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        .text
        .global __trap0
__trap0:
        trap    0                # trap 0 returns result in r2, error code in r3
        cmpui   r3,1            # is error code zero?
        bc      .Lret           # yes, skip setting errno
        st      r3,@r0          # no, set errno
.Lret:
        jmp     lr              # return to caller