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Index > Macroinstructions > Macro Syntax or Rookie ASM mistake?

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SiGiS



Joined: 11 Feb 2013
Posts: 2
SiGiS
I am fairly new to ASM but pretty much a veteran at higher level languages, so feel free to point out stupid mistakes or suggest better solutions/alternatives...

Am I making a mistake in the Macro Syntax or is it a rookie ASM mistake?

Code:
macro Get bse, [arg]
{
  common
    mov rax, [bse]

  forward
    mov rax, [rax + arg]
}
    


This results in "error: Invalid Expression" (specifically, the line "mov rax, [rax + arg]")

What I am trying to achieve, is to have a macro that loads a method pointer from pointer table struc's.

i.e. as a silly example...

if I want to call System.SubSystem2.Group1.MethodCall1, as I understand it, I can do the following:

Code:
mov rax, [System]
mov rax, [rax + System.SubSystem2]
mov rax, [rax + SubSystem2.Group1]
mov rax, [rax + Group1.MethodCall1]

call [rax]

struc System
{
  SubSystem1 qword
  SubSystem2 qword
  SybSystem3 qword
}

struc SubSystem1
{
  MethodCall1
}

struc SubSystem2
{
  Group1
}

struc Group1
{
  MethodCall1
}
    
[/b][/code]

_________________
~ Anything is possible, given enough time ~
Post 11 Feb 2013, 18:33
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JohnFound



Joined: 16 Jun 2003
Posts: 3500
Location: Bulgaria
JohnFound
Prefix the local labels with "." (dot):
Code:
struc System
{
  .SubSystem1 dq ?
  .SubSystem2 dq ?
  .SybSystem3 dq ?
}     
Post 11 Feb 2013, 19:16
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SiGiS



Joined: 11 Feb 2013
Posts: 2
SiGiS
Thanks for reminding me about the local labels Smile

I also realised I was missing a macro define ... and the use of it after each struc

Code:
  macro struct name
  {
    virtual at 0
    name name
    end virtual
  }

  struc System
  {
    .SubSystem1 dq ?
    .SubSystem2 dq ?
    .SubSystem3 dq ?
  }
  struct System
    
Post 11 Feb 2013, 20:36
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