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        comment "subroutine prologue"
        .macro gdbasm_enter
        push fp -> push lr
        addi sp,#-4 -> mv fp,sp
        .endm

        comment "subroutine epilogue"
        .macro gdbasm_leave
        addi sp,#4 -> pop lr
        pop fp -> jmp lr
        .endm

        .macro gdbasm_call subr
        bl      \subr
        .endm

        .macro gdbasm_several_nops
        nop
        nop
        nop
        nop
        .endm

        comment "exit (0)"
        .macro gdbasm_exit0
        ldi r0,#1 -> ldi r1,#0
        ldi r2,#0 -> ldi r3,#0
        trap #0 -> nop
        .endm

        comment "crt0 startup"
        .macro gdbasm_startup
        seth sp, #shigh(_stack)
        add3 sp, sp, #low(_stack)
        ldi fp,#0
        .endm