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; Trap 0 handler (syscall interface).
;
; The trap handler returns the result in r0 and the error code (errno value)
; in r2.  r1 is reserved in case an 8 byte quantity ever needs to be
; returned in registers.

        .text
        .global __trap0
__trap0:
        trap    #0              ; trap 0 returns result in r0, error code in r2
        cmpui   r2,#1           ; is error code zero?
        bc      .Lret           ; yes, skip setting errno
        ld      r4,@(sp)        ; no, set errno
        st      r2,@r4
.Lret:
        jmp     lr              ; return to caller