KOM #1

What is the value at address 08800000 after running this subroutine

Lui t0 $880
Ori t1 0 $1337
Ori t2 0 2
Mult t1 t2
Mflo t1
Addi t2 0 $FFFF
Sub t2 t2 t1
Sw t2 0(t0)
Jr ra
Nop

Please read the sticky post in this section.

Ori t2 0 2
Sw t2 0(t0)

needs to be fixed properly to not cause confusion.....

Ori t2 0 $2
Sw t2 $0(t0)

or

Ori t2 zero $2
Sw t2 $0(t0)

and also can be this:

Ori $t2, $zero, 0x2
Sw $t2, $zero, 0x0($t0)

I believe leet know all of this just need to make it that way for noobs dawg

Emu wrote:

Ori t2 0 2
Sw t2 0(t0)

needs to be fixed properly to not cause confusion.....

Ori t2 0 $2
Sw t2 $0(t0)

or

Ori t2 zero $2
Sw t2 $0(t0)

and also can be this:

Ori $t2, $zero, 0x2
Sw $t2, $zero, 0x0($t0)

I believe leet know all of this just need to make it that way for noobs dawg

But confusing is fun Most people here use ps2dis and those will enter in ps2dis (The ones I gave) so if they really wanted to know they could check there, or this post now . (By the way next time you are on skype/aim You need to show me how to use IDA Pro or what ever it is called )

"Sub t2 t1"
Doesnt Sub need 3 arguments? (output register - first register - second register)

Fixed

Lui t0 $880 // Upper address 0x0000
Ori t1 0 $1337 // Value 1337
Ori t2 0 2 // Value 2
Mult t1 t2 // 1337 * 2 = 0A72 and store in Lo
Mflo t1 // 0A72 is stored in t1 from Lo
Addi t2 0 $FFFF // Value FFFF also -1 from the negative rule
Sub t2 t2 t1 // Sub FFFF - 0A72 = F58D
Sw t2 0(t0) // Stores 0x0000F58D to address 0x00000000
Jr ra // Jump register return address (end code)
Nop // slot delay

Nope, 1337 is a hex value ($ = 0x in ps2dis)

1337 in hex * 2 in hex = A72....

this is the only other answer I can think of with no ps2dis help just calc:

0x0000D991

Emu wrote:

1337 in hex * 2 in hex = A72....

Hmmm my calculator is weird sorry -goes to check it again-

edit: lmao I just checked and it gave me your value, checked again (same thing) gave me another)

edit two:

Still wrong but you are close, only one mistake and it might not be something you should know unless you found my accidently like me

(It is a FULL 32bit value with no zeros )

I am positive this is right:

Lui t0 $880 // Upper address 0x0000
Ori t1 0 $1337 // Value 1337
Ori t2 0 2 // Value 2
Mult t1 t2 // 1337 * 2 = 0A72 and store in Lo
Mflo t1 // 0A72 is stored in t1 from Lo
Addi t2 0 $FFFF // Value FFFF also -1 from the negative rule
Sub t2 t2 t1 // Sub FFFF - 0A72 = F58D
Sw t2 0(t0) // Stores 0xFFFFF58D to address 0x00000000
Jr ra // Jump register return address (end code)
Nop // slot delay

Yeah that is right Emu, make your KOM when ever you want