I just started learning ASM, I have C experience but I guess it doesn't matter. Anyway how can I initialize a 12 elements array of DT to 0s, and how not to initialize it?
I use FASM.
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2The language is called "assembly" and the piece of system software that turns it into an executable is called an "assembler".Sparafusile– Sparafusile2011-07-26 18:25:20 +00:00Commented Jul 26, 2011 at 18:25
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2 Answers
Since arrays are just a contiguous chunk of memory with elements one after the other, you can do something like this in NASM (not sure if FASM supports the times directive, but you could try):
my_array:
times 12 dt 0.0
That is expanded out when your source is assembled to:
my_array:
dt 0.0
dt 0.0
dt 0.0
dt 0.0
dt 0.0
dt 0.0
dt 0.0
dt 0.0
dt 0.0
dt 0.0
dt 0.0
dt 0.0
3 Comments
adad
I tried that and I get invalid operand when I do it with times syntax.
adad
Oh, yeah it supports times directive but i don't know why I can't use it with dt variable x_x
Jens Björnhager
You can't initialize tbytes to integers, only to floats: times 12 dt 0.0
Just use the reserve data directive and reserve 12 tbytes:
array: rt 12
8 Comments
adad
well then I would have to reserve 10x12 bytes right? dt is 10 bytes.
adad
And then can I normally reffer to that bytes like that :mov eax, [array+10](second element)?
Jens Björnhager
Yes, but as you are working with tbytes perhaps you meant something like fld tbyte [array+10]?
adad
Why is that? I just started learnign some things are still blur to me.
Jens Björnhager
eax is 32 bits, you can only fit four bytes there. tbytes are mostly used for 80-bit full-precision floating-point numbers.
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