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How to multiply / divide register?

 
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Razi
Expert Cheater
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Joined: 17 Jan 2018
Posts: 205
PostPosted: Fri Nov 29, 2019 11:01 pm    Post subject: How to multiply / divide register? Reply with quote
How to multiply / divide ecx register by 0, 3, 4, 6, 8 and not overwrite next instruction in the following code?
Code:
some.exe+1DF29F - 8B 4D EC              - mov ecx,[ebp-14]
some.exe+1DF2A2 - D1 E1                 - shl ecx,1
some.exe+1DF2A4 - 89 4D EC              - mov [ebp-14],ecx


some.exe+1DF2BC - 8B 4D EC              - mov ecx,[ebp-14]
some.exe+1DF2BF - D1 F9                 - sar ecx,1
some.exe+1DF2C1 - 89 4D EC              - mov [ebp-14],ecx


Need to multiply / divide ecx by 0, 3, 4, 6, 8 instead of multiplying / dividing by 2 in the lines:
Code:
shl ecx,1   - multiply by 2, once
sar ecx,1   - signed divide by 2, once
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Dark Byte
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PostPosted: Sat Nov 30, 2019 4:17 am    Post subject: Reply with quote
you can't do 3 or 6 as you will always have to overwrite as you need to use div/mul which needs some registers setup
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