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Assembly subtraction not coming out to what I'd expect

 
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Phenax
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PostPosted: Sun Dec 23, 2012 10:35 am    Post subject: Assembly subtraction not coming out to what I'd expect Reply with quote
Basically, EBP is 0x80. I subtract 0x80 from that, expecting a result of 0, and I get 0x100. This is the result of 0x80+0x80, not 0x80-0x80.

What am I doing wrong here or misunderstanding?

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Dark Byte
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PostPosted: Sun Dec 23, 2012 11:14 am    Post subject: Reply with quote
do an sub ebp,00000080 instead of just 80.
sub ebp,80 is the sign extended version , meaning "sub ebp,-128"
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Phenax
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Joined: 29 Mar 2009
Posts: 16
PostPosted: Sun Dec 23, 2012 11:30 am    Post subject: Reply with quote
Dark Byte wrote:
do an sub ebp,00000080 instead of just 80.
sub ebp,80 is the sign extended version , meaning "sub ebp,-128"


Ahhh, makes perfect sense. Didn't know that was the default behavior. Much appreciated, Dark Byte.
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