0x00000000); // NEXT/FLUSH
TEMP_PUTCODE(0xD2000000 , 0x00000000); // NEXT/FLUSH*/
// MKDS EUR shitty CPU-stalker code
/*TEMP_PUTCODE(0x94000130 , 0xFEBB0000);
TEMP_PUTCODE(0x023CDD4C , 0x00000001);
TEMP_PUTCODE(0xD2000000 , 0x00000000);
TEMP_PUTCODE(0x923CDD4C , 0x00000001);
TEMP_PUTCODE(0x6217AD18 , 0x00000000);
TEMP_PUTCODE(0xB217AD18 , 0x00000000);
TEMP_PUTCODE(0xC0000000 , 0x00000002);
TEMP_PUTCODE(0xD9000000 , 0x00000628);
TEMP_PUTCODE(0xD6000000 , 0x00000080);
TEMP_PUTCODE(0xDC000000 , 0x00000000);
TEMP_PUTCODE(0xD2000000 , 0x00000000);
entry->Enabled = true;
NumCheatCodes++;
NumCheatCodes++;*/
}
@ -139,6 +151,14 @@ void RunCheat(CheatEntry* entry)
u32 cond = 1;
u32 condstack = 0;
u32* loopstart = code;
u32 loopcount = 0;
u32 loopcond = 1;
u32 loopcondstack = 0;
// TODO: does anything reset this??
u32 c5count = 0;
for (;;)
{
u32 a = *code++;
@ -275,17 +295,74 @@ void RunCheat(CheatEntry* entry)
offset = NDS::ARM7Read32((a & 0x0FFFFFFF) + offset);
break;
case 0xC0: // FOR 0..b
loopstart = code; // points to the first opcode after the FOR
loopcount = b;
loopcond = cond; // checkme
loopcondstack = condstack; // (GBAtek is not very clear there)
break;
case 0xC4: // offset = pointer to C4000000 opcode
// theoretically used for safe storage, by accessing [offset+4]
// in practice could be used for a self-modifying AR code
// could be implemented with some hackery, but, does anything even
// use it??
printf("AR: !! THE FUCKING C4000000 OPCODE. TELL ARISOTURA.\n");
return;
case 0xC5: // count++ / IF (count & b.l) == b.h
{
// with weird condition checking, apparently
// oh well
c5count++;
if (!cond) break;
condstack <<= 1;
condstack |= cond;
u16 mask = b & 0xFFFF;
u16 chk = b >> 16;
cond = ((c5count & mask) == chk) ? 1:0;
}
break;
case 0xC6: // u32[b] = offset
NDS::ARM7Write32(b, offset);
break;
case 0xD0: // ENDIF
cond = condstack & 0x1;
condstack >>= 1;
break;
case 0xD1: // NEXT
if (loopcount > 0)
{
loopcount--;
code = loopstart;
}
else
{
cond = loopcond;
condstack = loopcondstack;
}
break;
case 0xD2: // NEXT+FLUSH
// TODO: loop shenanigans!
offset = 0;
datareg = 0;
condstack = 0;
cond = 1;
if (loopcount > 0)
{
loopcount--;
code = loopstart;
}
else
{
offset = 0;
datareg = 0;
condstack = 0;
cond = 1;
}
break;
case 0xD3: // offset = b