ia32_mcontext
ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp,
ia32_set_fpcontext(struct thread *td, struct ia32_mcontext *mcp,
ia32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags)
ia32_set_mcontext(struct thread *td, struct ia32_mcontext *mcp)
struct ia32_mcontext uc_mcontext;
CTASSERT(sizeof(struct ia32_mcontext) == 640);