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

*** 228,237 ****
--- 228,238 ----
  
  /*
   * defined in ucontext.s
   */
  extern int __getcontext(ucontext_t *);
+ extern int __getcontext_extd(ucontext_t *);
  
  /*
   * defined in door.s
   */
  extern int __door_info(int, door_info_t *);
*** 344,353 ****
--- 345,360 ----
  extern size_t mbrtowc_nz_l(wchar_t *_RESTRICT_KYWD, const char *_RESTRICT_KYWD,
      size_t, mbstate_t *_RESTRICT_KYWD, locale_t);
  extern size_t mbrtowc_nz(wchar_t *_RESTRICT_KYWD, const char *_RESTRICT_KYWD,
      size_t, mbstate_t *_RESTRICT_KYWD);
  
+ /*
+  * defined in getauxv.c.
+  */
+ extern long ___getauxval(int);
+ extern void *___getauxptr(int);
+ 
  #ifdef  __cplusplus
  }
  #endif
  
  #endif /* _LIBC_H */