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

*** 27,37 ****
  # Copyright 2015 Igor Kozhukhov <ikozhukhov@gmail.com>
  # Copyright 2017 Nexenta Systems, Inc.
  # Copyright 2016 Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
  # Copyright 2019 Peter Tribble.
  # Copyright 2015, Joyent, Inc. All rights reserved.
! # Copyright 2022 Oxide Computer Company
  #
  
  include $(SRC)/uts/Makefile.uts
  
  FILEMODE=644
--- 27,37 ----
  # Copyright 2015 Igor Kozhukhov <ikozhukhov@gmail.com>
  # Copyright 2017 Nexenta Systems, Inc.
  # Copyright 2016 Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
  # Copyright 2019 Peter Tribble.
  # Copyright 2015, Joyent, Inc. All rights reserved.
! # Copyright 2023 Oxide Computer Company
  #
  
  include $(SRC)/uts/Makefile.uts
  
  FILEMODE=644
*** 549,558 ****
--- 549,559 ----
          srn.h                   \
          sservice.h              \
          stat.h                  \
          statfs.h                \
          statvfs.h               \
+         stdalign.h              \
          stdbool.h               \
          stddef.h                \
          stdint.h                \
          stermio.h               \
          stmf.h                  \