_OffsetContextAddr
p = (uint32*)_OffsetContextAddr((addr_t)p);
p = (uint32*)_OffsetContextAddr((addr_t)p);
p = (uint64*)_OffsetContextAddr((addr_t)p);
p = (uint64*)_OffsetContextAddr((addr_t)p);
inline addr_t _OffsetContextAddr(addr_t p);