ref: 332f070e5a51e5fcc1f2f17f15f67aa98a01b5f4 dir: /sys/src/cmd/unix/drawterm/posix-sun4u/getcallerpc.c/
#include "u.h" #include "libc.h" ulong getcallerpc(void *a) { return ((ulong*)a)[-1]; }