Change Stage on the Fly 2

[toonlink444]

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

[Deathwolf]

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

[toonlink444]

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.

[wiiztec]

What game is this for?

[toonlink444]

SSBB