CODEWITHSUNDEEP
gccassemblymingwx86-64nasm
Omer
Omer

Reputation: 77

Linking error for 64-bit NASM code with MinGW 32

I wrote this code:

    global  _main
    extern  _printf

    section .text
_main:
    push    message
    call    _printf
    add     esp, 4
    ret
message:
    db  'Hello, World', 10, 0

and tried to run it from cmd. It looks like that:

C:\Users\user\AppData\Local\bin\NASM>nasm helloworld.asm -f win64 -o helloworld.obj

C:\Users\user\AppData\Local\bin\NASM>gcc helloworld.obj -m64 -o helloworld.exe
helloworld.obj: file not recognized: File format not recognized
collect2: ld returned 1 exit status

I searched this error in google but nothing was relevant for me. I'm using Windows (10) as you can see. Does someone know how to solve this problem? Thanks.

When I run gcc -v I get this:

Reading specs from C:/MinGW/bin/../lib/gcc/mingw32/3.4.5/specs
Configured with: ../gcc-3.4.5-20060117-3/configure --with-gcc --with-gnu-ld --with-gnu-as --host=mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-nls --enable-languages=c,c++,f77,ada,objc,java --disable-win32-registry --disable-shared --enable-sjlj-exceptions --enable-libgcj --disable-java-awt --without-x --enable-java-gc=boehm --disable-libgcj-debug --enable-interpreter --enable-hash-synchronization --enable-libstdcxx-debug
Thread model: win32
gcc version 3.4.5 (mingw-vista special r3)

Upvotes: 1

Views: 1494

Answers (1)

Ray Toal
Ray Toal

Reputation: 88388

From your gcc -v output it looks like you are using mingw-32.

You need to get mingw-w64.

Also, functions in 64-bit code for Windows look completely different. Rewrite your code as follows:

; ----------------------------------------------------------------------------------------
; This is a Win64 console program that writes "Hello" on one line and then exits.  It
; uses puts from the C library.  To assemble and run:
;
;     nasm -fwin64 hello.asm && gcc hello.obj && a
; ----------------------------------------------------------------------------------------

        global  main
        extern  puts
        section .text
main:
        sub     rsp, 28h                        ; Reserve the shadow space and align stack
        mov     rcx, message                    ; First argument is address of message
        call    puts                            ; puts(message)
        add     rsp, 28h                        ; Remove shadow space
        ret
message:
        db      'Hello', 0                      ; C strings need a zero byte at the end

Discussion at the bottom of this page

Upvotes: 4

Related Questions