Jul -- General Game/ROM Hacking: OoT Debug ~ Roc's Feather

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Jul - General Game/ROM Hacking - OoT Debug ~ Roc's Feather

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Casis777
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Posted on 04-30-12 11:39:00 PM (last edited by Casis777 at 04-30-12 11:48:38 PM)

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I made this a couple of months ago... I might as well post it here:

Originally posted by Casis777

So if anyone had read the URA feedback topic (on the GCN) a few days ago, they might've seen me give a suggestion for Roc's Feather to be used as an item. Basically, it allows you to jump whenever you want.

Well, I decided to try and recreate the "Replace Roll with Jump" GS code in C and modify it a little by making it still possible to Roll and to only be able to jump when the Lens of Truth is equipped. The results can be seen below in the video:

http://www.youtube.com/watch?v=jLNIoaAhMOY

~~At the moment there is only a GS code.~~ It can be seen in either of the two spoilers below.
^^ See bottom of post.

Nemu GS Code (the cheat number probably has to be formatted):

CheatName0=Roc's Feather

CheatName0Code0=811064B0 0818

CheatName0Code1=811064B2 0000

CheatName0Code2=81600000 27BD

CheatName0Code3=81600002 FFE0

CheatName0Code4=81600004 AFBE

CheatName0Code5=81600006 001C

CheatName0Code6=81600008 03A0

CheatName0Code7=8160000A F021

CheatName0Code8=8160000C 3C1C

CheatName0Code9=8160000E 8060

CheatName0Code10=81600010 279C

CheatName0Code11=81600012 0170

CheatName0Code12=81600014 3C02

CheatName0Code13=81600016 8022

CheatName0Code14=81600018 3442

CheatName0Code15=8160001A 4610

CheatName0Code16=8160001C AFC2

CheatName0Code17=8160001E 0010

CheatName0Code18=81600020 3C02

CheatName0Code19=81600022 8015

CheatName0Code20=81600024 3442

CheatName0Code21=81600026 E6C9

CheatName0Code22=81600028 AFC2

CheatName0Code23=8160002A 000C

CheatName0Code24=8160002C 3C02

CheatName0Code25=8160002E 8016

CheatName0Code26=81600030 3442

CheatName0Code27=81600032 6AF0

CheatName0Code28=81600034 AFC2

CheatName0Code29=81600036 0008

CheatName0Code30=81600038 3C02

CheatName0Code31=8160003A 8060

CheatName0Code32=8160003C 3442

CheatName0Code33=8160003E 0180

CheatName0Code34=81600040 AFC2

CheatName0Code35=81600042 0000

CheatName0Code36=81600044 8FC2

CheatName0Code37=81600046 000C

CheatName0Code38=81600048 9043

CheatName0Code39=8160004A 0000

CheatName0Code40=8160004C 2402

CheatName0Code41=8160004E 000F

CheatName0Code42=81600050 1462

CheatName0Code43=81600052 0004

CheatName0Code44=81600054 0000

CheatName0Code45=81600056 0000

CheatName0Code46=81600058 2402

CheatName0Code47=8160005A 0200

CheatName0Code48=8160005C 0818

CheatName0Code49=8160005E 002A

CheatName0Code50=81600060 A7C2

CheatName0Code51=81600062 0004

CheatName0Code52=81600064 8FC2

CheatName0Code53=81600066 000C

CheatName0Code54=81600068 2442

CheatName0Code55=8160006A 0001

CheatName0Code56=8160006C 9043

CheatName0Code57=8160006E 0000

CheatName0Code58=81600070 2402

CheatName0Code59=81600072 000F

CheatName0Code60=81600074 1462

CheatName0Code61=81600076 0004

CheatName0Code62=81600078 0000

CheatName0Code63=8160007A 0000

CheatName0Code64=8160007C 2402

CheatName0Code65=8160007E 0400

CheatName0Code66=81600080 0818

CheatName0Code67=81600082 002A

CheatName0Code68=81600084 A7C2

CheatName0Code69=81600086 0004

CheatName0Code70=81600088 8FC2

CheatName0Code71=8160008A 000C

CheatName0Code72=8160008C 2442

CheatName0Code73=8160008E 0002

CheatName0Code74=81600090 9043

CheatName0Code75=81600092 0000

CheatName0Code76=81600094 2402

CheatName0Code77=81600096 000F

CheatName0Code78=81600098 1462

CheatName0Code79=8160009A 002F

CheatName0Code80=8160009C 0000

CheatName0Code81=8160009E 0000

CheatName0Code82=816000A0 2402

CheatName0Code83=816000A2 0100

CheatName0Code84=816000A4 A7C2

CheatName0Code85=816000A6 0004

CheatName0Code86=816000A8 8FC2

CheatName0Code87=816000AA 0000

CheatName0Code88=816000AC 9042

CheatName0Code89=816000AE 0000

CheatName0Code90=816000B0 1440

CheatName0Code91=816000B2 0012

CheatName0Code92=816000B4 0000

CheatName0Code93=816000B6 0000

CheatName0Code94=816000B8 8FC2

CheatName0Code95=816000BA 0008

CheatName0Code96=816000BC 9443

CheatName0Code97=816000BE 0000

CheatName0Code98=816000C0 97C2

CheatName0Code99=816000C2 0004

CheatName0Code100=816000C4 0062

CheatName0Code101=816000C6 1024

CheatName0Code102=816000C8 3042

CheatName0Code103=816000CA FFFF

CheatName0Code104=816000CC 1040

CheatName0Code105=816000CE 0022

CheatName0Code106=816000D0 0000

CheatName0Code107=816000D2 0000

CheatName0Code108=816000D4 8FC3

CheatName0Code109=816000D6 0010

CheatName0Code110=816000D8 2402

CheatName0Code111=816000DA 40FF

CheatName0Code112=816000DC A462

CheatName0Code113=816000DE 0000

CheatName0Code114=816000E0 8FC2

CheatName0Code115=816000E2 0000

CheatName0Code116=816000E4 9042

CheatName0Code117=816000E6 0000

CheatName0Code118=816000E8 2442

CheatName0Code119=816000EA 0001

CheatName0Code120=816000EC 3043

CheatName0Code121=816000EE 00FF

CheatName0Code122=816000F0 8FC2

CheatName0Code123=816000F2 0000

CheatName0Code124=816000F4 0818

CheatName0Code125=816000F6 0056

CheatName0Code126=816000F8 A043

CheatName0Code127=816000FA 0000

CheatName0Code128=816000FC 8FC2

CheatName0Code129=816000FE 0000

CheatName0Code130=81600100 9043

CheatName0Code131=81600102 0000

CheatName0Code132=81600104 2402

CheatName0Code133=81600106 0015

CheatName0Code134=81600108 1462

CheatName0Code135=8160010A 0004

CheatName0Code136=8160010C 0000

CheatName0Code137=8160010E 0000

CheatName0Code138=81600110 8FC2

CheatName0Code139=81600112 0000

CheatName0Code140=81600114 0818

CheatName0Code141=81600116 0056

CheatName0Code142=81600118 A040

CheatName0Code143=8160011A 0000

CheatName0Code144=8160011C 8FC2

CheatName0Code145=8160011E 0000

CheatName0Code146=81600120 9042

CheatName0Code147=81600122 0000

CheatName0Code148=81600124 1040

CheatName0Code149=81600126 000C

CheatName0Code150=81600128 0000

CheatName0Code151=8160012A 0000

CheatName0Code152=8160012C 8FC2

CheatName0Code153=8160012E 0000

CheatName0Code154=81600130 9042

CheatName0Code155=81600132 0000

CheatName0Code156=81600134 2C42

CheatName0Code157=81600136 0015

CheatName0Code158=81600138 1040

CheatName0Code159=8160013A 0007

CheatName0Code160=8160013C 0000

CheatName0Code161=8160013E 0000

CheatName0Code162=81600140 8FC2

CheatName0Code163=81600142 0000

CheatName0Code164=81600144 9042

CheatName0Code165=81600146 0000

CheatName0Code166=81600148 2442

CheatName0Code167=8160014A 0001

CheatName0Code168=8160014C 3043

CheatName0Code169=8160014E 00FF

CheatName0Code170=81600150 8FC2

CheatName0Code171=81600152 0000

CheatName0Code172=81600154 A043

CheatName0Code173=81600156 0000

CheatName0Code174=81600158 03C0

CheatName0Code175=8160015A E821

CheatName0Code176=8160015C 8FBE

CheatName0Code177=8160015E 001C

CheatName0Code178=81600160 03E0

CheatName0Code179=81600162 0008

CheatName0Code180=81600164 27BD

CheatName0Code181=81600166 0020

CheatName0Code182=81600168 AAAA

CheatName0Code183=8160016A AAAA

CheatName0Code184=8160016C AAAA

CheatName0Code185=8160016E AAAA

CheatName0Count=186

Normal GS Code (not sure if it works with PJ64):

811064B0 0818

811064B2 0000

81600000 27BD

81600002 FFE0

81600004 AFBE

81600006 001C

81600008 03A0

8160000A F021

8160000C 3C1C

8160000E 8060

81600010 279C

81600012 0170

81600014 3C02

81600016 8022

81600018 3442

8160001A 4610

8160001C AFC2

8160001E 0010

81600020 3C02

81600022 8015

81600024 3442

81600026 E6C9

81600028 AFC2

8160002A 000C

8160002C 3C02

8160002E 8016

81600030 3442

81600032 6AF0

81600034 AFC2

81600036 0008

81600038 3C02

8160003A 8060

8160003C 3442

8160003E 0180

81600040 AFC2

81600042 0000

81600044 8FC2

81600046 000C

81600048 9043

8160004A 0000

8160004C 2402

8160004E 000F

81600050 1462

81600052 0004

81600054 0000

81600056 0000

81600058 2402

8160005A 0200

8160005C 0818

8160005E 002A

81600060 A7C2

81600062 0004

81600064 8FC2

81600066 000C

81600068 2442

8160006A 0001

8160006C 9043

8160006E 0000

81600070 2402

81600072 000F

81600074 1462

81600076 0004

81600078 0000

8160007A 0000

8160007C 2402

8160007E 0400

81600080 0818

81600082 002A

81600084 A7C2

81600086 0004

81600088 8FC2

8160008A 000C

8160008C 2442

8160008E 0002

81600090 9043

81600092 0000

81600094 2402

81600096 000F

81600098 1462

8160009A 002F

8160009C 0000

8160009E 0000

816000A0 2402

816000A2 0100

816000A4 A7C2

816000A6 0004

816000A8 8FC2

816000AA 0000

816000AC 9042

816000AE 0000

816000B0 1440

816000B2 0012

816000B4 0000

816000B6 0000

816000B8 8FC2

816000BA 0008

816000BC 9443

816000BE 0000

816000C0 97C2

816000C2 0004

816000C4 0062

816000C6 1024

816000C8 3042

816000CA FFFF

816000CC 1040

816000CE 0022

816000D0 0000

816000D2 0000

816000D4 8FC3

816000D6 0010

816000D8 2402

816000DA 40FF

816000DC A462

816000DE 0000

816000E0 8FC2

816000E2 0000

816000E4 9042

816000E6 0000

816000E8 2442

816000EA 0001

816000EC 3043

816000EE 00FF

816000F0 8FC2

816000F2 0000

816000F4 0818

816000F6 0056

816000F8 A043

816000FA 0000

816000FC 8FC2

816000FE 0000

81600100 9043

81600102 0000

81600104 2402

81600106 0015

81600108 1462

8160010A 0004

8160010C 0000

8160010E 0000

81600110 8FC2

81600112 0000

81600114 0818

81600116 0056

81600118 A040

8160011A 0000

8160011C 8FC2

8160011E 0000

81600120 9042

81600122 0000

81600124 1040

81600126 000C

81600128 0000

8160012A 0000

8160012C 8FC2

8160012E 0000

81600130 9042

81600132 0000

81600134 2C42

81600136 0015

81600138 1040

8160013A 0007

8160013C 0000

8160013E 0000

81600140 8FC2

81600142 0000

81600144 9042

81600146 0000

81600148 2442

8160014A 0001

8160014C 3043

8160014E 00FF

81600150 8FC2

81600152 0000

81600154 A043

81600156 0000

81600158 03C0

8160015A E821

8160015C 8FBE

8160015E 001C

81600160 03E0

81600162 0008

81600164 27BD

81600166 0020

81600168 AAAA

8160016A AAAA

8160016C AAAA

8160016E AAAA

To use... Equip the Lens of Truth to any C-button. Now just press the D-pad equivalent to whichever C-button the Lens of Truth is equipped to. Wallah, jump whenever you want.

Also, for Nemu users. If the code doesn't work for you right away, do this:

Originally posted by ZZT32
After getting the code into the Cheats.ini of Nemu - whichever way you choose to do it - boot up Ocarina of Time Debug and get to anywhere in the game where you have control of Link. Then, activate Link and set a PC breakpoint on 0x80600000. The reason we're doing this is just so that Nemu's dynarec can recognize the code change.

~~Now for a few questions...~~
^^ Answered already

*Who here knows how to provide arguments to functions in MIPS assembly? I understand that registers $a0 - $a3 are for function arguments but what about functions that require more than 4 arguments?
*I understand that to make a function call requires a JAL... Doing that will mess up the return address, which is vital to the hack. Is there a way to save the return address for later use? Perhaps the stack pointer ($sp)? Unfortunately, I don't know how to use a stack pointer.

The above questions are concerning a hook I wish to create which would help with patching. Of course, it would be easy to create the hook in C but I wish to get some more practice with assembly and possibly gain some more knowledge, too.

~~I won't be releasing the hack source until I can provide a patch.~~
^^ See bottom of post.

Thanks goes out to spinout for dealing with all of my questions and helping me to understand the basic concepts of creating a hack in C and what it needs to work properly. I also thank messian for helping me correctly compile some of my first hacks.

Also, credit goes to ZZT32 for coming up with original "Rolling Is Replaced With Jumping" GS code:



D1224780 3FA0

81224610 40FF

UPDATE: Patch and Hack Source released--

Originally posted by Casis777

NOTE: Patch does not work with PJ64! I suspect the way the hook is set up is the problem.

http://www.mediafire.com/?tlxeymccea6rr57

All information about the hack can be find within the download. There is one bug with the hack so if anyone can solve it that would be awesome. Also, there were a few errors with the GS code so I editted that, too... Enjoy

Sails
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Posted on 05-01-12 02:07:25 AM

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If further optimized to be a part of ROM modification instead of RAM, this could potentially open up a lot of interest in Zelda hacking, considering that level editing is starting to be come viable and I'm sure plenty of people will want to make a 3D Zelda where you can command yourself to jump.

Good stuff!

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Posted on 05-01-12 05:27:17 AM

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Post #4718 · 05-01-12 12:27:17 AM

Hm, I'm curious why you took the approach to extend lens of truth rather than to point one of the unused item slots at your custom function?

As for arguments, they're pushed to the stack. Though I've never really dealt with that much myself. From what I've seen, for some odd reason it pushes them at offset 0x10 and up, so:
arg0 = $A0 ... arg3 = $A3, but then arg4 = SP+0x10, arg5 = SP+0x14, etc. No idea what they do with SP+0 ... SP+0xF.

Really cool idea, btw. This fits well with a hack someone (maybe me?

) made before to boost Link's running speed when wearing the bunny hood. Perhaps you could add this function to one of the masks too. Making them more useful would be pretty neat. Though being able to equip both at the same time would be even more fun...

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Casis777
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Posted on 05-01-12 08:40:33 PM

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Originally posted by Sails
If further optimized to be a part of ROM modification instead of RAM, this could potentially open up a lot of interest in Zelda hacking, considering that level editing is starting to be come viable and I'm sure plenty of people will want to make a 3D Zelda where you can command yourself to jump.

Good stuff!

Yeah, Zelda 64 hacking (mostly Ocarina of Time) has been going on for quite awhile now... I've only recently gotten into the more advanced aspects/concepts of hacking though; this is my first notable hack made in C. At the moment, I'm in the middle of studying and programming custom actors (items, enemies, NPCs, objects).

Also, there is a patch for this hack at the bottom of the opening post.

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Jul - General Game/ROM Hacking - OoT Debug ~ Roc's Feather

Rusted Logic

28 database queries, 1 query cache hits.

Query execution time:	0.080527 seconds
Script execution time:	0.018156 seconds
Total render time:	0.098683 seconds