M_SEGM_ORIGIN
#define M_SEGM_ORIGIN (Addr)0x400000ULL /* default 1st segment origin */
#define M_SEGM_ORIGIN (Addr)(M_STACK_GAP + M_STACK_PGS)
#define M_SEGM_ORIGIN (Addr)0x100000000ULL /* default 1st segment origin */
#define M_SEGM_ORIGIN (Addr)0x10000 /* default 1st segment origin */