Help/Support Adding new instruction in IDA

[Aradmey 26 iPhone 6 10.2]

I'm trying to add a new instruction in IDA using the HEX editor, but instead of adding a new one, it edits an instruction..

I mean for example, instead of this code:

AA AA AA AA  BB BB BB BB

Turn it into this, without damaging the hex after BB..

AA AA AA AA  CC CC CC CC
BB BB BB BB  DD DD DD DD

 

Updated July 2, 2017 by Aradmey

[Rook 559.8k iPad Pro (2nd gen) 17.4 Donor]

To my knowledge, you cannot add instructions to a function unless you code cave.

You can edit, however. And editing is what most cheaters do.

[Aradmey 26 iPhone 6 10.2]

4 minutes ago, DiDA said:

To my knowledge, you cannot add instructions to a function unless you code cave.

You can edit, however. And editing is what most cheaters do.

Alright, so I'm trying to decide how to edit it correctly. I have two lines and didn't find any tutorial that explains what they do exactly so I can't edit it..

ADRP X1, #aCurrentammo@PAGE
	ADD X1, X1, #aCurrentsmmo@PAGEOFF

[Zahir 395k iPad Mini 4 13.6]

27 minutes ago, Aradmey said:

Alright, so I'm trying to decide how to edit it correctly. I have two lines and didn't find any tutorial that explains what they do exactly so I can't edit it..

 

ADRP X1, #aCurrentammo@PAGE
	ADD X1, X1, #aCurrentsmmo@PAGEOFF

 

seems useless to me

[Aradmey 26 iPhone 6 10.2]

1 minute ago, ZahirSher said:

seems useless to me

Why useless? Cant it be the variable that stores the ammo on hand?

[Zahir 395k iPad Mini 4 13.6]

4 minutes ago, Aradmey said:

Why useless? Cant it be the variable that stores the ammo on hand?

Its a string, not all games' string are useful. It might be useful but you hv to try and test it around the function

[Aradmey 26 iPhone 6 10.2]

Just now, ZahirSher said:

Its a string, not all games' string are useful. It might be useful but you hv to try and test it around the function

How do I recognize if something is string, int or whatever? Tutorials didn't explain that at all..