Printing hello world in nasm windows

Asked Jan 01 '18 at 17:38

Active Jan 01 '18 at 21:46

Viewed 778 times

What would the equivalent nasm would be in windows without using any libraries?

section .text
   global _start

_start:          
   mov  edx,len  
   mov  ecx,msg  
   mov  ebx,1    
   mov  eax,4  
   int  0x80 

   mov  eax,1  
   int  0x80    

section .data
msg db 'Hello, world!', 0xa 
len equ $ - msg

I read that _start is replaced with _main in windows but what about the system call? I found this table but im not sure which register gets what argument:

http://j00ru.vexillium.org/syscalls/nt/32/

Im especially confused about how to understand the system calls in windows because in linux its really clear what to do:

https://syscalls.kernelgrok.com/

The documentation for windows assembly, especially the system calls seems really really poor.

edited Jan 01 '18 at 21:46

ColinE

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asked Jan 01 '18 at 17:38

Asperger

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the name of entry point not play any role here, but `int 0x80` not worked in windows – RbMm Jan 01 '18 at 19:27
@RbMm so what is the right way? – Asperger Jan 01 '18 at 19:35
use windows api – RbMm Jan 01 '18 at 19:36
You question is pretty involved to give a proper answer, so google `nasm windows` and you'll find all kinds of information and examples. – Shift_Left Jan 01 '18 at 19:41
1

@Shift_Left hard to find good info for starters like me but I will try. Thank you : ) – Asperger Jan 01 '18 at 19:46
@Shift_Left is this a good resource? http://www.nasm.us/xdoc/2.13.02/html/nasmdoc0.html – Asperger Jan 01 '18 at 19:47
@Asperger - this not related to nasm at all. this is only tool. you need knowledge about windows system programming – RbMm Jan 01 '18 at 19:49
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@RbMm oh ok. Is it just me or is windows far more complex than linux for assembly starters? – Asperger Jan 01 '18 at 19:51
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This thread has a few good examples of where to start https://stackoverflow.com/questions/1023593/how-to-write-hello-world-in-assembler-under-windows – Shift_Left Jan 02 '18 at 01:16

Printing hello world in nasm windows

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