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[asm]Calculating Jumps

 
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dnsi0
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PostPosted: Tue Aug 12, 2008 11:17 am    Post subject: [asm]Calculating Jumps Reply with quote
Well. I am having some trouble with calculating jumps.

Heres what I know so far:
To calculate a jmp that goes later on into the memory you would use:
Like from 00401000 to 00402000.
Inverse These Bytes:
TheAddressToTheJump-(TheAddressYouAreAt+5)

Now my question is how do jump back?
Like from 00402000 to 00401000
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lurc
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Joined: 13 Nov 2006
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PostPosted: Tue Aug 12, 2008 1:59 pm    Post subject: Reply with quote
Code:
#define JmpOffset( to, from )    ( (INT)to - (INT)from - 5 )

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Cx
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Joined: 27 Jul 2007
Posts: 367
PostPosted: Thu Aug 14, 2008 11:06 pm    Post subject: Re: [asm]Calculating Jumps Reply with quote
dnsi0 wrote:
Well. I am having some trouble with calculating jumps.

Heres what I know so far:
To calculate a jmp that goes later on into the memory you would use:
Like from 00401000 to 00402000.
Inverse These Bytes:
TheAddressToTheJump-(TheAddressYouAreAt+5)

Now my question is how do jump back?
Like from 00402000 to 00401000

the same way.
you somehow have to store the address though (stack, var).
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