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

*** 178,190 ****
--- 178,196 ----
                  Lalt_stack.3proc                \
                  Lclearfault.3proc               \
                  Lclearsig.3proc                 \
                  Ldstop.3proc                    \
                  Lgetareg.3proc                  \
+                 Lgetfpregs.3proc                \
+                 Lgetregs.3proc                  \
+                 Lgetxregs.3proc                 \
                  Lmain_stack.3proc               \
                  Lputareg.3proc                  \
+                 Lsetfpregs.3proc                \
+                 Lsetregs.3proc                  \
                  Lsetrun.3proc                   \
+                 Lsetxregs.3proc                 \
                  Lstack.3proc                    \
                  Lstop.3proc                     \
                  Lsync.3proc                     \
                  Lwait.3proc                     \
                  Lxecbkpt.3proc                  \
*** 199,208 ****
--- 205,215 ----
                  Plmid_to_ctf.3proc              \
                  Plmid_to_loadobj.3proc          \
                  Plmid_to_map.3proc              \
                  Plookup_by_name.3proc           \
                  Plwp_alt_stack.3proc            \
+                 Plwp_freexregs.3proc            \
                  Plwp_getfpregs.3proc            \
                  Plwp_iter_all.3proc             \
                  Plwp_main_stack.3proc           \
                  Plwp_setasrs.3proc              \
                  Plwp_setfpregs.3proc            \
*** 353,362 ****
--- 360,373 ----
  Pxlookup_by_name.3proc          := LINKSRC = Plookup_by_addr.3proc
  
  Plwp_setregs.3proc              := LINKSRC = Plwp_getregs.3proc
  Plwp_getfpregs.3proc            := LINKSRC = Plwp_getregs.3proc
  Plwp_setfpregs.3proc            := LINKSRC = Plwp_getregs.3proc
+ Lgetfpregs.3proc                := LINKSRC = Plwp_getregs.3proc
+ Lsetfpregs.3proc                := LINKSRC = Plwp_getregs.3proc
+ Lgetregs.3proc                  := LINKSRC = Plwp_getregs.3proc
+ Lsetregs.3proc                  := LINKSRC = Plwp_getregs.3proc
  
  Plwp_alt_stack.3proc            := LINKSRC = Plwp_stack.3proc
  Plwp_main_stack.3proc           := LINKSRC = Plwp_stack.3proc
  Lalt_stack.3proc                := LINKSRC = Plwp_stack.3proc
  Lmain_stack.3proc               := LINKSRC = Plwp_stack.3proc
*** 429,439 ****
--- 440,453 ----
  proc_str2sigset.3proc           := LINKSRC = proc_str2fltset.3proc
  proc_str2sysset.3proc           := LINKSRC = proc_str2fltset.3proc
  
  proc_get_ldt.3proc              := LINKSRC = Pldt.3proc
  
+ Plwp_freexregs.3proc            := LINKSRC = Plwp_getxregs.3proc
  Plwp_setxregs.3proc             := LINKSRC = Plwp_getxregs.3proc
+ Lgetxregs.3proc                 := LINKSRC = Plwp_getxregs.3proc
+ Lsetxregs.3proc                 := LINKSRC = Plwp_getxregs.3proc
  
  Plwp_setasrs.3proc              := LINKSRC = Plwp_getasrs.3proc
  
  .KEEP_STATE: