NASM:

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1 total messages Started by Matuzalem Mon, 16 Oct 2006 06:49

#755

Author: Matuzalem
Date: Mon, 16 Oct 2006 06:49

30 lines
1961 bytes

Witam

; ----------------------

msg db "Welcome", 0

; (...)

mov dx, msg
mov al, [byte dx] ; error: invalid effective address

; ----------------------


NASM Manual:
"However, you can force NASM to generate an effective address in a
particular form by the use of the keywords BYTE, WORD, DWORD and
NOSPLIT. If you need [eax+3] to be assembled using a double-word offset
field instead of the one byte NASM will normally generate, you can code
[dword eax+3]. Similarly, you can force NASM to use a byte offset for a
small value which it hasn't seen on the first pass (see section 3.8 for
an example of such a code fragment) by using [byte eax+offset]. As
special cases, [byte eax] will code [eax+0] with a byte offset of zero,
and [dword eax] will code it with a double-word offset of zero. The
normal form, [eax], will be coded with no offset field."

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