#include <stddef.h>
#include <sys/ucontext.h>

--
SC_NAT		offsetof (mcontext_t, sc_nat)
SC_BSP		offsetof (mcontext_t, sc_ar_bsp)
SC_RNAT		offsetof (mcontext_t, sc_ar_rnat)
SC_UNAT		offsetof (mcontext_t, sc_ar_unat)
SC_FPSR		offsetof (mcontext_t, sc_ar_fpsr)
SC_PFS		offsetof (mcontext_t, sc_ar_pfs)
SC_LC		offsetof (mcontext_t, sc_ar_lc)
SC_PR		offsetof (mcontext_t, sc_pr)
SC_BR		offsetof (mcontext_t, sc_br)
SC_GR		offsetof (mcontext_t, sc_gr)
SC_FR		offsetof (mcontext_t, sc_fr)
SC_MASK		offsetof (mcontext_t, sc_mask)