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/lib/libc/amd64/sys/__getcontext.S
          +++ new/usr/src/lib/libc/amd64/sys/__getcontext.S

   1    1  /*
   2    2   * CDDL HEADER START
   3    3   *
   4    4   * The contents of this file are subject to the terms of the
   5    5   * Common Development and Distribution License (the "License").
   6    6   * You may not use this file except in compliance with the License.
   7    7   *
   8    8   * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9    9   * or http://www.opensolaris.org/os/licensing.
  10   10   * See the License for the specific language governing permissions
  11   11   * and limitations under the License.
  12   12   *
  13   13   * When distributing Covered Code, include this CDDL HEADER in each
  14   14   * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15   15   * If applicable, add the following below this CDDL HEADER, with the
  16   16   * fields enclosed by brackets "[]" replaced with your own identifying

  17   17   * information: Portions Copyright [yyyy] [name of copyright owner]
  18   18   *
  19   19   * CDDL HEADER END
  20   20   */
  21   21  
  22   22  /*
  23   23   * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24   24   * Use is subject to license terms.
  25   25   */
  26   26  
       27 +/*
       28 + * Copyright 2023 Oxide Computer Company
       29 + */
       30 +
  27   31          .file   "__getcontext.s"
  28   32  
  29   33  /*
  30   34   * __getcontext() must be implemented in assembler, as opposed
  31   35   * to the other members of the SYS_context family (see ucontext.c)
  32   36   * because we must be careful to get the precise context of the caller.
  33   37   */
  34   38  
  35   39  #include "SYS.h"
  36   40  
  37   41          ENTRY(__getcontext)
  38   42          movq    %rdi, %rsi
  39   43          movq    $0, %rdi
  40   44          SYSTRAP_RVAL1(context)
  41   45          SYSCERROR
  42   46          RETC
  43   47          SET_SIZE(__getcontext)
       48 +
       49 +        ENTRY(__getcontext_extd)
       50 +        movq    %rdi, %rsi
       51 +        movq    $4, %rdi
       52 +        SYSTRAP_RVAL1(context)
       53 +        SYSCERROR
       54 +        RETC
       55 +        SET_SIZE(__getcontext_extd)
    

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX