org ($ and 0x00000FFF)

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ouadji

Joined: 24 Dec 2008
Posts: 1081
Location: Belgium

ouadji 07 May 2011, 20:01

Code:

.....
old = $
org ($ and 0x00000FFF) ;<--- does not compile, invalid expression 

;org ($  + 0x00000FFF) ;<--- but this does compile !   

;my_code

org old+($-$$)
.....

This does not compile, it's a pity, really! Crying or Very sad

_________________
I am not young enough to know everything (Oscar Wilde)-

Last edited by ouadji on 07 May 2011, 20:12; edited 1 time in total

07 May 2011, 20:01

MHajduk

Joined: 30 Mar 2006
Posts: 6094
Location: Poland

MHajduk 07 May 2011, 20:04

ouadji wrote:

Code:

.....
old = $
org ($ and 0x00000FFF) ;<------ invalid expression  

;my_code

org old+($-$$)
.....

This does not compile, it's a pity, really! Crying or Very sad

Strange, because I have no problems with compilation of your code. Rolling Eyes

07 May 2011, 20:04

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 07 May 2011, 20:45

Maybe you are using a relocatable format or added fixups in a PE?

07 May 2011, 20:45

ouadji

Joined: 24 Dec 2008
Posts: 1081
Location: Belgium

ouadji 07 May 2011, 21:08

Code:


format MS COFF ;<========================

;with "MS COFF" does not compile
;without "MS COFF" does compile.

.....
old = $
org ($ and 0x00000FFF) ;<--- does not compile, invalid expression 

;org ($  + 0x00000FFF) ;<--- but this does compile !   

;my_code

org old+($-$$)
.....

But this does compile ... it's amazing !

Code:

format MS COFF
...
old = $
org ($ + 0x00000FFF) ; doesn't work with "and", but ok with "+"
...
org old+($-$$)
...

_________________
I am not young enough to know everything (Oscar Wilde)-

07 May 2011, 21:08

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 07 May 2011, 21:49

ouadji, adding a constant is supported because that is something that can be relocated, however, applying bit operation isn't as the loader/linker can only relocate by adding a new base, and not also remembering you wanted an AND operation to be performed over the "$" address.

Still, in your particular example if you specified a section with 4096 bytes alignment that would be something that could be relocated, but fasm can't realize this.

07 May 2011, 21:49

ouadji

Joined: 24 Dec 2008
Posts: 1081
Location: Belgium

ouadji 07 May 2011, 22:07

Quote:

adding a constant is supported ... however, applying bit operation ...

ok, understood, tks you Loco.

Quote:

Still, in your particular example if you specified a section with 4096 bytes alignment that would be something that could be relocated, but fasm can't realize this.

Indeed, it is!

Code:

format MS COFF

align 0x1000 ;<-----

;code

old = $
org ($ and 0x00000FFF) 

;code

org old+($-$$)

;code

(thank you all for your help)

_________________
I am not young enough to know everything (Oscar Wilde)-

07 May 2011, 22:07

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