differences between = and equ?

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ntos

Joined: 06 Jul 2023
Posts: 18

ntos 01 Aug 2023, 02:26

Hi,
A = 60
B equ 60

Any difference if A and B are defined like this?
Thank you.

01 Aug 2023, 02:26

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20300
Location: In your JS exploiting you and your system

revolution 01 Aug 2023, 02:28

They are very different.

equ is a textual replacement. Processed by the preprocessor.

= is a numeric variable. Processed by the assembler stage.

Code:

a equ 2*
b = a 3
display b + '0'

01 Aug 2023, 02:28

ntos

Joined: 06 Jul 2023
Posts: 18

ntos 01 Aug 2023, 02:50

I mean If we are defining syscalls for a linux app for example, = or equ are no difference, arent they?
sys_write = 1
sys_exit equ 60

01 Aug 2023, 02:50

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20300
Location: In your JS exploiting you and your system

revolution 01 Aug 2023, 02:53

You can't forward reference equ

Code:

mov eax,sys_exit  ; <-- error: undefined symbol 'sys_exit'.
sys_exit equ 60

01 Aug 2023, 02:53

ntos

Joined: 06 Jul 2023
Posts: 18

ntos 01 Aug 2023, 04:05

Thank you. It is clear now.

01 Aug 2023, 04:05

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