Print Page - Change Stage on the Fly 2

Title: Change Stage on the Fly 2
Post by: toonlink444 on February 22, 2011, 10:52:47 PM

I have found (I hope) the address that loads the stage.
Here's everything I have did to see how to use this address. I did a Read/Write breakpoint when the stage was loading and I got
Address: 815E25DB
Registers
[spoiler]CR:48000028 XER:20000000 CTR:80080A7C DSIS:02400000
DAR:815E25DB SRR0:80004354 SRR1:0000B032 LR:80080AB4
r0:00000000 r1:805B4220 r2:805A9320 r3:815E0E50
r4:9169C2FB r5:00004035 r6:815E25DA r7:00000000
r8:81600808 r9:00000010 r10:815E6660 r11:805B41B0
r12:80080A7C r13:805A4420 r14:916930E0 r15:815EDC80
r16:00000000 r17:00000000 r18:00000000 r19:00000000
r20:00000001 r21:804548A0 r22:80000000 r23:0000000A
r24:00000000 r25:815FEED0 r26:000057C0 r27:815FFEF0
r28:815FECB0 r29:00000002 r30:815FEED0 r31:000057C0
[/spoiler]
Disassembler Tab
[spoiler]80004338: 7C041840   cmplw   r4,r3
8000433C: 41800028   blt-   0x80004364
80004340: 3884FFFF   subi   r4,r4,1
80004344: 38C3FFFF   subi   r6,r3,1
80004348: 38A50001   addi   r5,r5,1
8000434C: 4800000C   b   0x80004358
80004350: 8C040001   lbzu   r0,1(r4)
80004354: 9C060001   stbu   r0,1(r6)
80004358: 34A5FFFF   subic.   r5,r5,1
8000435C: 4082FFF4   bne+   0x80004350
80004360: 4E800020   blr
[/spoiler]
It broke on: 80004354: 9C060001   stbu   r0,1(r6)
How would I use this info to make it load a stage so I can exit a stage and load one instantly

Title: Re: Change Stage on the Fly 2
Post by: Deathwolf on February 22, 2011, 11:08:31 PM

look at your instruction: 80004354: 9C060001 stbu r0,1(r6)

r0 have the value 00000000 (Stage value)
r6 [815E25DA] is the address, which is getting the value from r0.
1 = for going 1 byte forward. 815E25DA + 1 = 815E25DB

so your code would be:

stwu r1,-80(r1) # make space for 18 registers
stmw r14,8(r1) # push r14-r31 onto the stack
li r14,0xXX # write your value to r14
stbu r14,1(r6) # store value from r14 into r6
lmw r14,8(r1) # pop r14-r31 off the stack
addi r1,r1,80 # release the space

Code:

C2004354 00000004
9421FFB0 BDC10008
39C000XX 9DC60001
B9C10008 38210050
60000000 00000000

Title: Re: Change Stage on the Fly 2
Post by: toonlink444 on February 22, 2011, 11:16:27 PM

Do you mind explaining it just a little bit more like why you add registers and stuff like that. I'm still learning and hoping to learn power pc to better understand ASM.

Title: Re: Change Stage on the Fly 2
Post by: wiiztec on February 24, 2011, 04:57:20 AM

What game is this for?

Title: Re: Change Stage on the Fly 2
Post by: toonlink444 on February 24, 2011, 12:58:01 PM

SSBB

WiiRd forum

Wii & Gamecube Hacking => Wii Game hacking help => Topic started by: toonlink444 on February 22, 2011, 10:52:47 PM