Subversion Repositories eco32

;

; rom09.s -- string output with timing loop

;

; $8  I/O base address

; $9  temporary value

; $10 character

; $11 pointer to string

; $12 timer base address

; $13 timer value

; $31 return address

        .set    oba,0xF0300000

        .set    tba,0xF0000000

        add     $8,$0,oba

        add     $12,$0,tba

        add     $11,$0,hello

loop:

        ldbu    $10,$11,0

stop:

        beq     $10,$0,stop

        jal     out

        add     $11,$11,1

        jal     timing

        j       loop

out:

        stw     $10,$8,12

        jr      $31

timing:

        ldw     $13,$12,8

        sub     $9,$13,0x03C00000

tim1:

        ldw     $13,$12,8

        bgtu    $13,$9,tim1

        jr      $31

hello:

        .byte   "Hello, world!", 0x0D, 0x0A, 0