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

@@ -200,10 +200,11 @@
                 fstatvfs.2                      \
                 futimes.2                       \
                 futimesat.2                     \
                 futimens.2                      \
                 getaudit_addr.2                 \
+                getcontext_extd.2               \
                 getegid.2                       \
                 geteuid.2                       \
                 getgid.2                        \
                 getpgid.2                       \
                 getpgrp.2                       \

@@ -318,10 +319,11 @@
 setaudit.2                      := LINKSRC = getaudit.2
 setaudit_addr.2                 := LINKSRC = getaudit.2
 
 setauid.2                       := LINKSRC = getauid.2
 
+getcontext_extd.2               := LINKSRC = getcontext.2
 setcontext.2                    := LINKSRC = getcontext.2
 
 setgroups.2                     := LINKSRC = getgroups.2
 
 setitimer.2                     := LINKSRC = getitimer.2