; File: printf2.asm
;
; Using C printf function to print
;
; Assemble using NASM:  nasm -f elf printf2.asm
;
; Assembler style main function. 
; Link with gcc: gcc -nostartfiles printf2.asm
;

%define SYSCALL_EXIT  1

; Declare some external functions
;
        extern printf                   ; the C function, we'll call

        SECTION .data                   ; Data section

msg:    db "Hello, world: %c", 10, 0    ; The string to print.


        SECTION .text                   ; Code section.

        global _start
_start:
        push    dword 97                ; an 'a'
        push    dword msg               ; address of ctrl string
        call    printf                  ; Call C function
        add     esp, 8                  ; pop stack

        mov     eax, SYSCALL_EXIT       ; Exit.
        mov     ebx, 0                  ; exit code, 0=normal
        int     080H                    ; ask kernel to take over