; File: double1.asm
;
; Using C printf function to print double values
;

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

        SECTION .data                   ; Data section

msg:    db "Answer: %f", 10, 0          ; The string to print.
pi:     dq 3.14159265


        SECTION .text                   ; Code section.

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

        mov     eax, [pi+4]
        push    eax
        mov     eax, [pi]
        push    eax

        ; Answer should be at the top of the stack
        push    DWORD msg               ; address of ctrl string
        call    printf                  ; Call C function
        add     esp, 12                 ; pop 2 args from stack

        sub     esp, 8
        fld     QWORD [pi]
        fstp    QWORD [esp]

        push    DWORD msg               ; address of ctrl string
        call    printf                  ; Call C function
        add     esp, 12                 ; pop 2 args from stack

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

        ret