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

*** 54,64 ****
          PS_ERR,         /* generic error */
          PS_BADPID,      /* bad process handle */
          PS_BADLID,      /* bad lwp identifier */
          PS_BADADDR,     /* bad address */
          PS_NOSYM,       /* p_lookup() could not find given symbol */
!         PS_NOFREGS      /* FPU register set not available for given lwp */
  } ps_err_e;
  
  struct ps_prochandle;
  
  /*
--- 54,65 ----
          PS_ERR,         /* generic error */
          PS_BADPID,      /* bad process handle */
          PS_BADLID,      /* bad lwp identifier */
          PS_BADADDR,     /* bad address */
          PS_NOSYM,       /* p_lookup() could not find given symbol */
!         PS_NOFREGS,     /* FPU register set not available for given lwp */
!         PS_NOXREGS      /* extended register set not available for given lwp */
  } ps_err_e;
  
  struct ps_prochandle;
  
  /*
*** 116,130 ****
  extern ps_err_e ps_lgetfpregs(struct ps_prochandle *,
                          lwpid_t, prfpregset_t *);
  extern ps_err_e ps_lsetfpregs(struct ps_prochandle *,
                          lwpid_t, const prfpregset_t *);
  
- #if defined(__sparc) || defined(__sparcv9)
  extern ps_err_e ps_lgetxregsize(struct ps_prochandle *, lwpid_t, int *);
  extern ps_err_e ps_lgetxregs(struct ps_prochandle *, lwpid_t, caddr_t);
  extern ps_err_e ps_lsetxregs(struct ps_prochandle *, lwpid_t, caddr_t);
- #endif
  
  #if defined(__i386) || defined(__amd64)
  extern ps_err_e ps_lgetLDT(struct ps_prochandle *, lwpid_t, struct ssd *);
  #endif
  
--- 117,129 ----