git: purgatorio

ref: d7809194db6f52a6fc87a6d10bff7e78cc03c4d2
dir: /os/boot/pc/getcallerpc.c/

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#include "u.h"
#include "lib.h"

ulong
getcallerpc(void *x)
{
	return (((ulong*)(x))[-1]);
}