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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