Label problem.

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j-coder

Joined: 03 Jul 2008
Posts: 2

j-coder 04 Jul 2008, 00:14

Hey,

I'm new in a forum, but i have programmed about 5 years with C++ and 2 years with a NASM. My frend told me about a FASM and i tried and loved it! Now i have one question.

Can someone tell to me is it possible to reuse same lable?

I mean something like this:

Code:

      mov ECX, 10

   _loop:
      dec ECX
      cmp ECX, 0
      ja loop

      release _loop

      mov ECX, 10

   _loop:
      dec ECX
      cmp ECX, 0
      ja _loop

I hope you answer quickly.

PS. Sorry my bad english.

04 Jul 2008, 00:14

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20432
Location: In your JS exploiting you and your system

revolution 04 Jul 2008, 01:23

You have a few problems above:

repeated label "_loop". Try either use unique label or use the anonymous "@@" and "@B" set.
What is "release"? It is not an opcode or an assembler directive. Is it a macro you have defined?

Maybe you can try this:

Code:

      mov ECX, 10

   _loop1:
      dec ECX
      cmp ECX, 0
      ja _loop1

      mov ECX, 10

   _loop2:
      dec ECX
      cmp ECX, 0
      ja _loop2

or this:

Code:

      mov ECX, 10

   @@:
      dec ECX
      cmp ECX, 0
      ja @b

      mov ECX, 10

   @@:
      dec ECX
      cmp ECX, 0
      ja @b

BTW: you don't need the cmp instructions if there is no code between dec and jcc. So you can also do this:

Code:

      mov ECX, 10

   @@:
      dec ECX
      jnz @b

      mov ECX, 10

   @@:
      dec ECX
      jnz @b

Lastly, you can use the loop to make the whole thing very neat and tidy

Code:

      mov ECX, 10
   @@:
      ;other code goes here
      loop @b

      mov ECX, 10
   @@:
      ;other code goes here
      loop @b

04 Jul 2008, 01:23

j-coder

Joined: 03 Jul 2008
Posts: 2

j-coder 04 Jul 2008, 08:25

Thanks revolution. I think that @@ was that what i meant.

04 Jul 2008, 08:25

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