15254 %ymm registers not restored after signal handler
15367 x86 getfpregs() summons corrupting %xmm ghosts
15333 want x86 /proc xregs support (libc_db, libproc, mdb, etc.)
15336 want libc functions for extended ucontext_t
15334 want ps_lwphandle-specific reg routines
15328 FPU_CW_INIT mistreats reserved bit
15335 i86pc fpu_subr.c isn't really platform-specific
15332 setcontext(2) isn't actually noreturn
15331 need <sys/stdalign.h>
Change-Id: I7060aa86042dfb989f77fc3323c065ea2eafa9ad
Conflicts:
    usr/src/uts/common/fs/proc/prcontrol.c
    usr/src/uts/intel/os/archdep.c
    usr/src/uts/intel/sys/ucontext.h
    usr/src/uts/intel/syscall/getcontext.c

*** 54,63 ****
--- 54,64 ----
  struct lwpsinfo;
  struct prcred;
  struct prpriv;
  struct prsecflags;
  struct prfdinfo;
+ struct prxregset;
  
  struct seg;
  struct regs;
  struct watched_page;
  
*** 75,86 ****
  extern void prgetstatus(proc_t *, struct pstatus *, zone_t *);
  extern void prgetlwpstatus(kthread_t *, struct lwpstatus *, zone_t *);
  extern void prgetpsinfo(proc_t *, struct psinfo *);
  extern void prgetlwpsinfo(kthread_t *, struct lwpsinfo *);
  extern void prgetprfpregs(klwp_t *, struct prfpregset *);
! extern void prgetprxregs(klwp_t *, caddr_t);
! extern int  prgetprxregsize(proc_t *);
  extern void prgetcred(proc_t *, struct prcred *);
  extern void prgetpriv(proc_t *, struct prpriv *);
  extern size_t prgetprivsize(void);
  extern void prgetsecflags(proc_t *, struct prsecflags *);
  extern uint_t prnsegs(struct as *, int);
--- 76,87 ----
  extern void prgetstatus(proc_t *, struct pstatus *, zone_t *);
  extern void prgetlwpstatus(kthread_t *, struct lwpstatus *, zone_t *);
  extern void prgetpsinfo(proc_t *, struct psinfo *);
  extern void prgetlwpsinfo(kthread_t *, struct lwpsinfo *);
  extern void prgetprfpregs(klwp_t *, struct prfpregset *);
! extern void prgetprxregs(klwp_t *, struct prxregset *);
! extern size_t prgetprxregsize(proc_t *);
  extern void prgetcred(proc_t *, struct prcred *);
  extern void prgetpriv(proc_t *, struct prpriv *);
  extern size_t prgetprivsize(void);
  extern void prgetsecflags(proc_t *, struct prsecflags *);
  extern uint_t prnsegs(struct as *, int);