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       getcallerpc-PowerMacintosh.c - 9base - revived minimalist port of Plan 9 userland to Unix
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       ---
       getcallerpc-PowerMacintosh.c (79B)
       ---
            1 #include <lib9.h>
            2 
            3 ulong
            4 getcallerpc(void *x)
            5 {
            6         return (((ulong*)(x))[-4]);
            7 }