intfunct_64, Assembly

intfunct_64

; intfunct_64.asm  this is a main function
;                  call integer function  long int sum(long int x, long int y) 
; compile:      nasm -f elf64 -l intfunct_64.lst intfunct_64.asm 
; link:         gcc -m64 -o intfunct_64 intfunct_64.o
; run:          ./intfunct_64 > intfunct_64.out
; view:         cat intfunct_64.out
; result:       5 = sum(2,3)

extern printf
        extern sum
        extern sub
        extern mult
        
        section .data
x:      dq      2
y:      dq      3
fmt:    db      "%ld = sum(%ld,%ld)",10,0

section .bss
z:      resq    1

section .text
        global  main
main:   push    rbp             ; set up stack

mov     rdi, [x]        ; pass arguments for sum
        mov     rsi, [y]
        call    sum             ; in separate file
        mov     [z],rax         ; save result from sum

mov     rdi, fmt        ; print
        mov     rsi, [z]
        mov     rdx, [x]        ; yes, rdx comes before rcx
        mov     rcx, [y]
        mov     rax, 0          ; no float or double
        call    printf

pop     rbp             ; restore stack
        mov     rax,0
        ret
; end main

; end intfunct_64.asm


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