(adsbygoogle = window.adsbygoogle || []).push({}); In this tutorial i will show you how Read and Write in the memory.

It's the same as 'PS3.GetMemory' and 'PS3.SetMemory' but it works a bit differently.


Reading memory

We can read memory with 4 instructions.

    

lbz  (1 byte)

lhz  (2 bytes)

lwz  (4 bytes)

ld   (8 bytes)

we use them like this:

    

lwz RESULT, ADDRESS, TEMP_VAL



Result = register containing the byte at the address

ADDRESS = register containing the address to read from

TEMP_VAL= we can use it as a temporary 'addic'

example:

    

lis r3, 0xff           r3 = 00 ff 00 00   (0xff0000) 

addic r3, r3, 0x1234    r3 = 00 ff 12 34  (0xff1234)

lwz r4, r3, 0            r4 = the first 4 bytes at 0xff1234

OR

    

lis r3, 0xff

lwz r4, r3, 0x1234       <- we use it as a temporary addic to save a line !!! but WARNING: on the next line r3 will be restored to 00 ff 00 00 while 

using addic make it permanent !!!!

another example

reading the first 4 bytes at: 0x110d60c

    

lis r3, 0x0110

lwz r4, r3, 0xd60c

OR

    

lis r3, 0x0110

addic r3,r3, 0xd60c

lwz r4, r3, 0

Writing in the memory is as easy as reading it.

we will use:

    

stb   (1 byte)

sth   (2 bytes)

stw   (4 bytes)

std   (8 bytes)

we use them like this:

    

stw VALUE, ADDRESS, TEMP_VAL

example, i want to write 0x15 at: 0x2100000

    

lis r3, 0x210      (0x2100000) || 02 10 00 00

li r4, 0x15

stw r4, r3, 0

Another example would bwe to write 0x15 at: 0xFCA280

    

lis r3, 0xFC      (r3 = 00 FC 00 00)

li r4. 0x15

stw r4, r3, 0xA280   (0xFCA280)