From 3da9f273d2e320c626360a458f8624ede4ec26af Mon Sep 17 00:00:00 2001
From: zeromus <zeromus@users.noreply.github.com>
Date: Tue, 29 Nov 2016 14:40:14 -0600
Subject: [PATCH] cheats: add notes for C4 and C5 codes (won't be implemented
until needed) and implement C6 code (only for v1.54 ARDS)
---
desmume/src/cheatSystem.cpp | 28 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)
diff --git a/desmume/src/cheatSystem.cpp b/desmume/src/cheatSystem.cpp
index b945fe534..91816d3d6 100644
--- a/desmume/src/cheatSystem.cpp
+++ b/desmume/src/cheatSystem.cpp
@@ -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
//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> For all word/halfword accesses, the address should be aligned accordingly -- OR ELSE WHAT? (probably the default behaviour of our MMU interface)
@@ -86,7 +87,7 @@ void CHEATS::ARparser(CHEATS_LIST& list)
//TODO: v154 special stuff
bool v154 = false; //not supported yet
-
+
struct {
//LSB is
u32 status;
@@ -310,6 +311,31 @@ void CHEATS::ARparser(CHEATS_LIST& list)
st.loop.status = st.status;
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:
//Terminator (Special Codes)