Nasm x64 code for windows

Question

I searched the internet rather, an example of a NASM x64 for windows, but I found just one, and, not work :(, just found for linux, code someone could show an example of how to create a Hello world NASM x64 windows

x64 assembly code for NASM linux

x64 Assembly code for NASM windows

Answer 1

A topic talking about that : https://openclassrooms.com/forum/sujet/nasm-win64-bug-hello-world. Someone brings up a solution in NASM [Win64].

main.asm

extern GetStdHandle
extern WriteFile
extern Sleep
extern ExitProcess
 
%define STD_OUTPUT_HANDLE (-11)
 
section .data
hello_str db "Hello World", 13, 10
hello_size equ ($ - hello_str)
 
output_handle dq 0
 
section .text
 
global main
main:
    ;Aligne la pile
    and rsp, 0xFFFF_FFFF_FFFF_FFF0
    mov rbp, rsp
 
    ;Récupère l'output standart
    mov ecx, STD_OUTPUT_HANDLE
    call GetStdHandle
    mov [output_handle], rax
     
    ;Affiche le message
    ;Shadow Space
    sub rsp, 48
    mov rcx, [output_handle]
    mov rdx, hello_str
    mov r8d, hello_size
    mov r9, 0
    mov QWORD [rsp + 32], 0
    call WriteFile
    ;Détruit l'espace de pile alloué pour les paramètres de la fonction
    add rsp, 48
     
    ;Pause de 1000 millisecondes pour donner le temps de voir
    ;Shadow Space
    sub rsp, 0x20
    mov ecx, 1000
    call Sleep
     
    ;Quitte
    xor rcx, rcx
    call ExitProcess

make.bat

@echo off
 
nasm.exe -fwin64 main.asm -o Obj/main.o
gpp.exe -s -m64 Obj/main.o -o hello.exe C:\Windows\System32\kernel32.dll
 
pause

"Note that I link with g++, but I think you can adapt it to your linker."

Answer 2

I just wrote a minimal windows 64 assembly code file. I compile it with nasm and I link it with ld.exe. I am not an expert. I am learning but I have noticed a lack of a simple code file. Source asm file is:

    bits 64
default rel

MB_OK   equ 0
NULL    equ 0

extern MessageBoxA
extern ExitProcess

section .text
    push    rbp
    mov     rbp,    rsp
    
    mov     rcx,    MB_OK
    lea     rdx,    mensaje2
    lea     r8,     mensaje1
    mov     r9,     NULL
    sub     rsp,    32
    call    MessageBoxA
    
    
    xor     rcx,    rcx
    sub     rsp,    32
    call    ExitProcess

section .data
    mensaje1: db "Hola colega", 0
    mensaje2: db "Esto es una prueba", 0

I compile it with this makefile:

EXE=a.exe

ASMB=nasm.exe
LINK=ld.exe
ASMFLAGS=

LDFLAGS = -LC:\SinInstalacion\Desarrollo\mingw64\x86_64-w64-mingw32\lib -lkernel32 -luser32

OBJS=main.o

all: $(EXE)

$(EXE): $(OBJS)
    $(LINK) -o $(EXE) $(OBJS) $(LDFLAGS)
    
%.o: %.asm
    $(ASMB) -f win64 $< -o $@ $(ASMFLAGS)

clean:
    del $(OBJS) $(EXE)

I wrote this post because I have not found an example in Google.

Forgive my mistakes.

Cheers.

I needed to add debug information to the exe file to be debugged with gdb. I changed makefile to:

EXE=a.exe

ASMB=nasm.exe
LINK=ld.exe
ASMFLAGS=-g -F dwarf

LDFLAGS =-g -LC:\SinInstalacion\Desarrollo\mingw64\x86_64-w64-mingw32\lib -lkernel32 -luser32

OBJS=main.o

all: $(EXE)

$(EXE): $(OBJS)
    $(LINK) -o $(EXE) $(OBJS) $(LDFLAGS)
    
%.o: %.asm
    $(ASMB) -f elf64 $< -o $@ $(ASMFLAGS)

clean:
    del $(OBJS) $(EXE)

I hope it could be useful.