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        comment "subroutine prologue"
        .macro gdbasm_enter
        push r13
        mov r13,r15
        .endm

        comment "subroutine epilogue"
        .macro gdbasm_leave
        pop r13
        ret
        .endm

        .macro gdbasm_call subr
        callf \subr
        .endm

        .macro gdbasm_several_nops
        add r0,#0
        add r0,#0
        add r0,#0
        add r0,#0
        .endm

        comment "exit (0)"
        .macro gdbasm_exit0
        mov.w r2,#0
        halt
        .endm

        comment "crt0 startup"
        .macro gdbasm_startup
        mov r15,#2
        .endm