; File: printf1.asm
;
; Using C printf function to print
;
; Assemble using NASM:  nasm -f elf printf1.asm
;
; C-style main function. 
; Link with gcc:  gcc printf1.o
;

; 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 main
main:
        push    ebp                     ; set up stack frame
        mov     ebp,esp

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

        mov     esp, ebp                ; takedown stack frame
        pop     ebp                     ;   same as "leave" op

        ret