Source Code: hello.s

session14/hello.s 
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        .data
.L0     .string "hello\n"


        .text
        .equ    SP,         1
        loadz   0,          %SP

        call    main,       %2
        halt    0

// function foo
foo:
        subq    8,          %SP,        %SP
        movq    %2,         (%SP)
        // begin of function body

        .equ    p,          2
        .equ    ch,         3
        loadz   .L0,        %p
.while:
        movzbq  (%p),       %ch
        subq    0,          %ch,        %ch
        jz      .done
        putc    %ch
        addq    1,          %p,         %p
        jmp     .while
.done:

        // end of function body
        movq    (%SP),      %2
        addq    8,          %SP,        %SP
        ret     %2

// function main
main:
        subq    8,          %SP,        %SP
        movq    %2,         (%SP)
        // begin of function body

        call    foo,        %2

        // end of function body
        movq    (%SP),      %2
        addq    8,          %SP,        %SP
        ret     %2