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

          --- old/usr/src/head/stdalign.h
          +++ new/usr/src/head/stdalign.h

   1    1  /*
   2    2   * This file and its contents are supplied under the terms of the

   3    3   * Common Development and Distribution License ("CDDL"), version 1.0.
   4    4   * You may only use this file in accordance with the terms of version
   5    5   * 1.0 of the CDDL.
   6    6   *
   7    7   * A full copy of the text of the CDDL should have accompanied this
   8    8   * source.  A copy of the CDDL is also available via the Internet at
   9    9   * http://www.illumos.org/license/CDDL.
  10   10   */
  11   11  
  12   12  /*
  13      - * Copyright 2016 Joyent, Inc.
  14      - * Copyright 2022 Oxide Computer Company
       13 + * Copyright 2023 Oxide Computer Company
  15   14   */
  16   15  
  17   16  #ifndef _STDALIGN_H
  18   17  #define _STDALIGN_H
  19   18  
  20      -/*
  21      - * ISO/IEC C11 stdalign.h. This header is meant to provide definitions for the
  22      - * alignas and alignof 'keywords' into the underlying compiler-understood value.
  23      - * In addition, there are two macros that are meant to define that this process
  24      - * has happened. C++11 added alignas/alignof as keywords and including this
  25      - * header is meant to cause us to still have the _is_defined macros, but not
  26      - * define this overall.
  27      - *
  28      - * Unlike other cases we don't use any symbol guards here (other than C++) and
  29      - * just allow the implementation to either have _Alignas and _Alignof or not
  30      - * have it and lead to a compiler error for the user. The main justification of
  31      - * this is that this header is only defined in C11 (and newer). It's not defined
  32      - * in other standards and just as if you include a non-standard header, in this
  33      - * case we don't try to stop that (same as if you included something like
  34      - * libdevinfo.h).
  35      - */
       19 +#include <sys/stdalign.h>
  36   20  
  37      -#ifdef __cplusplus
  38      -extern "C" {
  39      -#endif
  40      -
  41      -#ifndef __cplusplus
  42      -
  43      -#define alignas _Alignas
  44      -#define alignof _Alignof
  45      -
  46      -#endif  /* !__cplusplus */
  47      -
  48      -#define __alignas_is_defined    1
  49      -#define __alignof_is_defined    1
  50      -
  51      -#ifdef __cplusplus
  52      -}
  53      -#endif
  54      -
  55   21  #endif /* _STDALIGN_H */
    

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