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Certain instruction breakpoint/code injection not working

 
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hayabusa-senpai
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Joined: 21 Sep 2021
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PostPosted: Tue Nov 29, 2022 3:48 pm    Post subject: Certain instruction breakpoint/code injection not working Reply with quote
Hey,

Im using the xenia emulator and there seems to be certain instructions that I can't modify.

Setting page protection to read / write / access allows me to set the breakpoint but when the instruction is triggered, nothing happens (I can see it being called in the DBVM what writes to this address) - if I attempt a code injection, my entire PC locks up.

I have other scripts for this emulator on the same game and I have no issue with setting breakpoints & injecting so im not sure what Im doing wrong.

I tried all the debugger options

crash.png
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 Filesize:  93.82 KB
 Viewed:  701 Time(s)

crash.png
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Dark Byte
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PostPosted: Tue Nov 29, 2022 3:57 pm    Post subject: Reply with quote
that's kernelmode memory

in memview go to view and check kernelmode and then go to file->"use windows debug server"

at least that way you may get a better view of what you're doing (e.g it might be a useless copy function)

I don't think xenia is using kernelmode to change instructions so you may want to look at a different thing
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hayabusa-senpai
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Joined: 21 Sep 2021
Posts: 10
PostPosted: Tue Nov 29, 2022 4:37 pm    Post subject: Reply with quote
Dark Byte wrote:
that's kernelmode memory

in memview go to view and check kernelmode and then go to file->"use windows debug server"

at least that way you may get a better view of what you're doing (e.g it might be a useless copy function)

I don't think xenia is using kernelmode to change instructions so you may want to look at a different thing


Thanks! It does look to be a copy function. Basically the address in the non emulator version I found in the emulator and this is the instruction that's writing to the address that I need to modify. Would this be possible?

I enabled Read/Write Process memory and set debugger to kernel mode and selected the ability to step through kernel code but whenever I insert a breakpoint, nothing happens, and DBVM breakpoint will lock my PC completely (no blue screen, just freezes)

Thanks again!
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