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        comment "subroutine prologue"
        .macro gdbasm_enter
        mov ip, sp
        stmdb sp!, {fp, ip, lr, pc}
        sub fp, ip, #4
        .endm

        comment "subroutine epilogue"
        .macro gdbasm_leave
        ldmea fp, {fp, sp, pc}
        .endm

        .macro gdbasm_call subr
        bl \subr
        .endm

        .macro gdbasm_several_nops
        nop
        nop
        nop
        nop
        .endm

        comment "exit (0)"
        .macro gdbasm_exit0
        mov r0, #0
        swi 0x00123456
        .endm

        comment "crt0 startup"
        .macro gdbasm_startup
        mov sp, #0
        .endm