nasm application crash after printf

Question

Very simple Hello world with nasm. I successful assembly it with nasm.exe main.asm -f win32 -o main.obj and linking it with gcc.exe -fno-use-linker-plugin -o main.obj output.exe
It runs ok, it prints on the screen and then the program crashes (output.exe has stopped working). It seems I made some stuff on the stack but I can't find the error. Is it ok if I pass parameters on the stack (stdcall)? It should, because it prints ok but..

Here's the code

section .data
    msg db "Hello, world!", 0

section .text
    global _main
    extern _printf
_main:

    push msg
    call _printf

    xor eax, eax
    ret

Platfor: win8.1 x64, Intel CPU, NASM 2.11, GCC latest version

Jester · Accepted Answer · 2014-08-10 13:44:14Z

1

printf being a C function, it isn't stdcall, it is cdecl. As such, the caller (you) needs to free the argument after the call. Use add esp, 4.

answered Aug 10, 2014 at 13:44

Jester

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2 Comments

incud Over a year ago

Thanks :) Do I need to free the call for any cdecl calling function?

Jester Over a year ago

Yes, applies to all cdecl functions.

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