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Annotation of researchv10no/cmd/PDP11/crt/mcount.s, revision 1.1

1.1     ! root        1: / count subroutine calls during profiling
        !             2: 
        !             3: .globl mcount
        !             4: .comm  countbase,2
        !             5: 
        !             6: mcount:
        !             7:        mov     (r0),r1
        !             8:        bne     1f
        !             9:        mov     countbase,r1
        !            10:        beq     2f
        !            11:        add     $6,countbase
        !            12:        mov     (sp),(r1)+
        !            13:        mov     r1,(r0)
        !            14: 1:
        !            15:        inc     2(r1)
        !            16:        bne     2f
        !            17:        inc     (r1)
        !            18: 2:
        !            19:        rts     pc
        !            20: 

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