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AA translation of asm in 64-bit
Posted: Wed May 13, 2020 2:21 pm
by kantoboy69
I'm not sure if this is correct translation of AA into asm
AA Script
Code: Select all
mov dl, byte ptr [rdi+r8+4]
mov dh, byte ptr [rdi+r9+4]
mov byte ptr [rdi+r8+4], dh
mov byte ptr [rdi+r9+4], dl
Memory viewer
Code: Select all
FFF90489 - 42 8A 54 07 04 - mov dl,[rdi+r8+04]
FFF9048E - 42 8A 74 0F 04 - mov sil,[rdi+r9+04]
FFF90493 - 42 88 74 07 04 - mov [rdi+r8+04],sil
FFF90498 - 42 88 54 0F 04 - mov [rdi+r9+04],dl
dh is translated as sil
but the problem is, it modified rsi value
Re: AA translation of asm in 64-bit
Posted: Thu May 14, 2020 12:00 am
by SunBeam
I was going to say it might be a bug, but then again it's just you trying your own way of writing code that doesn't exist:
And to respond: CE just falls back to an instruction that can be assembled, that's why:
Future suggestion: try your to-be-assembled instruction in other tools too? Thanks.
BR,
Sun
Re: AA translation of asm in 64-bit
Posted: Fri May 15, 2020 2:32 am
by kantoboy69
SunBeam wrote: ↑Thu May 14, 2020 12:00 am
I was going to say it might be a bug, but then again it's just you trying your own way of writing code that doesn't exist:
And to respond: CE just falls back to an instruction that can be assembled, that's why:
Future suggestion: try your to-be-assembled instruction in other tools too? Thanks.
BR,
Sun
Thanks SunBeam.
That makes sense, considering it's 64-bit.
I should have done this instead
mov dl, byte ptr [rdi+r8+4]
xchg byte ptr [rdi+r9+4], dl
xchg byte ptr [rdi+r8+4], dl
I forgot xchg instruction exists