BITS 32

jmp short one

two:
 pop ecx
 xor eax, eax
 mov al, 4
 xor ebx, ebx
 inc ebx
 xor edx, edx
 mov dl, 15
 int 0x80

 mov al, 1
 dec ebx
 int 0x80

one:
 call two
 msg db "Hello, world!", 0x0a, 0x0d