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Need help with a CMP

 
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GabbeHags
How do I cheat?
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Joined: 12 Jul 2020
Posts: 3
PostPosted: Thu Jul 16, 2020 6:12 pm    Post subject: Need help with a CMP Reply with quote
I'm pretty new to assembly so this may be very obvious but I don't understand what a CMP does without a JMP of some kind

Code:

sub rsp,20
cmp [rcx+54],edx //<----- I don't understand the meaning of this CMP
mov rdi,r8
mov esi,[rcx+00000088]
mov rbx,rcx
cmovb edx,[rcx+54]
cmp edx,esi
je ShadowOfWar.exe+EE9E31
mov [rcx+00000088],edx
mov rdx,r8


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ParkourPenguin
I post too much
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Joined: 06 Jul 2014
Posts: 4731
PostPosted: Thu Jul 16, 2020 6:25 pm    Post subject: Reply with quote
cmp sets the rflags register, mov instructions don't access rflags, cmovb reads rflags to see if it should move a value.
e.g. "if [rcx+54] is below edx, move [rcx+54] into edx"; it's effectively a constraint on the maximum value of edx.
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GabbeHags
How do I cheat?
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Joined: 12 Jul 2020
Posts: 3
PostPosted: Thu Jul 16, 2020 6:38 pm    Post subject: Reply with quote
Thank you for helping me solve my problem.
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