DLL IMPORT AND EXPORT In NASM Under -Fwin32

[Dibya]

Hi guys and gals ,
How to declare dll import and export under NASM while using -fwin32 as -fobj is outdated .
I need some help . My code is perfect but i need some help regarding dll import and export .
FOr example i want to import RtlInterlockedCompareExchange64 from ntdll.dll and export MYFUNCTION1 in my own dll.
I am new here hope i will get some help .
Thanks in Advance .
As a linker I want to use either link.exe or Golink
I have used PE macro but compiled binaries are not proper enough for serious purpose ...

[dreamCoder]

I don't know what and how Rtl.... works but here's something that features both things. This will translate to a .DLL file and "myfunction1" is visible.

Code: [Select]

;nasm -f win32 prog.asm
;golink /dll prog.obj ntdll.dll
;(ignore the warning)

global myfunction1
export myfunction1

extern RtlInterlockedCompareExchange64

section .text

myfunction1:
        push    eax  ;just guessing the arguments.
        push    ebx
        push    ecx
        call    RtlInterlockedCompareExchange64
        ret

[Dibya]

Thanks My friend You became my life savvier.
 If i have to include Kernel32 and shell32 then what should i do
golink /dll prog.obj ntdll.dll,shell32.dll,kernel32.dll is it alright to do so ?

[dreamCoder]

yes, but no commas.

[Dibya]

Thanks a lot

[Dibya]

  fdivp st qword (1),st
  push    dword [esi+34h]
  push    dword [eax+18h]
nasm is not accepting this opcodes what should i do?

[Frank Kotler]

Use valid syntax?

Code: [Select]

fdivp st1, st0
Is that what you want? The rest of it looks okay to me...

Best,
Frank

[Dibya]

Thanks You are awesome

[Dibya]

I am getting Some weird result with GoLink Please help

[dreamCoder]

try adding "/mix" at the end of the GoLink script.

[Dibya]

Same issue please help . OBJ is ready but i am unable to get dll.

which version of nasm do you use ?

[dreamCoder]

@Dibya

I can't offer u much help because you're not showing any code. I am working in 'guessing mode' only. If you don't want to share the entire code, just show / test the minimum layout of your code where import / export is involved. Start small and proceed slowly to reduce mistakes.
 

[Frank Kotler]

At the risk of stating the obvious, "myfunction" is lowercase in the code shown above and uppercase in the error message... Sorry, but I'd feel like a fool if I didn't mention it...

Best,
Frank

[Dibya]

Nothing is Com pilling even simple one like this
EXPORT MYFUNCTION
GLOBAL MYFUNCTION
MYFUNCTION:
 xor eax,eax
 retn

Even i have tried code from other people who able to link properly
. Nasm Compiles with out issue but Golink fails
Even your code does not compile .
I am doing nothing just learning how to compile in NASM properly . I have been moving from MASM which became obsolete as it is not updated long .

[Dibya]

Sorry Guys Its utter foolishness of mine
i have not mentioned section
section .text

; Any way is it possible to specify dll for import in ex tern . lets take if i wish to specify to another program.dll