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        comment "subroutine prologue"
        .macro gdbasm_enter
        stwu    1, -16(1)
        stw     31, 8(1)
        mr      31, 1
        mflr    0
        stw     0, 20(1)
        .endm

        comment "subroutine epilogue"
        .macro gdbasm_leave
        lwz     0, 20(1)
        mtlr    0
        lwz     31, 8(1)
        lwz     1, 0(1)
        blr
        .endm

        .macro gdbasm_call subr
        bl \subr
        .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..."
        li      0, 0
        lwz     0, 0(0)
        .endm

        comment "crt0 startup"
        .macro gdbasm_startup
        .p2align 2
        .endm

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