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        comment "subroutine prologue"
        .macro enter
        st r13,@-sp
        .endm

        comment "subroutine epilogue"
        .macro leave
        ld r13,@sp+
        jmp r13
        .endm

        .macro call subr
        bl \subr
        .endm

        .macro several_nops
        nop
        nop
        nop
        nop
        .endm

        comment "exit (0)"
        .macro exit0
        ldi r4, 1
        ldi r0, 0
        trap 15
        .endm