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        comment "subroutine prologue"
        .macro gdbasm_enter
        std %rp, -16(%sp)
        copy %r3, %r1
        copy %sp, %r3
        std,ma %r1, 128(%sp)
        .endm

        comment "subroutine epilogue"
        .macro gdbasm_leave
        ldd -16(%r3), %rp
        bve (%rp)
        ldd,mb -128(%sp), %r3
        .endm

        .macro gdbasm_call subr
        b,l     \subr , %rp
        nop
        .endm

        .macro gdbasm_several_nops
        nop
        nop
        nop
        nop
        .endm

        comment "exit (0)"
        .macro gdbasm_exit0
        comment "Don't know how to exit, but this will certainly halt..."
        ldw     0(%r0), %r1
        .endm

        comment "crt0 startup"
        .macro gdbasm_startup
        .align 8
        .endm

        comment "Declare a data variable"
        .purgem gdbasm_datavar
        .macro gdbasm_datavar name value
        .data
\name:
        .long   \value
        .endm