* Translating nasm boot strap to as
@ 2011-03-19 14:48 Daniel Hilst Selli
2011-03-19 23:31 ` Brian Raiter
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Daniel Hilst Selli @ 2011-03-19 14:48 UTC (permalink / raw)
To: linux-assembly
I got some little code in intel syntax(nasm) and want to translate it to
AT&T syntax to assembly it with as.
The code is a bootstrap and can be found here: http://ideone.com/Qldvx
I got problem to translate 2 things ..
this:
jmp 07C0h:start
I try this
jmp 0x7C0, start
but got "Too memory operands error"
I also try all order combinations plus $ prefix combinations
and to fill the file:
times510-($-$$) db 0
I didn't find any $$ translation in as
--
"Do or do not... there is no try" Yoda Master
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Translating nasm boot strap to as
2011-03-19 14:48 Translating nasm boot strap to as Daniel Hilst Selli
@ 2011-03-19 23:31 ` Brian Raiter
2011-03-19 23:43 ` Brian Raiter
2011-03-20 0:42 ` Frank Kotler
2 siblings, 0 replies; 6+ messages in thread
From: Brian Raiter @ 2011-03-19 23:31 UTC (permalink / raw)
To: Daniel Hilst Selli; +Cc: linux-assembly
> this:
>
> jmp 07C0h:start
>
> I try this
>
> jmp 0x7C0, start
I think what you need is:
jmp $0x07C0, $start
Assuming that 0x07C0 is the segment and start is the offset.
If that doesn't work, you may need to use ljmp instead of jmp (it's
been a long time since I've thought about 16-bit assembly.)
> and to fill the file:
>
> times 510-($-$$) db 0
>
> I didn't find any $$ translation in as
$$ just refers to the start of the current section, so I think the
solution there is just to declare your own symbol at the top of the
section, and use that in place of $$.
b
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Translating nasm boot strap to as
2011-03-19 14:48 Translating nasm boot strap to as Daniel Hilst Selli
2011-03-19 23:31 ` Brian Raiter
@ 2011-03-19 23:43 ` Brian Raiter
2011-03-20 0:42 ` Frank Kotler
2 siblings, 0 replies; 6+ messages in thread
From: Brian Raiter @ 2011-03-19 23:43 UTC (permalink / raw)
To: Daniel Hilst Selli; +Cc: linux-assembly
> and to fill the file:
>
> times510-($-$$) db 0
>
> I didn't find any $$ translation in as
Actually, in this particular case, a more straightforward solution is
to just assign . a new value, like this:
. = .data + 510
(assuming that this appears in your .data section)
b
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Translating nasm boot strap to as
2011-03-19 14:48 Translating nasm boot strap to as Daniel Hilst Selli
2011-03-19 23:31 ` Brian Raiter
2011-03-19 23:43 ` Brian Raiter
@ 2011-03-20 0:42 ` Frank Kotler
2011-03-20 1:08 ` Brian Raiter
2 siblings, 1 reply; 6+ messages in thread
From: Frank Kotler @ 2011-03-20 0:42 UTC (permalink / raw)
To: Daniel Hilst Selli; +Cc: linux-assembly
Daniel Hilst Selli wrote:
> times510-($-$$) db 0
.org 510
Seems to do the trick?
Best,
Frank
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Translating nasm boot strap to as
2011-03-20 0:42 ` Frank Kotler
@ 2011-03-20 1:08 ` Brian Raiter
2011-03-21 2:28 ` Daniel Hilst Selli
0 siblings, 1 reply; 6+ messages in thread
From: Brian Raiter @ 2011-03-20 1:08 UTC (permalink / raw)
To: Frank Kotler; +Cc: Daniel Hilst Selli, linux-assembly
>> times510-($-$$) db 0
>
> .org 510
Even better!
b
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Translating nasm boot strap to as
2011-03-20 1:08 ` Brian Raiter
@ 2011-03-21 2:28 ` Daniel Hilst Selli
0 siblings, 0 replies; 6+ messages in thread
From: Daniel Hilst Selli @ 2011-03-21 2:28 UTC (permalink / raw)
To: Brian Raiter; +Cc: Frank Kotler, linux-assembly
Thanks for all, now it works!
On 03/19/11 22:08, Brian Raiter wrote:
>>> times510-($-$$) db 0
>> .org 510
> Even better!
>
> b
--
"Do or do not... there is no try" Yoda Master
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-03-21 2:28 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2011-03-19 14:48 Translating nasm boot strap to as Daniel Hilst Selli
2011-03-19 23:31 ` Brian Raiter
2011-03-19 23:43 ` Brian Raiter
2011-03-20 0:42 ` Frank Kotler
2011-03-20 1:08 ` Brian Raiter
2011-03-21 2:28 ` Daniel Hilst Selli
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