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cheats: add notes for C4 and C5 codes (won't be implemented until needed) and implement C6 code (only for v1.54 ARDS)

This commit is contained in:
zeromus 2016-11-29 14:40:14 -06:00
parent 6abf2b3454
commit 3da9f273d2
1 changed files with 27 additions and 1 deletions
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26
desmume/src/cheatSystem.cpp
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@ -78,6 +78,7 @@ void CHEATS::ARparser(CHEATS_LIST& list)
{ {
//primary organizational source (seems to be referenced by cheaters the most) - http://doc.kodewerx.org/hacking_nds.html //primary organizational source (seems to be referenced by cheaters the most) - http://doc.kodewerx.org/hacking_nds.html
//secondary clarification and details (for programmers) - http://problemkaputt.de/gbatek.htm#dscartcheatactionreplayds //secondary clarification and details (for programmers) - http://problemkaputt.de/gbatek.htm#dscartcheatactionreplayds
//more here: http://www.kodewerx.org/forum/viewtopic.php?t=98
//general note: gbatek is more precise with the maths; it does not indicate any special wraparound/masking behaviour so it's assumed to be standard 32bit masking //general note: gbatek is more precise with the maths; it does not indicate any special wraparound/masking behaviour so it's assumed to be standard 32bit masking
//general note: <gbatek> For all word/halfword accesses, the address should be aligned accordingly -- OR ELSE WHAT? (probably the default behaviour of our MMU interface) //general note: <gbatek> For all word/halfword accesses, the address should be aligned accordingly -- OR ELSE WHAT? (probably the default behaviour of our MMU interface)
@ -310,6 +311,31 @@ void CHEATS::ARparser(CHEATS_LIST& list)
st.loop.status = st.status; st.loop.status = st.status;
break; break;
case 0xC4:
//Rewrite Code (v1.54 only) (trainer toolkit codes)
//<gbatek> offset = address of the C4000000 code
//it seems this lets us rewrite the code at runtime. /his will be very difficult to emulate.
//But it would be possible: we could copy whenever it's activated and allow that to be rewritten
//we would try to select a special sentinel pointer which couldn't be confused for a useful address
if(!v154) break;
CHEATLOG("Unsupported C4 code");
break;
case 0xC5:
//If Counter (trainer toolkit codes)
//counter=counter+1, IF (counter AND YYYY) = XXXX ;v1.54
//http://www.kodewerx.org/forum/viewtopic.php?t=98 has more details, but this can't be executed readily without adding something to the cheat engine
if(!v154) break;
CHEATLOG("Unsupported C5 code");
break;
case 0xC6:
//Store Offset (trainer toolkit codes)
//<gbatek> C6000000 XXXXXXXX [XXXXXXXX]=offset
if(!v154) break;
x = lo;
_MMU_write32<ARMCPU_ARM7,MMU_AT_DEBUG>(x, st.offset);
break;
case 0xD0: case 0xD0:
//Terminator (Special Codes) //Terminator (Special Codes)