Multiply Passed Arguments Together (x86, GAS)

mulall.s

.intel_syntax noprefix
.global main
.format:
        .asciz "%d\n"
main:
        xor rbx, rbx
        inc rbx

        add rsi, 8
        dec rdi
print:
        push rdi
        push rsi
        mov rdi, [rsi]
        call atoi
        mov rcx, rax
        pop rsi
        pop rdi

        imul rbx, rcx

        push rdi
        push rsi
        sub rsp, 8

        mov rdi, OFFSET FLAT: .format
        mov rsi, rbx

        call printf
        add rsp, 8
        pop rsi
        pop rdi

        add rsi, 8
        dec rdi
        jnz print
        
        ret