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        comment "subroutine prologue"
        .macro gdbasm_enter
        st r11,@-sp
        st r13,@-sp
        mv r11,sp
        .endm

        comment "subroutine epilogue"
        .macro gdbasm_leave
        add3 sp,r11,0
        ld   r13,@sp+
        ld   r11,@sp+
        jmp  r13
        .endm

        .macro gdbasm_call subr
        bl \subr
        .endm

        .macro gdbasm_several_nops
        nop
        nop
        nop
        nop
        .endm

        comment "exit (0)"
        .macro gdbasm_exit0
        ldi r4, 1
        ldi r0, 0
        trap 15
        .endm

        comment "crt0 startup"
        .macro gdbasm_startup
; R14 always contains memory base address (0)

        ldi     r14,0

; Set the USER and SYSTEM stack pointers.

        ldi     r0, 0           ; zero arguments
        ldi     r1, 0
        mvtc    r0, psw         ; select SPI and set it
        ldi     sp, _stack
        ldi     r10, 0x8000     ; select SPU/FP and set it
        mvtc    r10, psw || ldi r11, 0;  clear stack frame
        ldi     sp, _stack - 0x200
        ldi     r13, 0

        st      r11, @-sp
        st      r13, @-sp
;       mv      r11, sp

        .endm