ref: 23f3d33cdbbfdf2f169f1d7c4acf1f947ed5f5c5 dir: /sys/src/cmd/unix/drawterm/posix-sun4u/getcallerpc.c/
#include "u.h" #include "libc.h" ulong getcallerpc(void *a) { return ((ulong*)a)[-1]; }