Procedures vs. Macros

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log(21

Joined: 09 Jun 2006
Posts: 6

log(21 09 Jun 2006, 22:46

I am working on writing an operating system in fasm. However, the kernal has grown quite large and I have a way to shrink it down. I have used macroinstructions for most of the system, and because of this, it has become quite bulky. I want to be able to convert them to procedures to save space, but it doesn't seem to be working the same way as other assemblers such as MASM. Could someone post some example code on how to write a procedure in FASM with arguments passed to it?

09 Jun 2006, 22:46

RedGhost

Joined: 18 May 2005
Posts: 443
Location: BC, Canada

RedGhost 11 Jun 2006, 00:41

with macros

Code:

include 'PROC32.INC'

proc name param1, param2
        mov eax, <return value>
        ret
endp

i believe fasm supports MASM style procdures now such as

Code:

name:BYTE/:DWORD etc

or you can do it manually

Code:

param1 equ ebp+8 ;delcare variable one way
name:
    label param1 DWORD at ebp+8 ;delcare variable another way
    push ebp
    mov ebp, esp

    mov [param1], <value>

    mov esp, ebp
    pop ebp

    mov eax, <return value>
    ret

_________________
redghost.ca

11 Jun 2006, 00:41

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