Anonymous labels not enough, need anonymous OPCODES

Index > Main > Anonymous labels not enough, need anonymous OPCODES

Goto page Previous 1, 2, 3, 4

Author

Thread

xRagDiscretePulsar

Joined: 12 Nov 2022
Posts: 3

xRagDiscretePulsar 12 Nov 2022, 22:30

r22 wrote:

Anonymous labels don't add anything to the syntax.

They don't have to add anything to the syntax. They are needed in order to simply jump through the string line, or other reserved bytes:

Code:

jmp @f
someStr db "Hello World!",0h
@@:

r22 wrote:

They promote spaghetti code

This is what assembler started with. And that's where he should stay. I am in favor of not even using labels, local labels and anonymous labels, but simply measuring relative to addresses.

I approve only:

If you don't like thinking like a processor, go for a high-level language. Don't corrupt the cybernetic paradigms.

r22 wrote:

ASM like everything else that's useful needs a STANDARD way of doing things.

"Standard way of doing things" are the business of network transmissions. Assembler is the right to assemble the bytes however you like.

r22 wrote:

but one old fool in the 1960's thought 'well I don't like typing label names lets use @ signs'

The only fool here is your kind, who do not know with what approach computers were conceptualized.

12 Nov 2022, 22:30

macomics

Joined: 26 Jan 2021
Posts: 928
Location: Russia

macomics 13 Nov 2022, 03:03

You're 15 years late with the answer!

13 Nov 2022, 03:03

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20306
Location: In your JS exploiting you and your system

revolution 13 Nov 2022, 05:43

xRagDiscretePulsar wrote:

r22 wrote:
Anonymous labels don't add anything to the syntax.

They don't have to add anything to the syntax. They are needed in order to simply jump through the string line, or other reserved bytes:
Code:
jmp @f
someStr db "Hello World!",0h
@@:    

Just to be clear, they aren't needed, there are alternative methods with named labels. You can choose to use them if you want to, but you don't need to use them if you don't want to.

13 Nov 2022, 05:43

xRagDiscretePulsar

Joined: 12 Nov 2022
Posts: 3

xRagDiscretePulsar 14 Nov 2022, 13:38

revolution wrote:

Just to be clear, they aren't needed, there are alternative methods with named labels. You can choose to use them if you want to, but you don't need to use them if you don't want to.

I wanted to say, but didn't say the most important thing in all of this, that anonymous labels allow you to reserve the names for more significant labels.

14 Nov 2022, 13:38

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20306
Location: In your JS exploiting you and your system

revolution 14 Nov 2022, 13:45

xRagDiscretePulsar wrote:

I wanted to say, but didn't say the most important thing in all of this, that anonymous labels allow you to reserve the names for more significant labels.

Label names are not limited. There really isn't any need to be frugal with them. You can use any random name without restriction.

Code:

jmp .string_skip_1
someStr db "Hello World!",0h
.string_skip_1:

14 Nov 2022, 13:45

xRagDiscretePulsar

Joined: 12 Nov 2022
Posts: 3

xRagDiscretePulsar 14 Nov 2022, 17:44

revolution wrote:

Label names are not limited. There really isn't any need to be frugal with them. You can use any random name without restriction.
Code:
jmp .string_skip_1
someStr db "Hello World!",0h
.string_skip_1:     

The problem with labels is that I would like to always call them by the same name: lpostr, lpistr, lpon, lpin, lphandle, lpostruct, lpistruct. It's just a magazine for a call.
If you name them that by increment, then after removing the previous label, it will no longer be: label1, label2, label3, but: label1, label3. And I'm lazy after that to reorder their numbers.

Here is what i use:

Code:

;...
c0 equ db 0E8h, 0, 0, 0, 0
j equ db 0EBh, 
;...
        c0              ; push the address of the instruction jmp
        j 36-5          ; the columns indexed by notepad.exe
db "C:\Windows\sysWOW64\ws2_32.dll",0h
        pop edx                              
        add edx,2       ; skip the instruction jmp
        p edx           ; address of the string
        m ebx, LoadLibraryA
        c ebx

Optimization is the second thing Very Happy

edit 02 Jun 2023:

Hello, it's me again:

Code:

        db 0E8h, 0h, 0h, 0h, 0h
        pop ebx         ; save this memory position at ebx. Instruction size = 1 byte
        db 0EBh, 08h    ; skip 8 bytes. Instruction size = 2 bytes.
        dd 61h          ; data of 4 bytes
        dd 62h          ; data of 4 bytes
                        ; after skip
        push dword ptr ds:[ebx+3]       ; 61h  
        push dword ptr ds:[ebx+3+4]     ; 62h
        call func

Last edited by xRagDiscretePulsar on 02 Jun 2023, 06:41; edited 23 times in total

14 Nov 2022, 17:44

Overclick

Joined: 11 Jul 2020
Posts: 669
Location: Ukraine

Overclick 14 Nov 2022, 19:11

No problem to do all that things by macros.
Numerated shifting for example

Code:

macro @@@ t& {
        local anonymous
        @F1=$
        @B5 equ @B4
    @B4 equ @B3
    @B3 equ @B2
    @B2 equ @B1
    @B1 equ @F1
    @F1 equ @F2
    @F2 equ @F3
    @F3 equ @F4
    @F4 equ @F5
    @F5 equ anonymous
    match =: arg,t \{ arg \} }

14 Nov 2022, 19:11

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20306
Location: In your JS exploiting you and your system

revolution 14 Nov 2022, 22:28

xRagDiscretePulsar wrote:

And I'm lazy after that to reorder their numbers.

You don't need to have the labels in any particular order. The assembler has no requirement for that.

The point was you can choose to do labelling in any way you please. But there is no need or requirement to use anonymous labels. It is purely your choice.

It also works the other way. There is no need or requirement to use named labels. You could probably write an entire program using anonymous labels. I've never tried, but I would guess it is possible. That might be a good challenge to see just how much can be done. Idea

14 Nov 2022, 22:28

DimonSoft

Joined: 03 Mar 2010
Posts: 1228
Location: Belarus

DimonSoft 21 Nov 2022, 14:32

Since anonymous labels are only first-before and first-after, the first if-then-else with both branches non-empty will be a headache and will probably require changing the instructions to accomodate.

21 Nov 2022, 14:32

Goto page Previous 1, 2, 3, 4

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum