Is there a way to find out what instructions write to an address?

[ThePerplexedOne]

I'm trying to write my own cheat codes to get some practice in. It's easy enough finding pointers for certain addresses and creating codes for those.

Currently I am using Edizon and Noexes, and PointerSearcherSE

But so far I can't figure out how to find specific instructions inside functions. E.g. instead of finding the address of health and changing the value, I want to be able to find the address of health, then find out what instructions are writing to it, and then modify those instructions. This is easy enough in PC hacking, because Cheat Engine is such a powerful tool with features like that.

So far, I cannot find any strings using IDA that are helpful to me.

 

[FAST6191]

I have been following some of the Atmosphere GDB bridges/stubs/whatever for cheat making for the Switch. Several of those appear to support breakpoints (break on write being one of those). Specifics of that I am less familiar with though. IDA tended to be the weapon of choice, but will tend to also want to be the full fat version rather than the older free X86 one. https://gbatemp.net/threads/atmospheres-gdb.602435/
Whether you can twist something like https://wrongbaud.github.io/posts/ghidra-debugger/ , GNU/GCC or possibly Radare2 to work for it I don't know.

You also have the option of trying disassembly, however I am not sure how that would shake out with the Switch's use of ASLR and more dynamic allocation of memory even without that compared to older devices where even ctrl F in a text editor would do for you in a considerable amount of cases.